Magnetic-Inductive Flow Sensor Axial Contact Design
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Solution Overview
Problem
Magnetic-inductive flow measuring systems face challenges in construction and connection technology due to the placement of measuring electrodes, requiring complex contact arrangements and necessitating separate calibration for different measuring tube diameters, which complicates application and production.
Innovation Solution
The system redesigns measuring contacts to extend parallel or circularly around the measuring tube, allowing for universal contact compatibility across different diameters, and incorporates a measuring tube identification element and query element to automatically account for varying diameters, ensuring a homogeneous magnetic field for factory calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measuring electrodes are placed on different sides of the measuring tube with complex contact arrangements, then reliable electrical contact is achieved, but device complexity and connection difficulty increase
Solution Approach 1:
The patent transitions from radial contact arrangement to axial contact arrangement. Measuring contacts are extended axially along the measuring tube surface, allowing electrical contact to be established in the axial direction rather than requiring complex radial connections across different sides of the tube.
Solution Approach 2:
Multiple measuring contacts are merged into a single continuous axial contact structure. Instead of separate contacts on different sides requiring individual connections, the contacts are combined into one extended axial element that simplifies the connection topology.
2Measurement precision
If separate calibration is performed for each measuring tube diameter, then measurement precision is maintained, but calibration time and production complexity increase
Solution Approach 1:
The patent creates a universal calibration approach where a single calibration procedure works for multiple measuring tube diameters. The axial contact design and associated evaluation algorithm can universally handle different diameters without requiring diameter-specific calibration, making the calibration process multi-functional across various tube sizes.
Solution Approach 2:
The system automatically adapts to different measuring tube diameters by changing evaluation parameters based on the specific tube being used. Rather than calibrating for each diameter, the system adjusts operational parameters to maintain precision across varying dimensions.
3Ease of manufacture
If measuring contacts are extended axially along the measuring tube, then connection technology is simplified, but manufacturing precision requirements increase
Solution Approach 1:
The axial contact structure is designed to self-align with the measuring tube during assembly. The extended axial geometry provides natural alignment features that guide the contact into proper position, reducing the need for high-precision manual adjustment while maintaining reliable electrical connection.
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 solution simplifies the connection technology, allows for the use of measuring tubes with different diameters without additional calibration, and ensures accurate flow measurement across various diameters with a single factory calibration, enhancing application flexibility and production efficiency.
Implementation Method 1
According to Faraday's law of induction, an electric field strength is generated in a flowing, electrically conductive medium perpendicular to the flow direction of the medium and perpendicular to the magnetic field when a magnetic field is present
Implementation Method 2
at least two measuring electrodes that detect the measuring voltage induced in the electrically conductive medium and preferably touch the medium
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Described and illustrated is a magnetic-inductive flow-through measurement system, comprising a measuring tube (1) for an electrically conductive medium to flow through, and comprising a magnetic field generating device (2) for generating a preferably alternating magnetic field running at least also perpendicular to the longitudinal axis of the measuring tube (1), comprising at least two measuring electrodes (3, 4) which tap the measurement voltage induced in the electrically conductive medium and which preferably make contact with the medium, and comprising an evaluation unit (not shown), wherein the measuring electrodes (3, 4) have measuring contacts (5, 6) which are accessible externally on the measuring tube (1), and the measuring tube (1) together with the measuring electrodes (3, 4) form a first functional unit, and counter-contacts (7, 8) corresponding to the measuring contacts (5, 6) of the measuring electrodes (3, 4), the magnetic field generating device (2) and the evaluation unit (not shown) form a second functional unit, and wherein the counter-contacts (7, 8), the magnetic field generating device (2) and the evaluation unit (not shown) are provided in a measurement system housing (not shown). The known magnetic-inductive flow-through measurement systems have design and connection disadvantages, and one of the objects of the invention is to eliminate these disadvantages. This object is achieved in that the measuring contacts (5, 6) of the measuring electrodes (3, 4) are provided on the measuring tube (1) in such a way, and the counter-contacts (7, 8) corresponding to the measuring contacts (5, 6) of the measuring electrodes (3, 4) are arranged in the measurement system housing in such a way, that the measuring contacts (5, 6) can be brought into electrically conductive contact with the counter-contacts (7, 8) by a movement running substantially perpendicular to the magnetic field direction, this movement being substantially only a translational movement.