US3767090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic valve for regulating the flow-rate of melt from a container
Assignee: E A AS
•
Filing: 1971-01-18
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Granted: 1973-10-23
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Expires: 1991-01-18
Abstract
Abstract The outflow rate of molten metal from a furnace or ladle is regulated by a multiphase electromagnetic valve surrounding an outlet of the furnace or ladle.
Inventors
- 👤 Y Sundberg
- 👤 E Svensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:30
CPC Classifications
B; B22; B22D; B22D39/00; B22D39/003; B22D39/006
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
Means for regulating the speed of melt flowing out of a container, comprising a multiphase electromagnetic valve pump arranged around an outlet in the container, said outlet being an upwardly directed tube, leading from the lower part of the container to a level below the highest possible melt level in the container, said valve pump being arranged around the tube and its coil being fed with multi-phase AC voltage with switchable phase sequence, the direction of the phase sequence being controlled from the output from measuring means for measuring the amount of melt, said valve pump comprising at least two sectioned coils, the ratio between the pole distributing ( Tau ) of said coils and the diameter of the same (d) being between 0.8 and 2.0.
Claim 2
Dependent Claim
126 words
Means for regulating the speed of melt flowing out of a container, comprising a multiphase electromagnetic valve pump arranged around an outlet in the container, said outlet being an upwardly directed tube, leading from the lower part of the container to a level below the highest possible melt level in the container, said valve pump being arranged around the tube and its coil being fed with multi-phase AC voltage with switchable phase sequence, the direction of the phase sequence being controlled from the output from measuring means for measuring the amount of melt, said valve pump comprising at least two sectioned coils, the ratio between the pole distributing ( Tau ) of said coils and the diameter of the same (d) being between 0.8 and 2.0.
Claim 3
Dependent Claim
26 words
Means according to claim 1, in which the pump comprises several consecutively located coils to cover the required transport distance, the coils suitably being multi-pole connected.
Claim 4
Dependent Claim
45 words
Means according to claim 1, characterised in that the outflow opening is so dimensioned that the inner diameter of the outflow tube is between 0.1 Square Root Rho and 0.3 Square Root Rho where Rho is the resistivity of the melt in ohm . mm2/m.
Claim 5
Dependent Claim
56 words
Means according to claim 1, in which inside the coils positioned about the outlet is placed at least one electrically conducting tube in which currents are induced under the influence of the field from the coil, so that heating is achieved in the conducting tube and heat losses from metal standing in the pump are counteracted.
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) | 1976-10-22 | 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 |