WO2012137260A1 - Procédé de récupération de fluide frigorigène pour dispositif de cycle de réfrigération et dispositif de cycle de réfrigération - Google Patents

Procédé de récupération de fluide frigorigène pour dispositif de cycle de réfrigération et dispositif de cycle de réfrigération Download PDF

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Publication number
WO2012137260A1
WO2012137260A1 PCT/JP2011/002098 JP2011002098W WO2012137260A1 WO 2012137260 A1 WO2012137260 A1 WO 2012137260A1 JP 2011002098 W JP2011002098 W JP 2011002098W WO 2012137260 A1 WO2012137260 A1 WO 2012137260A1
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Prior art keywords
refrigerant
refrigeration cycle
flammable
combustible
mixed
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PCT/JP2011/002098
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English (en)
Japanese (ja)
Inventor
山下　浩司
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三菱電機株式会社
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Priority to PCT/JP2011/002098 priority Critical patent/WO2012137260A1/fr
Publication of WO2012137260A1 publication Critical patent/WO2012137260A1/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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • 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
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/002—Collecting refrigerant from a cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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

Definitions

  • the present invention relates to a refrigerant recovery method and a refrigeration cycle apparatus for a refrigeration cycle apparatus such as a room air conditioner or a building multi-air conditioner using a flammable refrigerant as a refrigerant.
  • refrigerant circulating in the refrigeration cycle is often recovered using a refrigerant recovery apparatus.
  • Fluorocarbon refrigerant recovery devices usually do not have an explosion-proof structure that can recover flammable refrigerants. Therefore, if a combustible refrigerant is recovered using such a conventional refrigerant recovery device for CFC, there is a possibility of causing ignition or explosion.
  • An object of the present invention is to provide a refrigerant recovery method and a refrigeration cycle apparatus for a refrigeration cycle apparatus that can be safely recovered.
  • the refrigerant recovery method of the refrigeration cycle apparatus includes a compressor, a first heat exchanger, a first expansion device, and a second heat exchanger connected by a refrigerant pipe to circulate a flammable refrigerant,
  • a refrigerant recovery method for a refrigeration cycle for recovering a flammable refrigerant wherein a predetermined amount of a nonflammable refrigerant is mixed with the flammable refrigerant circulating in the refrigeration cycle to generate a nonflammable mixed refrigerant.
  • the combustible refrigerant is recovered as the non-combustible mixed refrigerant.
  • the refrigeration cycle apparatus includes a refrigeration cycle in which a compressor, a first heat exchanger, a first expansion device, and a second heat exchanger are connected by a refrigerant pipe to circulate a combustible refrigerant, and the refrigeration cycle
  • a refrigerant outlet connected to the refrigerant outlet
  • a refrigerant mixing device connected to the refrigerant outlet
  • an incombustible refrigerant cylinder detachably connected to the refrigerant outlet via the refrigerant mixer
  • the non-combustible refrigerant and the combustible refrigerant circulating in the refrigerating cycle are detachably connected to the refrigerant take-out portion via the non-combustible cylinder and sealed in the refrigerating cycle via the non-combustible cylinder.
  • a refrigerant recovery device that recovers the mixed refrigerant, and the nonflammable mixed refrigerant that is connected to the refrigerant recovery device and in which the combustible refrigerant and the nonflammable refrigerant are mixed in the refrigerant mixing device by the action of the refrigerant recovery device
  • the A refrigerant recovery cylinder is cut, in those having a refrigerant recovery mechanism configured.
  • the flammable refrigerant in the refrigeration cycle can be recovered safely without igniting.
  • FIG. 1 is a schematic circuit diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus 100 according to Embodiment 1 of the present invention. Based on FIG. 1, the configuration, operation, and refrigerant recovery method of the refrigeration cycle apparatus 100 will be described. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one. Further, in the following drawings including FIG. 1, the same reference numerals denote the same or equivalent parts, and this is common throughout the entire specification. Furthermore, the forms of the constituent elements shown in the entire specification are merely examples, and are not limited to these descriptions.
  • the refrigeration cycle apparatus 100 can perform a cooling operation (for example, a cooling operation) or a heating operation (for example, a heating operation) by using a refrigeration cycle in which a refrigerant is circulated. It is used for freezers, vending machines, air conditioners, showcases, heat pump water heaters, and the like. In the following description, a state where the refrigeration cycle apparatus 100 is applied to an air conditioner will be described as an example.
  • the refrigeration cycle apparatus 100 includes an outdoor unit 1 that is a heat source unit and an indoor unit 2 that is a use side unit.
  • the outdoor unit 1 and the indoor unit 2 are connected by a refrigerant pipe 4 (refrigerant pipe 4 (1) and refrigerant pipe 4 (2) that conducts the refrigerant, and the cold or hot heat generated by the outdoor unit 1 is the indoor unit.
  • the refrigerant recovery mechanism 50 is connected to the refrigerant pipe 4 (2) between the expansion device 16 and the use side heat exchanger 13.
  • the outdoor unit 1 is normally disposed in an outdoor space (for example, a rooftop) of a building or the like, and the indoor unit 2 supplies cold or hot heat to the indoor unit 2.
  • the indoor unit 2 is disposed at a position where cooling air or heating air can be supplied to an indoor space (for example, a living room) inside the building, and supplies the cooling air or heating air to the indoor space that is the air-conditioning target space.
  • the refrigerant recovery mechanism 50 is used when recovering the refrigerant circulating in the refrigeration cycle.
  • a flammable refrigerant is used as the refrigerant.
  • R32 difluoromethane
  • HFO1234yf may be mixed at a ratio of 80%, R32 may be mixed at 20%, etc., but the mixing ratio is not particularly limited, and any mixing ratio may be used.
  • a highly flammable refrigerant such as R290 (propane) may be used.
  • Outdoor unit 1 In the outdoor unit 1, a compressor 10, a refrigerant flow switching device 11 such as a four-way valve, a heat source side heat exchanger (first heat exchanger) 12, and a throttle device 16 are connected in series by a refrigerant pipe 4. Has been installed.
  • the compressor 10 sucks the refrigerant and compresses the refrigerant to a high temperature / high pressure state, and may be composed of, for example, an inverter compressor capable of capacity control.
  • the refrigerant flow switching device 11 switches the refrigerant flow during the heating operation and the refrigerant flow during the cooling operation.
  • the heat source side heat exchanger 12 functions as an evaporator during heating operation, functions as a condenser (or radiator) during cooling operation, and between air supplied from a blower such as a fan (not shown) and the heat source side refrigerant. Heat exchange is performed to evaporate or condense the heat-source-side refrigerant.
  • the expansion device 16 has a function as a pressure reducing valve or an expansion valve, and expands the refrigerant by reducing the pressure.
  • the expansion device 16 may be composed of an electronic expansion valve or the like.
  • the indoor unit 2 is equipped with a use side heat exchanger (second heat exchanger) 13.
  • the use side heat exchanger 13 is connected to the expansion device 16 and the refrigerant flow switching device 11 mounted in the outdoor unit 1 by the refrigerant pipe 4 (refrigerant pipe 4 (1), refrigerant pipe 4 (2)). It is like that.
  • the use side heat exchanger 13 exchanges heat between air supplied from a blower such as a fan (not shown) and a heat medium, and generates heating air or cooling air to be supplied to the indoor space. Is.
  • the refrigerant recovery mechanism 50 includes an extraction pipe (refrigerant extraction part) 31, a connection valve (open / close valve) 32, a hose 33, a refrigerant recovery device 34, a refrigerant recovery cylinder 35, and an incombustible refrigerant cylinder 36. ing.
  • the extraction pipe 31 is connected to the refrigerant pipe 4 (2) between the expansion device 16 and the use-side heat exchanger 13, and the refrigerant conducts when the refrigerant is sealed or collected.
  • the connection valve 32 is installed in the extraction pipe 31 and opens and closes the extraction pipe 31 when enclosing the refrigerant or collecting the refrigerant.
  • the hose 33 connects the connection valve 32 and the refrigerant recovery device 34 so that the refrigerant is conducted when the refrigerant is recovered.
  • the refrigerant recovery device 34 is driven to cause the refrigerant to conduct from the refrigerant pipe 4 (2) to the extraction pipe 31 and the hose 33.
  • the refrigerant recovery cylinder 35 recovers the refrigerant that has flowed through the extraction pipe 31 and the hose 33 by driving the refrigerant recovery device 34.
  • the non-combustible refrigerant cylinder 36 is one in which an incombustible refrigerant sealed in the refrigeration cycle is stored.
  • a low-temperature / low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature / high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12 via the refrigerant flow switching device 11. Then, the heat source side heat exchanger 12 condenses and liquefies while radiating heat to the outdoor air, and becomes a high-pressure liquid refrigerant.
  • the high-pressure liquid refrigerant that has flowed out of the heat source side heat exchanger 12 is expanded by the expansion device 16 and becomes a low-temperature, low-pressure two-phase refrigerant. This two-phase refrigerant flows out of the outdoor unit 1 and flows into the indoor unit 2 through the refrigerant pipe 4 (2).
  • the two-phase refrigerant that has flowed into the indoor unit 2 flows into the use-side heat exchanger 13 that acts as an evaporator.
  • the two-phase refrigerant that has flowed into the use-side heat exchanger 13 absorbs heat from the indoor air in the use-side heat exchanger 13 to be evaporated and becomes a low-temperature / low-pressure gas refrigerant.
  • the indoor unit 2 cools the indoor space.
  • the low-temperature and low-pressure gas refrigerant that has flowed out of the use-side heat exchanger 13 flows out of the indoor unit 2 and flows into the outdoor unit 1 again through the refrigerant pipe 4 (1).
  • the gas refrigerant that has flowed into the outdoor unit 1 is again sucked into the compressor 10 via the refrigerant flow switching device 11.
  • a low-temperature / low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature / high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows out of the outdoor unit 1 through the refrigerant flow switching device 11, and flows into the indoor unit 2 through the refrigerant pipe 4 (1).
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor unit 2 flows into the use-side heat exchanger 13.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the use-side heat exchanger 13 is condensed and liquefied while dissipating heat to the indoor air in the use-side heat exchanger 13, and becomes high-pressure liquid refrigerant.
  • the indoor unit 2 heats the indoor space 7.
  • the high-pressure liquid refrigerant that has flowed out of the use-side heat exchanger 13 flows out of the indoor unit 2 and flows into the outdoor unit 1 again through the refrigerant pipe 4 (2).
  • the high-pressure liquid refrigerant flowing into the outdoor unit 1 is expanded by the expansion device 16 and becomes a low-temperature / low-pressure two-phase refrigerant.
  • This two-phase refrigerant flows into the heat source side heat exchanger 12 acting as an evaporator.
  • the two-phase refrigerant that has flowed into the heat source side heat exchanger 12 absorbs heat from outdoor air in the heat source side heat exchanger 12 to be evaporated and gasified into a low-temperature / low-pressure gas refrigerant, and through the refrigerant flow switching device 11, It is sucked into the compressor 10 again.
  • FIG. 2 is a system configuration diagram for explaining the refrigerant recovery operation executed by the refrigeration cycle apparatus 100.
  • FIG. 3 is a flowchart showing the flow of the refrigerant recovery operation performed by the refrigeration cycle apparatus 100. The refrigerant recovery operation when recovering the combustible refrigerant from the refrigeration cycle apparatus 100 will be described with reference to FIGS.
  • the refrigerant circulating inside the refrigerant pipe 4 is recovered in a recovery cylinder and then failed. Parts need to be repaired. If the refrigerant is released into the atmosphere without being collected, the global warming will progress. Therefore, the global warming can be prevented from being accelerated by collecting the refrigerant. Also, when the refrigeration cycle apparatus 100 is deteriorated and discarded, it is necessary to recover the refrigerant from the viewpoint of suppressing global warming.
  • the refrigerant recovery mechanism 50 is connected to the refrigeration cycle apparatus 100 as described above.
  • the refrigerant recovery device 34 is stopped and the connection valve 32 is closed so that the refrigerant does not flow outside. It has become.
  • the refrigerant recovery apparatus 34 is driven, the connection valve 32 is opened, and the refrigerant is recovered in the refrigerant recovery cylinder 35 via the extraction pipe 31 and the hose 33. It is like that.
  • the refrigerant recovery device 34 used for recovery of the chlorofluorocarbon refrigerant is usually not explosion-proof. Therefore, if a flammable refrigerant is used as the refrigerant and the refrigerant is recovered using the refrigerant recovery device 34, the refrigerant may ignite and explode. Therefore, when recovering the flammable refrigerant, a new countermeasure for recovering the refrigerant is required. Therefore, the refrigeration cycle apparatus 100 takes measures as described below.
  • a combustible refrigerant has a property of becoming nonflammable when a specific amount or more of a specific nonflammable refrigerant is mixed. The combination of the incombustible combustible refrigerant and the incombustible refrigerant will be described later.
  • the flammable refrigerant circulating in the refrigeration cycle apparatus 100 becomes a mixed refrigerant with the nonflammable refrigerant and becomes nonflammable. Thereafter, the connection valve 32 is closed, and the nonflammable refrigerant cylinder 36 is removed from the connection valve 32 (ST5). At this time, unless the pressure inside the incombustible refrigerant cylinder 36 is higher than the pressure inside the refrigeration cycle, the refrigerant cannot be sealed from the incombustible refrigerant cylinder 36 into the refrigeration cycle. Therefore, the processing (ST3, ST4) is performed after the compressor 10 is stopped or the refrigerant flow switching device 11 is operated so that the position of the extraction pipe 31 is low.
  • the refrigerant recovery device 34 is connected to the connection valve 32 via the hose 33 (ST6). Then, the connection valve 32 is opened to secure a non-flammable mixed refrigerant flow path, and the non-flammable mixed refrigerant generated in the refrigeration cycle is supplied to the refrigerant recovery cylinder 35 by the action of the refrigerant recovery device 34. (ST7). Then, the refrigerant is recovered until the pressure in the refrigeration cycle becomes less than the set pressure (ST8). When the pressure in the refrigeration cycle becomes less than the set pressure (ST8; Yes), the refrigerant recovery device 34 is removed from the connection valve 32 (ST9). The refrigerant recovery operation is completed by this series of processes (ST10).
  • the present invention is not limited to this.
  • the refrigerant in the refrigeration cycle also depends on whether or not the recovered refrigerant amount has exceeded a specified amount (specified weight). It can be confirmed that is fully recovered.
  • R410A which is a refrigerant often used in a refrigeration cycle apparatus such as an air conditioner
  • R125 which is a flammable refrigerant
  • R125 which is a nonflammable refrigerant
  • R410A is called a pseudo-azeotropic refrigerant.
  • R32 is mixed with 50% by mass and R125 is mixed with 50% by mass.
  • R410B has the same refrigerant component as R410A but having a different mixing ratio.
  • R32 is mixed by 45 mass% and R125 is mixed by 55 mass%. That is, in the mixed refrigerant produced by mixing the flammable refrigerant R32 and the non-flammable refrigerant R125, it is possible to obtain a non-flammable mixed refrigerant by mixing 50 mass% or more of R125.
  • a pseudo-azeotropic incombustible mixed refrigerant can be produced by mixing 62% by mass of HFO1234yf, which is a combustible refrigerant, and 38% by mass of R134a, which is an incombustible refrigerant. Since the boiling point of HFO1234yf is ⁇ 29 ° C. and the boiling point of R134a is ⁇ 26.2 ° C., this mixed refrigerant also becomes a pseudo-azeotropic mixed refrigerant.
  • R32 which is a flammable refrigerant
  • R125 which is a non-flammable refrigerant
  • R134a which is a non-flammable refrigerant
  • R407C 23 mass%: 25 mass%: 52 mass%)
  • R32 has a boiling point of ⁇ 51.8 ° C.
  • R125 has a boiling point of ⁇ 48.5 ° C.
  • R134a has a boiling point of ⁇ 26.2 ° C.
  • refrigerants having greatly different boiling points are mixed. It becomes a non-azeotropic refrigerant mixture. That is, in the mixed refrigerant of R32, R125, and R134a, if the mixed refrigerant has a mixture ratio that is less than the above-mentioned component ratio or the above-mentioned component ratio, the component ratio of R32 that is a flammable refrigerant is incombustible. Can be a mixed refrigerant.
  • nonflammable refrigerants can be produced by mixing nonflammable refrigerants with flammable refrigerants in the refrigeration cycle and having a refrigerant component ratio similar to these prescribed nonflammable mixed refrigerants, The refrigerant can be recovered safely.
  • the mixing ratio is similar to that of the specified non-flammable mixed refrigerant, even if the mixing ratio is not completely the same, the same characteristics are exhibited. There is no particular problem.
  • the present invention is not limited to the combinations described here. Absent. Even if it is a thing other than the combination described here, as long as it can produce a nonflammable mixed refrigerant by combining a combustible refrigerant and a nonflammable refrigerant, any component and mixing ratio may be used.
  • the mixed refrigerant may be a pseudo-azeotropic mixed refrigerant or a non-azeotropic mixed refrigerant.
  • R125, R1234a and other nonflammable refrigerants are mixed and recovered as a nonflammable mixed refrigerant. May be.
  • a refrigeration cycle apparatus is provided by enclosing a specified amount of non-flammable refrigerant in the refrigeration cycle of the refrigeration cycle apparatus 100 from the outside. Incombustible mixed refrigerant can be produced in 100 refrigeration cycles. Therefore, even if the refrigerant recovery device 34 used for refrigerant recovery of the chlorofluorocarbon refrigerant is used, the refrigerant can be recovered safely.
  • FIG. 4 and 5 are schematic circuit diagrams illustrating an example of another refrigerant circuit configuration of the refrigeration cycle apparatus 100.
  • FIG. Based on FIG.4 and FIG.5, enclosure of a nonflammable refrigerant
  • FIG. 4 shows a refrigerant circuit configuration in which an accumulator 18 is installed on the suction side of the compressor 10.
  • FIG. 5 shows a refrigerant circuit configuration in which a receiver (intermediate pressure receiver) 19 is installed between the heat source side heat exchanger 12 and the use side heat exchanger 13.
  • a diaphragm device (a diaphragm device 16a, a diaphragm device 16b) is installed before and after the receiver 19.
  • the mixing ratio of R32 and R125 needs to be 50% by mass to 50% by mass. That is, it is necessary to enclose the same amount of R125 refrigerant as the R32 refrigerant circulating in the refrigeration cycle in the refrigeration cycle.
  • the refrigerant changes into liquid, two-phase, and gas, and the density is the largest in liquid refrigerant, then the two-phase refrigerant, and the smallest is the gas refrigerant.
  • the density ratio of the gas refrigerant is about 1000 times. Therefore, it is technically possible to stop the compressor 10 and enclose the liquid refrigerant in a place where the refrigerant exists in a gas state or a two-phase state.
  • FIG. 4 shows an example in which the expansion device 16 is accommodated in the outdoor unit 1 and FIG. 4 shows an example in which the expansion device 16 is accommodated in the indoor unit 2, but the expansion device 16 is included in the outdoor unit. 1 and indoor unit 2 may be accommodated.
  • an extraction pipe that can put refrigerant into and out of the refrigeration cycle and a connection valve that can open and close the flow path are integrated.
  • it has a service valve that also has the function of connecting an extension pipe. Therefore, it is sufficient to use such a service valve, and it is not necessary to newly provide another one.
  • any material may be used as long as the refrigerant in the refrigeration cycle can be taken in and out and the flow path can be opened and closed.
  • connection valve 32 Furthermore, between the extraction pipe 31 and the connection valve 32, between the connection valve 32 and the refrigerant recovery device 34, between the connection valve 32 and the non-combustible refrigerant cylinder 36, and between the refrigerant recovery device 34 and the refrigerant recovery cylinder 35.
  • the hose 33 is used as an example for the connection, but any connection method may be used as long as the refrigerant is connected so as not to leak to the outside, and the connection is made using copper piping. Alternatively, it may be directly connected using a special connection joint.
  • the refrigerant flow switching device 11 may be a four-way valve, or a plurality of three-way valves or two-way valves may be used.
  • the heat source side heat exchanger 12 and the use side heat exchanger 13 are provided with a blower, and in many cases, condensation or evaporation is promoted by blowing air, but this is not restrictive.
  • a blower for example, as the use side heat exchanger 13, a panel heater using radiation can be used, and as the heat source side heat exchanger 12, a water-cooled type in which heat is transferred by water or antifreeze. Any material can be used as long as it has a structure capable of radiating or absorbing heat.
  • the installation position of the outdoor unit 1 is not limited to the outdoor space, but may be installed in an enclosed space such as a machine room with a vent, and if it is ventilated outdoors, It can be installed.
  • the indoor unit 2 includes a ceiling cassette type, a ceiling-embedded type, a ceiling-suspended type, a wall-mounted type, and the like, so that heating air or cooling air can be blown directly into the indoor space 7 or by a duct or the like. Any kind of material can be used.
  • the number of connected outdoor units 1 and indoor units 2 is shown as one, but the number is not limited to this, and a plurality of indoor units 2 may be attached to one outdoor unit 1, A plurality of outdoor units 1 may be connected to one refrigeration cycle.
  • a repeater is installed between the outdoor unit 1 and the indoor unit 2, and both the cooling and heating are generated by the repeater, and the cooling and heating can be freely selected by the plurality of indoor units 2, and the cooling and heating can be performed simultaneously.
  • the circuit may be configured to operate.
  • the refrigeration cycle apparatus 100 may be a room air conditioner, a packaged air conditioner, or a multi air conditioner for buildings, and includes a refrigeration cycle in which a refrigerant is circulated. Any device can be used.
  • a heat medium converter that houses a heat exchanger for heat medium in which a heat medium such as refrigerant and water exchanges heat, and the outdoor unit 1 and the heat medium converter
  • the circuit may be configured so that the refrigerant is circulated between them and the heat medium is circulated between the heat medium converter and the indoor unit.
  • the heat exchanger between heat media which heat-exchanges heat medium such as a refrigerant
  • coolant is circulated in the outdoor unit 1, and between the outdoor unit 1 and the indoor unit 2 is accommodated.
  • a circuit such as a chiller in which the heat medium circulates may be configured.
  • the non-flammable refrigerant is temporarily sealed in the refrigeration cycle in which the flammable refrigerant circulates, and the generated non-flammable mixed refrigerant is used as the action of the refrigerant recovery apparatus 34.
  • the flammable refrigerant can be safely recovered by collecting the refrigerant in the refrigerant collection cylinder 35.
  • FIG. FIG. 6 is a refrigerant circuit diagram showing a refrigerant circuit configuration of the refrigeration cycle apparatus 200 according to Embodiment 2 of the present invention. Based on FIG. 6, the structure, operation
  • the difference from the first embodiment described above will be mainly described, and parts having the same functions as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.
  • the same reference numerals and description thereof will be omitted.
  • Refrigeration cycle apparatus 200 according to Embodiment 2 is different from refrigeration cycle apparatus 100 according to Embodiment 1 in that refrigerant mixing apparatus 37 is connected.
  • the refrigerant mixing device 37 is connected to the connection valve 32 via the hose 33.
  • the refrigerant mixing device 37 is connected to an incombustible refrigerant cylinder 36 and a refrigerant recovery device 34 via a hose 33.
  • a refrigerant recovery cylinder 35 is connected to the refrigerant recovery device 34 via a hose 33.
  • an extraction pipe (refrigerant extraction part) 31 a connection valve (open / close valve) 32, a hose 33, a refrigerant recovery apparatus 34, a refrigerant recovery cylinder 35, an incombustible refrigerant cylinder 36, and a refrigerant
  • the mixing device 37 constitutes a refrigerant recovery mechanism 50A.
  • the refrigerant mixing device 37 is driven by, for example, a stepping motor or the like, and changes the opening area of the flow path opened on the connection valve 32 side and the opening area of the flow path opened on the nonflammable refrigerant cylinder 36 side. It is good to comprise by the three-way valve etc. which are made to do. If the refrigerant mixing device is constituted by such a three-way valve, the amount of the combustible refrigerant flowing from the connection valve 32 and the nonflammability flowing from the nonflammable refrigerant cylinder 36 are adjusted by adjusting the opening of the refrigerant mixing device 37. The amount of refrigerant can be adjusted to a specified ratio.
  • the removal and connection of the non-combustible refrigerant cylinder 36, the refrigerant recovery apparatus 34, and the refrigerant recovery cylinder 35 can be omitted, and the refrigerant can be easily recovered accordingly. Become.
  • FIG. 7 is a flowchart showing the flow of the refrigerant recovery operation performed by the refrigeration cycle apparatus 200. Based on FIG.6 and FIG.7, the refrigerant
  • coolants from the refrigerating-cycle apparatus 200 is demonstrated.
  • the types and mixing ratios of the flammable refrigerant and the nonflammable refrigerant are the same as those described in the first embodiment.
  • GT1 Treatment for recovering the combustible refrigerant from the refrigeration cycle apparatus 100 is started (GT1).
  • the refrigerant mixing device 37 is connected to the connection valve 32, the refrigerant collecting device 34 and the incombustible refrigerant cylinder 36 are connected to the refrigerant mixing device 37, and the refrigerant collecting cylinder 35 is connected to the refrigerant collecting device 34.
  • GT2 connection valve 32 is opened, the opening degree of the refrigerant mixing device 37 is adjusted, the amount of flammable refrigerant flowing into the refrigerant mixing device 37 from the inside of the refrigeration cycle, and the refrigerant mixing device 37 flowing from the nonflammable refrigerant cylinder 36.
  • the ratio to the amount of non-combustible refrigerant to be set is set to a predetermined specified value (GT3).
  • the mixed refrigerant of the nonflammable combustible refrigerant and the nonflammable refrigerant generated by the refrigerant mixing device 37 is recovered in the refrigerant recovery cylinder 35 via the refrigerant recovery device 34 (GT4). Then, recovery of the refrigerant is continued until the pressure in the refrigeration cycle becomes less than the set pressure (GT5). When the pressure in the refrigeration cycle becomes lower than the set pressure (GT5; Yes), the refrigerant recovery is completed, and the refrigerant mixing device 37 is removed from the connection valve 32 (GT6). The refrigerant recovery operation is completed by this series of processes (GT7).
  • GT7 refrigerant recovery method, only the non-combustible mixed refrigerant flows into the refrigerant recovery device 34, so that the refrigerant can be safely recovered in the refrigerant recovery cylinder 35.
  • first pressure detection device that measures the pressure of the refrigerant in the refrigeration cycle
  • second pressure detection device that measures the pressure of the refrigerant in the incombustible refrigerant cylinder 36.
  • the refrigerant flowing into the refrigerant recovery device 34 can always be an incombustible mixed refrigerant. It will be safer to use.
  • a refrigerant flow rate detection device capable of measuring the flow rate of the combustible refrigerant flowing from the refrigeration cycle device 200 to the refrigerant mixing device 37, and a non-flammable refrigerant cylinder 36 for refrigerant mixing. You may make it provide the refrigerant
  • the refrigerant recovery process for example, if the pressure in the refrigeration cycle apparatus 200 falls below a predetermined value, the refrigerant recovery may be completed assuming that the refrigerant has been sufficiently recovered.
  • a refrigerant flow rate detection device first refrigerant flow rate detection device, second refrigerant flow rate detection device
  • detection based on a detection flow rate of the first refrigerant flow rate detection device and / or a detection flow rate of the third refrigerant flow rate detection device
  • the refrigerant recovery may be completed.
  • the refrigerant recovery operation procedure is reduced, and there is an advantage that the refrigerant can be recovered safely and in a short time.
  • the refrigerant mixing device 37 has been described as an example of a three-way valve.
  • the refrigerant mixing device 37 is not limited to this, and the refrigerant mixing device 37 may have a structure such as an ejector that can suck and mix a fluid from another flow path by a main flow. Good.
  • two open / close valves two-way valves
  • expansion valves driven by a stepping motor or the like may be combined, or a three-way valve or two open / close valves that are manually operated may be combined to suck and mix two fluids. Any structure can be used.
  • the refrigerant mixing device 37 is different from the connection valve 32 and is connected to the connection valve 32 has been described as an example, but the present invention is not limited to this.
  • the refrigerant mixing device 37 has a structure that can completely close the connection port between the refrigerant mixing device 37 and the refrigerant recovery device 34 and the mixing port between the refrigerant mixing device 37 and the nonflammable refrigerant, the refrigerant mixing device The apparatus 37 may be incorporated in the refrigeration cycle apparatus 200 instead of the connection valve 32.
  • a flammable refrigerant circulating in the refrigeration cycle is mixed with a specified amount of an incombustible refrigerant to generate an incombustible mixed refrigerant, and a refrigerant recovery apparatus.
  • the refrigerant can be recovered in the non-combustible refrigerant cylinder 36 via 34, and the refrigerant recovery device 34 can prevent the occurrence of ignition or explosion and can recover the refrigerant safely.
  • the refrigerating and air-conditioning apparatus may be configured by appropriately combining the features of each embodiment. If the embodiments are appropriately combined, the effects of the features of the embodiments can be obtained in a superimposed manner.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

La présente invention concerne un procédé de récupération de fluide frigorigène pour un dispositif de cycle de réfrigération qui est capable d'une récupération sécurisée de fluide frigorigène sans mise à feu du fluide frigorigène lors de la récupération de fluide frigorigène combustible au moyen d'un dispositif de récupération de fluide frigorigène pour Fréon. Un dispositif de cycle de réfrigération (100) génère un fluide frigorigène mixte non combustible par le mélange d'une quantité prédéterminée de fluide frigorigène non combustible et du fluide frigorigène combustible pendant le cycle de réfrigération, et récupère le fluide frigorigène combustible à partir du fluide frigorigène mixte non combustible généré.
PCT/JP2011/002098 2011-04-08 2011-04-08 Procédé de récupération de fluide frigorigène pour dispositif de cycle de réfrigération et dispositif de cycle de réfrigération WO2012137260A1 (fr)

Priority Applications (1)

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PCT/JP2011/002098 WO2012137260A1 (fr) 2011-04-08 2011-04-08 Procédé de récupération de fluide frigorigène pour dispositif de cycle de réfrigération et dispositif de cycle de réfrigération

Applications Claiming Priority (1)

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PCT/JP2011/002098 WO2012137260A1 (fr) 2011-04-08 2011-04-08 Procédé de récupération de fluide frigorigène pour dispositif de cycle de réfrigération et dispositif de cycle de réfrigération

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WO2012137260A1 true WO2012137260A1 (fr) 2012-10-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017018494A1 (fr) * 2015-07-30 2017-02-02 ダイキン工業株式会社 Dispositif de réfrigération
JP7303172B2 (ja) 2015-07-30 2023-07-04 ダイキン工業株式会社 冷凍装置

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JPH0961018A (ja) * 1995-08-30 1997-03-07 Hitachi Ltd 冷媒回収装置
JP2004116885A (ja) * 2002-09-26 2004-04-15 Mitsubishi Electric Corp 冷凍空調サイクル装置の取り扱い方法、冷凍空調サイクル装置の冷媒回収機構
JP2007139375A (ja) * 2005-11-22 2007-06-07 Mac:Kk 可燃性冷媒ガスを使用した冷凍サイクルの発火防止並びに消火方法及びその装置
JP2009542883A (ja) * 2006-07-12 2009-12-03 ゾルファイ フルーオル ゲゼルシャフト ミット ベシュレンクテル ハフツング フルオロエーテル化合物を用いた加熱・冷却方法、これに適した組成物およびその用途
JP2010243136A (ja) * 2009-04-10 2010-10-28 Mitsubishi Electric Corp 可燃性冷媒のエアパージ装置およびエアパージ方法

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JPH0961018A (ja) * 1995-08-30 1997-03-07 Hitachi Ltd 冷媒回収装置
JP2004116885A (ja) * 2002-09-26 2004-04-15 Mitsubishi Electric Corp 冷凍空調サイクル装置の取り扱い方法、冷凍空調サイクル装置の冷媒回収機構
JP2007139375A (ja) * 2005-11-22 2007-06-07 Mac:Kk 可燃性冷媒ガスを使用した冷凍サイクルの発火防止並びに消火方法及びその装置
JP2009542883A (ja) * 2006-07-12 2009-12-03 ゾルファイ フルーオル ゲゼルシャフト ミット ベシュレンクテル ハフツング フルオロエーテル化合物を用いた加熱・冷却方法、これに適した組成物およびその用途
JP2010243136A (ja) * 2009-04-10 2010-10-28 Mitsubishi Electric Corp 可燃性冷媒のエアパージ装置およびエアパージ方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017018494A1 (fr) * 2015-07-30 2017-02-02 ダイキン工業株式会社 Dispositif de réfrigération
JP2017032185A (ja) * 2015-07-30 2017-02-09 ダイキン工業株式会社 冷凍装置
EP3330639A4 (fr) * 2015-07-30 2019-04-17 Daikin Industries, Ltd. Dispositif de réfrigération
US11060773B2 (en) 2015-07-30 2021-07-13 Daikin Industries, Ltd. Refrigerating device
JP7303172B2 (ja) 2015-07-30 2023-07-04 ダイキン工業株式会社 冷凍装置

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