CN104596032B - Air conditioner and its defrosting control method - Google Patents
Air conditioner and its defrosting control method Download PDFInfo
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- CN104596032B CN104596032B CN201410855418.0A CN201410855418A CN104596032B CN 104596032 B CN104596032 B CN 104596032B CN 201410855418 A CN201410855418 A CN 201410855418A CN 104596032 B CN104596032 B CN 104596032B
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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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—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 a kind of defrosting control method of air conditioner, the control method comprises the following steps：Obtain environment temperature and the temperature or the temperature of super cooled sect of outdoor heat exchanger outlet；The temperature or the temperature of super cooled sect exported according to environment temperature and outdoor heat exchanger judges whether to meet defrosting condition；And when judging to meet defrosting condition, the wind speed and control electric expansion valve for reducing indoor fan are turned down to the first aperture state, close outdoor fan and adjust compressor to the frequency that defrosts, heightened after the preset lime with the first rising film condensation electric expansion valve to the second aperture state, wherein, the opening value of the second aperture state is more than the opening value of the first aperture state.The defrosting control method of the air conditioner of the present invention, can realize defrosting, method is simple, and reliability is high without stopping compressor.The invention also discloses a kind of air conditioner.
Description
Technical field
The invention belongs to technical field of electric appliances, more particularly to a kind of defrosting control method of air conditioner, and a kind of air-conditioning
Device.
Background technology
Air conditioner is a kind of refrigerant by its inside via compressor, condenser, four portions of throttle part and evaporator
The refrigeration of part composition or the device for heating circulation.When air conditioner carries out heating circulation, refrigerant becomes by compressor compresses
High-temperature high-pressure state, and then it is reduced to indoor radiating, and when flowing through throttle part in evaporator by four-way valve refrigerant
Temperature and pressure, then the low temperature, the refrigerant of low pressure heat can be absorbed when flowing through condenser, compressor is finally flowed back to again
In.Wherein, compressor compresses process, condenser condensation process and throttle part throttling process are in the outdoor unit of air conditioner
Carry out, and evaporator process is carried out in the presence of the tubular wine wheel and evaporator that air supply motor indoors in machine drives.
Kind of refrigeration cycle then with above-mentioned to heat cyclic process opposite.Air conditioner is generally divided into detachable wall air conditioner and separated floor air-conditioning
Device.
In the case where outdoor environment temperature is relatively low, air conditioner operation heats easy frosting.Generally in order to defrost
Compressor operating can be stopped, and then after switching four-way valve, compressor is run again to be defrosted, that is, need to shut down
Defrosting.In addition, in the related art, can be realized by bypass and not shut down defrosting, but system complex, and poor reliability.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose a kind of defrosting control method of air conditioner, and the defrosting control method, which need not stop compressor, to be realized
Defrosting, method is simple, and reliability is high.
It is another object of the present invention to propose a kind of air conditioner.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of defrosting control method of air conditioner, the defrosting
Control method comprises the following steps：Obtain environment temperature and the temperature or the temperature of super cooled sect of outdoor heat exchanger outlet；According to institute
State environment temperature and the temperature of outdoor heat exchanger outlet or the temperature of super cooled sect judges whether to meet defrosting condition；And when judgement
When meeting the defrosting condition, the wind speed and control electric expansion valve for reducing indoor fan are turned down to the first aperture state, are closed
Outdoor fan simultaneously adjusts compressor to the frequency that defrosts, and is heightened after the preset lime with electric expansion valve described in the first rising film condensation
To the second aperture state, wherein, the opening value of the second aperture state is more than the opening value of the first aperture state.
The defrosting control method of air conditioner according to embodiments of the present invention, when air conditioner meets defrosting condition, reduces room
The wind speed of inner blower and control electric expansion valve are turned down to the first aperture state, to reduce retaining for liquid refrigerants in condenser,
Defrost efficiency is improved, outdoor fan is closed and adjusts compressor to the frequency that defrosts, after the preset lime with the first rising film condensation
Electric expansion valve is heightened to the second aperture state, and the heat that heat is exchanged at heat exchanger indoors tails off, then from indoor heat exchanger
High-temperature gas out, enters to outdoor exchanger, carries out heat exchange, then outdoor unit surrounding environment warms, without first stopping pressure
Contracting machine, you can realize the purpose of defrosting, it is ensured that while indoor temperature is not decreased obviously, improves running efficiency of system.In addition, should
Method is simple, and reliability is high.
Wherein, the first aperture state can be closed mode, and the second aperture state can be maximum opening value.
Further, the above method also includes：Detect the temperature of outdoor heat exchanger entrance；And when the outdoor heat exchanger
When the temperature of entrance is more than or equal to the first predetermined threshold value, judge that defrosting is finished, control the electric expansion valve to reset, and open
The outdoor fan.
Further, the temperature exported according to the environment temperature and outdoor heat exchanger or the temperature of super cooled sect judge
Defrosting condition whether is met to specifically include：
The temperature of indoor heat exchanger is obtained, and obtains the temperature of the outdoor heat exchanger outlet or temperature and the institute of super cooled sect
State the temperature difference between the temperature of indoor heat exchanger；If the environment temperature is more than the first temperature threshold, the temperature of selection second
Threshold value is spent as the parameter of defrosting condition, and judgement meets the defrosting when the temperature difference is more than the second temperature threshold value
Condition；If the environment temperature is less than or equal to first temperature threshold, the 3rd temperature threshold of selection is as except ice-lolly
The parameter of part, and judgement meets the defrosting condition when the temperature difference is more than three temperature threshold.
In addition, the above method also includes：If the temperature of the indoor heat exchanger is less than the 4th temperature threshold, priming chamber
The electric auxiliary heating device of interior machine, and indoor fan is closed, while ensureing that indoor temperature will not decline obvious, it can accelerate
Defrost speed；If the temperature of the indoor heat exchanger is more than the 5th temperature threshold, control the indoor fan to preset wind
Speed is operated, and to avoid fluctuations in indoor temperature, keeps comfortableness.
To reach above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of air conditioner, and the air conditioner includes room
Interior machine and outdoor unit, the indoor set are connected with the outdoor unit by coolant connecting tube, wherein, the indoor set includes interior
Heat exchanger, indoor fan and indoor controller；The outdoor unit include compressor, four-way valve, outdoor heat exchanger, outdoor fan,
Electric expansion valve and outdoor controller, and for detecting the first temperature detector of environment temperature and for detecting the outdoor
The second temperature detector of the temperature of heat exchanger exit or the temperature of super cooled sect；The outdoor controller is according to the environment temperature
The temperature or the temperature of super cooled sect that degree and outdoor heat exchanger are exported judge whether to meet defrosting condition, are judging to meet the defrosting
During condition, the indoor controller controls the indoor fan reduction wind speed, and the outdoor controller controls the electronic expansion
Valve is turned down to the first aperture state, is closed outdoor fan and is adjusted compressor to the frequency that defrosts, after the preset lime with first
Electric expansion valve described in rising film condensation is heightened to the second aperture state, wherein, the opening value of the second aperture state is more than institute
State the opening value of the first aperture state.
Air conditioner according to embodiments of the present invention, when meeting defrosting condition, reduces the wind speed and control electricity of indoor fan
Sub- expansion valve is turned down to the first aperture state, to reduce retaining for liquid refrigerants in condenser, improves defrost efficiency, is closed outdoor
Blower fan simultaneously adjusts compressor to the frequency that defrosts, and is heightened to second open with the first rising film condensation electric expansion valve after the preset lime
Degree state, the heat that heat is exchanged at heat exchanger indoors tails off, then the high-temperature gas come out from indoor heat exchanger enters to room
External switch, carries out heat exchange, then outdoor unit surrounding environment warms, without first stopping compressor, you can realize the purpose of defrosting,
While ensureing that indoor temperature is not decreased obviously, running efficiency of system is improved.
Wherein, the first aperture state can be closed mode, and the second aperture state can be maximum opening value.
Further, the outdoor unit also includes：3rd temperature detector, for detecting the outdoor heat exchanger entrance
Temperature；When the temperature of the outdoor heat exchanger entrance is more than or equal to the first predetermined threshold value, the outdoor controller judges to remove
Frost is finished, and controls the electric expansion valve to reset, and open the outdoor fan.
Further, the indoor set also includes：4th temperature detector, the temperature for detecting the indoor heat exchanger
Degree；The outdoor controller obtains the temperature of the outdoor heat exchanger outlet or the temperature of super cooled sect and the indoor heat exchanger
Temperature difference between temperature, when the environment temperature is more than the first temperature threshold, then selects second temperature threshold value to be used as defrosting
The parameter of condition, and judgement meets the defrosting condition when the temperature difference is more than the second temperature threshold value, and in institute
When stating environment temperature less than or equal to first temperature threshold, then the 3rd temperature threshold is selected as the parameter of defrosting condition,
And judge to meet the defrosting condition when the temperature difference is more than three temperature threshold.
In addition, when the temperature of the indoor heat exchanger is less than four temperature thresholds, in the indoor controller priming chamber
The electric auxiliary heating device of machine, and indoor fan is closed, can quickening while ensureing that indoor temperature will not decline obvious
White speed.When the temperature of the indoor heat exchanger is more than five temperature thresholds, the indoor controller controls the indoor wind
Machine is operated with default wind speed, to avoid fluctuations in indoor temperature, keeps comfortableness.
Brief description of the drawings
Fig. 1 is the flow chart of the defrosting control method of air conditioner according to an embodiment of the invention；
Fig. 2 is the flow chart of the defrosting control method of air conditioner according to another embodiment of the invention；
Fig. 3 is the adjustment curve signal of electric expansion valve during the defrosting according to the specific embodiment of the present invention
Figure；
Fig. 4 is the flow curve signal of electric expansion valve during the defrosting according to another specific embodiment of the present invention
Figure；And
Fig. 5 is the schematic diagram of the circulatory system of air conditioner according to an embodiment of the invention.
Reference：
Air conditioner 100,
Indoor heat exchanger 10, indoor fan 11 and indoor controller, compressor 12, four-way valve 13, outdoor heat exchanger 14, room
Outer blower fan 15, electric expansion valve 16, the first temperature detector 17, second temperature detector 18, the 3rd temperature detector 19, electricity are auxiliary
Help heater 20.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Below with reference to the accompanying drawings the defrosting control method and air conditioner of the air conditioner of the embodiment of the present invention described.
Air conditioner is when running heating mode, if outdoor temperature, than relatively low, outdoor unit is easy to frosting, for air-conditioning
The normal operation of device is, it is necessary to be defrosted.The defrosting control method of the air conditioner of the embodiment of the present invention is illustrated first.
Fig. 1 is the flow chart of the defrosting control method of the air conditioner according to one embodiment of the present of invention.As shown in figure 1,
The defrosting control method comprises the following steps：
S1, obtains environment temperature and the temperature or the temperature of super cooled sect of outdoor heat exchanger outlet.
For example, by the detector for detecting environment temperature being disposed in the outdoor on heat exchanger, and by installed in
The temperature sensor detection outlet temperature of the outlet of air conditioner, or examined by being disposed in the outdoor temperature at the super cooled sect of heat exchanger
Device is surveyed to detect the temperature of super cooled sect.
S2, the temperature or the temperature of super cooled sect exported according to environment temperature and outdoor heat exchanger, which judges whether to meet, removes ice-lolly
Part.
Specifically, Fig. 2 is the flow chart of the defrosting control method of the air conditioner according to one embodiment of the present of invention, outdoor
Controller judges whether air conditioner meets defrosting condition according to the parameter of detection temperature and defrosting condition, specifically includes：
S21, obtains the temperature of indoor heat exchanger, and obtains the temperature of outdoor heat exchanger outlet or temperature and the room of super cooled sect
Temperature difference between the temperature of interior heat exchanger.
Specifically, its middle portion temperature, and then calculating temperature difference are detected by the temperature detector set on indoor heat exchanger,
For example, Δ T=TO-T2, wherein, TOFor the outlet temperature of outdoor heat exchanger, T2For the middle portion temperature of indoor heat exchanger, Δ T is temperature
Degree is poor.
S22, if environment temperature is more than the first temperature threshold, selects second temperature threshold value as the ginseng of defrosting condition
Number, and judgement meets defrosting condition when temperature difference is more than second temperature threshold value.
Wherein, the first temperature threshold is usually zero, that is, when environment temperature is more than zero, judges Δ T and second temperature
The relation of threshold value, second temperature threshold value can be set as the case may be, when Δ T is more than second temperature threshold value, then be sentenced
It is disconnected to meet defrosting condition, and then enter defrosting mode.
S23, if environment temperature is less than or equal to the first temperature threshold, the 3rd temperature threshold of selection is used as defrosting condition
Parameter, and temperature difference be more than three temperature thresholds when judge meet defrosting condition.
For example, when environment temperature is less than or equal to zero degree, setting the 3rd temperature threshold, judging Δ T and the 3rd temperature threshold
The relation of value, the 3rd temperature threshold can be set as the case may be, when Δ T is more than three temperature thresholds, judge full
Sufficient defrosting condition.
When judging that air conditioner meets defrosting condition, it is not necessary to stop compressor, and then enter defrosting mode, perform step
S3。
S3, the wind speed and control electric expansion valve for reducing indoor fan is turned down to the first aperture state, closes outdoor fan
And compressor is adjusted to the frequency that defrosts, heightened after the preset lime with the first rising film condensation electric expansion valve to the second aperture shape
State.
Specifically, into defrosting mode, first control air conditioner indoor fan wind speed reduction, such as indoor fan with
Gentle breeze runs or stopped, and gradually adjusts electronic expansion valve opening to the first aperture state for example to minimum aperture, to reduce
Liquid refrigerants is retained in condenser, improves defrost efficiency.As shown in figure 3, bent for the regulation of electric expansion valve under defrosting mode
Line schematic diagram.The aperture of electric expansion valve when the N1 stages are air conditioner normal heating operation, into after defrosting mode, control electricity
Sub- expansion valve is to the first aperture state, for example, to minimum aperture, the N2 stages in such as Fig. 3.Specifically, the first aperture state can
With closed mode, after continuing for some time, control electric expansion valve is with the first raising speed, for example with excitation speed specifically for example
With 90PPS (Pulses Per Second, umber of pulse/second) speed, heighten to the second aperture state, such as the N3 ranks in Fig. 3
Section.Wherein, the opening value of the second aperture state is more than the opening value of the first aperture state, usually, and the second aperture state can be with
For the maximum opening value of electric expansion valve.
During electronic expansion valve regulation aperture is controlled, control outdoor fan, which keeps or improved rotation speed operation, to be continued
For a period of time, and compressor operating frequency is adjusted to the frequency that defrosts, usually, compressor can run peak frequency, for example, adjusting
The running frequency for saving compressor is higher than 50HZ.After outdoor fan keeps or improved rotating speed continuous service for a period of time, close
Indoor fan, wherein, outdoor fan need to only be closed before electronic expansion valve regulation to the second aperture state.
Under defrosting mode, electronic expansion valve regulation flow curve schematic diagram is as shown in figure 4, electronic expansion valve regulation is to first
For example minimum aperture P0 points of aperture state are when closing, after flow is zero, and then certain time, electronic expansion valve regulation to the
Two aperture states such as maximum opening value, electric expansion valve does not play throttling action during maximum opening value, and flow gradually increases, quite
Heat-shift is considerably less at exchanger indoors, then the high-temperature gas come out from indoor heat exchanger, and by stop valve, electronics is swollen
Swollen valve returns to outdoor exchanger, carries out heat exchange, then outdoor unit surrounding environment warms, so as to realize the purpose of defrosting, refrigerant by
Gas is converted into liquid, and the fluid reservoir of compressor is returned to via four-way valve.And then, into the refrigerant in compressor liquid storage can, portion
Divide shwoot, be compressed, discharged with high-temperature high-pressure state into compressor compresses intracavitary, by four-way valve, three-way cut-off valve enters
Enter indoor heat exchanger, completion once defrosts process, so circulation until defrosting terminates.Wherein, refrigerant can using R32 or
R290。
Put it briefly, the defrosting control method of the air conditioner of the embodiment of the present invention, when air conditioner runs heating mode, such as
Fruit meets defrosting condition, without stopping compressor, by adjusting the aperture of electric expansion valve, that is, controls the aperture of electric expansion valve
After adjusting to for example minimum aperture of the first opening value and continuing for some time, and then adjust for example maximum to the second opening value again
Opening value, that is, causing refrigerant, heat exchange amount is tailed off at exchanger indoors, then the refrigerant of high temperature is directly entered to outdoor heat exchanger,
So as to realize the purpose of defrost.
Further, during defrosting, the temperature of outdoor heat exchanger entrance is detected in real time, when outdoor heat exchanger entrance
When temperature is more than or equal to the first predetermined threshold value, judge that defrosting is finished, wherein, the first predetermined threshold value can be true by experimental data
Fixed, usually, the first predetermined threshold value can be zero degree, that is to say, that reach or surpass zero in the inlet temperature of outdoor heat exchanger
When spending, stop defrosting process.
After defrosting is finished, then control electric expansion valve to reset, and open outdoor fan, indoor fan is according to setting
Program operation, air conditioner enter normal heating operation state.
In addition, during defrosting, in order to ensure that indoor temperature will not be reduced substantially, if the temperature of indoor heat exchanger is low
In the 4th temperature threshold, then start the electric auxiliary heating device of indoor set, and close indoor fan, in this way, then can raising
White speed.And then, indoor temperature also gradually rises, if the temperature of indoor heat exchanger is more than the 5th temperature threshold, control room
Inner blower is operated with default wind speed, and indoor temperature can be avoided to produce obvious fluctuation, the 4th temperature threshold and the 5th temperature
Degree threshold value can be set according to experimental data.
In summary, the defrosting control method of air conditioner according to embodiments of the present invention, defrosting condition is met in air conditioner
When, the wind speed and control electric expansion valve for reducing indoor fan are turned down to the first aperture state, cold to reduce liquid in condenser
Matchmaker's retains, and improves defrost efficiency, closes outdoor fan and adjusts compressor to the frequency that defrosts, after the preset lime with first
Rising film condensation electric expansion valve is heightened to the second aperture state, and the heat that heat is exchanged at heat exchanger indoors tails off, then from room
The high-temperature gas that interior heat exchanger comes out, enters to outdoor exchanger, carries out heat exchange, then outdoor unit surrounding environment warms, without
First stop compressor, you can realize the purpose of defrosting, it is ensured that while indoor temperature is not decreased obviously, improve system operation effect
Rate.In addition, when the temperature of heat exchanger is less than four temperature thresholds indoors, the electric auxiliary heating device in control room, and close
Indoor fan, while ensureing that indoor temperature will not decline obvious, can accelerate defrost speed.If the temperature of indoor heat exchanger
Degree is more than the 5th temperature threshold, then controls indoor fan to be operated with default wind speed, to avoid fluctuations in indoor temperature, keeps relaxing
Adaptive.
In order to realize above-described embodiment, the present invention also proposes a kind of air conditioner.
Fig. 5 is the schematic diagram of the circulatory system of the air conditioner according to one embodiment of the present of invention.As shown in figure 5, the sky
Device 100 is adjusted to include indoor set and outdoor unit, indoor set is connected with stating outdoor unit by coolant connecting tube.
Wherein, indoor set includes indoor heat exchanger 10, indoor fan 11 and indoor controller；Outdoor unit includes compressor
12nd, four-way valve 13, outdoor heat exchanger 14, outdoor fan 15, electric expansion valve 16 and outdoor controller, and for detecting environment
First temperature detector 17 of temperature and the second temperature for detecting the temperature of outdoor heat exchanger outlet or the temperature of super cooled sect
Spend detector 18.
The temperature or the temperature of super cooled sect that outdoor controller is exported according to environment temperature and outdoor heat exchanger judge whether full
Sufficient defrosting condition.Specifically, the 4th temperature detector, the temperature for detecting indoor heat exchanger 10 are set on heat exchanger 10 indoors
Degree, the temperature at the middle part of such as the 4th temperature detector detection indoor heat exchanger 10.And then, outdoor controller obtains outdoor heat exchange
Temperature difference between the temperature or the temperature of super cooled sect and the temperature of indoor heat exchanger 10 of device outlet, for example, Δ T=TO-T2, its
In, TOFor the outlet temperature of outdoor heat exchanger, T2For the middle portion temperature of indoor heat exchanger, Δ T is temperature difference.
When environment temperature is more than the first temperature threshold, then outdoor controller selection second temperature threshold value is used as defrosting condition
Parameter, and temperature difference be more than second temperature threshold value when judge meet defrosting condition.Wherein, the first temperature threshold is usually
Zero, that is, it is the relation that affectionate controller judges Δ T and second temperature threshold value, second temperature when environment temperature is more than zero
Threshold value can be set as the case may be, when Δ T is more than second temperature threshold value, then judge to meet defrosting condition, and then
Into defrosting mode.
Environment temperature be less than or equal to the first temperature threshold when, then outdoor controller select the 3rd temperature threshold as except
The parameter of ice-lolly part, and judgement meets defrosting condition when temperature difference is more than three temperature thresholds.For example, being less than in environment temperature
Or during equal to zero degree, the 3rd temperature threshold is set, outdoor controller judges the relation of Δ T and the 3rd temperature threshold, the 3rd temperature
Threshold value can be set as the case may be, and when Δ T is more than three temperature thresholds, judgement meets defrosting condition.
When judging to meet defrosting condition, it is not necessary to stop compressor, and then enter defrosting mode, indoor controller control
Indoor fan 11 reduces wind speed, and such as indoor fan is run or stopped with gentle breeze.Outdoor controller controls electric expansion valve 16
Turn down to the first aperture state, close outdoor fan 15 and adjust compressor 12 to defrosting frequency, after the preset lime with the
One rising film condensation electric expansion valve 16 is heightened to the second aperture state, wherein, the opening value of the second aperture state is opened more than first
The opening value of degree state.
As shown in figure 3, being the adjustment curve schematic diagram of electric expansion valve under defrosting mode.The N1 stages be air conditioner 100 just
The aperture of electric expansion valve 16 during normal heating operation, into after defrosting mode, controls the aperture shape of electric expansion valve 16 to the first
In N2 stage of the state for example into minimum aperture such as Fig. 3, specifically, the first aperture state can be in closed mode, when continuing one section
Between after, control electric expansion valve 16 with the first raising speed, such as with excitation speed specifically for example with 90PPS (Pulses Per
Second, umber of pulse/second) speed, heighten to the second aperture state, such as the N3 stages in Fig. 3.Wherein, the second aperture shape
The opening value of state is more than the opening value of the first aperture state, usually, and the second aperture state can be for electric expansion valve 16 most
Big opening value.
During the control regulation aperture of electric expansion valve 16, control outdoor fan 15 keeps or improved rotation speed operation
Continue for some time, and adjust the running frequency of compressor 12 to the frequency that defrosts, usually, compressor 12 can run maximum frequency
Rate, for example, the running frequency of regulation compressor is higher than 50HZ.When outdoor fan 15 keeps or improved one section of rotating speed continuous service
Between after, close indoor fan 11, wherein, outdoor fan 15 need to be only adjusted to before the second aperture state in electric expansion valve 16
Closing.
Under defrosting mode, electric expansion valve 16 regulation flow curve schematic diagram as shown in figure 4, electric expansion valve 16 adjust to
When being closed during the first aperture state such as minimum aperture, after flow is zero, and then certain time, electric expansion valve 16 is adjusted
To the second aperture state such as maximum opening value, electric expansion valve 16 does not play throttling action during maximum opening value, and flow gradually increases
Plus, tailed off equivalent to heat-shift at exchanger 10 indoors, then the high-temperature gas come out from indoor heat exchanger 10, by cut-off
Valve, electric expansion valve 16 returns to outdoor exchanger 14, carries out heat exchange, then outdoor unit surrounding environment warms, so as to realize defrosting
Purpose, refrigerant is converted into liquid by gas, the fluid reservoir of compressor 12 returned to via four-way valve 13.And then, into compressor
Refrigerant in fluid reservoir, part shwoot, into the compression chamber of compressor 12 in be compressed, discharged with high-temperature high-pressure state, pass through
Four-way valve 13 is crossed, three-way cut-off valve gets in heat exchanger 10, and completion once defrosts process, so circulation until defrosting terminates.
Wherein, refrigerant can use R32 or R290.
Put it briefly, the air conditioner 100 of the embodiment of the present invention, when running heating mode, if meeting defrosting condition, nothing
Compressor 12 need to be stopped, by adjusting the aperture of electric expansion valve 16, the i.e. aperture regulation of control electric expansion valve 16 to first
For example minimum aperture of opening value and after continuing for some time, and then adjust again to the second opening value such as maximum opening value, i.e.,
So that heat exchange amount tails off refrigerant at exchanger 10 indoors, then the refrigerant of high temperature is directly entered to outdoor heat exchanger 14, so that
Realize the purpose of defrost.
Further, outdoor unit also includes the 3rd temperature detector 19, and the 3rd temperature detector 19 is used to detect that outdoor is changed
The temperature of the hot entrance of device 14.When the temperature of the entrance of outdoor heat exchanger 14 is more than or equal to the first predetermined threshold value, outdoor controller
Judge that defrosting is finished, wherein, the first predetermined threshold value can be determined by experimental data, usually, and the first predetermined threshold value can be
Zero degree, that is to say, that when the inlet temperature of outdoor heat exchanger 14 reaches or surpasses zero degree, stops defrosting process.
After defrosting is finished, then control electric expansion valve 16 to reset, and open outdoor fan 15, indoor fan 11 is pressed
According to the program operation of setting, air conditioner 100 enters normal heating operation state.
In addition, during defrosting, in order to ensure that indoor temperature will not be reduced substantially, the temperature of heat exchanger 10 is low indoors
When four temperature thresholds, indoor controller starts the electric auxiliary heating device 20 of indoor set, and closes indoor fan 11, such as
This, can improve defrost speed.And then, indoor temperature also gradually rises, and the temperature of heat exchanger 10 is more than the 5th temperature indoors
During threshold value, indoor controller controls indoor fan 11 to be operated with default wind speed, indoor temperature can be avoided to produce obvious
Fluctuation, the 4th temperature threshold and the 5th temperature threshold can be set according to experimental data.
Air conditioner according to embodiments of the present invention, when meeting defrosting condition, reduces the wind speed and control electricity of indoor fan
Sub- expansion valve is turned down to the first aperture state, to reduce retaining for liquid refrigerants in condenser, improves defrost efficiency, is closed outdoor
Blower fan simultaneously adjusts compressor to the frequency that defrosts, and is heightened to second open with the first rising film condensation electric expansion valve after the preset lime
Degree state, the heat that heat is exchanged at heat exchanger indoors tails off, then the high-temperature gas come out from indoor heat exchanger enters to room
External switch, carries out heat exchange, then outdoor unit surrounding environment warms, without first stopping compressor, you can realize the purpose of defrosting,
While ensureing that indoor temperature is not decreased obviously, running efficiency of system is improved.
In addition, when the temperature of heat exchanger is less than four temperature thresholds indoors, the electric auxiliary heating device in control room, and
Indoor fan is closed, while ensureing that indoor temperature will not decline obvious, defrost speed can be accelerated.If indoor heat exchanger
Temperature be more than the 5th temperature threshold, then control indoor fan to be operated with default wind speed, to avoid fluctuations in indoor temperature, protect
Hold comfortableness.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
Any process described otherwise above or method description are construed as in flow chart or herein, represent to include
Module, fragment or the portion of the code of one or more executable instructions for the step of realizing specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not be by shown or discussion suitable
Sequence, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Represent in flow charts or logic and/or step described otherwise above herein, for example, being considered use
In the order list for the executable instruction for realizing logic function, it may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress for combining these instruction execution systems, device or equipment and using
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Electricity with one or more wirings
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, can even is that can be in the paper of printing described program thereon or other are suitable for computer-readable medium
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, the software that multiple steps or method can in memory and by suitable instruction execution system be performed with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, the application specific integrated circuit with suitable combinational logic gate circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method is carried
Rapid to can be by program to instruct the hardware of correlation to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing module, can also
That unit is individually physically present, can also two or more units be integrated in a module.Above-mentioned integrated mould
Block can both be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The integrated module is such as
Fruit is realized using in the form of software function module and as independent production marketing or in use, can also be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although having been shown and retouching above
Embodiments of the invention are stated, it is to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as the limit to the present invention
System, one of ordinary skill in the art can be changed to above-described embodiment, change, replace and become within the scope of the invention
Type.
Claims (8)
1. a kind of defrosting control method of air conditioner, it is characterised in that comprise the following steps：
Obtain environment temperature and the temperature or the temperature of super cooled sect of outdoor heat exchanger outlet；
Judge whether to meet defrosting condition according to the temperature of the temperature or super cooled sect of the environment temperature and outdoor heat exchanger outlet,
Wherein, obtain the temperature of indoor heat exchanger, and obtain the temperature of outdoor heat exchanger outlet or the temperature of super cooled sect with it is described
Temperature difference between the temperature of indoor heat exchanger, if the environment temperature is more than the first temperature threshold, selects second temperature
Threshold value and judges when the temperature difference is more than the second temperature threshold value to meet and described removes ice-lolly as the parameter of defrosting condition
Part, or, if the environment temperature is less than or equal to first temperature threshold, the 3rd temperature threshold of selection is used as defrosting
The parameter of condition, and judgement meets the defrosting condition when the temperature difference is more than three temperature threshold；And
When judging to meet the defrosting condition, the wind speed and control electric expansion valve for reducing indoor fan are turned down to the first aperture
State, closes outdoor fan and adjusts compressor to the frequency that defrosts, after the preset lime with electronics described in the first rising film condensation
Expansion valve is heightened to the second aperture state, wherein, the opening value of the second aperture state is more than the first aperture state
Opening value.
2. the defrosting control method of air conditioner as claimed in claim 1, it is characterised in that the first aperture state is closing
State, the second aperture state is maximum opening value.
3. the defrosting control method of air conditioner as claimed in claim 1, it is characterised in that also include：
Detect the temperature of outdoor heat exchanger entrance；And
When the temperature of the outdoor heat exchanger entrance is more than or equal to the first predetermined threshold value, judge that defrosting is finished, control is described
Electric expansion valve resets, and opens the outdoor fan.
4. the defrosting control method of air conditioner as claimed in claim 1, it is characterised in that also include：
If the temperature of the indoor heat exchanger is less than the 4th temperature threshold, start the electric auxiliary heating device of indoor set, and
Close indoor fan；
If the temperature of the indoor heat exchanger is more than the 5th temperature threshold, the indoor fan is controlled to be carried out with default wind speed
Work.
5. a kind of air conditioner, it is characterised in that the air conditioner includes indoor set and outdoor unit, the indoor set and the outdoor
Machine is connected by coolant connecting tube, wherein,
The indoor set includes indoor heat exchanger, indoor fan and indoor controller；
The outdoor unit includes compressor, four-way valve, outdoor heat exchanger, outdoor fan, electric expansion valve and outdoor controller, with
And for detecting the first temperature detector of environment temperature and temperature or supercooling for detecting outdoor heat exchanger outlet
The second temperature detector of the temperature of section；
4th temperature detector, the temperature for detecting the indoor heat exchanger；
The temperature or the temperature of super cooled sect that the outdoor controller is exported according to the environment temperature and outdoor heat exchanger judge
It is no to meet defrosting condition, wherein, the outdoor controller obtains the temperature of the outdoor heat exchanger outlet or the temperature of super cooled sect
Temperature difference between the temperature of the indoor heat exchanger, when the environment temperature is more than the first temperature threshold, then selects the
Two temperature thresholds and judge when the temperature difference is more than the second temperature threshold value to meet described as the parameter of defrosting condition
Defrosting condition, or, when the environment temperature is less than or equal to first temperature threshold, then select the 3rd temperature threshold to make
For the parameter of defrosting condition, and judge when the temperature difference is more than three temperature threshold to meet the defrosting condition, with
And, when judging to meet the defrosting condition, the indoor controller controls the indoor fan reduction wind speed, the outdoor control
Device processed controls the electric expansion valve to turn down to the first aperture state, closes outdoor fan and adjusts compressor to the frequency that defrosts,
Heightened after the preset lime with electric expansion valve described in the first rising film condensation to the second aperture state, wherein, described second opens
The opening value of degree state is more than the opening value of the first aperture state.
6. air conditioner as claimed in claim 5, it is characterised in that the first aperture state is closed mode, described second
Aperture state is maximum opening value.
7. air conditioner as claimed in claim 5, it is characterised in that the outdoor unit also includes：
3rd temperature detector, the temperature for detecting the outdoor heat exchanger entrance；
When the temperature of the outdoor heat exchanger entrance is more than or equal to the first predetermined threshold value, the outdoor controller judges defrosting
Finish, control the electric expansion valve to reset, and open the outdoor fan.
8. air conditioner as claimed in claim 5, it is characterised in that
When the temperature of the indoor heat exchanger is less than four temperature thresholds, the indoor controller starts the electricity auxiliary of indoor set
Heater, and indoor fan is closed, and when the temperature of the indoor heat exchanger is more than five temperature thresholds, the interior
Controller controls the indoor fan to be operated with default wind speed.
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| CN201410855418.0A CN104596032B (en) | 2014-12-31 | 2014-12-31 | Air conditioner and its defrosting control method |
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|---|---|---|---|
| CN201410855418.0A CN104596032B (en) | 2014-12-31 | 2014-12-31 | Air conditioner and its defrosting control method |
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| CN104596032B true CN104596032B (en) | 2017-08-29 |
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