Assembling method for the vibration damping structure of the shroud blades of the marine steam turbine with the external tension bars

Abstract

The invention relates to a blade tiepiece vibration reducing structure and an assembling method thereof, in particular to a marine steam turbine crown blade wrapped tiepiece vibration reducing structure and an assembling method thereof. The problems that an existing blade tiepiece vibration reducing structure is large in gap between sets of shroud rings and large in steam loss, and middle tiepieces reduce the through-flow flowing efficiency are solved. The blade structure is a blade body top blade crown structure, a blade crown is provided with vibration reducing tiepiece installation grooves, and vibration reducing tiepieces are installed inside the installation grooves and grind the two sides of the installation grooves. A straight arm structure peens and wraps the vibration reducing tiepieces in the vibration reducing tiepiece installation grooves. After the blade structure of the blade body top blade crown is assembled in a whole circle mode, installation grooves matched with the vibration reducing tiepieces are machined in the blade crown, and the two sides of each installation groove are provided with technical grooves. The vibration reducing tiepieces are arranged inside the installation grooves, the blade crown is ground by a grinding tool, the vibration reducing tiepieces are peenned and wrapped in the installation grooves, and finally the blade crown is machined in place according to the size requirement. The blade tiepiece vibration reducing structure is used for reducing vibration of a marine steam turbine blade.

Description

technical field [0001] The invention relates to a steam turbine blade tie rib vibration damping structure and an assembly method thereof, in particular to a ship-used steam turbine with crown blade outsourcing tension rib vibration damping structure and an assembly method thereof, belonging to the technical field of ship power steam turbines. Background technique [0002] Conventional marine steam turbine motor blades generally adopt a riveted shroud structure, and a tie bar is worn on the blade body for frequency modulation of the blade. This kind of structure requires higher skills of assemblers. In addition, due to the large gaps between the shrouds of each group, the amount of steam leakage is large, and the tie bars in the middle also reduce the flow efficiency of the flow. Contents of the invention [0003] In order to solve the problem that the gap between each group of shrouds is large, the amount of steam leakage is large, and the tie ribs in the middle reduce th...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the gap between each group of shrouds is large, the amount of steam leakage is large, and the tie ribs in the middle reduce the flow efficiency of the existing blade tie rib vibration damping structure, it further provides a frequency modulation that can meet the needs of the blade. Requirements, but also has a good flow efficiency of marine steam turbine with shroud blade outsourcing reinforcement vibration damping structure and its assembly method

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