CN205744001U - Seal structure and there is its steam turbine - Google Patents
Seal structure and there is its steam turbine Download PDFInfo
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- CN205744001U CN205744001U CN201620620009.7U CN201620620009U CN205744001U CN 205744001 U CN205744001 U CN 205744001U CN 201620620009 U CN201620620009 U CN 201620620009U CN 205744001 U CN205744001 U CN 205744001U
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- sealing structure
- joint part
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- 238000007789 sealing Methods 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims description 3
- 238000003032 molecular docking Methods 0.000 claims description 3
- 241000233855 Orchidaceae Species 0.000 claims 2
- 230000008859 change Effects 0.000 description 7
- 206010003694 Atrophy Diseases 0.000 description 3
- 230000037444 atrophy Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010977 unit operation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
This utility model provides a kind of steam turbine sealing structure and having it, and this sealing structure includes that the first flange portion that sealing ring body, sealing ring body include being arranged concentrically and the second flange portion, the first flange portion and the second flange portion are connected by elastic joint part.Sealing structure in this utility model solves the problem that the sealing property of steam turbine of the prior art is poor.
Description
Technical field
This utility model relates to parts field of sealing technology, in particular to a kind of steam turbine sealing structure and having it.
Background technology
At present, owing to the economy scope of direct air-cooling turbine is relatively big, and affected by ambient temperature the biggest, led
Cause exhaust temperature changes greatly.In order to adapt to the change of bearing load caused by the change of low pressure (LP) cylinder upper bearing (metal) absolute altitude, reduce because of
The rising of the bearing temperature caused by the change of bearing load, the generation of minimizing vibration, and increase the stability of axle system, existing
The support pattern of the low pressure (LP) cylinder bearings at both ends of Direct Air-Cooled condensing turbine all uses floor bearing.
But, existing low pressure shaft seal body is arranged on floor bearing seat, and low pressure (LP) cylinder shaft seal housing and low pressure (LP) cylinder are because of steam discharge temperature
Degree change and to produce relative swell increment (displacement) bigger.In the prior art, the sealing between lp outer casing and shaft seal housing
Former employing superposition steel disc seals, after change rubber "O"-ring into and seal, expose problems with after unit operation:
1, original state cannot be recoiled to after making to superpose steel disc compression with the relative shift of shaft seal housing due to low pressure cylinder body, because of
This so that low pressure (LP) cylinder is poor with the sealing effectiveness of shaft seal housing, and vacuum leakage quantity is relatively big, and vacuum tightness is the most defective.
Through test, the vacuum tightness test of this seal form is all higher than 1000Pa/min, to the safety economy of unit
Operation brings and has a strong impact on.Although can processing through leakage detection, but effect being the most inconspicuous, and the vacuum system found is tight
Weight leakage point is positioned at the sealing of turbine low pressure cylinder and low pressure shaft seal body.
2, lp outer casing changes the sealing of rubber "O"-ring into, after unit operation when A level is overhauled with the seal form of shaft seal housing
Checking and find that rubber "O"-ring is serious by high-temperature embrittlement, its atrophy situation that shortens is the most serious.Seam has come unglued atrophy about
About 150mm, it is impossible to form " O " circle integral sealing form, and the sealed diameter direction atrophy of "O"-ring attenuates the tightest
, still there is sealing effectiveness poor in weight.
Later, low pressure shaft seal changes TK side flute profile into, solves and reveals at axle envelope, but, still there is bigger leakage at shaft seal housing
Amount.Shaft seal housing relies on "O"-ring to seal with the low pressure (LP) cylinder of steam turbine, and, install sealing additional in the outside of low pressure (LP) cylinder shaft seal housing
Box has also carried out injecting glue process, and in the short time, effect is more apparent, but after unit longtime running, "O"-ring and fluid sealant all exist
Problem of Failure, sealing effectiveness is gradually deteriorated, and has had a strong impact on the safety and economic operation of steam turbine.
Visible, the vacuum tightness of unit is poor, and the leak test of vacuum is all higher than 1000Pa/min, considerably beyond sky
Standard value 130Pa/min of cold group, while units consumption increases, vacuum tightness difference directly influences again the vacuum of unit
Value, refined condensate treatment value, unit load in summer and air cooling blower fan power consumption, bring serious shadow to the safety and economic operation of unit
Ringing, the operating mode in summer is run and is made the rated load of unit be restricted.
Utility model content
Main purpose of the present utility model is to provide a kind of steam turbine sealing structure and having it, to solve existing skill
The problem that the sealing property of the steam turbine in art is poor.
To achieve these goals, according to an aspect of the present utility model, it is provided that a kind of sealing structure, including sealing
Ring body, sealing ring body includes the first flange portion and the second flange portion being arranged concentrically, the first flange portion and the second flange portion
Connected by elastic joint part.
Further, the first flange portion is positioned at the outside of the second flange portion, and elastic joint part is provided with elastic groove, elastic
Grooved ring is arranged around the second flange portion.
Further, the cross section of elastic joint part is U-shaped, one end of the peristome of elastic joint part and the first flange portion
Connecting, the other end of the peristome of elastic joint part and the second flange portion connect.
Further, sealing ring body includes the segmental arc that multiple head and the tail connect successively.
Further, sealing ring body includes the first hemizonid and the second hemizonid, the first hemizonid and the second hemizonid
Dock mutually；The first half flanges that first flange portion includes docking mutually and the second half flanges, the second flange portion includes docked mutually
3 half flanges and the 4th half flange, the first half flanges and the 3rd half flange be arranged on the first hemizonid, the second half flanges and
4th half flange is arranged on the second hemizonid.
Further, the end of the first hemizonid is connected by fastening bolt with the end of the second hemizonid.
Further, the end of the first hemizonid is provided with the first fastening block, and the second hemizonid is provided with the second fastening
Block, fastening bolt is located on the first fastening block and the second fastening block.
Further, the end of the first hemizonid is provided with detent, and the end of the second hemizonid is provided with convex
Rising, positioning convex is plugged in detent.
Further, detent includes the first straight-line groove, the second straight-line groove and connects the first straight-line groove and the second straight line
The U-lag of groove, the first straight-line groove is arranged in the first flange portion, and the second straight-line groove is arranged in the second flange portion, and U-lag is arranged
On elastic joint part；The matching form of the shape of positioning convex and detent closes.
According to another aspect of the present utility model, it is provided that a kind of steam turbine, including low pressure (LP) cylinder, shaft seal housing and connection low pressure
The sealing structure of cylinder and shaft seal housing, sealing structure is above-mentioned sealing structure.
Sealing structure in this utility model is seal ring structure, and its sealing ring body includes the first flange being arranged concentrically
Portion and the second flange portion, the first flange portion and the second flange portion are connected by elastic joint part.By the first flange portion and steam turbine
Low pressure (LP) cylinder connect, the second flange portion is connected with bearing body, when producing relative swell increment between low pressure (LP) cylinder and bearing body,
Elastic joint part expands deformation, and then buffers this demi-inflation amount, thus prevents this seal structure damage, it is ensured that steam turbine
Sealing property.
Accompanying drawing explanation
The Figure of description of the part constituting the application is used for providing being further appreciated by of the present utility model, this practicality
Novel schematic description and description is used for explaining this utility model, is not intended that improper restriction of the present utility model.
In the accompanying drawings:
Fig. 1 shows the structural representation of the embodiment according to sealing structure of the present utility model；
Fig. 2 shows the A-A sectional view of the sealing structure in Fig. 1；
Fig. 3 shows the structural representation of the first hemizonid in Fig. 1；And
Fig. 4 shows the structural representation of the second hemizonid in Fig. 1.
Wherein, above-mentioned accompanying drawing includes the following drawings labelling:
10, sealing ring body；11, the first flange portion；12, the second flange portion；13, elastic joint part；14, the first semi-ring
Body；141, the first fastening block；142, detent；15, the second hemizonid；151, the second fastening block；152, positioning convex；20、
Fastening bolt.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases
Combination mutually.Describe this utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Present embodiments providing a kind of sealing structure, refer to Fig. 1 to Fig. 4, this sealing structure includes sealing ring body 10,
Sealing ring body 10 includes the first flange portion 11 and the second flange portion 12 being arranged concentrically, the first flange portion 11 and the second flange portion
12 are connected by elastic joint part 13.
Sealing structure in the present embodiment is seal ring structure, and its sealing ring body includes the first flange portion being arranged concentrically
11 and second flange portion 12, the first flange portion 11 and the second flange portion 12 are connected by elastic joint part 13.By the first flange portion
11 are connected with the low pressure (LP) cylinder of steam turbine, the second flange portion 12 are connected with bearing body, produce phase between low pressure (LP) cylinder and bearing body
To swell increment time, elastic joint part 13 expands deformation, and then buffers this demi-inflation amount, thus prevents this sealing structure
Damage, it is ensured that the sealing property of steam turbine.
In order to make this elastic joint part 13 have elasticity, the first flange portion 11 is positioned at the outside of the second flange portion 12, elastic
Being provided with elastic groove on connecting portion 13, elastic groove is arranged around the second flange portion 12.By arranging elastic groove, this elasticity can be made
Connecting portion 13 is susceptible to elastic deformation, and then makes this elastic joint part 13 have elasticity.
Specifically, as in figure 2 it is shown, the cross section of elastic joint part 13 is U-shaped, one end of the peristome of elastic joint part 13
Being connected with the first flange portion 11, the other end and second flange portion 12 of the peristome of elastic joint part 13 connect.So, by elasticity
Connecting portion 13 is set to U-shape structure, just can make full use of the elasticity of this elastic joint part 13 to prevent this seal structure damage.
For the ease of the installation of sealing ring body 10, sealing ring body 10 includes the segmental arc that multiple head and the tail connect successively.
Specifically, as it is shown in figure 1, sealing ring body 10 includes the first hemizonid 14 and the second hemizonid 15, the first semi-ring
Body 14 docks mutually with the second hemizonid 15；The first half flanges that first flange portion 11 includes docking mutually and the second half flanges, second
Flange portion 12 includes the 3rd half flange and the 4th half flange docked mutually, and the first half flanges and the 3rd half flange are arranged at first
On hemizonid 14, the second half flanges and the 4th half flange are arranged on the second hemizonid 15.
Visible, the first flange portion 11 and the second flange portion 12 are each split into two and half flanges, so, the two of each flange portion
Individual part is separately positioned on corresponding hemizonid, and so, after two hemizonid splicings, each flange portion also realizes splicing, enters
And realize the assembling of this sealing ring body 10.
In order to realize the connection of two hemizonids, the end of the first hemizonid 14 and the end of the second hemizonid 15 are by tight
Fixing bolt 20 connects.
Owing to directly fastening bolt 20 to be plugged in the difficulty of the ring body end of the first hemizonid 14 and the second hemizonid 15
Relatively big, then, the end of the first hemizonid 14 is provided with the first fastening block 141, and the second hemizonid 15 is provided with the second fastening
Block 151, fastening bolt 20 is located on the first fastening block 141 and the second fastening block 151.
In order to ensure the locating effect between the first hemizonid 14 and the second hemizonid 15, the end of the first hemizonid 14 sets
Being equipped with detent 142, the end of the second hemizonid 15 is provided with positioning convex 152, and positioning convex 152 is plugged in detent
In 142.
Specifically, as shown in Figure 3 and Figure 4, detent 142 includes the first straight-line groove, the second straight-line groove and connects first
Straight-line groove and the U-lag of the second straight-line groove, the first straight-line groove is arranged in the first flange portion 11, and the second straight-line groove is arranged on second
In flange portion 12, U-lag is arranged on elastic joint part 13；The shape of positioning convex 152 and the matching form of detent 142
Close.
The design of the U-lag in the present embodiment is the structure in order to coordinate elastic joint part 13, when elastic joint part 13 is
During other structures, this U-lag can also be transformed into other shape.
The present embodiment additionally provides a kind of steam turbine, including low pressure (LP) cylinder, shaft seal housing and connect the close of low pressure (LP) cylinder and shaft seal housing
Seal structure, sealing structure is above-mentioned sealing structure.
Steam turbine in the present embodiment, is in the case of equipment is not done big change, the connection low pressure to steam turbine
Sealing structure between cylinder and shaft seal housing is transformed, and uses split type expansion loop to seal, and it is sealed structure and transforms, carry
The vacuum of high unit.
The present embodiment uses the U-shaped expansion loop of two halves formula, seals between low pressure (LP) cylinder and shaft seal housing, can make unit
Vacuum tightness is down to 130Pa/min, and at shaft seal housing sealing, less than 2.0 × 10-9mbar.l/s, (millibar rises often air leakage quantity
Second).
In the case of the low pressure (LP) cylinder of steam turbine and shaft seal housing not being done big change, and ensureing that unit safety is stably transported
On the premise of row, the rubber "O"-ring using Split type U-shaped expansion loop to substitute between low pressure (LP) cylinder and the shaft seal housing of steam turbine is carried out
Seal.
After sealing structure in this enforcement is implemented, while ensureing Turbine Safety stable operation, improve steam turbine
The vacuum tightness of group, improves unit vacuum, meets the condition of unit in summer oepration at full load, reduce gross coal consumption rate,
Reduce the consumption rate of air cooling blower fan, meet national energy-saving and reduce discharging policy.
Meanwhile, this technology can be promoted at similar unit, solves the defect on similar unit design, has good
Economic benefit and social benefit.
The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for this
For the technical staff in field, this utility model can have various modifications and variations.All in spirit of the present utility model and principle
Within, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (10)
1. seal a structure, including sealing ring body (10), it is characterised in that described sealing ring body (10) includes setting with one heart
The first flange portion (11) put and the second flange portion (12), described first flange portion (11) and described second flange portion (12) are passed through
Elastic joint part (13) connects.
Sealing structure the most according to claim 1, it is characterised in that described first flange portion (11) is positioned at described second method
The outside in orchid portion (12), described elastic joint part (13) is provided with elastic groove, and described elastic groove is around described second flange portion
(12) arrange.
Sealing structure the most according to claim 1 and 2, it is characterised in that the cross section of described elastic joint part (13) is U
Shape, one end of the peristome of described elastic joint part (13) is connected with described first flange portion (11), described elastic joint part
(13) other end of peristome is connected with described second flange portion (12).
Sealing structure the most according to claim 1, it is characterised in that described sealing ring body (10) includes that multiple head and the tail depend on
The secondary segmental arc connected.
Sealing structure the most according to claim 1, it is characterised in that described sealing ring body (10) includes the first hemizonid
(14) and the second hemizonid (15), described first hemizonid (14) is docked mutually with described second hemizonid (15)；Described first method
The first half flanges that orchid portion (11) includes docking mutually and the second half flanges, described second flange portion (12) includes the 3rd docked mutually
Half flange and the 4th half flange, described the first half flanges and described 3rd half flange are arranged at described first hemizonid (14)
On, described the second half flanges and the 4th half flange are arranged on described second hemizonid (15).
Sealing structure the most according to claim 5, it is characterised in that the end of described first hemizonid (14) and described the
The end of two hemizonids (15) is connected by fastening bolt (20).
Sealing structure the most according to claim 6, it is characterised in that the end of described first hemizonid (14) is provided with
One fastening block (141), described second hemizonid (15) is provided with the second fastening block (151), and described fastening bolt (20) wears
On described first fastening block (141) and described second fastening block (151).
Sealing structure the most according to claim 5, it is characterised in that the end of described first hemizonid (14) is provided with fixed
Position groove (142), the end of described second hemizonid (15) is provided with positioning convex (152), and described positioning convex (152) plugs
In described detent (142).
Sealing structure the most according to claim 8, it is characterised in that described detent (142) include the first straight-line groove,
Second straight-line groove and connect described first straight-line groove and the U-lag of described second straight-line groove, described first straight-line groove is arranged on institute
Stating in the first flange portion (11), described second straight-line groove is arranged on described second flange portion (12), and described U-lag is arranged on institute
State on elastic joint part (13)；The matching form of the shape of described positioning convex (152) and described detent (142) closes.
10. a steam turbine, including low pressure (LP) cylinder, shaft seal housing and the sealing structure connecting described low pressure (LP) cylinder and described shaft seal housing, its
Being characterised by, described sealing structure is the sealing structure according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620620009.7U CN205744001U (en) | 2016-06-21 | 2016-06-21 | Seal structure and there is its steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620620009.7U CN205744001U (en) | 2016-06-21 | 2016-06-21 | Seal structure and there is its steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205744001U true CN205744001U (en) | 2016-11-30 |
Family
ID=57383799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620620009.7U Active CN205744001U (en) | 2016-06-21 | 2016-06-21 | Seal structure and there is its steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205744001U (en) |
-
2016
- 2016-06-21 CN CN201620620009.7U patent/CN205744001U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |