JP2016164468A - Outdoor unit for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce fan noise by a simple and cheap constitution, while enhancing air conditioning performance by increasing an area of a heat exchanger, by extending the heat exchanger installed on a back side of a housing to the rear side of a machine chamber.SOLUTION: An outdoor unit 1A includes: a box-shaped housing 2; a machine chamber 6 provided on one side in a width direction inside the housing 2; a fan 7 provided on the other side in the width direction inside the housing 2, and for blowing the outside air toward a front side from the back side of the housing 2; a heat exchanger 10 installed so as to extend from the back side of the fan 7 to the back side of the machine chamber 6, along the back surface of the housing 2; and a flow speed restriction plate 15A provided in a range from a peripheral wall surface 6a of the machine chamber 6 in a plan view to a center part of the fan 7 on an upstream side of the fan 7, and for restricting a flow speed of an airflow flowing from the back side of the machine chamber 6 to the fan 7 side. The flow speed restriction plate 15A has a tabular shape having a surface direction orthogonal to an axial direction of the fan 7, one end of it is fixed to the machine chamber 6, and the other end is fixed to a motor deck 7d of the fan 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an outdoor unit for an air conditioner that applies heat from a fan to a heat exchanger to exchange heat with a refrigerant.

  As described in FIG. 3 of Patent Document 1, for an air conditioner in which a heat exchanger is installed in an L shape from one side to the back of a box-shaped housing and a fan is installed inside the housing. There is an outdoor unit. Outside air was sucked in from the back and side surfaces of the housing by the fan, and this outside air was opened at the front of the housing after heat exchange with the refrigerant flowing inside the heat exchanger by passing through the heat exchanger. It is discharged from the air outlet.

  The interior of the housing is partitioned into a heat exchange chamber and a machine room by a partition wall, a heat exchanger and a fan are installed in the heat exchange chamber, and devices such as a compressor are installed in the machine room. A portion of the heat exchanger on the rear side of the casing extends from the rear area of the fan to the rear area of the machine room.

JP 2004-211931 A

In order to increase the area of the heat exchanger and improve the air conditioning performance, it is desirable to extend the heat exchanger completely to the rear side (back side) of the machine room.
However, in this case, since the peripheral wall of the machine room is curved so as to protrude toward the fan side, the flow that flows around the peripheral wall of the machine room out of the air flow passing through the heat exchanger and flowing into the fan is This causes a problem that the flow velocity is increased and the flow velocity of the fan collides with the blades of the fan to increase the noise (fan noise) of the fan.
As for the noise from the outdoor unit, the operating noise of the compressor and the noise of the fan occupy approximately the same ratio, and the noise reduction of the fan is effective for further noise reduction.

  The present invention has been made in view of such circumstances, and the heat exchanger installed on the back side of the casing is extended to the rear side of the machine room, thereby increasing the area of the heat exchanger and improving the air conditioning performance. An object of the present invention is to provide an outdoor unit for an air conditioner that can reduce fan noise with a simple and inexpensive configuration.

  In order to solve the above problems, the present invention employs the following means.

  That is, the outdoor unit for an air conditioner according to the first aspect of the present invention includes a box-shaped housing, a machine room provided on one side in the width direction inside the housing, and a width inside the housing. A fan that is provided on the other side of the direction and blows outside air from the back side of the casing toward the front side, and extends along the back side of the casing and from the back side of the fan to the back side of the machine room A heat exchanger installed so as to be provided on the upstream side of the fan in a range from the peripheral wall surface of the machine room to the center of the fan in a plan view, from the back side of the machine room to the fan side And a flow rate limiting plate for limiting the flow rate of the airflow flowing through the airflow.

  According to the outdoor unit for an air conditioner having the above-described configuration, the heat of the refrigerant flowing through the heat exchanger by sucking the air on the back and side surfaces of the housing and passing through the heat exchanger as the fan rotates. After the replacement, the air is exhausted from the air outlet opened in front of the housing by the rotation of the fan.

  Of these, the air that has passed through the heat exchanger on the back side of the machine room is compressed by the peripheral wall surface of the machine room, so it tries to flow into the fan side as a high-speed flow, but before it reaches the fan, The speed is limited by a flow rate limiting plate provided on the upstream side of the fan. For this reason, it is suppressed that the high-speed flow that circulates around the peripheral wall surface of the machine room hits the blades of the fan at high speed and generates noise.

  Therefore, the fan noise can be reduced by a simple and inexpensive configuration in which the heat exchanger is extended to the rear region of the machine room, the area of the heat exchanger is increased to improve the air conditioning performance, and the flow rate limiting plate is provided. it can.

  In the above configuration, the flow rate limiting plate may be a flat plate having a surface direction orthogonal to the axial direction of the fan. Thereby, the flow rate limiting plate can be configured simply and inexpensively.

  In the above configuration, it is conceivable that the flow rate limiting plate has one end fixed to the machine room and the other end fixed to a motor deck that supports the motor of the fan in plan view. Thereby, it is possible to securely fix the flow rate limiting plate and suppress the flow rate limiting plate from being vibrated by the airflow.

  In the above configuration, when the diameter of the fan is D, the flow rate restricting plate is installed 0.1 D or more upstream from the upstream end of the fan.

  As a result, when the air on the back side of the machine room flows to the fan side, the air can be decelerated by the flow rate limiting plate before being compressed by the peripheral wall surface of the machine room to become a high-speed flow. For this reason, generation | occurrence | production of a high-speed flow can be prevented and fan noise can be reduced.

  In the above configuration, when the width of the machine room is L, it is preferable that the flow rate limiting plate protrudes 0.2 L or more from the fan-side end face of the machine room to the fan side.

  In this way, the range in which the flow rate limiting plate is installed is limited to a range where high-speed flow around the peripheral wall of the machine room can be generated, and the flow in the region where high-speed flow does not occur is blocked by the flow rate limiting plate. It is possible to prevent the deterioration of the performance of the heat exchanger.

  In the above-described configuration, the flow rate limiting plate has one end adjacent to the peripheral wall surface of the machine room with a gap in the plan view, the other end facing the blade side of the fan, and the gap You may extend so that a width may become large toward the said blade side from the said machine room side.

  According to the said structure, the high-speed flow which goes around the surrounding wall surface of a machine room flows in into the clearance gap between the surrounding wall surface of a machine room, and the flow-rate restriction | limiting board. Since the gap increases from the machine room side toward the fan blade side, the high-speed flow passing through the gap is decelerated by the diffuser effect. Therefore, fan noise can be reduced with a simple and inexpensive configuration.

  Since the flow rate limiting plate extends obliquely from the peripheral wall surface of the machine room toward the blade side of the fan in plan view, the entire air flow is not disturbed. For this reason, it is possible to prevent the air flow from being disturbed or disturbed in other areas where the high-speed flow does not occur, and to avoid the performance deterioration of the heat exchanger.

  As described above, it is preferable that the flow rate limiting plate disposed obliquely from the peripheral wall surface of the machine room toward the blade side of the fan in a plan view extends in a tangential direction from the peripheral wall surface of the machine room.

  Thereby, the high-speed flow which goes around the surrounding wall surface of a machine room can be smoothly guide | induced to the clearance gap between a surrounding wall surface and a flow-rate restriction board, the flow of airflow can be improved, and the performance of a heat exchanger can be improved.

  In the above configuration, the flow rate limiting plate may be a perforated plate. As a result, a part of the airflow flowing into the fan can pass through the flow rate limiting plate, so that the flow of air is effectively prevented from being obstructed by providing the flow rate limiting plate, and the performance of the heat exchanger A decrease can be avoided.

  An outdoor unit for an air conditioner according to a second aspect of the present invention includes a box-shaped housing, a machine room provided on one side in the width direction inside the housing, a width direction inside the housing, and the like. And a fan that blows outside air from the back side of the casing toward the front side, and extends along the back side of the casing and from the back side of the fan to the back side of the machine room. And a heat-absorbing buffer film provided on the pressure surface side of each blade of the fan.

  According to the outdoor unit for an air conditioner having the above-described configuration, the air that has passed through the heat exchanger located on the back side of the machine room is throttled by the peripheral wall surface of the machine room and becomes a high-speed flow to the blades of the fan. Even in the event of a collision, the momentum of this high-speed flow is attenuated by the elastic buffer film provided on the pressure surface of the blade. Therefore, the generation of a collision sound due to the collision of the high-speed flow with the blade is suppressed, and the fan noise can be reduced with a simple and inexpensive configuration in which a buffer film is provided on the blade.

  In the above configuration, the range in which the buffer film is provided is preferably a range from the tip of the blade to about half. As a result, the range in which the buffer film is provided can be minimized, and the increase in the weight of the fan blade and the influence on the airflow can be minimized.

  As described above, according to the outdoor unit for an air conditioner according to the present invention, the heat exchanger installed on the back side of the casing is extended to the rear side of the machine room, and the area of the heat exchanger is increased to perform air conditioning. Fan noise can be reduced with a simple and inexpensive configuration while improving performance.

It is a front view of the outdoor unit for air conditioners concerning the embodiment of the present invention. It is a cross-sectional view of the outdoor unit for an air conditioner showing the first embodiment of the present invention along the line II-II in FIG. It is a cross-sectional view of the outdoor unit for air conditioners which shows 2nd Embodiment of this invention. It is a cross-sectional view of the outdoor unit for air conditioners showing a third embodiment of the present invention. It is the V section enlarged view of FIG. It is a front view of the outdoor unit for air conditioners which shows 4th Embodiment of this invention. It is a cross-sectional view of the outdoor unit for air conditioners along the VII-VII line of FIG.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a front view of an outdoor unit for an air conditioner (hereinafter referred to as an outdoor unit) according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. The outdoor unit 1A is connected to an indoor unit installed in a room such as a store, an office, or a residence and is installed outside. In the following description, the side visible in FIG. 1 is referred to as the “front” of the outdoor unit 1A, and the opposite side is referred to as the “back” of the outdoor unit 1A.

  The outdoor unit 1A includes a box-shaped housing 2. An air outlet 3 is opened in front of the housing 2, and the back surface and one side surface of the housing 2 are opened as air suction ports 4 a and 4 b. Inside the housing 2, a machine room 6 is installed on one side in the width direction, and a fan 7 is installed on the other side. The machine room 6 contains a number of devices such as a compressor 8 that compresses the refrigerant. The internal space of the housing 2 excluding the machine room 6 is a heat exchange chamber 9.

  The fan 7 is an axial fan including a blade 7a, a fan motor 7b that rotationally drives the blade 7a, a bell mouth 7c that surrounds the blade 7a and smoothes the shape of the air outlet 3, and a motor deck 7d. The fan motor 7b is installed in the housing 2 while being supported by the motor deck 7d. The peripheral wall surface 6 a of the machine room 6 is adjacent to the bell mouth 7 c, and the back surface of the peripheral wall surface 6 a is curved toward the fan 7.

  A heat exchanger 10 is installed in the heat exchange chamber 9 inside the housing 2 along the air inlets 4a and 4b. The heat exchanger 10 includes a long side portion 10a facing the air suction port 4a and a short side portion 10b facing the air suction port 4b, and is formed in a substantially L shape in plan view. The long side portion 10 a extends along the back surface of the housing 2 and extends from the back surface side of the fan 7 to the back surface side of the machine room 6.

  When the fan motor 7b of the fan 7 is actuated, the blade 7a rotates, and outside air is sucked from the air suction ports 4a and 4b on the back and side surfaces of the housing 2, and this outside air passes through the heat exchanger 10 (10a and 10b). Thus, heat exchange with the refrigerant flowing inside the heat exchanger 10 is performed, and then the air is discharged from the air outlet 3 on the front surface of the housing 2. Since the long side part 10a of the heat exchanger 10 extends to the back side of the machine room 6, the area of the heat exchanger 10 can be increased to improve the air conditioning performance.

  On the upstream side (suction side) of the fan 7, a flow rate limiting plate 15 </ b> A that limits the flow rate of the airflow flowing from the back side of the machine room 6 to the fan 7 side is installed. The flow rate limiting plate 15A is, for example, a flat plate having a surface direction orthogonal to the axial direction of the fan 7 (a direction along the long side portion 10a of the heat exchanger 10), and as shown in FIGS. It is provided in a range extending from the peripheral wall surface 6 a of the machine room 6 to the vicinity of the center portion of the fan 7 in view and plan view.

  The flow rate limiting plate 15A is a perforated plate such as a wire mesh, a punching plate, or a plate formed with a large number of slits, and one end thereof is fixed to the peripheral wall surface 6a of the machine chamber 6 in plan view, and the other end is a fan motor 7b. Is fixed to a motor deck 7d. Here, when the diameter of the fan 7 is D, it is preferable that the flow rate limiting plate 15 </ b> A is installed 0.1 D or more upstream from the upstream end of the fan 7.

  In the outdoor unit 1A configured as described above, with the rotation of the fan 7, air is sucked from the back surface (air suction port 4a) and side surface (air suction port 4b) of the housing 2, and this air is a heat exchanger. 10 (the long side portion 10a, the short side portion 10b) is passed through the fan 7 and then opened in the front of the housing 2 after heat exchange with the refrigerant flowing inside the heat exchanger 10 It is discharged from the outlet 3.

  Among these, the air that has passed through the heat exchanger 10 (long side portion 10a) on the back side of the machine room 6 is contracted by the peripheral wall surface 6a of the machine room 6 and thus flows into the fan 7 side as a high-speed flow F. Try to. However, before reaching the fan 7, it is decelerated by the flow rate limiting plate 15A provided on the upstream side of the fan 7. Therefore, the high-speed flow F caused by the contraction by the peripheral wall surface 6a of the machine room 6 does not occur as in the prior art, and such high-speed flow F directly impinges on the blade 7a of the fan 7 and generates noise. Is suppressed.

  For this reason, the long side part 10a of the heat exchanger 10 is extended to the area | region of the rear side of the machine room 6, the area of the heat exchanger 10 is increased, air conditioning performance is improved, and the flow rate limiting plate 15A is provided and is simple and inexpensive. With this configuration, the noise of the fan 7 can be reduced.

  Since the flow rate limiting plate 15A is a flat plate having a surface direction orthogonal to the axial direction of the fan 7, the flow rate limiting plate 15A can be configured simply and inexpensively. Further, since the flat flow rate limiting plate 15A has a simple structure in which one end is fixed to the peripheral wall surface 6a of the machine room 6 and the other end is fixed to the motor deck 7d, the flow rate limiting plate 15A is securely fixed. It is possible to suppress the flow rate limiting plate 15A from vibrating due to the airflow.

  The flow rate limiting plate 15A is installed on the upstream side by 0.1D or more from the upstream end portion of the fan 7 when the diameter of the fan 7 is D. For this reason, when the air on the back side of the machine room 6 flows to the fan 7 side, the flow rate is restricted by the flow rate restricting plate 15A before being compressed by the peripheral wall surface 6a of the machine room 6 to become the high-speed flow F. The Therefore, generation | occurrence | production of the high-speed flow F can be blocked | prevented and the noise of the fan 7 can be reduced effectively.

  Since the flow rate limiting plate 15A is a perforated plate, a part of the airflow flowing into the fan 7 can pass through the flow rate limiting plate 15A. Therefore, the flow of air is inhibited by providing the flow rate limiting plate 15A. Can be effectively prevented, and performance degradation of the heat exchanger 10 can be avoided.

[Second Embodiment]
FIG. 3 is a cross-sectional view of an outdoor unit showing a second embodiment of the present invention.
This outdoor unit 1B is different from the outdoor unit 1A of the first embodiment in the shape and fixing structure of the flow rate limiting plate 15B, and is the same in other parts. Accordingly, the same parts as those of the outdoor unit 1A of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  Like the flow rate limiting plate 15A in the first embodiment, the flow rate limiting plate 15B has a flat plate shape having a surface direction orthogonal to the axial direction of the fan 7, and has a metal mesh, a punching plate, or a plate on which many slits are formed. The perforated plate is a cantilever supporting shape fixed only to the peripheral wall surface 6 a of the machine room 6.

  The front-rear position of the flow rate limiting plate 15B is the same as the flow rate limiting plate 15A of the first embodiment, when the diameter of the fan 7 is D, and the position upstream of the upstream end of the fan 7 by 0.1D or more. It has become.

  When the width of the machine room 6 is L, the flow rate limiting plate 15B protrudes 0.2 L or more from the end face on the fan 7 side of the machine room 6 (the peripheral wall surface 6a) to the fan 7 side.

  As described above, this outdoor unit 1B has a cantilever fixed only on the peripheral wall surface 6a of the machine room 6 while providing the flow rate limiting plate 15B at a position 0.1D or more upstream from the upstream end of the fan 7. The shape of the support was set so that the width of the machine room 6 was 0.2 L or more with respect to L.

  Thereby, the range in which the flow velocity limiting plate 15B is installed can be limited only to the range in which the high-speed flow F around the peripheral wall surface 6a of the machine room 6 can be generated. Therefore, it is possible to prevent the flow in the region where the high-speed flow F is not generated from being hindered by the flow rate limiting plate 15B, and to avoid the performance deterioration of the heat exchanger 10.

[Third Embodiment]
FIG. 4 is a cross-sectional view of an outdoor unit showing a third embodiment of the present invention.
This outdoor unit 1C is different from the outdoor unit 1A of the first embodiment in the shape and fixing structure of the flow rate limiting plate 15C, and is the same in other parts. Accordingly, the same parts as those of the outdoor unit 1A of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, the flow rate limiting plate 15 </ b> C is close to the peripheral wall surface 6 a of the machine room 6 with a gap S in the plan view, and the other end faces the blade side of the fan. In addition, the gap S extends so as to increase from the machine chamber 6 side toward the blade 7a side. The flow rate limiting plate 15C extends in the tangential direction from the peripheral wall surface 6a of the machine room 6 in plan view.

  The position of the flow rate limiting plate 15C on the fan 7 side is close to the upstream end of the bell mouth 7c. Note that, like the air conditioners 1A and 1B of the first and second embodiments, the flow rate limiting plate 15C may be a porous plate.

  According to this configuration, when the fan 7 is operated, the high-speed flow F that goes around the peripheral wall surface 6a of the machine room 6 flows into the gap S between the peripheral wall surface 6a and the flow rate limiting plate 15C as shown in FIG. . Since the gap S increases from the machine room 6 side toward the blade 7a side of the fan 7, the high-speed flow F passing through the gap S is decelerated by the diffuser effect. Therefore, the high-speed flow F is prevented from colliding with the blade 7a without being decelerated and generating noise, and the noise of the fan 7 can be reduced with a simple and inexpensive configuration.

  Further, the flow velocity limiting plate 15C extending in the tangential direction from the peripheral wall surface 6a of the machine room 6 in a plan view extends obliquely toward the blade 7a side of the fan 7, and thus does not disturb the entire air flow. For this reason, it can prevent that the air flow in the other area | region where the high-speed flow F does not generate | occur | produce is obstructed or disturbed, and the performance fall of the heat exchanger 10 can be avoided. In the present embodiment, the flow rate limiting plate 15C has a flat plate shape, but may be gently curved along the curvature of the peripheral wall surface 6a so as to have an optimum diffuser angle.

[Fourth Embodiment]
FIG. 6 is a front view of an outdoor unit showing a fourth embodiment of the present invention, and FIG. 7 is a cross-sectional view of the outdoor unit along the line VII-VII in FIG.
This outdoor unit for air conditioner 1D is not equipped with a flow rate limiting plate and the air conditioners 1A, 1B of the first to third embodiments in that a buffer film 7e is provided on the blade 7a of the fan 7. , 1C and the other parts are the same. Therefore, the same parts are denoted by the same reference numerals and description thereof is omitted.

  The buffer film 7e is a film having elasticity, and is provided on the pressure surface side of the blade 7a (front side surface seen in FIG. 6). A suitable material for the buffer film 7e is a liquid rubber or a liquid resin that hardens and solidifies after application. Alternatively, a rubber or soft resin film may be adhered or welded to the pressure surface of the blade 7a. The thickness of the buffer film 7e is about 1 mm to 3 mm.

  The range in which the buffer film 7e is provided is a range from the tip of the blade 7a to about half. In this embodiment, as shown in FIG. 7, when the length from the center of the fan 7 to the tip of the blade 7a is R, the distance from the center of the fan 7 to about 0.6R to the tip of the blade 7a. A buffer film 7e is provided in the range.

  According to the outdoor unit 1D having the above-described configuration, the air that has passed through the heat exchanger 10 (long side portion 10a) located on the back side of the machine room 6 is contracted by the peripheral wall surface 6a of the machine room 6, and the high-speed flow F and Even when the blade 7a collides with the fan 7, the momentum of the high-speed flow F is attenuated by the elastic buffer film 7e provided on the pressure surface of the blade 7a. Therefore, the generation of a collision sound due to the high-speed flow F colliding with the blade 7a is suppressed, and the noise of the fan 7 can be reduced with a simple and inexpensive configuration in which the buffer film 7e is provided on the blade 7a.

  Further, by providing the buffer film 7e only in the range from the tip of the blade 7a to about half, the range in which the buffer film 7e is provided is minimized, and the increase in the weight of the blade 7a and the influence on the air flow are minimized. Can be suppressed.

  As described above, according to the outdoor units 1A, 1B, 1C, and 1D according to the above embodiments, the heat exchanger 10 (long side portion 10a) installed on the back side of the housing 2 is connected to the machine room 6. The noise of the fan 7 can be reduced with a simple and inexpensive configuration while extending to the rear side and increasing the area of the heat exchanger 10 to improve the air conditioning performance.

  Note that the present invention is not limited to the configurations of the first to fourth embodiments, and can be appropriately modified or improved without departing from the gist of the present invention. Embodiments to which are added are also included in the scope of rights of the present invention. For example, you may combine the structure of each embodiment.

1A, 1B, 1C, 1D outdoor unit (outdoor unit for air conditioner)
2 Housing 3 Air outlet 4a, 4b Air inlet 6 Machine room 6a Perimeter wall surface of machine room 7 Fan 7a Fan blade 7b Motor 7d Motor deck 7e Buffer film 8 Compressor 9 Heat exchange chamber 10 Heat exchangers 15A, 15B, 15C Flow limit plate D Fan diameter L Machine room width S Clearance

Claims (10)

A box-shaped housing;
A machine room provided on one side in the width direction inside the housing;
A fan that is provided on the other side in the width direction inside the casing and blows outside air from the back side to the front side of the casing;
A heat exchanger installed along the back of the housing and extending from the back of the fan to the back of the machine room;
On the upstream side of the fan, a flow rate restriction that is provided in a range from the peripheral wall surface of the machine room to the center of the fan in a plan view and restricts the flow rate of airflow flowing from the back side of the machine room to the fan side. The board,
An outdoor unit for an air conditioner characterized by comprising:   The outdoor unit for an air conditioner according to claim 1, wherein the flow rate limiting plate has a flat plate shape having a surface direction orthogonal to the axial direction of the fan.   The outdoor unit for an air conditioner according to claim 2, wherein one end of the flow rate limiting plate is fixed to the machine room and the other end is fixed to a motor deck that supports the motor of the fan in plan view.   The outdoor unit for an air conditioner according to claim 2 or 3, wherein when the diameter of the fan is D, the flow rate limiting plate is installed 0.1D or more upstream from the upstream end of the fan.   5. The air conditioner according to claim 2, wherein when the width of the machine room is L, the flow rate limiting plate protrudes 0.2 L or more from the end face on the fan side of the machine room to the fan side. Outdoor unit for machine.   The flow rate limiting plate has a gap in proximity to the peripheral wall surface of the machine room, the other end faces the blade side of the fan, and the gap has a width of the machine in plan view. The outdoor unit for an air conditioner according to claim 1, wherein the outdoor unit extends so as to increase from the chamber side toward the blade side.   The outdoor unit for an air conditioner according to claim 6, wherein the flow rate limiting plate extends in a tangential direction from a peripheral wall surface of the machine room.   The outdoor unit for an air conditioner according to claim 1, wherein the flow rate limiting plate is a perforated plate. A box-shaped housing;
A machine room provided on one side in the width direction inside the housing;
A fan that is provided on the other side in the width direction inside the casing and blows outside air from the back side to the front side of the casing;
A heat exchanger installed along the back of the housing and extending from the back of the fan to the back of the machine room;
A buffer film having elasticity provided on the pressure surface side of each blade of the fan;
An outdoor unit for an air conditioner characterized by comprising:   The outdoor unit for an air conditioner according to claim 9, wherein a range in which the buffer film is provided is a range from a tip of the blade to about half.

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