High-Pressure Fuel Pump Flat Valve Circumferential Flow Noise Reduction
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Solution Overview
Problem
High-pressure fuel supply pumps experience noise issues due to valve body-circumferential flow, leading to pressure pulsations and fluttering, which are amplified and propagated as noise through the piping system.
Innovation Solution
A high-pressure fuel supply pump design featuring a flat valve with a liquid damper chamber between the valve body and housing, including tubular passages to manage circumferential flows, reducing the impact of noise caused by valve body-circumferential flow by distributing and dampening the flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flat valve is used to achieve linear relationship between axial displacement and discharge amount, then the discharge flow rate can be increased, but the axial displacement must be increased which causes larger differential pressure force and fluttering
Solution Approach 1:
The patent introduces a circumferential flow as an intermediary mechanism to redistribute the axial flow energy. The circumferential flow passage redirects the axial flow to generate a rotating flow pattern that reduces direct impact on the valve body, thereby mitigating fluttering while preserving discharge flow rate capability
Solution Approach 2:
The patent changes the flow direction parameter by introducing a circumferential component to the originally axial flow. This parameter change transforms the flow from a direct axial impact pattern to a combined circumferential-axial pattern, reducing the differential pressure force and fluttering while maintaining discharge effectiveness
2Productivity
If the valve body is radially offset from the center of the valve body housing to increase discharge flow rate, then a larger discharge area is achieved, but a significant difference in sectional area is produced causing increased differential pressure force and fluttering
Solution Approach 1:
The patent deliberately creates an asymmetric flow pattern by introducing circumferential flow in addition to axial flow. This asymmetric flow distribution allows the valve to handle larger discharge rates while the circumferential component helps equalize pressure distribution, reducing fluttering caused by radial offset
3Object-affected harmful factors
If hydraulic dampers or sound insulation materials are added to absorb pressure pulsations and noise, then noise reduction is achieved, but space and cost increase
Solution Approach 1:
The patent merges the noise reduction function with the existing valve structure by integrating the circumferential flow passage into the valve body and housing. This combines the flow management and noise reduction functions in a single integrated structure, avoiding additional space and cost requirements
Solution Approach 2:
The circumferential flow passage serves multiple functions: it manages flow distribution to reduce fluttering, controls pressure pulsations, and reduces noise. This multi-functionality eliminates the need for separate hydraulic dampers or sound insulation materials, saving space and cost
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 noise and pressure pulsations by managing circumferential flows, minimizing the differential pressure force on the valve body and suppressing fluttering, thereby enhancing the operational efficiency and noise reduction of the fuel supply system.
Implementation Method 1
a liquid damper chamber defined between an outer circumference of the seat member and an outer circumference of the valve body and an inner circumference of the valve body housing to face the circumferential flow
Data Source
AI summary
A high-pressure fuel supply pump includes a discharge valve, which is a non-return valve between a pressurizing chamber and a discharge port. The discharge valve includes a valve body housing, a discharge valve spring, a valve body and a seat member. The discharge valve is a flat valve. When the valve is opened, a flow of fuel moving from the pressurizing chamber and axially colliding with the valve body is radially distributed in the radial direction of the valve body to become a flow directly moving the discharge ports and a flow colliding with an inner wall of the valve body housing before moving toward the discharge ports and then in a circumferential direction of the valve body.