Classifying – separating – and assorting solids – Fluid suspension – Gaseous
Patent
1989-06-26
1991-04-09
Huppert, Michael S.
Classifying, separating, and assorting solids
Fluid suspension
Gaseous
73 2801, B07B 700
Patent
active
050062271
ABSTRACT:
A volumetric flow controller is used in connection with a virtual impactor classifier to control two separate flows in separate lines from an air pump. Each line has a flow control valve controlled in response to flow signals that are obtained from a pressure transducer that provides an electrical signal proportional to pressure. Pressure changes are sensed and the provided electrical signal is compared with a reference and will actuate a damper motor and move a flow control butterfly valve in the flow line for adjusting the flow when the pressure signal is different from the reference. The circuitry used provides for a dead band, so that changes in the butterfly valve setting will not occur unless the flow varies a selected amount, and also a timer control is used so that the motor operating the damper will be operated only at selected time intervals to prevent "hunting" or continuous operation of the valves. Further, temperature compensation signals can be provided as desired. The ability to control the flow volume provides for more accurate aerosol sampling and cut off points for the size of particles being sampled.
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Behm Steven M.
Burton Robert M.
Marple Virgil A.
Huppert Michael S.
MSP Corporation
Wacyra Edward M.
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