Switching Device Holding Mechanism Prevents Premature Contact Movement
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Solution Overview
Problem
Existing operator-independent switching devices, such as circuit breakers, face challenges in maintaining consistent contact connection between moving and fixed contacts, as external factors like operator variability, vibrations, and inertia can cause premature movement of the moving contact before independent spring force activation.
Innovation Solution
A switching device design featuring a housing with a rotary drive mechanism, an output member with radial vanes, an elastic tensioning mechanism, and a holding mechanism that uses frictional or elastic forces to reliably fix and rotate impellers, ensuring consistent contact engagement independent of operator input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual actuation of the drive shaft is used to operate the switching device, then the operator can control the opening or closing of circuits, but the varying force and speed applied by different operators cause inconsistent connection between moving and fixed contacts
Solution Approach 1:
The holding mechanism holds the impeller and moving contact in a predetermined position before the spring mechanism is activated. This preliminary positioning ensures that the moving contact does not move prematurely due to operator variability, vibrations, or inertia, and only moves when the spring mechanism independently activates it, thereby ensuring consistent contact connection.
2Adaptability or versatility
If the impeller is allowed to rotate freely during idle stroke, then the output member can rotate independently, but external factors like vibrations and inertia can cause the moving contact to move too early before spring force activation
Solution Approach 1:
The holding mechanism applies a holding force to counteract external factors such as vibrations, friction, and inertia that could cause the impeller and moving contact to move prematurely. This preliminary counter-action ensures that the moving contact remains stationary until the spring mechanism independently activates it, preventing early movement and ensuring reliable operation.
3Productivity
If the output member directly drives the impeller without clearance, then the connection is more direct, but the operator's manual force can act on the moving contact during the last phase of actuation, causing premature movement
Solution Approach 1:
The holding mechanism holds the impeller in a predetermined position before the output member completes its rotation and before the spring mechanism is activated. This preliminary positioning prevents the operator's manual force from acting on the moving contact during the last phase of actuation, ensuring that the moving contact only moves when independently activated by the spring mechanism.
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 reliable and consistent operation of the moving contact with the fixed contact, reducing premature movement and maintaining a stable connection, enhancing the operator-independent functionality of the circuit breaker.
Implementation Method 1
an elastic tensioning mechanism, which presses against the output surface perpendicular to the axis of rotation of the output element and, in the course of the rotation of the output element, automatically continues to rotate the output element each time the apex is exceeded
Implementation Method 2
A holding mechanism is provided which holds the vane of the impeller wheel with a predetermined holding force in a predetermined angular position range
Implementation Method 3
said support member has first and second elastic ridges sequentially spaced along the path of the second direction in which the vanes of said impellers rotate
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention provides a switch gear (100), which comprises a shell (1), a driving mechanism, a cam (3), at least one elastic bias mechanism (34) and at least one slider (5, 6); the cam (3) is provided with a first joint part (31) and a second joint part (32) which are selectively jointed by the driving mechanism so as to allow the cam (3) to rotate correspondingly along a first direction and a second direction opposite to the first direction; each slider (5, 6) is provided with a body (51) and at least one wing part (52, 53) extending from the radial direction of the body (51); the cam (3) comprises a groove or gap (33), which is used for containing the at least one wing part (52, 53) in an idle stroke manner; the cam (3) can rotate relative to the at least one slider (5, 6), and is connected with the at least one wing part (52, 53) so as to drive the at least one slider to rotate; the switch gear (100) is also provided with a retention mechanism (7).