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Fixed type self vibration damping difference flow sensor

A flow sensor, fixed technology, applied in the field of flow sensors, can solve problems such as limited ability to resist pipeline vibration, weak anti-interference ability of flow sensors, and large noise mixed into the output signal, achieving a large range, strong anti-interference, The effect of high reliability

Inactive Publication Date: 2003-07-23
ZHEJIANG UNIV
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  • Application Information

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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.

Method used

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  • Fixed type self vibration damping difference flow sensor
  • Fixed type self vibration damping difference flow sensor
  • Fixed type self vibration damping difference flow sensor

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Embodiment Construction

[0009] refer to figure 1 , the fixed self-damping flow sensor includes detection units symmetrically fixed on both sides of the plate 6, each detection unit includes a housing 5, in order to obtain a more stable signal, generally use a semi-cylindrical housing, the housing 5 has a m-m parallel through hole 7, there is a boss in the middle of the through hole 7 that divides the through hole into two symmetrical sections up and down. It is connected to the outlet hole 4, and the two ends of the through hole 7 are respectively sealed by elastic diaphragms 1. There are piezoelectric ceramic sheets 3 and ring-shaped insulating ceramic blocks 2 in each interval, and one end of the piezoelectric ceramic sheet is connected to the elastic diaphragm 1. Welding, the insulating ceramic block 2 is sandwiched between the boss and the piezoelectric ceramic sheet, and there is a gap between the periphery of the piezoelectric ceramic sheet 3 and the insulating ceramic block 2 and the wall of t...

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Abstract

The senso rincludes the detection units fixed on the two sides of the flat plate symmetrically. Each detection unit includes the body case possessing the through hole parallel to the axis m-m of the flat plate. The male tab in the middle of the through hole divides the through hole into upper and lower symmetrical space intervals. The elastic membranes seal the two ends of the through hole. Thereare the piezoelectric ceramic sheet and the insulation quality block between the tab and the ceramic sheet in each space interval. One end of each ceramic sheet is fixed on the elastic membrane. The connected lead wires of the two ceramic sheets are leaded out through the axial out hole of the flat plate. The sensor possesses the sensitivity, strong antivibration ability, large range and high reliability.

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 great n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/32
Inventor 宋开臣张圣宾
Owner ZHEJIANG UNIV
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