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.