A cantilever beam type fluid density meter and its detection method

Abstract

The invention discloses a cantilever beam type fluid densimeter and a detection method thereof. The cantilever beam type fluid densimeter comprises a shell, a measuring pipe, a first corrugated pipe, a second corrugated pipe, a fluid inlet flange, a fluid outlet flange, a cantilever beam, a fastening device, a vibration exciter and vibration pickup. According to the detection method, the inherent frequency of a system composed of the cantilever beam, the measuring pipe and internal fluid of the measuring pipe is obtained fluid through an elastic mechanics theory, and then the density of the fluid in the measuring pipe is solved. According to the cantilever beam type fluid densimeter and the detection method, the density of the fluid is measured through the cantilever beam, the influence of the outside vibration on the fluid density detection accuracy can be eliminated to the maximum degree, the detection accuracy is high, and meanwhile, the detection accuracy is not affected by the fluid temperature and pressure changes when the density of fluid is detected through the cantilever beam type fluid densimeter.

Description

technical field [0001] The invention belongs to the technical field of fluid density detection, in particular to a cantilever beam type fluid density meter and a detection method thereof. Background technique [0002] There are various instruments for detecting fluid density on the market, mainly including vibrating tube fluid density meters, ray fluid density meters, float fluid density meters and static pressure fluid density meters. The density detection instrument with high efficiency and long service life is the vibrating tube fluid density meter. When an exciting force is applied to the system composed of the vibrating tube and the fluid to be measured inside it to keep it in a resonance state, by detecting the exciting frequency of the exciting force at this time, the determined functional relationship can be used to calculate the inner part of the vibrating tube to be measured. density of the fluid. Most of the vibrating tube fluid densitometers on the market use r...

AI Technical Summary

Problems solved by technology

In most vibrating tube fluid density meters on the market, a rigid connection is used between the two ends of the vibrating tube and the fixed frame—welding. When the external vibration of the vibrating tube fluid density meter is too severe, the internal vibrating tube The vibration will be affected by the external vibration, so that the density of the detected fluid is inaccurate

[0003] Lu Fa and Zhang Xiaozhang proposed a single straight tube vibrating fluid density meter performance experimental research ("Nuclear Power Engineering", June 2012, Volume 33 Supplement 1, 19-22.) Type fluid density meter, the two ends of the vibrating tube in the density meter and the fixed frame are connected by bellows, which can effectively reduce the impact of external vibration on the detection accuracy of the density meter. However, the detection accuracy of this type of density meter The principle is still the detection principle of the traditional vibrating tube fluid density meter. The core component to detect the density of the fluid is still the vibrating tube. Although it can reduce the impact of external vibration on the vibration of the vibrating tube, it cannot significantly reduce or even Completely eliminate the influence of external vibration on its detection accuracy. In addition, since the core component of the traditional vibrating tube fluid density meter to detect the density of the fluid is the vibrating tube, when using the traditional vibrating tube fluid density meter to detect the density of the fluid, in order To ensure high detection accuracy and stability of detection values, the shape, structure and performance parameters of the vibrating tube inside the vibrating tube fluid density meter should be fixed. However, when the temperature and pressure of the fluid to be detected change The structure and size of the vibrating tube will change to a certain extent, which will affect the stiffness of the vibrating tube, which will eventually lead to a decrease in the detection accuracy of the vibrating tube fluid density meter, resulting in a large error in the detected fluid density value.

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