Multi-stage centrifugal compressor driven by integral high speed motor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-017/00
F04B-035/00
출원번호
US-0128136
(2002-04-23)
발명자
/ 주소
Hill, M. Raymond
Grbic, Milovan R.
출원인 / 주소
Elliott Turbomachinery Co., Inc.
대리인 / 주소
Webb Ziesenheim Logsdon Orkin & Hanson, P.C.
인용정보
피인용 횟수 :
40인용 특허 :
7
초록▼
A multi-stage centrifugal compressor with an integral high-speed motor for compressing air has a variable speed permanent magnet motor having electronically commutated stator coils surrounding a rotor carrying permanent magnets, wherein there is a gap between the coils and the rotor. The rotor has a
A multi-stage centrifugal compressor with an integral high-speed motor for compressing air has a variable speed permanent magnet motor having electronically commutated stator coils surrounding a rotor carrying permanent magnets, wherein there is a gap between the coils and the rotor. The rotor has a magnetic steel rotor shaft rotatably supported at each end by pressurized oil lubricated hydrodynamic bearings. The stator coils have a plurality of stator wires extending longitudinally along the stator and continuing around the ends of the stator to define end turns. The compressor also has a plurality of compressor impellers mounted to turn with the rotor shaft and cooler for cooling the bearings, rotor and stator coils comprising a pump for introducing cooled oil into the bearings, said bearing configured so that oil exiting from the bearings splashes over the supported ends of the shaft and splashes over the end turns of the stator coils. There is a passageway through the stator for introducing pressurized air within a gap between the stator and the rotor during start up to maintain a positive pressure within the gap thereby displacing oil from the gap.
대표청구항▼
A multi-stage centrifugal compressor with an integral high-speed motor for compressing air has a variable speed permanent magnet motor having electronically commutated stator coils surrounding a rotor carrying permanent magnets, wherein there is a gap between the coils and the rotor. The rotor has a
A multi-stage centrifugal compressor with an integral high-speed motor for compressing air has a variable speed permanent magnet motor having electronically commutated stator coils surrounding a rotor carrying permanent magnets, wherein there is a gap between the coils and the rotor. The rotor has a magnetic steel rotor shaft rotatably supported at each end by pressurized oil lubricated hydrodynamic bearings. The stator coils have a plurality of stator wires extending longitudinally along the stator and continuing around the ends of the stator to define end turns. The compressor also has a plurality of compressor impellers mounted to turn with the rotor shaft and cooler for cooling the bearings, rotor and stator coils comprising a pump for introducing cooled oil into the bearings, said bearing configured so that oil exiting from the bearings splashes over the supported ends of the shaft and splashes over the end turns of the stator coils. There is a passageway through the stator for introducing pressurized air within a gap between the stator and the rotor during start up to maintain a positive pressure within the gap thereby displacing oil from the gap. completely through the rotor from the first end to the second end; a plurality of pistons, each said piston being reciprocatingly received in one of the cylinder bores; a swash plate member having a swash plate adjacent to the second end of the rotor; a spigot extending through the swash plate member and the central bore of the rotor, the rotor being rotatably supported on the spigot; an end cap releasibly connected to the first end of the rotor, the end cap closing off the cylinder bores at the first end of the rotor; a drive shaft rigidly connected to the end cap and extending away from the rotor; and a cover having an aperture rotatably receiving the drive shaft, the cover extending about the end cap and the rotor and being connected to the swash plate member. 8. The rotary pump as claimed in claim 7, including a lock valve connected to the swash plate member on a side thereof opposite the cover, the lock valve having a lock body, the spigot extending through the swash plate member and sealingly engaging the valve body. 9. The rotary pump as claimed in claim 8, wherein the spigot has two longitudinal passageways and openings extending outwardly adjacent to the rotor, the rotor having a passageway extending from each said cylinder bore thereof to the spigot, the passageways of the rotor being aligned with the openings in the spigot, whereby fluid passes between the longitudinal passageways in the spigot and the cylinder bores. 10. The rotary pump as claimed in claim 9, wherein the spigot, the rotor, the pistons and the valve body are of metal, whereby high-pressure fluid pumped by the pistons is confined in metal parts. 11. The rotary pump as claimed in claim 10, wherein the cover is of plastic. 12. The rotary pump as claimed in claim 9, wherein the valve has a bore extending therethrough, two valve passageways extending therethrough and communicating with the bore, each said valve passageway communicating with one of the passageways in the spigot, the valve body having an edge adjacent each said valve passageway along the bore, and a tank passageway, the tank passageway communicating with said each valve passageway when a land of the spool is shifted past the edge. 13. The rotary pump as claimed in claim 7, including a seal member extending about the drive shaft between the drive shaft and the cover. 14. The rotary pump as claimed in claim 13, wherein the seal member includes a resilient seal held by a rigid retainer, the cover having a recess which loosely receives the retainer, permitting limited movement of the seal member relative to the cover. 15. The rotary pump as claimed in claim 14, wherein the seal member has an inwardly facing channel which receives the seal. 16. The rotary pump as claimed in claim 15, including a resilient seal between the seal member and the cover. 17. A rotary pump, comprising: a rotor having a first end, a second end opposite the first end, a central bore and a plurality of cylinder bores arranged about the central bore and extending completely through the rotor from the first end to the second end; a plurality of pistons, each said piston being reciprocatingly received in one of the cylinder bores; a swash plate member having a swash plate adjacent to the second end of the rotor; a spigot extending through the swash plate member and the central bore of the rotor, the rotor being rotatably supported on the spigot; an end cap connected to the first end of the rotor by fasteners, the fasteners being bolts, the end cap closing off the cylinder bores at the first end of the rotor; a drive shaft rigidly connected to the end cap and extending away from the rotor; and a cover having an aperture rotatably receiving the drive shaft, the cover extending about the end cap and the rotor and being connected to the swash plate member. 18. A rotary pump, comprising: a rotor having a first end, a second end opposite the first end, a central bore and a plurality of cylinder bores arrange
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