CN106871510A - A kind of accurate defrosting heat pump system - Google Patents
A kind of accurate defrosting heat pump system Download PDFInfo
- Publication number
- CN106871510A CN106871510A CN201510908521.1A CN201510908521A CN106871510A CN 106871510 A CN106871510 A CN 106871510A CN 201510908521 A CN201510908521 A CN 201510908521A CN 106871510 A CN106871510 A CN 106871510A
- Authority
- CN
- China
- Prior art keywords
- compressor
- evaporator
- valve
- control centre
- defrost
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010257 thawing Methods 0.000 title claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 230000008020 evaporation Effects 0.000 claims 1
- 238000001704 evaporation Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- 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
- F25B47/022—Defrosting cycles hot gas defrosting
-
- 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
- F25B49/022—Compressor control arrangements
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/07—Exceeding a certain pressure value in a refrigeration component or cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/027—Compressor control by controlling pressure
Abstract
The invention discloses a kind of accurate defrosting heat pump system, including outdoor unit, four-way reversing valve, compressor, vapour liquid separator, indoor set, expansion valve and control centre, outdoor unit is internally provided with evaporator, evaporator one end is connected with commutation four-way valve, the other end is connected by expansion valve with indoor set, temperature sensor is provided with the coil pipe of evaporator, temperature sensor is connected by holding wire with control centre, indoor set is internally provided with condenser, condenser one end is connected with expansion valve, the other end is connected with commutation four-way valve, compressor one end is connected with commutation four-way valve, the other end is connected by vapour liquid separator with four-way reversing valve, defrost switch is provided with the pipeline that vapour liquid separator is connected with compressor, defrost switch is connected by holding wire with control centre.The present invention switchs the pressure at expulsion of detection compressor by setting defrost, so as to realize to defrost and the precise control for exiting.
Description
Technical field
The present invention relates to the Defrost technology of heat-pump air-conditioner, more specifically it is related to a kind of accurate defrosting heat pump
System.
Background technology
In refrigeration systems, frosting is one of most common phenomenon in system operation.Heat in heating operation
Pump air-conditioning, when evaporator surface temperature is less than zero degree, heat exchanger surface occurs frost, heat transfer sheet
Frost accumulated on face will block air duct and reduce heat transfer area, the flow resistance of air as removed not in time
Significantly increase, heat exchange efficiency reduction declines unit overall performance.
At present, reverse cycle defrosting is one of most widely used Defrost method.During reverse cycle defrosting, room
External heat exchanger is changed into condenser, and indoor heat exchanger is changed into evaporator.Unit takes heat and melts frost layer from indoor environment,
Cause the temperature reduction of indoor water system.On the other hand, in order to ensure defrosting efficiency, room during defrosting
Exogenous wind office closes, to ensure that the heat that compressor work and refrigerant phase transition process are produced all is used to defrost, but
Such result be temperature change drastically, high-voltage problem may be triggered because of the hysteresis quality of sensor response.
Further, since the control logic of existing defrosting mode is with heat time, environment temperature, coil temperature as defeated
Enter variable, be made whether defrost and whether the output order that defrost terminates.When there is the non-frosting of evaporator or light
Micro- frosting etc. frequently defrost phenomenon when, reached according to coil temperature exit defrost set temperature when just exit defrosting
Control logic, can cause defrost post-set time it is long, report high voltage fault the shortcomings of, cause hot water temperature to decline
Hurry up, influence unit heating efficiency, it is especially serious in cold low humidity climatological region high.
Therefore, a kind of accurate defrosting heat pump system and its control method are needed badly, can be by physical method judgementization
Frost action post-set time, it is to avoid because the erroneous judgement that the sensitivity of sensor and other unconventional failures trigger is moved
The influence hot water such as long-time defrosting, high voltage fault made and trigger heats speed and efficiency.
The content of the invention
A kind of defect it is an object of the invention to overcome prior art, there is provided accurate defrosting heat pump system,
Defrost post-set time is optimized, it is to avoid high voltage fault and influence heating effect.
The technical scheme is that：
A kind of accurate defrosting heat pump system, including it is outdoor unit, four-way reversing valve, compressor, indoor set, swollen
Swollen valve and control centre, wherein, outdoor unit is internally provided with evaporator, and evaporator one end is commutated with four-way
Valve is connected, and the other end is connected by expansion valve with indoor set, and temperature sensor is provided with evaporator pipeline,
Temperature sensor is connected by holding wire with control centre, and indoor set is internally provided with condenser, condenser one
End is connected with expansion valve, and the other end is connected with four-way reversing valve, and compressor one end is connected with four-way reversing valve,
The other end is connected by vapour liquid separator with four-way reversing valve, wherein, vapour liquid separator is connected with compressor
Defrost switch is provided with pipeline, defrost switch is connected by holding wire with control centre.
Blower fan is provided with outside outdoor unit, blower fan is corresponding with the air inlet of outdoor unit to be installed.
A kind of defrosting control method, it includes the exit step that defrosts：
Defrosting mode is opened, and compressor is out of service, and commutation four-way valve changes into refrigeration mode by heating mode,
Compressor start, defrosting starts, while defrost starts to detect pressure signal, when pressure reaches 2.4MPa
When, defrost switches off compressor power supply circuit, exits defrosting, and commutation four-way valve is changed into by refrigeration mode
Heating mode, because of compressor shutdown, system compresses are rebalanced, when pressure value is less than 1.8Mpa, compression
Machine Power resumption, continues to run with according to present mode.
Beneficial effects of the present invention：
The present invention is switched by setting defrost on the discharge duct of compressor, when whole system is defrosted,
Defrosting starts, and the high temperature refrigerant gas of compressor is entered into evaporator, and to the low temperature on the outside of evaporator
Frost layer heat release, gradually melts, after frost layer heat absorption until come off, be finally evaporated；And work as pressure and reach 2.4MPa
When, defrost switches off compressor power supply circuit, exits defrosting, so as to prevent the reaction spirit because sensor
Defrosted caused by sensitivity and sensor contacts are bad and do not exited for a long time, because of system high pressure caused by defrosting
Failure, so as to improve the security and stability of system, reduces the meaningless thermal loss of system, lifting
Heating effect.
Brief description of the drawings
Fig. 1 is the connection diagram of each device provided in an embodiment of the present invention.
In figure, 1- outdoor units, 2- blower fans, 3 four-way reversing valves, 4- compressors, 5- indoor sets, 6- expansion valves,
7- control centres, 8- defrosts switch, 9- vapour liquid separators.
Specific embodiment
The technical scheme of the application is clearly and completely described below in conjunction with embodiment, it is clear that institute
The embodiment of description is only a part of embodiment of the invention, rather than whole embodiments.Based on the present invention
In embodiment, it is all that those of ordinary skill in the art are obtained under the premise of creative work is not made
Other embodiments, belong to the scope of protection of the invention.
Such as Fig. 1, a kind of accurate defrosting heat pump system, including outdoor unit 1, four-way reversing valve 3, compressor 4,
Indoor set 5, expansion valve 6 and control centre 7, outdoor unit are internally provided with evaporator, the effect of evaporator
It is by absorbing the heat of surrounding environment compression, liquefied refrigerant vapor, gaseous state being changed into from liquid.
Evaporator one end is connected with commutation four-way valve, and the other end is connected by expansion valve with indoor set, evaporator pipeline
On be provided with temperature sensor (accompanying drawing without display), temperature sensor is connected by holding wire with control centre,
And indoor set is internally provided with condenser, the effect of condenser just with evaporator conversely, be will be gaseous
Refrigerant is changed into liquefaction and releases heat simultaneously, and a water tank is set on the position, make water in water tank with
Condenser produces heat exchange, forms heating operations.Condenser one end is connected with expansion valve 6, the other end with change
Connected to four-way valve 3, compressor one end is connected with commutation four-way valve, the other end passes through vapour liquid separator and changes
Connected to four-way valve, wherein, the effect of vapour liquid separator 9 is, by the gas phase and liquid phase separation of refrigerant, to protect
Card compressor in should not enter liquid refrigerants, prevent compressor because liquid hammer and caused by damage.
First it is that evaporator absorbs the heat of surrounding environment and refrigerant vapor in general heating operations,
Refrigerant after gasification enters into vapour liquid separator 9 by the four-way valve 3 that commutates, and commutation four-way valve now is as schemed
Shown in solid, vapour liquid separator is separated part unvaporized in refrigerant, it is to avoid it enters compressor,
The vaporised refrigerant of HTHP is further become by the refrigerant of gasification after compressor, then by commutation
Four-way valve is entered into condenser, and now the vaporised refrigerant of HTHP becomes normal temperature high voltage liquefied refrigerant,
The process can be heated along with the release of amount of heat to the medium of surrounding, complete heating operations,
And normal temperature high voltage liquefied refrigerant is further transformed into the liquefied refrigerant of Room-temperature low-pressure by expansion valve, finally
Evaporator is flowed back to, so as to complete a heating operations.During this, when evaporator is in cold low humidity gas high
When waiting environment, evaporator surface can slowly form frost layer, now be passed by being arranged at the temperature of evaporator coil
Sensor carries out temperature detection, and when temperature is less than certain value, control centre sends defrosting alarm, now can be with
Commutation four-way valve is commutated manually, at this can also commutation four-way valve be arranged to automatic type, and with control in
The heart connect, realize control centre send defrosting alarm after automatic reverse.After commutation four-way valve commutation, such as Fig. 1
Direction shown in dotted line switches, and condenser is transformed into evaporator, and evaporator is then transformed into condenser, i.e. system
Refrigeration mode is transformed into by original heating mode, the vaporizing system of the HTHP for now being discharged by compressor
Condenser (former evaporator) that cryogen is entered into after transformation and to around discharging heat, its defrosting heat flow density
Greatly, frost layer is melted from inside to outside, and defrosting speed is fast.
But, because under cold low humidity climatic environment high, evaporimeter frosting speed is slow, even if causing evaporator to exist
In the case of normal service requirement can be met also due to a small amount of frosting and enter defrosting mode, cause to enter
After defrosting, coil temperature amplitude of variation steeply rises, more than the response sensitivity of sensor, so as to cause
The phenomenon that exit criteria is not exited also is reached, defrosting time has been increased and is improve system pressure, so as to draw
Hair high-pressure phenomena, therefore defrost switch 8 is set, defrost switch 8 is entering defrosting mode, compressor start
After detected, when pressure value be 2.4MPa when, now can be regarded as frosting and eliminated, then defrost switch
8 send to control centre pressure signal, and control centre carries out compulsory withdrawal to defrosting, and controls commutation four
Port valve commutates, and defrost pattern switchs to heating mode, and defrost terminates.When pressure value is less than 1.8MPa, recover
The power supply of compressor, makes system normally run, by the material characteristic of the change of compressor pressure value, accurately
Ground control defrost terminates, it is to avoid because of system defrosting caused by the factors such as sensor response sensitivity and loose contact
Time is long and system high pressure failure.
Claims (2)
1. a kind of accurate defrosting heat pump system, including outdoor unit, four-way reversing valve, compressor, vapour-liquid point
From device, indoor set, expansion valve and control centre, described outdoor unit is internally provided with evaporator, evaporation
Device one end is connected with commutation four-way valve, and the other end is connected by expansion valve with indoor set, described evaporator
Temperature sensor is provided with coil pipe, temperature sensor is connected by holding wire with control centre, described room
Interior machine is internally provided with condenser, and condenser one end is connected with expansion valve, and the other end is connected with four-way reversing valve,
Described compressor one end is connected with four-way reversing valve, and the other end is connected by vapour liquid separator with four-way reversing valve
Connect, it is characterised in that：Defrost switch is provided with the pipeline that described vapour liquid separator is connected with compressor,
Defrost switch is connected by holding wire with control centre.
2. accurate defrosting heat pump system according to claim 1, it is characterised in that：Described outdoor unit
Outside is provided with blower fan, and temperature sensor is provided with described evaporator pipeline, and temperature sensor is by letter
Number line is connected with control centre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510908521.1A CN106871510A (en) | 2015-12-10 | 2015-12-10 | A kind of accurate defrosting heat pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510908521.1A CN106871510A (en) | 2015-12-10 | 2015-12-10 | A kind of accurate defrosting heat pump system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106871510A true CN106871510A (en) | 2017-06-20 |
Family
ID=59237629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510908521.1A Pending CN106871510A (en) | 2015-12-10 | 2015-12-10 | A kind of accurate defrosting heat pump system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106871510A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114234368A (en) * | 2021-12-27 | 2022-03-25 | 珠海格力电器股份有限公司 | Control method, control device, and nonvolatile storage medium |
| CN115247910A (en) * | 2022-06-28 | 2022-10-28 | 浙江中广电器集团股份有限公司 | Method for controlling overhigh pressure in defrosting process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767927A (en) * | 2012-07-09 | 2012-11-07 | 江苏西格玛电器有限公司 | Intelligent fuzzy control defrosting device |
| CN104567150A (en) * | 2014-12-01 | 2015-04-29 | 广东长菱空调冷气机制造有限公司 | Heat pump water heater defrosting control method and heat pump water heater using method |
| CN205448433U (en) * | 2015-12-10 | 2016-08-10 | 广东纽恩泰新能源科技发展有限公司 | Accurate defrosting heat pump system |
-
2015
- 2015-12-10 CN CN201510908521.1A patent/CN106871510A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102767927A (en) * | 2012-07-09 | 2012-11-07 | 江苏西格玛电器有限公司 | Intelligent fuzzy control defrosting device |
| CN104567150A (en) * | 2014-12-01 | 2015-04-29 | 广东长菱空调冷气机制造有限公司 | Heat pump water heater defrosting control method and heat pump water heater using method |
| CN205448433U (en) * | 2015-12-10 | 2016-08-10 | 广东纽恩泰新能源科技发展有限公司 | Accurate defrosting heat pump system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114234368A (en) * | 2021-12-27 | 2022-03-25 | 珠海格力电器股份有限公司 | Control method, control device, and nonvolatile storage medium |
| CN115247910A (en) * | 2022-06-28 | 2022-10-28 | 浙江中广电器集团股份有限公司 | Method for controlling overhigh pressure in defrosting process |
| CN115247910B (en) * | 2022-06-28 | 2024-04-02 | 浙江中广电器集团股份有限公司 | Method for controlling excessive pressure in defrosting process |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170620 |