GB693834A - Improvements in or relating to electro-magnetic pumps - Google Patents

Abstract

693,834. Dynamo - electric machines. MINISTER OF SUPPLY. July 23,1951 [Aug. 1, 1950], No. 19155/50. Class 35. Converting electric energy into motion of fluids by the action of magnetic fields.-In a pump which produces motion of a conducting liquid by the interaction of electric current and a magnetic field, the active current passes back through the gap in the iron circuit to prevent distortion in the distribution of the flux and current. In its simplest form, Fig. 3, the liquid flows along a flat duct 31, through which flux is passed vertically between polepieces 36, 37, while current passes from terminal 34, horizontally through the conducting liquid between insulating top and bottom members 33 and, leaving the liquid at electrode 35, returns by flat conductors 38, 39 to the other terminal 34a. In a more compact form, the return conductors are internally insulated, e.g. by varnish or refractory oxide and the top and bottom members of the tube are dispensed with. In a further modification, Fig. 5, the current, which enters at terminal 53 leaves the liquid at electrode 54 and returns to the other terminal 57 by a series of conductors 56 passing through slots 55 in the top polepiece 51. In Fig. 6, both directions of current flow are used to exert pumping action. The current passes from terminal 63 through the liquid in duct 60, through interconnector 64 to duct 61 and leaves by terminal 67. The ducts are joined by a loop 62 so that the liquid flows serially through the two ducts. In a modification, transverse flux is further reduced by spacing the ducts from each other and placing a stack of magnetic laminations between them so that flux can pass directly between them but not obliquely. The curvature of the flow path may in this way be reduced so that in the extreme case of Figs. 8 and 9 the liquid and current flow paths are in the same plane. In Fig. 8, the liquid flow path is straight along duct 81 and the laminated section 85 joins the two active sections, current passing from terminal 82 to terminal 83 through interconnector 84. In Fig. 9 the duct is looped at 90 so that the current path may be straight from terminal 93 to 95. Specifications 528,091, 557,986 and 567,772 are referred to.