Coriolis Measuring Sensor Tube Reinforcement for Vibration Stability
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Solution Overview
Problem
Existing Coriolis flowmeters are limited by fixing elements that restrict the vibration range of the measuring tubes, thereby affecting the measuring performance.
Innovation Solution
A Coriolis sensor with specific arrangements of fixing elements and stiffening elements in the measuring tube bends, where the fixing elements are positioned at most 0.7 arc lengths from the outer end of the measuring tube bends and stiffening elements are placed between these groups, maintaining a minimum distance of 0.1 arc lengths, to enhance vibration range and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixing elements are used to define vibration nodes in Coriolis flowmeters, then the vibration nodes are properly defined and measurement stability is improved, but the vibration range of the measuring tube is limited and measuring performance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the functional requirements at different locations of the measuring tube. Fixing elements are strategically positioned at specific locations (within 0.7 arc lengths from outer ends) to define vibration nodes, while stiffening elements are placed at other locations (between fixing elements, at least 0.1 arc lengths from inner ends) to enhance local stiffness. This localized differentiation allows the tube to achieve both stable vibration node definition and extended vibration range.
Solution Approach 2:
The patent employs composite structural elements by combining fixing elements and stiffening elements within the same measuring tube system. The fixing elements provide node definition while the stiffening elements (arranged between fixing elements) provide additional structural support and stiffness. This composite approach allows the measuring tube to simultaneously achieve proper vibration node definition and extended vibration range, resolving the contradiction between measurement stability and vibration range.
2Adaptability or versatility
If the measuring tube diameter is allowed to vary with medium pressure, then the tube can accommodate pressure changes, but the stiffness of the measuring tube changes and vibration characteristics are affected
Solution Approach 1:
The patent applies local quality by concentrating stiffening elements specifically in the outer bend regions of the measuring tube, where pressure-induced diameter variations have the most significant impact on vibration characteristics. The stiffening elements are positioned at least 0.1 arc lengths from the inner ends of the outer bends, providing localized reinforcement that maintains stiffness stability while allowing the tube to adapt to pressure changes in other regions.
Solution Approach 2:
The patent utilizes parameter changes by strategically positioning stiffening elements to modify the local stiffness parameter of the measuring tube in the outer bend regions. By adjusting the location and distribution of stiffening elements (maintaining at least 0.1 arc lengths from inner ends), the tube's stiffness is enhanced in critical areas while maintaining overall adaptability to medium pressure variations.
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 solution increases the vibration range and reduces the dependence of the measuring tube diameter on medium pressure, stabilizing the stiffness and improving measuring performance.
Implementation Method 1
at least one exciter for generating measuring tube vibrations, as well as an inlet-side first sensor and an outlet-side second sensor for detecting measuring tube vibrations
Implementation Method 2
the fixing elements each fix the measuring tubes of the measuring tube pair to each other, wherein the fixing elements along the measuring tube centerline each have a first distance to an outer end of the respective measuring tube arc
Implementation Method 3
the outer measuring tube arcs each have at least one stiffening element, wherein the stiffening elements are each arranged between the groups of fixing elements, wherein the stiffening elements each have a second distance to an inner end of the respective measuring tube arc
Data Source
Figure 1
Figure 2a~2b
AI summary
The invention relates to a Coriolis measuring sensor (10) of a Coriolis measuring device (1), the Coriolis measuring sensor comprising: at least one pair of measuring tubes (11); at least one exciter (12) and at least two sensing elements (13); two collectors (14), the measuring tubes each having a first outer measuring tube arc (11.61) and a second outer measuring tube arc (11.62); and, per pair of measuring tubes, a first group of securing elements (15.1) with at least two securing elements (15) and a second group of securing elements (15.2) with at least two securing elements (15), characterised in that the securing elements each have a first distance (16.1) from an outer end (11.71) of the relevant measuring tube arc along the measuring tube centre line, which distance is at most 0.7 arc lengths and in particular 0.5 arc lengths (11.63), wherein the outer measuring tube arcs each have at least one reinforcing element (17), the reinforcing elements each being situated between the groups of securing elements, and the reinforcing elements each having a second distance (16.2) from an inner end (11.72) of the relevant measuring tube arc, the second distance being at least 0.2 arc lengths.