CN217872939U - Automatic adjust novel micro-gap vortex gland packing - Google Patents
Automatic adjust novel micro-gap vortex gland packing Download PDFInfo
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- CN217872939U CN217872939U CN202220965365.8U CN202220965365U CN217872939U CN 217872939 U CN217872939 U CN 217872939U CN 202220965365 U CN202220965365 U CN 202220965365U CN 217872939 U CN217872939 U CN 217872939U
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Abstract
The utility model discloses a novel automatic-adjusting micro-gap vortex 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 vortex cavities 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 on 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 vortex cavity is correspondingly arranged at the positions of the steam seal tooth parts on the two sides of the steam seal arc block; the invention effectively solves the problem of low heat efficiency of the steam turbine unit caused by serious steam leakage of the conventional vortex steam seal.
Description
Technical Field
The invention relates to the technical field of steam turbine sealing elements, in particular to a novel automatic-adjustment micro-gap vortex 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 plurality of 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 severely affected by the steam leakage of the steam seal.
Disclosure of Invention
The utility model aims at solving the problem that above-mentioned prior art exists, the rotor vibration that various reasons produced promptly makes the clearance increase between gland seal 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 seal leakage seriously influences the heat efficiency of the steam turbine unit, and then a novel automatic-adjustment micro-gap vortex steam seal is provided.
Along with the continuous emergence of new technology, we effectively combine automatically regulated formula vapor seal technique and vortex tooth sealing technique through the research and development and the use for many years, and the innovation utility model discloses automatically regulated formula vortex tooth gets on the vapor seal.
The utility model provides a following technical scheme:
a novel automatic-adjustment micro-gap vortex steam seal; the steam seal device comprises a plurality of steam seal arc blocks, wherein steam seal vortex cavities 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 on 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 vortex cavity is correspondingly arranged at the positions of the steam seal tooth parts at the 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.
Turbulence small teeth are arranged on the vortex cavity and the steam seal tooth component.
The steam seal arc block and the steam seal tooth component 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 at the back of the steam seal arc block.
The radial clearance between the steam seal arc block and the rotor is controlled to be 0.20 mm-0.35 mm.
Each group of steam seal tooth components comprises a straight tooth group and an inclined tooth group; the vortex cavity is arranged between the straight tooth group and the helical tooth group.
In a preferred embodiment of the method of the invention,
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 original comb-tooth-shaped steam seal is improved, and in order to enable the steam seal to be better in capacity expansion and dissipation, the volume and the friction area of a steam seal cavity are increased under the condition that the structural strength allows; in order to reduce the flow velocity of steam and increase the steam blocking effect of a steam seal, a plurality of small turbulence teeth are added in the cavity, and the kinetic energy of the steam flow rushing into the cavity due to inertia of the high-speed steam flow is consumed, so that the steam flow is fully dissipated in the vortex cavity.
This design utility model has combined the advanced principle of automatically regulated formula vapor seal and vortex vapor seal, can guarantee the security that the unit opened when shutting down and moving, 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 device comprises a steam seal arc block 2, a vortex cavity 3, a steam inlet channel 4, a spring 5, a steam seal tooth component 5A, a straight tooth group 5B and an oblique tooth group.
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 vortex gland seal; the steam seal device comprises a plurality of steam seal arc blocks 1, wherein steam seal vortex cavities 2 are arranged on the steam seal arc blocks 1; the opposite end parts of each gland sealing arc block 1 are provided with springs 3; a steam inlet channel 3 is processed at the steam inlet side of the steam seal arc block 1, and 4 groups of steam seal tooth parts 5 are arranged at the lower part of the steam seal arc block 1; the vortex cavity 2 is correspondingly arranged at the positions of the gland sealing tooth parts 5 at the two sides of the gland sealing arc block 1.
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.
Turbulence small teeth are arranged on the vortex cavity 2 and the steam seal tooth part 5.
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 0.20 mm-0.35 mm.
Each group of gland sealing tooth parts 5 comprises a straight tooth group 5A and an inclined tooth group 5B; the vortex chamber 2 is arranged between the set of straight teeth 5A and the set of helical teeth 5B.
In this embodiment, the parameters of the automatically adjusted vortex gland for a CJK350-24.2/566/566 set design on a certain plant 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 improved automatic adjusting type vortex steam seal, so that the air leakage of the steam turbine is reduced by 30%, and the economical efficiency of the unit is better improved.
Claims (8)
1. A novel automatic-adjustment micro-gap vortex steam seal comprises a plurality of steam seal arc blocks (1), wherein steam seal vortex cavities (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 on the steam inlet side of the steam seal arc block (1), and a plurality of groups of steam seal tooth parts (5) are arranged on the lower part of the steam seal arc block (1); the vortex cavity (2) is correspondingly arranged at the positions of the steam seal tooth parts (5) at two sides of the steam seal arc block (1).
2. The self-regulating novel micro-gap vortex gland seal according to claim 1, wherein: 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 novel micro-gap vortex gland seal of claim 1, wherein: 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 novel micro-gap vortex gland seal of claim 1, wherein: turbulence small teeth are arranged on the vortex cavity (2) and the steam seal tooth part (5).
5. The self-adjusting novel micro-gap vortex gland seal of claim 1, wherein: the steam seal arc block (1) and the steam seal tooth component (5) are of an integrated structure and are made of 0Cr15Mo materials.
6. The self-adjusting novel micro-gap vortex gland seal of claim 1, wherein: 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).
7. The self-adjusting novel micro-gap vortex gland seal of claim 1, wherein: the radial clearance between the steam seal arc block (1) and the rotor is controlled within 0.20mm-0.35mm.
8. The self-adjusting novel micro-gap vortex gland seal of claim 1, wherein: each group of steam seal tooth parts (5) comprises a straight tooth group (5A) and an inclined tooth group (5B); the vortex cavity (2) is arranged between the straight tooth group (5A) and the helical tooth group (5B).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220965365.8U CN217872939U (en) | 2022-04-21 | 2022-04-21 | Automatic adjust novel micro-gap vortex gland packing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220965365.8U CN217872939U (en) | 2022-04-21 | 2022-04-21 | Automatic adjust novel micro-gap vortex gland packing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217872939U true CN217872939U (en) | 2022-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220965365.8U Active CN217872939U (en) | 2022-04-21 | 2022-04-21 | Automatic adjust novel micro-gap vortex gland packing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217872939U (en) |
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2022
- 2022-04-21 CN CN202220965365.8U patent/CN217872939U/en active Active
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