Firing Pin Side-Wing Structure for Stable Conducting Bar Cutoff
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Solution Overview
Problem
Existing instantaneous circuit breakers face challenges in improving the movement stability and accuracy of the firing pin when cutting off the conducting bar, leading to potential misalignment and rotation during the cutting process.
Innovation Solution
The design incorporates a sliding cylinder with side wings and a specific alignment mechanism for the firing pin, along with an arc extinguishing cavity and energy-absorbing medium, to enhance stability and accuracy in cutting off the conducting bar, while extending the arc path for improved arc extinguishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the firing pin structure is simplified, then the device complexity is reduced, but the movement stability and cutting accuracy deteriorate
Solution Approach 1:
The firing pin is divided into multiple functional segments: a sliding cylinder portion for guided movement, an impact portion for cutting, and side wings for alignment. This segmentation allows each part to perform its specific function optimally while maintaining overall structural simplicity.
Solution Approach 2:
The side wings act as intermediary alignment elements between the firing pin and the conducting bar. They engage with corresponding grooves to ensure precise positioning and prevent rotation during the cutting operation, thereby improving cutting accuracy without complicating the overall structure.
2Ease of operation
If the firing pin moves freely, then the ease of operation is improved, but the movement stability deteriorates
Solution Approach 1:
The sliding cylinder portion of the firing pin has a specific surface quality that interacts with the guide groove in the upper cover. This localized guidance mechanism ensures stable linear movement along the axial direction while allowing the firing pin to operate freely in terms of activation.
Solution Approach 2:
The side wings are pre-positioned to engage with the avoidance grooves on the conducting bar before the impact occurs. This preliminary engagement establishes the correct alignment and prevents rotation during the cutting operation, ensuring movement stability.
3Productivity
If the arc path is shortened, then the productivity is improved, but the arc extinguishing efficiency deteriorates
Solution Approach 1:
The side wings extend the arc path in a radial dimension rather than along the axial cutting direction. As the firing pin moves downward to cut the conducting bar, the arc is forced to travel along the impact surface and diagonal plane of the side wings, effectively lengthening the arc path in a different spatial dimension without slowing down the cutting speed.
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 precise alignment and stability of the firing pin during cutting, reducing misalignment and rotation, and enhances arc extinguishing efficiency by lengthening the arc path and using energy-absorbing media.
Implementation Method 1
ignite the igniter, generating high-pressure gas to push the firing pin to cut off the conducting bar
Implementation Method 2
an energy-absorbing medium arranged at the bottom of the arc extinguishing cavity
Implementation Method 3
an arc extinguishing cavity arranged inside the lower cover and used to extinguish and cut off the arc generated by the conducting bar
Data Source
Figure 1
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AI summary
The present disclosure provides a firing pin and an instantaneous circuit breaker. The firing pin comprises a sliding cylinder whose axial direction aligns with the overall sliding direction of the firing pin, an impact part connected to one end of the sliding cylinder and side wings arranged on both sides of the impact part. The side wings are connected to the sliding cylinder, and the outer contour surface of the side wings is positioned on the extended surface of the outer contour surface of the sliding cylinder. The instantaneous circuit breaker comprises an upper cover, a lower cover, a conducting bar, an igniter and the firing pin. A middle cavity for accommodating the firing pin is arranged in the upper cover, the conducting bar is arranged between the upper cover and the lower cover, and the igniter is embedded and injection-molded on the top of the upper cover.