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Pump Controller With External Device Control Capability

  • US 20110286859A1
  • Filed: 02/24/2011
  • Published: 11/24/2011
  • Est. Priority Date: 06/29/2006
  • Status: Abandoned Application
First Claim
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1. A fluid circulation system for a fluid receptacle with a fluid outlet through which fluid exits the receptacle, a fluid inlet for returning fluid to the receptacle, a pump for moving the fluid from the fluid outlet to the fluid inlet, a suction conduit providing fluid communication between the fluid outlet and the pump and a return conduit providing fluid communication between the pump and the fluid inlet, the power used to turn the pump depending upon flow resistance into and out of said fluid receptacle, comprising:

  • a variable speed motor couplable to the pump for turning it;

    a controller in electrical communication with said variable speed motor, said controller determining the amount of electrical power delivered to said variable speed motor and the rotational speed of said variable speed motor;

    an electrical load sensing circuit for sensing the electrical load on said variable speed motor in turning said pump;

    a vent valve coupled to the suction conduit and having at least two positions, a first position which fluidly connects the suction conduit to matter outside the suction conduit and a second position which isolates the suction conduit from matter outside the suction conduit;

    said controller having an output that triggers said vent valve to assume the first position when said electrical load sensing circuit senses a load level indicative of a restricted flow of fluid into said suction conduit.

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