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The laminar flow hood is divided into several parts
The laminar flow hood is divided into several partsLaminar flow hoods can generally be divided into the following main parts:First, air filtration system Primary filter This is the first line of defense in the laminar hood filtration system. It is usually made of non-woven fabrics and other materials, mainly used to filter larger dust particles in the air, such as dust and fibers greater than 5μm. The aim is to protect subsequent medium and high-efficiency filters and extend their service life. For example, in the general industrial production workshop environment, the primary filter can intercept large particles of impurities entering from the workshop vent, such as cotton wool, paper scraps, etc. Medium effect filter The medium effect filter can filter 1-5 μm suspended particles, such as pollen, mold spores, etc. Its filtration efficiency is generally about 60%-90%, which further purifies the air based on the initial effect filter. In the laminar flow cover of the clean operating room in the hospital, the medium effect filter can effectively remove part of the bacteria and microbial carriers in the air, creating a relatively clean air environment for the operating room. High Efficiency Filter (HEPA) The Hepa filter is a key component in the laminar flow hood to ensure air quality. It can filter out particles of 0.3μm and above. For some places with high air quality requirements, such as electronic chip manufacturing workshops, and high-level biological laboratories, its filtration efficiency can reach more than 99.97%. HEPA filters can effectively remove bacteria, viruses, and ultra-fine particles from the air, ensuring that the air in the work area is almost sterile. Second, fan system Centrifugal fan or axial flow fan The fan is the power source of air circulation in the laminar flow hood. The centrifugal fan has the characteristics of large wind pressure, which is suitable for laminar flow hood systems that need to overcome large resistance, such as in the case of efficient filtration with large filtration resistance, to ensure sufficient air volume through the filter. The axial flow fan has a large flow rate and relatively small wind pressure and is often used for laminar flow hoods that have low resistance requirements but require large airflow, such as some ordinary clean worktables. The performance of the fan directly affects the airflow velocity and uniformity in the laminar flow hood, which is the key factor in maintaining the laminar flow state. 3. Work Area Operating surface (if available) This is the area where the actual operation takes place, for example in a laminar flow hood in a laboratory, where the operating table is where the laboratory instruments and samples are placed. The operating table is generally made of easy-to-clean, corrosion-resistant materials, such as stainless steel, to ensure no contaminants are generated during the operation, and to facilitate disinfection and cleaning. The operating table under the laminar flow cover in the pharmaceutical industry has a smooth and flat surface to prevent residues such as drug powder. Lighting system Provide sufficient light to the work area so that the operator can see the operation process. The lighting system usually uses fluorescent or LED lights, and its brightness and color temperature can be adjusted according to actual needs. In some electronic component assembly laminar hoods with high visual requirements, good lighting can help operators accurately carry out fine assembly work. 4. Shell and support structure shell The housing protects the internal components and directs the airflow. It is usually made of metal or plastic and has a certain strength and tightness. The housing is designed to take into account the direction of the airflow so that it can work with the internal filtration system and fan system to form a stable laminar flow. For example, the design of the outlet and intake positions of the housing will affect the circulation path of the air, thus affecting the laminar flow effect. Support structure The support structure holds the internal components, including filters, fans, and work area components. It should ensure the stability of the laminar flow hood during installation and use and prevent factors such as vibration from affecting its normal operation. In some large industrial laminar hoods, the support structure may also include adjustable brackets for adjusting the height and Angle of the laminar hoods to suit different working scenarios. |
