The purification workbench is a general-purpose partial purification device. It can effectively eliminate the harmful effects of suspended matter and process dust in the air in the working area, and provide safety protection for operators, samples and samples between cross-infection and environment. With the development of science and technology, the purification workbench also Widely used in medical, pharmaceutical, chemical experiments, electronics, precision instruments, food and cosmetics, and its application is more and more extensive, a variety of different models, quality, appearance of the purification workbench has also come out. This article will specifically introduce the main working principle of a purification workbench, the working principle of each component and the details of the MCS51 single-chip purification workbench controller.
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*Chapter overview
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1.1 Type and structure of the purification workbench
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The commonly used purification workbench is divided into three types: vertical flow purification workbench, horizontal flow purification workbench and biological purification workbench. The purification workbench is divided into a single work table and a double work table from the number of operators, and is structurally divided into a conventional type and a new push-pull type and a self-circulating type. The vertical flow purification workbench is a local air purification device that provides a sterile clean working environment. It is widely used in medical and health, biopharmaceuticals. Food, medical science experiments, optics, electronics, sterile room experiments, sterile microbiological tests, cell culture, plant tissue culture, etc., research and production departments that require a local clean sterile work environment. The frame is made of cold-rolled steel plate, and the upper air supply and the lower work surface can be separated for easy movement. The diffuser plate of the air outlet of the workbench is equipped with an illumination fluorescent lamp and an ultraviolet germicidal lamp. The purification work area operation panel is made of transparent plexiglass. The horizontal flow purification workbench is a horizontal one-way flow type local air purification device, and the box body is made of thin steel plate, and an adjustable air volume fan system is adopted. Keep the wind speed in the work area within the required range. It is a versatile purification workbench that is widely used in a variety of applications where local purification is required.
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1.2 Principle
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The working principle of the purification workbench is that the three-phase motor is used as the blast power, and the power is about 145-260W. The air is blown out through the "super filter" composed of special microporous foam sheets, and is continuously formed. The dust-free and sterile ultra-clean air laminar flow, the so-called "efficient special air", removes dust, fungi and bacterial spores larger than 0.3 μm. The flow rate of the purified air is 24 to 30 m/min, which is enough to prevent the pollution caused by the nearby air, and the flow rate does not hinder the burning and disinfection of the device by the alcohol lamp or the Bunsen burner.
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Chapter 2 Hardware
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2.1 Basic components and functions of the purification workbench
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Composition
A purification workbench basically consists of the following parts: 1. Inlet wind non-woven fabric 2. High efficiency filter 3. Variable air volume inlet fan group 4. Fluorescent lamp 5. UV lamp 6. Front baffle 7. Operation panel 8 Operating hole 9. Universal casters (see Figure 1 and Figure 2 for details)
2. Function
1. The main function of the air inlet non-woven fabric is to first perform a coarse filtration on the externally entering air.
2. The function of the high-efficiency filter is to further filter the coarsely filtered air to meet the standard requirements. The cleanliness is generally required to reach level 100 (US Federal Standard 209B).
3. Variable air volume inlet fan group as the name suggests is to control the amount of wind, slow and fast.
4. Fluorescent lamps are used for lighting in the work area
5. UV lamp is used for sterilization of air.
6. The front baffle can make the operator see his own operation to facilitate the operation without polluting the air in the operating area, so use plexiglass.
7. The operation panel controls and adjusts the inlet fan group, fluorescent lamp and ultraviolet lamp to facilitate the operator's operation.
8. The operating hole is for the operator to reach into the operation.
9. Universal casters make the cleaning table more mobile.
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