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Equipment that Provides a Locally Clean Environment - Laminar Flow Hoods
A laminar flow hood is a device used to provide a localized clean environment.
Ⅰ. Working principle
The core principle of laminar flow hood is to pass air through high-efficiency particulate air (HEPA) or ultra high efficiency particulate air (ULPA) filters, and the filtered air is discharged vertically or horizontally in a laminar manner (i.e. stable and uniform airflow). Laminar flow can carry out pollutants such as dust particles generated in the work area at a stable speed, avoiding the accumulation of pollutants in local areas and ensuring the cleanliness of the air in the work area.
Ⅱ. Structural composition
- Fan system
The fan is the power source of the laminar flow hood, responsible for inhaling air and delivering it to the filter. Its performance directly affects the air supply volume and pressure of the laminar flow hood. The selection of fans needs to be determined based on factors such as the size of the laminar flow hood, the required air volume, and resistance.
- High efficiency filters (HEPA or ULPA)
HEPA filters can effectively remove particles larger than 0.3 microns from the air, with a filtration efficiency of over 99.97%. ULPA filters have higher filtration efficiency, capable of removing particles larger than 0.12 microns with an efficiency exceeding 99.999%. These filters are key components to ensure air quality, typically made of materials such as fiberglass, and intercept particles through a multi-layer fiber structure.
- Static pressure box
The function of the static pressure box is to evenly distribute the incoming air over the entire surface of the filter. If there is no static pressure box, the air may encounter situations where the local flow velocity is too fast or too slow, affecting the filtration effect and the stability of laminar flow. The static pressure box usually has structures such as deflectors inside, which are used to regulate the direction of air flow and pressure distribution.
- Shell
The shell mainly serves to protect internal components and guide airflow. The shell material is usually made of stainless steel, aluminum alloy, or plastic, and needs to have a certain strength and sealing to prevent unfiltered air from entering the work area. The shape and size of the shell are designed according to specific application scenarios, generally including squares, rectangles, etc.
Ⅲ. Application Fields
- Pharmaceutical industry
In the aseptic filling process of drug production, laminar flow hoods can provide a clean air environment for filling equipment and filling areas, preventing microbial and particle contamination of drugs. For example, in the production process of injections, laminar flow hoods can ensure that the liquid medicine is not contaminated by bacteria, dust, and other pollutants in the air during injection into ampoules or penicillin bottles, ensuring the quality and safety of the drugs.
- Electronic industry
For high-precision production processes such as electronic chip manufacturing, even tiny dust particles can cause chip failures such as short circuits. The laminar flow hood can provide a clean working environment for key processes such as photolithography and etching of chips, ensuring the performance and yield of electronic products. For example, in a semiconductor manufacturing workshop, laminar flow fume hoods maintain the air cleanliness in the work area at level 100 (no more than 100 particles larger than 0.5 microns per cubic foot of air) or even higher standards.
- Laboratory research
In some laboratories that require extremely high environmental cleanliness, such as microbiology laboratories, cell culture laboratories, etc., laminar flow hoods can be used to protect experimental samples from external pollution. In the process of cell culture, the clean environment provided by laminar flow hood is conducive to the normal growth and reproduction of cells, and prevents external microorganisms such as bacteria and fungi from interfering with experimental results.
Suzhou Pharma Machinery Co., Ltd.
2025/03/24
Alice
