CN203669938U - Tilting labyrinth vapor seal steam turbine - Google Patents
Tilting labyrinth vapor seal steam turbine Download PDFInfo
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- CN203669938U CN203669938U CN201420025215.4U CN201420025215U CN203669938U CN 203669938 U CN203669938 U CN 203669938U CN 201420025215 U CN201420025215 U CN 201420025215U CN 203669938 U CN203669938 U CN 203669938U
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- tilting
- labyrinth
- gland
- steam turbine
- rotor
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Abstract
The utility model relates to a tilting labyrinth vapor seal steam turbine which comprises a shell, a rotor arranged in the shell and a steam seal sleeve, wherein the axis of the rotor and the axis of the vapor seal sleeve are on the same axis, multiple protrusions with slopes are arranged on the side, opposite to the steam seal sleeve, of the rotor, the steam seal sleeve is provided with sealing plates matched with the protrusions in a tilting mode, and gaps are formed between the sealing plates and the slopes of the protrusions matched with the sealing plates. The tilting labyrinth vapor seal steam turbine has the advantages that the leakage quantity of steam can be substantially reduced, economical efficiency of a unit is improved.
Description
Technical field
The utility model relates to the technical field of automobile, refers more particularly to a kind of tilting labyrinth gland steam turbine.
Background technique
When the running of tilting labyrinth gland steam turbine, for ensureing the safe operation of unit, rotating part and stationary part leave suitable gap, and this gap can cause steam leakage, and for reducing to leak, tilting labyrinth gland steam turbine need adopt sealing gland.As shown in Figure 1, large at present, in, compact tilt formula labyrinth gland steam turbine extensively adopts labyrinth gland, and the labyrinth casing being arranged on cylinder by gland sleeve matches with epitrochanterian boss, forms multiple annular steam chests, by adiabatic throttling repeatedly, vapor pressure is reduced, reduce steam leakage.But because effective leakage vapour area of traditional labyrinth gland is large, cause Steam loss large, sealing effect is not good.
Model utility content
The purpose of this utility model is to provide a kind of tilting labyrinth gland steam turbine, to solve the above-mentioned deficiency of prior art.
The purpose of this utility model is to be achieved through the following technical solutions:
The utility model provides a kind of tilting labyrinth gland steam turbine, this tilting labyrinth gland steam turbine comprises housing, be arranged at rotor and the gland sleeve in described housing that be arranged in housing, wherein, the axis of described rotor and the axis of described stuffing box gland are positioned at same axis, and the one side that described rotor is relative with described gland sleeve is provided with the sloping projection of multiple tools, described gland sleeve is tilting the sealing plate matching with each projection, and described sealing plate has gap with between the protruding slope of matching.
Preferably, also comprise the reeded labyrinth casing of the tool being arranged in described housing, described gland sleeve is arranged in described groove and is connected by elastic component with described labyrinth casing.
Preferably, the slope of described projection and the angle of horizontal plane are 45 °.
Preferably, described sealing plate is 45 ° with the angle of horizontal plane, and described slope and described sealing plate true dip direction orthogonal.
The beneficial effects of the utility model are: the leakage rate of minimizing steam that can be larger, the Economy of raising unit.
Brief description of the drawings
With reference to the accompanying drawings the utility model is described in further detail below.
Fig. 1 is the structural representation of tilting labyrinth gland steam turbine of the prior art;
Fig. 2 is the structural representation of the tilting labyrinth gland steam turbine that provides of the utility model embodiment.
In figure:
1, labyrinth casing; 2, gland sleeve; 3, rotor; 4, projection; 5, sealing plate.
Embodiment
As shown in Figure 2, a kind of tilting labyrinth gland steam turbine described in the utility model embodiment, this tilting labyrinth gland steam turbine comprises housing, be arranged at rotor 3 and the gland sleeve 2 in described housing that be arranged in housing, wherein, the axis of described rotor 3 and the axis of described stuffing box gland are positioned at same axis, and the one side that described rotor 3 is relative with described gland sleeve 2 is provided with multiple tools sloping protruding 4, described gland sleeve 2 is tilting to be had and each protruding 4 sealing plates that match 5, and has gap between the slope of described sealing plate 5 and the projection 4 matching.
Preferably, also comprise the reeded labyrinth casing 1 of the tool being arranged in described housing, described gland sleeve 2 is arranged in described groove and is connected by elastic component with described labyrinth casing 1.The angle of wherein said protruding 4 slope and horizontal plane is 45 °.And described sealing plate 5 is 45 ° with the angle of horizontal plane, and the true dip direction of described slope and described sealing plate 5 is orthogonal.
Concrete, the utility model proposes a kind of tilting packing, straight-tooth is transformed into helical teeth, make effectively to leak vapour area and reduce, increase the frictional damping effect to vapor stream, reduce the leakage rate of steam.
1) flow velocity at last shaft seal aperture place is when reaching critical velocity, the formula of Steam loss:
2) flow velocity at last shaft seal aperture place reaches critical velocity, the formula of Steam loss
Wherein:
A
lfor effectively leaking vapour area in shaft seal aperture; μ
lfor leaking steam flow flow coefficient in shaft seal aperture; P
0for steam inlet pressure; ρ
0inlet steam density; P
zoutlet vapor pressure; The Z packing number of teeth.
In use, rotor 3 and stator, because be heated or vibration can cause that radial deformation is inconsistent, for avoiding labyrinth strip and main shaft to rub, cause local pyrexia or distortion, the certain radial clearance δ of necessary reservation.Compared with prior art, effective gas leakage area of labyrinth gland of the prior art is:
A
L＝πdδ (2)
And tilting labyrinth gland in the tilting labyrinth gland steam turbine providing for the present embodiment, owing to having tilted certain angle θ, makes effectively to leak vapour area and is reduced to:
A
L＝πdδcosθ (1)
Wherein d is the average diameter of shaft seal section place rotor 3.
Comparison type (1) and formula (2), effective gas leakage area of the tilting labyrinth gland that discovery the present embodiment provides is less, and Gas leak flow coefficient is also less, makes the sealing effect of tilting labyrinth gland better.
Concrete, describe taking tilt angle as the tilting packing of 45 degree as example.Front and back pressure, temperature and the number of teeth of the shaft seal section of two kinds of packings, radial clearance, gland sealing gear are all identical, wherein radial clearance δ=0.4mm.
Example 1:P
0=3.99Mp, ρ
0=12.50373kg/m
3, P
z=3.502Mp, T
0=449.2 DEG C, Z=8;
Example 2:P
0=0.838Mp, ρ
0=3.328kg/m
3, P
z=0.1245Mp, T
0=285.5 DEG C, Z=8;
Utilize numerical simulation software Fluent6.2 to calculate, draw following result.
The Steam loss result of calculation contrast of table 1 stage teeth shaft seal and tilting shaft seal
By the result of numerical simulation, can draw: tilting labyrinth gland is compared traditional type labyrinth gland, the effect of sealing is greatly improved, and the relative reduction of gas leakage is more than 25%.
Can find out that by foregoing description the utility model is by reducing to leak vapour area and leak steam flow flow coefficient to realize the minimizing of Steam loss.This design has solid theoretical foundation and experiment basis, can significantly improve the sealing effect of packing, and then improves unit efficiency.The labyrinth gland that is 45 ° by tilt angle is applied to Shanghai tilting labyrinth gland steam turbine plant N300-16.67/538/538 unit, can reduce coal consumption 0.2g.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but do any variation in its shape or structure; every have identical with a application or akin technological scheme, within all dropping on protection domain of the present utility model.
Claims (4)
1. a tilting labyrinth gland steam turbine, it is characterized in that, comprise housing, be arranged at rotor and the gland sleeve in described housing that be arranged in housing, wherein, the axis of described rotor and the axis of described stuffing box gland are positioned at same axis, and the described rotor one side relative with described gland sleeve is provided with the sloping projection of multiple tools, described gland sleeve is tilting the sealing plate matching with each projection, and described sealing plate has gap with between the protruding slope of matching.
2. tilting labyrinth gland steam turbine according to claim 1, is characterized in that, also comprises the reeded labyrinth casing of the tool being arranged in described housing, and described gland sleeve is arranged in described groove and is connected by elastic component with described labyrinth casing.
3. tilting labyrinth gland steam turbine according to claim 1, is characterized in that, the slope of described projection and the angle of horizontal plane are 45 °.
4. tilting labyrinth gland steam turbine according to claim 4, is characterized in that, described sealing plate is 45 ° with the angle of horizontal plane, and described slope and described sealing plate true dip direction orthogonal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420025215.4U CN203669938U (en) | 2014-01-16 | 2014-01-16 | Tilting labyrinth vapor seal steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420025215.4U CN203669938U (en) | 2014-01-16 | 2014-01-16 | Tilting labyrinth vapor seal steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203669938U true CN203669938U (en) | 2014-06-25 |
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ID=50966248
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|---|---|---|---|
| CN201420025215.4U Expired - Fee Related CN203669938U (en) | 2014-01-16 | 2014-01-16 | Tilting labyrinth vapor seal steam turbine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134954A (en) * | 2015-09-14 | 2015-12-09 | 沈阳航空航天大学 | Novel hole type sealing structure capable of improving sealing characteristic and damping characteristic |
| CN105156680A (en) * | 2015-09-14 | 2015-12-16 | 沈阳航空航天大学 | Novel honeycomb seal structure capable of enhancing sealing characteristic and damping characteristic |
| CN106194278A (en) * | 2016-07-29 | 2016-12-07 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of gas-turbine unit densification device |
| CN108603603A (en) * | 2016-02-16 | 2018-09-28 | 三菱日立电力系统株式会社 | Sealing device and rotating machinery |
| CN113685234A (en) * | 2021-08-31 | 2021-11-23 | 北京航空航天大学 | Labyrinth sealing device based on hedging principle |
| CN114483210A (en) * | 2021-12-27 | 2022-05-13 | 东方电气集团东方汽轮机有限公司 | Steam seal structure between dynamic and static parts of radial flow turbine |
-
2014
- 2014-01-16 CN CN201420025215.4U patent/CN203669938U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134954A (en) * | 2015-09-14 | 2015-12-09 | 沈阳航空航天大学 | Novel hole type sealing structure capable of improving sealing characteristic and damping characteristic |
| CN105156680A (en) * | 2015-09-14 | 2015-12-16 | 沈阳航空航天大学 | Novel honeycomb seal structure capable of enhancing sealing characteristic and damping characteristic |
| CN108603603A (en) * | 2016-02-16 | 2018-09-28 | 三菱日立电力系统株式会社 | Sealing device and rotating machinery |
| US11319825B2 (en) | 2016-02-16 | 2022-05-03 | Mitsubishi Power, Ltd. | Sealing device and rotary machine |
| CN106194278A (en) * | 2016-07-29 | 2016-12-07 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of gas-turbine unit densification device |
| CN106194278B (en) * | 2016-07-29 | 2018-10-09 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of gas-turbine unit densification device |
| CN113685234A (en) * | 2021-08-31 | 2021-11-23 | 北京航空航天大学 | Labyrinth sealing device based on hedging principle |
| CN113685234B (en) * | 2021-08-31 | 2022-08-09 | 北京航空航天大学 | Labyrinth sealing device based on hedging principle |
| CN114483210A (en) * | 2021-12-27 | 2022-05-13 | 东方电气集团东方汽轮机有限公司 | Steam seal structure between dynamic and static parts of radial flow turbine |
| CN114483210B (en) * | 2021-12-27 | 2024-02-13 | 东方电气集团东方汽轮机有限公司 | Steam seal structure between dynamic and static parts of radial turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20150116 |
|
| EXPY | Termination of patent right or utility model |