Fuel Jet Pump Homogeneity and Segmentation for Transfer Efficiency
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Solution Overview
Problem
Traditional fuel storage and delivery systems face inefficiencies due to suboptimal configuration and placement of jet pumps, leading to poor fit conditions and creep resistance issues when exposed to harsh fuel and temperature environments.
Innovation Solution
A fuel jet pump assembly with a body and a tubular insert, where the body defines a mixing passage, low pressure passage, and cavity in communication, and the insert defines a high pressure passage and calibrated orifice, optimized for improved fuel transfer performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional jet pumps use plastic bodies with brass inserts, then the pump can be manufactured with mixed materials, but the fit conditions between body and insert deteriorate and creep resistance decreases in harsh fuel and temperature environments
Solution Approach 1:
The patent applies homogeneity by making both the jet pump body and insert from the same plastic material, eliminating the interface between dissimilar materials. This ensures uniform thermal expansion, consistent chemical resistance, and reliable fit conditions throughout the assembly when exposed to harsh fuel and temperature environments.
2Device complexity
If the jet pump is located in the primary chamber, then the pump assembly is simplified, but the fuel transfer performance deteriorates due to suboptimal placement and configuration
Solution Approach 1:
The patent applies segmentation by separating the jet pump into two functional components: the body remaining in the primary chamber for structural integration, and the insert (containing the orifice and high-pressure passage) positioned in the secondary chamber for optimal fuel transfer geometry. This spatial segmentation enables both simplified assembly and improved fuel transfer performance.
3Manufacturing precision
If calibrated orifices are made from brass inserts, then precise orifice calibration is achieved, but poor fit conditions occur between the brass insert and plastic body
Solution Approach 1:
The patent resolves the fit condition problem by manufacturing both the body and insert from the same plastic material, ensuring thermal and chemical compatibility. Precision is maintained through integrated molding techniques that achieve tight tolerances without requiring dissimilar material interfaces.
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 optimized fuel jet pump assembly enhances fuel transfer efficiency by reducing critical high-pressure assembly interfaces, allowing for adaptable designs, and utilizing self-centered plastic molded inserts for precise orifice positioning, thereby improving system performance and reducing component complexity.
Implementation Method 1
The high pressure passage may flow fuel from the inlet port and through the calibrated orifice, the low pressure passage may flow fuel into the intersection
Data Source
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AI summary
A fuel system (28) for a partitioned fuel tank (26) includes a fuel pump assembly (36), a fuel jet pump device (38), a high pressure conduit (40), and a low pressure conduit (42). The tank (26) defines a first chamber (30) and a second chamber (32). The fuel pump assembly (36) is disposed in the first chamber (30), and includes a motorized fuel pump (48). The jet pump device (36) is disposed in the second chamber (32), and defines a low pressure passage (100) adapted to draw fuel (22) from the second chamber (32), a high pressure passage (108), and a mixing passage (94) adapted to receive and mix fuel (22) flowing from the low and high pressure passages. The high pressure conduit (40) extends between the first and second chambers (30,32), and is in communication between an outlet (82) of the fuel pump (48) and the high pressure passage (108). The low pressure conduit (42) extends between the first and second chambers (30,32), and is in communication between the mixing passage (94) and the first chamber (30).