Fuel System Vibration Dampener Using Piston and Gas Pressure
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Solution Overview
Problem
Existing fuel feed systems in piston engines experience pressure vibration issues, leading to cavitation in low-pressure pipes, particularly severe when using crude oil, and existing dampeners have limited service life due to membrane or spring failures.
Innovation Solution
A vibration dampener with a body part containing a movably arranged intermediate piece, connected to the fuel feed system on one side and a pressurized gas source on the other, utilizing a one-way valve and pressure regulation valve to maintain desired gas pressure, allowing gas flow into the system while preventing backflow, and featuring annular seals to prevent fuel and gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas dampener with a membrane is used to dampen pressure vibration, then the pressure vibration is dampened, but the service life is limited due to membrane breakage
Solution Approach 1:
The invention extracts and removes the membrane component from the dampener system. Instead of using a membrane to separate gas and fuel, the patent uses a piston with seals, eliminating the membrane's weakness and extending service life while maintaining the pressure vibration dampening function.
Solution Approach 2:
The invention replaces the membrane-based mechanical system with a piston-and-seal mechanical system. The piston with annular seals provides a more durable mechanism for separating gas and fuel chambers, eliminating the membrane breakage issue while achieving the same dampening effect.
2Reliability
If a mechanical dampener with springs is used to dampen pressure vibration, then the pressure vibration is dampened, but the service life is limited by spring durability
Solution Approach 1:
The invention extracts and removes the spring component from the dampener system. The dampening function is achieved through the compressible gas pressure acting on the piston, eliminating springs and their associated durability limitations while maintaining effective vibration dampening.
Solution Approach 2:
The invention replaces the spring-based mechanical dampening system with a gas-pressure-based system. The compressible gas provides the restoring force previously supplied by springs, eliminating wear and durability issues while achieving the same dampening performance.
3Reliability
If gas pressure is increased to improve dampening效果, then the dampening effectiveness is improved, but the load on the gas system increases
Solution Approach 1:
The invention applies different pressure levels to different sides of the piston. The first side (fuel side) operates at high pressure from the fuel system, while the second side (gas side) operates at lower pressure from the gas source. This local pressure differentiation achieves effective dampening while reducing the overall gas system load.
Solution Approach 2:
Instead of using high gas pressure to counteract high fuel pressure, the invention inverts the approach by using the existing high fuel pressure to balance against lower gas pressure. The area ratio of the piston surfaces is designed so that lower gas pressure on the larger area can balance the higher fuel pressure on the smaller area, reducing gas system load while maintaining dampening effectiveness.
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 provides a durable and reliable dampening system without membranes or mechanical springs, allowing adjustable dampening properties through gas pressure, reducing load on the gas system and simplifying design, effectively mitigating pressure vibrations and preventing cavitation.
Implementation Method 1
The gas pipe is provided with a one-way valve allowing flow therethough from the gas source to the space, but preventing flow from the space to the gas source
Implementation Method 2
The gas pipe is provided with a pressure regulation valve for maintaining a desired gas pressure in the part of the gas pipe between the pressure source and the one-way valve
Implementation Method 3
The movement of the piston causes the increase of the pressure of the fuel. The cylinder element usually includes one or two inlet channels through which fuel is introduced from the low pressure side of the fuel feed system into a pressure plenum as the piston is in its bottom dead center
Implementation Method 4
At least one annular seal is arranged around the intermediate piece for preventing fuel and gas from passing between the intermediate piece and the body part
Implementation Method 5
A vibration dampener with a body part containing a movably arranged intermediate piece, connected to the fuel feed system on one side and a pressurized gas source on the other, utilizing a one-way valve and pressure regulation valve to maintain desired gas pressure
Data Source
Figure 1
Figure 2
AI summary
An arrangement for dampening the pressure vibration of a fuel feed system (1 ) of a piston engine, the arrangement comprising a vibration dampener (11) having a body part (12) inside which is a space (13) containing a movably arranged intermediate piece (16), a first opening (14) arranged to open in the space (13) on the first side of the intermediate piece (16) for connecting the space (13) with the fuel feed system (1 ), and a second opening (15) arranged to open into the space (13) on the second side of the intermediate piece (16), the second opening (15) being in flow connection with a gas source (22) comprising pressurized gas.