Rotating Shaft Seal Structure to Prevent Assembly Overcompression
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Solution Overview
Problem
Existing valve devices face issues with excessive compression of the seal member during assembly, leading to potential rupture due to the positioning of the inner peripheral end of the second-side plate part radially outside the inner peripheral end of the first-side plate part.
Innovation Solution
The valve device incorporates a seal member with a specific plate-like structure and an annular attachment ring, where the first-side and second-side plate parts of the attachment ring sandwich and hold the seal member, with the inner peripheral end of the second-side plate part positioned radially outside the inner peripheral end of the first-side plate part. This configuration limits the load application area during assembly, preventing excessive compression of the seal member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inner peripheral end of the second-side plate part is positioned radially outside the inner peripheral end of the first-side plate part, then the seal member can be held securely between the plate parts, but excessive compression of the seal member occurs during assembly leading to potential rupture
Solution Approach 1:
The patent applies local quality by creating different functional zones on the first-side plate part: an outer peripheral-side region that contacts the attachment ring and an inner peripheral-side region that contacts the seal member. This spatial differentiation allows the outer region to bear assembly loads while the inner region protects the seal member from excessive compression, resolving the contradiction between secure holding and seal integrity.
2Reliability
If the plate parts are positioned to sandwich the seal member, then reliable gas sealing is achieved, but the seal member is excessively compressed during assembly
Solution Approach 1:
The patent introduces the outer peripheral-side region of the first-side plate part as an intermediary load-bearing structure. This intermediary zone absorbs and redirects assembly compression forces away from the seal member, allowing the seal member to maintain reliable gas sealing without suffering excessive compression stress during the assembly process.
3Strength
If the attachment ring is fixed with the second-side plate part contacting the housing, then secure attachment is achieved, but load distribution causes excessive compression on the seal member
Solution Approach 1:
The patent segments the load-bearing function across two distinct zones: the outer peripheral-side region of the first-side plate part that contacts the attachment ring, and the inner peripheral-side region that contacts the seal member. This segmentation allows the attachment ring fixation to achieve secure attachment while the spatial separation prevents compression stress from being transmitted to the seal member.
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 effectively suppresses excessive compression of the seal member during assembly, reducing the risk of seal member rupture and ensuring reliable gas sealing between the rotation shaft and the housing.
Implementation Method 1
The seal member is slidably in close contact with the outer peripheral surface of the rotation shaft
Data Source
AI summary
A valve device includes: a seal member that is slidably in close contact with an outer peripheral surface of a rotation shaft; and an annular attachment ring that attaches the seal member to a housing. The seal member has a first-side plate part and a second-side plate part sandwiching and holding the seal member in an axial direction of the rotation shaft. An inner peripheral end of the second-side plate part is positioned radially outside beyond an inner peripheral end of the first-side plate part. An outer surface of the first-side plate part includes an outer peripheral-side region positioned radially outside beyond the inner peripheral end of the second-side plate part and an inner peripheral-side region positioned radially inside beyond the outer peripheral-side region. The outer peripheral-side region is positioned on a first side of the axial direction with respect to the inner peripheral-side region.