Nested Spring Hydraulic Switchgear Drive
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Solution Overview
Problem
Existing switchgear driving devices, particularly hydraulic operation devices, face issues with size increase due to separate positioning of turning-off and turning-on pressure accumulation springs, and spring-type devices have complex mechanisms requiring maintenance.
Innovation Solution
A switchgear driving device utilizing a hydraulic oil system with a fluid pressure mechanism including turning-on and turning-off pressure accumulation chambers, controlled by a main control valve, and employing turning-on and turning-off pressure accumulation springs where the turning-off spring is arranged inside the turning-on spring, reducing size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the turning-off pressure accumulation spring and turning-on pressure accumulation spring are installed at different positions, then the mechanism complexity is reduced, but the device size increases
Solution Approach 1:
The turning-off pressure accumulation spring is installed inside the turning-on pressure accumulation spring, creating a nested configuration. This allows both springs to occupy the same spatial envelope, reducing the overall device size while maintaining the simplicity of having springs at different functional positions.
2Device complexity
If compressed gas is used in the pressure accumulator, then the device structure is simplified, but the hydraulic oil pressure fluctuates due to ambient temperature changes
Solution Approach 1:
The patent uses hydraulic oil instead of compressed gas in the pressure accumulator. Hydraulic oil is incompressible and does not expand or contract with temperature changes, thereby eliminating pressure fluctuations caused by ambient temperature variations while maintaining a simplified device structure.
Solution Approach 2:
The patent changes the physical state parameter of the pressure accumulation medium from gas (compressible, temperature-sensitive) to hydraulic oil (incompressible, temperature-stable). This parameter change resolves the contradiction between structural simplicity and pressure stability.
3Reliability
If spring-type operation device is used, then the device is not influenced by ambient temperature, but the mechanism becomes complicated requiring maintenance
Solution Approach 1:
The patent employs a hydraulic operation device that uses hydraulic oil pressure to act on a piston for opening/closing operations. This hydraulic system achieves ambient temperature independence through the use of incompressible hydraulic oil, while avoiding the complicated spring mechanisms by using a straightforward pressure transmission system.
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 provides a compact, high-reliability switchgear driving device unaffected by ambient temperature fluctuations, with a reduced number of components and simplified maintenance needs.
Implementation Method 1
a turning-on pressure accumulation spring which imparts a driving force to the turning-on pressure accumulation piston to pressurize the hydraulic oil within the turning-on pressure accumulation chamber
Implementation Method 2
a turning-off pressure accumulation spring which imparts a driving force to the turning-off pressure accumulation piston to pressurize the hydraulic oil in the turning-off pressure accumulation chamber
Implementation Method 3
a hydraulic operation device which is equipped with a pressure accumulator using a compressed gas such as N2 gas and which causes a pressure oil due to this pressure accumulator to act on a piston to perform the opening/closing operation
Data Source
AI summary
A switchgear driving device has a rod coupled to a movable electrode; an operation piston connected to the rod; and an operation cylinder in which an operation piston slides. A main control valve controls the pressure of the hydraulic oil in the operation cylinder. A turning-on pressure accumulation piston slides inside a turning-on pressure accumulation chamber; and a turning-on pressure accumulation spring imparts a driving force to the turning-on pressure accumulation piston to pressurize the hydraulic oil within the turning-on pressure accumulation chamber. A turning-off pressure accumulation piston slides inside a turning-off pressure accumulation chamber. A turning-off pressure accumulation spring imparts a driving force to the turning-off pressure accumulation piston to pressurize the hydraulic oil in the turning-off pressure accumulation chamber. A spring case accommodates the turning-on pressure accumulation spring and the turning-off pressure accumulation spring, wherein the turning-off pressure accumulation spring is arranged inside the turning-on pressure accumulation spring.