Fuel Dispenser Segmented Cylinders Flashback Arrestor
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Solution Overview
Problem
Existing fuel dispensers for two-stroke engines face challenges in accurately mixing fuel and oil, as the ratio of fuel to oil is often incorrect, and changing the concentration of oil in the fuel mixture is difficult once mixed.
Innovation Solution
A fuel dispenser with two cylinders and pistons that allow for precise control of fluid mixing, using a displacement device to deliver a 2:1 proportion of fuel to oil, and incorporating a flashback arrestor to prevent explosions and fires, with adjustable features for varying ratios and volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If oil is added to the fuel tank before filling with fuel, then the fuel and oil can be mixed, but it is difficult to obtain a homogeneous mixture and the concentration cannot be easily changed
Solution Approach 1:
The fuel container is divided into two separate compartments: a fuel tank and an oil tank. This segmentation allows each fluid to be stored separately and then mixed in a controlled manner through a mixing chamber, ensuring homogeneous mixture while maintaining ease of operation.
Solution Approach 2:
A mixing chamber acts as an intermediary between the fuel tank and oil tank. This intermediate chamber allows the fuel and oil to mix thoroughly before being dispensed, ensuring homogeneous mixture without requiring complex mixing operations.
2Device complexity
If a traditional single-cylinder dispenser is used, then the device is simple, but the fuel to oil ratio cannot be accurately controlled
Solution Approach 1:
The dispenser is segmented into two separate cylinders: a fuel cylinder and an oil cylinder. Each cylinder has its own piston and dispensing mechanism, allowing independent control and accurate measurement of each fluid's volume, thereby achieving precise ratio control while maintaining reasonable device simplicity.
3Device complexity
If the fuel and oil are mixed in a single container, then the mixing process is simple, but the concentration of oil in the fuel cannot be changed once mixed
Solution Approach 1:
The mixing chamber is designed to be dynamically controllable. The system allows users to adjust the mixing ratio by controlling the dispensing from the fuel tank and oil tank independently, enabling concentration adjustability while maintaining a simple mixing process through the chamber.
Solution Approach 2:
By segmenting the storage into separate fuel and oil tanks with independent control mechanisms, the system allows flexible adjustment of the mixing ratio. The segmented design enables users to change concentrations by controlling the relative amounts dispensed from each tank, while the mixing chamber maintains process simplicity.
4Device complexity
If no flashback arrestor is installed, then the device structure is simpler, but explosions and fires may occur due to flame backflow
Solution Approach 1:
A flashback arrestor is installed as an intermediary component in the fuel dispensing system. This device acts as a safety barrier that prevents flame backflow into the fuel tank while allowing fuel to pass through, thereby eliminating explosion and fire risks without significantly complicating the overall device structure.
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
Enables accurate and customizable mixing of fuel and oil, ensuring the correct ratio is maintained, enhancing safety and efficiency in fuel dispensing for two-stroke engines.
Implementation Method 1
Using a displacement device typically allows the volume of fluids displaced from each cylinder to be accurately controlled
Implementation Method 2
actuation of the dispenser causes fluid from the first cylinder and fluid from the second cylinder to mix in the mixing line in a proportion of at least 2:1
Implementation Method 3
The flashback arrestor can reduce and typically stop the possibility of a flame from burning back through the mixing line or the conduit into the first and/or second cylinder of the dispenser
Data Source
AI summary
A fuel dispenser includes first and second cylinders adapted to contain respective first and second fluids, one being fuel and the other being a fuel additive such as a lubricant. First and second pistons in the cylinders displace the fluids through outlets and into a mixing line. The dispenser typically allows the volume of fluids displaced from each cylinder to be accurately controlled and adjusted in order to change the ratios. This is achieved by an adjustable aperture adapted to be opened and closed and optionally varied in degree of opening, typically by rotation of at least one of the components, to release fluid contained in the cylinder in front of the piston without passing the fluid into a mixing line. The adjustable aperture includes an aperture in a piston head, allowing the fluid in front of the piston to pass into or through the piston.