CN111121154B - Multi-connected air conditioner - Google Patents

Multi-connected air conditioner Download PDF

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Publication number
CN111121154B
CN111121154B CN202010065128.1A CN202010065128A CN111121154B CN 111121154 B CN111121154 B CN 111121154B CN 202010065128 A CN202010065128 A CN 202010065128A CN 111121154 B CN111121154 B CN 111121154B
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interface
valve
pressure
outdoor
electronic expansion
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CN111121154A (en
Inventor
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
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (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 is divided into different refrigerant recovery schemes according to the number of outdoor units, wherein when one outdoor unit is adopted, an air side stop valve is closed, the refrigerant can be quickly recovered to a pipeline between a one-way valve and the air side stop valve under the power action of a compressor, whether the refrigerant is completely recovered or not is judged through the low-pressure side pressure, and the refrigerant recovery maximization can be realized. When a plurality of outdoor units are arranged, the outdoor electronic expansion valves are opened and the indoor electronic expansion valves are closed, and under the power action of the compressor, the refrigerant can be recovered to a pipeline between the one-way valve and the indoor electronic expansion valves, on one hand, the refrigerant can be stored in the pipeline of the indoor electronic expansion valves and the liquid side stop valves, the refrigerant can be stored in an outdoor heat exchanger of the outdoor unit of a component to be replaced, and the recovery amount of the refrigerant is increased; on the other hand, the refrigerant on the low-pressure side of the component to be replaced can be drawn out through the compressor of the component to be replaced or the compressors of other outdoor units as soon as possible.

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
For a multi-connected air conditioner, a plurality of outdoor units are generally connected together as the capacity demand increases, and a single module also selects to adopt two compressors or a plurality of compressors as the capacity demand of the single module increases.
When the multi-split air conditioner is used, the components on the refrigerant flow path of the compressor or the outdoor unit often break down and need to be replaced. At present, when damaged parts such as a compressor and the like are replaced, some direct refrigerants are completely discharged, so that the cost is wasted and the environment is polluted; 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 such as a compressor and the like 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 an 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;
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 outdoor electronic expansion valve comprises an outdoor electronic expansion valve first interface and an outdoor electronic expansion valve second interface, and the outdoor electronic expansion valve first interface is connected with the outdoor heat exchanger second interface;
the liquid side stop valve is connected with the second interface of the 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;
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;
the control module is used for judging the number of the outdoor units;
when one outdoor unit is arranged, the gas side stop valve is 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 refrigerant recovery is finished;
when a plurality of outdoor units are arranged, the control module is used for controlling the outdoor electronic expansion valves to be opened and controlling the indoor electronic expansion valves to be closed; the control module is used for receiving the low-pressure side pressure, and when the minimum value of the low-pressure side pressure is lower than a first pressure set value, refrigerant recovery is finished.
Compared with the prior art, the technical scheme of the invention has the following technical effects: the multi-connected air conditioner is divided into different refrigerant recovery schemes according to the number of the outdoor units, when one outdoor unit is adopted, the air side stop valve is closed, the refrigerant is quickly recovered to a pipeline between the one-way valve and the air side stop valve under the power action of the compressor, whether the refrigerant is completely recovered or not is judged through the low-pressure side pressure, and the refrigerant recovery maximization can be realized. When a plurality of outdoor units are arranged, the outdoor electronic expansion valves are opened and the indoor electronic expansion valves are closed, and under the power action of the compressor, the refrigerant can be recovered to a pipeline between the one-way valve and the indoor electronic expansion valves, on one hand, the refrigerant can be stored in the pipeline of the indoor electronic expansion valves and the liquid side stop valves, the refrigerant can be stored in an outdoor heat exchanger of the outdoor unit of a component to be replaced, and the recovery amount of the refrigerant is increased; on the other hand, the refrigerant on the low-pressure side of the component to be replaced can be drawn out through the compressor of the component to be replaced or the compressors of other outdoor units as soon as possible. The invention can realize the recovery of the refrigerant without changing the hardware structure of the multi-connected air conditioner and additionally adding any part, thereby saving the cost and having strong operability. In addition, the degree of automation is greatly improved, the accuracy of refrigerant recovery is improved, the condition that the refrigerant is directly released into the environment is reduced, the cost of refrigerant waste 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 schematic diagram illustrating a refrigerant cycle of a multi-air conditioner including an outdoor unit according to an embodiment of the present invention.
Fig. 3 is a control block diagram of a multi-connected air conditioner according to an embodiment of the invention.
Fig. 4 is a refrigerant recovery flow chart of the multi-connected air conditioner according to the embodiment of the invention.
Fig. 5 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. an outdoor electronic expansion valve; 9. an outdoor heat exchanger; 10. a bypass solenoid valve; 11. a liquid side stop valve; 12. gas side stop valve, 13, indoor electronic expansion valve 14, indoor heat exchanger.
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.
As shown in fig. 1, the multi-air conditioner includes a plurality of outdoor units connected in parallel and a plurality of indoor units connected in parallel. In the present embodiment, three indoor units connected in parallel and three outdoor units connected in parallel are taken as an example for description, but the number of the indoor units and the outdoor units is not limited in the present invention.
In this embodiment, the outdoor unit 1 is taken as an example for explanation, and the outdoor units 2 and 3 are the same as the outdoor unit 1 and are not described again.
The outdoor unit 1 includes:
a compressor 1, the compressor 1 comprising a compressor outlet and a compressor inlet. Of course, the outdoor unit 1 may also include two or more compressors 1, and in this case, the compressors 1 are arranged in parallel, as shown in fig. 5.
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 electronic expansion valve 8 comprises a first interface of the outdoor electronic expansion valve and a second interface of the outdoor electronic expansion valve, and the first interface of the 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 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 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.
In this embodiment, the indoor unit 1 is taken as an example for explanation, and the indoor units 2 and 3 are the same as the indoor unit 1 and are not described again.
The indoor unit 1 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 multi-air conditioner includes one outdoor unit and a plurality of indoor units connected in parallel. In the present embodiment, three indoor units connected in parallel and one outdoor unit connected in parallel are taken as an example for description, but the number of the indoor units is not limited in the present invention.
The refrigerant circulation systems of the outdoor unit 1 and the indoor units 1, and the indoor units 2 and 3 are the same as those in fig. 1, and are not described again.
As shown in fig. 3, 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 the temperature limitation.
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 all outdoor electronic expansion valves to be opened. The refrigerant flows in the flow direction of the cooling mode.
The control module is used for judging the number of the outdoor units. The control module obtains the number of the outdoor units by detecting the number of the outdoor units communicating with the control module. In this embodiment, a dial switch is arranged on each outdoor unit, the dial setting of each outdoor unit is unique, and the control module obtains the dial switch information on each outdoor unit to obtain the number of the outdoor units.
When the outdoor units are multiple, the control module is used for controlling all outdoor electronic expansion valves to be opened and controlling all indoor electronic expansion valves to be closed.
Preferably, the control module is used for controlling the opening degree of the outdoor electronic expansion valve of the outdoor unit of the component to be replaced to be larger than the opening degrees of the outdoor electronic expansion valves of the other outdoor units.
Furthermore, the control module is used for controlling the opening degree of an outdoor electronic expansion valve of the outdoor unit of the component to be replaced to be the maximum opening degree.
In the prior art, the refrigerant recovery is to pump the refrigerant on the low-pressure side of the outdoor unit of the component to be replaced away through the compressors of other outdoor units by closing the liquid side stop valve, and the outdoor electronic expansion valve of the outdoor unit of the component to be replaced is in a closed state. In the embodiment, all the outdoor electronic expansion valves are controlled to be opened, and all the indoor electronic expansion valves are controlled to be closed, so that the refrigerant can be stored in the outdoor heat exchanger of the outdoor unit of the part to be replaced, and the recovery amount of the refrigerant is maximized; the outdoor electronic expansion valve is opened and opened to the maximum opening degree, so that the refrigerant on the low-pressure side of the outdoor unit of the part to be replaced can be pumped away through the compressor as soon as possible; the closing of the indoor electronic expansion valve can enable a pipeline between the indoor electronic expansion valve and the liquid side stop valve to store a refrigerant. In addition, the refrigerant recovery amount can be maximized without manual operation by adding the indoor electronic expansion valve control.
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 air side stop valve 12 of the outdoor unit of the component to be replaced is used for closing when the minimum value of the low-pressure side pressure is lower than the third pressure set value, so that the compressor is prevented from being vacuumized and the reliability of the system is prevented from being influenced.
The gas side shutoff valves 12 of the remaining outdoor units may be closed or not closed when the minimum value of the low side pressure is lower than the third pressure set value.
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 refrigerant recovery is finished. The control module controls the compressor to stop, and components such as the compressor 1, the oil separator 2, the gas-liquid separator 7 and the like can be replaced.
Wherein the second pressure set point is greater than the third pressure set point and greater than the first pressure set point.
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 compressor exhaust temperature.
And/or the timing module is used for timing the refrigerant recovery time.
The control module is used for controlling all the compressors to stop and outputting alarm signals when the maximum value of the exhaust temperature of the compressors is higher than the set temperature or the high-pressure side pressure is higher than the maximum value of the set pressure or the refrigerant recovery time is longer than the set time.
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.
When there is one outdoor unit, the gas side shutoff valve 12 is closed at the time of refrigerant recovery.
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 receiving the refrigerant recovery control signal.
Or, the gas-side stop valve 12 is a manual valve, and the control module is configured to output a prompt for 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 gas side stop valve 12.
The control module is used for receiving the low-pressure side pressure and controlling the bypass electromagnetic valve to be closed when the low-pressure side pressure is lower than a second pressure set value, so that high-pressure and low-pressure bypass is prevented, and refrigerant recovery failure is prevented.
And when the pressure of the low-pressure side is lower than the first pressure set value, the refrigerant recovery is finished. The control module controls the compressor to stop, and components such as the compressor 1, the oil separator 2, the gas-liquid separator 7 and the like can be replaced.
Wherein the second pressure set point is greater than the first pressure set point.
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 compressor exhaust temperature.
And/or the timing module is used for timing the refrigerant recovery time.
The control module is used for controlling all the compressors to stop and outputting alarm signals when the maximum value of the exhaust temperature of the compressors is higher than the set temperature or the maximum value of the high-pressure side pressure is greater than the set pressure or the refrigerant recovery time is greater than the set time.
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.
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. 4, 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 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, judging whether the number of the outdoor units is one, if not, entering the step S4, otherwise, entering the step S8.
And S4, controlling the outdoor electronic expansion valve to be opened and controlling the indoor electronic expansion valve to be closed.
Preferably, the opening degree of the outdoor electronic expansion valve of the outdoor unit of the component to be replaced is controlled to be larger than the opening degrees of the outdoor electronic expansion valves of the other outdoor units.
Further, the opening degree of an outdoor electronic expansion valve of the outdoor unit of the component to be replaced is controlled to be the maximum opening degree.
And S5, closing the corresponding bypass solenoid valve when the low-pressure side pressure is lower than the second pressure set value.
And S6, closing the air side stop valve of the outdoor unit of the component to be replaced when the minimum value of the low pressure side pressure is lower than the third pressure set value.
And S7, when the minimum value of the low-pressure side pressure is lower than the first pressure set value, completing refrigerant recovery and controlling the compressor to stop.
In steps S4-S7, the discharge temperature of the compressor and/or the pressure of the high-pressure side and/or the refrigerant recovery time are detected in real time, and the control module is used for controlling all the compressors to stop and outputting an alarm signal when the maximum value of the discharge temperature of the compressor is higher than a set temperature or the maximum value of the pressure of the high-pressure side is greater than a set pressure or the refrigerant recovery time is greater 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.
And S8, closing the gas side stop valve.
And S9, closing the bypass solenoid valve when the low-pressure side pressure is lower than the second pressure set value.
And S10, when the pressure of the low-pressure side is lower than the first pressure set value, the refrigerant recovery is finished, and the compressor is controlled to stop.
In steps S8-S10, the discharge temperature of the compressor and/or the pressure of the high-pressure side and/or the refrigerant recovery time are detected in real time, and the control module is used for controlling all the compressors to stop and outputting an alarm signal when the maximum value of the discharge temperature of the compressor is higher than a set temperature or the maximum value of the pressure of the high-pressure side is greater than a set pressure or the refrigerant recovery time is greater 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 (12)

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;
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 outdoor electronic expansion valve comprises an outdoor electronic expansion valve first interface and an outdoor electronic expansion valve second interface, and the outdoor electronic expansion valve first interface is connected with the outdoor heat exchanger second interface;
the liquid side stop valve is connected with the second interface of the 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;
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;
the control module is used for judging the number of the outdoor units;
when one outdoor unit is arranged, the gas side stop valve is 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 refrigerant recovery is finished;
when a plurality of outdoor units are arranged, the control module is used for controlling the outdoor electronic expansion valves to be opened and controlling the indoor electronic expansion valves to be closed; the control module is used for receiving the low-pressure side pressure, and when the minimum value of the low-pressure side pressure is lower than a first pressure set value, the refrigerant recovery is finished;
the control module is used for controlling the opening degree of the outdoor electronic expansion valve of the outdoor unit of the component to be replaced to be larger than the opening degrees of the outdoor electronic expansion valves of other outdoor units.
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 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 1, wherein, when the outdoor units are plural, the air side cut-off valve of the outdoor unit of the component to be replaced is adapted to be closed when the minimum value of the low pressure side pressure is lower than a third pressure setting value, which is greater than the first pressure setting value.
4. A multi-connected air conditioner according to claim 1, wherein the air side stop valve is an electrically operated valve, and the control module is configured to control the electrically operated valve to close when receiving a refrigerant recovery control signal;
or the gas-side stop valve is a manual valve, and the control module is used for outputting a prompt of closing the manual valve when receiving a refrigerant recovery control signal.
5. A multi-connected air conditioner according to claim 1, wherein said control module is adapted to control the opening degree of an outdoor electronic expansion valve of an outdoor unit of a component to be replaced to a maximum opening degree.
6. A multi-connected air conditioner according to any one of claims 1 to 5, wherein the outdoor unit comprises:
the high-pressure side pressure detection module is used for detecting the high-pressure side pressure;
and/or, a compressor discharge temperature detection module for detecting the compressor discharge temperature;
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.
7. A multi-connected air conditioner according to any one of claims 1 to 5, wherein the control module is located in an outdoor unit provided with a button for generating a refrigerant recovery control signal.
8. A multi-connected air conditioner according to claim 6, 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 5, wherein the outdoor unit includes a display module for displaying a refrigerant recovery time and a low-pressure side pressure.
10. A multi-connected air conditioner according to claim 9, wherein the control module is adapted to determine whether the refrigerant recovery is successful and display the result via the display module.
11. A multi-connected air conditioner according to claim 6, wherein the outdoor unit includes a display module for displaying a refrigerant recovery time and a low-pressure side pressure.
12. A multi-connected air conditioner according to claim 11, wherein the control module is adapted to determine whether the refrigerant recovery is successful and display the result via the display module.
CN202010065128.1A 2020-01-20 2020-01-20 Multi-connected air conditioner Active CN111121154B (en)

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