Contact Device Impact Absorber Noise Reduction
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Solution Overview
Problem
Conventional contact devices for high-load relays generate operating noise due to vibrations when the movable core moves, which is undesirable and affects the acoustic environment.
Innovation Solution
Incorporating an impact absorber on the movable armature side of the movable core receiver and a movement restriction member to absorb the impact and restrict movement, respectively, while maintaining the magnetic attraction force by positioning these components on the armature side, thus reducing vibration and noise without compromising magnetic force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an impact absorber is disposed on the movable core receiver to absorb impact, then operating noise is reduced, but a magnetic gap is generated between the movable core and movable core receiver reducing attraction force
Solution Approach 1:
The impact absorber is positioned on the movable armature side of the movable core receiver rather than between the movable core and movable core receiver. This spatial repositioning in a different dimension allows the impact absorber to absorb impact vibrations without interfering with the magnetic gap between the movable core and movable core receiver, thus maintaining magnetic attraction force while reducing operating noise
Solution Approach 2:
The movement restriction member acts as an intermediary component that restricts the movement of the impact absorber. By controlling the impact absorber's movement, this intermediary element ensures that the impact absorber can absorb impact effectively without displacing into the magnetic gap and affecting the magnetic attraction force between the movable core and movable core receiver
2Stability of the object's composition
If the impact absorber is restricted from moving, then noise reduction stability is improved, but the impact absorption effectiveness may be reduced
Solution Approach 1:
The movement restriction member is designed with specific structural parameters (opening size, position, and configuration) that allow the impact absorber to move within controlled limits. This parameter optimization enables the impact absorber to absorb impact effectively while preventing excessive movement that would compromise noise reduction stability
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 solution effectively suppresses vibrations and reduces operating noise by absorbing the impact generated during core movement, ensuring stable noise reduction without affecting the magnetic attraction force.
Implementation Method 1
an impact absorber disposed on a surface on the movable armature side of the movable core receiver to absorb an impact generated when the movable core hit the movable core receiver
Implementation Method 2
an electromagnetic mechanism for driving the movable core in response to an excitation current so as to bring the movable contact into contact with the fixed contact
Data Source
AI summary
A contact device including a pair of fixed terminals 2 with a fixed contact 2a each, a movable armature 3 with movable contacts 3a which contact to or separate from the fixed contacts 2a, a movable shaft 4 connected to the movable armature 3 at its one end, a movable core 8 secured to the opposite end 4b side of the movable shaft 4, a movable core receiver 7 slid onto the movable shaft 4 so that it faces a surface 8b on the movable armature side of the movable core 3 to receive the movable core 8 driven by an electromagnetic mechanism, an impact absorber 17 disposed on a surface 7a on the movable armature side of the movable core receiver 7 to absorb an impact generated when the movable core 3 hit the movable core receiver 7, and a stopper 16 (a movement restriction member) disposed on a surface on the movable armature side of the impact absorber 17 to restrict a movement of the impact absorber 17.