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Electromagnetic flowmeter for non-full pipe flow measurement

An electromagnetic flowmeter and flow measurement technology, which is applied in the application of electromagnetic flowmeters to detect fluid flow, measure flow/mass flow, liquid/fluid solid measurement, etc., can solve problems such as flow pattern sensitivity

Active Publication Date: 2012-03-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned defects in the prior art, the problem to be solved by the present invention is to provide an electromagnetic flowmeter that can be used for the measurement of the flow in a part-filled pipe, which solves the problem that the existing electromagnetic flowmeter is sensitive to the flow pattern in the measuring pipe, and in the case of a non-full pipe. Different fluid media need to be calibrated under the full pipe flow state, etc.

Method used

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  • Electromagnetic flowmeter for non-full pipe flow measurement

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Embodiment Construction

[0014] The patent embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0015] attached figure 1 It is a structural schematic diagram of an electromagnetic flowmeter that can be used for the measurement of partial pipe flow. The electromagnetic flow sensor 1 includes a measuring tube 111, a plurality of electrodes 121 to 128, and excitation coils 131 and 132; the measuring tube is a circular tube structure, and its manufacturing material is an insulating material; the electrodes 121 to 128 are in the form of point electrodes, etc. The spacing is embedded on the inner wall of the same section of the measuring tube 1, wherein the connecting line of the electrode 121 and the electrode 125 is perpendicular to the connecting line of the coil center and parallel to the horizontal plane; On both sides of the coil, the center line of the coil passes through the center of the circle and is connected in series. ...

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Abstract

The invention relates to an electromagnetic flowmeter for non-full pipe flow measurement, comprising an electromagnetic flow transducer, an electrical impedance measurement module, an induced electromotive force measurement module and a control and signal processing module. The electromagnetic flowmeter is characterized in that the electromagnetic flow transducer comprises a measuring pipe, an electrode and a magnet exciting coil; the electrical impedance measurement module includes a multi-way switch group A, an excitation signal source circuit and an electrical impedance measurement circuit; the induced electromotive force measurement module comprises a multi-way switch group B, an exciting circuit and an induced electromotive force measurement circuit; and the control and signal processing module is in charge of controlling the multi-way switch group A and the multi-way switch group B, the electrical impedance measurement module is used for obtaining a plurality of groups of electrical impedance values, and the induced electromotive force measurement module is used for obtaining a plurality of groups of induced electromotive force values, so that the flow rate inside a pipe can be obtained under the conditions of full pipe and non-full pipe. The electromagnetic flowmeter can realize accurate measurement of the flow rate without calibrating different fluid mediums in a state of non-full pipe flow.

Description

technical field [0001] The invention relates to a flow measurement device, in particular to an electromagnetic flowmeter. Background technique [0002] At present, traditional electromagnetic flowmeters are generally sensitive to flow patterns, for example, the Chinese published patents of electromagnetic flowmeter CN1108385, electromagnetic flowmeter CN1131273, electromagnetic flowmeter and flow electromagnetic measurement method CN1097868, etc. The electromagnetic flow sensor is installed in the pipeline, and the conductive liquid flows through the electromagnetic flow sensor. The converter supplies the excitation current to the excitation coil to generate a magnetic field in the electromagnetic flow sensor, and the moving fluid cuts the magnetic field line measurement electrode to obtain the induced electromotive force. For the above structure, when any point of fluid micro-unit flows through a certain point in the measuring tube, the induced potential generated is not o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/58G01F1/60
Inventor 徐立军范士伟曹章
Owner BEIHANG UNIV
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