Fuel Pump Degassing Piston Guidance Mechanism
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Solution Overview
Problem
Existing degassing devices for fuel distribution equipment face inefficiencies due to piston blockage and fuel leakage issues when the fuel is slightly gas-loaded, leading to reduced yield and foam formation in the pump.
Innovation Solution
A degassing device with guiding means positioned upstream of the control chamber to prevent piston slanting and blockage, featuring a central tube and annular guiding channel to ensure smooth piston movement and maintain a stable closed position, reducing the risk of fuel overflow and un-degassed fuel delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial pipe diameter is increased to handle highly gas-loaded fuel, then effective degassing is improved, but the system complexity and fuel loss increase due to permanent leakage when the piston is closed
Solution Approach 1:
The system dynamically adjusts the axial pipe diameter through piston movement between open and closed positions, allowing the diameter to vary based on gas content conditions rather than being fixed, thus optimizing degassing efficiency while minimizing fuel loss
Solution Approach 2:
The gas content of the fuel acts as a controlling parameter that triggers piston movement, changing the flow cross-section area of the axial pipe from large (open position for high gas content) to small (closed position for low gas content), adapting the system to different operating conditions
2Loss of substance
If the piston is positioned to close the axial opening to reduce fuel loss, then fuel leakage is reduced, but the piston may become blocked due to slanting
Solution Approach 1:
The guiding means act as an intermediary mechanical structure between the piston and control chamber walls, providing a constrained path that prevents the piston from slanting and becoming blocked while allowing it to move freely between open and closed positions
Solution Approach 2:
The guiding means are positioned upstream of the axial opening to prevent piston slanting before it can cause blockage, proactively eliminating the risk of piston blockage rather than reacting to it
3Reliability
If the piston remains in the open position to prevent blockage, then piston blockage is avoided, but fuel overflow occurs through the blow hole
Solution Approach 1:
The system uses gas content detection as feedback to control piston position, automatically adjusting the axial pipe flow cross-section based on real-time fuel conditions, allowing the piston to close when gas content is low (preventing overflow) and open when gas content is high (preventing blockage)
4Productivity
If the flow of gas-enriched fraction is reduced when gas content is low, then productivity is improved, but the axial pipe must maintain large diameter for accident readiness
Solution Approach 1:
The axial pipe flow cross-section is made dynamic through piston movement, allowing the effective diameter to change from large (open position) to small (closed position), enabling the system to use a smaller pipe while maintaining the capability to handle high gas content accidents
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 effectively prevents piston blockage and fuel leakage, maintaining efficient operation by ensuring stable piston positioning and balanced flow, thus enhancing the overall performance of the degassing device.
Implementation Method 1
a piston (15) equipped with a diaphragm (16) in fluid communication with the axial opening (13). The piston (15) can be moved to the interior of the control chamber (12) according to an X axis direction between an open position of the output (14), when the amount of gas in the fraction of gas-enriched fuel flowing in the axial pipe (8) is high and a partially closed position of the output (14), when the amount of gas in the gas-enriched fraction of fuel flowing in the pipe (8) is low
Implementation Method 2
The piston (15) is subject to the action of a counter-spring (17) which tends to return it to the open position
Implementation Method 3
the control means comprise guiding means (18) making it possible to guide the moving piston (15) according to the X axis direction between the open and closed positions
Implementation Method 4
an atmospheric pressure separation tank (10) connected to the axial pipe (8) of the degassing container (6) in which the liquid fuel enclosed in the gas-enriched fraction is separated by gravity
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invent ion concerns a degassing device (1) for a fuel pumping assembly wit h a fuel distribution device comprising: a degassing container (6) fed wit h a liquid/gas fuel mixture delivered from t he output of a pump (4) and comprising an axial pipe (8) to evacuate a fraction of gas-enriched fuel, and control means ( 1 1) connected to the axial pipe (8) to make it possible to vary t he flow of the gas-enriched fraction sampled by this pipe as a function of its gas content, t he control means (11) comprising a piston (15) equipped with a diaphragm (16) in fluid communication wit h an axial opening (13) connected to the axial pipe (8). According t o t he invention, the control means ( 1 1) comprise guiding means ( 18) making it possible to guide the moving piston ( 1 5) according to the (X) axis direction between the open and closed posit ions.