Flow device having parallel flow surfaces which move toward and

Details Flow device having parallel flow surfaces which move toward and Flow device having parallel flow surfaces which move toward and

1997-01-29

1998-07-14

Oen, William L.

Measuring and testing

Volume or rate of flow

Using differential pressure

137 98, G01F 138, G05D 1100

Patent

active

057807485

ABSTRACT:
This disclosure provides a novel flow device having a fourth root pressure versus flow characteristic. The flow device includes an inlet, an orifice that focusses fluid pressure, a pair of parallel plates (or other surfaces which can be modeled as parallel plates), and an outlet. Preferably, the pair of parallel plates are a pair of two flat disks, one of which has a central aperture. When the device is used as a flow restrictor, the central aperture forms a seat against which the second plate (the impeder plate) is biased to restrict fluid flow. The orifice provides fluid pressure through the aperture, which forces the second plate away from the first plate, and against the bias. Fluid flow through the plates is directly proportional to displacement between the plates, and spent fluid escapes via a radial periphery of the second plate. Preferably, the second plate is mounted to a housing by a set of springs which also contain a strain gauge, such that displacement can be electronically measured. The flow restrictor of the present invention is expected to have particular application in the fields of biological and chemical analysis instruments.

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