CN203081512U - Turbine rear vapor seal device - Google Patents
Turbine rear vapor seal device Download PDFInfo
- Publication number
- CN203081512U CN203081512U CN 201320043783 CN201320043783U CN203081512U CN 203081512 U CN203081512 U CN 203081512U CN 201320043783 CN201320043783 CN 201320043783 CN 201320043783 U CN201320043783 U CN 201320043783U CN 203081512 U CN203081512 U CN 203081512U
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- CN
- China
- Prior art keywords
- vapor
- seal
- rotor
- seal ring
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Abstract
The utility model belongs to the technical field of turbines, and provides a turbine rear vapor seal device. The turbine rear vapor seal device comprises a seal body. A first seal ring is arranged inside a rotor groove, and a second seal ring is arranged inside a vapor seal body groove. The first seal ring is provided with two rotor vapor stopping ring surfaces extending along the radial direction of a rotor towards the second seal ring, and the diameter of the rotor vapor stopping ring surface on the upper stream is larger than that of the rotor vapor stopping ring surface on the lower stream along the airflow direction. The second seal ring is provided with two vapor seal body vapor stopping ring surfaces extending out of the vapor seal body, and an included angle is formed between the two vapor seal body vapor stopping ring surfaces. Compared with a traditional high-low tooth structure, a motion path of vapor among seal rings is increased, vapor pressure is lowered more, leakage amount of the vapor is reduced, seal effect is better, allowable axial and radial displacement when the rotor is heated and expanded is enlarged, abrasion of a vapor seal is reduced, and service life of the vapor seal is prolonged.
Description
Technical field
The utility model belongs to the steam turbine technology field, relates in particular to sealing gland behind a kind of steam turbine.
Background technique
Steam turbine be a kind of be power with steam, and the heat energy of steam is converted into the rotating machinery of mechanical work, be most widely used prime mover in the modern thermal power plant, steam turbine has advantages such as single-machine capacity is big, 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 Efficiency of Steam Turbine also reduces greatly.
The model utility content
Technical problem to be solved in the utility model 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 of gap design.
For solving the problems of the technologies described above, the technical solution of the utility model 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 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 second seal ring in the described labyrinth casing groove, described first seal ring has two rotor resistance vapour anchor rings that extend to described second seal ring along described rotor radial, and the described rotor that is positioned at the upstream along airflow direction hinders the diameter of the diameter of vapour anchor ring greater than the described rotor resistance vapour anchor ring that is positioned at the downstream; Described 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 second seal ring and described first seal ring.
As a kind of improvement, the radial clearance between described second seal ring and described first seal ring is 0.5 millimeter.
After having adopted technique scheme, the beneficial effects of the utility model are:
Because 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 second seal ring and first seal ring are provided with the gap between radially, when the rotor expanded by heating, allow axially and all more traditional stage teeth of radial displacement increase greatly, 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 leakage losses to greatest extent, improve leakage efficiency.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
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, 4, first seal ring, 5, second seal ring, the 6, the 3rd seal ring, 7, exhaust cavity.
Embodiment
In order to make the purpose of this utility model, technological scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the structural representation of sealing gland behind the steam turbine that the utility model provides, and Fig. 2 is the enlarged view at A place among Fig. 1, for convenience of explanation, has only provided the part relevant with the utility model among the figure.
As Fig. 1, shown in Fig. 2 is common, sealing gland behind the steam turbine that the utility model 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 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 second seal ring 5 in the labyrinth casing groove, first seal ring 4 has two rotor resistance vapour anchor rings that radially extend to second seal ring 5 along rotor 2, and the rotor that is positioned at the upstream along airflow direction hinders the diameter of the diameter of vapour anchor ring greater than the rotor resistance vapour anchor ring that is positioned at the downstream; 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 second seal ring 5 and first seal ring 4, the radial clearance between second seal ring 5 and first seal ring 4 is 0.5 millimeter.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; Second seal ring 5 and first seal ring 4 are provided with the gap between radially, when rotor 2 expanded by heating, allow axially and all more traditional stage teeth of radial displacement increase greatly, 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 leakage losses to greatest extent, 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 annular groove in the radial direction 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 influenced 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, connects the vapor extractor and the condenser that draws gas on the bleeder hole 11 of cylinder body 1, the steam of extracting out is become condensed water send into thermodynamic system and utilize again, economize on resources.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
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 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 second seal ring in the described labyrinth casing groove, it is characterized in that, described first seal ring has two rotor resistance vapour anchor rings that extend to described second seal ring along described rotor radial, and the described rotor that is positioned at the upstream along airflow direction hinders the diameter of the diameter of vapour anchor ring greater than the described rotor resistance vapour anchor ring that is positioned at the downstream; Described 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 second seal ring and described first seal ring.
2. sealing gland behind the steam turbine as claimed in claim 1 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 |
|---|---|---|---|
| CN 201320043783 CN203081512U (en) | 2013-01-25 | 2013-01-25 | Turbine rear vapor seal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320043783 CN203081512U (en) | 2013-01-25 | 2013-01-25 | Turbine rear vapor seal device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203081512U true CN203081512U (en) | 2013-07-24 |
Family
ID=48827361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320043783 Withdrawn - After Issue CN203081512U (en) | 2013-01-25 | 2013-01-25 | Turbine rear vapor seal device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203081512U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075204A (en) * | 2013-01-25 | 2013-05-01 | 潍坊雷诺特动力设备有限公司 | Back steam seal device of steam turbine |
-
2013
- 2013-01-25 CN CN 201320043783 patent/CN203081512U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075204A (en) * | 2013-01-25 | 2013-05-01 | 潍坊雷诺特动力设备有限公司 | Back steam seal device of steam turbine |
| CN103075204B (en) * | 2013-01-25 | 2015-11-18 | 潍坊雷诺特动力设备有限公司 | Back steam seal device of steam turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130724 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |