Jacketed Radiant Heating Tube with Inward Beads
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Solution Overview
Problem
Existing jacketed radiant heating tubes in industrial furnaces face issues with complex structures leading to increased flow resistance and material stresses due to turbulence, and high production costs.
Innovation Solution
The implementation of inward beads in the jacket tube to guide exhaust gases and serve as spacer elements, allowing for improved gas flow routing and centering of the flame tube, reducing flow resistance and material stresses while enabling cost-effective production through a simplified geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the flame tube is made up of multiple tube pieces connected by clamps with bolt-shaped holding elements, then the flame tube can be assembled, but the multi-part structure increases flow resistance due to turbulence and increases manufacturing complexity
Solution Approach 1:
The patent merges multiple tube pieces into a single-piece flame tube constructed from hollow cylindrical tubes with integrated connection elements. The connection elements are formed as integral parts of the tube structure during extrusion, eliminating the need for separate clamps and bolt-shaped holding elements, thus reducing device complexity while maintaining assembly capability
Solution Approach 2:
The connection elements serve multiple functions: they provide structural connection between tube sections, act as centering elements during assembly, and maintain the annular space configuration. This multi-functionality reduces the need for separate specialized components, simplifying the overall structure
2Ease of operation
If tube sections have outer radial projections for centering in the jacket tube, then centering is achieved, but material stresses increase due to thermal loads and flow resistance increases due to turbulence
Solution Approach 1:
Instead of adding radial projections to the flame tube for centering, the patent inverts the approach by forming connection elements that protrude into the annular space between the flame tube and jacket tube. These inverted elements serve as centering features without requiring radial projections that would increase material stresses and cause turbulence
Solution Approach 2:
The connection elements are strategically positioned at specific locations around the circumference of the flame tube, providing centering functionality only where needed. This localized approach maintains smooth surfaces in critical heat transfer areas while achieving proper alignment, thus minimizing both material stresses and flow resistance
3Ease of operation
If spacer elements are formed on the flame tube to center it in the jacket tube, then centering is achieved, but the complex geometry increases manufacturing costs and affects heat conduction uniformity
Solution Approach 1:
The patent combines the spacer element function with the connection elements that are already integral to the flame tube structure. The same connection elements that provide structural unity and eliminate assembly complexity also serve as spacer elements for centering, thus achieving centering capability without additional manufacturing steps or cost increases
Solution Approach 2:
The connection elements perform multiple functions simultaneously: they provide structural connection between tube sections, serve as centering spacers in the annular space, and maintain the geometric configuration. This multi-functionality eliminates the need for separate spacer elements, reducing manufacturing complexity and cost while ensuring uniform heat conduction
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 significantly reduces production costs, enhances gas flow guidance, and ensures uniform heat conduction properties, minimizing thermal stresses and hotspots in the flame tube, resulting in a more efficient and cost-effective radiant heating solution.
Implementation Method 1
the number and design of which can be used to adjust the flow resistance and thus the flow speed and heat exchange of the exhaust gases with the jacket tube and the flame tube in the countercurrent principle
Implementation Method 2
the beads serve as spacer elements for centering the flame tube in the jacket tube
Implementation Method 3
the flame tube has particularly uniform heat conduction properties that contribute to a homogeneous heat output of the radiant tube
Implementation Method 4
The exhaust gases produced during combustion are guided through the inward beads in the jacket tube into exhaust gas ducts
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Jacketed radiant heating tube for heating furnace chambers of industrial furnaces with a jacketed tube (2) and a flame tube (3) arranged in it, to which a burner is assigned at one end (12), wherein the flame tube (3) is centered with respect to the jacketed tube (2) by spacer elements (4) and wherein channel-shaped spacer elements (4) are formed by grooves (6) projecting inwards into the jacketed tube (2), which define wall sections of exhaust gas channels (11) between jacketed tube (2) and flame tube (3).