Secondary vibration feedback control device for Coriolis mass flow meter

Abstract

The invention discloses a secondary vibration feedback control device for a Coriolis mass flow meter. The device comprises two coils, two columnar steel magnets and a Coriolis twisting control circuit, wherein the two coils and columnar steel magnets are arranged on the Coriolis mass flow meter; the Coriolis twisting control circuit is used for acquiring voltage signals from two velocity sensors;a current signal leading to a moment coil is generated through an input / output signal conditioning circuit, an A / D or D / A conversion circuit and a singlechip so as to enable the two coils to generatea magnetic field; and the two columnar steel magnets generates a moment opposite to a secondary vibration twisting moment of the Coriolis mass flow meter under the action of the magnetic field so as to counteract the secondary vibration twisting moment of the Coriolis mass flow meter. The device can acquire the magnitude of flow rate by detecting the amplitude of the control signal, greatly expand the range of the Coriolis mass flow meter and reduce the coupled vibration of the Coriolis mass flow meter.

Description

technical field [0001] The invention belongs to the technical field of mass flow measurement, and in particular relates to an auxiliary vibration feedback control device for a Coriolis mass flow meter. Background technique [0002] Coriolis Mass Flowmeter (CMF) is a direct mass flow measuring instrument working in a resonance state, which can accurately measure mass flow and fluid density at the same time, and is widely used in industrial fields. After more than 20 years of application and improvement, Coriolis mass flowmeters have developed several series, such as figure 1 As shown in the figure, (a) is a U-shaped tube, (b) is a single-double loop tube, (c) is an S-shaped tube, (d) is an OMG-shaped tube, (e) is a B-shaped tube, and (f) is a double-loop tube. Straight tube, see reference [1]: Ji Aimin, Li Chuanqi, Shen Lianguan, Yin Xiezhen. Coriolis mass flowmeter research status and development trend [J]. Instrument Technology and Sensors, 2001, (6): 1. [0003] The most...

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Problems solved by technology

[0005] However, due to the working principle of the Coriolis mass flowmeter 11, when the flow rate of the Coriolis mass flowmeter 11 is large, that is, the Coriolis torsion amplitude is large, the linear relationship between the output phase difference and the flow rate becomes weaker and weaker. , which restricts its measuring range; moreover, strong Coriolis torsional vibration will also produce structural coupling vibration, which will affect the measurement of Coriolis mass flowmeter 11 and reduce the service life of Coriolis mass flowmeter 11

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