Wedge shape pore plate flow measurement device with whole tungsten carbide material

Abstract

The invention provides a wedge shape pore plate flow measurement device with whole tungsten carbide material which is composed of a measurement pipe, a pressure tapping subassembly and a wedge shape pore plate. The wedge shape pore plate uses tungsten carbide material whole sintering and grinding for forming; the measurement pipe wall is coated with tungsten carbide layer, and a wedge port fittedwith the wedge pore plate is opened on the measurement pipe, the wedge shape pore plate is tight pressed in the wedge port through a pressing device. The device has advantages and active effects as follows: 1. the whole tungsten carbide plate uses the tungsten carbide material whole sintering and grinding for forming which can ensure accurate and consistency of geometric molded line ensures measurement accuracy and increases working life. 2. a structure of the tungsten carbide wedge shape plate fixing with the measurement pipe can ensure measurement reliability in high pressure and high flow speed. 3. the product has better consistency which is replaceable and is convenient for realizing standard mass production.

Description

Technical field: [0001] The invention belongs to a throttling device, in particular to a flow measuring device for a wedge-shaped orifice plate made of integral tungsten carbide. Background technique: [0002] The wedge-shaped orifice flow measuring device (hereinafter referred to as the wedge-shaped device) is a new type of throttling device that has been used since the 1980s. It has the same function as the standard orifice plate as the throttling element. The specific relationship between the pressure difference generated before and after the throttling element and the flow rate is measured by combining with a differential pressure transmitter. The wedge-shaped device consists of a measuring tube, a pressure-taking component and a wedge-shaped orifice plate. Among them: the shape of the wedge-shaped orifice plate of the measuring element is a wedge-shaped block with a triangular cross-section and a smooth top angle facing downward, so that the liquid or viscous liquid co...

AI Technical Summary

Problems solved by technology

[0007] ②Due to the undeterminable factors of welding deformation, the irregular geometric shape of the wedge, the poor consistency, and the difficulty of correcting the welding bead of the welded part of the wedge (baffle) and the measuring tube after welding, resulting in no matter during calibration or in use The outflow coefficient is unstable, and the measurement accuracy can only reach 2.0%-4.0% or even lower, which cannot be used for flow measurement with higher precision requirements

[0008] ③Unable to spray cemented carbide (tungsten carbide)

[0011] ①Due to the limitations of the spraying process and the result of subsequent processing, the coating thickness is only 0.1-0.3mm. In some cases, the coating has fallen off during use due to the processing defects of the wedge block before spraying.

In this way, even if the high wear-resistant material "tungsten carbide" is selected, it is still difficult to ensure that the coating will not be abraded under the long-term erosion of the fluid, and the accuracy of flow measurement and the service life of the device cannot be guaranteed.

[0012] ②The fixing structure between the wedge block and the measuring tube has poor reliability, and the wedge block is easy to loosen or even fall off

The bolt diameter and screw-in length of the fixed wedge block are limited to a small value by the angle of the wedge block. When in use, the bolt will bear the shear force and the plastic deformation of the bolt itself in the pipeline for a long time (the weight of the wedge block and the pressure from the fluid) Impulse) increases the gap between the wedge block and the pipe wall and can no longer be tightened

When the piping system vibrates or is improperly operated, the bolts are likely to break, causing the wedge to fall off and making it impossible to measure, what's more, the wedge is crushed and damages downstream equipment

[0013] ③The fixed structure makes the assembly process poor, and it is impossible to control and inspect the shape and position error of the assembly of the wedge block and the measuring tube. , the outflow coefficient of the wedge flowmeter must be calibrated one by one, the products are not interchangeable, and standardization cannot be achieved

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