Sewage pump priming system
US5035583A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Mar 21, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7306
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum priming system for drawing liquid into the pumping chamber to prime a vertical shaft centrifugal pump for pumping sewage or the like. The vacuum priming system includes a priming pump for developing a partial vacuum in the pumping chamber and causing liquid to be drawn into the pumping chamber to evacuate air therefrom. A sensor is provided for detecting the interface between the liquid and air in an area in or above the pumping chamber for activating and deactivating the priming pump. The sensor comprises a low sensitivity capacitive proximity sensor having a generally vertical sensing face for sensing the relative movement of the interface between the liquid and air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.