| 摘要 |
PURPOSE:To improve the sensitivity and durability by detecting and gauging pressure changes based on the generation of a Karman's vortex which is performed in a fluid passing through a vortex generation body to meansure the flow velocity and the flow rate thereof. CONSTITUTION:A plate-shaped surface at other end of a cylindrical body 6 fastened on one end of a vortex generating body 2 or a tube body 1 faces a flow at the right angle and pressure conduction ports 5 on the side of the vortex generating body 2 are so arranged as to be positioned on both sides of the plate- shaped surface. With such an arrangement, when a fluid to be measured flowing through the tube body 1 passes through the vortex generating body 2, a Karman's vortex is generated alternately on both sides of the vortex generating body 2 according to the flow velocity. This Karman's vortex passes through pressure introduction ports 5 and 5 as pressure change to vary the pressure in a pressure detection chamber 4 delicately and converted into an electrical signal with a piezo-electric element 8. This can improve the sensitivity and the durability in the measurement of the flow velocity and the flow rate. |
