WO2018212983A1 - Système de réfrigération et évaporateur à film tombant - Google Patents

Système de réfrigération et évaporateur à film tombant Download PDF

Info

Publication number
WO2018212983A1
WO2018212983A1 PCT/US2018/030427 US2018030427W WO2018212983A1 WO 2018212983 A1 WO2018212983 A1 WO 2018212983A1 US 2018030427 W US2018030427 W US 2018030427W WO 2018212983 A1 WO2018212983 A1 WO 2018212983A1
Authority
WO
WIPO (PCT)
Prior art keywords
bypass
film evaporator
falling film
refrigeration system
housing
Prior art date
Application number
PCT/US2018/030427
Other languages
English (en)
Inventor
Junjie Guo
Original Assignee
Carrier Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corporation filed Critical Carrier Corporation
Priority to ES18724767T priority Critical patent/ES2952980T3/es
Priority to US16/614,991 priority patent/US20210164732A1/en
Priority to EP18724767.1A priority patent/EP3635310B1/fr
Publication of WO2018212983A1 publication Critical patent/WO2018212983A1/fr

Links

Classifications

    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • 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
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F25B39/028—Evaporators having distributing means
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
    • F28D5/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/02—Details of evaporators
    • F25B2339/021—Evaporators in which refrigerant is sprayed on a surface to be cooled
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/02—Details of evaporators
    • F25B2339/024—Evaporators with refrigerant in a vessel in which is situated a heat exchanger
    • F25B2339/0242—Evaporators with refrigerant in a vessel in which is situated a heat exchanger having tubular elements
    • 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
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/001—Ejectors not being used as compression device
    • F25B2341/0016—Ejectors for creating an oil recirculation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/0071—Evaporators

Definitions

  • the present invention relates to the refrigeration field, and in particular, to a refrigeration system having a falling film evaporator.
  • An objective of the present invention is to provide a refrigeration system and a falling film evaporator, to balance the thermodynamic property and the lubricating oil recovery effect of the refrigeration system having the falling film evaporator.
  • One aspect of the present invention provides a refrigeration system, comprising: a refrigeration loop having an air outlet of a compressor, a condenser, a throttle element, a falling film evaporator, and an air inlet of the compressor which are connected in sequence by pipes, wherein the falling film evaporator comprises a housing, a distributor located at an upper portion inside the housing, and a heat exchange pipeline located below the distributor; an oil return branch having an oil intake point connected to a lower portion of the falling film evaporator and an oil return point connected to the air inlet of the compressor; and a bypass branch having a bypass inlet connected to downstream of the throttle element and a bypass outlet connected to the lower portion of the falling film evaporator and used for introducing part of gas-liquid two-phase refrigerant into the falling film evaporator.
  • Another aspect of the present invention further provides a falling film evaporator, comprising: a housing; a distributor disposed at an upper portion inside the housing; a heat exchange pipeline disposed inside the housing and below the distributor; an oil intake point disposed at a lower portion of the falling film evaporator; and a bypass branch having a bypass inlet connected to the distributor and a bypass outlet connected to the lower portion of the falling film evaporator and used for introducing part of gas-liquid two-phase refrigerant into the lower portion of the falling film evaporator.
  • FIG. 1 is a schematic diagram of a falling film evaporator and an oil return loop according to the present invention.
  • FIG. 2 is a schematic diagram of a refrigeration system according to the present invention.
  • the refrigeration system comprises: a refrigeration loop 100 for realizing a main refrigeration function, an oil return branch 200 for providing a lubricating oil return to the compressor, and a bypass branch 300 according to the idea of the present invention.
  • the refrigeration loop 100 has an air outlet 110b of a compressor 110, an oil separator 150, a condenser 120, a throttle element 130, a falling film evaporator 140, and an air inlet 110a of the compressor 110 which are connected in sequence by pipes.
  • the falling film evaporator 140 comprises a housing 141, a distributor 142 located at an upper portion inside the housing 141, and a heat exchange pipeline 143 located below the distributor 142.
  • refrigerant after being compressed by the compressor 110, flows from the air outlet 110b into the condenser 120 for condensation, and is then throttled by the throttle element 130.
  • the throttled two-phase refrigerant enters the falling film evaporator 140.
  • the gas phase refrigerant will be directly sucked into the compressor 110.
  • the liquid phase refrigerant is distributed by the distributor 142, forms a refrigerant liquid film to flow through the heat exchange pipeline 143 inside the falling film evaporator 140, and exchanges heat with a to-be-cooled medium therein. After the heat exchange, the gas phase refrigerant obtained by evaporation is sucked into the compressor 110, to participate in a new working cycle.
  • the oil return branch 200 has an oil intake point 210 connected to a lower portion of the falling film evaporator 140 and an oil return point 220 connected to the air inlet 110a of the compressor 110.
  • part of lubricating oil that provides lubrication for the compressor 110 will enter the refrigeration cycle along with the flow of the refrigerant.
  • this part of lubricating oil that enters the refrigeration cycle can be sucked from the lower portion of the falling film evaporator 140 back into the compressor 110. Therefore, impact on both the heat exchange effect of the refrigerant and the lubrication effect of the compressor can be avoided.
  • the bypass branch 300 has a bypass inlet 320 connected to downstream of the throttle element 130 and a bypass outlet 310 connected to the lower portion of the falling film evaporator 140.
  • the bypass inlet 320 is disposed on or upstream of the distributor 142, and is used for introducing part of gas-liquid two-phase refrigerant into the falling film evaporator 140.
  • part of gas-liquid two- phase refrigerant downstream of the throttle element 130 will flow into the lower portion of the falling film evaporator 140 through the bypass branch 300, so that the refrigerant in the lower portion inside the housing 141 of the falling film evaporator reaches a preset liquid level.
  • the preset liquid level enables the liquid phase refrigerant to form a sufficiently large liquid level at the lower portion inside the housing 141 of the falling film evaporator, so that droplets of lubricating oil from above the falling film evaporator can substantially come into contact with the liquid level and be dissolved in the refrigerant.
  • Such a configuration makes it easier to suck most of the lubricating oil back to the compressor through the oil return branch, achieving an efficient oil return function.
  • the specific height value of the preset liquid level or the specific value of the area of the liquid level depends on various parameters such as a profile of the housing of the evaporator and a required oil return ratio.
  • the bypass inlet 320 is higher than the bypass outlet 310 in a vertical direction.
  • the gravity of the refrigerant caused by the height difference between the two can also be used as a power source for driving the bypass refrigerant to flow.
  • an auxiliary driving apparatus may be additionally disposed on the bypass branch 300, to provide more power to suck the two-phase refrigerant from the bypass inlet 320 to the bypass outlet 310.
  • the bypass branch 300 has a plurality of bypass inlets 320 and/or a plurality of bypass outlets 310.
  • the bypass inlets 320 and the bypass outlets 310 may belong to a same bypass branch, i.e., similar to the configuration of a liquid collector or liquid separator; or may belong to different bypass branches.
  • the falling film evaporator comprises a plurality of bypass branches 300, and each of the bypass branches may comprise at least one bypass inlet and/or bypass outlet.
  • the plurality of bypass outlets 310 can also be arranged in an evenly spaced manner on the lower portion of the housing 141 of the falling film evaporator. Thereby, the bypass refrigerant can be fed to the evaporator more evenly, thereby avoiding undue impact.
  • the bypass outlet 310 may be arranged at the bottom of the housing 141 of the falling film evaporator.
  • the refrigerant that enters the evaporator through the bypass outlet 310 basically does not unduly affect the original refrigerant liquid level in the evaporator, making the entire bypass process more stable.
  • a smallest flow cross-sectional area of a pipe of the bypass branch 300 is 0.5%-20% of a flow cross-sectional area of a pipe of the refrigeration loop 100 downstream of the throttle element 130.
  • the amount of the bypass refrigerant can meet the requirement for increasing the liquid level, and will not cause great impact to the normal cycle.
  • an unduly large amount of refrigerant accumulated in the housing of the falling film evaporator is not desirable in the present invention, because this has only a limited effect in improving the heat exchange efficiency and greatly increases the charging amount of the refrigerant as well as material costs. Therefore, the foregoing problem can be well resolved by limiting the flow area of the bypass branch to control the bypass flux, and a balance between efficiency and costs can be achieved.
  • a pipe of the bypass branch 300 has a circular and/or rectangular and/or trough-type cross-section, to adapt to different application scenarios and flow conditions.
  • bypass inlet of the bypass branch may further be connected to the distributor, though not shown in the figure.
  • the bypass branch can be considered to be part of the falling film evaporator.
  • the falling film evaporator comprises: a housing; a distributor disposed at an upper portion inside the housing; a heat exchange pipeline disposed inside the housing and below the distributor; an oil intake point disposed at a lower portion of the falling film evaporator; and a bypass branch having a bypass inlet connected to the distributor and a bypass outlet connected to the lower portion of the falling film evaporator and used for introducing part of gas-liquid two-phase refrigerant into the lower portion of the falling film evaporator, so that the refrigerant in the lower portion inside the housing of the falling film evaporator reaches a preset liquid level.
  • the preset liquid level enables the liquid phase refrigerant to form a sufficiently large liquid level at the lower portion inside the housing of the falling film evaporator, so that droplets of lubricating oil from above the falling film evaporator can substantially come into contact with the liquid level and be dissolved in the refrigerant, thereby achieving an efficient oil return function.
  • bypass branch is improved from multiple aspects, which will also be described one by one.
  • the bypass inlet is generally higher than the bypass outlet in a vertical direction.
  • the gravity of the refrigerant caused by the height difference between the two can also be used as a power source for driving the bypass refrigerant to flow.
  • an auxiliary driving apparatus may be additionally disposed on the bypass branch, to provide more power to suck the two-phase refrigerant from the bypass inlet to the bypass outlet.
  • the bypass branch has a plurality of bypass inlets and/or a plurality of bypass outlets.
  • the bypass inlets and the bypass outlets may belong to a same bypass branch, i.e., similar to the configuration of a liquid collector or liquid separator; or may belong to different bypass branches.
  • the falling film evaporator comprises a plurality of bypass branches, and each of the bypass branches may comprise at least one bypass inlet and/or bypass outlet.
  • the plurality of bypass outlets can also be arranged in an evenly spaced manner on the lower portion of the housing of the falling film evaporator. Thereby, the bypass refrigerant can be fed to the evaporator more evenly, thereby avoiding undue impact.
  • the bypass outlet may be arranged at the bottom of the housing of the falling film evaporator.
  • the refrigerant that enters the evaporator through the bypass outlet basically does not unduly affect the original refrigerant liquid level in the evaporator, making the entire bypass process more stable.
  • a pipe of the bypass branch has a circular and/or rectangular and/or trough-type cross-section, to adapt to different application scenarios and flow conditions.
  • the oil return branch 200 has a plurality of oil intake points 210.
  • the oil intake points 210 may belong to a same oil return branch, i.e., similar to the configuration of a liquid collector or liquid separator; or may belong to different oil return branches.
  • the refrigeration system comprises a plurality of oil return branches 200, and each of the oil return branches may comprise at least one oil intake point and/or oil return point.
  • a plurality of a plurality of oil intake points 210 can also be arranged in an evenly spaced manner on the lower portion of the housing 141 of the falling film evaporator. Thereby, the recovered lubricating oil can be sucked from the evaporator more evenly, thereby avoiding undue impact.
  • the oil intake point 210 may be arranged at the bottom of the housing 141 of the falling film evaporator.
  • the lubricating oil in the evaporator basically can all be recovered through the oil intake point 210, and the amount of lubricating oil accumulated in the evaporator will not be unduly large to affect the heat exchange performance of the evaporator and the lubrication performance of the compressor.
  • an ejector 230 may further be disposed on the oil return branch 200.
  • the ejector 230 has a first ejection inlet connected to the oil intake point 210, a second ejection inlet connected to an inlet side of the condenser 120, and an ejection outlet connected to the air inlet 110a of the compressor 110, to provides power for the oil return.
  • other oil return methods well known in the art can also be adopted according to different application scenarios.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Compressor (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

L'invention concerne un système de réfrigération et un évaporateur à film tombant. Le système de réfrigération comprend : une boucle de réfrigération ayant une sortie d'air d'un compresseur, un condenseur, un élément d'étranglement, un évaporateur à film tombant et une entrée d'air du compresseur qui sont reliées en séquence par des tuyaux, l'évaporateur à film tombant comprenant un boîtier, un distributeur situé au niveau d'une partie supérieure à l'intérieur du boîtier, et une conduite d'échange de chaleur située sous le distributeur; une branche de retour d'huile ayant un point d'admission d'huile relié à une partie inférieure de l'évaporateur à film tombant et un point de retour d'huile relié à l'entrée d'air du compresseur; et une branche de dérivation ayant une entrée de dérivation reliée à l'aval de l'élément d'étranglement et une sortie de dérivation reliée à la partie inférieure de l'évaporateur à film tombant et utilisée pour introduire une partie du réfrigérant biphasé gaz-liquide dans l'évaporateur à film tombant.
PCT/US2018/030427 2017-05-19 2018-05-01 Système de réfrigération et évaporateur à film tombant WO2018212983A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES18724767T ES2952980T3 (es) 2017-05-19 2018-05-01 Sistema de refrigeración y evaporador de película descendente
US16/614,991 US20210164732A1 (en) 2017-05-19 2018-05-01 Refrigeration system and fall film evaporator
EP18724767.1A EP3635310B1 (fr) 2017-05-19 2018-05-01 Système de réfrigération et évaporateur à film tombant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710357044.3A CN108954986B (zh) 2017-05-19 2017-05-19 制冷系统及降膜式蒸发器
CN201710357044.3 2017-05-19

Publications (1)

Publication Number Publication Date
WO2018212983A1 true WO2018212983A1 (fr) 2018-11-22

Family

ID=62165743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2018/030427 WO2018212983A1 (fr) 2017-05-19 2018-05-01 Système de réfrigération et évaporateur à film tombant

Country Status (5)

Country Link
US (1) US20210164732A1 (fr)
EP (1) EP3635310B1 (fr)
CN (1) CN108954986B (fr)
ES (1) ES2952980T3 (fr)
WO (1) WO2018212983A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113970198B (zh) * 2021-12-27 2022-03-18 顿汉布什(中国)工业有限公司 一种用于低压制冷系统降膜蒸发器的分配器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561987A (en) * 1995-05-25 1996-10-08 American Standard Inc. Falling film evaporator with vapor-liquid separator
US5761914A (en) * 1997-02-18 1998-06-09 American Standard Inc. Oil return from evaporator to compressor in a refrigeration system
US20110023515A1 (en) * 2009-07-31 2011-02-03 Johnson Controls Technology Company Refrigerant control system and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9523523B2 (en) * 2012-10-16 2016-12-20 Trane International Inc. System and method for managing fluid level in a HVAC system
CN203132193U (zh) * 2013-01-07 2013-08-14 南京五洲制冷集团有限公司 一种降膜式螺杆冷水机组
CN103727707A (zh) * 2013-12-30 2014-04-16 麦克维尔空调制冷(武汉)有限公司 具有二重冷媒分配装置的全降膜式蒸发器
CN105387653B (zh) * 2015-12-21 2018-02-06 重庆美的通用制冷设备有限公司 蒸发器及具有其的冷水机组

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561987A (en) * 1995-05-25 1996-10-08 American Standard Inc. Falling film evaporator with vapor-liquid separator
US5761914A (en) * 1997-02-18 1998-06-09 American Standard Inc. Oil return from evaporator to compressor in a refrigeration system
US20110023515A1 (en) * 2009-07-31 2011-02-03 Johnson Controls Technology Company Refrigerant control system and method

Also Published As

Publication number Publication date
ES2952980T3 (es) 2023-11-07
US20210164732A1 (en) 2021-06-03
EP3635310A1 (fr) 2020-04-15
EP3635310B1 (fr) 2023-08-02
CN108954986A (zh) 2018-12-07
CN108954986B (zh) 2022-11-15

Similar Documents

Publication Publication Date Title
KR20090041848A (ko) 공기 조화기
EP2205909B1 (fr) Climatiseur
US4551989A (en) Oil equalization system for refrigeration compressors
CN103808070B (zh) 空调机
EP3635310B1 (fr) Système de réfrigération et évaporateur à film tombant
CN103574957A (zh) 多联机模块化系统
WO2015029204A1 (fr) Climatiseur
CN103038585B (zh) 制冷循环系统
CN102650479A (zh) 多联式空调机组及其油路系统
CN109945540B (zh) 水冷满液式双循环并联系统及其回油均衡方法
CN209371426U (zh) 一种动力热管多联空调一体机
CN109489294B (zh) 一种具有系统增焓多功能油分装置及其热泵系统
US10429109B2 (en) Refrigerant circuit and air-conditioning apparatus
CN103649653B (zh) 具有油补偿的制冷回路
CN203385240U (zh) 带有回油结构的变频多联机
CN101430151A (zh) 一种适用于多压缩机并联连接空调系统的气液分离器
CN202709314U (zh) 多联机模块化系统
CN103574958A (zh) 多联机模块化系统
CN201100799Y (zh) 适用于多压缩机并联连接空调系统的气液分离器
CN220083367U (zh) 用于压缩机的回油系统、换热系统及空调器
CN219693610U (zh) 一种高正落差空调被动回油系统及空调
CN203518346U (zh) 空调系统
CN217584815U (zh) 精密空调管道、精密空调的室外机以及精密空调
CN220507335U (zh) 用于换热系统的气液分离装置和换热系统
CN104567129B (zh) 空调系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18724767

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2018724767

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2018724767

Country of ref document: EP

Effective date: 20191219