KR101908307B1 - Refrigeration system - Google Patents

Refrigeration system Download PDF

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Publication number
KR101908307B1
KR101908307B1 KR1020160036621A KR20160036621A KR101908307B1 KR 101908307 B1 KR101908307 B1 KR 101908307B1 KR 1020160036621 A KR1020160036621 A KR 1020160036621A KR 20160036621 A KR20160036621 A KR 20160036621A KR 101908307 B1 KR101908307 B1 KR 101908307B1
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South Korea
Prior art keywords
refrigerant
heat exchanger
oil recovery
during
compressor
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KR1020160036621A
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Korean (ko)
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KR20170111345A (en
Inventor
유윤호
최재혁
류병진
김경록
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엘지전자 주식회사
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Priority to KR1020160036621A priority Critical patent/KR101908307B1/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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • 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
    • F25B31/00—Compressor arrangements
    • F25B41/003—
    • F25B41/062—
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—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
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves

Abstract

본 발명은 냉장시스템에 관한 것이다. 본 발명의 실시예에 따른 냉장시스템은, 냉매를 압축하는 압축기와, 냉장운전시 상기 압축기에서 압축된 냉매를 응축하는 실외 열교환기와, 상기 냉장운전시 냉매를 증발하고 오일회수운전시 냉매를 응축하는 냉장 열교환기와, 상기 오일회수운전시 상기 압축기에서 압축된 냉매와 상기 냉장 열교환기에서 응축된 냉매를 열교환하는 오일회수 열교환기와, 상기 냉장운전시 상기 압축기에서 압축된 냉매를 상기 실외 열교환기로 안내하고 상기 오일회수운전시 상기 압축기에서 압축된 냉매를 상기 오일회수 열교환기로 안내하는 절환유닛을 포함한다.The present invention relates to a refrigeration system. The refrigerating system according to an embodiment of the present invention includes a compressor for compressing refrigerant, an outdoor heat exchanger for condensing the refrigerant compressed in the compressor during refrigerating operation, and a condenser for evaporating the refrigerant during the refrigerating operation and condensing the refrigerant during the oil recovery operation An oil recovery heat exchanger for exchanging heat between a refrigerant compressed in the compressor and refrigerant condensed in the refrigerating heat exchanger during the oil recovery operation, and an oil recovery heat exchanger for guiding the refrigerant compressed in the compressor to the outdoor heat exchanger during the refrigeration operation, And a switching unit for guiding the refrigerant compressed in the compressor to the oil recovery heat exchanger in the oil recovery operation.

Description

냉장시스템 {Refrigeration system}Refrigeration system

본 발명은 냉장시스템에 관한 것으로, 보다 상세하게는 오일 회수가 원활하게 이루어지는 냉장시스템에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system, and more particularly, to a refrigeration system in which oil recovery is smoothly performed.

냉장시스템은 압축기, 응축기, 팽창기 및 증발기로 이루어진 냉동사이클을 이용하여 냉장고 또는 쇼케이스의 고내 온도를 저온으로 유지시키는 장치이다.The refrigeration system is a device for keeping the internal temperature of a refrigerator or a showcase at a low temperature by using a refrigeration cycle including a compressor, a condenser, an inflator and an evaporator.

냉장시스템은 상품을 보관하고 진열하는 냉장실내기와, 실외에 설치되어 냉장실내기와 냉매배관으로 연결되는 냉장실외기를 포함한다. 냉장실외기에는 압축기 및 응축기가 배치되고 냉장실내기에는 팽창기 및 증발기가 배치된다. 냉장시스템은 하나의 냉장실내기와 하나의 냉장실외기가 연결되어 구성될 수 있으나, 복수개의 냉장실내기와 냉장실외기의 조합으로 구성될 수도 있다.The refrigeration system includes a refrigerator compartment for storing and displaying commodities, and a refrigerated outdoor unit installed outside the refrigerator compartment and connected to a refrigerant pipe. A compressor and a condenser are disposed in the refrigerated outdoor unit, and an inflator and an evaporator are disposed in the refrigerated room. The refrigeration system may be configured by connecting one refrigerator compartment and one refrigerator compartment outdoor unit, but may be configured by a combination of a plurality of refrigerating room compartments and a refrigerating outdoor unit.

냉장실내기와 냉장실외기는 설치 조건에 따라 매우 긴 냉매배관으로 연결될 수 있으며 냉장실내기의 증발기에서 증발된 냉매가 유동되는 냉매배관인 기관에는 기상냉매가 유동됨에 따라 압축기 오일이 다량 잔류하여 압축기에 오일이 부족해지는 문제점이 있었다.The refrigerator compartment and refrigerated outdoor unit can be connected by a very long refrigerant piping depending on the installation conditions. The refrigerant piping which is evaporated in the evaporator of the refrigerating compartment flows into the refrigerant piping, and a large amount of the compressor oil remains due to the gaseous refrigerant flowing. There was a problem of becoming insufficient.

본 발명이 해결하고자 하는 과제는 오일 회수가 원활하게 이루어지는 냉장시스템을 제공하는 것이다.A problem to be solved by the present invention is to provide a refrigeration system in which oil recovery is smoothly performed.

본 발명의 과제들은 이상에서 언급한 과제들로 제한되지 않으며, 언급되지 않은 또 다른 과제들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

상기 과제를 달성하기 위하여, 본 발명의 실시예에 따른 냉장시스템은, 냉매를 압축하는 압축기와, 냉장운전시 상기 압축기에서 압축된 냉매를 응축하는 실외 열교환기와, 상기 냉장운전시 냉매를 증발하고 오일회수운전시 냉매를 응축하는 냉장 열교환기와, 상기 오일회수운전시 상기 압축기에서 압축된 냉매와 상기 냉장 열교환기에서 응축된 냉매를 열교환하는 오일회수 열교환기와, 상기 냉장운전시 상기 압축기에서 압축된 냉매를 상기 실외 열교환기로 안내하고 상기 오일회수운전시 상기 압축기에서 압축된 냉매를 상기 오일회수 열교환기로 안내하는 절환유닛을 포함한다.According to an aspect of the present invention, there is provided a refrigeration system comprising: a compressor for compressing a refrigerant; an outdoor heat exchanger for condensing the refrigerant compressed in the compressor during a refrigeration operation; An oil recovery heat exchanger for exchanging heat between the refrigerant compressed in the compressor and the refrigerant condensed in the refrigerant heat exchanger during the oil recovery operation, and an oil recovery heat exchanger for recovering the refrigerant compressed in the compressor during the refrigerating operation And a switching unit for guiding the refrigerant guided to the outdoor heat exchanger and the refrigerant compressed in the compressor during the oil recovery operation to the oil recovery heat exchanger.

기타 실시예들의 구체적인 사항들은 상세한 설명 및 도면들에 포함되어 있다.The details of other embodiments are included in the detailed description and drawings.

본 발명의 냉장시스템에 따르면 다음과 같은 효과가 하나 혹은 그 이상 있다.According to the refrigeration system of the present invention, one or more of the following effects can be obtained.

첫째,　냉장운전시 기상냉매가 유동하는 기관에 오일회수운전시 액상냉매가 유동하도록 하여 오일이 원활하게 회수되는 장점이 있다.First, there is an advantage that the liquid refrigerant flows during the oil recovery operation to the engine in which the gaseous refrigerant flows during refrigerating operation, thereby smoothly recovering the oil.

둘째,　오일회수운전시 압축기에서 압축된 냉매와 압축기로 유동되는 냉매를 열교환하여 사이클이 안정적으로 유지되는 장점도 있다.Second, there is an advantage that the cycle is stably maintained by exchanging heat between the refrigerant compressed in the compressor and the refrigerant flowing in the compressor during the oil recovery operation.

셋째,　오일회수운전시 냉매가 2차에 걸친 응축과 팽창으로 사이클이 안정적으로 유지되는 장점도 있다.Third, during the oil recovery operation, the refrigerant maintains a stable cycle due to condensation and expansion over the second stage.

넷째, 오일회수운전시 냉장 열교환기가 응축기로 작용하여도 응축된 후 팽창된 냉매가 유입되어 냉장 열교환기가 구비된 쇼케이스 또는 냉동고의 고내 온도가 과하게 높아지지 않는 장점도 있다.Fourth, even when the refrigerating heat exchanger functions as a condenser during the oil recovery operation, there is an advantage that the indoor temperature of the showcase or freezer equipped with the refrigerating heat exchanger is not excessively increased due to the inflow of the expanded refrigerant after condensation.

본 발명의 효과들은 이상에서 언급한 효과들로 제한되지 않으며, 언급되지 않은 또 다른 효과들은 청구범위의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

도 1은 본 발명의 일 실시예에 따른 냉장시스템에 대한 구성도이다.
도 2는 본 발명의 일 실시예에 따른 냉장시스템에 대한 블럭도이다.
도 3은 본 발명의 일 실시예에 따른 냉장시스템의 냉장운전시 냉매 흐름이 도시된 구성도이다.
도 4은 본 발명의 일 실시예에 따른 냉장시스템의 오일회수운전시 냉매 흐름이 도시된 구성도이다.
도 5는 본 발명의 일 실시예에 따른 냉장시스템의 오일회수운전시 압력-엔탈피 선도(Pressure-Enthalpy Diagram, 이하 P-h 선도)를 나타내는 도면이다.1 is a configuration diagram of a refrigeration system according to an embodiment of the present invention.
2 is a block diagram of a refrigeration system according to an embodiment of the present invention.
FIG. 3 is a block diagram illustrating a refrigerant flow during a refrigeration operation of a refrigeration system according to an embodiment of the present invention.
FIG. 4 is a view illustrating a refrigerant flow in an oil recovery operation of a refrigeration system according to an embodiment of the present invention.
5 is a view showing a pressure-enthalpy diagram (hereinafter referred to as Ph diagram) in the oil recovery operation of the refrigeration system according to an embodiment of the present invention.

본 발명의 이점 및 특징, 그리고 그것들을 달성하는 방법은 첨부되는 도면과 함께 상세하게 후술되어 있는 실시예들을 참조하면 명확해질 것이다. 그러나 본 발명은 이하에서 개시되는 실시예들에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 수 있으며, 단지 본 실시예들은 본 발명의 개시가 완전하도록 하고, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이며, 본 발명은 청구항의 범주에 의해 정의될 뿐이다. 명세서 전체에 걸쳐 동일 참조 부호는 동일 구성 요소를 지칭한다.BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

이하, 본 발명의 실시예들에 의하여 냉장시스템을 설명하기 위한 도면들을 참고하여 본 발명에 대해 설명하도록 한다.Hereinafter, the present invention will be described with reference to the drawings for explaining a refrigeration system according to embodiments of the present invention.

도 1은 본 발명의 일 실시예에 따른 냉장시스템에 대한 구성도이고, 도 2는 본 발명의 일 실시예에 따른 냉장시스템에 대한 블럭도이다.FIG. 1 is a configuration diagram of a refrigeration system according to an embodiment of the present invention, and FIG. 2 is a block diagram of a refrigeration system according to an embodiment of the present invention.

본 발명의 일 실시예에 따른 냉장시스템은, 냉매를 압축하는 압축기(110)와, 냉장운전시 압축기(110)에서 압축된 냉매를 응축하는 실외 열교환기(130)와, 냉장운전시 냉매를 증발하고 오일회수운전시 냉매를 응축하는 냉장 열교환기(120)와, 오일회수운전시 압축기(110)에서 압축된 냉매와 냉장 열교환기(120)에서 응축된 냉매를 열교환하는 오일회수 열교환기(140)와, 냉장운전시 압축기(110)에서 압축된 냉매를 실외 열교환기(130)로 안내하고 오일회수운전시 압축기(110)에서 압축된 냉매를 오일회수 열교환기(140)로 안내하는 절환유닛(190)을 포함한다.The refrigerating system according to an embodiment of the present invention includes a compressor 110 for compressing a refrigerant, an outdoor heat exchanger 130 for condensing the refrigerant compressed by the compressor 110 during a refrigerating operation, An oil recovery heat exchanger 140 for exchanging heat between the refrigerant compressed in the compressor 110 and the refrigerant condensed in the refrigerant heat exchanger 120 during the oil recovery operation, a refrigerant heat exchanger 120 for condensing the refrigerant during the oil recovery operation, A switching unit 190 for guiding the refrigerant compressed in the compressor 110 to the outdoor heat exchanger 130 during the refrigerating operation and for guiding the refrigerant compressed in the compressor 110 to the oil recovery heat exchanger 140 during the oil recovery operation ).

압축기(110)는 유입되는 저온 저압의 냉매를 고온 고압의 냉매로 압축시킨다. 압축기(110)는 다양한 구조가 적용될 수 있으며, 실린더 및 피스톤을 이용한 왕복동 압축기 또는 선회 스크롤 및 고정 스크롤을 이용한 스크롤 압축기일 수 있다. 본 실시예에서 압축기(110)는 스크롤 압축기이다. 압축기(110)는 실시예에 따라 복수로 구비될 수 있다.The compressor 110 compresses the introduced low-temperature low-pressure refrigerant into high-temperature high-pressure refrigerant. The compressor 110 may have various structures, and may be a reciprocating compressor using a cylinder and a piston, or a scroll compressor using a revolving scroll and a fixed scroll. In this embodiment, the compressor 110 is a scroll compressor. The compressors 110 may be provided in plurality according to the embodiment.

압축기(110)는 냉장운전시 냉장 열교환기(120)에서 증발된 냉매가 유입되고, 오일회수운전시 오일회수 열교환기(140)에서 증발된 냉매가 유입된다.The refrigerant evaporated in the refrigerating heat exchanger (120) flows into the compressor (110) during refrigerating operation, and the refrigerant evaporated in the oil recovery heat exchanger (140) flows in the oil recovery operation.

본 실시예에서 냉장운전은 냉장 열교환기(120)에서 냉매를 증발하여 냉장 열교환기(120)가 구비된 쇼케이스 또는 냉동고의 고내 온도를 저온으로 유지하는 운전이고, 오일회수운전은 냉장 열교환기(120)에서 냉매를 응축하여 시스템 내(특히, 기관(174) 내)의 오일을 압축기(110)로 회수하는 운전이다.In the present embodiment, the refrigerating operation is an operation of evaporating the refrigerant in the refrigerating heat exchanger 120 to maintain the interior temperature of the showcase or the freezer provided with the refrigerating heat exchanger 120 at a low temperature. The oil recovering operation is performed in the refrigeration heat exchanger 120 (Particularly, in the engine 174) to the compressor 110. In this embodiment,

압축기(110)는 토출배관(171)에 의하여 절환유닛(190)과 연결되고, 흡입배관(176) 및 제 2 오일회수배관(178)에 의하여 오일회수 열교환기(140)에 연결되고, 흡입배관(176), 바이패스배관(175) 및 기관(174)에 의하여 냉장 열교환기(120)와 연결된다.The compressor 110 is connected to the switching unit 190 by the discharge pipe 171 and is connected to the oil recovery heat exchanger 140 by the suction pipe 176 and the second oil return pipe 178, The refrigeration heat exchanger 120 is connected to the refrigerant heat exchanger 120 by the heat exchanger 176, the bypass piping 175, and the engine 174.

절환유닛(190)은 냉장운전과 오일회수운전을 절환을 위한 유로 절환 밸브이다. 절환유닛(190)은, 냉장운전시 압축기(110)에서 압축된 냉매를 실외 열교환기(130)로 안내하고, 오일회수운전시 압축기(110)에서 압축된 냉매를 오일회수 열교환기(140)로 안내한다.The switching unit 190 is a flow path switching valve for switching between the refrigeration operation and the oil recovery operation. The switching unit 190 guides the refrigerant compressed in the compressor 110 during the refrigerating operation to the outdoor heat exchanger 130 and the refrigerant compressed in the compressor 110 during the oil recovery operation to the oil recovery heat exchanger 140 Guide.

절환유닛(190)은, 토출배관(171)에 의하여 압축기(110)와 연결되고, 실외유입배관(172)에 의하여 실외 열교환기(130)와 연결되고, 제 1 오일회수배관(177)에 의하여 오일회수 열교환기(140)와 연결된다.The switching unit 190 is connected to the compressor 110 by the discharge pipe 171 and is connected to the outdoor heat exchanger 130 by the outdoor inflow pipe 172 and is connected to the outdoor heat exchanger 130 by the first oil return pipe 177 And is connected to the oil recovery heat exchanger (140).

절환유닛(190)은, 냉장운전시 토출배관(171)와 실외유입배관(172)을 연결하고, 오일회수운전시 토출배관(171)와 제 1 오일회수배관(177)을 연결한다.The switching unit 190 connects the discharge pipe 171 and the outdoor inflow pipe 172 during the refrigerating operation and connects the discharge pipe 171 and the first oil return pipe 177 during the oil recovery operation.

절환유닛(190)은 서로 다른 유로를 연결할 수 있는 다양한 모듈로 구현될 수 있으며, 본 실시예에서는 삼방밸브이다. 실시예에 따라 절환유닛(190)은 사방밸브 또는 다양한 밸브 의 조합으로 구현될 수 있다.The switching unit 190 may be implemented by various modules capable of connecting different flow paths. In the present embodiment, the switching unit 190 is a three-way valve. Depending on the embodiment, the switching unit 190 may be implemented as a four-way valve or a combination of various valves.

실외 열교환기(130)는 냉장운전시 실외공기와 냉매를 열교환하고 오일회수운전시 냉매가 유동하지 않는다. 실외 열교환기(130)는 실외유입배관(172)에 의하여 절환유닛(190)과 연결되고 액관(173)에 의하여 냉장 팽창밸브(151)와 연결된다.The outdoor heat exchanger 130 exchanges heat between the outdoor air and the refrigerant during the refrigerating operation, and the refrigerant does not flow during the oil recovery operation. The outdoor heat exchanger 130 is connected to the switching unit 190 by the outdoor inflow pipe 172 and is connected to the refrigerant expansion valve 151 by the liquid pipe 173. [

냉장 팽창밸브(151)는 개도가 조절되어 냉장 열교환기(120)로 유입되는 냉매를 팽창한다. 냉장 팽창밸브(151)는 냉장운전시 실외 열교환기(130)에서 응축된 냉매를 팽창하고 오일회수운전시 오일회수 열교환기(140)에서 응축된 냉매를 팽창한다. 본 실시예에서 냉장 팽창밸브(151)는 감온팽창밸브(thermal expansion valve)인 것이 바람직하다.The refrigerating expansion valve (151) is opened to expand the refrigerant flowing into the refrigerating heat exchanger (120). The refrigerating expansion valve (151) expands the refrigerant condensed in the outdoor heat exchanger (130) during refrigerating operation and expands the refrigerant condensed in the oil recovery heat exchanger (140) during the oil recovery operation. In this embodiment, the cold storage expansion valve 151 is preferably a thermal expansion valve.

냉장 팽창밸브(151)는 액관(173)에 배치되어 실외 열교환기(130) 및 냉장 열교환기(120)와 연결된다. 냉장 팽창밸브(151)는 액관(173) 및 제 1 오일회수배관(177)을 통하여 오일회수 열교환기(140)와 연결된다. 냉장 팽창밸브(151)는 냉장 열교환기(120)와 함께 쇼케이스 또는 냉장고 내에 구비된다.The refrigerating expansion valve 151 is disposed in the liquid pipe 173 and connected to the outdoor heat exchanger 130 and the cold storage heat exchanger 120. The refrigerating expansion valve 151 is connected to the oil recovery heat exchanger 140 via the liquid pipe 173 and the first oil return pipe 177. The refrigerating expansion valve 151 is provided in the showcase or the refrigerator together with the refrigerating heat exchanger 120.

액관(173)에는 냉매의 유동을 조절하는 냉장밸브(161)가 배치될 수 있다. 냉장밸브(161)는 냉장 열교환기(120)와 냉장 팽창밸브(151)의 사이에 배치되어 냉장운전시 냉장 열교환기(120)가 설치된 쇼케이스 또는 냉동고의 고내 온도에 따라 개폐된다.The liquid pipe 173 may be provided with a refrigerating valve 161 for controlling the flow of the refrigerant. The refrigerating valve 161 is disposed between the refrigerating heat exchanger 120 and the refrigerating expansion valve 151 and is opened or closed in accordance with the internal temperature of the showcase or freezer installed in the refrigerating heat exchanger 120 during the refrigerating operation.

냉장 열교환기(120)는, 냉장운전시 실외 열교환기(130)에서 응축되어 냉장 팽창밸브(151)에서 팽창된 냉매를 증발하고, 오일회수운전시 오일회수 열교환기(140)에서 응축되어 냉장 팽창밸브(151)에서 팽창된 냉매를 다시 응축한다.The refrigerating heat exchanger 120 is condensed in the outdoor heat exchanger 130 to evaporate the refrigerant expanded in the refrigerating expansion valve 151 during the refrigerating operation and is condensed in the oil recovery heat exchanger 140 during the oil recovery operation, And the refrigerant expanded in the valve 151 is condensed again.

냉장 열교환기(120)는 액관(173)에 의하여 냉장 팽창밸브(151) 및 실외 열교환기(130)와 연결된다. 냉장 열교환기(120)는 액관(173) 및 제 1 오일회수배관(177)에 의하여 오일회수 열교환기(140)와 연결된다. 냉장 열교환기(120)는 기관(174) 및 제 2 오일회수배관(178)에 의하여 오일회수 팽창밸브(152)와 연결된다. 냉장 열교환기(120)는 기관(174) 및 바이패스배관(175)에 의하여 압축기(110)와 연결된다.The cold storage heat exchanger (120) is connected to the cold storage expansion valve (151) and the outdoor heat exchanger (130) by a liquid pipe (173). The cold storage heat exchanger (120) is connected to the oil recovery heat exchanger (140) by a liquid pipe (173) and a first oil return pipe (177). The cold storage heat exchanger 120 is connected to the oil recovery expansion valve 152 by the engine 174 and the second oil recovery pipe 178. The cold storage heat exchanger 120 is connected to the compressor 110 by the engine 174 and the bypass piping 175.

오일회수 열교환기(140)는 오일회수운전시 압축기(110)에서 압축된 냉매와 냉장 열교환기(120)에서 응축되어 오일회수 팽창밸브(152)에서 팽창된 냉매를 열교환한다. 오일회수 열교환기(140)는 냉장운전시 냉매가 유동하지 않는다. 오일회수운전시 오일회수 열교환기(140)는 압축기(110)에서 압축된 냉매를 응축하고 냉장 열교환기(120)에서 응축되어 오일회수 팽창밸브(152)에서 팽창된 냉매를 증발한다.The oil recovery heat exchanger 140 condenses the refrigerant compressed in the compressor 110 during the oil recovery operation and the refrigerant heat exchanger 120 to heat exchange the refrigerant expanded in the oil recovery expansion valve 152. The oil recovery heat exchanger 140 does not flow the refrigerant during the refrigerating operation. During the oil recovery operation, the oil recovery heat exchanger 140 condenses the refrigerant compressed in the compressor 110 and condensed in the refrigerant heat exchanger 120 to evaporate the refrigerant expanded in the oil recovery expansion valve 152.

오일회수 열교환기(140)는 제 1 오일회수배관(177)과 제 2 오일회수배관(178)이 관통하여 상호 열교환이 이루질 수 있도록 형성된다. 오일회수 열교환기(140)는 2중관 형태로 형성될 수 있다.The oil recovery heat exchanger 140 is formed so that the first oil recovery pipe 177 and the second oil recovery pipe 178 pass through each other and heat exchange can be performed. The oil recovery heat exchanger 140 may be formed in the form of a double pipe.

오일회수 열교환기(140)는, 제 1 오일회수배관(177)에 의하여 절환유닛(190)과 연결되고, 제 1 오일회수배관(177) 및 기관(174)에 의하여 냉장 팽창밸브(151)와 연결된다. 오일회수 열교환기(140)는, 제 2 오일회수배관(178) 및 흡입배관(176)에 의하여 압축기와 연결되고, 제 1 오일회수배관(177)에 의하여 오일회수 팽창밸브(152)와 연결된다.The oil recovery heat exchanger 140 is connected to the switching unit 190 by the first oil return pipe 177 and is connected to the refrigerant expansion valve 151 and the second oil return pipe 177 by the first oil return pipe 177 and the engine 174. [ . The oil recovery heat exchanger 140 is connected to the compressor by the second oil recovery pipe 178 and the suction pipe 176 and is connected to the oil recovery expansion valve 152 by the first oil recovery pipe 177 .

오일회수 팽창밸브(152)는 오일회수운전시 개도가 조절되어 냉장 열교환기(120)에서 응축되어 오일회수 열교환기(140)로 유입되는 냉매를 팽창한다. 오일회수 팽창밸브(152)는 냉장운전시 폐쇄된다. 본 실시예에서 오일회수 팽창밸브(152)는 전자팽창밸브(electronic expansion valve)인 것이 바람직하다.The oil recovery expansion valve 152 is opened in the oil recovery operation and is condensed in the cold storage heat exchanger 120 to expand the refrigerant flowing into the oil recovery heat exchanger 140. The oil recovery expansion valve 152 is closed during refrigeration operation. In this embodiment, the oil recovery expansion valve 152 is preferably an electronic expansion valve.

오일회수 팽창밸브(152)는 제 2 오일회수배관(178)에 배치되어 오일회수 열교환기(140)와 연결된다. 오일회수 팽창밸브(152)는 기관(174)에 의하여 냉장 열교환기(120)와 연결된다.The oil recovery expansion valve 152 is disposed in the second oil return pipe 178 and connected to the oil recovery heat exchanger 140. The oil recovery expansion valve 152 is connected to the cold storage heat exchanger 120 by an engine 174.

바이패스배관(175)은 냉장 열교환기(120)와 압축기(110)를 연결하여 냉장운전시 냉장 열교환기(120)에서 증발된 냉매를 압축기(110)로 안내한다. 바이패스배관(175)은 오일회수운전시 냉매가 유동하지 않는다. 바이패스배관은 기관(174)에 의하여 냉장 열교환기(120)와 연결되고 흡입배관(176)에 의하여 압축기(110)와 연결된다.The bypass piping 175 connects the refrigerant heat exchanger 120 and the compressor 110 and guides the refrigerant evaporated in the refrigerant heat exchanger 120 to the compressor 110 during refrigerating operation. The refrigerant does not flow during the oil recovery operation of the bypass piping (175). The bypass piping is connected to the cold storage heat exchanger 120 by the engine 174 and to the compressor 110 by the suction piping 176.

바이패스배관(175)에는 냉매의 유동을 조절하는 바이패스밸브(162)가 배치된다. 바이패스밸브(162)는 냉장운전시 개방되고 오일회수운전시 폐쇄된다.The bypass pipe 175 is provided with a bypass valve 162 for controlling the flow of the refrigerant. The bypass valve 162 is opened during the refrigeration operation and closed during the oil recovery operation.

기관(174)은 제 2 오일회수배관(178)과 바이패스배관(175)으로 분지되고, 제 2 오일회수배관(178)과 바이패스배관(175)은 흡입배관(176)으로 합지된다. 제 1 오일회수배관(177)은 일단이 절환유닛(190)과 연결되고 타단이 액관(173)과 연결된다.The engine 174 is branched to the second oil return pipe 178 and the bypass pipe 175 and the second oil return pipe 178 and the bypass pipe 175 are connected to the suction pipe 176. One end of the first oil return pipe 177 is connected to the switching unit 190 and the other end is connected to the liquid pipe 173. [

제어부(10)는 운전 모드에 따라 압축기(110), 절환유닛(190), 냉장 팽창밸브(151), 오일회수 팽창밸브(152), 냉장밸브(161) 및 바이패스밸브(162)를 제어한다.The control unit 10 controls the compressor 110, the switching unit 190, the refrigerant expansion valve 151, the oil recovery expansion valve 152, the refrigerating valve 161 and the bypass valve 162 in accordance with the operation mode .

냉장운전시 제어부(10)는 절환유닛(190)을 제어하여 토출배관(171)과 실외유입배관(172)을 연결한다. 냉장운전시 제어부(10)는 오일회수 팽창밸브(152)를 폐쇄하고 바이패스밸브(162)를 개방한다. 냉장운전시 제어부(10)는 냉장 팽창밸브(151)의 개도를 조절하고 쇼케이스 또는 냉동고의 고내 온도에 따라 냉장밸브(161)를 개폐한다.The control unit 10 controls the switching unit 190 to connect the discharge pipe 171 and the outdoor inflow pipe 172 during the refrigerating operation. The controller 10 closes the oil recovery expansion valve 152 and opens the bypass valve 162 during the refrigeration operation. The controller 10 adjusts the opening degree of the refrigerating expansion valve 151 and opens and closes the refrigerating valve 161 according to the indoor temperature of the showcase or the freezing machine.

오일회수운전시 제어부(10)는 절환유닛(190)을 제어하여 토출배관(171)과 제 1 오일회수배관(177)을 연결한다. 오일회수운전시 제어부(10)는 바이패스밸브(162)를 폐쇄하고 오일회수 팽창밸브(152)의 개도를 조절한다. 오일회수운전시 제어부(10)는 냉장밸브(161)를 개방하고 냉장 팽창밸브(151)의 개도를 조절한다.The control unit 10 controls the switching unit 190 to connect the discharge pipe 171 and the first oil return pipe 177 during the oil recovery operation. During the oil recovery operation, the control unit 10 closes the bypass valve 162 and regulates the opening of the oil recovery expansion valve 152. During the oil recovery operation, the control unit 10 opens the refrigerating valve 161 and adjusts the opening degree of the refrigerating expansion valve 151.

제어부(10)는 냉장운전시 압축기(110)의 오일 부족이 감지되면 오일회수운전을 수행한다.The control unit 10 performs the oil recovery operation when the oil shortage of the compressor 110 is detected during the refrigerating operation.

도 3은 본 발명의 일 실시예에 따른 냉장시스템의 냉장운전시 냉매 흐름이 도시된 구성도이다.FIG. 3 is a block diagram illustrating a refrigerant flow during a refrigeration operation of a refrigeration system according to an embodiment of the present invention.

냉장운전시 압축기(110)에서 압축된 냉매는 토출배관(171)을 통하여 절환유닛(190)으로 유동된다. 냉장운전시 절환유닛(190)은 토출배관(171)과 실외유입배관(172)을 연결하므로 절환유닛(190)으로 유동된 냉매는 실외유입배관(172)을 통하여 실외 열교환기(130)로 유입된다. 실외 열교환기(130)로 유입된 냉매는 실외공기와 열교환을 하여 응축된다.The refrigerant compressed in the compressor (110) during refrigerating operation flows to the switching unit (190) through the discharge pipe (171). The switching unit 190 connects the discharge pipe 171 and the outdoor inflow pipe 172 so that the refrigerant flowing into the switching unit 190 flows into the outdoor heat exchanger 130 through the outdoor inflow pipe 172 do. The refrigerant flowing into the outdoor heat exchanger 130 is heat-exchanged with the outdoor air and condensed.

냉장밸브(161)의 개방시 실외 열교환기(130)에서 응축된 냉매는 액관(173)을 통하여 냉장 팽창밸브(151)로 유동된다. 냉장 팽창밸브(151)로 유동된 냉매는 팽창된 후 냉장 열교환기(120)로 유동되어 증발한다. 냉장 열교환기(120)에서 냉매는 증발되어 쇼케이스 또는 냉동고의 고내 온도를 저온으로 유지시킨다. 냉장 열교환기(120)에서 증발된 냉매는 기관(174)으로 유동된다.The refrigerant condensed in the outdoor heat exchanger 130 flows to the refrigerant expansion valve 151 through the liquid pipe 173. [ The refrigerant flowing into the refrigerating expansion valve 151 is expanded and then flows into the refrigerating heat exchanger 120 and evaporates. In the cold storage heat exchanger (120), the refrigerant is evaporated to maintain the indoor temperature of the showcase or the freezer at a low temperature. The refrigerant evaporated in the cold storage heat exchanger 120 flows into the engine 174.

냉장운전시 기관(174)에는 냉장 열교환기(120)에서 증발된 기상냉매가 유동하므로 기관(174)이 길수록 기관(174)에는 다량의 오일이 잔류한다.The gaseous refrigerant evaporated in the refrigerating heat exchanger 120 flows into the engine 174 during the refrigerating operation, so that a large amount of oil remains in the engine 174 as the engine 174 is longer.

냉장운전시 오일회수 팽창밸브(152)는 폐쇄되고 바이패스밸브(162)는 개방되므로 기관(174)으로 유동된 냉매는 바이패스배관(175)을 통하여 흡입배관(176)으로 유동된다. 흡입배관(176)으로 유동된 냉매는 압축기(110)로 유입되어 압축된다.During refrigerating operation, the oil recovery expansion valve 152 is closed and the bypass valve 162 is opened, so that the refrigerant flowing into the engine 174 flows to the suction pipe 176 through the bypass pipe 175. The refrigerant flowing into the suction pipe 176 flows into the compressor 110 and is compressed.

도 4은 본 발명의 일 실시예에 따른 냉장시스템의 오일회수운전시 냉매 흐름이 도시된 구성도이고, 도 5는 본 발명의 일 실시예에 따른 냉장시스템의 오일회수운전시 P-h 선도를 나타내는 도면이다.FIG. 4 is a diagram illustrating a refrigerant flow in an oil recovery operation of a refrigeration system according to an embodiment of the present invention, FIG. 5 is a diagram illustrating a Ph diagram in an oil recovery operation of a refrigeration system according to an embodiment of the present invention to be.

오일회수운전시 압축기(110)에서 압축된 냉매는 토출배관(171)을 통하여 절환유닛(190)으로 유동된다. 압축기(110)에서 압축된 b 지점의 냉매는 고온고압의 상태가 된다. 압축기(110)에서 압축된 냉매는 냉장운전시보다 압력이 낮다. 즉, 오일회수운전시 압축기(110)는 낮은 운전속도 작동한다.During the oil recovery operation, the refrigerant compressed in the compressor (110) flows to the switching unit (190) through the discharge pipe (171). The refrigerant at point b compressed by the compressor 110 is in a state of high temperature and high pressure. The refrigerant compressed in the compressor 110 is lower in pressure than in the refrigerating operation. That is, in the oil recovery operation, the compressor 110 operates at a low operation speed.

오일회수운전시 절환유닛(190)은 토출배관(171)과 제 1 오일회수배관(177)을 연결하므로 절환유닛(190)으로 유동된 냉매는 제 1 오일회수배관(177)으로 유동된다. 제 1 오일회수배관(177)으로 유동된 냉매는 오일회수 열교환기(140)에서 열교환되어 응축된다. 오일회수 열교환기(140)는 제 1 오일회수배관(177)을 유동하는 냉매와 제 2 오일회수배관(178)을 유동하는 냉매를 상호 열교환다. 오일회수 열교환기(140)에서 응축된 c 지점의 냉매는 저온고압의 상태가 된다.The switching unit 190 connects the discharge pipe 171 and the first oil return pipe 177 during the oil recovery operation so that the refrigerant flowing into the switching unit 190 flows to the first oil return pipe 177. The refrigerant flowing into the first oil return pipe 177 is heat-exchanged in the oil recovery heat exchanger 140 and condensed. The oil recovery heat exchanger 140 exchanges heat between the refrigerant flowing through the first oil return pipe 177 and the refrigerant flowing through the second oil return pipe 178. The refrigerant at the point c condensed in the oil recovery heat exchanger 140 is in a state of low temperature and high pressure.

오일회수 열교환기(140)에서 응축된 냉매는 액관(173)을 통하여 냉장 팽창밸브(151)로 유동된다. 냉장 팽창밸브(151)로 유동된 냉매는 팽창된 후 냉장 열교환기(120)로 유동된다. 냉장 팽창밸브(151)에서 팽창된 d 지점의 냉매는 저온저압의 상태가 된다. 냉장 팽창밸브(151)에서 팽창된 냉매는 냉장운전시보가 압력이 높도록 냉장 팽창밸브(151)의 개도가 조절된다.The refrigerant condensed in the oil recovery heat exchanger (140) flows to the cold storage expansion valve (151) through the liquid pipe (173). The refrigerant that has flowed to the refrigerating expansion valve 151 is expanded and then flows to the refrigerating heat exchanger 120. The refrigerant at point d which is expanded at the refrigerating expansion valve 151 is in a state of low temperature and low pressure. The opening degree of the refrigerating expansion valve 151 is adjusted so that the pressure of the refrigerant expanded in the refrigerating expansion valve 151 is higher in the refrigerating operation time.

냉장 열교환기(120)로 유동된 냉매는 다시 응축된다. 냉장 열교환기(120)에서 응축되는 냉매는 저온상태이며 압력도 비교적 낮은 상태이므로 쇼케이스 또는 냉장고의 고내 온도를 크게 상승시키지 않는다. 냉장 열교환기(120)에서 응축된 냉매는 기관(174)으로 유동된다. 냉장 열교환기(120)에서 응축된 e 지점의 냉매는 온도가 더욱 하강한다.The refrigerant flowing to the cold storage heat exchanger 120 is condensed again. The refrigerant condensed in the cold storage heat exchanger 120 is in a low temperature state and the pressure is relatively low, so that the temperature of the inside of the showcase or the refrigerator is not greatly increased. The refrigerant condensed in the cold storage heat exchanger (120) flows into the engine (174). The refrigerant at the point e condensed in the cold storage heat exchanger 120 further falls in temperature.

오일회수운전시 기관(174)에는 냉장 열교환기(120)에서 응축된 액상냉매가 유동하므로 기관(174)에 잔류하는 오일은 액상냉매와 함께 오일회수 팽창밸브(152)로 유동된다.During the oil recovery operation, the liquid refrigerant condensed in the refrigerating heat exchanger 120 flows into the engine 174, so that the oil remaining in the engine 174 flows to the oil recovery expansion valve 152 together with the liquid refrigerant.

오일회수운전시 바이패스밸브(162)는 폐쇄되고 오일회수 팽창밸브(152)는 개도가 조절되므로 기관(174)으로 유동된 냉매는 제 2 오일회수배관(178)을 통하여 오일회수 팽창밸브(152)로 유동되어 다시 팽창된다. 오일회수 팽창밸브(152)에서 팽창된 f 지점의 냉매는 압력이 하강되어 저온저압의 상태가 된다.During the oil recovery operation, the bypass valve 162 is closed and the opening of the oil recovery expansion valve 152 is regulated. Therefore, the refrigerant flowing into the engine 174 flows through the second oil recovery pipe 178 to the oil recovery expansion valve 152 And then expanded again. The refrigerant at the point f which is expanded at the oil recovery expansion valve 152 is lowered to a state of low temperature and low pressure.

오일회수 팽창밸브(152)에서 팽창된 냉매는 오일회수 열교환기(140)로 유입된다. 오일회수 열교환기(140)로 유입된 냉매는 증발된 후 제 2 오일회수배관을 통하여 흡입배관(176)으로 유동된다. 오일회수 열교환기(140)에서 증발된 a 지점의 냉매는 압력을 유지하며 온도가 상승한다. 흡입배관(176)으로 유동된 냉매는 압축기(110)로 유입되어 압축된다.The refrigerant expanded at the oil recovery expansion valve (152) flows into the oil recovery heat exchanger (140). The refrigerant flowing into the oil recovery heat exchanger 140 is evaporated and then flows to the suction pipe 176 through the second oil recovery pipe. The refrigerant at the point a evaporated in the oil recovery heat exchanger 140 maintains the pressure and the temperature rises. The refrigerant flowing into the suction pipe 176 flows into the compressor 110 and is compressed.

이상에서는 본 발명의 바람직한 실시예에 대하여 도시하고 설명하였지만, 본 발명은 상술한 특정의 실시예에 한정되지 아니하며, 특허청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 다양한 변형실시가 가능한 것은 물론이고, 이러한 변형실시들은 본 발명의 기술적 사상이나 전망으로부터 개별적으로 이해되어서는 안될 것이다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

110: 압축기 120: 냉장 열교환기
130: 실외 열교환기 140: 오일회수 열교환기
151: 냉장 팽창밸브 152: 오일회수 팽창밸브
161: 냉장밸브 162: 바이패스밸브
173: 액관 174: 기관
177: 제 1 오일회수배관 178: 제 2 오일회수배관
190: 절환유닛110: compressor 120: cold storage heat exchanger
130: outdoor heat exchanger 140: oil recovery heat exchanger
151: Refrigerated expansion valve 152: Oil recovery expansion valve
161: refrigeration valve 162: bypass valve
173: Liquid pipe 174:
177: first oil return pipe 178: second oil return pipe
190: switching unit

Claims (6)

냉매를 압축하는 압축기;
냉장운전시 상기 압축기에서 압축된 냉매를 응축하는 실외 열교환기;
상기 냉장운전시 냉매를 증발하고 오일회수운전시 냉매를 응축하는 냉장 열교환기;
상기 오일회수운전시 상기 압축기에서 압축된 냉매와 상기 냉장 열교환기에서 응축된 냉매를 열교환하는 오일회수 열교환기; 및
상기 냉장운전시 상기 압축기에서 압축된 냉매를 상기 실외 열교환기로 안내하고 상기 오일회수운전시 상기 압축기에서 압축된 냉매를 상기 오일회수 열교환기로 안내하는 절환유닛을 포함하고,
상기 냉장 열교환기와 상기 압축기를 연결하여 상기 냉장운전시 상기 냉장 열교환기에서 증발된 냉매를 상기 압축기로 안내하는 바이패스배관을 더 포함하는 냉장시스템.A compressor for compressing the refrigerant;
An outdoor heat exchanger for condensing the refrigerant compressed in the compressor during refrigeration operation;
A refrigerant heat exchanger for evaporating the refrigerant during the refrigeration operation and for condensing the refrigerant during the oil recovery operation;
An oil recovery heat exchanger for exchanging heat between the refrigerant compressed in the compressor and the refrigerant condensed in the refrigerant heat exchanger during the oil recovery operation; And
And a switching unit for guiding the refrigerant compressed in the compressor to the outdoor heat exchanger during the refrigeration operation and for guiding the refrigerant compressed in the compressor to the oil recovery heat exchanger during the oil recovery operation,
Further comprising a bypass pipe connecting the refrigerant heat exchanger and the compressor to guide refrigerant evaporated in the refrigerant heat exchanger to the compressor during the refrigeration operation. 제 1 항에 있어서,
상기 냉장 열교환기로 유입되는 냉매를 팽창하는 냉장 팽창밸브; 및
상기 오일회수운전시 상기 냉장 열교환기에서 응축되어 상기 오일회수 열교환기로 유입되는 냉매를 팽창하는 오일회수 팽창밸브를 더 포함하는 냉장시스템.The method according to claim 1,
A refrigerant expansion valve for expanding the refrigerant flowing into the cold storage heat exchanger; And
Further comprising an oil recovery expansion valve for expanding the refrigerant condensed in the refrigerating heat exchanger and flowing into the oil recovery heat exchanger during the oil recovery operation. 제 2 항에 있어서,
상기 냉장 팽창밸브는 상기 냉장운전시 상기 실외 열교환기에서 응축된 냉매를 팽창하고 상기 오일회수운전시 상기 오일회수 열교환기에서 응축된 냉매를 팽창하는 냉장시스템.3. The method of claim 2,
Wherein the refrigerant expansion valve expands the refrigerant condensed in the outdoor heat exchanger during the refrigeration operation and expands the refrigerant condensed in the oil recovery heat exchanger during the oil recovery operation. 제 2 항에 있어서,
상기 오일회수 팽창밸브는 상기 냉장운전시 폐쇄되는 냉장시스템.3. The method of claim 2,
Wherein the oil recovery expansion valve is closed during the refrigeration operation. 삭제delete 제 1 항에 있어서,
상기 바이패스배관에 배치되어 냉매의 유동을 조절하는 바이패스밸브를 더 포함하고,
상기 바이패스밸브는 상기 냉장운전시 개방되고 상기 오일회수운전시 폐쇄되는 냉장시스템.The method according to claim 1,
Further comprising a bypass valve disposed in the bypass pipe for regulating the flow of the refrigerant,
Wherein the bypass valve is opened during the refrigeration operation and is closed during the oil recovery operation.
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