Elastic Seal Lip With Constant Cross-Sectional Width
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Solution Overview
Problem
Conventional spring energized seals experience increased friction and wear due to the gradual increase in sealing surface area as the seal lip wears, leading to undesirable effects such as increased wear, temperature, and resistance to rotation or reciprocation, which can result in mechanical system failure.
Innovation Solution
The seal assembly features a seal lip with an extended portion and a spring energizer within a groove, maintaining a generally constant cross-sectional width to minimize friction variation, ensuring a consistent seal lip wear rate, sealing surface temperature, and resistance load by positioning the spring coils to contact tapered surfaces of the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seal lip protrudes from the seal body and extends towards the dynamic member surface, then the seal can initially contact the dynamic member to provide sealing, but as the seal lip wears the sealing surface area increases which causes increased friction and wear
Solution Approach 1:
The patent changes the geometric parameters of the seal lip by providing it with a substantially constant cross-sectional width rather than the conventional tapered geometry. This parameter change ensures that as the seal lip wears, the sealing surface area remains substantially constant, thereby maintaining consistent friction and wear characteristics throughout the seal's service life.
Solution Approach 2:
The patent incorporates a spring energizer that dynamically adjusts the sealing force applied by the seal lip to the dynamic member. This dynamic mechanism compensates for wear and maintains optimal sealing pressure, ensuring consistent sealing effectiveness while controlling friction and wear over time.
2Reliability
If the sealing surface area of the seal lip increases with wear, then the seal maintains contact with the dynamic member, but the friction increases leading to increased temperature and resistance to rotation or reciprocation
Solution Approach 1:
The patent changes the geometric parameters of the seal lip by providing it with a substantially constant cross-sectional width rather than the conventional tapered geometry. This parameter change ensures that as the seal lip wears, the sealing surface area remains substantially constant, thereby maintaining consistent friction and wear characteristics throughout the seal's service life.
3Reliability
If the seal lip geometry increases sealing surface area with wear, then initial sealing is achieved, but the resistance to rotation or reciprocation of the dynamic member increases over time
Solution Approach 1:
The patent changes the geometric parameters of the seal lip by providing it with a substantially constant cross-sectional width rather than the conventional tapered geometry. This parameter change ensures that as the seal lip wears, the sealing surface area remains substantially constant, thereby maintaining consistent friction and wear characteristics throughout the seal's service life.
Solution Approach 2:
The patent incorporates a spring energizer that dynamically adjusts the sealing force applied by the seal lip to the dynamic member. This dynamic mechanism compensates for wear and maintains optimal sealing pressure, ensuring consistent sealing effectiveness while controlling friction and wear over time.
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 maintains a constant seal lip wear rate, sealing surface temperature, and resistance load, reducing the risk of mechanical failure by minimizing friction variation and maintaining optimal performance throughout the seal's lifespan.
Implementation Method 1
a spring energizer within the groove biasing the seal lip towards a dynamic surface to be sealed thereagainst
Data Source
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AI summary
Seal assemblies (100) and methods that include a seal lip (114) that comprises an extended portion with generally constant cross-sectional width for low and generally constant friction during wear are described. The seal lip is loaded against a dynamic member (116) by the aid of a spring energizer (112). The extended portion of the seal lip maintains constant torque resistance during movement of the dynamic member.