USRE34297E - Refrigeration compressor - Google Patents
Refrigeration compressor Download PDFInfo
- Publication number
- USRE34297E USRE34297E US07/824,069 US82406992A USRE34297E US RE34297 E USRE34297 E US RE34297E US 82406992 A US82406992 A US 82406992A US RE34297 E USRE34297 E US RE34297E
- Authority
- US
- United States
- Prior art keywords
- shield
- rotor
- set forth
- refrigeration compressor
- compressor
- 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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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
- F25B31/02—Compressor arrangements of motor-compressor units
- F25B31/026—Compressor arrangements of motor-compressor units with compressor of rotary type
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/028—Means for improving or restricting lubricant flow
Definitions
- the present invention relates generally to refrigeration compressors and more specifically to such compressors incorporating shields for reducing the lubricating oil level in the area surrounding the rotating rotor.
- Typical refrigeration compressors incorporate a lubricant sump in the lower or bottom portion of the housing into which the drive shaft extends so as to pump lubricant therefrom to the various portions requiring lubrication.
- the lubricant also often acts to aid in removal of heat from the various components.
- the oil level extend above the rotating lower end of the rotor.
- the higher viscosity of the oil as compared to refrigerant gas creates an increased drag on rotation of the rotor resulting in increased power consumption. This problem is further aggravated in scroll type compressors which typically employ a counterweight secured to the lower end of the rotor.
- the present invention provides a shield which projects above the oil level in the sump and is positioned in surrounding relationship to the lower end of the rotor via a close fit with the drive shaft whereby the oil level in the area within the shield is reduced by the initial rotation of the rotor upon startup and return oil flow into this area is greatly restricted.
- a rotation inhibiting projection is provided on the shield while in another embodiment the shield is allowed to rotate with the drive shaft although the speed of rotation thereof will be substantially less than that of the drive shaft due to the drag exerted thereon by the lubricant.
- the power consumption of the motor is greatly reduced thus resulting in significant improvement in the operating efficiency of the compressor.
- FIG. 1 is a section view of a refrigeration compressor of the scroll type incorporating a shield surrounding the lower end of the motor rotor in accordance with the present invention, the section being taken along a radial plane extending along the axis of rotation of the drive shaft;
- FIG. 2 is a section view of the compressor of FIG. 1, the section being taken along line 2--2 thereof;
- FIG. 3 is a perspective view of the shield shown in FIGS. 1 and 2;
- FIG. 4 is a fragmentary section view similar to FIG. 1 but showing only a portion of the oil sump and an alternative embodiment of the shield, all in accordance with the present invention.
- FIG. 1 there is shown a hermetic refrigeration compressor 10 incorporating a shield 12 all in accordance with the present invention.
- Compressor 10 comprises an outer shell or housing 14 within the lower portion of which is disposed an electric motor 16 including a stator 20 and a rotor 22.
- Motor 16 is operative to drive a compressor assembly 24 disposed in the upper portion of shell 14 via a drive shaft 26 extending therebetween and to which rotor 22 is secured adjacent the lower end.
- compressor assembly 24 is of the scroll type and incorporates an upper fixed scroll member 28 and a lower scroll member 30 which is driven by drive shaft 26 in orbiting motion relative to the fixed scroll member 28.
- Drive shaft 26 is rotatably supported within shell 14 by means of upper and lower bearing assemblies 32 and 34 respectively each of which are fixedly secured to shell 14.
- Compressor 10 is described in greater detail in presently pending application Ser. No. 899,003 filed Aug. 22, 1986 entitled "Scroll Type Machine With Axially Compliant Mounting" assigned to the same assignee as the present application, the disclosure of which is hereby incorporated by reference.
- the lower portion of shell 14 defines a lubricant sump 36 containing a supply of oil for lubrication of the various components of compressor 10 as well as augmenting cooling thereof.
- oil level 38 extends above the lower ends of the end turns 40 of stator 20 and both a counterweight 42 and the lower end portion 44 of rotor 22 to which counterweight 42 is secured.
- Shield 12 is preferably formed as a one piece structure from a suitable polymeric composition such as a nylon material for example. It should be noted that other materials may be utilized so long as they are able to resist degradation from both the oil and refrigerant utilized in the system as well as the heat generated during operation of compressor 10. It should also be noted that the use of a dielectric non-magnetic material is believed preferable due to the proximity of the shield to the motor rotor and stator and the desire to avoid any interference with the operation thereof.
- shield 12 incorporates a first generally cylindrically shaped portion 46 open at the upper end thereof and positioned in surrounding relationship to lower end portion 44 of rotor 22 and associated counterweight 42.
- Cylindrical portion 46 extends axially upwardly between rotor 22 and the end turns 40 of stator 20 to a height just slightly above maximum normal oil level 38.
- a lower hollow generally cylindrically shaped portion 48 extends axially downwardly therefrom in relatively closely spaced relationship to shaft 26 and includes an annular radially inwardly extending flange portion 50 which is received within a reduced diameter portion 51 of shaft 26.
- a radially extending annular flange portion 52 extends between and interconnects cylindrical portions 46 and 48.
- a generally flat flange portion 54 is integrally formed on shield 12 extending axially downwardly from the lower surface of flange portion 52 and generally radially outwardly from cylindrical portion 48.
- Leg 56 extends axially downwardly from flange portion 54 and is received between a pair of support legs 58, 60 forming a part of lower bearing assembly 34 and cooperates therewith to restrict rotational movement of shield 12.
- shield 12 will operate to effectively reduce the drag on rotor rotation due to its partial immersion into the oil in the lubricant sump and thereby eliminate the resulting power consumption.
- the clearance between cylindrical portion 48 and shaft 26 is sufficient to avoid any excessive wear or drag on shield 12 but yet small enough to enable shaft 26 to effectively maintain shield 12 and particularly upper cylindrical portion 46 thereof the desired substantially coaxial position with respect to rotor 22 so as to avoid the possibility of contact therebetween.
- shield 64 in accordance with the present invention is shown in operative relationship to a motor assembly 66 and associated drive shaft 68 of a refrigeration compressor 70.
- Shield 64 is virtually identical to shield 12 with the exception that flange portion 54 and associated leg 56 have been deleted therefrom. Accordingly, corresponding portions of shield 64 have been indicated by like numbers primed. Because shield 64 does not incorporate any means to prevent relative rotation thereof, the viscous drag resulting from the oil disposed between cylindrical portion 48' and shaft 66 will result in rotational movement thereof. However, this rotation will be substantially slower than the speed of rotation of drive shaft 66 because of the viscous drag exerted on shield 64 by the oil within sump 36'. Hence, it is believed only a slight stirring of the oil within sump 36' will occur as shield 64 is allowed to rotate which stirring may be beneficial to aid in cooling of the lower end turns of stator 20'.
- shields 12 and 64 may be easily and inexpensively formed in any suitable manner such as injection molding or the like and further enable the overall height of the motor compressor to be kept to a minimum.
Abstract
Description
Claims (25)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/824,069 USRE34297E (en) | 1988-06-08 | 1992-01-23 | Refrigeration compressor |
US07/996,382 USRE37019E1 (en) | 1988-06-08 | 1992-12-23 | Refrigeration compressor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/204,091 US4895496A (en) | 1988-06-08 | 1988-06-08 | Refrigeration compressor |
US07/824,069 USRE34297E (en) | 1988-06-08 | 1992-01-23 | Refrigeration compressor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/204,091 Reissue US4895496A (en) | 1988-06-08 | 1988-06-08 | Refrigeration compressor |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/204,091 Continuation US4895496A (en) | 1988-06-08 | 1988-06-08 | Refrigeration compressor |
US07/995,185 Continuation-In-Part US5314403A (en) | 1992-04-24 | 1992-12-22 | Apparatus for the enhancement of the enjoyment of the extremely low frequency component of music |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE34297E true USRE34297E (en) | 1993-06-29 |
Family
ID=26899171
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/824,069 Expired - Lifetime USRE34297E (en) | 1988-06-08 | 1992-01-23 | Refrigeration compressor |
US07/996,382 Expired - Lifetime USRE37019E1 (en) | 1988-06-08 | 1992-12-23 | Refrigeration compressor |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/996,382 Expired - Lifetime USRE37019E1 (en) | 1988-06-08 | 1992-12-23 | Refrigeration compressor |
Country Status (1)
Country | Link |
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US (2) | USRE34297E (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6585496B1 (en) | 2002-01-24 | 2003-07-01 | Scroll Technologies | Self-regulating oil reservoir for scroll compressor |
US20040057849A1 (en) * | 2002-09-23 | 2004-03-25 | Skinner Robin G. | Compressor assembly having baffle |
US20040057837A1 (en) * | 2002-09-23 | 2004-03-25 | Skinner Robin G. | Compressor having alignment bushings and assembly method |
US20040057859A1 (en) * | 2002-09-23 | 2004-03-25 | Haller David K. | Compressor having bearing support |
US20040057845A1 (en) * | 2002-09-23 | 2004-03-25 | Skinner Robin G. | Compressor mounting bracket and method of making |
US6896496B2 (en) | 2002-09-23 | 2005-05-24 | Tecumseh Products Company | Compressor assembly having crankcase |
US7018183B2 (en) | 2002-09-23 | 2006-03-28 | Tecumseh Products Company | Compressor having discharge valve |
US7063523B2 (en) | 2002-09-23 | 2006-06-20 | Tecumseh Products Company | Compressor discharge assembly |
US7094043B2 (en) | 2002-09-23 | 2006-08-22 | Tecumseh Products Company | Compressor having counterweight shield |
US7717687B2 (en) | 2007-03-23 | 2010-05-18 | Emerson Climate Technologies, Inc. | Scroll compressor with compliant retainer |
US20130052069A1 (en) * | 2011-08-29 | 2013-02-28 | Sanyo Electric Co., Ltd. | Scroll compressor |
US20130052068A1 (en) * | 2011-08-31 | 2013-02-28 | Sanyo Electric Co., Ltd. | Scroll compressor |
US11261867B2 (en) * | 2017-01-11 | 2022-03-01 | Mitsubishi Electric Corporation | Compressor comprising a compression mechanism driven by a main shaft having a balance weight comprising an annular oil-receiving recessed portion communicating with a part of a hollow portion of the balance weight |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4579256B2 (en) * | 2007-01-04 | 2010-11-10 | トヨタ自動車株式会社 | Vehicle drive device mounting structure |
DE102008051320B4 (en) * | 2008-10-11 | 2012-06-21 | Secop Gmbh | Refrigerant compressor |
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US1614676A (en) * | 1922-02-04 | 1927-01-18 | Arthur J Kercher | Refrigerating apparatus |
US1797287A (en) * | 1921-10-22 | 1931-03-24 | Westinghouse Electric & Mfg Co | Refrigerating machine |
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-
1992
- 1992-01-23 US US07/824,069 patent/USRE34297E/en not_active Expired - Lifetime
- 1992-12-23 US US07/996,382 patent/USRE37019E1/en not_active Expired - Lifetime
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US1614676A (en) * | 1922-02-04 | 1927-01-18 | Arthur J Kercher | Refrigerating apparatus |
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