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Pump using shape memory alloys

  • US 5,622,482 A
  • Filed: 10/30/1995
  • Issued: 04/22/1997
  • Est. Priority Date: 10/31/1994
  • Status: Expired due to Fees
First Claim
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1. A pump comprising:

  • a body having a cylinder formed on one side thereof with an intake port for introducing a fluid, an exhaust port for externally discharging the fluid introduced into the cylinder, a drain port formed on a lower portion of the cylinder for discharging the fluid introduced to the lower portion of the cylinder, and a drain flow passage for connecting the drain port to intake port, said body having a lower portion opened;

    a piston mounted to be able to slide within the cylinder, permitting the fluid to flow into the cylinder while moving from a first position to a second position, and discharging the fluid introduced in the cylinder via the exhaust port while moving from the second position to the first position;

    an end cap mounted with a pair of electric terminals and coupled to the lower portion of said body to tightly close the cylinder of said body;

    a biasing means installed between a lower end of said piston and an upper end of said end cap for exerting a biasing force to maintain said piston at the first position and for moving said piston from the second position to the first position; and

    a shape memory alloy member suspended to an outer circumference of a connecting pin penetrating through a lower portion of said piston and connected to the electric terminals of said end cap for moving said piston from the first position to the second position while overcoming the biasing force of said biasing means when a electric power is supplied via the electric terminals.

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