Key points of comprehensive measures for controlling clean rooms
1. Control pollution sources and reduce the amount of pollution. Use technologies and equipment that produce less pollutants as much as possible, or take necessary isolation and negative pressure measures to prevent the pollutants produced by the production process from spreading to the surroundings; reduce the pollution brought by people and materials into the room substance.
2. Effectively prevent outdoor pollution from invading indoors. This is the most important way to control pollution in clean rooms. It is necessary to consider methods of clean air treatment and indoor pressure control. According to different cleanliness requirements of the room, different types of clean air are fed in in different ways, and all dirty air generated in the room is removed at the same time, so that the indoor air is maintained at the required cleanliness level.
It can be seen that the clean treatment of the incoming air is a very critical link, which is why the number of air changes in the clean room greatly exceeds that of ordinary air-conditioned rooms. The smaller the cleanliness level is, the more the air exchange frequency is. For the control of indoor positive pressure, industrial clean rooms and general biological clean rooms adopt positive pressure measures.
Third, quickly and effectively exclude the pollution that has occurred indoors This is also the key to reflecting the function of the clean room. Reasonable air flow organization, that is, through the careful design of the position, size and form of the air supply and return air outlets, so that indoor air flows in a certain direction to prevent dead ends and cause secondary pollution. Different airflow organizations directly affect the difficulty of construction and the cost of the project.
Fourth, the flow rate control Clean room air must have a certain speed to prevent other factors (such as heat flow) from being disturbed, but not too large. A large flow rate will cause indoor dust to fly and cause pollution.
V. Air-tightness of the system Not only the ventilation system itself requires good air-tightness, but also the joints of various parts of the building and the places where the plumbing and electrical process pipes pass through the surrounding structure should be blocked to prevent leakage. Generally, the visible gaps and cracks cannot prevent the 0.5um particle size from passing through.
6. Architectural measures involve the design of the surrounding environment of the building, the construction of the building, the choice of materials, the plan layout, and airtightness measures. Interior decoration materials and homes with low dust generation rate and non-proliferation of microorganisms can be used.
In the production process or operation process, using air cleaning technology to control particulate pollution in the production workshop, it is necessary to use clean materials to build clean rooms. Only in a clean room can particulate pollution be effectively controlled. It can be seen that air cleaning technology is inseparable from the clean room.