Patent US5061151A successfully refreshed from Google Patents.
US5061151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump system with liquid ring priming pump
Assignee: Sundstrand Corp
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Filing: 1990-02-22
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Granted: 1991-10-29
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Expires: 2010-02-22
Abstract
Abstract The problem of minimizing size and weight parameters in an impeller-type centrifugal pump system (10), including a liquid ring priming pump (32), is solved by providing a housing (12) defining a fluid inlet (26). An impeller (16) is rotatably mounted downstream of the inlet on a rotatable shaft (18). A pressure balance chamber (42) is located behind the impeller to provide for thrust balancing of the impeller. A first passage (44) extends directly through the impeller communicating inlet pressure with the balance chamber. The first passage has an inlet forward of the impeller blades. The liquid ring pump is rotatably mounted on the shaft and is located behind the balance chamber. A second passage (46) communicates the inlet pressure in the balance chamber with the liquid ring pump outside the rotating shaft.
Inventors
- 👤 James Steiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:49
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2261; F04D29/2277; F04D29/04; F04D29/041; F04D29/0416; F04D9/00; F04D9/04; F04D9/041
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
123 words
An impeller-type pump system, comprising: housing means defining a fluid inlet; impeller means rotatably mounted in the housing means downstream of the inlet, the impeller means including an inducer stage forward of a centrifugal impeller stage; a pressure balance chamber defined in the housing behind the impeller means to provide for thrust balance of the impeller means; first passage means through the impeller means, including an inlet in the inducer stage and an outlet in the centrifugal impeller stage, communicating pressure at the inlet with the pressure balance chamber; a liquid ring pump for priming the pump system, the liquid ring pump being located behind the centrifugal impeller means; and second passage means communicating the pressure balance chamber with the liquid ring pump.
Claim 2
Dependent Claim
123 words
An impeller-type pump system, comprising: housing means defining a fluid inlet; impeller means rotatably mounted in the housing means downstream of the inlet, the impeller means including an inducer stage forward of a centrifugal impeller stage; a pressure balance chamber defined in the housing behind the impeller means to provide for thrust balance of the impeller means; first passage means through the impeller means, including an inlet in the inducer stage and an outlet in the centrifugal impeller stage, communicating pressure at the inlet with the pressure balance chamber; a liquid ring pump for priming the pump system, the liquid ring pump being located behind the centrifugal impeller means; and second passage means communicating the pressure balance chamber with the liquid ring pump.
Claim 3
Dependent Claim
48 words
The impeller-type pump system of claim 1, including bearing means journalling the impeller means in the housing at a location behind the pressure balance chamber, said liquid ring pump being located behind the bearing means, and with said second passage means passing radially outwardly of the bearing means.
Claim 4
Dependent Claim
18 words
The impeller-type pump system of claim 2 wherein said second passage means are located in the housing means.
Claim 5
Dependent Claim
22 words
The impeller-type pump system of claim 1 wherein said impeller means include a hub, said first passage means extending through the hub.
Claim 6
Dependent Claim
55 words
The impeller-type pump system of claim 4 wherein said inducer stage of the impeller means include blade means defining a liquid running clearance between the blade means and the housing means, with said inlet means of the first passage means being located forward of a point where the blade means defines said liquid running clearance.
Claim 7
Dependent Claim
55 words
The impeller-type pump system of claim 1 wherein said inducer stage of the impeller means include blade means defining a liquid running clearance between the blade means and the housing means, with said inlet means of the first passage means being located forward of a point where the blade means defines said liquid running clearance.
Claim 8
Dependent Claim
34 words
The impeller-type pump system of claim 1 wherein said inducer stage of the impeller means include blade means, and said inlet means of the first passage means are located forward of the blade means.
Claim 9
Dependent Claim
177 words
An impeller-type pump system, comprising: housing means defining a fluid inlet; impeller means including an inducer stage forward of a centrifugal impeller stage, the inducer stage having blade means defining a liquid running clearance between the blade means and the housing means, and shaft means rotatably mounted in the housing means by bearing means behind the impeller means; a pressure balance chamber defined in the housing behind the impeller means forward of the bearing means to provide for trust balancing of the impeller means; first passage means through the impeller means, including an inlet located forward of a point where the blade means define said liquid running clearance, communicating inlet pressure with the pressure balance chamber; a liquid ring pump in the housing for priming the pump system, the liquid ring pump being driven by said shaft means and being located behind the bearing means on a side thereof opposite the impeller means; and second passage means communicating the pressure balance chamber with the liquid ring pump, the second passage means being located outside the shaft means.
Claim 10
Dependent Claim
177 words
An impeller-type pump system, comprising: housing means defining a fluid inlet; impeller means including an inducer stage forward of a centrifugal impeller stage, the inducer stage having blade means defining a liquid running clearance between the blade means and the housing means, and shaft means rotatably mounted in the housing means by bearing means behind the impeller means; a pressure balance chamber defined in the housing behind the impeller means forward of the bearing means to provide for trust balancing of the impeller means; first passage means through the impeller means, including an inlet located forward of a point where the blade means define said liquid running clearance, communicating inlet pressure with the pressure balance chamber; a liquid ring pump in the housing for priming the pump system, the liquid ring pump being driven by said shaft means and being located behind the bearing means on a side thereof opposite the impeller means; and second passage means communicating the pressure balance chamber with the liquid ring pump, the second passage means being located outside the shaft means.
Claim 11
Dependent Claim
24 words
The impeller-type pump system of claim 8 wherein said second passage means is located in the housing means and extends around the bearing means.
Claim 12
Dependent Claim
27 words
The impeller-type pump system of claim 8 wherein said impeller means include a hub with said blade means thereabout, said first passage means extending through the hub.
Claim 13
Dependent Claim
101 words
A centrifugal pump system, comprising: housing means; impeller means including an inducer stage forward of a centrifugal impeller stage, the inducer stage having blade means rotatably mounted in the housing means; a pressure balance chamber defined in the housing behind the impeller means; first passage means, including an inlet forward of the blade means, communicating the pressure balance chamber with a front side of the impeller means; a liquid ring pump for priming the pump system, the liquid ring pump being located behind the centrifugal impeller means; and second passage means communicating the pressure balance chamber with the liquid ring pump.
Claim 14
Dependent Claim
101 words
A centrifugal pump system, comprising: housing means; impeller means including an inducer stage forward of a centrifugal impeller stage, the inducer stage having blade means rotatably mounted in the housing means; a pressure balance chamber defined in the housing behind the impeller means; first passage means, including an inlet forward of the blade means, communicating the pressure balance chamber with a front side of the impeller means; a liquid ring pump for priming the pump system, the liquid ring pump being located behind the centrifugal impeller means; and second passage means communicating the pressure balance chamber with the liquid ring pump.
Claim 15
Dependent Claim
46 words
The centrifugal pump system of claim 11, including bearing means journaling the impeller means in the housing at a location behind the pressure balance chamber, said liquid ring pump being located behind the bearing means and with said second passage means passing around the bearing means.
Claim 16
Dependent Claim
18 words
The centrifugal pump system of claim 12 wherein said second passage means are located in the housing means.
Claim 17
Dependent Claim
27 words
The centrifugal pump system of claim 11 wherein said impeller means include a hub with said blade means thereabout, said first passage means extending through the hub.
Claim 18
Dependent Claim
158 words
An impeller-type pump system, comprising: housing means defining a fluid inlet; impeller means including an inducer stage forward of an impeller stage, the inducer stage having blade means and the impeller means having shaft means rotatably mounted in the housing means by bearing means behind the impeller means; a pressure balance chamber defined in the housing behind the impeller means forward of the bearing means to provide for thrust balancing of the impeller means; first passage means through the impeller means, including an inlet forward of the blade means, communicating the inlet with the pressure balancing chamber; a liquid ring pump in the housing for priming the pump system, the liquid ring pump being driven by said shaft means and being located behind the bearing means on a side thereof opposite the impeller means; and second passage means communicating the pressure balance chamber with the liquid ring pump, the second passage means being located outside the shaft means.
Claim 19
Dependent Claim
158 words
An impeller-type pump system, comprising: housing means defining a fluid inlet; impeller means including an inducer stage forward of an impeller stage, the inducer stage having blade means and the impeller means having shaft means rotatably mounted in the housing means by bearing means behind the impeller means; a pressure balance chamber defined in the housing behind the impeller means forward of the bearing means to provide for thrust balancing of the impeller means; first passage means through the impeller means, including an inlet forward of the blade means, communicating the inlet with the pressure balancing chamber; a liquid ring pump in the housing for priming the pump system, the liquid ring pump being driven by said shaft means and being located behind the bearing means on a side thereof opposite the impeller means; and second passage means communicating the pressure balance chamber with the liquid ring pump, the second passage means being located outside the shaft means.
Claim 20
Dependent Claim
24 words
The impeller-type pump system of claim 15 wherein said second passage means is located in the housing means and extends around the bearing means.
Claim 21
Dependent Claim
27 words
The impeller-type pump system of claim 15 wherein said impeller means include a hub with said blade means thereabout, said first passage means extending through the hub.
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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) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-28 | 2003-04-29 | 2003-10-29 | $7700.00 | Window Closed / Lapsed |