US3620642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: AR Wilfley and Sons Inc
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Filing: 1969-12-09
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Granted: 1971-11-16
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Expires: 1989-12-09
Abstract
Abstract A centrifugal pump includes an intake chamber means and a casing means having a follower plate means disposed therebetween. A runner or impeller means is mounted in the casing means and has the usual impeller vanes thereon. The follower plate means includes an annular lip extending toward the runner means and being disposed adjacent a labyrinth means on the runner means. In addition, the follower plate means includes an annular cap disposed radially outwardly of the runner means, this annular cap having a pair of sloping surfaces having different angular relationships to the axis of rotation of the runner means.
Inventors
- 👤 James B Studebaker
- 👤 George A Minick
- 👤 John D Whittier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:39
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/426; F04D29/4273; F04D29/08; F04D29/16; F04D29/165; F04D29/167; F04D29/18; F04D29/22; F04D29/2261; F04D29/2266; F04D7/00; F04D7/02; F04D7/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
A centrifugal slurry pump comprising intake chamber means, casing means defining volute means therein, a follower plate means disposed between said intake chamber means and said casing means, impeller means rotatably supported within said casing means and having pumping impeller vanes thereon, said impeller means including pressure relief means adjacent said follower plate means for reducing secondary circulation between the follower plate and impeller means, and means on said follower plate means and extending toward said impeller means to reduce wear occasioned by secondary circulation within the pump, said means on said follower plate means including an annular cap extending toward the impeller means and disposed radially outwardly of said pressure relief means, said annular cap having an inclined fluid-directing surface extending from said follower plate to receive material pumped by said pressure relief means and direct it into said volute means to reduce wear on the pump casing and increase the life and efficiency of the pump.
Claim 2
Dependent Claim
158 words
A centrifugal slurry pump comprising intake chamber means, casing means defining volute means therein, a follower plate means disposed between said intake chamber means and said casing means, impeller means rotatably supported within said casing means and having pumping impeller vanes thereon, said impeller means including pressure relief means adjacent said follower plate means for reducing secondary circulation between the follower plate and impeller means, and means on said follower plate means and extending toward said impeller means to reduce wear occasioned by secondary circulation within the pump, said means on said follower plate means including an annular cap extending toward the impeller means and disposed radially outwardly of said pressure relief means, said annular cap having an inclined fluid-directing surface extending from said follower plate to receive material pumped by said pressure relief means and direct it into said volute means to reduce wear on the pump casing and increase the life and efficiency of the pump.
Claim 3
Dependent Claim
36 words
Apparatus as defined in claim 1 wherein said means on the follower plate means further includes an annular lip for directing flow of material from the intake chamber means to the eye of the impeller means.
Claim 4
Dependent Claim
25 words
Apparatus as defined in claim 2 wherein said impeller means includes labyrinth means, said annular lip being disposed adjacent said labyrinth means and cooperating therewith.
Claim 5
Dependent Claim
33 words
Apparatus as defined in claim 1 wherein said inclined surface on said annular cap includes a first sloping surface extending at an oblique angle to the axis of rotation of the impeller means.
Claim 6
Dependent Claim
42 words
Apparatus as defined in claim 4 wherein said inclined surface on said annular cap includes a second sloping surface extending at an oblique angle to the axis of rotation of the impeller means greater than the angle of said first-mentioned sloping surface.
Claim 7
Dependent Claim
21 words
Apparatus as defined in claim 1 wherein said pressure relief means on said impeller means comprises pressure relief vanes formed thereon.
Claim 8
Dependent Claim
20 words
Apparatus as defined in claim 6 wherein said annular cap is disposed directly radially outwardly of said pressure relief vanes.
Claim 9
Dependent Claim
53 words
Apparatus defined in claim 1 wherein said impeller means is an open type, and said means on the follower plate means comprises an annular cap disposed directly radially outwardly of a portion of the vanes on said impeller means, said portion of said vanes on said impeller means comprising said pressure relief 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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |