Mixed-flow turbine runner spilled water hole processing technique

A processing technology and scupper hole technology, applied in the directions of hydroelectric power generation, mechanical equipment, engine components, etc., can solve the problems affecting the pressure at the upper crown, unstable operation of the unit, complicated processing operations, etc., to achieve the accuracy of processing positioning and processing. Good rigidity, improved workpiece yield and processing quality, and less processing parameters

Inactive Publication Date: 2008-09-10
SICHUAN DONGFENG ELECTRIC MACHINARY WORKS CO LTD
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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 Affe

Method used

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  • Mixed-flow turbine runner spilled water hole processing technique
  • Mixed-flow turbine runner spilled water hole processing technique
  • Mixed-flow turbine runner spilled water hole processing technique

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. figure 1 It is the processing diagram of the weep hole. In the figure, ∠1 is the angle between the orthographic projection of the center line of the weep hole in the sectional plane of the rotation axis of the upper crown and the center axis of the rotation, and ∠2 is the starting point of the weep hole at the center of the cross. The distribution angle within the line, ∠3 is the angle between the orthographic projection of the centerline of the weep hole in the sectional plane of the rotation axis of the upper crown and the horizontal line of the centerline of the cross.

[0021] The processing technology of the runner drain hole of the mixed-flow unit includes the following steps;

[0022] (1) Based on the inner and outer circles of the upper crown, draw the cross centerlines of -X-+X, -Y-+Y processing technology, and measure the orthographic projection...

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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...

Claims

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Application Information

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IPC IPC(8): B23B35/00F03B11/00
CPCY02E10/20
Inventor 李江涛
Owner SICHUAN DONGFENG ELECTRIC MACHINARY WORKS CO LTD
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