Annular Seal Assembly With Decoupled Lip Biasing Under Vibration
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Solution Overview
Problem
Existing seals fail to effectively withstand high pressure and vibration conditions due to spring fracture, leading to operational inefficiency over time.
Innovation Solution
A seal assembly featuring an annular jacket with a circumferential spring and floating inserts, where radial biasing forces on the lips are decoupled, reducing stress on the spring and preventing fatigue failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spring is used to provide radial biasing force to both lips, then the seal structure is simpler, but the spring is subjected to repeated compression and stress leading to fracture under high pressure and vibration conditions
Solution Approach 1:
The seal structure is segmented by dividing the single spring system into two independent circumferential springs, each responsible for biasing one lip. This segmentation isolates the stress paths, preventing force transmission from one lip to the other through the spring, thereby eliminating the fracture issue while maintaining structural simplicity
2Volume of moving object
If the radial biasing forces on the first lip and second lip are coupled through a single spring, then the seal assembly is more compact, but the spring experiences fatigue failure over time under high pressure and vibration
Solution Approach 1:
The coupled spring system is segmented into two independent circumferential springs positioned within the annular recess. Each spring independently biases one lip, eliminating fatigue failure from force coupling while maintaining compact arrangement within the annular space
Solution Approach 2:
The floating circumferential insert acts as an intermediary element that decouples the force paths between the two lips. By introducing this intermediate component, the springs are isolated from each other's stress cycles, preventing fatigue failure while maintaining the compact seal assembly structure
3Device complexity
If a single spring biases both lips, then the number of components is reduced, but the seal fails to withstand high pressure and vibration conditions due to spring fracture
Solution Approach 1:
The single spring component is segmented into two independent circumferential springs, each dedicated to biasing one lip. This segmentation allows each spring to independently withstand pressure and vibration without transmitting stress to the other, eliminating fracture while maintaining reasonable component count
Solution Approach 2:
The floating circumferential insert introduces dynamic independence to the force application mechanism. Each spring can dynamically respond to pressure and vibration conditions independently, adapting to varying loads without being constrained by the other lip's movements, thereby enhancing resistance to harmful factors
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 decoupling of radial biasing forces extends the lifespan of the seal components by minimizing repeated compression and stress, enhancing durability under high pressure and vibration conditions.
Implementation Method 1
a circumferential spring disposed within the annular recess adjacent to one of the first lip and the second lip
Data Source
AI summary
A seal including: an annular jacket including a body including a first lip and a second lip defining an annular recess; a circumferential spring disposed within the annular recess adjacent to one of the first lip and the second lip; and a floating circumferential insert, where a radial biasing force on the first lip is decoupled from a radial biasing force on the second lip.