Some Key Points of Clean Room Design
Cleanliness of the air supply
To ensure that the cleanliness of air supply meets the requirements, the key point is the performance and installation of the final stage filter of the purification system. The final filter of the purification system is generally a high efficiency filter or a sub-high efficiency filter. Considering the cleanliness requirements, the principle is to select low-performance filters for low-grade clean rooms and high-performance filters for high-level clean rooms. In fact, to choose a good filter, it is necessary to fully consider the characteristics of clean room, filter and purification system.
Installation of filters
To ensure the cleanliness of the air supply, it is also necessary to ensure that the filter cannot be damaged during transportation and installation. And to ensure that the filter installation is tight. For a single filter, the open-mounted type is used, so that even if leakage occurs, it will not leak into the room; The use of finished high-efficiency air supply port, the tightness is also easier to ensure. For the tuyere with multiple filters, liquid tank seal and negative pressure seal are often used. Liquid tank sealing must ensure that the liquid tank joints are tight and the overall frame is at the same level. Negative pressure seal is to make the filter and the plenum and the outer perimeter of the frame joint in a negative pressure state, and the same as the open-mounted type even if leakage will not leak into the room.
Supply air volume and wind speed
Sufficient ventilation volume is to dilute and eliminate indoor polluted air, according to different cleanliness requirements, when the clean room net height is higher, the appropriate increase in the number of air changes. Among them, the ventilation volume of 1 million clean rooms is considered according to the high efficiency purification system, and the rest are considered according to the high efficiency purification system. When the 100,000-class clean room HEPA filter is centrally arranged in the machine room or the end of the system, the number of air changes can be appropriately increased by 10-20%.
Static pressure difference
Maintaining a certain positive pressure in the clean room is one of the essential conditions to ensure that the clean room is not contaminated or less, and to maintain the design cleanliness level. Even if it is a negative pressure clean room, it must have an adjacent room or suite that is not lower than its cleanliness level to maintain a certain positive pressure, so that the cleanliness of the negative pressure clean room can be maintained.
Suzhou Pharma Machinery Co.,Ltd.
2025/02/12
Tia
