Spherical Bearing Contact Alignment for HV Switches
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Solution Overview
Problem
Medium and high voltage switches face challenges with precise alignment requirements and increased maintenance needs due to misalignment issues, leading to wear and obstruction in sliding movements, which can result in reduced reliability and increased manufacturing costs.
Innovation Solution
The implementation of a spherical-bearing-type mechanical connection between moveable and stationary contact elements, allowing for angular flexion and tolerating misalignment, thereby simplifying manufacturing, reducing alignment requirements, and ensuring reliable operation across a wide range of conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sliding contact elements are used, then mechanical connection is established, but alignment precision requirements increase and maintenance needs increase
Solution Approach 1:
The patent applies spherical bearing elements at the contact interfaces between moveable and stationary contact elements. The spherical geometry allows angular flexion and automatically accommodates misalignment through point contact, eliminating the need for precise sliding surface alignment while maintaining reliable mechanical and electrical connection.
2Duration of action of moving object
If conventional sliding contact elements are used, then mechanical connection is established, but wear and obstruction occur reducing operational duration
Solution Approach 1:
The spherical bearing contact elements create point contact instead of surface sliding, dramatically reducing friction and wear. The spherical geometry allows smooth angular adjustment and eliminates sticking and obstruction, enabling reliable operation over extended periods without maintenance.
3Ease of operation
If precise alignment is required for contact elements, then low-friction movement is achieved, but installation complexity and maintenance requirements increase
Solution Approach 1:
The spherical bearing elements provide self-aligning point contact that naturally accommodates positional variations and thermal expansion. This eliminates the need for precise alignment during installation and removes the requirement for regular maintenance to ensure alignment, while maintaining low-friction operation throughout the device lifecycle.
Data Source
Figure 1a~2b
Figure 3a~4c
Figure 5a~5f
AI summary
A medium or high voltage switch comprising a moveable contact element (10) and a stationary contact element (20, 30) is described. Therein, a moveable-contact guiding portion (14, 14') of the moveable contact element (10) and a stationary-contact guiding portion (24, 34) of the stationary contact element (20, 30) are shaped for establishing a spherical-bearing-type mechanical connection between each other, thereby aligning a center of the moveable-contact guiding portion (14, 14') with a center of the stationary-contact guiding portion (24, 34) while allowing an angular flexion between the moveable and stationary contact elements (10, 20, 30). Furthermore, at least one of the stationary-contact guiding portion (24, 34) and the moveable-contact guiding portion (14, 14') is electrically insulating.