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What are the environmental requirements for clean sheds?
What are the environmental requirements for clean sheds?The environmental requirements of the clean shed are mainly reflected in the following aspects:Space and layout requirements Space size: The clean shed needs to have enough space for installation and use, and some space should be reserved around it to facilitate personnel operation, equipment maintenance, and air circulation. In general, a distance of at least 0.8-1 meters should be maintained between the clean shed and the surrounding walls or obstacles. Ground requirements: The ground should be smooth, smooth, wear-resistant, corrosion-resistant, and have good anti-static performance. The roughness of the ground should be controlled within a certain range, such as a height difference of no more than 2-3 mm per square meter, to prevent the accumulation of water and dust, and to facilitate the installation and movement of the clean shed. Layout rationality: The clean shed should be far from the source of pollution, such as the painting area in the production workshop, welding area, etc., and the distance from these areas should be based on the strength and nature of the source of pollution, generally not less than 10-15 meters. At the same time, it is necessary to consider the coordination with other production equipment or working areas to ensure the smooth flow of logistics and people to avoid cross-contamination and mutual interference. Temperature and humidity requirements Temperature: Under normal circumstances, the temperature in the clean shed should be controlled between 18-26 ° C. For some processes with more stringent temperature requirements, such as electronic chip manufacturing, precision instrument assembly, etc., the temperature fluctuation range may need to be controlled at ±1 ° C or even smaller. Humidity: The relative humidity in the clean shed is usually required to be maintained between 40%-60%. Too high humidity is likely to cause microbial breeding and moisture, while too low humidity may generate static electricity, causing damage to electronic products. For some special processes, such as optical lens production, humidity may need to be controlled within a narrower range, such as 45%-55%. Airflow and ventilation requirements Airflow organization: Clean shed usually adopts the form of vertical one-way flow or horizontal one-way flow to ensure the uniform flow of air and the effective discharge of pollutants. The airflow speed should be adjusted according to the level and use of the clean shed, in general, the airflow speed of the vertical one-way flow is between 0.3-0.5m/s, and the airflow speed of the horizontal one-way flow is between 0.25-0.4m/s. Ventilation: To ensure fresh and clean air in the clean shed, a good ventilation system is required. The number of ventilation and ventilation should be calculated according to the size of the clean shed, the number of personnel, the heat of the equipment, and other factors, and the number of ventilation and ventilation per hour is generally required to be no less than 15-20 times. Electromagnetic environmental requirements Electromagnetic interference: There are more electronic equipment and instruments in the clean shed, and external electromagnetic interference sources should be avoided as far as possible. The clean shed should be away from large motors, transformers, radio frequency emission sources, and other strong electromagnetic interference sources, and the distance from these interference sources should generally not be less than 5-10 meters. Electromagnetic shielding: For some clean sheds with high requirements for electromagnetic environment, such as high-precision electronic measurement, quantum technology research, and other places, electromagnetic shielding measures may need to be taken, such as installing electromagnetic shielding materials in the wall, ceiling, and floor of the clean shed to reduce the intrusion of external electromagnetic signals and the leakage of internal electromagnetic signals. Noise environment requirement Noise limit: The noise level in the clean shed should meet the requirements of the relevant standards and specifications, in general, the noise should not exceed 65-70 decibels. Excessive noise will affect the work efficiency and health of the operator, and may also interfere with some high-precision experiments and production processes. Noise source control: The noise source in the clean room should be controlled, such as the selection of low-noise fans, air conditioning equipment, etc., and effective vibration reduction and noise reduction measures should be taken, such as the installation of vibration reduction pads and mufflers. |
