US3785169A - Multiple compressor refrigeration system - Google Patents
Multiple compressor refrigeration system Download PDFInfo
- Publication number
- US3785169A US3785169A US00264101A US3785169DA US3785169A US 3785169 A US3785169 A US 3785169A US 00264101 A US00264101 A US 00264101A US 3785169D A US3785169D A US 3785169DA US 3785169 A US3785169 A US 3785169A
- Authority
- US
- United States
- Prior art keywords
- compressor
- shell
- running
- oil
- compressors
- 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
Links
Images
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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
- F04B39/0207—Lubrication with lubrication control systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/24—Level of liquid, e.g. lubricant or cooling liquid
-
- 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 A multiple compressor refrigeration system having at least first and second hermetic shell compressors with the suction line of the system connected into the upper portion of the first compressor shell and a suction line extending from within the upper portion of the first compressor shell to within the upper portion of the shell of the second compressor and with the discharge lines of the first and second compressors connected in parallel to the high pressure line of the system.
- An oil equalizing conduit is connected between the crankcase portions of the shells of the first and second compressors at the height of the minimum desired oil level to be maintained in the first compressor when both compressors are running with normal quantities of oil in the system.
- a multiple compressor refrigeration system is provided with at least first and second hermetic shell compressors, the first of which is intended to be always running when the system operates and the second of which may be cycled off and on to vary the capacity of the system during its running.
- the first compressor is provided with a suction gas conduit extending into the upper part of its shell and the second compressor is provided with a suction gas conduit extending from within the upper part of the first compressor shell to within the upper part of the second compressor shell.
- an oil equalizing conduit extends from the shell of the first compressor to the shell of the second compressor and is located at a position above the crankcase bottom of the first compressor equivalent to the minimum desired oil level in the first compressor whether or not one or both compressors are running. Since, when the second compressor is not running, the oil in the second compressor tends to be cooler, an oil crankcase heater is provided in the second compressor to be energized when the second compressor is cycled off to be not running. Since the system of this invention avoids the parallel suction path of the prior systems the operation of the crankcase heater is most effective because there is no cooling of the oil by circulating refrigerant in the not running compressor.
- FIG. 1 is a top plan diagrammatic view showing the connections of two compressors in a multiple compressor refrigeration system in accordance with the invention
- FIG. 2 is a side elevation diagrammatic view similar to FIG. 1 and showing the oil levels in both compressors when only the first compressor is running;
- FIG. 3 is a view similarto FIG. 2 but showing the oil levels in both compressors when both compressors are running.
- a multiple compressor refrigeration system is provided with at least two compressors such as shown at I and 2. Both compressors are of the hermetic shell type as well known in the art.
- the first compressor 1 is provided with a suction line conduit 12 adapted to be connected to the suction line of the refrigerant system (not shown) and extending to a flare and strainer 13 within the upper portion of compressor shell 14.
- the second compressor 2 is provided. with a suction gas conduit 15 extending from within the upper portion of shell 14 to a flare and strainer 16 within the upper portion of the compressor shell 17.
- the discharge line 18 of compressor 1 is connected bya conduit 19 in parallel with the discharge line 20 of compressor 2 to the high pressure line 21 to be connected to the refrigeration system.
- an oil equalizing conduit 30 is provided to extend from within the compressor shell 14 in the crankcase of compressor 1 to within the shell 17 in the crankcase of compressor 2.
- the point of connection 31 into compressor 1 is at a height that will provide a first minimum oil level in compressor 1 when both compressors are running as shown by FIG. 3 of the drawing and second oil levels in both compressors somewhat above the first level in the first compressor when only the first compressor is running as shown by FIG. 2 of the drawing.
- the suction conduit 15 extends into the shell 14 of compressor 1 beyond the inner surface of the shell as shown at 45.
- This arrangement provides an effective laybrinth for the flow of oil wiped on the inner surface of shell 14 to prevent its induction into the suction conduit 15 and assuring its return to the crankcase of the always running compressor 1.
- a multiple compressor refrigeration system arrangement comprising, a first hermetic shell compressor intended to be always running when the system is operating, a second hermetic shell compressor that may be cycled on and off when the system is running, a first suction gas conduit adapted to be connected to the suction line of the system and extending into the upper portion of the shell of said first compressor, a second suction line extending from within the upper portion of said first compressor shell to within the upper portion of said second compressor shell, a first high pressure discharge line extending from said first compressor and connected in parallel to a second high pressure discharge line extending from said second compressor and adapted to be connected to the high pressure line of said system, and an oil equalizing conduit, connected between the shells of said first and second compressors and connected to open into said first compressor at the height of minimum desired oil level to be maintained in said first compressor when said first and second compressors are both running with normal oil supply in the system and connected to open in said second compressor at substantially the same height.
- crankcase heater is disposed in the shell of said second compressor beneath the level of oil to be normally maintained when said second compressor is cycled to be not running, said heater being adapted to be energized when said secondcompressor is not running.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Compressor (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26410172A | 1972-06-19 | 1972-06-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3785169A true US3785169A (en) | 1974-01-15 |
Family
ID=23004583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00264101A Expired - Lifetime US3785169A (en) | 1972-06-19 | 1972-06-19 | Multiple compressor refrigeration system |
Country Status (10)
Country | Link |
---|---|
US (1) | US3785169A (de) |
JP (1) | JPS5236629B2 (de) |
AU (1) | AU476083B2 (de) |
BE (1) | BE801043A (de) |
CA (1) | CA971765A (de) |
DE (1) | DE2330311A1 (de) |
ES (1) | ES416040A1 (de) |
FR (1) | FR2189689B1 (de) |
GB (1) | GB1429084A (de) |
IT (1) | IT990755B (de) |
Cited By (44)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3859815A (en) * | 1973-10-12 | 1975-01-14 | Maekawa Seisakusho Kk | Two-stage compression apparatus |
US4102149A (en) * | 1977-04-22 | 1978-07-25 | Westinghouse Electric Corp. | Variable capacity multiple compressor refrigeration system |
US4105374A (en) * | 1977-03-28 | 1978-08-08 | Copeland Corporation | Integrated multi-unit refrigeration motor-compressor assembly |
US4179248A (en) * | 1978-08-02 | 1979-12-18 | Dunham-Bush, Inc. | Oil equalization system for parallel connected hermetic helical screw compressor units |
US4205537A (en) * | 1978-12-11 | 1980-06-03 | General Electric Company | Multiple hermetic-motor compressor in common shell |
US4252506A (en) * | 1978-09-01 | 1981-02-24 | Tecumseh Products Company | Variable capacity compressor |
US4358254A (en) * | 1978-09-01 | 1982-11-09 | Tecumseh Products Company | Variable capacity compressor |
US4411141A (en) * | 1981-02-06 | 1983-10-25 | Mitsubishi Denki Kabushiki Kaisha | Parallel operation compressor type refrigerating apparatus |
US4418548A (en) * | 1982-03-29 | 1983-12-06 | Trane Cac, Inc. | Variable capacity multiple compressor refrigeration system |
US4505650A (en) * | 1983-08-05 | 1985-03-19 | Carrier Corporation | Duplex compressor oil sump |
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 |
DE3805094C1 (de) * | 1987-10-13 | 1989-05-18 | American Standard Inc., New York, N.Y., Us | |
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 |
US5150586A (en) * | 1989-11-16 | 1992-09-29 | Basseggio Narcizo O | System and process of compressing miscible fluids |
US5236311A (en) * | 1992-01-09 | 1993-08-17 | Tecumseh Products Company | Compressor device for controlling oil level in two-stage high dome compressor |
US5435144A (en) * | 1994-02-24 | 1995-07-25 | Kalmbach; John | Compressor lubricant distributing system for motor vehicles having auxiliary air conditioning |
US5839886A (en) * | 1996-05-10 | 1998-11-24 | Shaw; David N. | Series connected primary and booster compressors |
US5927088A (en) * | 1996-02-27 | 1999-07-27 | Shaw; David N. | Boosted air source heat pump |
US6276148B1 (en) | 2000-02-16 | 2001-08-21 | David N. Shaw | Boosted air source heat pump |
US6446462B1 (en) * | 2000-07-07 | 2002-09-10 | Sanyo Electric Co., Ltd. | Freezing apparatus |
WO2003038278A2 (en) * | 2001-10-29 | 2003-05-08 | Hebert Thomas H | Multiple compressor common circuit structure design |
US6931871B2 (en) | 2003-08-27 | 2005-08-23 | Shaw Engineering Associates, Llc | Boosted air source heat pump |
US20060073026A1 (en) * | 2004-10-06 | 2006-04-06 | Shaw David N | Oil balance system and method for compressors connected in series |
US20080134701A1 (en) * | 2006-12-12 | 2008-06-12 | Ole Moelgaard Christensen | Variable Compressor Oil Return |
US20080173034A1 (en) * | 2007-01-19 | 2008-07-24 | Hallowell International, Llc | Heat pump apparatus and method |
US20090277213A1 (en) * | 2006-04-20 | 2009-11-12 | Katsumi Sakitani | Refrigerating Apparatus |
US20100186439A1 (en) * | 2008-05-23 | 2010-07-29 | Panasonic Corporation | Fluid machine and refrigeration cycle apparatus |
US20100218522A1 (en) * | 2009-02-09 | 2010-09-02 | Earthlinked Technologies, Inc. | Oil return system and method for active charge control in an air conditioning system |
FR2968731A1 (fr) * | 2010-12-13 | 2012-06-15 | Danfoss Commercial Compressors | Systeme thermodynamique equipe d'une pluralite de compresseurs |
US20140124166A1 (en) * | 2012-11-06 | 2014-05-08 | Carrier Corporation | Compressor crank case heater energy reduction |
US20140154105A1 (en) * | 2012-12-03 | 2014-06-05 | Danfoss (Tianjin) Ltd. | Oil balancing apparatus and refrigeration device |
US20180274830A1 (en) * | 2017-03-21 | 2018-09-27 | Lennox Industries Inc. | Method and apparatus for common pressure and oil equalization in multi-compressor systems |
US20180274835A1 (en) * | 2017-03-21 | 2018-09-27 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in tandem-compressor systems |
EP3396163A1 (de) * | 2017-04-28 | 2018-10-31 | Pfeiffer Vacuum Gmbh | Vakuumpumpe mit schmiermittelpegel-begrenzungsvorrichtung |
US20180340526A1 (en) * | 2017-05-26 | 2018-11-29 | Lennox Industries Inc. | Method and apparatus for common pressure and oil equalization in multi-compressor systems |
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 |
US10571167B2 (en) | 2015-03-20 | 2020-02-25 | Carrier Corporation | Transportation refrigeration unit with multiple compressors |
US10731901B2 (en) | 2017-03-21 | 2020-08-04 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in multi-compressor systems |
US11460224B2 (en) * | 2018-10-31 | 2022-10-04 | Emerson Climate Technologies, Inc. | Oil control for climate-control system |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2545580B1 (fr) * | 1983-05-02 | 1986-07-25 | Puicervert Marc | Dispositif de maintien permanent d'huile dans les carters de compresseurs |
JPH01193089A (ja) * | 1988-01-29 | 1989-08-03 | Toshiba Corp | ロータリコンプレッサー |
DK4093A (da) * | 1993-01-14 | 1994-09-12 | Birton As | Anlæg til tilbageføring af smøreolie i kølekompressorer |
JP6476810B2 (ja) * | 2014-12-10 | 2019-03-06 | ダイキン工業株式会社 | 圧縮機の予熱装置 |
CN106403071A (zh) * | 2016-11-28 | 2017-02-15 | 广东欧科空调制冷有限公司 | 一种双压缩机管路结构 |
CN114440482B (zh) * | 2022-01-04 | 2024-01-23 | 特灵空调系统(中国)有限公司 | 压缩机组和换热系统 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2175913A (en) * | 1935-12-18 | 1939-10-10 | Nash Kelvinator Corp | Motor-compressor unit for refrigerating apparatus |
US2253623A (en) * | 1937-05-18 | 1941-08-26 | Westinghouse Electric & Mfg Co | Refrigerating apparatus |
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 |
US3274796A (en) * | 1965-09-23 | 1966-09-27 | Vilter Manufacturing Corp | Refrigeration system with lube oil separation means |
US3386262A (en) * | 1966-10-31 | 1968-06-04 | Trane Co | Refrigeration apparatus with compressors in parallel |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3577741A (en) * | 1969-06-02 | 1971-05-04 | Carrier Corp | Refrigeration apparatus |
-
1972
- 1972-06-19 US US00264101A patent/US3785169A/en not_active Expired - Lifetime
-
1973
- 1973-05-31 AU AU56364/73A patent/AU476083B2/en not_active Expired
- 1973-06-04 GB GB2645073A patent/GB1429084A/en not_active Expired
- 1973-06-07 CA CA173,474A patent/CA971765A/en not_active Expired
- 1973-06-14 DE DE2330311A patent/DE2330311A1/de active Pending
- 1973-06-18 FR FR7322104A patent/FR2189689B1/fr not_active Expired
- 1973-06-18 ES ES416040A patent/ES416040A1/es not_active Expired
- 1973-06-18 BE BE132370A patent/BE801043A/xx unknown
- 1973-06-19 IT IT25549/73A patent/IT990755B/it active
- 1973-06-19 JP JP48068346A patent/JPS5236629B2/ja not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2175913A (en) * | 1935-12-18 | 1939-10-10 | Nash Kelvinator Corp | Motor-compressor unit for refrigerating apparatus |
US2294552A (en) * | 1937-05-13 | 1942-09-01 | Curtis Mfg Co | Refrigerating condensing unit |
US2253623A (en) * | 1937-05-18 | 1941-08-26 | Westinghouse Electric & Mfg Co | Refrigerating apparatus |
US2663164A (en) * | 1951-11-02 | 1953-12-22 | Gen Electric | Parallel compressor arrangement in refrigerating system |
US3274796A (en) * | 1965-09-23 | 1966-09-27 | Vilter Manufacturing Corp | Refrigeration system with lube oil separation means |
US3386262A (en) * | 1966-10-31 | 1968-06-04 | Trane Co | Refrigeration apparatus with compressors in parallel |
Cited By (68)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3859815A (en) * | 1973-10-12 | 1975-01-14 | Maekawa Seisakusho Kk | Two-stage compression apparatus |
US4105374A (en) * | 1977-03-28 | 1978-08-08 | Copeland Corporation | Integrated multi-unit refrigeration motor-compressor assembly |
US4102149A (en) * | 1977-04-22 | 1978-07-25 | Westinghouse Electric Corp. | Variable capacity multiple compressor refrigeration system |
US4179248A (en) * | 1978-08-02 | 1979-12-18 | Dunham-Bush, Inc. | Oil equalization system for parallel connected hermetic helical screw compressor units |
US4358254A (en) * | 1978-09-01 | 1982-11-09 | Tecumseh Products Company | Variable capacity compressor |
US4252506A (en) * | 1978-09-01 | 1981-02-24 | Tecumseh Products Company | Variable capacity compressor |
US4205537A (en) * | 1978-12-11 | 1980-06-03 | General Electric Company | Multiple hermetic-motor compressor in common shell |
US4411141A (en) * | 1981-02-06 | 1983-10-25 | Mitsubishi Denki Kabushiki Kaisha | Parallel operation compressor type refrigerating apparatus |
US4418548A (en) * | 1982-03-29 | 1983-12-06 | Trane Cac, Inc. | Variable capacity multiple compressor refrigeration system |
US4505650A (en) * | 1983-08-05 | 1985-03-19 | Carrier Corporation | Duplex compressor oil sump |
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 |
DE3805094C1 (de) * | 1987-10-13 | 1989-05-18 | American Standard Inc., New York, N.Y., Us | |
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 |
US5150586A (en) * | 1989-11-16 | 1992-09-29 | Basseggio Narcizo O | System and process of compressing miscible fluids |
US5236311A (en) * | 1992-01-09 | 1993-08-17 | Tecumseh Products Company | Compressor device for controlling oil level in two-stage high dome compressor |
US5435144A (en) * | 1994-02-24 | 1995-07-25 | Kalmbach; John | Compressor lubricant distributing system for motor vehicles having auxiliary air conditioning |
US5927088A (en) * | 1996-02-27 | 1999-07-27 | Shaw; David N. | Boosted air source heat pump |
US5839886A (en) * | 1996-05-10 | 1998-11-24 | Shaw; David N. | Series connected primary and booster compressors |
US6276148B1 (en) | 2000-02-16 | 2001-08-21 | David N. Shaw | Boosted air source heat pump |
USRE39625E1 (en) | 2000-02-16 | 2007-05-15 | Hallowell International, Llc | Boosted air source heat pump |
US6446462B1 (en) * | 2000-07-07 | 2002-09-10 | Sanyo Electric Co., Ltd. | Freezing apparatus |
WO2003038278A2 (en) * | 2001-10-29 | 2003-05-08 | Hebert Thomas H | Multiple compressor common circuit structure design |
US20030095871A1 (en) * | 2001-10-29 | 2003-05-22 | Thomas Hebert | Multiple compressor common circuit structure design |
WO2003038278A3 (en) * | 2001-10-29 | 2003-10-16 | Thomas H 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 |
US6931871B2 (en) | 2003-08-27 | 2005-08-23 | Shaw Engineering Associates, Llc | Boosted air source heat pump |
US20090007588A1 (en) * | 2004-10-06 | 2009-01-08 | David Shaw | Oil Balance System and Method for Compressors |
US7651322B2 (en) | 2004-10-06 | 2010-01-26 | Hallowell International, Llc | Oil balance system and method for compressors connected in series |
US20080085195A1 (en) * | 2004-10-06 | 2008-04-10 | Hallowell International, Llc | Oil balance system and method for compressors connected in series |
US8075283B2 (en) * | 2004-10-06 | 2011-12-13 | Hallowell International, Llc | Oil balance system and method for compressors connected in series |
US20080283133A1 (en) * | 2004-10-06 | 2008-11-20 | Hallowell International, Llc | Oil balance system and method for compressors connected in series |
US20060073026A1 (en) * | 2004-10-06 | 2006-04-06 | Shaw David N | Oil balance system and method for compressors connected in series |
US7712329B2 (en) | 2004-10-06 | 2010-05-11 | David Shaw | Oil balance system and method for compressors |
US20090277213A1 (en) * | 2006-04-20 | 2009-11-12 | Katsumi Sakitani | Refrigerating Apparatus |
US8312732B2 (en) * | 2006-04-20 | 2012-11-20 | Daikin Industries, Ltd. | Refrigerating apparatus |
US20080134701A1 (en) * | 2006-12-12 | 2008-06-12 | Ole Moelgaard Christensen | Variable Compressor Oil Return |
US20080173034A1 (en) * | 2007-01-19 | 2008-07-24 | Hallowell International, Llc | Heat pump apparatus and method |
US20100186439A1 (en) * | 2008-05-23 | 2010-07-29 | Panasonic Corporation | Fluid machine and refrigeration cycle apparatus |
US20100218522A1 (en) * | 2009-02-09 | 2010-09-02 | Earthlinked Technologies, Inc. | Oil return system and method for active charge control in an air conditioning system |
US10184700B2 (en) * | 2009-02-09 | 2019-01-22 | Total Green Mfg. Corp. | Oil return system and method for active charge control in an air conditioning system |
FR2968731A1 (fr) * | 2010-12-13 | 2012-06-15 | Danfoss Commercial Compressors | Systeme thermodynamique equipe d'une pluralite de compresseurs |
WO2012080611A1 (fr) * | 2010-12-13 | 2012-06-21 | Danfoss Commercial Compressors | Système thermodynamique équipé d'une pluralité de compresseurs |
CN103261690A (zh) * | 2010-12-13 | 2013-08-21 | 丹佛斯商用压缩机有限公司 | 配设有多个压缩机的热力学系统 |
DE112011104357T5 (de) | 2010-12-13 | 2013-09-12 | Danfoss Commercial Compressors | Thermodynamisches System, das mir einer Vielzahl von Verdichtern ausgestattet ist |
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Also Published As
Publication number | Publication date |
---|---|
DE2330311A1 (de) | 1974-01-10 |
GB1429084A (en) | 1976-03-24 |
CA971765A (en) | 1975-07-29 |
IT990755B (it) | 1975-07-10 |
BE801043A (fr) | 1973-12-18 |
AU5636473A (en) | 1974-12-05 |
FR2189689B1 (de) | 1976-04-30 |
FR2189689A1 (de) | 1974-01-25 |
ES416040A1 (es) | 1976-02-16 |
AU476083B2 (en) | 1976-09-09 |
JPS4957438A (de) | 1974-06-04 |
JPS5236629B2 (de) | 1977-09-17 |
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