CN204511527U - A kind of combined type can make a concession formula steam turbine low-pressure blade tip seal structure - Google Patents
A kind of combined type can make a concession formula steam turbine low-pressure blade tip seal structure Download PDFInfo
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- CN204511527U CN204511527U CN201520181977.8U CN201520181977U CN204511527U CN 204511527 U CN204511527 U CN 204511527U CN 201520181977 U CN201520181977 U CN 201520181977U CN 204511527 U CN204511527 U CN 204511527U
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- combined type
- concession
- blade tip
- formula steam
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- 238000012856 packing Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 238000010977 unit operation Methods 0.000 description 12
- 210000004907 gland Anatomy 0.000 description 11
- 238000013461 design Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
A kind of combined type can make a concession formula steam turbine low-pressure blade tip seal structure, comprise diaphragm housing ring, dividing plate outer shroud, blade tip seal body, combined type can make a concession formula steam seal ring, leaf top girth band, cylindrical spring, logical vapour groove, clamping bolt, jacking screw, it is characterized in that: at dividing plate outer shroud, blade tip seal body is installed, processing vapor sealing groove on blade tip seal body, combined type is installed in packing groove and can makes a concession formula steam seal ring, combined type can be made a concession formula steam seal ring and have employed the composite structure that comb height tooth combines with the low tooth of honeycomb, its back is processed with spring eye, in spring eye, cylindrical spring is installed, combined type can be made a concession the leaf top girth band that formula steam seal ring presses to rotor by cylindrical spring.
Description
Technical field
The utility model directly applies in the low pressure blade tip seal transformation project of certain model steam turbine that certain manufactory produces, and to reduce its low pressure tip clearance loss, improves low pressure (LP) cylinder efficiency.
Background technique
Certain model steam turbine that certain manufactory domestic produces, its low pressure (LP) cylinder send out that power accounts for complete machine power fraction about 35%, the height of low pressure (LP) cylinder Economy has material impact to complete machine Economy, and affects the size that one of key factor of low pressure (LP) cylinder Economy is tip clearance loss.The intrinsic low pressure blade tip seal of this model steam turbine, for blade tip seal body and dividing plate outer shroud to be cast as one, this labyrinth casing is inlayed comb resistance vapour chip gland seal structure.This kind of gland seal structure can not be made a concession when unit operation, and safety hazards occurs easily to cause impact and rub, unit vibration large etc. at Unit Commitment machine and when crossing critical.In order to improve the Security of unit operation, manufactory is generally designed to higher value when designing by packing radial clearance, power plant also adjusts by the upper limit of this radial clearance design load when Steam Turbine Field is debugged, but because this kind of gland seal structure can not be made a concession when unit operation, its comb resistance vapour sheet inevitably also exists abrasion condition when unit operation, causes packing radial clearance to increase further.In addition because the comb stage teeth of this kind of gland seal structure need be corresponding with the high low platform of leaf top girth band, in order to meet unit axial differential expansion safety requirement, determining the high tooth of this kind of gland seal structure and low tooth limited amount, in unit running process, easily occurring falling tooth phenomenon.These combined factors cause this kind of gland seal structure steam leakage serious, and low pressure (LP) cylinder efficiency is low, and causes certain potential safety hazard to unit operation.
Summary of the invention
For reducing this type steam turbine low-pressure blade tip seal leakage losses, improving low pressure (LP) cylinder efficiency, and increasing the safety reliability of unit operation, transforming its low pressure blade tip seal as combined type and can make a concession formula gland seal structure.
The utility model solves the technological scheme that its technical problem adopts: a kind of combined type can make a concession formula steam turbine low-pressure blade tip seal structure, comprise diaphragm housing ring, dividing plate outer shroud, blade tip seal body, combined type can make a concession formula steam seal ring, leaf top girth band, cylindrical spring, logical vapour groove, clamping bolt, jacking screw, specific operation install blade tip seal body at dividing plate outer shroud, with 48 clamping bolts by blade tip seal body tightly on dividing plate outer shroud.Article 48, clamping bolt can ensure blade tip seal body uniform force, plays effective fixation.Processing vapor sealing groove on blade tip seal body, combined type is installed in packing groove and can makes a concession formula steam seal ring, this combined type can make a concession the composite structure that formula steam seal ring adopts comb height tooth to combine with the low tooth of honeycomb, combined type can be made a concession formula steam seal ring back and be processed with spring eye, be provided with cylindrical spring in spring eye, combined type can be made a concession the leaf top girth band that formula steam seal ring presses to rotor by cylindrical spring.This kind of structure improves the Economy of unit operation under the prerequisite ensureing unit safety operation.Every grade of combined type can be made a concession formula steam seal ring and be divided into 12 segmental arcs, facilitates this combined type can make a concession in-site installation and the adjustment of formula steam seal ring, and every segmental arc steam seal ring back of the body arc is processed with 2 jacking screw holes and 8 spring eyes.Jacking screw is arranged in jacking screw hole, when major overhaul adjustment combined type can make a concession formula steam seal ring radial clearance, jacking screw is screwed out from jacking screw hole, is pressed in packing groove combined type can be made a concession formula steam seal ring, make the adjustment of its radial clearance more convenient and accurate.Can make a concession formula steam seal ring radial clearance when combined type adjusts complete, is screwed to by jacking screw in jacking screw hole, and punching jail of riveting tightly; In each spring eye, a cylindrical spring is installed, combined type can be made a concession when unit operation the leaf top girth band that formula steam seal ring presses to rotor by it, ensure that its radial clearance is in less scope, when the leaf top girth band that combined type can make a concession formula steam seal ring and rotor collides, cylindrical spring shrinks, make combined type can make a concession the leaf top girth band of formula steam seal ring away from rotor, damage is not produced to rotor.The steam admission side can making a concession formula steam seal ring at every segmental arc combined type is designed with 1 logical vapour groove, flows into for steam admission side steam the back that combined type can make a concession formula steam seal ring.
The beneficial effects of the utility model are, combined type can make a concession the design of formula gland seal structure, and steam seal ring have employed the composite structure that comb height tooth combines with the low tooth of honeycomb, improve the Economy of unit operation under the prerequisite ensureing unit safety operation; Article 48, clamping bolt can ensure blade tip seal body uniform force, plays effective fixation; The design of jacking screw, makes combined type can make a concession the adjustment of formula steam seal ring radial clearance more convenient and accurate; The design of cylindrical spring structure, unit operationally can be ensured, and the radial clearance between the leaf top girth band that combined type can make a concession formula steam seal ring and rotor is smaller value, can avoid the situation such as unit vibration increases, the increase of the packing radial clearance generation because impact and rub causes simultaneously.This can make a concession formula gland seal structure can reduce tip clearance loss, improves low pressure (LP) cylinder efficiency, and improves the safety reliability of unit operation.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the utility model assembling schematic diagram.
Fig. 2 is the layout schematic diagram that the utility model one segmental arc combined type can make a concession spring eye in formula steam seal ring, jacking screw hole and logical vapour groove, and arrow direction is steam flow direction.
1. dividing plate outer shroud, 2. diaphragm housing rings in figure, 3. combined type can make a concession formula steam seal ring, 4. leaf top girth band, 5. cylindrical spring, 6. blade tip seal body, 7. clamping bolt, 8. jacking screw hole, 9. spring eye, 10. logical vapour groove, 11. inlay seam, 12. comb height teeth, the low tooth of 13. honeycomb.
Embodiment
Utilize lathe can make a concession formula steam seal ring to layout design size according to design drawing processing combined type, prepare blade tip seal body forging, portion size needs made allowance simultaneously.After power plant shuts down; first carry out the measurement of transforming level leaf top girth band relative dimensions, then transport transformation level dividing plate back job shop, dividing plate outer shroud prophyll top labyrinth casing car is removed; process young leaves top labyrinth casing in the relevant position of dividing plate outer shroud and inlay seam, young leaves top labyrinth casing is embedded and inlays in seam.Young leaves top labyrinth casing comparatively prophyll top labyrinth casing increases to some extent on radial thickness, to facilitate processing vapor sealing groove thereon.With 48 clamping bolts by young leaves top labyrinth casing tight on dividing plate outer shroud.According to related measurement data processing vapor sealing groove on the labyrinth casing of young leaves top.At power plant Overhaul site, combined type is installed and can makes a concession formula steam seal ring, and adjust combined type and can make a concession formula steam seal ring radial clearance to design load.
In the embodiment shown in fig. 1, the prophyll top labyrinth casing car be embedded on the inner dividing plate outer shroud (1) of diaphragm housing ring (2) is removed, and inlay seam (11) in the steam output side position of dividing plate outer shroud (1) processing young leaves top labyrinth casing (6), blade tip seal body (6) by clamping bolt (7) tight on dividing plate outer shroud (1).At the upper processing vapor sealing groove of blade tip seal body (6), install combined type at power plant's Overhaul site and can make a concession formula steam seal ring (3), combined type can be made a concession formula steam seal ring (3) and is installed in packing groove by cylindrical spring (5).Combined type can be made a concession between the comb height tooth (12) of formula steam seal ring (3) and the low tooth of honeycomb (13) and leaf top girth band (4) and form sealing configuration.
In the embodiment depicted in figure 2, the back of the body arc that every segmental arc combined type can make a concession formula steam seal ring (3) is all processed with 8 spring eyes (9) and 2 jacking screw holes (8), jacking screw screws out when can make a concession the radial clearance of formula steam seal ring (3) by Overhaul site adjustment combined type in jacking screw hole (8), combined type can be made a concession formula steam seal ring (3) is pressed in packing groove, and repair combined type can make a concession the radial clearance A of formula steam seal ring (3) and leaf top girth band (4) and B to design load.The radial clearance adjustment that combined type can make a concession formula steam seal ring (3) is complete, by jacking screw cycle to jacking screw hole (8) and punching jail of riveting tightly; Then cylindrical spring (5) is installed in spring eye (9).Logical vapour groove (10) can make a concession the steam admission side direction of formula steam seal ring (3) at combined type.
Specifically, this combined type can be made a concession formula gland seal structure and be optimized design to former comb gland seal structure, steam seal ring have employed the composite structure that comb height tooth combines with the low tooth of honeycomb, to blade tip seal body and and the mounting type of dividing plate outer shroud carried out appropriate design, devise this combined type simultaneously and can make a concession formula packing adjustment mode, the Economy improving unit operation under the prerequisite improving unit operation Security can be ensured.
Claims (5)
1. a combined type can make a concession formula steam turbine low-pressure blade tip seal structure, comprise diaphragm housing ring, dividing plate outer shroud, blade tip seal body, combined type can make a concession formula steam seal ring, leaf top girth band, cylindrical spring, logical vapour groove, clamping bolt, jacking screw, it is characterized in that: at dividing plate outer shroud, blade tip seal body is installed, processing vapor sealing groove on blade tip seal body, combined type is installed in packing groove and can makes a concession formula steam seal ring, combined type can be made a concession formula steam seal ring and have employed the composite structure that comb height tooth combines with the low tooth of honeycomb, its back is processed with spring eye, in spring eye, cylindrical spring is installed, combined type can be made a concession the leaf top girth band that formula steam seal ring presses to rotor by cylindrical spring.
2. combined type according to claim 1 can make a concession formula steam turbine low-pressure blade tip seal structure, it is characterized in that: with 48 clamping bolts by blade tip seal body tight on dividing plate outer shroud.
3. combined type according to claim 1 can make a concession formula steam turbine low-pressure blade tip seal structure, it is characterized in that: every grade of combined type can be made a concession formula steam seal ring and be divided into 12 segmental arcs.
4. combined type according to claim 3 can make a concession formula steam turbine low-pressure blade tip seal structure, it is characterized in that: the back of the body arc that described combined type can make a concession every segmental arc of formula steam seal ring is processed with 2 jacking screw holes and 8 spring eyes.
5. combined type according to claim 4 can make a concession formula steam turbine low-pressure blade tip seal structure, it is characterized in that: jacking screw is arranged in jacking screw hole, and cylindrical spring is arranged in cylindrical spring hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520181977.8U CN204511527U (en) | 2015-03-30 | 2015-03-30 | A kind of combined type can make a concession formula steam turbine low-pressure blade tip seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520181977.8U CN204511527U (en) | 2015-03-30 | 2015-03-30 | A kind of combined type can make a concession formula steam turbine low-pressure blade tip seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204511527U true CN204511527U (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520181977.8U Expired - Fee Related CN204511527U (en) | 2015-03-30 | 2015-03-30 | A kind of combined type can make a concession formula steam turbine low-pressure blade tip seal structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927292A (en) * | 2016-06-02 | 2016-09-07 | 东方电气集团东方汽轮机有限公司 | Steam seal pressure plate structure with sealing key function |
-
2015
- 2015-03-30 CN CN201520181977.8U patent/CN204511527U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927292A (en) * | 2016-06-02 | 2016-09-07 | 东方电气集团东方汽轮机有限公司 | Steam seal pressure plate structure with sealing key function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100044 18th floor, Fangyuan building, No.56, Zhongguancun South Street, Haidian District, Beijing Patentee after: Beijing Guoneng Longwei Power Generation Technology Co.,Ltd. Address before: 100044 18th floor, Fangyuan building, No.56, Zhongguancun South Street, Haidian District, Beijing Patentee before: BEIJING LONGWEI POWER GENERATION TECHNOLOGY Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 |