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Enclosed sump pump

  • US 4,087,204 A
  • Filed: 08/09/1976
  • Issued: 05/02/1978
  • Est. Priority Date: 12/19/1974
  • Status: Expired due to Term
First Claim
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1. In a submersible sump pump apparatus comprising electric motor means, a vertically positioned shaft rotated by said motor means, an impeller secured to the lower end of the shaft, an enclosure about the impeller through which liquid is pumped from the sump, and control means including a liquid level sensor device for controlling the starting and stopping of said motor means in response to the level of liquid in said sump, the improvement comprising:

  • a housing having an upper and a lower end, said housing having an opening therethrough for the entry of said liquid, said housing being fluid tight above said opening whereby air will be trapped in the housing and said liquid will not rise significantly above a given level in the housing no matter how high the liquid rises in the sump outside the housing;

    said motor means being positioned in said housing above said given level whereby said liquid cannot reach said motor means thereby eliminating the necessity of a seal about the shaft and other measures to protect the motor means from the liquid;

    said motor means comprising an alternating current motor forming the primary source of power for rotating the impeller, and a direct current motor forming an alternative source of power as for example during periods when alternating current is not available; and

    said sensor device including two pressure sensitive actuator means positioned at a location outside said sump, and fluid conduit means having an open end through which fluid can enter so that the fluid pressure in the conduit means corresponds to the fluid pressure at said open end, said conduit means having another end communicating with said actuator means so that the fluid pressure in said actuator means corresponds to the fluid pressure at said open end, said open end being within said housing, one of said actuator means initiating the energization of the alternating current motor when the liquid in said sump reaches a first level, the other of said actuator means initiating the energization of the direct current motor when the liquid in said pump reaches a second level, said second level being above said first level.

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