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Flux measuring method based on negative resistance property and resistance flowmeter

A negative resistance characteristic and flow measurement technology, applied in the direction of volume/mass flow generated by electromagnetic effects, can solve the problems that the dynamic instantaneous flow cannot meet the actual control requirements, the instantaneous dynamic flow cannot respond, and only the average flow can be measured. Achieve the effect of simple structure, large choice and simple method

Inactive Publication Date: 2006-09-06
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Most flowmeters need to install orifice plates, turbines, and throttling elements in the pipeline, resulting in large pressure loss, disturbing the flow field, and large measurement errors
(2) Slow dynamic response
Due to the inertia of moving parts, most of them can only measure the average flow, and cannot respond to the instantaneous dynamic flow
(3) The price is high
Especially in the field of fluid transmission and control, the response speed is getting faster and faster, and the requirements for the dynamic performance of the system are getting higher and higher. The current measurement level of dynamic instantaneous flow is far from meeting the actual control requirements. Become a problem that restricts the improvement of system control performance

Method used

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  • Flux measuring method based on negative resistance property and resistance flowmeter
  • Flux measuring method based on negative resistance property and resistance flowmeter
  • Flux measuring method based on negative resistance property and resistance flowmeter

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Embodiment Construction

[0041] Flow Measurement Method Based on Negative Resistance Characteristic and Resistance Flowmeter

[0042] 1. Flow measurement method based on negative resistance characteristics

[0043] In the flow field, measure the change of resistance between two fixed points of the liquid, find out the relationship V=f(R) between the resistance R of different liquids and the average flow velocity V through calibration, and process the information through the preamplifier converter and the flow totalizer. Get the flow information and display it on the display, the specific method is:

[0044] (1) Two electrodes are connected in series in the pipe to measure the flow rate, and the electrodes are in direct contact with the liquid. When the pipe is filled with liquid, a liquid resistance whose value changes with the average flow rate is formed between the two electrodes.

[0045] (2) To calibrate the flowmeter, first keep the liquid in the tube still, and measure the original liquid resista...

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Abstract

The disclosed measurement method comprises: measuring the resistance variation between two fixed points in flow field and opposite liquid average flow rate to scale and find out the relation V=f(R), then calculating the flow rate by Q=AV=Af(x). Wherein, the flowmeter comprises a flow rate sensor, a front-end amplification converter, a flow rate integrator, a display and record device, an interface circuit, and a power. This invention has well application in lots of fields.

Description

technical field [0001] The invention relates to a method and device for measuring flow by measuring the resistance between two fixed points of liquid in a flow field, especially a flow measurement method based on negative resistance characteristics and a resistance flowmeter designed by the method. Background technique [0002] Flowmeter is an instrument widely used in many fields such as petroleum, chemical industry, food, environmental protection, fluid transmission and control. In the petroleum and chemical industries, flow is often the main measurement and control parameter, and its detection accuracy has an important impact on product quality and production safety. In fluid transmission and control, the flow rate is the main parameter to monitor the working state of the system, evaluate the static and dynamic performance of the system components, and improve the accuracy and technical level of flow measurement, which has great theoretical significance and practical valu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/56
Inventor 杨尚平杨晓玉马骏骑陈斌
Owner KUNMING UNIV OF SCI & TECH
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