Exploring clean room air supply speed
The airflow in the clean room is an important factor for the cleanliness of the clean room. Generally, the airflow speed of the clean room is between 0.25 and 0.5 m/s. This airflow is a breeze area and is susceptible to movements by people and machines. Interference tends to be confusing. Although increasing the wind speed can suppress the influence of this disturbance and maintain the clean room cleanliness, the increase of wind speed will affect the increase of running cost. Therefore, when the required cleanliness level is met, The most appropriate supply of wind speed to achieve the appropriate wind speed supply to achieve economical results. On the other hand, in order to achieve the stability of clean room cleanliness, the maintenance of uniform airflow is also an important factor. If the uniform airflow cannot be maintained, it means that the wind speed is different, especially on the wall surface, and the airflow will vortex on the wall surface. It is actually very difficult to achieve high cleanliness in a clean room.
It is also very difficult to maintain a uniform airflow in the vertical laminar flow direction. The following points must be emphasized:
1. There is no difference in speed between the wind speed of the blown surface;
2. There is no difference in speed between the wind speed on the suction surface of the floor return air panel. The speed is too low or too high (0.2m / s, 0.7m / s) have vortex phenomenon, and the speed of 0.5m / s, the air flow is more uniform, the current general clean room, the wind speed is taken at 0.25 ~ Between 0.5m / s.
Factors affecting the wind speed of the clean room:
There are many factors affecting the airflow in the clean room, such as process equipment, personnel, clean room assembly materials, lighting fixtures, etc., and the diversion point of the airflow above the production equipment should also be considered.
The airflow diversion point on the surface of the general operation console or production equipment should be set at 2/3 of the distance between the clean room space and the clean room partition board. This allows the airflow to flow from the inside to the process area when the operator is working. Zone, and take away the dust; if the diversion point is placed in front of the process area, it will become an improper airflow diversion. At this time, most of the airflow will flow to the process area, and the dust caused by the operator's operation will be brought to Behind the equipment, the workbench will be contaminated and the product qualification rate will be reduced. Obstructions such as work tables in the clean room will have eddy currents at the junctions, and the cleanliness will be relatively poor in the vicinity. The return air holes on the work table will minimize the eddy current phenomenon; Whether the choice of assembly materials is appropriate, whether the layout of the clean room equipment is perfect, and whether the airflow becomes an important factor in the eddy current phenomenon.
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