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What should be considered about the working conditions of steam turbine bearings in high temperature environments?
The high temperature environment in steam turbines will reduce the fluidity of the lubricant, so the bearings need to have good high temperature lubrication performance. For this purpose, high-temperature grease can be used as a lubricant. This kind of grease has high high-temperature stability and lubrication performance, and can maintain the lubrication effect under high-temperature and long-term working conditions.
The material selection and design of bearings need to consider factors such as thermal expansion and thermal stress at high temperatures. High-temperature environments will cause thermal expansion of bearing materials, so materials with good thermal expansion properties need to be selected and designed accordingly. One commonly used material is high-temperature alloy steel, which has high thermal stability and resistance to thermal expansion.
Bearings also need to have good thermal stress resistance in high temperature environments. Since high temperature environments can cause transient thermal stress in bearings, the structure and design of the bearings need to take this factor into account. For example, bimetallic structure bearings can be used to reduce thermal stress through the difference in thermal expansion coefficients of different materials to ensure normal operation of the bearing at high temperatures.
Bearing lubrication and cooling are also factors to consider in high-temperature environments. In high-temperature working environments, bearings need sufficient lubrication to reduce friction and wear. At the same time, the bearings also need to be effectively cooled to reduce the bearing temperature and keep it within an acceptable range.
For the working conditions of steam turbine bearings in high-temperature environments, in addition to having good high-temperature lubrication performance, factors such as thermal expansion and thermal stress of the bearing material and design also need to be considered, and corresponding lubrication and cooling measures must be taken to ensure that the bearings can Operates normally in high temperature environments.
Why do steam turbine bearings need good sealing performance?
In order to ensure the working performance and life of steam turbine bearings, it is necessary to have good sealing performance to prevent external impurities from entering the bearings. There are impurities such as dust, abrasive particles, and moisture in the operating environment of steam turbines. If these impurities enter the bearings, they will cause problems such as friction, wear, and scratches.
When designing and selecting steam turbine bearings, the sealing performance of the bearing needs to be considered. Sealing performance can be achieved by selecting appropriate sealing structures and materials. Commonly used sealing structures include contact seals and non-contact seals. Contact seals, such as oil seals and O-rings, can better prevent impurities from entering the bearing and reduce friction and wear to a certain extent. Non-contact seals, such as magnetic seals and gas seals, better prevent contaminants from entering the bearing.
Regular maintenance and inspection of bearing sealing performance are required. During use, bearing seals may deteriorate due to aging, wear or damage. Therefore, the condition of the seals needs to be checked regularly and replaced or repaired in time. Regular maintenance and inspection can also identify some potential problems and repair them in time to ensure the normal operation of the bearings.
Other measures can also be taken to improve the sealing performance of the bearing. For example, a sealing cover can be installed around the steam turbine to reduce the intrusion of external impurities into the bearings. At the same time, rolling bearings can be used, which have balls or rollers inside, which can reduce the sliding friction of impurities in the bearing. In addition, the use of high-quality lubricants and sealing oil seals can also improve the sealing performance of the bearing.
Steam turbine bearings need to have good sealing properties to prevent external impurities from entering the bearings. By selecting appropriate sealing structures and materials, regular maintenance and inspections, and taking other measures, the sealing performance of the bearing can be effectively improved and the working performance and life of the bearing can be guaranteed.
