Variable Hardness Polyurethane Filter Endplate
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Solution Overview
Problem
Filtration systems require separate sealing elements for endcaps, which can be cumbersome and inefficient, as existing filter elements rely on rigid endcaps for support and sealing, necessitating additional components for proper installation and sealing within filtration housings.
Innovation Solution
A filter cartridge design featuring endplates with varying hardness, where a harder section supports the filter media and maintains shape, and a softer compressible section provides a sealing surface without the need for additional seal members, formed through a polyurethane molding process with different hardness sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid endcaps are used to support filter media and maintain shape, then structural strength is improved, but separate sealing elements are required increasing device complexity
Solution Approach 1:
The patent combines the structural support function and sealing function into a single endplate component. The endplate includes a rigid portion for structural support and a compressible portion for sealing, eliminating the need for separate sealing elements and reducing device complexity while maintaining structural integrity.
Solution Approach 2:
The endplate features different regions with different properties: a rigid portion with high structural strength for supporting the filter media, and a compressible portion with lower hardness for providing sealing. This local differentiation of material properties allows each region to perform its specific function optimally.
2Reliability
If separate sealing elements are used to ensure proper seal, then sealing reliability is improved, but ease of operation deteriorates due to cumbersome installation
Solution Approach 1:
The sealing function is merged into the endplate itself through the compressible portion, which is integrally formed with the rigid portion. This eliminates the need for separate sealing elements and their associated installation steps, making the filter element easier to install while maintaining reliable sealing through the compressible material's ability to conform to the housing surface.
3Stability of the object's composition
If rigid endcaps are used to maintain filter element shape, then shape stability is improved, but manufacturing complexity increases due to multiple components
Solution Approach 1:
The endplate is manufactured as a single component with locally differentiated properties: a rigid portion for structural support and shape maintenance, and a compressible portion for sealing. This local quality differentiation is achieved through techniques such as co-molding or overmolding, allowing the product to maintain shape stability while simplifying manufacturing by reducing the number of separate components.
Solution Approach 2:
The endplate utilizes composite construction with a rigid portion made from a hard material and a compressible portion made from a softer, elastomeric material. This composite approach allows both shape stability and sealing functionality to be achieved in a single integrated component, simplifying the manufacturing process compared to assembling multiple separate parts.
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 design enhances the integration and sealing efficiency of filter cartridges within filtration systems by eliminating the need for separate seal members, ensuring proper installation and preventing fluid leakage while maintaining the structural integrity of the filter media.
Implementation Method 1
The compressible section is configured to provide a sealing surface between the second endplate and a component of a filtration system
Implementation Method 2
injecting polyurethane into the first section and the second section of the mold to form the endplate. The polyurethane injected into the first section has a first hardness when cured. The polyurethane injected into the second section has a second hardness when cured
Data Source
AI summary
A filter cartridge having an endplate formed of polyurethane having a varying hardness is described. A first portion of the endplate is harder than a second portion of the endplate. The first portion of the endplate helps support the filter media of the filter element and maintain the shape of the filter element. The second, softer portion creates a seal between the filter element and a filter housing when the filter element is installed in the filter housing. The first portion and separate portions may be formed from different types of polyurethane or from the same type of polyurethane having a varying composition as a function of the radial distance of the endplate.