Patent US3767321A successfully refreshed from Google Patents.
US3767321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal means for axial flow pump and the like
Assignee: Individual
•
Filing: 1972-05-26
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Granted: 1973-10-23
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Expires: 1992-05-26
Abstract
Abstract Disclosed is means for preventing leakage from about the shaft of an axial flow pump, the shaft extending through a housing wall. The means includes a sleeve for the shaft which is fixed at one end to the housing wall and is flared at its other end adjacent the pump impeller. The flared end forms a housing for a centrifugal pump rotor on the shaft, the centrifugal pump rotor being arranged to pump counter to the axial flow pump to prevent liquid from rising in the sleeve and leaking from about the shaft.
Inventors
- 👤 R Layne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:54
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/106
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
180 words
An axial flow pump comprising: a. an upright pump housing with an outlet adjacent the top thereof, the top of said housing being closed by an end wall having an opening therethrough; b. an impeller shaft extending down through said opening into said housing including an axial flow impeller on said shaft for pumping liquid through said housing and outlet; c. a sleeve disposed about said shaft, said sleeve having an upper end rigidly fixed to said end wall about said opening in a liquid tight seal and a lower end formed with an outwardly flared portion, the outer diameter of said sleeve being smaller than the outer diameter of said impeller; and d. a centrifugal pump rotor on said shaft and located in said flared portion, said flared sleeve portion forming a centrifugal pump housing for said rotor with said rotor and flared portion arranged for pumping liquid from within said sleeve in a direction axially opposed to the direction of flow from said axial flow impeller, whereby liquid is prevented from leaking through said opening about said shaft.
Claim 2
Dependent Claim
180 words
An axial flow pump comprising: a. an upright pump housing with an outlet adjacent the top thereof, the top of said housing being closed by an end wall having an opening therethrough; b. an impeller shaft extending down through said opening into said housing including an axial flow impeller on said shaft for pumping liquid through said housing and outlet; c. a sleeve disposed about said shaft, said sleeve having an upper end rigidly fixed to said end wall about said opening in a liquid tight seal and a lower end formed with an outwardly flared portion, the outer diameter of said sleeve being smaller than the outer diameter of said impeller; and d. a centrifugal pump rotor on said shaft and located in said flared portion, said flared sleeve portion forming a centrifugal pump housing for said rotor with said rotor and flared portion arranged for pumping liquid from within said sleeve in a direction axially opposed to the direction of flow from said axial flow impeller, whereby liquid is prevented from leaking through said opening about said shaft.
Claim 3
Dependent Claim
29 words
An axial flow pump as set forth in claim 1, wherein said axial flow impeller includes a portion comprising said centrifugal pump rotor disposed in said sleeve flared portion.
Claim 4
Dependent Claim
22 words
An axial flow pump as set forth in claim 2, wherein said hub portion is generally conical and provided with vane means.
Claim 5
Dependent Claim
24 words
An axial flow pump as set forth in claim 3, wherein said vane means comprise axially extending grooves formed in said conical hub portion.
Claim 6
Dependent Claim
64 words
An axial flow pump as set forth in claim 1 comprising: a. a hub on the lower end of said impeller shaft, said hub having a lower portion carrying said axial flow impeller and an upper portion; and b. said upper hub portion being conical in shape and fitting into said outwardly flared sleeve portion, said upper hub portion comprising said centrifugal pump rotor.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |