CN104764263A - Defrosting control method and device of heat pump system - Google Patents
Defrosting control method and device of heat pump system Download PDFInfo
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- CN104764263A CN104764263A CN201410004345.4A CN201410004345A CN104764263A CN 104764263 A CN104764263 A CN 104764263A CN 201410004345 A CN201410004345 A CN 201410004345A CN 104764263 A CN104764263 A CN 104764263A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting control method of a heat pump system. The method comprises the following steps: when the defrosting access condition is satisfied in the heating operation process of the heat pump system, the heat pump system is controlled to enter the bypass defrosting, and the defrosting operation time is recorded; the tube temperature T5 of an outdoor heat exchanger is continuously obtained in the defrosting operation, when the T5 is greater than the first tube temperature threshold satisfied in the defrosting exit, or the defrosting operation lasting time is greater than t4, the heat pump system is controlled to exit the defrosting; the tube temperature T5 is the tube temperature in an inlet of the outdoor heat exchanger in the defrosting operation; and when the condition of exiting the defrosting at present is that the defrosting operation lasting time is greater than t4, the present t4 is added with a preset value. The invention further discloses a defrosting control device of the heat pump system. The method and the device optimize the bypass defrosting, and improves the defrosting capacity, so that the defrosting times are reduced, and the operation reliability of an air conditioner is improved.
Description
Technical field
The present invention relates to heat pump field, particularly relate to a kind of defrosting control method and device of heat pump.
Background technology
Heat pump air conditioner when heating operation in, cold-producing medium by outdoor heat exchanger and outdoor air generation heat exchange, absorption of air heat and evaporating outdoor.The cold-producing medium of compressor to low-temp low-pressure compresses, and forms the refrigerant vapour of HTHP, enters indoor heat exchanger heat release.Release heat by indoor heat exchanger and carry out heating indoor air, make people enjoy pleasant environment.
But owing to absorbing heat in outdoor heat exchanger outdoor air, outdoor heat exchanger environment temperature is lower, and the steam in air can condense into frost and be attached to outdoor heat exchanger surface, thus affects the exchange capability of heat of outdoor heat exchanger, and then affects the comfortableness of people.
In order to solve the defrosting problem of above-mentioned air-conditioner, the bypass defrosting mode that adopts defrosts more at present, and is usually provided with fixing defrosting post-set time in prior art, namely when the bypass defrosting duration reaches Preset Time, then and compulsory withdrawal bypass defrosting.But because this compulsory withdrawal defrost will cause this defrosting effect poor, defrosting next time will soon be entered.Thus defrosting number of times is increased, affect heat transfer effect, even influential system reliability of operation.
Summary of the invention
The main purpose of the embodiment of the present invention is to provide a kind of defrosting control method and device of heat pump, is intended to optimize bypass defrosting, improves the ability of defrost, reduces the number of times of defrost, improves air-conditioner reliability of operation.
For reaching above object, embodiments providing a kind of defrosting control method of heat pump, comprising the following steps:
When meeting defrost entry condition in heat pump heating process, controlling heat pump and carrying out bypass defrosting, recording the running time of defrost simultaneously;
Defrost constantly obtains outdoor heat exchange organ pipe temperature T5 when running, and when T5 is greater than the first pipe temperature threshold value met when defrost is exited, or when detecting that the duration of operation of defrost is greater than t4, controls heat pump and exits defrost; The Guan Wen of outdoor heat exchanger porch when described pipe temperature T5 is refrigerating operaton;
When being when detecting that the duration of operation of defrost is greater than t4 when the secondary condition exiting defrost, then current t4 is increased preset value.
Preferably, when meeting defrost entry condition in heat pump heating process, control heat pump and carry out bypass defrosting, the step simultaneously recording the running time of defrost specifically comprises:
Obtain the pipe temperature T3 of outdoor heat exchanger in the compressor start heating operation t1-t2 time period, and by the minimum of a value of t1-t2 time period T3, be recorded as T30; The Guan Wen in outdoor heat exchanger exit when described pipe temperature T3 is refrigerating operaton;
Obtain the pipe temperature T5 of described outdoor heat exchanger after obtaining the compressor operating t3 time, and calculate △ T=T30-T5, wherein t3>t2;
When △ T is more than or equal to the temperature difference threshold value met when defrost enters, controls heat pump and carry out bypass defrosting, record the running time of defrost simultaneously.
Preferably, described control heat pump also comprises after exiting defrost:
Control compressor and restart heating operation, and record its defrost number of times;
After described defrost number of times reaches n time, control heat pump and carry out the tangential defrost of cross valve, record the running time of defrost simultaneously;
Defrost constantly obtains outdoor heat exchange organ pipe temperature T3 when running, when the pipe temperature T3 obtained rises and gradually higher than the second preset pipe temperature threshold value, or when the pipe temperature T3 obtained rise gradually and higher than the 3rd preset pipe temperature threshold value and lasting more than t5 time, or when being greater than t6 the running time of defrost, controlling heat pump and exiting the tangential defrost of cross valve; Wherein t5<t6.
Preferably, described control heat pump also comprises after exiting the tangential defrost of cross valve:
T4 is returned to default initial value.
Accordingly, the embodiment of the present invention additionally provides a kind of defrosting control device of heat pump, comprising:
Defrost enters processing module, for when meeting defrost entry condition in heat pump heating process, controlling heat pump and carrying out bypass defrosting, recording the running time of defrost simultaneously;
Temperature acquisition module, for obtaining the pipe temperature T5 of outdoor heat exchanger; The Guan Wen of outdoor heat exchanger porch when described pipe temperature T5 is refrigerating operaton;
Processing module is exited in defrost, during for being greater than the first pipe temperature threshold value met when defrost is exited as T5, or when detecting that the duration of operation of defrost is greater than t4, controlling heat pump and exits defrost; And when being when detecting that the duration of operation of defrost is greater than t4 when the secondary condition exiting defrost, then current t4 is increased preset value.
Preferably, temperature acquisition module also for the pipe temperature T3 that obtains outdoor heat exchanger in the compressor start heating operation t1-t2 time period, and by the minimum of a value of t1-t2 time period T3, is recorded as T30; The Guan Wen in outdoor heat exchanger exit when described pipe temperature T3 is refrigerating operaton;
Defrost enter processing module specifically for: calculate △ T=T30-T5, and when △ T is more than or equal to the temperature difference threshold value met when defrost enters, control heat pump carries out bypass defrosting, records the running time of defrost simultaneously; The pipe temperature T5 of outdoor heat exchanger, wherein t3>t2 when wherein T5 is compressor operating t3 time.
Preferably, described defrost exit processing module also for: after heat pump exits defrost in control, control compressor and restart heating operation, and record its defrost number of times; Under the tangential defrost of cross valve runs, when the pipe temperature T3 obtained rises and gradually higher than the second preset pipe temperature threshold value, or when the pipe temperature T3 obtained rise gradually and higher than the 3rd preset pipe temperature threshold value and lasting more than t5 time, or when reaching t6 the duration of operation of defrost, controlling heat pump and exiting the tangential defrost of cross valve; Wherein t5<t6;
Described defrost enter processing module also for: after described defrost number of times reaches n time, control heat pump carry out the tangential defrost of cross valve, record the running time of defrost simultaneously;
Temperature acquisition module constantly obtains the pipe temperature T3 of outdoor heat exchanger when also running for the tangential defrost of: cross valve.
Preferably, described defrost is exited processing module and also after heat pump exits the tangential defrost of cross valve, t4 is returned to default initial value for controlling.
Whether the present invention is the bypass defrosting duration be greater than t4 by the condition judging bypass defrosting and exit, and is when the bypass defrosting duration being greater than t4 in the condition that bypass defrosting exits, and current t4 is increased preset value; Thus effectively optimize bypass defrosting, improve the ability of defrost, and then decrease the number of times of defrost, improve air-conditioner reliability of operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the air-conditioning system of the defrosting control method application of heat pump of the present invention;
Fig. 2 is the schematic flow sheet of defrosting control method first embodiment of heat pump of the present invention;
Fig. 3 is the schematic flow sheet of defrosting control method second embodiment of heat pump of the present invention;
Fig. 4 is the schematic flow sheet of defrosting control method the 3rd embodiment of heat pump of the present invention;
Fig. 5 is the schematic flow sheet of defrosting control method the 4th embodiment of heat pump of the present invention;
Fig. 6 is the high-level schematic functional block diagram of the defrosting control device preferred embodiment of heat pump of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Technical scheme of the present invention is further illustrated below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Air-conditioning system is that example is described by the heat pump in the defrosting control method of the heat pump that the embodiment of the present invention proposes.As shown in Figure 1, this air-conditioning system comprises cross valve 1, indoor heat exchanger 2, bypass solenoid valve 3, throttling arrangement 4, outdoor heat exchanger temperature-sensitive bag 51, outdoor heat exchanger temperature-sensitive bag 52, outdoor heat exchanger humidity sensor 53, outdoor heat exchanger 6, compressor body 7, compressor liquid storage device 8, exhaust outlet of compressor 71, compressor liquid storage device air inlet 81.Wherein, when outdoor heat exchanger temperature-sensitive bag 51 is arranged on refrigerating operaton outdoor heat exchanger 6 entrance near, for the pipe temperature T5 of sensing chamber's external heat exchanger 6.When outdoor heat exchanger temperature-sensitive bag 52 is arranged on refrigerating operaton outdoor heat exchanger 6 outlet near, for the pipe temperature T3 of sensing chamber's external heat exchanger 6.Certain heat pump is not limited to air-conditioning system, and other heat pumps with identical function are also within the protection domain of the embodiment of the present invention.Be understandable that, in above-mentioned air-conditioner, when outdoor heat exchanger temperature-sensitive bag 51 is arranged on heating operation outdoor heat exchanger 6 outlet near, when outdoor heat exchanger temperature-sensitive bag 52 is arranged on heating operation outdoor heat exchanger 6 entrance near.
With reference to Fig. 2, the invention provides a kind of defrosting control method of heat pump, comprise the following steps:
Step S110, when meeting defrost entry condition in heat pump heating process, control heat pump carry out bypass defrosting, record the running time of defrost simultaneously;
Particularly, above-mentioned defrost condition can be arranged according to actual needs, such as, by the pipe temperature T3 of sensing chamber's external heat exchanger, controls heat pump enter bypass defrosting according to the size of pipe temperature T3.
Step S120, defrost constantly obtain outdoor heat exchange organ pipe temperature T5 when running, and when T5 is greater than the first pipe temperature threshold value preset when defrost is exited, or when detecting that the running time of defrost is greater than t4, controls heat pump and exit defrost;
Controlling heat pump carries out in the process of bypass defrosting, by the pipe temperature T5 of continuous sensing chamber external heat exchanger, and judge the condition (duration of operation when the first pipe temperature threshold value met when defrost is exited or defrost are exited) that whether meets the running time of T5 or defrost when defrost is exited.Such as, judge that T5 is greater than the first pipe temperature threshold value met when defrost is exited, or when judging to be greater than t4 duration of operation when defrost is exited the duration of operation of defrost, then control heat pump exits defrost, enters commonly to heat state.
Step S130, when being when detecting that the duration of operation of defrost is greater than t4 when the condition time exiting defrost, then current t4 is increased preset value.
When after exiting bypass defrosting, will judge when secondary exiting judges whether defrost is that if so, then judge that the current defrost time is shorter, defrost is complete not because be greater than t4 the duration of operation of defrost.Then need the time t4 increasing compulsory withdrawal defrost, thus make upper once enter bypass defrosting time reach good defrost effect.Such as when first time enters bypass defrosting, the preset initial value of t4 is 10 minutes, if when the secondary condition exiting bypass defrosting is greater than 10 minutes at the bypass defrosting duration.Then t4 amendment is adjusted to 12 minutes, after entering bypass defrosting next time, when T5 is greater than the first pipe temperature threshold value met when defrost is exited, or when detecting that the duration of operation of defrost is greater than 12 minutes, controls heat pump and exit defrost.
Whether the present invention is the bypass defrosting duration be greater than t4 by the condition judging bypass defrosting and exit, and is when the bypass defrosting duration being greater than t4 in the condition that bypass defrosting exits, and current t4 is increased preset value; Thus effectively optimize bypass defrosting, improve the ability of defrost, and then decrease the number of times of defrost, improve air-conditioner reliability of operation.
Further, with reference to Fig. 3, defrosting control method second embodiment of heat pump of the present invention is proposed.Namely above-mentioned steps S110 comprises:
Step S111, obtain the pipe temperature T3 of outdoor heat exchanger in the compressor start normal heating operation t1-t2 time period, and by the minimum of a value of t1-t2 time period T3, be recorded as T30;
In the present embodiment, can detect the pipe temperature T3 of outdoor heat exchanger in the t1-t2 time period under the normal heating operation of compressor, the detection of this pipe temperature T3 is detected in real time by the temperature-sensitive bag 52 on heat exchanger disposed in the outdoor.And then minimumly in relatively detected all T3 values be recorded as T30.Arranging minimum of a value T30 is herein because T5 relative minimum T30 also will low △ T(△ T=T30-T5) time, can ensure that outdoor heat exchanger is the defrost when having white, prevent the generation of frostless defrost phenomenon, more accurately can judge outdoor heat exchanger frosting situation, thus realize accurately controlling defrost.
Step S112, judge whether the running time of compressor reaches t3; Be proceed to step S113, otherwise proceed to step S112;
The pipe temperature T5 of step S113, acquisition outdoor heat exchanger, and calculate △ T=T30-T5;
T30 is the minimum of a value by the Guan Wen of the outdoor heat exchanger detected by temperature-sensitive bag 52 within the compressor start heating operation t1-t2 time period; T5 is the Guan Wen by the outdoor heat exchanger detected by temperature-sensitive bag 51 after the compressor start heating operation t3 time.Wherein, t1, t2, t3 are all relative to time during compressor start, and t1<t2<t3.And pipe temperature T5 is also real-time detection.
Step S114, judge whether △ T is more than or equal to temperature difference threshold value preset when defrost enters; Be proceed to step S115, otherwise proceed to step S113;
Step S115, control heat pump carry out bypass defrosting, record the running time of defrost simultaneously;
Control heat pump and carry out bypass defrosting, such as by-passing valve is opened, and exhaust directly enters outdoor heat exchanger entrance and carries out defrost.Meanwhile, the running time of defrost is recorded.
After above-mentioned control heat pump exits defrost, normal heating operation can be restarted, and circulation performs the control flow of above-mentioned defrost.And in order to ensure that defrost is clean under any humidity condition, do not affect the comfortableness that user uses, present invention also offers another embodiment of defrosting control method of heat pump.As shown in Figure 4, on the basis of a upper embodiment (i.e. the second embodiment), third embodiment of the invention also comprises after control heat pump exits defrost (i.e. above-mentioned steps S130):
Step S140, defrost number of times to be counted, control heat pump and start normal heating operation;
When controlling heat pump and exiting defrost, record its defrost number of times, namely defrost number of times counts from 0.Meanwhile, control heat pump and start normal heating operation.
Step S150, judge whether defrost number of times reaches n time; Proceed to step S160, otherwise, return step S110;
Step S160, control heat pump carry out the tangential defrost of cross valve, record the running time of defrost simultaneously;
In the present embodiment, n is 10.Namely when defrost number of times reaches 10 times, then special defrost pattern is adopted.Namely control heat pump and carry out the tangential defrost of cross valve.Be specially: when defrost starts, compressor frequency reducing runs, and cross valve, indoor fan, outdoor fan are closed.Then compressor raising frequency is to defrost frequency shelves, enters defrost.Record the running time of defrost simultaneously.
Step S170, defrost constantly obtain outdoor heat exchange organ pipe temperature T3 when running, when the pipe temperature T3 obtained rises and gradually higher than the second preset pipe temperature threshold value, or when the pipe temperature T3 obtained rise gradually and higher than the 3rd preset pipe temperature threshold value and lasting second more than preset time t5 time, or when reaching the 3rd preset time t6 the running time of defrost, controlling heat pump and exiting the tangential defrost of cross valve.
Controlling heat pump carries out in the process of the tangential defrost of cross valve, by the pipe temperature T3 of continuous sensing chamber external heat exchanger, and judges whether meet condition when defrost is exited the running time of pipe temperature T3 or defrost:
1. when the pipe temperature T3 of outdoor heat exchanger rises and higher than second pipe temperature threshold value (such as, 18 DEG C);
2. when the pipe temperature T3 of outdoor heat exchanger rises and higher than the 3rd pipe temperature threshold value (such as, 8.0 DEG C) and lasting second preset time t5(such as, 80 seconds) time;
3. when defrost continues the 3rd preset time t6(such as, 15 minutes running time) time.
As long as meet above-mentioned arbitrary condition, heat pump can be controlled and exit the tangential defrost of cross valve.Wherein, t5<t6.
Further, reference Fig. 5, Fig. 5 is the schematic flow sheet of defrosting control method the 4th embodiment of heat pump of the present invention; Based on the 3rd embodiment, in the fourth embodiment, after performing the control heat pump in above-mentioned steps S180 and exiting the tangential defrost of cross valve, also comprise:
Step S180, returns to default initial value by t4.In the present embodiment, after carrying out the tangential defrost of cross valve, t4 can be returned to 10 minutes, thus restoring system, ensure the stability of system cloud gray model.
It is below defrosting control method one application example of heat pump of the present invention.
Such as, t1 was 7 minutes in section, t2 is 12 minutes detection time of the pipe temperature T3 of outdoor heat exchanger, beginning t3 detection time of the pipe temperature T5 of outdoor heat exchanger is 25 minutes, the temperature difference threshold value met when defrost enters is 5.5 DEG C, the the first pipe temperature threshold value met when defrost is exited is 4 DEG C, t4 running time of defrost when defrost is exited is 10 minutes, and above-mentioned preset value is 2 minutes.
In addition, in special defrost pattern, when defrost number of times is 10 times, enter special defrost pattern; The condition that defrost is exited is:
What meet following three conditions terminates special defrost first, restarts normal heating operation.
1. when the pipe temperature T3 of outdoor heat exchanger rises to higher than 18 DEG C;
2. when the pipe temperature T3 of outdoor heat exchanger rises to higher than value 8.0 DEG C and continue 80 seconds;
3. when lasting 15 minutes of running time of defrost.
The idiographic flow being carried out defrost by the control model of above-mentioned defrost is as follows:
Step 1: compressor start starts heating operation, starts timing;
Step 2: detect the compressor start normal heating operation t1=7 minute temperature value to t2=12 minutes section T3, and record the minimum of a value T30 of t1 to t2 time period T3;
Step 3: when air-conditioner set t running time reaches specified operation time tCDA1=25 minute, sensing chamber external heat exchanger pipe temperature T5, and calculate △ T, wherein △ T=T30-T5;
Step 4: when Δ T=T30-T5 >=5.5 DEG C, air-conditioner set enters defrost.
Step 5: continuous sensing chamber external heat exchanger pipe temperature T5 when defrost runs, when detecting that T5 is greater than 4 DEG C, or detect that defrost exits defrost process when being greater than 10 minutes running time, and when the reason exiting defrost is when the defrost time being greater than t4, then current t4 is adjusted to t4+2;
Step 6: record defrost number of times;
Step 7: when defrost number of times does not reach 10 times, then enter normal heating operation, restart timing.
Step 8: when defrost number of times reaches n=10 time, then control heat pump and enter special defrost pattern, and after special defrost pattern terminates, t4 is adjusted to 10 minutes.
Corresponding said method embodiment, the present invention also provides a kind of defrosting control device of heat pump, as shown in Figure 6.The defrosting control device of this heat pump comprises:
Defrost enters processing module 100, for when meeting defrost entry condition in heat pump heating process, controlling heat pump and carrying out bypass defrosting, recording the running time of defrost simultaneously;
Particularly, above-mentioned defrost condition can be arranged according to actual needs, such as, by the pipe temperature T5 of sensing chamber's external heat exchanger, controls heat pump enter bypass defrosting according to the size of pipe temperature T5.
Temperature acquisition module 200, for obtaining the pipe temperature T5 of outdoor heat exchanger;
Processing module 300 is exited in defrost, during for being greater than the first pipe temperature threshold value met when defrost is exited as T5, or when detecting that the duration of operation of defrost is greater than t4, controlling heat pump and exits defrost; And when being when detecting that the duration of operation of defrost is greater than t4 when the secondary condition exiting defrost, then current t4 is increased preset value.
Controlling heat pump carries out in the process of bypass defrosting, by the pipe temperature T5 of continuous sensing chamber external heat exchanger, and judge the condition (duration of operation when the first pipe temperature threshold value met when defrost is exited or defrost are exited) that whether meets the running time of T5 or defrost when defrost is exited.Such as, judge that T5 is greater than the first pipe temperature threshold value met when defrost is exited, or when judging to be greater than t4 duration of operation when defrost is exited the duration of operation of defrost, then control heat pump exits defrost, enters commonly to heat state.
When after exiting bypass defrosting, will judge when secondary exiting judges whether defrost is that if so, then judge that the current defrost time is shorter, defrost is complete not because be greater than t4 the duration of operation of defrost.Then need the time t4 increasing compulsory withdrawal defrost, thus make upper once enter bypass defrosting time reach good defrost effect.Such as when first time enters bypass defrosting, the preset initial value of t4 is 10 minutes, if when the secondary condition exiting bypass defrosting is greater than 10 minutes at the bypass defrosting duration.Then t4 amendment is adjusted to 12 minutes, after entering bypass defrosting next time, when T5 is greater than the first pipe temperature threshold value met when defrost is exited, or when detecting that the duration of operation of defrost is greater than 12 minutes, controls heat pump and exit defrost.
The present invention exits processing module 300 by defrost and judges whether the condition that bypass defrosting exits is the bypass defrosting duration be greater than t4, and is when the bypass defrosting duration being greater than t4 in the condition that bypass defrosting exits, and current t4 is increased preset value; Thus effectively optimize bypass defrosting, improve the ability of defrost, and then decrease the number of times of defrost, improve air-conditioner reliability of operation.
Further, based on above-described embodiment, in the present embodiment, said temperature acquisition module 200 also for the pipe temperature T3 that obtains outdoor heat exchanger in the compressor start heating operation t1-t2 time period, and by the minimum of a value of t1-t2 time period T3, is recorded as T30; The Guan Wen in outdoor heat exchanger exit when described pipe temperature T3 is refrigerating operaton;
Defrost enter processing module 100 specifically for: calculate △ T=T30-T5, and when △ T is more than or equal to the temperature difference threshold value met when defrost enters, control heat pump carries out bypass defrosting, records the running time of defrost simultaneously; The pipe temperature T5 of outdoor heat exchanger, wherein t3>t2 when wherein T5 is compressor operating t3 time.
Shown in Fig. 1, said temperature acquisition module 200 can comprise the temperature-sensitive bag 51 near heat exchanger entrance disposed in the outdoor and the temperature-sensitive bag 52 near heat exchanger exit disposed in the outdoor, to the pipe temperature T5, the T3 that are applied to sensing chamber's external heat exchanger; The control unit of temperature detection can certainly be carried out for the temperature-sensitive bag 51 of control room external heat exchanger and temperature-sensitive bag 52.In one embodiment, this temperature acquisition module 200 can arrange a timer, and the Guan Wen controlling temperature-sensitive bag 52 pairs of outdoor heat exchangers under the normal heating operation of compressor in the t1-t2 time period detects, to obtain pipe temperature T3.Also can when the compressor operating t3 time, the Guan Wen of Perceived control thermometer bulb 51 pairs of outdoor heat exchangers detects, to obtain pipe temperature T5.Can also when heat pump carry out defrost, the Guan Wen of Perceived control thermometer bulb 52 pairs of outdoor heat exchangers detects in real time, to obtain pipe temperature T3.In another embodiment, temperature-sensitive bag 51 and temperature-sensitive bag 52 also can the Guan Wen of sensing chamber's external heat exchanger in real time, and are sent in real time in the memory in heat pump and store.The temperature acquisition module 200 pipe temperature T5 that temperature-sensitive bag 51 detects when obtaining pipe temperature T3 that under the normal heating operation of compressor, in the t1-t2 time period, temperature-sensitive bag 52 detects, compressor operating t3 time from memory, and the pipe temperature T5 that temperature-sensitive bag 51 detects when heat pump carries out bypass defrosting.
Then defrost defrost enters processing module 100 and calculates △ T=T30-T5, and when △ T is more than or equal to the temperature difference threshold value met when defrost enters, control heat pump and carry out bypass defrosting, such as by-passing valve is opened, and exhaust directly enters outdoor heat exchanger entrance and carries out defrost.Record the running time of defrost simultaneously.And carry out in the process of bypass defrosting at control heat pump, temperature acquisition module 200 will constantly obtain the pipe temperature T5 of outdoor heat exchanger.The running time that processing module 300 judges T5 and defrost is exited in defrost, judges whether to exit defrost.Such as, judge that T5 is greater than the first pipe temperature threshold value met when defrost is exited, or when judging to be greater than t4 duration of operation when defrost is exited the duration of operation of defrost, then control heat pump and exit defrost.
After above-mentioned control heat pump exits defrost, normal heating operation can be restarted, and circulation performs the control flow of above-mentioned defrost.But in order to ensure that defrost is clean under any humidity condition, does not affect the comfortableness that user uses, present invention also offers another embodiment of defrosting control method of heat pump.Be specially:
Described defrost exit processing module 300 also for: after heat pump exits defrost in control, control compressor and restart heating operation, and record its defrost number of times; Under the tangential defrost of cross valve runs, when the pipe temperature T3 obtained rises and gradually higher than the second preset pipe temperature threshold value, or when the pipe temperature T3 obtained rise gradually and higher than the 3rd preset pipe temperature threshold value and lasting more than t5 time, or when reaching t6 the duration of operation of defrost, controlling heat pump and exiting the tangential defrost of cross valve; Wherein t5<t6;
Described defrost enter processing module 100 also for: after described defrost number of times reaches n time, control heat pump carry out the tangential defrost of cross valve, record the running time of defrost simultaneously;
Temperature acquisition module 200 constantly obtains the pipe temperature T3 of outdoor heat exchanger when also running for the tangential defrost of: cross valve.
Above-mentioned defrost exits processing module 300 when controlling heat pump and exiting defrost, and record its defrost number of times, namely defrost number of times counts from 0.Meanwhile, control heat pump and start normal heating operation.In the present embodiment, when defrost number of times reaches 10 times, then adopt special defrost pattern.Namely control heat pump and carry out the tangential defrost of cross valve.Be specially: when defrost starts, compressor frequency reducing runs, and cross valve, indoor fan, outdoor fan are closed.Then compressor raising frequency is to defrost frequency shelves, enters defrost.Record the running time of defrost simultaneously.
Controlling heat pump carries out in the process of the tangential defrost of cross valve, and temperature acquisition module 200 will constantly obtain the pipe temperature T3 of outdoor heat exchanger, exit processing module 300 judge whether meet condition when defrost is exited the running time of T3 or defrost for defrost:
1. when the pipe temperature T3 of outdoor heat exchanger rises and higher than second pipe temperature threshold value (such as, 18 DEG C);
2. when the pipe temperature T3 of outdoor heat exchanger rises and higher than the 3rd pipe temperature threshold value (such as, 8.0 DEG C) and lasting second preset time t5(such as, 80 seconds) time;
3. when defrost continues the 3rd preset time t6(such as, 15 minutes running time) time.
As long as meet above-mentioned arbitrary condition, heat pump can be controlled and exit the tangential defrost of cross valve.Wherein, t5<t6.
Further, based on above-described embodiment, in the present embodiment, above-mentioned defrost is exited processing module 300 and also be can be used for t4 to return to default initial value.In the present embodiment, after carrying out the tangential defrost of cross valve, t4 can be returned to 10 minutes, thus restoring system, ensure the stability of system cloud gray model.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that above-described embodiment method can add required general hardware platform by software and realize, hardware can certainly be passed through, but in a lot of situation, the former is better embodiment.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium (as ROM/RAM, magnetic disc, CD), comprising some instructions in order to make a station terminal equipment (can be mobile phone, computer, server, or the network equipment etc.) perform method described in each embodiment of the present invention.
The foregoing is only the preferred embodiments of the present invention; not thereby its scope of the claims is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; directly or indirectly be used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. a defrosting control method for heat pump, is characterized in that, comprises the following steps:
When meeting defrost entry condition in heat pump heating process, controlling heat pump and carrying out bypass defrosting, recording the running time of defrost simultaneously;
Defrost constantly obtains outdoor heat exchange organ pipe temperature T5 when running, and when T5 is greater than the first pipe temperature threshold value met when defrost is exited, or when detecting that the duration of operation of defrost is greater than t4, controls heat pump and exits defrost; The Guan Wen of outdoor heat exchanger porch when described pipe temperature T5 is refrigerating operaton;
When being when detecting that the duration of operation of defrost is greater than t4 when the secondary condition exiting defrost, then current t4 is increased preset value.
2. the defrosting control method of heat pump as claimed in claim 1, it is characterized in that, when meeting defrost entry condition in heat pump heating process, control heat pump and carry out bypass defrosting, the step simultaneously recording the running time of defrost specifically comprises:
Obtain the pipe temperature T3 of outdoor heat exchanger in the compressor start heating operation t1-t2 time period, and by the minimum of a value of t1-t2 time period T3, be recorded as T30; The Guan Wen in outdoor heat exchanger exit when described pipe temperature T3 is refrigerating operaton;
Obtain the pipe temperature T5 of described outdoor heat exchanger after obtaining the compressor operating t3 time, and calculate △ T=T30-T5, wherein t3>t2;
When △ T is more than or equal to the temperature difference threshold value met when defrost enters, controls heat pump and carry out bypass defrosting, record the running time of defrost simultaneously.
3. the defrosting control method of heat pump as claimed in claim 2, it is characterized in that, described control heat pump also comprises after exiting defrost:
Control compressor and restart heating operation, and record its defrost number of times;
After described defrost number of times reaches n time, control heat pump and carry out the tangential defrost of cross valve, record the running time of defrost simultaneously;
Defrost constantly obtains outdoor heat exchange organ pipe temperature T3 when running, when the pipe temperature T3 obtained rises and gradually higher than the second preset pipe temperature threshold value, or when the pipe temperature T3 obtained rise gradually and higher than the 3rd preset pipe temperature threshold value and lasting more than t5 time, or when being greater than t6 the running time of defrost, controlling heat pump and exiting the tangential defrost of cross valve; Wherein t5<t6.
4. the defrosting control method of heat pump as claimed in claim 3, it is characterized in that, described control heat pump also comprises after exiting the tangential defrost of cross valve:
T4 is returned to default initial value.
5. a defrosting control device for heat pump, is characterized in that, comprising:
Defrost enters processing module, for when meeting defrost entry condition in heat pump heating process, controlling heat pump and carrying out bypass defrosting, recording the running time of defrost simultaneously;
Temperature acquisition module, for obtaining the pipe temperature T5 of outdoor heat exchanger; The Guan Wen of outdoor heat exchanger porch when described pipe temperature T5 is refrigerating operaton;
Processing module is exited in defrost, during for being greater than the first pipe temperature threshold value met when defrost is exited as T5, or when detecting that the duration of operation of defrost is greater than t4, controlling heat pump and exits defrost; And when being when detecting that the duration of operation of defrost is greater than t4 when the secondary condition exiting defrost, then current t4 is increased preset value.
6. the defrosting control device of heat pump as claimed in claim 5, is characterized in that,
Temperature acquisition module also for the pipe temperature T3 that obtains outdoor heat exchanger in the compressor start heating operation t1-t2 time period, and by the minimum of a value of t1-t2 time period T3, is recorded as T30; The Guan Wen in outdoor heat exchanger exit when described pipe temperature T3 is refrigerating operaton;
Defrost enter processing module specifically for: calculate △ T=T30-T5, and when △ T is more than or equal to the temperature difference threshold value met when defrost enters, control heat pump carries out bypass defrosting, records the running time of defrost simultaneously; The pipe temperature T5 of outdoor heat exchanger, wherein t3>t2 when wherein T5 is compressor operating t3 time.
7. the defrosting control device of heat pump as claimed in claim 6, is characterized in that, described defrost exit processing module also for: after control heat pump exits defrost, control compressor and restart heating operation, and record its defrost number of times; Under the tangential defrost of cross valve runs, when the pipe temperature T3 obtained rises and gradually higher than the second preset pipe temperature threshold value, or when the pipe temperature T3 obtained rise gradually and higher than the 3rd preset pipe temperature threshold value and lasting more than t5 time, or when reaching t6 the duration of operation of defrost, controlling heat pump and exiting the tangential defrost of cross valve; Wherein t5<t6;
Described defrost enter processing module also for: after described defrost number of times reaches n time, control heat pump carry out the tangential defrost of cross valve, record the running time of defrost simultaneously;
Temperature acquisition module constantly obtains the pipe temperature T3 of outdoor heat exchanger when also running for the tangential defrost of: cross valve.
8. the defrosting control device of heat pump as claimed in claim 7, it is characterized in that, described defrost is exited processing module and also after heat pump exits the tangential defrost of cross valve, t4 is returned to default initial value for controlling.
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| CN106642595A (en) * | 2017-01-10 | 2017-05-10 | 美的集团武汉制冷设备有限公司 | Air conditioner and defrosting control method thereof |
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| CN108195026B (en) * | 2017-12-21 | 2020-05-26 | 广东美的暖通设备有限公司 | Defrosting control method, control device, air conditioner and readable storage medium |
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| CN112839482B (en) * | 2020-12-11 | 2024-05-31 | 青岛海尔新能源电器有限公司 | Heat pump unit and heat dissipation control method of controller |
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