Energy-saving air-supplementing ventilation cabinet

Abstract

The invention discloses an energy-saving air-supplementing ventilation cabinet, and belongs to the technical field of ventilation cabinets. The ventilation cabinet comprises an upper cabinet body, a lower cabinet body and an upper air-supplementing system, the top of the upper cabinet body is provided with a gas collecting hood connected with an exhaust fan through an exhaust pipe, an operation port of the upper cabinet body is provided with a perspective sliding door which can move in the vertical direction, and the rear side in the upper cabinet body is provided with a flow-guiding baffle; and the upper air-supplementing system comprises an upper air-supplementing fan, upper air-supplementing air pipes, an upper internal air-supplementing static pressure box and an upper external air-supplementing static pressure box, the upper external air-supplementing static pressure box and the upper internal air-supplementing static pressure box are both arranged at the top of the ventilation cabinet and located on the front side and the rear side of the sliding door correspondingly, the upper external air-supplementing static pressure box is an airtight cavity provided with an upper external air-supplementing opening in the bottom, the upper internal air-supplementing static pressure box is an airtight cavity provided with an upper internal air-supplementing opening in the bottom, and inner cavities of the upper external air-supplementing static pressure box and the upper internal air-supplementing static pressure box are connected with the upper air-supplementing fan through the upper air-supplementing air pipes correspondingly. Under the situation that the exhaust volume is smaller than that of a traditional ventilation cabinet, the overall blowdown effect of the ventilation cabinet can be ensured, and energy consumption is low.

Description

technical field [0001] The invention relates to a fume hood, in particular to an energy-saving supplementary air fume hood, which belongs to the technical field of fume hoods. Background technique [0002] As an important local ventilation equipment for environmental control in chemical laboratories, fume hoods are an important part of ensuring the health and safety of chemical researchers. They are widely used in laboratories of institutions of higher learning, government agencies and enterprises. When scientific researchers operate chemical experiments on the operating table in the fume hood, under the negative pressure generated by the fume hood exhaust fan, the air will first flow into the fume hood through the operating port of the fume hood, and then pass through the operating table in the cabinet The poisonous and harmful gas pollutants produced in the polluted area are taken away and discharged to the outside. Therefore, the fume hood is of great significance to the...

AI Technical Summary

Problems solved by technology

The structural design of the existing fume hood will cause gas boundary layer separation near the entrance of the fume hood and behind the sliding door, resulting in eddy currents and backflow phenomena, resulting in the retention of gas pollutants in the cabinet, which is not conducive to the discharge of gas pollutants; in addition, the existing The structure of the fume hood is designed as a passive confluence structure, that is, under the suction of the exhaust fan, the cabinet maintains a negative pressure state, so that an obvious pressure gradient is formed in the cabinet and the room. Under the action of the pressure gradient, the air flows continuously from Indoor into the cabinet, and then carry the gas pollutants in the cabinet to the outside

The structure of passive confluence makes the anti-interference ability of the fume hood poor when converging the airflow at the operating port, and is easily affected by factors such as the movement of laboratory staff and the air supply of the air conditioner, which reduces the overall sewage discharge effect of the fume hood. In order to ensure that the fume hood The discharge efficiency of internal pollutants usually requires a large exhaust air volume, resulting in large energy consumption

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