Air sampling pump system

Details Air sampling pump system Air sampling pump system

1992-08-28

1993-12-14

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 43, 417 45, 417 53, F04B 4906

Patent

active

052696596

ABSTRACT:
A pump is driven by a pump motor drive circuit that produces a series of pulse width modulated signals. A closed loop system is included to provide data indicative of any variation in the fluid flow. This is accomplished by using a Venturi located in the fluid flow path to create a pressure differential indicative of the fluid flow. A pressure transducer electronically measures this pressure differential which is then compared to a reference pressure differential indicative of the desired fluid flow. Any variation between the measured and desired fluid flow causes the pump motor drive circuit to vary the width of the pulses that are transmitted to the pump motor.

REFERENCES:
patent: 2408851 (1946-10-01), Hillier
patent: 4063824 (1977-12-01), Baker et al.
patent: 4397610 (1983-08-01), Krohn
patent: 4552513 (1985-11-01), Miller et al.
patent: 4756670 (1988-07-01), Arai
patent: 4781536 (1988-11-01), Hicks
patent: 5163818 (1992-11-01), Betsill et al.
Humphries, James T. and Sheets, Leslie P., Industrial Electronics, 3rd edition, 1989 pp. 293-296.

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