High-Voltage DC Relay Auxiliary Contact Insulation Against Arc Contamination
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Solution Overview
Problem
High-voltage DC relays with auxiliary contacts suffer from contamination and damage due to electric arcs generated when movable and fixed contacts separate, affecting insulation and assembly integrity.
Innovation Solution
The design incorporates a plastic body with U-shaped walls to enclose and insulate the auxiliary movable contact piece, preventing contamination and deformation, and rearranges the auxiliary contact leading-out terminal to lead out from the bottom for consistent directionality and secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the auxiliary contact leading-out terminals are fixed at the top wall of the ceramic cover and extend into the cavity, then the relay can provide auxiliary contact function, but the electric arc generated when main contacts disconnect will contaminate and damage the auxiliary contact structure
Solution Approach 1:
The auxiliary contact leading-out terminals are extracted from the top wall position and relocated to the bottom wall of the ceramic cover. This extraction removes the auxiliary contacts from the harmful electric arc zone generated at the top during main contact disconnection, preventing contamination and damage while preserving the auxiliary contact function.
Solution Approach 2:
The auxiliary contact leading-out terminals are repositioned from a horizontal arrangement at the top wall to a vertical arrangement at the bottom wall. This dimensional change in terminal positioning moves the auxiliary contacts to a different spatial zone that is not affected by the electric arc generated during main contact operation.
2Device complexity
If the auxiliary contact leading-out terminals are arranged symmetrically in the middle of two fixed contacts, then the relay structure is compact, but the auxiliary contact structure is exposed to electric arc and metal particle contamination
Solution Approach 1:
The auxiliary contact leading-out terminals are extracted from the vulnerable position in the middle of the fixed contacts at the top wall and relocated to the bottom wall. This extraction removes them from the harmful electric arc zone while maintaining a compact overall structure through optimized spatial arrangement.
Solution Approach 2:
The ceramic cover itself acts as an intermediary protective structure. The bottom wall of the ceramic cover serves as a protective barrier that positions the auxiliary contact leading-out terminals outside the electric arc zone, using the cover's structural properties to shield the auxiliary contacts from contamination.
3Ease of manufacture
If the auxiliary movable contact piece is exposed during assembly turnover, then assembly is simple, but the auxiliary movable contact piece may be contaminated or deformed by touching
Solution Approach 1:
The auxiliary movable contact piece is nested within the ceramic cover's internal cavity structure. This nesting arrangement provides inherent protection during assembly turnover, as the ceramic cover encloses and shields the delicate auxiliary movable contact piece from external contamination and deformation while allowing for straightforward assembly processes.
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
Prevents contamination and deformation of auxiliary contacts, ensures reliable insulation, and facilitates secure assembly by aligning the auxiliary contact leading-out terminal with the main contact, enhancing the relay's functionality and durability.
Implementation Method 1
the plastic body includes a middle plastic body in which a middle part of the auxiliary movable contact piece is wrapped and two U-shaped plastic bodies connected to both sides of the middle plastic body... two U-shaped side walls of each of the two U-shaped plastic bodies are respectively disposed on both sides of a width of both ends of the auxiliary movable contact piece to form the blocking wall
Implementation Method 2
the bottom plastic body is connected to bottom surfaces of the middle plastic body and the U-shaped plastic body, so that the auxiliary movable contact piece is insulated from the main movable contact piece arranged therebelow
Implementation Method 3
When a main contact is disconnected, an electric arc is generated, so that metal particles with larger heat are irregularly scattered in the ceramic inner cavity after the electric arc is broken
Data Source
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AI summary
The present disclosure discloses a high-voltage DC relay with an auxiliary contact. The high-voltage DC relay includes a cover (1), a main contact leading-out terminal (2), a pushing rod assembly (3), a main movable contact piece (4), an auxiliary contact leading-out terminal (5) and an auxiliary movable contact piece (6). The main contact leading-out terminal (2) and the auxiliary contact leading-out terminal (5) are respectively fixed on a top wall (11) of the cover (1) and their bottom ends respectively extend into a cavity of the cover (1). The main movable contact piece (4) and the auxiliary movable contact piece (6) are respectively matched with corresponding bottom ends of the main contact leading-out terminal (2) and the auxiliary contact leading-out terminal (5). Two auxiliary contact leading-out terminals (5) are arranged on both sides of a connecting line between two main contact leading-out terminals (2), and the auxiliary movable contact piece (6) is also connected with a plastic body (7). A plastic blocking wall (71) is respectively arranged between each of two sides of the plastic body (7) corresponding to both ends of the auxiliary movable contact piece (6) and the main contact leading-out terminal (2). The present disclosure can prevent an electric arc generated when a movable contact is separated from a fixed contact from contaminating the auxiliary contact structure, and can realize the insulation between strong voltage and weak voltage. Also, the present disclosure can prevent the auxiliary movable contact piece (6) from being contaminated or deformed by touching the auxiliary movable contact piece (6) during an assembly turnover process.