CN105588282A - Detection method and device for air conditioning system greasy blockage and air conditioner - Google Patents
Detection method and device for air conditioning system greasy blockage and air conditioner Download PDFInfo
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- CN105588282A CN105588282A CN201511034230.0A CN201511034230A CN105588282A CN 105588282 A CN105588282 A CN 105588282A CN 201511034230 A CN201511034230 A CN 201511034230A CN 105588282 A CN105588282 A CN 105588282A
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- conditioning system
- pressure value
- stifled
- oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
Abstract
The invention provides a detection method and device for air conditioning system greasy blockage, and an air conditioner. A cooling agent used by an air conditioning system is a flammable cooling agent. The detection method comprises the steps that whether the air conditioning system is in a preset operating state or not is judged; when the air conditioning system is judged to be in the preset operating state, the exhaust pressure value of an exhaust outlet of a compressor of the air conditioning system and the air returning pressure value of an air returning inlet of the compressor are both detected at every other first preset time; whether the difference value of the exhaust pressure value and the air returning pressure value is less than or equal to a preset pressure value or not is judged; and whether greasy blockage occurs in the air conditioning system or not is determined according to the judgment result. According to the technical scheme, whether greasy blockage occurs in the air conditioning system which using the flammable cooling agent or not can be determined effectively in time, and accordingly the phenomenon that the capacity of the air conditioning system is damped due to greasy blockage is avoided, so that the service life of the compressor and the air conditioning system is ensured.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to the stifled detection of a kind of air-conditioning system oilMethod, stifled checkout gear and a kind of air-conditioner of a kind of air-conditioning system oil.
Background technology
At present, in air conditioner refrigerating technical field, mostly substitute R22 with R410a cold-producing mediumCold-producing medium, its with the obvious advantage being embodied on convertible frequency air-conditioner, but due to the GWP of R410a cold-producing medium(GlobalWarmingPotential, global warming potential) is higher, imitates in Present Global greenhouseShould be day by day serious, under the background of countries in the world replies global climate transition pay attention to day by day, will be by graduallyEliminate. Therefore, more absorbed research is at present low as representative taking R32 cold-producing medium, R290 cold-producing mediumGWP cold-producing medium, particularly for this cold-producing medium that does not almost have any pollution of R290 cold-producing medium, withTime, the research and development of corresponding compressor are also underway, the particularly lubricating oil of new type compressor research and development,Day by day come into one's own.
Lubricating oil in cooler compressor is extremely important to the normal operation of system, and lubricating oil risesCylinder and rotor lubrication, sealing and cooling effect. In the time that compressor runs well, lubricating oilSuck cylinder by bent axle from compressor bottom, after overcompression, follow the cold-producing medium of HTHP to enterSystem, afterwards along with refrigerant circulation is got back to compressor bottom, simultaneously compressor electric motor and cylinder againThe heat producing also can cooled dose and lubricating oil take away. If cause for some reason oil return return-airNot smooth, will cause the problem such as compressor lubrication shortage of oil, motor idle running heating, further will leadCause between compresser cylinder and rotor that wearing and tearing strengthen, internal temperature is too high, finally cause burn-down of electric motor, beSystem collapse. So in the time of system, must ensure lubricating oil can normally return compressor andMotor heat is discharged timely.
But for combustible refrigerant-R290 cold-producing medium, its viscosity can sharply increase at low temperaturesAdd, particularly in changes in temperature frequency changer, in the time that defrosting finishes cross valve commutation, evaporimeter (indoor changingHot device) in super low temperature refrigeration agent and lubricating oil need to pass through throttling arrangement (such as, electric expansion valve)Enter condenser (outdoor heat exchanger), simultaneously combustible refrigerant because of security consideration charging amount less,Therefore the pressure of the air-conditioning system of the pressure ratio R410a cold-producing medium of air-conditioning system, R32 cold-producing medium is very littleMany, thus can cause the oil that ratio of viscosities is larger to stop up throttling arrangement, cause combustible refrigerant to joinWith circulation, and then make compressor idle running, ability and operate power decline, and system oil starvation lacks fluorine, when longBetween the motor excessive heating of compressor after running, greatly reduce service life of compressor and system,Affect user's use impression, the appearance of this problem is simultaneously also that design is used combustible refrigerantAir-conditioning system causes very large impact.
Therefore, how to determine timely and effectively and use the air-conditioning system of combustible refrigerant whether oil occursStifled, and then avoid air-conditioning system because of the stifled phenomenon that occurs ability decay of oil, to ensure compressor and air-conditioningThe service life of system, improve the comfort of air-conditioning system simultaneously, become technology urgently to be resolved hurrilyProblem.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art or correlation technique.
For this reason, one object of the present invention has been to propose the stifled detection method of a kind of air-conditioning system oil.
Another object of the present invention has been to propose the stifled checkout gear of a kind of air-conditioning system oil.
Another object of the present invention is to have proposed a kind of air-conditioner.
For realizing above-mentioned at least one object, embodiment according to a first aspect of the invention, has proposedThe detection method that air-conditioning system oil is stifled, the cold-producing medium that described air-conditioning system is used freezes for combustibilityAgent, described method comprises: judge that whether described air-conditioning system is in default duty; Judging instituteState air-conditioning system in the time of described default duty, detect respectively described sky every the first Preset TimeThe return-air at the gas returning port place of the exhaust pressure value of the exhaust ports of the compressor of adjusting system and described compressorForce value; Whether the difference that judges described exhaust pressure value and described back pressure value is less than or equal in advanceIf force value; Determine according to judged result whether described air-conditioning system oil occurs stifled.
The stifled detection method of air-conditioning system oil that the embodiment of first aspect present invention provides, when judgement makes, need to open while there is the stifled default duty of oil in easy by the air-conditioning system of combustible refrigerantThe moving strategy that detects determines whether air-conditioning system oil occurs and block up, and then avoids air-conditioning system to occur because oil is stifledThe phenomenon of ability decay to ensure the service life of compressor and air-conditioning system, improves air-conditioning system simultaneouslyThe comfort of system, experiences thereby promote user, particularly, can divide every the first Preset TimeDo not detect the exhaust pressure value of exhaust ports of the compressor of air-conditioning system and the gas returning port place of compressorBack pressure value, and and then according to the difference of the exhaust pressure value detecting and back pressure value and defaultIt is stifled that the magnitude relationship of force value determines whether air-conditioning system oil occurs.
In addition, the stifled detection method of air-conditioning system oil in above-described embodiment provided by the invention, also canTo there is following additional technical feature:
In technique scheme, preferably, by be arranged on described compressor exhaust portsThe second pressure detecting module at the gas returning port place of one pressure detecting module and described compressor is every describedOne Preset Time detects respectively described exhaust pressure value and described back pressure value.
In this technical scheme, by be arranged on air-conditioning system compressor exhaust ports first pressPower detection module comes pre-every first with the second pressure detecting module at the gas returning port place that is arranged on compressorIf the force value of time detecting corresponding position, wherein, the first pressure detecting module and the inspection of the second pressureSurveying module can be preferably pressure sensor, so, can effectively improve force value testing resultAccuracy.
In above-mentioned arbitrary technical scheme, preferably, detect respectively every the first Preset Time describedThe gas returning port place of the exhaust pressure value of the exhaust ports of the compressor of described air-conditioning system and described compressorBack pressure value before, also comprise: add up described air-conditioning system in described default dutyThe accumulative total working time; In the time that the described accumulative total working time reaches the second Preset Time, every described firstPreset Time detects respectively described exhaust pressure value and described back pressure value.
In this technical scheme, in order further to improve the accuracy of force value testing result, can work asThe accumulative total working time that air-conditioning system is moved under default duty reaches after the second Preset Time, thenCarry out the pressure at expulsion that detects respectively the exhaust ports of the compressor of air-conditioning system every the first Preset TimeThe operation of the back pressure value at value and gas returning port place is entered after the pressure level-off of air-conditioning system againThe detection of row force value.
In above-mentioned arbitrary technical scheme, preferably, describedly determine described air-conditioning system according to judged resultIt is stifled whether system there is oil, specifically comprises: when judging described exhaust pressure value and described back pressure valueWhen difference is less than or equal to described preset pressure value, determine that oil occurs described air-conditioning system stifled.
In this technical scheme, when the row of the exhaust ports of compressor detected every the first Preset TimeWhen the difference of the back pressure value at atmospheric pressure value and gas returning port place is less than or equal to preset pressure value, canStifled to determine that oil has occurred air-conditioning system, further can take corresponding processing policy to solve oily stifled askingTopic, to avoid air-conditioning system because of the stifled phenomenon that occurs ability decay of oil, ensures compressor and air-conditioning systemService life, improve the comfort of air-conditioning system simultaneously, experience thereby promote user.
In above-mentioned arbitrary technical scheme, preferably, described default duty comprises: described air-conditioningDuty, described air-conditioning that the duty that system defrost starts, described air-conditioning system defrost finishDuty and the described air-conditioning system of system in low-temperature heating operates in lower than default environment temperatureDuty; And the difference of described exhaust pressure value and described back pressure value is absolute value; InstituteStating combustible refrigerant is R290 cold-producing medium.
In this technical scheme, easily there is the stifled default duty of oil and include but not limited in air-conditioning system:The duty that air-conditioning system defrost starts, duty, the air-conditioning system that air-conditioning system defrost finishesDuty and air-conditioning system in start in low-temperature heating operate in lower than default environment temperatureDuty, wherein, defrost finishes, defrost starts and the duty of low-temperature heating under air-conditioningThere is the stifled probability of oil and reduce successively in system, generally speaking, and when cold-producing medium meets with phase in air-conditioning systemWhile differing from the system environments of 30 DEG C of above temperature differences, just there will be oil stifled, and operate in subzeroWhen 15 DEG C of following environment, also can oil stifled, in the time of subzero 30 DEG C, oil be stifled certainly, in addition, works as air-conditioningIn the time of frequency conversion, severe, high operating mode or cryogenic refrigeration, also there is the stifled situation of oil in system.
And for how judging that whether air-conditioning system is in default duty, particularly, when air-conditioning systemWhen the postrun accumulative total of the cross valve start switching times of system is even number time, can determine air-conditioning system placeThe duty finishing in defrost, when accumulative total switching times is while being odd number time, can determine air-conditioning soSystem starts or is in the duty in defrost process in defrost, and is operated in low-temperature heatingDuty can be definite according to start parameters, and environment temperature can be passed through air-conditioning system particularlyExisting temperature sensor detects; In addition, for the exhaust pressure value of the exhaust ports of compressor with returnThe difference of the back pressure value at gas port place takes absolute value, to close by judgement and the size of preset pressure valueIt is stifled that system accurately determines whether air-conditioning system oil occurs, and combustible refrigerant be preferably low GWP,Almost do not have R290 (the being propane) cold-producing medium of any pollution.
Embodiment according to a second aspect of the invention, has proposed the stifled detection dress of a kind of air-conditioning system oilPut, the cold-producing medium that described air-conditioning system is used is combustible refrigerant, and described device comprises: judge mouldPiece, for judging that whether described air-conditioning system is in default duty; The first pressure detecting module,For in the time that described judge module is judged described air-conditioning system in described default duty, Mei GeOne Preset Time detects the exhaust pressure value of the exhaust ports of the compressor of described air-conditioning system; Second pressesPower detection module, for judging that at described judge module described air-conditioning system is in described default work shapeWhen state, detect every described the first Preset Time the compressor of described air-conditioning system gas returning port place returnAtmospheric pressure value; Described judge module also for: judge the institute that described the first pressure detecting module detectsThe difference of stating the described back pressure value that exhaust pressure value and described the second pressure detecting module detect isThe no preset pressure value that is less than or equal to; Determination module, for according to the judged result of described judge moduleDetermine whether described air-conditioning system oil occurs stifled.
The checkout gear that air-conditioning system that the embodiment of second aspect present invention provides oil is stifled, when by sentencingDisconnected module judges that the air-conditioning system of use combustible refrigerant is in the easy stifled default duty of oil that occursTime, need start detection strategy to determine whether air-conditioning system oil occurs stifled, and then avoid air-conditioning systemSystem is because of the stifled phenomenon that occurs ability decay of oil, to ensure the service life of compressor and air-conditioning system, sameThe comfort of Shi Tigao air-conditioning system, experiences thereby promote user, particularly, and can be every theOne Preset Time detects air-conditioning system by the first pressure detecting module and the second pressure detecting module respectivelyThe exhaust pressure value of exhaust ports of compressor and the back pressure value at the gas returning port place of compressor, andAnd then the difference of the exhaust pressure value detecting according to judge module by determination module and back pressure valueDetermine with the magnitude relationship of preset pressure value whether air-conditioning system oil occurs and block up.
In addition, the stifled checkout gear of air-conditioning system oil in above-described embodiment provided by the invention, also canTo there is following additional technical feature:
In technique scheme, preferably, described the first pressure detecting module is arranged on described compressionThe exhaust ports of machine; Described the second pressure detecting module is arranged on the gas returning port place of described compressor.
In this technical scheme, by be arranged on air-conditioning system compressor exhaust ports first pressPower detection module comes pre-every first with the second pressure detecting module at the gas returning port place that is arranged on compressorIf the force value of time detecting corresponding position, wherein, the first pressure detecting module and the inspection of the second pressureSurveying module can be preferably pressure sensor, so, can effectively improve force value testing resultAccuracy.
In above-mentioned arbitrary technical scheme, preferably, also comprise: statistical module, for describedOne pressure detecting module and described the second pressure detecting module detect every described the first Preset Time respectivelyThe gas returning port place of the exhaust pressure value of the exhaust ports of the compressor of described air-conditioning system and described compressorBack pressure value before, add up the accumulative total work of described air-conditioning system in described default dutyTime; Described the first pressure detecting module specifically for: when the described accumulative total of described statistical module countsWorking time, while reaching the second Preset Time, is detected described pressure at expulsion every described the first Preset TimeValue; Described the second pressure detecting module specifically for: when the described accumulative total work of described statistical module countsWhile reaching described the second Preset Time as the time, detect described return-air every described the first Preset Time and pressPower value.
In this technical scheme, in order further to improve the accuracy of force value testing result, can work asThe accumulative total working time of moving under default duty by the air-conditioning system of statistical module counts reachesAfter the second Preset Time, then carry out every the first Preset Time respectively by the first pressure detecting module andThe second pressure detecting module detects exhaust pressure value and the return-air of the exhaust ports of the compressor of air-conditioning systemForce value is carried out in the operation of the back pressure value at mouth place after the pressure level-off of air-conditioning system againDetection.
In above-mentioned arbitrary technical scheme, preferably, described determination module specifically for: sentence when describedIt is described default that disconnected module judges that the difference of described exhaust pressure value and described back pressure value is less than or equal toWhen force value, determine that oil occurs described air-conditioning system stifled.
In this technical scheme, when judging every the first Preset Time and compression detected by judge moduleThe difference of the back pressure value at the exhaust pressure value of the exhaust ports of machine and gas returning port place is less than or equal in advanceIf when force value, can determine that oil has occurred air-conditioning system by determination module stifled, further canTake corresponding processing policy to solve the stifled problem of oil, to avoid air-conditioning system to occur ability decay because oil is stifledPhenomenon, ensure service life of compressor and air-conditioning system, the use that simultaneously improves air-conditioning system is relaxedAdaptive, experiences thereby promote user.
In above-mentioned arbitrary technical scheme, preferably, described default duty comprises: described air-conditioningDuty, described air-conditioning that the duty that system defrost starts, described air-conditioning system defrost finishDuty and the described air-conditioning system of system in low-temperature heating operates in lower than default environment temperatureDuty; And the difference of described exhaust pressure value and described back pressure value is absolute value; InstituteStating combustible refrigerant is R290 cold-producing medium.
In this technical scheme, easily there is the stifled default duty of oil and include but not limited in air-conditioning system:The duty that air-conditioning system defrost starts, duty, the air-conditioning system that air-conditioning system defrost finishesDuty and air-conditioning system in start in low-temperature heating operate in lower than default environment temperatureDuty, wherein, defrost finishes, defrost starts and the duty of low-temperature heating under air-conditioningThere is the stifled probability of oil and reduce successively in system, generally speaking, and when cold-producing medium meets with phase in air-conditioning systemWhile differing from the system environments of 30 DEG C of above temperature differences, just there will be oil stifled, and operate in subzeroWhen 15 DEG C of following environment, also can oil stifled, in the time of subzero 30 DEG C, oil be stifled certainly, in addition, works as air-conditioningIn the time of frequency conversion, severe, high operating mode or cryogenic refrigeration, also there is the stifled situation of oil in system.
And for how judging that air-conditioning system is whether in default duty, particularly, when by sentencingDisconnected module is judged when the postrun accumulative total of the cross valve start switching times of air-conditioning system is inferior as even number,Can determine the duty that air-conditioning system finishes in defrost, so when judge accumulative total by judge moduleWhen switching times is odd number time, can determine that air-conditioning system starts or is in defrost process in defrostIn duty, can be by judge module according to start and be operated in the duty of low-temperature heatingParameters is definite, and environment temperature can be by judge module by the existing temperature of air-conditioning system particularlyThe testing result of sensor is determined; In addition, for the exhaust pressure value of the exhaust ports of compressor with returnThe difference of the back pressure value at gas port place takes absolute value, to close by judgement and the size of preset pressure valueIt is stifled that system accurately determines whether air-conditioning system oil occurs, and combustible refrigerant be preferably low GWP,Almost do not have R290 (the being propane) cold-producing medium of any pollution.
Embodiment according to a third aspect of the invention we, has proposed a kind of air-conditioner, comprises above-mentioned secondThe stifled checkout gear of air-conditioning system oil in aspect embodiment described in any one.
The air-conditioner that the embodiment of third aspect present invention provides, because comprising above-mentioned second aspect embodimentThe stifled checkout gear of air-conditioning system oil described in middle any one, thereby can determine timely and effectively useIt is stifled whether the air-conditioning system of combustible refrigerant there is oil, and then avoid air-conditioning system to occur energy because oil is stifledThe phenomenon of power decay to ensure the service life of compressor and air-conditioning system, improves air-conditioning system simultaneouslyComfort, promote user experience.
Additional aspect of the present invention and advantage in the following description part provide, and part will be from belowDescription in become obviously, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage be accompanying drawing retouching embodiment below combinationState middle becoming obviously and easily and understand, wherein:
Fig. 1 shows the stream of the stifled detection method of air-conditioning system oil according to an embodiment of the inventionJourney schematic diagram;
Fig. 2 shows the frame of the stifled checkout gear of air-conditioning system oil according to an embodiment of the inventionFigure;
Fig. 3 shows the block diagram of air-conditioner according to an embodiment of the invention.
Detailed description of the invention
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with attachedFigure and detailed description of the invention are further described in detail the present invention. It should be noted that, notIn the situation of conflict, the feature in the application's embodiment and embodiment can combine mutually.
Set forth in the following description a lot of details so that fully understand the present invention, still,The present invention can also adopt other to be different from other modes described here and implement, therefore, and the present inventionProtection domain be not subject to the restriction of following public specific embodiment.
Fig. 1 shows the stream of the stifled detection method of air-conditioning system oil according to an embodiment of the inventionJourney schematic diagram.
As shown in Figure 1, the stifled detection method of air-conditioning system oil according to an embodiment of the invention,The cold-producing medium that described air-conditioning system is used is combustible refrigerant, and described method comprises: step 102,Judge that whether described air-conditioning system is in default duty; Step 104, is judging that described air-conditioning isSystem, in the time of described default duty, detects respectively described air-conditioning system every the first Preset TimeThe back pressure value at the gas returning port place of the exhaust pressure value of the exhaust ports of compressor and described compressor;Step 106, judges whether the difference of described exhaust pressure value and described back pressure value is less than or equal toPreset pressure value; Step 108, determines according to judged result whether described air-conditioning system oil occurs stifled.
The stifled detection method of air-conditioning system oil that the embodiment of first aspect present invention provides, when judgement makes, need to open while there is the stifled default duty of oil in easy by the air-conditioning system of combustible refrigerantThe moving strategy that detects determines whether air-conditioning system oil occurs and block up, and then avoids air-conditioning system to occur because oil is stifledThe phenomenon of ability decay to ensure the service life of compressor and air-conditioning system, improves air-conditioning system simultaneouslyThe comfort of system, experiences thereby promote user, particularly, can divide every the first Preset TimeDo not detect the exhaust pressure value of exhaust ports of the compressor of air-conditioning system and the gas returning port place of compressorBack pressure value, and and then according to the difference of the exhaust pressure value detecting and back pressure value and defaultIt is stifled that the magnitude relationship of force value determines whether air-conditioning system oil occurs, wherein, and the first Preset TimeSpan is 0.5 second～5 seconds, and preset pressure value can be taken as 0.1 atmospheric pressure (0.01 millionHandkerchief).
In addition, the stifled detection method of air-conditioning system oil in above-described embodiment provided by the invention, also canTo there is following additional technical feature:
In technique scheme, preferably, by be arranged on described compressor exhaust portsThe second pressure detecting module at the gas returning port place of one pressure detecting module and described compressor is every describedOne Preset Time detects respectively described exhaust pressure value and described back pressure value.
In this technical scheme, by be arranged on air-conditioning system compressor exhaust ports first pressPower detection module comes pre-every first with the second pressure detecting module at the gas returning port place that is arranged on compressorIf the force value of time detecting corresponding position, wherein, the first pressure detecting module and the inspection of the second pressureSurveying module can be preferably pressure sensor, so, can effectively improve force value testing resultAccuracy.
In above-mentioned arbitrary technical scheme, preferably, detect respectively every the first Preset Time describedThe gas returning port place of the exhaust pressure value of the exhaust ports of the compressor of described air-conditioning system and described compressorBack pressure value before, also comprise: add up described air-conditioning system in described default dutyThe accumulative total working time; In the time that the described accumulative total working time reaches the second Preset Time, every described firstPreset Time detects respectively described exhaust pressure value and described back pressure value.
In this technical scheme, in order further to improve the accuracy of force value testing result, can work asThe accumulative total working time that air-conditioning system is moved under default duty reaches after the second Preset Time, thenCarry out the pressure at expulsion that detects respectively the exhaust ports of the compressor of air-conditioning system every the first Preset TimeThe operation of the back pressure value at value and gas returning port place is entered after the pressure level-off of air-conditioning system againThe detection of row force value, wherein, the second Preset Time preferably span is: 10 minutes～40 pointsClock.
In above-mentioned arbitrary technical scheme, preferably, described step 108 specifically comprises: when judging instituteWhen the difference of stating exhaust pressure value and described back pressure value is less than or equal to described preset pressure value, reallyIt is stifled to there is oil in fixed described air-conditioning system.
In this technical scheme, when the row of the exhaust ports of compressor detected every the first Preset TimeWhen the difference of the back pressure value at atmospheric pressure value and gas returning port place is less than or equal to preset pressure value, canStifled to determine that oil has occurred air-conditioning system, further can take corresponding processing policy to solve oily stifled askingTopic, to avoid air-conditioning system because of the stifled phenomenon that occurs ability decay of oil, ensures compressor and air-conditioning systemService life, improve the comfort of air-conditioning system simultaneously, experience thereby promote user.
Particularly can by one of at least solving in the processing policy described in following examples, oil is stifled asksTopic.
Embodiment mono-: by using caliber to be more than or equal to the throttling of default caliber (such as 1.5mm)Device solves the stifled problem of oil, increases the flow of throttling arrangement, and wherein, throttling arrangement comprises hairTubule, choke valve.
Embodiment bis-: by increasing the aperture of electric expansion valve, namely detecting that air-conditioning system sends outWhen oil generation blocks up, electric expansion valve (is generally to 450 step～480 by current regulation to default apertureStep), increase the flow of throttling arrangement, and (be generally with this default aperture operation certain hour5 minutes～10 minutes) after and detect when the stifled problem of oil solves, by being opened by default of electric expansion valveDegree regulates back current aperture to recover the stifled front normal operation of oil, otherwise prompt system fault shutdown, withAvoid making because oil is stifled air-conditioning system collapse.
Embodiment tri-: the mode by the bypass assembly in parallel of the throttling arrangement for air-conditioning system solves oilStifled problem, wherein, bypass assembly comprises: the bypass pipe being arranged in parallel with throttling arrangement and being arranged atStop valve on bypass pipe,, in the time detecting that oily blocking up occurs air-conditioning system, opening stop valve is closed jointStream device, so that cold-producing medium circulates in air-conditioning system through bypass assembly, and at operation certain hourAfter (being generally 5 minutes～10 minutes), reactivating throttling arrangement and close stop valve, and againOpen throttling arrangement certain hour (being generally 3 minutes～10 minutes), and system oil again detectedWhen stifled, prompt system fault shutdown.
Embodiment tetra-: be that the mode that throttling arrangement heats solves the stifled problem of oil by introducing external heat source,Particularly, heater (such as, anti-explosion heating band) is set, when sky being detected at throttling arrangement placeWhen oily blocking up occurs adjusting system, open heater a period of time (being generally 5 minutes～10 minutes),If the stifled problem of oil still unresolved continuation heats a period of time (being generally 10 minutes～20 minutes),If still oil is stifled after post bake, prompt system fault shutdown, if detect in process, oil is stifledSolve and close heater.
Embodiment five: by by the heat transporting producing in the air-conditioning system course of work to throttling arrangement placeFor the mode of its heating solves the stifled problem of oil, particularly, by the electric-controlled box in air-conditioning system and jointBetween stream device and/or compressor and throttling arrangement, flow-guiding channel is set respectively, and air-conditioning detectedThere is oil when stifled in system, makes at least one flow-guiding channel in work conducting state, with by electric-controlled box andThe heat transporting throttling arrangement place producing in/compressor operation, opens heating a period of time (oneAs be 5 minutes～10 minutes), if the stifled problem of oil still unresolved continue heating a period of time (generalBe 10 minutes～20 minutes), if still oil is stifled after post bake, prompt system fault shutdown,Close heater if stifled solution of oil detected in process.
Embodiment six: by repeat to switch the mode of cross valve according to predetermined period in Preset TimeSolve the stifled problem of oil, wherein, Preset Time is that the experience of guaranteeing user is generally set in 30 pointsIn clock, predetermined period preferably can be set to 5 minutes, if in process, air-conditioning system detectedWhen the stifled problem of oil solves, cross valve need to be returned to the duty before oil blocks up, if Preset Time reachesTo after still detect that oil is stifled, prompt system fault shutdown.
In above-mentioned arbitrary technical scheme, preferably, described default duty comprises: described air-conditioningDuty, described air-conditioning that the duty that system defrost starts, described air-conditioning system defrost finishDuty and the described air-conditioning system of system in low-temperature heating operates in lower than default environment temperatureDuty; And the difference of described exhaust pressure value and described back pressure value is absolute value; InstituteStating combustible refrigerant is R290 cold-producing medium.
In this technical scheme, easily there is the stifled default duty of oil and include but not limited in air-conditioning system:The duty that air-conditioning system defrost starts, duty, the air-conditioning system that air-conditioning system defrost finishesDuty and air-conditioning system in start in low-temperature heating operate in lower than default environment temperature(such as ,-15 DEG C) duty, wherein, defrost finishes, defrost starts and low-temperature heatingDuty under air-conditioning system occur oil stifled probability reduce successively, generally speaking, when cold-producing medium existsWhile meeting with the system environments that differs 30 DEG C of above temperature differences in air-conditioning system, just there will be oil stifled,And in the time operating in subzero environment below 15 DEG C, also can block up by oil, certainly oily in the time of subzero 30 DEG CStifled, in addition, when air-conditioning system is during in frequency conversion, severe, high operating mode or cryogenic refrigeration, also existThe situation that oil is stifled.
And for how judging that whether air-conditioning system is in default duty, particularly, when air-conditioning systemWhen the postrun accumulative total of the cross valve start switching times of system is even number time, can determine air-conditioning system placeThe duty finishing in defrost, when accumulative total switching times is while being odd number time, can determine air-conditioning soSystem starts or is in the duty in defrost process in defrost, and is operated in low-temperature heatingDuty can be definite according to start parameters, and environment temperature can be passed through air-conditioning system particularlyExisting temperature sensor detects; In addition, for the exhaust pressure value of the exhaust ports of compressor with returnThe difference of the back pressure value at gas port place takes absolute value, to close by judgement and the size of preset pressure valueIt is stifled that system accurately determines whether air-conditioning system oil occurs, and combustible refrigerant be preferably low GWP,Almost do not have R290 (the being propane) cold-producing medium of any pollution.
Fig. 2 shows the frame of the stifled checkout gear of air-conditioning system oil according to an embodiment of the inventionFigure.
As shown in Figure 2, the stifled checkout gear of air-conditioning system oil according to an embodiment of the invention200, the cold-producing medium that described air-conditioning system is used is combustible refrigerant, and described device 200 comprises:Judge module 202, the first pressure detecting module 204, the second pressure detecting module 206 and definite mouldPiece 208.
Wherein, judge module 202, for judging that whether described air-conditioning system is in default duty;The first pressure detecting module 204, for judge at described judge module 202 described air-conditioning system inWhen described default duty, detect the row of the compressor of described air-conditioning system every the first Preset TimeThe exhaust pressure value at gas port place; The second pressure detecting module 206, at described judge module 202Judge that described air-conditioning system is in the time of described default duty, detect every described the first Preset TimeThe back pressure value at the gas returning port place of the compressor of described air-conditioning system; Described judge module 202 is also usedIn: judge the described exhaust pressure value and described second that described the first pressure detecting module 204 detectsWhether the difference of the described back pressure value that pressure detecting module 206 detects is less than or equal to default pressurePower value; Determination module 208, for determining described sky according to the judged result of described judge module 202It is stifled whether adjusting system there is oil.
The stifled checkout gear 200 of air-conditioning system oil that the embodiment of second aspect present invention provides, when logicalCross the air-conditioning system of judge module 202 judgement use combustible refrigerants in stifled the presetting of easy generation oilWhen duty, need start detection strategy to determine whether air-conditioning system oil occurs stifled, and then keep awayExempt from air-conditioning system because of the stifled phenomenon that occurs ability decay of oil, to ensure the use of compressor and air-conditioning systemLife-span, improve the comfort of air-conditioning system simultaneously, experience thereby promote user, particularly, canTo pass through respectively the first pressure detecting module 204 and the second pressure detecting module every the first Preset Time206 detect the exhaust pressure value of exhaust ports and the gas returning port place of compressor of the compressor of air-conditioning systemBack pressure value, and and then the exhaust that detects according to judge module 202 by determination module 208Whether the difference of force value and back pressure value and the magnitude relationship of preset pressure value determine air-conditioning systemThere is oil stifled.
In addition, the stifled checkout gear 200 of air-conditioning system oil in above-described embodiment provided by the invention,Can also there is following additional technical feature:
In technique scheme, preferably, described in described the first pressure detecting module 204 is arranged onThe exhaust ports of compressor; Described the second pressure detecting module 206 is arranged on the return-air of described compressorMouth place.
In this technical scheme, by be arranged on air-conditioning system compressor exhaust ports first pressPower detection module 204 and to be arranged on the second pressure detecting module 206 at gas returning port place of compressor everyDetect the force value of corresponding position every the first Preset Time, wherein, the first pressure detecting module 204With the second pressure detecting module 206 can be preferably pressure sensor, so, can effectively carryThe accuracy of high pressure values testing result.
In above-mentioned arbitrary technical scheme, preferably, also comprise: statistical module 210, in instituteState the first pressure detecting module 204 and described the second pressure detecting module 206 respectively every described firstPreset Time detects exhaust pressure value and the described compression of the exhaust ports of the compressor of described air-conditioning systemBefore the back pressure value at the gas returning port place of machine, add up described air-conditioning system in described default work shapeThe accumulative total working time of state; Described the first pressure detecting module 204 specifically for: when described statistics mouldThe described accumulative total working time that piece 210 is added up is while reaching the second Preset Time, default every described firstExhaust pressure value described in time detecting; Described the second pressure detecting module 206 specifically for: when describedStatistical module 210 is added up when the described accumulative total working time reaches described the second Preset Time, Mei GesuoState the first Preset Time and detect described back pressure value.
In this technical scheme, in order further to improve the accuracy of force value testing result, can work asThe accumulative total working time that the air-conditioning system of adding up by statistical module 210 is moved under default dutyReach after the second Preset Time, then carry out every the first Preset Time respectively by the first pressure detecting mouldPiece 204 and the second pressure detecting module 206 detect the exhaust of the exhaust ports of the compressor of air-conditioning systemThe operation of the back pressure value at force value and gas returning port place, after the pressure level-off of air-conditioning systemCarry out again the detection of force value.
In above-mentioned arbitrary technical scheme, preferably, described determination module 208 specifically for: work as instituteState judge module 202 and judge that the difference of described exhaust pressure value and described back pressure value is less than or equal toWhen described preset pressure value, determine that oil occurs described air-conditioning system stifled.
In this technical scheme, when judging every the first Preset Time and detect by judge module 202The difference of the back pressure value at the exhaust pressure value of the exhaust ports of compressor and gas returning port place be less than or etc.In the time of preset pressure value, can determine that oil has occurred air-conditioning system by determination module 208 stifled, enterOne step can take corresponding processing policy to solve the stifled problem of oil, to avoid air-conditioning system to occur because oil is stifledThe phenomenon of ability decay in the service life of guarantee compressor and air-conditioning system, improves air-conditioning system simultaneouslyComfort, thereby promote user experience.
In above-mentioned arbitrary technical scheme, preferably, described default duty comprises: described air-conditioningDuty, described air-conditioning that the duty that system defrost starts, described air-conditioning system defrost finishDuty and the described air-conditioning system of system in low-temperature heating operates in lower than default environment temperatureDuty; And the difference of described exhaust pressure value and described back pressure value is absolute value; InstituteStating combustible refrigerant is R290 cold-producing medium.
In this technical scheme, easily there is the stifled default duty of oil and include but not limited in air-conditioning system:The duty that air-conditioning system defrost starts, duty, the air-conditioning system that air-conditioning system defrost finishesDuty and air-conditioning system in start in low-temperature heating operate in lower than default environment temperatureDuty, wherein, defrost finishes, defrost starts and the duty of low-temperature heating under air-conditioningThere is the stifled probability of oil and reduce successively in system, generally speaking, and when cold-producing medium meets with phase in air-conditioning systemWhile differing from the system environments of 30 DEG C of above temperature differences, just there will be oil stifled, and operate in subzeroWhen 15 DEG C of following environment, also can oil stifled, in the time of subzero 30 DEG C, oil be stifled certainly, in addition, works as air-conditioningIn the time of frequency conversion, severe, high operating mode or cryogenic refrigeration, also there is the stifled situation of oil in system.
And for how judging that air-conditioning system is whether in default duty, particularly, when by sentencingThe postrun accumulative total of the cross valve start switching times that disconnected module 202 is judged air-conditioning system is during as even number time,Can determine the duty that air-conditioning system finishes in defrost, so when sentencing by judge module 202Surely, when to add up switching times be odd number time, can determine that air-conditioning system starts or being in defrostThe duty of frost in process, and the duty that is operated in low-temperature heating can be passed through judge module202 determine according to start parameters, and environment temperature can be by judge module 202 by empty particularlyThe testing result of the existing temperature sensor of adjusting system is determined; In addition, for the exhaust ports of compressorExhaust pressure value and the difference of the back pressure value at gas returning port place take absolute value, with by judgement with pre-If it is stifled that the magnitude relationship of force value accurately determines whether air-conditioning system oil occurs, and combustible refrigerant is excellentSelection of land is low GWP, the R290 that does not almost have any pollution (being propane) cold-producing medium.
Fig. 3 shows the block diagram of air-conditioner according to an embodiment of the invention.
As shown in Figure 3, air-conditioner 300 according to an embodiment of the invention, comprises above-mentioned secondThe stifled checkout gear 200 of air-conditioning system oil in aspect embodiment described in any one.
The air-conditioner 300 that the embodiment of third aspect present invention provides, real because comprising above-mentioned second aspectExecute the stifled checkout gear 200 of the oil of the air-conditioning system described in any one in example, thereby can be timely and effectivelyDetermine and use the air-conditioning system of combustible refrigerant whether oily blocking up occurs, and then avoid air-conditioning system because of oilThe stifled phenomenon that occurs ability decay to ensure the service life of compressor and air-conditioning system, improves simultaneouslyThe comfort of air-conditioning system, promotes user and experiences.
More than be described with reference to the accompanying drawings technical scheme of the present invention, can determined and make timely and effectivelyWhether there is oil by the air-conditioning system of combustible refrigerant stifled, and then avoid air-conditioning system to occur because oil is stifledThe phenomenon of ability decay to ensure the service life of compressor and air-conditioning system, improves air-conditioning system simultaneouslyThe comfort of system, promotes user and experiences, simultaneously also for studying from now on new type compressor lubricating oil moreGood coupling new cooling media provides a kind of reference frame.
In the present invention, the only object for describing of term " first ", " second ", and can not be interpreted asInstruction or hint relative importance. For the ordinary skill in the art, can be according to specificallySituation is understood above-mentioned term concrete meaning in the present invention.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, forThose skilled in the art, the present invention can have various modifications and variations. All in essence of the present inventionWithin god and principle, any amendment of doing, be equal to replacement, improvement etc., all should be included in the present inventionProtection domain within.
Claims (11)
1. the stifled detection method of air-conditioning system oil, is characterized in that, described air-conditioning system is usedCold-producing medium be combustible refrigerant, described method comprises:
Judge that whether described air-conditioning system is in default duty;
In the time judging described air-conditioning system in described default duty, divide every the first Preset TimeDo not detect the exhaust pressure value of exhaust ports and the returning of described compressor of the compressor of described air-conditioning systemThe back pressure value at gas port place;
Whether the difference that judges described exhaust pressure value and described back pressure value is less than or equal to default pressurePower value;
Determine according to judged result whether described air-conditioning system oil occurs stifled.
2. the stifled detection method of air-conditioning system oil according to claim 1, is characterized in that,By being arranged on the first pressure detecting module of exhaust ports and the returning of described compressor of described compressorThe second pressure detecting module at gas port place detects respectively described pressure at expulsion every described the first Preset TimeValue and described back pressure value.
3. the stifled detection method of air-conditioning system oil according to claim 1, is characterized in that,The described row who detects respectively the exhaust ports of the compressor of described air-conditioning system every the first Preset TimeBefore the back pressure value at the gas returning port place of atmospheric pressure value and described compressor, also comprise:
Add up the accumulative total working time of described air-conditioning system in described default duty;
In the time that the described accumulative total working time reaches the second Preset Time, divide every described the first Preset TimeDo not detect described exhaust pressure value and described back pressure value.
4. the detection method stifled according to the air-conditioning system oil described in any one in claims 1 to 3,It is characterized in that, described to determine according to judged result whether described air-conditioning system oil occurs stifled, specifically bagDraw together: described default when judging that the difference of described exhaust pressure value and described back pressure value is less than or equal toWhen force value, determine that oil occurs described air-conditioning system stifled.
5. the detection method stifled according to the air-conditioning system oil described in any one in claims 1 to 3,It is characterized in that,
Described default duty comprises: the duty that described air-conditioning system defrost starts, described skyDuty in low-temperature heating of the duty that adjusting system defrost finishes, described air-conditioning system andDescribed air-conditioning system operates in the duty lower than default environment temperature; And
The difference of described exhaust pressure value and described back pressure value is absolute value;
Described combustible refrigerant is R290 cold-producing medium.
6. the stifled checkout gear of air-conditioning system oil, is characterized in that, described air-conditioning system is usedCold-producing medium be combustible refrigerant, described device comprises:
Judge module, for judging that whether described air-conditioning system is in default duty;
The first pressure detecting module, for judging that at described judge module described air-conditioning system is in describedWhen default duty, detect the exhaust outlet of the compressor of described air-conditioning system every the first Preset TimeThe exhaust pressure value at place;
The second pressure detecting module, for judging that at described judge module described air-conditioning system is in describedWhen default duty, detect the returning of compressor of described air-conditioning system every described the first Preset TimeThe back pressure value at gas port place;
Described judge module also for: judge the described exhaust that described the first pressure detecting module detectsWhether the difference of the described back pressure value that force value and described the second pressure detecting module detect is less thanOr equal preset pressure value;
Whether determination module, for determining described air-conditioning system according to the judged result of described judge moduleThere is oil stifled.
7. the stifled checkout gear of air-conditioning system oil according to claim 6, is characterized in that,
Described the first pressure detecting module is arranged on the exhaust ports of described compressor;
Described the second pressure detecting module is arranged on the gas returning port place of described compressor.
8. the stifled checkout gear of air-conditioning system oil according to claim 6, is characterized in that,Also comprise:
Statistical module, for dividing in described the first pressure detecting module and described the second pressure detecting moduleDo not detect the exhaust pressure of the exhaust ports of the compressor of described air-conditioning system every described the first Preset TimeBefore the back pressure value at the gas returning port place of power value and described compressor, add up described air-conditioning system inThe accumulative total working time of described default duty;
Described the first pressure detecting module specifically for: when the described accumulative total work of described statistical module countsWhile reaching the second Preset Time as the time, detect described exhaust pressure value every described the first Preset Time;
Described the second pressure detecting module specifically for: when the described accumulative total work of described statistical module countsWhile reaching described the second Preset Time as the time, detect described return-air every described the first Preset Time and pressPower value.
9. the checkout gear stifled according to the air-conditioning system oil described in any one in claim 6 to 8,It is characterized in that, described determination module specifically for:
Judge that the difference of described exhaust pressure value and described back pressure value is less than when described judge module orWhile equaling described preset pressure value, determine that oil occurs described air-conditioning system stifled.
10. the checkout gear stifled according to the air-conditioning system oil described in any one in claim 6 to 8,It is characterized in that,
Described default duty comprises: the duty that described air-conditioning system defrost starts, described skyDuty in low-temperature heating of the duty that adjusting system defrost finishes, described air-conditioning system andDescribed air-conditioning system operates in the duty lower than default environment temperature; And
The difference of described exhaust pressure value and described back pressure value is absolute value;
Described combustible refrigerant is R290 cold-producing medium.
11. 1 kinds of air-conditioners, is characterized in that, comprise as any one institute in claim 6 to 10The stifled checkout gear of air-conditioning system oil of stating.
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