CN111023369A - Refrigerant circulation system and air conditioner - Google Patents

Refrigerant circulation system and air conditioner Download PDF

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Publication number
CN111023369A
CN111023369A CN201911386676.8A CN201911386676A CN111023369A CN 111023369 A CN111023369 A CN 111023369A CN 201911386676 A CN201911386676 A CN 201911386676A CN 111023369 A CN111023369 A CN 111023369A
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CN
China
Prior art keywords
port
refrigerant
communicated
outdoor unit
compressor
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Withdrawn
Application number
CN201911386676.8A
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Chinese (zh)
Inventor
熊国辉
黄定英
周晖
白亚飞
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Songz Automobile Air Conditioning Co Ltd
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Songz Automobile Air Conditioning Co Ltd
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Priority to CN201911386676.8A priority Critical patent/CN111023369A/en
Publication of CN111023369A publication Critical patent/CN111023369A/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0003—Exclusively-fluid systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention belongs to the technical field of air conditioners, and particularly discloses a refrigerant circulating system and an air conditioner. Wherein, refrigerant circulation system includes: the air conditioner comprises a compressor, a first four-way reversing valve, a second four-way reversing valve, an indoor unit, an outdoor unit, an electronic expansion valve and a gas-liquid separator, wherein the first four-way reversing valve is provided with an A1 port, a B1 port, a C1 port and a D1 port, and the second four-way reversing valve is provided with an A2 port, a B2 port, a C2 port and a D2 port; the A1 port is communicated with the outlet of the compressor, the B1 port is communicated with the A2 port, the C1 port is communicated with the inlet of the compressor through a gas-liquid separator, and the D1 port is communicated with the M1 port of the indoor unit; the port D2 communicates with the port L1 of the outdoor unit, the port B2 communicates with the port L2 of the outdoor unit, and the port C2 communicates with the port M2 of the indoor unit through an electronic expansion valve. The air conditioner comprises the refrigerant circulating system. The refrigerant circulating system and the air conditioner disclosed by the invention have the advantages that the defrosting efficiency and the defrosting effect of the refrigerant circulating system and the air conditioner are improved.

Description

Refrigerant circulation system and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant circulating system and an air conditioner.
Background
Along with the development of the trend of energy conservation and environmental protection, the use of the heat pump air conditioner of the electric automobile is gradually increased, and when the heat pump air conditioner operates in a low-temperature and high-humidity environment in winter, the surface of an outdoor heat exchanger can be frosted, so that the heat exchange efficiency of the heat exchanger is reduced, the air flow resistance is increased, the heat supply capacity of a heat pump system is reduced, and the unit can stop operating in severe cases.
The reverse cycle defrosting adopts a four-way valve to switch the flow direction of a refrigerant, and the refrigerant enters and exits the outdoor heat exchanger during defrosting is opposite to that during heating. In the heating mode, the refrigerant enters from the bottom to the top of the outdoor heat exchanger to cause that the average temperature at the bottom of the outdoor heat exchanger is lower than the average temperature at the bottom, and a bottom frost layer is thicker than a top frost layer when the outdoor heat exchanger frosts; and because the temperature of the bottom of the outdoor heat exchanger is lower during defrosting, water drops after the top frost layer is melted are difficult to be effectively evaporated at the bottom due to the fact that the water drops drop to the bottom of the heat exchanger under the action of gravity, and accordingly defrosting water is retained at the bottom, the defrosting water existing on the surface of the outdoor heat exchanger after defrosting is quitted cannot be timely removed, the defrosting speed is increased, and the heating effect of the heat pump is affected. If make the defrosting more thorough, will prolong the defrosting time certainly, and then make indoor temperature decay serious, influence personnel's comfort level.
Therefore, there is a need for an air conditioning system that shortens the defrosting time and improves the defrosting efficiency and effectiveness.
Disclosure of Invention
An object of the present invention is to provide a refrigerant cycle system, which improves the defrosting efficiency and effect of the refrigerant cycle system and shortens the defrosting time.
Another object of the present invention is to provide an air conditioner, which can improve the defrosting efficiency and effect of the air conditioner, shorten the defrosting time of the air conditioner, and improve the operation efficiency of the air conditioner.
In order to achieve the purpose, the invention adopts the following technical scheme:
a refrigerant circulating system comprises a compressor, a first four-way reversing valve, a second four-way reversing valve, an indoor unit, an outdoor unit, an electronic expansion valve and a gas-liquid separator, wherein the first four-way reversing valve is provided with an A1 port, a B1 port, a C1 port and a D1 port, and the second four-way reversing valve is provided with an A2 port, a B2 port, a C2 port and a D2 port;
the A1 port is communicated with an outlet of the compressor, the B1 port is communicated with the A2 port, the C1 port is communicated with an inlet of the compressor through the gas-liquid separator, and the D1 port is communicated with an L1 port of the indoor unit;
the port B2 is communicated with a port L2 of the outdoor unit, the port C2 is communicated with a port L2 of the indoor unit through the electronic expansion valve, and the port D2 is communicated with a port L1 of the outdoor unit;
when the refrigerant circulating system is in a heating mode, the port A2 is communicated with the port D2, the port B2 is communicated with the port C2, the port B1 is communicated with the port C1, and the port A1 is communicated with the port D1;
when the refrigerant circulation system is in a defrosting mode, the port C1 is communicated with the port D1, the port B1 is communicated with the port A1, the port A2 is communicated with the port B2, and the port C2 is communicated with the port D2.
As a preferable technical solution of the refrigerant circulation system, the L1 port is located at the top of the outdoor unit, and the L2 port is located at the bottom of the outdoor unit.
And a drying device and/or a filtering device are/is arranged on a communication pipeline between the port C2 and the electronic expansion valve.
As a preferable technical scheme of the refrigerant circulation system, a liquid viewing mirror is arranged on a communication pipeline between the port C2 and the electronic expansion valve.
As a preferable technical solution of the refrigerant cycle system, a first temperature sensor is provided on a communication pipe between the B2 port and the L2 port of the outdoor unit, and/or a second temperature sensor is provided on a communication pipe between the inlet of the gas-liquid separator and the C1 port, and/or a third temperature sensor is provided between the L1 port of the outdoor unit and the D2 port.
As a preferable technical scheme of the refrigerant circulating system, a first valve core is arranged on a communication pipeline between the outlet of the compressor and the port a1, and/or a second valve core is arranged on a communication pipeline between the port C1 and the inlet of the gas-liquid separator.
As a preferable technical scheme of the refrigerant circulation system, a pressure relief valve is arranged on a communication pipeline between the outlet of the compressor and the port a 1.
As a preferable technical solution of the refrigerant circulation system, a first pressure detection device is disposed on a communication pipeline between the outlet of the compressor and the port a1, and/or a second pressure detection device is disposed on a communication pipeline between the port C1 and the inlet of the gas-liquid separator.
As a preferred technical solution of the refrigerant circulation system, the indoor unit includes two indoor heat exchangers arranged in parallel, and/or the outdoor unit includes two outdoor heat exchangers arranged in parallel.
An air conditioner comprises the refrigerant circulating system.
The invention has the beneficial effects that:
the refrigerant circulating system provided by the invention switches the refrigerating mode, the heating mode and the defrosting mode by arranging the first four-way reversing valve and the second four-way reversing valve, so that the refrigerant flows into the L2 port of the outdoor unit and flows out of the L1 port of the outdoor unit in the heating mode and the defrosting mode of the refrigerant circulating system, the flow direction of the refrigerant in the outdoor unit in the heating mode and the flow direction of the refrigerant in the defrosting mode can be ensured to be the same, when the frost layer thickness is inconsistent when the outdoor unit frosts due to the gradual rise of the temperature of the refrigerant in the process of flowing from the L2 port to the L1 port in the heating mode, the flow direction of the refrigerant in the outdoor unit in the defrosting mode is consistent with that in the heat exchange process, and the temperature of the refrigerant flowing from the L2 port to the L1 port in the defrosting process is gradually reduced, so that the frost layer can be melted by the heat of the refrigerant with higher temperature during defrosting, improve defrosting efficiency and defrosting effect, shorten defrosting time.
According to the refrigerant circulating system provided by the invention, the port L2 is arranged at the bottom of the outdoor unit, and the port L1 is arranged at the top of the outdoor unit, so that the temperature of the refrigerant at the bottom of the outdoor unit is higher than that at the top of the outdoor unit in a defrosting mode, and even if defrosting water melted on a top frost layer drips to the bottom under the action of gravity, the defrosting water at the bottom can be subjected to heat exchange and evaporation by the refrigerant with higher temperature, so that the defrosting water generated in the defrosting process can be timely removed, the defrosting water remained on the surface of the outdoor unit can be prevented from being frozen again, and the defrosting effect is further improved.
The air conditioner provided by the invention improves the defrosting efficiency and effect of the air conditioner and improves the operation efficiency of the air conditioner by adopting the refrigerant circulating system.
Drawings
Fig. 1 is a schematic structural diagram of a refrigerant circulation system in a cooling state according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a refrigerant circulation system in a heating state according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a refrigerant circulation system in a defrosting state according to an embodiment of the present invention.
The figures are labeled as follows:
1-a first four-way reversing valve; 2-a second four-way reversing valve; 3-a compressor; 4-a first valve core; 5-a pressure relief valve; 6-first pressure detection means; 7-outdoor unit; 71-outdoor heat exchanger; 8-indoor units; 81-indoor heat exchanger; 9-a first temperature sensor; 10-drying the filter; 11-liquid sight glass; 12-an electronic expansion valve; 13-a second temperature sensor; 14-a second pressure detection device; 15-second valve core; 16-a gas-liquid separator; 18-third temperature sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Fig. 1 is a schematic structural diagram of a refrigerant circulation system in a cooling state according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of the refrigerant circulation system in a heating state according to the embodiment of the present invention, and fig. 3 is a schematic structural diagram of the refrigerant circulation system in a defrosting state according to the embodiment of the present invention, as shown in fig. 1 to fig. 3, the embodiment of the present invention provides a refrigerant circulation system, which is applied to an air conditioner, and is configured to implement switching of cooling, heating, and defrosting modes of the air conditioner, adjust an ambient temperature, and improve comfort of an air conditioner user.
Specifically, the refrigerant circulation system provided in this embodiment includes a compressor 3, a first four-way reversing valve 1, a second four-way reversing valve 2, an indoor unit 8, an outdoor unit 7, an electronic expansion valve 12, and a gas-liquid separator 16. The first four-way selector valve 1 has ports a1, B1, C1 and D1, and the second four-way selector valve 2 has ports a2, B2, C2 and D2. Wherein, the port A1 is communicated with the outlet of the compressor 3, the port B1 is communicated with the port A2, the port C1 is communicated with the inlet of the compressor 3 through the gas-liquid separator 16, and the port D1 is communicated with the port M1 of the indoor unit 8; the B2 port communicates with the L2 port of the outdoor unit 7, the C2 port communicates with the M2 port of the indoor unit 8 via the electronic expansion valve 12, and the D2 port communicates with the L1 port of the outdoor unit 7.
The refrigerant circulation system that this embodiment provided realizes refrigerant circulation system refrigeration, heats and the switching of defrosting mode through the switching-over of first four-way reversing valve 1 and second four-way reversing valve 2:
as shown in fig. 1, when the refrigerant cycle is in the cooling mode, the port a1 is connected to the port B1, the port D1 is connected to the port C1, the port a2 is connected to the port D2, and the port B2 is connected to the port C2: high-temperature high-pressure superheated refrigerant vapor discharged from an outlet of the compressor 3 sequentially passes through an A1 port and a B1 port of the first four-way reversing valve 1 and an A2 port and a D2 port of the second four-way reversing valve 2, then enters the outdoor unit 7 from an L1 port of the outdoor unit 7, is condensed in the outdoor unit 7 to release heat, then is changed into middle-temperature high-pressure subcooled refrigerant, flows out from an L2 port of the outdoor unit 7, flows back to the second four-way reversing valve 2 from an outdoor inlet L2 port, flows out from a C2 port, is throttled and depressurized by the electronic expansion valve 12 to be changed into low-temperature low-pressure two-phase refrigerant, enters the indoor unit 8 from an indoor unit 8M2 port to evaporate and absorb heat of indoor air, is changed into middle-temperature low-pressure superheated refrigerant vapor, flows out from an M1 port of the indoor unit 8, flows into the gas-liquid separator 16 to perform gas-liquid separation after passing through a D1 port and a C1 port of the first, the gaseous refrigerant after gas-liquid separation flows back to the compressor 3 to complete the whole refrigeration cycle.
As shown in fig. 2, when the refrigerant cycle system is in the heating mode, the port a1 is communicated with the port D1, the port B1 is communicated with the port C1, the port a2 is communicated with the port D2, and the port B2 is communicated with the port C2: high-temperature high-pressure superheated refrigerant vapor discharged from an outlet of the compressor 3 enters the indoor unit 8 from an opening M1 of the indoor unit 8 after passing through openings A1 and D1 of the first four-way selector valve 1, is condensed and released into medium-temperature high-pressure subcooled refrigerant after heat is condensed and released in the indoor unit 8 and flows out from an opening M2 of the indoor unit 8, is throttled and depressurized by the electronic expansion valve 12 to become low-temperature low-pressure two-phase refrigerant, passes through an opening C2 and an opening B2 of the second four-way selector valve 2 and then enters the outdoor unit 7 from an opening L2 of the outdoor unit 7, evaporates and absorbs heat in the outdoor unit 7 to become medium-temperature low-pressure superheated refrigerant vapor, flows out from an opening L1 of the outdoor unit 7, and flows into the gas-liquid separator 16 after sequentially passing through an opening D2 and an opening A2 of the second four-way selector valve 2 and openings B1 and a opening C1 of the first four-way selector valve 1, the gaseous refrigerant after gas-liquid separation flows back to the compressor 3 to complete the whole heating cycle.
As shown in fig. 3, when the refrigerant cycle system is in the defrosting mode, the port a1 is communicated with the port B1, the port C1 is communicated with the port D1, the port a2 is communicated with the port B2, and the port C2 is communicated with the port D2: high-temperature high-pressure superheated refrigerant vapor discharged from an outlet of the compressor 3 sequentially passes through an A1 port and a B1 port of the first four-way reversing valve 1 and an A2 port and a B2 port of the second four-way reversing valve 2 and then enters the outdoor unit 7 from an L2 port of the outdoor unit 7, the high-temperature high-pressure superheated refrigerant is condensed and releases heat in the outdoor unit 7, then is changed into middle-temperature high-pressure subcooled refrigerant and flows out from an L1 port of the outdoor unit 7, the subcooled refrigerant passes through a C2 port and a D2 port of the second four-way reversing valve 2 and then enters the electronic expansion valve 12 for throttling and pressure reduction to form low-temperature two-phase refrigerant, the two-phase refrigerant flows into the indoor unit 8 from an M2 port of the indoor unit 8 for evaporation and heat absorption and then is changed into middle-temperature low-pressure superheated refrigerant vapor and then flows out from an M1 port of the indoor unit 8, the superheated refrigerant vapor passes through a D1, the gaseous refrigerant after gas-liquid separation flows back to the compressor 3 to complete the whole defrosting cycle.
In the refrigerant cycle system provided by the embodiment, the first four-way reversing valve 1 and the second four-way reversing valve 2 are arranged to switch the cooling mode, the heating mode and the defrosting mode, so that the refrigerant flows in from the port L2 of the outdoor unit 7 and flows out from the port L1 of the outdoor unit 7 in the heating mode and the defrosting mode of the refrigerant cycle system, the flow direction of the refrigerant in the outdoor unit 7 in the heating mode and the flow direction of the refrigerant in the defrosting mode are the same, when the frost layer thickness of the outdoor unit 7 is inconsistent due to the gradual rise of the temperature of the refrigerant in the process of flowing from the port L2 to the port L1 in the heating mode, the flow direction of the refrigerant in the outdoor unit 7 in the defrosting mode is consistent with the heat exchange, and the temperature of the refrigerant flowing from the port L2 to the port L1 in the defrosting mode is gradually reduced, so that the thicker frost layer can be melted by the heat of the refrigerant with higher temperature in the defrosting mode, improve defrosting efficiency and defrosting effect, shorten defrosting time.
In this embodiment, the L1 port and the L2 port of the outdoor unit 7 may be disposed on the same side of the outdoor unit 7, for example, disposed on the bottom and the top of the same end or disposed on the left and right sides of the same end, the L1 port and the L2 port may also be disposed on different sides of the outdoor unit 7, the positions of the L1 port and the L2 port of the outdoor unit 7 in this embodiment are limited as long as the refrigerant can enter from the L1 port (the L2 port enters) and flow out from the L2 port (the L1 port flows out) after heat exchange inside the outdoor unit 7, and the L1 port and the L2 port are only the ports through which the refrigerant flows in or out.
Preferably, the port L1 is located at the top of the outdoor unit 7, the port L2 is located at the bottom of the outdoor unit 7, and the port L2 is located at the bottom of the outdoor unit and the port L1 is located at the top of the outdoor unit, so that in the defrosting mode, the temperature of the refrigerant at the bottom of the outdoor unit is higher than the temperature at the top of the outdoor unit, and therefore, even if the defrosting water melted on the top frost layer drips to the bottom under the action of gravity, the defrosting water at the bottom can be evaporated by the heat exchange of the refrigerant with higher temperature, and therefore, the defrosting water generated in the defrosting process can be timely removed, re-icing caused by the residual defrosting water on the surface of the outdoor unit can be avoided, and the defrosting effect is further improved. It is understood that the top and the bottom may be the top and the bottom of the same side of the outdoor unit 7, or the top or the bottom of different sides of the outdoor unit 7.
In this embodiment, the M1 port and the M2 port of the indoor unit 8 may be disposed on the same side of the indoor unit 8, for example, disposed on the bottom and the top of the same end or disposed on the left and right sides of the same end, the M1 port and the M2 port may also be disposed on different sides of the indoor unit 8, and the positions of the M1 port and the M2 port of the outdoor unit 7 in this embodiment are limited as long as the refrigerant can enter from the M1 port (enter from the M2 port), and after heat exchange inside the indoor unit 8, the refrigerant flows out from the M2 port (flow out from the M1 port).
In this embodiment, the M1 port and the M2 port of the indoor unit group 8 are respectively located at two ends of the indoor unit group, that is, the M1 port is located at the L1 port M1 of the indoor unit group 8, and the M2 port is located at the L2 port M2 of the indoor unit group 8. In other embodiments, the ports M1 and M2 may be located at the same end of the indoor unit 8, such as for a U-shaped heat exchanger where the inlet and outlet of the heat exchange medium are located at the same end.
Preferably, the indoor unit 8 includes two indoor heat exchangers 81 arranged in parallel, and/or the outdoor unit 7 includes two outdoor heat exchangers 71 arranged in parallel, and by providing the two indoor heat exchangers 81 and/or the two outdoor heat exchangers 71, while the heat exchange area of the refrigerant circulation system at the indoor unit 8 and/or the outdoor unit 7 is increased, the manufacturing process of the indoor unit 8 and/or the outdoor unit 7 is simplified, the manufacturing cost is reduced, the layout of the indoor heat exchangers 81 and/or the outdoor heat exchangers 71 in actual application scenes is facilitated, and the flexibility in placement of the indoor heat exchangers 81 and/or the outdoor heat exchangers 71 is improved. In this embodiment, the indoor heat exchanger 81 and the outdoor heat exchanger 71 are common devices in an air conditioner, and they may be set by referring to the structure and model in the prior art, which is not described in detail in this embodiment.
Preferably, in order to monitor the operation of the refrigerant circulation system, a first temperature sensor 9 is disposed on a communication pipe between the port L2 of the outdoor unit 7 and the port B2 of the second four-way selector valve 2, a second temperature sensor 13 is disposed on a communication pipe between the port C1 of the first four-way selector valve 1 and the inlet of the gas-liquid separator 16, and/or a third temperature sensor 18 is disposed between the port L1 of the outdoor unit 7 and the port D2. The first temperature sensor 9 is used for detecting the temperature of the refrigerant at the L2 port of the outdoor unit 7, so as to determine whether the defrosting mode needs to be started, and the third temperature sensor 18 is used for detecting the temperature of the refrigerant at the L1 port of the outdoor unit 7, so as to determine whether the defrosting mode needs to be closed, that is, the first temperature sensor 9 and the third temperature sensor 18 are matched, so that the timing of opening and closing the defrosting mode can be detected and controlled more accurately. The second temperature sensor 13 detects the temperature of the refrigerant flowing back to the gas-liquid separator 16, and controls the operation of the compressor 3 and the flow rate of the refrigerant.
Preferably, a first valve core 4 is disposed on a communication pipeline between an outlet of the compressor 3 and the port a1, and/or a second valve core 15 is disposed on a communication pipeline between the port C1 and an inlet of the gas-liquid separator 16, so as to fill refrigerant into a circulation pipeline of the refrigerant circulation system, and facilitate the maintenance of the pipeline of the refrigerant circulation system.
More preferably, in order to monitor the flowing pressure of the refrigerant in the refrigerant cycle system, a first pressure detecting device 6 is disposed on a communication pipeline between the port a1 and the outlet of the compressor 3, and/or a second pressure detecting device 14 is disposed between the port C1 and the gas-liquid separator 16, wherein the first pressure detecting device 6 is used for detecting the pressure of the high-temperature high-pressure superheated refrigerant steam flowing out from the outlet of the compressor 3, and the second pressure detecting device 14 is used for detecting the pressure value of the refrigerant flowing into the gas-liquid separator 16, so that the operation of the refrigerant cycle system can be adjusted according to the pressure value detected by the first pressure detecting device 6 and/or the second pressure detecting device 14, and the operation of the whole air conditioner can be controlled.
More preferably, in this embodiment, a pressure relief valve 5 is disposed between the port a1 and the outlet of the compressor 3, and is configured to perform pressure relief adjustment on the pressure of the communication pipeline in the refrigerant circulation system, so as to prevent the pipeline pressure from being too high after the second pressure detection device 14 fails to measure, and improve protection of the refrigerant circulation system.
In this embodiment, the first pressure detection device 6 and the second pressure detection device 14 are both pressure sensors, which have high detection accuracy and facilitate the control of the refrigerant circulation pipeline, and in other embodiments, the first pressure detection device 6 and the second pressure detection device 14 may also be pressure switches or other devices capable of monitoring the pipeline pressure.
Furthermore, a filtering device and/or a drying device are/is arranged between the C2 port and the electronic expansion communication pipeline, and the filtering device is used for filtering copper scraps, welding slag, dust and other impurities carried by the refrigerant in the refrigerant circulation system and preventing the communication pipeline in the refrigerant circulation system from being blocked; the drying device is used for drying the moisture in the communication pipeline, so that the purity of the refrigerant is improved, the pipeline is prevented from being frozen and blocked, and the operation reliability of the refrigerant is improved. Further, in the present embodiment, the filter device and the drying device are integrally provided as the filter-drier 10, and the filter-drier 10 is a device that can realize both the drying function and the filtering function, and can reduce the number of components in the refrigerant circulation system and reduce the cost. In other embodiments, the drying device and the filtering device can also be provided as different devices, respectively. Since the drying device, the filtering device and the filter-drier 10 are conventional devices in the art, mature devices in the prior art can be adopted, and the structure thereof is not described in detail in this embodiment.
Further, for detecting the water content of the refrigerant in the refrigerant circulating system, a communicating pipe between the port C2 and the electronic expansion valve 12 is provided with a liquid viewing mirror 11, the liquid viewing mirror 11 can monitor the refrigerant filling amount in the refrigerant circulating system on the one hand, and can detect the water content in the refrigerant on the other hand, so that the state of the refrigerant can be detected, the refrigerant is dried, added and subtracted or purified in time, and the heat exchange efficiency of the refrigerant is improved. More preferably, in the present embodiment, a sight glass 11 is disposed between the dry filter 10 and the electronic expansion valve 12 to monitor the liquid refrigerant after being dried and filtered.
The embodiment also provides an air conditioner comprising the refrigerant circulating system.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. The refrigerant circulating system is characterized by comprising a compressor (3), a first four-way reversing valve (1), a second four-way reversing valve (2), an indoor unit (8), an outdoor unit (7), an electronic expansion valve (12) and a gas-liquid separator (16), wherein the first four-way reversing valve (1) is provided with an A1 port, a B1 port, a C1 port and a D1 port, and the second four-way reversing valve (2) is provided with an A2 port, a B2 port, a C2 port and a D2 port;
the A1 port is communicated with an outlet of the compressor (3), the B1 port is communicated with the A2 port, the C1 port is communicated with an inlet of the compressor (3) through the gas-liquid separator (16), and the D1 port is communicated with an M1 port of the indoor unit (8);
the D2 port is communicated with an L1 port of the outdoor unit (7), the B2 port is communicated with an L2 port of the outdoor unit (7), and the C2 port is communicated with an M2 port of the indoor unit (8) through the electronic expansion valve (12);
when the refrigerant circulating system is in a heating mode, the port A2 is communicated with the port D2, the port B2 is communicated with the port C2, the port B1 is communicated with the port C1, and the port A1 is communicated with the port D1;
when the refrigerant circulation system is in a defrosting mode, the port C1 is communicated with the port D1, the port B1 is communicated with the port A1, the port A2 is communicated with the port B2, and the port C2 is communicated with the port D2.
2. The refrigerant circulation system as claimed in claim 1, wherein the L1 port is located at a top of the outdoor unit (7), and the L2 port is located at a bottom of the outdoor unit (7).
3. The refrigerant circulation system as claimed in claim 1, wherein a drying device and/or a filtering device is disposed on a communication pipe between the port C2 and the electronic expansion valve (12).
4. The refrigerant circulation system as claimed in claim 1, wherein a liquid viewing mirror (11) is disposed on a communication line between the port C2 and the electronic expansion valve (12).
5. The refrigerant cycle system as claimed in claim 1, wherein a first temperature sensor (9) is provided in a communication line between the port B2 and the port L2 of the outdoor unit (7), a second temperature sensor (13) is provided in a communication line between the inlet of the gas-liquid separator (16) and the port C1, and/or a third temperature sensor (18) is provided between the port L1 and the port D2 of the outdoor unit (7).
6. The refrigerant cycle system as claimed in claim 1, wherein a first valve core (4) is disposed on a communication pipeline between an outlet of the compressor (3) and the port a1, and/or a second valve core (15) is disposed on a communication pipeline between the port C1 and an inlet of the gas-liquid separator (16).
7. The refrigerant circulation system as claimed in claim 1, wherein a pressure relief valve (5) is provided on a communication line between an outlet of the compressor (3) and the port a 1.
8. The refrigerant cycle system as claimed in claim 1, wherein a first pressure detecting device (6) is provided on a communication pipe between the outlet of the compressor (3) and the port a1, and/or a second pressure detecting device (14) is provided on a communication pipe between the port C1 and the inlet of the gas-liquid separator (16).
9. Refrigerant cycle system according to claim 1, wherein the indoor unit (8) comprises two indoor heat exchangers (81) arranged in parallel and/or the outdoor unit (7) comprises two outdoor heat exchangers (71) arranged in parallel.
10. An air conditioner, characterized by comprising the refrigerant circulation system as claimed in any one of claims 1 to 9.
CN201911386676.8A 2019-12-28 2019-12-28 Refrigerant circulation system and air conditioner Withdrawn CN111023369A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201911386676.8A CN111023369A (en) 2019-12-28 2019-12-28 Refrigerant circulation system and air conditioner

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104990321A (en) * 2015-06-30 2015-10-21 广东美的制冷设备有限公司 Air conditioner and defrosting method thereof
WO2017216861A1 (en) * 2016-06-14 2017-12-21 三菱電機株式会社 Air conditioner
CN209415818U (en) * 2018-11-12 2019-09-20 珠海格力电器股份有限公司 Air conditioning system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104990321A (en) * 2015-06-30 2015-10-21 广东美的制冷设备有限公司 Air conditioner and defrosting method thereof
WO2017216861A1 (en) * 2016-06-14 2017-12-21 三菱電機株式会社 Air conditioner
CN209415818U (en) * 2018-11-12 2019-09-20 珠海格力电器股份有限公司 Air conditioning system

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Application publication date: 20200417