Shielding Wall Thermal Barrier for Fuel Pipes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In internal combustion engines, the high-pressure passage connected to the fuel injection unit can experience vaporization of fuel, leading to air bubbles (vapor lock) due to heat from the engine, making it difficult to supply fuel effectively.
Innovation Solution
An internal combustion engine design featuring a first fuel pump and a second fuel pump, with a shielding wall separating the second fuel pipe connected to the fuel injection device from the cylinder portion, reducing heat transfer and vaporization by holding the fuel pipes securely in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the second fuel pipe is placed close to the cylinder portion for compact arrangement, then the device complexity is reduced, but fuel vaporization increases causing vapor lock
Solution Approach 1:
A shielding wall is introduced as an intermediary component between the second fuel pipe and the cylinder portion. This shielding wall blocks heat transfer from the cylinder to the fuel pipe, preventing fuel vaporization while maintaining a compact engine layout. The shielding wall acts as a thermal barrier that mediates the interaction between the hot cylinder and the fuel-carrying pipe.
2Object-affected harmful factors
If the shielding wall is added to reduce heat transfer, then fuel vaporization is reduced, but the device complexity increases
Solution Approach 1:
The shielding wall is designed to serve multiple functions simultaneously: it acts as a thermal barrier to reduce heat transfer to the fuel pipe, provides structural support for mounting the fuel pipe, and can be integrated with existing engine components. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Object-affected harmful factors
If the second fuel pipe is insulated to prevent heat transfer, then fuel vaporization is reduced, but the manufacturing cost increases
Solution Approach 1:
The shielding wall is merged with the engine block or existing structural components rather than being a separate insulating component. By combining the thermal shielding function with existing structural elements, the manufacturing process is simplified and material costs are reduced compared to adding a dedicated insulating layer around the fuel pipe.
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
This configuration reduces fuel vaporization and prevents vapor lock occurrences, ensuring reliable fuel supply to the fuel injection unit while maintaining a compact and efficient engine design.
Implementation Method 1
a shielding wall covering an outside of the cylinder portion is provided between at least a part of the second fuel pipe and the cylinder portion
Data Source
AI summary
An internal combustion engine that includes a first fuel pump that sucks fuel through a fuel filter, and a second fuel pump that supplies the fuel to a fuel injection device. The internal combustion engine comprises: a first fuel pipe that interconnects the fuel filter, the first fuel pump, and the second fuel pump set to have a pressure higher than a pressure of the first fuel pump; and a second fuel pipe that connects the second fuel pump to the fuel injection device that injects fuel into a combustion chamber formed in a cylinder portion of the internal combustion engine, a shielding wall covering an outside of the cylinder portion is provided between at least a part of the second fuel pipe and the cylinder portion, and the shielding wall includes a holding portion that holds at least the first fuel pipe and the second fuel pipe.