Pre-chamber Spark Plug Angled Openings Gas Exchange
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Solution Overview
Problem
Pre-chamber spark plugs in gasoline-driven engines face irregular combustions due to incomplete flushing of residual gas, leading to pre-inflammations that increase component temperatures and risk engine damage.
Innovation Solution
A pre-chamber spark plug design featuring a pre-chamber cap with multiple angled openings that direct fuel-air mixture jets to the pre-chamber wall gap to effectively flush out residual gas, preventing self-ignition by ensuring thorough gas exchange and reducing combustion temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pre-chamber spark plug is used to initiate combustion, then combustion efficiency is improved, but residual gas may remain in the pre-chamber causing pre-inflammation and irregular combustion
Solution Approach 1:
The patent extracts and removes residual gas from the pre-chamber by directing fresh fuel-air mixture jets to flush out the combustion products through strategically positioned openings in the pre-chamber cap, preventing pre-inflammation and ensuring reliable combustion
Solution Approach 2:
The patent performs preliminary flushing of the pre-chamber with fresh fuel-air mixture before the next ignition event, ensuring that residual hot gas is removed in advance to prevent irregular combustion and pre-inflammation
2Reliability
If multiple openings are added to the pre-chamber cap to improve gas exchange, then residual gas flushing is enhanced, but device complexity increases
Solution Approach 1:
The patent segments the pre-chamber cap into multiple openings distributed around its circumference, allowing fresh fuel-air mixture to enter from multiple directions and effectively flush residual gas through divided flow paths without requiring a completely redesigned cap structure
3Reliability
If openings are positioned to maximize flushing effect, then residual gas removal is improved, but jet intersection may occur causing combustion instability
Solution Approach 1:
The patent positions the openings asymmetrically or at specific angular intervals around the pre-chamber cap circumference, and angles them to direct jets along the pre-chamber wall in a sequential manner, preventing jet intersection while maintaining effective flushing of residual gas
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 design enhances combustion stability, reduces nitrous oxide emissions, and mitigates engine knock by ensuring efficient gas exchange and precise combustion initiation, improving engine efficiency and reducing pollutant emissions.
Implementation Method 1
The two or more openings are configured so that at least one inflowing fuel-air mixture jet is directed to a pre-chamber wall gap so as to flush out or remove gas from a previous ignition cycle
Data Source
AI summary
A pre-chamber spark plug having a shell, an insulator disposed at least partially within the shell, a center electrode disposed at least partially within the insulator, a ground electrode forming a spark gap with the center electrode, and a pre-chamber cap connected to the shell and forming a pre-chamber. The pre-chamber cap includes two or more openings that are configured so that at least one inflowing fuel-air mixture jet is directed to a pre-chamber wall gap so as to flush out or remove gas from a previous ignition cycle. The two or more openings are angled so that a first inflowing fuel-air mixture jet of a first opening does not intersect with a second inflowing fuel air-mixture jet of a second opening.