CN202081919U - Steam seal structure of 300MW steam turbine - Google Patents
Steam seal structure of 300MW steam turbine Download PDFInfo
- Publication number
- CN202081919U CN202081919U CN2011201583729U CN201120158372U CN202081919U CN 202081919 U CN202081919 U CN 202081919U CN 2011201583729 U CN2011201583729 U CN 2011201583729U CN 201120158372 U CN201120158372 U CN 201120158372U CN 202081919 U CN202081919 U CN 202081919U
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- steam
- steam seal
- concession
- rotor
- turbine
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- Expired - Lifetime
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Abstract
The utility model relates to a steam seal structure of a 300MW steam turbine, which is used for improving the sealing performance of the steam turbine. The technical scheme is as follows: an original blade top steam seal body of a partition plate is removed, the blade top steam seal body is re-designed, a steam seal groove is processed in an inner ring of the blade top steam seal body which is newly designed, a withdrawable steam seal is mounted, a certain number of cylindrical springs are used at the back part for pressing the withdrawable steam seal to a rotor, and a steaming groove is designed on the steam inlet side so as to enable steam on the steam inlet side to flow into the back part of the withdrawable steam seal; and the new blade top steam seal body adopts a certain number of screws and positioning pins for fixing on an outer ring of the partition plate so as to ensure positioning and firm connection between the steam seal body and an outer ring of the partition plate. When the steam turbine works, if the withdrawable steam seal collides with the rotor, free withdrawal can be realized, thereby avoiding damaging the rotor; simultaneously, the radial clearance is reduced, steam leakage in the steam turbine is reduced and the efficiency of the steam turbine is improved. Based on the action principle, the steam seal structure has better sealing performance in comparison with a fixed tooth steam seal.
Description
Affiliated technical field
The utility model directly applies to saving energy and reduce the cost, increasing on the transformation project of unit output of 300MW steam turbine set.
Background technique
Domestic some 300MW steam turbine blade tip seal is the fixing tooth packing of traditional form, and this packing can not be made a concession when unit operation, the abrasion condition that ubiquity is more serious.For fear of wearing and tearing, must not uncomfortable big packing radial clearance in Design of Steam Turbine and when assembling, prolong the unit starting time simultaneously.But wearing and tearing just take place when in fact starting for the first time after the overhaul, unit is actually for a long time and moves under big labyrinth clearance, and steam leakage is serious, and unit efficiency reduces, packing weares and teares even may cause permanent bending of rotor and unit abnormal vibrations, influences the Security of unit.
Summary of the invention
Leak vapour for reducing this type steam turbine blade tip seal, improve cylinder efficient, increase the Security of unit, blade tip seal is transform as can make a concession the formula packing.
The technological scheme that its technical problem that solves the utility model adopts is: a kind of 300MW turbine steam seal structure, be applied to 300MW Saving energy in Steam Turbine consumption reduction, increase in the transformation project of unit output, it is characterized in that: dividing plate prophyll top labyrinth casing car is removed, redesign blade tip seal body, ring processing vapor sealing groove in newly-designed blade tip seal body, installation can be made a concession the formula packing, the back can be made a concession the formula packing with the cylindrical spring of some and be pressed to rotor, and have deformability when itself and rotor collision; Can make a concession the logical vapour groove of formula packing steam admission side design, flow into for steam admission side steam and can make a concession formula packing back; Young leaves top labyrinth casing adopts the screw and the locating stud of some to be fixed on the dividing plate outer shroud, to guarantee the location between labyrinth casing and the dividing plate outer shroud and to be connected firmly.
The beneficial effects of the utility model are when steam turbine is worked, can make a concession the formula packing as bumping with rotor, can freely make a concession, avoid damaging rotor, the while can make a concession the formula packing and the rotor radial gap reduces, leak vapour in the stage and reduce, turbine efficiency improves.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the utility model assembling schematic representation.
Fig. 2 is the logical vapour groove schematic representation of the utility model.
Fig. 3 is the utility model fit up gap schematic representation.
1. dividing plates among the figure, 2. labyrinth casing 3. can be made a concession the formula packing, 4. socket head screw, 5. moving blade ' s shroud band, 6. inner casing or diaphragm housing ring, 7. cylindrical spring, 8. logical vapour groove.
Embodiment
Behind the buying blank, utilize machined into labyrinth casing and can make a concession the formula packing to the drawing design size, portion size needs made allowance, treat that power plant shuts down after, measure relative dimensions, join to process behind the car according to measurement size then and put in place.After power plant shut down, inner casing or diaphragm housing ring returned job shop, and car removes dividing plate prophyll top labyrinth casing, at the dividing plate outer shroud labyrinth casing that newly processes were installed, and installation can be made a concession the formula packing.
In the embodiment shown in fig. 1, dividing plate (1) prophyll top labyrinth casing car is removed, new blade tip seal body (2) is installed, labyrinth casing (2) links to each other with dividing plate (1) by socket head screw (4).Open the packing groove on labyrinth casing (2), can make a concession formula packing (3) and be installed in the packing groove by cylindrical spring (7), logical vapour groove (8) is in the steam admission side direction.Can make a concession formula packing and moving blade ' s shroud band (5) and form sealing configuration.
Logical vapour groove schematic representation of the present utility model is seen Fig. 2.
In the embodiment shown in fig. 3, formula packing and moving blade ' s shroud band radial clearance A, B and axial clearance C, D repair can be made a concession to design load in the transformation scene.
Claims (2)
1. 300MW turbine steam seal structure, it is characterized in that: ring processing vapor sealing groove in the blade tip seal body, the back cylindrical spring of some, packing can freely be made a concession when colliding with rotor, formation can be made a concession the formula packing, the blade tip seal body adopts the screw and the locating stud of some to be fixed on the dividing plate outer shroud, to guarantee the location between labyrinth casing and the dividing plate outer shroud and to be connected firmly.
2. 300MW turbine steam seal structure according to claim 1, it is characterized in that: can make a concession the logical vapour groove of formula packing steam admission side design, flow into for steam admission side steam and can make a concession formula packing back, make its interior external diameter produce pressure reduction, can make a concession the formula packing and press to rotor, reach the radial clearance of design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201583729U CN202081919U (en) | 2011-05-18 | 2011-05-18 | Steam seal structure of 300MW steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201583729U CN202081919U (en) | 2011-05-18 | 2011-05-18 | Steam seal structure of 300MW steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202081919U true CN202081919U (en) | 2011-12-21 |
Family
ID=45342553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201583729U Expired - Lifetime CN202081919U (en) | 2011-05-18 | 2011-05-18 | Steam seal structure of 300MW steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202081919U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720545A (en) * | 2012-06-28 | 2012-10-10 | 北京龙威发电技术有限公司 | Durable steam sealing structure of steam turbine |
-
2011
- 2011-05-18 CN CN2011201583729U patent/CN202081919U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720545A (en) * | 2012-06-28 | 2012-10-10 | 北京龙威发电技术有限公司 | Durable steam sealing structure of steam turbine |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111221 |