| 摘要 |
FIELD: physics. ^ SUBSTANCE: proposed flow transducer contains a measuring pipe made from dielectric material, on the outer surface of which is mounted a magnetic system in form of two inductance coils. Two electrodes are fitted in the cross section. The pipe is attached through flanges to a metal case on which a terminal box is fitted using a post. Wires run from the coils and electrodes through an opening in one of two terminal pieces, made from dielectric material and heat-resistant material, and an opening in the pole, to the terminal box, where they are soldered on a printed circuit board. The whole volume to the level of the terminal box, including the inner volume of the case, through the opening in the post, is filled with heat-resistant polyurethane foam. The filling material is fully compatible with the insulation of the wire of the coils and lead-out wires. The magnetic system is fixed about the case by a bolt in the opening of the second terminal piece. Earthing rings made from stainless steel are fitted on the flanges with press fitting on the inner diametre. The rings have straight and cone-shaped sections on their outer diametre. Electrode sealing is provided for by cone-shaped projections on the inner surfaces of the electrode head and metallic disc. ^ EFFECT: reliable operation in a wide range of temperature and pressure. ^ 4 dwg |
