WO2023188421A1 - Outdoor unit and air conditioner equipped with same - Google Patents

Outdoor unit and air conditioner equipped with same Download PDF

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Publication number
WO2023188421A1
WO2023188421A1 PCT/JP2022/016980 JP2022016980W WO2023188421A1 WO 2023188421 A1 WO2023188421 A1 WO 2023188421A1 JP 2022016980 W JP2022016980 W JP 2022016980W WO 2023188421 A1 WO2023188421 A1 WO 2023188421A1
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WO
WIPO (PCT)
Prior art keywords
outdoor heat
heat exchanger
outdoor
refrigerant
flow
Prior art date
Application number
PCT/JP2022/016980
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French (fr)
Japanese (ja)
Inventor
康平 名島
洋次 尾中
周平 水谷
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2022/016980 priority Critical patent/WO2023188421A1/en
Publication of WO2023188421A1 publication Critical patent/WO2023188421A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/46—Component arrangements in separate outdoor units
    • F24F1/48—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow
    • F24F1/50—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow with outlet air in upward direction

Definitions

  • the present disclosure relates to a top-flow outdoor unit and an air conditioner equipped with the same.
  • a plurality of flat tubes arranged at intervals in the horizontal direction with the vertical direction as the tube stretching direction, a plurality of fins connected between adjacent flat tubes to transfer heat to the flat tubes, and a plurality of flat tubes arranged at intervals in the horizontal direction.
  • a top-flow type outdoor unit in which an outdoor heat exchanger having headers provided at the upper and lower ends of the tubes, and an outdoor fan that blows air upwards are provided inside the casing (for example, , see Patent Document 1).
  • an outdoor heat exchanger is arranged in the circumferential direction of the casing, and an outdoor fan is arranged above the outdoor heat exchanger and at the top of the casing.
  • Patent Document 1 since a difference occurs in the wind speed distribution in the circumferential direction of the casing, a difference occurs in the wind speed passing through each heat exchanger, which causes a biased heat load distribution.
  • the heat exchange amount is large, and the temperature difference between the refrigerant and the air is small, and the region of the supercooled liquid, which is a region with a small contribution rate as an outdoor heat exchanger, becomes large.
  • the amount of heat exchanged is small, and the area of the supercooled liquid is small.
  • the present disclosure has been made to solve the above-mentioned problems, and aims to provide an outdoor unit that suppresses deterioration in heat exchange performance due to differences in wind speed distribution, and an air conditioner equipped with the same.
  • An outdoor unit includes a housing having an air outlet in the center of the upper part and having a rectangular shape in plan view, three outdoor heat exchangers provided inside the housing, and the three outdoor heat exchangers.
  • an outdoor fan disposed above the exchanger and blowing air upward from the outlet; each of the three outdoor heat exchangers is flattened so as to be parallel to each other with the vertical direction being the pipe extending direction;
  • the casing includes a flat tube group composed of a plurality of flat tubes whose surfaces face each other and through which refrigerant flows, and the housing has a flow surface through which air flows on three of the four sides, and the remaining one has a flow surface through which air flows.
  • a side surface has a sealing surface through which air does not circulate, and the three outdoor heat exchangers are provided along the circulation surface, and are arranged in the order of the rotation direction of the outdoor fan with the sealing surface as a reference.
  • the three outdoor heat exchangers are the first outdoor heat exchanger, the second outdoor heat exchanger, and the third outdoor heat exchanger, during cooling operation, the first outdoor heat exchanger
  • the three outdoor heat exchangers are connected such that the heat exchanger and the third outdoor heat exchanger are connected to the upstream side of the refrigerant flow, and the second outdoor heat exchanger is connected to the downstream side of the refrigerant flow.
  • an air conditioner according to the present disclosure includes the above-mentioned outdoor unit and an indoor unit.
  • refrigerant is supplied 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.
  • the refrigerants are combined at the second outdoor heat exchanger where air flows in parallel and has an intermediate wind speed.
  • the first outdoor heat exchanger and the third outdoor heat exchanger function as upstream heat exchangers
  • the second outdoor heat exchanger, through which wind with an intermediate wind speed flows functions as a downstream heat exchanger.
  • the refrigerant flows in a gas-liquid two-phase state between the outdoor heat exchanger where the wind with the highest wind speed flows and the outdoor heat exchanger where the wind with the lowest wind speed flows, and the supercooled liquid area is Hard to occur.
  • the supercooled liquid area is treated with an outdoor heat exchanger through which wind at an intermediate speed flows. As a result, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed.
  • FIG. 1 is a diagram showing the configuration of an air conditioner including an outdoor unit according to Embodiment 1.
  • FIG. 1 is a schematic diagram illustrating the configuration of an outdoor unit according to Embodiment 1.
  • FIG. 1 is a perspective view illustrating the configuration of an outdoor heat exchanger according to Embodiment 1.
  • FIG. 3 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to the first embodiment.
  • FIG. 3 is a schematic plan view illustrating the flow of refrigerant during heating operation of the outdoor unit according to the first embodiment.
  • FIG. 3 is a diagram showing the temperature distribution of each outdoor heat exchanger during heating operation of the outdoor unit according to the first embodiment.
  • FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the modified example of the outdoor unit according to the first embodiment.
  • FIG. 6 is a schematic plan view illustrating the flow of refrigerant during heating operation of the modified example of the outdoor unit according to the first embodiment.
  • FIG. 2 is a perspective view illustrating the configuration of an outdoor heat exchanger according to a second embodiment.
  • FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to Embodiment 2.
  • FIG. FIG. 7 is a diagram showing the temperature difference between air and refrigerant in each region during cooling operation of the outdoor heat exchanger according to Embodiment 2;
  • FIG. 7 is a perspective view illustrating the configuration of an outdoor heat exchanger according to Embodiment 3.
  • FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to Embodiment 3;
  • FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to Embodiment 5.
  • FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to Embodiment 5.
  • FIG. 1 is a diagram showing the configuration of an air conditioner including an outdoor unit 200 according to the first embodiment.
  • 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 path switching device 220, and an outdoor heat exchanger 230.
  • the indoor unit 100 includes an indoor heat exchanger 110 and a throttle device 120.
  • the compressor 210, the flow path switching device 220, the outdoor heat exchanger 230, the expansion device 120, and the indoor heat exchanger 110 are sequentially connected through a refrigerant pipe 300, forming a refrigerant circuit 1 in which refrigerant circulates.
  • one outdoor unit 200 and one indoor unit 100 are connected by a refrigerant pipe 300, but the number of connected outdoor units 200 and indoor units 100 is , but not limited to.
  • the indoor unit 100 includes an indoor fan 130 in addition to an indoor heat exchanger 110 and a throttle device 120.
  • the expansion device 120 depressurizes and expands the refrigerant.
  • the throttle device 120 is, for example, an electronic expansion valve that can adjust the opening degree of the throttle, and by adjusting the opening degree, it controls the refrigerant pressure flowing into the indoor heat exchanger 110 during cooling operation, and controls the refrigerant pressure flowing into the indoor heat exchanger 110 during heating operation. During operation, the pressure of the refrigerant flowing into the outdoor heat exchanger 230 is controlled.
  • the indoor heat exchanger 110 exchanges heat between indoor air, which is a space to be air-conditioned, and a refrigerant.
  • the indoor heat exchanger 110 functions as a condenser to condense and liquefy the refrigerant. Further, during cooling operation, the indoor heat exchanger 110 functions as an evaporator to evaporate and vaporize the refrigerant.
  • the indoor fan 130 causes indoor air to pass through the indoor heat exchanger 110, and supplies the air that has passed through the indoor heat exchanger 110 into the room.
  • FIG. 2 is a schematic diagram illustrating the configuration of outdoor unit 200 according to the first embodiment.
  • the outdoor unit 200 according to the first embodiment is a top flow type having an outlet 202 of an outdoor fan 250 in the upper center of a housing 201, and blows air upward from the outlet 202.
  • FIG. 2 only shows the upper part of the outdoor heat exchanger 230 disposed at the top of the housing 201 for explanation, the outdoor unit 200 according to the first embodiment is located close to the bottom of the housing 201.
  • the outdoor heat exchanger 230 is arranged up to the position.
  • the outdoor unit 200 includes a compressor 210, a flow path switching device 220, an outdoor heat exchanger 230, and an accumulator 240 as devices that constitute the refrigerant circuit 1.
  • the compressor 210 sucks in low-temperature, low-pressure refrigerant, compresses the sucked refrigerant, and discharges high-temperature, high-pressure refrigerant.
  • the compressor 210 is, for example, an inverter compressor whose capacity, which is the amount of output per unit time, is controlled by changing the operating frequency.
  • the flow path switching device 220 is, for example, a four-way valve, and switches between cooling operation and heating operation by switching the flow direction of the refrigerant. Note that as the flow path switching device 220, a combination of a two-way valve and a three-way valve may be used instead of the four-way valve.
  • 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 heating 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 when cooling operation is performed.
  • the accumulator 240 is installed on the suction side of the compressor 210, allows gaseous refrigerant (hereinafter referred to as gas refrigerant) to pass therethrough, and stores liquid refrigerant (hereinafter referred to as liquid refrigerant).
  • gas refrigerant gaseous refrigerant
  • liquid refrigerant liquid refrigerant
  • the outdoor heat exchanger 230 exchanges heat between the refrigerant and outdoor air.
  • the refrigerant is a fluid that serves as a heat exchange medium.
  • the outdoor heat exchanger 230 functions as an evaporator during heating operation, and evaporates and vaporizes the refrigerant.
  • the outdoor heat exchanger 230 functions as a condenser and a supercooler, condenses and liquefies the refrigerant, and performs supercooling.
  • the outdoor fan 250 is disposed above the outdoor heat exchanger 230 and is driven to allow air from outside the outdoor unit 200 to pass through the outdoor heat exchanger 230, and then blows the air upward from the outlet 202.
  • the condensed and liquefied refrigerant passes through a throttling device 120 .
  • the pressure is reduced.
  • the refrigerant which has been depressurized by the expansion device 120 and becomes a gas-liquid two-phase state, passes through the outdoor heat exchanger 230.
  • the refrigerant that is evaporated and gasified by exchanging heat with the outdoor air sent from the outdoor fan 250 passes through the flow path switching device 220 and the accumulator 240, and is returned to the compressor 210. is inhaled.
  • the refrigerant of the air conditioner circulates and air conditioning related to heating is performed.
  • Dotted arrows in FIG. 1 indicate the flow of refrigerant during 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 .
  • the refrigerant passes through the outdoor heat exchanger 230 and is condensed and liquefied by exchanging heat with the outdoor air supplied by the outdoor fan 250 , and then passes through the expansion device 120 .
  • the pressure is reduced.
  • the refrigerant which has been depressurized by the expansion device 120 and becomes a gas-liquid two-phase state, passes through the indoor heat exchanger 110.
  • the refrigerant that is evaporated and gasified by exchanging heat with the air in the air-conditioned space passes through the flow path switching device 220 and the accumulator 240, and is returned to the compressor 210. Inhaled.
  • the refrigerant of the air conditioner circulates, and air conditioning related to cooling is performed.
  • FIG. 3 is a perspective view illustrating the configuration of outdoor heat exchanger 230 according to the first embodiment. Note that the broken line arrows in FIG. 3 indicate the flow of refrigerant during cooling operation. Moreover, the white arrow in FIG. 3 indicates the flow of air. As shown in FIG. 3, in the outdoor heat exchanger 230 according to the first embodiment, a pair of headers including two distribution headers 234 are arranged vertically separated in the height direction.
  • the flat tube 232 is a multi-hole flat tube that has a plurality of holes that serve as refrigerant flow paths inside the tube.
  • the holes in the flat tube 232 serve as flow paths between the two distribution headers 234, so they are formed facing in the height direction.
  • fins 233 are provided which have a wave shape and have a plurality of tops joined to the flat surfaces of the flat tubes 232 .
  • Distribution headers 234 are provided at both ends of the flat tube group 231, respectively.
  • the lower ends or upper ends of the flat tubes 232 of the flat tube group 231 are inserted into the distribution header 234 .
  • a hot gas refrigerant inlet (not shown) is formed at one end of one distribution header 234.
  • a hot gas refrigerant inlet is formed at one end of the lower distribution header 234.
  • the hot gas refrigerant inlet is connected via a gas pipe 237 to the refrigerant circuit 1 of the air conditioner, for example, the discharge side of the compressor 210 during cooling operation. Therefore, the distribution header 234 in which the refrigerant inlet is formed is also called a gas header.
  • the distribution header 234 in which this refrigerant inlet is formed allows the 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 outdoor heat exchange during heating operation.
  • the low-temperature, low-pressure gas refrigerant that has undergone heat exchange in the container 230 flows out into the refrigerant circuit 1.
  • the hot gas refrigerant inlet becomes a hot gas refrigerant inlet.
  • the hot gas refrigerant is not limited to a gas single-phase refrigerant, but may be a gas-liquid two-phase refrigerant containing a gas phase of 0° C. or higher.
  • a liquid refrigerant outlet (not shown) is formed at one end of the other distribution header 234.
  • 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 a liquid pipe 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 allows the low-temperature, low-pressure two-phase refrigerant to flow into the outdoor heat exchanger 230 during heating operation, and allows the low-temperature, high-pressure two-phase refrigerant after heat exchange in the outdoor heat exchanger 230 during cooling operation to flow into the outdoor heat exchanger 230. Drain liquid refrigerant. In other words, the liquid refrigerant outlet becomes a liquid refrigerant outlet.
  • the plurality of flat tubes 232, the plurality of fins 233, and the distribution header 234 are all made of aluminum and are joined by brazing.
  • FIG. 4 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit 200 according to the first embodiment.
  • FIG. 5 is a schematic plan view illustrating the flow of refrigerant during heating operation of outdoor unit 200 according to the first embodiment.
  • FIG. 6 is a diagram showing the temperature distribution of each outdoor heat exchanger 230 during heating operation of the outdoor unit 200 according to the first embodiment.
  • the casing 201 has a rectangular shape in plan view, and has circulation surfaces 261 through which air flows on three of the four sides, and air flows through the remaining one side. It has a sealing surface 260 that is not Furthermore, outdoor heat exchangers 230 (230a to 230c) are arranged along each circulation surface 261, respectively. That is, three outdoor heat exchangers 230 are provided inside the housing 201.
  • refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow.
  • the outdoor heat exchangers 230 arranged in the order of rotation direction (broken line black arrow) of the outdoor fan 250 with the sealing surface 260 as a reference are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230a, respectively.
  • the outdoor heat exchanger 230c is assumed as The outdoor heat exchangers 230 are connected by refrigerant pipes 203, respectively.
  • the refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow.
  • the outdoor heat exchangers 230 are arranged so that the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c are on the downstream side of the refrigerant flow, and the second outdoor heat exchanger 230b is on the upstream side of the refrigerant flow. They are connected by refrigerant pipes 203, respectively.
  • FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the modified example of the outdoor unit 200 according to the first embodiment.
  • FIG. 8 is a schematic plan view illustrating the flow of refrigerant during heating operation of the modified example of the outdoor unit 200 according to the first embodiment.
  • one outdoor fan 250 is provided at the center of the upper part of the housing 201, but the present invention is not limited to this, and if all the fans rotate in the same direction, as shown in FIGS. 7 and 8, Two or more outdoor fans 250 may be provided in the upper center of the housing 201. Also in the modification of the first embodiment shown in FIGS. 7 and 8, the arrangement of the three outdoor heat exchangers 230 is the same as in the first embodiment shown in FIGS. 4 and 5.
  • the refrigerant is applied 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.
  • the refrigerants are made to merge at the second outdoor heat exchanger 230c where wind with an intermediate wind speed flows.
  • the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c function as upstream heat exchangers
  • the second outdoor heat exchanger 230c through which wind with an intermediate wind speed flows, acts as a downstream heat exchanger. Functions as a heat exchanger.
  • the refrigerant flows in a gas-liquid two-phase state in the outdoor heat exchanger 230 where the wind with the highest wind speed flows and the outdoor heat exchanger 230 where the wind with the lowest wind speed flows, and the refrigerant flows in a gas-liquid two-phase state. Areas are less likely to occur. Further, the region of the supercooled liquid is treated with an outdoor heat exchanger 230 through which wind having an intermediate speed flows. As a result, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed. In addition, as shown in FIGS.
  • the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows is selected because the difference between the air temperature and the refrigerant temperature is large and the amount of heat exchange is large. In other words, it can function as a main heat exchanger with high heat exchanger performance. Therefore, the occurrence of uneven frost formation on the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows is suppressed, so that it is possible to suppress a decrease in the heating capacity under low temperature conditions.
  • the outdoor unit 200 includes a casing 201 that has an air outlet 202 at the center of the top and is rectangular in plan view, and three outdoor heat exchangers provided inside the casing 201. 230, and an outdoor fan 250 that is arranged above the three outdoor heat exchangers 230 and blows air upward from the air outlet 202.
  • each of the three outdoor heat exchangers 230 is a flat tube composed of a plurality of flat tubes 232 in which the refrigerant flows, with the vertical direction being the tube extending direction and flat surfaces facing each other so as to be parallel to each other.
  • a plurality of fins 233 are arranged between two adjacent flat tubes 232 and joined to the flat surface of the flat tubes 232.
  • the housing 201 has a circulation surface 261 through which air flows on three of the four sides, and a sealing surface 260 through which air does not flow on the remaining one side.
  • the three outdoor heat exchangers 230 are each provided along the flow surface 261, and the three outdoor heat exchangers 230 are arranged in the order of the rotational direction of the outdoor fan 250 with the sealing surface 260 as a reference.
  • the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230c are used, during cooling operation, the first outdoor heat exchanger 230a and the third outdoor heat exchanger
  • the three outdoor heat exchangers 230 are connected such that the heat exchanger 230c is on the upstream side of the refrigerant flow, and the second outdoor heat exchanger 230b is on the downstream side of the refrigerant flow.
  • 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.
  • the refrigerants flow in parallel to each other, and the refrigerants are combined at the second outdoor heat exchanger 230b, where wind with an intermediate wind speed flows.
  • the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c function as upstream heat exchangers
  • the second outdoor heat exchanger 230b, through which wind with an intermediate wind speed flows acts as a downstream heat exchanger. Functions as a heat exchanger.
  • the refrigerant flows in a gas-liquid two-phase state in the outdoor heat exchanger 230 where the wind with the highest wind speed flows and the outdoor heat exchanger 230 where the wind with the lowest wind speed flows, and the refrigerant flows in a gas-liquid two-phase state. Areas are less likely to occur. Further, the region of the supercooled liquid is treated with an outdoor heat exchanger 230 through which wind having an intermediate speed flows. As a result, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed.
  • Embodiment 2 will be described below, but the description of parts that overlap with Embodiment 1 will be omitted, and the same or corresponding parts as in Embodiment 1 will be given the same reference numerals.
  • FIG. 9 is a perspective view illustrating the configuration of an outdoor heat exchanger 230 according to the second embodiment. Note that the broken line arrows in FIG. 9 indicate the flow of refrigerant during cooling operation. Moreover, the white arrow in FIG. 9 indicates the flow of air. As shown in FIG. 9, in the outdoor heat exchanger 230 according to the second embodiment, a pair of headers including two distribution headers 234 and a row transfer header 238 are arranged vertically and vertically. .
  • the flat tube 232 is a multi-hole flat tube that has a plurality of holes that serve as refrigerant flow paths inside the tube.
  • the holes in the flat tube 232 are formed to face in the height direction because they serve as flow paths between the distribution header 234 and the row-crossing header 238.
  • fins 233 are provided which have a wave shape and have a plurality of tops joined to the flat surfaces of the flat tubes 232 .
  • a distribution header 234 is provided at one end of each of the two flat tube groups 231. These two distribution headers 234 are arranged in the same direction in the height direction. The lower ends or upper ends of the flat tubes 232 of the flat tube group 231 are inserted into the distribution header 234 . In the second embodiment, as shown in FIG. 9, the lower ends of the flat tubes 232 of the flat tube group 231 are inserted into the distribution header 234. Furthermore, a row transfer header 238 is provided at the other end of the two flat tube groups 231. The upper end portions or lower end portions of the flat tubes 232 of the two flat tube groups 231 are inserted into the row transfer header 238 . In the second embodiment, as shown in FIG.
  • the upper ends of the flat tubes 232 of the two flat tube groups 231 are inserted into the row transfer header 238. Then, the row transfer header 238 distributes the refrigerant that has merged from the flat tubes 232 of one flat tube group 231 to the flat tubes 232 of the other flat tube group 231.
  • 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 leeward side).
  • the hot gas refrigerant inlet is connected to the refrigerant circuit 1 of the air conditioner via a gas pipe 237. Therefore, the leeward distribution header 234 in which the hot gas refrigerant inlet is formed is also called a gas header.
  • This leeward side distribution header 234 allows high-temperature, high-pressure 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 to flow into the outdoor heat exchanger 230 during heating operation.
  • the gas refrigerant is allowed to flow into the refrigerant circuit 1.
  • the hot gas refrigerant inlet becomes a hot gas refrigerant inlet.
  • the hot gas refrigerant is not limited to a gas single-phase refrigerant, but may be a gas-liquid two-phase refrigerant containing a gas phase of 0° C. or higher.
  • 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 a liquid pipe 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 allows low-temperature, low-pressure two-phase refrigerant to flow 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. let In other words, the liquid refrigerant outlet becomes a liquid refrigerant outlet.
  • the plurality of flat tubes 232, the plurality of fins 233, the distribution header 234, and the row transfer header 238 are all made of aluminum and are joined by brazing.
  • 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.
  • the casing 201 has a rectangular shape in plan view, and has a flow surface 261 through which air flows on three of the four sides, and a seal that prevents air flow on the remaining one side. It has a surface 260.
  • Outdoor heat exchangers 230 (230a to 230c) are arranged on each circulation surface 261, respectively. That is, the housing 201 is provided with three outdoor heat exchangers 230.
  • refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow.
  • the outdoor heat exchangers 230 arranged in the order of rotation direction (broken line black arrow) of the outdoor fan 250 with the sealing surface 260 as a reference are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230a, respectively.
  • the outdoor heat exchanger 230c is assumed as The outdoor heat exchangers 230 are connected by refrigerant pipes 203, respectively.
  • Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows counter to the air flow (white arrow) during cooling operation.
  • FIG. 11 is a diagram showing the temperature difference between air and refrigerant in each region during cooling operation of the outdoor heat exchanger 230 according to the second embodiment.
  • the gas refrigerant solid black arrow
  • the air flow white arrow
  • the width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved. can.
  • each of the three outdoor heat exchangers 230 has flat tube groups 231 arranged in two rows in the air flow direction, and 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-crossing header 238 into which the other end of the two flat tube groups 231 is inserted.
  • a refrigerant inlet is provided in the distribution header 234 into which one end of the flat tube group 231 disposed on the leeward side is inserted so that the gas refrigerant flows counter-currently to the air flow during cooling operation.
  • the outdoor unit 200 since the gas refrigerant can flow counter to the air flow during cooling operation, the temperature difference between the air and the refrigerant can be reduced to the entire area of the outdoor heat exchanger 230. It is possible to obtain a large amount of heat and improve heat exchanger performance. Furthermore, since it is not necessary to provide the liquid piping 236 that serves as a liquid refrigerant outlet on the sealing surface 260 side, the width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved. can.
  • Embodiment 3 will be described below, but the description of parts that overlap with Embodiments 1 and 2 will be omitted, and the same or corresponding parts as in Embodiments 1 and 2 will be given the same reference numerals.
  • FIG. 12 is a perspective view illustrating the configuration of an outdoor heat exchanger 230 according to the third embodiment. Note that the broken line arrows in FIG. 12 indicate the flow of refrigerant during cooling operation. Moreover, the white arrow in FIG. 12 indicates the flow of air. As shown in FIG. 12, in the outdoor heat exchanger 230 according to the third embodiment, a pair of headers made up of two distribution headers 234 are arranged vertically separated in the height direction. Further, the pair of headers are arranged in two rows in the air flow direction.
  • the flat tube 232 is a multi-hole flat tube that has a plurality of holes that serve as refrigerant flow paths inside the tube.
  • the holes in the flat tube 232 serve as flow paths between the two distribution headers 234, so they are formed facing in the height direction.
  • fins 233 are provided which have a wave shape and have a plurality of tops joined to the flat surfaces of the flat tubes 232 .
  • Distribution headers 234 are provided at both ends of the flat tube group 231, respectively.
  • the lower ends or upper ends of the flat tubes 232 of the flat tube group 231 are inserted into the distribution header 234 .
  • a hot gas refrigerant inlet (not shown) is formed at one end of one of the distribution headers 234 on the leeward side.
  • a hot gas refrigerant inlet is formed at one end of the lower distribution header 234 among the distribution headers 234 on the leeward side.
  • the hot gas refrigerant inlet is connected to the refrigerant circuit 1 of the air conditioner via a gas pipe 237. Therefore, one distribution header 234 on the leeward side in which a refrigerant inlet is formed is also called a gas header.
  • One of the distribution headers 234 on the leeward side in which this refrigerant inlet is formed allows the high-temperature, high-pressure gas refrigerant from the compressor 210 to flow into the outdoor heat exchanger 230 during cooling operation, and allows the outdoor heat exchanger 230 to heat the refrigerant during heating operation.
  • the low-temperature, low-pressure gas refrigerant after being replaced is made to flow into the refrigerant circuit 1.
  • the hot gas refrigerant inlet becomes a hot gas refrigerant inlet.
  • the hot gas refrigerant is not limited to a gas single-phase refrigerant, but may be a gas-liquid two-phase refrigerant containing a gas phase of 0° C. or higher.
  • 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 an inter-row connection pipe 239.
  • the other distribution header 234 on the leeward side and one distribution header 234 on the windward side are arranged in the same direction in the height direction.
  • the other distribution header 234 on the leeward side and one distribution header 234 on the windward side are both arranged on the upper side. Then, the inter-row connecting pipe 239 allows the refrigerant in the other distribution header 234 on the leeward side to flow to one distribution header 234 on the windward side.
  • a liquid refrigerant outlet (not shown) is formed at one end of the other distribution header 234 on the windward side.
  • 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 pipe 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 allows the low-temperature, low-pressure two-phase refrigerant to flow into the outdoor heat exchanger 230 during heating operation, and the low-temperature, high-pressure liquid refrigerant after heat exchange in the outdoor heat exchanger 230 during cooling operation. to flow out.
  • the liquid refrigerant outlet becomes a liquid refrigerant outlet.
  • one distribution header 234 on the leeward side and the other distribution header 234 on the windward side are arranged in the same direction in the height direction.
  • one distribution header 234 on the leeward side and the other distribution header 234 on the windward side are both arranged on the lower side.
  • the plurality of flat tubes 232, the plurality of fins 233, and the distribution header 234 are all made of aluminum and are joined by brazing.
  • 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.
  • the casing 201 has a rectangular shape in plan view, and has circulation surfaces 261 on three of the four sides through which air flows, and the remaining one side is sealed so that air does not flow therethrough. It has a surface 260.
  • Outdoor heat exchangers 230 (230a to 230c) are arranged on each circulation surface 261, respectively. That is, the housing 201 is provided with three outdoor heat exchangers 230.
  • refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow.
  • the outdoor heat exchangers 230 arranged in the order of rotation direction (broken line black arrow) of the outdoor fan 250 with the sealing surface 260 as a reference are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230a, respectively.
  • the outdoor heat exchanger 230c is assumed as The outdoor heat exchangers 230 are connected by refrigerant pipes 203, respectively.
  • Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows counter to the air flow (white arrow) during cooling operation.
  • the gas refrigerant (solid black arrow) can flow counter 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, and the heat exchanger performance can be improved. Furthermore, since it is not necessary to provide the liquid piping 236 that serves as a liquid refrigerant outlet on the sealing surface 260 side, the width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved. can.
  • the flat tube groups 231 are arranged in two rows in the air flow direction. It has four distribution headers 234 inserted at both ends.
  • a refrigerant inlet is provided in the distribution header 234 into which one end of the flat tube group 231 disposed on the leeward side is inserted so that the gas refrigerant flows in a counterflow to the air flow during cooling operation.
  • the distribution header 234 into which one end has been inserted is connected to the distribution header 234 through an inter-row connection pipe 239 .
  • the outdoor unit 200 since the gas refrigerant can flow counter to the air flow during cooling operation, the temperature difference between the air and the refrigerant can be reduced to the entire area of the outdoor heat exchanger 230. It is possible to obtain a large amount of heat and improve heat exchanger performance. Furthermore, since it is not necessary to provide the liquid pipe 236 that serves as a liquid refrigerant outlet on the sealing surface 260 side, the width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved. can.
  • Embodiment 4 will be described below, but the description of parts that overlap with Embodiments 1 to 3 will be omitted, and the same or corresponding parts as in Embodiments 1 to 3 will be given the same reference numerals.
  • 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 larger 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. It is designed to be small. 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.
  • the width in the column direction of each flat tube group 231 of the third outdoor heat exchanger 230c is smaller than the width in the column 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 smaller than that of the first outdoor heat exchanger 230a.
  • the third outdoor heat exchanger 230c has a lower ventilation resistance than the first outdoor heat exchanger 230a, making it easier for air to pass through.
  • the outdoor unit 200 according to the fourth embodiment is configured such that the ventilation resistance of the third outdoor heat exchanger 230c is smaller than the ventilation resistance of the first outdoor heat exchanger 230a.
  • the outdoor unit 200 by adjusting the ventilation resistance of each outdoor heat exchanger 230, variations in heat exchanger performance among the outdoor heat exchangers 230 can be suppressed. Therefore, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed.
  • Embodiment 5 will be described below, but the description of parts that overlap with Embodiments 1 to 4 will be omitted, and the same or corresponding parts as in Embodiments 1 to 4 will be given the same reference numerals.
  • 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.
  • the casing 201 has a rectangular shape in plan view, and has a circulation surface 261 through which air flows on three of the four sides, and a seal that prevents air circulation on the remaining one side. It has a surface 260.
  • Outdoor heat exchangers 230 (230a to 230c) are arranged on each circulation surface 261, respectively. That is, the housing 201 is provided with three outdoor heat exchangers 230.
  • refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow.
  • the outdoor heat exchangers 230 arranged in the order of rotation direction (broken line black arrow) of the outdoor fan 250 with the sealing surface 260 as a reference are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230a, respectively.
  • the outdoor heat exchanger 230c is assumed as The outdoor heat exchangers 230 are connected by refrigerant pipes 203, respectively.
  • Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows counter to the air flow (white arrow) during cooling operation.
  • 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.
  • the flow resistance R23 between the second outdoor heat exchanger 230b and the third outdoor heat exchanger 230c is the same as that between the second outdoor heat exchanger 230b and the first outdoor heat exchanger 230a.
  • the refrigerant pipe 203 is configured so that the flow resistance between the two ends is greater than the flow resistance R21 (R23>R21).
  • the diameter of the refrigerant pipe 203 can be made smaller, the number of bent parts of the refrigerant pipe 203 can be increased, or the Cv value of the expansion device 280 can be made smaller.
  • the expansion device 280 is, for example, an electronic expansion valve, and the Cv value may be adjusted by the electronic expansion valve.
  • the flow resistance R21 between the second outdoor heat exchanger 230b and the first outdoor heat exchanger 230a is higher than the flow resistance R21 between the second outdoor heat exchanger 230b and the third outdoor heat exchanger 230a.
  • the flow resistance R23 between the outdoor heat exchanger 230c and the outdoor heat exchanger 230c is larger.
  • the outdoor unit 200 by making the flow resistance R23 larger than the flow resistance R21, a refrigerant flow rate that matches the wind speed distribution can be supplied to each outdoor heat exchanger 230, and each outdoor Variations in heat exchanger performance in the heat exchanger 230 can be suppressed. Therefore, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed.
  • 1 Refrigerant circuit 100 Indoor unit, 110 Indoor heat exchanger, 120 Throttle 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 Column transfer header , 239 Inter-row connection piping, 240 Accumulator, 250 Outdoor fan, 260 Sealing surface, 261 Flow surface, 280 Throttle device, 300 Refrigerant piping.

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
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  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

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

室外機およびそれを備えた空気調和装置Outdoor unit and air conditioner equipped with it
　本開示は、トップフロー型の室外機およびそれを備えた空気調和装置に関するものである。 The present disclosure relates to a top-flow outdoor unit and an air conditioner equipped with the same.
　従来、鉛直方向を管延伸方向とし、水平方向に間隔を空けて配列された複数の扁平管と、隣り合う扁平管の間にわたって接続され、扁平管に伝熱する複数のフィンと、複数の扁平管の上端部および下端部にそれぞれ設けられたヘッダとを有する室外熱交換器と、上向きに空気を吹き出す室外ファンと、が筐体の内部に設けられたトップフロー型の室外機がある（例えば、特許文献１参照）。 Conventionally, a plurality of flat tubes arranged at intervals in the horizontal direction with the vertical direction as the tube stretching direction, a plurality of fins connected between adjacent flat tubes to transfer heat to the flat tubes, and a plurality of flat tubes arranged at intervals in the horizontal direction. There is a top-flow type outdoor unit in which an outdoor heat exchanger having headers provided at the upper and lower ends of the tubes, and an outdoor fan that blows air upwards are provided inside the casing (for example, , see Patent Document 1).
　このトップフロー型の室外機は、筐体の周方向に室外熱交換器が配置され、室外熱交換器の上方かつ筐体の上部に室外ファンが配置されている。 In this top flow type outdoor unit, an outdoor heat exchanger is arranged in the circumferential direction of the casing, and an outdoor fan is arranged above the outdoor heat exchanger and at the top of the casing.
特許第６５９５１２５号公報Patent No. 6595125
　しかしながら、特許文献１は、筐体の周方向の風速分布に違いが生じるため、各熱交換器を通過する風速に違いが生じ、それによって熱負荷分布が偏る。これにより、風速の大きい室外熱交換器では熱交換量が大きく、冷媒と空気との温度差が小さく室外熱交換器として寄与率の小さい領域である過冷却液の領域が大きくなる。それに対して、風速が小さい室外熱交換器では熱交換量が小さく、過冷却液の領域が小さくなる。そして、これら各室外熱交換器での熱交換量のばらつきによって所望の熱交換量を満足しようとする場合、圧力上昇させる必要のない風速が大きい室外熱交換器まで無駄に昇圧させることになるので、その分、エネルギーロスが大きくなる。その結果、室外熱交換器全体での熱交換器性能が低下するという課題があった。 However, in Patent Document 1, since a difference occurs in the wind speed distribution in the circumferential direction of the casing, a difference occurs in the wind speed passing through each heat exchanger, which causes a biased heat load distribution. As a result, in an outdoor heat exchanger with a high wind speed, the heat exchange amount is large, and the temperature difference between the refrigerant and the air is small, and the region of the supercooled liquid, which is a region with a small contribution rate as an outdoor heat exchanger, becomes large. On the other hand, in an outdoor heat exchanger where the wind speed is low, the amount of heat exchanged is small, and the area of the supercooled liquid is small. If you try to satisfy the desired amount of heat exchange by varying the amount of heat exchanged between these outdoor heat exchangers, you will end up needlessly increasing the pressure in outdoor heat exchangers with high wind speeds that do not need to be increased in pressure. , the energy loss increases accordingly. As a result, there was a problem in that the heat exchanger performance of the entire outdoor heat exchanger deteriorated.
　本開示は、以上のような課題を解決するためになされたもので、風速分布の違いによる熱交換性能低下を抑制した室外機およびそれを備えた空気調和装置を提供することを目的としている。 The present disclosure has been made to solve the above-mentioned problems, and aims to provide an outdoor unit that suppresses deterioration in heat exchange performance due to differences in wind speed distribution, and an air conditioner equipped with the same.
　本開示に係る室外機は、上部中央に吹き出し口を有し、平面視して矩形状の筐体と、前記筐体の内部に設けられた３つの室外熱交換器と、前記３つの室外熱交換器の上方に配置され、前記吹き出し口から上向きに空気を吹き出す室外ファンと、を備え、前記３つの室外熱交換器のそれぞれは、上下方向を管延伸方向とし、互いに平行となるように扁平面を対向させた、内部を冷媒が流れる複数の扁平管で構成された扁平管群を備え、前記筐体は、四側面のうち三側面に空気が流通する流通面を有し、残りの一側面に空気が流通しない封止面を有し、前記３つの室外熱交換器は、前記流通面に沿ってそれぞれ設けられており、前記封止面を基準として前記室外ファンの回転方向の順に並んだ前記３つの室外熱交換器を、それぞれ一番目の室外熱交換器、二番目の室外熱交換器、三番目の室外熱交換器としたとき、冷房運転時において、前記一番目の室外熱交換器および前記三番目の室外熱交換器が冷媒流れの上流側、前記二番目の室外熱交換器が冷媒流れの下流側となるように前記３つの室外熱交換器がそれぞれ接続されているものである。 An outdoor unit according to the present disclosure includes a housing having an air outlet in the center of the upper part and having a rectangular shape in plan view, three outdoor heat exchangers provided inside the housing, and the three outdoor heat exchangers. an outdoor fan disposed above the exchanger and blowing air upward from the outlet; each of the three outdoor heat exchangers is flattened so as to be parallel to each other with the vertical direction being the pipe extending direction; The casing includes a flat tube group composed of a plurality of flat tubes whose surfaces face each other and through which refrigerant flows, and the housing has a flow surface through which air flows on three of the four sides, and the remaining one has a flow surface through which air flows. A side surface has a sealing surface through which air does not circulate, and the three outdoor heat exchangers are provided along the circulation surface, and are arranged in the order of the rotation direction of the outdoor fan with the sealing surface as a reference. When the three outdoor heat exchangers are the first outdoor heat exchanger, the second outdoor heat exchanger, and the third outdoor heat exchanger, during cooling operation, the first outdoor heat exchanger The three outdoor heat exchangers are connected such that the heat exchanger and the third outdoor heat exchanger are connected to the upstream side of the refrigerant flow, and the second outdoor heat exchanger is connected to the downstream side of the refrigerant flow. be.
　また、本開示に係る空気調和装置は、上記の室外機と、室内機と、を備えたものである。 Further, an air conditioner according to the present disclosure includes the above-mentioned outdoor unit and an indoor unit.
　本開示に係る室外機によれば、冷房運転時において、風速が最も大きい風が流れる一番目の室外熱交換器と風速が最も小さい風が流れる三番目の室外熱交換器とに対して冷媒が並行に流れ、風速が中間の風が流れる二番目の室外熱交換器で冷媒を合流させるようにする。そうすることで、一番目の室外熱交換器および三番目の室外熱交換器が上流側熱交換器として機能し、風速が中間の風が流れる二番目の室外熱交換器が下流側熱交換器として機能する。このようにすることで、風速が最も大きい風が流れる室外熱交換器と風速が最も小さい風が流れる室外熱交換器とでは、気液二相状態で冷媒が流動し、過冷却液の領域が発生しにくい。また、過冷却液の領域は、風速が中間の風が流れる室外熱交換器で処理される。その結果、風速分布の違いによる熱交換器性能の低下を抑制することができる。 According to the outdoor unit according to the present disclosure, during cooling operation, refrigerant is supplied 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. The refrigerants are combined at the second outdoor heat exchanger where air flows in parallel and has an intermediate wind speed. By doing so, the first outdoor heat exchanger and the third outdoor heat exchanger function as upstream heat exchangers, and the second outdoor heat exchanger, through which wind with an intermediate wind speed flows, functions as a downstream heat exchanger. functions as By doing this, the refrigerant flows in a gas-liquid two-phase state between the outdoor heat exchanger where the wind with the highest wind speed flows and the outdoor heat exchanger where the wind with the lowest wind speed flows, and the supercooled liquid area is Hard to occur. In addition, the supercooled liquid area is treated with an outdoor heat exchanger through which wind at an intermediate speed flows. As a result, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed.
実施の形態１に係る室外機を備えた空気調和装置の構成を示す図である。1 is a diagram showing the configuration of an air conditioner including an outdoor unit according to Embodiment 1. FIG. 実施の形態１に係る室外機の構成を説明する模式図である。1 is a schematic diagram illustrating the configuration of an outdoor unit according to Embodiment 1. FIG. 実施の形態１に係る室外熱交換器の構成を説明する斜視図である。1 is a perspective view illustrating the configuration of an outdoor heat exchanger according to Embodiment 1. FIG. 実施の形態１に係る室外機の冷房運転時の冷媒の流れを説明する平面模式図である。FIG. 3 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to the first embodiment. 実施の形態１に係る室外機の暖房運転時の冷媒の流れを説明する平面模式図である。FIG. 3 is a schematic plan view illustrating the flow of refrigerant during heating operation of the outdoor unit according to the first embodiment. 実施の形態１に係る室外機の暖房運転時における各室外熱交換器の温度分布を示す図である。FIG. 3 is a diagram showing the temperature distribution of each outdoor heat exchanger during heating operation of the outdoor unit according to the first embodiment. 実施の形態１に係る室外機の変形例の冷房運転時の冷媒の流れを説明する平面模式図である。FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the modified example of the outdoor unit according to the first embodiment. 実施の形態１に係る室外機の変形例の暖房運転時の冷媒の流れを説明する平面模式図である。FIG. 6 is a schematic plan view illustrating the flow of refrigerant during heating operation of the modified example of the outdoor unit according to the first embodiment. 実施の形態２に係る室外熱交換器の構成を説明する斜視図である。FIG. 2 is a perspective view illustrating the configuration of an outdoor heat exchanger according to a second embodiment. 実施の形態２に係る室外機の冷房運転時の冷媒の流れを説明する平面模式図である。FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to Embodiment 2. FIG. 実施の形態２に係る室外熱交換器の冷房運転時における各領域での空気と冷媒との温度差を示す図である。FIG. 7 is a diagram showing the temperature difference between air and refrigerant in each region during cooling operation of the outdoor heat exchanger according to Embodiment 2; 実施の形態３に係る室外熱交換器の構成を説明する斜視図である。FIG. 7 is a perspective view illustrating the configuration of an outdoor heat exchanger according to Embodiment 3. 実施の形態３に係る室外機の冷房運転時の冷媒の流れを説明する平面模式図である。FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to Embodiment 3; 実施の形態５に係る室外機の冷房運転時の冷媒の流れを説明する平面模式図である。FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit according to Embodiment 5. FIG.
　以下、本開示の実施の形態を図面に基づいて説明する。なお、以下に説明する実施の形態によって本開示が限定されるものではない。また、以下の図面では各構成部材の大きさの関係が実際のものとは異なる場合がある。 Hereinafter, embodiments of the present disclosure will be described based on the drawings. Note that the present disclosure is not limited to the embodiments described below. Further, in the following drawings, the size relationship of each component may differ from the actual one.
　実施の形態１．
＜空気調和装置の構成＞
　図１は、実施の形態１に係る室外機２００を備えた空気調和装置の構成を示す図である。図１に示すように、実施の形態１に係る空気調和装置は、室外機２００と室内機１００とを備え、それらが冷媒配管３００で接続されている。室外機２００は、圧縮機２１０、流路切替装置２２０、および室外熱交換器２３０を備えている。また、室内機１００は、室内熱交換器１１０および絞り装置１２０を備えている。そして、圧縮機２１０、流路切替装置２２０、室外熱交換器２３０、絞り装置１２０、および室内熱交換器１１０、が冷媒配管３００で順次接続され、冷媒が循環する冷媒回路１が構成されている。ここで、実施の形態１に係る空気調和装置は、１台の室外機２００と１台の室内機１００とが冷媒配管３００で接続されているが、室外機２００および室内機１００の接続台数は、これに限定されない。 Embodiment 1.
<Configuration of air conditioner>
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 path switching device 220, and an outdoor heat exchanger 230. In addition, the indoor unit 100 includes an indoor heat exchanger 110 and a throttle device 120. The compressor 210, the flow path switching device 220, the outdoor heat exchanger 230, the expansion device 120, and the indoor heat exchanger 110 are sequentially connected through a refrigerant pipe 300, forming a refrigerant circuit 1 in which refrigerant circulates. . Here, in the air conditioner according to the first embodiment, one outdoor unit 200 and one indoor unit 100 are connected by a refrigerant pipe 300, but the number of connected outdoor units 200 and indoor units 100 is , but not limited to.
　室内機１００は、室内熱交換器１１０および絞り装置１２０の他に、室内ファン１３０を有する。絞り装置１２０は、冷媒を減圧して膨張させるものである。絞り装置１２０は、例えば絞りの開度を調整することができる電子式膨張弁であり、開度を調整することによって、冷房運転時では室内熱交換器１１０に流入する冷媒圧力を制御し、暖房運転時では室外熱交換器２３０に流入する冷媒圧力を制御する。室内熱交換器１１０は、空調対象空間である室内の空気と冷媒との熱交換を行う。たとえば、暖房運転時においては、室内熱交換器１１０は、凝縮器として機能し、冷媒を凝縮して液化させる。また、冷房運転時においては、室内熱交換器１１０は、蒸発器として機能し、冷媒を蒸発させ、気化させる。室内ファン１３０は、室内熱交換器１１０に室内の空気を通過させ、室内熱交換器１１０を通過させた空気を室内に供給する。 The indoor unit 100 includes an indoor fan 130 in addition to an indoor heat exchanger 110 and a throttle device 120. The expansion device 120 depressurizes and expands the refrigerant. The throttle device 120 is, for example, an electronic expansion valve that can adjust the opening degree of the throttle, and by adjusting the opening degree, it controls the refrigerant pressure flowing into the indoor heat exchanger 110 during cooling operation, and controls the refrigerant pressure flowing into the indoor heat exchanger 110 during heating operation. During operation, the pressure of the refrigerant flowing into the outdoor heat exchanger 230 is controlled. The indoor heat exchanger 110 exchanges heat between indoor air, which is a space to be air-conditioned, and a refrigerant. For example, during heating operation, the indoor heat exchanger 110 functions as a condenser to condense and liquefy the refrigerant. Further, during cooling operation, the indoor heat exchanger 110 functions as an evaporator to evaporate and vaporize the refrigerant. The indoor fan 130 causes indoor air to pass through the indoor heat exchanger 110, and supplies the air that has passed through the indoor heat exchanger 110 into the room.
＜室外機２００の構成＞
　図２は、実施の形態１に係る室外機２００の構成を説明する模式図である。実施の形態１に係る室外機２００は、筐体２０１の上部中央に室外ファン２５０の吹き出し口２０２を有し、吹き出し口２０２から上向きに空気を吹き出すトップフロー型である。図２では、説明のため、筐体２０１の上部に配置された室外熱交換器２３０の上側部分についてのみ示しているが、実施の形態１に係る室外機２００は、筐体２０１の底面に近い位置まで室外熱交換器２３０が配置されている。 <Configuration of outdoor unit 200>
FIG. 2 is a schematic diagram illustrating the configuration of outdoor unit 200 according to the first embodiment. The outdoor unit 200 according to the first embodiment is a top flow type having an outlet 202 of an outdoor fan 250 in the upper center of a housing 201, and blows air upward from the outlet 202. Although FIG. 2 only shows the upper part of the outdoor heat exchanger 230 disposed at the top of the housing 201 for explanation, the outdoor unit 200 according to the first embodiment is located close to the bottom of the housing 201. The outdoor heat exchanger 230 is arranged up to the position.
　室外機２００は、冷媒回路１を構成する機器として、圧縮機２１０、流路切替装置２２０、室外熱交換器２３０、およびアキュムレータ２４０を有する。圧縮機２１０は、低温低圧の冷媒を吸入し、吸入した冷媒を圧縮し、高温高圧の冷媒を吐出する。圧縮機２１０は、例えば、運転周波数を変化させることにより、単位時間あたりの送出量である容量が制御されるインバーター圧縮機などである。 The outdoor unit 200 includes a compressor 210, a flow path switching device 220, an outdoor heat exchanger 230, and an accumulator 240 as devices that constitute the refrigerant circuit 1. The compressor 210 sucks in low-temperature, low-pressure refrigerant, compresses the sucked refrigerant, and discharges high-temperature, high-pressure refrigerant. The compressor 210 is, for example, an inverter compressor whose capacity, which is the amount of output per unit time, is controlled by changing the operating frequency.
　流路切替装置２２０は、例えば四方弁であり、冷媒の流れの方向を切り替えることで、冷房運転と暖房運転とを切り替えるものである。なお、流路切替装置２２０として、四方弁に代えて二方弁および三方弁の組み合わせなどを用いてもよい。流路切替装置２２０は、暖房運転が行われる際、圧縮機２１０の吐出側と室内熱交換器１１０とを接続するとともに、圧縮機２１０の吸入側と室外熱交換器２３０と接続する。また、流路切替装置２２０は、冷房運転が行われる際、圧縮機２１０の吐出側と室外熱交換器２３０とを接続するとともに、圧縮機２１０の吸入側を室内熱交換器１１０と接続する。アキュムレータ２４０は、圧縮機２１０の吸入側に設置され、ガス状の冷媒（以下、ガス冷媒と称する）を通過させ、液状の冷媒（以下、液冷媒と称する）を溜める。 The flow path switching device 220 is, for example, a four-way valve, and switches between cooling operation and heating operation by switching the flow direction of the refrigerant. Note that as the flow path switching device 220, a combination of a two-way valve and a three-way valve may be used instead of the four-way valve. 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 heating operation is performed. In addition, 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 when cooling operation is performed. The accumulator 240 is installed on the suction side of the compressor 210, allows gaseous refrigerant (hereinafter referred to as gas refrigerant) to pass therethrough, and stores liquid refrigerant (hereinafter referred to as liquid refrigerant).
　室外熱交換器２３０は、冷媒と室外の空気との熱交換を行う。室外熱交換器２３０にとっては、冷媒は、熱交換媒体となる流体となる。ここで、室外熱交換器２３０は、暖房運転時においては蒸発器として機能し、冷媒を蒸発させ、気化させる。一方、室外熱交換器２３０は、冷房運転時においては、凝縮器および過冷却器として機能し、冷媒を凝縮して液化させ、過冷却を行う。また、室外ファン２５０は、室外熱交換器２３０の上方に配置され、駆動により、室外機２００外部からの空気を室外熱交換器２３０に通過させた後、吹き出し口２０２から上向きに空気を吹き出す。 The outdoor heat exchanger 230 exchanges heat between the refrigerant and 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, and evaporates and vaporizes the refrigerant. On the other hand, during cooling operation, the outdoor heat exchanger 230 functions as a condenser and a supercooler, condenses and liquefies the refrigerant, and performs supercooling. Furthermore, the outdoor fan 250 is disposed above the outdoor heat exchanger 230 and is driven to allow air from outside the outdoor unit 200 to pass through the outdoor heat exchanger 230, and then blows the air upward from the outlet 202.
＜空気調和装置の動作＞
　次に、空気調和装置の各機器の動作について、冷媒の流れに基づいて説明する。まず、暖房運転における冷媒回路１の各機器の動作を、冷媒の流れに基づいて説明する。図１の実線矢印は、暖房運転における冷媒の流れを示している。圧縮機２１０により圧縮されて吐出した高温高圧のガス冷媒は、流路切替装置２２０を通過し、室内熱交換器１１０に流入する。ガス冷媒は、室内熱交換器１１０を通過中に、たとえば、空調対象空間の空気と熱交換することで凝縮し、液化する。凝縮し、液化した冷媒は、絞り装置１２０を通過する。冷媒は、絞り装置１２０を通過する際、減圧される。絞り装置１２０で減圧されて気液二相状態となった冷媒は、室外熱交換器２３０を通過する。室外熱交換器２３０において、室外ファン２５０から送られた室外の空気と熱交換することで蒸発し、ガス化した冷媒は、流路切替装置２２０およびアキュムレータ２４０を通過して、再度、圧縮機２１０に吸入される。以上のようにして、空気調和装置の冷媒が循環し、暖房に係る空気調和を行う。 <Operation of air conditioner>
Next, the operation of each device of the air conditioner will be explained based on the flow of refrigerant. First, the operation of each device in the refrigerant circuit 1 during heating operation will be explained based on the flow of refrigerant. Solid line arrows in FIG. 1 indicate the flow of refrigerant during heating 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 indoor heat exchanger 110 . While passing through the indoor heat exchanger 110, the gas refrigerant condenses and liquefies, for example, by exchanging heat with the air in the air-conditioned space. The condensed and liquefied refrigerant passes through a throttling device 120 . When the refrigerant passes through the expansion device 120, the pressure is reduced. The refrigerant, which has been depressurized by the expansion device 120 and becomes a gas-liquid two-phase state, passes through the outdoor heat exchanger 230. In the outdoor heat exchanger 230, the refrigerant that is evaporated and gasified by exchanging heat with the outdoor air sent from the outdoor fan 250 passes through the flow path switching device 220 and the accumulator 240, and is returned to the compressor 210. is inhaled. As described above, the refrigerant of the air conditioner circulates and air conditioning related to heating is performed.
　次に、冷房運転について説明する。図１の点線矢印は、冷房運転における冷媒の流れを示している。圧縮機２１０により圧縮されて吐出した高温高圧のガス冷媒は、流路切替装置２２０を通過し、室外熱交換器２３０に流入する。そして、室外熱交換器２３０内を通過して、室外ファン２５０が供給した室外の空気と熱交換することで凝縮し、液化した冷媒は、絞り装置１２０を通過する。冷媒は、絞り装置１２０を通過する際、減圧される。絞り装置１２０で減圧されて気液二相状態となった冷媒は、室内熱交換器１１０を通過する。そして、室内熱交換器１１０において、たとえば、空調対象空間の空気と熱交換することで蒸発し、ガス化した冷媒は、流路切替装置２２０およびアキュムレータ２４０を通過して、再度、圧縮機２１０に吸入される。以上のようにして、空気調和装置の冷媒が循環し、冷房に係る空気調和を行う。 Next, the cooling operation will be explained. Dotted arrows in FIG. 1 indicate the flow of refrigerant during 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 is condensed and liquefied by exchanging heat with the outdoor air supplied by the outdoor fan 250 , and then passes through the expansion device 120 . When the refrigerant passes through the expansion device 120, the pressure is reduced. The refrigerant, which has been depressurized by the expansion device 120 and becomes a gas-liquid two-phase state, passes through the indoor heat exchanger 110. Then, in the indoor heat exchanger 110, for example, the refrigerant that is evaporated and gasified by exchanging heat with the air in the air-conditioned space passes through the flow path switching device 220 and the accumulator 240, and is returned to the compressor 210. Inhaled. As described above, the refrigerant of the air conditioner circulates, and air conditioning related to cooling is performed.
＜室外熱交換器２３０の構成＞
　図３は、実施の形態１に係る室外熱交換器２３０の構成を説明する斜視図である。なお、図３の破線矢印は、冷房運転時の冷媒の流れを示している。また、図３の白矢印は、空気の流れを示している。図３に示すように、実施の形態１に係る室外熱交換器２３０は、２本の分配ヘッダ２３４による一対のヘッダが、高さ方向に上下に分かれて配置されている。 <Configuration of outdoor heat exchanger 230>
FIG. 3 is a perspective view illustrating the configuration of outdoor heat exchanger 230 according to the first embodiment. Note that the broken line arrows in FIG. 3 indicate the flow of refrigerant during cooling operation. Moreover, the white arrow in FIG. 3 indicates the flow of air. As shown in FIG. 3, in the outdoor heat exchanger 230 according to the first embodiment, a pair of headers including two distribution headers 234 are arranged vertically separated in the height direction.
　そして、２本の分配ヘッダ２３４の間には、上下方向を管延伸方向とし、互いに平行となるように扁平面を対向させた、内部を冷媒が流れる複数の扁平管２３２で構成された扁平管２３２の群（以下、扁平管群２３１と称する）が配置されている。扁平管２３２は、断面が扁平形状を有し、空気の流れ方向に沿った扁平形状の長手側における外側面が平面状であり、当該長手方向に直交する短手側における外側面が曲面状である伝熱管である。実施の形態１に係る扁平管２３２は、管の内部において、冷媒の流路となる複数の穴を有する多穴扁平管である。実施の形態１において、扁平管２３２の穴は、２本の分配ヘッダ２３４の間の流路となるため、高さ方向を向いて形成されている。隣り合う２つの扁平管２３２の間には、波形状を有し、複数の頂部が扁平管２３２の扁平面に接合されるフィン２３３が設けられている。 Between the two distribution headers 234, there is a flat tube composed of a plurality of flat tubes 232, in which the refrigerant flows, with the vertical direction being the tube extending direction and flat surfaces facing each other so as to be parallel to each other. 232 groups (hereinafter referred to as flat tube groups 231) are arranged. The flat tube 232 has a flat cross section, the outer surface on the longitudinal side of the flat shape along the air flow direction is flat, and the outer surface on the shorter side perpendicular to the longitudinal direction is curved. It is a certain heat exchanger tube. The flat tube 232 according to Embodiment 1 is a multi-hole flat tube that has a plurality of holes that serve as refrigerant flow paths inside the tube. In the first embodiment, the holes in the flat tube 232 serve as flow paths between the two distribution headers 234, so they are formed facing in the height direction. Between two adjacent flat tubes 232 , fins 233 are provided which have a wave shape and have a plurality of tops joined to the flat surfaces of the flat tubes 232 .
　扁平管群２３１の両端には、それぞれ分配ヘッダ２３４が設けられている。分配ヘッダ２３４には、扁平管群２３１の扁平管２３２の下端部あるいは上端部が挿入されている。 Distribution headers 234 are provided at both ends of the flat tube group 231, respectively. The lower ends or upper ends of the flat tubes 232 of the flat tube group 231 are inserted into the distribution header 234 .
　一方の分配ヘッダ２３４の一端にはホットガス冷媒入口（図示せず）が形成されている。実施の形態１では、図３に示すように、下側の分配ヘッダ２３４の一端にはホットガス冷媒入口が形成されている。そのホットガス冷媒入口は、ガス配管２３７を介して空気調和装置の冷媒回路１、例えば冷房運転時の圧縮機２１０の吐出側と接続されている。そのため、冷媒入口が形成された分配ヘッダ２３４は、ガスヘッダとも呼ばれる。この冷媒入口が形成された分配ヘッダ２３４は、冷房運転時に圧縮機２１０からの高温高圧のガス冷媒（以下、ホットガス冷媒とも称する）を室外熱交換器２３０に流入させ、暖房運転時に室外熱交換器２３０で熱交換された後の低温低圧のガス冷媒を冷媒回路１に流出させる。つまり、ホットガス冷媒入口は、ホットガス冷媒流入部となる。ここで、ホットガス冷媒は、ガス単相冷媒に限定されず、０℃以上のガス相が含まれる気液二相冷媒であってもよい。 A hot gas refrigerant inlet (not shown) is formed at one end of one distribution header 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 via a gas pipe 237 to the refrigerant circuit 1 of the air conditioner, for example, the discharge side of the compressor 210 during cooling operation. Therefore, the distribution header 234 in which the refrigerant inlet is formed is also called a gas header. The distribution header 234 in which this refrigerant inlet is formed allows the 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 outdoor heat exchange during heating operation. The low-temperature, low-pressure gas refrigerant that has undergone heat exchange in the container 230 flows out into the refrigerant circuit 1. In other words, the hot gas refrigerant inlet becomes a hot gas refrigerant inlet. Here, the hot gas refrigerant is not limited to a gas single-phase refrigerant, but may be a gas-liquid two-phase refrigerant containing a gas phase of 0° C. or higher.
　もう一方の分配ヘッダ２３４の一端には液冷媒出口（図示せず）が形成されている。実施の形態１では、図３に示すように、上側の分配ヘッダ２３４の一端には液冷媒出口が形成されている。その液冷媒出口は、液配管２３６を介して空気調和装置の冷媒回路１と接続されている。そのため、液冷媒出口が形成された分配ヘッダ２３４は、液ヘッダとも呼ばれる。この液冷媒出口が形成された分配ヘッダ２３４は、暖房運転時に低温低圧の二相冷媒を室外熱交換器２３０に流入させ、冷房運転時に室外熱交換器２３０で熱交換された後の低温高圧の液冷媒を流出させる。つまり、液冷媒出口は、液冷媒流出部となる。 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 a liquid pipe 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 allows the low-temperature, low-pressure two-phase refrigerant to flow into the outdoor heat exchanger 230 during heating operation, and allows the low-temperature, high-pressure two-phase refrigerant after heat exchange in the outdoor heat exchanger 230 during cooling operation to flow into the outdoor heat exchanger 230. Drain liquid refrigerant. In other words, the liquid refrigerant outlet becomes a liquid refrigerant outlet.
　複数の扁平管２３２、複数のフィン２３３、および分配ヘッダ２３４は、いずれもアルミニウム製であり、ロウ付けによって接合されている。 The plurality of flat tubes 232, the plurality of fins 233, and the distribution header 234 are all made of aluminum and are joined by brazing.
　図４は、実施の形態１に係る室外機２００の冷房運転時の冷媒の流れを説明する平面模式図である。図５は、実施の形態１に係る室外機２００の暖房運転時の冷媒の流れを説明する平面模式図である。図６は、実施の形態１に係る室外機２００の暖房運転時における各室外熱交換器２３０の温度分布を示す図である。 FIG. 4 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the outdoor unit 200 according to the first embodiment. FIG. 5 is a schematic plan view illustrating the flow of refrigerant during heating operation of outdoor unit 200 according to the first embodiment. FIG. 6 is a diagram showing the temperature distribution of each outdoor heat exchanger 230 during heating operation of the outdoor unit 200 according to the first embodiment.
　図４および図５に示すように、筐体２０１は、平面視して矩形状であり、四側面のうち三側面に空気が流通する流通面２６１を有し、残りの一側面に空気が流通しない封止面２６０を有している。また、各流通面２６１に沿って、室外熱交換器２３０（２３０ａ～２３０ｃ）がそれぞれ配置されている。つまり、筐体２０１の内部には、３つの室外熱交換器２３０が設けられている。 As shown in FIGS. 4 and 5, the casing 201 has a rectangular shape in plan view, and has circulation surfaces 261 through which air flows on three of the four sides, and air flows through the remaining one side. It has a sealing surface 260 that is not Furthermore, outdoor heat exchangers 230 (230a to 230c) are arranged along each circulation surface 261, respectively. That is, three outdoor heat exchangers 230 are provided inside the housing 201.
　図４に示すように、冷房運転時では、斜線矢印で示すように室外機２００の内部を冷媒が流れる。封止面２６０を基準として室外ファン２５０の回転方向（破線黒矢印）の順に並んだ室外熱交換器２３０を、それぞれ一番目の室外熱交換器２３０ａ、二番目の室外熱交換器２３０ｂ、三番目の室外熱交換器２３０ｃとしたとき、一番目の室外熱交換器２３０ａおよび三番目の室外熱交換器２３０ｃが冷媒流れの上流側、二番目の室外熱交換器２３０ｂが冷媒流れの下流側となるように室外熱交換器２３０がそれぞれ冷媒配管２０３で接続されている。 As shown in FIG. 4, during cooling operation, refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow. The outdoor heat exchangers 230 arranged in the order of rotation direction (broken line black arrow) of the outdoor fan 250 with the sealing surface 260 as a reference are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230a, respectively. When the outdoor heat exchanger 230c is assumed as The outdoor heat exchangers 230 are connected by refrigerant pipes 203, respectively.
　また、図５に示すように、暖房運転時では、斜線矢印で示すように室外機２００の内部を冷媒が流れる。そして、一番目の室外熱交換器２３０ａおよび三番目の室外熱交換器２３０ｃが冷媒流れの下流側、二番目の室外熱交換器２３０ｂが冷媒流れの上流側となるように室外熱交換器２３０がそれぞれ冷媒配管２０３で接続されている。 Furthermore, as shown in FIG. 5, during heating operation, the refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow. The outdoor heat exchangers 230 are arranged so that the first outdoor heat exchanger 230a and the third outdoor heat exchanger 230c are on the downstream side of the refrigerant flow, and the second outdoor heat exchanger 230b is on the upstream side of the refrigerant flow. They are connected by refrigerant pipes 203, respectively.
　ここで、従来、室外熱交換器に着霜が生じる低温条件下においては、風速分布の違いによって熱交換器性能が異なり、熱交換器性能の低い室外熱交換器で偏着霜が発生し、暖房能力の低下を引き起こすという課題があった。しかし、実施の形態１では、図５および図６に示すように、暖房運転時においては、風速が最も大きい風が流れる一番目の室外熱交換器２３０ａを、空気温度と冷媒温度との差が大きく熱交換量の大きい、つまり熱交換器性能の高いメイン熱交換器として機能させることができる。そのため、風速が最も大きい風が流れる一番目の室外熱交換器２３０ａの偏着霜の発生が抑制されるので、低温条件下での暖房能力の低下を抑制することができる。 Conventionally, under low-temperature conditions where frost formation occurs on outdoor heat exchangers, heat exchanger performance differs due to differences in wind speed distribution, and uneven frost formation occurs on outdoor heat exchangers with low heat exchanger performance. There was a problem in that it caused 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 is It can function as a main heat exchanger with a large amount of heat exchange, that is, with high heat exchanger performance. Therefore, the occurrence of uneven frost formation on the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows is suppressed, so that it is possible to suppress a decrease in the heating capacity under low temperature conditions.
　図７は、実施の形態１に係る室外機２００の変形例の冷房運転時の冷媒の流れを説明する平面模式図である。図８は、実施の形態１に係る室外機２００の変形例の暖房運転時の冷媒の流れを説明する平面模式図である。 FIG. 7 is a schematic plan view illustrating the flow of refrigerant during cooling operation of the modified example of the outdoor unit 200 according to the first embodiment. FIG. 8 is a schematic plan view illustrating the flow of refrigerant during heating operation of the modified example of the outdoor unit 200 according to the first embodiment.
　なお、実施の形態１では、筐体２０１の上部中央に室外ファン２５０が１つ設けられているが、それに限定されず、全て同じ方向に回転するのであれば、図７および図８に示すように筐体２０１の上部中央に室外ファン２５０が２つ以上設けられていてもよい。図７および図８に示す実施の形態１の変形例においても、３つの室外熱交換器２３０の配置は、図４および図５に示す実施の形態１と同じである。 In the first embodiment, one outdoor fan 250 is provided at the center of the upper part of the housing 201, but the present invention is not limited to this, and if all the fans rotate in the same direction, as shown in FIGS. 7 and 8, Two or more outdoor fans 250 may be provided in the upper center of the housing 201. Also in the modification of the first embodiment shown in FIGS. 7 and 8, the arrangement of the three outdoor heat exchangers 230 is the same as in the first embodiment shown in FIGS. 4 and 5.
（実施の形態１の効果）
　筐体２０１の一側面に空気が流通しない封止面２６０を有する室外機２００においては、筐体２０１の各流通面２６１で風速分布に違いが発生する（白矢印）。特に、一番目の室外熱交換器２３０ａを流れる風が最も速く（風速大）、三番目の室外熱交換器２３０ｃを流れる風が最も遅く（風速小）、二番目の室外熱交換器２３０ｂを流れる風がそれらの中間の速さ（風速中）となる。実施の形態１では、冷房運転時において、風速が最も大きい風が流れる一番目の室外熱交換器２３０ａと風速が最も小さい風が流れる三番目の室外熱交換器２３０ｃとに対して冷媒が並行に流れ、風速が中間の風が流れる二番目の室外熱交換器２３０ｃで冷媒を合流させるようにする。そうすることで、一番目の室外熱交換器２３０ａおよび三番目の室外熱交換器２３０ｃが上流側熱交換器として機能し、風速が中間の風が流れる二番目の室外熱交換器２３０ｃが下流側熱交換器として機能する。このようにすることで、風速が最も大きい風が流れる室外熱交換器２３０と風速が最も小さい風が流れる室外熱交換器２３０とでは、気液二相状態で冷媒が流動し、過冷却液の領域が発生しにくい。また、過冷却液の領域は、風速が中間の風が流れる室外熱交換器２３０で処理される。その結果、風速分布の違いによる熱交換器性能の低下を抑制することができる。また、図５および図６に示すように、暖房運転時においては、風速が最も大きい風が流れる一番目の室外熱交換器２３０ａを、空気温度と冷媒温度との差が大きく熱交換量の大きい、つまり熱交換器性能の高いメイン熱交換器として機能させることができる。そのため、風速が最も大きい風が流れる一番目の室外熱交換器２３０ａの偏着霜の発生が抑制されるので、低温条件下での暖房能力の低下を抑制することができる。 (Effects of Embodiment 1)
In the outdoor unit 200 that has a sealing surface 260 on one side of the casing 201 through which air does not flow, a difference occurs in the wind speed distribution on each circulation surface 261 of the casing 201 (white arrow). In particular, the wind that flows through the first outdoor heat exchanger 230a is the fastest (high wind speed), the wind that flows through the third outdoor heat exchanger 230c is the slowest (low wind speed), and the wind that flows through the second outdoor heat exchanger 230b. The wind has a speed intermediate between these speeds (medium wind speed). In the first embodiment, during cooling operation, the refrigerant is applied 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. The refrigerants are made to merge at the second outdoor heat exchanger 230c where wind with an intermediate wind speed flows. By doing so, 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 wind with an intermediate wind speed flows, acts as a downstream heat exchanger. Functions as a heat exchanger. By doing this, the refrigerant flows in a gas-liquid two-phase state in the outdoor heat exchanger 230 where the wind with the highest wind speed flows and the outdoor heat exchanger 230 where the wind with the lowest wind speed flows, and the refrigerant flows in a gas-liquid two-phase state. Areas are less likely to occur. Further, the region of the supercooled liquid is treated with an outdoor heat exchanger 230 through which wind having an intermediate speed flows. As a result, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed. In addition, 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 is selected because the difference between the air temperature and the refrigerant temperature is large and the amount of heat exchange is large. In other words, it can function as a main heat exchanger with high heat exchanger performance. Therefore, the occurrence of uneven frost formation on the first outdoor heat exchanger 230a through which the wind with the highest wind speed flows is suppressed, so that it is possible to suppress a decrease in the heating capacity under low temperature conditions.
　以上、実施の形態１に係る室外機２００は、上部中央に吹き出し口２０２を有し、平面視して矩形状の筐体２０１と、筐体２０１の内部に設けられた３つの室外熱交換器２３０と、３つの室外熱交換器２３０の上方に配置され、吹き出し口２０２から上向きに空気を吹き出す室外ファン２５０と、を備えている。また、３つの室外熱交換器２３０のそれぞれは、上下方向を管延伸方向とし、互いに平行となるように扁平面を対向させた、内部を冷媒が流れる複数の扁平管２３２で構成された扁平管群２３１と、隣り合う２つの扁平管２３２の間に配置され、扁平管２３２の扁平面に接合される複数のフィン２３３と、を備えている。また、筐体２０１は、四側面のうち三側面に空気が流通する流通面２６１を有し、残りの一側面に空気が流通しない封止面２６０を有している。そして、３つの室外熱交換器２３０は、流通面２６１に沿ってそれぞれ設けられており、封止面２６０を基準として室外ファン２５０の回転方向の順に並んだ３つの室外熱交換器２３０を、それぞれ一番目の室外熱交換器２３０ａ、二番目の室外熱交換器２３０ｂ、三番目の室外熱交換器２３０ｃとしたとき、冷房運転時において、一番目の室外熱交換器２３０ａおよび三番目の室外熱交換器２３０ｃが冷媒流れの上流側、二番目の室外熱交換器２３０ｂが冷媒流れの下流側となるように３つの室外熱交換器２３０がそれぞれ接続されているものである。 As described above, the outdoor unit 200 according to the first embodiment includes a casing 201 that has an air outlet 202 at the center of the top and is rectangular in plan view, and three outdoor heat exchangers provided inside the casing 201. 230, and an outdoor fan 250 that is arranged above the three outdoor heat exchangers 230 and blows air upward from the air outlet 202. Moreover, each of the three outdoor heat exchangers 230 is a flat tube composed of a plurality of flat tubes 232 in which the refrigerant flows, with the vertical direction being the tube extending direction and flat surfaces facing each other so as to be parallel to each other. A plurality of fins 233 are arranged between two adjacent flat tubes 232 and joined to the flat surface of the flat tubes 232. Further, the housing 201 has a circulation surface 261 through which air flows on three of the four sides, and a sealing surface 260 through which air does not flow on the remaining one side. The three outdoor heat exchangers 230 are each provided along the flow surface 261, and the three outdoor heat exchangers 230 are arranged in the order of the rotational direction of the outdoor fan 250 with the sealing surface 260 as a reference. When the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230c are used, during cooling operation, the first outdoor heat exchanger 230a and the third outdoor heat exchanger The three outdoor heat exchangers 230 are connected such that the heat exchanger 230c is on the upstream side of the refrigerant flow, and the second outdoor heat exchanger 230b is on the downstream side of the refrigerant flow.
　実施の形態１に係る室外機２００によれば、冷房運転時において、風速が最も大きい風が流れる一番目の室外熱交換器２３０ａと風速が最も小さい風が流れる三番目の室外熱交換器２３０ｃとに対して冷媒が並行に流れ、風速が中間の風が流れる二番目の室外熱交換器２３０ｂで冷媒を合流させるようにする。そうすることで、一番目の室外熱交換器２３０ａおよび三番目の室外熱交換器２３０ｃが上流側熱交換器として機能し、風速が中間の風が流れる二番目の室外熱交換器２３０ｂが下流側熱交換器として機能する。このようにすることで、風速が最も大きい風が流れる室外熱交換器２３０と風速が最も小さい風が流れる室外熱交換器２３０とでは、気液二相状態で冷媒が流動し、過冷却液の領域が発生しにくい。また、過冷却液の領域は、風速が中間の風が流れる室外熱交換器２３０で処理される。その結果、風速分布の違いによる熱交換器性能の低下を抑制することができる。 According to the outdoor unit 200 according to the first embodiment, during cooling operation, 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. The refrigerants flow in parallel to each other, and the refrigerants are combined at the second outdoor heat exchanger 230b, where wind with an intermediate wind speed flows. By doing so, 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 wind with an intermediate wind speed flows, acts as a downstream heat exchanger. Functions as a heat exchanger. By doing this, the refrigerant flows in a gas-liquid two-phase state in the outdoor heat exchanger 230 where the wind with the highest wind speed flows and the outdoor heat exchanger 230 where the wind with the lowest wind speed flows, and the refrigerant flows in a gas-liquid two-phase state. Areas are less likely to occur. Further, the region of the supercooled liquid is treated with an outdoor heat exchanger 230 through which wind having an intermediate speed flows. As a result, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed.
　実施の形態２．
　以下、実施の形態２について説明するが、実施の形態１と重複するものについては説明を省略し、実施の形態１と同じ部分または相当する部分には同じ符号を付す。 Embodiment 2.
Embodiment 2 will be described below, but the description of parts that overlap with Embodiment 1 will be omitted, and the same or corresponding parts as in Embodiment 1 will be given the same reference numerals.
　図９は、実施の形態２に係る室外熱交換器２３０の構成を説明する斜視図である。なお、図９の破線矢印は、冷房運転時の冷媒の流れを示している。また、図９の白矢印は、空気の流れを示している。図９に示すように、実施の形態２に係る室外熱交換器２３０は、２本の分配ヘッダ２３４と列渡しヘッダ２３８とによる一対のヘッダが、高さ方向に上下に分かれて配置されている。 FIG. 9 is a perspective view illustrating the configuration of an outdoor heat exchanger 230 according to the second embodiment. Note that the broken line arrows in FIG. 9 indicate the flow of refrigerant during cooling operation. Moreover, the white arrow in FIG. 9 indicates the flow of air. As shown in FIG. 9, in the outdoor heat exchanger 230 according to the second embodiment, a pair of headers including two distribution headers 234 and a row transfer header 238 are arranged vertically and vertically. .
　そして、２本の分配ヘッダ２３４と列渡しヘッダ２３８の間には、上下方向を管延伸方向とし、互いに平行となるように扁平面を対向させた、内部を冷媒が流れる複数の扁平管２３２で構成された扁平管群２３１が配置されている。扁平管群２３１は、空気の流れ方向に２列に並んで配置されている。扁平管２３２は、断面が扁平形状を有し、空気の流れ方向に沿った扁平形状の長手側における外側面が平面状であり、当該長手方向に直交する短手側における外側面が曲面状である伝熱管である。実施の形態２に係る扁平管２３２は、管の内部において、冷媒の流路となる複数の穴を有する多穴扁平管である。実施の形態２において、扁平管２３２の穴は、分配ヘッダ２３４と列渡しヘッダ２３８との間の流路となるため、高さ方向を向いて形成されている。隣り合う２つの扁平管２３２の間には、波形状を有し、複数の頂部が扁平管２３２の扁平面に接合されるフィン２３３が設けられている。 Between the two distribution headers 234 and the row transfer header 238, there are a plurality of flat tubes 232 in which the refrigerant flows, with the vertical direction being the tube extending direction and flat surfaces facing each other so as to be parallel to each other. A configured flat tube group 231 is arranged. The flat tube group 231 is arranged in two rows in the air flow direction. The flat tube 232 has a flat cross section, the outer surface on the longitudinal side of the flat shape along the air flow direction is flat, and the outer surface on the shorter side perpendicular to the longitudinal direction is curved. It is a certain heat exchanger tube. The flat tube 232 according to the second embodiment is a multi-hole flat tube that has a plurality of holes that serve as refrigerant flow paths inside the tube. In the second embodiment, the holes in the flat tube 232 are formed to face in the height direction because they serve as flow paths between the distribution header 234 and the row-crossing header 238. Between two adjacent flat tubes 232 , fins 233 are provided which have a wave shape and have a plurality of tops joined to the flat surfaces of the flat tubes 232 .
　２つ扁平管群２３１の一端には、それぞれ分配ヘッダ２３４が設けられている。この２つの分配ヘッダ２３４は、高さ方向において同方向に配置されている。分配ヘッダ２３４には、扁平管群２３１の扁平管２３２の下端部あるいは上端部が挿入されている。実施の形態２では、図９に示すように、分配ヘッダ２３４には、扁平管群２３１の扁平管２３２の下端部が挿入されている。また、２つの扁平管群２３１の他端には、列渡しヘッダ２３８が設けられている。列渡しヘッダ２３８には、２つの扁平管群２３１の扁平管２３２の上端部あるいは下端部が挿入されている。実施の形態２では、図９に示すように、列渡しヘッダ２３８には、２つの扁平管群２３１の扁平管２３２の上端部が挿入されている。そして、列渡しヘッダ２３８は、この一方の扁平管群２３１の扁平管２３２から合流した冷媒を、もう一方の扁平管群２３１の扁平管２３２に分配する。 A distribution header 234 is provided at one end of each of the two flat tube groups 231. These two distribution headers 234 are arranged in the same direction in the height direction. The lower ends or upper ends of the flat tubes 232 of the flat tube group 231 are inserted into the distribution header 234 . In the second embodiment, as shown in FIG. 9, the lower ends of the flat tubes 232 of the flat tube group 231 are inserted into the distribution header 234. Furthermore, a row transfer header 238 is provided at the other end of the two flat tube groups 231. The upper end portions or lower end portions of the flat tubes 232 of the two flat tube groups 231 are inserted into the row transfer header 238 . In the second embodiment, as shown in FIG. 9, the upper ends of the flat tubes 232 of the two flat tube groups 231 are inserted into the row transfer header 238. Then, the row transfer header 238 distributes the refrigerant that has merged from the flat tubes 232 of one flat tube group 231 to the flat tubes 232 of the other flat tube group 231.
　空気の流れ方向の下流側（以下、風下側と称する）の分配ヘッダ２３４の一端にはホットガス冷媒入口（図示せず）が形成されている。そのホットガス冷媒入口は、ガス配管２３７を介して空気調和装置の冷媒回路１と接続されている。そのため、ホットガス冷媒入口が形成された風下側の分配ヘッダ２３４は、ガスヘッダとも呼ばれる。この風下側の分配ヘッダ２３４は、冷房運転時に圧縮機２１０からの高温高圧のガス冷媒を室外熱交換器２３０に流入させ、暖房運転時に室外熱交換器２３０で熱交換された後の低温低圧のガス冷媒を冷媒回路１に流出させる。つまり、ホットガス冷媒入口は、ホットガス冷媒流入部となる。ここで、ホットガス冷媒は、ガス単相冷媒に限定されず、０℃以上のガス相が含まれる気液二相冷媒であってもよい。 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 leeward side). The hot gas refrigerant inlet is connected to the refrigerant circuit 1 of the air conditioner via a gas pipe 237. Therefore, the leeward distribution header 234 in which the hot gas refrigerant inlet is formed is also called a gas header. This leeward side distribution header 234 allows high-temperature, high-pressure 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 to flow into the outdoor heat exchanger 230 during heating operation. The gas refrigerant is allowed to flow into the refrigerant circuit 1. In other words, the hot gas refrigerant inlet becomes a hot gas refrigerant inlet. Here, the hot gas refrigerant is not limited to a gas single-phase refrigerant, but may be a gas-liquid two-phase refrigerant containing a gas phase of 0° C. or higher.
　空気の流れ方向の上流側（以下、風上側と称する）の分配ヘッダ２３４の一端には液冷媒出口（図示せず）が形成されている。その液冷媒出口は、液配管２３６を介して空気調和装置の冷媒回路１と接続されている。そのため、液冷媒出口が形成された風上側の分配ヘッダ２３４は、液ヘッダとも呼ばれる。この風上側の分配ヘッダ２３４は、暖房運転時に低温低圧の二相冷媒を室外熱交換器２３０に流入させ、冷房運転時に室外熱交換器２３０で熱交換された後の低温高圧の液冷媒を流出させる。つまり、液冷媒出口は、液冷媒流出部となる。 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 a liquid pipe 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 allows low-temperature, low-pressure two-phase refrigerant to flow 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. let In other words, the liquid refrigerant outlet becomes a liquid refrigerant outlet.
　複数の扁平管２３２、複数のフィン２３３、分配ヘッダ２３４、および列渡しヘッダ２３８は、いずれもアルミニウム製であり、ロウ付けによって接合されている。 The plurality of flat tubes 232, the plurality of fins 233, the distribution header 234, and the row transfer header 238 are all made of aluminum and are joined by brazing.
　図１０は、実施の形態２に係る室外機２００の冷房運転時の冷媒の流れを説明する平面模式図である。図１０に示すように、筐体２０１は、平面視して矩形状であり、四側面のうち三側面に空気が流通する流通面２６１を有し、残りの一側面に空気が流通しない封止面２６０を有している。各流通面２６１には、室外熱交換器２３０（２３０ａ～２３０ｃ）がそれぞれ配置されている。つまり、筐体２０１には、３つの室外熱交換器２３０が設けられている。 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 casing 201 has a rectangular shape in plan view, and has a flow surface 261 through which air flows on three of the four sides, and a seal that prevents air flow on the remaining one side. It has a surface 260. Outdoor heat exchangers 230 (230a to 230c) are arranged on each circulation surface 261, respectively. That is, the housing 201 is provided with three outdoor heat exchangers 230.
　図１０に示すように、冷房運転時では、斜線矢印で示すように室外機２００の内部を冷媒が流れる。封止面２６０を基準として室外ファン２５０の回転方向（破線黒矢印）の順に並んだ室外熱交換器２３０を、それぞれ一番目の室外熱交換器２３０ａ、二番目の室外熱交換器２３０ｂ、三番目の室外熱交換器２３０ｃとしたとき、一番目の室外熱交換器２３０ａおよび三番目の室外熱交換器２３０ｃが冷媒流れの上流側、二番目の室外熱交換器２３０ｂが冷媒流れの下流側となるように室外熱交換器２３０がそれぞれ冷媒配管２０３で接続されている。そして、各室外熱交換器２３０は、冷房運転時に、ガス冷媒（実線黒矢印）が空気の流れ（白矢印）に対して対向流となるように配置されている。 As shown in FIG. 10, during cooling operation, refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow. The outdoor heat exchangers 230 arranged in the order of rotation direction (broken line black arrow) of the outdoor fan 250 with the sealing surface 260 as a reference are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230a, respectively. When the outdoor heat exchanger 230c is assumed as The outdoor heat exchangers 230 are connected by refrigerant pipes 203, respectively. Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows counter to the air flow (white arrow) during cooling operation.
（実施の形態２の効果）
　図１１は、実施の形態２に係る室外熱交換器２３０の冷房運転時における各領域での空気と冷媒との温度差を示す図である。実施の形態２では、室外熱交換器２３０を上記の構成とすることで、冷房運転時にガス冷媒（実線黒矢印）が空気の流れ（白矢印）に対して対向流とすることができる。そのため、図１１に示すように、空気と冷媒との温度差を室外熱交換器２３０の全体領域で大きく取れ、熱交換器性能を向上させることができる。また、液冷媒出口となる液配管２３６を封止面２６０側に設ける必要がなくなるため、室外熱交換器２３０の扁平管２３２の積幅を増やすことができ、熱交換器性能を向上させることができる。 (Effects of Embodiment 2)
FIG. 11 is a diagram showing the temperature difference between air and 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 counter 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, and the heat exchanger performance can be improved. Furthermore, since it is not necessary to provide the liquid piping 236 that serves as a liquid refrigerant outlet on the sealing surface 260 side, the width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved. can.
　以上、実施の形態２に係る室外機２００において、３つの室外熱交換器２３０のそれぞれは、扁平管群２３１が空気の流れ方向に２列に並んで配置されており、高さ方向において同方向に配置され、各扁平管群２３１の一端が挿入された２つの分配ヘッダ２３４と、２つの扁平管群２３１の他端が挿入された列渡しヘッダ２３８と、を備えている。そして、冷房運転時においてガス冷媒が空気の流れに対して対向流となるように、風下側に配置された扁平管群２３１の一端が挿入された分配ヘッダ２３４に冷媒入口が設けられている。 As described above, in the outdoor unit 200 according to the second embodiment, each of the three outdoor heat exchangers 230 has flat tube groups 231 arranged in two rows in the air flow direction, and 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-crossing header 238 into which the other end of the two flat tube groups 231 is inserted. A refrigerant inlet is provided in the distribution header 234 into which one end of the flat tube group 231 disposed on the leeward side is inserted so that the gas refrigerant flows counter-currently to the air flow during cooling operation.
　実施の形態２に係る室外機２００によれば、冷房運転時にガス冷媒が空気の流れに対して対向流とすることができるため、空気と冷媒との温度差を室外熱交換器２３０の全体領域で大きく取れ、熱交換器性能を向上させることができる。また、液冷媒出口となる液配管２３６を封止面２６０側に設ける必要がなくなるため、室外熱交換器２３０の扁平管２３２の積幅を増やすことができ、熱交換器性能を向上させることができる。 According to the outdoor unit 200 according to the second embodiment, since the gas refrigerant can flow counter to the air flow during cooling operation, the temperature difference between the air and the refrigerant can be reduced to the entire area of the outdoor heat exchanger 230. It is possible to obtain a large amount of heat and improve heat exchanger performance. Furthermore, since it is not necessary to provide the liquid piping 236 that serves as a liquid refrigerant outlet on the sealing surface 260 side, the width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved. can.
　実施の形態３．
　以下、実施の形態３について説明するが、実施の形態１および２と重複するものについては説明を省略し、実施の形態１および２と同じ部分または相当する部分には同じ符号を付す。 Embodiment 3.
Embodiment 3 will be described below, but the description of parts that overlap with Embodiments 1 and 2 will be omitted, and the same or corresponding parts as in Embodiments 1 and 2 will be given the same reference numerals.
　図１２は、実施の形態３に係る室外熱交換器２３０の構成を説明する斜視図である。なお、図１２の破線矢印は、冷房運転時の冷媒の流れを示している。また、図１２の白矢印は、空気の流れを示している。図１２に示すように、実施の形態３に係る室外熱交換器２３０は、２本の分配ヘッダ２３４による一対のヘッダが、高さ方向に上下に分かれて配置されている。また、一対のヘッダは、空気の流れ方向に２列に並んで配置されている。 FIG. 12 is a perspective view illustrating the configuration of an outdoor heat exchanger 230 according to the third embodiment. Note that the broken line arrows in FIG. 12 indicate the flow of refrigerant during cooling operation. Moreover, the white arrow in FIG. 12 indicates the flow of air. As shown in FIG. 12, in the outdoor heat exchanger 230 according to the third embodiment, a pair of headers made up of two distribution headers 234 are arranged vertically separated in the height direction. Further, the pair of headers are arranged in two rows in the air flow direction.
　そして、２本の分配ヘッダ２３４の間には、上下方向を管延伸方向とし、互いに平行となるように扁平面を対向させた、内部を冷媒が流れる複数の扁平管２３２で構成された２３１が配置されている。つまり、扁平管群２３１は、空気の流れ方向に２列に並んで配置されている。扁平管２３２は、断面が扁平形状を有し、空気の流れ方向に沿った扁平形状の長手側における外側面が平面状であり、当該長手方向に直交する短手側における外側面が曲面状である伝熱管である。実施の形態１に係る扁平管２３２は、管の内部において、冷媒の流路となる複数の穴を有する多穴扁平管である。実施の形態３において、扁平管２３２の穴は、２本の分配ヘッダ２３４の間の流路となるため、高さ方向を向いて形成されている。隣り合う２つの扁平管２３２の間には、波形状を有し、複数の頂部が扁平管２３２の扁平面に接合されるフィン２３３が設けられている。 Between the two distribution headers 234 is a plurality of flat tubes 232, in which the refrigerant flows, with the vertical direction being the tube extending direction and flat surfaces facing each other so as to be parallel to each other. It is located. That is, the flat tube group 231 is arranged in two rows in the air flow direction. The flat tube 232 has a flat cross section, the outer surface on the longitudinal side of the flat shape along the air flow direction is flat, and the outer surface on the shorter side perpendicular to the longitudinal direction is curved. It is a certain heat exchanger tube. The flat tube 232 according to Embodiment 1 is a multi-hole flat tube that has a plurality of holes that serve as refrigerant flow paths inside the tube. In the third embodiment, the holes in the flat tube 232 serve as flow paths between the two distribution headers 234, so they are formed facing in the height direction. Between two adjacent flat tubes 232 , fins 233 are provided which have a wave shape and have a plurality of tops joined to the flat surfaces of the flat tubes 232 .
　扁平管群２３１の両端には、それぞれ分配ヘッダ２３４が設けられている。分配ヘッダ２３４には、扁平管群２３１の扁平管２３２の下端部あるいは上端部が挿入されている。 Distribution headers 234 are provided at both ends of the flat tube group 231, respectively. The lower ends or upper ends of the flat tubes 232 of the flat tube group 231 are inserted into the distribution header 234 .
　風下側の分配ヘッダ２３４のうち、一方の分配ヘッダ２３４の一端にはホットガス冷媒入口（図示せず）が形成されている。実施の形態３では、図１２に示すように、風下側の分配ヘッダ２３４のうち、下側の分配ヘッダ２３４の一端にはホットガス冷媒入口が形成されている。そのホットガス冷媒入口は、ガス配管２３７を介して空気調和装置の冷媒回路１と接続されている。そのため、冷媒入口が形成された風下側の一方の分配ヘッダ２３４は、ガスヘッダとも呼ばれる。この冷媒入口が形成された風下側の一方の分配ヘッダ２３４は、冷房運転時に圧縮機２１０からの高温高圧のガス冷媒を室外熱交換器２３０に流入させ、暖房運転時に室外熱交換器２３０で熱交換された後の低温低圧のガス冷媒を冷媒回路１に流出させる。つまり、ホットガス冷媒入口は、ホットガス冷媒流入部となる。ここで、ホットガス冷媒は、ガス単相冷媒に限定されず、０℃以上のガス相が含まれる気液二相冷媒であってもよい。 A hot gas refrigerant inlet (not shown) is formed at one end of one of the distribution headers 234 on the leeward side. 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 among the distribution headers 234 on the leeward side. The hot gas refrigerant inlet is connected to the refrigerant circuit 1 of the air conditioner via a gas pipe 237. Therefore, one distribution header 234 on the leeward side in which a refrigerant inlet is formed is also called a gas header. One of the distribution headers 234 on the leeward side in which this refrigerant inlet is formed allows the high-temperature, high-pressure gas refrigerant from the compressor 210 to flow into the outdoor heat exchanger 230 during cooling operation, and allows the outdoor heat exchanger 230 to heat the refrigerant during heating operation. The low-temperature, low-pressure gas refrigerant after being replaced is made to flow into the refrigerant circuit 1. In other words, the hot gas refrigerant inlet becomes a hot gas refrigerant inlet. Here, the hot gas refrigerant is not limited to a gas single-phase refrigerant, but may be a gas-liquid two-phase refrigerant containing a gas phase of 0° C. or higher.
　風下側のもう一方の分配ヘッダ２３４の一端は、風上側の分配ヘッダ２３４のうち、一方の分配ヘッダ２３４の一端と、列間接続配管２３９で接続されている。ここで、風下側のもう一方の分配ヘッダ２３４と風上側の一方の分配ヘッダ２３４とは、高さ方向において同方向に配置されている。実施の形態３では、図１２に示すように、風下側のもう一方の分配ヘッダ２３４と風上側の一方の分配ヘッダ２３４とは、どちらも上側に配置されている。そして、列間接続配管２３９は、風下側のもう一方の分配ヘッダ２３４の冷媒を風上側の一方の分配ヘッダ２３４に流す。 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 an inter-row connection pipe 239. Here, the other distribution header 234 on the leeward side and 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 one distribution header 234 on the windward side are both arranged on the upper side. Then, the inter-row connecting pipe 239 allows the refrigerant in the other distribution header 234 on the leeward side to flow to one distribution header 234 on the windward side.
　風上側のもう一方の分配ヘッダ２３４の一端には液冷媒出口（図示せず）が形成されている。実施の形態３では、図１２に示すように、風上側の分配ヘッダ２３４のうち、下側の分配ヘッダ２３４の一端には液冷媒出口が形成されている。その液冷媒出口は、液配管２３６を介して空気調和装置の冷媒回路１と接続されている。そのため、風上側のもう一方の分配ヘッダ２３４は、液ヘッダとも呼ばれる。風上側のもう一方の分配ヘッダ２３４は、暖房運転時に低温低圧の二相冷媒を室外熱交換器２３０に流入させ、冷房運転時に室外熱交換器２３０で熱交換された後の低温高圧の液冷媒を流出させる。つまり、液冷媒出口は、液冷媒流出部となる。ここで、風下側の一方の分配ヘッダ２３４と風上側のもう一方の分配ヘッダ２３４とは、高さ方向において同方向に配置されている。実施の形態３では、図１２に示すように、風下側の一方の分配ヘッダ２３４と風上側のもう一方の分配ヘッダ２３４とは、どちらも下側に配置されている。 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 pipe 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 allows the low-temperature, low-pressure two-phase refrigerant to flow into the outdoor heat exchanger 230 during heating operation, and the low-temperature, high-pressure liquid refrigerant after heat exchange in the outdoor heat exchanger 230 during cooling operation. to flow out. In other words, the liquid refrigerant outlet becomes a liquid refrigerant outlet. Here, one distribution header 234 on the leeward side and the other 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, one distribution header 234 on the leeward side and the other distribution header 234 on the windward side are both arranged on the lower side.
　複数の扁平管２３２、複数のフィン２３３、および分配ヘッダ２３４は、いずれもアルミニウム製であり、ロウ付けによって接合されている。 The plurality of flat tubes 232, the plurality of fins 233, and the distribution header 234 are all made of aluminum and are joined by brazing.
　図１３は、実施の形態３に係る室外機２００の冷房運転時の冷媒の流れを説明する平面模式図である。図１３に示すように、筐体２０１は、平面視して矩形状であり、四側面のうち三側面に空気が流通する流通面２６１を有し、残りの一側面に空気が流通しない封止面２６０を有している。各流通面２６１には、室外熱交換器２３０（２３０ａ～２３０ｃ）がそれぞれ配置されている。つまり、筐体２０１には、３つの室外熱交換器２３０が設けられている。 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 casing 201 has a rectangular shape in plan view, and has circulation surfaces 261 on three of the four sides through which air flows, and the remaining one side is sealed so that air does not flow therethrough. It has a surface 260. Outdoor heat exchangers 230 (230a to 230c) are arranged on each circulation surface 261, respectively. That is, the housing 201 is provided with three outdoor heat exchangers 230.
　図１３に示すように、冷房運転時では、斜線矢印で示すように室外機２００の内部を冷媒が流れる。封止面２６０を基準として室外ファン２５０の回転方向（破線黒矢印）の順に並んだ室外熱交換器２３０を、それぞれ一番目の室外熱交換器２３０ａ、二番目の室外熱交換器２３０ｂ、三番目の室外熱交換器２３０ｃとしたとき、一番目の室外熱交換器２３０ａおよび三番目の室外熱交換器２３０ｃが冷媒流れの上流側、二番目の室外熱交換器２３０ｂが冷媒流れの下流側となるように室外熱交換器２３０がそれぞれ冷媒配管２０３で接続されている。そして、各室外熱交換器２３０は、冷房運転時に、ガス冷媒（実線黒矢印）が空気の流れ（白矢印）に対して対向流となるように配置されている。 As shown in FIG. 13, during cooling operation, refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow. The outdoor heat exchangers 230 arranged in the order of rotation direction (broken line black arrow) of the outdoor fan 250 with the sealing surface 260 as a reference are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230a, respectively. When the outdoor heat exchanger 230c is assumed as The outdoor heat exchangers 230 are connected by refrigerant pipes 203, respectively. Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows counter to the air flow (white arrow) during cooling operation.
（実施の形態３の効果）
　実施の形態３では、室外熱交換器２３０を上記の構成とすることで、冷房運転時にガス冷媒（実線黒矢印）が空気の流れ（白矢印）に対して対向流とすることができる。そのため、図１１に示すように、空気と冷媒との温度差を室外熱交換器２３０の全体領域で大きく取れ、熱交換器性能を向上させることができる。また、液冷媒出口となる液配管２３６を封止面２６０側に設ける必要がなくなるため、室外熱交換器２３０の扁平管２３２の積幅を増やすことができ、熱交換器性能を向上させることができる。 (Effects of Embodiment 3)
In the third embodiment, by configuring the outdoor heat exchanger 230 as described above, the gas refrigerant (solid black arrow) can flow counter 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, and the heat exchanger performance can be improved. Furthermore, since it is not necessary to provide the liquid piping 236 that serves as a liquid refrigerant outlet on the sealing surface 260 side, the width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved. can.
　以上、実施の形態３に係る室外機２００において、３つの室外熱交換器２３０のそれぞれは、扁平管群２３１が空気の流れ方向に２列に並んで配置されており、各扁平管群２３１の両端が挿入された４つの分配ヘッダ２３４を備えている。そして、冷房運転時においてガス冷媒が空気の流れに対して対向流となるように、風下側に配置された扁平管群２３１の一端が挿入された分配ヘッダ２３４に冷媒入口が設けられており、風下側に配置された扁平管群２３１の他端が挿入された分配ヘッダ２３４と、該分配ヘッダ２３４と高さ方向において同方向に配置され、かつ、風上側に配置された扁平管群２３１の一端が挿入された分配ヘッダ２３４とは、列間接続配管２３９で接続されている。 As described above, in the outdoor unit 200 according to the third embodiment, in each of the three outdoor heat exchangers 230, the flat tube groups 231 are arranged in two rows in the air flow direction. It has four distribution headers 234 inserted at both ends. A refrigerant inlet is provided in the distribution header 234 into which one end of the flat tube group 231 disposed on the leeward side is inserted so that the gas refrigerant flows in a counterflow to the air flow during cooling operation. A distribution header 234 into which the other end of a flat tube group 231 placed on the leeward side is inserted, and a flat tube group 231 placed in the same height direction as the distribution header 234 and on the windward side. The distribution header 234 into which one end has been inserted is connected to the distribution header 234 through an inter-row connection pipe 239 .
　実施の形態３に係る室外機２００によれば、冷房運転時にガス冷媒が空気の流れに対して対向流とすることができるため、空気と冷媒との温度差を室外熱交換器２３０の全体領域で大きく取れ、熱交換器性能を向上させることができる。また、液冷媒出口となる液配管２３６を封止面２６０側に設ける必要がなくなるため、室外熱交換器２３０の扁平管２３２の積幅を増やすことができ、熱交換器性能を向上させることができる。 According to the outdoor unit 200 according to the third embodiment, since the gas refrigerant can flow counter to the air flow during cooling operation, the temperature difference between the air and the refrigerant can be reduced to the entire area of the outdoor heat exchanger 230. It is possible to obtain a large amount of heat and improve heat exchanger performance. Furthermore, since it is not necessary to provide the liquid pipe 236 that serves as a liquid refrigerant outlet on the sealing surface 260 side, the width of the flat tubes 232 of the outdoor heat exchanger 230 can be increased, and the heat exchanger performance can be improved. can.
　実施の形態４．
　以下、実施の形態４について説明するが、実施の形態１～３と重複するものについては説明を省略し、実施の形態１～３と同じ部分または相当する部分には同じ符号を付す。 Embodiment 4.
Embodiment 4 will be described below, but the description of parts that overlap with Embodiments 1 to 3 will be omitted, and the same or corresponding parts as in Embodiments 1 to 3 will be given the same reference numerals.
　実施の形態４では、風速が最も小さい風が流れる三番目の室外熱交換器２３０ｃのフィン２３３の表面積が、風速が最も大きい風が流れる一番目の室外熱交換器２３０ａのフィン２３３の表面積よりも小さくなるように構成されている。具体的には、三番目の室外熱交換器２３０ｃのフィンピッチまたは扁平管ピッチなどが、一番目の室外熱交換器２３０ａよりも大きくなるように構成されている。あるいは、三番目の室外熱交換器２３０ｃの各扁平管群２３１の列方向の幅が一番目の室外熱交換器２３０ａの各扁平管群２３１の列方向の幅よりも小さくなるように、または、三番目の室外熱交換器２３０ｃの列数が一番目の室外熱交換器２３０ａよりも少なくなるように構成されている。このようにすることで、三番目の室外熱交換器２３０ｃの方が一番目の室外熱交換器２３０ａよりも通風抵抗が小さくなり、風が通りやすくなる。 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 larger 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. It is designed to be small. 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 column direction of each flat tube group 231 of the third outdoor heat exchanger 230c is smaller than the width in the column 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 smaller than that of the first outdoor heat exchanger 230a. By doing so, the third outdoor heat exchanger 230c has a lower ventilation resistance than the first outdoor heat exchanger 230a, making it easier for air to pass through.
（実施の形態４の効果）
　各室外熱交換器２３０の通風抵抗を調整することで、各室外熱交換器２３０での熱交換器性能のばらつきを抑制することができるので、風速分布の違いによる熱交換器性能の低下を抑制することができる。 (Effects of Embodiment 4)
By adjusting the ventilation resistance of each outdoor heat exchanger 230, it is possible to suppress variations in heat exchanger performance among each outdoor heat exchanger 230, thereby suppressing deterioration in heat exchanger performance due to differences in wind speed distribution. can do.
　以上、実施の形態４に係る室外機２００は、三番目の室外熱交換器２３０ｃの通風抵抗は、一番目の室外熱交換器２３０ａの通風抵抗よりも小さくなるように構成されている。 As described above, the outdoor unit 200 according to the fourth embodiment is configured such that the ventilation resistance of the third outdoor heat exchanger 230c is smaller than the ventilation resistance of the first outdoor heat exchanger 230a.
　実施の形態４に係る室外機２００によれば、各室外熱交換器２３０の通風抵抗を調整することで、各室外熱交換器２３０での熱交換器性能のばらつきを抑制することができる。そのため、風速分布の違いによる熱交換器性能の低下を抑制することができる。 According to the outdoor unit 200 according to the fourth embodiment, by adjusting the ventilation resistance of each outdoor heat exchanger 230, variations in heat exchanger performance among the outdoor heat exchangers 230 can be suppressed. Therefore, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed.
　実施の形態５．
　以下、実施の形態５について説明するが、実施の形態１～４と重複するものについては説明を省略し、実施の形態１～４と同じ部分または相当する部分には同じ符号を付す。 Embodiment 5.
Embodiment 5 will be described below, but the description of parts that overlap with Embodiments 1 to 4 will be omitted, and the same or corresponding parts as in Embodiments 1 to 4 will be given the same reference numerals.
　図１４は、実施の形態５に係る室外機２００の冷房運転時の冷媒の流れを説明する平面模式図である。図１４に示すように、筐体２０１は、平面視して矩形状であり、四側面のうち三側面に空気が流通する流通面２６１を有し、残りの一側面に空気が流通しない封止面２６０を有している。各流通面２６１には、室外熱交換器２３０（２３０ａ～２３０ｃ）がそれぞれ配置されている。つまり、筐体２０１には、３つの室外熱交換器２３０が設けられている。 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 casing 201 has a rectangular shape in plan view, and has a circulation surface 261 through which air flows on three of the four sides, and a seal that prevents air circulation on the remaining one side. It has a surface 260. Outdoor heat exchangers 230 (230a to 230c) are arranged on each circulation surface 261, respectively. That is, the housing 201 is provided with three outdoor heat exchangers 230.
　図１４に示すように、冷房運転時では、斜線矢印で示すように室外機２００の内部を冷媒が流れる。封止面２６０を基準として室外ファン２５０の回転方向（破線黒矢印）の順に並んだ室外熱交換器２３０を、それぞれ一番目の室外熱交換器２３０ａ、二番目の室外熱交換器２３０ｂ、三番目の室外熱交換器２３０ｃとしたとき、一番目の室外熱交換器２３０ａおよび三番目の室外熱交換器２３０ｃが冷媒流れの上流側、二番目の室外熱交換器２３０ｂが冷媒流れの下流側となるように室外熱交換器２３０がそれぞれ冷媒配管２０３で接続されている。そして、各室外熱交換器２３０は、冷房運転時に、ガス冷媒（実線黒矢印）が空気の流れ（白矢印）に対して対向流となるように配置されている。また、図１４に示すように、一番目の室外熱交換器２３０ａと三番目の室外熱交換器２３０ｃとを接続する冷媒配管２０３に、絞り装置２８０が設けられている。 As shown in FIG. 14, during cooling operation, refrigerant flows inside the outdoor unit 200 as indicated by the diagonal arrow. The outdoor heat exchangers 230 arranged in the order of rotation direction (broken line black arrow) of the outdoor fan 250 with the sealing surface 260 as a reference are the first outdoor heat exchanger 230a, the second outdoor heat exchanger 230b, and the third outdoor heat exchanger 230a, respectively. When the outdoor heat exchanger 230c is assumed as The outdoor heat exchangers 230 are connected by refrigerant pipes 203, respectively. Each outdoor heat exchanger 230 is arranged so that the gas refrigerant (solid black arrow) flows counter to the air flow (white arrow) during cooling operation. Further, 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.
　実施の形態５では、二番目の室外熱交換器２３０ｂと三番目の室外熱交換器２３０ｃとの間の流動抵抗Ｒ２３が、二番目の室外熱交換器２３０ｂと一番目の室外熱交換器２３０ａとの間の流動抵抗Ｒ２１よりも大きくなるように（Ｒ２３＞Ｒ２１）、冷媒配管２０３が構成されている。冷媒配管２０３によって流動抵抗を大きくするには、例えば、冷媒配管２０３の径を細くする、冷媒配管２０３の曲げ部の数を多くする、あるいは、絞り装置２８０のＣｖ値を小さくするなどがある。なお、絞り装置２８０は、例えば電子式膨張弁であり、その電子式膨張弁でＣｖ値が調整されているものでもよい。このようにすることで、風速が大きい風が流れる場所に多くの冷媒が流れ、風速が小さい風が流れる場所に少ない冷媒が流れる。 In the fifth embodiment, the flow resistance R23 between the second outdoor heat exchanger 230b and the third outdoor heat exchanger 230c is the same as that between the second outdoor heat exchanger 230b and the first outdoor heat exchanger 230a. The refrigerant pipe 203 is configured so that the flow resistance between the two ends is greater than the flow resistance R21 (R23>R21). To increase the flow resistance of the refrigerant pipe 203, for example, the diameter of the refrigerant pipe 203 can be made smaller, the number of bent parts of the refrigerant pipe 203 can be increased, or the Cv value of the expansion device 280 can be made smaller. Note that the expansion device 280 is, for example, an electronic expansion valve, and the Cv value may be adjusted by the electronic expansion valve. By doing this, a large amount of refrigerant flows in places where wind flows with high wind speed, and a small amount of refrigerant flows in places where wind flows with low wind speed.
（実施の形態５の効果）
　流動抵抗Ｒ２３を流動抵抗Ｒ２１よりも大きくすることで、風速分布にマッチした冷媒流量を各室外熱交換器２３０に供給することができ、各室外熱交換器２３０での熱交換器性能のばらつきを抑制することができるので、風速分布の違いによる熱交換器性能の低下を抑制することができる。 (Effects of Embodiment 5)
By making the flow resistance R23 larger than the flow resistance R21, a refrigerant flow rate that matches the wind speed distribution can be supplied to each outdoor heat exchanger 230, and variations in heat exchanger performance among the outdoor heat exchangers 230 can be reduced. Therefore, it is possible to suppress deterioration in heat exchanger performance due to differences in wind speed distribution.
　以上、実施の形態５に係る室外機２００は、二番目の室外熱交換器２３０ｂと一番目の室外熱交換器２３０ａとの間の流動抵抗Ｒ２１よりも二番目の室外熱交換器２３０ｂと三番目の室外熱交換器２３０ｃとの間の流動抵抗Ｒ２３の方が大きい。 As described above, in the outdoor unit 200 according to the fifth embodiment, the flow resistance R21 between the second outdoor heat exchanger 230b and the first outdoor heat exchanger 230a is higher than the flow resistance R21 between the second outdoor heat exchanger 230b and the third outdoor heat exchanger 230a. The flow resistance R23 between the outdoor heat exchanger 230c and the outdoor heat exchanger 230c is larger.
　実施の形態５に係る室外機２００によれば、流動抵抗Ｒ２３を流動抵抗Ｒ２１よりも大きくすることで、風速分布にマッチした冷媒流量を各室外熱交換器２３０に供給することができ、各室外熱交換器２３０での熱交換器性能のばらつきを抑制することができる。そのため、風速分布の違いによる熱交換器性能の低下を抑制することができる。 According to the outdoor unit 200 according to the fifth embodiment, by making the flow resistance R23 larger than the flow resistance R21, a refrigerant flow rate that matches the wind speed distribution can be supplied to each outdoor heat exchanger 230, and each outdoor Variations in heat exchanger performance in the heat exchanger 230 can be suppressed. Therefore, deterioration in heat exchanger performance due to differences in wind speed distribution can be suppressed.
　１　冷媒回路、１００　室内機、１１０　室内熱交換器、１２０　絞り装置、１３０　室内ファン、２００　室外機、２０１　筐体、２０２　吹き出し口、２０３　冷媒配管、２１０　圧縮機、２２０　流路切替装置、２３０　室外熱交換器、２３０ａ　室外熱交換器、２３０ｂ　室外熱交換器、２３０ｃ　室外熱交換器、２３１　扁平管群、２３２　扁平管、２３３　フィン、２３４　分配ヘッダ、２３６　液配管、２３７　ガス配管、２３８　列渡しヘッダ、２３９　列間接続配管、２４０　アキュムレータ、２５０　室外ファン、２６０　封止面、２６１　流通面、２８０　絞り装置、３００　冷媒配管。 1 Refrigerant circuit, 100 Indoor unit, 110 Indoor heat exchanger, 120 Throttle 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 Column transfer header , 239 Inter-row connection piping, 240 Accumulator, 250 Outdoor fan, 260 Sealing surface, 261 Flow surface, 280 Throttle device, 300 Refrigerant piping.

Claims (6)

  1. 　上部中央に吹き出し口を有し、平面視して矩形状の筐体と、
    　前記筐体の内部に設けられた３つの室外熱交換器と、
    　前記３つの室外熱交換器の上方に配置され、前記吹き出し口から上向きに空気を吹き出す室外ファンと、を備え、
    　前記３つの室外熱交換器のそれぞれは、
    　上下方向を管延伸方向とし、互いに平行となるように扁平面を対向させた、内部を冷媒が流れる複数の扁平管で構成された扁平管群を備え、
    　前記筐体は、四側面のうち三側面に空気が流通する流通面を有し、残りの一側面に空気が流通しない封止面を有し、
    　前記３つの室外熱交換器は、前記流通面に沿ってそれぞれ設けられており、
    　前記封止面を基準として前記室外ファンの回転方向の順に並んだ前記３つの室外熱交換器を、それぞれ一番目の室外熱交換器、二番目の室外熱交換器、三番目の室外熱交換器としたとき、冷房運転時において、前記一番目の室外熱交換器および前記三番目の室外熱交換器が冷媒流れの上流側、前記二番目の室外熱交換器が冷媒流れの下流側となるように前記３つの室外熱交換器がそれぞれ接続されている
    　室外機。     A housing having an air outlet in the center of the top and having a rectangular shape when viewed from above;
    three outdoor heat exchangers provided inside the housing;
    an outdoor fan that is disposed above the three outdoor heat exchangers and blows air upward from the outlet;
    Each of the three outdoor heat exchangers is
    It comprises a flat tube group made up of a plurality of flat tubes in which the refrigerant flows, the vertical direction being the tube extending direction, the flat surfaces facing each other so as to be parallel to each other,
    The casing has a circulation surface through which air circulates on three of the four sides, and a sealing surface through which air does not circulate on the remaining one side,
    The three outdoor heat exchangers are each provided along the flow surface,
    The three outdoor heat exchangers arranged in the rotational direction of the outdoor fan with the sealing surface as a reference are a first outdoor heat exchanger, a second outdoor heat exchanger, and a third outdoor heat exchanger, respectively. Then, during cooling operation, 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. The three outdoor heat exchangers are each connected to an outdoor unit.
  2. 　前記３つの室外熱交換器のそれぞれは、
    　前記扁平管群が空気の流れ方向に２列に並んで配置されており、
    　高さ方向において同方向に配置され、各前記扁平管群の一端が挿入された２つの分配ヘッダと、
    　２つの前記扁平管群の他端が挿入された列渡しヘッダと、を備え、
    　冷房運転時においてガス冷媒が空気の流れに対して対向流となるように、風下側に配置された前記扁平管群の一端が挿入された前記分配ヘッダに冷媒入口が設けられている
    　請求項１に記載の室外機。     Each of the three outdoor heat exchangers is
    The flat tube group is 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 groups is inserted;
    a column-crossing header into which the other ends of the two flat tube groups are inserted;
    A refrigerant inlet is provided in the distribution header into which one end of the flat tube group disposed on the leeward side is inserted so that the gas refrigerant flows in a counterflow to the air flow during cooling operation. The outdoor unit described in .
  3. 　前記３つの室外熱交換器のそれぞれは、
    　前記扁平管群が空気の流れ方向に２列に並んで配置されており、
    　各前記扁平管群の両端が挿入された４つの分配ヘッダを備え、
    　冷房運転時においてガス冷媒が空気の流れに対して対向流となるように、風下側に配置された前記扁平管群の一端が挿入された前記分配ヘッダに冷媒入口が設けられており、
    　風下側に配置された前記扁平管群の他端が挿入された前記分配ヘッダと、該分配ヘッダと高さ方向において同方向に配置され、かつ、風上側に配置された前記扁平管群の一端が挿入された前記分配ヘッダとは、列間接続配管で接続されている
    　請求項１に記載の室外機。     Each of the three outdoor heat exchangers is
    The flat tube group is arranged in two rows in the air flow direction,
    comprising four distribution headers into which both ends of each flat tube group are inserted;
    A refrigerant inlet is provided in the distribution header into which one end of the flat tube group disposed on the leeward side is inserted so that the gas refrigerant flows in a counterflow to the air flow during cooling operation;
    The distribution header into which the other end of the flat tube group placed on the leeward side is inserted, and one end of the flat tube group placed in the same height direction as the distribution header and placed on the windward side. The outdoor unit according to claim 1, wherein the distribution header into which is inserted is connected to the distribution header through inter-row connection piping.
  4. 　前記三番目の室外熱交換器の通風抵抗は、前記一番目の室外熱交換器の通風抵抗よりも小さくなるように構成されている
    　請求項１～３のいずれか一項に記載の室外機。     The outdoor unit according to any one of claims 1 to 3, wherein the third outdoor heat exchanger is configured to have a lower ventilation resistance than the first outdoor heat exchanger.
  5. 　前記二番目の室外熱交換器と前記一番目の室外熱交換器との間の流動抵抗よりも前記二番目の室外熱交換器と前記三番目の室外熱交換器との間の流動抵抗の方が大きい
    　請求項１～４のいずれか一項に記載の室外機。     The flow resistance between the second outdoor heat exchanger and the third outdoor heat exchanger is greater than the 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 4, wherein the outdoor unit is large.
  6. 　請求項１～５のいずれか一項に記載の室外機と、
    　室内機と、を備えた
    　空気調和装置。     The outdoor unit according to any one of claims 1 to 5,
    An air conditioner equipped with an indoor unit.
PCT/JP2022/016980 2022-04-01 2022-04-01 Outdoor unit and air conditioner equipped with same WO2023188421A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013130330A (en) * 2011-12-21 2013-07-04 Sanyo Electric Co Ltd Air conditioning device, and heat exchanger
CN203132097U (en) * 2013-03-05 2013-08-14 广东美的电器股份有限公司 Air conditioner and heat exchange system thereof
WO2015162689A1 (en) * 2014-04-22 2015-10-29 三菱電機株式会社 Air conditioner
WO2016208042A1 (en) * 2015-06-25 2016-12-29 三菱電機株式会社 Air-conditioning device
JP2019215161A (en) * 2018-06-11 2019-12-19 三菱電機株式会社 Outdoor machine of air conditioner, and air conditioner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013130330A (en) * 2011-12-21 2013-07-04 Sanyo Electric Co Ltd Air conditioning device, and heat exchanger
CN203132097U (en) * 2013-03-05 2013-08-14 广东美的电器股份有限公司 Air conditioner and heat exchange system thereof
WO2015162689A1 (en) * 2014-04-22 2015-10-29 三菱電機株式会社 Air conditioner
WO2016208042A1 (en) * 2015-06-25 2016-12-29 三菱電機株式会社 Air-conditioning device
JP2019215161A (en) * 2018-06-11 2019-12-19 三菱電機株式会社 Outdoor machine of air conditioner, and air conditioner

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