Steam turbine bearings

Steam turbine bearings

Bearing bore diameter range:400-810mm

Speed range:1500rpm-3600rpm

Power:300MW,600MW,800MW,1000MW

Use for steam turbine

Tilting pads with LEG

Maximum linear speed:120m/s

Average pressure:3.0Mpa

Pads base material:42CrMo or Cu-Cr

Spherical pivot,Self-alignment

Bearing clearance be adjustable

With RTD ,lower temperature rise and vibration

Babbitt (Tegostar 738) meets Europe REACH requirements

E-mail : [email protected]

Steam turbine bearings Details

Steam turbines bearings are often subjected to high loads, high speeds and high temperatures, especially as capacity and efficiency demands increase.

To ensure optimum dynamic characteristics in specific operating conditions, BHS Bearings applies a variety of specialized design features to bearing solutions.

For medium turbines used plain journal bearing. They may be ring lubricated sleeve bearings with bronze or Babbitt lining. Both flooded and force types are employed.

For larger turbines, the radial bearing will be a tilting pad type. The number of pad per bearing will be selected based on the weight of the rotor. For these types of bearing forced lubrication is used.

The thrust bearing is located on the free end of the rotor or we can say at the steam inlet of the turbine. The axial thrust force is very small for impulse turbines. This is due to the presence of pressure equalizing holes in the rotor discs to balance the thrust force generated across the disc. A simple thrust bearing such as a radial babbitt facing on journal bearings are commonly used in small and medium-size turbines. Tilling pad thrust bearings are used in the large steam turbines.Our bearings are exchangeable of GE bearing,Siemens bearings.

We provided journal bearing,radial bearings for steam turbine power from 5MW-1000MW

About Us

Zhejiang BHS Journal Bearing Co., Ltd. is a professional Steam turbine bearings Manufacturers and Steam turbine bearings factory, has been focusing on slide bearing’s design, manufacture, experiment and fault diagnosis for many years, BHS has become an excellent supplier of solutions for sliding bearing systems in China.

The company has more than 50sets of precision CNC machining center, Babbitt alloy casting equipment, Babbitt alloy sprayer, heat treatment, and other equipment. The annual production capacity of 26,000 sets of slide bearings. Through continuous technological research, the company has the ability to manufacture various types of slide bearings.

Our company approved by ISO:9001-2015, ISO:14001-2015, ISO:45001-20018, Standardization Safty production Certificate, National High-Tech Enterprise certificate, Provincial High-Tech Enterprise certificate, Military supplier certificate and variety of patents 30 kinds.

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Industry Knowledge Expansion

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.

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