Safety of fume hood
Safety is the most important mission of ventilators. The use of ventilation cabinets in laboratories is to ensure the safety of users and prevent pollution to the surrounding environment.
1. Use the single-seam exhaust structure to effectively discharge the harmful gas.
2. The flow line hand holds, the hand to leave the space between the glass because the air on the surface of the flow is rotating, from the surface to ensure the effective air intake.
3. Set up the Windows anti-drop pin, in case the steel wire rope shedding glass window unexpectedly drops, have the anti-drop pin will catch, prevent the collision personnel.
4. Glass window adopts toughened glass, even if the glass is accidentally damaged or explodes, there will be no hurtful accident.
5. The ventilation cabinet shall have ventilation holes in the upper part of the cabinet. Even if the glass window is closed, it can enter the air and avoid creating a greater negative pressure.
6. The hood of the fume hood shall be made of metal material. The inner cavity selects the anti-double board, the stainless steel plate and so on flame retardant or non-combustible materials, the mesa chooses the solid core physical and chemical board or stainless steel plate to prevent acid base, heat resistance, flame retardant.
7. The glass window has an effective height of 800mm, the inner cavity is 1200mm, and the height of the mesa is 800mm, which is in line with ergonomics. It is easy to operate, with large space and high security.
8. It is more convenient and safer to operate the remote operator in the cabinet with the nozzle outside.
The fume hood must also be safe when used
1).Before the experiment begins, it is necessary to confirm that the fume hood should be in a running state before the experimental operation can be carried out.
2).At least five minutes before the end of the experiment, the ventilator can be turned off to discharge the residual gas in the pipe. It can also be considered to install the exhaust time delay device to ensure that the ventilator is delayed.
3).In the experiment, do not put any equipment in 150mm from the glass window. The large experimental equipment should have sufficient space, and should not affect the flow of air. The front window should be turned off as much as possible.
Selection of fume hood
When building in the laboratory, select the fume hood and determine the installation location of the fume hood. According to the experimental content, the type, material and shape of the fume hood shall be selected. The following:
1).Drug used: when using organic or other special reagent tests, take full account of the wind speed. Heat source: when using a device with a heat source, it is necessary to consider the amount of ventilation required to determine the power of the ventilator when its heat exceeds 2000 CAL/hour.
2).In the case of radioactive substances or perchloric acid experiment, a special ventilation cabinet shall be selected, and its inlet wind speed must be set to be greater than 0.5 m/s.
3).When conducting experiments with large equipment, it is necessary to take into account the effective size of the interior and set aside the necessary space for the exhaust air.
4).Material: in the use of special acid experiments, the material of fume hood should be considered, such as the semiconductor industry, corrosion industry and so on must be made with anti-corrosion materials.
5).Size: according to the experimental content, the size of the body is selected, and the volume is too large to cause wave waste.
6).Environmental protection: the harmful gases emitted must ensure that the corresponding purification devices should be installed if they exceed the national health standards if they exceed the national environmental protection requirements.
7).Conserve energy: try to save energy, in heating or air conditioning rooms should adopt a ventilation cabinet or a ventilation cabinet with air volume control. When selecting fan, it is also necessary to determine its power according to the need, not to blindly increase the exhaust volume and pressure, which can be used to reduce the power consumption of the inverter or the variable wind fan.
In the fume hood installation position should be avoided for road and personnel through frequent site, avoid congestion window ventilated daylighting and bad place, avoid obscured the inward and outward impact the door switch, avoid opposed and placed at the corner of wall.
In the modern research laboratory, advanced scientific instruments, perfect experimental equipment and good experimental environment are necessary conditions for improving scientific and technological level and promoting scientific research results. Putting people first, ensuring safety and improving efficiency is the biggest mission of laboratory construction. As the important experimental facilities in the biochemistry laboratory, the fume cupboard plays an important role. Therefore, it is necessary to choose carefully the fume hood for each technical index. The function and safety of the ventilated fume hood, the unit is pure and one-sided to suppress the cost and the installation of the fume cupboard if the harm, its consequences can not be imagined, should arouse people enough attention.
In recent years, considering the improvement of the experimental environment, the experiment carried out on the experimental stage has been gradually transferred to the ventilation cabinet, which requires the most suitable function for the equipment to be used in the fume hood. In particular, most new laboratories require air conditioning, so the use of ventilation cabinets should be incorporated into the air-conditioning system in the preliminary design phase of the building. Because of the fume hood occupies very important position in the biochemical laboratory, from the improvement of laboratory environment, improve the labor hygiene conditions, improve the work efficiency into consideration, such as the use of the fume hood number by leaps and bounds.
