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Differential pressure linear flow meter

A flowmeter and linear technology, applied in the field of differential pressure linear flowmeter, can solve the problems of easy blockage, large flow resistance, large volume, etc., and achieve the effect of eliminating easy blockage, wide measurement range and high measurement accuracy

Inactive Publication Date: 2016-08-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the laminar flowmeter in the prior art, such as large volume, large flow resistance and easy blockage, the present invention proposes a differential pressure linear flowmeter

Method used

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Embodiment Construction

[0038] This embodiment is a differential pressure linear flow meter for measuring air volume flow in an air duct.

[0039] This embodiment includes a main pipe 3 , a tube bundle rectifier 2 , a zoom nozzle 4 , a bypass inlet pipe 6 , a bypass pipe 7 , a bypass outlet pipe 13 , a pressure introduction pipe 11 and a laminar flow element 15 . Wherein: the main pipe 3 is connected with the external flow pipeline to be measured through the flange 1 positioned at the two ends of the main pipe, and the pipe length, inner diameter and outer diameter of the main pipe 3 are respectively 300mm, 60mm and 70mm; There are two through holes on the wall, namely the bypass inlet flow pipe hole 5 and the bypass outlet flow pipe hole 14 respectively. The two ends of the bypass pipe 7 communicate with the outlet of the bypass inlet pipe 6 and the inlet of the bypass outlet pipe 13 respectively. The diameters are the same, respectively 10mm and 16mm; the inlet of the bypass inlet pipe 6 and the o...

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Abstract

The invention provides a differential pressure linear flow meter. A main pipe is connected with an external pipeline to be subjected to flow detection; a pipe bundle type rectifier is arranged in a fluid inlet end of the main pipe; a convergence-divergence spraying pipe is fixed in the main pipe at the downstream of the pipe bundle type rectifier; a laminar flow element is arranged in a bypass pipe, and the laminar flow element is located between the two flow guide holes of a pressure guide pipe; a differential pressure meter is mounted in the middle of the pressure guide pipe; an inlet temperature pressure meter and an outlet temperature pressure meter are mounted on the bypass pipe. According to the differential pressure linear flow meter, the laminar flow element is arranged in the parallel bypass pipe and an anti-blocking filter screen is arranged at an inlet of the parallel bypass pipe; and flowing is accelerated through the convergence-divergence spraying pipe, impurities in fluid are brought away forcedly, and the surface of the filter screen is washed. With the adoption of the differential pressure linear flow meter, the technical disadvantages of a laminar-flow flow meter of large size, large flowing resistance and suitableness of measuring small flow are eliminated, and the practical reliability and the durability are improved; and the differential pressure linear flow meter has the characteristics of high measurement precision, very wide measurement range and linear association between flow and differential pressure.

Description

technical field [0001] The invention relates to the field of flow measurement, in particular to a differential pressure linear flowmeter. Background technique [0002] A flow meter is an instrument that measures flow. There are many types of flowmeters, among which differential pressure flowmeter is a widely used and traditional type of flowmeter, which obtains the flow rate of the pipeline to be measured by measuring the differential pressure at both ends of the flow measuring element, such as orifice flowmeter, Venturi flowmeter , Nozzle flowmeter, elbow flowmeter, wedge flowmeter, V cone flowmeter, etc. The advantages of the differential pressure flowmeter are stable measurement and high pressure and high temperature resistance, but the disadvantages are the large pressure loss of the fluid, the low measurement accuracy, and the small flow measurement range, which is only 4-8 times. It has been found that: when the fluid flowing through the measuring element is in a lam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/36G01F15/12
CPCG01F1/36G01F15/125
Inventor 李世武
Owner NORTHWESTERN POLYTECHNICAL UNIV
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