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Forms and characteristics of laminar flow hoods
Forms and characteristics of laminar flow hoods(I) FFU laminar flow hoodsThe full name of FFU laminar flow hoods is Fan Filter Units. Specifically, they are modular terminal air supply devices with self-power and filtering functions. The fan draws air from the top of the FFU and filters it through HEPA. The filtered clean air is evenly delivered at a wind speed of 0.45m/s±20% on the air outlet surface. FFU laminar flow hoods have the following characteristics: Negative pressure air supply: Since the FFU is closely connected to the high-efficiency filter, the air passes through the fan and directly enters the clean area through the high-efficiency filter as negative pressure. The joints between the FFU and the filter are in the static pressure box. Even if there is a leak, it will be sent to the high-efficiency filter through the FFU. The unfiltered air will not contaminate the high-efficiency filter. If there is a leak between the keel of the static pressure box, it will also enter the negative pressure box from the clean area, so there is no risk of leakage in the static pressure box. Static pressure box equalizes pressure: A static pressure box is needed on the upper part of the FFU to equalize the pressure and make the air supply uniform. It is usually welded with stainless steel plates, separated by colored steel plates, and sealed with silicone. Low height, space-saving: The FFU laminar flow hood is low in height, and the system design always saves air chamber space. Lightweight structure design: It is very suitable for the Grid system installation of major manufacturers, and the design of the FFU structure size can be changed according to the Grid system. Uniform wind pressure diffusion: The diffuser plate inside the FFU is installed, the wind pressure diffusion is very uniform, and the wind speed on the air outlet is also stable and uniform. Metal structure downwind duct liner: aging, eliminates secondary pollution, smooth surface, low wind resistance, and excellent sound insulation effect. Reasonable design of air inlet and air duct: reduce pressure loss and noise. High motor efficiency: The system consumes low current and saves energy costs. Single-phase motor, adjustable speed: Provide three-stage speed regulation, which can increase or decrease wind speed and air volume according to actual conditions. FFU laminar flow hoods can be connected and used modularly, making FFU widely used in clean rooms, clean operating tables, clean production lines, assembled clean rooms, and local Class 100 applications. (II) Fan-type laminar flow hoods Fan-type laminar flow hoods achieve positive pressure air supply and have various forms and characteristics according to different needs. Fan-type laminar flow hoods usually have the following characteristics: Positive pressure air supply: The air is sent into the laminar flow hood through the fan to form a positive pressure environment, ensuring that the air flows to the clean area and preventing external pollutants from entering. Various forms: According to different application scenarios and needs, it can be designed into ceiling hanging, suspended screw hanging, frame type, and other forms to meet different installation requirements. Various air intake methods: Top air intake or side air intake can be used. According to actual conditions, the appropriate air intake method can be selected to achieve the best air purification effect. Flexible air supply form: top or side air intake, bottom air outlet, the air outlet is preferably within 1 meter from the work area table, and can be adjusted according to specific process requirements. Configurable accessories: lighting fixtures, ultraviolet sterilization lamps, anti-static soft curtains, and other accessories can be configured as needed to improve the function and applicability of the laminar flow hood. Three-speed speed regulation: The control method is three-speed speed regulation, and the outlet wind speed is about 0.45-0.65m/s, which can be adjusted according to different work needs. Fan-type laminar flow hoods are also widely used in the pharmaceutical industry. For example, in some process links that require a positive pressure environment, such as drug weighing and packaging, they can effectively prevent dust and reagents from overflowing and ensure the safety of operators. At the same time, fan-type laminar flow hoods can also be designed and configured according to different clean-level requirements to meet the various needs of pharmaceutical companies. |
