Fuel Filter Insert Radial Sealing and Carrier Retention
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Solution Overview
Problem
Existing fuel filters face issues with unreliable assembly and sealing of compartments due to potential damage or misformation of locking tabs, leading to leaks and compromised protection of downstream components.
Innovation Solution
A filter insert design that uses a support dome and end plate to secure components without locking hooks, ensuring a robust construction and reliable radial sealing, allowing for manufacturing tolerances to be compensated through a floating bearing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If locking tabs are used to secure the separator in the fuel filter, then the separator can be held in place during assembly, but the locking tabs may be damaged or misformed leading to unreliable sealing and potential leaks between compartments
Solution Approach 1:
The invention removes the locking tabs from the separator and instead uses the support dome with an open top to hold the separator. This extraction of the problematic locking mechanism eliminates the risk of tab damage while maintaining the holding function through the dome's structural support and the end plate's clamping force.
Solution Approach 2:
The support dome acts as an intermediary structure between the end plate and the separator. Instead of directly connecting the end plate to the separator with fragile locking tabs, the dome provides a robust intermediate support that distributes forces and ensures reliable positioning without delicate components.
2Ease of operation
If narrow locking hooks are used to secure components, then the components can be held in place, but the construction becomes mechanically fragile and prone to damage during assembly or operation
Solution Approach 1:
Instead of using narrow hooks that reach outward to secure components, the invention inverts the approach by using the broad, stable support dome that receives and holds the separator from below. The securing force comes from above (end plate clamping) rather than from lateral locking hooks, creating a more robust mechanical structure.
Solution Approach 2:
The support dome functions as a flexible yet robust shell structure that can accommodate manufacturing tolerances and provide continuous support to the separator. Unlike rigid locking hooks, the dome's curved surface distributes stresses and provides mechanical forgiveness while maintaining secure positioning.
3Ease of manufacture
If locking tabs are used to hold the separator, then the separator can be positioned, but the tabs may break during assembly or operation causing consequential damage to downstream components
Solution Approach 1:
The invention provides beforehand protection by eliminating the fragile locking tabs that could break and cause damage. The support dome and end plate configuration creates a cushioning effect where forces are distributed across robust structures rather than concentrated on delicate tabs, preventing breakage before it can occur.
Solution Approach 2:
By removing the locking tabs entirely and replacing them with the support dome structure, the invention extracts the source of potential breakage and consequential damage. The separator is held by the dome's open top and the end plate's clamping force, eliminating the fragile linking elements that could fail.
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 trouble-free assembly and prevents unintended fuel leakage between compartments, maintaining effective filtration performance even under varying operational conditions.
Implementation Method 1
the separator (10), which is designed, for example, by means of a hydrophobic sieve, to separate the water droplets from the fuel
Implementation Method 2
coagulation or agglomeration of small water droplets occurs by means of a coalescer
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
In a filter insert (1) for a fuel filter, wherein the filter insert (1) has a hollow cylindrical filter medium (2) through which a fuel-water mixture can flow radially from the outside to the inside, in the interior of which a fluid-permeable support dome (6) is arranged, and a water-droplet-coagulating coalescer (5) arranged downstream of the filter medium (2) in the flow direction, on the clean side of the filter insert (1), and a separator (10) arranged downstream of the coalescer (5) in the flow direction and separating water out of the fuel-water mixture, wherein the separator (10) is arranged on a carrier (11) which is retained in the filter insert (1) as a separate component, and wherein the filter insert (1) has an end plate (3) with an outlet opening (9) for cleaned fuel and the carrier (11) is arranged within the support dome (6) and is sealingly in contact with an adjacent component, according to the invention, the carrier (11) is sealed radially against the component of the filter insert (1) adjacent to the carrier (11), and the carrier (11) is retained in the direction of the longitudinal axis of the filter medium (2) by the support dome (6) and the end plate (3).