Hydraulic Pressure Spring Threaded Closure Design
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Solution Overview
Problem
Hydraulic pressure springs face challenges in maintaining high internal pressure and preventing fluid leakage due to the use of check valves, which can lead to performance decline and leakage of compressible liquids during impact absorption.
Innovation Solution
A hydraulic pressure spring design that utilizes a hollow cylindrical cylinder with threaded ends and closure means to pressurize a compressible liquid to a predetermined level, eliminating the need for check valves and enhancing sealability by using threaded insertion to maintain pressure and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a check valve is used to maintain high internal pressure, then the initial pressure of the compressible liquid can be set high, but the risk of fluid leakage increases during impact absorption
Solution Approach 1:
The patent removes the check valve from the system entirely. Instead of using a valve to maintain pressure, the invention uses the pre-compressed elastic fluid itself and the elastic recovery force of the deformed cylinder to maintain internal pressure and prevent leakage during impact absorption.
Solution Approach 2:
The cylinder is pre-deformed during manufacturing to store elastic energy and create a pre-compression effect on the compressible liquid. This beforehand cushioning allows the system to resist impact forces without requiring additional components like check valves, thereby maintaining both high pressure and reliability.
2Force
If the internal pressure of the compressible liquid is set high, then a high reaction force is obtained during impact absorption, but the sealability requirements become more stringent and leakage risk increases
Solution Approach 1:
The patent converts the potential harm of high pressure causing leakage into a benefit by using the pre-deformed cylinder's elastic recovery force. This elastic force actively counteracts the high internal pressure, preventing leakage while maintaining the high reaction force needed for impact absorption.
3Reliability
If a check valve is used to prevent fluid efflux, then the device structure becomes more complex, but the check valve itself becomes a potential leakage point
Solution Approach 1:
The check valve is completely extracted from the system. The patent achieves fluid efflux prevention through the elastic recovery force of the deformed cylinder, which naturally opposes any fluid movement during impact, eliminating the need for additional valve components and reducing structural complexity.
Solution Approach 2:
The deformed cylinder structure serves multiple functions: it stores elastic energy, maintains internal pressure, and prevents fluid leakage through its elastic recovery force. This self-service mechanism eliminates the need for separate check valves and other additional components.
4Reliability
If the internal pressure is set low relative to external pressure, then sealability is easier to maintain, but the initial resisting force during impact absorption becomes small
Solution Approach 1:
The cylinder is pre-deformed during manufacturing to store elastic energy that creates an initial compression effect on the compressible liquid. This beforehand cushioning provides both the necessary initial resisting force and maintains sealability, as the elastic recovery force increases with compression rather than requiring high static pressure.
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
This design effectively maintains the desired pressure of the compressible liquid over time, preventing leakage both at normal conditions and during impacts, thereby improving the performance and longevity of the hydraulic pressure spring.
Implementation Method 1
when a piston rod forcibly enters the interior of the cylinder owing to a shock, the volume for accommodating an elastic fluid in the cylinder becomes small as compared with the initial period, so that the elastic fluid sealed in the cylinder is compressed and its pressure increases
Implementation Method 2
This increased pressure serves as a reaction force, and the spring action (restoring action) is generated to push back the impact object and absorb the energy in the process in which the elastic fluid is compressed
Data Source
AI summary
A hydraulic pressure spring includes a hollow cylindrical cylinder having a threaded portion at one end thereof; a closure means which is threadedly engaged with the threaded portion at the one end of the cylinder and closes the one end of the cylinder; a closure means which is provided at the other end of the cylinder and closes the other end of the cylinder; a compressible liquid which is sealed in an interior of the cylinder and is pressurized to a predetermined pressure; a rod which is passed through the closure means movably in an axial direction A and causes the liquid in the interior of the cylinder to undergo a pressure rise as the rod enters the interior of the cylinder; and a piston disposed in the interior of the cylinder and attached to one end of the rod.