Filter Device Electrostatic Discharge Track Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of refined oil and hydraulic media in technical systems leads to electrostatic charging during filtration, causing damage due to voltage peaks and reduced filter element lifespan, as charge carriers cannot be discharged effectively in low conductivity media.
Innovation Solution
A filter device with a discharge device having a discharge track that contacts the support tube and filter medium, forming large contact surfaces for efficient charge transport, and an integral conductive layer within the filter medium to prevent electrostatic charging, where the discharge path is protected and securely connected to ensure reliable grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharge device with a discharge track is provided to remove electrostatic charges, then electrostatic damage is prevented, but the discharge track may be damaged during installation and operation, impairing its conductivity
Solution Approach 1:
The discharge track is designed as a flexible strip that can be deformed and bent without damage. This flexibility allows the discharge track to adapt to installation conditions and resist mechanical damage during handling and installation, while maintaining its electrical conductivity for charge removal
Solution Approach 2:
The discharge track is pre-connected to the filter element in a protected state during manufacturing, with connection points positioned to avoid damage during subsequent installation. The track is designed to make contact with grounding surfaces only when properly installed, preventing premature or damaged connections
2Reliability
If the discharge track protrudes over the contour of the filter element to ensure contact with grounding surfaces, then charge removal is enabled, but the contact surface area is reduced
Solution Approach 1:
The discharge track extends in the longitudinal direction of the filter element rather than only radially outward, creating additional contact surface area along the length of the track. This dimensional extension allows sufficient grounding contact without requiring large radial protrusion that would interfere with housing features
3Strength
If laser transmission welding is used to connect discharge track to filter element, then strong connection is achieved, but the discharge track conductivity may be impaired by melting damage
Solution Approach 1:
The welding parameters (laser power, pulse duration, focal position) are optimized to achieve strong mechanical connection while maintaining the electrical conductivity of the discharge track. The flexible strip material properties are selected to withstand welding heat without compromising conductivity
Solution Approach 2:
A conductive adhesive or intermediate layer may be used between the discharge track and the filter element support structure, providing both mechanical bonding strength and electrical conductivity pathway, avoiding direct laser welding of the thin discharge track material
4Object-affected harmful factors
If refined oil and hydraulic media are used to meet environmental requirements, then environmental compliance is achieved, but electrostatic charging occurs due to low conductivity
Solution Approach 1:
The low conductivity of refined oils, which causes charge accumulation, is addressed by introducing a dedicated conductive discharge track structure. The discharge track converts the harmful charge accumulation into a controlled discharge pathway, allowing the use of environmentally friendly refined oils while preventing electrostatic damage through active charge removal
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
Prevents detectable electrostatic charging during filtration, reduces the risk of damage to filter components, and extends the lifespan of filter elements by ensuring effective charge removal and grounding.
Implementation Method 1
an electrically conductive discharge device which protrudes with at least one discharge track over the contour of the filter medium
Implementation Method 2
a tubular filter medium that is supported on at least one support tube and extends with its opposite end faces between two cap-like termination points
Data Source
Figure 1
Figure 2
Figure 3
AI summary
1. Filter device 2. A filter device with a filter element (10) that can be received at least partially in a housing (12), which has a tubular filter medium (18) that is supported on at least one support tube (20) and extends with its opposite end faces between two cap-like termination points (22, 24), which is permeable to a fluid to be cleaned during operation and separates two fluid spaces (26, 28) from each other with its inner and outer circumference, and which has an electrically conductive discharge device that projects with at least one discharge path beyond the contour of the filter medium (18), is characterized in that the discharge device with its respective discharge path is arranged between the end faces of the filter medium (18) on the outer and/or inner circumference thereof and that the discharge path runs between the respective associated support tube (20) and the filter medium (18).