Pumps – Diverse pumps – Priming with liquid level responsive control
Patent
1990-03-21
1991-07-30
Rivell, John
Pumps
Diverse pumps
Priming with liquid level responsive control
137392, F04D 904
Patent
active
050355830
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.
REFERENCES:
patent: 3519369 (1970-09-01), Weis
patent: 3558012 (1971-01-01), Weis
patent: 3630637 (1971-12-01), Repp
patent: 4390793 (1983-06-01), John
patent: 4515517 (1985-05-01), Sloan
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patent: 4613802 (1986-09-01), Kraus
patent: 4739786 (1988-04-01), Parkinson
patent: 4800755 (1989-01-01), Fathaver et al.
patent: 4809129 (1989-02-01), Hansen et al.
Bulletin entitled "Proxistor" by Huntleigh Technology plc.
Bulletin entitled "Posi Switch Proximity Switches" by Electrical & Electronic Controls, Inc., Bulletin No. 103.
Publication entitled "P&F Proximity Sensors".
Publication entitled "Threaded Barrel Capacitive Proximity Limit Switches" by General Electric Co., 1986.
Rivell John
Smith & Loveless, Inc.
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