Gaseous Fuel Mixing Device for Carburetor Conversion
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Solution Overview
Problem
Existing carburetors designed for liquid fuels are not suitable for gaseous fuels like propane and natural gas, necessitating a mixing device that can effectively mix gaseous fuels with air for internal combustion engines while adhering to emission regulations.
Innovation Solution
A modified carburetor body with an air/fuel passageway and a gaseous fuel passageway, incorporating a throttle valve and an intake unit with jets and a selector valve to manage the flow of gaseous fuel, allowing for efficient mixing and delivery to the engine cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a typical carburetor is used for liquid fuel, then the carburetor can deliver vaporized gasoline to the cylinder, but it is not suitable for gaseous fuels like propane and natural gas
Solution Approach 1:
The patent modifies the carburetor by changing key parameters: removing the fuel bowl and float mechanism designed for liquid fuel, adding a gaseous fuel inlet with regulator, and modifying the venturi and jet system to work with gaseous fuel properties. This allows the same carburetor body to adapt to different fuel types through parameter adjustments rather than complete redesign
Solution Approach 2:
The patent creates a universal carburetor design that can handle both liquid and gaseous fuels by incorporating interchangeable components and adjustable features. The modified carburetor body can be configured for different fuel types, making it a multi-functional device that serves multiple purposes without requiring completely separate systems for each fuel type
2Reliability
If a new mixing device is designed specifically for gaseous fuels, then it can meet emission regulations, but it increases device complexity and cost
Solution Approach 1:
The patent segments the mixing device into distinct functional modules: a modified carburetor body handling the mixing function, a separate gaseous fuel inlet with regulator for fuel delivery control, and an air intake system. This segmentation allows each component to be optimized for its specific function while maintaining overall simplicity and meeting emission requirements through proper design of each segment
3Ease of manufacture
If a modified carburetor body is used with gaseous fuel, then cost is reduced, but the carburetor must be redesigned to handle gaseous fuel properties
Solution Approach 1:
The patent extracts and removes the liquid-fuel-specific components (fuel bowl, float, and associated linkages) from the carburetor design. By taking out only the necessary liquid-fuel mechanisms and retaining the core carburetor body structure, the invention reduces manufacturing cost while requiring minimal modification to the main carburetor casting, achieving a balance between cost-effectiveness and functional adaptability
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 enables cost-effective conversion of existing carburetors for use with gaseous fuels, ensuring efficient fuel-air mixing and compliance with emission standards without the need for separate regulators or electronic controllers, thus making gaseous fuel engines more viable.
Implementation Method 1
The venturi is in communication with the fuel bowl such that, as air flows through the venturi, liquid fuel is drawn from the fuel bowl and into the intake passageway
Implementation Method 2
The intake unit includes a fuel chamber, a first jet, and an optional second jet
Data Source
AI summary
A gaseous fuel mixing device includes a body having an air/fuel passageway and a gaseous fuel passageway in fluid communication with the air/fuel passageway, a throttle valve pivotably coupled to the body and positioned in the air/fuel passageway, and an intake unit coupled to the body. The intake unit includes an inlet configured to be fluidly connected with a source of gaseous fuel, a first jet fluidly communicating the inlet and the gaseous fuel passageway, a second jet selectively fluidly communicating the inlet and the gaseous fuel passageway, and a selector valve operable to control a flow of gaseous fuel through the second jet.