FT-20 15kw Explosion proof Medium Pressure Blower for Chemical Dust Special Explosion proof Medium Pressure Blower

Description :

　　Sealing method of explosion-proof fan

　　The sealing performance is one of the important indicators of the reliability of fan operation. This is especially true in situations where high-pressure fans transport toxic, harmful, flammable, explosive, or valuable gases. If the sealing is not good, not only will a large amount of valuable gases be leaked, but more seriously, it will cause serious environmental pollution.

　　1. Maze seal

　　Maze seal, also known as pull ring seal or comb tooth seal, is widely used in fan products. The inter stage seal in fan products basically adopts maze seal, and the fan shaft end seal for conveying air also adopts maze seal in low pressure situations.

　　2. Floating ring seal

　　Floating ring sealing is the use of a pressure oil film formed between the main shaft of a high-pressure fan and the floating ring, which balances the combined pressure of the oil film with the external load (pressure of the working medium) to seal the axial leakage of the working medium. Due to the advantage of automatic centering of the floating ring seal, the sealing gap can be smaller, the leakage can be reduced accordingly, and the pressure of the sealing body can be adjusted according to the pressure of the sealed medium. The liquid friction state is maintained between the floating ring and the shaft, thereby avoiding mechanical wear.

　　This type of seal is used when the pressure is high or when transporting corrosive gases, ensuring that the transported gas does not leak outward.

　　3. Mechanical seal

　　Mechanical end face seal is a sealing device that achieves axial rotation by preloading the static and dynamic ring end face friction pairs with elastic elements and compressing the medium pressure and elastic element pressure. Mechanical seals generally use sealing fluid (turbine oil) with a pressure 2.5 to 3.5 higher than the sealed medium to seal the sealed medium. During the rotation process, an oil film is established on the friction surface, and the pressure of the oil film is from the outside to the inside, from high to low, and finally reaches equilibrium with the sealed medium. Due to the fact that the sealing fluid pressure is always greater than the sealed medium, the sealed medium generally does not leak, while there is a small amount of leakage of the sealing fluid inward. The leaked sealing fluid will be recycled through the oil return hole. Due to structural changes, mechanical seals have significantly reduced oil consumption compared to floating ring seals, but both belong to oil film seals.

　　4. Dry gas seal

　　Dry gas seal is a type of gas film seal, which is currently the most effective sealing form for the inlet and outlet of turbo compressors. It uses nitrogen or other harmless gases as a sealing medium. The requirement for the cleanliness of the sealing gas is high, and there is a relatively complex gas supply system.

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