Capacitive electromagnetic flowmeter

An electromagnetic flowmeter, capacitive technology, applied in the application of electromagnetic flowmeter to detect fluid flow, volume/mass flow generated by electromagnetic effects, measurement flow/mass flow, etc., can solve the problem of high impedance and the sensitivity of the initial signal amplification circuit to noise Influence, electromagnetic flowmeter measurement accuracy and measurement stability decrease, etc., to achieve the effect of reducing costs and suppressing temperature drift

Active Publication Date: 2019-09-24
YAMATAKE HONEYWELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, capacitive electromagnetic flowmeters are constructed so that the fluid to be detected does not come into contact with the electrodes, so the impedance between the fluid to be detected and the electrodes becomes extremely high, and the initial signal amplification circuit becomes susceptible to noise
Therefore, when noise is superimposed on the wiring between the electrodes and the input terminal of the signal amplifier circuit, there is a problem that the measurement accuracy and measurement stability of the electromagnetic flowmeter deteriorate.

Method used

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no. 1 Embodiment approach

[0057] First, refer to figure 1 as well as figure 2 , the capacitance type electromagnetic flowmeter 100 according to the first embodiment of the present invention will be described. figure 1 It is a perspective view showing the detecting part of the capacitance type electromagnetic flowmeter of the first embodiment. figure 2 It is a block diagram showing the circuit configuration of the capacitance type electromagnetic flowmeter of the first embodiment.

[0058] [Capacitance Electromagnetic Flowmeter]

[0059] This capacitive electromagnetic flowmeter 100 has the following function: using the electrodes provided on the outer peripheral surface of the measuring tube, through the electrostatic capacitance between the fluid and the electrodes, the flow of the measuring object flowing in the measuring tube due to the magnetic flux applied by the exciting coil is performed. The electromotive force generated in the fluid is detected, and the resulting electromotive force is ...

no. 2 Embodiment approach

[0114] Next, refer to Figure 7 , a capacitance type electromagnetic flowmeter according to a second embodiment of the present invention will be described. Figure 7 It is a front view of the detection part of 2nd Embodiment.

[0115] In the first embodiment, as a method of mounting the preamplifier substrate 5 to the measuring tube 2, the outer peripheral surface 2A of the measuring tube 2 passing through the tube hole 5H and the end of the tube hole 5H are fixed with an adhesive. An example is described. In this embodiment, the case where the preamplifier board 5 is mounted by pressure welding the end of the tube hole 5H to the outer peripheral surface 2A of the measuring tube 2 will be described.

[0116] Such as Figure 7 As shown, the preamplifier substrate of the present embodiment may be provided with a convex portion 5T on the hole wall surface of the tube hole 5H, and the convex portion 5T is in contact with the outer peripheral surface 2A. As a result, the end of...

no. 3 Embodiment approach

[0120] Next, refer to Figure 8 ~ Figure 10 The detecting unit 20 of the capacitance type electromagnetic flowmeter 100 according to the third embodiment of the present invention will be described. Figure 8 It is a plan view of the detection unit of the third embodiment. Figure 9 It is a side view of the detection part of 3rd Embodiment. Figure 10 It is a front view of the detection part of 3rd Embodiment.

[0121] In the first embodiment, the case where the front electrodes 10A, 10B, the connection wirings 11A, 11B, and the preamplifier 5U are collectively shielded by one shield case 6 has been described as an example. In this embodiment, a case where the preamplifier 5U, the surface electrodes 10A, 10B, and the connection wirings 11A, 11B are individually shielded will be described.

[0122] That is, if Figure 8 ~ Figure 10 As shown, the detection unit 20 of this embodiment includes two shields 6A, 6B, the shielding case 6A shields the facing electrodes 10A, 10B and ...

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Abstract

The invention provides a capacitive electromagnetic flowmeter which suppresses the thermal influence from an excitation coil or a fluid and the influence of magnetic flux differential noise caused by a magnetic circuit without protecting an electrode and shielding a cable. A pre-amplifier substrate (5) on which a pre-amplifier (5U) for amplifying the electromotive force detected by surface electrodes (10A, 10B) is mounted is disposed in a direction intersecting a measurement tube (2) and at a position outside a magnetic flux region (F) in which magnetic flux (fai) is generated.

Description

technical field [0001] The present invention relates to a capacitive electromagnetic flowmeter for measuring the flow rate of a fluid without bringing an electrode for detecting an electromotive force generated in the fluid into contact with the fluid. Background technique [0002] The electromagnetic flowmeter is equipped with an excitation coil and a pair of electrodes, and detects the electromotive force generated between the electrodes while alternately switching the polarity of the excitation current flowing in the excitation coil to measure the flow of the fluid to be detected flowing in the measurement tube. A measuring instrument for measuring flow rate, the excitation coil generates a magnetic field in a direction perpendicular to the longitudinal direction of the fluid flowing in the measurement tube, the pair of electrodes are arranged in the measurement tube, and are arranged in contact with the magnetic field generated by the excitation coil in the orthogonal di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/58
CPCG01F1/58G01F1/588G01F1/584G01F1/60G01F1/586
Inventor 百濑修稻垣广行间间田浩一山崎吉夫山下匠
Owner YAMATAKE HONEYWELL CO LTD
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