The classification and function of filters

air filter

The prototype of    air filter is a respiratory protection device used by people to protect the breath. According to records, as early as the first century in Rome, people used hemp masks for protection when they purified mercury. In the long time since then, air filters have also made progress, but they are mainly used as respiratory protection devices in some dangerous industries, such as the production of hazardous chemicals. In 1827, Brown discovered the law of motion of tiny particles, and people have a better understanding of the mechanism of air filtration.

   The rapid development of air filters is closely related to the development of the military industry and the electronics industry. During the First World War, due to the use of various chemical poisons, military gas masks with asbestos fiber filter paper as the smoke filter layer came into being. Glass fiber filter media for air filtration was patented in the United States in October 1940. In the 1950s, the United States conducted in-depth research on the production technology of glass fiber filter paper, which improved and developed air filters. In the 1960s, HEPA filters came out; in the 1970s, HEPA filters using fine glass fiber filter paper as the filter medium have a filtration efficiency of 99.9998% for particles with a particle size of 013 microns. Since the 1980s, with the emergence of new test methods, the improvement of use evaluation and the improvement of filtration performance requirements, it has been found that HEPA filters have serious problems, so higher performance ULPA filters have been produced. Countries are still studying hard, and it is estimated that more advanced air filters will appear soon.

   Air filter performance

   Make the polluted air clean to the state needed for production and life, that is, make the air reach a certain degree of cleanliness. How the air filter filters the air:

  General air purification equipment filtering air is roughly divided into the following methods and steps.

  1. Multiple filters-prevent dust and germs in the air from entering the room

  Multiple activated carbon filters effectively intercept dust and germs, filter the air, and ensure that the air entering the room is clean.

  2. Titanium oxide kills poison-degrades the pollution of organic toxic gases such as formaldehyde and benzene in the indoor air

  Nano-grade titanium dioxide is activated by ultraviolet light to filter the air and effectively degrade the radioactive pollution of organic toxic gases such as formaldehyde and benzene in the air.

  3, negative ion oxygenation-increase the oxygen in the indoor air to an appropriate amount and keep the content stable

   Negative ion generator oxygenates the indoor air to ensure that the air entering the home maintains sufficient oxygen and is full of vitality, and strengthens the filtration of the air

  4, PTC ceramic heating-heating indoor air to a comfortable temperature

  PTC ceramic heating plate assists in preheating the fresh air entering the room in winter, appropriately increasing the indoor temperature, thereby filtering the air, and making the home warm and comfortable.

  5. Ultraviolet light sterilization-powerfully kill epidemic viruses and bacteria in the air   Ultraviolet light source can effectively kill the epidemic virus and bacteria in the air, keep people away from the source of infection, filter the air, and protect the health of the whole family.

The filter is an indispensable device on the pipeline of the conveying medium. It is usually installed at the inlet end of a pressure reducing valve, a pressure relief valve, a fixed water level valve or other equipment to eliminate impurities in the medium to protect the valve and equipment. use. When the fluid enters the filter cartridge with a certain specification filter screen, its impurities are blocked, and the clean filtrate is discharged from the filter outlet. When cleaning is needed, just take out the detachable filter cartridge and reload it after treatment. Yes, therefore, it is extremely convenient to use and maintain.

   high efficiency air filter

   High efficiency air filter is generally used as the end of the filter, so the requirements for the high efficiency filter are also the most stringent, and the factory needs to be tested one by one. As the end of the high-efficiency filter, it is the most critical one of the various levels of filters and requires additional "watching". To extend the service life of the high efficiency filter, the most fundamental way is to block the dust in the pre-filter. The replacement of the pre-filter generally does not require suspension of production or debugging, so experienced owners will pay attention and money to the pre-filter. For class 10,000 and class 100,000 clean workshops. The F8 filter can be used for pre-filtration, so that the service life of the end high efficiency filter is generally up to five years. In foreign projects and domestic new projects, F8 filter is the most common pre-filter for non-uniform flow clean room. For the chip factory's level 100, level 10 or higher clean workshop, the common efficiency level of the pre-filter is H10, and many new projects simply choose HEPA. In the past domestic clean room air conditioning system design, the common configuration of filters is: coarse efficiency, medium efficiency and high efficiency. At that time, the service life of the high efficiency filter was only 1-3 years, and the worst was only a few months. It can be seen that the efficiency of the pre-filter determines the service life of the end filter.

   liquid filter

   Make the contaminated liquid clean to the state required for production and life, that is, make the liquid reach a certain degree of cleanliness.

   The main common liquid filters are: swimming pool integrated filtering equipment.

   Pool integrated equipment is a mainstream product choice in the modern swimming pool industry market. With its technical content and design concept, integrated swimming pool equipment has brainstormed a new impact on the swimming pool equipment market. Integrated swimming pool equipment is a swimming pool equipment that integrates swimming pool filtration, disinfection and circulation, and has become a mainstream product in today's swimming pool equipment market.

  The integrated swimming pool equipment plays an irreplaceable role in the operation of modern swimming pools. Its characteristic function has the following three points:

   1. Its location can be placed near the swimming pool with low noise and high safety factor.

   Second, the installation is simple, the workload is reduced, and the efficiency is high.

  3. Small size and buried underground, which can free up space to beautify the swimming pool.

   network filter

   Through settings to block spam, make sure that the information on the computer screen meets the requirements as much as possible.

   light filter

   The principle of same absorption separates light of different colors and absorbs some unwanted light.