Patent US1489719A successfully refreshed from Google Patents.
US4523896A
Expired / Lapsed
US
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Centrifugal compressor
Assignee: Creusot Loire SA
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Filing: 1983-05-16
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Granted: 1985-06-18
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Expires: 2003-05-16
Abstract
Abstract A centrifugal compressor capable of rotating at high speed by means of an electric motor comprises two compression stages cantilevered one at each end of a shaft, an electric motor of which the rotor is carried by a central part of the shaft, magnetic bearings, and a magnetic stop. The motor, the bearings and the stop are placed in a housing placed under a partial vacuum. Two facial gaskets adjustable as a result of longitudinal displacement of a component and of the shaft seal the compressor and ensure sealing of the space within the housing.
Inventors
- 👤 Bernard Lhenry
- 👤 Max Roustan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:06
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/05; F04D29/056; F04D29/058; F04D25/00; F04D25/02; F04D25/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
168 words
A centrifugal compressor capable of rotating at high speed, comprising (a) a single shaft carrying at least two compressor wheels cantilevered on its two ends for setting in motion fluid to be compressed; (b) a high-speed electric motor comprising a rotor carried by said shaft and located in a central portion of said shaft; (c) at least two magnetic bearings for supporting said shaft; (d) a magnetic stop for adjusting the axial position of said shaft; (e) a housing surrounding at least said electric motor, said magnetic bearings and said magnetic stop; (f) at least one first facial sealing means located at one of said compressor wheels and adjustable as a result of axial displacement of said shaft by means of said magnetic stop; (g) at least one second facial sealing means located at the second compressor wheel and adjustable as a result of a controlled longitudinal displacement of a supporting component; and (h) circuit means for placing the space within said housing under a predetermined partial vacuum.
Claim 2
Dependent Claim
168 words
A centrifugal compressor capable of rotating at high speed, comprising (a) a single shaft carrying at least two compressor wheels cantilevered on its two ends for setting in motion fluid to be compressed; (b) a high-speed electric motor comprising a rotor carried by said shaft and located in a central portion of said shaft; (c) at least two magnetic bearings for supporting said shaft; (d) a magnetic stop for adjusting the axial position of said shaft; (e) a housing surrounding at least said electric motor, said magnetic bearings and said magnetic stop; (f) at least one first facial sealing means located at one of said compressor wheels and adjustable as a result of axial displacement of said shaft by means of said magnetic stop; (g) at least one second facial sealing means located at the second compressor wheel and adjustable as a result of a controlled longitudinal displacement of a supporting component; and (h) circuit means for placing the space within said housing under a predetermined partial vacuum.
Claim 3
Dependent Claim
28 words
A centrifugal compressor as claimed in claim 1, wherein said circuit means comprises pipe means connecting said space within said housing to a suction pipe of said compressor.
Claim 4
Dependent Claim
24 words
A centrifugal compressor as claimed in claim 1, wherein said circuit means includes a device for generating a partial vacuum by means of suction.
Claim 5
Dependent Claim
37 words
A centrifugal compressor as claimed in claim 3, wherein said device for generating a partial vacuum by means of suction comprises at least one injector and means connecting said injector to a delivery pipe of said compressor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |