Drive Rod Self-Centering for Power Switch Misalignment
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Solution Overview
Problem
Existing circuit breakers face challenges in preventing misalignment of the drive rod, which can lead to malfunctions, and current solutions either require large contact areas or complex structural designs with additional components to guide the drive rod.
Innovation Solution
A self-centering drive rod with radial guiding and centering means attached to the drive rod itself, which aligns axially within the pole shell, minimizing tilting and lateral movements without needing additional components or complex pole shell modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide systems with additional components are used to prevent misalignment, then misalignment prevention is improved, but device complexity increases
Solution Approach 1:
The patent integrates the guide function directly into the drive rod by adding radial guiding elements to the drive rod itself, merging the driving function and guiding function into a single component. This eliminates the need for separate guide systems attached to the pole shell, thereby preventing misalignment while maintaining simple device structure.
2Reliability
If large contact surfaces are used to guarantee functionality despite misalignment, then functionality is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements preliminary alignment action by providing radial guiding elements on the drive rod that prevent misalignment before the contact elements engage. This ensures proper alignment is established in advance, allowing the use of normally sized contact surfaces without requiring oversized contacts to compensate for potential misalignment.
3Reliability
If guide elements are attached to the pole shell, then misalignment prevention is improved, but ease of manufacture deteriorates
Solution Approach 1:
Instead of attaching guide elements to the stationary pole shell as in conventional designs, the patent inverts the approach by attaching the guiding elements directly to the moving drive rod. This inversion simplifies manufacturing and assembly because the guiding elements move with the drive rod, eliminating the need to modify the pole shell structure.
Data Source
Figure 1
Figure 2
Figure 3~7
AI summary
The invention relates to a power switch (1) with a vacuum interrupter (4) held in a pole shell (3) having a fixed contact and a moving contact and having a drive rod (8) which is embodied in an electrically insulating fashion in order to apply a driving movement (13) of a switch drive (9) to the moving contact in order to open and close the contact system of the vacuum interrupter (4). Furthermore, the invention relates to a method for avoiding incorrect orientations of the drive rod (8) of such a power switch (1). In order to make available a particularly simple and, at the same time, economical solution for avoiding incorrect orientations of the drive rod (8), guide means and/or centring means (21) are proposed which are connected to the drive rod (8) and provided radially between the drive rod (8) and the pole shell (3) and are designed to bring about independent axial orientation of the drive rod (8) in the pole shell (3).