Welded Pressure Relief Body Flameproof Integrity
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Solution Overview
Problem
The challenge lies in ensuring reliable flameproof fastening of pressure relief bodies in explosion-proof housings, particularly in maintaining protection against flame spread and preventing malfunctions over prolonged use.
Innovation Solution
A pressure relief body is welded to a housing part using a fusion layer created by locally applying heat, such as with a laser beam, to close pores and securely attach wire mesh layers, ensuring a rigid and corrosion-resistant connection, which can be applied to various materials like stainless steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pressure relief body is clamped between flanges or sealed with plastic material, then the assembly is simple and suitable for series production, but flameproof integrity may be compromised over prolonged use
Solution Approach 1:
The patent replaces mechanical fastening systems (clamps, flanges) and chemical sealing (plastic material) with a welding process that creates a metallurgical bond. The weld seam fuses the pressure relief body directly to the housing, eliminating the need for separate fastening components and providing inherent flameproof integrity through the continuous metal bond.
Solution Approach 2:
The patent combines the fastening function and the flameproof sealing function into a single welding operation. The weld seam simultaneously attaches the pressure relief body to the housing and creates a flame-tight barrier, merging two separate functions that were previously achieved by separate components (fasteners and seals).
2Reliability
If a pressure relief body is welded to the housing, then flameproof integrity is ensured, but the manufacturing process becomes more complex
Solution Approach 1:
The patent extracts the flameproof sealing function from separate sealing components and integrates it directly into the welding process itself. The weld seam becomes both the mechanical attachment and the flameproof barrier, eliminating the need for separate sealing elements and reducing overall device complexity despite the advanced manufacturing process.
3Strength
If the porous body is sintered to a solid extension piece, then a rigid connection is achieved, but the connection may not provide adequate flameproof sealing
Solution Approach 1:
The patent changes the fundamental parameter of the connection method from sintering (which creates a rigid but potentially porous bond) to welding (which creates a rigid and completely fused bond). The welding process melts and fuses the materials together, eliminating the pore structure that remains in sintered connections and providing both rigidity and flameproof sealing.
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 method provides a robust and reliable attachment that maintains flameproof integrity, effectively preventing flame spread and ensuring reliable operation even after extended use, while allowing for efficient gas pressure equalization and cooling.
Implementation Method 1
A pressure relief body is welded to a housing part using a fusion layer created by locally applying heat, such as with a laser beam, to close pores and securely attach wire mesh layers
Implementation Method 2
A pressure relief body is welded to a housing part using a fusion layer created by locally applying heat
Data Source
Figure 1~2
Figure 3~7
Figure 8~9
AI summary
The invention relates to a pressure relief body sintered from a wire mesh and retained on an explosion-proof housing by welding. The corresponding welded seam (19) and/or (21) has a fusion zone both on the pressure relief body (13) and on the housing part (18) and makes a mechanically robust and gas-tight joint between the two.