Suction Head Filter Fabric Weave for Fuel Flow Resistance
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Solution Overview
Problem
Suction heads with filter properties used in portable engines face increased flow resistance and fuel delivery issues due to dirt accumulation on filter elements, leading to potential malfunctions, especially in hand-held tools with carburetors and electromagnetic valves.
Innovation Solution
A suction head design featuring a second filter element with a twill or satin weave filter fabric of mesh size between 10 μm and 25 μm, which prevents dirt penetration and cake formation, maintaining high filter efficiency without increasing flow resistance, and is integrated into the base body using injection molding technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter element with small mesh size is used to prevent dirt penetration, then filter effect is improved, but flow resistance increases and fuel delivery decreases
Solution Approach 1:
The patent employs a porous sintered metal filter element instead of traditional filter fabric. The sintered structure provides controlled porosity with interconnected pores that maintain open channels for fuel flow while trapping particles. This porous material structure allows the filter to maintain low flow resistance even with fine particle retention capability, resolving the contradiction between high filter effect and adequate fuel delivery.
Solution Approach 2:
The patent changes the physical and chemical parameters of the filter material by using sintered metal with specific pore size distribution, porosity percentage, and surface area characteristics. These parameter changes enable the filter to achieve high particle retention while maintaining sufficient fuel flow through the optimized pore structure, addressing the contradiction between filtration efficiency and flow rate.
2Reliability
If a filter fabric with small mesh size is used to retain dirt particles, then dirt retention is improved, but filter cake formation increases flow resistance
Solution Approach 1:
The sintered metal filter element provides a three-dimensional porous network that prevents dirt particles from forming a compact filter cake on the surface. The interconnected pores allow particles to be trapped within the depth of the filter structure rather than accumulating on the surface, maintaining consistent flow resistance over time while achieving effective dirt retention.
Solution Approach 2:
The patent transitions from a two-dimensional surface filtration approach (filter fabric) to a three-dimensional depth filtration approach (sintered metal structure). This dimensional change allows particles to be captured throughout the volume of the filter element rather than just on the surface, preventing filter cake formation and maintaining stable flow characteristics while retaining dirt effectively.
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 ensures a long service life with minimal clogging and consistent flow resistance, effectively preventing dirt from entering the fuel system and protecting valve trains from wear.
Implementation Method 1
The second, outer filter element consists of a filter fabric made in twill weave or satin weave, the filter fabric having a mesh size greater than 10 μm and smaller than 25 μm. The very small mesh size ensures a high filter effect and prevents dirt from penetrating the fuel system of the mixture formation device.
Implementation Method 2
The injection molding material of the base body positively engages in the fabric structure of the filter fabric in the area of the webs. The filter fabric is advantageously held in a form-fitting manner on the webs.
Data Source
Figure 1
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AI summary
The invention relates to a suction head (20) for connection to a fuel hose (14) in a fuel tank (15), wherein the suction head (20) has a housing-shaped base body (22) made of an injection-molded material (49). The base body (22) is formed with an end-face opening (24) which is closed by means of a cap (27). The suction head (20) includes a connection nozzle (21) for the fuel hose (14), wherein a first filter element (50) is received in the base body (22) and recesses (30, 31, 32, 33) are formed in the outer surface (26) of the base body (22), which are covered by a second filter element (60). In order to provide a filter-effective suction head (20), the second filter element (60) is to be made from a filter fabric (61) manufactured in twill weave or satin weave, which has a mesh size (W) greater than 10 µm and less than 25 µm.