Vortex flowmeter comprising a profiled duct

G - Physics – 01 – F

Patent

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Details

G01F 1/32 (2006.01)

Patent

CA 2185922

The present invention concerns a vortex fluid meter (1) comprising a pipe (2) having a maximum inside diameter D in which the fluid flows and having an internal profile comprising from the upstream end to the downstream end: a first pipe portion (4) progressively reducing the inside diameter of said pipe to a value D1 and having an inside wall (4a, 4b, 4c, 4d) at a continuously varying angle to the general direction of flow of the fluid; a second pipe portion (6) of constant diameter D1 in which is disposed at least one obstacle (8) adapted to generate oscillating fluid vortices; and a third pipe portion (20) returning the inside diameter of the pipe (2) to its original value D and adapted to separate the boundary layer of the fluid flow at a downstream end (6a) of said second pipe portion (6), and means (10, 12, 14, 16, 18, 200-221) for detecting the signal corresponding to the oscillations of the vortices and deducing the volume of fluid therefrom.

La présente invention a pour objet un compteur de fluide à tourbillons (1) comprenant une conduite (2) de diamètre intérieur maximal D dans laquelle s'écoule le fluide et formée d'un profil intérieur formé successivement d'amont en aval d'une première portion (4) réduisant progressivement le diamètre intérieur de ladite conduite à une valeur D1 et ayant une paroi intérieure (4a, 4b, 4c, 4d) qui forme avec la direction générale d'écoulement du fluide un angle continûment variable, d'une deuxième portion (6) de diamètre constant D1 dans laquelle est disposé au moins un obstacle (8) apte à générer des tourbillons de fluide oscillants et d'une troisième portion (20) de conduite ramenant le diamètre intérieur de ladite conduite (2) à sa valeur initiale D et étant apte à provoquer le décollement de la couche limite de l'écoulement du fluide au droit d'une extrémité dite aval (6a) de ladite deuxième portion (6) de conduite, ainsi que des moyens (10, 12, 14, 16, 18, 200-221) pour détecter le signal correspondat aux oscillations des tourbillons et pour en réduire le volume ou le débit de fluide.

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