CN115013931B - 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
CN115013931B
CN115013931B CN202210529664.1A CN202210529664A CN115013931B CN 115013931 B CN115013931 B CN 115013931B CN 202210529664 A CN202210529664 A CN 202210529664A CN 115013931 B CN115013931 B CN 115013931B
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China
Prior art keywords
air conditioner
compressor
temperature
pressure
electronic expansion
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CN202210529664.1A
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CN115013931A (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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    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner, a control method, a control device and a computer readable storage medium thereof, wherein when the stop of a compressor is detected, the temperature difference between the high-pressure temperature and the low-pressure temperature of an cooling flow path in the air conditioner is obtained; when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold, judging the pressure difference of the compressor before stopping and starting through the high-pressure temperature and the low-pressure temperature measured in the refrigerant flow path, and when the temperature difference is greater than or equal to the preset threshold, namely the pressure difference of the compressor is greater, regulating the opening 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 of the compressor is within a safety range before starting, 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 more particularly, to an air conditioner, a control method and apparatus thereof, and a computer readable storage medium.
Background
The multi-split air conditioning system plays an increasingly important role in the field of home central air conditioning by virtue of the technical characteristics of accurate control, free use, convenient installation, high efficiency, energy conservation and the like. The multi-split system has the advantages that one indoor unit is connected with a plurality of indoor units, and the multi-split system can be subjected to misoperation of a user, multiple times of compressor start attempts under some conditions, and the like, so that the compressors are started and stopped frequently, and the situation that the compressors are started with pressure difference is caused. While compressor start-up with pressure differential is risky as follows: the compressor oil is likely to be reversely discharged from the compressor due to the failure of the start of the compressor, so that the compressor is short of oil, the compressor can be damaged after long-time operation, and the service life is shortened. However, the existing method cannot solve the problem of starting the compressor with pressure difference, and reduces the reliability of the compressor.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide an air conditioner, a control method and device thereof and a computer readable storage medium, and aims to solve the technical problems that in the prior art, a compressor is started with pressure difference, and the reliability of the compressor is reduced.
In order to achieve the above object, the present invention provides a control method of an air conditioner, in which a compressor, an outdoor heat exchanger and an indoor heat exchanger 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, the control method of the air conditioner includes:
when the compressor is detected to stop, acquiring a temperature difference value between a high-pressure temperature and a low-pressure temperature of a cooling flow path in the air conditioner; and
and when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold.
Optionally, the controlling the opening degree of the electronic expansion valve and/or the rotating 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 of the electronic expansion valve and/or the rotating speed of the indoor fan according to the detection result includes:
when the detection result is that people exist in the room, the indoor fan is controlled to operate for a first preset time period according to the preset rotating speed, and/or the electronic expansion valve is controlled to be closed after maintaining a second preset time period according to the first preset opening.
Optionally, the controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan according to the detection result includes:
when the detection result is that no person is in the room, the indoor fan is controlled to run for a first preset time period according to the preset rotating speed, and/or the electronic expansion valve is controlled to be closed after maintaining for a second preset time period according to a second preset opening, wherein the first preset opening is smaller than the second preset opening.
Optionally, the air conditioner further includes an outdoor fan, a branch is arranged between an air return port and an air exhaust port of the compressor of the air conditioner, an electromagnetic valve is arranged on the branch, the electromagnetic valve is used for controlling the air exhaust port to be opened or closed with the air return port, and the control method of the air conditioner further includes:
the outdoor fan is controlled to be closed after a third preset time period is operated according to the rotating speed corresponding to the stopping time of the compressor, and the electromagnetic valve is controlled to be closed after the third preset time period is opened; and
and after the outdoor fan and the electromagnetic valve are closed, returning to the step of acquiring the temperature difference between the high-pressure temperature and the low-pressure temperature of the cooling flow path in the air conditioner.
Optionally, the air return port of the compressor is provided with a low pressure sensor, the exhaust port of the compressor is provided with a high pressure sensor, and the control method of the air conditioner further comprises the following steps:
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 cooling flow path in the air conditioner; and
and detecting the temperature corresponding to the pressure of the exhaust port of the compressor by the high-pressure sensor to obtain the high-pressure temperature of the cooling flow path in the air conditioner.
Optionally, the control method of the air conditioner further includes:
and when the temperature difference is smaller than a preset threshold, closing the indoor fan and the electronic expansion valve.
In addition, in order to achieve the above object, the present invention provides a control device for an air conditioner, in which a compressor, an outdoor heat exchanger and an indoor heat exchanger 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, the control device for an air conditioner includes:
when the compressor is detected to stop, acquiring a temperature difference value between a high-pressure temperature and a low-pressure temperature of a cooling flow path in the air conditioner;
and when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold.
In addition, in order to achieve the above object, the present invention also provides an air conditioner, including: the control program of the air conditioner is configured to realize the control method of the air conditioner.
In addition, in order 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 an air conditioner as described above.
The invention provides an air conditioner, a control method and a control device thereof and a computer readable storage medium, wherein when the stop of a compressor is detected, the temperature difference between the high-pressure temperature and the low-pressure temperature of an cooling flow path in the air conditioner is obtained; when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold, judging the pressure difference of the compressor before stopping and starting through the high-pressure temperature and the low-pressure temperature measured in the refrigerant flow path, and when the temperature difference is greater than or equal to the preset threshold, namely the pressure difference of the compressor is greater, regulating the opening 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 of the compressor is within a safety range before starting, and further improving the reliability of the compressor.
Drawings
Fig. 1 is a schematic structural view of an air conditioner of a hardware operation environment according to an embodiment of the present invention;
FIG. 2 is a flowchart of a control method of an air conditioner according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a multi-split system according to an embodiment 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 flowchart illustrating a control method of an air conditioner according to a third embodiment of the present invention;
fig. 6 is a block diagram illustrating a control apparatus of an air conditioner according to a first embodiment of the present invention.
Description of the reference numerals
1 Indoor fan 8 High-voltage sensor
2 Indoor heat exchanger 9 Low pressure 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 achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The main solutions of the embodiments of the present invention are: when the compressor is detected to stop, acquiring a temperature difference value between a high-pressure temperature and a low-pressure temperature of a cooling flow path in the air conditioner; and when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold.
In the related art, after the compressors in the multi-split system are stopped and restarted, the situation of pressure difference starting exists, the pressure difference starting can lead to the failure of the starting of the compressors and the possibility of reverse discharge of the compressor oil from the compressors, so that the compressors are short of oil, the compressors can be damaged after long-time running, the service life is shortened, and the reliability of the compressors is reduced.
The invention provides the solution, and aims to solve the technical problems of low reliability when the compressor is started with pressure difference.
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 (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further 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 high-speed random access Memory (Random Access Memory, RAM) Memory or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the configuration shown in fig. 1 is not limiting of the air conditioner and may include more or fewer components than shown, or may combine certain components, or may be a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a control program of an air conditioner may be included in a memory 1005, which is one type of computer-readable storage medium.
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 in the air conditioner of the present invention may be disposed in the air conditioner, and the air conditioner invokes 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 control method for an air conditioner, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a control method for 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 the cooling flow path in the air conditioner.
In this embodiment, the execution body of the embodiment is a control device of the air conditioner, where the control device of the air conditioner has functions of data processing, data communication, program running, 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 implementation conditions are not limited thereto. For convenience of explanation, the present embodiment will be described with reference to a control device of an air conditioner.
It should be noted that, the multi-split air conditioning system plays an increasingly important role in the field of home central air conditioning by virtue of the technical characteristics of accurate control, free use, convenient installation, high efficiency, energy saving and the like. The multi-split system has the advantages that one indoor unit is connected with a plurality of indoor units, and the multi-split system can be subjected to misoperation of a user, multiple times of compressor start attempts under some conditions, and the like, so that the compressors are started and stopped frequently, and the situation that the compressors are started with pressure difference is caused. While compressor start-up with pressure differential is risky as follows: the compressor oil is likely to be reversely discharged from the compressor due to the failure of the start of the compressor, so that the compressor is short of oil, the compressor can be damaged after long-time operation, and the service life is shortened.
In order to solve the above technical problems, the embodiment monitors the pressure difference of the compressor in real time after the compressor is stopped, and reduces the pressure difference before restarting the compressor by adjusting the opening of the electronic expansion valve of the indoor unit or the wind speed of the indoor unit, thereby improving the reliability of the compressor.
In a specific implementation, in this embodiment, after the shutdown of the compressor is detected, a temperature difference between a high-pressure temperature and a low-pressure temperature of a cooling flow path in the air conditioner is obtained in real time, where the high-pressure temperature is a temperature of the refrigerant after condensation in the outdoor heat exchanger.
Optionally, the high-pressure temperature obtaining manner in this embodiment 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 of 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 easily occurs, so that the problem of inaccurate detection is caused.
In another embodiment, a high pressure sensor is arranged in the outdoor heat exchanger, the high pressure sensor is used for detecting the high pressure of the outdoor heat exchanger to obtain the condensation temperature corresponding to the high pressure, the high pressure sensor is used for directly detecting the high pressure to obtain the high pressure temperature, and the condensation temperature corresponding to the high pressure is determined to obtain the high pressure temperature, so that the obtained high pressure temperature is more accurate, but when the high pressure sensor is arranged in the outdoor heat exchanger, the production process is difficult to manufacture, and the difficulty in manufacturing the outdoor heat exchanger is high.
In still another embodiment, a high pressure sensor is disposed on the exhaust pipe of the compressor, the high pressure sensor detects the high pressure of the exhaust port of the compressor to obtain the condensation temperature corresponding to the high pressure, and the high pressure sensor can be directly welded on the exhaust pipe as the high pressure temperature, so that the operation is convenient, and the accuracy of the determination of the high pressure temperature and the convenience of the production process can be ensured.
In another embodiment, the air suction pipe of the compressor is provided with a low pressure sensor, the low pressure sensor is used for detecting the low pressure of the air return port of the compressor to obtain the evaporating temperature corresponding to the low pressure, and the low pressure sensor can be directly welded on the exhaust pipe as the low temperature.
In order to make the technical scheme related to the implementation mode of each control method clearer, the invention further provides an air conditioner.
Referring to fig. 3, in the air conditioner of the present embodiment, the compressor 10, the outdoor heat exchanger 6 and the indoor heat exchangers 2 are sequentially connected through refrigerant flow paths, and the outdoor heat exchanger 6 is respectively connected with a plurality of indoor heat exchangers 2, each indoor heat exchanger is connected with an electronic expansion valve 3 and an indoor fan 1, the compressor 10 is connected with the outdoor heat exchanger 6, the refrigerant flow path between the compressor 10 and the outdoor heat exchanger 6 is provided with a high pressure sensor 8, the outdoor unit part is also provided with an outdoor fan 4 and an electronic expansion valve 5, each indoor unit is composed of the indoor heat exchangers 2, the indoor fan 1 and the electronic expansion valve 3, the indoor heat exchangers 2 are linked with the compressor 10, the refrigerant flow path between the compressor 10 and the indoor heat exchangers 2 is provided with a low pressure sensor 9, and when refrigeration is performed, the refrigerant flows from the compressor 10 through the outdoor heat exchanger 6 to be condensed, then evaporated through the indoor heat exchangers 2 and then returns to the compressor 10.
Step S20: and when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold.
In a specific implementation, the high-pressure temperature and the low-pressure temperature are temperatures after the refrigerant in the refrigerant flow path is condensed and evaporated, the temperatures correspond to the pressure of the compressor, the temperature difference is directly reflected in the pressure difference of the compressor, and the pressure difference of the compressor is larger as the temperature difference is larger, so that when the temperature difference is larger than or equal to a preset threshold value, the pressure difference of the compressor can be determined to be larger at the moment, wherein the preset threshold value can be set according to the actual situation, and the embodiment is not limited. In this case, in this embodiment, the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan may be controlled, for example, the electronic expansion valve and/or the indoor unit may be controlled to be turned off 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 safe range, in this embodiment, the indoor fan and the electronic expansion valve may be directly closed, without performing the operation of reducing the pressure difference, and when a new set temperature is received or the indoor temperature changes, the compressor may be directly stopped and restarted.
In the embodiment, when the stop of the compressor is detected, the temperature difference between the high-pressure temperature and the low-pressure temperature of the cooling flow path in the air conditioner is obtained; when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold, judging the pressure difference of the compressor before stopping and starting through the high-pressure temperature and the low-pressure temperature measured in the refrigerant flow path, and when the temperature difference is greater than or equal to the preset threshold, namely the pressure difference of the compressor is greater, regulating the opening 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 of the compressor is within a safety range before starting, 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 above first embodiment, in the control method of the air conditioner of the present embodiment, the step S20 specifically includes:
step S201: detecting whether a person exists in a room corresponding to the indoor heat exchanger.
In this embodiment, the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan of the indoor unit are controlled to reduce the pressure difference before starting, 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 the opening of the electronic expansion valve and/or the rotational speed of the indoor fan are controlled, it is required to detect whether a person is in the room corresponding to the indoor heat exchanger, for example, in an embodiment, whether a person is in the room may be detected by an infrared sensor disposed in the indoor unit, or whether a person is in the room may be detected by 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 a specific implementation, if a person is detected in a corresponding room, in this case, in order to ensure user comfort, in this embodiment, the indoor fan is controlled to operate for a first preset time period according to the preset rotation speed, and/or the electronic expansion valve is controlled to maintain for a second preset time period according to the first preset opening, and then the electronic expansion valve is closed, where the preset rotation speed, the first preset time period, the first preset opening and the second preset time period can be adjusted accordingly according to the user requirement, for example, the setting range of the first preset opening is 72-150, which is not limited in this embodiment. For example, assuming that the preset rotational speed is V, the first preset duration is T 1 The first preset opening degree is EEV 1 A second preset time length is T 2 When a person is detected in the room, in this embodiment, the rotation speed of the indoor fan is adjusted to be V, and the time is delayed by T 1 Closing after seconds, and simultaneously adjusting the opening of the electronic expansion valve to EEV 1 And is turned off after a second preset time period has elapsed.
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 for a first preset time period according to the preset rotation speed, and/or the electronic expansion valve is controlled to be closed after maintaining for a second preset time period according to the second preset opening, where the preset rotation speed, the first preset time period, the first preset opening and the second preset time period can be adjusted accordingly according to the user requirement, the setting range of the second preset opening is 150-300, and this is not limited in this embodiment. For example, assuming that the preset rotational speed is V, the first preset duration is T 1 The first preset opening degree is EEV 2 A second preset time length is T 2 When a person is detected in the room, in this embodiment, the rotation speed of the indoor fan is adjusted to be V, and the time is delayed by T 1 Closing after seconds, and simultaneously adjusting the opening of the electronic expansion valve to EEV 2 And is turned off after a second preset time period has elapsed. It should be emphasized that the difference is that in the room compared to the case where there is a person in the roomThe opening degree of the electronic expansion valve is smaller than that of the electronic expansion valve when no person exists in the room, namely the first preset opening degree is smaller than the second preset opening degree.
According to the embodiment, when the detection result is that a person exists in a room, the indoor fan is controlled to be closed after a first preset time period is operated according to the preset rotating speed, and/or the electronic expansion valve is controlled to be closed after a second preset time period is maintained according to the first preset opening, and when the detection result is that no person exists in the room, the indoor fan is controlled to be closed after the first preset time period is operated according to the preset rotating speed, and/or the electronic expansion valve is controlled to be closed after a second preset time period is maintained according to the second preset opening, wherein the first preset opening is smaller than the second preset opening, the reliability of the compressor is guaranteed through a mode of controlling the indoor fan and the electronic expansion valve to be closed in a time delay manner, and meanwhile, the comfort of a user in the shutdown process of the compressor can be guaranteed through opening settings of different electronic expansion valves.
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.
Based on the first embodiment or the second embodiment described above, a third embodiment of a control method of an air conditioner of the present invention is presented.
Taking the first embodiment as an example, the method for obtaining the temperature difference between the high-pressure temperature and the low-pressure temperature of the cooling flow path in the air conditioner further includes:
step S00: and controlling the outdoor fan to be closed after a third preset time period is operated according to the rotating speed corresponding to the stopping time of the compressor, and controlling the electromagnetic valve to be closed after the third preset time period is opened.
It can be understood that a branch is arranged between the air return port and the air outlet of the compressor of the air conditioner, an electromagnetic valve is arranged on the branch and used for controlling the on-off of the air outlet and the air return port, when the electromagnetic valve is opened, part of refrigerant directly passes through the air return port from the air outlet, and the part of refrigerant does not participate in a refrigeration cycle system; when the electromagnetic valve is closed, all refrigerants are directly discharged from the exhaust port to the outdoor heat exchanger. In order to get the acquired heightIn this embodiment, after the compressor is turned off, the outdoor fan is controlled to be turned off after a third preset time is operated according to the rotation speed corresponding to the time of the compressor, and the electromagnetic valve is controlled to be turned on for a third preset time, for example, the electromagnetic valve SV1 of the outdoor unit is controlled to be turned on for a duration T 3 After closing, while the outdoor fan keeps running T 3 Stopping after the time, and setting the third preset duration according to the actual requirement of the user, which is not limited in this embodiment. 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 obtained.
In this embodiment, when the ambient temperature of the indoor room reaches the set temperature and reaches Wen Tingji, the operation frequency of the compressor starts to be reduced, and when the frequency is reduced to 0, it is determined that the compressor reaches Wen Tingji at this time.
In this embodiment, the outdoor fan is controlled to be turned off after a third preset time period is run according to the rotation speed corresponding to the shutdown time of the compressor, and the electromagnetic valve is controlled to be turned on for a third preset time period and then turned off, and the high-pressure temperature and the low-pressure temperature are more accurately obtained by controlling the time delay of the outdoor fan and the electromagnetic valve to be turned off, so that the reliability of the compressor is further ensured.
In addition, the embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a control program of the air conditioner, and the control program of the air conditioner realizes the steps of the control method of the air conditioner when being executed by a processor.
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 for an air conditioner according to an embodiment of the present invention includes:
and the detection module 10 is used for acquiring a temperature difference between the high-pressure temperature and the low-pressure temperature of the cooling flow path in the air conditioner when the stop of the compressor is detected.
It should be noted that, the multi-split air conditioning system plays an increasingly important role in the field of home central air conditioning by virtue of the technical characteristics of accurate control, free use, convenient installation, high efficiency, energy saving and the like. The multi-split system has the advantages that one indoor unit is connected with a plurality of indoor units, and the multi-split system can be subjected to misoperation of a user, multiple times of compressor start attempts under some conditions, and the like, so that the compressors are started and stopped frequently, and the situation that the compressors are started with pressure difference is caused. While compressor start-up with pressure differential is risky as follows: the compressor oil is likely to be reversely discharged from the compressor due to the failure of the start of the compressor, so that the compressor is short of oil, the compressor can be damaged after long-time operation, and the service life is shortened.
In order to solve the above technical problems, the embodiment monitors the pressure difference of the compressor in real time after the compressor is stopped, and reduces the pressure difference before restarting the compressor by adjusting the opening of the electronic expansion valve of the indoor unit or the wind speed of the indoor unit, thereby improving the reliability of the compressor.
In a specific implementation, in this embodiment, after the shutdown of the compressor is detected, a temperature difference between a high-pressure temperature and a low-pressure temperature of a cooling flow path in the air conditioner is obtained in real time, where the high-pressure temperature is a temperature of the refrigerant after condensation in the outdoor heat exchanger.
Optionally, the high-pressure temperature obtaining manner in this embodiment 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 of 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 easily occurs, so that the problem of inaccurate detection is caused.
In another embodiment, a high pressure sensor is arranged in the outdoor heat exchanger, the high pressure sensor is used for detecting the high pressure of the outdoor heat exchanger to obtain the condensation temperature corresponding to the high pressure, the high pressure sensor is used for directly detecting the high pressure to obtain the high pressure temperature, and the condensation temperature corresponding to the high pressure is determined to obtain the high pressure temperature, so that the obtained high pressure temperature is more accurate, but when the high pressure sensor is arranged in the outdoor heat exchanger, the production process is difficult to manufacture, and the difficulty in manufacturing the outdoor heat exchanger is high.
In still another embodiment, a high pressure sensor is disposed on the exhaust pipe of the compressor, the high pressure sensor detects the high pressure of the exhaust port of the compressor to obtain the condensation temperature corresponding to the high pressure, and the high pressure sensor can be directly welded on the exhaust pipe as the high pressure temperature, so that the operation is convenient, and the accuracy of the determination of the high pressure temperature and the convenience of the production process can be ensured.
In another embodiment, the air suction pipe of the compressor is provided with a low pressure sensor, the low pressure sensor is used for detecting the low pressure of the air return port of the compressor to obtain the evaporating temperature corresponding to the low pressure, and the low pressure sensor can be directly welded on the exhaust pipe as the low temperature.
In order to make the technical scheme related to the implementation mode of each control method 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 refrigerant flow paths, and the outdoor heat exchanger 6 is respectively connected with a plurality of indoor heat exchangers 2, each indoor heat exchanger is connected with an electronic expansion valve 3 and an indoor fan 1, the compressor 10 is connected with the outdoor heat exchanger 6, the refrigerant flow path between the compressor 10 and the outdoor heat exchanger 6 is provided with a high pressure sensor 8, the outdoor unit part is also provided with an outdoor fan 4 and an electronic expansion valve 5, each indoor unit is composed of the indoor heat exchanger 2, the indoor fan 1 and the electronic expansion valve 3, the indoor heat exchanger 2 is linked with the compressor 10, the refrigerant flow path between the compressor 10 and the indoor heat exchanger 2 is provided with a low pressure sensor 9, and when refrigeration is performed, the refrigerant flows from the compressor 10 through the outdoor heat exchanger 6 to be condensed, then evaporated through the indoor heat exchanger 2 and then returns to the compressor 10
And the control module 20 is configured to control the opening of the electronic expansion valve and/or the rotational 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 a specific implementation, the high-pressure temperature and the low-pressure temperature are temperatures after the refrigerant in the refrigerant flow path is condensed and evaporated, the temperatures correspond to the pressure of the compressor, the temperature difference is directly reflected in the pressure difference of the compressor, and the pressure difference of the compressor is larger as the temperature difference is larger, so that when the temperature difference is larger than or equal to a preset threshold value, the pressure difference of the compressor can be determined to be larger at the moment, wherein the preset threshold value can be set according to the actual situation, and the embodiment is not limited. In this case, in this embodiment, the opening degree of the electronic expansion valve and/or the rotation speed of the indoor fan may be controlled, for example, the electronic expansion valve and/or the indoor unit may be controlled to be turned off 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 safe range, in this embodiment, the indoor fan and the electronic expansion valve may be directly closed, without performing the operation of reducing the pressure difference, and when a new set temperature is received or the indoor temperature changes, the compressor may be directly stopped and restarted.
In the embodiment, when the stop of the compressor is detected, the temperature difference between the high-pressure temperature and the low-pressure temperature of the cooling flow path in the air conditioner is obtained; when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold, judging the pressure difference of the compressor before stopping and starting through the high-pressure temperature and the low-pressure temperature measured in the refrigerant flow path, and when the temperature difference is greater than or equal to the preset threshold, namely the pressure difference of the compressor is greater, regulating the opening 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 of the compressor is within a safety range before starting, and further improving the reliability of the compressor.
It should be understood that the foregoing is illustrative only and is not limiting, and that in specific applications, those skilled in the art may set the invention as desired, and the invention is not limited thereto.
It should be noted that the above-described working procedure is merely illustrative, and does not limit the scope of the present invention, and in practical application, a person skilled in the art may select part or all of them according to actual needs to achieve the purpose of the embodiment, which is not limited herein.
In addition, technical details not described in detail in the present embodiment may refer to the control method of the air conditioner provided in any embodiment of the present invention, which is not described herein.
Furthermore, it should 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 one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a computer readable storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk) and including several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (9)

1. The control method of the air conditioner is characterized in that a compressor, an outdoor heat exchanger and an indoor heat exchanger 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, the air conditioner further comprises an outdoor fan, a branch is arranged between an air return port and an air outlet of the compressor of the air conditioner, an electromagnetic valve is arranged on the branch and used for controlling the on-off of the air outlet and the air return port, and the control method of the air conditioner comprises the following steps:
when the compressor is detected to stop, acquiring a temperature difference value between a high-pressure temperature and a low-pressure temperature of a cooling flow path in the air conditioner; and
when the temperature difference is greater than or equal to a preset threshold, controlling the opening of the electronic expansion valve and/or the rotating speed of the indoor fan until the temperature difference is smaller than the preset threshold;
the outdoor fan is controlled to be closed after a third preset time period is operated according to the rotating speed corresponding to the stopping time of the compressor, and the electromagnetic valve is controlled to be closed after the third preset time period is opened;
and after the outdoor fan and the electromagnetic valve are closed, returning to the step of acquiring the temperature difference between the high-pressure temperature and the low-pressure temperature of the cooling flow path in the air conditioner.
2. The control method of an air conditioner according to claim 1, wherein the controlling the opening degree of the electronic expansion valve and/or the rotational 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.
3. The control method of an air conditioner according to claim 2, wherein the controlling the opening degree of the electronic expansion valve and/or the rotational speed of the indoor fan according to the detection result includes:
when the detection result is that people exist in the room, the indoor fan is controlled to operate for a first preset time period according to the preset rotating speed, and/or the electronic expansion valve is controlled to be closed after maintaining a second preset time period according to the first preset opening.
4. The control method of an air conditioner according to claim 2, wherein the controlling the opening degree of the electronic expansion valve and/or the rotational speed of the indoor fan according to the detection result includes:
when the detection result is that no person is in the room, the indoor fan is controlled to run for a first preset time period according to the preset rotating speed, and/or the electronic expansion valve is controlled to be closed after maintaining for a second preset time period according to a second preset opening, wherein the first preset opening is smaller than the second preset opening.
5. The control method of an air conditioner according to any one of claims 1 to 4, wherein a return air port of the compressor is provided with a low pressure sensor, an exhaust air port of the compressor is provided with a high pressure sensor, the control method of an air conditioner 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 cooling flow path in the air conditioner; and
and detecting the temperature corresponding to the pressure of the exhaust port of the compressor by the high-pressure sensor to obtain the high-pressure temperature of the cooling flow path in the air conditioner.
6. The control method of an air conditioner according to any one of claims 1 to 4, characterized in that the control method of an air conditioner further comprises:
and when the temperature difference is smaller than a preset threshold, closing the indoor fan and the electronic expansion valve.
7. The utility model provides a controlling means of air conditioner, its characterized in that, compressor, outdoor heat exchanger and the indoor heat exchanger of air conditioner pass through the refrigerant flow path and connect gradually, 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 air conditioner still includes outdoor fan, be equipped with the branch road between the return air port and the gas vent of the compressor of air conditioner, set up the solenoid valve on the branch road, the solenoid valve is used for controlling the gas vent with the return air port break-make, 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 the cooling flow path in the air conditioner when the compressor is detected to stop;
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 smaller than the preset threshold value;
the control module is used for controlling the outdoor fan to be closed after running for a third preset time according to the rotating speed corresponding to the stop time of the compressor and controlling the electromagnetic valve to be closed after being opened for the third preset time; and after the outdoor fan and the electromagnetic valve are closed, returning to the step of acquiring the temperature difference between the high-pressure temperature and the low-pressure temperature of the cooling flow path in the air conditioner.
8. 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 configured to implement the control method of an air conditioner according to any one of claims 1 to 6.
9. A computer-readable storage medium, wherein a control program of an air conditioner is stored on the computer-readable storage medium, which when executed by a processor, implements the control method of an air conditioner according to any one of claims 1 to 6.
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