CN111033154A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN111033154A
CN111033154A CN201780093856.XA CN201780093856A CN111033154A CN 111033154 A CN111033154 A CN 111033154A CN 201780093856 A CN201780093856 A CN 201780093856A CN 111033154 A CN111033154 A CN 111033154A
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China
Prior art keywords
opening
closing valve
pressure
refrigerant
valve
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Granted
Application number
CN201780093856.XA
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Chinese (zh)
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CN111033154B (en
Inventor
菊地俊介
中川昌彦
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • 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
    • 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
    • F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • 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
    • F25B2400/12—Inflammable refrigerants
    • F25B2400/121—Inflammable refrigerants using R1234
    • 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
    • F25B2500/22—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
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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
    • F25B2600/2519—On-off 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/197—Pressures of the evaporator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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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)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The present invention relates to an air conditioner in which an outdoor unit having a compressor and an indoor unit having an expansion valve are connected by a refrigerant pipe, the air conditioner including: a 1 st opening/closing valve provided on a refrigerant inlet side of the indoor unit; a 2 nd opening/closing valve provided on a refrigerant outlet side of the indoor unit; a state detection unit which detects the state in the refrigerant pipe between the 1 st opening/closing valve and the 2 nd opening/closing valve; and a control device for controlling the 1 st on-off valve and the 2 nd on-off valve, wherein the control device detects the refrigerant leakage between the 1 st on-off valve and the 2 nd on-off valve based on the state detected by the state detection unit when the 1 st on-off valve and the 2 nd on-off valve are closed.

Description

Air conditioner
Technical Field
The present invention relates to an air conditioner for conditioning indoor air.
Background
In a conventional air conditioner, a refrigerant sealed in a refrigerant circuit is circulated and heat exchange is performed with air to realize a cooling operation and a heating operation. In an air conditioner, if a refrigerant sealed in a refrigerant circuit leaks, the amount of refrigerant in the refrigerant circuit is insufficient. Therefore, heat exchange between the refrigerant and the air cannot be sufficiently performed, and the operation efficiency is deteriorated.
On the other hand, in recent years, inhibition of GWP (Global Warming Potential) has become more severe according to the Freon discharge restriction method and the Montreal protocol in Japan. Therefore, it is conceivable that in the future, not only nonflammable refrigerants but also flammable refrigerants must be used as refrigerants.
In the case of using a refrigerant having flammability, it is necessary to quickly detect refrigerant leakage and ensure safety. In addition to an air conditioner equipped with a refrigerant detection device for detecting a refrigerant gas, an air conditioner has been proposed which detects a refrigerant shortage based on various parameters of an operation state and notifies of a refrigerant leakage. Further, a refrigeration apparatus has been proposed which detects refrigerant leakage by comparing an evacuation time during evacuation operation with a preset value of an evacuation time stored in advance (see, for example, patent document 1).
Patent document 1: japanese laid-open patent publication No. 2012-184889
However, in the conventional refrigerant leakage detection method, it is not possible to distinguish which part of the air conditioner has a refrigerant leakage, and the process of finding the leakage part takes time. In particular, when refrigerant leakage occurs in an indoor unit where there is a possibility that the leaked refrigerant may be accumulated, it is necessary to quickly detect the refrigerant leakage.
Disclosure of Invention
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide an air conditioner capable of quickly detecting whether or not refrigerant leakage has occurred in an indoor unit.
An air conditioner according to the present invention is an air conditioner in which an outdoor unit having a compressor and an indoor unit having an expansion valve are connected by a refrigerant pipe, the air conditioner including: a 1 st opening/closing valve provided on a refrigerant inlet side of the indoor unit; a 2 nd opening/closing valve provided on a refrigerant outlet side of the indoor unit; a state detection unit that detects a state in the refrigerant pipe between the 1 st opening/closing valve and the 2 nd opening/closing valve; and a control device that controls the 1 st opening/closing valve and the 2 nd opening/closing valve, wherein the control device detects refrigerant leakage between the 1 st opening/closing valve and the 2 nd opening/closing valve based on a state detected by the state detection unit when the 1 st opening/closing valve and the 2 nd opening/closing valve are closed.
As described above, according to the present invention, the refrigerant leakage is detected based on the pressure in the refrigerant pipe between the 1 st opening/closing valve and the 2 nd opening/closing valve that are closed, whereby it is possible to quickly detect whether or not the refrigerant leakage has occurred in the indoor unit.
Drawings
Fig. 1 is a schematic diagram illustrating an example of the configuration of an air conditioner according to embodiment 1.
Fig. 2 is a functional block diagram showing an example of the configuration of the control device of fig. 1.
Fig. 3 is a flowchart illustrating an example of the flow of the refrigerant leak detection process of the indoor unit according to embodiment 1.
Fig. 4 is a functional block diagram showing an example of the configuration of the control device according to embodiment 2.
Fig. 5 is a flowchart illustrating an example of the flow of the refrigerant leak detection process of the indoor unit according to embodiment 2.
Fig. 6 is a flowchart illustrating an example of the flow of the refrigerant leak detection process of the indoor unit according to embodiment 3.
Fig. 7 is a schematic view showing another example of the structure of the indoor unit shown in fig. 1.
Detailed Description
Embodiment 1.
An air conditioning apparatus according to embodiment 1 of the present invention will be described below. Fig. 1 is a schematic diagram illustrating an example of the configuration of an air conditioning apparatus 100 according to embodiment 1. As shown in fig. 1, the air conditioner 100 includes an outdoor unit 1, an indoor unit 2, and a controller 3.
[ Structure of air-conditioning apparatus 100 ]
(outdoor machine 1)
The outdoor unit 1 includes a compressor 11, a condenser 12, an outdoor unit fan 12a, and an accumulator 13. The compressor 11 sucks a low-temperature and low-pressure refrigerant, compresses the sucked refrigerant, and discharges a high-temperature and high-pressure refrigerant. The compressor 11 is constituted by, for example, an inverter compressor or the like, and the delivery amount per unit time, that is, the capacity is controlled by changing the compressor frequency. The compressor frequency of the compressor 11 is controlled by the control device 3.
The condenser 12 exchanges heat between the outdoor air supplied from the outdoor fan 12a and the refrigerant discharged from the compressor 11, and dissipates heat of the refrigerant to the outdoor air to condense the refrigerant. The outdoor fan 12a supplies outdoor air to the condenser 12. The rotation speed of the outdoor fan 12a is controlled by the control device 3. The air blowing amount to the condenser 12 is adjusted by controlling the rotation speed.
The accumulator 13 is provided on a low pressure side which is a suction side of the compressor 11. The accumulator 13 stores surplus refrigerant generated due to a difference in operation state between the cooling operation and the heating operation, surplus refrigerant for a change in the transient operation, and the like.
(indoor machine 2)
The indoor unit 2 includes a 1 st opening/closing valve 21, an expansion valve 22, an evaporator 23, and a refrigerant leakage detection unit 24. The 1 st opening/closing valve 21 is provided on the refrigerant inlet side of the indoor unit 2, and is opened and closed to control the flow of the refrigerant. The opening and closing of the 1 st opening and closing valve 21 is controlled by the control device 3. As the 1 st opening/closing valve 21, for example, a diaphragm valve with a low possibility of valve leakage is used.
The expansion valve 22 is composed of a valve whose opening degree can be controlled, such as an electronic expansion valve, or a capillary tube, and expands the refrigerant. The opening degree of the expansion valve 22 is controlled by the control device 3 so that the evaporation temperature of the evaporator 23 becomes the target evaporation temperature.
The evaporator 23 exchanges heat between the indoor air supplied from the indoor unit fan 23a and the refrigerant flowing out of the expansion valve 22. This generates cooling air to be supplied to the indoor space. The indoor fan 23a supplies air to the evaporator 23. The rotation speed of the indoor fan 23a is controlled by the control device 3. The amount of air blown to the evaporator 23 is adjusted by controlling the rotation speed.
The refrigerant leakage detector 24 is provided downstream of the evaporator 23 and includes a pressure sensor 24a, an inspection joint 24b, and a 2 nd opening/closing valve 24 c. The pressure sensor 24a is a state detection means for detecting the state in the refrigerant pipe. The pressure sensor 24a is provided upstream of the 2 nd opening/closing valve 24c, and detects the pressure P in the refrigerant pipe. The inspection joint 24b is an opening provided by branching from the refrigerant pipe, and is provided for filling and recovering the refrigerant, discharging air, and the like.
The 2 nd opening/closing valve 24c is provided on the refrigerant outlet side of the indoor unit 2 on the downstream side of the pressure sensor 24a, and is opened and closed to control the flow of the refrigerant. The opening and closing of the 2 nd opening and closing valve 24c is controlled by the control device 3. As the 2 nd opening/closing valve 24c, for example, a diaphragm valve with a low possibility of valve leakage is used.
In the air conditioning apparatus 100 according to embodiment 1, the compressor 11, the condenser 12, the 1 st opening/closing valve 21, the expansion valve 22, the evaporator 23, and the accumulator 13 are connected in an annular shape by refrigerant pipes to form a refrigerant circuit. R410A, which is an incombustible refrigerant, is generally used as the refrigerant circulating in the refrigerant circuit. In embodiment 1, a slightly flammable refrigerant such as R32 or R1234yf may be used in addition to the nonflammable refrigerant.
[ operation of air conditioner 100 ]
The operation of the air conditioner 100 during the cooling operation will be described. The low-temperature and low-pressure refrigerant is compressed by the compressor 11, and is discharged as a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the condenser 12. The high-temperature and high-pressure gas refrigerant flowing into the condenser 12 exchanges heat with outdoor air, condenses, turns into a high-pressure liquid refrigerant, and flows out of the condenser 12.
The high-pressure liquid refrigerant flowing out of the condenser 12 flows out of the outdoor unit 1 and flows into the indoor units 2. The high-pressure liquid refrigerant flowing into the indoor unit 2 flows into the expansion valve 22 through the 1 st opening/closing valve 21. The refrigerant flowing into the expansion valve 22 is decompressed by the expansion valve 22 to become a low-temperature low-pressure gas-liquid two-phase refrigerant, which flows into the evaporator 23.
The low-temperature low-pressure gas-liquid two-phase refrigerant flowing into the evaporator 23 exchanges heat with indoor air to absorb and evaporate the heat, and flows out of the evaporator 23 as a low-temperature low-pressure gas refrigerant. The low-temperature low-pressure gas refrigerant flowing out of the evaporator 23 flows out of the indoor unit 2 via the refrigerant leak detector 24. The low-temperature low-pressure gas refrigerant flowing out of the indoor unit 2 flows into the outdoor unit 1 and is sucked into the compressor 11.
(control device 3)
The control device 3 controls the compressor frequency of the compressor 11, the opening degree of the expansion valve 22, and the like based on detection results detected by various sensors and the like, not shown, provided in each part of the air conditioning apparatus 100. In particular, the control device 3 performs a refrigerant leakage detection process for determining whether or not refrigerant leakage has occurred in the indoor unit 2 based on the detection result of the pressure sensor 24a, and controls the operation of the air conditioning apparatus 100 based on the determination result of refrigerant leakage.
Fig. 2 is a functional block diagram showing an example of the configuration of the control device 3 in fig. 1. The control device 3 is configured by software executed on an arithmetic device such as a microcomputer to realize various functions, or by hardware such as a circuit device to realize various functions. In this example, the control device 3 is provided outside the outdoor unit 1 and the indoor units 2, but the present invention is not limited to this, and may be provided in any one of the outdoor unit 1 and the indoor units 2.
As shown in fig. 2, the control device 3 includes an operation control unit 31, a leakage determination unit 32, a storage unit 33, and a refrigerant shortage detection unit 34.
The refrigerant shortage detector 34 determines whether or not the refrigerant in the refrigerant circuit is in shortage based on detection information from various sensors and the like provided in the air conditioner 100. When it is determined that the refrigerant is insufficient, the refrigerant shortage detecting unit 34 detects the refrigerant shortage as a refrigerant leakage, and supplies refrigerant leakage information indicating the refrigerant leakage to the operation control unit 31. The shortage of the refrigerant in the refrigerant circuit can be detected by a commonly used method such as a method based on the degree of supercooling.
The operation control unit 31 controls the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c during the refrigerant leakage detection process based on the refrigerant leakage information from the refrigerant shortage detection unit 34. The operation control unit 31 controls the evacuation operation based on the result of the comparison of the pressures by the leak determination unit 32.
The leak determination unit 32 determines the pressure P detected by the pressure sensor 24a and the target pressure P stored in the storage unit 33mA comparison is made. Then, the leakage determination unit 32 determines whether or not refrigerant leakage has occurred in the indoor unit 2 based on the comparison result. Specifically, when the pressure P is lower than the target pressure PmIn a case where the refrigerant level is high, the leakage determination unit 32 determines that refrigerant leakage has occurred in the indoor unit 2.
The storage unit 33 stores parameters and the like used when processing is performed by each unit of the control device 3. For example, the storage 33 stores the target pressure P used by the leak determination unit 32m. Target pressure PmThe pressure is a pressure used as a reference when detecting leakage between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24 c. Target pressure PmFor example, the pressure is set to atmospheric pressure or lower.
[ refrigerant leak detection treatment ]
Fig. 3 is a flowchart illustrating an example of the flow of the refrigerant leak detection process of the indoor unit 2 according to embodiment 1. The refrigerant leak detection process according to embodiment 1 will be described with reference to fig. 3.
In step S1, the refrigerant shortage detector 34 determines whether or not the refrigerant leaks in the refrigerant circuit based on detection information from various sensors and the like. If it is determined that the refrigerant is leaking (step S1; yes), the refrigerant shortage detecting unit 34 supplies the refrigerant leakage information to the operation control unit 31.
In step S2, the operation control unit 31 closes the 1 st opening/closing valve 21 based on the refrigerant leakage information from the refrigerant shortage detection unit 34, and blocks the inflow of the refrigerant from the outdoor unit 1 side. If it is determined that the refrigerant does not leak (step S1; no), the process returns to step S1, and the process of step S1 is repeated until it is determined that the refrigerant leaks.
When the refrigerant leaks in the refrigerant circuit, the operation control unit 31 starts the evacuation operation in step S3, and moves the refrigerant in the refrigerant pipe on the indoor unit 2 side to the outside of the indoor unit 2, and lowers the pressure in the refrigerant pipe on the indoor unit 2 side to the atmospheric pressure or less. At this time, the operation control unit 31 lowers the low pressure threshold (low pressure value) of the compressor 11 determined to be abnormal on the suction side of the compressor 11 from the normal value, and places the inside of the refrigerant pipe of the indoor unit 2 in a negative pressure state.
In step S4, the leakage determination unit 32 compares the pressure P in the refrigerant pipe of the indoor unit 2 detected by the pressure sensor 24a with the target pressure P stored in the storage unit 33mA comparison is made. As a result of the comparison, when the pressure P is the target pressure PmIn the above case (step S4; NO), the process returns to step S4, and the process of step S4 is repeated until the pressure P is higher than the target pressure PmLow until it is low.
At a pressure P to target pressure PmWhen the refrigerant flow rate is low (step S4; yes), the operation controller 31 closes the 2 nd opening/closing valve 24c in step S5, and blocks the refrigerant from flowing from the outdoor unit 1 side to the indoor unit 2 side. Further, the operation control unit 31 stops the operation of the compressor 11 and stops the evacuation operation.
In step S6, the leakage determination unit 32 sets the pressure P between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c to the target pressure P after the set time has elapsed since the start of the processing in step S5mA comparison is made. At this time, since the pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is negative, if there is a leakage portion between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c, air flows into the refrigerant pipe in a state where the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c are closed. Therefore, the pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is increased from the negative pressure to the atmospheric pressure. Therefore, the opening and closing can be performed according to the 1 st opening and closing valve 21 and the 2 nd opening and closing valveThe pressure between the valves 24c determines the presence or absence of refrigerant leakage.
I.e. when the pressure P is greater than the target pressure PmIf it is high (step S6; yes), it is considered that the pressure P rises due to the inflow of air from the leak portion. Therefore, the leakage determination unit 32 determines in step S7 that refrigerant leakage from the indoor unit 2 has occurred.
On the other hand, when the pressure P is the target pressure PmIn the following case (step S6; NO), it is considered that there is no inflow of air from the leakage site. Therefore, the leakage determination unit 32 determines that the refrigerant leakage of the indoor unit 2 has not occurred, and the process returns to step S1.
As described above, in embodiment 1, refrigerant leakage is detected based on a change in pressure P when the refrigerant pipe is placed under negative pressure by performing the evacuation operation. When the refrigerant leakage in the indoor unit 2 is detected, the refrigerant in the indoor unit 2 moves to the outside of the indoor unit 2. Therefore, even when there is a leakage portion between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c, leakage of the refrigerant from the indoor unit 2 into the room is suppressed, and therefore, safety can be ensured.
In addition, when the refrigerant leaks, air is mixed into the refrigerant circuit due to the negative pressure. Therefore, even when the leak portion is simply repaired by brazing or the like, air remains in the refrigerant pipe. When air is mixed into the refrigerant circuit, the entire refrigerant circuit needs to be evacuated in order to prevent a failure of the compressor 11 and the like. At this time, only the indoor unit 2 is evacuated using the inspection joint 24b in a state where the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c are closed. This can reduce the trouble required for recovery, and therefore, recovery after simple repair of the leak portion becomes easy.
As described above, the air conditioning apparatus 100 according to embodiment 1 closes the 1 st on-off valve 21 provided on the refrigerant inlet side of the indoor unit 2 and the 2 nd on-off valve 24c provided on the refrigerant outlet side of the indoor unit 2. Then, based on the detection result of the pressure sensor 24a at this time, the refrigerant leakage between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is detected. This makes it possible to detect the presence or absence of refrigerant leakage in the indoor unit 2.
In the air conditioning apparatus 100, the operation control unit 31 closes the 1 st on-off valve 21 to be in a negative pressure state, and closes the 2 nd on-off valve 24c when the pressure between the 1 st on-off valve 21 and the 2 nd on-off valve 24c becomes lower than the target pressure. The leakage determination unit 32 determines that refrigerant leakage has occurred when the pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is higher than the target pressure after a set time has elapsed since the 2 nd opening/closing valve 24c was closed. When there is a leak portion between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c, air flows into the refrigerant pipe having a negative pressure, and the pressure is increased. This makes it possible to quickly detect the presence or absence of refrigerant leakage in the indoor unit 2.
Embodiment 2.
An air conditioning apparatus according to embodiment 2 of the present invention will be described. In embodiment 1, a case where a diaphragm valve in which no valve leakage occurs is used as the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c has been described. On the other hand, as the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c, a valve such as a needle valve or a butterfly valve may be used. A valve such as a needle valve or a butterfly valve may be subject to valve leakage because foreign matter is caught between the valve and a valve seat and the valve may not be normally closed when closed.
In the case of using a valve that may leak, it is conceivable that the refrigerant cut by closing flows into the refrigerant pipe due to the valve leakage, and the pressure in the refrigerant pipe increases. That is, in the case of using a valve that may leak, it is impossible to determine whether the pressure increase in the refrigerant pipe is caused by the inflow of air into the refrigerant pipe or the inflow of refrigerant due to valve leakage. Therefore, in embodiment 2, when detecting the presence or absence of refrigerant leakage in the indoor unit 2, it is determined whether or not valve leakage occurs in the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24 c.
[ Structure of air-conditioning apparatus 100 ]
The configuration of the air conditioner 100 according to embodiment 2 will be described. In addition, in the air conditioning apparatus 100 according to embodiment 2, since the function of the control device 203 is different from that of the control device 3 according to embodiment 1, only the control device 203 will be described here.
(control device 3)
Fig. 4 is a functional block diagram showing an example of the configuration of the control device 203 according to embodiment 2. As shown in fig. 4, the control device 203 includes an operation control unit 31, a refrigerant shortage detection unit 34, a leakage determination unit 232, a storage unit 233, and a pressure change measurement unit 235. In the following description, the same reference numerals are given to the portions common to embodiment 1, and detailed description thereof is omitted.
The pressure change measuring unit 235 makes the pressure P after the 2 nd opening/closing valve 24c is closed become lower than the target pressure PmAn increase amount Δ P that is the amount of change in the pressure P until the pressure P is high, and a rise time Δ t that is the change time until the increase amount Δ P is reachedpThe measurement is performed. That is, the pressure change measuring unit 235 measures the amount and time of change in pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c when the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c are closed.
The leak determination unit 232 compares the pressure P detected by the pressure sensor 24a with the target pressure P stored in the storage unit 33mA comparison is made. Then, the leakage determination unit 232 determines whether or not refrigerant leakage from the indoor unit 2 has occurred based on the comparison result. Further, the leakage determination unit 232 determines whether or not a valve leakage has occurred in the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c based on the comparison result and the measurement result of the pressure change measurement unit 235.
The storage unit 233 stores the target pressure P used by the leak determination unit 32m. In addition, in the storage unit 233, the increase amount Δ P and the increase time Δ t of the pressure P measured by the pressure change measuring unit 235 are storedpAnd establishing association for storage.
[ refrigerant leak detection treatment ]
Fig. 5 is a flowchart illustrating an example of the flow of the refrigerant leak detection process of the indoor unit 2 according to embodiment 2. The refrigerant leak detection process of embodiment 2 will be described with reference to fig. 5.
In step S10, a refrigerant leakage detection process is performed. In step S10, the processing of steps S1 to S5 of embodiment 1 shown in fig. 3 is performed. That is, when the insufficient refrigerant detector 34 detects a refrigerant leak in the refrigerant circuit, the operation controller 31 closes the 1 st opening/closing valve 21 to perform the evacuation operation, and then closes the 2 nd opening/closing valve 24c to complete the evacuation operation. This reduces the pressure in the refrigerant pipe on the indoor unit 2 side to the atmospheric pressure or less. When the 2 nd opening/closing valve 24c is closed, the pressure change measuring unit 235 starts to increase the pressure P by the amount Δ P and the time Δ tpThe measurement of (2).
In step S11, the leakage determination unit 232 sets the pressure P between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c to the target pressure P after the set time has elapsed since the start of the processing in step S10mA comparison is made. As a result of the comparison, the pressure P is compared with the target pressure PmWhen the pressure is high (step S11; YES), the pressure change measuring unit 235 outputs the rising amount Δ P and the rising time Δ t of the pressure P in step S12pThe measurement result of (1). When the pressure P is the target pressure PmIn the following case (step S11; NO), the process returns to step S10.
In step S13, the operation control unit 31 opens the 1 st opening/closing valve 21. Next, in step S14, the operation control unit 31 opens the 2 nd opening/closing valve 24 c. As a result, the refrigerant flows into the refrigerant pipe of the indoor unit 2, and when the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c causes the foreign matter to bite into it, the biting of the foreign matter is eliminated. In step S13 and step S14, the reason why the valves are opened in the order of the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is to prevent the backflow of the refrigerant.
In step S15, a refrigerant leakage detection process is performed. In step S15, the processing of step S2 to step S5 shown in fig. 3 is performed. That is, the operation control unit 31 closes the 1 st opening/closing valve 21 to perform the evacuation operation, and then closes the 2 nd opening/closing valve 24c to stop the operation of the compressor 11. Thereby, the pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is reduced to the atmospheric pressure or less.
In step S16, the leakage determination unit 232 sets the pressure P between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c to the target pressure P after the set time has elapsed since the start of the processing in step S15mA comparison is made. As a result of the comparison, when the pressure P is the target pressure PmIn the following case (step S16; no), the leakage determination unit 232 determines that the biting of the foreign matter into the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c is eliminated by the processing of step S13 and step S14. Then, the process returns to step S10.
On the other hand, when the pressure P is lower than the target pressure PmIf it is high (step S16; yes), the leak determination unit 232 determines in step S17 whether or not the processing of step S12 to step S16 has been performed the set number of times. If the processing of steps S12 to S16 is not performed the set number of times (step S17; no), the processing returns to step S12.
When the processing of steps S12 to S16 is performed the set number of times (step S17; yes), leak determination unit 232 reads the amount of increase Δ P and the increase time Δ t of pressure P from storage unit 233 in step S18pInformation on the number of times of setting the combination. Then, the leak determination unit 232 determines whether or not the read information is out of tolerance.
Here, the cause of the pressure increase between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c can be determined based on the presence or absence of the deviation in the information of the set number of times. When there is a leakage portion in the refrigerant pipe, the flow rate and time of the air flowing in are constant even if the refrigerant leakage detection process is repeated so that the pressure in the refrigerant pipe becomes constant. That is, when there is a leakage portion in the refrigerant pipe, even if the process of eliminating the biting of the foreign matter in the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c is performed, there is no variation in the information of the set number of times.
On the other hand, when the valve leakage occurs in the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c, it is conceivable that the flow rate and the time of the refrigerant flowing into the refrigerant pipe are different depending on the state of biting of the foreign matter. That is, when the valve leakage of the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c occurs, the state of the foreign matter is changed by performing the process of eliminating the biting-in of the foreign matter in the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24 c. Therefore, the information of the set number of times varies.
Thus, when there is no deviation in the information of the set number of times, it can be determined that the cause of the pressure increase between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is due to the presence of a leakage portion in the refrigerant pipe. In addition, when the information of the set number of times varies, it can be determined that the cause of the pressure increase between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is due to the valve leakage of the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24 c.
Therefore, when the information of the set number of times is deviated (step S18; YES), the leakage determination unit 232 determines that the pressure increase between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is caused by the valve leakage of the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24 c. Then, the process returns to step S10. On the other hand, if there is no deviation (step S18; NO), the leakage determination unit 232 determines in step S19 that the pressure increase between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is caused by the leakage of the refrigerant.
As described above, in embodiment 2, the process of opening the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c to flow the refrigerant into the refrigerant pipe is performed, and it is determined whether or not the valve leakage of the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c occurs. This can suppress erroneous detection of refrigerant leakage due to valve leakage of the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c, and can accurately detect the presence or absence of refrigerant leakage.
Embodiment 3.
An air conditioning apparatus according to embodiment 3 of the present invention will be described. Embodiment 3 is different from embodiments 1 and 2 in that, when a shortage of refrigerant is detected, the refrigerant pipe of the indoor unit 2 is brought into a high-pressure state to detect the presence or absence of refrigerant leakage. The configuration of the air conditioning apparatus 100 according to embodiment 3 is the same as that of embodiment 1, and therefore, the description thereof is omitted.
[ refrigerant leak detection treatment ]
Fig. 6 is a flowchart illustrating an example of the flow of the refrigerant leak detection process of the indoor unit 2 according to embodiment 3. The refrigerant leak detection process according to embodiment 3 will be described with reference to fig. 6.
In step S21, the refrigerant shortage detector 34 determines whether or not the refrigerant leaks in the refrigerant circuit based on detection information from various sensors and the like. If it is determined that the refrigerant is not leaked (step S21; no), the process returns to step S21, and the process of step S21 is repeated until it is determined that the refrigerant is leaked.
If it is determined that the refrigerant is leaking (step S21; yes), the refrigerant shortage detecting unit 34 supplies the refrigerant leakage information to the operation control unit 31. In step S22, the operation control unit 31 closes the 2 nd opening/closing valve 24c based on the refrigerant leakage information from the refrigerant shortage detection unit 34. In step S23, the operation control unit 31 starts the operation of the compressor 11 to accumulate the refrigerant in the refrigerant pipe of the indoor unit 2 so that the refrigerant pipe is in a high-pressure state.
In step S24, the leakage determination unit 32 compares the pressure P in the refrigerant pipe of the indoor unit 2 detected by the pressure sensor 24a and the target pressure P stored in the storage unit 33MA comparison is made. Target pressure PMIs a pressure that becomes a reference when detecting a leak in the refrigerant pipe of the indoor unit 2. Target pressure PMFor example, the pressure is set to be equal to or higher than the atmospheric pressure and equal to or lower than the pressure resistance of the refrigerant pipe.
As a result of the comparison, when the pressure P is less than the target pressure PMIn the case (step S24; NO), the process returns to step S24, and the process of step S24 is repeated until the pressure P becomes the target pressure PMAs described above. When the pressure P is the target pressure PMIn the above case (step S24; yes), the operation controller 31 closes the 1 st opening/closing valve 21 and blocks the refrigerant from flowing out to the outdoor unit 1 side in step S25. Further, the operation control unit 31 stops the operation of the compressor 11.
In step S26, the leakage determination unit 32 sets the time period to elapse since the start of the processing in step S25Then, the pressure P between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c and the target pressure P are measuredMA comparison is made. At this time, the refrigerant pipe between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is in a high-pressure state. If there is a leakage portion between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c, the refrigerant flows out of the refrigerant pipe in a state where the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c are closed, and therefore the pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c is reduced. Therefore, the presence or absence of refrigerant leakage can be determined from the pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24 c.
I.e. when the pressure P is greater than the target pressure PMWhen the pressure is low (step S26; yes), it is considered that the pressure P is lowered due to the refrigerant flowing out from the leakage portion. Therefore, the leakage determination unit 32 determines that the refrigerant leakage of the indoor unit 2 has occurred. Then, in step S27, the operation control unit 31 opens the 2 nd opening/closing valve 24c to operate the compressor 11.
On the other hand, when the pressure P is the target pressure PMIn the above case (step S26; no), it is considered that there is no leakage of the refrigerant. Therefore, the leakage determination unit 32 determines that the refrigerant leakage of the indoor unit 2 has not occurred, and the process returns to step S21.
In step S28, the leakage determination unit 32 determines whether or not the pressure P in the refrigerant pipe of the indoor unit 2 is negative. If the pressure P is not negative (step S28; no), the process returns to step S28, and the process of step S28 is repeated until the pressure P becomes negative.
When the pressure P is negative (step S28; yes), the operation control unit 31 closes the 2 nd opening/closing valve 24c and starts the evacuation operation. Thereby, the refrigerant in the refrigerant pipe of the indoor unit 2 moves to the outside of the indoor unit 2. Further, by closing the 2 nd opening/closing valve 24c, the air flowing in from the leakage portion due to the negative pressure in the refrigerant pipe is prevented from flowing out of the indoor unit 2.
As described above, in embodiment 3, the refrigerant leakage is detected based on the change in the pressure P when the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c are brought into the high-pressure state. When there is a leakage portion between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c, the refrigerant flows out from between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c in a high pressure state, and the pressure is reduced. As described above, in embodiment 3, since the refrigerant leakage is detected by the high-pressure refrigerant compressed by the compressor 11, the refrigerant leakage can be detected even when the degree of leakage is slight, such as when the leakage is gradual.
While embodiments 1 to 3 of the present invention have been described above, the present invention is not limited to the above-described embodiments 1 to 3 of the present invention, and various modifications and applications can be made without departing from the spirit of the present invention. For example, embodiments 1 to 3 of the present invention can be combined. Specifically, the present invention can also be applied to the valve leakage detection operation of embodiment 2 to embodiment 3.
Further, embodiment 1 or 2 in which the refrigerant leakage is detected by setting the pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c to a negative pressure may be combined with embodiment 3 in which the refrigerant leakage is detected by setting the pressure between the 1 st opening/closing valve 21 and the 2 nd opening/closing valve 24c to a high pressure state. This enables the refrigerant leakage of the indoor unit 2 to be detected with high accuracy.
In embodiment 2, whether or not the valve leakage of the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24c occurs is determined by performing a process of flowing the refrigerant in the refrigerant pipe of the indoor unit 2, but the present invention is not limited to this example. For example, the gas in the refrigerant pipe may be obtained from the inspection joint 24b, or a gas detection device as a state detection means may be connected to the inspection joint 24b, and the presence or absence of valve leakage may be determined based on the composition of the gas in the refrigerant pipe. Specifically, when the gas in the refrigerant pipe contains a gas in the air such as nitrogen, oxygen, or carbon dioxide, it is determined that the refrigerant leaks from the 1 st opening/closing valve 21 or the 2 nd opening/closing valve 24 c.
Fig. 7 is a schematic diagram showing another example of the structure of the indoor unit 2 shown in fig. 1. As shown in fig. 7, the refrigerant leakage detecting unit 24 of the indoor unit 2 includes a pressure sensor 24a, a 2 nd opening/closing valve 24c, and a gas detecting device 24 d. As described above, the refrigerant leak detector 24 may be provided with the gas detector 24d in advance, and detect the gas component in the refrigerant pipe as described above to determine the presence or absence of valve leakage.
In embodiments 1 to 3, the refrigerant leakage detection unit 24 is provided in the indoor unit 2, but the present invention is not limited to this, and for example, the refrigerant leakage detection unit 24 may be configured separately as a refrigerant leakage detection kit. Further, by attaching a refrigerant leakage detection kit to a conventional indoor unit, the same refrigerant leakage detection process as in embodiments 1 to 3 can be performed.
Further, by providing the on-off valves in addition to the 1 st on-off valve 21 and the 2 nd on-off valve 24c of embodiments 1 to 3, it is possible to more accurately detect the leaking portions of the refrigerant in the extension pipes or the like connecting the indoor unit 2 and the outdoor unit 1 to the indoor unit 2. For example, when the 3 rd opening/closing valve is provided on the upstream side of the 1 st opening/closing valve 21 and the 4 th opening/closing valve is provided on the downstream side of the 2 nd opening/closing valve 24c, leakage of the refrigerant between the 1 st opening/closing valve 21 or the 3 rd opening/closing valve and the 2 nd opening/closing valve 24c or the 4 th opening/closing valve can be detected.
Description of reference numerals
1 … outdoor unit; 2 … indoor unit; 3. 203 … control device; 11 … compressor; 12 … condenser; 12a … outdoor unit fan; 13 … a reservoir; 21 … No. 1 opening and closing valve; 22 … expansion valve; 23 … evaporator; 23a … indoor unit fan; 24 … refrigerant leakage detection unit; 24a … pressure sensor; 24b … inspecting the splice; 24c … No. 2 opening and closing valve; 24d … gas detection device; 31 … operation control unit; 32. 232 … leakage determination unit; 33. 233 … storage section; 34 … refrigerant shortage detector; 100 … air conditioning unit; 235 … pressure change measuring part.

Claims (7)

1. An air conditioner in which an outdoor unit having a compressor and an indoor unit having an expansion valve are connected by a refrigerant pipe,
wherein the content of the first and second substances,
the air conditioner is provided with:
a 1 st opening/closing valve provided on a refrigerant inlet side of the indoor unit;
a 2 nd on-off valve provided on a refrigerant outlet side of the indoor unit;
a state detection unit that detects a state in the refrigerant pipe between the 1 st opening/closing valve and the 2 nd opening/closing valve; and
a control device that controls the 1 st opening-closing valve and the 2 nd opening-closing valve,
the control device detects refrigerant leakage between the 1 st opening/closing valve and the 2 nd opening/closing valve based on the state detected by the state detection unit when the 1 st opening/closing valve and the 2 nd opening/closing valve are closed.
2. The air conditioner according to claim 1,
the control device has:
an operation control unit that controls operations of the 1 st opening/closing valve and the 2 nd opening/closing valve;
a storage unit that stores a target pressure that is a reference for a pressure between the 1 st opening/closing valve and the 2 nd opening/closing valve; and
and a leakage determination unit that determines whether or not refrigerant leaks, based on the pressure between the 1 st opening/closing valve and the 2 nd opening/closing valve and the target pressure.
3. The air conditioner according to claim 2,
the target pressure is set below atmospheric pressure,
the operation control part has a function of controlling the operation of the compressor, and
performing negative pressure processing that controls to be brought into a negative pressure state by closing the 1 st opening/closing valve and to close the 2 nd opening/closing valve when a pressure between the 1 st opening/closing valve and the 2 nd opening/closing valve becomes lower than the target pressure,
the leakage determination portion compares a pressure between the 1 st opening/closing valve and the 2 nd opening/closing valve after a set time has elapsed since the 2 nd opening/closing valve was closed with the target pressure,
and determining that a refrigerant leak occurs when the pressure between the 1 st opening/closing valve and the 2 nd opening/closing valve after the set time has elapsed is higher than the target pressure.
4. The air conditioner apparatus according to claim 3,
the control device further has:
a pressure change measuring unit that measures a change amount of the pressure between the 1 st on-off valve and the 2 nd on-off valve until the pressure between the 1 st on-off valve and the 2 nd on-off valve becomes higher than the target pressure after the 2 nd on-off valve is closed, and a change time until the change amount is reached; and
a storage unit that stores the measured amount of change and the change time in association with each other,
when the leakage determination unit determines that the pressure between the 1 st opening/closing valve and the 2 nd opening/closing valve after the set time has elapsed is higher than the target pressure,
the following processing is performed for a set number of times: a process of opening the 1 st opening/closing valve and the 2 nd opening/closing valve that are closed by the operation control unit; the negative pressure treatment; and a process of comparing, by the leakage determination unit, the pressure between the 1 st opening/closing valve and the 2 nd opening/closing valve after the elapse of the set time with the target pressure,
the pressure change measuring unit measures the change amount and the change time in accordance with the processing performed the set number of times,
the leakage determination unit determines whether or not there is a valve leakage in the 1 st opening/closing valve or the 2 nd opening/closing valve based on a plurality of variations and variations in the variation time.
5. The air conditioner according to claim 2,
the target pressure is set above atmospheric pressure,
the operation control part has a function of controlling the operation of the compressor, and
closing the 2 nd opening-closing valve and operating the compressor, and
control is performed so as to close the 1 st opening/closing valve when the pressure between the 1 st opening/closing valve and the 2 nd opening/closing valve becomes equal to or higher than the target pressure,
the leakage determination unit determines that refrigerant leakage has occurred when a pressure between the 1 st on-off valve and the 2 nd on-off valve, which is a set time period after the 1 st on-off valve is closed, is lower than the target pressure.
6. The air conditioning device according to any one of claims 1 to 5,
further provided with:
a 3 rd opening/closing valve provided upstream of the 1 st opening/closing valve; and
a 4 th opening/closing valve provided on a downstream side of the 2 nd opening/closing valve,
the control device detects refrigerant leakage based on a pressure between one of the 1 st opening-closing valve and the 3 rd opening-closing valve and one of the 2 nd opening-closing valve and the 4 th opening-closing valve when one of the 1 st opening-closing valve and the 3 rd opening-closing valve and one of the 2 nd opening-closing valve and the 4 th opening-closing valve are closed.
7. The air conditioning device according to any one of claims 1 to 6,
the air conditioner further comprises a gas detection device which is provided in the refrigerant pipe between the 1 st opening/closing valve and the 2 nd opening/closing valve and detects a component of gas in the refrigerant pipe,
the control device determines whether or not there is a valve leak due to the 1 st opening/closing valve or the 2 nd opening/closing valve, based on a detection result detected by the gas detection device.
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