CN103075204B - Back steam seal device of steam turbine - Google Patents
Back steam seal device of steam turbine Download PDFInfo
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- CN103075204B CN103075204B CN201310030043.XA CN201310030043A CN103075204B CN 103075204 B CN103075204 B CN 103075204B CN 201310030043 A CN201310030043 A CN 201310030043A CN 103075204 B CN103075204 B CN 103075204B
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- seal ring
- rotor
- steam
- resistance vapour
- labyrinth casing
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention belongs to steam turbine technology field, provide a kind of back steam seal device of steam turbine, comprise envelope body, the first seal ring is provided with in rotor recesses, the second seal ring is provided with in labyrinth casing groove, described first seal ring has two rotor resistance vapour anchor rings extended along described rotor radial to described second seal ring, and the diameter being positioned at the described rotor resistance vapour anchor ring of upstream along airflow direction is greater than the diameter of the described rotor resistance vapour anchor ring being positioned at downstream; Described second seal ring has two labyrinth casings resistance vapour anchor rings, labyrinth casing resistance vapour anchor ring described in two stretch out described labyrinth casing and described in two between labyrinth casing resistance vapour anchor ring shape have angle.Compared with traditional stage teeth structure, the travel of steam between seal ring increases, it is more that vapor pressure reduces, the leakage rate of steam reduces, sealing effect is better, the axis allowed during rotor expanded by heating and radial displacement are all amid a sharp increase, alleviate the wearing and tearing of packing, extend the working life of packing.
Description
Technical field
The invention belongs to steam turbine technology field, particularly relate to a kind of back steam seal device of steam turbine.
Background technique
Steam turbine is a kind of is power with steam, and is the rotating machinery of mechanical work by the thermal energy of steam, and be most widely used prime mover in modern thermal power plant, steam turbine has the advantages such as single-machine capacity is large, efficiency is high, the life-span is long.The air loss of steam turbine accounts for about 1/3 of internal losses, and the packing of steam turbine can prevent ambient air from entering vapor mixing in steam turbine and steam turbine, reduces steam leakage.
The seal arrangement of conventional construction, it is less than normal that packing makes a concession gap design, vibrate when particularly crossing critical speed of rotation and strengthen, cause kinematics and static friction, packing heavy wear, after running a period of time, there will be steam leakage phenomenon, along with the lengthening of unit service time, steam leakage phenomenon can be on the rise, and the efficiency of steam turbine also reduces greatly.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of back steam seal device of steam turbine, is intended to solve the technical problem that traditional gland seal structure makes a concession the little easy wearing and tearing in gap.
For solving the problems of the technologies described above, technological scheme of the present invention is: back steam seal device of steam turbine, comprise the labyrinth casing be arranged between the cylinder body of steam turbine and rotor, described rotor radial direction is provided with the rotor recesses of annular, the first seal ring is provided with in described rotor recesses, described labyrinth casing is provided with the labyrinth casing groove of annular in the radial direction, the second seal ring has been provided with in described labyrinth casing groove, described first seal ring has two rotor resistance vapour anchor rings extended along described rotor radial to described second seal ring, the diameter being positioned at the described rotor resistance vapour anchor ring of upstream along airflow direction is greater than the diameter of the described rotor resistance vapour anchor ring being positioned at downstream, described second seal ring has two labyrinth casings resistance vapour anchor rings, labyrinth casing resistance vapour anchor ring described in two stretch out described labyrinth casing and described in two between labyrinth casing resistance vapour anchor ring shape have angle, form air-flow path between described second seal ring and described first seal ring.
Improve as one, the radial clearance between described second seal ring and described first seal ring is 0.5 millimeter.
After have employed technique scheme, the invention has the beneficial effects as follows:
Because the second seal ring be provided with in labyrinth casing groove has two labyrinth casing resistance vapour anchor rings, two labyrinth casing resistance vapour anchor rings stretch out labyrinth casing and between two labyrinth casing resistance vapour anchor rings, shape has angle, the travel of steam between seal ring increases, it is more that vapor pressure reduces, the leakage rate of steam reduces, and sealing effect is better; Again owing to being provided with gap between the second seal ring and the first seal ring radial direction, the axis allowed when rotor expanded by heating and all more traditional stage teeth of radial displacement increase greatly, and the wearing and tearing of labyrinth ring can reduce greatly, extend the working life of labyrinth ring; In addition, can not consider axially to touch mill, can more seal ring be arranged, reduce leakage losses to greatest extent, improve leakage efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the enlarged view at A place in Fig. 1;
In figure, 1, cylinder body, 11, bleeder hole, 2, rotor, 3, labyrinth casing, 31, exhaust port, the 4, first seal ring, the 5, second seal ring, the 6, the 3rd seal ring, 7, exhaust cavity.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows the structural representation of the back steam seal device of steam turbine that the embodiment of the present invention provides, and Fig. 2 is the enlarged view at A place in Fig. 1, for convenience of explanation, only gives part related to the present invention in figure.
As Fig. 1, Fig. 2 jointly shown in, the back steam seal device of steam turbine that the embodiment of the present invention provides, comprise the labyrinth casing 3 be arranged between the cylinder body 1 of steam turbine and rotor 2, rotor 2 is provided with the rotor recesses of annular in the radial direction, the first seal ring 4 is provided with in rotor recesses, labyrinth casing 3 is provided with the labyrinth casing groove of annular in the radial direction, the second seal ring 5 has been provided with in labyrinth casing groove, first seal ring 4 has two rotor resistance vapour anchor rings extended along rotor 2 radial direction to the second seal ring 5, the diameter being positioned at the rotor resistance vapour anchor ring of upstream along airflow direction is greater than the diameter of the rotor resistance vapour anchor ring being positioned at downstream, second seal ring 5 has two labyrinth casing resistance vapour anchor rings, two labyrinth casing resistance vapour anchor rings stretch out labyrinth casing 3 and between two labyrinth casing resistance vapour anchor rings, shape has angle, form air-flow path between second seal ring 5 and the first seal ring 4, the radial clearance between the second seal ring 5 and the first seal ring 4 is 0.5 millimeter.The second seal ring 5 be provided with in labyrinth casing 3 groove has two labyrinth casing resistance vapour anchor rings, two labyrinth casing resistance vapour anchor rings stretch out labyrinth casing 3 and between two labyrinth casing resistance vapour anchor rings, shape has angle, the travel of steam between seal ring increases, it is more that vapor pressure reduces, the leakage rate of steam reduces, and sealing effect is better; Be provided with gap between second seal ring 5 and the first seal ring 4 radial direction, the axis allowed when rotor 2 expanded by heating and all more traditional stage teeth of radial displacement increase greatly, and the wearing and tearing of labyrinth ring can reduce greatly, extend the working life of labyrinth ring; In addition, can not consider axially to touch mill, can more seal ring be arranged, reduce leakage losses to greatest extent, improve leakage efficiency.
Radial clearance is provided with between cylinder body 1 and labyrinth casing 3, the 3rd seal ring 6 is provided with between cylinder body 1 and labyrinth casing 3, cylinder body 1 is provided with annular groove in radial directions, labyrinth casing 3 is provided with annular groove in axial direction, 3rd seal ring 6 is arranged in the groove on the groove of cylinder body 1 and labyrinth casing 3 axial direction, both make the 3rd seal ring 6 play seal action, also do not affect the expansion of labyrinth casing 3.
Exhaust cavity 7 is provided with between cylinder body 1 and labyrinth casing 3, labyrinth casing 3 is provided with exhaust port 31, cylinder body 1 is provided with bleeder hole 11, exhaust port 31 is connected by exhaust cavity 7 with bleeder hole 11, exhaust port 31 on labyrinth casing 3, can extract out the steam between rotor 2 and labyrinth casing 3, the bleeder hole 11 of cylinder body 1 connects vapor extractor and the condenser that draws gas, the steam of extraction is become condensed water and send into thermodynamic system re-using, economize on resources.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. back steam seal device of steam turbine, comprise the labyrinth casing be arranged between the cylinder body of steam turbine and rotor, described rotor radial direction is provided with the rotor recesses of annular, the first seal ring is provided with in described rotor recesses, described labyrinth casing is provided with the labyrinth casing groove of annular in the radial direction, the second seal ring is provided with in described labyrinth casing groove, it is characterized in that, described first seal ring has two rotor resistance vapour anchor rings extended along described rotor radial to described second seal ring, the diameter being positioned at the described rotor resistance vapour anchor ring of upstream along airflow direction is greater than the diameter of the described rotor resistance vapour anchor ring being positioned at downstream, described second seal ring has two labyrinth casings resistance vapour anchor rings, labyrinth casing resistance vapour anchor ring described in two stretch out described labyrinth casing and described in two between labyrinth casing resistance vapour anchor ring shape have angle, form air-flow path between described second seal ring and described first seal ring.
2. back steam seal device of steam turbine as claimed in claim 1, it is characterized in that, the radial clearance between described second seal ring and described first seal ring is 0.5 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310030043.XA CN103075204B (en) | 2013-01-25 | 2013-01-25 | Back steam seal device of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310030043.XA CN103075204B (en) | 2013-01-25 | 2013-01-25 | Back steam seal device of steam turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103075204A CN103075204A (en) | 2013-05-01 |
| CN103075204B true CN103075204B (en) | 2015-11-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310030043.XA Active CN103075204B (en) | 2013-01-25 | 2013-01-25 | Back steam seal device of steam turbine |
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| Country | Link |
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| CN (1) | CN103075204B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343473B (en) * | 2014-09-02 | 2015-09-09 | 华中科技大学 | A kind of shaft end seal device for organic working medium radial-inward-flow turbine |
| CN110206593A (en) * | 2019-07-04 | 2019-09-06 | 杭州汽轮机股份有限公司 | Floating can make a concession formula interstage gland |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4046388A (en) * | 1976-03-09 | 1977-09-06 | Westinghouse Electric Corporation | Seal arrangement utilizing deflector seals of reduced radial dimension |
| SU756048A1 (en) * | 1977-12-12 | 1980-08-15 | Boris N Korablev | Turbomachine labirinth seal |
| CN101876259A (en) * | 2009-05-01 | 2010-11-03 | 株式会社日立制作所 | Sealing configuration and controlling method thereof |
| CN102269016A (en) * | 2011-07-09 | 2011-12-07 | 潍坊雷诺特动力设备有限公司 | Clapboard steam seal for steam power device |
| CN203081512U (en) * | 2013-01-25 | 2013-07-24 | 潍坊雷诺特动力设备有限公司 | Turbine rear vapor seal device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2408548A (en) * | 2003-11-25 | 2005-06-01 | Alstom Technology Ltd | Finned seals for turbomachinery |
-
2013
- 2013-01-25 CN CN201310030043.XA patent/CN103075204B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4046388A (en) * | 1976-03-09 | 1977-09-06 | Westinghouse Electric Corporation | Seal arrangement utilizing deflector seals of reduced radial dimension |
| SU756048A1 (en) * | 1977-12-12 | 1980-08-15 | Boris N Korablev | Turbomachine labirinth seal |
| CN101876259A (en) * | 2009-05-01 | 2010-11-03 | 株式会社日立制作所 | Sealing configuration and controlling method thereof |
| CN102269016A (en) * | 2011-07-09 | 2011-12-07 | 潍坊雷诺特动力设备有限公司 | Clapboard steam seal for steam power device |
| CN203081512U (en) * | 2013-01-25 | 2013-07-24 | 潍坊雷诺特动力设备有限公司 | Turbine rear vapor seal device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103075204A (en) | 2013-05-01 |
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