Combustion-Engine Setting Tool Pre-Compression Mechanism
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Solution Overview
Problem
Existing combustion-engined setting tools face inefficiencies in thermal efficiency due to combustion occurring at atmospheric pressure, leading to low peak pressures and difficulties in driving longer fastening elements, especially when the stem blocks the nail guide, limiting time for feeding new nails.
Innovation Solution
A compression device driven by a ventilator electric motor is integrated to compress the oxidant-fuel gas mixture above atmospheric pressure, using a charging cylinder, displacement body, and valve means to control the connection between the charging cylinder and combustion chamber, allowing for high-pressure combustion and efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If combustion occurs at atmospheric pressure without pre-compression, then the device structure remains simple, but thermal efficiency is low and peak pressures are insufficient
Solution Approach 1:
The patent combines the ventilator function with the compression function into a single integrated system. The ventilator drive mechanism serves dual purposes: generating airflow for combustion and simultaneously compressing the gas mixture in the charging cylinder before delivery to the combustion chamber, thereby improving thermal efficiency without proportionally increasing device complexity
Solution Approach 2:
The patent implements pre-compression of the oxidant-fuel gas mixture in the charging cylinder before it enters the combustion chamber. This preliminary compression raises the initial pressure of the charge, enabling more efficient combustion and higher peak pressures, which directly addresses the thermal efficiency problem
2Productivity
If the setting piston stem is positioned in the nail guide during operation, then the fastening element can be driven, but feeding of new nails is blocked
Solution Approach 1:
The patent employs dynamic positioning of the setting piston stem, which can be relocated between different positions during operation. The stem can be positioned in the nail guide during driving operations for high productivity, and relocated to allow nail feeding when needed, making the system adaptable to different operational phases and eliminating the time loss associated with manual intervention
3Stress or pressure
If combustion pressure is increased through pre-compression, then thermal efficiency improves, but device complexity increases due to additional compression mechanisms
Solution Approach 1:
The patent designs the ventilator drive mechanism to perform multiple functions: it generates the airflow necessary for combustion, drives the displacement body to compress the gas mixture in the charging cylinder, and controls the timing of charge delivery to the combustion chamber. This multi-functionality allows high combustion pressure to be achieved without adding separate dedicated compression components, thereby limiting the increase in device complexity
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 achieves higher combustion pressures, enhancing thermal efficiency and enabling faster and more reliable driving of fastening elements, including longer nails, by ensuring the drive energy is used efficiently and only when necessary.
Implementation Method 1
ventilator means for producing turbulence in the combustion chamber
Implementation Method 2
compression device for compressing gases fed into the combustion chamber
Implementation Method 3
combustion chamber for receiving an oxidant-fuel gas mixture, a piston guide located adjacent to the combustion chamber and in which a drive piston for driving the fastening elements in is displaceable by combustion gases produced by combustion of the oxidant-fuel gas mixture
Data Source
AI summary
A combustion-engined setting tool for driving fastening elements in a constructional component includes at least one combustion chamber (11) for receiving an oxidant-fuel gas mixture, a piston guide (17) located adjacent to the combustion chamber (11), and in which a drive piston (15) for driving the fastening elements in is displaceable by combustion gases, a ventilator for creating turbulence in the combustion chamber (11), and a compression device (30) for compressing gases fed into the combustion chamber (11) and driven by the ventilator drive (21).