Mechanical seal air film seal leakage and friction power-

Mechanical seal air film seal leakage and friction power

　2017-11-07　　

Mechanical seal air film seal leakage and friction power:

The mechanical seal gas film seal has a large end face gap, and the gas leakage is large, but compared with other non-contact seals (such as labyrinth seals), the leakage is relatively low. The gas film seal leakage mainly depends on the sealed The gas pressure, the speed of the shaft and the diameter of the shaft. The leakage of the gas film seal shown in Figure 3-8 (standard state 0℃, 0.1MPa) is based on the condition of the shaft diameter of 120mm, which is for reference only. Mounted mechanical seal

Figure 3-8 Leakage of gas film seal (shaft diameter is 120mm)

When the mechanical seal air film seal is in operation, because the end faces are not in contact, the power is consumed by the shear of the air film between the end faces, so the friction power is very small, about 5% of the oil-lubricated ordinary mechanical seal. Figure 3-9 shows the friction power of the air film seal under the condition of a shaft diameter of 120mm. The frictional power will be converted into heat, which will increase the temperature of the sealing end face and the sealing cavity.

Figure 3-9 Friction power of gas film seal (shaft diameter is 120mm)

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