Arc-Extinguishing Cover Engagement for Contactor Arc Gas Release
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Solution Overview
Problem
Existing electromagnetic contactors face issues with arc-extinguishing covers being blown off due to high internal pressure in the arc-extinguishing chamber, leading to inadequate discharge of arc gas and potential cover detachment.
Innovation Solution
The electromagnetic contactor incorporates engaging portions on both the case and arc-extinguishing cover, allowing for secure mounting and controlled release to prevent the cover from being blown off while effectively discharging arc gas, utilizing a combination of weak and strong engagement mechanisms to manage pressure and prevent detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arc-extinguishing cover is mounted on the upper case with boss shafts and boss holes, then the cover can be securely mounted, but the cover is likely to be blown off when internal pressure increases due to insufficient discharge of arc gas
Solution Approach 1:
The engagement mechanism is divided into multiple engaging portions (first, second, and third engaging portions) distributed at different locations on the arc-extinguishing cover and upper case. This segmentation allows different regions to provide different functions: some regions maintain strong engagement for secure mounting, while others allow controlled release for arc gas discharge, resolving the contradiction between mounting reliability and gas discharge efficiency.
Solution Approach 2:
Different engaging portions are designed with different engagement strengths and characteristics. The first and second engaging portions provide strong engagement for secure mounting, while the third engaging portion is configured to engage with the first and second engaging portions in a way that allows controlled release. This local differentiation of engagement quality enables both secure mounting and effective arc gas discharge.
2Object-generated harmful factors
If the arc-extinguishing cover opens forcefully to discharge arc gas, then gas discharge is improved, but the cover is likely to fall off the upper case
Solution Approach 1:
The engagement mechanism is divided into multiple engaging portions (first, second, and third engaging portions) distributed at different locations on the arc-extinguishing cover and upper case. This segmentation allows different regions to provide different functions: some regions maintain strong engagement for secure mounting, while others allow controlled release for arc gas discharge, resolving the contradiction between mounting reliability and gas discharge efficiency.
Solution Approach 2:
Different engaging portions are designed with different engagement strengths and characteristics. The first and second engaging portions provide strong engagement for secure mounting, while the third engaging portion is configured to engage with the first and second engaging portions in a way that allows controlled release. This local differentiation of engagement quality enables both secure mounting and effective arc gas discharge.
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 configuration ensures reliable prevention of the arc-extinguishing cover from being blown off while efficiently discharging arc gas, maintaining mechanical durability and reducing production costs by minimizing attachment space requirements.
Implementation Method 1
when abnormally large current flows through the contact portions of the electromagnetic contactor due to a short-circuit accident or the like, there is a possibility that increase in internal pressure of the arc-extinguishing chamber because of generated arc gas
Data Source
Figure 1
Figure 2
Figure 3~4B
AI summary
An electromagnetic contactor (1) including: an arc-extinguishing chamber (S) in which a contact portion (6) is disposed; a case (3) having an arc-extinguishing chamber housing portion (9) in which the arc-extinguishing chamber is housed; and an arc-extinguishing cover (7) mounted on the case and configured to cover the arc-extinguishing chamber housing portion, wherein at least one of the case and the arc-extinguishing cover has a first engaging portion (22, 24) and a second engaging portion (23, 25), the other has a third engaging portion (26, 28) configured to engage with the first engaging portion and the second engaging portion, and the arc-extinguishing cover is held to the case in either a first state in which the first engaging portion and the third engaging portion are engaged with each other or a second state in which the second engaging portion is engaged with the third engaging portion.