CN107894058B - Air conditioner state control method and device - Google Patents
Air conditioner state control method and device Download PDFInfo
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- CN107894058B CN107894058B CN201711069998.0A CN201711069998A CN107894058B CN 107894058 B CN107894058 B CN 107894058B CN 201711069998 A CN201711069998 A CN 201711069998A CN 107894058 B CN107894058 B CN 107894058B
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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Abstract
The invention provides an air conditioner state control method and device, and relates to the technical field of air conditioners. The method comprises the steps of firstly controlling the electronic expansion valve to close after a shutdown instruction is received, controlling the evaporator, the compressor and the condenser to continue working after the valve is closed, and finally controlling the compressor and the condenser to stop working according to the amount of refrigerant transferred into a pipeline between the compressor and the electronic expansion valve from the pipeline between the compressor and the evaporator. The air conditioner state control method and the air conditioner state control device have the advantages that when the compressor is started, the problem that the compressor cannot be started due to the fact that too much liquid refrigerant is absorbed is solved, and accordingly the reliability of the compressor is higher.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner state control method and device.
Background
In recent years, the variable-frequency multi-split air conditioner has the advantages of more accurate indoor temperature control, comfort and energy conservation, only one mounting position of an external unit and the like due to the fact that the refrigerant quantity is controlled by the high-precision electronic expansion valve, and is popular among people.
However, the frequency conversion system with one drive for multiple systems needs more refrigerants due to more internal machines and longer pipelines. When all the indoor units are turned off, the refrigerant is accumulated.
Wherein, a part of refrigerant is piled up in the pipeline between compressor and electronic expansion valve, and another part of refrigerant is piled up in the pipeline between compressor and evaporimeter. Because the refrigerant accumulated in the pipeline between the compressor and the evaporator has two forms of gas state and liquid state, when a user starts the compressor, the liquid refrigerant can enter the compressor to compress the liquid of the compressor, thereby influencing the reliability of the compressor; it may even occur that the compressor fails to start up due to absorption of an excessive amount of liquid refrigerant.
In view of the above, how to solve the above problems is the focus of attention of those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to an air conditioner state control method to solve the problem in the prior art that a compressor fails to start due to absorption of excessive liquid refrigerant when the compressor is turned on.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the air conditioner state control method is applied to an air conditioner, the air conditioner comprises an evaporator, a compressor, a condenser and an electronic expansion valve, the evaporator, the compressor, the condenser and the electronic expansion valve are sequentially connected end to end and are communicated, and the air conditioner state control method comprises the following steps:
controlling the electronic expansion valve to close according to a shutdown instruction;
after the electronic expansion valve is closed, controlling the evaporator to maintain the working state for a first preset time, and controlling the condenser and the compressor to maintain the working state, so that the refrigerant in the pipeline between the compressor and the evaporator is transferred into the pipeline between the compressor and the electronic expansion valve;
and controlling the compressor and the condenser to stop working according to the pressure in the pipeline between the compressor and the evaporator or the pressure in the pipeline between the compressor and the electronic expansion valve.
Compared with the prior art, the air conditioner state control method has the following advantages:
the invention provides an air conditioner state control method, which is used for controlling an electronic expansion valve to close after receiving a shutdown instruction, and controlling an evaporator, a compressor and a condenser to continue working after closing the valve. Because the electronic expansion valve is closed at the moment, when the evaporator, the compressor and the condenser continue to work, the compressor can continue to compress the refrigerant in the pipeline between the compressor and the evaporator and discharge the compressed refrigerant into the pipeline between the compressor and the electronic expansion valve, so that the refrigerant in the pipeline between the compressor and the evaporator is reduced, and the problem that the compressor cannot be started due to the fact that too much liquid refrigerant is absorbed can be avoided when the compressor is started again.
Another object of the present invention is to provide an air conditioner state control device, which is applied to an air conditioner, the air conditioner includes an evaporator, a compressor, a condenser and an electronic expansion valve, the evaporator, the compressor, the condenser and the electronic expansion valve are sequentially connected end to end and are conducted, the air conditioner state control device includes:
the valve closing unit is used for controlling the electronic expansion valve to close according to a shutdown instruction;
the operation state control unit is used for controlling the evaporator to maintain the working state for a first preset time after the electronic expansion valve is closed, and controlling the condenser and the compressor to maintain the working state so as to transfer a refrigerant in a pipeline between the compressor and the evaporator into a pipeline between the compressor and the electronic expansion valve;
the operation state control unit is also used for controlling the compressor and the condenser to stop working according to the pressure in the pipeline between the compressor and the evaporator or the pressure in the pipeline between the compressor and the electronic expansion valve.
The air conditioner state control device and the air conditioner state control method have the same advantages compared with the prior art, and are not repeated herein
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
Fig. 2 is a flowchart of an air conditioner state control method according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating a first sub-step of step S3 in fig. 2 according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating a second sub-step of step S3 in fig. 2 according to an embodiment of the invention.
Fig. 5 is a block diagram of an air conditioner state control device according to an embodiment of the present invention.
Fig. 6 is a sub-module diagram of an operation status control unit according to an embodiment of the present invention.
Description of reference numerals:
the air conditioner comprises an air conditioner state control device, a 2-valve closing unit, a 3-running state control unit, a 31-pressure value receiving module, a 32-judgment module, a 33-running state control module, a 4-time calculation unit, a 5-judgment unit, a 6-controller, a 7-compressor, an 8-electronic expansion valve, a 9-evaporator, a 10-condenser, a 11-first pressure sensor and a 12-second pressure sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, an embodiment of the present invention provides an air conditioner state control method, which is applied to an air conditioner, where the air conditioner includes a controller, an evaporator, a compressor, a condenser, and an electronic expansion valve, the evaporator, the compressor, the condenser, and the electronic expansion valve are sequentially connected end to end and are connected, and the controller is electrically connected to the evaporator, the compressor, the condenser, and the electronic expansion valve, respectively. The evaporator is used for changing liquid refrigerants into gaseous refrigerants so as to absorb surrounding heat, the compressor is used for compressing the gaseous refrigerants so as to change the refrigerants into high-temperature high-pressure gaseous refrigerants, the condenser is used for changing the refrigerants into low-temperature high-pressure liquid refrigerants, and the electronic expansion valve is used for changing the refrigerants into low-temperature low-pressure liquid refrigerants. The inside of the air conditioner forms an annular channel through the evaporator, the compressor, the condenser and the electronic expansion valve, the refrigerant continuously moves in the channel, and the state is continuously changed, so that the air conditioner has a corresponding refrigeration or heating mode.
At present, when a user needs to close an air conditioner, an evaporator, a compressor, a condenser and an electronic expansion valve are all closed at the same time, so that when the air conditioner stops working, a refrigerant is uniformly distributed in a pipeline of the air conditioner, although the refrigerant of the pipeline between the evaporator and the compressor is originally gaseous, the state of the refrigerant can be changed at a long-time normal temperature, namely the gaseous refrigerant is changed into a liquid refrigerant. Meanwhile, a pipeline between the evaporator and the compressor comprises a gas-liquid separator, and a refrigerant between the evaporator and the compressor is generally accumulated in the gas-liquid separator. When the compressor is started again, the liquid refrigerant in the gas-liquid separator needs to be completely absorbed, and the refrigerant with a certain superheat degree can be absorbed, so that the liquid compression of the compressor is caused, and the reliability of the compressor is affected.
In view of this, the air conditioning state control method according to this embodiment can transfer the refrigerant from the pipeline between the compressor and the evaporator to the pipeline between the compressor and the electronic expansion valve after the air conditioner stops operating.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for controlling a refrigerant staying position according to an embodiment of the present invention, and details of the specific flow illustrated in fig. 2 are described below.
And step S1, controlling the electronic expansion valve to close according to a shutdown command.
In this embodiment, after receiving the shutdown instruction, the controller controls the electronic expansion valve to close at a preset speed, and in order to achieve the purpose of closing the valve as quickly as possible, the controller closes the valve at the fastest valve closing speed, in this embodiment, closes the valve at a speed of 32 pls/s. Of course, in some other embodiments, due to the difference in the performance of the electronic expansion valve, the valve may be closed at another speed, which is not limited in this embodiment.
Meanwhile, the shutdown instruction referred to in this embodiment may be sent by a controller through a remote controller, or may be automatically generated in the case of power failure, which is not limited in this embodiment.
And step S2, controlling the evaporator to maintain the working state for a first preset time after the electronic expansion valve is closed, and controlling the condenser and the compressor to maintain the working state.
When the electronic expansion valve is completely closed, the controller still controls the evaporator, the compressor and the condenser to continue to work. Since a certain time is required for closing the electronic expansion valve, in the process, the liquid refrigerant in the high-pressure side pipeline (i.e., the pipeline between the condenser and the compressor) continuously flows into the pipeline between the evaporator and the electronic expansion valve through the electronic expansion valve, and then flows into the low-pressure side pipeline after passing through the evaporator. In order to completely transfer the refrigerant in the low-pressure side pipeline, the evaporator needs to be controlled to continue to operate for a first preset time, so that the liquid refrigerant between the evaporator and the electronic expansion valve is converted into a gaseous refrigerant.
It should be noted that, in this embodiment, the starting time of the first preset time for the evaporator to continue to operate may be counted from the time when the controller receives the shutdown instruction, or may be counted from the time when the electronic expansion valve is closed. Meanwhile, through a plurality of researches of the inventor, the first preset time is set to 45S after the controller receives the shutdown instruction, so that all the refrigerant between the evaporator and the electronic expansion valve can flow into the pipeline between the compressor and the evaporator. Since it takes only a few seconds to close the electronic expansion valve, the evaporator will continue to operate for a longer period of time after the electronic expansion valve closes.
After the evaporator converts the liquid refrigerant into the gaseous refrigerant, the refrigerant is transferred to a pipeline between the compressor and the evaporator. At this moment, the compressor and the condenser can continue to work, the compressor converts the gaseous refrigerant in the pipeline between the compressor and the evaporator into the gaseous refrigerant with high temperature and high pressure, the condenser converts the gaseous refrigerant with high temperature and high pressure into the liquid refrigerant with low temperature and high pressure, and meanwhile, because the electronic expansion valve is closed, the liquid refrigerant can be accumulated in the pipeline between the condenser and the electronic expansion valve, so that the refrigerant in the pipeline at the low pressure side is transferred into the pipeline at the high pressure side, and the purpose of controlling the stop position of the refrigerant is achieved.
Meanwhile, it should be noted that, since the electronic expansion valve is closed, that is, the refrigerant in the air conditioner cannot form a circulating flow, if the compressor is still controlled to operate at a high frequency, the pressure in the pipeline between the compressor and the electronic expansion valve may suddenly rise, which may easily cause the pipeline to burst. In view of this, in this embodiment, the controller controls the compressor to operate at the preset low-frequency limit frequency, that is, at the lowest operating frequency of the controller, so that the pressure in the pipeline between the compressor and the electronic expansion valve does not suddenly rise, and the occurrence of the pipeline burst is prevented, where 25% of the rated frequency of the compressor in this embodiment is the low-frequency limit frequency.
It should be noted that, since the liquid phase is relatively lower in pressure than the gaseous phase in the same space. Therefore, in this embodiment, the condenser should convert the gaseous refrigerant into the liquid refrigerant as soon as possible for storage, so in this embodiment, the condenser operates at a rated power, that is, at the highest rotation speed.
And step S3, controlling the compressor and the condenser to stop working according to the pressure in the pipeline between the compressor and the evaporator or the pressure in the pipeline between the compressor and the electronic expansion valve.
After most or all of the refrigerant in the pipeline between the compressor and the evaporator is transferred into the pipeline between the compressor and the electronic expansion valve, the whole machine needs to be controlled to stop running, namely the compressor and the condenser are controlled to stop running, so that the transfer of the refrigerant is completed.
Specifically, referring to fig. 3, as a first implementation manner of the present embodiment, step S3 includes:
substep S31, receiving a first pressure value in the conduit between the compressor and the evaporator transmitted by a first pressure sensor.
The method comprises the steps that the refrigerant in the pipeline between the compressor and the evaporator is gradually transferred into the pipeline between the compressor and the electronic expansion valve, the refrigerant in the pipeline between the compressor and the evaporator is gradually reduced, so that the pressure in the pipeline between the compressor and the evaporator is gradually reduced, and a first pressure value in the pipeline between the compressor and the evaporator can be measured by using a first pressure sensor in the pipeline between the compressor and the evaporator.
And a substep S32 of determining whether the first pressure value is less than or equal to a preset low pressure value, and if so, executing a step S33.
In this embodiment, after most or all of the refrigerant in the pipeline between the compressor and the evaporator is transferred into the pipeline between the compressor and the electronic expansion valve, the first pressure value in the pipeline between the compressor and the evaporator at this time is the low pressure value, and meanwhile, since the low pressure value is relatively low, it is necessary to consider whether the pipeline can bear the low pressure value, so that the pipeline is not prone to burst. Through a plurality of experiments of the inventor, when the low-pressure value is 1MPa, the low-pressure value of the embodiment is 1MPa, which satisfies that the refrigerant in the pipeline between the compressor and the evaporator is basically transferred to the pipeline between the compressor and the electronic expansion valve, and the pipeline between the compressor and the evaporator can bear the low-pressure,
and a substep S33 of controlling the compressor and the condenser to stop working.
When the first pressure value is less than or equal to the preset low-pressure value, the compressor and the condenser can be controlled to stop working, and the situation that the pipeline is cracked when the compressor and the condenser continue to work is prevented.
Referring to fig. 4, as a second implementation manner of the present embodiment, step S3 includes:
and a substep S41 of receiving a second pressure value in the pipe between the compressor and the electronic expansion valve transmitted by a second pressure sensor.
Along with the gradual transfer of the refrigerant in the pipeline between the compressor and the evaporator to the pipeline between the compressor and the electronic expansion valve, the refrigerant in the pipeline between the compressor and the evaporator can be gradually reduced, and the refrigerant in the pipeline between the electronic expansion valve and the compressor can be gradually increased, so that the pressure in the pipeline between the electronic expansion valve and the compressor can be gradually increased, and a second pressure value in the pipeline between the electronic expansion valve and the compressor can be measured by using a second pressure sensor in the pipeline between the electronic expansion valve and the compressor.
And a substep S42 of judging that the second pressure value is greater than or equal to the preset high pressure value, and if so, executing a step S43.
In this embodiment, after most or all of the refrigerant in the pipeline between the compressor and the evaporator is transferred into the pipeline between the compressor and the electronic expansion valve, the pressure value in the pipeline between the electronic expansion valve and the compressor is the high pressure value at this time, and meanwhile, because the high pressure value is higher, it is necessary to consider whether the pipeline can bear the high pressure value, so that the pipeline is not easy to crack. Through a plurality of experiments of the inventor, when the high pressure value is 3.5MPa, the refrigerant in the pipeline between the compressor and the evaporator is basically transferred into the pipeline between the compressor and the electronic expansion valve, and the pipeline between the electronic expansion valve and the compressor can bear the high pressure, so the high pressure value of the embodiment is 3.5MPa,
and a substep S43 of controlling the compressor and the condenser to stop working.
When the second pressure value is greater than or equal to the preset high-pressure value, the compressor and the condenser can be controlled to stop working, and the phenomenon that the pipeline is cracked when the compressor and the condenser continue to work is avoided.
It should be noted that, the sub-step S31-the sub-step S33 and the sub-step S41-the sub-step S43 are in parallel, and there is no precedence. Namely, when the controller judges that the first pressure value is smaller than or equal to the preset low-pressure value and the second pressure value is larger than or equal to the preset high-pressure value, the compressor and the condenser are controlled to stop working.
And step S4, calculating the working time of the compressor and the condenser after the electronic expansion valve is closed.
Since the electronic expansion valve is closed when the compressor and the condenser continue to operate, if the compressor is controlled to operate for a long time, even if the operating frequency of the compressor is low, the resistance of the compressor or the condenser during operation is gradually increased due to the overlong operating time, and thus the compressor or the condenser may be damaged due to the long-time operation. In view of this, the working time of the compressor and the condenser after the electronic expansion valve is closed needs to be calculated in this embodiment.
And step S5, judging whether the working time is greater than a second preset time, if so, executing step S6, and if not, returning to step S2.
And step S6, controlling the compressor and the condenser to stop working.
When the working time of the compressor and the condenser after the electronic expansion valve is closed is longer than the second preset time, the compressor and the condenser are operated for a long time under the condition that the electronic expansion valve is closed, and if the compressor and the condenser continue to work in the abnormal working environment, the compressor or the condenser can be damaged. Therefore, when the working time of the compressor and the condenser after the electronic expansion valve is closed is longer than the second preset time, the controller controls the compressor and the condenser to stop working.
It should be noted that steps S4-S6 and S3 are also in parallel, and there is no precedence relationship. That is, when the controller determines that one of the first pressure value is less than or equal to the preset low-pressure value, the second pressure value is greater than or equal to the preset high-pressure value, and the working time is greater than or equal to the second preset time, the compressor and the condenser are controlled to stop working.
Second embodiment
Fig. 5 is a schematic diagram of functional units of an air conditioning state control device 1 according to a preferred embodiment of the present invention. It should be noted that the basic principle and the technical effects of the air conditioning state control device 1 provided in the present embodiment are the same as those of the above embodiments, and for the sake of brief description, no part of the embodiments of the present invention is mentioned, and reference may be made to the corresponding contents in the above embodiments. The air-conditioning state control device 1 includes a valve closing unit 2, an operation state control unit 3, a time calculation unit 4, and a judgment unit 5.
A valve closing unit 2; and the electronic expansion valve is controlled to close according to a shutdown instruction.
It will be appreciated that step S1 may be performed by closing the valve unit 2.
And the running state control unit 3 is used for controlling the evaporator to maintain the working state for a first preset time after the electronic expansion valve closes, and controlling the condenser and the compressor to maintain the working state.
It is understood that step S2 may be performed by the operating state control unit 3.
The operation state control unit 3 is further configured to control the compressor and the condenser to stop operating according to the pressure in the pipeline between the compressor and the evaporator or the pressure in the pipeline between the compressor and the electronic expansion valve.
It is understood that step S3 may be performed by the operating state control unit 3.
Specifically, referring to fig. 6, the operation state control unit 3 includes:
the pressure value receiving module 31 is configured to receive a first pressure value in a pipeline between the compressor and the evaporator, where the first pressure value is transmitted by a first pressure sensor.
It is understood that the sub-step S31 may be performed by the pressure value receiving module 31.
And the judging module 32 is used for judging that the first pressure value is less than or equal to a preset low-pressure value.
It is understood that the sub-step S32 may be performed by the decision module 32.
And the running state control module 33 is used for controlling the compressor and the condenser to stop working.
It will be appreciated that sub-step S33 may be performed by the run state control module 33.
The pressure value receiving module 31 is further configured to receive a second pressure value in the pipeline between the compressor and the electronic expansion valve, where the second pressure value is transmitted by a second pressure sensor.
It is understood that the sub-step S41 may be performed by the pressure value receiving module 31.
The determining module 32 is further configured to determine that the second pressure value is greater than or equal to a preset high pressure value.
It is understood that the sub-step S42 may be performed by the decision module 32.
The operation state control module 33 is further configured to control the compressor and the condenser to stop operating.
It will be appreciated that sub-step S42 may be performed by the shutdown control module 33.
And the time calculation unit 4 is used for calculating the working time of the compressor and the condenser after the electronic expansion valve closes.
It will be appreciated that sub-step S4 may be performed by the time calculation unit 4.
The judging unit 5 is further configured to judge whether the working time is greater than a second preset time.
It is understood that the sub-step S5 may be performed by the judgment unit 5.
The operation state control unit 3 is further configured to control the compressor and the condenser to stop operating if the operating time is greater than or equal to a second preset time.
It will be appreciated that sub-step S6 may be performed by the operating state control unit 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides an air conditioner state control method, is applied to the air conditioner, the air conditioner includes evaporimeter, compressor, condenser and electronic expansion valve, the evaporimeter the compressor the condenser and electronic expansion valve end to end connection just switches on in proper order, its characterized in that, air conditioner state control method includes:
controlling the electronic expansion valve to close according to a shutdown instruction;
after the electronic expansion valve is closed, controlling the evaporator to maintain a working state for a first preset time so as to convert liquid refrigerant of a pipeline between the electronic expansion valve and the evaporator into gaseous refrigerant through the evaporator;
meanwhile, the compressor is controlled to maintain a working state, and the compressor is controlled to work at a preset low-frequency limit frequency, so that the gaseous refrigerant is converted into a high-temperature and high-pressure gaseous refrigerant through the compressor;
the condenser is controlled to work at rated power, so that a high-temperature high-pressure gaseous refrigerant between the compressor and the condenser is converted into a low-temperature high-pressure liquid refrigerant through the condenser, and the low-temperature high-pressure liquid refrigerant is accumulated in a pipeline between the condenser and the electronic expansion valve;
and controlling the compressor and the condenser to stop working according to the pressure in the pipeline between the compressor and the evaporator or the pressure in the pipeline between the compressor and the electronic expansion valve.
2. The air conditioning state control method according to claim 1, wherein the step of controlling the compressor and the condenser to stop operating according to the pressure in the pipe between the compressor and the evaporator or the pressure in the pipe between the compressor and the electronic expansion valve comprises:
receiving a first pressure value in a pipeline between the compressor and the evaporator transmitted by a first pressure sensor;
and if the first pressure value is less than or equal to a preset low-pressure value, controlling the compressor and the condenser to stop working.
3. The air conditioning state control method according to claim 1, wherein the step of controlling the compressor and the condenser to stop operating according to the pressure in the pipe between the compressor and the evaporator or the pressure in the pipe between the compressor and the electronic expansion valve comprises:
receiving a second pressure value in a pipeline between the compressor and the electronic expansion valve, which is transmitted by a second pressure sensor;
and if the second pressure value is greater than or equal to a preset high-pressure value, controlling the compressor and the condenser to stop working.
4. The air conditioning state control method according to claim 1, wherein after the steps of controlling the evaporator to maintain an operating state for a first preset time after the electronic expansion valve is closed, and controlling the condenser and the compressor to maintain the operating state, the air conditioning state control method further comprises:
calculating the working time of the compressor and the condenser after the electronic expansion valve closes;
and if the working time is greater than or equal to a second preset time, controlling the compressor and the condenser to stop working.
5. The utility model provides an air conditioner state control device (1), is applied to the air conditioner, the air conditioner includes evaporimeter (9), compressor (7), condenser (10) and electronic expansion valve (8), evaporimeter (9) compressor (7) condenser (10) and electronic expansion valve (8) end to end connection in proper order and switch on, its characterized in that, air conditioner state control device includes:
the valve closing unit 2 is used for controlling the electronic expansion valve (8) to close according to a shutdown instruction;
the operation state control unit 3 is used for controlling the evaporator to maintain the working state for a first preset time after the electronic expansion valve is closed, so that liquid refrigerant of a pipeline between the electronic expansion valve and the evaporator is converted into gaseous refrigerant through the evaporator;
meanwhile, the compressor is controlled to maintain a working state, and the compressor is controlled to work at a preset low-frequency limit frequency, so that the gaseous refrigerant is converted into a high-temperature and high-pressure gaseous refrigerant through the compressor;
the condenser is controlled to work at rated power, so that a high-temperature high-pressure gaseous refrigerant between the compressor and the condenser is converted into a low-temperature high-pressure liquid refrigerant through the condenser, and the low-temperature high-pressure liquid refrigerant is accumulated in a pipeline between the condenser and the electronic expansion valve;
the operation state control unit 3 is also used for controlling the compressor (7) and the condenser (10) to stop working according to the pressure in the pipeline between the compressor (7) and the evaporator or the pressure in the pipeline between the compressor (7) and the electronic expansion valve.
6. The air-conditioning state control device (1) according to claim 5, characterized in that the operation state control unit 3 includes:
the pressure value receiving module (31) is used for receiving a first pressure value in a pipeline between the compressor (7) and the evaporator, which is transmitted by a first pressure sensor;
and the operation state control module (33) is used for controlling the compressor (7) and the condenser (10) to stop working if the first pressure value is less than or equal to a preset low-pressure value.
7. The air-conditioning state control device (1) according to claim 5, characterized in that the operation state control unit includes:
the pressure value receiving module is also used for receiving a second pressure value in a pipeline between the compressor (7) and the electronic expansion valve, which is transmitted by a second pressure sensor;
the operation state control module is also used for controlling the compressor (7) and the condenser (10) to stop working if the second pressure value is greater than or equal to a preset high-pressure value.
8. The air conditioning state control device according to claim 5, further comprising:
the time calculation unit is used for calculating the working time of the compressor (7) and the condenser (10) after the electronic expansion valve is closed;
the operation state control unit is also used for controlling the compressor (7) and the condenser (10) to stop working if the working time is more than or equal to a second preset time.
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| CN112393477A (en) * | 2020-11-27 | 2021-02-23 | 珠海格力电器股份有限公司 | Defrosting control method and refrigeration equipment adopting same |
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| JP5343618B2 (en) * | 2009-02-25 | 2013-11-13 | 株式会社デンソー | Refrigeration cycle equipment |
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| CN107894058A (en) | 2018-04-10 |
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