| 摘要 |
A vortex shedding flowmeter includes a vortex generating bluff body of elongated cylindrical shape disposed across a flow passage, a vortex sensor with signal generating means disposed downstream of the vortex generating bluff body, and a throttling means for constricting the flow passage disposed downstream of the bluff body such that the constriction increases the velocity of fluid flowing past the vortex sensor greatly magnifying the lift forces acting on the vortex sensor and thereby increasing the sensitivity thereof, wherein the throttling means is provided with a bias force causing constriction of the flow passage when the bias force overcomes the fluid dynamic force of the fluid flow at low flow rates and fluid dynamic force of the fluid flow causes the constriction to open up when fluid dynamic force overcomes the bias force of the throttling means.
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