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Nozzle of steam turbine with structure of groove face by using electron beam bonding

An electron beam welding and welding groove technology is applied in the field of welding structure of steam turbine nozzles, which can solve the problems of affecting the efficiency of steam turbines, many related parts, and difficult assembly, and achieves simplification of structure, reduction in volume, and difficulty in protection. Effect

Active Publication Date: 2007-12-26
HARBIN TURBINE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a steam turbine nozzle with a grooved surface structure welded by electron beams, which can not only solve the problems of complex structure, many related parts, difficult assembly and large volume when the steam turbine nozzle adopts an inlaid structure. The problem that affects the further improvement of steam turbine efficiency can also make up for the gap in the domestic steam turbine manufacturing field that there is no electron beam welding for steam turbine nozzles

Method used

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  • Nozzle of steam turbine with structure of groove face by using electron beam bonding
  • Nozzle of steam turbine with structure of groove face by using electron beam bonding

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specific Embodiment approach 1

[0008] Embodiment 1: This embodiment will be described with reference to FIGS. 1 to 3 . The nozzle 101 of this embodiment is composed of a nozzle chamber 1 and a nozzle group 2 ; the extension of the lower welding groove surface 3 between the nozzle chamber 1 and the nozzle group 2 The line intersects the point E of the Y-direction central axis of the nozzle 101, the distance H between the point E and the center point 0 of the nozzle 101 is 1100mm, and the clip between the lower welding groove surface 3 and the Z1 direction line passing through the point E The angle α is 40°, the extension line of the upper welding groove surface 4 between the nozzle chamber 1 and the nozzle group 2 intersects the point F of the Y-direction central axis of the nozzle 101, the point F is located above the point E, and the point F to The distance h from point E is 5mm, and the angle β between the upper welding groove surface 4 and the Z2 direction line passing through point F is 40°.

specific Embodiment approach 2

[0009] Embodiment 2: This embodiment will be described with reference to FIG. 2 and FIG. 3 . The inner point G of the lower welding groove surface 3 of this embodiment intersects with the center point O of the nozzle 101 as the center of the circle and the diameter Φ1 is 1014mm. The above technical parameters are used to facilitate the welding positioning between the groove surface of the nozzle group 2 and the groove surface of the nozzle 1 . Other components and connection relationships are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Embodiment 3: This embodiment will be described with reference to FIG. 2 and FIG. 3 . The inner end point N of the upper welding groove surface 4 of this embodiment intersects on a circle with the center point O of the nozzle 101 as the center and a diameter of Φ2 of 1196 mm. The above technical parameters are used to facilitate the welding positioning between the groove surface of the nozzle group 2 and the groove surface of the nozzle 1 . Other components and connection relationships are the same as in the first embodiment.

[0011] During welding, the nozzle 101 is placed on the variable turntable by using the complementary relationship in geometry. After adjustment, the variable turntable is deflected by 50°, and the horizontal welding of the outer arc is carried out. After the external arc is welded, the inner arc is carried out. For welding, the material of the nozzle is 1Cr9MoVNiN, the thickness of the nozzle is 45mm, and the welding vacuum degree is 7.4×10 -4 m...

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Abstract

This invention relates to a seal structure of turbine nozzles, in which the prolonged lines of lower welding groove faces between a nozzle chamber and a nozzle set meet at point E of Y central axes of a nozzle and the distance H between point E to the central point O of the nozzle is 1100mm, and the included angle between the lower groove face and Z1 direction line over point E is 40deg., prolonged lines of the upper groove faces between the chamber and the set meet at point F of the Y-oriented central axes of the nozzle and F is above E, the distance between them is 5mm and the included angle between the upper groove face and the Z2 line over point F is 40deg., which finishes two seams of a nozzle at one run with electronic beams.

Description

technical field [0001] The invention relates to a welding structure of a steam turbine nozzle. Background technique [0002] The nozzle is the gateway for high-pressure steam to enter the steam turbine, and it is one of the important parts of the steam turbine. The manufacturing of the nozzle adopts a mosaic structure for a long period of time. Due to the complex design structure, many related parts, difficult assembly, and large volume, it affects the further improvement of the efficiency of the steam turbine. [0003] With the development of welding technology, the advantages of vacuum electron beam welding have been fully utilized. The majority of designers consider using the advantages of electron beam welding to change the steam turbine nozzle into a welded structure, that is, the nozzle group and the nozzle chamber are assembled and welded together, so that The structure of the nozzle can be greatly simplified, the volume of the nozzle can be reduced, and the working ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D9/02
Inventor 宫在龙李全华杨浩徐涛
Owner HARBIN TURBINE
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