Heat exchanger, air conditioning device outdoor unit having heat exchanger, and air conditioning device having air conditioning device outdoor unit

Abstract

Provided is a heat exchanger that is disposed along a plurality of side surfaces of a housing and that has a flat portion, which is a flat section in plan view, and at least one curved portion, which is a curved section in plan view. The heat exchanger comprises: a plurality of heat transfer tubes that are arranged such that the vertical direction is the tube extension direction and the tubes are spaced apart from one another in the horizontal direction; one upper header that is provided to the upper part of the plurality of heat transfer tubes; and one lower header that is provided to the lower part of the plurality of heat transfer tubes. The lower header has at least one refrigerant inlet through which a refrigerant flows in from the outside and at least one refrigerant outlet through which the refrigerant flows out to the outside when the heat exchanger functions as an evaporator. The lower header has a double-tube structure that includes one or more inner pipes which are disposed in the arrangement direction of the plurality of heat transfer tubes and in which a plurality of orifices through which the refrigerant flows are formed with space therebetween, and an outer pipe into which the one or more inner pipes are inserted. The lower header is provided with at least one partition plate which partitions the inside of the lower header in the arrangement direction of the plurality of heat transfer tubes to form a plurality of compartments. In one of the plurality of compartments that is positioned on one end side of the lower header, one of the one or more inner pipes is provided in the flat portion, and the refrigerant inlet is provided in said one inner pipe.

Description

Heat exchanger, outdoor unit of air conditioner equipped with heat exchanger, and air conditioner equipped with outdoor unit of air conditioner

[0001] The present disclosure relates to a heat exchanger having a header with a double-pipe structure, an outdoor unit of an air conditioner equipped with the heat exchanger, and an air conditioner equipped with the outdoor unit of an air conditioner.

[0002] A heat exchanger arranged along multiple side surfaces of a housing has been known in the art, in which the refrigerant distribution performance of the headers has been improved (see, for example, Patent Document 1). The heat exchanger in Patent Document 1 includes a first heat exchanger and a second heat exchanger. The first header of the first heat exchanger and the second header of the second heat exchanger have a double-pipe structure consisting of an inner pipe and an outer pipe, and the inner pipe of the first heat exchanger and the inner pipe of the second heat exchanger are connected by a bent inner pipe having a curvature.

[0003] In this way, the first header of the first heat exchanger and the second header of the second heat exchanger have a double-pipe structure consisting of an inner pipe and an outer pipe, and the inner pipe of the first heat exchanger and the inner pipe of the second heat exchanger are connected by a bent inner pipe, thereby improving the refrigerant distribution performance of the headers in heat exchangers arranged along multiple side surfaces of a housing.

[0004] Patent No. 7353480

[0005] However, in Patent Document 1, the first header of the first heat exchanger and the second header of the second heat exchanger are separate components that are connected by a bent inner pipe, which increases the number of components compared to when the first header of the first heat exchanger and the second header of the second heat exchanger are integrally configured, resulting in issues such as increased costs and poor manufacturability.

[0006] The present disclosure has been made in consideration of the problems with the above-mentioned conventional technology, and aims to provide a heat exchanger that is arranged along multiple side surfaces of a housing, which reduces costs and improves manufacturability while maintaining refrigerant distribution performance, an outdoor unit of an air conditioning device equipped with a heat exchanger, and an air conditioning device equipped with an outdoor unit of an air conditioning device.

[0007] The heat exchanger according to the present disclosure is a heat exchanger arranged along a plurality of side surfaces of a housing, and having flat portions that are flat in a plan view and at least one curved portion that is curved in a plan view, and includes a plurality of heat transfer tubes that are arranged at intervals in a horizontal direction with a tube extension direction in the up-down direction, one upper header provided above the plurality of heat transfer tubes, and one lower header provided below the plurality of heat transfer tubes, and the lower header has at least one refrigerant inlet through which a refrigerant flows in from the outside when the heat exchanger functions as an evaporator, and at least one refrigerant inlet through which the refrigerant flows out to the outside when the heat exchanger functions as an evaporator. The lower header has a double-pipe structure including at least one inner tube having one refrigerant outlet, arranged in the arrangement direction of the heat transfer tubes, and having a plurality of orifices formed at intervals through which the refrigerant flows, and an outer tube into which the at least one inner tube is inserted, and the lower header is provided with at least one partition plate that divides the interior of the lower header in the arrangement direction of the heat transfer tubes and forms a plurality of chambers, one of the at least one inner tube being provided in the flat portion of a chamber located on one end side of the lower header among the plurality of chambers, and the refrigerant inlet being provided in the one inner tube.

[0008] An outdoor unit of an air conditioner according to the present disclosure includes the housing and the heat exchanger described above arranged along a plurality of side surfaces of the housing.

[0009] An air conditioner according to the present disclosure includes the outdoor unit of the air conditioner described above.

[0010] According to the present disclosure, a heat exchanger arranged along multiple side surfaces of a housing has a single upper header and a single lower header. In other words, the upper header and the lower header are integrally formed, thereby reducing costs and improving manufacturability. The lower header has a double-pipe structure including at least one inner tube arranged in the direction of the arrangement of the heat transfer tubes and an outer tube with the at least one inner tube inserted therein. One of the at least one inner tubes is provided in a flat portion of one of the multiple chambers located at one end of the lower header, and a refrigerant inlet is provided in that one inner tube. In other words, the lower header has a double-pipe structure, and the inner tube is provided only in the flat portion of the lower header, not in the curved portion. Furthermore, when the heat exchanger functions as an evaporator, the inner tube is provided in the chamber into which the two-phase refrigerant flows from the outside. This prevents refrigerant distribution bias caused by eccentricity and deformation of the inner tube at the curved portion while maintaining refrigerant distribution performance. In addition, because the interior of the lower header is divided into multiple chambers by partition plates, the length of time the refrigerant flows horizontally within the lower header can be reduced, and pressure loss of the refrigerant within the lower header can be reduced, improving heat exchange performance. As a result, in a heat exchanger arranged along multiple side surfaces of a housing, costs can be reduced and manufacturability can be improved while maintaining refrigerant distribution performance.

[0011] 4 is a circuit diagram showing an example of the configuration of an air conditioning apparatus according to embodiment 1. FIG. 1 is a perspective view showing the appearance of the outdoor unit of FIG. 1. FIG. 2 is a perspective view showing the appearance of a heat exchanger according to embodiment 1. FIG. 3 is a front schematic view showing the appearance of a heat exchanger according to embodiment 1. FIG. 4 is a cross-sectional view taken along the arrows C-C of the upper header of FIG. 4. FIG. 5 is a cross-sectional view taken along the arrows D-D of the lower header of FIG. 4. FIG. 6 is a plan schematic view showing a heat exchanger arranged within a housing of an outdoor unit of an air conditioning apparatus according to embodiment 1. FIG. 7 is a front schematic view showing the appearance of a heat exchanger according to embodiment 2. FIG. 8 is a plan schematic view showing a heat exchanger arranged within a housing of an outdoor unit of an air conditioning apparatus according to embodiment 2. FIG. 9 is a front schematic view showing the appearance of a heat exchanger according to embodiment 3. FIG. 10 is a plan schematic view showing a heat exchanger arranged within a housing according to a modified example of an outdoor unit of an air conditioning apparatus according to embodiment 3. FIG. 11 is a circuit diagram showing an example of the configuration of a first modified example of an air conditioning apparatus according to embodiment 3. FIG. 12 is a circuit diagram showing an example of the configuration of a second modified example of an air conditioning apparatus according to embodiment 3.

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited to the embodiments described below. Furthermore, the size relationships between components in the drawings may differ from those in reality. Furthermore, in the following description, terms indicating directions, such as "upper," "lower," "right," "left," "front," and "rear," are used as appropriate to facilitate understanding, but these terms are for explanatory purposes and do not limit the embodiments. Furthermore, in the embodiments, terms such as "upper," "lower," "right," "left," "front," and "rear" are used when viewing the heat exchanger from the front.

[0013] Embodiment 1. An air conditioning apparatus 100 according to embodiment 1 will be described. The air conditioning apparatus 100 according to embodiment 1 performs air conditioning of a space to be air-conditioned by circulating a refrigerant in a refrigerant circuit and transferring heat between outdoor air and indoor air via the refrigerant.

[0014] [Configuration of Air Conditioning Apparatus 100] Fig. 1 is a circuit diagram showing an example of the configuration of an air conditioning apparatus 100 pertaining to Embodiment 1. As shown in Fig. 1, the air conditioning apparatus 100 includes an outdoor unit 10 and one or more indoor units 20. The outdoor unit 10 and the indoor units 20 are connected by refrigerant piping through which a refrigerant flows. By connecting the outdoor unit 10 and the indoor units 20 by refrigerant piping, a refrigerant circuit through which the refrigerant circulates is formed. Note that in this example, three indoor units 20 are connected, but this is not limited thereto, and the number of indoor units 20 may be one, two, or four or more.

[0015] (Outdoor Unit 10 ) The outdoor unit 10 includes a compressor 11 , a refrigerant flow switching device 12 , a heat exchanger 30 , an accumulator 14 , and a fan 15 .

[0016] The compressor 11 draws in a low-temperature, low-pressure refrigerant, compresses the drawn refrigerant, and discharges a high-temperature, high-pressure refrigerant. The compressor 11 is, for example, an inverter compressor whose capacity, which is the amount of refrigerant delivered per unit time, is controlled by changing the operating frequency.

[0017] The refrigerant flow switching device 12 is, for example, a four-way valve, and switches between cooling operation and heating operation by switching the direction of refrigerant flow. The refrigerant flow switching device 12 is not limited to the above-mentioned four-way valve, and may be used in combination with other valves, for example.

[0018] The heat exchanger 30 exchanges heat between the refrigerant and outdoor air supplied by a nearby fan 15. Specifically, the heat exchanger 30 functions as a condenser that condenses and liquefies the refrigerant by dissipating heat from the refrigerant to the outdoor air during cooling operation. The heat exchanger 30 also functions as an evaporator that vaporizes and gasifies the refrigerant during heating operation and absorbs heat from the outdoor air as heat of vaporization.

[0019] In this example, the heat exchanger 30 is configured by connecting a first heat exchanger 30a and a second heat exchanger 30b in parallel to each other. However, the configuration of the heat exchanger 30 is not limited to this example.

[0020] The fan 15 is a blower for supplying outdoor air to the heat exchanger 30. The rotation speed of the fan 15 is controlled by a control device (not shown), thereby controlling the condensation capacity or evaporation capacity of the heat exchanger 30.

[0021] The accumulator 14 is provided on the suction side of the compressor 11. The accumulator 14 stores excess refrigerant generated due to the difference in operating state between cooling operation and heating operation, excess refrigerant due to transient changes in operation, etc. Note that the accumulator 14 is not necessarily provided.

[0022] (Indoor unit 20) Each indoor unit 20 has an expansion device 21 and an indoor heat exchanger 22. The expansion device 21 is, for example, an expansion valve, and reduces the pressure of the refrigerant to expand it. The expansion device 21 is, for example, configured with a valve that can control the opening degree, such as an electronic expansion valve.

[0023] The indoor heat exchanger 22 exchanges heat between the refrigerant and indoor air supplied by a blower such as a fan (not shown). This generates conditioned air for heating or cooling, which is supplied to the space to be air-conditioned. The indoor heat exchanger 22 functions as an evaporator during cooling operation. The indoor heat exchanger 22 also functions as a condenser during heating operation.

[0024] [Refrigerant Operation of Air Conditioning Apparatus 100] Next, the operation of the air conditioning apparatus 100 configured as described above will be described with reference to Fig. 1. Here, as an example, the flow of refrigerant when the air conditioning apparatus 100 performs cooling operation and heating operation will be described. Note that the air conditioning apparatus 100 is not limited to this example, and can also perform various operations that a general air conditioning apparatus can perform, such as fan operation and defrosting operation.

[0025] (Cooling operation) When the air conditioning apparatus 100 performs cooling operation, first, the refrigerant flow switching device 12 is switched to the state shown by the solid line in Fig. 1. That is, the refrigerant flow switching device 12 is switched so that the discharge side of the compressor 11 is connected to the heat exchanger 30 and the suction side of the compressor 11 is connected to the indoor heat exchanger 22.

[0026] When the compressor 11 is driven, a high-temperature, high-pressure gas refrigerant is discharged from the compressor 11. The high-temperature, high-pressure gas refrigerant discharged from the compressor 11 flows into the heat exchanger 30, which functions as a condenser, via the refrigerant flow switching device 12. In the heat exchanger 30, heat is exchanged between the high-temperature, high-pressure gas refrigerant that has flowed in and the outdoor air supplied by the fan 15. As a result, the high-temperature, high-pressure gas refrigerant condenses into a low-temperature, high-pressure liquid refrigerant, which flows out of the heat exchanger 30. The low-temperature, high-pressure liquid refrigerant that has flowed out of the heat exchanger 30 then flows out of the outdoor unit 10.

[0027] The low-temperature, high-pressure liquid refrigerant flowing out of the outdoor unit 10 flows into each indoor unit 20. In each indoor unit 20, the low-temperature, high-pressure liquid refrigerant expands in a throttling device 21, becoming a two-phase refrigerant in which low-temperature, low-pressure gas refrigerant and liquid refrigerant are mixed. The low-temperature, low-pressure two-phase refrigerant flows into the indoor heat exchanger 22, which functions as an evaporator. In the indoor heat exchanger 22, heat is exchanged between the inflowing low-temperature, low-pressure two-phase refrigerant and indoor air supplied by a blower (not shown). As a result, the liquid refrigerant in the two-phase refrigerant evaporates and becomes a high-temperature, low-pressure gas refrigerant, which flows out of the indoor heat exchanger 22. The high-temperature, low-pressure gas refrigerants flowing out of each indoor heat exchanger 22 flow out of the indoor unit 20, join together, and flow into the outdoor unit 10.

[0028] The high-temperature, low-pressure gas refrigerant that has flowed into the outdoor unit 10 flows into the compressor 11 via the refrigerant flow switching device 12 and the accumulator 14. This cycle is repeated thereafter, causing the refrigerant to circulate through the refrigerant circuit.

[0029] (Heating Operation) When the air conditioning apparatus 100 performs heating operation, first, the refrigerant flow switching device 12 is switched to the state shown by the dashed line in Fig. 1. That is, the refrigerant flow switching device 12 is switched so that the discharge side of the compressor 11 is connected to the indoor heat exchanger 22 and the suction side of the compressor 11 is connected to the heat exchanger 30.

[0030] When the compressor 11 is driven, high-temperature, high-pressure gas refrigerant is discharged from the compressor 11. The high-temperature, high-pressure gas refrigerant discharged from the compressor 11 flows out of the outdoor unit 10 via the refrigerant flow switching device 12. The high-temperature, high-pressure gas refrigerant flowing out of the outdoor unit 10 branches and flows into each indoor unit 20. In each indoor unit 20, the high-temperature, high-pressure gas refrigerant flows into an indoor heat exchanger 22 that functions as a condenser. In the indoor heat exchanger 22, heat is exchanged between the high-temperature, high-pressure gas refrigerant that has flowed in and indoor air supplied by a blower (not shown). As a result, the high-temperature, high-pressure gas refrigerant condenses into a low-temperature, high-pressure liquid refrigerant.

[0031] The low-temperature, low-pressure liquid refrigerant flowing out of the indoor heat exchanger 22 expands in the expansion device 21, becoming a two-phase refrigerant consisting of a mixture of low-temperature, low-pressure gas refrigerant and liquid refrigerant. The low-temperature, low-pressure two-phase refrigerant flows out of each indoor unit 20, joins together, and flows into the outdoor unit 10. The low-temperature, low-pressure two-phase refrigerant that has flowed into the outdoor unit 10 flows into the heat exchanger 30, which functions as an evaporator. In the heat exchanger 30, heat is exchanged between the flowing low-temperature, low-pressure two-phase refrigerant and the outdoor air supplied by the fan 15. As a result, the liquid refrigerant in the two-phase refrigerant evaporates and becomes a high-temperature, low-pressure gas refrigerant. The high-temperature, low-pressure gas refrigerant then flows out of the heat exchanger 30.

[0032] The high-temperature, low-pressure gas refrigerant that flows out of the heat exchanger 30 flows into the compressor 11 via the refrigerant flow switching device 12 and the accumulator 14. This cycle is repeated thereafter, causing the refrigerant to circulate through the refrigerant circuit.

[0033] [Structure of the outdoor unit 10] Figure 2 is a perspective view showing the appearance of the outdoor unit 10 of Figure 1. Note that Figure 2 illustrates the arrangement of the heat exchanger 30 inside the outdoor unit 10 so that it can be seen.

[0034] As shown in Fig. 2, the outdoor unit 10 according to the first embodiment is formed in a rectangular parallelepiped shape when viewed from above and includes a housing 16 that forms an outer shell. Furthermore, in the outdoor unit 10, a first heat exchanger 30a and a second heat exchanger 30b are provided in a C-shape along three of the four side surfaces of the housing 16. Furthermore, a fan 15 is provided at the top of the outdoor unit 10 to blow air upward. Thus, the outdoor unit 10 according to the first embodiment is a top-flow type in which the fan 15 that blows air upward is disposed above the heat exchanger 30, which is made up of multiple heat exchangers (the first heat exchanger 30a and the second heat exchanger 30b).

[0035] (Heat Exchanger 30) FIG. 3 is a perspective view showing the appearance of the heat exchanger 30 according to the first embodiment. FIG. 4 is a schematic front view showing the appearance of the heat exchanger 30 according to the first embodiment. FIG. 5 is a cross-sectional view taken along the arrows C-C of the upper header 33 in FIG. 4. FIG. 6 is a cross-sectional view taken along the arrows D-D of the lower header 34 in FIG. 4. FIG. 7 is a schematic plan view showing the heat exchanger 30 disposed within the housing 16 of the outdoor unit 10 of the air conditioning apparatus 100 according to the first embodiment. The white arrows in FIG. 3 indicate the flow of air generated by the fan 15. The dashed arrows in FIG. 3, the white arrows and solid arrows in FIG. 4, and the solid arrows in FIG. 6 indicate the flow of refrigerant when the heat exchanger 30 functions as an evaporator. Note that FIGS. 3 and 4 show the heat exchanger 30 before it is disposed within the housing 16, i.e., before it is folded. Furthermore, surface A of one end of the heat exchanger 30 shown in FIG. 4 corresponds to surface A of one end of the heat exchanger 30 shown in FIG. 7, and surface B of the other end of the heat exchanger 30 shown in FIG. 4 corresponds to surface B of the other end of the heat exchanger 30 shown in FIG. 7.

[0036] As shown in FIG. 3 , the heat exchanger 30 includes a first heat exchanger 30a and a second heat exchanger 30b, which are arranged in parallel in the horizontal direction (left-right direction). The heat exchanger 30 has a plurality of heat transfer tubes arranged at intervals in the horizontal direction (left-right direction) with the tube extension direction being the up-down direction (vertical direction). The heat transfer tubes are, for example, flat tubes 31 having a flat cross section, with the outer surface on the longitudinal side of the flat shape along the air flow direction being flat and the outer surface on the lateral side perpendicular to the longitudinal direction being curved. Hereinafter, the heat transfer tubes will be described as flat tubes 31. The plurality of flat tubes 31 are arranged in parallel in the horizontal direction at intervals so that the air generated by the fan 15 can flow through them. Refrigerant flows vertically within the vertically extending tubes. The direction perpendicular to the vertical and horizontal directions is the air flow direction.

[0037] Furthermore, fins 32 joined to the flat tubes 31 are provided between adjacent flat tubes 31 to transfer heat to the flat tubes 31. The fins 32 improve the efficiency of heat exchange between the air and the refrigerant. For example, corrugated fins are used as the fins 32. Note that if sufficient heat exchange between the air and the refrigerant can be achieved on the surfaces of the flat tubes 31, the fins 32 do not need to be provided.

[0038] [Structure of the Upper Header 33 and the Lower Header 34] The upper header 33 is provided above the flat tubes 31. The upper header 33 extends in the arrangement direction of the flat tubes 31, and the upper ends of the flat tubes 31 are directly inserted into this upper header 33. As shown in FIG. 5 , the upper header 33 has a single-tube structure with a U-shaped cross section, with the upper part formed in an arc. However, the shape of the upper header 33 is not limited to the above and may be, for example, a circular cross section. The lower header 34 is provided below the flat tubes 31. The lower header 34 extends in the arrangement direction of the flat tubes 31, and the lower ends of the flat tubes 31 are directly inserted into this lower header 34. As shown in FIG. 6 , the upper header 33 has a double-tube structure including an inner tube 37 and an outer tube 38 extending in the arrangement direction of the flat tubes 31. The inner tube 37 is inserted inside the outer tube 38 and has a circular cross section. The outer pipe 38 has a U-shaped cross section with an arc-shaped lower portion. However, the shape of the outer pipe 38 is not limited to the above and may have a circular cross section, for example. Furthermore, as shown in Fig. 4, the inner pipe 37 has a plurality of orifices 37h formed at intervals in the extension direction, through which the refrigerant flows.

[0039] First refrigerant inlets and outlets (not shown) are formed at both horizontal ends of the lower header 34, and first pipes 35a and 35b are respectively provided at the first refrigerant inlets and outlets. Two second refrigerant inlets and outlets (not shown) are formed in the horizontal center of the lower header 34, and second pipes 36a and 36b are respectively provided at the two second refrigerant inlets and outlets. Hereinafter, the first refrigerant inlets and outlets will also be referred to as refrigerant inlets, and the second refrigerant inlets and outlets will also be referred to as refrigerant outlets. The lower header 34 is connected to the refrigerant circuit of the air conditioning device 100 via the first pipes 35a and 35b and the second pipes 36a and 36b. A partition plate 41 is provided inside the lower header 34 to divide the interior in the direction of the arrangement of the flat tubes 31 and form multiple rooms Ra1, Ra2, Rb1, and Rb2. Some of the multiple chambers Ra1, Ra2, Rb1, and Rb2 constitute the chambers Ra1 and Ra2 of the first heat exchanger 30a, and the remaining portions constitute the chambers Rb1 and Rb2 of the second heat exchanger 30b. Similarly, the interior of the upper header 33 is provided with partition plates 41 that divide the interior in the arrangement direction of the multiple flat tubes 31 into multiple chambers (not shown). Some of the multiple chambers constitute the chambers of the first heat exchanger 30a, and the remaining portions constitute the chambers of the second heat exchanger 30b.

[0040] In this way, by dividing the interior of the lower header 34 into multiple chambers Ra1, Ra2, Rb1, and Rb2 by the partition plates 41, the length over which the refrigerant flows horizontally within the lower header 34 can be shortened, and the pressure loss of the refrigerant within the lower header 34 can be reduced, thereby improving heat exchange performance. Note that in the first embodiment, three partition plates 41 are provided within the lower header 34 and one partition plate 41 is provided within the upper header 33, but the number of partition plates 41 is not limited to the above. It is sufficient that a chamber for the first heat exchanger 30a and a chamber for the second heat exchanger 30b are formed within the upper header 33 and the lower header 34, respectively.

[0041] The first pipe 35a and the second pipe 36a are pipes that allow refrigerant to flow in and out of the chambers Ra1 and Ra2 of the first heat exchanger 30a of the lower header 34, and the first pipe 35b and the second pipe 36b are pipes that allow refrigerant to flow in and out of the chambers Rb1 and Rb2 of the second heat exchanger 30b of the lower header 34.

[0042] 3 and 4 , when the air conditioning apparatus 100 performs heating operation and the heat exchanger 30 functions as an evaporator, two-phase refrigerant flowing out from the throttling device 21 of the indoor unit 20 flows into the lower header 34 via the first pipes 35a and 35b. Specifically, the two-phase refrigerant flowing out from the throttling device 21 of the indoor unit 20 flows into the room Ra1 of the first heat exchanger 30a and the room Rb1 of the second heat exchanger 30b in the lower header 34 via the first pipes 35a and 35b. Then, the gas refrigerant that has exchanged heat in the multiple flat tubes 31 flows out from the room Ra2 of the first heat exchanger 30a and the room Rb2 of the second heat exchanger 30b in the lower header 34 via the second pipes 36a and 36b. Furthermore, when the air conditioning apparatus 100 performs cooling operation and the heat exchanger 30 functions as a condenser, gas refrigerant flowing out from the compressor 11 flows into the lower header 34 via the second pipes 36a, 36b. Specifically, the gas refrigerant flowing out from the compressor 11 flows into the room Ra2 of the first heat exchanger 30a and the room Rb2 of the second heat exchanger 30b in the lower header 34 via the second pipes 36a, 36b. Then, the liquid refrigerant that has undergone heat exchange in the multiple flat tubes 31 flows out from the room Ra1 of the first heat exchanger 30a and the room Rb1 of the second heat exchanger 30b in the lower header 34 via the first pipes 35a, 35b.

[0043] The flat tubes 31, the fins 32, the upper header 33, the lower header 34, the first pipes 35 a, 35 b, and the second pipes 36 a, 36 b are each made of, for example, aluminum and joined together by brazing. The inner pipe 37 and the outer pipe 38 of the lower header 34 are also joined together by brazing.

[0044] As shown in Fig. 4, the heat exchanger 30 has flat portions β and curved portions α arranged alternately in the horizontal direction. As shown in Fig. 7, the heat exchanger 30 has a C-shape in plan view and is arranged along three of the four side surfaces of the housing 16 of the outdoor unit 10 of the air conditioning apparatus 100, with the curved portions α being curved portions in plan view and the flat portions β being flat portions in plan view. In the first embodiment, the heat exchanger 30 has three flat portions β and two curved portions α.

[0045] As shown in FIG. 4 , the lower header 34 has two inner pipes 37. The two inner pipes 37 are respectively provided in the flat portions β of the rooms Ra1 and Rb1, which are located at both ends of the lower header 34, among the multiple rooms Ra1, Ra2, Rb1, and Rb2. The inner pipes 37 provided in the rooms Ra1 and Rb1 are each formed with a first refrigerant inlet / outlet. Furthermore, the outer pipes 38 constituting the rooms Ra2 and Rb2 are each formed with a second refrigerant inlet / outlet. In other words, the two second refrigerant inlets / outlets are connected to the rooms Ra2 and Rb2, respectively. The inner pipe 37 provided in the room Ra1 and the first pipe 35a may be separate or integrally formed. Similarly, the inner pipe 37 provided in the room Rb1 and the first pipe 35b may be separate or integrally formed. Furthermore, the number of inner pipes 37 included in the lower header 34 is not limited to two and may be three or more. By increasing the number of inner pipes 37 provided in the flat portions β of the multiple chambers Ra1, Ra2, Rb1, and Rb2 of the lower header 34, it is possible to improve refrigerant distribution performance.

[0046] As described above, the inner pipes 37 are provided only in the flat portion β of the lower header 34, and not in the curved portion α. ​​Furthermore, when the heat exchanger 30 functions as an evaporator, the inner pipes 37 are provided in the chambers Ra1 and Rb1 into which two-phase refrigerant flows from the outside. This prevents refrigerant distribution bias caused by eccentricity and deformation of the inner pipes 37 at the curved portion α, while maintaining refrigerant distribution performance. The partition plate 41 may be provided in the curved portion α of the lower header 34 instead of the flat portion β, and the same applies to the upper header 33.

[0047] As described above, the heat exchanger 30 according to the first embodiment is a heat exchanger 30 that is arranged along a plurality of side surfaces of the housing 16 and has a flat portion β that is a flat portion in a plan view and at least one curved portion α that is a curved portion in a plan view, and includes a plurality of heat transfer tubes that are arranged at intervals in the horizontal direction with the vertical direction as the tube extension direction, one upper header 33 provided above the plurality of heat transfer tubes, and one lower header 34 provided below the plurality of heat transfer tubes, and the lower header 34 has at least one refrigerant inlet through which a refrigerant flows in from the outside when the heat exchanger 30 functions as an evaporator, and The lower header 34 has a double-pipe structure including at least one inner pipe 37 having at least one refrigerant outlet, the inner pipe 37 being arranged in the arrangement direction of the heat transfer tubes and having a plurality of orifices 37h formed at intervals through which the refrigerant flows, and an outer pipe 38 into which the at least one inner pipe 37 is inserted, the lower header 34 being provided with at least one partition plate 41 that divides the interior of the lower header 34 in the arrangement direction of the heat transfer tubes and forms a plurality of chambers, one of the at least one inner pipe 37 being provided in a flat portion β of a chamber that is located on one end side of the lower header 34, and the refrigerant inlet being provided in one of the inner pipes 37.

[0048] According to the heat exchanger 30 of the first embodiment, the heat exchanger 30 is arranged along multiple side surfaces of the housing 16, and includes only one upper header 33 and one lower header 34. In other words, the upper header 33 and the lower header 34 are integrally formed, thereby reducing costs and improving manufacturability. The lower header 34 has a double-pipe structure including at least one inner tube 37 arranged in the arrangement direction of the heat transfer tubes and an outer tube 38 into which the at least one inner tube 37 is inserted. One of the at least one inner tubes 37 is provided in a flat portion β of a chamber located at one end of the lower header 34, among the multiple chambers. A refrigerant inlet is provided in the single inner tube 37. In other words, the lower header 34 has a double-pipe structure, and the inner tube 37 is provided only in the flat portion β of the lower header 34, not in the curved portion α. ​​When the heat exchanger 30 functions as an evaporator, the inner tube 37 is provided in a chamber into which a two-phase refrigerant flows from the outside. Therefore, refrigerant distribution performance can be maintained while suppressing bias in refrigerant distribution due to eccentricity and deformation of the inner pipe 37 at the curved portion α. ​​Also, because the interior of the lower header 34 is divided into multiple chambers by the partition plate 41, the length over which the refrigerant flows horizontally within the lower header 34 can be reduced, reducing pressure loss of the refrigerant within the lower header 34 and improving heat exchange performance. As described above, in the heat exchanger 30 arranged along multiple side surfaces of the housing 16, costs can be reduced and manufacturability can be improved while maintaining refrigerant distribution performance.

[0049] Furthermore, the outdoor unit 10 of the air conditioning apparatus 100 according to embodiment 1 includes a housing 16 and the above-mentioned heat exchanger 30 arranged along multiple side surfaces of the housing 16.

[0050] According to the outdoor unit 10 of the air conditioning apparatus 100 according to the first embodiment, it is possible to obtain the same effects as the heat exchanger 30 described above.

[0051] Moreover, the air conditioning apparatus 100 according to the first embodiment is equipped with the outdoor unit 10 of the air conditioning apparatus 100 described above.

[0052] According to the air conditioning apparatus 100 according to the first embodiment, it is possible to obtain the same effects as those of the heat exchanger 30 described above.

[0053] Embodiment 2. Hereinafter, embodiment 2 will be described, but explanations of parts that overlap with embodiment 1 will be omitted, and parts that are the same as or equivalent to embodiment 1 will be given the same reference numerals. Furthermore, embodiment 2 will be described mainly focusing on differences from embodiment 1.

[0054] FIG. 8 is a schematic front view showing the appearance of a heat exchanger 30 according to embodiment 2. FIG. 9 is a schematic plan view showing the heat exchanger 30 arranged in the housing 16 of the outdoor unit 10 of the air conditioning apparatus 100 according to embodiment 2. The outline arrows and solid arrows in FIG. 8 indicate the flow of refrigerant when the heat exchanger 30 functions as an evaporator. Note that FIG. 8 shows the heat exchanger 30 in a state before it is arranged in the housing 16, i.e., before it is folded. Furthermore, surface A at one end of the heat exchanger 30 shown in FIG. 8 corresponds to surface A at one end of the heat exchanger 30 shown in FIG. 9, and surface B at the other end of the heat exchanger 30 shown in FIG. 8 corresponds to surface B at the other end of the heat exchanger 30 shown in FIG. 9.

[0055] The heat exchanger 30 according to the second embodiment differs from the heat exchanger 30 according to the first embodiment in its planar shape. As shown in FIG. 8 , first refrigerant inlets (not shown) are formed at both horizontal ends of the lower header 34, and first pipes 35a and 35b are respectively provided at the first refrigerant inlets and outlets. Two second refrigerant inlets and outlets (not shown) are formed in the horizontal center of the lower header 34, and second pipes 36a and 36b are respectively provided at the two second refrigerant inlets and outlets. The lower header 34 is connected to the refrigerant circuit of the air conditioning apparatus 100 via the first pipes 35a and 35b and the second pipes 36a and 36b. As shown in FIG. 8 , a partition plate 41 is provided inside the lower header 34 to divide the interior in the direction of the arrangement of the flat tubes 31 and form multiple chambers Ra1, Ra2, Ra3, Ra4, Rb1, and Rb2. Some of the chambers Ra1, Ra2, Ra3, Ra4, Rb1, and Rb2 constitute the chambers Ra1, Ra2, Ra3, and Ra4 of the first heat exchanger 30a, and the remaining chambers Rb1 and Rb2 of the second heat exchanger 30b. Similarly, the interior of the upper header 33 is provided with partition plates 41 that divide the interior in the arrangement direction of the flat tubes 31 to form a plurality of chambers (not shown). Some of the chambers constitute the chambers for the first heat exchanger 30a, and the remaining chambers constitute the chambers for the second heat exchanger 30b. In this way, by dividing the interior of the lower header 34 into the chambers Ra1, Ra2, Ra3, Ra4, Rb1, and Rb2 by the partition plates 41, the length over which the refrigerant flows horizontally within the lower header 34 can be reduced, reducing pressure loss of the refrigerant within the lower header 34 and improving heat exchange performance. In the second embodiment, five partition plates 41 are provided inside the lower header 34 and two partition plates 41 are provided inside the upper header 33, but the number of partition plates 41 is not limited to the above. It is sufficient that a chamber for the first heat exchanger 30a and a chamber for the second heat exchanger 30b are formed inside the upper header 33 and the lower header 34, respectively.

[0056] The first pipe 35a and the second pipe 36a are pipes that allow refrigerant to flow in and out of the chambers Ra1 and Ra4 of the first heat exchanger 30a of the lower header 34, and the first pipe 35b and the second pipe 36b are pipes that allow refrigerant to flow in and out of the chambers Rb1 and Rb2 of the second heat exchanger 30b of the lower header 34.

[0057] 8, when the air conditioning apparatus 100 performs heating operation and the heat exchanger 30 functions as an evaporator, two-phase refrigerant flowing out from the throttling device 21 of the indoor unit 20 flows into the lower header 34 via the first pipes 35a and 35b. Specifically, the two-phase refrigerant flowing out from the throttling device 21 of the indoor unit 20 flows into the room Ra1 of the first heat exchanger 30a and the room Rb1 of the second heat exchanger 30b in the lower header 34 via the first pipes 35a and 35b. Then, the gas refrigerant that has exchanged heat in the multiple flat tubes 31 flows out from the room Ra4 ​​of the first heat exchanger 30a and the room Rb2 of the second heat exchanger 30b in the lower header 34 via the second pipes 36a and 36b. Furthermore, when the air conditioning apparatus 100 performs cooling operation and the heat exchanger 30 functions as a condenser, gas refrigerant flowing out from the compressor 11 flows into the lower header 34 via the second pipes 36a, 36b. Specifically, the gas refrigerant flowing out from the compressor 11 flows into the room Ra4 ​​of the first heat exchanger 30a and the room Rb2 of the second heat exchanger 30b in the lower header 34 via the second pipes 36a, 36b. Then, the liquid refrigerant that has undergone heat exchange in the multiple flat tubes 31 flows out from the room Ra1 of the first heat exchanger 30a and the room Rb1 of the second heat exchanger 30b in the lower header 34 via the first pipes 35a, 35b.

[0058] The flat tubes 31, the fins 32, the upper header 33, the lower header 34, the first pipes 35 a, 35 b, and the second pipes 36 a, 36 b are each made of, for example, aluminum and joined together by brazing. The inner pipe 37 and the outer pipe 38 of the lower header 34 are also joined together by brazing.

[0059] As shown in Fig. 8, the heat exchanger 30 has flat portions β and curved portions α arranged alternately in the horizontal direction. As shown in Fig. 9, the heat exchanger 30 has a G-shape in plan view and is arranged along four of the four side surfaces of the housing 16 of the outdoor unit 10 of the air conditioning apparatus 100, with the curved portions α being curved portions in plan view and the flat portions β being flat portions in plan view. In the second embodiment, the heat exchanger 30 has four flat portions β and three curved portions α.

[0060] As shown in FIG. 8 , the lower header 34 has three inner pipes 37. Two of the inner pipes 37 are provided in the flat portions β of the rooms Ra1 and Rb1, which are located at both ends of the lower header 34, among the multiple rooms Ra1, Ra2, Ra3, Ra4, Rb1, and Rb2. The remaining inner pipe 37 is provided in the flat portion β of the room Ra3, which is located between the rooms Ra2 and Ra4. The inner pipe 37 provided in the room Ra1 and the inner pipe 37 provided in the room Rb1 are each formed with a first refrigerant inlet / outlet. Furthermore, the outer pipes 38 constituting the rooms Ra4 and Rb2 are each formed with a second refrigerant inlet / outlet. In other words, the two second refrigerant inlets / outlets are connected to the rooms Ra4 and Rb2, respectively. The inner pipe 37 provided in the room Ra1 and the first piping 35a may be separate or integrally formed. Similarly, the inner pipe 37 and the first pipe 35b provided in the chamber Rb1 may be separate or integrally formed. Furthermore, the number of inner pipes 37 provided in the lower header 34 is not limited to three and may be four or more. By increasing the number of inner pipes 37 provided in the flat portions β of the chambers Ra1, Ra2, Ra3, Ra4, Rb1, and Rb2 of the lower header 34, refrigerant distribution performance can be improved.

[0061] As described above, the inner pipes 37 are provided only in the flat portion β of the lower header 34, and not in the curved portion α. ​​Furthermore, when the heat exchanger 30 functions as an evaporator, the inner pipes 37 are provided in the chambers Ra1 and Rb1 into which two-phase refrigerant flows from the outside. This prevents refrigerant distribution bias caused by eccentricity and deformation of the inner pipes 37 at the curved portion α, while maintaining refrigerant distribution performance. The partition plate 41 may be provided in the curved portion α of the lower header 34 instead of the flat portion β, and the same applies to the upper header 33.

[0062] The heat exchanger 30 according to the second embodiment can achieve the same effects as those of the first embodiment. That is, in the heat exchanger 30 arranged along the multiple side surfaces of the housing 16, it is possible to reduce costs and improve manufacturability while maintaining refrigerant distribution performance.

[0063] Embodiment 3. Hereinafter, embodiment 3 will be described, but explanations of parts that overlap with embodiments 1 and 2 will be omitted, and parts that are the same as or equivalent to those in embodiments 1 and 2 will be given the same reference numerals. Furthermore, in embodiment 3, the differences from embodiments 1 and 2 will be mainly described.

[0064] FIG. 10 is a schematic front view showing the appearance of a heat exchanger 30 according to embodiment 3. FIG. 11 is a schematic plan view showing a heat exchanger 30 arranged within the housing 16 of the outdoor unit 10 of an air conditioning apparatus 100 according to embodiment 3. FIG. 12 is a schematic plan view showing a heat exchanger 30 arranged within the housing 16 of a modified example of the outdoor unit 10 of the air conditioning apparatus 100 according to embodiment 3. FIG. 13 is a circuit diagram showing an example of the configuration of a first modified example of the air conditioning apparatus 100 according to embodiment 3. FIG. 14 is a circuit diagram showing an example of the configuration of a second modified example of the air conditioning apparatus 100 according to embodiment 3. The outline arrows and solid arrows in FIG. 10 indicate the flow of refrigerant when the heat exchanger 30 functions as an evaporator. Note that FIG. 10 shows the heat exchanger 30 in a state before it is arranged within the housing 16, i.e., before it is folded. Furthermore, side A of one end of the heat exchanger 30 shown in Figure 10 corresponds to side A of one end of the heat exchanger 30 shown in Figures 11 and 12, and side B of the other end of the heat exchanger 30 shown in Figure 10 corresponds to side B of the other end of the heat exchanger 30 shown in Figures 11 and 12.

[0065] The heat exchanger 30 according to the third embodiment differs from the first and second embodiments in terms of its shape in a plan view. The heat exchanger 30 according to the third embodiment also differs from the first and second embodiments in that it is configured as a single heat exchanger. As shown in FIG. 10 , a first refrigerant inlet / outlet (not shown) is formed at one horizontal end of the lower header 34, and a first pipe 35 is provided at the first refrigerant inlet / outlet. A second refrigerant inlet / outlet (not shown) is formed at the other horizontal end of the lower header 34, and a second pipe 36 is provided at the second refrigerant inlet / outlet. The lower header 34 is connected to the refrigerant circuit of the air conditioning apparatus 100 via the first pipe 35 and the second pipe 36. As shown in FIG. 10 , the interior of the lower header 34 is provided with a partition plate 41 that divides the interior in the direction of the arrangement of the flat tubes 31 and forms multiple chambers R1, R2, R3, and R4. Similarly, the interior of the upper header 33 is provided with a partition plate 41 that divides the interior in the direction of the arrangement of the flat tubes 31 and forms multiple chambers (not shown). In this way, by dividing the interior of the lower header 34 into multiple chambers R1, R2, R3, and R4 by the partition plates 41, the length over which the refrigerant flows horizontally within the lower header 34 can be reduced, and the pressure loss of the refrigerant within the lower header 34 can be reduced, thereby improving heat exchange performance. Note that in the third embodiment, three partition plates 41 are provided within the lower header 34 and one partition plate 41 is provided within the upper header 33, but the number of partition plates 41 is not limited to the above. It is sufficient that at least one partition plate 41 is provided within the lower header 34.

[0066] The first pipe 35 is a pipe for allowing the refrigerant to flow into and out of the chamber R1 of the lower header 34, and the second pipe 36 is a pipe for allowing the refrigerant to flow into and out of the chamber R4 of the lower header 34.

[0067] As shown in FIG. 10 , when the air conditioning apparatus 100 performs heating operation and the heat exchanger 30 functions as an evaporator, two-phase refrigerant flowing out from the throttling device 21 of the indoor unit 20 flows into the lower header 34 via the first pipe 35. Specifically, the two-phase refrigerant flowing out from the throttling device 21 of the indoor unit 20 flows into room R1 of the lower header 34 via the first pipe 35. Then, the gas refrigerant that has undergone heat exchange in the multiple flat tubes 31 flows out from room R4 of the lower header 34 via the second pipe 36. Furthermore, when the air conditioning apparatus 100 performs cooling operation and the heat exchanger 30 functions as a condenser, gas refrigerant flowing out from the compressor 11 flows into the lower header 34 via the second pipe 36. Specifically, the gas refrigerant flowing out from the compressor 11 flows into room R4 of the lower header 34 via the second pipe 36. Then, the liquid refrigerant that has undergone heat exchange in the plurality of flat tubes 31 flows out of the chamber R1 of the lower header 34 via the first pipe 35 .

[0068] The flat tubes 31, the fins 32, the upper header 33, the lower header 34, the first pipe 35, and the second pipe 36 are each made of, for example, aluminum and joined by brazing. The inner pipe 37 and the outer pipe 38 of the lower header 34 are also joined by brazing.

[0069] As shown in Fig. 10, the heat exchanger 30 has flat portions β and curved portions α arranged alternately in the horizontal direction. As shown in Fig. 11, the heat exchanger 30 has an L-shape in plan view and is arranged along two of the four side surfaces of the housing 16 of the outdoor unit 10 of the air conditioning apparatus 100, with the curved portions α being curved portions in plan view and the flat portions β being flat portions in plan view. In the third embodiment, the heat exchanger 30 has two flat portions β and one curved portion α.

[0070] As shown in FIG. 10 , the lower header 34 has two inner pipes 37. One of the inner pipes 37 is located in the flat portion β of the room R1, which is located at one end of the lower header 34, among the multiple rooms R1, R2, R3, and R4. The remaining inner pipe 37 is located in the flat portion β of the room R3, which is located between the rooms R2 and R4. The inner pipe 37 located in the room R1 has a first refrigerant inlet / outlet formed therein. The outer pipe 38 constituting the room R4 has a second refrigerant inlet / outlet formed therein. The inner pipe 37 located in the room R1 and the first piping 35 may be separate or integrally formed. The number of inner pipes 37 included in the lower header 34 is not limited to two. There may be one, three, or more inner pipes 37, as long as they are located in at least the room R1, into which the two-phase refrigerant flows from the outside when the heat exchanger 30 functions as an evaporator. By increasing the number of inner pipes 37 provided in the flat portions β of the plurality of chambers R1, R2, R3, and R4 of the lower header 34, the refrigerant distribution performance can be improved.

[0071] As described above, the inner pipe 37 is provided only in the flat portion β of the lower header 34, and not in the curved portion α. ​​Furthermore, when the heat exchanger 30 functions as an evaporator, the inner pipe 37 is provided in the chamber R1 into which two-phase refrigerant flows from the outside. This prevents refrigerant distribution imbalance caused by eccentricity and deformation of the inner pipe 37 at the curved portion α, while maintaining refrigerant distribution performance. The partition plate 41 may be provided in the curved portion α of the lower header 34 instead of the flat portion β, and the same applies to the upper header 33.

[0072] As shown in FIG. 12 , the outdoor unit 10 of the air conditioning apparatus 100 may include two heat exchangers 30 each having an L-shape in plan view, and the two heat exchangers 30 may be arranged along four of the four side surfaces of the housing 16. That is, the two heat exchangers 30 are arranged in an inverted manner. The two heat exchangers 30 may be connected in series or in parallel. When the two heat exchangers 30 are connected in series, as shown in FIG. 13 , the first pipe 35 of one heat exchanger 30 and the second pipe 36 of the other heat exchanger 30 are connected to the refrigerant circuit of the air conditioning apparatus 100, and the second pipe 36 of one heat exchanger 30 is connected to the first pipe 35 of the other heat exchanger 30. When the two heat exchangers 30 are connected in parallel, as shown in FIG. 14 , the first pipe 35 and the second pipe 36 of the two heat exchangers 30 are each connected to the refrigerant circuit of the air conditioning apparatus 100.

[0073] The heat exchanger 30 according to the third embodiment can achieve the same effects as those of the first and second embodiments. That is, in the heat exchanger 30 arranged along the multiple side surfaces of the housing 16, it is possible to reduce costs and improve manufacturability while maintaining refrigerant distribution performance.

[0074] Although the first to third embodiments have been described above, the present disclosure is not limited to the above-described first to third embodiments, and various modifications and applications are possible within the scope that does not deviate from the gist of the present disclosure.

[0075] 10 outdoor unit, 11 compressor, 12 refrigerant flow switching device, 14 accumulator, 15 fan, 16 housing, 20 indoor unit, 21 throttling device, 22 indoor heat exchanger, 30 heat exchanger, 30a first heat exchanger, 30b second heat exchanger, 31 flat tube, 32 fin, 33 upper header, 34 lower header, 35, 35a, 35b first piping, 36, 36a, 36b second piping, 37 inner pipe, 37h orifice, 38 outer pipe, 41 partition plate, 100 air conditioning device, R1, R2, R3, R4, Ra1, Ra2, Ra3, Ra4, Rb1, Rb2 room, α curved portion, β flat portion.

Claims

1. A heat exchanger arranged along multiple side surfaces of a housing, having flat portions that are flat in a plan view, and at least one curved portion that is curved in a plan view, comprising: a plurality of heat transfer tubes arranged at intervals in the horizontal direction, with the tube extension direction being the up-down direction; one upper header provided above the plurality of heat transfer tubes; and one lower header provided below the plurality of heat transfer tubes, wherein the lower header has at least one refrigerant inlet through which a refrigerant flows from the outside and at least one refrigerant outlet through which the refrigerant flows to the outside when the heat exchanger functions as an evaporator, and has a double-tube structure having at least one inner tube arranged in the arrangement direction of the plurality of heat transfer tubes and having a plurality of orifices formed at intervals through which the refrigerant flows, and an outer tube into which the at least one inner tube is inserted, and wherein the lower header has at least one partition plate that divides the interior of the lower header in the arrangement direction of the plurality of heat transfer tubes, forming a plurality of chambers, and one of the at least one inner tube is a heat exchanger provided in the flat portion of a chamber located on one end side of the lower header among the plurality of chambers, and the refrigerant inlet is provided in one of the inner pipes.

2. The heat exchanger according to claim 1, wherein the at least one curved portion is two; the at least one inner pipe is two or more, two of which are provided on the flat portions of the chambers located on both ends of the lower header, respectively; the at least one refrigerant inlet is two, provided on each of the two inner pipes; and the at least one refrigerant outlet is two, and communicates with different chambers other than the chambers located on both ends of the lower header, respectively, among the multiple chambers.

3. The heat exchanger according to claim 1, wherein the at least one curved portion is three; the at least one inner pipe is two or more, two of which are provided on the flat portions of the chambers located on both ends of the lower header, among the plurality of chambers; the at least one refrigerant inlet is two, provided on each of the two inner pipes; and the at least one refrigerant outlet is two, and communicates with different chambers other than the chambers located on both ends of the lower header, among the plurality of chambers.

4. The heat exchanger according to claim 2 or 3, wherein the number of said at least one inner tube is three or more, and each of said inner tubes is provided on the flat portion of a different chamber of said lower header among said plurality of chambers.

5. An outdoor unit for an air conditioner, comprising: the housing; and a heat exchanger according to any one of claims 1 to 3, arranged along a plurality of side surfaces of the housing.

6. An air conditioner equipped with the outdoor unit of the air conditioner according to claim 5.

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