High temperature fluid isolator with large dynamic displacement capability
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Solution Overview
Problem
Existing vibration isolation technologies face challenges in preventing damping effects, which are detrimental to effective vibration isolation, and often rely on elastomeric spring elements that degrade under dynamic pressure and high temperatures.
Innovation Solution
The design of a fluid-based vibration isolator that eliminates elastomeric spring elements, utilizing a dynamic fluid chamber and non-dynamic fluid chambers to isolate dynamic pressure from the spring element, and employs metallic flexures to maintain stiffness without damping, ensuring reliable sealing and high-temperature tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric spring elements are used for vibration isolation, then vibration damping is provided, but damping effects are detrimental to effective vibration isolation and the elastomeric elements degrade under dynamic pressure and high temperatures
Solution Approach 1:
The patent removes elastomeric spring elements from the system entirely, replacing them with a fluid-based isolation mechanism. The fluid isolator uses a piston moving within a cylinder to create isolation, eliminating the need for elastomeric materials that degrade under dynamic pressure and heat, thus resolving the contradiction between providing isolation and avoiding detrimental damping
Solution Approach 2:
The patent employs a hydraulic system where fluid pressure changes during piston movement provide the isolation mechanism. The fluid is forced through restricted orifices during piston displacement, creating pressure differentials that isolate vibrations without the damping effects of elastomeric materials, while maintaining reliability under high-temperature conditions
2Reliability
If dynamic pressure is applied to seals, then vibration isolation performance is enhanced, but seal reliability deteriorates under high dynamic pressure
Solution Approach 1:
The patent divides the fluid chamber into multiple sealed compartments using pistons with integrated seals. Each seal only experiences pressure differentials across its immediate interface rather than the full system pressure, distributing the stress and improving seal durability while maintaining isolation performance
Solution Approach 2:
The piston acts as an intermediary between the dynamic external forces and the seals. The piston absorbs and transmits forces through its structure, protecting the seals from direct exposure to peak dynamic pressures while still allowing the fluid pressure changes needed for isolation
3Strength
If metallic flexures are used to maintain stiffness, then structural rigidity is improved, but device complexity increases
Solution Approach 1:
The patent uses metallic flexures with bellows-like structures that provide controlled flexibility in specific directions while maintaining overall structural stiffness. These flexures allow thermal expansion and contraction while maintaining the required structural integrity, achieving the balance between rigidity and complexity through geometric design rather than material complexity
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 achieves improved service life, reduced dynamic pressure on seals, enhanced reliability, and effective vibration isolation by preventing damping effects and maintaining performance in high-temperature environments, with the ability to generate high dynamic pressures while isolating static seals from dynamic pressure.
Implementation Method 1
fluid inertial isolators configured to generate high dynamic pressures while isolating static seals from the resulting dynamic pressure
Implementation Method 2
movement of the piston within the housing produces a dynamic seal between the exterior surface of the piston and the interior wall of the housing
Data Source
AI summary
The present disclose describes a fluid isolator mount. The mount provides a long service life under high temperatures and large dynamic displacements. The mount utilizes metallic flexures and dynamic fluid chambers. The mount provides vibration isolation at selected frequencies while precluding damping effects.