US3360958A - Multiple compressor lubrication apparatus - Google Patents
Multiple compressor lubrication apparatus Download PDFInfo
- Publication number
- US3360958A US3360958A US522165A US52216566A US3360958A US 3360958 A US3360958 A US 3360958A US 522165 A US522165 A US 522165A US 52216566 A US52216566 A US 52216566A US 3360958 A US3360958 A US 3360958A
- Authority
- US
- United States
- Prior art keywords
- oil
- compressors
- compressor
- crankcases
- excess
- 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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
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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
- 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
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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
- 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
- Oil handling apparatus for a plurality of compressors interconnected in a closed refrigeration circuit comprising an excess oil receiver connected to the crankcases of said compressors at the normal, operating oil level therein and pump means for continuously circulating excess oil from said oil receiver through said compressor crankcases, whereby a reserve supply of circulating oil is readily available to make up any oil deficiency in said crankcases.
- a suction gas actuated ejector is utilized as the pump means for inducing oil flow from said oil receiver back into said refrigeration circuit.
- This invention relates to refrigeration systems employing a plurality of compressors, and more particularly to means for lubricating the bearings and moving parts of such compressors.
- an oil handling system particularly adapted to insure the proper lubrication of a plurality of compressors operating either in series to serve a multi-ternperature cooling load or in parallel to handle the cooling load imposed on a single, large evaporator.
- the basic concept and primary objective of my invention lies in the installation of an excess oil receiver in a multiple compressor refrigeration circuit in such a way as to provide a reservoir through which an excess of oil added to the system may circulate, the extra oil serving to refill the compressor crankcases as oil is gradually lost from the compressors and deposited throughout the circuit.
- an object of my invention is to provide an excess oil receiver in combination with a refrigeration circuit including a plurality of series connected reciprocating compressors operating at different pressure levels and having their crankcases connected by an oil flow line, the excess oil receiver being connected to the crankcase of the lowest pressure stage compressor at the point of normal oil level therein.
- a second object is to provide excess oil receiver means in combination with a refrigeration system including a plurality of compressors operating in parallel, the excess oil receiver being connected to the crankcases of the receivers at the normal oil level therein.
- Another object is to provide an excess oil receiver connected in a multiple compressor refrigeration circuit as stated in the preceding objectives wherein the refrigeration circuit also includes means to continuously recirculate oil from the excess oil receiver to the compressor crankcases.
- a still further objective of my invention is to provide oil handling apparatus as stated in the aforesaid objectives wherein an ejector operated by the refrigerant gas flowing to the compressors and connected to the excess oil receiver serves as the means for recirculating oil from the excess oil receiver to the compressor crankcases.
- FIGURE 1 is a schematic view of a multiple stage refrigeration system incorporating my improved oil handling apparatus
- FIGURE 2 is a schematic view of a parallel compressor installation incorporating my improved oil handling apparatus
- FIGURE 3 is a schematic illustration of an alternative form of oil receiver means for use in the system of FIG- URE 2.
- the refrigeration system of FIGURE 1 includes a relatively high temperature evaporator 2 which may handle an air conditioning load, and a low temperature evaporator 16 cooling, for example, an ice cream case. Air to be cooled is circulated over evaporator coil 2 by a fan 4 driven by motor 6. A similar fan-motor combination 18-20 may also be provided for low temperature coil 16.
- the outlet of low temperature coil 16 is connected via suction line 24 to the suction inlet of low stage compressor 13.
- the discharge line 12 from compressor 13 is connected to a second, high pressure stage compressor 14; and suction line 10 from high temperature evaporator 2 leads into line 12 at the inlet to compressor 14.
- suction line 10 from high temperature evaporator 2 leads into line 12 at the inlet to compressor 14.
- the refrigerant in coil 2 evaporates at the relatively higher pressure prevailing in line 12 between the low and high stages of compression.
- Conduit 32 leads from the top of separator 28 to condenser 34, the outlet of which discharges into liquid refrigerant receiver 36.
- Liquid line 38 connects receiver 36 with evaporator coils 2 and 16, the flow of refrigerant through these coils being regulated by thermostatic expansion valves 8 and 22 respectively.
- the multiple stage refrigeration system described thus far is conventional, and operates in the normal manner to produce a low temperature refrigerating effect at evaporator 16 and a higher temperature cooling effect at evaporator 2.
- Refrigerant evaporating in coils 16 and 2 is returned to compressors 13 and 14 through suction lines 24 and respectively, compressed and subsequently condensed to the liquid state in condenser 34.
- Liquid refrigerant accumulates in receiver 36 from which it is supplied to coils 2 and 16 through valves 8 and 22 for re-evaporation.
- a substantial portion of the oil pumped out of compressors 13 and 14 with the refrigerant is removed from admixture therewith in separator 28.
- float valve opens and permits the oil to return to the crankcase of high stage compressor 14 through pipe 40.
- Oil flow line 43 having capillary tube 42 therein connects the crankcases of compressors 13 and 14 at the point where it is desired to maintain the oil level in the crankcases.
- the oil reaches the desired level in the crankcase of compressor 14, it overflows through capillary tube 42 into the crankcase of compressor 13, the higher pressure in the crankcase of high stage compressor 14 acting to force the oil through capillary tube 42.
- the pressure differential between the high and low stage compressor crankcases is thus maintained by capillary tube 42, which also functions to deliver the oil into the low stage compressor crankcase at a controlled rate.
- a float valve responsive to the oil level in the crankcase of compressor 14 could be used to regulate the flow of oil into the crankcase of compressor 13.
- separator 28 is not fully effective to eliminate all. of the oil entrained with the refrigerant.
- some oil is continuously carried over into the refrigeration circuit where a portion of it is gradually deposited in piping traps, and as a film on the walls of the tubing.
- Evaporator coils 2 and 16 are of the direct expansion type, and the refrigerant velocity through these coils is normally great enough to sweep the oil out into suction lines 10 and 24.
- some oil will collect as a film on the walls of the coil tubing, and should the refrigerant velocity become abnormally low for some reason, a substantial amount of oil might accumulate in the evaporator coils.
- the oil that is carried all of the way through the refrigeration system with the refrigerant returns through suction lines 10 and 24 to compressors 13 and 14. Some of the oil separates from the refrigerant in the compressor bodies before the refrigerant enters the compressor suction valves, and a portion of the oil is entrained with the refrigerant discharging into separator 28. Since all of the oil that is carried over into the system with the refrigerant leaving separator 28 is not returned to the compressors through suction lines 10 and 24, and a portion thereof is gradually accumulated throughout the system, the oil level in the compressor crankcases will slowly drop. Furthermore, the levels in the two crankcases will quite likely drop unevenly as a result of several operating characteristics of the multiple stage compressor system I have shown.
- the loss of oil from the crankcases of compressors 13 and 14 may well take place at different rates due to differences in the degree of oil leakage around the compressor pistons and in the amount of foaming of the refrigerant-oil mixture in the crankcases.
- the accumulation of any appreciable amount of oil in the refrigeration system would probably cause the oil level in the low stage compressor 13 to suffer the greatest drop because of the fact that the crankcase of this compressor will not receive any oil through capillary tube 42 until the oil in the crankcase of compressor 14 has risen to the predetermined operating level.
- My oil handling apparatus operates asfollows. An excess of oil beyond that normally required for the proper lubrication of compressors 13 and 14 is provided in oil receiver 46, and the refrigeration system is started up. The flow of refrigerant gas from suction line 24 through eductor 52 will induce a slow flow of oil from receiver 46 through tube 48 back into compressor 13. Restrictor 50 in tube 48 meters the oil flow through suction line 24 at a rate which compressor 13 can handle. Some of this oil will fall into the crankcase of compressor 13 and the remainder will be carried through pipe 12 into compressor 14. That portion of the oil which does not drop into the crankcase of compressor 14 will flow into separator 28 with the refrigerant gas discharging through line 26.
- float valve 30 will eventually permit the oil removed from the refrigerant stream by separator 28 to flow back into the crankcase of compressor 14 through pipe 40. Since compressor 14 will have all of the oil it needs when the system first begins to operate, the excess oil will flow through capillary tube 42 into the crankcase of compressor 13. The oil requirements for compressor 13 also being satisfied at this point, the excess oil will ultimately overflow through conduit 44 into receiver 46.
- FIGURE 2 The application of my oil handling apparatus to a parallel compressor installation will now be described with reference to FIGURE 2, like reference numerals being used to identify like elements of FIGURE 1.
- Compressors 73 and 74 are connected by suction conduits 72 and 71 respectively to common suction line 70 leading from a single evaporator 62.
- Discharge conduits 75 and 77 connect compressors 73 and 74 to a common discharge line 76, which is shown emptying into oil separator 28.
- Conduit 32 leads from oil separator 28 to condenser 34, from which liquid refrigerant flows into receiver 36.
- Liquid refrigerant is directed from receiver 36 to evaporator coil 62 by liquid line 38, the flow of refrigerant through coil 62 being regulated by thermostatic expansion valve 68.
- Fan 64 driven by motor 66, circulates air over coil 62.
- Oil eliminated from the oil-refrigerant mixture discharging from compressors 73 and 74 into oil separator 28 is directed back to the compressor crankcases by pipe 80 and branch pipes 81 and 82 connected thereto.
- oil separator 28 is not used and the oil is permitted to circulate through the circuit with the refrigerant, suction conduits 71 and 72 being relied upon to return equal amounts of oil to the crankcases of both compressors.
- systems of this type invariably suffer from an unequal distribution of oil to the crankcases of the multiple compressors.
- one of the crankcases will eventually be starved of oil, and as oil gradually accumulates throughout the system, this compressor oil shortage becomes more severe.
- FIGURE 3 illustrates a variation of the arrangement shown in FIGURE 2 wherein a single excess oil container is used in place of the two separate oil containers 86 and 87.
- oil pipes 83 and 84 leading from the crankcases of compressors 74 and 73 connect to the same container 85.
- a single eductor tube which is an extension of common conduit 88, serves to withdraw oil from container 85.
- the operation of the oil handling apparatus in conjunction with the refrigeration system is essentially the same as described above with respect to FIGURE 2.
- the use of a single oil container as shown in FIGURE 3 offers the advantage of a simpler and less expensive installation.
- Refrigeration apparatus comprising: a plurality of compressors having oil carrying crankcases, s-aid compressors being interconnected in series flow relationship with a condenser and evaporator means in a closed refrigeration circuit, said evaporator means comprising a low temperature evaporator and a high temperature evaporator, said plurality of compressors comprising a low pressure stage compressor and a high pressure stage compressor, and said refrigeration circuit including a first suction line leading from said low temperature evaporator to the suction inlet of said low pressure stage compressor and a second suction line leading from said high temperature evaporator to the suction inlet of said high pressure stage compressor; and oil handling apparatus for insuring the proper lubrication of said compressors, said oil handling apparatus comprising; oil receiver means containing an excess of oil beyond that initially provided in said crankcases of said compressors, first conduit means placing said oil receiver means in fluid flow communication with said crankcases at the normal oil level therein, second conduit means connecting said oil receiver means to a point in said refrigeration circuit,
- Refrigeration apparatus as recited in claim 1 wherein said oil receiver means comprises a single container and said first conduit means comprises a pipe connecting said container to the crankcase of said low pressure stage compressor and an oil flow line extending between the crankcases of said high and low pressure stage compressors.
- Refrigeration apparatus as defined in claim 2 and further including a flow controller in said oil flow line.
- Refrigeration apparatus as defined in claim 1 and further including an oil separator in said refrigeration circuit between the discharge port of said high pressure stage compressor and said condenser, said oil separator being connected by a pipe to the crankcase of said high pressure stage compressor.
- Refrigeration apparatus comprising: a plurality of compressors having oil carrying crankcases, said compressors being interconnected with a condenser and evaporator means in a closed refrigeration circuit; and oil handling apparatus for insuring the proper lubrication of said compressors, said oil handling apparatus comprising; oil receiver means containing an excess of oil beyond that initially provided in the crankcases of said compressors, first conduit means placing said oil receiver means in fluid flow communication with the crankcases of said compressors at the normal oil level therein, second conduit means connecting said oil receiver means to a point in said refrigeration circuit, and pump means connected to said second conduit means for circulating oil from said oil receiver means back into said refrigeration circuit, said pump means comprising an ejector operated by refrigerant gas flowing from said evaporator means to said compressors.
- Refrigeration apparatus comprising: a plurality of compressors having oil carrying crankcases, said compressors being interconnected in parallel flow relationship with a condenser and evaporator means in a closed refrigeration circuit, said refrigeration circuit including a common suction line leading from said evaporator means to said compressors and a common discharge line leading from said compressors to said condenser; and oil handling apparatus for insuring the proper lubrication of said compressors, said oil handling apparatus comprising; oil receiver means containing an excess of oil beyond that initially provided in said crankcases of said compressors, said oil receiver means comprising separate containers connected by separate pipes to said crankcases of said compressors at the normal oil level therein, conduit means connecting said containers to a point in said refrigeration circuit, and pump means connected to said conduit means for circulating oil from said containers back into said refrigeration circuit.
- Refrigeration apparatus comprising: a plurality of compressors having oil carrying crankcases, said compressors being interconnected in parallel flow relationship with a condenser and evaporator means in a closed refrigeration circuit, said refrigeration circuit including a common suction line leading from said evaporator means to said compressors and a common discharge line leading from said compressors to said condenser; and oil handling apparatus for insuring the proper lubrication of said cornpressors, said oil handling apparatus comprising; oil receiver means containing an excess of oil beyond that initially provided in said crankcases of said compressors, said oil receiver means comprising a single container connected by separate pipes to said crankcases of said compressors at the normal oil level therein, conduit means connecting said container to a point in said refrigeration circuit, and pump means connected to said conduit means for circulating oil from said container back into said refrigeration circuit.
- Refrigeration apparatus as defined in claim 7 wherein said conduit means connects said container to said common suction line.
- Refrigeration apparatus as defined in claim 7 wherein said pump means comprises an ejector operated by refrigerant gas returning through said common suction line to said compressors.
- Refrigeration apparatus comprising: a plurality of compressors having oil carrying crankcases, said compressors being interconnected in parallel flow relationship with a condenser and evaporator means in a closed refrigeration circuit, said refrigeration circuit including a common suction line leading from said evaporator means to said compressors and a common discharge line leading from said compressors to said condenser; and oil handling apparatus for insuring the proper lubrication of said compressors, said oil handling apparatus comprising; oil receiver means containing an excess of oil beyond that initially provided in said crankcases of said compressors, first conduit means placing said oil receiver means in fluid flow communication with said cra-nkcases of said compressors at the normal oil level therein and operative to permit the overflow of excess oil from said crankcases to said oil receiver means, second conduit means connecting said oil receiver means to a point in said refrigeration circuit, pump means connected to said second conduit means for circulating oil from said oil receiver means back into said refrigeration circuit, and an oil separator in said common discharge line, said oil separator being connected by pipes to
Description
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US522165A US3360958A (en) | 1966-01-21 | 1966-01-21 | Multiple compressor lubrication apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US522165A US3360958A (en) | 1966-01-21 | 1966-01-21 | Multiple compressor lubrication apparatus |
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US3360958A true US3360958A (en) | 1968-01-02 |
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US522165A Expired - Lifetime US3360958A (en) | 1966-01-21 | 1966-01-21 | Multiple compressor lubrication apparatus |
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Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3777509A (en) * | 1972-03-13 | 1973-12-11 | Borg Warner | Oil return system for refrigeration apparatus |
US4411141A (en) * | 1981-02-06 | 1983-10-25 | Mitsubishi Denki Kabushiki Kaisha | Parallel operation compressor type refrigerating apparatus |
FR2545580A1 (en) * | 1983-05-02 | 1984-11-09 | Puicervert Marc | Device for permanently keeping oil in the casings of compressors |
US4551989A (en) * | 1984-11-30 | 1985-11-12 | Gulf & Western Manufacturing Company | Oil equalization system for refrigeration compressors |
WO1990000710A1 (en) * | 1988-07-08 | 1990-01-25 | Olson Ref. - H Olson Refrigeration Ab | Device for controlling the supply of oil to a cooling and freezing plant |
US4910972A (en) * | 1988-12-23 | 1990-03-27 | General Electric Company | Refrigerator system with dual evaporators for household refrigerators |
US4918942A (en) * | 1989-10-11 | 1990-04-24 | General Electric Company | Refrigeration system with dual evaporators and suction line heating |
US4966010A (en) * | 1989-01-03 | 1990-10-30 | General Electric Company | Apparatus for controlling a dual evaporator, dual fan refrigerator with independent temperature controls |
US5103650A (en) * | 1991-03-29 | 1992-04-14 | General Electric Company | Refrigeration systems with multiple evaporators |
US5109678A (en) * | 1989-01-03 | 1992-05-05 | General Electric Company | Apparatus for controlling a dual evaporator, dual fan refrigerator with independent temperature controls |
US5134859A (en) * | 1991-03-29 | 1992-08-04 | General Electric Company | Excess refrigerant accumulator for multievaporator vapor compression refrigeration cycles |
US5236311A (en) * | 1992-01-09 | 1993-08-17 | Tecumseh Products Company | Compressor device for controlling oil level in two-stage high dome compressor |
US5375656A (en) * | 1992-10-14 | 1994-12-27 | Oil Dynamics, Inc. | Low flow rate oil supply system for an electric submersible pump |
US5899669A (en) * | 1996-03-19 | 1999-05-04 | Atlas Copco Airpower, Naamloze Vennootschap | Compressor device with vibration isolator |
US20030095871A1 (en) * | 2001-10-29 | 2003-05-22 | Thomas Hebert | Multiple compressor common circuit structure design |
FR2909421A1 (en) * | 2006-12-04 | 2008-06-06 | Danfoss Commercial Compressors | Aspirating gas distributing device for compressor assembly, has two refrigeration compressors, and normalizing device normalizing flow of aspirating gas and arranged in distribution tube that is provided upstream of by-pass pipes |
US20080283133A1 (en) * | 2004-10-06 | 2008-11-20 | Hallowell International, Llc | Oil balance system and method for compressors connected in series |
US20130111935A1 (en) * | 2010-07-23 | 2013-05-09 | Carrier Corporation | High Efficiency Ejector Cycle |
US20130125569A1 (en) * | 2010-07-23 | 2013-05-23 | Carrier Corporation | Ejector Cycle |
US20130192294A1 (en) * | 2012-01-30 | 2013-08-01 | Jaeyoo YOO | Apparatus and method for controlling compressor, and refrigerator having the same |
US20130195678A1 (en) * | 2012-01-30 | 2013-08-01 | Jaeyoo YOO | Apparatus and method for controlling compressor, and refrigerator having the same |
US9051934B2 (en) | 2013-02-28 | 2015-06-09 | Bitzer Kuehlmaschinenbau Gmbh | Apparatus and method for oil equalization in multiple-compressor systems |
US20160047575A1 (en) * | 2013-03-25 | 2016-02-18 | Carrier Corporation | Compressor Bearing Cooling |
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 |
US10598416B2 (en) | 2013-11-04 | 2020-03-24 | Carrier Corporation | Refrigeration circuit with oil separation |
US10634137B2 (en) | 2012-07-31 | 2020-04-28 | Bitzer Kuehlmaschinenbau Gmbh | Suction header arrangement for oil management in multiple-compressor systems |
US10760831B2 (en) | 2016-01-22 | 2020-09-01 | Bitzer Kuehlmaschinenbau Gmbh | Oil distribution in multiple-compressor systems utilizing variable speed |
US20220056926A1 (en) * | 2020-08-24 | 2022-02-24 | Saudi Arabian Oil Company | Recovering waste oil |
US11479086B2 (en) * | 2016-08-22 | 2022-10-25 | Bergstrom, Inc. | Multi-compressor climate system |
US11780292B2 (en) | 2015-03-09 | 2023-10-10 | Bergstrom, Inc. | Graphical user interfaces for remotely managing climate control systems of a fleet of vehicles |
US11919364B2 (en) | 2018-04-02 | 2024-03-05 | Bergstrom, Inc. | Integrated vehicular system for conditioning air and heating water |
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Cited By (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3777509A (en) * | 1972-03-13 | 1973-12-11 | Borg Warner | Oil return system for refrigeration apparatus |
US4411141A (en) * | 1981-02-06 | 1983-10-25 | Mitsubishi Denki Kabushiki Kaisha | Parallel operation compressor type refrigerating apparatus |
FR2545580A1 (en) * | 1983-05-02 | 1984-11-09 | Puicervert Marc | Device for permanently keeping oil in the casings of compressors |
US4551989A (en) * | 1984-11-30 | 1985-11-12 | Gulf & Western Manufacturing Company | Oil equalization system for refrigeration compressors |
WO1990000710A1 (en) * | 1988-07-08 | 1990-01-25 | Olson Ref. - H Olson Refrigeration Ab | Device for controlling the supply of oil to a cooling and freezing plant |
US4910972A (en) * | 1988-12-23 | 1990-03-27 | General Electric Company | Refrigerator system with dual evaporators for household refrigerators |
US5109678A (en) * | 1989-01-03 | 1992-05-05 | General Electric Company | Apparatus for controlling a dual evaporator, dual fan refrigerator with independent temperature controls |
US4966010A (en) * | 1989-01-03 | 1990-10-30 | General Electric Company | Apparatus for controlling a dual evaporator, dual fan refrigerator with independent temperature controls |
US4918942A (en) * | 1989-10-11 | 1990-04-24 | General Electric Company | Refrigeration system with dual evaporators and suction line heating |
US5103650A (en) * | 1991-03-29 | 1992-04-14 | General Electric Company | Refrigeration systems with multiple evaporators |
US5134859A (en) * | 1991-03-29 | 1992-08-04 | General Electric Company | Excess refrigerant accumulator for multievaporator vapor compression refrigeration cycles |
US5236311A (en) * | 1992-01-09 | 1993-08-17 | Tecumseh Products Company | Compressor device for controlling oil level in two-stage high dome compressor |
US5375656A (en) * | 1992-10-14 | 1994-12-27 | Oil Dynamics, Inc. | Low flow rate oil supply system for an electric submersible pump |
US5899669A (en) * | 1996-03-19 | 1999-05-04 | Atlas Copco Airpower, Naamloze Vennootschap | Compressor device with vibration isolator |
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 |
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 |
WO2008081093A2 (en) * | 2006-12-04 | 2008-07-10 | Danfoss Commercial Compressors | Device for suction gas distribution in a parallel compressor assembly, and parallel compressor assembly |
WO2008081093A3 (en) * | 2006-12-04 | 2008-10-02 | Danfoss Commercial Compressors | Device for suction gas distribution in a parallel compressor assembly, and parallel compressor assembly |
FR2909421A1 (en) * | 2006-12-04 | 2008-06-06 | Danfoss Commercial Compressors | Aspirating gas distributing device for compressor assembly, has two refrigeration compressors, and normalizing device normalizing flow of aspirating gas and arranged in distribution tube that is provided upstream of by-pass pipes |
CN101627266B (en) * | 2006-12-04 | 2013-06-05 | 丹佛斯商业压缩机公司 | Device for suction gas distribution in a parallel compressor assembly, and parallel compressor assembly |
US20130111935A1 (en) * | 2010-07-23 | 2013-05-09 | Carrier Corporation | High Efficiency Ejector Cycle |
US20130125569A1 (en) * | 2010-07-23 | 2013-05-23 | Carrier Corporation | Ejector Cycle |
US9759462B2 (en) * | 2010-07-23 | 2017-09-12 | Carrier Corporation | High efficiency ejector cycle |
US9752801B2 (en) * | 2010-07-23 | 2017-09-05 | Carrier Corporation | Ejector cycle |
US9670933B2 (en) * | 2012-01-30 | 2017-06-06 | Lg Electronics Inc. | Apparatus and method for controlling compressor, and refrigerator having the same |
US9366246B2 (en) * | 2012-01-30 | 2016-06-14 | Lg Electronics Inc. | Apparatus and method for controlling compressor, and refrigerator having the same |
US20130195678A1 (en) * | 2012-01-30 | 2013-08-01 | Jaeyoo YOO | Apparatus and method for controlling compressor, and refrigerator having the same |
US20130192294A1 (en) * | 2012-01-30 | 2013-08-01 | Jaeyoo YOO | Apparatus and method for controlling compressor, and refrigerator having the same |
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 |
US10612549B2 (en) | 2012-07-31 | 2020-04-07 | Bitzer Kuehlmaschinenbau Gmbh | Oil equalization configuration for multiple compressor systems containing three or more compressors |
US9051934B2 (en) | 2013-02-28 | 2015-06-09 | Bitzer Kuehlmaschinenbau Gmbh | Apparatus and method for oil equalization in multiple-compressor systems |
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