WO2020141582A1 - 空気調和機及び流路切換弁 - Google Patents

空気調和機及び流路切換弁 Download PDF

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Publication number
WO2020141582A1
WO2020141582A1 PCT/JP2019/045808 JP2019045808W WO2020141582A1 WO 2020141582 A1 WO2020141582 A1 WO 2020141582A1 JP 2019045808 W JP2019045808 W JP 2019045808W WO 2020141582 A1 WO2020141582 A1 WO 2020141582A1
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WIPO (PCT)
Prior art keywords
port
flow path
refrigerant
switching valve
circuit
Prior art date
Application number
PCT/JP2019/045808
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
重貴 脇坂
Original Assignee
ダイキン工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to CN201980087572.9A priority Critical patent/CN113227663B/zh
Priority to EP19908011.0A priority patent/EP3889515A4/en
Publication of WO2020141582A1 publication Critical patent/WO2020141582A1/ja
Priority to US17/356,910 priority patent/US20210318041A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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
    • F25B2313/005—Outdoor unit expansion valves
    • 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
    • F25B2313/006—Compression machines, plants or systems with reversible cycle not otherwise provided for two pipes connecting the outdoor side to the indoor side with multiple indoor units
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • 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
    • F25B2313/029—Control issues
    • F25B2313/0292—Control issues related to reversing valves
    • 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
    • F25B2500/222—Detecting refrigerant leaks
    • 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
    • F25B2600/2515—Flow valves

Definitions

  • the present disclosure relates to an air conditioner and a flow path switching valve.
  • Patent Document 1 discloses an air conditioner including an indoor unit and an outdoor unit. A solenoid valve and an expansion valve are connected to the refrigerant pipe connected to the indoor unit. When the refrigerant leak detector detects the refrigerant leak in the indoor unit, the solenoid valve and the expansion valve are closed.
  • the solenoid valve and the expansion valve as disclosed in Patent Document 1 have a structure in which the internal flow path is opened and closed by a valve. Therefore, the internal flow path is relatively narrow due to its structure.
  • the shutoff valve as disclosed in Patent Document 1 is in a closed state at the time of refrigerant leakage, but is basically in an open state in other normal operations. For this reason, there is a problem that the pressure loss of the refrigerant channel in the normal operation increases due to the provision of the shutoff valve.
  • the present disclosure is to reduce the pressure loss due to the shutoff valve.
  • the first aspect includes a heat source circuit (20a) to which the compressor (21) and the heat source heat exchanger (22) are connected, and a utilization circuit (30a) to which the utilization heat exchanger (31) is connected,
  • An air conditioner including a refrigerant circuit (10a) in which a refrigeration cycle is performed, wherein the refrigerant circuit (10a) has refrigerant flow paths (41, 42) connected to both ends of the utilization circuit (30a). Further comprising a shut-off valve connected to each of the two refrigerant flow paths (41, 42), at least one of the two shut-off valves being configured to operate when the refrigerant leaks in the utilization circuit (30a).
  • An air conditioner comprising flow passage switching valves (V1, V2) for switching the flow passages so as to block the refrigerant flow passages (41, 42).
  • the shutoff valve is composed of the flow path switching valves (V1, V2), the pressure loss due to the shutoff valve can be reduced as compared with, for example, a solenoid valve or an expansion valve.
  • a second aspect is the first aspect in which in the first aspect, the refrigerant flow passages (41, 42) are formed on the heat source circuit (20a) side in the flow passage switching valves (V1, V2) ( 41a, 42a) and a second flow path (41b, 42b) formed on the utilization circuit (30a) side of the flow path switching valves (V1, V2), the flow path switching valves (V1, V2) ) Is a first port (P1) connected to the first flow path (41a, 42a), a second port (P2) connected to the second flow path (41b, 42b), and a third port (P3). ) And a four-way switching valve (51, 52) having a fourth port (P4).
  • the flow path switching valves (V1, V2) are composed of four-way switching valves (51, 52).
  • the four-way switching valve (51, 52) is set to the first state, the refrigerant flow passages (41, 42) are electrically connected.
  • each refrigerant flow path (41, 42) is shut off.
  • a third aspect is the second aspect, wherein the refrigerant circuit (10a) has a high-pressure introduction circuit (60) for introducing the high-pressure refrigerant of the first flow path (41a, 42a) to the third port (P3).
  • the air conditioner is characterized in that the four-way switching valve (51, 52) is of a differential pressure drive type using a high pressure refrigerant introduced into the third port (P3) as a drive source.
  • the high pressure refrigerant flowing through the first flow path (41a, 42a) is introduced into the third port (P3).
  • the flow path of the four-way switching valve (51, 52) is switched by using the pressure of this high-pressure refrigerant as a drive source.
  • a fourth aspect is the third refrigeration cycle of the third aspect, wherein the refrigerant circuit (10a) uses the heat source heat exchanger (22) as a radiator and the utilization heat exchanger (31) is an evaporator. And a second refrigeration cycle in which the utilization heat exchanger (31) is a radiator and the heat source heat exchanger (22) is an evaporator, and the high pressure introduction circuit (60) is at least 2
  • One of the first flow paths (41a, 42a) is configured to introduce a high-pressure refrigerant in a high pressure first flow path (41a, 42a) into the third port (P3). It is an air conditioner.
  • a high-pressure high-pressure refrigerant can be introduced into the third port (P3) in both the first refrigeration cycle and the second refrigeration cycle.
  • This high-pressure refrigerant can be used as a drive source for the four-way switching valve (51, 52).
  • a fifth aspect is the fourth aspect, wherein the high-pressure introduction circuit (60) includes a first flow path (41a, 42a) of the liquid-side refrigerant flow path (41) and the third port (P3).
  • Liquid side introduction path (61) for communicating with each other, and a gas side introduction path (62) for communicating the first flow path (41a, 42a) of the gas side refrigerant flow path (42) with the third port (P3).
  • a first opening/closing valve (64) that is opened during the first refrigeration cycle is provided in the liquid side introduction path (61), and the second side is provided in the gas side introduction path (62).
  • the air conditioner is provided with a second opening/closing valve (65) that is opened during the refrigeration cycle.
  • the high-pressure liquid refrigerant can be introduced into the third port (P3) by opening the first opening/closing valve (64) during the first refrigeration cycle.
  • the high-pressure gas refrigerant can be introduced into the third port (P3) by opening the second opening/closing valve (65) during the second refrigeration cycle.
  • the four-way switching valve (51, 52) has a closed fourth port (P4), and the four-way switching valve in the first state.
  • (51, 52) connects the first port (P1) and the second port (P2) and the third port (P3) and the fourth port (P4),
  • the four-way switching valve (51, 52) in the second state allows the first port (P1) and the third port (P3) to communicate with each other and the second port (P2) and the fourth port (P4) to communicate with each other. It is characterized by
  • the first port (P1) and the second port (P2) are in communication with each other and the refrigerant flow paths (41, 42) are in conduction. ..
  • the refrigerant on the third port (P3) side does not pass through the closed fourth port (P4).
  • the utilization circuit (30a) is substantially blocked by the fourth port (P4).
  • the utilization circuit (30a) is a closed circuit.
  • the four-way switching valve (51, 52) has a low pressure pipe (55, 56) communicating with the utilization circuit (30a), The air conditioner is switched to a second state by a pressure difference between a high pressure refrigerant and an internal pressure of the low pressure pipes (55, 56).
  • the internal pressure of the utilization circuit (30a) will decrease, which in turn lowers the internal pressure of the low pressure pipes (55,56).
  • the four-way switching valve (51, 52) switches to the second state by utilizing the differential pressure between the high pressure refrigerant and the internal pressure of the low pressure pipe (55, 56) in this state.
  • the four-way switching valve (51, 52) can be automatically switched to the second state.
  • An eighth aspect is the first aspect in which, in the first aspect, the refrigerant flow passages (41, 42) are formed on the heat source circuit (20a) side in the flow passage switching valves (V1, V2). 41a, 42a) and a second flow path (41b, 42b) formed on the utilization circuit (30a) side of the flow path switching valves (V1, V2), the flow path switching valves (V1, V2) ) Is a first port (P1) connected to the first flow path (41a, 42a), a second port (P2) connected to the second flow path (41b, 42b), and an internal flow path (77).
  • an electric motor (75) that rotationally drives the rotating part (76), the rotating part (V1, V2) of the flow path switching valve (V1, V2) 76) is a rotation angle position in a first state in which the first port (P1) and the second port (P2) communicate with each other via the internal flow path (77), and the first port (P1) and The rotation angle position is in the second state in which the second port (P2) is closed.
  • the rotation angle position of the rotating portion (76) is changed by the electric motor (75), so that the electric rotary type flow path switching valve (V1, V2) is brought into the first state and the second state. Can be switched.
  • the flow passage switching valve (V1, V2) is an electrically driven three-way switching valve (71, 72) having a closed third port (P3).
  • the rotating portion (76) of the three-way switching valve (71, 72) in the first state is connected to the first port (P1) and the second port (P2) via the internal flow path (77).
  • the rotary portion (76) of the three-way switching valve (71, 72) in the second state has one of the first port (P1) and the second port (P2). It is in communication with the third port (P3) through the internal flow path (77), and the other of the first port (P1) and the second port (P2) is in the rotation angle position where it is blocked by the rotating portion (76).
  • the rotation angle position of the rotating portion (76) is changed by the electric motor (75), so that the electric rotary type three-way switching valve (71, 72) is switched between the first state and the second state.
  • the flow passage switching valve (V1, V2) is configured such that the refrigerant flow on the gas side of the two refrigerant flow passages (41, 42).
  • the flow path switching valves (V1, V2) are connected to the gas side refrigerant flow path (42) having a larger pipe diameter than the liquid side refrigerant flow path (41). Therefore, it is possible to suppress a decrease in pressure loss in the refrigerant channel (42) on the gas side.
  • An eleventh aspect is a flow passage switching valve (V1, V2) connected to the refrigerant flow passages (41, 42) of the air conditioner (10) according to any one of the first to tenth aspects. Is a flow path switching valve.
  • FIG. 1 is a piping system diagram showing a schematic configuration of an air conditioner according to an embodiment.
  • FIG. 2 is an enlarged circuit diagram of the interruption unit. It shows the flow of the refrigerant during the normal cooling operation.
  • FIG. 3 is an enlarged circuit diagram of the interruption unit. It represents the flow of the refrigerant during normal heating operation.
  • FIG. 4 is an enlarged circuit diagram of the interruption unit. This shows the state where the refrigerant has leaked.
  • FIG. 5: is the circuit diagram which expanded the interruption
  • FIG. 5(A) shows a normal operation.
  • FIG. 5(B) shows the case of refrigerant leakage.
  • FIG. 6 is an enlarged circuit diagram of the shutoff unit of the third modification.
  • FIG. 5 is the circuit diagram which expanded the interruption
  • FIG. 5(A) shows a normal operation.
  • FIG. 5(B) shows the case of refrigerant leakage.
  • FIG. 6 is an
  • FIG. 6(A) shows a normal operation.
  • FIG. 6(B) shows the time when the refrigerant leaks.
  • FIG. 7: is a piping system figure which shows schematic structure of the air conditioner which concerns on the other 1st example.
  • FIG. 8 is a piping system diagram showing a schematic configuration of an air conditioner according to another second example.
  • FIG. 9 is a table regarding the refrigerants used in the refrigerant circuits of the air conditioners of the embodiment, each modified example, and other embodiments.
  • the air conditioner (10) of the present embodiment performs air conditioning of the indoor space that is the target space.
  • the air conditioner (10) of the present example is configured in a multi-type having an outdoor unit (20) and a plurality of indoor units (30).
  • the air conditioner (10) of this example switches between cooling and heating of the target space.
  • the number of indoor units (30) may be three or more.
  • the outdoor unit (20) is installed outdoors.
  • the outdoor unit (20) constitutes a heat source unit.
  • a heat source circuit (20a) is provided in the outdoor unit (20).
  • Each indoor unit (30) is installed indoors.
  • Each indoor unit (30) constitutes a usage unit.
  • the indoor unit (30) is provided with a utilization circuit (30a).
  • the outdoor unit (20) and the indoor unit (30) are connected to each other via communication pipes (11, 15).
  • the air conditioner (10) has a refrigerant circuit (10a).
  • the refrigerant circuit (10a) is filled with the refrigerant.
  • a vapor compression refrigeration cycle is performed by circulating the refrigerant.
  • the refrigerant circuit (10a) includes a heat source circuit (20a) of the outdoor unit (20) and a plurality of utilization circuits (30a) of each indoor unit (30).
  • a plurality of utilization circuits (30a) are connected in parallel with each other.
  • the heat source circuit (20a) and the plurality of utilization circuits (30a) are connected to each other via communication pipes (11, 15).
  • the communication pipe includes a liquid communication pipe (11) and a gas communication pipe (15).
  • the liquid communication pipe (11) includes a main liquid pipe (12) and a plurality of liquid branch pipes (13). One end of the liquid communication pipe (11) is connected to the liquid shutoff valve (25) of the heat source circuit (20a). One end of the liquid branch pipe (13) is connected to the main liquid pipe (12). The other end of the liquid branch pipe (13) is connected to the liquid end (liquid side joint) of the utilization circuit (30a).
  • the gas communication pipe (15) includes a main gas pipe (16) and a plurality of gas branch pipes (17). One end of the gas communication pipe (15) is connected to the gas shutoff valve (26) of the heat source circuit (20a). One end of the gas branch pipe (17) is connected to the main gas pipe (16). The other end of the gas branch pipe (17) is connected to the gas end (gas side joint) of the utilization circuit (30a).
  • the liquid branch pipe (13) constitutes a liquid refrigerant flow path (41) connected to the liquid end of the utilization circuit (30a).
  • the gas branch pipe (17) constitutes a gas refrigerant flow path (42) connected to the gas end of the utilization circuit (30a).
  • the pipe diameter of the gas refrigerant channel (42) is larger than the pipe diameter of the liquid refrigerant channel (41).
  • the outer diameter of the pipe of the gas refrigerant channel (42) is, for example, 12.7 mm or 15.9 mm.
  • the air conditioner (10) includes one outdoor unit (20).
  • the outdoor unit (20) includes a casing (not shown) that houses the heat source circuit (20a).
  • the heat source circuit (20a) includes a compressor (21), an outdoor heat exchanger (22), an outdoor four-way switching valve (23), an outdoor expansion valve (24), a gas closing valve (26), and a liquid closing valve (25). ) Is connected.
  • the compressor (21) compresses the sucked refrigerant and discharges the compressed refrigerant.
  • the outdoor heat exchanger (22) constitutes a heat source heat exchanger for exchanging heat between the refrigerant and the outdoor air.
  • An outdoor fan (22a) is provided near the outdoor heat exchanger (22). The outdoor fan (22a) conveys outdoor air passing through the outdoor heat exchanger (22).
  • the outdoor four-way switching valve (23) switches between the first state shown by the solid line in FIG. 1 and the second state shown by the broken line in FIG.
  • the outdoor four-way switching valve (23) in the first state connects the discharge side of the compressor (21) and the gas end of the outdoor heat exchanger (22), and the suction side of the compressor (21) and the gas shutoff valve. (26) communicate with.
  • the outdoor four-way switching valve (23) in the second state connects the discharge side of the compressor (21) and the gas closing valve (26), and the suction side of the compressor (21) and the outdoor heat exchanger (22). To communicate with the gas end of.
  • the outdoor expansion valve (24) is connected between the outdoor heat exchanger (22) and the liquid closing valve (25) in the heat source circuit (20a).
  • the outdoor expansion valve (24) is an electronic expansion valve whose opening can be adjusted.
  • An outdoor controller (27) is provided in the outdoor unit (20).
  • the outdoor controller (27) controls constituent devices including the compressor (21), the outdoor expansion valve (24), and the outdoor fan (22a) of the outdoor unit (20).
  • the outdoor controller (27) includes a microcomputer mounted on a control board and a memory device (specifically, a semiconductor memory) that stores software for operating the microcomputer.
  • the air conditioner (10) includes a plurality of indoor units (30).
  • the indoor unit (30) is a ceiling-mounted type.
  • the ceiling-installed type here includes an embedded ceiling type and a suspended ceiling type.
  • the outdoor unit (20) includes a casing (not shown) that houses the utilization circuit (30a).
  • the indoor heat exchanger (31) and the indoor expansion valve (32) are connected to the utilization circuit (30a).
  • the indoor heat exchanger (31) constitutes a utilization heat exchanger for exchanging heat between the refrigerant and the indoor air.
  • An indoor fan (31a) is provided near the indoor heat exchanger (31).
  • the indoor fan (31a) conveys indoor air passing through the indoor heat exchanger (31).
  • the indoor expansion valve (32) is connected between the liquid side joint in the utilization circuit (30a) and the indoor heat exchanger (31).
  • the indoor expansion valve (32) is an electronic expansion valve whose opening can be adjusted.
  • An indoor controller (33) is installed in the indoor unit (30).
  • the indoor controller (33) controls constituent devices including the indoor expansion valve (32) and the indoor fan (31a) of the indoor unit (30).
  • the indoor controller (33) includes a microcomputer mounted on the control board and a memory device (specifically, a semiconductor memory) that stores software for operating the microcomputer.
  • a remote controller (34) is connected to the indoor unit (30). By operating the remote controller (34), the operation mode and set temperature of the corresponding indoor unit (30) can be switched.
  • the indoor unit (30) is equipped with an LED light (not shown).
  • the LED light is turned on when the air conditioner (10) is operating and when the shutoff unit (50) is opened and closed.
  • the lights are turned on differently when the valve is closed and when the valve is opened. By checking the lighting state of the LED, the user can determine whether the shutoff unit (50) (strictly speaking, the flow path switching valve (V1, V2)) is open or closed.
  • the air conditioner (10) includes a refrigerant leak detection sensor (35).
  • the refrigerant leakage detection sensor (35) of this example is provided for each indoor unit (30).
  • the refrigerant leakage detection sensor (35) of this example is arranged inside the casing of the indoor unit (30).
  • the refrigerant leakage detection sensor (35) constitutes a detection unit that detects refrigerant leakage in the utilization circuit (30a) of the corresponding indoor unit (30).
  • the refrigerant leakage detection sensor (35) may be arranged outside the casing of the indoor unit (30).
  • the air conditioner (10) includes a shutoff unit (50).
  • the cutoff unit (50) is configured to cut off the liquid refrigerant flow path (41) and the gas refrigerant flow path (42) when the refrigerant leaks in the corresponding utilization circuit (30a).
  • the shutoff unit (50) includes a liquid refrigerant flow path (41), a gas refrigerant flow path (42), a first flow path switching valve (V1), a second flow path switching valve (V2), and a high pressure introducing circuit. (60) and are included.
  • the first flow path switching valve (V1) is connected to the liquid refrigerant flow path (41).
  • the first flow path switching valve (V1) constitutes a shutoff valve that shuts off the liquid refrigerant flow path (41).
  • the second flow path switching valve (V2) is connected to the gas refrigerant flow path (42).
  • the second flow path switching valve (V2) constitutes a shutoff valve that shuts off the gas refrigerant flow path (42).
  • the first flow path switching valve (V1) and the second flow path switching valve (V2) are arranged outside the casing of the indoor unit (30).
  • the liquid refrigerant flow channel (41) includes a first liquid flow channel (41a) that is a first flow channel and a second liquid flow channel (41b) that is a second flow channel.
  • the first liquid flow path (41a) is formed on the heat source circuit (20a) side in the liquid refrigerant flow path (41).
  • the second liquid flow path (41b) is formed on the utilization circuit (30a) side in the liquid refrigerant flow path (41).
  • the gas refrigerant channel (42) includes a first gas channel (42a) which is a first channel and a second gas channel (42b) which is a second channel.
  • the first gas flow channel (42a) is formed on the heat source circuit (20a) side in the gas refrigerant flow channel (42).
  • the second gas channel (42b) is formed on the utilization circuit (30a) side in the gas refrigerant channel (42).
  • the high pressure introduction circuit (60) includes a liquid side introduction path (61), a gas side introduction path (62), and a main introduction path (63).
  • One end of the liquid side introduction path (61) is connected in the middle of the first liquid flow path (41a).
  • the other end of the liquid-side introduction passage (61) is connected to one end of the main introduction passage (63).
  • One end of the gas side introduction path (62) is connected in the middle of the second gas flow path (42b).
  • the other end of the gas side introduction path (62) is connected to one end of the main introduction path (63).
  • the other end side of the main introduction path (63) branches into a first branch introduction section (63a) and a second branch introduction section (63b).
  • the first check valve (64) permits the flow of the refrigerant from the liquid side introduction passage (61) to the main introduction passage (63) and prohibits the reverse flow of the refrigerant.
  • the second check valve (65) allows the flow of the refrigerant from the gas side introduction path (62) toward the main introduction path (63) and prohibits the reverse flow of the refrigerant.
  • the first flow path switching valve (V1) of this example is composed of a differential pressure driven first four-way switching valve (51).
  • the second flow path switching valve (V2) of this example is composed of a differential pressure drive type second four-way switching valve (52).
  • each four-way switching valve (51, 52) has a first port (P1), a second port (P2), a third port (P3), and a fourth port (P4). I have it.
  • the first port (P1) of the first four-way switching valve (51) is connected to the first liquid flow path (41a).
  • the second port (P2) of the first four-way switching valve (51) is connected to the second liquid flow path (41b).
  • the third port (P3) of the first four-way switching valve (51) communicates with the high pressure introduction circuit (60). Strictly speaking, the third port (P3) of the first four-way switching valve (51) is connected to the first branch introduction section (63a) of the high pressure introduction circuit (60).
  • the fourth port (P4) of the first four-way switching valve (51) is closed by the first closing member (53) (see FIG. 2).
  • the first port (P1) of the second four-way switching valve (52) is connected to the first gas flow path (42a).
  • the second port (P2) of the second four-way switching valve (52) is connected to the second gas flow path (42b).
  • the third port (P3) of the second four-way switching valve (52) communicates with the high pressure introduction circuit (60). Strictly speaking, the third port (P3) of the second four-way switching valve (52) is connected to the second branch introduction section (63b) of the high pressure introduction circuit (60).
  • the fourth port (P4) of the second four-way switching valve (52) is closed by the second closing member (54) (see FIG. 2).
  • Each four-way switching valve (51, 52) is in the first state in which the first port (P1) and the second port (P2) communicate with each other and the third port (P3) and the fourth port (P4) communicate with each other.
  • the second state (the state shown by the solid line in FIG. 1) and the first port (P1) and the third port (P3) communicate with each other and the second port (P2) and the fourth port (P4) communicate with each other ( (State shown by a broken line in FIG. 1).
  • the first four-way switching valve (51) has a first low pressure pipe (55).
  • One end of the first low pressure pipe (55) is connected to the second port (P2) of the first four-way switching valve (51).
  • the first low pressure pipe (55) communicates with the utilization circuit (30a) via the second liquid flow path (41b).
  • the other end of the first low pressure pipe (55) is connected to the pressure chamber inside the first four-way switching valve (51).
  • the second four-way switching valve (52) has a second low pressure pipe (56). One end of the second low pressure pipe (56) is connected to the second port (P2) of the second four-way switching valve (52).
  • the second low pressure pipe (56) communicates with the utilization circuit (30a) via the second gas flow path (42b).
  • the other end of the second low pressure pipe (56) is connected to the pressure chamber inside the second four-way switching valve (52).
  • an internal flow path for connecting the four ports (P1, P2, P3, P4) is shown by a broken line.
  • the shutoff unit (50) has a control unit (57).
  • the control unit (57) includes a microcomputer mounted on the control board and a memory device (specifically, a semiconductor memory) that stores software for operating the microcomputer.
  • the air conditioner (10) performs a cooling operation and a heating operation.
  • the cooling operation and the heating operation during the normal operation in which the refrigerant does not leak will be described with reference to FIG.
  • ⁇ Cooling operation> In the cooling operation, the outdoor four-way switching valve (23) is in the first state, the first four-way switching valve (51) is in the first state, and the second four-way switching valve (52) is in the first state.
  • the outdoor expansion valve (24) is opened.
  • the opening of each indoor expansion valve (32) is controlled based on the degree of superheat of the corresponding indoor heat exchanger (31).
  • the outdoor fan (22a) and the indoor fan (31a) operate.
  • a first refrigeration cycle (cooling cycle) is performed in which the refrigerant radiates and condenses in the outdoor heat exchanger (22) and the refrigerant evaporates in the indoor heat exchanger (31).
  • the refrigerant compressed by the compressor (21) dissipates heat and condenses in the outdoor heat exchanger (22) and passes through the outdoor expansion valve (24).
  • This refrigerant is diverted from the main liquid pipe (12) to each liquid refrigerant flow path (41) and sequentially flows through the first port (P1) and the second port (P2) of the first four-way switching valve (51). It flows into the utilization circuit (30a).
  • the refrigerant is decompressed by the indoor expansion valve (32) and then evaporated in the indoor heat exchanger (31).
  • the indoor heat exchanger (31) air is cooled by the evaporating refrigerant. The cooled air is supplied to the indoor space.
  • each indoor heat exchanger (31) flows through each gas refrigerant flow path (42) and sequentially flows through the second port (P2) and the first port (P1) of the second four-way switching valve (52). ..
  • the refrigerant merges in the main gas pipe (16) and is sucked into the compressor (21).
  • the outdoor four-way switching valve (23) is in the second state
  • the first four-way switching valve (51) is in the first state
  • the second four-way switching valve (52) is in the first state.
  • the opening degree of the outdoor expansion valve (24) is controlled based on the degree of superheat of the refrigerant flowing out of the outdoor heat exchanger (22).
  • the opening degree of each indoor expansion valve (32) is controlled based on the degree of supercooling flowing out of the corresponding indoor heat exchanger (31).
  • the outdoor fan (22a) and the indoor fan (31a) operate.
  • the second refrigeration cycle (heating cycle) is performed in which the refrigerant radiates and condenses in the indoor heat exchanger (31) and the refrigerant evaporates in the indoor heat exchanger (31).
  • the refrigerant compressed by the compressor (21) is branched from the main gas pipe (16) to each gas refrigerant flow path (42), and the first port (P1) and the second port of the second four-way switching valve (52). (P2) in order, and flows into each utilization circuit (30a).
  • each utilization circuit (30a) the refrigerant radiates and condenses in the indoor heat exchanger (31).
  • the indoor heat exchanger (31) air is heated by the heat-releasing refrigerant. The heated air is supplied to the indoor space.
  • Refrigerant radiated in each indoor heat exchanger (31) flows through each liquid refrigerant flow path (41) and then sequentially flows through the second port (P2) and the first port (P1) of the first four-way switching valve (51). ..
  • the refrigerant merges in the main liquid pipe (12) and is decompressed by the outdoor expansion valve (24).
  • the depressurized refrigerant flows through the outdoor heat exchanger (22).
  • the refrigerant absorbs heat from the outdoor air and evaporates. The evaporated refrigerant is sucked into the compressor (21).
  • the first four-way switching valve (51) and the second four-way switching valve (52) of this example are configured to be maintained in the above-mentioned first state during normal operation. Specifically, for example, the spool valve inside each four-way switching valve (51, 52) is pressed by a biasing means such as a high-pressure refrigerant introduced from the third port (P3) or a spring, and the first port (P1). ) And the second port (P2) are communicated with each other, and the third port (P3) and the fourth port (P4) are communicated with each other (see FIGS. 2 and 3).
  • a biasing means such as a high-pressure refrigerant introduced from the third port (P3) or a spring
  • the valve seat portion of the spool valve is preferably made of a resin material having low sliding resistance.
  • the resin material may be Teflon (registered trademark), for example.
  • the high pressure introduction circuit (60) of this example is configured to introduce the high pressure refrigerant to the third port (P3) in both the cooling operation and the heating operation.
  • the high-pressure liquid refrigerant flows through the liquid refrigerant flow path (41), and the low-pressure gas refrigerant after depressurization flows through the gas refrigerant flow path (42). Therefore, in the high-pressure introducing circuit (60) during the cooling operation, the high-pressure liquid refrigerant in the liquid-side introducing passage (61) flows through the open first check valve (64) and passes through the main introducing passage (63). It is introduced into the third port (P3) of each four-way switching valve (51, 52). At this time, the second check valve (65) is basically closed.
  • a high-pressure gas refrigerant flows through the gas refrigerant channel (42) and a liquid refrigerant having a pressure slightly lower than that of the gas refrigerant channel (41) flows. Therefore, in the high-pressure introduction circuit (60) during the heating operation, the high-pressure gas refrigerant in the gas-side introduction passage (62) flows through the second check valve (65) in the open state, and passes through the main introduction passage (63). It is introduced into the third port (P3) of each four-way switching valve (51, 52). At this time, the second check valve (65) is closed or opened.
  • the high-pressure refrigerant that is the drive source for each four-way switching valve (51, 52) can be reliably supplied to the third port (P3).
  • the first four-way switching valve (51) and the second four-way switching valve (52) are in the second state. (See Figure 4).
  • the liquid refrigerant channel (41) and the gas refrigerant channel (42) are shut off.
  • the internal pressure of the usage circuit (30a), the liquid refrigerant flow path (41), and the gas refrigerant flow path (42) will decrease.
  • the internal pressure of the first low pressure pipe (55) decreases as the internal pressure of the liquid refrigerant flow path (41) decreases.
  • the spool valve moves due to the differential pressure between the high pressure refrigerant introduced from the third port (P3) and the internal pressure of the first low pressure pipe (55).
  • the first port (P1) and the third port (P3) communicate with each other, and the second port (P2) and the fourth port ( It is in the second state where it communicates with P4).
  • the liquid refrigerant flow path (41) is shut off by the first four-way switching valve (51).
  • the internal pressure of the second low pressure pipe (56) decreases as the internal pressure of the gas refrigerant flow path (42) decreases.
  • the spool valve moves due to the differential pressure between the high pressure refrigerant introduced from the third port (P3) and the internal pressure of the second low pressure pipe (56).
  • the first port (P1) and the third port (P3) communicate with each other, and the second port (P2) and the fourth port ( It is in the second state where it communicates with P4).
  • the liquid refrigerant flow path (41) is shut off by the first four-way switching valve (51).
  • each of the four-way switching valves (51, 52) of the present embodiment automatically reduces the internal pressure of the low pressure pipes (55, 56) when the refrigerant leaks in the utilization circuit (30a). Switch to 2 states. As a result, the utilization circuit (30a) can be reliably switched to the closed circuit.
  • the refrigerant leak detection sensor (35) detects the refrigerant leak.
  • the indoor controller (33) receives the detection signal of the refrigerant leakage detection sensor (35)
  • a sign indicating this is displayed on the display unit.
  • the display unit may be provided, for example, on the remote controller (34) or on the decorative panel of the indoor unit (30). The display unit switches between the display of the abnormal state where the refrigerant is leaking and the display of the normal state where the refrigerant is not leaking.
  • the embodiment includes a heat source circuit (20a) to which a compressor (21) and an outdoor heat exchanger (22) are connected, and a utilization circuit (30a) to which an indoor heat exchanger (31) is connected.
  • An air conditioner comprising: a refrigerant circuit (10a) for performing the above; an outdoor unit (20) provided with the heat source circuit (20a); and an indoor unit (30) provided with the utilization circuit (30a).
  • the refrigerant circuit (10a) includes refrigerant flow paths (41, 42) connected to both ends of the utilization circuit (30a), and is connected to each of the two refrigerant flow paths (41, 42).
  • a shutoff valve is further provided, and at least one of the two shutoff valves switches the flow passage so as to shut off the refrigerant flow passage (41, 42) when the refrigerant leaks in the utilization circuit (30a). Consists of a directional control valve (V1, V2).
  • the cutoff valves for the liquid refrigerant flow path (41) and the gas refrigerant flow path (42) are composed of flow path switching valves (V1, V2).
  • the flow path switching valves (V1, V2) have a relatively wide flow path compared to solenoid valves and expansion valves due to their structure. In the cooling operation and the heating operation, the pressure loss can be reduced when the refrigerant passes through the flow path switching valves (V1, V2). Therefore, the power consumption of the air conditioner (10) can be reduced.
  • the flow of the refrigerant can be interrupted by switching the flow paths of the flow path switching valves (V1, V2).
  • the refrigerant flow passages (41, 42) include a first flow passage (41a, 42a) formed on the heat source circuit (20a) side of the flow passage switching valve (V1, V2), and the flow passages.
  • the flow path switching valves (V1, V2) are composed of four-way switching valves (51, 52). Due to its structure, the four-way switching valve (51, 52) has a relatively wide flow passage as compared with a solenoid valve or an expansion valve. In the cooling operation and the heating operation, the pressure loss can be reduced when the refrigerant passes through the flow path switching valves (V1, V2). Therefore, the power consumption of the air conditioner (10) can be reduced.
  • the four-way switching valve (51, 52) is connected to a pipe having an outer diameter of 12.7 mm or 15.9 mm as described above. Generally, in the outdoor four-way switching valve (23) of the multi-type air conditioner (10), pipes having the same outer diameter may be connected.
  • the same valve used as the outdoor four-way switching valve (23) can be used as the four-way switching valve (51, 52). Further, the leakage amount of the refrigerant when the valve is closed can be reduced as compared with the case where the solenoid valve or the expansion valve is used as a shutoff valve and connected to a pipe having an outer diameter of 12.7 mm or 15.9 mm.
  • the refrigerant circuit (10a) includes a high pressure introduction circuit (60) for introducing the high pressure refrigerant of the first flow path (41a, 42a) to the third port (P3), and the four-way switching valve ( 51, 52) is a differential pressure drive type using a high pressure refrigerant introduced into the third port (P3) as a drive source.
  • the high pressure refrigerant in the first flow path (41a, 42a) is introduced into the third port (P3) of the four-way switching valve (51, 52).
  • the state of the four-way switching valve (51, 52) can be switched by utilizing the pressure of this high-pressure refrigerant.
  • the refrigerant flow paths (41, 42) can be shut off without using another drive source such as an electric motor.
  • the refrigerant circuit (10a) includes a first refrigeration cycle (cooling cycle) in which the outdoor heat exchanger (22) functions as a radiator and the indoor heat exchanger (31) functions as an evaporator, and the indoor heat The exchanger (31) is a radiator, and the outdoor heat exchanger (22) is configured to perform a second refrigeration cycle (heating cycle) in which the evaporator is an evaporator.
  • a first refrigeration cycle cooling cycle
  • the outdoor heat exchanger (22) is a radiator
  • the outdoor heat exchanger (22) is configured to perform a second refrigeration cycle (heating cycle) in which the evaporator is an evaporator.
  • the high-pressure introduction circuit (60) includes a liquid-side introduction passage (61) for connecting the first liquid passage (41a) of the liquid refrigerant passage (41) and the third port (P3), and a gas.
  • the liquid-side introduction passage (61) includes a gas-side introduction passage (62) for communicating the first gas passage (42a) of the refrigerant passage (42) with the third port (P3).
  • a first check valve (64) that is opened during one refrigeration cycle is provided, and a second check valve (65) that is opened during the second refrigeration cycle is provided in the gas side introduction path (62).
  • the four-way switching valve (51, 52) has the closed fourth port (P4), and the four-way switching valve (51, 52) in the first state is connected to the first port (P1) and the first port (P1).
  • the second port (P2) is in communication with the third port (P3) and the fourth port (P4) are in communication, and the four-way switching valve (51, 52) in the second state is in communication with the first port (P1).
  • the third port (P3) is in communication and the second port (P2) is in communication with the fourth port (P4).
  • the four-way switching valve (51, 52) when the four-way switching valve (51, 52) is in the first state, the first port (P1) and the second port (P2) communicate with each other, and the refrigerant flow paths (41, 42) are in conduction. In this state, cooling operation and heating operation are performed.
  • the second port (P2) When the four-way switching valve (51, 52) is in the second state, the second port (P2) communicates with the closed fourth port (P4). In this state, the liquid refrigerant flow path (41) and the gas refrigerant flow path (42) are blocked, and the utilization circuit (30a) is disconnected from the refrigerant circuit (10a).
  • the four-way switching valve (51, 52) has a low pressure pipe (55, 56) communicating with the utilization circuit (30a), and a high pressure refrigerant and an internal pressure of the low pressure pipe (55, 56) The second state is switched by the differential pressure.
  • the internal pressure of the usage circuit (30a) will drop.
  • the internal pressure of the low pressure pipes (55, 56) decreases.
  • the four-way switching valve (51, 52) the differential pressure between the high-pressure refrigerant and the internal pressure of the low-pressure pipe (55, 56) increases, and the four-way switching valve (51, 52) in the first state switches to the second state.
  • the four-way switching valve (51, 52) automatically switches to the second state as the refrigerant in the utilization circuit (30a) leaks.
  • the flow path switching valves (V1, V2) are at least connected to the gas refrigerant flow path (42) of the two refrigerant flow paths (41, 42).
  • the pipe diameter of the gas refrigerant channel (42) is larger than the pipe diameter of the liquid refrigerant channel (41). Therefore, by providing the flow path switching valves (V1, V2) in the gas refrigerant flow path (42), it is possible to effectively suppress an increase in pressure loss due to the shutoff valve.
  • the first check valve (64), which is the first opening/closing valve, is provided in the liquid side introduction path (61) of the high pressure introduction circuit (60).
  • a second check valve (65), which is a second opening/closing valve, is provided in the gas side introduction path (62) of the high pressure introduction circuit (60).
  • the first opening/closing valve is a first electromagnetic opening/closing valve.
  • the second opening/closing valve is a second electromagnetic opening/closing valve.
  • the first electromagnetic on-off valve is opened during the first refrigeration cycle (cooling cycle) and closed during the second refrigeration cycle (heating cycle).
  • the second electromagnetic opening/closing valve is closed during the first refrigeration cycle (cooling cycle) and closed during the second refrigeration cycle (heating cycle).
  • the high-pressure refrigerant having a high pressure can be introduced into the third port (P3) of the four-way switching valve (51, 52) in both the cooling operation and the heating operation.
  • Modification 2 shown in FIG. 5 differs from the above embodiment in the configuration of the blocking unit (50).
  • the shutoff valve of the shutoff unit (50) is composed of three-way switching valves (71, 72).
  • the three-way switching valve (71, 72) in this example is an electric rotary type so-called rotary valve.
  • a first three-way switching valve (71) is connected to the liquid refrigerant flow path (41).
  • the second three-way switching valve (72) is connected to the gas refrigerant channel (42).
  • Each three-way switching valve (71, 72) has a first port (P1), a second port (P2), and a third port (P3).
  • the first port (P1) of the first three-way switching valve (71) is connected to the first liquid flow path (41a).
  • the second port (P2) of the first three-way switching valve (71) is connected to the second liquid flow path (41b).
  • the third port (P3) of the first three-way switching valve (71) is closed by the third closing member (83).
  • the first port (P1) of the second three-way switching valve (72) is connected to the first gas flow path (42a).
  • the second port (P2) of the second three-way switching valve (72) is connected to the second gas flow path (42b).
  • the third port (P3) of the second three-way switching valve (72) is closed by the fourth closing member (84).
  • Each of the three-way switching valves (71, 72) has an electric motor (75), a rotating portion (76) that is rotationally driven by the electric motor (75), and a case (78) that houses the rotating portion (76). ..
  • the case (78) is formed with the above-mentioned first port (P1), second port (P2), and third port (P3).
  • An internal flow path (77) is formed in the rotating portion (76).
  • the internal flow path (77) of this example is formed in a substantially L-shape when viewed from a cross section perpendicular to the axis.
  • Each three-way switching valve (71, 72) is switched between a first state in which the refrigerant flow paths (41, 42) are in conduction and a second state in which the refrigerant flow paths (41, 42) are shut off.
  • the control unit (57) controls each three-way switching valve (71, 72) to the first state.
  • the control unit (57) controls the electric motor (75) so that the three-way switching valves (71, 72) are in the first state.
  • the rotating portion (76) of each of the three-way switching valves (71, 72) in the first state has a rotational angular position that allows the first port (P1) and the second port (P2) to communicate with each other via the internal flow path (77). Becomes Thereby, in the cooling operation and the heating operation, the refrigerant flows through the liquid refrigerant flow path (41) and the gas refrigerant flow path (42).
  • a signal is output from the indoor controller (33) to the control unit (57).
  • the control unit (57) receiving this signal switches each of the three-way switching valves (71, 72) to the second state.
  • the control unit (57) controls the electric motor (75) so that the three-way switching valves (71, 72) are in the second state.
  • the rotating portion (76) of each of the three-way switching valves (71, 72) in the second state has a rotational angular position that allows the first port (P1) and the third port (P3) to communicate with each other via the internal flow path (77). Becomes Thus, when the refrigerant leaks, the second port (P2) is substantially closed, and the utilization circuit (30a) is disconnected from the refrigerant circuit (10a).
  • the flow path switching valves (V1, V2) are connected to the first port (P1) connected to the first flow path (41a, 42a) and the second flow path (41b, 42b).
  • An electric rotary type having a second port (P2), a rotary part (76) in which an internal flow path (77) is formed, and an electric motor (75) for rotationally driving the rotary part (76),
  • the rotating portion (76) of the flow path switching valve (V1, V2) is in a first state in which the first port (P1) and the second port (P2) are in communication with each other via the internal flow path (77). And the rotation angle position of the second state in which the first port (P1) and the second port (P2) are closed.
  • the electric rotary type flow path switching valve (V1, V2) has a wider flow path than solenoid valves and electric valves. Therefore, the pressure loss of the shutoff valve can be reduced.
  • the refrigerant flow passages (41, 42) include a first flow passage (41a, 42a) formed on the heat source circuit (20a) side of the flow passage switching valve (V1, V2), and A second flow path (41b, 42b) formed on the utilization circuit (30a) side of the flow path switching valve (V1, V2), wherein the flow path switching valve (V1, V2) is closed.
  • the rotating portion (76) of the three-way switching valve (71, 72) in the first state is constituted by an electric rotary three-way switching valve (71, 72) having three ports (P3).
  • the rotation angle position that allows the first port (P1) and the second port (P2) to communicate with each other via (77) is reached, and the rotating portion (76) of the three-way switching valve (71, 72) in the second state is reached.
  • one of the first port (P1) and the second port (P2) communicates with the third port (P3) through the internal flow path (77), and the first port (P1) and the The other of the two ports (P2) comes to a rotation angle position where it is closed by the rotating portion (76).
  • the three-way switching valve (71, 72) communicates with the first port (P1) and the closed third port (P3) and the second port (P2) with the rotating portion (76).
  • the structure may be closed by the surface of ). Also in this configuration, in the cooling operation and the heating operation, the refrigerant flows through the refrigerant flow paths (41, 42), and when the refrigerant leaks, the utilization circuit (30a) can be separated from the refrigerant circuit (10a).
  • Modification 3 shown in FIG. 6 differs from the above embodiment in the configuration of the blocking unit (50).
  • the shutoff valve of the shutoff unit (50) is configured by a two-way switching valve (81, 82).
  • the two-way switching valve (81, 82) of this example is an electric rotary type so-called rotary valve.
  • a first two-way switching valve (81) is connected to the liquid refrigerant flow path (41).
  • a second two-way switching valve (82) is connected to the gas refrigerant channel (42).
  • Each two-way switching valve (81, 82) has a first port (P1) and a second port (P2).
  • the first port (P1) of the first two-way switching valve (81) is connected to the first liquid flow path (41a).
  • the second port (P2) of the first two-way switching valve (81) is connected to the second liquid flow path (41b).
  • the first port (P1) of the second two-way switching valve (82) is connected to the first gas flow path (42a).
  • the second port (P2) of the second two-way switching valve (82) is connected to the second gas flow path (42b).
  • the third port (P3) of the second two-way switching valve (82) is closed by the fourth closing member (84).
  • Each two-way switching valve (81, 82) includes an electric motor (75), a rotating portion (76) that is rotationally driven by the electric motor (75), and a case (78) that houses the rotating portion (76).
  • the case (78) is formed with the above-mentioned first port (P1) and second port (P2).
  • An internal flow path (77) is formed in the rotating portion (76).
  • the internal flow path (77) of this example is formed in a linear shape as viewed from a cross section perpendicular to the axis.
  • Each two-way switching valve (81, 82) is switched between a first state in which the refrigerant flow passages (41, 42) are in conduction and a second state in which the refrigerant flow passages (41, 42) are shut off.
  • each two-way switching valve (81, 82) controls each two-way switching valve (81, 82) to the first state.
  • the control unit (57) controls the electric motor (75) so that the two-way switching valves (81, 82) are in the first state.
  • the rotation part (76) of each two-way switching valve (81, 82) in the first state is a rotation angle that allows the first port (P1) and the second port (P2) to communicate with each other via the internal flow path (77). The position. Thereby, in the cooling operation and the heating operation, the refrigerant flows through the liquid refrigerant flow path (41) and the gas refrigerant flow path (42).
  • each two-way switching valve (81, 82) When the refrigerant leaks in the usage circuit (30a) and the refrigerant leak detection sensor (35) detects the refrigerant leak, a signal is output from the indoor controller (33) to the control unit (57). As shown in FIG. 6(B), the control unit (57) receiving this signal switches each two-way switching valve (81, 82) to the second state. The control unit (57) controls the electric motor (75) so that the two-way switching valves (81, 82) are in the second state. The rotation part (76) of each two-way switching valve (81, 82) in the second state is at the rotation angle position where the first port (P1) and the second port (P2) are closed by the rotation part (76). ..
  • the internal flow path (77) is orthogonal to the first port (P1) and the second port (P2).
  • the first port (P1) and the second port (P2) are blocked by the surface of the rotating portion (76).
  • the utilization circuit (30a) is separated from the refrigerant circuit (10a).
  • the two-way switching valve may be a ball valve type that is applied to water piping and the like.
  • the electric rotary flow path switching valve may be a four-way switching valve having four ports. In this case, for example, two ports of the four-way switching valve are closed by the closing member.
  • the four-way switching valve switches between a first state in which the first port (P1) and the second port (P2) communicate with each other and a state in which the second port (P2) is closed.
  • a plurality of indoor units (30) may be connected in parallel to the pair of refrigerant flow paths (41, 42).
  • a plurality of utilization circuits (30a) may be connected in parallel to the pair of liquid refrigerant channel (41) and gas refrigerant channel (42).
  • the heat source circuit (20a) of one outdoor unit (20) and the utilization circuit (30a) of one indoor unit (30) are liquid communication pipes. It may be configured to be connected to each other via (11) and the gas communication pipe (15).
  • the air conditioner (10) may be a so-called pair type.
  • the liquid communication pipe (11) forms the liquid-side refrigerant flow path (41)
  • the gas communication pipe (15) forms the gas-side refrigerant flow path (42).
  • the indoor unit (30) is not limited to the ceiling-mounted type, but may be another type such as a wall-mounted type or a floor-standing type.
  • the flow path switching valves (V1, V2) in the above-described embodiment and each modification may be combined in any pattern.
  • the flow path switching valve of the present disclosure may be adopted in only one of the two refrigerant flow paths (41, 42), and the solenoid valve or the expansion valve may be adopted in the other.
  • the refrigerant used in the refrigerant circuit (10a) of the air conditioner (10) according to the above embodiment, each modified example, and other embodiments is a flammable refrigerant.
  • flammable refrigerants include Class 3 (strongly flammable), Class 2 (weakly flammable), Subclass 2L (subclass 2L( Slightly flammable) is included.
  • FIG. 9 shows a specific example of the refrigerant used in the above embodiment and each modified example. In FIG.
  • ASHRAE Number is the Ashley number of the refrigerant specified by ISO817
  • Component is the Ashley number of the substance contained in the refrigerant
  • mass % is the mass percent concentration of each substance contained in the refrigerant.
  • “Alternative” indicates the name of the substance of the refrigerant often replaced by the refrigerant.
  • the refrigerant used is R32.
  • the refrigerant illustrated in FIG. 9 is characterized by having a density higher than that of air.
  • the present disclosure is useful for air conditioners and flow path switching valves.
  • Air conditioner 10a Refrigerant circuit 20 Outdoor unit (heat source unit) 20a Heat source circuit 21 Compressor 22 Outdoor heat exchanger (heat source heat exchanger) 30 Indoor unit (use unit) 30a Utilization circuit 31 Indoor heat exchanger (utilization heat exchanger) 41 Refrigerant flow path 42 Refrigerant flow path 41a, 42a First flow path 41b, 42b Second flow path 51, 52 Four-way switching valve 55, 56 Low pressure pipe 60 High pressure introduction circuit 61 Liquid side introduction path 62 Gas side introduction path 62 Gas side Introductory path 64 First check valve (first on-off valve) 65 Second check valve (second on-off valve) 71,72 Three-way switching valve 75 Electric motor 76 Rotating part 77 Internal flow path V1, V2 Flow path switching valve

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Multiple-Way Valves (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
PCT/JP2019/045808 2019-01-02 2019-11-22 空気調和機及び流路切換弁 WO2020141582A1 (ja)

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CN201980087572.9A CN113227663B (zh) 2019-01-02 2019-11-22 空调机以及流路切换阀
EP19908011.0A EP3889515A4 (en) 2019-01-02 2019-11-22 AIR CONDITIONER AND FLOW PATH SWITCHING VALVE
US17/356,910 US20210318041A1 (en) 2019-01-02 2021-06-24 Air conditioner and flow path switching valve

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Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
KR102438931B1 (ko) * 2020-12-11 2022-08-31 엘지전자 주식회사 공기조화기 및 그 제어방법
BE1030293B1 (nl) * 2022-02-23 2023-09-18 Daikin Europe Nv Airconditioningsysteem en werkwijze voor het tot stand brengen van een besturingslogica voor de bediening van de afsluitklep

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62141469A (ja) * 1985-12-14 1987-06-24 ダイキン工業株式会社 ヒ−トポンプ式空気調和機
JPH11182895A (ja) * 1997-12-17 1999-07-06 Mitsubishi Electric Corp 空気調和機
JP2010007998A (ja) * 2008-06-27 2010-01-14 Daikin Ind Ltd 空気調和機の室内ユニットおよびそれを備えた空気調和機
JP2012013339A (ja) 2010-07-02 2012-01-19 Hitachi Appliances Inc 空気調和機
JP2012127519A (ja) * 2010-12-13 2012-07-05 Panasonic Corp 空気調和機
JP2015117894A (ja) * 2013-12-19 2015-06-25 日立アプライアンス株式会社 空気調和機の室外機

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3060770B2 (ja) * 1993-02-26 2000-07-10 ダイキン工業株式会社 冷凍装置
JPH09264641A (ja) * 1996-03-29 1997-10-07 Matsushita Electric Ind Co Ltd 冷凍サイクル装置
JP3530370B2 (ja) * 1998-01-20 2004-05-24 株式会社鷺宮製作所 冷暖房ユニットの駆動用電力供給方法及びその装置
JP4265868B2 (ja) * 2000-12-11 2009-05-20 東芝キヤリア株式会社 空気調和機
JP4141676B2 (ja) 2001-11-06 2008-08-27 三菱電機株式会社 蓄熱式空気調和装置およびその冷媒回収方法
KR20040073565A (ko) * 2002-01-15 2004-08-19 가부시끼가이샤 도시바 냉매누출을 알리는 알림장치를 구비한 냉장고
JP2003227664A (ja) 2002-02-05 2003-08-15 Mitsubishi Electric Corp 空気調和機および空気調和機の運転方法
JP2007163011A (ja) * 2005-12-13 2007-06-28 Daikin Ind Ltd 冷凍装置
CN102667276B (zh) * 2009-10-22 2014-03-12 大金工业株式会社 空调机
EP2570740B1 (en) * 2010-05-12 2019-02-27 Mitsubishi Electric Corporation Air conditioning apparatus
WO2012008148A1 (ja) * 2010-07-13 2012-01-19 ダイキン工業株式会社 冷媒流路切換ユニット
CN102213463B (zh) * 2011-05-26 2013-11-06 广东美的电器股份有限公司 使用可燃冷媒的空调器及其控制方法
KR101678324B1 (ko) * 2012-08-27 2016-11-21 다이킨 고교 가부시키가이샤 냉동장치
KR20140056965A (ko) 2012-11-02 2014-05-12 엘지전자 주식회사 공기조화기 및 그 제어 방법
WO2014083678A1 (ja) * 2012-11-30 2014-06-05 三菱電機株式会社 空気調和装置
JP6262560B2 (ja) 2014-02-18 2018-01-17 株式会社Ｎｔｔファシリティーズ 空気調和装置および空気調和装置の制御方法
JP6252332B2 (ja) * 2014-04-18 2017-12-27 ダイキン工業株式会社 冷凍装置
JP6604051B2 (ja) * 2015-06-26 2019-11-13 ダイキン工業株式会社 空気調和システム
CN109790992B (zh) * 2016-09-30 2023-06-30 三菱电机株式会社 室内机及空气调节机
JP7215819B2 (ja) * 2017-01-11 2023-01-31 ダイキン工業株式会社 空気調和装置及び室内ユニット
WO2019146070A1 (ja) * 2018-01-26 2019-08-01 三菱電機株式会社 冷凍サイクル装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62141469A (ja) * 1985-12-14 1987-06-24 ダイキン工業株式会社 ヒ−トポンプ式空気調和機
JPH11182895A (ja) * 1997-12-17 1999-07-06 Mitsubishi Electric Corp 空気調和機
JP2010007998A (ja) * 2008-06-27 2010-01-14 Daikin Ind Ltd 空気調和機の室内ユニットおよびそれを備えた空気調和機
JP2012013339A (ja) 2010-07-02 2012-01-19 Hitachi Appliances Inc 空気調和機
JP2012127519A (ja) * 2010-12-13 2012-07-05 Panasonic Corp 空気調和機
JP2015117894A (ja) * 2013-12-19 2015-06-25 日立アプライアンス株式会社 空気調和機の室外機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3889515A4

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CN113227663A (zh) 2021-08-06
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JP7412887B2 (ja) 2024-01-15
EP3889515A4 (en) 2022-02-16
US20210318041A1 (en) 2021-10-14
CN113227663B (zh) 2023-05-23

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