Explosion-Proof Housing Pressure Relief With Breakaway Limit Member
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Solution Overview
Problem
Electrical devices with internal components such as capacitors, switches, and relays are prone to intense pressure buildup and potential explosions during short-circuit faults, which can cause the housing to rupture or spatter.
Innovation Solution
An explosion-proof housing design featuring a first and second housing body connected by a fastener and a limit member with a weakened connection portion, allowing for automatic pressure relief by creating a gap between the housing bodies when pressure increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing structure is made strong and sealed to prevent explosion, then safety and sealing performance are improved, but pressure cannot be relieved promptly causing potential rupture
Solution Approach 1:
The limit member is pre-installed in the fastener before assembly, positioned to limit the protrusion of the limit head. This preliminary configuration ensures that when pressure builds up, the fastener can automatically disengage without requiring additional pressure relief mechanisms, thus resolving the contradiction between strong sealing and pressure relief capability
Solution Approach 2:
The limit member acts as an intermediary element between the fastener and the housing bodies. It mediates the interaction by limiting the limit head's protrusion during normal operation (ensuring sealing) while allowing automatic disengagement when pressure exceeds the limit (relieving pressure), thus resolving the contradiction between maintaining sealing integrity and enabling pressure relief
2Reliability
If the fastener is designed to maintain tight sealing, then sealing performance is improved, but pressure relief capability deteriorates
Solution Approach 1:
The limit member is pre-configured to counteract excessive pressure before it can cause damage. By limiting the limit head's protrusion during normal operation and enabling automatic disengagement when pressure exceeds the threshold, the system prevents harmful pressure buildup while maintaining tight sealing during normal use, thus resolving the contradiction between sealing performance and pressure relief capability
3Strength
If the housing structure is made robust to prevent fracture, then structural strength is improved, but maintenance cost increases when pressure relief is needed
Solution Approach 1:
The pressure relief function is segmented from the main housing structure by using a separate limit member with a weakened connection portion. This allows the limit member to be designed as a sacrificial component that can be easily replaced when it disengages due to pressure, while the main housing bodies remain intact and reusable, thus resolving the contradiction between structural strength and maintenance cost
Solution Approach 2:
The limit member is designed as a disposable component with a weakened connection portion that is intended to fail under excessive pressure. When the limit member disengages, it can be replaced at low cost while the expensive housing bodies are preserved, thus resolving the contradiction between maintaining strong housing structures and minimizing maintenance costs
Data Source
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AI summary
The present disclosure discloses an explosion-proof housing and an electrical device. The explosion-proof housing includes a first housing body, a second housing body, a fastener, and a limit member. The first housing body has a first mounting hole. The second housing body covers the first housing body and has a second mounting hole. The fastener passes through the first mounting hole and the second mounting hole to connect the first housing body to the second housing body. The limit member is disposed between the first mounting hole and the fastener and has a first state and a second state. In the first state, the limit member is adapted to limit a limit head of the fastener outside the first mounting hole. In the second state, at least part of the limit member is disengaged from the limit head to allow the limit head to enter into the first mounting hole. As a result, seal performance of the explosion-proof housing in a use state can be ensured, and automatic pressure relief can be realized. Furthermore, rupture and fracture of a main structure such as the second housing body and the first housing body can be prevented. In this way, later maintenance cost can be reduced while improving use safety.