Roots type gear compressor with helical lobes having feedback cavity
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03C-002/00
F03C-004/00
F04C-002/00
출원번호
US-0289459
(2008-10-28)
등록번호
US-8096797
(2012-01-17)
발명자
/ 주소
Kaplan, Jirka
Davenport, Les
출원인 / 주소
592301 Alberta Ltd.
대리인 / 주소
Gowling Lafleur Henderson LLP
인용정보
피인용 횟수 :
3인용 특허 :
6
초록▼
A gear compressor or supercharger for compressing compressible fluids such as air, having a pair of intermeshing helical lobed rotors. A plenum or cavity is provided at a rear end of the gear compressor, situated rearwardly of said rotors and below an respective axis of rotation of each of said roto
A gear compressor or supercharger for compressing compressible fluids such as air, having a pair of intermeshing helical lobed rotors. A plenum or cavity is provided at a rear end of the gear compressor, situated rearwardly of said rotors and below an respective axis of rotation of each of said rotors, which spans at least a distance between said respective longitudinal axis of rotation of each of said rotors. In a preferred embodiment the plenum is in direct fluid communication with high pressure fluid which is discharged from said high pressure discharge port. The above modification improves the efficiency of the compressor, particularly at high revolutions.
대표청구항▼
1. A gear compressor for compressing compressible fluids such as air, comprising: a housing defining first and second mutually adjacent, parallel, elongate overlapping cylindrical chambers, having a front end and a rear end and a low pressure inlet port and a high pressure discharge port thereon;a p
1. A gear compressor for compressing compressible fluids such as air, comprising: a housing defining first and second mutually adjacent, parallel, elongate overlapping cylindrical chambers, having a front end and a rear end and a low pressure inlet port and a high pressure discharge port thereon;a pair of juxtaposed rotors, each disposed in a respective cylindrical chamber and oppositely rotatable, each having a plurality of radially outwardly extending lobes thereon equidistantly circumferentially spaced about a periphery of each rotor and intermeshed along a side thereof with lobes of an opposite rotor of said pair of rotors, each of said lobes on said rotors twisted about a respective longitudinal axis of rotation of each rotor in a helix angle, each helix angle of each of said lobes on a first of said pair of rotors being equal and opposite to said helix angle of each of said lobes on said other of said pair of rotors, said rotors within said respective cylindrical chambers each adapted to transfer volumes of compressible low pressure fluid from said low pressure inlet port via spaces created between walls of said respective cylinder chambers and unmeshed lobes of each rotor axially along said respective cylindrical chambers from said front end to said rear end of said gear compressor and then axially back along said gear compressor to a location proximate said front end of said gear compressor and thereafter to said high pressure discharge port;said high pressure discharge port situated on a bottom of said gear compressor proximate said front end thereof;said low pressure inlet port situated on a top surface of said gear compressor proximate said front end thereof;a front end wall situated at said front end of said gear compressor;a rear end wall situated at said rear end of said gear compressor; anda plenum at said rear end of said gear compressor situated rearwardly of said rotors and below said respective axis of rotation of each of said rotors, which spans at least a distance between said respective longitudinal axis of rotation of each of said rotors. 2. The gear compressor as claimed in claim 1, wherein said plenum is in fluid communication with high pressure fluid which is discharged from said high pressure discharge port. 3. The gear compressor as claimed in claim 2 wherein piping fluidly connects said plenum with said high pressure discharge port. 4. The gear compressor as claimed in claim 2, said rear end wall having pipe coupling means thereon in communication with said plenum, said pipe coupling means adapted to permit fluid communication via piping connected thereto to high pressure fluid exiting from said high pressure discharge port. 5. The gear compressor as claimed in claim 1, said plenum at said rear end of said gear compressor of a height so as to span substantially a radial height of each individual lobe of each rotor. 6. The gear compressor as claimed in claim 1 further comprising an aperture area on a lower point of intersection of said mutually adjacent chambers, proximate said rear end of said gear compressor, which aperture is in fluid communication with said plenum. 7. The gear compressor as claimed in claim 6, wherein said aperture area is a ‘v’-shaped area, having its largest area proximate said rear end of said gear compressor. 8. The gear compressor as claimed in claim 1, wherein each of said rotors has three lobes, and said helix angle is between 55° and 130°. 9. A gear compressor for compressing compressible fluids such as air, comprising: a housing defining first and second mutually adjacent, parallel, elongate overlapping cylindrical chambers, having a front end and a rear end and a low pressure inlet port and a high pressure discharge port thereon;a pair of juxtaposed substantially identically configured rotors, each disposed in a respective cylindrical chamber and oppositely rotatable, each having a plurality of radially outwardly extending lobes thereon equidistantly circumferentially spaced about a periphery of each rotor and intermeshed along a side thereof with lobes of an opposite rotor of said pair of rotors, each of said lobes on said rotors twisted about a respective longitudinal axis of rotation of each rotor in a helix angle, each helix angle of each of said lobes on a first of said pair of rotors being equal and opposite to said helix angle of each of said lobes on said other of said pair of rotors, said rotors within said respective cylindrical chambers each adapted to transfer volumes of compressible low pressure fluid from said low pressure inlet port via spaces created between walls of said respective cylinder chambers to said high pressure outlet port;said high pressure discharge port situated on a bottom of said gear compressor proximate said front end thereof;said low pressure inlet port situated on a top surface of said gear compressor proximate said front end thereof;a front wall situated at said front end of said gear compressor;a rear wall situated at said rear end of said gear compressor; anda cavity in said rear wall situated below said respective axis of rotation of each of said rotors spanning at least a distance between said longitudinal axis of rotation of said rotors, to permit transfer volumes of fluid given rearward momentum via said helical lobes and to re-inject said transferred volumes intermediate said lobes when said lobes rotate to a position to allow delivery of said transferred volumes axially back to said high pressure discharge port. 10. The gear compressor as claimed in claim 9, wherein said cavity is in fluid communication with compressed fluid from said high pressure discharge port on said gear compressor. 11. The gear compressor as claimed in claim 10 further comprising an aperture area on a lower point of intersection of said mutually adjacent chambers, proximate said rear end of said gear compressor, which aperture is in fluid communication with said cavity. 12. The gear compressor as claimed in claim 11, wherein said aperture area is a ‘v’-shaped area, having its largest area proximate said rear wall of said gear compressor. 13. The gear compressor as claimed in claim 10 wherein piping fluidly connects said rear cavity means with said high pressure discharge port. 14. The gear compressor as claimed in claim 13, said rear end wall having pipe coupling means thereon to permit fluid communication via piping to high pressure fluid exiting from said high pressure discharge port. 15. The gear compressor as claimed in claim 9, said cavity at said rear end of said gear compressor of a height so as to span substantially a radial height of each individual lobe of each rotor. 16. The gear compressor as claimed in claim 9, wherein each of said rotors has three lobes, and said helix angle is between 55° and 130°. 17. A supercharger for an internal combustion engine, comprising: a housing defining first and second mutually adjacent, parallel, elongate overlapping cylindrical chambers, having a front end and a rear end and a low pressure inlet port and a high pressure discharge port thereon;a pair of juxtaposed rotors, each disposed in a respective cylindrical chamber and oppositely rotatable, each having a plurality of radially outwardly extending lobes thereon equidistantly circumferentially spaced about a periphery of each rotor and intermeshed along a side thereof with lobes of an opposite rotor of said pair of rotors, each of said lobes on said rotors twisted about a respective longitudinal axis of rotation of each rotor in a helix angle, each helix angle of each of said lobes on a first of said pair of rotors being equal and opposite to said helix angle of each of said lobes on said other of said pair of rotors, said rotors within said respective cylindrical chambers each adapted to transfer volumes of compressible low pressure fluid from said low pressure inlet port via spaces created between walls of said respective cylinder chambers and unmeshed lobes of each rotor axially along said respective cylindrical chambers from said front end to said rear end of said supercharger and then axially back along said supercharger to a location proximate said front end of said supercharger and thereafter to said high pressure discharge port;said high pressure discharge port situated on a bottom of said supercharger proximate said front end thereof;said low pressure inlet port situated on a top surface of said supercharger proximate said front end thereof;a front end wall situated at said front end of said supercharger;a rear wall situated at said rear end of said supercharger; anda plenum at said rear end of said supercharger situated rearwardly of said rotors, said rear end wall having an aperture therein situated below said respective axis of rotation of each of said rotors adjacent a rear face of each of said rotors, wherein said aperture spans a distance between said respective longitudinal axis of rotation of each of said rotors and is in fluid communication with said plenum. 18. The supercharger as claimed in claim 17, wherein said aperture span is approximately equal to said distance between said respective longitudinal axis of rotation of each of said rotors. 19. The supercharger as claimed in claim 17 wherein said plenum is further adapted to be in fluid connection with compressed fluid from said high pressure discharge port on said supercharger. 20. The supercharger as claimed in claim 19, said rear end wall having pipe coupling means thereon in fluid communication with said plenum to permit fluid communication with high pressure fluid exiting from said high pressure discharge port. 21. The supercharger as claimed in claim 20 further comprising an aperture area on a lower point of intersection of said mutually adjacent chambers, proximate said rear end of said supercharger, which aperture is in fluid communication with said plenum.
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