KR20010063561A - Methode For Controlling The Evapora tion Valve Of Air-Conditioner - Google Patents

Methode For Controlling The Evapora tion Valve Of Air-Conditioner Download PDF

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Publication number
KR20010063561A
KR20010063561A KR1019990060676A KR19990060676A KR20010063561A KR 20010063561 A KR20010063561 A KR 20010063561A KR 1019990060676 A KR1019990060676 A KR 1019990060676A KR 19990060676 A KR19990060676 A KR 19990060676A KR 20010063561 A KR20010063561 A KR 20010063561A
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KR
South Korea
Prior art keywords
electronic expansion
expansion valve
temperature
refrigerant
air conditioner
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KR1019990060676A
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Korean (ko)
Inventor
김영찬
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황한규
만도공조 주식회사
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Priority to KR1019990060676A priority Critical patent/KR20010063561A/en
Publication of KR20010063561A publication Critical patent/KR20010063561A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2521—On-off valves controlled by pulse signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

PURPOSE: A control method of an electronic expansion valve is provided to promote the optimum air-conditioning by checking a frozen electronic expansion valve in an inverter air conditioner. CONSTITUTION: A control unit adjusts the opening of two electronic expansion valves. Plural capillary temperature sensors decide whether refrigerant temperature of liquid refrigerant tubes is higher than 5 deg.C. If so, the control unit adjusts the opening of the electronic expansion valves again. Otherwise, the control unit increases the opening of the electronic expansion valves. If the temperature of the liquid refrigerant tubes is higher than 8 deg.C, the control unit sets the opening of the electronic expansion valves again. Otherwise, the control unit increases the opening of the valves. Therefore, the control unit prevents the electronic expansion valves from freezing by adjusting the refrigerant temperature.

Description

에어콘의 전자팽창밸브 제어방법 { Methode For Controlling The Evapora tion Valve Of Air-Conditioner }Method for Controlling The Evaporation Valve Of Air-Conditioner

본 발명은 에어콘의 전자팽창밸브를 제어하는 방법에 관한 것으로, 특히, 인버터에어콘에서 전자팽창밸브를 감시하여 동결이 발생하기 전에 미리 동결 상태를 파악하므로 전자팽창밸브의 작동 불량으로 인한 에어콘의 성능 저하를 방지하여 최적의 냉방 상태를 구현할 수 있으며, 전자팽창밸브의 보호 및 정확한 동작으로 제품의 신뢰성을 얻도록 하는 에어콘의 전자팽창밸브 제어방법에 관한 것이다.The present invention relates to a method of controlling an electronic expansion valve of an air conditioner, and in particular, by monitoring the electronic expansion valve in the inverter air conditioner to determine the freezing state before the freezing occurs, the performance of the air conditioner due to malfunction of the electronic expansion valve The present invention relates to a control method of an electronic expansion valve for an air conditioner, which can achieve an optimal cooling state by preventing the electrical expansion valve, and to obtain the reliability of the product by protecting and correcting the electronic expansion valve.

일반적으로, 에어콘은 냉방기의 일종으로서, 모터가 구동되는 응축기로 냉매를 고압으로 압축하여 액화시키고, 이 고압으로 응축된 냉매를 관의 직경이 작은 모세관파이프로 이동시키면서 증발기에서 냉매를 순간적으로 기화시켜 증발시키므로 온도를 강하시켜 냉기를 발생하고, 이때 발생된 냉기를 실내로 토출시키므로 냉방을 수행하게 되는 것이다.In general, an air conditioner is a type of air conditioner that compresses and liquefies a refrigerant at a high pressure with a condenser driven by a motor, and instantly vaporizes the refrigerant in an evaporator while moving the refrigerant condensed at a high pressure into a capillary pipe having a small diameter. By evaporating, the temperature is lowered to generate cold air, and thus cooling is performed by discharging the generated cold air into the room.

그리고, 증발기에서 증발되면서 열을 흡수하면서 기화된 냉매는 압축기에서 응축기로 이동하여 응축되어 액화되면서 열을 외부로 방출하여 상기한 과정을 거쳐지속적으로 냉방을 수행하게 되는 것이다.The refrigerant vaporized while absorbing heat while being evaporated in an evaporator is condensed by moving from a compressor to a condenser and liquefied to release heat to the outside to continuously cool through the above process.

도 1은 일반적인 1실 에어콘의 개략적인 시스템 구성을 보인 도면이고, 도 2는 일반적인 2실 에어콘의 개략적인 시스템구성을 보인 도면이며, 도 3은 일반적인전자팽창밸브와 압축기를 마이컴으로 제어하는 상태를 보인 도면이다.1 is a view showing a schematic system configuration of a typical one-room air conditioner, FIG. 2 is a view showing a schematic system configuration of a general two-room air conditioner, and FIG. 3 shows a state in which a general electronic expansion valve and a compressor are controlled by a microcomputer. The figure shown.

도 1과 도 2에 도시된 바와 같이, 1실 및 2실 에어콘의 차이점은, 소정의 장소에 냉기를 공급하는 실내열교환기(30)와 그에 관련된 부품이 1개의 장소에 공급하도록 구성되는냐, 혹은 2개의 장소에 공급되는 냐의 차이점에 있는 것으로서, 실제적으로 동일한 구성으로 간주하고 살펴 보도록 한다. 그리고, 2실 이상의 대형 건물에 적용되는 멀티 에어콘의 경우에도 동일하게 적용된다고 간주 한다.As shown in Fig. 1 and Fig. 2, the difference between the one-room and two-room air conditioner is that the indoor heat exchanger 30 for supplying cold air to a predetermined place and its related parts are configured to supply to one place, Or, it is the difference between the two places that are supplied, and consider them as the same configuration. In addition, the same applies to the case of a multi-air conditioner applied to two or more large buildings.

먼저, 실내열교환기(30)(130)에서 액체 상태에서 기체 상태로 팽창하면서 냉기를 공급한 냉매는 가스관(95)(195)을 통하여 이동하여서 압축기(20)(120)로 유입되어져 고압의 기체로 압축되어지게 된다.First, the refrigerant supplied with cold air while expanding from a liquid state to a gaseous state in the indoor heat exchanger (30) (130) moves through the gas pipes (95) (195) and flows into the compressor (20) (120), thereby providing high pressure gas. To be compressed.

그런 후에 실외열교환기(10)(110)에서 고온의 열을 외부로 배출하여서 냉매를 식혀서 액체 상태로 만든 후 전자팽창밸브(40)(140)로 이동시키도록 한다.Then, the outdoor heat exchanger (10) (110) to discharge the high temperature heat to the outside to cool the refrigerant to a liquid state to move to the electronic expansion valve (40, 140).

그리고, 상기 전자팽창밸브(40)(140)에서는 냉매를 급속하게 저온의 액체로 만들어서 상기 실내열교환기(30)(130)로 공급하게 되고, 상기한 과정을 거쳐서 냉방을 수행하도록 한다.In addition, the electronic expansion valve 40, 140 is made to cool the liquid rapidly to the low-temperature liquid to supply to the indoor heat exchanger (30, 130), to perform the cooling through the above process.

이 때, 상기 액관(90)(19)에는 액관밸브(50)(150)가 설치되고, 가스관 (95)(195)에는 가스관밸브(60)16)가 설치되어져 있어서, 냉매의 량을 조절할 수 있다.At this time, the liquid pipe (90, 19) is provided with a liquid pipe valve 50, 150, the gas pipe (95, 195) is provided with a gas pipe valve 60, 16, it is possible to adjust the amount of refrigerant have.

그리고, 상기 전자팽창밸브(40)(140)에는 구동부(82)(182)를 설치하여 전자팽창밸브(40)(140)의 동작을 마이컴(85)(1850으로 제어하도록 한다. 그리고, 전자팽창밸브(40)(140)의 출구 온도를 세관온도센서(70)(170)에서 감지하여서 가스관(95)(195)에 설치된 대관온도센서(80)(180)에서 감지하도록 한다.In addition, driving units 82 and 182 are installed in the electromagnetic expansion valves 40 and 140 to control the operation of the electromagnetic expansion valves 40 and 140 to the microcomputer 85 and 1850. The outlet temperature of the valves 40 and 140 is sensed by the customs temperature sensors 70 and 170 so as to be sensed by the tube temperature sensors 80 and 180 installed in the gas pipes 95 and 195.

그런데, 종래의 1실 혹은 2실에어콘은 냉매량의 조절을 위하여 전자팽창밸브를 제어함에 있어서, 냉매온도, 냉매의 유량, 냉매의 압력 및 온도 센서에 의한 개도량 제어시의 오차등에 의한 전자팽창밸브의 동결이 발생할 수 잇는 문제점아 있으며, 그로 인하여 전자팽창밸브에 동결이 발생하는 경우, 최적의 냉방 상태를 유지할 수 없음은 물론이고, 냉매가 실내 열교환기로 유입되지 않는 상태가 발생될 수가 있으며, 압축기 및 시스템의 효율에 큰 영향을 미칠 우려가 있다.By the way, the conventional one or two air conditioner controls the electronic expansion valve to control the amount of refrigerant, the electronic expansion valve due to the refrigerant temperature, the flow rate of the refrigerant, the pressure of the refrigerant and the error in the opening amount control by the temperature sensor, etc. There is a problem that may cause the freezing of the, and when the freezing occurs in the electronic expansion valve, it is not possible to maintain the optimal cooling state, the refrigerant may not flow into the indoor heat exchanger may occur, And a great influence on the efficiency of the system.

본 발명은 이러한 점을 감안하여 안출한 것으로서, 인버터에어콘에서 전자팽창밸브를 감시하여 동결이 발생하기 전에 미리 동결 상태를 파악하므로 전자팽창밸브의 작동 불량으로 인한 에어콘의 성능 저하를 방지하여 최적의 냉방 상태를 구현할 수 있으며, 전자팽창밸브의 보호 및 정확한 동작으로 제품의 신뢰성을 얻도록 하는 것이 목적이다.The present invention has been devised in view of this point, and by monitoring the electronic expansion valve in the inverter air conditioner to grasp the freezing state before the freezing occurs, it prevents the air conditioner performance degradation due to the malfunction of the electronic expansion valve for optimal cooling The purpose is to realize the state, and to ensure the reliability of the product by the protection and correct operation of the electronic expansion valve.

도 1은 일반적인 1실 에어콘의 개략적인 시스템 구성을 보인 도면이고,1 is a view showing a schematic system configuration of a typical one-room air conditioner,

도 2는 일반적인 2실 에어콘의 개략적인 시스템구성을 보인 도면이며,2 is a view showing a schematic system configuration of a typical two-room air conditioner,

도 3은 일반적인 전자팽창밸브와 압축기를 마이컴으로 제어하는 상태를 보인 도면이고,3 is a view illustrating a state in which a general electronic expansion valve and a compressor are controlled by a microcomputer,

도 4은 본 발명에 따른 전자팽창밸브를 제어하기 위한 흐름 상태를 보인 도면이다.4 is a view showing a flow state for controlling the electronic expansion valve according to the present invention.

-도면의 주요부분에 대한 부호의 설명-Explanation of symbols on the main parts of the drawing

10 : 실외열교환기 20,120 : 압축기10: outdoor heat exchanger 20,120: compressor

30,130 : 실내열교환기 40,140 : 전자팽창밸브30,130: Indoor heat exchanger 40,140: Electronic expansion valve

50,150 : 액관밸브 60,160 : 가스관밸브50,150: liquid pipe valve 60,160: gas pipe valve

70,170 : 세관온도센서 72,172 : 인버터제어부70,170: Customs temperature sensor 72,172: Inverter control unit

80,180 : 대관온도센서 82,182 : 구동부80,180: pipe temperature sensor 82,182: drive unit

85,185 : 마이컴 90,190 : 액관85,185: Micom 90,190: Liquid pipe

95,195 : 가스관95,195: gas pipe

이러한 목적은 실내,외열교환기를 구비하여 냉방을 수행하는 에어콘에 있어서, 에어콘의 전자팽창밸브의 개도량을 조절하는 단계와; 상기 전자팽창밸브에서 액관으로 이동하고, 세관온도센서에 의하여 감지되는 냉매의 온도가 5℃이상인지 아닌지 여부를 판단하는 단계와; 상기 냉매의 온도가 5℃이상인 경우, 전자팽창밸브의 개도량을 조절하는 단계로 복귀하거나, 냉매의 온도가 5℃이하인 경우, 전자팽창밸브의 개도량을 증가하는 단계와; 상기 단계 후에 액관으로 이동하는 냉매의 온도가 8℃ 이상인 지 아닌지를 판단하여 8℃ 이상인 경우 처음 단계로 복귀하고, 그 8℃ 이하인 경우, 전자 팽창밸브 개도량 증가 단계로 복귀하는 단계를 포함하여 이루어진 것을 특징으로 하는 에어콘의 전자팽창밸브 제어방법를 제공함으로써 달성된다.An object of the present invention is to provide an indoor and an external heat exchanger for cooling an air conditioner, the method comprising: adjusting an opening amount of an electromagnetic expansion valve of an air conditioner; Moving from the electromagnetic expansion valve to the liquid pipe, and determining whether or not the temperature of the refrigerant detected by the customs temperature sensor is 5 ° C. or more; When the temperature of the refrigerant is 5 ° C. or more, returning to adjusting the opening amount of the electromagnetic expansion valve, or when the temperature of the refrigerant is 5 ° C. or less, increasing the opening amount of the electromagnetic expansion valve; After the step is determined whether the temperature of the refrigerant moving to the liquid pipe is 8 ℃ or more, and if it is 8 ℃ or more, and if it is less than 8 ℃, the step of returning to the step of increasing the opening amount of the electronic expansion valve made It is achieved by providing a method for controlling an electronic expansion valve of an air conditioner.

이하, 본 발명에 따른 제어방법을 상세하게 살펴 보도록 한다.Hereinafter, the control method according to the present invention will be described in detail.

도 4은 본 발명에 따른 전자팽창밸브를 제어하기 위한 흐름 상태를 보인 도면이다.4 is a view showing a flow state for controlling the electronic expansion valve according to the present invention.

본 발명에 따른 멀티에어콘의 전자팽창밸브 제어방법에서, 표시되는 구성의 도면부호는 종래의 일반적인 에어콘 구성의 부호와 동일 부호를 사용하도록 한다.In the method for controlling an electronic expansion valve of a multi-air conditioner according to the present invention, the reference numerals of the displayed components are to be the same as those of the conventional general air conditioner configuration.

상기 실외열교환기(10)에서 열을 외부로 발산한 냉매가, 액관(90)을 통하여 전자팽창밸브(40)(140)에서 냉매를 팽창시키게 된다.The refrigerant that radiates heat to the outside in the outdoor heat exchanger 10 expands the refrigerant in the electromagnetic expansion valves 40 and 140 through the liquid pipe 90.

이 때, 도 4에 도시된 바와 같이, 전자팽창밸브(40)(140)의 개도량을 조절하도록 한다.(S10)At this time, as shown in Figure 4, to adjust the opening amount of the electromagnetic expansion valve 40, 140. (S10)

그리고, 상기 전자팽창밸브(40)(140)에서 토출되는 냉매의 온도를 세관온도센서(70)(170)에서 액관(90)(190)의 냉매 온도가 5℃이상인 지 아닌지 여부를 판단하도록 한다.(S20)Then, the temperature of the refrigerant discharged from the electromagnetic expansion valve 40, 140 to determine whether the refrigerant temperature of the liquid pipe (90, 190) in the tubular temperature sensor 70, 170 is 5 ℃ or more. (S20)

상기 액관(90)의 냉매 온도가 5℃ 이상인 경우에는 상기 전자팽창밸브 (40)(140)의 개도량을 조절하는 단계(S10)로 복귀하도록 한다.When the coolant temperature of the liquid pipe 90 is 5 ° C. or more, the flow returns to step S10 of adjusting the opening amount of the electromagnetic expansion valves 40 and 140.

그리고, 상기 액관(90)의 냉매 온도가 5℃ 이하인 경우에는 상기 전자팽창밸브(40)(140)의 개도량을 증가하도록 한다,(S30)In addition, when the refrigerant temperature of the liquid pipe 90 is 5 ° C. or less, the opening amount of the electromagnetic expansion valves 40 and 140 may be increased (S30).

그리고, 상기 액관(90)의 온도가 8℃ 이상인 경우에는 상기 전자팽창밸브 (40)(140) 개도량조절 단계(S10)로 복귀하도록 한다. 또한, 액관(90)의 온도가 8℃ 이하인 경우에는 전자팽창밸브(40)(140) 개도량증가 단계(S30)로 복귀하여 전자팽창밸브(40)(140)의 냉매 온도를 조절하여 전자팽창밸브(40)(140)의 동결을 방지하도록 한다.And, when the temperature of the liquid pipe 90 is 8 ℃ or more to return to the electromagnetic expansion valve 40, 140 opening amount adjustment step (S10). In addition, when the temperature of the liquid pipe 90 is 8 ° C. or less, returning to the step of increasing the amount of opening of the electronic expansion valves 40 and 140 (S30) to adjust the refrigerant temperature of the electromagnetic expansion valves 40 and 140 to adjust the electronic expansion. To prevent the freezing of the valve 40, 140.

따라서, 상기한 바와 같이 본 발명에 따른 에어콘의 전자팽창밸브제어방법을 사용하게 되면. 인버터에어콘에서 전자팽창밸브를 감시하여 동결이 발생하기 전에 미리 동결 상태를 파악하므로 전자팽창밸브의 작동 불량으로 인한 에어콘의 성능 저하를 방지하여 최적의 냉방 상태를 구현할 수 있으며, 전자팽창밸브의 보호 및 정확한 동작으로 제품의 신뢰성을 얻도록 하는 매우 유용하고 효과적인 발명이다.Therefore, when the electromagnetic expansion valve control method of the air conditioner according to the present invention as described above. By monitoring the electronic expansion valve in the inverter air conditioner and grasp the freezing state before freezing occurs, it is possible to realize the optimal cooling state by preventing the air conditioner from degrading due to the malfunction of the electronic expansion valve. It is a very useful and effective invention to get the reliability of the product with correct operation.

Claims (1)

실내,외열교환기를 구비하여 냉방을 수행하는 에어콘에 있어서,In an air conditioner for cooling by indoor and external heat exchanger, 에어콘의 전자팽창밸브의 개도량을 조절하는 단계와;Adjusting the opening amount of the electromagnetic expansion valve of the air conditioner; 상기 전자팽창밸브에서 액관으로 이동하고, 세관온도센서에 의하여 감지되는 냉매의 온도가 5℃이상인지 아닌지 여부를 판단하는 단계와;Moving from the electromagnetic expansion valve to the liquid pipe, and determining whether or not the temperature of the refrigerant detected by the customs temperature sensor is 5 ° C. or more; 상기 냉매의 온도가 5℃이상인 경우, 전자팽창밸브의 개도량을 조절하는 단계로 복귀하거나, 냉매의 온도가 5℃이하인 경우, 전자팽창밸브의 개도량을 증가하는 단계와;When the temperature of the refrigerant is 5 ° C. or more, returning to adjusting the opening amount of the electromagnetic expansion valve, or when the temperature of the refrigerant is 5 ° C. or less, increasing the opening amount of the electromagnetic expansion valve; 상기 단계 후에 액관으로 이동하는 냉매의 온도가 8℃ 이상인 지 아닌지를 판단하여 8℃ 이상인 경우 처음 단계로 복귀하고, 그 8℃ 이하인 경우, 전자 팽창밸브 개도량 증가 단계로 복귀하는 단계를 포함하여 이루어진 것을 특징으로 하는 에어콘의 전자팽창밸브 제어방법.After the step is determined whether the temperature of the refrigerant moving to the liquid pipe is 8 ℃ or more, and if it is 8 ℃ or more, and if it is less than 8 ℃, the step of returning to the step of increasing the opening amount of the electronic expansion valve made An electronic expansion valve control method for an air conditioner.
KR1019990060676A 1999-12-22 1999-12-22 Methode For Controlling The Evapora tion Valve Of Air-Conditioner KR20010063561A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100442788B1 (en) * 2001-09-12 2004-08-04 위니아만도 주식회사 Method for controlling the electronic expansion valve of a inverter kimchi refrigerator
KR100743720B1 (en) * 2005-09-15 2007-07-30 엘지전자 주식회사 Process for sensing badness of LEV in sub-cooling apparatus of multi-type air conditioner
CN102331067A (en) * 2011-05-24 2012-01-25 宁波奥克斯电气有限公司 Control method for protection of compressor during refrigeration cycle of direct-current frequency-conversion air conditioner
CN102353120A (en) * 2011-08-31 2012-02-15 宁波奥克斯电气有限公司 Control method for preventing refrigerant partial flowing in refrigeration of multi-connection-type air-conditioning unit
CN105865096A (en) * 2016-04-29 2016-08-17 宁波奥克斯电气股份有限公司 Method and unit for improving heating effect of multi-connected machine set

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100442788B1 (en) * 2001-09-12 2004-08-04 위니아만도 주식회사 Method for controlling the electronic expansion valve of a inverter kimchi refrigerator
KR100743720B1 (en) * 2005-09-15 2007-07-30 엘지전자 주식회사 Process for sensing badness of LEV in sub-cooling apparatus of multi-type air conditioner
CN102331067A (en) * 2011-05-24 2012-01-25 宁波奥克斯电气有限公司 Control method for protection of compressor during refrigeration cycle of direct-current frequency-conversion air conditioner
CN102353120A (en) * 2011-08-31 2012-02-15 宁波奥克斯电气有限公司 Control method for preventing refrigerant partial flowing in refrigeration of multi-connection-type air-conditioning unit
CN102353120B (en) * 2011-08-31 2013-08-07 宁波奥克斯电气有限公司 Control method for preventing refrigerant partial flowing in refrigeration of multi-connection-type air-conditioning unit
CN105865096A (en) * 2016-04-29 2016-08-17 宁波奥克斯电气股份有限公司 Method and unit for improving heating effect of multi-connected machine set

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