Indoor ventilation device

Abstract

The invention belongs to the field of chemical laboratory ventilation, and specifically relates to a ventilation device which comprises a first ventilation pipe, a second ventilation pipe and a thirdventilation pipe which are connected end to end. The left end of the first ventilation pipe is provided with an air inlet, a filter screen is disposed at the position of the air inlet, a metal bellowsis disposed at the middle of the first ventilation pipe, a coil spring matched with a pipe body of the second ventilation pipe is wound around the surface of the second ventilation pipe, and the inner wall of the bottom of the third ventilation pipe is provided with a protrusion protruding into the pipe. The ventilation device has the advantages that dual purification is performed on laboratory air through the filter screen and a filter element, and by arrangement of the protrusion, dust can be prevented from flowing back.

Description

technical field [0001] The application belongs to the field of chemical laboratory ventilation, in particular to a ventilation device. Background technique [0002] The chemical laboratory is an important place to provide chemical experiments and research. There are a large number of toxic chemical reagents such as ether, acetone, cyclohexanone, etc. in the laboratory, which are often spilled during chemical experiments. Moreover, many chemical substances are volatile. Therefore, in order to prevent harmful gases from remaining in the laboratory for a long time, the laboratory is usually equipped with ventilation equipment, but the existing ventilation equipment is not effective in removing the residual chemical substances in the laboratory air. Contents of the invention [0003] In order to solve the above technical problems, the application provides a ventilation device, which is achieved by the following scheme: [0004] An indoor ventilation device, comprising a first...

AI Technical Summary

Problems solved by technology

[0002] The chemical laboratory is an important place to provide chemical experiments and research. There are a lot of toxic chemical reagents such as ether, acetone, cyclohexanone, etc. in the laboratory, which are often spilled during chemical experiments. Moreover, many chemical substances are volatile. Therefore, in order to prevent harmful gases from remaining in the laboratory for a long time, the laboratory is usually equipped with ventilation equipment, but the existing ventilation equipment is not effective in removing the residual chemical substances in the laboratory air

Images