CN202420019U - Air conditioning air-cooled heat pump unit - Google Patents
Air conditioning air-cooled heat pump unit Download PDFInfo
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- CN202420019U CN202420019U CN2011205406441U CN201120540644U CN202420019U CN 202420019 U CN202420019 U CN 202420019U CN 2011205406441 U CN2011205406441 U CN 2011205406441U CN 201120540644 U CN201120540644 U CN 201120540644U CN 202420019 U CN202420019 U CN 202420019U
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- defrost
- defrosting
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- temperature
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Abstract
The utility model provides an air conditioning air-cooled heat pump unit, which comprises an evaporator, a condenser, a compressor and a four-way valve, wherein the four-way valve is used for controlling that an exhaust port of the compressor is electively communicated with the evaporator or the condenser; a first temperature sensor for acquiring temperature of fins of the evaporator is arranged on a finned coil of the evaporator; a second temperature sensor for acquiring outdoor environment temperature is arranged on the fins of the evaporator; a defrosting controller is used for receiving the temperature signals transmitted by the first temperature sensor and the second temperature sensor the controlling the unit to defrost at a selected defrosting time interval according to the received temperature signals, and is provided with a first signal receiving end and a second signal receiving end; the first signal receiving end is connected with the first temperature sensor; and the second signal receiving end is connected with the second temperature sensor. Thus, the defrosting time interval is rational.
Description
Technical field
The utility model relates to a kind of Defrost method and air-conditioning Air-Cooled Heat Pump Unit of air-conditioning Air-Cooled Heat Pump Unit.
Background technology
The Along with people's growth in the living standard, the popularity rate of air-conditioner rises year by year.In refrigeration system, frosting is one of system's modal phenomenon in service.Be in the heat pump air conditioner of heating operation; When the evaporator surface temperature was lower than zero degree, the frosting phenomenon can appear in heat exchanger surface, long-pending frost on the heat exchange surface such as untimely removing; To stop up air duct and reduce heat transfer area; The flow resistance of air obviously increases, and heat exchange efficiency reduces, and the unit overall performance is descended.Is the key that maintenance system high efficiency rate is moved and in heat exchanger operation and cycle, control the defrosting time accurately with number of times.
The unit defrosting control method is varied, and a kind of method that generally adopts at present is: time-temperature method.Promptly when heating operation,, behind the operation certain hour, promptly start defrosting when evaporimeter reaches below the certain value in temperature.Owing on the basis of time quantum, considered the temperature amount, partly to have considered the influence of unit working environment, but still can not correctly reflect the influence of frosting unit performance, unnecessary defrosting running can appear, and also can be when needs defrost and do not send out the defrosting signal.
Time-temperature method receives the influence of environment temperature and air humidity bigger, and the speed of unit frosting is not only the function of time, and temperature, relative humidity that also depends on surrounding air etc. has related parameter.After unit start operation, be under the condition of different environment temperature and relative humidity, the speed of evaporator fin frosting has significant difference.Unit is under low temperature, high humidity environment, and frosting speed can be very fast, causes the evaporator surface temperature to reach setting value, but does not meet the demands running time, can not defrost, and the unclean problem of defrosting can occur and produce.Under higher in temperature, the low wet environment of unit; Frosting speed is slower, cause evaporator surface temperature and running time all to meet the demands, but the evaporator surface frosting seldom; And unit gets into Defrost operation, can cause the supply water fluctuation of water temperature of meaningless power consumption and user.Therefore the control of defrost interval time is unreasonable in the prior art.
The utility model content
To the one or more problems that exist in the correlation technique, the purpose of the utility model is to provide a kind of Defrost method, air-conditioning Air-Cooled Heat Pump Unit of air-conditioning Air-Cooled Heat Pump Unit, so that the defrost interval time is reasonable.
For realizing above-mentioned purpose; An aspect according to the utility model; A kind of Defrost method of air-conditioning Air-Cooled Heat Pump Unit is provided; Comprise: step 1: when unit is in running status, before starting defrosting, judge earlier that unit withdraws from the running time that picks up counting from defrosting last time and whether satisfies the defrost interval time; Step 2: if satisfy the defrost interval time; Then defrost; If do not satisfy then return step 1; The defrost interval time in the step 1 is confirmed as follows: when last time, defrosting was withdrawed from, detect the fin temperature of the evaporimeter of air-conditioning Air-Cooled Heat Pump Unit, and itself and design temperature are compared; When fin temperature during more than or equal to design temperature, accomplish required time according to defrosting last time, be defrost interval selection of time time value; And when fin temperature during less than design temperature, the selected defrost interval time is a fixed value.
Preferably, design temperature is 16 ℃, and fixed value is 30 minutes.
Preferably, when detected fin temperature >=16 ℃, and defrosting last time is when accomplishing required time＜2 minute, and then the defrost interval time is 90 minutes; When detected fin temperature >=16 ℃, and defrosting last time to accomplish required time be that then the defrost interval time was 60 minutes more than or equal to 2 minutes during less than 4 minutes; When detected fin temperature >=16 ℃, and defrosting last time to accomplish required time be that then the defrost interval time was 50 minutes more than or equal to 4 minutes during less than 6 minutes; When detected fin temperature >=16 ℃, and defrosting last time to accomplish required time be that then the defrost interval time was 40 minutes more than or equal to 6 minutes during less than 8 minutes; When detected fin temperature >=16 ℃, and defrosting last time is when accomplishing required time >=8 minute, and then the defrost interval time is 30 minutes.
Preferably, in step 2,, then carry out according to following steps 2-1 and step 2-2 if defrost:
Step 2-1: judge whether to meet simultaneously four conditions of following a-d and continue 3 minutes: the compressor continuous operating time of a. air-conditioning Air-Cooled Heat Pump Unit was greater than 20 minutes; B. fin temperature＜-7 of evaporimeter ℃; C. leaving water temperature >=18 ℃; D. the compressor continuous operating time is greater than the defrost interval time, and outdoor environment temperature is greater than 4 ℃ of the fin temperature of evaporimeter; Perhaps, the continuous operating time of compressor is greater than the defrost interval time, and the fin temperature of evaporimeter is less than-13 ℃; Perhaps, outdoor environment temperature is greater than 10 ℃ of the fin temperature of evaporimeter;
Step 2-2: if meet four conditions of a-d simultaneously and continue 3 minutes, then the air-conditioning Air-Cooled Heat Pump Unit is shut down, and gets into defrosting; If do not meet simultaneously, then return step 1.
Preferably, in step 2-2, if the air-conditioning Air-Cooled Heat Pump Unit gets into defrosting, withdraw from defrosting when then after getting into defrosting, satisfying one of following condition: fin temperature >=17 of e. evaporimeter ℃ also continue 1 minute, or fin temperature >=27 of evaporimeter ℃; F. defrosting time was above 8 minutes; G. leaving water temperature＜7 ℃.
Preferably, the utility model method is applicable to and decides frequency wind-cooled cold-water source pump.
On the other hand; The utility model also provides a kind of air-conditioning Air-Cooled Heat Pump Unit; Comprise: the cross valve that the exhaust outlet of evaporimeter, condenser, compressor and control compressor is communicated with evaporimeter or condenser selectively; Also comprise: gather first temperature sensor of the fin temperature of evaporimeter, be installed on the finned coil of evaporimeter; Gather second temperature sensor of outdoor environment temperature, be installed on the fin of evaporimeter; And receive the temperature signal of first and second temperature sensors transmission and control the defrost controller that unit defrosted with the selected defrost interval time according to the temperature signal that is received; Wherein, defrost controller has first signal receiving end that is connected with first temperature sensor, the secondary signal receiving terminal that is connected with second temperature sensor.
Preferably, defrost controller comprises: required time is accomplished in the fin temperature of detected evaporimeter and defrosting last time when withdrawing from according to defrosting last time, the defrost interval determination module of defrost interval time between confirming to defrost defrosting last time and next time; Judge that unit withdraws from the defrost interval judge module of whether satisfy running time that picks up counting from the defrosting last time defrost interval time, is connected with the defrost interval determination module; Satisfy defrost interval and judge whether to meet the defrost defrosting of entry condition during the time and start judge module when running time, be connected with the defrost interval judge module; And when meeting the defrosting entry condition, send the Defrost operation module that compressor shutdown signal and cross valve power-off signal and then startup compressor defrost, be connected with the defrost interval judge module.
Preferably, defrost controller also comprises: when Defrost operation satisfies the defrosting termination condition, send stopping signal and make unit finish module by heating the defrosting that starts operation again to compressor, be connected with the Defrost operation module.
Preferably, cross valve has first, second, third, fourth totally four ports, wherein; First port is communicated with the exhaust outlet of compressor; Second port is communicated with the air entry of compressor, and the 3rd port is communicated with evaporimeter, and the 4th port is communicated with condenser in the air-conditioning Air-Cooled Heat Pump Unit.
Preferably, the air-conditioning Air-Cooled Heat Pump Unit is fixed wind-cooled cold-water source pump frequently.
The beneficial effect of the utility model is:
Required time was accomplished in the fin temperature and defrosting last time of evaporimeter when the Defrost method of the utility model withdrawed from according to defrosting last time; Confirm the defrost interval time between defrosting last time and defrosting next time; Therefore can more reasonably control the defrost interval time, thereby the overall performance of air-conditioning Air-Cooled Heat Pump Unit is provided and guarantee high efficiency, the stable operation of unit.
The sensor that the air-conditioning Air-Cooled Heat Pump Unit of the utility model provides defrost controller and detected the sensor of evaporator fin temperature, detection outdoor environment temperature; Wherein defrost controller receives the temperature signal of first and second temperature sensors transmission and defrosts with the selected defrost interval time according to the temperature signal control unit that is received; Therefore the utility model can more reasonably be controlled the defrost interval time, thereby the overall performance of air-conditioning Air-Cooled Heat Pump Unit is provided and guarantees high efficiency, the stable operation of unit.
Description of drawings
Fig. 1 is the flow chart of the Defrost method of the utility model air-conditioning Air-Cooled Heat Pump Unit;
Fig. 2 is a flow chart of confirming the defrost interval time in the Defrost method of the utility model;
Fig. 3 is the part-structure sketch map of defrost controller in the utility model air-conditioning Air-Cooled Heat Pump Unit.
The specific embodiment
Below referring to accompanying drawing the specific embodiment of the utility model is described.
Referring to Fig. 1 and Fig. 2; The Defrost method of the air-conditioning Air-Cooled Heat Pump Unit of the utility model is described; It comprises: step 1: be in the air-conditioning Air-Cooled Heat Pump Unit under the situation of running status; Before starting defrosting, judge whether earlier to satisfy the defrost interval time, that is, judge that unit withdraws from the running time that picks up counting from defrosting last time and whether satisfies the defrost interval time; Step 2: if satisfy the defrost interval time said running time, then defrost, if do not satisfy the defrost interval time said running time then return above-mentioned steps 1.Wherein, the defrost interval time in the step 1 is confirmed as follows: when last time, defrosting was withdrawed from, detect the fin temperature of the evaporimeter of air-conditioning Air-Cooled Heat Pump Unit, and detected fin temperature and design temperature are compared; When detected fin temperature during more than or equal to design temperature, accomplishing required time according to defrosting last time is defrost interval selection of time time value, and defrosting last time of defrost interval basis of time is accomplished required time and difference; When detected fin temperature during less than design temperature, the selected defrost interval time is a fixed value, and defrost interval time this moment is not transformable value.Should be appreciated that described last time of defrosting is meant twice defrosting successively carrying out successively with defrosting next time, the defrosting of carrying out earlier is defrosting last time, after the defrosting carried out be defrosting next time; The described defrost interval time is meant: defrosting last time is withdrawn into the time period between defrosting beginning next time.
Continuation is referring to Fig. 1; In more detail; If satisfy the defrost interval time then defrost according to following steps 2-1 and step 2-2: step 2-1: judge whether to meet simultaneously four conditions of following a-d and continue 3 minutes: wherein, the compressor continuous operating time of a. air-conditioning Air-Cooled Heat Pump Unit was greater than 20 minutes; B. fin temperature＜-7 of evaporimeter ℃; C. leaving water temperature >=18 ℃; D. (1) compressor continuous operating time is greater than the defrost interval time, and outdoor environment temperature is greater than 4 ℃ of the fin temperature of evaporimeter; Perhaps, the continuous operating time of (2) compressor is greater than the defrost interval time, and the fin temperature of evaporimeter is less than-13 ℃; Perhaps, (3) outdoor environment temperature is greater than 10 ℃ of the fin temperature of said evaporimeter.Wherein (1) among the d-(3) are three conditions arranged side by side, and described four conditions are meant that a, b, three conditions of c add any condition in (1)-(3).Step 2-2: if meet four conditions of above-mentioned a-d simultaneously and continue 3 minutes, then the air-conditioning Air-Cooled Heat Pump Unit is shut down, and gets into defrosting; If do not meet described " four conditions of a-d also continue 3 minutes ", then return above-mentioned step 1.Continuation is referring to Fig. 1, in step 2-2, if the air-conditioning Air-Cooled Heat Pump Unit is shut down, gets into defrosting, then when satisfying one of following condition e, f, g, withdraws from defrosting: fin temperature >=17 of e. evaporimeter ℃ also continue 1 minute, or fin temperature >=27 of evaporimeter ℃; F. defrosting time was above 8 minutes; G. leaving water temperature＜7 ℃.
Referring to the flow chart of the embodiment of the definite defrost interval time shown in Fig. 2, the described design temperature of the utility model is made as 16 ℃, and above-mentioned fixed value was made as 30 minutes.Can find out that from Fig. 2 this flow process of confirming the defrost interval time is following: when last time defrosting is withdrawed from, if this moment detected evaporimeter fin temperature during less than 16 ℃, confirm that then the defrost interval time is 30 minutes; When last time defrosting is withdrawed from during fin temperature >=16 of detected heat exchanger ℃, and defrosting last time confirms that then the defrost interval time is 90 minutes when accomplishing required time＜2 minute; When last time defrosting is withdrawed from during fin temperature >=16 of detected heat exchanger ℃, and defrosting last time to accomplish required time be that then definite said defrost interval time was 60 minutes more than or equal to 2 minutes during less than 4 minutes; When last time defrosting is withdrawed from during fin temperature >=16 of detected heat exchanger ℃, and defrosting last time to accomplish required time be that then definite defrost interval time was 50 minutes more than or equal to 4 minutes during less than 6 minutes; When last time defrosting is withdrawed from during fin temperature >=16 of detected heat exchanger ℃, and defrosting last time to accomplish required time be that then definite defrost interval time was 40 minutes more than or equal to 6 minutes during less than 8 minutes; When last time defrosting is withdrawed from during fin temperature >=16 of detected heat exchanger ℃, and defrosting last time confirms that then the defrost interval time is 30 minutes when accomplishing required time >=8 minute.
Preferably, the utility model method is applicable to and decides frequency wind-cooled cold-water source pump.
On the other hand; The utility model also provides a kind of air-conditioning Air-Cooled Heat Pump Unit; The cross valve that its exhaust outlet with evaporimeter, condenser, compressor and control compressor is communicated with evaporimeter or condenser selectively; The gas that promptly makes compressor the discharge evaporimeter condenser of flowing through again of flowing through earlier, the condenser of perhaps flowing through the earlier evaporimeter of flowing through again.Obviously, cross valve has first, second, third, fourth totally four ports, and first port is communicated with the exhaust outlet of compressor, and second port is communicated with the air entry of compressor, and the 3rd port is communicated with evaporimeter, and the 4th port is communicated with condenser.Further, the utility model air-conditioning Air-Cooled Heat Pump Unit also comprises: first temperature sensor is installed on the finned coil of said evaporimeter, in order to gather the fin temperature of evaporimeter; Second temperature sensor is installed in (for example, on fin, be provided with the environment temperature sensor folder, second temperature sensor is installed in this environment temperature sensor folder) on the fin of evaporimeter, to gather outdoor environment temperature; And defrost controller; It receives the temperature signal of first and second temperature sensors transmission and defrosts with the selected defrost interval time according to the temperature signal control unit that is received, and wherein this defrost controller has first signal receiving end that is connected with first temperature sensor, the secondary signal receiving terminal that is connected with second temperature sensor.
As shown in Figure 3; Defrost controller in the utility model comprises: defrost interval determination module, defrost interval judge module, defrosting start judge module, Defrost operation module, defrosting end module; The defrost interval determination module is connected with the defrost interval judge module; The defrost interval judge module starts judge module with defrosting and is connected, and defrosting starts judge module and is connected with the Defrost operation module, and defrosting finishes module and is connected with the Defrost operation module.
The defrost interval determination module: required time is accomplished in the fin temperature of detected evaporimeter and defrosting last time when withdrawing from according to defrosting last time, the defrost interval time between confirming to defrost defrosting last time and next time; This module realizes its function according to above referring to accompanying drawing 2 described flow processs, repeats no more here.The defrost interval judge module: judge that unit withdraws from the running time that picks up counting from defrosting last time and whether satisfies the defrost interval time, the defrost interval time is confirmed by above-mentioned defrost interval determination module.
Defrosting starts judge module: satisfy defrost interval during the time when said running time; Judge whether to meet the defrost defrosting of entry condition and start judge module; Described defrosting entry condition is aforesaid a-d condition; This module realizes its function through aforesaid judgement flow process according to the a-d condition, repeats no more here.Defrost operation module: when meeting the defrosting entry condition, send compressor shutdown signal and cross valve power-off signal and then start compressor and defrost.Defrosting finishes module: when Defrost operation satisfies the defrosting termination condition, send stopping signal and make unit start operation by heating again to compressor.Wherein said defrosting termination condition is one of aforesaid e, f, three conditions of g, and this module judges whether to satisfy one of e, f, three conditions of g and determines whether that defrosting finishes, and repeats no more here through aforesaid.
The described air-conditioning Air-Cooled Heat Pump Unit of the utility model is preferably and decides frequency wind-cooled cold-water source pump.
To sum up; Required time was accomplished in the fin temperature and defrosting last time of evaporimeter when the Defrost method of the utility model withdrawed from according to defrosting last time; Confirm the defrost interval time between defrosting last time and defrosting next time; Therefore can more reasonably control the defrost interval time, thereby the overall performance of air-conditioning Air-Cooled Heat Pump Unit is provided and guarantee high efficiency, the stable operation of unit.
The sensor that the air-conditioning Air-Cooled Heat Pump Unit of the utility model provides defrost controller and detected the sensor of evaporator fin temperature, detection outdoor environment temperature; Wherein defrost controller receives the temperature signal of first and second temperature sensors transmission and defrosts with the selected defrost interval time according to the temperature signal control unit that is received; Therefore the utility model can more reasonably be controlled the defrost interval time, thereby the overall performance of air-conditioning Air-Cooled Heat Pump Unit is provided and guarantees high efficiency, the stable operation of unit.
Related evaporimeter and condenser are all outdoor in the air-conditioning Air-Cooled Heat Pump Unit of the utility model and the Defrost method of air-conditioning Air-Cooled Heat Pump Unit.
Although illustrated and described the embodiment of the utility model; For those of ordinary skill in the art; Be appreciated that under the situation of principle that does not break away from the utility model and spirit and can carry out multiple variation, modification, replacement and modification that the scope of the utility model is accompanying claims and be equal to and limit to these embodiment.
Claims (5)
1. air-conditioning Air-Cooled Heat Pump Unit comprises: evaporimeter, condenser, compressor and control the cross valve that the exhaust outlet of said compressor is communicated with said evaporimeter or condenser selectively,
It is characterized in that, also comprise:
Gather first temperature sensor of the fin temperature of said evaporimeter, be installed on the finned coil of said evaporimeter;
Gather second temperature sensor of outdoor environment temperature, be installed on the fin of said evaporimeter; And
Receive the temperature signal of said first and second temperature sensors transmission and control the defrost controller that said unit defrosted with the selected defrost interval time according to the temperature signal that is received,
Wherein, said defrost controller has first signal receiving end that is connected with said first temperature sensor, the secondary signal receiving terminal that is connected with said second temperature sensor.
2. air-conditioning Air-Cooled Heat Pump Unit according to claim 1 is characterized in that, said defrost controller comprises:
Required time is accomplished in the fin temperature of detected said evaporimeter and said last time of defrosting when withdrawing from according to defrosting last time, the defrost interval determination module of defrost interval time between confirming to defrost defrosting last time and next time;
Judge that said unit withdraws from the defrost interval judge module of whether satisfy running time that picks up counting from the defrosting last time defrost interval time, is connected with said defrost interval determination module;
Satisfy said defrost interval and judge whether to meet the defrost defrosting of entry condition during the time and start judge module when said running time, be connected with said defrost interval judge module; And
When meeting the defrosting entry condition, send compressor shutdown signal and cross valve power-off signal and then start the Defrost operation module that compressor defrosts, be connected with said defrost interval judge module.
3. air-conditioning Air-Cooled Heat Pump Unit according to claim 2 is characterized in that, said defrost controller also comprises:
When Defrost operation satisfies the defrosting termination condition, send stopping signal and make said unit finish module by heating the defrosting that starts operation again to said compressor, said defrosting finishes module and is connected with said Defrost operation module.
4. according to each described air-conditioning Air-Cooled Heat Pump Unit among the claim 1-3, it is characterized in that,
Said cross valve has first, second, third, fourth totally four ports; Wherein, Said first port is communicated with the exhaust outlet of said compressor; Second port is communicated with the air entry of said compressor, and the 3rd port is communicated with said evaporimeter, and the 4th port is communicated with condenser in the said air-conditioning Air-Cooled Heat Pump Unit.
5. according to each described air-conditioning Air-Cooled Heat Pump Unit among the claim 1-3, it is characterized in that said air-conditioning Air-Cooled Heat Pump Unit is fixed wind-cooled cold-water source pump frequently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205406441U CN202420019U (en) | 2011-12-21 | 2011-12-21 | Air conditioning air-cooled heat pump unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205406441U CN202420019U (en) | 2011-12-21 | 2011-12-21 | Air conditioning air-cooled heat pump unit |
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| CN202420019U true CN202420019U (en) | 2012-09-05 |
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| CN2011205406441U Withdrawn - After Issue CN202420019U (en) | 2011-12-21 | 2011-12-21 | Air conditioning air-cooled heat pump unit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519186A (en) * | 2011-12-21 | 2012-06-27 | 青岛海尔空调电子有限公司 | Defrosting method of air conditioner air-cooled heat pump unit and air conditioner air-cooled heat pump unit |
| CN106091466A (en) * | 2016-07-29 | 2016-11-09 | 北京华誉能源技术股份有限公司 | A kind of have the air-cooled heat pump unit that defrosting controls |
| CN106766435A (en) * | 2015-11-20 | 2017-05-31 | 青岛海尔新能源电器有限公司 | A kind of suction temperature controls the control method and water heater of air source heat pump defrosting |
| CN108895734A (en) * | 2018-07-25 | 2018-11-27 | 珠海格力电器股份有限公司 | A kind of Teat pump boiler defrost judgment method |
| CN109028639A (en) * | 2018-07-03 | 2018-12-18 | 浙江国祥股份有限公司 | A kind of defrosting control method and air source heat pump of air source heat pump |
| CN113776319A (en) * | 2021-08-31 | 2021-12-10 | 常州恒创热管理有限公司 | Drying machine |
| CN114251785A (en) * | 2021-12-22 | 2022-03-29 | 珠海格力电器股份有限公司 | Defrosting control method, device, equipment, storage medium and related equipment |
-
2011
- 2011-12-21 CN CN2011205406441U patent/CN202420019U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519186A (en) * | 2011-12-21 | 2012-06-27 | 青岛海尔空调电子有限公司 | Defrosting method of air conditioner air-cooled heat pump unit and air conditioner air-cooled heat pump unit |
| CN106766435A (en) * | 2015-11-20 | 2017-05-31 | 青岛海尔新能源电器有限公司 | A kind of suction temperature controls the control method and water heater of air source heat pump defrosting |
| CN106091466A (en) * | 2016-07-29 | 2016-11-09 | 北京华誉能源技术股份有限公司 | A kind of have the air-cooled heat pump unit that defrosting controls |
| CN109028639A (en) * | 2018-07-03 | 2018-12-18 | 浙江国祥股份有限公司 | A kind of defrosting control method and air source heat pump of air source heat pump |
| CN109028639B (en) * | 2018-07-03 | 2019-10-22 | 浙江国祥股份有限公司 | A kind of defrosting control method and air source heat pump of air source heat pump |
| CN108895734A (en) * | 2018-07-25 | 2018-11-27 | 珠海格力电器股份有限公司 | A kind of Teat pump boiler defrost judgment method |
| CN113776319A (en) * | 2021-08-31 | 2021-12-10 | 常州恒创热管理有限公司 | Drying machine |
| CN114251785A (en) * | 2021-12-22 | 2022-03-29 | 珠海格力电器股份有限公司 | Defrosting control method, device, equipment, storage medium and related equipment |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20120905 Effective date of abandoning: 20140806 |
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| RGAV | Abandon patent right to avoid regrant |