CN105371531B - The low frequency method for controlling oil return and system of air conditioner - Google Patents

The low frequency method for controlling oil return and system of air conditioner Download PDF

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Publication number
CN105371531B
CN105371531B CN201510867355.5A CN201510867355A CN105371531B CN 105371531 B CN105371531 B CN 105371531B CN 201510867355 A CN201510867355 A CN 201510867355A CN 105371531 B CN105371531 B CN 105371531B
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CN
China
Prior art keywords
air conditioner
oil return
fan
rotating speed
expansion valve
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Expired - Fee Related
Application number
CN201510867355.5A
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Chinese (zh)
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CN105371531A (en
Inventor
李远航
林康桂
肖彪
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201510867355.5A priority Critical patent/CN105371531B/en
Publication of CN105371531A publication Critical patent/CN105371531A/en
Application granted granted Critical
Publication of CN105371531B publication Critical patent/CN105371531B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00Compressor arrangements
    • F25B31/002Lubrication
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00Problems to be solved
    • F25B2500/06Damage
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00Problems to be solved
    • F25B2500/16Lubrication
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17Speeds
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2104Temperatures of an indoor room or compartment
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The present invention provides a kind of the low frequency method for controlling oil return and system of air conditioner.Wherein method includes:Detect running frequency, suction superheat, indoor environment temperature and the outdoor environment temperature of compressor;When the running frequency for detecting compressor is running preset time in the case of less than default oil return frequency, air conditioner enters oil return pattern, according to the initial speed of the initial opening of electric expansion valve, the initial speed of outdoor fan and indoor fan in indoor environment temperature and outdoor environment temperature selection air conditioner, and the aperture for adjusting electric expansion valve is initial opening, the rotating speed for adjusting outdoor fan is initial speed, and the rotating speed for adjusting indoor fan is initial speed;According to aperture, the rotating speed of outdoor fan and the rotating speed of indoor fan of the suction superheat regulation electric expansion valve detected.It reaches the effect of oil return using pipeline pressure difference, in the case where not influenceing the refrigeration capacity requirement of low-frequency operation and operational reliability, overcomes the various unfavorable factors that traditional raising frequency spill strip comes.

Description

The low frequency method for controlling oil return and system of air conditioner
Technical field
The present invention relates to air-conditioner field, more particularly to the low frequency method for controlling oil return and system of a kind of air conditioner.
Background technology
Traditional air conditioner, when compressor long-play is in relatively low frequency, the refrigerant in system is because of system pressure Power is low and makes the flow velocity step-down of refrigerant, causes the lubricating oil taken out of by refrigerant normally can not take back compressor by refrigerant, If lubricating oil is carried over and can not return compressor normal through the tape loop of refrigerant for a long time, it is easy to cause compressor Abrasion or burn.
In order to solve this problem, the method taken at present is that rear raising frequency carries out oil return to compressor low-frequency operation for a period of time Control so that the lubricating oil being trapped in outside compressor take back or compressor cavity on the grease pump of compression motor spindle oil sump with Have the function that lubrication.But air conditioner raising frequency oil return under low-frequency operation can break the stable state of environment, cause in room Temperature change, influences user's usage comfort, and room temperature change easily causes temperature spot when reaching temperature spot stop condition The phenomenon of shutdown, cause frequently startup-shutdown, and frequently startup-shutdown to have little time to form stable high speed gas in muffler Stream, lubricating oil can not take back compressor by refrigerant in time, be unfavorable for oil return, and the frequently raising frequency oil return of air conditioner also results in Unnecessary electricity wastes, and reduces the utilization ratio and performance of air conditioner.
The content of the invention
In consideration of it, providing the low frequency method for controlling oil return and system of a kind of air conditioner, air conditioner is enabled to not rise rate In the case of can also be normally carried out oil return.
To reach goal of the invention, there is provided a kind of low frequency method for controlling oil return of air conditioner, methods described include:
Detect the indoor environment temperature of the running frequency of compressor, suction superheat and the air conditioner in air conditioner And outdoor environment temperature;
When the running frequency for detecting the compressor is running preset time in the case of less than default oil return frequency, The air conditioner enters oil return pattern, is selected according to the indoor environment temperature and the outdoor environment temperature in the air conditioner The initial speed of the initial opening of electric expansion valve, the initial speed of outdoor fan and indoor fan, and adjust electric expansion valve Aperture be the electric expansion valve initial opening, adjust outdoor fan rotating speed be the outdoor fan initial speed, The rotating speed for adjusting indoor fan is the initial speed of the indoor fan;
According to the aperture of the suction superheat regulation electric expansion valve detected, the rotating speed of the outdoor fan With the rotating speed of the indoor fan.
In one of the embodiments, the air conditioner enters oil return pattern, according to the indoor environment temperature and described The initial opening of electric expansion valve in outdoor environment temperature selection air conditioner, the initial speed of outdoor fan and indoor fan just Beginning rotating speed, and the aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, the rotating speed for adjusting outdoor fan is The initial speed of the outdoor fan, adjust indoor fan rotating speed be the indoor fan initial speed the step of include:
The default aperture model of the electric expansion valve is determined according to the indoor environment temperature and the outdoor environment temperature Enclose, the preset rotation speed scope of the outdoor fan and the preset rotation speed scope of the indoor fan;
The initial opening of the electric expansion valve is selected in the default open range of the electric expansion valve, in the room The initial speed of the outdoor fan is selected in the range of the preset rotation speed of outer blower fan, in the preset rotation speed scope of the indoor fan The initial speed of the interior selection indoor fan;
The aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is institute The initial speed of outdoor fan is stated, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan.
In one of the embodiments, the suction superheat that the basis detects adjusts the electric expansion valve The step of rotating speed of aperture, the rotating speed of the outdoor fan and the indoor fan, includes:
When detecting that the suction superheat reaches the first preset limit value, the rotating speed of the indoor fan is controlled to stop Only, and the outdoor fan is controlled to be run by existing rotating speed;
When detecting that the suction superheat reaches the second preset limit value, the rotating speed of the outdoor fan is controlled to stop Only, and the indoor fan is controlled to be run by existing rotating speed.
In one of the embodiments, if the air conditioner is run in cooling mode, after the oil return pattern is entered, Shield the anti-freeze function of the air conditioner and reach the function of being shut down during default cryogenic temperature;
If the air conditioner operation is in a heating mode, after the oil return pattern is entered, the change of the air conditioner is shielded White function and the function of being shut down when reaching default heating temperature.
In one of the embodiments, the suction superheat detected in the basis adjusts the electric expansion valve Aperture, the outdoor fan rotating speed and the indoor fan rotating speed the step of after include:
Detecting that the suction superheat reaches default disengaging value or the air conditioner under the oil return pattern and run After special time, oil return pattern is exited, completes oil return;
If the air conditioner operation is in cooling mode, after oil return is completed, recover the anti-freeze function of the air conditioner With the function of being shut down when reaching default cryogenic temperature;
If air conditioner operation is in a heating mode, after oil return is completed, recover the defrosting function of the air conditioner with Reach the function of being shut down during default heating temperature.
The present invention also provides a kind of low frequency oil return control system of air conditioner, and the system includes:
Detection module, for detecting the running frequency of compressor in air conditioner, suction superheat and the air conditioner Indoor environment temperature and outdoor environment temperature;
Oil return module, for being transported when the running frequency for detecting the compressor in the case of less than default oil return frequency During row preset time, the air conditioner enters oil return pattern, is selected according to the indoor environment temperature and the outdoor environment temperature The initial speed of the initial opening of electric expansion valve, the initial speed of outdoor fan and indoor fan in the air conditioner is selected, and The aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is the outdoor wind The initial speed of machine, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan;
Adjustment module, for adjusting the aperture, described of the electric expansion valve according to the suction superheat that detects The rotating speed of the rotating speed of outdoor fan and the indoor fan.
In one of the embodiments, the oil return module includes:
Determining unit, for determining the electric expansion valve according to the indoor environment temperature and the outdoor environment temperature Default open range, the preset rotation speed scope of the outdoor fan and the preset rotation speed scope of the indoor fan;
Selecting unit, the initial of the electric expansion valve is selected to open in the default open range of the electric expansion valve Degree, the initial speed of the outdoor fan is selected in the range of the preset rotation speed of the outdoor fan, in the indoor fan The initial speed of the indoor fan is selected in the range of preset rotation speed;
Adjustment unit, the aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, outside regulation room The rotating speed of blower fan is the initial speed of the outdoor fan, and the rotating speed for adjusting indoor fan turns for the initial of the indoor fan Speed.
In one of the embodiments, the adjustment module includes:
First control unit, for when detecting that the suction superheat reaches the first preset limit value, described in control The rotating speed of indoor fan stops, and controls the outdoor fan to be run by existing rotating speed;
Second control unit, for when detecting that the suction superheat reaches the second preset limit value, described in control The rotating speed of outdoor fan stops, and controls the indoor fan to be run by existing rotating speed.
In one of the embodiments, in addition to:
First shroud module, if for air conditioner operation in cooling mode, after the oil return pattern is entered, screen State the anti-freeze function of air conditioner and reach the function of being shut down during default cryogenic temperature in covert;
Secondary shielding module, if for air conditioner operation in a heating mode, after the oil return pattern is entered, screen State the defrosting function of air conditioner and reach the function of being shut down during default heating temperature in covert.
In one of the embodiments, in addition to:
Module is exited in oil return, for detecting that the suction superheat reaches default disengaging value or the air conditioner in institute State after running special time under oil return pattern, exit oil return pattern, complete oil return;
First recovery module, if for air conditioner operation in cooling mode, after oil return is completed, recovering the sky Adjust the anti-freeze function of device and reach the function of being shut down during default cryogenic temperature;
Second recovery module, if for air conditioner operation in a heating mode, after oil return is completed, recovering the sky Adjust the defrosting function of device and reach the function of being shut down during default heating temperature.
Beneficial effects of the present invention include:
The low frequency method for controlling oil return and system of above-mentioned air conditioner, there is no raising frequency in compressor and not influence air conditioner reliable In the case of operation, the effect of oil return is reached using pipeline pressure difference, what is overcome due to frequent raising frequency oil return and occur frequently opens The technical problem of shutdown, the situation of compressor oil starvation caused by avoiding frequent startup-shutdown, and will not be into temperature change in room The uncomfortable situation of caused use, meanwhile, because compressor does not have raising frequency oil return, caused by compressor raising frequency is not present Unnecessary electricity wastes, and greatly reduces power consumption, improves air-conditioning utilization ratio.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the low frequency method for controlling oil return of the air conditioner in one embodiment;
Fig. 2 is the structural representation of the low frequency oil return control system of the air conditioner in one embodiment.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples pair The low frequency method for controlling oil return and system of air conditioner of the present invention are further elaborated.It is it should be appreciated that described herein Specific embodiment only to explain the present invention, is not intended to limit the present invention.
In one embodiment, as shown in Figure 1, there is provided a kind of low frequency method for controlling oil return of air conditioner, this method bag Include:
S100, detect the indoor environment of the running frequency of compressor, suction superheat and the air conditioner in air conditioner Temperature and outdoor environment temperature.
S200, when the running frequency for detecting compressor runs preset time in the case of less than default oil return frequency When, air conditioner enters oil return pattern, according to electric expansion valve in indoor environment temperature and outdoor environment temperature selection air conditioner Initial opening KInitiallyB, the initial speed V of outdoor fanIt is initial outerWith the initial speed V of indoor fanIn initial, and adjust electric expansion valve Aperture be electric expansion valve initial opening KInitiallyB, the rotating speed for adjusting outdoor fan is the initial speed V of outdoor fanIt is initial outer, The rotating speed for adjusting indoor fan is the initial speed V of indoor fanIn initial
S300, the aperture of electric expansion valve, the rotating speed of outdoor fan and interior are adjusted according to the suction superheat detected The rotating speed of blower fan.
In the present embodiment, when compressor is less than default oil return frequency FOil returnPreset time T is run under (such as 20Hz)1(such as When 1h), air conditioner enters oil return pattern, if not entering oil return pattern, air conditioner be possible to can because lack lubricating oil and by Abrasion is even burnt out.But used in the present embodiment be not it is traditional oil return is haveed the function that by compressor raising frequency, but The initial opening K of suitable electric expansion valve is selected by the outdoor environment temperature and indoor environment temperature of detectionInitiallyB, it is outdoor The initial speed V of blower fanIt is initial outerWith the initial speed V of indoor fanIn initial, to ensure to have in air conditioner certain pipeline pressure difference (pressure The pressure differential of contracting machine exhaust end and suction end), have the function that oil return using pipeline pressure difference.Indoor environment temperature and outdoor environment Temperature has a certain impact to the system pressure of air conditioner, so in the initial opening K of selection electric expansion valveInitiallyB, outdoor wind The initial speed V of machineIt is initial outerWith the initial speed V of indoor fanIn initialWhen taken into full account ambient temperature.For example, air conditioner When operating in refrigeration mode, if outdoor environment temperature is relatively low, condenser is more easy to be exchanged heat with outdoor environment, therefore condenser The system pressure of side is small when environment temperature is high than outdoor;If indoor environment temperature is higher, evaporator is more easy to and outdoor environment Exchanged heat, the system pressure of vaporizer side is larger when low compared with indoor environment temperature.Such as:If air conditioner operates in refrigeration mode Under, in order that air conditioner just has certain pipeline pressure difference when starting oil return, select less outdoor fan initial speed (cold The external heat exchange of condenser is small) and less indoor fan initial speed (the external heat exchange of evaporator is small), simultaneous selection is larger Electric expansion valve initial opening, and make the aperture of the electric expansion valve of air conditioner for the initial opening K of above-mentioned electric expansion valveInitially B, outdoor fan rotating speed are the initial speed V of above-mentioned outdoor fanIt is initial outer, indoor fan rotating speed is that the initial of above-mentioned indoor fan turns Fast VIn initialSo that air-conditioning system just has certain pipeline pressure difference when entering oil return pattern, and pipeline pressure difference causes refrigerant to have Certain flow velocity, lubricating oil can be driven to return to compressor.
In the oil return running of reality, the suction superheat of compressor is changing all the time, is adjusted according to suction superheat Save aperture, the rotating speed of outdoor fan and the rotating speed of indoor fan of electric expansion valve.When air conditioner operates in refrigeration mode, if Suction superheat becomes big, then adjusts electric expansion valve and become big, and indoor fan rotating speed reduces, so that the drop of suction superheat appropriateness It is low, avoid shutting down because of compressor coil temperature protection switch action caused by suction superheat is excessive, it is now, empty to ensure The pipeline pressure difference in device is adjusted to have the function that oil return, the rotating speed of outdoor fan keeps constant;If suction superheat diminishes, adjust Electric expansion valve diminishes, the increase of indoor fan rotating speed so that suction superheat moderately raises, avoid because suction superheat is too small and Cause compressor hydraulic compression and damage rotor, now, to ensure that the pipeline pressure difference in air conditioner has the function that oil return, outdoor wind The rotating speed of machine keeps constant or diminished.When air conditioner operates in heating mode, if suction superheat becomes big, electronic expansion is adjusted Valve becomes big, and outdoor fan rotating speed diminishes, so that the reduction of suction superheat appropriateness, is avoided caused by because suction superheat is excessive Compressor coil temperature protection switch is acted and shut down, now, to ensure that the pipeline pressure difference in air conditioner has the function that oil return, The rotating speed of outdoor fan keeps constant;If suction superheat diminishes, adjustment electric expansion valve diminishes, and outdoor fan rotating speed increases Greatly, so that suction superheat moderately raises, avoid causing compressor hydraulic compression because suction superheat is too small and damaging rotor, this When, to ensure that the pipeline pressure difference in air conditioner has the function that oil return, the rotating speed of indoor fan keeps constant or diminished.
The low frequency method for controlling oil return of air conditioner in the present embodiment, in the compressor not in the case of raising frequency of air conditioner, Refrigerant liquid is changed by the rotating speed of the aperture for the electric expansion valve for adjusting air conditioner, the rotating speed of outdoor fan and indoor fan State ratio, the pressure of liquid refrigerant in air conditioner is improved, and then change the pressure differential of exhaust outlet of compressor and air entry, so as to Make refrigerant that there is certain flow velocity, the lubricating oil outside air-conditioning system inner compressor, which is taken back compressor, to be lubricated, and is pressed The pressure differential of contracting machine exhaust outlet and air entry can moisten compressor cavity on the grease pump in compression motor spindle oil sump It is sliding.
In the embodiment, air conditioner carries out oil return, the cold need in the case where meeting air conditioner low-frequency operation using pipeline pressure difference Ask, while not influenceing air conditioner reliability of operation, overcome the frequent startup-shutdown that occurs due to frequent raising frequency oil return Technical problem, the situation of compressor oil starvation caused by avoiding frequent startup-shutdown, and due to not frequent startup-shutdown, therefore will not Cause to use uncomfortable situation in room caused by temperature change, meanwhile, because compressor does not have raising frequency oil return, do not deposit Unnecessary electricity wastes caused by compressor raising frequency, greatly reduces power consumption, improves air-conditioning utilization ratio.
Specifically, in one embodiment, step S200 includes:
The default open range of electric expansion valve is determined according to indoor environment temperature and outdoor environment temperature, outdoor fan The preset rotation speed scope of preset rotation speed scope and the indoor fan.
The initial opening K of the electric expansion valve is selected in the default open range of electric expansion valveInitiallyB, in outdoor wind The initial speed V of outdoor fan is selected in the range of the preset rotation speed of machineIt is initial outer, select room in the range of the preset rotation speed of blower fan indoors The initial speed V of inner blowerIn initial
The aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is institute The initial speed of outdoor fan is stated, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan.
Before oil return control, interval combinations are carried out to outdoor environment temperature and indoor environment temperature in advance, such as with temperature It is that an index is that outdoor environment temperature and indoor environment temperature are divided that excursion, which is 5 °, outdoor environment temperature 35~ In the range of 40 °, if the now floating of indoor environment temperature is set to first interval at 35~40 °, if now indoor environment is floating Move and be then set to second interval at 30~35 ° ... ... between Section Eight is set to if indoor environment temperature is 0~5 °, in outdoor environment Temperature is 30~35 °, and indoor environment temperature is 35~40 ° and is then set to the 9th space ... ..., outdoor environment temperature For 0~5 °, indoor environment temperature is 35~40 ° and is set to X space, and each space is rule of thumb or experiment is preset with accordingly Electronic expansion valve opening scope, the outdoor fan range of speeds and the indoor fan range of speeds, the electric expansion valve of air conditioner, room Outer blower fan and indoor fan are operated in corresponding preset range, can ensure corresponding pipeline pressure difference, reach the effect of oil return. In the initial speed V of selection outdoor fanIt is initial outer, indoor fan initial speed VIn initialWith electric expansion valve initial opening KInitiallyb When, corresponding aperture and rotating speed, Ji Nengman are selected in corresponding preset range according to outdoor environment temperature and indoor environment temperature The demand of sufficient air-conditioner hose pressure difference, operation is relatively easy again, saves the time of selection.
It is determined that the default open range of electric expansion valve, the preset rotation speed scope of outdoor fan and presetting for indoor fan After the range of speeds, the initial opening K of an electric expansion valve is selected in the default open range of electric expansion valveInitiallyB, and The aperture for adjusting electric expansion valve is the initial opening K of above-mentioned electric expansion valveInitiallyB, in the range of the preset rotation speed of outdoor fan Select the initial speed V of an outdoor fanIt is initial outer, and the rotating speed for adjusting outdoor fan is the initial speed of above-mentioned outdoor fan VIt is initial outer, indoors in the range of the preset rotation speed of blower fan select an indoor fan initial speed VIn initial, and adjust indoor fan Rotating speed be above-mentioned indoor fan initial speed VIn initial, so that it is guaranteed that just having necessarily when air conditioner has just enter into oil return pattern Pipeline pressure difference, realize the effect of oil return.
In a real-time example, step S200 includes:
Detecting that suction superheat reaches the first preset limit value TThe limit 1When, control the rotating speed of indoor fan to stop, and Outdoor fan is controlled to be run by existing rotating speed;
Detecting that suction superheat reaches the second preset limit value TThe limit 2When, control the rotating speed of outdoor fan to stop, and Indoor fan is controlled to be run by existing rotating speed.
The present embodiment is more specific embodiment, and simply one kind in embodiment preferably selects, however it is not limited to this.Its In the first preset limit value TThe limit 1Including the first refrigeration preset limit value TRefrigerating limit 1With the first heating preset limit value THeat the limit 1.The One refrigeration preset limit value TRefrigerating limit 1One that the suction superheat of compressor under refrigeration mode reaches is operated in for air conditioner to face Boundary's point (suction superheat crosses the point that conference causes compressor coil temperature protection switch to act and shut down), the default pole of the first heating Limit value THeat the limit 1Critical point (the suction superheat that the suction superheat of compressor under heating mode reaches is operated in for air conditioner Spend the small point for causing compressor hydraulic compression).Air conditioner operation in cooling mode when, when detecting that suction superheat reaches the One refrigeration preset limit value TRefrigerating limit 1When, control the rotating speed of indoor fan to stop, with the refrigerant slowed down in evaporator of maximum With the heat transfer rate of external environment condition, so as to reduce suction superheat, while keep the rotating speed of outdoor fan constant, keep air conditioner With the heat exchange of outdoor environment, it can so ensure the system pressure in air conditioner, refrigerant drives lubricating oil in liquid form Return to compressor.Air conditioner operation in cooling mode when, when detecting that suction superheat reaches the first heating preset limit value THeat the limit 1When, control the rotating speed of indoor fan to stop, being handed over the heat of the refrigerant slowed down in condenser of maximum and external environment condition Throw-over degree, while keep the rotating speed of outdoor fan constant, ensureing to reach oil return effect to ensure the system pressure in air conditioner While fruit, the refrigerant and outdoor environment that make vaporizer side keep heat transfer rate, to ensure that suction superheat is unlikely to too low.
Second preset limit value TThe limit 2Including the second refrigeration preset limit value TRefrigerating limit 2With the second heating preset limit value THeat the limit 2.Second refrigeration preset limit value TRefrigerating limit 2The suction superheat that compressor under refrigeration mode is operated in for air conditioner reaches A critical point (the too small point for causing compressor hydraulic compression of suction superheat), the second heating preset limit value THeat the limit 2For sky (suction superheat crosses conference and causes to press for the critical point that the suction superheat that tune device operates in compressor under heating mode reaches The point that contracting machine coil temperature protection switch is acted and shut down).Air conditioner operation in cooling mode when, when detecting suction superheat Degree reaches the second refrigeration preset limit value TRefrigerating limit 2When, control the rotating speed of outdoor fan to stop, with slowing down in condenser for maximum The heat transfer rate of refrigerant and external environment condition, while keep the rotating speed of indoor fan constant, ensure the heat exchange of air conditioner indoor environment On the basis of, moreover it is possible to suction superheat is unlikely to too low, while also assures that the pipeline pressure difference in air conditioner, refrigeration can be made Agent drives lubricating oil to return to compressor in liquid form.Air conditioner operation in cooling mode when, when detecting suction superheat Degree reaches the second heating preset limit value THeat the limit 2When, control the rotating speed of outdoor fan to stop, with slowing down in evaporator for maximum The heat transfer rate of refrigerant and external environment condition, so that suction superheat is unlikely to too high, while keep the rotating speed of indoor fan not Become, to ensure the normal heat exchange of air conditioner and indoor environment, and also ensure the pipeline pressure difference in air conditioner simultaneously, refrigeration can be made Agent drives lubricating oil to return to compressor in liquid form.
In one embodiment, if air conditioner operation in cooling mode, after oil return pattern is entered, shields air conditioner Anti-freeze function and reach the function of being shut down during default cryogenic temperature.
If air conditioner is run in a heating mode, after oil return pattern is entered, shield the defrosting function of air conditioner and reach The function of being shut down during default heating temperature.
The operational mode of air conditioner includes refrigeration mode and heating mode, shields anti-freeze function in cooling mode and reaches The function of being shut down during to default cryogenic temperature, when avoiding the air conditioner from operating under oil return pattern, anti-freeze pattern is converted to suddenly Or shutdown mode influences the process of air conditioner oil returning, air conditioner is avoided because can not compressor abrasion or burning caused by oil return in time Ruin.Defrosting function is shielded under heating mode and reaches the function of being shut down during default heating temperature, avoids air conditioner from operating in oil return When under pattern, being converted to defrost pattern or shutdown mode suddenly influences the oil return process of air conditioner, avoid air conditioner because can not and When compressor abrasion caused by oil return or burn.
In one embodiment, include after step S300:
Detecting that suction superheat reaches after default disengaging value or air conditioner run special time under oil return pattern, moving back Go out oil return pattern, complete oil return.
If air conditioner is run in cooling mode, after oil return is completed, recover the anti-freeze function of air conditioner and reach pre- If the function of being shut down during cryogenic temperature.
If air conditioner is run in a heating mode, after oil return is completed, recover the defrosting function of air conditioner and reach default Heat the function of being shut down during temperature.
Detecting that suction superheat reaches default disengaging value TExitOr air conditioner runs special time T under oil return pattern2 After (such as 3min), oil return pattern is exited, the now oil return action of air conditioner is completed.After air conditioner completes oil return action, recover empty The corresponding function that operates under corresponding modes of device is adjusted, to ensure that air conditioner being capable of normal work, it is ensured that the safety of whole system.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM) etc..
In one embodiment, as shown in Fig. 2 additionally providing a kind of low frequency oil return control system of air conditioner, the system Including:Detection module 100, for detecting the running frequency of compressor in air conditioner, suction superheat and the air conditioner Indoor environment temperature and outdoor environment temperature.Oil return module 200, detect the running frequency of compressor less than default for working as When preset time is run in the case of oil return frequency, air conditioner enters oil return pattern, according to indoor environment temperature and the outdoor The initial opening K of electric expansion valve in environment temperature selection air conditionerInitiallyB, the initial speed V of outdoor fanIt is initial outerAnd indoor fan Initial speed VIn initial, and the aperture for adjusting electric expansion valve is the initial opening of electric expansion valve, adjusts turning for outdoor fan Speed is the initial speed of outdoor fan, and the rotating speed for adjusting indoor fan is the initial speed of indoor fan.Adjustment module 300, use In turn that the aperture of the electric expansion valve, the rotating speed of outdoor fan and indoor fan are adjusted according to the suction superheat detected Speed.
In the present embodiment, the compressor of air conditioner carries out oil return using pipeline pressure difference, in the case where meeting air conditioner low-frequency operation Refrigeration requirement, while not influenceing air conditioner reliability of operation, overcome due to frequent raising frequency oil return and occur frequent The technical problem of startup-shutdown, the situation of compressor oil starvation caused by avoiding frequent startup-shutdown, and due to not frequent startup-shutdown, Therefore will not cause to use uncomfortable situation in room caused by temperature change, meanwhile, because compressor does not have raising frequency oil return, So being wasted in the absence of unnecessary electricity caused by compressor raising frequency, power consumption is greatly reduced, improves air-conditioning utilization ratio.
In one embodiment, oil return module 200 includes:Determining unit 210, for according to the indoor environment temperature and The outdoor environment temperature determines the default open range of electric expansion valve, the preset rotation speed scope and indoor fan of outdoor fan Preset rotation speed scope.Selecting unit 220, the initial of electric expansion valve is selected to open in the default open range of electric expansion valve Spend KInitiallyB, the initial speed V of outdoor fan is selected in the range of the preset rotation speed of outdoor fanIt is initial outer, blower fan is default indoors The initial speed V of selection indoor fan in the range of speedsIn initial.Adjustment unit 230, for adjusting the aperture of electric expansion valve as electricity The initial opening of sub- expansion valve, the rotating speed for adjusting outdoor fan is the initial speed of outdoor fan, adjusts the rotating speed of indoor fan For the initial speed of indoor fan.
In one embodiment, adjustment module 300 includes:First control unit 310, for detecting the air-breathing mistake Temperature reaches the first preset limit value TThe limit 1When, control the rotating speed of indoor fan to stop, and control outdoor fan by existing turn Speed operation.Second control unit 320, for detecting that suction superheat reaches the second preset limit value TThe limit 2When, control room The rotating speed of outer blower fan stops, and controls indoor fan to be run by existing rotating speed.
In one embodiment, in addition to:First shroud module 201, if for air conditioner operation in cooling mode, Into after the oil return pattern, shield the anti-freeze function of air conditioner and reach the function of being shut down during default cryogenic temperature.Second Shroud module 202, if for air conditioner operation in a heating mode, after the oil return pattern is entered, shielding the change of air conditioner White function and the function of being shut down when reaching default heating temperature.
In one embodiment, in addition to:Module 400 is exited in oil return, for detecting that suction superheat reaches default After disengaging value or air conditioner run special time under the oil return pattern, oil return pattern is exited, completes oil return.First recovers mould Block 401, if for air conditioner operation in cooling mode, after oil return is completed, recovering the anti-freeze function of air conditioner and reaching The function of being shut down during default cryogenic temperature.Second recovery module 402, if for air conditioner operation in a heating mode, completing After oil return, recover the defrosting function of air conditioner and reach the function of being shut down during default heating temperature.
It is similar to a kind of low frequency method for controlling oil return of foregoing air conditioner to solve the principle of problem due to this system, therefore should The implementation of system may refer to the implementation of preceding method, repeats part and repeats no more.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (10)

1. the low frequency method for controlling oil return of a kind of air conditioner, it is characterised in that methods described includes:
Detect the running frequency of compressor, the indoor environment temperature of suction superheat and the air conditioner and room in air conditioner External environment temperature;
It is described when the running frequency for detecting the compressor is running preset time in the case of less than default oil return frequency Air conditioner enters oil return pattern, and electronics in the air conditioner is selected according to the indoor environment temperature and the outdoor environment temperature The initial speed of the initial opening of expansion valve, the initial speed of outdoor fan and indoor fan, and adjust opening for electric expansion valve Spend for the initial opening of the electric expansion valve, the rotating speed for adjusting outdoor fan is the initial speed of the outdoor fan, is adjusted The rotating speed of indoor fan is the initial speed of the indoor fan;
The aperture of the electric expansion valve, the rotating speed of the outdoor fan and institute are adjusted according to the suction superheat detected State the rotating speed of indoor fan.
2. the low frequency method for controlling oil return of air conditioner according to claim 1, it is characterised in that the air conditioner enters back Oily pattern, opened according to the initial of electric expansion valve in the indoor environment temperature and outdoor environment temperature selection air conditioner Degree, the initial speed of outdoor fan and the initial speed of indoor fan, and the aperture for adjusting electric expansion valve is swollen for the electronics The initial opening of swollen valve, the rotating speed for adjusting outdoor fan is the initial speed of the outdoor fan, adjusts the rotating speed of indoor fan For the indoor fan initial speed the step of include:
The default open range of the electric expansion valve, institute are determined according to the indoor environment temperature and the outdoor environment temperature State the preset rotation speed scope of outdoor fan and the preset rotation speed scope of the indoor fan;
The initial opening of the electric expansion valve is selected in the default open range of the electric expansion valve, in the outdoor wind The initial speed of the outdoor fan is selected in the range of the preset rotation speed of machine, is selected in the range of the preset rotation speed of the indoor fan Select the initial speed of the indoor fan;
The aperture for adjusting electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is the room The initial speed of outer blower fan, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan.
3. the low frequency method for controlling oil return of air conditioner according to claim 1, it is characterised in that what the basis detected The suction superheat adjusts aperture, the rotating speed of the outdoor fan and the rotating speed of the indoor fan of the electric expansion valve The step of include:
When detecting that the suction superheat reaches the first preset limit value, the rotating speed of the indoor fan is controlled to stop, and The outdoor fan is controlled to be run by existing rotating speed;
When detecting that the suction superheat reaches the second preset limit value, the rotating speed of the outdoor fan is controlled to stop, and The indoor fan is controlled to be run by existing rotating speed.
4. the low frequency method for controlling oil return of the air conditioner according to any one of claims 1 to 3, it is characterised in that if described Air conditioner is run in cooling mode, after the oil return pattern is entered, is shielded the anti-freeze function of the air conditioner and is reached The function of being shut down during default cryogenic temperature;
If the air conditioner operation is in a heating mode, after the oil return pattern is entered, the defrost work(of the air conditioner is shielded The function of being shut down during default heating temperature and can be reached.
5. the low frequency method for controlling oil return of air conditioner according to claim 4, it is characterised in that detected in the basis The suction superheat adjust turning for the aperture of the electric expansion valve, the rotating speed of the outdoor fan and the indoor fan Include after the step of speed:
Detect the suction superheat reach default disengaging value or the air conditioner run under the oil return pattern it is specific After time, oil return pattern is exited, completes oil return;
If the air conditioner operation is in cooling mode, after oil return is completed, recovers the anti-freeze function of the air conditioner and reach The function of being shut down during to default cryogenic temperature;
If the air conditioner operation is in a heating mode, after oil return is completed, recovers the defrosting function of the air conditioner and reach The function of being shut down during default heating temperature.
6. the low frequency oil return control system of a kind of air conditioner, it is characterised in that the system includes:
Detection module, for detecting the interior of the running frequency of compressor, suction superheat and the air conditioner in air conditioner Environment temperature and outdoor environment temperature;
Oil return module, for being run when the running frequency for detecting the compressor in the case of less than default oil return frequency in advance If during the time, the air conditioner enters oil return pattern, institute is selected according to the indoor environment temperature and the outdoor environment temperature The initial speed of the initial opening of electric expansion valve, the initial speed of outdoor fan and indoor fan in air conditioner is stated, and is adjusted The aperture of electric expansion valve is the initial opening of the electric expansion valve, and the rotating speed for adjusting outdoor fan is the outdoor fan Initial speed, the rotating speed for adjusting indoor fan is the initial speed of the indoor fan;
Adjustment module, for the aperture that the electric expansion valve is adjusted according to the suction superheat detected, the outdoor The rotating speed of the rotating speed of blower fan and the indoor fan.
7. the low frequency oil return control system of air conditioner according to claim 6, it is characterised in that the oil return module bag Include:
Determining unit, for determining the pre- of the electric expansion valve according to the indoor environment temperature and the outdoor environment temperature If open range, the preset rotation speed scope of the outdoor fan and the preset rotation speed scope of the indoor fan;
Selecting unit, the initial opening of the electric expansion valve is selected in the default open range of the electric expansion valve, The initial speed of the outdoor fan is selected in the range of the preset rotation speed of the outdoor fan, default in the indoor fan turns The initial speed of the selection indoor fan in fast scope;
Adjustment unit, the aperture for adjusting electric expansion valve are the initial opening of the electric expansion valve, adjust outdoor fan Rotating speed be the outdoor fan initial speed, adjust indoor fan rotating speed be the indoor fan initial speed.
8. the low frequency oil return control system of air conditioner according to claim 6, it is characterised in that the adjustment module bag Include:
First control unit, for when detecting that the suction superheat reaches the first preset limit value, controlling the interior The rotating speed of blower fan stops, and controls the outdoor fan to be run by existing rotating speed;
Second control unit, for when detecting that the suction superheat reaches the second preset limit value, controlling the outdoor The rotating speed of blower fan stops, and controls the indoor fan to be run by existing rotating speed.
9. the low frequency oil return control system of the air conditioner according to any one of claim 6 to 8, it is characterised in that also include:
First shroud module, if for air conditioner operation in cooling mode, after the oil return pattern is entered, shielding institute State the anti-freeze function of air conditioner and reach the function of being shut down during default cryogenic temperature;
Secondary shielding module, if for air conditioner operation in a heating mode, after the oil return pattern is entered, shielding institute State the defrosting function of air conditioner and reach the function of being shut down during default heating temperature.
10. the low frequency oil return control system of air conditioner according to claim 9, it is characterised in that also include:
Module is exited in oil return, for detecting that the suction superheat reaches default disengaging value or the air conditioner at described time After running special time under oily pattern, oil return pattern is exited, completes oil return;
First recovery module, if for air conditioner operation in cooling mode, after oil return is completed, recovering the air conditioner Anti-freeze function and reach the function of being shut down during default cryogenic temperature;
Second recovery module, if for air conditioner operation in a heating mode, after oil return is completed, recovering the air conditioner Defrosting function and reach the function of being shut down during default heating temperature.
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