US3684412A - Oil separator for rotary compressor - Google Patents

Oil separator for rotary compressor Download PDF

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Publication number
US3684412A
US3684412A US79790A US3684412DA US3684412A US 3684412 A US3684412 A US 3684412A US 79790 A US79790 A US 79790A US 3684412D A US3684412D A US 3684412DA US 3684412 A US3684412 A US 3684412A
Authority
US
United States
Prior art keywords
shell
oil
chamber
gas
discharge
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
Application number
US79790A
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English (en)
Inventor
Lester E Harlin
Dwight L Tothero
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Borg Warner Corp
Original Assignee
Borg Warner Corp
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Filing date
Publication date
Application filed by Borg Warner Corp filed Critical Borg Warner Corp
Application granted granted Critical
Publication of US3684412A publication Critical patent/US3684412A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F04C29/026—Lubricant separation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S418/00—Rotary expansible chamber devices
    • Y10S418/01—Non-working fluid separation

Definitions

  • An oil coalescing medium extends across and adjacent an end of the shell dividing the shell into large and small chambers with the compressor casing located entirely within the large chamber.
  • the coalescing medium confines the turbulent volume of the refrigerant-oil mixture in the large chamber so that the oil impinges on the shell and medium and separates from the gas and collects in the shell bottom while the gas passes through the medium and into the small chamber.
  • a discharge line has its entrance disposed in the top of the small chamber so that it is isolated from the turbulent movement of the oil-refrigerant mixture in the large chamber.
  • lubricating oil is generally provided in the compressor casing for lubricating the moving components of the compressor and for sealing purposes between the high and low pressure 7 sides of the compressor.
  • refrigerant gas is compressed by the compressor and is then discharged into a hollow shell enclosing the compressor. Since the internal operating components of the compressor are sealed with oil, the refrigerant gas is heavily laden with oil when it is discharged into the shell. It is necessary to remove the oil entrained in the gas, because substantial quantities of oil flowing out with the refrigerant reduces the heat transfer in the condenser and evaporator; and, in addition, renders it difficult to supply a sufficient amount of oil to the compression chamber to attain the necessary sealing between the rotor and chamber surfaces.
  • the present invention is an improvement of the oil separator arrangement for a rotary compressor disclosed in the Harlin patent and is particularly directed to a simple and novel modification of this oil separator resulting in significant performance differences.
  • the oil-coalescing medium similarly partitions the shell into large and small chambers as in the Hardin patent
  • the refrigerant, compressed by the compressor, and heavily laden with oil is discharged directly into the large chamber causing oil separation to be considerably facilitated by the substantial and drastic velocity drop of the refrigerant and oil mixture entering the large shell volume, and also by impingement of the gas and oil on the extensive surface area of the shell, and, thereafter, by the coalescing of the oil droplets in the oil separator medium when the gas flows from the large chamber through the oil separator medium into the small chamber.
  • the gas then flows into the entrance of a discharge tube located in the small chamber and through the tube to the exterior of the compressor.
  • the coalescing medium is instrumental in isolating the tube entrance from the turbulent movement of the refrigerant-oil mixture in the large chamber.
  • the oil collects in the bottom of the shell which serves as an oil sump and then returns through a pickup tube to lubricate and seal the compressor.
  • the tube+s entrance is located at the top of the small chamber.
  • Another object of the invention is to provide an oil separator for a rotary compressor and having an improved arrangement for recovering oil from the oilladen refrigerant gas discharged from the compressor for use in lubricating and sealing the compressor.
  • a specific object of the invention is to provide an improved oil separator for use in a rotary compressor and in which the compressed oil-laden refrigerant gas is discharged into a comressor-enclosing shell having a large volume to provide a substantial and drastic velocity drop of the mixture effective to separate the oil from the gas; further separation occurring upon impingement of the mixture on an extensive surface area of the shell; then passing the gas through an oil coalescing medium to coalesce oil droplets, the coalescing medium being also arranged to isolate the entrance of a discharge tube, located at the top of the compressor, from the turbulent movement of the gas and oil mixture in the shell.
  • FIG. 1 is a view, with portions broken away and partly in cross-section, of a compressor showing the improved oil'separator constructed in accordance with the present invention.
  • FIG. 2 is a cross-section view taken along the plane ofline 2-2 in FIG. 1.
  • the compressor constructed in accordance with the principles of the present invention comprises a generally cylindrical housing A containing the rotor assembly B, a hermetic shell C surrounding the compressor and attached to the front bearing plate providing one part of the housing.
  • the compressor housing A includes a casing 10 having a cylindrical bore 12 extending therethrough, a front bearing plate 14, and a rear bearing plate 16 all secured by cap screws 17.
  • the rotor assembly B is received within the casing bore 12 and includes a slotted rotor 20 which carries a plurality of substantially radially extending and reciprocating vanes 22.
  • the axis of rotor 20 is ofi'set or eccentrically arranged with respect to the axis of the bore 12 so that the bore, the front bearing plate 14, the rear baring plate 16, and the rotor 20 cooperate to provide a crescent-shaped compression chamber or cavity 24.
  • Rotor 20 is driven by shaft 28 journaled in a bearing 30 supported by the rear bearing plate 16 in recessed portion 32 and a bearing 34 supported by the front bearing plate 14.
  • Suction gas from the evaporator (not shown) is admitted to a passage 35 formed in the front bearing plate 14.
  • Both the front bearing plate and the rear bearing plate are provided with generally crescent shaped recesses 36 (only one of which is shown in FIG. 2) to admit the suction gas into the suction stage of the compressor cavity 24.
  • the recesses are fluidly interconnected by a channel 37 in the casing body 10.
  • a discharge valve assembly 38 is located in the discharge zone for assuring proper compression of the gases issuing from the outlet or discharge ports 39 and for preventing reverse flow of gases back into the compression chamber.
  • the valve assembly 38 is of the reed type and comprises the valve reed 40 held in place by a valve guard or stop 41.
  • the oil separator arrangement includes an element D formed of gas permeable material 42, for example, one made of coarse mesh metal fibers, such as used in a scouring pad, held between retainers or support members 43.
  • the support members 43 comprise a pair of screen-like elements fabricated from heavy metal wire.
  • the periphery of the element D has the same contour as that of the shell so that its edges fit against the internal diameter of the shell, the shell being connected to the periphery of the front bearing plate by a series of cap screws 44 to provide a fluid-tight connection between the shell and the front bearing plate.
  • the element D is secured in spaced relation to the compressor by cap screws 45 attached to bosses 46 extending axially from the rear bearing plate 16 and providing a partition separating the space enclosed by the shell into a large chamber 47 and a small chamber 48, the larger chamber enclosing the compressor housing A so that it is located entirely within the large chamber.
  • the compressor housing A is provided with a gas discharge tube or conduit 49 extending within and forming a continuation of an axially extending passage 50 in the top of the rear plate 16, casing and front plate 14, the passage terminating in a fitting 51 on the front plate for flow of gas from the compressor to a condenser (not shown).
  • the tube 49 also extends through a portion of chamber 47 and through element D, having its entrance end 49a disposed within the small chamber 48 so that gas from chamber A must pass through the oil-coalescing material of element D before entering chamber 48 for upward flow into the gas discharge tube 49.
  • Oil collects in a sump portion 52 in the lower portion of the shell and is circulated through a lubrication system. Oil is caused to flow through a pick-up tube 53 having a strainer 54 to a series of passages in the front and rear bearing plates and the casing body.
  • the oil separator of the present invention provides a simplified and improved arrangement having performance advantages readily apparent in the light of the following description of the operation of the oil separator.
  • the hot discharge gas passes from the discharge valve assembly 38 and flows into the large chamber 47. Since the internal running parts of the compressor are sealed with oil, the refrigerant gas is heavily laden with oil when it is discharged at high velocity into chamber 47.
  • a novel and important feature of the arrangement is that, due to the substantially large shell volume defining the chamber 47, a drastic velocity drop of the refrigerant and oil mixture occurs to slow down the velocity of the gas, although considerable turbulence 18 had in the vicinity of the gas-permeable element D but which subsides to a low value.
  • Oil separation is not only achieved rapidly by the velocity drop of the mixture, but by impingement of the gas and oil on the substantially larger surface area of the shell, and by the coalescing of oil droplets in the gas-permeable material 42 of the element D. Since the element D separates the chambers 47 and 48, the element also isolates the entrance 49a of the discharge tube 49 from the turbulent movement of the refrigerant-oil mixture in the chamber 47. Furthermore, all of the gas must pass from chamber 47 through the element D to chamber 48 so that additional amounts of oil are separated from the gas prior to flow of the gas into the discharge tube 49. After passing through the element D, the gas also strikes the end wall of the shell and reverses direction such that some of any remaining oil adheres to the wall and flows down to the sump. Passage of oil from chamber 48 into the discharge tube 49 is minimized as the entrance of the tube 49 is disposed at the top of the chamber 48 in a position remote from the level of the oil collected in the chamber 49.
  • a refrigerant compressor comprising a housing having a compression cavity formed therein; suction and discharge ports communicating with said cavity; a rotor in said compression cavity adapted to compress a refrigerant fluid introduced through said suction port and discharge said fluid, together with a liquid lubricant entrained therewith, through said discharge port at a higher pressure; a closed shell having a generally circular cross-section enveloping said housing and spaced therefrom to provide a substantially annular fluid passage between the inside surface of said shell and the outside surface of said housing, said shell having an end wall axially spaced from said housing, said discharge port being located with respect to said shell to deliver the discharge gas directly from said discharge port against the inside surface of said shell whereby a portion of any lubricant entrained in said discharge gas coalesces on said inside surface; a gas permeable coalescing medium arranged within said shell and having its marginal edges closely conforming with the inside diameter of said shell, said coalescing medium being spaced from the end of said shell to provide a partition

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
  • Rotary Pumps (AREA)
US79790A 1970-10-12 1970-10-12 Oil separator for rotary compressor Expired - Lifetime US3684412A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7979070A 1970-10-12 1970-10-12

Publications (1)

Publication Number Publication Date
US3684412A true US3684412A (en) 1972-08-15

Family

ID=22152825

Family Applications (1)

Application Number Title Priority Date Filing Date
US79790A Expired - Lifetime US3684412A (en) 1970-10-12 1970-10-12 Oil separator for rotary compressor

Country Status (7)

Country Link
US (1) US3684412A (fr)
JP (1) JPS5545755B1 (fr)
AU (1) AU459890B2 (fr)
CA (1) CA937550A (fr)
DE (1) DE2148741A1 (fr)
FR (1) FR2111273A5 (fr)
GB (1) GB1354582A (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4269576A (en) * 1978-07-29 1981-05-26 Diesel Kiki Co., Ltd. Vane compressor with reticulate or porous separator element and fluid guide means therein
US4279578A (en) * 1979-05-21 1981-07-21 Borg-Warner Corporation Compact oil separator for rotary compressor
US4295806A (en) * 1978-05-26 1981-10-20 Mitsubishi Denki Kabushiki Kaisha Rotary compressor with wire gauze lubricant separator
US4470778A (en) * 1980-11-10 1984-09-11 Sanden Corporation Scroll type fluid displacement apparatus with oil separating mechanism
US5494412A (en) * 1993-04-26 1996-02-27 Goldstar Co., Ltd. Oil delivery prevention device for horizontal type rotary compressor
US5536153A (en) * 1994-06-28 1996-07-16 Edwards; Thomas C. Non-contact vane-type fluid displacement machine with lubricant separator and sump arrangement
US20040033151A1 (en) * 2001-11-20 2004-02-19 Jae-Sool Shim Compressor having oil returning apparatus
US20040115081A1 (en) * 2002-01-25 2004-06-17 Seiko Instruments Inc. Gas compressor
US20050129536A1 (en) * 2003-12-10 2005-06-16 Shinichi Ohtake Compressor
US20050129556A1 (en) * 2003-12-10 2005-06-16 Kiyofumi Ito Compressor
US20050226756A1 (en) * 2004-04-13 2005-10-13 Sanden Corporation Compressor
US20050271534A1 (en) * 2004-06-08 2005-12-08 Sanden Corporation Scroll compressor and air-conditioning system for vehicle using the scroll compressor
US20060065012A1 (en) * 2004-09-28 2006-03-30 Sanden Corporation Compressor
US20060067846A1 (en) * 2003-09-26 2006-03-30 Atsuo Okaichi Compressor
US7314355B2 (en) 2004-05-27 2008-01-01 Sanden Corporation Compressor including deviated separation chamber
US11054178B2 (en) 2017-11-15 2021-07-06 Vilter Manufacturing Llc Crankcase oil separation for high pressure reciprocating compressors
US11859603B2 (en) 2018-10-02 2024-01-02 Copeland Industrial Lp 3D-printed oil separation for reciprocating compressors

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2815471C2 (de) * 1978-04-10 1986-05-07 Robert Bosch Gmbh, 7000 Stuttgart Verdichter, insbesondere Kältemittelverdichter
GB2119443A (en) * 1982-04-24 1983-11-16 Gen Eng Radcliffe 1979 An oil sealed pump
JPS59141742U (ja) * 1983-09-06 1984-09-21 ヤンマー農機株式会社 脱穀装置
EP0237501B1 (fr) * 1986-03-10 1991-10-16 CORINT S.r.l. Pompes à palettes pneumatiques avec lubrification et fonctionnement intermittent

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US346038A (en) * 1886-07-20 Trap for ammonia refrigerating apparatus
US2289441A (en) * 1940-03-14 1942-07-14 Ingersell Rand Company Rotary compressor
US3478957A (en) * 1968-03-26 1969-11-18 Borg Warner Oil separator for rotary compressor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4330596Y1 (fr) * 1964-09-05 1968-12-13
JPS505403A (fr) * 1973-05-18 1975-01-21

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US346038A (en) * 1886-07-20 Trap for ammonia refrigerating apparatus
US2289441A (en) * 1940-03-14 1942-07-14 Ingersell Rand Company Rotary compressor
US3478957A (en) * 1968-03-26 1969-11-18 Borg Warner Oil separator for rotary compressor

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295806A (en) * 1978-05-26 1981-10-20 Mitsubishi Denki Kabushiki Kaisha Rotary compressor with wire gauze lubricant separator
US4269576A (en) * 1978-07-29 1981-05-26 Diesel Kiki Co., Ltd. Vane compressor with reticulate or porous separator element and fluid guide means therein
US4279578A (en) * 1979-05-21 1981-07-21 Borg-Warner Corporation Compact oil separator for rotary compressor
US4470778A (en) * 1980-11-10 1984-09-11 Sanden Corporation Scroll type fluid displacement apparatus with oil separating mechanism
US5494412A (en) * 1993-04-26 1996-02-27 Goldstar Co., Ltd. Oil delivery prevention device for horizontal type rotary compressor
US5536153A (en) * 1994-06-28 1996-07-16 Edwards; Thomas C. Non-contact vane-type fluid displacement machine with lubricant separator and sump arrangement
US20040033151A1 (en) * 2001-11-20 2004-02-19 Jae-Sool Shim Compressor having oil returning apparatus
US20040115081A1 (en) * 2002-01-25 2004-06-17 Seiko Instruments Inc. Gas compressor
US7029243B2 (en) * 2002-01-25 2006-04-18 Calsonic Compressor Inc. Gas compressor having oil separation filter
US7484945B2 (en) * 2003-09-26 2009-02-03 Matsushita Electric Industrial Co., Ltd. Compressor for refrigerator-freezer having a porous member
US20060067846A1 (en) * 2003-09-26 2006-03-30 Atsuo Okaichi Compressor
US20050129536A1 (en) * 2003-12-10 2005-06-16 Shinichi Ohtake Compressor
US20050129556A1 (en) * 2003-12-10 2005-06-16 Kiyofumi Ito Compressor
US7736136B2 (en) 2003-12-10 2010-06-15 Sanden Corporation Compressor including separation tube engagement mechanism
US7438536B2 (en) 2003-12-10 2008-10-21 Sanden Corproation Compressors including a plurality of oil storage chambers which are in fluid communication with each other
US7413422B2 (en) 2004-04-13 2008-08-19 Sanden Corporation Compressor including pressure relief mechanism
US20050226756A1 (en) * 2004-04-13 2005-10-13 Sanden Corporation Compressor
US7314355B2 (en) 2004-05-27 2008-01-01 Sanden Corporation Compressor including deviated separation chamber
US7255543B2 (en) 2004-06-08 2007-08-14 Sanden Corporation Scroll compressor and air-conditioning system for vehicle using the scroll compressor
US20050271534A1 (en) * 2004-06-08 2005-12-08 Sanden Corporation Scroll compressor and air-conditioning system for vehicle using the scroll compressor
US7281912B2 (en) 2004-09-28 2007-10-16 Sanden Corporation Compressor having a safety device being built in at least one of the screw plugs of the oil-separator
US20060065012A1 (en) * 2004-09-28 2006-03-30 Sanden Corporation Compressor
US11054178B2 (en) 2017-11-15 2021-07-06 Vilter Manufacturing Llc Crankcase oil separation for high pressure reciprocating compressors
US11859603B2 (en) 2018-10-02 2024-01-02 Copeland Industrial Lp 3D-printed oil separation for reciprocating compressors

Also Published As

Publication number Publication date
GB1354582A (en) 1974-06-05
JPS5545755B1 (fr) 1980-11-19
DE2148741A1 (de) 1972-04-13
AU3389271A (en) 1973-03-29
CA937550A (en) 1973-11-27
FR2111273A5 (fr) 1972-06-02
AU459890B2 (en) 1975-04-10

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