DC Relay Anti-Noise Pad for Core Impact Damping
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Solution Overview
Problem
Existing DC relays generate noise due to the impact between the fixed core and movable core during the ON operation, degrading the operational quality.
Innovation Solution
A DC relay design featuring an anti-noise pad with a larger area than the fixed core's upper surface, installed in a recess below an insulating plate, which absorbs the impact and reduces noise by allowing upward movement of the fixed core, thereby alleviating the collision with the movable core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the fixed core and movable core are directly connected without cushioning structure, then the structural simplicity is maintained, but noise is generated due to impact during ON operation
Solution Approach 1:
An anti-noise pad is introduced as an intermediary element between the fixed core and the insulating plate. This pad absorbs the impact force generated during the ON operation when the movable core contacts the fixed core, thereby reducing noise without requiring fundamental changes to the relay structure.
Solution Approach 2:
The anti-noise pad is pre-installed between the fixed core and the insulating plate to provide cushioning before the impact occurs. This beforehand cushioning structure is designed to absorb the impact force during the ON operation, preventing noise generation while maintaining structural simplicity.
2Object-affected harmful factors
If the fixed core is rigidly fixed to the insulating plate, then the structural stability is improved, but impact force during ON operation increases causing noise
Solution Approach 1:
The anti-noise pad serves as a mediator between the rigid fixed core and the insulating plate. It allows the fixed core to remain structurally stable while absorbing the impact force during operation, thus reducing noise without compromising structural integrity.
Solution Approach 2:
The anti-noise pad changes the mechanical parameter of the connection between the fixed core and insulating plate from rigid to compliant. This parameter change allows the structure to absorb impact forces while maintaining overall 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 design effectively reduces noise generation during the ON operation by absorbing the impact, enhancing the operational quality of the DC relay.
Implementation Method 1
an anti-noise pad provided between the fixed core (40) and the insulating plate (25)
Implementation Method 2
a coil (5) generating a magnetic field when external power is input, a fixed core (6) fixed to and installed within the coil (5)
Implementation Method 3
The movable core (7), compressing the return spring (9), is lifted by a magnetic attractive force of the fixed core (6)
Data Source
Figure 1
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AI summary
A DC relay includes a pair of fixed contacts fixedly installed on one side of a frame, a movable contact movably installed below the pair of fixed contacts and brought into contact with the pair of fixed contacts or separated therefrom, an insulating plate installed below the movable contact (12), a contact spring provided between the movable contact and the insulating plate, a plate installed below the insulating plate (25) and having a through hole formed in a central portion thereof, a fixed core (40) inserted from above the plate (20) through the through hole (21) and having a shaft hole formed at the center thereof, an anti-noise pad provided between the fixed core and the insulating plate, a movable core installed to be linearly movable below the fixed core, and a shaft installed to penetrate through the through hole.