Axial Flow Can-Roller for Vacuum Processing Heat Exchange
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Solution Overview
Problem
The existing can-rollers for vacuum processing apparatuses are challenged by the need to minimize size while maintaining effective heat exchange, as large cooling water flow passages reduce heat exchange effectiveness and increase the can-roller's size, and spiral protrusions on the outer cylindrical surface complicate the structure and increase costs.
Innovation Solution
A can-roller design with axial flow passages that overlap the cover body cross-section, divided into multiple pieces to minimize size and specific surface area, and dented cover bodies to facilitate uniform fluid flow, eliminating the need for spiral protrusions, which maintains heat exchange effectiveness without enlarging the can-roller and reducing product costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the area of the flow passage is increased to improve cooling water flow, then the heat absorbing area and heat radiation area become larger, but the heat exchange effectiveness with the sheet-like base material is lowered
Solution Approach 1:
The flow passage is divided into multiple segments along the axial direction, with each segment having a limited length. This segmentation allows the cooling water to flow through multiple discrete sections, increasing the total heat exchange area without requiring a single large flow passage that would reduce heat exchange effectiveness. The segmented structure enables better thermal coupling with the sheet-like base material while maintaining adequate cooling water flow.
2Volume of moving object
If the can-roller size is reduced to minimize space, then the cooling water flow passage volume decreases, but the heat exchange effectiveness is compromised
Solution Approach 1:
The flow passage is designed to extend in the axial direction of the can-roller, utilizing the axial dimension to provide sufficient cooling water flow path length without increasing the radial or circumferential dimensions. This dimensional approach allows the can-roller to maintain a compact size while incorporating an adequate volume of cooling water flow passage for effective heat exchange.
3Reliability
If spiral protrusions are added to the outer cylindrical surface to improve fluid flow, then heat exchange effectiveness is enhanced, but the structure becomes more complex and costs increase
Solution Approach 1:
The complex spiral protrusion structure is removed from the design. Instead, the invention uses a simpler flow passage configuration within the can-roller that achieves adequate heat exchange effectiveness without requiring external spiral protrusions on the outer cylindrical surface. This extraction of the complicated structural element reduces manufacturing complexity and costs while maintaining the essential heat exchange function.
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 prevents enlargement of the can-roller, reduces the volume of cooling water, minimizes heat exchange area, and maintains effective heat transfer, while reducing temperature distribution and product costs by ensuring uniform fluid flow and minimizing temperature differences within the fluid and the sheet-like base material.
Implementation Method 1
there is provided a can-roller... around which the sheet-like base material is wound... When the predetermined processing is performed on the sheet-like base material, there is a case in which the can-roller and the sheet-like base material that has been taken up around the can-roller receives a heat input due to radiant heat and the like from the processing unit
Implementation Method 2
receives a heat input due to radiant heat and the like from the processing unit
Data Source
AI summary
In a vacuum processing apparatus for performing a predetermined vacuum processing on a surface of a sheet-like base material while keeping the base material to travel inside the vacuum chamber, the can-roller of this invention disposed to lie opposite to a vacuum processing unit has an axial body; an inner cylindrical body to be inserted onto an outside of the axial body; an outer cylindrical body enclosing an outer cylindrical surface of the inner cylindrical body with a gap therebetween, and cover bodies for respectively closing axial both ends of the inner cylindrical body. Each of the cover bodies has a plurality of flow passages. A cross-section of each of the fluid passages overlaps a cross-section of the cover body. A cross-sectional area of the gap between the inner cylindrical body and the outer cylindrical body is set to a size that can obtain a predetermined flow velocity.