Electromagnetic Relay Spool Wall for Terminal Insulation
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Solution Overview
Problem
Electromagnetic relays face a challenge in maintaining insulation between fixed terminals due to the accumulation of wear particles, which can lead to a decrease in insulation effectiveness. This issue is compounded by the need to prevent the relay from increasing in size.
Innovation Solution
The electromagnetic relay incorporates a spool with a support portion and a lateral wall portion. The lateral wall portion extends between the first fixed terminal and the side surface of the housing, increasing the creepage distance between the fixed terminals. This design enhances insulation without enlarging the relay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the fixed terminals and the side surface of the housing is increased to improve insulation, then the insulation between fixed terminals is improved, but the electromagnetic relay becomes large in size
Solution Approach 1:
The invention introduces a lateral wall portion that extends in the left-right direction (lateral dimension) between the first fixed terminal and the side surface of the housing. This adds a new spatial dimension to the insulation path, increasing the creepage distance without requiring increased distance in the front-rear direction, thereby maintaining compact relay size while improving insulation reliability
Solution Approach 2:
The lateral wall portion acts as an intermediary structure that physically separates the first fixed terminal from the side surface of the housing. This intermediate element increases the creepage path for wear particles and provides additional insulation, resolving the contradiction between maintaining small size and ensuring reliable insulation
2Reliability
If wear particles accumulate along the side surface of the housing beside the fixed terminals, then the insulation between the fixed terminals is reduced, but increasing the distance between the fixed terminals and the side surface increases the size of the relay
Solution Approach 1:
The lateral wall portion is pre-configured to extend between the first fixed terminal and the housing side surface, establishing a protective barrier before wear particles can accumulate. This preliminary structural arrangement prevents particles from directly bridging the insulation path, maintaining reliable insulation without requiring larger dimensions
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 increased creepage distance effectively prevents a decrease in insulation between the fixed terminals caused by wear particles, while also preventing the electromagnetic relay from becoming too large.
Implementation Method 1
a coil (21) wound around the spool (22)
Data Source
AI summary
An electromagnetic relay includes a first fixed terminal, a second fixed terminal, a housing, a coil, and a spool. The second fixed terminal is disposed in front of the first fixed terminal and faces the first fixed terminal. The housing includes a side surface that laterally covers the first fixed terminal and the second fixed terminal. The coil is wound around the spool. The spool includes a support portion and a lateral wall portion. The support portion supports the first fixed terminal. The lateral wall portion extends from the support portion and is disposed between the first fixed terminal and the side surface of the housing in the left-right direction. The front end of the lateral wall portion is located between the first fixed terminal and the second fixed terminal in the front-rear direction.