WO2024042575A1 - Échangeur de chaleur et dispositif à cycle de réfrigération - Google Patents

Échangeur de chaleur et dispositif à cycle de réfrigération Download PDF

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Publication number
WO2024042575A1
WO2024042575A1 PCT/JP2022/031523 JP2022031523W WO2024042575A1 WO 2024042575 A1 WO2024042575 A1 WO 2024042575A1 JP 2022031523 W JP2022031523 W JP 2022031523W WO 2024042575 A1 WO2024042575 A1 WO 2024042575A1
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Prior art keywords
refrigerant
heat exchanger
tube
refrigerant distributor
outdoor heat
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PCT/JP2022/031523
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English (en)
Japanese (ja)
Inventor
伸吾 笠木
哲二 七種
洋次 尾中
祐基 中尾
理人 足立
Original Assignee
三菱電機株式会社
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Priority to PCT/JP2022/031523 priority Critical patent/WO2024042575A1/fr
Publication of WO2024042575A1 publication Critical patent/WO2024042575A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates

Definitions

  • the present disclosure relates to a heat exchanger and a refrigeration cycle device having a plurality of flat tubes.
  • Some conventional refrigeration cycle apparatuses having a plurality of heat exchangers are constructed from a plurality of heat exchangers, with one or more heat exchangers forming one set (for example, see Patent Document 1).
  • the heat exchanger is composed of an air heat exchanger, and includes an upper header pipe, a lower header pipe, a heat transfer tube, and fins.
  • the sets are connected in series, and a series refrigerant flow path is formed in which the refrigerant flows in series between the sets.
  • the refrigerant flows from top to bottom through the heat transfer tubes of all the heat exchangers.
  • the sets are connected in parallel, and a parallel refrigerant flow path is formed in which the refrigerant flows in parallel to each set.
  • the refrigerant flows from bottom to top through the heat transfer tubes of all the heat exchangers.
  • a refrigerant distributor having a double pipe structure including an inner pipe and an outer pipe is used as a lower header pipe, for example.
  • a plurality of outer tubes are provided, and a gap is formed between adjacent outer tubes among the plurality of outer tubes.
  • One inner tube is provided continuously for the plurality of outer tubes.
  • a plurality of heat transfer tubes are connected to the outer tube in the tube axis direction of the outer tube, and the refrigerant flowing between the inner tube and the outer tube is distributed to the plurality of heat transfer tubes.
  • a gas-liquid two-phase refrigerant in which gas refrigerant and liquid refrigerant are mixed flows into the heat exchanger.
  • a refrigerant distributor having a double pipe structure composed of an inner tube and an outer tube may be used as the refrigerant distributor on the inflow side of the heat exchanger.
  • a large number of refrigerant outlet holes are arranged in parallel in the inner pipe.
  • a refrigerant distributor having a double tube structure can reduce the volume of the refrigerant distributor while evenly distributing the refrigerant to a plurality of heat transfer tubes that constitute a heat exchanger.
  • a refrigerant distributor with a single-pipe structure is provided on the outflow side of the heat exchanger that functions as an evaporator.
  • the refrigerant distributor has a function of distributing refrigerant to a plurality of heat transfer tubes that constitute the heat exchanger when the heat exchanger functions as a condenser.
  • the gas refrigerant flows in a single phase into the heat exchanger located on the upstream side.
  • the downstream heat exchanger a part of the gas refrigerant condenses during heat exchange in the upstream heat exchanger, so a gas-liquid two-phase state where gas refrigerant and liquid refrigerant are mixed is generated.
  • Refrigerant will flow in.
  • the refrigerant distributor on the inflow side of the heat exchanger located downstream is a refrigerant distributor with a single-pipe structure. Therefore, in the heat exchanger located on the downstream side, the refrigerant flowing into the heat exchanger is not evenly distributed to the plurality of flat tubes that constitute the heat exchanger.
  • the amount of refrigerant distributed is uneven depending on the position of the flat tube, so the amount of heat exchange is insufficient near the flat tube where more refrigerant is distributed, and less refrigerant is distributed. There is a problem in that the amount of heat exchanged is excessive near the flat tubes, and the heat exchange efficiency decreases.
  • the present disclosure has been made to solve such problems, and is one heat exchanger among a plurality of heat exchangers that function as a condenser during cooling operation, the heat exchangers being connected in series.
  • the heat exchanger includes a plurality of first flat tubes arranged at intervals in a first direction and whose tube axis direction extends in a second direction intersecting the first direction. 1 heat exchanger, a first refrigerant distributor into which one end portion of the plurality of first flat tubes is inserted, and a second refrigerant distributor into which the other end portion of the plurality of first flat tubes is inserted.
  • the first refrigerant distributor includes a first outer tube extending in the first direction and into which the one ends of the plurality of first flat tubes are inserted; a first inner tube disposed inside the first outer tube, the first inner tube having a plurality of first refrigerant outflow holes spaced apart from each other in the first direction; and the first inner tube penetrating through the plate thickness. and a first partition plate joined to the inner wall of the first outer tube, the second refrigerant distributor extending in the first direction and connecting the plurality of first flat tubes. a second outer tube into which the other end is inserted; and a plurality of outer tubes extending in the first direction, disposed inside the second outer tube, and spaced apart from each other in the first direction. A second inner pipe having two refrigerant outflow holes, and a second partition plate joined to the inner wall of the second outer pipe with the second inner pipe penetrating the plate thickness. .
  • a refrigeration cycle device is a refrigeration cycle device including an outdoor unit, wherein the outdoor unit includes the above heat exchanger, a second heat exchanger, and the heat exchanger and the second heat exchanger.
  • refrigerant piping that connects the heat exchanger and the second heat exchanger; a box-shaped casing that houses the heat exchanger and the second heat exchanger; a blower that blows out the air that has passed through the heat exchanger and the second heat exchanger upward from the top surface of the housing,
  • the containers are arranged along some or all of the four sides of the housing.
  • the refrigerant distributor is configured with a double pipe structure, and a plurality of refrigerant outlet holes are arranged in parallel in the inner pipe of the refrigerant distributor. Therefore, even when refrigerant flows into a heat exchanger in a gas-liquid two-phase state, the provision of the refrigerant distributor prevents the situation where the refrigerant is unevenly distributed to multiple flat tubes. It can be suppressed. In addition, by uniformly distributing the refrigerant to the plurality of flat tubes, the required amount of heat exchange becomes uniform over the entire surface of the heat exchanger, and a decrease in heat exchange efficiency can be prevented.
  • FIG. 1 is a refrigerant circuit diagram showing the configuration of a refrigeration cycle device 100 according to Embodiment 1.
  • FIG. FIG. 2 is a perspective view showing a connected state of outdoor heat exchanger 3 and outdoor heat exchanger 4 in refrigeration cycle device 100 according to Embodiment 1.
  • FIG. 3 is a sectional view showing the configuration of the outdoor heat exchanger 3 shown in FIG. 2.
  • FIG. 3 is a sectional view showing the configuration of the outdoor heat exchanger 4 shown in FIG. 2.
  • FIG. 4 is a cross-sectional view showing the configuration of a refrigerant distributor 31 provided in the outdoor heat exchanger 3 shown in FIG. 3.
  • FIG. 4 is a cross-sectional view showing the configuration of a refrigerant distributor 32 provided in the outdoor heat exchanger 3 shown in FIG. 3.
  • FIG. 3 is a sectional view showing the configuration of a refrigerant distributor 31 provided in the outdoor heat exchanger 3 shown in FIG. 3.
  • FIG. 4 is a cross-sectional view showing the configuration of a ref
  • FIG. 5 is a cross-sectional view showing the configuration of a refrigerant distributor 41 provided in the outdoor heat exchanger 4 shown in FIG. 4.
  • FIG. 5 is a sectional view showing the configuration of a refrigerant distributor 42 provided in the outdoor heat exchanger 4 shown in FIG. 4.
  • FIG. FIG. 2 is a perspective view showing a connected state of outdoor heat exchanger 3 and outdoor heat exchanger 4 in a heating operation state in refrigeration cycle device 100 according to Embodiment 1.
  • FIG. FIG. 3 is a diagram schematically showing a refrigerant distribution operation in a refrigerant distributor 31 provided in the refrigeration cycle device 100 according to the first embodiment.
  • FIG. 3 is a diagram schematically showing a refrigerant distribution operation in refrigerant distributors 32, 41, and 42 provided in the refrigeration cycle device 100 according to the first embodiment.
  • FIG. 3 is a diagram schematically showing the state of liquid refrigerant in a refrigerant distributor 31 provided in the refrigeration cycle device 100 according to the first embodiment.
  • 3 is a diagram schematically showing the state of liquid refrigerant in refrigerant distributors 32, 41, and 42 provided in refrigeration cycle device 100 according to Embodiment 1.
  • FIG. 2 is a refrigerant circuit diagram showing the configuration of a refrigeration cycle device 100 according to a first modification of the first embodiment.
  • FIG. 2 is a refrigerant circuit diagram showing the configuration of a refrigeration cycle device 100 according to a first modification of the first embodiment.
  • FIG. 2 is a refrigerant circuit diagram showing the configuration of a refrigeration cycle device 100 according to a second modification of the first embodiment.
  • FIG. FIG. 7 is a diagram showing the flow of refrigerant when the refrigeration cycle device 100 according to the second modification of the first embodiment is in a cooling operation state. The flow of refrigerant is shown when the refrigeration cycle device 100 according to the second modification of the first embodiment is in a heating operation state.
  • FIG. 3 is a perspective view showing a connection state of an outdoor heat exchanger 3C and an outdoor heat exchanger 4C in a refrigeration cycle device 100 according to a second embodiment.
  • FIG. 7 is a perspective view showing the appearance of an outdoor unit 101 provided in a refrigeration cycle device 100 according to a third embodiment.
  • FIG. 7 is a plan view schematically showing an example of the configuration of an outdoor unit 101 provided in a refrigeration cycle device 100 according to Embodiment 3.
  • FIG. 7 is a perspective view showing the appearance of an outdoor unit 101 provided in a refrigeration cycle device 100 according to a modification of the third embodiment.
  • 7 is a plan view schematically showing an example of the configuration of an outdoor unit 101 provided in a refrigeration cycle device 100 according to Embodiment 3.
  • FIG. 7 is a plan view schematically showing an example of the configuration of an outdoor unit 101 provided in a refrigeration cycle device 100 according to Embodiment 3.
  • the width direction of each outdoor heat exchanger is called the X direction
  • the height direction is called the Z direction
  • the depth direction is called the Y direction.
  • the X direction and the Y direction are, for example, horizontal directions.
  • the Z direction is, for example, an up-down direction, and may be a vertical direction.
  • the X direction is the direction in which the plurality of flat tubes are stacked.
  • the Z direction is the axial direction of the flat tube, and is the direction in which the refrigerant flows.
  • the Y direction is the direction in which air flows.
  • the X direction is sometimes called a "first direction” or a "third direction.”
  • the Z direction is sometimes referred to as the "second direction.”
  • FIG. 1 is a refrigerant circuit diagram showing the configuration of a refrigeration cycle device 100 according to the first embodiment.
  • the refrigeration cycle device 100 has an outdoor unit 101 and an indoor unit 201, and a refrigeration cycle is configured by connecting the outdoor unit 101 and the indoor unit 201 with a refrigerant pipe 310.
  • the refrigerant pipe 310 includes a plurality of refrigerant pipes 300 to 308.
  • these refrigerant pipes 300 to 308 are collectively called a refrigerant pipe 310.
  • the outdoor unit 101 and the indoor unit 201 are connected through connection ports P1 and P2. Both the connection port P1 and the connection port P2 are configured from refrigerant piping 310.
  • connection port P1 is an inflow side connection port to the outdoor unit 101 in the cooling operation state of the refrigeration cycle device 100, and an outflow side connection port from the outdoor unit 101 in the heating operation state.
  • the connection port P2 is an outflow side connection port from the outdoor unit 101 in the cooling operation state of the refrigeration cycle device 100, and an inflow side connection port to the outdoor unit 101 in the heating operation state.
  • one outdoor unit 101 and one indoor unit 201 are installed, but the number of outdoor units 101 and the number of indoor units 201 are not limited to one. There may be a plurality of each.
  • a fluorocarbon refrigerant or an HFO refrigerant for example, is sealed as a refrigerant.
  • fluorocarbon refrigerants examples include HFC (fluorinated hydrocarbon, hydrofluorocarbon) refrigerants.
  • HFC refrigerants include difluoromethane (HFC-32, R32), pentafluoroethane (HFC-125, R125), 1,1,1-trifluoroethane (HFC-143a, R143a), 1,1, Examples include 1,2-tetrafluoroethane (HFC-134a, R134a).
  • other examples of the fluorocarbon refrigerant include a mixed refrigerant obtained by mixing the above-mentioned HFC refrigerants.
  • mixed refrigerants examples include “R410A” which is a mixed refrigerant of R32 and R125, “R407C” which is a mixed refrigerant of R32, R125 and R134a, and “R404A” which is a mixed refrigerant of R125, R143a and R134a. ” etc.
  • HFO (hydrofluoroolefin) refrigerant examples include HFO-1234yf, HFO-1234ze (E), and HFO-1234ze (Z).
  • the refrigerant sealed in the refrigerant circuit that constitutes the refrigeration cycle device 100 is not limited to the above example, and refrigerants used in vapor compression heat pumps can be used.
  • refrigerants used in vapor compression heat pumps can be used.
  • CO 2 refrigerant, HC refrigerant (eg, propane, isobutane refrigerant), ammonia refrigerant, etc. can be used as the refrigerant.
  • HC refrigerant eg, propane, isobutane refrigerant
  • ammonia refrigerant, etc. can be used as the refrigerant.
  • a mixed refrigerant of a fluorocarbon refrigerant and an HFO refrigerant such as a mixed refrigerant of R32 and HFO-1234yf, can also be used as the refrigerant.
  • the outdoor unit 101 includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an outdoor heat exchanger 4, an expansion valve 5, an expansion valve 6, a solenoid valve 7, a solenoid valve 8, two outdoor blowers 9, an accumulator 10, It also has refrigerant pipes 300 to 306 that connect these components.
  • the compressor 1 is a fluid machine that compresses sucked low-pressure refrigerant and discharges it as high-pressure refrigerant.
  • the compressor 1 is configured, for example, as a rotary compressor or a scroll compressor.
  • the compressor 1 may be configured, for example, as a compressor with a constant rotational frequency, or may be configured as a compressor equipped with an inverter and whose rotational frequency can be controlled.
  • the four-way valve 2 is a flow path switching device that is provided on the discharge side of the compressor 1 and switches between the refrigerant circulation direction in the cooling operation state and the refrigerant circulation direction in the heating operation state.
  • the four connection ports 2a to 2d of the four-way valve 2 are connected to the compressor 1, the outdoor heat exchanger 3, the accumulator 10, and the connection port P1 that connects the outdoor unit 101 and the indoor unit 201.
  • the connection port 2a on the compressor 1 side is the connection port 2b on the outdoor heat exchanger 3 side, or the connection port 2d on the connection port P2 side of the outdoor unit 101. One of them is selected and connected.
  • connection port that is not selected among the connection ports 2b and 2d is connected to the connection port 2c that is connected to the accumulator 10.
  • the connection port 2a is connected to the connection port 2b
  • the connection port 2d is connected to the connection port 2c.
  • the connection port 2a is connected to the connection port 2d
  • the connection port 2b is connected to the connection port 2c.
  • the outdoor heat exchanger 3 is a heat exchanger that can exchange heat between the refrigerant flowing inside and air.
  • the outdoor heat exchanger 3 functions as a condenser during cooling operation, and functions as an evaporator during heating operation.
  • the outdoor heat exchanger 3 is connected to the four-way valve 2 by a refrigerant pipe 300, and the refrigerant pipe 300 branches into a refrigerant pipe 301 between the outdoor heat exchanger 3 and the four-way valve 2.
  • Refrigerant pipe 301 is connected to solenoid valve 8 .
  • the outdoor heat exchanger 3 has connection ports 3a and 3b connected to refrigerant piping.
  • the connection port 3a is connected to the four-way valve 2.
  • a connection port 3b on the opposite side that has passed through the inside from the connection port 3a is connected to the expansion valve 5 via a refrigerant pipe 302.
  • the refrigerant pipe 302 branches into a refrigerant pipe 303 between the outdoor heat exchanger 3 and the expansion valve 5.
  • Refrigerant pipe 303 is connected to solenoid valve 7 .
  • the outdoor blower 9 is configured as, for example, a centrifugal fan such as a sirocco fan or a turbo fan, a cross flow fan, a mixed flow fan, or a propeller fan. Note that the outdoor heat exchanger 3 corresponds to the "second heat exchanger" in the first embodiment.
  • the outdoor heat exchanger 4 is a heat exchanger that can exchange heat between the refrigerant flowing inside and air.
  • the outdoor heat exchanger 4 functions as a condenser during cooling operation, and functions as an evaporator during heating operation.
  • the outdoor heat exchanger 4 is connected to the solenoid valve 8 via a refrigerant pipe 301.
  • the refrigerant pipe 301 branches into the above-mentioned refrigerant pipe 303 between the outdoor heat exchanger 4 and the solenoid valve 8.
  • the outdoor heat exchanger 4 has connection ports 4a and 4b connected to refrigerant piping.
  • the connection port 4a is connected to the four-way valve 2 via a solenoid valve 8.
  • connection port 4 b on the opposite side that has passed through the inside from the connection port 4 a is connected to the expansion valve 6 via a refrigerant pipe 304 .
  • the refrigerant pipe 304 provided with the expansion valve 6 merges with the refrigerant pipe 302 provided with the expansion valve 5.
  • a confluence point between the refrigerant pipe 304 and the refrigerant pipe 302 is connected to the connection port P2.
  • the connection port P2 serves as a connection port on the outflow side from the outdoor unit 101 in the cooling operation state and on the inflow side to the outdoor unit 101 in the heating operation state.
  • the expansion valve 5 and the expansion valve 6 have a function as a pressure reducing valve or an expansion valve, and reduce the pressure of the refrigerant and expand it.
  • the expansion valve 5 and the expansion valve 6 are configured as a pressure reducing device such as a linear electronic expansion valve whose opening degree can be adjusted in multiple stages or continuously.
  • the solenoid valve 7 and the solenoid valve 8 have a function of opening and closing the flow path depending on whether or not a voltage is applied, and switch the flow path of the refrigerant by blocking and opening the flow of the refrigerant.
  • the accumulator 10 is provided in such a way that the outflow side of the accumulator 10 is connected to the suction side of the compressor 1.
  • the accumulator 10 has a function of separating liquid refrigerant and gas refrigerant and a function of storing surplus refrigerant.
  • the inflow side of the accumulator 10 is connected to the connection port 2c of the four-way valve 2 through a refrigerant pipe 306.
  • the outdoor unit 101 is provided with a control section 11.
  • the control unit 11 controls the operations of the compressor 1 , the four-way valve 2 , the expansion valve 5 , the expansion valve 6 , the solenoid valve 7 , the solenoid valve 8 , and the two outdoor blowers 9 .
  • the control unit 11 is composed of a processing circuit.
  • the processing circuitry consists of dedicated hardware or a processor.
  • the dedicated hardware is, for example, an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).
  • a processor executes programs stored in memory.
  • the control section 11 has a storage section (not shown).
  • the storage unit is composed of memory.
  • Memory can be nonvolatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, or EPROM (Erasable Programmable ROM), or disks such as magnetic disks, flexible disks, or optical disks. be.
  • the indoor unit 201 includes an indoor heat exchanger 21, an indoor blower 22, an expansion valve 23, and refrigerant pipes 307 and 308 that connect these components.
  • the indoor unit 201 and the outdoor unit 101 constitute a refrigeration cycle.
  • the indoor unit 201 supplies cold heat or heat from the outdoor unit 101 to a cooling load or a heating load.
  • the refrigerant load and the heating load are, for example, the indoor space in which the indoor unit 201 is installed.
  • the indoor heat exchanger 21 is a heat exchanger that can exchange heat between the refrigerant flowing inside and air.
  • the indoor heat exchanger 21 functions as an evaporator during cooling operation, and functions as a condenser during heating operation.
  • Indoor heat exchanger 21 has connection ports 21a and 21b connected to refrigerant piping.
  • the connection port 21a is connected to the expansion valve 23 via a refrigerant pipe 307.
  • a connection port 21b on the opposite side that has passed inside from the connection port 21a is connected to the connection port P1 via a refrigerant pipe 308.
  • the indoor blower 22 is configured as, for example, a centrifugal fan such as a sirocco fan or a turbo fan, a cross flow fan, a mixed flow fan, or a propeller fan.
  • the expansion valve 23 has a function as a pressure reducing valve or an expansion valve, and reduces the pressure of the refrigerant to expand it.
  • the expansion valve 23 is configured, for example, as a pressure reducing device such as a linear electronic expansion valve whose opening degree can be adjusted in multiple stages or continuously.
  • ⁇ Operation of refrigeration cycle device 100> ⁇ Cooling operation status (serial refrigerant flow path)>
  • the control unit 11 causes the expansion valve 5 to be in the fully closed state, the solenoid valve 7 to be in the open state, the solenoid valve 8 to be in the closed state, and the expansion valve 6 to be in the fully open state.
  • Compressor 1 sucks refrigerant from accumulator 10 and compresses the refrigerant.
  • the compressed refrigerant becomes a gas refrigerant and is discharged from the compressor 1, and flows into the outdoor heat exchanger 3 via the four-way valve 2.
  • the gas refrigerant As a part of the gas refrigerant is condensed in the outdoor heat exchanger 3, the gas refrigerant enters a gas-liquid two-phase state of gas refrigerant and liquid refrigerant.
  • the gas-liquid two-phase refrigerant passes through the solenoid valve 7 and flows into the outdoor heat exchanger 4 .
  • the refrigerant condensed in the outdoor heat exchanger 4 becomes a liquid refrigerant.
  • the liquid refrigerant passes through the expansion valve 6, flows out of the outdoor unit 101, and flows into the indoor unit 201. In the indoor unit 201, the refrigerant is depressurized by the expansion valve 23 and then evaporated in the indoor heat exchanger 21 to supply cold heat to the air.
  • the refrigerant flows out of the indoor unit 201, flows into the outdoor unit 101, passes through the refrigerant pipe 305, and flows into the four-way valve 2.
  • the refrigerant then flows out from the four-way valve 2, passes through the refrigerant pipe 306, and flows into the accumulator 10. Thereafter, the refrigerant is sucked into the compressor 1 again from the accumulator 10 and circulates through the refrigerant circuit. This results in a refrigerant circuit having a refrigerant flow path in which the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are connected in series.
  • ⁇ Heating operation status (in case of serial refrigerant flow path)>
  • the control unit 11 controls the expansion valve 5 to be in the fully closed state, the solenoid valve 7 to be in the open state, the solenoid valve 8 to be in the closed state, and the expansion valve 6 to be in the fully open state, as in the case of the cooling operation state.
  • Compressor 1 sucks refrigerant from accumulator 10 and compresses the refrigerant.
  • the compressed refrigerant becomes a gas refrigerant and is discharged from the compressor 1, flows out from the outdoor unit 101 through the four-way valve 2, and flows into the indoor unit 201.
  • the indoor unit 201 heat exchange is performed in the indoor heat exchanger 21, and the refrigerant is condensed.
  • the refrigerant flows into the expansion valve 23 and is depressurized by the expansion valve 23. Thereafter, the refrigerant flows out of the indoor unit 201 and flows into the outdoor unit 101.
  • the outdoor unit 101 the refrigerant flows into the outdoor heat exchanger 4 via the expansion valve 6, and is evaporated by heat exchange. Thereafter, the refrigerant passes through the solenoid valve 7 and flows into the outdoor heat exchanger 3.
  • the refrigerant that has undergone further heat exchange in the outdoor heat exchanger 3 becomes a gaseous refrigerant.
  • the gaseous refrigerant flows into the four-way valve 2.
  • the refrigerant then flows out from the four-way valve 2, passes through the refrigerant pipe 306, and flows into the accumulator 10. Thereafter, the refrigerant is sucked into the compressor 1 again from the accumulator 10 and circulates through the refrigerant circuit. This results in a refrigerant circuit having a refrigerant flow path in which the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are connected in series.
  • FIG. 2 is a perspective view showing the connection state of the outdoor heat exchanger 3 and the outdoor heat exchanger 4 in the refrigeration cycle device 100 according to the first embodiment.
  • the refrigeration cycle device 100 is shown in a cooling operation state.
  • a refrigerant flow path in which the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are connected in series is expressed by a simple connection using refrigerant piping.
  • solid arrows indicate the direction in which the refrigerant flows
  • white arrows indicate the direction of the wind generated by the outdoor blower 9 (ie, the airflow direction).
  • FIG. 3 is a sectional view showing the configuration of the outdoor heat exchanger 3 shown in FIG. 2.
  • FIG. 4 is a sectional view showing the configuration of the outdoor heat exchanger 4 shown in FIG. 2. As shown in FIG.
  • the outdoor heat exchanger 3 includes a refrigerant distributor 31, a refrigerant distributor 32, a plurality of heat exchangers 33, and a folded header 34.
  • a refrigerant pipe 35 is connected to the refrigerant distributor 31, and a refrigerant pipe 36 is connected to the refrigerant distributor 32.
  • the plurality of heat exchange bodies 33 include a heat exchange body 33A and a heat exchange body 33B.
  • the heat exchanger 33A and the heat exchanger 33B are arranged side by side in the airflow direction and face each other.
  • the heat exchanger 33A and the heat exchanger 33B are arranged in two layers in a direction along the direction of the wind generated by the outdoor blower 9.
  • the heat exchange body 33 disposed on the windward side will be referred to as a heat exchange body 33B
  • the heat exchange body 33 disposed on the leeward side will be referred to as a heat exchange body 33A. Since the configurations of the heat exchange body 33A and the heat exchange body 33B are basically the same, they will be collectively described as the heat exchange body 33 below.
  • the heat exchange body 33 is composed of a plurality of flat tubes 37 and a plurality of fins 38.
  • the plurality of flat tubes 37 are arranged side by side in the horizontal direction (namely, the X direction) at intervals from each other. Thereby, the wind generated by the outdoor blower 9 flows between adjacent flat tubes 37 in the direction of the white arrow in FIG.
  • the tube axis direction of the plurality of flat tubes 37 is the Z direction.
  • the refrigerant flows in the Z direction within the flat tube 37. As the refrigerant flows through the flat tube 37, heat exchange is performed between the refrigerant and the air.
  • the fins 38 are arranged between adjacent flat tubes 37 in the X direction.
  • the fins 38 are joined to the side surfaces of the adjacent flat tubes 37 and conduct heat to the flat tubes 37 .
  • the fins 38 improve heat exchange efficiency between air and refrigerant, and are, for example, corrugated fins.
  • the fins 38 are not limited to corrugated fins, and may be flat fins, for example. Further, since heat exchange between the air and the refrigerant is performed on the surface of the flat tube 37, the fins 38 do not necessarily need to be provided.
  • the same fins 38 may be shared between the plurality of heat exchangers 33.
  • FIG. 5 is a sectional view showing the configuration of the refrigerant distributor 31 provided in the outdoor heat exchanger 3 shown in FIG. 3.
  • FIG. 6 is a sectional view showing the configuration of the refrigerant distributor 32 provided in the outdoor heat exchanger 3 shown in FIG.
  • the plurality of flat tubes 37 included in the heat exchanger 33A have tube end portions 37a and 37b at both ends in the tube axis direction.
  • a refrigerant distributor 31 is provided below the lower tube end 37a of the tube ends 37a and 37b.
  • the refrigerant distributor 31 is composed of an outer tube 51 and a connecting tube 52, as shown in FIG.
  • the refrigerant distributor 31 has a single pipe structure.
  • the outer tube 51 is composed of a circular tube, and the tube axis direction is the X direction.
  • a plurality of flat tube insertion holes 51e are provided in the upper surface of the outer tube 51.
  • the plurality of flat tube insertion holes 51e are arranged side by side in the X direction at intervals from each other.
  • the plurality of flat tube insertion holes 51e are through holes that penetrate the upper surface of the outer tube 51.
  • the tube end portion 37a of each flat tube 37 is directly inserted into the flat tube insertion hole 51e of the outer tube 51.
  • the outer tube 51 has tube ends 51a and 51b at both ends in the X direction.
  • a closing plate 51c is provided on the tube end 51a side
  • a closing plate 51d is provided on the tube end 51b side.
  • the tube ends 51a and 51b are closed by closing plates 51c and 51d, respectively, and are not open.
  • the connecting tube 52 is connected to the outer tube 51, as shown in FIG.
  • the tube axis direction of the connecting tube 52 is the Z direction.
  • a lower end portion 52a of the connecting tube 52 is inserted into the outer tube 51.
  • the internal space of the connecting tube 52 and the internal space of the outer tube 51 communicate with each other.
  • the refrigerant distributor 31 is connected to the refrigerant pipe 35, as shown in FIG.
  • the outer pipe 51 of the refrigerant distributor 31 is connected to the refrigerant pipe 35 via the connecting pipe 52.
  • the inside of the refrigerant distributor 31 is one space composed of an internal space of the connecting pipe 52 and an internal space of the outer pipe 51.
  • the refrigerant that has flowed into the internal space of the refrigerant distributor 31 from the refrigerant pipe 35 is directly distributed to the plurality of flat tubes 37 included in the heat exchanger 33A.
  • the outer tube 51 is shown here as a single cylinder with both ends covered with closing plates 51c and 51d, the cross-sectional shape of the outer tube 51 does not have to be circular, and may be rectangular or rectangular. It may be oval. Further, the outer tube 51 does not need to be formed from one cylindrical component.
  • the outer tube 51 is divided into two parts, for example, an upper half into which the flat tube 37 is inserted and an opposite (i.e., lower) half, and by joining the upper and lower parts, the outer tube 51 may be formed. The same applies to the outer tube 53, outer tube 57, and outer tube 61 described below.
  • a folded header 34 is provided above the tube end 37b of the flat tube 37 of the heat exchanger 33A and above the tube end 37b of the flat tube 37 of the heat exchanger 33B.
  • the heat exchange body 33A is connected to the heat exchange body 33B via the folded header 34.
  • the folded header 34 allows the refrigerant flowing from the plurality of flat tubes 37 of the heat exchanger 33A to flow out into the plurality of flat tubes 37 of the heat exchanger 33B, thereby controlling the flow of the refrigerant from the bottom to the top. It has the function of turning the flow downward. Specifically, the refrigerant flows from the bottom to the top in the Z direction in the plurality of flat tubes 37 included in the heat exchange body 33A.
  • the refrigerant flows from above to below in the Z direction in the plurality of flat tubes 37 included in the heat exchange body 33B.
  • the direction in which the refrigerant flows is switched by the folded header 34.
  • the flat tube 37 does not need to be divided into an upwind side and a leeward side, and may be composed of a single flat tube. The case where the flat tube 37 is composed of one flat tube will be described later in Embodiment 2 using FIG. 19.
  • a refrigerant distributor 32 is provided below the lower tube ends 37a of the plurality of flat tubes 37 included in the heat exchanger 33B.
  • the refrigerant distributor 32 includes an outer pipe 53, an inner pipe 54, and a connecting pipe 56.
  • the refrigerant distributor 32 has a double pipe structure.
  • the outer tube 53 is composed of a circular tube, and the tube axis direction is the X direction.
  • a plurality of flat tube insertion holes 53e are provided in the upper surface of the outer tube 53.
  • the plurality of flat tube insertion holes 53e are arranged side by side in the X direction at intervals.
  • the plurality of flat tube insertion holes 53e are through holes that penetrate the upper surface of the outer tube 53.
  • each flat tube 37 is directly inserted into the flat tube insertion hole 53e of the outer tube 53.
  • a closing plate 53c is provided on the tube end 53a side
  • a closing plate 53d is provided on the tube end 53b side.
  • the tube ends 53a and 53b are closed by closing plates 53c and 53d, respectively, and are not open.
  • the connecting pipe 56 is connected to the outer pipe 53, as shown in FIG.
  • the tube axis direction of the connecting tube 56 is the Z direction.
  • a lower end portion 56a of the connecting tube 56 is inserted into the outer tube 53.
  • the internal space of the connecting tube 56 and the first internal space 53g which is the internal space on the tube end 53a side of the outer tube 53, communicate with each other.
  • the cross-sectional shape of the first internal space 53g is circular.
  • the refrigerant distributor 32 is connected to the refrigerant pipe 36, as shown in FIG. Specifically, the outer pipe 53 of the refrigerant distributor 32 is connected to the refrigerant pipe 36 via a connecting pipe 56.
  • the refrigerant distributor 32 has a double pipe structure, and an inner pipe 54 is arranged inside the outer pipe 53. There is a gap between the inner wall 53f of the outer tube 53 and the outer wall 54f of the inner tube 54, and the gap forms a second internal space 53h of the outer tube 53.
  • the cross-sectional shape of the second internal space 53h is donut-shaped (that is, annular).
  • the inner tube 54 includes a plurality of refrigerant outlet holes 54c arranged in parallel on the side surface.
  • the inner tube 54 is joined to the outer tube 53 via a partition plate 55.
  • the partition plate 55 is arranged between the first internal space 53g of the outer tube 53 and the closing plate 53d.
  • the partition plate 55 divides the first internal space 53g and the second internal space 53h.
  • a through hole 55a is formed in the center of the partition plate 55.
  • the tube end 54a is fitted into the through hole 55a.
  • the tube end portion 54a opens toward the first internal space 53g. Therefore, the first internal space 53g and the internal space of the inner tube 54 are in communication with each other.
  • the tube end portion 54b of the inner tube 54 is joined to the closing plate 53d, and is in a closed state.
  • the outer peripheral portion of the partition plate 55 is joined to the inner wall 53f of the outer tube 53.
  • the partition plate 55 is joined to the inner wall 53f of the outer tube 53 and the outer wall 54f of the inner tube 54, as described above.
  • the refrigerant flowing inside the refrigerant distributor 32 flows between the first internal space 53g on the side of the pipe end 53a to which the connecting pipe 56 is connected and the closing plate 53d on the side of the opposite pipe end 53b. It is possible to pass between them only via the interior space of the inner tube 54.
  • the outdoor heat exchanger 4 includes a refrigerant distributor 41, a refrigerant distributor 42, a plurality of heat exchangers 43, and a folded header 44.
  • a refrigerant pipe 36 is connected to the refrigerant distributor 41, and a refrigerant pipe 45 is connected to the refrigerant distributor 42.
  • the plurality of heat exchange bodies 43 include a heat exchange body 43A and a heat exchange body 43B.
  • the heat exchange body 43A and the heat exchange body 43B are arranged side by side in the airflow direction and face each other.
  • the heat exchanger 43A and the heat exchanger 43B are arranged in two layers in a direction along the direction of the wind generated by the outdoor blower 9.
  • the heat exchange body 43 disposed on the windward side will be referred to as a heat exchange body 43B
  • the heat exchange body 43 disposed on the leeward side will be referred to as a heat exchange body 43A. Since the configurations of the heat exchange body 43A and the heat exchange body 43B are basically the same, they will be collectively described as the heat exchange body 43 below.
  • the heat exchange body 43 is composed of a plurality of flat tubes 47 and a plurality of fins 48.
  • the plurality of flat tubes 47 are arranged in parallel in the horizontal direction (that is, in the X direction) at intervals from each other. Thereby, the wind generated by the outdoor blower 9 flows between adjacent flat tubes 47 in the direction of the white arrow in FIG.
  • the tube axis direction of the plurality of flat tubes 47 is the Z direction.
  • the refrigerant flows in the Z direction within the flat tube 47. As the refrigerant flows through the flat tube 47, heat exchange is performed between the refrigerant and the air.
  • the fins 48 are arranged between adjacent flat tubes 47 in the X direction.
  • the fins 48 are joined to the side surfaces of the adjacent flat tubes 47 and conduct heat to the flat tubes 47 .
  • the fins 48 improve the heat exchange efficiency between the air and the refrigerant, and for example, corrugated fins are used.
  • the fins 48 are not limited to corrugated fins, and may be flat fins, for example.
  • the fins 48 do not necessarily need to be provided.
  • the same fins 48 may be shared between the plurality of heat exchangers 43.
  • FIG. 7 is a sectional view showing the configuration of the refrigerant distributor 41 provided in the outdoor heat exchanger 4 shown in FIG. 4.
  • FIG. 8 is a sectional view showing the configuration of the refrigerant distributor 42 provided in the outdoor heat exchanger 4 shown in FIG. 4.
  • a refrigerant distributor 41 is provided below the lower tube end 47a of the tube ends 47a and 47b of the plurality of flat tubes 47 included in the heat exchanger 43A.
  • the refrigerant distributor 41 is composed of an outer pipe 57, an inner pipe 58, and a connecting pipe 60, as shown in FIG.
  • the refrigerant distributor 41 has a double pipe structure.
  • the outer tube 57 is composed of a circular tube, and the tube axis direction is the X direction.
  • a plurality of flat tube insertion holes 57e are provided in the upper surface of the outer tube 57.
  • the plurality of flat tube insertion holes 57e are arranged side by side in the X direction at intervals from each other.
  • the plurality of flat tube insertion holes 57e are through holes that penetrate the upper surface of the outer tube 57.
  • the tube end portion 47a of each flat tube 47 is directly inserted into the flat tube insertion hole 57e of the outer tube 57.
  • a closing plate 57c is provided on the tube end 57a side
  • a closing plate 57d is provided on the tube end 57b side.
  • the tube ends 57a and 57b are closed by closing plates 57c and 57d, respectively, and are not open.
  • the connecting tube 60 is connected to the outer tube 57, as shown in FIG.
  • the tube axis direction of the connecting tube 60 is the Z direction.
  • a lower end 60a of the connecting tube 60 is inserted into the outer tube 57.
  • the internal space of the connecting tube 60 and the first internal space 57g which is the internal space on the tube end 57a side of the outer tube 57, communicate with each other.
  • the cross-sectional shape of the first internal space 57g is circular.
  • the refrigerant distributor 41 is connected to the refrigerant pipe 36, as shown in FIG. Specifically, the outer pipe 57 of the refrigerant distributor 41 is connected to the refrigerant pipe 36 via the connecting pipe 60.
  • the refrigerant distributor 41 has a double pipe structure, and an inner pipe 58 is arranged inside the outer pipe 57. There is a gap between the inner wall 57f of the outer tube 57 and the outer wall 58f of the inner tube 58, and the gap forms a second internal space 57h of the outer tube 57.
  • the cross-sectional shape of the second internal space 57h is donut-shaped (that is, annular).
  • the inner tube 58 includes a plurality of refrigerant outlet holes 58c arranged in parallel on the side surface.
  • the inner diameter of the coolant outlet hole 58c may be the same as or different from the inner diameter of the coolant outlet hole 54c shown in FIG. 6 and the inner diameter of the coolant outlet hole 62c shown in FIG. 8.
  • the inner tube 58 is joined to the outer tube 57 via a partition plate 59.
  • the partition plate 59 is arranged between the first internal space 57g of the outer tube 57 and the closing plate 57d.
  • the partition plate 59 divides the first internal space 57g and the second internal space 57h.
  • a through hole 59a is formed in the center of the partition plate 59.
  • the tube end 58a is fitted into the through hole 59a.
  • the tube end portion 58a opens toward the first internal space 57g. Therefore, the first internal space 57g and the internal space of the inner tube 58 are in communication with each other.
  • the tube end portion 58b of the inner tube 58 is joined to the closing plate 57d, and is in a closed state.
  • the outer peripheral portion of the partition plate 59 is joined to the inner wall 57f of the outer tube 57.
  • the partition plate 59 is joined to the inner wall 57f of the outer tube 57 and the outer wall 58f of the inner tube 58, as described above. Therefore, the refrigerant flowing inside the refrigerant distributor 41 flows between the first internal space 57g on the side of the pipe end 57a to which the connecting pipe 60 is connected and the closing plate 57d on the side of the opposite pipe end 58b. It is possible to pass between them only via the interior space of the inner tube 58.
  • a folded header 44 is provided above the upper tube end 47b of the flat tube 47 of the heat exchanger 43A and above the upper tube end 47b of the flat tube 47 of the heat exchanger 43B.
  • the heat exchange body 43A is connected to the heat exchange body 43B via the folded header 44.
  • the folded header 44 allows the refrigerant flowing from the plurality of flat tubes 47 of the heat exchanger 43A to flow out into the plurality of flat tubes 47 of the heat exchanger 43B, thereby controlling the flow of the refrigerant from the bottom to the top. It has the function of turning the flow downward. Specifically, the refrigerant flows from the bottom to the top in the Z direction in the plurality of flat tubes 47 included in the heat exchange body 43A.
  • the refrigerant flows from above to below in the Z direction in the plurality of flat tubes 47 included in the heat exchange body 43B.
  • the direction in which the refrigerant flows is switched by the folded header 44.
  • the flat tube 47 does not need to be divided into an upwind side and a leeward side, and may be composed of a single flat tube. The case where the flat tube 47 is composed of one flat tube will be described later in Embodiment 2 using FIG. 19.
  • a refrigerant distributor 42 is provided below the lower tube end 47a of the tube ends 47a and 47b of the plurality of flat tubes 47 included in the heat exchanger 43B.
  • the refrigerant distributor 42 is composed of an outer pipe 61, an inner pipe 62, and a connecting pipe 64, as shown in FIG.
  • the refrigerant distributor 42 has a double pipe structure.
  • the outer tube 61 is composed of a circular tube, and the tube axis direction is the X direction.
  • a plurality of flat tube insertion holes 61e are provided in the upper surface of the outer tube 61.
  • the plurality of flat tube insertion holes 61e are arranged side by side in the X direction at intervals from each other.
  • the plurality of flat tube insertion holes 61e are through holes that penetrate the upper surface of the outer tube 61.
  • the tube end portion 47a of each flat tube 47 is directly inserted into the flat tube insertion hole 61e of the outer tube 61.
  • a closing plate 61c is provided on the tube end 61a side
  • a closing plate 61d is provided on the tube end 61b side.
  • the tube ends 61a and 61b are closed by closing plates 61c and 61d, respectively, and are not open.
  • the connecting tube 64 is connected to the outer tube 61, as shown in FIG.
  • the tube axis direction of the connecting tube 64 is the Z direction.
  • a lower end 64a of the connecting tube 64 is inserted into the outer tube 61.
  • the internal space of the connecting tube 64 and the first internal space 61g which is the internal space on the tube end 61a side of the outer tube 61, communicate with each other.
  • the cross-sectional shape of the first internal space 61g is circular.
  • the refrigerant distributor 42 is connected to the refrigerant pipe 45, as shown in FIG. Specifically, the outer pipe 61 of the refrigerant distributor 42 is connected to the refrigerant pipe 45 via the connecting pipe 64.
  • the refrigerant distributor 42 has a double pipe structure, and an inner pipe 62 is arranged inside the outer pipe 61. There is a gap between the inner wall 61f of the outer tube 61 and the outer wall 62f of the inner tube 62, and the gap forms a second internal space 61h of the outer tube 61.
  • the cross-sectional shape of the second internal space 61h is donut-shaped (that is, annular).
  • the inner tube 62 includes a plurality of refrigerant outlet holes 62c arranged in parallel on the side surface.
  • the inner tube 62 is joined to the outer tube 61 via a partition plate 63.
  • the partition plate 63 is arranged between the first internal space 61g of the outer tube 61 and the closing plate 61d.
  • the partition plate 63 divides the first internal space 61g and the second internal space 61h.
  • a through hole 63a is formed in the center of the partition plate 63.
  • the tube end 62a is fitted into the through hole 63a.
  • the tube end portion 62a opens toward the first internal space 61g. Therefore, the first internal space 61g and the internal space of the inner tube 62 are in communication with each other. Further, the tube end portion 62b of the inner tube 62 is joined to the closing plate 61d, and is in a closed state.
  • the outer peripheral portion of the partition plate 63 is joined to the inner wall 61f of the outer tube 61.
  • the partition plate 63 is joined to the inner wall 61f of the outer tube 61 and the outer wall 62f of the inner tube 62, as described above. Therefore, the refrigerant flowing inside the refrigerant distributor 42 flows between the first internal space 61g on the side of the pipe end 61a to which the connecting pipe 64 is connected and the closing plate 61d on the side of the opposite pipe end 61b. It is possible to pass between them only through the interior space of the inner tube 62.
  • the configurations of the refrigerant distributors 41 and 42 are similar to the refrigerant distributor 32 shown in FIG. It consists of tubes 60 and 64.
  • a refrigerant pipe 36 is connected to the refrigerant distributor 41 via a connecting pipe 60, and a refrigerant pipe 45 is connected to the refrigerant distributor 42 via a connecting pipe 64.
  • the outdoor heat exchanger 4 is sometimes called a "heat exchanger".
  • the heat exchange body 43 is sometimes referred to as a "first heat exchange body.”
  • the flat tube 47 is sometimes called a "first flat tube.”
  • the flat tube 47 connected to the refrigerant distributor 41 is sometimes referred to as a "first flat tube on the leeward side”
  • the flat tube 47 connected to the refrigerant distributor 42 is sometimes referred to as a "first flat tube on the windward side”.
  • Refrigerant distributor 41 may be referred to as a "first refrigerant distributor,” and refrigerant distributor 42 may be referred to as a “second refrigerant distributor.”
  • the outer tube 57 is referred to as a “first outer tube”
  • the inner tube 58 is referred to as a “first inner tube”
  • the refrigerant outlet hole 58c is referred to as a “first refrigerant outlet hole”
  • the partition plate 59 is referred to as a "first partition plate.”
  • the outer tube 61 is referred to as a "second outer tube”
  • the inner tube 62 is referred to as a “second inner tube”
  • the refrigerant outlet hole 62c is referred to as a “second refrigerant outlet hole”
  • the partition plate 63 is referred to as a “second partition plate.”
  • the wrap header 44 is sometimes referred to as a "first wrap header.”
  • the tube end 47a of the flat tube 47 inserted into the refrigerant distributor 41 is sometimes referred to as "one end of the first flat tube”
  • the tube end 47a of the flat tube 47 inserted into the refrigerant distributor 42 is referred to as "one end of the first flat tube”. is sometimes referred to as "the other end of the first flat tube.”
  • the outdoor heat exchanger 3 is sometimes called a "second heat exchanger".
  • the heat exchange body 33 is sometimes referred to as a "second heat exchange body.”
  • the flat tube 37 is sometimes called a "second flat tube.”
  • the flat tube 37 connected to the refrigerant distributor 31 is sometimes referred to as a "second flat tube on the leeward side”
  • the flat tube 37 connected to the refrigerant distributor 32 is sometimes referred to as a "second flat tube on the windward side”.
  • the refrigerant distributor 31 is sometimes called a "third refrigerant distributor,” and the refrigerant distributor 32 is sometimes called a "fourth refrigerant distributor.”
  • the outer tube 51 is sometimes referred to as a "third outer tube.”
  • the outer pipe 53 is sometimes called a "fourth outer pipe”
  • the inner pipe 54 is sometimes called a “fourth inner pipe”
  • the refrigerant outlet hole 54c is sometimes called a “fourth refrigerant outlet hole”
  • the partition plate 55 is sometimes called a "fourth partition plate.” .
  • wrap header 34 is sometimes referred to as a "second wrap header.”
  • the tube end 37a of the flat tube 37 inserted into the refrigerant distributor 31 is sometimes referred to as "one end of the second flat tube”
  • the tube end 37a of the flat tube 37 inserted into the refrigerant distributor 32 is sometimes referred to as "one end of the second flat tube”. is sometimes referred to as "the other end of the second flat tube”.
  • FIG. 2 is a perspective view showing the connection state between the outdoor heat exchanger 3 and the outdoor heat exchanger 4 in the cooling operation state and the flow of refrigerant.
  • the connection pipe 52, the connection pipe 56, the connection pipe 60, and the connection pipe 64 the connection pipe 56 and The pipe 60 is connected to the refrigerant pipe 36 .
  • the refrigerant flowing from the refrigerant pipe 35 connected to the connecting pipe 52 is partially condensed in the outdoor heat exchanger 3 to become a gas-liquid two-phase state, and flows out into the refrigerant pipe 36 . Thereafter, the refrigerant flows into the outdoor heat exchanger 4 in a gas-liquid two-phase state.
  • the refrigerant first flows into the refrigerant distributor 41.
  • the refrigerant distributor 41 has a double pipe structure, and the inner pipe 58 thereof has a large number of refrigerant outlet holes 58c arranged in parallel.
  • the refrigerant that has flowed into the refrigerant distributor 41 flows out from the refrigerant outlet hole 58c into the second internal space 57h when passing through the interior of the inner tube 58. Thereafter, it is distributed to each flat tube 47 from the second internal space 57h. In this way, by providing the refrigerant outlet hole 58c in the inner tube 58, the refrigerant is evenly distributed to each flat tube 47 of the heat exchanger 43A.
  • the refrigerant condensed inside the heat exchanger 43A and the heat exchanger 43B flows out into the refrigerant pipe 45 through the refrigerant distributor 42.
  • the refrigerant distributor 41 on the inflow side of the outdoor heat exchanger 4 located on the downstream side among the plurality of outdoor heat exchangers 3 and outdoor heat exchangers 4 forming serial refrigerant flow paths during cooling operation. has a double tube structure.
  • the inner pipe 58 of the refrigerant distributor 41 has a large number of refrigerant outlet holes 58c arranged in parallel. Thereby, in the outdoor heat exchanger 4 located on the downstream side, it is possible to improve the uniformity of distribution of the gas-liquid two-phase refrigerant to the heat exchanger 43A.
  • the refrigerant distributor 41 the refrigerant flows into the first internal space 57g of the outer tube 57 via the connecting pipe 60. Thereafter, the refrigerant once enters the inner tube 58 from the first inner space 57g, and flows out from the inner tube 58's many juxtaposed refrigerant outlet holes 58c to the second inner space 57h of the outer tube 57. do. At this time, in the outer tube 57, the second internal space 57h is separated from the first internal space 57g by a partition plate 59.
  • the refrigerant that has flowed into the second internal space 57h of the outer tube 57 does not flow into the first internal space 57g, but instead passes through the flat tube insertion holes 57e into the plurality of flat tubes connected to the outer tube 57. It flows out into pipe 47.
  • FIG. 10 is a diagram schematically showing a refrigerant distribution operation in the refrigerant distributor 31 provided in the refrigeration cycle device 100 according to the first embodiment.
  • FIG. 11 is a diagram schematically showing a refrigerant distribution operation in the refrigerant distributors 32, 41, and 42 provided in the refrigeration cycle device 100 according to the first embodiment.
  • FIG. 10 and FIG. 11 in order to make it easy to understand, the case where the refrigerant outflow holes 54c, 58c, and 62c are opened directly downward is illustrated.
  • the refrigerant flows in from one location (i.e., the connecting pipe 52) and flows out from multiple locations (i.e., the flat tube insertion hole 51e). Therefore, there is a strong tendency for a large amount of the refrigerant to flow out from the flat tube insertion hole 51e located close to the connecting tube 52.
  • the refrigerant flows from multiple locations (i.e., refrigerant outlet holes 54c, 58c, 62c of the inner pipes 54, 58, 62) to the outer pipes 53, 57, 61 and flows out from multiple locations (ie, flat tube insertion holes 53e, 57e, and 61e). Therefore, even if the outflow from the inner tubes 54, 58, 62 is uneven, the uniformity of refrigerant distribution is improved compared to the case where the inner tubes 54, 58, 62 are not provided.
  • FIG. 12 is a diagram schematically showing the state of liquid refrigerant in the refrigerant distributor 31 provided in the refrigeration cycle device 100 according to the first embodiment.
  • FIG. 13 is a diagram schematically showing the state of liquid refrigerant in the refrigerant distributors 32, 41, and 42 provided in the refrigeration cycle device 100 according to the first embodiment.
  • the refrigerant outflow holes 54c, 58c, and 62c are opened directly downward is illustrated.
  • FIG. 12 and 13 show a case where gas-liquid two-phase refrigerant flows into the refrigerant distributors 31, 32, 41, and 42.
  • liquid refrigerant may accumulate under the outer tube 51, reducing the amount of refrigerant circulating in the refrigerant circuit.
  • the refrigerant is spouted from a plurality of refrigerant outlet holes 54c, 58c, and 62c provided in the inner pipes 54, 58, and 62.
  • FIGS. 12 and 13 show the case of separate flows in which the gas refrigerant and the liquid refrigerant flow separately, the way the refrigerant flows is not limited to the examples in FIGS. 12 and 13.
  • Another example of the flow of the refrigerant inside the refrigerant distributors 31, 32, 41, 42 is, for example, an annular flow.
  • the liquid refrigerant is annular and the annular liquid refrigerant flow covers the gas refrigerant.
  • the refrigerant that flows out from the refrigerant outlet holes 54c, 58c, and 62c provided in the inner tubes 54, 58, and 62 is mainly a gas refrigerant or a liquid refrigerant. Which refrigerant mainly flows out from the refrigerant outlet holes 54c, 58c, and 62c varies depending on the state of the refrigerant flowing inside the inner pipes 54, 58, and 62, and the arrangement and position of the refrigerant outlet holes 54c, 58c, and 62c. do.
  • the liquid refrigerant covers the refrigerant outflow holes 54c, 58c, and 62c, so that the liquid refrigerant mainly flows out from the refrigerant outflow holes 54c, 58c, and 62c.
  • the determination is made depending on whether the refrigerant outlet holes 54c, 58c, and 62c open upward or downward. That is, in the case of separated flows, when the refrigerant outflow holes 54c, 58c, and 62c are open upward, the gas refrigerant mainly flows out from the refrigerant outflow holes 54c, 58c, and 62c.
  • liquid refrigerant mainly flows out from the refrigerant outflow holes 54c, 58c, and 62c.
  • the refrigerant flowing out from each refrigerant outlet hole 54c, 58c, 62c may be gas refrigerant.
  • the liquid refrigerant changes. Even in the case of an annular flow, the liquid refrigerant mainly flows out closer to the inlet side of the inner pipes 54, 58, 62.
  • gas refrigerant becomes the main flow toward the back of the inner pipes 54, 58, and 62.
  • the gas refrigerant mainly flows out from the refrigerant outlet holes 54c, 58c, and 62c.
  • FIG. 9 is a perspective view showing the connection state of the outdoor heat exchanger 3 and the outdoor heat exchanger 4 in the heating operation state in the refrigeration cycle device 100 according to the first embodiment.
  • the refrigerant flow path connecting the outdoor heat exchanger 3 and the outdoor heat exchanger 4 is expressed by a simple connection using refrigerant piping.
  • solid arrows indicate the direction in which the refrigerant flows
  • white arrows indicate the direction of the wind generated by the outdoor blower 9.
  • the direction in which the refrigerant flows in the heating operation state is opposite to that in the cooling operation.
  • refrigerant flows into the outdoor heat exchanger 3 and the outdoor heat exchanger 4 through the refrigerant distributor 32 and the refrigerant distributor 42 .
  • Both the refrigerant distributor 32 and the refrigerant distributor 42 are refrigerant distributors having a double pipe structure.
  • the refrigerant flows into the first internal space 53g of the outer tube 53 via the connecting pipe 56. Thereafter, the refrigerant once enters the inner tube 54 from the first inner space 53g, and flows out from the inner tube 54's many juxtaposed refrigerant outlet holes 54c to the second inner space 53h of the outer tube 53. do.
  • the second internal space 53h is separated from the first internal space 53g by a partition plate 55. Therefore, the refrigerant that has flowed into the second internal space 53h of the outer tube 53 does not flow into the first internal space 53g, but instead passes through the flat tube insertion holes 53e into the plurality of flat tubes connected to the outer tube 53. It flows out into pipe 37.
  • the refrigerant distributor 42 the refrigerant flows into the first internal space 61g of the outer tube 61 via the connecting pipe 64. Thereafter, the refrigerant once enters the inner tube 62 from the first inner space 61g, and flows out from the inner tube 62's many juxtaposed refrigerant outlet holes 62c to the second inner space 61h of the outer tube 61. do. At this time, in the outer tube 61, the second internal space 61h is separated from the first internal space 61g by a partition plate 63.
  • the refrigerant that has flowed into the second internal space 61h of the outer tube 61 does not flow into the first internal space 61g, but instead passes through the flat tube insertion holes 53e into the plurality of flat tubes connected to the outer tube 61. It flows out into pipe 47.
  • the refrigerant distributor 31 When the refrigerant flows out from the outdoor heat exchanger 3 and the outdoor heat exchanger 4 during the heating operation state, it passes through the refrigerant distributor 31 and the refrigerant distributor 41. While the refrigerant distributor 31 is a refrigerant distributor having a single pipe structure, the refrigerant distributor 41 is a refrigerant distributor having a double pipe structure. The refrigerant flowing into the refrigerant distributor 31 from the flat tube 37 passes through the inside of the outer tube 51 and flows out via the connecting tube 52.
  • the refrigerant that has flowed into the refrigerant distributor 41 from the flat tube 47 first flows into the second internal space 61h of the outer tube 57, and then flows into the inner tube 58 from the refrigerant outlet hole 58c. Then, the refrigerant passes through the inside of the inner tube 58 and flows out from the inner tube 58 into the first internal space 57g partitioned by the partition plate 59. The refrigerant flows out of the refrigerant distributor 41 from the first internal space 57g via the connecting pipe 60.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 function as an evaporator.
  • the refrigerant distributor 41 provided on the outflow side of the outdoor heat exchanger 4 is configured with a double pipe, and has a large number of refrigerant outflow holes 58c arranged in parallel in the inner pipe 58. There is. Therefore, compared to the case where a refrigerant distributor 41 with a single-pipe structure is used as the refrigerant distributor 41, in the case of a refrigerant distributor 41 with a double-pipe structure, the pressure loss in the refrigerant flow path becomes higher, and the pressure loss of the compressor 1 increases. The pressure on the suction side decreases. This causes a problem in that the required amount of work of the compressor 1 increases and the performance of the refrigeration cycle device decreases.
  • the specifications of the refrigerant distributor 41 and the refrigerant distributor 42 included in the outdoor heat exchanger 4 are set such that the uniformity of refrigerant distribution in the cooling operation state and the uniformity of refrigerant distribution in the outdoor heat exchanger 4 in the heating operation state are determined. It is desirable to determine the balance by taking into account the pressure loss that occurs. In other words, part or all of the specifications in the refrigerant distributor 41 are the same as those in the refrigerant distributor 42 so that pressure loss can be suppressed in the heating operation state while ensuring uniformity of the refrigerant in the cooling operation state. Some or all of them may be designed differently.
  • Candidates for specifications of the refrigerant distributor 41 and the refrigerant distributor 42 to be changed here include the following items. - Diameter of refrigerant outlet holes 58c and 62c (i.e. hole diameter) - Arrangement interval of refrigerant outlet holes 58c and 62c - Arrangement position of refrigerant outlet holes 58c and 62c - Number of refrigerant outlet holes 58c and 62c - Diameter (inner diameter or outer diameter) of inner pipes 58 and 62 - Diameter of outer tubes 57 and 61 (inner diameter or outer diameter)
  • the refrigerant distributor 41 and the refrigerant distributor 42 When changing the specifications of the refrigerant distributor 41 and the refrigerant distributor 42, it is desirable to make decisions as appropriate based on data from simulations, prototype experiments, etc. Specifically, by increasing the diameter or number of the refrigerant outlet holes 58c and 62c, an increase in pressure loss can be suppressed and the refrigerant distribution characteristics change. In accordance with the changed characteristics, the spacing or position of the refrigerant outlet holes 58c and 62c is changed to suppress deterioration in uniformity of distribution during cooling operation. Furthermore, increasing the diameters of the inner tube 58 and the inner tube 62 and the diameters of the outer tube 57 and the outer tube 61 contributes to suppressing pressure loss. In this way, the specifications of the refrigerant distributor 41 and the refrigerant distributor 42 are convenient specifications considering the balance between the uniformity of refrigerant distribution in the cooling operation state and the pressure loss in the heating operation state. It is desirable to make adjustments accordingly.
  • the specifications of the refrigerant distributor 41 and the specifications of the refrigerant distributor 42 are related to the uniformity of refrigerant distribution when the outdoor heat exchangers 3 and 4 function as condensers, and the conditions regarding the uniformity of refrigerant distribution when the outdoor heat exchangers 3 and 4 function as condensers. It is determined based on the pressure loss that occurs when 4 functions as an evaporator.
  • part or all of the specifications of the refrigerant distributor 41 or 42 may be designed to be different from part or all of the specifications of the refrigerant distributor 32 of the outdoor heat exchanger 3.
  • the refrigerant distributor 41 and the refrigerant distributor 42 are arranged so that the total pressure loss of the refrigerant distributor 41 and the refrigerant distributor 42 is smaller than that of the refrigerant distributor 32 that the outdoor heat exchanger 3 has.
  • the above specifications may be changed.
  • the refrigerant distributor 42 on the inflow side of the outdoor heat exchanger 4 located on the upstream side and the refrigerant distributor 32 on the inflow side of the outdoor heat exchanger 3 located on the downstream side have a double pipe structure.
  • the inner pipe 62 of the refrigerant distributor 42 and the inner pipe 54 of the refrigerant distributor 32 each have a large number of refrigerant outflow holes 62c and refrigerant outflow holes 54c arranged in parallel.
  • the refrigerant in the gas-liquid two-phase state is evenly distributed to the heat exchanger 43B and the heat exchanger 33B. can improve sex.
  • FIG. 14 is a refrigerant circuit diagram showing the configuration of refrigeration cycle device 100 according to Modification 1 of Embodiment 1.
  • FIG. 14 shows the flow of refrigerant when the refrigeration cycle device 100 according to Modification Example 1 is in a cooling operation state.
  • FIG. 15 is a refrigerant circuit diagram showing the configuration of refrigeration cycle device 100 according to Modification 1 of Embodiment 1.
  • FIG. 15 shows the flow of refrigerant when the refrigeration cycle device 100 according to Modification 1 is in a heating operation state.
  • the compressed refrigerant becomes a gas refrigerant and is discharged from the compressor 1, flows out from the outdoor unit 101 via the four-way valve 2 and the refrigerant pipe 305, and flows into the indoor unit 201.
  • the refrigerant is condensed in the indoor heat exchanger 21 and supplies heat to the air.
  • the refrigerant then flows into the outdoor unit 101 after flowing out of the indoor unit 201.
  • the refrigerant branches into a refrigerant pipe 302 and a refrigerant pipe 304, and flows into the expansion valve 5 and the expansion valve 6, respectively.
  • the refrigerant that has been depressurized and expanded by the expansion valves 5 and 6 flows into the outdoor heat exchanger 3 and the outdoor heat exchanger 4, respectively, and evaporates.
  • the refrigerant flowing out from the outdoor heat exchanger 4 passes through the electromagnetic valve 8 and joins with the refrigerant flowing out from the outdoor heat exchanger 3.
  • the combined refrigerant flows into the accumulator 10 via the four-way valve 2 and the refrigerant pipe 306. It is sucked into the compressor 1 again from the accumulator 10 and circulates through the refrigerant circuit. This results in a refrigerant circuit having a refrigerant flow path in which the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are connected in parallel.
  • the two outdoor heat exchangers 3 and 4 are connected in parallel during heating operation. Therefore, even if outdoor heat exchangers with similar specifications are used as the two outdoor heat exchangers 3 and 4, due to the difference in pressure loss due to the difference in the refrigerant distributors 32 and 42, the two outdoor heat exchangers 3 and 4 There is a possibility that the distribution of refrigerant to 4 may be biased. In that case, the uniformity of distribution to the outdoor heat exchangers 3 and 4 can be improved by adjusting the opening degrees of the expansion valves 5 and 6 by the control unit 11.
  • the opening degree of the expansion valve 5 or 6 on the side where more refrigerant flows is reduced, and the opening degree of the expansion valve 5 or 6 on the side where refrigerant is less likely to flow is reduced. Increase the opening.
  • Embodiment 2 By the way, in the above description of Embodiment 1, the case where the number of outdoor heat exchangers is two was described, but even if the number of outdoor heat exchangers is three or more, the structure of Embodiment 1 can be applied. is applicable. Specifically, when n outdoor heat exchangers can form a series refrigerant flow path by controlling the refrigerant circuit, the outdoor heat exchanger 3 and the upstream outdoor heat exchanger when functioning as a condenser are Using a similar configuration, a configuration similar to that of the outdoor heat exchanger 4 is used for the outdoor heat exchanger on the downstream side. It goes without saying that this provides the same effects as in the first embodiment.
  • n is a natural number of 3 or more.
  • FIG. 16 is a refrigerant circuit diagram showing the configuration of a refrigeration cycle device 100 according to a second modification of the first embodiment.
  • FIG. 17 is a diagram showing the flow of refrigerant when the refrigeration cycle device 100 according to the second modification of the first embodiment is in a cooling operation state.
  • FIG. 18 shows the flow of refrigerant when the refrigeration cycle device 100 according to the second modification of the first embodiment is in a heating operation state.
  • FIG. 16 The difference between the configuration in FIG. 16 and the configuration in FIG. 1 is that in FIG. 16, two outdoor heat exchangers 3A and 3B are provided instead of the outdoor heat exchanger 3 in FIG. Two outdoor heat exchangers 3A and 3B are connected in parallel. Both outdoor heat exchangers 3A and 3B have the same configuration as outdoor heat exchanger 3 in FIG. 1. Since the other configurations are the same as those in FIG. 1, their explanation will be omitted here.
  • control unit 11 controls the expansion valve 5 to be in a fully closed state, the solenoid valve 7 to be in an open state, the solenoid valve 8 to be in a closed state, and the expansion valve 6 to be in a fully open state.
  • the gas refrigerant discharged from the compressor 1 flows into the refrigerant distributor 31 of the outdoor heat exchangers 3A and 3B.
  • the gas refrigerant exchanges heat with air in the outdoor heat exchangers 3A and 3B, and a part of the gas refrigerant condenses to become a gas-liquid two-phase state.
  • the gas-liquid two-phase refrigerant flowing out from the outdoor heat exchanger 3A and the gas-liquid two-phase refrigerant flowing out from the outdoor heat exchanger 3B join on the upstream side of the solenoid valve 7.
  • the combined refrigerant then flows into the refrigerant distributor 41 of the outdoor heat exchanger 4 via the solenoid valve 7. As described using FIG.
  • the refrigerant distributor 41 has a double pipe structure, and the inner pipe 58 has a large number of refrigerant outlet holes 58c arranged in parallel.
  • the refrigerant that has flowed into the refrigerant distributor 41 flows out from the refrigerant outlet hole 58c into the second internal space 57h when passing through the interior of the inner tube 58.
  • the refrigerant is evenly distributed to each flat tube 47 of the heat exchanger 43A.
  • the refrigerant condensed inside the heat exchanger 43A and the heat exchanger 43B flows out into the refrigerant pipe 45 through the refrigerant distributor 42.
  • the refrigerant that has flowed out of the outdoor heat exchanger 4 flows into the indoor heat exchanger 21.
  • the refrigerant exchanges heat with air and evaporates. Thereafter, the refrigerant flows out of the indoor unit 201 and flows into the outdoor unit 101.
  • the refrigerant flows into the accumulator 10 via the four-way valve 2 and the refrigerant pipe 306. It is sucked into the compressor 1 again from the accumulator 10 and circulates through the refrigerant circuit.
  • the outdoor heat exchanger located on the downstream side has a double pipe structure.
  • the inner pipe 58 of the refrigerant distributor 41 has a large number of refrigerant outlet holes 58c arranged in parallel.
  • the refrigerant In the indoor unit 201, the refrigerant is condensed in the indoor heat exchanger 21 and supplies heat to the air. The refrigerant then flows into the outdoor unit 101 after flowing out of the indoor unit 201. In the outdoor unit 101, the refrigerant branches into a refrigerant pipe 302 and a refrigerant pipe 304, and flows into the expansion valve 5 and the expansion valve 6, respectively. The refrigerant that has been depressurized and expanded by the expansion valves 5 and 6 flows into the outdoor heat exchangers 3A, 3B and the outdoor heat exchanger 4, respectively, and evaporates.
  • the refrigerant flowing out from the outdoor heat exchanger 4 passes through the solenoid valve 8 and joins with the refrigerant flowing out from the outdoor heat exchangers 3A and 3B. Thereafter, the combined refrigerant flows into the accumulator 10 via the four-way valve 2 and the refrigerant pipe 306. It is sucked into the compressor 1 again from the accumulator 10 and circulates through the refrigerant circuit. This results in a refrigerant circuit having a refrigerant flow path in which the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are connected in parallel.
  • the downstream outdoor heat exchanger When multiple outdoor heat exchangers are connected in series to function as condensers during cooling operation, the downstream outdoor heat exchanger will contain a mixture of gas and liquid refrigerants. Refrigerant may be introduced in a two-phase state.
  • the refrigeration cycle device 100 is configured to form a refrigerant flow path such that the outdoor heat exchanger 4 is located on the downstream side and the outdoor heat exchanger 3 is located on the upstream side during cooling operation. There is.
  • the refrigerant distributor 41 of the outdoor heat exchanger 4 disposed on the downstream side has a double pipe structure, and the inner pipe 58 is formed with a plurality of refrigerant outlet holes 58c.
  • the refrigerant flows into the outdoor heat exchanger 4 in a gas-liquid two-phase state
  • the refrigerant is biased toward the plurality of flat tubes 47 of the outdoor heat exchanger 4 due to the function of the refrigerant distributor 41.
  • the situation in which it is distributed can be controlled.
  • the required amount of heat exchange becomes uniform over the entire surface of the heat exchange body 43 included in the outdoor heat exchanger 4, and a decrease in heat exchange efficiency is prevented. be able to.
  • the outdoor heat exchanger 4 includes a refrigerant distributor 41 and a refrigerant distributor 42.
  • Both refrigerant distributors 41 and 42 have a double-pipe structure composed of an outer tube and an inner tube.
  • the inner tubes 58 and 62 are formed with refrigerant outlet holes 58c and 62c through which the refrigerant flows out from the inner tube into the outer tube.
  • a flat tube 47 is inserted into the outer tubes 57 and 61. Therefore, even when the gas-liquid two-phase refrigerant flows into the refrigerant distributor 41 or 42, the refrigerant is evenly distributed to all the flat tubes 47.
  • FIG. 19 is a perspective view showing the connection state of the outdoor heat exchanger 3C and the outdoor heat exchanger 4C in the refrigeration cycle device 100 according to the second embodiment.
  • the configuration of refrigeration cycle device 100 according to the second embodiment is basically the same as the configuration of refrigeration cycle device 100 according to the first embodiment.
  • the difference from the first embodiment is that in the second embodiment, outdoor heat exchangers 3C and 4C are provided in place of the outdoor heat exchangers 3 and 4 of the first embodiment, respectively. Since the other configurations are the same as those in Embodiment 1, the description thereof will be omitted here.
  • the heat exchange body 33 constituting the outdoor heat exchanger 3 and the heat exchange body 43 constituting the outdoor heat exchanger 4 are Two layers are arranged in the direction along the direction of the wind generated by the blower 9.
  • Embodiment 2 as shown in FIG. One layer is arranged in the direction along the direction of the wind generated by the outdoor blower 9.
  • the refrigerant flow path in which the outdoor heat exchanger 3C and the outdoor heat exchanger 4C are connected in series is expressed by a simple connection using refrigerant piping.
  • the white arrow indicates the direction of the wind generated by the outdoor blower 9.
  • the arrows written near the refrigerant pipes 35A, 36A, and 45A represent the flow of refrigerant, with solid arrows representing the flow of refrigerant during cooling operation, and dashed arrows representing refrigerant flow during heating operation. It represents the flow of
  • the outdoor heat exchanger 3C includes a refrigerant distributor 31, a refrigerant distributor 32, and a heat exchanger 33.
  • the heat exchanger 33 is composed of a plurality of flat tubes 37 and a plurality of fins 38.
  • the configuration of the heat exchanger 33 is the same as described in Embodiment 1, so a description thereof will be omitted here.
  • a refrigerant distributor 31 having a single-pipe structure is provided above the heat exchanger 33, and a refrigerant distributor 32 having a double-pipe structure is provided below the heat exchanger 33.
  • a refrigerant pipe 35A is connected to the refrigerant distributor 31 via a connecting pipe 52, and a refrigerant pipe 36A is connected to the refrigerant distributor 32 via a connecting pipe 56.
  • the outdoor heat exchanger 4C includes a refrigerant distributor 41, a refrigerant distributor 42, and a heat exchanger 43.
  • the heat exchanger 43 is composed of a plurality of flat tubes 47 and a plurality of fins 48.
  • the configuration of the heat exchanger 43 is the same as described in Embodiment 1, so a description thereof will be omitted here.
  • a refrigerant distributor 41 with a double tube structure is provided above the heat exchanger 43, and a refrigerant distributor 42 with a double tube structure is provided below the heat exchanger 43. .
  • a refrigerant pipe 36A is connected to the refrigerant distributor 41 via a connecting pipe 60
  • a refrigerant pipe 45A is connected to the refrigerant distributor 42 via a connecting pipe 64.
  • the outdoor heat exchanger 4C is sometimes called a "heat exchanger".
  • the heat exchange body 43 is sometimes referred to as a "first heat exchange body.”
  • the flat tube 47 is sometimes called a "first flat tube.”
  • Refrigerant distributor 41 may be referred to as a "first refrigerant distributor,” and refrigerant distributor 42 may be referred to as a "second refrigerant distributor.”
  • the outer tube 57 is sometimes called a "first outer tube”
  • the inner tube 58 is sometimes called a "first inner tube”
  • the partition plate 59 is sometimes called a "first partition plate.”
  • the outer tube 61 is sometimes called a "second outer tube”
  • the inner tube 62 is sometimes called a “second inner tube”
  • the partition plate 63 is sometimes called a "second partition plate.”
  • the tube end 47c of the flat tube 47 inserted into the refrigerant distributor 41 is sometimes referred to as "one end of the first flat tube”
  • the outdoor heat exchanger 3C is sometimes referred to as a "second heat exchanger".
  • Heat exchange body 33 is sometimes referred to as a "second heat exchange body.”
  • the flat tube 37 is sometimes called a "second flat tube.”
  • the refrigerant distributor 31 is sometimes called a “third refrigerant distributor,” and the refrigerant distributor 32 is sometimes called a "fourth refrigerant distributor.”
  • the outer tube 51 is sometimes referred to as a "third outer tube.”
  • the outer tube 53 is sometimes called a "fourth outer tube”
  • the inner tube 54 is sometimes called a "fourth inner tube”
  • the partition plate 55 is sometimes called a "fourth partition plate.”
  • the tube end 37c of the flat tube 37 inserted into the refrigerant distributor 31 is sometimes referred to as "one end of the second flat tube”
  • the tube end 37d of the flat tube 37 inserted into the refrigerant distributor 32 is referred to as "one end of the second flat tube”. is sometimes referred to as "the other end
  • the refrigerant distributor 41 has a double pipe structure, and the inner pipe 58 thereof has a large number of refrigerant outlet holes 58c arranged in parallel.
  • the refrigerant that has flowed into the refrigerant distributor 41 passes through the interior of the inner tube 58, it flows out from the refrigerant outlet hole 58c into the second internal space 57h of the outer tube 57.
  • the refrigerant outlet hole 58c in the inner tube 58 the refrigerant is evenly distributed to each flat tube 47 of the heat exchanger 43A.
  • the refrigerant condensed inside the heat exchanger 43 flows out from the refrigerant distributor 42 to the refrigerant pipe 45A via the connecting pipe 64.
  • the refrigerant distributor 41 on the inflow side of the outdoor heat exchanger 4C located on the downstream side among the plurality of outdoor heat exchangers 3C and the outdoor heat exchanger 4C forming a serial refrigerant flow path during refrigerant operation. has a double tube structure.
  • the inner pipe 58 of the refrigerant distributor 41 has a large number of refrigerant outlet holes 58c arranged in parallel. Thereby, in the outdoor heat exchanger 4C located on the downstream side, it is possible to improve the uniformity of distribution of the gas-liquid two-phase refrigerant to the heat exchanger 43.
  • the refrigerant distributor 42 on the inflow side of the outdoor heat exchanger 4C located on the upstream side and the refrigerant distributor 32 on the inflow side of the outdoor heat exchanger 3C located on the downstream side have a double pipe structure.
  • the inner pipe 62 of the refrigerant distributor 42 and the inner pipe 54 of the refrigerant distributor 32 each have a large number of refrigerant outflow holes 62c and refrigerant outflow holes 54c arranged in parallel.
  • the refrigerant in the gas-liquid two-phase state is uniformly distributed to the heat exchanger 43 and the heat exchanger 33. can improve sex.
  • the refrigerant distributor 41 of the outdoor heat exchanger 4C on the downstream side during cooling operation is configured with a double pipe structure, so that the same structure as in the first embodiment is achieved. Effects can be obtained.
  • FIG. 20 is a perspective view showing the external appearance of the outdoor unit 101 provided in the refrigeration cycle device 100 according to the third embodiment.
  • FIG. 21 is a plan view schematically showing an example of the configuration of the outdoor unit 101 provided in the refrigeration cycle device 100 according to the third embodiment.
  • the outdoor unit 101 includes outdoor heat exchangers 3 and 4, refrigerant pipes 35, 36, 45 (see FIG. 2) connecting the outdoor heat exchangers 3 and 4, and a housing. 101a, and an outdoor blower 9.
  • the housing 101a has a box shape, as shown in FIG. 20.
  • outdoor heat exchangers 3 and 4 are housed inside the housing 101a.
  • inside the housing 101a are the compressor 1, the four-way valve 2, the expansion valves 5 and 6, the solenoid valves 7 and 8, and the control unit 11 shown in FIG.
  • a control box (not shown) containing a control board constituting the controller is further housed.
  • an outdoor blower 9 is arranged in the upper part 101b of the housing 101a. When the outdoor blower 9 is driven to rotate, air flows as shown by the white arrows in FIG. 20 are generated. The air is sucked into the housing 101a from at least two of the four sides of the housing 101a. Further, after passing through the outdoor heat exchangers 3 and 4, the air is blown upward from an air outlet provided in the upper part 101b of the housing 101a.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 each have a rectangular shape in plan view.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are arranged to face each other.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are arranged along a part of the side surface of the housing 101a. That is, the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are arranged along two of the four side surfaces of the housing 101a.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 each have an L-shape in plan view.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are arranged at point-symmetrical positions.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are arranged along the entire side surface of the housing 101a. That is, the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are arranged along the four side surfaces of the housing 101a.
  • FIG. 21(c) shows a case where there are three outdoor heat exchangers, as in the second modification of the first embodiment shown in FIGS. 16 to 18.
  • the outdoor heat exchangers 3A, 3B, and 4 are arranged in a U-shape when viewed from above.
  • the outdoor heat exchangers 3A, 3B, and 4 are arranged along part of the side surface of the housing 101a. That is, the outdoor heat exchangers 3A, 3B, and 4 are arranged along three side surfaces of the housing 101a.
  • FIG. 22 is a perspective view showing the appearance of an outdoor unit 101 provided in a refrigeration cycle device 100 according to a modification of the third embodiment.
  • FIG. 23 is a plan view schematically showing an example of the configuration of the outdoor unit 101 provided in the refrigeration cycle device 100 according to the third embodiment.
  • one outdoor blower 9 is arranged at the upper part 101b of the housing 101a.
  • the number of outdoor blowers 9 may be one as shown in FIG. 21, or two as shown in FIG. 1 in the first embodiment.
  • FIG. 22 shows a case where two outdoor blowers 9 are provided in the upper part 101b of the housing 101a.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 each have an L-shape in plan view.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are arranged in line-symmetrical positions.
  • the outdoor heat exchanger 3 and the outdoor heat exchanger 4 are arranged along three side surfaces among the four side surfaces of the housing 101a.
  • 1 Compressor 2 Four-way valve, 2a connection port, 2b connection port, 2c connection port, 2d connection port, 3 outdoor heat exchanger, 3A outdoor heat exchanger, 3B outdoor heat exchanger, 3C outdoor heat exchanger, 3a connection Port, 3b connection port, 4 outdoor heat exchanger, 4C outdoor heat exchanger, 4a connection port, 4b connection port, 5 expansion valve, 6 expansion valve, 7 solenoid valve, 8 solenoid valve, 9 outdoor blower, 10 accumulator, 11 Control unit, 21 indoor heat exchanger, 21a connection port, 21b connection port, 22 indoor blower, 23 expansion valve, 31 refrigerant distributor, 32 refrigerant distributor, 33 heat exchange body, 33A heat exchange body, 33B heat exchange body, 34 Folded header, 35 Refrigerant pipe, 35A Refrigerant pipe, 36 Refrigerant pipe, 36A Refrigerant pipe, 37 Flat tube, 37a Pipe end, 37b Pipe end, 37c Pipe end, 37d Pipe end, 38 Fin, 41 Refrigerant distribution

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

Cet échangeur de chaleur comprend un premier corps d'échange de chaleur comprenant une pluralité de premiers tubes plats disposés espacés les uns des autres selon une première direction et présentant une direction axiale de tube s'étendant selon une seconde direction croisant la première direction, un premier distributeur de fluide frigorigène dans lequel est insérée une partie d'extrémité de chaque tube de la pluralité de premiers tubes plats, et un second distributeur de fluide frigorigène dans lequel l'autre extrémité de chacun des premiers tubes plats est insérée. Le premier distributeur de fluide frigorigène comprend un premier tube externe qui est disposé de manière à s'étendre dans la première direction et dans lequel est insérée ladite partie d'extrémité de chaque tube de la pluralité de premiers tubes plats, un premier tube interne qui est disposé de manière à s'étendre dans la première direction, qui est disposé à l'intérieur du premier tube externe, et qui comprend une pluralité de premiers trous de sortie de fluide frigorigène agencés espacés les uns des autres selon la première direction, et une première plaque de division qui est reliée à une paroi interne du premier tube externe, le premier tube interne pénétrant à travers une épaisseur de plaque ; et le second distributeur de fluide frigorigène comprend un second tube externe qui est disposé de manière à s'étendre selon la première direction et dans lequel est insérée ladite autre partie d'extrémité de chaque tube de la pluralité de premiers tubes plats, un second tube interne qui est disposé de manière à s'étendre selon la première direction, qui est disposé à l'intérieur du second tube externe, et qui comprend une pluralité de seconds trous de sortie de fluide frigorigène agencés espacés les uns des autres selon la première direction, et une seconde plaque de division qui est reliée à une paroi interne du second tube externe, le second tube interne pénétrant à travers une épaisseur de plaque.
PCT/JP2022/031523 2022-08-22 2022-08-22 Échangeur de chaleur et dispositif à cycle de réfrigération WO2024042575A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012102992A (ja) * 2010-11-11 2012-05-31 Atsuo Morikawa 室外機のパラレルフロー多段凝縮過冷却器
JP2014533819A (ja) * 2011-11-18 2014-12-15 エルジー エレクトロニクス インコーポレイティド 熱交換器
WO2019008664A1 (fr) * 2017-07-04 2019-01-10 三菱電機株式会社 Dispositif à cycle frigorifique
WO2019239446A1 (fr) * 2018-06-11 2019-12-19 三菱電機株式会社 Unité extérieure de climatiseur et climatiseur associé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012102992A (ja) * 2010-11-11 2012-05-31 Atsuo Morikawa 室外機のパラレルフロー多段凝縮過冷却器
JP2014533819A (ja) * 2011-11-18 2014-12-15 エルジー エレクトロニクス インコーポレイティド 熱交換器
WO2019008664A1 (fr) * 2017-07-04 2019-01-10 三菱電機株式会社 Dispositif à cycle frigorifique
WO2019239446A1 (fr) * 2018-06-11 2019-12-19 三菱電機株式会社 Unité extérieure de climatiseur et climatiseur associé

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