Patent US4844691A successfully refreshed from Google Patents.
US4844691A
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Centrifugal liquid pump with cavitation surge suppression
Assignee: Sundstrand Corp
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Filing: 1987-12-30
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Granted: 1989-07-04
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Expires: 2007-12-30
Abstract
Abstract A centrifugal liquid pump includes an impeller and a hub for the impeller, whereby gases entrained in the liquid are separated from the liquid and collect near the hub by centripetal action. A shaft is connected to the hub for rotating the impeller, and a passageway extends axially through the shaft. A gas entry is provided near the hub in communication with the passageway. An air pump is provided at an opposite end of the shaft for evacuating the separated gases collected near the hub. The air pump is independent of and remote from the impeller and is in communication with the passageway extending axially through the shaft.
Inventors
- 👤 John H. Hallman
- 👤 Theodore C. Powers
- 👤 Peter B. Thomas, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:04
CPC Classifications
F; F04; F04D; F04D9/00; F04D9/001; F04D9/002; F04D9/003
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
126 words
In a centrifugal liquid pump having an impeller and a hub for the impeller, gases entrained in the liquid being separated from the liquid and being collected near the hub by centripetal action, shaft means connected to the hub for rotating the impeller, passageway means extending axially through the shaft, gas entry means near the hub in communication with the passageway means, and air pump means independent of and remote from the impeller for evacuating only the separated gases collected near the hub, the air pump means being in communication with the passageway means extending axially through the shaft means, said air pump means creating a vacuum in said passageway to thereby draw said gas near said hub through said passageway and propel said gas away.
Claim 2
Dependent Claim
126 words
In a centrifugal liquid pump having an impeller and a hub for the impeller, gases entrained in the liquid being separated from the liquid and being collected near the hub by centripetal action, shaft means connected to the hub for rotating the impeller, passageway means extending axially through the shaft, gas entry means near the hub in communication with the passageway means, and air pump means independent of and remote from the impeller for evacuating only the separated gases collected near the hub, the air pump means being in communication with the passageway means extending axially through the shaft means, said air pump means creating a vacuum in said passageway to thereby draw said gas near said hub through said passageway and propel said gas away.
Claim 3
Dependent Claim
21 words
In a centrifugal liquid pump as set forth in claim 1, wherein said air pump means is of a vacuum type.
Claim 4
Dependent Claim
20 words
In a centrifugal liquid pump as set forth in claim 2, wherein said air pump means comprises a ring pump.
Claim 5
Dependent Claim
38 words
In a centrifugal liquid pump as set forth in claim 1, wherein said impeller is located near one end of the shaft means and the air pump means is located near an opposite end of the shaft means.
Claim 6
Dependent Claim
37 words
In a centrifugal liquid pump as set forth in claim 4 wherein said one end of the shaft means extends beyond the impeller and said gas entry means is located in the shaft means beyond the impeller.
Claim 7
Dependent Claim
22 words
In a centrifugal liquid pump as set forth in claim 5 wherein said gas entry means extends perpendicular to the shaft means.
Claim 8
Dependent Claim
40 words
In a centrifugal liquid pump as set forth in claim 1, wherein said gas entry means is located near one end of the shaft means and the air pump means is located near an opposite end of the shaft means.
Claim 9
Dependent Claim
36 words
In a centrifugal liquid pump as set forth in claim 1 wherein one end of the shaft means extends beyond the impeller and said gas entry means is located in the shaft means beyond the impeller.
Claim 10
Dependent Claim
22 words
In a centrifugal liquid pump as set forth in claim 8 wherein said gas entry means extends perpendicular to the shaft means.
Claim 11
Dependent Claim
22 words
In a centrifugal liquid pump as set forth in claim 1 wherein said gas entry means extends perpendicular to the shaft means.
Claim 12
Dependent Claim
127 words
In a centrifugal liquid pump which includes an impeller and a hub for the impeller whereby gases entrained in the liquid are separated from the liquid and collected near the hub by centripetal action, and a shaft connected to the hub for rotating the impeller, the improvement comprising a passageway extending axially through the shaft, gas entry means near the hub in communication with the passageway, and an air pump for evacuating the separated gases collected near the hub, the air pump being independent of and remote from the impeller and being in communication with the passageway extending axially through the shaft, said air pump creating a vacuum in said passageway to thereby draw said gas near said hub through said passageway and propel said gas away.
Claim 13
Dependent Claim
127 words
In a centrifugal liquid pump which includes an impeller and a hub for the impeller whereby gases entrained in the liquid are separated from the liquid and collected near the hub by centripetal action, and a shaft connected to the hub for rotating the impeller, the improvement comprising a passageway extending axially through the shaft, gas entry means near the hub in communication with the passageway, and an air pump for evacuating the separated gases collected near the hub, the air pump being independent of and remote from the impeller and being in communication with the passageway extending axially through the shaft, said air pump creating a vacuum in said passageway to thereby draw said gas near said hub through said passageway and propel said gas away.
Claim 14
Dependent Claim
14 words
The improvement of claim 11, wherein said air pump is of a vacuum type.
Claim 15
Dependent Claim
13 words
The improvement of claim 12, wherein said air pump comprises a ring pump.
Claim 16
Dependent Claim
29 words
The improvement of claim 11, wherein said impeller is located near one end of the shaft and the air pump is located near an opposite end of the shaft.
Claim 17
Dependent Claim
31 words
The improvement of claim 11, wherein said gas entry means is located near one end of the shaft and the air pump is located near an opposite end of the shaft.
References Cited (Backward Citations)
US2463251A
Cited
US2422956A
Cited
FR1061171A
Cited
US2758815A
Cited
US2985108A
Cited
US3257782A
Cited
US3188968A
Cited
US3213797A
Cited
US3982913A
Cited
US4273562A
Cited
US4410337A
Cited
US4645518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |