CN102368009B - Control method of electronic expansion valve of indoor machine during refrigerating of convertible frequency air conditioner - Google Patents
Control method of electronic expansion valve of indoor machine during refrigerating of convertible frequency air conditioner Download PDFInfo
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Abstract
The invention discloses a control method of an electronic expansion valve of an indoor machine during refrigerating of a convertible frequency air conditioner. The control method comprises the following steps of: 1, judging whether a microprocessor of the indoor machine (8) is in a heating standby state; 2, regulating the openness of the corresponding indoor electronic expansion valve (7) to reach 30-50 paces by the microprocessor; and 3, keeping the openness of the indoor electronic expansion valve (7) in the step 2 for 2-6min, regulating the openness of the corresponding indoor electronic expansion valve (7) by the microprocessor according to temperatures transmitted by a liquid pipe temperature sensor (9) and an indoor heat exchanger coil temperature sensor (11) every 15-35S in accordance with the following rules: the openness of the regulated indoor electronic expansion valve (7) is equal to the sum of the openness of the indoor electronic expansion valve (7) before the regulation and the openness of the regulation of the indoor electronic expansion valve (7), and the openness of the regulation of the indoor electronic expansion valve (7) is equal to (T3-Tmin-A)*E+delta(T3-Tmin)*F. Compared with the prior art, the control method disclosed by the invention has the characteristics of being suitable for a one-more air conditioner, being capable of effectively ensuring stable operation of the system and improving heating efficiency of the system, being low in energy consumption, and ensuring that the temperature change range of an indoor environment is smaller and the comfort degree of the indoor environment is higher.
Description
Technical field
The present invention relates to a control method of dragging changeable frequency indoor apparatus of air conditioner electric expansion valve, particularly relate to a kind of while being applied to indoor set refrigerating operaton, the control method of convertible frequency air-conditioner indoor set electric expansion valve.
Background technology
One drags many transducer air conditionings, an outer machine can move by dragging multiple indoor set, not only saved the installing space of off-premises station, and there is system simple, compact conformation, comfortable are installed, each room independently regulates operation, the advantages such as energy meets the not different air conditioner load requirements of chummery, and comprehensive coefficient of performance is high, energy-conservation.Along with expanding economy, one drags changeable frequency heat pump air conditioner, and the use in family is more and more extensive at home.
One drag changeable frequency air conditioner room unit general all with reference to the degree of superheat to indoor electronic expansion valve is regulated.What the so-called degree of superheat was exactly refrigerant vapor (steam) temperature after evaporation with saturation temperature under this steam pressure is poor.The microprocessor of indoor set, by detecting the temperature sensor on indoor heat exchanger, is simulated the degree of superheat of the rear refrigerant of evaporation, and according to the degree of superheat, controls the flow of electric expansion valve.The patent No. is that 20071012061.7 " air-conditioning and control the method for its electric expansion valve " proposed a kind of proportion differential algorithm of controlling for one-to-one varying capacity system electronic expansion valve, the degree of superheat numerical value of this algorithm is a fixed value, if while there is excessive situation in the fixed value of setting, increased like this circulation of the indoor set gaseous coolant of heating standby operation, gaseous coolant turns back to the fluid reservoir of off-premises station by indoor electronic expansion valve, increased the enthalpy of refrigerant in fluid reservoir, heat absorption capacity after the throttling of refrigerant in reduction fluid reservoir, thereby the efficiency of machine system is reduced, if while there is too small situation in the fixed value of setting, cold-producing medium in unit will be deposited in the indoor set of standby gradually like this, cause the cold-producing medium circulating in system to lack, enter evaporimeter refrigerant temperature and evaporating temperature and have deviation, and occur that compressor exhaust temperature crosses high fault, energy consumption is higher, finally makes the life-span of air-conditioner shorter, therefore can not effectively be suitable for the multi-split air conditioner that load is larger, and " control method of electric expansion valve " that the patent No. is 200710090097.x proposed a kind of fuzzy algorithmic approach, but the initial adjusting range of electric expansion valve is larger in this method, but also according to the delivery temperature of off-premises station, define the change of the degree of superheat, make the heat exchange amount of heat exchanger limited, and then make delivery temperature higher, very easily cause air-conditioner to occur the situation of report fault or shutdown, operation stability is poor, make again indoor environment temperature excursion larger simultaneously, the comfort level of indoor environment is lower, can not better adapt to multi-split air conditioner.
Therefore the control method of the indoor set electric expansion valve of prior art is all not suitable for multi-split air conditioner.
Summary of the invention
The present invention is directed to above problem a kind of applicable multi-split air conditioner is provided, can effectively guarantee system run all right, and improve system and heat usefulness, energy consumption is lower, make again indoor environment temperature excursion less, the control method of indoor set electric expansion valve during the higher refrigerating of convertible frequency air conditioner of the comfort level of indoor environment simultaneously.
The present invention overcomes the above problems technical scheme used: the control method of indoor set electric expansion valve during a kind of refrigerating of convertible frequency air conditioner, comprises the following steps:
(1), indoor set is while entering refrigeration mode, by the microprocessor of this indoor set and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set, starts compressor, off-premises station and indoor set enter refrigeration control; If off-premises station belongs to refrigerating operaton state, indoor set directly enters refrigeration control; When if off-premises station belongs to heating operation state, after compressor shutdown is restarted, off-premises station and indoor set enter refrigeration control again;
(2), the aperture of 30～50 steps is transferred to the aperture of corresponding indoor electronic expansion valve by microprocessor;
(3), in step, the aperture in (2) keeps 2～6min to indoor electronic expansion valve, the temperature that the every 15～35S of microprocessor passes back according to liquid pipe temperature sensor, indoor heat exchanger coil temperature sensor and indoor heat exchanger escape pipe temperature sensor, regulates once by following principle the aperture of corresponding indoor electronic expansion valve:
The temperature of setting liquid pipe temperature sensor measurement is T1, the temperature of setting indoor heat exchanger coil temperature sensor mensuration is T2, the temperature of setting indoor heat exchanger escape pipe temperature sensor measurement is T3, and the temperature of setting compressor exhaust temperature sensor mensuration is Td;
Aperture after indoor electronic expansion valve regulates=this regulates the aperture of front aperture+this adjusting;
The aperture of this adjusting=(T3-Tmin-A) * E+ Δ (T3-Tmin) * F;
Δ (T3-Tmin) is the rate of change of the degree of superheat, and (T3-Tmin) value that equals this detection deducts (T3-Tmin) value of front one-time detection;
(T3-Tmin-A) >=6 o'clock, E=4, F=2;
(T3-Tmin-A), during ﹤ 6, the value of E, F is according to following principle:
The value of absolute value/2 E=(T3-Tmin-A), by the integer that rounds up and obtain;
The value of absolute value/3 of F=Δ (T3-Tmin), by the integer that rounds up and obtain;
Tmin gets that of numerical value minimum in T1 and T2;
A=A0+ Δ SH; A0 is that the initial target degree of superheat of indoor set is constant, is generally 2～4 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; Indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, every 2～6min detects the temperature T d of compressor exhaust temperature sensor, according to following rule, controls Δ SH:
Td≤69℃，ΔSH=ΔSH＇-0.5；
69℃≤Td≤93℃，ΔSH=ΔSH＇；
Td>93℃，ΔSH=ΔSH＇+0.5；
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
Described step (2) in, corresponding indoor electronic expansion valve is transferred to the aperture of 40 steps.
Described step (3) middle aperture keeps 4min.
Described A0 is 2 ℃.
The frequency of the temperature T d of described detection compressor exhaust temperature sensor be every 4min once.
Adopt after above method, the present invention compared with prior art, due to according to the feature of multi-split air conditioner, the temperature T 3 having increased by the variation of the degree of superheat and the temperature T d of compressor exhaust temperature sensor and indoor heat exchanger escape pipe temperature sensor judges, according to different situations, carry out the aperture of electric expansion valve in conditioning chamber, can effectively prevent that the situation that aperture is too small or excessive from appearring in indoor electronic expansion valve, can effectively guarantee system run all right, and improve system and heat usefulness, energy consumption is lower, make the change curve of indoor electronic expansion valve opening more approach the change curve of the indoor electronic expansion valve opening under desirable state of a control, and then indoor set heat exchanger evaporating temperature fluctuating range reduces, and make indoor environment temperature excursion also relatively little, the comfort level of indoor environment is higher.
Accompanying drawing explanation
The electrical schematic diagram of the control method of indoor set electric expansion valve when accompanying drawing is refrigerating of convertible frequency air conditioner of the present invention.
As shown in the figure: 1, compressor, 101, compressor exhaust temperature sensor, 2, gas-liquid separator, 3, cross valve, 4, outdoor unit heat exchanger, 5, outdoor electric expansion valve and check valve assembly, 6, reservoir, 7, indoor electronic expansion valve, 8, indoor set, 9, liquid pipe temperature sensor, 10, indoor heat exchanger coil temperature sensor, 11, indoor environment temperature sensor, 12, indoor heat exchanger escape pipe temperature sensor.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described further.
As shown in drawings, an off-premises station is provided with the indoor set 8 of a plurality of parallel connections and the pipeline of interior electric expansion valve 7 compositions of its respective chamber/chambers.During frequency conversion heat pump operation of air conditioner, the gases at high pressure that compressor 1 is discharged enter indoor set 8 through cross valve 3 and carry out condensation, after condensation, liquid is through the laggard reservoir 6 that enters outdoor unit of the suitable adjusting of indoor electronic expansion valve 7, after entering reservoir 6, need to pass through outdoor electric expansion valve 5, outdoor electric expansion valve 5 is controlled by microprocessor, reservoir 6 refrigerant is out carried out to throttling, gas-liquid mixed refrigerant after throttling enters outdoor unit heat exchanger 4 and evaporates, again through cross valve 3 commutations, enter gas-liquid separator 2, gas after gas-liquid separator 2 separation enters compressor 1 recompression, thereby complete a heat pump cycle.Wherein compressor 1 blast pipe is provided with compressor exhaust temperature sensor 101, on pipeline between the indoor electronic expansion valve 7 corresponding thereto of indoor set 8 one end and heat exchange coil, be respectively equipped with liquid pipe temperature sensor 9 and indoor heat exchanger coil temperature sensor 10, be used for gathering the temperature data of pipeline and heat exchanger dish; Indoor set 8 is provided with indoor environment temperature sensor 11 and indoor heat exchanger escape pipe temperature sensor 12, is used for gathering the data of indoor temperature.Indoor electronic expansion valve 7 pipelines that other indoor set 8 in parallel is corresponding with it are same as described above.In accompanying drawing, also have the accessory of some systems not show.
The pipeline of indoor electronic expansion valve 7 corresponding thereto of indoor set 8 on a road wherein of take is below example.
A control method for indoor set electric expansion valve during refrigerating of convertible frequency air conditioner, comprises the following steps:
(1), indoor set 8 is while entering refrigeration mode, by the microprocessor of this indoor set 8 and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set 8, starts compressor 1, off-premises station and indoor set 8 enter refrigeration control; If off-premises station belongs to refrigerating operaton state, indoor set 8 directly enters refrigeration control; When if off-premises station belongs to heating operation state, after compressor 1 is shut down and restarted, off-premises station and indoor set 8 enter refrigeration control again;
(2), the aperture of 30 steps is transferred to the aperture of corresponding indoor electronic expansion valve 7 by microprocessor;
(3), in step, the aperture in (2) keeps 6min to indoor electronic expansion valve 7, the temperature that the every 35S of microprocessor passes back according to liquid pipe temperature sensor 9, indoor heat exchanger coil temperature sensor 11 and indoor heat exchanger escape pipe temperature sensor 12, regulates once by following principle the aperture of corresponding indoor electronic expansion valve 7:
The temperature of setting liquid pipe temperature sensor 9 mensuration is T1, the temperature of setting indoor heat exchanger coil temperature sensor 10 mensuration is T2, the temperature of setting indoor heat exchanger escape pipe temperature sensor 12 mensuration is T3, and the temperature of setting compressor exhaust temperature sensor 101 mensuration is Td;
Aperture after indoor electronic expansion valve 7 regulates=this regulates the aperture of front aperture+this adjusting;
The aperture of this adjusting=(T3-Tmin-A) * E+ Δ (T3-Tmin) * F;
Δ (T3-Tmin) is the rate of change of the degree of superheat, and (T3-Tmin) value that equals this detection deducts (T3-Tmin) value of front one-time detection;
(T3-Tmin-A) >=6 o'clock, E=4, F=2;
(T3-Tmin-A), during ﹤ 6, the value of E, F is according to following principle:
The value of absolute value/2 E=(T3-Tmin-A), by the integer that rounds up and obtain;
The value of absolute value/3 of F=Δ (T3-Tmin), by the integer that rounds up and obtain;
Tmin gets that of numerical value minimum in T1 and T2;
A=A0+ Δ SH; A0 is 4 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; Indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, the temperature T d of every 6min detection compressor exhaust temperature sensor 101 once, controls Δ SH according to following rule:
Td≤69℃，ΔSH=ΔSH＇-0.5；
69℃≤Td≤93℃，ΔSH=ΔSH＇；
Td>93℃，ΔSH=ΔSH＇+0.5；
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
A control method for indoor set electric expansion valve during refrigerating of convertible frequency air conditioner, comprises the following steps:
(1), indoor set 8 is while entering refrigeration mode, by the microprocessor of this indoor set 8 and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set 8, starts compressor 1, off-premises station and indoor set 8 enter refrigeration control; If off-premises station belongs to refrigerating operaton state, indoor set 8 directly enters refrigeration control; When if off-premises station belongs to heating operation state, after compressor 1 is shut down and restarted, off-premises station and indoor set 8 enter refrigeration control again;
(2), the aperture of 50 steps is transferred to the aperture of corresponding indoor electronic expansion valve 7 by microprocessor;
(3), in step, the aperture in (2) keeps 2min to indoor electronic expansion valve 7, the temperature that the every 25S of microprocessor passes back according to liquid pipe temperature sensor 9, indoor heat exchanger coil temperature sensor 11 and indoor heat exchanger escape pipe temperature sensor 12, regulates once by following principle the aperture of corresponding indoor electronic expansion valve 7:
The temperature of setting liquid pipe temperature sensor 9 mensuration is T1, the temperature of setting indoor heat exchanger coil temperature sensor 10 mensuration is T2, the temperature of setting indoor heat exchanger escape pipe temperature sensor 12 mensuration is T3, and the temperature of setting compressor exhaust temperature sensor 101 mensuration is Td;
Aperture after indoor electronic expansion valve 7 regulates=this regulates the aperture of front aperture+this adjusting;
The aperture of this adjusting=(T3-Tmin-A) * E+ Δ (T3-Tmin) * F;
Δ (T3-Tmin) is the rate of change of the degree of superheat, and (T3-Tmin) value that equals this detection deducts (T3-Tmin) value of front one-time detection;
(T3-Tmin-A) >=6 o'clock, E=4, F=2;
(T3-Tmin-A), during ﹤ 6, the value of E, F is according to following principle:
The value of absolute value/2 E=(T3-Tmin-A), by the integer that rounds up and obtain;
The value of absolute value/3 of F=Δ (T3-Tmin), by the integer that rounds up and obtain;
Tmin gets that of numerical value minimum in T1 and T2;
A=A0+ Δ SH; A0 is 3 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; Indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, the temperature T d of every 2min detection compressor exhaust temperature sensor 101 once, controls Δ SH according to following rule:
Td≤69℃，ΔSH=ΔSH＇-0.5；
69℃≤Td≤93℃，ΔSH=ΔSH＇；
Td>93℃，ΔSH=ΔSH＇+0.5；
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
A control method for indoor set electric expansion valve during refrigerating of convertible frequency air conditioner, comprises the following steps:
(1), indoor set 8 is while entering refrigeration mode, by the microprocessor of this indoor set 8 and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set 8, starts compressor 1, off-premises station and indoor set 8 enter refrigeration control; If off-premises station belongs to refrigerating operaton state, indoor set 8 directly enters refrigeration control; When if off-premises station belongs to heating operation state, after compressor 1 is shut down and restarted, off-premises station and indoor set 8 enter refrigeration control again;
(2), the aperture of 40 steps is transferred to the aperture of corresponding indoor electronic expansion valve 7 by microprocessor;
(3), in step, the aperture in (2) keeps 4min to indoor electronic expansion valve 7, the temperature that the every 15S of microprocessor passes back according to liquid pipe temperature sensor 9, indoor heat exchanger coil temperature sensor 11 and indoor heat exchanger escape pipe temperature sensor 12, regulates once by following principle the aperture of corresponding indoor electronic expansion valve 7:
The temperature of setting liquid pipe temperature sensor 9 mensuration is T1, the temperature of setting indoor heat exchanger coil temperature sensor 10 mensuration is T2, the temperature of setting indoor heat exchanger escape pipe temperature sensor 12 mensuration is T3, and the temperature of setting compressor exhaust temperature sensor 101 mensuration is Td;
Aperture after indoor electronic expansion valve 7 regulates=this regulates the aperture of front aperture+this adjusting;
The aperture of this adjusting=(T3-Tmin-A) * E+ Δ (T3-Tmin) * F;
Δ (T3-Tmin) is the rate of change of the degree of superheat, and (T3-Tmin) value that equals this detection deducts (T3-Tmin) value of front one-time detection;
(T3-Tmin-A) >=6 o'clock, E=4, F=2;
(T3-Tmin-A), during ﹤ 6, the value of E, F is according to following principle:
The value of absolute value/2 E=(T3-Tmin-A), by the integer that rounds up and obtain;
The value of absolute value/3 of F=Δ (T3-Tmin), by the integer that rounds up and obtain;
Tmin gets that of numerical value minimum in T1 and T2;
A=A0+ Δ SH; A0 is 2 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; Indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, the temperature T d of every 4min detection compressor exhaust temperature sensor 101 once, controls Δ SH according to following rule:
Td≤69℃，ΔSH=ΔSH＇-0.5；
69℃≤Td≤93℃，ΔSH=ΔSH＇；
Td>93℃，ΔSH=ΔSH＇+0.5；
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
Above embodiment is only preferred embodiment of the present invention, and the present invention is not limited only to above embodiment and has also allowed other structural change, allly in rights to independence claimed range of the present invention, changes, and all belongs to protection domain of the present invention.
Claims (5)
1. a control method for indoor set electric expansion valve during refrigerating of convertible frequency air conditioner, is characterized in that: comprise the following steps:
(1), indoor set (8) is while entering refrigeration mode, by the microprocessor of this indoor set (8) and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set (8), starts compressor (1), off-premises station and indoor set (8) enter refrigeration control; If off-premises station belongs to refrigerating operaton state, indoor set (8) directly enters refrigeration control; When if off-premises station belongs to heating operation state, after compressor (1) is shut down and restarted, off-premises station and indoor set (8) enter refrigeration control again;
(2), the aperture of 30～50 steps is transferred to the aperture of corresponding indoor electronic expansion valve (7) by microprocessor;
(3), in step, the aperture in (2) keeps 2～6min to indoor electronic expansion valve (7), the temperature that the every 15～35S of microprocessor passes back according to liquid pipe temperature sensor (9), indoor heat exchanger coil temperature sensor (10) and indoor heat exchanger escape pipe temperature sensor (12), regulates once by following principle the aperture of corresponding indoor electronic expansion valve (7):
The temperature of setting liquid pipe temperature sensor (9) mensuration is T1, the temperature of setting indoor heat exchanger coil temperature sensor (10) mensuration is T2, the temperature of setting indoor heat exchanger escape pipe temperature sensor (12) mensuration is T3, and the temperature of setting compressor exhaust temperature sensor (101) mensuration is Td;
Aperture after indoor electronic expansion valve (7) regulates=this regulates the aperture of front aperture+this adjusting;
The aperture of this adjusting=(T3-Tmin-A) * E+ Δ (T3-Tmin) * F;
Δ (T3-Tmin) is the rate of change of the degree of superheat, and (T3-Tmin) value that equals this detection deducts (T3-Tmin) value of front one-time detection;
(T3-Tmin-A) >=6 o'clock, E=4, F=2;
(T3-Tmin-A), during ﹤ 6, the value of E, F is according to following principle:
The value of absolute value/2 E=(T3-Tmin-A), by the integer that rounds up and obtain;
The value of absolute value/3 of F=Δ (T3-Tmin), by the integer that rounds up and obtain;
Tmin gets that of numerical value minimum in T1 and T2;
A=A0+ Δ SH; A0 is that the initial target degree of superheat of indoor set is constant, is 2～4 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; Indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, every 2～6min detects the temperature T d of compressor exhaust temperature sensor (101), according to following rule, controls Δ SH:
Td＜69℃，ΔSH=ΔSH＇-0.5；
69℃≤Td≤93℃，ΔSH=ΔSH＇；
Td＞93℃，ΔSH=ΔSH＇+0.5；
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
2. the control method of indoor set electric expansion valve during refrigerating of convertible frequency air conditioner according to claim 1, is characterized in that: described step (2) in, corresponding indoor electronic expansion valve (7) is transferred to the aperture of 40 steps.
3. the control method of indoor set electric expansion valve during refrigerating of convertible frequency air conditioner according to claim 1, is characterized in that: described step (3) in aperture keep 4min.
4. the control method of indoor set electric expansion valve during refrigerating of convertible frequency air conditioner according to claim 1, is characterized in that: described A0 is 2 ℃.
5. the control method of indoor set electric expansion valve during refrigerating of convertible frequency air conditioner according to claim 1, is characterized in that: the frequency of the temperature T d of described detection compressor exhaust temperature sensor (101) be every 4min once.
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| CN201110350497.6A CN102368009B (en) | 2011-11-09 | 2011-11-09 | Control method of electronic expansion valve of indoor machine during refrigerating of convertible frequency air conditioner |
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| CN201110350497.6A CN102368009B (en) | 2011-11-09 | 2011-11-09 | Control method of electronic expansion valve of indoor machine during refrigerating of convertible frequency air conditioner |
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| CN105066326B (en) * | 2015-07-15 | 2017-12-12 | 广东美的暖通设备有限公司 | A kind of air conditioning control method, system and air-conditioning |
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| CN109751740A (en) * | 2018-12-12 | 2019-05-14 | 广东美的暖通设备有限公司 | For the control method of multi-gang air-conditioner, device, outdoor unit and multi-gang air-conditioner |
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| KR100471453B1 (en) * | 2002-11-22 | 2005-03-08 | 엘지전자 주식회사 | a heat pump system and a linear expansion valve's control method for the same |
| KR100757442B1 (en) * | 2005-12-29 | 2007-09-11 | 엘지전자 주식회사 | Air conditioner |
| KR100886887B1 (en) * | 2008-10-24 | 2009-03-05 | (주)동양테크놀로지 | Heat-pump type air-conditioner |
| CN101509693B (en) * | 2009-03-16 | 2011-05-18 | 宁波奥克斯电气有限公司 | Control method of frequency conversion heat pump outdoor machine of air-conditioner electronic expansion valve |
| CN101539322B (en) * | 2009-03-31 | 2011-06-01 | 宁波奥克斯电气有限公司 | Method for controlling electronic expansion valve of heating standby indoor unit |
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo AUX Electric Co., Ltd. |