CN110940056A - Air conditioner capable of defrosting without stopping machine and control method thereof - Google Patents
Air conditioner capable of defrosting without stopping machine and control method thereof Download PDFInfo
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- CN110940056A CN110940056A CN201911032201.9A CN201911032201A CN110940056A CN 110940056 A CN110940056 A CN 110940056A CN 201911032201 A CN201911032201 A CN 201911032201A CN 110940056 A CN110940056 A CN 110940056A
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- defrosting
- outdoor heat
- port
- air conditioner
- heat exchanger
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor 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
- F24F11/62—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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- 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
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- 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
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- 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
Abstract
The invention discloses an air conditioner without defrosting and a control method thereof, wherein the air conditioner comprises an indoor unit and an outdoor unit, the indoor unit comprises an indoor heat exchanger, the outdoor unit comprises a compressor, a four-way reversing valve and a plurality of groups of outdoor heat exchange systems, and each group of outdoor heat exchange systems comprises a throttling mechanism, an outdoor heat exchanger and a three-way valve which are connected in sequence; when the outdoor heat exchanger needs to be defrosted in the heating operation process of the air conditioner, one group of outdoor heat exchange systems can be controlled to be in a defrosting state, and the other groups of outdoor heat exchange systems are in a heating state, so that the indoor heat exchanger can still perform heating operation in the defrosting process of the outdoor heat exchanger, and the thermal comfort of the use space of the air conditioner is guaranteed.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner for defrosting without shutdown and a control method thereof.
Background
When the air conditioner is in heating operation, frost can be formed on the outdoor heat exchanger, and the frost on the outdoor heat exchanger can reduce the heat exchange efficiency of the outdoor heat exchanger and influence the heating effect of the air conditioner, so that the frost attached to the outdoor heat exchanger needs to be melted.
When the air conditioner in the prior art defrosts the outdoor heat exchanger, the four-way reversing valve is usually required to be switched to the refrigeration mode, but when the outdoor heat exchanger is defrosted by using the method, the air conditioner stops heating, and indoor thermal comfort cannot be guaranteed in the defrosting process.
Disclosure of Invention
The invention aims to provide an air conditioner for defrosting without shutdown and a control method thereof, and aims to solve the technical problems that the air conditioner stops heating when an outdoor heat exchanger is defrosted, and the indoor thermal comfort cannot be ensured.
In order to achieve the purpose, the invention adopts the following technical scheme,
an air conditioner without defrosting is disclosed, which comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises an indoor heat exchanger, and the outdoor unit comprises a compressor, a four-way reversing valve and a plurality of groups of outdoor heat exchange systems; the air suction port of the compressor is connected with the first port of the four-way reversing valve, and the air exhaust port of the compressor is connected with the fourth port of the four-way reversing valve; the third port of the four-way reversing valve is connected with the indoor heat exchanger; each group of outdoor heat exchange systems comprises a throttling mechanism, an outdoor heat exchanger and a three-way valve which are connected in sequence; the throttling structure is connected with the indoor heat exchanger, the outdoor heat exchanger is connected with a first port of the three-way valve, a second port of the three-way valve is connected with a second port of the four-way reversing valve, and a third port of the three-way valve is connected with a third port of the four-way reversing valve.
The invention relates to an air conditioner for defrosting without shutdown, wherein an outdoor unit comprises a compressor, a four-way reversing valve and a plurality of groups of outdoor heat exchange systems, and each group of outdoor heat exchange systems comprises a throttling mechanism, an outdoor heat exchanger and a three-way valve which are sequentially connected; when the outdoor heat exchanger needs to be defrosted in the heating operation process of the air conditioner, one group of outdoor heat exchange systems can be controlled to be in a defrosting state, and the other groups of outdoor heat exchange systems are in a heating state, so that the indoor heat exchanger can still perform heating operation in the defrosting process of the outdoor heat exchanger, and the thermal comfort of the use space of the air conditioner is guaranteed.
Furthermore, the device also comprises a control mechanism, and the control mechanism is used for controlling the four-way reversing valve and the three-way valves to reverse.
According to the invention, the control mechanism is arranged, so that the air conditioner can control the conduction state of the four-way reversing valve and the three-way valve according to the preset condition, and further the operation mode of the air conditioner is adjusted.
Further, the compressor is a variable displacement compressor.
According to the invention, the variable displacement compressor is adopted, when the control mechanism detects that the outdoor heat exchanger needs defrosting, the control mechanism controls the running state of the compressor, the displacement of the compressor is increased, heat is provided to the indoor as much as possible before the heat exchanger defrosts, and the indoor thermal comfort is prevented from being influenced in the defrosting process of the heat exchanger; in the defrosting process of the heat exchanger, because the area of the heat exchanger used for absorbing heat outdoors is reduced and part of refrigerant is used for melting frost on the outdoor heat exchanger, the heat provided by the indoor heat exchanger is reduced, and the thermal comfort of the indoor space can be ensured by continuously increasing the discharge capacity of the compressor at the moment.
Furthermore, when the air conditioner operates in a refrigerating mode, the first port and the third port of the four-way reversing valve are communicated, and the second port and the fourth port of the four-way reversing valve are communicated; the first ports of all three-way valves are communicated with the second ports.
Furthermore, when the air conditioner is in heating operation, a first port and a second port of the four-way reversing valve are communicated, and a third port and a fourth port of the four-way reversing valve are communicated; the first ports of all the three-way valves are communicated with the third ports.
Furthermore, when the air conditioner heats and defrosts the outdoor heat exchanger, the first port and the second port of the four-way reversing valve are communicated, and the third port and the fourth port of the four-way reversing valve are communicated; and the first port and the second port of the three-way valve connected with the outdoor heat exchanger which does not defrost are communicated.
The invention controls the flow direction of the refrigerant by controlling the conduction direction of the four-way reversing valve and the three-way valve, thereby enabling the air conditioner to be in a refrigeration or heating operation mode; when the air conditioner heats and defrosts the outdoor heat exchanger, the three-way valve connected with the outdoor heat exchanger which defrosts is controlled, and the three-way valve connected with the outdoor heat exchanger which does not defrosts adopts different communication modes, so that when partial outdoor heat exchanger is defrosted, the rest outdoor heat exchangers are in a heating operation state.
The invention also provides a control method of the air conditioner without stopping defrosting, which is used for the air conditioner without stopping defrosting and comprises the following steps:
controlling the heating operation of the air conditioner;
judging whether the air conditioner receives a shutdown signal or not;
if the air conditioner does not receive the shutdown signal, judging whether the outdoor heat exchanger needs defrosting;
if the outdoor heat exchanger needs defrosting, controlling one group of outdoor heat exchange systems to be in a defrosting state, and controlling the other groups of outdoor heat exchange systems to be in a heating state;
and after all the outdoor heat exchangers are controlled to sequentially finish defrosting, all the outdoor heat exchange systems are switched to be in a heating state.
The air conditioner control method for defrosting without shutdown comprises the steps of firstly judging whether the air conditioner receives a shutdown signal when the air conditioner is in heating operation, judging whether the outdoor heat exchanger needs defrosting if the shutdown signal is not received, controlling one group of outdoor heat exchange systems to be in a defrosting state and controlling the other groups of outdoor heat exchange systems to be in a heating state if the outdoor heat exchanger needs defrosting, so that the indoor heat exchanger can still perform heating operation in the defrosting process of the outdoor heat exchanger, and the thermal comfort of a use space of the air conditioner is guaranteed. After all the outdoor heat exchangers are controlled to sequentially finish defrosting, all the outdoor heat exchange systems are switched to be in a heating state, so that the outdoor heat exchangers can finish defrosting treatment, the running process of the air conditioner is optimized, and the heating effect of the air conditioner is improved.
Further, when the outdoor heat exchange system is in a defrosting state, a first port and a third port of a three-way valve in the outdoor heat exchange system in the defrosting state are communicated, and the throttling mechanism is kept in a fully open state.
The invention controls the flowing direction of the refrigerant in the three-way valve to make the outdoor heat exchange system in a defrosting state; the throttling mechanism is kept fully open, the flow of the refrigerant passing through the outdoor heat exchange system in a defrosting state can be maximized, quick defrosting is facilitated, and the working efficiency of the air conditioner is improved.
Further, if the air conditioner receives a shutdown signal, the outdoor ambient temperature is determined:
if the outdoor environment temperature is less than or equal to 0 ℃, the four-way reversing valve is switched to a refrigerating running state, the outdoor heat exchangers defrost, and the air conditioner is controlled to be shut down after all the outdoor heat exchangers defrost;
if the outdoor environment temperature is higher than 0 ℃, the air conditioner is controlled to be shut down.
When the air conditioner receives the shutdown signal, whether the outdoor heat exchanger needs defrosting or not is judged according to the outdoor environment temperature, and the heating effect of the next heating operation is further ensured.
Further, the discharge capacity of the compressor is increased before the outdoor heat exchanger is judged to be defrosted and the outdoor heat exchange system does not enter a defrosting state; after the outdoor heat exchange system enters a defrosting state, the discharge capacity of the compressor is continuously increased; after the outdoor heat exchanger finishes defrosting and all the outdoor heat exchange systems are switched to a heating state, the discharge capacity of the compressor is reduced.
According to the air conditioner control method for defrosting without shutdown, when the control mechanism detects that the outdoor heat exchanger needs defrosting, the discharge capacity of the compressor is increased, heat is provided for the indoor as much as possible before the heat exchanger defrosts, and the indoor thermal comfort is prevented from being influenced in the defrosting process of the heat exchanger; in the defrosting process of the heat exchanger, because the area of the heat exchanger used for absorbing heat outdoors is reduced and part of refrigerant is used for melting frost on the outdoor heat exchanger, the heat provided by the indoor heat exchanger is reduced, and the thermal comfort of the indoor space can be ensured by continuously improving the discharge capacity of the compressor; after all the outdoor heat exchangers finish defrosting and all the outdoor heat exchange systems are switched to be in a heating state, the discharge capacity of the compressor is reduced, and the normal operation of the air conditioner can be ensured.
Drawings
FIG. 1 is a schematic structural diagram of an air conditioner with defrosting function without shutdown according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for controlling an air conditioner to defrost without shutdown according to an embodiment of the present invention.
Description of reference numerals:
1-air conditioner, 10-indoor unit, 20-outdoor unit, 30-control mechanism, 40-first indoor and outdoor connecting pipeline, 50-second indoor and outdoor connecting pipeline, 21-compressor, 22-four-way reversing valve, 23-first throttling mechanism, 24-second throttling mechanism, 25-outdoor first heat exchanger, 26-outdoor second heat exchanger, 27-outdoor first three-way valve, 28-outdoor second three-way valve
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example one
Referring to fig. 1 in combination, the present invention provides an air conditioner without defrosting, which comprises an indoor unit 10 and an outdoor unit 20, wherein the indoor unit 10 is connected with the outdoor unit 20 through a first indoor and outdoor connecting pipeline 40 and a second indoor and outdoor connecting pipeline 50, the indoor unit 10 comprises an indoor heat exchanger 11, and the outdoor unit 20 comprises a compressor 21, a four-way reversing valve 22 and a plurality of groups of outdoor heat exchange systems; the suction port of the compressor 21 is connected with the first port of the four-way reversing valve 22, and the exhaust port of the compressor 21 is connected with the fourth port of the four-way reversing valve; a third port of the four-way reversing valve 22 is connected with the indoor heat exchanger 11; each group of outdoor heat exchange systems comprises a throttling mechanism, an outdoor heat exchanger and a three-way valve which are connected in sequence; the throttling structure is connected with the indoor heat exchanger 11, the outdoor heat exchanger is connected with a first port of a three-way valve, a second port of the three-way valve is connected with a second port of the four-way reversing valve 22, and a third port of the three-way valve is connected with a third port of the four-way reversing valve 22.
The air conditioner for defrosting without shutdown comprises an outdoor unit 20, a compressor 21, a four-way reversing valve 22 and a plurality of groups of outdoor heat exchange systems, wherein each group of outdoor heat exchange systems comprises a throttling mechanism, an outdoor heat exchanger and a three-way valve which are sequentially connected; when the air conditioner 1 needs to defrost the outdoor heat exchanger in the heating operation process, one group of outdoor heat exchange systems can be controlled to be in a defrosting state, and the other groups of outdoor heat exchange systems are in a heating state, so that the indoor heat exchanger 11 can still perform heating operation in the defrosting process of the outdoor heat exchanger, and the thermal comfort of the use space of the air conditioner 1 is guaranteed.
In the present invention, in order to prevent water generated when the post-defrosted outdoor heat exchanger is defrosted from affecting the defrosted outdoor heat exchanger, such as water generated when the post-defrosted outdoor heat exchanger is defrosted being discharged to the defrosted outdoor heat exchanger, the present invention preferably defrosts sequentially from high to low according to the spatial position of the outdoor heat exchanger.
As shown in fig. 1, in the preferred embodiment of the present invention, the outdoor unit 20 of the air conditioner 1 includes two sets of outdoor heat exchange systems, the first set of outdoor heat exchange system includes a first throttling mechanism 23, an outdoor first heat exchanger 25 and an outdoor first three-way valve 27, which are connected in sequence, and the second set of outdoor heat exchange system includes a second throttling mechanism 24, an outdoor second heat exchanger 26 and an outdoor second three-way valve 28, which are connected in sequence. When the air conditioner 1 of this embodiment needs to defrost the outdoor heat exchanger in the heating operation process, the controllable first group of outdoor heat exchange system is in the defrosting state, the second group of outdoor heat exchange system is in the heating state, after the defrosting is completed by the outdoor first heat exchanger 25, the second group of outdoor heat exchange system is controlled to be in the defrosting state, and the first group of outdoor heat exchange system is in the heating state, so that the indoor heat exchanger 11 can still be heated and operated in the defrosting process by the outdoor first heat exchanger 25 or the outdoor second heat exchanger 26, and the thermal comfort of the use space of the air conditioner 1 is guaranteed.
In this embodiment, the air conditioner for defrosting without shutdown further includes a control mechanism 30, and the control mechanism 30 is used for controlling the four-way reversing valve 22 and the plurality of three-way valves to reverse.
As shown in fig. 1, the refrigerant flowing direction indicated by the solid line in the four-way selector valve 22 is the refrigerant flowing direction during cooling, and the refrigerant flowing direction indicated by the broken line in the four-way selector valve 22 is the refrigerant flowing direction during heating; the refrigerant flowing direction indicated by the solid lines in the outdoor first three-way valve 27 and the outdoor second three-way valve 28 is the refrigerant flowing direction when the air conditioner 1 is in the cooling operation or the heating operation, and the refrigerant flowing direction indicated by the broken lines in the outdoor first three-way valve 27 and the outdoor second three-way valve 28 is the refrigerant flowing direction when the air conditioner 1 is in the defrosting operation in the heating operation.
According to the invention, the control mechanism 30 is arranged, so that the air conditioner 1 can control the conduction state of the four-way reversing valve 22 and the three-way valve according to the preset condition, and further the operation mode of the air conditioner 1 is adjusted.
In the present embodiment, the compressor 21 is a variable displacement compressor.
The compressor 21 of the air conditioner for defrosting without stopping the machine is a variable displacement compressor, and the control mechanism 30 is adopted to control the displacement of the compressor 21. Before defrosting operation, the refrigerant pressure in the indoor heat exchanger 11 can be increased while the refrigerant pressure in the outdoor heat exchanger is reduced by increasing the discharge capacity of the compressor 21; the pressure and the evaporation temperature of the refrigerant in the outdoor heat exchanger can be reduced by reducing the pressure of the refrigerant in the outdoor heat exchanger, the heat exchange temperature difference between the refrigerant and outdoor air is increased, and the heat exchange capacity of the outdoor heat exchanger is improved; the refrigerant pressure in the indoor heat exchanger 11 is increased, so that the condensation pressure and the condensation temperature of the refrigerant in the indoor heat exchanger 11 can be increased, the heat exchange temperature difference between the refrigerant and the indoor air is increased, and the heat exchange capacity of the indoor heat exchanger 11 is improved; the heat exchange amount of the outdoor heat exchanger and the indoor heat exchanger 11 can be increased by increasing the refrigerant circulation amount. The heat of the indoor side is rapidly increased shortly before defrosting through the heat exchanger, and the influence on indoor thermal comfort caused by heat attenuation of the indoor heat exchanger 11 in the defrosting process of the heat exchanger is reduced. In the defrosting process of the outdoor heat exchanger, because the area of the heat exchanger for absorbing heat outdoors is reduced and part of refrigerant is used for melting frost on the outdoor heat exchanger, the heat provided by the indoor heat exchanger 11 is reduced, and at the moment, the thermal comfort of the indoor space can be ensured by continuously increasing the discharge capacity of the compressor 21.
According to the air conditioner for defrosting without shutdown, when the air conditioner 1 operates in a refrigerating mode, the first port and the third port of the four-way reversing valve 22 are communicated, and the second port and the fourth port of the four-way reversing valve 22 are communicated; the first ports of all three-way valves are communicated with the second ports.
When the air conditioner 1 is in heating operation, a first port and a second port of the four-way reversing valve 22 are communicated, and a third port and a fourth port of the four-way reversing valve 22 are communicated; the first ports of all the three-way valves are communicated with the third ports.
When the air conditioner 1 heats and defrosts the outdoor heat exchanger, the first port and the second port of the four-way reversing valve 22 are communicated, and the third port and the fourth port of the four-way reversing valve 22 are communicated; and the first port and the second port of the three-way valve connected with the outdoor heat exchanger which does not defrost are communicated.
As shown in fig. 1, in the preferred embodiment of the present invention, when the air conditioner 1 is in cooling operation, the first port of the four-way reversing valve 22 is communicated with the third port, and the second port of the four-way reversing valve 22 is communicated with the fourth port; first ports and second ports of the outdoor first three-way valve 27 and the outdoor second three-way valve 28 communicate;
when the air conditioner 1 is in heating operation, a first port and a second port of the four-way reversing valve 22 are communicated, and a third port and a fourth port of the four-way reversing valve 22 are communicated; the first ports of the outdoor first three-way valve 27 and the outdoor second three-way valve 28 communicate with the third port;
when the air conditioner 1 heats and defrosts the outdoor heat exchanger, the first port and the second port of the four-way reversing valve 22 are communicated, and the third port and the fourth port of the four-way reversing valve 22 are communicated; when the outdoor first heat exchanger 25 is subjected to defrosting treatment, the first port and the third port of the outdoor first three-way valve 27 are communicated, and the first port and the second port of the outdoor second three-way valve 28 are communicated; when the outdoor second heat exchanger 26 is subjected to defrosting treatment, the first port and the second port of the outdoor first three-way valve 27 are communicated, and the first port and the third port of the outdoor second three-way valve 28 are communicated.
The invention controls the flow direction of the refrigerant by controlling the conduction direction of the four-way reversing valve 22 and the three-way valve, thereby enabling the air conditioner 1 to be in a refrigeration or heating operation mode; when the air conditioner 1 heats and defrosts the outdoor heat exchanger, the three-way valve connected with the outdoor heat exchanger which defrosts and the three-way valve connected with the outdoor heat exchanger which does not defrosts are controlled to adopt different communication modes, so that when defrosting treatment is carried out on part of the outdoor heat exchangers, the rest outdoor heat exchangers are in a heating operation state.
Example two
The invention also provides a control method of the air conditioner without stopping defrosting, which is used for the air conditioner without stopping defrosting in the embodiment and comprises the following steps:
controlling the heating operation of the air conditioner 1;
judging whether the air conditioner 1 receives a shutdown signal;
if the air conditioner 1 does not receive the shutdown signal, judging whether the outdoor heat exchanger needs defrosting;
if the outdoor heat exchanger needs defrosting, controlling one group of outdoor heat exchange systems to be in a defrosting state, and controlling the other groups of outdoor heat exchange systems to be in a heating state;
and after all the outdoor heat exchangers are controlled to sequentially finish defrosting, all the outdoor heat exchange systems are switched to be in a heating state.
The air conditioner control method for defrosting without shutdown comprises the steps of firstly judging whether the air conditioner 1 receives a shutdown signal when the air conditioner 1 is in heating operation, judging whether an outdoor heat exchanger needs defrosting if the shutdown signal is not received, controlling one group of outdoor heat exchange systems to be in a defrosting state and controlling the other groups of outdoor heat exchange systems to be in a heating state if the outdoor heat exchanger needs defrosting, and therefore ensuring that the indoor heat exchanger 11 can still perform heating operation in the defrosting process of the outdoor heat exchanger and the thermal comfort of a use space of the air conditioner 1. After all the outdoor heat exchangers are controlled to sequentially finish defrosting, all the outdoor heat exchange systems are switched to be in a heating state, so that the outdoor heat exchangers can finish defrosting treatment, the running process of the air conditioner 1 is optimized, and the heating effect of the air conditioner 1 is improved.
In the present invention, in order to prevent water generated when the post-defrosted outdoor heat exchanger is defrosted from affecting the defrosted outdoor heat exchanger, such as water generated when the post-defrosted outdoor heat exchanger is defrosted being discharged to the defrosted outdoor heat exchanger, the present invention preferably defrosts sequentially from high to low according to the spatial position of the outdoor heat exchanger.
As shown in fig. 1 and 2, in the preferred embodiment of the present invention, the outdoor unit 20 of the air conditioner 1 includes two sets of outdoor heat exchange systems. The air conditioner control method for defrosting without shutdown specifically comprises the following steps:
controlling the heating operation of the air conditioner 1;
judging whether the air conditioner 1 receives a shutdown signal;
if the air conditioner 1 does not receive the shutdown signal, judging whether the outdoor heat exchanger needs defrosting;
if the outdoor heat exchanger needs defrosting, controlling the first group of outdoor heat exchange systems to be in a defrosting state, and controlling the second group of outdoor heat exchange systems to be in a heating state;
judging whether defrosting of the outdoor first heat exchanger 25 is finished: if the defrosting of the outdoor first heat exchanger 25 is not finished, continuously keeping the first group of outdoor heat exchange systems in a defrosting state, and keeping the second group of outdoor heat exchange systems in a heating state; if the defrosting of the outdoor first heat exchanger 25 is finished, controlling the second group of outdoor heat exchange systems to be in a defrosting state, and controlling the first group of outdoor heat exchange systems to be in a heating state;
judging whether defrosting of the outdoor second heat exchanger 26 is finished: and if the defrosting of the second heat exchanger is finished, controlling the first group of outdoor heat exchange systems and the second group of outdoor heat exchange systems to be in a heating state.
According to the air conditioner control method for defrosting without shutdown, when the outdoor heat exchange system is in a defrosting state, the first port and the third port of the three-way valve in the outdoor heat exchange system in the defrosting state are communicated, and the throttling mechanism is kept in a fully open state.
The invention controls the flowing direction of the refrigerant in the three-way valve to make the outdoor heat exchange system in a defrosting state; the throttling mechanism is kept fully open, the flow of the refrigerant passing through the outdoor heat exchange system in the defrosting state can be maximized, the rapid defrosting is facilitated, and the working efficiency of the air conditioner 1 is improved.
Preferably, if the air conditioner 1 receives the shutdown signal, the outdoor environment temperature is determined as follows:
if the outdoor environment temperature is less than or equal to 0 ℃, the four-way reversing valve 22 is switched to a refrigerating operation state, the outdoor heat exchangers are defrosted, and the air conditioner 1 is controlled to be shut down after defrosting of all the outdoor heat exchangers is finished;
if the outdoor environment temperature is higher than 0 ℃, the air conditioner 1 is controlled to be shut down.
Preferably, when the air conditioner 1 receives the shutdown signal, the air conditioner determines whether the outdoor heat exchanger needs defrosting according to the outdoor environment temperature, so as to ensure the heating effect of the next heating operation.
According to the invention, preferably, before the outdoor heat exchanger is judged to be defrosted and the outdoor heat exchange system does not enter a defrosting state, the discharge capacity of the compressor 21 is increased; after the outdoor heat exchange system enters a defrosting state, the discharge capacity of the compressor 21 is continuously increased; after all the outdoor heat exchangers finish defrosting and all the outdoor heat exchange systems are switched to a heating state, the discharge capacity of the compressor 21 is reduced to a normal operation state.
According to the air conditioner control method for defrosting without shutdown, when the control mechanism 30 detects that the outdoor heat exchanger needs defrosting, the discharge capacity of the compressor 21 is increased, heat is provided to the indoor as much as possible before the heat exchanger defrosts, and the indoor thermal comfort is prevented from being influenced in the defrosting process of the heat exchanger; in the defrosting process of the heat exchanger, because the area of the heat exchanger used for absorbing heat outdoors is reduced and part of refrigerant is used for melting frost on the outdoor heat exchanger, the heat provided by the indoor heat exchanger 11 is reduced, the discharge capacity of the compressor 21 is continuously improved, and the thermal comfort of an indoor space can be ensured; after all the outdoor heat exchangers finish defrosting and all the outdoor heat exchange systems are switched to a heating state, the discharge capacity of the compressor 21 is reduced, so that the normal operation of the air conditioner 1 can be ensured.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An air conditioner without defrosting operation, comprising an indoor unit (10) and an outdoor unit (20), wherein the indoor unit (10) comprises an indoor heat exchanger (11),
the outdoor unit (20) comprises a compressor (21), a four-way reversing valve (22) and a plurality of groups of outdoor heat exchange systems; the suction port of the compressor (21) is connected with the first port of the four-way reversing valve (22), and the exhaust port of the compressor (21) is connected with the fourth port of the four-way reversing valve (22); the third port of the four-way reversing valve (22) is connected with the indoor heat exchanger (11);
each group of outdoor heat exchange systems comprises a throttling mechanism, an outdoor heat exchanger and a three-way valve which are connected in sequence; the throttling structure is connected with the indoor heat exchanger (11), the outdoor heat exchanger is connected with a first port of the three-way valve, a second port of the three-way valve is connected with a second port of the four-way reversing valve (22), and a third port of the three-way valve is connected with a third port of the four-way reversing valve (22).
2. The non-stop defrosting air conditioner of claim 1,
the device also comprises a control mechanism (30), wherein the control mechanism (30) is used for controlling the four-way reversing valve (22) and the three-way valves to reverse.
3. The non-stop defrosting air conditioner of claim 2,
the compressor (21) is a variable displacement compressor (21).
4. The non-stop defrosting air conditioner according to any one of claims 1 to 3,
when the air conditioner operates in a refrigerating mode, a first port of the four-way reversing valve (22) is communicated with a third port, and a second port of the four-way reversing valve (22) is communicated with a fourth port; the first ports of all three-way valves are communicated with the second ports.
5. The non-stop defrosting air conditioner according to any one of claims 1 to 3,
when the air conditioner is in heating operation, a first port and a second port of the four-way reversing valve (22) are communicated, and a third port and a fourth port of the four-way reversing valve (22) are communicated; the first ports of all the three-way valves are communicated with the third ports.
6. The non-stop defrosting air conditioner according to any one of claims 1 to 3,
when the air conditioner heats and defrosts the outdoor heat exchanger, a first port and a second port of the four-way reversing valve (22) are communicated, and a third port and a fourth port of the four-way reversing valve (22) are communicated; and the first port and the second port of the three-way valve connected with the outdoor heat exchanger which does not defrost are communicated.
7. A control method of an air conditioner without defrosting, for the air conditioner without defrosting in accordance with any one of claims 1 to 3, comprising the steps of:
controlling the heating operation of the air conditioner;
judging whether the air conditioner receives a shutdown signal or not;
if the air conditioner does not receive the shutdown signal, judging whether the outdoor heat exchanger needs defrosting;
if the outdoor heat exchanger needs defrosting, controlling one group of outdoor heat exchange systems to be in a defrosting state, and controlling the other groups of outdoor heat exchange systems to be in a heating state;
and after all the outdoor heat exchangers are controlled to sequentially finish defrosting, all the outdoor heat exchange systems are switched to be in a heating state.
8. The control method of an air conditioner for defrosting without shutdown as set forth in claim 7,
when the outdoor heat exchange system is in a defrosting state, a first port and a third port of a three-way valve in the outdoor heat exchange system in the defrosting state are communicated, and the throttling mechanism is kept in a fully open state.
9. The method for controlling the air conditioner without shutdown for defrosting according to claim 7 or 8, wherein if the air conditioner receives the shutdown signal, the outdoor environment temperature is judged as follows:
if the outdoor environment temperature is less than or equal to 0 ℃, the four-way reversing valve (22) is switched to a refrigerating running state, the outdoor heat exchanger carries out defrosting, and the air conditioner is controlled to be shut down after the outdoor heat exchanger finishes defrosting;
if the outdoor environment temperature is higher than 0 ℃, the air conditioner is controlled to be shut down.
10. The control method of an air conditioner for defrosting without shutdown as set forth in claim 7 or 8, characterized in that before it is judged that the outdoor heat exchanger needs defrosting and the outdoor heat exchange system does not enter the defrosting state, the displacement of the compressor (21) is increased;
after the outdoor heat exchange system enters a defrosting state, the discharge capacity of the compressor (21) is continuously increased;
after all the outdoor heat exchangers finish defrosting and all the outdoor heat exchange systems are switched to be in a heating state, the discharge capacity of the compressor (21) is reduced.
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| CN201911032201.9A CN110940056A (en) | 2019-10-28 | 2019-10-28 | Air conditioner capable of defrosting without stopping machine and control method thereof |
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