Vibration reducing and pressure bearing damping structure for blade root platform of movable blades

Abstract

The invention discloses a vibration reducing and pressure bearing damping structure for a blade root platform of movable blades. The vibration reducing and pressure bearing damping structure for the blade root platform of the movable blades comprises an impeller, the movable blades and a plurality of damping blocks. The blade roots of the movable blades are mounted on the impeller. A plurality of impeller grooves and a plurality of blade root platform grooves matched with the impeller grooves are formed in the impeller and the blade root platform of the movable blades respectively. Each impeller groove and the corresponding blade root platform groove form an installation groove. The multiple damping blocks are sequentially mounted in the corresponding installation grooves. During operation, the damping blocks make close contact with the blade root platform, so that dry friction damping is formed; when the blades are subjected to shock excitation under the action of airflow force, the damping blocks move relative to the contact surfaces between the damping blocks and the blade root platform, so that dry friction force is generated, the vibration level of the blade root platform is reduced, and vibration reducing effect is achieved. Meanwhile, not only all teeth of the impeller make contact with the blade roots to bear the centrifugal force of the blades, but also the damping blocks make contact with the blade root platform to share the centrifugal force of the blades. The vibration reducing and pressure bearing damping structure for the blade root platform of the movable blades is simple, convenient to assemble and disassemble, and capable of effectively increasing the damping of the blade root platform, reducing the vibration of the blades and improving the safety stability of a unit.

Description

Technical field: [0001] The invention relates to a steam turbine moving blade, in particular to a vibration-reducing, pressure-bearing and damping structure of the root platform of the moving blade. Background technique: [0002] The steam turbine blade is a key component of the steam turbine. Its function is to convert the thermal energy of the working medium with high temperature and high pressure into mechanical energy, which is very important for the safe operation of the steam turbine. The blades of the steam turbine are heavily loaded, the working environment is relatively harsh, and the teeth of the blade root bear a relatively high pressure. The blades are prone to vibration under the action of the excitation force of the airflow and the deviation of manufacturing and installation. Reducing the bearing pressure of the blade root and the vibration level of the blade is very important to ensure the safe and reliable operation of the whole machine. [0003] In the desi...

AI Technical Summary

Problems solved by technology

The general measure is to add a wedge-shaped damping block at the blade root platform. The damping block contacts the blade root platform under the action of centrifugal force to reduce vibration, but the damping block will increase the centrifugal force of the blade, and the pressure on the contact surface is limited by the structural size of the damping block. limit

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