Induction Heating Coil with Variable Flow Channels
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Solution Overview
Problem
Induction heating coils for tubular workpieces face reduced heating efficiency at lower frequencies, and insufficient cooling due to limited coolant flow rates, leading to potential overheating and degradation.
Innovation Solution
The heating coil design features lead portions with a larger cross-sectional area for coolant flow channels than the head portion, increasing coolant flow rates and reducing pressure loss, thereby enhancing cooling efficiency and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power supplied to the heating coil is increased to compensate for lower heating efficiency at lower frequencies, then heating capability is maintained, but heat generated from the heating coil increases causing insufficient cooling and rapid deterioration
Solution Approach 1:
The patent applies local quality by differentiating the cross-sectional areas of flow channels in different parts of the heating coil. The lead portions have larger cross-sectional areas than the head portion, creating non-uniform flow distribution that optimizes cooling where needed most while maintaining heating performance
2Ease of manufacture
If the flow rate of coolant is limited by the shape of the flow channel inside the lead portions, then the structure is simple, but the heating coil cannot be sufficiently cooled and may be deteriorated rapidly
Solution Approach 1:
The patent changes the geometric parameter of the flow channel cross-sectional area along the length of the heating coil. By increasing the cross-sectional area in the lead portions compared to the head portion, the coolant flow rate is enhanced without complicating the overall simple tubular structure
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 heating efficiency and extends the lifespan of the heating coil by maintaining effective cooling even at lower frequencies and smaller workpiece diameters, reducing the risk of overheating and degradation.
Implementation Method 1
a heating coil for induction heating of an inner surface of a tubular workpiece
Implementation Method 2
head portion configured to be inserted into the workpiece to inductively heat the inner surface of the workpiece
Implementation Method 3
The heating coil is cooled using coolant flowing therein
Implementation Method 4
head portion and the lead portions are formed by using pipe members, forming a series of flow channels through which coolant flows
Data Source
AI summary
A heating coil is configured to inductively heat an inner surface of a tubular workpiece. The heating coil includes a head portion configured to be inserted into the workpiece and to inductively heat the inner surface of the workpiece, and a pair of lead portions connected to one end of the head portion and the other end of the head portion respectively. The head portion and the lead portions are configured as pipe members forming a series of flow channels through which coolant flows. A cross-sectional area of the flow channel inside each of the lead portion is greater than a cross-sectional area of the flow channel inside the head portion.