US3795458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multistage compressor
Assignee: Brown Boveri Sulzer Turbomaschinen AG
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Filing: 1972-01-17
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Granted: 1974-03-05
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Expires: 1992-01-17
Abstract
Abstract The axial-flow low pressure section and radial-flow or diagonalflow high pressure section are separated by a recooler in which the working fluid is first deflected outwardly from the rotor, spread fanwise in a channel around and perpendicularly of the rotor, then deflected towards the rotor and fed perpendicularly through a channel to the compressor axis. In addition, a cooling element is disposed in one of the channels for cooling of the working fluid.
Inventors
- 👤 R Strub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:02
CPC Classifications
F; F04; F04D; F04D17/00; F04D17/02; F04D17/025; F04D29/00; F04D29/58; F04D29/582; F04D29/5826
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A multistage compressor comprising a casing; a rotor within said casing; an axial-flow low-pressure section having a plurality of stages about said rotor for compressing a working fluid without cooling to a maximum permissible temperature; a radial-flow high-pressure section downstream of said lowpressure section on said rotor; means within said casing between said low-pressure section and said high pressure section including a first deflector section for deflecting the working fluid perpendicularly outwardly away from said rotor, a first channel for thereafter spreading out the working fluid flow fanwise around and perpendicularly to said rotor, a second deflector section for deflecting the fluid perpendicular to said rotor towards said rotor and thereafter into said high-pressure section; and at least one cooling element in said means for cooling the working fluid passing through said means to reduce the heat of compression acquired by the flow in said axial-flow section and to achieve a very high compression ratio prior to flow of the fluid into said radial-flow section.
Claim 2
Dependent Claim
165 words
A multistage compressor comprising a casing; a rotor within said casing; an axial-flow low-pressure section having a plurality of stages about said rotor for compressing a working fluid without cooling to a maximum permissible temperature; a radial-flow high-pressure section downstream of said lowpressure section on said rotor; means within said casing between said low-pressure section and said high pressure section including a first deflector section for deflecting the working fluid perpendicularly outwardly away from said rotor, a first channel for thereafter spreading out the working fluid flow fanwise around and perpendicularly to said rotor, a second deflector section for deflecting the fluid perpendicular to said rotor towards said rotor and thereafter into said high-pressure section; and at least one cooling element in said means for cooling the working fluid passing through said means to reduce the heat of compression acquired by the flow in said axial-flow section and to achieve a very high compression ratio prior to flow of the fluid into said radial-flow section.
Claim 3
Dependent Claim
20 words
A multistage compressor as set forth in claim 1 wherein said cooling element is disposed in one of said channels.
Claim 4
Dependent Claim
23 words
A multistage compressor as set forth in claim 1 Wherein said stages includes axial flow blades for compressing the working fluid without recooling.
Claim 5
Dependent Claim
24 words
A multistage compressor as set forth in claim 3 wherein said blades of at least the first stages are adjustable about a radial axis.
Claim 6
Dependent Claim
22 words
A multistage compressor as set forth in claim 5 wherein at least one stage downstream of said adjustable blades includes non-adjustable blades.
Claim 7
Dependent Claim
36 words
A multistage compressor as set forth in claim 1 wherein said high-pressure section includes at least two radial-flow rotors and a second cooling element between said radial flow rotors for cooling the working fluid passing therebetween.
Claim 8
Dependent Claim
39 words
A multistage compressor as set forth in claim 1 which further includes an adjustable exit guide blade downstream of said stages of said low-pressure section and a non-adjustable entry guide blade between said exit guide blade and said means.
References Cited (Backward Citations)
CH215474A
Cited
US2540991A
Cited
US2396484A
Cited
US2619279A
Cited
US2925954A
Cited
US3303989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |