CN201953418U - Composite toothed steam seal - Google Patents
Composite toothed steam seal Download PDFInfo
- Publication number
- CN201953418U CN201953418U CN201020682501XU CN201020682501U CN201953418U CN 201953418 U CN201953418 U CN 201953418U CN 201020682501X U CN201020682501X U CN 201020682501XU CN 201020682501 U CN201020682501 U CN 201020682501U CN 201953418 U CN201953418 U CN 201953418U
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- China
- Prior art keywords
- tooth
- steam seal
- packing
- teeth
- utility
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- Expired - Lifetime
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Abstract
The utility model discloses a composite toothed steam seal, which comprises a steam seal ring. High teeth are disposed at the bottom of the steam seal ring, and bottom teeth are further arranged at the bottom of the steam seal ring, and axial teeth are arranged on the high teeth so that a labyrinth cavity is formed at the bottom of the steam seal ring. The axial teeth are added to the high teeth of an existing comb-toothed steam seal, the labyrinth cavity can be added into the composite toothed steam seal so as to improve friction resistance effect, and accordingly steam blocking effect of the steam seal teeth is strengthened.
Description
Technical field
The utility model relates to a kind of packing, relates in particular to a kind of compound tooth-like packing, belongs to the turbomachinery field of sealing technology.
Background technique
Steam turbine has stator and rotor two large divisions.Rotor high-speed rotation when work, stator is fixed, so must keep certain clearance between rotor and the stator, does not make the phase mutual friction.When vapor stream was crossed each level work of steam turbine, pressure, temperature descended step by step, existed pressure reduction in the dividing plate both sides.When moving vane has degree of reaction, also exist pressure reduction before and after the moving vane.Steam flows through the acting from the passage of stator, movable vane except the overwhelming majority, and sub-fraction can flow through from various gaps and not do work, and becomes a kind of loss, has reduced the efficient of unit.
Rotor also must pass cylinder, is supported on the bearing, also must leave the gap herein.For the front end of high pressure cylinder two ends and intermediate cylinder, the vapor pressure in the cylinder will have steam to spill herein greater than external atmospheric pressure, reduce unit efficiency, and cause the loss of part water of condensation., pass in the gap of cylinder because of the vapor pressure in the cylinder is lower than extraneous atmospheric pressure at the two ends of the exhaust end of intermediate pressure cylinder and low pressure (LP) cylinder, will have air to bleed in the cylinder at main shaft.Because air can not condense, thereby has reduced degree of vacuum, reduced steam acting ability in vapour condenser.
In order to reduce the gas leakage in the above-mentioned gap everywhere, guarantee the normal safe operation of steam turbine again, the spy is provided with various packings.These packings can be divided into flow passage component packing, diaphragm gland and shaft end gland seal three major types.With regard to working principle, this three classes packing all belongs to labyrinth gland.
Shaft end gland seal mostly is the stage teeth packing, all is designed to multi-segment structure, is made up of several labyrinth rings 3 for every section, between adjacent two sections steam chest is set, as shown in Figure 1.Gland sealing gear is processing or is embedded on the packing segmental arc that the packing segmental arc is divided formation labyrinth ring in the annular channel that can be inlaid in the labyrinth casing inwall again, and whole labyrinth ring is made up of 6 ~ 8 sections packing segmental arcs.The packing segmental arc adopts yielding support, promptly connects a spring sheet with pin on the periphery of each segmental arc, embeds conduit rear spring rear spring sheet the supporting surface of segmental arc and conduit is fitted.Because existing packing profile of tooth is single, resistance vapour tooth has only a direction, has weakened the resistance vapour effect of gland sealing gear so greatly.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of compound tooth-like packing, can increase the chamber, labyrinth, with the increase frictional resistance effect, thus the resistance vapour effect of reinforcement gland sealing gear.
The utility model is to solve the problems of the technologies described above the technological scheme that adopts to provide a kind of compound tooth-like packing, comprises labyrinth ring, and described labyrinth ring bottom is provided with high tooth, and wherein, described high tooth is provided with axial tooth makes the labyrinth ring bottom form the chamber, labyrinth.
Above-mentioned compound tooth-like packing, wherein, described labyrinth ring bottom is provided with end tooth.
The utility model contrast prior art has following beneficial effect: the compound tooth-like packing that the utility model provides, add axial tooth by high tooth at existing serrate-type steam seal, and making has increased the chamber, labyrinth in the confined space, to increase frictional resistance effect.
Description of drawings
Fig. 1 is existing gland seal structure schematic representation;
Fig. 2 is the compound tooth-like packing cutaway view Amplified image of the utility model band axial tooth;
Fig. 3 is the compound tooth-like packing cutaway view Amplified image of tooth at the bottom of the utility model band;
Fig. 4 is the compound tooth-like packing cutaway view Amplified image of the utility model band axial tooth and end tooth.
Among the figure:
1 axial tooth, 2 end tooth, 3 labyrinth rings
4 high teeth
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
Fig. 2～Fig. 4 is the cutaway view Amplified image along A-A line among Fig. 1, and wherein, Fig. 2 is the compound tooth-like packing cutaway view Amplified image of the utility model band axial tooth; Fig. 3 is the compound tooth-like packing cutaway view Amplified image of tooth at the bottom of the utility model band; Fig. 4 is the compound tooth-like packing cutaway view Amplified image of the utility model band axial tooth and end tooth.
See also Fig. 2, the compound tooth-like packing that Fig. 3 and Fig. 4, the utility model provide comprises labyrinth ring 3, and described labyrinth ring 3 bottoms are provided with high tooth 4, and wherein, described high tooth 4 is provided with axial tooth 1 makes labyrinth ring 3 bottoms form the chamber, labyrinth.
Above-mentioned compound tooth-like packing, described labyrinth ring can also be provided with end tooth 2 on 3 bottoms.
The compound tooth-like packing that the utility model provides, break former interdigitated electrode structure gland seal structure, employing at additional axial tooth 1 on the high tooth 4, additional axial tooth 1 at tooth 2 at the bottom of the some roads of labyrinth ring bottom design and on high tooth, tooth 2 these two kinds of structures combine at the bottom of the some roads of labyrinth ring bottom design, form compound tooth-like gland seal structure.
In sum, the compound tooth-like packing that the utility model provides has composite teeth and end tooth in " admission " face design of existing serrate-type steam seal straight-tooth, and making has increased the chamber, labyrinth in the confined space, vapour (gas) is produced bigger damping, to increase frictional resistance effect.
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.
Claims (2)
1. a compound tooth-like packing comprises labyrinth ring (3), and described labyrinth ring (3) bottom is provided with high tooth (4), it is characterized in that, described high tooth (4) is provided with axial tooth (1) makes labyrinth ring (3) bottom form the chamber, labyrinth.
2. compound tooth-like packing as claimed in claim 1 is characterized in that, described labyrinth ring (3) bottom is provided with end tooth (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020682501XU CN201953418U (en) | 2010-12-28 | 2010-12-28 | Composite toothed steam seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020682501XU CN201953418U (en) | 2010-12-28 | 2010-12-28 | Composite toothed steam seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201953418U true CN201953418U (en) | 2011-08-31 |
Family
ID=44497535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020682501XU Expired - Lifetime CN201953418U (en) | 2010-12-28 | 2010-12-28 | Composite toothed steam seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201953418U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089321A (en) * | 2016-08-25 | 2016-11-09 | 张家港市中程进出口贸易有限公司 | A kind of internal combustion engine packing |
| CN106150563A (en) * | 2016-08-25 | 2016-11-23 | 张家港市中程进出口贸易有限公司 | Internal combustion engine packing |
-
2010
- 2010-12-28 CN CN201020682501XU patent/CN201953418U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089321A (en) * | 2016-08-25 | 2016-11-09 | 张家港市中程进出口贸易有限公司 | A kind of internal combustion engine packing |
| CN106150563A (en) * | 2016-08-25 | 2016-11-23 | 张家港市中程进出口贸易有限公司 | Internal combustion engine packing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110831 |
|
| CX01 | Expiry of patent term |