Importance

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Abstract

For measuring a preferably heterogeneous mass stream there is a class of measuring apparatus that uses a rotary member carried by a shaft and driven at constant speed, said rotary member deflecting radially the mass stream acting axially upon the rotary member, thereby giving it a tangential velocity component. The torque dependent on the mass stream is measured on the shaft. For this purpose a first spur wheel is provided on the shaft, that meshes with a second spur wheel. The second spur wheel is mounted in a carrier member that is in turn mounted so as to rotate about the axis of the shaft and held in position by a forcesensing device. To improve the measuring sensitivity the second spur wheel has a second toothed engagement opposite the first spur wheel with an internal toothed wheel rim which is also mounted so as to rotate about the axis of the shaft and set rotating by a driving pinion. A rotational body set rotating in the same direction as the shaft is in frictional engagement with the carrier member and/or the first spur wheel. The strength of the hydrodynamic frictional engagement is coordinated in such a way that the moments of friction of the first and second spur wheels are compensated by the moment of friction of the frictional engagement.

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First Claim