Sealed Electromagnetic Relay Venting for Gas and Moisture Control
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Solution Overview
Problem
Conventional electromagnetic relays face issues with poor contact conductivity due to infiltration of siloxane gas and water vapor, which can lead to ignition and contact failure, especially in environments where flammable gases are present.
Innovation Solution
The electromagnetic relay incorporates a sealing member to cover the flame extinguishing hole, forming a sealed space, and includes a moisture-absorbing member to absorb water vapor, preventing gas intrusion and extinguishing flames, while maintaining contact integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the accommodating space is open to the outside through an opening, then ease of manufacture and assembly is improved, but contact conductivity deteriorates due to infiltration of siloxane gas and water vapor
Solution Approach 1:
A sealing member (resin film) is used to seal the accommodating space, preventing infiltration of siloxane gas and water vapor while maintaining structural integrity. The sealing member covers the opening of the accommodating space and is fixed to the case, creating a barrier that protects contactors from harmful gases without complicating the manufacturing process.
2Reliability
If the accommodating space is sealed to prevent gas infiltration, then contact conductivity is improved, but flame extinguishing capability deteriorates
Solution Approach 1:
The opening is divided into two functional parts: a flame extinguishing hole for flame suppression and a sealed perimeter for gas barrier protection. The sealing member is configured to cover the opening while leaving the flame extinguishing hole exposed, allowing simultaneous achievement of gas infiltration prevention and flame extinguishing capability.
Solution Approach 2:
Different regions of the opening serve different functions: the flame extinguishing hole region remains open for flame suppression, while the surrounding perimeter is sealed by the sealing member to prevent gas infiltration. This local differentiation of sealing properties allows both flame extinguishing and gas barrier functions to coexist.
3Reliability
If moisture-absorbing material is added to absorb water vapor, then contact conductivity is improved, but device complexity increases
Solution Approach 1:
The moisture-absorbing member is integrated into the accommodating space as an additional component that works synergistically with the sealing member. The moisture-absorbing material is positioned to absorb water vapor that may be generated internally, providing enhanced protection against contact conductivity deterioration without requiring fundamental redesign of the relay structure.
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 prevents siloxane gas intrusion, extinguishes flames, and absorbs water vapor, ensuring reliable contact conductivity even in sub-zero environments with flammable gases.
Implementation Method 1
The coil is arranged in the accommodating space and configured to generate electromagnetic force when energized
Implementation Method 2
The moisture-absorbing member is arranged in the accommodating space to absorb water vapor within the accommodating space
Implementation Method 3
The case or the base has a flame extinguishing hole configured to extinguish a flame
Data Source
AI summary
An electromagnetic relay includes a case having an accommodating space that is open to an outside through an opening, and a base fitted into the case and closing the opening. The case or the base has a flame extinguishing hole for extinguishing a flame. The accommodating space accommodates a coil, a pair of fixed contactors and a movable contactor, and communicates with the outside through the flame extinguishing hole. A sealing member covers the flame extinguishing hole to make the accommodating space a sealed space and suppress intrusion of gas from the outside to an inside of the accommodating space. A moisture-absorbing member is arranged in the accommodating space to absorb water vapor within the accommodating space.