Analysis of Detailed Drawing for Corners in Class 100 Cleanroom Return Air Rooms: Key Materials and Construction Points

Introduction

In the design and construction of Class 100 cleanrooms, the treatment of the return air system is particularly critical, and the detailed handling of room corners directly affects the overall performance of the cleanroom. This article provides a detailed analysis of the four key materials used in the detailed drawing for corners in Class 100 cleanroom return air rooms: aluminum alloy external corner columns, aluminum alloy internal corner columns, aluminum alloy base channels, and sealant applications.

1. Application of Aluminum Alloy External Corner Columns

Aluminum alloy external corner columns are the core components for handling convex corners in cleanrooms and have the following characteristics:

Material Properties: Made of high-strength aluminum alloy with an anodized surface, offering excellent corrosion and wear resistance.

Structural Design: Precision extruded to ensure accurate dimensions and a perfect fit with wall panels.

Installation Points:

Verify that the corner angle is precisely 90 degrees before installation.

Use specialized fasteners to securely connect to the wall structure.

Leave appropriate expansion gaps at joints with wall panels.

External corner columns not only provide structural support but also effectively prevent dust accumulation in corners, facilitating easy cleaning and maintenance.

2. Treatment of Aluminum Alloy Internal Corner Columns

Aluminum alloy internal corner columns are used for concave corners in cleanrooms:

Airflow Optimization: Specially designed cross-sections help ensure smooth return airflow, reducing turbulence.

Surface Treatment: Typically coated with electrophoretic or powder coatings, with surface resistance meeting anti-static requirements for cleanrooms.

1. Installation Considerations:

Seamless splicing with wall panels.

Internal reinforcement ribs enhance structural stability.

Special treatment at floor junctions to prevent dust accumulation.

3. Critical Role of Aluminum Alloy Base Channels

Aluminum alloy base channels serve as important transition components connecting walls and floors:

Multifunctional Design:

Acts as a fixing base for wall panels.

Provides edge finishing for floor materials.

Conceals return air inlet openings.

Technical Parameters:

Channel depth typically ranges from 50–100 mm.

Slot width is determined based on return air volume calculations.

Adjustable airflow guide plates can be installed internally.

Construction Points:

Ensure levelness using laser alignment before installation.

Properly connect with floor waterproofing layers.

Install easily removable filter frames inside the channel.

4. Selection and Application of Sealant

Sealant plays a vital role in corner treatments for cleanrooms:

Material Selection:

Must use neutral-cure silicone sealant.

Requires anti-mold and antibacterial properties.

Extremely low volatile content (≤0.5%).

Construction Techniques:

Joint cleaning: Use specialized cleaners to remove oil and contaminants.

Backing material: Use closed-cell PE foam rods.

Sealing technique: Apply sealant from the inside out.

Surface finishing: Immediately shape the sealant after application.

Quality Control:

Conduct airtightness tests after curing.

Regularly inspect for cracks or detachment.

Typical service life is 5–8 years, requiring scheduled replacement.

5. Considerations for System Integration

Integrating these four materials requires attention to:

Thermal Expansion: Leave appropriate expansion gaps between different materials.

Electrical Continuity: Ensure all metal components are properly grounded.

Cleanability Verification: Design should facilitate cleaning validation and particle monitoring.

Maintenance Access: Critical connections should be designed for easy disassembly.

Conclusion

The detailed design of corners in Class 100 cleanroom return air rooms is a meticulous task in cleanroom engineering, requiring the perfect integration of materials science, fluid dynamics, and construction techniques. By properly selecting aluminum alloy external corner columns, internal corner columns, base channels, and specialized sealants—and strictly adhering to construction standards—cleanrooms can achieve long-term stable operation and meet the required cleanliness classification. In practical projects, airflow simulation and on-site testing are recommended to verify the rationality of corner designs.

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