Patent US4177015A successfully refreshed from Google Patents.
US4177015A
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Electromagnetic pumps
Assignee: Ricardo AEA Ltd
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Filing: 1978-03-09
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Granted: 1979-12-04
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Expires: 1998-03-09
Abstract
Abstract An electromagnetic pump wherein a core within a tubular housing defines an annular flow path for liquid metal, the core having helical windings of metal sheathed mineral insulated conductor and each winding comprising a plurality of loops arranged in series. The windings are in direct contact with the liquid metal and thereby reduce the magnetic gap normally required in such pumps.
Inventors
- 👤 Daniel F. Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:24
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/02; H02K44/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
An electromagnetic pump for liquid metal comprising a tubular pump housing, a core co-axially disposed within a bore of the housing to define an annular flow passage between the wall surface of the core and the wall surface of the bore, polyphase helical windings arranged co-axially with the core, the helical windings being located in equally angularly spaced helical slots formed in one of the wall surfaces, the windings of each phase comprising a plurality of loops of metal sheathed mineral insulated electrical conductor arranged in series and extending in each longitudinal direction along the wall surface within a discrete pair of diametrically opposed slots, each winding being adapted for connection to an external source of electricity supply.
Claim 2
Dependent Claim
118 words
An electromagnetic pump for liquid metal comprising a tubular pump housing, a core co-axially disposed within a bore of the housing to define an annular flow passage between the wall surface of the core and the wall surface of the bore, polyphase helical windings arranged co-axially with the core, the helical windings being located in equally angularly spaced helical slots formed in one of the wall surfaces, the windings of each phase comprising a plurality of loops of metal sheathed mineral insulated electrical conductor arranged in series and extending in each longitudinal direction along the wall surface within a discrete pair of diametrically opposed slots, each winding being adapted for connection to an external source of electricity supply.
Claim 3
Dependent Claim
27 words
An electromagnetic pump according to claim 1 wherein three-phase helical windings are located in six equally angularly spaced helical slots formed in the surface of the core.
Claim 4
Dependent Claim
21 words
An electromagnetic pump according to claim 2 wherein the windings of metal sheathed mineral insulated electrical conductor are of rectilinear cross-section.
Claim 5
Dependent Claim
24 words
An electromagnetic pump according to claim 3 wherein there is a plurality of vanes extending longitudinally along and radially across the annular flow passage.
Claim 6
Dependent Claim
21 words
An electromagnetic pump according to claim 1 wherein the windings of metal sheathed mineral insulated electrical conductor are of rectilinear cross-section.
References Cited (Backward Citations)
US3251302A
Cited
US3885890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |