Concave arc-shaped double-flow-direction uniform-speed pipe flow meter
A uniform velocity tube flowmeter, concave arc technology, applied in the direction of measuring fluid flow by measuring pressure difference, volume/mass flow generated by mechanical effect, etc., can solve problems affecting measurement effect, achieve low economic cost, reduce measurement Good cost and linearity
Pending Publication Date: 2019-03-08
TIANJIN TJ UNI TAIHE AUTOMATION CONTROL & INSTR CO LTD
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Problems solved by technology
The location of the static pressure point makes the output differential pressure much lower than other types of uniform velocity tubes, which affects its measurement effect under low density and low flow rate conditions
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[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0031] Such as figure 2 , image 3 As shown, the concave arc-shaped double-flow uniform velocity tube flowmeter of the present invention is a differential pressure device composed of a detection rod 2, a total pressure tube 3, a static pressure tube 4, a total pressure hole 5 and a static pressure hole 6. The concave arc double-flow constant velocity tube flowmeter is a hollow metal rod that is inserted into the measuring pipe along the diameter, that is, the detection rod 2. There are pairs of total pressure holes 5 in the upstream direction to measure the total pressure. All the total pressure holes 5 It is connected with the total pressure pipe 3, and the average total pressure p is drawn from the upper part of the total pressure pipe 3 1 . There are pairs of static pressure holes 6 for measuring static pressure on the back surface of the detec...
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The invention relates to a concave arc-shaped double-flow-direction uniform-speed pipe flow meter which comprises a detection rod inserted into a measuring pipeline along the diameter, a total pressure pipe and a static pressure pipe, wherein the total pressure pipe and the static pressure pipe are arranged in the detection rod, the total pressure pipe is positioned on an incident flow surface, the static pressure pipe is positioned on a back flow surface, a total pressure hole and a static pressure hole are arranged on the incident flow surface and the back flow surface of the detection rod,all the total pressure holes are communicated with the total pressure pipe, and the average total pressure p is led out from the total pressure pipe; all the static pressure holes are communicated with the static pressure pipe, and static pressure p is led out from the static pressure pipe; the difference between the measured total pressure p and the measured static pressure p is utilized to obtain the average flow speed on the cross section of the pipeline. The concave arc-shaped double-flow-direction uniform-speed pipe flow meter is characterized in that the cross section shape of the detection rod is similar to a rhombus, the four sides of the detection rod are concave arc-shaped, the incident flow surface and the back flow surface are convex arc-shaped, and the connection parts of thesides of the concave arc-shaped surfaces are streamline. The concave arc-shaped double-flow-direction uniform-speed pipe flow meter can effectively improve the output differential pressure of the uniform-speed pipe flow meter and improve the precision of low-flow measurement of the uniform-speed pipe.
Description
technical field [0001] The present invention relates to averaging tube flowmeters. Background technique [0002] As one of the plug-in flow meters, the uniform velocity tube flowmeter (called Annubar, Verabar, Probar, etc. abroad) is a differential pressure flowmeter developed based on the principle of pitot tube speed measurement in the late 1960s. Compared with traditional flow sensors, averaging tube flowmeters are widely used in the flow measurement of large-diameter pipelines in industries such as electric power, metallurgy, and petrochemical industries because of their simple structure, convenient installation and disassembly, small pressure loss, and low cost. It has the following advantages: [0003] (1) Wide range of applications. The average velocity tube flowmeter can be used for flow measurement of all fluids without solid particles; the applicable pipe diameter range is wide, the minimum diameter can reach 25mm, and the maximum diameter can reach 9m; it can me...
Claims
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IPC IPC(8): G01F1/36
CPCG01F1/36
Inventor 张涛张景丽陈增辉
Owner TIANJIN TJ UNI TAIHE AUTOMATION CONTROL & INSTR CO LTD