Diaphragm Damper Resonance Damping via Nested Elastic Projections
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Solution Overview
Problem
Conventional diaphragm dampers in high-pressure pumps either obstruct fuel flow or complicate the structure, making it difficult to optimize pulsation reduction and resonance frequency management, leading to inefficient pulsation absorption and potential abnormal noise due to resonance.
Innovation Solution
A diaphragm damper with a rubber-like elastic member arranged within the high-pressure chamber, featuring discoid sheet portions and circumferentially arranged rubber projections that contact discoid metal diaphragms, allowing for volume change adjustment and effective resonance damping without obstructing fuel flow or altering the conventional metal diaphragm structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic member is used to support a metal diaphragm, then the diaphragm is supported, but the elastic member occupies space and blocks fuel flow within the fuel chamber
Solution Approach 1:
The elastic member is nested within the high-pressure chamber, utilizing the space between the piston and the diaphragm assembly. This nesting approach allows the elastic member to support the diaphragm without obstructing the fuel flow path in the fuel chamber, as it is positioned in a different spatial zone (high-pressure chamber rather than fuel chamber).
Solution Approach 2:
The invention transitions the elastic member from a two-dimensional flat structure to a three-dimensional volumetric structure with radial projections extending in multiple directions. This dimensional change allows the elastic member to provide support while occupying minimal space in the critical fuel flow path, as the projections distribute the support function across multiple spatial dimensions.
2Reliability
If a rubber-like elastic member and wave washer are used to support the outer peripheral portion of the metal diaphragm, then the diaphragm is supported, but the structure becomes complicated and the components have reduced degree of freedom in shapes
Solution Approach 1:
The invention merges the wave washer and elastic member into a single integrated elastic member structure. The radially extending projections directly provide both the support function and the necessary flexibility, eliminating the need for separate wave washer and elastic member components. This consolidation reduces structural complexity while maintaining the diaphragm support function.
Solution Approach 2:
The elastic member with radial projections serves multiple functions simultaneously: it supports the diaphragm, absorbs pulsation, dampens resonance, and maintains sealing. This multi-functionality eliminates the need for separate specialized components like wave washers, thereby reducing overall structure complexity while achieving comprehensive diaphragm support.
3Reliability
If the diaphragm damper structure is optimized for pulsation reduction, then pulsation is reduced, but it becomes difficult to optionally set the amount of volume change based on resonance frequency and pressure
Solution Approach 1:
The elastic member is designed with inherent dynamic characteristics through its radial projections, which allow the structure to adapt its volume change behavior based on operating conditions. The projections can deform elastically in response to varying pressure and resonance frequency, enabling the damper to optimize its pulsation reduction performance across different operating scenarios without requiring structural modifications.
Solution Approach 2:
The invention enables parameter changes by designing the elastic member with specific geometric parameters (projection height, radial distance, thickness) that can be adjusted to change the volume change characteristics. These parameter variations allow the damper to be tuned for different resonance frequencies and pressure conditions while maintaining effective pulsation reduction, providing adaptability without compromising performance.
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 dampens resonance and optimizes diaphragm performance by maintaining fuel flow space and allowing adjustable volume changes based on resonance frequency and pressure, reducing pulsation and noise without inhibiting metal diaphragm deformation.
Implementation Method 1
a rubber-like elastic member (2) arranged within the high-pressure chamber (11)
Implementation Method 2
the rubber-like elastic member is constructed by a discoid sheet portion (25, 26) which is provided so as to come into contact with each of two discoid metal diaphragms (1, 1), and a plurality of rubber projections (251, 261) which are arranged circumferentially between the sheet portions (25, 26)
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The objective of the present invention is to provide a diaphragm damper with which the amount of volume change due to the resonance frequency and pressure can be set freely and the performance of the diaphragm damper can be optimized, without changing the attachment structure for a conventional metal diaphragm and without obstructing the space where fuel flows in a fuel chamber. To this end, this diaphragm damper, wherein a high-pressure gas is enclosed in a high-pressure chamber formed by two disk-shaped metal diaphragms the outer circumferential portions of which have been joined together, is constructed such that rubber-like elastic members are arranged within the high-pressure chamber.