Asymmetric Coil Geometry for Collision-Free Vibronic Flow Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing single-measuring pipe flow meters face challenges in avoiding interaction with the environment by managing vibration energy and mitigating disruptive vibrations, which can lead to collisions between coils and magnets in vibration sensors.
Innovation Solution
A vibronic flow meter design featuring a single S-shaped measuring pipeline with a carrier plate and vibration sensors, where the pathogen coil and sensor coil have an elongated shape with specific diameter ratios and orientations, preventing collisions between magnets and coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring pipe oscillates in a bending vibration mode, then mass flow measurement is enabled, but collisions between coils and magnets may occur during interference modes
Solution Approach 1:
The patent applies asymmetry by using an elongated coil shape with different diameters in two perpendicular directions (first diameter d1 and second diameter d2). The coil opening has a largest diameter d1 in a first direction and a smallest diameter d2 in a second direction perpendicular to the first direction, creating an asymmetric geometry that prevents collision while maintaining measurement functionality
Solution Approach 2:
The patent resolves the collision problem by transitioning from a circular cross-section to an elliptical cross-section in the coil opening. This dimensional change allows the magnet to oscillate collision-free in the direction of the smallest diameter d2 while maintaining adequate spacing in the direction of the largest diameter d1, effectively using the second dimension to solve the collision constraint
2Reliability
If the coil opening diameter is increased to prevent collisions, then collision-free operation is achieved, but measurement sensitivity decreases
Solution Approach 1:
The patent applies local quality by creating non-uniform spacing between the magnet and coil around the perimeter of the coil opening. The elongated coil shape provides larger spacing in the direction of the largest diameter d1 (preventing collision) while maintaining smaller spacing in the direction of the smallest diameter d2 (preserving sensitivity), allowing different regions of the coil to have different quality characteristics
Solution Approach 2:
The asymmetric elliptical coil opening with different diameters d1 and d2 allows the system to optimize for both collision prevention and measurement sensitivity simultaneously, rather than requiring a uniform increase in size that would reduce sensitivity
3Device complexity
If a single measuring pipe is used, then flow divider components are eliminated, but vibration energy coupling with the environment increases
Solution Approach 1:
The patent uses mechanical vibration principles by employing an excitation device to generate controlled bending vibrations in the measuring pipe at a excitation frequency. The evaluation device detects vibrations at this specific frequency, allowing the system to distinguish the useful measurement signal from environmental vibrations and other interference, thus resolving the vibration coupling problem inherent in single-pipe designs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves collision-free operation of the magnets and coils, maintaining high measurement sensitivity while preventing interference and ensuring reliable operation even at lower frequencies.
Implementation Method 1
the at least one vibration exciter comprises an excitation coil and/or the at least two vibration sensors each comprise a sensor coil, wherein the at least one vibration exciter comprises an excitation magnet and/or the at least two vibration sensors each comprise a sensor magnet
Implementation Method 2
the at least one vibration exciter comprises an excitation coil and/or the at least two vibration sensors each comprise a sensor coil, wherein the at least one vibration exciter comprises an excitation magnet and/or the at least two vibration sensors each comprise a sensor magnet
Data Source
Figure 1~2
AI summary
The invention relates to a vibronic sensor (100) for measuring the mass flow rate of a flowing medium, comprising: - a measurement pipe (10) capable of vibration for conducting the medium; - at least one excitation magnet (36) and at least two sensor magnets (38); - at least one excitation coil (37) and at least two sensor coils (39) each having an elongated basic shape, wherein the basic shape has a centre of gravity through which a largest diameter having a length d 1 and a smallest diameter having a length d 2 extend, wherein the excitation coil (37) and/or the sensor coil (39) have a first coil axis (A) and a second coil axis (B) in a cross-sectional plane, wherein the largest diameter d1 is in the first coil axis (A), wherein the smallest diameter d 2 is in the second coil axis (B), wherein, for a quotient d 1 / d 2 , 1.15 ≤ d 1 / d 2 , wherein the measurement pipe (10) is designed in such a way that, when the measurement pipe (10) vibrates in an, in particular smallest, in-plane mode, a deflection direction of the measurement pipe (10) is oriented in parallel with the first coil axis (A) in a region of the excitation magnet (36) and/or the sensor magnet (38).