Variable air volume adjusting method and device for exhaust hood of laboratory

Abstract

The invention discloses a variable air volume adjusting method and device for an exhaust hood of a laboratory. The adjusting method comprises the following steps: S1, an air volume Q1, which needs tobe exhausted from a ventilation pipe in the process in which a fully closed window of the exhaust hood is fully opened, is calculated, and a target air volume curve is drawn; S2, an exhaust valve is selected according to the target air volume curve and an effective stroke range of a valve element assembly of the exhaust valve when the exhaust valve is arranged; S3, an effective stroke L1 in the process in which the fully closed window of the exhaust hood is fully opened, an effective stroke L2 of the valve element assembly in the process in which the fully closed exhaust valve is fully opened,and a register ratio N are calculated; S4, the window of the exhaust hood moves to drive a linkage mechanism to move; and S5, the linkage mechanism drives the valve element assembly of the exhaust valve to move, so that a ventilation section area is changed, and an actual air volume is further changed. The method and device disclosed by the invention has the advantages that a mechanical linkage structure is adopted for adjustment, so that the transmission precision is high, and swiftness and high convenience are achieved.

Description

technical field [0001] The invention relates to the field of fume cupboards, in particular to a variable air volume regulating method and regulating device of a laboratory fume cupboard. Background technique [0002] The fume hood is a laboratory equipment for collecting and draining harmful fumes such as corrosive chemical gases and toxic fumes during physical, chemical, biological and other experimental processes, so as to protect personal and equipment safety. The standard for the wind speed on the surface of the fume hood in general laboratories requires that the wind speed on the surface of the fume hood should be constant at 0.4-0.5m / s. When the size of the operation window of the fume hood changes, it is necessary to adjust the opening of the exhaust valve The size to meet the wind speed requirements of the fume hood. [0003] The traditional adjustment method is: through the displacement sensor to measure the opening height of the fume hood window and the window wid...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for adjusting the variable air volume of the laboratory fume hood, and an adjustment device to solve the problem in the prior art that the air volume adjustment system of the fume hood has a complex structure, and the traditional adjustment method has a certain delay. problem; at the same time, it solves the problem of low adjustment accuracy of the variable air volume in the fume hood

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