JPH08260906A - Drain receiver of guide cone - Google Patents

Abstract

PURPOSE: To provide a device for surely smoothly guiding drain flowing along a guide cone to a condenser. CONSTITUTION: A guide cone provided with an outside ring 1, outside face plate 2, inside face plate 3, a plurality of ribs 4, slits 5 and holes 6 to guide steam to an exhaust chamber is provided with a tubular inside ring 7 fixed at a right angle to the surface of the inside face plate 3 opposed to the outside face plate 2 and a vertical flange 8 mounted perpendicularly to the inner surface of the outside ring 1 and at right angle to the inside ring 7. Thus, drain flows from the slits 5 around the inside ring 7, reaches the bottom of the outside ring 1 and is guided through holes 6 to a condenser.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain of a guide cone for guiding steam to an exhaust chamber of a steam turbine.

[0002]

2. Description of the Related Art Steam flowing into a steam turbine is introduced into an exhaust chamber while gradually reducing its pressure. A guide cone is attached to the inlet inner diameter side of the exhaust chamber so as to face the rotor blades of the turbine. FIG. 2A is a partially sectional front view of a conventional guide cone, and FIG. 2B is a BB sectional view of FIG. Figure 2
In, the guide cone straddles the annular outer face plate 2 and inner face plate 3, which are vertically opposed to each other, the outer ring 1 which covers the outer faces of the outer face plate 2 and the inner face plate 3, and the outer face plate 2 and the inner face plate 3. From a plurality of ribs 4 arranged radially in the outer ring, slits 5 cut along the vicinity of the joint with the inner side plate 3 of the outer ring 1, and holes 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 the direction from the inner side plate 3 to the outer side 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 through the hole 6 at the bottom of the outer ring 1.

[0003]

However, in the structure of the conventional guide cone, the drain flowing from the slit 5 drops and contacts the rotor, and the low-pressure blade, the gland packing, etc. attached to the rotor are touched and rubbed. May cause damage to them.

An object of the present invention is to provide a drain receiving device which can smoothly and surely guide the drain flowing from the slit of the guide cone to the condenser.

[0005]

[Means for Solving the Problems] An annular outer face plate and an inner face plate, which are located on the inner diameter side of an exhaust chamber inlet of a steam turbine and vertically face each other, and an outer side which covers outer peripheries of the outer face plate and the inner face plate. A ring, a plurality of ribs radially arranged in the outer ring, a slit carved along the vicinity of the joint between the outer ring and the inner side plate, and a hole drilled in the bottom of the outer ring. In a guide cone for guiding exhaust vapor to an exhaust chamber, a cylindrical inner ring fixed at a right angle to a surface of the inner side surface plate facing the outer side surface plate, and one end thereof is vertically attached to the inner surface of the outer side ring. The above object is achieved by the provision of an annular vertical flange, the other end of which is mounted at right angles to the inner ring.

[0006]

In 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 composed of the inner side plate, the inner ring and the vertical flange, and is drilled at the bottom of the outer ring. It is discharged to the condenser from the hole.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 (A) is a partial sectional front view of a guide cone equipped with a drain receiver according to an embodiment of the present invention, (B).
FIG. 4B 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 designated by the same reference numerals and the description thereof will be omitted. In the present invention, a cylindrical inner ring 7 is welded at a right angle to the outer surface plate 2 of the inner side plate 3, and one end is welded perpendicularly 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 through bottom of outer ring 1
Is located between the vertical flange 8 and the inner side plate 3.
The steam discharged from the low-pressure blade of the rotor is guided to the guide cone and flows toward the exhaust chamber. The drain transmitted along the outer circumference of the outer ring 1 flows to the outer circumference of the inner ring 7 from the slit 5 cut along the vicinity of the joint with the inner surface plate 3 of the outer ring 1, and is further 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 is led from the hole 6 in the outer ring 1 to the condenser. According to the present invention, the drain does not drop from the inner surface of the outer ring 1 to the rotor.

[0008]

According to the present invention, the slit cut on the inlet side of the outer ring of the guide cone, the inner ring and the vertical flange are provided, and the drain transmitted through the outer ring flows from the slit around the inner ring. It reaches the bottom and is then led to the condenser through a hole in the bottom of the outer ring. Therefore, the drain does not touch the low-pressure blade, gland packing, etc. and damage them. Further, the rigidity of the guide cone itself can be improved by providing the vertical flange.

[Brief description of drawings]

FIG. 1A is a partial sectional front view of a guide cone provided with a drain receiver according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along line BB of FIG.

2A is a partially sectional front view of a conventional guide cone, and FIG. 2B is a BB sectional view of FIG. 2A.

[Explanation of symbols]

 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)

[Claims] 1. An annular outer face plate and an inner face plate, which are located on an inner diameter side of an exhaust chamber inlet of a steam turbine and which are vertically opposed to each other, an outer ring which covers outer peripheries of the outer face plate and the inner side plate, A plurality of ribs radially arranged in the outer ring, a slit cut along the vicinity of the joint portion of the outer ring with the inner side plate, and a hole formed in the bottom portion of the outer ring, the steam In a guide cone for guiding the exhaust gas to the exhaust chamber, a cylindrical inner ring fixed at a right angle to the surface of the inner surface plate facing the outer surface plate, and one end perpendicular to the inner surface of the outer ring and the other end A drain receiving device for a guide cone, comprising an inner ring and an annular vertical flange mounted at a right angle.