WO2023188421A1 - Unité extérieure et climatiseur équipé de celle-ci - Google Patents

Unité extérieure et climatiseur équipé de celle-ci 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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Prior art keywords
outdoor heat
heat exchanger
outdoor
refrigerant
flow
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PCT/JP2022/016980
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English (en)
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/fr
Priority to JP2024511151A priority patent/JPWO2023188421A1/ja
Publication of WO2023188421A1 publication Critical patent/WO2023188421A1/fr

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

Abstract

Cette unité extérieure comprend : un boîtier présentant une ouverture de soufflage au centre d'une partie supérieure, le boîtier étant rectangulaire dans une vue en plan ; trois échangeurs de chaleur extérieurs disposés à l'intérieur du boîtier ; et un ventilateur extérieur disposé au-dessus des trois échangeurs de chaleur extérieurs, le ventilateur extérieur soufflant de l'air vers le haut à partir de l'ouverture de soufflage. Chacun des trois échangeurs de chaleur extérieurs est doté d'un groupe de tuyaux plats configuré à partir d'une pluralité de tuyaux plats pour lesquels la direction verticale est utilisée comme direction d'extension de tuyau, la pluralité de tuyaux plats étant tels qu'un réfrigérant s'écoule à travers leurs intérieurs et étant agencés de sorte que des surfaces plates de ceux-ci se font face de manière à être parallèles les unes aux autres. Le boîtier présente une surface d'écoulement traversant à travers laquelle de l'air s'écoule sur trois surfaces latérales parmi quatre surfaces latérales, et présente une surface d'étanchéité à travers laquelle de l'air ne s'écoule pas sur la surface latérale restante. Les trois échangeurs de chaleur extérieurs sont disposés le long des surfaces d'écoulement traversant. Dans une opération de refroidissement d'air, les trois échangeurs de chaleur extérieurs sont reliés les uns aux autres de sorte qu'un premier échangeur de chaleur extérieur et un troisième échangeur de chaleur extérieur se trouvent sur le côté amont d'un écoulement de réfrigérant et un second échangeur de chaleur extérieur se trouve sur le côté aval de l'écoulement de réfrigérant, le premier échangeur de chaleur extérieur, le deuxième échangeur de chaleur extérieur et le troisième échangeur de chaleur extérieur étant les trois échangeurs de chaleur extérieurs alignés dans l'ordre le long de la direction de rotation du ventilateur extérieur par rapport à la surface d'étanchéité.
PCT/JP2022/016980 2022-04-01 2022-04-01 Unité extérieure et climatiseur équipé de celle-ci WO2023188421A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013130330A (ja) * 2011-12-21 2013-07-04 Sanyo Electric Co Ltd 空気調和装置、及び、熱交換器
CN203132097U (zh) * 2013-03-05 2013-08-14 广东美的电器股份有限公司 空调器及其热交换系统
WO2015162689A1 (fr) * 2014-04-22 2015-10-29 三菱電機株式会社 Conditionneur d'air
WO2016208042A1 (fr) * 2015-06-25 2016-12-29 三菱電機株式会社 Dispositif de climatisation
JP6595125B1 (ja) 2018-06-11 2019-10-23 三菱電機株式会社 空気調和装置の室外機及び空気調和装置
JP2019215161A (ja) * 2018-06-11 2019-12-19 三菱電機株式会社 空気調和装置の室外機及び空気調和装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013130330A (ja) * 2011-12-21 2013-07-04 Sanyo Electric Co Ltd 空気調和装置、及び、熱交換器
CN203132097U (zh) * 2013-03-05 2013-08-14 广东美的电器股份有限公司 空调器及其热交换系统
WO2015162689A1 (fr) * 2014-04-22 2015-10-29 三菱電機株式会社 Conditionneur d'air
WO2016208042A1 (fr) * 2015-06-25 2016-12-29 三菱電機株式会社 Dispositif de climatisation
JP6595125B1 (ja) 2018-06-11 2019-10-23 三菱電機株式会社 空気調和装置の室外機及び空気調和装置
JP2019215161A (ja) * 2018-06-11 2019-12-19 三菱電機株式会社 空気調和装置の室外機及び空気調和装置

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