US3386262A - Refrigeration apparatus with compressors in parallel - Google Patents
Refrigeration apparatus with compressors in parallel Download PDFInfo
- Publication number
- US3386262A US3386262A US590744A US59074466A US3386262A US 3386262 A US3386262 A US 3386262A US 590744 A US590744 A US 590744A US 59074466 A US59074466 A US 59074466A US 3386262 A US3386262 A US 3386262A
- Authority
- US
- United States
- Prior art keywords
- refrigerant
- oil
- compressor
- compressors
- conduit
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- 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
-
- 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
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
Definitions
- ABSTRACT OF THE DISCLOSURE A refrigeration system having parallel circuited compressors in which means is provided for maintaining the oil Sump of one compressor at a higher pressure than the oil sump of the other compressor so that excess oil in the one compressor may fiow through an oil equalizer conduit to the other compressor; and means for directing a greater portion of the oil returned from the evaporator to the higher pressure oil sump.
- This invention relates to refrigeration apparatus of the compression cycle type using a plurality of compressors arranged in parallel in a closed refrigerant circuit. More particularly this invention relates to the problem of maintaining sufiicient oil in each of the compressors.
- a further object of the instant invention is to provide a refrigeration circuit for parallel compressors which does not depend upon the equalization of crankcase or oil sump pressures.
- Another object is to provide a refrigeration circuit for parallel compressors which requires no special oil pumping means for maintaining adequate lubricating oil in each of the compressors.
- Still another object of this invention is to provide a refrigeration circuit apparatus for parallel compressors which requires no special check valves to obtain adequate lubrication in each of the compressors.
- the instant invention specifically involves refrigeration apparatus comprising a refrigerant condenser means; a refrigerant evaporator means; first conduit means connecting the outlet of said refrigerant condenser means to the inlet of said refrigerant evaporator means; first and second refrigerant compressors; a first oil sump for said first refrigerant compressor; a second oil sump for said second refrigerant compressor; a first suction conduit connected to the inlet of said first refrigerant compressor and disposed in fluid communication with the outlet of said refrigerant evaporator means for conducting refrigerant from said refrigerant evaporator means to said first refrigerant compressor; a second suction conduit connected to the inlet of said second refrigerant compressor and disposed in fluid communication with the outlet of said refrigerant evaporator means for conducting refrigerant from said refrigerant evaporator means to said second refrigerant compressor; a discharge conduit means connecting the outlets of said first and second refrigerant compressor
- a refrigeration system It) for cooling a conditioned space 12 having a refrigerant condenser 14, a refrigerant receiver 16, a refrigerant throttling means such as thermal responsive expansion valve 18, a refrigerant evaporator 20 disposed in heat exchange relation with conditioned space 12, and a refrigerant compression mechanism 22 serially arranged in a closed refrigerant circuit.
- Compression mechanism 22 includes a first compressor 24 and a second compressor 26. Compressors 24 and 26 may be identical and a description of one will suflice for both.
- Compressor 24 has a hermetic casing 28. Disposed within casing 28 is a motor-compressor unit 30 which includes a motor portion 32 for driving a compress-or portion 34. Motor-compressor unit 30 is resiliently mounted within casing 28 via a centrally located upper spring 36 and a plurality of circumferentially spaced lower springs 38. The lower portion of casin 28 is filled with lubricating oil thereby defining an oil sump 40.
- Compressor portion 34 may include an oil pumping mechanism 42 which extends into the oil sump 40 for withdrawing oil therefrom and lubricating the mechanism of the compressor portion. It will be understood that substantially all such compressing mechanism inherently entrain small amounts of lubricating oil with the refrigerant gas being compressed.
- Compressor 24 further includes a suction inlet opening 44 in casing 28. Refrigerant gas within casing 28 is drawn into the motor-compressor unit through an opening 46 which is preferably at the motor portion end. Compressed gas is discharged from the motor-compressor unit at 48 from whence it passes through a resilient discharge tube 50 which extends through casing 28 as the compressor discharge outlet 52.
- An oil level equalizer conduit 54 communicates and connects the casings 28 of compressors 24 and 26 at the desired gas-oil interface in oil sumps 40. Since this invention contemplates a difference between the suction pressures in the casings 28 of compressors 24 and 26, it will be appreciated that oil equalizer conduit 54 will also conduct a flow of refrigerant gas. Adjacent the inlet to conduit 54 the gas velocity may be sufficiently high so as to carry along oil at the gas-oil interface. To abate this type of oil transfer, a baffle plate 56 may be placed in each casing 28 in spaced alignment with the ends of conduit 54.
- Compressors 24 and 26 are connected in parallel in the refrigerant circuit in the following manner. Each of the compressor discharge outlets is connected to a discharge conduit 58 and each of conduits 58 communicates with the inlet of condenser 14.
- On the suction side of compressor mechanism 22 is a T- or Y-shaped conduit connector 60 having an inlet 62 connected to the outlet of evaporator 20, a first outlet 64 disposed in substantial flow alignment with inlet 62 and connected to a first suction conduit 66 which connects to the suction inlet 44 of first compressor 24.
- Connector 60 has a second outlet 68 which is substantially out of flow alignment with inlet 62. Outlet 68 is connected to a second suction conduit 70 which connects to the suction inlet of a second compressor 26.
- Conduit 70 is crimped at 72 to provide within the conduit a desired flow resistance for reasons hereinafter described.
- Connector 60 may be similar in configuration to the branch coupling shown in US. Patent 24,179.
- outlet 68 makes an acute angle with inlet 62 while outlet 64 makes an obtuse angle with outlet 68. Stated another way, outlet 64 makes a larger angle with inlet 62 than the angle between outlet 68 and inlet 62. It will be evident from this structure that the inertia of oil entrained within suction gas leaving evaporator 20 will cause a major portion of the oil to pass through the outlet 64 of connector 60 through suction conduit '66 into the casing 28 of compressor 24 where it may settle into the oil sump 40 of compressor 24. For the same reasons a slightly greater amount of refrigerant gas should pass from outlet 64 than from outlet 68 thereby maintaining a higher suction pressure in compressor 24 than compressor 26. To adjust or increase this pressure differential suction conduit 70 is crimped at 72 a desired amount as aforementioned.
- the motor portions 32 of compressors 24 and 26 may be connected in parallel to a source 74 of electric power through a thermostat 76 disposed to respond to the tem perature of the conditioned space 12 for simultaneous operation of the compressors. Should it be desired to use a two-stage thermostat to sequentially operate first one and then both compressors, compressors 24 having the normally higher suction pressure should be selected as the compresor which is operated alone for low capacity cooling.
- thermostat 76 closes the circuit for conducting electric current from power source 74 to each of the motors of compressors 24 and 26 for operation thereof.
- compressed refrigerant gas having small amounts of entrained oil discharges from each of outlets 52 and is conducted via discharge conduits 58 to the inlet of condenser 14 wherein the refrigerant is cooled and condensed.
- the refrigerant condensate containing small amounts of Inbricating oil passes from the condenser outlet into receiver 16 from whence it flows to expansion valve 18.
- Expansion valve 18 throttles the oil containing refrigerant liquid to a substantially lower pressure into the inlet of evaporator 20.
- connector 60 also facilitates the maintenance of a higher suction pressure in compressor 24 than in compressor 26. Since a major portion of the oil is returned to compressor 24, the oil level in sump 46 of compressor 24 will begin to exceed the level permitted by the oil equalizer conduit 54. As the oil level rises to the inlet of equalizer conduit 54 in compresor 24, oil will be carried through the equalizer conduit 54 from compressor 24 to compressor 26 owing to the higher pressure in compressor 24. Bafile 56 prevents the refrigerant gas flowin into conduit 54 from carrying an excessive amount of oil to compressor 26. Should the suction pressure differential between compressors 24 and 26 be insufiicient to cause the desired oil flow from the compressor receiving the major portion of the oil, it may be desirable to slightly crimp or otherwise restrict the suction conduit of the other compressor as is shown at 72.
- the oil return system described herein does not require the use of check valves and pumps and does not attempt the difiicult task of maintaining equal suction pressure on the compressors.
- the oil return scheme is simple, inherently reliable, and low in cost. This invention has been found to materially increase the reliability of compressors arranged in parallel relationship.
- a refrigeration apparatus comprising: a refrigerant condenser means; a refrigerant evaporator means; first conduit means connecting the outlet of said refrigerant condenser means to the inlet of said refrigerant evaporator means; first and second refrigerant compressors; a first oil sump for said first refrigerant compressor; a second oil sump for said second refrigerant compressor; a first suction conduit connected to the inlet of said first refrigerant compressor and disposed in fluid communication with the outlet of said refrigerant evaporator means for conducting refrigerant from said refrigerant evaporator means to said first refrigerant compressor; a second suction conduit connected to the inlet of said second refrigerant compressor and disposed in fluid communication with the outlet of said refrigerant evaporator means for conducting refrigerant from said refrigerant evaporator means to said second refrigerant compressor; a discharge conduit means connecting the outlets of said first and sec ond refrigerant compressors
- said means for returning a greater portion of the oil entrained in the refrigerant leaving said evaporator means to said first compressor includes a three-way connection having an inlet connected to the outlet of said refrigerant evaporator means, a first outlet disposed substantially in fluid fiow alignment with said last mentioned inlet and connected to said first suction conduit, and a second outlet disposed substantially out of fluid flow alignment with said last mentioned inlet and connected to said second suction conduit whereby oil entrained in refrigerant gas entering said last mentioned inlet tends to be discharged from said three-way connection through said first outlet.
- said means for maintaining the pressure in said first oil sump higher than the pressure in said second oil sump includes means for rendering said second suction conduit of greater resistance to fluid flow than said first suction conduit.
- a refrigeration apparatus comprising: a refrigerant condenser means; a refrigerant evaporator means; first conduit means connecting the outlet of said refrigerant condenser means to the inlet of said refrigerant evaporator means; a first hermetically sealed casing; a first motorcompressor unit resiliently mounted within said first casing; a.
- first suction conduit connected to the interior of said first casing and disposed in fluid communication with the outlet of said refrigerant evaporator means for conducting refrigerant from said refrigerant evaporator means to said first casing; a second suction conduit connected to the interior of said second casing and disposed in fluid communication with the outlet of said refrigerant evaporator means for conducting refrigerant from said refrigerant evaporator means to said first casing;
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Description
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US590744A US3386262A (en) | 1966-10-31 | 1966-10-31 | Refrigeration apparatus with compressors in parallel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US590744A US3386262A (en) | 1966-10-31 | 1966-10-31 | Refrigeration apparatus with compressors in parallel |
Publications (1)
Publication Number | Publication Date |
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US3386262A true US3386262A (en) | 1968-06-04 |
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Family Applications (1)
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US590744A Expired - Lifetime US3386262A (en) | 1966-10-31 | 1966-10-31 | Refrigeration apparatus with compressors in parallel |
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US (1) | US3386262A (en) |
Cited By (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3785169A (en) * | 1972-06-19 | 1974-01-15 | Westinghouse Electric Corp | Multiple compressor refrigeration system |
US3885938A (en) * | 1974-01-18 | 1975-05-27 | Westinghouse Electric Corp | Refrigeration system with capacity control |
JPS5260953U (en) * | 1975-10-30 | 1977-05-04 | ||
FR2386000A1 (en) * | 1977-03-28 | 1978-10-27 | Copeland Corp | REFRIGERATION MOTOR-COMPRESSOR ASSEMBLY WITH INTEGRATED MULTIPLE UNITS |
US4179248A (en) * | 1978-08-02 | 1979-12-18 | Dunham-Bush, Inc. | Oil equalization system for parallel connected hermetic helical screw compressor units |
DE2847456A1 (en) * | 1978-11-02 | 1980-05-14 | Danfoss As | STARTER CIRCUIT FOR A COMPRESSOR ARRANGEMENT |
US4205537A (en) * | 1978-12-11 | 1980-06-03 | General Electric Company | Multiple hermetic-motor compressor in common shell |
US4277955A (en) * | 1979-09-13 | 1981-07-14 | Lennox Industries, Inc. | Twin compressor mechanism in one enclosure |
US4411141A (en) * | 1981-02-06 | 1983-10-25 | Mitsubishi Denki Kabushiki Kaisha | Parallel operation compressor type refrigerating apparatus |
US4461156A (en) * | 1978-11-28 | 1984-07-24 | Morton Weintraub | System for conditioning an area |
EP0149366A1 (en) * | 1984-01-17 | 1985-07-24 | L'unite Hermetique S.A. | Oil level equalising device for compressors in parallel in a refrigeration circuit, and refrigeration plant with compressors in parallel using such a device |
US4537047A (en) * | 1984-03-02 | 1985-08-27 | Thermo King Corporation | Truck transport refrigeration unit |
US4551989A (en) * | 1984-11-30 | 1985-11-12 | Gulf & Western Manufacturing Company | Oil equalization system for refrigeration compressors |
US4729228A (en) * | 1986-10-20 | 1988-03-08 | American Standard Inc. | Suction line flow stream separator for parallel compressor arrangements |
US4889475A (en) * | 1987-12-24 | 1989-12-26 | Tecumseh Products Company | Twin rotary compressor with suction accumulator |
US4971529A (en) * | 1987-12-24 | 1990-11-20 | Tecumseh Products Company | Twin rotary compressor with suction accumulator |
US5022146A (en) * | 1989-08-30 | 1991-06-11 | Tecumseh Products Company | Twin rotary compressor with suction accumulator |
EP0607101A1 (en) * | 1993-01-14 | 1994-07-20 | Birton A/S | A lubrication oil returning system for refrigeration compressors |
US5385453A (en) * | 1993-01-22 | 1995-01-31 | Copeland Corporation | Multiple compressor in a single shell |
US5704218A (en) * | 1996-04-08 | 1998-01-06 | United Technologies Corporation | Integrated environmental control system |
US20030095871A1 (en) * | 2001-10-29 | 2003-05-22 | Thomas Hebert | Multiple compressor common circuit structure design |
US20040031286A1 (en) * | 2002-08-06 | 2004-02-19 | York International Corporation | Suction connection for dual centrifugal compressor refrigeration systems |
WO2005103492A1 (en) * | 2004-04-20 | 2005-11-03 | Danfoss Commercial Compressors | Gas distribution device |
US20120017636A1 (en) * | 2009-05-29 | 2012-01-26 | Panasonic Corporation | Refrigeration cycle apparatus |
WO2012072139A3 (en) * | 2010-12-02 | 2012-09-27 | Carrier Corporation | Oil compensation in a refrigeration circuit |
US20130136622A1 (en) * | 2011-11-30 | 2013-05-30 | Danfoss Commercial Compressors | Compression device and a thermodynamic system comprising such a compression device |
US20130330210A1 (en) * | 2012-06-12 | 2013-12-12 | Danfoss Commerical Compressors | Compression device, and thermodynamic system comprising such a compression device |
EP2885541A4 (en) * | 2012-07-31 | 2016-05-18 | Bitzer Kuehlmaschinenbau Gmbh | Suction header arrangement for oil management in multiple-compressor systems |
US20170108255A1 (en) * | 2015-10-15 | 2017-04-20 | Danfoss (Tianjin) Ltd. | Oil-gas balancing apparatus and compressor system with the same |
US9689386B2 (en) | 2012-07-31 | 2017-06-27 | Bitzer Kuehlmaschinenbau Gmbh | Method of active oil management for multiple scroll compressors |
US20180274835A1 (en) * | 2017-03-21 | 2018-09-27 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in tandem-compressor systems |
EP3405724A4 (en) * | 2016-01-22 | 2019-10-02 | BITZER Kühlmaschinenbau GmbH | Oil distribution in multiple-compressor systems utilizing variable speed |
US10465675B2 (en) | 2013-12-17 | 2019-11-05 | Trane International Inc. | Fluid valve |
US10465937B2 (en) | 2017-08-08 | 2019-11-05 | Lennox Industries Inc. | Hybrid tandem compressor system and method of use |
US10495089B2 (en) | 2012-07-31 | 2019-12-03 | Bitzer Kuehlmashinenbau GmbH | Oil equalization configuration for multiple compressor systems containing three or more compressors |
US10571167B2 (en) | 2015-03-20 | 2020-02-25 | Carrier Corporation | Transportation refrigeration unit with multiple compressors |
US10655897B2 (en) | 2017-03-21 | 2020-05-19 | Lennox Industries Inc. | Method and apparatus for common pressure and oil equalization in multi-compressor systems |
US10731901B2 (en) | 2017-03-21 | 2020-08-04 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in multi-compressor systems |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2076332A (en) * | 1935-06-29 | 1937-04-06 | York Ice Machinery Corp | Lubrication system |
US2294552A (en) * | 1937-05-13 | 1942-09-01 | Curtis Mfg Co | Refrigerating condensing unit |
US2663164A (en) * | 1951-11-02 | 1953-12-22 | Gen Electric | Parallel compressor arrangement in refrigerating system |
-
1966
- 1966-10-31 US US590744A patent/US3386262A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2076332A (en) * | 1935-06-29 | 1937-04-06 | York Ice Machinery Corp | Lubrication system |
US2294552A (en) * | 1937-05-13 | 1942-09-01 | Curtis Mfg Co | Refrigerating condensing unit |
US2663164A (en) * | 1951-11-02 | 1953-12-22 | Gen Electric | Parallel compressor arrangement in refrigerating system |
Cited By (53)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3785169A (en) * | 1972-06-19 | 1974-01-15 | Westinghouse Electric Corp | Multiple compressor refrigeration system |
FR2189689A1 (en) * | 1972-06-19 | 1974-01-25 | Westinghouse Electric Corp | |
US3885938A (en) * | 1974-01-18 | 1975-05-27 | Westinghouse Electric Corp | Refrigeration system with capacity control |
JPS5260953U (en) * | 1975-10-30 | 1977-05-04 | ||
FR2386000A1 (en) * | 1977-03-28 | 1978-10-27 | Copeland Corp | REFRIGERATION MOTOR-COMPRESSOR ASSEMBLY WITH INTEGRATED MULTIPLE UNITS |
US4179248A (en) * | 1978-08-02 | 1979-12-18 | Dunham-Bush, Inc. | Oil equalization system for parallel connected hermetic helical screw compressor units |
DE2847456A1 (en) * | 1978-11-02 | 1980-05-14 | Danfoss As | STARTER CIRCUIT FOR A COMPRESSOR ARRANGEMENT |
US4461156A (en) * | 1978-11-28 | 1984-07-24 | Morton Weintraub | System for conditioning an area |
US4205537A (en) * | 1978-12-11 | 1980-06-03 | General Electric Company | Multiple hermetic-motor compressor in common shell |
US4277955A (en) * | 1979-09-13 | 1981-07-14 | Lennox Industries, Inc. | Twin compressor mechanism in one enclosure |
US4411141A (en) * | 1981-02-06 | 1983-10-25 | Mitsubishi Denki Kabushiki Kaisha | Parallel operation compressor type refrigerating apparatus |
EP0149366A1 (en) * | 1984-01-17 | 1985-07-24 | L'unite Hermetique S.A. | Oil level equalising device for compressors in parallel in a refrigeration circuit, and refrigeration plant with compressors in parallel using such a device |
US4537047A (en) * | 1984-03-02 | 1985-08-27 | Thermo King Corporation | Truck transport refrigeration unit |
US4551989A (en) * | 1984-11-30 | 1985-11-12 | Gulf & Western Manufacturing Company | Oil equalization system for refrigeration compressors |
US4729228A (en) * | 1986-10-20 | 1988-03-08 | American Standard Inc. | Suction line flow stream separator for parallel compressor arrangements |
FR2605393A1 (en) * | 1986-10-20 | 1988-04-22 | American Standard Inc | CURRENT SEPARATOR FOR SUCTION DRAIN AND MULTI-COMPRESSOR REFRIGERATION CIRCUIT |
US4889475A (en) * | 1987-12-24 | 1989-12-26 | Tecumseh Products Company | Twin rotary compressor with suction accumulator |
US4971529A (en) * | 1987-12-24 | 1990-11-20 | Tecumseh Products Company | Twin rotary compressor with suction accumulator |
US5022146A (en) * | 1989-08-30 | 1991-06-11 | Tecumseh Products Company | Twin rotary compressor with suction accumulator |
EP0607101A1 (en) * | 1993-01-14 | 1994-07-20 | Birton A/S | A lubrication oil returning system for refrigeration compressors |
US5385453A (en) * | 1993-01-22 | 1995-01-31 | Copeland Corporation | Multiple compressor in a single shell |
US5704218A (en) * | 1996-04-08 | 1998-01-06 | United Technologies Corporation | Integrated environmental control system |
US20030095871A1 (en) * | 2001-10-29 | 2003-05-22 | Thomas Hebert | Multiple compressor common circuit structure design |
US6948916B2 (en) * | 2001-10-29 | 2005-09-27 | Global Energy Group, Inc. | Piping layout for multiple compressor system |
US20040031286A1 (en) * | 2002-08-06 | 2004-02-19 | York International Corporation | Suction connection for dual centrifugal compressor refrigeration systems |
US6910349B2 (en) * | 2002-08-06 | 2005-06-28 | York International Corporation | Suction connection for dual centrifugal compressor refrigeration systems |
WO2005103492A1 (en) * | 2004-04-20 | 2005-11-03 | Danfoss Commercial Compressors | Gas distribution device |
US20120017636A1 (en) * | 2009-05-29 | 2012-01-26 | Panasonic Corporation | Refrigeration cycle apparatus |
WO2012072139A3 (en) * | 2010-12-02 | 2012-09-27 | Carrier Corporation | Oil compensation in a refrigeration circuit |
CN103403477A (en) * | 2010-12-02 | 2013-11-20 | 开利公司 | Oil compensation in a refrigeration circuit |
CN103403477B (en) * | 2010-12-02 | 2016-08-10 | 开利公司 | Repairing in refrigeration loop |
US9551351B2 (en) * | 2011-11-30 | 2017-01-24 | Danfoss Commercial Compressors | Compression device and a thermodynamic system comprising such a compression device |
US20130136622A1 (en) * | 2011-11-30 | 2013-05-30 | Danfoss Commercial Compressors | Compression device and a thermodynamic system comprising such a compression device |
US20130330210A1 (en) * | 2012-06-12 | 2013-12-12 | Danfoss Commerical Compressors | Compression device, and thermodynamic system comprising such a compression device |
US9273678B2 (en) * | 2012-06-12 | 2016-03-01 | Danfoss Commercial Compressors | Compression device, and thermodynamic system comprising such a compression device |
EP2885541A4 (en) * | 2012-07-31 | 2016-05-18 | Bitzer Kuehlmaschinenbau Gmbh | Suction header arrangement for oil management in multiple-compressor systems |
US10634137B2 (en) | 2012-07-31 | 2020-04-28 | Bitzer Kuehlmaschinenbau Gmbh | Suction header arrangement for oil management in multiple-compressor systems |
US9689386B2 (en) | 2012-07-31 | 2017-06-27 | Bitzer Kuehlmaschinenbau Gmbh | Method of active oil management for multiple scroll compressors |
US10495089B2 (en) | 2012-07-31 | 2019-12-03 | Bitzer Kuehlmashinenbau GmbH | Oil equalization configuration for multiple compressor systems containing three or more compressors |
US10465675B2 (en) | 2013-12-17 | 2019-11-05 | Trane International Inc. | Fluid valve |
US10571167B2 (en) | 2015-03-20 | 2020-02-25 | Carrier Corporation | Transportation refrigeration unit with multiple compressors |
US10557651B2 (en) * | 2015-10-15 | 2020-02-11 | Danfoss (Tianjin) Ltd. | Oil-gas balancing apparatus and compressor system with the same |
US20170108255A1 (en) * | 2015-10-15 | 2017-04-20 | Danfoss (Tianjin) Ltd. | Oil-gas balancing apparatus and compressor system with the same |
EP3405724A4 (en) * | 2016-01-22 | 2019-10-02 | BITZER Kühlmaschinenbau GmbH | Oil distribution in multiple-compressor systems utilizing variable speed |
US10760831B2 (en) | 2016-01-22 | 2020-09-01 | Bitzer Kuehlmaschinenbau Gmbh | Oil distribution in multiple-compressor systems utilizing variable speed |
US10495365B2 (en) * | 2017-03-21 | 2019-12-03 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in tandem-compressor systems |
US20180274835A1 (en) * | 2017-03-21 | 2018-09-27 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in tandem-compressor systems |
US10655897B2 (en) | 2017-03-21 | 2020-05-19 | Lennox Industries Inc. | Method and apparatus for common pressure and oil equalization in multi-compressor systems |
US10731901B2 (en) | 2017-03-21 | 2020-08-04 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in multi-compressor systems |
US11274862B2 (en) | 2017-03-21 | 2022-03-15 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in multi-compressor systems |
US11415347B2 (en) | 2017-03-21 | 2022-08-16 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in tandem-compressor systems |
US10465937B2 (en) | 2017-08-08 | 2019-11-05 | Lennox Industries Inc. | Hybrid tandem compressor system and method of use |
US10935274B2 (en) | 2017-08-08 | 2021-03-02 | Lennox Industries Inc. | Hybrid tandem compressor system and method of use |
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