Single Curved Tube Coriolis Flow Meter Balancing Structure
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Solution Overview
Problem
Single curved tube Coriolis flow meters face challenges in maintaining balance across a range of material densities, leading to vibration imbalances at the flanges, which existing methods fail to address effectively.
Innovation Solution
A Coriolis flow meter design utilizing a torsion member with a balance member that vibrates in opposite phase to the single curved flow tube, causing torsional deformation to balance vibrations, and a manifold spacer with flexible members to manage residual motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single curved tube design is used, then the problems associated with flow splitting and manifold clogging are eliminated, but vibration imbalance occurs at the flanges when material density changes
Solution Approach 1:
A balance member is attached to the flow tube assembly, positioned to vibrate in opposite phase to the single flow tube. This counterbalancing mechanism generates opposing vibrations that cancel out the imbalanced vibrations transmitted to the flanges, thereby resolving the vibration imbalance problem while maintaining the simplicity of single-tube design
Solution Approach 2:
The balancing system utilizes dynamic vibration characteristics where the balance member is designed to vibrate at the same frequency but in opposite phase to the flow tube. This dynamic counterbalancing approach allows the system to maintain vibration balance across varying material densities without requiring static structural modifications
2Stability of the object's composition
If a support plate with high mass is used to balance vibrations, then vibration cancellation is achieved for a single material density, but the flow meter becomes unbalanced when material density changes
Solution Approach 1:
Instead of relying on static mass properties, the invention employs dynamic vibration characteristics. The balance member is designed to vibratably couple with the flow tube and actively vibrate in opposite phase, allowing the system to maintain balance across varying densities through dynamic adjustment rather than static mass configuration
Solution Approach 2:
The system exploits changes in vibration parameters (frequency, phase, amplitude) in response to material density changes. By designing the balance member to respond dynamically to these parameter changes, the system maintains vibration balance across a range of operating conditions rather than being optimized for a single density
3Stability of the object's composition
If dual tube design with flow splitting is used, then vibration balance is achieved through symmetrical opposite-phase vibration, but pressure drop increases and manifold clogging occurs
Solution Approach 1:
The invention extracts and eliminates the manifold flow splitting component from the dual-tube design. By using a single flow tube without flow division, the harmful effects of pressure drop and clogging at the split point are removed, while the vibration balance function is achieved through the added balance member rather than through symmetrical flow splitting
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 ensures self-balancing across varying material densities, minimizing vibration at the flanges and maintaining accuracy by adjusting the stiffness of the flow tube, torsion member, and balance member to separate natural frequencies, thus maintaining operational stability.
Implementation Method 1
a center section of the torsion member... causing the torsion member to be deflected in torsion
Implementation Method 2
vibrating one or more flow tubes and measuring deflections, or phase differences, in the vibrating flow tubes induced by the Coriolis forces
Implementation Method 3
measuring deflections, or phase differences, in the vibrating flow tubes induced by the Coriolis forces from a material flowing through the flow tubes
Data Source
Figure 1
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AI summary
A Coriolis flow meter is disclosed that uses the deflection of a torsion member (430) to balance the vibration of a single curved flow tube (308). The two ends of the torsion member are attached to, and vibrate with, a center section of the single flow tube (308). A balance member (432) is attached to a center section of the torsion member (430) and vibrates in the opposite phase of the single flow tube (308) causing the torsion member (430) to be deflected in torsion.