CN110542176A - Defrosting control system and method for air conditioner, air conditioner and readable storage medium - Google Patents
Defrosting control system and method for air conditioner, air conditioner and readable storage medium Download PDFInfo
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- CN110542176A CN110542176A CN201910884443.4A CN201910884443A CN110542176A CN 110542176 A CN110542176 A CN 110542176A CN 201910884443 A CN201910884443 A CN 201910884443A CN 110542176 A CN110542176 A CN 110542176A
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- air conditioner
- pressure
- defrosting
- difference
- fan
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
Abstract
The invention provides a defrosting control system and a method of an air conditioner, the air conditioner and a readable storage medium, wherein the defrosting control system of the air conditioner comprises a memory and a processor, and the memory is configured to be suitable for storing a computer program; the processor is configured to be adapted to execute the computer program to implement: acquiring pressure information of the air conditioner based on an exit signal corresponding to the defrosting mode; and controlling a fan of the air conditioner according to the pressure information. According to the invention, based on the pressure information of each refrigerant pipeline in the air conditioner, whether the four-way valve of the air conditioner is reversed or not can be accurately judged when the air conditioner exits the defrosting mode, and the fan of the air conditioner is started after the four-way valve is reversed, so that the problem that the four-way valve is failed to be reversed due to the reduction of the pressure difference caused by the early starting of the fan can be effectively avoided, the condition of fault shutdown caused by the defrosting mode is effectively reduced, and the reliability and the stability of the operation of the air conditioner are further improved.
Description
Technical Field
The invention relates to the technical field of air conditioner defrosting, in particular to a defrosting control system of an air conditioner, a defrosting control method of the air conditioner, the air conditioner and a computer readable storage medium.
Background
generally, a reverse cycle defrosting method is commonly used in a defrosting method of an air conditioner of an air source heat pump unit, namely, a four-way valve is reversed to defrost. For the reverse circulation defrosting method, when the defrosting mode is exited at a low environmental temperature, if the starting time of the fan is unreasonable, the operation of the air conditioner is affected. Specifically, if the fan is turned on too early, the high pressure on the exhaust side of the air conditioner will be reduced rapidly, and the high-low pressure difference is reduced below the minimum switching pressure difference of the four-way valve, which will result in the failure of the four-way valve switching and cause the fault shutdown.
Disclosure of Invention
the present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention proposes a defrost control system of an air conditioner.
a second aspect of the present invention provides a defrosting control method for an air conditioner.
A third aspect of the present invention provides an air conditioner.
a fourth aspect of the present invention is directed to a computer-readable storage medium.
In view of the above, a first aspect of the present invention provides a defrost control system for an air conditioner, comprising a memory and a processor, the memory being configured and adapted to store a computer program; the processor is configured to be adapted to execute the computer program to implement: acquiring pressure information of the air conditioner based on an exit signal corresponding to the defrosting mode; and controlling a fan of the air conditioner according to the pressure information.
in the technical scheme, when the air conditioner exits the defrosting mode, the four-way valve can influence the pressure of a refrigerant pipeline of the air conditioner in a reversing way, whether the four-way valve of the air conditioner is completely reversed or not can be accurately judged by pressure information of each refrigerant pipeline in the air conditioner when the air conditioner exits the defrosting mode, and a fan of the air conditioner is started after the four-way valve is completely reversed, so that the problem that the four-way valve fails in reversing due to the fact that the pressure difference is reduced because the fan is started in advance can be effectively avoided, the condition of fault shutdown caused by the defrosting mode is effectively reduced, and the reliability and the stability of the operation of the air conditioner are improved.
in addition, the defrosting control system in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, further, the processor executes the computer program to realize the step of acquiring the pressure information of the air conditioner, which specifically includes: acquiring the exhaust pressure and the suction pressure of a compressor of the air conditioner, and acquiring the fin pressure of the air conditioner; the processor executes the computer program to realize the step of controlling the fan of the air conditioner according to the pressure information, and the method specifically comprises the following steps: calculating a first difference value between the exhaust pressure and the pressure of the fins, and calculating a second difference value between the suction pressure and the pressure of the fins; and controlling the fan to start based on the first difference value being larger than the first difference value threshold and the second difference value being smaller than the second difference value threshold.
In the technical scheme, the pressure information of the air conditioner comprises the discharge pressure and the suction pressure of a compressor and the pressure of fins of the air conditioner. When the pressure difference between the exhaust pressure and the pressure of the fins, namely the first difference value is larger than the preset first difference value threshold value, and the pressure difference between the suction pressure and the pressure of the fins, namely the second difference value is smaller than the preset second difference value threshold value, the four-way valve is completely reversed, the fan is controlled to start up at the moment, the reversing failure of the four-way valve cannot be caused, and the air conditioner can safely exit the defrosting mode.
In any of the above technical solutions, further, the fin pressure is specifically: line pressure between the compressor to the outdoor heat exchanger of the air conditioner.
in the technical scheme, the pressure value of the fin pressure is different according to different conduction states of the four-way valve, and specifically, when the air conditioner operates in a refrigeration mode and/or a defrosting mode, the fin pressure of the air conditioner is specifically the pressure of a pipeline from an exhaust pipeline of the compressor to a fin of a heat exchanger of the air conditioner. When the air conditioner runs in a heating mode, the pressure of the fins of the air conditioner is specifically the pressure of a pipeline between an air suction pipeline of the compressor and heat exchange fins of the air conditioner.
In any of the above technical solutions, further, before the step of obtaining the pressure information of the air conditioner, the processor is further configured to execute a computer program to implement: controlling the four-way valve of the air conditioner to switch states to enter a defrosting mode and controlling a fan to be turned off based on a defrosting starting signal; and controlling the four-way valve to switch the state again to exit the defrosting mode based on the exit signal.
In the technical scheme, the air conditioner can judge whether frosting occurs according to the weight of the outdoor heat exchanger, the temperature of the outdoor heat exchanger and the pipeline pressure value of the outdoor heat exchanger or by setting an image acquisition device, an infrared sensor and the like, when frosting occurs, a defrosting starting signal is generated, the four-way valve is controlled to be in a switching state based on the defrosting starting signal, and at the moment, the air conditioner enters a defrosting mode. When the defrosting end condition is met, the system generates an exit signal corresponding to the defrosting mode, at the moment, the four-way valve is controlled to switch the state again, and the air conditioner recovers the normal running mode.
In any of the above technical solutions, further, a value range of the first difference threshold is: 1.0bar to 50 bar; the value range of the second difference threshold is as follows: 0bar to 1.0 bar.
further, the value range of the first difference threshold is as follows: 1.0bar to 30 bar.
Further, the value range of the first difference threshold is as follows: 1.0bar to 5.0 bar.
Further, the value range of the first difference threshold is as follows: 1.0bar to 3.0 bar.
A second aspect of the present invention provides a defrosting control method of an air conditioner, including: acquiring pressure information of the air conditioner based on an exit signal corresponding to the defrosting mode; and controlling a fan of the air conditioner according to the pressure information.
In the technical scheme, when the air conditioner exits the defrosting mode, the four-way valve can influence the pressure of a refrigerant pipeline of the air conditioner in a reversing way, whether the four-way valve of the air conditioner is completely reversed or not can be accurately judged by pressure information of each refrigerant pipeline in the air conditioner when the air conditioner exits the defrosting mode, and a fan of the air conditioner is started after the four-way valve is completely reversed, so that the problem that the four-way valve fails in reversing due to the fact that the pressure difference is reduced because the fan is started in advance can be effectively avoided, the condition of fault shutdown caused by the defrosting mode is effectively reduced, and the reliability and the stability of the operation of the air conditioner are improved.
In the above technical solution, further, the step of obtaining the pressure information of the air conditioner specifically includes: acquiring the exhaust pressure and the suction pressure of a compressor of the air conditioner, and acquiring the fin pressure of the air conditioner; the step of controlling the fan of the air conditioner according to the pressure information specifically comprises the following steps: calculating a first difference value between the exhaust pressure and the pressure of the fins, and calculating a second difference value between the suction pressure and the pressure of the fins; and controlling the fan to start based on the first difference value being larger than the first difference value threshold and the second difference value being smaller than the second difference value threshold.
In the technical scheme, the pressure information of the air conditioner comprises the discharge pressure and the suction pressure of a compressor and the pressure of fins of the air conditioner. When the pressure difference between the exhaust pressure and the pressure of the fins, namely the first difference value is larger than the preset first difference value threshold value, and the pressure difference between the suction pressure and the pressure of the fins, namely the second difference value is smaller than the preset second difference value threshold value, the four-way valve is completely reversed, the fan is controlled to start up at the moment, the reversing failure of the four-way valve cannot be caused, and the air conditioner can safely exit the defrosting mode.
In any of the above technical solutions, further, the fin pressure is specifically: to the line pressure between the outdoor heat exchangers of the air conditioner.
In the technical scheme, the pressure value of the fin pressure is different according to different conduction states of the four-way valve, and specifically, when the air conditioner operates in a refrigeration mode and/or a defrosting mode, the fin pressure of the air conditioner is specifically the pressure of a pipeline from an exhaust pipeline of the compressor to a fin of a heat exchanger of the air conditioner. When the air conditioner runs in a heating mode, the pressure of the fins of the air conditioner is specifically the pressure of a pipeline between an air suction pipeline of the compressor and heat exchange fins of the air conditioner.
in any of the above technical solutions, further, before the step of obtaining pressure information of the air conditioner, the defrosting control method further includes: controlling the four-way valve of the air conditioner to switch states to enter a defrosting mode and controlling a fan to be turned off based on a defrosting starting signal; and controlling the four-way valve to switch the state again to exit the defrosting mode based on the exit signal.
in the technical scheme, the air conditioner can judge whether frosting occurs according to the weight of the outdoor heat exchanger, the temperature of the outdoor heat exchanger and the pipeline pressure value of the outdoor heat exchanger or by setting an image acquisition device, an infrared sensor and the like, when frosting occurs, a defrosting starting signal is generated, the four-way valve is controlled to be in a switching state based on the defrosting starting signal, and at the moment, the air conditioner enters a defrosting mode. When the defrosting end condition is met, the system generates an exit signal corresponding to the defrosting mode, at the moment, the four-way valve is controlled to switch the state again, and the air conditioner recovers the normal running mode.
In any of the above technical solutions, further, a value range of the first difference threshold is: 1.0bar to 50 bar; the value range of the second difference threshold is as follows: 0bar to 1.0 bar.
Further, the value range of the first difference threshold is as follows: 1.0bar to 30 bar.
further, the value range of the first difference threshold is as follows: 1.0bar to 5.0 bar.
further, the value range of the first difference threshold is as follows: 1.0bar to 3.0 bar.
A third aspect of the present invention provides an air conditioner, where the air conditioner includes the defrosting control system of the air conditioner provided in any one of the above technical solutions, and therefore, the air conditioner includes all the beneficial effects of the defrosting control system of the air conditioner provided in any one of the above technical solutions, which are not described herein again.
a fourth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the defrosting control method for an air conditioner as provided in any one of the above technical solutions, and therefore, the computer-readable storage medium includes all the beneficial effects of the defrosting control method for an air conditioner as provided in any one of the above technical solutions, and is not described herein again.
Drawings
the above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Fig. 1 is a block diagram illustrating a defrost control system of an air conditioner according to an embodiment of the present invention;
Fig. 2 is a schematic view showing a structure of an air source heat pump system to which a defrost control system of an air conditioner is applied according to an embodiment of the present invention;
Fig. 3 is a flowchart illustrating a defrost control method of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a defrost control method of an air conditioner according to another embodiment of the present invention;
Fig. 5 is a flowchart illustrating a defrost control method of an air conditioner according to still another embodiment of the present invention;
fig. 6 is a flowchart illustrating a defrost control method of an air conditioner according to still another embodiment of the present invention;
Fig. 7 is a flowchart illustrating a complete control logic of a defrost control method of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
a defrost control system of an air conditioner, a defrost control method of an air conditioner, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 7.
The first embodiment is as follows:
As shown in fig. 1, in an embodiment of a first aspect of the present invention, there is provided a defrost control system 100 for an air conditioner, comprising a memory 102 and a processor 104, the memory 102 being configured and adapted to store a computer program; the processor 104 is configured as a computer program adapted to execute to implement: acquiring pressure information of the air conditioner based on an exit signal corresponding to the defrosting mode; and controlling a fan of the air conditioner according to the pressure information.
The processor 104 executes the computer program to realize the step of acquiring the pressure information of the air conditioner, which specifically includes: acquiring the exhaust pressure and the suction pressure of a compressor of the air conditioner, and acquiring the fin pressure of the air conditioner; the processor executes the computer program to realize the step of controlling the fan of the air conditioner according to the pressure information, and the method specifically comprises the following steps: calculating a first difference value between the exhaust pressure and the pressure of the fins, and calculating a second difference value between the suction pressure and the pressure of the fins; and controlling the fan to start based on the first difference value being larger than the first difference value threshold and the second difference value being smaller than the second difference value threshold.
The fin pressure is specifically as follows: to the line pressure between the outdoor heat exchangers of the air conditioner.
Prior to the step of obtaining pressure information of the air conditioner, the processor 104 is further configured to execute a computer program to: controlling the four-way valve of the air conditioner to switch states to enter a defrosting mode and controlling a fan to be turned off based on a defrosting starting signal; and controlling the four-way valve to switch the state again to exit the defrosting mode based on the exit signal.
The value range of the first difference threshold is as follows: 1.0bar to 50 bar; the value range of the second difference threshold is as follows: 0bar to 1.0 bar.
further, the value range of the first difference threshold is as follows: 1.0bar to 30 bar.
Further, the value range of the first difference threshold is as follows: 1.0bar to 5.0 bar.
further, the value range of the first difference threshold is as follows: 1.0bar to 3.0 bar.
In the above embodiment of the present invention, when exiting the defrost mode, the reversing of the four-way valve may affect the pressure of the refrigerant pipeline of the air conditioner, and based on the pressure information of each refrigerant pipeline in the air conditioner, it may be accurately determined whether the four-way valve of the air conditioner has been reversed when exiting the defrost mode.
The corresponding sensors can be arranged to obtain the suction pressure of the compressor, the discharge pressure of the compressor and the corresponding fin pressure.
Specifically, the pressure information of the air conditioner includes a discharge pressure of the compressor, a suction pressure, and a fin pressure of the air conditioner. When the pressure difference between the exhaust pressure and the pressure of the fins, namely the first difference value is larger than the preset first difference value threshold value, and the pressure difference between the suction pressure and the pressure of the fins, namely the second difference value is smaller than the preset second difference value threshold value, the four-way valve is completely reversed, the fan is controlled to start up at the moment, the reversing failure of the four-way valve cannot be caused, and the air conditioner can safely exit the defrosting mode.
The air conditioner is internally provided with a plurality of pressure sensors, specifically, as shown in fig. 2, an air source heat pump system is arranged in a refrigerant circulation path of the air source heat pump system, and the main structure of the air source heat pump system comprises a compressor, a four-way valve, a shell tube and fins, wherein the shell tube is connected with a water tank through a pipeline, and solutions such as water or ethylene glycol are arranged in the pipeline. The fins are in contact with the air, and the fins are equivalent to an outdoor heat exchanger. The pressure sensor includes: and the air suction sensor is arranged at the air suction port of the compressor and is used for acquiring air suction pressure. And the exhaust sensor is arranged at the exhaust port of the compressor and is used for acquiring exhaust pressure. And the fin sensor is arranged between the four-way valve and the fins and is used for acquiring the pressure of the fins.
when the air source heat pump system operates in a heating mode, the four-way valve is in a conduction state of 1-4 and 2-3, and the fin pressure sensor is connected between the air suction port and the fins of the compressor, so that the fin pressure at the moment is close to the air suction pressure.
When the air source heat pump system operates in a refrigeration mode or a defrosting mode, the conduction state of the four-way valve is 1-2 conduction, 4-3 conduction, and at the moment, the fin pressure sensor is equivalently connected between the exhaust port and the fins of the compressor, so that the pressure of the fins is close to the exhaust pressure at the moment.
according to the embodiment of the invention, based on the pressure information of each refrigerant pipeline in the air conditioner, whether the four-way valve of the air conditioner is reversed or not can be accurately judged when the air conditioner exits the defrosting mode, and the fan of the air conditioner is started after the four-way valve is reversed, so that the problem of reversing failure of the four-way valve due to pressure difference reduction caused by early starting of the fan can be effectively avoided, the condition of fault shutdown caused by the defrosting mode is effectively reduced, the running reliability and stability of the air conditioner are improved, the switching stability of the four-way valve is improved, and the shutdown risk is reduced.
Example two:
as shown in fig. 3, in one embodiment of the present invention, there is provided a defrost control method of an air conditioner, including the steps of:
S202, acquiring pressure information of the air conditioner;
In some embodiments, pressure information of the air conditioner is acquired in real time during the operation of the air conditioner, and the pressure difference is calculated in real time.
In other embodiments, when the condition for defrosting end is satisfied, the system sends out an exit signal corresponding to the defrosting mode, and acquires the pressure information of the air conditioner.
And S204, controlling a fan of the air conditioner according to the pressure information.
in S204, because the four-way valve can affect the pressure of the refrigerant pipeline of the air conditioner by reversing, whether the four-way valve of the air conditioner is reversed or not can be accurately judged by pressure information of each refrigerant pipeline in the air conditioner based on the pressure information of each refrigerant pipeline in the air conditioner, and the fan of the air conditioner is started after the four-way valve is reversed, so that the problem that the four-way valve fails to reverse due to the fact that the pressure difference is reduced because the fan is started in advance can be effectively avoided, the condition of fault shutdown caused by the defrosting mode is effectively reduced, and the reliability and the stability of the operation of the air conditioner are improved.
as shown in fig. 4, in an embodiment of the present invention, the step of acquiring the pressure information of the air conditioner specifically includes:
S302, acquiring the exhaust pressure and the suction pressure of a compressor of the air conditioner;
in S302, the discharge pressure and the suction pressure during the operation of the compressor are obtained in real time, and control is performed based on the discharge pressure and the suction pressure.
And S304, acquiring the pressure of the fins of the air conditioner.
in S304, the fin pressure of the air conditioner is acquired in real time. Wherein, when the air conditioner runs in the heating mode, the pressure of the fin is close to the suction pressure of the compressor, and when the air conditioner runs in the cooling/defrosting mode, the pressure of the fin is close to the discharge pressure of the compressor.
As shown in fig. 5, in an embodiment of the present invention, the step of controlling the fan of the air conditioner according to the pressure information specifically includes:
S402, calculating a first difference value between the exhaust pressure and the fin pressure, and calculating a second difference value between the suction pressure and the fin pressure;
S404, controlling the fan to start based on the first difference value being larger than the first difference value threshold and the second difference value being smaller than the second difference value threshold.
When the air conditioner operates in a cooling mode and/or a defrosting mode, the fin pressure of the air conditioner is specifically the pressure of a pipeline between an exhaust pipeline of the compressor and a heat exchanger fin of the air conditioner. When the air conditioner runs in a heating mode, the pressure of the fins of the air conditioner is specifically the pressure of a pipeline between an air suction pipeline of the compressor and heat exchange fins of the air conditioner.
specifically, the first difference and the second difference may be calculated by the following formulas:
ΔP1＝P1-P3；
ΔP2＝P3-P2。
Wherein P1 is exhaust pressure, P2 is suction pressure, P3 is fin pressure, Δ P1 is a first difference, and Δ P2 is a second difference.
After the first difference Δ P1 and the second difference Δ P2 are calculated, Δ P1 is compared with a preset magnitude of Δ Ps1, and Δ P2 is compared with a preset magnitude of Δ Ps 2. When the conditions that delta P1 is larger than delta Ps1 and delta P2 is smaller than delta Ps2 are met, the system can confirm that the four-way valve is completely reversed, and the problems of pressure difference reduction and four-way valve reversing failure cannot be caused by controlling the fan to start at the moment.
wherein, Δ Ps1 is a first difference threshold, and the value range of the first difference threshold is: 1.0bar to 50 bar. Δ Ps2 is a second difference threshold, and the value range of the second difference threshold is: 0bar to 1.0 bar.
In some embodiments, the first difference threshold Δ Ps1 may have a range of values: 1.0bar to 30 bar.
In some embodiments, the first difference threshold Δ Ps1 may have a range of values: 1.0bar to 5.0 bar.
in some embodiments, the first difference threshold Δ Ps1 may have a range of values: 1.0bar to 3.0 bar.
in some embodiments, specific values of Δ Ps1 and Δ Ps2 are specifically determined according to hardware parameters, installation specifications, refrigerant types, and the like of the air conditioner.
after confirming that the four-way valve is reversed, the fan of the air conditioner is started again, the condition of fault shutdown caused by a defrosting mode can be effectively reduced, the running reliability and stability of the air conditioner are further improved, meanwhile, the switching stability of the four-way valve is improved, and the shutdown risk of protection is reduced.
Example three:
As shown in fig. 6, before the step of acquiring pressure information of the air conditioner, the defrost control method further includes:
s502, controlling the four-way valve of the air conditioner to switch states to enter a defrosting mode and controlling a fan to be turned off based on a defrosting start signal;
In S502, the air conditioner may determine whether frosting occurs according to the weight of the outdoor heat exchanger, the temperature of the outdoor heat exchanger, the pressure value of the pipeline of the outdoor heat exchanger, or by setting an image acquisition device, an infrared sensor, or the like, and when frosting occurs, a defrosting start signal is generated, and the four-way valve is controlled to switch states based on the defrosting start signal, and at this time, the air conditioner enters a defrosting mode.
And S504, controlling the four-way valve to switch the state again to exit the defrosting mode based on the exit signal.
In S504, when the defrosting end condition is satisfied, the system generates an exit signal corresponding to the defrosting mode, and at this time, the four-way valve is controlled to switch the state again, and the air conditioner resumes the normal operation mode.
and the condition for finishing defrosting corresponds to the condition for judging whether the outdoor heat exchanger frosts. For example, if the air conditioner determines that the outdoor heat exchanger is frosted based on the weight of the outdoor heat exchanger exceeding a preset weight threshold, correspondingly, when determining whether the condition of defrosting completion is satisfied, it is sufficient to determine whether the weight of the outdoor heat exchanger is lower than another preset weight threshold, and when the weight of the outdoor heat exchanger is lower than another preset weight threshold, it can be determined that the condition of defrosting completion is satisfied.
Similarly, if the air conditioner judges whether frosting occurs or not based on the image acquired by the image acquisition device, when judging whether the condition of defrosting completion is met or not, the frosting is judged to be eliminated or not through the image acquired in real time, and when the frosting is eliminated, the condition of defrosting completion can be determined to be met.
Example four:
As shown in fig. 7, in a complete embodiment of the present invention, the control logic for a complete defrost cycle of the air conditioner is as follows:
S602, judging that the defrosting condition is met by the system, and generating a defrosting starting signal;
S604, controlling the four-way valve to be powered off and switching states based on the defrosting starting signal so as to switch the air conditioner from a heating state to a cooling state;
s606, turning off the fan;
S608, judging whether the defrosting end condition is met; if yes, the process goes to S610, otherwise, the process is repeated to execute S608;
S610, controlling the four-way valve to be electrified so as to switch the state again;
s612, judging whether the pressure information meets the condition so as to determine whether the four-way valve is switched completely; if yes, the process goes to S614, otherwise, S612 is executed repeatedly;
In S612, when Δ P1 > Δ Ps1 is satisfied, and at the same time, conditions of Δ P2 < Δ Ps2 are satisfied, the system determines that the four-way valve has been completely reversed, and at this time, controlling the fan to start does not cause the problems of pressure difference reduction and failure in reversing the four-way valve.
specifically, the first difference and the second difference are calculated by the following formulas:
ΔP1＝P1-P3；
ΔP2＝P3-P2。
wherein, P1 is the discharge pressure, P2 is the suction pressure, P3 is the fin pressure, Δ P1 is the first difference, Δ P2 is the second difference, Δ Ps1 is the first difference threshold, the value range of the first difference threshold is: 1.0bar to 50 bar. Δ Ps2 is a second difference threshold, and the value range of the second difference threshold is: 0bar to 1.0 bar.
In some embodiments, the first difference threshold Δ Ps1 may have a range of values: 1.0bar to 30 bar.
In some embodiments, the first difference threshold Δ Ps1 may have a range of values: 1.0bar to 5.0 bar.
In some embodiments, the first difference threshold Δ Ps1 may have a range of values: 1.0bar to 3.0 bar.
The air conditioner is internally provided with a plurality of pressure sensors, specifically, as shown in fig. 2, an air source heat pump system is provided with a refrigerant circulation path of the air source heat pump system, the main structure of the air source heat pump system comprises a compressor, a four-way valve, a shell tube and fins, and the shell tube is arranged in a water tank and is contacted with water. The fins are in contact with the air, and the fins are equivalent to an outdoor heat exchanger. The pressure sensor includes: and the air suction sensor is arranged at the air suction port of the compressor and is used for acquiring air suction pressure P2. And the exhaust sensor is arranged at the exhaust port of the compressor and is used for acquiring exhaust pressure P1. And a fin sensor arranged between the four-way valve and the fin, wherein the fin sensor is used for acquiring fin pressure P3.
When the air source heat pump system operates in a heating mode, the four-way valve is in a conduction state of 1-4 conduction and 2-3 conduction, and the fin pressure sensor is connected between the air suction port and the fins of the compressor, so that the fin pressure P3 at the moment is close to the suction pressure P2.
When the air source heat pump system operates in a cooling mode or a defrosting mode, the conduction state of the four-way valve is 1-2 conduction, 4-3 conduction, and at the moment, the fin pressure sensor is equivalently connected between the exhaust port and the fins of the compressor, so that the fin pressure P3 is close to the exhaust pressure P1.
And S614, starting the fan, and finishing defrosting.
after the four-way valve of the air conditioner is ensured to be reversed, the fan is started again, the problem that the reversing of the four-way valve fails due to the fact that the pressure difference is reduced because the fan is started in advance can be effectively solved, the condition that the air conditioner is stopped due to faults in a defrosting mode is effectively reduced, the reliability and the stability of the operation of the air conditioner are improved, meanwhile, the stability of the switching of the four-way valve is improved, and the risk of protection and shutdown is reduced.
example five:
In one embodiment of the present invention, there is provided an air conditioner including the defrost control system of the air conditioner as provided in any of the above embodiments, and therefore, the air conditioner includes all the advantageous effects of the defrost control system of the air conditioner as provided in any of the above embodiments.
Specifically, when the air conditioner exits the defrosting mode, whether the four-way valve of the air conditioner is reversed or not can be accurately judged by pressure information of each refrigerant pipeline in the air conditioner, and the fan of the air conditioner is started after the four-way valve is reversed, so that the problem that the reversing of the four-way valve fails due to the fact that the pressure difference is reduced because the fan is started in advance can be effectively avoided, the condition of fault shutdown caused by the defrosting mode is effectively reduced, and the running reliability and stability of the air conditioner are improved.
Example six:
in one embodiment of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the defrosting control method of an air conditioner as provided in any one of the above embodiments, and therefore, the computer-readable storage medium includes all the advantageous effects of the defrosting control method of an air conditioner as provided in any one of the above embodiments.
Specifically, when the air conditioner meets the condition of exiting the defrosting mode, the pressure information of each refrigerant pipeline in the air conditioner is obtained based on the exiting signal, whether the four-way valve of the air conditioner is completely reversed or not can be accurately judged based on the pressure information of each refrigerant pipeline in the air conditioner when exiting the defrosting mode, and the fan of the air conditioner is started after the four-way valve is completely reversed, so that the problem that the four-way valve is failed to be reversed due to the fact that the pressure difference is reduced because the fan is started in advance can be effectively avoided, the condition of fault shutdown caused by the defrosting mode is effectively reduced, and the reliability and the stability of the operation of the air conditioner are improved.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
in the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. a defrost control system for an air conditioner, comprising:
A memory configured to be adapted to store a computer program;
A processor configured to be adapted to execute the computer program to implement:
Acquiring pressure information of the air conditioner based on an exit signal corresponding to a defrost mode;
And controlling a fan of the air conditioner according to the pressure information.
2. The defrost control system of claim 1, wherein the processor executes the computer program to perform the step of obtaining pressure information of the air conditioner, in particular comprising:
Acquiring the exhaust pressure and the suction pressure of a compressor of the air conditioner, and acquiring the fin pressure of the air conditioner;
the processor executes the computer program to realize the step of controlling the fan of the air conditioner according to the pressure information, and specifically includes:
calculating a first difference between the discharge pressure and the fin pressure, and calculating a second difference between the suction pressure and the fin pressure;
and controlling the fan to start based on the first difference value being larger than a first difference value threshold value and the second difference value being smaller than a second difference value threshold value.
3. The defrost control system of an air conditioner of claim 2, wherein said fin pressure is specifically:
line pressure between the compressor and heat exchanger fins of the air conditioner.
4. The defrost control system of any one of claims 1-3, wherein the processor is further configured to execute the computer program to perform, prior to the step of obtaining pressure information for the air conditioner:
Controlling a four-way valve of the air conditioner to switch states to enter the defrosting mode and controlling the fan to be turned off based on a defrosting starting signal; and
and controlling the four-way valve to switch the state again to exit the defrosting mode based on the exit signal.
5. The defrosting control system of an air conditioner according to claim 2 or 3, wherein the first difference threshold has a value range of: 1.0bar to 50 bar;
The value range of the second difference threshold is as follows: 0bar to 1.0 bar.
6. A defrosting control method of an air conditioner is characterized by comprising the following steps:
acquiring pressure information of the air conditioner based on an exit signal corresponding to a defrost mode;
and controlling a fan of the air conditioner according to the pressure information.
7. The defrosting control method of an air conditioner according to claim 6, wherein the step of obtaining the pressure information of the air conditioner specifically includes:
acquiring the exhaust pressure and the suction pressure of a compressor of the air conditioner, and acquiring the fin pressure of the air conditioner;
The step of controlling the fan of the air conditioner according to the pressure information specifically includes:
Calculating a first difference between the discharge pressure and the fin pressure, and calculating a second difference between the suction pressure and the fin pressure;
And controlling the fan to start based on the first difference value being larger than a first difference value threshold value and the second difference value being smaller than a second difference value threshold value.
8. The defrosting control method of an air conditioner according to claim 7, wherein the fin pressure is specifically:
A line pressure between the compressor to an outdoor heat exchanger of the air conditioner.
9. The defrosting control method of an air conditioner according to any one of claims 6 to 8, wherein before the step of acquiring the pressure information of the air conditioner, the defrosting control method further comprises:
Controlling a four-way valve of the air conditioner to switch states to enter the defrosting mode and controlling the fan to be turned off based on a defrosting starting signal; and
And controlling the four-way valve to switch the state again to exit the defrosting mode based on the exit signal.
10. The defrosting control method of an air conditioner according to claim 7 or 8, wherein the first difference threshold has a value range of: 1.0bar to 50 bar;
the value range of the second difference threshold is as follows: 0bar to 1.0 bar.
11. an air conditioner, comprising:
The defrost control system of the air conditioner as claimed in any one of claims 1 to 5.
12. A computer-readable storage medium on which a computer program is stored, the computer program being characterized by implementing a defrost control method of an air conditioner according to any one of claims 6 to 10 when executed by a processor.
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