Flowmeter for gases
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United States of America Patent
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-
Apr 2, 1991
Grant Date -
N/A
app pub date -
Nov 14, 1989
filing date -
Nov 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flowmeter for gases has a rotor between two stators which consist of deflection blades, and an otpical system for detecting the rotation of the rotor and converting it into an electrical output signal. Each of the detector blades of the stators has a curved course between an inflow edge, where the blade from the hub to the periphery runs substantially in an axial plane, and an outflow edge, where the blade surface at each point thereof forms an angle with the axial direction which angle varies with the distance of each point from the hub. Preferably the blade face is at least partially formed by a circular cylindrical face, the central axis of the cylinder and the central axis of the stator being at an angle differing from 90 and the central axis of the stator lying in a tangent plane to the cylinder, and a flat face part, lying in an axial plane, connects the circular cylindrical part of the stator face to the inflow edge, the axial measurement of the flat face part decreasing from the hub to the peripheral edge.
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