Clean room doors and windows mostly have three types of structural cracks.
One is the combination of diaphragm splicing and the installation crevice between diaphragm and clean room doors’ holes.
The second type is the lap crevice between diaphragm and opening fan.
The third type is the installation gap of glass or other core boards. The air leakage of clean room doors
we often mentioned is caused by the above three kinds of cracks.
Among the three kinds of structural crevices, the first and the third belong to fixed crevices and the second belong to movable crevices. They have different properties and different proportions in clean room doors and windows. Therefore, the air-tightness measures adopted in the closure of doors and windows of clean rooms are not the same, which is also an important step in the dust-free evolutionary engineering.
A. Processing of the fixed slot and the check of the installation gap is not only a relatively small number of doors and windows in each clean room today, but also it is very convert after the decoration of combination of the diaphragm and the hole, which is relatively easy to seal the interval gap.
The connection between the edge and the periphery of the entrance should be firm, not only the closed door and window of the clean room, but also the requirement of the structure of the door and window of the general clean room. As the force of the the clean room door is large and fierce, the fixing point around the entrance of the clean room should be paid more attention and we should notice whether the distance and the fixing point around the entrance of the clean room are firm and stable. But for the closed door and window of the clean room, the filling of the crevice between the wall and the clean room holes or the window should also be close, and then covered with indoor and outdoor wall decoration layer to basically ensure the air tightness of this kind of gap, and the second kind of fixed gap is the installation gap of glass or other core board.
The number of cracks in the door of an clean room is relatively small, but it is often the main part in the structural cracks of a window, especially for the outer windows, which are exposed to the atmosphere and affected by the outdoor climate, so they should be handled carefully. On the one hand, the installation cracks of the core glass should be minimized. On the other hand, the defensive structure should be carefully selected.
B. How to overlap the opening fan and the frame material of the door and window of the clean room is the key to the sealing design of the door and window of the clean room. The gap at the overlap is different from the fixed gap, as the movable fan needs to be opened so that the wood can take "once and for all" sealing measures.
Compared with the window, 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 of a pinched clean room door. The opening times of the clean room door and fan are much more frequent than that of the window, and the working conditions of the surrounding gaps of the clean room door and fan are also more complex. Taking a single flat clean room door for an example, the two sides along the vertical direction are small, and the side of the holder is often influenced by the all kinds of friction or collision 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 important 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 door and fan of clean room are bigger and heavier than those of window, 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.
Second, the slot-sealed flat-closed clean room door of the door and fan of the open clean room is the most commonly used type of clean room door in the clean workshop. It is usually used for traffic or transportation, and is very convenient for emergency evacuation in case of fire, which is very convenient.
The elastic material of the forming section is usually chosen as the sealing strip to fix and seal at the state of the seam. The opening width of common clean room doors is less than 1800 mm in double inner clean room doors and 2100 mm in double outer clean room doors, and the height of the opening is in the range of less than 2400 mm.
The setting of the sealing strip. In the case of frequent opening and closing of the doors and fans of clean rooms, except for some outside doors, which may install the sealing strips on the doors and fans of clean rooms to avoid the transportation of the heavy equipment , or some doors of inner clean rooms are not allowed to set the doorsill of clean rooms on the ground because of workshop transportation, and only suspended sweeping can be installed at the bottom of the doors and fans of clean rooms close to the ground. In general, in order to avoid the hand model, foot step or car collision as far as possible, and less affected by the operation and transportation, the small section forming sealing strips of several millimeters in length and width is laid on the concealed groove part of the door lift of the clean room, and then tightened by the closure of the door fan of the clean room.
The sealing strip should be laid continuously along the periphery of the movable gap in order to form a trapped and closed ring sealing line after the door of the clean room closes. When the sealing strip is set at the door building and the door fan of the clean room respectively, it is necessary to pay attention to the good connection of the pottery and minimize the small gap between the airtight strip and the door crack of the clean room.
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