Stepped Armature Fluid Escape Route for Fuel Pump Actuator Erosion
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Solution Overview
Problem
Electrical actuators in fuel pumps experience high velocity fluid flows during operation, leading to erosion and damage of components due to the lack of an escape route for displaced fluid, resulting in potential damage to the actuator's overmolding and other surfaces.
Innovation Solution
The armature design features an inwardly stepped-up profile on its top surface and a gap-forming surface at a radially outward location, allowing for fluid displacement and reducing the risk of erosion by providing an escape route for the fluid, thus mitigating the impact of high velocity flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the armature moves rapidly to control valve positioning, then the control precision and response speed are improved, but the fluid displacement velocity increases causing erosion and damage to components
Solution Approach 1:
The patent extracts the harmful fluid displacement away from the stator surface by providing a dedicated fluid escape route through the gap between the armature and stator. This allows the fluid to be removed from the harmful interaction zone, preventing erosion while maintaining rapid armature movement for precise control.
Solution Approach 2:
The gap between the armature and stator acts as an intermediary pathway for fluid escape. This intermediate space allows fluid to be redirected away from the stator surface, mediating between the rapid armature movement and the stator component to prevent direct harmful impact.
2Object-affected harmful factors
If the armature is designed with a stepped profile, then fluid escape route is provided reducing erosion, but the device complexity increases
Solution Approach 1:
The stepped profile is applied locally to specific regions of the armature surface rather than the entire structure. This localized modification provides the necessary fluid escape routes while minimizing the overall complexity increase, as only specific areas of the armature require the stepped geometry.
Solution Approach 2:
The armature surface is segmented into different levels or steps, creating distinct zones that facilitate fluid escape. This segmentation of the surface geometry provides multiple escape pathways without requiring a complete redesign of the entire armature structure.
3Power
If high pressure fuel injection is used, then the injection effectiveness and emission reduction are improved, but the forces impacting valve seats and stops increase
Solution Approach 1:
The patent extracts the high-pressure fluid away from the valve seat and stop surfaces by providing an escape route through the armature-stator gap. This removes the harmful high-force fluid impact from these components while maintaining the high-pressure injection capability for effective fuel delivery and emission reduction.
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 armature design effectively reduces fluid velocity and energy at the point of displacement, preventing erosion and damage to the actuator components, ensuring reliable operation and extended component lifespan.
Implementation Method 1
electrical actuators such as solenoid actuators are used to control valve positioning and fluid connections. Solenoids produce a magnetic field when electrical current is applied that can generate local forces with sufficient energy to actuate components within the fuel system hardware.
Data Source
AI summary
A valve assembly for a pump includes an electrical actuator having a stator and an armature, where the armature includes a top armature surface facing the stator and having an inwardly stepped-up profile that forms a raised surface at a radially inward location, and a lower, gap-forming surface at a radially outward location that forms a gap between the armature and the stator when the electrical actuator is activated to facilitate displacing fluid and avoiding production of high velocity, potentially damaging fluid flows.