Fluid flow measuring apparatus
AssigneeNissan Motor Co., Ltd.
InventorsTakeshi Fujishiro, Hiroshige Ozawa
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Abstract
A Karman vortex type flow rate measuring apparatus is provided with a plurality of vortex shedding members each having a different effective width, and a plurality of vortex detecting elements. The distance between the vortex detecting elements is so selected that it coincides with the distance between the vortices of some one of the vortex trains induced by respective vortex shedding members. The apparatus enables a positive and accurate detection of the vortices, and a compensation for drop out of the vortex shedding.
Claims8
An apparatus for measuring flow rate of a fluid by detecting Karman vortices and comprising a conduit through which the fluid is permitted to flow, vortex shedding means disposed within the conduit and extending across the flow direction of the fluid, and at least two vortex detecting means disposed downstream of the vortex shedding means and spaced from each other by an amount corresponding to the distance between the vortices, the vortex shedding means comprising a plurality of vortex shedding members each having a different effective size, said effective size of any one vortex shedding member being the size required to produce a given distance between vortices generated by that one vortex shedding member, each distance between the vortex detecting means being selected to be within the range between the maximum and the minimum distance between the vortices shed by said members.
Dependencies are inferred from the claim text.