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Low power electromagnetic pump

  • US 4,569,641 A
  • Filed: 09/07/1982
  • Issued: 02/11/1986
  • Est. Priority Date: 09/07/1982
  • Status: Expired due to Term
First Claim
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1. An electromagnetic pump comprising:

  • (a) an elongated housing having a longitudinal axis and having an interior fluid containing region including a fluid receiving chamber and a fluid pumping chamber in fluid communication therewith, an inlet in fluid communication with said receiving chamber and an outlet in fluid communication with said pumping chamber;

    (b) check valve means operatively associated with said fluid containing region for allowing fluid flow in a direction from said inlet through said outlet and blocking fluid flow in a direction from said outlet through said inlet.(c) electromagnet means carried by said housing and located external to said fluid containing region;

    (d) an armature positioned in said fluid containing region of said housing for movement along said housing longitudinal axis and having a pole portion located for magnetic attraction by said electromagnet means and having a plunger portion in said pumping chamber for forcing fluid out of said chamber through said outlet, said armature being movably supported in said housing for movement from a rest position through a forward pumping stroke when attracted by said electromagnet means to force fluid out of said pumping chamber through said outlet and for movement in an opposite direction through a return stroke back to said rest position;

    (e) means for defining a magnetic circuit including said electromagnet means and said armature and a gap between said pole portion of said armature and said electromagnet means for moving said armature toward said electromagnet means to close said gap in response to electrical energization of said electromagnet means;

    (f) said armature pole portion having a pole face disposed in a plane substantially perpendicular to the direction of movement of said armature, said pole face being located to define said gap with said electromagnet means, said pole face being of relatively large area; and

    (g) said fluid containing region of said housing and said electromagnet being in axially spaced relation along said housing longitudinal axis and being separated by barrier means of fluid impervious material disposed substantially perpendicular to said housing longitudinal axis and having axially opposite side, said fluid containing region, inlet, outlet and armature all being located axially on one side of said barrier means and said electromagnet means being located axially on the opposite side of said barrier means.

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