CN218062407U

CN218062407U - Automatic adjust novel brush vapor seal in microgap

Info

Publication number: CN218062407U
Application number: CN202220938944.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Guizhou Derui Long Electric Power Technology Co ltd
Current assignee: Guizhou Derui Long Electric Power Technology Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-12-16
Anticipated expiration: 2032-04-21

Abstract

The utility model discloses a novel automatic-adjusting micro-gap brush type steam seal, belonging to the technical field of steam turbine sealing elements; the steam seal device comprises a plurality of steam seal arc blocks, wherein steam seal brush wires are arranged on the steam seal arc blocks; springs are arranged at the opposite ends of each steam seal arc block; a steam inlet channel is processed at the steam inlet side of the steam seal arc block, and a plurality of groups of steam seal tooth components are arranged at the lower part of the steam seal arc block; the brush wires are correspondingly arranged at the position of the steam seal tooth part of the steam seal arc block; the utility model discloses the problem that conventional vapor seal causes the steam turbine unit thermal efficiency low because the steam leakage is serious has been solved effectively.

Description

Automatic adjust novel brush vapor seal in microgap

Technical Field

The invention relates to the technical field of steam turbine sealing parts, in particular to a novel automatic-adjustment micro-gap brush type steam seal.

Background

The steam seal is a device which is arranged between the dynamic part and the static part of the steam turbine and reduces or prevents the leakage of steam and the leakage of air at the vacuum side; with the development of steam turbine technology, the requirements for steam sealing are gradually increased; the existing steam seal teeth form a plurality of annular chambers around the surface of a rotor when a steam turbine runs, steam mesons are throttled through gaps between the steam seal teeth and the surface of the rotor and perform energy conversion through expansion in the chambers formed by two adjacent teeth of the steam seal, and the capacity of converting heat energy into kinetic energy reaches the minimum due to continuous conversion of energy after the steam passes through the steam seal teeth, so that the purpose of blocking or reducing leakage of the steam mesons is achieved.

The rotor vibration generated by various reasons causes the clearance between the steam seal and the rotor to be increased, the throttling-expansion effect is reduced, the kinetic energy reduction amplitude of the steam meson is reduced, and the leakage amount of the steam meson is increased. The heat efficiency of the steam turbine set is seriously affected by the steam seal leakage.

Disclosure of Invention

The utility model aims at solving the problem that above-mentioned prior art exists, rotor vibration that various reasons produced promptly makes the clearance increase between gland sealing and rotor, and the effect of throttle-inflation reduces, and the kinetic energy reduction range of steam meson reduces, the volume of revealing of steam meson increase promptly. The steam leakage of the steam seal seriously influences the heat efficiency of the steam turbine unit, and further provides a novel automatic-adjustment micro-gap brush type steam seal.

Along with the continuous emergence of new technology, we effectively combine automatic regulating formula vapor seal technique and brush sealing technique through the research and development and the use for many years, and the innovation utility model discloses automatic regulating formula brush vapor seal.

The utility model provides a following technical scheme:

a novel automatic-adjusting micro-gap brush type steam seal; the steam seal brush type tooth steam seal device comprises a plurality of steam seal arc blocks, wherein the steam seal arc blocks are provided with steam seal brush type teeth; springs are arranged at the opposite ends of each steam seal arc block; a steam inlet channel is processed at the steam inlet side of the steam seal arc block, and a plurality of groups of steam seal tooth components are arranged at the lower part of the steam seal arc block; the brush teeth are correspondingly arranged at the positions of the steam seal tooth parts on two sides of the steam seal arc block.

The number of the steam seal arc blocks is 8, and the structural shape and the size of each steam seal arc block are the same.

The number of the springs on the corresponding side of each steam seal arc block is 4; the springs are columnar pressure springs, and each spring is designed according to actual working environment parameters.

The steam seal arc block and the steam seal tooth part are of an integrated structure and are made of 0Cr15Mo materials.

The steam inlet channel is processed at the middle position of the back of the steam seal arc block by adopting a milling process; two radial clearance adjusting holes are symmetrically arranged on the back of the steam seal arc block.

The radial clearance between the steam seal arc block and the rotor is controlled to be 0.10 mm-0.15 mm.

Each group of gland sealing tooth parts comprises high teeth and low teeth; the brush teeth are disposed between the high teeth and the low teeth.

The utility model discloses beneficial effect embodies in following several aspects:

1. the back plate spring of the traditional steam seal is cancelled, and four spiral springs are additionally arranged at the 45-degree position of each steam seal ring. When the machine is started, the steam seal arc block is in an open state and is far away from the rotor under the action of the spring force; after the unit is started, along with the increase of steam flow, the steam pressure acting on the back of each circle of steam seal arc block is gradually increased, and when the pressure is enough to overcome the stress of a spring, the friction resistance and the like, the steam seal arc block starts to be gradually closed until the steam seal arc block is in a working state, and the steam seal arc block always keeps running at the minimum clearance value with a rotor;

when the steam turbine is stopped, the steam seal arc block is far away from the rotor under the action of the stress of the spring along with the reduction of the steam flow, so that the radial clearance between the steam seal and the rotor reaches the maximum value. The technical performance characteristics of the automatic adjusting type steam seal ensure the safety of the start-stop operation of the unit and improve the operation efficiency of the unit.

2. The flexible brush wires are added between the traditional rigid steam seal teeth, so that the steam seal teeth become soft, the brush wires can be withdrawn randomly when colliding and grinding with the rotor, and the gap between the steam seal of the steam turbine and the rotor can be made smaller by using the brush wires. Usually, the minimum clearance between the steam seal and the rotor can only be 0.50-0.75 mm, and the brush type steam seal can achieve the clearance between the steam seal and the rotor to be 0.1-0.15 mm. When the steam medium passes through the brush bristle layer of the brush bundle, a turbulent flow effect is generated, and the flow rate of the steam is instantly reduced, namely the leakage amount is reduced.

This design utility model has combined the advanced principle of automatically regulated formula vapor seal and brush vapor seal, can guarantee the security when the unit opens to shut down and moves, also can the effectual economic nature that improves the unit operation.

Drawings

Fig. 1 is a schematic structural view of the utility model device in the present embodiment;

description of reference numerals: 1. the steam seal arc block 2, the brush wire 3, the steam inlet channel 4, the spring 5 and the steam seal tooth component.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments:

example (b):

referring to fig. 1, the present embodiment provides a novel self-adjusting micro-gap brush type steam seal; the steam seal device comprises a plurality of steam seal arc blocks 1, wherein steam seal brush wires 2 are arranged on the steam seal arc blocks 1; the opposite end parts of each steam seal arc block 1 are respectively provided with a spring 4; a steam inlet channel 3 is processed at the steam inlet side of the steam seal arc block 1, and a steam seal tooth part 5 is arranged at the lower part of the steam seal arc block 1; the brush wires 2 are correspondingly arranged at the position of the steam seal tooth part 5 of the steam seal arc block 1. In this embodiment, the brush filaments 2 are arranged at a position below the middle spring 4, and the brush filaments are mounted through grooves formed in the gland blocks.

The number of the steam seal arc blocks 1 is 8, and the structural shape and the size of each steam seal arc block 1 are the same.

The number of the springs 4 on the corresponding side of each steam seal arc block 1 is 4; the springs 4 are cylindrical pressure springs, and each spring is designed according to actual working environment parameters.

The steam seal arc block 1 and the steam seal tooth part 5 are of an integrated structure and are made of 0Cr15Mo materials.

The steam inlet channel 3 is processed at the middle position of the back of the steam seal arc block 1 by adopting a milling process; two radial clearance adjusting holes are symmetrically arranged at the back of the steam seal arc block 1.

The radial clearance between the steam seal arc block 1 and the rotor is controlled to be 0.10 mm-0.15 mm.

Each group of gland sealing tooth parts 5 comprises a high tooth 5A and a low tooth 5B; the brush filaments 2 are arranged between the high teeth 5A and the low teeth 5B. It should be noted that the mounting height of the brush filaments 2 in this embodiment is slightly greater than the height of the tall teeth 5A.

In this embodiment, the parameters of the automatically adjustable brush seal designed for a certain plant Ha steam NZK300-16.7/537/537 unit can be referred to Table 1:

TABLE 1

All units are mm

According to the upper table, the working clearance of the steam seal is optimized through the automatic adjustment type brush steam seal after transformation, so that the air leakage of the steam turbine is reduced by 35%, and the economical efficiency of the unit is better improved.

Claims

1. A novel automatic-adjustment brush type steam seal with a micro gap comprises a plurality of steam seal arc blocks (1), wherein steam seal brush wires (2) are arranged on the steam seal arc blocks (1); the method is characterized in that: springs (4) are arranged at the opposite ends of each steam seal arc block (1); a steam inlet channel (3) is processed at the steam inlet side of the steam seal arc block (1), and a plurality of groups of steam seal tooth parts (5) are arranged at the lower part of the steam seal arc block (1); the brush wire (2) is arranged at the position of the steam seal tooth part (5) of the steam seal arc block (1).

2. The self-adjusting new micro-gap brush steam seal of claim 1, further comprising: the number of the steam seal arc blocks (1) is 8, and the structural shape and the size of each steam seal arc block (1) are the same.

3. The self-adjusting new micro-gap brush steam seal of claim 1, further comprising: the number of the springs (4) on the corresponding side of each steam seal arc block (1) is 4; the springs (4) are columnar pressure springs, and each spring is designed according to actual working environment parameters.

4. The self-adjusting new micro-gap brush steam seal of claim 1, further comprising: the steam seal arc block (1) and the steam seal tooth component (5) are of an integrated structure and are made of 0Cr15Mo materials.

5. The self-adjusting new micro-gap brush steam seal of claim 1, further comprising: the steam inlet channel (3) is processed at the middle position of the back of the steam seal arc block (1) by adopting a milling process; two radial clearance adjusting holes are symmetrically arranged at the back of the steam seal arc block (1).

6. The self-adjusting new micro-gap brush steam seal of claim 1, further comprising: the radial clearance between the steam seal arc block (1) and the rotor is controlled to be 0.10mm-0.15mm.

7. The automatic adjusting novel micro-gap brush type steam seal according to claim 1, characterized in that: each group of gland sealing tooth parts (5) comprises a high tooth (5A) and a low tooth (5B); the brush filaments (2) are arranged between the high teeth (5A) and the low teeth (5B).