Swirl Chamber Flow Path for Cavitation-Quiet Vibration Dampers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vibration-damping devices experience increased manufacturing costs and reduced design freedom due to complex structures and deteriorating vibration-damping characteristics when attempting to suppress abnormal noise from cavitation collapse, particularly under large vibration inputs.
Innovation Solution
A vibration-damping device with a cylindrical mounting member, an elastic body, and a partition member that includes a restricted passage with a swirl chamber to generate swirling flows, reducing pressure loss and bubble formation through a main body flow path with multiple communication ports and pores, which are strategically positioned to manage flow velocity and prevent cavitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a valve body is provided in the restricted passage to suppress negative pressure and cavitation, then abnormal noise from cavitation collapse is reduced, but the structure becomes complicated and manufacturing costs increase
Solution Approach 1:
The invention extracts the valve body from the restricted passage, eliminating the complex component while maintaining cavitation suppression. Instead of using a valve body to control flow, the design relies on the natural flow dynamics through the restricted passage and the elastic body's rebound characteristics to prevent negative pressure buildup that causes cavitation.
Solution Approach 2:
The invention introduces an intermediary mechanism where the elastic body's deformation and rebound act as a mediator to regulate pressure changes in the liquid chamber. The elastic body absorbs and releases energy gradually, preventing rapid negative pressure changes that would cause cavitation, thereby eliminating the need for a valve body.
2Object-affected harmful factors
If a valve body is provided in the restricted passage to suppress negative pressure and cavitation, then abnormal noise from cavitation collapse is reduced, but manufacturing costs increase due to tuning requirements
Solution Approach 1:
By removing the valve body entirely, the invention eliminates the need for complex tuning procedures and associated manufacturing costs. The restricted passage geometry and elastic body properties are designed to naturally prevent cavitation without requiring adjustable components.
Solution Approach 2:
The system becomes self-regulating through the inherent characteristics of the elastic body and restricted passage design. The elastic body's natural rebound behavior and the passage's flow characteristics work together to prevent negative pressure buildup, eliminating the need for externally tuned valve mechanisms.
3Object-affected harmful factors
If a valve body is provided in the restricted passage to suppress negative pressure and cavitation, then abnormal noise from cavitation collapse is reduced, but the degree of freedom in design is reduced and vibration-damping characteristics may deteriorate
Solution Approach 1:
Removing the valve body restores design freedom by eliminating a constraining component. The invention achieves cavitation suppression through the elastic body's deformation characteristics and the restricted passage's geometry, allowing for more flexible design optimizations for vibration damping.
Solution Approach 2:
The invention employs dynamic behavior of the elastic body to regulate pressure changes. The elastic body's time-varying deformation during vibration cycles naturally manages pressure fluctuations, providing adaptability and design freedom that rigid valve structures cannot offer.
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 abnormal noise from cavitation collapse while maintaining vibration-damping characteristics, achieving this with a simpler structure by managing flow velocity and bubble dispersion through the swirl chamber and pore configuration.
Implementation Method 1
an elastic body elastically connecting the first and second mounting members
Implementation Method 2
absorbs and attenuates vibrations of a vibration-generating unit such as an engine
Implementation Method 3
a liquid pressure of the main liquid chamber changes to cause the liquid to flow in the restricted passage
Implementation Method 4
the liquid to flow in the restricted passage, and thereby the vibration is absorbed and attenuated
Implementation Method 5
the main body flow path includes a swirl chamber that generates a swirling flow of the liquid according to a flow velocity of the liquid
Implementation Method 6
generation of abnormal noise due to cavitation collapse can be suppressed
Data Source
AI summary
A restricted passage (24) of the present invention includes a first communication part (26) which is open to a first liquid chamber, a second communication part (27) which is open to a second liquid chamber, and a main body flow path (25) which allows the first communication part (26) and the second communication part (27) to communicate with each other, the main body flow path (25) includes a swirl chamber (34) that generates a swirling flow of the liquid according to a flow velocity of the liquid from the other of the first communication part (26) and the second communication part (27), and the swirl chamber (34) is disposed to be spaced apart from one of the first ID communication part (26) and the second communication part (27).