Technical information_Clean room door and window gap treatment technology

Most of the clean room doors and windows have three types of structural gaps in common. The first category is the combined splicing and the installation gap between the shutter and the clean room door; the second category is the lap joint between the shutter and the opening fan; the third category is the installation gap of glass or other core boards. The air leakage of the clean room door usually mentioned is nothing more than the problem caused by the above three kinds of gaps. Among these three kinds of structural gaps, the first and third types belong to fixed gaps, and the second type belongs to movable gaps. The properties are different and their proportions on clean room doors and windows are also different. Therefore, the airtight measures taken to seal the doors and windows of the clean room are not exactly the same, which is also an important step in the dust-free evolution project. A. Treatment of fixed gaps The installation gaps checked are not only relatively small in number of doors and windows in each clean room, but also the combination of the door and the opening is relatively hidden after decoration, and it is a fixed gap that is easier to seal. The connection between the edge and the periphery of the opening should be firm, not only for closed clean room doors and windows, but also for the structure of general clean room doors and windows. Due to the large and violent force of the clean room door, special attention should be paid to the process and the opening in the fixation of the clean room door. Whether the surrounding fixing points are firm and stable, but for closed clean room doors and windows, it must also be emphasized that the gap between the cavity and the clean room door opening or window tongs is filled tightly, and then covered with indoor and outdoor wall decoration layers can basically guarantee. The air tightness of this type of gap, the second type of fixed gap is the installation gap of glass or other core boards. The number of gaps in a clean room door is relatively small, but it is often the main part in the structural gap of a cavity window, especially for external windows, which are exposed to the atmosphere and are affected by the outdoor climate. It must be handled with care. On the one hand, the installation gap of the core glass should be minimized, and on the other hand, the fortification structure should be carefully selected. B. Treatment of movable gaps How to overlap the opening fan and frame material of clean room doors and windows is the key to the sealing design of clean room doors and windows. The gap at the lap joint is different from the fixed gap, because the movable fan needs to be opened and the 'once and for all' sealing measures can be taken. Compared with the window, the opening fan of the clean room door is larger, and the movable gap accounts for a larger proportion of the total number of structural gaps in a pinch of the clean room door. The working conditions of the gaps around the door are also more complicated. Taking a single-leaf open clean room door as an example, the sides along the vertical direction are small. The direction of force applied to the bore due to the rotation of the fan is completely different from the other three sides. The threshold part of the clean room must be specially structured according to different requirements such as transportation and pedestrians. There are three sides of the four-sided gap of a single-leaf flat open clean room door that need to be treated differently, and the middle gap of the double-leaf clean room door is also a special structure. Therefore, the sealing treatment of movable gaps is a more prominent problem in the design of clean room doors. The size and form of the notch where the opening fan and the frame material overlap each other are important issues that must be paid attention to when the seal design of the movable gap is small. The four factors of the village bureau, frame, hardware, airtight strip and its mode of action should be considered comprehensively, so that they can coordinate with each other in terms of structural failure and stress state to achieve the purpose of sealing. It should be specially pointed out that the clean room door is larger and heavier than the window sash, and the force is much larger when sealing and pressing, especially when it is always opened and closed continuously, so it is necessary to control the sag of the clean room door and ensure the rigidity of the clean room door. Let's focus on the selection of hardware. 2. Gap sealing of casement clean room door The casement closed clean room door is the most used type of clean room door in the clean pharmaceutical cleanroom. It is usually used for passage or transportation. It is very convenient for emergency evacuation in case of fire. Generally, the elastic material of the forming section is used as the sealing strip to be fixed and sealed at the seam. The opening width of common clean room doors is mostly below 1800mm for the double-leaf inner clean room door, and 2100mm or less for the double-leaf outer clean room door; the height of the opening is probably within 2400mm. The setting of the airtight strip. In the case of frequent opening and closing of clean room doors, except for some clean room doors, in order to avoid heavy pharma machinery and other transportation, the airtight strips may be set on the clean room door and the collision surface of the clean room door. The room door is not allowed to set the clean room threshold on the ground due to the transportation of the pharmaceutical cleanroom. Only the hanging type sweeping airtight bar can be installed at the bottom of the clean room door close to the ground. Touching, less affected by pedestrians and transportation, more elastic sealing strips with a small section of a few millimeters in length and width are laid on the hidden grooves of the clean room door lift, and then pressed by the closing of the clean room door leaf. The sealing strip should be laid continuously along the perimeter of the movable gap.In order to form a trapped closed annular sealing line after the clean room door is closed. When the sealing strips are set at the clean room door and the clean room door, it is necessary to pay attention to the good connection of the pottery, and minimize the small gap between the sealing strips at the clean room door seam.
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