Marine steam turbine partition plate structure

Abstract

The invention aims to provide a marine steam turbine partition plate structure which comprises a partition plate body, a partition plate outer ring, a stationary blade, an outer shroud ring and an inner shroud ring, the top of the stationary blade and the outer shroud ring are fixed together, the bottom of the stationary blade and the inner shroud ring are fixed together, the partition plate outer ring and the outer shroud ring are fixed together, and the partition plate body and the inner shroud ring are fixed together. Compared with an existing marine steam turbine partition plate structure, the partition plate structure can use a partition plate body with the small width, sufficient welding strength is guaranteed through a combined welding mode, a sample piece welding strength test shows that the electron beam welding strength reaches 700 MPa or above, and sufficient strength is guaranteed for a blade at the position of a split cut in the molded line direction. The problems that a partition plate of a traditional marine steam turbine is too thick, the welding quality is low, and a split blade is prone to being damaged are effectively solved.

Description

technical field [0001] The invention relates to a steam turbine, in particular to a diaphragm of the steam turbine. Background technique [0002] As one of the main marine power, the marine steam turbine occupies an extremely important position. The diaphragm is one of the important components of the marine steam turbine. The diaphragm is fixed on the inner cylinder and is mainly used to separate all levels of the steam turbine. The steam passes through the diaphragm The rear steam flow is deflected and the pressure and temperature are reduced to convert the internal energy of the steam into kinetic energy, which is used for the rotor behind the diaphragm to push the rotor to convert the kinetic energy into mechanical energy to do work. The separator is mainly composed of the outer ring of the separator, the peripheral band, the static vane, the inner shroud and the separator body. [0003] The diaphragms of marine steam turbines are generally welded structures. First, the ...

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Problems solved by technology

[0003] Marine steam turbine diaphragms are generally of welded structure. First, the inner and outer peripheral belts and stator blades are transferred and then welded to form a whole with the outer ring of the diaphragm and the diaphragm body. This structure has been widely used. However, in the application process There are still some problems: the welding strength of the welding part is weak, and stress concentration and welding deformation are prone to occur during the welding process. In order to ensure sufficient strength, the thickness of the partition body will increase, resulting in an increase in the size and weight of the flow; in addition, the welded partition structure is The upper and lower half structure is divided into two halves at the middle split surface, so the blade at the middle split surface needs to be cut into two parts, and the upper and lower halves are assembled to form a whole, resulting in a decrease in the strength of the blade steam outlet, which is easy to be damaged under the action of high-speed airflow

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