Cryogenic centrifugal liquid pump is mainly used in liquid oxygen, liquid nitrogen, liquid argon and other cryogenic liquids. This kind of equipment generally adopts the mechanical seal of the edge welding metal bellows form.
1. Reasonable structure design can ensure that the mechanical seal does not break the seal face and bellows assembly in high speed operation;
2. Reasonable end contact ratio pressure can guarantee mechanical seal performance and avoid premature failure;
3. Reasonable friction materials can guarantee the normal friction performance and sealing performance under low temperature conditions, and avoid premature failure due to excessive wear and tear;
The proper heat treatment of the metal bellows section can eliminate the residual stress caused by welding, so as to avoid the fatigue failure during the long running process.