Novel self-adjustment spring type steam seal

Abstract

The invention discloses a novel self-adjustment spring type steam seal and belongs to the technical field of steam turbines. A steam seal body is provided with spring pieces and spring piece pressing blocks which are combined in a mutually staggered and overlapped manner. One side of each spring pressing block is provided with a spring piece embedding groove, the spring thin pieces are matched with the spring piece embedding grooves, and one ends of the spring thin pieces are overlapped and riveted into the spring piece embedding grooves; spring piece supporting back teeth at the bottom of the steam seal body are matched with a rotor, and the inner periphery of each spring thin piece is matched with the outer diameter of the rotor. The novel self-adjustment spring type steam seal is reasonable in structural design, and the double-barreled question of greatly improving sealing performance and meeting the requirement for safe operation of a unit can be solved.

Description

[0001] Technical field: [0002] The invention relates to the technical field of steam turbines, in particular to a novel self-adjusting spring type steam seal. [0003] Background technique: [0004] A steam turbine is a large-scale, precision heat-power conversion power machine rotating at high speed. A certain axial and radial gap must be reserved between static bodies such as cylinders and baffles and rotating bodies such as main shafts and blades to prevent friction between moving and static parts of the unit during operation. In order to reduce the steam leakage in the seal gap, a seal device must be installed to keep the seal gap within the standard range and tend to the minimum value under the premise of ensuring no dynamic and static friction. Only in this way can we ensure that the steam leakage loss between each stage and each cylinder of the multi-stage steam turbine can be reduced, and the thermal efficiency of the unit can be improved. [0005] Among the various...

AI Technical Summary

Problems solved by technology

The steam seal is a transitional part between the static parts of the steam turbine. It is very easy to cause direct friction and collision between the static parts of the steam turbine due to the failure of the steam seal body, damage the large shaft of the steam turbine, and cause a major accident of permanent bending of the large shaft in serious cases.

Although there may be many reasons for the unsmooth start-up of the unit during operation, and even the major accidents of major bending shafts, the root cause reflected in the results is caused by dynamic and static friction, and the accident reflects the problem of dynamic and static gaps

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