JP5287549B2 - Air conditioner indoor unit - Google Patents

Description

  The present invention relates to an indoor unit of an air conditioner.

  An indoor unit of an air conditioner has a front panel provided with a suction port for sucking indoor air, a heat exchanger for heat exchange between air sucked from the suction port and a refrigerant, and a plurality of blades. And a fan that sucks and blows out air that has been heat-exchanged by the heat exchanger. In such an indoor unit of an air conditioner, there is a problem of suppressing noise generated at a position where air flows from the heat exchanger to the fan.

  In a conventional air conditioner indoor unit, noise generation at the fan inflow position is suppressed by changing the wind speed at the fan inflow portion in the fan axial direction and changing the sound generation timing at the fan inflow portion. For this purpose, the suction area of the suction opening of the front panel, the lattice angle of the horizontal lattice of the front panel, the fin pitch of the heat exchanger, or the distance between the heat exchanger and the fan is changed in the fan axial direction. . (For example, refer to Patent Document 1).

JP-A-2005-76952 (2nd to 6th pages, FIG. 1)

However, in the indoor unit of the air conditioner described in Patent Document 1, the suction area of the suction port of the front panel, the fin pitch of the heat exchanger, or the distance between the heat exchanger and the fan is changed in the fan axial direction. The pressure loss of the air flow path increases, and the power efficiency of the air conditioner decreases. In order to improve the design, in an air conditioner indoor unit in which the front panel is not provided with a lattice-shaped suction port but a lower end is provided with a suction port, the lattice angle of the horizontal lattice can be changed in the fan axis direction. Can not.
An object of the present invention is to reduce noise while suppressing deterioration of power efficiency in an indoor unit of an air conditioner provided with a suction port at a lower end portion of a front panel.

An indoor unit of an air conditioner according to the present invention is an air conditioner provided with an impeller that rotates around an axis and has a plurality of blades in the circumferential direction, and a heat exchanger provided on the upstream side of the impeller. An indoor unit having an upper suction port for sucking air and having a top panel provided on the upper surface of the indoor unit, and a front surface having a lower suction port for sucking air at the lower end and provided on the front surface of the indoor unit A rib that extends in such a manner that the position in the height direction differs in the axial direction of the impeller, and a front panel, and a support panel provided between the top panel and the front panel and the heat exchanger. The rib is provided between the panel and the support panel, and the rib is curved in the axial direction .
An indoor unit of an air conditioner according to the present invention includes an impeller that rotates around an axis and has a plurality of blades in the circumferential direction, and a heat exchanger provided on the upstream side of the impeller. An indoor unit of the apparatus having an upper suction port for sucking air and provided on the upper surface of the indoor unit, and a lower suction port for sucking air at the lower end and provided on the front surface of the indoor unit. A front panel, a top panel and a support panel provided between the front panel and the heat exchanger, and a rib extending so that a position in a height direction differs in an axial direction of the impeller The rib is provided between the front panel and the support panel, and the rib is inclined with respect to the axial direction.
An indoor unit of an air conditioner according to the present invention includes an impeller that rotates around an axis and has a plurality of blades in the circumferential direction, and a heat exchanger provided on the upstream side of the impeller. An indoor unit of the apparatus having an upper suction port for sucking air and provided on the upper surface of the indoor unit, and a lower suction port for sucking air at the lower end and provided on the front surface of the indoor unit. A front panel, a top panel and a support panel provided between the front panel and the heat exchanger, and a rib extending so that a position in a height direction differs in an axial direction of the impeller Provided between the front panel and the support panel, the rib is V-shaped.

  According to the indoor unit of the air conditioner of the present invention, in the indoor unit of the air conditioner provided with a suction port at the lower end of the front panel, the indoor unit of the air conditioner that reduces noise while suppressing deterioration of power efficiency. Machine can be provided.

It is sectional drawing in a surface perpendicular | vertical to the axial direction of the impeller in the indoor unit of the air conditioning apparatus by Embodiment 1 of this invention. It is the perspective view which looked at the front panel in the indoor unit of the air conditioning apparatus by Embodiment 1 of this invention from the back side. It is the perspective view which looked at the other example of the front panel in the indoor unit of the air conditioning apparatus by Embodiment 1 of this invention from the back side. It is a figure which shows the frequency characteristic of the noise of the air conditioning apparatus by Embodiment 1 of this invention and the conventional air conditioning apparatus. It is a figure which shows the relationship between the rib length ratio and the prevailing sound pressure level in the indoor unit of the air conditioning apparatus by Embodiment 1 of this invention. It is sectional drawing in a surface perpendicular | vertical to the axial direction of the impeller in the indoor unit of the air conditioning apparatus by Embodiment 2 of this invention. It is sectional drawing in a surface perpendicular | vertical to the axial direction of the impeller in the indoor unit of the air conditioning apparatus by Embodiment 3 of this invention.

Embodiment 1 FIG.
1 is a cross-sectional view taken along a plane perpendicular to the axial direction of an impeller in an indoor unit of an air-conditioning apparatus according to Embodiment 1 of the present invention. Moreover, FIG. 2 is the perspective view which looked at the front panel in the indoor unit of the air conditioning apparatus by Embodiment 1 of this invention from the back side. In the drawings, the same reference numerals are the same or equivalent, and this is common throughout the entire specification.

  In FIG. 1, an indoor unit 1 of an air conditioner provided indoors includes a casing 3 provided on the back side, a stabilizer 4 provided on the front side, and an impeller provided between the casing 3 and the stabilizer 4. 2 is provided. The impeller 2 includes a plurality of disk-shaped support plates 6 provided at both ends and in the axial direction, and a plurality of blades 7 provided at a predetermined pitch in the circumferential direction on the outer peripheral side of the support plate 6. It is installed in the indoor unit 1 so as to be rotatable around.

  On the upstream side of the impeller 2, heat exchangers 13 and 14 for exchanging heat between the air and the refrigerant are provided, and a plurality of fins provided in the axial direction of the impeller 2 and the fins are penetrated. And a heat transfer tube through which the refrigerant flows. In the indoor unit 1 shown in FIG. 1, the heat exchangers 13, 14 include a front side heat exchanger 13 provided on the front side and a back side heat exchanger 14 provided on the back side. It is arranged in an inverted V shape so as to cover the upstream side.

  The upper panel 11 provided on the upper surface of the indoor unit 1 has a bar-like or grid-like opening as the upper inlet 12 for sucking air. A front panel 8 is provided on the front side of the indoor unit 1 from the upper end to the front side of the impeller 2, and between the upper panel 11 and the heat exchangers 13 and 14 and between the front panel 8 and the front side heat exchanger 13. A support panel 15 is provided between the two. The support panel 15 has a plurality of bar-shaped openings 16, and filters 17 are disposed on the front side and the upper side of the support panel 15.

  The stabilizer 4 is disposed so as to protrude from the lower end of the support panel 15 toward the impeller 2 so as to face the lower portion of the casing 3. The longitudinal directions of the front panel 8, the casing 3, the stabilizer 4, and the top panel 11 are arranged in parallel to the axial direction of the impeller 2, and side wall plates are provided at both ends of the front panel 8, the casing 3, the stabilizer 4, and the top panel 11. The opening surrounded by the casing 3, the stabilizer 4 and the side wall plate constitutes the air outlet 11.

  A rib 10 is provided on the back side of the front panel 8 and between the front panel 8 and the support panel 15 so as to protrude in the direction of the impeller 2 (back side). Although illustration of the impeller 2 is omitted in FIG. 2, hereinafter, the rotational axis direction of the impeller 2 is simply referred to as an axial direction, and the rotational direction of the impeller 2 is simply referred to as a circumferential direction. The front panel 8 is formed with a notch at the lower end, and has a slit-like opening between the stabilizer 4 and the lower suction port 9 for sucking air. The rib 10 is installed on the back side of the front panel 8 from the slightly upper side of the lower suction port 9 toward the impeller 2. In addition, the rib 10 is formed so as to cover the lower suction port 9 in the axial direction (longitudinal direction), and a plane forming the rib 10 is configured to be curved with respect to the axial direction. It extends so that the position in the height direction (the direction of the dotted arrow in FIG. 1) differs in the axial direction.

  In the indoor unit 1 of the air conditioner configured as described above, when the impeller 2 is rotated by the motor, air is sucked from the upper suction port 12 and the lower suction port 13, and the filter 16, the support panel 15, and the heat exchanger Passes 13 and 14 and flows through the impeller 2. At this time, the upper end of the casing 3 extends to the upper suction port side of the impeller 2, and the air flowing through the impeller 2 is guided to the outlet 11 of the indoor unit 1 by the casing 3. ing. The air passes through a space where the casing 3 and the stabilizer 4 are opposed to each other and is blown into the room from the air outlet 11.

  Here, since the rib 10 is installed on the back side of the front panel 8 so as to be curved with respect to the axial direction, it is sucked in from the lower suction port 9 and the upper suction port 12, and on the front side of the impeller 2. The circumferential position where the merged air flows into the impeller 2 changes in the axial direction.

  In general, in the cross flow fan 5, the lowest pressure region is generated in the vicinity of the stabilizer 4 inside the impeller 2. In the case of the indoor unit 1 of the conventional air conditioner in which the lower suction port 9 is installed at the lower end of the front panel 8, the airflow flowing from the lower suction port 9 and a part of the airflow flowing from the upper suction port 12 However, they merge at the front side of the impeller 2 and flow into the impeller 2 as an air current having a high flow velocity. Therefore, since the circumferential position of the impeller 2 into which the airflow with a high flow velocity flows is the same in the axial direction, the simultaneity of the air volume fluctuation and the pressure fluctuation is increased, and discrete frequency noise is generated.

  On the other hand, in the indoor unit 1 of the air conditioner of the present invention, the impeller is provided by installing the rib 10 so that the position in the height direction is different between the front panel 8 and the support panel 15 in the axial direction. Since the circumferential position at which the air flow having a high flow velocity merged on the front side of 2 flows into the impeller 2 changes in the axial direction, the simultaneity of the air volume fluctuation and the pressure fluctuation is weakened, and the generation of discrete frequency noise can be suppressed. it can. Moreover, in the indoor unit 1 of the air conditioning apparatus shown in Embodiment 1 of the present invention, since the pressure loss of the air flow path is not increased, noise is reduced while suppressing deterioration of power efficiency. Can do. Furthermore, since the areas of the lower suction port 13 and the upper suction port 12 are constant in the axial direction, noise can be reduced without causing deterioration in power efficiency due to the reduction of the suction area.

FIG. 3 is a perspective view of another example of the front panel in the indoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention, viewed from the back side.
In the front panel 8 shown in FIG. 3A, the ribs 10 are arranged such that the plane is inclined with respect to the axial direction. Further, in the front panel 8 shown in FIG. 3B, the rib 10 is arranged in a V shape so that the height direction position is the lowest at the center in the axial direction. Furthermore, in the front panel 8 shown in FIG. 3C, the rib 10 is arranged in an inverted V shape so that the height direction position is the highest at the center in the axial direction. The rib 10 may have any shape that can change the circumferential position where the flow velocity of the high velocity combined at the front surface of the impeller 2 flows into the impeller 2 in the axial direction. Therefore, the shape of the rib 10 is limited to these. It is not something.

  Since the noise reduction effect in the indoor unit 1 of the air-conditioning apparatus according to Embodiment 1 has been confirmed by a test, it will be described below. FIG. 4 is a diagram showing the frequency characteristics of noise in the air conditioner according to Embodiment 1 of the present invention and the conventional air conditioner without ribs, and the noise measurement position is 1 m from the center surface of the indoor unit. The position is 0.8 m away downward. FIG. 4 (a) shows the frequency characteristics of noise of an air conditioner without conventional ribs, and FIG. 4 (b) shows the frequency characteristics of noise of the air conditioner according to Embodiment 1 of the present invention. is there.

  As shown in FIG. 4, the noise of the conventional air conditioner in which the rib 10 is not installed is at a frequency corresponding to the product NZ of the rotational speed N of the impeller 2 and the number of blades Z of the crossfoil impeller 2. The frequency characteristics have a strong peak. On the other hand, the frequency characteristics of the noise of the air conditioner 1 of the present invention in which the ribs 10 are bent in the axial direction do not show a strong peak at a frequency corresponding to NZ, and are unpleasant audibly. There is no rotating sound. In addition, it confirmed that the same effect was acquired also in the air conditioning apparatus which has the rib 10 of the shape shown to Fig.3 (a), FIG.3 (b), and FIG.3 (c).

  Further, the influence of the length of the rib 10 in the depth direction of the indoor unit 1 was confirmed by a test, and will be described below. FIG. 5 is a diagram showing the relationship between the rib width and the prevailing sound pressure level in the indoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. In FIG. 5, the horizontal axis is a rib length ratio h / H, which is the ratio of the length h in the depth direction of the rib 10 to the width H of the air path between the front panel 8 and the filter 16, and the vertical axis is The sound pressure level at the frequency corresponding to NZ when the rib 10 is not present (the sound pressure level) is 1, and the sound pressure level is normalized.

  As shown in FIG. 5, by setting the rib length ratio h / H to 0.55 or more, the prevailing sound pressure level can be approximately halved. Therefore, in order to obtain a rotating sound reduction effect, the rib length ratio h / H is desirably 0.55 or more.

  In addition, the position of the height direction of the rib 10 should just be not the same height in the axial direction, and as shown in FIG. 2, the position of the same height may exist in an axial direction. Therefore, the rib 10 may have a shape that periodically repeats a V shape, an inverted V shape, and a wave shape other than those shown in FIGS. 2 and 3. Further, the rib 10 may be molded integrally with the front panel 8 or may be attached after being molded as a separate body.

Embodiment 2. FIG.
FIG. 6 is a cross-sectional view taken along a plane perpendicular to the axial direction of the impeller in the indoor unit of the air-conditioning apparatus according to Embodiment 2 of the present invention.
As shown in FIG. 6, the rib 10 of the indoor unit 1 of the air-conditioning apparatus according to Embodiment 2 of the present invention has a root portion coupled to the front panel 8 formed in an arc shape. Other configurations and functions are the same as those of the indoor unit 1 of the air-conditioning apparatus according to Embodiment 1, and the rib 10 is arranged such that the position of the indoor unit 1 in the height direction (the direction of the dotted arrow in FIG. 6) differs in the axial direction. Extend to.

  By forming the base portion of the rib 10 connected to the front panel 8 in an arc shape, the airflow flowing in from the upper suction port 12 and the airflow flowing in from the lower suction port 9 are smoothly bent in the direction of the impeller 2 and pressure loss is reduced. descend. Moreover, since the root part couple | bonded with the front panel 8 of the rib 10 is formed in circular arc shape, and a root part is thick compared with the front-end | tip part, intensity | strength improves.

Embodiment 3 FIG.
FIG. 7 is a cross-sectional view taken along a plane perpendicular to the axial direction of the impeller in the indoor unit of the air-conditioning apparatus according to Embodiment 3 of the present invention.
In the indoor unit 1 of the air conditioner according to Embodiment 1 and Embodiment 2, the rib 10 is attached to the front panel 8, but the rib 10 may be attached to the filter 16 or the support panel 15 as shown in FIG. In the indoor unit 1 of the air conditioning apparatus according to the third embodiment, the other configurations and functions are the same as those of the indoor unit 1 of the air conditioning apparatus according to the first or second embodiment, and the rib 10 is the same as that of the indoor unit 1. It extends so that the position in the height direction (the direction of the dotted arrow in FIG. 7) is different in the axial direction.

  In the configuration in which the ribs 10 are installed on the back surface of the front panel 8 as shown in FIG. 1, when the front panel 8 is molded from resin, sink marks may occur on the surface of the front panel 8 and the design may be deteriorated. As shown in the third embodiment, when the rib 10 is attached to the filter 16 or the support panel 15, there is no sink on the surface of the front panel 8, so that an effect that the designability does not deteriorate is obtained. be able to.

  DESCRIPTION OF SYMBOLS 1 Indoor unit, 2 impeller, 3 casing, 4 stabilizer, 5 crossflow fan, 6 support plate, 7 blades, 8 front panel, 9 lower suction port, 10 rib, 11 upper surface panel, 12 upper suction port, 13, 14 Heat exchanger, 15 support panels, 16 openings, 17 filters.

Claims (6)

An air conditioner indoor unit comprising an impeller that rotates around an axis and has a plurality of blades in the circumferential direction, and a heat exchanger provided on the upstream side of the impeller,
An upper panel provided on the upper surface of the indoor unit having an upper suction port for sucking air;
A front panel provided at the front of the indoor unit having a lower suction port for sucking air at the lower end,
A support panel provided between the top panel and the front panel and the heat exchanger;
A rib extending so that a position in the height direction differs in the axial direction of the impeller is provided between the front panel and the support panel,
The indoor unit of an air conditioner , wherein the rib is curved in the axial direction . An air conditioner indoor unit comprising an impeller that rotates around an axis and has a plurality of blades in the circumferential direction, and a heat exchanger provided on the upstream side of the impeller,
An upper panel provided on the upper surface of the indoor unit having an upper suction port for sucking air;
A front panel provided at the front of the indoor unit having a lower suction port for sucking air at the lower end,
A support panel provided between the top panel and the front panel and the heat exchanger;
A rib extending so that a position in the height direction differs in the axial direction of the impeller is provided between the front panel and the support panel,
The ribs, the indoor unit of the air conditioner you characterized in that it is disposed inclined with respect to the axial direction. An air conditioner indoor unit comprising an impeller that rotates around an axis and has a plurality of blades in the circumferential direction, and a heat exchanger provided on the upstream side of the impeller,
An upper panel provided on the upper surface of the indoor unit having an upper suction port for sucking air;
A front panel provided at the front of the indoor unit having a lower suction port for sucking air at the lower end,
A support panel provided between the top panel and the front panel and the heat exchanger;
A rib extending so that a position in the height direction differs in the axial direction of the impeller is provided between the front panel and the support panel,
The ribs, the indoor unit of the air conditioner you being a V-shape. The indoor unit of an air conditioner according to any one of claims 1 to 3, wherein the rib is provided on the front panel. 4. The air conditioner according to claim 1, wherein the rib is provided on a filter provided between the support panel and the front panel or on the support panel. 5. Indoor unit. The indoor unit of an air conditioner according to any one of claims 1 to 5 , wherein the rib is formed in an arc shape in a cross section perpendicular to the axial direction of the impeller.

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