Impeller arrangement in a measuring device
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United States of America Patent
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-
Apr 3, 2001
Grant Date -
N/A
app pub date -
Feb 4, 1999
filing date -
Feb 12, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention relates to an impeller being rotated around an axis for a mass flow measuring device receiving inflow of material through an inlet tube. To improve the measurement accuracy, the fan character of the impeller is reduced. This is obtained by two design principles which can be combined. The impeller includes a number of mainly radially directed vanes. That side of each vane along which the measured material flows is formed as a duct with a cross-sectional area which decreases in the direction from the center of the impeller. The other principle is to reduce the airflow by use of an upside down bowl shaped cowling placed over the impeller.
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