Nested Dual-Media Filter Element for Bypass-Free Sequential Filtration
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Solution Overview
Problem
Fuel cell systems require particle and gas filtration with filter medium bodies of varying dimensions, leading to inefficiencies and potential bypass issues, which are not adequately addressed by existing technologies.
Innovation Solution
A filter element comprising at least two filter medium bodies, where one is arranged radially inside the other with a fluid-impermeable casing, ensuring sequential flow through both bodies, with one as a particle filter and the other as an adsorption filter, supported by a frame element that allows partial fluid permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple filter medium bodies of different dimensions are used for particle and gas filtration, then filtration performance is improved, but bypass issues occur and device complexity increases
Solution Approach 1:
The inner filter medium body is nested within the outer filter medium body, with the inner body having a smaller outer diameter than the inner diameter of the outer body. This nested arrangement allows both filter medium bodies to be integrated in a compact configuration, improving filtration performance while avoiding bypass issues and reducing overall device complexity
Solution Approach 2:
The filter element is segmented into multiple filter medium bodies (inner and outer) with different dimensions and functions. The particle filter and adsorption filter are separated into distinct segments that can be independently optimized, yet work together as an integrated system to achieve comprehensive filtration
2Reliability
If filter medium bodies are arranged concentrically to prevent bypass, then filtration reliability is improved, but pressure loss increases
Solution Approach 1:
The frame element is designed with spatially varying properties: it provides structural support where needed while maintaining fluid permeability in specific regions. This allows the concentric arrangement to prevent bypass without uniformly increasing resistance across the entire filter element, thus managing pressure loss
3Reliability
If a fluid-impermeable casing is added to close outer wall surfaces, then bypass prevention is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The casing is merged with the frame element to form an integrated structure. The frame element simultaneously provides structural support, positioning for the filter medium bodies, and fluid-impermeable closure where needed. This integration prevents bypass while simplifying manufacturing by reducing the number of separate components
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
Ensures efficient filtration by preventing bypass, optimizing adsorption capacity, dust capacity, and reducing pressure loss while allowing flexible arrangement and extended service life of high-performance filters based on environmental conditions.
Implementation Method 1
one of the at least two filter medium bodies is configured as a particle filter
Implementation Method 2
another one of the at least two filter medium bodies is embodied as an adsorption filter
Data Source
AI summary
A filter element for filtering a fluid has two or more axially extending filter medium bodies arranged to be sequentially flowed through radially and including a first and a second filter medium body. The first filter medium body has an outer diameter smaller than an inner diameter of the second filter medium body, is arranged radially inside the second filter medium body, and has a section projecting axially away from the second filter medium body. A casing is arranged at an outer wall surface of the projecting section and extends at least partially circumferentially around the outer wall surface. The casing fluid-impermeably closes at least temporarily the outer wall surface. The first filter medium body is a particle filter and the second filter medium body is an adsorption filter, or vice versa. A filter system is provided with such a filter element for filtering a fluid.