Electromagnetic pump

Claim 1

In an electromagnetic pump designed for electricity conducting fluid comprising an external pipe (1) around which a magnetic yoke (11, 11') is installed in the form of plates (12) containing slots (14) in which a polyphase winding (35, 35') is housed, consisting of induction coils (29) with the same axis as the external pipe (1) and an internal pipe (5) installed inside the external pipe (1) with the same axis as the latter and containing a magnetic core (24) inside, capable of creating with the polyphase winding (35, 35'), a magnetic field applying a force to the fluid in duct (31) between the two pipes (1, 5) to make it flow axially, the improvement wherein the internal tube (5) is blocked and in that coils (19, 19') are each installed in a slot (14) and each consist of a first half-coil (29) and a second half-coil (19') terminating by involutes (20, 20'), the first half-coils (19) being coupled together electrically by their involutes (20) to form the first half-winding (35), the second half-coils (19') being coupled together electrically by their involutes (20) to form a second half-winding (35'), the said first and second half-windings (35, 35'), forming the polyphase winding and being installed on either side of joint plane passing through the axis of pipes (1, 5) and being housed in the magnetic half-yokes (11, 11') grouped along the joint plane to form the magnetic yoke, and in that duct (31) contains means of separation (29, 29') installed in the vicinity of the parts of the external pipe (1) not enveloped by the half-coils (19, 19'), the said means of separation (29, 29') separating the duct into two active half-ducts (32, 32')and preventing the hydraulic circulation of the fluid outside the active half-ducts (32, 32') but permitting electrical conduction between the two active half-ducts (32, 32').