Magnetic-inductive Flowmeter Pole Shoe Alignment
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Solution Overview
Problem
Magnetic-inductive flowmeters face challenges in maintaining measuring accuracy under low flow velocity and conductivity conditions, where induced measuring voltages are low and susceptible to interference, and in withstanding high pressure without compromising the magnetic field strength, especially when using less durable materials like plastic for the measuring tube.
Innovation Solution
The implementation of several support lugs between the measuring tube portion and the pole shoe to maintain the alignment and position of the pole shoe close to the measuring tube, reducing buckling and ensuring a strong, homogeneous magnetic field, while using a thin portion to minimize magnetic field attenuation and enhance pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the measuring tube portion is made thin to minimize magnetic field attenuation, then the magnetic field strength is improved, but the pressure resistance deteriorates
Solution Approach 1:
The measuring tube portion is made thin only in the specific area where the pole shoe is positioned to minimize magnetic field attenuation, while other parts of the measuring tube maintain sufficient thickness for pressure resistance. This localized thinning allows the magnetic field to penetrate effectively without compromising the overall structural integrity of the tube under pressure.
2Power
If the pole shoe is positioned close to the measuring tube to enhance magnetic field strength, then the magnetic field strength is improved, but the alignment stability deteriorates
Solution Approach 1:
Support lugs are pre-positioned on the measuring tube portion to establish and maintain the correct alignment and position of the pole shoe before the magnetic field generation process begins. These support lugs ensure that the pole shoe remains stable and properly aligned even when positioned close to the thin measuring tube portion, preventing any potential misalignment during operation.
3Ease of manufacture
If less durable materials like plastic are used for the measuring tube to reduce cost, then the ease of manufacture is improved, but the pressure resistance deteriorates
Solution Approach 1:
The plastic measuring tube is designed with locally reinforced areas, particularly in the region where the pole shoe is positioned, to compensate for the inherent lower durability of plastic material. This localized reinforcement allows the use of cost-effective plastic material while maintaining sufficient pressure resistance in critical areas.
4Loss of substance
If the measuring tube portion is made thin to reduce material usage, then the loss of substance is improved, but the buckling resistance deteriorates
Solution Approach 1:
Support lugs are pre-installed on the thin measuring tube portion to provide structural reinforcement against buckling before the tube is subjected to pressure loads. These support lugs prevent the thin tube wall from buckling outward under pressure, enabling the use of material-efficient thin walls without compromising structural stability.
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 improves the stability and alignment of the pole shoe, maintaining a strong and homogeneous magnetic field while preventing buckling and ensuring the magnetic-inductive flowmeter's accuracy and pressure resistance, even with a thin plastic measuring tube portion.
Implementation Method 1
According to Faraday's law of induction, an electric field strength is formed perpendicular to the direction of flow of the medium and perpendicular to the magnetic field in a flowing, electrically conductive medium interfused by a magnetic field.
Implementation Method 2
a magnetic field generator for generating a magnetic field at least partially interfusing the measuring tube... the generated magnetic field has at least one component perpendicular to the longitudinal axis of the measuring tube or perpendicular to the direction of flow of the medium.
Data Source
AI summary
A magnetic-inductive flowmeter for measuring flow of a flowing medium, having a measuring tube, a magnetic field generator, at least one measuring electrode and a measuring section that is flat on one side having a planar measuring tube portion. Furthermore, the magnetic field generator has at least one coil core and a pole shoe. The magnetic-inductive flowmeter is improved compared to the prior art by several support lugs being present between the planar measuring tube portion and the pole shoe.