Permanent-magnetic liquid metal flowmeter

Abstract

The invention belongs to the technical field of flowmeters and discloses a permanent-magnetic liquid metal flowmeter which comprises a primary sensor, a secondary instrument and a correlation method flow measuring device. The primary sensor comprises a magnetic system measuring part, a temperature measuring part, a supporting and positioning component and a protecting part, the magnetic system measuring part is the core of the primary sensor and is formed by serially connecting multiple magnetic steel components which are connected by a pair of magnetic poles to form a closed magnetic circuit which provides a stable magnetic field to the permanent-magnetic liquid metal flowmeter, the magnetic system measuring part further comprises electrodes and a pipeline component, and axis of the pipeline component, axes of the electrodes and a magnetic line are perpendicular to one another. The permanent-magnetic liquid metal flowmeter is of a tandem split structure, and has the advantages of being supportive of online calibration, high in measuring linearity, few in measuring error and suitable for wide measuring range.

Description

technical field [0001] The invention belongs to the technical field of flowmeters, in particular to a permanent magnet liquid metal flowmeter. Background technique [0002] Due to the high temperature of liquid metal, its active chemical properties and most of its application areas are in high-irradiation environments, conventional flowmeters cannot be used in the field of liquid metal flow measurement. The permanent magnet pipeline liquid metal flowmeter is based on the principle of Faraday's law of electromagnetic induction, that is, when liquid metal flows in a pipeline perpendicular to the magnetic field, it cuts the magnetic force line, and induces an electromotive force on two electrodes perpendicular to the direction of liquid metal movement and the direction of the magnetic force line. The magnitude of this induced electromotive force is proportional to the fluid flow rate, so the liquid metal flow rate can be obtained by detecting the induced electromotive force out...

AI Technical Summary

Problems solved by technology

However, the application fields of liquid metals (such as sodium in sodium-cooled fast reactors) generally have the characteristics of high temperature and wide temperature range (such as the temperature range of sodium in fast reactors is 150°C to 600°C). The measurement linearity at one temperature cannot fully meet the actual measurement requirements

[0004] The currently published Chinese patents (application numbers 200910116768.4 and 201210556276.9) are all liquid metal flowmeters using the permanent magnet principle. Pipeline liquid metal flow measurement will have the problem that the measurement linearity cannot meet the demand

[0005] In addition, traditional liquid metal flowmeters are generally installed by welding based on safety considerations after installation, and do not need to be disassembled for calibration, and the current public liquid metal flowmeters are not designed to realize online calibration of the flowmeter.

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