Measuring and testing – Volume or rate of flow – By measuring thrust or drag forces
Patent
1998-01-09
1999-09-28
Oen, William
Measuring and testing
Volume or rate of flow
By measuring thrust or drag forces
7386171, G01F 130, G01F 128
Patent
active
059592184
ABSTRACT:
The disclosure relates to improved methods of designing surfaces whereby to minimize the effects of changes in the coefficients of friction between so-called bulk fluids and the surfaces. The disclosure also relates to surfaces designed in accordance with the methods.
A device embodying the invention, for metering the mass flow of bulk material, such as grain or other crop material, comprises a sensor member with a curved surface installed adjacent the outlet of a conveyor. The sensor member is mounted for pivoting about a transverse axis and is subject to a moment resulting from the material flow along its surface. A spring means is provided to keep the sensor member in zero load position. The displacement of the sensor member is proportional to the mass flow rate. Changing friction coefficients .mu. between the bulk material and the surface will affect the flow pattern therealong, but an array of length and/or inlet orientation angles can be found relative to which the measured moments remain substantially insensitive to these flow changes.
Such metering devices may be used in grain and forage harvesters, wherein they need less recalibration under varying harvesting conditions.
REFERENCES:
patent: 4067238 (1978-01-01), Oetiker
patent: 4765190 (1988-08-01), Strubbe
patent: 5343761 (1994-09-01), Myers
patent: 5495773 (1996-03-01), Olesen
patent: 5752545 (1998-05-01), Vienneau et al.
patent: 5763652 (1998-04-01), Strubbe
patent: 5837906 (1998-11-01), Palmer
Clark Robin
Miller Larry W.
New Holland North America Inc.
Oen William
Seemar Frank A.
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