Combustion Chamber Ring Profile for Stable Fastener Tool Ignition
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Solution Overview
Problem
Certain combustion powered fastener driving tools experience inconsistent or incomplete combustion due to turbulence in the combustion chamber directed towards the ignition tip of the spark plug, particularly in cold weather conditions.
Innovation Solution
A combustion chamber ring is designed with a downwardly sloping profile to redirect vaporized fuel away from the spark plug ignition tip, reducing turbulence and ensuring consistent combustion by configuring the chamber ring to minimize fuel velocity and turbulence at the ignition tip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional combustion chamber ring is used, then the tool structure is simple, but turbulence is directed toward the ignition tip causing inconsistent combustion
Solution Approach 1:
The combustion chamber ring incorporates a downwardly sloping profile specifically in the region where fuel vapor interacts with the ignition tip. This localized geometric modification redirects turbulence away from the ignition tip while maintaining simple ring structure elsewhere, thereby improving combustion consistency without significantly increasing overall device complexity.
2Reliability
If the combustion chamber ring redirects turbulence away from the ignition tip, then combustion consistency improves, but the chamber ring geometry becomes more complex
Solution Approach 1:
The combustion chamber ring employs a downwardly sloping curved profile instead of sharp angles or complex multi-component structures. This smooth curvature effectively redirects fuel vapor turbulence away from the ignition tip while maintaining manufacturing simplicity and avoiding excessive geometric complexity.
3Reliability
If the chamber ring reduces fuel velocity at the ignition tip, then combustion reliability improves, but the ring design becomes more complicated
Solution Approach 1:
The downwardly sloping profile of the combustion chamber ring modifies the flow parameters of fuel vapor by reducing its velocity and redirecting turbulence away from the ignition tip. This geometric parameter change achieves improved ignition reliability without requiring complex active control mechanisms or multi-component structures.
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 redesigned combustion chamber ring ensures consistent and complete combustion of fuel in various weather conditions, enhancing the operational reliability of the fastener driving tool.
Implementation Method 1
turbulence in the combustion chamber to be directed toward the ignition tip of the spark plug
Implementation Method 2
vaporized fuel dose in the combustion chamber
Implementation Method 3
ignite the fuel/air mixture in the combustion chamber to start the fastener driving cycle. This generates high-pressure combustion gases
Implementation Method 4
a spark generator to deliver a spark and ignite the fuel/air mixture
Implementation Method 5
high-pressure combustion gases that expand and act on the piston to force the driving assembly to move through the cylinder
Data Source
AI summary
A combustion powered fastener driving tool including a combustion chamber ring configured to connect the combustion chamber to the cylinder head, the combustion chamber ring configured to reduce turbulence and velocity of vaporized fuel dispensed into the combustion chamber from the fuel cell.