US3644056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: Koninklijke Machinefabriek Stork BV
•
Filing: 1970-03-06
•
Granted: 1972-02-22
•
Expires: 1990-03-06
Abstract
Abstract A centrifugal pump comprising a vaned impeller which has an axial inlet wherein the impeller vanes at the inlet end are extend in the normal direction of rotation of the impeller and in the axial direction, the extension from that end of the inlet edge adjacent the impeller hub, to the other end thereof gradually increasing from zero to a maximum value, and the total extension with respect to an axial plane through that end of the inlet edge which is adjacent the hub covering an arc length equivalent to an angle of between 30* and 180*.
Inventors
- 👤 Samuel I Wiselius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:28
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2261; F04D29/2277
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
191 words
In a centrifugal pump having a drive shaft, a hub assembly fixed to said drive shaft for rotation therewith about the axis of said drive shaft, and a plurality of impeller vanes on said hub assembly, each impeller vane having a main body joined to said hub assembly along a line curving inwardly with respect to said axis and terminating at a base point spaced radially outwardly of said axis, the main body of each impeller vane also having an outer edge curving inwardly with respect to said axis and terminating in a tip point spaced radially outwardly from said axis and axially outwardly of said base point with there being an inner, inlet edge extending between said tip point and said base point, said outer edge being contoured to sweep in closely spaced relation of an associated portion of the pump casing, the improvement wherein: said tip point is located circumferentially beyond said base point with respect to the direction of rotation of saId shaft such that planes containing said axis and said base point and said tip point respectively include an angle having a value between 30* and 180*.
Claim 2
Dependent Claim
191 words
In a centrifugal pump having a drive shaft, a hub assembly fixed to said drive shaft for rotation therewith about the axis of said drive shaft, and a plurality of impeller vanes on said hub assembly, each impeller vane having a main body joined to said hub assembly along a line curving inwardly with respect to said axis and terminating at a base point spaced radially outwardly of said axis, the main body of each impeller vane also having an outer edge curving inwardly with respect to said axis and terminating in a tip point spaced radially outwardly from said axis and axially outwardly of said base point with there being an inner, inlet edge extending between said tip point and said base point, said outer edge being contoured to sweep in closely spaced relation of an associated portion of the pump casing, the improvement wherein: said tip point is located circumferentially beyond said base point with respect to the direction of rotation of saId shaft such that planes containing said axis and said base point and said tip point respectively include an angle having a value between 30* and 180*.
Claim 3
Dependent Claim
14 words
In a centrifugal pump as defined in claim 1 wherein said angle is 90*.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |