Electromagnetic Relay Partition Layout for Auxiliary Contact Reliability
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Solution Overview
Problem
In electromagnetic relays with high current flowing through the main contact portion, there is a risk of the auxiliary contact portion being affected by consumable powder, leading to a decrease in contact reliability.
Innovation Solution
The electromagnetic relay is designed with a partition wall that divides the internal space into two sections, separating the main and auxiliary contact portions, and includes a specific arrangement of components to minimize the impact of consumable powder on the auxiliary contact portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the current flowing through the main contact portion is increased, then the power handling capability is improved, but the auxiliary contact portion is affected by consumable powder leading to deteriorated contact reliability
Solution Approach 1:
The internal space of the housing is divided into a first space and a second space by a partition wall. The main contact portion is disposed in the first space while the auxiliary contact portion is disposed in the second space. This spatial segmentation prevents consumable powder generated in the main contact portion from affecting the auxiliary contact portion, thereby maintaining contact reliability even when high current flows through the main contact portion.
2Device complexity
If the main and auxiliary contact portions are disposed in the same internal space, then the device structure is simplified, but the auxiliary contact portion is exposed to consumable powder from the main contact portion
Solution Approach 1:
A partition wall divides the internal space into two separate spaces: a first space for the main contact portion and a second space for the auxiliary contact portion. This segmentation isolates the auxiliary contact portion from consumable powder generated in the main contact portion, reducing harmful exposure while maintaining a relatively compact overall structure.
Solution Approach 2:
The partition wall is selectively positioned to create localized separation between the main and auxiliary contact portions. This local quality change ensures that only the necessary areas are separated to prevent powder contamination, rather than completely isolating the entire device into separate compartments.
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
This design effectively suppresses the decrease in contact reliability of the auxiliary contact portion even when high current flows through the main contact portion, enhancing overall reliability.
Implementation Method 1
a coil provided in the housing such that a central axis extends in a vertical direction; an iron core disposed so as to be surrounded by the coil; a yoke disposed around the coil; an armature that is disposed to face an upper end of the iron core and swings in response to excitation/non-excitation of the coil
Data Source
AI summary
An electromagnetic relay includes: a housing including a base and a case that opens downward and is provided on the base, the housing having an internal space surrounded by the base and the case; a main fixed contact; a main moving contact that comes into contact with and separates from the main fixed contact; an auxiliary fixed contact; an auxiliary moving contact that comes into contact with and separates from the auxiliary fixed contact; a coil provided in the housing such that a central axis extends in a vertical direction; an iron core disposed so as to be surrounded by the coil; a yoke disposed around the coil; an armature that is disposed to face an upper end of the iron core and swings in response to excitation/non-excitation of the coil; a movable part provided with the main moving contact and configured to move in response to swinging of the armature; and a partition wall that divides the internal space of the housing into a first space and a second space. The main fixed contact and the main moving contact are disposed in the first space, and the auxiliary fixed contact and the auxiliary moving contact are disposed in the second space.