CN107166644A - Air conditioner defrosting control method - Google Patents
Air conditioner defrosting control method Download PDFInfo
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- CN107166644A CN107166644A CN201710349019.0A CN201710349019A CN107166644A CN 107166644 A CN107166644 A CN 107166644A CN 201710349019 A CN201710349019 A CN 201710349019A CN 107166644 A CN107166644 A CN 107166644A
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- Prior art keywords
- air conditioner
- defrosting
- outdoor unit
- unit coil
- dew
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The invention belongs to air-conditioning technical field, and in particular to a kind of air conditioner defrosting control method.In order to more accurately judge the opportunity into defrosting, air conditioner defrosting control method proposed by the present invention comprises the following steps：In the case of air conditioner is in heating condition, outdoor unit coil temperature is detected；The difference between an outdoor unit coil temperature and dew-point temperature is obtained every the first preset time；Calculate the average value of the difference between the outdoor unit coil temperature obtained and dew-point temperature；According to the average value of the difference between the outdoor unit coil temperature and dew-point temperature, judge whether to make air conditioner enter defrosting mode.The time window that defrosting judges can farthest be extended by the average value of the difference between outdoor unit coil temperature and dew-point temperature, so as to more reasonably judge whether outdoor unit is stably in frosting state, it is to avoid instantaneous frosting causes air conditioner to frequently enter the phenomenon that defrosting is operated.
Description
Technical field
The invention belongs to air-conditioning technical field, and in particular to a kind of air conditioner defrosting control method.
Background technology
Air conditioner is as a kind of equipment that can adjust indoor environment temperature, its operation principle：By refrigerant
Indoor environment temperature is set to reduce or raise between circulation line by the State Transferring of high voltage/low voltage/gaseous state/liquid, i.e.,
From the perspective of indoor set, air conditioner is in refrigeration or heating condition.It is empty in the case of air conditioner is in heating condition
Easily frosting on the coil pipe of outdoor unit (evaporator) is adjusted, the frosting of outdoor unit coil pipe can cause the hydraulic performance decline of refrigeration system, so that
The heating effect of air conditioner is influenceed, the comfortableness of indoor environment is reduced, Consumer's Experience is influenceed.Therefore, it is in and heats in air conditioner
, it is necessary to carry out timely and effective defrosting to the outdoor unit coil pipe of air conditioner in the case of operating mode.
To solve the problems, such as the frosting of air conditioner, typically defrosted in the prior art using freezing (four-way valve is commutated, it is inverse to follow
Ring) or bypass defrosting (individually drawing loop to air-conditioner outdoor unit from the high-pressure side of compressor) mode air-conditioner outdoor unit is entered
Row defrosting.Wherein, can significantly it be declined using the environment temperature in room during refrigeration Defrost mode, so that reduce air-conditioning heats effect
Really, the comfortableness of indoor environment is influenceed, that is, sacrifices Consumer's Experience.It may proceed to enter air-conditioning using refrigerant during bypass Defrost mode
Heated in indoor set, i.e. air conditioner can be made to remain within heating condition, therefore bypass Defrost mode is obtained in recent years
It is widely applied.On the basis of Defrost mode determination, in order to ensure that the heating efficiency of indoor environment is unaffected, it should use up
It can be avoided that false defrosting (meets defrosting condition, but due to the more low reason of the humidity ratio of air, unit now is actual not to be had
Frosting) or defrosting excessively (meet the condition for continuing to defrost, but due to the reason, unit now such as the temperature of air is higher
It is actual to have completed defrosting) number of times.In consideration of it, selecting suitable defrosting opportunity to seem most important.Current Defrost method
It is generally necessary to ambient parameter is introduced, such as temperature, humidity., such as can be by setting several outdoor environment temperatures by taking temperature as an example
Interval, judge whether in one fixed temperature difference (environment temperature and the difference of outdoor unit coil temperature) of each interval setting
Air conditioner is set to enter defrosting mode.But, this mode has error in the opportunity judgement for entering defrosting, and vacation often occurs
Defrost or defrost excessive phenomenon.
The patent application document of Application No. " 201410372226.4 " discloses a kind of air-conditioner defrosting method, this application
In, the opportunity that outdoor unit enters defrosting mode is that outdoor unit coil temperature is less than dew-point temperature.Entered using the condition judgment and removed
Often there is the phenomenon frequently defrosted in the opportunity of frost.As long as that is, outdoor unit coil temperature is less than dew-point temperature, that is, carrying out
Defrosting, so, it is likely that outdoor unit coil temperature does not have started frosting or frosting degree very just below dew-point temperature
Small, air conditioner has been put into defrosting mode.Even if there is outdoor unit coil temperature relative to fluctuating above and below dew-point temperature
Situation, and cause the usage experience of phenomenon, greatly influence user frequently defrosted.
Therefore, this area needs a kind of new defrosting control method to solve the above problems.
The content of the invention
It is in order to solve above mentioned problem of the prior art, i.e., of the invention in order to more accurately judge the opportunity into defrosting
A kind of air conditioner defrosting control method is proposed, the defrosting control method comprises the following steps：Heating condition is in air conditioner
In the case of, detect outdoor unit coil temperature；An outdoor unit coil temperature and dew-point temperature are obtained every the first preset time
Between difference；Calculate the average value of the difference between the outdoor unit coil temperature obtained and dew-point temperature；According to the outdoor
The average value of difference between machine coil temperature and dew-point temperature, judges whether to make air conditioner enter defrosting mode.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, " according to the outdoor unit coil temperature and dew
Point temperature between difference average value, judge whether to make air conditioner enter defrosting mode " the step of specifically include：Judge described
Whether the average value of the difference between outdoor unit coil temperature and dew-point temperature is more than the first given threshold；If the outdoor unit
The average value of difference between coil temperature and dew-point temperature is not more than first given threshold, then maintains the air conditioner
Heating condition, does not enter defrosting mode；If the average value of the difference between the outdoor unit coil temperature and dew-point temperature is big
In first given threshold, then judge whether the duration of the state is more than the second preset time, if the state is held
The continuous time is more than second preset time, then the air conditioner is entered defrosting mode；If the duration of the state is not
More than second preset time, then the air conditioner is maintained heating condition, do not enter defrosting mode.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, first preset time is 10-20 seconds in
Arbitrary value.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, first given threshold is 1-3 degrees Celsius
In the range of arbitrary value, and second preset time be 1-3 minutes in arbitrary value.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, first given threshold is 2 degrees Celsius, institute
It is 15 seconds to state the first preset time, and second preset time is 2 minutes.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, the defrosting control method is also including judgement
Not no the step of exit defrosting mode, the step includes：After the air conditioner enters defrosting mode, relatively more described outdoor unit disk
Pipe temperature and the second given threshold；According to comparative result, judge whether to exit defrosting mode.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, " according to comparative result, judge whether to exit and remove
The step of white pattern ", further comprises：In the case of the outdoor unit coil temperature is more than second given threshold, judge
Whether the duration of the state is more than the 3rd preset time, if the duration of the state is default more than the described 3rd
Between, then the air conditioner is exited defrosting mode；If the duration of the state is not more than the 3rd preset time, make
The air conditioner maintains the defrosting operating condition.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, second given threshold is 6-10 degrees Celsius
In the range of arbitrary value.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, the 3rd preset time is 30-60 seconds models
Enclose interior arbitrary value.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, the defrosting mode is by turning on bypass branch
The bypass defrosting mode that the mode on road is defrosted to outdoor unit coil pipe.
In the inventive solutions, by detecting outdoor unit coil temperature, according to outdoor unit coil temperature and dew point
The average value of difference between temperature, judges whether to make air conditioner enter defrosting mode.With directly being compared outdoor unit coil temperature
, can be with maximum journey by the average value of the difference between outdoor unit coil temperature and dew-point temperature compared with the mode of dew-point temperature
The time window that the extension defrosting of degree ground judges, so as to more reasonably judge whether outdoor unit is stably in frosting state, keeps away
Exempt from the phenomenon that instantaneous frosting causes air conditioner to frequently enter defrosting operation.More specifically, in outdoor unit coil temperature and dew point temperature
The average value of difference between degree is met on the basis of condition, then judges the duration of the state, can more accurately judge
The frosting degree of outdoor unit, on the premise of avoiding frequently entering defrosting operation, it is ensured that the dynamics and effect of defrosting operation, is improved
Consumer's Experience.In addition, the present invention is when being defrosted, the mode of selection bypass defrosting, so, in the process of bypass defrosting
In, compressor is not shut down, and four-way valve is not also commutated, and air conditioner is heated incessantly, can greatly ensure the system of air conditioner
Thermal effect, minimizes fluctuations in indoor temperature.
Brief description of the drawings
Fig. 1 is the structural representation of existing air conditioner；
Fig. 2 is the key step flow chart of the air conditioner defrosting control method of the present invention；
Fig. 3 is the structural representation of the air conditioner of one embodiment of the invention；
Fig. 4 is the specific steps flow chart of the air conditioner defrosting control method of the present invention.
Embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining the technical principle of the present invention, it is not intended that limit the scope of the invention.Although for example,
In the application according to particular order describe the present invention method each step, but these be not sequentially it is restricted,
On the premise of without departing from the general principle of the present invention, those skilled in the art can perform the step in a different order
Suddenly.
Based on the opportunity problem for entering defrosting proposed in background technology, the present invention proposes a kind of defrosting control of air conditioner
Method processed, it is intended to make air conditioner enter defrosting mode on suitable defrosting opportunity, it is to avoid false defrosting, defrosting occur excessively etc. existing
As so as to be reduced as far as or even avoid because air-conditioning heating effect reduces phenomenon caused by defrosting.
Referring initially to Fig. 1, the figure is the structural representation of existing air conditioner.As shown in figure 1, air conditioner mainly includes outdoor
Machine 1, indoor set 2, compressor 3, four-way valve 4 and throttling arrangement 5.To those skilled in the art, the structure of air conditioner
Belong to and know technology, be not described in detail herein.
Referring next to Fig. 2, defrosting control method of the invention comprises the following steps：S110, is in air conditioner and heats work
In the case of condition, outdoor unit coil temperature is detected；S120, an outdoor unit coil temperature and dew are obtained every the first preset time
Difference between point temperature；S130, calculates the average value of the difference between the outdoor unit coil temperature obtained and dew-point temperature；
S140, according to the average value of the difference between outdoor unit coil temperature and dew-point temperature, judges whether to make air conditioner enter defrosting
Pattern.
In above-mentioned steps S110-S140, dew-point temperature refers to air under the conditions of moisture content and air pressure are all immovable,
It is cooled to temperature during saturation.Therefore, when outdoor unit coil temperature is less than the dew-point temperature, knot will be easy on outdoor unit
Frost.In order to determine whether the frosting degree of outdoor unit, it is to avoid the phenomenon frequently defrosted occurs in air conditioner, more accurately to sentence
The disconnected opportunity for entering defrosting, the average value of the invention according to the difference between outdoor unit coil temperature and dew-point temperature, to judge
Whether air-conditioning is set to enter defrosting mode.Specifically, judge according only to the size of outdoor unit coil temperature and dew-point temperature into
Enter the opportunity of defrosting, there is the phenomenon frequently defrosted.For example, during winter, due to climate reasons, a burst of cold wind, which is blown over, to be also likely to
Cause the unexpected reduction of outdoor unit coil temperature, and the situation of moment frosting occur；Or air conditioner in the process of running due to
Itself or extraneous change and the outdoor unit coil temperature that occurs at a time is less than dew-point temperature, and and then this is extensive again
Multiple normal (i.e. the change of the rate of decay at this moment belongs to anomalous variation), then sky is now made according to the judgement at this moment
Adjust device to enter defrosting mode, it is clear that not to be suitable opportunity, if there is multiple this situation, then can cause frequently defrosting.For
This case is avoided, the present invention is passed through by the average value according to the difference between outdoor unit coil temperature and dew-point temperature
The difference between outdoor unit coil temperature and dew-point temperature is repeatedly obtained, the judgement time is extended to greatest extent using its average value
Window, it is to avoid single false defrosting phenomenon caused by judging.
It should be noted that the numerical value of dew-point temperature is relevant with air pressure and water vapour content, the value of dew-point temperature can profit
Calculated with the computational methods of existing dew-point temperature, dew-point temperature can also be measured using pertinent instruments (such as dew point hygrometer).
Then the dew-point temperature is set in the program of air conditioner.Or the dew point temperature of environment where being obtained by air conditioner in itself
After degree, the dew point temperature value in program is automatically updated.
Above-mentioned steps S110-S140 is described in further detail below.
In step s 110, outdoor unit coil pipe temperature can be detected in real time by being disposed in the outdoor machine coil temperature sensor
Degree, can also obtain outdoor unit coil temperature, these are without departure from protection scope of the present invention by other known means.
In the step s 120, it is preferable that the first preset time can be the arbitrary value in the range of 10-20 seconds.For example, can be with
First preset time is set to 10 seconds, 15 seconds, 20 seconds etc., those skilled in the art can select suitable according to practical application scene
The first suitable preset time.In a preferred embodiment of the invention, the first preset time is 15 seconds, i.e., obtained once every 15 seconds
Outdoor unit coil temperature, the outdoor unit coil temperature and the difference of dew-point temperature then obtained.Outdoor unit coil temperature and dew point
The difference of temperature can be represented with equation below：Δ T=Tes-Ti, wherein, Δ T is the difference of outdoor unit coil temperature and dew-point temperature
Value, Tes is dew-point temperature, TiFor outdoor unit coil temperature.
In step s 130, it is each based on the outdoor unit coil temperature obtained in step S120 and the difference of dew-point temperature
Minute calculates the average value of the difference of an outdoor unit coil temperature and dew-point temperature.It is i.e. per minute interior to obtain four outdoors
The difference of machine coil temperature and dew-point temperature, is expressed as Δ T1、ΔT2、ΔT3、ΔT4, its average value M=(Δ T1+ΔT2+
ΔT3+ΔT4)/4.It should be noted that although the present embodiment is to calculate an outdoor unit coil temperature and dew point temperature in each minute
The average value of difference between degree, but those skilled in the art can also be according to actual use scene settings in other times
(such as 30s, 90s) calculates the average value of the difference between outdoor unit coil temperature and dew-point temperature.These are all without departing from this hair
Bright protection domain.
In step S140, according to the average value of the difference between outdoor unit coil temperature and dew-point temperature, judge whether
Air conditioner is set to enter defrosting mode.Preferably, being averaged for the difference between outdoor unit coil temperature and dew-point temperature is first determined whether
Whether value is more than the first given threshold.The given threshold of the present embodiment first is the arbitrary value in 1-3 degrees Celsius.It is assumed that the first setting
Threshold value is 2 degrees Celsius, then, M=(Δ T1+ΔT2+ΔT3+ΔT4When)/4 are not more than 2, it is judged as that air-conditioning is not necessary to entrance
Defrosting, now makes air conditioner maintain heating condition, does not enter defrosting mode.
As average value M=(the Δ T of the difference between outdoor unit coil temperature and dew-point temperature1+ΔT2+ΔT3+ΔT4)/4
During ＞ 2, then judge whether the duration of the state is more than the second preset time.In the present embodiment, the second preset time is area
Between arbitrary value in 1-3 minutes.So that the second preset time is 2 minutes as an example, when average value M ＞ 2 state duration reaches 2
Minute, it is judged as that the frosting degree of outdoor unit has met the requirement on defrosting opportunity, now air conditioner is entered defrosting mode.It is no
Then, i.e. the state duration of average value M ＞ 2 is not up to 2 minutes, is judged as that air conditioner is not necessary to enter defrosting, is now made
Air conditioner maintains heating condition, does not enter defrosting mode.It will be readily appreciated by those skilled in the art that under frosting condition, with
The increase frosting degree of time also can gradually increase, and by setting the length of " duration ", can accurately judge outdoor unit
Frosting degree, so as to more accurately select defrosting opportunity.
In summary, the present invention is by detecting outdoor unit coil temperature, according to outdoor unit coil temperature and dew-point temperature it
Between difference average value, judge whether to make air conditioner enter defrosting mode.The present embodiment is accurately judged by two conditions
It is more than the first given threshold into the opportunity of defrosting, the i.e. average value of difference between outdoor unit coil temperature and dew-point temperature,
The state duration reaches the second preset time.By the two conditions, it not only may determine that outdoor unit has occurred
Frosting, can also further judge the degree of frosting, so that the opportunity for entering defrosting is more accurate.That is, as M ＞ 2
When, it can be determined that outdoor unit is in frosting condition, increases over time, frosting degree can be more and more, reached when the duration
After two minutes, it can be determined that the frosting degree of outdoor unit has reached to a certain degree, can enter defrosting mode.In addition it is also necessary to say
It is bright, it is above-mentioned in the first preset time, the second preset time, the first given threshold can be entered according to actual application scenarios
Row setting, can also be set by User Defined.
In addition, the step of control method of the present invention also comprises determining whether to exit defrosting mode, the step is specifically included
Substep：Step one：After air conditioner enters defrosting mode, compare outdoor unit coil temperature and the second given threshold；
Step 2, according to comparative result, judges whether to exit defrosting mode.The purpose of above-mentioned steps one and step 2 is that determination is exited
The opportunity of defrosting.During defrosting, all the heating effect of air-conditioning can be more or less reduced, so as to influence indoor environment
Comfortableness.Therefore, select suitable opportunity to exit defrosting mode, can as far as possible shorten and remove on the premise of defrosting effect is ensured
The white time, so as to reduce the influence to air-conditioning heating effect.
Specifically, the second given threshold can be the arbitrary value in 6-10 degree Celsius ranges.In the preferred reality of the present invention
Apply in example, the second given threshold is 8 degrees Celsius.In defrost mode, when detecting 8 degrees Celsius of outdoor unit coil temperature Ti ＞
When, then judge whether the duration of outdoor unit coil temperature Ti ＞ 8 state reaches the 3rd preset time.3rd preset time
Can be the arbitrary value in the range of 30-60 seconds.In a preferred embodiment of the invention, the 3rd preset time is 40 seconds, then, when
When outdoor unit coil temperature Ti ＞ 8 state continues more than 40 seconds, then judge that defrosting has been completed, defrosting is exited in now selection.
When outdoor unit coil temperature Ti is not more than 8, or outdoor unit coil temperature Ti is more than 8 but the duration was not less than 40 seconds,
It is judged as not completing defrosting, now continues defrosting mode.
It should be noted that in the above-described embodiments, being taken the photograph although exiting the condition of defrosting for outdoor unit coil temperature more than 8
Family name's degree and continue 40 seconds, those skilled in the art can also will move out the condition setting of defrosting to be above-mentioned according to practical application scene
In the range of other threshold values, as long as can accurately judge to exit the opportunity of defrosting.
As described above, in defrost mode, being carried out by the outdoor unit coil temperature that will be detected and the second given threshold
Compare, to judge whether to exit defrosting mode.Because Temperature Difference Ratio of the outdoor unit coil pipe before and after frosting is larger, therefore, according to room
Outer machine coil temperature change can more accurately judge whether defrosting completes, so that on the premise of defrosting effect is ensured, to the greatest extent
Amount shortens defrosting time, reduces the influence to air-conditioning heating effect.In addition it is also necessary to which explanation, the 3rd above is default
Time, the second given threshold can be set according to practical application scene, can also be set by User Defined.
In one preferred embodiment, air conditioner has bypass branch, and defrosting mode is by turning on bypass branch
The bypass defrosting mode that is defrosted to outdoor unit coil pipe of mode.Specifically, reference picture 3, Fig. 3 is the implementation of the present invention
The structural representation of the air conditioner of example.As shown in figure 3, in this embodiment, air conditioner mainly include outdoor unit 1, indoor set 2,
Compressor 3, four-way valve 4 and throttling arrangement 5 (being electric expansion valve in the present embodiment) and connection compressor 3 and outdoor unit 1
Bypass branch 6, be provided with unidirectional by-passing valve, such as magnetic valve 61 on bypass branch 6.If reaching defrosting condition, into side
Logical defrosting mode.Defrosting condition is exited if reached, bypass defrosting mode is exited.Below on the basis of Fig. 3, with reference to Fig. 4
The concrete operation step of the present invention is described in detail.
Fig. 4 shows the detail flow chart schematic diagram of a preferred embodiment of the defrosting control method of the present invention.Such as Fig. 4
It is shown, heated in air conditioner operation under state, detected an outdoor unit coil temperature Ti every 15 seconds, and calculate outdoor unit coil pipe
Difference DELTA T=Tes-T between temperature and dew-point temperaturei, wherein, Tes is dew-point temperature, TiFor outdoor unit coil temperature.Then
Calculate average value (the Δ T for the difference for calculating outdoor unit coil temperature and dew-point temperature1+ΔT2+ΔT3+ΔT4Whether)/4 are more than 2.
Wherein, Δ T1、ΔT2、ΔT3、ΔT4For the outdoor unit coil temperature and the difference of dew-point temperature calculated in one minute.When (Δ
T1+ΔT2+ΔT3+ΔT4It is that air conditioner does not enter defrosting state that)/4, which are not more than 2,.As (Δ T1+ΔT2+ΔT3+ΔT4The ＞ of)/4 2
When, judge whether the state duration reaches 2 minutes, if the duration of the state reaches 2 minutes, air conditioner sends and beaten
Control instruction is opened to magnetic valve 61, magnetic valve 61 is opened, the HTHP cold media gas part that compressor 3 is discharged is through four-way valve
4, which get in machine 2, continues to heat, and another part is directly entered outdoor unit 1 through bypass branch 6.The cold media gas of HTHP can
The organism temperature of outdoor unit 1 is improved in the shorter time, makes frost melts.So, during bypass defrosting, compressor
3 are not shut down, and four-way valve 4 is not also commutated, and air conditioner is heated incessantly, can greatly ensure the heating effect of air conditioner,
So that fluctuations in indoor temperature is smaller.As (Δ T1+ΔT2+ΔT3+ΔT4The ＞ of)/4 2 state is not up to 2 minutes, then does not enter and remove
White pattern.
With continued reference to Fig. 4, during defrosting, outdoor unit coil temperature T is persistently detectedi, and real-time judge outdoor unit disk
Pipe temperature TiWhether 8 degrees Celsius are more than, and if maintain to reach 40 seconds for more than 8 degrees Celsius, then judge defrosting completion, can be with
Defrosting is exited in selection.If it is not, then persistently being defrosted.When exiting defrosting, air conditioner sends closing control instruction and arrives magnetic valve
61, magnetic valve 61 is closed, and the HTHP cold media gas that compressor 3 is discharged all gets in machine 2 through four-way valve 4 and heated.
It should be noted that in order to shorten defrosting time, defrosting efficiency is lifted, can be by room when carrying out bypass defrosting
Exogenous wind office closes, and the heat of the cold media gas of HTHP is mostly used in defrost.When exiting defrosting operation, then by outdoor
Blower fan is opened.
Although above-described embodiment is illustrated exemplified by bypassing defrosting, but the defrosting control method of the present invention is not limited
In specific Defrost mode, those skilled in the art can select suitable Defrost mode according to the concrete structure of air conditioner, such as
Defrosting is replaced with bypass using reverse cycle defrosting, inverse circulation and the mode such as is combined.The present invention is intended to provide one kind can be more accurate
Ground judges the method for entering and exiting defrosting opportunity.
So far, combined preferred embodiment shown in the drawings describes technical scheme, still, this area
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these embodiments.Without departing from this
On the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to correlation technique feature, these
Technical scheme after changing or replacing it is fallen within protection scope of the present invention.
Claims (10)
1. a kind of air conditioner defrosting control method, it is characterised in that the defrosting control method comprises the following steps：
In the case of air conditioner is in heating condition, outdoor unit coil temperature is detected；
The difference between an outdoor unit coil temperature and dew-point temperature is obtained every the first preset time；
Calculate the average value of the difference between the outdoor unit coil temperature obtained and dew-point temperature；
According to the average value of the difference between the outdoor unit coil temperature and dew-point temperature, judge whether that entering air conditioner removes
White pattern.
2. air conditioner defrosting control method according to claim 1, it is characterised in that " according to the outdoor unit coil pipe temperature
Spend dew-point temperature between difference average value, judge whether to make air conditioner enter defrosting mode " the step of specifically include：
Judge whether the average value of the difference between the outdoor unit coil temperature and dew-point temperature is more than the first given threshold；
If the average value of the difference between the outdoor unit coil temperature and dew-point temperature is not more than first given threshold,
The air conditioner is maintained heating condition, do not enter defrosting mode；
If the average value of the difference between the outdoor unit coil temperature and dew-point temperature is more than first given threshold,
Judge whether the duration of the state is more than the second preset time,
If the duration of the state is more than second preset time, the air conditioner is set to enter defrosting mode；If
The duration of the state is not more than second preset time, then the air conditioner is maintained heating condition, defrosting is not entered
Pattern.
3. air conditioner defrosting control method according to claim 2, it is characterised in that first preset time is 10-
Arbitrary value in 20 seconds.
4. air conditioner defrosting control method according to claim 3, it is characterised in that first given threshold is 1-3
Arbitrary value in degree Celsius range, and second preset time is the arbitrary value in 1-3 minutes.
5. air conditioner defrosting control method according to claim 4, it is characterised in that first given threshold is taken the photograph for 2
Family name's degree, first preset time is 15 seconds, and second preset time is 2 minutes.
6. air conditioner defrosting control method according to any one of claim 1 to 5, it is characterised in that the defrosting control
The step of method processed also comprises determining whether to exit defrosting mode, the step includes：
After the air conditioner enters defrosting mode, relatively more described outdoor unit coil temperature and the second given threshold；
According to comparative result, judge whether to exit defrosting mode.
7. air conditioner defrosting control method according to claim 6, it is characterised in that " according to comparative result, judge whether
Exit defrosting mode " the step of further comprise：
The outdoor unit coil temperature be more than second given threshold in the case of, judge the state duration whether
More than the 3rd preset time,
If the duration of the state is more than the 3rd preset time, the air conditioner is set to exit defrosting mode；
If the duration of the state is not more than the 3rd preset time, the air conditioner is set to maintain the defrosting work
Condition.
8. air conditioner defrosting control method according to claim 6, it is characterised in that second given threshold is 6-10
Arbitrary value in degree Celsius range.
9. air conditioner defrosting control method according to claim 7, it is characterised in that the 3rd preset time is 30-
Arbitrary value in the range of 60 seconds.
10. air conditioner defrosting control method according to any one of claim 1 to 5, it is characterised in that the defrosting mould
Formula is the bypass defrosting mode defrosted by way of turning on bypass branch to outdoor unit coil pipe.
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| CN108151231A (en) * | 2017-12-25 | 2018-06-12 | 广东美的制冷设备有限公司 | Defrosting control method, defrosting control device and air conditioner |
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| CN110186154A (en) * | 2019-05-31 | 2019-08-30 | 四川长虹空调有限公司 | The defrosting method and device of air-conditioning |
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Application publication date: 20170915 |