Integrated Core-Shell Gasket for Gas-Tight Electrical Housings
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Solution Overview
Problem
Current sealing systems in electrical devices, primarily relying on vulcanized rubber O-rings, face challenges with gas tightness and require complex assembly processes, which can lead to incorrect installation and reduced sealing effectiveness.
Innovation Solution
The integration of a core-shell gasket using 2K injection molding, where the core is formed from thermoplastic elastomer and the shell from a thermoplastic polymer with high gas barrier properties, providing improved gas tightness and simplified assembly through a sandwich molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vulcanized rubber O-rings are used for sealing, then sealing function is achieved, but assembly complexity increases and gas tightness deteriorates
Solution Approach 1:
The gasket is integrated directly into the housing body through 2K injection molding, merging two previously separate components (housing and gasket) into a single integrated part. This eliminates the need for separate assembly steps, grooves, and handling of standalone O-rings, thereby reducing assembly complexity while maintaining or improving gas tightness through the integrated design.
Solution Approach 2:
The patent employs a core-shell gasket structure where the core is made of thermoplastic elastomer and the shell is made of thermoplastic polymer with high gas barrier properties. This composite material approach allows the gasket to simultaneously achieve flexibility (from the elastomer core) and superior gas tightness (from the barrier polymer shell), resolving the contradiction between sealing effectiveness and assembly simplicity.
2Reliability
If separate seal assembly is used, then sealing function is provided, but manufacturing precision deteriorates due to incorrect installation
Solution Approach 1:
By integrating the gasket directly into the housing body through co-molding, the patent eliminates the separate installation step that is prone to human error. The gasket and housing are manufactured as a single integrated component, ensuring precise positioning and eliminating the risk of incorrect installation, thereby improving both sealing effectiveness and manufacturing precision.
Solution Approach 2:
The gasket is pre-formed and integrated into the housing body during the molding process itself, rather than being installed separately afterward. This preliminary integration ensures that the gasket is perfectly positioned and secured before final assembly, eliminating installation errors and improving manufacturing precision while maintaining sealing effectiveness.
3Adaptability or versatility
If thermoplastic material replaces epoxy resin, then sustainability is improved, but gas barrier properties deteriorate
Solution Approach 1:
The patent uses a composite material approach where the gasket shell is made of thermoplastic polymer with high gas barrier properties, while the core is made of thermoplastic elastomer. This allows the overall assembly to use sustainable thermoplastic materials (replacing epoxy resin) while the specific gas barrier layer maintains superior gas tightness, thus resolving the contradiction between sustainability and gas barrier performance.
Solution Approach 2:
The patent applies different material properties to different parts of the gasket: the shell is made of thermoplastic polymer with high gas barrier properties for gas tightness, while the core is made of thermoplastic elastomer for flexibility. This local differentiation of material quality allows the overall system to be sustainable (thermoplastic) while maintaining superior gas barrier properties where needed.
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 solution enhances gas tightness, simplifies the assembly process by eliminating the need for grooves, reduces component handling, and ensures reliable sealing across various environmental conditions.
Implementation Method 1
the body of the electrical equipment housing element and the shell of the gasket are chemically or chemically-mechanically bonded in 2K injection molding process
Implementation Method 2
the body of the electrical equipment housing element and the shell of the gasket are chemically or chemically-mechanically bonded in 2K injection molding process
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to an electrical equipment housing element with an integrated gasket 3 comprising a body 1 of the electrical equipment housing element and an integrated gasket 3, wherein the gasket 3 is a core-shell gasket having a core 4 formed of thermoplastic elastomer and the shell 5 formed of a thermoplastic polymer having high gas barrier properties. The body 1 of the electrical equipment housing element and the shell of the gasket 3 are integrated in 2K injection molding process.