| 摘要 |
PURPOSE:To obtain a two-phase flow measuring device which can measure the two- phase flow under high temp. and high pressure highly accurately by combining a diaphragm type density meter and a drag disc type current meter and measuring flow rate. CONSTITUTION:A drag disc type current meter 1 is installed to a pipe 9 in which fluid flows, by means of the torque tube 3 fitted to the wall surface of the pipe 9 and a rod 4 which transmits the deviation of the drag disc 2 to the torque tube 3. Further, permanent magnets 15 fixed to both sides of a diaphragm 13 by way of supporting rods 14 are provided behind this and the induced voltage detected by a vibration detecting coil 12 is applied to a driving coil 11 via an amplifier 16, whereby the vibrations of the diaphragm 13 are detected. The force acting upon the drag disc 2 is proportional to the product of the square of the velocity (v) of flow and density rho and the number of vibrations of the diaphragm 13 is proportional to the density rho of the fluid; therefore, if the signals obtainable from the respective flow meters are operated by (rhoXrhov<2>)<1/2> in an arithmetic part 20, mass flow rate rhov is determined. |
