CN105605747A - Automatic control device of cooling air quantity of outdoor condenser - Google Patents
Automatic control device of cooling air quantity of outdoor condenser Download PDFInfo
- Publication number
- CN105605747A CN105605747A CN201610134555.4A CN201610134555A CN105605747A CN 105605747 A CN105605747 A CN 105605747A CN 201610134555 A CN201610134555 A CN 201610134555A CN 105605747 A CN105605747 A CN 105605747A
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- Prior art keywords
- condensing pressure
- air valve
- electric air
- signal
- telecommunication
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of cooling air quantity control of refrigerating equipment and relates to an automatic control device of cooling air quantity of an outdoor condenser. The automatic control device is mainly structurally characterized in that a condensing pressure sensor is fixedly mounted on a condenser liquid-collecting mother tube through a condensing pressure capillary, the condensing pressure sensor is respectively connected with a fan frequency converter and an electric air valve controller, the fan frequency converter is respectively connected with two variable-frequency fan lines, the electric air valve controller is connected with an electric air valve electric actuator line, an electric air valve electric actuator is mechanically connected with an electric air valve plate, the fan frequency converter and the electric air valve controller are respectively connected to a power frequency power supply line, and the power frequency power supply line is connected with an external power supply source. A control process includes converting an electric signal, controlling the exhaust quantity of a variable-frequency fan and controlling electric air valve air inlet quantity. The automatic control device is capable of linearly controlling condenser air inlet quantity, scientific in control principle, simple in structure, high in control precision, low in energy consumption, long in service life and good in application environment.
Description
Technical field:
The cooling air quantity control technology field that the invention belongs to refrigeration plant, relates to a kind of outdoor condensationThe automaton of device cooling air quantity, particularly a kind of under outdoor utmost point low temperature environment according to condensationThe device that pressure size is controlled outdoor condenser cooling air quantity.
Background technology:
At present, the outdoor condenser of the refrigeration plant such as industrial air-conditioning unit and freezer unit is generallyWith the fin-tube heat exchanger of blower fan, it is taken away heat by rising ventilating air temperature and reducesCondensation temperature. This heat exchange mode is in outdoor environment temperature lower season, and heat exchange efficiency is higher,But in the time that outdoor environment temperature is extremely low, affects on the contrary operation and produce because low-voltage variation appears in unit,The industrial air-conditioning unit to outdoor environment heat extraction of for example whole year operation and freezer unit work in the winter timeUnder condition, particularly in the time that outdoor environment temperature is processed the dew-point temperature of air lower than unit, due toOutdoor inlet air temperature of condenser is too low, and condensation temperature is reduced gradually, thus make condensing pressure withReduce, and condensing pressure reduce to cause evaporating pressure decline, unit refrigeration performance worsen,Until unit self carries out low-voltage variation and shuts down, result not only affects unit ventilation temperature and wetThe stability of degree, and then affect air conditioner surroundings and plant produced in factory building, if things go on like this, air-conditioningThe service life of unit is also influenced.
For avoiding unit to occur in the winter time low voltage failure, in prior art, it normally gives outdoorCondenser parcel canvas suitably reduces intake volume, or increases by installing pressure controller additionalOr the cooling blower quantity of minimizing work, these two kinds of improved devices can prevent to a certain extentLow voltage failure, but in the time that outside air temperature changes, the method for parcel canvas needs manually to adjustWrapped air-admitting surface, reaches the object that changes cooling air quantity, because can not automatically regulatingIncreased personnel's workload, degree of regulation is difficult to ensure simultaneously, and still power frequency operation of blower fan,A large amount of electric energy are wasted; Install the device that pressure controller increases and decreases blower fan number additional, open at blower fanThe fluctuation that easily causes condensing pressure in moving and stopped process, has affected the stable of evaporating temperature,And frequent start-stop easily causes service life of fan to shorten, be unfavorable for the long-term stability operation of unit.Therefore, seek to design a kind of control device of outdoor condenser cooling air quantity, will in condenser, pressPower is converted to the signal of telecommunication, by ratio aperture and the intake of signal of telecommunication control Electric air valve valve block,By operating frequency and the rotating speed of signal of telecommunication control frequency conversion fan, reach the object of controlling exhaust air rate,Meet low air quantity operating mode and energy-conservation requirement, this technical scheme there is not yet report so far.
Summary of the invention:
The object of the invention is to overcome the shortcoming that prior art exists, propose design a kind of outdoorThe automaton of condenser cooling air quantity, to solve manual adjustment air-admitting surface workloadGreatly, low precision and the large problem of power consumption, solve and adopt pressure controller increase and decrease working fan quantityThe condensing pressure fluctuation, the evaporating temperature that in process, cause are unstable and service life of fan shorteningProblem.
In order to realize foregoing invention object, the outdoor condenser cooling air quantity the present invention relates to fromDynamic control device, its agent structure comprises: condensing pressure sensor, fan frequency converter, frequency conversionBlower fan, Electric air valve YE, Electric air valve valve block, Electric air valve controller, condensationThe female pipe of device liquid collecting, Electric air valve controller power stage line, power frequency supply lines, casing of outdoor,Condensing pressure capillary, condensing pressure holding wire and transducer power output line; Condensing pressure passesIt is upper that sensor is fixed on the female pipe of condenser liquid collecting by condensing pressure capillary, condensing pressure hairThe female pipe of tubule and condenser liquid collecting is connected; One end of condensing pressure holding wire is connected on condensing pressureThe output of sensor, the other end is connected on respectively on fan frequency converter and Electric air valve controller;Between fan frequency converter and two frequency conversion fans, join by two transducer power output line lines respectivelyConnect, Electric air valve valve block is arranged on the air inlet place of casing of outdoor, and Electric air valve controller is logicalCross Electric air valve controller power stage line and be connected on Electric air valve YE, electronic windMechanical linkage, fan frequency converter and Electric air valve between valve YE and Electric air valve valve blockController is connected to respectively on power frequency supply lines, and power frequency supply lines connects the power supply of peripheral hardware,Constitute intake control device.
The control procedure of the outdoor condenser cooling air quantity automaton the present invention relates to comprisesSignal of telecommunication conversion, control frequency conversion fan exhaust air rate and control Electric air valve intake three parts, toolBody control procedure is:
(1) signal of telecommunication conversion: the female pipe internal condensation of condenser liquid collecting pressure is by condensing pressure capillaryPipe is passed to condensing pressure sensor, and it is large that condensing pressure is converted to voltage by condensing pressure sensorBe greater than in being less than V or electric current the signal of telecommunication that mA is less than mA, the signal of telecommunication of condensing pressure sensor along withThe raising of condensing pressure and increasing, the signal of telecommunication of condensing pressure sensor is along with condensing pressure fallsLow and reduce, realize the ratio conversion of condensing pressure signal and the signal of telecommunication;
(2) control frequency conversion fan exhaust air rate: condensing pressure sensor is by the electricity of step (1) conversionSignal flows to fan frequency converter by condensing pressure holding wire, and the blower fan that power supply drives becomesFrequently device passes through respectively two changes according to the signal of telecommunication of step (1) conversion by the electric energy after frequency-conversion processingFrequently device power stage line is transferred on two frequency conversion fans, then controls the work of frequency conversion fan frequentlyRate and rotating speed increase along with the increase of step (1) switching electrical signals, control the work of frequency conversion fanWorking frequency and rotating speed reduce along with step (1) reducing of switching electrical signals, and then realize linearControl the exhaust air rate of frequency conversion fan;
(3) control Electric air valve intake: condensing pressure sensor is by the electricity of step (1) conversionSignal flows to Electric air valve controller by condensing pressure holding wire, the electricity that power supply drivesMoving wind valve controller according to the signal of telecommunication of step (1) conversion by power frequency electric energy by Electric air valve controlDevice power stage line processed is sent to Electric air valve YE, thereby it is electronic to control Electric air valveThe rotating of actuator and action ratio, and then control and be arranged on casing of outdoor air inlet placeThe aperture of Electric air valve valve block increases electronic wind along with the increase of step (1) switching electrical signalsThe aperture of valve valve block reduces along with step (1) reducing of switching electrical signals, realizes Electric air valveThe Linear Control of intake.
The present invention compared with prior art, can auto linear control condenser intake, its controlPrinciple science, simple process, control accuracy is high, saves manpower, and energy consumption is low, failure rate is low,Life-span is long; Its control appliance is simple in structure, controls reliably, and wide accommodation, friend controls environmentGood.
Brief description of the drawings:
Fig. 1 is the Facad structure principle schematic of air-conditioner outdoor unit of the present invention.
Fig. 2 is the structure principle schematic of air-conditioner outdoor unit of the present invention.
Fig. 3 is automatic control flow chart structural principle schematic diagram of the present invention.
Detailed description of the invention:
Below by specific embodiment, also the invention will be further described by reference to the accompanying drawings.
Embodiment:
The automaton of the outdoor condenser cooling air quantity that the present embodiment relates to, its body junctionStructure comprises: condensing pressure sensor 1, fan frequency converter 2, frequency conversion fan 3, Electric air valve are electronicActuator 4, Electric air valve valve block 5, Electric air valve controller 6, the female pipe 7 of condenser liquid collecting, electricityMoving wind valve controller power stage line 8, power frequency supply lines 9, casing of outdoor 10, condensing pressureCapillary 11, condensing pressure holding wire 12 and transducer power output line 13; Condensing pressure sensingDevice 1 is fixed on the female pipe 7 of condenser liquid collecting by condensing pressure capillary 11, condensing pressureCapillary 11 is connected with the female pipe 7 of condenser liquid collecting; One end of condensing pressure holding wire 12 is connected on coldThe output of solidifying pressure sensor 1, the other end is connected on respectively fan frequency converter 2 and Electric air valve controlOn device 6 processed; Between fan frequency converter 2 and two frequency conversion fans 3, pass through respectively two transducer powersOutput line 13 lines connect, and Electric air valve valve block 5 is arranged on the air inlet place of casing of outdoor 10, electricityIt is electronic that moving wind valve controller 6 is connected to Electric air valve by Electric air valve controller power stage line 8On actuator 4, mechanical linkage between Electric air valve YE 4 and Electric air valve valve block 5, windMachine frequency converter 2 and Electric air valve controller 6 are connected to respectively on power frequency supply lines 9, power frequency supply lines9 connect the power supply of peripheral hardware, constitute intake control device.
The control procedure of the outdoor condenser cooling air quantity control device that the present embodiment relates to comprises electricitySignal conversion, control frequency conversion fan exhaust air rate and control Electric air valve intake three parts are concreteControl procedure is:
(1) signal of telecommunication conversion: the female pipe of condenser liquid collecting 7 internal condensation pressure are by condensing pressure capillaryPipe 11 is passed to condensing pressure sensor 1, and condensing pressure is converted to electricity by condensing pressure sensor 1Pressure is greater than 0 and is less than 10V or electric current is greater than the signal of telecommunication that 4mA is less than 20mA, condensing pressure sensor 1The signal of telecommunication increase along with the raising of condensing pressure, the signal of telecommunication of condensing pressure sensor 1 along withThe reduction of condensing pressure and reducing, realizes the ratio conversion of condensing pressure signal and the signal of telecommunication;
(2) control frequency conversion fan exhaust air rate: condensing pressure sensor 1 is changed step (1)The signal of telecommunication flows to fan frequency converter 2 by condensing pressure holding wire 12, the wind that power supply drivesMachine frequency converter 2 passes through the electric energy after frequency-conversion processing respectively according to the signal of telecommunication of step (1) conversionTwo transducer power output lines 13 are transferred on two frequency conversion fans 3, then control frequency conversion fan3 operating frequency and rotating speed increase along with the increase of step (1) switching electrical signals, control and becomeFrequently operating frequency and the rotating speed of blower fan 3 reduce along with step (1) reducing of switching electrical signals,And then realize the exhaust air rate of Linear Control frequency conversion fan 3;
(3) control Electric air valve intake: condensing pressure sensor 1 is changed step (1)The signal of telecommunication flows to Electric air valve controller 6 by condensing pressure holding wire 12, and power supply drivesElectric air valve controller 6 according to the signal of telecommunication of step (1) conversion by power frequency electric energy by electronicWind valve controller power stage line 8 is sent to Electric air valve YE 4, thereby controls electronicThe rotating of air-valve YE 4 and action ratio, and then control is arranged on casing of outdoor 10The aperture of the Electric air valve valve block 5 at air inlet place is along with the increase of step (1) switching electrical signalsIncrease, the aperture of Electric air valve valve block 5 reduces along with step (1) reducing of switching electrical signals,Realizing the linearity of Electric air valve intake controls automatically.
Claims (2)
1. an automaton for outdoor condenser cooling air quantity, is characterized in that body junctionStructure comprises: condensing pressure sensor, fan frequency converter, frequency conversion fan, Electric air valve is electronic holdsRow device, Electric air valve valve block, Electric air valve controller, the female pipe of condenser liquid collecting, Electric air valveController power stage line, power frequency supply lines, casing of outdoor, condensing pressure capillary, coldSolidifying pressure signal line and transducer power output line; Condensing pressure sensor is by condensing pressure hairIt is upper that tubule is fixed on the female pipe of condenser liquid collecting, condensing pressure capillary and condenser liquid collecting motherPipe is connected; One end of condensing pressure holding wire is connected on the output of condensing pressure sensor, anotherOne end is connected on respectively on fan frequency converter and Electric air valve controller; Fan frequency converter and two changesFrequently between blower fan, connect respectively Electric air valve valve block peace by two transducer power output line linesBe contained in the air inlet place of casing of outdoor, Electric air valve controller is by Electric air valve controller meritRate output line is connected on Electric air valve YE, Electric air valve YE and electronicMechanical linkage between air-valve valve block, fan frequency converter and Electric air valve controller are connected to respectively workFrequently on supply lines, power frequency supply lines connects the power supply of peripheral hardware, constitutes intake controlDevice.
2. the automatic control dress of a kind of outdoor condenser cooling air quantity according to claim 1Put, it is characterized in that the process that realizes automatic control comprises signal of telecommunication conversion, controls frequency conversion windMachine exhaust air rate and control Electric air valve intake three parts, concrete control procedure is:
(1) signal of telecommunication conversion: the female pipe internal condensation of condenser liquid collecting pressure is by condensing pressure hairTubule is passed to condensing pressure sensor, and condensing pressure is converted to electricity by condensing pressure sensorPressure is greater than 0 and is less than 10V or electric current is greater than the signal of telecommunication that 4mA is less than 20mA, condensing pressure sensorThe signal of telecommunication increase along with the raising of condensing pressure, the signal of telecommunication of condensing pressure sensor withThe reduction of condensing pressure and reduce, the ratio that realizes condensing pressure signal and the signal of telecommunication turnsChange;
(2) control frequency conversion fan exhaust air rate: condensing pressure sensor is changed step (1)The signal of telecommunication flow to fan frequency converter by condensing pressure holding wire, power supply driveFan frequency converter passes through respectively two frequency converter merits according to the signal of telecommunication by the electric energy after frequency-conversion processingRate output line is transferred on two frequency conversion fans, then control frequency conversion fan operating frequency andRotating speed increases along with the increase of the signal of telecommunication, control the operating frequency of frequency conversion fan and rotating speed withReducing of the signal of telecommunication and reduce, and then realizing the exhaust air rate of Linear Control frequency conversion fan;
(3) control Electric air valve intake: condensing pressure sensor is changed step (1)The signal of telecommunication flow to Electric air valve controller by condensing pressure holding wire, power supply drivesMoving Electric air valve controller passes through Electric air valve controller merit according to the signal of telecommunication by power frequency electric energyRate output line is sent to Electric air valve YE, thereby controls the electronic execution of Electric air valveThe rotating of device and action ratio, and then control the electricity that is arranged on casing of outdoor air inlet placeThe aperture of moving air-valve valve block increases along with the increase of the signal of telecommunication, the aperture of Electric air valve valve blockReduce along with reducing of the signal of telecommunication, realize the linearity of Electric air valve intake and automatically control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610134555.4A CN105605747A (en) | 2016-03-10 | 2016-03-10 | Automatic control device of cooling air quantity of outdoor condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610134555.4A CN105605747A (en) | 2016-03-10 | 2016-03-10 | Automatic control device of cooling air quantity of outdoor condenser |
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| Publication Number | Publication Date |
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| CN105605747A true CN105605747A (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610134555.4A Pending CN105605747A (en) | 2016-03-10 | 2016-03-10 | Automatic control device of cooling air quantity of outdoor condenser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106524330A (en) * | 2016-12-06 | 2017-03-22 | 珠海格力电器股份有限公司 | Air conditioner outdoor unit, air conditioner unit and refrigeration control method and heating control method of air conditioner unit |
| CN109708266A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | Air-valve control method and air-conditioning system |
| CN109708273A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | The control method and its device of cryogenic refrigeration air-valve |
| WO2020073646A1 (en) * | 2018-10-10 | 2020-04-16 | 维谛技术有限公司 | Condenser and air conditioning system |
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| CN103335372A (en) * | 2013-07-05 | 2013-10-02 | 成都昊普环保技术有限公司 | Machine room evaporation, refrigeration and heat-extraction system and implementation method |
| CN203240832U (en) * | 2013-03-18 | 2013-10-16 | 浙江盾安机电科技有限公司 | Air-cooled condensation refrigerating unit |
| CN205403065U (en) * | 2016-03-10 | 2016-07-27 | 青岛大学 | Automatic control device of outdoor condenser cooling amount of wind |
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2016
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| CN201526483U (en) * | 2009-10-22 | 2010-07-14 | 同济大学 | Variable speed control system for condensate fan |
| CN102476120A (en) * | 2010-11-23 | 2012-05-30 | 刘辉荣 | Novel fume hood |
| CN202264784U (en) * | 2011-08-23 | 2012-06-06 | 上海法维莱交通车辆设备有限公司 | Novel high-speed train air-conditioning system with frequency-variable fans |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106524330A (en) * | 2016-12-06 | 2017-03-22 | 珠海格力电器股份有限公司 | Air conditioner outdoor unit, air conditioner unit and refrigeration control method and heating control method of air conditioner unit |
| WO2020073646A1 (en) * | 2018-10-10 | 2020-04-16 | 维谛技术有限公司 | Condenser and air conditioning system |
| CN109708266A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | Air-valve control method and air-conditioning system |
| CN109708273A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | The control method and its device of cryogenic refrigeration air-valve |
| CN109708273B (en) * | 2018-12-29 | 2021-10-08 | 广东美的暖通设备有限公司 | Control method and device for low-temperature refrigerating air valve |
| US20210325101A1 (en) * | 2018-12-29 | 2021-10-21 | Hefei Midea Heating & Ventilating Equipment Co., Ltd. | Method and Device for Controlling a Low-Temperature Refrigeration Air Valve |
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Application publication date: 20160525 |