Fuel Composition for Combustion Tools Low Temperature
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Solution Overview
Problem
Conventional combustion tool fuels experience performance degradation at lower temperatures, leading to increased misfires due to slower fuel evaporation and mixing with air, limiting their usability in varied weather conditions.
Innovation Solution
A fuel composition with a total vapor pressure of at least 95 psig at 21°C, comprising high vapor pressure hydrocarbon components such as propylene, propane, and MAPP gas, along with a propellant having a vapor pressure of at least 140 psig at 21°C, is used to enhance fuel delivery and evaporation rates, improving tool performance at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fuel formulations are used, then the fuel maintains stable composition and is easy to store, but the fuel evaporation rate decreases at lower temperatures causing tool misfires
Solution Approach 1:
The patent changes the chemical composition parameters of the fuel by incorporating high vapor pressure components (ethylene, propylene, butylene) in specific proportions. This parameter change enables the fuel to maintain adequate evaporation rates at lower temperatures while preserving stable storage characteristics, directly resolving the contradiction between reliability and evaporation speed.
Solution Approach 2:
The patent creates a composite fuel formulation by combining multiple hydrocarbon components (ethylene 10-40%, propylene 30-60%, butylene 10-40%) with complementary properties. This composite approach allows the fuel to exhibit both high evaporation rate (from lighter components) and stable composition (from the balanced mixture), resolving the reliability-speed contradiction.
2Speed
If fuel vapor pressure is increased to improve low temperature performance, then the fuel evaporation rate increases, but the risk of premature combustion and safety hazards increases
Solution Approach 1:
The patent carefully controls the vapor pressure parameter by selecting specific hydrocarbon components and their proportions. The formulation achieves vapor pressure between 90-150 psig at 21°C, which is sufficient for low-temperature evaporation but controlled enough to prevent premature combustion, resolving the contradiction between evaporation rate and safety.
Solution Approach 2:
The patent applies local quality by ensuring the fuel delivers appropriate vapor pressure characteristics at the point of combustion while maintaining stable liquid phase during storage and transport. The high vapor pressure components are strategically selected to provide evaporation benefit only when needed in the combustion chamber, not during storage.
3Speed
If high vapor pressure fuel components are used, then the fuel delivers faster evaporation and improved low temperature performance, but the fuel composition becomes less stable
Solution Approach 1:
The patent formulates a stable composite by combining high vapor pressure components (ethylene, propylene, butylene) in balanced proportions. This composite structure maintains composition stability through the complementary properties of the components while achieving the required evaporation rate, resolving the contradiction between speed and stability.
Solution Approach 2:
The patent optimizes the concentration parameters of each component to achieve the desired balance. By controlling the percentage ranges of ethylene (10-40%), propylene (30-60%), and butylene (10-40%), the formulation maintains stable composition while ensuring adequate evaporation performance.
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 improved fuel composition significantly reduces missed shots and extends the operational temperature range of combustion tools, allowing for more efficient use in colder conditions by ensuring faster fuel travel and evaporation, thereby enhancing user productivity.
Implementation Method 1
The propellant has a higher vapor pressure than the fuel pressure and maintains the fuel in a liquefied state during operation
Implementation Method 2
a fuel composition with a total vapor pressure of at least 95 psig at 21°C, comprising high vapor pressure hydrocarbon components such as propylene, propane, and MAPP gas, along with a propellant having a vapor pressure of at least 140 psig at 21°C, is used to enhance fuel delivery and evaporation rates
Implementation Method 3
mixed with air and ignited to combust and provide energy for inserting a fastener into a work piece
Data Source
AI summary
A combustion tool fuel cell is provided having enhanced low temperature operation, including a fuel composition comprising at least one hydrocarbon component with a total vapor pressure equal or above 95 psig at 21° C.