Membrane-Spring Pressure Damping for Compact Fluid Circuits
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Solution Overview
Problem
Current pressure damping devices for fluid circuits, particularly in high-pressure fuel systems, face limitations in efficiently attenuating pressure peaks while maintaining a compact design and operating effectively across varying temperatures and pressures.
Innovation Solution
A pressure damping device with a single-piece body and an elastically deformable membrane supported by a central member and a spring, optimized for maximum membrane deformation, allowing for efficient damping of pressure peaks through a combination of membrane and spring deformation, while maintaining a compact and autonomous design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is added to the cavity to improve pressure damping in high-pressure circuits, then pressure damping capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the spring element with the membrane structure to form an integrated pressure damping system. The spring is positioned within the cavity and works in conjunction with the membrane to provide enhanced pressure damping capability while maintaining a unified structural design that minimizes overall complexity.
Solution Approach 2:
The spring is nested within the cavity space, utilizing the available volume efficiently. This nesting approach allows the spring to be housed within the existing structure without requiring additional external space, thereby improving pressure damping functionality while avoiding significant increases in device footprint or structural complexity.
2Reliability
If the membrane deformability is increased to improve pressure attenuation, then pressure damping is improved, but structural strength decreases
Solution Approach 1:
The patent employs composite material construction for the membrane, combining materials with different properties to achieve optimal balance between deformability and strength. The membrane structure integrates materials that provide both the necessary elastic deformation capability for pressure attenuation and sufficient mechanical strength to withstand operating pressures without failure.
Solution Approach 2:
The membrane is designed with varying local properties - the central portion has higher deformability to maximize pressure attenuation, while the peripheral portion maintains greater strength for structural integrity and sealing. This gradient in material properties or thickness allows the membrane to simultaneously achieve both pressure damping effectiveness and structural reliability.
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 device effectively reduces noise and pressure variations in fluid circuits by optimizing membrane deformation and spring compression, enabling operation at low and high pressures with reduced overall dimensions and temperature resilience.
Implementation Method 1
The elastic deformation capability of the membrane allows to attenuate the pressure peaks of fuel flowing through the chamber from the inlet port towards the outlet port
Implementation Method 2
When a damping device is intended for equipping a high-pressure circuit, it usually also comprises a spring which is housed in the cavity of the cover and which is supported on the membrane by means of a cup
Data Source
AI summary
A pressure damping device for a fluid circuit includes a lower body having a fluid inlet port and a fluid outlet port. An upper cover attaches to the body. An elastically deformable membrane is interposed between the body and the cover, and a circular cup is arranged on the membrane. A spring is interposed between the cup and a bottom of the cover. The body includes a support member for supporting the membrane, with the support member projecting from the first bottom and including a free upper end on which the membrane is adapted to be supported.