Locking structure of fork-shaped blade root of moving blade in high temperature section of steam turbine

Abstract

The invention discloses a forked blade root locking structure of moving blades in a high-temperature section of a steam turbine. The forked blade root structure comprises an impeller and the moving blades, wherein the moving blades are arranged on the impeller, blade roots of the moving blades are forked blade roots, assembling grooves which are matched with the forked blade roots are formed in the circumferential surface of the impeller, the blade roots of the moving blades are arranged in the assembling grooves, the moving blades are fixedly locked on the impeller by enabling a pin to penetrate through the blade roots and the impeller, and the pin is called as a core through pin and is positioned at the center positions of the blade roots; a blade root connecting seam of two adjacent moving blades is also provided with a pin, the pin penetrates through the blade roots and the impeller, and the pin which is arranged in the two adjacent blades in a crossing way is called as a seam crossing pin. According to the forked blade root locking structure of the moving blades in the high-temperature section of the steam turbine, disclosed by the invention, the heat stress can be reduced, and the safety of the blades is enhanced.

Description

technical field [0001] The invention relates to a steam turbine moving blade, in particular to a fork-shaped root locking structure of a moving blade in a high temperature section. Background technique [0002] The moving blades in the high temperature section of the steam turbine, especially the regulating stage moving blades with the highest operating temperature, have fork-shaped blade roots. on the impeller. Due to the different materials used for the moving blades, impellers and pins, there are differences in thermal expansion coefficients. At high temperatures, the joints of the pins, blade roots, and impellers will generate great thermal stress, which may shear the pins, causing the blades to fall off and cause accidents. . Contents of the invention [0003] In view of the above problems, the present invention provides a fork-shaped root locking structure of the moving blade in the high temperature section, which can reduce thermal stress and enhance the safety of...

AI Technical Summary

Problems solved by technology

Due to the different materials used for the moving blades, impellers and pins, there are differences in thermal expansion coefficients. At high temperatures, the joints of the pins, blade roots, and impellers will generate great thermal stress, which may shear the pins, causing the blades to fall off and cause accidents.

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