Method and apparatus for measuring flow rate

Details Method and apparatus for measuring flow rate Method and apparatus for measuring flow rate

1988-07-22

1990-07-03

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring thrust or drag forces

G01F 128

Patent

active

049380788

ABSTRACT:
A method and apparatus for measuring flow rate. A flow meter has a cylindrical interior with a substantially constant diameter over its full length, through which the fluid medium to be measured flows. A float element is movably mounted in a sealing manner within the interior of the housing. The flow of the fluid medium creates a force on the float which is preferably opposed by a spring with a progressive force charateristic. The float element includes a hollow cylinder forming an inner axial flow channel. The fluid medium flow is restricted by an orifice plate having an essentially circular orifice with a diameter considerably smaller than that of the hollow cylinder. The orifice plate is held in the hollow cylinder in a manner which allows replacement with another orifice plate having a different orifice. The particular orifice plate used is determined by the range of viscosity of the fluid to be measured. Starting from a lower limit of about 1 cSt. upward, the ratio of orifice plate thickness to orifice diameter increases with the upper limit of the viscosity range of the fluid, but remains between about 0.05 and 1.0.

REFERENCES:
patent: 1699163 (1929-01-01), Schiske
patent: 3766779 (1973-10-01), Hoffman
patent: 3835885 (1974-09-01), Kreyenberg
patent: 4166936 (1979-09-01), Tice
patent: 4573361 (1986-03-01), Kobold

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