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Purification knowledge of 100,000-level dust-free workshop


Airflow → Purification of primary effect → Air conditioning → Purification of intermediate effect → Air supply duct of fan → Effective purification air outlet → Blow into the room → Bring away particles such as dust and bacteria → Return air shutters → Primary effect purification Repeat the above process to achieve the purpose of purification.
In order to ensure the air cleanliness requirements of the product production environment or other uses of clean rooms, a number of comprehensive technical measures must be adopted.
1. Adopt production technology and equipment that produce less pollutants;
2. Take necessary isolation negative pressure measures to prevent the pollutants produced by the production process from spreading to the surroundings;
3. Reduce the pollutants brought by people and materials into the room;
4. Strengthen the management of clean rooms, and perform cleaning, sterilization, etc. according to regulations;
5. People and things must be diverted, and people and logistics are not allowed to cross each other.
Compared with the general air flow organization, the air flow organization of the air flow type clean room is significantly different. The reasonable design of the air flow pattern and distribution in the clean room is called the airflow pattern. Clean room airflow patterns are mainly divided into three categories: unidirectional flow, non-unidirectional flow, mixed flow.
Unidirectional flow refers to the air flow that is equal in flow in one direction and has the same wind speed on the cross section. It is divided into horizontal unidirectional flow and vertical unidirectional flow.
The unidirectional flow of clean room air flows smoothly from the indoor air supply side to its corresponding return air side. Its main characteristics are as follows: the dust bacteria pollutants emitted by the pollution source are compressed before they diffuse into the room. Outdoor, mainly used in higher-level occasions.
Non-unidirectional flow is a non-uniform air flow distribution method, and its speed and direction are different in different places in the clean room. It is the most common air flow organization form in clean rooms.
The airflow organization form is divided into top-feeding, side-backing; side-feeding, side-backing; top-feeding, top-backing, etc. according to different installation methods of high-efficiency filters and return air outlets. Its characteristics are: when the dust and bacterial pollutants emitted from the pollution source diffuse indoors, the pollutants are diluted and diluted with clean air treated with high-efficiency filters, and the required air cleanliness level is maintained from the child.
Mixed flow is a combination of non-unidirectional flow pattern and unidirectional flow pattern in the same clean room. Its characteristics are: unidirectional flow pattern is used in the place where high air cleanliness is required, and other non-unidirectional flow pattern. It not only meets the requirements for use, but also saves equipment investment and operating costs.

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