Pipe Connection Gasket Structure for Controlled Pull-Out Sealing
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Solution Overview
Problem
Existing connection structures allow both the pipe and gasket to be removed together when the pipe is pulled out, risking fluid leakage and contamination during maintenance.
Innovation Solution
A gasket design with a tubular first holding portion and inner, outer circumferential lip portions is used, where the resistance to pull-out is configured such that only the pipe is removed, with lubrication applied to reduce the resistance on the inner lip portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the pipe is pulled out from the through hole during maintenance, then the pipe can be removed for repair or replacement, but the gasket is also pulled out together with the pipe, causing the through hole to become unsealed and risking fluid leakage and contamination
Solution Approach 1:
The gasket is segmented into multiple functional portions: a first holding portion that retains the pipe, a second holding portion that remains in the through hole, and sealing lips that maintain the seal. This segmentation allows the pipe to be pulled out while the gasket remains divided, with one portion staying to maintain the seal.
Solution Approach 2:
The first holding portion is designed to be extracted (pulled out) with the pipe during maintenance, while the second holding portion remains in the through hole to maintain the seal. This selective extraction allows pipe removal without compromising the sealing function.
2Strength
If the gasket is designed to retain the pipe strongly, then the pipe can be securely held, but the pipe cannot be pulled out during maintenance
Solution Approach 1:
The gasket's retention strength is made dynamic through the resistance configuration. During normal operation, the combined resistance of all lip portions provides strong retention. During maintenance, when sufficient pull-out force is applied, the system transitions to allow the first holding portion to be extracted while the second remains, enabling pipe removal.
Solution Approach 2:
Different portions of the gasket have different resistance characteristics: the first holding portion has lower resistance to allow extraction with the pipe, while the second holding portion and sealing lips maintain higher resistance to preserve the seal. This local differentiation of mechanical properties enables both strong retention and controlled removal.
3Ease of repair
If the resistance on the first holding portion is reduced to allow pipe pull-out, then the pipe can be removed during maintenance, but the sealing function may be compromised
Solution Approach 1:
The sealing function is segmented between two distinct portions: the first holding portion with reduced resistance for pipe extraction, and the second holding portion with maintained sealing capability. This segmentation ensures that reducing resistance in one area does not compromise the sealing function in another area.
Solution Approach 2:
The second holding portion acts as an intermediary that remains in the through hole to maintain the seal while the first holding portion is extracted with the pipe. This intermediary element ensures continuous sealing during the pipe removal process.
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
Ensures only the pipe is pulled out during maintenance, maintaining seal integrity and preventing fluid leakage and contamination, while facilitating easy assembly and disassembly.
Implementation Method 1
an inner circumferential first lip portion provided on an inner circumferential surface of the first holding portion and elastically contacting an outer circumferential surface of the first pipe
Implementation Method 2
an outer circumferential lip portion provided on an outer circumferential surface of the first holding portion and elastically contacting an inner circumferential surface of the through hole
Implementation Method 3
an inner circumferential second lip portion provided on an inner circumferential surface of the second holding portion and elastically contacting an outer circumferential surface of the second pipe
Implementation Method 4
lubricant can be applied on an elastic contact region of the inner circumferential first lip portion with the outer circumferential surface of the first pipe
Data Source
AI summary
In a connection structure of a pipe in which a first pipe provided outside a case and a second pipe provided inside the case are connected via a gasket while sealing a space between the first pipe and a through hole provided on a wall body of the case and a space between the through hole and the second pipe, the gasket has a tubular first holding portion, an inner circumferential first lip portion, an outer circumferential lip portion, a tubular second holding portion, and an inner circumferential second lip portion. Resistance applied on the first holding portion including the inner circumferential first lip portion when the first pipe is pulled out of the through hole is smaller than total of resistance generated in the outer circumferential lip portion against pull-out direction and resistance generated in the inner circumferential second lip portion against pull-out direction.