Vibrationproof Device Dual-Liquid Cavitation Control
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Solution Overview
Problem
Existing vibrationproof devices face issues with cavitation and noise generation due to sudden changes in liquid volume and pressure, leading to decreased vibrationproof performance and increased complexity in configuration.
Innovation Solution
A liquid sealed vibrationproof device with a first liquid and a second liquid, where the second liquid has a higher vapor pressure and lighter specific gravity, is used to preferentially generate cavitation and suppress noise by dispersing the second liquid in the first liquid, reducing shock waves and maintaining vibrationproof performance without increasing device complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid sealed vibrationproof device is used to absorb and damp vibration, then vibrationproof performance is improved, but cavitation occurs in the liquid chamber when internal volume suddenly changes, generating noise and shock waves
Solution Approach 1:
The patent changes the physical parameters of the sealing liquid by introducing a second liquid with higher vapor pressure and lighter specific gravity than the first liquid. This parameter change allows the second liquid to preferentially cavitate under pressure decrease, protecting the first liquid from cavitation and reducing harmful shock waves. The specific parameters modified are vapor pressure and specific gravity of the liquids.
Solution Approach 2:
The second liquid acts as an intermediary substance between the pressure changes and the first liquid. When pressure decreases occur in the main liquid chamber, the second liquid cavitates first, serving as a buffer that prevents direct cavitation of the first liquid. This intermediary mechanism reduces the generation of harmful shock waves and protects the vibrationproof device from noise and damage.
2Object-generated harmful factors
If a liquid pressure valve is added to suppress cavitation, then cavitation occurrence is reduced, but device complexity and size increase
Solution Approach 1:
The patent extracts the cavitation suppression function from the mechanical valve system and transfers it to the chemical/physical properties of the second liquid. Instead of using a complex liquid pressure valve mechanism to control cavitation, the invention utilizes the inherent properties of the second liquid (higher vapor pressure) to automatically suppress cavitation through preferential cavitation and shock wave absorption, thereby eliminating the need for additional valve components.
Solution Approach 2:
The patent changes the physical parameters of the sealing liquid system by adding a second liquid with higher vapor pressure. This parameter change enables the liquid system itself to suppress cavitation naturally through the preferential cavitation of the second liquid, replacing the need for mechanical cavitation suppression devices and simplifying the overall device configuration.
3Reliability
If the internal volume of the main liquid chamber is suddenly increased due to elastic body rebounding, then vibration absorption occurs, but sudden pressure decrease generates cavitation and shock waves
Solution Approach 1:
The patent converts the harmful effect of pressure decrease into a beneficial effect by utilizing the higher vapor pressure of the second liquid. When the elastic body rebounds and causes sudden pressure decrease, the second liquid preferentially cavitates and absorbs the pressure shock, transforming what would be harmful cavitation of the first liquid into a protective mechanism. The shock waves that would normally damage the device are instead absorbed by the second liquid's cavitation and vaporization.
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 suppresses cavitation and noise in vibrationproof devices, maintaining performance and simplicity by using a second liquid with higher vapor pressure and lighter specific gravity, ensuring stable noise reduction even during large vibrations.
Implementation Method 1
the vapor pressure of the second liquid is higher than the vapor pressure of a main component of the first liquid... cavitation is preferentially generated in the second liquid... shock waves are generated when the bubbles disappear
Implementation Method 2
the vapor pressure of the second liquid is higher than the vapor pressure of a main component of the first liquid in the same temperature
Implementation Method 3
a restricting passage which communicates with the main liquid chamber and the auxiliary liquid chamber and in which a liquid column resonance is generated due to the fact that a liquid in the liquid chamber is circulated
Implementation Method 4
an elastic body that elastically connects the first mounting member and the second mounting member to each other
Implementation Method 5
a specific gravity of the second liquid is lighter than a specific gravity of the first liquid... the second liquid... is dispersed in the first liquid independent of one another
Data Source
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AI summary
A vibrationproof device which is a liquid sealed vibrationproof device includes a tubular first mounting member (3) that is connected to either one of a vibration generating portion and a vibration receiving portion, a second mounting member (4) that is connected to other one, an elastic body (5) that elastically connects the first mounting member (3) and the second mounting member (4), and a partition member (8) that partitions a liquid chamber (7) of the inside of the first mounting member (3) into a main liquid chamber (7A) of an upper side having the elastic body as a portion of a wall surface and an auxiliary liquid chamber (7B) of a lower side, and a restricting passage (80) which communicates with the main liquid chamber (7A) and the auxiliary liquid chamber (7B). In addition, a first liquid (L1) is contained as a main liquid and a second liquid (L2) which is insoluble in the first liquid (L1) is contained as an added liquid in the sealed liquid (L), and the vapor pressure of the second liquid (L2) is higher than the vapor pressure of a main component of the first liquid (L1) in the same temperature and a specific gravity of the second liquid (L2) is lighter than a specific gravity of the first liquid (L1).