Patent US4642023A successfully refreshed from Google Patents.
US4642023A
Expired / Lapsed
US
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Vented shrouded inducer
Assignee: Boeing North American Inc
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Filing: 1985-07-29
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Granted: 1987-02-10
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Expires: 2005-07-29
Abstract
Abstract A pump having a shrouded inducer rotatably mounted within a housing. An outer periphery of the shroud and an adjacent inner surface of the housing defines an annular space through which a recirculation flow of fluid occurs during operation of the pump. The shroud is provided with a plurality of vent holes located about an outer periphery of the shroud and extending therethrough to alleviate damage which would otherwise result from such recirculation flow.
Inventors
- 👤 Charlton Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:37
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/669; F04D29/18; F04D29/22; F04D29/2261; F04D29/2277
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
In a pump having a shrouded inducer rotatably mounted within a housing wherein an outer periphery of the shroud and an adjacent inner surface of the housing defines an annular space which conveys a recirculation flow of fluid during operation of the pump, an improvement for alleviating damage associated with said recirculation flow, the improvement comprising; a plurality of vent holes located about the outer periphery of the inducer shroud and extending therethrough for conveying said recirculation flow from said annular space back into said shrouded inducer.
Claim 2
Dependent Claim
87 words
In a pump having a shrouded inducer rotatably mounted within a housing wherein an outer periphery of the shroud and an adjacent inner surface of the housing defines an annular space which conveys a recirculation flow of fluid during operation of the pump, an improvement for alleviating damage associated with said recirculation flow, the improvement comprising; a plurality of vent holes located about the outer periphery of the inducer shroud and extending therethrough for conveying said recirculation flow from said annular space back into said shrouded inducer.
Claim 3
Dependent Claim
18 words
The pump of claim 1 wherein said holes are located adjacent a high pressure end of said inducer.
Claim 4
Dependent Claim
25 words
The pump of claim 1 wherein said inducer is an axial flow inducer with an inlet end and an opposite end terminating adjacent an impeller.
Claim 5
Dependent Claim
22 words
The pump of claim 3 wherein said inducer has a plurality of blades and said holes are located substantially equidistant the blades.
Claim 6
Dependent Claim
22 words
The pump of claim 1 wherein said inducer has a plurality of blades and said holes are located substantially equidistant the blades.
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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |