CN214366222U - Steam turbine composite shaft seal body with multi-tooth steam seal structure - Google Patents
Steam turbine composite shaft seal body with multi-tooth steam seal structure Download PDFInfo
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- CN214366222U CN214366222U CN202120443837.9U CN202120443837U CN214366222U CN 214366222 U CN214366222 U CN 214366222U CN 202120443837 U CN202120443837 U CN 202120443837U CN 214366222 U CN214366222 U CN 214366222U
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- 239000002131 composite material Substances 0.000 title claims description 52
- 150000001875 compounds Chemical class 0.000 claims abstract description 15
- 210000004907 gland Anatomy 0.000 claims description 35
- 238000005192 partition Methods 0.000 claims description 8
- LCCNCVORNKJIRZ-UHFFFAOYSA-N parathion Chemical compound CCOP(=S)(OCC)OC1=CC=C([N+]([O-])=O)C=C1 LCCNCVORNKJIRZ-UHFFFAOYSA-N 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 19
- 230000000694 effects Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a compound shaft seal body of steam turbine of multiple tooth type vapor seal structure belongs to steam turbine technical field, the high-pressure rear axle vapor seal has been cup jointed to the left end in the compound shaft seal body outside of steam turbine high-intermediate pressure, the high-pressure leaf top vapor seal that is located high-pressure rear axle vapor seal right side has been cup jointed in the outside of the compound shaft seal body of steam turbine high-intermediate pressure, the high-intermediate pressure leaf top vapor seal that is located high-pressure leaf top vapor seal right side has been cup jointed in the outside of the compound shaft seal body of steam turbine high-intermediate pressure, the high-intermediate pressure vapor seal that is located high-pressure baffle vapor seal right side has been cup jointed in the outside of the compound shaft seal body of steam turbine high-intermediate pressure, the medium-pressure baffle vapor seal that is located medium-pressure leaf top vapor seal right side has been cup jointed in the outside of the compound shaft seal body of steam turbine high-intermediate pressure. The utility model discloses a, possess perfect and improve the structure of traditional vapor seal and the advantage in sealed clearance, solve unit vapor seal gas leakage problem.
Description
Technical Field
The utility model relates to a steam turbine technical field, more specifically say, relate to a compound shaft seal body of steam turbine of multiple tooth type vapor seal structure.
Background
The steam turbine is a high-speed rotating machine, and certain axial and radial gaps are required between static parts such as a cylinder and a partition plate and rotating parts such as a main shaft and blades so as to prevent the static parts and the dynamic parts from colliding and rubbing when the unit works, and a steam sealing device is arranged at the corresponding part of the steam turbine in order to prevent energy loss caused by gap air leakage.
At present, the unit of the dong vapour 300MW steam turbine of victory power plant is because the production is earlier, the vapor seal gas leakage is big, along with the extension of unit operating duration, steam turbine high-pressure and medium-pressure cylinder bearing seal wearing and tearing are serious, and there is the deformation phenomenon in the split surface in the cylinder body, lead to through-flow part baffle, leaf top vapor seal wearing and tearing, the steam leakage quantity has been aggravated, make the thermal performance of steam turbine further descend, low pressure cylinder bearing seal effect is not good, for this reason, the compound shaft seal body of steam turbine who provides a multiple tooth type vapor seal structure solves above-mentioned problem.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
Problem to exist among the prior art, the utility model aims to provide a compound shaft seal body of steam turbine of multiple tooth type vapor seal structure possesses the structure of perfect and improvement traditional vapor seal and the advantage of seal clearance, it is big to have solved unit vapor seal gas leakage, and steam turbine high-pressure and medium-pressure cylinder bearing seal wearing and tearing are serious, and the cylinder body mid-section has the deformation phenomenon, lead to through-flow partial partition board, leaf top vapor seal wearing and tearing, the steam leakage volume has aggravated, thermal behavior further descends, the not good problem of low pressure cylinder bearing seal effect.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
The utility model provides a compound shaft seal body of steam turbine of multiple tooth type vapor seal structure, includes the compound shaft seal body of steam turbine high-intermediate pressure and the compound shaft seal body of steam turbine low pressure, its characterized in that: the high-middle pressure composite shaft seal comprises a steam turbine high-middle pressure composite shaft seal body, a high-pressure rear shaft gland seal, a high-middle pressure leaf top gland seal, a high-middle pressure composite shaft seal, a middle-middle pressure leaf top gland seal, a high-middle pressure composite shaft seal, a high-middle pressure rear shaft gland seal, a high-middle pressure composite shaft gland seal and a high-middle pressure composite shaft seal The high-pressure blade top steam seal, the high-pressure partition plate steam seal, the high-middle steam seal, the middle-pressure blade top steam seal, the middle-pressure partition plate steam seal and the middle-pressure rear shaft steam seal are all in a ring shape, the left end of the outer side of the low-pressure composite shaft seal body of the steam turbine is sleeved with a low-pressure shaft seal, the outer side of the low-pressure composite shaft seal body of the steam turbine is sleeved with the low-pressure blade top steam seal on the right side of the low-pressure shaft seal, the outer side of the low-pressure composite shaft seal body of the steam turbine is sleeved with the low-pressure partition plate steam seal on the right side of the low-pressure blade top steam seal, and the two low-pressure shaft seals are arranged at two ends of the outer side of the low-pressure composite shaft seal body of the steam turbine.
Preferably, the high-pressure rear shaft steam seal and the medium-pressure rear shaft steam seal both adopt staggered tooth steam seals, and the number of the two groups of staggered tooth steam seals is nine circles.
Preferably, the high-pressure blade top steam seal and the medium-pressure blade top steam seal both adopt a city wall tooth and DAS steam seal matching structure.
Preferably, the high-pressure clapboard steam seal and the medium-pressure clapboard steam seal both adopt Bladedon steam seals.
Preferably, the number of the high and middle steam seals is eight, and the high and middle steam seals can adopt a combination mode of seven staggered-tooth steam seals and one anti-rotation steam seal or a combination mode of seven Blatten steam seals and one anti-rotation steam seal.
Preferably, the two low-pressure shaft seals respectively comprise contact steam seals and DAS steam seals, the number of the contact steam seals in the two low-pressure shaft seals is four, and the number of the DAS steam seals in the two low-pressure shaft seals is one.
Preferably, the low-pressure blade tip steam seal adopts staggered tooth steam, and the low-pressure clapboard steam seal adopts DSA steam seal.
3. Advantageous effects
Compared with the prior art, the utility model has the advantages of:
in a high-medium pressure composite shaft seal body of a steam turbine, a high-pressure blade top steam seal and a medium-pressure clapboard steam seal adopt a city wall tooth and DAS steam seal matching structure, so that the loss of blade top gas leakage is reduced, a high-pressure rear shaft steam seal and a medium-pressure rear shaft steam seal both adopt staggered tooth steam seals, the effective tooth number is greatly increased, and the sealing capability is enhanced; the high-pressure baffle plate steam seal and the medium-pressure baffle plate steam seal adopt a Braiden steam seal ring, and are circumferentially closed during working, so that the aim of reducing radial gaps is fulfilled, two low-pressure shaft seals directly influence the vacuum of a unit in a low-pressure composite shaft seal body of the steam turbine, and both the two low-pressure shaft seals comprise contact type steam seals and DAS steam seals, so that the vacuum tightness of the unit is greatly improved, and the low-pressure shaft seals adopt a matching mode of row contact type steam seals and DAS steam seals; DSA steam seal is adopted for the low-pressure clapboard steam seal, the gap is smaller, the sealing performance is better, the structure and the sealing gap of the traditional steam seal are perfected and improved, and the problem of steam leakage of the steam seal of the unit is solved.
Drawings
Fig. 1 is a schematic view of a high-medium pressure steam seal structure of the present invention;
fig. 2 is a schematic view of the low-pressure steam seal structure of the present invention.
The reference numbers in the figures illustrate:
1. a high-medium pressure composite shaft seal body of the steam turbine; 2. a low-pressure composite shaft seal body of the steam turbine; 3. high-pressure rear shaft steam sealing; 4. high-pressure blade top steam sealing; 5. sealing the high-pressure clapboard by steam; 6. high-middle steam sealing; 7. medium pressure leaf top steam sealing; 8. sealing the middle-pressure clapboard by steam; 9. middle-pressure rear shaft steam sealing; 10. a low pressure shaft seal; 11. low-pressure blade top steam sealing; 12. and (5) sealing the low-pressure clapboard by steam.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1-2, a steam turbine composite shaft seal body with a multi-tooth steam seal structure includes a steam turbine high-medium pressure composite shaft seal body 1 and a steam turbine low-pressure composite shaft seal body 2, and is characterized in that: the left end of the outer side of a steam turbine high-medium pressure composite shaft seal body 1 is sleeved with a high-pressure rear shaft gland seal 3, the outer side of the steam turbine high-medium pressure composite shaft seal body 1 is sleeved with a high-pressure blade top gland seal 4 positioned on the right side of the high-pressure rear shaft gland seal 3, the outer side of the steam turbine high-medium pressure composite shaft seal body 1 is sleeved with a high-pressure clapboard gland seal 5 positioned on the right side of the high-pressure blade top gland seal 4, the outer side of the steam turbine high-medium pressure composite shaft seal body 1 is sleeved with a high-middle gland seal 6 positioned on the right side of the high-middle gland seal 5, the outer side of the steam turbine high-medium pressure composite shaft seal body 1 is sleeved with a medium-pressure blade top gland seal 7 positioned on the right side of the medium-pressure blade top gland seal 7, the outer side of the steam turbine high-medium pressure composite shaft seal body 1 is sleeved with a medium-pressure rear shaft gland seal 9 positioned on the right side of the medium-pressure clapboard gland seal 8, the high-pressure rear shaft gland seal 3, the outer side of the steam turbine high-middle pressure composite shaft seal body 1 is sleeved with a high-middle pressure composite shaft seal 4, the high-middle pressure composite shaft seal body 1, the high-middle pressure composite shaft seal body is sleeved with a high-middle pressure steam seal 4, the high-middle pressure steam seal body is connected with a high-middle pressure steam seal body, the high-middle pressure steam seal body is connected with a high pressure steam seal body, the high pressure steam seal body is connected with a high pressure steam seal body, the high pressure steam seal body is connected with a high pressure steam seal body, the high pressure steam seal body is connected with the high pressure steam seal body, the high pressure steam seal body is connected with the high pressure steam seal, The high-pressure blade top steam seal 4, the high-pressure clapboard steam seal 5, the high-middle steam seal 6, the middle-pressure blade top steam seal 7, the middle-pressure clapboard steam seal 8 and the middle-pressure rear shaft steam seal 9 are all in a ring shape, the left end of the outer side of the steam turbine low-pressure composite shaft seal body 2 is sleeved with a low-pressure shaft seal 10, the outer side of the steam turbine low-pressure composite shaft seal body 2 is sleeved with a low-pressure blade top steam seal 11 positioned on the right side of the low-pressure shaft seal 10, the outer side of the steam turbine low-pressure composite shaft seal body 2 is sleeved with a low-pressure clapboard steam seal 12 positioned on the right side of the low-pressure blade top steam seal 11, and the two low-pressure shaft seals 10 are arranged at two ends of the outer side of the steam turbine low-pressure composite shaft seal body 2.
Further, the high-pressure rear shaft steam seal 3 and the medium-pressure rear shaft steam seal 9 both adopt staggered tooth steam seals, and the number of the two groups of staggered tooth steam seals is nine circles.
Furthermore, the high-pressure blade top steam seal 4 and the medium-pressure blade top steam seal 7 both adopt a city wall tooth and DAS steam seal matching structure.
Furthermore, the high-pressure clapboard steam seal 5 and the medium-pressure clapboard steam seal 8 both adopt a Braiden steam seal.
Furthermore, the number of the high and middle steam seals 6 is eight, and the high and middle steam seals 6 can adopt a combination mode of seven staggered-tooth steam seals and one anti-rotation steam seal or a combination mode of seven Braiden steam seals and one anti-rotation steam seal.
Further, both the two low-pressure shaft seals 10 include contact steam seals and DAS steam seals, the number of the contact steam seals included in the two low-pressure shaft seals 10 is four, and the number of the DAS steam seals included in the two low-pressure shaft seals 10 is one.
Further, the low-pressure blade top steam seal 11 adopts staggered tooth steam, and the low-pressure clapboard steam seal 12 adopts DSA steam seal.
In the embodiment 1, the DAS steam seal is provided with a wear-resistant DAS tooth piece for protecting a conventional tooth, the clearance between the steam seal tooth and the surface of a shaft neck is smaller than that of the conventional steam seal tooth during operation, when the steam seal tooth contacts a rotor of a unit, a compression spring is compressed under the action of contact pressure of the rotor to enable a steam seal ring to retreat, so that the conventional steam seal tooth is protected from being worn, the DAS steam seal adopts a back spring assembly type and has the concession capacity, the steam seal clearance is reduced by 0.05-0.1mm compared with other teeth, the rest steam seal teeth can be well protected from being damaged in the start-stop process of the unit, and the leakage amount of the DAS steam seal is about 15% smaller than the total leakage amount of a ferrite labyrinth steam seal and about 5-8% smaller than the total leakage amount of a honeycomb steam seal.
In the embodiment 2, the staggered-tooth steam seal is provided with staggered-tooth inlaying on the steam seal ring and the rotor, and the structure can greatly increase the effective tooth number and enhance the sealing capability; the sealing steam seal is formed by spraying a layer of sealing coating made of special materials on an inner hole of the staggered-tooth steam seal ring, the steam seal gap at the coating is smaller than that of the conventional staggered-tooth steam seal, the coating is wear-resistant and corrosion-resistant, the small gap can be kept for a long time, and in actual engineering, the two steam seals are matched for use, so that a satisfactory sealing effect can be achieved.
In the embodiment 3, the anti-rotation steam seal is formed by adding a row of anti-rotation teeth on the basis of the DAS steam seal, optimizing the number of teeth and the shape through analysis and calculation, and performing reverse flow guiding on air flow passing through the steam seal during working, so that the generation of steam flow shock excitation can be effectively reduced, and the reliability of unit operation is improved.
In embodiment 4, the Brayton vapor seal is circumferentially opened by spring force during installation, and the radial clearance is large; when the steam pressure reaches a design threshold value during working, the steam pressure is circumferentially closed, and the radial clearance is smaller; the large-gap starting is realized to avoid dynamic and static rubbing, and the steam seal always keeps the minimum gap with the rotor during normal work, so that the sealing performance is improved.
Embodiment 5, the contact tooth of contact gland is graphite composite, has wear-resisting and the softer characteristic of texture, passes through contact tooth and rotor contact during the installation to realize the super little clearance of gland seal and do not harm the rotor in operation.
The working principle is as follows: in the high-medium pressure composite shaft seal body 1 of the steam turbine, a high-pressure blade top steam seal 4 and a medium-pressure clapboard steam seal 8 adopt a city wall tooth and DAS steam seal matching structure, so that the loss of blade top gas leakage is reduced, and a high-pressure rear shaft steam seal 3 and a medium-pressure rear shaft steam seal 9 both adopt staggered tooth steam seals, so that the effective tooth number is greatly increased, and the sealing capability is enhanced; the high-pressure baffle plate steam seal 5 and the medium-pressure baffle plate steam seal 8 adopt a Braiden steam seal ring, and are circumferentially closed during working, so that the aim of reducing radial clearance is achieved, in the low-pressure composite shaft seal body 2 of the steam turbine, two low-pressure shaft seals 10 directly influence the vacuum of a unit, and the two low-pressure shaft seals 10 respectively comprise contact steam seals and DAS steam seals, so that the vacuum tightness of the unit is greatly improved, and therefore, the low-pressure shaft seals 10 adopt a 4-row contact steam seal and DAS steam seal matching mode; the low pressure baffle gland seal 12 adopts DSA gland seal, and the clearance is littleer, and the leakproofness is better, perfects and improves the structure and the sealed clearance of traditional gland seal, and it is big to have solved unit gland seal gas leakage, and the high intermediate pressure cylinder bearing seal wearing and tearing of steam turbine are serious, and there is the deformation phenomenon in the cylinder body mid-plane, leads to through-flow part baffle, leaf top gland seal wearing and tearing, has aggravated the steam leakage volume, and thermal behavior further descends, low pressure cylinder shaft seal not good problem of effect.
The above description is only the preferred embodiment of the present invention; the scope of the present invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by replacing or changing the technical solution and the improvement concept of the present invention with equivalents and modifications within the technical scope of the present invention.
Claims (7)
1. The utility model provides a compound shaft seal body of steam turbine of multiple tooth type vapor seal structure, includes the compound shaft seal body of steam turbine high-and-medium pressure (1) and the compound shaft seal body of steam turbine low pressure (2), its characterized in that: the left end of the outer side of the steam turbine high-medium pressure composite shaft seal body (1) is sleeved with a high-pressure rear shaft gland seal (3), the outer side of the steam turbine high-medium pressure composite shaft seal body (1) is sleeved with a high-pressure blade top gland seal (4) positioned on the right side of the high-pressure rear shaft gland seal (3), the outer side of the steam turbine high-medium pressure composite shaft seal body (1) is sleeved with a high-pressure partition plate gland seal (5) positioned on the right side of the high-pressure blade top gland seal (4), the outer side of the steam turbine high-medium pressure composite shaft seal body (1) is sleeved with a high-medium pressure blade top gland seal (6) positioned on the right side of the high-medium pressure partition plate gland seal (5), the outer side of the steam turbine high-medium pressure composite shaft seal body (1) is sleeved with a medium-pressure partition plate gland seal (8) positioned on the right side of the medium-pressure blade top gland seal (7), the outer side of the high-medium pressure composite shaft seal body (1) of the steam turbine is sleeved with a medium-pressure rear shaft gland seal (9) positioned on the right side of a medium-pressure clapboard gland seal (8), the high-pressure rear shaft steam seal (3), the high-pressure blade top steam seal (4), the high-pressure clapboard steam seal (5), the high-middle steam seal (6), the middle-pressure blade top steam seal (7), the middle-pressure clapboard steam seal (8) and the middle-pressure rear shaft steam seal (9) are all in annular shapes, the left end of the outer side of the steam turbine low-pressure composite shaft seal body (2) is sleeved with a low-pressure shaft seal (10), the outer side of the low-pressure composite shaft seal body (2) of the steam turbine is sleeved with a low-pressure blade top steam seal (11) positioned on the right side of a low-pressure shaft seal (10), the outer side of the low-pressure composite shaft seal body (2) of the steam turbine is sleeved with a low-pressure clapboard steam seal (12) positioned on the right side of a low-pressure blade top steam seal (11), the two low-pressure shaft seals (10) are arranged at two ends of the outer side of the low-pressure composite shaft seal body (2) of the steam turbine.
2. The steam turbine composite shaft seal body of the multi-tooth steam seal structure according to claim 1, wherein: the high-pressure rear shaft steam seal (3) and the medium-pressure rear shaft steam seal (9) both adopt staggered tooth steam seals, and the number of the two groups of staggered tooth steam seals is nine circles.
3. The steam turbine composite shaft seal body of the multi-tooth steam seal structure according to claim 1, wherein: and the high-pressure blade top steam seal (4) and the medium-pressure blade top steam seal (7) both adopt a city wall tooth and DAS steam seal matching structure.
4. The steam turbine composite shaft seal body of the multi-tooth steam seal structure according to claim 1, wherein: the high-pressure clapboard steam seal (5) and the medium-pressure clapboard steam seal (8) both adopt Bladen steam seals.
5. The steam turbine composite shaft seal body of the multi-tooth steam seal structure according to claim 1, wherein: the number of the high and middle steam seals (6) is eight, and the high and middle steam seals (6) can adopt a combination mode of seven staggered tooth steam seals and one anti-rotation steam seal or a combination mode of seven Braiden steam seals and one anti-rotation steam seal.
6. The steam turbine composite shaft seal body of the multi-tooth steam seal structure according to claim 1, wherein: the two low-pressure shaft seals (10) respectively comprise contact type steam seals and DAS steam seals, the number of the contact type steam seals in the two low-pressure shaft seals (10) is four, and the number of the DAS steam seals in the two low-pressure shaft seals (10) is one.
7. The steam turbine composite shaft seal body of the multi-tooth steam seal structure according to claim 1, wherein: the low-pressure blade top steam seal (11) adopts staggered tooth steam, and the low-pressure clapboard steam seal (12) adopts DSA steam seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120443837.9U CN214366222U (en) | 2021-03-01 | 2021-03-01 | Steam turbine composite shaft seal body with multi-tooth steam seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120443837.9U CN214366222U (en) | 2021-03-01 | 2021-03-01 | Steam turbine composite shaft seal body with multi-tooth steam seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214366222U true CN214366222U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120443837.9U Expired - Fee Related CN214366222U (en) | 2021-03-01 | 2021-03-01 | Steam turbine composite shaft seal body with multi-tooth steam seal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214366222U (en) |
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2021
- 2021-03-01 CN CN202120443837.9U patent/CN214366222U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211008 |
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| CF01 | Termination of patent right due to non-payment of annual fee |