Mixed-flow turbine runner spilled water hole processing technique

Abstract

The invention discloses a processing technology of runner drain holes of a Francis turbine, a bored shaft is moved to point to a point to start the drilling according to a coordinate position Beta of the point to start the drilling on a cross central line and an rotation angle Alpha of a top crown that is relative to the bored shaft which are obtained by calculation, a first slant hole is drilled at the point to start the drilling, the bored shaft and the rotation center of the top crown are motionless, the top crown is rotated, thus allowing the point to start the drilling of the next drainage hole on the top crown to be pointed to the central line of the bored shaft and carrying out the processing of other holes sequentially. The processing method of the drain holes of the crown simplifies the processing steps, improves the processing precision and provides the powerful guarantee for the long-term stable operation of the Francis turbine unit.

Description

technical field [0001] The invention relates to a process for processing a runner crown drain hole in a mixed-flow water turbine unit. Background technique [0002] In the manufacturing process of the Francis turbine unit, the drain hole on the crown of the runner is closely related to the direction of rotation of the runner, the speed of rotation, and the pressure at the crown of the runner. The drain hole in the upper crown plays the role of water discharge and pressure stabilization. The spatial position accuracy of the drain hole after processing directly affects the pressure at the upper crown. Unsuitable pressure will lead to water leakage at the seal of the main shaft and unstable operation of the unit, thereby Affect the long-term stable operation of the unit. The position of the drain hole on the upper crown of the runner is neither parallel nor perpendicular to the positioning datum plane of the upper crown. If a drilling machine is used for processing, the inclin...

AI Technical Summary

Problems solved by technology

The drain hole in the upper crown plays the role of water discharge and pressure stabilization. The spatial position accuracy of the drain hole after processing directly affects the pressure at the upper crown. Unsuitable pressure will lead to water leakage at the seal of the main shaft and unstable operation of the unit, thereby Affect the long-term stable operation of the unit

The position of the drain hole on the upper crown of the runner is neither parallel nor perpendicular to the positioning datum plane of the upper crown. If the drilling machine is used for processing, the inclined tire tooling method must be used, and the processing operation is complicated.

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