Pump control system, level sensor switch and switch housing
US4972709A · kind A · utility
21Cited by
6References
6Claims
0Family size
Inventors
Key dates
| Filing date | Nov 13, 1989 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Nov 13, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/047
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A control system for a pump includes a level sensor switch that is positioned along a production string in an oil well shaft (S). 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 (S). The timer controls the operation time of the pump during each pumping cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.