VAV control system

Abstract

The invention discloses a variable-air-volume control system. The variable-air-volume control system comprises a box body, an air filling fan, an air exhausting fan, an electric control box, an air speed sensor and an air speed induction instrument and frequency converters, wherein the box body is arranged on the horizontal plane; the box body comprises a workbench and front vertical pillars; a push-pull door is arranged on one side of the box body and is connected with the box body in a sliding manner; an air outlet connected with the air exhausting fan is formed in the upper end of the box body; an air filling tube connected with the air filling fan is arranged; the front vertical pillars are arranged on two sides of the push-pull door; the front vertical pillars are provided with first air filling holes connected with the air filling tube; the air speed induction instrument is arranged at the middle and is arranged at the lower end of the air outlet; a signal wire of the air speed induction instrument is connected with the electric control box; two frequency converters are arranged; one frequency converter is connected with the air exhausting fan; the other frequency converter is connected with the air filling fan. The variable-air-volume control system can automatically adjust the air filling volume according to the air exhausting volume; the indoor air is not excessively exhausted; the constant room temperature can be maintained; the variable-air-volume control system is safe, reliable, energy-saving and environmentally-friendly.

Description

technical field [0001] The invention belongs to the field of experimental equipment, in particular to a variable air volume control system. Background technique [0002] In the process of chemical and pharmaceutical experiments, it is necessary to remove all kinds of polluting gases and odors released during the experiment in time to protect the safety of the experimenters. Therefore, fume cabinets are often used, and the requirements are getting higher and higher. The fume cabinets have anti-corrosion and The high-temperature resistant type is designed for special experimental needs, but the fume cabinet will form a strong negative pressure in the closed space due to the exhaust air, which is not conducive to the discharge of polluted gases. If a semi-open space is used, the environment of the laboratory , the humidity and temperature will not be satisfied, and the working environment of the test personnel will be greatly affected, thereby affecting the work efficiency. To ...

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Problems solved by technology

[0002] In the process of chemical and pharmaceutical experiments, it is necessary to remove all kinds of polluting gases and odors released during the experiment in time to protect the safety of the experimenters. Therefore, fume cabinets are often used, and the requirements are getting higher and higher. The fume cabinets have anti-corrosion and The high-temperature resistant type is designed for special experimental needs, but the fume cabinet will form a strong negative pressure in the closed space due to the exhaust air, which is not conducive to the discharge of polluted gases. If a semi-open space is used, the environment of the laboratory , the humidity and temperature will not be satisfied, and the working environment of the test personnel will be greatly affected, thereby affecting the work efficiency. To solve the above problems, the fume hood can be used in conjunction with the air conditioning unit or an independent exhaust system. Take away a lot of warm air or cold air, wasting a lot of electricity, the independent exhaust system can make up the outdoor air to the operating surface of the ventilation cabinet, reducing the demand for air conditioning and reducing energy consumption. It can effectively solve the problem of negative pressure, but new problems have emerged. Because of different experiments, the emission of pollutant gases is different, and the opening height of the window is different, and the amount of indoor supplementary air is also different. Therefore, the exhaust air of the ventilation cabinet during use The volume requirement is dynamically changing, especially the supplementary air volume should be effectively controlled in the state of 60% to 85% of the exhaust air volume, because the operation control of the fume cabinet must maintain a negative pressure state to prevent the discharge of polluted gases, so it is necessary Provide an energy-saving, safe and applicable fume hood that can automatically adjust the supplementary air volume, which can monitor the exhaust air volume change signal, then feed the signal back to the supplementary air volume system, and adjust the supplementary air volume in time according to the exhaust air volume

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