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Dual action solenoid pump

  • US 4,221,548 A
  • Filed: 03/20/1978
  • Issued: 09/09/1980
  • Est. Priority Date: 03/20/1978
  • Status: Expired due to Term
First Claim
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1. A pump for moving a fluid comprising:

  • a body having first and second ends and a chamber open to said ends, said body having an inside wall surrounding the chamber, said wall having a plurality of longitudinal inwardly directed ribs, a first end member mounted on the first end of the body, a second end member mounted on the second end of the body, each of said end members having fluid inlet and fluid outlet passages, one-way inlet valve means in the inlet passages to control the flow of fluid into the opposite ends of the chamber, one-way outlet valve means in the outlet passages to control the flow of fluid out of the opposite ends of the chamber, a piston located in the chamber, said ribs being engageable with the piston to space the piston from the inside wall surrounding the chamber whereby a limited amount of fluid flows around the piston when the piston moves in the chamber, said piston being free to move in said chamber between the first and second end members, said piston including magnetic material, solenoid means for establishing sequential reverse magnetic force, and control means connected to the solenoid means to provide electric energy to energize the solenoid means whereby the sequential reverse magnetic force of the solenoid means acting on the magnetic material reciprocates the piston in the chamber, thereby moving fluid into and out of the opposite ends of the chamber through the inlet and outlet passages.

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