초록 ▼

A control system for a pump includes a level sensor switch that is positioned along a production string in an oil well shaft. The level sensor switch is protected from damage by inner and outer housings. A control circuit responsive to the level sensor switch is also provided. The control circuit in

A control system for a pump includes a level sensor switch that is positioned along a production string in an oil well shaft. The level sensor switch is protected from damage by inner and outer housings. A control circuit responsive to the level sensor switch is also provided. The control circuit includes an adjustable timer that is located at ground level remote from the harsh environment of the oil well shaft. The timer controls the operation time of the pump during each pumping cycle.

대표청구항 ▼

A control system for a pump adapted for pumping liquid from an oil well shaft through a production string comprising: a control circuit including timing means remotely located from said oil well shaft, said timing means maintaining operation of said pump for a predetermined period of time so as to p

A control system for a pump adapted for pumping liquid from an oil well shaft through a production string comprising: a control circuit including timing means remotely located from said oil well shaft, said timing means maintaining operation of said pump for a predetermined period of time so as to pump a selected volume of liquid from said well and maintain substantially the same volume of liquid in said well at the end of each pumping cycle; means for sensing the liquid level in said oil well shaft and actuating said timing means in response to said liquid rising to a predetermined level; and means for protecting said level sensing means from impact damage when said level sensing means is positioned in said oil well shaft.