CN202470308U - Synchronous control device for compressor and expansion valve of thermostatic and humidistatic air conditioning unit - Google Patents
Synchronous control device for compressor and expansion valve of thermostatic and humidistatic air conditioning unit Download PDFInfo
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- CN202470308U CN202470308U CN2012200945125U CN201220094512U CN202470308U CN 202470308 U CN202470308 U CN 202470308U CN 2012200945125 U CN2012200945125 U CN 2012200945125U CN 201220094512 U CN201220094512 U CN 201220094512U CN 202470308 U CN202470308 U CN 202470308U
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Abstract
The utility model relates to a synchronous control device for a compressor and an expansion valve of a thermostatic and humidistatic air conditioning unit, which comprises an inverter compressor, an outdoor condenser, an electronic expansion valve, an indoor evaporator, an electric heater and an electrode humidifier, wherein a frequency control input end of the inverter compressor is respectively connected with output ends of outdoor temperature Tw, outdoor temperature change rate Tw', indoor temperature Tn, indoor temperature change rate Tn', indoor humidity phi n, indoor humidity change rante phi n', superheating temperature delta Tsh and superheating temperature change rate delta Tsh' monitors; an opening control input end of the electronic expansion valve is respectively connected with output ends of indoor temperature Tn, indoor temperature change rate Tn', indoor humidity phi n, indoor humidity change rate phi n', superheating temperature delta Tsh and superheating temperature change rate delta Tsh' monitors and a frequency signal output end of the compressor; and the operation control is implemented according to input indoor/outdoor temperature and humidity changes and change rates as well as superheating temperature and superheating temperature change rate, self-adapting PID adjustment is implemented, the frequency signal of the compressor and the opening signal of the expansion valve are output, and the rotation speed of the compressor and the opening pulse value of the expansion valve are controlled, thereby implementing synchronous control.
Description
Technical field
The utility model belongs to the air conditioner controlling technology field, and the especially a kind of compressor of thermostatic and humidistatic air conditioning unit and the sync control device of expansion valve can be realized thermostatic and humidistatic air conditioning unit humiture High Accuracy Control.
Background technology
Present stage; Thermostatic and humidistatic air conditioning unit is mainly realized through dual mode for the accurate control that controls environment: the one, through regulating the accurately control required refrigerating capacity (moisture removal) of exerting oneself of compressor; Reach constant humiture high-precision requirement, this often needs the adjustable compressors of capacity such as frequency conversion or digital vortex; The 2nd, utilize controllable silicon PID to regulate and add heat and humidification amount, thereby accurately regulated refrigerating capacity and crossed moisture removal, reach the adjusting purpose of constant temperature and humidity.Under the overall situation of energy-saving and emission-reduction, the drawback that the latter costs an arm and a leg because of controllable silicon and can't solve cold and hot amount counteracting and energy waste, thereby be unfavorable for generally promoting; And preceding kind of method can effectively be alleviated the cold and hot amount counteracting that asynchronism caused because of Temperature and Humidity Control, and the adjustable characteristics of compressor capacity can accurately be controlled indoor temperature and humidity simultaneously, and this also is the developing direction of high-accuracy and constant constant temperature and humidity air conditioner energy-saving technology.
In frequency conversion or the control of digital vortex constant temperature and humidity air-conditioning system; Present control mode is considered the control of electric expansion valve and compressor often isolatedly; Be easy to produce hysteresis or over control, it is collaborative often to make compressor and electric expansion valve can not reach coupling at short notice, though long-time system can tend towards stability; But air conditioner surroundings changeable often, complicated; In case change, need the long period that system is tended towards stability again, certainly will be difficult to like this guarantee that whole refrigeration system operates in optimum state all the time.
Summary of the invention
The utility model; Be intended to alleviate delay and the over control that thermostatic and humidistatic air conditioning unit occurs when carrying out the Temperature and Humidity Control operation; Improve control accuracy, reliability and the energy saving of thermostatic and humidistatic air conditioning unit; Propose a kind of compressor of thermostatic and humidistatic air conditioning unit and the sync control device of expansion valve, can realize thermostatic and humidistatic air conditioning unit humiture High Accuracy Control.
The utility model; Comprise frequency-changeable compressor, outdoor condenser, electric expansion valve, indoor evaporator, electric heater and electrode humidifier, cold-producing medium is through frequency-changeable compressor, after the cold-producing medium inlet chamber external condenser heat release of the HTHP that is come out by frequency-changeable compressor; Throttling is depressurized in the indoor evaporator through electric expansion valve; The cold-producing medium of low-temp low-pressure returns frequency-changeable compressor after the indoor evaporator heat absorption, and then realizes the refrigeration system circulation; The return air of controlled high ambient temperature high humidity is behind the evaporimeter cool-down dehumidification; Behind electric heater and electrode humidifier fine setting heating and humidification, send into controlled environment, to keep the humiture requirement of environment; And then realize the supply air system circulation, the FREQUENCY CONTROL input of frequency-changeable compressor respectively with outdoor temperature
T w , the outdoor temperature rate of change
T w ', indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh The output of monitor connect; The aperture control input end of electric expansion valve respectively with indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh The frequency signal output of output and compressor of monitor connect; The rotating speed control input end of outdoor condenser fan respectively with outdoor temperature
T w , the outdoor temperature rate of change
T w 'The frequency signal output of output and compressor of monitor connect; The rotating speed control input end of indoor evaporator breeze fan respectively with indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n 'The frequency signal output of output and compressor of monitor connect; Electric heater add the heat control input end respectively with indoor temperature
T n With the indoor temperature change generated in case rate
T n 'The output of monitor connect; The humidification amount control input end of electrode humidifier respectively with indoor humidity
φ n With the indoor humidity rate of change
φ n 'The output of monitor connect.
The utility model; It moves control is to start and normally moving under the two states according to thermostatic and humidistatic air conditioning unit; Be divided into coarse adjustment control stage and fine tuning control stage to system's control, the Different control stage is adopted the Different control method, in the coarse adjustment stage; The subject matter that solves is the difference of dwindling as early as possible between indoor temperature, humidity and the target setting; In the coarse adjustment stage, system is in a unsettled running, accurately controls degree of superheat difficulty relatively often; Control method in the coarse adjustment stage adopts given in advance adjusted open loop: compressor is with speed rising operation under highest frequency of 3Hz/s, and the aperture of electric expansion valve is set at 50%-70%; In the fine tuning stage, room temperature humidity and target setting difference are less, and the main target of control is that the degree of superheat of as far as possible keeping cold-producing medium fluctuates in more among a small circle; And as far as possible near the target setting value, remain best liquid supply rate, improve the operational efficiency of system to keep indoor heat exchanger; At this moment; Should consider to strengthen control by emphasis, take into account indoor temperature, humidity, in order to avoid it is excessive to depart from objectives to the degree of superheat of cold-producing medium.Adopt the synchronous closed-loop adjustment of compressor-expansion valve in the fine tuning stage: according to the input outdoor temperature
T w , the outdoor temperature rate of change
T w ', indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', regulate through self-adaptive PID, and the frequency signal f of output compressor, the rotating speed of control compressor; According to the input indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', and the frequency signal f of compressor, regulate through self-adaptive PID, and the aperture signal h of output expansion valve, the pulse value that the control expansion valve is opened; According to outdoor environment temperature
T w , rate of temperature change
T w ',And the frequency signal f of compressor, the rotating speed of control condensation fan; According to indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n With the indoor humidity rate of change
φ n ',And the frequency signal f of compressor, the rotating speed of control indoor evaporator breeze fan; Electric heater is by the temperature of controlled environment
T n With the variation of temperature rate
T n 'Control the heat that adds that drops into; Humidifier is by the relative humidity of controlled environment
φ n Rate of change with relative humidity
φ n 'The humidification amount that control drops into.
The utility model has following characteristics:
1, adopt stage by stage control mode, can shorten greatly the thermostatic and humidistatic air conditioning unit group the startup stage or receive external interference and time of causing controlled ambient temperature and humidity fluctuation;
2, adopt compressor-expansion valve Synchronization Control scheme, alleviated because compressor and expansion valve are independently controlled delay and the over control that causes in system's control separately;
3, combine traditional Adaptive PID Control method; Form compressor-expansion valve synchronous self-adapting pid control mode stage by stage, can be implemented in environment temperature is 7 ℃～30 ℃, relative humidity 40%～75%; Temperature control precision can reach ± and 0.2 ℃, the relative humidity control accuracy can reach ± 3%RH.
Description of drawings
Fig. 1 is the structural principle block diagram of embodiment; Fig. 2 compressor frequency and indoor temperature are with the variation relation of running time; Fig. 3 compressor frequency and indoor relative humidity are with the variation relation of running time; The aperture of Fig. 4 compressor frequency, expansion valve and the degree of superheat are with the variation relation of running time.
Among the figure,
T w , T w ', T n , T n ', φ n , φ n ’ 、 ⊿ T Sh 、 ⊿ T Sh ',
fWith
hExpression is the frequency of outdoor temperature, outdoor temperature rate of change, indoor temperature, indoor temperature change generated in case rate, indoor relative humidity, indoor relative humidity rate of change, the degree of superheat, degree of superheat rate of change, compressor and the aperture of expansion valve respectively.
The specific embodiment
With reference to Fig. 1; A kind of compressor of thermostatic and humidistatic air conditioning unit and expansion valve sync control device; Comprise frequency-changeable compressor, outdoor condenser, electric expansion valve, indoor evaporator, electric heater and electrode humidifier, cold-producing medium is through frequency-changeable compressor, after the cold-producing medium inlet chamber external condenser heat release of the HTHP that is come out by frequency-changeable compressor; Throttling is depressurized in the indoor evaporator through electric expansion valve; The cold-producing medium of low-temp low-pressure returns frequency-changeable compressor after the indoor evaporator heat absorption, and then realizes the refrigeration system circulation; The return air of controlled high ambient temperature high humidity through behind electric heater and electrode humidifier fine setting heating and the humidification, is sent into controlled environment behind the evaporimeter cool-down dehumidification, keeping the humiture requirement of environment, and then the realization supply air system circulates.Wherein: the FREQUENCY CONTROL input of frequency-changeable compressor respectively with outdoor temperature
T w , the outdoor temperature rate of change
T w ', indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh The output of monitor connect; The aperture control input end of electric expansion valve respectively with indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh The frequency signal output of output and compressor of monitor connect; The rotating speed control input end of outdoor condenser fan respectively with outdoor temperature
T w , the outdoor temperature rate of change
T w 'The frequency signal output of output and compressor of monitor connect; The rotating speed control input end of indoor evaporator breeze fan respectively with indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n 'The frequency signal output of output and compressor of monitor connect; Electric heater add the heat control input end respectively with indoor temperature
T n With the indoor temperature change generated in case rate
T n 'The output of monitor connect; The humidification amount control input end of electrode humidifier respectively with indoor humidity
φ n With the indoor humidity rate of change
φ n 'The output of monitor connect.
When system started operation, the subject matter that solve was the difference of dwindling as early as possible between indoor temperature, humidity and the target setting.At this moment, system is in a unsettled running, accurately controls degree of superheat difficulty relatively often.Therefore, do not introduce the degree of superheat for its input parameter of control of frequency-changeable compressor, correspond to electric expansion valve and also do not introduce the degree of superheat, the adjusting rule is given in advance.Compressor can 3Hz/s speed raise until highest frequency operation down, the aperture of electric expansion valve is set at 50%-70%, the system that so both can guarantee also avoids the aperture of expansion valve to cause system low-voltage excessively slowly rapidly to controlled environment temperature reduction dehumidifying.Meanwhile, when controlled environment temperature and desired value differ 2 ℃, finish the startup stage of thinking system.Outdoor environment temperature
T w And rate of temperature change
T w 'The rotating speed of control condensation fan, heater is by the temperature of controlled environment
T n With the variation of temperature rate
T n 'Control the heat that adds that drops into, humidifier is by the relative humidity of controlled environment
φ n Rate of change with relative humidity
φ n 'The humidification amount that control drops into.For confirming of sampling time, should emphasis consider the characteristic of indoor temperature and humidity, need take into account the variation characteristic of refrigerant superheat degree simultaneously, the sampling period can suitably extend.
In system's normal course of operation; Room temperature humidity and target setting difference are less, and the main target of control is that the degree of superheat of as far as possible keeping cold-producing medium fluctuates in more among a small circle, and as far as possible near the target setting value; To keep indoor heat exchanger to remain best liquid supply rate, improve the operational efficiency of system.At this moment, should consider to strengthen control by emphasis, take into account indoor temperature, humidity, in order to avoid it is excessive to depart from objectives to the degree of superheat of cold-producing medium.When the difference of the temperature of controlled environment and setting value was within 2 ℃, system got into the fine tuning stage, according to the input outdoor temperature
T w , the outdoor temperature rate of change
T w ', indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', regulate through self-adaptive PID, and the frequency signal f of output compressor, the rotating speed of control compressor; According to the input indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', and the frequency signal f of compressor, regulate through self-adaptive PID, and the aperture signal h of output expansion valve, the pulse value that the control expansion valve is opened; According to outdoor environment temperature
T w , rate of temperature change
T w ',And the frequency signal f of compressor, the rotating speed of control condensation fan; According to indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n With the indoor humidity rate of change
φ n ',And the frequency signal f of compressor, the rotating speed of control indoor evaporator breeze fan; Electric heater is by the temperature of controlled environment
T n With the variation of temperature rate
T n 'Control the heat that adds that drops into; Humidifier is by the relative humidity of controlled environment
φ n Rate of change with relative humidity
φ n 'The humidification amount that control drops into.
For confirming of sampling time, should strengthen control by emphasis to the degree of superheat, need take into account the variation of indoor temperature and humidity simultaneously.Because the degree of superheat is relatively more responsive to the variation of operating mode, so desirable weak point of sampling period a bit.
Compressor-expansion valve Synchronization Control theory combines with traditional Adaptive PID Control theory stage by stage; Be built into compressor-expansion valve synchronous self-adapting pid control mode stage by stage; Through control software platform able to programme; On high accuracy frequency conversion thermostatic and humidistatic air conditioning unit, implement, and carry out humiture precision control experiment test.Fig. 2～4 have provided outdoor environment temperature respectively and have been controlled at 35 ℃; Indoor environment temperature is controlled at 22 ℃; Relative humidity is controlled at 55%; Have hot humidity load and disturb down (among the figure, providing hot humidity load to disturb at 10:20), the operating frequency of indoor temperature, relative humidity, compressor, the aperture of electric expansion valve and the degree of superheat are with the situation of change of running time.Experimental result shows that the aperture of the humiture of controlled environment, the operating frequency of compressor, electric expansion valve is keeping consistent step basically in the whole service process, have delay phenomenon hardly.Temperature control precision can reach ± and 0.2 ℃, the relative humidity control accuracy can reach ± 3%RH, and the degree of superheat of system is in whole experiment, and it is less to fluctuate.The delay phenomenon of resolution system control well.
Claims (1)
1. the compressor of a thermostatic and humidistatic air conditioning unit and expansion valve sync control device; Comprise frequency-changeable compressor, outdoor condenser, electric expansion valve, indoor evaporator, electric heater and electrode humidifier; Cold-producing medium is through frequency-changeable compressor; After the cold-producing medium inlet chamber external condenser heat release of the HTHP that is come out by frequency-changeable compressor, throttling is depressurized in the indoor evaporator through electric expansion valve, and the cold-producing medium of low-temp low-pressure is after the indoor evaporator heat absorption; Return frequency-changeable compressor, and then realize the refrigeration system circulation; The return air of controlled high ambient temperature high humidity is behind the evaporimeter cool-down dehumidification; Behind electric heater and electrode humidifier fine setting heating and humidification; Send into controlled environment; Keeping the humiture requirement of environment, and then realize the supply air system circulation, it is characterized in that: the FREQUENCY CONTROL input of frequency-changeable compressor respectively with outdoor temperature
T w , the outdoor temperature rate of change
T w ', indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh The output of monitor connect; The aperture control input end of electric expansion valve respectively with indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh The frequency signal output of output and compressor of monitor connect; The rotating speed control input end of outdoor condenser fan respectively with outdoor temperature
T w , the outdoor temperature rate of change
T w 'The frequency signal output of output and compressor of monitor connect; The rotating speed control input end of indoor evaporator breeze fan respectively with indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n 'The frequency signal output of output and compressor of monitor connect; Electric heater add the heat control input end respectively with indoor temperature
T n With the indoor temperature change generated in case rate
T n 'The output of monitor connect; The humidification amount control input end of electrode humidifier respectively with indoor humidity
φ n With the indoor humidity rate of change
φ n 'The output of monitor connect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200945125U CN202470308U (en) | 2012-03-13 | 2012-03-13 | Synchronous control device for compressor and expansion valve of thermostatic and humidistatic air conditioning unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200945125U CN202470308U (en) | 2012-03-13 | 2012-03-13 | Synchronous control device for compressor and expansion valve of thermostatic and humidistatic air conditioning unit |
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| CN202470308U true CN202470308U (en) | 2012-10-03 |
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| CN2012200945125U Expired - Lifetime CN202470308U (en) | 2012-03-13 | 2012-03-13 | Synchronous control device for compressor and expansion valve of thermostatic and humidistatic air conditioning unit |
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Cited By (12)
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| CN103743063A (en) * | 2014-01-17 | 2014-04-23 | 苏州海特温控技术有限公司 | Method of controlling electronic expansion valve during refrigeration of air conditioner |
| CN104864546A (en) * | 2014-02-26 | 2015-08-26 | 珠海格力电器股份有限公司 | Control method of combined air-conditioning unit, controller and air-conditioning unit |
| CN106247479A (en) * | 2016-10-09 | 2016-12-21 | 江苏心日源建筑节能科技股份有限公司 | Air-conditioner outdoor unit and there is its air-conditioning |
| CN108954728A (en) * | 2018-07-09 | 2018-12-07 | 苏州韵之秋智能科技有限公司 | A kind of intelligent frequency-conversion energy-saving control method for central air conditioner |
| CN108954727A (en) * | 2018-07-09 | 2018-12-07 | 苏州韵之秋智能科技有限公司 | A kind of intelligent frequency-conversion central air-conditioning |
| CN105650812B (en) * | 2016-01-04 | 2019-06-28 | 广东美的暖通设备有限公司 | Air-conditioning indoor fan control method and air-conditioning |
| CN109991843A (en) * | 2019-04-30 | 2019-07-09 | 广州齐志生物工程设备有限公司 | A kind of temprature control method of bioreactor |
| CN111878964A (en) * | 2020-07-27 | 2020-11-03 | 宁波奥克斯电气股份有限公司 | Control method and device of electronic expansion valve, air conditioner and storage medium |
| CN112484348A (en) * | 2020-11-12 | 2021-03-12 | 珠海格力电器股份有限公司 | Control method and device of electronic expansion valve and electrical equipment |
| CN113834201A (en) * | 2021-09-06 | 2021-12-24 | 美的集团武汉暖通设备有限公司 | Air conditioner control method, air conditioner and storage medium |
| CN114484805A (en) * | 2022-02-25 | 2022-05-13 | 珠海格力电器股份有限公司 | Air conditioner temperature and humidity control method and air conditioner |
| CN115406044A (en) * | 2022-05-24 | 2022-11-29 | 珠海格力电器股份有限公司 | Constant-temperature dehumidification control method and device for air conditioner, computer equipment and air conditioner |
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2012
- 2012-03-13 CN CN2012200945125U patent/CN202470308U/en not_active Expired - Lifetime
Cited By (15)
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| CN103743063B (en) * | 2014-01-17 | 2016-06-22 | 苏州海特温控技术有限公司 | The control method of electric expansion valve during a kind of air conditioner refrigerating |
| CN103743063A (en) * | 2014-01-17 | 2014-04-23 | 苏州海特温控技术有限公司 | Method of controlling electronic expansion valve during refrigeration of air conditioner |
| CN104864546A (en) * | 2014-02-26 | 2015-08-26 | 珠海格力电器股份有限公司 | Control method of combined air-conditioning unit, controller and air-conditioning unit |
| CN105650812B (en) * | 2016-01-04 | 2019-06-28 | 广东美的暖通设备有限公司 | Air-conditioning indoor fan control method and air-conditioning |
| CN106247479A (en) * | 2016-10-09 | 2016-12-21 | 江苏心日源建筑节能科技股份有限公司 | Air-conditioner outdoor unit and there is its air-conditioning |
| CN108954727A (en) * | 2018-07-09 | 2018-12-07 | 苏州韵之秋智能科技有限公司 | A kind of intelligent frequency-conversion central air-conditioning |
| CN108954728A (en) * | 2018-07-09 | 2018-12-07 | 苏州韵之秋智能科技有限公司 | A kind of intelligent frequency-conversion energy-saving control method for central air conditioner |
| CN109991843A (en) * | 2019-04-30 | 2019-07-09 | 广州齐志生物工程设备有限公司 | A kind of temprature control method of bioreactor |
| CN109991843B (en) * | 2019-04-30 | 2021-11-23 | 广州齐志生物工程设备有限公司 | Temperature control method of bioreactor |
| CN111878964A (en) * | 2020-07-27 | 2020-11-03 | 宁波奥克斯电气股份有限公司 | Control method and device of electronic expansion valve, air conditioner and storage medium |
| CN112484348A (en) * | 2020-11-12 | 2021-03-12 | 珠海格力电器股份有限公司 | Control method and device of electronic expansion valve and electrical equipment |
| CN113834201A (en) * | 2021-09-06 | 2021-12-24 | 美的集团武汉暖通设备有限公司 | Air conditioner control method, air conditioner and storage medium |
| CN113834201B (en) * | 2021-09-06 | 2022-12-02 | 美的集团武汉暖通设备有限公司 | Air conditioner control method, air conditioner and storage medium |
| CN114484805A (en) * | 2022-02-25 | 2022-05-13 | 珠海格力电器股份有限公司 | Air conditioner temperature and humidity control method and air conditioner |
| CN115406044A (en) * | 2022-05-24 | 2022-11-29 | 珠海格力电器股份有限公司 | Constant-temperature dehumidification control method and device for air conditioner, computer equipment and air conditioner |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |