Fuel Filter Venting Arrangement for Rapid Pressure Buildup
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Solution Overview
Problem
Existing filter elements for liquid media, particularly fuel, face challenges in achieving quick pressure buildup on the post-filtration side due to air collection, which is disadvantageous in motor vehicles with internal combustion engines and automatic start-stop operations.
Innovation Solution
The filter element incorporates a venting arrangement with a vent tube that allows for venting on both the pre-filtration and post-filtration sides, featuring capillary channels and a siphon to facilitate quick air and liquid medium discharge, ensuring rapid pressure buildup by preventing air backflow and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If air is allowed to collect on the post-filtration side during filter operation, then the filter element can maintain its structural integrity, but pressure buildup of the filtered liquid medium is difficult or delayed
Solution Approach 1:
The venting arrangement is segmented into multiple functional components: a vent tube with inlet and outlet openings, first and second vent channels separated by the filter medium, and a siphon structure. This segmentation allows independent optimization of each component for its specific function while maintaining overall system integrity.
Solution Approach 2:
The siphon acts as an intermediary mechanism between the vent channels and the external environment. It mediates the discharge of air and liquid medium by utilizing gravity and pressure differential, allowing quick venting without requiring additional active components.
2Speed
If a venting arrangement is added to enable quick pressure buildup, then pressure buildup speed is improved, but device complexity increases
Solution Approach 1:
The vent tube is merged with the end plate to form an integrated component, reducing the number of separate parts. The vent channels are formed within the end plate structure itself, combining the housing and venting functions into a single component.
Solution Approach 2:
The vent tube serves multiple functions: it provides a pathway for air discharge, connects to the vent stub on the filter housing, and works with the siphon to enable liquid medium venting. The siphon structure simultaneously handles both air and liquid discharge functions.
3Ease of manufacture
If the vent tube is made in one piece and fastened to the element, then manufacturing simplicity is improved, but flexibility in installation is reduced
Solution Approach 1:
The vent tube is pre-formed as a single piece with the required geometry and connections, eliminating the need for on-site assembly or bending operations. This preliminary formation of the complex geometry simplifies the installation process despite reducing manufacturing flexibility.
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
This design enables quick pressure buildup of the liquid medium on the post-filtration side, ensuring timely and sufficient pressure and flow for use, particularly beneficial in fuel filtration systems of motor vehicles with automatic start-stop operations.
Implementation Method 1
The filter element has a siphon which is delimited in the radial direction externally by the tube stub and in the radial direction internally by the vent tube
Implementation Method 2
The first vent channel and the second vent channel are configured in each case at least partially as capillary channels
Data Source
AI summary
A filter element (10) for a liquid medium, in particular fuel, having a first vent channel (60) connected at the intake end to the pre-filtration side (26) of the filter element (10), a second vent channel (66) connected at the intake end to the post-filtration side (28) of the filter element (10); and a vent tube (32) having has at one end an inlet opening (34) and at the other end an outlet opening for fluidic connection of the vent tube (32) to a vent stub of a filter housing, or a vent tube portion for connection to a vent tube of a filter housing.