T-shaped PTFE Sealing Ring for Membrane Module Crack Prevention
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Solution Overview
Problem
Membrane modules with tube bundles experience leaks due to thermal stresses and defective or poorly fitting seal rings, leading to costly and cumbersome replacements, as different materials with varying thermal expansion coefficients cause cracks and fractures in the head plate.
Innovation Solution
An additional sealing method is introduced, using a T-shaped sealing ring made of Teflon or PTFE, which is pressed into the gap between the head plate and mounting ring, along with a sealing mass, to seal radial and axial cracks, and optionally filled with quartz sand for enhanced stability, allowing for axial and radial sealing without replacing the O-ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing methods with O-rings and seal rings are used, then the membrane module can be assembled, but thermal stresses cause cracks and fractures in the head plate leading to leaks
Solution Approach 1:
The patent changes the material parameter of the sealing ring from conventional elastomers to PTFE (Teflon), which has superior thermal stability and lower thermal expansion coefficient. This parameter change allows the sealing ring to withstand thermal stresses without deforming or cracking, thereby preventing leaks while maintaining sealing reliability under temperature variations.
Solution Approach 2:
The patent employs a composite sealing structure combining PTFE sealing ring with additional sealing elements (such as sealing strips or sealing masses). This composite approach creates a multi-layer sealing system that can accommodate thermal expansion differences and distribute thermal stresses, preventing crack propagation while maintaining effective sealing.
2Reliability
If seal rings are replaced to fix leaks, then sealing performance can be restored, but the process is cumbersome and expensive
Solution Approach 1:
The patent incorporates redundant sealing elements (additional sealing strips or sealing masses) alongside the main PTFE sealing ring. These additional sealing elements act as a backup system that can compensate for defects or failures in the primary seal, providing beforehand protection against leaks and eliminating the need for complex repair procedures.
Solution Approach 2:
The patent introduces an intermediary sealing structure (sealing strip or sealing mass) that mediates between the head plate and mounting ring. This intermediary element can be independently replaced or adjusted without removing the entire assembly, greatly simplifying repair operations while restoring sealing performance.
3Adaptability or versatility
If different materials with varying thermal expansion coefficients are used, then the membrane module can be constructed, but thermal stresses cause fractures in the head plate
Solution Approach 1:
The patent changes the thermal expansion parameter of the sealing system by selecting PTFE material with a thermal expansion coefficient that better matches the head plate material. This parameter matching reduces differential thermal stress, preventing fractures in the head plate while maintaining the necessary adaptability for constructing the membrane module with different materials.
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 method effectively seals radial and axial cracks, preventing leaks and extending the life of membrane modules by eliminating the need for frequent replacements, while maintaining mechanical and chemical stability across varying temperatures.
Implementation Method 1
a T-shaped sealing ring 4 made of Teflon or PTFE, which is pressed into the gap between the head plate 3 and mounting ring 10
Implementation Method 2
optionally filled with quartz sand for enhanced stability
Data Source
AI summary
A method for sealing a membrane module by introducing a seal or a sealing mass between a head plate holding a tube bundle and a mounting ring holding the head plate. Alternatively, a sealing mass containing quartz sand is proposed for sealing cracks in the head plate.