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Flow detecting device

A flow detection device and detection device technology, applied in the application of thermal effects to detect fluid flow, etc., can solve problems such as failing to meet the requirements of microfluidic detection

Inactive Publication Date: 2009-05-27
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing flowmeters have the above defects and fail to meet the requirements of microfluidic testing in medicine and life sciences

Method used

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Such as figure 1 As shown, the tube body G of the device of the present invention adopts a thin tube made of thermally poor conductor material-plexiglass or ceramic material. The inner diameter of the thin tube is less than 10mm (such as 7mm in diameter), and the outer diameter is 15mm. The electromagnetic induction heating stainless steel cylinder L2 is a thin-walled cylinder made of thin stainless steel, with a length of 80mm and the same inner diameter as the plexiglass tube G (such as 7mm). The wall thickness of the heating stainless steel cylinder L2 is less than 0.5mm (such as 0.3mm). Concentrically embedded in the plexiglass tube G. The electromagnetic induction coil L1 is wound with fine enameled wire. The design of the heating power should ensure that the temperature of the liquid can reach a temperature rise of no less than...

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Abstract

The present invention relates to flow detecting method and device, and is especially flow detecting method and device for fine pipeline in industrial, medical and biochemical instrument. The detecting method includes acquiring two temperature values T1 and T2 of fluid in constant section pipe with two infrared probes S1 and S2 spaced by certain interval, performing cross correlation calculation on T1 and T2 to find out time deviation corresponding to the maximum cross correlation value or the time for the fluid to flow through two infrared probes, dividing the interval by the time and multiplying the flow rate and the cross section area of the pipeline to obtain the flow rate value. The detecting device includes a pipe, an electromagnetic induction coil, an electromagnetic induction heating stainless steel tube, two infrared probes, a heating power driver and a micro computer unit. The present invention may be used for measurement of micro flow rate.

Description

technical field [0001] The invention relates to a flow detection device, in particular to a thin pipe flow detection device in industrial, medical and biochemical instruments. Background technique [0002] In the traditional industry, the structure of the flow detector is complicated, and the measured flow is generally a large flow, and the mechanical principle of the fluid is mostly used. In terms of micro-flow detection, the thermal detection method has great flexibility and advantages. Traditionally, the flow is detected by detecting the temperature. The main methods are: [0003] 1. Use a heating resistance element and a thermistor element to detect temperature. The temperature rise of the liquid is inversely proportional to the flow rate. Large flow, low liquid temperature, small flow, high liquid temperature. Because the heat conduction of the pipeline will consume part of the heat, and the heat capacity of liquids with different concentrations is different, this me...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/68
Inventor 郭少朋吴岚军李建国刘鸿霍荣岭王珺闫献勇
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI