Fume hood with automatically variable air quantity

Abstract

The invention discloses a fume hood with automatically variable air quantity. The fume hood with automatically variable air quantity comprises a body, a ventilating device, an alarm and a control unit, wherein the body is provided with an infrared sensor which is used for detecting whether experiment operators stay in a working region or not; a temperature sensor for detecting the temperature in the body is arranged on the inner side of the body; the ventilating device comprises three ventilating plants including a first ventilating plant, a second ventilating plant and a third ventilating plant; a first solenoid valve, a second solenoid valve and a third solenoid valve are respectively arranged on the first ventilating plant, the second ventilating plant and the third ventilating plant; the control unit is in communication connection with the infrared sensor, the temperature sensor and the alarm; after acquiring detecting signals through the infrared sensor and the temperature sensor, the control unit controls the first solenoid valve, the second solenoid valve, the third solenoid valve and the alarm to act by commands, and the ventilation quantity and the ventilation intensity in the fume hood are classified according to the temperature in the body so as to accurately control the temperature in the body.

Description

technical field [0001] The invention relates to the technical field of laboratory equipment, in particular to an automatic variable air volume fume hood. Background technique [0002] In some experiments involving harmful gases, odors, moisture, and flammable, explosive, and corrosive substances, in order to protect the safety of the experimental operators and prevent the pollutants in the experiment from spreading into the laboratory, the experimental process usually requires Complete in a fume hood. Therefore, it is particularly important to carry out thorough ventilation in the fume hood; the ventilation device in the existing fume hood adopts constant wind speed and intensity to exhaust the air. Waste of resources; when the temperature in the cabinet is high, the ventilation device uses the power of its own weight to exhaust air, which may cause problems such as incomplete exhaust and insufficient exhaust force. When some chemical substances are heated or organic chemi...

AI Technical Summary

Problems solved by technology

Therefore, it is particularly important to carry out thorough ventilation in the fume hood; the ventilation device in the existing fume hood adopts constant wind speed and intensity to exhaust the air. Waste of resources; when the temperature in the cabinet is high, the ventilation device uses the power of its own weight to exhaust air, which may cause problems such as incomplete exhaust and insufficient exhaust force.

When some chemical substances are heated or organic chemical reaction experiments are carried out, the temperature in the cabinet is relatively high. If measures are not taken in time at this time, it is easy to cause accidents; especially important

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