Control system utilizing photocatalyst to sterilize biosafety cabinet

Abstract

The invention relates to a control system utilizing photocatalyst to sterilize a biosafety cabinet, and belongs to the technical field of experimental equipment. The biosafety cabinet comprises a shell, wherein the shell is internally provided with an operation chamber, a decontamination chamber and an air circulation system, and an air inlet of the decontamination chamber is successively provided with a first ultraviolet lamp, a first photocatalyst layer, a second ultraviolet lamp and a second photocatalyst layer; the air inlet for delivering air from the decontamination chamber to the operation chamber is successively provided with a main filter and an ozone decomposer, wherein the operation chamber is provided with an ozone sensor; the control system comprises an amplifier, a threshold comparator, a processor, a warner and a display, and a current voltage converter is used for changing a current signal output by the ozone sensor into a voltage signal; and the threshold comparator is used for comparing the voltage signal with the threshold, when the input voltage signal is greater than or equal to the threshold value, and the processor sends a signal to the warner and the display. The control system provided by the invention is capable of judging the operation state of the ozone decomposer.

Description

technical field [0001] The invention relates to a control system of a photocatalyst sterilized biological safety cabinet, in particular to a control system of a biological safety cabinet capable of purifying air, and belongs to the technical field of experimental equipment. Background technique [0002] figure 1 It is a schematic side view of a biological safety cabinet in the prior art. Such as figure 1 As shown, the biological safety cabinet includes a housing 1 arranged on a support 30 , and casters 31 are provided at the lower ends of the four legs of the support 30 . Housing 1 comprises front cover plate 25 (telescopic glass door), front cover plate 26, left wall, right wall, top wall and bottom wall, is provided with a diffuser plate 27 in the middle part of housing 1, front cover plate 26, left The upper part of the wall, the upper part of the right wall, the top wall and the air diffuser form an upper space, and the front sealing plate 25, the lower part of the le...

AI Technical Summary

Problems solved by technology

In order to sterilize, a UV (ultraviolet) lamp 32 is installed in the working room, that is, to irradiate with a UV (ultraviolet) lamp to kill organic compounds or fungi in the air, but the sterilization is not thorough. Oxygen in the air becomes ozone. When the concentration of ozone in the air exceeds the standard, ozone is an invisible killer. It strongly stimulates the human respiratory tract, causing sore throat, chest tightness, cough, bronchitis and emphysema; it causes human neurotoxicity, Dizziness, headache, vision loss, memory loss; damage to the vitamin E in human skin, causing skin wrinkling and dark spots; it can also damage the immune function of the human body, induce lymphocyte chromosomal changes, accelerate aging, and cause Pregnant women give birth to deformed children, so the ozone discharged from the biological safety cabinet will cause secondary pollution to the air, and at the same time, ozone will cause strong oxidation of some experimental materials

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