KR20040086629A - Heat pump type refrigeration cycle - Google Patents

Heat pump type refrigeration cycle Download PDF

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Publication number
KR20040086629A
KR20040086629A KR1020030020954A KR20030020954A KR20040086629A KR 20040086629 A KR20040086629 A KR 20040086629A KR 1020030020954 A KR1020030020954 A KR 1020030020954A KR 20030020954 A KR20030020954 A KR 20030020954A KR 20040086629 A KR20040086629 A KR 20040086629A
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South Korea
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conduit
condenser
heat
evaporator
expansion valve
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KR1020030020954A
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Korean (ko)
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KR100586778B1 (en
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진금수
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진금수
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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
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
    • F25B41/40—Fluid line arrangements
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/28—Means for preventing liquid refrigerant entering into the compressor

Abstract

PURPOSE: A heat pump-type refrigerating cycle is provided to increase the emission heat of refrigerant in a condenser by supercooling high-temperature and high-pressure refrigerant liquid and to improve coefficient of performance by favorably vaporizing the refrigerant liquid and overheating refrigerant steam at an outlet of an evaporator. CONSTITUTION: A heat pump-type refrigerating cycle is composed of a basic refrigerating cycle(1) formed by connecting a compressor(2), a condenser(3), an expansion valve(4), and an evaporator(5) in order by conduits(6a,6b,6c,6d); a supercooling condenser(10) installed at the conduit; a heat exchanger for evaporation(11) disposed together with the expansion valve to keep a heat-exchanging relation with the supercooling condenser by connecting a bypass conduit(12) for bypassing the supercooling condenser and the expansion valve to the conduit; a second bypass conduit(14) linked to the conduit and an outlet of the heat exchanger for evaporation of the bypass conduit to bypass the evaporator; and a solenoid valve(16) disposed adjacent to a connection part of the conduit of the bypass conduit and an inlet of the second bypass conduit.

Description

히트 펌프식 냉동 사이클 {HEAT PUMP TYPE REFRIGERATION CYCLE}Heat Pump Refrigeration Cycle {HEAT PUMP TYPE REFRIGERATION CYCLE}

본 발명은 히트 펌프식 냉동 사이클에 관한 것이며, 상세하게는 히트 펌프식 냉동 사이클의 성적계수 향상 시스템에 관한 것이다.The present invention relates to a heat pump type refrigeration cycle, and more particularly, to a system for improving coefficient of performance of a heat pump type refrigeration cycle.

주지하는 바와 같이 히트 펌프식 냉동 사이클(1)은 도 1에서 참조되는 바와 같이 압축기(2), 응축기(3), 팽창밸브(4), 증발기(5)를 도관(6a~6d)으로 순서대로 연결한 것이다.As is well known, the heat pump type refrigeration cycle (1) is a compressor (2), condenser (3), expansion valve (4), evaporator (5) in order to the conduit (6a-6d) as shown in FIG. It is connected.

상기한 히트 펌프식 냉동 사이클은 압축기(2)에서 압축된 고온·고압의 냉매증기를 응축기(3)로 순환시켜 유체와 열교환될 때 그 응축열에 의하여 온수를 생성하거나 실내 공기를 가열하여서 난방 또는 건조기능 등을 수행하고, 상기 응축기(3)에서 응축된 고온·고압의 냉매액은 팽창밸브(4)에서 팽창시킨 후 증발기(5)에서 외기 또는 지하수 등의 열원으로 증발시켜 저온·저압의 냉매증기가 되게 한 후 압축기(2)에 흡입되는 사이클을 반복하는 것이다.The heat pump type refrigerating cycle circulates the high-temperature / high-pressure refrigerant vapor compressed by the compressor (2) to the condenser (3) to generate hot water by the heat of condensation or to heat or cool the room air when it is heat-exchanged with the fluid. The high temperature and high pressure refrigerant liquid condensed in the condenser 3 is expanded in the expansion valve 4 and then evaporated from the evaporator 5 to a heat source such as outside air or ground water to cool the steam at low temperature and low pressure. It is to repeat the cycle that is sucked into the compressor (2).

한편 상기 히트 펌프식 냉동 사이클은 P-h 선도로 도시하면 도 2와 같고, 상기 도 2에서 1→2는 팽창과정, 2→3은 증발과정, 3→4는 압축과정, 4→1은 응축과정으로서, 히트 펌프의 성적계수()는 아래식으로 표시되는 것이다.On the other hand, the heat pump type refrigeration cycle is shown in FIG. 2 as shown in FIG. 2, wherein 1 → 2 is an expansion process, 2 → 3 is an evaporation process, 3 → 4 is a compression process, and 4 → 1 is a condensation process. , Grade factor of heat pump ) Is represented by

그러나 상기한 히트 펌프식 냉동 사이클은 응축기(3)의 부하가 작아서 응축기(3)에서 고온·고압의 냉매증기의 응축이 불완전하여 냉매가 방출한 열량(q1)이 감소하거나 외기온도 또는 지하수 등의 온도가 낮아서 증발기(5)에서 냉매액의 증발이 저조하여 압축기(2)에 습증기가 흡입될 경우에는 압축기의 체적효율이 감소됨으로써 압축기의 일량(Aw)이 증가함으로써 성적계수가 저하되는 문제점이 발생하는 것이다.However, in the heat pump type refrigeration cycle, the load of the condenser 3 is small, and condensation of the high-temperature / high-pressure refrigerant vapor in the condenser 3 is incomplete, so that the amount of heat released by the coolant q 1 is reduced, When the vaporization of the refrigerant liquid in the evaporator 5 is low due to the low temperature of the vaporizer, the wet steam is sucked into the compressor 2, so that the volumetric efficiency of the compressor decreases, thereby increasing the work Aw. It happens.

또한 압축기(2)에 습증기가 흡입되면 액백(liquid back)이 일어남으로 압축기의 밸브를 손상시키는 원인이 되고, 액압축으로 인한 액격(liquid hammer)이 발생하는 경우가 있으며, 상기 액격이 원인이 되어 압축기가 손상되는 문제점도 발생하는 것이다.In addition, when wet steam is sucked into the compressor 2, liquid back may occur, causing damage to the valve of the compressor, and a liquid hammer may occur due to the liquid compression. The compressor is also damaged.

본 발명은 상기한 문제점을 시정하여, 모든 운전조건에서 냉매액을 과냉각함과 동시에 증발을 양호하게 하여 성적계수를 향상하고, 압축기의 신뢰성을 증진할 수 있도록 한 히트 펌프식 냉동 사이클을 제공하는 것을 목적으로 한다.The present invention is to provide a heat pump refrigeration cycle to correct the above problems, to improve the coefficient of performance and to improve the reliability of the compressor by supercooling the refrigerant liquid in all the operating conditions and at the same time good evaporation. The purpose.

상기한 목적을 달성하기 위하여, 본 발명은 압축기, 응축기, 팽창밸브 및 증발기를 도관(6a~6d)으로 순서대로 연결한 기본 냉동 사이클과; 상기 도관(6b)에 설치한 과냉응축기와; 상기 도관(6b)(6c)에 과냉응축기 및 팽창밸브를 바이패스하는 바이패스도관을 연결하여 상기 과냉응축기와 열교환 관계를 유지하도록 팽창밸브와 함께 설치한 증발용 열교환기로 구성한 것이다.In order to achieve the above object, the present invention comprises a basic refrigeration cycle connecting the compressor, the condenser, the expansion valve and the evaporator in order to the conduit (6a ~ 6d); A subcooled condenser installed in the conduit 6b; The conduit 6b, 6c is connected to a bypass conduit bypassing the supercooled condenser and the expansion valve, so that the evaporative heat exchanger is installed together with the expansion valve to maintain a heat exchange relationship with the supercooled condenser.

도 1은 본 발명의 실시예의 구성도.1 is a block diagram of an embodiment of the present invention.

도 2는 히트 펌프식 냉동 사이클의 P-h 선도.2 is a P-h diagram of a heat pump type refrigeration cycle.

<도면의 주요부분에 대한 부호 설명><Description of Signs of Major Parts of Drawings>

1 : 기본 냉동 사이클 3 : 응축기 5 : 증발기1: basic refrigeration cycle 3: condenser 5: evaporator

10 : 과냉응축기 11 : 증발용 열교환기 12 : 바이패스도관10: supercooled condenser 11: heat exchanger for evaporation 12: bypass conduit

14 : 제 2 바이패스도관14: second bypass conduit

도 1은 본 발명의 실시예의 구성도로서 부호 1은 기본 냉동 사이클로서, 상기 기본 냉동 사이클(1)은 압축기(2), 응축기(3), 팽창밸브(4), 증발기(5)를 도관(6a~6d)으로 순서대로 연결한 것으로서, 상기 응축기(3)는 그 응축열에 의하여 공기 또는 물을 가열하여 난방, 급탕 또는 건조기능 등을 수행하고, 상기 증발기(5)는 냉매액을 증발시킬 때 외기, 폐온수 또는 지하수 등을 열원으로 이용하는 것이다.1 is a block diagram of an embodiment of the present invention, the reference numeral 1 is a basic refrigeration cycle, the basic refrigeration cycle (1) is a conduit (compressor 2, condenser 3, expansion valve 4, evaporator 5) 6a to 6d), the condenser 3 heats air or water by the heat of condensation to perform a heating, hot water supply or drying function, and the evaporator 5 when evaporating the refrigerant liquid. Outside air, waste hot water or ground water is used as a heat source.

10은 과냉응축기로서, 상기 과냉응축기(10)는 상기 도관(6b)에 설치하여 응축기(3)에서 응축된 냉매액을 과냉각하여 그 응축열에 의하여 후술하는 증발용 열교환기(11)를 흐르는 냉매액의 증발을 촉진토록 한 것이다.10 denotes a subcooled condenser, wherein the subcooled condenser 10 is installed in the conduit 6b to supercool the refrigerant liquid condensed in the condenser 3 and flows through the evaporation heat exchanger 11 described later by the heat of condensation. To promote evaporation.

11은 증발용 열교환기로서, 상기 증발용 열교환기(11)는 도관(6b)과도관(6c)에 상기 과냉응축기(10) 및 팽창밸브(4)를 바이패스하는 바이패스도관(12)을 연결하여 상기 과냉응축기(10)와 열교환관계를 유지하도록 설치하고, 상기 증발용 열교환기(11)의 입구에는 팽창밸브(13)를 설치한 것이다.11 is an evaporating heat exchanger, and the evaporating heat exchanger 11 passes the bypass conduit 12 which bypasses the subcooled condenser 10 and the expansion valve 4 to the conduit 6b and the conduit 6c. It is installed to maintain a heat exchange relationship with the subcooling condenser 10 by connecting, and an expansion valve 13 is installed at the inlet of the heat exchanger 11 for evaporation.

그리고 본 발명은 바이패스도관(12)의 증발용 열교환기(11) 출구와 도관(6d)에 증발기(5)를 바이패스하는 제 2 바이패스도관(14)을 연결하고, 상기 제 2 바이패스도관(14)의 입구와 바이패스도관(12)의 도관(6c) 연결부 인접위치에 솔레노이드 밸브(15)(16)를 각각 설치하여 도관(6d)의 압축기(1)의 흡입위치에 설치한 온도센서(미도시)의 출력신호에 의하여 압축기(2)에 흡입되는 냉매증기의 온도가 설정치(예 18℃) 이상일 경우 즉 과열도가 클 경우에는 솔레노이드 밸브(15)를 개방하고 솔레노이드 밸브(16)는 폐쇄하며, 압축기(2)에 흡입되는 냉매증기의 온도가 설정치 이하일 때에는 상기의 반대로 개폐하는 것이다.The present invention connects a second bypass conduit 14 for bypassing the evaporator 5 to the evaporation heat exchanger 11 outlet of the bypass conduit 12 and the conduit 6d, and the second bypass conduit. The temperature at the suction position of the compressor 1 of the conduit 6d by installing solenoid valves 15 and 16 at positions adjacent to the inlet of the conduit 14 and the connection of the conduit 6c of the bypass conduit 12, respectively. When the temperature of the refrigerant vapor sucked into the compressor 2 by the output signal of the sensor (not shown) is higher than the set value (eg 18 ° C.), that is, when the superheat is large, the solenoid valve 15 is opened and the solenoid valve 16 is opened. Is closed, and when the temperature of the refrigerant vapor sucked into the compressor 2 is below the set value, the reverse is opened and closed.

이상과 같은 본 발명은 압축기(2)에서 압축된 고온·고압의 냉매증기를 응축기(3)에 순환 응축시켜 그 응축열을 유체와 열교환시킴으로써 온수를 생성하거나 실내공기를 가열하여 난방 또는 건조기능 등을 수행하고, 상기 응축기(3)에서 응축된 고온·고압의 냉매액의 일부는 과냉응축기(10)에서 과냉각된 후 팽창밸브(4)에서 팽창되고, 상기 응축기(3)에서 응축된 고온·고압의 냉매액의 일부는 바이패스도관(12)을 경유하여 팽창밸브(13)에서 팽창된 후 증발용 열교환기(11)에서 상기 과냉응축기(10)의 응축열에 의하여 증발하여 상기 팽창밸브(4)에서 팽창된 냉매액과 함께 증발기(5)에서 외기, 지하수 또는 폐온수 등의 열원에 의하여 증발되어 저온·저압의 냉매증기가 된 후 도관(6d)을 경유하여 압축기(2)에 흡입되는 사이클을반복하는 것이다.The present invention as described above circulates and condenses the high-temperature and high-pressure refrigerant vapor compressed by the compressor (2) to the condenser (3) to heat the condensation heat with the fluid to generate hot water or to heat the indoor air heating or drying function, etc. A portion of the high temperature and high pressure refrigerant liquid condensed in the condenser 3 is subcooled in the subcooler 10 and then expanded in the expansion valve 4, and the high temperature and high pressure condensed in the condenser 3 is performed. A portion of the refrigerant liquid is expanded in the expansion valve (13) via the bypass conduit (12) and then evaporated by the heat of condensation of the subcooler (10) in the evaporation heat exchanger (11). The evaporator 5 evaporates together with the expanded refrigerant liquid by a heat source such as outdoor air, ground water, or waste hot water to become a low-temperature / low-pressure refrigerant vapor, and then repeats the cycle of being sucked into the compressor 2 via the conduit 6d. It is.

상기와 같이 응축기(3)에서 응축된 고온·고압의 냉매액의 일부를 과냉응축기(10)에서 과냉각하여 포화온도 이하로 하면 응축기에서 냉매가 방출한 열량(q1)이 증가하고, 또한 상기 과냉각된 냉매액을 팽창밸브(4)에서 팽창하면 증발기(5) 입구에서 건도가 감소되고 압축기(2)의 동일한 압축일에 대하여 그 응축효과가 엔탄피차만큼 증가하며, 또한 과냉응축기(10)에서 고온·고압의 냉매액이 응축될 때 그 응축열을 증발용 열교환기(11)에 공급하여 냉매액의 증발을 양호하게 하면 증발기(5) 출구에서 냉매증기가 과열됨으로써 압축기에 공급한 일의 열당량(Aw)이 작아져서 성적계수를 향상시킬 수 있는 것이다.When a part of the refrigerant liquid in the high temperature and high pressure condensed in the condenser (3) below the saturation temperature by super-cooling in a sub-cooled condenser 10 increases the refrigerant discharged from the condenser heat quantity (q 1) as described above, and further wherein the super-cooling Expanding the refrigerant liquid in the expansion valve (4) reduces the dryness at the inlet of the evaporator (5) and increases the condensation effect by the enthalpy difference for the same compression day of the compressor (2), and also in the supercooled condenser (10) When the high-temperature and high-pressure refrigerant liquid is condensed, the heat of condensation is supplied to the evaporation heat exchanger 11 so that the evaporation of the refrigerant liquid is good. The smaller the Aw, the better the coefficient.

그리고 상기와 같이 운전될 때 압축기(2)에 흡입되는 냉매증기의 온도가 적정온도(예 18℃)이하일 때에는 흡입도관(6d)에 설치한 온도센서의 출력신호에 의하여 솔레노이드 밸브(15)는 폐쇄되고 솔레노이드 밸브(16)는 개방된 상태로 운전됨으로 증발용 열교환기(11)에서 증발된 냉매증기가 증발기(5)에서 재증발되어 압축기(2)에 흡입되는 냉매증기의 적정 과열도를 유지하지만 압축기(2)에 흡입되는 냉매증기의 온도가 설정치 이상이 되어 즉 적정 과열도 이상이 되면 압축기(2)에서 토출되는 냉매증기의 온도가 너무 높아짐으로 압축기에 손상을 초래하는 바, 이 경우에는 도관(6d)에 설치한 온도센서의 출력신호에 의하여 솔레노이드 밸브(15)는 개방되고 솔레노이드 밸브(16)는 폐쇄되어 증발용 열교환기(11)에서 증발된 저온·저압의 냉매증기는 증발기(5)를 경유하지 않고 직접 압축기(2)에 흡입되도록 하여적정 과열도를 유지할 수 있게 됨으로써 압축기(2)의 손상을 사전에 방지할 수 있는 것이다.When the temperature of the refrigerant vapor sucked into the compressor 2 when operating as described above is below the proper temperature (eg 18 ° C.), the solenoid valve 15 is closed by the output signal of the temperature sensor installed in the suction conduit 6d. And the solenoid valve 16 is operated in an open state so that the refrigerant vapor evaporated in the evaporation heat exchanger 11 is re-evaporated in the evaporator 5 to maintain an appropriate degree of superheat of the refrigerant vapor sucked into the compressor 2. If the temperature of the refrigerant vapor sucked into the compressor (2) is higher than the set value, that is, higher than the appropriate superheat degree, the temperature of the refrigerant vapor discharged from the compressor (2) becomes too high, which causes damage to the compressor. The solenoid valve 15 is opened and the solenoid valve 16 is closed by the output signal of the temperature sensor installed at 6d. The low temperature and low pressure refrigerant vapor evaporated in the evaporation heat exchanger 11 is evaporator 5 To Without oil to ensure that the intake directly the compressor (2) to maintain an appropriate degree of superheat is that by being able to avoid damage to the compressor (2) in advance.

이상과 같이 본 발명은 응축기에서 응축된 고온·고압의 냉매액을 과냉각하여 응축기에서 냉매의 방출열량을 증대하고, 또한 냉매액의 과냉각에 의하여 증발기에서의 증발효과를 엔탄피차만큼 증가함과 동시에 그 응축열을 증발용 열교환기에 공급하여 냉매액의 증발을 양호하게 하여 증발기 출구에서의 냉매증기를 과열함으로써 성적계수를 향상할 수 있고, 또한 응축기에서 응축된 고온·고압의 냉매액을 증발용 열교환기와 증발기에서 증발시킴으로써 습증기가 압축기에 흡입되는 것이 방지되어 압축기의 신뢰성을 증진시킬 수 있는 것이다.As described above, the present invention supercools the high-temperature and high-pressure refrigerant liquid condensed in the condenser to increase the amount of heat emitted from the refrigerant in the condenser, and also increases the evaporation effect in the evaporator by the enthalpy difference by the supercooling of the refrigerant liquid. The heat of condensation is supplied to the evaporation heat exchanger to improve the evaporation of the refrigerant liquid, thereby overheating the refrigerant vapor at the outlet of the evaporator, thereby improving the coefficient of performance. By evaporating in the evaporator, the moisture vapor is prevented from being sucked into the compressor, thereby improving the reliability of the compressor.

Claims (2)

압축기, 응축기, 팽창밸브 및 증발기를 도관(6a~6d)으로 순서대로 연결한 기본 냉동 사이클과; 상기 도관(6b)에 설치한 과냉응축기와; 상기 도관(6b)(6c)에 과냉응축기 및 팽창밸브를 바이패스하는 바이패스도관을 연결하여 상기 과냉응축기와 열교환 관계를 유지하도록 팽창밸브와 함께 설치한 증발용 열교환기로 구성한 히트 펌프식 냉동 사이클.A basic refrigeration cycle in which a compressor, a condenser, an expansion valve, and an evaporator are sequentially connected to conduits 6a to 6d; A subcooled condenser installed in the conduit 6b; And a bypass conduit for bypassing the supercooled condenser and the expansion valve to the conduits (6b) and (6c), the heat pump type refrigeration cycle comprising an evaporative heat exchanger installed together with the expansion valve to maintain a heat exchange relationship with the supercooled condenser. 제 1 항에 있어서, 바이패스도관의 증발용 열교환기 출구와 도관(6d)에 증발기를 바이패스하는 제 2 바이패스도관을 연결하고, 상기 제 2 바이패스도관의 입구와 바이패스도관의 도관(6c) 연결부 인접 위치에 솔레노이드 밸브를 각각 설치한 히트 펌프식 냉동 사이클.2. The conduit according to claim 1, wherein a second bypass conduit for bypassing the evaporator is connected to an evaporation heat exchanger outlet of the bypass conduit and a conduit 6d, and an inlet of the second bypass conduit and a conduit of the bypass conduit ( 6c) Heat pump type refrigeration cycle with solenoid valves installed adjacent to connections.
KR1020030020954A 2003-04-03 2003-04-03 Heat pump type refrigeration cycle KR100586778B1 (en)

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Publication number Priority date Publication date Assignee Title
CN113251699A (en) * 2021-05-12 2021-08-13 成都绿建工程技术有限公司 Heat recovery type heat pump oxygen-making air conditioning unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113251699A (en) * 2021-05-12 2021-08-13 成都绿建工程技术有限公司 Heat recovery type heat pump oxygen-making air conditioning unit

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