CN106931694A - Method, device, heat pump and air-conditioning for defrost - Google Patents
Method, device, heat pump and air-conditioning for defrost Download PDFInfo
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- CN106931694A CN106931694A CN201710236191.5A CN201710236191A CN106931694A CN 106931694 A CN106931694 A CN 106931694A CN 201710236191 A CN201710236191 A CN 201710236191A CN 106931694 A CN106931694 A CN 106931694A
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- Prior art keywords
- defrost
- afterwards
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- time
- threshold
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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
- 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
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/023—Set point defrosting
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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
- F25B2600/00—Control issues
- F25B2600/01—Timing
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2103—Temperatures near a heat exchanger
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The embodiment of the present invention provides a kind of method for defrost, device and air-conditioning, belongs to field of air conditioning.Methods described judges whether previous defrost is clean；In the case of previous defrost is sordid, increase the time threshold that defrost is exited described in the temperature threshold and/or increase for exiting defrost；In the case where the outlet refrigerant temperature of the outer machine heat exchanger of system is not less than the temperature threshold for exiting defrost after increasing or in the case of the time threshold for exiting defrost that the defrost time for being used is not less than after increasing, the system is controlled to exit defrost.In the case of previous defrost is sordid, dynamically it is provided for exiting the temperature threshold or time threshold of defrost so that defrost is more intelligent.
Description
Technical field
The present invention relates to field of air conditioning, more particularly to the method for defrost, device, heat pump and air-conditioning.
Background technology
Air-conditioning system and heat pump understand frosting in low temperature environment long-play, if during the defrost of defrost exit criteria
Between and defrost exit that temperature setting is improper, it is unclean to may result in defrost each time, and frost is more long-pending thicker on condenser, so that significantly
Machine capability is reduced, influence machine is normally used.
In the prior art, when system reaches defrost condition into defrost, system defrost exit criteria is all according to survey in the past
Test result setting, temperature exits temperature higher than the defrost of setting during reaching fixed defrost time or defrost, then exit
Defrost.But existing control method is not intelligent enough, in the case of defrost is sordid, the defrost time can not be according to actual feelings
Condition extends, and temperature is exited in the defrost of setting can not be improved to extend the defrost time according to actual conditions, thus can be caused cold
Frost is more long-pending thicker on condenser.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of method for defrost, device and air-conditioning, for solving or extremely
Small part solves above-mentioned technological deficiency.
To achieve these goals, the embodiment of the present invention provides a kind of method for defrost, and the method includes：Judge first
Whether preceding defrost is clean；In the case of previous defrost is sordid, increases and moved back described in the temperature threshold and/or increase for exiting defrost
Go out the time threshold of defrost；And the temperature for exiting defrost after the outlet refrigerant temperature of the outer machine heat exchanger of system is not less than increase
In the case of degree threshold value or in the case where the defrost time for being used is not less than the time threshold for exiting defrost after increasing,
The system is controlled to exit defrost.
Correspondingly, the embodiment of the present invention also provides a kind of device for defrost, and described device includes：First judges mould
Block, for judging whether previous defrost is clean；Threshold setting module, in the case of previous defrost is sordid, increase to be moved back
Go out the temperature threshold of defrost and/or exit the time threshold of defrost described in increasing；And defrosting control module is exited, for being
In the case that the outlet refrigerant temperature of the outer machine heat exchanger of system is not less than the temperature threshold for exiting defrost after increase or made
In the case that the defrost time is not less than the time threshold for exiting defrost after increasing, the system is controlled to exit defrost.
Correspondingly, the embodiment of the present invention also provides a kind of air-conditioning, and the air-conditioning includes the above-mentioned device for defrost.
Correspondingly, the embodiment of the present invention also provides a kind of heat pump, and the air-conditioning includes the above-mentioned device for defrost.
By above-mentioned technical proposal, the temperature for being dynamically provided for exiting defrost by judging previous defrost whether totally to come
Degree threshold value or time threshold, so that solve to cause the sordid problem that defrosts because setting defrost exit criteria is improper, and solution
Certainly system defrost exit criteria fixes not intelligentized problem in the prior art.
The further feature and advantage of the embodiment of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is the embodiment of the present invention to be further understood for providing, and constitutes a part for specification, with
The specific embodiment in face is used to explain the embodiment of the present invention together, but does not constitute the limitation to the embodiment of the present invention.Attached
In figure：
Fig. 1 shows the flow chart of the method for defrost according to an embodiment of the invention；And
Fig. 2 shows the block diagram of the device for defrost according to an embodiment of the invention.
Specific embodiment
The specific embodiment of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this
The described specific embodiment in place is merely to illustrate and explain the present invention embodiment, is not intended to limit the invention embodiment.
The embodiment of the present invention provides a kind of method for defrost, and the method can include：Judge whether previous defrost is done
Only；In the case of previous defrost is sordid, increase the time that defrost is exited described in the temperature threshold and/or increase for exiting defrost
Threshold value；In the case where the outlet refrigerant temperature of the outer machine heat exchanger of system is not less than the temperature threshold for exiting defrost after increasing or
Person controls the system to exit in the case where the defrost time for being used is not less than the time threshold for exiting defrost after increasing
Defrost.The method is dynamically provided for exiting the temperature threshold or time threshold of defrost in the case of previous defrost is sordid
Value so that defrost is more intelligent.
Previous defrost does not refer to totally that defrost is not changed totally after the completion of last time defrost in the embodiment of the present invention, previous defrost
Clean refers to that defrost is clean after the completion of last time defrost.
Fig. 1 shows the flow chart of the method for defrost according to an embodiment of the invention.As shown in figure 1, of the invention
One embodiment provides a kind of method for defrost, and the method may comprise steps of：
Step S10, starts to perform defrost.When air-conditioning system or heat pump meet defrost condition, will automatically begin to perform
Defrost.
Whether step S11, when system starts to perform defrost, first determine whether currently to carry out the frequency n of defrost more than default
Number of times.The value of the preset times is preferably not less than 2.
Step S12, in the case where the current frequency n for carrying out defrost is not more than the preset times, will move out
The temperature threshold of frost is set to TN afterwards=T0And will move out the time threshold of defrost and be set to tN afterwards=t0.In the embodiment of the present invention
In, TN afterwardsTo carry out the temperature threshold for exiting defrost set during n-th defrost, T0It is the temperature threshold of initial setting, it can
To be configured according to actual needs, tN afterwardsTo carry out the time threshold for exiting defrost set during n-th defrost, t0For initial
The time threshold of setting, it can be configured according to actual needs.
Step S13, in the case where the current frequency n for carrying out defrost is more than the preset times, judges previousization
Whether frost is clean.
Step S14, in the case where previous defrost is clean, T is set to by the temperature threshold for exiting defrostN afterwards=
TAfterwards (n-1)And the time threshold for exiting defrost is set to tN afterwards=tAfterwards (n-1), in an embodiment of the present invention, TAfterwards (n-1)For
The set temperature threshold for exiting defrost, t when carrying out (n-1)th defrostAfterwards (n-1)It is set during (n-1)th defrost to carry out
Exit the time threshold of defrost.That is, check defrost it is clean in the case of, by the exiting set by this defrost
Ice-lolly part be set to set by last time defrost to exit defrost condition identical.
Step S15, in the case of previous defrost is sordid, T is set to by the temperature threshold for exiting defrostN afterwards=
TAfterwards (n-1)+ △ T and the time threshold for exiting defrost is set to tN afterwards=tAfterwards (n-1)+ △ t, in an embodiment of the present invention,
△ T are set temperature increase, and △ t are set time value added.Alternatively, set temperature increase △ T
Scope can be 0.5 DEG C to 5 DEG C, and alternatively, the scope of set time value added △ t is 0.5 minute to 5 points
Clock.
Alternatively, the temperature threshold that defrost is exited in increase in the embodiment of the present invention can also be the temperature threshold in initial setting
Increase by a fixed value on the basis of value, or increase that to exit the time threshold of defrost can also be time threshold in initial setting
On the basis of increase by a fixed value.
Step S16, after any in execution of step S12, S14 or S15 is with step, control system starts defrost.
Step S17, judges the outlet refrigerant temperature T of the outer machine heat exchanger of systemGo out nWhether exited more than or equal to set
The temperature threshold T of defrostN afterwardsOr whether the defrost time t for being used is more than or equal to the set time threshold for exiting defrost
Value tN afterwards。
Step S17, in the outlet refrigerant temperature T of the outer machine heat exchanger of systemGo out nDefrost is exited more than or equal to set
Temperature threshold TN afterwardsIn the case of or in the defrost time t for being used more than or equal to the set time threshold for exiting defrost
Value tN afterwardsIn the case of, illustrate that exiting defrost condition is satisfied, then control the system to exit defrost.
In the outlet refrigerant temperature T of the outer machine heat exchanger of systemGo out nLess than the set temperature threshold T for exiting defrostN afterwardsFeelings
Less than the set time threshold t for exiting defrost under condition and in the defrost time t for being usedN afterwardsIn the case of, explanation is exited
Defrost condition is not satisfied, then continue executing with defrost.
In embodiments of the present invention, the number of times of defrost is currently being carried out more than preset times and is judging that previous defrost is not done
In the case of net, then compared with last time defrost, the temperature threshold of defrost is exited in increase and the time threshold of defrost is exited in increase,
And then come that frostization is clean defrost total time essentially by dynamically extension.
Further, judge whether previous defrost can totally include：The outer machine when the system enters defrost the n-th -2 times
The refrigerant inlet temperature T of heat exchangerEnter (n-2)The refrigerant inlet temperature of outer machine heat exchanger when entering defrost for (n-1)th time time with the system
Degree TEnter (n-1)Between difference A less than in the case of predetermined value, judge that previous defrost is clean；And enter for the n-th -2 times in the system
Enter the refrigerant inlet temperature T of outer machine heat exchanger during defrostEnter (n-2)Outer machine heat exchanger when entering defrost for (n-1)th time time with the system
Refrigerant inlet temperature TEnter (n-1)Between difference not less than in the case of predetermined value A, judge that previous defrost is not clean, now need
Change the condition for exiting defrost.Here, n is positive integer, and the value of n is more than 2.Preferably, the span of predetermined value A is 1
DEG C to 10 DEG C.It is alternatively possible to when defrost is carried out every time, temperature in use sensor detects the refrigerant inlet temperature of outer machine heat exchanger
Degree.By judging whether the difference previously twice when defrost between the refrigerant inlet temperature of outer machine heat exchanger is more than or equal to
Predetermined value, can fast and effeciently judge whether previous defrost is clean.
Alternatively, after system is powered every time, again from 1 start recording defrost number of times.
Further, in embodiments of the present invention, it is alternatively possible to temperature in use sensor comes to the outer machine heat exchanger of system
Outlet refrigerant temperature and inlet temperature measure.
Below will be provided in an embodiment of the present invention for defrost to be further illustrated with set preset times as 2
Method.
First time defrost is carried out after system energization：When defrost, the refrigerant inlet temperature of outer machine heat exchanger is detected
TEnter 1, and will move out defrost condition setting and be：The outlet refrigerant temperature T of the outer machine heat exchanger of system for being detectedGo out 1≥TAfterwards 1Or institute
The defrost time t >=t for usingAfterwards 1When control system release defrost, here, TAfterwards 1=T0, tAfterwards 1=t0.In embodiments of the present invention,
TAfterwards 1To carry out the temperature threshold for exiting defrost set during the 1st defrost, tAfterwards 1It is set during the 1st defrost to carry out
The time threshold for exiting defrost, T0It is the temperature threshold of initial setting, t0It is the time threshold of initial setting.
Second defrost：When defrost, the refrigerant inlet temperature T of outer machine heat exchanger is detectedEnter 2, and will move out defrost bar
Part is set to：The outlet refrigerant temperature T of the outer machine heat exchanger of system for being detectedGo out 2≥TAfterwards 2Or the defrost time t for being used >=
tAfterwards 2When control system release defrost, here, TAfterwards 2=T0, tAfterwards 2=t0.In embodiments of the present invention, TAfterwards 2To carry out the 2nd change
The set temperature threshold for exiting defrost, t when whiteAfterwards 2To carry out the time threshold for exiting defrost set during the 2nd defrost
Value, T0It is the temperature threshold of initial setting, t0It is the time threshold of initial setting.
Third time defrost：Judge whether previous defrost is clean since third time defrost.If the T for being detectedEnter 1-TEnter 2≥
A, illustrates that previously defrosting does not totally exit defrost condition, it is necessary to change, and otherwise illustrates that previously defrosting is clean, and A can basis here
Actual conditions and set, it is preferable that the span of A is 1 DEG C to 10 DEG C.
When defrost, the refrigerant inlet temperature T of outer machine heat exchanger is detectedEnter 3If previously defrosting was not clean, will move back
Going out defrost condition setting is：The outlet refrigerant temperature T of the outer machine heat exchanger of system for being detectedGo out 3≥TAfterwards 3Or the defrost for being used
Time t >=tAfterwards 3, it is provided with TAfterwards 3=TAfterwards 2+ △ T, and t is setAfterwards 3=t2+ afterwards△ t, it is preferable that the span of △ T can be
0.5 DEG C to 5 DEG C, the span of △ t can be 0.5 minute to 5 minutes.If previously defrosting is not clean, defrost is will move out
Condition setting is：The outlet refrigerant temperature T of the outer machine heat exchanger of system for being detectedGo out 3≥TAfterwards 3Or the defrost time t for being used >=
tAfterwards 3, it is provided with TAfterwards 3=TAfterwards 2, and t is setAfterwards 3=tAfterwards 2, in embodiments of the present invention, TAfterwards 3To carry out the 3rd defrost when institute
The temperature threshold for exiting defrost for setting, tAfterwards 3To carry out the time threshold for exiting defrost set during the 3rd defrost, △ T
It is set temperature increase, △ t are set time value added.
The like, when performing N+2 defrost, if TEnter N-TEnter (N+1)>=A, then exit defrost by the N+2 times defrost
Condition setting is：The outlet refrigerant temperature T of the outer machine heat exchanger of system for being detectedGo out (N+2)≥TAfterwards (N+2)Or the defrost for being used
Time t >=tAfterwards (N+2), it is provided with TAfterwards (N+2)=TAfterwards (N+1)+ △ T and setting tAfterwards (N+2)=tAfterwards (N+1)+△t；Otherwise, exit criteria
For：The outlet refrigerant temperature T of the outer machine heat exchanger of system for being detectedGo out (N+2)≥TAfterwards (N+2)Or the defrost time t for being used >=
tAfterwards (N+2), it is provided with TAfterwards (N+2)=TAfterwards (N+1)And t is setAfterwards (N+2)=tAfterwards (N+1).Wherein, N is positive integer, and N value be more than or
Equal to 1, TEnter NTo perform the refrigerant inlet temperature of outer machine heat exchanger during n-th defrost, TEnter (N+1)To perform outside during the N+1 times defrost
The refrigerant inlet temperature of machine heat exchanger, TAfterwards (N+2)To carry out the temperature threshold for exiting defrost set during the N+2 times defrost,
TAfterwards (N+1)To carry out the temperature threshold for exiting defrost set during the N+1 times defrost, tAfterwards (N+2)To carry out this N+2 times change
The set time threshold for exiting defrost, t when whiteAfterwards (N+1)For carry out during the N+1 times defrost it is set exit defrost when
Between threshold value.
In embodiments of the present invention, if the refrigerant inlet temperature of outer machine heat exchanger is determined previously during according to previous defrost
Defrost is not clean, then the condition setting for exiting defrost is：The set temperature threshold for exiting defrost is than set by last defrost
The temperature threshold put increases △ T and the set time threshold for exiting defrost increases △ t than last, so that by extension
Come that frostization is clean defrost total time, cause that defrost is more intelligent compared with prior art.
Fig. 2 shows the block diagram of the device 20 for defrost according to an embodiment of the invention.As shown in Fig. 2 of the invention
Embodiment also provides a kind of device 20 for defrost, and the device can include：First judge module 21, for judging previousization
Whether frost is clean；Threshold setting module 22, in the case of previous defrost is sordid, the temperature threshold of defrost to be exited in increase
And/or the time threshold of defrost is exited described in increasing；Defrosting control module 23 is exited, for the refrigerant in the outer machine heat exchanger of system
It is not less than in the case that outlet temperature is not less than the temperature threshold for exiting defrost after increasing or in the defrost time for being used
In the case of the time threshold for exiting defrost after increase, the system is controlled to exit defrost.
Alternatively, whether device 20 can also include the second judge module, big for judging the frequency n for currently carrying out defrost
In preset times, it is alternatively possible to after system is powered every time, the number of times of defrost be calculated since 1 again；The threshold value is set
Module 22 is additionally operable to, in the case where the frequency n for currently carrying out defrost is not more than the preset times, will move out the temperature of defrost
Threshold value is set to TN afterwards=T0And will move out the time threshold of defrost and be set to tN afterwards=t0；First judge module 21 is used for
In the case where the current frequency n for carrying out defrost is more than the preset times, judge whether previous defrost is clean, the threshold
Value setup module 22 is additionally operable to：In the case where previous defrost is clean, the temperature threshold for exiting defrost is set to TN afterwards=
TAfterwards (n-1)And the time threshold for exiting defrost is set to tN afterwards=tAfterwards (n-1)；In the case of previous defrost is sordid, will
The temperature threshold for exiting defrost is set to TN afterwards=TAfterwards (n-1)+ △ T and the time threshold for exiting defrost is set to
tN afterwards=tAfterwards (n-1)+△t；Defrosting control module 23 is exited for the outlet refrigerant temperature in the outer machine heat exchanger of system not less than set
In the case of the temperature threshold for exiting defrost put or in the defrost time for being used defrost is exited not less than set
In the case of time threshold, the system is controlled to exit defrost, wherein, TN afterwardsTo carry out exiting set during n-th defrost
The temperature threshold of frost, TAfterwards (n-1)To carry out the temperature threshold for exiting defrost set during (n-1)th defrost, T0It is initial setting
Temperature threshold, △ T are set temperature increase, tN afterwardsTo carry out the time for exiting defrost set during n-th defrost
Threshold value, tAfterwards (n-1)To carry out the time threshold for exiting defrost set during (n-1)th defrost, t0It is the time threshold of initial setting
Value, △ t are set time value added.Preferably, the value of the preset times is not less than 2, and the set temperature increases
The scope of value added △ T can be 0.5 DEG C to 5 DEG C；And the scope of the set time value added △ t can be 0.5 point
Clock was to 5 minutes.In the case of currently carrying out the number of times of defrost more than preset times and judging that previous defrost is sordid, then with
Last time defrost is compared, and increase exits the temperature threshold of defrost and increases the time threshold for exiting defrost, and then essentially by
Dynamically extension comes frostization is clean defrost total time.
The concrete operating principle and benefit of the device for defrost provided in an embodiment of the present invention are implemented with the invention described above
The concrete operating principle and benefit of the method for defrost that example is provided are similar, will not be described in great detail here.
Correspondingly, the embodiment of the present invention also provides a kind of air-conditioning, and the air-conditioning can include the above-mentioned device for defrost.
Further, correspondingly, the embodiment of the present invention also provides a kind of heat pump, and the heat pump can be including above-mentioned for changing
The device of frost.
Describe the alternative embodiment of example of the present invention in detail above in association with accompanying drawing, but, the embodiment of the present invention is not limited to
Detail in above-described embodiment, in the range of the technology design of the embodiment of the present invention, can be to the skill of the embodiment of the present invention
Art scheme carries out various simple variants, and these simple variants belong to the protection domain of the embodiment of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the embodiment of the present invention pair
Various possible combinations are no longer separately illustrated.
It will be appreciated by those skilled in the art that all or part of step in realizing above-described embodiment method can be by
Program is completed to instruct the hardware of correlation, and the program storage is in a storage medium, including some instructions are used to so that one
Individual (can be single-chip microcomputer, chip etc.) or processor (processor) perform the whole of each embodiment methods described of the application
Or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
Additionally, can also be combined between a variety of embodiments of the embodiment of the present invention, as long as it is not disobeyed
The thought of the embodiment of the present invention is carried on the back, it should equally be considered as embodiment of the present invention disclosure of that.
Claims (16)
1. a kind of method for defrost, it is characterised in that the method includes：
Judge whether previous defrost is clean；
In the case of previous defrost is sordid, increase exit defrost temperature threshold and/or increase described in exit defrost when
Between threshold value；And
In the case where the outlet refrigerant temperature of the outer machine heat exchanger of system is not less than the temperature threshold for exiting defrost after increasing or
Person controls the system to exit in the case where the defrost time for being used is not less than the time threshold for exiting defrost after increasing
Defrost.
2. method according to claim 1, it is characterised in that methods described also includes：
Judge the current frequency n for carrying out defrost whether more than preset times；
In the case where the current frequency n for carrying out defrost is not more than the preset times, by the exiting of the n-th defrost
The temperature threshold T of frostN afterwardsIt is set to TN afterwards=T0And/or by the time threshold t for exiting defrost of the n-th defrostN afterwardsIt is set to tN afterwards
=t0；
In the case where the current frequency n for carrying out defrost is more than the preset times, performing the previous defrost of judgement is
No clean step,
Wherein, T0It is the temperature threshold of initial setting, t0It is the time threshold of initial setting.
3. method according to claim 2, it is characterised in that methods described also includes：
In the case where previous defrost is clean, by the temperature threshold T for exiting defrost of the n-th defrostN afterwardsIt is set to TN afterwards=
TAfterwards (n-1)And/or by the time threshold t for exiting defrost of the n-th defrostN afterwardsIt is set to tN afterwards=tAfterwards (n-1)；
In the case of previous defrost is sordid, by the temperature threshold T for exiting defrost of the n-th defrostN afterwardsIt is set to TN afterwards=
TAfterwards (n-1)+ △ T and/or the time threshold for exiting defrost of the n-th defrost is set to tN afterwards=tAfterwards (n-1)+△t；
Wherein, TAfterwards (n-1)To carry out the temperature threshold for exiting defrost set during (n-1)th defrost, tAfterwards (n-1)To carry out (n-1)th
The set time threshold for exiting defrost during secondary defrost, △ T are set temperature increase, and △ t are the set time
Value added；
Wherein, the value of the preset times is not less than 2.
4. method according to claim 3, it is characterised in that described to judge whether previous defrost totally includes：
When the system the n-th -2 times is into defrost, the refrigerant inlet temperature of outer machine heat exchanger is entered for (n-1)th time time with the system
In the case that difference when entering defrost between the refrigerant inlet temperature of outer machine heat exchanger is less than predetermined value, judge that previous defrost is done
Only；And
When the system the n-th -2 times is into defrost, the refrigerant inlet temperature of outer machine heat exchanger is entered for (n-1)th time time with the system
Enter difference during defrost between the refrigerant inlet temperature of outer machine heat exchanger not less than in the case of predetermined value, judge previous defrost not
Totally.
5. method according to claim 4, it is characterised in that the scope of the predetermined value is 1 DEG C to 10 DEG C.
6. method according to claim 3, it is characterised in that
The scope of the set temperature increase △ T is 0.5 DEG C to 5 DEG C；And
The scope of the set time value added △ t is 0.5 minute to 5 minutes.
7. the method according to any one claim in claim 2 to 6, it is characterised in that methods described also includes：
When the system is powered every time, start to record the frequency n of defrost again.
8. a kind of device for defrost, it is characterised in that described device includes：
First judge module, for judging whether previous defrost is clean；
Threshold setting module, in the case of previous defrost is sordid, temperature threshold and/or the increase of defrost to be exited in increase
The time threshold for exiting defrost；And
Defrosting control module is exited, for exiting defrost not less than after increasing in the outlet refrigerant temperature of the outer machine heat exchanger of system
Temperature threshold in the case of or the defrost time for being used not less than increase after the time threshold for exiting defrost feelings
Under condition, the system is controlled to exit defrost.
9. device according to claim 8, it is characterised in that described device also includes：
Second judge module, for judging whether the frequency n for currently carrying out defrost is more than preset times；
The threshold setting module is additionally operable to be not more than in the current frequency n for carrying out defrost the situation of the preset times
Under, by the temperature threshold T for exiting defrost of the n-th defrostN afterwardsIt is set to TN afterwards=T0And/or by the exiting of the n-th defrost
The time threshold t of frostN afterwardsIt is set to tN afterwards=t0；
First judge module is additionally operable in the case where the current frequency n for carrying out defrost is more than the preset times,
Judge whether previous defrost is clean,
Wherein, T0It is the temperature threshold of initial setting, t0It is the time threshold of initial setting.
10. device according to claim 9, it is characterised in that the threshold setting module is additionally operable to：
In the case where previous defrost is clean, by the temperature threshold T for exiting defrost of the n-th defrostN afterwardsIt is set to TN afterwards=
TAfterwards (n-1)And/or by the time threshold t for exiting defrost of the n-th defrostN afterwardsIt is set to tN afterwards=tAfterwards (n-1)；
In the case of previous defrost is sordid, by the temperature threshold T for exiting defrost of the n-th defrostN afterwardsIt is set to TN afterwards=
TAfterwards (n-1)+ △ T and/or the time threshold for exiting defrost of the n-th defrost is set to tN afterwards=tAfterwards (n-1)+△t；
Wherein, TAfterwards (n-1)To carry out the temperature threshold for exiting defrost set during (n-1)th defrost, tAfterwards (n-1)To carry out (n-1)th
The set time threshold for exiting defrost during secondary defrost, △ T are set temperature increase, and △ t are the set time
Value added；
Wherein, the value of the preset times is not less than 2.
11. devices according to claim 10, it is characterised in that first judge module is used for：
When the system the n-th -2 times is into defrost, the refrigerant inlet temperature of outer machine heat exchanger is entered for (n-1)th time time with the system
In the case that difference when entering defrost between the refrigerant inlet temperature of outer machine heat exchanger is less than predetermined value, judge that previous defrost is done
Only；And
When the system the n-th -2 times is into defrost, the refrigerant inlet temperature of outer machine heat exchanger is entered for (n-1)th time time with the system
Enter difference during defrost between the refrigerant inlet temperature of outer machine heat exchanger not less than in the case of predetermined value, judge previous defrost not
Totally.
12. devices according to claim 10, it is characterised in that the scope of the predetermined value is 1 DEG C to 10 DEG C.
13. devices according to claim 10, it is characterised in that
The scope of the set temperature increase △ T is 0.5 DEG C to 5 DEG C；And
The scope of the set time value added △ t is 0.5 minute to 5 minutes.
14. device according to any one claim in claim 9 to 13, it is characterised in that described device is also wrapped
Include：
Defrost number of times logging modle, the frequency n for when the system is powered every time, starting record defrost again.
15. a kind of air-conditionings, it is characterised in that the air-conditioning is included according to any one claim institute in claim 8 to 14
The device for defrost stated.
16. a kind of heat pumps, it is characterised in that the heat pump is included according to any one claim institute in claim 8 to 14
The device for defrost stated.
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| CN112032929A (en) * | 2020-08-31 | 2020-12-04 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device |
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