Analysis of the application of mechanical seals for pumps in the case of high-temperature media-

Analysis of the application of mechanical seals for pumps in high-temperature media

　2020-05-07　　

Application of pump mechanical seal under high temperature medium:

Now, mechanical seals are developing in the direction of high parameters (high temperature, high pressure, high speed and large shaft diameter). The high temperature direction is one of them. The viscosity and lubricity of most liquid media will decrease at high temperature, and the corrosiveness will increase. At the same time, the conventional auxiliary seal ring, end face seal pair and spring materials used will become unstable when the temperature is higher than 250°C. For example, rubber parts will lose elasticity, PTFE seals (the use temperature cannot be higher than 220 ℃) u200bu200blose their original dimensional accuracy, the end face of the hard seal will be thermally deformed or cracked, and the end face of the carbon graphite soft ring will have blisters. The temperature of the sliding end surface will cause coking and solidification, which will seriously affect the normal operation of the seal.

According to the choice of mechanical seal material, under high temperature conditions, hot-pressed sintered SiC for antimony graphite or solid cemented carbide for copper graphite is recommended for the sealing pair; high nickel alloy is recommended for spring material; auxiliary seal ring The material is preferably inorganic.

For the sealing of high temperature and flammable media, it is recommended to use a tandem mechanical seal with an unpressurized quench fluid. On the atmosphere side, the quenching fluid can prevent the deposition of cracked products, and it can also prevent the direct leakage of the warm medium.　　1130.html,

What are the life cycle cost analysis of mechanical seal system?　　 Problems with mechanical seal of high temperature medium pump