| 摘要 |
PURPOSE:To make flow-rate resistance very small, by providing linear blades at the blade tip parts of the first curved blade, which axially turns a fluid to be detected, and the second curved blade, which is provided at a downstream position in a 180 deg. point symmetrical manner with respect to the first curved blade. CONSTITUTION:A blade tip part 13 of an arc blade 11, which is the first curved blade that axially turns a fluid to be detected, is constituted of a linear blade, which is approximately in parallel with respect to an arrow 14 indicating the flowing direction in a flow path. An arc blade 16, which is the second curved blade, is provided in a 180 deg. point symmetrical manner with respect to the blade 11 at the downstream from a magnetic ball 15. A blade tip part 17 of the blade 16 is also formed by a linear blade which is approximately in parallel with the flowing direction 14. When the fluid to be detected flows in from the direction of the arrow 14, the fluid to be detected is aligned by the linear blade of the blade tip part 13 and flows along the arc blade 11. Thus the fluid is axially turned. As a result, a magnetic ball 15 placed in the turning flow is turned in a vertical plane with respect to the flow direction 14. The number of turning of the ball 15 is proportional to the flow rate. Therefore, by counting the number of turning of the ball 15, the flow rate can be measured. |
