Coriolis Flow Meter Connecting Device Stiffening
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Solution Overview
Problem
Coriolis mass flowmeters with two measuring tubes face significant interference from orthogonal vibrations, which distort the measurement signal due to insufficient frequency separation between excitation and orthogonal oscillations.
Innovation Solution
The connecting device is enhanced with a stiffening plate and fin arrangement, where the stiffening fin is perpendicular to the stiffening plate, increasing flexural rigidity in the common plane while reducing torsional rigidity, thereby separating excitation and orthogonal vibrations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring tubes are excited to vibrate in their common plane for mass flow measurement, then the measurement function is achieved, but orthogonal vibrations interfere with the measurement signal due to insufficient frequency separation
Solution Approach 1:
The patent changes the structural parameters of the connecting device by adding a stiffening fin perpendicular to the stiffening plate, which selectively modifies the flexural rigidity in the common plane while maintaining lower torsional rigidity for orthogonal vibrations. This parameter change creates greater frequency separation between excitation and orthogonal vibrations, reducing measurement interference
Solution Approach 2:
The stiffening fin is arranged asymmetrically perpendicular to the stiffening plate, creating different rigidity characteristics for different vibration directions. This asymmetry ensures that flexural vibrations in the common plane are restrained more than torsional vibrations perpendicular to it, achieving better frequency separation and reducing harmful orthogonal vibration interference
2Reliability
If the connecting device is made stiffer to reduce vibration interference, then frequency separation improves, but the device complexity increases
Solution Approach 1:
Instead of making the entire connecting device uniformly stiffer, the patent applies local stiffening only where needed by adding a stiffening fin perpendicular to the stiffening plate. This localized modification selectively increases flexural rigidity in the common plane while keeping torsional rigidity相对较低, achieving vibration isolation without excessive complexity
Solution Approach 2:
The connecting device is segmented into functional components: a stiffening plate for basic structural support and a stiffening fin for selective rigidity enhancement. This segmentation allows each component to perform its specific function efficiently, achieving reliable vibration isolation with minimal added complexity
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
This design significantly reduces the influence of orthogonal vibrations on the measurement signal, enhancing measurement accuracy by achieving better frequency separation and minimizing signal disturbance.
Implementation Method 1
a mass flow meter which works according to the Coriolis principle
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a mass flow meter operating according to the Coriolis principle, comprising two measuring tubes (1) running in a common plane at least in one section, and a connecting device (2) by means of which the two measuring tubes (1) are connected to each other in the section where they run in the common plane. According to the invention, the connecting device (2) has a stiffening plate (3) attached to both measuring tubes (1) and arranged parallel to the common plane of the measuring tubes, and a stiffening fin (5) is provided on the stiffening plate (3). In this way, the bending stiffness of the connecting device (2) for bends in the common plane of the measuring tubes (1), in which the excitation vibrations of the measuring tubes (1) generally also occur, can be made greater than the torsional stiffness of the connecting device (2) for torsional vibrations.As a result, the measurement accuracy of the Coriolis mass flow meter is improved.