| 摘要 |
CASE 2435 "IMPROVED PROCESS FOR THE MEASUREMENT OF WEIGHT FLOWRATES AND RELATED DEVICES" The process for the measurement of the weight flowrate of an outflowing fluid inside a pipe made oscillate by an impulse-generating unit at a certain frequency, and at a constant and controlled amplitude, consists in making said pipe constantly oscillate exactly at its twisting resonance frequency, in counteracting the oscillation of the pipe with at least a couple of brakes, performing a braking action which is proportional to the pipe shifting speed, and has an intensity larger than the intensity of the Coriolis forces acting on the pipe, in detecting the pipe shifting in the two symmetrical points of the pipe relatively to its middle, wherein the largest twisting deformation occurs, and finally in determining the differences in the amplitudes of the above-said two shifts, which difference is directly proportional to the desired flow-rate, but on condition that all disturbances have been eliminated. Furthermore, different forms of practical embodiment of measurement instruments operating according to the above-said process, as well as specific circuits for said process are taken into consideration. |
