Injector Nozzle Back-Wall Shielding During Laser Microhole Drilling
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Solution Overview
Problem
During laser drilling of fuel injector nozzle holes, the laser beam path can cause damage to the back wall of the nozzle, as it continues through the micro hole and potentially damages the internal surface, necessitating a protective measure.
Innovation Solution
A back wall protection device with a hollow shaft, pressure path, and actuator is inserted into the fuel path, where the actuator, typically a piston or motor-driven linear actuator, is used to push a protection component that blocks the laser beam path to the back wall, preventing damage by directing the laser to strike the protection component instead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser drilling is used to create micro holes in the fuel injector nozzle, then manufacturing precision and productivity are improved, but the back wall of the nozzle is damaged by the laser beam
Solution Approach 1:
A protection component is introduced as an intermediary element between the laser beam and the back wall of the nozzle. This component absorbs the laser energy that would otherwise damage the back wall, while being replaceable to maintain manufacturing precision over multiple uses
Solution Approach 2:
The protection component is positioned in advance within the nozzle before laser drilling begins. This preliminary placement ensures the back wall is protected from the start of the drilling process, preventing damage before it occurs
2Object-affected harmful factors
If a protection component is added to block the laser beam path, then the back wall is protected from damage, but the device complexity increases
Solution Approach 1:
The protection device is segmented into modular components: a removable protection component, an actuator mechanism, and a mounting structure. This segmentation allows the protection function to be added without permanently complicating the nozzle structure, as components can be independently replaced or adjusted
Solution Approach 2:
The protection component is made movable through an actuator mechanism that can position it into and out of the laser path. This dynamic capability allows the system to switch between protected and unprotected states, managing complexity by only activating protection when needed
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 protects the back wall from laser damage during drilling by blocking the laser beam path with a replaceable protection component made of thermal or laser-resistant materials, ensuring the integrity of the nozzle's internal surface.
Implementation Method 1
pressurized fluid is introduced into the pressure path to push the piston and back wall protection component up towards the nozzle tip
Implementation Method 2
A laser is then applied to the laser beam path to drill a nozzle hole at the desired location
Implementation Method 3
the laser will strike the back wall protection component that is blocking the laser beam path to the back wall, thereby protecting the back wall from laser damage
Data Source
AI summary
Disclosed is a device for protecting the back wall of a fuel injector nozzle during drilling of nozzle holes.