| 摘要 |
PURPOSE:To improve durability of the device, by uniforming the force which rotates the impeller to rotate the impeller smoothly by providing the adjusting plate, which adjusts the area of the flow hole of the rectifier, concentrically for the flow of the fluid to be measured. CONSTITUTION:Instrumental error adjusting plate 30 is provided concentrically for the flow of the fluid to be measured, and this adjusting plate 30 is turned in the arrow direction to increase and reduce the area of flow hole A of rectifier 2, thereby adjusting the instrumental error. In this instrumental error adjustment, the fact that the relation of omega/Q is changed when area F of flow hole A is changed is utilized on a basis of the relational expression between the flow rate of the fluid to be measured and rotation of impeller 4 (Q, omega, C, r<->, F and theta are the flow rate to be measured, the angular velocity of the impeller, a constant, the average rotation radius of the impeller, the area of the flow hole, and the impeller angle respectively). Thus, the deflected flow is not generated in the fluid to be measured, and the force which rotates impeller 4 becomes uniform to rotate impeller 4 smoothly, and therefore, durability is improved. |
