Questions and answers on knowledge about differential pressure in clean room

Q: Do you know what is the clean room pressure difference? A: In the clean area, the pressure difference between each room relative to the outdoor atmosphere, we call it 'absolute pressure difference'. The pressure difference between each adjacent room and adjacent area is called 'relative pressure difference', or 'pressure difference' for short. Q: ……Well, I don’t seem to understand a bit, can you give an example? Answer: Then let me give a simple example. Suppose the absolute pressure difference of room A is P1, and the absolute pressure difference of room B is P2, then the pressure difference between A-B It is ΔP=P2-P1. Usually, we refer to both 'absolute pressure difference' and 'relative pressure difference' as 'pressure difference'. For example, when we say 'the pressure difference in room xx', we mean the 'absolute pressure difference' between the room and the outside; when we say 'the pressure difference between room xx and room xx', we mean the 'relative pressure difference between the two rooms' '. Q: So it is, I understand. What is the number of air changes in a clean room? Is it related to the pressure difference? Answer: The number of air changes is the quotient of the total air intake per unit time in a clean space divided by the volume of the space. In fact, the more pollutants in the space and the higher the cleanliness level, the more air changes are required. The number of air changes in a clean room has nothing to do with the pressure difference between the clean room and the outside world. Q: OK, I got it. After all that said, is it important to control the pressure difference in the clean room? A: Yes, it is very important. Because the air always flows from the place with high absolute pressure difference to the place with low absolute pressure difference, we must ensure that the room with higher cleanliness has higher absolute pressure difference, and the room with lower cleanliness has lower absolute pressure difference. In this way, when the clean room is working normally or the airtightness of the room is destroyed (such as opening the door), the air can flow from the area with high cleanliness to the area with low cleanliness, so that the cleanliness of the room with high cleanliness level will not be affected by the low level. Air pollution and disturbance in the room. Q: Did you talk about the definition and function of differential pressure in a clean room to reduce pollution? Correct. The purpose of maintaining the pressure difference is to ensure that the air in the clean room flows according to the preset airflow direction, so as to reduce the pollution to the product. Q: How to establish this pressure difference in the clean room? A: This is about the principle of the establishment of the pressure difference in the clean room. The amount of air leakage can maintain positive pressure, otherwise, negative pressure will be formed. For fresh air system: fresh air volume = exhaust air volume + differential pressure air volume For circulating air system: fresh air volume + return air volume = return air volume + exhaust air volume + differential pressure air volume Therefore, the clean room only needs to satisfy: fresh air volume = exhaust air volume + Maintaining the differential pressure air volume can maintain the differential pressure balance. Q: So it turns out, how do we control the pressure difference? This is to talk about, take out a small notebook and take notes! I will mainly talk about the following nine points~ 1. Regularly replace the fresh air filter to prevent Reduce the pressure drop caused by the blockage of the fresh air filter. 2. Regularly replace the primary and medium-efficiency filters to reduce the confusion of pressure differences caused by fluctuations in the air supply volume. 3. Do not open and close the door frequently, so as to avoid the failure of the automatic control system and the disorder of the pressure difference. 4. Reduce the time of opening and closing the door each time, so as to avoid the leakage of air volume and the reduction of pressure difference exceeding the adjustment range of the system. 5. The door must be closed tightly, otherwise the air leakage will be too large and the pressure difference will be chaotic. 6. Using the automatic door, you can set the opening time, holding time and closing time to ensure that the pressure difference is not affected by great fluctuations. 7. Regularly check the tightness of each door. 8. Regularly check the on-site differential pressure device and display data. 9. Monitor the data of the online differential pressure display system at any time, keep abreast of the situation at the scene, and promptly remind the operator to pay attention to the stable maintenance of the differential pressure

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