Grounded Fuel Filter Element for Electrostatic Discharge Prevention
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Solution Overview
Problem
Existing fuel and oil filters experience electrostatic discharges due to charge accumulation in the filtering element, leading to electrical faults, burns, and potential explosions, especially when flammable vapors are present, and current antistatic solutions are scarce, expensive, and not universally compatible.
Innovation Solution
A fuel and oil filter design that includes a filtering element made of pleated paper impregnated with phenolic resin, grounded through an electrical contact lamina made of conducting material, ensuring electrical connection to the outer casing, which dissipates electrical charges via the ground, preventing charge accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antistatic papers are used to prevent charge accumulation, then electrical safety is improved, but cost and availability deteriorate
Solution Approach 1:
The patent replaces expensive antistatic papers with a simple, inexpensive metallic layer applied to the filtering element. This metallic layer can be easily applied using common manufacturing techniques like electroplating or painting, making the solution both cheap and widely manufacturable by any filter company.
Solution Approach 2:
The patent changes the electrical parameter of the filtering element by applying a conductive coating. This transforms the filtering element from being electrically insulating to being electrically conducting, allowing it to dissipate static charges without requiring special antistatic materials.
2Productivity
If conventional filtering elements are used, then filtration function is maintained, but electrical safety deteriorates due to charge accumulation
Solution Approach 1:
The patent creates a composite structure by combining the conventional filtering material with a conductive metallic layer. This composite element maintains the filtration capabilities of the original material while adding the electrical conductivity needed for safety, allowing the filtering element to serve dual functions.
Solution Approach 2:
The metallic layer acts as an intermediary between the filtering element and the ground. It provides a conductive path that allows electrical charges to dissipate from the filtering element to the ground, preventing charge accumulation without interfering with the filtration function.
3Ease of manufacture
If the filtering element is electrically insulated from the casing, then manufacturing is simplified, but electrical safety deteriorates
Solution Approach 1:
The metallic layer serves as an intermediary that provides both electrical insulation and conductivity. It insulates the filtering element from the casing during assembly while simultaneously providing a conductive path to ground through connection means, resolving the contradiction between insulation and safety.
Solution Approach 2:
The metallic layer performs multiple functions simultaneously: it provides electrical conductivity for charge dissipation, acts as a structural coating on the filtering element, and serves as an intermediary between the filtering element and the casing. This multi-functionality eliminates the need for separate insulation and grounding 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
Prevents electrical faults and ensures safe operation in potentially explosive environments by effectively grounding the filtering element, using commonly available materials and reducing manufacturing costs.
Implementation Method 1
an electrical contact lamina (10) made of electrically conducting material, such as for example copper... which allow the filtering element (6) to be grounded, so as to bring it to the same electrical potential as the ground
Implementation Method 2
The flow of the fluid to be filtered through the filtering element causes the formation of electrical charge accumulations in the filtering element due to the triboelectric effect
Implementation Method 3
an adhesive layer made of electrically nonconducting resin, which in practice causes the electrical insulation of the filtering element with respect to the end caps
Data Source
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AI summary
A filter (1)for fuels and oils which comprises a substantially cylindrical outer casing (2), which forms internally a filtration chamber (3) provided with at least one inlet (4) and at least one outlet (5) for the fluid to be filtered; the filtration chamber (3) accommodates at least one filtering element (6) arranged around an inner supporting sleeve (7) arranged substantially coaxially to the outer casing (2); means (9) being provided for electrically connecting the filtering element (6) to the ground.