CN111426102B - System, method and device for improving oil return reliability of variable frequency air conditioner - Google Patents

System, method and device for improving oil return reliability of variable frequency air conditioner Download PDF

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Publication number
CN111426102B
CN111426102B CN202010283497.8A CN202010283497A CN111426102B CN 111426102 B CN111426102 B CN 111426102B CN 202010283497 A CN202010283497 A CN 202010283497A CN 111426102 B CN111426102 B CN 111426102B
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oil return
frequency
compressor
preset
air conditioner
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CN111426102A (en
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李海利
田涛
张中强
杨明登
来盼盼
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • 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
    • F24F11/61—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
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a system, a method and a device for improving oil return reliability of a variable frequency air conditioner, which relate to the technical field of air conditioners and comprise the following steps: acquiring a first frequency of a compressor, wherein the first frequency is an operating frequency of the compressor after the compressor operates for a first time period; judging whether the first frequency meets an oil return preset condition or not; and if so, controlling the opening and closing of the oil return electromagnetic valve. Aiming at the variable frequency air conditioner, the opening and closing time of the electromagnetic valve is reasonably controlled by judging the running frequency of the variable frequency air conditioner, so that oil brought out from the compressor along with a refrigerant is ensured to quickly return to the compressor to the maximum extent, and the oil return reliability of the variable frequency air conditioner is improved.

Description

System, method and device for improving oil return reliability of variable frequency air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a system, a method and a device for improving oil return reliability of a variable frequency air conditioner.
Background
When the variable frequency air conditioner operates, the refrigerant is compressed into high-temperature and high-pressure gas in the compressor, when the gas is discharged from the exhaust port of the compressor, a part of lubricating oil can be taken away, and the lubricating oil gradually deposits in the evaporator and the condenser in a layering manner along with the circulating flow of the refrigerant. The running of the lubricating oil brings inconvenience to the operation of the air conditioner, and on one hand, the oil stored in the heat exchanger influences the heating effect of the air conditioner; on the other hand, the compressor lacks lubricating oil and causes poor lubrication, the abrasion is increased, and the service life of the compressor is seriously influenced.
The oil return reliability of the variable frequency air conditioner is always difficult in the industry, and is vital to prolonging the service life of the compressor. The oil return method used by the existing variable frequency air conditioner is to turn high and medium frequency at regular time to force oil return, the oil quantity of the compressor cannot be monitored in real time, and further targeted oil return control cannot be performed according to the real-time state of the compressor, so that the risk of poor lubrication or untimely oil return in short time still exists at a certain period of starting or stopping, and the service life of the compressor is influenced.
Disclosure of Invention
The invention solves the problem of how to improve the oil return reliability of the variable frequency air conditioner according to the real-time state of the compressor.
In order to solve the above problems, the present invention provides a system for improving oil return reliability of a variable frequency air conditioner, comprising: the oil separator comprises a compressor, an oil separator, a capillary tube and an oil return electromagnetic valve, wherein the inlet end of the oil separator is connected to the exhaust port of the compressor, and the first outlet of the oil separator is connected to a normal operation branch through an exhaust pipeline; the inlet end is connected to the exhaust port, a second outlet of the oil separator is connected to the capillary tube, the capillary tube is connected to the oil return electromagnetic valve, and the oil return electromagnetic valve is connected to the air return pipeline to form an oil return branch.
Therefore, the normal operation branch is arranged, so that the normal exhaust operation of the compressor is ensured; the oil return branch is formed by additionally arranging the capillary tube and the oil return electromagnetic valve, the inlet end of the oil separator is connected with the capillary tube, throttling and pressure reduction are carried out through the capillary tube, too much high-temperature refrigerant is prevented from entering return air, then the capillary tube is connected with the oil return electromagnetic valve, the oil return electromagnetic valve is connected with an air return port of the compressor, and oil deposited on the lower portion of the oil separator is returned to the compressor through the air return port by effectively utilizing pressure difference. By reasonably controlling the opening and closing time of the oil return electromagnetic valve, the oil brought out from the compressor along with the refrigerant is ensured to quickly return to the compressor to the maximum extent, the oil return reliability is improved, the effective operation of the variable frequency air conditioner is ensured, and the service life of the compressor is prolonged.
Further, the oil separator includes a multi-layer screen structure.
Therefore, the multi-layer filter screen structure is additionally arranged, so that oil brought out from the exhaust port is recycled to the bottom of the oil separator as much as possible, the oil return efficiency is improved, the air conditioner is promoted to operate effectively to the greatest extent, and the use of a user is facilitated.
A second objective of the present invention is to provide a method for improving oil return reliability of an inverter air conditioner, for controlling the system for improving oil return reliability of an inverter air conditioner, including:
acquiring a first frequency of a compressor, wherein the first frequency is an operating frequency of the compressor after the compressor operates for a first time period;
judging whether the first frequency meets an oil return preset condition or not;
and if so, controlling the opening and closing of the oil return electromagnetic valve.
Therefore, the running state of the compressor is monitored in real time through the judgment of the running frequency of the compressor, the opening and closing of the oil return electromagnetic valve are controlled in a targeted manner according to the situation, and the oil return reliability of the system is improved through the reasonable opening and closing control of the oil return electromagnetic valve. In conclusion, the invention controls the oil return electromagnetic valve according to the real-time running state of the compressor, ensures the effective and reliable oil return running of the system, not only promotes the air conditioner to continuously and effectively run, but also avoids the abrasion of the compressor caused by poor oil return.
Further, the preset oil return condition comprises a preset first oil return condition which is as follows: the first frequency is greater than or equal to a first preset oil return frequency; if satisfy, then control oil return solenoid valve's switching includes: and if the first oil return preset condition is met, controlling the oil return electromagnetic valve to be kept closed.
From this, set up first oil return and preset the condition, confirm the higher condition of frequency, the system oil return effect is better this moment to carry out effectual control to the higher condition of compressor frequency, effective oil return control when guaranteeing the air conditioner high frequency operation. The condition that the frequency of the compressor is high means that the oil return effect is good at the moment, so that an oil return electromagnetic valve does not need to be opened, redundant oil return action is avoided, and effective oil return control during high-frequency operation of the air conditioner is guaranteed.
Further, the oil return preset condition includes a second oil return preset condition, and the second oil return preset condition is: the first frequency is between a first preset oil return frequency and a second preset oil return frequency, wherein the first preset oil return frequency is greater than the second preset oil return frequency; if satisfy, then control oil return solenoid valve's switching includes: and if the second oil return preset condition is met, controlling the oil return electromagnetic valve to be opened for a third time period and then closed every second time period.
Therefore, the second oil return preset condition is set, the condition of moderate frequency is confirmed, and the oil return effect of the system is moderate at the moment, so that the condition of moderate frequency of the compressor is effectively controlled, and the effective oil return control of the air conditioner during the operation of moderate frequency is ensured. The condition that the frequency of the compressor is moderate means that the oil return effect is moderate at the moment, so that the oil return effect can be ensured only by timing oil return. At the moment, when the air conditioner runs for a period of time, the oil return electromagnetic valve is opened and closed after being continuously opened for a period of time, and the oil return electromagnetic valve is periodically opened and closed at regular time, so that effective oil return control of the air conditioner when the air conditioner runs at moderate frequency is guaranteed.
Further, the oil return preset conditions include a third oil return preset condition, and the third oil return preset condition is that: the first frequency is less than a second preset oil return frequency; if so, controlling the opening and closing of the oil return electromagnetic valve comprises the following steps: and if the third oil return preset condition is met, controlling the oil return electromagnetic valve to be kept open.
Therefore, a third oil return preset condition is set, the condition of low frequency is confirmed, the oil return effect of the system is poor at the moment, so that effective control is performed on the condition of low frequency of the compressor, and effective oil return control of the air conditioner during operation at low frequency is guaranteed. The condition that the frequency of the compressor is low means that the oil return effect is poor at the moment, so that the oil return control valve needs to be continuously opened to ensure the oil return effect. At the moment, the continuous opening of the oil return control valve is controlled to ensure that the system is helped to continuously return oil, so that the compressor is promoted to continuously and effectively operate, and the effective oil return control of the air conditioner in the low-frequency operation is ensured.
Further, still include: and when the compressor is started, the oil return electromagnetic valve is controlled to be opened.
Therefore, when the compressor is detected to be started, the oil return electromagnetic valve is immediately opened, so that the phenomenon that a large amount of oil is brought out along with the refrigerant in the starting stage to cause short-time oil shortage of the compressor is avoided. The oil return electromagnetic valve is started immediately when the machine is started, so that the abrasion of the compressor caused by poor oil return is avoided, and the convenience of use of a user is ensured.
Further, still include: and when the compressor is shut down, the oil return electromagnetic valve is controlled to be opened.
Therefore, when the compressor is shut down, the oil return electromagnetic valve is immediately opened, so that oil at the lower end of the oil separator after shutdown can be guaranteed to be timely sucked into an air return port of the compressor, pressure balance can be quickly realized, and system impact caused during shutdown is relieved. In conclusion, the oil return electromagnetic valve is immediately closed when the air conditioner is shut down, so that the abrasion of the compressor caused by poor oil return is avoided, and the convenience of use of a user is ensured.
Further, before controlling the opening and closing of the oil return solenoid valve, the method further includes:
acquiring the high-pressure side pressure and the low-pressure side pressure of the compressor;
judging whether the high-pressure side pressure and/or the low-pressure side pressure meet a protection control condition;
and if so, forcibly controlling the opening and closing of the oil return electromagnetic valve.
Therefore, the discharge pressure of the compressor is judged in real time by monitoring the high-pressure side pressure and the low-pressure side pressure of the compressor while controlling the oil return. And setting a protection control condition, and judging whether the compressor is in a reliable operation state. Therefore, the invention controls the opening and closing of the oil return electromagnetic valve by force, preferentially ensures the reliability of the compressor while controlling the oil return, and further ensures the safe operation of the system.
Further, the protection control conditions include a first protection control condition that: the ratio of the high-pressure side pressure to the low-pressure side pressure is smaller than a preset pressure ratio value; if yes, the forced control of the opening and closing of the oil return electromagnetic valve comprises the following steps: and if the first protection control condition is met, forcibly closing the oil return electromagnetic valve.
Therefore, whether the compressor runs reliably is judged according to the ratio of the high-pressure side pressure to the low-pressure side pressure, the reliability of the compressor is preferentially ensured while oil return control is carried out, and the safe running of the system is further ensured. When the ratio of the high-pressure side pressure to the low-pressure side pressure is smaller than the preset pressure ratio, the situation that the compressor has insufficient air suction and incomplete air exhaust is shown, the driving force of a rotor in the cylinder is reduced, the compressor is stopped frequently, the electromagnetic valve is closed forcibly at the moment, and the reliability of the compressor is guaranteed preferentially.
Further, the protection control condition includes a second protection control condition, and the second protection control condition is: the high side pressure exceeds a high pressure preset value; if yes, the forced control of the opening and closing of the oil return electromagnetic valve comprises the following steps: and if the second protection control condition is met, forcibly opening the oil return electromagnetic valve.
Therefore, whether the compressor runs reliably or not is judged through the high-pressure side pressure, the reliability of the compressor is preferentially ensured while oil return control is carried out, and the safe running of the system is further ensured. When the high-pressure side pressure exceeds a high-pressure preset value, the system load is overlarge, at the moment, the electromagnetic valve is forcibly opened to buffer pressure impact, the system reliability is guaranteed by unloading, and the compressor reliability is preferentially guaranteed.
The third purpose of the invention is to provide a device for improving the oil return reliability of the inverter air conditioner, which reasonably controls the opening and closing of an oil return electromagnetic valve according to the state of the compressor of the inverter air conditioner, and ensures the reliability of oil return.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a promote inverter air conditioner oil return reliability's device includes:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first frequency of a compressor, and the first frequency is an operating frequency of the compressor after the compressor operates for a first time;
the processing unit is used for judging whether the first frequency meets an oil return preset condition or not;
and the control unit is used for controlling the opening and closing of the oil return electromagnetic valve if the oil return preset condition is met.
Compared with the prior art, the device for improving the oil return reliability of the variable frequency air conditioner and the method for improving the oil return reliability of the variable frequency air conditioner have the same beneficial effects, and are not repeated herein.
The fourth purpose of the invention is to provide an air conditioner, which reasonably controls the opening and closing of an oil return electromagnetic valve according to the state of a variable frequency air conditioner compressor, and ensures the reliability of oil return.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner comprises a computer readable storage medium and a processor, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and executed by the processor, the method for improving the oil return reliability of the variable frequency air conditioner is realized.
Compared with the prior art, the air conditioner and the method for improving the oil return reliability of the variable frequency air conditioner have the same beneficial effects, and are not repeated herein.
The fifth purpose of the invention is to provide a device for improving the oil return reliability of the inverter air conditioner, which reasonably controls the opening and closing of an oil return electromagnetic valve according to the state of the compressor of the inverter air conditioner, and ensures the reliability of oil return.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a computer readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the method for improving oil return reliability of the variable frequency air conditioner is realized.
Compared with the prior art, the computer readable storage medium and the method for improving the oil return reliability of the variable frequency air conditioner have the same beneficial effects, and are not repeated herein.
Drawings
FIG. 1 is a schematic structural diagram of a system for improving oil return reliability of a variable frequency air conditioner in an embodiment of the invention;
FIG. 2 is a schematic flow chart illustrating a method for improving oil return reliability of a variable frequency air conditioner according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating the forced control of the opening and closing of the oil return solenoid valve according to the embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a range of pressure ratios and preset values in the method for improving the oil return reliability of the inverter air conditioner in the embodiment of the invention;
FIG. 5 is a schematic structural diagram of a device for improving oil return reliability of a variable frequency air conditioner according to an embodiment of the present invention;
description of reference numerals:
1-compressor, 101-exhaust port, 102-exhaust pipeline, 103-return gas pipeline, 104-return gas port, 2-oil separator, 21-inlet port, 22-first outlet, 23-second outlet, 3-capillary tube, 4-return electromagnetic valve, 5-four-way valve, 6-condenser, 7-evaporator, 8-gas-liquid separator, 9-compressor reservoir, 10-low pressure stop valve, 11-high pressure stop valve, 12-throttle capillary tube, 13-outdoor fan, 14-centrifugal fan, 1501-exhaust temperature sensor, 1502-return gas temperature sensor, 1503-outdoor temperature sensor, 1504-outer disk temperature sensor, 1505-indoor outlet air temperature sensor, 1506-inner disk temperature sensor, 1507-indoor temperature sensor, 1508-low pressure sensor, 1509-high pressure sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
When the variable frequency air conditioner operates, when the refrigerant is discharged from the exhaust port of the compressor, a part of lubricating oil is taken away and gradually layered and deposited in the evaporator and the condenser. The running of the lubricating oil brings inconvenience to the operation of the air conditioner, and on one hand, the oil stored in the heat exchanger influences the refrigerating and heating effects of the air conditioner; on the other hand, the compressor lacks lubricating oil, which results in poor lubrication and shortened service life. The oil return method used by the existing variable frequency air conditioner specifically comprises the following steps: if the compressor operating frequency is cumulatively below 58Hz for 180 minutes, oil return operation is entered. And during mode conversion, manual shutdown or protective shutdown, the timing is not cleared. And after the compressor is restarted, timing is continued. And during the 180-minute timing period, if the running frequency of the compressor is greater than 72Hz for more than 5 minutes continuously, resetting the timer. Therefore, the oil return method used by the existing variable frequency air conditioner is to periodically turn high-medium frequency forced oil return, and further targeted oil return control cannot be performed according to the real-time state of the compressor, so that the risk of poor lubrication and the risk of poor short-time oil return still exist, and the service life of the compressor is influenced. The invention provides a system, a method and a device for improving oil return reliability of a variable frequency air conditioner, aiming at the problem of how to improve the oil return reliability of the variable frequency air conditioner according to the real-time state of a compressor.
With reference to fig. 1, fig. 1 is a schematic structural diagram of a system for improving oil return reliability of an inverter air conditioner according to an embodiment of the present invention, and an embodiment of the present invention provides a system for improving oil return reliability of an inverter air conditioner, including: the device comprises a compressor 1, an oil separator 2, a capillary tube 3 and an oil return electromagnetic valve 4, wherein the inlet end 21 of the oil separator 2 is connected to the exhaust port 101 of the compressor 1, and the first outlet 22 of the oil separator 2 is connected to a normal operation branch through an exhaust pipeline 102; the inlet end 21 is connected to the exhaust port 101, the second outlet 23 of the oil separator 2 is connected to the capillary tube 3, the capillary tube 3 is connected to the oil return solenoid valve 4, and the oil return solenoid valve 4 is connected to the return air pipe 103, forming an oil return branch. Therefore, the normal operation branch is arranged to ensure the normal exhaust operation of the compressor 1; an oil return branch is formed by additionally arranging a capillary tube 3 and an oil return electromagnetic valve 4, the inlet end 21 of the oil separator 2 is connected with the capillary tube 3, throttling and pressure reduction are carried out through the capillary tube 3, too much high-temperature refrigerant is prevented from entering return air, then the capillary tube 3 is connected with the oil return electromagnetic valve 4, the oil return electromagnetic valve 4 is connected with an air return pipeline 103, and oil deposited on the lower portion of the oil separator 2 returns to the compressor 1 through the air return pipeline 103 by effectively utilizing pressure difference. By reasonably controlling the opening and closing time of the oil return electromagnetic valve 4, the oil brought out from the compressor 1 along with the refrigerant is ensured to quickly return to the compressor 1 to the maximum extent, the oil return reliability is improved, the effective operation of the variable frequency air conditioner is ensured, and the service life of the compressor 1 is prolonged.
Optionally, the system for improving the oil return reliability of the variable frequency air conditioner provided by the embodiment of the invention further includes a four-way valve 5, a gas-liquid separator 8 and a compressor reservoir 9, in the normal branch, the exhaust port 101 is connected to the inlet end 21 of the oil separator 2, the first outlet 22 of the oil separator 2 is connected to the four-way valve 5, the four-way valve 5 is connected to the gas-liquid separator 8, the gas-liquid separator 8 is connected to the compressor reservoir 9, and the compressor reservoir 9 is connected to the return port 104, so as to complete the normal circulation of the refrigerant and ensure the normal refrigerant circulation operation, wherein the exhaust pipeline 102 is a pipeline between the oil separator 2 and the four-way valve 5. In the oil return branch, the air outlet 101 is connected to the inlet end 21, the second outlet 23 of the oil separator 2 is connected to the capillary tube 3, the capillary tube 3 is connected to the oil return solenoid valve 4, the oil return solenoid valve 4 is connected to the compressor reservoir 9, and the compressor reservoir 9 is connected to the air return port 104, wherein the air return line 103 is a line between the gas-liquid separator 8 and the compressor reservoir 9. Thereby utilizing the pressure difference to carry out effective oil return control. In the embodiment of the present invention, the diameter of the first outlet 22 is larger than that of the second outlet 23, which is beneficial to the normal circulation and oil return control of the system.
Optionally, the system for improving the oil return reliability of the inverter air conditioner provided by the embodiment of the invention further includes a condenser 6 and an evaporator 7, so as to complete a normal refrigeration and heating function and promote the circulation of a refrigerant.
Optionally, the system for improving the oil return reliability of the inverter air conditioner provided by the embodiment of the invention further comprises a low-pressure stop valve 10 and a high-pressure stop valve 11, and plays a role in balancing pressure in a normal refrigerant cycle.
Optionally, the system for improving the oil return reliability of the variable frequency air conditioner provided by the embodiment of the invention further comprises an outdoor fan 13 and a centrifugal fan 14, and the heat exchange efficiency of the indoor unit and the outdoor unit is improved through the rotating speed in a normal cycle.
Optionally, the system for improving oil return reliability of the inverter air conditioner according to the embodiment of the present invention further includes a plurality of sensors, where the exhaust temperature sensor 1501 and the return temperature sensor 1502 respectively detect an exhaust temperature and a return temperature of the compressor; an outdoor temperature sensor 1503 and an indoor temperature sensor 1507 respectively detect an outdoor temperature and an indoor temperature; an outer disc temperature sensor 1504 and an inner disc temperature sensor 1506 respectively detect the temperature of the outdoor side coil and the temperature of the indoor side coil; a low pressure sensor 1508 and a high pressure sensor 1509 respectively detect the low pressure side pressure and the high pressure side pressure of the compressor 1; the indoor outlet air temperature sensor 1505 detects the outlet air temperature of the centrifugal fan 14.
Optionally, the oil separator 2 comprises a multi-layer screen structure. The multi-layer filter screen structure is used for recovering the oil brought out from the air outlet 101 to the bottom of the oil separator 2 to the maximum extent, so that the oil returning efficiency is improved, the effective operation of the air conditioner is promoted to the maximum extent, and the use of a user is facilitated by additionally arranging the multi-layer filter screen structure and recovering the oil brought out from the air outlet 101 to the bottom of the oil separator 2 as much as possible.
According to the system for improving the oil return reliability of the variable frequency air conditioner, the capillary tube 3 and the oil return electromagnetic valve 4 are arranged, the oil return branch is additionally arranged, and the throttling function of the capillary tube 3 and the opening and closing control of the oil return electromagnetic valve 4 are effectively utilized; the inlet end 21 of the oil separator 2 is connected with the capillary tube 3, and then is connected with the oil return electromagnetic valve 4 through the capillary tube 3, the oil return electromagnetic valve 4 is connected with the return port 104 of the compressor 1, and the oil deposited at the lower part of the oil separator 2 returns to the compressor 1 through the return port 104 by effectively utilizing the pressure difference. The system structure of the invention ensures the normal operation of the system through the two branches, simultaneously promotes the oil brought out along with the refrigerant to the maximum extent, quickly returns to the compressor 1 to the maximum extent, ensures the effective operation of the variable frequency air conditioner, and improves the reliability of the oil return of the system.
Referring to fig. 2, fig. 2 is a schematic flow chart of a method for improving oil return reliability of an inverter air conditioner according to an embodiment of the present invention, and an embodiment of the present invention provides a method for improving oil return reliability of an inverter air conditioner, where the method is used to control the system for improving oil return reliability of an inverter air conditioner, and includes steps S1 to S3:
in step S1, a first frequency of the compressor 1 is obtained, wherein the first frequency is an operating frequency of the compressor 1 after a first period of operation. Thus, the operating state of the compressor 1 is monitored in real time by judging the operating frequency of the compressor 1.
Optionally, determining the first frequency comprises: alternating current in a power grid is converted into square wave pulses to be output, the rotating speed of a motor for driving the compressor 1 can be controlled by adjusting the frequency of the square wave pulses, and the first frequency of the variable-frequency compressor 1 is detected by detecting the frequency conversion of the square wave pulses. Therefore, the first frequency is efficiently and accurately calculated through frequency conversion, and the running state of the compressor 1 is accurately judged.
In the embodiment of the present invention, the value range of the first duration is 3min to 5 min. The first duration is related to the compressor 1 up-conversion rate and the control mode, and is an experimental duration value from starting to frequency stabilization. Therefore, the appropriate first time length is set so that the running frequency of the air conditioner compressor 1 can be obtained after the air conditioner compressor runs stably, and accurate judgment is guaranteed.
In step S2, it is determined whether the first frequency meets a preset oil return condition. Therefore, by setting the oil return preset condition, the operation condition of the compressor 1 is divided into a plurality of states so as to perform corresponding control for different states.
Optionally, the preset oil return conditions include a preset first oil return condition, and the preset first oil return condition is: the first frequency is greater than or equal to a first preset oil return frequency. From this, set up first oil return and preset the condition, confirm the higher condition of frequency, the system oil return effect is better this moment to carry out effectual control to the higher condition of compressor 1 frequency, effective oil return control when guaranteeing the air conditioner high frequency operation.
Optionally, the oil return preset condition includes a second oil return preset condition, and the second oil return preset condition is: the first frequency is between a first preset oil return frequency and a second preset oil return frequency, wherein the first preset oil return frequency is greater than the second preset oil return frequency. Therefore, the second oil return preset condition is set, the condition of moderate frequency is confirmed, and the oil return effect of the system is moderate at the moment, so that the condition of moderate frequency of the compressor 1 is effectively controlled, and the effective oil return control of the air conditioner during the operation of moderate frequency is ensured.
Optionally, the oil return preset condition includes a third oil return preset condition, and the third oil return preset condition is: the first frequency is less than the second preset oil return frequency. Therefore, a third oil return preset condition is set, the condition of low frequency is confirmed, and the oil return effect of the system is poor at the moment, so that effective control is performed on the condition of low frequency of the compressor 1, and effective oil return control of the air conditioner during operation at low frequency is guaranteed.
In the embodiment of the invention, the value range of the first preset oil return frequency is 60Hz to 70 Hz. The first preset oil return frequency is the minimum experimental value that the oil return electromagnetic valve 4 is closed, and the window machine refrigeration and heating low-load oil return experimental oil level is not lower than the operating frequency of the compressor 1 when the lower end surface of the lower bearing of the compressor 1 is lower. Therefore, a proper frequency threshold value is set, and the conditions of high frequency and moderate frequency are accurately judged.
In the embodiment of the invention, the value range of the second preset oil return frequency is 30Hz to 40 Hz. The second preset oil return frequency is the minimum experimental value that the oil return electromagnetic valve 4 is opened, and the experimental oil level of the window machine for refrigerating and heating high-load oil return is not lower than the operating frequency of the compressor 1 when the lower end surface of the lower bearing of the compressor 1 is opened. Therefore, a proper frequency threshold value is set, and the conditions of low frequency and moderate frequency are accurately judged.
In step S3, if the opening/closing state is satisfied, the opening/closing of the return solenoid valve 4 is controlled. Therefore, the running state of the compressor 1 is monitored in real time through judging the running frequency of the compressor 1, the opening and closing of the oil return electromagnetic valve 4 are controlled in a targeted manner according to conditions, and the oil return reliability of the system is improved through reasonable opening and closing control of the oil return electromagnetic valve 4. In conclusion, the oil return electromagnetic valve 4 is controlled according to the real-time running state of the compressor 1, so that the effective and reliable oil return running of the system is ensured, the air conditioner is promoted to continuously and effectively run, and the abrasion of the compressor 1 caused by poor oil return is avoided.
In the embodiment of the present invention, step S3 includes steps S31 to S33.
In step S31, if the first oil return preset condition is satisfied, the oil return solenoid valve 4 is controlled to remain closed. From this, the higher condition of compressor 1 frequency means that the oil return effect is better this moment, opens oil return solenoid valve 4 and can cause partly exhaust directly to get into return air port 104, reduces compressor 1 compression effect, influences system refrigeration, hot effect, and the frequency is higher this moment, and system oil return effect is better, need not to open the solenoid valve basically, therefore guarantees the air conditioning effect and need not to open oil return solenoid valve 4, avoids unnecessary oil return action to this effective oil return control when guaranteeing the air conditioner high frequency operation.
In step S32, if the second preset oil return condition is satisfied, the oil return solenoid valve 4 is controlled to be opened for a third time period and then closed every second time period. Therefore, the condition that the frequency of the compressor 1 is moderate means that the oil return effect is moderate at the moment, and the oil return effect can be ensured only by timing oil return. At this time, every time the air conditioner runs for a period of time, the oil return electromagnetic valve 4 is opened and closed after being continuously opened for a period of time, and the oil return electromagnetic valve 4 is periodically opened and closed at regular time, so that effective oil return control of the air conditioner during moderate-frequency running is ensured.
In the embodiment of the present invention, the value of the second duration ranges from 50min to 60 min. The second time is obtained through an experimental result, and the random type size and the oil return effect are different. The second time is that when the first frequency is equal to the second preset oil return frequency, the operation is carried out for 24 hours, and the oil level of the high-load oil return experiment of the window mirror of the compressor 1 is not lower than the experimental simulation verification value of the lower end surface of the lower bearing of the compressor 1. And the oil return effect is ensured by setting the reasonable second time length.
In the embodiment of the present invention, the value of the third duration ranges from 3min to 5 min. The third time period is the time for the oil separated and collected by the oil after the second time period of operation to completely return to the return air port 104, and meanwhile, the third time period cannot be shorter than the minimum starting and stopping time required for ensuring the reliability of the return electromagnetic valve 4. And the oil return effect is ensured by setting the third time length reasonably.
In step S33, if the third preset oil return condition is satisfied, the oil return solenoid valve 4 is controlled to remain open. Therefore, the condition that the frequency of the compressor 1 is low means that the oil return effect is poor at the moment, and therefore the oil return control valve needs to be continuously opened to ensure the oil return effect. At this time, the continuous opening of the oil return control valve is controlled to ensure that the system is helped to continuously return oil, so that the compressor 1 is prompted to continuously and effectively operate, and therefore the effective oil return control of the air conditioner in the low-frequency operation is ensured.
In the embodiment of the invention, the method for improving the oil return reliability of the variable frequency air conditioner further comprises a step S4.
In step S4, when the compressor 1 is started, the oil return solenoid valve 4 is controlled to be opened. Therefore, after the compressor 1 is detected to be started, the oil return electromagnetic valve 4 is immediately opened, and the short-time oil shortage of the compressor 1 caused by the fact that a large amount of oil is brought out along with the refrigerant in the starting-up stage is avoided. The oil return electromagnetic valve 4 is started immediately when the compressor is started, so that the abrasion of the compressor 1 caused by poor oil return is avoided, and the convenience of use of a user is ensured.
In the embodiment of the invention, the method for improving the oil return reliability of the variable frequency air conditioner further comprises a step S5.
In step S5, when the compressor 1 is turned off, control opens the oil return solenoid valve 4. Therefore, after the compressor 1 stops, the oil return electromagnetic valve 4 is immediately opened, so that on one hand, oil at the lower end of the oil separator 2 can be ensured to be sucked into the air return port 104 of the compressor 1 in time after the shutdown, on the other hand, the pressure balance can be quickly realized, and the system impact caused during the shutdown is relieved. In conclusion, the oil return electromagnetic valve 4 is immediately closed when the air conditioner is shut down, so that abrasion of the compressor 1 caused by poor oil return is avoided, and the convenience of use of a user is guaranteed.
In the embodiment of the present invention, step S6 is further included before controlling the opening and closing of the oil return solenoid valve. In step S6, before the opening and closing of the oil return solenoid valve are controlled, the pressure of the compressor 1 is monitored in real time, and the opening and closing of the oil return solenoid valve 4 is forcibly controlled in accordance with the pressure of the compressor 1.
Referring to fig. 3, fig. 3 is a schematic flow chart illustrating the forced control of the opening and closing of the oil return solenoid valve 4 according to the embodiment of the present invention. In the embodiment of the present invention, step S6 includes steps S61 to S63.
In step S61, the high-pressure-side pressure and the low-pressure-side pressure of the compressor 1 are acquired. Therefore, the high-pressure side pressure and the low-pressure side pressure of the compressor 1 are monitored, and the exhaust pressure of the compressor 1 is judged in real time, so that the subsequent effective protection control can be realized.
In step S62, it is determined whether the high side pressure and/or the low side pressure satisfies a protection control condition. Thus, the protection control conditions are set to judge whether the compressor 1 is in a reliable operation state or not for subsequent effective protection control.
Optionally, the protection control condition includes a first protection control condition, and the first protection control condition is: the ratio of the high side pressure to the low side pressure is less than the pressure ratio preset value. Therefore, whether the compressor 1 is in reliable operation or not is judged according to the ratio of the high-pressure side pressure to the low-pressure side pressure, the reliability of the compressor 1 is preferentially ensured while oil return control is carried out, and the safe operation of the system is further ensured.
In the embodiment of the present invention, Pcr represents the ratio of the high-side pressure to the low-side pressure, i.e., the compression ratio, P, of the compressor 1High pressureIndicating the high side pressure, PLow pressureIndicating the low side pressure, P0Indicating a pressure ratio preset value. Monitoring the compression ratio Pcr of the compressor 1 to the high-pressure side pressure PHigh pressureLow side pressure PLow pressureWhether or not it is less than the preset pressure ratio value P0. Under the conventional condition, after the oil return electromagnetic valve 4 is opened, the high-temperature and high-pressure exhaust refrigerant is throttled and depressurized through the capillary tube 3, cooled and changed into medium-temperature and medium-pressure refrigerant, and the medium-temperature and medium-pressure refrigerant is mixed with return low-temperature and low-pressure refrigerant liquid, so that the exhaust pressure is reduced to a certain extent, the return pressure is increased, the compression ratio Pcr of the compressor 1 is reduced, and the pressure ratio is reduced to a preset value P0For the minimum compression ratio of the specification of the compressor 1, the compression ratio Pcr of the compressor 1 is less than the preset pressure ratio P0Compressor 1 can cause and inhale inadequately, and the exhaust is not clean, reduces the driving force of rotor in the cylinder, makes compressor 1 frequently shut down, can be different according to compressor 1 and minimum operating frequency.
In the embodiment of the invention, the pressure ratio is preset value P0Min Pcr is compressed for the compressor 1 specification, minimum compressor 1, and thus the pressure ratio is at the preset value P0Reference is made to fig. 4 for ranges of values of (a). FIG. 4 is a schematic diagram of a range of pressure ratio preset values in the method for improving the oil return reliability of the inverter air conditioner according to the embodiment of the present invention, and a ordinate in FIG. 4 is a minimum compressor 1 compression Min Pcr, which is a pressure ratio preset value P0The value of (a).
Optionally, the protection control condition includes a second protection control condition, and the second protection control condition is: the high side pressure exceeds the high pressure preset value. Therefore, whether the compressor 1 is operated reliably or not is judged through the high-pressure side pressure, the reliability of the compressor 1 is preferentially ensured while oil return control is carried out, and the safe operation of the system is further ensured.
In the embodiment of the invention, the value range of the preset value of the high pressure is 3.8MPa to 4.1 MPa. Therefore, a reasonable high-pressure preset value is set, and the reliability of protection control is guaranteed.
If the result at step S63 is satisfied, the opening and closing of the return solenoid valve 4 is forcibly controlled. Thus, the discharge pressure of the compressor 1 is determined in real time by monitoring the high-pressure side pressure and the low-pressure side pressure of the compressor 1 while performing the oil return control. And setting protection control conditions and judging whether the compressor 1 is in a reliable operation state or not. Therefore, the invention controls the opening and closing of the oil return electromagnetic valve 4 by force, and ensures the reliability of the compressor 1 preferentially at the same time of oil return control, thereby further ensuring the safe operation of the system.
In the present embodiment, step S63 includes steps S631 to S632.
In step S631, if the first protection control condition is satisfied, the return solenoid valve 4 is forcibly closed. Therefore, when the ratio of the high-pressure side pressure to the low-pressure side pressure is smaller than the preset pressure ratio, the situation that the compressor 1 cannot suck air sufficiently and exhaust air is not clean is shown, the driving force of the rotor in the cylinder is reduced, the compressor 1 is stopped frequently, the electromagnetic valve is closed forcibly at the moment, and the reliability of the compressor 1 is guaranteed preferentially.
In step S632, if the second protection control condition is satisfied, the oil return solenoid valve 4 is forcibly opened. Therefore, when the high-pressure side pressure exceeds the high-pressure preset value, the system load is overlarge, at the moment, the electromagnetic valve is forcibly opened to buffer pressure impact, unloading ensures the reliability of the system, and the reliability of the compressor 1 is preferentially ensured.
In the embodiment of the present invention, the priority of the operation of forcibly controlling the opening and closing of the oil return solenoid valve 4 is higher than the priority of the operation of controlling the opening and closing of the oil return solenoid valve 4. For example, after the compressor 1 is started for a first period of time, the compression ratio of the compressor 1 is monitored to be less than P0At this time, the solenoid valve is immediately closed, and the next oil return control is not performed. The priority of protection control is higher than that of oil return control because it is monitored that the compression ratio of the compressor 1 is less than P0If the oil return electromagnetic valve 4 is continuously opened, the oil return electromagnetic valve can be opened to a greater extentReduce the compression ratio, the harm influence of undersize compression ratio to compressor 1 is bigger, so protection control priority is greater than oil return control to this guarantees compressor 1 normal operating, avoids haring compressor 1.
Two specific experimental examples are given below to better illustrate the invention:
in an embodiment of the present invention, the first preset oil return frequency is 60HZ, the second preset oil return frequency is 40HZ, the first time duration is 3min, the second time duration is 50min, the third time duration is 3min, the pressure ratio preset value is 2.0, and the high pressure preset value range is 3.8 Mpa. When the starting of the compressor 1 is detected, the oil return electromagnetic valve 4 is immediately opened, the first frequency is 50HZ after the compressor is operated for 3min, and the first frequency is judged to be between the first preset oil return frequency and the second preset oil return frequency, so that the oil return electromagnetic valve 4 is controlled to be opened for 3min every other 50min, and then the oil return electromagnetic valve 4 is controlled to be closed after the oil return electromagnetic valve 4 is controlled to be opened for 3 min; after running for a period of time again, the ratio of the high-pressure side pressure and the low-pressure side pressure of the compressor 1 is detected to be smaller than the preset pressure ratio of 2.0, and the oil return electromagnetic valve 4 is closed forcibly at the moment. After a certain time, the solenoid valve is opened immediately after the stop of the compressor 1 is detected.
In an embodiment of the present invention, the first preset oil return frequency is 70HZ, the second preset oil return frequency is 30HZ, the first time duration is 4min, the second time duration is 60min, the third time duration is 5min, the pressure ratio preset value is 2.0, and the high pressure preset value range is 3.8 Mpa. When the starting of the compressor 1 is detected, the oil return electromagnetic valve 4 is immediately opened, the first frequency is obtained to be 80HZ after the compressor runs for 4min, and the first frequency is judged to be greater than the first preset oil return frequency, so that the oil return electromagnetic valve 4 is controlled to be closed; and after running for a period of time, detecting that the pressure of the high-pressure side of the compressor 1 is higher than the preset value of the high-pressure by 3.8Mpa, and forcibly opening the oil return electromagnetic valve 4 at the moment.
According to the method for improving the oil return reliability of the variable frequency air conditioner, the oil return electromagnetic valve 4 is controlled according to the real-time running state of the compressor 1, so that the effective and reliable oil return running of the system is ensured, the air conditioner is promoted to continuously and effectively run, and the abrasion of the compressor 1 caused by poor oil return is avoided.
Fig. 5 is a schematic structural diagram of a device 800 for improving oil return reliability of an inverter air conditioner according to an embodiment of the present invention, and the device includes an obtaining unit 801, a processing unit 802, and a control unit 803.
An obtaining unit 801, configured to obtain a first frequency of the compressor 1, where the first frequency is an operating frequency of the compressor 1 after a first duration of operation;
the processing unit 802 is configured to determine whether the first frequency meets an oil return preset condition;
and a control unit 803 configured to control opening and closing of the oil return solenoid valve 4 if an oil return preset condition is satisfied.
According to the device for improving the oil return reliability of the variable frequency air conditioner, the running state of the variable frequency air conditioner is monitored in real time through the frequency of the variable frequency compressor 1, the opening and closing of the oil return electromagnetic valve 4 are reasonably controlled according to the state of the variable frequency air conditioner compressor 1, and the oil return reliability is ensured.
In another embodiment of the present invention, an air conditioner includes a computer readable storage medium storing a computer program and a processor, where the computer program is read and executed by the processor to implement the method for improving oil return reliability of an inverter air conditioner as described above. The running state of the variable frequency compressor 1 is monitored in real time through the frequency of the variable frequency compressor, and the opening and closing of the oil return electromagnetic valve 4 are reasonably controlled according to the state of the variable frequency compressor 1, so that the reliability of oil return is ensured.
Still another embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method for improving oil return reliability of an inverter air conditioner as described above is implemented. The running state of the variable frequency compressor 1 is monitored in real time through the frequency of the variable frequency compressor, and the opening and closing of the oil return electromagnetic valve 4 are reasonably controlled according to the state of the variable frequency compressor 1, so that the reliability of oil return is ensured.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The utility model provides a method for promote inverter air conditioner oil return reliability for control promotes inverter air conditioner oil return reliability's system, its characterized in that, the system that promotes inverter air conditioner oil return reliability includes: the oil separator comprises a compressor (1), an oil separator (2), a capillary tube (3) and an oil return electromagnetic valve (4), wherein an inlet end (21) of the oil separator (2) is connected to an exhaust port (101) of the compressor (1), and a first outlet (22) of the oil separator (2) is connected to a normal operation branch through an exhaust pipeline (102); the inlet end (21) is connected to the exhaust port (101), the second outlet (23) of the oil separator (2) is connected to the capillary tube (3), the capillary tube (3) is connected to the oil return solenoid valve (4), and the oil return solenoid valve (4) is connected to the return air pipeline (103) to form an oil return branch;
the method for improving the oil return reliability of the variable frequency air conditioner comprises the following steps:
acquiring a first frequency of the compressor (1), wherein the first frequency is an operating frequency of the compressor (1) after the compressor (1) operates for a first time period;
judging whether the first frequency meets an oil return preset condition or not;
if yes, controlling the opening and closing of the oil return electromagnetic valve (4);
wherein,
the oil return preset conditions comprise second oil return preset conditions, first oil return preset conditions and third oil return preset conditions, and the second oil return preset conditions are as follows: the first frequency is between a first preset oil return frequency and a second preset oil return frequency, and the first preset oil return frequency is greater than the second preset oil return frequency; the first oil return preset condition is as follows: the first frequency is greater than or equal to a first preset oil return frequency; the third oil return preset condition is as follows: the first frequency is less than a second preset oil return frequency;
if yes, controlling the opening and closing of the oil return electromagnetic valve (4) comprises: if the second oil return preset condition is met, controlling the oil return electromagnetic valve (4) to be opened for a third time period and then closed every second time period; if the first oil return preset condition is met, controlling the oil return electromagnetic valve (4) to be closed; and if the third oil return preset condition is met, controlling the oil return electromagnetic valve (4) to be kept open.
2. The method for improving oil return reliability of the inverter air conditioner as claimed in claim 1, further comprising: and when the compressor (1) is started, the oil return electromagnetic valve (4) is controlled to be opened.
3. The method for improving oil return reliability of the inverter air conditioner as claimed in claim 1, further comprising: and when the compressor (1) is shut down, the oil return electromagnetic valve (4) is controlled to be opened.
4. The method for improving oil return reliability of inverter air conditioners as claimed in claim 1, wherein the controlling the opening and closing of the oil return solenoid valve (4) further comprises:
acquiring the high-pressure side pressure and the low-pressure side pressure of the compressor (1);
judging whether the high-pressure side pressure and/or the low-pressure side pressure meet a protection control condition;
if the pressure difference meets the preset value, the opening and closing of the oil return electromagnetic valve (4) are forcibly controlled.
5. The method for improving the oil return reliability of the inverter air conditioner as claimed in claim 4, wherein the protection control conditions include a first protection control condition, and the first protection control condition is: the ratio of the high-pressure side pressure to the low-pressure side pressure is smaller than a preset pressure ratio value; if yes, the step of forcibly controlling the opening and closing of the oil return electromagnetic valve (4) comprises the following steps: and if the first protection control condition is met, forcibly closing the oil return electromagnetic valve (4).
6. The method for improving oil return reliability of the inverter air conditioner as claimed in claim 4, wherein the protection control condition comprises a second protection control condition, and the second protection control condition is: the high side pressure exceeds a high pressure preset value; if yes, the step of forcibly controlling the opening and closing of the oil return electromagnetic valve (4) comprises the following steps: and if the second protection control condition is met, forcibly opening the oil return electromagnetic valve (4).
7. The method for improving the oil return reliability of the inverter air conditioner as claimed in any one of claims 1 to 6, wherein the oil separator (2) comprises a multi-layer filter screen structure.
8. The utility model provides a promote device of inverter air conditioner oil return reliability which characterized in that includes:
the device comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit is used for acquiring a first frequency of a compressor (1), and the first frequency is an operation frequency of the compressor (1) after a first time period;
the processing unit is used for judging whether the first frequency meets an oil return preset condition or not;
the control unit is used for controlling the opening and closing of the oil return electromagnetic valve (4) if the oil return preset condition is met;
wherein,
the oil return preset conditions comprise second oil return preset conditions, first oil return preset conditions and third oil return preset conditions, and the second oil return preset conditions are as follows: the first frequency is between a first preset oil return frequency and a second preset oil return frequency, and the first preset oil return frequency is greater than the second preset oil return frequency; the first oil return preset condition is as follows: the first frequency is greater than or equal to a first preset oil return frequency; the third oil return preset condition is as follows: the first frequency is less than a second preset oil return frequency;
if yes, controlling the opening and closing of the oil return electromagnetic valve (4) comprises: if the second oil return preset condition is met, controlling the oil return electromagnetic valve (4) to be opened for a third time period and then closed every second time period; if the first oil return preset condition is met, controlling the oil return electromagnetic valve (4) to be closed; and if the third oil return preset condition is met, controlling the oil return electromagnetic valve (4) to be kept open.
9. An air conditioner, characterized by comprising a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed by the processor, so as to implement the method for improving oil return reliability of an inverter air conditioner according to any one of claims 1 to 7.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the computer program implements the method for improving oil return reliability of an inverter air conditioner according to any one of claims 1 to 7.
CN202010283497.8A 2020-04-13 2020-04-13 System, method and device for improving oil return reliability of variable frequency air conditioner Active CN111426102B (en)

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