Purchasing clean shed and installation instructions
As a buyer, there are many precautions for purchasing clean sheds and installing and designing clean sheds. There are many airflow factors that affect clean sheds, such as clean shed manufacturers, process equipment, personnel, clean room assembly materials, lighting appliances, etc., and for the airflow above production equipment The diversion point should also be considered.
Generally, the air flow diversion point on the surface of the operating table or production equipment should be located at 2/3 between the clean room space and the partition wall, so that the air flow can flow from the inside of the process area to the work area when the operator The dust is taken away; if the diversion point is arranged in front of the process area, it will become an improper air flow. At this time, most of the air flow will flow to the process area, and the dust caused by the operator's operation will be taken to the back of the equipment. As a result, Taiwan will be contaminated, and the yield rate will inevitably decrease.
Obstacles such as work desks in the clean room will have eddy currents at the junctions, and the cleanliness near them will be relatively poor. Drilling return air holes on the work desks will minimize the eddy currents; assembling Whether the selection of materials is appropriate and whether the equipment layout is complete are also important factors for whether airflow becomes a vortex phenomenon.
The air blower sucks in air from the top of the FFU, and is filtered by the primary filter and high efficiency filter. The filtered clean air is sent out to the clean shed at a uniform speed of 0.45m/s±20% on the entire air outlet surface. A current-sharing layer is formed to make the clean air flow in a vertical unidirectional flow, thus ensuring the cleanliness required in the working area.
The clean shed is a simple clean room that can be quickly assembled. It has the characteristics of fast installation, short construction period, low price, and convenient movement. Controlling the main production processes in a small environment is also the best choice for clean room design.
The airflow in the clean shed is an important factor affecting the performance of the clean room. Generally, the airflow speed of the clean room is selected between 0.25 and 0.5m/s. Confusion. Although increasing the wind speed can suppress the influence of this disturbance and maintain cleanliness, the increase in wind speed will affect the increase in operating costs. Therefore, it should be able to supply at the most appropriate wind speed when the required cleanliness level is met. In order to achieve the appropriate wind speed supply to achieve economic results.
On the other hand, in order to achieve a stable effect of clean room cleanliness, the maintenance of uniform airflow is also an important factor. If uniform airflow cannot be maintained, it means that the wind speed is different, especially on the wall surface. Achieving high cleanliness is actually very difficult.
To maintain a uniform air flow in the vertical laminar flow direction, it is necessary to: (a) The wind speed of the blowing surface must not have a speed difference; (b) The wind speed of the suction surface of the floor return plate must not have a speed difference. The vortex phenomenon will occur if the speed is too low or too high (0.2m/s, 0.7m/s), while the speed of 0.5m/s, the airflow is more uniform. At present, the wind speed of the general clean room is 0.25~0.5 between m/s.