Fuel Pressure Regulator Filter Assembly With Laser-Welded Leak Sealing
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Solution Overview
Problem
The existing fuel pressure regulator and fuel filter assemblies integrated by secondary injection molding often suffer from fuel leakage and have complex, high-cost structures.
Innovation Solution
A fuel pressure regulator and fuel filter assembly with a simplified structure, featuring a housing, filter element, cover plate, rear cover with a spring and seal, and a fixing ring welded by laser, which eliminates secondary injection molding and prevents fuel leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If secondary injection molding is used to integrate the fuel pressure regulator and fuel filter housing, then the structure appears integrated, but fuel leakage occurs at the joint between the housing and the fuel pressure regulator
Solution Approach 1:
The patent divides the fuel pressure regulator assembly into separate components: the housing and the regulator body are not integrated by secondary injection molding but are instead connected through a flange connection with a sealing ring. This segmentation eliminates the leakage problem at the joint while maintaining a compact overall structure.
Solution Approach 2:
A sealing ring is introduced as an intermediary element between the housing and the fuel pressure regulator body. This sealing ring prevents fuel leakage at the connection joint, solving the reliability issue without requiring complex integrated molding.
2Ease of manufacture
If secondary injection molding is used to integrate the fuel pressure regulator and fuel filter housing, then integration is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent separates the housing and regulator body into distinct components that can be manufactured independently using standard machining processes, avoiding the high cost of secondary injection molding while ensuring reliable sealing through the flange connection and sealing ring.
3Device complexity
If the fuel pressure regulator is integrated into the fuel filter housing by secondary injection molding, then the structure is compact, but the structure becomes complex and costly
Solution Approach 1:
The patent adopts a segmented design where the housing and fuel pressure regulator are separate components connected by a flange. This approach simplifies the manufacturing process by allowing each component to be produced independently using conventional methods, reducing overall complexity and cost compared to integrated secondary injection molding.
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 achieves a low-cost, simple structure that effectively regulates fuel pressure and prevents fuel leakage, ensuring reliable operation without the need for complex secondary injection molding processes.
Implementation Method 1
when fuel pressure in the housing is no greater than a spring preload, the seal is pressed tightly against the connecting end of the housing and closes the fuel channel
Implementation Method 2
a fixing ring, which fits the rear cover to fix the rear cover to the connecting end of the housing, the fixing ring being welded by laser to the connecting end
Data Source
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AI summary
The present device relates to a fuel pressure regulator and fuel filter assembly, comprising: a housing, having an accommodating cavity and a connecting end, the connecting end having a fuel channel; a filter element, located in the accommodating cavity of the housing; a cover plate, located at one end of the housing; a rear cover, with one end thereof being an opening end and another end being a spring seat, and an opening being provided in a sidewall of the rear cover, the opening end being connected to the connecting end of the housing; a spring, a first end thereof being pressed against the spring seat of the rear cover; a seal, being located in the rear cover, with a second end of the spring being pressed against the seal. When fuel pressure is no greater than a spring preload, the seal is pressed tightly against the connecting end of the housing and closes the fuel channel; and a fixing ring, which fits the rear cover to fix the rear cover to the connecting end of the housing, the fixing ring being welded by laser to the connecting end.