CN111121156B - Multi-connected air conditioner - Google Patents

Multi-connected air conditioner Download PDF

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Publication number
CN111121156B
CN111121156B CN202010065150.6A CN202010065150A CN111121156B CN 111121156 B CN111121156 B CN 111121156B CN 202010065150 A CN202010065150 A CN 202010065150A CN 111121156 B CN111121156 B CN 111121156B
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interface
valve
heat exchanger
pressure
compressor
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CN111121156A (en
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宋旭彤
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • F24F5/0007—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 cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion 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
    • 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
    • F25B49/022—Compressor control arrangements

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

Abstract

The invention relates to a multi-connected air conditioner, which automatically recovers the refrigerant at the indoor side into an outdoor heat exchanger, and completely seals the refrigerant in the outdoor heat exchanger through a gas side stop valve and a liquid side stop valve which are arranged in the system.

Description

Multi-connected air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-connected air conditioner.
Background
The multi-connected air conditioner includes at least one outdoor unit and a plurality of indoor units, and when a component on a refrigerant flow path is damaged, a refrigerant needs to be processed.
When the multi-connected air conditioner is used, the parts on the indoor heat exchanger or the indoor unit refrigerant flow path are frequently in failure and need to be replaced. At present, when parts on a refrigerant flow path of an indoor heat exchanger or an indoor unit are replaced, some refrigerants are directly and completely discharged, so that cost and environment pollution are wasted, and when the refrigerants are completely discharged and refilled, the refrigerant quantity in a system can be adjusted repeatedly to reach the proper refrigerant quantity, so that manpower and material resources are wasted; some methods carry out refrigerant recovery through the mode of manual operation stop valve, and the low pressure side pressure is checked in real time to finally close the gas side stop valve and realize manual recovery refrigerant, whether this kind of mode is retrieved totally based on experience judgement refrigerant generally, sometimes because experience is not enough can cause the refrigerant to retrieve the failure.
Disclosure of Invention
The invention provides a multi-connected air conditioner, which solves the technical problem that a refrigerant is difficult to recover when damaged parts on a refrigerant flow path of an indoor unit of the multi-connected air conditioner are replaced in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-connected air conditioner comprises at least one outdoor unit and a plurality of indoor units,
the outdoor unit includes:
at least one compressor comprising a compressor outlet and a compressor inlet;
the four-way valve comprises a first four-way valve interface, a second four-way valve interface, a third four-way valve interface and a fourth four-way valve interface, and the third four-way valve interface is connected with the inlet of the compressor;
the check valve comprises a check valve inlet and a check valve outlet, the check valve inlet is connected with the compressor outlet, and the check valve outlet is connected with a first interface of the four-way valve;
the outdoor heat exchanger comprises an outdoor heat exchanger first interface and an outdoor heat exchanger second interface, and the outdoor heat exchanger first interface is connected with the four-way valve second interface;
the first outdoor electronic expansion valve comprises a first interface and a second interface, and the first interface is connected with the second interface of the outdoor heat exchanger;
the liquid side stop valve is connected with a second interface of the first outdoor electronic expansion valve;
the gas side stop valve is connected with a fourth interface of the four-way valve;
the low-pressure side pressure detection module is used for detecting the low-pressure side pressure;
the indoor unit includes:
the indoor heat exchanger comprises an indoor heat exchanger first interface and an indoor heat exchanger second interface, and the indoor heat exchanger first interface is connected with the gas side stop valve;
the indoor electronic expansion valve comprises an indoor electronic expansion valve first interface and an indoor electronic expansion valve second interface, the indoor electronic expansion valve first interface is connected with the indoor heat exchanger second interface, and the indoor electronic expansion valve second interface is connected with the liquid side stop valve;
the air conditioner comprises a control module, wherein the control module is used for controlling the compressor to run when receiving a refrigerant recovery control signal, and controlling a first interface of a four-way valve of the four-way valve to be connected with a second interface of the four-way valve and a third interface of the four-way valve to be connected with a fourth interface of the four-way valve;
the liquid side stop valve is used for being in a closed state when a refrigerant is recovered;
the control module is used for receiving the low-pressure side pressure, and when the low-pressure side pressure is lower than a first pressure set value, the gas side stop valve is in a closed state.
Compared with the prior art, the technical scheme of the invention has the following technical effects: the multi-connected air conditioner can automatically recycle the refrigerant at the indoor side into the outdoor heat exchanger, and the refrigerant is completely sealed in the outdoor heat exchanger through the gas side stop valve and the liquid side stop valve which are arranged on the system, so that no part is additionally arranged compared with the existing multi-connected air conditioner, the recycling of the refrigerant is completed on the basis of ensuring the constant cost, the maximization of the recycling of the refrigerant can be realized, the automation degree is greatly improved, the success rate of the recycling of the refrigerant is improved, the condition that the refrigerant is directly released into the environment is reduced, the cost of the waste of the refrigerant is reduced, and the environment is protected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a refrigerant cycle of a multi-connected air conditioner including a plurality of outdoor units according to an embodiment of the present invention.
Fig. 2 is a control block diagram of a multi-connected air conditioner according to an embodiment of the invention.
Fig. 3 is a refrigerant recovery flow chart of the multi-connected air conditioner according to the embodiment of the invention.
Fig. 4 is a schematic view illustrating a refrigerant cycle in an outdoor unit of a multi-air conditioner including two compressors according to an embodiment of the present invention.
Reference numerals:
1. a compressor; 2. an oil separator; 3. a one-way valve; 4. a high side pressure detection module; 5. a low-pressure side pressure detection module; 6. a four-way valve; 7. a gas-liquid separator; 8. a first outdoor electronic expansion valve; 9. an outdoor heat exchanger; 10. a bypass solenoid valve; 11. a liquid side stop valve; 12. the air side stop valve 13, the indoor electronic expansion valve 14 and the indoor heat exchanger; 15. a plate heat exchanger; 16. a second outdoor electronic expansion valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. 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 foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The multi-connected air conditioner includes at least one outdoor unit and a plurality of indoor units.
As shown in fig. 1, the present embodiment is described by taking three indoor units and one outdoor unit connected in parallel as an example, but the present invention is not limited to the number of the indoor units and the outdoor units.
The present embodiment is described with reference to an outdoor unit as an example.
The outdoor unit one includes:
a compressor 1, the compressor 1 comprising a compressor outlet and a compressor inlet. Of course, the outdoor unit one may also include two or more compressors 1, and in this case, the compressors 1 are arranged in parallel, as shown in fig. 4.
And the four-way valve 6 comprises a first four-way valve interface, a second four-way valve interface, a third four-way valve interface and a fourth four-way valve interface. The third interface of the four-way valve is connected with the inlet of the compressor through a pipeline, and a low-pressure side pressure detection module 5 and a gas-liquid separator 7 are usually arranged on the pipeline between the third interface of the four-way valve and the inlet of the compressor.
And the check valve 3 comprises a check valve inlet and a check valve outlet. The inlet of the one-way valve is connected with the outlet of the compressor through a pipeline, and the outlet of the one-way valve is connected with the first interface of the four-way valve through a pipeline. An oil separator 2 is typically provided in the line between the inlet of the non-return valve and the outlet of the compressor,
and the outdoor heat exchanger 9 comprises an outdoor heat exchanger first interface and an outdoor heat exchanger second interface. The first interface of the outdoor heat exchanger is connected with the second interface of the four-way valve through a pipeline.
And the outdoor fan is used for radiating heat for the outdoor heat exchanger 9.
The first outdoor electronic expansion valve 8 comprises a first interface of the first outdoor electronic expansion valve and a second interface of the first outdoor electronic expansion valve, and the first interface of the first outdoor electronic expansion valve is connected with the second interface of the outdoor heat exchanger through a pipeline.
And the liquid side stop valve 11 is connected with the second interface of the first outdoor electronic expansion valve through a pipeline.
And the gas side stop valve 12 is connected with a fourth interface of the four-way valve through a pipeline.
And the low-pressure side pressure detection module 5 is used for detecting the low-pressure side pressure. May be located on the pipeline between the third interface of the four-way valve and the gas-liquid separator 7.
And a high-side pressure detection module 4 for detecting the high-side pressure. Can be positioned on a pipeline between the outlet of the one-way valve and the first interface of the four-way valve.
And the bypass electromagnetic valve 10 is used for connecting a third interface of the four-way valve and an outlet of the one-way valve through a pipeline.
The plate type heat exchanger 15 comprises a first heat exchanger interface, a second heat exchanger interface, a third heat exchanger interface and a fourth heat exchanger interface which are communicated with each other, wherein the first heat exchanger interface and the second heat exchanger interface which are communicated with each other are connected to a pipeline between the second heat exchanger interface of the first outdoor electronic expansion valve and the liquid detection stop valve 11, the third heat exchanger interface is connected with the third four-way valve interface through a pipeline, and the fourth heat exchanger interface is connected with the first heat exchanger interface through a pipeline.
The second outdoor electronic expansion valve 16 is positioned on a pipeline between the fourth interface of the heat exchanger and the first interface of the heat exchanger; the second outdoor electronic expansion valve is used for being controlled to adjust the opening degree to be smaller than the set opening degree of the second outdoor electronic expansion valve before the compressor is stopped.
In this embodiment, the first indoor unit is taken as an example for explanation, and the second indoor unit and the third indoor unit are the same as the first indoor unit and are not described again.
Indoor set one includes:
and the indoor heat exchanger 14 comprises an indoor heat exchanger first interface and an indoor heat exchanger second interface. The first interface of the indoor heat exchanger is connected with the gas side stop valve 12 through a pipeline.
The indoor electronic expansion valve 13 includes an indoor electronic expansion valve first interface and an indoor electronic expansion valve second interface. The first interface of the indoor electronic expansion valve is connected with the second interface of the indoor heat exchanger through a pipeline, and the second interface of the indoor electronic expansion valve is connected with the liquid side stop valve 11 through a pipeline.
As shown in fig. 2, the air conditioner includes a control module for controlling the air conditioner to perform refrigerant recovery when receiving a refrigerant recovery control signal, and operates in a cooling mode, but removes a temperature limit.
In this embodiment, the control module is located in the outdoor unit, and the outdoor unit is provided with a button for generating a refrigerant recovery control signal. And generating a refrigerant recovery control signal through a key. Of course, the control module may also receive a refrigerant recovery control signal sent remotely, for example, the refrigerant recovery control signal sent by the intelligent terminal or the cloud platform.
When the outdoor units are multiple, the outdoor units comprise a host machine and slave machines, the control module of the embodiment is a control module of the host machine, the control module is communicated with the indoor unit through the communication module, is communicated with other outdoor units through the communication module, receives parameter information sent by the indoor unit and other outdoor units and sends control instructions to the indoor unit and other outdoor units.
The specific process of refrigerant recovery is as follows:
the control module receives a refrigerant recovery control signal.
The control module controls all compressors to run, controls first four-way valve interfaces of all four-way valves to be connected with second four-way valve interfaces, controls third four-way valve interfaces to be connected with fourth four-way valve interfaces, and controls all indoor electronic expansion valves and the first outdoor electronic expansion valve to be opened. The refrigerant flows in the flow direction of the cooling mode.
The liquid side stop valve is used for being in a closed state when the refrigerant is recovered.
Specifically, the liquid side stop valve 11 is an electric valve, and the control module is used for controlling the electric valve to be closed when receiving the refrigerant recovery control signal.
Or, the liquid side stop valve 11 is a manual valve, and the control module is used for outputting a prompt of closing the manual valve when receiving the refrigerant recovery control signal.
The outdoor unit of the embodiment comprises a display module, and the control module displays a prompt for closing the manual valve on the display module to remind an operator to close the liquid side stop valve 11.
The control module receives the high-pressure side pressure and controls the corresponding frequency of the compressor and the rotating speed of the outdoor fan according to the high-pressure side pressure.
Specifically, the frequency of the compressor is controlled to be reduced along with the increase of the high-pressure side pressure, and the higher the high-pressure side pressure is, the larger the reduction amplitude of the frequency of the compressor is, so that the refrigerant quantity in the outdoor heat exchangers of the outdoor units can be dynamically distributed, and the machine set is prevented from being stopped due to overhigh pressure caused by the overhigh refrigerant quantity in the outdoor heat exchanger of one outdoor unit.
The frequency of the outdoor unit fan is controlled to rise along with the rise of the high-pressure side pressure, the higher the high-pressure side pressure is, the larger the frequency rise amplitude of the outdoor fan is, the pressure values of all the units can be balanced, the shutdown caused by the overhigh pressure value of one unit is prevented, and the refrigerant recovery is finished in advance.
The control module is used for receiving the low-pressure side pressure and controlling the bypass electromagnetic valve to be closed when the corresponding low-pressure side pressure is lower than a second pressure set value, so that the high-pressure and low-pressure bypass is prevented from causing refrigerant recovery failure.
The indoor electronic expansion valve 13 is controlled to adjust the opening degree to be larger than the set opening degree of the indoor electronic expansion valve after the bypass electromagnetic valve is in a closed state. The opening of the indoor electronic expansion valve is adjusted to be larger, so that the refrigerant on the indoor side can be quickly recovered to the outdoor high-pressure side, the refrigerant recovery speed is increased, and the refrigerant recovery quantity is increased.
The control module is used for receiving the pressure of the low-pressure side, and when the minimum value of the pressure of the low-pressure side is lower than a first pressure set value, the gas side stop valve 12 is in a closed state, and the refrigerant recovery is finished. The control module controls the compressor to stop, and components such as the indoor heat exchanger 14, the indoor electronic expansion valve 13 and the like can be replaced.
Specifically, the gas side stop valve 12 is an electric valve, and the control module is used for controlling the electric valve to be closed when the refrigerant recovery is completed.
Or, the gas-side stop valve 12 is a manual valve, and the control module is used for outputting a prompt of closing the manual valve when the refrigerant recovery is completed.
The outdoor unit of the embodiment comprises a display module, and the control module displays a prompt for closing the manual valve on the display module to remind an operator to close the gas side stop valve 12.
During artifical recovery refrigerant among the prior art, need pull out bypass solenoid valve coil when the refrigerant is retrieved and is about to end, prevent high low pressure bypass, will point in real time and examine low pressure lateral pressure in recovery process moreover, but because partial operating personnel experience is not enough when retrieving the refrigerant, lead to not manually pulling out bypass solenoid valve coil in the refrigerant recovery later stage, lead to the refrigerant to retrieve the failure. This embodiment need not manual operation plug bypass solenoid valve coil and artifical point and examines low pressure lateral pressure, has reduced maintenance personal misoperation's probability, and this embodiment can be when satisfying the preset condition self-closing bypass solenoid valve, need not manual operation, has avoided the error.
The outdoor unit further includes:
and a high-side pressure detection module 4 for detecting the high-side pressure. Can be positioned on a pipeline between the outlet of the one-way valve and the first interface of the four-way valve.
And/or the compressor exhaust temperature detection module is used for detecting the exhaust temperature of the compressor.
And/or the timing module is used for timing the refrigerant recovery time.
The control module is used for controlling the compressor to stop and outputting an alarm signal when the exhaust temperature of the compressor is higher than a set temperature or the high-side pressure is higher than a set pressure or the refrigerant recovery time is longer than a set time.
The second outdoor electronic expansion valve is used for being controlled to adjust the opening degree to be smaller than the set opening degree of the second outdoor electronic expansion valve before the compressor is stopped.
The opening degree of the second outdoor electronic expansion valve is adjusted to a small opening degree before the compressor is stopped, so that the problem that the pressure is increased sharply due to the fact that liquid refrigerants in the outdoor heat exchanger 9 are changed into gaseous state along with the rising of outdoor environment temperature is solved, and potential safety hazards are avoided.
In the embodiment, parameters influencing the reliability of the system are monitored in real time in the refrigerant recovery process, and the system can be automatically stopped when the parameters influencing the reliability of the system are detected, so that the reliability of the system is improved, and the reliability of the system cannot be ensured when the refrigerant is manually recovered in the prior art.
The outdoor unit also comprises a display module for displaying the refrigerant recovery time and the low-pressure side pressure.
The control module is used for judging whether the refrigerant recovery is successful or not and displaying the refrigerant recovery through the display module.
In this embodiment, data related to refrigerant recovery, such as pressure, time, and the like, may be directly displayed on the outdoor unit display module, so as to realize visualization. Of course, the data can also be sent to the cloud platform or the intelligent terminal. According to the embodiment, whether the low-pressure side pressure, the refrigerant recovery time and the refrigerant recovery are successful or not is displayed on the outdoor unit display module, the refrigerant recovery automation degree is improved, and the accuracy of refrigerant recovery is greatly improved.
As shown in fig. 3, the working flow of the multi-connected air conditioner of the present embodiment is as follows:
and S1, receiving a refrigerant recovery control signal.
And S2, controlling the operation of the compressor, controlling a first interface of a four-way valve of the four-way valve to be connected with a second interface of the four-way valve, controlling a third interface of the four-way valve to be connected with a fourth interface of the four-way valve, and controlling the indoor electronic expansion valve and the first outdoor electronic expansion valve to be opened. And controlling the air conditioner to operate in a cooling mode for releasing the temperature control.
And S3, closing the liquid side stop valve.
And S4, dynamically adjusting the frequency of the compressor and the frequency of the outdoor unit fan according to the high-pressure side pressure.
And S5, closing the bypass solenoid valve when the low-pressure side pressure is lower than the second pressure set value.
And S6, adjusting the opening degree of the indoor electronic expansion valve to be larger than the set opening degree of the indoor electronic expansion valve.
And S7, when the minimum value of the low-pressure side pressure is lower than the first pressure set value, closing the gas side stop valve, completing refrigerant recovery, and controlling the compressor to stop.
In steps S3-S7, the discharge temperature and/or the high-pressure side pressure and/or the refrigerant recovery time of the compressor are/is detected in real time, and the control module is used for controlling the opening degree of the second outdoor electronic expansion valve to be smaller than the set opening degree of the second outdoor electronic expansion valve, then controlling the compressor to stop and outputting an alarm signal when the discharge temperature of the compressor is higher than the set temperature or the high-pressure side pressure is higher than the set pressure or the refrigerant recovery time is longer than the set time. And the display module displays the information of the refrigerant recovery time, the low-pressure side pressure, whether the refrigerant recovery is successful and the like.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A multi-connected air conditioner comprises at least one outdoor unit and a plurality of parallel indoor units,
the outdoor unit includes:
at least one compressor comprising a compressor outlet and a compressor inlet;
the four-way valve comprises a first four-way valve interface, a second four-way valve interface, a third four-way valve interface and a fourth four-way valve interface, and the third four-way valve interface is connected with the inlet of the compressor; a low-pressure side pressure detection module is arranged on a pipeline between the third interface of the four-way valve and the inlet of the compressor and is used for detecting the low-pressure side pressure;
the check valve comprises a check valve inlet and a check valve outlet, the check valve inlet is connected with the compressor outlet, and the check valve outlet is connected with a first interface of the four-way valve;
the outdoor heat exchanger comprises an outdoor heat exchanger first interface and an outdoor heat exchanger second interface, and the outdoor heat exchanger first interface is connected with the four-way valve second interface;
the first outdoor electronic expansion valve comprises a first interface and a second interface, and the first interface is connected with the second interface of the outdoor heat exchanger;
the liquid side stop valve is connected with a second interface of the first outdoor electronic expansion valve;
the gas side stop valve is connected with a fourth interface of the four-way valve;
each of the indoor units includes:
the indoor heat exchanger comprises an indoor heat exchanger first interface and an indoor heat exchanger second interface, and the indoor heat exchanger first interface is connected with the gas side stop valve;
the indoor electronic expansion valve comprises an indoor electronic expansion valve first interface and an indoor electronic expansion valve second interface, the indoor electronic expansion valve first interface is connected with the indoor heat exchanger second interface, and the indoor electronic expansion valve second interface is connected with the liquid side stop valve;
it is characterized in that the preparation method is characterized in that,
the air conditioner comprises a control module, wherein the control module is used for controlling the compressor to run when receiving a refrigerant recovery control signal, and controlling a first interface of a four-way valve of the four-way valve to be connected with a second interface of the four-way valve and a third interface of the four-way valve to be connected with a fourth interface of the four-way valve; controlling all the indoor electronic expansion valves and the first outdoor electronic expansion valve to be opened;
the liquid side stop valve is used for being in a closed state when a refrigerant is recovered;
the control module is used for receiving the low-pressure side pressure, and when the low-pressure side pressure is lower than a first pressure set value, the gas side stop valve is in a closed state; controlling the compressor to stop;
the outdoor unit further includes:
the high-pressure side pressure detection module is used for detecting the high-pressure side pressure; the high-pressure side pressure detection module is arranged on a pipeline between the outlet of the compressor and a first interface of the four-way valve;
and/or, a compressor discharge temperature detection module for detecting the discharge temperature of the compressor;
and/or, the timing module is used for timing the refrigerant recovery time;
the control module is used for controlling the compressor to stop and outputting an alarm signal when the maximum value of the exhaust temperature of the compressor is higher than a set temperature, or the maximum value of the high-pressure side pressure is greater than a set pressure, or the refrigerant recovery time is greater than a set time.
2. A multi-connected air conditioner according to claim 1, wherein the outdoor unit comprises:
and the bypass electromagnetic valve is used for connecting a third interface of the four-way valve and an outlet of the one-way valve, and is controlled to be closed when the pressure of the low-pressure side is lower than a second pressure set value, and the second pressure set value is larger than the first pressure set value.
3. A multi-connected air conditioner according to claim 2, wherein the indoor electronic expansion valve is controlled to adjust the opening degree to be larger than the set opening degree of the indoor electronic expansion valve after the bypass solenoid valve is in a closed state.
4. A multi-connected air conditioner according to claim 1,
the frequency of the compressor is controlled to decrease as the high side pressure increases, and the higher the high side pressure is, the greater the decrease in the frequency of the compressor is.
5. A multi-connected air conditioner according to claim 1, wherein the air conditioner comprises:
and the frequency of the outdoor unit fan is controlled to increase along with the increase of the high-pressure side pressure, and the frequency of the outdoor unit fan increases in a larger amplitude when the high-pressure side pressure is higher.
6. A multi-connected air conditioner according to claim 1, wherein the gas side stop valve and the liquid side stop valve are electrically operated valves, and the control module is configured to control the liquid side stop valve to close when receiving a refrigerant recovery control signal, and to control the gas side stop valve to close when the refrigerant recovery is completed;
or the gas side stop valve and the liquid side stop valve are manual valves, and the control module is used for outputting a prompt of closing the liquid side stop valve when receiving a refrigerant recovery control signal and outputting a prompt of closing the gas side stop valve when the refrigerant recovery is finished.
7. A multi-connected air conditioner according to claim 1, wherein the air conditioner comprises:
the plate heat exchanger comprises a first heat exchanger interface, a second heat exchanger interface, a third heat exchanger interface and a fourth heat exchanger interface which are communicated with each other, wherein the first heat exchanger interface and the second heat exchanger interface which are communicated with each other are connected to a pipeline between the second interface of the first outdoor electronic expansion valve and the liquid side stop valve;
the second outdoor electronic expansion valve is positioned on a pipeline between the fourth interface of the heat exchanger and the first interface of the heat exchanger; the second outdoor electronic expansion valve is used for being controlled to adjust the opening degree to be smaller than the set opening degree of the second outdoor electronic expansion valve before the compressor is stopped.
8. A multi-connected air conditioner according to any one of claims 1 to 7, wherein the control module is located in an outdoor unit provided with a button for generating a refrigerant recovery control signal.
9. A multi-connected air conditioner according to any one of claims 1 to 7, wherein the outdoor unit includes a display module for displaying a refrigerant recovery time and a low-pressure side pressure; the control module is used for judging whether the refrigerant recovery is successful or not and displaying the refrigerant recovery through the display module.
CN202010065150.6A 2020-01-20 2020-01-20 Multi-connected air conditioner Active CN111121156B (en)

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