Damp lashing strip structure of industrial steam turbine high load short vane

Abstract

The invention relates to a damp lashing strip structure of an industrial turbine high load short vane. Each vane is composed of a vane body, a vane root and a middle connecting body. A whole circle of vanes are evenly installed on a rotor from the vane root along the peripheral direction. A lashing strip is arranged at the top of the vane body. The lashing strips at each two adjacent vanes are arranged in a tightly adhesive mode. An axial wedged groove is formed in a matching face of each of the two adjacent lashing strips in a milling mode. A wedged damping block is arranged in each wedged groove. Two ends of the bottom of each wedged groove are respectively provided with a sealing groove along the peripheral direction. Sealing shoulders are arranged on the position, corresponding to the sealing grooves, on each wedged damping block. According to the damp lashing strip structure of the industrial turbine high load short vane, the peripheral length of each wedged damping block can be increased as large as possible in the condition that a wedge angle is controlled well so that centrifugal force is increased and damping effect is good. Shear stiffness of the damp lashing strip is large so that the effect of bunching the vanes can be achieved, and therefore dynamic stress can be effectively reduced and short vane strength vibration performance is achieved in the condition of large load and high temperature.

Description

technical field [0001] The invention relates to the field of steam turbine shrouds, in particular to a damping shroud structure for high-load short blades of industrial steam turbines. Background technique [0002] A steam turbine is a power device that converts the thermal energy of water vapor into mechanical energy. Industrial steam turbines are driving equipment mainly used to drive feed water pumps, compressors and other industrial fields, and are characterized by complex variable working conditions and large speed ranges. As the synthesis gas compressors in the petrochemical industry have developed towards high efficiency and high parameters in recent years, the industrial steam turbines that match them are also under greater challenges. The increase in speed and steam load will affect the safety of the blades. posed serious challenges. [0003] The blade will vibrate under the action of steam force and its own centrifugal force, resulting in dynamic stress. Especia...

AI Technical Summary

Problems solved by technology

Therefore, its damping requirements are high, and the damping block needs to be larger, and the high-pressure short blades are often small in size and compact in structure, so it is very difficult to design its damping shroud

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