Eddy Current Probe With Movable Yoke For Variable Flux
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Solution Overview
Problem
Eddy current flaw detection in magnetic pipes is hindered by variations in magnetic permeability and thickness, leading to suboptimal inspection performance due to fixed design parameters in existing eddy current flaw detection probes.
Innovation Solution
An eddy current flaw detection probe with a hollow-cylindrical first yoke and a freely insertable second yoke, along with a magnetic annular body, allows for adjustable magnetic flux density without altering the sizes or positions of permanent magnets, enabling optimized inspection for pipes with varying specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sizes and arrangement positions of permanent magnets and yokes are fixed in the probe design, then the manufacturing and operation are simplified, but the probe cannot adapt to magnetic pipes with varying permeability and thickness specifications
Solution Approach 1:
The probe incorporates a movable yoke that can be adjusted along the pipe surface, transforming the static probe structure into a dynamic system. This allows the magnetic flux density to be varied by changing the yoke position, enabling adaptation to different pipe permeability and thickness specifications without redesigning the entire probe for each case.
Solution Approach 2:
The invention enables changing the magnetic flux density parameter by adjusting the yoke position rather than changing the permanent magnet sizes or arrangement. This parameter adjustment mechanism allows the same probe to optimize its magnetic field for different pipe specifications, resolving the contradiction between adaptability and structural complexity.
2Measurement precision
If the probe is designed for specific pipe specifications, then the flaw detection accuracy is optimized for those specifications, but the probe cannot accurately inspect pipes with different permeability or thickness
Solution Approach 1:
The movable yoke creates a dynamic probe that can adjust its magnetic flux density to match different pipe specifications. This dynamic adjustment capability allows the probe to maintain optimal flaw detection accuracy across various pipe types with different permeability and thickness, eliminating the need for multiple fixed-design probes.
Solution Approach 2:
The probe design achieves multi-functionality by incorporating the adjustable yoke mechanism. A single probe structure can serve multiple pipe inspection purposes by varying the yoke position to generate appropriate magnetic flux density for different pipe specifications, making the probe universal rather than specification-specific.
3Reliability
If the magnetic flux density is increased to improve detection sensitivity, then the flaw detection capability is enhanced, but the permanent magnet sizes and arrangement must be changed for each pipe specification
Solution Approach 1:
The movable yoke provides a dynamic means to adjust magnetic flux density without changing the permanent magnets themselves. By moving the yoke to different positions, the magnetic coupling between the magnets and the pipe varies, thereby adjusting the flux density to optimize detection sensitivity for different pipe specifications without requiring redesign.
Solution Approach 2:
The yoke acts as an intermediary element between the permanent magnets and the pipe. By adjusting the yoke position, it mediates the magnetic flux transmission, allowing control over the magnetic flux density reaching the pipe. This intermediary mechanism enables sensitivity adjustment without directly modifying the permanent magnet configuration.
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 allows for accurate flaw inspection across magnetic pipes with different permeability and thickness specifications by dynamically adjusting the magnetic flux density, enhancing detection performance without requiring design changes.
Implementation Method 1
a sensing coil wound along the outer peripheral surface in a center part of the axis direction of the first yoke and detecting a change in a magnetic flux generated by the first permanent magnet and the second permanent magnet
Implementation Method 2
permanent magnets whose magnetization directions are in the radial direction of the yoke and whose magnetic poles on the yoke side are different from each other are arranged around the yoke on both sides of the sensing coil
Implementation Method 3
accurate flaw detection is not achieved because an eddy current flows merely on the surface of the magnetic pipe
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The eddy current flaw detection probe (100) includes a first yoke (1), a second yoke (2), a first permanent magnet (3), a second permanent magnet (4), a sensing coil (6). The second yoke (2) is inserted in a freely insertable and extractable manner along an inner peripheral surface of the first yoke (1).