Multi-electrode insertion type electromagnetic flowmeter sensor

An electromagnetic flowmeter, plug-in technology, applied in the application of electromagnetic flowmeters to detect fluid flow, volume/mass flow generated by electromagnetic effects, etc., can solve the problems of instrument installation and performance-price ratio that are difficult to meet the application, and overcome measurement errors , the effect of improving the accuracy

Inactive Publication Date: 2009-02-18
SHANGHAI UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

However, in large-diameter pipelines, the long insulating measuring rod makes the installation

Method used

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  • Multi-electrode insertion type electromagnetic flowmeter sensor
  • Multi-electrode insertion type electromagnetic flowmeter sensor
  • Multi-electrode insertion type electromagnetic flowmeter sensor

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Embodiment Construction

[0018] A basic embodiment of the present invention is as follows: see figure 1 .

[0019] A multi-electrode insertion electromagnetic flowmeter sensor, including an insulated measuring rod 1 inserted in a fluid with an average flow rate V, and a helical coil 2 inside the insulated measuring rod 1, a magnetic field B is generated in the helical coil 2 under an excitation current I, and the insulated There is a pair of bottom electrodes 3 and 4 at the bottom of the measuring rod 1. The straight line formed by the two points of the bottom electrodes 3 and 4 forms a mutual cutting relationship with the average flow velocity V and the magnetic field B. There is an induced potential E1 on the bottom electrodes 3 and 4 =K1*V1*B, V1 is the fluid velocity at the bottom electrode 3,4 place, K1 is a coefficient; It is characterized in that a pair of side electrodes 5, 5 are arranged on a side magnetic surface of the insulating measuring rod 1 6. The side magnetic surface is the place wh...

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Abstract

The invention relates to a multi-electrode plug-in electromagnetic flowmeter sensor, comprising an insulation measuring rod inserted in the fluid with an average flow velocity V; a spiral coil is arranged in the insulation measuring rod; a magnetic field B is generated in the spiral coil under the excitation current I; a pair of bottom electrodes are arranged at the bottom of the insulation measuring rod; the straight line formed by the two points of the bottom electrodes, the average flow velocity V and the magnetic field B are mutually cut; a pair of lateral electrodes are arranged on one lateral magnetic surface of the insulation measuring rod; the lateral magnetic surface is the place where the magnetic field B of the spiral coil and the average flow velocity V form orthogonal cutting on the lateral side of the insulation measuring rod; at the same time, the straight line formed by the two points of the lateral electrodes, the average flow velocity V and the magnetic field B of the spiral coil are mutually cut. The sensor makes use of the lateral magnetic filed of the spiral coil on the lateral side of the insulation measuring rod to arrange new lateral electrodes on the lateral side of the insulation measuring rod, so that the lateral electrodes can form an electromagnetic flow measuring relation to the new flow velocity points under the lateral magnetic field of the spiral coil; therefore, the traditional bottom electrodes and the new lateral electrodes form the plug-in electromagnetic flowmeter sensor which can measure multi-point velocity. The invention overcomes the measurement error caused by velocity distribution and flow state changes and fundamentally improves the accuracy of plug-in electromagnetic flowmeters.

Description

technical field [0001] The invention relates to a multi-electrode insertion electromagnetic flowmeter sensor. technical background [0002] Plug-in electromagnetic flowmeter sensor is a kind of electromagnetic flowmeter sensor, which is widely used in the flow measurement of conductive fluid in large-diameter pipelines. The principle of the electromagnetic flowmeter sensor is to organize the entire measurement pipeline into a Faraday electromagnetic induction system, and obtain the induced potential that reflects the average flow velocity of the entire pipeline through the measurement electrodes. The Faraday electromagnetic induction system of the insertion magnetic flowmeter sensor is based on an insulated measuring rod that can be inserted into the fluid pipeline. Generally, the induced potential of the reaction fluid flow rate is obtained by measuring electrodes on the bottom end of the insulating measuring rod. That is, the induced potential corresponds to the fluid fl...

Claims

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Application Information

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IPC IPC(8): G01F1/58
Inventor 李斌陈坚祯沈丹平江一舟戴光瑜
Owner SHANGHAI UNIV
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