GB607821A - Electric powder control - Google Patents

Abstract

607,821. Electrically-actuated powder-seal valves. LINDE AIR PRODUCTS CO. Feb. 12, 1946, No. 4361. Convention date, March 31, 1945. [Class 135] [Also in Group XXX] In a method of controlling the flow of a stream of magnetizable powder, the powder is conducted through a conduit 8 of non-magnetic material and a magnetic field is established across the conduit of sufficient strength to magnetize the powder and thereby to influence its rate of flow. A magnetic field is produced across the conduit 8 by an electromagnet. The conduit is secured in position between polepieces 18 by plates 40 and screws 42, the openings 44 are provided in the polepieces 18 for electrical connections with the coil. The valve is enclosed in a non-magnetic housing 24 and a coil 22 is electrically connected to a source of electricity in a circuit including a switch and a rheostat. The coil 22 is wound between discs 27 on a cylinder 28 which fits an iron core 30 which has projections extending through iron yokes 36 to the top of which the iron polepieces 18 are secured by screws 38. The side cover and bottom cover 54 of non- magnetic material are secured to the yokes 36 by screws 56 and the space around the coil is filled with cement 60. In a modification, the conduit extends vertically through two similar valves. When the valves are energized alternatively and measured charge of powder is delivered, the amount being determined by the distance between the valves and indicated by a vertical scale mounted on the panel adjacent a pointer.