Filter Element Electrostatic Dissipation for Hydraulic Reliability
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Solution Overview
Problem
Conventional filter elements in hydraulic systems face issues with operating reliability and beta value stability at high flow rates, leading to potential deformations and electrostatic discharges due to differential fluid pressure and triboelectric effects, which can cause damage and safety hazards.
Innovation Solution
Incorporating conductive contact-making means, such as contact pins or dissipative end caps, to dissipate electrostatic charges to a ground point, preventing voltage peaks and spark discharges, while maintaining structural integrity and filtration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional filter elements are used in hydraulic systems, then they can perform basic filtration, but operating reliability and beta value stability deteriorate at high flow rates due to deformations and damage from differential fluid pressure
Solution Approach 1:
The filter medium is divided into multiple folds arranged in a specific sequence, where each fold is followed by a fold with a radially inside fold back located at a distance from the inner support tube. This segmentation of the filter medium into alternating fold patterns distributes the mechanical stress more evenly throughout the structure, preventing localized deformations and maintaining stability at high flow rates.
Solution Approach 2:
The filter element incorporates a support tube made of plastic material with specific local properties (perforations, length exceeding filter medium) positioned at critical locations to provide localized support. The end caps are also designed with specific local features to distribute and mitigate differential fluid pressure, thereby maintaining structural integrity and preventing buckling of folds under high flow conditions.
2Object-affected harmful factors
If insulating layers are introduced between filter medium and end caps, then electrostatic charging is reduced, but electrostatic discharges can still occur due to potential differences between filter element parts
Solution Approach 1:
A conductive contact-making means is introduced as an intermediary element between the insulating end caps and the filter medium. This intermediary provides a controlled electrical connection that allows electrostatic charges to dissipate safely to ground through the end caps, preventing dangerous electrostatic discharges while maintaining the insulating properties of the end caps for other purposes.
3Strength
If cement is used to cement filter medium to end caps, then structural stability is improved, but electrostatic charge dissipation is hindered due to insulating properties of the cement
Solution Approach 1:
The conductive contact-making means serves as an intermediary that bridges the insulating cement layer between the end cap and filter medium. This intermediary element penetrates or bypasses the cement's insulating barrier to provide a conductive path for electrostatic charge dissipation, allowing both the structural bonding function of the cement and the electrical dissipation function to coexist.
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 high operating reliability and beta value stability, preventing electrostatic discharges and maintaining filtration performance even at high flow rates, thereby enhancing the safety and durability of the filter elements.
Implementation Method 1
Incorporating conductive contact-making means, such as contact pins or dissipative end caps, to dissipate electrostatic charges to a ground point, preventing voltage peaks and spark discharges
Implementation Method 2
Generally the dirty fluid flows through it in one direction (often in general from the outside to the inside), with the dirty components remaining in the filter medium
Data Source
AI summary
A filter element includes a filter medium (10) extending between two end caps (12, 14) that are respectively connected to an associable end region (16, 18) of the filter medium (10). The filter medium is supported at least on one side on a supporting tube (20). At least one of the end caps (14) and/or at least one end region (16, 18) of the filter medium (10) has a contacting device (22) and/or the respective end cap (14) itself or its parts are embodied in such a way as to derive the electrostatic charges, especially occurring during the operation of the filter element to ensure that the charge generated on the filter medium (Meshpack) by tribo-electrical effects can escape towards a mass point or a mass site via the contacting device (22) or the respective end cap (14).