Three-Stage Fuel Filter Insert Assembly Without Latching Hooks
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Solution Overview
Problem
Conventional fuel filters face issues with unreliable assembly and sealing due to manipulable latching devices, which can lead to leaks and damage downstream components, and fail to ensure proper fuel flow paths.
Innovation Solution
A filter insert design that eliminates latching devices by using component contours for support and radial seals, allowing assembly without manipulation and ensuring reliable sealing between filter areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If latching hooks are used to hold the separator in place, then the separator can be securely positioned, but the assembly process becomes complex and unreliable due to manipulation requirements
Solution Approach 1:
The patent removes the latching hooks from the filter insert design, extracting the problematic manipulable holding device. The separator is instead held in place by a simple form-fitting connection where the separator's outer circumference rests on the inner circumference of the support dome, eliminating the need for complex latching mechanisms while maintaining secure positioning and sealing reliability.
2Reliability
If latching hooks are used to secure components, then components can be held together, but the risk of improper latching or damage increases leading to leaks
Solution Approach 1:
By removing the latching hooks entirely, the patent eliminates the source of potential leakage problems. The separator is secured through a passive form-fitting connection that inherently prevents displacement and sealing failures, thereby removing the harmful factor of leak risk associated with manipulated latching devices.
Solution Approach 2:
The separator automatically positions itself correctly through the form-fitting connection with the support dome, eliminating the need for manual manipulation. The design self-secures the separator in place without requiring active latching mechanisms, thereby preventing improper latching and associated leakage risks.
3Ease of manufacture
If latching hooks are used to hold components, then assembly can be performed, but the hooks may become damaged or break off during operation
Solution Approach 1:
The patent eliminates the latching hooks that are prone to damage and failure during operation. The separator is held in place by a durable form-fitting connection between the separator's outer circumference and the support dome's inner circumference, providing a more reliable long-term solution that avoids the service life limitations of manipulable latching devices.
4Device complexity
If bypass channels are provided to connect adjacent spaces, then assembly is simplified, but reliable sealing between filter areas cannot be ensured
Solution Approach 1:
The design enables self-aligning assembly where the separator automatically positions itself through the form-fitting connection with the support dome. This passive positioning mechanism ensures proper alignment and sealing without requiring complex assembly procedures or additional sealing components, thereby achieving both simplified assembly and reliable sealing simultaneously.
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
Facilitates easy assembly and maintains robust mechanical integrity while preventing unintended fuel flow, accommodating manufacturing and assembly tolerances, and ensuring consistent fuel quality for downstream components.
Implementation Method 1
The second stage coalesces fine water droplets into larger drops. This takes place in a coalescer that is provided inside the filter medium.
Implementation Method 2
In the third stage, the coalesced water droplets are separated out by means of a separator that is constructed as a hydrophobic sleeve. Due to their higher density, the coalesced drops of water flow downwards through the fuel and are collected in a water collection chamber
Data Source
AI summary
A filter insert for use in a three-stage fuel filter. The components inside the filter medium include a support dome, a coalescer, a separator that is affixed to a carrier, and an end disc. The support dome, carrier, and end disc are constructed so that, during the process of assembling the various components of the filter insert, these components are held in the proper position to complete the assembly of the filter insert, without the use of latching mechanisms. The carrier either rests directly on a contour of the support dome and/or forms a seal with an adjacent component, be it the support dome or another component that is in contact with the support dome, and in that way provides sufficient holding power to hold at least the support dome and the carrier along with its separator close to the end disc.