The air-tight door blocks air convection through physical sealing, mainly using inflation expansion or mechanical compression to achieve tight closure between the door leaf and the door frame.
Sealing Methods
Inflatable Seal: Mainstream solution. When the door is closed, the rubber sealing strip embedded in the groove inflates, filling the gaps and locking the door; it deflates and contracts when opened.
Mechanical Compression: Traditional solution. Uses mechanical structures such as linkages or cams to press high-elasticity sealing rings, deforming them to fit the door frame and achieve a sealing effect.
Operation and Auxiliary Principles
Door Leaf Movement: Some sliding-type air-tight doors perform a downward or inward offset movement (about 7mm) when closing, making the bottom seal tightly contact the floor and the sides fit the door frame.
Environmental Pressure Difference: In medical or laboratory settings, negative pressure is created in the isolated space, using external air pressure to assist in tightly closing the door and enhancing sealing.
Structure and Materials
Materials: Door frames and panels are often made of 304 or 316L stainless steel, with insulation and soundproofing materials filled in the middle.
Control: Equipped with inflation and deflation control systems, pressure sensors, and interlocking devices to ensure stable sealing pressure and operational safety.