US3900277A - Rotary compressor - Google Patents

Rotary compressor Download PDF

Info

Publication number
US3900277A
US3900277A US43951274A US3900277A US 3900277 A US3900277 A US 3900277A US 43951274 A US43951274 A US 43951274A US 3900277 A US3900277 A US 3900277A
Authority
US
United States
Prior art keywords
rotor
gas
housing
cylindrical
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
Inventor
Alwin B Newton
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US26184672A priority Critical
Application filed by Borg Warner Corp filed Critical Borg Warner Corp
Priority to US43951274 priority patent/US3900277A/en
Application granted granted Critical
Publication of US3900277A publication Critical patent/US3900277A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Abstract

A rotary gas compressor of the sliding vane type having a rotor positioned eccentrically within a working chamber provided by a cylinder in the stator housing which is closed by end plates secured to the housing. The rotor carries blades or vanes slidable within slots formed in the rotor to engage the cylinder and sweep the working chamber to compress gas introduced therein. The end plates are formed with arcuate, gas discharge slots connecting the outlet port of the housing with circumferentiallyspaced discharge slots in the rotor in a manner to provide an alternate, low resistance path for gas flow at a point located a substantial distance from the outlet port. This arrangement is effective to reduce the extremely high pressure which is normally generated in the discharge zone as the vanes approach the main outlet port and valve assembly.

Description

United States Patent [191 Newton [451 Aug. 19, 1975 [73] Assignee: Borg-Warner Corporation, Chicago,
Filed: Feb. 4, 1974 Appl. No.: 439,512
Related U.S. Application Data [63] Continuation-in-part of Ser. No. 261,846, June 12,
1972 abandoned.
Primary E.\'aminerC. J. Husar Assistant ExaminerLeonard Smith Attorney, Agent, or F irm-Thomas B. Hunter 1 5 7 ABSTRACT A rotary gas compressor of the sliding vane type having a rotor positioned eccentrically within a working chamber provided by a cylinder in the stator housing which is closed by end plates secured to the housing. The rotor carries blades or vanes slidable within slots formed in the rotor to engage the cylinder and sweep the working chamber to compress gas introduced therein. The end plates are formed with arcuate, gas discharge slots connecting the outlet port of the housing with circumferentially-spaced discharge slots in the rotor in a manner to provide an alternate, low resistance path for gas flow at a point located a substantial distance from the outlet port. This arrangement is effective to reduce the extremely high pressure which is normally generated in the discharge zone as the vanes approach the main outlet port and valve assembly.
1 Claim, 4 Drawing Figures PATENTEU AUG 1 9197s M s I m. M. g
ROTARY COMPRESSOR CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation-in-part of my copcnding application Ser. No. 261,846, filed June 12, 1972, now abandoned.
BACKGROUND AND SUMMARY OF THE INVENTION This invention relates to gas compressors and more particularly to gas discharge arrangements for compressors.
One common type of rotary gas compressor comprises a bladed or vaned rotor eccentrically mounted in a cylindrical stator housing to provide a crescentshaped working chamber between the rotor and housing. The chamber communicates with an inlet or suction port and an outlet or discharge port. During rotation of the rotor, gas flows through the suction port and into the chamber and is then compressed by the vanes between the converging walls of the rotor and the cylinder. As the blades approach the discharge port, the distance between the cylinder wall and the rotor surface is very small; and, as a result, gas is under extremely high pressure in the zone adjacent to the discharge port. When the compressor is operating with high discharge pressure, this restriction adjacent the discharge port becomes even more troublesome, resulting in extreme overcompression of the gas and concommitant loss of efficiency.
There are numerous examples in the prior art of discharge arrangements which provide a continuous flow path for discharge gas after suction is closed. In US. Pat. No. 1,949,723 (Kotelevtseff) issued Mar. 6, 1934, a rotor sweeps the compression chamber in such a way that discharge gas is continuously directed through a passage in one end wall during the final 90 of rotation. Such a device is mechanically fixed as to discharge and provides only a single path for discharge gas flow.
In US. Pat. No. 2,674,953 (Conde), issued Apr. 13, 1954, the compression chamber is defined in part by an end wall having an elongated, arcuate discharge port formed therein. This has the disadvantage that the gas, which is in the final stage of compression before the vane passes into the area of the port, will blow-back (short circuit) into the pocket defined between the leading and trailing vanes. This could cause a serious loss in capacity, because it would perform a considerable part of its work forcing the gas from a leading pocket to a trailing pocket.
The rotary gas compressor of the present invention is characterized by the provision of an improved gas discharge arrangement featuring a housing having a discharge port, which is covered by a discharge valve, and arcuate slots in its end faces communicating with said outlet port and cooperating with fluid passages in the rotor adjacent each vane to provide a secondary, low pressure drop path for gas flow at a point located at a substantial distance from the outlet port in the housing. In this arrangement, the gas may begin to flow to the outlet port as soon as the rotor ports are in communication with the distal ends of the slots in the housing, provided there is sufficient pressure to overcome the opening force on the discharge valve. This alternate. low resistance path is effective in reducing the extremely high pressures otherwise normally generated in the discharge zone of a conventional gas compressor as the vanes approach the discharge port.
Another aspect of the invention relates to the location of the arcuate slots in the end faces. Except for the outlet end of the slots, they are completely covered by the side faces of the rotor. This prevents gas from blowing back through the slot to the trailing, lower pressure pocket. Thus the only blow-back that can occur is over the tip of the vane in the outlet zone (inherent in all sliding vane compressors) and some small carryover of high pressure gas from the pockets in the rotor side faces.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a rotary gas compressor having an improved gas discharge arrangement;
FIG. 2 is a cross-sectional view taken along the plane of line 2-2 of FIG. 1;
FIG. 3 is a cross-sectional view taken along the plane of line 33 of FIG. 1; and
FIG. 4 is a cross-sectional view taken along the plane of line 44 of FIG. I, but with the valve stop removed.
BRIEF DESCRIPTION OF THE INVENTION Referring to FIGS. 1 and 2, the gas compressor comprises a rotor assembly 11 rotatable within a stator assembly 12 and which serves as a housing for the rotor assembly. More particularly, the stator assembly 12 comprises a cylinder housing '13 and end plates 14 and held in engagement with housing 13 by bolts 16. The plates 14 and 15 are bored as at 17 and 18 to provide bearings for rotatably mounting the rotor assembly 11 within the stator assembly 12.
The rotor assembly 11 comprises a cylindrical rotor 19 having a plurality of equidistantly-spaced slots 20 receiving vanes 21 slidably reciprocable therein. Rotor 19 is keyed at 22 to a drive shaft 23 journalled in the bearings 17 and 18 and is adapted to be driven by a pulley 24 connected to a motor (not shown) or other suitable drive means. In the case of an automotive application, the compressor is usually driven from the engine through an accessory drive system.
As shown in FIG. 1, the substantially cylindrical inner surface 25 of the cylinder housing 13 has a contact area 26 engaging the outer cylindrical surface 19b of the rotor. Since the rotor is rotatably mounted on an axis 27 offset from the center line of the cylinder wall, the rotor is substantially in sliding contact with the contact area 26, leaving a generally crescent-shaped working chamber 28 extending over a substantial portion of the inner periphery of the cylinder housing '13.
As best shown in FIGS. 1 and 4, a suction port 29 and a discharge passage 30 are provided in the cylinder housing 13, both of which communicate with the working chamber 28. A discharge gas plenum is located between discharge passage 30 and a series of ports 41 which communicate directly with the discharge gas zone 42 adjacent the contact area 26. Ports 4] are drilled through a valve plate 43 to which is secured a valve 44 and valve stop 45 in a conventional manner. For clarity, the valve stop is not shown in FIG. 4. Valve 44 is biased to a closed position and requires a predetermined opening force to build up in the discharge zone 42 before gas may flow into plenum 40 and discharge passage 30.
The improved gas discharge system comprises a plurality of substantially arcuate gas discharge slots 31 and 32 in the end faces of the housing plates 14 and 15, respectively, the slots communicating with discharge passage 30 in the cylinder housing through the valve 44. The end faces 19a and 19b of rotor 19 are provided with circumferentially-spaced fluid passages 33, 34 lo cated on opposite faces 19a and 19b of the rotor immediately ahead of each vane 21, in terms of the direction of rotation shown by the arrow, FIG. 1. The passages 33 and 34 cooperate with the slots 31 and 32 in a manner that the respective sets of the passages 33 and 34 are successively placed in communication with the slots 31 and 32 in the end plates 14 and 15 during rotation of the rotor in the direction indicated by the arrow in FIG. 1.
In the operation of the compressor, the discharge slots 31 and 32 in the housing plates 14 and 15 are effective to provide an alternate, low resistance path for gas flow at a point located a substantial distance from the outlet port of the stator housing. As shown in FIG. 1, the passage 33, which would be located directly across from passage 34, as illustrated, is just beginning communication with the entrance end 3112 of slot 31. It will be noted that the passage is defined by the slot 31 and the side face 19a of rotor 19 as the vane sweeps along. Accordingly, the gas may not flow back to the trailing pocket, as would be case if the slot 31 were located radially outwardly of the peripheral surface 191; of rotor 19.
At the same time, gas may also be discharged through the primary passage defined between the cylindrical surface 19b of rotor 19, end plates 14 and 15, and surface 25 of the cylinder, as in a conventional rotary sliding vane compressor. It will be apparent from the foregoing description that there is provided an improved arrangement for discharging high pressure gas from a compressor which effectively reduces the extremely high pressures normally generated in the outlet area as the vanes approach the same. The system also provides minimum flow resistance by avoidance of flow restriction to thereby insure proper compression at the outlet of the compressor.
What is claimed is:
1. A rotary gas compressor comprising a housing having a substantially cylindrical interior surface and opposed end plates defining a closed chamber;
a rotor having a cylindrical peripheral surface and opposed side faces, said rotor being mounted in said chamber and rotatable about an axis which is offset with respect to the axis of said cylindrical interior surface, said rotor and said housing defining a generally crescent shaped compression cavity;
a gas inlet port and a gas discharge port communicating with said compression cavity;
a valve associated with said gas discharge port;
a plurality of vanes slidably supported in said rotor and engaging said cylindrical interior surface;
means defining an elongated slot in at least one of said end plates having an exit end located in communication with said discharge port and an entrance end located at a point circumferentially spaced in a direction toward said inlet port and inwardly spaced from said cylindrical peripheral surface, the entire slot being substantially covered by one of the side faces of said rotor; and
means defining a passage immediately adjacent each vane in said one rotor end surface extending away from the cylindrical surface and providing a first flow path for gas which intermittently connects that portion of the compression cavity ahead of the vane with the entrance end of said elongated slot, a second flow path, communicating with said discharge port, for gas being provided between the cylindrical surface on said rotor, the cylindrical inte rior surface of said housing and said end plates within said housing.

Claims (1)

1. A rotary gas compressor comprising a housing having a substantially cylindrical interior surface and opposed end plates defining a closed chamber; a rotor having a cylindrical peripheral surface and opposed side faces, said rotor being mounted in said chamber and rotatable about an axis which is offset with respect to the axis of said cylindrical interior surface, said rotor and said housing defining a generally crescent shaped compression cavity; a gas inlet port and a gas discharge port communicating with said compression cavity; a valve associated with said gas discharge port; a plurality of vanes slidably supported in said rotor and engaging said cylindrical interior surface; means defining an elongated slot in at least one of said end plates having an exit end located in communication with said discharge port and an entrance end located at a point circumferentially spaced in a direction toward said inlet port and inwardly spaced from said cylindrical peripheral surface, the entire slot being substantially covered by one of the side faces of said rotor; and means defining a passage immediately adjacent each vane in said one rotor end surface extending away from the cylindrical surface and providing a first flow path for gas which intermittently connects that portion of the compression cavity ahead of the vane with the entrance end of said elongated slot, a second flow path, communicating with said discharge port, for gas being provided between the cylindrical surface on said rotor, the cylindrical interior surface of said housing and said end plates within said housing.
US43951274 1972-06-12 1974-02-04 Rotary compressor Expired - Lifetime US3900277A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US26184672A true 1972-06-12 1972-06-12
US43951274 US3900277A (en) 1972-06-12 1974-02-04 Rotary compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US43951274 US3900277A (en) 1972-06-12 1974-02-04 Rotary compressor

Publications (1)

Publication Number Publication Date
US3900277A true US3900277A (en) 1975-08-19

Family

ID=26948877

Family Applications (1)

Application Number Title Priority Date Filing Date
US43951274 Expired - Lifetime US3900277A (en) 1972-06-12 1974-02-04 Rotary compressor

Country Status (1)

Country Link
US (1) US3900277A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021166A (en) * 1975-12-01 1977-05-03 Stal-Refrigeration Ab Rotary vane compressor with increased outlet through-flow area
DE3013006A1 (en) * 1979-04-04 1980-10-23 Matsushita Electric Ind Co Ltd TURNING PISTON COMPRESSORS
US4239467A (en) * 1977-10-13 1980-12-16 Stal Refrigeration Ab Rotary compressor with valved liquid injection through the rotor
US4516918A (en) * 1982-05-25 1985-05-14 Trw Inc. Pump assembly
US4960371A (en) * 1989-01-30 1990-10-02 Bassett H Eugene Rotary compressor for heavy duty gas services
DE4116747A1 (en) * 1990-05-24 1991-11-28 Zexel Corp Vane cell compressor - has two outlet channels in one of two side parts and several grooves in rotor outer peripheral surface to support outflow
DE19907428C2 (en) * 1998-02-24 2002-05-08 Zexel Valeo Climate Contr Corp Vane compressor
US6422845B1 (en) * 2000-12-01 2002-07-23 Delphi Technologies, Inc. Rotary hydraulic vane pump with improved undervane porting
US6589033B1 (en) 2000-09-29 2003-07-08 Phoenix Analysis And Design Technologies, Inc. Unitary sliding vane compressor-expander and electrical generation system
US20100329917A1 (en) * 2009-06-30 2010-12-30 Jtekt Corporation Vane pump
US20160152460A9 (en) * 2013-03-14 2016-06-02 The Coca-Cola Company Rotary Cabonator
US20170342982A1 (en) * 2015-01-28 2017-11-30 Gree Green Refrigeration Technology Center Co., Ltd. Of Zhuhai Sliding Vane Type Compressor and Exhaust Structure Thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949723A (en) * 1933-03-07 1934-03-06 Serge G Kotelevtseff Air compressor and supercharger
US2674953A (en) * 1950-03-18 1954-04-13 Lyall T Conde Rotary pump
US3649140A (en) * 1970-05-11 1972-03-14 Borg Warner Oil metering system for rotary compressor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949723A (en) * 1933-03-07 1934-03-06 Serge G Kotelevtseff Air compressor and supercharger
US2674953A (en) * 1950-03-18 1954-04-13 Lyall T Conde Rotary pump
US3649140A (en) * 1970-05-11 1972-03-14 Borg Warner Oil metering system for rotary compressor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021166A (en) * 1975-12-01 1977-05-03 Stal-Refrigeration Ab Rotary vane compressor with increased outlet through-flow area
US4239467A (en) * 1977-10-13 1980-12-16 Stal Refrigeration Ab Rotary compressor with valved liquid injection through the rotor
DE3013006A1 (en) * 1979-04-04 1980-10-23 Matsushita Electric Ind Co Ltd TURNING PISTON COMPRESSORS
US4516918A (en) * 1982-05-25 1985-05-14 Trw Inc. Pump assembly
US4960371A (en) * 1989-01-30 1990-10-02 Bassett H Eugene Rotary compressor for heavy duty gas services
DE4116747C2 (en) * 1990-05-24 1996-05-23 Zexel Corp Vane compressor with improved exhaust valve arrangement
DE4116747A1 (en) * 1990-05-24 1991-11-28 Zexel Corp Vane cell compressor - has two outlet channels in one of two side parts and several grooves in rotor outer peripheral surface to support outflow
DE19907428C2 (en) * 1998-02-24 2002-05-08 Zexel Valeo Climate Contr Corp Vane compressor
US6589033B1 (en) 2000-09-29 2003-07-08 Phoenix Analysis And Design Technologies, Inc. Unitary sliding vane compressor-expander and electrical generation system
US6422845B1 (en) * 2000-12-01 2002-07-23 Delphi Technologies, Inc. Rotary hydraulic vane pump with improved undervane porting
US20100329917A1 (en) * 2009-06-30 2010-12-30 Jtekt Corporation Vane pump
US10041491B2 (en) * 2009-06-30 2018-08-07 Jtekt Corporation Vane pump containing a back pressure introduction passage
US20160152460A9 (en) * 2013-03-14 2016-06-02 The Coca-Cola Company Rotary Cabonator
US9440836B2 (en) * 2013-03-14 2016-09-13 The Coca-Cola Company Rotary cabonator
US20170342982A1 (en) * 2015-01-28 2017-11-30 Gree Green Refrigeration Technology Center Co., Ltd. Of Zhuhai Sliding Vane Type Compressor and Exhaust Structure Thereof
US10451070B2 (en) * 2015-01-28 2019-10-22 Gree Green Refrigeration Technology Center Co., Ltd. Of Zhuhai Sliding vane compressor and exhaust structure thereof

Similar Documents

Publication Publication Date Title
US3900277A (en) Rotary compressor
US4035115A (en) Vane pump
US3799707A (en) Rotary compressor
ES295152A1 (en) Compressor lubrication means
US3469500A (en) Vane-type fluid motor
US4118157A (en) Rotary compressor
US3649140A (en) Oil metering system for rotary compressor
US4571164A (en) Vane compressor with vane back pressure adjustment
US2448901A (en) Interengaging impeller rotary positive displacement blower
US3877853A (en) Vane controlling system for rotary sliding vane compressor
US3743443A (en) Vacuum pump
US4514157A (en) Rotary vane compressor
KR100263408B1 (en) Rotary compressor with discharge chamber pressure relief groove
KR930009734B1 (en) Rotary compressor
US4531899A (en) Positive displacement rotary gas compressor pump
US4498853A (en) Vane-type compressor
US4826407A (en) Rotary vane pump with ballast port
US4502854A (en) Vane compressor having rearwardly located suction connector and discharge connector
US3191853A (en) Rotary compressor
US4068981A (en) Blade-type rotary compressor with full unloading and oil sealed interfaces
US4810177A (en) Vane compressor with vane back pressure adjustment
US3671154A (en) Epitrochoidal compressor
US5464329A (en) Water ring type pump with sidewall water reflux passage
JP2757922B2 (en) Centrifugal compressor
US4021166A (en) Rotary vane compressor with increased outlet through-flow area