Variable Cross-Section Precombustion Chamber for Gas-Powered Fixing Tools
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Solution Overview
Problem
Gas-powered fixing tools face inefficiencies due to complex and bulky evaporator elements, which are prone to clogging and costly, and precombustion chambers that are lengthy, increasing the firing cycle duration and tool size.
Innovation Solution
A simplified evaporator block with a plane filter and a precombustion chamber with a variable cross-section and spherical or ovoid shape to reduce size and improve ergonomics, along with a dual sealing mechanism in the working chamber to enhance combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a precombustion chamber with constant cross section is used, then the structure is simple, but the length is excessive which increases firing cycle duration
Solution Approach 1:
The precombustion chamber employs a variable cross-section design where the transverse dimensions change along the longitudinal axis. This dynamic geometric variation optimizes the balance between structural simplicity and functional performance, reducing the chamber length while maintaining effective combustion.
Solution Approach 2:
The chamber cross-sectional parameters are varied along its length, transitioning from a larger cross-section at the fuel injection end to a smaller cross-section at the ignition end. This parameter change enables compact dimensions while preserving the necessary combustion volume and flow characteristics.
2Productivity
If a spherical or ovoid form is used for the combustion cavity, then sharp edges and intersections are reduced improving combustion efficiency, but the shape complexity increases
Solution Approach 1:
The combustion cavity is designed with spherical or ovoid geometry, eliminating sharp edges and intersections that create dead areas. This curved surface design improves combustion efficiency by ensuring uniform flame propagation and eliminating flow stagnation zones, while the symmetry of the spherical form actually simplifies the manufacturing process.
3Length of moving object
If the combustion chamber length is reduced, then the overall tool size decreases, but the flame travel time is reduced which may affect combustion completeness
Solution Approach 1:
The variable cross-section parameters are carefully optimized to maintain sufficient combustion volume within a compact length. The cross-sectional area is larger near the fuel injection end to accommodate complete combustion, and tapers toward the ignition end, ensuring that the flame has adequate space and time to propagate completely despite the reduced overall length.
Solution Approach 2:
Different sections of the chamber have different cross-sectional qualities tailored to their specific functions. The larger cross-section at the fuel injection end facilitates thorough mixing and ignition, while the smaller cross-section at the ignition end optimizes flame propagation. This local differentiation ensures complete combustion within a compact overall dimension.
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 solution reduces tool size, shortens the firing cycle, improves combustion efficiency, and simplifies maintenance while maintaining energy output, making the tool more balanced and efficient.
Implementation Method 1
an internal combustion engine operating by igniting an air-fuel mixture in a combustion chamber
Implementation Method 2
said cavity has a generally staged form and comprises at least one first portion of cross section S1 and one second portion of cross section S2, with S1 different from S2
Implementation Method 3
ignition mechanism, such as a spark plug, is situated at a longitudinal end of said cavity
Data Source
AI summary
The present disclosure concerns improvements for a gas-powered fixing tool, and particularly a combustion chamber or precombustion chamber for a gas-powered fixing tool, a working chamber for a gas-powered fixing tool, a fuel gas injection device for a gas-powered fixing tool and a gas-powered fixing tool including one or more of these elements.