High-Pressure Pump Fluid Damper Membrane Pressure Pulsation
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Solution Overview
Problem
High-pressure pumps in fuel injection systems of internal combustion engines face challenges in damping pressure fluctuations and pulsations, particularly in the engine compartment, which can lead to reduced efficiency and durability.
Innovation Solution
A ring-shaped or cylindrical fluid damper membrane is integrated into the pump housing, arranged next to the inlet connection, allowing it to be acted upon by fluid pressure on both sides, reducing stress and increasing the membrane's lifespan by aligning it with the direction of pulsation propagation, and allowing for easy installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump working chamber is isolated from the engine room to prevent fluid mixing, then fluid purity is maintained, but pressure fluctuations and pulsations cannot be effectively damped
Solution Approach 1:
The pump housing is divided into separate chambers (engine room and pump working chamber) that are isolated from each other to prevent fluid mixing, while each chamber is equipped with its own dampener. The first dampener is located in the engine room and the second dampener is located in the pump working chamber, allowing independent damping of pressure fluctuations in each isolated space.
Solution Approach 2:
The patent introduces dampeners as intermediary devices that absorb and dampen pressure fluctuations and pulsations in both the engine room and pump working chamber. These dampeners act as mediators that reduce harmful pressure variations without requiring direct connection between the isolated chambers, thus maintaining fluid purity while effectively damping pressure fluctuations.
2Object-affected harmful factors
If a traditional dampener design is used, then pressure damping is achieved, but the membrane experiences high stress and reduced service life
Solution Approach 1:
The second dampener in the pump working chamber is specifically designed with a membrane that is acted upon by fluid pressure on both sides. This local design modification allows the membrane to experience balanced pressure forces, reducing stress concentration and extending service life while effectively damping pressure pulsations in the pump working chamber.
Solution Approach 2:
The patent changes the orientation of the membrane in the second dampener to be arranged longitudinally to the direction of pulsation propagation rather than transversely. This dimensional reorientation reduces the stress acting on the membrane by aligning it with the flow direction, thereby increasing membrane durability and service life.
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 dampens pressure fluctuations and pulsations, enhancing the durability and service life of the high-pressure pump by synchronizing pressure curves on both sides of the membrane and reducing stress on the membrane, thereby improving the pump's performance and maintenance intervals.
Implementation Method 1
the membrane is acted upon on both sides by the fluid pressure prevailing in the damper chamber. This enables the membrane to work ideally, in that the pressure curves on both sides of the membrane are synchronous
Implementation Method 2
the fluid damper is a membrane. This membrane is ring-shaped or cylindrical and has two opposing annular end faces which enclose an inner membrane chamber and can be moved in relation to one another
Data Source
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AI summary
The invention relates to a high-pressure pump, having a pump housing (2), on which a pump cylinder head (4) having a a pump cylinder (3) is arranged, wherein a pump push rod (26) is arranged in a pump cylinder guide (27) of the pump cylinder (3), which pump push rod interacts with a pump working chamber (36) and with a drive unit compartment (8) arranged in the pump housing (2), and wherein the pump working chamber (36) is fluidically connected to the drive unit chamber (8) by means of an electromagnetically actuatable suction valve (6) and the high-pressure pump has a fluid damper. According to the invention, a high-pressure pump is provided which is improved with respect to damping of the pressure fluctuations or pressure pulsations of a fluid to be conveyed. This is achieved in that the fluid damper is designed as at least one membrane (38a, 38b), which is inserted into a damper chamber (19) recessed into the pump housing (2).