Fluidic gas flowmeter with large flow metering range

Details Fluidic gas flowmeter with large flow metering range Fluidic gas flowmeter with large flow metering range

1992-05-01

1994-08-23

Chilcot, Jr., Richard E.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386195, 73195, G01F 700, G01F 120

Patent

active

053396952

ABSTRACT:
The present invention provides a wide range fluid flowmeter, having a body with a central air flow passage and a target in the air flow passage to direct fluid flow to one of the first and second flow loops. The fluid alternates between the first and second flow loops to create an oscillatory system, whose frequency can be measured to determine fluid flow rate. A preferred frequency measuring device is a piezoelectric diaphragm provided within the body of the flowmeter. In a preferred embodiment, a low flow rate sensor is provided in a nozzle of the flowmeter proximal the inlet to the body of the oscillatory, high flow rate flowmeter. The low flow rate sensor can incorporate a convection system which measures flow rates beyond the lower scale of the oscillatory flowmeter, thereby providing an apparatus and a method for measuring flow rates in a compact flowmeter, and with greater efficiency than previous apparatuses and methods. In its preferred embodiment, the low flow rate sensor is a time-of-flight (TOF) sensor provided in a constricted nozzle proximal the inlet to the oscillatory flowmeter.

REFERENCES:
patent: 4107990 (1978-08-01), Ringwall
patent: 4458709 (1984-07-01), Springer
patent: 4483200 (1984-11-01), Togawa et al.
patent: 4501144 (1985-02-01), Higashi et al.
patent: 4550614 (1985-11-01), Herzl
patent: 4565098 (1986-10-01), Herzl
patent: 4733559 (1988-03-01), Aine et al.
patent: 4838091 (1989-06-01), Markland et al.
patent: 5020373 (1991-06-01), Kamiunten et al.

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