Fuel Filter Element Air Duct Layout for Stable Pressure and Exhaust
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Solution Overview
Problem
Existing fuel filter elements suffer from unstable fuel supply pressure, unstable exhaust state, and low filtration precision due to the pulsating impact of fuel pressure on the exhaust channel, damage from pressure pulses, and inadequate secondary filtration.
Innovation Solution
The fuel filter element features an air duct on the outer side of the filter medium, communicating with channels to buffer fuel pressure, and a secondary filtering element with a porous support frame and filtering layer to enhance filtration precision and stability, while maintaining a stable exhaust state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exhaust channel is arranged in the center of the filter element, then the exhaust function is provided, but the pulsating impact of fuel feeding pressure directly acts on the exhaust channel causing unstable fuel supply pressure and damaged hermetical connection
Solution Approach 1:
The exhaust channel is moved from the center (one-dimensional arrangement) to the outer side of the filter element (radial/outer dimensional arrangement). This spatial repositioning allows the filter medium to interpose between the fuel feeding position and the exhaust channel, buffering the pulsating pressure and protecting the exhaust channel's hermetical connection while maintaining exhaust functionality.
2Manufacturing precision
If only a single filter medium is used, then the structure is simple, but the filtration precision is relatively low and filtered fuel contains impurities
Solution Approach 1:
The filtration system is segmented into two distinct filtering elements: a first filter medium for crude filtration and a second filter medium for precision filtration. This segmentation allows each filter to specialize in different filtration tasks, achieving high overall filtration precision while keeping individual filter structures relatively simple and manageable.
Solution Approach 2:
Different regions of the filter element are assigned different filtration qualities. The first filter medium (outer annular region) provides coarse filtration with larger pore structures, while the second filter medium (inner region) provides fine filtration with smaller pore structures. This local differentiation of filtration quality optimizes both precision and structural efficiency.
3Reliability
If the air duct is arranged on the inner side of the filter medium, then the exhaust channel is protected, but the pulsating pressure of fuel feeding cannot be buffered and gas separation is affected
Solution Approach 1:
The air duct is positioned in the outer region of the filter element, radially outward from the fuel feeding position. This dimensional arrangement allows the filter medium to naturally buffer pulsating pressure before it reaches the exhaust channel, while the air duct's outer positioning ensures it does not interfere with the gas separation process occurring in the fuel flow path.
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
The design improves fuel supply pressure stability, enhances filtration precision, and ensures reliable gas separation and exhaust performance by buffering fuel pressure and incorporating a secondary filtering element.
Implementation Method 1
a filter medium surrounding the support tube... to filter out debris in fuel
Implementation Method 2
a secondary filtering element is annularly arranged outside the filter medium, and the secondary filtering element includes a porous support frame and a filtering layer
Data Source
AI summary
The present application relates to the field of fuel filter components of internal combustion engines, and discloses a fuel filter element, including a support tube, a filter medium, and an upper cover plate and a lower cover plate. The upper cover plate is provided with a first channel. The lower cover plate is provided with a second channel. An air duct is arranged between the upper cover plate and the lower cover plate. The air duct communicates with the first channel and the second channel, and the air duct is positioned on an outer side of the filter medium. The filter medium is arranged between the air duct and a fuel feeding position, such that the stability of a fuel supply pressure and an exhaust state of this fuel filter element is enhanced.