CN216642225U

CN216642225U - Steam turbine inner casing drainage device

Info

Publication number: CN216642225U
Application number: CN202123343050.4U
Authority: CN
Inventors: 李振华; 段金鹏; 刘栋辉; 李夺; 于海欧; 冯占宸; 张喆; 易洪进; 刘晓东; 李晓刚; 郑志国
Original assignee: Shenyang Blower Works Group Corp; Shenyang Dewate Steam Turbine Power Co ltd
Current assignee: Shenyang Blower Works Group Corp; Shenyang Dewate Steam Turbine Power Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-05-31
Anticipated expiration: 2031-12-28

Abstract

The utility model provides a steam turbine inner cylinder drainage device which comprises a specially-made flange, a threaded bushing arranged at the top of the specially-made flange and a sealing ring sleeved outside the threaded bushing; the special flange is provided with a flange through hole, the threaded bushing is provided with a drain hole, and the flange through hole is communicated with the drain hole. The application provides a steam turbine inner casing hydrophobic means will condense the condensate water in the inner casing through flange through-hole, hydrophobic hole and discharge to the outside of outer cylinder, realizes that the inner casing is hydrophobic. Simultaneously, the steam turbine inner casing hydrophobic means that this application provided simple structure, reliable, it is convenient to install, dismantle.

Description

Steam turbine inner casing drainage device

Technical Field

The utility model relates to the technical field of steam turbines, in particular to a steam turbine inner cylinder drainage device.

Background

The steam turbine is a rotary steam power plant, which rotates and applies work to the outside of a rotor having a row of blades by passing high-temperature and high-pressure steam through a fixed nozzle to become an accelerated flow and spraying it onto the blades. Steam turbines are the main equipment of modern thermal power plants, and are also used in the metallurgical industry, chemical industry and ship power.

The cylinder is the casing of the steam turbine and is used for separating the through-flow part of the steam turbine from the atmosphere to form a closed steam chamber so as to ensure that the steam completes the energy conversion process in the steam turbine. The cylinder mainly comprises an outer cylinder and an inner cylinder, and the inner cylinder is placed in the outer cylinder. The condensed water formed by the condensation of the steam in the inner cylinder needs to be discharged to the outer cylinder through the hydrophobic structure and then discharged through the outer cylinder. In the conventional inner cylinder drainage device shown in fig. 1, a drainage hole is usually formed at the bottom of the inner cylinder, and the drainage hole is connected to the wall of the outer cylinder through a pipeline and then drained by a drainage pipe flange of the outer cylinder.

In the conventional inner cylinder drain apparatus shown in fig. 1, a space for installing a drain pipe is limited due to a narrow space between the inner cylinder and the outer cylinder. Especially for a high-pressure unit, in order to avoid too large pressure bearing at the joint of the pipelines, the drain pipe needs to be welded with the inner cylinder wall and the outer cylinder wall, and the welding operation is very difficult at the moment. In addition, when the unit is overhauled, the inner drain pipe needs to be disassembled first, and then the inner cylinder needs to be removed, so that the problem of difficult operation also exists.

SUMMERY OF THE UTILITY MODEL

The utility model provides a steam turbine inner cylinder drainage device, which aims to solve the problem that the existing inner cylinder drainage device is difficult to install.

The utility model provides a steam turbine inner cylinder drainage device which comprises a specially-made flange, a threaded bushing arranged at the top of the specially-made flange and a sealing ring sleeved outside the threaded bushing; the special flange is provided with a flange through hole, the threaded bushing is provided with a drain hole, and the flange through hole is communicated with the drain hole.

Preferably, there is a clearance between the sealing ring and both the threaded bushing and the inner cylinder, and there is also a clearance between the threaded bushing and the outer cylinder.

Preferably, a flange groove is formed in the top of the special flange, a flange internal thread is arranged in the flange groove, and the flange groove is in threaded connection with the threaded bushing through the flange internal thread; and the outer side of the top of the special flange is provided with a flange external thread, and the special flange is in threaded connection with the outer cylinder through the flange external thread.

Preferably, a drainage hole is horizontally arranged in the threaded bushing, and the drainage hole is communicated with the drainage hole and the sealing ring.

Preferably, the top of the threaded bushing is externally hexagonal.

Preferably, a pin hole is vertically formed in the side of the threaded bushing, and the pin hole is communicated to the outer cylinder.

Preferably, the sealing ring comprises an outer ring and an inner ring, and the inner ring is arranged at the inner bottom of the outer ring; the outer ring is inserted into the inner cylinder.

Preferably, the special flange is hermetically welded with the outer surface of the outer cylinder.

The technical scheme provided by the embodiment of the utility model can have the following beneficial effects:

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model, as claimed.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a conventional internal cylinder drainage device;

FIG. 2 is a schematic structural diagram of a steam turbine inner casing drainage device provided by an embodiment of the utility model;

FIG. 3 is a schematic structural diagram of a threaded bushing provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a seal ring according to an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of the structure at A in FIG. 2 according to an embodiment of the present invention;

the symbols represent:

1-specially-made flange, 2-threaded bushing, 3-sealing ring, 4-flange through hole, 5-hydrophobic hole, 6-inner cylinder, 7-outer cylinder, 8-flange groove, 9-drainage hole, 10-pin hole, 301-outer ring and 302-inner ring.

Detailed Description

Referring to fig. 2, fig. 2 shows a schematic structural diagram of a steam turbine inner casing drainage device provided by an embodiment of the present application. As shown in the attached figure 2, the steam turbine inner cylinder drainage device provided by the embodiment of the application comprises a special flange 1, a threaded bushing 2 and a sealing ring 3. Wherein, the special flange 1 and the thread bush 2 are arranged on the outer cylinder 7, and the thread bush 2 is arranged inside the outer cylinder 7; the seal ring 3 is arranged between the inner cylinder 6 and the outer cylinder 7. Because the inner cylinder 6 is located in the high-temperature operation area, the steam turbine inner cylinder drainage device provided by the embodiment of the application is also located in the high-temperature operation area, and therefore all parts of the steam turbine inner cylinder drainage device are made of high-temperature-resistant materials.

Specifically, the top of the special flange 1 is arranged inside the outer cylinder 7, and the other part of the special flange is arranged outside the outer cylinder 7. The top of the special flange 1 is provided with a flange groove 8, and the flange groove 8 is internally provided with a flange internal thread. The special flange 1 is in threaded connection with the threaded bushing 2 through the internal threads of the flange. And the outer side of the top of the special flange 1 is also provided with flange external threads, and the flange external threads are used for realizing threaded connection between the special flange 1 and the outer cylinder 7.

A flange through hole 4 is vertically arranged inside the special flange 1, and the flange through hole 4 is communicated with a drain hole 5 on the threaded bushing 2, so that condensed water can be conveniently discharged out of the outer cylinder 7 through the drain hole 5 and the flange through hole 4. In addition, in order to prevent the condensed water from leaking through the joint of the special flange 1 and the outer cylinder 7, the special flange 1 and the outer surface of the outer cylinder 7 are hermetically welded.

The threaded bushing 2 is arranged inside the outer cylinder 7 and on top of the tailored flange 1. The lower part of the threaded bushing 2 is provided with an external thread, thereby being connected with the special flange 1 through the thread. The threaded bushing 2 is vertically provided with a drain hole 5 in the interior as shown in fig. 3. The drain holes 5 are respectively communicated with the flange through holes 4 and the inner cylinder 6, therefore, condensed water discharged from the inner cylinder 6 enters the flange through holes 4 through the drain holes 5, and then is discharged from the outer cylinder 7 through the flange through holes 4, so that the condensed water is discharged.

In addition, water may be accumulated between the special flange 1 and the threaded bushing 2, so that in order to discharge condensed water accumulated between the special flange 1 and the threaded bushing 2, a drainage hole 9 is horizontally arranged inside the threaded bushing 2, and the drainage hole 9 is communicated with the drainage hole 5 and the sealing ring 3 respectively. Therefore, when condensed water is accumulated between the special flange 1 and the threaded bushing 2, the condensed water enters the drain hole 5 through the drain hole 9 and is further discharged out of the outer cylinder 7 through the flange through hole 4.

The top of the threaded bushing 2 is hexagonal, so that the threaded bushing can be conveniently mounted and dismounted by a wrench. In addition, a pin hole 10 is vertically provided in a side portion of the threaded bushing 2, and the pin hole 10 communicates with the outer cylinder 7. After the threaded bushing 2 is mounted on the outer cylinder 7, a shaft pin is inserted into the pin hole 10 and the outer cylinder 7 to fasten the threaded bushing 2 and the outer cylinder 7 through the shaft pin, so that the purpose of preventing the threaded bushing 2 from rotating relative to the outer cylinder 7 is achieved.

As shown in fig. 4 and 5, the sealing ring 3 is of an annular open structure, and two sides of the top of the annular ring are protruded. Specifically, the seal ring 3 includes an outer ring 301 and an inner ring 302, wherein the inner ring 302 is disposed at the inner bottom of the outer ring 301. The outer ring 301 is inserted into the inner cylinder 6 and the threaded bushing 2 is placed on the inner ring 302.

When the seal ring 3 is inserted into the inner cylinder 6 during installation, a gap is formed between the seal ring 3 and the inner cylinder 6 in both the height direction and the width direction. Further, gaps are present between the seal ring 3 and the threaded bushing 2, and between the threaded bushing 2 and the outer cylinder 7. The setting in clearance can make sealing ring 3, threaded bush 2 automatic adjustment at the mounted position between inner cylinder 6, outer cylinder 7, and can guarantee the thermal expansion when the unit moves, can not damage each part.

The steam turbine inner casing hydrophobic means that this application embodiment provided discharges the outside to outer cylinder 7 through flange through-hole 4, hydrophobic hole 5 the condensate water that will condense in inner casing 6, realizes that the inner casing is hydrophobic. Simultaneously, the steam turbine inner casing hydrophobic means that this application embodiment provided simple structure, reliable, it is convenient to install, dismantle.

Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.

It is to be understood that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The utility model is not limited to the precise arrangements that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.

Claims

1. The steam turbine inner cylinder drainage device is characterized by comprising a special flange (1), a threaded bushing (2) arranged at the top of the special flange (1) and a sealing ring (3) sleeved outside the threaded bushing (2); the special flange (1) is provided with a flange through hole (4), the threaded bushing (2) is provided with a drain hole (5), and the flange through hole (4) is communicated with the drain hole (5).

2. The steam turbine inner casing drainage arrangement according to claim 1, characterized in that there is a gap between the sealing ring (3) and both the threaded bushing (2), the inner casing (6), and also between the threaded bushing (2) and the outer casing (7).

3. The steam turbine inner cylinder drainage device according to claim 2, characterized in that a flange groove (8) is formed in the top of the special flange (1), a flange internal thread is formed in the flange groove (8), and the flange groove (8) is in threaded connection with the threaded bushing (2) through the flange internal thread; and the outer side of the top of the special flange (1) is provided with a flange external thread, and the special flange (1) is in threaded connection with the outer cylinder (7) through the flange external thread.

4. The steam turbine inner cylinder drainage device according to claim 2, characterized in that a drainage hole (9) is horizontally formed in the threaded bushing (2), and the drainage hole (9) is communicated with the drainage hole (5) and the sealing ring (3).

5. The steam turbine inner casing drainage device according to claim 2, characterized in that the top of the threaded bushing (2) is externally hexagonal.

6. The steam turbine inner casing drainage device according to claim 2, characterized in that the side of the threaded bushing (2) is vertically provided with a pin hole (10), and the pin hole (10) is communicated to the outer casing (7).

7. The steam turbine inner casing hydrophobic apparatus according to claim 2, wherein the seal ring (3) includes an outer ring (301) and an inner ring (302), the inner ring (302) being disposed at an inner bottom of the outer ring (301); the outer ring (301) is inserted into the inner cylinder (6).

8. The steam turbine inner casing drainage arrangement according to claim 2, characterized in that the tailored flange (1) is seal welded to the outer surface of the outer casing (7).