Patent US3941499A successfully refreshed from Google Patents.
US3941499A
Expired / Lapsed
US
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Compressor having two or more stages
Assignee: United Turbine AB and Co KG
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Filing: 1974-11-06
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Granted: 1976-03-02
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Expires: 1994-11-06
Abstract
Abstract In order to raise the degree of compression without unduly increasing the dimensions a compressor having at least two stages includes a first centripetal stage and a last centrifugal stage mounted upon the same shaft. The diameter at the centripetal stage inlet does not exceed the diameter at the outlet of the centrifugal stage and the air flows radially inwards in the first stage, and radially outwards in the last stage.
Inventors
- 👤 Sven-Olof Kronogard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:40
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/46; F04D29/462; F01; F01D; F01D25/00; F01D25/002; F04D17/00; F04D17/02; F04D17/08; F04D17/10; F04D17/12; F04D17/127; F04D29/4206; F04D29/4213; F05; F05D; F05D2250/00; F05D2250/50; F05D2250/51
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
In a two stage compressor, of which the first stage is a centripetal stage, and the second one is a centrifugal stage of the disc type, mounted upon a common shaft and together forming a flow path where the fluid to be compressed flows radially inwards the first stage and radially outwards in the second stage, the improvement being that the first centripetal stage is provided with adjustable inlet guide vanes as well as with outlet vanes immediately downstream of the rotor vanes, said inlet, rotor and outlet vanes, respectively, being individually formed with the same profile over the full length of the respective type of vane.
Claim 2
Dependent Claim
107 words
In a two stage compressor, of which the first stage is a centripetal stage, and the second one is a centrifugal stage of the disc type, mounted upon a common shaft and together forming a flow path where the fluid to be compressed flows radially inwards the first stage and radially outwards in the second stage, the improvement being that the first centripetal stage is provided with adjustable inlet guide vanes as well as with outlet vanes immediately downstream of the rotor vanes, said inlet, rotor and outlet vanes, respectively, being individually formed with the same profile over the full length of the respective type of vane.
Claim 3
Dependent Claim
41 words
The compressor according to claim 1 in which at least some of the adjustable guide vanes are provided with axial bores and slots communicating therewith, a peripheral passage supplying a liquid for washing the compressor being connected to the said bores.
Claim 4
Dependent Claim
44 words
The two stage compressor according to claim 1 in which the rotor vanes of the centripetal compressor extend cantilverwise in the axial direction with respect to the periphery of the rotor and are connected to the said rotor by means of a flexible membrane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |