Air filter basic introduction

Air Filter refers to air filter devices, which are generally used in clean workshops, clean workshops, laboratories and clean rooms, or for dust prevention of electromechanical communication equipment. There are primary filter, medium efficiency filter, high efficiency filter and sub-efficient model. Various models have different standards and performance.

In pneumatic technology, air filters, pressure reducing valves and oil misters are called pneumatic three. In order to obtain a variety of functions, the three gas source processing elements are often assembled in order, which is called a pneumatic triple piece. It is used for purifying and filtering, decompressing and providing lubrication.

The installation order of the three major parts is air filter, pressure reducing valve and oil mister in the order of intake air. The three-piece is the indispensable air source device in most pneumatic systems. It is installed near the gas equipment and is the final guarantee for the quality of compressed air. Its design and installation, in addition to ensuring the quality of the three major parts, also consider saving space. It is easy to operate and install, and can be combined in any way.


(1) coarse filter

The filter material of the coarse filter is generally a non-woven fabric, a wire mesh, a glass filament, a nylon mesh or the like. Commonly used coarse filters include: ZJK-1 type automatic winding type herringbone air filter, TJ-3 type automatic winding flat type air filter, CW type air filter, and the like. Its structural form is plate type, folding type, belt type and winding type.

(2) Medium efficiency filter

Commonly used medium efficiency filters are: M-I, II, IV foam filters, YB glass fiber filters, and the like. The filter material of the medium efficiency filter mainly includes glass fiber, medium pore polyethylene foam and synthetic fiber felt made of polyester, polypropylene, acrylic and the like.

(3) High efficiency filter

Commonly used high efficiency filters are available in GB and GWB types. The filter material is ultra-fine glass fiber filter paper with very small pores. The use of a very low filtration rate enhances the screening and diffusion of small dust particles and therefore has a high filtration efficiency.

Classification and function

The compressed air coming out of the gas source contains excessive water vapor and oil droplets, as well as solid impurities such as rust, sand, pipe sealant, etc., which will damage the piston seal ring and block the small vent holes on the components. Shorten the life of components or disable them. The function of the air filter is to separate the liquid water and liquid oil droplets in the compressed air, and filter out the dust and solid impurities in the air, but cannot remove the gaseous water and oil.

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