Suspension type self vibration damping difference flow sensor

Abstract

The suspension type self-damping flow sensor of the present invention includes detection units symmetrically fixed on both sides of the plate, each detection unit includes a housing, and the housing has a through hole parallel to the axis m-m of the plate, and the through hole is connected to the axial outlet hole of the plate There are passages connected, and the two ends of the through hole are respectively sealed by elastic diaphragms. There are two piezoelectric ceramic sheets in the through hole. One end of the two piezoelectric ceramic sheets is respectively fixed with the elastic diaphragm, and the other end is connected with the The metal block between the ceramic sheets is fixed, and there is a gap between the periphery of the two piezoelectric ceramic sheets and the metal block and the wall of the through hole, and the lead wire of the metal block is drawn out from the outlet hole of the plate through the channel. This kind of sensor has high measurement sensitivity, and it can still give a strong detection signal by using the differential principle when the flow rate is small. Its suspended internal structure has strong anti-vibration, large range and reliability. high.

Description

technical field [0001] The present invention relates to flow sensors, especially self-damping differential flow sensors. Background technique [0002] In the late 1960s, new instruments that applied the principle of fluid vibration to measure flow appeared successively. For example, vortex flowmeters, jet flowmeters, and vortex precession flowmeters all belong to liquid vibration flowmeters. They pass heat-sensitive, strain, Flow sensors with detection methods such as capacitance and ultrasonic waves can detect fluid vibration frequency signals that are proportional to volume flow. For vibrating flow sensors, the vibration problem is an important indicator to measure the industrial application of a vibrating flow meter. Vibration in industry is ubiquitous, such as speed pulsation and fluid oscillation in fluid turbulence, and random factors such as industrial pipeline vibration, valve opening and closing, and valve core vibration, which will cause ...

AI Technical Summary

Problems solved by technology

However, the detection elements of these sensors are fixed on the pipe wall, and the ability to resist pipe vibration is limited.

In addition, for the interference of fluid vibration, when the vibration direction of the vibration noise is parallel to the vibration direction of the measured frequency signal (that is, vibration in the same direction), the anti-interference ability of these flow sensors is relatively weak, and the output signal will be mixed with a lot of noise.

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