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Flow rate sensor

A velocity sensor and velocity sensor technology, applied in fluid velocity measurement, instrument, velocity/acceleration/impact measurement, etc., can solve problems such as trade settlement troubles, large error in open channel flow measurement results, etc., to solve large measurement errors and improve measurement The effect of precision

Active Publication Date: 2018-03-30
HUNAN INST OF METROLOGY & TEST
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  • Application Information

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Problems solved by technology

Therefore, the error of open channel flow measurement results is often large, which brings troubles to trade settlement

Method used

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Embodiment Construction

[0012] Such as figure 1 , the speed sensor is fixed at point O, the force measuring device is installed at point A, and the effective part of the speed sensor is the range of the curve in the above figure. Neglecting the influence of gravity and buoyancy, the velocity sensor is affected by the impulse F of the fluid c and the elastic force F of the force measuring device, the two moments are balanced:

[0013] f c ×L=F×AO

[0014] In the formula, L is the average force arm of the part of the velocity sensor immersed in the fluid.

[0015] In order to facilitate the analysis of the impact torque of the fluid on the speed sensor, take any point B(x, y) on the curve, as shown in the figure, when Δy is small enough, BCDE is similar to a rectangle with an area of ​​xΔy; when x is much smaller than the measured channel When the width or diameter of the pipe is used, the fluid impact force on the rectangular BCDE is proportional to the product of its area and fluid velocity v, an...

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Abstract

The invention discloses a flow rate sensor comprising a body. The body comprises an upper part and a lower part connected to the upper part. A speed measurement sensor and a force measurement device are installed at the upper part. A cross section of the upper part is a triangle. A cross section of the lower part comprises two areas, one area is a triangular shape, and the other area comprises twofold lines. One end of each of the two fold lines is connected to an apex of the triangular shape, the other end of each of the two fold lines is connected to a horizontal line, a third apex of the triangular shape and an apex of the triangle of the upper part are in a same straight line which is parallel to a center line of the body. The side lengths of two sides of triangular shapes in cross sections from top to bottom of the lower part gradually decrease, thus two curves symmetrical about the straight line are formed at two sides of the lower part. The invention also provides a sensor which measures a channel flow in a field, a problem of a large measurement error of an existing measurement device can be solved, and the measurement accuracy is improved.

Description

technical field [0001] The invention relates to a flow velocity sensor. Background technique [0002] The target flowmeter first appeared in the 1960s. It is a flowmeter based on the principle of mechanics. It was originally mainly used to solve the flow measurement problem of high viscosity and low Reynolds number fluid. Our country began to develop this kind of instrument in the 1970s. In recent years, target flowmeters using new strain gauge force sensors and microelectronic technology have made great progress in measurement accuracy, anti-interference, sealing reliability, calibration and debugging, etc. It has both orifice plates, vortex streets, etc. The flowmeter has the characteristics of no moving parts, but at the same time has high sensitivity, accuracy comparable to that of the volumetric flowmeter, and a wide range of measurement range, which has become a common device for flow measurement. The working of the target flowmeter requires that the fluid must fill ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/02
CPCG01P5/02
Inventor 向德华李宁朱宁周艳
Owner HUNAN INST OF METROLOGY & TEST
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