CN205714294U - Throttling expansion formula intensive tooth packing - Google Patents
Throttling expansion formula intensive tooth packing Download PDFInfo
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- CN205714294U CN205714294U CN201620614806.4U CN201620614806U CN205714294U CN 205714294 U CN205714294 U CN 205714294U CN 201620614806 U CN201620614806 U CN 201620614806U CN 205714294 U CN205714294 U CN 205714294U
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- tooth
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- sealing
- sealing strip
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Abstract
This utility model relates to seal system field, is specifically related to a kind of throttling expansion formula intensive tooth packing.Described throttling expansion formula intensive tooth packing, formed by several sections of labyrinth rings are end to end, described labyrinth ring includes ring body, and the side face that described ring body is relative with rotor is provided with at least two height tooth sealing strip, intensive between two adjacent described high tooth sealing strips is provided with low tooth sealing strip.This utility model compares comparatively dense due to low tooth sealing strip, air-flow is by the repeatedly throttling expansion blood pressure lowering of little chamber, form multistage " effective tooth ", improve the sealing property of packing, and adapt to the axial displacement that rotor occurs in running, ensure the safe operation under less seal clearance of sealing effectiveness, beneficially unit, be particularly suitable for the sealing of large rotor plant equipment particularly steam turbine.
Description
Technical field
This utility model relates to seal system field, is specifically related to a kind of throttling expansion formula intensive tooth packing, is particularly suitable for
The movable sealing of the large rotor plant equipment such as the steam turbine of Turbo-generator Set uses.
Background technology
The feature of " technology-intensive " industry is belonged to, for the prominent lance in enterprise's current development based on thermal power generation corporations
Shield, with theory as foundation, illustrates the problem that Steam Turbine exists, improves the direction of overall performance, implement the technology of comprehensive reformation
Thought, route, method, measure and scheme.Thermal power generation corporations' development exists " high investment, high consumption, maximum discharge, difficulty always
Circulation, inefficient " problem.How transforming and then improving economic performance is that a pendulum reality in face of corporate decision maker is asked
Topic.
Researching and proposing the concept of the through-flow portion of steam turbine " the effective tooth of packing ", packing refers to that difform gland sealing gear is with corresponding
By structure combination at sealing, the main aspect of principal contradiction is that rotating part is sealed the structure at place.For reducing working medium
Leakage rate, Design of Steam Turbine person is the structure and feature according to steam turbine, it is first determined rotor is sealed place's surface texture, then joins
Overlap corresponding gland sealing gear and mounting structure, if turbine rotor can not be transformed by the structure at the place of sealing, only to gland sealing gear
Version be replaced, its effect with use compared with former packing, it is very limited amount of for improving economical.It addition, work as steamer
The construction features of machine and rotating part by the structure of sealing surfaces once it is determined that, the factor size affecting sealing effectiveness is distinguished successively
For: " packing " inlet outlet pressure differential, sealed the structure at place, the number of effective tooth by the packing effective length at sealing, rotating part
Amount, gland blocks design, mounting process, the version of gland sealing gear and assemblage gap etc..
What active service steam turbine influence factor was maximum is quantity and the design of gland blocks structure, the mounting process of effective tooth.Packing
Block transformation or gland sealing gear form are changed, and popular can liken Yi Tiaohe to, and why some section river surface current is the tranquilest, and some
Whirlpool more current in section are bigger.Packing transformation or gland sealing gear form are changed, essence be exactly by every possible means in river passage,
How to deep-cut hole, make more whirlpool, peck more, make bigger wave.Further, since affect steam turbine effect
The economic factors such as rate, coal consumption and the steam consumption are a lot, and wherein the leakage of the through-flow dynamic and static leaf packing of steam turbine and axle envelope is to cause steam turbine
The major reason that efficiency reduces, particularly turbine parameters is more and more higher, under identical seal clearance, by interstage gland steam
Density raises, and mass flow increases.Leakage vapour not only bypasses and likely work done, in dynamic (quiet) leaf, and causes next stage sprue
Melancholy is moved, and double negative effect has a strong impact on stage efficiency.As a example by the unit of vapour 300MW on home-made imported type, at middle gap bridge packing
Leakage rate design load be 20.8 ton hour；The unit of other below 300MW, due to by former technology and production technology
Impact, its leakage rate ratio is the biggest.As can be seen here, the leakage rate of steam turbine is the biggest, and improving potentiality is also very
Big.
The steam seal ring that modern steam turbine is the most the most frequently used is still comb-tooth-type structure, and the work of the steam seal ring of comb-tooth-type structure is former
Reason be approach its pressure that successively decreases forcing a fluid through complications to reduce leakage, when assembling, labyrinth ring is by being placed on packing
The spring pressure at arc block back is tightened to design attitude, and when gland sealing gear and Rub-impact, labyrinth ring has certain yielding, unlikely sternly
Heavily damage axle and labyrinth ring, but friction can not be prevented.In recent years, various new vapour had been introduced from abroad along with the development of technology
Envelope, more typically such as: contact packing, side tooth packing, Honeycomb steam seal etc., but it is bad to still suffer from sealing property, and leakage rate is big,
The deficiencies such as axle easily vibrates, easy damaged.
Utility model content
In order to overcome the weak point of above-mentioned existing steam seal ring, the purpose of this utility model is to provide a kind of sealing property
Get well, adapt to the throttling expansion formula intensive tooth packing of rotor axial displacement, reduce under the premise that security is guaranteed between sealing as far as possible
Gap, increases the damping action of packing, and beneficially unit runs with more stabilizing the economy, and is suitable for large rotor plant equipment particularly vapour
The sealing of turbine.
For realizing above-mentioned technical purpose, the technical scheme that this utility model employing is following:
Throttling expansion formula intensive tooth packing, by several sections (typically by 4 sections or more than 4 sections), labyrinth ring is end to end forms, institute
State labyrinth ring and include ring body, the side face that described ring body is relative with rotor is provided with at least two height tooth sealing strip, adjacent two
Intensive between individual described high tooth sealing strip it is provided with low tooth sealing strip.
As preferably, between two adjacent described high tooth sealing strips, the low tooth sealing strip uniform intervals of intensive setting sets
Put.
As preferably, between two adjacent described low tooth sealing strips, gap vertically is less than 3.5mm.
As further preferably, between two adjacent described low tooth sealing strips, gap vertically is 2.0～3.5mm.
Compared with prior art, this throttling expansion type intensive tooth packing has the following beneficial effect:
Firstly, since low tooth sealing strip compares comparatively dense so that air-flow is by the repeatedly throttling expansion blood pressure lowering of little chamber, and formation is many
Level " effective tooth ", when mill collided by steam seal ring and rotor, effective tooth is more thus abrasion of to rotor is less, to packing body also
Play effective protective effect, this ensure that unit safe operation under small-gap suture；
Secondly as low tooth sealing strip is intensive more, makes to flow uniformly in the intensive tooth of entrance and just become uneven, and
And from intensive tooth region to areas at both sides bias current, these bias currents gradually form concurrent and jet in labyrinth casing, and produce with
The Secondary Flow of machine and bumpy flow, and when a jet runs into more effective tooth above, the direction of motion will be changed and become with main
The horizontal mobility that flow path direction is vertical, the most laterally flows, and the just horizontal stream owing to producing can make fluid create self sealss effect, its energy
Make the overall presure drop flowing transversely through effective tooth increase thus reduce leakage further.
Furthermore, owing to low tooth sealing strip is intensive more, effectively prevent owing to turbine rotor can go out in running
Existing axial float and cause the problem of the sealing effectiveness difference that part low tooth deviation rotor boss causes, improve the economic effect of unit
Benefit.
Accompanying drawing explanation
The following drawings is only intended to, in schematically illustrating this utility model and explaining, not limit model of the present utility model
Enclose.Wherein:
Fig. 1 is the cross section structure schematic diagram of labyrinth ring in this utility model embodiment one；
Fig. 2 is the cross section structure schematic diagram of labyrinth ring in this utility model embodiment two；
Fig. 3 is the cross section structure schematic diagram of labyrinth ring in this utility model embodiment three.
In figure: 1-ring body；2-height tooth sealing strip；3-low tooth sealing strip.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, this utility model is expanded on further.In the following detailed description, only by saying
Bright mode describes some one exemplary embodiment of the present utility model.Undoubtedly, those of ordinary skill in the art is permissible
Recognize, in the case of without departing from spirit and scope of the present utility model, can be by various different modes to described
Embodiment is modified.Therefore, accompanying drawing and description are inherently protection that is the most illustrative rather than that be used for limiting claim
Scope.
Embodiment 1
As it is shown in figure 1, throttling expansion formula intensive tooth packing, by several sections of (generally 4 sections or more multistage) labyrinth ring head and the tail phases
Connecing composition, the arc segment structure of labyrinth ring is essentially identical with tradition packing segmental arc, and described labyrinth ring includes ring body 1, described ring body 1 with
It is provided with at least two height tooth sealing strip 2 on the side face that rotor is relative, the present embodiment is introduced as a example by two, adjacent
Intensive between two described high tooth sealing strips 2 it is provided with multiple low tooth sealing strip 3, forms intensive tooth group, each intensive tooth group
The quantity of low tooth sealing strip 3 can be appropriately arranged with by the structure at the place of sealing according to the broadband of ring body and rotor, general each intensive
The low tooth sealing strip of tooth group is more than at least 5.
Convenient for machining, between two adjacent described high tooth sealing strips 2, the low tooth sealing strip 3 of intensive setting is best
Uniform intervals is arranged.Reduce seal clearance the most as far as possible, increase the damping action of packing, adjacent two
Between described low tooth sealing strip, gap vertically is preferably no more than 3.5mm, in the case of processing conditions allows, adjacent two
Between described low tooth sealing strip, gap vertically could be arranged to 2.0mm or more small-gap suture.
Owing to low tooth sealing strip 3 compares comparatively dense so that air-flow, by the repeatedly throttling expansion blood pressure lowering of little chamber, is formed multistage
" effective tooth ", when mill collided by steam seal ring and rotor, effective tooth is more thus abrasion of to rotor is less, also plays packing body
To effective protective effect, this ensure that unit safe operation under small-gap suture；Simultaneously because low tooth sealing strip is intensive more,
Make to flow uniformly in the intensive tooth of entrance and just become uneven, and from intensive tooth region to areas at both sides bias current, these are inclined
Stream gradually forms concurrent and jet in labyrinth casing, and produces random Secondary Flow and bumpy flow, and before a jet runs into
More effective tooth in face, will change the direction of motion and become the horizontal mobility vertical with main flow direction, the most laterally flow, just due to
The horizontal stream produced can make fluid create self sealss effect, and it can make the overall presure drop flowing transversely through effective tooth increase thus enter one
Step reduces leakage.Further, since low tooth sealing strip is intensive more, effectively prevent due to turbine rotor meeting in running
Occur axial float and cause part low tooth deviation rotor boss cause sealing effectiveness difference problem.
Embodiment 2
With reference to Fig. 2, the present embodiment is essentially identical with the structural principle of embodiment 1, and it is uniquely distinguished and is: described ring body 1
Three high tooth sealing strips 2, intensive setting between two adjacent described high tooth sealing strips 2 it is provided with on the side face relative with rotor
Having multiple low tooth sealing strip 3, between two adjacent described low tooth sealing strips 3, gap vertically is about 2.5mm.
Embodiment 3
With reference to Fig. 3, the present embodiment is essentially identical with the structural principle of embodiment 1, and it is uniquely distinguished and is: described ring body 1
Four high tooth sealing strips 2, intensive setting between two adjacent described high tooth sealing strips 2 it is provided with on the side face relative with rotor
Having multiple low tooth sealing strip 3, between two adjacent described low tooth sealing strips 3, gap vertically is about 2.0mm.
It is demonstrated experimentally that the steam loss of this intensive tooth packing is only the 20%～30% of former serrate-type steam seal, there is sealing
The advantages such as energy is good and simple and reasonable, can be suitable for large rotor plant equipment and make movable sealing use, be particularly suitable for existing vapour
The movable sealing of turbine is replaced upgrading and uses.
The foregoing is only the schematic detailed description of the invention of this utility model, be not limited to model of the present utility model
Enclose.Any those skilled in the art, equivalent done on the premise of without departing from design of the present utility model and principle becomes
Change and amendment, the scope of this utility model protection all should be belonged to.
Claims (4)
1. the intensive tooth packing of throttling expansion formula, is formed by several sections of labyrinth rings are end to end, and described labyrinth ring includes ring body (1), its
It is characterised by: on the side face that described ring body (1) is relative with rotor, be provided with at least two height tooth sealing strip (2), adjacent two
Intensive between described high tooth sealing strip (2) it is provided with low tooth sealing strip (3).
2. throttling expansion formula intensive tooth packing as claimed in claim 1, it is characterised in that: two adjacent described high teeth seal
Low tooth sealing strip (3) uniform intervals of intensive setting between bar (2) is arranged.
3. throttling expansion formula intensive tooth packing as claimed in claim 2, it is characterised in that: two adjacent described low teeth seal
Between bar (2), gap vertically is less than 3.5mm.
4. throttling expansion formula intensive tooth packing as claimed in claim 3, it is characterised in that: two adjacent described low teeth seal
Between bar (2), gap vertically is 2.0～3.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620614806.4U CN205714294U (en) | 2016-06-21 | 2016-06-21 | Throttling expansion formula intensive tooth packing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620614806.4U CN205714294U (en) | 2016-06-21 | 2016-06-21 | Throttling expansion formula intensive tooth packing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205714294U true CN205714294U (en) | 2016-11-23 |
Family
ID=57316589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620614806.4U Active CN205714294U (en) | 2016-06-21 | 2016-06-21 | Throttling expansion formula intensive tooth packing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205714294U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927291A (en) * | 2016-06-21 | 2016-09-07 | 周惠 | Throttling expansion type dense-tooth steam seal |
-
2016
- 2016-06-21 CN CN201620614806.4U patent/CN205714294U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927291A (en) * | 2016-06-21 | 2016-09-07 | 周惠 | Throttling expansion type dense-tooth steam seal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190419 Address after: 210000 two, B unit 300, Zhihui Road, Qilin science and Technology Innovation Park, Nanjing, Jiangsu. Patentee after: NANJING CHONON ENERGY-SAVING TECHNOLOGY CO., LTD. Address before: Room 208, Building 2, No. 1 Wenbo Road, Jiangning District, Nanjing City, Jiangsu Province Patentee before: Zhou Hui |