Cylindrical high pressure cylinder rear part structure of steam turbine

Abstract

The invention discloses a cylindrical high pressure cylinder rear part structure of a steam turbine. The cylindrical high pressure cylinder rear part structure is characterized by comprising a flow guide body, wherein the flow guide body is mounted on a high pressure outer cylinder gland casing; the flow guide body is positioned between a high pressure final stage moving blade and the high pressure outer cylinder gland casing, so as to fill the vacancy of a steam channel between the high pressure final stage moving blade and the high pressure outer cylinder gland casing; the flow guide body is divided into a plurality of flow guide body sections in the radial direction; the plurality of flow guide body sections are mounted at the upper half part and the lower half part of a high pressure cylinder; the mounting part of each of the flow guide body sections adopts a T-shaped structure; each of the T-shaped structures is mounted in a corresponding T-shaped groove in the high pressure outer cylinder gland casing. According to the cylindrical high pressure cylinder rear part structure of the steam turbine, the structure is simple and reliable, the disassembly and assembly is simple and easy to implement, the production and installation cost is low, steam vortex at the rear part of the high pressure cylinder is effectively reduced, steam loss is reduced, and the economy and efficiency of the high pressure cylinder are improved.

Description

technical field [0001] The invention relates to a steam turbine high-pressure cylinder, in particular to a rear structure of a steam turbine cylindrical high-pressure cylinder. Background technique [0002] The cylindrical high-pressure inner cylinder structure has no horizontal mid-section flange, the upper and lower cylinders are semi-cylindrical structures, and the upper and lower half cylinders are tightened by red collars. The structural design of the cylindrical cylinder can reduce the volume of the high-pressure outer cylinder. The cylinder assembly is completed in the manufacturing plant, and the high-pressure module is shipped to the power plant as a whole, which can ensure the assembly accuracy and effectively prevent the steam leakage caused by the partial deformation of the cylinder during operation. . Due to the above-mentioned advantages of the cylindrical cylinder, more and more steam turbine units adopt the structural design of the cylindrical cylinder. How...

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Problems solved by technology

However, if figure 1 As shown, when the cylindrical cylinder module is assembled, the high-pressure rotor and the high-pressure inner cylinder 1 need to be assembled and then integrated into the high-pressure outer cylinder 5. Due to the limitation of the assembly structure, there is a gap between the high-pressure final stage moving blade 3 and the high-pressure outer cylinder seal body 2. There is a large space 6, and when the high-pressure steam flows out from the high-pressure final stage moving blade 3, a vortex will be generated in this space, which affects the economy and efficiency of the high-pressure cylinder

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