Coriolis Flow Meter Fixing Element Reduces Pressure Dependence
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Solution Overview
Problem
Coriolis mass flow meters exhibit pressure dependence in measuring fluid mass flow and density, requiring additional pressure measurements for compensation, which increases costs and maintenance efforts.
Innovation Solution
The fixing element in the Coriolis mass flow meter is configured to allow deformation of the measuring tubes, sparing a part of the measuring tube circumference to facilitate a change in cross-sectional shape, thereby reducing stiffness and compensating for increased internal pressure, eliminating the need for separate pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the measuring tube is rigidly fixed to prevent movement, then measurement stability is improved, but pressure dependence increases because the tube cannot deform to compensate for internal pressure changes
Solution Approach 1:
The fixing element is designed to allow dynamic deformation of the measuring tube cross-section in response to internal pressure changes. The element spares a part of the measuring tube circumference, enabling the tube to change its cross-sectional shape when pressurized, which compensates for stiffness increases while maintaining measurement reliability through the controlled deformation mechanism.
2Stability of the object's composition
If a fixing element rests against the entire measuring tube circumference, then structural stability is improved, but the measuring tube cannot deform to reduce pressure dependence
Solution Approach 1:
The fixing element is configured to contact only a portion of the measuring tube circumference rather than the entire circumference. This segmentation allows the unsupported portion of the tube to deform freely in response to internal pressure, changing the cross-sectional shape to compensate for stiffness increases, while the fixed portion maintains structural stability.
3Measurement precision
If additional pressure measurement devices are installed to compensate for pressure dependence, then measurement accuracy is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The measuring tube system performs self-compensation for pressure effects through its own deformation characteristics. The fixing element configuration enables the tube to automatically adjust its cross-sectional shape in response to internal pressure changes, thereby compensating for stiffness increases without requiring external pressure sensors or additional measurement devices.
Solution Approach 2:
The invention converts the harmful effect of internal pressure (which increases tube stiffness and affects measurements) into a beneficial effect. By allowing controlled deformation through the specially configured fixing element, the pressure-induced cross-sectional shape change is used to compensate for the stiffness increase, transforming the harmful pressure effect into a self-correcting mechanism.
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 configuration significantly reduces or eliminates pressure dependence, minimizing the impact of pressure on measurement accuracy and reducing overall costs and maintenance by allowing the measuring tubes to deform freely, thus compensating for increased internal pressure without additional measurement requirements.
Implementation Method 1
a vibration exciter configured to cause vibration, preferably resonant vibration, of the measuring tube in a vibration direction
Implementation Method 2
Due to the vibration of the measuring tubes induced by the exciter, Coriolis forces act on the fluid flowing inside the measuring tube
Implementation Method 3
the fixing element is connected to the two measuring tubes in such a manner that a part of the measuring tube circumference of each measuring tube remains free... facilitate a change in cross-sectional shape
Implementation Method 4
Due to this change in cross section, the stiffness of the tubes against vibration in the vibration direction decreases
Data Source
AI summary
A Coriolis mass flow meter, comprising a housing with an inlet and an outlet for a fluid medium, which are arranged along a flow axis, two measuring tubes configured to allow the fluid medium to flow through them in a flow direction and arranged between the inlet and the outlet and having a measuring tube circumference on their external surface, a fixing element which connects the two measuring tubes in the region of the inlet and/or the outlet in such a manner that they are fixed in position relative to one another, wherein the fixing element includes a first connecting member and a second connecting member connected to both measuring tubes, and wherein each of the connecting members rests against the measuring tubes in such a manner that a part of the measuring tube circumference of each measuring tube remains free.