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The clean bench is designed to meet the cleanliness requirements of local work areas in the fields of modern industry, optoelectronics industry, biopharmaceuticals, scientific research and experiments. Its working principle is: the air is sucked through the fan, filtered through the static pressure box through the high-efficiency filter, and the filtered clean air is sent out in the state of vertical or horizontal air flow, so that the operation area continues to reach 100 grade cleanliness under the control of clean air Degree to ensure that the production requires environmental cleanliness.
Classification of ultra-clean workbench:
The ultra-clean workbench is divided into a vertical flow clean bench (horizontal flow clean bench) and a horizontal flow clean bench (horizontal flow clean bench) according to the direction of air flow. Vertical blowing is mostly used in medical engineering to ensure people's health; horizontal flow table noise is relatively small and the wind is outward, so it is used in the electronics industry and has little effect on physical health. According to the operation structure, it is divided into unilateral operation and bilateral operation. According to its use, it can be divided into ordinary ultra-clean workbench and biological (medicine) ultra-clean workbench.
From the number of operators, it is divided into single super clean table and double super clean table; from the structure, it is divided into two types of lower suction air and upper suction air; from the air supply, it is divided into horizontal air supply and vertical air supply.
Ultra clean table use
This is a general-purpose local purification equipment. The form of air flow is vertical laminar flow. It can create a local high-clean air environment. It is the most ideal special equipment for scientific research, pharmaceutical, medical and health, electronic optical instruments and other industries.
Working principle of ultra-clean workbench
The basic principles are roughly the same. The indoor air is pre-filtered by a coarse filter, pressed into a static pressure box by a centrifugal fan, and then fine-filtered by a high-efficiency air filter.The clean air flow sent out passes a certain uniform cross-section wind speed without The bacteria area, thus forming a dust-free and sterile high-cleanness working environment. However, the airflow direction of the two purification tables is different, and the airflow after the air purification of the side-flow worktable flows from the left or right side to the opposite side through the worktable surface, and also from From top to bottom or from the upper side of the countryside to the opposite side, a gas flow barrier can be formed to keep the work area sterile. However, at the junction of the purified gas flow and the outside gas, a negative pressure may occur due to the flow of the gas flow, causing a little unpurified air to mix in. Possibility of pollution. The structure of the flow measurement purification station is relatively closed, and generally only a circular hole into which two arms extend is left. It is not convenient to operate and take large items.
The outflow type (horizontal type) is to make the purified air flow toward the operator, so the external airflow will not be mixed into the operation area, but it is unfavorable to the operator if the hazardous substance experiment operation is performed. There is no protective baffle, although it is more convenient to operate and take items, but it may be affected by the external airflow and cause the air not to be mixed.
The purification workbench is a more sophisticated instrument. If used and maintained properly, it can achieve good results and extend the service life.
The ultra-clean workbench mainly uses high-efficiency filters to purify the air. Its high-efficiency filters use a certain service life and need to be replaced regularly. If the workbench itself is in a cleaner environment, such as in a GMP workshop, the frequency of replacement is lower; if it is just a normal laboratory, the high-efficiency filter should be replaced every 2 years to ensure its effect.
The service life of the ultra-clean table is related to the cleanliness of the air. In the temperate zone, the ultra-clean bench can be used in general laboratories. However, in tropical or sub-tropical areas, where the atmosphere contains a lot of pollen or dusty areas, the ultra-clean bench should be placed in a better indoor with double doors. . Under no circumstances should the air inlet hood of the ultra-clean platform be placed against an open door or window, so as not to affect the service life of the filter.
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