HVDC Relay Horizontal Deflection Prevention
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Solution Overview
Problem
In high voltage direct current (HVDC) relays, the lack of position limits in the circumferential direction of the pushrod leads to potential horizontal deflection of the moving reed, resulting in imprecise alignment of moving and stationary contacts and reduced reliability.
Innovation Solution
A horizontal-deflection prevention mechanism is introduced, featuring a moving contact assembly with left and right return springs connected to a positioning plate, which prevents the moving reed from rotating horizontally by providing a constant acting force, ensuring precise contact between moving and stationary contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pushrod is guided only in the axial direction without position limits in the circumferential direction, then the structure is simple and ease of manufacture is improved, but the moving reed may rotate horizontally causing deflection and reducing reliability
Solution Approach 1:
The positioning plate is divided into multiple positioning components (first positioning component and second positioning component) that are symmetrically arranged on opposite sides of the pushrod. Each positioning component independently provides positioning constraints, collectively preventing horizontal rotation while maintaining structural simplicity
Solution Approach 2:
The positioning plate acts as an intermediary component between the pushrod and the moving reed. It provides the necessary positioning constraints to prevent horizontal rotation without directly complicating the pushrod guidance structure, thus maintaining ease of manufacture while improving reliability
2Device complexity
If the moving reed is allowed to move freely in the circumferential direction, then the device complexity is reduced, but the contact precision between moving contacts and stationary contacts deteriorates
Solution Approach 1:
The positioning plate provides localized positioning constraints only in the horizontal direction where needed, while allowing free movement in the axial direction. This localized intervention prevents horizontal deflection without adding complex constraints, maintaining low device complexity while ensuring contact precision
Solution Approach 2:
The positioning components are arranged symmetrically on opposite sides of the pushrod in the horizontal plane. This symmetric arrangement in another dimension (horizontal plane) provides effective positioning constraints without adding complexity to the primary axial movement dimension
3Reliability
If return springs are added to prevent horizontal deflection, then reliability and contact precision are improved, but the device complexity increases
Solution Approach 1:
The positioning plate serves multiple functions: it provides positioning constraints to prevent horizontal rotation, supports the return springs, and maintains the structural framework. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while improving reliability
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 mechanism effectively prevents horizontal deflection of the moving reed, ensuring precise contact alignment and enhancing the reliability of the HVDC relay.
Implementation Method 1
a left return spring is connected between a left end of the moving reed and the positioning plate, and a right return spring is connected between a right end of the moving reed and the positioning plate
Implementation Method 2
a breaking force can be provided, which allows the moving contacts to quickly separate from the stationary contacts when the moving contacts and the stationary contacts are to be separated from each other
Data Source
AI summary
The present invention discloses a horizontal-deflection prevention mechanism for an HVDC relay, comprising a moving contact assembly which comprises a moving reed and moving contacts arranged at left and right ends of the moving reed; an upper section of a pushrod is located above a yoke plate and fixed with the moving reed; a positioning plate is provided on the yoke plate; and a left return spring is connected between a left end of the moving reed and the positioning plate, and a right return spring is connected between a right end of the moving reed and the positioning plate. In the present invention, by the arrangement of a left return spring and a right return spring at the left and right ends of the moving reed at which moving contacts are provided, on one hand, a breaking force can be provided, which allows the moving contacts to quickly separate from the stationary contacts when the moving contacts and the stationary contacts are to be separated from each other, so that the relay makes a response quickly. On the other hand, the left return spring and the right return spring always provide an acting force which prevents the moving reed from rotating horizontally, so as to ensure that the moving contacts and the stationary contacts can come into contact precisely and to thus prevent the occurrence of faults due to the contact between the moving reed and other components.