GB190804361A - Improvements in Choking Coils. - Google Patents

Abstract

4361. Marcom, R. K., and Morris, D. K. Feb. 26. Resistances inductive. Choking-coils of the type described in Specification No. 1517, A.D. 1907. are provided with a heat-proof wall interposed between the core and the surrounding winding, whereby a high temperature may be attained by the core without injuriously affecting the winding. As shown in Fig. 1, the windings a<1>, a<2> of the choking-coil are separated from the limbs b<1>, b<2> of the core by flat tubes c<1>, c<2> wound helically or otherwise, through which water is caused to flow upwards, the water being fed by a pipe d and conducted away by pipes e<1>, e<2>. The windings are separated by an interval to insulate them, or a refractory insulating- substance may be employed to fill the space. If the tubes are of metal, one is wound in a right-handed direction and the other in left-handed direction to eliminate secondary currents ; or the tubes may be connected by rubber tubing. As shown in Fig. 3, concentric walls f <1>, g<1> and f <2>, g<2> are provided, separated by helically or longitudinally corrugated partitions h<1>, h<2> connected at the bottom. Water is fed by a pipe d to the outer space i<1>, i<2>, passes up the inner space j<1>, j<2>, and escapes by pipes e<1>, e<2>. The partitions need not be corrugated. As shown in Fig. 4, a pair of circular tubes c<3>, c<4> are provided, being separated by stout cords m and surrounding an insulating-liner n. The tubes are provided with separate inlet and outlet pipes d<3>, d' and e<3>, e<4>. The walls, partitions, or tubes may be composed wholly or partly of vulcanized fibre.