High-Pressure Pump Guide Portion Stabilizes Valve Against Vortex Flow
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Solution Overview
Problem
Conventional high-pressure pumps for internal combustion engines face issues with pressure regulation in fuel rails, leading to potential damage, fuel leakage, and inefficient fuel injection due to inadequate oil tightness and manufacturing complexities in existing pressure relief and constant residual pressure valve configurations.
Innovation Solution
A high-pressure pump design incorporating a pressurizing unit, discharging unit, return flow channel, mechanical pressure relief valve, cup-like shaped spring seat, and constant residual pressure valve, which includes a tubular relief valve element and spring seat to manage fuel pressure and prevent vortex flow, ensuring stable operation and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the constant residual pressure valve is opened to maintain appropriate fuel pressure, then fuel pressure regulation is improved, but oil tightness becomes insufficient due to vortex flow causing opening/closing body instability
Solution Approach 1:
A guide portion is introduced as an intermediary structure between the opening/closing body and the valve seat. This guide portion stabilizes the opening/closing body by guiding its movement path, preventing lateral displacement caused by vortex flow, and ensuring proper engagement with the valve seat for adequate oil tightness while maintaining pressure regulation functionality.
Solution Approach 2:
The guide portion is designed to pre-stabilize the opening/closing body before it reaches the valve seat. By providing a guided path in advance, the vortex flow's destabilizing effect is counteracted before it can cause improper seating, ensuring the opening/closing body engages correctly with the valve seat.
2Ease of operation
If the opening/closing body is designed to open the valve passage, then fuel pressure control is achieved, but vortex flow is generated causing instability and insufficient oil tightness
Solution Approach 1:
The guide portion acts as a mediator that stabilizes the opening/closing body during its operation. It provides a constrained path for the opening/closing body to follow, preventing it from becoming unstable due to vortex flow while still allowing it to perform its function of opening the valve passage when needed.
3Volume of moving object
If the constant residual pressure valve is positioned within the valve element, then pump size is reduced, but machining difficulty increases and manufacturing cost rises
Solution Approach 1:
The valve structure is segmented into distinct components: the valve element, the spring seat with its recess, and the opening/closing body. The constant residual pressure valve is positioned within the spring seat's recess rather than deeply within the valve element, which simplifies machining by providing better tool access while maintaining the compact integrated design that reduces overall pump size.
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 regulates fuel pressure in the fuel rail, preventing damage and leakage, maintaining appropriate fuel conditions, and reducing manufacturing complexities while enhancing the stability and efficiency of the pump's operation.
Implementation Method 1
a relief urging member that applies elastic force to the relief valve element in a direction for closing the return flow channel
Implementation Method 2
a constant residual pressure urging member that applies elastic force to the constant residual pressure valve element in a direction for closing the return flow channel
Implementation Method 3
the guide portion limits a vortex flow generated at a position downstream of the constant residual pressure valve element
Data Source
AI summary
A high-pressure pump for supplying fuel to a fuel rail includes a pressurizing unit, a discharging unit, a return flow channel, a mechanical pressure relief valve, a cup-like shaped spring seat, and a constant residual pressure valve. The return flow channel is closed when pressure of fuel in the fuel rail becomes equal to or less than a predetermined pressure. The spring seat has a guide portion that is formed along an outer shape of a constant residual pressure valve element of the constant residual pressure valve such that the guide portion limits a vortex flow generated at a position downstream of the constant residual pressure valve element in the second flow direction.