Relief Valve Design for Rapid Cavitation Response in Liquid Sealed Mounts
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Solution Overview
Problem
Existing liquid sealed engine mounts with cylindrical relief valves experience a time lag in preventing cavitation due to the high rigidity of the axial direction, leading to delayed hydraulic liquid leakage and potential noise issues.
Innovation Solution
A liquid sealed vibration isolating device with a relief valve formed thinner than the main body section, featuring pressing projections and elastic deformation restraining portions to facilitate rapid hydraulic leakage from the secondary to the primary liquid chamber during cavitation, and a valve opening restraining portion to prevent excessive deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cylindrical relief valve is used, then the structural strength is improved, but the response speed to cavitation is worsened due to high axial rigidity
Solution Approach 1:
The relief valve is divided into two distinct parts: a thin-walled cylindrical portion for rapid elastic deformation and cavitation response, and a thicker main body section for structural strength and stability. This segmentation allows each part to fulfill its specific function optimally without compromising the other.
Solution Approach 2:
Different parts of the relief valve are given different wall thicknesses to achieve different local properties. The cylindrical portion has thin walls for high flexibility and fast response to pressure changes, while the main body section has thick walls for structural integrity and stability during operation.
2Stability of the object's composition
If the relief valve wall thickness is increased for strength, then the structural stability is improved, but the time lag in preventing cavitation is worsened
Solution Approach 1:
The relief valve is divided into two distinct parts: a thin-walled cylindrical portion for rapid elastic deformation and cavitation response, and a thicker main body section for structural strength and stability. This segmentation allows each part to fulfill its specific function optimally without compromising the other.
Solution Approach 2:
Different parts of the relief valve are given different wall thicknesses to achieve different local properties. The cylindrical portion has thin walls for high flexibility and fast response to pressure changes, while the main body section has thick walls for structural integrity and stability during operation.
3Speed
If the relief valve is made thinner for rapid deformation, then the response speed to cavitation is improved, but the structural strength is worsened
Solution Approach 1:
The relief valve is divided into two distinct parts: a thin-walled cylindrical portion for rapid elastic deformation and cavitation response, and a thicker main body section for structural strength and stability. This segmentation allows each part to fulfill its specific function optimally without compromising the other.
Solution Approach 2:
Different parts of the relief valve are given different wall thicknesses to achieve different local properties. The cylindrical portion has thin walls for high flexibility and fast response to pressure changes, while the main body section has thick walls for structural integrity and stability during operation.
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 ensures rapid hydraulic leakage to prevent cavitation without delay, maintaining the closed condition during positive pressure vibrations and allowing flexible opening during negative pressure conditions, thereby reducing noise and stabilizing the closed state.
Implementation Method 1
the elastic diaphragm is integrally provided with a main body section for absorbing an internal pressure fluctuation of the primary liquid chamber
Implementation Method 2
relief valve for controlling cavitation being provided in a central portion of an elastic diaphragm... when in a cavitation occurring condition the relief valve is brought out of contact with the seal section to open such that a portion around the relief hole of the relief valve is elastically deformed
Data Source
AI summary
A relief valve is provided in a central part of an elastic diaphragm. A relief hole is provided in the central part of the relief valve. The relief valve is formed thinner than a main body section on an outer circumferential side thereof. Pressing projections protrude from the relief valve upper surface at predetermined intervals in the circumferential direction. The pressing projections contact a projection support section, and a central opening of a central section is located above the relief hole. During excessive deformation on a negative pressure side, the hydraulic liquid of a secondary liquid chamber allows an inner peripheral portion of the relief valve to cause such a preceding deformation as to be lifted up, and the relief valve is rapidly brought out of contact with the seal section, so that the hydraulic liquid leaks rapidly from the central opening to a primary liquid chamber.