Multilayer Diaphragm Elastic Adhesive Layer Pressure Resistance
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Solution Overview
Problem
In high-performance liquid chromatography, increasing the thickness of metallic diaphragms to enhance pressure resistance impairs smooth deformation, making operations at small flow rates difficult, and the lamination method for diaphragms complicates dismantling and washing, leading to variations in lamination conditions.
Innovation Solution
A multi-layer diaphragm is created by adhering metallic plate materials with an elastic layer to maintain pressure resistance while reducing excessive flexural rigidity, allowing for easier dismantling and washing, and incorporating a metallic attachment plate with positioning and biasing features to ensure accurate reassembly and prevent erroneous attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of metallic diaphragm is increased to increase pressure resistance, then pressure resistance is improved, but smooth deformation is impaired making operations at very small flow rate difficult
Solution Approach 1:
The diaphragm is divided into multiple thin layers (first metallic plate, second metallic plate, third metallic plate) instead of using a single thick plate. This segmentation allows the diaphragm to maintain flexibility for smooth deformation while achieving the required pressure resistance through the combined strength of multiple layers. The elastic layer between layers provides additional compliance.
Solution Approach 2:
The diaphragm uses a composite structure combining metallic plates with an elastic layer. This composite material approach allows the metallic layers to provide pressure resistance while the elastic layer maintains flexibility and enables smooth deformation, resolving the contradiction between strength and ease of operation.
2Strength
If multiple thin diaphragm plates are laminated to realize both pressure resistance and operability, then pressure resistance and operability are improved, but dismantling and washing become complicated and lamination condition varies
Solution Approach 1:
The elastic layer is selectively removed from between the first and second metallic plates to create a separation space. This extraction allows the metallic plates to be easily separated for dismantling and washing without requiring complex procedures, while the elastic layer can be reapplied during reassembly to restore the multi-layer structure and lamination conditions.
3Strength
If multiple metallic plate materials are adhered to each other, then pressure resistance is improved, but excessive flexural rigidity occurs
Solution Approach 1:
The elastic layer acts as an intermediary between the metallic plates, allowing them to be adhered together for pressure resistance while providing compliance that prevents excessive flexural rigidity. The elastic layer mediates between the rigid metallic plates, enabling them to move relative to each other and maintain appropriate flexibility.
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 multi-layer diaphragm achieves improved pressure resistance and maintainability, allowing for precise operation at small flow rates with reduced risk of lamination variations and erroneous assembly, thereby enhancing the reliability and efficiency of fluid devices.
Implementation Method 1
the plurality of metallic plate materials are adhered to each other by the elastic layer that possesses elasticity in the direction for displacing the plurality of metallic plate materials relative to each other in the in-plane direction
Data Source
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AI summary
This invention provides a multi-layer diaphragm which is for use in fluid devices and has excellent maintainability in addition to both operability and pressure resistance. This multi-layer diaphragm (180a) is provided with a first and second plate (181, 182) and with an elastic adhesive layer (183) which binds together the first and second metal plates (181, 182). The elastic adhesive layer (183) has an elastic layer that is elastic in a direction which offsets the first and second metal plates (181, 182) from one another in the in-plane direction. The multi-layer diaphragm (180a) is provided with a metal mounting plate which, provided in a position allowing protrusion beyond the first and second metal plates (181, 182) in the outer edge direction, has a mounting unit for mounting to the fluid device.