EP3872423B1 - Appareil de conditionnement d'air - Google Patents

Appareil de conditionnement d'air Download PDF

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Publication number
EP3872423B1
EP3872423B1 EP21158549.2A EP21158549A EP3872423B1 EP 3872423 B1 EP3872423 B1 EP 3872423B1 EP 21158549 A EP21158549 A EP 21158549A EP 3872423 B1 EP3872423 B1 EP 3872423B1
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EP
European Patent Office
Prior art keywords
refrigerant
regulating valve
pipe
compressor
heat exchanger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21158549.2A
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German (de)
English (en)
Other versions
EP3872423A1 (fr
EP3872423C0 (fr
Inventor
Akihiro Shigeta
Shunichi Hashimoto
Naoki Maekawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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Publication of EP3872423A1 publication Critical patent/EP3872423A1/fr
Application granted granted Critical
Publication of EP3872423C0 publication Critical patent/EP3872423C0/fr
Publication of EP3872423B1 publication Critical patent/EP3872423B1/fr
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Classifications

    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • 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
    • F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
    • 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
    • F25B2500/06—Damage
    • 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
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • F25B2500/221—Preventing leaks from developing
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves

Definitions

  • the present invention relates to an air conditioning apparatus, and more particularly, to an air conditioning apparatus that performs a refrigerant recovery operation.
  • a conventional technique that recovers a refrigerant from a use-side circuit to a heat-source-side circuit while preventing, for example, damage to a compressor and reliably reduces the amount of refrigerant leaking from the use-side circuit when refrigerant leakage occurs is disclosed (e.g., refer to Japanese Patent Laid-Open No. 2019-074222 ).
  • an outdoor expansion valve is disposed on a liquid-side pipe of an outdoor circuit, and the outdoor circuit is provided with a liquid-side bypass pipe for allowing the liquid-side pipe to communicate with a suction side of the compressor.
  • an outdoor controller executes a refrigerant recovery control operation of operating the compressor with a liquid-side control valve closed and executes a valve control operation of opening a liquid-side bypass valve of the liquid-side bypass pipe in the refrigerant recovery control operation, which prevents an excessive rise in the discharge temperature of the compressor in the refrigerant recovery control operation.
  • the low pressure gradually decreases by performing the refrigerant recovery operation (pump down).
  • the evaporation temperature decreases, the temperature difference from indoor air increases, and the superheat degree thus increases at an outlet of an indoor heat exchanger.
  • the temperature of the refrigerant discharged from the compressor also increases.
  • the temperature of the refrigerant discharged from the compressor reaches the vicinity of an upper limit (e.g., 100°C) even in the cooling operation.
  • the present invention has been made in view of the points described above, and an object thereof is to provide an air conditioning apparatus capable of reliably performing refrigerant recovery even when the outside temperature is high.
  • EP 3 279 580 A1 describes a controller that performs a pump-down operation in which, when a leakage of refrigerant is detected, a flow switching device is switched to a direction of a cooling operation so that refrigerant in a refrigerant main pipe is recovered into a heat-side heat exchanger and an accumulator, and in which a refrigerant shutoff device, a bypass opening-closing device and operation of a compressor are controlled, and then performs a refrigerant leakage amount reduction operation in which the flow switching device is switched to a direction of a heating operation so that the recovered refrigerant is enclosed in the heat-side heat exchanger and the accumulator, and in which the refrigerant shutoff device, the bypass opening-closing device and operation of the compressor are controlled.
  • EP 3 279 580 A1 discloses an air conditioning apparatus comprising: an outdoor unit including a compressor and an outdoor heat exchanger; an indoor unit including an indoor heat exchanger; a refrigerant pipe connecting the outdoor unit and the indoor unit and including a liquid-side pipe and a gas-side pipe; circuit switching means disposed on the refrigerant pipe; a first regulating valve disposed on the refrigerant pipe; a control unit, wherein the air conditioning apparatus comprises: a connecting pipe connecting the compressor and the refrigerant pipe between the first regulating valve and the indoor heat exchanger; and a regulating valve disposed on the pipe, wherein the control unit executes a first refrigerant recovery operation including: controlling the circuit switching means so that the outdoor heat exchanger serves as a radiator and the indoor heat exchanger serves as an evaporator; operating the compressor; fully closing the first regulating valve; and controlling an opening degree of the injection regulating valve.
  • EP 3 418 655 A1 describes a refrigeration apparatus which, even if refrigerant leakage occurs, can keep the extent of the refrigerant leakage small, effectively utilize portions in which leakage is not occurring, and inhibit contamination of a refrigerant circuit with air.
  • a controller closes a shutoff valve on the upstream side of a usage-side heat exchanger of the leaking unit and performs control so as to ensure a state in which, with respect to a check valve on the downstream side of the usage-side heat exchanger of the leaking unit, the refrigerant pressure on the downstream side is greater than the refrigerant pressure on the leaking unit usage-side heat exchanger side.
  • EP 2 808 621 A1 describes an air-conditioning apparatus that includes an outdoor-side flow rate control device (a fourth flow rate control device) that generates an intermediate pressure for injection into a compressor, and a bypass flow rate control device (a sixth flow rate control device) that is placed at a bypass pipe allowing bypassing of an outdoor heat exchanger in parallel to the outdoor-side flow rate control device and that controls the amount of heat exchange of the outdoor heat exchanger together with the outdoor-side flow rate control device.
  • a fourth flow rate control device that generates an intermediate pressure for injection into a compressor
  • a bypass flow rate control device (a sixth flow rate control device) that is placed at a bypass pipe allowing bypassing of an outdoor heat exchanger in parallel to the outdoor-side flow rate control device and that controls the amount of heat exchange of the outdoor heat exchanger together with the outdoor-side flow rate control device.
  • the present invention provides an air conditioning apparatus as defined in appended claim 1.
  • the present invention it is possible to prevent reduction in the refrigerant pressure in the liquid-side pipe on the downstream side relative to the first regulating valve, increase the evaporation temperature to prevent increase in the temperature difference from indoor air, reduce the discharge temperature from the compressor, and thus reliably perform refrigerant recovery even when the outside temperature is high.
  • the air conditioning apparatus includes: an outdoor unit including a compressor and an outdoor heat exchanger; an indoor unit including an indoor heat exchanger; a refrigerant pipe connecting the outdoor unit and the indoor unit and including a liquid-side pipe and a gas-side pipe; circuit switching means disposed on the refrigerant pipe; a first regulating valve disposed on the refrigerant pipe; and a control unit; the air conditioning apparatus further including: an injection pipe connecting an injection port of the compressor and the refrigerant pipe between the first regulating valve and the indoor heat exchanger; and an injection regulating valve disposed on the injection pipe.
  • the control unit executes a first refrigerant recovery operation including: controlling the circuit switching means so that the outdoor heat exchanger serves as a radiator and the indoor heat exchanger serves as an evaporator; operating the compressor; fully closing the first regulating valve; and controlling an opening degree of the injection regulating valve.
  • the control unit controls the opening degree of the injection regulating valve so that a refrigerant discharge temperature of a refrigerant discharged from the compressor becomes equal to or lower than a first predetermined temperature.
  • the air conditioning apparatus further includes a second regulating valve disposed on the refrigerant pipe between a connection point of the injection pipe and the indoor heat exchanger, and the control unit executes, when a refrigerant discharge pressure of a refrigerant discharged from the compressor becomes equal to or higher than a first predetermined pressure, a second refrigerant recovery operation including: closing the second regulating valve; and opening the first regulating valve.
  • the air conditioning apparatus further includes an injection heat exchanger configured to exchange heat between the refrigerant flowing between the first regulating valve and the connection point of the injection pipe and the refrigerant flowing between the injection port and the injection regulating valve.
  • the air conditioning apparatus further includes: a bypass pipe having one end connected to the refrigerant pipe between the outdoor heat exchanger and the second regulating valve and the other end connected to the refrigerant pipe between the circuit switching means and a suction side of the compressor; a bypass regulating valve disposed on the bypass pipe; and a refrigerant storage unit disposed between the other end of the bypass pipe and the compressor.
  • the control unit executes, when the refrigerant discharge pressure of the refrigerant discharged from the compressor is equal to or higher than a second predetermined pressure, a third refrigerant recovery operation including opening the bypass regulating valve.
  • Fig. 1 is a refrigerant circuit diagram showing a first embodiment of an air conditioning apparatus according to the present invention.
  • an air conditioning apparatus 1 in the present embodiment includes an outdoor unit 10 and an indoor unit 20.
  • the outdoor unit 10 includes a compressor 11, a four-way valve 12 as the circuit switching means, an outdoor heat exchanger 13, a first regulating valve 14, and a gas-side pipe 15 and a liquid-side pipe 16 which connect these components to each other.
  • An outdoor fan 17 is disposed near the outdoor heat exchanger 13 to send outside air to the outdoor heat exchanger 13.
  • the indoor unit 20 includes an indoor heat exchanger 21, and the indoor unit 20 and the outdoor unit 10 are connected with each other by the gas-side pipe 15 and the liquid-side pipe 16.
  • An indoor fan 22 is disposed near the indoor heat exchanger 21 to send indoor air to the indoor heat exchanger 21.
  • the compressor 11 is configured to compress a gas refrigerant sucked through the gas-side pipe 15 to a predetermined pressure and discharge the compressed gas refrigerant, and the compressed gas refrigerant is fed to the outdoor heat exchanger 13 through the four-way valve 12 in a cooling operation.
  • the outdoor heat exchanger 13 exchanges heat between outside air and the refrigerant by driving the outdoor fan 17, and is configured to function as a condenser in the cooling operation and function as an evaporator in a heating operation.
  • the first regulating valve 14 is disposed on the liquid-side pipe 16, and decompresses and expands the refrigerant flowing into the indoor heat exchanger 21 in the cooling operation.
  • the indoor heat exchanger 21 performs heat exchange of indoor air by driving the indoor fan 22, and is configured to function as an evaporator in the cooling operation and function as a condenser in the heating operation.
  • an injection pipe 30 is connected, at one end thereof, between the first regulating valve 14 and the indoor heat exchanger 21, and the other end of the injection pipe 30 is connected to an injection port 31 at an intermediate pressure in a compression space of the compressor 11.
  • An injection regulating valve 32 is disposed midway of the injection pipe 30.
  • a second regulating valve 33 is disposed between the first regulating valve 14 and the indoor heat exchanger 21 at a position closer to the indoor heat exchanger 21 than the connection point of the injection pipe 30 is.
  • each of the first regulating valve 14, the injection regulating valve 32, and the second regulating valve 33 includes a motor-operated valve having an opening degree adjustable in any manner.
  • a discharge temperature sensor 35 which detects a refrigerant discharge temperature and a discharge pressure sensor 36 which detects a refrigerant discharge pressure are disposed at a refrigerant discharge side of the compressor 11.
  • a suction pressure sensor 37 which detects a refrigerant suction pressure is disposed at a refrigerant suction side of the compressor 11.
  • Fig. 2 is a block diagram showing the control configuration of the first embodiment.
  • the air conditioning apparatus 1 of the present embodiment includes a control unit 40.
  • the control unit 40 includes, for example, a processor, such as a CPU or an MPU, and a memory device, such as a ROM or a RAM, and controls each part of the air conditioning apparatus 1.
  • the discharge temperature sensor 35, the discharge pressure sensor 36, and the suction pressure sensor 37 are connected to the control unit 40.
  • the control unit 40 is configured to control, based on detection values of the discharge temperature sensor 35, the discharge pressure sensor 36, and the suction pressure sensor 37, driving of the compressor 11, the outdoor fan 17, and the indoor fan 22, the opening degrees of the first regulating valve 14, the second regulating valve 33, and the injection regulating valve 32, and switching of the four-way valve 12.
  • Fig. 3 is a flowchart showing the refrigerant recovery operation in the present embodiment.
  • the control unit 40 when starting the refrigerant recovery operation, the control unit 40 performs a first refrigerant recovery operation (ST1).
  • the first refrigerant recovery operation includes: switching the four-way valve 12 to the cooling operation; fully closing the first regulating valve 14; fixing the second regulating valve 33 at a predetermined opening degree; and fixing the operation frequency of the compressor 11.
  • control unit 40 acquires a refrigerant discharge temperature Td of the compressor 11 detected by the discharge temperature sensor 35 and determines whether the refrigerant discharge temperature Td is equal to or higher than a first predetermined temperature T1 (ST2).
  • the control unit 40 When the refrigerant discharge temperature Td is equal to or higher than the first predetermined temperature T1 (ST2: YES), the control unit 40 performs control to increase the opening degree of the injection regulating valve 32 (ST3).
  • the pressure of the low-pressure refrigerant on the upstream side of the indoor heat exchanger 21 gradually decreases by performing the refrigerant recovery operation.
  • the evaporation temperature in the indoor heat exchanger 21 decreases, the temperature difference from indoor air increases, and the superheat degree thus increases at an outlet of the indoor heat exchanger 21.
  • the temperature of the refrigerant discharged from the compressor 11 also increases.
  • the temperature of the refrigerant discharged from the compressor 11 reaches the vicinity of an upper limit (e.g., 100°C) even in the cooling operation.
  • allowing the intermediate-pressure refrigerant in the compressor 11 to flow to the liquid-side pipe 16 from the compressor 11 through the injection pipe 30 makes it possible to prevent reduction in the refrigerant pressure in the liquid-side pipe 16 on the downstream side relative to the first regulating valve 14, increase the evaporation temperature in the indoor heat exchanger 21 to prevent increase in the temperature difference from indoor air, and largely reduce the discharge temperature from the compressor 11.
  • control unit 40 acquires a suction pressure Ps of the compressor 11 detected by the suction pressure sensor 37 and determines whether the refrigerant suction pressure Ps is equal to or lower than -0.1 Mpa (ST4).
  • the control unit 40 ends the refrigerant recovery operation.
  • the control unit 40 When it is determined that the suction pressure Ps is not equal to or lower than -0.1 Mpa (ST4: NO), the control unit 40 returns to step 2 to determine whether the refrigerant discharge temperature Td is equal to or higher than the first predetermined temperature T1 (ST2).
  • the control unit 40 determines whether the refrigerant discharge temperature Td is equal to or lower than the first predetermined temperature T1 - 30°C (ST5).
  • the control unit 40 When it is determined that the refrigerant discharge temperature Td is equal to or lower than the first predetermined temperature T1 - 30°C (ST5: YES), the control unit 40 performs control to reduce the opening degree of the injection regulating valve 32 (ST6).
  • control unit 40 When it is determined that the refrigerant discharge temperature Td is not equal to or lower than the first predetermined temperature T1 - 30°C (ST5: NO), the control unit 40 performs control to maintain the opening degree of the injection regulating valve 32 (ST7).
  • control unit 40 After controlling the opening degree of the injection regulating valve 32, the control unit 40 shifts to step 4 to determine whether the refrigerant suction pressure Ps is equal to or lower than -0.1 Mpa (ST4).
  • the air conditioning apparatus 1 further includes the injection pipe 30 connecting the injection port 31 of the compressor 11 and the refrigerant pipe between the first regulating valve 14 and the indoor heat exchanger 21, and the injection regulating valve 32 disposed on the injection pipe 30.
  • the control unit 40 executes the first refrigerant recovery operation including: controlling the four-way valve 12 (circuit switching means) so that the outdoor heat exchanger 13 serves as a radiator and the indoor heat exchanger 21 serves as an evaporator; operating the compressor 11; fully closing the first regulating valve 14; and controlling the opening degree of the injection regulating valve 32.
  • Fig. 4 is a refrigerant circuit diagram showing the second embodiment of the present invention.
  • an air conditioning apparatus 1 includes an injection heat exchanger 34 which exchanges heat between the refrigerant flowing between a first regulating valve 14 and a connection point of an injection pipe 30 and the refrigerant flowing between an injection port 31 and an injection regulating valve 32.
  • Fig. 5 is a flowchart showing the refrigerant recovery operation of the present embodiment.
  • the control unit 40 when starting the refrigerant recovery operation, the control unit 40 performs a first refrigerant recovery operation.
  • the first refrigerant recovery operation is similar to the operations from step (ST1) to step (ST7) of the flowchart shown in Fig. 3 .
  • identical step numbers designate identical steps to omit description thereof.
  • the control unit 40 determines whether a refrigerant discharge pressure Pd is equal to or higher than a first predetermined pressure Pd1 (ST8).
  • the control unit 40 performs a second refrigerant recovery operation (ST9).
  • the second refrigerant recovery operation includes: switching the four-way valve 12 to the cooling operation; fixing the first regulating valve 14 to a predetermined opening degree; fully closing the second regulating valve 33; and fixing the operation frequency of the compressor 11.
  • control unit 40 acquires a refrigerant discharge temperature Td of the compressor 11 detected by the discharge temperature sensor 35 and determines whether the refrigerant discharge temperature Td is equal to or higher than a second predetermined temperature T2 (ST10).
  • control unit 40 When the refrigerant discharge temperature Td is equal to or higher than the second predetermined temperature T2 (ST10: YES), the control unit 40 performs control to increase the opening degree of the injection regulating valve 32 (ST11).
  • control unit 40 determines whether the refrigerant discharge temperature Td is equal to or lower than the first predetermined temperature T1 - 30°C (ST12).
  • control unit 40 When it is determined that the refrigerant discharge temperature Td is equal to or lower than the first predetermined temperature T1 - 30°C (ST12: YES), the control unit 40 performs control to reduce the opening degree of the injection regulating valve 32 (ST13).
  • control unit 40 When it is determined that the refrigerant discharge temperature Td is not equal to or lower than the first predetermined temperature T1 - 30°C (ST12: NO), the control unit 40 performs control to maintain the opening degree of the injection regulating valve 32 (ST14).
  • control unit 40 After controlling the opening degree of the injection regulating valve 32, the control unit 40 shifts to step 4 to determine whether the refrigerant suction pressure Ps is equal to or lower than -0.1 Mpa (ST4).
  • the air conditioning apparatus 1 includes the second regulating valve 33 disposed on the refrigerant pipe between the connection point of the injection pipe 30 and the indoor heat exchanger 21.
  • the control unit 40 executes the second refrigerant recovery operation including: closing the second regulating valve 33; and opening the first regulating valve 14.
  • the air conditioning apparatus 1 includes the injection heat exchanger 34 which exchanges heat between the refrigerant flowing between the first regulating valve 14 and the connection point of the injection pipe 30 and the refrigerant flowing between the injection port 31 and the injection regulating valve 32.
  • Fig. 6 is a refrigerant circuit diagram showing the third embodiment of the present invention.
  • a bypass pipe 50 is provided.
  • One end of the bypass pipe 50 is connected to a refrigerant pipe between an outdoor heat exchanger 13 and a second regulating valve 33, and the other end thereof is connected to the refrigerant pipe between a four-way valve 12 and a suction side of a compressor 11.
  • a bypass regulating valve 51 is disposed midway of the bypass pipe 50.
  • a refrigerant storage unit 52 is disposed on the bypass pipe 50 between a connection point of a gas-side pipe 15 and the compressor 11.
  • Fig. 7 is a block diagram showing a control configuration of the third embodiment.
  • a control unit 40 is configured to control, based on detection values of a discharge temperature sensor 35, a discharge pressure sensor 36, and a suction pressure sensor 37, driving of the compressor 11, an outdoor fan 17, and an indoor fan 22, the opening degrees of a first regulating valve 14, a second regulating valve 33, an injection regulating valve 32, and the bypass regulating valve 51, and switching of the four-way valve 12.
  • Fig. 8 is a flowchart showing the refrigerant recovery operation of the present embodiment.
  • the control unit 40 when starting the refrigerant recovery operation, the control unit 40 performs a first refrigerant recovery operation.
  • the first refrigerant recovery operation is similar to the operations from step (ST1) to step (ST14) of the flowchart shown in Fig. 5 .
  • identical step numbers designate identical steps to omit description thereof.
  • the control unit 40 determines whether the refrigerant discharge pressure Pd of the compressor 11 is equal to or higher than a second predetermined pressure Pd2 (ST15).
  • the control unit 40 performs a second refrigerant recovery operation (ST9).
  • the second refrigerant recovery operation is similar to that of the second embodiment.
  • the control unit 40 performs a third refrigerant recovery operation (ST16).
  • the third refrigerant recovery operation includes: switching the four-way valve 12 to the cooling operation: fixing the first regulating valve 14 to a predetermined opening degree; fully closing the second regulating valve 33; increasing the opening degree of the bypass regulating valve 51; and fixing the operation frequency of the compressor 11.
  • control unit 40 determines whether the refrigerant discharge pressure Pd of the compressor 11 is equal to or higher than the second predetermined pressure Pd2 + 0.1 Mpa (ST17) and ends the refrigerant recovery operation when it is determined that the refrigerant discharge pressure Pd of the compressor 11 is equal to or higher than the second predetermined pressure Pd2 + 0.1 Mpa (ST17: YES).
  • the control unit 40 When it is determined that the refrigerant discharge pressure Pd of the compressor 11 is not equal to or higher than the second predetermined pressure Pd2 + 0.1 Mpa (ST17: NO), the control unit 40 returns to step 4 (ST4).
  • the air conditioning apparatus 1 includes the bypass pipe 50 having one end connected to the refrigerant pipe between the outdoor heat exchanger 13 and the second regulating valve 33 and the other end connected to the refrigerant pipe between the four-way valve 12 and the suction side of the compressor 11, the bypass regulating valve 51 disposed on the bypass pipe 50, and the refrigerant storage unit 52 disposed between the other end of the bypass pipe 50 and the compressor 11.
  • the control unit 40 executes the third refrigerant recovery operation including opening the bypass regulating valve 51.
  • the air conditioning apparatus according to the present invention is suitably usable as an air conditioning apparatus capable of reliably performing refrigerant recovery even when the outside temperature is high.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Claims (4)

  1. Appareil de climatisation comprenant :
    une unité extérieure (10) comprenant un compresseur (11) et un échangeur de chaleur extérieur (13) ;
    une unité intérieure (20) comprenant un échangeur de chaleur intérieur (21) ;
    un tuyau à fluide frigorigène raccordant l'unité extérieure et l'unité intérieure et comprenant un tuyau côté liquide (15) et un tuyau côté gaz (15) ;
    un moyen de commutation de circuit disposé sur le tuyau à fluide frigorigène ;
    une première vanne de régulation (14) disposée sur le tuyau à fluide frigorigène ;
    une unité de commande (40) ;
    un tuyau d'injection (30) raccordant un orifice d'injection (31) du compresseur et le tuyau à fluide frigorigène entre la première vanne de régulation et l'échangeur de chaleur intérieur ; et
    une vanne de régulation d'injection (32) disposée sur le tuyau d'injection,
    l'unité de commande exécutant une première opération de récupération de fluide frigorigène comprenant : la commande du moyen de commutation de circuit de telle sorte que l'échangeur de chaleur extérieur sert de radiateur et l'échangeur de chaleur intérieur sert d'évaporateur ; le fonctionnement du compresseur ; la fermeture complète de la première vanne de régulation ; et la commande d'un degré d'ouverture de la vanne de régulation d'injection,
    l'appareil de climatisation comprenant une deuxième vanne de régulation (33) disposée sur le tuyau à fluide frigorigène entre un point de raccordement du tuyau d'injection et l'échangeur de chaleur intérieur,
    l'unité de commande exécutant, lorsqu'une pression d'évacuation de fluide frigorigène d'un fluide frigorigène évacué du compresseur devient égale ou supérieure à une première pression prédéterminée, une deuxième opération de récupération de fluide frigorigène comprenant : la fermeture de la deuxième vanne de régulation ; et l'ouverture de la première vanne de régulation.
  2. Appareil de climatisation selon la revendication 1, l'unité de commande commandant, dans la première opération de récupération de fluide frigorigène, le degré d'ouverture de la vanne de régulation d'injection de telle sorte qu'une température d'évacuation de fluide frigorigène d'un fluide frigorigène évacué du compresseur devient égale ou inférieure à une première température prédéterminée.
  3. Appareil de climatisation selon la revendication 1 ou 2, comprenant en outre un échangeur de chaleur d'injection (34) conçu pour échanger de la chaleur entre le fluide frigorigène s'écoulant entre la première vanne de régulation et le point de raccordement du tuyau d'injection et le fluide frigorigène s'écoulant entre l'orifice d'injection et la vanne de régulation d'injection.
  4. Appareil de climatisation selon l'une quelconque des revendications 1 à 3, comprenant en outre :
    un tuyau de dérivation (50) présentant une extrémité raccordée au tuyau à fluide frigorigène entre l'échangeur de chaleur extérieur et la deuxième vanne de régulation et l'autre extrémité raccordée au tuyau à fluide frigorigène entre le moyen de commutation de circuit et un côté aspiration du compresseur ;
    une vanne de régulation de dérivation (51) disposée sur le tuyau de dérivation ; et
    une unité de stockage de fluide frigorigène (52) disposée entre l'autre extrémité du tuyau de dérivation et le compresseur,
    l'unité de commande exécutant, lorsque la pression d'évacuation de fluide frigorigène du fluide frigorigène évacué du compresseur est égale ou supérieure à une deuxième pression prédéterminée, une troisième opération de récupération de fluide frigorigène comprenant l'ouverture de la vanne de régulation de dérivation.
EP21158549.2A 2020-02-25 2021-02-22 Appareil de conditionnement d'air Active EP3872423B1 (fr)

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Publication number Priority date Publication date Assignee Title
JP3505209B2 (ja) * 1993-11-30 2004-03-08 三洋電機株式会社 冷凍装置
JP5409715B2 (ja) * 2011-07-04 2014-02-05 三菱電機株式会社 空気調和装置
WO2013111176A1 (fr) * 2012-01-23 2013-08-01 三菱電機株式会社 Dispositif de climatisation
JP6075264B2 (ja) * 2013-10-09 2017-02-08 株式会社富士通ゼネラル 空気調和機
EP3279580B1 (fr) * 2015-04-03 2022-09-07 Mitsubishi Electric Corporation Dispositif de climatisation
JP6156528B1 (ja) * 2016-02-16 2017-07-05 ダイキン工業株式会社 冷凍装置
JP2018009767A (ja) * 2016-07-15 2018-01-18 ダイキン工業株式会社 冷凍装置
WO2018167820A1 (fr) * 2017-03-13 2018-09-20 三菱電機株式会社 Dispositif à cycle de réfrigération
JP6935720B2 (ja) 2017-10-12 2021-09-15 ダイキン工業株式会社 冷凍装置

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JP2021134949A (ja) 2021-09-13

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