Resonant cylinder type liquid density sensor

Abstract

The invention relates to liquid density measurement and provides a resonant cylinder type liquid density sensor which has the advantages of capacity of realizing real-time on-line measuring of liquid density, high measurement accuracy, stability, reliability, a simple structure, a small volume, convenience in installation and maintenance and usability in severe conditions. A technical scheme provided in the invention is as follows: the resonant cylinder type liquid density sensor comprises a resonant cylinder, a diaphragm, a coil base, an excitation coil, vibration pick-up coils, an integral housing, an oil-proof aviation plug, a casing and a circuit board shell and adopts a split structure; the resonant cylinder is respectively integrated with the diaphragm and the coil base through laser welding; according to the working mode that m is equal to 1 and n is equal to 3, a work pattern of single excitation and dual pick-up vibration is used; the integral housing and the periphery structure of the resonant cylinder are in seal connection through high pressure punching and laser welding so as to ensure that the external sides of the resonant cylinder are isolated from the excitation coil, the vibration pick-up coils and the liquid to be measured. The liquid density sensor provided in the invention is mainly applicable to liquid density measurement.

Description

technical field [0001] The invention relates to the measurement of liquid density, in particular to a resonant cylinder type liquid density sensor. Background technique [0002] Density is one of the important physical properties of liquids, and the measurement of liquid density is of great significance in the fields of food manufacturing, petrochemical and aerospace. The resonant sensor can realize online continuous measurement, has excellent performances such as good stability, high resolution, high measurement accuracy, and easy realization of digital long-distance transmission, and has become a hot research topic today. According to the shape of the resonator, the resonant sensor can be divided into vibrating cylinder type, vibrating wire type, thin plate type, tuning fork type, U-shaped tube type, double tube type, single tube type, etc. The forms of resonant liquid density meters studied in China mainly include vibrating tube type, vibrating membrane type and vibratin...

AI Technical Summary

Problems solved by technology

Chinese patent CN1837775A discloses a resonant type liquid density on-line measurement sensor. Its working principle is to use the natural frequency of a thin-walled cylinder to measure the liquid density. Its excitation and pickup coils are in contact with the measured liquid. In practical applications, this structure requires Do complete insulation protection, otherwise it will affect the measurement accuracy and the reliability of the whole system. In addition, its vibrating cylinder, excitation, and vibration pickup coils are completely immersed in the measured liquid, which is easily polluted by the measured liquid, and it is not easy to clean and maintain.

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