Built-in conical throttling gear

Abstract

The invention relates to a flux meter, especially a inner concealing cone throttling set that includes a sensor device, and flow guiding cone, front pressure collecting pipe, front pressure measuring pipe, front pressure measuring head. It has low request to the straight pipe section and could measure wide dynamic range high accuracy flow and is suitable to kinds of liquid.

Description

technical field [0001] The invention relates to a flow meter, in particular to a built-in cone throttling device capable of measuring the flow of various liquids and gases. Background technique [0002] The existing differential pressure flowmeters at home and abroad include GB / T2624-93 traditional orifice plates, nozzles, Venturi tubes and imported plug-in Verabar flowmeters. There are no experimental data and related calculation formulas above DN1200, and there are as follows Some Problems: [0003] 1) The obsoleteness of ISO 5167 test data: Most of the data used in ISO 5167 are the test results of the 1930s. Today, regardless of the throttling device manufacturing technology, flow test equipment and experimental technology, there has been great progress. Obtaining higher precision and more reliable data is necessary. In the 1980s, both the United States and Europe conducted large-scale tests, laying the foundation for the revision of ISO 5167. [0004] 2) Questions abo...

AI Technical Summary

Problems solved by technology

[0004] 2) Questions about the length of straight pipe sections in ISO 5167: When ISO voted to pass ISO5167, the United States voted against it. The main reason was that there were different opinions on the length of straight pipe sections. This issue should be one of the main issues in the revision of ISO 5167 one

[0005] 3) Scientific issues in the provisions of ISO 5167: There are many factors affecting the outflow coefficient of the throttling device, mainly including the ratio β of the aperture to the pipe diameter, the pressure taking device, the Reynolds number, the eccentricity of the throttling device installation, the front and rear resistance The type of flow parts and the length of the straight pipe section, the sharpness of the inlet edge of the orifice plate, the roughness of the pipe wall, the turbulence of the fluid flow, etc., are complicated by many factors, and some parameters are difficult to measure directly. Therefore, some provisions in the standard are not determined scientifically, but rather In order to achieve consensus, one has to artificially determine

[0006] 4) Regarding the improvement of the measurement accuracy of the throttling differential pressure flowmeter: In view of the fact that the throttling differential pressure flowmeter occupies an important position in the flowmeter, it is of great significance to improve its measurement accuracy

[0007] In addition, the existing differential pressure flowmeters at home and abroad include GB / T2624-93 traditional orifice plates, nozzles, Venturi tubes and imported plug-in Verabar flowmeters. The problem of poor flow stability directly affects the accuracy of use

In addition, the existing flow rate requires at least 2.5D above the straight pipe section, the pressure loss is large, it is easy to block when measuring dirty media, and the maintenance intensity is increased. Therefore, there are requirements for the measurement fluid, which limits its use. Range of use for flow measurement

Images