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US3708246A
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Electromagneti pumps for liquid metals
Assignee: OTDEL FIZIKO TEKHNICHESKIKH PROBLEM ENERGETIKI URALSKOGO NAUCHNO
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Filing: 1971-07-12
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Granted: 1973-01-02
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Expires: 1991-07-12
Abstract
Abstract A gapless and an air-gap magnetic circuit are separated by a clearance which accommodates a straight conduit conveying a liquid metal. The air-gap magnetic circuit is the multipole core of an A.C. electromagnet and serves to establish a magnetic field in the liquid metal. The gapless magnetic circuit is a polyphase transformer with single-turn secondary windings formed by the liquid metal and a conductor enveloping the transformer core. The gapless magnetic circuit induces an electric current in the liquid metal. The magnetic field and the electric current interact to produce an electromagnetic head.
Inventors
- 👤 R Radchenko
- 👤 S Mokrushin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:58
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
168 words
An electromagnetic pump for liquid metals, comprising: a practically straight conduit for the liquid metal to be handled; a gapless and an air-gap magnetic circuit separated by a clearance accommodating said conduit; said gapless and air-gap circuits respectively induce in the metal an electric current and a magnetic field which are at right angles to each other and interact to produce an electromagnetic head moving said metal in said conduit; said air-gap magnetic circuit being a multi-pole a.c. electromagnet and said gapless magnetic circuit being a polyphase transformer with as many pairs of primary and secondary windings as there are poles in the multipole electromagnet; said secondary windings being formed by said liquid metal in portions of said conduit where the current and field interact and by a conductor which together with the liquid metal envelopes a core of said transformer; and the number of said poles in the air-gap magnetic circuit and of secondary windings is a multiple of the number of phases in said power source.
Claim 2
Dependent Claim
168 words
An electromagnetic pump for liquid metals, comprising: a practically straight conduit for the liquid metal to be handled; a gapless and an air-gap magnetic circuit separated by a clearance accommodating said conduit; said gapless and air-gap circuits respectively induce in the metal an electric current and a magnetic field which are at right angles to each other and interact to produce an electromagnetic head moving said metal in said conduit; said air-gap magnetic circuit being a multi-pole a.c. electromagnet and said gapless magnetic circuit being a polyphase transformer with as many pairs of primary and secondary windings as there are poles in the multipole electromagnet; said secondary windings being formed by said liquid metal in portions of said conduit where the current and field interact and by a conductor which together with the liquid metal envelopes a core of said transformer; and the number of said poles in the air-gap magnetic circuit and of secondary windings is a multiple of the number of phases in said power source.
Claim 3
Dependent Claim
28 words
An electromagnetic pump, as in claim 1, in which the secondary conductors in the outer openings of the transformer core are offset from center towards the outer walls.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |