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What are the classifications of cleanrooms?
What are the classifications of cleanrooms?A clean room is an enclosed space where air cleanliness, temperature, humidity, pressure, noise, and other parameters are controlled as needed.Classification according to the flow state of airflow According to the flow state of the airflow, there are mainly the following three types of airflow distribution in the clean room: (1) non-unidirectional flow clean room: formerly often referred to as turbulent flow clean room, the indoor airflow is not all flowing in a single direction. Non-unidirectional flow clean room has several common features: the terminal filter (high efficiency or sub-high efficiency) is as close as possible to the clean room, it can be the air supply or directly connected to the air supply, can also be received in the room air supply on the static pressure box; back to the air are located in the lower part of the clean room, the purpose is to avoid the phenomenon of "dust". Non-unidirectional flow clean room is eddy current exists, not suitable for high cleanliness of the clean room, should be used for 6 ~ 9 level of the clean room. (2) Unidirectional flow clean room: Unidirectional flow clean room airflow is characterized by parallel streamlines, flowing in a single direction, and in the cross-section of the wind speed is the same, there is a vertical unidirectional clean room, quasi-vertical unidirectional flow, horizontal unidirectional flow clean room and so on. (3) Vector clean room: in the upper corner of the room side of the air supply, using fan-shaped high-efficiency filters, but also with ordinary high-efficiency filters with fan-shaped air supply, in the lower part of the other side of the air return, the room's height and length ratio of 0.5 ~ 1 between the general desirable. This kind of clean room can also reach class 5 (class 100) cleanliness. Cleanroom flow type is the above three types, but the actual application can be evolved in many forms. A clean room can be a mixed flow type combining unidirectional and non-unidirectional flow to achieve a high level of cleanliness in a local area (unidirectional flow section). For example, a horizontal unidirectional flow "tunnel" (open on one side) is set up in the clean room, and the rest of the cleanroom is a vortex unidirectional flow pattern to achieve Class 5 or higher cleanliness in the "tunnel" portion, and workstations are located in the "tunnel". Inside the "tunnel". Divided by the nature of the controlled particles (1) Industrial clean room: The controlled particles are non-biological particles such as dust. (2) Biological clean room: Clean room where the controlled particles are biological. |
