Positive displacement flowmeter

Details Positive displacement flowmeter Positive displacement flowmeter

2011-01-18

2011-01-18

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

Expansible chamber

Reexamination Certificate

active

07870785

ABSTRACT:
A position displacement flowmeter having a pair of non-circular gears in a rolling contact on a pitch line without slippage. The positive displacement flowmeter comprises a casing and a pair of rotors provided in the casing and rotatable around its center axes. The pair of rotors, have a tooth profile curve which is an oval pitch curve itself having a trajectory of contact points on the pitch line, and they satisfy a condition of r1+r2=K=const r1dθ1=r2dθ2, and a moving radius of the oval pitch curve is given by ri=a/(1−b cos nθi) (i=1, 2), where “ri (i=1, 2)” is the moving radius that is a distance from a center of rotation to the oval pitch curve, “a” is a homothetic coefficient, “b” is a flattening, “n” is a number of lobes, and “θi (i=1, 2) is a moving angle.

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patent: 2001-027560 (2001-01-01), None
patent: 3310239 (2002-05-01), None

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