Flow sensor having a fixed resistance and a variable resistance

Details Flow sensor having a fixed resistance and a variable resistance Flow sensor having a fixed resistance and a variable resistance

1997-10-22

1999-11-09

Patel, Harshad

Measuring and testing

Volume or rate of flow

Using differential pressure

G01F 122

Patent

active

059792477

ABSTRACT:
A flow sensor which is used for measuring the flow rate of a gas is disclosed. The flow sensor comprises a flow tube for allowing a gas to be circulated therethrough, a resistance is arranged so as to go across the inside of the flow tube, and pressure ports arranged on a tubular wall of the flow tube. The resistance includes a fixed resistance and a variable resistance. The fixed resistance is a block being fixed to a circumferential wall of the flow tube and closing part of a flow path of the flow tube. Parallel plates are arranged in the block so as to confront the two pressure ports, respectively, and so as to extend in parallel to the gas flowing direction. The two pressure ports are positioned within areas defined by the parallel plates, respectively. The variable resistance is an orifice membrane having a flap, an outer circumference of the membrane being fixed to an inner circumference of the flow tube, the flap forming an aperture in the middle of the membrane while being displaced in a direction of flow of the gas.

REFERENCES:
patent: 4083245 (1978-04-01), Osborn
patent: 5033312 (1991-07-01), Stupecky
patent: 5038621 (1991-08-01), Stupecky
patent: 5088332 (1992-02-01), Merilainen et al.
patent: 5379650 (1995-01-01), Kofoed et al.

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