Improved optical fiber turbine flowmeter

Abstract

The invention provides an improved optical fiber turbine flowmeter. The improved optical fiber turbine flowmeter is composed of a shell (1), a front flow guide element (2), a fore bearing (3), a rotating turbine (4), a rear bearing (5), optical fiber (6) and a rear flow guide element (7). The helix angle beta of rotating turbine blades (12) of the turbine flowmeter is designed to be 45 degrees, and the helix angle beta of front flow guide element blades (10) is designed to be 45 degrees, so that driving moment of the rotating turbine (4) is effectively increased, the starting flow rate is reduced, the range ratio is increased, and sensitivity is improved. In addition, the optical fiber (6) is sealed in rear flow guide element blades (16), an optical fiber probe end face (8) is effectively prevented from being polluted by fluid, and therefore the flowmeter can operate reliably for a long time. Flattening, silver film plating and trepanning are conducted in a 2mm region at the tail end a rotating shaft (14) to obtain a through hole (11) and a silver film plated surface (13) of the rotating shaft, different reflection rates are provided, rotating speed signals are converted into optical signals of pulse changes, and the rotating speed of the turbine is measured by measuring the reflected light impulse frequency.

Description

technical field [0001] The invention relates to an improved fiber optic turbine flowmeter based on a traditional turbine flowmeter, and belongs to the technical field of flow measurement. Background technique [0002] Due to its small size, simple structure and low price, turbine flowmeters are widely used in petroleum, pharmaceutical, chemical and other fields, and can realize the flow measurement of water, oil, wine and other pipelines. At the same time, it has the advantages of high precision and reliable performance, and can be used as a calibration component in high-tech fields such as aerospace. However, the turbine flowmeter is limited by the turndown ratio and has a large dead zone, which limits its application range. Therefore, reducing the initial flow rate and expanding the linear working area will be an important measure to improve the performance of the turbine flowmeter and expand the application range. (Document 1: Xie Shengqiu, Zhang Shirong, Huang Shuwang,...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to meet the needs of medium and small flow measurement occasions in actual industrial production, reduce the initial flow rate of traditional turbine flowmeters, widen its range ratio and improve its sensitivity, and solve the problem of anti-pollution on the end face of the optical fiber probe of traditional optical fiber turbine flowmeters. An improved turbine flowmeter structure is proposed

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