WO2019198571A1

WO2019198571A1 - Air discharge device

Info

Publication number: WO2019198571A1
Application number: PCT/JP2019/014657
Authority: WO
Inventors: 潤山岡; 雅晴酒井; 康彦新美; 隆仁中村; 小松原　祐介; 真梨恵長濱; 康揮大森; 将悟早川; 悟司蛸谷; 侑児岡村; 達哉吉田
Original assignee: 株式会社デンソー
Priority date: 2018-04-11
Filing date: 2019-04-02
Publication date: 2019-10-17

Abstract

An air discharge device (1) equipped with a discharge section (10) for discharging a stream of air. The discharge section includes: a main opening (14) through which an airstream serving as an operating airstream is discharged; an auxiliary opening (22) which is formed at the periphery of the main opening and through which a supporting airstream is discharged; and a swirl suppression structure (180) for suppressing the development of lateral swirls formed inside a velocity boundary layer (BL) of the operating airstream downstream from an outlet of the main opening. The swirl suppression structure is a structure for causing the main flow of the supporting airstream and a center portion (BLc) of the thickness (δ) of the velocity boundary layer of the operating airstream formed downstream from the outlet of the main opening to converge downstream from the outlet of the main opening.

Description

Air blowing device

Cross-reference to related applications

This application includes Japanese Patent Application No. 2018-76325 filed on April 11, 2018, Japanese Patent Application No. 2018-199383 filed on October 23, 2018, and December 25, 2018. Is based on Japanese Patent Application No. 2018-240805 filed in Japan, the contents of which are incorporated herein by reference.

The present disclosure relates to an air blowing device including a blowing unit that blows out an air flow.

2. Description of the Related Art Conventionally, an air nozzle is known in which an auxiliary air outlet is provided around a main hole that forms an air flow serving as a working airflow, and an auxiliary air outlet that forms a support airflow that prevents the air around the main hole being drawn into the working airflow. (For example, refer to Patent Document 1).

JP-A-8-318176

The present inventors diligently studied the air drawing action when the air flow is blown out from the main hole in order to further increase the reach distance of the air flow. As a result, it has been found that the air drawing action is caused by a lateral vortex generated by a shearing force due to the velocity gradient of the working fluid when the working air current is blown from the main hole. The horizontal vortex is a vortex having a vortex center perpendicular to the mainstream flow direction.

As a result of further investigation by the present inventors, in the vicinity of the downstream of the main hole outlet, innumerable transverse vortices generated in the velocity boundary layer are synthesized near the center of the thickness of the velocity boundary layer and developed into a large-scale one. The knowledge that the air drawing-in action becomes stronger was obtained.

However, the above-described conventional technology only discloses providing an auxiliary outlet around the main hole, and does not show any knowledge of the present inventors. For this reason, it is difficult to expect further improvement in the reach of the airflow.

The present disclosure aims to provide an air blowing device that can increase the reach of the working air flow blown from the main hole.

According to one aspect of the present disclosure, the air blowing device includes a blowing unit that blows out an air flow. The blow-out unit has at least one main hole that blows out an air flow that is a working air flow, and at least one main air that blows out a support air flow that is formed around the main hole and suppresses air drawing action by the working air flow blown out of the main hole. And an auxiliary hole. Moreover, the blow-out part includes a vortex suppressing structure that suppresses the development of a lateral vortex formed in the velocity boundary layer of the working airflow downstream of the outlet of the main hole. The vortex suppression structure has a structure in which the central part of the thickness of the velocity boundary layer of the working airflow formed downstream of the outlet of the main hole and the mainstream of the support airflow are brought closer to the downstream of the outlet of the main hole.
In this way, if the configuration is such that the main part of the support airflow blown out from the auxiliary hole and the central part of the thickness of the velocity boundary layer formed downstream of the main hole and the auxiliary hole, the speed boundary is generated by the support airflow blown out from the auxiliary hole. Development of transverse vortices in the layer is sufficiently suppressed. As a result, the drawing of air from the surroundings into the working airflow blown out from the main hole is suppressed, and the attenuation of the flow velocity of the working airflow blown out from the main hole is reduced. The reach is longer.

By the way, when there is a corner at the opening edge of the main hole, the horizontal vortex tends to easily develop into a large scale at the corner. This is not preferable because it causes a reduction in the reach of the working airflow blown from the mainstream.
According to another viewpoint of this indication, an air blowing device is provided with a blowing part which blows off air current. The blowout part includes at least one main hole that blows out an airflow serving as a working airflow. The main hole has a plurality of edges that form the opening edge of the main hole. The plurality of edges are connected so that edges having different curvatures are adjacent to each other, and connecting portions of the adjacent edges are rounded.
According to this, since the connection part of each edge part which is a change point of the curvature in the opening edge of a main hole has roundness, a main hole becomes an opening shape without a corner | angular part. As a result, the development of the lateral vortex near the outlet downstream of the main hole is sufficiently suppressed, so that the reach of the working air current blown out from the main flow can be increased.
Here, “connected so that the connecting portions of the adjacent edge portions are rounded” can be interpreted as a state in which the tangents at the connecting portions of the adjacent edge portions are connected to each other.
Reference numerals in parentheses attached to each component and the like indicate an example of a correspondence relationship between the component and the like and specific components described in the embodiments described later.

It is a typical perspective view of the air blowing apparatus which concerns on 1st Embodiment. It is a typical front view of the air blowing apparatus which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. It is explanatory drawing for demonstrating the velocity gradient of the airflow in the exit downstream of the 1st nozzle used as the 1st comparative example. It is explanatory drawing for demonstrating the state of the airflow in the exit downstream of the 1st nozzle used as the 1st comparative example. It is explanatory drawing for demonstrating the velocity gradient of the airflow in the exit downstream of the 2nd nozzle used as the 2nd comparative example. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the state of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 1st Embodiment. It is a typical perspective view of the air blowing apparatus which concerns on 2nd Embodiment. It is a typical front view of the air blowing apparatus which concerns on 2nd Embodiment. It is XI-XI sectional drawing of FIG. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 2nd Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 3rd Embodiment. It is an enlarged view of the XIV part of FIG. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 3rd Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 4th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working airflow downstream of the exit of the main hole of the air blowing apparatus which concerns on 4th Embodiment. It is explanatory drawing for demonstrating the state of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 4th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 5th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 5th Embodiment. It is explanatory drawing for demonstrating the state of the working airflow in the outlet downstream of the main hole of the air blowing apparatus which concerns on 5th Embodiment. It is a typical front view of the air blowing apparatus which concerns on 6th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 6th Embodiment. It is explanatory drawing for demonstrating the relationship between the working airflow in the exit downstream of the main hole of the air blowing apparatus which concerns on 6th Embodiment, and a support airflow. It is explanatory drawing for demonstrating the state of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 6th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 7th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 8th Embodiment. It is a typical top view of the vertical vortex generating mechanism added to the air blowing apparatus which concerns on 9th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 9th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 10th Embodiment. It is a typical perspective view of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the opening shape of the main hole of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 1st modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 2nd modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 3rd modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 4th modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 5th modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 6th modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 7th modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 8th modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 9th modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 10th modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 11th modification of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the main hole used as the 12th modification of the air blowing apparatus which concerns on 11th Embodiment. It is a typical perspective view of the air blowing apparatus which concerns on 12th Embodiment. It is explanatory drawing for demonstrating the shape of the main hole vicinity of the air blowing apparatus which concerns on 12th Embodiment. It is explanatory drawing for demonstrating the main hole used as the modification of the air blowing apparatus which concerns on 12th Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same or equivalent parts as those described in the preceding embodiments are denoted by the same reference numerals, and the description thereof may be omitted. Further, in the embodiment, when only a part of the constituent elements are described, the constituent elements described in the preceding embodiment can be applied to the other parts of the constituent elements. The following embodiments can be partially combined with each other even if they are not particularly specified as long as they do not cause any trouble in the combination.

(First embodiment)
This embodiment will be described with reference to FIGS. The air blowing device 1 of this embodiment is applied to an air outlet of an air conditioning unit that air-conditions a vehicle interior. Although not shown, the air conditioning unit is disposed inside an instrument panel provided in the foremost part of the vehicle interior. And the air blower outlet of an air-conditioning unit is provided in the instrument panel and its inner side.

As shown in FIGS. 1 and 2, the air blowing device 1 includes a blowing unit 10 that blows out an air flow. The blow-out unit 10 is formed with an air flow path for guiding an air flow adjusted to a desired temperature by the air conditioning unit into the room. The blowing part 10 includes a duct part 16, a hole forming part 12 that forms a main hole 14 that blows out an airflow that serves as a working airflow, and a flange part 20 that is provided outside the duct part 16.

The duct portion 16 is a member that forms a flow path through which an airflow blown into the room is passed. The duct part 16 is comprised with the cylindrical member. The shape of the duct portion 16 as viewed from the air flow direction is a flat shape having a horizontal width larger than the vertical width. Further, the duct portion 16 has a shape in which the shape along the air flow direction is narrowed from the air flow upstream side to the downstream side.

As shown in FIG. 3, a partition portion 26 is provided in the duct portion 16 near the downstream portion than the upstream portion. The partition portion 26 is configured in a cylindrical shape, and is arranged inside the duct portion 16 so as to have a predetermined gap with respect to the duct portion 16. Inside the duct portion 16, an inner flow path and an outer flow path are formed by the partition portion 26. That is, the duct part 16 has a double flow path structure by arranging the partition part 26 on the inside thereof.

The main flow path 18 is formed in the center part inside the duct part 16. The main flow path 18 is configured by a space inside the partition portion 26. The main flow path 18 is a flow path through which a working air current blown from a main hole 14 described later passes.

Further, an auxiliary flow path 24 is formed inside the duct portion 16 at the outer portion of the main flow path 18. The auxiliary flow path 24 is configured by a gap formed between the partition portion 26 and the duct portion 16. The auxiliary flow path 24 is a flow path through which the support airflow blown out from the auxiliary hole 22 passes.

The main flow path 18 and the auxiliary flow path 24 are partitioned by the partition portion 26 described above. The main flow path 18 and the auxiliary flow path 24 communicate with each other at a portion of the duct portion 16 that is located on the upstream side of the upstream end portion of the partition portion 26.

The duct part 16 is fitted into an air outlet of an air conditioning unit (not shown) on the upstream side of the air flow. Further, the duct portion 16 is connected to the outer periphery of the hole forming portion 12 at the downstream side of the air flow.

The hole forming part 12 is positioned at the end of the duct part 16 on the downstream side of the air flow. The hole forming portion 12 is a plate-like member that constitutes an end surface of the duct portion 16 on the downstream side of the air flow, and has a predetermined thickness in the air flow direction. The hole forming part 12 is also a connection part that connects the duct part 16 and the partition part 26. The hole formation part 12 is comprised by the cylinder shape so that air can be blown out. The shape of the hole forming portion 12 as viewed from the air flow direction is a flat shape whose horizontal width is larger than the vertical width. The hole forming portion 12 has a main hole 14 opened as a single hole at the center thereof. The main hole 14 is an opening for blowing out the conditioned air whose temperature is adjusted by the air conditioning unit as a working air flow into the vehicle interior.

The shape of the main hole 14 as viewed from the air flow direction is an oval shape whose horizontal width is larger than vertical width. Specifically, the main hole 14 has a shape formed by connecting parallel line segments of equal length with a pair of curved curves.

The main hole 14 is a hole connected to the main flow path 18. The main hole 14 is formed in the partition 26 in a range located upstream from the end on the downstream side of the air flow by the thickness of the hole forming part 12. The main hole 14 has an inner wall surface 141 extending along the air flow direction.

Further, a plurality of auxiliary holes 22 are formed in the hole forming portion 12 so as to surround the periphery of the main hole 14. The auxiliary hole 22 is an opening for blowing out a support airflow for suppressing the air drawing action by the working airflow blown out from the main hole 14.

2, the plurality of auxiliary holes 22 are formed so as to surround the main hole 14 in the hole forming portion 12. The plurality of auxiliary holes 22 are formed outside the portion of the hole forming portion 12 that forms the outer edge portion of the main hole 14. The plurality of auxiliary holes 22 are formed so that the intervals between them are equal. The plurality of auxiliary holes 22 are formed as round holes having a smaller cross-sectional area than the main hole 14.

The auxiliary hole 22 is a hole that continues to the auxiliary flow path 24. The auxiliary hole 22 is formed in a range of the partition portion 26 and the duct portion 16 that is located upstream from the end on the downstream side of the air flow by the thickness of the hole forming portion 12. The auxiliary hole 22 has an inner wall surface 221 that extends along the air flow direction.

The flange part 20 is a member for attaching the blowing part 10 to an instrument panel (not shown). The flange portion 20 is composed of a rectangular member provided so as to protrude from the duct portion 16 with respect to the outer periphery of the duct portion 16. The flange portion 20 is attached to the instrument panel by a connecting member such as a screw in a state where the upstream portion of the duct portion 16 is fitted to the air outlet of the air conditioning unit. The flange portion 20 is formed with through holes 201 through which connecting members such as screws are passed in the vicinity of the four corners forming the corner portions.

Each of the hole forming part 12, the duct part 16, the flange part 20, and the partition part 26 constituting the blowing part 10 is made of resin. The hole forming part 12, the duct part 16, the flange part 20, and the partition part 26 are formed of an integrally molded product that is integrally formed by a molding technique such as injection molding. In addition, the hole formation part 12, the duct part 16, the flange part 20, and the partition part 26 may be comprised by the part separately. As described above, the blowing unit 10 configured in this manner is installed on an instrument panel (not shown).

Here, in recent years, instrument panels have been required to be thin in the vertical direction of the vehicle from the viewpoint of expansion of the passenger compartment and design. In addition, the instrument panel tends to be provided with a large information device for notifying various information indicating the driving state of the vehicle at a central portion in the vehicle width direction or a portion facing the occupant in the vehicle longitudinal direction. As a result, the air conditioning unit requires measures such as making the air outlet thin, but if the air outlet is made thin, it blows out from the air outlet due to the lateral vortex Vt generated downstream of the air outlet. The collapse of the core portion of the airflow is accelerated, and the reach distance of the airflow in the passenger compartment is shortened. For this reason, the air blowing device 1 is required to increase the reach of the airflow blown into the vehicle interior.

In order to further increase the reach of the airflow blown into the vehicle interior, the present inventors diligently studied the air drawing action when the airflow was blown out from the main hole 14. As a result, it has been found that the air drawing action is caused by the lateral vortex Vt generated by the shearing force due to the velocity gradient of the working air flow when the working air flow is blown out from the main hole 14. Hereinafter, the air drawing action will be described with reference to FIGS. 4 and 5.

FIG. 4 is a schematic diagram showing a first nozzle CE1 that is a first comparative example of the air blowing device 1 of the present embodiment. The first nozzle CE1 is formed of a cylindrical tube having a substantially constant cross-sectional area, and the opening on one end side forms the main hole Hm1.

As shown in FIG. 4, when the air flow is blown out from the main hole Hm1 of the first nozzle CE1, it is caused by the difference in velocity between the air flow from the main hole Hm1 and the air stationary around it at the outlet downstream of the main hole Hm1. Thus, the velocity boundary layer BL is formed. The velocity boundary layer BL is a layer that is affected by stationary air among the airflows blown from the main hole Hm1 of the first nozzle CE1.

In the velocity boundary layer BL, as shown in FIG. 5, innumerable transverse vortices Vt are generated by the shearing force due to the velocity gradient. According to the study by the present inventors, innumerable transverse vortices Vt generated in the velocity boundary layer BL are synthesized in the vicinity of the central portion BLc of the thickness δ of the velocity boundary layer BL and developed into a large-scale one. It was found that the air drawing action tends to be stronger.

Here, the thickness δ of the velocity boundary layer BL reaches a position where it becomes 99% (that is, 0.99 × U _∞ ) of the velocity U _∞ of the main flow (that is, potential flow) that flows outside the velocity boundary layer BL from the wall surface. Is defined as the length of The thickness δ of the velocity boundary layer BL is calculated based on the following formula F1, for example.

δ = 5 × (ν × x / U _∞ ) ^1/2 (F1)
However, in Formula F1, ν represents a kinematic viscosity coefficient, x represents a position in the main flow direction, and U _∞ represents a main flow speed (that is, a uniform flow speed). As the definition formula of the thickness δ of the velocity boundary layer BL, in addition to the formula F1 described above, for example, a definition formula based on the excluded thickness or a definition formula based on the momentum thickness can be used.

FIG. 6 is a schematic diagram showing a second nozzle CE2 which is a second comparative example of the air blowing device 1 of the present embodiment. The second nozzle CE2 is configured by a cylindrical tube in which a main hole Hm2 and a plurality of auxiliary holes Hs surrounding the main hole Hm2 are formed on one end side thereof. As shown in FIG. 6, when an air flow is blown out from the main hole Hm2 and the auxiliary hole Hs of the second nozzle CE2, the velocity boundary layer BL of the working air flow along the inner wall surface of the main hole Hm2 downstream of the main hole Hm2. Is formed. In the velocity boundary layer BL, it is considered that the lateral vortex Vt is likely to occur near the central portion BLc of the thickness δ.

On the other hand, the main flow of the support airflow blown out from the auxiliary hole Hs is blown out in parallel with the working airflow from the main hole Hm2 in a state where there is a predetermined interval LS from the central portion BLc of the thickness δ of the velocity boundary layer BL. . That is, in the second nozzle CE2, the mainstream AFs of the support airflow blown out from the auxiliary hole Hs flows away from the center portion BLc of the thickness δ of the velocity boundary layer BL.

In such a case, the main flow of the support airflow is separated from the vortex center of the horizontal vortex Vt generated in the velocity boundary layer BL, the horizontal vortex Vt is not easily broken by the support airflow, and the development of the lateral vortex Vt generated in the velocity boundary layer BL It is considered that the suppression effect is difficult to obtain.

The inventors of the present invention can suppress the development of the lateral vortex Vt generated in the velocity boundary layer BL by bringing the main flow of the support airflow close to the vortex of the lateral vortex Vt generated in the velocity boundary layer BL of the working airflow. In consideration, the vortex suppressing structure is added to the blowing portion 10.

As shown in FIG. 3, the blowout portion 10 of the present embodiment has an enlarged portion in which the cross-sectional area Sc is larger than the opening area Sm of the main hole 14 with respect to the main flow path 18 of the duct portion 16 as a vortex suppression structure. 180 is provided.

The inner wall surface 181 of the partition portion 26 that forms the main flow path 18 has a shape in which the wall surface shape tapers from the portion having the largest cross-sectional area in the enlarged portion 180 toward the main hole 14. The enlarged portion 180 is configured by a portion of the inner wall surface 181 of the partition portion 26 that forms the main flow path 18 that has a cross-sectional area that decreases from the air flow upstream side to the downstream side. In other words, the cross-sectional area of the enlarged portion 180 is continuously reduced as it approaches the main hole 14 so as to be continuously connected to the main hole 14. The enlarged portion 180 is set so that the ratio between the maximum cross-sectional area Sc and the opening area Sm of the main hole 14 is, for example, 7 to 2. The cross-sectional area Sc of the enlarged portion 180 is a cross-sectional area at a portion where the flow path cross-sectional area is the largest in the main flow path 18. Specifically, the cross-sectional area Sc of the enlarged portion 180 is a cross-sectional area at the end of the partition portion 26 on the upstream side of the air flow. The opening area Sm of the main hole 14 is a cross-sectional area at the end of the partitioning portion 26 on the downstream side of the air flow.

As shown in FIG. 7, in the blowout portion 10 of the present embodiment configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct portion 16, the conditioned air is passed through the main channel 18 through the main hole 18. It flows toward 14.

The main flow path 18 is provided with an enlarged portion 180 having a cross-sectional area Sc larger than the opening area Sm of the main hole 14, so that contraction occurs from the enlarged portion 180 to the main hole 14. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced. The reason why the flow velocity of the air flow near the inner wall surface 181 forming the main flow path 18 is increased is that centrifugal force acts on the air flow along the wall surface by the action of the curvature of the inner wall surface 181 forming the main flow path 18. The contracted flow is a phenomenon in which the difference between the flow velocity near the flow channel wall surface of the air flow and the flow velocity of the main flow is reduced by reducing the cross section of the flow channel.

Then, when the airflow is blown out from the main hole 14 and the auxiliary hole 22, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. The thickness δ of the velocity boundary layer BL is smaller than that of the second comparative example due to contraction of the main flow path 18.

When the thickness δ of the velocity boundary layer BL of the working airflow formed downstream from the outlet of the main hole 14 is small, the main portion of the support airflow blown out from the center portion BLc of the thickness δ of the velocity boundary layer BL and the auxiliary hole 22 is mainly used. It will be in the state which approaches at the exit downstream of the hole 14. That is, in the blowout portion 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state of approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. Specifically, the interval LS between the main flow of the support airflow and the central portion BLc of the thickness δ of the velocity boundary layer BL is smaller than that in the second comparative example.

In this case, as shown in FIG. 8, the main flow of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, and the transverse vortex Vt is easily collapsed by the support airflow. The effect of suppressing the development of the lateral vortex Vt that occurs in the velocity boundary layer BL downstream of the outlet of the gas can be easily obtained.

As described above, in the air blowing device 1 according to the present embodiment, the development of the lateral vortex Vt generated in the velocity boundary layer BL downstream of the outlet of the main hole 14 can be suppressed by the enlarged portion 180 provided in the main flow path 18. In the present embodiment, the enlarged portion 180 provided in the main channel 18 functions as a vortex suppression structure. More specifically, the enlarged portion 180 functions as a layer reduction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

In the air blowing device 1 described above, a vortex suppression structure is realized by the enlarged portion 180 provided in the main flow path 18. According to this, the airflow blown out from the central part BLc of the thickness boundary δ of the velocity boundary layer BL formed at the outlet downstream of the main hole 14 and the auxiliary hole 22 approaches downstream of the outlet of the main hole 14. That is, if the main flow path 18 is provided with the enlarged portion 180, the flow velocity difference between the center line CLm of the main hole 14 and the vicinity of the inner wall surface 141 is reduced due to contraction in the vicinity of the main hole 14. The thickness δ of the velocity boundary layer BL formed downstream from the outlet of the main hole 14 can be reduced.

Thereby, the development of the transverse vortex Vt in the velocity boundary layer BL is sufficiently suppressed by the support airflow blown out from the auxiliary hole 22. As a result, the drawing of air from the surroundings to the working airflow blown out from the main hole 14 is suppressed, and the flow velocity of the working airflow blown out from the main hole 14 is less attenuated. The reach of the air current becomes longer.

In particular, when air-conditioned air whose temperature has been adjusted by the air-conditioning unit is blown out from the main hole 14 as a working airflow, air drawing from the surroundings is suppressed to the working airflow blown out from the main hole 14, so that air can be drawn in. The temperature change of the working airflow resulting from it can be suppressed. That is, according to the air blowing device 1 of the present embodiment, an airflow having an appropriate temperature can reach a desired location. This is particularly effective in realizing spot-like air conditioning in the passenger compartment.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. The present embodiment is different from the first embodiment in that the reduced flow fins 28 for reducing the airflow flowing through the main flow path 18 are provided inside the duct portion 16. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 9, the blowing portion 10 of the present embodiment is provided with a contracted fin 28 inside the duct portion 16. As shown in FIG. 10, the contraction fin 28 is formed at a substantially central portion of the short side of the inner wall surface 141 of the main hole 14 so that the main flow path 18 formed inside the duct portion 16 is vertically divided. The main hole 14 extends along the long side of the inner wall surface 141. Although not shown, the contracted fins 28 are connected to the inside of the duct portion 16 at both ends in the longitudinal direction.

As shown in FIG. 11, the contracted fins 28 are positioned at a portion where the main flow path 18 inside the duct portion 16 is formed so as not to protrude from the main hole 14. Specifically, the contracted fin 28 is a position that overlaps a part of the partition portion 26 in the direction perpendicular to the center line CLm of the main flow path 18 within the duct portion 16, and is inside the main hole 14. It is arranged at a position that does not overlap the wall surface 141.

Also, the contracted fin 28 has a teardrop shape with a cross section having excellent aerodynamic characteristics. In other words, the contracted fin 28 has a curved surface with a rounded front edge portion on the upstream side of the air flow, and a sharp curved surface on the downstream edge of the downstream side of the air flow as compared with the front edge portion. Further, the contraction fin 28 has a maximum cross-sectional thickness at a position closer to the front edge portion than to the rear edge portion.

In the blowing unit 10 of the present embodiment configured as described above, as shown in FIG. 12, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air flows through the main channel 18 through the main hole 18. It flows toward 14.

The main flow path 18 is provided with an enlarged portion 180 having a cross-sectional area Sc larger than the opening area Sm of the main hole 14. For this reason, a contracted flow occurs from the enlarged portion 180 to the main hole 14. In addition, the main flow path 18 is bifurcated by the reduced flow fins 28, so that a reduced flow is generated before reaching the main hole 14.

As described above, the contraction fin 28 is positioned at a portion where the main flow path 18 inside the duct portion 16 is formed so as not to protrude from the main hole 14. For this reason, on the inner side of the duct portion 16, the upstream section A in which the channel cross-sectional area is reduced by the contraction fin 28, the intermediate section B in which the channel cross-sectional area is larger than the upstream section A, and the channel cross-sectional area are almost changed. A downstream section C is formed.

In the upstream section A, the flow cross-sectional area is reduced by the contracted fins 28 and the airflow is compressed, whereby the flow velocity between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 that forms the main flow path 18. The difference is sufficiently small. That is, in the upstream section A, the thickness δ of the velocity boundary layer BL in the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced toward the downstream side due to the contraction effect by the contraction fins 28.

On the other hand, in the intermediate section B and the downstream section C, which are downstream of the upstream section A, the flow path cross-sectional area is not small, so the thickness δ of the velocity boundary layer BL near the inner wall surface 181 forming the main flow path 18 is downstream. Grows toward the side.

Specifically, in the intermediate section B, since the cross-sectional area of the flow path is enlarged, the thickness δ of the velocity boundary layer BL near the inner wall surface 181 forming the main flow path 18 gradually increases toward the downstream side. However, in the contracted fin 28, the amount of change in the thickness of the cross section on the trailing edge side on the downstream side of the air flow is smaller than that on the leading edge side. For this reason, the change in the channel cross-sectional area in the intermediate section B becomes gentler than the change in the upstream section A, and the increase amount of the thickness δ of the speed boundary layer BL in the intermediate section B is the speed boundary layer BL in the upstream section A. This is sufficiently smaller than the reduction amount of the thickness δ. Further, in the downstream section C, which is downstream of the intermediate section B, the flow path cross-sectional area is constant, so the thickness δ of the velocity boundary layer BL near the inner wall surface 181 forming the main flow path 18 is slightly lower toward the downstream side. growing. However, the increase amount of the thickness δ of the velocity boundary layer BL in the downstream section C is extremely smaller than the decrease amount of the thickness δ of the velocity boundary layer BL in the upstream section A.

As described above, the amount of decrease in the thickness δ of the velocity boundary layer BL in the upstream section A by the contraction fin 28 is sufficiently larger than the increase in the thickness δ of the velocity boundary layer BL in the intermediate section B and the downstream section C. .

Thereby, in the main flow path 18, the difference in flow velocity between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 becomes sufficiently small. When the airflow is blown out from the main hole 14 and the auxiliary hole 22, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. The thickness δ of the speed boundary layer BL is smaller than that in the first embodiment.

For this reason, in the blowing portion 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state of approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. As a result, the main flow of the support airflow flows in the vicinity of the vortex center of the horizontal vortex Vt generated in the velocity boundary layer BL. Therefore, the horizontal vortex Vt is collapsed by the support airflow and is generated in the velocity boundary layer BL downstream of the outlet of the main hole 14. The effect of suppressing the development of the lateral vortex Vt is easily obtained. In the present embodiment, the enlarged portion 180 and the contracted fin 28 provided in the main channel 18 function as a vortex suppressing structure. More specifically, each of the enlarged portion 180 and the contracted fin 28 functions as a layer reducing structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

The air blowing device 1 of the present embodiment described above has the same configuration as that of the first embodiment, although the contracted fins 28 are added to the main flow path 18. For this reason, the air blowing apparatus 1 of this embodiment can obtain the effect obtained from a structure common to 1st Embodiment similarly to 1st Embodiment.

In particular, in this embodiment, the layer contraction structure includes not only the enlarged portion 180 but also the contraction fins 28. According to this, it is possible to reduce the thickness δ of the velocity boundary layer BL due to contraction while suppressing an increase in the size of the apparatus due to the expansion of the main flow path 18. Such a configuration is suitable when the installation space is greatly limited like a moving body such as a vehicle.

(Modification of the second embodiment)
In the above-described second embodiment, the contracted fins 28 are exemplified with the cross-sectional shape being a teardrop shape, but are not limited thereto. For example, the contracted fins 28 may have an oval cross-sectional shape extending along the airflow of the main flow path 18. Moreover, as the contraction fin 28, what has a grid | lattice shape may be employ | adopted, for example.

In the second embodiment described above, the example in which the enlarged portion 180 is provided with respect to the main flow path 18 has been described, but the present invention is not limited to this. The air blowing device 1 may be configured such that only the contracted fins 28 are arranged with respect to the main flow path 18 and the enlarged portion 180 is not provided with respect to the main flow path 18. In this case, the contraction fins 28 function as a layer contraction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. The present embodiment is different from the first embodiment in that the uneven portion 30 is provided on the inner wall surface 181 that forms the main flow path 18. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 13, in the blowing portion 10 of the present embodiment, the concave portions and the convex portions are alternately arranged along the flow direction of the air flow in the main flow path 18 with respect to the inner wall surface 181 that forms the main flow path 18. An uneven portion 30 is provided. Specifically, the concavo-convex portion 30 is formed in substantially the entire area inside the partition portion 26 that partitions the main flow path 18 and the auxiliary flow path 24 inside the duct portion 16.

As shown in FIG. 14, the concavo-convex portion 30 is formed by a plurality of grooves 301 provided on the inner wall surface 181 that forms the main flow path 18. The plurality of grooves 301 are formed so as to be arranged at predetermined intervals along the airflow direction in the main flow path 18. The groove 301 is configured by a circular or polygonal depression. In addition, the groove | channel 301 may be comprised by the slit groove | channel where the cross section which cross | intersects the flow direction of the airflow in the main flow path 18 is V-shaped, for example.

In the blowing unit 10 of the present embodiment configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16 as shown in FIG. It flows toward 14.

The main flow path 18 is provided with an enlarged portion 180 having a cross-sectional area Sc larger than the opening area Sm of the main hole 14, so that contraction occurs from the enlarged portion 180 to the main hole 14. In addition, the inner wall surface 181 that forms the main flow path 18 is formed with a concavo-convex part 30 in which concave parts and convex parts are alternately arranged in the main flow direction in the main flow path 18.

As shown in FIG. 14, in the concavo-convex portion 30, vortices are generated in the plurality of grooves 301 when the airflow passes near the inner wall surface 181 that forms the main flow path 18. And the vortex which arises inside the uneven | corrugated | grooved part 30 plays a role like a ball bearing, and the friction coefficient of the inner wall surface 181 which forms the main flow path 18 becomes small. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced.

Then, when the airflow is blown out from the main hole 14 and the auxiliary hole 22, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. The thickness δ of the speed boundary layer BL is smaller than that of the first embodiment due to the effect of reducing the friction coefficient by the uneven portion 30.

For this reason, in the blowing portion 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. Specifically, the distance LS between the main flow of the support airflow and the central portion BLc of the thickness δ of the velocity boundary layer BL is smaller than that in the first embodiment. As a result, the main flow of the support airflow flows in the vicinity of the vortex center of the horizontal vortex Vt generated in the velocity boundary layer BL. Therefore, the horizontal vortex Vt is collapsed by the support airflow and is generated in the velocity boundary layer BL downstream of the outlet of the main hole 14. The effect of suppressing the development of the lateral vortex Vt is easily obtained. In the present embodiment, the enlarged portion 180 and the concavo-convex portion 30 provided in the main channel 18 function as a vortex suppressing structure. More specifically, each of the enlarged portion 180 and the concavo-convex portion 30 functions as a layer reduction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

In the air blowing device 1 of the present embodiment described above, the uneven portion 30 is added to the inner wall surface 181 that forms the main flow path 18, but other configurations are common to the first embodiment. For this reason, the air blowing apparatus 1 of this embodiment can obtain the effect obtained from a structure common to 1st Embodiment similarly to 1st Embodiment.

In the present embodiment, the layer reduction structure includes not only the enlarged portion 180 but also the uneven portion 30. Accordingly, the thickness δ of the velocity boundary layer BL can be made sufficiently small by the effect of reducing the friction coefficient of the inner wall surface 181 forming the main flow path 18 as well as the contraction effect by the enlarged portion 180. .

In particular, in this embodiment, the uneven portion 30 is formed by a plurality of grooves 301 provided on the inner wall surface 181 of the main flow path 18. According to this, compared with the case where the uneven | corrugated | grooved part 30 is comprised with a some protrusion, the magnitude | size of the main flow path 18 can be ensured and the pressure loss in the main flow path 18 can be suppressed. This greatly contributes to the improvement of the reach of the working airflow.

(Modification of the third embodiment)
In the third embodiment described above, the concavo-convex portion 30 is illustrated as being formed by the plurality of grooves 301, but is not limited thereto. The uneven part 30 may be formed by a plurality of protrusions, for example. When the concavo-convex portion 30 is formed by a plurality of protrusions, vortices are generated in the gaps between the plurality of protrusions when the airflow passes near the inner wall surface 181 forming the main flow path 18. Since this vortex plays a role like a ball bearing, the effect similar to the above-mentioned third embodiment can be obtained by this modification.

In the third embodiment described above, the concavo-convex portion 30 is illustrated as being formed in substantially the entire area inside the partition portion 26 that partitions the main flow path 18 and the auxiliary flow path 24 inside the duct portion 16. It is not limited. The uneven portion 30 may be formed on a part of the inside of the partition portion 26.

In the above-described third embodiment, the example in which the enlarged portion 180 is provided with respect to the main flow path 18 has been described, but the present invention is not limited to this. The air blowing device 1 may have a configuration in which the concavo-convex portion 30 is only disposed with respect to the main flow path 18 and the enlarged portion 180 is not provided with respect to the main flow path 18. In this case, the concavo-convex portion 30 functions as a layer reduction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

In the above-described third embodiment, the structure including the enlarged portion 180 and the concavo-convex portion 30 is exemplified as the layer reduction structure, but the present invention is not limited to this. The layer contraction structure may be, for example, a structure including the enlarged portion 180, the contracted fin 28 and the uneven portion 30, or a structure including the contracted fin 28 and the uneven portion 30.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. The present embodiment is different from the first embodiment in that the main hole 14 is expanded in a trumpet shape. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 16, the blowout portion 10 of the present embodiment has the main hole 14 expanded in a trumpet shape. Specifically, the auxiliary hole is formed on the inner wall surface 141 of the main hole 14 such that a tangent line TLm extending along the inner wall surface 141 of the main hole 14 intersects the center line CLs of the auxiliary hole 22 downstream of the auxiliary hole 22. A main inclined structure 32 that is inclined with respect to the center line CLs of 22 is provided. In other words, the inner wall surface 141 of the main hole 14 is inclined so that the tangent line TLm extending along the inner wall surface 141 intersects the center line CLm of the main hole 14 on the entire circumference. Specifically, the tangent line TLm is a tangent line that extends along the inner wall surface 141 at the downstream end of the inner wall surface 141 of the main hole 14.

Here, in the velocity boundary layer BL formed downstream from the outlet of the main hole 14, there is a tendency that the lateral vortex Vt starts to occur not at the position immediately after the main hole 14 but at a position away from the main hole 14. For example, the horizontal vortex Vt may begin to occur at a position separated by more than twice the minor axis of the main hole 14. Therefore, the inner wall surface 141 of the main hole 14 is desirably set within a range where the angle θm formed between the tangent line TLm and the center line CLs is an acute angle (for example, within a range of 1 ° to 30 °).

Further, in the blowing part 10 of the present embodiment, the cross-sectional area Sc of the main flow path 18 is smaller than the opening area Sm of the main hole 14. That is, the blowing unit 10 of the present embodiment is not provided with a configuration corresponding to the expansion unit 180 of the first embodiment. Note that the cross-sectional area Sc of the main flow path 18 is a cross-sectional area at an end portion on the upstream side of the partition portion 26.

In the blowing unit 10 of the present embodiment configured as described above, as shown in FIG. 17, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air flows through the main channel 18 through the main hole 18. It flows toward 14. The airflow flowing into the main flow path 18 is blown out from the main hole 14. At this time, since the main hole 14 is expanded in a trumpet shape, a velocity boundary layer BL of the working airflow is formed downstream from the center line CLm of the main hole 14 at the outlet downstream of the main hole 14. That is, in the downstream of the outlet of the main hole 14, the central portion BLc of the velocity boundary layer BL of the working airflow approaches the mainstream of the assisting airflow blown out from the auxiliary hole 22.

Thereby, in the blowing unit 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state of approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. That is, as shown in FIG. 18, since the main flow AFs of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, the transverse vortex Vt is collapsed by the support airflow and downstream of the outlet of the main hole 14. The effect of suppressing the development of the lateral vortex Vt generated in the velocity boundary layer BL is easily obtained. In the present embodiment, the main inclined structure 32 provided on the inner wall surface 141 of the main hole 14 functions as a vortex suppressing structure.

In the air blowing device 1 of the present embodiment described above, the main inclined structure 32 is provided on the inner wall surface 141 that forms the main hole 14. According to this, the velocity boundary layer BL formed on the downstream side of the main hole 14 by spreading the flow velocity distribution in the vicinity of the inner wall surface 141 of the main hole 14 to the support airflow from the auxiliary hole 22 on the downstream side of the main hole 14. The central portion BLc of the thickness δ can be made closer to the air flow blown out from the auxiliary hole 22. For this reason, the development of the lateral vortex Vt in the velocity boundary layer BL is sufficiently suppressed by the air flow blown out from the auxiliary hole 22.

As described above, also by the air blowing device 1 of the present embodiment, the drawing of air from the surroundings into the airflow blown out from the main hole 14 is suppressed, and the flow velocity of the airflow blown out from the main hole 14 is less attenuated. Therefore, the reach of the working air current blown out from the main hole 14 is increased.

(Modification of the fourth embodiment)
In the above-described fourth embodiment, the inner wall surface 141 of the main hole 14 is inclined so that the tangent line TLm extending along the inner wall surface 141 intersects the center line CLm of the main hole 14 on the entire circumference. Although illustrated, it is not limited to this. Even if the air blowing device 1 has a structure in which, for example, a portion of the inner wall surface 141 of the main hole 14 is inclined such that a tangent line TLm extending along the inner wall surface 141 intersects the center line CLm of the main hole 14. Good.

In the fourth embodiment described above, the inner wall surface 141 of the main hole 14 is illustrated as extending linearly, but is not limited thereto. The inner wall surface 141 of the main hole 14 may extend in a curved shape. In this case, the tangent TLm is a tangent at the downstream end of the inner wall surface 141 of the main hole 14.

In the above-described fourth embodiment, the main inclined structure 32 is applied to the main hole 14, and the enlarged portion 180, the contracted fin 28, and the uneven portion 30 described in the first to third embodiments are not applied. However, the present invention is not limited to this. For example, in the blowout unit 10 in which the main inclined structure 32 is applied to the main hole 14, the air blowing device 1 includes the expansion unit 180, the contraction fin 28, and the concavo-convex unit 30 described in the first to third embodiments. At least one layer reduction structure may be applied.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS. The air blowing device 1 of the present embodiment has a structure in which a tangent line TLs extending along the inner wall surface 221 of each of the plurality of auxiliary holes 22 intersects the center line CLm of the main hole 14 downstream of the outlet of the main hole 14. This is different from the first embodiment. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 19, the blowout portion 10 has a structure in which a tangent line TLs extending along the inner wall surface 221 of each of the plurality of auxiliary holes 22 intersects the center line CLm of the main hole 14 at the outlet downstream of the main hole 14. ing. Specifically, the tangent line TLs is a tangent line extending along the inner wall surface 221 at the downstream end of the inner wall surface 221 of each auxiliary hole 22.

Specifically, a tangent line TLs extending along the inner wall surface 221 of the auxiliary hole 22 has a center line CLm of the main hole 14 downstream from the outlet of the main hole 14 at a part of the inner wall surface 221 of each auxiliary hole 22. An auxiliary inclined structure 34 that is inclined with respect to the center line CLm of the main hole 14 is provided so as to intersect. In other words, the inner wall surface 221 of each auxiliary hole 22 is inclined such that a tangent line TLs extending along the inner wall surface 221 intersects the center line CLm of the main hole 14. For the same reason as in the fourth embodiment, the inner wall surface 221 of each auxiliary hole 22 is within a range where the angle θs formed by the tangent TLs and the center line CLm is an acute angle (for example, a range where the angle is 1 ° to 30 °). It is desirable to set to

Further, in the blowing part 10 of the present embodiment, the cross-sectional area Sc of the main flow path 18 is smaller than the opening area Sm of the main hole 14. That is, the blowing unit 10 of the present embodiment is not provided with a configuration corresponding to the expansion unit 180 of the first embodiment.

In the blowing unit 10 of the present embodiment configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct portion 16 as shown in FIG. It flows toward 14. And the airflow which flowed into the main flow path 18 blows off from the main hole 14 as a working airflow.

When the working airflow is blown out from the main hole 14, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. In the velocity boundary layer BL, it is considered that the lateral vortex Vt is likely to occur near the central portion BLc of the thickness δ.

On the other hand, since the tangent TLs extending along the inner wall surface 221 of the auxiliary hole 22 is inclined with respect to the center line CLm of the main hole 14, the main flow of the support airflow blown out from the auxiliary hole 22 is blown out from the main hole 14. Approaches the central portion BLc of the velocity boundary layer BL of the generated working airflow. That is, in the downstream of the outlet of the main hole 14, the main flow of the support airflow blown out from the auxiliary hole 22 is in a state of approaching the central portion BLc of the velocity boundary layer BL of the working airflow.

Thereby, in the blowing unit 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state of approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. That is, as shown in FIG. 21, since the main flow AFs of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, the transverse vortex Vt is collapsed by the support airflow and downstream of the outlet of the main hole 14. The effect of suppressing the development of the lateral vortex Vt generated in the velocity boundary layer BL is easily obtained. In the present embodiment, the auxiliary inclined structure 34 provided on the inner wall surface 221 of the auxiliary hole 22 functions as a vortex suppressing structure.

In the air blowing device 1 of the present embodiment described above, the auxiliary inclined structure 34 is provided on the inner wall surface 241 that forms the auxiliary hole 22. According to this, the support airflow blown out from the auxiliary hole 22 can be brought close to the central portion BLc of the thickness δ of the velocity boundary layer BL formed downstream of the outlet of the main hole 14. For this reason, the development of the lateral vortex Vt in the velocity boundary layer BL is sufficiently suppressed by the air flow blown out from the auxiliary hole 22. Therefore, even with the air blowing device 1 of the present embodiment, the drawing of air from the surroundings into the airflow blown out from the main hole 14 is suppressed, and the attenuation of the flow velocity of the airflow blown out from the main hole 14 is reduced. The reach of the working air current blown out from the main hole 14 becomes longer.

(Modification of the fifth embodiment)
In the fifth embodiment described above, the inner wall surface 221 of each auxiliary hole 22 is illustrated as being inclined such that the tangent line TLs extending along the inner wall surface 221 intersects the center line CLm of the main hole 14. It is not limited to this. For example, the air blowing device 1 is inclined such that the inner wall surface 221 of some of the auxiliary holes 22 has a tangent line TLs extending along the inner wall surface 221 intersects the center line CLm of the main hole 14. It may be a structure.

In the above-described fifth embodiment, the inner wall surface 221 of the auxiliary hole 22 is illustrated as extending linearly, but is not limited thereto. The inner wall surface 221 of the auxiliary hole 22 may extend in a curved shape. In this case, the tangent line TLs is a tangent line at the downstream end of the inner wall surface 221 of the auxiliary hole 22.

In the above-described fifth embodiment, the auxiliary inclined structure 34 is applied to the auxiliary hole 22, and the enlarged portion 180, the contracted fin 28, and the uneven portion 30 described in the first to third embodiments are not applied. However, the present invention is not limited to this. For example, in the blowout unit 10 in which the auxiliary inclined structure 34 is applied to the auxiliary hole 22, the air blowing device 1 includes the expansion unit 180, the contraction fin 28, and the concavo-convex unit 30 described in the first to third embodiments. At least one layer reduction structure may be applied.

Moreover, the air blowing device 1 is the main part demonstrated in 4th Embodiment with respect to the main hole 14 in the blowing part 10 to which the auxiliary | assistant inclination structure 34 was applied with respect to the auxiliary hole 22 like the above-mentioned 4th Embodiment. The inclined structure 32 may be applied.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIGS. In the present embodiment, the positional relationship between the main hole 14 and the auxiliary hole 22 in the hole forming portion 12 is different from that in the first embodiment. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 22, in the blowing portion 10 of the present embodiment, a part of the main hole 14 and a part of the auxiliary hole 22 overlap each other in the circumferential direction around the center line CLm of the main hole 14. Structure 36 is formed.

More specifically, the main hole 14 has an oval shape as a whole, but has a curved shape in which the outer edge portion meanders in a wavy shape. The plurality of auxiliary holes 22 are formed so that a part of the auxiliary hole 22 protrudes inwardly at the outer edge portion of the main hole 14. That is, the plurality of auxiliary holes 22 are formed with respect to the hole forming portion 12 so as to be positioned inside the virtual line VL connecting at least a part of the main holes 14 to the outermost edge portions.

In the blowing unit 10 of the present embodiment configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16 as shown in FIGS. 23 and 24, the conditioned air passes through the main flow path 18. Flow toward the main hole 14. And the airflow which flowed into the main flow path 18 blows off from the main hole 14 as a working airflow. FIG. 23 is a sectional view taken along line XXIII-XIII in FIG. FIG. 24 is a sectional view taken along line XXIV-XXIV in FIG.

On the other hand, since the mainstream of the support airflow blown out from the auxiliary hole 22 has a part of the main hole 14 and a part of the auxiliary hole 22 overlap each other in the circumferential direction around the center line CLm of the main hole 14. It approaches the central portion BLc of the velocity boundary layer BL of the working air current blown out from the main hole 14. That is, as shown in FIG. 24, downstream of the outlet of the main hole 14, the main flow of the support airflow blown out from the auxiliary hole 22 approaches the central portion BLc of the velocity boundary layer BL of the working airflow.

Thereby, in the blowing unit 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state of approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. That is, as shown in FIG. 25, since the main flow AFs of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, the lateral vortex Vt is collapsed by the support airflow, and downstream of the outlet of the main hole 14. The effect of suppressing the development of the lateral vortex Vt generated in the velocity boundary layer BL is easily obtained. In the present embodiment, the enlarged portion 180 and the overlapping structure 36 function as a vortex suppressing structure.

In the air blowing device 1 of the present embodiment described above, the superposition structure 36 in which the main hole 14 and the auxiliary hole 22 overlap each other in the circumferential direction centering on the center line CLm of the main hole 14 is provided for the blowing portion 10. It has been. According to this, the support airflow blown out from the auxiliary hole 22 can be brought close to the central portion BLc of the thickness δ of the velocity boundary layer BL formed downstream of the outlet of the main hole 14. For this reason, the development of the lateral vortex Vt in the velocity boundary layer BL is sufficiently suppressed by the air flow blown out from the auxiliary hole 22. Therefore, even with the air blowing device 1 of the present embodiment, the drawing of air from the surroundings into the airflow blown out from the main hole 14 is suppressed, and the attenuation of the flow velocity of the airflow blown out from the main hole 14 is reduced. The reach of the working air current blown out from the main hole 14 becomes longer.

(Modification of the sixth embodiment)
In the above-described sixth embodiment, as the superposition structure 36, a structure in which a part of the main hole 14 and a part of the auxiliary hole 22 overlap each other in the circumferential direction around the center line CLm of the main hole 14 is exemplified. However, the present invention is not limited to this. The overlapping structure 36 may have a structure in which a part of the main hole 14 and the whole auxiliary hole 22 overlap each other in the circumferential direction centering on the center line CLm of the main hole 14.

In the above-described sixth embodiment, the example in which the enlarged portion 180 is provided with respect to the main flow path 18 has been described, but the present invention is not limited to this. The air blowing device 1 may be configured such that only the superposition structure 36 is applied to the blowing portion 10 and the enlarged portion 180 is not provided to the main flow path 18.

In the above-described sixth embodiment, the enlarged portion 180 and the overlapping structure 36 are applied to the blowout portion 10, and the contracted fin 28 and the uneven portion 30 described in the second and third embodiments are not applied. However, the present invention is not limited to this. For example, in the blowout unit 10 in which the superposition structure 36 is applied to the blowout unit 10, the air blowing device 1 reduces at least one layer of the contracted fin 28 and the concavo-convex unit 30 described in the second and third embodiments. A structure may be applied. In the air blowing device 1, the main inclined structure 32 described in the fourth embodiment may be applied to the main hole 14 in the blowing portion 10 in which the superposition structure 36 is applied to the blowing portion 10. .

(Seventh embodiment)
Next, a seventh embodiment will be described with reference to FIG. The present embodiment is different from the first embodiment in that a communication hole 261 for communicating the main channel 18 and the auxiliary channel 24 is formed with respect to the partition portion 26. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 26, the blowout unit 10 of the present embodiment has a communication hole 261 that allows the main channel 18 and the auxiliary channel 24 to communicate with the partition unit 26 that partitions the main channel 18 and the auxiliary channel 24. Is formed. A plurality of communication holes 261 are formed in the partition portion 26 from the upstream side to the downstream side of the air flow.

The communication hole 261 is a through hole through which a part of the airflow flowing through the main channel 18 leads to the auxiliary channel 24. The communication hole 261 has a main opening 261 a that opens to the main flow path 18 side in the partition portion 26, and an auxiliary opening 261 b that opens to the auxiliary flow path 24 side in the partition portion 26. The communication hole 261 is formed at a position where the main opening 261a is on the upstream side of the air flow from the auxiliary opening 261b.

In the blowout portion 10 of the present embodiment configured as described above, a communication hole 261 is provided in the partition portion 26. For this reason, as shown by the arrow Fa in FIG. 26, a part of the airflow flowing through the main flow path 18 is guided to the auxiliary flow path 24 through the communication hole 261. The airflow that passes through the communication hole 261 facilitates the flow of the airflow along the inner wall surface 181 that forms the main flow path 18. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced. The thickness δ of the velocity boundary layer BL formed downstream from the outlet of the main hole 14 is smaller than that in the first embodiment.

For this reason, in the blowing portion 10 of the present embodiment, the mainstream of the support airflow blown out from the auxiliary hole 22 flows in a state of being closer to the central portion BLc of the thickness δ of the velocity boundary layer BL. Thereby, since the main flow of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, the effect of suppressing the development of the lateral vortex Vt generated in the velocity boundary layer BL downstream of the outlet of the main hole 14 by the support airflow. Is easily obtained. In the present embodiment, the enlarged portion 180 provided in the main channel 18 and the communication hole 261 formed in the partition portion 26 function as a vortex suppressing structure.

Although the air blowing device 1 of the present embodiment described above has the communication hole 261 formed with respect to the partition portion 26, other configurations are common to the first embodiment. For this reason, the air blowing apparatus 1 of this embodiment can obtain the effect obtained from a structure common to 1st Embodiment similarly to 1st Embodiment.

In particular, in this embodiment, the vortex suppression structure includes a communication hole 261 formed in the partition portion 26 as well as the enlarged portion 180. This makes it possible to reduce the thickness δ of the speed boundary layer BL without adding any parts, and is therefore suitable when the installation space is greatly limited as in a moving body such as a vehicle.

(Modification of the seventh embodiment)
In the above-described seventh embodiment, the example in which the plurality of communication holes 261 are formed in the partition portion 26 has been described, but the present invention is not limited to this. The blow-out portion 10 may have one communication hole 261 with respect to the partition portion 26. Further, the communication hole 261 may have the main opening 261a and the auxiliary opening 261b formed at the same position in the air flow direction as long as the airflow flowing through the main flow path 18 can be guided to the auxiliary flow path 24. .

In the seventh embodiment described above, the example in which the enlarged portion 180 is provided with respect to the main flow path 18 has been described, but the present invention is not limited to this. The air blowing device 1 may be configured such that the enlarged portion 180 is not provided with respect to the main flow path 18.

(Eighth embodiment)
Next, an eighth embodiment will be described with reference to FIGS. The present embodiment is different from the first embodiment in that a vertical vortex generating mechanism 263 is provided for the upstream end 262 of the partition portion 26. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 27, the partition portion 26 is provided with an uneven vertical vortex generating mechanism 263 at an upstream end portion 262 located on the upstream side of the air flow. The vertical vortex generating mechanism 263 generates a vertical vortex near the upstream end 262 of the partition portion 26. The vertical vortex is a spiral vortex in which the vortex core is oriented in the same direction as the main flow direction.

The vertical vortex generating mechanism 263 is composed of a plurality of concavo-convex protruding pieces protruding from the upstream end 262 of the partition portion 26. Specifically, as shown in FIG. 28, the vertical vortex generating mechanism 263 is configured by a plurality of triangular projecting pieces formed at the upstream end 262. The protruding piece has a sharpened shape by linearly intersecting two sides extending toward the tip.

In the blowout unit 10 configured as described above, a vertical vortex generating mechanism 263 is provided at the upstream end 262 of the partition unit 26. For this reason, a vertical vortex is generated when the airflow passes near the upstream end 262 of the partition portion 26. The vertical vortex generated by the vertical vortex generating mechanism 263 is a spiral vortex in which the vortex core is directed in the same direction as the airflow flowing around the partition portion 26, and includes a velocity component toward the surface of the partition portion 26. . For this reason, the airflow flowing around the partition portion 26 is pressed so as to approach the surface of the partition portion 26 by the vertical vortex generated by the vertical vortex generating mechanism 263, and thereby the inner wall surface 181 that forms the main flow path 18. It becomes easy to flow along. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced. The thickness δ of the velocity boundary layer BL formed downstream from the outlet of the main hole 14 is smaller than that in the first embodiment.

Other configurations are the same as those in the first embodiment. Since the air blowing device 1 of the present embodiment has the same configuration as that of the first embodiment, the effects obtained from the common configuration can be obtained similarly to the first embodiment.

Particularly, in the air blowing device 1 of the present embodiment, the vertical vortex generating mechanism 263 is provided at the upstream end 262 of the partitioning portion 26. According to this, the airflow flowing around the partition portion 26 is likely to flow along the surface of the partition portion 26 (that is, the inner wall surface 181 forming the main flow path 18) by the vertical vortex generated by the vertical vortex generating mechanism 263. Therefore, it is possible to realize a structure in which the central portion BLc of the thickness δ of the velocity boundary layer BL of the working airflow formed downstream from the outlet of the main hole 14 is brought close to the mainstream of the support airflow.

(Modification of the eighth embodiment)
In the above-described eighth embodiment, the example in which the enlarged portion 180 is provided with respect to the main flow path 18 has been described, but the present invention is not limited to this. The air blowing device 1 may be configured such that the enlarged portion 180 is not provided with respect to the main flow path 18. The vertical vortex generating mechanism 263 may be added to the upstream end portion of the contracted fin 28 described in the second embodiment. According to this, the airflow that flows around the contracted fin 28 is likely to flow along the surface of the contracted fin 28 by the longitudinal vortex generated by the longitudinal vortex generating mechanism 263. As a result, the turbulence of the working air flow accompanying the addition of the contracted fins 28 can be sufficiently suppressed.

(Ninth embodiment)
Next, a ninth embodiment will be described with reference to FIG. The present embodiment is different from the first embodiment in that a main flow guide 38 is provided for the main flow path 18. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 29, in the blowing unit 10 of the present embodiment, the cross-sectional area Sc of the main flow path 18 is approximately the same as the opening area Sm of the main hole 14. That is, the blowing unit 10 of the present embodiment is not provided with a configuration corresponding to the expansion unit 180 of the first embodiment.

Further, the blow-out unit 10 has a main flow guide 38 that guides the airflow flowing along the inner wall surface 181 that forms the main flow path 18 to the outlet downstream of the auxiliary hole 22. The main flow guide 38 includes an upper main plate 381 and a lower main plate 382.

The upper main plate 381 guides the airflow flowing along the upper wall surface 181a of the inner wall surface 181 forming the main flow path 18 to the downstream downstream of the auxiliary hole 22 close to the upper wall surface 181a. The upper main plate 381 is disposed between the upper wall surface 181 a forming the main flow path 18 and the center line CLm of the main flow path 18. The upper main plate 381 is disposed in a posture inclined with respect to the center line CLs of the auxiliary hole 22 so that the tangent TLg1 at the downstream end 381a intersects the center line CLs of the auxiliary hole 22 downstream of the outlet of the auxiliary hole 22. ing. The upper main plate 381 is disposed inside the duct portion 16 so that the downstream end 381a does not protrude from the main hole 14.

The lower main plate 382 guides the airflow flowing along the lower wall surface 181b of the inner wall surface 181 forming the main flow path 18 to the downstream of the outlet of the auxiliary hole 22 close to the lower wall surface 181b. The lower main plate 382 is disposed between the lower wall surface 181 b that forms the main flow path 18 and the center line CLm of the main flow path 18. The lower main plate 382 is arranged in a posture inclined with respect to the center line CLs of the auxiliary hole 22 so that the tangent line TLg2 at the downstream end 382a intersects the center line CLs of the auxiliary hole 22 downstream of the outlet of the auxiliary hole 22. ing. The lower main plate 382 is disposed inside the duct portion 16 so that the downstream end 382a thereof does not protrude from the main hole 14.

The main plates 381 and 382 extend along the long side of the inner wall surface 141 of the main hole 14 at a substantially central portion of the short side of the inner wall surface 141 of the main hole 14. Although not shown, the main plates 381 and 382 have both longitudinal ends connected to the inside of the duct portion 16.

In the blowout unit 10 of the present embodiment configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air flows toward the main hole 14 via the main flow path 18. The airflow flowing into the main flow path 18 is blown out from the main hole 14. At this time, the airflow flowing along the inner wall surface 181 forming the main flow path 18 is diffused up and down by the main flow guide 38 and blown out. For this reason, the velocity boundary layer BL of the working airflow is formed downstream from the center line CLm of the main hole 14 at the outlet downstream of the main hole 14.

Thereby, in the blowing part 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 approaches the central portion BLc of the thickness δ of the velocity boundary layer BL, as in the fourth embodiment. Flowing. That is, since the main flow AFs of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, the support airflow collapses the transverse vortex Vt and generates in the velocity boundary layer BL downstream of the outlet of the main hole 14. The effect of suppressing the development of the lateral vortex Vt is easily obtained. In the present embodiment, the mainstream guide 38 functions as a vortex suppression structure.

In the air blowing device 1 of the present embodiment described above, the main flow guide 38 is provided in the main flow path 18. According to this, the velocity boundary layer BL formed on the downstream side of the main hole 14 by spreading the flow velocity distribution in the vicinity of the inner wall surface 141 of the main hole 14 to the support airflow from the auxiliary hole 22 on the downstream side of the main hole 14. The central portion BLc of the thickness δ can be made closer to the air flow blown out from the auxiliary hole 22. For this reason, the development of the lateral vortex Vt in the velocity boundary layer BL is sufficiently suppressed by the air flow blown out from the auxiliary hole 22.

(10th Embodiment)
Next, a tenth embodiment will be described with reference to FIG. The present embodiment is different from the first embodiment in that an auxiliary guide 40 is provided for the auxiliary flow path 24. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 30, in the blowing unit 10 of the present embodiment, the cross-sectional area Sc of the main flow path 18 is approximately the same as the opening area Sm of the main hole 14 as in the ninth embodiment. That is, the blowing unit 10 of the present embodiment is not provided with a configuration corresponding to the expansion unit 180 of the first embodiment.

Further, the blowout unit 10 has an auxiliary guide 40 that guides the airflow flowing along the inner wall surface 241 that forms the auxiliary flow path 24 to the downstream of the outlet of the main hole 14. The auxiliary guide 40 is composed of a plurality of auxiliary plates 41 arranged in the auxiliary flow path 24.

The plurality of auxiliary plates 41 are inclined with respect to the center line CLm of the main hole 14 so that the tangent line TLg3 at the downstream end 411 intersects the center line CLm of the main hole 14 downstream of the outlet of the main hole 14. Has been placed. The plurality of auxiliary plates 41 are arranged inside the duct portion 16 so that the downstream ends 411 thereof do not protrude from the main hole 14.

In the blowout unit 10 of the present embodiment configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air flows toward the main hole 14 via the main flow path 18. The airflow flowing into the main flow path 18 is blown out from the main hole 14.

On the other hand, the main stream of the support airflow blown out from the auxiliary hole 22 flows while being inclined with respect to the center line CLm of the main hole 14 by the auxiliary guide 40. That is, in the downstream of the outlet of the main hole 14, the main flow of the support airflow blown out from the auxiliary hole 22 is in a state of approaching the central portion BLc of the velocity boundary layer BL of the working airflow.

Thereby, in the blowing part 10 of this embodiment, in the state where the mainstream AFs of the support airflow blown out from the auxiliary hole 22 approaches the central portion BLc of the thickness δ of the velocity boundary layer BL, as in the fifth embodiment. Flowing. That is, since the main flow AFs of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, the support airflow collapses the transverse vortex Vt and generates in the velocity boundary layer BL downstream of the outlet of the main hole 14. The effect of suppressing the development of the lateral vortex Vt is easily obtained. In the present embodiment, the auxiliary guide 40 functions as a vortex suppressing structure.

In the air blowing device 1 of the present embodiment described above, the auxiliary guide 40 is provided in the auxiliary flow path 24. Also in this manner, as in the fifth embodiment, the main flow of the support airflow blown out from the auxiliary hole 22 is brought closer to the central portion BLc of the thickness δ of the velocity boundary layer BL formed downstream from the outlet of the main hole 14. Can do.

(Eleventh embodiment)
Next, an eleventh embodiment will be described with reference to FIGS. 31 and 32. FIG. In the present embodiment, an opening shape of the main hole 14 that is suitable for increasing the reach of the working air current blown out from the main hole 14 will be described.

As shown in FIG. 31, the hole forming part 12 of the present embodiment has a main hole 14 as a single hole, as in the first embodiment. Unlike the first embodiment, the plurality of auxiliary holes 22 are not formed.

The main hole 14 has a plurality of

edge portions

142a, 142b, 142c, 142d that form the opening edge thereof. The plurality of

edges

142a, 142b, 142c, 142d are obtained by dividing the opening edge of the main hole 14 at the curvature change point.

According to the investigation by the present inventors, when there is a corner at the opening edge of the main hole 14, the lateral vortex Vt tends to develop into a large-scale one at the corner, and the working air current blown out from the main flow It has been found that the reach of will be shortened. In addition, when the amount of change in curvature at the opening edge of the main hole 14 is large, the countless vortex rings formed when the air flow is blown out from the main hole 14 easily interfere with each other, so that the arrival of the working air flow blown out from the main flow is reached. There is also a tendency for the distance to become shorter.

In consideration of these, the main hole 14 of the present embodiment is annularly connected so that the edge portions 142a to 142d having different curvatures are adjacent to each other and the connecting portions of the adjacent edge portions 142a to 142d are rounded. Yes.

Specifically, the main hole 14 according to the present embodiment includes an

arcuate edge

142a, 142b having the same radius and arc length and a linear edge having a zero curvature so that the opening edge is an ellipse. 142c and 142d are connected alternately. Note that the main hole 14 of the present embodiment is composed of two types of edge portions 142a to 142d having different curvatures. Further, the main hole 14 of the present embodiment is composed of four edge portions 142a to 142d, and the four edge portions 142a to 142d are connected by four connection portions T1 to T4.

In the blow-out portion 10 in which the main hole 14 is formed, the connecting portions of the edge portions 142a to 142d, which are the changing points of curvature at the opening edge of the main hole 14, have roundness. The opening shape has no corners. As a result, the development of the lateral vortex Vt in the vicinity of the outlet downstream of the main hole 14 is sufficiently suppressed, so that the reach of the working air current blown out from the main hole 14 can be increased.

The main hole 14 is composed of two kinds of edge portions 142a to 142d having different curvatures. According to this, since the amount of change in the curvature at the opening edge of the main hole 14 is small, interference of innumerable vortex rings formed when the air flow is blown out from the main hole 14 is suppressed, and the reach of the working air flow is reduced. Improvements can be made.

Furthermore, the main hole 14 is composed of four edge portions 142a to 142d, and the four edge portions 142a to 142d are connected at four locations T1 to T4. According to this, since the change point of the curvature at the opening edge of the main hole 14 is small, the interference of innumerable vortex rings formed when the airflow is blown out from the main hole 14 is suppressed, and the reach of the working airflow Can be improved.

Here, as for the arc-shaped

edge portions

142a and 142b, when the radius is less than a predetermined value (specifically, 0.1 mm), the lateral vortex Vt develops into a large one like the corner portion. There is a possibility that it becomes easy to do. For this reason, when the arc-shaped

edges

142a and 142b are included in the plurality of edges 142a to 142d, the radius is preferably set to 0.1 mm or more.

(Modification of the eleventh embodiment)
In the eleventh embodiment described above, the opening edge of the main hole 14 is illustrated as an ellipse, but is not limited thereto. When the main hole 14 includes four edge portions 142a to 142d, each of the edge portions 142a to 142d may have an arc shape.

For example, as shown in the first modification of FIG. 33, the main hole 14 may have an opening shape in which two kinds of arc-shaped edge portions 142a to 142d having different curvatures are connected in an annular shape. As shown in the second modification example in FIG. 34, the main hole 14 may have an opening shape in which three kinds of arc-shaped edges 142a to 142d having different curvatures are connected in an annular shape. As shown in the third modification of FIG. 35, the main hole 14 may have an opening shape in which four types of arc-shaped edges 142a to 142d having different curvatures are connected in an annular shape. As shown in the fourth modification example in FIG. 36, when the main hole 14 is composed of four edge portions 142a to 142d, one of the edge portions 142a to 142d may be linear.

Further, the main hole 14 may be configured with six edge portions 142a to 142f instead of the four edge portions 142a to 142d. Specifically, as shown in the fifth modified example of FIG. 37, the main hole 14 includes three arc-shaped edges 142a to 142c having the same radius and arc length, and three straight edges 142d to 142f. May be formed in an opening shape in which the two are connected in an annular shape. As shown in the sixth modification of FIG. 38, the main hole 14 has an opening shape in which three arc-shaped edges 142a to 142c having different radii and three straight edges 142d to 142f are annularly connected. It may be.

Furthermore, the main hole 14 may be constituted by eight edge portions 142a to 142h. Specifically, as shown in the seventh modified example of FIG. 39, the main hole 14 includes four arc-shaped edges 142a to 142d having the same radius and arc length, and straight lines having the same length of the opposing edges. It may be an opening shape in which the four edge portions 142e to 142h are connected in an annular shape. As shown in the eighth modified example of FIG. 40, the main hole 14 includes four arc-shaped edges 142a to 142d having the same radius and arc length, and four linear edges having opposite edge lengths different from each other. It may have an opening shape in which the portions 142e to 142h are connected in an annular shape. As shown in the ninth modification of FIG. 41, the main hole 14 is formed by annularly forming four arc-shaped edges 142a to 142d having different radii and four straight edges 142e to 142h having the same length. It may have a connected opening shape. As shown in the tenth modified example in FIG. 42, the main hole 14 is formed by annularly forming four arc-shaped edges 142a to 142d having different radii and four linear edges 142d to 142h having different lengths. It may have a connected opening shape. As shown in the eleventh modified example of FIG. 43, the main hole 14 has four arc-shaped edges 142a to 142d having partially different radii, and four linear edges 142e having equal lengths of the opposing edges. It may have an opening shape in which .about.142h is annularly connected. As shown in the twelfth modification of FIG. 44, the main hole 14 is formed by annularly connecting four arc-shaped edges 142a to 142d having different radii and four linear edges 142d to 142h having different lengths. It may be an opening shape.

(Twelfth embodiment)
Next, a twelfth embodiment will be described with reference to FIGS. 45 and 46. FIG. As shown in FIGS. 45 and 46, the blowout portion 10 of the present embodiment has auxiliary holes 22 formed around the main hole 14 in the blowout portion 10 of the eleventh embodiment.

Specifically, a plurality of auxiliary holes 22 are formed around the main hole 14 having an elliptical opening edge so as to surround the main hole 14. Other configurations are the same as those in the eleventh embodiment. According to the blowing unit 10 of the present embodiment, the air flow of the working airflow can be suppressed by the support airflow that blows out from the auxiliary hole 22.

(Modification of the twelfth embodiment)
In the above-described twelfth embodiment, the auxiliary hole 22 is formed around the main hole 14 whose opening edge is an ellipse. However, the present invention is not limited to this. For example, as shown in FIG. 47, the blowout portion 10 may have a configuration in which auxiliary holes 22 are formed around the main hole 14 whose opening edge is not an ellipse.

(Other embodiments)
As mentioned above, although typical embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment, for example, can be variously changed as follows.

In the above-described embodiment, the example in which one main hole 14 is formed in the hole forming portion 12 has been described, but the present invention is not limited to this. The air blowing device 1 may have a structure in which a plurality of main holes 14 are formed in the hole forming portion 12. In this case, for example, the plurality of auxiliary holes 22 are arranged so as to surround the plurality of main holes 14 as a single hole group, or to surround each of the plurality of main holes 14. That's fine.

In the above-described embodiment, the example in which the auxiliary hole 22 is configured by a plurality of round holes has been described, but the present invention is not limited to this. The auxiliary hole 22 may be configured by, for example, a curved slit hole surrounding the main hole 14. In this case, the auxiliary hole 22 is not limited to a plurality of slit holes, and can be constituted by a single slit hole.

In the above-described embodiment, the main flow path 18 and the auxiliary flow path 24 are formed inside the single duct portion 16, but the present invention is not limited to this. In the air blowing device 1, for example, a portion that forms the main flow path 18 and a portion that forms the auxiliary flow path 24 in the duct portion 16 may be configured separately.

In the above-described embodiment, the blowout portion 10 having the flange portion 20 is exemplified, but the present invention is not limited to this. The blow-out part 10 may have a configuration in which, for example, the hole forming part 12 and the duct part 16 are included and the flange part 20 is not included.

In the above-described embodiment, an example in which the air blowing device 1 of the present disclosure is applied to the air blowing port of an air conditioning unit that air-conditions the vehicle interior is illustrated, but the present invention is not limited to this. The air blowing device 1 according to the present disclosure is not limited to a moving body such as a vehicle, but can be widely applied to an air blowing port of an installation type air conditioning unit for home use or the like. The air blowing device 1 of the present disclosure is not limited to an air conditioning unit that air-conditions a room. For example, a temperature control that blows out temperature-controlled air that adjusts the temperature of an air outlet of a humidifying device that humidifies the room, a heating element, or the like. It can also be applied to the air outlet of equipment.

In the above-described embodiment, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where the element is clearly considered to be essential in principle.

In the above-described embodiment, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is particularly limited to a specific number when clearly indicated as essential and in principle. Except in some cases, the number is not limited.

In the above embodiment, when referring to the shape, positional relationship, etc. of the component, etc., the shape, positional relationship, etc. unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to etc.

(Summary)
According to the first aspect shown in a part or all of the above-described embodiments, the air blowing device includes at least one main hole and at least one auxiliary hole formed around the main hole. A part. The blowout portion is provided with a vortex suppressing structure that suppresses the development of a lateral vortex formed in the velocity boundary layer of the working airflow downstream of the outlet of the main hole. This vortex suppression structure has a structure in which the central portion of the velocity boundary layer of the working airflow formed downstream of the outlet of the main hole and the mainstream of the support airflow are brought closer to the downstream of the outlet of the main hole.

According to the second aspect, the vortex suppressing structure of the air blowing device includes a layer reducing structure that reduces the thickness of the velocity boundary layer formed along the inner wall surface of the main hole. Thus, according to the structure in which the thickness of the velocity boundary layer formed along the inner wall surface of the main hole is reduced, the central part of the thickness of the velocity boundary layer formed downstream of the outlet of the main hole is blown out from the auxiliary hole. Can be close to the airflow.

According to the 3rd viewpoint, the blowing part of the air blowing apparatus contains the main flow path which allows the airflow which blows off from a main hole to pass through. The main flow path is provided with an enlarged portion having a cross-sectional area larger than the opening area of the main hole as a layer reduction structure. Thus, if the structure is provided with an enlarged portion with respect to the main flow path, the flow velocity difference between the vicinity of the center line of the main hole and the vicinity of the inner wall surface is reduced due to the contracted flow generated in the main flow path, and the velocity boundary layer The thickness can be reduced. That is, it is possible to realize a structure in which the central part of the thickness of the velocity boundary layer of the working airflow formed downstream from the outlet of the main hole is brought close to the mainstream of the support airflow.

According to the fourth aspect, in the air blowing device, the main flow path is provided with a contracted fin that contracts the airflow flowing through the main flow path as a layer contraction structure. If the layer contraction structure includes not only the enlarged portion but also the contraction fins, it is possible to reduce the thickness of the velocity boundary layer due to contraction while suppressing an increase in the size of the apparatus due to the expansion of the main flow path. Such a configuration is suitable when the installation space is greatly limited like a moving body.

According to the 5th viewpoint, the blowing part of the air blowing apparatus contains the main flow path which allows the airflow which blows off from a main hole to pass through. And the main flow path is provided with the contraction fin which contracts the airflow which flows through the main flow path as a layer contraction structure. Thus, if the structure is provided with the contracted fins for the main channel, the contracted flow generated in the main channel reduces the difference in flow velocity between the center line of the main hole and the inner wall surface, and the velocity boundary layer Can be reduced in thickness. That is, it is possible to realize a structure in which the central part of the thickness of the velocity boundary layer of the working airflow formed downstream from the outlet of the main hole is brought close to the mainstream of the support airflow.

According to the sixth aspect, the blowing part of the air blowing device includes a main flow path through which the air flow blown from the main hole passes. At least a part of the main flow path is provided with a concavo-convex part in which a concave part and a convex part are alternately arranged along the flow direction of the air flow in the main flow path as a layer reduction structure. In this way, if the structure is provided with a concavo-convex portion on a part of the inner wall surface of the main flow path, the vortex generated inside the concavo-convex portion plays a role like a ball bearing, so that the friction of the inner wall surface of the main flow path The coefficient becomes smaller. For this reason, the difference in flow velocity between the vicinity of the center line of the main hole and the vicinity of the inner wall surface is reduced, and the thickness of the velocity boundary layer can be reduced. That is, it is possible to realize a structure in which the central part of the thickness of the velocity boundary layer of the working airflow formed downstream from the outlet of the main hole is brought close to the mainstream of the support airflow.

According to the seventh aspect, the uneven portion of the air blowing device is formed by a plurality of grooves provided on the inner wall surface of the main flow path. If the concave and convex portion is configured with a plurality of grooves in this manner, the size of the main flow path can be secured and pressure loss in the main flow path can be suppressed as compared with the case where the concave and convex portion is configured with a plurality of protrusions. This greatly contributes to the improvement of the reach of the working airflow.

According to the eighth aspect, the blowing unit of the air blowing device includes a main channel that allows the airflow blown from the main hole to pass through, an auxiliary channel that allows the airflow blown from the auxiliary hole to pass through, and a partition that partitions the main channel and the auxiliary channel. Contains. The partition portion is formed with at least one communication hole for guiding a part of the airflow flowing through the main channel to the auxiliary channel as a vortex suppressing structure.

According to this, the airflow easily flows along the inner wall surface forming the main flow path by the airflow flowing from the main flow path to the auxiliary flow path through the communication hole. For this reason, the difference in flow velocity between the vicinity of the center line of the main hole and the vicinity of the inner wall surface is reduced, and the thickness of the velocity boundary layer can be reduced. That is, it is possible to realize a structure in which the central part of the thickness of the velocity boundary layer of the working airflow formed downstream from the outlet of the main hole is brought close to the mainstream of the support airflow.

According to the ninth aspect, the blowing unit of the air blowing device includes a main channel that allows the airflow blown from the main hole to pass through, an auxiliary channel that allows the airflow blown from the auxiliary hole to pass through, and a partition that partitions the main channel and the auxiliary channel. Contains. The partition is provided with an uneven vertical vortex generating mechanism for generating vertical vortices at the upstream end located on the upstream side of the air flow.

According to this, the airflow flowing around the partition portion is easily flown along the surface of the partition portion (that is, the inner wall surface forming the main flow path) by the vertical vortex generated by the vertical vortex generating mechanism. For this reason, the difference in flow velocity between the vicinity of the center line of the main hole and the vicinity of the inner wall surface is reduced, and the thickness of the velocity boundary layer can be reduced. That is, it is possible to realize a structure in which the central part of the thickness of the velocity boundary layer of the working airflow formed downstream from the outlet of the main hole is brought close to the mainstream of the support airflow.

According to the tenth aspect, in the main hole of the air blowing device, a tangent line extending along the inner wall surface of the main hole intersects with the center line of the auxiliary hole at the downstream side of the outlet of the auxiliary hole at least partially forming the inner wall surface. Thus, the main inclined structure is inclined with respect to the center line of the auxiliary hole. And the vortex suppression structure contains the main inclination structure. According to this, the flow velocity distribution in the vicinity of the inner wall surface forming the main hole spreads to the air flow blown out from the auxiliary hole downstream of the main hole, so that the thickness of the velocity boundary layer formed downstream of the main hole outlet is reduced. The central portion can be brought close to the airflow blown out from the auxiliary hole. The “center line of the auxiliary hole” is a line that passes through the center of the auxiliary hole and extends along the main flow of the airflow blown from the auxiliary hole.

According to the eleventh aspect, the blow-out portion of the air blowing device passes a main flow guide through which the air flow blown from the main hole passes, and a main flow guide that guides the air flow flowing along the inner wall surface forming the main flow channel to the outlet downstream of the auxiliary hole. Contains. The vortex suppression structure includes a mainstream guide. This also spreads the flow velocity distribution near the inner wall surface forming the main hole to the air flow blown from the auxiliary hole downstream of the main hole, so that the center of the thickness of the velocity boundary layer formed downstream of the main hole outlet The part can be brought close to the air flow blown out from the auxiliary hole.

According to the twelfth aspect, in the auxiliary hole of the air blowing device, the tangent line extending along the inner wall surface of the auxiliary hole intersects the center line of the main hole at the downstream of the outlet of the main hole at least at a part of the inner wall surface. Thus, the auxiliary inclined structure is inclined with respect to the center line of the main hole. The vortex suppressing structure includes an auxiliary inclined structure. According to this, the air flow blown out from the auxiliary hole can be brought closer to the central portion of the thickness of the velocity boundary layer formed downstream of the outlet of the main hole. Note that the “center line of the main hole” is a line that passes through the center of the main hole and extends along the main stream of the airflow blown out of the main hole.

According to the thirteenth aspect, the blowing unit of the air blowing device is an auxiliary channel that allows the airflow blown from the auxiliary hole to pass therethrough, and the auxiliary that guides the airflow that flows along the inner wall surface forming the auxiliary channel to the outlet downstream of the main hole. Includes a guide. The vortex suppression structure includes an auxiliary guide. Also by this, the main flow of the support airflow blown out from the auxiliary hole can be brought closer to the central portion of the thickness of the velocity boundary layer formed downstream of the outlet of the main hole.

According to the fourteenth aspect, the blowing portion of the air blowing device has a superposition structure in which a part of the main hole and at least a part of the auxiliary hole overlap each other in the circumferential direction around the center line of the main hole. ing. And the vortex suppression structure contains the superposition | polymerization structure. Also by this, the main flow of the support airflow blown out from the auxiliary hole can be brought closer to the central portion of the thickness of the velocity boundary layer formed downstream of the outlet of the main hole.

According to the fifteenth aspect, the main hole of the air blowing device has a plurality of edges that form the opening edge of the main hole. The plurality of edges are annularly connected so that edges having different curvatures are adjacent to each other, and connecting portions of the adjacent edges are rounded. According to this, since the connection part of each edge part which is a change point of the curvature in the opening edge of a main hole has roundness, a main hole becomes an opening shape without a corner | angular part. As a result, the development of the lateral vortex near the outlet downstream of the main hole is sufficiently suppressed, so that the reach of the working air current blown out from the main flow can be increased.

According to a sixteenth aspect, the air blowing device includes a blowing unit that blows out an air flow. The blow-out part includes at least one main hole that blows out an air flow serving as a working air flow. The main hole has a plurality of edges that form the opening edge of the main hole. The plurality of edges are connected so that edges having different curvatures are adjacent to each other, and connecting portions of the adjacent edges are rounded.

According to the seventeenth aspect, the blowing portion of the air blowing device has at least one auxiliary hole that blows out a support airflow that is formed around the main hole and suppresses the air drawing action by the working airflow blown out of the main hole. Is included. According to this, the drawing-in of the air of the working airflow can be suppressed by the support airflow that blows out from the auxiliary hole.

According to an eighteenth aspect, the main hole of the air blowing device is composed of two types of the edge portions having different curvatures. According to this, since the amount of change in the curvature at the opening edge of the main hole is small, the interference of the infinite number of vortex rings formed when the airflow is blown from the main hole is suppressed, and the reach of the working airflow is improved. Can be achieved.

According to the nineteenth aspect, the main hole of the air blowing device is composed of four edges, and the four edges are connected at four locations. According to this, since there are few change points of the curvature at the opening edge of the main hole, the interference of innumerable vortex rings formed when the airflow is blown out from the main hole is suppressed, and the reach of the working airflow is improved. Can be achieved.

Claims

An air blowing device,
It has a blowout part (10) that blows out airflow,
The blowing section is
At least one main hole (14) that blows out an airflow that is a working airflow;
At least one auxiliary hole (22) for blowing out a support airflow for suppressing an air drawing action by the working airflow formed around the main hole and blown out of the main hole;
A vortex suppression structure (180, 28, 30, 32, 34, 36, 261, 263, 38, which suppresses the development of a lateral vortex formed in the velocity boundary layer (BL) of the working airflow downstream of the outlet of the main hole. 40), and
The vortex suppression structure has a structure in which the central portion (BLc) of the velocity boundary layer thickness (δ) of the working airflow formed downstream of the outlet of the main hole and the mainstream of the support airflow approach the outlet downstream of the main hole. Air blowing device that is.
The air blowing device according to claim 1, wherein the vortex suppressing structure includes a layer reduction structure (180, 28, 30) for reducing a thickness of a velocity boundary layer formed along an inner wall surface of the main hole.
The blowout part includes a main flow path (18) that allows an airflow blown from the main hole to pass therethrough,
The air blowing device according to claim 2, wherein the main channel is provided with an enlarged portion (180) having a cross-sectional area larger than an opening area of the main hole as the layer reducing structure.
The air blowing device according to claim 3, wherein the main flow path is provided with a contraction fin (30) for contracting an airflow flowing through the main flow path as the layer contraction structure.
The blowout part includes a main flow path (18) that allows an airflow blown from the main hole to pass therethrough,
The air blowing device according to claim 2, wherein the main flow path is provided with a contraction fin (30) for contracting an airflow flowing through the main flow path as the layer contraction structure.
The blowout part includes a main flow path (18) that allows an airflow blown from the main hole to pass therethrough,
The concavo-convex portion (30) in which concave portions and convex portions are alternately arranged along the flow direction of the air flow in the main flow channel is provided in at least a part of the main flow channel as the layer reducing structure. Air blowing device.
The air blowout device according to claim 6, wherein the uneven portion is formed by a plurality of grooves (301) provided in an inner wall surface (181) of the main flow path.
The blow-out section includes a main flow path (18) that allows an air flow blown from the main hole to pass therethrough, an auxiliary flow path (24) that allows an air flow blown from the auxiliary hole to pass through, and a partition section (26 that divides the main flow path and the auxiliary flow path. )
The air blowout according to claim 1 or 2, wherein at least one communication hole (261) for guiding a part of the airflow flowing through the main flow path to the auxiliary flow path as the vortex suppressing structure is formed in the partition part. apparatus.
The blow-out section includes a main flow path (18) that allows an air flow blown from the main hole to pass therethrough, an auxiliary flow path (24) that allows an air flow blown from the auxiliary hole to pass through, and a partition section (26 that divides the main flow path and the auxiliary flow path. )
The said partition part is provided with the uneven | corrugated vertical vortex generating mechanism (263) which generate | occur | produces a vertical vortex in the upstream edge part (262) located in an air flow upstream. Air blowing device.
The main hole has a tangent line (TLm) extending along the inner wall surface of the main hole at least partially forming the inner wall surface (141) of the main hole. CLs) has a main inclined structure (32) that is inclined with respect to the center line of the auxiliary hole,
The air blowing device according to any one of claims 1 to 9, wherein the vortex suppressing structure includes the main inclined structure.
The blow-out portion is a main flow guide (38) for guiding the air flow flowing along the inner wall surface (181) forming the main flow path to the main flow path (18) through which the air flow blown out from the main hole is downstream. Contains
The air blowing device according to claim 1, wherein the vortex suppressing structure includes the main flow guide.
The auxiliary hole has a tangent line (TLs) extending along the inner wall surface of the auxiliary hole at least partially forming the inner wall surface (221) of the auxiliary hole. CLm) having an auxiliary inclined structure (34) that is inclined with respect to the center line of the main hole,
The air blowing device according to any one of claims 1 to 11, wherein the vortex suppressing structure includes the auxiliary inclined structure.
The blow-out section includes an auxiliary flow path (24) that allows an air flow blown out of the auxiliary hole to pass therethrough, and an auxiliary guide that guides an air flow that flows along an inner wall surface (241) that forms the auxiliary flow path to an outlet downstream of the main hole ( 39),
The air blowing device according to any one of claims 1 to 7, wherein the vortex suppressing structure includes the auxiliary guide.
The blowout part has a superposition structure (36) in which a part of the main hole and at least a part of the auxiliary hole overlap each other in the circumferential direction centering on the center line (CLm) of the main hole. ,
The air blowing device according to any one of claims 1 to 10, wherein the vortex suppressing structure includes the superposed structure.
The main hole has a plurality of edges (142a to 142h) forming an opening edge of the main hole,
15. The plurality of edges according to any one of claims 1 to 14, wherein edges having different curvatures are adjacent to each other and are connected in an annular shape so that a connecting portion of the adjacent edges has a roundness. Air blowing device.
An air blowing device,
It has a blowout part (10) that blows out airflow,
The blowout part includes at least one main hole (14) for blowing out an airflow serving as a working airflow,
The main hole has a plurality of edges (142a to 142h) forming an opening edge of the main hole,
The plurality of the edge portions are air blowing devices in which the edge portions having different curvatures are adjacent to each other, and the connection portions of the adjacent edge portions are connected so as to have a roundness.
The blow-out portion includes at least one auxiliary hole (22) that is formed around the main hole and blows out a support airflow for suppressing an air drawing action by the working airflow blown out of the main hole. Item 17. The air blowing device according to Item 16.
The air blowing device according to any one of claims 15 to 17, wherein the main hole is configured by two types of the edge portions having different curvatures.
The air blowing device according to any one of claims 15 to 18, wherein the main hole includes four edge portions, and the four edge portions are connected at four positions.