What are the characteristics of bellows-type mechanical seals?
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The compensation mechanism is a bellows, in which one of the sealing rings (the moving ring or the stationary ring) is integrated with the bellows, without any additional sealing ring in between (see Figure 8); this reduces the number of potential leakage points； It also reduces the frictional resistance of the compensation mechanism, thereby improving followability ； The operating temperature for welded metal bellows seals (Figure 8b) is not restricted by the auxiliary sealing ring ； The tetrafluoro bellows seal (Figure 8a) can be used in corrosive media. Its drawback is that some bellows have low elasticity, requiring an auxiliary spring, as shown in (Figure 8a).
The main features of the bellows-type mechanical seal are as follows: 1. It has a compact structure; the compensation mechanism is a bellows, with one of the sealing rings (the moving ring or the stationary ring) integrated with the bellows. There are no additional sealing rings, which reduces the number of potential leakage points. 2. Good followability: By removing the auxiliary sealing ring, the frictional resistance of the compensation mechanism is reduced, thereby improving the followability of the sealing ring. 3. Wide range of applicable environments: Welded metal bellows seals are not restricted by the temperature of auxiliary sealing rings, and PTFE bellows seals can be used in corrosive media. 4. Simplified design and manufacturing process: Since the bellows and seal ring are integrated, the design and manufacturing process is simplified. Its main drawback is that the elastic force of the bellows is low, and an auxiliary spring may need to be added, which could increase the complexity of design and manufacturing. .