JPH0313403U

JPH0313403U -

Info

Publication number: JPH0313403U
Application number: JP7304089U
Authority: JP
Priority date: 1989-06-23
Filing date: 1989-06-23
Publication date: 1991-02-12

Description

[Brief explanation of the drawing]

第１図は第１の本考案を蒸気タービン低圧最終
段に適用した一例を示す要部の断面図、第２図は
第１図の−線断面図、第３図はその低負荷及
び無負荷運転時における蒸気流動パターンを示す
図である。第４図は、第１の本考案を蒸気タービ
ン低圧最終段に適用した他の例を示す要部の断面
図である。第５図は第２の本考案を蒸気タービン
低圧最終段に適用した一例を示す要部の断面図、
第６図はその分割された複数のフローガイド板を
示す平面図、第７図はその低負荷及び無負荷運転
時におけるフローガイド板の姿勢を示す図、第８
図は同じくその低負荷及び無負荷運転時における
蒸気流動パターンを示す図である。第９図は、従
来技術の一例として、蒸気タービン低圧最終段に
おける低負荷及び無負荷運転時の蒸気流動パター
ンを示す図である。１……動翼、１ａ……動翼先端、２……静翼、
３……フローガイド板、４……ケーシング壁、５
……排気室、７……開口、８……流動制御扉、９
……ピボツト、１０……通路、１３……フローガ
イド板、１４……ピボツト、１５……ジヤツキ。 Figure 1 is a cross-sectional view of the main parts showing an example of applying the first invention to the low-pressure final stage of a steam turbine, Figure 2 is a cross-sectional view taken along the - line in Figure 1, and Figure 3 is a low-load and no-load stage. FIG. 3 is a diagram showing a steam flow pattern during operation. FIG. 4 is a sectional view of essential parts showing another example in which the first invention is applied to the low-pressure final stage of a steam turbine. FIG. 5 is a cross-sectional view of the main parts showing an example of applying the second present invention to the low-pressure final stage of a steam turbine;
Fig. 6 is a plan view showing the plurality of divided flow guide plates, Fig. 7 is a view showing the posture of the flow guide plates during low load and no load operation, and Fig. 8 is a plan view showing the plurality of divided flow guide plates.
The figure also shows the steam flow pattern during low-load and no-load operation. FIG. 9 is a diagram showing a steam flow pattern during low-load and no-load operation in the low-pressure final stage of a steam turbine, as an example of the prior art. 1... Moving blade, 1a... Moving blade tip, 2... Stationary blade,
3...Flow guide plate, 4...Casing wall, 5
...Exhaust chamber, 7...Opening, 8...Flow control door, 9
...Pivot, 10...Passage, 13...Flow guide plate, 14...Pivot, 15...Judge.

Claims

[Claims for Utility Model Registration] 1. A plurality of openings or passages leading to the exhaust chamber are formed at intervals in the circumferential direction in a portion of the flow guide plate or casing wall facing the tip of the final stage rotor blade. An axial flow turbine characterized in that a flow control door is provided at each of the openings or the entrances of the passages so as to be openable and closable. 2 The flow guide plate surrounding the final stage rotor blade is divided into a plurality of pieces along the circumferential direction, and each of these divided flow guide plates is provided so as to be pivotable about its upstream end as a fulcrum. axial flow turbine.