Venturi Apparatus for Leakage Fuel Extraction in High Pressure Pumps
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Solution Overview
Problem
Conventional high pressure fuel injection systems experience undesirable pressure buildup due to fuel leakage, leading to over-pressurization of components, which can cause combustion noise, reduce engine component lifespan, and trigger premature failure of pressure relief valves.
Innovation Solution
A system that includes a metering valve and a venturi apparatus to control fuel flow, directing leakage fuel away from high pressure fuel pumps and accumulators, creating a low pressure zone to regulate pressure within predetermined ranges and prevent over-pressurization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metering valve is used to control fuel flow, then fuel injection precision is improved, but fuel leakage through the valve causes pressure buildup downstream
Solution Approach 1:
The patent extracts the harmful leakage fuel from the main fuel line by providing a separate bypass line that branches off before the metering valve and rejoin after it. This bypass line captures the leaked fuel that would otherwise cause pressure buildup downstream and redirects it to the high-pressure fuel pump inlet, resolving the pressure issue while preserving the metering valve's precision function.
Solution Approach 2:
The bypass line acts as an intermediary pathway for the leakage fuel. Instead of allowing the leaked fuel to directly pressurize the downstream system, the bypass line mediates by providing an alternative route that returns the fuel to the pump inlet, where it can be properly pressurized and utilized.
2Loss of energy
If the metering valve is closed to prevent fuel flow, then fuel economy is improved, but leakage fuel still reaches the pump and causes over-pressurization
Solution Approach 1:
When the metering valve is closed to improve fuel economy, the bypass line extracts the leakage fuel that would otherwise cause over-pressurization. By providing this separate pathway, the system maintains fuel economy benefits while preventing the harmful pressure buildup that would occur with conventional direct connection.
Solution Approach 2:
The bypass line converts the harmful effect of metering valve leakage into a beneficial outcome. The leaked fuel, which would normally cause over-pressurization and potential component failure, is instead redirected to the pump inlet where it becomes useful fuel that can be properly pressurized and injected, turning a defect into an advantage.
3Ease of operation
If check valves are used to control fuel flow direction, then fuel delivery control is improved, but premature opening due to leakage fuel causes tolerance pressure buildup
Solution Approach 1:
The bypass line serves as an intermediary that intercepts leakage fuel before it can reach the check valves and cause premature opening. By providing this alternative pathway, the system maintains precise fuel delivery control through the check valves while preventing the tolerance pressure buildup that would result from leaked fuel.
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 effectively reduces pressure buildup, preventing damage to engine components and extending their service life by ensuring fuel is not pressurized unnecessarily, thus maintaining stable operation and reducing maintenance costs.
Implementation Method 1
The venturi apparatus may be further coupled to the fuel supply line downstream of the metering valve to direct the leakage fuel flow out of the fuel supply line
Data Source
AI summary
A system and method for metering fuel is provided which includes a fuel supply line and a metering valve in fluid connection with the fuel supply line to control a flow of fuel through the fuel supply line. The valve is movable into a closed position to block a primary flow of fuel and create a leakage fuel flow in the fuel supply line downstream of the metering valve. The system also includes a venturi apparatus fluidly coupled to the fuel supply line upstream of the metering valve. The venturi apparatus is further coupled to the fuel supply line downstream of the metering valve to direct the leakage fuel flow out of the fuel supply line.