Flow meter of perforated plate

Abstract

The invention provides a flow meter of a perforated plate, which comprises the perforated plate and the flow meter. A substrate of the perforated plate is in a circular shape. The perforation rate f the perforated plate ranges from 10% to 60%. The substrate has three categories with uneven hole structures. A large circular hole is arranged at the centre position of a preferential substrate, a plurality of small circular holes are evenly distributed on the other positions of the substrate, the small circular holes arranged on the outmost periphery intersect with the periphery of the substrate to form non-complete circular holes. The diameter of the large circular hole is two to ten times of the diameter of the small circular holes. The flower meter can be chosen from three categories: 1 a direct-reading type pipe chute differential-pressure flow meter, 2 an indirect reading flow meter connected with a secondary meter through a differential-pressure sensor and 3 an indirect reading flowmeter connected with a secondary meter through a differential-pressure switch and a differential-pressure sensor. The flow meter is small in volume, convenient to install, high in measurement accuracy, small in flow resistance of fluid, less in liquid accumulation in a pipeline and especially suitable for measuring flow of vapor, combustible fluid, explosive fluid, corruptible fluid and dirty fluid.

Description

Technical field [0001] The invention relates to a device for measuring the flow of fluid in a pipeline, especially a flow meter composed of a porous plate. Background technique [0002] The flow measurement of the fluid in the pipeline laid in the fluid engineering requires the use of a flowmeter, usually a float flowmeter, an orifice (single orifice) flowmeter, and a venturi flowmeter. These flow rates have the disadvantages of high meter price, large volume, large resistance to fluid, low measurement accuracy or inconvenient installation. Especially when online monitoring of the flow of many pipelines is required, the limited space on site often makes it impossible to install and use existing flow meters. [0003] The patent specification with the patent number 200910176227.0 discloses a "flow meter and flow control device". The flow meter includes a first perforated plate. The first perforated plate is arranged on the first curved part of the flow path and is opposite to the fi...

AI Technical Summary

Problems solved by technology

The purpose of the curved part of the flowmeter is to reduce the liquid effusion in the pipeline, which is more beneficial than the single-orifice flowmeter installed on the straight pipeline, but the structure of the device is too complicated, which will easily lead to a drop in pipeline pressure and a decrease in flow efficiency

[0004] Ordinary perforated plates have many uniformly distributed small holes with the same diameter on one plate. While improving the shortcomings of single-orifice plates with high resistance, there are still other problems: fluid fluctuations in high-pressure areas, flow fields in low-pressure areas disorder, which leads to signal fluctuations and greatly affects the stability of the measurement; the perforated plate has many holes on one plate, although the height of fluid circulation can be reduced as much as possible, but it is impossible to open holes on the surrounding edges, and the fluid cannot pass through completely Porous orifice plate (single orifice plate also has this shortcoming), causes fluid to remain and accumulate in the pipeline, which brings great inconvenience to maintenance and replacement of parts on the pipeline, which inevitably limits its use on various fluid media, especially It is a flammable, explosive, toxic, corrosive, dirty fluid medium

However, porous plates with non-uniform open-pore structures are not provided in these publications

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