WO2023199420A1 - Dispositif à cycle frigorifique - Google Patents

Dispositif à cycle frigorifique Download PDF

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Publication number
WO2023199420A1
WO2023199420A1 PCT/JP2022/017671 JP2022017671W WO2023199420A1 WO 2023199420 A1 WO2023199420 A1 WO 2023199420A1 JP 2022017671 W JP2022017671 W JP 2022017671W WO 2023199420 A1 WO2023199420 A1 WO 2023199420A1
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WO
WIPO (PCT)
Prior art keywords
refrigeration cycle
gate valve
refrigerant
pressure
compressor
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Application number
PCT/JP2022/017671
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English (en)
Japanese (ja)
Inventor
貴司 久保
光史 新海
学 田中
慎一 浅井
直人 関
Original Assignee
三菱電機株式会社
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.)
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2022/017671 priority Critical patent/WO2023199420A1/fr
Publication of WO2023199420A1 publication Critical patent/WO2023199420A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle

Definitions

  • the present disclosure relates to a refrigeration cycle device that utilizes a refrigeration cycle.
  • a refrigerant is sealed in a refrigeration cycle device.
  • refrigerants As interest in issues such as global warming caused by fluorocarbon gas has increased, there has been a desire to switch from refrigerants with high GWP (Global Warming Potential) to refrigerants with low GWP, and regulations regarding the types of refrigerants that can be used have become stricter. It has become to.
  • the refrigeration cycle equipment currently in use is no exception to the regulation of refrigerants, and it is desired that the refrigeration cycle equipment currently in use be converted to equipment compatible with refrigerants with low GWP.
  • Patent Document 1 claims that the pressure inside the device does not exceed the design pressure of the device by storing excess refrigerant in the refrigeration cycle during operation, but the pressure inside the device does not exceed the design pressure of the device while the operation is stopped. No structure or control has been proposed to prevent design pressures from being exceeded. In particular, with the rise in temperature in recent years, the pressure inside the equipment may rise excessively due to heat intrusion from the outside even when the equipment is stopped. There is a concern that the pressure inside the device may exceed the design pressure of the device.
  • the present disclosure solves the above-mentioned problems, and aims to provide a refrigeration cycle device in which the pressure inside the device does not exceed the design pressure of the device while the refrigeration cycle device is stopped.
  • a refrigeration cycle device is a refrigeration cycle device using a refrigeration cycle, and includes a compressor that compresses a refrigerant, a first heat exchanger that condenses the refrigerant discharged from the compressor, and a first heat exchanger that condenses the refrigerant discharged from the compressor.
  • a pressure reducing device that reduces the pressure of the refrigerant flowing out of the device, a second heat exchanger that evaporates the refrigerant that has been reduced in pressure by the pressure reducing device, and a second heat exchanger that is installed between the pressure reducing device and the suction port of the compressor, allowing the refrigerant flowing inside to pass through.
  • refrigerant piping that connects the storage tank section for storing the refrigerant flowing or flowing therein, the compressor, the first heat exchanger, the pressure reducing device, the second heat exchanger, and the storage tank section to form a refrigerant circuit; , a control device that controls each device provided in the refrigerant circuit, and the storage tank section has pipes installed in parallel, and one of the pipes installed in parallel includes a buffer tank for storing the refrigerant; , a first gate valve located upstream of the buffer tank, and a second gate valve located downstream of the buffer tank, and the control device is driven by a compressor and has a first gate valve located upstream of the buffer tank and a second gate valve located downstream of the buffer tank. The first gate valve and the second gate valve are opened when the refrigeration cycle apparatus is stopped while the valve is maintained in a fully closed state.
  • a refrigeration cycle device is a refrigeration cycle device using a refrigeration cycle, and includes a compressor that compresses a refrigerant, a first heat exchanger that condenses the refrigerant discharged from the compressor, and a first heat exchanger that condenses the refrigerant discharged from the compressor.
  • a pressure reducing device that reduces the pressure of the refrigerant flowing out of the device, a second heat exchanger that evaporates the refrigerant that has been reduced in pressure by the pressure reducing device, and a second heat exchanger that is installed between the pressure reducing device and the suction port of the compressor, allowing the refrigerant flowing inside to pass through.
  • refrigerant piping that connects the storage tank section for storing the refrigerant flowing or flowing therein, the compressor, the first heat exchanger, the pressure reducing device, the second heat exchanger, and the storage tank section to form a refrigerant circuit; , a control device that controls each device provided in the refrigerant circuit, and the storage tank section has pipes installed in parallel, and one of the pipes installed in parallel includes a buffer tank for storing the refrigerant; , a first gate valve located upstream of the buffer tank, and a second gate valve that is a check valve and located downstream of the buffer tank. The first gate valve is opened when the refrigeration cycle apparatus is stopped while the gate valve is maintained in a fully closed state.
  • the refrigeration cycle device controls the pressure of the low-pressure side piping between the pressure reducing device and the compressor when the device is stopped, even when using a refrigerant with a high operating pressure after retrofitting, by controlling the control device. can be released into the buffer tank in the storage tank. Therefore, the refrigeration cycle device can prevent the pressure inside the device from exceeding the design pressure of the device while the device is stopped.
  • FIG. 2 is a refrigerant circuit diagram of the refrigeration cycle device according to the first embodiment.
  • FIG. 3 is a refrigerant circuit diagram of a modification of the refrigeration cycle device according to the first embodiment.
  • FIG. 2 is a functional block diagram showing an example of the configuration of the control device shown in FIG. 1.
  • FIG. 4 is a hardware configuration diagram showing an example of the configuration of the control device shown in FIG. 3.
  • FIG. 4 is a hardware configuration diagram showing another configuration example of the control device shown in FIG. 3.
  • FIG. It is a figure showing the relationship between pressure [MPa] and elapsed time [s] of the refrigeration cycle device concerning Embodiment 1.
  • FIG. 3 is a flow diagram showing an example of control of the refrigeration cycle device according to the first embodiment.
  • FIG. 3 is a flow diagram showing an example of control of the refrigeration cycle device according to the first embodiment.
  • FIG. 3 is a conceptual diagram showing the relationship between first piping and second piping of the refrigeration cycle device according to Embodiment 1.
  • FIG. FIG. 2 is a refrigerant circuit diagram of a refrigeration cycle device according to a second embodiment.
  • 10 is a functional block diagram showing an example of the configuration of the control device shown in FIG. 9.
  • FIG. It is a figure which shows the relationship between the pressure [MPa] and elapsed time [s] of the refrigeration cycle apparatus based on Embodiment 2.
  • FIG. 3 is a flow diagram showing an example of control of the refrigeration cycle device according to Embodiment 2.
  • FIG. FIG. 3 is a refrigerant circuit diagram of a refrigeration cycle device according to a third embodiment.
  • 14 is a functional block diagram showing an example of the configuration of the control device shown in FIG. 13.
  • FIG. FIG. 7 is a flow diagram showing an example of control of the refrigeration cycle device according to Embodiment 3.
  • FIG. FIG. 7 is a refrigerant circuit diagram of a refrigeration cycle device according to a fourth embodiment. 17 is a functional block diagram showing an example of the configuration of the control device shown in FIG. 16.
  • FIG. FIG. 7 is a flow diagram showing an example of control of the refrigeration cycle device according to Embodiment 4.
  • FIG. 1 is a refrigerant circuit diagram of a refrigeration cycle device 100 according to the first embodiment.
  • FIG. 2 is a refrigerant circuit diagram of a modification of the refrigeration cycle device 100 according to the first embodiment.
  • the refrigeration cycle device 100 will be explained using FIGS. 1 and 2.
  • Solid line arrows shown in FIGS. 1 and 2 indicate the flow of refrigerant in the refrigeration cycle device 100.
  • the refrigeration cycle device 100 is a device that uses a refrigeration cycle, and is used for refrigeration or air conditioning purposes, such as a refrigeration device such as a refrigerator, a refrigeration device such as a freezer, a vending machine, an air conditioner, or a water heater. This is the equipment used.
  • the refrigeration cycle device 100 includes a compressor 10, a first heat exchanger 20, a pressure reducing device 30, a second heat exchanger 40, and a storage tank 50.
  • the refrigeration cycle device 100 also includes refrigerant pipes that connect the compressor 10, the first heat exchanger 20, the pressure reducing device 30, the second heat exchanger 40, and the storage tank 50 to form a refrigerant circuit 70. It has 75.
  • the refrigeration cycle device 100 includes a control device 80 that controls each device that constitutes the refrigeration cycle device 100.
  • the compressor 10 sucks low-temperature and low-pressure refrigerant through the suction port 10a, compresses the sucked refrigerant, and discharges high-temperature and high-pressure refrigerant from the discharge port 10b.
  • the compressor 10 includes an inverter device, and controls the capacity, which is the amount of compressor delivered per unit time, by changing the operating frequency.
  • the operating frequency of compressor 10 is controlled by control device 80. For example, when increasing the amount of heat exchange within the refrigerant circuit 70, the control device 80 increases the capacity of the compressor 10 to increase the amount of refrigerant circulating within the refrigerant circuit 70.
  • the first heat exchanger 20 performs heat exchange between the air existing around the first heat exchanger 20 and the refrigerant flowing inside the first heat exchanger 20.
  • the first heat exchanger 20 is a condenser.
  • the first heat exchanger 20, which is a condenser condenses the refrigerant discharged from the compressor 10.
  • the first heat exchanger 20 dissipates the heat of the refrigerant flowing inside the first heat exchanger 20 to the air existing around the first heat exchanger 20 to condense the refrigerant.
  • the pressure reducing device 30 reduces the pressure of the refrigerant flowing out from the first heat exchanger 20.
  • the pressure reducing device 30 is, for example, an electronic expansion valve that can adjust the opening degree of the throttle, and controls the pressure of the refrigerant flowing into the second heat exchanger 40 by adjusting the opening degree of the valve.
  • the opening degree of the valve of the pressure reducing device 30 is controlled by the control device 80.
  • the second heat exchanger 40 performs heat exchange between the air present around the second heat exchanger 40 and the refrigerant flowing inside the second heat exchanger 40 .
  • the second heat exchanger 40 is an evaporator.
  • the second heat exchanger 40 which is an evaporator, evaporates the refrigerant whose pressure has been reduced by the pressure reducing device 30.
  • the second heat exchanger 40 evaporates the refrigerant flowing inside the second heat exchanger 40, and cools the air around the second heat exchanger 40 with the heat of vaporization at that time.
  • the storage tank section 50 allows the refrigerant flowing therethrough to pass therethrough or stores the refrigerant flowing therein.
  • the storage tank section 50 can temporarily store the refrigerant flowing through the refrigerant circuit 70.
  • the storage tank 50 is provided between the pressure reducing device 30 and the refrigerant suction port 10a of the compressor 10.
  • the storage tank section 50 is provided on the low pressure side of the refrigeration cycle.
  • the storage tank section 50 is provided on the low-pressure side of the refrigeration cycle between the pressure reducing device 30 and the compressor 10 in the direction in which the refrigerant flows in the refrigerant circuit 70.
  • the storage tank section 50 is provided between the second heat exchanger 40 and the suction port 10a of the compressor 10. That is, the storage tank section 50 is provided between the second heat exchanger 40 and the compressor 10 in the direction in which the refrigerant flows in the refrigerant circuit 70 .
  • the storage tank portion 50 may be provided on the low-pressure side of the refrigeration cycle between the pressure reducing device 30 and the suction port 10a of the compressor 10 in the direction in which the refrigerant flows in the refrigerant circuit 70. Therefore, like the refrigeration cycle device 100 shown in FIG. 2, the storage tank section 50 may be provided between the pressure reducing device 30 and the second heat exchanger 40. That is, the storage tank section 50 may be provided between the pressure reducing device 30 and the second heat exchanger 40 in the direction in which the refrigerant flows in the refrigerant circuit 70.
  • the storage tank section 50 is assumed to be retrofitted to a refrigeration cycle device that does not have the storage tank section 50 during retrofitting. Retrofitting means, for example, replacing the refrigerant sealed in a refrigeration cycle device with another refrigerant and using the existing device.
  • the storage tank section 50 is not limited to a configuration in which it is installed as an afterthought.
  • the storage tank section 50 may be provided at the time of manufacturing the refrigeration cycle device 100, assuming a change in the refrigerant to be used in the future.
  • the storage tank 50 may be provided in advance before retrofitting in anticipation of a change in the refrigerant to be used in the future.
  • the storage tank section 50 has pipes installed in parallel, and one of the pipes installed in parallel includes a buffer tank 51 that stores refrigerant, a first gate valve 52 located upstream of the buffer tank 51, and a buffer tank 51 that stores a refrigerant. and a second gate valve 53 located downstream of the tank 51.
  • the pipes provided in parallel are a first pipe 78 and a second pipe 79 that constitute a parallel circuit through which refrigerant flows between an upstream pipe 76 and a downstream pipe 77, which will be described later.
  • the storage tank section 50 has an upstream pipe 76 and a downstream pipe 77 connected to the refrigerant pipe 75.
  • the upstream pipe 76 is connected to a refrigerant pipe 75 that is located upstream of the buffer tank 51, which will be described later, in the direction in which the refrigerant flows, and that constitutes the refrigerant circuit 70.
  • the upstream pipe 76 is a pipe located upstream of a first pipe 78 and a second pipe 79, which will be described later, in the direction in which the refrigerant flows.
  • the downstream pipe 77 is a pipe located downstream of the buffer tank 51 in the direction in which the refrigerant flows, and is connected to a refrigerant pipe 75 that constitutes the refrigerant circuit 70 . Further, the downstream pipe 77 is a pipe located downstream of a first pipe 78 and a second pipe 79, which will be described later, in the direction in which the refrigerant flows.
  • the storage tank section 50 has a first pipe 78 and a second pipe 79 that constitute a parallel refrigerant circuit between the upstream pipe 76 and the downstream pipe 77.
  • the first pipe 78 and the second pipe 79 form a parallel refrigerant circuit
  • the upstream pipe 76, the first pipe 78 and second pipe 79, and the downstream pipe 77 form a series refrigerant circuit.
  • the upstream pipe 76, the downstream pipe 77, and the first pipe 78 are pipes that constitute a part of the main refrigerant circuit 70
  • the second pipe 79 is a refrigerant circuit that is provided in parallel to the main refrigerant circuit 70. It may also be used as constituting piping.
  • the storage tank section 50 includes the upstream pipe 76, the downstream pipe 77, the first pipe 78, and the second pipe 79.
  • the upstream pipe 76 , the downstream pipe 77 , the first pipe 78 , and the second pipe 79 are connected to the refrigerant pipe 75 and constitute a part of the refrigerant circuit 70 . That is, the upstream pipe 76 , the downstream pipe 77 , the first pipe 78 , and the second pipe 79 constitute the refrigerant circuit 70 together with the refrigerant pipe 75 .
  • the upstream pipe 76, the downstream pipe 77, and the first pipe 78 may be formed separately from the refrigerant pipe 75, and the upstream pipe 76, the downstream pipe 77, and the first pipe 78 are It may be formed integrally with the piping 75. That is, the upstream pipe 76, the downstream pipe 77, and the first pipe 78 may utilize a part of the refrigerant pipe 75 that connects the second heat exchanger 40 and the compressor 10. Alternatively, the upstream pipe 76, the downstream pipe 77, and the first pipe 78 may utilize a part of the refrigerant pipe 75 that connects the pressure reducing device 30 and the second heat exchanger 40.
  • the storage tank section 50 has a first gate valve 52, a buffer tank 51, and a second gate valve 53.
  • a first gate valve 52 , a buffer tank 51 , and a second gate valve 53 are provided in the second pipe 79 of the storage tank section 50 .
  • the first gate valve 52, the buffer tank 51, and the second gate valve 53 are arranged on a refrigerant flow path formed by the second pipe 79. In the direction in which the refrigerant flows through the second pipe 79, the first gate valve 52, buffer tank 51, and second gate valve 53 are arranged in this order.
  • the first pipe 78 is not provided with a device that affects the flow of the refrigerant, and the first pipe 78 is provided to directly connect the upstream pipe 76 and the downstream pipe 77.
  • the refrigerant flows from the second heat exchanger 40 to the compressor 10 through the first pipe 78 while the compressor 10 is in operation.
  • the refrigerant flows from the pressure reduction device 30 to the second heat exchanger 40 through the first pipe 78 while the compressor 10 is operating.
  • the first gate valve 52 is a device that opens and closes a flow path, and is a device that adjusts the flow rate of the refrigerant flowing through the second pipe 79 in the refrigerant circuit 70.
  • the first gate valve 52 is, for example, a two-way valve.
  • the first gate valve 52 is an electronically controlled on-off valve that can adjust the opening degree of a valve such as a solenoid valve.
  • the opening and closing of the first gate valve 52 is controlled by a control device 80, and the opening degree of the first gate valve 52 is adjusted by the control device 80.
  • the first gate valve 52 is provided in the second pipe 79.
  • the first gate valve 52 is provided so as to be located upstream of the buffer tank 51 in the flow direction of the refrigerant flowing while the compressor 10 is being driven.
  • the first gate valve 52 allows refrigerant to flow into the buffer tank 51 when the valve is opened, and prevents the refrigerant from flowing into the buffer tank 51 when the valve is closed.
  • the first gate valve 52 When the first gate valve 52 is closed, the first gate valve 52 is closed and no refrigerant flows through the second pipe 79, and no refrigerant flows into the buffer tank 51 from the second heat exchanger 40 or the pressure reducing device 30.
  • the refrigerant flowing out from the second heat exchanger 40 passes through the first pipe 78 and is sucked into the compressor 10.
  • the refrigerant flowing out from the pressure reducing device 30 flows into the second heat exchanger 40 through the first pipe 78.
  • the buffer tank 51 is provided between the first gate valve 52 and the second gate valve 53 in the second pipe 79. That is, in the flow direction of the refrigerant flowing through the second pipe 79, the buffer tank 51 is provided so as to be located downstream of the first gate valve 52, and is located upstream of the second gate valve 53. It is provided.
  • the buffer tank 51 is a container that stores refrigerant.
  • the buffer tank 51 can store refrigerant up to a predetermined capacity.
  • the refrigeration cycle device 100 releases the refrigerant to the buffer tank 51 by controlling the opening and closing of the first gate valve 52 and the second gate valve 53 of the storage tank 50 to prevent the pressure inside the device from increasing. suppress.
  • the refrigerant is released into the buffer tank 51 by controlling the opening and closing of the first gate valve 52 and the second gate valve 53 of the storage tank 50. suppress the pressure rise inside the equipment.
  • the second gate valve 53 is a device that opens and closes the flow path, and is a device that adjusts the flow rate of the refrigerant flowing through the second pipe 79 in the refrigerant circuit 70.
  • the second gate valve 53 is, for example, a two-way valve.
  • the second gate valve 53 is an electronically controlled on-off valve that can adjust the opening degree of a valve such as a solenoid valve. The opening and closing of the second gate valve 53 is controlled by the control device 80, and the opening degree of the second gate valve 53 is adjusted by the control device 80.
  • the second gate valve 53 is provided in the second pipe 79.
  • the second gate valve 53 is provided so as to be located downstream of the buffer tank 51 in the flow direction of the refrigerant flowing while the compressor 10 is being driven.
  • the second gate valve 53 prevents the refrigerant from flowing back into the buffer tank 51 by closing the valve.
  • the second gate valve 53 When the second gate valve 53 is closed, the second gate valve 53 is closed and the refrigerant does not flow through the second pipe 79, so that the refrigerant does not flow out from the buffer tank 51 to the compressor 10.
  • the refrigerant flowing out from the second heat exchanger 40 passes through the first pipe 78 and is sucked into the compressor 10.
  • the refrigerant flowing out from the pressure reducing device 30 flows into the second heat exchanger 40 through the first pipe 78.
  • each device or device constituting the refrigeration cycle device 100 is connected by a refrigerant pipe 75 to form a refrigerant circuit 70.
  • Refrigerant piping 75 connects each device that constitutes refrigeration cycle device 100 .
  • the refrigerant pipe 75 connects the compressor 10 , the first heat exchanger 20 , the pressure reducing device 30 , the second heat exchanger 40 , and the storage tank section 50 .
  • a refrigerant flows inside the refrigerant pipe 75 .
  • a compressor 10 In the refrigeration cycle device 100, a compressor 10, a first heat exchanger 20, a pressure reducing device 30, a second heat exchanger 40, and a storage tank 50 are connected by a refrigerant pipe 75 to form a refrigerant circuit 70.
  • the refrigerant circuit 70 is a closed circuit and forms a flow path through which refrigerant flows. During operation of the refrigeration cycle device 100, the refrigerant circulates through the refrigerant circuit 70.
  • Control device 80 The control device 80 controls each device provided in the refrigerant circuit 70.
  • the control device 80 controls the operation of the entire refrigeration cycle device 100 based on various information received from each device of the refrigeration cycle device 100.
  • the control device 80 controls the operating frequency of the compressor 10, the opening degree of the valve of the pressure reducing device 30, the opening degree of the first gate valve 52, and the second The opening degree of the gate valve 53 is controlled.
  • starting the operation of the refrigeration cycle apparatus 100 means circulating the refrigerant in the refrigerant circuit 70
  • stopping operation of the refrigeration cycle apparatus 100 means stopping the circulation of the refrigerant within the refrigerant circuit 70.
  • the control device 80 is in operation and can perform its functions.
  • FIG. 3 is a functional block diagram showing an example of the configuration of the control device 80 shown in FIG. 1.
  • the control device 80 includes a driving state determination section 81, a storage section 82, a time measurement section 83, and an input section 84.
  • the control device 80 also includes a compressor control section 85, a pressure reducing device control section 86, and a valve control section 87.
  • the operating state determination section 81 uses operating information of the refrigeration cycle apparatus 100 supplied from the compressor 10, the pressure reducing device 30, the first gate valve 52, and the second gate valve 53, and control information predetermined in the storage section 82. Based on this, the operation of the refrigeration cycle device 100 is controlled.
  • the operating information and control information of the refrigeration cycle device 100 include, for example, the operating frequency of the compressor 10, the opening degree of the valve of the pressure reducing device 30, the opening degree of the first gate valve 52, the opening degree of the second gate valve 53, etc. be.
  • the operation information of the refrigeration cycle device 100 may be supplied by communication from the compressor 10, the pressure reducing device 30, the first gate valve 52, and the second gate valve 53, and the operation information of each device currently set in the control device 80 may be supplied by communication. You can also use the state. That is, the control device 80 uses, as operating information of the refrigeration cycle device 100, the operating frequency of the compressor 10, the opening degree of the valve of the pressure reducing device 30, the opening degree of the first gate valve 52, and The opening degree of the second gate valve 53, etc. may also be used.
  • control device 80 adjusts the operating frequency of the compressor 10, the opening degree of the valve of the pressure reducing device 30, the opening degree of the first gate valve 52, the opening degree of the second gate valve 53, etc. It is done by doing.
  • the storage unit 82 stores in advance programs, data, etc. necessary as control information used by the control device 80.
  • the storage unit 82 stores information and the like necessary for the control device 80 to control the devices that constitute the refrigeration cycle device 100.
  • the storage unit 82 may store various setting information input to the input unit 84.
  • the clock unit 83 is composed of, for example, a timer or a real-time clock, and is used to obtain the current time and to measure a set time.
  • the timer section 83 calculates the compressor stop time.
  • the compressor stop time is, for example, when the compressor 10 stops, the cumulative time from when the compressor 10 stops to the present.
  • the time measurement unit 83 starts measuring the compressor stop time.
  • the timer 83 may measure not only the compressor stop time, but also the compressor operating time, for example, and can manage all the time related to the control of the refrigeration cycle device 100.
  • the input unit 84 is an information input device used when a user inputs information to the control device 80.
  • the user can set the timer of the clock section 83 via the input section 84. Further, the user can start or stop the operation of the refrigeration cycle apparatus 100 via the input unit 84.
  • the compressor control unit 85 controls the operating frequency of the compressor 10 based on the information from the operating state determination unit 81 to control the rotation speed of the compressor 10.
  • the pressure reducing device control unit 86 controls the opening degree of the pressure reducing device 30 based on the information from the operating state determining unit 81.
  • the valve control unit 87 controls the opening degree of the first gate valve 52 and the opening degree of the second gate valve 53 based on the information from the operating state determination unit 81 .
  • the operating state determination section 81, the compressor control section 85, the pressure reducing device control section 86, and the valve control section 87 are shown as different configurations; , the compressor control section 85, the pressure reducing device control section 86, and the valve control section 87 may be integrated.
  • FIG. 4 is a hardware configuration diagram showing an example of the configuration of the control device 80 shown in FIG. 3.
  • the control device 80 shown in FIG. 3 is configured with a processing circuit 80a, as shown in FIG. 4.
  • Each function of the operating state determination section 81, storage section 82, time measurement section 83, input section 84, compressor control section 85, pressure reducing device control section 86, and valve control section 87 shown in FIG. 3 is performed by the processing circuit 80a. This is realized by
  • the processing circuit 80a When each function is executed by hardware, the processing circuit 80a is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field-Programmable Gate). Array) or a combination of these.
  • the functions of the operating state determination section 81, storage section 82, time measurement section 83, input section 84, compressor control section 85, pressure reducing device control section 86, and valve control section 87 are realized by individual processing circuits 80a. Alternatively, the functions of these means may be realized by one processing circuit 80a.
  • FIG. 5 is a hardware configuration diagram showing another example of the configuration of the control device 80 shown in FIG. 3.
  • the control device 80 has a processor 80b and a memory 80c, as shown in FIG.
  • the functions of the operating state determination section 81, storage section 82, time measurement section 83, input section 84, compressor control section 85, pressure reducing device control section 86, and valve control section 87 are realized by the processor 80b and the memory 80c. .
  • the functions of the operating state determination section 81, storage section 82, time measurement section 83, input section 84, compressor control section 85, pressure reducing device control section 86, and valve control section 87 are as follows. Realized by software or firmware.
  • the functions of the operating state determination section 81, the storage section 82, the clock section 83, the input section 84, the compressor control section 85, the pressure reducing device control section 86, and the valve control section 87 is realized by a combination of software and firmware.
  • Software and firmware are written as programs and stored in memory 80c.
  • the processor 80b realizes the functions of each section by reading and executing programs stored in the memory 80c.
  • Examples of the memory 80c include ROM (Read Only Memory), flash memory, EPROM (Erasable and Programmable ROM), and EEPROM (Electrically Erasable and Programmable ROM).
  • a nonvolatile semiconductor memory such as a programmable ROM (ROM) is used.
  • a volatile semiconductor memory such as RAM (Random Access Memory) may be used as the memory 80c.
  • a removable recording medium such as a magnetic disk, a flexible disk, an optical disk, a CD (Compact Disc), an MD (Mini Disc), and a DVD (Digital Versatile Disc) may be used.
  • the refrigeration cycle device 100 may include a flow path switching device (not shown) in addition to the above configuration.
  • the flow path switching device is, for example, a four-way valve, and switches the direction in which the refrigerant flows.
  • the four-way valve may be connected as follows.
  • the four-way valve includes a pipe connected to the discharge port 10b of the compressor 10, a pipe connected to the suction port 10a of the compressor 10, a pipe connected to the first heat exchanger 20, and a pipe connected to the second heat exchanger 20. It is connected to the piping connected to 40.
  • Switching of the flow paths by the flow path switching device is performed by the control device 80.
  • the control device 80 switches the air conditioner between cooling operation and heating operation by switching the flow paths in the flow path switching device.
  • the first heat exchanger 20 may function as an evaporator by switching the flow paths using the flow path switching device.
  • the second heat exchanger 40 may function as a condenser by switching the flow paths using the flow path switching device.
  • the refrigeration cycle device 100 may include a first blower (not shown) that supplies air to the first heat exchanger 20, and a first blower that supplies air to the second heat exchanger 40. It may have two blowers (not shown).
  • the refrigerant that has flowed into the first heat exchanger 20 exchanges heat with the air existing around the first heat exchanger 20.
  • the refrigerant radiates heat to the air around the first heat exchanger 20, thereby condensing and liquefying the refrigerant.
  • the air existing around the first heat exchanger 20 is heated.
  • the liquid refrigerant that has flowed out of the first heat exchanger 20 flows through the refrigerant pipe 75 and flows into the pressure reducing device 30.
  • the liquid refrigerant that has flowed into the pressure reducing device 30 is decompressed and expanded to become a gas-liquid two-phase refrigerant at low temperature and low pressure.
  • the gas-liquid two-phase refrigerant that has flown out of the pressure reducing device 30 flows into the second heat exchanger 40 that functions as an evaporator.
  • the refrigerant flowing into the second heat exchanger 40 exchanges heat with the air existing around the second heat exchanger 40, evaporates, and gasifies. At this time, the air existing around the second heat exchanger 40 is cooled by heat exchange with the refrigerant. Thereafter, the evaporated low-temperature, low-pressure gaseous refrigerant flows out of the second heat exchanger 40, passes through the storage tank 50, and is sucked into the compressor 10. The refrigerant sucked into the compressor 10 is again compressed by the compressor 10 into a high-temperature and high-pressure gas refrigerant, and then discharged.
  • the gas-liquid two-phase refrigerant that has flowed out of the pressure reducing device 30 passes through the storage tank 50 and flows into the second heat exchanger 40 that functions as an evaporator.
  • the refrigerant flowing into the second heat exchanger 40 exchanges heat with the air existing around the second heat exchanger 40, evaporates, and gasifies.
  • the air existing around the second heat exchanger 40 is cooled by heat exchange with the refrigerant.
  • the evaporated low temperature and low pressure gaseous refrigerant flows out of the second heat exchanger 40 and is sucked into the compressor 10.
  • the refrigerant sucked into the compressor 10 is again compressed by the compressor 10 into a high-temperature and high-pressure gas refrigerant, and then discharged.
  • FIG. 6 is a diagram showing the relationship between the pressure [MPa] and elapsed time [s] of the refrigeration cycle device 100 according to the first embodiment.
  • FIG. 7 is a flow diagram showing an example of control of the refrigeration cycle device 100 according to the first embodiment.
  • FIG. 6 shows an example of the pressure in the low-pressure side piping.
  • the low pressure side pipe is a pipe that constitutes the refrigerant circuit 70 from the pressure reducing device 30 to the compressor 10 in the direction of refrigerant flow, and constitutes the refrigerant circuit 70 between the pressure reducing device 30 and the suction port 10a of the compressor 10. This is the piping.
  • the vertical axis shown in FIG. 6 indicates pressure [MPa], and the horizontal axis indicates elapsed time [s].
  • the design pressure P1 shown in FIG. 6 is the upper limit value of the design pressure of the refrigeration cycle device 100 and is stored in the storage unit 82.
  • the flow of the refrigerant in the storage tank 50 and the control by the control device 80 will be described using FIGS. 6 and 7. Note that, before the control shown in FIG. 6, the refrigeration cycle apparatus 100 may perform a pump-down operation to recover refrigerant.
  • the refrigerant is recovered to the first heat exchanger 20 or the like.
  • the refrigeration cycle apparatus 100 stops operation of the apparatus by the control shown in FIG. 6 in response to concerns that the design pressure may be exceeded when the apparatus is stopped due to refrigerant that has not been transferred to the refrigerant storage area during pump-down operation. During operation, the pressure inside the equipment is prevented from exceeding the design pressure of the equipment.
  • it is common to provide a receiver (liquid reservoir) between the condenser and the expansion valve, and although it is not essential, a receiver (liquid reservoir) is provided between the first heat exchanger 20 and the pressure reducing device 30. A receiver may also be provided.
  • the refrigeration cycle apparatus 100 may or may not perform a pump-down operation to recover refrigerant.
  • the refrigeration cycle apparatus 100 can exhibit its effects even if the pump-down operation for recovering refrigerant is not performed before the control shown in FIG. 6 .
  • the control device 80 maintains the fully closed state of the first gate valve 52 and the second gate valve 53, and blocks the refrigerant circuit 70 of the second pipe 79 (step SP1). ). Therefore, during operation of the refrigeration cycle apparatus 100, the refrigerant does not flow through the refrigerant circuit 70 of the second pipe 79 but flows through the refrigerant circuit 70 of the first pipe 78.
  • the period from time T0 to time T1 corresponds to the time when the refrigeration cycle device 100 is operating. Time T1 is the point in time when the refrigeration cycle device 100 is stopped, as will be described later.
  • the refrigerant that has flowed out of the second heat exchanger 40 flows through the first pipe 78 of the storage tank 50 and is sucked into the compressor 10.
  • the refrigerant that has flowed out of the pressure reducing device 30 flows through the first pipe 78 of the storage tank 50 and flows into the second heat exchanger 40.
  • the refrigeration cycle device 100 is stopped (step SP2).
  • the control device 80 receives a command to stop the operation of the refrigeration cycle device 100, the control device 80 stops the operation of the compressor 10.
  • the control device 80 controls the refrigeration cycle device 100 by comparing detection data from a suction pressure sensor 60 (see FIG. 9) or a suction temperature sensor 61 (see FIG. 13), which will be described later, with a threshold value stored in the storage unit 82. stop operation.
  • the command to stop the operation of the refrigeration cycle device 100 may be performed by a user's operation, and instead of the control device 80 receiving the command to stop the operation, the control device 80 can start the operation by receiving information from various sensors described below. You may decide to stop.
  • the control device 80 determines whether a predetermined set time S1 has elapsed since the operation of the refrigeration cycle device 100 was stopped (step SP3).
  • This set time S1 is stored in the storage section 82, the set time S1 is measured by the clock section 83, and the driving state determining section 81 determines whether or not the set time S1 has elapsed.
  • the control device 80 receives a command to stop the operation of the refrigeration cycle device 100, and when the refrigeration cycle device 100 is stopped, the control device 80 closes the first partition after a preset time S1 has elapsed since the stop of the operation of the refrigeration cycle device 100.
  • the valve 52 and the second gate valve 53 are opened (step SP4).
  • the control device 80 adjusts the opening degrees of the first gate valve 52 and the second gate valve 53 to a predetermined amount.
  • Time T2 shown in FIG. 6 is the point in time when the control device 80 opens the first gate valve 52 and the second gate valve 53. Note that the set time S1 may be approximately zero, and when the control device 80 receives a command to stop the operation of the refrigeration cycle device 100, the control device 80 immediately opens the first gate valve 52 and the second gate valve 53. Good too.
  • the control device 80 controls the operation of the first gate valve when the refrigeration cycle device 100 is stopped while the compressor 10 is being driven and the first gate valve 52 and the second gate valve 53 are maintained in a fully closed state. 52 and the second gate valve 53 are opened.
  • the refrigerant flows in the second pipe 79.
  • the refrigerant that has passed through the first gate valve 52 flows into the buffer tank 51 and is stored therein.
  • the refrigeration cycle apparatus 100 can suppress the pressure increase in the low-pressure side piping by letting the refrigerant in the low-pressure side piping escape into the buffer tank 51.
  • FIG. 8 is a conceptual diagram showing the relationship between the first pipe 78 and the second pipe 79 of the refrigeration cycle device 100 according to the first embodiment. Note that FIG. 8 is for explaining the relationship between the first pipe 78 and the second pipe 79, and the illustration of the first gate valve 52 and the second gate valve 53 is omitted.
  • the refrigeration cycle device 100 assumes that since the pressure on the buffer tank 51 side is low, refrigerant will move into the buffer tank 51 even if the compressor 10 is stopped.
  • the first pipe 78 and the second pipe 79 may have one or more of the following configurations.
  • the diameter of the second pipe 79 located upstream of the buffer tank 51 is made larger than the diameter of the first pipe 78 of the main refrigerant circuit.
  • the second pipe 79 located upstream of the buffer tank 51 is referred to as an upstream second pipe 79a.
  • the diameter D2 of the upstream second pipe 79a is larger than the diameter D1 of the first pipe 78 (diameter D2>diameter D1).
  • the position height in the direction of gravity of the second pipe 79 connected to the buffer tank 51 is lower than the position height in the direction of gravity of the first pipe 78 of the main refrigerant circuit. do.
  • the refrigeration cycle apparatus 100 is formed so that the position of the upstream second pipe 79a connected to the buffer tank 51 is lower than the position of the first pipe 78 of the main refrigerant circuit. Since the refrigerant is taken into the buffer tank 51 in the form of a gas refrigerant, it is desirable to connect the upstream second pipe 79a to the lower part of the container of the buffer tank 51.
  • the main refrigerant circuit 70 is a refrigerant circuit 70 formed in an annular shape through the compressor 10, the first heat exchanger 20, the pressure reducing device 30, the second heat exchanger 40, and the storage tank 50. . That is, the main refrigerant circuit 70 is a circuit used when performing a refrigeration cycle, and utilizes the refrigerant pipe 75 from the outlet of the storage tank 50 to the inlet of the storage tank 50 and the first pipe 78 of the storage tank 50.
  • the refrigerant circuit 70 is formed into an annular shape.
  • the control device 80 closes the first gate valve 52 and leaves the second gate valve 53 open after the start of operation of the refrigeration cycle device 100.
  • the refrigerant in the buffer tank 51 is moved to the main refrigerant circuit 70 until then.
  • Time T3 shown in FIG. 6 is the point in time when the control device 80 starts operating the refrigeration cycle device 100.
  • the command to start the operation of the refrigeration cycle device 100 may be given by a user's operation, and instead of the control device 80 receiving the command to start the operation, the control device 80 starts the operation by receiving information from various sensors described below. You may decide to start.
  • the control device 80 controls the operation of the refrigeration cycle device 100 by comparing detection data from a suction pressure sensor 60 (see FIG. 9) or a suction temperature sensor 61 (see FIG. 13), which will be described later, with a threshold value stored in the storage unit 82. may be started.
  • the control device 80 Upon receiving the command to start operating the refrigeration cycle device 100, the control device 80 determines whether a predetermined set time S2 has elapsed since the start of operation of the refrigeration cycle device 100 (step SP6). This set time S2 is stored in the storage unit 82, the set time S2 is measured by the clock unit 83, and the driving state determining unit 81 determines whether or not the set time S2 has elapsed.
  • the control device 80 receives the command to start the operation of the refrigeration cycle device 100, closes the first gate valve 52 after a predetermined set time S2 has elapsed since the start of the operation of the refrigeration cycle device 100, and closes the first gate valve 52.
  • the opening degree is adjusted to a predetermined amount (step SP7). For example, upon receiving a command to start operation of the refrigeration cycle device 100, the control device 80 fully closes the first gate valve 52. When starting the operation of the refrigeration cycle device 100, the control device 80 fully closes the first gate valve 52 after a preset time S2 has elapsed since the start of the operation of the refrigeration cycle device 100.
  • Time T4 shown in FIG. 6 is the point in time when the control device 80 closes the first gate valve 52. It is desirable that the refrigeration cycle device 100 keep the first gate valve 52 open until the refrigerant flows into the circuit on the buffer tank 51 side and returns to the main circuit by providing a set time S2. When the set time S2 is zero, it is assumed that refrigerant will not enter the circuit on the buffer tank 51 side due to the movement of the compressor 10, so the refrigerant will flow into the circuit on the buffer tank 51 side and enter the main circuit. A return refrigerant flow may not form.
  • the control device 80 closes the first gate valve 52 when the refrigeration cycle device 100 starts operating from the stopped state. Thereafter, the control device 80 closes the second gate valve 53 after the pressure inside the buffer tank 51 has decreased. The control device 80 maintains the first gate valve 52 in a closed state and the second gate valve 53 in an open state for a predetermined period of time, thereby reducing the pressure in the buffer tank 51. I judge that.
  • the control device 80 determines whether a predetermined set time S3 has elapsed since the first gate valve 52 was closed (step SP8).
  • the control device 80 closes the second gate valve 53 after a predetermined set time S3 has elapsed since closing the first gate valve 52 (in the case of YES in step SP8) (step SP9).
  • Time T5 shown in FIG. 6 is the point in time when the control device 80 closes the second gate valve 53.
  • the set time S3 from closing the first gate valve 52 to closing the second gate valve 53 may be set based on the volume of the buffer tank 51. This set time S3 is stored in the storage unit 82, the set time S3 is measured by the clock unit 83, and the driving state determining unit 81 determines whether or not the set time S3 has elapsed. By closing the second gate valve 53, the refrigeration cycle device 100 can prevent the refrigerant from flowing back into the buffer tank 51 from the side where the compressor 10 is disposed.
  • the diameter of the second pipe 79 located downstream of the buffer tank 51 may be made smaller than the diameter of the first pipe 78 in order to prevent backflow of the refrigerant.
  • the second pipe 79 located downstream of the buffer tank 51 is referred to as a downstream second pipe 79b.
  • the diameter D3 of the second downstream pipe 79b is smaller than the diameter D1 of the first pipe 78 (diameter D1>diameter D3).
  • the refrigeration cycle device 100 is provided between the pressure reducing device 30 and the suction port 10a of the compressor 10, and includes a storage tank portion 50 through which the refrigerant flowing therethrough passes or for storing the refrigerant flowing therein.
  • the storage tank section 50 has pipes installed in parallel, and one of the pipes installed in parallel includes a buffer tank 51 for storing refrigerant, and a first gate valve 52 located upstream of the buffer tank 51. , and a second gate valve 53 located downstream of the buffer tank 51.
  • the control device 80 controls the operation of the first gate valve when the refrigeration cycle device 100 is stopped while the compressor 10 is being driven and the first gate valve 52 and the second gate valve 53 are maintained in a fully closed state.
  • the refrigeration cycle device 100 can release the pressure of the low-pressure side piping to the buffer tank 51 of the storage tank 50 when the device is stopped, even when using a refrigerant with a high operating pressure after retrofitting. I can do it. Therefore, the refrigeration cycle device 100 can prevent the pressure inside the device from exceeding the design pressure of the device while the device is stopped.
  • the refrigeration cycle device 100 is provided between the pressure reducing device 30 and the suction port 10a of the compressor 10, and includes a storage tank portion 50 that allows the refrigerant flowing therethrough to pass therethrough or stores the refrigerant flowing therein.
  • the storage tank section 50 has a first pipe 78 and a second pipe 79 that constitute a parallel refrigerant circuit.
  • the first pipe 78 is provided to connect the upstream pipe 76 and the downstream pipe 77, and the second pipe 79 includes the first gate valve 52, the buffer tank 51, and the second gate valve 53. and is provided.
  • the refrigeration cycle device 100 controls the pressure of the low-pressure side piping to the buffer tank of the storage tank 50 when the device is stopped, even when using a refrigerant with a high operating pressure after retrofitting. 51 can be released. Therefore, the refrigeration cycle device 100 can prevent the pressure inside the device from exceeding the design pressure of the device while the device is stopped.
  • control device 80 controls the first gate valve 52 and the second gate valve 53 after a preset time S1 has elapsed since the stop of operation of the refrigeration cycle apparatus 100. open.
  • the refrigeration cycle device 100 can reduce the number of times the first gate valve 52 and the second gate valve 53 are controlled by setting the set time S1 in association with the rising pressure within the device.
  • the control device 80 when starting the operation of the refrigeration cycle device 100, the control device 80 fully closes the first gate valve 52 after a preset time S2 has elapsed since the start of the operation of the refrigeration cycle device 100.
  • the refrigeration cycle device 100 can form a flow of refrigerant that flows into the circuit on the buffer tank 51 side and returns to the main circuit.
  • the refrigeration cycle apparatus 100 can reduce the number of times the first gate valve 52 is controlled by setting the set time S2 in association with the decreasing pressure within the apparatus.
  • the control device 80 closes the first gate valve 52, and after closing the first gate valve 52, a preset After the set time S3 has elapsed, the second gate valve 53 is closed.
  • the refrigeration cycle device 100 can reduce the number of times the second gate valve 53 is controlled by setting the set time S3 in association with the decreasing pressure within the device.
  • the control device 80 controls the opening degrees of the first gate valve 52 and the second gate valve 53.
  • the refrigeration cycle device 100 operates the first gate valve 52 and the second gate valve 53 of the storage tank 50 in conjunction with the operation command and stop command of the device as a method for controlling the opening and closing of the valves of the storage tank 50 after the device is stopped. It is opened and closed. Since the refrigeration cycle device 100 controls the opening and closing of the first gate valve 52 and the second gate valve 53 of the storage tank section 50 using the control of the existing device, there is no need to significantly change the function of the existing device. Such a refrigeration cycle apparatus 100 and its control method can be adapted with minor software changes by reusing existing controls, and costs can be reduced compared to the case of replacing the refrigeration cycle apparatus 100.
  • the refrigeration cycle device 100 can be constructed by making a minor structural change to add the storage tank 50 and modifying the software of the control device 80 to replace the existing device. can be controlled so as not to exceed the design pressure. Therefore, the refrigeration cycle device 100 can use a refrigerant with higher pressure and physical properties than the refrigerant currently in use. This can be addressed by retrofitting.
  • the first pipe 78 and the second pipe 79 have one or more of the following configurations.
  • the diameter of the second pipe 79 located upstream of the buffer tank 51 is made larger than the diameter of the first pipe 78.
  • the position of the second pipe 79 connected to the buffer tank 51 is formed to be lower than the position of the first pipe 78.
  • the diameter D3 of the second pipe 79 located downstream of the buffer tank 51 is smaller than the diameter D1 of the first pipe 78.
  • FIG. 9 is a refrigerant circuit diagram of the refrigeration cycle device 100 according to the second embodiment.
  • FIG. 10 is a functional block diagram showing an example of the configuration of control device 80 shown in FIG. 9. As shown in FIG. Components having the same functions and actions as those of the refrigeration cycle device 100 according to Embodiment 1 are given the same reference numerals, and the description thereof will be omitted.
  • the differences between the second embodiment and the first embodiment will be mainly explained, and the configurations not explained in the second embodiment are the same as the first embodiment.
  • the refrigeration cycle device 100 includes a suction pressure sensor 60 in the refrigerant circuit 70.
  • Suction pressure sensor 60 detects the pressure of refrigerant sucked into compressor 10 .
  • the suction pressure sensor 60 is provided between the suction port 10a of the compressor 10 and the storage tank section 50.
  • the suction pressure sensor 60 detects the pressure of the refrigerant, for example, by measuring the pipe pressure of the refrigerant pipe 75 connected to the suction port 10a of the compressor 10.
  • the suction pressure sensor 60 detects the pressure of the refrigerant sucked into the compressor 10, which is the pressure on the low pressure side, and supplies the detected pressure data to the operating state determination section 81 of the control device 80.
  • the operating state determination unit 81 determines the operation of the refrigeration cycle device 100 based on the above-mentioned operating information of the refrigeration cycle device 100, pressure data detected by the suction pressure sensor 60, and control information stored in the storage unit 82. Control.
  • FIG. 11 is a diagram showing the relationship between the pressure [MPa] and the elapsed time [s] of the refrigeration cycle device 100 according to the second embodiment.
  • FIG. 12 is a flow diagram showing an example of control of the refrigeration cycle device 100 according to the second embodiment.
  • the operation of the refrigeration cycle apparatus 100 according to the second embodiment is the same as that of the refrigeration cycle apparatus 100 according to the first embodiment except for the conditions for opening the first gate valve 52 and the second gate valve 53.
  • the refrigeration cycle apparatus 100 according to the second embodiment differs from the refrigeration cycle apparatus 100 according to the first embodiment in the process of step SP3.
  • the control apparatus 80 of the first embodiment determines whether a predetermined set time S1 has elapsed since the operation stop of the refrigeration cycle apparatus 100. (Step SP3).
  • control device 80 of the first embodiment receives a command to stop the operation of the refrigeration cycle device 100, and after a predetermined set time S1 has elapsed since the stop of the operation of the refrigeration cycle device 100, the control device 80 controls the first gate valve 52 and the first gate valve 52. The two gate valves 53 are opened (step SP4).
  • the control device 80 of the second embodiment receives a command to stop the operation of the refrigeration cycle device 100
  • the detected pressure which is the pressure detected by the suction pressure sensor 60
  • the set pressure P2 It is determined whether or not this is the case (step SP3).
  • the set pressure P2 is a pressure that is stored in advance in the storage unit 82 as the upper limit of the design pressure of the device when the refrigeration cycle device 100 is used.
  • the set pressure P2 becomes a threshold value for opening the first gate valve 52 and the second gate valve 53.
  • control device 80 of the second embodiment determines that the detected pressure, which is the pressure detected by the suction pressure sensor 60, is equal to or higher than the set pressure P2, the control device 80 opens the first gate valve 52 and the second gate valve 53 ( Step SP4).
  • the control device 80 and the suction pressure sensor 60 are in operation and can exhibit their respective functions.
  • the control device 80 stores in advance the detected pressure, which is the pressure detected by the suction pressure sensor 60, as the upper limit of the design pressure of the device when the refrigeration cycle device 100 is used when the refrigeration cycle device 100 is stopped. It is determined whether or not the set pressure P2 is higher than the set pressure P2. Then, the control device 80 opens the first gate valve 52 and the second gate valve 53 when the detected pressure is equal to or higher than the set pressure P2. Note that the suction pressure sensor 60 can also be used when closing the first gate valve 52 and the second gate valve 53.
  • the control device 80 determines that sufficient refrigerant has come out from the buffer tank 51 based on the pressure on the suction side of the compressor 10 detected by the suction pressure sensor 60, the second gate valve 53 is closed.
  • a suction pressure sensor 60 is provided in the second pipe 79 or the buffer tank 51, and the state of the refrigerant is determined from the pressure value.
  • the timing for closing the first gate valve 52 or the second gate valve 53 may be determined.
  • the refrigeration cycle device 100 operates the first gate valve 52 and the first gate valve in conjunction with the measurement value of an existing low-pressure side suction pressure sensor 60, for example, a pressure sensor attached to the suction side of the compressor 10.
  • the two-gate valve 53 may also be controlled.
  • the refrigeration cycle device 100 according to the second embodiment provides a storage tank 50 to the existing refrigeration cycle device, and makes minor changes by reusing the existing low-pressure side suction pressure sensor 60 and control of the control device 80. You can respond with
  • the control device 80 stores in advance the detected pressure, which is the pressure detected by the suction pressure sensor 60, as the upper limit of the design pressure of the device when the refrigeration cycle device 100 is used when the refrigeration cycle device 100 is stopped. It is determined whether or not the set pressure P2 is higher than the set pressure P2. The control device 80 opens the first gate valve 52 and the second gate valve 53 when the detected pressure is equal to or higher than the set pressure P2.
  • the refrigeration cycle device 100 according to the second embodiment performs the first operation only when the pressure in the refrigerant pipe 75 increases excessively by control based on the measured value of the suction pressure sensor 60 when the operation of the refrigeration cycle device 100 is stopped. Open the gate valve 52 and the second gate valve 53. Therefore, the refrigeration cycle device 100 according to the second embodiment can appropriately control the timing of the first gate valve 52 and the second gate valve 53, compared to the case where the measurement value of the suction pressure sensor 60 is not used. The number of times the first gate valve 52 and the second gate valve 53 are controlled can be reduced.
  • the refrigeration cycle apparatus 100 according to the second embodiment has the same configuration as the refrigeration cycle apparatus 100 according to the first embodiment, it exhibits the same effects as the refrigeration cycle apparatus 100 according to the first embodiment. can be done.
  • the refrigeration cycle apparatus 100 utilizes the detection data of the suction pressure sensor 60 when stopping the operation of the refrigeration cycle apparatus 100 in step SP2 and starting the operation of the refrigeration cycle apparatus 100 in step SP5. Good too.
  • the control device 80 of the second embodiment determines that the detected pressure, which is the pressure detected by the suction pressure sensor 60, is equal to or higher than the first threshold SH1
  • the control device 80 may stop the operation of the refrigeration cycle device 100.
  • the control device 80 of the second embodiment determines that the detected pressure, which is the pressure detected by the suction pressure sensor 60, is less than or equal to the second threshold SH2
  • the control device 80 may start the operation of the refrigeration cycle device 100. .
  • FIG. 13 is a refrigerant circuit diagram of the refrigeration cycle device 100 according to the third embodiment.
  • FIG. 14 is a functional block diagram showing an example of the configuration of control device 80 shown in FIG. 13. Components having the same functions and actions as those of the refrigeration cycle apparatus 100 according to the first embodiment or the second embodiment are designated by the same reference numerals and the description thereof will be omitted.
  • the differences between the third embodiment and the first embodiment or the second embodiment will be mainly explained, and the configuration not explained in the third embodiment is the same as the first embodiment or the second embodiment.
  • the refrigeration cycle device 100 includes an intake temperature sensor 61 in the refrigerant circuit 70.
  • the suction temperature sensor 61 detects the temperature of refrigerant sucked into the compressor 10.
  • the suction temperature sensor 61 is provided between the suction port 10a of the compressor 10 and the storage tank section 50.
  • the suction temperature sensor 61 detects the temperature of the refrigerant by, for example, measuring the pipe temperature of the refrigerant pipe 75 connected to the suction port 10a of the compressor 10.
  • the suction temperature sensor 61 detects the temperature of the refrigerant sucked into the compressor 10, which is the temperature on the low pressure side, and supplies the detected temperature data to the operating state determination section 81 of the control device 80.
  • the operating state determination unit 81 determines the operation of the refrigeration cycle device 100 based on the above-mentioned operating information of the refrigeration cycle device 100, the temperature data detected by the suction temperature sensor 61, and the control information stored in the storage unit 82. Control.
  • FIG. 15 is a flow diagram showing an example of control of the refrigeration cycle device 100 according to the third embodiment.
  • the operation of the refrigeration cycle apparatus 100 according to the third embodiment is the same as that of the refrigeration cycle apparatus 100 according to the first embodiment except for the conditions for opening the first gate valve 52 and the second gate valve 53.
  • the refrigeration cycle apparatus 100 according to the third embodiment differs from the refrigeration cycle apparatus 100 according to the first embodiment in the process of step SP3. As shown in FIG. 15, when the control device 80 of the third embodiment receives a command to stop operation of the refrigeration cycle device 100, the detected temperature, which is the temperature detected by the suction temperature sensor 61, is equal to or higher than the set temperature TE. It is determined whether or not (step SP3).
  • the set temperature TE is a temperature that is stored in advance in the storage unit 82 as an upper limit value when using the refrigeration cycle device 100.
  • the set temperature TE becomes a threshold value for opening the first gate valve 52 and the second gate valve 53.
  • the control device 80 of the third embodiment determines that the detected temperature, which is the temperature detected by the suction temperature sensor 61, is equal to or higher than the set temperature TE, the control device 80 opens the first gate valve 52 and the second gate valve 53 ( Step SP4).
  • the control device 80 and the suction temperature sensor 61 are in operation and can exert their respective functions.
  • the control device 80 sets the detected temperature, which is the temperature detected by the suction temperature sensor 61, to a set temperature TE that is stored in advance as an upper limit when the refrigeration cycle device 100 is used. Determine whether or not the above is true. Then, the control device 80 opens the first gate valve 52 and the second gate valve 53 when the detected temperature is equal to or higher than the set temperature TE.
  • the refrigeration cycle device 100 may use the detection data of the suction temperature sensor 61 when stopping the operation of the refrigeration cycle device 100 in step SP2 and starting the operation of the refrigeration cycle device 100 in step SP5. .
  • the control device 80 of the third embodiment determines that the detected temperature, which is the temperature detected by the suction temperature sensor 61, is equal to or higher than the first threshold value ST1
  • the control device 80 may stop the operation of the refrigeration cycle device 100.
  • the control device 80 of the third embodiment determines that the detected temperature, which is the temperature detected by the suction temperature sensor 61, is equal to or lower than the second threshold value ST2
  • the control device 80 may start the operation of the refrigeration cycle device 100. .
  • the refrigeration cycle device 100 operates the first gate valve 52 and the The two-gate valve 53 may also be controlled.
  • the refrigeration cycle device 100 according to the third embodiment provides a storage tank 50 to the existing refrigeration cycle device, and makes minor changes by reusing the existing low-pressure side suction temperature sensor 61 and control of the control device 80. You can respond with
  • the refrigeration cycle device 100 may perform control by converting the temperature detected by the suction temperature sensor 61 into pressure.
  • the control device 80 of the refrigeration cycle device 100 performs control according to a control flow as shown in FIG. 12, for example. That is, the refrigeration cycle apparatus 100 uses the suction temperature sensor 61 instead of the suction pressure sensor 60 in the control shown in FIG.
  • suction temperature sensor 61 can also be used when closing the first gate valve 52 and the second gate valve 53.
  • the control device 80 of the refrigeration cycle device 100 determines the state of the refrigerant from the detected value of the suction temperature sensor 61, and controls the first gate valve 52 or the second gate valve 53. You can decide when to close it.
  • the control device 80 sets the detected temperature, which is the temperature detected by the suction temperature sensor 61, to a set temperature TE that is stored in advance as an upper limit when the refrigeration cycle device 100 is used. Determine whether or not the above is true.
  • the control device 80 opens the first gate valve 52 and the second gate valve 53 when the detected temperature is equal to or higher than the set temperature TE.
  • the refrigeration cycle device 100 according to the third embodiment performs the first operation only when the temperature inside the refrigerant pipe 75 rises excessively by control based on the measured value of the suction temperature sensor 61 when the operation of the refrigeration cycle device 100 is stopped. Open the gate valve 52 and the second gate valve 53. Therefore, the refrigeration cycle device 100 according to the third embodiment can appropriately control the timing of the first gate valve 52 and the second gate valve 53, compared to the case where the measurement value of the suction temperature sensor 61 is not used. The number of times the first gate valve 52 and the second gate valve 53 are controlled can be reduced.
  • the refrigeration cycle apparatus 100 according to the third embodiment has the same configuration as the refrigeration cycle apparatus 100 according to the first embodiment, it exhibits the same effects as the refrigeration cycle apparatus 100 according to the first embodiment. can be done.
  • FIG. 16 is a refrigerant circuit diagram of the refrigeration cycle device 100 according to the fourth embodiment.
  • FIG. 17 is a functional block diagram showing an example of the configuration of control device 80 shown in FIG. 16.
  • Components having the same functions and actions as those of the refrigeration cycle apparatus 100 according to Embodiments 1 to 3 are given the same reference numerals, and the explanation thereof will be omitted.
  • the differences between the fourth embodiment and the first to third embodiments will be mainly explained, and the configurations not explained in the fourth embodiment are the same as the first to third embodiments.
  • the storage tank section 50 of the fourth embodiment has pipes provided in parallel, and one of the pipes provided in parallel includes a buffer tank 51 for storing refrigerant and a first partition located upstream of the buffer tank 51. It has a valve 52 and a second gate valve 53 which is a check valve and is located downstream of the buffer tank 51.
  • the refrigeration cycle device 100 according to the fourth embodiment includes a second gate valve 53a in the second pipe 79 of the storage tank section 50.
  • the second gate valve 53a of the fourth embodiment is provided at the position of the second gate valve 53 of the first embodiment. That is, in the direction in which the refrigerant flows through the storage tank 50, the second gate valve 53a is provided at a downstream position with respect to the buffer tank 51.
  • the second gate valve 53a is a check valve. In the storage tank section 50 of the refrigeration cycle device 100, the refrigerant flows from the buffer tank 51 to the suction port 10a side of the compressor 10 by the second gate valve 53a, but the refrigerant does not flow from the suction port 10a side of the compressor 10 to the buffer tank 51. Not flowing.
  • the opening degree of only the first gate valve 52 is controlled by the control device 80. That is, the opening degree of the second gate valve 53a is not controlled by the control device 80.
  • FIG. 18 is a flow diagram showing an example of control of the refrigeration cycle device 100 according to the fourth embodiment. Next, the flow of the refrigerant in the storage tank 50 and the control by the control device 80 will be described using FIG. 18.
  • the control device 80 maintains the first gate valve 52 in a fully closed state and closes the refrigerant circuit 70 of the second pipe 79 (step SP1). Therefore, during operation of the refrigeration cycle apparatus 100, the refrigerant does not flow through the refrigerant circuit 70 of the second pipe 79 but flows through the refrigerant circuit 70 of the first pipe 78.
  • the control device 80 receives a command to stop the operation of the refrigeration cycle device 100, the control device 80 stops the operation of the compressor 10.
  • the control device 80 stops the operation of the refrigeration cycle device 100 by comparing the detection data of the above-mentioned suction pressure sensor 60 or suction temperature sensor 61 with a threshold value stored in the storage section 82.
  • control device 80 Upon receiving the instruction to stop the operation of the refrigeration cycle device 100, the control device 80 determines whether a predetermined set time S1 has elapsed since the operation of the refrigeration cycle device 100 was stopped (step SP3).
  • the control device 80 receives a command to stop the operation of the refrigeration cycle device 100, and opens the first gate valve 52 after a predetermined set time S1 has elapsed since the operation of the refrigeration cycle device 100 was stopped (step SP4).
  • the control device 80 adjusts the opening degree of the first gate valve 52 to a predetermined amount. For example, upon receiving a command to stop operation of the refrigeration cycle device 100, the control device 80 fully opens the first gate valve 52.
  • the control device 80 opens the first gate valve 52 after a preset time S1 has elapsed since the refrigeration cycle device 100 was stopped.
  • the control device 80 opens the first gate valve 52 when the refrigeration cycle device 100 is stopped in a state where the compressor 10 is driven and the first gate valve 52 is maintained in a fully closed state.
  • the first gate valve 52 provided in the second pipe 79 opens, the refrigerant flows through the second pipe 79.
  • the refrigerant that has passed through the first gate valve 52 flows into the buffer tank 51 and is stored therein.
  • the refrigeration cycle apparatus 100 can suppress the pressure increase in the low-pressure side piping by letting the refrigerant in the low-pressure side piping escape into the buffer tank 51.
  • the control device 80 closes the first gate valve 52 after the start of operation of the refrigeration cycle device 100 to drain the refrigerant in the buffer tank 51. It is moved to the main refrigerant circuit 70.
  • control device 80 when the control device 80 receives a command to start the operation of the refrigeration cycle device 100, the control device 80 starts the operation of the compressor 10 and starts the operation of the refrigeration cycle device 100 (step SP5). .
  • the control device 80 determines whether a predetermined set time S2 has elapsed since the start of operation of the refrigeration cycle device 100 (step SP6).
  • the control device 80 receives the command to start the operation of the refrigeration cycle device 100, closes the first gate valve 52 after a predetermined set time S2 has elapsed since the start of the operation of the refrigeration cycle device 100, and closes the first gate valve 52.
  • the opening degree is adjusted to a predetermined amount (step SP7). For example, upon receiving a command to start operation of the refrigeration cycle device 100, the control device 80 fully closes the first gate valve 52. When starting the operation of the refrigeration cycle device 100, the control device 80 fully closes the first gate valve 52 after a preset time S2 has elapsed since the start of the operation of the refrigeration cycle device 100.
  • the control device 80 may perform control as follows.
  • the control device 80 stores in advance the detected pressure, which is the pressure detected by the suction pressure sensor 60, as the upper limit of the design pressure of the device when the refrigeration cycle device 100 is used when the refrigeration cycle device 100 is stopped. It is determined whether or not the set pressure P2 is higher than the set pressure P2 (step SP3).
  • the control device 80 opens the first gate valve 52 when the detected pressure is equal to or higher than the set pressure P2.
  • the control device 80 may perform control as follows.
  • the control device 80 sets the detected temperature, which is the temperature detected by the suction temperature sensor 61, to a set temperature TE that is stored in advance as an upper limit when the refrigeration cycle device 100 is used. It is determined whether or not this is the case (step SP3).
  • the control device 80 opens the first gate valve 52 when the detected temperature is equal to or higher than the set temperature TE.
  • the refrigeration cycle device 100 is provided between the pressure reducing device 30 and the suction port 10a of the compressor 10, and includes a storage tank portion 50 through which the refrigerant flowing therethrough passes or for storing the refrigerant flowing therein.
  • the storage tank section 50 has pipes arranged in parallel, and one of the pipes arranged in parallel includes a buffer tank 51 for storing refrigerant, a first gate valve 52 located upstream of the buffer tank 51, and a buffer tank 51 that stores a refrigerant. It has a second gate valve 53 that is a check valve located downstream of the tank 51.
  • the control device 80 opens the first gate valve 52 when the refrigeration cycle device 100 is stopped in a state where the compressor 10 is driven and the first gate valve 52 is maintained in a fully closed state.
  • the refrigeration cycle device 100 controls the pressure of the low-pressure side piping between the pressure reducing device 30 and the compressor 10 when the device is stopped, even when using a refrigerant with a high operating pressure after retrofitting. can be released into the buffer tank 51 of the storage tank section 50. Therefore, the refrigeration cycle device 100 can prevent the pressure inside the device from exceeding the design pressure of the device while the device is stopped.
  • the storage tank section 50 of the refrigeration cycle device 100 has a first pipe 78 and a second pipe 79 that constitute a parallel refrigerant circuit.
  • the first pipe 78 is provided to connect the upstream pipe 76 and the downstream pipe 77
  • the second pipe 79 includes a first gate valve 52, a buffer tank 51, and a check valve.
  • a second gate valve 53a is provided.
  • the refrigeration cycle device 100 since the second gate valve 53a is a check valve, it is possible to prevent the refrigerant from flowing back into the buffer tank 51 from the side where the compressor 10 is disposed.
  • the refrigeration cycle device 100 according to the fourth embodiment eliminates the need to perform opening/closing control of the second gate valve 53a located downstream of the buffer tank 51. , the refrigeration cycle device 100 can be easily controlled.
  • the refrigeration cycle apparatus 100 uses the first gate valve 52 and the buffer tank 51 to reduce the pressure of the low-pressure side piping to the storage tank 50 when the apparatus is stopped. It can be released into the buffer tank 51. Therefore, the refrigeration cycle device 100 can prevent the pressure inside the device from exceeding the design pressure of the device while the device is stopped, even when using a refrigerant with a high operating pressure after retrofitting.
  • a refrigerant with a low GWP users do not need to replace the refrigeration cycle equipment they are currently using or replace equipment such as compressors, and can reduce the cost of installing refrigeration cycle equipment. Construction period can be shortened.
  • the control device 80 opens the first gate valve 52 after a preset time S1 has elapsed since the refrigeration cycle device 100 stopped operating.
  • the refrigeration cycle device 100 can reduce the number of times the first gate valve 52 is controlled by setting the set time S1 in association with the rising pressure within the device.
  • the control device 80 controls the detected pressure, which is the pressure detected by the suction pressure sensor 60, as the upper limit of the design pressure of the apparatus when the refrigeration cycle apparatus 100 is used. It is determined whether the pressure is equal to or higher than a pre-stored set pressure P2.
  • the control device 80 opens the first gate valve 52 when the detected pressure is equal to or higher than the set pressure P2. Therefore, the refrigeration cycle apparatus 100 can control the first gate valve 52 at appropriate timing and reduce the number of times the first gate valve 52 is controlled, compared to a case where the measurement value of the suction pressure sensor 60 is not used. can.
  • the control device 80 sets the detected temperature, which is the temperature detected by the suction temperature sensor 61, to a set temperature TE that is stored in advance as an upper limit when the refrigeration cycle device 100 is used. Determine whether or not the above is true.
  • the control device 80 opens the first gate valve 52 when the detected temperature is equal to or higher than the set temperature TE. Therefore, the refrigeration cycle device 100 can control the first gate valve 52 at appropriate timing and reduce the number of times the first gate valve 52 is controlled, compared to a case where the measurement value of the suction temperature sensor 61 is not used. can.
  • the control device 80 When starting the operation of the refrigeration cycle device 100, the control device 80 fully closes the first gate valve 52 after a preset time S2 has elapsed since the start of the operation of the refrigeration cycle device 100.
  • the refrigeration cycle apparatus 100 can reduce the number of times the first gate valve 52 is controlled by setting the set time S2 in association with the decreasing pressure within the apparatus.
  • the refrigeration cycle device 100 may be a combination of Embodiments 1 to 4.

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

Abstract

Le présent dispositif à cycle frigorifique comprend un compresseur, un premier échangeur thermique, un dispositif de réduction de pression, un second échangeur thermique, une unité de réservoir de stockage qui permet à un fluide frigorigène s'écoulant à travers un intérieur de celui-ci de passer ou de stocker le fluide frigorigène s'écoulant à travers l'intérieur de celui-ci, une conduite de fluide frigorigène formant un circuit de fluide frigorigène, et un dispositif de commande : l'unité de réservoir de stockage comprend des pipelines qui sont disposés en parallèle et comprend, dans l'un des pipelines qui sont disposés en parallèle, un réservoir tampon pour stocker le réfrigérant, un premier robinet-vanne positionné en amont du réservoir tampon et un second robinet-vanne positionné en aval du réservoir tampon ; et si le dispositif à cycle frigorifique s'arrête de fonctionner dans un état dans lequel le premier robinet-vanne et le second robinet-vanne sont maintenus dans un état complètement fermé, le dispositif de commande ouvre le premier robinet-vanne et le second robinet-vanne.
PCT/JP2022/017671 2022-04-13 2022-04-13 Dispositif à cycle frigorifique WO2023199420A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/017671 WO2023199420A1 (fr) 2022-04-13 2022-04-13 Dispositif à cycle frigorifique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/017671 WO2023199420A1 (fr) 2022-04-13 2022-04-13 Dispositif à cycle frigorifique

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WO2023199420A1 true WO2023199420A1 (fr) 2023-10-19

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06159831A (ja) * 1992-11-19 1994-06-07 Shin Meiwa Ind Co Ltd 冷凍装置
JPH10238872A (ja) * 1997-02-24 1998-09-08 Zexel Corp 炭酸ガス冷凍サイクル
JP2011521194A (ja) * 2008-05-14 2011-07-21 キャリア コーポレイション 冷媒蒸気圧縮システムにおける充填管理

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06159831A (ja) * 1992-11-19 1994-06-07 Shin Meiwa Ind Co Ltd 冷凍装置
JPH10238872A (ja) * 1997-02-24 1998-09-08 Zexel Corp 炭酸ガス冷凍サイクル
JP2011521194A (ja) * 2008-05-14 2011-07-21 キャリア コーポレイション 冷媒蒸気圧縮システムにおける充填管理

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