High-Pressure Pump Valve Integration for Leakage Reduction
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Solution Overview
Problem
High-pressure fuel pumps for diesel engines face efficiency issues due to unintended leakage at high pressures, which increases the need for precision parts and higher costs, as maintaining sealed interfaces becomes more challenging with higher pressures.
Innovation Solution
The design includes a housing with a head and control valve assembly, where the valve element is directly received within the head, reducing the number of sealing interfaces exposed to high pressure and eliminating the need for additional parts, thereby minimizing the reliance on precision machining and costly components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sealing interfaces are included to prevent leakage at high pressure, then leakage prevention is improved, but manufacturing cost and device complexity increase due to the need for precision parts
Solution Approach 1:
The valve body and cylinder bore are merged into a single integrated component, eliminating the separate valve body part and its associated sealing interface. This reduces the number of parts from multiple components to a unified structure, thereby reducing both device complexity and manufacturing cost while maintaining the necessary sealing function through the reduced number of interfaces.
2Reliability
If multiple sealing interfaces are included to prevent leakage at high pressure, then leakage prevention is improved, but manufacturing precision requirements increase
Solution Approach 1:
By integrating the valve body and cylinder bore into one component, the patent eliminates the need for precise alignment between separate parts. The sealing interface is now part of a unified structure, significantly reducing manufacturing precision requirements while maintaining effective leakage prevention at high pressures.
3Reliability
If more precision parts are used to maintain sealed interfaces at high pressure, then leakage prevention is improved, but manufacturing cost increases
Solution Approach 1:
The integration of valve body and cylinder bore into a single component reduces the number of precision parts required. This merging eliminates the need for multiple high-precision sealing interfaces between separate components, thereby reducing manufacturing cost while maintaining reliable sealing performance under high pressure conditions.
4Device complexity
If the valve element is directly received within the head, then device complexity is reduced, but sealing performance may worsen due to fewer sealing interfaces
Solution Approach 1:
The direct reception of the valve element within the head, achieved through merging the valve body and cylinder bore into one component, reduces device complexity while maintaining sealing performance. The unified structure eliminates potential leak paths at interfaces between separate parts, and the single integrated sealing interface is optimized to provide reliable high-pressure sealing.
Data Source
AI summary
The pump described herein provides a potentially lower cost alternative to conventional high-pressure pumps by providing a head, a plunger, and a control valve assembly. The head defines a valve bore having a first diameter, a plunger bore having a second diameter, and an intermediate chamber having a third diameter. The plunger is configured to reciprocate within the plunger bore. The plunger, the plunger bore, and the intermediate chamber at least partially define a pumping chamber. The control valve assembly is coupled to the head and includes an actuator moveable in response to an input signal and a valve element coupled to the actuator. The valve element is received within the valve bore and moveable between an open and a closed position. The valve element includes a body having a fourth diameter and a valve head having a fifth diameter. The first diameter is no larger than the second diameter.