Secondary Filter Element Support Against Backwash Pressure Pulses
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Solution Overview
Problem
Existing filter systems for self-cleaning intake air filters in motors face challenges in maintaining robustness and cost-efficiency, particularly in preventing damage to filter media due to pressure pulses during back-washing, which can cause bulging and cracking.
Innovation Solution
A secondary filter element with a support element covering the inflow side of the filter medium, made of a plastic material like high-density polyethylene, stabilizes the filter medium against pressure pulses by minimizing bulging and cracking, while maintaining permeability and preventing excessive pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a secondary filter element is used in a filter system with self-cleaning action, then the filter system can be purged by introducing a purging medium through the outflow socket, but the pressure pulse may cause the filter medium to bulge and become damaged
Solution Approach 1:
A support element is introduced at the inflow side of the secondary filter element to provide beforehand cushioning against the pressure pulse from the purging medium. This support element prevents the filter medium from bulging and becoming damaged during the self-cleaning operation, while still allowing the purging capability to function.
2Loss of energy
If the filter medium is made thin to reduce pressure loss, then filtration efficiency improves, but the filter medium becomes more susceptible to damage from pressure pulses
Solution Approach 1:
The filter element is segmented into two functional layers: a thin filter medium for efficient filtration with minimal pressure loss, and a separate support element for mechanical strength and pressure pulse resistance. This segmentation allows each layer to optimize its specific function without compromise.
Solution Approach 2:
The secondary filter element combines two different materials or structures: the filter medium and the support element. This composite structure provides both the filtration capability of the thin medium and the mechanical protection of the support element, resolving the contradiction between thinness for low pressure loss and strength for pressure pulse resistance.
3Reliability
If a support element is added to protect the filter medium, then filter medium durability improves, but device complexity increases
Solution Approach 1:
The support element and filter medium are merged into a single integrated secondary filter element assembly. This combining approach protects the filter medium while maintaining a compact, unified structure that does not significantly increase overall device complexity.
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 solution enhances the durability of the filter medium, reduces the risk of damage, and maintains efficient filtration performance by stabilizing the filter medium with a support element, ensuring minimal pressure loss and cost-effective operation.
Implementation Method 1
the filter medium is covered by a support element at the intended inflow side... stabilizes the filter medium against pressure pulses by minimizing bulging and cracking
Implementation Method 2
a filter medium which is flowed through by the fluid from an inflow side to an outflow side
Implementation Method 3
a purging medium is introduced under pressure into the inwardly positioned flow chamber, whereupon the deposits at the outer side of the filter body are detached due to the pressure pulse of the purging medium
Data Source
AI summary
A secondary filter element for a filter system for filtering a gaseous fluid, in particular for a self-cleaning intake air filter system of a motor, has a filter medium which in the intended operation is flowed through by the fluid from an intended inflow side to an intended outflow side. The secondary filter element has a support element covering the filter medium at the intended inflow side. A filter system with such a secondary filter element is provided.