Measuring and testing – Volume or rate of flow – Using turbine
Patent
1995-04-14
1997-01-21
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Using turbine
7386189, 138 44, G01F 110, F15D 102
Patent
active
055961525
ABSTRACT:
Flow straightener for eliminating vortices in a gas stream through a flow tube. The flow straightener consists of a plate with a circular symmetric hole pattern, wherein the diameter of the holes is smaller than 0.1 times the diameter of the flow tube. The passage area of the holes is between 0.4 and 0.8 times the passage area of the flow tube. The diameter of the largest hole is bigger than 1.3 times the diameter of the smallest hole. The thickness of the plate is between 0.8 and 1 times the square root of the average passage area of the holes. The plate is disposed upstream in front of a turbine-wheel gas meter, which is mounted, so as to run on bearings, on a cylindrical body. In the annular gap between the cylindrical body and the flow tube, a second flow straightener is arranged consisting of a number of vanes, the ratio of the height of the vanes and the spacing between the vanes being between 0.8 and 1.
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patent: 4503712 (1985-03-01), Vigneaux
patent: 5341848 (1994-08-01), Laws
Bergervoet Josephus T. M.
Oostendoys Franciscus J. G. M.
Amrozowicz Paul D.
Chilcot Richard
Instromet B.V.
Jaskiewicz Edmund M.
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