Radial Flow Water Filter Cartridge Reducing Axial Ejection Force
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Solution Overview
Problem
Current water filter cartridge systems face challenges with axial force issues due to water pressure, leading to leakage and contamination risks, and require larger lugs and locking surfaces, which increase manufacturing costs and limit filter size, while also making cartridge installation and removal difficult for users with weaker arm strength.
Innovation Solution
A manifold head with a barrel valve and filter cap configuration that uses radial flow paths and opposing seals to reduce axial force, allowing for thinner lugs and easier engagement, and includes vent passages for leak testing with pressurized gas to ensure seal integrity and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If larger diameter filter cartridges are used, then filtering capacity is improved, but axial force pushing the cartridge away from the manifold head increases
Solution Approach 1:
The patent changes the flow path orientation from axial to radial. By directing water flow radially through the filter cartridge rather than axially, the pressure force acts perpendicular to the cartridge's longitudinal axis, eliminating the axial ejection force that pushes the cartridge away from the manifold head. This dimensional change in flow direction resolves the contradiction by allowing larger diameter cartridges without increasing axial force.
2Strength
If thicker lugs and locking surfaces are used, then cartridge retention is improved, but manufacturing cost and material usage increase
Solution Approach 1:
By changing the flow path to radial orientation, the patent eliminates the axial force that necessitates thick lugs and locking surfaces. Since the water pressure no longer acts axially to eject the cartridge, smaller and simpler lugs suffice to provide adequate retention, reducing molding complexity and material usage while maintaining cartridge security.
3Strength
If larger lugs are used, then cartridge retention is improved, but ease of installation and removal deteriorates
Solution Approach 1:
The radial flow path configuration eliminates the need for large, cumbersome lugs by removing the axial ejection force. This allows the design of smaller, more maneuverable lugs that are easier for users with weaker arm strength to engage and disengage, while still providing sufficient retention strength to hold the cartridge firmly in place during operation.
Data Source
AI summary
A water filter cartridge has a cap with radially oriented first and second (either inlet or outlet) flow channels on first and second generally cylindrical portions. First and second seals encircle the first flow channel on the first portion and third and fourth seals encircle the second flow channel on the second portion. The second and third seals form a void volume during use which may be accessed by a vent path to eliminate moisture or to test for or indicate leaks. The radial flow paths reduce axial, push out forces on the filter cartridge and allow smaller locking tabs to be used. The first seal forms a top void volume during use which may be accessed by a vent path to eliminate moisture or to test for or indicate leaks.