A permanent magnet liquid metal flowmeter
A liquid metal and flowmeter technology, applied in the field of flowmeters, can solve the problems that the measurement linearity cannot meet the demand, the online calibration of the flowmeter is not considered, and the temperature change range is wide, so as to increase the uniform area range, improve the output linearity, Solve the effect of inconvenient disassembly
Active Publication Date: 2018-10-09
CHINA INSTITUTE OF ATOMIC ENERGY
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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.
Method used
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Experimental program
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Embodiment 1
[0051] A permanent magnet liquid metal flowmeter, the flowmeter includes a primary sensor, a secondary instrument and a flow measuring device of a related method;
[0052] The primary sensor includes a magnetic system measuring part, a temperature measuring part, a supporting positioning assembly and a protective part, wherein the protective part is located outside the magnetic system measuring part and is a bell-shaped structure for the protection of the flowmeter; the upper part of the protective part is also There is a magnetic flux measurement blind tube, which is used as a magnetic flux density measurement interface for placing the Tesla meter; during regular calibration, extend the Tesla meter to the bottom of the dead tube to ensure the measurement position of the Tesla meter probe at different times After the magnetic flux density measurement of the magnetic steel assembly is completed, the change in the graduation characteristic of the flowmeter caused by the change of t...
Embodiment 2
[0059] Different from Embodiment 1, there is an air gap between the magnetic pole 4 and the pipe assembly 1, and the width of the gap is 6mm.
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The invention belongs to the technical field of flow meters and discloses a permanent magnet liquid metal flow meter. The flowmeter includes a primary sensor, a secondary instrument and a flow measurement device of the related method; the primary sensor includes a magnetic system measurement component, a temperature measurement component, a support positioning component and a protective component, wherein the magnetic system measurement component is the core of the primary sensor, and It is composed of multiple magnetic steel components connected in series, and the multiple magnetic steel components are connected by a pair of magnetic poles to form a closed magnetic circuit, which provides a stable magnetic field for the permanent magnet pipeline liquid metal flowmeter; the magnetic system measurement components also include electrodes and pipeline components; pipeline The component axis, electrode axis, and magnetic field lines are perpendicular to each other; the flowmeter adopts a series split structure, which can realize the advantages of online calibration, good measurement linearity and small measurement error, and is suitable for large range (>300m3 / h).
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...
Claims
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IPC IPC(8): G01F1/58G01F25/00
CPCG01F1/58G01F25/10
Inventor 吴宏岩董康乐杨建伟金佳佳吕鹏杨洋崔国生赵保平
Owner CHINA INSTITUTE OF ATOMIC ENERGY