Scroll Fluid Machine Seal Member Plural Linear Cut Arrangement
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Solution Overview
Problem
Conventional scroll fluid machines face challenges in maintaining effective sealing, particularly when the sealing member is worn, due to issues with pressure differences between compression chambers, leading to increased leakage and reduced airtightness.
Innovation Solution
The scroll fluid machine incorporates a sealing member with plural linear cuts on its surface, where the angle of the cuts is designed to reduce the rigidity of both the leading and base ends of the lips, allowing for enhanced extension and contact with the tooth bottom land, thereby improving sealing capability regardless of pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single linear cut is made in the sealing member to form a lip, then the lip can extend to contact the tooth bottom land, but the base end of the lip remains too rigid to extend effectively when the sealing member is worn
Solution Approach 1:
The sealing member is divided into multiple segments through plural linear cuts that create separate lips. Each lip can extend independently, and the segmentation allows the base end to have reduced rigidity while maintaining sealing effectiveness. The cuts create discrete lips rather than a continuous structure, enabling localized flexibility where needed.
Solution Approach 2:
The lip structure is designed with non-uniform thickness, where the base end has reduced rigidity compared to the leading end. This local variation in mechanical properties allows the base end to extend effectively when the sealing member is worn, while the leading end maintains sufficient strength for sealing contact.
2Length of moving object
If the sealing member is designed with high rigidity to maintain structural integrity, then the lip cannot extend sufficiently to contact the tooth bottom land when worn, but if the rigidity is reduced, the structural integrity is compromised
Solution Approach 1:
By cutting the sealing member into multiple lips, the structure gains localized flexibility at the base end while maintaining overall structural integrity. The segmentation allows each lip to extend independently without compromising the strength of the entire sealing member.
Solution Approach 2:
The sealing member exhibits spatially varying mechanical properties, with the lip base end having lower rigidity for extension while other portions maintain higher rigidity for structural support. This local quality differentiation resolves the contradiction between extension capability and structural integrity.
3Reliability
If conventional sealing members are used, then sealing effectiveness degrades when the sealing member is worn or under varying pressure differences, but modifying the lip structure adds complexity to the sealing member design
Solution Approach 1:
The sealing member is segmented into multiple lips through linear cuts, creating a structure that adapts to wear and pressure variations. This segmentation provides improved sealing reliability under varying conditions while adding minimal complexity compared to conventional single-structure seals.
Data Source
AI summary
To provide a higher sealing capability irrespective of the pressure difference between compression chambers, lips having leading ends extended toward the inner surface of a recessed groove are formed. At least some of the lips have a base end that is shaped to reduce rigidity against extension of the lips.