High-Pressure Pump Valve Sleeve for Self-Closing Suppression
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Solution Overview
Problem
Conventional high-pressure pumps experience a self-closing phenomenon during the metering stroke due to dynamic pressure of fuel being applied to tapered surfaces, leading to inefficiencies and potential noise vibrations.
Innovation Solution
A high-pressure pump design featuring a cylindrical sleeve that covers the tapered surface of the valve, restricting dynamic pressure application and preventing self-closing, while allowing for reduced weight and improved response by enlarging the tapered surface area and minimizing the contact surface diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the valve has a tapered surface for self-closing function, then the valve can close automatically using dynamic pressure, but the self-closing phenomenon causes inefficiencies and noise vibrations during metering stroke
Solution Approach 1:
The harmful tapered surface is extracted and removed from the valve design. The patent replaces the conventional tapered surface with a cylindrical surface, eliminating the source of the self-closing phenomenon while preserving the valve's essential closing function through alternative means.
Solution Approach 2:
The geometric parameter of the valve surface is changed from tapered to cylindrical. This parameter change fundamentally alters how dynamic pressure acts on the valve, preventing the self-closing phenomenon while maintaining adequate valve closing through pressure differential and spring force.
2Speed
If the contact surface diameter is reduced to improve valve response, then the valve response speed increases, but the valve may become unstable or difficult to control
Solution Approach 1:
The contact surface geometry is optimized by using a cylindrical surface with carefully selected diameter parameters. The patent specifies that the contact surface diameter should be within a particular range to achieve both fast response and stable control, balancing the competing requirements through parameter optimization.
3Weight of moving object
If the tapered surface area is enlarged to reduce weight, then the valve weight decreases and response improves, but the manufacturing complexity increases
Solution Approach 1:
Instead of enlarging a tapered surface to reduce weight, the patent inverts the approach by using a cylindrical surface geometry that naturally reduces material usage and weight while simplifying manufacturing. The cylindrical shape is easier to manufacture than a tapered surface while achieving the weight reduction goal.
Solution Approach 2:
The valve geometry parameters are optimized by adopting a cylindrical surface with specific dimensional parameters that minimize weight while maintaining structural integrity and ease of manufacture. The patent provides specific parameter ranges for the cylindrical surface dimensions.
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 prevents self-closing phenomena, enhances valve response, reduces noise vibrations, and improves fuel economy by minimizing control current requirements.
Implementation Method 1
the dynamic pressure of fuel is applied to a tapered surface, which may cause a self-closing phenomenon
Data Source
AI summary
A high-pressure pump has a metering valve and a valve stopper. The stopper has a regulation portion which an end surface of the valve is brought into contact with. An outer diameter of the regulation portion is equal to an outer diameter of the outer peripheral surface of the valve. A cylindrical sleeve is disposed around the regulation portion. When the end surface of the valve is in contact with the regulation portion, the sleeve covers a tapered surface of the valve.