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Split stationary blade of steam turbine having small crown structure and machining method thereof

A processing method and steam turbine technology, which can be applied to mechanical equipment, engine components, machines/engines, etc., can solve problems such as increasing production processes, and achieve the effect of saving production costs.

Active Publication Date: 2016-01-20
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned process of dividing the faceted stator blade, there is a process that requires partial cutting and repair welding on the inner and outer belts, which leads to an increase in the production process

Method used

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  • Split stationary blade of steam turbine having small crown structure and machining method thereof
  • Split stationary blade of steam turbine having small crown structure and machining method thereof
  • Split stationary blade of steam turbine having small crown structure and machining method thereof

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Embodiment Construction

[0019] Such as Figure 1 to Figure 4 Shown: a steam turbine with a small shroud structure, including a blade body 1, a crown 4 and a bottom shroud 5, the blade body 1 is located below the top shroud 4 and the bottom shroud 5 according to the dividing line of the middle split plane 6 A part is machined away in the direction of the steam passage at each place, and this part is not more than 1 / 4 of the length of the airfoil, and the width is 3mm, so that the airfoil 1 of this part does not enter the hole 9. Actually, the standard stationary blade 8 is cut according to the above requirements.

[0020] A method for processing the faceted stator vane in the above-mentioned steam turbine with small crown structure, comprising the following steps:

[0021] 1) Find the position of the dividing line 6 of the horizontal mid-section plane on the stationary blade 7 of the mid-section plane; mark the positions with lines on the crown 4 and bottom crown 5 respectively;

[0022] 2) Cut off ...

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Abstract

The invention discloses a split stationary blade of a steam turbine having a small crown structure, which comprises a blade body, a top crown and a bottom crown. The split stationary blade is characterized in that the blade body is respectively machined off one part in a steam passage direction at the top crown and the bottom crown below a split cutting line, so that the part of the blade body dose no enter a molding hole. A machining method of the split stationary blade comprises the following steps: 1) the position of a horizontal split cutting line on the split stationary blade is found out, and is respectively underlined on the top crown and the bottom crown; 2) one part of the blade body is cut off in the steam passage direction in the underlined places of the top crown and the bottom crown; and the part of the blade body cannot enter the molding hole; and 3) it detects if the cutting is tidy and in place until the requirements are accorded with. The method prevents the complex flow of repair welding after local cutting in the shroud molding hole split area, and effectively saves the production cost for high-yield production of separation plates.

Description

technical field [0001] The invention designs a steam turbine diaphragm stator blade, specifically a faceted stator blade in a steam turbine with a small crown structure and a processing method thereof. Background technique [0002] In the production of steam turbine diaphragms, the stator blades with small crowns are usually welded with the holes in the inner and outer belts to form a full circle of cascades, and then the cascades are cut into upper and lower halves from the middle section to Useful for subsequent installations. The part of the static vanes located on the split plane is in the upper half of the cascade, and the other part is in the lower half of the cascade, so that when the cascade is divided into upper and lower halves, the two stationary vanes located on the left and right sides of the split plane can smoothly connect with the lower half of the cascade. When the shroud is separated, after the inner and outer belt holes are processed, the holes in the inn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D9/02
Inventor 黄果赵卫军王振锋徐晓康卢霞刘景呈曾娅
Owner DONGFANG TURBINE CO LTD
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