The filter characteristics indicators have four, namely, speed, filter speed, efficiency, resistance, and dust. Of course, there are other indicators, such as weight, power and regeneration characteristics, etc. These indicators are mainly related to filter materials, so what filter material manufacturing filter is the most important part of the development of filters. In addition to the determinants of filter materials, the structure of the filter is also an important factor. For example, a filter material makes a flat filter or a multi-bag shape or wedge filter, which is very different in resistance and dust removal, so it is a reasonable and optimal structure, and it is another important part of the development of the filter. . Resistance: The fibers turn the airflow to the airflow to produce minute resistance. The sum of the resistance of countless fibers is the resistance of the air filter. The air filter resistance increases with gas flow, by increasing the air filter material area, the relative wind speed of the filter material can be reduced to reduce the air filter resistance. Space and filter speed measuring filter
1. The basic knowledge of the filter is the main purification device of the clean room, which is the main means of air purification. Therefore, it is very important for the basic knowledge of clean room design, construction, and maintenance management to understand and master the filter. A. The classification of the filter is divided according to the performance of the filter (efficiency, resistance, dust removal), usually divides it into a coarse, alive, high-efficient, sub-efficient, efficient (HEPA) and ultra efficient (ULPA) Six types of filters.
High efficiency filter: Mainly used to capture particulate dust and various suspensions of 0.5 μm or less. Using ultrafine glass fiber paper, rubberized paper, aluminum film and other materials are used as a split plate, and is glued to the outer frame of the aluminum alloy. Each unit is tested by the gas method, with high filtering efficiency, low resistance, and high dust removal. High efficiency air filters can be widely used in optical electronics, LCD liquid crystal manufacturing, biomedicine, precision instruments, medical institutions, air-conditioning ends of dust-free water purification workshops, etc.. Efficient and super efficient filters are used in the end of the clean room, which can be divided into the form of a structure: there is a separator, high-efficient, high-wind, high-efficiency filter, etc. In response to the selection of the initial, medium-end, efficient air filter, should also be made with reference to these four performance parameters. 1 Select a filter with a large filter area. The larger the filter area, the lower the filter speed,
General ventilation filter test method ◇ Countertorthry Arrestance test dust source is a large particle size, high concentration of standard dust. The main ingredient of dust is screening, the floating dust in the region, and then incorporates the specified amount of fine carbon black and short fibers. Most countries regulate the use of \"Road Dust \" (ARIZONA Roaddust) in Arizona, USA, and China standards have stipulated that the dust of a village in the Loess Plateau is used in Japan's \"Guan Dong Ascerta.\". The measured \"amount \" is the weight of the dust. The filter is mounted in a standard test wind hole, and the upper wind is continuously dust. Every time, the dust collecting dust on the dust or filter of the filter is measured, thereby obtaining the filtering efficiency calculated by the filter at this stage according to the weight of the dust. The final weight efficiency is the weighted average of the efficiency and dust content in each test stage. The conditions for the termination test of the courage method are: the final resistance value of the convention, or
The bag-type medium-effect filter is mainly used in central air conditioning and centralized air-blowing systems, which can be used for intermediate filtration of air conditioning systems to protect the next level of the filter and system itself in the system, where the air purification is not strict, The air after treatment of the fluid filter can be sent directly to the user. The bag-type medium-effect filter has been widely used in central air-conditioning ventilation systems, pharmaceuticals, hospitals, electronics, food and other industrial purification, can also be filtered as front ends of the high-efficiency air filter to reduce the load of high efficiency air filters, extending its Life. Because the bag filter is large, it is large, the wind speed is low, and it is considered to be the current genital filter structure. Bag mid-range filter, border with aluminum alloy, galvanized plate, etc., filter materials have nonwoven fabric, glass fibers, and the like. The bag-type medium is made of its unique bag structure to ensure that the airflow is equilibly full of bags. Unique hot melt technology can prevent