CN106091479B - Air conditioner and its method for controlling oil return and device - Google Patents

Air conditioner and its method for controlling oil return and device Download PDF

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Publication number
CN106091479B
CN106091479B CN201610428941.4A CN201610428941A CN106091479B CN 106091479 B CN106091479 B CN 106091479B CN 201610428941 A CN201610428941 A CN 201610428941A CN 106091479 B CN106091479 B CN 106091479B
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China
Prior art keywords
air conditioner
oil return
target
frequency
rotating speed
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CN201610428941.4A
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Chinese (zh)
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CN106091479A (en
Inventor
李远航
左双全
郑泽宏
于桥林
刘昭
张小勇
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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 CN201610428941.4A priority Critical patent/CN106091479B/en
Publication of CN106091479A publication Critical patent/CN106091479A/en
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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
    • F25B31/004Lubrication oil recirculating arrangements
    • 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

Abstract

The invention discloses a kind of air conditioner and its method for controlling oil return and device.Wherein, this method includes:Judge whether the operating condition of air conditioner meets preset condition, wherein, preset condition enters oil return program for triggering air conditioner;In the case where the operating condition for judging air conditioner meets preset condition, control air conditioner enters oil return program, to perform oil return operation, wherein, oil return operation includes at least:Improve the running frequency of cooler compressor.The present invention solves in the prior art, the technical issues of causing lubricant effect poor since compressor oil return is improper, and then cause compressor abrasion larger.

Description

Air conditioner and its method for controlling oil return and device
Technical field
The present invention relates to control field, in particular to a kind of air conditioner and its method for controlling oil return and device.
Background technology
At present air conditioner (for example, convertible frequency air-conditioner) carry out oil return mode be:When detect frequency continuously be less than certain frequency Oil return is begun to after operation certain time (for example, 17min), oil return time need are then determined according to different frequency and run time Will how long, finally reach lubrication compressor effect.It being needed in low-frequency operation every 17min oil returns once, oil return is more frequent, And there are certain irrationalities for the formulation of oil return frequency and oil return time.But oil return can break environment under air-conditioning low frequency Stable state causes room temperature to fluctuate, and be easy to cause temperature spot shutdown;And frequently oil return can cause frequent startup-shutdown, frequency Numerous oil return can increase compressor horsepower, and power consumption increases, and seriously affect heat pump performance and human body comfort.In oil return In the process, it is generally only the aperture of adjusting electric expansion valve, causes oil starvation inside compressor, lubricant effect is poor, causes compressor Abrasion it is larger, shorten the service life of compressor.
For it is above-mentioned the problem of, currently no effective solution has been proposed.
The content of the invention
An embodiment of the present invention provides a kind of air conditioner and its method for controlling oil return and device, at least to solve the prior art In, the technical issues of causing lubricant effect poor since compressor oil return is improper, and then cause compressor abrasion larger.
One side according to embodiments of the present invention provides a kind of method for controlling oil return of air conditioner, including:Judge institute Whether the operating condition for stating air conditioner meets preset condition, wherein, the preset condition enters back for triggering the air conditioner Oily program;In the case where the operating condition for judging the air conditioner meets the preset condition, control the air conditioner into Enter the oil return program, to perform oil return operation, wherein, the oil return operation includes at least:Improve the cooler compressor Current operation frequency.
Further, performing oil return operation includes:By the running frequency raising frequency of the compressor to oil return frequency;Detection institute State the indoor environment temperature and outdoor environment temperature of air conditioner local environment;According to the indoor environment temperature and the outdoor Environment temperature determines the corresponding rotating speed of target scope of the wind turbine of air conditioner and the corresponding target aperture of electric expansion valve of air conditioner Scope;The corresponding rotating speed of target scope of the wind turbine is being determined according to the indoor environment temperature and the outdoor environment temperature In the case of, it is initial speed by the adjustment of rotational speed of the wind turbine, wherein, the initial speed is according to the corresponding target of the wind turbine The range of speeds determines;Determining that the electric expansion valve corresponds to according to the indoor environment temperature and the outdoor environment temperature Target open range in the case of, the aperture of the electric expansion valve is adjusted to initial opening, wherein, the initial opening root It is determined according to the corresponding target open range of the electric expansion valve.
Further, the wind turbine includes indoor fan and outdoor fan, when the air conditioner operates in refrigeration mode, The method further includes:Detect the suction superheat of the compressor;Judge whether the suction superheat is more than predetermined threshold value; In the case where judging that the suction superheat is more than the predetermined threshold value, in the target open range, described in increase The aperture of electric expansion valve, in the range of the corresponding rotating speed of target of the indoor fan, reduce the indoor fan rotating speed, with And in the range of the corresponding rotating speed of target of the outdoor fan, the rotating speed of the outdoor fan is improved;Judging the air-breathing The degree of superheat be less than the predetermined threshold value in the case of, in the target open range, reduce the electric expansion valve aperture, In the range of the corresponding rotating speed of target of the indoor fan, the rotating speed of the indoor fan is improved and in the outdoor fan In the range of corresponding rotating speed of target, the rotating speed of the outdoor fan is reduced.
Further, the wind turbine includes indoor fan and outdoor fan, when the operating status of the air conditioner is heating During pattern, the method further includes:Detect the suction superheat of the compressor;It is pre- to judge whether the suction superheat is more than If threshold value;In the case where judging that the suction superheat is more than the predetermined threshold value, in the target open range, subtract The aperture of the small electric expansion valve, in the range of the corresponding rotating speed of target of the indoor fan, improve the indoor fan Rotating speed and in the range of the corresponding rotating speed of target of the outdoor fan, reduces the rotating speed of the outdoor fan;Judging Suction superheat is stated less than in the case of the predetermined threshold value, in the target open range, increases the electric expansion valve Aperture, in the range of the corresponding rotating speed of target of the indoor fan, reduce the rotating speed of the indoor fan and in the room In the range of the corresponding rotating speed of target of outer wind turbine, the rotating speed of the outdoor fan is improved.
Further, the method further includes:Detecting situation of the suction superheat equal to the predetermined threshold value Under, the air conditioner is controlled to exit the oil return program.
Further, the air conditioner is being controlled to enter oil return program, and after performing oil return operation, the method is also wrapped It includes:Enter in the air conditioner in the case that oil return program reaches the first object time, the air conditioner is controlled to exit described return Oily program.
Further, after the air conditioner is controlled to exit the oil return program, the method further includes:Reaching In the case of two object times, the detection of temperature spot stopping function and anti-freeze defencive function is performed to the air conditioner.
Further, in the case where the operating condition for judging the air conditioner meets the preset condition, and controlling When making the air conditioner and entering oil return program, the method further includes:Stop carrying out temperature spot stopping function to the air conditioner With the detection of anti-freeze defencive function.
Further, the preset condition includes:To be less than the running frequency operational objective duration of target frequency.
Another aspect according to embodiments of the present invention additionally provides a kind of oil return control device of air conditioner, including:Judge Unit, for judging whether the operating condition of the air conditioner meets preset condition, wherein, the preset condition is used to trigger institute It states air conditioner and enters oil return program;First control unit, it is described pre- for meeting in the operating condition for judging the air conditioner If in the case of condition, the air conditioner is controlled to enter the oil return program, to perform oil return operation, wherein, the oil return behaviour It includes at least:Improve the current operation frequency of the cooler compressor.
Further, first control unit includes:Raising frequency module, for by the running frequency raising frequency of the compressor To oil return frequency;Detection module, for detecting the indoor environment temperature and outdoor environment temperature of the air conditioner local environment; Determining module, for determining the corresponding target of the wind turbine of air conditioner according to the indoor environment temperature and the outdoor environment temperature The corresponding target open range of the electric expansion valve of the range of speeds and air conditioner;The first adjustment module, for according to the room Interior environment temperature and the outdoor environment temperature are determined under the corresponding rotating speed of target ambit of the wind turbine, by the wind turbine Adjustment of rotational speed for initial speed, wherein, the initial speed is determined according to the corresponding rotating speed of target scope of the wind turbine;Second Module is adjusted, for determining that the electric expansion valve corresponds to according to the indoor environment temperature and the outdoor environment temperature Target open range in the case of, the aperture of the electric expansion valve is adjusted to initial opening, wherein, the initial opening root It is determined according to the corresponding target open range of the electric expansion valve.
Further, the wind turbine includes indoor fan and outdoor fan, when the air conditioner operates in refrigeration mode, Described device further includes:Detection unit, for detecting the suction superheat of the compressor;Judging unit, it is described for judging Whether suction superheat is more than predetermined threshold value;The first adjustment unit, for judging that it is described pre- that the suction superheat is more than If in the case of threshold value, in the target open range, increase the aperture of the electric expansion valve, in the indoor fan pair In the range of the rotating speed of target answered, the rotating speed of the indoor fan is reduced and in the corresponding rotating speed of target model of the outdoor fan In enclosing, the rotating speed of the outdoor fan is improved;Second adjustment unit, for judging that it is described pre- that the suction superheat is less than If in the case of threshold value, in the target open range, reduce the aperture of the electric expansion valve, in the indoor fan pair In the range of the rotating speed of target answered, the rotating speed of the indoor fan is improved and in the corresponding rotating speed of target model of the outdoor fan In enclosing, the rotating speed of the outdoor fan is reduced.
Further, described device further includes:Second control unit, for detecting the suction superheat equal to institute In the case of stating predetermined threshold value, the air conditioner is controlled to exit the oil return program.
Further, the air conditioner is being controlled to enter oil return program, and after performing oil return operation, described device is also wrapped It includes:Second control unit, for entering in the air conditioner in the case that oil return program reaches the first object time, described in control Air conditioner exits the oil return program.
Further, described device further includes:Execution unit, for the air conditioner to be controlled to exit the oil return program Afterwards, in the case where reaching for the second object time, temperature spot stopping function is performed to the air conditioner and anti-freeze protects work( The detection of energy.
Further, described device further includes:Stop unit is being judged described in the operating condition satisfaction of the air conditioner In the case of preset condition, and when the air conditioner is controlled to enter oil return program, for stopping carrying out temperature to the air conditioner The detection of degree point stopping function and anti-freeze defencive function.
Another aspect according to embodiments of the present invention additionally provides a kind of air conditioner, including:What the above was provided appoints A kind of oil return control device of the air conditioner.
In embodiments of the present invention, whether preset condition is met using the operating condition for judging the air conditioner, wherein, institute It states preset condition and enters oil return program for triggering the air conditioner;Described in meeting in the operating condition for judging the air conditioner In the case of preset condition, the air conditioner is controlled to enter the oil return program, to perform oil return operation, wherein, the oil return Operation includes at least:The mode of the running frequency of the cooler compressor is improved, by meeting default oil return in air conditioner During condition, the running frequency of cooler compressor is improved so that the output power of compressor increases, so as to by enough Power sends back to oil in compressor again, and compressor is lubricated, and has reached and compressor is carried out fully during oil return The purpose of lubrication, it is achieved thereby that reduce compressor the degree of wear technique effect, and then solve in the prior art, due to Compressor oil return is improper to cause lubricant effect poor, and then the technical issues of cause compressor abrasion larger.
Description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description does not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings:
Fig. 1 is a kind of flow chart of the method for controlling oil return of air conditioner according to embodiments of the present invention;
Fig. 2 is the flow chart of the method for controlling oil return of another air conditioner according to embodiments of the present invention;And
Fig. 3 is a kind of schematic diagram of the oil return control device of air conditioner according to embodiments of the present invention.
Specific embodiment
In order to which those skilled in the art is made to more fully understand the present invention program, below in conjunction in the embodiment of the present invention The technical solution in the embodiment of the present invention is clearly and completely described in attached drawing, it is clear that described embodiment is only The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people Member's all other embodiments obtained without making creative work should all belong to the model that the present invention protects It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, " Two " etc. be the object for distinguishing similar, without being used to describe specific order or precedence.It should be appreciated that it so uses Data can exchange in the appropriate case, so as to the embodiment of the present invention described herein can with except illustrating herein or Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover Cover it is non-exclusive include, be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product Or the intrinsic other steps of equipment or unit.
According to embodiments of the present invention, a kind of embodiment of the method for the method for controlling oil return of air conditioner is provided, it is necessary to illustrate , step shown in the flowchart of the accompanying drawings can hold in the computer system of such as a group of computer-executable instructions Row, although also, show logical order in flow charts, it in some cases, can be to be different from order herein Perform shown or described step.
Fig. 1 is a kind of flow chart of the method for controlling oil return of air conditioner according to embodiments of the present invention, as shown in Figure 1, should Method includes the following steps:
Step S102, judges whether the operating condition of air conditioner meets preset condition, wherein, preset condition is used to trigger sky Device is adjusted to enter oil return program.
Specifically, preset condition can include:To be less than the running frequency operational objective duration of target frequency, above-mentioned steps S102 that is, judge whether the compressor of air conditioner to be less than the running frequency of target frequency has run target duration, if so, Then judge that air conditioner meets preset condition, conversely, then air conditioner is unsatisfactory for preset condition.
Wherein, target frequency and target duration can be set according to demand.
It should be noted that only running frequency and operation duration are satisfied by requiring, just it is considered to meet preset condition, if Have in running frequency and operation duration it is any be unsatisfactory for requirement (for example, running frequency not less than target frequency and/or operation when Long miss the mark duration), it is considered as being unsatisfactory for preset condition.
Step S104, in the case where the operating condition for judging air conditioner meets preset condition, control air conditioner enters Oil return program, to perform oil return operation, wherein, oil return operation includes at least:Improve the running frequency of cooler compressor.
In embodiments of the present invention, by when air conditioner meets default oil return condition, improving cooler compressor Running frequency so that the output power of compressor increases, so as to which oil is sent back in compressor again by enough power, Compressor is lubricated, has achieved the purpose that carry out sufficient lubrication to compressor during oil return, it is achieved thereby that reducing The technique effect of the degree of wear of compressor, and then solve in the prior art, lubrication is caused to be imitated since compressor oil return is improper Fruit is poor, and then the technical issues of cause compressor abrasion larger.
Optionally, in embodiments of the present invention, target frequency is less than 15Hz, and target duration is more than 17min.
Optionally, in one alternate embodiment, as 10Hz≤target frequency≤15Hz, a length of 60min during target;When When target frequency is 10Hz, a length of 40min during target.
In embodiments of the present invention, air conditioner often according to low-frequency operation 40min or 60min when, just carry out an oil return, With in the prior art, air conditioner often just carries out an oil return and compares according to lower frequency (for example, 15Hz) operation 17min, reaches Extend the purpose of oil return time cycle, reduce oil return number, fluctuations in indoor temperature, frequent starting are asked caused by avoiding therefore Topic.
Optionally, in embodiments of the present invention, oil return operation is performed to comprise the following steps:
Step S1, by the running frequency raising frequency of compressor to oil return frequency.
Specifically, oil return frequency is the running frequency of compressor during oil return.Oil return frequency can be set according to demand It puts, but before needing higher than oil return program is not entered, the running frequency of compressor.For example, working as target frequency is higher than 10Hz, and it is low When 15Hz, oil return frequency could be provided as 25Hz;When target frequency is 10Hz, oil return frequency could be provided as 20Hz.
Above-mentioned steps S1 namely carries out raising frequency processing to compressor.
Step S2 detects the indoor environment temperature and outdoor environment temperature of air conditioner local environment.
Step S3 determines the corresponding rotating speed of target model of the wind turbine of air conditioner according to indoor environment temperature and outdoor environment temperature Enclose target open range corresponding with the electric expansion valve of air conditioner.
Step S4 is determining the corresponding rotating speed of target scope feelings of blowing machine according to indoor environment temperature and outdoor environment temperature It is initial speed by the adjustment of rotational speed of wind turbine under condition, wherein, initial speed is true according to the corresponding rotating speed of target scope of the wind turbine It is fixed.
Step S5 is determining the corresponding target aperture of electric expansion valve according to indoor environment temperature and outdoor environment temperature Under ambit, the aperture of electric expansion valve is adjusted to initial opening, wherein, initial opening is corresponding according to electric expansion valve Target open range determines.
In embodiments of the present invention, oil return operation also includes at least in addition to including improving the running frequency of compressor: It adjusts the rotating speed of air conditioner wind turbine, adjust the aperture of air conditioner electric expansion valve.During air conditioner enters oil return, by carrying The running frequency of high compressor adjusts the rotating speed of air conditioner wind turbine and adjusts the aperture of air conditioner electric expansion valve, Neng Goubao Corresponding pipeline pressure difference is demonstrate,proved, better oil return effect can be reached.
Optionally, wind turbine includes indoor fan and outdoor fan, wherein, according to indoor environment temperature and outdoor environment temperature Determine that the corresponding rotating speed of target scope of wind turbine includes:Determine that indoor fan corresponds to according to indoor environment temperature and outdoor environment temperature Rotating speed of target scope and the corresponding rotating speed of target model of outdoor fan is determined according to indoor environment temperature and outdoor environment temperature It encloses;In the case where determining the corresponding rotating speed of target ambit of blowing machine according to indoor environment temperature and outdoor environment temperature, by wind turbine Adjustment of rotational speed include for initial speed:By the adjustment of rotational speed of indoor fan for the initial speed of indoor fan and by outdoor The adjustment of rotational speed of wind turbine is the initial speed of outdoor fan, wherein, the initial speed of indoor fan is corresponding according to indoor fan Rotating speed of target scope determines that the initial speed of outdoor fan is determined according to the corresponding rotating speed of target scope of outdoor fan.
It specifically, can be based on the temperature range model built in advance, further according to indoor environment temperature and outdoor environment temperature Degree determines rotating speed of target scope and target open range.Comprising multiple by indoor environment temperature and outdoor in temperature range model The temperature range of environment temperature composition, each temperature range is rule of thumb or experiment is preset with corresponding electronic expansion The open range of valve, the range of speeds of outdoor fan and the range of speeds of indoor fan, electric expansion valve, outdoor when air conditioner When wind turbine and indoor fan are operated in corresponding preset range, it can ensure corresponding pipeline pressure difference, achieve the effect that oil return.
The dividing mode for the temperature range being made of in temperature range model indoor environment temperature and outdoor environment temperature is such as Under:It is that an index is that outdoor environment temperature and indoor environment temperature are divided such as using range of temperature as 5 DEG C, works as outdoor Environment temperature is in the range of 35 DEG C -40 DEG C, if indoor environment temperature is set to first interval at 35 DEG C -40 DEG C at this time, if at this time Indoor environment is then set to second interval ... ... at 30 DEG C -35 DEG C, if indoor environment temperature is 0 DEG C -5 DEG C, is set to the 8th Section, outdoor environment temperature be 30 DEG C -35 DEG C, and indoor environment temperature be 35 DEG C -340 DEG C when, then be set to the 9th space, according to Secondary to analogize, outdoor environment temperature is 0 DEG C -5 DEG C, and indoor environment temperature is set to N spaces for 35 DEG C -40 DEG C.
Optionally, wind turbine includes indoor fan and outdoor fan, and when air conditioner operates in refrigeration mode, method further includes Following steps:
Step S9 detects the suction superheat of compressor.
Step S11, judges whether suction superheat is more than predetermined threshold value.
Step S13, in the case where judging that suction superheat is more than predetermined threshold value, in target open range, increase In the range of the corresponding rotating speed of target of the aperture of electric expansion valve, indoors wind turbine, the rotating speed of indoor fan is reduced and in outdoor In the range of the corresponding rotating speed of target of wind turbine, the rotating speed of outdoor fan is improved.
Suction superheat is reduced by the regulative mode of step S13, avoids compressing caused by suction superheat is excessive Machine coil temperature protection switch is acted and shut down.
Step S15 in the case where judging that suction superheat is less than predetermined threshold value, in target open range, reduces In the range of the corresponding rotating speed of target of the aperture of electric expansion valve, indoors wind turbine, the rotating speed of indoor fan is improved and in outdoor In the range of the corresponding rotating speed of target of wind turbine, the rotating speed of outdoor fan is reduced.
Suction superheat is raised by the regulative mode of step S15, avoids compressing caused by suction superheat is too small Machine rotor damages.
When air conditioner operates in refrigeration mode, the rotating speed of aperture, indoor fan in above-mentioned adjustment electric expansion valve with And during the rotating speed of outdoor fan, anti-freeze function is shielded.
Optionally, wind turbine includes indoor fan and outdoor fan, when the operating status of air conditioner is heating mode, method It further includes:
Step S19 detects the suction superheat of compressor.
Step S21, judges whether suction superheat is more than predetermined threshold value.
Step S23 in the case where judging that suction superheat is more than predetermined threshold value, in target open range, reduces In the range of the corresponding rotating speed of target of the current aperture of electric expansion valve, indoors wind turbine, improve indoor fan current rotating speed, with And in the range of the corresponding rotating speed of target of outdoor fan, the current rotating speed of outdoor fan is reduced.
Suction superheat is reduced by the regulative mode of step S23, avoids compressing caused by suction superheat is excessive Machine coil temperature protection switch is acted and shut down.
Step S25, in the case where judging that suction superheat is less than predetermined threshold value, in target open range, increase In the range of the corresponding rotating speed of target of the current aperture of electric expansion valve, indoors wind turbine, reduce indoor fan current rotating speed, with And in the range of the corresponding rotating speed of target of outdoor fan, the current rotating speed of outdoor fan is improved.
Suction superheat is raised by the regulative mode of step S25, avoids compressing caused by suction superheat is too small Machine rotor damages.
In embodiments of the present invention, by compressor raising frequency, adjusting indoor wind respectively in the corresponding range of speeds The rotating speed of machine and outdoor fan avoids because control indoor fan and outdoor fan stop operating, causes the pipeline temperature in air-conditioning Degree declines very fast, the problem of so as to cause oil return improper, has achieved the effect that further improve compressor lubrication degree.
Optionally, in embodiments of the present invention, in both cases air conditioner can be controlled to exit oil return program, specifically such as Under:
Situation one:In the case where detecting that suction superheat is equal to predetermined threshold value, control air conditioner exits oil return program.
Situation two:Enter in air conditioner in the case that oil return program reaches the first object time, control air conditioner exits back Oily program.
Specifically, the first object time can be set according to demand, for example, 5min.
It should be noted that as long as any one situation occur in above-mentioned two situations, just air conditioner is controlled to exit oil return journey Sequence.
Optionally, after control air conditioner exits oil return program, method further includes:Reaching the feelings of the second object time Under condition, the detection of temperature spot stopping function and anti-freeze defencive function is performed to air conditioner.
Specifically, the second object time can be set according to demand, for example, 5min.
In embodiments of the present invention, when air conditioner operates in refrigeration mode, exit oil return program in air conditioner and reach In the case of two object times, recover to carry out air conditioner the inspection of the conditions such as temperature spot halt condition and anti-freeze protective condition It surveys, that is, air conditioner recovers the state before oil return program, other defencive functions normally perform.The anti-freeze protection limit of air conditioner Frequency reducing detection is effective.
Wherein, temperature spot stopping function is temperature spot halt condition, and temperature spot halt condition is in process of refrigerastion, is reached It is shut down during to preset temperature.Anti-freeze defencive function is anti-freeze protective condition, reaches some in the operating condition of air conditioner During condition, in order to avoid air conditioner freezes taken safeguard measure.
It should be noted that before air conditioner carries out oil return program, it, can be to air conditioner during air conditioner is run The detection of the conditions such as temperature spot halt condition and anti-freeze protective condition of progress, but when air conditioner enters oil return program, During oil return, the detection of the conditions such as temperature spot halt condition and anti-freeze protective condition is not carried out to air conditioner.And wait air-conditionings After device exits oil return program certain time (that is, the second object time), (that is, recovery) above-mentioned item can be carried out to air conditioner again The detection of part.
In order to avoid air conditioner is during oil return, anti-freeze pattern or anti-freeze mode influences air-conditioning are converted to suddenly The oil return process of device, causes air conditioner oil returning to cause compressor abrasion not in time, optionally, when air conditioner operates in refrigeration mode When, in the case where the operating condition for judging air conditioner meets preset condition, and when air conditioner is controlled to enter oil return program, Method further includes:Stop carrying out air conditioner the detection of temperature spot stopping function and anti-freeze defencive function.
It can be seen from the above content that the scheme that the embodiment of the present invention is provided, advantage specific as follows:Equalized temperature indoors Under state, low frequency oil return will not cause room temperature to fluctuate, and meet comfort requirement;Infrequently oil return under low frequency, will not cause Frequent starting after air-conditioning is shut down up to temperature spot;Extend the low frequency oil return time cycle, reduce low frequency oil return number, effectively reduce air-conditioning Power consumption;It can ensure air conditioning comfortableness and compressor reliability.
Fig. 2 is the flow chart of the method for controlling oil return of another air conditioner according to embodiments of the present invention, referring to Fig. 2, sheet Inventive embodiments include:
Step S202, operation of air conditioner, specifically, control air conditioner are in operating status.
Step S204, judges whether the running frequency of air-conditioning is less than or equal to X1Hz, is judging that running frequency is less than or equal to In the case of X1Hz, step S206 is performed, conversely, then performing step S208.
Specifically, X1Hz is equivalent to the target frequency in above-described embodiment, can equally set according to demand.
Step S206, judges whether the run time of air-conditioning is more than or equal to X2min, is judging that run time is more than or equal to In the case of X2min, step S210 is performed, conversely, then performing step S208.
Specifically, X2min is equivalent to the target duration in above-described embodiment, can equally set according to demand.
Step S208 does not enter oil return program.
Step S210, into oil return program.
Specifically, control air conditioner enters oil return program.After air conditioner enters oil return program, while perform step S212, step S214 and step S216.
Step S212 adjusts indoor fan rotating speed, outdoor fan rotating speed.
Wherein, the process that the rotating speed of indoor fan and outdoor fan is adjusted has been described in detail in the above embodiments, It is not repeated to describe herein.
Step S214, by the running frequency raising frequency of compressor to oil return frequency.
Step S216 adjusts the aperture of electric expansion valve.
Wherein, the process that electronic expansion valve opening is adjusted has been described in detail in the above embodiments, it is no longer heavy herein Multiple description.
Whether step S218, the time judged into oil return program are more than X3min.Wherein, judging that run time is big In the case of equal to X3min, step S220 is performed, conversely, then continuing to execute step S212, step S214 and step S216.
Specifically, X3min is equivalent to the first object time in above-described embodiment, can equally set according to demand.
Step S220 exits oil return program, replys the state into before oil return program.
To sum up, the scheme that the embodiment of the present invention is provided compared to oil return scheme of the prior art, can provide sufficient pressure The reliability of contracting machine can also meet oil return effect.
According to embodiments of the present invention, a kind of oil return control device of air conditioner is additionally provided.The oil return control of the air conditioner Device is used to perform the method for controlling oil return of the air conditioner in above-described embodiment, the air-conditioning provided below the embodiment of the present invention The oil return control device of device does specific introduction:
Fig. 3 is a kind of schematic diagram of the oil return control device of air conditioner according to embodiments of the present invention, as shown in figure 3, should Determining device mainly includes 31 and first control unit 33 of judging unit, wherein:
Judging unit 31, for judging whether the operating condition of air conditioner meets preset condition, wherein, preset condition is used for Triggering air conditioner enters oil return program.
Specifically, preset condition can include:To be less than the running frequency operational objective duration of target frequency, above-mentioned judgement Unit 31 that is, judge whether the compressor of air conditioner to be less than the running frequency of target frequency has run target duration, if It is then to judge that air conditioner meets preset condition, conversely, then air conditioner is unsatisfactory for preset condition.
Wherein, target frequency and target duration can be set according to demand.
First control unit 33, in the case of meeting preset condition in the operating condition for judging air conditioner, control Air conditioner enters oil return program, to perform oil return operation, wherein, oil return operation includes at least:Improve working as cooler compressor Preceding running frequency.
In embodiments of the present invention, by when air conditioner meets default oil return condition, improving cooler compressor Running frequency so that the output power of compressor increases, so as to which oil is sent back in compressor again by enough power, Compressor is lubricated, has achieved the purpose that carry out sufficient lubrication to compressor during oil return, it is achieved thereby that reducing The technique effect of the degree of wear of compressor, and then solve in the prior art, lubrication is caused to be imitated since compressor oil return is improper Fruit is poor, and then the technical issues of cause compressor abrasion larger.
Optionally, in embodiments of the present invention, target frequency is less than 15Hz, and target duration is more than 17min.
Optionally, in one alternate embodiment, as 10Hz≤target frequency≤15Hz, a length of 60min during target;When When target frequency is 10Hz, a length of 40min during target.
In embodiments of the present invention, air conditioner often according to low-frequency operation 40min or 60min when, just carry out an oil return, With in the prior art, air conditioner often just carries out an oil return and compares according to lower frequency (for example, 15Hz) operation 17min, reaches Extend the purpose of oil return time cycle, reduce oil return number, fluctuations in indoor temperature, frequent starting are asked caused by avoiding therefore Topic.
Optionally, in embodiments of the present invention, the first control unit includes:Raising frequency module, for by the operation of compressor Frequency raising frequency is to oil return frequency;Detection module, for detecting the indoor environment temperature of air conditioner local environment and outdoor environment Temperature;Determining module, for determining the corresponding rotating speed of target of air conditioner wind turbine according to indoor environment temperature and outdoor environment temperature Scope and the corresponding target open range of air conditioner electric expansion valve;The first adjustment module, for according to indoor environment temperature It is determined with outdoor environment temperature under the corresponding rotating speed of target ambit of blowing machine, is initial speed by the adjustment of rotational speed of wind turbine, Wherein, initial speed is determined according to the corresponding rotating speed of target scope of wind turbine;Second adjustment module, for according to indoor environment temperature In the case of degree determines the corresponding target open range of electric expansion valve with outdoor environment temperature, by the aperture tune of electric expansion valve Whole is initial opening, wherein, initial opening is determined according to the corresponding target open range of electric expansion valve.
In embodiments of the present invention, oil return operation also includes at least in addition to including improving the running frequency of compressor: It adjusts the rotating speed of air conditioner wind turbine, adjust the aperture of air conditioner electric expansion valve.During air conditioner enters oil return, by carrying The running frequency of high compressor adjusts the rotating speed of air conditioner wind turbine and adjusts the aperture of air conditioner electric expansion valve, Neng Goubao Corresponding pipeline pressure difference is demonstrate,proved, better oil return effect can be reached.
Optionally, in embodiments of the present invention, wind turbine includes indoor fan and outdoor fan, when air conditioner operates in refrigeration During pattern, device further includes:Detection unit, for detecting the suction superheat of compressor;Judging unit, for judging air-breathing mistake Whether temperature is more than predetermined threshold value;The first adjustment unit, for judge suction superheat be more than predetermined threshold value in the case of, In target open range, increase the aperture of electric expansion valve, indoors in the range of the corresponding rotating speed of target of wind turbine, reduce indoor The rotating speed of wind turbine and in the range of the corresponding rotating speed of target of outdoor fan, improves the rotating speed of outdoor fan;Second adjustment list Member, in the case where judging that suction superheat is less than predetermined threshold value, in target open range, reducing electric expansion valve Aperture, indoors in the range of the corresponding rotating speed of target of wind turbine, improve the rotating speed of indoor fan and corresponding in outdoor fan In the range of rotating speed of target, the rotating speed of outdoor fan is reduced.
In embodiments of the present invention, by compressor raising frequency, adjusting indoor wind respectively in the corresponding range of speeds The rotating speed of machine and outdoor fan avoids because control indoor fan and outdoor fan stop operating, causes the pipeline temperature in air-conditioning Degree declines very fast, the problem of so as to cause oil return improper, has achieved the effect that further improve compressor lubrication degree.
Optionally, in embodiments of the present invention, device further includes:Second control unit, for detecting suction superheat In the case that degree is equal to predetermined threshold value, control air conditioner exits oil return program.
Optionally, in embodiments of the present invention, control air conditioner enter oil return program, and perform oil return operation after, Device further includes:Second control unit, for entering in air conditioner in the case that oil return program reaches the first object time, control Air conditioner exits oil return program.
Specifically, the first object time can be set according to demand, for example, 5min.
Optionally, in embodiments of the present invention, device further includes:Execution unit, for exiting oil return in control air conditioner After program, in the case where reaching for the second object time, temperature spot stopping function is performed to air conditioner and anti-freeze protects work( The detection of energy.
Specifically, the second object time can be set according to demand, for example, 5min.
In embodiments of the present invention, when air conditioner operates in refrigeration mode, exit oil return program in air conditioner and reach In the case of two object times, recover to carry out air conditioner the inspection of the conditions such as temperature spot halt condition and anti-freeze protective condition It surveys, that is, air conditioner recovers the state before oil return program, other defencive functions normally perform.The anti-freeze protection limit of air conditioner Frequency reducing detection is effective.
In order to avoid air conditioner is during oil return, anti-freeze pattern or anti-freeze mode influences air-conditioning are converted to suddenly The oil return process of device, causes air conditioner oil returning to cause compressor abrasion not in time, optionally, in embodiments of the present invention, device It further includes:Stop unit, in the case where the operating condition for judging air conditioner meets preset condition, and control air conditioner into When entering oil return program, for stopping carrying out air conditioner the detection of temperature spot stopping function and anti-freeze defencive function.
In addition, the embodiment of the present invention additionally provides a kind of air conditioner, which includes the above of the embodiment of the present invention The oil return control device of any air conditioner provided.
Optionally, which is transducer air conditioning.
In the above embodiment of the present invention, all emphasize particularly on different fields to the description of each embodiment, do not have in some embodiment The part of detailed description may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei A kind of division of logic function, can there is an other dividing mode in actual implementation, for example, multiple units or component can combine or Person is desirably integrated into another system or some features can be ignored or does not perform.Another, shown or discussed is mutual Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module It connects, can be electrical or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit The component shown may or may not be physical location, you can be located at a place or can also be distributed to multiple On unit.Some or all of unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also That unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list The form that hardware had both may be employed in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and is independent production marketing or use When, it can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially The part to contribute in other words to the prior art or all or part of the technical solution can be in the form of software products It embodies, which is stored in a storage medium, is used including some instructions so that a computer Equipment (can be personal computer, server or network equipment etc.) perform each embodiment the method for the present invention whole or Part steps.And foregoing storage medium includes:USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can to store program code Medium.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (11)

1. a kind of method for controlling oil return of air conditioner, which is characterized in that including:
Judge whether the operating condition of the air conditioner meets preset condition, wherein, the preset condition is used to trigger the sky Device is adjusted to enter oil return program;
In the case where the operating condition for judging the air conditioner meets the preset condition, the air conditioner is controlled to enter institute Oil return program is stated, to perform oil return operation, wherein, the oil return operation includes at least:Improve working as the cooler compressor Preceding running frequency;
Wherein, the current operation frequency of the cooler compressor is target frequency;When the target frequency is higher than 10Hz, and it is low When 15Hz, the oil return set of frequency is 25Hz;When the target frequency is 10Hz, the oil return set of frequency is 20Hz;
Wherein, the preset condition includes:To be less than the running frequency operational objective duration of the target frequency, when 10Hz < institutes When stating target frequency≤15Hz, a length of 60min during the target;When the target frequency is 10Hz, when target, is a length of 40min。
2. according to the method described in claim 1, it is characterized in that, performing oil return operation includes:
By the running frequency raising frequency of the compressor to oil return frequency;
Detect the indoor environment temperature and outdoor environment temperature of the air conditioner local environment;
The corresponding rotating speed of target scope of the wind turbine of air conditioner is determined according to the indoor environment temperature and the outdoor environment temperature Target open range corresponding with the electric expansion valve of air conditioner;
The corresponding rotating speed of target scope of the wind turbine is being determined according to the indoor environment temperature and the outdoor environment temperature In the case of, it is initial speed by the adjustment of rotational speed of the wind turbine, wherein, the initial speed is according to the corresponding target of the wind turbine The range of speeds determines;
Determining that the corresponding target of the electric expansion valve is opened according to the indoor environment temperature and the outdoor environment temperature It spends under ambit, the aperture of the electric expansion valve is adjusted to initial opening, wherein, the initial opening is according to the electricity The corresponding target open range of sub- expansion valve determines.
3. according to the method described in claim 2, it is characterized in that, the wind turbine include indoor fan and outdoor fan, work as institute When stating air conditioner and operating in refrigeration mode, the method further includes:
Detect the suction superheat of the compressor;
Judge whether the suction superheat is more than predetermined threshold value;
In the case where judging that the suction superheat is more than the predetermined threshold value, in the target open range, increase The aperture of the electric expansion valve, in the range of the corresponding rotating speed of target of the indoor fan, reduce the indoor fan turn Speed and in the range of the corresponding rotating speed of target of the outdoor fan, improve the rotating speed of the outdoor fan;
In the case where judging that the suction superheat is less than the predetermined threshold value, in the target open range, reduce The aperture of the electric expansion valve, in the range of the corresponding rotating speed of target of the indoor fan, improve the indoor fan turn Speed and in the range of the corresponding rotating speed of target of the outdoor fan, reduce the rotating speed of the outdoor fan.
4. according to the method described in claim 3, it is characterized in that, the method further includes:
In the case where detecting that the suction superheat is equal to the predetermined threshold value, the air conditioner is controlled to exit the oil return Program.
5. it according to the method described in claim 1, it is characterized in that, the air conditioner is being controlled to enter oil return program, and performs After oil return operation, the method further includes:
Enter in the air conditioner in the case that oil return program reaches the first object time, the air conditioner is controlled to exit described return Oily program.
6. according to the method described in claim 5, it is characterized in that, control the air conditioner exit the oil return program it Afterwards, the method further includes:
In the case where reaching for the second object time, temperature spot stopping function and anti-freeze defencive function are performed to the air conditioner Detection.
7. according to the method described in claim 1, it is characterized in that, described in meeting in the operating condition for judging the air conditioner In the case of preset condition, and when the air conditioner is controlled to enter oil return program, the method further includes:
Stop carrying out the air conditioner detection of temperature spot stopping function and anti-freeze defencive function.
8. a kind of oil return control device of air conditioner, which is characterized in that including:
Judging unit, for judging whether the operating condition of the air conditioner meets preset condition, wherein, the preset condition is used Enter oil return program in triggering the air conditioner;
First control unit, in the case of meeting the preset condition in the operating condition for judging the air conditioner, control It makes the air conditioner and enters the oil return program, to perform oil return operation, wherein, the oil return operation includes at least:Improve institute State the current operation frequency of cooler compressor;
Wherein, the current operation frequency of the cooler compressor is target frequency;When the target frequency is higher than 10Hz, and it is low When 15Hz, the oil return set of frequency is 25Hz;When the target frequency is 10Hz, the oil return set of frequency is 20Hz;
Wherein, the preset condition includes:To be less than the running frequency operational objective duration of the target frequency, when 10Hz < institutes When stating target frequency≤15Hz, a length of 60min during the target;When the target frequency is 10Hz, when target, is a length of 40min。
9. device according to claim 8, which is characterized in that first control unit includes:
Raising frequency module, for by the running frequency raising frequency of the compressor to oil return frequency;
Detection module, for detecting the indoor environment temperature and outdoor environment temperature of the air conditioner local environment;
Determining module, for determining that the wind turbine of air conditioner is corresponding according to the indoor environment temperature and the outdoor environment temperature The corresponding target open range of the electric expansion valve of rotating speed of target scope and air conditioner;
The first adjustment module, for determining the wind turbine pair according to the indoor environment temperature and the outdoor environment temperature It is initial speed by the adjustment of rotational speed of the wind turbine under the rotating speed of target ambit answered, wherein, the initial speed is according to institute The corresponding rotating speed of target scope of wind turbine is stated to determine;
Second adjustment module, for determining that the electronics is swollen according to the indoor environment temperature and the outdoor environment temperature In the case of the corresponding target open range of swollen valve, the aperture of the electric expansion valve is adjusted to initial opening, wherein, it is described just Beginning aperture is determined according to the corresponding target open range of the electric expansion valve.
10. device according to claim 9, which is characterized in that the wind turbine includes indoor fan and outdoor fan, works as institute When stating air conditioner and operating in refrigeration mode, described device further includes:
Detection unit, for detecting the suction superheat of the compressor;
Judging unit, for judging whether the suction superheat is more than predetermined threshold value;
The first adjustment unit, for judge the suction superheat be more than the predetermined threshold value in the case of, in the mesh It marks in open range, increases the aperture of the electric expansion valve, in the range of the corresponding rotating speed of target of the indoor fan, reduce The rotating speed of the indoor fan and in the range of the corresponding rotating speed of target of the outdoor fan, improves the outdoor fan Rotating speed;
Second adjustment unit, for judge the suction superheat be less than the predetermined threshold value in the case of, in the mesh It marks in open range, reduces the aperture of the electric expansion valve, in the range of the corresponding rotating speed of target of the indoor fan, improve The rotating speed of the indoor fan and in the range of the corresponding rotating speed of target of the outdoor fan, reduces the outdoor fan Rotating speed.
11. a kind of air conditioner, which is characterized in that including:The oil return control of air conditioner any one of claim 8 to 10 Device.
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EP3882533A4 (en) * 2018-11-16 2022-01-05 Qingdao Haier Air-Conditioning Electronic Co., Ltd Control method and system for refrigeration, oil return and noise reduction of multi-split air-conditioner

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