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What is the purpose of positive and negative pressure in a clean room?
What is the purpose of positive and negative pressure in a clean room?A clean room is the purpose of airborne particles within a certain space, bacteria, and other harmful air pollutants, and indoor temperature, cleanliness, indoor pressure, air velocity and air distribution, noise, vibration and lighting, static control within a certain range of needs, and the special design of the room, to maintain the level of cleanliness of the design is a crucial condition.What is the role of positive and negative pressure in a clean room? Positive pressure in clean room engineering. It means that under all closed doors and windows, the indoor static pressure is greater than the outdoor static pressure so that the airflow flows in the specified direction. This method makes the supply air volume of the purification system greater than the return air volume and exhaust air volume. The air in the clean room can only flow outwards to prevent the clean room from being contaminated by neighboring rooms or the outdoor environment. To ensure the positive pressure value of the clean room, the air supply, air return, and exhaust fans are well interlocked. When the system is closed, the exhaust fan is closed first, and then the fan and blower are turned back to prevent the clean room from being contaminated when the system is opened and closed. In general, the small pressure difference between different levels of a clean room is 5Pa, the small pressure difference between a clean room and a quasi-clean room is 10 Pa, and the small pressure difference between a clean room and a normal room is 15Pa. The negative pressure of the clean room project. It refers to the value that doors and windows are closed, indoor static pressure is less than outdoor static pressure, to do some biohazardous actions in the clean room, or drug dust produces strong sex in the operation process for publicity, it is necessary to use the negative pressure difference so that the pollutants are controlled in a specific range. Therefore, through the joint action of pressure difference and cleanroom sealing enclosure, a barrier protection system is formed to prevent the spread of harmful microorganisms and contamination of other areas to achieve the purpose of contamination control. |
