WO2009096179A1 - Unité auxiliaire pour chauffage et climatiseur - Google Patents

Unité auxiliaire pour chauffage et climatiseur Download PDF

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Publication number
WO2009096179A1
WO2009096179A1 PCT/JP2009/000332 JP2009000332W WO2009096179A1 WO 2009096179 A1 WO2009096179 A1 WO 2009096179A1 JP 2009000332 W JP2009000332 W JP 2009000332W WO 2009096179 A1 WO2009096179 A1 WO 2009096179A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
unit
heating
heat exchanger
auxiliary
Prior art date
Application number
PCT/JP2009/000332
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English (en)
Japanese (ja)
Inventor
Masakazu Okamoto
Original Assignee
Daikin Industries, Ltd.
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Filing date
Publication date
Application filed by Daikin Industries, Ltd. filed Critical Daikin Industries, Ltd.
Publication of WO2009096179A1 publication Critical patent/WO2009096179A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0401—Refrigeration circuit bypassing means for the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/02—Increasing the heating capacity of a reversible cycle during cold outdoor conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/31—Low ambient temperatures

Definitions

  • the present invention relates to a measure for improving the heating capacity of an air conditioner that heats a room by performing a refrigeration cycle.
  • Patent Document 1 discloses a so-called separate type air conditioner.
  • a refrigerant circuit is formed by connecting an outdoor unit and an indoor unit through liquid-side and gas-side connecting pipes, and a refrigeration cycle is performed by circulating the refrigerant in the refrigerant circuit. Further, during the heating operation, the high-pressure refrigerant discharged from the compressor of the outdoor unit is supplied to the indoor unit, and the indoor air is heated by this high-pressure refrigerant.
  • the air conditioner when the air conditioner is installed in a cold area where the outside air temperature in winter is very low (for example, -10 ° C or lower), the evaporation temperature of the refrigerant during heating operation is set to a value lower than the outside air temperature. There is a need to. For this reason, the difference between the high pressure and the low pressure of the refrigeration cycle becomes large, and there is a possibility that sufficient heating capacity cannot be obtained in a general single stage compression cycle.
  • Patent Document 2 discloses an air conditioner that performs a two-stage compression refrigeration cycle.
  • this air conditioner low-pressure refrigerant is sequentially compressed by a low-stage compressor and a high-stage compressor, and an intermediate-pressure gas refrigerant is supplied between the low-stage compressor and the high-stage compressor. .
  • the air conditioner which performs a two-stage compression refrigeration cycle while the power consumption in a compressor is suppressed, since the circulation amount of the refrigerant
  • an air conditioner that performs a single-stage compression refrigeration cycle only needs to have one compressor that compresses the refrigerant from the low pressure to the high pressure of the refrigeration cycle. That is, the structure of the outdoor unit in which the compressor is installed is significantly different between an air conditioner that performs a two-stage compression refrigeration cycle and an air conditioner that performs a general single-stage compression refrigeration cycle. Therefore, when heating capacity is increased by performing a two-stage compression refrigeration cycle, an air conditioner that performs a two-stage compression refrigeration cycle for applications that require a large heating capacity is suitable for applications that require an average heating capacity. Therefore, it must be designed separately from the air conditioner that performs the single-stage compression refrigeration cycle. For this reason, there existed a problem that the time and expense which design and manufacture of the air conditioning apparatus for uses which require a big heating capability increased.
  • This invention is made
  • the objective is to implement
  • the first invention relates to a refrigerant circuit (15) of an air conditioner in which an outdoor unit (20) and an indoor unit (30) are connected by a liquid side connecting pipe (16) and a gas side connecting pipe (17) to perform a refrigeration cycle. It is intended for the heating auxiliary unit connected to. Then, an expansion mechanism (53) that expands the refrigerant supplied from the liquid side connection pipe (16), a refrigerant that has passed through the expansion mechanism (53), and a refrigerant that flows through the liquid side connection pipe (16) are heated.
  • the compressor (54) is configured to operate.
  • the heating auxiliary unit (50) of the first invention is disposed between the indoor unit (30) and the outdoor unit (20) in the refrigerant circuit (15) of the air conditioner (10).
  • the refrigerant circulates between the indoor unit (30) and the outdoor unit (20), and at the same time, the refrigerant also circulates between the indoor unit (30) and the auxiliary heating unit (50). To do.
  • the heating auxiliary unit (50) includes a liquid side communication pipe from the indoor unit (30) to the outdoor unit (20). Part of the refrigerant flowing through (16) flows in. The refrigerant flowing into the heating auxiliary unit (50) is decompressed when passing through the expansion mechanism (53) and then flows into the refrigerant heat exchanger (60). In the refrigerant heat exchanger (60), the refrigerant that has passed through the expansion mechanism (53) absorbs heat from the refrigerant flowing in the liquid side communication pipe (16) toward the outdoor unit (20) and evaporates.
  • the refrigerant evaporated in the refrigerant heat exchanger (60) is compressed by the auxiliary compressor (54) and then discharged to the gas side communication pipe (17), from the outdoor unit (20) to the gas side communication pipe (17). It is sent to the indoor unit (30) together with the sent refrigerant. In the indoor unit (30) during the heating operation, the sent refrigerant radiates heat to the air.
  • a gas-liquid separator (65) capable of storing liquid refrigerant is provided between the refrigerant heat exchanger (60) and the auxiliary compressor (54). It is.
  • the auxiliary unit for heating (50) is provided with a gas-liquid separator (65).
  • the refrigerant that has passed through the expansion mechanism (53) and the refrigerant heat exchanger (60) in order is sucked into the auxiliary compressor (54) through the gas-liquid separator (65).
  • the refrigerant sent from the expansion mechanism (53) to the refrigerant heat exchanger (60) does not completely evaporate and the refrigerant heat exchanger (60 ) May flow out.
  • the gas-liquid two-phase refrigerant sent from the refrigerant heat exchanger (60) to the gas-liquid separator (65) is separated into liquid refrigerant and gas refrigerant by the gas-liquid separator (65).
  • the gas refrigerant flows out of the gas-liquid separator (65) and is sucked into the auxiliary compressor (54), while the liquid refrigerant is accumulated in the gas-liquid separator (65).
  • the amount of liquid refrigerant accumulated in the gas-liquid separator (65) is changed, the amount of refrigerant circulating in the refrigerant circuit (15) between the indoor unit (30) and the outdoor unit (20) changes.
  • the third aspect of the present invention is the air conditioner according to the second aspect, wherein the outdoor heat exchanger (24) provided in the outdoor unit (20) for exchanging heat between the refrigerant and outdoor air is defrosted by heating with the refrigerant. Configured to operate the auxiliary compressor (54) to supply the refrigerant discharged from the auxiliary compressor (54) to the outdoor unit (20) during the defrosting operation of the apparatus. It is.
  • the air conditioner (10) provided with the auxiliary heating unit (50) of the third invention performs a defrosting operation.
  • frost may adhere to the outdoor heat exchanger (24) of the outdoor unit (20) during heating operation, so that the frost attached to the outdoor heat exchanger (24) is melted.
  • the defrosting operation is performed.
  • the high-temperature and high-pressure gas refrigerant is supplied to the outdoor heat exchanger (24), and the frost attached to the outdoor heat exchanger (24) is heated and melted by the gas refrigerant.
  • the refrigerant that has passed through the expansion mechanism (53) and absorbed by the refrigerant heat exchanger (60) passes through the gas-liquid separator (65) and is used as an auxiliary compressor. Inhaled to (54).
  • the temperature of the refrigerant passing through the gas-liquid separator (65) is not so low. Therefore, when the liquid refrigerant is accumulated in the gas-liquid separator (65), the temperature of the liquid refrigerant is not so low.
  • the auxiliary compressor (54) is operated during the defrosting operation of the air conditioner (10), and the liquid side connection pipe ( The refrigerant flowing into 16) is sent to the gas-liquid separator (65).
  • the refrigerant flowing into the gas-liquid separator (65) during the defrosting operation of the air conditioner (10) is caused by the liquid refrigerant accumulated in the gas-liquid separator (65) during the heating operation of the air conditioner (10).
  • the refrigerant flowing into the outdoor unit (20) from the gas side communication pipe (17) is compressed and then supplied to the outdoor heat exchanger (24) and used for defrosting the outdoor heat exchanger (24).
  • the auxiliary compressor (54) is provided in the bypass passage (58) connecting the suction side and the discharge side of the auxiliary compressor (54) and the bypass passage (58), and the auxiliary compressor A check valve (59) that allows only the refrigerant to flow from the suction side to the discharge side of the compressor (54), and for supplying the air cooled by the indoor unit (30) to the room.
  • the refrigerant that passed through the expansion mechanism (53) with the auxiliary compressor (54) stopped was supplied to the refrigerant heat exchanger (60), and passed through the expansion mechanism (53).
  • the refrigerant and the refrigerant flowing through the liquid side connecting pipe (16) are configured to exchange heat.
  • a bypass passage (58) and a check valve (59) are provided in the heating auxiliary unit (50).
  • the refrigerant flows even during the cooling operation of the air conditioner (10). Specifically, during the cooling operation of the air conditioner (10), the auxiliary compressor (54) is stopped in the heating auxiliary unit (50). A part of the refrigerant flowing into the liquid side connection pipe (16) from the outdoor unit (20) during the cooling operation flows into the heating auxiliary unit (50), and is decompressed by the expansion mechanism (53). Sent to exchanger (60).
  • the refrigerant sent from the expansion mechanism (53) absorbs heat from the refrigerant flowing through the liquid side connecting pipe (16) toward the indoor unit (30) and evaporates.
  • the refrigerant that has passed through the expansion mechanism (53) and the refrigerant heat exchanger (60) in turn flows into the bypass passage (58), passes through the check valve (59), and flows into the gas side communication pipe (17). Further, the refrigerant cooled by the refrigerant heat exchanger (60) is supplied to the indoor unit (30) during the cooling operation through the liquid side connection pipe (16).
  • the fifth invention includes a refrigerant circuit (15) in which an outdoor unit (20) and an indoor unit (30) are connected by a liquid side connecting pipe (16) and a gas side connecting pipe (17) to perform a refrigeration cycle, It is intended for an air conditioner that performs at least a heating operation for supplying air heated by an indoor unit (30) to a room.
  • an expansion mechanism (53) that expands the refrigerant supplied from the liquid side connection pipe (16), and heat exchange between the refrigerant that has passed through the expansion mechanism (53) and the refrigerant that flows through the liquid side connection pipe (16)
  • a refrigerant heat exchanger (60) to be compressed and an auxiliary compressor (54) that compresses the refrigerant that has passed through the refrigerant heat exchanger (60) and discharges the refrigerant to the gas side communication pipe (17)
  • the auxiliary compressor (54) is operated to circulate the refrigerant between the refrigerant heat exchanger (60) and the indoor unit (30).
  • the refrigerant circuit (15) of the air conditioner (10) of the fifth invention is provided with an expansion mechanism (53), a refrigerant heat exchanger (60), and an auxiliary compressor (54).
  • the refrigerant circulates between the indoor unit (30) and the outdoor unit (20), and at the same time, the refrigerant also circulates between the indoor unit (30) and the refrigerant heat exchanger (60). To do.
  • the refrigerant flowing through the liquid side connection pipe (16) from the indoor unit (30) toward the outdoor unit (20) Flows into the expansion mechanism (53).
  • the refrigerant flowing into the expansion mechanism (53) is decompressed when passing through the expansion mechanism (53), and then flows into the refrigerant heat exchanger (60).
  • the refrigerant that has passed through the expansion mechanism (53) absorbs heat from the refrigerant flowing in the liquid side communication pipe (16) toward the outdoor unit (20) and evaporates.
  • the refrigerant evaporated in the refrigerant heat exchanger (60) is compressed by the auxiliary compressor (54) and then discharged to the gas side communication pipe (17), from the outdoor unit (20) to the gas side communication pipe (17). It is sent to the indoor unit (30) together with the sent refrigerant. In the indoor unit (30) during the heating operation, the sent refrigerant radiates heat to the air.
  • the refrigerant circuit (15) during heating operation is only between the indoor unit (30) and the outdoor unit (20).
  • the refrigerant circulates between the indoor unit (30) and the auxiliary heating unit (50). Then, the refrigerant flowing into the heating auxiliary unit (50) absorbs heat from the refrigerant sent from the indoor unit (30) to the outdoor unit (20) in the refrigerant heat exchanger (60), and then the auxiliary compressor (54 ) And then sent again to the indoor unit (30).
  • the refrigerant circuit (15) during the heating operation includes not only between the indoor unit (30) and the outdoor unit (20) but also the indoor unit (30).
  • the refrigerant also circulates between the refrigerant heat exchangers (60). Then, the refrigerant decompressed by the expansion mechanism (53) and flowing into the refrigerant heat exchanger (60) absorbs heat from the refrigerant sent from the indoor unit (30) to the outdoor unit (20), and then the auxiliary compressor ( After being compressed in 54), it is sent again to the indoor unit (30).
  • the heat remaining in the refrigerant sent back from the indoor unit (30) to the outdoor unit (20) is transferred from the refrigerant heat exchanger (60) to the auxiliary compressor (54). Can be recovered. Therefore, the heat recovered from the refrigerant sent back from the indoor unit (30) to the outdoor unit (20) can be used for heating the air in the indoor unit (30), and the heating capacity of the indoor unit (30) is increased. be able to.
  • the heating auxiliary unit (50) is connected to the refrigerant circuit (15) of the air conditioner (10), so that the air unit without changing the structure of the outdoor unit (20).
  • the heating capacity of the harmony device (10) can be improved.
  • the refrigerant circuit (15) of the air conditioner (10) is provided with the expansion mechanism (53), the refrigerant heat exchanger (60), and the auxiliary compressor (54).
  • the heating capacity of the air conditioner (10) can be improved without changing the structure of the outdoor unit (20).
  • the heating capacity can be increased without changing the structure of the outdoor unit (20). Therefore, according to this invention, it becomes possible to implement
  • the gas-liquid separator (65) is provided in the heating auxiliary unit (50). If the amount of liquid refrigerant accumulated in the gas-liquid separator (65) is changed, the amount of refrigerant circulating in the refrigerant circuit (15) between the indoor unit (30) and the outdoor unit (20) changes. . By the way, the appropriate value of the amount of refrigerant circulating in the refrigerant circuit (15) between the indoor unit (30) and the outdoor unit (20) varies depending on the conditions of the refrigeration cycle performed in the refrigerant circuit (15).
  • the appropriate value of the amount of refrigerant circulating in the refrigerant circuit (15) between the indoor unit (30) and the outdoor unit (20) is the outdoor unit (20)
  • the temperature of the refrigerant exchanging heat with the refrigerant decreases, the temperature decreases. Therefore, according to the present invention, by adjusting the amount of liquid refrigerant that accumulates in the gas-liquid separator (65) of the heating auxiliary unit (50), the interior of the refrigerant circuit (15) is connected to the indoor unit (30) and the outdoor unit. It becomes possible to keep the amount of refrigerant circulating between the units (20) at an appropriate value.
  • the auxiliary compressor (54) of the heating auxiliary unit (50) is operated during the defrosting operation of the air conditioner (10).
  • the refrigerant flowing into the heating auxiliary unit (50) from the outdoor unit (20) during the defrosting operation is caused by the liquid refrigerant accumulated in the gas-liquid separator (65) during the heating operation of the air conditioner (10). It is warmed and then compressed by the auxiliary compressor (54) before being sent back to the outdoor unit (20).
  • the air conditioner (10) provided with the heating auxiliary unit (50) of the present invention the heat retained by the liquid refrigerant accumulated in the gas-liquid separator (65) during the heating operation is converted into the outdoor heat. It can be used for defrosting the exchanger (24). Therefore, according to the present invention, the amount of heat available for defrosting the outdoor heat exchanger (24) can be increased, and the time required for defrosting the outdoor heat exchanger (24) can be shortened.
  • the heating auxiliary unit (50) is provided with the bypass passage (58) and the check valve (59), and the heating auxiliary unit (50) is also provided during the cooling operation of the air conditioner (10). 50)
  • the refrigerant passes through.
  • the refrigerant cooled by the refrigerant heat exchanger (60) of the heating auxiliary unit (50) is supplied to the indoor unit (30) during the cooling operation through the liquid side connection pipe (16). Therefore, according to the present invention, the enthalpy of the refrigerant supplied to the indoor unit (30) during the cooling operation can be lowered, and the cooling capacity obtained by the indoor unit (30) can be improved.
  • FIG. 1 is a refrigerant circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Embodiment 1 and a refrigerant flow during a cooling operation.
  • FIG. 2 is a refrigerant circuit diagram illustrating a schematic configuration of the air-conditioning apparatus according to the first embodiment and a flow of the refrigerant during heating operation.
  • FIG. 3 is a pressure-enthalpy diagram (Mollier diagram) showing a refrigeration cycle performed during heating operation in the refrigerant circuit of the air-conditioning apparatus of Embodiment 1.
  • FIG. 4 is a refrigerant circuit diagram illustrating a schematic configuration of the air-conditioning apparatus according to Embodiment 2 and a flow of the refrigerant during the cooling operation.
  • FIG. 1 is a refrigerant circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Embodiment 1 and a refrigerant flow during a cooling operation.
  • FIG. 2 is a refrigerant circuit diagram
  • FIG. 5 is a refrigerant circuit diagram illustrating a schematic configuration of the air-conditioning apparatus according to Embodiment 2 and a flow of the refrigerant during heating operation.
  • FIG. 6 is a refrigerant circuit diagram illustrating a schematic configuration of the air-conditioning apparatus according to Embodiment 2 and a refrigerant flow during a defrosting operation.
  • FIG. 7 is a refrigerant circuit diagram illustrating a schematic configuration of an air conditioner according to another embodiment and a flow of the refrigerant during the cooling operation.
  • FIG. 8 is a pressure-enthalpy diagram (Mollier diagram) showing a refrigeration cycle performed during cooling operation in the refrigerant circuit of the air conditioner of another embodiment.
  • Air conditioner 15 Refrigerant circuit 16 Liquid side connection pipe 17 Gas side connection pipe 20 Outdoor unit 30 Indoor unit 50 Heating auxiliary unit 53 Expansion valve (expansion mechanism) 54 Auxiliary compressor 58 Bypass pipe (bypass passage) 59 Check valve 60 Refrigerant heat exchanger 65 Gas-liquid separator
  • Embodiment 1 of the Invention A first embodiment of the present invention will be described.
  • the present embodiment is a so-called separate type air conditioner (10).
  • the air conditioner (10) of the present embodiment includes an outdoor unit (20), an indoor unit (30), and a heating auxiliary unit (50) one by one. Yes.
  • the outdoor unit (20) and the heating auxiliary unit (50) are installed outdoors, and the indoor unit (30) is installed indoors.
  • the numbers of outdoor units (20), indoor units (30), and heating auxiliary units (50) shown here are merely examples.
  • the heating auxiliary unit (50) may be installed indoors.
  • the outdoor circuit (21) is accommodated in the outdoor unit (20).
  • An indoor circuit (31) is accommodated in the indoor unit (30).
  • a heating auxiliary circuit (51) is accommodated in the heating auxiliary unit (50).
  • the outdoor circuit (21), the indoor circuit (31), and the heating auxiliary circuit (51) are connected by the liquid side connection pipe (16) and the gas side connection pipe (17).
  • the refrigerant circuit (15) is formed.
  • the outdoor circuit (21) is provided with a main compressor (22), a four-way switching valve (23), an outdoor heat exchanger (24), and an outdoor expansion valve (25).
  • the main compressor (22) has its discharge side connected to the first port of the four-way switching valve (23) and its suction side connected to the second port of the four-way switching valve (23).
  • the outdoor heat exchanger (24) has one end connected to the third port of the four-way selector valve (23) and the other end connected to the liquid side communication pipe (16) via the outdoor expansion valve (25).
  • the four-way switching valve (23) has a fourth port connected to the gas side communication pipe (17).
  • the outdoor heat exchanger (24) is a fin-and-tube heat exchanger that exchanges heat between the refrigerant and outdoor air.
  • the outdoor unit (20) accommodates an outdoor fan (26) for sending outdoor air to the outdoor heat exchanger (24).
  • the four-way switching valve (23) includes a first state (state shown in FIG. 1) in which the first port and the third port communicate with each other, and the second port and the fourth port communicate with each other; It is configured to be switchable to a second state (state shown in FIG. 2) in which the fourth port communicates and the second port communicates with the third port.
  • the outdoor expansion valve (25) is a so-called electronic expansion valve.
  • the indoor circuit (31) is provided with an indoor heat exchanger (32).
  • the indoor circuit (31) has one end located on the liquid side of the indoor heat exchanger (32) connected to the liquid side connecting pipe (16) and the other end located on the gas side of the indoor heat exchanger (32). It is connected to the gas side communication pipe (17).
  • the indoor heat exchanger (32) is a fin-and-tube heat exchanger that exchanges heat between refrigerant and room air.
  • the indoor unit (30) accommodates an indoor fan (34) for sending room air to the indoor heat exchanger (32).
  • the heating auxiliary circuit (51) is composed of a main pipe section (56) and a communication pipe section (57).
  • the heating auxiliary circuit (51) is provided with an auxiliary compressor (54), a refrigerant heat exchanger (60), and an expansion valve (53) that is an expansion mechanism.
  • the refrigerant heat exchanger (60) is a so-called plate heat exchanger.
  • a plurality of first passages (61) and second passages (62) are formed, and the refrigerant flowing through the first passage (61) and the second passage (62) flow. Heat exchange is performed with the refrigerant.
  • the expansion valve (53) of the heating auxiliary circuit (51) is a so-called electronic expansion valve.
  • an expansion valve (53), a second passage (62) of the refrigerant heat exchanger (60), and an auxiliary compressor (54) are sequentially arranged from one end to the other end.
  • One end of the main pipe (56) on the expansion valve (53) side is connected to the connecting pipe (57), and the other end on the auxiliary compressor (54) side (that is, the auxiliary compressor (54)).
  • the discharge side end of the gas is connected to the gas side connecting pipe (17).
  • the connecting pipe (57) is inserted in the middle of the liquid side connecting pipe (16) connecting the outdoor unit (20) and the indoor unit (30). Further, in the communication piping section (57), the first passage (61) of the refrigerant heat exchanger (60) is connected to a portion closer to the outdoor unit (20) than the position where the main piping section (56) is connected. Has been.
  • the air conditioner (10) of the present embodiment selectively performs a cooling operation and a heating operation.
  • the operation of the air conditioner (10) during the cooling operation and the heating operation will be described.
  • ⁇ Cooling operation The operation of the air conditioner (10) during the cooling operation will be described.
  • the main compressor (22) is operated, the four-way switching valve (23) is set to the first state, and the opening degree of the outdoor expansion valve (25) is appropriately adjusted.
  • the heating auxiliary unit (50) is in a resting state. That is, in the heating auxiliary unit (50), the expansion valve (53) is fully closed, and the auxiliary compressor (54) is stopped.
  • the refrigerant discharged from the main compressor (22) flows into the outdoor heat exchanger (24) through the four-way switching valve (23), dissipates heat to the outdoor air, and condenses.
  • the refrigerant condensed in the outdoor heat exchanger (24) is reduced in pressure when passing through the outdoor expansion valve (25) to be in a gas-liquid two-phase state, and thereafter flows into the liquid side communication pipe (16).
  • the refrigerant flowing into the liquid side connection pipe (16) flows into the indoor circuit (31) after passing through the connection pipe section (57) of the heating auxiliary circuit (51).
  • the refrigerant flowing into the indoor circuit (31) flows into the indoor heat exchanger (32), absorbs heat from the indoor air, and evaporates.
  • the indoor unit (30) supplies air cooled to the room while passing through the indoor heat exchanger (32).
  • the refrigerant evaporated in the indoor heat exchanger (32) returns to the outdoor circuit (21) through the gas side connecting pipe (17), and is sucked into the main compressor (22) after passing through the four-way switching valve (23). .
  • the main compressor (22) compresses the sucked refrigerant and discharges it.
  • ⁇ Heating operation> The operation of the air conditioner (10) during the heating operation will be described.
  • the main compressor (22) is operated, the four-way switching valve (23) is set to the second state, and the opening degree of the outdoor expansion valve (25) is appropriately adjusted.
  • the heating auxiliary unit (50) is operated when the heating load is large (for example, when the outside air temperature is less than 0 ° C), and when the heating load is small (for example, the outside air temperature is 0 ° C or higher). If).
  • the auxiliary compressor (54) is operated, and the opening degree of the expansion valve (53) is appropriately adjusted.
  • the refrigeration cycle performed in the refrigerant circuit (15) during the heating operation will be described with reference to FIG.
  • the refrigeration cycle when the heating auxiliary unit (50) is operated will be described.
  • the heating auxiliary unit (50) is in operation, in the refrigerant circuit (15) during heating operation, the refrigerant circulates between the outdoor unit (20) and the indoor unit (30), and the heating auxiliary unit ( 50) and the refrigerant circulate between the indoor unit (30).
  • the main compressor (22) sucks and compresses the gas refrigerant in the state of point A.
  • the refrigerant that has been compressed by the main compressor (22) to the state of point B passes through the four-way switching valve (23), then flows into the gas side communication pipe (17), and flows toward the indoor circuit (31).
  • the auxiliary compressor (54) sucks and compresses the gas refrigerant in the state of point G.
  • the refrigerant that has been compressed by the auxiliary compressor (54) to the state of point H flows into the gas side connecting pipe (17) and joins with the refrigerant discharged from the main compressor (22).
  • the refrigerant discharged from the main compressor (22) and the refrigerant discharged from the auxiliary compressor (54) merge in the gas side connecting pipe (17) and then flow into the indoor circuit (31).
  • the refrigerant that has flowed into the indoor circuit (31) flows into the indoor heat exchanger (32).
  • the refrigerant flowing into the indoor heat exchanger (32) dissipates heat and condenses into the indoor air sent by the indoor fan (34), and becomes a liquid refrigerant in the state of point C.
  • the refrigerant that has flowed out of the indoor heat exchanger (32) flows into the liquid side communication pipe (16).
  • the indoor unit (30) in the heating operation takes indoor air heated by the indoor heat exchanger (32) into the room. Blow out.
  • the refrigerant that has flowed into the first passage (61) of the refrigerant heat exchanger (60) dissipates heat to the refrigerant flowing through the second passage (62) and enters the state of point D.
  • the refrigerant that has flowed out of the first passage (61) of the refrigerant heat exchanger (60) again flows into the outdoor circuit (21) through the liquid side connection pipe (16).
  • the refrigerant that has flowed into the outdoor circuit (21) is decompressed when passing through the outdoor expansion valve (25), becomes a state of point E, and then flows into the outdoor heat exchanger (24).
  • the refrigerant flowing into the outdoor heat exchanger (24) evaporates by exchanging heat with the outdoor air supplied by the outdoor fan (26), and becomes a gas refrigerant in the state of point A.
  • the refrigerant that has flowed out of the outdoor heat exchanger (24) passes through the four-way switching valve (23) and is then sucked into the main compressor (22) and compressed.
  • the refrigerant flowing into the main pipe section (56) is depressurized by the expansion valve (53) to be in the state of point F, and then flows into the second passage (62) of the refrigerant heat exchanger (60).
  • the refrigerant flowing into the second passage (62) of the refrigerant heat exchanger (60) absorbs heat from the refrigerant flowing through the first passage (61) and evaporates to become a gas refrigerant in the state of point G.
  • the refrigerant flowing out from the second passage (62) of the refrigerant heat exchanger (60) is sucked into the auxiliary compressor (54) and compressed.
  • the capacity of the auxiliary compressor (54) and the opening of the expansion valve (53) are controlled as follows.
  • the heating auxiliary unit (50) sets the target value of the capacity of the auxiliary compressor (54) based on the outside air temperature and the capacity of the main compressor (22), and sets the auxiliary compressor (54).
  • the frequency of the alternating current supplied to the motor of the auxiliary compressor (54) is adjusted so that the capacity of) becomes the set target value.
  • the heating auxiliary unit (50) during the heating operation is set such that the degree of superheat of the refrigerant at the outlet of the second passage (62) of the refrigerant heat exchanger (60) becomes a predetermined target value (for example, 2 ° C.).
  • the opening degree of the expansion valve (53) is adjusted.
  • the refrigerant circulates only between the outdoor unit (20) and the indoor unit (30) in the refrigerant circuit (15) during the heating operation. That is, only the refrigerant discharged from the main compressor (22) of the outdoor unit (20) is sent to the indoor unit (30), and the refrigerant condensed in the indoor heat exchanger (32) of the indoor unit (30) is the outdoor unit. Sent back to (20).
  • Embodiment 1- In the air conditioner (10) of the present embodiment, in the refrigerant circuit (15) during heating operation, not only between the indoor unit (30) and the outdoor unit (20), but also the indoor unit (30) and the heating auxiliary unit. The refrigerant circulates even during (50). Then, the refrigerant flowing into the heating auxiliary unit (50) absorbs heat from the refrigerant sent from the indoor unit (30) to the outdoor unit (20) in the refrigerant heat exchanger (60), and then the auxiliary compressor (54 ) And then sent again to the indoor unit (30).
  • the heat remaining in the refrigerant sent back from the indoor unit (30) to the outdoor unit (20) is sent from the refrigerant heat exchanger (60) to the auxiliary compressor (54). It can be recovered in the refrigerant. Therefore, the heat recovered from the refrigerant sent back from the indoor unit (30) to the outdoor unit (20) can be used for heating the air in the indoor unit (30), and the heating capacity of the indoor unit (30) is increased. be able to.
  • the enthalpy of the refrigerant flowing into the outdoor expansion valve (25) during the heating operation is the value at the point C in FIG. 3 when the heating auxiliary unit (50) is not provided, whereas the air of the present embodiment In the harmony device (10), the value is at point D in the figure.
  • the enthalpy of the refrigerant flowing into the outdoor heat exchanger (24) serving as an evaporator during the heating operation can be lowered. Therefore, according to the present embodiment, the amount of heat absorbed by the refrigerant from the outdoor air can be increased in the outdoor heat exchanger (24) during the heating operation, and this also increases the heating capacity of the indoor unit (30). be able to.
  • the heating capacity of the air conditioner (10) can be increased by simply connecting the heating auxiliary unit (50) to the refrigerant circuit (15) without changing the structure of the outdoor unit (20). Can be improved. Therefore, according to this embodiment, it is possible to realize an air conditioner (10) for an application that requires a large heating capacity (for example, for a cold district) while keeping the time and cost required for the design and manufacture low. It becomes.
  • Embodiment 2 of the Invention A second embodiment of the present invention will be described.
  • the present embodiment is obtained by changing the configuration of the heating auxiliary unit (50) in the air conditioner (10) of the first embodiment.
  • the heating auxiliary unit (50) of the present embodiment differences from the first embodiment will be described.
  • the heating auxiliary unit (50) of the present embodiment is provided with a gas-liquid separator (65).
  • the gas-liquid separator (65) is formed in a substantially cylindrical closed container shape.
  • the gas-liquid separator (65) is provided with an inflow pipe (66) and an outflow pipe (67).
  • the inflow pipe (66) and the outflow pipe (67) both penetrate the top of the gas-liquid separator (65).
  • the lower end of the inflow pipe (66) opens near its bottom, and the lower end of the outflow pipe (67) opens near its upper end.
  • the gas-liquid separator (65) is configured to separate the refrigerant that has flowed in through the inflow pipe (66) into liquid refrigerant and gas refrigerant, and send out only the gas refrigerant from the outflow pipe (67).
  • the gas-liquid separator (65) is connected to the main pipe section (56) of the heating auxiliary circuit (51). Specifically, the gas-liquid separator (65) is disposed between the refrigerant heat exchanger (60) and the auxiliary compressor (54) in the main pipe section (56).
  • the gas-liquid separator (65) has an inflow pipe (66) connected to the second passage (62) of the refrigerant heat exchanger (60) and an outflow pipe (67) of the auxiliary compressor (54). Connected to the suction side.
  • the air conditioner (10) of the present embodiment selectively performs the cooling operation and the heating operation as in the first embodiment.
  • the heating auxiliary unit (50) pauses in the same manner as in the first embodiment, and the refrigerant circulates in the refrigerant circuit (15) as in the first embodiment (see FIG. 4).
  • the operation of the air conditioner (10) during the heating operation will be described.
  • the heating auxiliary unit (50) is operated when the heating load is large, and the heating auxiliary unit (50) when the heating load is small. 50) pauses.
  • the heating operation in which the heating auxiliary unit (50) is operated is referred to as “high load heating operation”
  • the heating operation in which the heating auxiliary unit (50) is stopped is referred to as “low load heating operation”.
  • the refrigerant circulates and the refrigeration cycle is performed as in the case of the first embodiment. That is, in the refrigerant circuit (15), the refrigerant circulates between the outdoor unit (20) and the indoor unit (30), and also circulates between the heating auxiliary unit (50) and the indoor unit (30) ( (See FIG. 5). However, in the main piping section (56) of the heating auxiliary unit (50) of the present embodiment, the refrigerant flowing out from the second passage (62) of the refrigerant heat exchanger (60) passes through the gas-liquid separator (65). After that, it is sucked into the auxiliary compressor (54).
  • the refrigerant is circulated and the refrigeration cycle is performed as in the case of the first embodiment. That is, in the refrigerant circuit (15), the refrigerant circulates only between the outdoor unit (20) and the indoor unit (30).
  • the heating auxiliary unit (50) of the present embodiment is configured to perform a refrigerant amount adjusting operation for adjusting the amount of refrigerant circulating in the refrigerant circuit (15).
  • This refrigerant quantity adjustment operation may be performed both during the high load heating operation and during the low load heating operation. That is, in the air conditioner (10) of the present embodiment, the heating auxiliary unit (50) may be temporarily operated to perform the refrigerant amount adjustment operation even during the low load heating operation.
  • This refrigerant quantity adjustment operation adjusts the amount of liquid refrigerant stored in the gas-liquid separator (65) so that the amount of refrigerant circulating in the refrigerant circuit (15) becomes an appropriate value according to the operating state at that time. It is.
  • the heating auxiliary unit (50) during the refrigerant amount adjustment operation monitors whether the amount of refrigerant circulating in the refrigerant circuit (15) is an appropriate value.
  • the heating auxiliary unit (50) is sucked into the main compressor (22) even though the discharge pressure of the main compressor (22) (that is, the high pressure of the refrigeration cycle) is higher than usual.
  • the refrigerant is in a wet state, it is determined that the amount of refrigerant is excessive, and an operation for increasing the amount of liquid refrigerant stored in the gas-liquid separator (65) is performed.
  • the heating auxiliary unit (50) performs an operation of forcibly expanding the opening degree of the expansion valve (53) to store the liquid refrigerant in the gas-liquid separator (65). This is done as an operation to increase the amount.
  • the heating auxiliary unit (50) performs this operation, the flow rate of the refrigerant flowing from the communication pipe (57) into the main pipe (56) increases, and the second passage ( A part of the refrigerant flowing into 62) does not evaporate and flows into the gas-liquid separator (65) as liquid refrigerant. Since the auxiliary compressor (54) sucks only the gas refrigerant from the gas-liquid separator (65), the amount of liquid refrigerant in the gas-liquid separator (65) increases.
  • the heating auxiliary unit (50) opens the opening of the expansion valve (53) to start the auxiliary compressor (54). This is performed as an operation for increasing the amount of liquid refrigerant stored.
  • the heating auxiliary unit (50) performs this operation, the refrigerant flows from the communication pipe (57) into the main pipe (56).
  • the flow rate of the refrigerant flowing into the main pipe (56) reaches a certain level or more, a part of the refrigerant flowing into the second passage (62) of the refrigerant heat exchanger (60) is not evaporated but remains as a liquid refrigerant. It flows into the liquid separator (65). Since the auxiliary compressor (54) sucks only the gas refrigerant from the gas-liquid separator (65), the amount of liquid refrigerant in the gas-liquid separator (65) increases.
  • the suction pressure of the main compressor (22) (that is, the low pressure of the refrigeration cycle) becomes too low despite the outdoor unit (20) performing proper operation.
  • the superheat of the refrigerant sucked in the main compressor (22) becomes too large, it is judged that the refrigerant amount is insufficient, and the operation for reducing the amount of liquid refrigerant stored in the gas-liquid separator (65) is performed. Do.
  • the heating auxiliary unit (50) performs an operation for forcibly reducing the opening degree of the expansion valve (53) to store liquid refrigerant in the gas-liquid separator (65). This is done as an operation to reduce the amount.
  • the heating auxiliary unit (50) performs this operation, the flow rate of the refrigerant flowing from the communication pipe (57) to the main pipe (56) decreases, and the refrigerant flowing into the gas-liquid separator (65) is reduced. The flow rate is also reduced.
  • coolant which the compressor for auxiliary (54) sucks from a gas-liquid separator (65) does not change, the quantity of the liquid refrigerant in a gas-liquid separator (65) reduces.
  • the heating auxiliary unit (50) performs the operation of starting the auxiliary compressor (54) with the expansion valve (53) closed, and the liquid in the gas-liquid separator (65). This is performed as an operation for reducing the amount of refrigerant stored.
  • the auxiliary compressor (54) sucks out the gas refrigerant from the gas-liquid separator (65), but the refrigerant flows into the gas-liquid separator (65). do not do. For this reason, the amount of liquid refrigerant in the gas-liquid separator (65) decreases.
  • the air conditioner (10) of the present embodiment performs a defrosting operation every time a predetermined condition (for example, a condition in which the integrated value of the operation time of the main compressor (22) reaches a predetermined value) is satisfied during the heating operation. .
  • a predetermined condition for example, a condition in which the integrated value of the operation time of the main compressor (22) reaches a predetermined value
  • the main compressor (22) In the outdoor unit (20) during the defrosting operation, the main compressor (22) is operated, the four-way switching valve (23) is set to the first state (the state shown in FIG. 6), and the outdoor expansion valve (25) The opening is adjusted as appropriate. Further, in the heating auxiliary unit (50) during the defrosting operation, the auxiliary compressor (54) is operated, and the expansion valve (53) is set to a fully open state.
  • the high-temperature and high-pressure refrigerant discharged from the main compressor (22) is sent to the outdoor heat exchanger (24) through the four-way switching valve (23).
  • frost adhering to the surface is heated and melted by the supplied refrigerant.
  • the refrigerant that has flowed out of the outdoor heat exchanger (24) flows through the liquid side connecting pipe (16) into the connecting pipe section (57) of the heating auxiliary circuit (51). Since the auxiliary compressor (54) is operated during the defrosting operation, almost all of the refrigerant that has flowed into the communication pipe (57) flows into the main pipe (56).
  • the refrigerant flowing into the main pipe section (56) sequentially passes through the expansion valve (53) and the second passage (62) of the refrigerant heat exchanger (60), and then flows into the gas-liquid separator (65).
  • Liquid refrigerant is stored in the gas-liquid separator (65). Further, during the heating operation, for example, a refrigerant having an intermediate pressure of about 10 ° C. passes through the gas-liquid separator (65). Therefore, the temperature of the liquid refrigerant accumulated in the gas-liquid separator (65) is changed during the heating operation. It is equivalent to the temperature of the refrigerant passing through the gas-liquid separator (65). For this reason, the refrigerant flowing into the gas-liquid separator (65) during the defrosting operation is warmed by the refrigerant accumulated in the gas-liquid separator (65).
  • the auxiliary compressor (54) compresses the refrigerant sucked from the gas-liquid separator (65) and discharges the refrigerant toward the gas side connecting pipe (17).
  • the refrigerant discharged from the auxiliary compressor (54) to the gas side communication pipe (17) flows into the outdoor circuit (21), and then is sucked into the main compressor (22) and compressed.
  • the gas-liquid separator (65) is provided in the heating auxiliary unit (50).
  • the heating auxiliary unit (50) performing the refrigerant amount adjustment operation
  • the inside of the refrigerant circuit (15) is associated with the indoor unit (30 )
  • the outdoor unit (20) change the amount of refrigerant circulating.
  • the appropriate value of the amount of the refrigerant circulating in the refrigerant circuit (15) between the indoor unit (30) and the outdoor unit (20) varies depending on the conditions of the refrigeration cycle performed in the refrigerant circuit (15).
  • the appropriate value of the amount of refrigerant circulating in the refrigerant circuit (15) between the indoor unit (30) and the outdoor unit (20) is the outdoor unit (20)
  • the temperature of the refrigerant exchanging heat with the refrigerant decreases, the temperature decreases.
  • the inside of the refrigerant circuit (15) is connected to the indoor unit (30). It becomes possible to keep the amount of refrigerant circulating between the outdoor units (20) at an appropriate value.
  • the auxiliary compressor (54) of the heating auxiliary unit (50) is operated during the defrosting operation.
  • the refrigerant flowing into the heating auxiliary unit (50) from the outdoor unit (20) during the defrosting operation is warmed by the liquid refrigerant accumulated in the gas-liquid separator (65), and then the auxiliary compressor (54 ) And then sent back to the outdoor unit (20).
  • the heat retained by the liquid refrigerant accumulated in the gas-liquid separator (65) can be used for defrosting the outdoor heat exchanger (24). it can.
  • the heat imparted to the refrigerant when the auxiliary compressor (54) compresses the refrigerant can also be used for defrosting the outdoor heat exchanger (24). Therefore, according to the present embodiment, the amount of heat available for defrosting the outdoor heat exchanger (24) can be increased, and the time required for defrosting the outdoor heat exchanger (24) can be shortened.
  • the auxiliary compressor (54) of the heating auxiliary unit (50) is operated during the defrosting operation. For this reason, during the defrosting operation, almost all of the refrigerant sent from the outdoor unit (20) to the liquid side connection pipe (16) flows into the main pipe section (56) of the heating auxiliary circuit (51). . That is, during the defrosting operation, the low-temperature refrigerant that has flowed out of the outdoor unit (20) hardly flows into the indoor heat exchanger (32) of the indoor unit (30). Therefore, according to this embodiment, it is possible to substantially prevent the low-temperature refrigerant from flowing into the indoor heat exchanger (32) during the defrosting operation, and the air cooled by the indoor heat exchanger (32). Can be prevented from flowing into the room and causing discomfort to the people in the room.
  • a bypass pipe (58) that forms a bypass passage may be provided in the heating auxiliary circuit (51) of the heating auxiliary unit (50).
  • a bypass pipe (58) in the air conditioning apparatus (10) of the said Embodiment 2 is demonstrated.
  • the bypass pipe (58) is provided in the main pipe section (56) of the heating auxiliary circuit (51).
  • the bypass pipe (58) connects the suction side and the discharge side of the auxiliary compressor (54).
  • one end of the bypass pipe (58) is connected between the auxiliary compressor (54) and the gas-liquid separator (65), and the other end is connected to the auxiliary compressor (54) and the gas side communication pipe.
  • the bypass pipe (58) is provided with a check valve (59).
  • the check valve (59) is configured to allow the refrigerant to flow from one end to the other end of the bypass pipe (58) and prevent the refrigerant from flowing in the opposite direction. That is, during operation of the auxiliary compressor (54), the other end side is at a higher pressure than the one end side of the bypass pipe (58), so that the check valve (59) is closed.
  • the heating auxiliary unit (50) of this modification performs an operation for cooling the refrigerant flowing through the liquid side communication pipe (16) during the cooling operation of the air conditioner (10).
  • the refrigeration cycle performed during the cooling operation by the air conditioner (10) provided with the heating auxiliary unit (50) of the present modification will be described with reference to FIG.
  • the main compressor (22) sucks and compresses the gas refrigerant in the state of point I.
  • the refrigerant that has been compressed by the main compressor (22) to the state of point J is sent to the outdoor heat exchanger (24) through the four-way switching valve (23).
  • the refrigerant flowing into the outdoor heat exchanger (24) dissipates heat to the outdoor air and becomes a liquid refrigerant in the state of point K.
  • the refrigerant that has flowed out of the outdoor heat exchanger (24) is depressurized when passing through the outdoor expansion valve (25), and is in a state of point L.
  • the refrigerant that has passed through the outdoor expansion valve (25) flows into the first passage (61) of the refrigerant heat exchanger (60) through the liquid side connection pipe (16).
  • the refrigerant that has flowed into the first passage (61) of the refrigerant heat exchanger (60) is cooled by the refrigerant flowing through the second passage (62) to be in the state of point M.
  • Part of the refrigerant that has passed through the first passage (61) of the refrigerant heat exchanger (60) flows into the heating auxiliary circuit (51), and the rest flows into the indoor circuit (31).
  • the refrigerant flowing into the heating auxiliary circuit (51) is decompressed when passing through the expansion valve (53), and becomes a gas-liquid two-phase refrigerant in the state of point N.
  • the refrigerant that has passed through the expansion valve (53) flows into the second passage (62) of the refrigerant heat exchanger (60), absorbs heat from the refrigerant flowing through the first passage (61), and evaporates.
  • the refrigerant that has passed through the second passage (62) of the refrigerant heat exchanger (60) flows into the gas side communication pipe (17) through the bypass pipe (58).
  • the refrigerant flowing into the indoor circuit (31) is sent to the indoor heat exchanger (32).
  • the refrigerant flowing into the indoor heat exchanger (32) absorbs heat from the indoor air and evaporates. While passing through the indoor heat exchanger (32), the pressure of the refrigerant gradually decreases due to the flow resistance when passing through the heat transfer tube of the indoor heat exchanger (32).
  • the refrigerant that has passed through the indoor heat exchanger (32) flows from the indoor circuit (31) into the gas side communication pipe (17).
  • the refrigerant flowing through the gas side communication pipe (17) flows into the outdoor circuit (21), passes through the four-way switching valve (23), and is sucked into the main compressor (22).
  • the heating auxiliary unit (50) of this modification is provided with a bypass passage and a check valve (59).
  • the refrigerant cooled by the refrigerant heat exchanger (60) of the heating auxiliary unit (50) passes through the liquid side connection pipe (16) to the indoor unit (30). Supplied. Therefore, according to this modification, the enthalpy of the refrigerant supplied to the indoor unit (30) during the cooling operation can be lowered, and the cooling capacity obtained by the indoor unit (30) can be increased.
  • the outdoor circuit (21) and the heating auxiliary circuit (51) may be housed in one casing to form one unit. That is, the outdoor unit (20) and the heating auxiliary unit (50) may be integrated.
  • the configuration of the outdoor circuit (21) is the same as that of a general single-stage compression refrigeration cycle, so it is required for the design and manufacture of an air conditioner (10) for applications that require large heating capacity. Time and costs can be kept low.
  • the present invention is useful for an air conditioner that performs a refrigeration cycle.

Abstract

L'invention porte sur une unité auxiliaire (50) pour chauffage, qui est reliée à un circuit de fluide frigorigène (15) dans un climatiseur (10). Une soupape de détente (53), un échangeur de chaleur à fluide frigorigène (60) et un compresseur auxiliaire (54) sont reliés en série avec le circuit auxiliaire (51) de l'unité auxiliaire (50) pour le chauffage. Durant l'opération de chauffage, un compresseur principal (22) et le compresseur auxiliaire (54) sont actionnés et du fluide frigorigène est amené à circuler entre une unité extérieure (20) et une unité intérieure (30) et, en outre, est amené à circuler entre l'unité auxiliaire (50) et l'unité intérieure (30). Le fluide frigorigène qui s'est écoulé dans l'unité auxiliaire (50) s'écoule dans un second passage (62) dans l'échangeur de chaleur à fluide frigorigène (60) après que la pression du fluide frigorigène a été réduite par la soupape de détente (53), et s'évapore par absorption de chaleur provenant du fluide frigorigène s'écoulant à travers un premier passage (61). Ensuite, le fluide frigorigène est comprimé par le compresseur auxiliaire (54) et envoyé à l'unité intérieure (30).
PCT/JP2009/000332 2008-02-01 2009-01-28 Unité auxiliaire pour chauffage et climatiseur WO2009096179A1 (fr)

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JP2008-022898 2008-02-01
JP2008022898A JP5163161B2 (ja) 2008-02-01 2008-02-01 暖房用補助ユニットおよび空気調和装置

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JP2012207826A (ja) * 2011-03-29 2012-10-25 Fujitsu General Ltd 冷凍サイクル装置
JP2012207823A (ja) * 2011-03-29 2012-10-25 Fujitsu General Ltd 冷凍サイクル装置
KR101635571B1 (ko) * 2015-09-10 2016-07-01 송원대학교산학협력단 냉매 회수 기능을 가지는 전기 축열식 히트 펌프 시스템
CN106016873B (zh) * 2016-05-26 2018-07-17 西安交通大学 一种两级压缩切换至部分二元复叠的空气源热泵除霜系统

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JPS60226669A (ja) * 1984-04-24 1985-11-11 三洋電機株式会社 冷凍装置
JP2005061784A (ja) * 2003-08-20 2005-03-10 Yanmar Co Ltd エンジンヒートポンプ
WO2005114064A1 (fr) * 2004-05-20 2005-12-01 Yanmar Co., Ltd. Pompe thermique à moteur
US20070017240A1 (en) * 2005-07-19 2007-01-25 Hussmann Corporation Refrigeration system with mechanical subcooling

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AU2007353615B9 (en) * 2007-05-22 2012-04-19 Angelantoni Industrie Spa Refrigerating device and method for circulating a refrigerating fluid associated with it

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Publication number Priority date Publication date Assignee Title
JPS60226669A (ja) * 1984-04-24 1985-11-11 三洋電機株式会社 冷凍装置
JP2005061784A (ja) * 2003-08-20 2005-03-10 Yanmar Co Ltd エンジンヒートポンプ
WO2005114064A1 (fr) * 2004-05-20 2005-12-01 Yanmar Co., Ltd. Pompe thermique à moteur
US20070017240A1 (en) * 2005-07-19 2007-01-25 Hussmann Corporation Refrigeration system with mechanical subcooling

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