Sliding vane positive displacement pump having a fixed disc configuration to reduce slip paths
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01C-021/08
F04C-027/00
F04C-002/00
F04C-002/344
F04C-015/00
출원번호
US-0870092
(2013-04-25)
등록번호
US-9476422
(2016-10-25)
발명자
/ 주소
Walters, Michael D
출원인 / 주소
Delaware Capital Formation, Inc.
대리인 / 주소
Miller Canfield Paddock and Stone
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
A sliding vane, positive displacement pump is provided which uses a fixed disc configuration wherein a rotor includes a pair of discs affixed to opposite faces of the rotor so as to rotate with the rotor/shaft. Preferably, the discs each have an outer diameter proximate the outer diameter of the rot
A sliding vane, positive displacement pump is provided which uses a fixed disc configuration wherein a rotor includes a pair of discs affixed to opposite faces of the rotor so as to rotate with the rotor/shaft. Preferably, the discs each have an outer diameter proximate the outer diameter of the rotor and define an outer disc surface which faces radially outwardly towards an opposing, inside surface of the pump head or other casing structure. A dynamic seal is provided along the outside disc diameter which eliminates the formation of slip between end surfaces. The path of fluid traveling from the high pressure pump side near the outlet to the low pressure side of pump near the inlet is controlled with a radial clearance that is defined between the OD of each disc and the ID of the stationary head. This effectively eliminates direct slip paths extending radially across axially-directed end faces.
대표청구항▼
1. A sliding-vane positive displacement pump, comprising: a housing assembly having a casing which defines a pumping chamber, and having an inlet and an outlet which respectively open into and out of said pumping chamber to permit pumping of a process fluid between said inlet and said outlet, said p
1. A sliding-vane positive displacement pump, comprising: a housing assembly having a casing which defines a pumping chamber, and having an inlet and an outlet which respectively open into and out of said pumping chamber to permit pumping of a process fluid between said inlet and said outlet, said pumping chamber having an annular chamber face which faces radially inwardly and has an eccentric profile when viewed axially, and having opposite open ends which open axially from opposite sides of said chamber, said housing assembly including first and second heads which mount to said casing over said open ends, each of said first and second heads having a circular inside head surface, wherein said inside head surfaces face radially inwardly and define head openings which open axially and define a respective inside head diameter;a rotatable shaft extending into said pumping chamber through at least one of said head openings; anda rotor/disc assembly which is mounted to said shaft and disposed within said pumping chamber to effect said pumping of a process fluid, said rotor/disc assembly comprising:a rotor mounted to said shaft which has a circumferential rotor surface facing radially outwardly toward the chamber face and has opposite rotor end faces which face axially toward said head openings, said rotor including a plurality of vane slots which are circumferentially spaced apart and open radially from said rotor surface and axially through said rotor end faces, said vane slots including radially slidable vanes which reversibly slide radially outwardly into continuous contact with said chamber face during shaft rotation and define pumping cavities circumferentially between said vanes; andopposite end discs which mount face wise over the entirety of said rotor end faces and close off opposite axial ends of said vane slots, said end discs being affixed to said rotor end faces to prevent leakage of process fluid and hydraulic slip face wise over an entirety of said rotor end faces during shaft rotation, each of said end discs having an outside disc face wherein said outside disc faces face radially outwardly in direct facing relation with said inside head surfaces so as to be closely adjacent said inside head surfaces and define a small radial clearance therebetween which forms a dynamic seal during rotation of said rotor and impedes leakage of process fluid axially through said radial clearance, said vanes projecting radially outwardly beyond said outside disc faces during shaft rotation, said rotor surface and said outside disc faces being respectively defined by a rotor outer diameter and disc outer diameters, said rotor outer diameter and said disc outer diameters being closely proximate to each other and less than but closely proximate to said inside head diameters wherein said vanes project radially outwardly beyond said rotor surface and said outside disc faces. 2. The pump according to claim 1, wherein said head assembly includes an annular liner which fits within said casing and defines said chamber face and said pumping chamber. 3. The pump according to claim 2, wherein said liner is captured axially between said first and second heads, said chamber face extending radially outwardly of said inside head surfaces. 4. The pump according to claim 3, wherein said chamber face defines said eccentric profile as viewed through said open ends. 5. The pump according to claim 1, wherein said shaft comprises shaft sections on opposite sides of said rotor, wherein each of said first and second heads includes a bearing unit supporting a respective one of said shaft sections. 6. The pump according to claim 1, wherein said rotor outer diameter and said disc outer diameters being proximate to but less than said head inside diameters so as to terminate said rotor and said end discs radially inwardly of said inside head surfaces with said first and second heads being free of slip-permitting surfaces facing axially toward said end discs and said rotor. 7. A sliding-vane positive displacement pump, comprising: a housing assembly having a casing which defines a pumping chamber, and having an inlet and an outlet which respectively open into and out of said pumping chamber to permit pumping of a process fluid between said inlet and said outlet, said pumping chamber having an annular chamber face which faces radially inwardly, and having opposite open ends which open axially from opposite sides of said chamber, said housing assembly including first and second heads which mount to said casing over said open ends, each of said first and second heads having an annular inside head surface, wherein said inside head surfaces face radially inwardly and define head openings which open axially and define respective head inside diameters;a rotatable shaft extending into said pumping chamber through said head openings; anda rotor/disc assembly which is mounted to said shaft and disposed within said pumping chamber to effect said pumping of a process fluid, said rotor/disc assembly comprising:a rotor mounted to said shaft which has a circumferential rotor surface facing radially outwardly toward the chamber face and has opposite rotor end faces which face axially toward said head openings, said rotor including a plurality of vane slots which are circumferentially spaced apart and open radially from said rotor surface and axially through said rotor end faces, said vane slots including radially slidable vanes which reversibly slide radially outwardly into continuous contact with said chamber face during shaft rotation and define pumping cavities circumferentially between said vanes; andopposite end discs which mount face wise over said rotor end faces and close off opposite axial ends of said vane slots, said end discs being affixed to said rotor end faces to prevent leakage of process fluid and hydraulic slip face wise over said rotor end faces during shaft rotation, each of said end discs having an outside disc face wherein said outside disc faces face radially outwardly in direct facing relation with said inside head surfaces and have disc outer diameters closely adjacent to but smaller than said head inside diameters to define a small radial clearance therebetween which forms a dynamic seal that impedes leakage of process fluid axially through said radial clearance, said vanes projecting radially beyond said outside disc faces in said continuous contact with said chamber face;said rotor surface and said outside disc faces being respectively defined by a rotor outer diameter and said disc outer diameters and said inside head surfaces being respectively defined by said head inside diameters, said rotor outer diameter and said disc outer diameters being closely proximate to but less than said head inside diameters such that said rotor does not extend radially beyond said head inside diameters and said disc outer diameters, and said first and second heads are free of slip-permitting surfaces facing axially toward said end discs and said rotor. 8. The pump according to claim 7, wherein said head assembly includes an annular liner which fits within said casing and defines said chamber face and said pumping chamber. 9. The pump according to claim 8, wherein said liner is captured axially between said first and second heads, said chamber face extending radially outwardly of said inside head diameters. 10. The pump according to claim 9, wherein said chamber face has an eccentric profile as viewed through said open ends. 11. The pump according to claim 7, wherein said shaft comprises shaft sections on opposite sides of said rotor, wherein each of said first and second heads includes a bearing unit supporting a respective one of said shaft sections. 12. A sliding-vane positive displacement pump, comprising: a housing assembly having a casing which defines a pumping chamber, and having an inlet and an outlet which respectively open into and out of said pumping chamber to permit pumping of a process fluid between said inlet and said outlet, said pumping chamber having an annular chamber face which faces radially inwardly, and opposite open ends which open axially from opposite sides of said chamber, said housing assembly including first and second heads which mount to said casing over said open ends, each of said first and second heads having an annular inside head surface, wherein said inside head surfaces face radially inwardly and define head openings which open axially through a respective axial thickness of said first and second heads;a rotatable shaft extending into said pumping chamber through at least one of said head openings; anda rotor/disc assembly which is mounted to said shaft and disposed within said pumping chamber to effect said pumping of a process fluid, said rotor/disc assembly comprising:a rotor mounted to said shaft which has a circumferential rotor surface facing radially outwardly toward the chamber face to define an outer rotor diameter and has opposite rotor end faces which face axially toward said head openings, said outer rotor diameter permitting said rotor to be slid axially through one of said head openings, said rotor including a plurality of vane slots which are circumferentially spaced apart and open radially from said rotor surface and axially through said rotor end faces, said vane slots including radially slidable vanes which reversibly slide radially outwardly into continuous contact with said chamber face during shaft rotation and define pumping cavities circumferentially between said vanes; andopposite end discs which mount face wise over said rotor end faces and close off opposite axial ends of said vane slots, said end discs being affixed to said rotor end faces to prevent leakage of process fluid and hydraulic slip face wise over an entirety of said rotor end faces during shaft rotation, each of said end discs having an outside disc face wherein said outside disc faces face radially outwardly in direct facing relation with said inside head surfaces, and said outside disc faces are disposed closely adjacent to but radially inwardly of said inside head surfaces to define a radial clearance along said axial head thickness which said radial clearance permits said end discs to fit axially into said head openings and impedes leakage of process fluid axially through said radial clearance and permits axial movement of said rotor/disc assembly relative to said first and second heads without interference with said first and second heads, said vanes projecting radially beyond said outside disc faces in said continuous contact with said chamber face. 13. The pump according to claim 12, wherein said head assembly includes an annular liner which fits within said casing and defines said chamber face and said pumping chamber, said liner being captured axially between said first and second heads, and said chamber face extending radially outwardly of said inside head surfaces. 14. The pump according to claim 13, wherein said vanes project radially outwardly beyond said rotor surface and in addition to said outside disc faces, and said vanes are slidable into and out of said vane slots during shaft rotation to maintain said continuous contact with said chamber face. 15. The pump according to claim 12, wherein said shaft comprises shaft sections on opposite sides of said rotor, wherein each of said first and second heads includes a bearing unit supporting a respective one of said shaft sections. 16. The pump according to claim 15, wherein said shaft sections are defined at opposite ends of said shaft wherein said shaft is insertable through a central shaft opening of said rotor so that said shaft section project from opposite sides of said rotor. 17. The pump according to claim 15, wherein said shaft sections are formed separate of each other and each have an inboard end affixed to a respective one of said end discs wherein said shaft sections are affixed to said rotor by fastening said end discs to said rotor. 18. The pump according to claim 17, wherein said end discs are joined together by fasteners which extend axially into respective fastener bores within said rotor. 19. A sliding-vane positive displacement pump, comprising: a housing assembly having a casing which defines a pumping chamber, and having an inlet and an outlet which respectively open into and out of said pumping chamber to permit pumping of a process fluid between said inlet and said outlet, said pumping chamber having an annular chamber face which faces radially inwardly, and opposite open ends which open axially from opposite sides of said chamber, said housing assembly including first and second heads which mount to said casing over said open ends, each of said first and second heads having an annular inside head surface, wherein said inside head surfaces face radially inwardly and define head openings which open axially;a rotatable shaft extending into said pumping chamber through said head openings, said shaft comprising shaft sections wherein each of said first and second heads includes a bearing unit supporting a respective one of said shaft sections;a rotor/disc assembly which is mounted to said shaft and disposed within said pumping chamber to effect said pumping of a process fluid, said rotor/disc assembly comprising:a rotor mounted to said shaft which has a circumferential rotor surface facing radially outwardly toward the chamber face and has opposite rotor end faces which face axially toward said head openings, said rotor including a plurality of vane slots which are circumferentially spaced apart and open radially from said rotor surface and axially through said rotor end faces, said vane slots including radially slidable vanes which reversibly slide radially outwardly into continuous contact with said chamber face during shaft rotation and define pumping cavities circumferentially between said vanes;opposite end discs which mount face wise over an entirety of said rotor end faces and close off opposite axial ends of said vane slots without extending radially beyond said rotor surface, each of said end discs having a respective one of said shaft sections affixed thereto wherein said shaft sections in turn are affixed to said rotor by fastening said end discs to said rotor with fasteners which extend axially into respective fastener bores within said rotor, said end discs being affixed to and covering said rotor end faces to prevent leakage of process fluid and hydraulic slip face wise over said rotor end faces during shaft rotation; andeach of said end discs having an outside disc face wherein said outside disc faces face radially outwardly in direct facing relation with and closely adjacent to said inside head surfaces to define a small radial clearance therebetween which impedes leakage of process fluid axially through said radial clearance, said rotor terminating radially so as to not extend beyond said head inside diameters with said entirety of said rotor end faces being covered by said end discs to prevent facewise slip over any portion of said rotor end faces. 20. The pump according to claim 19, wherein said rotor surface and said outside disc faces are respectively defined by a rotor outer diameter and disc outer diameters and said inside head surfaces are respectively defined by head inside diameters, said disc outer diameters being closely adjacent to but less than said head inside diameters by said radial clearance to permit axial movement of said rotor/disc assembly relative to said first and second heads without interference therebetween. 21. The pump according to claim 20, wherein said rotor outer diameter and said disc outer diameters are closely proximate to each other such that said vanes project radially outwardly beyond said rotor surface and said outside disc faces and only said vanes of said rotor/disc assembly extends beyond said head inside diameters, said vanes being slidable into and out of said vane slots during shaft rotation to maintain continuous contact with said chamber face.
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이 특허에 인용된 특허 (7)
Normandin Michel (1328 Nelles Ste-Foy ; Quebec CA), Compressor.
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