Vortex fluid meter incorporating a double obstacle

A vortex fluid meter including:

• a pipe portion of constant inside diameter D in which the fluid flows,
• at least two obstacles, i.e. an upstream obstacle and a downstream obstacle disposed in the middle of the fluid flow in said pipe portion and adapted to generate main fluid vortices in an oscillatory manner, each of said obstacles having a generally elongate shape with longitudinal and transverse dimensions perpendicular to the direction of flow of the fluid, and
• means for detecting the signal corresponding to the oscillations of said vortices and for deducing therefrom the volume of fluid, characterized in that the upstream obstacle of longitudinal dimension h has two larger faces perpendicular to the direction of flow of the fluid and spaced by a distance t, an upstream face of transverse dimension d greater than the transverse dimension of the downstream face and two symmetrical smaller lateral faces each at an angle .beta. substantially between 30 and 70 degrees, to said upstream face, the downstream obstacle being in two parts joined together in a T-shape configuration, the first part with longitudinal dimension h and transverse dimension l having two parallel larger faces, i.e. an upstream faceparallel to the downstream face of said upstream obstacle and at a distance d.sub.1 from the latter and a downstream face, and two smaller faces, the second part having two larger faces with the same dimensions and parallel to the direction of flow of the fluid and two parallel smaller faces with the same dimensions and perpendicular to the direction of flow of the fluid.