High-Pressure Fuel Pump Discharge Joint Relief Valve
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Solution Overview
Problem
Conventional high-pressure fuel supply pumps face challenges in increasing valve-opening pressure to manage higher fuel pressures while maintaining a compact size, leading to increased pump size and complex pipe layouts, which complicates installation and increases costs.
Innovation Solution
Installing the pressure relief valve in the discharge joint allows for a simpler structure and reduced pump body size, effectively managing higher fuel pressures without enlarging the pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve-opening pressure is increased to manage higher fuel pressures, then the relief function is improved, but the pump size increases due to the need for a stronger and larger relief biasing spring
Solution Approach 1:
The pressure relief valve is relocated from a vertical orientation to a horizontal orientation within the discharge joint. This dimensional change allows the relief biasing spring to be arranged horizontally, efficiently utilizing the radial space in the discharge joint rather than extending vertically, thereby maintaining compact pump size while providing adequate relief capability for high fuel pressures
Solution Approach 2:
The pressure relief valve mechanism is nested within the discharge joint structure. The discharge joint serves as a housing that contains the pressure relief valve and its biasing spring, allowing the relief mechanism to be integrated into the existing pump architecture without requiring additional external space, thus maintaining a compact overall pump size
2Reliability
If the pump size is increased to accommodate a larger pressure relief valve, then the relief function is improved, but the installation flexibility and layout complexity are worsened
Solution Approach 1:
The pressure relief valve is nested within the discharge joint, which is itself an integral part of the pump body. This nested arrangement allows the relief mechanism to be compact and self-contained, maintaining installation flexibility while providing robust pressure relief functionality for high-pressure fuel systems
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 configuration enables a high-pressure fuel supply pump that efficiently uses space and maintains a compact size while providing adequate relief, reducing installation complexities and costs.
Implementation Method 1
a relief spring generating pressing force
Data Source
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AI summary
To increase a valve-opening pressure at which a pressure relief valve is opened in order to deal with a higher pressure of the fuel, a large pressure relief valve is installed in a high-pressure fuel supply pump. This upsizes the high-pressure fuel supply pump. A pressure relief valve 104 is installed in a discharge joint 12. This can provide a high-pressure fuel supply pump that is not large too much and sufficiently performs a relief function by efficiently using the excessive space in the pump even when the fuel pressure is increased.