Method of counterflow through a pump and method of controlling t

Details Method of counterflow through a pump and method of controlling t Method of counterflow through a pump and method of controlling t

1993-08-04

1995-10-10

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

73660, 415 26, 340683, G01H 1700

Patent

active

054561159

ABSTRACT:
A method of detecting a counterflow in a pump comprises providing with detecting means for detecting variations in the discharge pressure of the pump and signal analyzing means for analyzing oscillation components contained in an output signal from the pressure detecting means, and detecting the pump's operating point to have entered a counterflow characteristic operation region when a waveform of the detection signal generated in association with the variations in the discharge pressure of the pump exhibits a predetermined spectrum distribution. Further, when it is detected that the operating point enters a counterflow characteristic operation region, the escape from that region is performed by temporally throttling the guide vane and temporally increasing the rotating speed.

REFERENCES:
patent: 3705516 (1972-12-01), Reis
patent: 3731526 (1973-05-01), Games
patent: 3901620 (1975-08-01), Boyce
patent: 4399548 (1983-08-01), Castleberry
patent: 4425798 (1984-01-01), Nagai et al.
patent: 4980844 (1990-12-01), Demjanenlco et al.

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