Classification，performance and Installation of Plastic Strainer

The filter is composed of simplified body, stainless steel filter screen, sewage discharge part, transmission device and electrical control part.

Media classification: Air filter: The prototype of the air filter is the respiratory protection device used by people to protect breathing. It is recorded that as early as in the first century in Rome, people used masks made of rough hemp to protect them when purifying mercury. For a long time after this, air filters have also made progress, but they were used mainly as respiratory protection devices in some dangerous industries, such as the production of hazardous chemicals. In 1827, Brown discovered the motion of tiny particles and gained a further 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, the use of asbestos fiber filter paper emerged due to the use of various chemical agents. Fiberglass filtration medium for air filtration was patented in the United States in October 1940. In the 1950s, the United States has deeply studied the production process of glass fiber filter paper, so that the air filter has been improved and developed. In the 1960s, HEPA filter was introduced, and in the 1970s, with HEPA filter with fine glass fiber filter paper as the filter medium, the particle filtration efficiency was 99.9998%. Since the 1980s, with the emergence of new test methods, the improvement of use evaluation and the improvement of filter performance requirements, HEPA filters have been found to have serious problems, resulting in a higher performance of ULPA filters. Countries are still working hard, and more advanced air filters are expected soon.

Air filter performance: to make the polluted air is clean to the state needed by production and life, that is, to make the air to a certain degree of cleanliness. How air filter filters air: General air purification equipment filtration of air is roughly divided into the following methods and steps:

Multiple filter screen ———— prevents airborne dust and germs from entering the room, Multiple active carbon filters effectively intercept dust bacteria, filter the air, to ensure that the air into the room is clean.

2、Titanium oxide antitoxic ———— degrades the formaldehyde, benzene and other organic gases in the indoor air pollution, Nanometer-scale titanium dioxide is activated by ultraviolet light to filter the air to effectively degrade formaldehyde, benzene and other organic gases in the air.

3、Negative ion oxygenation ———— increases the oxygen in the indoor air to an appropriate amount and keeps the content stable, The anion generator oxygenates the indoor air to ensure that the air entering the home maintains sufficient oxygen, full of vitality, and strengthens the air filtration.

4、PTC ceramic heating ———— heating indoor air to a comfortable temperature, PTC ceramic heating sheet assist preheating the fresh air entering the room in winter, and appropriately increase the indoor temperature, so as to filter the air and make the home warm and comfortable.

5、UV-light sterilization of ———— strongly kills endemic viral bacteria in the air, Ultraviolet light source has a strong effect to kill the epidemic viruses and bacteria in the air, to make people stay away from the source of infection, to filter the air, to care for the health of the whole family.

High efficiency air filter: high efficiency air filter is generally as the end of filtration, so the requirements for high efficiency filter are the most stringent and strict, factory need to be detected by one. Efficient filter as the end is the most critical level of all levels of filters, requiring additional "viewing". The most fundamental way to extend the life of efficient filters is to keep dust in the pre-filter. Replacement pre-filtering generally does not stop production, no debugging, so experienced owners will put attention and money on the pre-filter. For 10000 and 100000 clean plant. Pre-filter can be selected from the F8 filter, so that the service life of the end-efficient filter is generally up to five years. F8 filter is the most common pre-filter in foreign projects and new domestic projects. For clean chip plants of grade 100, grade 10 or higher, the common efficiency level of pre-filters is H10, and many new projects simply choose HEPA. In the past clean room air conditioning system design in China, the filter is commonly configured as: coarse efficiency and medium efficiency. At that time, the life life of efficient filters was only 1-3 years, and the worst was only a few months. Therefore, the efficiency of the prefilter determines the service life of the terminal filter.

Liquid filter: to make the contaminated liquid is clean to the state needed by production and life, that is, to make the liquid to a certain degree of cleanliness.Liquid filters are mainly common: swimming pool integrated filtration equipment.

Integrated swimming pool equipment in the modern swimming pool industry market belongs to a mainstream product selection direction. Swimming pool integrated equipment with its technical content, its design concept, brainstorming to the swimming pool equipment market to cause a new impact. Swimming Pool integrated equipment is a set of swimming pool filtration, disinfection, circulation as one of the swimming pool equipment, has become a mainstream product in today's swimming pool equipment market.

Pool integrated equipment plays an irreplaceable role in the operation of modern swimming pool. Its characteristics and functions have the following three points: First, its location can be placed near the swimming pool, with low noise and high safety factor. Second, simple installation, reduce the workload, high efficiency. Third, small volume, buried underground, which can be empty position to give the pool beautification effect.

Network filter: by setting to block spam information, make the information on the computer screen as far as possible.

Light filter: the principle of absorption will separate different colors of light and absorb some light that is not needed.

Installation position:

(1) in the general low-pressure devices pressure below 140kg / cm2, only suction filters are commonly installed, but backflow filters and air filters should also be installed.

(2) In the general medium and high-pressure liquid device with the pressure above 140kg / cm2, the reflux filter is generally used to control the pollution concentration. However, for special reliability requirements, a high pressure line filter shall be used.

(3) For the electromagnetic proportional control valve or small flow adjustment valve to increase its reliability, a terminal filter should be installed.

(4) When using the servo valve, efforts should be made to reduce the pollution concentration of the system, therefore, the high pressure and return filter should be used; in the large capacity, the circulating filter should be set up, and the terminal filter should be installed in the auxiliary pipeline.

By performance: line filter; double tube filter; high pressure filter

According to the industry: hydraulic oil filter: mainly used in the oil filtration industry, including oil absorption filter, oil return filter, pipeline filter, etc. Food filter: dust filter, air filter, air conditioning filter. Medical filters: pharmaceutical liquid filter, respiratory filter, blood filter, bacterial filter.

Attention: Install the oil filter in the hydraulic system usually has the following positions:  ⑴ Should be installed at the oil suction port of the pump: The surface oil filter is generally installed on the pump oil absorption road, and the purpose is to filter off large impurity particles to protect the hydraulic pump. In addition, the oil filter should be more than twice the pump flow, and the pressure loss is less than 0.02MPa.

⑵Mounted on the oil outlet road of the pump: The purpose of installing the oil filter here is to filter out the contaminants that may invade the components such as the valve class. The filtration accuracy shall be 10~15 m, and it can withstand the working pressure and impact pressure on the oil road, and the pressure drop shall be less than 0.35MPa. The safety valve should also be installed to prevent the blockage of the oil filter.

⑶Install on the oil return path of the system: this installation acts as an indirect filter. Generally, install a back pressure valve with the filter. When the filter blockage reaches a certain pressure value, the back pressure valve opens.

⑷Install on the system branch oil road.

⑸Separate filtration system: a large hydraulic system can be specially equipped with a hydraulic pump and oil filter to form an independent filter circuit.

In addition to the oil filters required for the whole system, a special refined oil filter is often installed separately in front of some important components (such as servo valve, precision throttle valve, etc.) to ensure their normal operation.