Steam turbine slim blade and moving blade assembly consisting of same

Abstract

The invention relates to a steam turbine slim blade. The steam turbine slim blade comprises a blade body part, a blade root part, a surrounding belt and bosses, wherein the lower end of the blade bodypart is fixedly connected with the upper end of the blade root part, the surrounding belt is fixed at the upper end of the blade body part, the bosses are arranged at the upper end of the surroundingbelt at intervals, and the bosses are matched with steam sealing teeth; the blade root part is arranged to be a trapezoid shape with the length of an upper bottom longer than that of a lower bottom,a second waist line is determined through the upper bottom, the lower bottom and a first waist line of the trapezoid where the side face of the blade root part is located, a first side line of the side face of the blade body part is connected with the first waist line, a second side line of the side face of the blade body part is connected with the second waist line, and the second side line is located on an extension line of the second waist line. The invention further provides a moving blade assembly of a steam turbine. At least one steam turbine slim blade is arranged on the moving blade assembly of the steam turbine. According to the steam turbine slim blade, a bulging structure arranged on the upper side face of a standard moving blade is cut off, the flatness of the blade body part is improved, and the technical problem that a traditional standard moving blade is difficult to install due to the bulge on the traditional standard moving blade is solved.

Description

technical field [0001] The invention relates to the technical field of steam turbine moving blades, in particular to a steam turbine trimming blade and a moving blade group formed therefrom. Background technique [0002] The blade is a key part of a steam turbine. It is mainly divided into moving blades and stationary blades. The blade of a steam turbine is one of the most delicate and important parts. It needs to withstand high temperature, high pressure, huge centrifugal force, steam force, steam excitation force, corrosion and The combination of vibration and water droplet erosion in the wet steam zone. For conventional models, the moving blades are installed on the rotor in a ring shape; but for high-speed models, there are many types of moving blades, but there will be a standard moving blade that cannot pass through the blade root slot during assembly Installed on the rotor, the structure of the standard moving blade is as follows figure 1 As shown, the side of the b...

AI Technical Summary

Problems solved by technology

For conventional models, the moving blades are installed on the rotor in a ring shape; but for high-speed models, there are many types of moving blades, but there will be a standard moving blade that cannot pass through the blade root slot during assembly Installed on the rotor, the structure of the standard moving blade is as follows figure 1 As shown, the side of the blade root of the standard moving blade is set in a trapezoidal structure, and a section of protrusion 6 (curved surface) is provided on the side of the blade body part of the standard moving blade (that is, in the thickness direction), and the installation of the protrusion 6 on the blade It has caused great difficulties and seriously restricted the production and application of steam turbines

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