Technology for processing steaming chamber of steam turbine

Abstract

The invention discloses a technology for processing a steaming chamber of a steam turbine. In the technology, lugs are arranged at the front, the outboard side and the inner cambered surface of the shell of the steaming chamber; datum transformation is carried out on lugs at different positions to confirm the datum plane and adjust the external form of the irregular steaming chamber by adopting the datum transformation principle so as to process the steaming chambers of various sizes. The processing technology is completely applicable to the external form of the steaming chamber with an irregular circular arc structure, high machining accuracy of the inner and outer screw thread at an steam inlet of the steaming chamber, high requirements on integrated positioning of the steaming chamber, high finish size accuracy of the fan-shaped steam outlet and a nozzle groove, thus greatly improving the processing level of the steaming chamber structure of the steam turbine.

Description

technical field [0001] The invention relates to a steam chamber of a steam turbine, in particular to a processing technology of the steam chamber of a steam turbine. Background technique [0002] The steam chamber of the steam turbine, also known as the nozzle group chamber, is mainly used to accept the steam coming in from the steam inlet pipe and support the nozzle group. Its structure is as follows: figure 1 As shown, the steam chamber 1 includes a steam inlet 11 and a steam outlet 12 , and a gas channel is formed between the steam inlet 11 and the steam outlet 12 . The steam chamber 1 is fixedly installed on the high-pressure inner cylinder, and the structure is as follows figure 2 As shown, four steam chambers are generally installed on the high-pressure inner cylinder at the same time. The steam chambers are directly installed on the high-pressure inner cylinder. Inner center positioning. The rotor is installed in the circular cavity surrounded by four steam chambe...

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Problems solved by technology

[0003] At present, there are many problems in the processing of steam chambers with this shape. First, the shape of this steam chamber is very irregular. When processing the inner and outer diameter threads of the steam inlet and the shape of the steam outlet, it is difficult to find a processing machine. Therefore, it is very troublesome to process, and it is easy to produce large errors; moreover, because the processed steam chambers need to be combined in groups of four, so as to form a cavity for installing the rotor in the high-pressure cylinder, so It is necessary to require the machining accuracy of the four steam chambers to be exactly the same, to meet the processing size requirements, and at the same time to ensure the tightness of the combination of the four steam chambers and ensure that the rotor is located in the center of the circular cavity, while the current steam chambers are generally separate After the machining is completed, it is difficult to ensure that the machining accuracy of the four steam chambers is the same, which brings difficulties to the combination of the steam chambers in the high-pressure inner cylinder, which may affect the normal operation of the entire steam turbine

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