CN215256335U

CN215256335U - Interstage steam extraction sealing structure for steam turbine

Info

Publication number: CN215256335U
Application number: CN202120166527.7U
Authority: CN
Inventors: 刘一方; 彭博; 张颖; 张权; 蒋贤耀; 杨松花
Original assignee: China Chang Jiang Energy Group Corp
Current assignee: China Chang Jiang Energy Group Corp
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2021-12-21
Anticipated expiration: 2031-01-21

Abstract

The utility model discloses an interstage steam extraction seal structure for steam turbine, it is used for sealing the gap between cylinder casing and the preceding gland seal, an interstage steam extraction seal structure for steam turbine include: the steam blocking ring comprises two semicircular rings, and the two semicircular rings surround to form a complete circular ring; retaining member, the retaining member is two, two the retaining member corresponds locking two respectively keep off the adjacent end of vapour ring, the outer peripheral face of preceding vapour seal is provided with first annular groove, two the inboard equal coaxial embedded in of semicircle ring first annular groove, cylinder housing's inner peripheral surface is provided with second annular groove, two the outside of semicircle ring equal coaxial embedded in second annular groove: the steam blocking ring in the interstage steam extraction sealing structure is arranged between the cylinder shell and the front steam seal and used for improving the sealing performance of the connecting position of the cylinder shell and the front steam seal.

Description

Interstage steam extraction sealing structure for steam turbine

Technical Field

The utility model relates to a steam turbine technical field, concretely relates to interstage steam extraction seal structure for steam turbine.

Background

The front gland seal of the steam turbine is arranged at the front part of the steam turbine, and plays a role in reducing or preventing steam from leaking out and vacuum side air from leaking in. The front steam seal is generally divided into a plurality of sections, each section is internally provided with a plurality of steam seal rings, a steam chamber is arranged between the sections, and the steam leaked into the chamber is dredged away or sent into the chamber through a pipeline. The steam leakage in the steam seal is reasonably guided or extracted, the operating efficiency of the steam turbine can be effectively improved, however, an installation gap still exists at the connecting part of the front steam seal and the cylinder shell, and the risk of steam leakage exists at the position of the installation gap.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned technique not enough, provide an interstage steam extraction seal structure for steam turbine for the steam seal before sealed and cylinder casing's position of being connected, and will seal the dismouting that the fender steam ring split of usefulness becomes two semicircle ring structures that can assemble, thereby conveniently keep off the steam ring.

In order to achieve the above technical object, the present invention provides an interstage steam extraction sealing structure for a steam turbine, which is used for sealing a gap between a cylinder housing and a front gland seal, the interstage steam extraction sealing structure for the steam turbine comprising:

the steam blocking ring comprises two semicircular rings, and the two semicircular rings surround to form a complete circular ring;

the two locking parts are used for correspondingly locking the adjacent ends of the two steam retaining rings respectively;

the outer peripheral face of the front gland seal is provided with a first annular groove, the inner sides of the two semicircular rings are coaxially embedded in the first annular groove, the inner peripheral face of the cylinder shell is provided with a second annular groove, and the outer sides of the two semicircular rings are coaxially embedded in the second annular groove.

Compared with the prior art, the beneficial effects of the utility model include: the steam blocking ring in the interstage steam extraction sealing structure is arranged between the cylinder shell and the front steam seal and used for improving the sealing performance of the connecting position of the cylinder shell and the front steam seal, the steam blocking ring is split into two split semicircular ring structures, so that the split steam blocking ring is conveniently arranged in the first annular groove, then the two semicircular rings are fixedly connected through the locking piece to form a complete circular ring structure, and the two split semicircular ring structures enable the steam blocking ring to be more convenient to disassemble and assemble.

Drawings

Fig. 1 is a schematic cross-sectional view of an embodiment of an interstage steam extraction sealing structure for a steam turbine according to the present invention;

FIG. 2 is a schematic view of a portion of the enlarged structure at A in FIG. 1;

FIG. 3 is a schematic view of the connection structure of the connection part between the middle connection block and the steam stop ring;

fig. 4 is a schematic view of the connection structure of the side view of the connection part of the middle connection block and the steam stop ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 4, the present embodiment provides an interstage steam extraction sealing structure for a steam turbine, which is used for sealing a gap between a cylinder housing 1 and a front gland 2, and comprises: keep off vapour ring 3, retaining member 4, preceding gland seal 2 is the solid of revolution, a mounting groove fixed connection of seting up on preceding gland seal 2 and the cylinder housing 1, pivot an is located to the coaxial cover of preceding gland seal 2, and preceding gland seal 2 is used for sealing the clearance of turning the axle a.

The steam stop ring 3 comprises two semicircular rings 31, and the two semicircular rings 31 surround to form a complete circular ring.

The number of the locking pieces 4 is two, and the two locking pieces 4 respectively and correspondingly lock the adjacent ends of the two steam blocking rings.

The outer peripheral face of preceding gland sealing 2 is provided with first annular groove 2a, two the inboard of semicircle ring all coaxially embedded in first annular groove 2a, the inner peripheral face of cylinder housing 1 is provided with second annular groove 1a, two the outside of semicircle ring all coaxially embedded in second annular groove 1 a.

The steam blocking ring 3 in the interstage steam extraction sealing structure is arranged between the cylinder shell 1 and the front steam seal 2 and used for improving the sealing performance of the connecting position of the cylinder shell 1 and the front steam seal 2 and dividing the steam blocking ring 3 into two split semi-circular ring structures, so that the steam blocking ring 3 after being split is conveniently arranged in the first annular groove 2a, then the two semi-circular rings 31 are fixedly connected through the locking pieces 4 to form a complete circular ring structure, and the two split semi-circular ring structures 31 enable the steam blocking ring 3 to be more convenient to disassemble and assemble.

In this embodiment, each of the locking members 4 includes four connecting blocks 41 and two screws 42, wherein two of the connecting blocks 41 are respectively welded and fixed to two sides of one end of one of the semicircular rings 31, another two of the connecting blocks 41 are respectively welded and fixed to two sides of one end of another one of the semicircular rings 31, each of the connecting blocks 41 is provided with a connecting hole, a screw tail of each of the screws 42 passes through one of the connecting holes and is then in threaded connection with the other connecting hole, and an adjacent end of each of the two semicircular rings 31 is fixed, specifically, one of the two connecting holes connecting the same screw 42 is a through hole 41a, the other connecting hole is a threaded hole 41b, one end of each of the screws 42 close to the screw head thereof is an optical axis, one end of each of the screws 42 far from the screw head thereof is provided with an external thread, a portion of each of the screws 42 having an optical axis is coaxially disposed in the through hole 41a, the part of the screw 42 with the external thread is connected with the threaded hole 41b, the structure does not need to be provided with a nut, the use of the nut is saved, the connection structure of the adjacent ends of the two semicircular rings 31 is introduced here, the connection structure of the other ends of the two semicircular rings 31 is the same, and the description is omitted here.

In this embodiment, a first chamfer 2b is provided at a position where the first annular groove 2a is connected to the outer peripheral surface of the front gland 2, and a second chamfer 1b is provided at a position where the second annular groove 1a is connected to the inner peripheral surface of the cylinder housing 1, so that the semicircular ring 31 can be more smoothly clamped into the first annular groove 2a and the second annular groove 1a, and for the convenience of the reader to understand the scheme, what needs to be described here is: the cylinder housing 1 is a casting, the cylinder housing 1 comprises two detachable parts, the second annular groove 1a is formed by splicing two semi-annular grooves, and the two semi-annular grooves are respectively arranged on the two detachable parts of the cylinder housing 1.

The side wall of the steam blocking ring 3 is provided with a positioning groove 3b, the interstage steam extraction sealing structure for the steam turbine further comprises a positioning block 5, one end of the positioning block 5 is fixedly connected with the cylinder shell 1 or/and the front steam seal 2, the other end of the positioning block 5 extends to the positioning groove 3b and limits the steam blocking ring 3 to rotate, in this embodiment, one end of the positioning block 5 is fixedly connected with the front steam seal 2, the other end of the positioning block 5 is provided with a projection 5a, and the projection 5a extends into the positioning groove 3b The downside, the linking area who is located upside and downside is provided with constant head tank 3b to fix a position through locating piece 5, two other linking area are located the left and right sides that keeps off vapour ring 3, because figure 1 is the cross-sectional view of side, keep off vapour ring 3's left side and is thrown, the right side is sheltered from, for the convenience of reader's understanding, do further description here: the steam blocking ring 3 is composed of two semicircular rings 31 which are oppositely arranged up and down, so that the left side and the right side of the steam blocking ring 31 are connecting parts at two ends of the two semicircular rings 31, and the two locking parts 4 are respectively arranged at the left side and the right side of the steam blocking ring 31.

Further, the cross section of the inner side of the steam blocking ring 31 is a water drop-shaped structure 31c, and the water drop-shaped structure 31c includes a hemispherical end 31c1 and a tip end 31c2 connected to the hemispherical end 31c1, the hemispherical end 31c1 is located at the bottom of the second annular groove 1a, the outer side of the steam blocking ring 31 is provided with a first bending portion 31d formed by bending towards one end of the steam blocking ring in the axial direction, when the outer side of the steam blocking ring 3 is clamped into the second annular groove 1a, the second annular groove 1a is elastically abutted to the first bending portion 31d, the first bending portion 31d is coaxial with the second annular groove 1a, and the sealing effect of the steam blocking ring 3 and the second annular groove 1a is further improved by the first bending portion 31d in an elastic abutting mode.

Further, a first elastic groove 31e is formed in one side of the steam blocking ring 3, the first elastic groove 31e is annular, the first elastic groove 31e is coaxial with the steam blocking ring 3, the first elastic groove 31e is located in one side of the first bending portion 31d in the bending direction, and the elasticity of the first bending portion 31d is improved due to the arrangement of the first elastic groove 31 e.

The working principle is as follows: the steam blocking ring 3 in the interstage steam extraction sealing structure is arranged between the cylinder shell 1 and the front steam seal 2 and used for improving the sealing performance of the connecting position of the cylinder shell 1 and the front steam seal 2, the steam blocking ring 3 is split into two split semicircular ring structures, so that the split steam blocking ring 3 is conveniently arranged in the first annular groove 2a, then the two semicircular rings 31 are fixedly connected through the locking piece 4 to form a complete circular ring structure, the two split semicircular ring structures 31 enable the steam blocking ring 3 to be more conveniently assembled and disassembled, a protection cavity b is formed between the front steam seal 2 and the cylinder shell 1, steam leaked into the protection cavity b is blocked by the steam blocking ring 3, a steam extraction port is further arranged in the protection cavity b, the steam leaked into the protection cavity b is removed from the steam extraction port, and the acting force of the steam on a cylinder is effectively reduced, and the stability of the unit operation is enhanced.

The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An interstage steam extraction seal structure for a steam turbine for sealing a gap between a cylinder casing and a front gland, the interstage steam extraction seal structure for a steam turbine comprising:

2. The interstage steam extraction sealing structure for the steam turbine as claimed in claim 1, wherein each locking member comprises four connecting blocks and two screws, two of the connecting blocks are respectively welded and fixed on two sides of one end of one semicircular ring, the other two connecting blocks are respectively welded and fixed on two sides of one end of the other semicircular ring, each connecting block is provided with a connecting hole, and the screw tail of each screw penetrates through one connecting hole to be in threaded connection with the other connecting hole, so that one adjacent end of each semicircular ring is fixed.

3. The interstage steam extraction seal structure for a steam turbine according to claim 1, wherein a portion where the first annular groove connects with the outer circumferential surface of the front gland is provided with a first chamfer.

4. The interstage steam extraction sealing structure for the steam turbine according to claim 1, wherein a portion where the second annular groove is connected with the inner circumferential surface of the cylinder housing is provided with a second chamfer.

5. The interstage steam extraction sealing structure for the steam turbine as claimed in claim 1, wherein the side wall of the steam blocking ring is provided with a positioning groove, the interstage steam extraction sealing structure for the steam turbine further comprises a positioning block, one end of the positioning block is fixedly connected with the cylinder shell or/and the front steam seal, and the other end of the positioning block extends to the positioning groove and limits the rotation of the steam blocking ring.

6. The interstage steam extraction seal structure for a steam turbine according to claim 1, wherein a first bent portion bent toward one end in the axial direction of the steam retainer ring is provided on the outer side of the steam retainer ring.

7. The interstage steam extraction sealing structure for the steam turbine according to claim 6, wherein a first elastic groove is formed in one side of the steam blocking ring, the first elastic groove is annular, the first elastic groove is coaxial with the steam blocking ring, and the first elastic groove is located on one side in a bending direction of the first bending portion.

8. The interstage steam extraction seal structure for a steam turbine according to claim 1, wherein the cross section of the inner side of the steam retainer ring is a drop-shaped structure, and the drop-shaped structure comprises a hemispherical end and a tip connected to the hemispherical end, and the hemispherical end is located at the bottom of the second annular groove.