CN105318011A - Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor - Google Patents
Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor Download PDFInfo
- Publication number
- CN105318011A CN105318011A CN201510882438.1A CN201510882438A CN105318011A CN 105318011 A CN105318011 A CN 105318011A CN 201510882438 A CN201510882438 A CN 201510882438A CN 105318011 A CN105318011 A CN 105318011A
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- tooth
- sealing
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- rotor
- ring gear
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- 238000007789 sealing Methods 0.000 claims abstract description 149
- 238000009434 installation Methods 0.000 claims abstract description 15
- 230000010355 oscillation Effects 0.000 claims description 35
- 230000004323 axial length Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 24
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of a rotor. The low-leakage-rate F type staggered tooth labyrinth seal comprises a fan-shaped ring. The fan-shaped ring comprises the rotor and an installation crown. Two F type sealing teeth are arranged on the upper end surface of the rotor, and two F type sealing teeth are arranged on the lower end surface of the installation crown. Each F type sealing tooth comprises a straight ruler, a first sealing tooth ring and a second sealing tooth ring, wherein the first sealing tooth ring and the second sealing tooth ring are arranged at the ends of the straight ruler. The F type sealing teeth on the rotor are installed in a top-upward mode, the F type sealing teeth on the installation crown are installed in a bottom-upward mode, and the four F type sealing teeth are arranged in an alternating mode and face the direction of incoming flow. The second sealing tooth rings of F type tooth rings on the rotor and the first sealing tooth rings of F type tooth rings on the installation crown are located on the same horizontal position and form a sealing cavity. According to the low-leakage-rate F type staggered tooth labyrinth seal, the leakage rate is low on the condition of guaranteeing vibration of the rotor, and a sealing structure will not lose effect because of vibration of the rotor.
Description
Technical field
The present invention relates to a kind of labyrinth seal, particularly relate to a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation, be applied to the sealing of turbomachine rotor axial.
Background technique
Leakage rate is one of most important index weighing Sealing quality, and the leakage of seal clearance is the main source of whole turbomachine loss in efficiency.Traditional straight-through labyrinth is employed widely in engineering, and the throttle effect of sealing crown and the interior intense vortical formed of Seal cage to dissipation to energy, add up step by step and reach sealing effect.But the existence due to straight-through leakage flow causes the leakage rate of straight-through labyrinth general larger.When pursuing less leakage rate, many employing zigzag tooth labyrinth seal structures.Zigzag tooth is staggered on rotating component and static element.Unique cross structure prevents the existence of straight-through leakage flow, thus reduces leakage rate.
Along with the development of modern turbomachine, the control for leakage rate becomes strict gradually, requires the sealing effect that sealing is fabulous.The flexible sealing high relative to cost, the structural design of the rigid seal tooth of relative moderate pursues the universal way compared with low leakage.Under the prerequisite unduly increasing manufacture difficulty, the lower leakage rate of transformation pursuit is carried out to sealing toothing and just becomes very important.
In addition, for non-contact seals, rotor oscillation causes tip clearance to change.Conclusion shows that rotor oscillation will obviously increase the leakage rate of rotor sealing system and reduce overall efficiency.One can adapt to rotor oscillation, and can control the sealing configuration of the leakage rate amplification that rotor oscillation brings so become very important.
Summary of the invention
There is extremely low leakage rate under the object of the invention is the condition in order to ensure rotor oscillation, ensureing that sealing configuration can not provide a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation because rotor oscillation was lost efficacy.
The object of the present invention is achieved like this: comprise eccentric circular ring, eccentric circular ring comprises rotor, hat is installed, the upper-end surface of rotor and the lower end surface of installation hat are respectively arranged with two F types sealing teeth, each F type sealing tooth comprises ruler and is arranged on the first sealing ring gear and the second sealing ring gear of ruler end, epitrochanterian F type sealing tooth just installation, the F type sealing tooth installing hat upside down installation, and four F type sealing teeth are alternately arranged also in the face of carrying out flow path direction, the second sealing ring gear and install the F type ring gear labeled first of epitrochanterian F type ring gear seals ring gear and is in same level position, form Seal cage.
The present invention also comprises some structure characteristics like this:
1. the eccentric circular ring described in has 6, is 60 °, and 6 eccentric circular rings are combined into round structure.
2. the inclined-plane horizontal by 40 ° of angles is all arranged in the end of the first sealing ring gear and the second sealing ring gear, and the thickness of the first sealing ring gear and the second sealing ring gear is all 0.3mm, and the axial length of the first sealing ring gear is 1.5-3mm; The axial length of the second sealing ring gear is 2-3.5mm.
3. the radial thickness sealing straight-tooth is: straight-tooth top thickness is 1-2mm, straight-tooth root thickness is 3-5mm.
4. the axial seal gap of adjacent two F types sealing tooth is 0.2-0.4mm.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is applied to the sealing of turbomachine rotor axial, non-contacting sealing configuration effectively can reduce the additional leakage loss of rotor oscillation, increases rotor seal effect.Invention increases the throttling action at F type sealing tooth, fluid flow starts back is abundant, radial more obviously good with axial combined type restriction effect.Due to the parallel sealing ring gear of welding, working medium flowing is diametrically subject to extra throttle effect, and owing to producing complicated vortex motion in sealing toothing Seal cage, energy dissipation is accelerated, reaches extremely low leakage rate and very outstanding sealing effect.For the impact that rotor oscillation brings, two parallel sealing teeth of the present invention can adapt to the change of the radial clearance that rotor oscillation characteristic changing brings.Ensure rotor reach vibration any time have at least one sealing ring gear can produce throttle effect in radial direction.
Accompanying drawing explanation
Fig. 1 is the structural representation after the present invention combines;
Fig. 2 is the structural representation (structural representation of eccentric circular ring) in A-A face in Fig. 1;
Fig. 3 is F type alternating expression labyrinth seal chamber of the present invention schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Composition graphs 1 to Fig. 3, independently eccentric circular ring is assembled by 6 for whole seal ring, being installed of seal ring and casing can be ensured like this, locate, there is installation, convenient disassembly simultaneously and prevent the feature of excessive deformation, wherein the value of cutting gap 9 is 0.2-0.4mm, and wherein orientation angle θ is 5 °-15 °.F type sealing tooth 4 can be observed by A-A cross section to realize by two sealing ring gears 1,2 (first sealing ring gear 2 and the second sealing ring gear 1) are welded together with straight-tooth 3; Epitrochanterian F type sealing tooth is arranged on rotor 5 by groove and becomes positive F type, install the F type sealing tooth labeled by groove be arranged on install hat 6 is formed reversed F-typed.Four F type sealing teeth are staggered, and positive F is consistent with reversed F-typed sealing tooth opening direction, all in the face of carrying out flow path direction.Seal tooth by the F type that rotor 5 and installation hat 6 are arranged in order and jointly form staggered F type sealing configuration; 6 be whole seal ring installation hat, its effect is installed fixing by seal ring and static part; 7 is conveniently install the air drain with dismounting.
Details in the sealing chamber of F type sealing configuration as shown in Figure 3, the structure of F type sealing tooth 4 be by the first sealing ring gear 2 and the second sealing ring gear 1 respectively parallel soldering jointly form at the bizet of straight-tooth and neck, wherein by bottom straight-tooth overstriking design be to reduce stress thus fatigue strength, increase sealing life.Sealing effect under vibration condition is achieved in that when rotor does not vibrate, and the first sealing ring gear 2 and the positive F type in upstream of the sealing of falling F tooth seals second of tooth and seal ring gear 1 and keep uniform level position, and now sealing ring gear 1,2 plays throttling action jointly.During rotor oscillation, positive F type sealing ring gear vibrates along with rotor, and the sealing ring gear 2 of reversed F-typed sealing ring gear can lose at sealing ring gear 1 throttling function moment performance throttle effect to bring leakage change with the vibration adapting to rotor.In Fig. 2,8 is the welding position that two sealing ring gears are connected with straight-tooth 3, and weld seam is uniform in the both sides of joint.
The present invention can also comprise some structure characteristics like this:
The distance on F type annular seal and Seal cage top is 1.5-3.5mm.
Axial adjacent seals tooth minimum axial gap place distance is 0.2-0.4mm.
For ensureing the strength and stiffness of Sealing, sealing straight-tooth tooth radial thickness is changing value, and straight-tooth top thickness is 1-2mm; Straight-tooth root thickness is 3-5mm.
Second sealing ring gear 1 and the first thickness sealing ring gear 2 are 0.3mm.
The axial length of the first sealing ring gear 2 is 1.5-3mm; The axial length of the second sealing ring gear 1 is 2-3.5mm.
For ensureing that the end cut of horizontal seal ring gear 1,2 becomes and back parallel angle 40 ° with the good restriction effect in upstream seal back of tooth portion by level two sealing ring gear.
Principle of the present invention is such: conventional seals straight-tooth is welded two parallel sealing ring structure F type sealing ring gears.F RunddichtringO is staggered by groove and is arranged on rotor and installation and labels into positive F and the sealing configuration of falling F.Sealing structure adds the throttling action at sealing tooth, and fluid flow starts back is abundant, radial more obviously good with axial combined type restriction effect.Due to the parallel sealing ring gear of welding, working medium flowing is diametrically subject to extra throttle effect, and owing to producing complicated vortex motion in sealing toothing Seal cage, energy dissipation is accelerated, reaches extremely low leakage rate and very outstanding sealing effect.For the impact that rotor oscillation brings, two parallel sealing teeth of this structure can adapt to the change of the radial clearance that rotor oscillation characteristic changing brings.Ensure rotor reach vibration any time have at least one sealing ring gear can produce throttle effect in radial direction.
By be arranged on rotor with install the F type labeled seal toothing increase seal tooth throttle effect and Seal cage in the dissipation of kinetic energy to ensure extremely outstanding sealing effect and extremely low leakage rate.Only need the sealing effect that the seal ring quantity of conventional rigid non-contact seals half can reach the same.This sealing configuration is simple, adaptable to rotor, install, dismounting, replace all more convenient.The special construction of multiple F type sealing tooth determines jointly, and the mating reaction between F type sealing ring gear fully can tackle the change of radial clearance change that rotor oscillation causes and leakage rate, and guarantee rotor oscillation can not increase leakage rate.
The object of the present invention is achieved like this: independently eccentric circular ring is assembled by 6 for whole seal ring.The segment angle of 6 fan rings is 60 °.Sealing ring gear 1 is welded on sealing ring gear 2 bizet and neck that seal straight-tooth 3 abreast respectively, and sealing odontoid is processed into F type.F type sealing tooth is arranged on rotor and stator alternately.Its F type seals tooth opening surface to incoming flow, as shown in structural drawing 1.Increase throttle effect by the unique texture of F type sealing tooth, increase sealing effective length, and increase radial throttling.Rotor oscillation causes radial clearance cyclically-varying above tooth top.Be fixed on the F type sealing tooth transfixion of installing and labeling, upstream be arranged on epitrochanterian F type sealing tooth when moving upward, tip clearance reduces, and now downstream seal ring gear 1 and 2 plays throttling action jointly.Along with rotor oscillation, be fixed on epitrochanterian F type sealing tooth when moving downwardly to the horizontal position of sealing ring gear 1 of axis residing for sealing ring gear 2 lower than downstream F type sealing tooth, now the sealing ring gear 1 of epitrochanterian F type sealing tooth loses most throttling function, but remain that its position is lower than upstream seal tooth before now F type sealing ring gear 2 can ensure rotor motion to minimum point, ensure that sealing tooth throttle effect diametrically fully realizes.In brief, be just mounted in and the inverted F-type sealing configuration labeled is installed can ensures in the nargin on rotor oscillation border, axially can give full play to the throttle effect of radial compound formula, and the ability of radial throttling is along with rotor oscillation determining positions.Alternating expression F type sealing toothing can adapt to this condition of rotor oscillation and ensure that vibration will obviously make leakage rate increase.
The invention discloses a kind of low leakage F type zigzag tooth labyrinth seal structure that can adapt to rotor oscillation, this structure comprise can split dismounting seal ring, be arranged on the seal ring of straight-tooth that seal ring and installation label and welding parallel with straight-tooth.The F type sealing configuration that the present invention utilizes seal ring and straight-tooth to form increases the throttle effect of radial direction.The arrangement mode of adjacent seals tooth ensures, in the up-and-down boundary of rotor oscillation, to have at least a horizontal seal circle to play throttling action.Utilize F type to seal tooth self structure and axial flow sealing is converted into compound seal form that is radial and axis.Thus the leakage rate of sealing system can be reduced, and can rotor oscillation be adapted to, weaken the increase that rotor oscillation brings leakage rate, improve the efficiency of turbomachine.Meanwhile, the collision that larger radial clearance can fully avoid sealing tooth and rotor or stator to avoid and friction.
Also namely the present invention includes and be arranged on epitrochanterian positive F type sealing ring gear; Be arranged on the reversed F-typed sealing ring gear installed in hat; Be embedded in the parallel sealing circle on straight-tooth, jointly form F type sealing configuration with straight-tooth; Parallel sealing circle top in F type sealing configuration and rotor or install to be preced with and form radial seal gap; Parallel sealing circle border in F type sealing configuration and upstream seal back of tooth portion form axial seal gap; Positive F type sealing configuration and reversed F-typed sealing configuration form sealed chamber jointly.
Installing hat top is notching construction, and groove depth is 2-3mm; Its both sides are equipped with air drain.Positive F type seal ring is arranged on rotor by groove; Reversed F-typed seal ring is arranged on by groove to install in hat; F type sealing tooth parallel sealing circle is embedded in straight-tooth seal ring bizet and neck.
Claims (9)
1. one kind can adapt to the low leakage F type zigzag tooth labyrinth seal of rotor oscillation, it is characterized in that: comprise eccentric circular ring, eccentric circular ring comprises rotor, hat is installed, the upper-end surface of rotor and the lower end surface of installation hat are respectively arranged with two F types sealing teeth, each F type sealing tooth comprises ruler and is arranged on the first sealing ring gear and the second sealing ring gear of ruler end, epitrochanterian F type sealing tooth just installation, the F type sealing tooth installing hat upside down installation, and four F type sealing teeth are alternately arranged also in the face of carrying out flow path direction, the second sealing ring gear and install the F type ring gear labeled first of epitrochanterian F type ring gear seals ring gear and is in same level position, form Seal cage.
2. a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation according to claim 1, it is characterized in that: described eccentric circular ring has 6, be 60 °, 6 eccentric circular rings are combined into round structure.
3. a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation according to claim 1 and 2, it is characterized in that: the inclined-plane horizontal by 40 ° of angles is all arranged in the end of the first sealing ring gear and the second sealing ring gear, the thickness of the first sealing ring gear and the second sealing ring gear is all 0.3mm, and the axial length of the first sealing ring gear is 1.5-3mm; The axial length of the second sealing ring gear is 2-3.5mm.
4. a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation according to claim 1 and 2, is characterized in that: the radial thickness of sealing straight-tooth is: straight-tooth top thickness is 1-2mm, straight-tooth root thickness is 3-5mm.
5. a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation according to claim 3, is characterized in that: the radial thickness of sealing straight-tooth is: straight-tooth top thickness is 1-2mm, straight-tooth root thickness is 3-5mm.
6. a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation according to claim 1 and 2, is characterized in that: the axial seal gap of adjacent two F types sealing tooth is 0.2-0.4mm.
7. a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation according to claim 3, is characterized in that: the axial seal gap of adjacent two F types sealing tooth is 0.2-0.4mm.
8. a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation according to claim 4, is characterized in that: the seal clearance of adjacent two F types sealing tooth is 0.2-0.4mm.
9. a kind of low leakage F type zigzag tooth labyrinth seal that can adapt to rotor oscillation according to claim 5, is characterized in that: the seal clearance of adjacent two F types sealing tooth is 0.2-0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510882438.1A CN105318011B (en) | 2015-12-03 | 2015-12-03 | Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510882438.1A CN105318011B (en) | 2015-12-03 | 2015-12-03 | Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105318011A true CN105318011A (en) | 2016-02-10 |
| CN105318011B CN105318011B (en) | 2017-04-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510882438.1A Expired - Fee Related CN105318011B (en) | 2015-12-03 | 2015-12-03 | Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor |
Country Status (1)
| Country | Link |
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| CN (1) | CN105318011B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673862A (en) * | 2016-03-24 | 2016-06-15 | 国家电网公司 | Circumferential brush type catch air seal |
| US11293295B2 (en) | 2019-09-13 | 2022-04-05 | Pratt & Whitney Canada Corp. | Labyrinth seal with angled fins |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB346726A (en) * | 1928-10-09 | 1931-04-15 | Ass Elect Ind | Improvements relating to labyrinth packing |
| CN2400576Y (en) * | 1999-12-24 | 2000-10-11 | 骆义根 | Double-tooth-tip multitooth glands |
| CN101907171A (en) * | 2009-06-02 | 2010-12-08 | 刘美琴 | Labyrinth seal |
| DE102010026336A1 (en) * | 2010-07-07 | 2012-01-12 | Siemens Aktiengesellschaft | A shaft sealing apparatus |
| CN102322529A (en) * | 2010-05-11 | 2012-01-18 | 通用电气公司 | Crooked labyrinth seal |
| CN103277146A (en) * | 2013-05-15 | 2013-09-04 | 山东青能动力股份有限公司 | Symmetrical lateral tooth steam sealing structure |
| CN103670534A (en) * | 2012-08-28 | 2014-03-26 | 通用电气公司 | Seal design and active clearance control strategy for turbomachines |
| CN205207690U (en) * | 2015-12-03 | 2016-05-04 | 哈尔滨工程大学 | Crisscross tooth labyrinth seals of low leakage F type that can adapt to rotor oscillation |
-
2015
- 2015-12-03 CN CN201510882438.1A patent/CN105318011B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB346726A (en) * | 1928-10-09 | 1931-04-15 | Ass Elect Ind | Improvements relating to labyrinth packing |
| CN2400576Y (en) * | 1999-12-24 | 2000-10-11 | 骆义根 | Double-tooth-tip multitooth glands |
| CN101907171A (en) * | 2009-06-02 | 2010-12-08 | 刘美琴 | Labyrinth seal |
| CN102322529A (en) * | 2010-05-11 | 2012-01-18 | 通用电气公司 | Crooked labyrinth seal |
| DE102010026336A1 (en) * | 2010-07-07 | 2012-01-12 | Siemens Aktiengesellschaft | A shaft sealing apparatus |
| CN103670534A (en) * | 2012-08-28 | 2014-03-26 | 通用电气公司 | Seal design and active clearance control strategy for turbomachines |
| CN103277146A (en) * | 2013-05-15 | 2013-09-04 | 山东青能动力股份有限公司 | Symmetrical lateral tooth steam sealing structure |
| CN205207690U (en) * | 2015-12-03 | 2016-05-04 | 哈尔滨工程大学 | Crisscross tooth labyrinth seals of low leakage F type that can adapt to rotor oscillation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673862A (en) * | 2016-03-24 | 2016-06-15 | 国家电网公司 | Circumferential brush type catch air seal |
| US11293295B2 (en) | 2019-09-13 | 2022-04-05 | Pratt & Whitney Canada Corp. | Labyrinth seal with angled fins |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105318011B (en) | 2017-04-12 |
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