Vacuum Sealing Roll Structure for Airtight Low-Dust Chambers
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Solution Overview
Problem
Existing vacuum-sealing devices generate significant friction between rotating and stationary members, leading to wear and dust generation, which can deteriorate the vacuum chamber environment.
Innovation Solution
A vacuum-sealing device design featuring rolls with elastic outer surfaces and rigid backup rolls, held by opposing members with gaps to minimize contact and maintain airtightness, reducing friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating roll contacts a stationary wear-resistant member with a pushing force to maintain airtightness, then airtightness is maintained, but friction force increases and causes wear and dust generation
Solution Approach 1:
The invention inverts the traditional sealing approach by making both sealing surfaces rotatable instead of having one stationary member. The backup roll (previously stationary) is now made rotatable, so both the process roll and backup roll rotate in the same direction, eliminating relative sliding motion and friction between them while maintaining the sealing function through their rotational contact.
2Reliability
If rotating rolls contact a dust seal member to prevent dust leakage, then sealing is improved, but friction causes wear and dust generation
Solution Approach 1:
The dust seal member is converted from a stationary component to a rotatable backup roll that rotates in the same direction as the process roll. This eliminates the sliding friction between the seal member and the roll, preventing wear and dust generation while maintaining the sealing function through rotational contact.
3Reliability
If a pushing force is applied between rotating and stationary members to maintain contact, then airtightness is maintained, but friction force increases
Solution Approach 1:
By making the backup roll rotatable instead of stationary, the invention eliminates the need for a pushing force to maintain contact between rotating and stationary members. Both rolls rotate in the same direction, creating a rolling contact that maintains airtightness without generating significant friction force.
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
The design achieves compatibility between airtightness and reduced friction, minimizing dust generation and improving the vacuum chamber environment.
Implementation Method 1
a first roll (21) that has a first outer circumferential surface (21b) made of a first elastic material (21b)
Data Source
AI summary
A vacuum-sealing device includes: a first roll; a second roll that contacts the first roll; a first holding member having a first space in which the first roll is held and which has an axis coincident with an axis of the first roll; and a second holding member having a second space in which the second roll is held and which has an axis coincident with an axis of the second roll. The first holding member has an inner circumferential surface that faces the outer circumferential surface of the first roll, and rotation of the first roll and the second roll in correspondence with each other causes a sheet material to pass.