Outdoor unit and air conditioner equipped with same

Abstract

This outdoor unit comprises: a housing having a blowout opening in the center of an upper part, the housing being rectangular in plan view; three outdoor heat exchangers provided inside the housing; and an outdoor fan disposed above the three outdoor heat exchangers, the outdoor fan blowing out air upward from the blowout opening. Each of the three outdoor heat exchangers is provided with a flat pipe group configured from a plurality of flat pipes for which the vertical direction is employed as a pipe extension direction, the plurality of flat pipes being such that refrigerant flows through the interiors thereof and being arranged such that flat surfaces thereof face each other so as to be parallel to one another. The housing has a flow-through surface through which air flows on three side surfaces from among four side surfaces, and has a sealing surface through which air does not flow on the remaining one side surface. The three outdoor heat exchangers are provided along the flow-through surfaces. In an air-cooling operation, the three outdoor heat exchangers are connected to one another such that a first outdoor heat exchanger and a third outdoor heat exchanger are on the upstream side of a refrigerant flow and a second outdoor heat exchanger is on the downstream side of the refrigerant flow, where the first outdoor heat exchanger, the second outdoor heat exchanger, and the third outdoor heat exchanger are the three outdoor heat exchangers lined up in order along the rotational direction of the outdoor fan with reference to the sealing surface.

Description

[Technical field]

[0001] The present disclosure relates to a top flow type outdoor unit and an air conditioner equipped with the same. [Background technology]

[0002] Conventionally, there has been a top-flow type outdoor unit in which an outdoor heat exchanger having a plurality of flat tubes arranged horizontally at intervals with the tube extension direction being the vertical direction, a plurality of fins connected between adjacent flat tubes and transferring heat to the flat tubes, and headers respectively provided at the upper and lower ends of the plurality of flat tubes, and an outdoor fan that blows air upwards are provided inside a casing (see, for example, Patent Document 1).

[0003] In this top-flow type outdoor unit, an outdoor heat exchanger is disposed circumferentially around a housing, and an outdoor fan is disposed above the outdoor heat exchanger and on the top of the housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6595125 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, differences in the wind speed distribution in the circumferential direction of the housing occur, which causes differences in the wind speed passing through each heat exchanger, resulting in a biased heat load distribution. As a result, in the outdoor heat exchanger with a large wind speed, the heat exchange amount is large, and the temperature difference between the refrigerant and the air is small, and the area of ​​the supercooled liquid, which is an area with a small contribution rate as an outdoor heat exchanger, becomes large. In contrast, in the outdoor heat exchanger with a small wind speed, the heat exchange amount is small, and the area of ​​the supercooled liquid is small. And when trying to satisfy the desired heat exchange amount by using the variation in the heat exchange amount in each of these outdoor heat exchangers, the pressure is unnecessarily increased even in the outdoor heat exchanger with a large wind speed that does not need to be increased in pressure, so energy loss increases accordingly. As a result, there was a problem that the heat exchanger performance of the entire outdoor heat exchanger was reduced.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an outdoor unit and an air conditioning apparatus equipped with the same that suppresses deterioration of heat exchange performance due to differences in wind speed distribution. [Means for solving the problem]

[0007] The outdoor unit according to the present disclosure includes a housing having an air outlet at the center of the upper part and having a rectangular shape in a plan view, three outdoor heat exchangers provided inside the housing, and an outdoor fan arranged above the three outdoor heat exchangers and blowing air upward from the air outlet, each of the three outdoor heat exchangers includes a flat tube group made up of a plurality of flat tubes through which a refrigerant flows, with the tube extension direction being in the up-down direction and the flat surfaces facing each other so as to be parallel to each other, and the housing has flow surfaces through which air flows on three of its four sides and an air outlet on the remaining one side. The outdoor heat exchanger has a sealing surface through which refrigerant does not flow, and the three outdoor heat exchangers are each provided along the flow surface, and when the three outdoor heat exchangers arranged in order in the rotation direction of the outdoor fan based on the sealing surface are designated as the first outdoor heat exchanger, the second outdoor heat exchanger, and the third outdoor heat exchanger, respectively, during cooling operation, the three outdoor heat exchangers are each connected such that the first outdoor heat exchanger and the third outdoor heat exchanger are on the upstream side of the refrigerant flow, and the second outdoor heat exchanger is on the downstream side of the refrigerant flow.

[0008] An air conditioner according to the present disclosure includes the above outdoor unit and an indoor unit. Effect of the Invention

[0009] According to the outdoor unit of the present disclosure, during cooling operation, the refrigerant flows in parallel to the first outdoor heat exchanger through which the wind with the highest wind speed flows and the third outdoor heat exchanger through which the wind with the lowest wind speed flows, and the refrigerant is merged in the second outdoor heat exchanger through which the wind with the medium wind speed flows. In this way, the first outdoor heat exchanger and the third outdoor heat exchanger function as upstream heat exchangers, and the second outdoor heat exchanger through which the wind with the medium wind speed flows functions as a downstream heat exchanger. In this way, the refrigerant flows in a gas-liquid two-phase state in the outdoor heat exchanger through which the wind with the highest wind speed flows and the outdoor heat exchanger through which the wind with the lowest wind speed flows, and the region of supercooled liquid is unlikely to occur. In addition, the region of supercooled liquid is processed in the outdoor heat exchanger through which the wind with the medium wind speed flows. As a result, it is possible to suppress a decrease in heat exchanger performance due to differences in wind speed distribution. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing the configuration of an air conditioner equipped with an outdoor unit according to a first embodiment. [Diagram 2] FIG. 1 is a schematic diagram illustrating the configuration of an outdoor unit according to a first embodiment. [Diagram 3] FIG. 2 is a perspective view illustrating the configuration of an outdoor heat exchanger according to the first embodiment. [Figure 4] FIG. 2 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to the first embodiment. [Diagram 5] FIG. 2 is a schematic plan view illustrating the flow of refrigerant during heating operation of the outdoor unit according to the first embodiment. [Figure 6] FIG. 4 is a diagram showing temperature distribution in each outdoor heat exchanger during heating operation of the outdoor unit according to the first embodiment. [Figure 7] FIG. 6 is a schematic plan view illustrating the flow of refrigerant during cooling operation in a modified example of the outdoor unit according to Embodiment 1. [Figure 8] FIG. 6 is a schematic plan view illustrating the flow of refrigerant during heating operation in a modified example of the outdoor unit according to Embodiment 1. [Figure 9] FIG. 11 is a perspective view illustrating the configuration of an outdoor heat exchanger according to a second embodiment. [Figure 10] FIG. 11 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to the second embodiment. [Figure 11] FIG. 11 is a diagram showing the temperature difference between the air and the refrigerant in each region during cooling operation of the outdoor heat exchanger according to the second embodiment. [Figure 12] FIG. 11 is a perspective view illustrating the configuration of an outdoor heat exchanger according to a third embodiment. [Figure 13] FIG. 11 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to embodiment 3. [Figure 14] FIG. 13 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to embodiment 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] 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. In addition, the size relationships of the components in the drawings may differ from the actual ones.

[0012] Embodiment 1 <Air conditioner configuration> FIG. 1 is a diagram showing the configuration of an air conditioner including an outdoor unit 200 according to the first embodiment. As shown in FIG. 1, the air conditioner according to the first embodiment includes an outdoor unit 200 and an indoor unit 100, which are connected by a refrigerant pipe 300. The outdoor unit 200 includes a compressor 210, a flow switching device 220, and an outdoor heat exchanger 230. The indoor unit 100 includes an indoor heat exchanger 110 and a throttling device 120. The compressor 210, the flow switching device 220, the outdoor heat exchanger 230, the throttling device 120, and the indoor heat exchanger 110 are sequentially connected by the refrigerant pipe 300 to form a refrigerant circuit 1 in which the refrigerant circulates. Here, in the air conditioner according to the first embodiment, one outdoor unit 200 and one indoor unit 100 are connected by the refrigerant pipe 300, but the number of outdoor units 200 and indoor units 100 connected is not limited to this.

[0013] The indoor unit 100 has an indoor fan 130 in addition to the indoor heat exchanger 110 and the throttling device 120. The throttling device 120 reduces the pressure of the refrigerant and expands it. The throttling device 120 is, for example, an electronic expansion valve that can adjust the opening of the throttling device, and by adjusting the opening, the refrigerant pressure flowing into the indoor heat exchanger 110 is controlled during cooling operation, and the refrigerant pressure flowing into the outdoor heat exchanger 230 is controlled during heating operation. The indoor heat exchanger 110 exchanges heat between the refrigerant and the air in the room, which is the space to be air-conditioned. For example, during heating operation, the indoor heat exchanger 110 functions as a condenser and condenses and liquefies the refrigerant. Also, during cooling operation, the indoor heat exchanger 110 functions as an evaporator and evaporates and vaporizes the refrigerant. The indoor fan 130 passes indoor air through the indoor heat exchanger 110 and supplies the air that has passed through the indoor heat exchanger 110 to the room.

[0014] <Configuration of the outdoor unit 200> Fig. 2 is a schematic diagram illustrating the configuration of the outdoor unit 200 according to the first embodiment. The outdoor unit 200 according to the first embodiment has an outlet 202 of an outdoor fan 250 in the center of the upper part of a housing 201, and is a top-flow type that blows air upward from the outlet 202. For the sake of explanation, Fig. 2 shows only the upper part of the outdoor heat exchanger 230 arranged in the upper part of the housing 201, but in the outdoor unit 200 according to the first embodiment, the outdoor heat exchanger 230 is arranged up to a position close to the bottom surface of the housing 201.

[0015] The outdoor unit 200 has a compressor 210, a flow switching device 220, an outdoor heat exchanger 230, and an accumulator 240 as devices that configure the refrigerant circuit 1. The compressor 210 draws in low-temperature, low-pressure refrigerant, compresses the drawn-in refrigerant, and discharges high-temperature, high-pressure refrigerant. The compressor 210 is, for example, an inverter compressor whose capacity, which is the amount of refrigerant discharged per unit time, is controlled by changing the operating frequency.

[0016] The flow path switching device 220 is, for example, a four-way valve, and switches between cooling operation and heating operation by switching the direction of the refrigerant flow. Note that the flow path switching device 220 may be a combination of a two-way valve and a three-way valve instead of a four-way valve. When a heating operation is performed, the flow path switching device 220 connects the discharge side of the compressor 210 to the indoor heat exchanger 110 and connects the suction side of the compressor 210 to the outdoor heat exchanger 230. When a cooling operation is performed, the flow path switching device 220 connects the discharge side of the compressor 210 to the outdoor heat exchanger 230 and connects the suction side of the compressor 210 to the indoor heat exchanger 110. The accumulator 240 is installed on the suction side of the compressor 210, passes a gaseous refrigerant (hereinafter referred to as a gaseous refrigerant) and accumulates a liquid refrigerant (hereinafter referred to as a liquid refrigerant).

[0017] The outdoor heat exchanger 230 exchanges heat between the refrigerant and the outdoor air. For the outdoor heat exchanger 230, the refrigerant is a fluid that serves as a heat exchange medium. Here, the outdoor heat exchanger 230 functions as an evaporator during heating operation, evaporating and vaporizing the refrigerant. On the other hand, the outdoor heat exchanger 230 functions as a condenser and a supercooler during cooling operation, condensing and liquefying the refrigerant, and performing supercooling. In addition, the outdoor fan 250 is disposed above the outdoor heat exchanger 230, and is driven to pass air from outside the outdoor unit 200 through the outdoor heat exchanger 230, and then blows the air upward from the air outlet 202.

[0018] <Air conditioner operation> Next, the operation of each device of the air conditioner will be described based on the flow of the refrigerant. First, the operation of each device of the refrigerant circuit 1 in heating operation will be described based on the flow of the refrigerant. The solid arrows in FIG. 1 indicate the flow of the refrigerant in heating operation. The high-temperature, high-pressure gas refrigerant compressed and discharged by the compressor 210 passes through the flow switching device 220 and flows into the indoor heat exchanger 110. While passing through the indoor heat exchanger 110, the gas refrigerant condenses and liquefies by, for example, exchanging heat with the air in the space to be air-conditioned. The condensed and liquefied refrigerant passes through the throttling device 120. The refrigerant is depressurized when passing through the throttling device 120. The refrigerant depressurized by the throttling device 120 and in a gas-liquid two-phase state passes through the outdoor heat exchanger 230. In the outdoor heat exchanger 230, the refrigerant evaporates by exchanging heat with the outdoor air sent from the outdoor fan 250, and the gasified refrigerant passes through the flow switching device 220 and the accumulator 240 and is sucked into the compressor 210 again. In this manner, the refrigerant in the air conditioner circulates to perform air conditioning related to heating.

[0019] Next, the cooling operation will be described. The dotted arrows in FIG. 1 indicate the flow of the refrigerant in the cooling operation. The high-temperature, high-pressure gas refrigerant compressed and discharged by the compressor 210 passes through the flow path switching device 220 and flows into the outdoor heat exchanger 230. Then, the refrigerant passes through the outdoor heat exchanger 230 and condenses by exchanging heat with the outdoor air supplied by the outdoor fan 250, and the liquefied refrigerant passes through the throttling device 120. The refrigerant is decompressed when passing through the throttling device 120. The refrigerant that has been decompressed by the throttling device 120 and turned into a gas-liquid two-phase state passes through the indoor heat exchanger 110. Then, in the indoor heat exchanger 110, the refrigerant evaporates by exchanging heat with the air in the space to be air-conditioned, for example, and the gasified refrigerant passes through the flow path switching device 220 and the accumulator 240 and is sucked into the compressor 210 again. In this manner, the refrigerant of the air conditioner circulates to perform air conditioning related to cooling.

[0020] <Configuration of the Outdoor Heat Exchanger 230> Fig. 3 is a perspective view illustrating the configuration of outdoor heat exchanger 230 according to embodiment 1. The dashed arrows in Fig. 3 indicate the flow of refrigerant during cooling operation. The white arrows in Fig. 3 indicate the flow of air. As shown in Fig. 3, outdoor heat exchanger 230 according to embodiment 1 has a pair of headers, each consisting of two distribution headers 234, which are arranged vertically separated from one another.

[0021] Between the two distribution headers 234, a group of flat tubes 232 (hereinafter referred to as a flat tube group 231) is arranged, which is composed of a plurality of flat tubes 232 through which a refrigerant flows, with the flat surfaces facing each other so as to be parallel to each other, with the vertical direction being the tube extension direction. The flat tubes 232 are heat transfer tubes having a flat cross section, a flat outer surface on the long side of the flat shape along the air flow direction, and a curved outer surface on the short side perpendicular to the longitudinal direction. The flat tubes 232 according to the first embodiment are multi-hole flat tubes having a plurality of holes inside the tube that serve as a flow path for the refrigerant. In the first embodiment, the holes of the flat tubes 232 are formed in the height direction to serve as a flow path between the two distribution headers 234. Between two adjacent flat tubes 232, fins 233 having a wave shape and having a plurality of apexes joined to the flat surfaces of the flat tubes 232 are provided.

[0022] A distribution header 234 is provided on each of both ends of the flat tube group 231. Into the distribution header 234, a lower end portion or an upper end portion of the flat tubes 232 of the flat tube group 231 is inserted.

[0023] A hot gas refrigerant inlet (not shown) is formed at one end of one of the distribution headers 234. In the first embodiment, as shown in FIG. 3, a hot gas refrigerant inlet is formed at one end of the lower distribution header 234. The hot gas refrigerant inlet is connected to the refrigerant circuit 1 of the air conditioner, for example, the discharge side of the compressor 210 during cooling operation, via a gas pipe 237. Therefore, the distribution header 234 in which the refrigerant inlet is formed is also called a gas header. The distribution header 234 in which the refrigerant inlet is formed allows high-temperature, high-pressure gas refrigerant (hereinafter also referred to as hot gas refrigerant) from the compressor 210 to flow into the outdoor heat exchanger 230 during cooling operation, and allows low-temperature, low-pressure gas refrigerant after heat exchange in the outdoor heat exchanger 230 to flow out to the refrigerant circuit 1 during heating operation. In other words, the hot gas refrigerant inlet becomes a hot gas refrigerant inlet. Here, the hot gas refrigerant is not limited to a single-phase gas refrigerant, and may be a two-phase gas-liquid refrigerant including a gas phase of 0°C or higher.

[0024] A liquid refrigerant outlet (not shown) is formed at one end of the other distribution header 234. In the first embodiment, as shown in FIG. 3, a liquid refrigerant outlet is formed at one end of the upper distribution header 234. The liquid refrigerant outlet is connected to the refrigerant circuit 1 of the air conditioner via liquid piping 236. Therefore, the distribution header 234 in which the liquid refrigerant outlet is formed is also called a liquid header. The distribution header 234 in which the liquid refrigerant outlet is formed flows low-temperature, low-pressure two-phase refrigerant into the outdoor heat exchanger 230 during heating operation, and flows out the low-temperature, high-pressure liquid refrigerant after heat exchange in the outdoor heat exchanger 230 during cooling operation. In other words, the liquid refrigerant outlet becomes a liquid refrigerant outflow section.

[0025] The flat tubes 232, the fins 233, and the distribution header 234 are all made of aluminum and are joined together by brazing.

[0026] Fig. 4 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit 200 according to embodiment 1. Fig. 5 is a schematic plan view illustrating the flow of refrigerant during heating operation of the outdoor unit 200 according to embodiment 1. Fig. 6 is a diagram illustrating the temperature distribution of each outdoor heat exchanger 230 during heating operation of the outdoor unit 200 according to embodiment 1.

[0027] 4 and 5, the housing 201 is rectangular in plan view, has flow surfaces 261 through which air flows on three of its four sides, and has a sealing surface 260 through which air does not flow on the remaining side. In addition, the outdoor heat exchangers 230 (230a to 230c) are disposed along each of the flow surfaces 261. That is, three outdoor heat exchangers 230 are provided inside the housing 201.

[0028] 4, during cooling operation, the refrigerant flows inside the outdoor unit 200 as indicated by the diagonal line arrow. When the outdoor heat exchangers 230 arranged in the order of the rotation direction of the outdoor fan 250 (dashed black arrow) based on the sealing surface 260 are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230c, the outdoor heat exchangers 230 are connected by refrigerant piping 203 such that the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c are on the upstream side of the refrigerant flow and the second outdoor heat exchanger 230b is on the downstream side of the refrigerant flow.

[0029] 5, during heating operation, the refrigerant flows inside the outdoor unit 200 as indicated by the hatched arrows. The outdoor heat exchangers 230 are connected by refrigerant piping 203 such that the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c are located downstream of the refrigerant flow, and the second outdoor heat exchanger 230b is located upstream of the refrigerant flow.

[0030] Here, in the past, under low-temperature conditions where frost forms on the outdoor heat exchanger, the heat exchanger performance differs depending on the difference in wind speed distribution, and unevenly deposited frost occurs in the outdoor heat exchanger with low heat exchanger performance, causing a decrease in heating capacity. However, in the first embodiment, as shown in Figs. 5 and 6, during heating operation, the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows can be made to function as a main heat exchanger with a large difference between the air temperature and the refrigerant temperature and a large heat exchange amount, that is, high heat exchanger performance. Therefore, unevenly deposited frost is suppressed in the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows, and therefore a decrease in heating capacity under low-temperature conditions can be suppressed.

[0031] Fig. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation in a modified example of the outdoor unit 200 according to embodiment 1. Fig. 8 is a schematic plan view illustrating the flow of refrigerant during heating operation in a modified example of the outdoor unit 200 according to embodiment 1.

[0032] In the first embodiment, one outdoor fan 250 is provided in the center of the upper part of the housing 201, but the present invention is not limited thereto, and two or more outdoor fans 250 may be provided in the center of the upper part of the housing 201 as long as they all rotate in the same direction, as shown in Figures 7 and 8. In the modified example of the first embodiment shown in Figures 7 and 8, the arrangement of the three outdoor heat exchangers 230 is the same as that of the first embodiment shown in Figures 4 and 5.

[0033] (Effects of the First Embodiment) In the outdoor unit 200 having a sealing surface 260 on one side of the housing 201 through which air does not flow, differences in wind speed distribution occur on each flow surface 261 of the housing 201 (white arrows). In particular, the wind flowing through the first outdoor heat exchanger 230a is the fastest (high wind speed), the wind flowing through the third outdoor heat exchanger 230c is the slowest (low wind speed), and the wind flowing through the second outdoor heat exchanger 230b is intermediate between them (medium wind speed). In the first embodiment, during cooling operation, the refrigerant flows parallel to the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows and the third outdoor heat exchanger 230c through which the wind with the lowest wind speed flows, and the refrigerant is merged at the second outdoor heat exchanger 230c through which the wind with a medium wind speed flows. In this way, the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c function as upstream heat exchangers, and the second outdoor heat exchanger 230c through which the wind with the medium wind speed flows functions as a downstream heat exchanger. In this way, the refrigerant flows in a gas-liquid two-phase state in the outdoor heat exchanger 230 through which the wind with the highest wind speed flows and the outdoor heat exchanger 230 through which the wind with the lowest wind speed flows, and a region of supercooled liquid is unlikely to occur. In addition, the region of supercooled liquid is processed by the outdoor heat exchanger 230 through which the wind with the medium wind speed flows. As a result, it is possible to suppress a decrease in heat exchanger performance due to differences in wind speed distribution. In addition, as shown in Figures 5 and 6, during heating operation, the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows can be made to function as a main heat exchanger with a large difference between the air temperature and the refrigerant temperature and a large heat exchange amount, that is, a high heat exchanger performance. This suppresses the occurrence of unevenly deposited frost on the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows, thereby suppressing a decrease in heating capacity under low temperature conditions.

[0034] As described above, the outdoor unit 200 according to the first embodiment includes a housing 201 having an air outlet 202 at the center of the upper part and rectangular in plan view, three outdoor heat exchangers 230 provided inside the housing 201, and an outdoor fan 250 arranged above the three outdoor heat exchangers 230 and blowing air upward from the air outlet 202. Each of the three outdoor heat exchangers 230 includes a flat tube group 231 consisting of a plurality of flat tubes 232 through which a refrigerant flows, with the flat surfaces facing each other so as to be parallel to each other, with the vertical direction being the tube extension direction, and a plurality of fins 233 arranged between two adjacent flat tubes 232 and joined to the flat surfaces of the flat tubes 232. The housing 201 also includes a circulation surface 261 through which air flows on three of the four side surfaces, and a sealing surface 260 through which air does not flow on the remaining one side surface. The three outdoor heat exchangers 230 are each provided along the flow surface 261, and when the three outdoor heat exchangers 230 arranged in order of the rotation direction of the outdoor fan 250 with the sealing surface 260 as the reference are designated as the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230c, respectively, during cooling operation, the three outdoor heat exchangers 230 are connected such that the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c are on the upstream side of the refrigerant flow, and the second outdoor heat exchanger 230b is on the downstream side of the refrigerant flow.

[0035] According to the outdoor unit 200 of the first embodiment, during cooling operation, the refrigerant flows in parallel to the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows and the third outdoor heat exchanger 230c through which the wind with the lowest wind speed flows, and the refrigerant is merged in the second outdoor heat exchanger 230b through which the wind with the medium wind speed flows. In this way, the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c function as upstream heat exchangers, and the second outdoor heat exchanger 230b through which the wind with the medium wind speed flows functions as a downstream heat exchanger. In this way, the refrigerant flows in a gas-liquid two-phase state in the outdoor heat exchanger 230 through which the wind with the highest wind speed flows and the outdoor heat exchanger 230 through which the wind with the lowest wind speed flows, and a region of supercooled liquid is unlikely to occur. In addition, the region of supercooled liquid is treated in the outdoor heat exchanger 230 through which the wind with the medium wind speed flows. As a result, it is possible to suppress the deterioration of the heat exchanger performance caused by differences in the air velocity distribution.

[0036] Embodiment 2 Hereinafter, the second embodiment will be described, but explanations of parts that overlap with the first embodiment will be omitted, and parts that are the same as or equivalent to the first embodiment will be given the same reference numerals.

[0037] Fig. 9 is a perspective view for explaining the configuration of outdoor heat exchanger 230 according to embodiment 2. Note that dashed arrows in Fig. 9 indicate the flow of refrigerant during cooling operation. Also, white arrows in Fig. 9 indicate the flow of air. As shown in Fig. 9, outdoor heat exchanger 230 according to embodiment 2 has a pair of headers, each of which is made up of two distribution headers 234 and a row-to-row header 238, which are arranged separately above and below in the height direction.

[0038] Between the two distribution headers 234 and the row transfer header 238, a flat tube group 231 is arranged, which is composed of a plurality of flat tubes 232 through which a refrigerant flows, with the flat surfaces facing each other so as to be parallel to each other, with the vertical direction being the tube extension direction. The flat tube group 231 is arranged in two rows in the air flow direction. The flat tube 232 is a heat transfer tube having a flat cross section, a flat outer surface on the long side of the flat shape along the air flow direction, and a curved outer surface on the short side perpendicular to the long side. The flat tube 232 according to the second embodiment is a multi-hole flat tube having a plurality of holes inside the tube that serve as a flow path for the refrigerant. In the second embodiment, the holes of the flat tube 232 are formed in the height direction to serve as a flow path between the distribution header 234 and the row transfer header 238. Between two adjacent flat tubes 232, fins 233 having a wave shape and a plurality of apexes are joined to the flat surfaces of the flat tubes 232 are provided.

[0039] A distribution header 234 is provided at one end of each of the two flat tube groups 231. The two distribution headers 234 are arranged in the same direction in the height direction. The lower end or upper end of the flat tube 232 of the flat tube group 231 is inserted into the distribution header 234. In the second embodiment, as shown in FIG. 9, the lower end of the flat tube 232 of the flat tube group 231 is inserted into the distribution header 234. In addition, a row transfer header 238 is provided at the other end of the two flat tube groups 231. The upper end or lower end of the flat tube 232 of the two flat tube groups 231 is inserted into the row transfer header 238. In the second embodiment, as shown in FIG. 9, the upper end of the flat tube 232 of the two flat tube groups 231 is inserted into the row transfer header 238. The row transfer header 238 distributes the refrigerant that has joined from the flat tubes 232 of one of the flat tube groups 231 to the flat tubes 232 of the other flat tube group 231 .

[0040] A hot gas refrigerant inlet (not shown) is formed at one end of the distribution header 234 on the downstream side in the air flow direction (hereinafter referred to as the downwind side). The hot gas refrigerant inlet is connected to the refrigerant circuit 1 of the air conditioner via a gas pipe 237. Therefore, the downwind side distribution header 234 in which the hot gas refrigerant inlet is formed is also called a gas header. This downwind side distribution header 234 allows high-temperature and high-pressure gas refrigerant from the compressor 210 to flow into the outdoor heat exchanger 230 during cooling operation, and allows low-temperature and low-pressure gas refrigerant after heat exchange in the outdoor heat exchanger 230 to flow out to the refrigerant circuit 1 during heating operation. In other words, the hot gas refrigerant inlet is a hot gas refrigerant inlet. Here, the hot gas refrigerant is not limited to a single-phase gas refrigerant, and may be a two-phase gas-liquid refrigerant including a gas phase of 0°C or higher.

[0041] A liquid refrigerant outlet (not shown) is formed at one end of the distribution header 234 on the upstream side in the air flow direction (hereinafter referred to as the windward side). The liquid refrigerant outlet is connected to the refrigerant circuit 1 of the air conditioner via liquid piping 236. Therefore, the windward side distribution header 234 in which the liquid refrigerant outlet is formed is also called a liquid header. This windward side distribution header 234 flows low-temperature, low-pressure two-phase refrigerant into the outdoor heat exchanger 230 during heating operation, and flows out the low-temperature, high-pressure liquid refrigerant after heat exchange in the outdoor heat exchanger 230 during cooling operation. In other words, the liquid refrigerant outlet is a liquid refrigerant outflow section.

[0042] The flat tubes 232, the fins 233, the distribution header 234, and the row-to-row header 238 are all made of aluminum and are joined together by brazing.

[0043] Fig. 10 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit 200 according to the second embodiment. As shown in Fig. 10, the housing 201 is rectangular in plan view, and has flow surfaces 261 through which air flows on three of its four side surfaces, and has a sealing surface 260 through which air does not flow on the remaining side surface. An outdoor heat exchanger 230 (230a to 230c) is disposed on each of the flow surfaces 261. That is, the housing 201 is provided with three outdoor heat exchangers 230.

[0044] As shown in Fig. 10, during cooling operation, the refrigerant flows inside the outdoor unit 200 as indicated by the diagonal line arrow. When the outdoor heat exchangers 230 arranged in the order of the rotation direction of the outdoor fan 250 (dashed black arrow) based on the sealing surface 260 are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230c, the outdoor heat exchangers 230 are connected by the refrigerant piping 203 so that the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c are on the upstream side of the refrigerant flow and the second outdoor heat exchanger 230b is on the downstream side of the refrigerant flow. Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows in a counterflow direction to the air flow (white arrow) during cooling operation.

[0045] (Effects of the second embodiment) FIG. 11 is a diagram showing the temperature difference between the air and the refrigerant in each region during cooling operation of the outdoor heat exchanger 230 according to the second embodiment. In the second embodiment, by configuring the outdoor heat exchanger 230 as described above, the gas refrigerant (solid black arrow) can flow in a counterflow direction to the air flow (white arrow) during cooling operation. Therefore, as shown in FIG. 11, the temperature difference between the air and the refrigerant can be made large in the entire region of the outdoor heat exchanger 230, and the heat exchanger performance can be improved. In addition, since it is no longer necessary to provide the liquid piping 236, which serves as the liquid refrigerant outlet, on the sealing surface 260 side, the stack width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved.

[0046] As described above, in the outdoor unit 200 according to the second embodiment, each of the three outdoor heat exchangers 230 has the flat tube groups 231 arranged in two rows in the air flow direction, and is arranged in the same direction in the height direction, and includes two distribution headers 234 into which one end of each flat tube group 231 is inserted, and a row-to-row header 238 into which the other ends of the two flat tube groups 231 are inserted. A refrigerant inlet is provided in the distribution header 234 into which one end of the flat tube group 231 arranged on the leeward side is inserted so that the gas refrigerant flows in a counterflow direction against the air flow during cooling operation.

[0047] According to the outdoor unit 200 according to the second embodiment, the gas refrigerant can flow counter to the air flow during cooling operation, so that the temperature difference between the air and the refrigerant can be made large over the entire area of ​​the outdoor heat exchanger 230, improving the heat exchanger performance. Also, since there is no need to provide the liquid piping 236, which serves as the liquid refrigerant outlet, on the sealing surface 260 side, the stack width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, improving the heat exchanger performance.

[0048] Embodiment 3 Hereinafter, the third embodiment will be described, but explanations of parts that overlap with the first and second embodiments will be omitted, and the same parts as or corresponding parts to the first and second embodiments will be given the same reference numerals.

[0049] Fig. 12 is a perspective view for explaining the configuration of outdoor heat exchanger 230 according to embodiment 3. Note that dashed arrows in Fig. 12 indicate the flow of refrigerant during cooling operation. Also, white arrows in Fig. 12 indicate the flow of air. As shown in Fig. 12, outdoor heat exchanger 230 according to embodiment 3 has a pair of headers, each of which is made up of two distribution headers 234, arranged vertically and separately. Also, the pair of headers are arranged in two rows in the air flow direction.

[0050] Between the two distribution headers 234, a group 231 is arranged, which is composed of a plurality of flat tubes 232 through which a refrigerant flows, with the flat surfaces facing each other so as to be parallel to each other, with the vertical direction being the tube extension direction. That is, the flat tube group 231 is arranged in two rows in the air flow direction. The flat tube 232 is a heat transfer tube having a flat cross section, a flat outer surface on the long side of the flat shape along the air flow direction, and a curved outer surface on the short side perpendicular to the long direction. The flat tube 232 according to the first embodiment is a multi-hole flat tube having a plurality of holes that become a flow path of the refrigerant inside the tube. In the third embodiment, the holes of the flat tube 232 are formed in the height direction to become a flow path between the two distribution headers 234. Between two adjacent flat tubes 232, a fin 233 having a wave shape and having a plurality of apexes joined to the flat surfaces of the flat tubes 232 is provided.

[0051] A distribution header 234 is provided on each of both ends of the flat tube group 231. Into the distribution header 234, a lower end portion or an upper end portion of the flat tubes 232 of the flat tube group 231 is inserted.

[0052] A hot gas refrigerant inlet (not shown) is formed at one end of one of the downwind distribution headers 234. In the third embodiment, as shown in FIG. 12, a hot gas refrigerant inlet is formed at one end of the lower distribution header 234 of the downwind distribution headers 234. The hot gas refrigerant inlet is connected to the refrigerant circuit 1 of the air conditioner via a gas pipe 237. Therefore, the downwind distribution header 234 in which the refrigerant inlet is formed is also called a gas header. The downwind distribution header 234 in which the refrigerant inlet is formed flows high-temperature and high-pressure gas refrigerant from the compressor 210 into the outdoor heat exchanger 230 during cooling operation, and flows low-temperature and low-pressure gas refrigerant after heat exchange in the outdoor heat exchanger 230 out to the refrigerant circuit 1 during heating operation. In other words, the hot gas refrigerant inlet is a hot gas refrigerant inlet. Here, the hot gas refrigerant is not limited to a single-phase gas refrigerant, and may be a two-phase gas-liquid refrigerant including a gas phase of 0°C or higher.

[0053] One end of the other distribution header 234 on the leeward side is connected to one end of one of the distribution headers 234 on the windward side by the inter-row connection pipe 239. Here, the other distribution header 234 on the leeward side and the one distribution header 234 on the windward side are arranged in the same direction in the height direction. In the third embodiment, as shown in FIG. 12, the other distribution header 234 on the leeward side and the one distribution header 234 on the windward side are both arranged on the upper side. Then, the inter-row connection pipe 239 flows the refrigerant of the other distribution header 234 on the leeward side to the one distribution header 234 on the windward side.

[0054] A liquid refrigerant outlet (not shown) is formed at one end of the other distribution header 234 on the windward side. In the third embodiment, as shown in FIG. 12, a liquid refrigerant outlet is formed at one end of the lower distribution header 234 among the distribution headers 234 on the windward side. The liquid refrigerant outlet is connected to the refrigerant circuit 1 of the air conditioner via a liquid piping 236. Therefore, the other distribution header 234 on the windward side is also called a liquid header. The other distribution header 234 on the windward side flows low-temperature, low-pressure two-phase refrigerant into the outdoor heat exchanger 230 during heating operation, and flows out low-temperature, high-pressure liquid refrigerant after heat exchange in the outdoor heat exchanger 230 during cooling operation. In other words, the liquid refrigerant outlet is a liquid refrigerant outflow section. Here, one distribution header 234 on the downwind side and the other distribution header 234 on the upwind side are arranged in the same direction in the height direction. In the third embodiment, as shown in FIG. 12, one distribution header 234 on the downwind side and the other distribution header 234 on the upwind side are both arranged on the lower side.

[0055] The flat tubes 232, the fins 233, and the distribution header 234 are all made of aluminum and are joined together by brazing.

[0056] Fig. 13 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit 200 according to the third embodiment. As shown in Fig. 13, the housing 201 is rectangular in plan view, and has flow surfaces 261 through which air flows on three of its four side surfaces, and has a sealing surface 260 through which air does not flow on the remaining side surface. An outdoor heat exchanger 230 (230a to 230c) is disposed on each of the flow surfaces 261. That is, the housing 201 is provided with three outdoor heat exchangers 230.

[0057] As shown in Fig. 13, during cooling operation, the refrigerant flows inside the outdoor unit 200 as indicated by the diagonal line arrow. When the outdoor heat exchangers 230 arranged in the order of the rotation direction of the outdoor fan 250 (dashed black arrow) based on the sealing surface 260 are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230c, the outdoor heat exchangers 230 are connected by the refrigerant piping 203 so that the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c are on the upstream side of the refrigerant flow and the second outdoor heat exchanger 230b is on the downstream side of the refrigerant flow. Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows in a counterflow direction to the air flow (white arrow) during cooling operation.

[0058] (Effects of the Third Embodiment) In the third embodiment, by configuring the outdoor heat exchanger 230 as described above, the gas refrigerant (solid black arrow) can flow in a counterflow direction to the air flow (white arrow) during cooling operation. Therefore, as shown in Fig. 11, the temperature difference between the air and the refrigerant can be made large over the entire area of ​​the outdoor heat exchanger 230, improving the heat exchanger performance. In addition, since it is no longer necessary to provide the liquid piping 236, which serves as the liquid refrigerant outlet, on the sealing surface 260 side, the stack width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, improving the heat exchanger performance.

[0059] As described above, in the outdoor unit 200 according to the third embodiment, each of the three outdoor heat exchangers 230 has the flat tube groups 231 arranged in two rows in the air flow direction, and includes four distribution headers 234 into which both ends of each flat tube group 231 are inserted. A refrigerant inlet is provided in the distribution header 234 into which one end of the flat tube group 231 arranged on the downwind side is inserted so that the gas refrigerant flows in a counterflow direction against the air flow during cooling operation, and the distribution header 234 into which the other end of the flat tube group 231 arranged on the downwind side is inserted is connected to the distribution header 234 arranged in the same height direction as the distribution header 234 and into which one end of the flat tube group 231 arranged on the upwind side is inserted by an inter-row connection pipe 239.

[0060] According to the outdoor unit 200 according to the third embodiment, the gas refrigerant can flow counter to the air flow during cooling operation, so that the temperature difference between the air and the refrigerant can be made large over the entire area of ​​the outdoor heat exchanger 230, improving the heat exchanger performance. Also, since there is no need to provide the liquid piping 236, which serves as the liquid refrigerant outlet, on the sealing surface 260 side, the stack width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, improving the heat exchanger performance.

[0061] Embodiment 4 Hereinafter, the fourth embodiment will be described, but explanations of parts that overlap with the first to third embodiments will be omitted, and the same parts as or corresponding parts to the first to third embodiments will be given the same reference numerals.

[0062] In the fourth embodiment, the surface area of ​​the fins 233 of the third outdoor heat exchanger 230c through which the wind with the lowest wind speed flows is configured to be smaller than the surface area of ​​the fins 233 of the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows. Specifically, the fin pitch or flat tube pitch of the third outdoor heat exchanger 230c is configured to be larger than that of the first outdoor heat exchanger 230a. Alternatively, the width in the row direction of each flat tube group 231 of the third outdoor heat exchanger 230c is configured to be smaller than the width in the row direction of each flat tube group 231 of the first outdoor heat exchanger 230a, or the number of rows of the third outdoor heat exchanger 230c is configured to be smaller than that of the first outdoor heat exchanger 230a. In this way, the third outdoor heat exchanger 230c has a smaller ventilation resistance than the first outdoor heat exchanger 230a, and the wind passes through more easily.

[0063] (Effects of the Fourth Embodiment) By adjusting the ventilation resistance of each outdoor heat exchanger 230, it is possible to suppress variation in heat exchanger performance among the outdoor heat exchangers 230, and therefore it is possible to suppress deterioration of heat exchanger performance due to differences in wind speed distribution.

[0064] As described above, the outdoor unit 200 according to the fourth embodiment is configured so that the ventilation resistance of the third outdoor heat exchanger 230c is smaller than the ventilation resistance of the first outdoor heat exchanger 230a.

[0065] According to the outdoor unit 200 according to the fourth embodiment, it is possible to suppress variations in heat exchanger performance in each outdoor heat exchanger 230 by adjusting the ventilation resistance of each outdoor heat exchanger 230. Therefore, it is possible to suppress a decrease in heat exchanger performance due to differences in wind speed distribution.

[0066] Embodiment 5. Hereinafter, the fifth embodiment will be described, but explanations of parts that overlap with the first to fourth embodiments will be omitted, and the same parts as or corresponding parts to the first to fourth embodiments will be given the same reference numerals.

[0067] Fig. 14 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit 200 according to the fifth embodiment. As shown in Fig. 14, the housing 201 is rectangular in plan view, and has flow surfaces 261 through which air flows on three of its four side surfaces, and has a sealing surface 260 through which air does not flow on the remaining side surface. An outdoor heat exchanger 230 (230a to 230c) is disposed on each of the flow surfaces 261. That is, the housing 201 is provided with three outdoor heat exchangers 230.

[0068] As shown in Fig. 14, during cooling operation, the refrigerant flows inside the outdoor unit 200 as indicated by the diagonal line arrow. When the outdoor heat exchangers 230 arranged in the order of the rotation direction of the outdoor fan 250 (dashed black arrow) based on the sealing surface 260 are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230c, the outdoor heat exchangers 230 are connected by the refrigerant piping 203 so that the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c are on the upstream side of the refrigerant flow and the second outdoor heat exchanger 230b is on the downstream side of the refrigerant flow. Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows in a counterflow direction to the air flow (white arrow) during cooling operation. As shown in FIG. 14, a throttle device 280 is provided in the refrigerant pipe 203 connecting the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c.

[0069] In the fifth embodiment, the refrigerant pipe 203 is configured so that the flow resistance R23 between the second outdoor heat exchanger 230b and the third outdoor heat exchanger 230c is larger than the flow resistance R21 between the second outdoor heat exchanger 230b and the first outdoor heat exchanger 230a (R23>R21). In order to increase the flow resistance by the refrigerant pipe 203, for example, the diameter of the refrigerant pipe 203 may be narrowed, the number of bent parts of the refrigerant pipe 203 may be increased, or the Cv value of the throttling device 280 may be reduced. Note that the throttling device 280 may be, for example, an electronic expansion valve, and the Cv value may be adjusted by the electronic expansion valve. In this way, a large amount of refrigerant flows in a place where a wind with a large wind speed flows, and a small amount of refrigerant flows in a place where a wind with a small wind speed flows.

[0070] (Effects of the Fifth Embodiment) By making the flow resistance R23 larger than the flow resistance R21, a refrigerant flow rate matching the wind speed distribution can be supplied to each outdoor heat exchanger 230, and the variation in heat exchanger performance in each outdoor heat exchanger 230 can be suppressed, thereby suppressing the deterioration of heat exchanger performance due to differences in wind speed distribution.

[0071] As described above, in the outdoor unit 200 according to embodiment 5, the flow resistance R23 between the second outdoor heat exchanger 230b and the third outdoor heat exchanger 230c is greater than the flow resistance R21 between the second outdoor heat exchanger 230b and the first outdoor heat exchanger 230a.

[0072] According to the outdoor unit 200 according to the fifth embodiment, by making the flow resistance R23 larger than the flow resistance R21, it is possible to supply a refrigerant flow rate that matches the airflow speed distribution to each outdoor heat exchanger 230, and it is possible to suppress variations in the heat exchanger performance of each outdoor heat exchanger 230. Therefore, it is possible to suppress a decrease in the heat exchanger performance due to differences in the airflow speed distribution. [Explanation of symbols]

[0073] 1 refrigerant circuit, 100 indoor unit, 110 indoor heat exchanger, 120 throttling device, 130 indoor fan, 200 outdoor unit, 201 housing, 202 outlet, 203 refrigerant piping, 210 compressor, 220 flow path switching device, 230 outdoor heat exchanger, 230a outdoor heat exchanger, 230b outdoor heat exchanger, 230c outdoor heat exchanger, 231 flat tube group, 232 flat tube, 233 fin, 234 distribution header, 236 liquid piping, 237 gas piping, 238 row transfer header, 239 inter-row connection piping, 240 accumulator, 250 outdoor fan, 260 sealing surface, 261 flow surface, 280 throttling device, 300 refrigerant piping.

Claims

1. A housing having an air outlet at the center of an upper portion and a rectangular shape in a plan view; Three outdoor heat exchangers provided inside the housing; an outdoor fan disposed above the three outdoor heat exchangers and configured to blow air upward from the air outlet; Each of the three outdoor heat exchangers is The flat tube group is made up of a plurality of flat tubes through which a refrigerant flows, the flat surfaces of which are opposed to each other so as to be parallel to each other, with the tube extension direction being in the up-down direction, the housing has three of four side surfaces through which air flows, and the remaining side surface has a sealing surface through which air does not flow, The three outdoor heat exchangers are provided along the flow surface, When the three outdoor heat exchangers arranged in the order of the rotation direction of the outdoor fan with respect to the sealing surface are respectively a first outdoor heat exchanger, a second outdoor heat exchanger, and a third outdoor heat exchanger, the three outdoor heat exchangers are connected such that the first outdoor heat exchanger and the third outdoor heat exchanger are on the upstream side of the refrigerant flow and the second outdoor heat exchanger is on the downstream side of the refrigerant flow during cooling operation. outdoor unit.

2. Each of the three outdoor heat exchangers is The flat tube groups are arranged in two rows in the air flow direction, Two distribution headers arranged in the same direction in the height direction and into which one end of each of the flat tube bundles is inserted; a row-to-row header into which the other ends of the two flat tube bundles are inserted, A refrigerant inlet is provided in the distribution header into which one end of the flat tube group arranged on the leeward side is inserted so that the gas refrigerant flows in a counterflow direction against the air flow during cooling operation. The outdoor unit according to claim 1 .

3. Each of the three outdoor heat exchangers is The flat tube groups are arranged in two rows in the air flow direction, four distribution headers into which both ends of each of the flat tube bundles are inserted; a refrigerant inlet is provided in the distribution header into which one end of the flat tube group arranged on the leeward side is inserted so that the gas refrigerant flows in a counterflow direction against the air flow during cooling operation; The distribution header into which the other end of the flat tube group arranged on the leeward side is inserted and the distribution header arranged in the same height direction as the distribution header and into which one end of the flat tube group arranged on the windward side is inserted are connected by an inter-row connection pipe. The outdoor unit according to claim 1 .

4. The third outdoor heat exchanger is configured to have a ventilation resistance smaller than the ventilation resistance of the first outdoor heat exchanger. The outdoor unit according to any one of claims 1 to 3.

5. a flow resistance between the second outdoor heat exchanger and the third outdoor heat exchanger is greater than a flow resistance between the second outdoor heat exchanger and the first outdoor heat exchanger; The outdoor unit according to any one of claims 1 to 3.

6. An outdoor unit according to any one of claims 1 to 3; An indoor unit and Air conditioning equipment.

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