Cam Disk Spring Excursion Switch Hysteresis Control
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Solution Overview
Problem
The existing hydraulic stored-energy spring mechanisms for high-voltage circuit breakers exhibit recharging hysteresis, which affects the efficiency of fluid flow and pump operation, leading to increased fluid loss before the pump is switched on, and this hysteresis is difficult to control accurately due to tolerances in the cam disk design.
Innovation Solution
A cam disk with a third circumferential region of varying radial extent, positioned between the first and second circumferential regions, allows for adjustable recharging hysteresis by maintaining the switching contact position until the transition to the next region, reducing flank region angles to minimize tolerance and enhance precision in switching points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the flank region of the cam disk is enlarged to provide transition zone, then the switching contact can maintain position longer, but the tolerance accumulation increases and switching precision decreases
Solution Approach 1:
The cam disk is divided into three distinct circumferential regions (first, second, and third regions) with different radial extents. The third circumferential region acts as a dedicated transition zone that separates the first and second regions, allowing the switching contact to maintain its position during transitions while keeping the flank regions minimal. This segmentation resolves the contradiction by providing the necessary transition duration without enlarging the tolerance-prone flank regions.
2Loss of substance
If the pump is switched on earlier to reduce fluid loss, then fluid efficiency improves, but the recharging hysteresis control becomes less accurate
Solution Approach 1:
The cam disk design provides precise mechanical feedback through the switching contact that accurately detects when the stored-energy spring reaches specific extents. The third circumferential region ensures the switching contact maintains a stable position during the critical transition phase, providing reliable feedback signals for pump control. This allows the system to optimize fluid usage by switching the pump at the most efficient moment while maintaining accurate hysteresis control through the precise mechanical positioning.
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 increases recharging hysteresis control, reduces fluid loss, and minimizes the number of pump cycles, improving the efficiency of the hydraulic stored-energy spring mechanism by accurately managing the switching contact transitions.
Implementation Method 1
a stored-energy spring mechanism for a high-voltage circuit breaker with a working piston (46) that is capable of moving in sliding fashion in a working cylinder (22)... the stored-energy spring (40) pressurizes a fluid located in a storage cylinder (21) via a pressure body and pressure piston
Implementation Method 2
If that region of the working cylinder which is remote from the working rod is hydraulically connected to the storage cylinder, the fluid which is under a high pressure can be delivered to this region of the working cylinder and the working piston can be moved into the first end position
Implementation Method 3
The spring excursion switch includes a linearly movable toothed rack, which is coupled to the stored-energy spring and drives a cam disk, via a gearwheel
Data Source
AI summary
The disclosure relates to a cam disc and to a spring deflection switch having a cam disc for a spring-loaded drive, wherein the cam disc includes a first, second and third circumferential region, each having at least one corresponding radial extension, for actuating a pushbutton including a switching hysteresis. The at least one second radial extension is larger than the at least one third radial extension, which in turn is larger than the at least one first radial extension. The pushbutton can interact with the cam disc in the spring deflection switch such that when the pushbutton is applied by the first circumferential region, the switching contact assumes a first switching position, and when the pushbutton is applied by the second circumferential region, the switching contact assumes a second switching position, and when the pushbutton is applied by the third circumferential region, the switching contact remains in the switching position assumed earlier.