Common Rail Fuel Pump Check Valve Retainer for 30,000 PSI Pressure
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Solution Overview
Problem
Modern fuel systems face challenges in increasing service pressure of fuel pumps due to enhanced stresses and thermal effects, limiting pump outlet pressures and increasing manufacturing costs, especially for outlet check valves operating at pressures exceeding 30,000 pounds per square inch.
Innovation Solution
The design incorporates a pumping element with a check valve system comprising movable inserts and a spring mechanism, where the first insert moves from a sealing position to a flow-permitting position in response to pressurized fluid, and a retainer system providing an interference fit to withstand high pressures, allowing for efficient fluid flow and retention within flow chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If outlet check valves are designed to withstand pressures exceeding 30,000 PSI, then pump outlet pressure capability is improved, but manufacturing costs increase and material selection becomes more limited
Solution Approach 1:
The outlet check valve is divided into multiple components: a valve body, a movable insert (plug), and a retainer. This segmentation allows each component to be manufactured using appropriate processes for its specific functional requirements, reducing overall manufacturing complexity and cost while maintaining the capability to withstand high pressures exceeding 30,000 PSI.
Solution Approach 2:
The valve employs composite construction with different materials optimized for specific functions: the retainer provides structural support and pressure containment, the insert provides sealing surfaces, and spring steel is used for the biasing spring. This composite approach enables the valve to withstand high outlet pressures while using cost-effective materials and manufacturing processes for each component.
2Stress or pressure
If outlet check valves are designed to withstand pressures exceeding 30,000 PSI, then pump outlet pressure capability is improved, but thermal load on components increases
Solution Approach 1:
By segmenting the valve into a retainer, insert, and spring assembly, heat generated under high pressure conditions is distributed across multiple components rather than concentrated in a single part. The spring component provides thermal compliance and allows for thermal expansion without compromising the sealing function, thereby managing thermal load while maintaining pressure capability.
Solution Approach 2:
The spring acts as an intermediary element between the insert and retainer, providing a compliant connection that accommodates thermal expansion and contraction. This intermediary component absorbs thermal stresses and prevents direct thermal loading between the sealing surfaces, enabling the valve to operate at high pressures while managing thermal effects.
3Stress or pressure
If a retainer system with interference fit is used, then high pressure retention is improved, but device complexity increases
Solution Approach 1:
The retainer system is segmented into an outer retainer component and an inner insert, with the interference fit occurring at their interface. This segmentation allows the complex interference fit feature to be localized to a specific interface rather than requiring complexity throughout the entire valve structure. The retainer provides pressure containment while the insert provides sealing, with the interference fit ensuring proper assembly and retention under high pressure conditions.
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
This design enhances the performance and durability of outlet check valves, enabling higher pump outlet pressures while reducing manufacturing costs and meeting or exceeding performance standards, thus addressing the limitations of current fuel pump designs.
Implementation Method 1
a spring having a first end engaging the first insert and a second end engaging the second insert; wherein the first insert moves from the first position to the second position against a biasing force of the spring
Implementation Method 2
the first insert forms a seal that inhibits fluid flow between the first and second flow chambers
Implementation Method 3
the second insert is retained in a fixed position by an interference fit with the second flow chamber
Data Source
AI summary
A pumping element comprises a first flow chamber; a second flow chamber in fluid connection with the first flow chamber, the second flow chamber including a shoulder; a check valve including a first insert and a second insert, the first insert being movable between a first position wherein the first insert forms a seal that inhibits fluid flow between the first and second flow chambers and a second position wherein the first insert permits fluid flow between the first and second flow chambers, the second insert being inserted into the second flow chamber to an extent limited by the shoulder; and a spring having a first end engaging the first insert and a second end engaging the second insert; wherein the first insert moves from the first position to the second position against a biasing force of the spring in response to pressurized fluid in the first flow chamber.