US4021136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: Westinghouse Electric Corp
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Filing: 1976-02-11
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Granted: 1977-05-03
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Expires: 1996-02-11
Abstract
Abstract A centrifugal pump for use in pumping hot liquids under pressure. A rotatable shaft, having an impeller at its lower end, is positioned along the axis of a generally cylindrical pump casing. The pump casing has a suction nozzle at its lower end, and a discharge nozzle near the upper end. A cylindrical outer shell surrounds the shaft within the casing, and a flange on the outer shell is secured to the top of the casing. A cylindrical inner shell is positioned inside the outer shell, surrounding the shaft, and a space is formed between the inner shell and the outer shell. The space provides an effective thermal barrier to protect the shaft. A bearing assembly for the shaft is secured to the inner shell, and a cooler is positioned between the bearing assembly and the impeller, thereby protecting the bearing assembly from the heat of the fluid being circulated by the pump. Seals are inserted within the inner shell above the bearing assembly, and these seals confine the high-pressure liquid within the pump.
Inventors
- 👤 Frank Sabino, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:24
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/046; F04D29/047; F04D29/0462; F04D29/58; F04D29/586; F04D29/588; F04D29/60; F04D29/64; F04D29/648
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
301 words
A vertically positioned centrifugal pump for circulating a liquid comprising: a generally cylindrical casing open at one end, said casing having a discharge nozzle and a suction nozzle formed therein; a rotatable shaft extending along the axis of said casing; an impeller attached adjacent a lower end of said shaft, said impeller being generally positioned in the path between said suction nozzle and said discharge nozzle; a generally cylindrical axially extending outer shell positioned within said casing and coaxial with said casing, said outer shell having a flange extending radially outwardly from the upper periphery thereof, said outer shell flange being secured to the top of said casing, said casing, said outer shell, and said outer shell flange forming an area therebetween through which said liquid to be circulated flows; a generally cylindrical axially extending inner shell positioned within said outer shell and coaxial with said outer shell, said inner shell having an outwardly radial extension around the lower portion thereof, said inner shell being hermetically secured to said outer shell at said inner shell radial extension, said inner shell at the upper portion thereof being spaced apart from said outer shell flange, said inner shell and said outer shell forming an annular first space therebetween, in open communication with the exterior of said casing, said inner shell and said shaft forming an annular second space therebetween; a bearing assembly secured to said inner shell in said second space, said bearing assembly rotatably receiving said shaft; means for sealing said second space secured to said inner shell, said means for sealing said second space being positioned vertically above said bearing assembly, said means for sealing said second space receiving said shaft; and an annular cooler positioned within said second space vertically below said bearing assembly, said cooler rotatably receiving said shaft.
Claim 2
Dependent Claim
301 words
A vertically positioned centrifugal pump for circulating a liquid comprising: a generally cylindrical casing open at one end, said casing having a discharge nozzle and a suction nozzle formed therein; a rotatable shaft extending along the axis of said casing; an impeller attached adjacent a lower end of said shaft, said impeller being generally positioned in the path between said suction nozzle and said discharge nozzle; a generally cylindrical axially extending outer shell positioned within said casing and coaxial with said casing, said outer shell having a flange extending radially outwardly from the upper periphery thereof, said outer shell flange being secured to the top of said casing, said casing, said outer shell, and said outer shell flange forming an area therebetween through which said liquid to be circulated flows; a generally cylindrical axially extending inner shell positioned within said outer shell and coaxial with said outer shell, said inner shell having an outwardly radial extension around the lower portion thereof, said inner shell being hermetically secured to said outer shell at said inner shell radial extension, said inner shell at the upper portion thereof being spaced apart from said outer shell flange, said inner shell and said outer shell forming an annular first space therebetween, in open communication with the exterior of said casing, said inner shell and said shaft forming an annular second space therebetween; a bearing assembly secured to said inner shell in said second space, said bearing assembly rotatably receiving said shaft; means for sealing said second space secured to said inner shell, said means for sealing said second space being positioned vertically above said bearing assembly, said means for sealing said second space receiving said shaft; and an annular cooler positioned within said second space vertically below said bearing assembly, said cooler rotatably receiving said shaft.
Claim 3
Dependent Claim
18 words
The pump according to claim 1 including a diffuser extending generally upwardly from said impeller within said casing.
Claim 4
Dependent Claim
18 words
The pump according to claim 2 including means for directing liquid from said diffuser to said discharge nozzle.
Claim 5
Dependent Claim
53 words
The pump according to claim 1 wherein said cooler comprises at least one coil for circulating a cooling liquid therein, said inner shell having an inlet opening therein, said inner shell inlet opening being in fluid communication with said coil, and means for supplying a cooling liquid to said inner shell inlet opening.
Claim 6
Dependent Claim
39 words
The pump according to claim 4 wherein said inner shell has an outlet opening therein, said inner shell outlet opening being in fluid communication with said coil, and means for removing cooling liquid from said inner shell outlet opening.
References Cited (Backward Citations)
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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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |