How to handle the movable gap between the opening fan and the frame material is the key to the sealing design of the door shaft of the clean room. The crevice of the overlap is different from the fixed gap, as the movable fan needs to be opened and the "once and for all" sealing measures can not be taken.
Compared with the axis, the opening fan of the clean room door is larger, and the movable gap occupies a larger proportion in the total number of structural gaps in a pinch of the clean room door. The opening time of the clean room door is much more frequent than that of the ancient times, and the working conditions of the surrounding gap of the clean room door fan are more complex. Taking a single flat clean room door as an example, the two sides of the vertical are small, and the side of the handle is often rubbed or collided when passing. The direction of force applied to the bore on one side of the hinge is completely different from that on the other three sides due to the rotation of the fan.
The threshold of clean room should be specially constructed according to different requirements of transportation and pedestrian. Three of the four sides of a pinch of a single flat door need to be treated differently, and the middle of the two clean room doors also has a special structure. Therefore, in the design of the clean room door, the sealing treatment of the movable gap is a more prominent problem. The size and form of grooves which overlap the opening fan and the frame material are the vital problems that must be paid attention to in the design of small movable gap seals.
The four factors, such as village bureau, frame, hardware, airtight strip and its mode of action and so on, should be considered comprehensively so that they can coordinate each other in structure and stress state to achieve the purpose of sealing. It should be pointed out in particular that the clean room door
fans are bigger and heavier than clean room doors and windows fans, and the force exerted when sealing and pressing is much greater. Especially in normal times, the door and fan of clean room are always open, closed and rotated continuously. Therefore, the selection of hardware should be emphasized in controlling the sag of the door and fan of clean room and ensuring the stiffness of the door and fan of clean room.
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