Suspension type self-vibration suppression differential flow sensor

Abstract

The invention discloses a suspension type self-vibration suppression differential flow sensor which comprises two detection units symmetrically fixed at two sides of a panel, each detection unit comprises a shell, the shell has a through hole, which is parallel to the axis m-m of the panel, the through hole is connected with an axial direction outlet hole of the panel through a channel, the connection end of the through hole is sealed via the elastic membrane, two piezoelectric ceramic pieces are formed in the through hole, one of each of two piezoelectric ceramic pieces is fixed with the elastic membrane while the other end is fixed with a metal block between the piezoelectric ceramic pieces, the gaps are respectively formed between two piezoelectric ceramic pieces and the periphery of the metal block and the through hole, the lead of the metal block is guided outward through the outlet hole of the channel. The sensor has higher measuring sensitivity; stronger detection signal can be achieved at small flow, the suspension type interior structure has stronger anti-vibration property, greater measuring range and high reliability.

Description

technical field [0001] The invention relates to a flow sensor, in particular to a suspension type self-damping differential flow sensor. Background technique [0002] At the end of the 1960s, new instruments that applied the principle of fluid vibration to measure flow appeared one after another. For example, vortex flowmeters, jet flowmeters and vortex precession flowmeters belong to liquid vibration flowmeters. They pass heat-sensitive, strain, capacitance, Flow sensors with detection methods such as ultrasonic waves 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 great noise...

AI Technical Summary

Problems solved by technology

At present, the more advanced vibration flow sensors have a certain anti-vibration ability, but 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, in-phase vibration), the anti-interference ability of these flow sensors is relatively weak, and the output signal will be mixed with a lot of noise. This phenomenon is especially obvious when measuring small flow

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