In dust-free room, there will be eddy current in the working table and other obstacles at the junction. Relatively, the cleanliness near the working table will be poor. The factors are those that drill air return holes on the working table, which will minimize the eddy current phenomenon. The proper selection of assembly materials and the perfect layout of equipment are also important factors for whether air flow becomes eddy current phenomenon. So? Come and see with Xiaobian.
There are many factors affecting the airflow in the dust-free room, such as process equipment, dust-free room assembly materials, lighting appliances, etc. At the same time, the diversion point of airflow above the production equipment should also be considered.
The air flow diversion points on the surface of general operating table or production equipment should be located at the distance of 2/3 between the dust-free room space and partition board, so that the air flow can flow from the inside of the process area to the work area while the dust will be taken away; if the diversion points are arranged in front of the process area, it will become an improper air flow diversion, at this time most of the air flow will flow to the process. After the area, the dust caused by operator operation will be brought to the back of the equipment, the worktable will be polluted, and the yield will be reduced.
In order to maintain uniform air flow in the vertical laminar direction, it is necessary to: (a) there is no difference in velocity between the outgoing air velocity and (b) there is no difference in velocity between the suction surface of the floor return air plate. When the velocity is too low or too high (0.2m/s, 0.7m/s), eddy currents occur, while when the velocity is 0.5m/s, the air flow is more uniform (in 1980s and 1990s) in general dust-free chambers, and the wind speed is between 0.25 and 0.5m/s.