Electromagnetic Relay Collision Sound Attenuation
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Solution Overview
Problem
Existing electromagnetic relays generate collision sounds when shifting from an operation state to a return state, and current solutions to reduce these sounds increase the number of parts, which is undesirable.
Innovation Solution
An electromagnetic relay design featuring an insulating attenuation member between the movable contactor and the electromagnetic drive unit, along with a sound insulating gap, and a collision sound attenuating unit that lengthens the path of the collision sound propagation, without increasing the number of parts, to reduce the collision sound generated during the separation of the movable contactor from the fixed terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a buffer material is disposed between the magnet holder and the electromagnetic drive unit to reduce collision sound, then the collision sound is reduced, but the number of parts increases
Solution Approach 1:
The patent combines the collision sound reduction function with the existing attenuation member that is already disposed between the movable contactor and the electromagnetic drive unit. By integrating the collision sound attenuating unit into the attenuation member, the invention reduces collision sound without adding separate buffer materials, thus avoiding an increase in the number of parts.
Solution Approach 2:
The attenuation member is designed to serve multiple functions: it acts as both an attenuation member for electrical insulation and a collision sound attenuating unit for noise reduction. The collision sound attenuating unit is configured to lengthen the path through which collision sound propagates, enabling the same component to address both electrical safety and noise reduction requirements.
2Device complexity
If the attenuation member and electromagnetic drive unit are in contact without the sound insulating gap, then the structure is simpler, but the collision sound propagates directly toward the outside of the housing
Solution Approach 1:
The sound insulating gap acts as an intermediary element between the attenuation member and the electromagnetic drive unit. This gap interrupts the direct path for collision sound propagation toward the outside of the housing, forcing the sound to travel through a longer, more attenuated path. The gap is designed to be small enough to maintain structural simplicity while being sufficient to block direct sound transmission.
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
Effectively reduces collision sounds during the separation of the movable contactor from the fixed terminals without increasing the number of parts, thereby maintaining operational reliability and contact integrity.
Implementation Method 1
the attenuation member includes a collision sound attenuating unit configured to lengthen a path through which the collision sound propagates
Data Source
AI summary
An electromagnetic relay includes a housing, a pair of fixed terminals, a movable contactor that is movably disposed so as to approach and separate from a fixed contact placement surface of each of the pair of fixed terminals, a movable shaft capable of moving in conjunction with the movable contactor, electromagnetic drive unit that drives the movable shaft to move the movable contactor in a moving direction, and an attenuation mechanism unit that includes an insulating attenuation member disposed between the movable contactor and the electromagnetic drive unit, and a sound insulating gap provided between the attenuation member and the electromagnetic drive unit.