Patent US3949567A successfully refreshed from Google Patents.
US3949567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump assembly
Assignee: K S B KERNKRAFTWERKSPUMPEN GmbH
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Filing: 1974-01-10
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Granted: 1976-04-13
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Expires: 1994-01-10
Abstract
Abstract A centrifugal pump assembly for use in nuclear reactor plants has a vertical motor shaft, a vertical pump shaft which is coaxial with and is located below and spaced apart from the motor shaft, an intermediate shaft which is coaxial with and is located between the pump shaft and motor shaft, a flexible coupling between the lower end of the motor shaft and the upper end of the intermediate shaft, and a rigid coupling between the upper end of the pump shaft and the lower end of the intermediate shaft. The intermediate shaft is rotatable in radial and/or axial bearings which are installed in a stationary housing, and the intermediate shaft is movable axially of the housing between a lower end position in which the rigid coupling is engaged and a raised position in which the rigid coupling is disengaged and the bearings and/or seals for the pump shaft are accessible.
Inventors
- 👤 Peter Stech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:14
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/021; Y; Y10; Y10S; Y10S464/00; Y10S464/901; Y10T; Y10T403/00; Y10T403/51; Y10T403/57; Y10T403/5706
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
In a centrifugal pump assembly, particularly in an upright centrifugal pump assembly for use in nuclear reactor plants, a combination comprising a motor shaft; a pump shaft coaxial with and spaced apart from said motor shaft; a stationary housing intermediate said shafts; an intermediate shaft coaxial with said first mentioned shafts and rotatable in said housing; bearing means provided in said housing for said intermediate shaft; a first coupling between said motor shaft and said intermediate shaft; and a second coupling between said pump shaft and said intermediate shaft, said intermediate shaft being movable axially in said housing relative to said motor shaft and said pump shaft between first and second positions in which said second coupling is respectively engaged and disengaged.
Claim 2
Dependent Claim
122 words
In a centrifugal pump assembly, particularly in an upright centrifugal pump assembly for use in nuclear reactor plants, a combination comprising a motor shaft; a pump shaft coaxial with and spaced apart from said motor shaft; a stationary housing intermediate said shafts; an intermediate shaft coaxial with said first mentioned shafts and rotatable in said housing; bearing means provided in said housing for said intermediate shaft; a first coupling between said motor shaft and said intermediate shaft; and a second coupling between said pump shaft and said intermediate shaft, said intermediate shaft being movable axially in said housing relative to said motor shaft and said pump shaft between first and second positions in which said second coupling is respectively engaged and disengaged.
Claim 3
Dependent Claim
15 words
A combination as defined in claim 1, wherein said first coupling is a flexible coupling.
Claim 4
Dependent Claim
72 words
A combination as defined in claim 2, wherein said flexible coupling comprises a first coupling element on said motor shaft, a second coupling element on said intermediate shaft, and a third coupling element arranged to transmit torque from said first to said second coupling element, at least in said first position of said intermediate shaft, at least one of said second and third coupling elements being movable axially with said intermediate shaft.
Claim 5
Dependent Claim
67 words
A combination as defined in claim 3, wherein said third coupling element is a sleeve having first internal teeth meshing with external teeth provided on said first coupling element and second internal teeth meshing with external teeth provided on said second coupling element, said one coupling element being said second coupling element and said second coupling element being movable with said intermediate shaft axially of said sleeve.
Claim 6
Dependent Claim
15 words
A combination as defined in claim 1, further comprising an apertured enclosure supporting said housing.
Claim 7
Dependent Claim
15 words
A combination as defined in claim 1, wherein said second coupling is a rigid coupling.
Claim 8
Dependent Claim
46 words
A combination as defined in claim 6, wherein said rigid coupling comprises a first coupling element provided on said pump shaft and a second coupling element provided on said intermediate shaft and mating with said first coupling element in said first position of said intermediate shaft.
Claim 9
Dependent Claim
99 words
A combination as defined in claim 6, wherein said intermediate shaft has an end face provided with a first set of teeth and said pump shaft has an end face provided with a second set of teeth mating with the teeth of said first set in the first position of said intermediate shaft, said teeth forming part of said rigid coupling and said rigid coupling further comprising means for normally holding said intermediate shaft against axial movement from said first position to thereby maintain the teeth of said first set in mesh with the teeth of said second set.
Claim 10
Dependent Claim
25 words
A combination as defined in claim 1, wherein said intermediate shaft is located at a level above said pump shaft but below said motor shaft.
Claim 11
Dependent Claim
228 words
In a centrifugal pump assembly, particularly in an upright centrifugal pump assembly for use in nuclear reactor plants, a combination comprising a motor shaft; a pump shaft coaxial with and spaced apart from said motor shaft; a stationary housing intermediate said shafts; an intermediate shaft coaxial with said first mentioned shafts and rotatable in said housing; friction bearing means provided in said housing for said intermediate shaft; a first coupling between said motor shaft and said intermediate shaft; and a rigid second coupling between said pump shaft and said intermediate shaft, said intermediate shaft being movable axially in said housing between first and second positions in which said second coupling is respectively engaged and disengaged, said intermediate shaft having an end face provided with a first set of teeth and said pump shaft having an end face provided with a second set of teeth mating with the teeth of said first set in the first position of said intermediate shaft, said teeth forming part of said second coupling and said second coupling further comprising means for normally holding said intermediate shaft against axial movement from said first position to thereby maintain the teeth of said first set in mesh with the teeth of said second set, said means for holding comprising a composite sleeve surrounding said sets of teeth and connecting said pump shaft to said intermediate shaft.
Claim 12
Dependent Claim
228 words
In a centrifugal pump assembly, particularly in an upright centrifugal pump assembly for use in nuclear reactor plants, a combination comprising a motor shaft; a pump shaft coaxial with and spaced apart from said motor shaft; a stationary housing intermediate said shafts; an intermediate shaft coaxial with said first mentioned shafts and rotatable in said housing; friction bearing means provided in said housing for said intermediate shaft; a first coupling between said motor shaft and said intermediate shaft; and a rigid second coupling between said pump shaft and said intermediate shaft, said intermediate shaft being movable axially in said housing between first and second positions in which said second coupling is respectively engaged and disengaged, said intermediate shaft having an end face provided with a first set of teeth and said pump shaft having an end face provided with a second set of teeth mating with the teeth of said first set in the first position of said intermediate shaft, said teeth forming part of said second coupling and said second coupling further comprising means for normally holding said intermediate shaft against axial movement from said first position to thereby maintain the teeth of said first set in mesh with the teeth of said second set, said means for holding comprising a composite sleeve surrounding said sets of teeth and connecting said pump shaft to said intermediate shaft.
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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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |