JP3468321B2 - Guide cone drain receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide cone drain for guiding steam to an exhaust chamber of a steam turbine. [0002] Steam flowing into a steam turbine is guided to an exhaust chamber while gradually reducing the pressure. A guide cone is attached to the inner diameter side of the exhaust chamber so as to face the rotor of the turbine. FIG. 2A is a partial cross-sectional front view of a conventional guide cone, and FIG. 2B is a BB cross-sectional view of FIG. FIG.
, The guide cone straddles the annular outer face plate 2 and the inner face plate 3 which are vertically opposed to each other, the outer ring 1 covering the outer circumference of the outer face plate 2 and the inner face plate 3, and the outer face plate 2 and the inner face plate 3. A plurality of ribs 4 radially arranged in the outer ring, a slit 5 cut along the vicinity of the joint between the inner surface plate 3 of the outer ring 1 and a hole 6 drilled in the bottom of the outer ring 1 It is configured. The outer side plate 2 is attached to the casing of the exhaust chamber, and the inner side plate 3 faces the rotor blades of the rotor. The steam flows in a direction from the inner face plate 3 to the outer face plate 2. At that time, the drain was configured to be guided from the slit 5 of the outer ring 1 along the inner surface of the outer ring to the condenser 6 through the hole 6 at the bottom of the outer ring 1. [0003] However, in the conventional guide cone structure, the drain flowing from the slit 5 falls and comes into contact with the rotor, so that the low pressure blade, the gland packing, and the like attached to the rotor. Touching can cause friction and can damage them. [0004] It is an object of the present invention to provide a drain receiving device that smoothly and reliably guides a drain flowing from a slit of a guide cone to a condenser. [0005] An annular outer surface plate and an inner surface plate which are located on the inner diameter side of the exhaust chamber inlet of the steam turbine and are vertically opposed to each other, and the outer circumferences of the outer surface plate and the inner surface plate are arranged. An outer ring to be covered, a plurality of ribs radially arranged in the outer ring, a slit cut along the vicinity of a connection portion of the outer ring with the inner surface plate, and a slit pierced at a bottom of the outer ring. A guide cone for guiding exhaust steam to the exhaust chamber, a cylindrical inner ring fixed at a right angle to a surface of the inner surface plate facing the outer surface plate, and one end on the inner surface of the outer ring. This object is achieved by providing an annular vertical flange which is mounted vertically and the other end of which is mounted at right angles to the inner ring. According to the present invention, the drain flowing from the slit of the guide cone is guided to the lower side of the guide cone through the annular space formed by the inner surface plate, the inner ring and the vertical flange, and the bottom of the outer ring is formed. It is discharged to the condenser through the hole drilled in. FIG. 1A is a partial sectional front view of a guide cone provided with a drain receiving device according to an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 1 (A) and 1 (B), the same parts as those in FIGS. 2 (A) and 2 (B) are denoted by the same reference numerals and description thereof will be omitted. In the present invention, a cylindrical inner ring 7 welded at a right angle to the outer surface plate 2 of the inner surface plate 3 and one end is perpendicularly welded to the inner surface of the outer ring 1 and the other end is perpendicular to the inner ring 7. A welded annular vertical flange 8 was provided. Hole 6 passing through the bottom of outer ring 1
Is located between the vertical flange 8 and the inner surface plate 3.
The steam discharged from the low-pressure blades of the rotor is guided to the guide cone and flows toward the exhaust chamber. The drain transmitted along the outer periphery of the outer ring 1 flows to the outer periphery of the inner ring 7 from the slit 5 cut along the vicinity of the joint between the outer ring 1 and the inner surface plate 3, and further, is perpendicular to the inner surface plate 3 and the inner ring 7. It flows through the annular space consisting of the flange 8 to the bottom of the guide cone and through the hole 6 of the outer ring 1 to the condenser. According to the present invention, the drain does not fall from the inner surface of the outer ring 1 to the rotor. According to the present invention, a slit cut on the inlet side of the outer ring of the guide cone, an inner ring and a vertical flange are provided, and the drain transmitted through the outer ring is moved from the slit to the periphery of the inner ring. To the bottom and then to the condenser through a hole in the bottom of the outer ring. Therefore, the drain does not touch the low-pressure blades, the gland packing and the like to damage them. Further, the rigidity of the guide cone itself can be improved by providing the vertical flange.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (A) is a partial sectional front view of a guide cone provided with a drain receiving device according to an embodiment of the present invention, and FIG. 1 (B) is a sectional view taken along line BB of FIG. 1 (A). is there. FIG. 2A is a partial sectional front view of a conventional guide cone, and FIG. 2B is a sectional view taken along line BB of FIG. 2A. [Description of Signs] 1 outer ring 2 outer side plate 3 inner side plate 4 rib 5 slit 6 hole 7 inner ring 8 vertical flange

Claims (1)

(57) [Claim 1] An annular outer face plate and an inner face plate which are located on the inner diameter side of the exhaust chamber inlet of a steam turbine and are vertically opposed to each other. An outer ring covering the outer periphery, a plurality of ribs radially arranged in the outer ring, a slit cut along the vicinity of a connection portion of the outer ring with the inner surface plate, and a bottom portion of the outer ring. A guide cone having a perforated hole and guiding steam to the exhaust chamber, wherein a cylindrical inner ring fixed at a right angle to a surface of the inner surface plate facing the outer surface plate, one end of which is an inner surface of the outer ring. A drain receiving device for a guide cone, comprising: an annular vertical flange attached vertically to the inner ring and the other end attached to the inner ring at a right angle.