High-Pressure Pump Fuel Gallery Pulsation Damper Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-pressure pumps for internal combustion engines face inefficiencies in fuel suction due to insufficient fuel filling in the compression chamber during the suction stroke and inadequate attenuation of pressure pulsations, leading to potential fuel leakage and noise generation.
Innovation Solution
A high-pressure pump design featuring a fuel gallery with a pulsation damper supported by first and second annularly shaped supporting members, creating inner and outer fuel chambers that communicate through a restriction, slowing fuel flow velocity and prolonging pressure pulsation reduction, thereby restricting pressure pulsation transmission and enhancing fuel suction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the plunger reciprocates at high speed during the suction stroke, then the engine speed increases and power output improves, but the fuel supplied through the inlet does not fill the compression chamber enough
Solution Approach 1:
The fuel supply system is segmented into multiple sources: the traditional inlet supply and a new direct supply from the fuel gallery through the suction opening. This segmentation allows the compression chamber to receive fuel from both sources simultaneously, ensuring sufficient fuel quantity even at high reciprocation speeds.
Solution Approach 2:
Fuel is preliminarily supplied to the fuel gallery through the inlet before the compression chamber needs fuel. The fuel gallery acts as a pre-filled reservoir, allowing the compression chamber to access fuel directly through the suction opening when needed, ensuring adequate fuel supply during high-speed operation.
2Object-affected harmful factors
If a pulsation damper is added to reduce pressure pulsation, then pressure pulsation attenuation improves, but the device complexity increases
Solution Approach 1:
The pulsation damper is merged with the fuel gallery structure, combining the pulsation attenuation function with the existing fuel storage and distribution system. This integration reduces overall device complexity by eliminating the need for separate, standalone pulsation dampers while still achieving effective pressure pulsation reduction.
Solution Approach 2:
The fuel gallery serves multiple functions: it stores fuel, distributes fuel to the compression chamber, and acts as a pulsation damper. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while maintaining pressure pulsation attenuation capability.
3Productivity
If the fuel flow velocity in the fuel gallery is high, then fuel supply efficiency improves, but the pressure pulsation is not attenuated sufficiently and fuel leaks from inlet to low-pressure fuel pipe
Solution Approach 1:
The fuel flow path is segmented into distinct zones: high-velocity flow in the inlet section for efficient supply, and low-velocity flow in the fuel gallery section for pulsation attenuation. The suction opening is positioned to access fuel from the low-velocity zone, ensuring both efficient supply and adequate attenuation.
Solution Approach 2:
Different regions of the fuel gallery have different flow characteristics: the inlet area experiences high flow velocity for efficient fuel supply, while the fuel gallery interior maintains lower velocity to allow pulsation attenuation. This local differentiation of flow quality enables both objectives to be achieved simultaneously.
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 design effectively reduces pressure pulsations and improves fuel suction efficiency, minimizing fuel leakage and noise, ensuring stable operation across varying engine speeds.
Implementation Method 1
The inner fuel chamber and the outer fuel chamber communicate with each other through a restriction provided in the second supporting member. When the fuel discharged from the suction opening flows between the inner fuel chamber and the outer fuel chamber, its flow velocity is decreased by the restriction.
Implementation Method 2
a pulsation damper is supported in the fuel gallery by a first and a second supporting member... the pressure pulsation transmitted to an outside member through the inlet opening can be restricted
Data Source
AI summary
A fuel gallery has an inlet opening through which a fuel is introduced therein and a suction opening through which the fuel flows between the fuel gallery and a compression chamber. A pulsation damper is supported in the fuel gallery by a first and a second supporting member. The second supporting member defines an inner fuel chamber and outer fuel chamber which communicates with each other through apertures. The suction opening is located at a side wall of the fuel gallery and the inlet opening is located at a bottom wall of the inner fuel chamber which is defined radially inside of the second supporting member. The fuel discharged into the outer fuel chamber through the suction opening is introduced into the inner fuel chamber through the apertures. A flow velocity of the fuel is decreased and a pressure pulsation reduction effect of the pulsation damper is surely achieved.