Variable air volume ventilation cabinet

Abstract

The invention discloses a variable air volume ventilation cabinet. The variable air volume ventilation cabinet comprises a ventilation cabinet body, wherein an air exhaust device is arranged at the top of the ventilation cabinet body; the air exhaust device comprises a fan, an air collecting hood, a frequency converter, a temperature sensor and a PID regulator; the air collecting hood is arrangedon the inner side of the top of the ventilation cabinet body; the fan is connected with the air collecting hood through a connecting pipe; the fan is connected with an air exhaust pipe; the temperature sensor is arranged inside the ventilation cabinet body; the temperature sensor is connected with the PID regulator; the PID regulator is connected with the frequency converter; the frequency converter is connected with the fan; an air supply opening is formed in the ventilation cabinet body; the air supply opening is connected with an air supply device; the air supply device comprises an air supply fan, an air supply pipe and a fan switch; the air supply fan is connected with the air supply pipe; the ventilation cabinet body is provided with a cabinet door and a cabinet door frame which canbe lifted; the opening and closing of the cabinet door are controlled by a control device; the air supply fan switch is arranged at the bottom of the cabinet door frame; a distance sensor is arrangedon the ventilation cabinet body; the distance sensor is connected with the control device; and the fan switch and a main switch are arranged on the ventilation cabinet body.

Description

Technical field [0001] The invention relates to the technical field of laboratory equipment, in particular to a variable air volume fume hood. Background technique [0002] When conducting chemical or laboratory experiments in the laboratory, it often involves the tests of harmful gases, odors, moisture, and flammable, explosive, and corrosive substances, in order to protect the experimental operators and the entire laboratory staff. It is safe to prevent the pollutants generated during the experiment from spreading into the laboratory. The experimental process of this kind of experiment is usually completed in a fume hood. Therefore, it is very important to thoroughly ventilate the fume hood. The ventilation device uses a constant wind speed and a fixed-size air duct for exhaust, and its air volume will not change. When the temperature in the fume hood is low, the ventilation device using this power to exhaust air will easily cause waste of resources. When the temperature insid...

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Problems solved by technology

[0002] When carrying out chemical or laboratory experiments in the laboratory, harmful gases, odors, moisture, and flammable, explosive, and corrosive substances are often involved in the experiments. In order to protect the safety of the experimental operators and the entire laboratory staff It is safe to prevent the pollutants produced during the experiment from spreading into the laboratory. The experimental process of this kind of experiment is usually completed in the fume hood, so it is very important to carry out thorough ventilation in the fume hood. The existing fume hood The ventilation device uses a constant wind speed and a fixed-sized air duct to exhaust the air, and the air volume will not change. When the temperature inside the fume hood is low, the ventilation device uses this power for exhausting, which will easily cause waste of resources. When the temperature inside the fume hood is high, the ventilation device may cause incomplete exhaust and insufficient exhaust force when the ventilation device uses constant power for exhaust operation. When some chemical substances are heated or organic chemical reaction experiments are performed, the exhaust in the cabinet The temperature is relatively high, if measures are not taken in time at this time, it is easy to cause accidents

[0003] At present, the ventilation device in the fume hood on the market uses a constant wind speed and a fixed-sized air duct to exhaust the air, and the size of the air volume will not change. When the temperature inside the fume hood is low, the ventilation device uses this power to carry out Exhaust air is easy to cause waste of resources. When the temperature inside the fume hood is high, the ventilation device may cause incomplete exhaust and insufficient exhaust air when the ventilation device uses a constant power for exhaust operation.

[0004] However, in the prior art, since the ventilation device in the fume hood adopts a constant wind speed and a fixed-sized air duct for exhaust, it is easy to cause waste of resources or insufficient exhaust.

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