Guide ring structure of low-pressure exhaust cylinder of steam turbine

Abstract

The invention discloses a guide ring structure of a low-pressure exhaust cylinder of a steam turbine. The guide ring structure of the low-pressure exhaust cylinder of the steam turbine comprises a flared guide ring body. The guide ring body is divided into a top arc section and a bottom arc section in the circumferential direction in the moving sequence of vortexes formed by exhaust steam during acting. The circumferential section of the top arc section of the guide ring body is smaller than the circumferential section of the bottom arc section of the guide ring body. The guide ring body is of a variable cross section structure in the circumferential direction. According to the guide ring structure of the low-pressure exhaust cylinder of the steam turbine, it is ensured that good, orderly and effective control over the vortex moving downwards can be achieved through the back side of the bottom arc section of the guide ring body, namely the top arc section is designed according to the generated top vortex structure and the bottom arc section is designed according to the downward-moving vortex structure on the horizontal plane, so that the main flow diffusion space of the low-pressure exhaust cylinder and the diffusion performance of the whole low-pressure exhaust cylinder are improved, and the total pressure lose can be effectively and reliably reduced; and the guide ring structure of the low-pressure exhaust cylinder of the steam turbine is reliable, economical and practical.

Description

technical field [0001] The invention relates to a low-pressure cylinder of a steam turbine, in particular to a component of the low-pressure cylinder of a steam turbine, and more specifically, a guide ring structure for a low-pressure exhaust cylinder of a steam turbine. Background technique [0002] The exhaust steam volume flow rate of the low-pressure cylinder of the steam turbine is very large, which makes the size of the low-pressure cylinder also large, and it is the largest equipment in the steam turbine. Since the pressure and temperature of the steam flowing through the low-pressure cylinder are relatively low, the structural strength of the low-pressure cylinder body is no longer the most important technical problem in the formation of the low-pressure cylinder. The main technical problem in the formation of the low-pressure cylinder is to ensure that it has sufficient rigidity. At the same time, the exhaust steam passage in the low-pressure cylinder should have re...

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Problems solved by technology

However, so far, no such research results have been made public in the industry; although the Chinese patent literature discloses a technology that opens a gap at the edge of the exhaust end of the guide ring, the name is "steam turbine exhaust diffuser diversion structure". and steam turbine" (public number: CN104533548, public date: April 22, 2015), but the notch structure of the exhaust end of the diversion ring disclosed in this technology is only used for the convenient loading and unloading of the upper half of the low-pressure outer cylinder, without considering the The exhaust aerodynamic performance of the flow ring contour line even realizes the easy loading and unloading of the upper half of the low-pressure outer cylinder by sacrificing part of the exhaust aerodynamic performance. That is to say, the gap at the exhaust end of the guide ring in this technology cannot be used Efficient and reliable guidance of the mainstream gas after turning over to the back of the guide ring

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