Fuel Injection Valve Sleeve Radial Grooves for Deposit Prevention
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Solution Overview
Problem
Existing fuel injection valves face challenges in preventing fuel accumulation around nozzle holes, leading to deposit formation and performance degradation due to insufficient fuel drainage and complex assembly requirements.
Innovation Solution
A fuel injection valve design featuring a sleeve with radial grooves and a comb teeth-shaped circumferential periphery that contacts the nozzle plate, facilitating fuel drainage through surface tension and independent of the valve's tilt angle, preventing fuel accumulation and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recession is formed around the nozzle hole to drain fuel, then fuel accumulation is reduced, but the space is insufficient for effective drainage
Solution Approach 1:
The invention divides the drainage function into multiple radial grooves extending from the nozzle hole outward, creating segmented drainage paths that increase the effective drainage surface area and improve fuel removal efficiency without requiring a large recession volume
Solution Approach 2:
The invention extends drainage grooves in the radial direction from the nozzle hole, transforming the drainage path from a confined recessional space into an extended radial pathway that increases drainage effectiveness while minimizing the volume occupied
2Reliability
If a heat plate is used to cover the nozzle hole and reduce fuel accumulation, then deposit formation is reduced, but the structure complexity increases
Solution Approach 1:
The invention extracts the heat plate component entirely, replacing it with a simpler groove-based drainage structure that achieves fuel removal and deposit prevention without requiring additional heating elements or complex thermal management systems
Solution Approach 2:
The radial grooves utilize surface tension and capillary action to automatically drain fuel away from the nozzle hole without requiring external heat input or active control mechanisms, making the system self-regulating and simpler in design
3Reliability
If gravitational force is used to drain fuel through a drain groove, then fuel removal is achieved, but the valve tilt angle and screw angle must be adjusted
Solution Approach 1:
The invention replaces gravity-based drainage with surface tension-driven capillary flow in the radial grooves, eliminating the need for gravitational orientation and allowing the valve to function effectively at any tilt or screw angle without assembly adjustments
Solution Approach 2:
The invention changes the drainage mechanism from gravity-dependent flow to surface tension-dependent capillary flow, fundamentally altering the physical parameter that drives fuel removal and making the system independent of orientation angles
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
Effectively restricts fuel accumulation around nozzle holes, maintains injection performance, and simplifies the assembly process by utilizing surface tension to attract and remove fuel, reducing deposit formation and ensuring consistent operation.
Implementation Method 1
fuel is restricted from being deposited around the nozzle hole... utilizing surface tension to attract and remove fuel
Data Source
AI summary
A fuel injection valve includes a valve body having a valve seat, a nozzle plate arranged on an injection side of the valve body, a valve plug for intermitting fuel injection through the nozzle hole, and a sleeve. The nozzle plate has a nozzle hole through which fuel is injected from the injection side of the valve body. The sleeve makes contact with an end surface of the nozzle plate on an opposite side of the valve body with respect to the nozzle plate to partially cover the nozzle plate. Fuel is injected to an outside of the sleeve through the nozzle hole of the nozzle plate and an opening of the sleeve. The end surface of the nozzle plate makes contact with the sleeve in a contact portion. The contact portion has at least one groove that extends from the opening outwardly with respect to a substantially radial direction of the sleeve.