Low-pressure steam inlet structure of steam turbine

Abstract

The invention discloses a low-pressure steam inlet structure of a steam turbine. The low-pressure steam inlet structure comprises a steam inlet cavity defined by a low-pressure steam inlet upper half part and a low low-pressure steam inlet lower half part. The steam inlet cavity is provided with a steam inlet. The low-pressure steam inlet structure is characterized in that a first-level steam extraction cavity is formed in the part, close to a first-level partition plate arranging position, of the steam inlet cavity; the first-level steam extraction cavity comprises a first-level steam extraction cavity upper half part and a first-level steam extraction cavity lower half part; the first-level steam extraction cavity upper half part is defined by an outer surrounding plate, a small-diameter partition surrounding plate and a small vertical flange; the first-level steam extraction cavity lower half part is composed of two arc plates, a vertical flange connected with a low-pressure cylinder lower half part bottom barrel, the low-pressure cylinder lower half part bottom barrel and an outer surrounding plate; and a steam extraction pipe position is reserved at the low-pressure cylinder lower half part bottom barrel. Compared with an original structure, the number of flange crotches is reduced in the structure, the number of split bolts, the number of manholes is reduced, and the structure is simple and compact.

Description

Technical field [0001] The invention relates to a low-pressure cylinder of a steam turbine, in particular to a low-pressure steam inlet structure of a steam turbine. Background technique [0002] For the double-split low-pressure cylinder with symmetrical extraction after the first stage of low pressure, in order to separate the extraction chamber, usually a vertical opening gear is set before and after the first stage, and bolts are arranged in the horizontal middle. Such as figure 1 As shown, the first-stage extraction chamber 8 is provided on both sides of the inlet steam chamber 1. The first-stage extraction chamber 8 has the first-stage extraction chamber front opening 2 and the first-stage extraction chamber rear Open gear 3; for the assembly and disassembly of the split bolt 4, manholes 6 should be provided in the extraction chambers on both sides. Due to the large number of manholes in this structure, and the manhole must ensure sufficient axial width, the axial length o...

AI Technical Summary

Problems solved by technology

Due to the large number of manholes in this structure, and the manholes must ensure sufficient axial width, the axial length of the low-pressure cylinder near the first stage is particularly long

The axial length of the unit is also elongated, and the structural design is more complicated

The manufacturing difficulty and cost of the product increase, and the cost of the factory building also increases

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