A low-pressure inner cylinder axial landing structure of a steam turbine

Abstract

The invention discloses an axial landing structure of a low-pressure inner cylinder of a steam turbine, which includes a mid-section flange and a support arm; it is characterized in that it also includes two truss structures, and the two truss structures are respectively placed in two rows of the low-pressure inner cylinder Behind the deflector ring at the steam end; the truss structure is semicircular, and its two ends are fixedly connected to the mid-section flange; the mid-section flange overlaps the extended end of the support arm with a circular cross section, and The lapping surface is located on the outside of the deflector ring. The truss structure of the two steam exhaust ends of the low-pressure inner cylinder of the present invention shortens the length of the cantilever on the ground in the axial direction, and it is welded together with the flange of the mid-section surface, which increases the overall rigidity. The protruding end has a circular cross-section, and the overlapping surface of the low-pressure inner cylinder and the support arm is located outside the guide ring, so that it has good aerodynamic performance.

Description

technical field [0001] The invention relates to a low-pressure inner cylinder of a steam turbine, in particular to a low-pressure inner cylinder of a steam turbine with an axial landing structure. Background technique [0002] With the continuous development of high-parameter and large-capacity generator sets, the volume flow rate of the final stage of the steam turbine is large, and the structural size of the low-pressure inner cylinder is also increasing day by day. If the traditional structure is adopted, and the low-pressure inner cylinder is supported on the low-pressure outer cylinder, then the low-pressure outer cylinder needs to bear the gravity of the low-pressure inner cylinder parts in addition to bearing the vacuum load. This makes the low-pressure outer cylinder need to make many braces and ribs to ensure that it has sufficient strength and rigidity to meet the requirements of support. If the axial floor structure of the low-pressure inner cylinder is adopted, ...

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Problems solved by technology

However, due to the requirements of the final stage exhaust steam, the distance between the final stage blade and the end wall of the outer cylinder is relatively long, that is, the cantilever on the axial landing is longer, which makes it difficult to meet the rigidity requirements in the design of the axial landing structure of the low-pressure inner cylinder. the difficulty

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