Relief Valve in Liquid Sealed Vibration Isolator
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Solution Overview
Problem
Existing liquid sealed vibration isolating devices face challenges in effectively reducing noise caused by cavitation phenomena due to negative pressure in primary liquid chambers, leading to incomplete sealing and decreased damping performance, especially under varying vibration amplitudes.
Innovation Solution
A liquid sealed vibration isolating device with a partition member featuring a leak hole and a relief valve that opens and closes to control hydraulic liquid flow between the primary and secondary liquid chambers, incorporating an elastic diaphragm and a frame member with a thick wall portion to arrest diaphragm rotation and maintain constant positional relationships, ensuring efficient noise reduction and damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lid portion is elastically deformed to short circuit the orifice passage, then the cavitation phenomenon is relieved, but the relief amount is insufficient due to throttling by the communication port
Solution Approach 1:
The partition member is divided into a rigid portion and an elastic portion, with the relief valve specifically formed in the rigid portion. This segmentation allows the relief valve to provide a dedicated, unthrottled passage for hydraulic liquid flow, independent of the orifice passage throttling mechanism, thereby ensuring sufficient relief amount while maintaining cavitation relief effectiveness.
2Reliability
If the elastic diaphragm is deformed by minute vibration, then the seal works incompletely causing leakage, but damping performance decreases
Solution Approach 1:
The partition member is segmented into rigid and elastic portions. The rigid portion containing the relief valve provides stable, vibration-resistant sealing that prevents leakage during minute vibrations, while the elastic portion maintains its damping function. This segmentation resolves the contradiction by separating the sealing function from the damping function.
3Adaptability or versatility
If the elastic diaphragm is rotatively moved by continuous large amplitude vibration, then positional slippage occurs between relief valve and leak passage, but cavitation prevention is compromised
Solution Approach 1:
The partition member is divided into rigid and elastic portions. The relief valve is formed in the rigid portion which maintains constant positional relationship with the leak passage, preventing rotational slippage even during continuous large amplitude vibrations. The elastic portion absorbs vibrations without affecting the positional stability of the relief valve.
Solution Approach 2:
The relief valve function is extracted from the elastic diaphragm and placed in the rigid portion of the partition member. This extraction ensures that the relief valve operates independently of the elastic deformation and rotational movement of the diaphragm, maintaining reliable positional stability while preserving vibration absorption capabilities.
4Speed
If a relief valve structure without orifice passage involvement is used, then instant relief is achieved, but the structure becomes more complex
Solution Approach 1:
The relief valve is merged with the partition member structure itself, formed as an integral component in the rigid portion. This integration achieves instant relief capability without requiring separate orifice passages or additional throttling mechanisms, thereby maintaining fast relief speed while avoiding increased structural 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 effectively prevents cavitation by allowing large hydraulic liquid leakage when needed, maintaining damping performance under both small and large amplitude vibrations, and enhancing space efficiency and working accuracy of the relief valve.
Implementation Method 1
a circular elastic diaphragm for absorbing internal pressure fluctuation of the primary liquid chamber
Implementation Method 2
a relief valve which is opened and closed to permit and stop leaking the hydraulic liquid through the leak hole from the secondary liquid chamber to the primary liquid chamber
Implementation Method 3
negative pressure is developed instantaneously in a primary liquid chamber when the heavy load is applied, so as to cause the cavitation phenomenon that hydraulic liquid is partially vaporized
Data Source
AI summary
To form a relief valve for preventing the generation of the cavitation phenomenon into a simple and accurately operable structure, there are provided a central thin wall portion and a fixing portion in an elastic diaphragm provided in the partition member to have the fixing portion fixed in position. A relief valve is integrally formed with an outer peripheral portion of the fixing portion. The relief valve is provided with an inclined surface formed on the side of a secondary liquid chamber and a recessed portion opened on the side of a primary liquid chamber and has a difference in rigidity in the circumferential direction. When the primary liquid chamber turns negative pressure, a hydraulic liquid in the secondary liquid chamber opens the relief valve and leaks to the primary liquid chamber so as to prevent the generation of the cavitation phenomenon.