System for controlling electrical power in an internal wire impe

Details System for controlling electrical power in an internal wire impe System for controlling electrical power in an internal wire impe

1974-06-13

1977-01-11

Bartis, A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

137341, 138 33, 219 1051, 219510, 307 77, H05B 102, F24H 110, F16L 5300

Patent

active

040028810

ABSTRACT:
An apparatus for heating fluids includes a pipe through which the fluid to be heated flows having a ferromagnetic pipe attached in heat-transmitting relationship thereto. An insulated wire extends longitudinally through the ferromagnetic pipe and is electrically connected in series therewith. The secondary windings of a pair of transformers are connected in series with each other and the ferromagnetic pipe by the insulated wire and the primary windings of the transformers are connected to a source of alternating current. A control responsive to the temperature of the fluid in the fluid conveying pipe is provided for regulating the power output to the series connected ferromagnetic pipe and insulated wire by, in alternative embodiments, disconnecting the transformers from the circuit, reversing the polarity of one transformer secondary with respect to the secondary of the other or bypassing one of the transformers.

REFERENCES:
patent: 1567844 (1925-12-01), Hendricks
patent: 3293407 (1966-12-01), Ando
patent: 3523177 (1970-08-01), Ando
patent: 3571561 (1971-03-01), Ando
patent: 3755650 (1973-08-01), Ando

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