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Publication numberUS3853433 A
Publication typeGrant
Publication dateDec 10, 1974
Filing dateMar 25, 1974
Priority dateSep 6, 1972
Publication numberUS 3853433 A, US 3853433A, US-A-3853433, US3853433 A, US3853433A
InventorsRoberts J, Temp G
Original AssigneeTrane Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Refrigeration compressor defining oil sump containing an electric lubricant pump
US 3853433 A
Abstract
A compression cycle refrigeration system is shown having a two-stage direct-drive hermetic centrifugal compressor. The thrust bearing for the compressor impeller is mounted remote from the impeller for easy inspection and service. The centrifugal compressor housing defines a lubricant pump incorporating an electric motor driven lubricant pump.
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United States Patent [191 Roberts et al.

[ 1 Dec. 10, 1974 [75] Inventors: John H. Roberts; Gordon L. Temp,

both of La Crosse, Wis.

[73] Assignee: The Trane Company, La Crosse,

Wis.

[22] Filed: Mar. 25, 1974 [21] App]. No.: 454,304

Related US. Application Data [63] Continuation of Ser. No. 286,806, Sept. 6, 1972,

2,888,193 /1959 Greenwald 417/423 3,005,518 /1961 Jassniker 184/6 3,118,384 l/1964 Sence et al. 417/423 3,163,999 1/1965 Ditzler et al.. 62/469 3,221,984 12/1965 Ditzler 417/423 3,225,698 12/1965 Spisiak 419/423 3,240,424 3/1966 Richardson 417/423 3,637,048 1/1972 Mount 184/6.1

Primary Examiner-C. J. Husar 5 7 ABSTRACT A compression cycle refrigeration system is shown having a two-stage direct-drive hermetic centrifugal compressor. The thrust bearing for the compressor impeller is mounted remote from the impeller for easy inspection and service. The centrifugal compressor housing defines a lubricant pump incorporating an electric motor driven lubricant pump.

4 Claims, 1 Drawing Figure abandoned.

[52] US. Cl 417/423, 62/469, 184/6 [51] Int. Cl F04b 17/00 [58] Field of Search 417/423; 184/6 C, 6 L; 62/469 [5 6] References Cited UNITED STATES PATENTS 2,020,678 11/1935 Estler 184/6 1 as 78 a2 86 s4 3T 1 3 6 33 a 1 3g 2g T so REFRIGERATION COMPRESSOR DEFINING OIL SUMP CONTAINING AN ELECTRIC LUBRICANT PUMP This is a continuation of application Ser. No. 286,806, filed Sept. 6, 1972, now abandoned.

SUMMARY OF THE INVENTION This invention relates to centrifugal compressors for a refrigeration machine. More particularly this invention relates to a lubrication system for such a coinpressor in which the eye of the compressor inlet and the compressor housing together define a substantially annular chamber containing housing an electric motor driven lubricant pump. The chamber functions as a lubricant sump from which the lubricant is withdrawn by the pump and delivered to the compressor bearings. The chamber is vented to compressor suction inlet for removal of refrigerant vapors from the lubricant sump.

Other aspects and advantages will be apparent as this specification describes the invention in detail with reference to the drawing in which the sole FIGURE shows a vertical section of a centrifugal refrigerant compressor incorporating the invention and schematically connected in a refrigeration system.

Now with reference to the drawing it will be seen that the refrigeration system has a centrifugal refrigerant compressor 12 connected to discharge compressed refrigerant into a refrigerant condenser 14 which may be cooled by water as at 13. The condensed refrigerant then passes through a flow control 16 which may be in the form of a float or other device for regulating the flow of condensed refrigerant to a refrigerant evaporator 18, the heat for evaporation being provided by the refrigeration system load 19. The vaporized refrigerant is returned to the suction side of the compressor.

The compressor 12 has a compressor housing 24 including a motor portion 26 and a compressor portion 28. Motor potion 26 is provided with a pair of spaced bearings 30 and 32 which rotatably support a compressor drive shaft 34. Mounted for rotation with shaft 34 between bearings 30 and 32 is a motor rotor 36 operatively associated with motor stator 38 of compressor motor 37 supported within portion 26 of housing 24.

One end of drive shaft 34 extends beyond bearing 32 into the compressor portion 28 of housing 24. First and second stage centrifugal fluid impellers 40 and 42 respectively are mounted at this end of shaft 34 which is cantilevered beyond bearing 32. Impellers 40 and 42 are appropriately rigidly secured to shaft 34 for rotation therewith. The impellers 40 and 42 are surrounded by the compressor stator members 44 fixedly secured within portion 28 of housing 24 which defines diffuser passages for receiving fluid from each of the impellers and an interstage passage for conveying fluid from the first stage diffuser to the inlet of the second stage impeller. This interstage passage has a plurality of circumferentially spaced second stage inlet guide vanes 46 which are adjustable through a linkage 48 and guide vane control shaft 50. An annular inlet member 52 is disposed within housing 24 for conducting fluid from the suction line to the inlet of the first stage impeller 40. Annular inlet member 52 contains a plurality of circumferentially spaced first stage inlet guide vanes 54 which are adjustable through linkage 56 and guide vane control shaft 50.

The annular cavity defined between housing portion 28 and inlet member 52 serves as a lubrication system sump 22 in addition to providing space for linkage 56. Oil return lines 58 are connected to drain lubricating oil from bearings 30 and 32 to sump 22.

The lower portion of housing portion 28 is provided with an aperture 60 which is closed by aremovable cover plate 62. Connected at the inner side of plate 62 is a lubricant pump 64 positioned to receive lubricant from the lower portion of sump 22 through an inlet 66 and from whence lubricant is discharged under pressure to bearings 30 and 32 through lubricant supply lines 68. Pump 64 is driven by an electric motor 70 also supported on the inner side of plate 62 within the annular cavity between housing 24 and inlet member 52. This cavity is further provided with a vent 72 to the first stage impeller inlet downstream of inlet control vanes 54 through a standpipe 74. Standpipe 74 effectively places the vent for sump 22 at the upper most location so that even if there be foaming of lubricant within sump 22, such foam is unlikely to reach an elevation sufficient to allow oil to enter the top of standpipe 74. Oil is also prevented from passing through the annular space between impeller 40 and inlet guide member 52 by reason of an O-ring seal 76.

During operation of the system, the impellers 40 and 42 exert a net axial force on shaft 34 due to the unbalance of pressures on opposite sides of the impellers as dictated by the location of seals associated therewith as at 29, 33, and 35. In the particular impeller arrangement shown, this force would be to the right. To oppose this force shaft 34 is provided with an annular thrust plate 78 which is secured to shaft 34 for rotation therewith as bythrust plate retainer nut 80. Thus during operation of the compressor thrust plate 78 is caused to bear against a plurality of circumferentially spaced thrust pads 82 pivotly supported on a flat annular face 84 within the member defining bearing 30 adjacent the other end of shaft 34 opposite from the end supporting impellers 40 and 42. The thrust bearing 81 formed by plate 78 and pads 82 is lubricated by lubricant overflow from bearing 30. A shoulder on shaft 34 in abutment with the end of bearing 30 as at 31 limits movement of the shaft to the left such as may occur during shipment. The compressor motor is provided with a seal 86 between bearing 30 and motor 37, to maintain the bearing lubricant separate from the cooling medium (usually refrigerant) within the motor. The lubricant supply and drain lines 68 and 58 are provided with shutoff valves 88. By closing valves 88 and removing bearing cover plate 90, thrust bearing 81 may be inspected and replaced if necessary. During this period when plate 90 is removed seal 86 will minimize leakage between the compressor motor and the atmosphere.

Having now described the preferred embodiment of the invention, it is contemplated that many changes may be made without departing from the scope or spirit of the invention as limited only by the claims.

We claim:

1. A refrigerant centrifugal compressor comprising: a compressor housing; a shaft disposed within said housing; bearing means for rotatably supporting said shaft in said housing; a centrifugal type fluid impeller disposed within said housing and mounted for rotation with said shaft; an annular inlet member disposed within said housing to conduct fluid to the inlet of said impeller and coaxially arranged with respect to said shaft; a plurality of inlet control vanes disposed in said inlet member; portions of said inlet member being radially inwardly spaced from said housing thereby defining a substantially annular cavity between and axially coextensive with said compressor housing and said inlet member; a lubrication system for said compressor including first conduit means for conducting lubricant to said bearing means; and second conduit means for draining lubricant from said bearing means to said annular cavity whereby said annular cavity defines a lubricant sump; means for mechanically adjusting said control vanes disposed within said cavity; passage means for venting the upper portion of said cavity to the inlet of said compressor; and pressurizing means for said annular cavity.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2020678 *Dec 18, 1930Nov 12, 1935Chicago Pneumatic Tool CoApparatus for lubrication
US2888193 *Feb 14, 1957May 26, 1959Garrett CorpMotor driven compressor
US3005518 *Nov 26, 1958Oct 24, 1961Sulzer AgTurbomachine plant, including a closed lubricating, cooling, and sealing fluid circuit
US3118384 *Aug 3, 1961Jan 21, 1964 Bearings for motor pump units
US3163999 *Aug 1, 1962Jan 5, 1965Westinghouse Electric CorpCentrifugal compressor lubricating and motor cooling systems
US3221984 *Apr 16, 1964Dec 7, 1965Westinghouse Electric CorpOil supply systems for refrigerant compressors
US3225698 *Nov 29, 1963Dec 28, 1965Buffalo Forge CoHermetic motor-pump construction
US3240424 *Jul 1, 1964Mar 15, 1966Westinghouse Electric CorpOil supply systems for refrigerant compressors
US3637048 *Sep 22, 1969Jan 25, 1972Carrier CorpAuxiliary lubricating system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4989403 *May 23, 1988Feb 5, 1991Sundstrand CorporationSurge protected gas turbine engine for providing variable bleed air flow
US5313779 *Dec 7, 1989May 24, 1994Sundstrand CorporationSurge protected gas turbine engine for providing variable bleed air flow
US5355691 *Aug 16, 1993Oct 18, 1994American Standard Inc.Control method and apparatus for a centrifugal chiller using a variable speed impeller motor drive
US5404964 *Oct 28, 1992Apr 11, 1995Carrier CorporationSystem for reducing oil migration from a transmission
US5537830 *Nov 28, 1994Jul 23, 1996American Standard Inc.In a water chiller system
US5553997 *Jan 16, 1996Sep 10, 1996American Standard Inc.Control method and apparatus for a centrifugal chiller using a variable speed impeller motor drive
US5555956 *May 27, 1994Sep 17, 1996Nartron CorporationLow capacity centrifugal refrigeration compressor
US5685699 *Jun 20, 1996Nov 11, 1997Carrier CorporationCompressor transmission vent system
US6039534 *Sep 21, 1998Mar 21, 2000Northern Research And Engineering CorpInlet guide vane assembly
US6185944Feb 5, 1999Feb 13, 2001Midwest Research InstituteRefrigeration system with a compressor-pump unit and a liquid-injection desuperheating line
US6290467Dec 3, 1999Sep 18, 2001American Standard International Inc.Centrifugal impeller assembly
US6454541 *Oct 11, 2000Sep 24, 2002Nippon Shokubai Co., Ltd.Method for transferring easily-polymerizable substance
US7407367 *Apr 18, 2005Aug 5, 2008Hamilton Sundstrand CorporationVariable area diffuser
US7704056Sep 19, 2008Apr 27, 2010Honeywell International Inc.Two-stage vapor cycle compressor
US8833102 *Jul 16, 2010Sep 16, 2014Ihi CorporationTurbo compressor and refrigerator
US20110016913 *Jul 16, 2010Jan 27, 2011Minoru TsukamotoTurbo compressor and refrigerator
US20110016914 *Jul 16, 2010Jan 27, 2011Kentarou OdaTurbo compressor and refrigerator
EP1321680A2 *Dec 12, 2002Jun 25, 2003Miscel OyTurbo machine
WO1989011589A1 *Apr 12, 1989Nov 30, 1989Sundstrand CorpSurge protected gas turbine engine for providing variable bleed air flow
WO2014108523A1 *Jan 13, 2014Jul 17, 2014Thermodyn SasCompressor unit with a variable aerodynamic profile
Classifications
U.S. Classification417/423.13, 184/6, 415/160, 62/469
International ClassificationF04D25/06, F25B1/053, F25B1/04, F04D25/02, F04D29/04, F04D17/00, F04D17/12, F04D29/05, F04D29/057
Cooperative ClassificationF04D29/057, F25B1/053, F04D25/0606, F04D17/125
European ClassificationF04D29/057, F04D25/06B, F04D17/12B2, F25B1/053
Legal Events
DateCodeEventDescription
Nov 14, 1997ASAssignment
Owner name: AMERICAN STANDARD, INC., NEW JERSEY
Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:008869/0001
Effective date: 19970801
Nov 13, 1997ASAssignment
Owner name: AMERICAN STANDARD, INC., NEW JERSEY
Free format text: RELEASE OF SECURITY INTEREST (RE-RECORD TO CORRECT DUPLICATES SUBMITTED BY CUSTOMER. THE NEW SCHEDULE CHANGES THE TOTAL NUMBER OF PROPERTY NUMBERS INVOLVED FROM 1133 TO 794. THIS RELEASE OF SECURITY INTEREST WAS PREVIOUSLY RECORDED AT REEL 8869, FRAME 0001.);ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:009123/0300
Effective date: 19970801
Jun 2, 1993ASAssignment
Owner name: CHEMICAL BANK, AS COLLATERAL AGENT, NEW YORK
Free format text: ASSIGNMENT OF SECURITY INTEREST;ASSIGNOR:BANKERS TRUST COMPANY, AS COLLATERAL TRUSTEE;REEL/FRAME:006565/0753
Effective date: 19930601
Jun 28, 1988ASAssignment
Owner name: BANKERS TRUST COMPANY
Free format text: SECURITY INTEREST;ASSIGNOR:AMERICAN STANDARD INC., A DE. CORP.,;REEL/FRAME:004905/0035
Owner name: BANKERS TRUST COMPANY, 4 ALBANY STREET, 9TH FLOOR,
Free format text: SECURITY INTEREST;ASSIGNOR:TRANE AIR CONDITIONING COMPANY, A DE CORP.;REEL/FRAME:004905/0213
Effective date: 19880624
Owner name: BANKERS TRUST COMPANY, NEW YORK
Dec 7, 1985AS03Merger
Owner name: A-S SALEM INC.
Owner name: AMERICAN STANDARD INC., A CORP OF DELAWARE
Owner name: TRANE COMPANY THE
Effective date: 19841226
Dec 7, 1985ASAssignment
Owner name: AMERICAN STANDARD INC., A CORP OF DELAWARE
Free format text: MERGER;ASSIGNORS:TRANE COMPANY THE;A-S SALEM INC.;REEL/FRAME:004508/0684
Effective date: 19841226
Oct 7, 1985ASAssignment
Owner name: A-S CAPITAL INC.
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Effective date: 19840224
Jul 5, 1985ASAssignment
Owner name: A-S CAPITAL INC., A CORP OF DE
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Effective date: 19840224
Feb 14, 1985ASAssignment
Owner name: AMERICAN STANDARD INC., A CORP OF DE
Free format text: MERGER;ASSIGNORS:TRANE COMPANY, THE;A-S SALEM INC., A CORP. OF DE (MERGED INTO);REEL/FRAME:004372/0349
Effective date: 19841226
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Free format text: MERGER;ASSIGNORS:TRANE COMPANY THE, A CORP OF WI (INTO);A-S CAPITAL INC., A CORP OF DE (CHANGED TO);REEL/FRAME:004372/0370
Effective date: 19840224
Aug 13, 1984ASAssignment
Owner name: TRANE COMPANY, THE
Free format text: MERGER;ASSIGNOR:A-S CAPITAL INC. A CORP OF DE;REEL/FRAME:004334/0523