Re-improved L-shaped pitot tube for measuring flow velocity of fluid

A technology of fluid flow rate and pitot tube, which is used in measurement devices, fluid velocity measurement, velocity/acceleration/shock measurement, etc., can solve problems such as unfavorable adjustment of pitot tube orientation, interference with static pressure measurement, etc., to reduce interference and expand Measurement range, the effect of expanding the applicable range

Inactive Publication Date: 2014-10-01
张益民
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The static pressure measurement hole of the Pitot tube is opened on the outer casing wall. When the flow rate is high, the fluid will form an umbrella flow field due to the large size of the measurement head, which may form turbulent flow in the static pr

Method used

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  • Re-improved L-shaped pitot tube for measuring flow velocity of fluid
  • Re-improved L-shaped pitot tube for measuring flow velocity of fluid
  • Re-improved L-shaped pitot tube for measuring flow velocity of fluid

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Embodiment Construction

[0063] The applicant has successfully produced 4 complete and improved L-shaped pitot tubes and several hemispherical total pressure measuring tubes with different diameters without static pressure holes, and made them with externally purchased pitot tubes with a diameter of 4mm. conducted a comparative test.

[0064] The specific dimensions of the self-made pitot tube are: the outer diameter of the small straight tube is 1.5mm (the minimum used in the test is 0.6mm), the extension length is 20mm; the cone angle of the conical tube is about 10 degrees; the diameter of the outer tube is 4.4mm and 4.8mm . Hemispherical total pressure measuring tubes without static pressure holes have diameters of 8mm, 6mm, 3mm and 2.6mm.

[0065] The azimuth indicating rod of the self-made pitot tube is installed on site, and the length is about 200mm. The field test conditions are as follows: the fan is 4-72-4A-2900rpm-5.5kW, the air volume is 4020-7420m3 / h, and the wind pressure is 1999-1313...

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Abstract

The invention discloses a re-improved L-shaped pitot tube for measuring flow velocity of fluid. According to the re-improved L-shaped pitot tube, the semispherical, semielliptical spherical or cone frustum-shaped section of the measuring head, which is used for measuring the total pressure, of the conventional L-shaped pitot tube is changed to be a section of small straight pipe, and a section of conical tube with a small taper angle or both a conical tube and an elliptic conical tube is/are connected between the small straight pipe and the small straight pipe of the pitot tube for transition. According to the invention, since the area of the measuring head is greatly reduced, and vortexes formed in front of the measuring opening can be reduced, so that the total pressure is measured more accurately, and higher flow velocity can be measured; since the measuring head becomes smaller, the conical tube with the small taper angle is adopted for transition, and fluid outside the tube is more stable, static pressure is measured more accurately; since the external diameter of the pitot tube is extremely small, and interference to the state of fluid in a measured tube is reduced, smaller air ducts can be measured, and the measurement range is enlarged.

Description

technical field [0001] The invention relates to a fluid flow rate measuring instrument, in particular to the further improvement of the L-shaped standard pitot tube. Background technique [0002] Now there are many kinds of instruments for measuring fluid velocity, such as: volumetric, differential pressure, rotor, ultrasonic, electromagnetic, Doppler, etc. Among them, there are many kinds of differential pressure flowmeters, such as pitot tube, orifice plate, Venturi, nozzle, etc.; It is said that there are more than 60 kinds of fluid flow meters. [0003] See the introduction of Pitot tube by Shanghai Jiaotong University, the specific website is: http: / / www.ie.sjtu.edu.cn / jc / files / pitot / introduction.htm. [0004] Among all kinds of fluid flowmeters, the L-type standard Pitot tube has a special important position, because it is the only one that is directly made according to the Bernoulli equation principle embodied in fluid mechanics by the world-recognized law of energy...

Claims

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Application Information

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IPC IPC(8): G01P5/165
Inventor 张益民张弛
Owner 张益民
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