Patent US4780066A successfully refreshed from Google Patents.
US4780066A
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Centrifugal pump having a magnetic coupling
Assignee: Sulzer AG
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Filing: 1987-05-19
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Granted: 1988-10-25
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Expires: 2007-05-19
Abstract
Abstract The centrifugal pump has a pump rotor unit which is housed within an impeller chamber and which is driven by a permanent magnet coupling having magnetic pole units and pole shoes outside the impeller chamber. The pole shoes define a gap into which an annular part of an end cover of the pump housing projects and into which a magnetizable annular part of the pump rotor unit projects to complete the magnetic flux circuit.
Inventors
- 👤 Ulrich Bolleter
- 👤 Erich Klaui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:24
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K49/104; H02K49/108; F; F04; F04D; F04D13/00; F04D13/02; F04D13/021; F04D13/024; F04D13/026; F04D13/027; F05; F05B; F05B2260/00; F05B2260/40; F05B2260/404; F05B2260/4041
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
92 words
A centrifugal pump comprising a pump rotor unit disposed within an impeller chamber; a permanent magnet coupling for driving said rotor unit, said coupling including a pair of magnetic pole units outside said impeller chamber and defining an annular gap therebetween and a magnetizable part on said rotor unit inside said impeller chamber and within said annular gap to complete a magnetic flux circuit; and a cover between said rotor unit and said pole units closing said impeller chamber and having an annular pocket receiving said magnetizable part of said rotor unit.
Claim 2
Dependent Claim
92 words
A centrifugal pump comprising a pump rotor unit disposed within an impeller chamber; a permanent magnet coupling for driving said rotor unit, said coupling including a pair of magnetic pole units outside said impeller chamber and defining an annular gap therebetween and a magnetizable part on said rotor unit inside said impeller chamber and within said annular gap to complete a magnetic flux circuit; and a cover between said rotor unit and said pole units closing said impeller chamber and having an annular pocket receiving said magnetizable part of said rotor unit.
Claim 3
Dependent Claim
28 words
A centrifugal pump as set forth in claim 1 wherein said rotor unit includes a shaft and a cup-shaped wheel on said shaft and defining said magnetizable part.
Claim 4
Dependent Claim
22 words
A centrifugal pump as set forth in claim 1 which further comprises a radially disposed disc having said magnetizable part mounted thereon.
Claim 5
Dependent Claim
22 words
A centrifugal pump as set forth in claim 1 wherein said rotor unit includes an impeller having said part extending axially therefrom.
Claim 6
Dependent Claim
19 words
A centrifugal pump as set forth in claim 1 which further comprises a corrosion-resistant coating on said magnetizable part.
Claim 7
Dependent Claim
18 words
A centrifugal pump as set forth in claim 1 wherein said magnetizable part is made of soft iron.
Claim 8
Dependent Claim
28 words
A centrifugal pump as set forth in claim 1 wherein said magnetic coupling includes a plurality of individual bar magnets defining a pair of annular magnetic pole units.
Claim 9
Dependent Claim
18 words
A centrifugal pump as set forth in claim 1 wherein said part and said pocket are axially disposed.
Claim 10
Dependent Claim
18 words
A centrifugal pump as set forth in claim 1 wherein said part and said pocket are radially disposed.
Claim 11
Dependent Claim
78 words
A centrifugal pump comprising a pump rotor unit disposed within an impeller chamber; a permanent magnet coupling for driving and rotor unit, said coupling including a pair of permanent magnet pole units outside said impeller chamber and defining an annular gap therebetween and a magnetizable part on said rotor unit inside said impeller chamber and within said annular gap to complete a magnetic flux circuit; and having an annular pocket receiving said magnetizable part of said rotor unit.
Claim 12
Dependent Claim
78 words
A centrifugal pump comprising a pump rotor unit disposed within an impeller chamber; a permanent magnet coupling for driving and rotor unit, said coupling including a pair of permanent magnet pole units outside said impeller chamber and defining an annular gap therebetween and a magnetizable part on said rotor unit inside said impeller chamber and within said annular gap to complete a magnetic flux circuit; and having an annular pocket receiving said magnetizable part of said rotor unit.
Claim 13
Dependent Claim
28 words
A centrifugal pump as set forth in claim 10 wherein said rotor unit includes a shaft and a cup-shaped wheel on said shaft and defining said magnetizable part.
Claim 14
Dependent Claim
23 words
A centrifugal pump as set forth in claim 10 wherein said rotor unit includes an impeller having said magnetizable part extending axially therefrom.
Claim 15
Dependent Claim
18 words
A centrifugal pump as set forth in claim 10 wherein said magnetizable part is made of soft iron.
Claim 16
Dependent Claim
46 words
A centrifugal pump as set forth in claim 10 which further comprises a pair of pole shoe rings mounted on respective pole units to define said annular gap, a disc mounting said pole units thereon and a drive shaft connected to said disc for rotation thereof.
Claim 17
Dependent Claim
106 words
A centrifugal pump comprising a pump rotor unit disposed within an impeller chamber; a permanent magnet coupling for driving said rotor unit, said coupling including a pair of magnetizable pole shoes outside said impeller chamber and defining an annular gap therebetween, a common permanent magnet ring of permanent magnetic material connected to said pole shoes and a magnetizable part on said rotor unit inside said impeller chamber and within said annular gap to complete a magnetic flux circuit; and a cover between said rotor unit and said pole shoes closing said impeller chamber and having an annular pocket receiving said magnetizable part of said rotor unit.
Claim 18
Dependent Claim
106 words
A centrifugal pump comprising a pump rotor unit disposed within an impeller chamber; a permanent magnet coupling for driving said rotor unit, said coupling including a pair of magnetizable pole shoes outside said impeller chamber and defining an annular gap therebetween, a common permanent magnet ring of permanent magnetic material connected to said pole shoes and a magnetizable part on said rotor unit inside said impeller chamber and within said annular gap to complete a magnetic flux circuit; and a cover between said rotor unit and said pole shoes closing said impeller chamber and having an annular pocket receiving said magnetizable part of said rotor unit.
Claim 19
Dependent Claim
19 words
A centrifugal pump as set forth in claim 15 which further comprises a corosion-resistant coating on said magnetizable part.
Claim 20
Dependent Claim
18 words
A centrifugal pump is set forth in claim 15 wherein said magnetizable part is made of soft iron.
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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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |