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Environmentally safe pump including seal

  • US 5,499,902 A
  • Filed: 01/17/1995
  • Issued: 03/19/1996
  • Est. Priority Date: 12/04/1991
  • Status: Expired due to Fees
First Claim
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1. A motor driven pump comprising:

  • a motor housing having disposed therein a motor for rotatably driving a rotating shaft, said rotating shaft extending from said motor and being at least partially located within a pump housing;

    said pump housing being connected to said motor housing, said pump housing including a pump chamber in which fluid to be pumped is pumped between a fluid inlet and a fluid outlet;

    a pumping member affixed to said rotating shaft and disposed within said pump chamber;

    a piston seal located along said shaft between said motor and said pumping member;

    a fluid repeller located along and affixed to said shaft between said pump chamber and said piston seal, said fluid repeller including a plurality of radially outward extending portions substantially parallel to one another, said radially outward extending portions working together with a plurality of fixed radially inward extending members so as to resist the flow of fluid from said pump chamber toward said piston seal; and

    wherein said piston seal includes;

    (a) a rotating annular sealing surface fixedly attached to said shaft for rotation therewith;

    (b) a non-rotating annular sealing member opposing said rotating sealing surface; and

    (c) a piston for applying pressure to the rear of said non-rotating annular sealing member so that the front of said non-rotating sealing member creates a seal with said rotating sealing surface.

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  • 5 Assignments
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