Novel ventilation cabinet for lab

Abstract

The invention discloses a novel ventilation cabinet for a lab. The novel ventilation cabinet comprises a cabinet body, a gas concentration detector, exhaust devices and a control unit. The gas concentration detector is arranged in the cabinet body, and is used for detecting the concentration of toxic and harmless gas in the cabinet body. The exhaust devices comprise a first exhaust device, a second exhaust device and a third exhaust device. The control unit obtains the concentration of the toxic and harmless gas in the cabinet body through the gas concentration detector. Three preset concentration values are stored in the control unit, and are C1, C2 and C3. The control unit controls the first exhaust device, the second exhaust device and the third exhaust device to operate dynamically according to the relation between the detection values C of the gas concentration detector and the three preset concentration values. Furthermore, when the control unit adopts the lower-grade exhaust mode, the control unit further judges the interval values of the concentrations to judge whether a higher-grade exhaust mode is adopted or not, so that the rapid exhaust of the toxic and harmless gas in the cabinet is ensured.

Description

technical field [0001] The invention relates to the technical field of laboratory equipment, in particular to a novel fume hood for laboratories. Background technique [0002] The fume hood is a kind of ventilation equipment widely used in the laboratories of various colleges and scientific research units. There are various types of fume hoods and tight protection, which not only provide comprehensive protection for experimental operators, but also can withstand the corrosion of various chemical acids and alkalis and organic reagents, and will not contaminate the experimental samples inside. It ensures the smooth discharge of toxic, harmful and odorous gases, and makes the experimental environment meet the safety effect stipulated by national regulations. The switching and selection of the ventilation level in the existing fume hood is not fine enough. When the concentration of toxic and harmful gases in the fume hood exceeds the preset detection value, the method of increa...

AI Technical Summary

Problems solved by technology

The switching and selection of the ventilation level in the existing fume hood is not fine enough. When the concentration of toxic and harmful gases in the fume hood exceeds the preset detection value, the method of increasing the ventilation rate is often used to increase the gas circulation in the fume hood. Speed, because the switching and selection of the ventilation level of the fume hood is not fine enough, it may cause the disadvantage of not being thorough in the discharge of toxic and harmful gases, which will affect the safety environment of the laboratory and even affect the personal safety of the experimental operators. Therefore, It is especially necessary to detect the concentration of toxic and harmful gases in the fume hood in real time, and to select the corresponding ventilation strategy according to the detected value

Images