Fuel Cell Stem Receiver Block for Combustion Fastener Driver
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Solution Overview
Problem
Existing fuel delivery systems for combustion tools face challenges in maintaining consistent fuel dosing, especially at lower temperatures, due to issues like fuel leakage, dimensional tolerance buildup, and exposure of the fuel cell stem to accidental contacts, which can lead to damage or inefficient fuel usage.
Innovation Solution
A fuel delivery system that includes a metal fuel cell stem receiver block and a fuel cell adapter with a tubular collar to protect the stem and accommodate dimensional variations, along with a flexible suspension to ensure consistent engagement and movement, enhancing sealing and vaporization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fuel cell stem is provided with an adapter extension, then the stem can engage with the tool's fuel delivery system, but the stem becomes exposed to external accidental contacts that may damage or break the stem
Solution Approach 1:
A protective collar is introduced as an intermediary component between the fuel cell stem and the external environment. The collar receives and protects the stem while allowing the stem to reciprocate within it, preventing external accidental contacts from damaging the stem.
2Manufacturing precision
If the fuel delivery system uses multiple components to accommodate dimensional variations, then manufacturing tolerances can be managed, but the system complexity increases and fuel leakage risk increases
Solution Approach 1:
The protective collar is designed to move dynamically with the stem, receiving its reciprocating motion. This dynamic design allows the collar to accommodate dimensional variations and manufacturing tolerances while maintaining a sealed relationship, reducing leakage risk without requiring excessive components.
3Loss of energy
If the fuel delivery system maintains a sealed relationship, then fuel efficiency improves, but the system becomes more sensitive to temperature changes and manufacturing variations
Solution Approach 1:
The protective collar acts as a flexible protective shell that maintains the sealed relationship while accommodating thermal expansion and contraction. The collar's design allows it to flex and adjust to temperature changes and manufacturing variations, preserving fuel efficiency across different operating conditions.
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 system achieves more consistent fuel dosing and improved performance at lower temperatures by reducing leaks and accommodating dimensional variations, while protecting the fuel cell stem from damage and ensuring efficient fuel flow.
Implementation Method 1
A fuel cell adapter is provided to protect a fuel cell stem from accidental external contacts
Implementation Method 2
the stem receiver block includes an internal receiver passage in fluid communication with the stem engagement portion and adapted for delivering fuel to the combustion chamber
Implementation Method 3
a stem receiver block connected to the tool combustion chamber and also directly in contact with the fuel cell stem
Data Source
AI summary
A fuel delivery system for use with a combustion fastener driver including a cylinder head frame, the system includes a fuel cell with an outer shell having a closed lower end and an open upper end, a closure crimped over the upper end and defining an opening for accommodating a reciprocating valve stem, a fuel cell adapter frictionally engaging the closure and including a flange configured for suspending the fuel cell in a tool fuel cell chamber. The adapter includes a collar configured for receiving the valve stem and being suspended for restricted vertical movement relative to the flange. A stem receiver block is connectable to the cylinder head frame and includes a stem engagement portion configured for directly and sealingly engaging an end of the valve stem, the stem engagement portion being in fluid communication with an internal receiver passage constructed and arranged for delivering fuel to a combustion chamber.