Electromagnetic flow measuring tube and method of making same

Details Electromagnetic flow measuring tube and method of making same Electromagnetic flow measuring tube and method of making same

1991-11-01

1994-01-25

Chilcot, Jr., Richard E.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

7386111, G01F 158

Patent

active

052807274

ABSTRACT:
An electromagnetic flow measuring tube is manufactured by forming an inner member which consists substantially of plastic and thereafter coating the inner member with a material which has a lower coefficient of thermal expansion and a higher mechanical strength than the material of the inner member to form an outer member which surrounds the inner member in a form-stabilizing stiffening manner. Thus, when the inner member is formed from plastic in hot condition, as for instance by injection molding, it can cool down and solidify in a relaxed condition, so that it is free of intrinsic mechanical stresses when the outer member is applied. This eliminates the danger of a detachment of the inner member from the outer member and of subsequent occurrence of cracks in the material of the inner member. Mounting flanges, stiffening webs and other structural elements are integrally formed with the plastic inner member. This permits a simple and economic manufacture of flow measuring tubes having a complicated shape.

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