CN103075204A - Back steam seal device of steam turbine - Google Patents
Back steam seal device of steam turbine Download PDFInfo
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- CN103075204A CN103075204A CN201310030043XA CN201310030043A CN103075204A CN 103075204 A CN103075204 A CN 103075204A CN 201310030043X A CN201310030043X A CN 201310030043XA CN 201310030043 A CN201310030043 A CN 201310030043A CN 103075204 A CN103075204 A CN 103075204A
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Abstract
The invention belongs to the technical field of steam turbines and provides a back steam seal device of a steam turbine. The back steam seal device comprises a seal body, wherein a groove of a rotor is internally provided with a first seal ring, a groove of a steam seal body is internally provided with a second seal ring, the first seal ring is provided with two rotor steam-stopping ring faces extending to the second seal ring along the radial direction of the rotor, and the diameter of the upstream rotor steam-stopping ring face is more than that of the downstream rotor steam-stopping ring face along an air flow direction; and the second seal ring is provided with two steam-seal-body steam-stopping ring faces which extend out of the steam seal body, and an included angle is formed between the two steam-seal-body steam-stopping ring faces. Compared with the traditional stage tooth structure, the back steam seal device has the advantages that a moving path of steam between the seal rings is increased, so that more pressure of the steam is reduced, the leakage quantity of the steam is reduced, a seal effect is better, the allowable displacement in axial and radial directions is increased to certain extent when the rotor expands under heat, thus, the abrasion of the steam seal device is reduced, and the service life of the steam seal device is prolonged.
Description
Technical field
The invention belongs to the steam turbine technology field, relate in particular to sealing gland behind a kind of steam turbine.
Background technique
Steam turbine is a kind of take steam as power, and the heat energy of steam is converted into the rotating machinery of mechanical work, is most widely used prime mover in the modern thermal power plant, and steam turbine has the advantages such as single-machine capacity is large, efficient 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 that ambient air from entering the vapor mixing in steam turbine and the steam turbine, reduces steam leakage.
The seal arrangement of conventional construction, it is less than normal that packing is made a concession gap design, vibration strengthens when particularly crossing critical speed of rotation, cause dynamic and static friction, packing heavy wear is after operation a period of time, the steam leakage phenomenon can appear, along with the unit lengthening of service time, the steam leakage phenomenon can be on the rise, and the efficient of steam turbine also reduces greatly.
Summary of the invention
Technical problem to be solved by this invention is: sealing gland behind a kind of steam turbine is provided, is intended to solve the technical problem that traditional gland seal structure is made 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: sealing gland behind the steam turbine, comprise the cylinder body that is arranged at steam turbine and the labyrinth casing between the rotor, described rotor radial direction is provided with the rotor recesses of annular, be provided with the first seal ring in the described rotor recesses, described labyrinth casing is provided with the labyrinth casing groove of annular in the radial direction, be provided with the second seal ring in the described labyrinth casing groove, described the first seal ring has two rotor resistance vapour anchor rings that extend along described rotor radial to described the second seal ring, and the described rotor that is positioned at the upstream along airflow direction hinders the diameter of vapour anchor ring greater than the diameter of the described rotor resistance vapour anchor ring that is positioned at the downstream; Described the second seal ring has two labyrinth casing resistance vapour anchor rings, and two described labyrinth casing resistance vapour anchor rings stretch out between described labyrinth casing and the two described labyrinth casing resistance vapour anchor rings and form an angle, form air-flow path between described the second seal ring and described the first seal ring.
As a kind of improvement, the radial clearance between described the second seal ring and described the first seal ring is 0.5 millimeter.
After having adopted technique scheme, the invention has the beneficial effects as follows:
Because the second seal ring that is provided with in the labyrinth casing groove has two labyrinth casing resistance vapour anchor rings, two labyrinth casings resistance vapour anchor ring stretches out between labyrinth casing and the two labyrinth casings resistance vapour anchor ring and forms an angle, the motion distance 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 because the second seal ring and the first seal ring are provided with the gap between radially, when the rotor expanded by heating, allow axially and radial displacement all more traditional stage teeth greatly increase, the wearing and tearing of labyrinth ring can reduce greatly, the working life of prolongation labyrinth ring; In addition, can not consider axially to bump mill, can arrange more seal ring, reduce to greatest extent leakage losses, improve leakage efficiency.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is the enlarged view at A place among Fig. 1;
Among the 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 purpose of the present invention, technological scheme and advantage clearer, 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, is not intended to limit the present invention.
Fig. 1 shows the structural representation of sealing gland behind the steam turbine that the embodiment of the invention provides, and Fig. 2 is the enlarged view at A place among Fig. 1, for convenience of explanation, has only provided part related to the present invention among the figure.
Such as Fig. 1, shown in Fig. 2 is common, sealing gland behind the steam turbine that the embodiment of the invention provides, comprise the cylinder body 1 that is arranged at steam turbine and the labyrinth casing 3 between the rotor 2, rotor 2 is provided with the rotor recesses of annular in the radial direction, be provided with the first seal ring 4 in the rotor recesses, labyrinth casing 3 is provided with the labyrinth casing groove of annular in the radial direction, be provided with the second seal ring 5 in the labyrinth casing groove, the first seal ring 4 has two rotor resistance vapour anchor rings that radially extend to the second seal ring 5 along rotor 2, and the rotor that is positioned at the upstream along airflow direction hinders the diameter of vapour anchor ring greater than the diameter of the rotor resistance vapour anchor ring that is positioned at the downstream; The second seal ring 5 has two labyrinth casing resistance vapour anchor rings, two labyrinth casings resistance vapour anchor ring stretches out between labyrinth casing 3 and the two labyrinth casings resistance vapour anchor ring and forms an angle, form air-flow path between the 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 that is provided with in labyrinth casing 3 grooves has two labyrinth casing resistance vapour anchor rings, two labyrinth casings resistance vapour anchor ring stretches out between labyrinth casing 3 and the two labyrinth casings resistance vapour anchor ring and forms an angle, the motion distance of steam between seal ring increases, it is more that vapor pressure reduces, the leakage rate of steam reduces, and sealing effect is better; The second seal ring 5 and the first seal ring 4 are provided with the gap between radially, when rotor 2 expanded by heating, allow axially and radial displacement all more traditional stage teeth greatly increase, the wearing and tearing of labyrinth ring can reduce greatly, the working life of prolongation labyrinth ring; In addition, can not consider axially to bump mill, can arrange more seal ring, reduce to greatest extent leakage losses, improve leakage efficiency.
Be provided with radial clearance between cylinder body 1 and the labyrinth casing 3, be provided with the 3rd seal ring 6 between cylinder body 1 and the labyrinth casing 3, be provided with in the radial direction annular groove on the cylinder body 1, labyrinth casing 3 is provided with annular groove in axial direction, the 3rd seal ring 6 is installed in the groove and the groove on labyrinth casing 3 axial directions of cylinder body 1, both make the 3rd seal ring 6 play seal action, also do not affected the expansion of labyrinth casing 3.
Be provided with exhaust cavity 7 between cylinder body 1 and the 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 the labyrinth casing 3 can be extracted the steam between rotor 2 and the labyrinth casing 3 out, at the bleeder hole 11 connection vapor extractors of cylinder body 1 and the condenser that draws gas, the steam of extracting out is become condensed water send into the thermodynamic system re-using, economize on resources.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. sealing gland behind the steam turbine, comprise the cylinder body that is arranged at steam turbine and the labyrinth casing between the rotor, described rotor radial direction is provided with the rotor recesses of annular, be provided with the first seal ring in the described rotor recesses, described labyrinth casing is provided with the labyrinth casing groove of annular in the radial direction, be provided with the second seal ring in the described labyrinth casing groove, it is characterized in that, described the first seal ring has two rotor resistance vapour anchor rings that extend along described rotor radial to described the second seal ring, and the described rotor that is positioned at the upstream along airflow direction hinders the diameter of vapour anchor ring greater than the diameter of the described rotor resistance vapour anchor ring that is positioned at the downstream; Described the second seal ring has two labyrinth casing resistance vapour anchor rings, and two described labyrinth casing resistance vapour anchor rings stretch out between described labyrinth casing and the two described labyrinth casing resistance vapour anchor rings and form an angle, form air-flow path between described the second seal ring and described the first seal ring.
2. sealing gland behind the steam turbine as claimed in claim 1 is characterized in that, the radial clearance between described the second seal ring and described the 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 true CN103075204A (en) | 2013-05-01 |
| CN103075204B CN103075204B (en) | 2015-11-18 |
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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 |
Country Status (1)
| Country | Link |
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| CN (1) | CN103075204B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343473A (en) * | 2014-09-02 | 2015-02-11 | 华中科技大学 | 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 (6)
| 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 |
| US20080112800A1 (en) * | 2003-11-25 | 2008-05-15 | Blatchford David P | Finned Seals for Turbomachinery |
| 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 |
-
2013
- 2013-01-25 CN CN201310030043.XA patent/CN103075204B/en active Active
Patent Citations (7)
| 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 |
| JPS52109066A (en) * | 1976-03-09 | 1977-09-12 | Westinghouse Electric Corp | Sealing device |
| SU756048A1 (en) * | 1977-12-12 | 1980-08-15 | Boris N Korablev | Turbomachine labirinth seal |
| US20080112800A1 (en) * | 2003-11-25 | 2008-05-15 | Blatchford David P | Finned Seals for Turbomachinery |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343473A (en) * | 2014-09-02 | 2015-02-11 | 华中科技大学 | Shaft end seal device for organic working medium radial-inward-flow turbine |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103075204B (en) | 2015-11-18 |
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