CN104456859A - Air conditioner and defrosting control method and device thereof - Google Patents
Air conditioner and defrosting control method and device thereof Download PDFInfo
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- CN104456859A CN104456859A CN201310416593.5A CN201310416593A CN104456859A CN 104456859 A CN104456859 A CN 104456859A CN 201310416593 A CN201310416593 A CN 201310416593A CN 104456859 A CN104456859 A CN 104456859A
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- 238000010257 thawing Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 84
- 238000004364 calculation method Methods 0.000 claims description 29
- 238000005057 refrigeration Methods 0.000 claims description 18
- 230000009467 reduction Effects 0.000 claims description 16
- 230000002045 lasting effect Effects 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and a defrosting control method and device thereof. The defrosting control method of the air conditioner comprises the following steps: detecting the heating operation current of an outdoor unit motor of the air conditioner in real time in the heating operation mode of the air conditioner; calculating the thickness of a frost layer of an outdoor heat exchanger of the air conditioner according to the heating operation current; judging whether the thickness of the frost layer is larger than a first preset thickness; and controlling the air conditioner to enter defrosting operation under the condition that the thickness of the frost layer is larger than the first preset thickness. According to the invention, the problem of low accuracy of the defrosting control method of the air conditioner in the prior art is solved, and the effect of improving the defrosting accuracy of the air conditioner is further achieved.
Description
Technical field
The present invention relates to air-conditioner field, in particular to a kind of air-conditioner and defrosting control method thereof and device.
Background technology
The automatic defrosting technology of Wind-cooling type heat pump air conditioner unit when heating operation, more and more ripe, occur the Defrost technology of much novel intelligence, but all there is the defect of self in a lot of technology.
A kind of method utilizing the change of outdoor DC fan electric current to defrost to air-conditioner is disclosed in prior art, this Defrost method calculates difference judge with the current maxima detected, minimum of a value, along with the accumulation of unit operation time, the serious laying dust in heat exchanger side and weathering etc. cause all changing of the resistance of heat exchanger own, above-mentioned Defrost method still judges with initial current differential, accuracy reduces greatly, the advantage of the program will become inferior position, causes the waste of unit erroneous judgement and the energy.
For the problem that the defrosting control method accuracy of air-conditioner in correlation technique is low, at present effective solution is not yet proposed.
Summary of the invention
Main purpose of the present invention is to provide a kind of air-conditioner and defrosting control method thereof and device, with the problem that the defrosting control method accuracy solving air-conditioner in prior art is low.
To achieve these goals, according to an aspect of the present invention, a kind of defrosting control method of air-conditioner is provided, it is characterized in that, comprise: under air conditioner heat-production operational mode, detect the running current of air-conditioner outdoor unit motor in real time, obtain the first heating operation electric current; According to the frost thickness of the first heating operation Current calculation air conditioner chamber external heat exchanger; Judge whether the frost thickness calculated according to the first heating operation galvanometer is greater than the first preset thickness; And when judging that the frost thickness calculated according to the first heating operation galvanometer is greater than the first preset thickness, controlling air-conditioner and entering Defrost operation.
Further, after control air-conditioner enters Defrost operation, defrosting control method also comprises: under air-conditioner Defrost operation pattern, the pipe temperature of real-time sensing chamber external heat exchanger and the running current of motor, obtains heat exchanger tube temperature and the second heating operation electric current; According to the frost thickness of the second heating operation Current calculation outdoor heat exchanger; Judge whether the frost thickness calculated according to the second heating operation galvanometer is less than the second preset thickness, and judge whether heat exchanger tube temperature is greater than preset temperature, wherein, the first preset thickness is greater than the second preset thickness; And judging that the frost thickness calculated according to the second heating operation galvanometer is less than the second preset thickness, and when heat exchanger tube temperature is greater than preset temperature, controls air-conditioner and exit Defrost operation.
Further, frost thickness according to the first heating operation electric current or the second heating operation Current calculation outdoor heat exchanger comprises: according to the pressure difference value of the first heating operation electric current or the second heating operation Current calculation outdoor heat exchanger both sides air, air pressure difference when obtaining heating; And calculate frost thickness according to air pressure difference when heating.
Further, defrosting control method also comprises: judge whether air-conditioner is in lasting refrigeration mode; And when judging that air-conditioner is in lasting refrigeration mode, revise the pressure reduction of outdoor heat exchanger.
Further, judge whether air-conditioner is in lasting refrigeration mode and comprises: under air-conditioner cooling operation mode, obtain total number of run and the refrigerating operaton number of times of air-conditioner; Calculate the ratio of refrigerating operaton number of times and total number of run; And judge whether the ratio calculated is more than or equal to preset value, wherein, when the ratio judging to calculate is more than or equal to preset value, determines that air-conditioner is in lasting refrigeration mode.
Further, the pressure reduction revising outdoor heat exchanger comprises: under air-conditioner cooling operation mode, detects the running current of air-conditioner outdoor unit motor in real time, obtains refrigerating operaton electric current; Calculate the pressure difference value of the outdoor heat exchanger both sides corresponding with refrigerating operaton electric current, air pressure difference when obtaining freezing; And determine that the frost thickness corresponding with air pressure difference during refrigeration is zero.
To achieve these goals, according to a further aspect in the invention, a kind of defrost control device of air-conditioner is provided, comprise: the first detecting unit, for under air conditioner heat-production operational mode, detect the running current of air-conditioner outdoor unit motor in real time, obtain the first heating operation electric current; First computing unit, for the frost thickness according to the first heating operation Current calculation air conditioner chamber external heat exchanger; First judging unit, for judging whether the frost thickness calculated according to the first heating operation galvanometer is greater than the first preset thickness; And first control unit, for when judging that the frost thickness calculated according to the first heating operation galvanometer is greater than the first preset thickness, controlling air-conditioner and entering Defrost operation.
Further, defrost control device also comprises: the second detecting unit, and under air-conditioner Defrost operation pattern, the pipe temperature of real-time sensing chamber external heat exchanger and the running current of motor, obtain heat exchanger tube temperature and the second heating operation electric current; Second computing unit, for the frost thickness according to the second heating operation Current calculation outdoor heat exchanger; Second judging unit, for judging whether the frost thickness calculated according to the second heating operation galvanometer is less than the second preset thickness, and judge whether heat exchanger tube temperature is greater than preset temperature, wherein, the first preset thickness is greater than the second preset thickness; And second control unit, for judging that the frost thickness calculated according to the second heating operation galvanometer is less than the second preset thickness, and when heat exchanger tube temperature is greater than preset temperature, controlling air-conditioner and exiting Defrost operation.
Further, the first detecting unit comprises the first current detector, and the second detecting unit comprises the second current detector and temperature sensor.
Further, on temperature sensor heat exchanger disposed in the outdoor, and be arranged on below the first horizontal plane, wherein, the distance between outdoor heat exchanger upper surface and the first horizontal plane equals the distance between outdoor heat exchanger lower surface and the first horizontal plane.
To achieve these goals, according to a further aspect in the invention, provide a kind of air-conditioner, comprise the defrost control device of any one air-conditioner that foregoing of the present invention provides.
The present invention adopts under air conditioner heat-production operational mode, detects the heating operation electric current of air-conditioner outdoor unit motor in real time; According to the frost thickness of heating operation Current calculation air conditioner chamber external heat exchanger; Judge whether frost thickness is greater than the first preset thickness; And when judging that frost thickness is greater than the first preset thickness, controlling air-conditioner and entering Defrost operation.Running current due to direct current generator is that input power is through over commutation, SPM (IntelligentPower Module, be called for short IPM) export the phase current of direct current generator to after process, this running current when the same running frequency of direct current generator and running load, not by the impact of power supply input voltage fluctuation.In air-conditioner running, the direct current generator load change that frosting or defrosting can cause, the running current of direct current generator is caused to change further, known based on foregoing description, the running current of direct current generator is not by the impact of other factors, therefore, the frost thickness of outdoor heat exchanger can be determined by the running current of direct current generator in air-conditioner, and then when frost thickness acquires a certain degree, control air-conditioner Defrost operation, based on the Defrost mode of current differential in this kind of Defrost mode hinge structure, the degree of accuracy is higher, solve the problem that the defrosting control method accuracy of air-conditioner in prior art is low, and then reach the effect improving the air-conditioner defrosting degree of accuracy.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the defrost control device of air-conditioner according to the embodiment of the present invention;
Fig. 2 is the defrosting schematic diagram of defrost control device in Fig. 1;
Fig. 3 is the flow chart of the defrosting control method of air-conditioner according to the embodiment of the present invention;
Fig. 4 is the decision flowchart entering defrosting according to the defrosting control method of the air-conditioner of the embodiment of the present invention;
Fig. 5 is the decision flowchart exiting defrosting according to the defrosting control method of the air-conditioner of the embodiment of the present invention; And
Fig. 6 is the flow chart carrying out the correction of heat exchanger pressure reduction according to the defrosting control method of the air-conditioner of the embodiment of the present invention.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Embodiments provide a kind of defrost control device of air-conditioner, below the defrost control device that the embodiment of the present invention provides is specifically introduced;
Fig. 1 is the schematic diagram of the defrost control device of air-conditioner according to the embodiment of the present invention, and as shown in Figure 1, this defrost control device mainly comprises the first detecting unit 10, first computing unit 20, first judging unit 30 and the first control unit 40, particularly:
First detecting unit 10 is under air conditioner heat-production operational mode, the running current of real-time detection air-conditioner outdoor unit motor, obtains the first heating operation electric current, particularly, first detecting unit 10 can be current transformer, also can be that other can carry out the device of current detecting.
First computing unit 20 is for the frost thickness according to the first heating operation Current calculation air conditioner chamber external heat exchanger, particularly, first computing unit 20 can first according to the pressure difference value △ P of the first heating operation Current calculation outdoor heat exchanger both sides air, obtain heating pressure reduction, then according to the frost thickness heating pressure reduction calculating outdoor heat exchanger, concrete account form is as follows:
First, calculate the pressure difference value △ P corresponding with electric current I according to formula △ P=k1*I, wherein, k1 is predetermined coefficient, and this coefficient is determined by the concrete specification of air-conditioner;
Then, according to formula
calculate the frost thickness D corresponding with pressure difference value △ P, wherein, △ P represents heat exchanger air side pressure reduction; D represents heat exchanger surface frost thickness; λ represents constant; N represent be not 1 natural number, k2 is similarly the predetermined coefficient determined by the concrete specification of air-conditioner.
First judging unit 30 is for judging whether the frost thickness calculated according to the first heating operation galvanometer is greater than the first preset thickness D1.
First control unit 40, for when judging that the frost thickness calculated according to the first heating operation galvanometer is greater than the first preset thickness D1, controlling air-conditioner and entering Defrost operation.
Running current due to direct current generator is that input power is through over commutation, SPM (Intelligent PowerModule, be called for short IPM) export the phase current of direct current generator to after process, this running current when the same running frequency of direct current generator and running load, not by the impact of power supply input voltage fluctuation.In air-conditioner running, the direct current generator load change that frosting or defrosting can cause, the running current of direct current generator is caused to change further, known based on foregoing description, the running current of direct current generator is not by the impact of other factors, therefore, the defrost control device of the air-conditioner that the embodiment of the present invention provides can determine the frost thickness of outdoor heat exchanger by running current, and then when frost thickness acquires a certain degree, control air-conditioner Defrost operation, this kind carries out the scheme of defrost control based on frost thickness, can ensure that outdoor heat exchanger enters the opportunity of defrosting just in time, based on the Defrost mode of current differential in Defrost mode hinge structure, the degree of accuracy is higher, solve the problem that the defrosting control method accuracy of air-conditioner in prior art is low, and then reach the effect improving the air-conditioner defrosting degree of accuracy.
Further, defrost control device also comprises the second detecting unit, the second computing unit, the second judging unit and the second control unit, particularly:
Second detecting unit is used under air-conditioner Defrost operation pattern, the pipe temperature of real-time sensing chamber external heat exchanger and the running current of motor, obtain heat exchanger tube temperature T and the second heating operation electric current, particularly, second detecting unit comprises the device cell carrying out current detecting, it can be current transformer, also can be that other can carry out the device of current detecting, the device cell carrying out temperature detection can also be comprised, can be temperature sensor, also can be that other can carry out the device of temperature detection.
Second computing unit is used for the frost thickness according to the second heating operation Current calculation outdoor heat exchanger, and concrete account form is identical with the account form of above-mentioned first computing unit, repeats no more herein.
Second judging unit for judging whether the frost thickness calculated according to the second heating operation galvanometer is less than the second preset thickness D2, and judges whether heat exchanger tube temperature T is greater than preset temperature T1, and wherein, the first preset thickness D1 is greater than the second preset thickness D2.
Second control unit be used for judging that the frost thickness calculated according to the second heating operation galvanometer is less than the second preset thickness D2, and heat exchanger tube temperature T be greater than preset temperature he when, control air-conditioner exit Defrost operation.
The defrost control device of the embodiment of the present invention, frost thickness when detecting air-conditioner Defrost operation by the second detecting unit and the heat exchanger tube temperature of outdoor heat exchanger, heat exchanger tube temperature based on frost thickness and outdoor heat exchanger is carried out defrosting and is exited the scheme of control, achieve when ensureing that unit defrosting is clean, timely control air-conditioner exits Defrost operation, achieve the defrosting time shortening air-conditioner, control air-conditioner within the shortest time, reach the clean nothing remnants of defrosting.
Preferably, carry out on device (as the temperature sensor) heat exchanger disposed in the outdoor of temperature detection in second detecting unit, and be arranged on below the first horizontal plane, wherein, distance between outdoor heat exchanger upper surface and the first horizontal plane equals the distance between outdoor heat exchanger lower surface and the first horizontal plane, that is, the middle and lower part of temperature detection device heat exchanger disposed in the outdoor.
In outdoor heat exchanger defrost process, frost layer is melted normally from top to bottom, middle and lower part usually last just defrosting is clean, by temperature detection device being arranged at the middle and lower part of outdoor heat exchanger, namely be temperature detection device is arranged on the clean position of the most difficult defrosting of heat exchanger, reach and avoid defrosting clean and occur icing drawback.
It should be noted that, current sensing device in current sensing device in first detecting unit and the second detecting unit can be same current sensing device, also can be different current sensing device, first control unit and the second control unit can be same control unit, also can be different control units.First computing unit, the second computing unit, the first judging unit and the second judging unit are too.First control unit, the second control unit, the first computing unit, the second computing unit, the first judging unit and the second judging unit also can be integrated into same control device.
The defrost control device diagrammatically illustrating the application embodiment of the present invention in Fig. 2 carries out the schematic diagram of defrost control, wherein, in Fig. 2, current detecting unit comprises the current sensing device in the first detecting unit and the current sensing device in the second detecting unit, and main control unit comprises the first control unit, the second control unit, the first computing unit, the second computing unit, the first judging unit and the second judging unit.The principle of carrying out defrost control is:
At air conditioner heat-production run duration, the running current of outdoor motor 46 is converted to AD signal by the current detecting unit 45 be made up of current transformer and sends to main control unit 44, main control unit 44 is by the analytical calculation to data, and judge, then corresponding (heating operation or Defrost operation) fill order is sent to outdoor fan 46 and other executing agency's (cross valves, compressor etc.) 43, if meet defrosting entry condition, then main control unit 44 sends Defrost operation fill order to each executing agency, air-conditioner enters Defrost operation, otherwise continuation heating operation, during air-conditioner Defrost operation, the running current of outdoor motor 46 is converted to AD signal by the current detecting unit 45 be made up of current transformer and sends to main control unit 44, simultaneously, heat exchanger tube temperature transition is that AD signal sends to main control unit 44 by the temperature sensor 42 of outdoor heat exchanger 41 middle and lower part, main control unit 44 is by the analytical calculation to data, and judge, then corresponding (heating operation or Defrost operation) fill order is sent to outdoor fan 46 and other executing agency's (cross valves, compressor etc.) 43, if meet defrosting exit criteria, the fill order that then main control unit 44 sends heating operation enters heating operation to each executing agency, otherwise continuation Defrost operation.
The embodiment of the present invention additionally provides a kind of defrosting control method of air-conditioner, the defrost control device that this defrosting control method can be provided by embodiment of the present invention foregoing performs, and is specifically introduced below to the defrosting control method that the embodiment of the present invention provides:
Fig. 3 is the flow chart of the defrosting control method according to the embodiment of the present invention, and as shown in Figure 3, this defrosting control method comprises following step S302 to step S308:
S302: under air conditioner heat-production operational mode, first heating operation electric current of real-time detection air-conditioner outdoor unit motor, particularly, can pass through current transformer, the running current of device to motor that also can carry out current detecting by other detects.
S304: according to the frost thickness of the first heating operation Current calculation air conditioner chamber external heat exchanger, particularly, as shown in Figure 4, frost thickness according to the first heating operation Current calculation air conditioner chamber external heat exchanger mainly comprises: first according to the pressure difference value △ P of the first heating operation Current calculation outdoor heat exchanger both sides air, air pressure difference when obtaining heating, then according to the frost thickness of air pressure difference counting chamber external heat exchanger when heating.
S306: judge whether the frost thickness calculated according to the first heating operation galvanometer is greater than the first preset thickness D1.
S308: when judging that the frost thickness calculated according to the first heating operation galvanometer is greater than the first preset thickness, controls air-conditioner and enters Defrost operation.
Running current due to direct current generator is that input power is through over commutation, SPM (Intelligent PowerModule, be called for short IPM) export the phase current of direct current generator to after process, this running current when the same running frequency of direct current generator and running load, not by the impact of power supply input voltage fluctuation.In air-conditioner running, the direct current generator load change that frosting or defrosting can cause, the running current of direct current generator is caused to change further, known based on foregoing description, the running current of direct current generator is not by the impact of other factors, therefore, the defrost control device of the air-conditioner that the embodiment of the present invention provides can determine the frost thickness of outdoor heat exchanger by the running current of direct current generator in air-conditioner, and then when frost thickness acquires a certain degree, control air-conditioner Defrost operation, this kind carries out the scheme of defrost control based on frost thickness, can ensure that outdoor heat exchanger enters the opportunity of defrosting just in time, based on the Defrost mode of current differential in Defrost mode hinge structure, the degree of accuracy is higher, solve the problem that the defrosting control method accuracy of air-conditioner in prior art is low, and then reach the effect improving the air-conditioner defrosting degree of accuracy.
Further, as shown in Figure 5, after control air-conditioner enters Defrost operation, the defrosting control method of the embodiment of the present invention also comprises: first, under air-conditioner Defrost operation pattern, the pipe temperature of real-time sensing chamber external heat exchanger and the running current of motor, obtain heat exchanger tube temperature T and the second heating operation electric current, particularly, second detecting unit comprises the device cell carrying out current detecting, it can be current transformer, also can be that other can carry out the device of current detecting, the device cell carrying out temperature detection can also be comprised, it can be temperature sensor, also can be that other can carry out the device of temperature detection.Secondly, according to the frost thickness of the second heating operation Current calculation outdoor heat exchanger, concrete account form is identical with the above-mentioned account form according to the first heating operation Current calculation frost thickness, repeats no more herein.Then, judge whether the frost thickness calculated according to the second heating operation galvanometer is less than the second preset thickness D2, and judge whether heat exchanger tube temperature T is greater than preset temperature T1, wherein, the first preset thickness D1 is greater than the second preset thickness D2.Subsequently, judging that the frost thickness calculated according to the second heating operation galvanometer is less than the second preset thickness, and when heat exchanger tube temperature is greater than preset temperature, is controlling air-conditioner and exit Defrost operation.
The defrosting control method of the embodiment of the present invention, frost thickness when detecting air-conditioner Defrost operation by the second detecting unit and the heat exchanger tube temperature of outdoor heat exchanger, heat exchanger tube temperature based on frost thickness and outdoor heat exchanger is carried out defrosting and is exited the scheme of control, achieve when ensureing that unit defrosting is clean, timely control air-conditioner exits Defrost operation, achieve the defrosting time shortening air-conditioner, control air-conditioner within the shortest time, reach the clean nothing remnants of defrosting.
Preferably, the detection of outdoor heat exchange actuator temperature is mainly detected the part that outdoor heat exchanger is in below the first horizontal plane, wherein, distance between outdoor heat exchanger upper surface and the first horizontal plane equals the distance between outdoor heat exchanger lower surface and the first horizontal plane, that is, the temperature of outdoor heat exchanger middle and lower part is detected.
Because air-cooled heat pump type air-conditioner is when cold district heating operation, the link of frosting and defrosting becomes the key factor of the overall heating effect of restriction air-conditioner, in order to play the maximum heating effect of air-conditioner, will ensure that outdoor heat exchanger defrosts the lucky of entry time each time, and the defrosting defrosted when exiting is clean without remaining, that is, accomplish the defrosting time that air-conditioner is the shortest, and defrosting is clean.For this reason, the defrosting that the above-mentioned defrosting control method of the embodiment of the present invention is formulated enters and exit decision condition nuance: for the judgement entered that defrosts, the frost thickness calculated in the technical scheme of above-described embodiment is the integral thickness (i.e. average thickness) of heat exchanger side frost layer, it directly can embody the influence degree of frost layer heat exchanging effect (and then directly affecting heating effect), judges that best entry time there will not be the problem entering defrosting too early with it, for the judgement exited that defrosts, in the technical scheme of above-described embodiment while use frost thickness, in conjunction with the temperature T that heat exchanger side pipe temperature detector is surveyed, exiting of the two common decision defrosting, because in outdoor heat exchanger defrost process, frost layer is melted usually from top to bottom, middle and lower part usually last just defrosting is clean, the position that in this scheme, pipe temperature detector is surveyed is arranged at the clean position of the most difficult defrosting of heat exchanger, the ability Safe withdrawing Defrost operation when this place Guan Wen reaches setting value T1, ensure that unit defrosting is clean, avoid after the multiple defrosting cycle defrosting not cleared-out problem of now freezing.
Further preferably, the defrosting control method of the embodiment of the present invention also comprises: judge whether air-conditioner is in lasting refrigeration mode, when judging that air-conditioner is in lasting refrigeration mode, revise the pressure reduction of outdoor heat exchanger, in embodiments of the present invention, so-called lasting refrigeration mode refers to that air-conditioner works in season of freezing.
Because heat exchanger has laying dust and aging impact in permanent use procedure, cause the resistance of heat exchanger itself from different at first, the calculating of heat exchanger side air pressure difference Δ P and frost thickness D can be had influence on, by increasing the correction link of heat exchanger side pressure difference, reach the effect ensureing above-mentioned calculating accuracy.Wherein, in order to ensure that unit heat exchanger side pressure difference carries out the process revised, heat exchanger side is without any frost layer, and above-mentioned correction step is carried out in the process of refrigeration season (that is, when air-conditioner is in lasting refrigeration mode) air-conditioner refrigerating operaton.
Particularly, embodiments provide a kind of mode whether air-conditioner is in lasting refrigeration mode that judges: first, under air-conditioner cooling operation mode, obtain total number of run and the refrigerating operaton number of times of air-conditioner, for the acquisition of total number of run and refrigerating operaton number of times, can obtain from the main control chip memory of air-conditioner.Secondly, the ratio of refrigerating operaton number of times and total number of run is calculated.Then, judge whether the ratio calculated is more than or equal to preset value, wherein, when the ratio judging to calculate is more than or equal to preset value, determines that air-conditioner is in lasting refrigeration mode.
The embodiment of the present invention additionally provides a kind of mode revising the pressure reduction of outdoor heat exchanger, as shown in Figure 6: first, under air-conditioner cooling operation mode, detects the running current of air-conditioner outdoor unit motor in real time, obtains refrigerating operaton electric current.Secondly, calculate the pressure reduction of the outdoor heat exchanger corresponding with refrigerating operaton electric current, obtain the pressure reduction that freezes.Then, determine that the frost thickness corresponding with refrigeration pressure reduction is zero.Wherein, calculate the pressure reduction of the outdoor heat exchanger corresponding with refrigerating operaton electric current, identical with the above-mentioned mode according to heating operation Current calculation pressure reduction, repeat no more herein.
In addition, the embodiment of the present invention additionally provides a kind of air-conditioner, this air-conditioner can comprise the air-conditioner of the defrost control device of any one air-conditioner that embodiment of the present invention foregoing provides, and also can be the air-conditioner of the defrosting control method of any one air-conditioner adopting embodiment of the present invention foregoing to provide.
From above description, can find out, present invention achieves following technique effect: under the prerequisite additionally not increasing the sensors such as wind speed, pressure reduction, light, by the service performance of DC fan, survey in conjunction with heat exchanger side pipe temperature detector, accurate judgement is made to the frost thickness of outdoor heat exchange side, realization has white defrost, the intelligent defrosting effect of frostless not defrost, substantially increases and heats comfortableness, reduces the waste of the energy.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a defrosting control method for air-conditioner, is characterized in that, comprising:
Under described air conditioner heat-production operational mode, detect the running current of described air-conditioner outdoor unit motor in real time, obtain the first heating operation electric current;
The frost thickness of air conditioner chamber's external heat exchanger according to described first heating operation Current calculation;
Judge whether the described frost thickness calculated according to described first heating operation galvanometer is greater than the first preset thickness; And
When judging that the described frost thickness calculated according to described first heating operation galvanometer is greater than described first preset thickness, controlling described air-conditioner and entering Defrost operation.
2. defrosting control method according to claim 1, is characterized in that, after the described air-conditioner of control enters Defrost operation, described defrosting control method also comprises:
Under described air-conditioner Defrost operation pattern, detect the pipe temperature of described outdoor heat exchanger and the running current of described motor in real time, obtain heat exchanger tube temperature and the second heating operation electric current;
The frost thickness of outdoor heat exchanger according to described second heating operation Current calculation;
Judge whether the described frost thickness calculated according to described second heating operation galvanometer is less than the second preset thickness, and judge whether described heat exchanger tube temperature is greater than preset temperature, wherein, described first preset thickness is greater than described second preset thickness; And
Judging that the described frost thickness calculated according to described second heating operation galvanometer is less than described second preset thickness, and when described heat exchanger tube temperature is greater than described preset temperature, is controlling described air-conditioner and exit Defrost operation.
3. defrosting control method according to claim 2, is characterized in that, according to described first heating operation electric current or described second heating operation Current calculation, the frost thickness of outdoor heat exchanger comprises:
The pressure difference value of outdoor heat exchanger both sides air according to described first heating operation electric current or described second heating operation Current calculation, air pressure difference when obtaining heating; And
Described frost thickness is calculated according to air pressure difference during described heating.
4. defrosting control method according to claim 3, is characterized in that, described defrosting control method also comprises:
Judge whether described air-conditioner is in lasting refrigeration mode; And
When judging that described air-conditioner is in described lasting refrigeration mode, revise the pressure reduction of described outdoor heat exchanger.
5. defrosting control method according to claim 4, is characterized in that, judges whether described air-conditioner is in lasting refrigeration mode and comprises:
Under described air-conditioner cooling operation mode, obtain total number of run and the refrigerating operaton number of times of described air-conditioner;
Calculate the ratio of described refrigerating operaton number of times and described total number of run; And
Judge whether the ratio calculated is more than or equal to preset value,
Wherein, when the ratio judging to calculate is more than or equal to described preset value, determine that described air-conditioner is in described lasting refrigeration mode.
6. defrosting control method according to claim 4, is characterized in that, the pressure reduction revising described outdoor heat exchanger comprises:
Under described air-conditioner cooling operation mode, detect the running current of described air-conditioner outdoor unit motor in real time, obtain refrigerating operaton electric current;
Calculate the pressure difference value of the described outdoor heat exchanger both sides air corresponding with described refrigerating operaton electric current, air pressure difference when obtaining freezing; And
Determine that the frost thickness corresponding with air pressure difference during described refrigeration is zero.
7. a defrost control device for air-conditioner, is characterized in that, comprising:
First detecting unit, under described air conditioner heat-production operational mode, detects the running current of the off-premises station motor of described air-conditioner in real time, obtains the first heating operation electric current;
First computing unit, for the frost thickness of air conditioner chamber's external heat exchanger according to described first heating operation Current calculation;
First judging unit, for judging whether the described frost thickness calculated according to described first heating operation galvanometer is greater than the first preset thickness; And
First control unit, for when judging that the described frost thickness calculated according to described first heating operation galvanometer is greater than described first preset thickness, controlling described air-conditioner and entering Defrost operation.
8. defrost control device according to claim 7, is characterized in that, described defrost control device also comprises:
Second detecting unit, under described air-conditioner Defrost operation pattern, detects the pipe temperature of described outdoor heat exchanger and the running current of described motor in real time, obtains heat exchanger tube temperature and the second heating operation electric current;
Second computing unit, for the frost thickness of outdoor heat exchanger according to described second heating operation Current calculation;
Second judging unit, for judging whether the described frost thickness calculated according to described second heating operation galvanometer is less than the second preset thickness, and judge whether described heat exchanger tube temperature is greater than preset temperature, wherein, described first preset thickness is greater than described second preset thickness; And
Second control unit, for judging that the described frost thickness calculated according to described second heating operation galvanometer is less than described second preset thickness, and when described heat exchanger tube temperature is greater than described preset temperature, controls described air-conditioner and exit Defrost operation.
9. defrost control device according to claim 8, is characterized in that,
Described first detecting unit comprises the first current detector,
Described second detecting unit comprises the second current detector and temperature sensor.
10. defrost control device according to claim 9, it is characterized in that, described temperature sensor is arranged on described outdoor heat exchanger, and be arranged on below the first horizontal plane, wherein, the distance between described outdoor heat exchanger upper surface and described first horizontal plane equals the distance between described outdoor heat exchanger lower surface and described first horizontal plane.
11. 1 kinds of air-conditioners, is characterized in that, comprise the defrost control device of the air-conditioner according to any one of claim 7 to 10.
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