CN105928209B - Heat pump water-heating machine and its defrosting control method and device - Google Patents
Heat pump water-heating machine and its defrosting control method and device Download PDFInfo
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- CN105928209B CN105928209B CN201610264891.0A CN201610264891A CN105928209B CN 105928209 B CN105928209 B CN 105928209B CN 201610264891 A CN201610264891 A CN 201610264891A CN 105928209 B CN105928209 B CN 105928209B
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- defrost
- heat pump
- pump water
- heating machine
- coil temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a kind of heat pump water-heating machine and its defrosting control methods and device, it the described method comprises the following steps: when heat pump water-heating machine enters defrost pattern, the operating current of compressor in system pressure or heat pump water-heating machine when obtaining n times defrost before heat pump water-heating machine, and defrost coil temperature is exited when obtaining last defrost；The variation tendency of system pressure before judging when n times defrost, or judge the variation tendency of the operating current of compressor when preceding n times defrost；The defrost coil temperature that exits when according to the variation tendency of system pressure or the variation tendency of the operating current of compressor to the defrost of heat pump water-heating machine last time is modified and exits defrost coil temperature with obtain the current defrost period, and carries out defrosting control to heat pump water-heating machine according to the defrost coil temperature that exits in current defrost period.To achieve the purpose that defrost is completely easy to appear the stable operation that high pressure is excessively high, under raising water heating quality and guarantee hot water model with solution defrost in the process.
Description
Technical field
The present invention relates to hot water machine technical field, in particular to a kind of heat pump water-heating machine and its defrosting control method and dress
It sets.
Background technique
Heat pump water-heating machine will appear frost in hot water model, especially in Central China and North China region, in winter
Temperature it is low and encounter it is rainy, snow, under the adverse circumstances such as dense fog or continuous cloudy day, heat pump water-heating machine is more easier frosting occur existing
As.Moreover, since the heat exchanger frosting that air humidity will lead to greatly unit is serious, and then leading to defrost not during defrost
Thoroughly, water heating effect is influenced；Defrost separately is executed in the case where the heat exchanger frosting of unit is serious and maintains high leaving water temperature,
If defrost overlong time and leaving water temperature is excessively high, the high-pressure moment of system rises quickly, eventually leads to system appearance
High voltage protective phenomenon.
In the related technology, it is unclean excessively high with high-pressure that defrost is solved by by-pass collar or increase relief valve
Problem, but these methods are built upon on the direct material cost for increasing heat pump water-heating machine.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of defrosting control method of heat pump water-heating machine, this method by the variation tendency of system pressure or
The defrost coil temperature that the exits when variation tendency of compressor operating electric current is to defrost is modified, and is exited according to revised
Defrost coil temperature carries out defrosting control to heat pump water-heating machine, to reach defrost completely and solve to be easy to appear during defrost
The excessively high purpose of high pressure.
It is another object of the present invention to the defrosting control devices for proposing a kind of heat pump water-heating machine.
Yet another object of the invention is that proposing a kind of heat pump water-heating machine.
To achieve the above object, one aspect of the present invention embodiment proposes a kind of defrosting control method of heat pump water-heating machine,
The following steps are included: when the heat pump water-heating machine enters defrost pattern, when obtaining n times defrost before the heat pump water-heating machine is
When uniting the operating current of compressor in pressure or the heat pump water-heating machine, and obtaining the heat pump water-heating machine last time defrost
Exit defrost coil temperature, wherein N is the integer more than or equal to 3；Judge the variation of system pressure when the preceding n times defrost
Trend, or judge the variation tendency of the operating current of compressor when the preceding n times defrost；And according to the system pressure
It is exited when the variation tendency of the operating current of variation tendency or the compressor is to the heat pump water-heating machine last time defrost
Defrost coil temperature, which is modified, exits defrost coil temperature with obtain the heat pump water-heating machine current defrost period, and according to
The defrost coil temperature that exits in the current defrost period carries out defrosting control to the heat pump water-heating machine.
The defrosting control method of the heat pump water-heating machine of the embodiment of the present invention is obtained when heat pump water-heating machine enters defrost pattern
The operating current of compressor in system pressure or heat pump water-heating machine when taking n times defrost before heat pump water-heating machine, and obtain heat pump
Defrost coil temperature is exited when the defrost of hot water machine last time, then, the variation of the system pressure before judging when n times defrost becomes
Gesture perhaps judges the variation tendency of the operating current of compressor when preceding n times defrost according to the variation tendency or pressure of system pressure
The defrost coil temperature that the exits when variation tendency of the operating current of contracting machine is to the defrost of heat pump water-heating machine last time is modified, with
Obtain the current defrost period exits defrost coil temperature, finally, exiting defrost coil temperature pair according to the current defrost period
Heat pump water-heating machine carries out defrosting control, to reach defrost completely and solve to be easy to appear the excessively high mesh of high pressure during defrost
, it improves the quality of unit water heating and guarantees stable operation of the unit under hot water model.
According to one embodiment of present invention, according to the work of the variation tendency of the system pressure or the compressor
The defrost coil temperature that the exits when variation tendency of electric current is to the heat pump water-heating machine last time defrost is modified to obtain
That states the heat pump water-heating machine current defrost period exits defrost coil temperature, comprising: if the system pressure is in rising trend, or
The operating current of compressor described in person is in rising trend, then the defrost coil temperature that exits in the current defrost period is on described
The defrost coil temperature that exits when defrost is superimposed preset temperature compensation value；If the system pressure is on a declining curve,
Or the operating current of the compressor is in lower liter of trend, then the defrost coil temperature that exits in the current defrost period is described
The defrost coil temperature that exits when last defrost subtracts the preset temperature compensation value；If the system pressure be in neither
The operating current of ascendant trend nor downward trend or the compressor is in the then institute neither ascendant trend nor downward trend
It states exiting for current defrost period and exits defrost coil temperature when defrost coil temperature is the last defrost.
According to one embodiment of present invention, defrost coil temperature is exited to the heat according to the current defrost period
Pump hot water machine carries out defrosting control, comprising: obtains the current coil temperature of the heat pump water-heating machine；Judge the current coil pipe temperature
Whether degree, which is more than or equal to the current period, is exited defrost coil temperature, and judges that defrost time of the heat pump water-heating machine is
It is no to reach preset defrost required time；If the current coil temperature exits defrost disk more than or equal to the current period
The time required to tube temperature degree and the defrost time reach the preset defrost, then controls the heat pump water-heating machine and exit defrost mould
Formula.
According to one embodiment of present invention, during the heat pump water-heating machine defrost, in the heat pump water-heating machine
Compressor is in operating status, and the outdoor fan in the heat pump water-heating machine is out of service.
To achieve the above object, another aspect of the present invention embodiment proposes a kind of defrosting control dress of heat pump water-heating machine
It sets, comprising: first obtains module, for obtaining N before the heat pump water-heating machine when the heat pump water-heating machine enters defrost pattern
The operating current of system pressure or the compressor when secondary defrost, wherein N is the integer more than or equal to 3；Second obtains mould
Block, for obtaining the exiting when the heat pump water-heating machine last time defrost when the heat pump water-heating machine enters defrost pattern
White coil temperature；Judgment module, the judgment module are connected with the first acquisition module, and the judgment module is for judging institute
The variation tendency of system pressure before stating when n times defrost, or judge the change of the operating current of compressor when the preceding n times defrost
Change trend；And control module, the control module is connected with the second acquisition module and the judgment module respectively, described
Control module is used for the variation tendency of the operating current of the variation tendency or compressor according to the system pressure to institute
The defrost coil temperature that exits when stating the defrost of heat pump water-heating machine last time is modified to obtain the heat pump water-heating machine and currently change
The white period exits defrost coil temperature, and exits defrost coil temperature to the Heat Pump according to the current defrost period
Water dispenser carries out defrosting control.
The defrosting control device of the heat pump water-heating machine of the embodiment of the present invention leads to when heat pump water-heating machine enters defrost pattern
Cross first acquisition module obtain heat pump water-heating machine before n times defrost when system pressure or heat pump water-heating machine in compressor work
Electric current, and obtained by second and exit defrost coil temperature when module obtains the defrost of heat pump water-heating machine last time, then, control
The variation tendency of system pressure before module judges when n times defrost, or judge the operating current of compressor when preceding n times defrost
Variation tendency, and according to the variation tendency of the operating current of the variation tendency or compressor of system pressure on heat pump water-heating machine
The defrost coil temperature that exits when defrost is modified, and exits defrost coil temperature with obtain the current defrost period, most
Afterwards, control module carries out defrosting control to heat pump water-heating machine according to the defrost coil temperature that exits in current defrost period, to reach
It completely and during solution defrost is easy to appear the excessively high purpose of high pressure to defrost, the quality of unit water heating is improved and guarantees machine
Stable operation of the group under hot water model.
According to one embodiment of present invention, the control module according to the system pressure variation tendency or institute
When stating the variation tendency of the operating current of compressor to the heat pump water-heating machine last time defrost exit defrost coil temperature into
Row amendment is to obtain when exiting defrost coil temperature of the heat pump water-heating machine current defrost period, wherein if the system
Pressure is in rising trend or the operating current of the compressor is in rising trend, then the exiting in the current defrost period
The defrost coil temperature that exits when white coil temperature is the last defrost is superimposed preset temperature compensation value；If the system
Pressure of uniting is on a declining curve or the operating current of the compressor is in lower liter of trend, then the current defrost period exits
The defrost coil temperature that exits when defrost coil temperature is the last defrost subtracts the preset temperature compensation value；If
The system pressure is in neither the operating current of ascendant trend nor downward trend or the compressor is in neither ascendant trend
Nor downward trend, then exiting for the current defrost period exits defrost when defrost coil temperature is the last defrost
Coil temperature.
According to one embodiment of present invention, the defrosting control device of above-mentioned heat pump water-heating machine, further includes: third obtains
Module, the third obtain module and are connected with the control module, and the third obtains module for obtaining the heat-pump hot-water
The current coil temperature of machine, wherein the control module judges whether the current coil temperature is more than or equal to the current week
Phase exits defrost coil temperature, and judges whether the defrost time of the heat pump water-heating machine reaches preset defrost and taken
Between, if the current coil temperature be more than or equal to the current period exit defrost coil temperature and the defrost time reaches
When to the time required to the preset defrost, the control module then controls the heat pump water-heating machine and exits defrost pattern.
According to one embodiment of present invention, during the heat pump water-heating machine defrost, in the heat pump water-heating machine
Compressor is in operating status, and the outdoor fan in the heat pump water-heating machine is out of service.
In addition, the embodiment of the present invention also proposed a kind of heat pump water-heating machine comprising the change of above-mentioned heat pump water-heating machine
White control device.
The heat pump water-heating machine of the embodiment of the present invention can be reached defrost and completely be conciliate by above-mentioned defrosting control device
It certainly is easy to appear the excessively high purpose of high pressure during defrost, improve the quality of water heating and guarantees the stabilization under hot water model
Operation improves user experience.
Detailed description of the invention
Fig. 1 is the flow chart of the defrosting control method of heat pump water-heating machine according to an embodiment of the present invention.
Fig. 2 is the block diagram of the defrosting control device of heat pump water-heating machine according to an embodiment of the present invention.
Fig. 3 is the block diagram of the defrosting control device of heat pump water-heating machine according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings come describe the heat pump water-heating machine proposed according to embodiments of the present invention and its defrosting control method and
Device.
Fig. 1 is the flow chart of the defrosting control method of heat pump water-heating machine according to an embodiment of the present invention.As shown in Figure 1, should
The defrosting control method of heat pump water-heating machine the following steps are included:
S1, when heat pump water-heating machine enters defrost pattern, obtain heat pump water-heating machine before n times defrost when system pressure or
The operating current of compressor in heat pump water-heating machine, and defrost coil temperature is exited when obtaining the defrost of heat pump water-heating machine last time,
Wherein, N is the integer more than or equal to 3.
According to one embodiment of present invention, during heat pump water-heating machine defrost, at the compressor in heat pump water-heating machine
Outdoor fan in operating status, heat pump water-heating machine is out of service.
S2, the variation tendency of the system pressure before judging when n times defrost, or judge the work of compressor when preceding n times defrost
Make the variation tendency of electric current.
Specifically, in heat pump water-heating machine in hot water model operational process, if judged according to associated control logic
Meet defrost condition, then control heat pump water-heating machine and enter defrost pattern: compressor operation, four-way valve commutation, outdoor fan stop
Operation.During defrost, the coil temperature of set heat exchange device is constantly increased, when coil temperature, which reaches, exits defrost condition,
Control heat pump water-heating machine exits defrost pattern: compressor operation, four-way valve commutation, outdoor fan bring into operation.
Since the defrost condition that exits of heat pump water-heating machine is limited by coil temperature, and coil temperature is according to each defrost
When system pressure variation tendency or compressor operating current variation tendency, therefore, in an embodiment of the present invention,
Each exiting can be controlled by the variation tendency of the operating current of the variation tendency or compressor of the system pressure of acquisition
Coil temperature and defrost time when white mode.
S3, according to the variation tendency of system pressure or the variation tendency of the operating current of compressor on heat pump water-heating machine
The defrost coil temperature that exits when defrost is modified and exits defrost disk with obtain the heat pump water-heating machine current defrost period
Tube temperature degree, and defrosting control is carried out to heat pump water-heating machine according to the defrost coil temperature that exits in current defrost period.
According to one embodiment of present invention, according to the change of the variation tendency of system pressure or the operating current of compressor
When change trend is to the defrost of heat pump water-heating machine last time exit defrost coil temperature be modified it is current to obtain heat pump water-heating machine
The defrost period exits defrost coil temperature, comprising: if system pressure is in rising trend or the operating current of compressor is in
Ascendant trend, then exiting for current defrost period exits the superposition of defrost coil temperature when defrost coil temperature is last defrost
Preset temperature compensation value；If system pressure is on a declining curve or the operating current of compressor is in lower liter of trend, currently
The defrost coil temperature that exits exited when defrost coil temperature is last defrost in defrost period subtracts preset temperature-compensating
Value；If system pressure is in neither the operating current of ascendant trend nor downward trend or compressor is in neither ascendant trend
Nor downward trend, then exiting for current defrost period exits defrost coil pipe temperature when defrost coil temperature is last defrost
Degree.
According to one embodiment of present invention, defrost coil temperature is exited to heat pump water-heating machine according to the current defrost period
Carry out defrosting control, comprising: obtain the current coil temperature of heat pump water-heating machine；Judge whether current coil temperature is more than or equal to work as
The preceding period exits defrost coil temperature, and judges whether the defrost time of heat pump water-heating machine reaches preset defrost and taken
Between；If current coil temperature be more than or equal to current period exit defrost coil temperature and the defrost time reaches preset defrost
Required time then controls heat pump water-heating machine and exits defrost pattern.
System pressure when former defrost three times is that the present invention will be described in detail for radix starting point below.
Specifically, during defrost three times before each heat pump water-heating machine runs hot water model, if coil pipe temperature
Spend TCoil pipe>=exit the time required to defrost coil temperature Ts and defrost time are more than defrost such as N seconds, then terminate defrost.It records simultaneously
System pressure P1, P2, P3 when preceding defrost three times, and judge that the variation of system pressure P1, P2, P3 when preceding defrost three times become
Gesture.
If system pressure P 1, P2, P3 when preceding defrost three times are in neither ascendant trend nor downward trend, the
During four defrosts, as coil temperature TCoil pipeWhen >=Ts and defrost time are more than defrost required time N seconds, terminate defrost.5th
Secondary defrost then according to before it three times defrost when system pressure variation tendency, it is subsequent and so on.
If system pressure P1, P2, P3 when preceding defrost three times are in rising trend, i.e. P1 < P2 < P3 < Pmax (Pmax
For system maximum pressure protection value), then next exit coil temperature T when defrostCoil pipeIt is adjusted according to following formula:
During 1st defrost, work as TCoil pipe 1>=Ts- Δ T and defrost time are more than N seconds, terminate defrost；
During 2nd defrost, work as TCoil pipe 2>=T1- Δ T and defrost time are more than N seconds, terminate defrost, wherein T1 is the 1st
Defrost coil temperature, i.e. T1=Ts- Δ T are exited when secondary defrost；
... and so on；
During n-th defrost, work as TCoil pipe N≥TN-1Δ T and defrost time are more than N seconds, terminate defrost.
If system pressure P1, P2, P3 when preceding defrost three times are on a declining curve, i.e. P1 > P2 > P3 > Pmix (Pmix
System minimum pressure protection value), then next exit coil temperature T when defrostCoil pipeIt is adjusted according to following formula:
During 1st defrost, work as TCoil pipe 1>=Ts+ Δ T and defrost time are more than N seconds, terminate defrost；
During 2nd defrost, work as TCoil pipe 2>=T1+ Δ T and defrost time are more than N seconds, terminate defrost, wherein T1 the
Defrost coil temperature, i.e. T1=Ts+ Δ T are exited when defrost；
... and so on；
During n-th defrost, work as TCoil pipe N≥TN-1+ Δ T and defrost time are more than N seconds, terminate defrost.
It should be noted that above system pressure, which can be heat pump water-heating machine, exits the system high pressure that defrost moment detects
Pressure value (pressure value at such as exhaust outlet of compressor).Temperature difference compensation value Δ T can be set according to actual conditions, when using area,
When using field difference, Δ T value also can be different, such as Δ T can be with value for 0.5,1,1.5 or 2 etc..It can the time required to defrost
To preset, can also be adjusted in real time according to defrost coil temperature is exited.
Further, a specific example according to the present invention, in the heat pump water-heating machine course of work, record it is adjacent first three
System pressure when secondary defrost is respectively P1, P2, P3, and the defrost coil temperature that exits when heat pump water-heating machine third time defrost is
Ts.When heat pump water-heating machine will execute the 4th defrost, to before record three times defrost when system pressure P1, P2, P3 into
Row judgement.
If system pressure P1, P2, P3 when preceding defrost three times are in rising trend, i.e. P1 < P2 < P3 < Pmax, then
Defrost coil temperature T is exited when four defrostsCoil pipe 4=Ts- △ T.That is, during the 4th defrost, if real-time detection
Coil temperature, which reaches, exits defrost coil temperature TCoil pipe 4, then the 4th defrost is exited, and start to run with hot water model.
After heat pump water-heating machine heats a period of time, if meeting defrost condition, start to execute the 5th defrost.Will
When executing the 5th defrost, system pressure when preceding defrost three times is obtained, and judge it.If examined when the 4th defrost
The system pressure of survey is P4, and P3 < P4 < Pmax, the system pressure then for the 5th defrost, when preceding defrost three times
Power P2, P3, P4 are still in rising trend, i.e. P2 < P3 < P4 < Pmax, then exit defrost coil temperature when the 5th defrost
TCoil pipe 5=TCoil pipe 4-△T。
Then, if the system pressure that detects of when the 5th defrost is P5, and P4 > P5 > Pmix, then relative to the 6th
For secondary defrost, system pressure P3, P4, P5 when preceding defrost three times are in then the 6th time neither ascendant trend nor downward trend
Defrost coil temperature T is exited when defrostCoil pipe 6=TCoil pipe 5。
Then, if the system pressure that detects of when the 6th defrost is P6, and P5 > P6 > Pmix, then relative to the 7th
For secondary defrost, system pressure P4, P5, P6 when preceding defrost three times are on a declining curve, i.e. P4 > P5 > P6 > Pmix, then and the 7th
Defrost coil temperature T is exited when secondary defrostCoil pipe 7=TCoil pipe 6+ △ T, subsequent and so on, until heat pump water-heating machine receives shutdown
Signal, heat pump water-heating machine are out of service.After heat pump water-heating machine works on power, continue according to above-mentioned logic to heat pump water-heating machine into
Row defrosting control.
It should be noted that carrying out defrosting control to heat pump water-heating machine according to the operating current of compressor and according to system pressure
The logic that the variation tendency of power carries out defrosting control to heat pump water-heating machine is identical, and which is not described herein again.
In conclusion the defrosting control method of the heat pump water-heating machine of the embodiment of the present invention, no matter stop among heat pump water-heating machine
Be switched on after machine or failure after be switched on, when heat pump water-heating machine enters defrost pattern every time, before first obtaining during n times defrosts
System pressure perhaps the operating current of compressor and before judging during n times defrosts system pressure variation tendency or pressure
Then the variation tendency of contracting machine operating current accumulates superposition core further according to variation tendency and the control logic of preset design automatically
It calculates, increases or decreases the optimum value of coil temperature when temperature difference compensation value exits defrost to determine, realize accurate intelligent defrosting, most
Achieve the effect that defrost eventually completely and reduce system high pressure hypertonia during defrost, improves the water heating of heat pump water-heating machine
Quality ensure that user's uses coolant-temperature gage and water consumption, while provide reliable guarantee for the stable operation of heat pump water-heating machine, improve
The quality and satisfaction of heat pump water-heating machine.
Fig. 2 is the block diagram of the defrosting control device of heat pump water-heating machine according to an embodiment of the present invention.As shown in Fig. 2, the heat
The defrosting control device of pump hot water machine includes: that the first acquisition module 10, second obtains module 20, judgment module 30 and control module
40。
Wherein, first module 10 is obtained for obtaining n times before heat pump water-heating machine when heat pump water-heating machine enters defrost pattern
The operating current of system pressure or compressor when defrost, wherein N is the integer more than or equal to 3.Second, which obtains module 20, uses
In when heat pump water-heating machine enters defrost pattern, defrost coil temperature is exited when obtaining the defrost of heat pump water-heating machine last time.Sentence
Disconnected module 30 is connected with the first acquisition module 10, and the variation of the system pressure before judgment module 30 is used to judge when n times defrost becomes
Gesture, or judge the variation tendency of the operating current of compressor when preceding n times defrost.Control module 40 obtains module with second respectively
20 are connected with judgment module 30, and control module 40 is used for the operating current of the variation tendency or compressor according to system pressure
The defrost coil temperature that exits when variation tendency is to the defrost of heat pump water-heating machine last time is modified to obtain heat pump water-heating machine and work as
The preceding defrost period exits defrost coil temperature, and exits defrost coil temperature to heat pump water-heating machine according to the current defrost period
Carry out defrosting control.
According to one embodiment of present invention, during heat pump water-heating machine defrost, at the compressor in heat pump water-heating machine
Outdoor fan in operating status, heat pump water-heating machine is out of service.
Specifically, in heat pump water-heating machine in hot water model operational process, if judged according to associated control logic
Meet defrost condition, control module 40 then controls heat pump water-heating machine and enters defrost pattern: compressor operation, four-way valve commutation, room
Outer blower is out of service.During defrost, the coil temperature of set heat exchange device is constantly increased, when coil temperature reaches exiting
When ice-lolly part, control module 40 controls heat pump water-heating machine and exits defrost pattern: compressor operation, four-way valve commutation, outdoor fan
It brings into operation.
Since the defrost condition that exits of heat pump water-heating machine is limited by coil temperature, and coil temperature is according to each defrost
When system pressure variation tendency or compressor operating current variation tendency, therefore, in an embodiment of the present invention,
Each exiting can be controlled by the variation tendency of the operating current of the variation tendency or compressor of the system pressure of acquisition
Coil temperature and defrost time when white mode.Then, according to the variation tendency of system pressure or the operating current of compressor
Variation tendency to the defrost of heat pump water-heating machine last time when the defrost coil temperature that exits be modified, to obtain heat pump water-heating machine
The current defrost period exits defrost coil temperature, and exits defrost coil temperature to heat-pump hot-water according to the current defrost period
Machine carries out defrosting control.
According to one embodiment of present invention, control module 40 is according to the variation tendency of system pressure or compressor
The defrost coil temperature that the exits when variation tendency of operating current is to the defrost of heat pump water-heating machine last time is modified to obtain heat
When exiting defrost coil temperature of pump hot water machine current defrost period, wherein if system pressure is in rising trend, or compression
The operating current of machine is in rising trend, then the exiting exited when defrost coil temperature is last defrost in current defrost period
White coil temperature is superimposed preset temperature compensation value；If system pressure is on a declining curve or the operating current of compressor is in
Lower liter of trend, then the defrost coil temperature that exits exited when defrost coil temperature is last defrost in current defrost period subtracts
Preset temperature compensation value；If system pressure is in neither the operating current of ascendant trend nor downward trend or compressor
In neither ascendant trend nor downward trend, then the current defrost period exits moving back when defrost coil temperature is last defrost
Defrost coil temperature out.
According to one embodiment of present invention, as shown in figure 3, the defrosting control device of above-mentioned heat pump water-heating machine also wraps
Include: third obtains module 50, and third obtains module 50 and is connected with control module 40, and third obtains module 50 for obtaining Heat Pump
The current coil temperature of water dispenser, wherein control module 40 judges whether current coil temperature is more than or equal to exiting for current period
Defrost coil temperature, and judge whether the defrost time of heat pump water-heating machine reaches preset defrost required time, if working as shroud
Tube temperature degree be more than or equal to current period exit defrost coil temperature and when the defrost time reaches the time required to preset defrost, control
Molding block 40 then controls heat pump water-heating machine and exits defrost pattern.
System pressure when former defrost three times is that the present invention will be described in detail for radix starting point below.
Specifically, during defrost three times before each heat pump water-heating machine runs hot water model, if coil pipe temperature
Spend TCoil pipe>=exit the time required to defrost coil temperature Ts and defrost time are more than defrost such as N seconds, then terminate defrost.It records simultaneously
System pressure P1, P2, P3 when preceding defrost three times, and judge that the variation of system pressure P1, P2, P3 when preceding defrost three times become
Gesture.
If it is determined that module 30 judge before three times defrost when system pressure P 1, P2, P3 be in neither ascendant trend nor under
Drop trend, then during the 4th defrost, during the 4th defrost, as coil temperature TCoil pipe>=Ts and defrost time
When more than N seconds the time required to defrost, terminate defrost.5th defrost then according to before it three times defrost when system pressure variation
Trend, subsequent and so on.
If system pressure P1, P2, P3 when preceding defrost three times are in rising trend, i.e. P1 < P2 < P3 < Pmax then connects
Get off to exit coil temperature T when defrostCoil pipeIt is adjusted according to following formula:
During 1st defrost, work as TCoil pipe 1>=Ts- Δ T and defrost time are more than N seconds, terminate defrost；
During 2nd defrost, work as TCoil pipe 2>=T1- Δ T and defrost time are more than N seconds, terminate defrost, wherein T1 is the 1st
Defrost coil temperature, i.e. T1=Ts- Δ T are exited when secondary defrost；
... and so on；
During n-th defrost, work as TCoil pipe N≥TN-1Δ T and defrost time are more than N seconds, terminate defrost.
If system pressure P1, P2, P3 when preceding defrost three times are on a declining curve, i.e. P1 > P2 > P3 > Pmix then connects
Get off to exit coil temperature T when defrostCoil pipeIt is adjusted according to following formula:
During 1st defrost, work as TCoil pipe 1>=Ts+ Δ T and defrost time are more than N seconds, terminate defrost；
During 2nd defrost, work as TCoil pipe 2>=T1+ Δ T and defrost time are more than N seconds, terminate defrost, wherein T1 the
Defrost coil temperature, i.e. T1=Ts+ Δ T are exited when defrost；
... and so on；
During n-th defrost, work as TCoil pipe N≥TN-1+ Δ T and defrost time are more than N seconds, terminate defrost.
It is exited defrost moment it should be noted that system pressure can be heat pump water-heating machine, the system high pressure pressure of detection
It is worth (pressure value at such as exhaust outlet of compressor).Temperature difference compensation value Δ T can be set according to actual conditions, and when using area, use
When field is different, Δ T value also can be different, such as Δ T can be with value for 0.5,1,1.5 or 2 etc..It can be pre- the time required to defrost
It first sets, can also be adjusted in real time according to defrost coil temperature is exited.
Further, a specific example according to the present invention, in the heat pump water-heating machine course of work, first obtains module
10 obtain it is adjacent before three times defrost when system pressure be respectively P1, P2, P3, and second obtains module 20 and obtains heat pump water-heating machine
The defrost coil temperature that exits when third time defrost is Ts.When heat pump water-heating machine will execute the 4th defrost, judgment module
System pressure P1, P2, P3 when the preceding defrost three times of 30 pairs of acquisitions judge.
If system pressure P1, P2, P3 when preceding defrost three times are in rising trend, i.e. P1 < P2 < P3 < Pmax is then controlled
Defrost coil temperature T is exited when molding block 40 calculates the 4th defrostCoil pipe 4=Ts- △ T.That is, during the 4th defrost,
If the coil temperature that third obtains 50 real-time detection of module, which reaches, exits defrost coil temperature TCoil pipe 4, then control module 40 controls
Heat pump water-heating machine exits the 4th defrost, and controls heat pump water-heating machine and start to run with hot water model.
After heat pump water-heating machine heats a period of time, if meeting defrost condition, start to execute the 5th defrost.Will
When executing the 5th defrost, first acquisition module 10 obtain before three times defrost when system pressure, 30 pairs of judgment module acquisition
System pressure is judged.If the system pressure detected when the 4th defrost is P4, and P3 < P4 < Pmax, then relative to
For 5th defrost, system pressure P2, P3, P4 when preceding defrost three times are still in rising trend, i.e. P2 < P3 < P4 < Pmax,
Defrost coil temperature T is exited when then control module 40 calculates the 5th defrostCoil pipe 5=TCoil pipe 4-△T。
Then, if the system pressure that detects of when the 5th defrost is P5, and P4 > P5 > Pmix, then relative to the 6th
For secondary defrost, system pressure P3, P4, P5 when preceding defrost three times are in neither ascendant trend nor downward trend, then control mould
Defrost coil temperature T is exited when block 40 calculates the 6th defrostCoil pipe 6=TCoil pipe 5。
Then, if the system pressure that detects of when the 6th defrost is P6, and P5 > P6 > Pmix, then relative to the 7th
For secondary defrost, system pressure P4, P5, P6 when preceding defrost three times are on a declining curve, i.e. P4 > P5 > P6 > Pmix is then controlled
Defrost coil temperature T is exited when module 40 calculates the 7th defrostCoil pipe 7=TCoil pipe 6+ △ T, subsequent and so on, until Heat Pump
Water dispenser receives off signal, and heat pump water-heating machine is out of service.After heat pump water-heating machine works on power, continue according to above-mentioned logic
Defrosting control is carried out to heat pump water-heating machine.
It should be noted that carrying out defrosting control to heat pump water-heating machine according to the operating current of compressor and according to system pressure
The logic that the variation tendency of power carries out defrosting control to heat pump water-heating machine is identical, and which is not described herein again.
In conclusion the defrosting control device of the heat pump water-heating machine of the embodiment of the present invention, no matter stop among heat pump water-heating machine
Be switched on after machine or failure after be switched on, when heat pump water-heating machine enters defrost pattern every time, before first obtaining during n times defrosts
System pressure perhaps the operating current of compressor and before judging during n times defrosts system pressure variation tendency or pressure
Then the variation tendency of contracting machine operating current accumulates superposition core further according to variation tendency and the control logic of preset design automatically
It calculates, increases or decreases the optimum value of coil temperature when temperature difference compensation value exits defrost to determine, realize accurate intelligent defrosting, most
Achieve the effect that defrost eventually completely and reduce system high pressure hypertonia during defrost, improves the water heating of heat pump water-heating machine
Quality ensure that user's uses coolant-temperature gage and water consumption, while provide reliable guarantee for the stable operation of heat pump water-heating machine, improve
The quality and satisfaction of heat pump water-heating machine.
In addition, the embodiment of the present invention also proposed a kind of heat pump water-heating machine comprising the change of above-mentioned heat pump water-heating machine
White control device.
The heat pump water-heating machine of the embodiment of the present invention can be reached defrost and completely be conciliate by above-mentioned defrosting control device
It certainly is easy to appear the excessively high purpose of high pressure during defrost, improve the quality of water heating and guarantees the stabilization under hot water model
Operation improves user experience.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (9)
1. a kind of defrosting control method of heat pump water-heating machine, which comprises the following steps:
When the heat pump water-heating machine enters defrost pattern, obtain system pressure when n times defrost before the heat pump water-heating machine or
The operating current of compressor in heat pump water-heating machine described in person, and defrost is exited when obtaining the heat pump water-heating machine last time defrost
Coil temperature, wherein N is the integer more than or equal to 3；
Judge the variation tendency of system pressure when the preceding n times defrost, or judges the work of compressor when the preceding n times defrost
Make the variation tendency of electric current；And
According to the variation tendency of the system pressure or the variation tendency of the operating current of the compressor to the Heat Pump
The defrost coil temperature that the exits when defrost of water dispenser last time is modified to obtain the heat pump water-heating machine current defrost period
Defrost coil temperature is exited, and the heat pump water-heating machine is carried out according to the defrost coil temperature that exits in the current defrost period
Defrosting control.
2. the defrosting control method of heat pump water-heating machine according to claim 1, which is characterized in that according to the system pressure
Variation tendency or the compressor operating current variation tendency to the heat pump water-heating machine last time defrost when move back
Defrost coil temperature, which is modified, out exits defrost coil temperature with obtain the heat pump water-heating machine current defrost period, packet
It includes:
If the system pressure is in rising trend or the operating current of the compressor is in rising trend, described current
The defrost coil temperature that exits exited when defrost coil temperature is the last defrost in defrost period is superimposed preset temperature
Offset；
If the system pressure is on a declining curve or the operating current of the compressor is on a declining curve, described current
The defrost period exit when defrost coil temperature is the last defrost exit defrost coil temperature subtract it is described preset
Temperature compensation value；
If the system pressure be in neither the operating current of ascendant trend nor downward trend or the compressor be in neither
Ascendant trend nor downward trend, then the current defrost period exits when defrost coil temperature is the last defrost
Exit defrost coil temperature.
3. the defrosting control method of heat pump water-heating machine according to claim 1 or 2, which is characterized in that according to described current
The defrost coil temperature that exits in defrost period carries out defrosting control to the heat pump water-heating machine, comprising:
Obtain the current coil temperature of the heat pump water-heating machine；
Judge that whether the current coil temperature be more than or equal to the current defrost period exits defrost coil temperature, and judges
The time required to whether the defrost time of the heat pump water-heating machine reaches preset defrost；
If the current coil temperature exits defrost coil temperature and the defrost more than or equal to the current defrost period
The time required to time reaches the preset defrost, then controls the heat pump water-heating machine and exit defrost pattern.
4. the defrosting control method of heat pump water-heating machine according to claim 1, which is characterized in that in the heat pump water-heating machine
During defrost, the compressor in the heat pump water-heating machine is in operating status, and the outdoor fan in the heat pump water-heating machine stops
Only run.
5. a kind of defrosting control device of heat pump water-heating machine characterized by comprising
First obtains module, for obtaining n times before the heat pump water-heating machine when the heat pump water-heating machine enters defrost pattern
The operating current of compressor in system pressure or heat pump water-heating machine when white, wherein N is the integer more than or equal to 3；
Second obtains module, last for when the heat pump water-heating machine enters defrost pattern, obtaining the heat pump water-heating machine
Defrost coil temperature is exited when defrost；
Judgment module, the judgment module are connected with the first acquisition module, and the judgment module is for judging the preceding n times
The variation tendency of system pressure when defrost, or judge the variation tendency of the operating current of compressor when the preceding n times defrost；
And
Control module, the control module are connected with the second acquisition module and the judgment module respectively, the control mould
Block is used for the variation tendency of the operating current of the variation tendency or compressor according to the system pressure to the heat pump
The defrost coil temperature that the exits when defrost of hot water machine last time is modified to obtain the heat pump water-heating machine current defrost period
Exit defrost coil temperature, and according to the current defrost period exit defrost coil temperature to the heat pump water-heating machine into
Row defrosting control.
6. the defrosting control device of heat pump water-heating machine according to claim 5, which is characterized in that the control module is in root
According to the variation tendency or compressor of the system pressure operating current variation tendency on the heat pump water-heating machine
The defrost coil temperature that exits when defrost is modified to obtain the exiting in the heat pump water-heating machine current defrost period
When white coil temperature, wherein
If the system pressure is in rising trend or the operating current of the compressor is in rising trend, described current
The defrost coil temperature that exits exited when defrost coil temperature is the last defrost in defrost period is superimposed preset temperature
Offset；
If the system pressure is on a declining curve or the operating current of the compressor is on a declining curve, described current
The defrost period exit when defrost coil temperature is the last defrost exit defrost coil temperature subtract it is described preset
Temperature compensation value；
If the system pressure be in neither the operating current of ascendant trend nor downward trend or the compressor be in neither
Ascendant trend nor downward trend, then the current defrost period exits when defrost coil temperature is the last defrost
Exit defrost coil temperature.
7. the defrosting control device of heat pump water-heating machine according to claim 5 or 6, which is characterized in that further include:
Third obtains module, and the third obtains module and is connected with the control module, and the third obtains module for obtaining
The current coil temperature of the heat pump water-heating machine, wherein
The control module judges that whether the current coil temperature be more than or equal to the current defrost period exits defrost disk
Tube temperature degree, and judge whether the defrost time of the heat pump water-heating machine reaches preset defrost required time, if described current
Coil temperature be more than or equal to the current defrost period exit defrost coil temperature and the defrost time reaches described default
Defrost the time required to when, the control module then controls the heat pump water-heating machine and exits defrost pattern.
8. the defrosting control device of heat pump water-heating machine according to claim 7, which is characterized in that in the heat pump water-heating machine
During defrost, the compressor in the heat pump water-heating machine is in operating status, and the outdoor fan in the heat pump water-heating machine stops
Only run.
9. a kind of heat pump water-heating machine, which is characterized in that including the heat pump water-heating machine according to any one of claim 5-8
Defrosting control device.
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| CN110567098A (en) * | 2019-09-23 | 2019-12-13 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device, air conditioner and storage medium |
| CN111059700B (en) * | 2019-12-24 | 2021-01-15 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
| CN111692710B (en) * | 2020-06-24 | 2021-09-21 | 宁波奥克斯电气股份有限公司 | Control method for preventing freezing and defrosting and air conditioner |
| CN115235045B (en) * | 2022-07-28 | 2024-01-16 | 珠海格力电器股份有限公司 | Defrosting control parameter adjustment method and device, computer equipment and storage medium |
| CN115289731A (en) * | 2022-08-05 | 2022-11-04 | 珠海格力电器股份有限公司 | Defrosting control method and device and heat pump unit |
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| JPH01273750A (en) * | 1988-04-23 | 1989-11-01 | Nippon Denso Co Ltd | Vehicle defroster controller |
| JP2006023005A (en) * | 2004-07-07 | 2006-01-26 | Denso Corp | Heat pump type water heater |
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