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Mechanical end face seal (Mechanical Seal), is a dynamic seal for rotating shaft. Mechanical sealing performance, a small amount of leakage, long service life, low power consumption, without frequent repair, and can adapt the production process automation and high temperature, low temperature, high pressure, vacuum, high-speed and a variety of strong corrosive medium, medium containing solid particles such harsh conditions of the hungry seal requirements.
Mechanical seal is by one or several pairs of perpendicular to the shaft end relative sliding in the fluid pressure and the compensation mechanism of elastic (or magnetic) to maintain access under the merger with auxiliary seal and the seal to the resistance device leakage.
Mechanical seal with the soft packing seal is as follows:
Advantage.
1) reliable sealing, sealing state is very stable in the long run, leakage is small, its leak about the soft packing seal 1%;
2) and long service life, in oil, medium water general up to 1 to 2 years or longer, in the chemical medium can generally work more than half a year;
3) clean the power consumption is small, the friction power is only 10% ~ 50% of the soft packing seal;
4) the shaft or sleeve basically do not wear;
5) repair cycle is long, wear of surface can be automatically compensated, generally do not need regular maintenance and repair;
6) good vibration resistance, vibration of rotating shaft and shaft deflection on the seal cavity insensitive;
7) for a wide range of mechanical seal, it can be used in high temperature, low temperature, high pressure, vacuum, different frequency of rotation, and a variety of corrosive medium and containing abrasive medium seal.
Disadvantages:
1) is more complex, high requirements for processing;
2) and the replacement of more trouble to install, require workers to have a certain level of technology;
3) the occurrence of accident, processing more difficult;
4) price.