CN109882994A - Air conditioner defrosting device and control method - Google Patents
Air conditioner defrosting device and control method Download PDFInfo
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- CN109882994A CN109882994A CN201811554303.2A CN201811554303A CN109882994A CN 109882994 A CN109882994 A CN 109882994A CN 201811554303 A CN201811554303 A CN 201811554303A CN 109882994 A CN109882994 A CN 109882994A
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- 238000010257 thawing Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 238000004378 air conditioning Methods 0.000 claims description 148
- 238000001704 evaporation Methods 0.000 claims description 23
- 239000003507 refrigerant Substances 0.000 claims description 20
- 238000009790 rate-determining step (RDS) Methods 0.000 claims description 14
- 230000002045 lasting effect Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 21
- 238000003384 imaging method Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 238000004458 analytical method Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000006071 cream Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention provides an air conditioner defrosting device and a control method, wherein the air conditioner defrosting device comprises: the judging module is used for judging whether the air conditioner starts to frost or not and judging whether the frosting amount exceeds a first preset value or not; and the control module enters a defrosting action when the air conditioner starts to frost and the frosting amount exceeds a first preset value. The invention can judge the air conditioner according to two aspects and angles of whether the air conditioner is frosted and the frosting amount, so that the defrosting step or action is started when the air conditioner is frosted and the frosting amount reaches a certain value, thereby avoiding unnecessary defrosting and influencing the performance of the air conditioner caused by that a large amount of frosting on the surface of the fin is not sent out a frosting instruction or the surface of the fin is not frosted or frosted and is thinned but is defrosted, effectively solving the problem of inaccurate defrosting judgment, effectively avoiding the condition of mistaken defrosting, and providing better heating effect for indoor personnel.
Description
Technical field
The invention belongs to air-conditioning technical fields, and in particular to a kind of air-conditioning defrosting device and control method.
Background technique
Heat pump air conditioner is in heating operation, once outdoor heat exchanger surface temperature is lower than the dew point and freezing point of air simultaneously
Temperature will frosting, cause heat transfer boundary condition to deteriorate, system performance reduces, and to guarantee that unit operates normally, defrosting operation must can not
It is few.
Existing defrosting control method mainly has: defrost temperature defrosting control methods, evaporating temperature defrosting control methods, air pressure difference
Defrost control methods, Maximum average heating capacity defrosting control methods, blower current control defrosting, temperature difference defrosting control methods or in which several
Kind method jointly controls defrosting etc..The intelligence, synthesization increasingly of miscellaneous defrosting control method.Problem is recognized
Deepen constantly positive gradual perfection defrosting criterion and control logic.But accidentally defrosting problem still fails to effectively be solved.
The a large amount of frostings of unit fin surface are directed to since wall-hanger air conditioner indoor unit in the prior art exists, frost layer is tight
Ghost image rings unit heating performance, but fails to issue defrosting instruction in time, causes defrosting time too long or except sordid problem；Or
Person is thin for the non-frosting of block surfaces or frost layer, unit heating performance is not impacted or is resulted only in minimal effect, but send out
Defrosting instruction out causes unnecessary defrosting to operate；Or the judgement inaccuracy for terminating defrost is caused during defrost
Frost is not changed clean or has changed clean but continuation defrost and wasted the technical problems such as energy, therefore researching and designing of the present invention goes out one kind
Air-conditioning defrosting device and control method.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that overcoming air-conditioner outdoor unit in the prior art, there are defrosts to sentence
Disconnected inaccuracy causes to fail to issue defrosting instruction in time, causes defrosting time too long or except unclean, or does not enter defrost condition
But judgement it is abnormal and cause should not defrosting operation defect, to provide a kind of air-conditioning defrosting device and control method.
The present invention provides a kind of air-conditioning defrosting device comprising:
Judgment module, for judging whether air-conditioning has begun frosting and judges whether frosting degree is default more than first
Value；
Control module enters defrost movement when air-conditioning has begun frosting and frosting degree is more than the first preset value.
Preferably,
It further include detection module, the real-time evaporating temperature T of the refrigerant for detecting outdoor heat exchanger1, and for detecting
The real-time defrost temperature T of fin surface2；
Further include computing module, is used for calculating difference T0=T1-T2,
Judgment module, wherein for judging whether air-conditioning has begun the judgement movement of frosting are as follows: for whether judging T0
It is lasting to reduce；
The control module is also used to work as T0It is lasting to reduce and judge that frosting degree is higher than the first preset value and constantly controls four
Port valve is commutated, is acted into defrost.
Preferably,
The computing module is also used to calculate real-time frosting degree, to judge whether frosting degree surpasses by the judgment module
Cross the first preset value；
And the computing module includes function generator, the function generator can be used in calculating the fin surface
Frosting degree, and the functional relation of the frosting degree are as follows: η N=(a1t1+b1T)/T0,0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, when t is the operation of air-conditioning
Between, t0For the heating time of air-conditioning, a1And b1It is related with the heat efficiency of air-conditioning for constant.
Preferably,
The judgment module, being also used to judge air-conditioning, whether the no longer frosting degree of frosting and judgement at this time is small
In the second preset value；
The control module is also used to when air-conditioning no longer frosting and when frosting degree is less than the second preset value enters end
The movement of defrost.
Preferably,
The real-time evaporating temperature T of refrigerant when including detection module, for detecting outdoor heat exchanger1, and for examining
Survey the real-time defrost temperature T of fin surface2；
And when including computing module, it to be used for calculating difference T0=T1-T2:
The judgment module, wherein for judging the air-conditioning whether no longer movement of frosting are as follows: for judging T0Whether
Continue within a preset time constant；
The control module is also used to work as T0Continue constant and judges that frosting degree constantly controls four lower than the second preset value
Port valve is commutated, terminates defrost.
Preferably,
The computing module is also used to calculate real-time frosting degree, to judge whether frosting degree is small by the judgment module
In the second preset value；
And the computing module includes function generator, the function generator can be used in calculating the fin surface
Frosting degree, and the functional relation of the frosting degree are as follows: η N=T0/(a1t1+b1T), 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, when t is the operation of air-conditioning
Between, t0For the heating time of air-conditioning, a1And b1It is related with the heat efficiency of air-conditioning for constant.
The present invention also provides a kind of air-conditioning defrosting control methods, use preceding described in any item air-conditioning defrosting devices, and
Further include:
Judgment step, for judging whether air-conditioning has begun frosting and judges whether frosting degree is default more than first
Value；
Rate-determining steps enter defrost movement when air-conditioning has begun frosting and frosting degree is more than the first preset value.
Preferably,
It further include detecting step, the real-time evaporating temperature T of the refrigerant for detecting outdoor heat exchanger1, and for detecting
The real-time defrost temperature T of fin surface2；
Further include calculating step, is used for calculating difference T0=T1-T2,
Judgment step, wherein for judging whether air-conditioning has begun the judgement movement of frosting are as follows: for judging T0Whether
It is lasting to reduce；
The rate-determining steps are also used to work as T0It is lasting to reduce and judge that frosting degree is higher than the first preset value and constantly controls four
Port valve is commutated, is acted into defrost.
Preferably,
The calculating step is also used to calculate real-time frosting degree, to judge whether frosting degree surpasses by the judgment step
Cross the first preset value；
And the calculating step includes function generator, the function generator can be used in calculating the fin surface
Frosting degree, and the functional relation of the frosting degree are as follows: η N=(a1t1+b1T)/T0, 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, when t is the operation of air-conditioning
Between, t0For the heating time of air-conditioning, a1And b1It is related with the heat efficiency of air-conditioning for constant.
Preferably,
The judgment step, being also used to judge air-conditioning, whether the no longer frosting degree of frosting and judgement at this time is small
In the second preset value；
The rate-determining steps are also used to when air-conditioning no longer frosting and when frosting degree is less than the second preset value enters end
The movement of defrost.
Preferably,
The real-time evaporating temperature T of refrigerant when including detecting step, for detecting outdoor heat exchanger1, and for examining
Survey the real-time defrost temperature T of fin surface2；
And when including calculating step, it to be used for calculating difference T0=T1-T2:
The judgment step, wherein for judging the air-conditioning whether no longer movement of frosting are as follows: for whether judging T0
Continue within a preset time constant；
The rate-determining steps are also used to work as T0Continue constant and judges that frosting degree constantly controls four lower than the second preset value
Port valve is commutated, terminates defrost.
Preferably,
The calculating step is also used to calculate real-time frosting degree, to judge whether frosting degree is small by the judgment step
In the second preset value；
And the calculating step includes function generator, the function generator can be used in calculating the fin surface
Frosting degree, and the functional relation of the frosting degree are as follows: η N=T0/(a2t1+b2T), 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor working temperature, and t is the operation of air-conditioning
Time, t0For the heating time of air-conditioning, a2And b2It is related with the heat efficiency of air-conditioning for constant.
A kind of air-conditioning defrosting device provided by the invention and control method have the following beneficial effects:
1. the present invention is by setting judgment module, for judging whether air-conditioning has begun frosting and judges that frosting degree is
It is no more than the first preset value；And control module, enter when air-conditioning has begun frosting and frosting degree is more than the first preset value
Defrost movement, can from air-conditioning, whether frosting and frosting degree two aspects judge air-conditioning with angle, thus
When air-conditioning frosting and frosting degree reach certain value (not interfering with the indoor heating effect of air-conditioning before the certain value)
The step of just starting defrost or movement avoid a large amount of frostings of fin surface and do not issue frosting instruction or fin to realize
The non-frosting in surface or frosting it is thin and carried out defrost and cause unnecessary defrost, influence air conditioning performance, efficiently solve
The problem of defrost judgement inaccuracy, for indoor occupant provides more preferably heating effect at the case where effectively avoiding accidentally defrost；
2. the present invention is by setting judgment module, for judging whether air-conditioning no longer frosting and has judged that frosting degree is
It is no less than the second preset value；And control module, it is also used to when air-conditioning no longer frosting and frosting degree is less than the second preset value
When enter terminate defrost movement, can from whether air-conditioning needs to stop frosting and frosting degree two in terms of with angle to air-conditioning
Judged, thus air-conditioning no longer frosting and frosting degree be less than reach certain value (will not shadow again below the certain value
Ring arrive the indoor heating effect of air-conditioning) when just starting stop defrost the step of or movement, thus realization avoid fin surface a large amount of
Frosting and issue the instruction for stopping defrost ahead of time or fin surface removed all frostings or remove most of frosting and
Stop defrost and lead to the stopping defrost of inaccuracy, influence air conditioning performance, has efficiently solved and stop defrost judgement not
Accurate problem, provides more preferably heating effect for indoor occupant at the case where effectively mistakenly stop being avoided to stop defrost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of air-conditioning defrosting device of the invention；
Fig. 2 is that the starting defrost of air-conditioning defrosting control method of the invention judges the flow chart of rate-determining steps；
Fig. 3 is that the defrost frosting of air-conditioning defrosting control method of the invention judges the flow chart of rate-determining steps.
Specific embodiment
As shown in Figure 1, the present invention provides a kind of air-conditioning defrosting device comprising:
Judgment module, for judging whether air-conditioning has begun frosting and judges whether frosting degree is default more than first
Value；
Control module enters defrost movement when air-conditioning has begun frosting and frosting degree is more than the first preset value.
The present invention is by setting judgment module, for judging whether air-conditioning has begun frosting and whether judge frosting degree
More than the first preset value；And control module, the entrance when air-conditioning has begun frosting and frosting degree is more than the first preset value
Frost movement, can from air-conditioning, whether frosting and frosting degree two aspects judge air-conditioning with angle, thus in sky
Ability when tune frosting and frosting degree reach certain value (not interfering with the indoor heating effect of air-conditioning before the certain value)
The step of starting defrost or movement avoid a large amount of frostings of fin surface and do not issue frosting instruction or fin table to realize
The non-frosting in face or frosting it is thin and carried out defrost and cause unnecessary defrost, influence air conditioning performance, efficiently solve
The problem of defrost judgement inaccuracy, effectively avoids the case where missing defrost, provides more preferably heating effect for indoor occupant.
Preferably,
It further include detection module, the real-time evaporating temperature T of the refrigerant for detecting outdoor heat exchanger1, and for detecting
The real-time defrost temperature T of fin surface2；
Further include computing module, is used for calculating difference T0=T1-T2,
Judgment module, wherein for judging whether air-conditioning has begun the judgement movement of frosting are as follows: for judging T0Whether
It is lasting to reduce；
The control module is also used to work as T0Control four-way valve is commutated, is acted into defrost when persistently reducing.
This is the further preferred structure type of defrosting device of the invention, that is, further includes detection module, can pass through inspection
Survey the real-time evaporating temperature T of refrigerant1And the real-time defrost temperature T of fin surface2, calculating difference T0=T1-T2, judgment module,
In for judge air-conditioning whether have begun frosting judgement movement are as follows: for judging T0Whether persistently reduce；Work as T0=T1-T2
Lasting reduce illustrates that fin surface starts to cover frost layer at this time, and the frost layer has obstructed the heat exchange between fin surface and air,
Therefore refrigerant can not exchange heat at fin with outdoor air, therefore script temperature difference T0=T1-T2It is very big at this time just gradually
Reduce, shows to have begun frosting；The execution movement of control module includes that four-way valve commutates, this execution movement needs base
In in T0It is lasting to reduce with frosting degree greater than the first preset value while in the case where meeting.T0Lasting reduce illustrates refrigerant in room
Heat transfer effect is deteriorated in external heat exchanger, the fin frosting of heat exchanger at this time.
Fig. 1 is defrosting control system block diagram of the invention.
The defrosting control APP of mobile phone can capture the image of outdoor heat exchanger fin in real time, by the image information of return into
The analysis of row data, is updated in function generator and is fitted referring to operating condition, heating efficiency, real-time frosting degree is obtained, according to frosting
Amount is named to start defrost, terminates defrost according to outdoor heat exchanger evaporating temperature and the difference of defrost temperature sensor after defrost
Name.
The instruction of handset emissions reaches defrosting device, and defrosting device starts defrost after receiving instruction, into defrost pattern,
I.e. the electromagnetism four-way reversing valve of air-conditioning compressor obtains electric, air-conditioning recycled back at this time, closes indoor unit blower, and compressor goes out
The high temperature and high pressure gas of mouth is directly entered outdoor heat exchanger, utilizes the high temperature and high pressure gas defrost of pipeline.
Fig. 2 is the control method that the air condition of that present invention enters defrost.
When air conditioner heat-production is run, defrost condition is met after fin frosting and then starts defrost judgement.Set outdoor heat exchanger
Evaporating temperature is T1, and defrost temperature sensor temperature is T2, difference: T0=T1-T2 < 3 DEG C, and T0 is persistently reduced, and illustrates to freeze
Agent heat transfer effect in outdoor heat exchanger is deteriorated, the fin frosting of heat exchanger at this time.
If meeting the above defrost condition, outdoor unit photographic device shoots the bidimensional image data of evaporator fin, passes through
WIFI sends the defrosting control APP of picture (or real-time imaging) to mobile phone, is simultaneously emitted by the tinkle of bells prompting；If being unsatisfactory for entering defrost
Condition then reenters defrost judgement；
People hear the tinkle of bells remind after, picture (or real-time imaging) is checked by mobile phone, by APP acquire picture (or in real time
Image) data analyzed afterwards, judge frosting situation, time, temperature, the pass between frosting degree are fitted using function generator
It is curve.
Preferably,
The computing module is also used to calculate real-time frosting degree, to judge whether frosting degree surpasses by the judgment module
Cross the first preset value；
And the computing module includes function generator, the function generator can be used in calculating the fin surface
Frosting degree, and the functional relation of the frosting degree are as follows: η N=(a1t1+b1T)/T0, 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, when t is the operation of air-conditioning
Between, t0For the heating time of air-conditioning, a1And b1It is related with the heat efficiency of air-conditioning for constant.As can be seen that when temperature difference T0 continues
Reduce, in the case where outdoor operating condition is constant, frosting degree persistently increases, and the defrost time is also grown.This is of the invention in frosting
Between section frosting degree preferred calculation method.By cell phone application control, (radio network gateway is connect with unit, is realized smart phone, is put down
The wireless telecommunications between smart machines and unit such as plate computer.Smart machine can realize the control to unit by gateway) whether
Into defrost；
If selection defrost, defrost instruction is issued by mobile phone, unit defrosting system control module receives after command signal then
It is run into defrost pattern.If selecting not defrost, mobile phone does not issue defrost instruction, then unit reenters defrost judgement；If limit
Interior (such as 3min or 5min) is fixed time without selection, then unit is run automatically into defrost pattern.
Preferably,
The judgment module, being also used to judge air-conditioning, whether the no longer frosting degree of frosting and judgement at this time is small
In the second preset value；
The control module is also used to when air-conditioning no longer frosting and when frosting degree is less than the second preset value enters end
The movement of defrost.
The present invention is by setting judgment module, for judging whether air-conditioning no longer frosting and judged frosting degree
Less than the second preset value；And control module, it is also used to when air-conditioning no longer frosting and when frosting degree is less than the second preset value
Into terminate defrost movement, can from whether air-conditioning needs to stop frosting and frosting degree two in terms of with angle to air-conditioning into
Row judgement, so that no longer frosting and frosting degree is less than and reaches certain value and (will not influence again below the certain value in air-conditioning
To the indoor heating effect of air-conditioning) when just starting stop defrost the step of or movement, thus realize avoid fin surface from largely tying
Frost and issue the instruction for stopping defrost ahead of time or fin surface removed all frostings or remove most of frosting and into
It has gone and has stopped defrost and lead to the stopping defrost of inaccuracy, influence air conditioning performance, it is inaccurate to efficiently solve stopping defrost judgement
True problem, provides more preferably heating effect for indoor occupant at the case where effectively mistakenly stop being avoided to stop defrost.
Preferably,
The real-time evaporating temperature T of refrigerant when including detection module, for detecting outdoor heat exchanger1, and for examining
Survey the real-time defrost temperature T of fin surface2；
And when including computing module, it to be used for calculating difference T0=T1-T2:
The judgment module, wherein for judging the air-conditioning whether no longer movement of frosting are as follows: for whether judging T0
Continue within a preset time constant；
The control module is also used to work as T0Control four-way valve is commutated, terminates defrost when continuing constant.
This is the further preferred structure type of defrosting device of the invention, i.e. judgment module, wherein for judging air-conditioning
The whether judgement movement of no longer frosting are as follows: for judging T0Whether continue constant；Work as T0=T1-T2It is persistently constant to illustrate this
When fin surface no longer frosting, and still whether frost layer size influences the also bad judgement of normally exchanging heat, and must need to pass through frost again
The size of layer or the size of frosting degree are judged that the execution movement of control module includes that four-way valve commutates, this execution
Movement is needed based in T0In the case where continuing constant and frosting degree less than the second preset value simultaneously satisfaction.T0 continues constant explanation
Refrigerant heat transfer effect in outdoor heat exchanger gradually improves, the fin of heat exchanger no longer frosting at this time (thickeing).
Fig. 3 is the control method that the air condition of that present invention terminates defrost.
When air conditioner defrost is run, defrost judgement is carried out based on common defrost finishing control method；
When defrost carries out, set outdoor heat exchanger evaporating temperature as T1, defrost temperature sensor temperature is T2, difference:
T0=T1-T2 < 2 DEG C, and T0 persistently maintains a period of time (such as 3min or 5min) to remain unchanged, and illustrates outdoor heat exchanger table
Face cream melting layer is completed and white water evaporating completely is clean, need to terminate defrost program.
If meeting defrost termination condition, outdoor unit photographic device shoots the bidimensional image data of evaporator fin, passes through
WIFI sends the defrosting control APP of picture (or real-time imaging) to mobile phone, is simultaneously emitted by the tinkle of bells prompting；If being unsatisfactory for entering defrost
Condition, then reentering defrost terminates to judge；
After people hears that the tinkle of bells is reminded, the number analyzed afterwards by APP acquisition picture (or real-time imaging) is checked by mobile phone
According to judging whether defrost is clean, fit time, temperature, the relation curve between frosting degree using function generator, and pass through
Cell phone application controls whether to terminate defrost.
Preferably,
The computing module is also used to calculate real-time frosting degree, to judge whether frosting degree is small by the judgment module
In the second preset value；
And the computing module includes function generator, the function generator can be used in calculating the fin surface
Frosting degree, and the functional relation of the frosting degree are as follows: η N=T0/(a2t1+b2T), 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, when t is the operation of air-conditioning
Between, t0For the heating time of air-conditioning, a2And b2It is related with the heat efficiency of air-conditioning for constant.As can be seen that when temperature difference T0 is maintained
When constant, in the case where outdoor operating condition is constant, the defrost time is long, and remaining frosting degree is few.This is of the invention in defrost
Between section frosting degree preferred calculation method.By cell phone application control, (radio network gateway is connect with unit, is realized smart phone, is put down
The wireless telecommunications between smart machines and unit such as plate computer.Smart machine can realize the control to unit by gateway) whether
Stop defrost；
If selection terminates defrost, being issued by mobile phone terminates defrost instruction, and unit defrosting system control module receives instruction
Signal backed off after random defrost pattern simultaneously enters heating operation mode；If selection does not terminate defrost, unit, which reenters defrost, to be terminated
Judgement；If unit automatically exits from defrost pattern and enters heating operation mode without selection in limiting time.
The present invention also provides a kind of air-conditioning defrosting control methods, use preceding described in any item air-conditioning defrosting devices, and
Further include:
Judgment step, for judging whether air-conditioning has begun frosting and judges whether frosting degree is default more than first
Value；
Rate-determining steps enter defrost movement when air-conditioning has begun frosting and frosting degree is more than the first preset value.
The present invention is by setting judgment module, for judging whether air-conditioning has begun frosting and whether judge frosting degree
More than the first preset value；And control module, the entrance when air-conditioning has begun frosting and frosting degree is more than the first preset value
Frost movement, can from air-conditioning, whether frosting and frosting degree two aspects judge air-conditioning with angle, thus in sky
Ability when tune frosting and frosting degree reach certain value (not interfering with the indoor heating effect of air-conditioning before the certain value)
The step of starting defrost or movement avoid a large amount of frostings of fin surface and do not issue frosting instruction or fin table to realize
The non-frosting in face or frosting it is thin and carried out defrost and cause unnecessary defrost, influence air conditioning performance, efficiently solve
The problem of defrost judgement inaccuracy, effectively avoids the case where missing defrost, provides more preferably heating effect for indoor occupant.
Preferably,
It further include detecting step, the real-time evaporating temperature T of the refrigerant for detecting outdoor heat exchanger1, and for detecting
The real-time defrost temperature T of fin surface2；
Further include calculating step, is used for calculating difference T0=T1-T2,
Judgment step, wherein for judging whether air-conditioning has begun the judgement movement of frosting are as follows: for whether judging T0
It is lasting to reduce；
The rate-determining steps are also used to work as T0Control four-way valve is commutated, is acted into defrost when persistently reducing.
This is the further preferred structure type of defrosting device of the invention, that is, further includes detection module, can pass through inspection
Survey the real-time evaporating temperature T of refrigerant1And the real-time defrost temperature T of fin surface2, calculating difference T0=T1-T2, judgment module,
In for judge air-conditioning whether have begun frosting judgement movement are as follows: for judging T0Whether persistently reduce；Work as T0=T1-T2
Lasting reduce illustrates that fin surface starts to cover frost layer at this time, and the frost layer has obstructed the heat exchange between fin surface and air,
Therefore refrigerant can not exchange heat at fin with outdoor air, therefore script temperature difference T0=T1-T2It is very big at this time just gradually
Reduce, shows to have begun frosting；The execution movement of control module includes that four-way valve commutates, this execution movement needs base
In in T0It is lasting to reduce with frosting degree greater than the first preset value while in the case where meeting.T0Lasting reduce illustrates refrigerant in room
Heat transfer effect is deteriorated in external heat exchanger, the fin frosting of heat exchanger at this time.
Fig. 1 is defrosting control system block diagram of the invention.
The defrosting control APP of mobile phone can capture the image of outdoor heat exchanger fin in real time, by the image information of return into
The analysis of row data, is updated in function generator and is fitted referring to operating condition, heating efficiency, real-time frosting degree is obtained, according to frosting
Amount is named to start defrost, terminates defrost according to outdoor heat exchanger evaporating temperature and the difference of defrost temperature sensor after defrost
Name.
The instruction of handset emissions reaches defrosting device, and defrosting device starts defrost after receiving instruction, into defrost pattern,
I.e. the electromagnetism four-way reversing valve of air-conditioning compressor obtains electric, air-conditioning recycled back at this time, closes indoor unit blower, and compressor goes out
The high temperature and high pressure gas of mouth is directly entered outdoor heat exchanger, utilizes the high temperature and high pressure gas defrost of pipeline.
Fig. 2 is the control method that the air condition of that present invention enters defrost.
When air conditioner heat-production is run, defrost condition is met after fin frosting and then starts defrost judgement.Set outdoor heat exchanger
Evaporating temperature is T1, and defrost temperature sensor temperature is T2, difference: T0=T1-T2 < 3 DEG C, and T0 is persistently reduced, and illustrates to freeze
Agent heat transfer effect in outdoor heat exchanger is deteriorated, the fin frosting of heat exchanger at this time.
If meeting the above defrost condition, outdoor unit photographic device shoots the bidimensional image data of evaporator fin, passes through
WIFI sends the defrosting control APP of picture (or real-time imaging) to mobile phone, is simultaneously emitted by the tinkle of bells prompting；If being unsatisfactory for entering defrost
Condition then reenters defrost judgement；
People hear the tinkle of bells remind after, picture (or real-time imaging) is checked by mobile phone, by APP acquire picture (or in real time
Image) data analyzed afterwards, judge frosting situation, time, temperature, the pass between frosting degree are fitted using function generator
It is curve.
Preferably,
The calculating step is also used to calculate real-time frosting degree, to judge whether frosting degree surpasses by the judgment step
Cross the first preset value；
And the calculating step includes function generator, the function generator can be used in calculating the fin surface
Frosting degree, and the functional relation of the frosting degree are as follows: η N=(a1t1+b1T)/T0,0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, when t is the operation of air-conditioning
Between, t0For the heating time of air-conditioning, a1And b1It is related with the heat efficiency of air-conditioning for constant.As can be seen that when temperature difference T0 continues
Reduce, in the case where outdoor operating condition is constant, frosting degree persistently increases, and the defrost time is also grown.This is of the invention in frosting
Between section frosting degree preferred calculation method.By cell phone application control, (radio network gateway is connect with unit, is realized smart phone, is put down
The wireless telecommunications between smart machines and unit such as plate computer.Smart machine can realize the control to unit by gateway) whether
Into defrost；
If selection defrost, defrost instruction is issued by mobile phone, unit defrosting system control module receives after command signal then
It is run into defrost pattern.If selecting not defrost, mobile phone does not issue defrost instruction, then unit reenters defrost judgement；If limit
Interior (such as 3min or 5min) is fixed time without selection, then unit is run automatically into defrost pattern.
Preferably,
The judgment step, being also used to judge air-conditioning, whether the no longer frosting degree of frosting and judgement at this time is small
In the second preset value；
The rate-determining steps are also used to when air-conditioning no longer frosting and when frosting degree is less than the second preset value enters end
The movement of defrost.
The present invention is by setting judgment step, for judging whether air-conditioning no longer frosting and judged frosting degree
Less than the second preset value；And control module, it is also used to when air-conditioning no longer frosting and when frosting degree is less than the second preset value
Into terminate defrost movement, can from whether air-conditioning needs to stop frosting and frosting degree two in terms of with angle to air-conditioning into
Row judgement, so that no longer frosting and frosting degree is less than and reaches certain value and (will not influence again below the certain value in air-conditioning
To the indoor heating effect of air-conditioning) when just starting stop defrost the step of or movement, thus realize avoid fin surface from largely tying
Frost and issue the instruction for stopping defrost ahead of time or fin surface removed all frostings or remove most of frosting and into
It has gone and has stopped defrost and lead to the stopping defrost of inaccuracy, influence air conditioning performance, it is inaccurate to efficiently solve stopping defrost judgement
True problem, provides more preferably heating effect for indoor occupant at the case where effectively mistakenly stop being avoided to stop defrost.
Preferably,
The real-time evaporating temperature T of refrigerant when including detecting step, for detecting outdoor heat exchanger1, and for examining
Survey the real-time defrost temperature T of fin surface2；
And when including calculating step, it to be used for calculating difference T0=T1-T2:
The judgment step, wherein for judging the air-conditioning whether no longer movement of frosting are as follows: for judging T0Whether
Continue within a preset time constant；
The rate-determining steps are also used to work as T0Control four-way valve is commutated, terminates defrost when continuing constant.
This is the further preferred structure type of defrosting device of the invention, i.e. judgment module, wherein for judging air-conditioning
The whether judgement movement of no longer frosting are as follows: for judging T0Whether continue constant；Work as T0=T1-T2It is persistently constant to illustrate this
When fin surface no longer frosting, and still whether frost layer size influences the also bad judgement of normally exchanging heat, and must need to pass through frost again
The size of layer or the size of frosting degree are judged that the execution movement of control module includes that four-way valve commutates, this execution
Movement is needed based in T0In the case where continuing constant and frosting degree less than the second preset value simultaneously satisfaction.T0 continues constant explanation
Refrigerant heat transfer effect in outdoor heat exchanger gradually improves, the fin of heat exchanger no longer frosting at this time (thickeing).
Fig. 3 is the control method that the air condition of that present invention terminates defrost.
When air conditioner defrost is run, defrost judgement is carried out based on common defrost finishing control method；
When defrost carries out, set outdoor heat exchanger evaporating temperature as T1, defrost temperature sensor temperature is T2, difference:
T0=T1-T2 < 2 DEG C, and T0 persistently maintains a period of time (such as 3min or 5min) to remain unchanged, and illustrates outdoor heat exchanger table
Face cream melting layer is completed and white water evaporating completely is clean, need to terminate defrost program.
If meeting defrost termination condition, outdoor unit photographic device shoots the bidimensional image data of evaporator fin, passes through
WIFI sends the defrosting control APP of picture (or real-time imaging) to mobile phone, is simultaneously emitted by the tinkle of bells prompting；If being unsatisfactory for entering defrost
Condition, then reentering defrost terminates to judge；
After people hears that the tinkle of bells is reminded, the number analyzed afterwards by APP acquisition picture (or real-time imaging) is checked by mobile phone
According to judging whether defrost is clean, fit time, temperature, the relation curve between frosting degree using function generator, and pass through
Cell phone application controls whether to terminate defrost.
Preferably,
The calculating step is also used to calculate real-time frosting degree, to judge whether frosting degree is small by the judgment step
In the second preset value；
And the calculating step includes function generator, the function generator can be used in calculating the fin surface
Frosting degree, and the functional relation of the frosting degree are as follows: η N=T0/(a2t1+b2T), 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, and t1 is the defrost time, and T is outdoor operating condition, when t is the operation of air-conditioning
Between, t0For the heating time of air-conditioning, a2And b2It is related with the heat efficiency of air-conditioning for constant.As can be seen that when temperature difference T0 is maintained
When constant, in the case where outdoor operating condition is constant, the defrost time is long, and remaining frosting degree is few.This is of the invention in defrost
Between section frosting degree preferred calculation method.By cell phone application control, (radio network gateway is connect with unit, is realized smart phone, is put down
The wireless telecommunications between smart machines and unit such as plate computer.Smart machine can realize the control to unit by gateway) whether
Stop defrost；
If selection terminates defrost, being issued by mobile phone terminates defrost instruction, and unit defrosting system control module receives instruction
Signal backed off after random defrost pattern simultaneously enters heating operation mode；If selection does not terminate defrost, unit, which reenters defrost, to be terminated
Judgement；If unit automatically exits from defrost pattern and enters heating operation mode without selection in limiting time.
Alternate embodiment
The present invention also shoots bidimensional image data using photographic device possessed by air-conditioner outdoor unit, and indoor occupant passes through
Image data judges frosting and defrost situation, is fitted frosting situation curve using the function generator in mobile phone defrosting control APP,
The case where carrying out defrost according to frosting degree or terminating defrosting operation, effectively avoid accidentally defrost, provides for interior people and more preferably makes
Thermal effect.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.With
It is only the preferred embodiment of the present invention described in upper, it is noted that for those skilled in the art, not
Under the premise of being detached from the technology of the present invention principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as this
The protection scope of invention.
Claims (12)
1. a kind of air-conditioning defrosting device, it is characterised in that: include:
Judgment module, for judging whether air-conditioning has begun frosting and judge frosting degree whether more than the first preset value；
Control module enters defrost movement when air-conditioning has begun frosting and frosting degree is more than the first preset value.
2. air-conditioning defrosting device according to claim 1, it is characterised in that:
It further include detection module, the real-time evaporating temperature T of the refrigerant for detecting outdoor heat exchanger1, and for detecting fin table
The real-time defrost temperature T in face2；
Further include computing module, is used for calculating difference T0=T1-T2,
Judgment module, wherein for judging whether air-conditioning has begun the judgement movement of frosting are as follows: for judging T0Whether persistently subtract
It is few；
The control module is also used to work as T0It is lasting reduce and judge to control when frosting degree is more than the first preset value four-way valve into
Row commutation is acted into defrost.
3. air-conditioning defrosting device according to claim 2, it is characterised in that:
Whether the computing module is also used to calculate real-time frosting degree, to judge frosting degree more than the by the judgment module
One preset value；
And the computing module includes function generator, the function generator can be used in calculating the frosting of the fin surface
Amount, and the functional relation of the frosting degree are as follows: η N=(a1t1+b1T)/T0, 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, and t is the runing time of air-conditioning, t0For
The heating time of air-conditioning, a1And b1It is related with the heat efficiency of air-conditioning for constant.
4. air-conditioning defrosting device according to any one of claim 1-3, it is characterised in that:
The judgment module, be also used to judge air-conditioning whether no longer frosting and judgement frosting degree at this time whether less than the
Two preset values；
The control module is also used to when air-conditioning no longer frosting and when frosting degree is less than the second preset value enters end defrost
Movement.
5. air-conditioning defrosting device according to claim 4, it is characterised in that:
The real-time evaporating temperature T of refrigerant when including detection module, for detecting outdoor heat exchanger1, and for detecting fin
The real-time defrost temperature T on surface2；
And when including computing module, it to be used for calculating difference T0=T1-T2:
The judgment module, wherein for judging the air-conditioning whether no longer movement of frosting are as follows: for judging T0 whether pre-
If continuing in the time constant；
The control module is also used to work as T0Continue constant and while judge frosting degree lower than the second preset value control four-way valve into
Row commutation terminates defrost.
6. air-conditioning defrosting device according to claim 5, it is characterised in that:
Whether the computing module is also used to calculate real-time frosting degree, to judge frosting degree less than the by the judgment module
Two preset values；
And the computing module includes function generator, the function generator can be used in calculating the frosting of the fin surface
Amount, and the functional relation of the frosting degree are as follows: η N=T0/(a2t1+b2T), 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, and t is the runing time of air-conditioning, t0For
The heating time of air-conditioning, a2And b2It is related with the heat efficiency of air-conditioning for constant.
7. a kind of air-conditioning defrosting control method, it is characterised in that: filled using the air-conditioning defrost of any of claims 1-6
It sets, and further include:
Judgment step, for judging whether air-conditioning has begun frosting and judge frosting degree whether more than the first preset value；
Rate-determining steps enter defrost movement when air-conditioning has begun frosting and frosting degree is more than the first preset value.
8. air-conditioning defrosting control method according to claim 7, it is characterised in that:
It further include detecting step, the real-time evaporating temperature T of the refrigerant for detecting outdoor heat exchanger1, and for detecting fin table
The real-time defrost temperature T in face2；
Further include calculating step, is used for calculating difference T0=T1-T2,
Judgment step, wherein for judging whether air-conditioning has begun the judgement movement of frosting are as follows: for judging whether T0 continues
It reduces；
The rate-determining steps are also used to work as T0It is lasting reduce and judge to control when frosting degree is more than the first preset value four-way valve into
Row commutation is acted into defrost.
9. air-conditioning defrosting control method according to claim 8, it is characterised in that:
Whether the calculating step is also used to calculate real-time frosting degree, to judge frosting degree more than by the judgment step
One preset value；
And the calculating step includes function generator, the function generator can be used in calculating the frosting of the fin surface
Amount, and the functional relation of the frosting degree are as follows: η N=(a1t1+b1T)/T0,0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, t1For the defrost time, T is outdoor operating condition, and t is the runing time of air-conditioning, t0For
The heating time of air-conditioning, a1And b1It is related with the heat efficiency of air-conditioning for constant.
10. the air-conditioning defrosting control method according to any one of claim 7-9, it is characterised in that:
The judgment step, be also used to judge air-conditioning whether no longer frosting and judgement frosting degree at this time whether less than the
Two preset values；
The rate-determining steps are also used to when air-conditioning no longer frosting and when frosting degree is less than the second preset value enters end defrost
Movement.
11. air-conditioning defrosting control method according to claim 10, it is characterised in that:
The real-time evaporating temperature T of refrigerant when including detecting step, for detecting outdoor heat exchanger1, and for detecting fin
The real-time defrost temperature T on surface2；
And when including calculating step, it to be used for calculating difference T0=T1-T2:
The judgment step, wherein for judging the air-conditioning whether no longer movement of frosting are as follows: for judging T0Whether default
Continue in time constant；
The rate-determining steps are also used to work as T0Continue constant and judges that frosting degree constantly controls four-way valve lower than the second preset value
It commutated, terminate defrost.
12. air-conditioning defrosting device according to claim 11, it is characterised in that:
Whether the calculating step is also used to calculate real-time frosting degree, to judge frosting degree less than by the judgment step
Two preset values；
And the calculating step includes function generator, the function generator can be used in calculating the frosting of the fin surface
Amount, and the functional relation of the frosting degree are as follows: η N=T0/(a2t1+b2T), 0 < T0< 3 DEG C, t=t0+t1；
In formula, η is heating efficiency, and N is frosting degree, and t1 is the defrost time, and T is outdoor operating condition, and t is the runing time of air-conditioning, t0For
The heating time of air-conditioning, a2And b2It is related with the heat efficiency of air-conditioning for constant.
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| CN201811554303.2A CN109882994A (en) | 2018-12-18 | 2018-12-18 | Air conditioner defrosting device and control method |
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| CN114061106A (en) * | 2021-11-24 | 2022-02-18 | 美的集团武汉制冷设备有限公司 | Control method, device and equipment of air conditioning system and storage medium |
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