Filter Element with Active Support for Hydraulic Systems
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Solution Overview
Problem
Filter elements with star-shaped filter folds are prone to deformation and blockage due to high viscosity fluids, leading to reduced filtration surface, increased pressure losses, and shortened service life, especially in hydraulic systems where ageing products in the fluid can cause choking.
Innovation Solution
Incorporating filter-active substances into the support structure, which acts as a particle scavenger to prevent migration of damaging substances and maintain filter fold separation, using materials like bentonite, perlite, activated charcoal, or dual-component fibers to enhance filtration and retention capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If filter material is folded in a star shape to increase filtering surface, then filtering surface area is improved, but filter folds deform and block during filtration of high viscosity fluids
Solution Approach 1:
A support structure acts as an intermediary between the filter folds and the housing, preventing direct contact and deformation of the filter folds while maintaining their star-shaped configuration for increased surface area
Solution Approach 2:
The support structure provides localized support at critical points where filter folds are most prone to deformation, allowing the filter material to maintain its star shape without requiring complete structural reinforcement throughout
2Reliability
If support structure is added to prevent fold deformation, then filter fold stability is improved, but ageing products in fluid cause blockage of the entire filter element
Solution Approach 1:
The support structure is designed to be removable or replaceable, allowing it to be taken out for cleaning or replacement when blocked by ageing products, while the filter element structure remains intact
Solution Approach 2:
The support structure can be discarded after a certain service life when blocked by ageing products, and a new support structure can be installed to extend the overall service life of the filter element
3Area of stationary object
If filter folds are kept separated with support, then filtering surface is maintained, but pressure losses increase due to reduced effective area
Solution Approach 1:
The support structure provides partial support only where needed to prevent fold blockage, rather than completely blocking the flow path, thus maintaining most of the effective filtering surface area while preventing deformation
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 filter-active substances effectively prevent blockage and maintain filter performance by retaining ageing products and other damaging media, ensuring higher dirt holding capacity and extended service life by keeping filter folds separated and clean.
Implementation Method 1
the support has a porous, especially sponge-like basic structure. In the pores of that structure, at least to some extent, filter-active substances, such as bentonite, perlite, activated charcoal, kieselguhr, are enclosed
Implementation Method 2
the support has a porous, especially sponge-like basic structure. In the pores of that structure, at least to some extent, filter-active substances
Data Source
AI summary
A filter element includes a filter material (10) having individual filter folds (12) folded in a star-like manner. At least one fluid-permeable support element (26) extends at least partially in the space between two adjacent filter folds (12) and/or on the inner peripheral side and/or external peripheral side of the filter folds (12). The support element (26) is provided with filter-active substances or is made of filter-active substances. A certain type of filter auxiliary agent can be obtained which is used to reduce influences of fluid components which reduce the service life, in the form of specific ageing products or in the form of other agents which damage the fluid.