KR100625567B1 - Air conditioner - Google Patents

Air conditioner Download PDF

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KR100625567B1
KR100625567B1 KR1020040091831A KR20040091831A KR100625567B1 KR 100625567 B1 KR100625567 B1 KR 100625567B1 KR 1020040091831 A KR1020040091831 A KR 1020040091831A KR 20040091831 A KR20040091831 A KR 20040091831A KR 100625567 B1 KR100625567 B1 KR 100625567B1
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South Korea
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expansion valve
outdoor
static pressure
electric expansion
indoor unit
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KR1020040091831A
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Korean (ko)
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KR20060044042A (en
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서무교
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삼성전자주식회사
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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
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • 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
    • F24F2140/20—Heat-exchange fluid temperature
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

본 발명은 공기조화기에 관한 것으로, 특히 본 발명은 실내기의 정압변화에 맞게 난방운전시, 실외전동팽창밸브의 개도량을 보상한다. 따라서, 본 발명은 실내기의 정압변화로 인한 풍향이 변동되더라도 실외열교환기에 유입되는 냉매순환량을 적정하게 유지시킬 수 있어 실외열교환기에 결빙이 발생하는 것을 방지한다.The present invention relates to an air conditioner, and in particular, the present invention compensates for the amount of opening of the outdoor electric expansion valve during heating operation according to the static pressure change of the indoor unit. Therefore, the present invention can properly maintain the refrigerant circulation flowing into the outdoor heat exchanger even if the wind direction is changed due to the static pressure change of the indoor unit, thereby preventing freezing from occurring in the outdoor heat exchanger.

이를 위해 본 발명은 난방운전시, 실외전동팽창밸브의 개도를 압축기의 현재토출온도와 미리 설정된 목표토출온도로부터 산출된 실외전동팽창밸브의 개도량에 따라 조절하는 공기조화기에 있어서, 실내기의 정압을 검출하는 정압검출부와, 이 정압검출부를 통해 검출된 실내기의 정압을 근거로 하여 실외전동팽창밸브의 개도량을 보상하기 위한 제어를 수행하는 제어부를 포함한다.To this end, the present invention is to control the positive pressure of the indoor unit in the air conditioner for controlling the opening degree of the outdoor electric expansion valve in accordance with the opening amount of the outdoor electric expansion valve calculated from the current discharge temperature and the predetermined target discharge temperature of the compressor during heating operation. And a controller for performing a control for compensating for the amount of opening of the outdoor electric expansion valve based on the static pressure of the indoor unit detected through the static pressure detection unit.

Description

공기조화기{AIR CONDITIONER}Air Conditioner {AIR CONDITIONER}

도 1은 본 발명에 따른 공기조화기의 냉매 사이클을 설명하기 위한 구성도이다.1 is a configuration diagram illustrating a refrigerant cycle of an air conditioner according to the present invention.

도 2는 본 발명에 따른 공기조화기의 제어블록도이다.2 is a control block diagram of an air conditioner according to the present invention.

도 3은 본 발명에 따른 공기조화기의 제어방법을 설명하기 위한 제어흐름도이다.3 is a control flowchart illustrating a control method of an air conditioner according to the present invention.

*도면의 주요 기능에 대한 부호의 설명** Description of the symbols for the main functions of the drawings *

10 : 압축기 11 : 4방향 밸브10 compressor 11 4-way valve

12 : 실외열교환기 13 : 전동팽창밸브12: outdoor heat exchanger 13: electric expansion valve

14 : 실내열교환기 15 : 어큐뮬레이터14: indoor heat exchanger 15: accumulator

16 : 흡입온도센서 17 : 토출온도센서16: suction temperature sensor 17: discharge temperature sensor

18 : 실외온도센서 19 : 실외열교환기배관온도센서18: Outdoor temperature sensor 19: Outdoor heat exchanger piping temperature sensor

20 : 실내온도센서 21 : 실내팬모터20: Indoor temperature sensor 21: Indoor fan motor

22 : 실외팬모터 30 : 제어부22: outdoor fan motor 30: control unit

31 : 실내제어기 32 : 실외제어기31: indoor controller 32: outdoor controller

본 발명은 공기조화기에 관한 것으로, 더욱 상세하게는 실내온도와 실외온도에 따른 압축기의 목표토출온도를 실외 전동팽창밸브의 개도로 제어하여 사이클을 최적상태로 하기 위한 공기조화기에 관한 것이다.The present invention relates to an air conditioner, and more particularly, to an air conditioner for optimizing a cycle by controlling a target discharge temperature of a compressor according to an indoor temperature and an outdoor temperature with an opening of an outdoor electric expansion valve.

일반적으로, 공기조화기는 실외기와 실내기를 포함한다. 실외기는 압축기, 4방향 밸브, 실외 열교환기, 그리고 실외 전동팽창밸브를 포함한다. 실내기는 실내 열교환기를 구비한다. 압축기, 4방향 밸브, 실외 열교환기, 실외전동팽창밸브 및 실내 열교환기는 사이클을 형성하도록 서로 연결되어 있으며, 실외전동팽창밸브는 실외 열교환기와 각 실내 열교환기 사이를 연결하는 냉매관에 마련되어 있다.In general, an air conditioner includes an outdoor unit and an indoor unit. The outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, and an outdoor electric expansion valve. The indoor unit has an indoor heat exchanger. The compressor, the four-way valve, the outdoor heat exchanger, the outdoor motor expansion valve, and the indoor heat exchanger are connected to each other to form a cycle, and the outdoor motor expansion valve is provided in the refrigerant pipe connecting the outdoor heat exchanger and each indoor heat exchanger.

공기조화기의 난방운전시, 압축기에서 토출된 고온고압의 냉매는 4방향 밸브, 실내 열교환기를 통과한 후 실외 열교환기로 들어가기 전에 실외 전동팽창밸브를 통과하게 된다. 이 실외 전동팽창밸브의 개도(출력스텝)는 예를 들면, 481스텝(0∼480)의 범위이며, 출력스텝 0은 전동팽창밸브의 개도를 완전 폐쇄한 상태이고, 출력스텝 480은 전동팽창밸브의 개도를 완전 개방한 상태이다.During the heating operation of the air conditioner, the high temperature and high pressure refrigerant discharged from the compressor passes through a four-way valve, an indoor heat exchanger, and then passes through an outdoor electric expansion valve before entering the outdoor heat exchanger. The opening degree (output step) of the outdoor electric expansion valve is, for example, in the range of 481 steps (0 to 480), the output step 0 is a state in which the opening degree of the electric expansion valve is completely closed, and the output step 480 is the electric expansion valve. The opening degree of is completely open.

이 실외 전동팽창밸브의 출력스텝은 다음 식 1에 기초하여 압축기의 현재토출온도와 목표토출온도로부터 정해진다.The output step of this outdoor electric expansion valve is determined from the present discharge temperature and the target discharge temperature of a compressor based on following formula (1).

출력스텝 = 편차*E + d편차*D -----(식 1)Output Step = Deviation * E + d Deviation * D ----- (Equation 1)

(여기서, 편차 = 압축기의 현재토출온도(T_dis) - 압축기의 목표토출온도(T_d_c)이고, d편차= 현재편차 - 전회편차이고, E, D는 상수이다)Where deviation = current discharge temperature of the compressor (T_dis)-target discharge temperature (T_d_c) of the compressor, d deviation = current deviation-previous deviation, and E and D are constants.

상기한 식 1에 의하여 산출되는 출력스텝으로 실외 전동팽창밸브의 개도를 조절하여 과열도를 제어한다.The superheat degree is controlled by adjusting the opening degree of the outdoor electric expansion valve by the output step calculated by Equation 1 above.

일반적으로, 실내기가 덕트형인 경우, 실내기의 정압이 표준정압보다 높거나 낮을 수 있다. 실내기의 정압이 표준정압보다 높을 경우, 풍량이 감소하여 응축압력이 상승하고, 실내기의 정압이 표준정압보다 낮을 경우, 풍량이 증가하여 응축압력이 감소한다. In general, when the indoor unit is a duct type, the static pressure of the indoor unit may be higher or lower than the standard static pressure. If the static pressure of the indoor unit is higher than the standard static pressure, the air volume decreases to increase the condensation pressure. If the static pressure of the indoor unit is lower than the standard static pressure, the air volume increases to decrease the condensation pressure.

그러나, 종래에는 실내기의 정압에 관계없이 압축기의 목표토출온도와 현재토출온도만을 이용하여 실외전동팽창밸브의 개도를 제어하기 때문에 실내기의 정압이 표준정압보다 높을 경우에는 표준정압상태에 비해 개도를 더 개방하여 냉매순환량을 증가시킨다. 이로 인해, 실외열교환기 출구측에 결빙이 발생하는 문제점이 있다.However, since the opening degree of the outdoor electric expansion valve is controlled by using only the target discharge temperature and the current discharge temperature of the compressor regardless of the static pressure of the indoor unit, when the static pressure of the indoor unit is higher than the standard static pressure, the opening degree is higher than the standard static pressure state. Open to increase the refrigerant circulation. As a result, there is a problem that freezing occurs at the outlet side of the outdoor heat exchanger.

한편, 실내기의 정압이 표준정압보다 낮을 경우에는 표준정압상태에 비해 개도를 더 폐쇄시켜 냉매순환량을 감소시킨다. 이로 인해, 실외열교환기 입구측에 결빙이 발생하는 문제점이 있다.On the other hand, when the static pressure of the indoor unit is lower than the standard static pressure, the opening degree is further closed compared to the standard static pressure state to reduce the refrigerant circulation amount. As a result, there is a problem that freezing occurs at the inlet side of the outdoor heat exchanger.

본 발명은 전술한 문제점을 해결하기 위한 것으로, 본 발명은 실내기의 정압변화에 맞게 난방운전시, 실외전동팽창밸브의 개도량을 보상하여 냉매순환량을 적정하게 유지시킴으로서 실외열교환기에 결빙이 발생하는 것을 방지할 수 있는 공기조화기를 제공하는 것이다.The present invention is to solve the above-described problems, the present invention is to compensate for the opening amount of the outdoor electric expansion valve during heating operation in accordance with the static pressure change of the indoor unit to maintain the refrigerant circulating amount properly to prevent freezing occurs in the outdoor heat exchanger It is to provide an air conditioner that can be prevented.

상기와 같은 목적을 달성하기 위하여 본 발명의 공기조화기는 압축기, 증발 기와, 실외전동팽창밸브를 구비한 실외기와, 응축기를 구비한 실내기를 포함하고, 난방운전시, 상기 실외전동팽창밸브의 개도를 상기 압축기의 현재토출온도와 미리 설정된 목표토출온도로부터 산출된 상기 실외전동팽창밸브의 개도량에 따라 조절하는 공기조화기에 있어서, 상기 실내기의 정압을 검출하는 정압검출부와, 상기 정압검출부를 통해 검출된 상기 실내기의 정압을 근거로 하여 상기 실외전동팽창밸브의 개도량을 보상하기 위한 제어를 수행하는 제어부를 포함한다.In order to achieve the above object, the air conditioner of the present invention includes a compressor, an evaporator, an outdoor unit having an outdoor electric expansion valve, and an indoor unit having a condenser. An air conditioner that adjusts according to the opening amount of the outdoor electric expansion valve calculated from a current discharge temperature and a predetermined target discharge temperature of the compressor, the air pressure detecting unit detecting the static pressure of the indoor unit, and detected through the positive pressure detecting unit. And a controller configured to perform a control for compensating the opening amount of the outdoor electric motor expansion valve based on the static pressure of the indoor unit.

상기 정압검출부는 상기 실외열교환기의 배관온도를 검출하는 배관온도센서와 상기 압축기의 흡입온도를 검출하는 흡입온도센서를 포함하고, 상기 검출된 배관온도와 흡입온도를 이용하여 상기 실내기의 정압을 검출하는 것을 특징으로 한다.The static pressure detection unit includes a pipe temperature sensor for detecting a pipe temperature of the outdoor heat exchanger and a suction temperature sensor for detecting a suction temperature of the compressor, and detects the static pressure of the indoor unit by using the detected pipe temperature and the suction temperature. Characterized in that.

상기 제어부는 상기 정압검출부를 통해 검출된 상기 실내기의 정압이 미리 설정된 표준정압보다 크면, 상기 실외전동팽창밸브의 개도량을 상기 표준정압상태에서의 상기 실외전동팽창밸브의 표준개도량보다 덜 열도록 보상하는 것을 특징으로 한다.The controller may open the opening amount of the outdoor electric expansion valve less than the standard opening amount of the outdoor electric expansion valve in the standard static pressure when the static pressure of the indoor unit detected by the positive pressure detecting unit is greater than a preset standard static pressure. It is characterized by compensating.

상기 제어부는 상기 정압검출부를 통해 검출된 상기 실내기의 정압이 미리 설정된 표준정압보다 적으면, 상기 실외전동팽창밸브의 개도량을 상기 표준정압상태에서의 상기 실외전동팽창밸브의 표준개도량보다 더 열도록 보상하는 것을 특징으로 한다.The controller is further configured to open an opening amount of the outdoor electric expansion valve more than a standard opening amount of the outdoor electric expansion valve in the standard static pressure state when the static pressure of the indoor unit detected by the positive pressure detecting unit is less than a preset standard static pressure. It is characterized in that to compensate.

상기 제어부는 상기 실외전동팽창밸브를 다음의 식에 의하여 산출된 출력스텝으로 개도시키는 것을 특징으로 한다.The controller may open the outdoor electric expansion valve to an output step calculated by the following equation.

출력스텝 = 편차*E + d편차*DOutput Step = Deviation * E + d Deviation * D

(여기서, 편차 = {T_dis+(T_suc-T_out_eap)*α} - T_d_c, d편차= 현재편차 - 전회편차이며, T_dis는 압축기의 현재토출온도, T_suc는 압축기의 흡입온도, T_out_eap는 실외열교환기의 배관온도, α는 보정계수, T_d_c는 목표토출온도, E와D는 상수이다)(Where deviation = {T_dis + (T_suc-T_out_eap) * α}-T_d_c, d deviation = current deviation-previous deviation, T_dis is the compressor's current discharge temperature, T_suc is the compressor's suction temperature, and T_out_eap is the piping of the outdoor heat exchanger. Temperature, α is the correction factor, T_d_c is the target discharge temperature, E and D are constants)

이하에서는 본 발명의 바람직한 실시예를 첨부도면을 참조하여 상세하게 설명하도록 한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

도 1에 도시된 바와 같이, 본 발명에 따른 공기조화기는 실외기(A)와 실내기(B)를 구비한다. 실외기(A)는 압축기(10), 4방향 밸브(11), 실외 열교환기(12), 실외전동팽창밸브(13), 어큐뮬레이터(15), 흡입온도센서(16) 및 토출온도센서(17)를 포함한다.As shown in Figure 1, the air conditioner according to the present invention includes an outdoor unit (A) and an indoor unit (B). The outdoor unit (A) includes a compressor (10), a four-way valve (11), an outdoor heat exchanger (12), an outdoor electric expansion valve (13), an accumulator (15), a suction temperature sensor (16), and a discharge temperature sensor (17). It includes.

압축기(10)의 토출측은 4방향 밸브(11)를 통해서 실외 열교환기(12)의 일측에 접속된다. 실외 열교환기(12)의 타측은 냉매관(W)에 접속된다. 냉배관(W)은 실내기(B)의 실내열교환기(14)에 연결된다. 그 실외열교환기(12)와 실내열교환기(14)사이의 냉매관(W)에는 실외전동팽창밸브(13)가 마련되어 있다. 이 실외전동팽창밸브(13)는 개도를 조절하여 실내열교환기(14)를 통과하여 실외열교환기(12)로 유입되는 냉매의 유량과 압력을 조절한다.The discharge side of the compressor 10 is connected to one side of the outdoor heat exchanger 12 via a four-way valve 11. The other side of the outdoor heat exchanger 12 is connected to the refrigerant pipe (W). Cold pipe (W) is connected to the indoor heat exchanger (14) of the indoor unit (B). The outdoor electric expansion valve 13 is provided in the refrigerant pipe W between the outdoor heat exchanger 12 and the indoor heat exchanger 14. The outdoor electric expansion valve 13 adjusts the flow rate and pressure of the refrigerant flowing into the outdoor heat exchanger 12 through the indoor heat exchanger 14 by adjusting the opening degree.

실내열교환기(14)의 출구는 냉매관(G)에 접속되며, 그 냉매관(G)은 4방향 밸브(11)와 어큐뮬레이터(15)를 통해 압축기(10)의 흡입측에 접속된다.The outlet of the indoor heat exchanger 14 is connected to the refrigerant pipe G, which is connected to the suction side of the compressor 10 via the four-way valve 11 and the accumulator 15.

흡입온도센서(16)는 압축기(10)에 흡입되는 냉매의 온도를 검출할 수 있도록 실외열교환기의 출구측과 압축기의 흡입측사이의 냉매관에 마련되고, 토출온도센서 (17)은 압축기(10)에서 토출되는 온도를 검출할 수 있도록 압축기(10)의 출구측와 4방향 밸브(11)를 연결하는 냉매관에 마련된다.The suction temperature sensor 16 is provided in the refrigerant pipe between the outlet side of the outdoor heat exchanger and the suction side of the compressor so as to detect the temperature of the refrigerant sucked into the compressor 10, and the discharge temperature sensor 17 is a compressor ( It is provided in the refrigerant pipe connecting the outlet side of the compressor 10 and the four-way valve 11 so that the temperature discharged from the 10) can be detected.

실외열교환기배관온도센서(18)는 실외열교환기(12)에 유입되는 냉매의 온도를 검출할 수 있도록 실외열교환기(12)의 배관에 마련된다.The outdoor heat exchanger pipe temperature sensor 18 is provided in the pipe of the outdoor heat exchanger 12 so as to detect the temperature of the refrigerant flowing into the outdoor heat exchanger 12.

또한, 실외열교환기(12)에는 실외온도를 검출하기 위한 실외온도센서(18)가 마련되고, 실내열교환기(14)에는 실내공기온도를 검출하기 위한 실내온도센서(20)가 마련된다.In addition, the outdoor heat exchanger 12 is provided with an outdoor temperature sensor 18 for detecting the outdoor temperature, and the indoor heat exchanger 14 is provided with an indoor temperature sensor 20 for detecting the indoor air temperature.

따라서, 난방운전시, 화살표와 같이, 압축기(10)에서 토출된 냉매는 4방향 밸브(11), 응축기로 작동하는 실내열교환기(14), 전동팽창밸브(13), 증발기로 작동하는 실외열교환기(12), 4방향 밸브(11)로 순환한다. 이에 따라, 실내를 난방시킨다. 미설명부호 21는 실내팬모터이고, 22는 실외팬모터이다.Therefore, during the heating operation, as shown by the arrow, the refrigerant discharged from the compressor 10 is the four-way valve 11, the indoor heat exchanger 14 acting as a condenser, the electric expansion valve 13, the outdoor heat exchange acting as an evaporator. 12, the four-way valve (11). Thus, the room is heated. Reference numeral 21 is an indoor fan motor, and 22 is an outdoor fan motor.

도 2는 본 발명에 따른 공기조화기의 제어블록도이다. 도 2에 도시된 바와 같이, 전반적인 제어를 수행하는 제어부(30)를 포함한다. 이 제어부(30)는 상호 통신 연결된 실내제어기(31)와 실외제어기(32)를 구비한다.2 is a control block diagram of an air conditioner according to the present invention. As shown in FIG. 2, the control unit 30 performs overall control. The controller 30 includes an indoor controller 31 and an outdoor controller 32 connected to each other.

실외제어기(32)는 마이크로컴퓨터와 그 주변회로를 포함하고, 실외기(A)의 전체적인 동작을 제어한다. 실외제어기(32)에는 입력측 또는 출력측에 전동팽창밸브(13), 4방향밸브(11), 실외팬모터(22), 흡입온도센서(16), 토출온도센서(17), 실외온도센서(18), 실외열교환기배관온도센서(19) 등이 접속되어 있다. 흡입온도센서(16)와 실외열교환기배관온도센서(19)는 실내기(B)의 정압을 검출하는 정압검출부를 사용되며, 흡입온도와 실외열교환기배관온도사이의 온도차에 표준정압에 상응하 는 온도범위보다 낮거나, 포함하거나, 높거나에 따라 실내기의 정압정도를 검출한다. 이러한 정압검출부는 흡입온도센서(16)와 실외열교환기배관온도센서(19)를 이용한 간접검출방식 대신에 실내기에 정압을 직접 검출할 수 있도록 마련된 정압센서를 이용하여서도 동일하게 검출할 수 있다.The outdoor controller 32 includes a microcomputer and its peripheral circuits, and controls the overall operation of the outdoor unit A. The outdoor controller 32 includes an electric expansion valve 13, a four-way valve 11, an outdoor fan motor 22, an intake temperature sensor 16, a discharge temperature sensor 17, and an outdoor temperature sensor 18 on an input side or an output side. ), An outdoor heat exchanger piping temperature sensor 19, and the like are connected. The suction temperature sensor 16 and the outdoor heat exchanger piping temperature sensor 19 use a positive pressure detector that detects the static pressure of the indoor unit B, and corresponds to the standard static pressure in the temperature difference between the suction temperature and the outdoor heat exchanger piping temperature. Detects the static pressure level of the indoor unit depending on whether it is lower, higher, or higher than the temperature range. The positive pressure detection unit may be detected in the same manner using a positive pressure sensor provided to directly detect the positive pressure in the indoor unit instead of the indirect detection method using the suction temperature sensor 16 and the outdoor heat exchanger pipe temperature sensor 19.

실내기(B)는 실내제어기(31)를 포함한다. 실내제어기(30)에는 마이크로컴퓨터와 그 주변회로를 포함하고, 실내기(B)의 전체적인 동작을 제어한다. 실내제어기(31)는 실내온도센서(19) 등이 접속되어 있다.The indoor unit B includes an indoor controller 31. The indoor controller 30 includes a microcomputer and its peripheral circuits, and controls the overall operation of the indoor unit B. The indoor controller 31 is connected to an indoor temperature sensor 19 or the like.

실외제어기(40)는 실내기제어기(31)로부터의 냉방모드 동작명령에 따라 압축기(10)에서 고온고압의 냉매를 실외열교환기(12)측으로 토출시켜 토출된 냉매가 4방향밸브(11), 실외열교환기(12), 전동팽창밸브(13), 실내열교환기(14), 4방향밸브(11)로 순환하도록 하여 실내를 냉방시킨다.The outdoor controller 40 discharges the refrigerant having a high temperature and high pressure from the compressor 10 to the outdoor heat exchanger 12 according to the cooling mode operation command from the indoor controller 31. The room is cooled by circulating through the heat exchanger 12, the electric expansion valve 13, the indoor heat exchanger 14, and the four-way valve 11.

또한, 실외제어기(40)는 실내기제어기(31)로부터의 난방모드 동작명령에 따라 압축기(10)에서 고온고압의 냉매를 실내열교환기(14)측으로 토출시켜 토출된 냉매가 4방향밸브(11), 실내열교환기(18), 전동팽창밸브(13), 실외열교환기(12), 4방향밸브(11)로 순환되도록 하여 실내를 난방시킨다.In addition, the outdoor controller 40 discharges the refrigerant having a high temperature and high pressure from the compressor 10 to the indoor heat exchanger 14 according to the heating mode operation command from the indoor controller 31, and the refrigerant discharged is the four-way valve 11. In order to circulate the indoor heat exchanger 18, the electric expansion valve 13, the outdoor heat exchanger 12, and the four-way valve 11, the room is heated.

실외제어기(40)는 전동팽창밸브(13)의 개도를 제어하여 실내기의 공조능력을 조절한다. 이때, 전동팽창밸브(13,14)의 개도는 일예로, 481스텝(0∼480)의 범위에서 제어한다. 여기서, 스텝 0은 전동팽창밸브의 완전폐쇄상태이고 스텝 480은 완전개방상태이다.The outdoor controller 40 controls the opening degree of the electric expansion valve 13 to adjust the air conditioning capacity of the indoor unit. At this time, the opening degree of the electric expansion valves 13 and 14 is controlled in the range of 481 steps (0 to 480) as an example. Here, step 0 is a fully closed state of the electric expansion valve and step 480 is a fully open state.

한편, 실외제어기(40)는 미리 설정된 압축기의 목표토출온도와 토출온도센서 (17)을 통하여 검출된 압축기(10)의 현재토출온도의 온도차에 기초하여 실외전동팽창밸브(13)의 개도량을 산출한다. 그리고, 실내기(B)의 정압정도를 고려하여 실외열교환기(12)로 유입되는 냉매순환량을 적정하게 유지시키도록 흡입온도센서(16)를 통하여 검출된 압축기(10)의 흡입온도와 실외열교환기배관온도센서(19)를 통하여 검출된 실외열교환기(12)의 배관온도사이의 온도차를 근거로 하여 실내기(B)의 정압정도를 판단한 후 이 판단결과를 근거로 하여, 산출된 실외전동팽창밸브(13)의 개도량을 증가, 유지, 감소시켜 표준정압상태에서의 적정 냉매순환량을 유지시킴으로서 실외전동팽창밸브(13)의 개도를 보상한다.Meanwhile, the outdoor controller 40 adjusts the opening amount of the outdoor electric expansion valve 13 based on a temperature difference between the target discharge temperature of the compressor and the current discharge temperature of the compressor 10 detected through the discharge temperature sensor 17. Calculate. In addition, the suction temperature of the compressor 10 and the outdoor heat exchanger detected by the suction temperature sensor 16 are maintained in consideration of the static pressure degree of the indoor unit B to properly maintain the refrigerant circulation flowed into the outdoor heat exchanger 12. Based on the temperature difference between the pipe temperatures of the outdoor heat exchanger 12 detected by the pipe temperature sensor 19, the static pressure degree of the indoor unit B is determined, and based on this determination result, the calculated outdoor electric expansion valve The opening degree of the outdoor electric expansion valve 13 is compensated by increasing, maintaining, and decreasing the opening amount of (13) to maintain an appropriate refrigerant circulation amount in a standard static pressure state.

좀더 구체적으로는 일예로서, 압축기의 현재토출온도, 압축기의 흡입온도, 실외열교환기의 배관온도를 검출한 후 다음의 식(2)를 이용하여 실외전동팽창밸브(13)의 개도량 즉, 출력스텝을 산출한다.More specifically, for example, after detecting the current discharge temperature of the compressor, the suction temperature of the compressor, the piping temperature of the outdoor heat exchanger, the opening amount of the outdoor electric expansion valve 13, that is, output using the following equation (2): Calculate the step.

출력스텝 = 편차*E + d편차*D-----(식2)Output Step = Deviation * E + d Deviation * D ----- (Equation 2)

(여기서, 편차 = {T_dis+(T_suc-T_out_eap)*α} - T_d_c, d편차= 현재편차 - 전회편차이며, T_dis는 압축기의 현재토출온도, T_suc는 압축기의 흡입온도, T_out_eap는 실외열교환기의 배관온도, α는 보정계수, T_d_c는 압축기의 목표토출온도, E와 D는 상수이다)(Where deviation = {T_dis + (T_suc-T_out_eap) * α}-T_d_c, d deviation = current deviation-previous deviation, T_dis is the compressor's current discharge temperature, T_suc is the compressor's suction temperature, and T_out_eap is the piping of the outdoor heat exchanger. Temperature, α is the correction factor, T_d_c is the target discharge temperature of the compressor, E and D are constant)

상기와 같이, 산출된 출력스텝으로 실외전동팽창밸브(13)의 개도를 조절하는 방식으로 개도를 보상함으로서 실외열교환기(12)로 유입되는 냉매순환량을 적정하게 유지시킬 수 있어 실외열교환기(12)에 결빙이 생기는 것을 방지할 수 있게 된다.As described above, the amount of refrigerant flowing into the outdoor heat exchanger 12 can be properly maintained by compensating for the opening degree by adjusting the opening degree of the outdoor electric expansion valve 13 by the calculated output step. ) Can prevent freezing.

이하에서는 본 발명에 따른 공기조화기에서 실내기의 정압변화에 의해 실외열교환기에 결빙이 발생하지 않도록 실외전동팽창밸브의 개도를 보상하는 과정을 설명한다.Hereinafter, a process of compensating for the opening degree of the outdoor electric expansion valve so that freezing does not occur in the outdoor heat exchanger due to the static pressure change of the indoor unit in the air conditioner according to the present invention.

도 3은 본 발명에 따른 공기조화기의 제어방법을 설명하기 위한 제어흐름도이다. 도 3을 참조하면, 먼저, 제어부(30)는 작동모드 S100에서 난방운전인지를 판단한다.3 is a control flowchart illustrating a control method of an air conditioner according to the present invention. Referring to FIG. 3, first, the controller 30 determines whether the heating operation is performed in the operation mode S100.

판단결과, 난방모드이면, 작동모드 S101에서 제어부(30)는 난방운전을 제어한다. 즉, 4방향밸브(11)를 난방모드로 전환시키고, 압축기(10)를 작동시켜 냉매를 고압고온으로 압축시킨 후 압축된 고온고압의 냉매를 실내열교환기(14)측으로 토출시킨다.As a result of the determination, in the heating mode, the control unit 30 controls the heating operation in the operation mode S101. That is, the four-way valve 11 is switched to the heating mode, the compressor 10 is operated to compress the refrigerant to high pressure and high temperature, and the compressed high temperature and high pressure refrigerant is discharged to the indoor heat exchanger 14 side.

그리고, 작동모드 S102에서 제어부(30)는 압축기의 토출온도센서(17)를 통해 압축기(10)의 현재토출온도를 검출한다. 작동모드 S103에서, 제어부(30)는 사이클에 맞게 최적으로 미리 설정된 압축기(10)의 목표토출온도와 작동모드 102에서 검출된 압축기(10)의 현재토출온도를 이용하여 실외전동팽창밸브(13)의 개도량을 산출한다.In operation mode S102, the controller 30 detects the current discharge temperature of the compressor 10 through the discharge temperature sensor 17 of the compressor. In the operation mode S103, the controller 30 uses the target discharge temperature of the compressor 10 optimally set in advance for the cycle and the current discharge temperature of the compressor 10 detected in the operation mode 102 to open the outdoor electric expansion valve 13. The opening amount of is calculated.

작동모드 S104 내지 작동모드 S107에서, 제어부(30)는 실내기(B)의 정압정도를 고려하여 실외열교환기(12)로 유입되는 냉매순환량을 적정하게 유지시키도록, 흡입온도센서(16)와 실외열교환기배관온도센서(19)를 통하여 각각 압축기(10)의 흡입온도와 실외열교환기(12)의 배관온도를 검출하고, 이 들사이의 온도차를 근거로 하여 실내기(B)의 정압정도를 판단한다.In the operation mode S104 to the operation mode S107, the control unit 30 takes into account the static pressure degree of the indoor unit B so as to properly maintain the refrigerant circulation flowed into the outdoor heat exchanger 12, so that the suction temperature sensor 16 and the outdoor The suction temperature of the compressor 10 and the piping temperature of the outdoor heat exchanger 12 are respectively detected through the heat exchanger piping temperature sensor 19, and the static pressure degree of the indoor unit B is determined based on the temperature difference therebetween. do.

작동모드 107에서의 판단결과, 온도차가 표준정압범위에 상응하는 온도범위보다 낮아 실내기의 정압이 저정압으로 판단되면, 제어부(30)는 단계 S108에서 단계 S103에서 산출된 실외전동팽창밸브(13)의 개도량을 보다 증가시켜 표준정압상태에서의 적정 개도량을 유지시킴으로서 실외열교환기의 입구측에 결빙이 발생하는 것을 방지할 수 있다.As a result of the determination in the operation mode 107, when the temperature difference is lower than the temperature range corresponding to the standard static pressure range and the static pressure of the indoor unit is determined as the low static pressure, the controller 30 determines the outdoor electric expansion valve 13 calculated in step S103 in step S108. It is possible to prevent the formation of freezing on the inlet side of the outdoor heat exchanger by maintaining the appropriate opening amount at the standard static pressure by further increasing the opening amount of.

또한, 작동모드 107에서의 판단결과, 온도차가 표준정압범위에 상응하는 온도범위에 포함되어 실내기의 정압이 표준정압으로 판단되면, 제어부는 단계 S109에서 단계 S103에서 산출된 실외전동팽창밸브(13)의 개도량을 현재상태로 유지시켜 적정 개도량을 유지시킨다.In addition, when it is determined in the operation mode 107 that the temperature difference is included in the temperature range corresponding to the standard static pressure range and the static pressure of the indoor unit is determined as the standard static pressure, the control unit determines the outdoor electric expansion valve 13 calculated in step S103 in step S109. The proper opening amount is maintained by keeping the opening amount of the current state.

한편, 작동모드 107에서의 판단결과, 온도차가 표준정압범위에 상응하는 온도범위보다 높아 실내기의 정압이 고정압으로 판단되면, 제어부(30)는 단계 S110에서 단계 S103에서 산출된 실외전동팽창밸브(13)의 개도량을 보다 감소시켜 표준정압상태에서의 적정 개도량을 유지시킴으로서 실외열교환기의 출구측에 결빙이 발생하는 것을 방지할 수 있다.On the other hand, if it is determined in the operation mode 107 that the temperature difference is higher than the temperature range corresponding to the standard static pressure range and the static pressure of the indoor unit is determined to be a fixed pressure, the controller 30 determines that the outdoor electric expansion valve ( It is possible to prevent the formation of freezing on the outlet side of the outdoor heat exchanger by maintaining the appropriate opening amount at the standard static pressure by further reducing the opening amount of 13).

그런 후 단계 S111에서, 제어부(30)는 단계 S108, S109 또는 S110에서 보상된 개도량으로 실외전동팽창밸브(13)의 개도를 조절한다.Then, in step S111, the controller 30 adjusts the opening degree of the outdoor electric expansion valve 13 by the opening amount compensated in step S108, S109 or S110.

이상에서 상세히 설명한 바와 같이, 본 발명은 실내기의 정압변화에 맞게 난방운전시, 실외전동팽창밸브의 개도량을 보상함으로서 실내기의 정압변화로 인한 풍향이 변동되더라도 실외열교환기에 유입되는 냉매순환량을 적정하게 유지시킬 수 있어 실외열교환기에 결빙이 발생하는 것을 방지할 수 있는 효과가 있다.As described in detail above, the present invention compensates the opening amount of the outdoor electric expansion valve during heating operation according to the static pressure change of the indoor unit, even if the wind direction is changed due to the static pressure change of the indoor unit, the amount of refrigerant circulating in the outdoor heat exchanger is properly adjusted. It can be maintained to prevent the occurrence of freezing in the outdoor heat exchanger.

Claims (5)

압축기, 증발기와, 실외전동팽창밸브를 구비한 실외기와, 응축기를 구비한 실내기를 포함하고, 난방운전시, 상기 실외전동팽창밸브의 개도를 상기 압축기의 현재토출온도와 미리 설정된 목표토출온도로부터 산출된 상기 실외전동팽창밸브의 개도량에 따라 조절하는 공기조화기에 있어서,A compressor, an evaporator, an outdoor unit having an outdoor electric expansion valve, and an indoor unit having a condenser, and during opening operation, the opening degree of the outdoor electric expansion valve is calculated from the current discharge temperature and a predetermined target discharge temperature of the compressor. In the air conditioner for adjusting according to the opening amount of the outdoor electric expansion valve, 상기 실내기의 정압을 검출하는 정압검출부와,A static pressure detector for detecting the static pressure of the indoor unit; 상기 정압검출부를 통해 검출된 상기 실내기의 정압을 근거로 하여 상기 실외전동팽창밸브의 개도량을 보상하기 위한 제어를 수행하는 제어부를 포함하는 공기조화기.And a control unit configured to perform a control for compensating for the opening amount of the outdoor electric motor expansion valve based on the static pressure of the indoor unit detected through the positive pressure detector. 제1항에 있어서, 상기 정압검출부는 상기 실외열교환기의 배관온도를 검출하는 배관온도센서와 상기 압축기의 흡입온도를 검출하는 흡입온도센서를 포함하고, 상기 검출된 배관온도와 흡입온도를 이용하여 상기 실내기의 정압을 검출하는 것을 특징으로 하는 공기조화기.According to claim 1, wherein the positive pressure detection unit includes a pipe temperature sensor for detecting the pipe temperature of the outdoor heat exchanger and the suction temperature sensor for detecting the suction temperature of the compressor, by using the detected pipe temperature and the suction temperature An air conditioner for detecting the static pressure of the indoor unit. 제1항에 있어서, 상기 제어부는 상기 정압검출부를 통해 검출된 상기 실내기의 정압이 미리 설정된 표준정압보다 크면, 상기 실외전동팽창밸브의 개도량을 상기 표준정압상태에서의 상기 실외전동팽창밸브의 표준개도량보다 덜 열도록 보상하는 것을 특징으로 하는 공기조화기.According to claim 1, wherein the control unit, if the static pressure of the indoor unit detected through the constant pressure detection unit is greater than a predetermined standard static pressure, the opening amount of the outdoor electric expansion valve is the standard of the outdoor electric expansion valve in the standard static pressure state An air conditioner, characterized in that to compensate for opening less than the opening amount. 제1항에 있어서, 상기 제어부는 상기 정압검출부를 통해 검출된 상기 실내기의 정압이 미리 설정된 표준정압보다 적으면, 상기 실외전동팽창밸브의 개도량을 상기 표준정압상태에서의 상기 실외전동팽창밸브의 표준개도량보다 더 열도록 보상하는 것을 특징으로 하는 공기조화기.The method of claim 1, wherein the control unit is further configured to set the opening degree of the outdoor electric expansion valve to the outside of the outdoor electric expansion valve when the positive pressure of the indoor unit detected by the positive pressure detection unit is less than a preset standard static pressure. An air conditioner, characterized in that to compensate for opening more than the standard opening amount. 제1항에 있어서, 상기 제어부는 상기 실외전동팽창밸브를 다음의 식에 의하여 산출된 출력스텝으로 개도시키는 것을 특징으로 하는 공기조화기.The air conditioner according to claim 1, wherein the control unit opens the outdoor electric expansion valve to an output step calculated by the following equation. 출력스텝 = 편차*E + d편차*DOutput Step = Deviation * E + d Deviation * D (여기서, 편차 = {T_dis+(T_suc-T_out_eap)*α} - T_d_c, d편차= 현재편차 - 전회편차이며, T_dis는 압축기의 현재토출온도, T_suc는 압축기의 흡입온도, T_out_eap는 실외열교환기의 배관온도, α는 보정계수, T_d_c는 목표토출온도, E와D는 상수이다)(Where deviation = {T_dis + (T_suc-T_out_eap) * α}-T_d_c, d deviation = current deviation-previous deviation, T_dis is the compressor's current discharge temperature, T_suc is the compressor's suction temperature, and T_out_eap is the piping of the outdoor heat exchanger. Temperature, α is the correction factor, T_d_c is the target discharge temperature, E and D are constants)
KR1020040091831A 2004-11-11 2004-11-11 Air conditioner KR100625567B1 (en)

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WO2010126329A3 (en) * 2009-05-01 2011-01-27 엘지전자 주식회사 Air conditioner and method for operating same

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CN114992803A (en) * 2022-05-30 2022-09-02 青岛海尔空调电子有限公司 Control method and device for air supply and enthalpy increase of heat pump air conditioner and heat pump air conditioner

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010126329A3 (en) * 2009-05-01 2011-01-27 엘지전자 주식회사 Air conditioner and method for operating same
US9109809B2 (en) 2009-05-01 2015-08-18 Lg Electronics Inc. Method of conditioning air with a refrigeration loop connected to a water circuit

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