Introduction to mechanical seals and packing seals
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This post was last posted by Black Gold on 2010-9-9 17:49 Can the editor introduce mechanical seals and packing seals? How to judge good from bad? What is the replacement principle? If there are any precautions, please attach descriptions to the pictures! ~~~Thanks
mechanical seal: http://bbs.hcbbs.com/viewthread.php?tid=363668&highlight=%BB%FA%D0%B5%C3%DC%B7%E2 Packing seal: http://bbs.hcbbs.com/viewthread.php?tid=223030&highlight=%CC%EE%C1%CF%C3%DC%B7%E2 The difference between mechanical seal and packing seal: http://bbs.hcbbs.com/viewthread.php?tid=627410&highlight=%BB%FA%D0%B5%C3%DC%B7%E2 http://bbs.hcbbs.com/viewthread.php?tid=128638&highlight=%CC%EE%C1%CF%C3%DC%B7%E2
mechanical seal http://baike.baidu.com/view/665611.htm?fr=ala0_1 Packing seal http://baike.baidu.com/view/1626032.htm?fr=ala0_1_1 Compared with soft packing seals, mechanical seals have the following advantages:: ①The seal is reliable in long-term operation, the sealing state is very stable, and the leakage is very small. According to rough statistics, the leakage is generally only 1/100 of that of a soft packing seal. ； ②The service life is long, generally 1 to 2 years or more in oil and water media, and more than half a year in chemical media. ； ③Low friction power consumption: the friction power of the mechanical seal is only 10% to 50% of that of the soft packing seal ； ④The shaft or bushing is essentially free from wear ； ⑤The maintenance cycle is long and the end face can be automatically compensated for wear. Under normal circumstances, no regular maintenance is required. ； ⑥Good vibration resistance, insensitive to the vibration and deflection of the rotating shaft and the deflection of the shaft to the seal cavity ； ⑦Wide range of applications: Mechanical seals can be used for sealing at low temperatures, high temperatures, vacuum, high pressure, different rotational speeds, as well as various corrosive media and media containing abrasive particles. ⑧Packing cannot meet the "zero leakage" requirements of many plants today. ； The basic adaptability range is wide and the arbitrariness is greater, but for factories, frequent replacement or maintenance will cause great losses to the factory. But its shortcomings are: ①The structure is complex and requires high manufacturing and processing requirements. ； ②Installation and replacement are troublesome and require workers to have a certain level of installation skills. ； ③When an accident occurs, it is difficult to deal with it ； ④The one-time investment is high.