CN102720545A - Durable steam sealing structure of steam turbine - Google Patents
Durable steam sealing structure of steam turbine Download PDFInfo
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- CN102720545A CN102720545A CN2012102166515A CN201210216651A CN102720545A CN 102720545 A CN102720545 A CN 102720545A CN 2012102166515 A CN2012102166515 A CN 2012102166515A CN 201210216651 A CN201210216651 A CN 201210216651A CN 102720545 A CN102720545 A CN 102720545A
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Abstract
The invention provides a durable steam seal structure of a steam turbine, comprising a clapboard, a steam seal, axial springs and radial springs, wherein a steam seal groove is processed on the clapboard; the steam seal is installed in the steam seal groove; the steam seal and a moving blade shroud ring form a seal structure; and the steam seal groove is an eccentric T-shaped steam seal groove. The durable steam seal structure of the steam turbine can reduce the steam linkage of the steam seal of the steam turbine, improve the cylinder efficiency, and increase the operation safety of units.
Description
Technical field
The present invention directly applies to the newly-built steam turbine set of various capacity and saves energy and reduce the cost, increases on the steam turbine reformation project of unit output.
Background technique
The fixing tooth packing that domestic existing turbine steam seal structure is a traditional form or the made a concession formula packing of traditional form; This packing is in steam turbine startup or stopping process; Vibration is very big when turbine rotor reaches critical speed of rotation, causes packing heavy wear, and the labyrinth clearance increases; Cylinder efficient reduces, and influences unit safety operation simultaneously.For fear of bumping mill, must not uncomfortable big packing radial clearance when Design of Steam Turbine and assembling, prolong unit starting or dead time simultaneously.But the packing wearing and tearing just take place when in fact starting for the first time after the overhaul, and unit is actually operation under big labyrinth clearance for a long time, and steam leakage is serious, and unit efficiency reduces; Packing weares and teares even possibly cause permanent bending of rotor and unit abnormal vibrations, influences the Security and the Economy of unit.
Summary of the invention
Leak vapour for reducing turbine steam seal, improve cylinder efficient, increase the Security of unit operation, steam turbine can use the permanent seal cooling gland seal structure.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of permanent seal cooling turbine steam seal structure comprises dividing plate, packing, axle spring, radial spring, is processed with the packing groove on the dividing plate, and packing is installed in the packing groove, and packing and moving blade ' s shroud band form sealing configuration, and the packing groove is eccentric T type packing groove.Cut into 12 segmental arcs after the whole circle processing of packing, each segmental arc junction plane cuts into the ladder-type structure.In N radial spring hole of the radial position of each packing segmental arc upper edge steam admission side processing, N radial spring is installed, N is more than or equal to 2, and N is according to the difference of front and back, mounting point pressure reduction and difference.Above the radial spring hole, be processed with tapped hole, the adjustment screw is located in the tapped hole, and the radial spring top links to each other with the adjustment screw, and the adjustment screw can accurately be adjusted radial spring elastic force.Be designed with logical vapour groove at the packing steam admission side.The axial clearance of spacing position is 0.3-1.5mm between packing groove and packing.Because the effect of axle spring, the axial clearance of spacing position can be amplified to 1mm between packing groove and packing.In M axle spring hole of the axial position of each packing segmental arc upper edge steam admission side processing, an installing M axle spring, M be more than or equal to 2, according to the difference of front and back, mounting point pressure reduction and difference.
The invention has the beneficial effects as follows, in steam turbine startup or stopping process, under the spring force effect, keep big radial clearance between packing and the moving blade ' s shroud band, avoid damaging moving blade ' s shroud band.Each packing segmental arc junction plane cuts into the ladder-type structure, has avoided the leakage vapour phenomenon between the packing segmental arc in startup or the stopping process.When steam turbine normally moves, under the effect of vapor pressure, overcome spring force, the packing radial clearance is contracted to design load, leaks vapour in the stage and reduces, and steam turbine cylinder efficient improves.Adopt this permanent seal cooling turbine steam seal structure to solve the bite that causes because of packing segmental arc distortion and fouling fully and lost efficacy, and reduced because of partial spring the lost efficacy unit vibration that causes and the possibility of Steam loss increase.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is structure of the present invention and the state of packing when unit starting or shutdown.
Fig. 2 is the state of the present invention when unit normally moves.
Fig. 3 is that axle spring of the present invention is arranged schematic representation.
Fig. 4 is the logical vapour groove schematic representation of the present invention.
Fig. 5 is a ladder-type cutting structure schematic representation between packing segmental arc of the present invention.
1. eccentric T type packing grooves among the figure, 2. permanent seal cooling packing, 3. adjustment screw, 4. radial spring, 5. dividing plate, 6. logical vapour groove, 7. moving blade ' s shroud band, 8. axle spring, 9. ladder-type cutting structure.
Embodiment
The present invention is when on the steam turbine project that is used in new power plant construction, and gland seal structure can directly be designed to the permanent seal cooling gland seal structure; In the time of on being used in the steam turbine reformation project, behind the buying blank, utilize machined into permanent seal cooling 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; Inner casing or diaphragm housing ring are returned job shop, former packing groove is replenished be processed into eccentric T type packing groove structure, the permanent seal cooling packing is installed.
Permanent seal cooling turbine steam seal structure, can be applied to the newly-built steam turbine set of various capacity and energy-saving and cost-reducing, increase in the steam turbine reformation project of unit output.Cut into 12 segmental arcs after the whole circle processing of packing, each packing segmental arc junction plane cuts into the ladder-type structure, has avoided the leakage vapour phenomenon between the packing segmental arc in startup or the stopping process.N radial spring hole of radial position processing at each packing segmental arc upper edge steam admission side; Above the radial spring hole, be processed with tapped hole; The adjustment screw is located in the tapped hole; Radial spring is installed in the radial spring hole, and its top links to each other with the adjustment screw, and the adjustment screw can accurately be adjusted radial spring elastic force.The quantity of radial spring is N, and N is more than or equal to 2, and N is according to the difference of pressure reduction before and after the mounting point and difference.This kind spring mounting type can be controlled each packing segmental arc separately, effectively avoids the packing large size paralysis of losing efficacy and causing because of partial spring; The effect of radial spring is at unit starting or keeps big radial clearance between packing and moving blade ' s shroud band because the effect of spring force makes when shutting down, and prevents to bump mill, has deformability when grinding when packing and moving blade ' s shroud band bump.Steam admission side in the packing segmental arc is designed with logical vapour groove, when unit normally moves, because steam admission side steam is gone into the packing back through logical vapour concentrated flow, overcomes the spring force effect, and packing is pressed to moving blade ' s shroud band, makes radial clearance be reduced into less design load automatically.Each packing segmental arc steam admission side is arranged M axle spring, and M is more than or equal to 2, according to the difference of front and back, mounting point pressure reduction and difference.The effect of axle spring is that packing is pressed to steam output side, thereby can the axial clearance C of spacing position between packing groove and packing be amplified to 1mm, avoids the packing bite phenomenon that causes because of reasons such as packing segmental arc and dividing plate distortion.Packing and moving blade ' s shroud band form sealing configuration.
In the embodiment shown in fig. 1, the packing groove of dividing plate (5) is processed into eccentric T type packing groove (1) structure, permanent seal cooling packing (2) is installed, the elastic force of adjusting radial spring (4) through adjustment screw (3) is to reach designing requirement.Logical vapour groove (6) is in the steam admission side direction, and when steam turbine startup or shutdown, permanent seal cooling packing (2) keeps radial clearance A1, B1 greatly with moving blade ' s shroud band (7), avoids bumping mill with moving blade ' s shroud band; Each packing segmental arc is arranged the axle spring (8) of some vertically; Thereby can suitably amplify the axial clearance between eccentric T type packing groove (1) and permanent seal cooling packing (2), avoid the packing bite phenomenon that causes because of the distortion of permanent seal cooling packing (2) and dividing plate (5); Permanent seal cooling packing segmental arc junction plane cuts into ladder-type cutting structure (9), has avoided the leakage vapour phenomenon between the packing segmental arc in startup or the stopping process.
In embodiment illustrated in fig. 2; Transform on-the-spot with permanent seal cooling packing (2) and moving blade ' s shroud band (7) radial clearance A, B repair to design load; Permanent seal cooling packing (2) keeps less radial clearance A, B with moving blade ' s shroud band (7) when operation, effectively reduces the gland leak-off amount, raises the efficiency.
In the embodiment shown in fig. 3; The scene of transformation is installed on axle spring (8) in the axle spring hole; The effect of axle spring (8) is that permanent seal cooling packing (2) is pressed to steam output side; Thereby can the axial clearance C of spacing position between eccentric T type packing groove (1) and permanent seal cooling packing (2) be amplified to 1mm, avoid the bite phenomenon that causes because of reasons such as permanent seal cooling packing (2) and dividing plate (5) distortion.
In the embodiment shown in fig. 4; The effect of logical vapour groove (6) is when unit normally moves; Because steam admission side steam flows into permanent seal cooling packing (2) back through logical vapour groove (6); Overcome the elastic force effect of radial spring (4), permanent seal cooling packing (2) is pressed to moving blade ' s shroud band (7), make radial clearance A, B be reduced into less design load automatically.
In the embodiment shown in fig. 5, ladder-type cutting structure (9) has been avoided the leakage vapour phenomenon between permanent seal cooling packing (2) segmental arc in startup or the stopping process.
Claims (9)
1. a permanent seal cooling turbine steam seal structure comprises dividing plate, packing, axle spring, radial spring, it is characterized in that: be processed with the packing groove on the dividing plate, packing is installed in the packing groove, and packing and moving blade ' s shroud band form sealing configuration.
2. steam turbine permanent seal cooling gland seal structure according to claim 1 is characterized in that: the packing groove is eccentric T type packing groove.
3. steam turbine permanent seal cooling gland seal structure according to claim 2 is characterized in that: cut into 12 segmental arcs after the whole circle processing of packing, each segmental arc junction plane cuts into the ladder-type structure.
4. steam turbine permanent seal cooling gland seal structure according to claim 3; It is characterized in that: in N radial spring hole of radial position processing of each packing segmental arc upper edge steam admission side; N radial spring is installed, and N is more than or equal to 2, and N is according to the difference of pressure reduction before and after the mounting point and difference.
5. steam turbine permanent seal cooling gland seal structure according to claim 4; It is characterized in that: above the radial spring hole, be processed with tapped hole; The adjustment screw is located in the tapped hole, and the radial spring top links to each other with the adjustment screw, and the adjustment screw can accurately be adjusted radial spring elastic force.
6.6. turbine steam seal structure according to claim 5 is characterized in that: be designed with logical vapour groove at the packing steam admission side.
7. turbine steam seal structure according to claim 6 is characterized in that: the axial clearance of spacing position is 0.3-1.5mm between packing groove and packing.
8. turbine steam seal structure according to claim 7 is characterized in that: because the effect of axle spring, the axial clearance of spacing position can be amplified to 1mm between packing groove and packing.
9. according to the described turbine steam seal structure of above-mentioned arbitrary claim; It is characterized in that: in M axle spring hole of axial position processing of each packing segmental arc upper edge steam admission side; An installing M axle spring, M be more than or equal to 2, according to the difference of pressure reduction before and after the mounting point and difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102166515A CN102720545A (en) | 2012-06-28 | 2012-06-28 | Durable steam sealing structure of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102166515A CN102720545A (en) | 2012-06-28 | 2012-06-28 | Durable steam sealing structure of steam turbine |
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| CN102720545A true CN102720545A (en) | 2012-10-10 |
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| CN2012102166515A Pending CN102720545A (en) | 2012-06-28 | 2012-06-28 | Durable steam sealing structure of steam turbine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644000A (en) * | 2013-12-19 | 2014-03-19 | 东方电气集团东方汽轮机有限公司 | Steam seal structure between stator components of steam turbine |
| CN106703900A (en) * | 2015-11-16 | 2017-05-24 | 广州市智伟电力科技开发有限公司 | Novel self-adjustment spring type steam seal |
| CN112664276A (en) * | 2020-12-09 | 2021-04-16 | 东方电气集团东方汽轮机有限公司 | Moving blade structure of high-rotating-speed steam turbine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002364308A (en) * | 2001-06-04 | 2002-12-18 | Mitsubishi Heavy Ind Ltd | Automatic adjusting seal of turbine |
| CN101070912A (en) * | 2006-05-08 | 2007-11-14 | 通用电气公司 | Tension spring actuators for variable clearance positive pressure packings for steam turbines |
| DE102009003423A1 (en) * | 2008-02-04 | 2009-08-06 | General Electric Co. | Retractable elastic plate seals |
| US20100239414A1 (en) * | 2009-03-23 | 2010-09-23 | General Electric Company | Apparatus for turbine engine cooling air management |
| CN202081919U (en) * | 2011-05-18 | 2011-12-21 | 北京龙威发电技术有限公司 | Steam seal structure of 300MW steam turbine |
| CN202732000U (en) * | 2012-06-28 | 2013-02-13 | 北京龙威发电技术有限公司 | Durable type steam seal structure of steam turbine |
-
2012
- 2012-06-28 CN CN2012102166515A patent/CN102720545A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002364308A (en) * | 2001-06-04 | 2002-12-18 | Mitsubishi Heavy Ind Ltd | Automatic adjusting seal of turbine |
| CN101070912A (en) * | 2006-05-08 | 2007-11-14 | 通用电气公司 | Tension spring actuators for variable clearance positive pressure packings for steam turbines |
| DE102009003423A1 (en) * | 2008-02-04 | 2009-08-06 | General Electric Co. | Retractable elastic plate seals |
| US20100239414A1 (en) * | 2009-03-23 | 2010-09-23 | General Electric Company | Apparatus for turbine engine cooling air management |
| CN202081919U (en) * | 2011-05-18 | 2011-12-21 | 北京龙威发电技术有限公司 | Steam seal structure of 300MW steam turbine |
| CN202732000U (en) * | 2012-06-28 | 2013-02-13 | 北京龙威发电技术有限公司 | Durable type steam seal structure of steam turbine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644000A (en) * | 2013-12-19 | 2014-03-19 | 东方电气集团东方汽轮机有限公司 | Steam seal structure between stator components of steam turbine |
| CN103644000B (en) * | 2013-12-19 | 2015-07-29 | 东方电气集团东方汽轮机有限公司 | Gland seal structure between a kind of steam turbine stator part |
| CN106703900A (en) * | 2015-11-16 | 2017-05-24 | 广州市智伟电力科技开发有限公司 | Novel self-adjustment spring type steam seal |
| CN112664276A (en) * | 2020-12-09 | 2021-04-16 | 东方电气集团东方汽轮机有限公司 | Moving blade structure of high-rotating-speed steam turbine |
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Application publication date: 20121010 |