Electrode device of electromagnetic flow meter

Abstract

The invention discloses an electrode device of an electromagnetic flow meter. The electrode device of the electromagnetic flow meter comprises a measuring tube, a first electrode, a second electrode, a first lead, a second lead, a signal modulating circuit and a printed circuit board. The first electrode and the second electrode are respectively arranged on two sides of the inner wall of the measuring tube and a smooth surface is formed on the inner wall of the measuring tube. One ends of the first lead and the second lead are respectively connected with the first electrode and the second electrode, the other ends of the first lead and the second lead are connected with the signal modulating circuit, and the signal modulating circuit is arranged on the printed circuit board. The first electrode and the second electrode are made of electroconductive plastics and processed with an injection molding method. The measuring tube is made of insulation plastics and processed with the injection molding method. The electrode device of the electromagnetic flow meter is simple in manufacturing and assembling process and low in cost. The surface where electrodes contact with fluid is the smooth surface and on the same level with the inner wall of the measuring tube so that a measuring error caused by turbulent flow is reduced and higher measuring accuracy is obtained.

Description

technical field [0001] The invention relates to an electromagnetic flowmeter, in particular to an electrode device of the electromagnetic flowmeter. The invention is applicable to the field of flow measurement based on the principle of electromagnetic measurement, and is particularly suitable for household balance meters, balance heat meters, heat meters, cold meters, water meters, sewage meters, etc. based on the principle of electromagnetic measurement. Background technique [0002] Electromagnetic flowmeter is a flow measuring instrument based on Faraday's electromagnetic induction principle. Its basic principle is: when the fluid passes through the magnetic field, an induced electric potential is generated in the vertical direction of the magnetic field, and the magnitude of the induced electric potential is proportional to the flow velocity of the fluid. The flow rate of the fluid, and then the flow rate of the fluid is obtained. The electromagnetic flowmeter has a sec...

AI Technical Summary

Problems solved by technology

[0008]1. The method of arranging electrodes by opening holes in the measurement tube wall is complicated in process and high in cost, and is not suitable for mass production, especially for small-diameter electromagnetic flowmeters;

[0009]2. The surface in contact with the electrode and the fluid is not smooth with the inner wall of the measuring tube, which affects the measurement accuracy;

[0010]3. The leads are complicated and need to be installed separately, and generally need to be shielded;

[0011]4. Using metal electrodes and plastic measuring tubes, there is a gap between metal and plastic, which is easy to cause leakage

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