Control system and control method of surface air speed of fume hood

A technology of wind speed control and fume hood, which is applied to cleaning methods and appliances, chemical instruments and methods, and dust removal, etc. It can solve the problem that the wind speed of the fume hood cannot be opened and the size can be effectively adjusted, so as to reduce energy consumption and reduce wind noise , Improve the effect of the experimental environment
CN102716889AInactive Publication Date: 2012-10-10BEIJING XINGAO LAB EQUIP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING XINGAO LAB EQUIP
Publication Date
2012-10-10
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a control system for surface air speed of a fume hood. The control system comprises a displacement sensor, a PID (proportion, integration and differentiation) controller, an air valve driver, a speed reducer, a butterfly valve, a micro-control unit, an input keyboard, a display device and a warning device, electric signals inputted by the displacement sensor are compared with preset surface air speed parameters corresponding to the opening height of a surface window, required air exhaust speed data for maintaining the negative pressure in the fume hood are generated, transmitted to the micro-control unit and converted into control signals, the control signals are transmitted to a control signal input end of the air valve driver via a signal output end, and the air valve driver drives the butterfly valve via the speed reducer to regulate the exhaust air rate in an exhaust pipeline. By the aid of the control system, the opening size of the surface window and the surface air inlet speed are regulated in a linkage manner. The invention further discloses a control method implemented by the aid of the control system.
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Description

technical field

[0001] The invention relates to an electromechanical system and a control method, in particular to an electromechanical system and a control method for wind speed control. 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 experimenters and prevent the pollutants in the experiment from spreading into the laboratory, the experimental process usually takes Complete in a fume hood. The fume hood includes a cabinet body, a window on the cabinet surface and a ventilation duct connected to it. The ventilation duct is connected to the exhaust system. The exhaust system exhausts the air to the outside to form a negative pressure in the cabinet, so that the harmful gas in the cabinet will flow along the ventilation duct. Exhaust, that is, it is necessary to maintain a certain fresh air suction speed at the opening of the window on the cab...

Claims

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