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Air flow measurement device

A flow measurement device and air duct technology, which is applied in the direction of detecting fluid flow by measuring pressure difference, volume/mass flow generated by mechanical effects, etc., can solve problems such as not being able to meet the requirements of automatic control, so as to save verification costs and improve flow capacity , good repeatability and long-term stability

Pending Publication Date: 2017-03-22
太原市普瑞兴生仪表有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many manufacturers promise to achieve 0.6D in the front and 0.2D in the rear, but in the actual use process, many investigations found that it can only be used for monitoring purposes, and cannot meet the use of automatic control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] figure 1 It is the front view of the air duct flow measuring device of Embodiment 1 of the present invention; figure 2 yes figure 1 left view of .

[0039] The meanings of the newly appearing reference signs in the figure are as follows: 1. Mounting flange; 2. Pipe wall; 3. Orifice plate; 4. Main hole.

[0040] An air duct flow measurement device, including a pipe wall, the two ends of the pipe wall are respectively fixedly connected with the installation flange, the installation flange is used to cooperate with the flange of the pipe, the measuring device is installed in the pipeline, and the pipe wall An orifice plate is fixedly installed, the orifice plate is perpendicular to the axial direction of the pipe wall, the center of the orifice plate is perpendicular to the axis of the pipe wall, and a main hole is arranged at the center of the orifice plate, and the main hole is circular.

[0041] The ingenious design of the rectified porous flowmeter lies in the comb...

Embodiment 2

[0047] image 3It is a left side view of the air duct flow measuring device according to Embodiment 2 of the present invention. In the figure, the same reference numerals as those used in the above-mentioned embodiments still follow the definition of the reference numerals in the above-mentioned embodiments. The meanings represented by the newly appearing reference signs in the figure are as follows: 5, satellite holes.

[0048] The difference between this embodiment and embodiment 1 is:

[0049] The outer side of the main hole is also provided with satellite holes, and the satellite holes are evenly distributed along the outer side of the main hole.

[0050] By arranging the satellite holes, the flow area of ​​the fluid can be increased, the flow capacity can be improved, and the loss caused by the measuring device to the pressure can be reduced. The permanent pressure loss of the porous orifice plate can be reduced to 1 / 2 of that of the single-hole orifice plate, which gr...

Embodiment 3

[0062] Figure 4 is a cross-sectional view of the air duct flow measuring device of Embodiment 3 of the present invention; Figure 5 yes Figure 4 left view of . In the figure, the same reference numerals as those used in the above-mentioned embodiments still follow the definition of the reference numerals in the above-mentioned embodiments. The implication represented by the newly appearing reference numeral among the figure is as follows: 6, fairing cover.

[0063] The difference between this embodiment and embodiment 2 is:

[0064] The orifice plate is provided with a shroud in the area between the main hole and two adjacent satellite holes, and the shroud is hemispherical.

[0065] When the air flow enters the measuring device from the left side in the figure, and encounters the hemispherical shroud, it can be guided by the shroud first, and smoothly flows into the satellite hole 5 and the main hole 4, avoiding direct impact on the holes The vortex and turbulence form...

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Abstract

The invention relates to an air flow measurement device. The air flow measurement device comprises a tube wall and an orifice plate, wherein the orifice plate is arranged on the tube wall in a fixing mode, the orifice plate is perpendicular to the axis direction of the tube wall, and the center of the orifice plate is perpendicular to the axis of the tube wall and is provided a circular-type main orifice, a plurality of satellite orifices are formed and uniformly distributed on the outer edges of the main orifice. The air flow measurement device makes an air fluid formed an ideal fluid in the measurement, and improves the measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement in an air duct, in particular to an air duct flow measurement device. Background technique [0002] The output of the power plant boiler double-inlet and double-outlet steel ball coal mill is to control the amount of fuel entering the boiler by controlling the primary air volume entering the coal mill. Therefore, the accuracy and precision of the primary air volume measurement signal are more stringent, and large The accurate measurement of the flow rate of the aperture air duct is one of the unsolved problems for domestic power plant boilers. [0003] Since the design footprint of domestic power plant boilers is a very important indicator, almost all power plant boiler air duct designs do not fully consider the requirements of air flow measurement for straight pipe sections. Due to the large cross-section of the pipeline, short straight pipe section, low flow velocity and large dust co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/36
CPCG01F1/36G01F1/42
Inventor 杨丰云
Owner 太原市普瑞兴生仪表有限公司
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