High Pressure Pump Pulsation Damper Asymmetric Support
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Solution Overview
Problem
Traditional high pressure pumps with pulsation dampers face issues such as increased manufacturing costs, complex construction, and reduced fuel flow due to the need for precise alignment and large conical portions in support members, which complicates the fitting and alignment of diaphragms, leading to stress application and twisting forces.
Innovation Solution
The design incorporates upper and lower ring-shaped support members that abut on a cover member and pump body respectively, reducing the size of the support bodies and simplifying the construction, allowing for better fuel flow and easier fitting of the pulsation damper in the fuel chamber by preventing stress application to the welded portions and inhibiting diaphragm displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If end faces abutting on the peripheral edge portions of the diaphragms are formed in parallel to the peripheral edge portions in the upper support member and the lower support member, then the stress developed by the displacement of the diaphragm is prevented from being applied to the welded portion, but the working cost of the upper support member and the lower support member is increased
Solution Approach 1:
The invention changes the parallel configuration to an asymmetric configuration where the end faces are inclined relative to the peripheral edge portions. Specifically, the end faces are formed at an angle to the peripheral edge portions, creating a tapered or conical shape that reduces manufacturing complexity while still preventing stress concentration at the welded portion.
2Reliability
If the peripheral edge portions of the diaphragms are pressed over the entire circumference by the same load in the upper support member and the lower support member, then the stress developed by the displacement of the diaphragm is prevented from being applied to the welded portion, but an area of a conical portion connecting an end face with an end face abutting on the peripheral edge portion is made large, preventing the flow of the fuel in the fuel chamber
Solution Approach 1:
The invention applies local quality by creating a conical portion only at the specific location where the end face connects to the peripheral edge portion, rather than making the entire support member structure large. The conical portion is localized to the connection area, minimizing its impact on the overall fuel chamber flow path while still providing the necessary stress distribution function.
3Reliability
If the upper support member and the lower support member are fitted to the diaphragms in such a way that the center of the upper support member is aligned with the center of the lower support member, then a twisting force is prevented from being applied to the diaphragms, but the working accuracy and the fitting accuracy need to be improved, increasing the manufacturing cost
Solution Approach 1:
The invention introduces asymmetric features in the form of positioning protrusions and positioning grooves that provide self-alignment during assembly. These asymmetric positioning elements guide the upper and lower support members into correct alignment automatically, eliminating the need for high-precision manual alignment while still preventing twisting forces on the diaphragms.
4Reliability
If the upper support member and the lower support member are fitted to the diaphragms with precise center alignment, then a twisting force is prevented from being applied to the diaphragms, but the manufacturing tolerance needs to be decreased, increasing the manufacturing cost
Solution Approach 1:
The invention implements preliminary action by pre-forming positioning protrusions and positioning grooves on the support members during manufacturing. These positioning features are created in advance and automatically guide the assembly alignment, eliminating the need for tight manufacturing tolerances during the final assembly process. The positioning features perform the alignment function before the actual fitting occurs.
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 reduces manufacturing costs, improves fuel flow, and enhances the pulsation damping effect while simplifying the construction and alignment process, thereby elongating the pulsation damper's endurance and reducing fluid resistance.
Implementation Method 1
the upper ring-shaped part and the lower ring-shaped part can prevent a stress developed by a displacement of a diaphragm from being applied to a welded portion of the peripheral edge portion
Implementation Method 2
the two diaphragms are displaced according to a pressure change in the fuel chamber to thereby change the volume of the fuel chamber, whereby a pressure pulsation of the fuel is damped
Implementation Method 3
the size of the support body can be decreased and the flow of the fuel in the fuel chamber can be made better, and the pulsation damper can be fitted in the fuel chamber by a simple construction
Data Source
AI summary
A high-pressure pump has: a plunger; a pump body; a cover member for covering the pump body and forming a fuel chamber; a pulsation damper body constructed of upper and lower diaphragms with their peripheral edge portions joined and for reducing pressure pulsation in the chamber, the upper and lower diaphragms trapping gas having a given pressure between them; an upper support member having an upper ring-shaped part and an upper support body, the upper ring-shaped part being joined to the peripheral edge portion of the upper diaphragm, the upper support body extending from the upper ring-shaped part and abutting on the cover member; and a lower support member having a lower ring-shaped part and a lower support body, the lower ring-shaped part being joined to the peripheral edge portion of the lower diaphragm, the lower support body extending from the lower ring-shaped part and abutting on the pump body.