Introduction to the sealing method of anticorrosive centrifugal fan

2021-07-06

The sealing characteristics of anticorrosive centrifugal fans determine the safety hazards of equipment applications. It is usually used to transport harmful, dangerous, flammable, flammable, and explosive vapors, with strong corrosiveness. If the seal is not good, it will cause serious air pollution and endanger life safety. The following describes the sealing method of the anticorrosive centrifugal fan:

1. Labyrinth closure

Labyrinth seal, also known as labyrinth seal and comb seal, is widely used in anticorrosive centrifugal fan products. Labyrinth seals are mostly used for inter-stage seals in anticorrosive centrifugal fan products, and labyrinth seals are also used for bearing end cover seals that convey gas.

2. The sealing performance of the floating ring

Floating ring seal uses the floating oil that generates working pressure between the spindle bearing and the floating ring to maintain the balance between the comprehensive working pressure of the floating oil and the external load (the working pressure of the steam parameter), and seal the radial leakage of the substance during operation. Since the sealing performance of the floating ring has the advantage of fully automatic alignment with the management center, the sealing gap can be smaller. With the reduction of leakage, the working pressure of the sealing body can be adjusted according to the working pressure of the sealed material. The fluctuation ring and the shaft Maintain the liquid friction state between them, so as to prevent mechanical equipment damage. This kind of seal is used to ensure that the delivered steam will not leak when the working pressure is high or corrosive steam is delivered.

3. Machine seal

The inner hole sealing of the anticorrosive centrifugal fan mechanical equipment is the clamping torque of the static and moving ring inner hole friction pairs by the elastic element and the working pressure of the material and the elastic element, which exceed the sealed radial rotary sealing equipment. The sealing material usually adopts a sealing fluid (turbine oil) whose working pressure is 2.5~3.5 higher than that of the sealing material. During the entire rotation process, the oil film is generated on the friction surface, and the working pressure of the oil film is looking outward, from large to small, and then exceeds the balance with the sealing material. Since the working pressure of the sealing liquid exceeds the sealing material from beginning to end, the sealing material is not easy to leak under normal circumstances, but a small amount of the sealing liquid leaks inward, and the leaked sealing liquid will be comprehensively used according to the oil return port. Because of the structural change, the residual oil in the mechanical seal is much less than the edible oil used in the floating ring seal, but they are all slick oil seals.

4. Air tightness

The air tightness is a gas film seal, which is a better sealing method for turbo refrigeration compressors, and the sealing effect is better. N2 or other harmless steam is used as the sealing material. The cleanliness of the sealed steam is very high, and there is a set of more complicated air system software.