JP2011169295A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower in which the noise due to fluctuation of pressure of an adjacent impeller can be reduced. <P>SOLUTION: The blower includes a box-shaped casing 1 having a plurality of air ducts 4 arranged side by side in a first direction, a common inlet port 21 common to the each air duct 4, formed on a back face to extend in the first direction, and a common outlet port 3 common to the each air duct 4, extending in the first direction on an opposing front face; an axial flow impeller 5 arranged in each air duct 4 to generate airflow flowing from the common inlet port 21 to the common outlet port 3; and an electric motor 6 driving the axial flow impeller 5. The airflows drawn in at the common inlet port 21 and circulated through air ducts 4 are joined at the common outlet port 3 and discharged in a belt-like form. The common inlet port 21 is partitioned by a partition plate 12 provided between air duct inlet ports 2 of the plurality of air ducts 4 arranged side by side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a blower that includes a plurality of impellers arranged side by side and is installed on a ceiling surface or a wall surface in a building to release a strip-shaped airflow into a free space.

  According to the blower that generates such a belt-like airflow, a plurality of air passages and impellers provided in the air passages are provided side by side in an elongated box-like housing. One large suction port and one large air outlet that are shared by each air passage are formed.

JP-A-6-313603

  As described above, the air flow interferes with each other in the blower provided with a plurality of air passages and the impellers provided in the air passages side by side, and the suction opening provided in common in each air passage, and adjacent blades In some cases, noise such as an annoying beating occurs due to the interference of the rotational noise of the impeller caused by the pressure fluctuation of the car. Particularly in the axial flow impeller, the rotating directions of the impellers are opposite to each other in adjacent portions, which is remarkable.

  The present invention has been made in view of the above, and in a blower in which a plurality of air passages and impellers provided in the air passages are arranged side by side, noise caused by pressure fluctuations of adjacent impellers It aims at providing the air blower which can reduce.

  In order to solve the above-described problems and achieve the object, the blower of the present invention has a box shape and a plurality of air passages penetrating from the back side to the front side are formed side by side in the first direction. A common suction port common to each air passage is formed on the back surface extending in the first direction, and a common air outlet common to each air passage is formed on the opposite front surface so as to extend in the first direction; An air flow that is arranged in each air passage and generates an air flow from the common suction port to the common air outlet, and an electric motor that drives the impeller, and flows through each air passage from the common suction port. Are blown together in a common air outlet and discharged in a strip shape, and the common air inlet is partitioned by a partition plate installed between the air inlets of the air passages formed in a row. Features.

  According to the blower of the present invention, since the common suction port is partitioned by the partition plate provided between the air passage suction ports of the air passages formed side by side, the suction flow between the impellers is rectified and interference noise is generated. Prevent occurrence.

FIG. 1 is a front view of an embodiment of a blower according to the present invention. FIG. 2 is a cross-sectional view of the blower. FIG. 3 is a rear view of the blower partly broken along the BB cross section of FIG. 2. FIG. 4 is a perspective view of the blower as seen from the back side. FIG. 5 is an enlarged perspective view of a portion A in FIG. FIG. 6 is a schematic diagram when the blower is used for air conveyance. FIG. 7 is a schematic diagram when a blower is used for circulation. FIG. 8 is a schematic diagram when the blower is used for cool air. FIG. 9 is a schematic diagram when a blower is used for an air curtain.

  Hereinafter, embodiments of a blower according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
According to the present embodiment, a low noise blower can be obtained by providing a silencer structure in a flow path in a blower that discharges a band-shaped air flow into a free space. Also, even when trying to improve the reach performance of the air flow by increasing the rotation speed of the impeller, the noise generated from the impeller is increased, but the noise propagated outside the blower by using the present invention It can be reduced.

  FIG. 1 is a front view of an embodiment of a blower according to the present invention. FIG. 2 is a cross-sectional view of the blower. FIG. 3 is a rear view of the blower partly broken along the BB cross section of FIG. 2. FIG. 4 is a perspective view of the blower as seen from the back side. FIG. 5 is an enlarged perspective view of a portion A in FIG.

  The blower 100 includes an elongated box-shaped casing 1 that forms an outer shell, and a plurality of blower units 80 that are arranged in the casing 1. The casing 1 has an elongated rectangular parallelepiped box shape, and five bell mouth-like air passages 4 are arranged at equal intervals in the first direction so as to penetrate from the rear surface of the casing 1 to the front surface (from upstream to downstream). Is formed. In each air passage 4, an axial flow impeller (impeller) 5 and an electric motor 6 that drives the axial flow impeller 5 are arranged in this order from the back side. The bell mouth-shaped air passage 4, the axial flow impeller 5, and the electric motor 6 constitute one blower unit 80 (FIG. 2).

  A suction port (common suction port) 21 is formed on almost the entire surface of the housing 1 on the back side of the housing 1 (the suction port 21 extends in the first direction). On the other hand, on the front side of the casing 1, an elongated elongated outlet (common outlet) 3 is formed that is divided into two stages over almost the entire length of the casing 1 (the outlet 3 is the first outlet). Extending in the direction). The suction port 21 and the air outlet 3 are formed in common for each air passage 4. A flat plate-like silencer (suction-side silencer) 9 is erected in a rectangular frame shape along the outer peripheral portion of the rear-side end surface 1 a of the housing 1, and the suction port 21 has a frame-like silencer. It is formed inside the material 9. That is, the rear side end face 1a of the housing 1 exists at a position recessed from the suction port 21 by the height of the silencer 9. And the air-path suction inlet 2 which is the circular opening of the bell mouth-shaped air path 4 is formed in the back side end surface 1a inside the silencer 9 along with it. The position of the rear-side end surface 1a is a position that is recessed 50 mm inside from the outer end of the sound deadening material 9. As described above, the axial-flow impeller 5 and the electric motor 6 are arranged in this order in the air passage 4 leading from the air passage inlet 2 to the outlet 3. The tip of the axial flow impeller 5 is located 10 mm downstream from the air passage inlet 2.

  The suction port 21 is covered with a lattice-shaped protective guard 8. The protective guard 8 is installed to prevent intrusion of foreign matter into the air passage 4, prevention of injury due to a finger or the like coming into contact with the blade, and prevention of scattering when a component such as a blade is removed. The protective guard 8 according to the present embodiment is formed in a lattice shape with wires. However, the protective guard 8 is not limited to this, and may be made of a material that allows only airflow, such as a net or punching metal.

  And the partition plate 12 is standingly arranged by the back side end surface 1a so that the adjacent air path suction inlet 2 may be partitioned off. That is, the partition plate 12 is erected so as to divide the plate-shaped space formed between the protective guard 8 and the rear-side end surface 1 a over the entire back surface of the housing 1 for each air passage 4. The partition plate 12 is made of a sound deadening material and is erected at the center of the adjacent air passage inlet 2. The partition plate 12 is provided on the inner side of the silencer 9 in order to make the adjacent air passages 4 independent from each other and prevent interference of the suction flow. The partition plate 12 partitions the periphery of the circular air passage inlet 2 together with the sound deadening material 9 into a rectangular space. The partition plate 12 does not cover the R chamfered portion 19 formed over the entire circumference at the opening edge of the air passage suction port 2 that is the inlet of the bell mouth-shaped air passage 4, and the outermost diameter portion of the R chamfered portion 19 It is erected so that it touches.

  The air passage 4 is formed in an inclined shape that gradually narrows the cross-sectional area from the air passage inlet 2 to the outlet 3 toward the center in the vertical direction of the housing 1 and uniformly narrowing the center of the axial flow impeller 5. Yes. And the flow path 4 is comprised by the silencer in the part which contact | connects the fluid of an inner wall surface. The motor holding part 15 that holds the electric motor 6 is integrated with the air passage 4, and the part that is in contact with the fluid on the inner wall of the flow path except for the part that is necessary for securing the strength to maintain the shape with the electric motor holding part 15. Consists of silencer.

  A guide 7 having a substantially triangular cross section is disposed on the downstream side of the electric motor 6 with the convex portion facing the electric motor 6 side. The guide 7 divides the airflow that has passed through the air passage 4 into two in the vertical direction. The guide 7 may be made of a sound deadening material.

  Further, the silencer 11 at the air outlet central part is installed further downstream of the guide 7. Further, a rectangular frame-shaped silencer (blower outlet silencer) 13 is provided on the front side end face of the casing 1 along the outer periphery, and the blower outlet central part silencer 11 is a rectangular frame-shaped silencer. A central portion of the material 13 extends over the entire length of the housing 1 and the sound deadening material 13 and a blowout port 3 having a two-stage elongated hole are formed. The joint between the blower outlet central part silencer 11 and the guide 7 is formed smoothly without a step so as not to disturb the air flow F flowing through the air passage 4. In addition, in order to prevent the blower outlet center silencer 11 from being bent downward due to gravity, the blower outlet center silencer reinforcing material 14 is embedded in the vertical center part of the blower center silencer 11. Yes.

  The blower 100 configured as described above is attached to a ceiling, a wall surface, or the like by attachment feet 10 provided at both ends of the housing 1 (FIG. 4). As indicated by arrows in FIG. 2, the air flow F enters the blower 100 through the gaps in the slits of the protective guard 8, passes through the suction ports 21, and enters the respective air passages 4 from the respective air passage suction ports 2. It moves in the air passage 4 by the axial flow impeller 5 and is released into the free space as a belt-like air current from the long and slender air outlet 3 that is divided vertically by the guide 7 and formed in two stages. . The purpose of circulation etc. is achieved by the released airflow.

  As mentioned above, the blower outlet 3 is an elongate hole divided into two by the blower outlet central part silencer reinforcing material 14, and two are arranged in parallel in the vertical direction of the main body. The blower outlet 3 joins the airflow which blows off from the exit of each wind path 4, and forms a strip | belt-shaped airflow. The silencer 13 and the silencer 11 at the air outlet center part also play a role as a nozzle for improving the airflow arrival performance by extending the straight portion of the air passage 4 in the vicinity of the air outlet 3. In addition, by providing the silencer 13 on the air outlet side, the rectifying action also acts on the suction port side to double the silence effect on the suction port side.

  The airflow blown out from the blower 100 has an average wind speed of 5 to 13 m / s, and an airflow of 0.3 m / s can be reached 10 to 50 m ahead. The wind speed and the airflow arrival distance are determined by the diameter of the axial flow impeller 5 and the output of the electric motor 6.

In the present embodiment, a sound-absorbing material having a sound-absorbing property equivalent to a glass wool density of 48 kg / m ³ is used. In addition to the sound deadening material, non-woven fabric, pet resin, and the like can also be used.

  FIG. 6 is a schematic diagram showing a state in which the blower 100 of the present embodiment is installed. For example, as shown in FIG. 6, the blower 100 is installed on a ceiling surface or a wall surface in a building, and fresh outside air taken into the room by a ventilation fan 17 installed on one wall surface is used as an air flow F1 on the opposite side. It is used for transporting toward the exhaust fan 17 for exhausting the wall of the wall.

  FIG. 7 is a schematic diagram showing a state where the blower 100 is installed in another form for other purposes of use. As shown in FIG. 7, the blower 100 is installed on a ceiling surface or a wall surface in a building, and is used as a circulation for stirring the air-conditioned airflow F2 blown out from the air conditioner 18 over the entire room.

  FIG. 8 is a schematic view showing a state where the blower 100 is installed in another form for another purpose of use. As shown in FIG. 8, the blower 100 is installed on a ceiling surface or a wall surface, and is used as a blower that gives a cool air feeling by applying an air flow F <b> 3 to a person in the room.

  FIG. 9 is a schematic diagram showing a state in which the blower 100 is installed in another form for another purpose of use. As shown in FIG. 9, the blower 100 is installed as an upward horizontal frame of a three-sided frame such as a doorway of a building, and is used as an air curtain that blocks the flow of air inside and outside the doorway by a zonal airflow F4 that blows out.

  As described above, the present embodiment realizes low noise by rectifying the suction flow of adjacent impellers and preventing the generation of interference noise. At this time, the positional relationship between the axial flow impeller 5 and the bell mouth-shaped air passage inlet 2 is changed, the cylindrical portion at the upstream end of the air passage 4 is extended to the protective guard 8 side, and the air passage inlet 2 and the axial air vane are extended. When considering to prevent the generation of interference sound by securing a distance that can rectify the suction flow between the cars 5, the suction area becomes the area of the cylindrical portion, and the suction area is greatly reduced compared to the case where rectification is not performed. . Therefore, the flow velocity of the flowing air flow increases, and fluid noise increases, which is not preferable.

  On the other hand, according to the blower 100 of the present embodiment, the partition plate 12 is erected on the rear side end surface 1a that forms the air passage suction port 2 to thereby draw the suction flow between the adjacent axial flow impellers 5. By rectifying, it is possible to prevent generation of noise such as annoying beating due to interference of impeller rotational noise due to pressure fluctuation between adjacent impellers, and the suction area is also greatly reduced compared to the case without the partition plate 12. There is nothing. Therefore, there is little increase in fluid noise due to an increase in flow velocity. Also, there is an effect of reducing fluid noise due to a decrease in the flow velocity of the airflow passing through the protective guard 8. The R chamfered portion 19 suppresses the separation of the airflow at the portion where the flow path area changes. Such an effect contributes to noise reduction of the blower.

  Furthermore, according to the present embodiment, when the partition plate 12 is made of a sound deadening material, it can be made of a rectangular sound deadening material. The material can be easily manufactured.

  The blower of the present invention includes a plurality of impellers arranged side by side, and is suitable for a blower that is installed on a ceiling surface or a wall surface in a building and discharges a strip-shaped airflow into a free space. It is the best for the blower installed in the quiet installation place.

DESCRIPTION OF SYMBOLS 1 Housing | casing 1a Back side end surface of a housing | casing 2 Air path inlet 3 Air outlet (common outlet)
4 Airway 5 Axial flow impeller (impeller)
6 Motor 7 Guide 8 Protective Guard 9 Suction-side Silencer 10 Mounting Feet 11 Blowout Center Silencer 12 Partition Plate 13 Blowout Silencer 14 Blower Center Silencer Reinforcing Material 15 Motor Holder 19 R Chamfer 21 Suction port (common suction port)
100 blower

Claims (5)

A plurality of air passages that are box-shaped and penetrate from the back side to the front side are formed side by side in the first direction, and a common suction port common to each air passage extends on the back side in the first direction. A casing formed in the front surface and formed in common with each air passage extending in the first direction, and a common air outlet provided in each air passage from the common suction port to the common air outlet. An impeller that generates an air flow toward the outlet and an electric motor that drives the impeller, and the air flow sucked in from the common suction port is merged at the common blowout port and discharged in a band shape. A blower,
The blower, wherein the common suction port is partitioned by a partition plate provided between a plurality of the air passage suction ports formed side by side. The blower according to claim 1, wherein the common suction port is partitioned by the partition plate into a rectangle surrounding the circular air passage suction port. The blower according to claim 1 or 2, wherein at least a surface of the partition plate facing the air passage inlet is made of a sound deadening material. The blower according to any one of claims 1 to 3, wherein the impeller is an axial-flow impeller.   The blower according to any one of claims 1 to 4, wherein a silencer that rectifies and silences the combined airflow is provided at the common air outlet.

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