Mechanical sealing principle and its advantages and disadvantages - Solutions - Huaqiang Electronic Network

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Mechanical seals, also known as mechanical seals, are dynamic seals for rotating shafts. The mechanical seal has reliable performance, small leakage, long service life and low power consumption. It does not require frequent maintenance and can be adapted to the automation of production processes and high temperatures, low temperatures, high pressures, vacuum, high speeds and a variety of highly corrosive media. Hungry sealing requirements for demanding conditions such as solid particulate media. A mechanical seal is a shaft seal device that is held by a pair of pairs or pairs of oppositely acting end faces that are held in contact with the elastic force (or magnetic force) of the fluid pressure and the compensating mechanism. Gear oil pump requirements for mechanical seals, mechanical seals and soft packing seals are as follows:
Mechanical seal advantages
1) The seal is reliable, the sealing state is stable during long-term operation, the leakage is small, and the leakage is about 1% of the soft packing seal:
2) Long service life, generally up to 1 to 2 years or longer in oil and water media. Generally work in chemical media for more than half a year:
3) The friction power consumption is small, and the friction power is only 10% to 50% of the soft filler seal.
4) The shaft or bushing is basically not worn:
5) The maintenance period is long. After the end face is worn, it can be automatically compensated. Under normal circumstances, it does not require frequent maintenance:
6) Good shock resistance, not sensitive to the vibration of the rotating shaft and the deflection of the shaft to the sealed chamber:
7) Wide range of applications, mechanical seals can be used for high temperature, low temperature, high pressure, vacuum, different rotation frequencies, as well as a variety of corrosive media and seals containing abrasive media.
Mechanical seal disadvantage
1) More complicated, high processing requirements
2) Installation and replacement are more troublesome, requiring workers to have a certain level of skill.
3) When an accident occurs, the handling is more difficult.
Mechanical seals are high in price before sealing:
1) Check the model number of the mechanical seal. Whether the specifications meet the requirements of the design drawings, so the parts (especially the sealing surface, the auxiliary sealing ring) are damaged. Deformation. Cracks and other phenomena, if defective, must be replaced or repaired.
2) Check the fit size, roughness and parallelism of each part of the mechanical seal to meet the design requirements.
3) When using a small spring mechanical seal, check that the length and rigidity of the small spring are the same.
4) Check the host's turbulence. Whether the swing amount and the winding meet the technical requirements, whether the sealed cavity meets the installation scale, and whether the sealed end cap is perpendicular to the shaft. Generally, the shaft turbulence is not more than ±0.5 mm: the shaft swing amount (at the rotary ring seal) is not more than 0.06 Mm: The maximum winding length of the shaft is not more than 0.05mm: the tolerance of the non-perpendicularity of the contact plane between the sealing end cover and the gasket is 0.03~0.05mm.
5) It should be kept clean, especially the surface of the rotating ring and the stationary ring and the surface of the auxiliary sealing ring should be free from impurities and dust. It is not allowed to use the uncleaning surface.
6) It is not allowed to hit the sealing element with a tool to prevent the seal from being damaged.