Method and apparatus for calibrating pumps

Details Method and apparatus for calibrating pumps Method and apparatus for calibrating pumps

1982-05-25

1984-02-21

Swisher, S. Clement

Measuring and testing

Blower, pump, and hydraulic equipment

73 3, G01M 1900, G01F 2500

Patent

active

044322305

ABSTRACT:
A method and apparatus are disclosed for calibrating the flow rate of a pump. The apparatus includes a high pressure pump, a critical flow orifice and a receptacle or air bag. The high pressure pump pumps a fluid, such as air, through the orifice into the receptacle at pressure sufficient to maintain the flow rate past the orifice in the critical region wherein flow rate is essentially independent of pressure. The receptacle is filled for a precisely determined time thereby providing a known amount of air in the receptacle. Through a valving arrangement the receptacle is then evacuated by the pump to be calibrated and the time required to evacuate the receptacle is determined. This permits calibration of the flow rate of the pump under test. An electronic circuit including a microprocessor automatically performs the timing functions and flow rate calculations.

REFERENCES:
patent: 2329042 (1943-09-01), Fuller
patent: 3125879 (1964-03-01), Porter
patent: 3226973 (1966-01-01), Evans et al.
Brooks Vol-U-Meter-Design Specifications, a Publication of Brooks Instrument Div., Emerson Elec. Co., Hatfield, Pa., 19440, Jul. 1979.

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