Electromagnetic pump with built-in EM valve - has pump actuating coil and valve operating coil with magnetic paths sepd. from each other by non-magnetic portion

摘要

The electromagnetic pump includes an electromagnetic plunger actuating electromagnetic coil (4) and an electromagnetic valve operating electromagnetic coil (5) disposed coaxially in adjacent relationship and having magnetic paths of their own separated from each other by a non-magnetic portion, to obtain a desired magnetic flux distribution. The two electromagnetic coils have the same direction of windings to obtain an improved magnetic flux distribution, providing improved pump operation. By passing a half-wave rectified current or a pulse current of a predetermined cycle to the two electromagnetic coils connected in series with each other, a magnetic flud can be produced in each electromagnetic coil and made to flow in the magnetic path exclusive to each electromagnetic coil, so that mutual interference of the magnetic fluxes produced by the two electromagnetic coils can be avoided.