CN115013931A - Air conditioner, control method and device thereof, and computer readable storage medium - Google Patents

Air conditioner, control method and device thereof, and computer readable storage medium Download PDF

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Publication number
CN115013931A
CN115013931A CN202210529664.1A CN202210529664A CN115013931A CN 115013931 A CN115013931 A CN 115013931A CN 202210529664 A CN202210529664 A CN 202210529664A CN 115013931 A CN115013931 A CN 115013931A
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China
Prior art keywords
air conditioner
compressor
pressure
temperature
controlling
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Granted
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CN202210529664.1A
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Chinese (zh)
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CN115013931B (en
Inventor
朱天贵
邵艳坡
李健锋
刘帅帅
王军强
李秦
李东
朱声浩
周壮
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GD Midea Air Conditioning Equipment Co Ltd
Midea Group Wuhan HVAC Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Midea Group Wuhan HVAC Equipment Co Ltd
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Priority to CN202210529664.1A priority Critical patent/CN115013931B/en
Publication of CN115013931A publication Critical patent/CN115013931A/en
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Publication of CN115013931B publication Critical patent/CN115013931B/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an air conditioner, a control method and a control device thereof and a computer readable storage medium, wherein when the compressor is detected to be stopped, the temperature difference between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner is obtained; when the temperature difference value is greater than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference value is smaller than the preset threshold value, judging the pressure difference before the compressor is stopped and started through the high-pressure temperature and the low-pressure temperature measured in the refrigerant flow path, and when the temperature difference value is greater than or equal to the preset threshold value, namely the pressure difference of the compressor is larger, regulating the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan to reduce the pressure difference of the compressor, ensuring that the pressure difference before the compressor is started is within a safe range, and further improving the reliability of the compressor.

Description

Air conditioner, control method and device thereof, and computer readable storage medium
Technical Field
The present invention relates to the field of air conditioners, and in particular, to an air conditioner, a method and an apparatus for controlling the same, and a computer readable storage medium.
Background
The multi-split air conditioning system plays an increasingly important role in the field of central air conditioning of a household by virtue of the technical characteristics of accurate control, free use, convenience in installation, high efficiency, energy conservation and the like. The indoor units of the multi-split air-conditioning system are connected with the indoor units, and the multi-split air-conditioning system can cause the situation that a user operates the multi-split air-conditioning system by mistake, the compressor tries to start under some conditions for multiple times, and the like, so that the compressor is started and stopped frequently, and the compressor is started under the condition of pressure difference. And the compressor differential pressure start-up presents the following risks: the compressor oil is possibly discharged reversely from the compressor due to the failed starting of the compressor, so that the compressor is lack of oil, the compressor is damaged after long-time operation, and the service life is shortened. However, the existing method can not solve the problem of starting the compressor with differential pressure, and the reliability of the compressor is reduced.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide an air conditioner, a control method and a control device of the air conditioner and a computer readable storage medium of the air conditioner, and aims to solve the technical problems that in the prior art, a compressor is started with differential pressure, and the reliability of the compressor is reduced.
In order to achieve the above object, the present invention provides a method for controlling an air conditioner, in which a compressor, an outdoor heat exchanger, and indoor heat exchangers of the air conditioner are sequentially connected through a refrigerant flow path, the outdoor heat exchanger is respectively connected to a plurality of indoor heat exchangers, each of the indoor heat exchangers is connected to an electronic expansion valve and an indoor fan, the method comprising:
when the compressor is detected to be stopped, acquiring a temperature difference value between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner; and
and when the temperature difference is larger than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold value.
Optionally, the controlling the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan includes:
detecting whether a person exists in a room corresponding to the indoor heat exchanger; and
and controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan according to the detection result.
Optionally, the controlling the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan according to the detection result includes:
and when the detection result shows that people exist in the room, controlling the indoor fan to operate for a first preset time according to a preset rotating speed and then closing the indoor fan and/or controlling the electronic expansion valve to maintain for a second preset time according to a first preset opening degree and then closing the indoor fan.
Optionally, the controlling the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan according to the detection result includes:
and when the detection result shows that no person exists in the room, controlling the indoor fan to operate at a preset rotating speed for a first preset time and then to be closed and/or controlling the electronic expansion valve to operate at a second preset opening degree for a second preset time and then to be closed, wherein the first preset opening degree is smaller than the second preset opening degree.
Optionally, the air conditioner further includes an outdoor fan, a branch is arranged between a return air port and an exhaust port of a compressor of the air conditioner, an electromagnetic valve is arranged on the branch, the electromagnetic valve is used for controlling on-off of the exhaust port and the return air port, and the control method of the air conditioner further includes:
controlling the outdoor fan to operate for a third preset time period according to the rotating speed corresponding to the shutdown time of the compressor and then to be closed, and controlling the electromagnetic valve to be opened for the third preset time period and then to be closed; and
and after the outdoor fan and the electromagnetic valve are closed, returning to execute the step of acquiring the temperature difference between the high-pressure temperature and the low-pressure temperature of the refrigerant flow path in the air conditioner.
Optionally, a return air port of the compressor is provided with a low pressure sensor, an exhaust port of the compressor is provided with a high pressure sensor, and the control method of the air conditioner further includes:
detecting the temperature corresponding to the pressure of the air return port of the compressor through the low-pressure sensor to obtain the low-pressure temperature of a refrigerant flow path in the air conditioner; and
and detecting the temperature corresponding to the pressure of the exhaust port of the compressor through the high-pressure sensor to obtain the high-pressure temperature of a refrigerant flow path in the air conditioner.
Optionally, the control method of the air conditioner further includes:
and when the temperature difference value is smaller than a preset threshold value, closing the indoor fan and the electronic expansion valve.
In addition, in order to achieve the above object, the present invention further provides a control device of an air conditioner, wherein a compressor, an outdoor heat exchanger and indoor heat exchangers of the air conditioner are sequentially connected through a refrigerant flow path, the outdoor heat exchanger is respectively connected to a plurality of indoor heat exchangers, each indoor heat exchanger is connected to an electronic expansion valve and an indoor fan, the control device of the air conditioner includes:
when the compressor is detected to be stopped, acquiring a temperature difference value between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner;
and when the temperature difference is larger than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold value.
In addition, to achieve the above object, the present invention also provides an air conditioner including: the control method comprises the steps of storing a control program of the air conditioner, storing the control program of the air conditioner on a memory, and running on the processor, wherein the control program of the air conditioner is configured to realize the control method of the air conditioner.
Further, to achieve the above object, the present invention also proposes a computer readable storage medium having stored thereon a control program of an air conditioner, which when executed by a processor, implements the control method of the air conditioner as described above.
When the air conditioner, the control method and the control device of the air conditioner and the computer readable storage medium are detected that the compressor stops, the temperature difference value between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner is obtained; when the temperature difference value is greater than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference value is smaller than the preset threshold value, judging the pressure difference before the compressor is stopped and started through the high-pressure temperature and the low-pressure temperature measured in the refrigerant flow path, and when the temperature difference value is greater than or equal to the preset threshold value, namely the pressure difference of the compressor is larger, regulating the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan to reduce the pressure difference of the compressor, ensuring that the pressure difference before the compressor is started is within a safe range, and further improving the reliability of the compressor.
Drawings
FIG. 1 is a schematic diagram of an air conditioner in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a control method of an air conditioner according to a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a multi-split system according to an embodiment of a control method of an air conditioner of the present invention;
FIG. 4 is a flowchart illustrating a control method of an air conditioner according to a second embodiment of the present invention;
FIG. 5 is a flow chart illustrating a control method of an air conditioner according to a third embodiment of the present invention;
fig. 6 is a block diagram showing the structure of the control device of the air conditioner according to the first embodiment of the present invention.
Description of the reference numerals
1 Indoor fan 8 High-voltage sensor
2 Indoor heat exchanger 9 Low-voltage sensor
3 Electronic expansion valve 10 Compressor
4 Outdoor fan 11 Electromagnetic valve
5 Electronic expansion valve 12 Gas-liquid separator
6 Outdoor heat exchanger 13 Oil-liquid separator
7 Four-way valve
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: when the compressor is detected to be stopped, acquiring a temperature difference value between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner; and when the temperature difference value is greater than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference value is less than the preset threshold value.
In the related technology, after the compressor in the multi-split system is stopped and restarted, the condition of starting with pressure difference exists, the starting with pressure difference can cause the starting failure of the compressor and the oil of the compressor can be discharged reversely from the compressor, so that the oil of the compressor is deficient, the compressor can be damaged after long-time operation, the service life is shortened, and the reliability of the compressor is reduced.
The invention provides the solution, and aims to solve the technical problems of low reliability caused by differential pressure starting of the compressor.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioner in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the air conditioner may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the air conditioner, and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer-readable storage medium, may include therein an operating system, a network communication module, a user interface module, and a control program of an air conditioner.
In the air conditioner shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 of the air conditioner of the present invention may be provided in the air conditioner, and the air conditioner calls the control program of the air conditioner stored in the memory 1005 through the processor 1001 and executes the control method of the air conditioner provided by the embodiment of the present invention.
An embodiment of the present invention provides a method for controlling an air conditioner, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the method for controlling an air conditioner according to the present invention.
In this embodiment, the control method of the air conditioner includes the following steps:
step S10: and acquiring a temperature difference value between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner.
In this embodiment, the execution main body of this embodiment is a control device of the air conditioner, the control device of the air conditioner has functions of data processing, data communication, program operation, and the like, and the control device of the air conditioner may be a computer device such as a tablet, a computer, or a server. Of course, other devices with similar functions may be used, and the present embodiment is not limited thereto. For convenience of explanation, the present embodiment will be described taking a control device of an air conditioner as an example.
It should be noted that the multi-split air conditioning system plays an increasingly important role in the field of central air conditioning in the home by virtue of its technical features of accurate control, freedom of use, convenience of installation, high efficiency, energy saving, etc. The indoor units of the multi-split air-conditioning system are connected with the indoor units, and the multi-split air-conditioning system can cause the situation that a user operates the multi-split air-conditioning system by mistake, the compressor tries to start under some conditions for multiple times, and the like, so that the compressor is started and stopped frequently, and the compressor is started under the condition of pressure difference. And the compressor belt pressure differential starts present the following risks: the compressor oil is possibly discharged reversely from the compressor due to the failed starting of the compressor, so that the compressor is lack of oil, the compressor is damaged after long-time operation, and the service life is shortened.
In order to solve the above technical problem, in this embodiment, after the compressor is stopped, the differential pressure of the compressor is monitored in real time, and the differential pressure before the compressor is restarted is reduced by adjusting the opening of the electronic expansion valve of the indoor unit or the wind speed of the indoor unit, so that the reliability of the compressor is improved.
In a specific implementation, in this embodiment, after the compressor is detected to be stopped, a temperature difference between a high-pressure temperature and a low-pressure temperature of a refrigerant flow path in the air conditioner is obtained in real time, where the high-pressure temperature is a temperature of the refrigerant after being condensed in the outdoor heat exchanger.
Optionally, in this embodiment, the obtaining manner of the high pressure and the high temperature includes at least one of the following:
in one embodiment, a temperature sensor is disposed in the middle of the outdoor heat exchanger, the temperature sensor detects the temperature in the middle of the outdoor heat exchanger to obtain the high-pressure temperature, and when the temperature sensor detects the high-pressure temperature, the problem that the detected high-pressure temperature deviates from the actual high-pressure temperature is likely to occur, thereby causing the problem of inaccurate detection.
For example, in another embodiment, a high-pressure sensor is arranged in the outdoor heat exchanger, the high-pressure sensor detects the high-pressure of the outdoor heat exchanger to obtain the condensation temperature corresponding to the high-pressure, the high-pressure sensor directly detects the high-pressure as the high-pressure temperature, and the high-pressure temperature is obtained by determining the condensation temperature corresponding to the high-pressure, so that the obtained high-pressure temperature is more accurate.
In yet another embodiment, a high pressure sensor is disposed on the exhaust pipe of the compressor, the high pressure sensor detects the high pressure at the exhaust port of the compressor, and obtains the condensation temperature corresponding to the high pressure, as the high pressure, the high pressure sensor can be directly welded on the exhaust pipe, so that the operation is convenient, and the accuracy of determining the high pressure and the convenience of manufacturing the production process can be ensured.
Similar to the low pressure temperature obtaining manner, optionally, in another embodiment, a low pressure sensor is disposed on the air suction pipe of the compressor, the low pressure sensor detects the low pressure of the return air port of the compressor, and obtains the evaporation temperature corresponding to the low pressure, as the low temperature, the low pressure sensor can be directly welded on the air discharge pipe, so that the operation is convenient, and when the multi-split air conditioner is applied to the multi-split air conditioner, only the low pressure sensor needs to be mounted on the compressor, and the cost of the air conditioner is reduced.
In order to make the technical scheme related to the embodiment of each control method in the invention clearer, the invention further provides an air conditioner.
Referring to fig. 3, in the air conditioner of the present embodiment, a compressor 10, an outdoor heat exchanger 6 and an indoor heat exchanger 2 are sequentially connected through a refrigerant flow path, the outdoor heat exchanger 6 is respectively connected to a plurality of indoor heat exchangers 2, each indoor heat exchanger is connected to an electronic expansion valve 3 and an indoor fan 1, the compressor 10 is connected to the outdoor heat exchanger 6, a high pressure sensor 8 is disposed in the refrigerant flow path between the compressor 10 and the outdoor heat exchanger 6, an outdoor fan 4 and an electronic expansion valve 5 are further disposed in an outdoor unit, each indoor unit is composed of an indoor heat exchanger 2, an indoor fan 1 and an electronic expansion valve 3, the indoor heat exchanger 2 is connected to the compressor 10, a low pressure sensor 9 is disposed in the refrigerant flow path between the compressor 10 and the indoor heat exchanger 2, when cooling is performed, refrigerant flows through the outdoor heat exchanger 6 from the compressor 10 to be condensed, and then is evaporated by the indoor heat exchanger 2, and back to compressor 10.
Step S20: and when the temperature difference is larger than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold value.
In specific implementation, the high-pressure temperature and the low-pressure temperature are temperatures at which a refrigerant in the refrigerant flow path is condensed and evaporated, the temperatures correspond to pressures of the compressor, a temperature difference value is directly reflected in a pressure difference of the compressor, and the larger the temperature difference value is, the larger the pressure difference of the compressor is, so that when the temperature difference value is greater than or equal to a preset threshold value, the larger the pressure difference of the compressor can be determined, wherein the preset threshold value can be set according to actual conditions, which is not limited in this embodiment. In this case, in this embodiment, the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan are controlled, for example, the electronic expansion valve and/or the indoor unit are controlled to be closed in a delayed manner, so as to reduce the pressure difference of the compressor.
Further, if the temperature difference is smaller than the preset threshold, in this case, it may be determined that the pressure difference of the compressor is within the safety range, in this embodiment, the indoor fan and the electronic expansion valve may be directly turned off, and the operation of reducing the pressure difference is not required, and when a new set temperature is received or the indoor temperature changes, the compressor may be directly stopped and then started.
In the embodiment, when the compressor is detected to be stopped, the temperature difference between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner is acquired; when the temperature difference value is greater than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference value is smaller than the preset threshold value, judging the pressure difference before the compressor is stopped and started through the high-pressure temperature and the low-pressure temperature measured in the refrigerant flow path, and when the temperature difference value is greater than or equal to the preset threshold value, namely the pressure difference of the compressor is larger, regulating the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan to reduce the pressure difference of the compressor, ensuring that the pressure difference before the compressor is started is within a safe range, and further improving the reliability of the compressor.
Referring to fig. 4, fig. 4 is a flowchart illustrating a control method of an air conditioner according to a second embodiment of the present invention.
Based on the first embodiment, in the method for controlling an air conditioner according to this embodiment, the step S20 specifically includes:
step S201: and detecting whether a person exists in a room corresponding to the indoor heat exchanger.
It should be noted that in this embodiment, the differential pressure before starting is reduced by controlling the opening degree of the electronic expansion valve of the indoor unit and/or the rotation speed of the indoor fan, and the change of these parameters also affects the heating and cooling effects of the indoor unit, thereby affecting the comfort of the user. In this embodiment, before controlling the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan, it is necessary to first detect whether a person is in a room corresponding to the indoor heat exchanger, for example, in an embodiment, whether a person is in a room may be detected by an infrared sensor disposed in the indoor unit, and certainly, whether a person is in a room may be detected in other manners according to actual situations, which is not limited in this embodiment.
Step S202: and controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan according to the detection result.
In specific implementation, if a person is detected in a corresponding room, under such a condition, in order to ensure comfort of a user, in this embodiment, the indoor fan is controlled to operate at a preset rotation speed for a first preset time period and then to be closed and/or the electronic expansion valve is controlled to operate at the preset rotation speed for a second preset time period according to a first preset opening degree and then to be closed, where the preset rotation speed, the first preset time period, the first preset opening degree, and the second preset time period may all be correspondingly adjusted according to user requirements, for example, a setting range of the first preset opening degree is 72 to 150, which is not limited in this embodiment. For example, assume that the preset rotation speed is V and the first preset duration is T 1 The first preset opening is EEV 1 And the second preset duration is T 2 When detecting someone in the room, the rotational speed of the indoor fan is adjusted to V in this embodiment, and is delayed by T 1 Closing after second, and simultaneously adjusting the opening of the electronic expansion valve to EEV 1 And is turned off after a second preset duration.
Further, if a person is detected in the corresponding room, in this case, the pressure difference of the compressor is reduced in the most effective manner without considering the comfort of the user, in this embodiment, the indoor fan is controlled to operate at the preset rotation speed for a first preset time period and then to be turned off, and/or the electronic expansion valve is controlled to operate at the second preset opening degree for a second preset time period and then to be turned off, wherein the preset rotation speed is presetThe first preset time, the first preset opening degree and the second preset time can be correspondingly adjusted according to user requirements, the setting range of the second preset opening degree is 150-300, and this is not limited in this embodiment. For example, assume that the preset rotation speed is V and the first preset duration is T 1 The first preset opening degree is EEV 2 And the second preset duration is T 2 When detecting someone in the room, the rotational speed of the indoor fan is adjusted to V in this embodiment, and is delayed by T 1 Closing the valve after second, and simultaneously adjusting the opening of the electronic expansion valve to EEV 2 And is turned off after a second preset duration. It is emphasized that the difference compared to the case of a person in the room is that the opening degree of the electronic expansion valve is smaller when the person is in the room than when the room is not, i.e. the first preset opening degree is smaller than the second preset opening degree.
This embodiment is through there being the man-hour in the room at the testing result, control indoor fan closes and/or control after the first predetermined duration of operation according to the rotational speed of predetermineeing electronic expansion valve closes after keeping the second predetermined duration according to first predetermined aperture to and when the testing result is not man-hour in the room, control indoor fan closes and/or control after the first predetermined duration of operation according to the rotational speed of predetermineeing electronic expansion valve closes after keeping the second predetermined duration according to the second predetermined aperture, first predetermined aperture is less than the second predetermined aperture, through the mode of closing of control indoor fan and electronic expansion valve delay, has guaranteed the reliability of compressor, and the while is through the aperture setting of different electronic expansion valves, also can guarantee compressor shut down in-process user's travelling comfort.
Referring to fig. 5, fig. 5 is a flowchart illustrating a control method of an air conditioner according to a third embodiment of the present invention.
A third embodiment of a control method of an air conditioner of the present invention is proposed based on the first embodiment or the second embodiment described above.
Taking the first embodiment as an example, this embodiment further includes, in acquiring a temperature difference between a high-pressure temperature and a low-pressure temperature of a refrigerant flow path in the air conditioner, that:
step S00: and controlling the outdoor fan to operate for a third preset time according to the rotating speed corresponding to the shutdown time of the compressor and then to be closed, and controlling the electromagnetic valve to be opened for the third preset time and then to be closed.
It can be understood that a branch is arranged between a return air port and an exhaust port of a compressor of the air conditioner, an electromagnetic valve is arranged on the branch, the electromagnetic valve is used for controlling the on-off of the exhaust port and the return air port, when the electromagnetic valve is opened, part of the refrigerant directly leads to the return air port from the exhaust port, and the part of the refrigerant does not participate in a refrigeration cycle system; when the electromagnetic valve is closed, all the refrigerants are directly sent to the outdoor heat exchanger from the exhaust port. In order to obtain more accurate high-pressure temperature and low-pressure temperature, in this embodiment, after the compressor is stopped, the outdoor fan is controlled to operate at the rotation speed corresponding to the stop time of the compressor for a third preset time period and then to be closed, and the electromagnetic valve is controlled to be opened for the third preset time period and then to be closed, for example, the electromagnetic valve SV1 of the outdoor unit is opened for the duration time T 3 Then is closed, and meanwhile, the outdoor fan keeps running T 3 And stopping after the time, where the third preset time period may be set according to an actual requirement of the user, which is not limited in this embodiment. And after the electromagnetic valve and the outdoor fan are closed in a delayed mode, the high-pressure temperature and the low-pressure temperature in the refrigerant flow path are acquired.
In this embodiment, when the ambient temperature of the indoor room reaches the set temperature and the warm-up stop is reached, the operating frequency of the compressor starts to decrease, and when the frequency decreases to 0, it is determined that the warm-up stop of the compressor is reached.
In this embodiment, the outdoor fan is controlled to operate at a rotation speed corresponding to the shutdown time of the compressor for a third preset time period and then to be closed, the electromagnetic valve is controlled to be opened for the third preset time period and then to be closed, and the outdoor fan and the electromagnetic valve are controlled to be closed in a delayed manner, so that the high-pressure temperature and the low-pressure temperature are obtained more accurately, and the reliability of the compressor is further ensured.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium, on which a control program of an air conditioner is stored, which, when executed by a processor, implements the steps of the control method of the air conditioner as described above.
Referring to fig. 6, fig. 6 is a block diagram illustrating a control apparatus of an air conditioner according to a first embodiment of the present invention.
As shown in fig. 6, a control device of an air conditioner according to an embodiment of the present invention includes:
the detection module 10 is configured to obtain a temperature difference between a high-pressure temperature and a low-pressure temperature of a refrigerant flow path in the air conditioner when the compressor is detected to be stopped.
It should be noted that, by virtue of the technical features of accurate control, free use, convenient installation, high efficiency, energy saving and the like, the multi-split air conditioning system plays an increasingly important role in the field of central air conditioning in homes. The indoor units of the multi-split air-conditioning system are connected with the indoor units, and the multi-split air-conditioning system can cause the situation that a user operates the multi-split air-conditioning system by mistake, the compressor tries to start under some conditions for multiple times, and the like, so that the compressor is started and stopped frequently, and the compressor is started under the condition of pressure difference. And the compressor belt pressure differential starts present the following risks: the compressor oil is possibly discharged reversely from the compressor due to the failed starting of the compressor, so that the compressor is lack of oil, the compressor is damaged after long-time operation, and the service life is shortened.
In order to solve the above technical problem, in this embodiment, after the compressor is stopped, the differential pressure of the compressor is monitored in real time, and the differential pressure before the compressor is restarted is reduced by adjusting the opening of the electronic expansion valve of the indoor unit or the wind speed of the indoor unit, so that the reliability of the compressor is improved.
In a specific implementation, in this embodiment, after the compressor is detected to be stopped, a temperature difference between a high-pressure temperature and a low-pressure temperature of a refrigerant flow path in the air conditioner is obtained in real time, where the high-pressure temperature is a temperature of the refrigerant after being condensed in the outdoor heat exchanger.
Optionally, in this embodiment, the obtaining manner of the high pressure and the high temperature includes at least one of the following:
in one embodiment, a temperature sensor is disposed in the middle of the outdoor heat exchanger, the temperature sensor detects the temperature in the middle of the outdoor heat exchanger to obtain the high-pressure temperature, and when the temperature sensor detects the high-pressure temperature, the problem that the detected high-pressure temperature deviates from the actual high-pressure temperature is likely to occur, thereby causing the problem of inaccurate detection.
For example, in another embodiment, a high-pressure sensor is arranged in the outdoor heat exchanger, the high-pressure sensor detects the high-pressure of the outdoor heat exchanger to obtain the condensation temperature corresponding to the high-pressure, the high-pressure sensor directly detects the high-pressure as the high-pressure temperature, and the high-pressure temperature is obtained by determining the condensation temperature corresponding to the high-pressure, so that the obtained high-pressure temperature is more accurate.
In yet another embodiment, a high pressure sensor is disposed on the exhaust pipe of the compressor, the high pressure sensor detects the high pressure at the exhaust port of the compressor, and obtains the condensation temperature corresponding to the high pressure, as the high pressure, the high pressure sensor can be directly welded on the exhaust pipe, so that the operation is convenient, and the accuracy of determining the high pressure and the convenience of manufacturing the production process can be ensured.
Similar to the low pressure temperature obtaining manner, optionally, in another embodiment, a low pressure sensor is disposed on the air suction pipe of the compressor, the low pressure sensor detects the low pressure of the return air port of the compressor, and obtains the evaporation temperature corresponding to the low pressure, as the low temperature, the low pressure sensor can be directly welded on the air discharge pipe, so that the operation is convenient, and when the multi-split air conditioner is applied to the multi-split air conditioner, only the low pressure sensor needs to be mounted on the compressor, and the cost of the air conditioner is reduced.
In order to make the technical scheme related to the embodiment of each control method in the invention clearer, the invention further provides an air conditioner.
Referring to fig. 3, in the air conditioner of the present embodiment, a compressor 10, an outdoor heat exchanger 6 and an indoor heat exchanger 2 are sequentially connected through a refrigerant flow path, the outdoor heat exchanger 6 is respectively connected to a plurality of indoor heat exchangers 2, each indoor heat exchanger is connected to an electronic expansion valve 3 and an indoor fan 1, the compressor 10 is connected to the outdoor heat exchanger 6, a high pressure sensor 8 is disposed in the refrigerant flow path between the compressor 10 and the outdoor heat exchanger 6, an outdoor fan 4 and an electronic expansion valve 5 are further disposed in an outdoor unit, each indoor unit is composed of an indoor heat exchanger 2, an indoor fan 1 and an electronic expansion valve 3, the indoor heat exchanger 2 is connected to the compressor 10, a low pressure sensor 9 is disposed in the refrigerant flow path between the compressor 10 and the indoor heat exchanger 2, when cooling is performed, refrigerant flows through the outdoor heat exchanger 6 from the compressor 10 to be condensed, and then is evaporated by the indoor heat exchanger 2, and then back to compressor 10
And the control module 20 is configured to control the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan when the temperature difference is greater than or equal to a preset threshold value until the temperature difference is less than the preset threshold value.
In specific implementation, the high-pressure temperature and the low-pressure temperature are temperatures at which a refrigerant in the refrigerant flow path is condensed and evaporated, the temperatures correspond to pressures of the compressor, a temperature difference value is directly reflected in a pressure difference of the compressor, and the larger the temperature difference value is, the larger the pressure difference of the compressor is, so that when the temperature difference value is greater than or equal to a preset threshold value, the larger the pressure difference of the compressor can be determined, wherein the preset threshold value can be set according to actual conditions, which is not limited in this embodiment. In this case, in this embodiment, the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan are controlled, for example, the electronic expansion valve and/or the indoor unit are controlled to be closed in a delayed manner, so as to reduce the pressure difference of the compressor.
Further, if the temperature difference is smaller than the preset threshold, in this case, it may be determined that the pressure difference of the compressor is within the safety range, in this embodiment, the indoor fan and the electronic expansion valve may be directly turned off, and the operation of reducing the pressure difference is not required, and when a new set temperature is received or the indoor temperature changes, the compressor may be directly stopped and then started.
In the embodiment, when the compressor is detected to be stopped, the temperature difference between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner is acquired; when the temperature difference value is greater than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference value is smaller than the preset threshold value, judging the pressure difference before the compressor is stopped and started through the high-pressure temperature and the low-pressure temperature measured in the refrigerant flow path, and when the temperature difference value is greater than or equal to the preset threshold value, namely the pressure difference of the compressor is larger, regulating the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan to reduce the pressure difference of the compressor, ensuring that the pressure difference before the compressor is started is within a safe range, and further improving the reliability of the compressor.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment may be referred to a control method of an air conditioner provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a computer readable storage medium (e.g., Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A control method of an air conditioner is characterized in that a compressor, an outdoor heat exchanger and indoor heat exchangers of the air conditioner are sequentially connected through a refrigerant flow path, the outdoor heat exchanger is respectively connected with a plurality of indoor heat exchangers, each indoor heat exchanger is connected with an electronic expansion valve and an indoor fan, and the control method of the air conditioner comprises the following steps:
when the compressor is detected to be stopped, acquiring a temperature difference value between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner; and
and when the temperature difference is larger than or equal to a preset threshold value, controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold value.
2. The control method of an air conditioner according to claim 1, wherein said controlling the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan comprises:
detecting whether a person exists in a room corresponding to the indoor heat exchanger; and
and controlling the opening degree of the electronic expansion valve and/or the rotating speed of the indoor fan according to the detection result.
3. The control method of an air conditioner according to claim 2, wherein said controlling the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan according to the detection result comprises:
and when the detection result shows that people exist in the room, controlling the indoor fan to operate for a first preset time according to a preset rotating speed and then closing the indoor fan and/or controlling the electronic expansion valve to maintain for a second preset time according to a first preset opening degree and then closing the indoor fan.
4. The method for controlling an air conditioner according to claim 2, wherein said controlling the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan based on the detection result comprises:
and when the detection result shows that no person exists in the room, controlling the indoor fan to operate at a preset rotating speed for a first preset time and then to be closed and/or controlling the electronic expansion valve to operate at a second preset opening degree for a second preset time and then to be closed, wherein the first preset opening degree is smaller than the second preset opening degree.
5. The method for controlling an air conditioner according to any one of claims 1 to 4, wherein the air conditioner further comprises an outdoor fan, a branch is provided between a return air port and an exhaust air port of a compressor of the air conditioner, an electromagnetic valve is provided on the branch, the electromagnetic valve is used for controlling the on-off of the exhaust air port and the return air port, and the method for controlling the air conditioner further comprises:
controlling the outdoor fan to operate for a third preset time according to the rotating speed corresponding to the shutdown time of the compressor and then to be closed, and controlling the electromagnetic valve to be opened for the third preset time and then to be closed; and
and after the outdoor fan and the electromagnetic valve are closed, returning to execute the step of acquiring the temperature difference between the high-pressure temperature and the low-pressure temperature of the refrigerant flow path in the air conditioner.
6. The method for controlling an air conditioner according to any one of claims 1 to 4, wherein a return port of the compressor is provided with a low pressure sensor, and a discharge port of the compressor is provided with a high pressure sensor, the method further comprising:
detecting the temperature corresponding to the pressure of the air return port of the compressor through the low-pressure sensor to obtain the low-pressure temperature of a refrigerant flow path in the air conditioner; and
and detecting the temperature corresponding to the pressure of the exhaust port of the compressor through the high-pressure sensor to obtain the high-pressure temperature of a refrigerant flow path in the air conditioner.
7. The control method of an air conditioner as claimed in claims 1 to 4, wherein the control method of an air conditioner further comprises:
and when the temperature difference value is smaller than a preset threshold value, closing the indoor fan and the electronic expansion valve.
8. The utility model provides a controlling means of air conditioner, its characterized in that, the compressor, outdoor heat exchanger and the indoor heat exchanger of air conditioner connect gradually through the refrigerant flow path, outdoor heat exchanger is connected with a plurality of indoor heat exchangers respectively, and every indoor heat exchanger all is connected with electronic expansion valve and indoor fan, the controlling means of air conditioner includes:
the detection module is used for acquiring a temperature difference value between the high-pressure temperature and the low-pressure temperature of a refrigerant flow path in the air conditioner when the compressor is detected to be stopped;
and the control module is used for controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan when the temperature difference value is greater than or equal to a preset threshold value until the temperature difference value is less than the preset threshold value.
9. An air conditioner, characterized in that the air conditioner comprises: a memory, a processor, and a control program of an air conditioner stored on the memory and running on the processor, the control program of the air conditioner being configured to implement the control method of the air conditioner according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a control program of an air conditioner is stored thereon, which when executed by a processor implements the control method of the air conditioner according to any one of claims 1 to 7.
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