WO2021014520A1 - Dispositif de climatisation - Google Patents

Dispositif de climatisation Download PDF

Info

Publication number
WO2021014520A1
WO2021014520A1 PCT/JP2019/028595 JP2019028595W WO2021014520A1 WO 2021014520 A1 WO2021014520 A1 WO 2021014520A1 JP 2019028595 W JP2019028595 W JP 2019028595W WO 2021014520 A1 WO2021014520 A1 WO 2021014520A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
source side
heat source
side heat
refrigerant
Prior art date
Application number
PCT/JP2019/028595
Other languages
English (en)
Japanese (ja)
Inventor
淳平 濱口
裕之 森本
隆直 木村
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 CN201980098517.XA priority Critical patent/CN114127493B/zh
Priority to PCT/JP2019/028595 priority patent/WO2021014520A1/fr
Publication of WO2021014520A1 publication Critical patent/WO2021014520A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles

Definitions

  • the present invention relates to an air conditioner having three heat source side heat exchangers and capable of switching the refrigerant flow path of these three heat source side heat exchangers.
  • an air conditioner such as a multi air conditioner for a building
  • a pipe is provided between an outdoor unit (outdoor unit) which is a heat source unit arranged outside the building and an indoor unit (indoor unit) arranged inside the building.
  • outdoor unit outdoor unit
  • indoor unit indoor unit
  • the refrigerant circulates in the refrigerant circuit, and the indoor air is heated or cooled by utilizing the heat radiation or heat absorption of the refrigerant, so that the air-conditioned space is heated or cooled.
  • the plurality of heat exchangers are connected in parallel and the refrigerant flows. As a result, the pressure loss of the evaporator can be reduced, the performance of the evaporator is improved, and the heating performance is improved.
  • the heat exchanger is operated as a condenser when the defrosting operation is performed in order to prevent the evaporator from being frosted and the performance of the evaporator being deteriorated. At that time, since each heat exchanger is connected in series, the heat exchanger on the wake side may have insufficient defrosting ability.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an air conditioner having improved defrosting ability when carrying out a defrosting operation.
  • the compressor, the refrigerant flow path switching device, the load side heat exchanger, the load side drawing device, the first heat source side heat exchanger, the second heat source side heat exchanger and the third heat source The main circuit in which the side heat exchangers are connected by pipes to circulate the refrigerant and the refrigerant flow paths of the first heat source side heat exchanger, the second heat source side heat exchanger, and the third heat source side heat exchanger are switched.
  • a heat exchanger flow path switching device for the purpose and a control device for controlling the heat exchanger flow path switching device are provided, and the control device includes the first heat source side heat exchanger and the second heat source side heat exchange.
  • the refrigerant flow of the first heat source side heat exchanger, the second heat source side heat exchanger and the third heat source side heat exchanger The heat exchanger flow path switching device is controlled so as to switch the path to the parallel refrigerant flow path, and the parallel refrigerant flow path is the first heat source side heat exchanger, the second heat source side heat exchanger, and the third.
  • the first heat source side heat exchanger, the second heat source side heat exchanger, and the third heat source side heat exchanger are connected in parallel to each other in a parallel refrigerant flow path. Since it is switched, it is possible to provide an air conditioner with improved defrosting ability.
  • FIG. It is a schematic circuit block diagram which shows an example of the circuit structure of the air conditioner 100 which concerns on Embodiment 1.
  • FIG. It is a refrigerant circuit diagram which shows the flow of the refrigerant in the cooling operation mode of the air conditioner 100 which concerns on Embodiment 1.
  • FIG. It is a refrigerant circuit diagram which shows the flow of the refrigerant in the heating operation mode of the air conditioner 100 which concerns on Embodiment 1.
  • FIG. It is a refrigerant circuit diagram which shows the flow of the refrigerant in the defrost operation mode of the air conditioner 100 which concerns on Embodiment 1.
  • FIG. It is a flowchart for demonstrating operation of the control device of the air conditioner 100 which concerns on Embodiment 1.
  • FIG. 1 is a schematic circuit configuration diagram showing an example of the circuit configuration of the air conditioner 100 according to the first embodiment.
  • the air conditioner 100 shown in FIG. 1 has a configuration in which an outdoor unit 1 and an indoor unit 2 are connected by a first main pipe 4a and a second main pipe 4b.
  • FIG. 1 shows an example in which one indoor unit 2 is connected to the outdoor unit 1 via the first main pipe 4a and the second main pipe 4b.
  • the number of indoor units 2 connected to the outdoor unit 1 is not limited to one, and a plurality of indoor units may be connected.
  • the outdoor unit 1 includes a compressor 10, a first four-way valve 11, a second four-way valve 12, a first heat source side heat exchanger 13a, and a second heat source side heat exchanger 13b as components of the main circuit. , And a third heat source side heat exchanger 13c.
  • the first four-way valve 11 and the second four-way valve 12 correspond to the refrigerant flow path switching device.
  • the main circuits are the compressor 10, the first four-way valve 11, the second four-way valve 12, the load side heat exchanger 21, the load side throttle device 22, the first heat source side heat exchanger 13a, and the second heat source side heat exchanger 13b.
  • the third heat source side heat exchanger 13c are sequentially connected by the refrigerant pipe 3, and the refrigerant circulates.
  • the refrigerant pipe 3 is a general term for pipes for circulating the refrigerant used in the air conditioner 100.
  • the refrigerant pipe 3 includes, for example, a first main pipe 4a, a second main pipe 4b, a first main pipe 5a, a second main pipe 5b, a series parallel switching pipe 6, a series outlet pipe 7, a parallel inlet / outlet pipe 8, and a first inlet / outlet pipe 9a.
  • heat source side heat exchanger other heat source side heat exchangers may be provided in addition to the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c. ..
  • the first main pipe 4a and the second main pipe 4b connect the outdoor unit 1 and the indoor unit 2.
  • the first main pipe 5a connects the first four-way valve 11 and the first header 14a.
  • the second main pipe 5b connects the second four-way valve 12 and the second header 14b.
  • the series-parallel switching pipe 6 joins the fourth header 14d and the second header 14b and connects to the second four-way valve 12 via the second main pipe 5b. That is, the series-parallel switching pipe 6 connects the second header 14b and the fourth header 14d.
  • the parallel inlet / outlet pipe 8 is connected to the first inlet / outlet pipe 9a, the second inlet / outlet pipe 9b, and the third inlet / outlet pipe 9c, respectively, and connects to the second main pipe 4b leading to the load side throttle device 22.
  • the series outlet pipe 7 connects the connection portion in which the series / parallel switching pipe 6 and the fourth header 14d are connected and the second main pipe 4b leading to the load side throttle device 22.
  • the outdoor unit 1 has a first switchgear 31, a second switchgear 32, a first opening / closing device 33 capable of adjusting a Cv value, and a second opening / closing device 33 as heat exchanger flow path switching devices. It has an adjusting device 34 and.
  • the outdoor unit 1 is equipped with a fan 16 which is a blower.
  • the fan 16 includes a top flow type or first heat source side heat exchanger 13a located above the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c.
  • a side flow method or the like located on the side of the two heat source side heat exchangers 13b and the third heat source side heat exchanger 13c is adopted.
  • the compressor 10 sucks in the refrigerant and compresses it into a high temperature and high pressure state.
  • the compressor 10 is composed of, for example, an inverter compressor whose capacity can be controlled.
  • the compressor 10 uses, for example, a low-pressure shell structure having a compression chamber in a closed container, the inside of the closed container having a low-pressure refrigerant pressure atmosphere, and sucking and compressing the low-pressure refrigerant in the closed container.
  • the first four-way valve 11 and the second four-way valve 12 switch between the refrigerant flow path in the cooling operation mode and the defrosting operation mode and the refrigerant flow path in the heating operation mode.
  • the cooling operation mode is a case where at least one of the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c is used as a condenser or a gas cooler.
  • the first embodiment has a cooling operation mode and a heating operation mode.
  • the heating operation mode is a case where the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the evaporator.
  • the first four-way valve 11 supplies or shuts off the refrigerant discharged from the compressor 10 to the first heat source side heat exchanger 13a.
  • the second four-way valve 12 supplies the refrigerant discharged from the compressor 10 to either the second heat source side heat exchanger 13b, the third heat source side heat exchanger 13c, or the load side heat exchanger 21.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c include a plurality of heat transfer tubes which are heat exchanger components and a plurality of heat exchanger components. It has fins and.
  • Multiple heat transfer tubes are flat tubes or circular tubes, respectively.
  • the plurality of heat transfer tubes extend in the horizontal direction.
  • the plurality of heat transfer tubes form a plurality of refrigerant flow paths in the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c.
  • the plurality of fins are plate-shaped and are stacked at predetermined intervals.
  • the plurality of fins extend in the vertical direction which is orthogonal to the extending direction of the heat transfer tube, and the plurality of heat transfer tubes are inserted therethrough.
  • the first heat source side heat exchanger 13a is arranged independently of the second heat source side heat exchanger 13b and the third heat source side heat exchanger 13c.
  • the second heat source side heat exchanger 13b is arranged above the third heat source side heat exchanger 13c on the vertical line.
  • the first heat source side heat exchanger 13a is provided with one first header 14a and one first distributor 15a.
  • the second heat source side heat exchanger 13b is arranged above the vertical line of the third heat source side heat exchanger 13c.
  • a part of the second heat source side heat exchanger 13b is integrally formed with the third heat source side heat exchanger 13c by sharing fins which are heat exchanger components. That is, a part of the second heat source side heat exchanger 13b and a part of the third heat source side heat exchanger 13c have their heat transfer tubes inserted into the same fins.
  • the remaining part other than a part of the second heat source side heat exchanger 13b is configured independently of the third heat source side heat exchanger 13c. That is, the heat transfer tubes are inserted into different fins except for a part of the second heat source side heat exchanger 13b and a part of the third heat source side heat exchanger 13c.
  • the second heat source side heat exchanger 13b is provided with one second header 14b and one second distributor 15b.
  • the third heat source side heat exchanger 13c is provided with one third header 14c and one fourth header 14d.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c function as a condenser in the cooling operation mode and the defrosting operation mode, and an evaporator in the heating operation mode. It functions as.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c exchange heat between the air supplied from the fan 16 and the refrigerant flowing through the plurality of heat transfer tubes. I do.
  • In the cooling operation mode depending on the various modes, only all or a part of the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c function as a condenser.
  • the total heat transfer area of the heat transfer area of the first heat source side heat exchanger 13a and the heat transfer area of the second heat source side heat exchanger 13b is calculated from the heat transfer area of the third heat source side heat exchanger 13c. Is also formed to be large. Therefore, the number of sums of the number of heat transfer tubes of the first heat source side heat exchanger 13a and the second heat source side heat exchanger 13b is larger than the number of heat transfer tubes of the third heat source side heat exchanger 13c.
  • the first header 14a is a refrigerant flow path on the inlet side of the first heat source side heat exchanger 13a when the first heat source side heat exchanger 13a is used as a condenser in the cooling operation mode and the defrosting operation mode. It is provided at the position where
  • the first header 14a has a plurality of branch pipes, which are thin pipes connected to the heat transfer pipes of the first heat source side heat exchanger 13a, and a main pipe to which the plurality of branch pipes are connected.
  • the main pipe is connected to the first main pipe 5a which is connected to the first four-way valve 11.
  • the upper part of the main pipe is connected to the first main pipe 5a.
  • the first header 14a contains a plurality of refrigerants that have flowed into the main pipe from the first main pipe 5a when the first heat source side heat exchanger 13a is used as a condenser in the cooling operation mode and the defrosting operation mode. It flows into the first heat source side heat exchanger 13a through the branch pipe.
  • the first header 14a allows the refrigerant flowing out from the first heat source side heat exchanger 13a to a plurality of branch pipes to flow through the main pipe to the first main pipe 5a. To leak to.
  • the second header 14b is a refrigerant flow path on the inlet side of the second heat source side heat exchanger 13b when the second heat source side heat exchanger 13b is used as a condenser in the cooling operation mode and the defrosting operation mode. It is provided at the position where The second header 14b has a plurality of branch pipes, which are thin pipes connected to the heat transfer pipes of the second heat source side heat exchanger 13b, and a main pipe to which the plurality of branch pipes are connected.
  • the main pipe is connected to the second main pipe 5b which is connected to the second four-way valve 12.
  • the lower part of the main pipe is connected to the second main pipe 5b.
  • the second header 14b contains a plurality of refrigerants that have flowed into the main pipe from the second main pipe 5b when the second heat source side heat exchanger 13b is used as a condenser in the cooling operation mode and the defrosting operation mode. It flows into the second heat source side heat exchanger 13b through the branch pipe.
  • the second header 14b allows the refrigerant flowing out from the second heat source side heat exchanger 13b to a plurality of branch pipes to flow through the main pipe to the second main pipe 5b. To leak to.
  • the third header 14c is located at a position that serves as a refrigerant flow path on the inlet side of the third heat source side heat exchanger 13c when the third heat source side heat exchanger 13c is used as a condenser or an evaporator in the cooling operation mode. It is provided.
  • the third header 14c has a plurality of branch pipes, which are thin pipes connected to the heat transfer pipes of the third heat source side heat exchanger 13c, and a main pipe to which the plurality of branch pipes are connected.
  • the main pipe is connected to the parallel entrance / exit pipe 8.
  • the lower part of the main pipe is connected to the parallel inlet / outlet pipe 8.
  • the third header 14c is a third heat source through a plurality of branch pipes, when the third heat source side heat exchanger 13c is used as a condenser or an evaporator in the cooling mode, the refrigerant flowing into the main pipe from the parallel inlet / outlet pipe 8 is used. It flows into the side heat exchanger 13c.
  • the third header 14c allows the refrigerant flowing out from the third heat source side heat exchanger 13c to the plurality of branch pipes through the main pipe when the third heat source side heat exchanger 13c is used as a condenser in the defrosting operation mode. It flows out to the parallel entrance / exit pipe 8.
  • the fourth header 14d is provided at a position that serves as a refrigerant flow path on the inlet side of the third heat source side heat exchanger 13c when the third heat source side heat exchanger 13c is used as a condenser in the defrosting operation mode. ing.
  • the fourth header 14d has a plurality of branch pipes, which are thin pipes connected to the heat transfer pipes of the third heat source side heat exchanger 13c, and a main pipe to which the plurality of branch pipes are connected.
  • the main pipe is connected to the series-parallel switching pipe 6 and the series outlet pipe 7.
  • the lower part of the main pipe is connected to the series-parallel switching pipe 6 and the series outlet pipe 7.
  • the fourth header 14d receives the refrigerant flowing out from the third heat source side heat exchanger 13c into a plurality of branch pipes when the third heat source side heat exchanger 13c is used as a condenser and an evaporator in the cooling operation mode. It flows out to the series-parallel switching pipe 6 through the main pipe.
  • the first distributor 15a is provided at a position that serves as a refrigerant flow path on the inlet side of the first heat source side heat exchanger 13a when the first heat source side heat exchanger 13a is used as an evaporator.
  • the first distributor 15a has a plurality of thin pipes connected to the heat transfer tubes of the first heat source side heat exchanger 13a, and a main body which is a confluence portion in which the plurality of thin pipes are merged into one. ing.
  • the main body is connected to the first entrance / exit pipe 9a connected to the parallel entrance / exit pipe.
  • the first distributor 15a allows the refrigerant flowing out from the first heat source side heat exchanger 13a to a plurality of thin pipes to flow through the main body to the first inlet / outlet pipe 9a. Leak to.
  • the first distributor 15a allows the refrigerant flowing into the main body from the first inlet / outlet pipe 9a to pass through a plurality of thin pipes to the first heat source side heat exchanger 13a. Inflow to.
  • the second distributor 15b is provided at a position that serves as a refrigerant flow path on the inlet side of the second heat source side heat exchanger 13b when the second heat source side heat exchanger 13b is used as an evaporator.
  • the second distributor 15b has a plurality of thin pipes connected to the heat transfer tubes of the second heat source side heat exchanger 13b, and a main body which is a confluence portion in which the plurality of thin pipes are merged into one. ing.
  • the main body is connected to a second entrance / exit pipe 9b connected to a parallel entrance / exit pipe.
  • the second distributor 15b allows the refrigerant flowing out from the second heat source side heat exchanger 13b to a plurality of thin pipes to flow through the main body to the second inlet / outlet pipe 9b. Leak to.
  • the second distributor 15b allows the refrigerant flowing into the main body from the second inlet / outlet pipe 9b to pass through the plurality of thin pipes to the second heat source side heat exchanger 13b. Inflow to.
  • the series-parallel switching pipe 6 connects the fourth header 14d, the second header 14b, and the second main pipe 5b.
  • the series-parallel switching pipe 6 sends the refrigerant flowing out from the fourth header 14d to the outlet of the second header 14b via the first opening degree adjusting device 33. Let the refrigerant flow out.
  • the series-parallel switching pipe 6 is provided with a first opening degree adjusting device 33.
  • the first entrance / exit pipe 9a connects the first distributor 15a and the parallel entrance / exit pipe 8.
  • the first inlet / outlet pipe 9a is in a two-phase state with low dryness when the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as evaporators.
  • the liquid low-pressure refrigerant flows into the first heat source side heat exchanger 13a via the first distributor 15a.
  • the second entrance / exit pipe 9b connects the second distributor 15b and the parallel entrance / exit pipe 8.
  • the second inlet / outlet pipe 9b is in a two-phase state with low dryness when the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as evaporators.
  • the liquid low-pressure refrigerant flows into the second heat source side heat exchanger 13b via the second opening degree adjusting device 34 and the second distributor 15b.
  • a second opening degree adjusting device 34 is provided in the second entrance / exit pipe 9b.
  • the third entrance / exit pipe 9c connects the third header 14c and the parallel entrance / exit pipe 8.
  • the third inlet / outlet pipe 9c is in a two-phase state with low dryness when the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as evaporators.
  • the liquid low-pressure refrigerant flows into the third heat source side heat exchanger 13c via the third header 14c.
  • the parallel inlet / outlet pipe 8 connects the first inlet / outlet pipe 9a, the second inlet / outlet pipe 9b, and the third inlet / outlet pipe 9c to the second main pipe 4b.
  • the parallel inlet / outlet pipe 8 is in a two-phase state or liquid with low dryness when the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as evaporators.
  • the low-pressure refrigerant in the state is branched into the first inlet / outlet pipe 9a, the second inlet / outlet pipe 9b, and the third inlet / outlet pipe 9c via the first opening / closing device 31.
  • the parallel entrance / exit pipe 8 is provided with a first switchgear 31.
  • the series outlet pipe 7 connects the fourth header 14d and the second main pipe 4b via the second switchgear 32.
  • the series outlet pipe 7 is a second opening / closing device when the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as a condenser in the cooling operation mode.
  • a high-pressure liquid refrigerant flows into the second main pipe 4b via the 32.
  • the series outlet pipe 7 is provided with a second switchgear 32.
  • the first switchgear 31 is arranged in the parallel inlet / outlet pipe 8 and passes or shuts off the refrigerant flowing from the second main pipe 4b into the parallel inlet / outlet pipe 8. That is, the first opening / closing device 31 is closed so that the refrigerant flowing out from the first heat source side heat exchanger 13a and the second heat source side heat exchanger 13b does not flow into the second main pipe 4b in the cooling operation mode. Further, in the heating operation mode, the refrigerant flowing out from the second main pipe 4b is opened so as to flow into the parallel inlet / outlet pipe 8.
  • the refrigerant flowing out from the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c is opened so as to flow into the second main pipe 4b.
  • the first switchgear 31 is an on-off valve, and is configured to open and close the flow path of the refrigerant such as a two-way valve, a solenoid valve, and an electronic expansion valve.
  • the second switchgear 32 is arranged in the series outlet pipe 7 and passes or shuts off the refrigerant flowing through the series outlet pipe 7. That is, the second switchgear 32 is opened so that the refrigerant flowing out of the fourth header 14d flows into the second main pipe in the cooling operation mode. Further, in the heating operation mode, the refrigerant flowing out from the second main pipe does not pass through the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c to the second main pipe 5b. It is closed so that it does not flow in. Further, in the defrosting operation mode, the refrigerant flowing out from the second main pipe is closed so as not to flow out to the second main pipe without passing through the second heat source side heat exchanger 13b and the third heat source side heat exchanger 13c.
  • the second switchgear 32 is an on-off valve, and is configured to open and close the flow path of the refrigerant such as a two-way valve, a solenoid valve, and an electronic expansion valve.
  • the first opening degree adjusting device 33 is arranged in the series-parallel switching pipe 6 and passes or shuts off the refrigerant flowing through the series-parallel switching pipe 6. That is, the first opening degree adjusting device 33 is closed so that the high temperature and high pressure refrigerant does not flow into the third heat source side heat exchanger 13c in the cooling operation mode. Further, in the heating operation mode, the Cv value is adjusted in order to adjust the amount of the refrigerant flowing into the third heat source side heat exchanger 13c from the parallel inlet / outlet pipe. Further, in the defrosting operation mode, the high-temperature and high-pressure refrigerant is opened so as to flow into the third heat source side heat exchanger 13c.
  • the first opening degree adjusting device 33 is composed of a throttle device capable of adjusting the flow rate of the refrigerant by changing the opening degree of, for example, an electronic expansion valve.
  • the second opening / closing adjusting device 34 is arranged in the second inlet / outlet pipe 9b, and passes or shuts off the refrigerant flowing through the second inlet / outlet pipe 9b. That is, the second opening degree adjusting device 34 is opened so that the refrigerant flowing out from the second heat source side heat exchanger 13b flows into the parallel inlet / outlet pipe 8 in the cooling operation mode. Further, in the heating operation mode, the Cv value is adjusted in order to adjust the amount of the refrigerant flowing into the second heat source side heat exchanger 13b from the parallel inlet / outlet pipe. Further, in the defrosting operation mode, the refrigerant flowing out from the second heat source side heat exchanger 13b is opened so as to flow into the parallel inlet / outlet pipe 8.
  • the second opening degree adjusting device 34 is composed of a throttle device capable of adjusting the flow rate of the refrigerant by changing the opening degree of, for example, an electronic expansion valve.
  • the indoor unit 2 has a load-side heat exchanger 21 and a load-side throttle device 22 as components of the main circuit.
  • the load side heat exchanger 21 is connected to the outdoor unit 1 via the first main pipe 4a and the second main pipe 4b.
  • the load-side heat exchanger 21 exchanges heat between the air leading to the indoor space and the refrigerant flowing through the first main pipe 4a or the second main pipe 4b, and supplies heating air or cooling to the indoor space. Generates air for use. Indoor air is blown to the load side heat exchanger 21 from a blower such as a fan (not shown).
  • the load-side throttle device 22 is composed of, for example, an electronic expansion valve whose opening degree is mutably controlled, has a function as a pressure reducing valve or an expansion valve, and decompresses and expands the refrigerant. ..
  • the load-side throttle device 22 is provided on the upstream side of the load-side heat exchanger 21 in the cooling operation mode and the defrosting operation mode.
  • the control device 60 is composed of a microcomputer or the like and is provided in the outdoor unit 1, and controls various devices of the air conditioner 100 based on the detection information detected by various sensors and the instruction from the remote controller.
  • the objects controlled by the control device 60 are the drive frequency of the compressor 10, the rotation speed including ON or OFF of the fan 16, the switching of the first four-way valve 11, the switching of the second four-way valve 12, and the opening and closing of the first switchgear 31. , Opening / closing of the second opening / closing device 32, opening / closing / opening / closing of the first opening / closing device 33, opening / closing / opening / closing of the second opening / closing device 34, opening / closing of the load side throttle device 22 and the like. By controlling various devices in this way, the control device 60 executes each operation mode described later.
  • the control device 60 is composed of dedicated hardware or a CPU (also referred to as a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microprocessor, or a processor) that executes a program stored in a memory. ..
  • a CPU also referred to as a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microprocessor, or a processor
  • the control device 60 corresponds to, for example, a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • each function executed by the control device 60 is realized by software, firmware, or a combination of software and firmware.
  • Software and firmware are written as programs and stored in memory.
  • the CPU realizes each function of the control device 60 by reading and executing a program stored in the memory.
  • the memory is a non-volatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, or an EEPROM. It should be noted that a part of the functions of the control device 60 may be realized by dedicated hardware, and a part may be realized by software or firmware.
  • control device 60 is provided in the outdoor unit 1 .
  • control device may be provided for each unit or may be provided in the indoor unit 2.
  • each operation mode executed by the air conditioner 100 performs a cooling operation mode or a heating operation mode based on an instruction from the indoor unit 2, and a defrosting operation mode based on an instruction from the control device 60.
  • the operation modes executed by the air conditioner 100 shown in FIG. 1 include three cooling operation modes in which the driving indoor unit 2 executes the cooling operation, and the driving indoor unit 2 executes the heating operation. There is a heating operation mode and a defrosting operation mode in which the driving air conditioner 100 executes a defrosting operation.
  • FIG. 2 is a refrigerant circuit diagram showing the flow of the refrigerant in the cooling operation mode of the air conditioner 100 according to the first embodiment.
  • FIG. 2 the flow of the refrigerant in the heavy load cooling operation mode will be described by taking the case where a large cooling heat load is generated in the load side heat exchanger 21 as an example.
  • the flow direction of the refrigerant is indicated by a solid arrow.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 branches into the first four-way valve 11 and the second four-way valve 12 and flows in. Then, the refrigerant that has flowed into the first four-way valve 11 flows into the first heat source side heat exchanger 13a through the first main pipe 5a.
  • the refrigerant flowing into the second four-way valve 12 flows into the second heat source side heat exchanger 13b through the second main pipe 5b.
  • the first opening degree adjusting device 33 is switched to the closed state. Therefore, the high-temperature and high-pressure gas refrigerant flowing through the second main pipe 5b does not flow into the third heat source side heat exchanger 13c via the series-parallel switching pipe 6.
  • the gas refrigerant flowing into the first heat source side heat exchanger 13a becomes a high-pressure two-phase or liquid refrigerant while radiating heat to the outdoor air supplied from the fan 16 by the first heat source side heat exchanger 13a. Further, the gas refrigerant flowing into the second heat source side heat exchanger 13b becomes a high-pressure two-phase or liquid refrigerant while radiating heat to the outdoor air supplied from the fan 16 by the second heat source side heat exchanger 13b.
  • the high-pressure two-phase or liquid refrigerant flowing out of the first heat source side heat exchanger 13a flows into the parallel inlet / outlet pipe 8 through the first inlet / outlet pipe 9a. Further, the high-pressure two-phase or liquid refrigerant flowing out from the second heat source side heat exchanger 13b flows into the parallel inlet / outlet pipe 8 through the second inlet / outlet pipe 9b. As a result, the high-pressure two-phase or liquid refrigerant flowing out of the first heat source side heat exchanger 13a and the high-pressure two-phase or liquid refrigerant flowing out of the second heat source side heat exchanger 13b merge at the parallel inlet / outlet pipe 8. To do. At this time, the first switchgear 31 is switched to the closed state. Therefore, the high-pressure two-phase or liquid refrigerant flowing out of the first heat source side heat exchanger 13a or the second heat source side heat exchanger 13b does not flow into the second main pipe 4b via the parallel inlet / outlet pipe 8.
  • the combined high-pressure two-phase or liquid refrigerant flows into the third heat source side heat exchanger 13c. Then, the inflowing high-pressure two-phase or liquid refrigerant becomes a high-pressure liquid refrigerant while radiating heat to the outdoor air supplied from the fan 16 by the third heat source side heat exchanger 13c.
  • This high-pressure liquid refrigerant flows out from the outdoor unit 1 through the series outlet pipe 7 in which the second switchgear 32 switched to the open state is arranged, passes through the second main pipe 4b, and flows into the indoor unit 2.
  • the first heat source side heat exchanger 13a and the second heat source side heat exchanger 13b are parallel to each other on the upstream side, and the first heat source side heat is on the downstream side.
  • the third heat source side heat exchanger 13c is connected in series to the exchanger 13a and the second heat source side heat exchanger 13b.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as condensers, and the first four-way valve 11 is used from the compressor 10.
  • the discharged refrigerant is supplied to the first heat source side heat exchanger 13a, the refrigerant discharged from the compressor 10 by the second four-way valve 12 is supplied to the second heat source side heat exchanger 13b, and the first opening / closing device 31 is operated.
  • the second opening / closing device 32 is opened, the first opening / closing adjusting device 33 is closed, and the second opening / closing adjusting device 34 is opened.
  • the high-pressure liquid refrigerant is expanded by the load-side throttle device 22 to become a low-temperature low-pressure gas-liquid two-phase state refrigerant.
  • the gas-liquid two-phase state refrigerant flows into the load side heat exchanger 21 used as an evaporator and absorbs heat from the indoor air to become a low-temperature low-pressure gas refrigerant while cooling the indoor air.
  • the opening degree of the load side throttle device 22 is controlled by the control device 60 so that the degree of superheat becomes constant.
  • the gas refrigerant flowing out of the load side heat exchanger 21 flows into the outdoor unit 1 again through the first main pipe 4a.
  • the gas refrigerant that has flowed into the outdoor unit 1 is sucked into the compressor 10 again through the second four-way valve 12.
  • the third heat source side heat exchanger 13c is connected to the first heat source side heat exchanger 13a and the second heat source side heat exchanger 13b as a series refrigerant flow path.
  • the flow velocity of the refrigerant increases, and the performance of the condenser can be improved.
  • the flow velocity of the refrigerant is slow, it is possible to prevent the refrigerant from accumulating as a liquid refrigerant in the third heat source side heat exchanger 13c on the downstream side.
  • first heat source side heat exchanger 13a is independently arranged without division, and is provided with one first header 14a and one first distributor 15a.
  • second heat source side heat exchanger 13b and the third heat source side heat exchanger 13c are partially integrally configured.
  • the second heat source side heat exchanger 13b is provided with one second header 14b and one second distributor 15b.
  • the third heat source side heat exchanger 13c is provided with one third header 14c and one fourth header 14d. Therefore, the cost can be suppressed and the installation space can be narrowed as compared with the configuration in which two or more headers and distributors are provided in one heat source side heat exchanger.
  • the volume ratio between the upstream side and the downstream side is such that the inflow refrigerant of the third heat source side heat exchanger 13c on the downstream side becomes a refrigerant with low dryness. This is to adjust.
  • FIG. 3 is a refrigerant circuit diagram showing the flow of the refrigerant in the heating operation mode of the air conditioner 100 according to the first embodiment.
  • FIG. 3 the flow of the refrigerant in the heating operation mode will be described by taking as an example a case where a thermal load is generated in the load side heat exchanger 21.
  • the flow direction of the refrigerant is indicated by a solid arrow.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the second four-way valve 12 and flows out from the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant flowing out of the outdoor unit 1 passes through the first main pipe 4a and is dissipated to the indoor air by the load side heat exchanger 21 to become a liquid refrigerant while heating the indoor space.
  • the opening degree of the load side throttle device 22 is controlled by the control device 60 so that the degree of supercooling becomes constant.
  • the liquid refrigerant flowing out from the load side heat exchanger 21 is expanded by the load side throttle device 22 to become a gas-liquid two-phase state refrigerant at medium temperature and medium pressure, and passes through the second main pipe 4b to the outdoor unit 1 again. Inflow.
  • the medium-temperature, medium-pressure, gas-liquid, two-phase refrigerant that has flowed into the outdoor unit 1 passes through the first switchgear 31 that has been switched to the open state, and flows into the parallel inlet / outlet pipe 8.
  • the refrigerant flowing into the parallel inlet / outlet pipe 8 flows into the first inlet / outlet pipe 9a, the second inlet / outlet pipe 9b, and the third inlet / outlet pipe 9c in parallel, and flows into the first heat source side heat exchanger 13a and the second heat source side heat exchanger, respectively. It flows into 13b and the third heat source side heat exchanger 13c.
  • the second switchgear 32 is switched to the closed state. Therefore, the refrigerant flowing through the second main pipe 4b does not flow into the series-parallel switching pipe 6.
  • the first opening degree adjusting device 33 adjusts the amount of refrigerant flowing into the third heat source side heat exchanger 13c by changing the opening degree so that each heat exchanger has an optimum refrigerant circulation amount in the heating operation mode.
  • the second opening degree adjusting device 34 adjusts the amount of refrigerant flowing into the second heat source side heat exchanger 13b by changing the opening degree so that each heat exchanger has an optimum refrigerant circulation amount in the heating operation mode. ..
  • the refrigerant that has flowed into the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c is the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and The heat exchanger 13c on the third heat source side absorbs heat from the outdoor air and becomes a low-temperature low-pressure gas refrigerant.
  • the refrigerant flowing out of the first heat source side heat exchanger 13a flows into the suction side of the compressor 10 through the first four-way valve 11. Further, the refrigerant flowing out from the third heat source side heat exchanger 13c passes through the series-parallel switching pipe 6 in which the second opening degree adjusting device 34 that has been switched to the open state is arranged.
  • the refrigerant that flows out of the third heat source side heat exchanger 13c and passes through the series-parallel switching pipe 6 in which the second opening degree adjusting device 34 is arranged is in the second main pipe 5b in the second heat source side heat exchanger 13b. It merges with the refrigerant flowing out from the compressor, passes through the second four-way valve 12, and flows into the suction side of the compressor 10.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the heating operation mode, the first heat source side heat exchanger 13a and the second heat source
  • the side heat exchanger 13b and the third heat source side heat exchanger 13c are connected in parallel with each other by a parallel refrigerant flow path.
  • the first four-way valve 11 shuts off the refrigerant discharged from the compressor 10
  • the second four-way valve 12 supplies the refrigerant discharged from the compressor 10 to the load side heat exchanger 21. 1
  • the opening / closing device 31 is opened, the second opening / closing device 32 is closed, the first opening / closing device 33 is opened, and the second opening / closing device 34 is open.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are connected in parallel.
  • the pressure loss of the refrigerant flowing through the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c is reduced, and the performance of the evaporator can be improved.
  • FIG. 4 is a refrigerant circuit diagram showing the flow of the refrigerant in the defrosting operation mode of the air conditioner 100 according to the first embodiment.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 branches into the first four-way valve 11 and the second four-way valve 12 and flows in. Then, the refrigerant that has flowed into the first four-way valve 11 flows into the first heat source side heat exchanger 13a through the first main pipe 5a.
  • the refrigerant flowing into the second four-way valve 12 flows into the second heat source side heat exchanger 13b through the second main pipe 5b.
  • the first opening degree adjusting device 33 is switched to the open state. Therefore, the high-temperature and high-pressure gas refrigerant flowing through the second main pipe 5b flows into the third heat source side heat exchanger 13c via the series-parallel switching pipe 6.
  • the second switchgear 32 is switched to the closed state. Therefore, the high-temperature and high-pressure gas refrigerant flowing through the series-parallel switching pipe 6 does not flow into the second main pipe 4b via the series outlet pipe 7.
  • the gas refrigerant flowing into the first heat source side heat exchanger 13a becomes a high-pressure two-phase or liquid refrigerant while melting the frost frosted on the heat exchanger at the first heat source side heat exchanger 13a.
  • the gas refrigerant flowing into the second heat source side heat exchanger 13b becomes a high-pressure two-phase or liquid refrigerant while melting the frost frosted on the heat exchanger at the second heat source side heat exchanger 13b.
  • the gas refrigerant flowing into the third heat source side heat exchanger 13c becomes a high-pressure two-phase or liquid refrigerant while melting the frost frosted on the heat exchanger by the third heat source side heat exchanger 13c.
  • the high-pressure two-phase or liquid refrigerant flowing out of the first heat source side heat exchanger 13a flows into the parallel inlet / outlet pipe 8 through the first inlet / outlet pipe 9a. Further, the high-pressure two-phase or liquid refrigerant flowing out from the second heat source side heat exchanger 13b flows into the parallel inlet / outlet pipe 8 through the second inlet / outlet pipe 9b. Further, the high-pressure two-phase or liquid refrigerant flowing out from the third heat source side heat exchanger 13c flows into the parallel inlet / outlet pipe 8 through the third inlet / outlet pipe 9c.
  • the high-pressure two-phase or liquid refrigerant flowing out of the first heat source side heat exchanger 13a, the high-pressure two-phase or liquid refrigerant flowing out of the second heat source side heat exchanger 13b, and the third heat source side heat exchanger merges at the parallel inlet / outlet pipe 8.
  • the first opening / closing device 31 is switched to the open state. Therefore, the high-pressure two-phase or liquid refrigerant flowing out of the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c passes through the parallel inlet / outlet pipe 8. 2 Passes through the main pipe 4b and flows into the indoor unit 2.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are connected in parallel in the defrosting operation mode.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as condensers, and the compressor 10 is used by the first four-way valve 11.
  • the refrigerant discharged from the compressor 10 is supplied to the first heat source side heat exchanger 13a, and the refrigerant discharged from the compressor 10 is supplied to the second heat source side heat exchanger 13b by the second four-way valve 12, and the first switching device 31
  • the second opening / closing device 32 is closed, the first opening / closing adjusting device 33 is opened, and the second opening / closing adjusting device 34 is opened.
  • the high-pressure liquid refrigerant is expanded by the load-side throttle device 22 to become a low-temperature low-pressure gas-liquid two-phase state refrigerant.
  • the gas-liquid two-phase state refrigerant flows into the load side heat exchanger 21 used as an evaporator and absorbs heat from the indoor air to become a low-temperature low-pressure gas refrigerant while cooling the indoor air.
  • the opening degree of the load side throttle device 22 is controlled by the control device 60 so that the opening degree is fully opened.
  • the gas refrigerant flowing out of the load side heat exchanger 21 flows into the outdoor unit 1 again through the first main pipe 4a.
  • the gas refrigerant that has flowed into the outdoor unit 1 is sucked into the compressor 10 again through the second four-way valve 12.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c operate as a condenser, but as a parallel refrigerant flow path. Connect.
  • the high-temperature and high-pressure refrigerant flows in parallel to the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c, and the maximum defrosting ability is obtained.
  • FIG. 5 is a flowchart for explaining the operation of the control device 60 of the air conditioner 100 according to the first embodiment.
  • the control device 60 determines whether or not the control device 60 is in the cooling operation mode (S11).
  • the heat exchanger flow path switching device includes the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the second. 3 An instruction is given to switch the refrigerant flow path of the heat source side heat exchanger 13c to the series refrigerant flow path (S12).
  • the control device 60 uses the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c as a condenser, and compresses with the first four-way valve 11.
  • the refrigerant discharged from the machine 10 is supplied to the first heat source side heat exchanger 13a, and the refrigerant discharged from the compressor 10 is supplied to the second heat source side heat exchanger 13b by the second four-way valve 12, and the first opening / closing is performed.
  • Control is performed so that the device 31 is opened, the second opening / closing device 32 is opened, the first opening / closing device 33 is closed, and the second opening / closing device 34 is opened.
  • step S11 when it is determined that the control device 60 is not in the cooling operation mode (NO in S11), and after the processing in step S12, it is determined whether or not the control device 60 is in the heating operation mode (S13).
  • step S13 When it is determined in step S13 that the control device 60 is in the heating operation mode (YES in S13), the control device 60 connects the heat exchanger flow path switching device to the first heat source side heat exchanger 13a and the second heat source side heat exchange. An instruction is given to switch the refrigerant flow path of the device 13b and the third heat source side heat exchanger 13c to the parallel refrigerant flow path (S14).
  • the control device 60 shuts off the refrigerant discharged from the compressor 10 by the first four-way valve 11, and sends the refrigerant discharged from the compressor 10 by the second four-way valve 12 to the load side heat exchanger 21.
  • the first opening / closing device 31 is opened, the second opening / closing device 32 is closed, the first opening / closing device 33 is opened, and the second opening / closing device 34 is opened.
  • step S13 when it is determined that the control device 60 is not in the heating operation mode (NO in S13), and after the processing in step S14, it is determined whether or not the control device 60 is in the defrosting operation mode (S15).
  • step S15 When it is determined in step S15 that the control device 60 is in the defrosting operation mode (YES in S15), the control device 60 is connected to the heat exchanger flow path switching device with the first heat source side heat exchanger 13a and the second heat source side heat. An instruction is given to switch the refrigerant flow paths of the exchanger 13b and the third heat source side heat exchanger 13c to parallel refrigerant flow paths (S16).
  • control device 60 supplies the refrigerant discharged from the compressor 10 by the first four-way valve 11 to the first heat source side heat exchanger 13a, and discharges the refrigerant from the compressor 10 by the second four-way valve 12.
  • the refrigerant is supplied to the second heat source side heat exchanger 13b, the first opening / closing device 31 is opened, the second opening / closing device 32 is closed, the first opening / closing device 33 is opened, and the second opening / closing device 34 is opened. Is controlled so as to open.
  • step S15 If it is determined in step S15 that the control device 60 is not in the defrosting operation mode (NO in S15), and after the processing in step S16, the process returns to step S11.
  • the air conditioner 100 includes the compressor 10, the first four-way valve 11, the second four-way valve 12, the load side heat exchanger 21, the load side throttle device 22, and at least the first heat source.
  • the side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are connected by a refrigerant pipe 3 to include a main circuit in which the refrigerant circulates.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the cooling operation mode
  • the first heat source side heat exchanger 13a and the first heat exchanger 13a are on the upstream side.
  • the two heat source side heat exchangers 13b are in parallel with each other
  • the third heat source side heat exchanger 13c is in series with the first heat source side heat exchanger 13a and the second heat source side heat exchanger 13b on the downstream side. It is connected by a series refrigerant flow path.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the heating operation mode, the first heat source side heat exchanger 13a and the second heat source side heat The exchanger 13b and the third heat source side heat exchanger 13c are connected in parallel with each other by a parallel refrigerant flow path.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the defrosting operation mode, the first heat source side heat exchanger 13a and the second heat source side
  • the heat exchanger 13b and the third heat source side heat exchanger 13c are connected in parallel with each other by a parallel refrigerant flow path.
  • the air conditioner 100 switches to the series refrigerant flow path when the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the cooling operation mode, and the first When the heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the heating operation mode, they are switched to the parallel refrigerant flow path, and the first heat source side heat exchanger 13a, the first It has a heat exchanger flow path switching device that switches to a parallel refrigerant flow path when the two heat source side heat exchangers 13b and the third heat source side heat exchanger 13c are used as the defrost rainy weather mode.
  • the heat exchanger flow path switching device is a first switchgear 31, a second switchgear 32, a first opening / closing device 33, and a second opening / closing device 34.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the cooling operation mode, they are switched to the series refrigerant flow path and the first It has a heat exchanger flow path switching device that switches to a parallel refrigerant flow path when the heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the heating operation mode. There is.
  • the flow paths of the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c can be switched in series or in parallel between the cooling operation and the heating operation.
  • the series refrigerant flow path is first on the upstream side when the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the cooling operation mode.
  • the heat source side heat exchanger 13a and the second heat source side heat exchanger 13b are in parallel with each other, and the third heat source is relative to the first heat source side heat exchanger 13a and the second heat source side heat exchanger 13b on the downstream side.
  • Side heat exchangers 13c are connected in series.
  • the third heat source side heat exchanger 13c is arranged on the downstream side of the condenser, the volume on the downstream side of the evaporator is small, and evaporation occurs.
  • the liquid refrigerant accumulates on the downstream side of the vessel.
  • the first heat source side heat exchanger 13a is provided with one first header 14a and one first distributor 15a.
  • the second heat source side heat exchanger 13b is provided with one second header 14b and one second distributor 15b.
  • the third heat source side heat exchanger 13c is provided with a single third header 14c and a single fourth header 14d.
  • each of the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c is provided with a total of two headers or distributors.
  • the cost can be suppressed and the installation space can be narrowed as compared with the conventional configuration in which two or more headers and distributors are provided in one heat source side heat exchanger.
  • the first opening degree adjusting device 33 and the second opening degree adjusting device 34 are throttle devices capable of adjusting the flow rate by changing the opening degree.
  • the heat exchanger flow path switching device changes the opening degree of each of the first opening degree adjusting device 33 and the second opening degree adjusting device 34 to the first heat source side. The amount of refrigerant flowing into each of the heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c is adjusted.
  • the first heat source side heat exchanger 13a when the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger 13c are used as the heating operation mode, the first heat source side heat exchanger 13a
  • the amount of refrigerant can be optimally distributed to the second heat source side heat exchanger 13b and the third heat source side heat exchanger 13c.
  • the total heat transfer area of the heat transfer area of the first heat source side heat exchanger 13a and the heat transfer area of the second heat source side heat exchanger 13b is the third heat source side heat exchanger 13c. It is formed so as to be larger than the heat transfer area of.
  • the third heat source side heat exchanger 13c is arranged on the downstream side of the evaporator, and the volume on the downstream side of the evaporator is large. It is small, and the refrigerant that collects liquid refrigerant on the downstream side of the evaporator can be suppressed from falling asleep, and the refrigerant can be circulated well.
  • the first heat source side heat exchanger 13a is arranged independently.
  • a part of the second heat source side heat exchanger 13b is integrally formed with the third heat source side heat exchanger 13c by sharing fins which are heat exchanger components.
  • the remaining part other than a part of the second heat source side heat exchanger 13b is configured independently of the third heat source side heat exchanger 13c.
  • the first heat source side heat exchanger 13a, the second heat source side heat exchanger 13b, and the third heat source side heat exchanger are used as opposed to the case where the independent first heat source side heat exchanger 13a also shares the fins.
  • the connection pipe which is the refrigerant pipe 3 can be simplified, and the air conditioner 100 can be miniaturized.
  • the heat transfer tube which is a component of the heat exchanger is a flat tube. ..
  • the compressor 10 of the first embodiment has been described by taking the case of using a low-pressure shell type compressor as an example. However, for example, the same effect can be obtained by using a high-pressure shell type compressor.
  • the heat source side heat exchanger and the load side heat exchanger are often equipped with a blower such as a fan that promotes the condensation or evaporation of the refrigerant by blowing air, but the present invention is not limited to this. ..
  • a blower such as a fan that promotes the condensation or evaporation of the refrigerant by blowing air
  • the present invention is not limited to this. ..
  • a panel heater using radiation can also be used.
  • a water-cooled type heat exchanger that exchanges heat with a liquid such as water or antifreeze can be used. Any heat exchanger can be used as long as it can dissipate heat or absorb heat from the refrigerant.
  • a water-cooled type heat exchanger for example, a water-refrigerant heat exchanger such as a plate heat exchanger or a double-tube heat exchanger may be installed and used.
  • the embodiment is presented as an example and is not intended to limit the scope of the embodiment.
  • the embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the embodiment. These embodiments and variations thereof are included in the scope and gist of the embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

La présente invention concerne un dispositif de climatisation comprenant : un circuit principal dans lequel un compresseur, un dispositif de commutation de canal de fluide frigorigène, un échangeur de chaleur côté charge, un dispositif d'étranglement côté charge, un premier échangeur de chaleur côté source de chaleur, un deuxième échangeur de chaleur côté source de chaleur et un troisième échangeur de chaleur côté source de chaleur sont reliés par une tuyauterie et dans lesquels circule un fluide frigorigène ; un dispositif de commutation de canal d'échangeur de chaleur servant à commuter un canal de fluide frigorigène des premier, deuxième et troisième échangeurs de chaleur côté source de chaleur ; et un dispositif de commande destiné à commander le dispositif de commutation de canal d'échangeur de chaleur. Le dispositif de commande commande le dispositif de commutation de canal d'échangeur de chaleur pour commuter le canal de fluide frigorigène du premier, deuxième et troisième échangeurs de chaleur côté source de chaleur vers un canal de fluide frigorigène parallèle lorsque les premier, deuxième et troisième échangeurs de chaleur côté source de chaleur sont utilisés dans un mode de fonctionnement de dégivrage. Le canal de fluide frigorigène parallèle est un canal de fluide frigorigène dans lequel les premier, deuxième et troisième échangeurs de chaleur côté source de chaleur sont branchés en parallèle les uns aux autres.
PCT/JP2019/028595 2019-07-22 2019-07-22 Dispositif de climatisation WO2021014520A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201980098517.XA CN114127493B (zh) 2019-07-22 2019-07-22 空调装置
PCT/JP2019/028595 WO2021014520A1 (fr) 2019-07-22 2019-07-22 Dispositif de climatisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/028595 WO2021014520A1 (fr) 2019-07-22 2019-07-22 Dispositif de climatisation

Publications (1)

Publication Number Publication Date
WO2021014520A1 true WO2021014520A1 (fr) 2021-01-28

Family

ID=74192982

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/028595 WO2021014520A1 (fr) 2019-07-22 2019-07-22 Dispositif de climatisation

Country Status (2)

Country Link
CN (1) CN114127493B (fr)
WO (1) WO2021014520A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117948735A (zh) * 2022-10-18 2024-04-30 青岛海尔空调电子有限公司 换热器、换热器的控制方法及空调器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0420764A (ja) * 1990-05-16 1992-01-24 Hitachi Ltd 空気調和機
WO2018047416A1 (fr) * 2016-09-12 2018-03-15 三菱電機株式会社 Climatiseur
WO2018047331A1 (fr) * 2016-09-12 2018-03-15 三菱電機株式会社 Dispositif de climatisation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5237833A (en) * 1991-01-10 1993-08-24 Mitsubishi Denki Kabushiki Kaisha Air-conditioning system
CN101280979A (zh) * 2008-05-26 2008-10-08 刘雄 空调热泵装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0420764A (ja) * 1990-05-16 1992-01-24 Hitachi Ltd 空気調和機
WO2018047416A1 (fr) * 2016-09-12 2018-03-15 三菱電機株式会社 Climatiseur
WO2018047331A1 (fr) * 2016-09-12 2018-03-15 三菱電機株式会社 Dispositif de climatisation

Also Published As

Publication number Publication date
CN114127493B (zh) 2023-09-08
CN114127493A (zh) 2022-03-01

Similar Documents

Publication Publication Date Title
JP6685409B2 (ja) 空気調和装置
JP6644154B2 (ja) 空気調和装置
JP4803199B2 (ja) 冷凍サイクル装置
US20230184471A1 (en) Air conditioning system with capacity control and controlled hot water generation
US7984621B2 (en) Air conditioning system for communication equipment and controlling method thereof
WO2013145006A1 (fr) Dispositif de conditionnement d'air
JPWO2018002983A1 (ja) 冷凍サイクル装置
JP6647406B2 (ja) 冷凍サイクル装置
KR101737365B1 (ko) 공기조화기
JP6479181B2 (ja) 空気調和装置
JPWO2012085965A1 (ja) 空気調和機
WO2020174618A1 (fr) Dispositif de climatisation
WO2021014520A1 (fr) Dispositif de climatisation
US20210063092A1 (en) Heat transfer circuit with flow dependent heat exchanger
US11879677B2 (en) Air-conditioning apparatus
JP7258212B2 (ja) 空気調和装置
KR20110085393A (ko) 공기 조화기
WO2023170743A1 (fr) Dispositif à cycle frigorifique
US20240167735A1 (en) Heat source unit and air conditioner
KR100188994B1 (ko) 다실 냉난방기의 냉매제어장치
JPH09310931A (ja) 空気調和機
KR20180026986A (ko) 멀티형 공기조화 시스템
JPWO2013145006A1 (ja) 空気調和装置
KR980010241A (ko) 다실 냉난방기의 열교환용량 보정 냉각싸이클
KR20050074119A (ko) 공기조화기

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19938462

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19938462

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP