The function of thrust bearing is to bear the axial thrust of rotor in operation, and to determine and maintain the axial mutual position between turbine rotor and cylinder.

 

Thrust bearing can be set as a separate type, but also can be combined with the support bearing into one body, known as the combined type (thrust support combined bearing), according to the structure shape can be divided into multi-jaw type and fan-shaped tile type, now commonly used for fan-shaped tile type.

The main structure is composed of working tile, non-working tile, adjusting gasket, mounting ring and so on. 10 ~ 12 working tiles and non-working tiles are installed on both sides of the thrust plate. Each tile is installed on the mounting ring, the working tile bears the rotor forward axial thrust, the non-working tile bears the rotor reverse axial thrust.

 

 

The distance between the working tile and the non-working tile is called the thrust gap, generally not greater than 0. 4 mm. The thickness of black gold on the tile is generally 1. 5mm, its value is less than the minimum clearance between the dynamic and static parts of the turbine, to ensure that even in the case of wujin melting accident, the dynamic and static parts of the turbine will not friction with each other.