WO2018122943A1 - Climatiseur - Google Patents

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Publication number
WO2018122943A1
WO2018122943A1 PCT/JP2016/088831 JP2016088831W WO2018122943A1 WO 2018122943 A1 WO2018122943 A1 WO 2018122943A1 JP 2016088831 W JP2016088831 W JP 2016088831W WO 2018122943 A1 WO2018122943 A1 WO 2018122943A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
opening
indoor
heat exchanger
expansion device
Prior art date
Application number
PCT/JP2016/088831
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English (en)
Japanese (ja)
Inventor
要平 馬場
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.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2018558549A priority Critical patent/JP6785880B2/ja
Priority to PCT/JP2016/088831 priority patent/WO2018122943A1/fr
Publication of WO2018122943A1 publication Critical patent/WO2018122943A1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle

Definitions

  • the present invention relates to an air conditioner that suppresses sound generated by a check valve.
  • conditioned air is generated by circulating a refrigerant that conveys heat to a pipe provided between an outdoor unit and an indoor unit.
  • a relay unit that distributes the refrigerant to each indoor unit is installed between the outdoor unit and the indoor unit.
  • a check valve is provided in parallel in the repeater, and the flow of the refrigerant during cooling operation and heating operation is controlled by the check valve.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an air conditioner that can suppress sound generated by a check valve.
  • An air conditioner includes a compressor, a flow path switching device, an outdoor unit having an outdoor heat exchanger, a plurality of indoor units having an indoor heat exchanger and an indoor expansion device, the outdoor unit, and the A relay that is provided between the indoor unit and controls the flow of the refrigerant flowing into the indoor unit according to the operating state of the indoor unit, and each of the indoor units selects a cooling operation or a heating operation.
  • An air conditioner capable of performing simultaneous cooling and heating wherein the relay is connected to the outdoor unit via a first refrigerant pipe and a second refrigerant pipe, and the indoor heat in the indoor unit is A first branch part having an on-off valve for selectively connecting one of the refrigerant inlets and outlets of the exchanger to the second refrigerant pipe via the first refrigerant pipe or a gas-liquid separator;
  • the other refrigerant inlet / outlet of the indoor heat exchanger in the knit is the refrigerant inlet
  • the refrigerant is connected to the gas / liquid separator via the first expansion device, and the other refrigerant inlet / outlet of the indoor heat exchanger in the indoor unit is the refrigerant.
  • a second branch part having a check valve connected to the outlet side of the first throttle device when it becomes an outlet, and an initial time when the pressure difference between the front and the rear of the first throttle device becomes greater than a reference value when the compressor is started And a controller for setting the opening as the opening of the first throttle device.
  • the opening degree of the first throttle device is set to the initial opening degree at which the pressure difference before and after the first throttle device is greater than or equal to the reference value.
  • FIG. 1 is a diagram illustrating a configuration of an air-conditioning apparatus 100 according to an embodiment of the present invention.
  • an air conditioner 100 according to the present embodiment includes an outdoor unit 51, a plurality of indoor units 52a and 52b, a relay unit 53 between the outdoor unit 51 and the indoor units 52a and 52b, Is provided.
  • the outdoor unit 51 and the repeater 53 are connected by a first gas pipe 103 and a first liquid pipe 104 through which the refrigerant flows.
  • the relay 53 and the indoor unit 52a are connected by a second liquid pipe 105a and a second gas pipe 106a, and the relay 53 and the indoor unit 52b are connected by a second liquid pipe 105b and a second gas pipe 106b. Connected by.
  • the first gas pipe 103 is an example of the “first refrigerant pipe” in the present invention
  • the first liquid pipe 104 is an example of the “second refrigerant pipe” in the present invention.
  • the air conditioner 100 is, for example, the air conditioner 100 in which the indoor units 52a and 52b can independently perform a cooling operation or a heating operation.
  • the air conditioner 100 includes a cooling operation in which both of the indoor units 52a and 52b perform a cooling operation, a heating operation in which both of the indoor units 52a and 52b perform a heating operation, and one of the indoor units 52a and 52b. Performs the cooling operation, the other performs the heating operation, and the simultaneous cooling and heating operation in which the cooling operation and the heating operation are mixed can be performed.
  • the outdoor unit 51 includes a compressor 1, a flow path switching device 3, an outdoor heat exchanger 2, an accumulator 4, and a refrigerant flow control unit 54.
  • the compressor 1 draws in refrigerant, compresses it, and discharges it.
  • a first pressure sensor 31 that detects the pressure Pd is provided on the discharge side of the compressor 1, and a second pressure sensor 32 that detects the pressure Ps is provided on the suction side of the compressor 1.
  • the pressures Pd and Ps detected by the first pressure sensor 31 and the second pressure sensor 32 are sent to the outdoor controller 201.
  • the outdoor controller 201 functions as a controller that controls the entire air conditioner 100.
  • the outdoor heat exchanger 2 circulates a refrigerant inside, and performs heat exchange between the refrigerant and outdoor air.
  • the outdoor heat exchanger 2 functions as an evaporator during heating operation, and evaporates and vaporizes the refrigerant. Further, during cooling operation, it functions as a condenser and condenses and liquefies the refrigerant.
  • the flow path switching device 3 switches the flow of refrigerant such as a four-way valve, for example, and the operation content such as cooling operation or heating operation is changed by switching the flow path switching device 3.
  • the accumulator 4 stores the surplus liquid refrigerant.
  • the refrigerant flow control unit 54 allows the refrigerant flow direction in only one direction.
  • the refrigerant flow control unit 54 includes connection pipes 130, 131, 132, 133 that connect the connection portions a, b, c, and d, and check valves 7a, 7b, 7c that allow the refrigerant flow in one direction. 7d.
  • the refrigerant flow control unit 54 is a part of the components of the outdoor unit 51.
  • the connection pipe 130 connects the connection part c and the connection part a
  • the connection pipe 131 connects the connection part d and the connection part b
  • the connection pipe 132 connects the connection part c and the connection part d.
  • the connection pipe 133 connects the connection part a and the connection part b.
  • the first gas pipe 103 connected to the relay 53 and the high-pressure pipe 102 connected to the compressor 1 are connected by the connection pipe 132, and the low-pressure pipe 101 connected to the compressor 1 by the connection pipe 133, and The 1st liquid piping 104 connected with the repeater 53 is connected.
  • the check valve 7a is arranged in the connection pipe 132 and allows the refrigerant flow in the direction from the connection part c to the connection part d.
  • the check valve 7b is arranged in the connection pipe 133 and allows the refrigerant flow in the direction from the connection part a to the connection part b.
  • the check valve 7c is arranged in the connection pipe 131 and allows the refrigerant flow in the direction from the connection part d to the connection part b.
  • the check valve 7d is arranged in the connection pipe 130 and allows the refrigerant flow in the direction from the connection part c to the connection part a.
  • the indoor units 52a and 52b include indoor heat exchangers 5a and 5b and indoor expansion devices 6a and 6b. Each component of the indoor units 52a and 52b is controlled by the indoor controllers 202a and 202b.
  • the indoor heat exchangers 5a and 5b allow the refrigerant that has passed through the relay 53 to flow inside, and exchange heat between the refrigerant and air to be air-conditioned.
  • the indoor heat exchangers 5a and 5b function as a condenser during heating operation, and condense and liquefy the refrigerant.
  • the second liquid pipes 105a and 105b connected to the indoor throttle devices 6a and 6b are respectively connected to the relay trident section 55b via the relay trident section 55a and the relay second liquid pipe 113. Yes.
  • the indoor heat exchangers 5a and 5b function as an evaporator during the cooling operation, and evaporate and evaporate the refrigerant.
  • the indoor expansion devices 6a and 6b function as pressure reducing valves or expansion valves, and expand the refrigerant by reducing the pressure.
  • the indoor expansion devices 6a and 6b only need to be able to adjust the pressure of the refrigerant according to the air conditioning load.
  • flow control means such as an electronic expansion valve can be used.
  • first temperature sensors 33a and 33b and second temperature sensors 34a and 34b are arranged.
  • the first temperature sensors 33a and 33b and the second temperature sensors 34a and 34b detect the temperature of the refrigerant flowing into and out of the indoor heat exchangers 5a and 5b, and send the detected signals to the indoor controllers 202a and 202b. It is.
  • the relay 53 includes the gas-liquid separator 8, the first branching unit 20, the first throttle device 11, the second throttle device 12, the first heat exchanger 13, the second heat exchanger 14, and the second branching unit 21. And controls the flow of the refrigerant flowing into the indoor units 52a and 52b according to the operating state of the indoor units 52a and 52b. And the repeater 53 controls the flow of the refrigerant
  • Each component of the repeater 53 is controlled by the repeater controller 203, and each component includes a bypass pipe 110, a repeater first liquid pipe 111, a repeater gas pipe 112, and a repeater second liquid pipe 113. Connected by.
  • the repeater 53 is connected to the outdoor unit 51 by the first gas pipe 103 and the first liquid pipe 104.
  • the repeater 53 is connected to each of the indoor units 52a and 52b by second liquid pipes 105a and 105b and second gas pipes 106a and 106b.
  • the gas-liquid separator 8 separates the refrigerant into a liquid refrigerant and a gas refrigerant, and is connected to the first liquid pipe 104, the relay first liquid pipe 111, and the relay gas pipe 112.
  • the first liquid pipe 104 connects the outdoor unit 51 and the gas-liquid separator 8
  • the relay first liquid pipe 111 connects the gas-liquid separator 8 and the relay trifurcation 55 b
  • the relay gas pipe 112 connects the gas-liquid separator 8 and each of the first on-off valves 9a and 9b of the first branch portion 20.
  • the first branch section 20 selectively connects one of the refrigerant inlets and outlets of the indoor heat exchangers 5a and 5b in the indoor units 52a and 52b to the first liquid pipe 104 via the first gas pipe 103 or the gas-liquid separator 8.
  • the first on-off valves 9a and 9b and the second on-off valves 10a and 10b are configured.
  • the second branch portion 21 is connected to the gas-liquid separator 8 via the first expansion device 11 when the other refrigerant inlet / outlet of the indoor heat exchangers 5a, 5b in the indoor units 52a, 52b is the refrigerant inlet, First check valves 15a, 15b and second check valves connected to the outlet side of the first expansion device 11 when the other refrigerant inlet / outlet of the indoor heat exchangers 5a, 5b in the indoor units 52a, 52b is the refrigerant outlet. It consists of valves 16a and 16b.
  • Second gas pipes 106a and 106b are branched and connected to the first on-off valves 9a and 9b and the second on-off valves 10a and 10b, respectively.
  • the first on-off valves 9a and 9b are used to shut off or allow the gas refrigerant flowing into the indoor units 52a and 52b from the relay gas pipe 112 to pass or flow out from the relay 53 by opening and closing.
  • the first on-off valves 9a and 9b are opened when the indoor units 52a and 52b connected via the second gas pipes 106a and 106b are performing the heating operation.
  • the second on-off valves 10a and 10b are used to block the gas refrigerant flowing into the relay 53 from the second gas pipes 106a and 106b of the indoor units 52a and 52b or to pass the refrigerant in the direction of flowing into the relay 53. is there.
  • the second on-off valves 10a and 10b are opened when the indoor units 52a and 52b connected via the second gas pipes 106a and 106b are performing the cooling operation.
  • the first check valve 15a allows the refrigerant flow in the direction from the connection part g to the connection part f.
  • the first check valve 15b allows the refrigerant flow in the direction from the connection part g to the connection part h.
  • the second check valve 16a allows the refrigerant flow in the direction from the connection part f to the connection part e.
  • the second check valve 16b allows the refrigerant flow in the direction from the connection portion h to the connection portion e.
  • 1st heat exchanger 13 distribute
  • the first expansion device 11 depressurizes the liquid refrigerant that has passed through the first heat exchanger 13 and flows it into the second heat exchanger 14.
  • the 2nd heat exchanger 14 distribute
  • the first heat exchanger 13, the first expansion device 11, and the second heat exchanger 14 are interposed between the gas-liquid separator 8 and the relay trident portion 55 a and are connected by the relay first liquid pipe 111.
  • the bypass pipe 110 connects the relay trident section 55a and the first gas pipe 103 while passing through the second expansion device 12, the second heat exchanger 14, and the first heat exchanger 13, and the liquid refrigerant. Is recovered and returned to the outdoor unit 51.
  • a flow rate control unit capable of precise control of the flow rate by changing the opening degree, such as an electronic expansion valve, may be used.
  • 3rd pressure sensor 35 is installed between the 1st heat exchanger 13 and the 1st expansion device 11, and detects pressure P35 between them.
  • the 4th pressure sensor 36 is installed between the 1st expansion device 11 and the 2nd heat exchanger 14, and detects the pressure P36 between them.
  • the pressures P35 and P36 detected by the third pressure sensor 35 and the fourth pressure sensor 36 are sent to the repeater controller 203, respectively.
  • the air conditioner 100 can perform a cooling only operation, a heating only operation, and a cooling / heating simultaneous operation.
  • the simultaneous cooling and heating operation can be performed in two operation modes: a heating main operation when the heating load is high, and a cooling main operation when the cooling load is high. Therefore, the air conditioning apparatus 100 can be operated in four different operation modes.
  • FIG. 2 is a diagram showing a refrigerant flow in the refrigerant circuit during the cooling only operation of the air-conditioning apparatus 100 according to the embodiment of the present invention. 2 indicate the direction of the refrigerant, and the same applies to FIGS. 3 to 5 described later.
  • the operation at the time of the cooling operation in which both of the indoor units 52a and 52b perform the cooling operation will be described. During the all-cooling operation, both the indoor units 52a and 52b perform the cooling operation, the first on-off valves 9a and 9b of the relay 53 are closed, and the second on-off valves 10a and 10b are opened.
  • the refrigerant is compressed in the compressor 1, discharged as a high-temperature and high-pressure gas refrigerant, and flows into the outdoor heat exchanger 2 from the flow path switching device 3.
  • the refrigerant that has flowed into the outdoor heat exchanger 2 is condensed and liquefied by heat exchange with outdoor air in the outdoor heat exchanger 2 and flows out from the low-pressure pipe 101 to the refrigerant flow control unit 54.
  • the refrigerant that has flowed into the refrigerant flow control unit 54 passes through the check valve 7b of the connection pipe 133 without flowing into the connection pipe 130 by the check valve 7d in the refrigerant flow control unit 54, and passes through the check valve 7b from the refrigerant flow control unit 54. It flows out and flows into the repeater 53 from the outdoor unit 51.
  • the refrigerant flowing into the relay unit 53 is separated into a liquid refrigerant and a gas refrigerant in the gas-liquid separator 8.
  • all of the refrigerant is liquid refrigerant, and all of the refrigerant flows into the relay first liquid pipe 111 and therefore does not flow into the relay gas pipe 112.
  • the refrigerant flowing into the relay first liquid pipe 111 is increased in supercooling degree in the first heat exchanger 13 while being circulated through the relay first liquid pipe 111, and is reduced to an intermediate pressure in the first expansion device 11.
  • the degree of supercooling is further increased and reaches the relay trifurcation 55a.
  • the refrigerant that has reached the relay trifurcation 55a is diverted at the relay trifurcation 55a, part of it flows into the bypass pipe 110, and the rest passes through the first check valves 15a and 15b and flows out of the relay 53. .
  • the refrigerant flowing into the bypass pipe 110 is depressurized to a low pressure in the second expansion device 12, flows in the order of the second heat exchanger 14 and the first heat exchanger 13, evaporates by heat exchange, and becomes a gas refrigerant. Merges into one gas pipe 103. At this time, the refrigerant in the bypass pipe 110 increases the degree of supercooling of the refrigerant flowing through the relay first liquid pipe 111 by heat exchange.
  • the refrigerant that is diverted at the relay trifurcation 55b and flows out of the relay 53 flows through the second liquid pipes 105a and 105b and flows into the indoor units 52a and 52b, respectively.
  • the refrigerant flowing into each of the indoor units 52a and 52b is decompressed in the indoor expansion devices 6a and 6b of the indoor units 52a and 52b, and then exchanges heat with the air in the air-conditioning target space in the indoor heat exchangers 5a and 5b.
  • the air in the air-conditioned space is cooled and evaporated to gasify. Thereby, cooling of the air-conditioning target space is realized.
  • the gasified refrigerant passes through the indoor heat exchangers 5a and 5b, flows through the second gas pipes 106a and 106b, flows out from the indoor units 52a and 52b, flows into the relay 53 again, and is opened in the second state. It passes through the on-off valves 10a and 10b.
  • the refrigerant that has passed through the second on-off valves 10 a and 10 b merges with the refrigerant that has passed through the bypass pipe 110 in the first gas pipe 103, flows out of the relay unit 53, and flows into the outdoor unit 51.
  • the refrigerant flowing into the outdoor unit 51 passes through the check valve 7 a disposed in the connection pipe 132 of the refrigerant flow control unit 54 in the outdoor unit 51, and is sucked into the compressor 1 through the accumulator 4. Thereby, the refrigerant circuit is circulated by the refrigerant.
  • FIG. 3 is a diagram showing a refrigerant flow in the refrigerant circuit during the heating only operation of the air-conditioning apparatus 100 according to the embodiment of the present invention.
  • movement at the time of all the heating operation which performs heating operation of both indoor unit 52a, 52b is demonstrated.
  • both the indoor units 52a and 52b perform the heating operation, the first on-off valves 9a and 9b of the relay 53 are opened, and the second on-off valves 10a and 10b are closed. As shown in FIG.
  • the refrigerant is compressed in the compressor 1 and discharged as a high-temperature and high-pressure gas refrigerant, flows into the refrigerant flow control unit 54 from the flow path switching device 3, and reaches the connection portion d. .
  • the refrigerant that has reached the connection part d cannot flow through the connection pipe 132 from the connection part d by the check valve 7a, flows into the connection pipe 131, passes through the check valve 7c, and passes through the connection part b. It flows out of 51.
  • the refrigerant that has flowed out of the outdoor unit 51 flows through the first liquid pipe 104 and flows into the repeater 53.
  • the refrigerant flowing into the relay unit 53 is separated into a gas refrigerant and a liquid refrigerant in the gas-liquid separator 8.
  • all the refrigerant is a gas refrigerant, and all of the refrigerant flows into the relay gas pipe 112, and thus does not flow into the relay first liquid pipe 111.
  • the refrigerant that has flowed into the relay gas pipe 112 reaches the first on-off valves 9a and 9b, passes through the opened first on-off valves 9a and 9b, and flows out of the relay 53.
  • the refrigerant flowing out of the relay unit 53 flows into the indoor units 52a and 52b, exchanges heat with the air in the air-conditioning target space in the indoor heat exchangers 5a and 5b, and condenses while radiating heat to the air in the air-conditioning target space. Liquefaction. Thereby, the air-conditioning target space is heated.
  • the liquefied refrigerant passes through the indoor heat exchangers 5a and 5b, is reduced in pressure in the indoor expansion devices 6a and 6b, becomes an intermediate-pressure liquid refrigerant, and flows out of the indoor units 52a and 52b.
  • the refrigerant that has flowed out of the indoor units 52a and 52b flows through the second liquid pipes 105a and 105b and flows into the relay 53, and passes through the second check valves 16a and 16b and the relay trifurcation 55a from the bypass pipe 110. It merges into the 1 gas pipe 103 and flows out from the repeater 53.
  • the refrigerant that has flowed out of the relay 53 passes through the first gas pipe 103 and reaches the connection portion c of the refrigerant flow control unit 54.
  • the refrigerant that has reached the connection portion c cannot flow through the high-pressure connection pipe 132 in the connection portion c, passes through the check valve 7d of the connection pipe 130, and flows through the low-pressure pipe 101.
  • the refrigerant flowing through the low-pressure pipe 101 evaporates by heat exchange with outdoor air while passing through the outdoor heat exchanger 2 from the low-pressure pipe 101 and is sucked into the compressor 1 through the flow path switching device 3 and the accumulator 4. The Thereby, the refrigerant circuit is circulated by the refrigerant.
  • FIG. 4 is a diagram illustrating a refrigerant flow in the refrigerant circuit during the cooling main operation of the air-conditioning apparatus 100 according to the embodiment of the present invention.
  • the simultaneous cooling / heating operation in which the indoor unit 52a performs the heating operation and the indoor unit 52b performs the cooling operation will be described.
  • the first on-off valve 9a and the second on-off valve 10b of the repeater 53 are open, and the first on-off valve 9b and the second on-off valve 10a are closed.
  • the flow of the refrigerant when the cooling main operation is performed in which the cooling load is higher than the heating load will be described.
  • the refrigerant is compressed by the compressor 1, condensed and liquefied by exchanging heat in the outdoor heat exchanger 2, and flows out as a gas-liquid two-phase refrigerant.
  • the amount of refrigerant condensed and liquefied in the outdoor heat exchanger 2, that is, the ratio of gas refrigerant and liquid refrigerant, is determined according to the ratio of cooling load and heating load.
  • the refrigerant that has flowed out of the outdoor heat exchanger 2 flows through the low-pressure pipe 101, passes through the check valve 7 b of the refrigerant flow control unit 54, flows out of the outdoor unit 51, flows through the first liquid pipe 104, and is relayed 53.
  • the refrigerant that has flowed into the relay 53 is separated into liquid refrigerant and gas refrigerant in the gas-liquid separator 8, of which liquid refrigerant flows into the relay first liquid pipe 111, and gas refrigerant flows into the relay gas pipe 112. To do.
  • the liquid refrigerant flowing into the relay first liquid pipe 111 passes through the first heat exchanger 13, the first expansion device 11, and the second heat exchanger 14, so that the degree of supercooling is increased and the relay trident section Reach 55a.
  • a part of the refrigerant that has reached the relay trifurcation 55a flows through the bypass pipe 110, and the rest flows through the first check valves 15a and 15b so as to flow out of the relay 53.
  • the refrigerant flowing into the bypass pipe 110 from the relay trifurcation 55a absorbs heat by heat exchange and evaporates while passing through the second expansion device 12, the second heat exchanger 14, and the first heat exchanger 13. It vaporizes and reaches the first gas pipe 103.
  • the gas refrigerant that has flowed into the relay gas pipe 112 reaches the first on-off valves 9a and 9b, passes through the first on-off valve 9a in the open state, flows out of the relay 53, and flows into the second gas pipe 106a. Flows into the indoor unit 52a.
  • the refrigerant passes through the indoor heat exchanger 5a of the indoor unit 52a and condenses and liquefies while dissipating heat to the air in the air-conditioning target space by heat exchange. Thereby, the air-conditioning target space is heated.
  • the refrigerant that has passed through the indoor heat exchanger 5a is reduced in pressure by the indoor expansion device 6a to become an intermediate-pressure liquid refrigerant, flows out of the indoor unit 52a, passes through the second liquid pipe 105a, and reaches the relay trifurcation 55b. To do.
  • the refrigerant flowing through the second liquid pipe 105a connected to the indoor unit 52a and the refrigerant passing through the first expansion device 11 merge and flow through the second heat exchanger 14.
  • a part of the refrigerant that has circulated through the second heat exchanger 14 circulates through the bypass pipe 110, and the other part of the refrigerant passes through the first check valve 15 b and flows out from the relay 53.
  • the refrigerant that has flowed out of the relay unit 53 is depressurized in the indoor expansion device 6b in the indoor unit 52b from the second liquid pipe 105b, and flows into the indoor heat exchanger 5b.
  • the refrigerant flowing into the indoor heat exchanger 5b evaporates and gasifies by heat exchange with the air in the air-conditioning target space in the indoor heat exchanger 5b, and flows out as a gas refrigerant. Thereby, the air-conditioning target space is cooled.
  • the refrigerant that has passed through the indoor heat exchanger 5b passes through the opened second on-off valve 10b.
  • the refrigerant that has passed through the second on-off valve 10b merges with the refrigerant that has passed through the bypass pipe 110 that also reaches the first gas pipe 103, flows out of the repeater 53 through the first gas pipe 103, and the outdoor unit 51. Flow into.
  • the refrigerant flowing into the outdoor unit 51 passes through the check valve 7a provided in the connection pipe 132 in the refrigerant flow control unit 54 of the outdoor unit 51, and passes from the flow path switching device 3 to the compressor 1 via the accumulator 4. Inhaled. Thereby, the refrigerant circuit is circulated by the refrigerant.
  • FIG. 5 is a diagram showing a refrigerant flow in the refrigerant circuit during the heating main operation of the air-conditioning apparatus 100 according to the embodiment of the present invention.
  • the refrigerant is compressed and discharged by the compressor 1, passes through the flow path switching device 3, and reaches the connection portion d of the refrigerant flow control unit 54.
  • the refrigerant that has reached the connection portion d passes through the check valve 7 c provided in the connection pipe 131, flows out of the outdoor unit 51 through the first liquid pipe 104, and flows into the repeater 53.
  • the refrigerant that has flowed into the relay 53 flows from the gas-liquid separator 8 into the relay gas pipe 112. At this time, since the heating main operation is performed, there is no liquid refrigerant separated in the gas-liquid separator 8, and no refrigerant flows into the relay first liquid pipe 111.
  • the refrigerant that has flowed into the relay gas pipe 112 reaches the first on-off valves 9a and 9b, passes through the opened first on-off valve 9a, flows out of the relay 53, and passes through the second gas pipe 106a. It flows into the unit 52a.
  • the refrigerant flowing into the indoor unit 52a passes through the indoor heat exchanger 5a of the indoor unit 52a, condenses and liquefies while dissipating heat to the air in the air-conditioning target space by heat exchange. Thereby, the air-conditioning target space is heated.
  • the refrigerant that has passed through the indoor heat exchanger 5a is depressurized by the indoor expansion device 6a to be an intermediate-pressure liquid refrigerant, flows into the second liquid pipe 105a from the indoor unit 52a, and flows into the relay 53.
  • the refrigerant flowing into the relay 53 passes through the second check valve 16a, the relay second liquid pipe 113, and the second heat exchanger 14, and reaches the relay trifurcation 55a.
  • a part of the refrigerant that has reached the relay trifurcation 55 a flows through the bypass pipe 110, and the remaining refrigerant flows through the first check valve 15 b and flows out from the relay 53.
  • the refrigerant that has flowed out of the relay unit 53 is depressurized in the indoor expansion device 6b in the indoor unit 52b from the second liquid pipe 105b, and flows into the indoor heat exchanger 5b.
  • the refrigerant flowing into the indoor heat exchanger 5b evaporates and gasifies by heat exchange with the air in the air-conditioning target space in the indoor heat exchanger 5b, and flows out as a gas refrigerant. Thereby, the air-conditioning target space is cooled.
  • the refrigerant that has passed through the indoor heat exchanger 5b passes through the opened second on-off valve 10b.
  • the refrigerant that has passed through the second on-off valve 10b merges with the refrigerant that has passed through the bypass pipe 110 that also reaches the first gas pipe 103, flows out of the repeater 53 through the first gas pipe 103, and the outdoor unit 51. Flow into.
  • the refrigerant flow control unit 54 of the outdoor unit 51 the refrigerant that has flowed into the outdoor unit 51 passes through the check valve 7 d disposed in the connection pipe 130 and flows into the outdoor heat exchanger 2 from the low-pressure pipe 101.
  • the refrigerant flowing into the outdoor heat exchanger 2 is evaporated and gasified by heat exchange in the outdoor heat exchanger 2, and is sucked into the compressor 1 through the flow path switching device 3 and the accumulator 4. Thereby, the refrigerant circuit is circulated by the refrigerant.
  • the first throttle device 11 of the relay 53 is opened in order to improve the rise by flowing hot gas into the relay 53 when the compressor 1 is started. Further, during the simultaneous cooling and heating operation, the first throttle is set so that the pressure difference ⁇ P between the pressure P35 and the pressure P36, which is the pressure difference between the first throttle device 11 in the repeater 53, becomes a preset value. The opening degree LEV11 of the device 11 is adjusted.
  • the pressure difference ⁇ P before and after the first expansion device 11 decreases.
  • the pressures of the connection parts f and h are close to the pressure of the third pressure sensor 35, and the connection parts e and g are close to the pressure of the fourth pressure sensor 36. Therefore, when the opening degree LEV11 of the first expansion device 11 increases, the pressure difference ⁇ Pa before and after the first check valves 15a and 15b and the second check valves 16a and 16b decreases.
  • first check valves 15a and 15b and the second check valves 16a and 16b are lifted when the pressure difference ⁇ Pa between them becomes equal to or greater than the reference value B, and the refrigerant flows, and is less than the reference value B.
  • the valve body is lowered by its own weight.
  • the reference value B a guaranteed value by the manufacturer or a specific value obtained in advance by a test is used.
  • the pressure difference ⁇ Pa approaches the reference value B, the valve body is repeatedly lifted or lowered, and the sound of the valve body colliding with the valve seat is continuously generated. Therefore, in the present embodiment, vibration noise of the first check valves 15a and 15b and the second check valves 16a and 16b is suppressed.
  • FIG. 6 is a functional block diagram of the air conditioning apparatus 100 according to the embodiment of the present invention.
  • the outdoor controller 201 is electrically connected to each of the indoor controllers 202 a and 202 b and the repeater controller 203.
  • the outdoor controller 201 has a function as a main controller that controls the air conditioner 100.
  • the outdoor controller 201 has a timer (not shown) for measuring time.
  • the outdoor controller 201 determines an instruction for each of the indoor controllers 202a and 202b and the repeater controller 203 based on information notified from the indoor controllers 202a and 202b and the repeater controller 203. And notify.
  • the outdoor controller 201 acquires the pressures Pd and Ps detected by the first pressure sensor 31 and the second pressure sensor 32 provided in the outdoor unit 51, and the operating frequency Fa of the compressor 1 and the capacity of the outdoor heat exchanger 2. Control AKa.
  • the indoor controllers 202a and 202b detect the temperatures T33a and T33b and T34a and T34b with the first temperature sensors 33a and 33b and the second temperature sensors 34a and 34b, and notify the outdoor controller 201 of them. Further, based on the temperatures T33a, T33b and T34a, T34b, the respective openings LEV6a, LEV6b of the indoor expansion devices 6a, 6b are calculated and notified to the indoor expansion devices 6a, 6b.
  • the repeater controller 203 In response to an instruction from the outdoor controller 201, the repeater controller 203 notifies the first throttle device 11 and the second throttle device 12 of the openings LEV11 and LEV12, and the first on-off valves 9a, 9b and second The on / off valves 10a and 10b are instructed to open and close. Further, P35 and P36 detected by the third pressure sensor 35 and the fourth pressure sensor 36 are acquired, the opening degree LEV11 and LEV12 are instructed to the first expansion device 11 and the second expansion device 12, and the outdoor controller 201 is obtained. To notify. *
  • FIG. 7 is a first flowchart showing a process for determining the opening degree LEV6a of the indoor expansion device 6a of the indoor unit 52a according to the embodiment of the present invention.
  • FIG. 7 shows processing when the indoor unit 52a is in the cooling operation.
  • the opening degree LEV6a of the indoor expansion device 6a is controlled by a controller that controls the entire air conditioner 100, and is controlled by the outdoor controller 201 in this example.
  • the outdoor controller 201 acquires the opening degree LEV6 when the opening degree LEV6a of the indoor expansion device 6a starts and measures the timer t. Start.
  • step S1A the outdoor controller 201 determines whether or not the reference time tm0 has elapsed. If the outdoor controller 201 determines that the reference time tm0 has elapsed (Yes in step S1A), the outdoor controller 201 proceeds to step S2A and sets the timer t. Reset to zero and move to step S3A.
  • step S3A the outdoor controller 201 acquires the temperature T33a and the temperature T34a detected by the first temperature sensor 33a and the second temperature sensor 34a.
  • the temperature T33a and the temperature T34a represent the refrigerant saturation temperature and the refrigerant temperature, respectively.
  • step S4A the indoor controller 202a calculates a temperature difference SH between the temperature T34a and the temperature T33a.
  • step S5A the outdoor controller 201 calculates a difference ⁇ SH between the temperature difference SH and a preset target value temperature difference SHm.
  • step S6A the indoor controller 202a calculates a correction value ⁇ LEV6a of the opening degree LEV6a of the indoor expansion device 6a.
  • the correction value ⁇ LEV6a may be obtained by, for example, calculating the coefficient k1 in advance by a test or the like and multiplying the coefficient k1 and the temperature difference ⁇ SH.
  • step S7A the outdoor controller 201 sets the opening degree obtained by adding the correction value ⁇ LEV6a to the current opening degree LEV6a of the indoor expansion device 6a as the new opening degree LEV6a of the indoor expansion device 6a.
  • step S8A the outdoor controller 201 determines whether or not the reference time tm1 has elapsed. If it is determined that the reference time tm1 has elapsed (Yes in step S8A), the outdoor controller 201 ends the process. For example, the indoor throttling device 6a may be fully closed.
  • step S8A when the outdoor controller 201 determines that the reference time tm1 has not elapsed (No in step S8A), the process returns to step S1A, and the processing from step S1A to step S8A is repeated for each reference time.
  • FIG. 8 is a second flowchart showing a process for determining the opening degree LEV6a of the indoor expansion device 6a of the indoor unit 52a according to the embodiment of the present invention.
  • FIG. 8 has shown the process at the time of the indoor unit 52a heating operation.
  • the opening degree LEV6a of the indoor expansion device 6a is controlled by a controller that controls the entire air conditioner 100, and is controlled by the outdoor controller 201 in this example.
  • the outdoor controller 201 acquires the opening degree LEV6 at the start of the opening degree LEV6a of the indoor expansion device 6a and measures the timer t. Start.
  • step S1B the outdoor controller 201 determines whether or not the reference time tm0 has elapsed. If it is determined that the reference time tm0 has elapsed (Yes in step S1B), the outdoor controller 201 proceeds to step S2B and sets the timer t. After resetting to zero, the process proceeds to step S3B.
  • step S3B the outdoor controller 201 acquires the temperature T33a and the pressure P31 detected by the first temperature sensor 33a and the first pressure sensor 31 (step S3B1), and calculates the saturation temperature Tc31 from the pressure P31 (step S3B2). ).
  • step S4B the indoor controller 202a calculates a temperature difference SC between the temperature T33a and the saturation temperature Tc31.
  • step S5B the outdoor controller 201 calculates a difference ⁇ SC between the temperature difference SC and a preset target value temperature difference SCm.
  • step S6B the indoor controller 202a calculates a correction value ⁇ LEV6a of the opening degree LEV6a of the indoor expansion device 6a.
  • the correction value ⁇ LEV6a may be obtained by, for example, calculating the coefficient k2 in advance by a test or the like and multiplying the coefficient k2 and the temperature difference ⁇ SC.
  • step S7B the outdoor controller 201 sets the opening degree obtained by adding the correction value ⁇ LEV6a to the current opening degree LEV6a of the indoor expansion device 6a as the new opening degree LEV6a of the indoor expansion device 6a.
  • step S8B the outdoor controller 201 determines whether or not the reference time tm1 has elapsed. If it is determined that the reference time tm1 has elapsed (Yes in step S8B), the outdoor controller 201 ends the process. For example, the indoor throttling device 6a may be fully closed.
  • step S8B determines that the reference time tm1 has not elapsed (No in step S8B)
  • the process returns to step S1B, and the processing from step S1B to step S8B is repeated for each reference time.
  • the processing for determining the opening degree LEV6a of the indoor expansion device 6a of the indoor unit 52a has been described above. However, the determination of the opening degree LEV6b of the indoor expansion device 6b of the indoor unit 52b is performed by the same processing.
  • FIG. 9 is a flowchart of control for suppressing vibration noise of the first check valves 15a and 15b and the second check valves 16a and 16b performed by the outdoor controller 201 and the repeater controller 203 according to the embodiment of the present invention. It is.
  • FIG. 9 shows a process immediately after the compressor 1 is started during the all-heating operation or the simultaneous cooling / heating operation of the air-conditioning apparatus 100.
  • the opening degree LEV6a and LEV6b of the indoor expansion devices 6a and 6b are determined by the above-described processing.
  • the outdoor controller 201 starts measuring the timer t.
  • step S12 the repeater controller 203 sets the opening degree LEV11 of the first throttle device 11 to a preset initial opening degree LEV11ini.
  • the initial opening degree LEV11ini is an opening degree at which the pressure difference ⁇ P between the pressures P35 and P36 is equal to or greater than the reference value A, and is obtained in advance by a test or the like.
  • step S13 the outdoor controller 201 determines whether or not the reference time tm2 has elapsed. If it is determined that the reference time tm2 has elapsed (Yes in step S13), the outdoor controller 201 resets the timer t in step S14, The process proceeds to step S15.
  • step S15 the repeater controller 203 determines whether or not the pressure difference ⁇ P between the pressure P35 detected by the third pressure sensor 35 and the pressure P36 detected by the fourth pressure sensor 36 is less than the reference value A. to decide.
  • the process proceeds to step S16.
  • the repeater controller 203 determines that the pressure difference ⁇ P is greater than or equal to the reference value A (No in step S15)
  • the process proceeds to step S25.
  • step S ⁇ b> 16 the repeater controller 203 obtains an opening obtained by adding a preset first correction value ⁇ LEV11 to the current opening LEV ⁇ b> 11 of the first expansion device 11, and the new opening of the first expansion device 11. It sets as LEV11 and transfers to step S17.
  • the first correction value ⁇ LEV11 is a negative value, and is a value in the direction in which the first diaphragm device 11 is closed.
  • the pressure difference (DELTA) P before and behind the 1st expansion device 11 increases by reducing the opening degree of the 1st expansion device 11.
  • the first correction value ⁇ LEV11 is determined in advance by a test or the like.
  • step S17 the repeater controller 203 determines whether or not the pressure difference ⁇ P between the pressure P35 detected by the third pressure sensor 35 and the pressure P36 detected by the fourth pressure sensor 36 is less than the reference value A. to decide.
  • the process proceeds to step S18.
  • the repeater controller 203 determines that the pressure difference ⁇ P is greater than or equal to the reference value A (No in step S17)
  • the process proceeds to step S25.
  • step S18 the repeater controller 203 determines whether or not the current opening degree LEV11 of the first throttle device 11 is the minimum opening degree LEV11min. If the repeater controller 203 determines that the current opening degree LEV11 of the first throttle device 11 is the minimum opening degree LEV11min (Yes in step S18), the process proceeds to step S19. On the other hand, if the repeater controller 203 determines that the current opening degree LEV11 of the first throttle device 11 is not the minimum opening degree LEV11min (No in step S18), the process returns to step S16.
  • step S19 the repeater controller 203 sets the opening obtained by adding the preset second correction value ⁇ LEV12 to the current opening LEV12 of the second expansion device 12 as a new opening LEV12 of the second expansion device 12.
  • the second correction value ⁇ LEV12 is a positive value and is a value in the direction in which the second diaphragm device 12 opens. Then, by increasing the opening degree of the second expansion device 12, the pressure P36 of the fourth pressure sensor 36 decreases, and the pressure difference ⁇ P between P35 and P36 increases.
  • the value of the second correction value ⁇ LEV12 is determined in advance by a test or the like.
  • step S20 the repeater controller 203 determines whether or not the pressure difference ⁇ P between the pressure P35 detected by the third pressure sensor 35 and the pressure P36 detected by the fourth pressure sensor 36 is less than the reference value A. to decide.
  • the process proceeds to step S21.
  • the repeater controller 203 determines that the pressure difference ⁇ P is greater than or equal to the reference value A (No in step S20)
  • the process proceeds to step S25.
  • step S21 the repeater controller 203 determines whether or not the current opening degree LEV12 of the second expansion device 12 is the maximum opening degree LEV12max.
  • the process proceeds to step S22.
  • the repeater controller 203 determines that the current opening degree LEV12 of the second expansion device 12 is not the maximum opening degree LEV12max (No in step S21)
  • the process returns to step S19.
  • step S22 the outdoor controller 201 sets an operation frequency obtained by adding a preset third correction value ⁇ Fa to the current operation frequency Fa of the compressor 1 as an operation frequency Fa of the new compressor 1, Control goes to step S23.
  • the operating frequency of the compressor 1 increases, the high-pressure side pressure increases and the low-pressure side pressure decreases. That is, since P35 increases and P36 decreases, the pressure difference ⁇ P increases.
  • the value of the third correction value ⁇ Fa is determined in advance by a test or the like.
  • step S23 the relay controller 203 determines whether or not the pressure difference ⁇ P between the pressure P35 detected by the third pressure sensor 35 and the pressure P36 detected by the fourth pressure sensor 36 is less than the reference value A. to decide.
  • the process proceeds to step S24.
  • the repeater controller 203 determines that the pressure difference ⁇ P is greater than or equal to the reference value A (No in step S23)
  • the process proceeds to step S25.
  • step S24 the outdoor controller 201 determines whether or not the current operation frequency Fa of the compressor 1 is the maximum operation frequency Famax. If the outdoor controller 201 determines that the current operating frequency Fa of the compressor 1 is the maximum operating frequency Famax (Yes in step S24), the process proceeds to step S25. On the other hand, if the outdoor controller 201 determines that the current operating frequency Fa of the compressor 1 is not the maximum operating frequency Famax (No in step S24), the process returns to step S22.
  • step S25 the outdoor controller 201 determines whether or not the reference time tm3 has elapsed. If it is determined that the reference time tm3 has elapsed (Yes in step S25), the outdoor controller 201 ends the process. For example, the operation frequency Fa of the compressor 1, the opening degree LEV11 of the first expansion device 11, and the opening degree LEV12 of the second expansion device 12 may be returned to end the processing. On the other hand, when the outdoor controller 201 determines that the reference time tm3 has not elapsed (No in step S25), the process returns to step S13, and the processes from step S13 to step S25 are repeated at regular intervals. In step S25, the outdoor controller 201 may determine whether or not the pressure difference ⁇ P between the pressures P35 and P36 is less than a preset value.
  • the opening degree LEV11 of the first expansion device 11 of the relay 53 is started at the preset initial opening degree LEV11ini.
  • the first check valves 15a and 15b and the second check valves 16a and 16b can be operated with a pressure difference before and after. For this reason, the valve elements of the first check valves 15a and 15b and the second check valves 16a and 16b vibrate so that the sound that the valve elements collide with the valve seat is continuously generated is started. Therefore, it is possible to drive without making an unpleasant vibration sound.
  • the opening degree LEV11 of the first throttle device 11, the opening degree LEV12 of the second throttle device 12, and the operating frequency Fa of the compressor 1 are maintained such that the pressure difference ⁇ P between P35 and P36 is greater than or equal to the reference value A. Adjust so that it leans. By doing so, the valve elements of the first check valves 15a and 15b and the second check valves 16a and 16b vibrate to suppress the continuous generation of the sound of the valve elements colliding with the valve seat. Therefore, it is possible to drive without making an unpleasant vibration sound.
  • step S ⁇ b> 13 the control is started from step S ⁇ b> 13 to suppress the generation of vibration noise. it can.
  • the overall operation of the air conditioner 100 is controlled by the outdoor controller 201 of the outdoor unit 51.
  • the controller for controlling the operation of the air conditioner 100 includes three types of the outdoor controller 201, the indoor controllers 202a and 202b, and the repeater controller 203. It is not limited and may be less than three types and may be more than three types.
  • the outdoor controller 201 and the repeater controller 203 are examples of the “controller” in the present invention.

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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)
  • Other Air-Conditioning Systems (AREA)

Abstract

L'invention concerne un climatiseur capable de chauffer et de refroidir simultanément, et avec lequel il est possible d'effectuer de manière sélective une opération de refroidissement d'air ou une opération de chauffage d'air avec chaque section intérieure. Dans le climatiseur de la présente invention, un dispositif de relais comprend: une première unité de dérivation connectée à une section extérieure par l'intermédiaire d'une première tuyauterie de fluide frigorigène et d'une seconde tuyauterie de fluide frigorigène, la première unité de dérivation ayant une soupape d'ouverture et de fermeture pour raccorder sélectivement une entrée/sortie de fluide frigorigène d'un échangeur de chaleur intérieur de la section intérieure à la seconde tuyauterie de fluide frigorigène par l'intermédiaire de la première tuyauterie de fluide frigorigène ou d'un séparateur gaz/liquide; une seconde unité de dérivation reliée au séparateur gaz/liquide par l'intermédiaire d'un premier dispositif de diaphragme lorsque l'autre entrée/sortie de fluide frigorigène de l'échangeur de chaleur intérieur de la section intérieure est une entrée de fluide frigorigène, la seconde unité de dérivation ayant un clapet de non-retour relié au côté de sortie du premier dispositif de diaphragme lorsque l'autre entrée/sortie de fluide frigorigène de l'échangeur de chaleur intérieur de la section intérieure est une sortie de fluide frigorigène; et un régulateur pour régler, comme degré d'ouverture du premier dispositif de diaphragme, un degré initial d'ouverture à laquelle la différence de pression en amont et en arrière du premier dispositif de diaphragme soit égale ou supérieure à une valeur de référence pendant le démarrage d'un compresseur.
PCT/JP2016/088831 2016-12-27 2016-12-27 Climatiseur WO2018122943A1 (fr)

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JP2018558549A JP6785880B2 (ja) 2016-12-27 2016-12-27 空気調和装置
PCT/JP2016/088831 WO2018122943A1 (fr) 2016-12-27 2016-12-27 Climatiseur

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023228407A1 (fr) * 2022-05-27 2023-11-30 三菱電機株式会社 Dispositif de climatisation

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS6075864U (ja) * 1983-10-27 1985-05-28 株式会社東芝 空気調和機
JPH04251158A (ja) * 1990-12-28 1992-09-07 Daikin Ind Ltd 冷凍装置の運転制御装置
WO2014106901A1 (fr) * 2013-01-07 2014-07-10 三菱電機株式会社 Dispositif de climatisation

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JPS57175866A (en) * 1981-04-22 1982-10-28 Hitachi Ltd Cooler for automobile
JPH0210059A (ja) * 1988-06-28 1990-01-12 Toshiba Corp 冷凍サイクルの製造方法
JP5826722B2 (ja) * 2012-07-23 2015-12-02 日立アプライアンス株式会社 二元冷凍装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6075864U (ja) * 1983-10-27 1985-05-28 株式会社東芝 空気調和機
JPH04251158A (ja) * 1990-12-28 1992-09-07 Daikin Ind Ltd 冷凍装置の運転制御装置
WO2014106901A1 (fr) * 2013-01-07 2014-07-10 三菱電機株式会社 Dispositif de climatisation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023228407A1 (fr) * 2022-05-27 2023-11-30 三菱電機株式会社 Dispositif de climatisation

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