Single staright tube coriolis flowmeter including exciters provided in two planes and perpendicular to each other

摘要

A single straight tube flowmeter has a body; a tube through which a flow of fluid passes; two systems of excitation of oscillations in two planes which are perpendicular to one another and including adaptor units; a block of processing of information data including a phase shift of the adaptors located in one plane, frequency of oscillations of the tube, and temperatures of the tube and the body and outputting results of measurement of a mass flow rate and density of the fluid; and components for imparting to the tube a rotary motion relative to its neutral immovable position to increase accuracy of measurements by suppressing vibration disturbances.

主权项

1. A single tube flowmeter, comprising a body; a tube through which a flow of fluid passes and which performs a rotating motion; two systems of oscillations in two planes which are perpendicular to one another and including adaptor units; a block of processing of information data including a phase shift of the adaptors located in one plane, frequency oscillations of the tube, and temperatures of the tube and the body and outputting results of measurement of a mass flow rate and density of the fluid; and an electronic block including a block of excitation of main oscillations, a block of excitation of perpendicular oscillations, a block of phase correction, and the block of processing of information data, wherein the block of excitation of main oscillations includes voltage amplifiers with inputs connected with outputs of the adaptors and outputs connected with a signal summator whose output is connected with a first input of a four-squared multiplier and, via an auto-regulator of amplification, with a second input of the four-squared multiplier whose exit, via an amplifier of power of the main oscillations is connected to winding of the block of excitation of the main oscillations, wherein the block of excitation of the squared oscillations includes power amplifiers whose inputs are connected with outputs of the adaptors of squared oscillations and outputs are connected with a signal summator whose input is connected via an auto-regulator of amplification to a second input of the four-squared multiplier whose output via an amplifier of power of the squared oscillations is connected to windings of the squared oscillations, wherein the block of phase correction includes a phase detector whose inputs are connected with outputs of the summators of signals of the main and squared oscillations while its output is connected to a first input of a controlled phase-turner, whose output, via a non-controlled phase-turner, is connected to an output of the summator of signals of the main oscillations, and an output of the controlled phase-turner is connected to a first input of the four-squared multiplier, and wherein the block of processing of information data is connected by irs inputs to outputs of amplifiers of signals of the adaptors.