CN111911243B - Baffle assembled tip vapor seal structure - Google Patents
Baffle assembled tip vapor seal structure Download PDFInfo
- Publication number
- CN111911243B CN111911243B CN202010854916.9A CN202010854916A CN111911243B CN 111911243 B CN111911243 B CN 111911243B CN 202010854916 A CN202010854916 A CN 202010854916A CN 111911243 B CN111911243 B CN 111911243B
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- China
- Prior art keywords
- impeller
- gap
- gland
- sealing ring
- air flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 210000004907 gland Anatomy 0.000 claims abstract description 59
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 238000005192 partition Methods 0.000 claims abstract description 28
- 238000005452 bending Methods 0.000 claims description 11
- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 101700004678 SLIT3 Proteins 0.000 description 1
- 102100027339 Slit homolog 3 protein Human genes 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to a baffle plate assembled end steam seal structure, which comprises an impeller and a baffle plate adjacent to the impeller; a gap is formed between the partition plate and the impeller; the impeller is provided with a bulge on the wall surface opposite to the partition board, the wall surface opposite to the impeller is provided with a mounting groove, and the bulge is arranged in the mounting groove. Dividing the gap into a first axial gap, a radial gap and a second axial gap; a gland sealing ring is fixedly arranged in the radial gap; the radial gap is blocked by the gland ring; the leaked air flow needs to flow out of the main air flow channel through the first axial gap, the radial gap and the second axial gap in sequence, and after the air flow turns for several times, the kinetic energy is reduced, and the amount of leaked air is reduced; and the gland sealing ring is arranged in the radial gap, so that the problems of sealing failure, abrasion and the like caused by the change of the gland sealing gap due to the axial displacement of the unit rotor are completely avoided, and the reliability of the gland sealing ring is greatly improved.
Description
Technical Field
The invention relates to the technical field of steam seals of steam turbines, in particular to a baffle plate assembly type end steam seal structure.
Background
The partition plate steam seal in the steam turbine is mainly used for reducing steam leakage at the dynamic and static gaps in the steam turbine, so that more steam can complete acting through a runner formed by static and dynamic blade grids, and the running efficiency of the unit is improved.
Through reducing the sealing gap, increase the flow resistance of leaking steam, can reduce the steam leakage volume, but too little sealing gap need improve unit vibration, axial string move's design requirement, has also increased sealed face wearing and tearing and has caused the risk that the steam leakage volume increases simultaneously.
Therefore, the company designs a partition plate assembled end steam seal, and the steam seal ring reduces the steam leakage of the steam seal by changing the flow direction of the steam leakage under the condition that the clearance of the steam seal is unchanged, and meanwhile, the reliability and the service life of the steam seal ring are also improved. By the special structure of the end part, the flowing state of the air flow with the air leakage is improved, and the interference of the air flow with the air leakage on the main flow is reduced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a partition plate assembled end steam seal structure which can reduce the steam leakage of the steam seal, increase the reliability and the service life of a steam seal ring and improve the running efficiency and the economy of a unit.
The technical scheme for solving the technical problems is as follows: a partition plate assembled end steam seal structure comprises an impeller and a partition plate adjacent to the impeller; the impeller is positioned in front of the partition plate along the flowing direction of the main airflow; the primary air flow passes through the partition and the impeller via a primary air flow channel; a gap is formed between the partition plate and the impeller, and leakage air flows out of the main air flow channel through the gap;
the impeller is characterized in that a protrusion is arranged on the wall surface of the impeller, which is opposite to the partition board, a mounting groove is arranged on the wall surface of the partition board, which is opposite to the impeller, the protrusion is arranged in the mounting groove, and the gap is divided into a first axial gap, a radial gap and a second axial gap;
a gland sealing ring is fixedly arranged in the radial gap; the gland ring cuts off the radial gap.
The beneficial effects of the invention are as follows: the leaked air flow needs to flow out of the main air flow channel through the first axial gap, the radial gap and the second axial gap in sequence, and after the air flow turns for several times, the kinetic energy is reduced, and the amount of leaked air is reduced; and the gland sealing ring is arranged in the radial gap, so that the problems of sealing failure, abrasion and the like caused by the change of the gland sealing gap due to the axial displacement of the unit rotor are completely avoided, and the reliability of the gland sealing ring is greatly improved.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the gland ring is an elastic plate of a semicircular ring, and the thickness direction of the gland ring is parallel to the flow direction of the main air flow;
An annular groove is formed in the inner wall of the mounting groove; the outer end of the gland sealing ring is bent 180 degrees to one side of the gland sealing ring to form a bending part, and the bending part is inserted in the annular groove in an interference manner;
the inner end of the gland sealing ring is propped against the side wall of the bulge.
The beneficial effects of adopting the further scheme are as follows: the gland sealing ring is arranged on the partition plate and is a detachable part, and the gland sealing ring and the rotating impeller form a sealing surface; after the seal ring is worn to cause seal failure, only a new seal ring is required to be independently replaced, and the impeller and the partition plate are not required to be repaired, so that the maintenance cost is reduced to a great extent.
Further, the bottom of the annular groove is arc-shaped and is matched with the outer wall of the bending part.
Further, the bending part is internally filled with metal wires in an interference manner.
Further, the inner side of the gland ring is inclined toward the side opposite to the impeller.
Further, the root of the protrusion opposite to the side wall of the radial gap is provided with an arc-shaped chamfer.
The beneficial effects of adopting the further scheme are as follows: the circular arc surface structure increases the flow resistance generated by the impact of the air flow
Further, the other side wall of the protrusion opposite to the radial gap is a special curved surface, the special curved surface is formed by rotating a curve around the center of a main shaft, and the curve is formed by splicing a plurality of sections of arc lines with different curvatures and tangent to each other.
The beneficial effects of adopting the further scheme are as follows: the special curved surface structure avoids the processing difficulty caused by adopting a spline curve with a high order, and can avoid the phenomena of uneven flow, vortex and the like caused by suddenly enlarged flow passage section after the steam seal, improve the flow state of the air flow leaking the steam, and reduce the interference of the air flow to the main flow of the next stage.
Drawings
FIG. 1 is a schematic view of a bulkhead assembled end gland seal according to the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a diagram of the present invention;
Coating 4 is a cross-sectional view at B-B in FIG. 3.
In the drawings, the list of components represented by the various numbers is as follows:
1. baffle, 11, mounting groove, 12, annular groove, 2, impeller, 21, protruding, 22, chamfer, 23, special curved surface, 3, gap, 31, first axial clearance, 32, radial clearance, 33, second axial clearance, 4, gland ring, 41, kink, 5, wire, 6, main air current passageway, 7, main air current, 8, hourglass air current.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1 and 2, a diaphragm-assembled end gland seal structure includes an impeller 2 and a diaphragm 1 adjacent thereto. The impeller 2 is located in front of the partition 1 in the flow direction of the main air flow 7. The main air flow 7 passes through the partition plate 1 and the impeller 2 via the main air flow channel 6. A gap 3 is arranged between the baffle plate 1 and the impeller 2, and the leakage air flow 8 flows out of the main air flow channel 6 through the gap 3.
In order to reduce the leakage air flow 8, more steam is enabled to do work through the main air flow channel 6 so as to improve the running efficiency of the unit, a protrusion 21 is arranged on the wall surface of the impeller 2 opposite to the partition plate 1, and a mounting groove 11 is arranged on the wall surface of the partition plate 1 opposite to the impeller 2. The projection 21 is provided in the mounting groove 11 and divides the slit 3 into a first axial gap 31, a radial gap 32, and a second axial gap 33. The leaked air flow 8 needs to flow out of the main air flow channel 6 through the first axial gap 31, the radial gap 32 and the second axial gap 33 in sequence, and after the leaked air flow 8 turns for several times, the kinetic energy is reduced, and the leaked air flow is reduced.
The root of the projection 21 opposite to the side wall of the radial gap 32 is provided with an arc-shaped chamfer 22, and the arc-shaped structure increases the flow resistance generated by the leakage flow 8 striking the projection 21. The other side wall of the protrusion 21 opposite to the radial gap 32 is a special curved surface 23, the special curved surface 23 is formed by rotating a curve around the center of a main shaft, and the curve is formed by splicing a plurality of sections of arc lines with different curvatures and tangent to each other. The structure of the special curved surface 23 avoids the processing difficulty caused by adopting a spline curve with a high order, and can avoid the phenomena of uneven flow, vortex and the like caused by suddenly enlarged flow passage section of the leaked air flow 8 after steam sealing, improve the flowing state of the leaked air flow 8 and reduce the interference of the leaked air flow 8 to the next stage of main air flow 7.
A gland ring 4 is fixedly arranged in the radial gap 32, and the gland ring 4 cuts off the radial gap 32. Because the gland sealing ring 4 is arranged in the radial gap 32, when the impeller 2 axially moves, the gland sealing ring 4 can still separate the radial gap 32, so that the problems of sealing failure, abrasion and the like caused by changing the gland sealing gap due to axial displacement of a unit rotor are completely avoided, and the reliability of the gland sealing ring is greatly improved.
As shown in fig. 3 and 4, the gland ring 4 is a semicircular elastic plate, and the thickness direction of the gland ring 4 is parallel to the flow direction of the main air flow 7. An annular groove 12 is formed in the inner wall of the mounting groove 11. The outer end of the gland sealing ring 4 is bent 180 degrees to one side of the gland sealing ring to form a bending part 41, and the bending part 41 is inserted in the annular groove 12 in an interference manner. The inner end of the gland ring 4 abuts against the side wall of the boss 21. The gland sealing ring 4 is arranged on the partition board 1 and is a detachable part, so that the replacement is convenient. The gland ring 4 and the rotating impeller 2 form a sealing surface. After the abrasion of the gland sealing ring 4 leads to sealing failure, only the new gland sealing ring 4 needs to be independently replaced, the impeller 2 and the partition plate 1 do not need to be repaired, and the maintenance cost is reduced to a great extent. The gland ring 4 has elasticity, can avoid the hard contact between gland ring 4 and the impeller, slow down the wearing and tearing of gland ring 4, extension gland ring 4's life.
The bottom of the annular groove 12 is arc-shaped and matches with the outer wall of the bending part 41. The bent portion 41 is filled with the wire 5 with interference. The metal wire 5 compresses and fixes the bending part 41 in the annular groove 12, so that the connection between the gland sealing ring 4 and the partition board 1 is firmer, and the disassembly of the gland sealing ring 4 is not affected.
The inside of the gland ring 4 is inclined towards the side opposite the impeller 2. When the leakage air flow 8 hits the gland ring 4, the bulge 21 can prop against the gland ring 4, so that the gland ring 4 is prevented from being deformed, and the leakage air flow 8 passes through the gland ring 4.
The present embodiment reduces the steam leakage of the gland by changing the flow direction of the leakage air flow 8, and increases the reliability and service life of the gland ring 4. By the structure of the special curved surface 23, the flowing state of the leakage air flow 8 is improved, and the interference of the leakage air flow 8 to the next stage main air flow 7 is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A partition plate assembled end steam seal structure comprises an impeller and a partition plate adjacent to the impeller; the impeller is positioned in front of the partition plate along the flowing direction of the main airflow; the primary air flow passes through the partition and the impeller via a primary air flow channel; a gap is formed between the partition plate and the impeller, and leakage air flows out of the main air flow channel through the gap;
the impeller is characterized in that a protrusion is arranged on the wall surface of the impeller, which is opposite to the partition board, a mounting groove is arranged on the wall surface of the partition board, which is opposite to the impeller, the protrusion is arranged in the mounting groove, and the gap is divided into a first axial gap, a radial gap and a second axial gap;
a gland sealing ring is fixedly arranged in the radial gap; the radial gap is blocked by the gland ring;
the gland sealing ring is a semicircular elastic plate, and the thickness direction of the gland sealing ring is parallel to the flow direction of the main air flow;
An annular groove is formed in the inner wall of the mounting groove; the outer end of the gland sealing ring is bent 180 degrees to one side of the gland sealing ring to form a bending part, and the bending part is inserted in the annular groove in an interference manner;
the inner end of the gland sealing ring is propped against the side wall of the bulge;
the bottom of the annular groove is arc-shaped and is matched with the outer wall of the bending part;
The inner side of the gland sealing ring is inclined towards one side opposite to the impeller;
The other side wall of the protrusion opposite to the radial gap is a special curved surface, the special curved surface is formed by rotating a curve around the center of a main shaft, and the curve is formed by splicing a plurality of sections of arc lines with different curvatures and tangent to each other.
2. The bulkhead fitting-type end gland seal of claim 1, wherein the bend is filled with wire with interference.
3. The bulkhead fitting type end gland seal of claim 1, wherein the root of the projection opposite the sidewall of the radial gap is provided with an arcuate chamfer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854916.9A CN111911243B (en) | 2020-08-24 | 2020-08-24 | Baffle assembled tip vapor seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854916.9A CN111911243B (en) | 2020-08-24 | 2020-08-24 | Baffle assembled tip vapor seal structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111911243A CN111911243A (en) | 2020-11-10 |
| CN111911243B true CN111911243B (en) | 2024-05-28 |
Family
ID=73279037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010854916.9A Active CN111911243B (en) | 2020-08-24 | 2020-08-24 | Baffle assembled tip vapor seal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111911243B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201288590Y (en) * | 2008-11-21 | 2009-08-12 | 山东齐鲁电机制造有限公司 | Integration type clapboard radial packing apparatus for steam turbine |
| CN202493296U (en) * | 2012-03-19 | 2012-10-17 | 山东齐鲁电机制造有限公司 | Radial gland seal device of integral type partition plate of turbine |
| CN204851338U (en) * | 2015-07-03 | 2015-12-09 | 华电电力科学研究院 | Motor -driven, quiet leaf root of blade of turbine goes out vapour side leakage loss control structure |
| CN206360730U (en) * | 2016-12-27 | 2017-07-28 | 成都爱迪电力设备有限公司 | A kind of honeycomb steam seal structure |
| CN110307042A (en) * | 2019-07-25 | 2019-10-08 | 东方电气集团东方汽轮机有限公司 | A kind of gland seal structure between the motor-driven static component of rotating type impeller |
| CN212296506U (en) * | 2020-08-24 | 2021-01-05 | 中国长江动力集团有限公司 | Partition board assembled end steam seal structure |
-
2020
- 2020-08-24 CN CN202010854916.9A patent/CN111911243B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201288590Y (en) * | 2008-11-21 | 2009-08-12 | 山东齐鲁电机制造有限公司 | Integration type clapboard radial packing apparatus for steam turbine |
| CN202493296U (en) * | 2012-03-19 | 2012-10-17 | 山东齐鲁电机制造有限公司 | Radial gland seal device of integral type partition plate of turbine |
| CN204851338U (en) * | 2015-07-03 | 2015-12-09 | 华电电力科学研究院 | Motor -driven, quiet leaf root of blade of turbine goes out vapour side leakage loss control structure |
| CN206360730U (en) * | 2016-12-27 | 2017-07-28 | 成都爱迪电力设备有限公司 | A kind of honeycomb steam seal structure |
| CN110307042A (en) * | 2019-07-25 | 2019-10-08 | 东方电气集团东方汽轮机有限公司 | A kind of gland seal structure between the motor-driven static component of rotating type impeller |
| CN212296506U (en) * | 2020-08-24 | 2021-01-05 | 中国长江动力集团有限公司 | Partition board assembled end steam seal structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111911243A (en) | 2020-11-10 |
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