Importance

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Abstract

A fluid volumetric flowmeter has a wall plate forming a chamber and a fluid inlet, and a fluid outlet. Two rotors positioned within the chamber have intermeshing lobes and valleys for turning in the chamber as fluid flows from the inlet through the chamber to the outlet. At least one of the rotors has a radial recess for receiving a magnet. A shaft mount is connected to the wall plate. A response shaft is rotationally mounted in the shaft mount, and an indicator rotates with the shaft. A first magnetic coupling is mounted in the rotor recess. A second magnetic coupling is mounted on the shaft within the rotor hub and within the first magnetic coupling for rotating the second magnetic coupling, the shaft, and the indicator in response to rotation of the rotors. First paired coin-shaped magnets are aligned on magnetic axes extending diametrically through the rotor axis. Second grouped coin-shaped magnets are aligned on the single magnetic axis within the rotor hub.

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First Claim