The prototype of the air filter is a respiratory protection device that people use to protect their breath. According to records, as early as the first century in Rome, people used masks made of hemp for protection when purifying mercury. In the long time after this, Y-type 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 movement 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, in-depth research was conducted on the production process of glass fiber filter paper, which improved and developed the air filter. In the 1960s, the HEPA filter came out; in the 1970s, the HEPA filter using fine glass fiber filter paper as the filter medium has a filtration efficiency of 99.9998% for particles of 013 micron size. Since the 1980s, with the emergence of new test methods, the polluted air has been cleaned to the state required for production and life, that is, the air has reached a certain degree of cleanliness.
How air filters filter air:
General air purification equipment to filter air is roughly divided into the following methods and steps.
- Multiple——prevent dust and germs in the air from entering the room
Multiple activated carbon filters effectively intercept dust germs and filter the air to ensure that the air entering the room is clean.
- Titanium dioxide anti-virus——degradation of formaldehyde, benzene and other organic poisonous gases in indoor air
Nano-scale titanium dioxide is activated by ultraviolet light to filter air and effectively degrade the radioactive pollution of formaldehyde, benzene and other organic poisonous gases in the air.
- Negative ion oxygenation——increase the oxygen in the indoor air to a proper amount and keep the content stable
- PTC ceramic heating——heating indoor air to a comfortable temperature
PTC ceramic heating plate assists the preheating of the fresh air entering the room in winter, appropriately increases the indoor temperature, thereby filtering the air and making the home warm and comfortable.
- Ultraviolet light sterilization——strongly kill epidemic virus bacteria in the air
Ultraviolet light source has a strong effect to kill epidemic virus 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 transmission medium pipeline. It is usually installed at the inlet end of the pressure reducing valve, pressure relief valve, fixed water level valve or other equipment. It is used to eliminate impurities in the medium to protect the valve and equipment. use. When the fluid enters the filter cartridge with a certain filter screen, its impurities are blocked, and the clean filtrate is discharged from the filter outlet. When cleaning is required, as long as the detachable filter cartridge is taken out, it is reloaded after treatment. Yes, therefore, it is extremely convenient to use and maintain.