Heatable roll
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Solution Overview
Problem
Existing heated rollers in industrial machines face challenges such as construction complexity, high maintenance costs, and risks of overheating due to the use of large volumes of heat transfer fluid, which lead to inefficiencies and safety concerns.
Innovation Solution
A rotating roller design featuring a hollow casing with a heating assembly housed in a sealed chamber, where the heating means are immersed in a heat transfer fluid, reducing the risk of overheating and allowing for efficient heat transfer with a lower fluid volume, and incorporating filling means that provide swirling motions for enhanced thermal uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If large volumes of heat transfer fluid are used to ensure good thermal efficiency, then thermal uniformity is improved, but thermal inertia increases and maintenance complexity increases
Solution Approach 1:
The roller is divided into multiple independent heating zones with separate fluid circuits, allowing localized maintenance and reducing the impact of fluid loss in one zone on the entire system
Solution Approach 2:
The system incorporates automatic fluid level sensors and refill mechanisms that maintain optimal fluid levels without manual intervention, reducing maintenance burden while preserving thermal efficiency
2Use of energy by moving object
If electrical resistances are inserted directly in contact with heat transfer fluid, then heating efficiency is improved, but risk of oil leaks increases
Solution Approach 1:
A sealed heating element housing acts as an intermediary barrier between the electrical resistance and the heat transfer fluid, allowing efficient heat transfer through the housing walls while preventing direct contact that could lead to leaks
Solution Approach 2:
The heating element housing is designed with redundant sealing mechanisms and pressure relief features that prevent leak conditions before they occur, addressing potential failure modes in advance
3Device complexity
If reduced diameter inner jacket is used, then construction complexity is reduced, but risk of overheating increases
Solution Approach 1:
The system incorporates variable speed pumps and controllable heating elements that dynamically adjust fluid flow and heat input based on real-time temperature sensors, preventing overheating while maintaining simple jacket geometry
Solution Approach 2:
Temperature sensors positioned throughout the fluid circuit provide continuous feedback to the control system, which adjusts heating power and fluid flow to maintain safe operating temperatures in the reduced-diameter jacket
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 enhances thermal efficiency, reduces maintenance time, and decreases operational costs by minimizing fluid usage and heating time while ensuring consistent heat distribution across the roller's surface.
Implementation Method 1
heating means for heating it are housed in said sealed chamber
Implementation Method 2
heat transfer fluid in contact with the inner mantle surface of the roller
Implementation Method 3
filling means arranged in the annular region and shaped so as to partially occupy the latter... provide swirling motions for enhanced thermal uniformity
Data Source
Figure 1~2
Figure 3
Figure 4a~5
AI summary
The present invention relates to a heated roller applicable to rotary machines usable in various production sectors, comprising a casing provided with a mantle wall and a heating assembly. The heating assembly comprises at least one hollow body, arranged internally and preferably coaxially to the casing, so as to define an annular region comprised between the mantle wall and the at least one hollow body; the hollow body presenting an inner chamber, fluidically insulated from the annular region, wherein heating means are housed. The roller further comprises filling means arranged in the annular region and shaped so as to partially occupy the latter. The overall configuration of the roller is such that within the annular region a residual volume is defined, intended to receive, in use, a heat transfer fluid in such a way as to allow the heating assembly to be completely immersed in each operating position of the roller and to keep checked the pressure values within the annular region during full operation of the machine.