Publish Time: 2021-12-02 Origin: Site
The fume hood is a very important ventilation equipment in the laboratory. It is indispensable in the construction of the laboratory. As the main ventilation equipment in the laboratory, it can discharge the exhaust gas of the laboratory outdoors and provide a good environment for the laboratory.
Among modern inspection equipment, there are fume hoods, laboratory benches, medicine cabinets, appliance cabinets, cylinder cabinets, etc. Fume hood is a very important function in biochemical laboratory equipment, and it is an indispensable equipment. Therefore, the selection of fume hoods is an important issue in laboratory construction, and sufficient attention must be paid. The main function of the hood is the exhaust function. In the chemical laboratory, various harmful gases, odors, humidity, flammable, explosive and corrosive substances will be generated during the experimental operation. In order to protect the safety of users and prevent the pollutants in the experiment from spreading to the laboratory, smoke cabinets should be used near the pollution source. In the past, a small number of smoke cabinets were used, and a large number of thermal experiments were only generated in particularly harmful and dangerous gases. The hood only assumes the auxiliary functions of the test bench. In recent years, considering the improvement of the experimental environment, the experiments carried out on the test bench have gradually been transferred to the hood, which requires that the hood should have the most suitable function for the use of equipment. Especially in most newly built laboratories, air conditioning is necessary, so in the initial design stage of the building, the number of fume hoods should be included in the air conditioning system planning. As ventilators occupy a very important position in biochemical laboratories, the number of fume hoods has increased sharply in terms of improving the laboratory environment, improving labor sanitation conditions, and improving work efficiency.
The laboratory fume hood is the terminal equipment of the indoor exhaust system of the laboratory building. The main purpose is to limit the handling of pollutants to its cabinet. Pollutants can be pumped outdoors, just like the water in the toilet, because the indoor air is pumped away, so it also plays a role in refreshing the old air in the laboratory. If the fume hood and the fresh air outlet are arranged properly, it is equivalent to the cleaning effect of purifying the old indoor air into the exhaust hood. Both of these functions are required by the laboratory. Smoke hoods are negative pressure equipment that operates on the front line of pollution sources and are the first line of defense for laboratory protection. Whether the chemical contaminants can be guaranteed not to escape is very important. The auxiliary fume hood is a fume hood whose main consideration is energy saving. In order to reduce the extraction of indoor air, the air is introduced into the cabinet or in front of the cabinet from the outside, and then extracted through the fume hood. The design principle of most auxiliary fume hoods is that 70% uses auxiliary air and 30% comes from indoors. However, due to the lack of real-time detection means, these two percentages are ideal values.
There are many types of laboratory fume hoods. Common ventilators can be divided into all steel, stainless steel, PP, etc. The table surface is directly in contact with the experimental sample, and is usually composed of epoxy resin board, solidified board, stainless steel board, PVC, ceramics and other materials. All-steel fume hoods are generally suitable for laboratories and are relatively common. PP fume hoods are generally suitable for chemical laboratories and have better acid and alkali resistance. FRP fume hood has strong corrosion resistance: FRP has a wide range of corrosion resistance and is suitable for acid and alkali gases. Poisonous and harmful gases and organic solvent gases, as well as operating locations and occasions where dust is generated. For laboratories requiring high cleanliness, it is recommended to use stainless steel fume hoods that are dust-free, easy to clean, anti-corrosive, and have good acid and alkali protection.