Flow meter according to the vortex meter principle, measuring tube therefor and method for measuring the flow or the flow velocity of a medium

摘要

The invention discloses a measuring tube (10) for guiding a fluid, for a flow meter (1) according to the vortex meter principle, wherein the measuring tube has an inlet-side opening in an inlet-side end face and an outlet-side opening in an outlet-side end face, between which the measuring tube in axial Direction extends; a bluff body (15) disposed in the measurement tube (10), the bluff body serving to cause a Karman vortex street having a flow-dependent vortex frequency when fluid flows through the meter tube; at least one vortex detector (16) for detecting vortices of the vortex street and for providing vortex-dependent signals; characterized in that the measuring tube (10) axially spaced from the vortex detector between the vortex detector (16) and the outlet end face a throttle (14) which narrows the flow cross-section of the measuring tube annular (10).