Induction Heating Roller Groove Structure for Axial Temperature Uniformity
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Solution Overview
Problem
The existing induction heating rollers suffer from uneven temperature distribution along the axial direction of the roller surface due to the magnetic flux primarily passing through the corner portion between the outer cylindrical part and the end face part, leading to inadequate heating at one end portion and reduced strength of the roller main body when attempting to improve heat generation.
Innovation Solution
The induction heating roller incorporates a groove portion on the inner surface of the end face part between the heating target and the heater, allowing the magnetic flux to detour and facilitate heat generation at the one end portion, while maintaining the rigidity and strength of the roller main body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the thickness of the end face part is reduced to allow magnetic flux to pass through, then the temperature distribution of the roller surface is improved, but the rigidity of the end face part is decreased and the strength of the roller main body is decreased
Solution Approach 1:
The groove portion is formed only in a specific region of the end face part (the region between the heating target and heater in the radial direction), creating local structural variation. This allows the magnetic flux to detour through areas with grooves while maintaining sufficient thickness and strength in other areas of the end face part, thus resolving the contradiction between temperature distribution improvement and strength maintenance
2Strength
If the thickness of the end face part is increased to maintain strength, then the rigidity of the end face part is improved, but the magnetic flux scarcely passes through the end face part and the one end portion of the roller main body is not sufficiently heated
Solution Approach 1:
By forming grooves only in specific regions rather than uniformly throughout the end face part, the design allows magnetic flux to concentrate in areas with grooves (facilitating heating) while maintaining sufficient material thickness in other areas (maintaining overall strength and rigidity)
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 effectively equalizes the temperature distribution along the axial direction of the roller surface, improves heat generation at the previously underheated portion, and maintains the structural integrity of the roller main body.
Implementation Method 1
an alternating magnetic flux is generated to pass through the iron core of the heater, the end face part, the outer cylindrical part, and the magnetic yoke. As a result, an eddy current is generated by electromagnetic induction to flow in the outer cylindrical part in the circumferential direction, and the outer cylindrical part is heated by Joule heat generated by the eddy current
Implementation Method 2
the outer cylindrical part is heated by Joule heat generated by the eddy current
Data Source
Figure 1
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AI summary
In an induction heating roller, the temperature distribution in an axial direction of a roller surface is equalized while decrease in strength of a roller main body is suppressed. An induction heating roller 30 includes a roller main body 31 and a heater 40. The roller main body 31 includes a cylindrical outer cylindrical part 33 and an end face part 35 connected to an end portion of the outer cylindrical part 33 on one end side in the axial direction. The heater 40 includes a coil 41 provided inside the roller main body 31. As an alternate current is supplied to the coil 41, the outer cylindrical part 33 is induction-heated. In an inner surface of the end face part 35, a groove portion 35a extending in the circumferential direction is formed in a region between the outer cylindrical part 33 and the heater 40 in the radial direction.