Measuring and testing – Blower – pump – and hydraulic equipment
Patent
1996-04-25
1997-07-22
Kwon, John T.
Measuring and testing
Blower, pump, and hydraulic equipment
7386175, G01M 1900
Patent
active
056494491
ABSTRACT:
In the disclosed method of determining the current or instantaneous operating conditions of a centrifugal pump, the radial forces impressed on the impeller shaft by the operatively rotating pump impeller are measured at a shaft-supporting bearing disposed proximate the pump housing and impeller. In a preliminary or test operation of the pump, this radial force measurement is taken at a plurality of volumetric liquid flow rates through the pump so as to develop a relationship between the radial force and liquid flow. Then, during normal operation of the pump, the current or instantaneous radial force is measured at the bearing and this measurement is compared to the previously-developed relationship to accurately determine the instantaneous operating conditions of the pump by identifying the point along the pump's characteristic curve--which defines for the pump a relationship between lifing height and volumetric liquid flow--at which the pump is currently operating.
REFERENCES:
patent: 3943891 (1976-03-01), Kinugawa
patent: 5329956 (1994-07-01), Marriott et al.
patent: 5383351 (1995-01-01), Kotlyar
ABS Pump Production AB
Kwon John T.
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