KR100395436B1 - How to remove wet compression of air conditioners_ - Google Patents

How to remove wet compression of air conditioners_ Download PDF

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Publication number
KR100395436B1
KR100395436B1 KR10-1998-0050546A KR19980050546A KR100395436B1 KR 100395436 B1 KR100395436 B1 KR 100395436B1 KR 19980050546 A KR19980050546 A KR 19980050546A KR 100395436 B1 KR100395436 B1 KR 100395436B1
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KR
South Korea
Prior art keywords
compressor
refrigerant
temperature
air conditioner
wet compression
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KR10-1998-0050546A
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Korean (ko)
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KR20000033613A (en
Inventor
용 희 황
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주식회사 대우일렉트로닉스
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Priority to KR10-1998-0050546A priority Critical patent/KR100395436B1/en
Publication of KR20000033613A publication Critical patent/KR20000033613A/en
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Publication of KR100395436B1 publication Critical patent/KR100395436B1/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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • 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
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

Abstract

본 발명은 에어컨의 습압축 제거방법에 관한 것으로, 특히 에어컨이 구동되면 제1 및 제2 온도센서(20,30)를 통해 압축기로 유입되는 냉매의 온도(Tcomp)와 압축기에서 토출되는 냉매의 온도(Tdis)를 각각 검출하는 제 1 단계(101 내지 103)와, 상기 제 1 단계에서 검출된 냉매의 온도(Tcomp,Tdis)차가 기설정된 크기 보다 작으면 압축기(60)로 인가되는 전원 주파수를 감소시켜 압축기(60)를 저속으로 구동시키는 제 2 단계(104 내지 105)를 통해 압축기(60)에서 토출되는 냉매량을 저감시킨다. 이로인해, 공기로 부터의 열흡수량이 증가하여 냉매의 완전 기화가 이루어짐에 따라 습압축 현상은 제거된다.The present invention relates to a method of removing the wet compression of an air conditioner, and in particular, when the air conditioner is driven, the temperature (T comp ) of the refrigerant flowing into the compressor through the first and second temperature sensors 20 and 30 and the refrigerant discharged from the compressor. temperature (T dis) for the first stage (101 to 103) for detecting, respectively, and wherein the temperature of the detected refrigerant in step 1 (T comp, T dis) difference between groups is less than a predetermined magnitude is applied to the compressor 60 The amount of refrigerant discharged from the compressor 60 is reduced through the second steps 104 to 105 of driving the compressor 60 at a low speed by reducing the power source frequency. As a result, the amount of heat absorption from the air is increased to completely evaporate the refrigerant, thereby eliminating the wet compression phenomenon.

Description

에어컨의 습압축 제거방법 (A method for preventing to inflow liquid refrigerant into a compressor of air-conditioner)A method for preventing to inflow liquid refrigerant into a compressor of air-conditioner

본 발명은 에어컨의 습압축 제거방법에 관한 것으로, 특히 증발기에서 냉매를 완전히 기화시켜 액체와 기체의 혼합상태인 냉매가 압축기내로 유입됨으로 인해 발생되는 습압축 현상을 방지하는 에어컨의 습압축 제거방법에 관한 것이다.The present invention relates to a wet compression removal method of an air conditioner, and more particularly, to a wet compression removal method of an air conditioner which completely prevents a wet compression phenomenon caused by a refrigerant flowing into a compressor by completely evaporating a refrigerant in an evaporator. It is about.

일반적으로, 에어컨은 압축기, 응축기, 팽창밸브 및 증발기의 냉동사이클에 따른 냉매의 상변화를 이용하여 실내의 온도를 쾌적하게 유지하는 장치이다.In general, an air conditioner is a device that comfortably maintains a room temperature by using a phase change of a refrigerant according to a refrigeration cycle of a compressor, a condenser, an expansion valve, and an evaporator.

도 3은 상기와 같이 동작하는 에어컨의 일형태인 패키지 에어컨의 실내기를 나타낸 도면으로, 도 3a는 실내기의 정면도이고, 도 3b는 실내기의 측면도이다.3 is a view showing an indoor unit of a package air conditioner which is one type of air conditioner operating as described above, FIG. 3A is a front view of the indoor unit, and FIG. 3B is a side view of the indoor unit.

도면에 도시된 것처럼, 실내기(200)의 하부에는 실내공기를 흡입하는 흡입구(210)가 형성되어 있으며, 이 흡입구(210)의 내측에는 흡입된 실내공기를 열교환시켜 냉각시키는 증발기(250)가 장착되어 있고, 실내기(200)의 상부에는 증발기(250)에서 열교환된 냉기를 실내로 토출하는 토출구(220)가 형성되어 있다.As shown in the figure, an inlet 210 for suctioning indoor air is formed under the indoor unit 200, and an evaporator 250 is installed inside the suction port 210 to heat-exchange the sucked indoor air. The upper part of the indoor unit 200 has a discharge port 220 for discharging the cold air heat-exchanged by the evaporator 250 to the room.

또한, 실내기(200)의 내측 중앙에는 흡입구(210)를 통해 실내공기를 흡입하고 증발기(250)에서 열교환된 공기를 토출구(220)를 통해 실내로 토출하는 송풍팬(230)이 장착되어 있으며, 전면에는 사용자가 에어컨의 구동을 제어할 수 있도록 조작판(240)이 설치되어 있다.In addition, a blower fan 230 is installed at the inner center of the indoor unit 200 to suck the indoor air through the suction port 210 and discharge the air heat-exchanged in the evaporator 250 to the room through the discharge port 220. The operation panel 240 is installed on the front side so that the user can control the driving of the air conditioner.

한편, 도 4에 도시된 것처럼 실외기(300)의 베이스판(310) 일측에는 고압의 냉매가 갖고 있는 열을 흡수하여 냉매가스를 액화시키는 응축기(320)가 장착되어 있으며, 차단벽체(330)로 분리된 베이스판(310)의 타측에는 냉매를 압축하여 포화압력까지 냉매의 압력을 상승시켜 주는 압축기(340)가 장착되어 있다.Meanwhile, as shown in FIG. 4, one side of the base plate 310 of the outdoor unit 300 is equipped with a condenser 320 for absorbing heat contained in the high-pressure refrigerant to liquefy the refrigerant gas, and as a blocking wall 330. The other side of the separated base plate 310 is equipped with a compressor 340 for compressing the refrigerant to increase the pressure of the refrigerant to the saturation pressure.

또한, 냉매를 액화시키는 응축기(320)의 전방에는 냉각팬(350)이 장착되어 있는데, 이 냉각팬(350)은 응축기(320)에 결합되어 있는 지지브라켓(360)에 고정된 팬모터(도시안됨)의 회전축에 결합되어 있다.In addition, a cooling fan 350 is mounted to the front of the condenser 320 for liquefying the refrigerant, which cooling fan 350 is a fan motor fixed to the support bracket 360 coupled to the condenser 320. Is connected to the axis of rotation.

이와같이 구성된 에어컨을 구동시키면 송풍팬(230)이 회전하여 흡입구(210)를 통해 실내공기를 흡입하고, 이와같이 흡입된 실내공기는 냉동사이클에 따라 증발기(250)에서 열교환되어 토출구(220)를 통해 실내로 송풍된다.When the air conditioner configured as described above is driven, the blowing fan 230 rotates to suck the indoor air through the inlet 210, and the sucked indoor air is heat-exchanged in the evaporator 250 according to the refrigerating cycle, and the room is discharged through the outlet 220. Is blown into.

다시말해, 압축기(340)가 냉매를 압축하여 포화압력까지 냉매의 압력을 상승시켜 주면 응축기(320)는 고압의 냉매가 갖고 있는 열을 흡수하여 냉매를 액화시킨다. 이와같이 액화된 냉매는 팽창밸브(도시안됨)의 교축작용에 의해 압력이 낮아지고, 이 냉매가 증발기(250)에서 증발하면서 실내공기를 열교환시켜 실내온도를 쾌적하게 유지한다.In other words, when the compressor 340 compresses the refrigerant and increases the pressure of the refrigerant to the saturation pressure, the condenser 320 absorbs heat contained in the high pressure refrigerant to liquefy the refrigerant. The liquid liquefied in this way is lowered in pressure by the throttling action of the expansion valve (not shown), and the refrigerant is evaporated in the evaporator 250 to heat-exchange the indoor air to keep the room temperature comfortable.

그러나, 에어컨의 증발기(250)와 응축기(320)가 저온에서 구동되면 증발기(250)를 통해 압축기(340)로 유입되는 냉매가 기체상태가 아닌 액체와 기체의 혼합상태로 유입되어 습압축 현상이 발생하게 된다.However, when the evaporator 250 and the condenser 320 of the air conditioner are driven at a low temperature, the refrigerant flowing into the compressor 340 through the evaporator 250 is introduced into the mixed state of the liquid and the gas rather than the gaseous state, thereby causing a wet compression phenomenon. Will occur.

이와같이 습압축 현상이 발생하면 압축기(340)내의 압력이 과도하게 상승되고, 이로인해 베어링과 압축기구에 과도한 부하가 부가됨에 따라 압축기의 내구성은 저하되며, 또한 에어컨의 냉방능력도 저하될 뿐만 아니라 과도한 진동과 소음이 발생한다는 문제점이 있었다.As such, when the compression occurs, the pressure in the compressor 340 is excessively increased, and as a result, excessive load is applied to the bearings and the compression mechanism so that the durability of the compressor is lowered. There was a problem that vibration and noise occur.

이에 본 발명은 상기와 같은 문제점을 해결하기 위해 발명된 것으로, 냉매의 유동속도를 늦추어 증발기에서 냉매를 완전히 기화시킴에 따라 액체와 기체의 혼합상태인 냉매가 압축기내로 유입됨으로 인해 발생되는 습압축 현상을 방지할 수 있는 에어컨의 습압축 제거방법을 제공하는 것을 그 목적으로 한다.Accordingly, the present invention has been invented to solve the above problems, a wet compression phenomenon caused by the introduction of a refrigerant in a mixed state of liquid and gas into the compressor as the refrigerant is completely vaporized by slowing the flow rate of the refrigerant. It is an object of the present invention to provide a method for removing the wet compression of the air conditioner that can be prevented.

상기와 같은 목적을 달성하기 위하여 본 발명은, 에어컨의 제어방법에 있어서, 에어컨이 구동되면 제1 및 제2 온도센서를 통해 압축기로 유입되는 냉매의 온도와 압축기에서 토출되는 냉매의 온도를 각각 검출하는 제 1 단계와, 상기 제 1 단계에서 검출된 냉매의 온도차가 기설정된 크기 보다 작으면 압축기로 인가되는 전원 주파수를 감소시켜 압축기를 저속으로 구동시키는 제 2 단계를 구비하는 것을 특징으로 한다.In order to achieve the above object, the present invention, in the control method of the air conditioner, when the air conditioner is driven through the first and second temperature sensors to detect the temperature of the refrigerant flowing into the compressor and the temperature of the refrigerant discharged from the compressor, respectively And a second step of driving the compressor at a low speed by reducing the power frequency applied to the compressor when the temperature difference of the refrigerant detected in the first step is smaller than a predetermined size.

도 1은 본 발명이 적용되는 에어컨의 구성을 개략적으로 나타낸 블록도,1 is a block diagram schematically showing the configuration of an air conditioner to which the present invention is applied;

도 2는 본 발명에 따른 에어컨의 습압축 제거방법을 나타낸 흐름도,2 is a flow chart showing a method of removing the compression of the air conditioner according to the present invention;

도 3은 일반적인 패키지 에어컨의 실내기를 나타낸 도면으로,3 is a view showing the indoor unit of a typical package air conditioner,

도 3a는 실내기의 정면도,3a is a front view of an indoor unit;

도 3b는 실내기의 측면도,3B is a side view of the indoor unit,

도 4는 일반적인 분리형 에어컨의 실외기를 나타낸 도면.Figure 4 is a view showing the outdoor unit of a typical split type air conditioner.

도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings

10 : 운전스위치 20 : 제1 온도센서10: operation switch 20: the first temperature sensor

30 : 제2 온도센서 40 : 제어부30: second temperature sensor 40: control unit

50 : 압축기 구동부 60 : 압축기50: compressor drive unit 60: compressor

70 : RPM 검출부70: RPM detection unit

이하, 본 발명의 바람직한 일실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명이 적용되는 에어컨의 구성을 개략적으로 나타낸 블록도로, 에어컨을 구동하기 위한 운전스위치(10)가 제어부(40)에 접속되어 있으며, 또한 제어부(40)에는 압축기로 유입되는 냉매의 온도를 검출하는 제1 온도센서(20)와 압축기에서 토출되는 냉매의 온도를 검출하는 제2 온도센서(30)가 각각 접속되어 있다.1 is a block diagram schematically showing a configuration of an air conditioner to which the present invention is applied, and an operation switch 10 for driving the air conditioner is connected to the control unit 40, and the control unit 40 is configured to control the refrigerant flowing into the compressor. The first temperature sensor 20 for detecting the temperature and the second temperature sensor 30 for detecting the temperature of the refrigerant discharged from the compressor are respectively connected.

즉, 제1 온도센서(20)는 압축기의 저면에 부착되어 있으며 제2 온도센서(30)는 압축기와 응축기를 연결하는 배관의 소정위치에 장착되어 있는데, 제어부(40)는 상기된 온도센서(20,30)에서 검출되는 냉매의 온도차에 따라 압축기(60)를 저속으로 구동시켜 냉매의 토출량을 감소시킨다.That is, the first temperature sensor 20 is attached to the bottom of the compressor and the second temperature sensor 30 is mounted at a predetermined position of the pipe connecting the compressor and the condenser, the control unit 40 is the temperature sensor ( The compressor 60 is driven at a low speed according to the temperature difference of the refrigerant detected by 20 and 30 to reduce the discharge amount of the refrigerant.

다시말해, 제어부(40)의 출력신호에 따라 압축기 구동부(50)는 전원 주파수를 감소시켜 압축기(60)로 인가한다. 이로인해 압축기(60)의 전동기구가 저속으로 회전하는데, 이때 전동기구의 회전수는 RPM 검출부(70)를 통해 검출되어 제어부(40)로 인가된다.In other words, the compressor driver 50 reduces the power frequency and applies the compressor 60 to the compressor 60 according to the output signal of the controller 40. As a result, the power mechanism of the compressor 60 rotates at a low speed. At this time, the rotation speed of the power mechanism is detected by the RPM detection unit 70 and applied to the controller 40.

다음에는 상기와 같이 구성된 에어컨에 적용되는 본 발명에 따른 에어컨의 습압축 제거방법을 도 2를 참조하여 상세히 설명한다.Next, the method of removing the wet compression of the air conditioner according to the present invention applied to the air conditioner configured as described above will be described in detail with reference to FIG.

사용자가 운전스위치(10)를 스위칭하여 에어컨을 구동시키면(101), 제어부(40)는 제1 및 제2 온도센서(20,30)를 통해 압축기로 유입되는 냉매의 온도(Tcomp)와 압축기에서 토출되는 냉매의 온도(Tdis)를 각각 검출한다(102,103).When the user drives the air conditioner by switching the operation switch 10 (101), the control unit 40 and the compressor temperature (T comp ) of the refrigerant flowing into the compressor through the first and second temperature sensors (20, 30) The temperature T dis of the refrigerant discharged from the air is detected 102 and 103, respectively.

이와같이 검출된 냉매의 온도(Tcomp,Tdis)차가 6℃ 이내이면(104), 제어부(40)는 습압축을 방지하기 위하여 압축기(60)를 저속으로 구동시켜 압축기(60)에서 토출되는 냉매량을 저감시킨다(105). 다시말해, 압축기 구동부(50)를 제어하여 압축기(60)로 인가되는 전원의 주파수를 감소시킨다.When the difference of the detected temperature T comp , T dis is within 6 ° C. (104), the controller 40 drives the compressor 60 at a low speed to prevent wet compression so that the amount of refrigerant discharged from the compressor 60 is reduced. Reduce 105. In other words, the compressor driving unit 50 is controlled to reduce the frequency of the power applied to the compressor 60.

이렇게 압축기(60)로 인가되는 전원 주파수가 감소되면 압축기(60)의 전동기구가 저속으로 회전하고, 이로인해 압축기(80)의 냉매 토출량이 감소됨에 따라 냉매는 완전히 기체상태로 상변환된다.When the power source frequency applied to the compressor 60 is reduced in this way, the electric mechanism of the compressor 60 rotates at a low speed, and as a result, the refrigerant discharge amount of the compressor 80 is reduced, thereby completely converting the refrigerant into a gas state.

본 실시예는 실내를 냉방하는 에어컨에 대해서만 설명되어 있으나 실내를 난방하는 히트펌프에도 본 발명을 적용하여 습압축을 제거할 수 있다는 것은 당해 기술분야에서 통상의 지식을 지닌 자라면 충분히 이해할 것이다.Although the present embodiment is described only for the air conditioner for cooling the room, it will be fully understood by those skilled in the art that the present invention can be applied to the heat pump for heating the room to remove the wet compression.

상기와 같이 본 발명은, 냉매의 유동속도를 늦추어 증발기에서 냉매를 완전히 기화시킴에 따라 액체와 기체의 혼합상태인 냉매가 압축기내로 유입됨으로 인해 발생되는 습압축 현상을 방지할 수 있다.As described above, the present invention can prevent the wet compression phenomenon caused by the introduction of the refrigerant in a mixed state of the liquid and gas into the compressor as the refrigerant is completely vaporized by slowing the flow rate of the refrigerant.

본 발명은 도면에 도시된 일실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 당해 기술분야에 통상의 지식을 지닌 자라면 이로부터 다양한 변형 및 균등한 타실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호범위는 첨부된 특허청구범위에 의해서만 정해져야 할 것이다.Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (1)

에어컨의 제어방법에 있어서, 에어컨이 구동되면 제1 및 제2 온도센서(20, 30)를 통해 압축기로 유입되는 냉매의 온도(Tcomp)와 압축기에서 토출되는 냉매의 온도(Tdis)를 각각 검출하는 제 1 단계(101 내지 103)와, 상기 제 1 단계에서 검출된 냉매의 온도(Tcomp,Tdis)차가 기설정된 크기 보다 작으면 압축기(60)로 인가되는 전원 주파수를 감소시켜 압축기(60)를 저속으로 구동시키는 제 2 단계(104 내지 105)를 구비하는 것을 특징으로 하는 에어컨의 습압축 제거방법.In the control method of the air conditioner, the temperature (T comp ) of the refrigerant flowing into the compressor and the temperature (T dis ) of the refrigerant discharged from the compressor, respectively, when the air conditioner is driven through the first and second temperature sensors 20 and 30, respectively. If the difference between the first steps (101 to 103) and the temperature (T comp , T dis ) of the refrigerant detected in the first step is smaller than the predetermined size, the power source frequency applied to the compressor (60) is reduced to reduce the compressor ( 60) A second step (104 to 105) for driving at low speed.
KR10-1998-0050546A 1998-11-25 1998-11-25 How to remove wet compression of air conditioners_ KR100395436B1 (en)

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