SUBMERSIBLE PUMP WITH INTEGRATED LIQUID LEVEL SENSING AND CONTROL SYSTEM

摘要

A submersible pump includes a pump housing forming a main compartment for receiving a pump impeller and having liquid entrance and exit openings. A sealed auxiliary compartment is formed as an integral part of the housing. A drive motor is coupled to the impeller. An electric-field sensor is mounted in the sealed auxiliary compartment for detecting the elevation of the surface of a liquid body adjacent the sealed auxiliary compartment. At least one controllable switch is connected in the power supply line for controlling the supply of power to the drive motor, and the electric-field sensor is connected to the controllable switch for opening and closing the switch in response to changes in the detected elevation of the surface of the liquid body.