WO2018189779A1

WO2018189779A1 - Electric motor, air blower, outdoor unit, and air conditioner

Info

Publication number: WO2018189779A1
Application number: PCT/JP2017/014650
Authority: WO
Inventors: 一真野本
Original assignee: 三菱電機株式会社
Priority date: 2017-04-10
Filing date: 2017-04-10
Publication date: 2018-10-18
Also published as: JPWO2018189779A1; JP6896066B2

Abstract

This electric motor is provided with: a cylindrical stator; a rotor that is disposed such that the rotor rotates by having the axis center of the stator at the center; a cylindrical motor case, which houses the stator and the rotor, and which has a bottom wall; a drive board, which is disposed between the stator and the bottom wall in the motor case, and which is provided with a drive circuit that drives the rotor; and one or a plurality of heat sinks, which are disposed on the bottom wall, and which face the drive board via the bottom wall.

Description

Electric motor, blower, outdoor unit, and air conditioner

The present invention relates to an electric motor, a blower equipped with the electric motor, an outdoor unit equipped with the blower, and an air conditioner equipped with the outdoor unit.

Conventionally, since an internal winding and a substrate generate heat when used in an electric motor, the inside of the electric motor is cooled using wind generated by the rotation of the fan of the electric motor. In addition, when the cooling capacity is insufficient to protect the inside of the motor from heat, the motor may be provided with a heat sink to promote cooling of the surface of the motor. As a configuration in which a heat sink is provided in an electric motor, there has been proposed an electric motor in which a fin structure is provided on a bearing bottom surface of the electric motor to promote internal cooling (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2015-14200

In the electric motor described in Patent Document 1, a fin structure that is radial with respect to the shaft of the electric motor is provided on the bottom side surface of the resin-molded electric motor bearing to reduce the coil temperature inside the electric motor. However, in order to use the electric motor in an environment such as a higher load, higher rotation speed, and high temperature outside air, it is emitted from the element of the driving board so as not to exceed the temperature limit of the driving board installed inside the electric motor. Heat also needs to be treated.

The present invention has been made to solve the above-described problems, and provides an electric motor, a blower, an outdoor unit, and an air conditioner that process heat generated from an element included in a drive board of the electric motor. is there.

An electric motor according to the present invention includes a cylindrical stator, a rotor installed rotatably around an axis of the stator, and a cylindrical motor having a bottom wall that houses the stator and the rotor. A case, a drive board provided with a drive circuit for driving the rotor, disposed between the stator and the bottom wall in the motor case, and a drive board disposed on the bottom wall and facing the drive board via the bottom wall One or a plurality of heat sinks.

The electric motor according to the present invention includes one or a plurality of heat sinks arranged on the bottom wall of the motor case and facing the drive board via the bottom wall. Thus, since the electric motor has the heat sink disposed so as to face the drive board close to the heat generation source, the electric motor can process the heat generated from the element included in the drive board. As a result, an electric motor with improved cooling capacity can be obtained.

It is a schematic diagram which shows the structural example of the air conditioner using the electric motor which concerns on Embodiment 1 of this invention. It is a perspective view of the outdoor unit of the air conditioner using the electric motor which concerns on Embodiment 1 of this invention. It is an exploded view of the outdoor unit of FIG. It is a perspective view of the electric motor which concerns on Embodiment 1 of this invention. It is the figure which looked at the electric motor which concerns on Embodiment 1 of this invention from the bottom wall side. FIG. 6 is a cross-sectional view of the electric motor of FIG. 5 along the line AA. It is a figure which shows the drive substrate accommodated in the electric motor which concerns on Embodiment 1 of this invention. It is the schematic of the air blower room provided with the electric motor which concerns on Embodiment 1 of this invention.

Hereinafter, an electric motor, a blower, an outdoor unit, and an air conditioner according to an embodiment of the present invention will be described with reference to the drawings. In addition, the form of drawing is an example and does not limit this invention. Moreover, what attached | subjected the same code | symbol in each figure is the same or it corresponds, and this is common in the whole text of a specification. Furthermore, in the following drawings, the relationship between the sizes of the constituent members may be different from the actual one.

Embodiment 1 FIG.
[Configuration of air conditioner]
FIG. 1 is a schematic diagram illustrating a configuration example of an air conditioner using an electric motor according to Embodiment 1 of the present invention. In FIG. 1, solid arrows indicate the refrigerant flow during the cooling operation of the air conditioner 100, and dotted arrows indicate the refrigerant flow during the heating operation of the air conditioner 100. The air conditioner 100 of FIG. 1 has an indoor unit 110 and an outdoor unit 120, and the indoor unit 110 and the outdoor unit 120 are connected by a refrigerant pipe 130 and a refrigerant pipe 140. In the air conditioner 100, a compressor 210, a flow path switching device 220, an outdoor heat exchanger 230, an expansion valve 240, and an indoor heat exchanger 250 are sequentially connected via a refrigerant pipe. In addition, the structure of the air conditioner 100 shown in FIG. 1 is an example, For example, the muffler, the accumulator, etc. may be provided in the air conditioner 100 of FIG.

The indoor unit 110 has an indoor heat exchanger 250. The indoor heat exchanger 250 performs heat exchange between the air to be air-conditioned and the refrigerant. The indoor heat exchanger 250 functions as a condenser during heating operation, and condenses and liquefies the refrigerant. The indoor heat exchanger 250 functions as an evaporator during the cooling operation, and evaporates and vaporizes the refrigerant. An indoor fan 60 is provided in the vicinity of the indoor heat exchanger 250 so as to face the indoor heat exchanger 250.

[Configuration of outdoor unit]
The outdoor unit 120 includes a compressor 210, a flow path switching device 220, an outdoor heat exchanger 230, and an expansion valve 240. The compressor 210 compresses and discharges the sucked refrigerant. Here, although not particularly limited, the compressor 210 is controlled by, for example, an inverter circuit or the like, and the capacity of the compressor 210 (the amount of refrigerant sent out per unit time) is changed by arbitrarily changing the operation frequency. It may be changed. The flow path switching device 220 is, for example, a four-way valve, and is a device that switches the direction of the flow path of the refrigerant. The air conditioner 100 can realize a heating operation or a cooling operation by switching the flow of the refrigerant using the flow path switching device 220. The outdoor heat exchanger 230 performs heat exchange between the refrigerant and air (outdoor air). The outdoor heat exchanger 230 functions as an evaporator during heating operation, and evaporates and vaporizes the refrigerant. The outdoor heat exchanger 230 functions as a condenser during the cooling operation, and condenses and liquefies the refrigerant. An outdoor blower 50 is provided in the vicinity of the outdoor heat exchanger 230 so as to face the outdoor heat exchanger 230. The expansion valve 240 is a throttling device (flow rate control means), and functions as an expansion valve by adjusting the flow rate of the refrigerant flowing through the expansion valve 240 to depressurize the flowing refrigerant. For example, when the expansion valve 240 is composed of an electronic expansion valve or the like, the opening degree is adjusted based on an instruction from a control device (not shown) or the like.

FIG. 2 is a perspective view of an outdoor unit of an air conditioner using the electric motor according to Embodiment 1 of the present invention. The X axis shown in FIG. 2 indicates the left-right width direction of the outdoor unit 120 with the X1 side as left and the X2 side as right. The Y axis indicates the depth direction before and after the outdoor unit 120 with the Y1 side as the front side and the Y2 side as the back side. Further, the Z-axis indicates the vertical direction of the outdoor unit 120 with the Z1 side up and the Z2 side down. As shown in FIG. 2, the outdoor unit 120 of the air conditioner includes, as members constituting the housing 1, a front panel 2 and a fan grill 7 on the front side, a top panel 3 on the upper surface, and a right side panel on the right side. 5 and a right side cover 8, a bottom plate 6 on the bottom, and a rear panel 4 (see FIG. 3) on the back. The outdoor unit 120 has a suction port for sucking outdoor air on the back surface, and has a blow-out port for blowing out the sucked air on the front surface. Note that the outlet is covered with a fan grill 7.

FIG. 3 is an exploded view of the outdoor unit of FIG. As shown in FIG. 3, the interior of the outdoor unit 120 is divided into a machine room 10 and a blower room 15. A compressor 210 and a control board 12 are installed in the machine room 10. An outdoor heat exchanger 230 is erected on the back side of the outdoor unit 120 in the blower chamber 15. A blower fixing base 17 is provided on the front side of the outdoor heat exchanger 230. An outdoor fan 50 is installed on the fan fixing base 17. The blower fixing base 17 includes a beam 17a and a flat plate 17b. The beam 17a is formed to extend in the vertical direction, and an electric motor 20 (to be described later) is attached to the center of the beam 17a. A flat plate 17b extending to the front side of the outdoor unit 120 is provided at the upper end of the beam 17a. The lower end of the beam 17a is fixed to the bottom plate 6 with screws. The front side of the outdoor unit 120 of the flat plate 17b is fixed to the front panel 2 with screws.

[Configuration of outdoor fan]
The outdoor blower 50 includes an electric motor 20 and a propeller fan 30. The propeller fan 30 has a fan boss portion 30a fixed to a rotating shaft 26 of the electric motor 20 described later, and a plurality of blade portions 30b provided on the outer peripheral wall of the fan boss portion 30a for blowing air in the direction of the rotating shaft 26. ing. Propeller fan 30 is rotated by driving electric motor 20. The outdoor blower 50 corresponds to the “blower” of the present invention.

[Configuration of electric motor]
FIG. 4 is a perspective view of the electric motor according to Embodiment 1 of the present invention. FIG. 5 is a view of the electric motor according to Embodiment 1 of the present invention as viewed from the bottom wall side. FIG. 6 is a cross-sectional view of the electric motor of FIG. 5 along the line AA. The electric motor 20 will be described with reference to FIGS. The electric motor 20 is composed of, for example, a brushless DC motor, and as illustrated in FIG. 6, as illustrated in FIG. 6, a cylindrical stator 21, a rotor 22 that is rotatably installed around the axis of the stator 21, and a stator 21. A cylindrical motor case 23 that houses the rotor 22 and has a bottom wall 23 a, and a drive circuit that is disposed between the stator 21 and the bottom wall 23 a in the motor case 23 and drives the rotor 22. And a heat sink 25 disposed on the bottom wall 23a and facing the drive substrate 24 through the bottom wall 23a. In the electric motor 20, a stator 21 wound with a coil and a driving substrate 24 having a driving circuit for driving the rotor 22 are integrally formed of resin.

The stator 21 includes a stator core, a winding formed by winding a copper wire in a slot of the stator core, and an insulating material that insulates the stator core from the winding. A permanent magnet is used for the rotor 22. As shown in FIGS. 4 and 6, the rotor 22 has a rotation shaft 26 at the axis. As shown in FIG. 6, the rotor 22 is held on the shaft center of the motor case 23 with a rotating shaft 26 supported by

bearings

27 a and 27 b.

The motor case 23 incorporates the stator 21 and the drive substrate 24 and is integrally formed of resin. The motor case 23 is formed in a cylindrical shape, one end is opened, and the other end is closed by a bottom wall 23a. A bracket 29 is press-fitted into the open end of the motor case 23 as shown in FIGS. 4 and 6, and the bearing 27 a is held by the bracket 29. As shown in FIGS. 5 and 6, the bottom wall 23a is a bulging portion 23a1 that bulges outward in a columnar shape at the center portion of the bottom wall 23a, and a portion that does not bulge and is located around the bulging portion 23a1. And an annular portion 23a2 formed in an annular shape. The bearing 27b is disposed and held in the bulging portion 23a1. A connector lead wire 28 for connecting to the outdoor unit 120 is attached to the drive substrate 24 disposed between the bottom wall 23 a and the stator 21. The connector lead wire 28 extends from the side surface of the motor case 23 to the outside through the inside of the resin constituting the motor case 23. Further, as shown in FIGS. 4 to 6, one or a plurality of heat sinks 25 are arranged on the bottom wall 23a that becomes the windward side on the motor case 23 when the electric motor 20 is used as the outdoor blower 50. .

FIG. 7 is a diagram showing a drive board housed in the electric motor according to Embodiment 1 of the present invention. The drive substrate 24 will be described with reference to FIGS. The drive substrate 24 includes a drive circuit that drives the rotor 22 and includes one or more heating elements 24a. The heating element 24a is, for example, various electronic elements such as a semiconductor element such as an integrated circuit (IC), and is an element that generates heat when it operates. In addition, the contour line surrounding the heat generating element 24a shown in FIG. 7 represents the temperature distribution, and the temperature is higher as the heat generating element 24a is approached. As shown in FIG. 6, the drive board 24 is disposed between the stator 21 and the bottom wall 23 a in the motor case 23. As shown in FIG. 7, the drive substrate 24 is formed in an annular shape so as not to interfere with the rotating shaft 26 and the bearing 27 b of the electric motor 20. In FIG. 7, the drive substrate 24 is formed in an annular shape, but the shape is not limited to the annular shape. For example, the drive substrate 24 may be formed in a fan shape, a trapezoidal shape, a circular shape, a rectangular shape, or the like as long as it does not interfere with the rotating shaft 26 and the bearing 27b.

Next, the heat sink 25 will be described with reference to FIGS. The heat sink 25 is formed of a material excellent in heat conduction, and is formed of, for example, copper, copper alloy, aluminum, aluminum alloy or the like. As shown in FIGS. 4 to 6, each of the one or more heat sinks 25 includes a base plate 25a in contact with the bottom wall 23a of the motor case 23, and a plurality of heat sinks 25 arranged in parallel and standing from the base plate 25a. And plate-like fins 25b.

The base plate 25a is formed in a rectangular shape as seen from the standing direction of the fins 25b, as shown in FIG. The fins 25b are provided perpendicular to the base plate 25a of the heat sink 25, are formed in a plate shape, and a plurality of fins 25b are provided in parallel within the same base plate 25a. As shown in FIG. 5, at least one of the plurality of plate-like fins 25b extends in the radial direction from the axial center of the motor case 23 toward the outer periphery. If the surface of the motor case 23 and the heat sink 25 are in contact with each other and at least one of the fins 25b arranged in parallel extends radially from the axis of the motor case 23 toward the outer periphery, Even if the base plate 25a has another shape, the same cooling effect can be obtained. Therefore, the shape of the base plate 25a is not limited to a rectangular shape, and may be other shapes such as a fan shape, a trapezoidal shape, a polygonal shape, a circular shape, and an oval shape.

As shown in FIG. 6, the heat sink 25 is disposed on the bottom wall 23 a opposite to the side on which the drive substrate 24 is disposed. Moreover, the heat sink 25 is arrange | positioned at the cyclic | annular part 23a2 along the outer peripheral wall of the bulging part 23a1, as shown in FIG. As shown in FIGS. 5 and 7, the one or more heat sinks 25 are disposed at positions facing the one or more heating elements 24a via the bottom wall 23a. That is, the heat sink 25 is concentrated on the periphery of the heat generating element 24 a whose temperature rises on the drive substrate 24 while the electric motor 20 is driven.

FIG. 8 is a schematic view of a blower chamber provided with the electric motor according to Embodiment 1 of the present invention. In FIG. 8, the white arrow indicates the direction of blowing air generated by driving the propeller fan 30. The one or more heat sinks 25 are arranged on the windward side with respect to the drive substrate 24 in the direction of the wind generated by driving the propeller fan 30. Further, in the blower chamber 15 of the outdoor unit 120, the outdoor heat exchanger 230 is arranged on the upstream side of the outdoor blower 50 in the air blowing direction generated by driving the propeller fan 30. That is, one or more heat sinks 25 are disposed between the motor case 23 and the outdoor heat exchanger 230. The outdoor heat exchanger 230 corresponds to the “heat exchanger” of the present invention.

Next, operations of the electric motor 20 and the outdoor fan 50 will be described with reference to FIG. When the user drives the electric motor 20, the propeller fan 30 of the outdoor fan 50 rotates in the fan chamber 15 of the outdoor unit 120. When the propeller fan 30 rotates, air is sucked into the housing 1 from the suction port, and heat exchange is performed between the sucked air and the refrigerant in the outdoor heat exchanger 230. Then, the air that has exchanged heat with the refrigerant in the outdoor heat exchanger 230 is blown out of the housing 1 through the blowout opening.

Next, the air passing around the outdoor fan 50 will be described in more detail. The air sucked from the outdoor heat exchanger 230 side becomes wind that flows in the axial direction of the electric motor 20. At this time, the air sucked in the periphery on the shaft of the electric motor 20 flows from the bottom wall 23 a of the motor case 23 to the outer peripheral side of the motor case 23 and flows through the wing part 30 b of the propeller fan 30. That is, the air sucked into the blower chamber 15 becomes a radial flow from the axial center toward the outer periphery on the bottom wall 23 a of the motor case 23. In this wind flow, the heat generated by the heat generating element 24a is transmitted from the base plate 25a of the heat sink to the fins 25b and is radiated to the air flowing around the fins 25b. Since the fins 25b of the heat sink 25 extend in the direction in which the wind flows in the bottom wall 23a, air can easily flow between the fins arranged in parallel, and the surface of the motor case 23 can be efficiently cooled. it can.

As described above, the electric motor 20 houses the cylindrical stator 21, the rotor 22 installed so as to be rotatable about the axis of the stator 21, the stator 21 and the rotor 22, and the bottom. A cylindrical motor case 23 having a wall 23a, a drive board 24 provided between the stator 21 and the bottom wall 23a in the motor case 23 and provided with a drive circuit for driving the rotor 22, and a bottom wall 23a And one or a plurality of heat sinks 25 facing the drive substrate 24 via the bottom wall 23a. Therefore, since the electric motor 20 has the heat sink 25 disposed so as to face the drive substrate 24 close to the heat generation source, it is possible to process the heat generated from the heat generating element 24a included in the drive substrate 24. As a result, the electric motor 20 is improved in heat dissipation performance, and the temperature inside the electric motor 20 is likely to decrease, so that it is possible to perform a high output and high efficiency operation.

In addition, the electric motor 20 includes a base plate 25a in contact with the bottom wall 23a of the motor case 23 and a plurality of plate-like fins that are arranged in parallel while standing from the base plate 25a. 25b. In general, under the condition that the base area and the fin pitch are the same, the heat resistance of the heat sink decreases as the base width increases and the number of fins increases, and the heat dissipation by the heat sink improves. Since the electric motor 20 is provided with a plurality of plate-like fins 25b arranged in parallel on the base plate 25a, for example, the number of fins on the base plate is smaller than when the fins are arranged radially. Can be increased. Therefore, the electric motor 20 can increase the number of fins and improve the heat dissipation performance of the heat sink 25 as compared with, for example, an electric motor in which all fins are provided radially from the axis of the motor case.

In the electric motor 20, the drive substrate 24 has one or more heating elements 24a, and the one or more heat sinks 25 face the one or more heating elements 24a via the bottom wall 23a. It is arranged at the position to do.

In order to use the electric motor 20 in an environment such as a higher load, a higher rotation speed, and high temperature outside air, heat generated from an element of the driving board is not exceeded so as not to exceed the temperature limit of the driving board installed in the electric motor. Need to be processed. For example, in the electric motor described in Patent Document 1, the surface of the bottom surface of the resin-molded electric motor bearing has a fin shape that is radial with respect to the motor shaft, thereby increasing the surface area and improving the internal cooling capacity of the electric motor. I am trying. However, in the outdoor unit of an air conditioner, the space in which fins can be provided is limited to the space between the motor and the heat exchanger, whereas fins are used to improve the cooling capacity of the motor. It needs to be bigger.

On the other hand, in the electric motor 20, one or more heat sinks 25 are arranged at positions facing the one or more heating elements 24a via the bottom wall 23a. Therefore, the electric motor 20 can centrally arrange the heat sink 25 at a position close to the heat source, and the electric motor 20 can be made efficient without increasing the structure of the heat sink 25 between the motor case 23 and the outdoor heat exchanger 230. Can be cooled. Further, it is not necessary to increase the area of the base plate 25a, and the material cost can be suppressed.

The electric motor 20 has a base plate 25a formed in a rectangular shape. Therefore, for example, compared with the case where the base plate 25a is formed in an annular shape so as to match the annular portion 23a2 of the motor case 23, the processing of the heat sink 25 is facilitated, and the manufacturing cost can be suppressed. Moreover, since the base plate 25a is formed in the rectangular shape, the electric motor 20 can easily store or carry the heat sink 25.

In addition, in the electric motor 20, at least one of the plurality of plate-like fins 25 b extends in the radial direction of the motor case 23. The air sucked into the blower chamber 15 becomes a radial flow from the center of the shaft toward the outer periphery on the bottom wall 23 a of the motor case 23. Since at least one of the fins 25b of the heat sink 25 extends in the radial direction in which the wind flows in the bottom wall 23a, air easily flows between the fins arranged in parallel, and the surface of the motor case 23 is efficiently Can be cooled to. Moreover, since the electric motor 20 has the bulging part 23a1, the air sucked into the blower chamber 15 flows along the outer peripheral wall of the bulging part 23a1 from the tip part of the bulging part 23a1 to the base, and the bulging part Wind flows from the base of 23a1 toward the outer edge of the annular portion 23a2. Since at least one of the fins 25b of the heat sink 25 extends in the radial direction in which the wind flows on the bottom wall 23a, air easily flows between the fins arranged in parallel, and the surface of the motor case 23 is It can be cooled efficiently.

Further, in the electric motor 20, the motor case 23 has a stator 21 and a drive board 24 built therein and is integrally molded with resin. Therefore, the electric motor 20 can realize low noise and low vibration.

Further, in the outdoor blower 50, one or a plurality of heat sinks 25 are arranged on the windward side with respect to the drive substrate 24 in the air blowing direction generated by driving the propeller fan 30. Therefore, the air sucked into the blower chamber 15 can easily flow between the fins 25b, and the surface of the motor case 23 can be efficiently cooled.

In addition, the outdoor heat exchanger 230 is disposed on the upstream side of the outdoor blower 50 in the air blowing direction generated by driving the propeller fan 30. Therefore, air exchanged with the outdoor heat exchanger 230 can easily flow between the fins 25b, and the surface of the motor case 23 can be efficiently cooled.

Note that the embodiment of the present invention is not limited to the first embodiment. For example, the electric motor 20 has the cylindrical bulging portion 23a1, but may be a pyramidal or hemispherical bulging portion 23a1. Moreover, the electric motor 20 does not need to provide the bulging part 23a1. Further, the shape of the fin 25b is not limited to a plate shape, and may be, for example, a cylindrical shape, an elliptical column, a rhombus, a prism, or a laminate of thin plates with slits.

1 housing, 2 front panel, 3 top panel, 4 rear panel, 5 right side panel, 6 bottom plate, 7 fan grille, 8 right side cover, 10 machine room, 12 control board, 15 blower room, 17 blower fixing base , 17a beam, 17b flat plate, 20 motor, 21 stator, 22 rotor, 23 motor case, 23a bottom wall, 23a1 bulge, 23a2 annular part, 24 drive board, 24a heating element, 25 heat sink, 25a base plate, 25b fin, 26 rotating shaft, 27a bearing, 27b bearing, 28 connector lead wire, 29 bracket, 30 propeller fan, 30a fan boss, 30b wing, 50 outdoor fan, 60 indoor fan, 100 air conditioner, 110 indoor Machine, 120 outdoor units, 130 Refrigerant pipe, 140 a refrigerant pipe, 210 compressor, 220 flow path switching unit, 230 outdoor heat exchanger 240 expansion valve 250 indoor heat exchanger.

Claims

A cylindrical stator,
A rotor installed rotatably about the axis of the stator;
A cylindrical motor case that houses the stator and the rotor and has a bottom wall;
A drive board provided between the stator and the bottom wall in the motor case and provided with a drive circuit for driving the rotor;
One or more heat sinks disposed on the bottom wall and facing the drive substrate via the bottom wall;
With electric motor.
2. The heat sink according to claim 1, wherein each of the one or more heat sinks includes a base plate that contacts the bottom wall of the motor case, and a plurality of plate-like fins that are erected from the base plate and arranged in parallel. The electric motor described.
The drive substrate has one or more heating elements,
The electric motor according to claim 2, wherein the one or more heat sinks are disposed at positions facing the one or more heating elements via the bottom wall.
The electric motor according to claim 2 or 3, wherein the base plate is formed in a rectangular shape.
5. The electric motor according to claim 2, wherein at least one of the plurality of plate-like fins extends in a radial direction of the motor case.
The electric motor according to any one of claims 1 to 5, wherein the motor case incorporates the stator and the drive substrate and is integrally formed of resin.
The electric motor according to any one of claims 1 to 6,
A propeller fan fixed to the electric motor;
With
The one or more heat sinks are arranged on a windward side with respect to the drive board in a direction of blowing air generated by driving the propeller fan.
A blower according to claim 7;
A heat exchanger for exchanging heat between the refrigerant and air;
With
The heat exchanger is an outdoor unit arranged on the upstream side of the blower in a direction of blowing air generated by driving the propeller fan.
An air conditioner comprising the outdoor unit according to claim 8.