Pipeline Junction Seal With Pressure-Reinforced Flexible Lip
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Solution Overview
Problem
Achieving a good seal at junctions between main pipelines and lateral pipelines in sewer systems is challenging, particularly due to environmental concerns and the limited longevity of existing hydrophilic sealants.
Innovation Solution
A seal comprising a flexible material with a lip that changes state from a relaxed position to a biased position when external force is applied, enhancing the sealing effect by reinforcing the seal with fluid pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrophilic sealant is used to seal the junction, then the seal expands in contact with water to improve sealing, but the sealant degrades over time when repeatedly dried and wetted, reducing reliability
Solution Approach 1:
The patent changes the fundamental parameter of the sealing mechanism from hydrophilic expansion to elastic deformation. The seal is made of elastomeric material that relies on elastic recovery rather than hydrophilic expansion, making it immune to degradation from repeated wetting and drying cycles while maintaining reliable sealing over time.
Solution Approach 2:
The patent replaces the degradable hydrophilic sealant with a durable elastomeric seal that does not rely on temporary expansion mechanisms. The elastomeric material provides long-term service life without degradation from environmental exposure, effectively replacing short-lived sealants with long-lasting components.
2Reliability
If traditional seal is used without pressure reinforcement, then the seal structure is simple, but leakage occurs under varying fluid pressures, reducing sealing effectiveness
Solution Approach 1:
The seal utilizes the fluid pressure itself to enhance its sealing capability. The elastomeric lip is designed to be pressed against the sewer system wall by the fluid pressure, creating a self-reinforcing sealing mechanism where the operating condition (fluid pressure) directly improves the sealing effectiveness without requiring additional active components.
Solution Approach 2:
The seal transitions from a static sealing structure to a dynamic one where the elastomeric lip adjusts its sealing force in response to fluid pressure variations. The lip flexes and conforms to the interface geometry, with the degree of deformation and sealing force automatically adjusting to match the operating pressure conditions.
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 seal effectively reduces the risk of leakage by maintaining a strong seal even under varying fluid pressures and environmental conditions, ensuring long-term reliability and environmental safety.
Implementation Method 1
a lip protruding from said seal base, said lip comprising a flexible material such as an elastic or a compressible material such as rubber or silicone, said lip being in a first state when no external force is exerted on said seal, and said lip being in a second state when external force is exerted on said seal
Implementation Method 2
such that pressure exerted on said seal by a fluid flowing from outside or inside said sewer system reinforces the sealing during intended operational use of said seal
Data Source
AI summary
A seal comprising:—a seal base (210) having a first side (211) for facing a sewer system, and a second side (212) opposite said first side for facing a repair assembly, said seal base having a seal opening, a lip (250) protruding from said seal base (210), said lip comprising a flexible material, said lip being in a first state when no external force is exerted on said seal, and said lip being in a second state when external force is exerted on said seal, such that pressure exerted on said seal by a fluid flowing from outside or inside said sewer system reinforces the sealing during intended operational use of said seal.