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US3779668A
Expired / Lapsed
US
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Stage for a centrifugal pump
Assignee: McNeil Corp
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Filing: 1972-05-11
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Granted: 1973-12-18
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Expires: 1992-05-11
Abstract
Abstract Disclosed is an improved stage adaptable for use in multistage centrifugal pumps which find their primary use in moving liquids from deep wells and the like. The pump can include a motor, rotatable drive shaft, external casing and at least one of the improved stages, each stage having an impeller to impart velocity to the liquid and a diffuser to reduce velocity and increase the pressure to force the liquid to the successive stages and to the pump outlet. The impeller is rotated within a stage housing, nonrotatably mounted within the pump casing, and includes a front and rear plate having vanes therebetween which spiral outwardly from the center to the outer edge of the front plate. The front plate extends radially outwardly of the rear plate and terminates in an axially directed flange having a diameter approximating that of the stage housing but clearanced to rotate therein. Liquid thus exits the impeller axially and is received by the overlying diffuser with a minimum of turbulence.
Inventors
- 👤 W Ekey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:36
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2238; F04D29/2255; F04D1/00; F04D1/06; F04D1/063; Y; Y10; Y10S; Y10S415/00; Y10S415/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
203 words
A stage for a centrifugal pump having an axially extending driven shaft comprising a housing, impeller means within said housing for receiving and imparting velocity to a fluid material, and diffuser means fixed to said housing for decreasing the velocity and increasing the pressure of the fluid material, said impeller means including a hub rotatably driven by the driven shaft, a first plate, a substantially flat second plate extending radially from said hub, and vane members joining said first plate and said second plate, said first plate having a diameter greater than that of said second plate and peripherally terminating in an axially directed flange, said vane members extending outward from approximate said hub to the outer diameter of said first plate and beyond the outer diameter of said second plate and extending axially above said first plate and generally axially even wirh said second plate so that the fluid material received by said impeller means passes between adjacent of said vane members and said first and second plates and is guided around the outer end of said second plate to be turned by said axially directed flange of said second plate and axially expelled from said impeller means to said diffuser means.
Claim 2
Dependent Claim
203 words
A stage for a centrifugal pump having an axially extending driven shaft comprising a housing, impeller means within said housing for receiving and imparting velocity to a fluid material, and diffuser means fixed to said housing for decreasing the velocity and increasing the pressure of the fluid material, said impeller means including a hub rotatably driven by the driven shaft, a first plate, a substantially flat second plate extending radially from said hub, and vane members joining said first plate and said second plate, said first plate having a diameter greater than that of said second plate and peripherally terminating in an axially directed flange, said vane members extending outward from approximate said hub to the outer diameter of said first plate and beyond the outer diameter of said second plate and extending axially above said first plate and generally axially even wirh said second plate so that the fluid material received by said impeller means passes between adjacent of said vane members and said first and second plates and is guided around the outer end of said second plate to be turned by said axially directed flange of said second plate and axially expelled from said impeller means to said diffuser means.
Claim 3
Dependent Claim
138 words
A stage for a centrifugal pump as in claim 1, wherein said diffuser means includes a hub, a first plate extending radially from said hub, a second plate, a series of peripheral passages for the ingress of fluid material from said impeller means, said passages defined by crescent shaped vane members joining said first plate and said second plate and having concave and convex surfaces, by helical fin means for directing the fluid material between the concave surface of one said vane member and the convex surface of an adjacent said vane member, by said housing, and by said first and second plates of said diffuser means so that fluid material directed by said axially directed flange is guided by said passages from said first plate of said diffuser means to said second plate of said diffuser means.
Claim 4
Dependent Claim
24 words
A stage for a centrifugal pump as in claim 2, wherein said hub of said diffuser means receives said hub of said impeller means.
Claim 5
Dependent Claim
98 words
A stage for a centrifugal pump as in claim 2, wherein said helical fin means are affixed to the periphery of said first plate of said diffuser means and to said housing, said series of peripheral passages for the ingress of the fluid material being further defined by vane extension members fixed to said housing, the fluid material entering said diffuser means on said helical fins and passes first between a convex surface of said vane member and said housing to further contact said vane extension member prior to contacting the concave surface of said adjacent vane member.
Claim 6
Dependent Claim
58 words
A stage for a centrifugal pump as in claim 2, wherein said second plate of said diffuser means extends to the periphery of said housing, said second plate of said diffuser means having an aperture therethrough concentric with and of a larger diameter than said hub of said diffuser means for the egress of the fluid material therefrom.
Claim 7
Dependent Claim
49 words
A stage for a centrifugal pump as in claim 5, wherein said vane members of said diffuser means are carried by said first plate of said diffuser means and extend radially outwardly from said aperture of said second plate of said diffuser means to the periphery of said housing.
Claim 8
Dependent Claim
22 words
A stage for a centrifugal pump as in claim 1, wherein said vane members include inner vane segments and outer vane segments.
Claim 9
Dependent Claim
32 words
A stage for a centrifugal pump as in claim 7, wherein said inner vane segments are carried by said second plate and said outer vane segments are carried by said first plate.
Claim 10
Dependent Claim
32 words
A stage for a centrifugal pump as in claim 7, wherein said outer vane segments extend radially to the periphery of and axially above said axially directed flange of said first plate.
Claim 11
Dependent Claim
39 words
A stage for a centrifugal pump as in claim 1, wherein said first plate has an aperture therethrough concentric with and of a larger diameter than said hub for the ingress of the fluid material into said impeller means.
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |