In the fields of biomedicine, drug development, and semiconductor manufacturing, ultra-clean benches have been commonly used as the basic configuration of laboratories to ensure reliable experimental results. The design concept of the ultra-clean bench is to maintain the experimental operation area in a clean room environment where the standard airflow flows through. In this environment, the indoor microbial contamination has been completely controlled in a controllable area, further preventing toxic substances from remaining in the design space, thus ensuring the safety of experimental applications. The design of the clean bench is based on a microbiology that reveals that the control of airflow can effectively prevent the distribution of bacteria. This article from the composition of the ultra-clean workbench structure, filtering mechanism, standard airflow and other aspects of your detailed analysis of the principle of ultra-clean workbench.
1. the composition of the clean bench structure
clean bench by the filter, exhaust system, dust collector, outdoor edge components and other four main components. All components shall be manufactured and installed in strict accordance with the requirements of the clean room.
1. Filter
filter is the core department of the clean bench. It can control the amount of dust falling in the experimental area and the number of microorganisms in the experimental area. Filters are usually divided into three levels: primary filter, intermediate filter and high efficiency filter. The
primary filter is used to filter particles with a diameter of 5.0~10.0 μm in the indoor source gas, the intermediate filter is used to filter particles with a diameter of 1.0~5.0 μm in the indoor source gas, and the high efficiency filter can filter particles with a diameter of more than 0.3 μm. The ultra-clean bench usually uses the high-efficiency filter (H.E.P.A.) of the British Camfil company to ensure that the filtration rate of natural pollution is as high as 99.99%, and the filtration effect of 0.3 micron particles reaches 99.995% under the optimal configuration.
2. Exhaust system
drainage system consists of negative pressure pipe, fan and exhaust pipe. For the ultra-clean bench, it must make the chemical gas emitted by the laboratory excrete most of the outside, in order to maintain the experimental area of gas flow and pressure equal state. For clean benches, the requirements for airflow are relatively low in clean rooms, because there is a huge difference between standard airflow and biological airflow, so an independent exhaust system is very important in clean benches.
3. Dust collector
The clean bench also needs to be equipped with a dust collector to collect the tiny particles generated during the experiment. A high load of wash water represents a highly effective particulate matter collection strategy. Any impurities and impurities can be gradually precipitated from the washing liquid, and then recovered and treated with a pump. This step is intended to ensure that the number of particles collected is within the quality requirements of the clean bench operating area.
4. Outdoor Edge Components
some peripheral components such as doors, locks, rehabilitation systems and switches, which become contacts for the internal environment of the ultra-clean console. All of these components must be manufactured and designed in strict accordance with the clean room environment to ensure efficient and safe operation of oxygen cleaning.
2. the filtration mechanism of the clean bench
Through the filtration mechanism, the clean bench can control the amount of dust falling in the experimental area and the number of microorganisms in the experimental area. The filtration mechanism of the clean bench mainly includes three steps: pre-filtration, main filtration and high-efficiency filtration.
1. Pre-filtration
In the filtration mechanism of the clean bench, pre-filtration is equivalent to adding an intermediate stage to the filtration mechanism. As the first line of defense, it is responsible for filtering large particles and dust and other impurities in the air, thereby protecting the filtering effect of the main filter, maintaining the durability of the filter and reducing the number of cleaning cases, while also improving the efficiency of the filtered air.
2. Main filter
The main filter is actually an intermediate filter that filters large particles to achieve a certain degree of cleanliness.
3. High-efficiency filtration
High-efficiency filtration is to clean small particles above 0.3 microns to avoid their dispersion in the air, thereby ensuring the cleanliness of the indoor environment.
3. the standard airflow
the standard airflow is very important in the clean bench. By controlling the airflow process and supplementary airflow, the standard airflow can be achieved. These standard airflows can control the flow pattern and speed between the ceiling and floor of the operating area, thus maintaining a dynamic balance of airflow and ensuring a constant indoor air quality. The standard airflow has a "general downward" movement trend. In systems with large laboratory operating areas, the choice of air delivery and convection is very important.
4. to realize the operation method of clean bench
1. Prepare the filter
Before opening the clean bench, you must check whether the filter is clean, complete and meets the operation requirements.
2. Prepare to operate
Before entering the laboratory, the
must take off the watch, bracelet, mobile phone and other items, wear overalls, gloves, masks and goggles, and carry out anti-acid and anti-virus treatment.
3. Open the clean bench
to ensure that the filter meets the requirements, can open the clean bench, the process must maintain cleanliness and standardize the instrument. During the operation, strict procedures and protocols must be followed, and the cleanliness of the experimental area must be maintained, and thorough cleaning must be carried out after the experiment is used to maintain anti-pollution and disinfection.
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