CN113339883A - Air conditioner for preventing refrigerant leakage and control method thereof - Google Patents
Air conditioner for preventing refrigerant leakage and control method thereof Download PDFInfo
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- CN113339883A CN113339883A CN202110603085.2A CN202110603085A CN113339883A CN 113339883 A CN113339883 A CN 113339883A CN 202110603085 A CN202110603085 A CN 202110603085A CN 113339883 A CN113339883 A CN 113339883A
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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
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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
- 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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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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
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- 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
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
Abstract
The present disclosure provides an air conditioner for preventing leakage of refrigerant and a control method thereof, the air conditioner including: the control device controls the first control valve to close and maintains the second control valve to continuously open for a first preset time t1 when the air conditioner operates in a refrigeration mode and when a shutdown signal or a refrigerant leakage signal is detected; when the air conditioner operates in the heating mode, when a shutdown signal or a refrigerant leakage signal is detected, the second control valve is controlled to be closed first, and the first control valve is maintained to be opened continuously for a second preset time t 2. According to the air conditioner, the refrigerant of the indoor unit can be transferred to the outdoor unit when the air conditioner is turned off, the possibility of leakage of the refrigerant at the indoor side in the off state is avoided, and the residual refrigerant can be transferred to the pipeline at the outdoor side from the indoor side in time when the air leakage condition exists in the system in the running process of the air conditioner, so that the refrigerant can be effectively prevented from being leaked indoors in a large amount, and the possibility of combustion and explosion in the room is avoided.
Description
Technical Field
The disclosure relates to the technical field of air conditioners, in particular to an air conditioner for preventing refrigerant leakage and a control method thereof.
Background
At present, under the background of protecting the ozone layer and suppressing global warming, many international research institutes have conducted researches on replacing traditional refrigerants with environment-friendly hydrocarbon refrigerants, but many of the current environment-friendly hydrocarbon refrigerants are flammable and explosive, such as R600a, R290, R32, R1234YF, R1270, etc., and the flammable and explosive characteristics are the most fatal defects of the hydrocarbon refrigerants under the condition of leakage. Therefore, the air conditioner capable of preventing the refrigerant from leaking is the premise of adopting the flammable, explosive and environment-friendly refrigerant.
Because the air conditioner in the prior art has the technical problems that the refrigerant is easy to leak, and potential safety hazards such as flammability and explosiveness are caused, the air conditioner for preventing the refrigerant from leaking and the control method thereof are researched and designed according to the disclosure.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
Therefore, the technical problem to be solved by the present disclosure is to overcome the defects of potential safety hazards, such as easy leakage of refrigerant, flammability and explosiveness, etc., existing in the air conditioner in the prior art, so as to provide an air conditioner for preventing refrigerant leakage and a control method thereof.
In order to solve the above problems, the present disclosure provides an air conditioner preventing leakage of refrigerant, comprising:
the indoor unit is connected with the compressor through a second pipeline, a first control valve is arranged on the first pipeline, and a second control valve is arranged on the second pipeline;
the air conditioner further includes:
the detection device is used for detecting whether a signal related to machine signal or refrigerant leakage exists or not and detecting a parameter corresponding to the operation mode of the air conditioner;
the judging device is used for judging whether the operation mode of the air conditioner is a cooling mode or a heating mode;
the control device is used for firstly controlling the first control valve to be closed and maintaining the second control valve to be continuously opened for a first preset time t1 when the air conditioner operates in a refrigeration mode and a shutdown signal or a refrigerant leakage signal is detected, and closing the second control valve after t 1; when the air conditioner operates in the heating mode, and when a shutdown signal or a refrigerant leakage signal is detected, the second control valve is controlled to be closed first, the first control valve is maintained to be opened continuously for a second preset time t2, and the first control valve is closed after t 2.
In some embodiments, the control device is further configured to maintain the compressor to be continuously turned on for the first preset time t1 when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner is operated in a cooling mode, and after the first control valve is controlled to be closed; the control device is further configured to maintain the compressor to be continuously started for the second preset time t2 when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in the heating mode, and after the second control valve is controlled to be closed.
In some embodiments, the control device is further configured to close when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in a cooling mode, and after controlling to close the second control valve, and controlling to maintain the compressor to continue to be started for a third preset time t 3; the control device is further configured to close the compressor after controlling to close the first control valve and controlling to maintain the compressor to continue to be opened for a fourth preset time t4 when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner operates in the heating mode.
In some embodiments, the control device is further configured to control the indoor unit to be turned off when a shutdown signal is detected and when the air conditioner is operating in the cooling mode, and at the same time as or before the first control valve is controlled to be turned off; and the controller is also used for controlling the indoor unit to be closed when the shutdown signal is detected and when the air conditioner runs in the heating mode, and at the same time of controlling the second control valve to be closed or before controlling the second control valve to be closed.
In some embodiments, the control device is further configured to control the indoor unit to continue to operate until the compressor is turned off when the refrigerant leakage signal is detected and when the air conditioner operates in the cooling mode; and the indoor unit is also used for controlling the indoor unit to continuously operate until the compressor is shut down when a refrigerant leakage signal is detected and the air conditioner operates in the heating mode.
In some embodiments, the air conditioner further comprises a throttling device disposed on the first pipe;
the control device is also used for controlling the opening degree of the throttling device to be opened to the maximum and simultaneously controlling the rotating speed of the compressor to be reduced to a target value when a shutdown signal or a refrigerant leakage signal is detected and before a parameter corresponding to the running mode of the air conditioner is detected; and detecting the parameters corresponding to the operation mode of the air conditioner after the rotating speed of the compressor is reduced to the target value.
In some embodiments, the first preset time t1 is 1 min; the second preset time t2 is 1 min; the third preset time t3 is 2 s; the second preset time t2 is 2 s.
The present disclosure also provides a control method of an air conditioner for preventing leakage of refrigerant as set forth in any one of the above, comprising:
detecting parameters corresponding to the operation mode of the air conditioner and detecting whether a shutdown signal or a refrigerant leakage signal exists;
judging whether the operation mode of the air conditioner is a cooling mode or a heating mode;
a control step, when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner operates in a refrigeration mode, firstly controlling the first control valve to be closed, maintaining the second control valve to be continuously opened for a first preset time t1, and closing the second control valve after t 1; when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in a heating mode, the second control valve is controlled to be closed first, the first control valve is maintained to be opened continuously for a second preset time t2, and the first control valve is closed after t 2.
In some embodiments, the controlling step may further include controlling to maintain the compressor to be continuously turned on for the first preset time t1 when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner is operated in a cooling mode and after the first control valve is controlled to be closed; the controlling step may further include controlling to maintain the compressor to be continuously turned on for the second preset time t2 when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in the heating mode, and after the second control valve is controlled to be closed.
In some embodiments, the controlling step may further include controlling to close the compressor after controlling to close the second control valve and after controlling to maintain the compressor to be continuously turned on for a third preset time t3 when a shutdown signal or a signal indicating refrigerant leakage is detected and when the air conditioner is operated in a cooling mode; the controlling step can also be performed when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in the heating mode, and after the first control valve is controlled to be closed, the compressor is controlled to be kept on for a fourth preset time t 4.
In some embodiments, the controlling step may further control the indoor unit to be turned off when a shutdown signal is detected and when the air conditioner is operating in the cooling mode, and at the same time as or before the first control valve is controlled to be turned off; it is also possible to control the indoor unit to be turned off when the shutdown signal is detected, and when the air conditioner is operating in the heating mode, and at the same time as or before the second control valve is controlled to be closed.
In some embodiments, the control device is further configured to control the indoor unit to continue to operate until the compressor is turned off when the refrigerant leakage signal is detected and when the air conditioner operates in the cooling mode; and the indoor unit is also used for controlling the indoor unit to continuously operate until the compressor is shut down when a refrigerant leakage signal is detected and the air conditioner operates in the heating mode.
In some embodiments, when the air conditioner further comprises a throttling device;
the control step is that when a shutdown signal or a refrigerant leakage signal is detected and before a parameter corresponding to an operation mode of the air conditioner is detected, the opening degree of the throttling device is controlled to be maximum, and meanwhile, the rotating speed of the compressor is controlled to be reduced to a target value; and detecting the parameters corresponding to the operation mode of the air conditioner after the rotating speed of the compressor is reduced to the target value.
The air conditioner for preventing the refrigerant leakage and the control method thereof provided by the present disclosure have the following beneficial effects:
the invention discloses a refrigerant-air conditioner, which is characterized in that a first control valve and a second control valve are respectively arranged on two pipelines connected with an indoor unit and an outdoor unit, wherein the first control valve is connected between the indoor unit and an outdoor heat exchanger, and the second control valve is connected between the indoor unit and the compressor, so that the refrigerant firstly enters the indoor unit through the compressor and the outdoor heat exchanger and finally returns to the compressor during the refrigeration operation of the air conditioner, and the refrigerant firstly passes through the compressor, the indoor unit and finally returns to the compressor through the outdoor heat exchanger during the heating operation, therefore, when a shutdown signal or a refrigerant leakage signal is detected in a refrigeration mode, the first control valve is controlled to be closed firstly, the outdoor unit can be effectively controlled not to convey the refrigerant towards the indoor unit any more, at the moment, the second control valve is kept open, the refrigerant in the indoor unit and the pipeline connected with the indoor unit is driven to flow back into the outdoor unit, and the second control valve is controlled to be closed after t1 time, the refrigerant in the indoor unit is finally and effectively transferred to the outdoor unit, so that the condition that a large amount of refrigerant is accumulated in the indoor unit under the condition of shutdown or refrigerant leakage in a refrigeration mode to cause large amount of leakage at the indoor side is effectively avoided; when a shutdown signal or a refrigerant leakage signal is detected in the heating mode, the second control valve is controlled to be closed firstly, so that the outdoor unit can be effectively controlled not to convey the refrigerant to the indoor unit any more, the first control valve is kept open at the moment, the indoor unit and the refrigerant in the connected pipeline are driven to flow back into the outdoor unit, and the first control valve is controlled to be closed after t2 time, so that the refrigerant in the indoor unit is finally and effectively transferred into the outdoor unit, and the condition that a large amount of refrigerant is accumulated in the indoor unit under the shutdown or refrigerant leakage condition in the cooling mode to cause large amount of leakage at the indoor side is effectively avoided; therefore, the air conditioner disclosed by the invention is additionally provided with the refrigerant leakage prevention device on the basis of the traditional air conditioner, and the refrigerant of the indoor unit is transferred to the outdoor unit when the air conditioner is turned off, so that the possibility of indoor side refrigerant leakage in the off state is completely eliminated. The leakage-proof function of the refrigerant can be started after the air leakage condition of the system is judged in the running process of the air conditioner, the residual refrigerant is transferred to the outdoor pipeline from the indoor side, the refrigerant can be effectively prevented from being leaked indoors in a large amount, the possibility of combustion and explosion in the room is avoided, the indoor side of the flammable and explosive refrigerant can be effectively prevented from being leaked in a large amount, and the air conditioner can adopt the environment-friendly, flammable and explosive hydrocarbon refrigerant.
Drawings
Fig. 1 is a system configuration diagram of an air conditioner for preventing leakage of refrigerant according to the present disclosure;
fig. 2 is a control flowchart of the air conditioner for preventing refrigerant leakage according to the present disclosure when a shutdown signal is detected;
fig. 3 is a control flowchart of the air conditioner for preventing refrigerant leakage according to the present disclosure when a refrigerant leakage signal is detected.
The reference numerals are represented as:
100. an outdoor unit; 101. a first pipeline; 102. a second pipeline; 1. a compressor; 2. an outdoor heat exchanger; 3. an indoor unit; 41. a first control valve; 42. a second control valve; 5. a four-way valve; 6. a throttling device.
Detailed Description
As shown in fig. 1 to 3, the present disclosure provides an air conditioner preventing leakage of refrigerant, comprising:
the outdoor unit 100 comprises a compressor 1 and an outdoor heat exchanger 2, the outdoor heat exchanger 2 is connected with the indoor unit 3 through a first pipeline 101, the indoor unit 3 is connected with the compressor 1 through a second pipeline 102, the first pipeline 101 is provided with a first control valve 41, and the second pipeline 102 is provided with a second control valve 42;
the air conditioner further includes:
the detection device is used for detecting whether a signal related to machine signal or refrigerant leakage exists or not and detecting a parameter corresponding to the operation mode of the air conditioner;
the judging device is used for judging whether the operation mode of the air conditioner is a cooling mode or a heating mode;
the control device is used for firstly controlling the first control valve 41 to be closed and maintaining the second control valve 42 to be continuously opened for a first preset time t1 when the air conditioner operates in a refrigeration mode and a shutdown signal or a refrigerant leakage signal is detected, and closing the second control valve 42 after t 1; when the air conditioner operates in the heating mode, and when a shutdown signal or a refrigerant leakage signal is detected, the second control valve 42 is first controlled to be closed, the first control valve 41 is maintained to be opened continuously for a second preset time t2, and the first control valve 41 is closed after t 2.
The invention discloses a refrigerant-air conditioner, which is characterized in that a first control valve and a second control valve are respectively arranged on two pipelines connected with an indoor unit and an outdoor unit, wherein the first control valve is connected between the indoor unit and an outdoor heat exchanger, and the second control valve is connected between the indoor unit and the compressor, so that the refrigerant firstly enters the indoor unit through the compressor and the outdoor heat exchanger and finally returns to the compressor during the refrigeration operation of the air conditioner, and the refrigerant firstly passes through the compressor, the indoor unit and finally returns to the compressor through the outdoor heat exchanger during the heating operation, therefore, when a shutdown signal or a refrigerant leakage signal is detected in a refrigeration mode, the first control valve is controlled to be closed firstly, the outdoor unit can be effectively controlled not to convey the refrigerant towards the indoor unit any more, at the moment, the second control valve is kept open, the refrigerant in the indoor unit and the pipeline connected with the indoor unit is driven to flow back into the outdoor unit, and the second control valve is controlled to be closed after t1 time, the refrigerant in the indoor unit is finally and effectively transferred to the outdoor unit, so that the condition that a large amount of refrigerant is accumulated in the indoor unit under the condition of shutdown or refrigerant leakage in a refrigeration mode to cause large amount of leakage at the indoor side is effectively avoided; when a shutdown signal or a refrigerant leakage signal is detected in the heating mode, the second control valve is controlled to be closed firstly, the outdoor unit can be effectively controlled not to convey the refrigerant to the indoor unit any more, the first control valve is kept open at the moment, the indoor unit and the refrigerant in the connected pipeline are driven to flow back into the outdoor unit, the first control valve is controlled to be closed after t2 time, the refrigerant in the indoor unit is finally and effectively transferred into the outdoor unit, and the condition that a large amount of refrigerant is accumulated in the indoor unit under the shutdown or refrigerant leakage condition in the cooling mode to cause large amount of leakage at the indoor side is effectively avoided.
Therefore, the air conditioner disclosed by the invention is additionally provided with the refrigerant leakage prevention device on the basis of the traditional air conditioner, and the refrigerant of the indoor unit is transferred to the outdoor unit when the air conditioner is turned off, so that the possibility of indoor side refrigerant leakage in the off state is completely eliminated. The leakage-proof function of the refrigerant can be started after the air leakage condition of the system is judged in the running process of the air conditioner, the residual refrigerant is transferred to the outdoor pipeline from the indoor side, the refrigerant can be effectively prevented from being leaked indoors in a large amount, the possibility of combustion and explosion in the room is avoided, the indoor side of the flammable and explosive refrigerant can be effectively prevented from being leaked in a large amount, and the air conditioner can adopt the environment-friendly, flammable and explosive hydrocarbon refrigerant.
The present disclosure 1 can effectively prevent the indoor unit part from leaking the refrigerant to the indoor when the air conditioner is in the off state;
2. and the leakage of flammable and explosive refrigerants on the indoor side can be avoided effectively when the leakage occurs under the running state of the air conditioner.
In some embodiments, the control device is further configured to maintain the compressor 1 to be continuously turned on for the first preset time t1 when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner is operated in a cooling mode, and after the first control valve 41 is controlled to be closed; the control device is further configured to maintain the compressor 1 to be continuously turned on for the second preset time t2 when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in the heating mode, and after the second control valve 42 is controlled to be closed. The control method is a further preferable control form of the present disclosure, namely when a shutdown signal and a refrigerant leakage signal are detected and in a refrigeration mode, after the first control valve is controlled to be closed, the compressor is controlled to be kept on for a first preset time t1, and the refrigerant of the indoor unit part can be recovered to the outdoor unit in a low-pressure suction mode through the continuous operation of the compressor, so that the refrigerant amount in the indoor unit is further effectively reduced, and the refrigerant leakage to the indoor side is reduced; similarly, when the shutdown and refrigerant leakage signals are detected and the heating mode is detected, the second control valve is controlled to be closed, the compressor is controlled to be kept on for the second preset time t2, and the refrigerant of the indoor unit part can be recycled to the outdoor unit in a low-pressure suction mode through the continuous operation of the compressor, so that the refrigerant quantity in the indoor unit is further effectively reduced, and the refrigerant leakage to the indoor side is reduced.
In some embodiments, the control device is further configured to close when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner is operated in a cooling mode, and after controlling to close the second control valve 42, and controlling to maintain the compressor 1 to be continuously turned on for a third preset time t 3; the control device is further configured to close the compressor 1 after controlling to close the first control valve 41 and controlling to maintain the compressor 1 to be continuously opened for a fourth preset time t4 when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner is operated in the heating mode. The compressor is controlled to be closed after t3 is continuously maintained by detecting a shutdown or refrigerant leakage signal and in a refrigeration mode and after the second control valve is closed, so that the further suction effect on the part of the pipeline connected with the second control valve can be ensured, the refrigerant is further sucked into the compressor, and the refrigerant recovery effect is achieved; similarly, when a shutdown or refrigerant leakage signal is detected, and in a heating mode, and after the first control valve is closed, the compressor is controlled to be continuously maintained at t4 and then closed, so that the further suction effect on the part of the pipeline connected with the first control valve can be ensured, the refrigerant is further sucked into the compressor, and the refrigerant recycling effect is achieved.
In some embodiments, the control device is further configured to control the indoor unit 3 to be turned off when a shutdown signal is detected and when the air conditioner is operating in the cooling mode, and at the same time as or before the first control valve 41 is controlled to be turned off; and is also used for controlling the closing of the indoor unit 3 when a shutdown signal is detected, and when the air conditioner is operating in the heating mode, and simultaneously with or before controlling the closing of the second control valve 42. The control method is a further preferable control form when the shutdown signal is detected, namely when the shutdown signal is detected, the indoor unit stops running, so that the indoor air can be effectively prevented from flowing and exchanging heat in the indoor unit, the refrigerant is recycled to the outdoor unit as soon as possible, and the consumption of electric energy in the indoor unit is reduced.
When the air conditioner is started, the first control valve 41 and the second control valve 42 (both preferably electromagnetic valves or electronic valves) are simultaneously opened, the air conditioner normally operates, when the air conditioner receives a shutdown signal, the internal unit stops operating, the external unit continues operating, the opening degree of the throttling device (preferably an electronic expansion valve) is maximized, the rotating speed of the compressor is reduced to the lowest value set in a program (different rotating speed values of a refrigeration mode and a heating mode are possible), the rotating speed of the compressor is reduced to reduce the pressure in the system, so that a refrigerant can enter an outdoor unit heat exchanger more easily, and the refrigerant can be recovered more fully. When the rotating speed of the compressor reaches a target value, the operation mode is judged to be refrigeration/heating, if the operation mode is refrigeration before shutdown, the first control valve 41 is closed, because the compressor is still running, all refrigerants in the indoor side pipeline can flow into the pipeline on the outdoor side, the second control valve 42 is closed after 1min of air receiving, the outdoor unit stops running after 2 seconds, at this time, no refrigerant or only a small amount of refrigerant exists in the pipeline on the indoor side, if the air conditioner is in a shutdown state, the pipeline on the indoor side is damaged, and the leakage of a small amount of refrigerant can not cause danger to personnel activities in the room. If the operation mode before shutdown is heating, the second control valve 42 is closed, and the first control valve 41 is closed after gas receiving for 1min because the compressor is still running, and the compressor stops running after 2 seconds.
In some embodiments, the control device is further configured to control the indoor unit 3 to continue to operate until the compressor 1 is turned off while the first control valve 41 is controlled to be closed or before the first control valve 41 is controlled to be closed when the refrigerant leakage signal is detected and the air conditioner is operating in the cooling mode; and is further configured to control the indoor unit 3 to continue to operate until the compressor 1 is turned off while the second control valve 42 is controlled to be closed or before the second control valve 42 is controlled to be closed when the refrigerant leakage signal is detected and when the air conditioner is operating in the heating mode. The indoor unit is controlled to continuously operate until the compressor stops when the refrigerant leakage signal is detected, and partial refrigerant leaked into indoor air can be blown away through the continuous operation of the indoor unit, so that the excessive refrigerant concentration in a local area near the indoor unit is avoided, the refrigerant concentration in a room tends to be consistent in an accelerated mode so as to be lower than an explosion limit, and the safety performance is improved.
If the air conditioner leaks air in the pipeline during operation, the controller can judge that the fluorine is deficient for protection, at the moment, the indoor unit reports an alarm to remind indoor personnel to stop a fire source and open a window in time, at the moment, the opening of the electronic expansion valve is opened to the maximum, and the rotating speed of the compressor is reduced to the lowest value set in a program. When the rotating speed of the compressor reaches a target value, the controller judges that the air conditioner is in a refrigerating/heating mode, the internal machine and the external machine are not stopped, if the leakage area is the indoor side, the internal machine continues to operate to blow away part of the refrigerant leaked to the air, the phenomenon that the concentration of the refrigerant in the local area near the indoor machine is too high is avoided, and the concentration of the refrigerant in a room is accelerated to be consistent so as to be lower than the explosion limit. If the operation mode is cooling, the first control valve 41 is closed, and since the compressor is still in operation, all the refrigerant in the indoor side pipe flows into the outdoor side pipe, and the second control valve 42 is closed after 1min of air receiving, and the indoor unit and the outdoor unit are stopped after 2 seconds. If the operation mode is heating, the second control valve 42 is closed, the first control valve 41 is closed after receiving air for 1min, and the indoor unit and the outdoor unit stop operating after 2 seconds.
In some embodiments, the air conditioner further comprises a throttling device 6, the throttling device 6 being arranged on the first pipeline 101;
the control device is further configured to control the opening degree of the throttling device 6 to be maximum when a shutdown signal or a refrigerant leakage signal is detected and before a parameter corresponding to an operation mode of the air conditioner is detected, and simultaneously control the rotating speed of the compressor 1 to be reduced to a target value; and when the rotating speed of the compressor 1 is reduced to a target value, detecting a parameter corresponding to the running mode of the air conditioner.
This is a further preferable control means of the present disclosure when the shutdown signal or the refrigerant leakage signal is detected and before the operation mode is detected, which can introduce the refrigerant back to the outdoor unit at the maximum flow rate by adjusting the opening degree of the throttle device to the maximum, and can reduce the pressure of the outdoor unit by reducing the rotation speed of the compressor to a target value, so that the refrigerant can more easily enter the outdoor unit.
In some embodiments, the first preset time t1 is 1 min; the second preset time t2 is 1 min; the third preset time t3 is 2 s; the second preset time t2 is 2 s.
The present disclosure also provides a control method of an air conditioner for preventing leakage of refrigerant as set forth in any one of the above, comprising:
detecting whether a signal related to machine signal or refrigerant leakage and detecting a parameter corresponding to an operation mode of the air conditioner;
judging whether the operation mode of the air conditioner is a cooling mode or a heating mode;
a control step of, when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in a cooling mode, first controlling the first control valve 41 to close, maintaining the second control valve 42 to continue to open for a first preset time t1, and closing the second control valve 42 after t 1; when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in the heating mode, the second control valve 42 is first controlled to be closed, the first control valve 41 is maintained to be opened continuously for a second preset time t2, and the first control valve 41 is closed after t 2.
According to the air conditioner, two electronic valves are added on the two stop valves on the basis of a traditional air conditioner outdoor unit, the outdoor unit controller is used for controlling the two stop valves, when the air conditioner receives a shutdown signal, the refrigerant of the indoor unit is transferred to the outdoor unit by opening and closing the stop valves, and the possibility of indoor side refrigerant leakage in a shutdown state is eliminated. The refrigerant leakage prevention function can be started after the system is judged to have the air leakage condition in the running process of the air conditioner, and the residual refrigerant is transferred to an outdoor pipeline from the indoor side by utilizing the opening and closing of the electronic valve, so that the refrigerant can be effectively prevented from being leaked to the indoor side in a large amount. The present disclosure can effectively prevent the indoor side of the flammable and explosive refrigerant from leaking in a large amount, so that the air conditioner can adopt the environment-friendly flammable and explosive hydrocarbon refrigerant.
In some embodiments, the controlling step may further include controlling to maintain the compressor 1 to be continuously turned on for the first preset time t1 after controlling the first control valve 41 to be turned off when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner is operated in a cooling mode; the controlling step may further control to maintain the compressor 1 to be continuously turned on for the second preset time t2 after the second control valve 42 is controlled to be turned off when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner operates in the heating mode.
The control method is a further preferable control form of the present disclosure, namely when a shutdown signal and a refrigerant leakage signal are detected and in a refrigeration mode, after the first control valve is controlled to be closed, the compressor is controlled to be kept on for a first preset time t1, and the refrigerant of the indoor unit part can be recovered to the outdoor unit in a low-pressure suction mode through the continuous operation of the compressor, so that the refrigerant amount in the indoor unit is further effectively reduced, and the refrigerant leakage to the indoor side is reduced; similarly, when the shutdown and refrigerant leakage signals are detected and the heating mode is detected, the second control valve is controlled to be closed, the compressor is controlled to be kept on for the second preset time t2, and the refrigerant of the indoor unit part can be recycled to the outdoor unit in a low-pressure suction mode through the continuous operation of the compressor, so that the refrigerant quantity in the indoor unit is further effectively reduced, and the refrigerant leakage to the indoor side is reduced.
In some embodiments, the controlling step may further be configured to be turned off when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner is operated in a cooling mode, and after the second control valve 42 is controlled to be turned off, the compressor 1 is controlled to be kept on for a third preset time t 3; the controlling step may further include controlling to close the compressor 1 after controlling to close the first control valve 41 and after controlling to maintain the compressor 1 to be continuously turned on for a fourth preset time t4 when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner is operated in the heating mode.
The compressor is controlled to be closed after t3 is continuously maintained by detecting a shutdown or refrigerant leakage signal and in a refrigeration mode and after the second control valve is closed, so that the further suction effect on the part of the pipeline connected with the second control valve can be ensured, the refrigerant is further sucked into the compressor, and the refrigerant recovery effect is achieved; similarly, when a shutdown or refrigerant leakage signal is detected, and in a heating mode, and after the first control valve is closed, the compressor is controlled to be continuously maintained at t4 and then closed, so that the further suction effect on the part of the pipeline connected with the first control valve can be ensured, the refrigerant is further sucked into the compressor, and the refrigerant recycling effect is achieved.
In some embodiments, the controlling step can also control the indoor unit 3 to be turned off when a shutdown signal is detected, when the air conditioner is operating in the cooling mode, and simultaneously with or before the first control valve 41 is controlled to be closed; it is also possible to control the indoor unit 3 to be turned off when a shutdown signal is detected, and when the air conditioner is operating in the heating mode, and at the same time as or before the second control valve 42 is controlled to be closed. The control method is a further preferable control form when the shutdown signal is detected, namely when the shutdown signal is detected, the indoor unit stops running, so that the indoor air can be effectively prevented from flowing and exchanging heat in the indoor unit, the refrigerant is recycled to the outdoor unit as soon as possible, and the consumption of electric energy in the indoor unit is reduced.
When the air conditioner is started, the first control valve 41 and the second control valve 42 (both preferably electromagnetic valves or electronic valves) are simultaneously opened, the air conditioner normally operates, when the air conditioner receives a shutdown signal, the internal unit stops operating, the external unit continues operating, the opening degree of the throttling device (preferably an electronic expansion valve) is maximized, the rotating speed of the compressor is reduced to the lowest value set in a program (different rotating speed values of a refrigeration mode and a heating mode are possible), the rotating speed of the compressor is reduced to reduce the pressure in the system, so that a refrigerant can enter an outdoor unit heat exchanger more easily, and the refrigerant can be recovered more fully. When the rotating speed of the compressor reaches a target value, the operation mode is judged to be refrigeration/heating, if the operation mode is refrigeration before shutdown, the first control valve 41 is closed, because the compressor is still running, all refrigerants in the indoor side pipeline can flow into the pipeline on the outdoor side, the second control valve 42 is closed after 1min of air receiving, the outdoor unit stops running after 2 seconds, at this time, no refrigerant or only a small amount of refrigerant exists in the pipeline on the indoor side, if the air conditioner is in a shutdown state, the pipeline on the indoor side is damaged, and the leakage of a small amount of refrigerant can not cause danger to personnel activities in the room. If the operation mode before shutdown is heating, the second control valve 42 is closed, and the first control valve 41 is closed after gas receiving for 1min because the compressor is still running, and the compressor stops running after 2 seconds.
In some embodiments, the controlling step may further include controlling the indoor unit 3 to continue to operate until the compressor 1 is turned off while the first control valve 41 is controlled to be closed or before the first control valve 41 is controlled to be closed when the refrigerant leakage signal is detected and the air conditioner is operated in the cooling mode; the indoor unit 3 can be controlled to continuously operate until the compressor 1 is turned off while the second control valve 42 is controlled to be closed or before the second control valve 42 is controlled to be closed when the refrigerant leakage signal is detected and the air conditioner is operated in the heating mode. The indoor unit is controlled to continuously operate until the compressor stops when the refrigerant leakage signal is detected, and partial refrigerant leaked into indoor air can be blown away through the continuous operation of the indoor unit, so that the excessive refrigerant concentration in a local area near the indoor unit is avoided, the refrigerant concentration in a room tends to be consistent in an accelerated mode so as to be lower than an explosion limit, and the safety performance is improved.
If the air conditioner leaks air in the pipeline during operation, the controller can judge that the fluorine is deficient for protection, at the moment, the indoor unit reports an alarm to remind indoor personnel to stop a fire source and open a window in time, at the moment, the opening of the electronic expansion valve is opened to the maximum, and the rotating speed of the compressor is reduced to the lowest value set in a program. When the rotating speed of the compressor reaches a target value, the controller judges that the air conditioner is in a refrigerating/heating mode, the internal machine and the external machine are not stopped, if the leakage area is the indoor side, the internal machine continues to operate to blow away part of the refrigerant leaked to the air, the phenomenon that the concentration of the refrigerant in the local area near the indoor machine is too high is avoided, and the concentration of the refrigerant in a room is accelerated to be consistent so as to be lower than the explosion limit. If the operation mode is cooling, the first control valve 41 is closed, and since the compressor is still in operation, all the refrigerant in the indoor side pipe flows into the outdoor side pipe, and the second control valve 42 is closed after 1min of air receiving, and the indoor unit and the outdoor unit are stopped after 2 seconds. If the operation mode is heating, the second control valve 42 is closed, the first control valve 41 is closed after receiving air for 1min, and the indoor unit and the outdoor unit stop operating after 2 seconds.
In some embodiments, when the air conditioner further comprises a throttling device 6;
in the control step, when a shutdown signal or a refrigerant leakage signal is detected and before a parameter corresponding to an operation mode of the air conditioner is detected, the opening degree of the throttling device 6 is controlled to be maximum, and the rotating speed of the compressor 1 is controlled to be reduced to a target value; and when the rotating speed of the compressor 1 is reduced to a target value, detecting a parameter corresponding to the running mode of the air conditioner.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.
Claims (13)
1. An air conditioner for preventing leakage of refrigerant, characterized in that: the method comprises the following steps:
the outdoor heat exchanger (2) is connected with the indoor unit (3) through a first pipeline (101), the indoor unit (3) is connected with the compressor (1) through a second pipeline (102), the first pipeline (101) is provided with a first control valve (41), and the second pipeline (102) is provided with a second control valve (42);
the air conditioner further includes:
the detection device is used for detecting whether a signal related to machine signal or refrigerant leakage exists or not and detecting a parameter corresponding to the operation mode of the air conditioner;
the judging device is used for judging whether the operation mode of the air conditioner is a cooling mode or a heating mode;
the control device is used for firstly controlling the first control valve (41) to be closed and maintaining the second control valve (42) to be continuously opened for a first preset time t1 when the air conditioner operates in a cooling mode and a shutdown signal or a refrigerant leakage signal is detected, and closing the second control valve (42) after t 1; when the air conditioner operates in a heating mode, and when a shutdown signal or a refrigerant leakage signal is detected, the second control valve (42) is firstly controlled to be closed, the first control valve (41) is kept to be opened continuously for a second preset time t2, and the first control valve (41) is closed after t 2.
2. The air conditioner according to claim 1, wherein:
the control device is further configured to maintain the compressor (1) to be continuously started for the first preset time t1 when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in a refrigeration mode, and after the first control valve (41) is controlled to be closed; the control device is further configured to maintain the compressor (1) to be continuously started for the second preset time t2 when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in the heating mode, and after the second control valve (42) is controlled to be closed.
3. The air conditioner according to claim 1, wherein:
the control device is further used for controlling and maintaining the compressor (1) to be continuously started for a third preset time t3 and then to be closed when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner runs in a refrigeration mode, and after the second control valve (42) is controlled to be closed; the control device is further configured to control to maintain the compressor (1) to be continuously started for a fourth preset time t4 after the first control valve (41) is controlled to be closed and the air conditioner is operated in the heating mode when a shutdown signal or a refrigerant leakage signal is detected.
4. The air conditioner according to claim 1, wherein:
the control device is also used for controlling the indoor unit (3) to be closed when a shutdown signal is detected and when the air conditioner runs in a cooling mode, and at the same time of controlling the first control valve (41) to be closed or before controlling the first control valve (41) to be closed; and for controlling the closing of the indoor unit (3) when a shutdown signal is detected, when the air conditioner is operating in the heating mode, and simultaneously with or before controlling the closing of the second control valve (42).
5. The air conditioner according to claim 1, wherein:
the control device is also used for controlling the indoor unit (3) to continuously operate until the compressor (1) is shut down when a refrigerant leakage signal is detected and the air conditioner operates in a refrigeration mode; and the control circuit is also used for controlling the indoor unit (3) to continuously operate until the compressor (1) is shut down when a refrigerant leakage signal is detected and the air conditioner operates in the heating mode.
6. The air conditioner according to claim 1, wherein:
the air conditioner also comprises a throttling device (6), wherein the throttling device (6) is arranged on the first pipeline (101);
the control device is also used for controlling the opening degree of the throttling device (6) to be maximum and controlling the rotating speed of the compressor (1) to be reduced to a target value at the same time when a shutdown signal or a refrigerant leakage signal is detected and before a parameter corresponding to the operation mode of the air conditioner is detected; and when the rotating speed of the compressor (1) is reduced to a target value, detecting a parameter corresponding to the running mode of the air conditioner.
7. The air conditioner according to claim 3, wherein:
the first preset time t1 is 1 min; the second preset time t2 is 1 min; the third preset time t3 is 2 s; the second preset time t2 is 2 s.
8. A control method of an air conditioner for preventing leakage of refrigerant according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
detecting whether a signal related to machine signal or refrigerant leakage and detecting a parameter corresponding to an operation mode of the air conditioner;
judging whether the operation mode of the air conditioner is a cooling mode or a heating mode;
a control step of, when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner is operated in a cooling mode, firstly controlling the first control valve (41) to close, maintaining the second control valve (42) to continue to open for a first preset time t1, and closing the second control valve (42) after t 1; when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner operates in the heating mode, the second control valve (42) is controlled to be closed first, the first control valve (41) is maintained to be opened continuously for a second preset time t2, and the first control valve (41) is closed after t 2.
9. The control method according to claim 8, characterized in that:
the control step can also control to maintain the compressor (1) to be continuously started for the first preset time t1 after the first control valve (41) is controlled to be closed when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner operates in a refrigeration mode; the controlling step can also control to maintain the compressor (1) to be continuously started for the second preset time t2 after the second control valve (42) is controlled to be closed when a shutdown signal or a refrigerant leakage signal is detected and the air conditioner operates in the heating mode.
10. The control method according to claim 8, characterized in that:
the control step can also be carried out when a shutdown signal or a refrigerant leakage signal is detected, when the air conditioner operates in a refrigeration mode, and after the second control valve (42) is controlled to be closed, the compressor (1) is controlled to be kept on for a third preset time t3 and then to be closed; the controlling step can also be performed when a shutdown signal or a refrigerant leakage signal is detected, and when the air conditioner operates in the heating mode, and after the first control valve (41) is controlled to be closed, the compressor (1) is controlled to be kept on for a fourth preset time t4 and then to be closed.
11. The control method according to claim 8, characterized in that:
the control step can also control the indoor unit (3) to be closed when a shutdown signal is detected, and when the air conditioner runs in a cooling mode, and at the same time of controlling the first control valve (41) to be closed or before controlling the first control valve (41) to be closed; and is also capable of controlling the closing of the indoor unit (3) when a shutdown signal is detected, and when the air conditioner is operating in the heating mode, and simultaneously with or before controlling the closing of the second control valve (42).
12. The control method according to claim 8, characterized in that:
the control step can also be used for controlling the indoor unit (3) to continuously operate until the compressor (1) is shut down when a refrigerant leakage signal is detected and the air conditioner operates in a refrigeration mode; and when a refrigerant leakage signal is detected and the air conditioner operates in a heating mode, the indoor unit (3) is controlled to continuously operate until the compressor (1) is shut down.
13. The control method according to claim 8, characterized in that:
when the air conditioner further comprises a throttling device (6);
the control step is that when a shutdown signal or a refrigerant leakage signal is detected and before a parameter corresponding to an operation mode of the air conditioner is detected, the opening degree of the throttling device (6) is controlled to be maximum, and meanwhile, the rotating speed of the compressor (1) is controlled to be reduced to a target value; and when the rotating speed of the compressor (1) is reduced to a target value, detecting a parameter corresponding to the running mode of the air conditioner.
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| CN202110603085.2A CN113339883A (en) | 2021-05-31 | 2021-05-31 | Air conditioner for preventing refrigerant leakage and control method thereof |
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| WO2023246779A1 (en) * | 2022-06-23 | 2023-12-28 | 青岛海尔空调电子有限公司 | Refrigerant leakage control method and system for air conditioner, and air conditioner |
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