Device for switching a submersible motor-driven pump on and off
First Claim
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1. A submersible pump, comprising:
- a pump housing member having an intake and an outlet and means in said housing member for displacing a liquid in which the pump is submerged from said intake to said outlet;
an electric motor having a motor casing member connected to said housing member, said motor being operatively connected to said means in said housing member for driving same;
a pressure sensor on one of said members and comprising a pressure-sensitive ohmic resistance; and
circuitry connected between said motor and said sensor for controlling energization of said pump, said pressure-sensitive ohmic resistance having two uniformly spaced apart conductors bridged by a polymeric foil decreasing in ohmic resistance upon application of pressure normal to said foil.
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Abstract
A device is provided for switching a submersible motor-driven pump on and off by a pressure sensor which measures the level of the liquid in the chamber enclosing the submersible motor-driven pump by the liquid pressure in the chamber, the pressure sensor being attached in or on the outside of the motor or pump casing and having a pressure-sensitive ohmic resistance.
35 Citations
7 Claims
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1. A submersible pump, comprising:
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a pump housing member having an intake and an outlet and means in said housing member for displacing a liquid in which the pump is submerged from said intake to said outlet; an electric motor having a motor casing member connected to said housing member, said motor being operatively connected to said means in said housing member for driving same; a pressure sensor on one of said members and comprising a pressure-sensitive ohmic resistance; and circuitry connected between said motor and said sensor for controlling energization of said pump, said pressure-sensitive ohmic resistance having two uniformly spaced apart conductors bridged by a polymeric foil decreasing in ohmic resistance upon application of pressure normal to said foil. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification