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Method for manufacturing a stage of a steam turbine

一种汽轮机、构造成的技术，应用在制造工具、机械设备、发动机元件等方向，能够解决涡轮效率降低等问题，达到直接干预小的效果

Active Publication Date: 2016-08-03
NUOVO PIGNONE TECH SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this way the efficiency of the turbine is also reduced

Method used

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  • Method for manufacturing a stage of a steam turbine
  • Method for manufacturing a stage of a steam turbine
  • Method for manufacturing a stage of a steam turbine

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Embodiment Construction

[0022] The following description of the exemplary embodiments refers to the accompanying drawings. The same reference numbers in different drawings identify the same or similar elements. The following detailed description does not limit the invention. Instead, the scope of the invention is defined by the appended claims.

[0023] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the disclosed subject matter. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

[0024] Accordingly, the stages of a steam turbine will be described with reference...

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Abstract

A method for manufacturing a stage (1) of a steam turbine comprising the steps of milling a block of material to define a sector (2) having a plurality of blades (6), each blade (6) having an external surface (7); machining an opening (8) in the external surface (7) of at least one of the blades (6); machining a cavity (9) in fluid communication with the opening (8); the step of machining the cavity (9) being performed by wire electric discharge machining.

Description

technical field [0001] The invention relates to a method for manufacturing a stage of a steam turbine. In particular, the method concerns the manufacture of stages with hollow blades. Background technique [0002] In a steam turbine, partial condensation of steam occurs at its last stage or stages. [0003] Specifically, condensation occurs on the airfoil portion of the stator blade of the so-called "condensation stage", usually the last stage of the turbine. [0004] If droplets are generated as a result of condensation, they leave the stationary stator blades and they impact the rotating rotor blades; damage to the rotor blades may thus occur. [0005] To reduce damage caused by droplets, the rotational speed of the rotor blades can be reduced. In this way, however, the efficiency of the turbine is also reduced. [0006] Alternatively, in order to reduce any damage on the rotor blades, there are solutions to collect the condensate before generating the droplets. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/14F01D5/30F01D11/00F01D25/32
CPCF01D5/14F01D5/147F01D5/3038F01D11/008F01D25/32F05D2220/31F05D2230/51F05D2230/53F05D2230/12F05D2230/10B23C3/18B23C2215/44B23H9/14F01D5/021F01D5/12F01D5/3069F01D11/006F05D2300/10F05D2300/431
Inventor G.本奇尼M.格里利L.科西
Owner NUOVO PIGNONE TECH SRL