CN201851169U - Novel low-pressure stage straight-welding type static blade separating plate for steam turbine - Google Patents
Novel low-pressure stage straight-welding type static blade separating plate for steam turbine Download PDFInfo
- Publication number
- CN201851169U CN201851169U CN2010206085759U CN201020608575U CN201851169U CN 201851169 U CN201851169 U CN 201851169U CN 2010206085759 U CN2010206085759 U CN 2010206085759U CN 201020608575 U CN201020608575 U CN 201020608575U CN 201851169 U CN201851169 U CN 201851169U
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- dividing plate
- stator blade
- separating plate
- blade
- steam turbine
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Abstract
The utility model relates to a novel low-pressure stage straight-welding type static blade separating plate for a steam turbine, which has the advantages of high strength, simple structure and general generality. Compared with the traditional low-pressure stage casting separating plate applied to the steam turbine, the static blade welding separating plate adopting the structure is higher than the steam outlet side of the static blade of the casing separating plate in the position; the surface roughness of a static blade lattice runner is smaller and blade lattices are more uniformly distributed along the direction of the circumference. The novel low-pressure stage straight-welding type static blade separating plate mainly comprises a separating plate body, a separating plate inner ring cylinder body, the static blade and a separating plate outer ring; the separating plate body is separated from the separating plate inner ring cylinder body; the separating plate body and the separating body inner ring cylinder body form a T-shaped structure and are directly welded and connected; and the static blade is directly welded and connected with the separating plate outer ring or the separating plate inner ring.
Description
Technical field
The utility model relates to a kind of steam turbine welding diaphragm, is specially adapted to the novel low pressure stage directly welded of the steam turbine stator blade dividing plate of impulse steam turbine.
Background technique
Steam turbine can be divided into impulse and reaction turbine according to working principle.Impulse steam turbine is the barrier type structure, and the fixedly dividing plate of stator blade and the diaphragm housing ring of supported diaphragm are arranged on the cylinder.Dividing plate is used for fixing steam turbine stator blade at different levels, and forms the separation partition of steam turbine between at different levels.Consider easy installation and removal, the dividing plate split is made branch form in the level.
According to operating temperature and the vapor tension extent that dividing plate bore, dividing plate has welding diaphragm and cast-in diaphragm two big classes usually.Welding diaphragm is that stator blade is at first connect with the inner peripheral tape welding, with the welding of partition body and outer shroud, has higher strength and stiffness again, steam tightness preferably, and meridian plane is smooth, and supplementary loss is little, so be widely used in steam turbine height, the intermediate pressure section of middle high parameter.Cast-in diaphragm is that the stator blade of machine shaping is cast into when the casting dividing plate simultaneously, in order to obtain casting performance and mechanical property preferably, partition body generally adopts spheroidal graphite cast iron or alloy cast iron, this dividing plate manufacturing ratio is easier to, cost is low, but the surface roughness of stator blade is higher, and supplementary loss is big, serviceability temperature generally is lower than 350 ℃, is used for the low-pressure section of steam turbine.
Summary of the invention
The utility model provides a kind of high strength, the novel low pressure stage directly welded of steam turbine simple in structure, highly versatile stator blade dividing plate at existing low-pressure stage of steam turbine cast-in diaphragm assembling processing and problems occured in operation.With respect to traditional cast-in diaphragm that is applied to low-pressure stage of steam turbine, the stator blade welding diaphragm that adopts this structure is than cast-in diaphragm stator blade lagging edge position Du Genggao, and static cascade water passage surface roughness is littler, and leaf grating along the circumferential direction is more evenly distributed.
The purpose of this utility model realizes by the following technical solutions:
The novel low pressure stage directly welded of a kind of steam turbine stator blade dividing plate, it mainly is made up of partition body, dividing plate endocyclic tube body, stator blade and dividing plate outer shroud, described partition body and dividing plate endocyclic tube body are split type, and partition body becomes T shape structure with dividing plate endocyclic tube body, and both directly are welded to connect; Ring also is directly to be welded to connect in stator blade and dividing plate outer shroud and the dividing plate.
Described dividing plate outer shroud is the cast steel casting, its inner ring surface accurate die casting.
Described stator blade is the bending linear leaf.
Described stator blade leaf top and blade root are offered bevel for welding, and only offer in blade convexity face side.
Described bevel for welding is held setting along stator blade admission stub end to going out the vapour microcephaly, and its width is 10～12mm; The angle of bevel for welding and dividing plate outer shroud and dividing plate endocyclic tube surface is in 60～70 degree scopes.
Described bevel for welding goes out the vapour microcephaly apart from stator blade and holds end-to-end distance from being not less than 10～12mm, simultaneously near the back of the body arc place bevel for welding of lagging edge to the minimum range of blade concavity greater than 1mm.
The utility model mainly is made up of partition body, dividing plate endocyclic tube body, stator blade and dividing plate outer shroud.The required flow area of low-pressure stage of steam turbine steam is big, pitch circle height height, so the dividing plate outer shroud adopts the cast steel casting, its inner ring surface accurate die casting guarantees the surface finishment of meridian plane expansionary channel.
In order to reduce owing to of the influence of blade main weld welding deformation to the dividing plate assembly precision, different with ring partition body in the tradition, the interior ring that the utility model directly welds dividing plate is a split-type structural, partition body adopts the oxygen-acetylene cutting of hot rolling carbon constructional steel plate, and dividing plate endocyclic tube body adopts hot rolling carbon constructional steel plate bending and molding.Partition body and the "T"-shaped structure of dividing plate endocyclic tube body are welded with the main weld fusion welding metal, have improved the bulk strength performance every integral body.
Because the low-pressure stage of steam turbine flow area is big, flow of steam is big along the high variation of leaf, so stator blade is the bending linear leaf, in order to improve the welding performance of blade and dividing plate outer shroud and dividing plate endocyclic tube body, offer bevel for welding on stator blade leaf top and blade root, and only offer in blade convexity face side.In, utilize carbon steel scolder J422 to carry out fillet welding between the back of the body arc both sides blade and partition body, postwelding is polished to fillet radius 6～10mm.According to the pattern and the thickness of blade, guarantee the integrity of blade on the one hand, improve weld strength on the other hand, so offer the bevel for welding that groove width is 10～12mm to going out the little head end of vapour along blade admission stub end.The angle of bevel for welding and dividing plate outer shroud and dividing plate endocyclic tube surface is in 60～70 degree scopes.
Because the back edge microcephaly holds thickness less,, do not weld so in distance lagging edge end 10～12mm scope, there is not the welding groove.Bevel for welding near lagging edge in order to guarantee the intensity of blade itself, prevents to puncture in the welding process blade, and requiring to carry on the back arc groove to the minimum range of blade concavity must be greater than 1mm.
Because outer big, the interior ring size of ring size of the dividing plate of low pressure stage is little, stator blade is the bending linear leaf, so it is different that the utility model directly welded stator blade dividing plate and welding diaphragm stator blade that is applied to high pressure stage and inner peripheral tape welding connect, be the structure that adopts stator blade and the direct welding fabrication of dividing plate inside and outside ring.
The beneficial effects of the utility model are: by analyses such as welding procedure test, diaphragm deflection test and practical operation situation, this novel low straightening weldering dividing plate satisfies the steam turbine operation usage requirement, has enough rigidity and intensity, structural manufacturing process is simple, be convenient to operations such as processing, installation, maintenance, have good and economic and stability.
Description of drawings
Fig. 1 is a model utility directly welded stator blade diaphragm structure schematic representation;
Fig. 2 is a model utility directly welded stator blade dividing plate blade root cross section unfolded drawing;
Fig. 3 is a bending stator blade outline drawing;
Fig. 3 a is a bending stator blade outline drawing;
Fig. 4 is a directly welded stator blade dividing plate welded structure X schematic cross-section;
Fig. 4 a is a directly welded stator blade dividing plate welded structure W schematic cross-section;
Fig. 5 is a directly welded stator blade dividing plate welded structure V schematic cross-section;
Fig. 5 a is a directly welded stator blade dividing plate welded structure U schematic cross-section.
Wherein 1, the dividing plate outer shroud, 2, stator blade, 3, dividing plate endocyclic tube body, 4, the main weld fusion welding metal, 5, partition body, 6, blade weld seam fusion welding metal, 7, leaf top solder groove, 8, the blade root bevel for welding, 9, blade face, 10, the blade convexity face
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is this novel welding diaphragm longitudinal section schematic representation.Stator blade 2 directly is welded between dividing plate outer shroud 1 and the dividing plate endocyclic tube body 3, constitutes the runner of steam.Utilize main weld fusion welding metal 4 that dividing plate endocyclic tube body 3 and partition body 5 are connected, constitute stable "T"-shaped structure, guarantee the bulk strength of partition body.
Fig. 2 has shown the unfolded drawing of the stator blade of this novel straight weldering dividing plate along blade root.Stator blade 2 comprises blade face 9 and blade convexity face 10.In order to prevent to puncture blade in the welding process, guarantee the integrity of blade, in distance lagging edge end 10～12mm interval, do not weld.X, W, four cross sections of V, U are bevel for welding and welding line structure control cross section, and it is the uniform arrangement of center line of holding blade along the steam admission side stub end to the steam output side microcephaly.
Fig. 3, Fig. 3 a are the outline drawings of stator blade, and the convex surface of stator blade 2 offers leaf top solder groove 7 and blade root bevel for welding 8.Consider the intensity of blade itself and be convenient to operation, only offer groove at the blade convexity face.
Fig. 4, Fig. 4 a and Fig. 5, Fig. 5 a have shown and have respectively controlled the bevel for welding of section and the structure of fillet welding.The groove width of offering at stator blade 2 back of the body arc blade roots and Ye Dingchu has three groups of different numerical value according to the thickness difference of blade, all in 10～12mm scope.The angle of bevel for welding inclined-plane of offering and dividing plate outer shroud 1 and dividing plate endocyclic tube body 3 guarantees that groove must be greater than 1mm apart from the minimum value of blade face in 60～70 degree scopes.Adopt blade weld seam fusion welding metal 6 that stator blade is connected with dividing plate outer shroud and dividing plate endocyclic tube body, and butt welded seam is polished to knuckle radius 6～10mm.
The embodiment who is applicable to the low-pressure stage of steam turbine welding diaphragm who the utility model proposes is the stator blade directly welded dividing plate that is used for the low pressure stage of ultrahigh pressure and High Temperature High Pressure impulse steam turbine.
Claims (6)
1. the novel low pressure stage directly welded of steam turbine stator blade dividing plate, it mainly is made up of partition body, dividing plate endocyclic tube body, stator blade and dividing plate outer shroud, it is characterized in that, described partition body and dividing plate endocyclic tube body are split type, partition body becomes T shape structure with dividing plate endocyclic tube body, and both directly are welded to connect; Ring also is directly to be welded to connect in stator blade and dividing plate outer shroud and the dividing plate.
2. the novel low pressure stage directly welded of steam turbine as claimed in claim 1 stator blade dividing plate is characterized in that described dividing plate outer shroud is the cast steel casting, its inner ring surface accurate die casting.
3. the novel low pressure stage directly welded of steam turbine as claimed in claim 1 stator blade dividing plate is characterized in that described stator blade is the bending linear leaf.
4. as claim 1 or the novel low pressure stage directly welded of 3 described steam turbine stator blade dividing plate, it is characterized in that described stator blade leaf top and blade root are offered bevel for welding, and only offer in blade convexity face side.
5. the novel low pressure stage directly welded of steam turbine as claimed in claim 4 stator blade dividing plate is characterized in that described bevel for welding is held setting along stator blade admission stub end to going out the vapour microcephaly, and its width is 10～12mm; The angle of bevel for welding and dividing plate outer shroud and dividing plate endocyclic tube surface is in 60～70 degree scopes.
6. the novel low pressure stage directly welded of steam turbine as claimed in claim 4 stator blade dividing plate, it is characterized in that, described bevel for welding goes out the vapour microcephaly apart from stator blade and holds end-to-end distance from being not less than 10～12mm, simultaneously near the back of the body arc place bevel for welding of lagging edge to the minimum range of blade concavity greater than 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206085759U CN201851169U (en) | 2010-11-16 | 2010-11-16 | Novel low-pressure stage straight-welding type static blade separating plate for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206085759U CN201851169U (en) | 2010-11-16 | 2010-11-16 | Novel low-pressure stage straight-welding type static blade separating plate for steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201851169U true CN201851169U (en) | 2011-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206085759U Expired - Lifetime CN201851169U (en) | 2010-11-16 | 2010-11-16 | Novel low-pressure stage straight-welding type static blade separating plate for steam turbine |
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| CN (1) | CN201851169U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437831A (en) * | 2013-08-28 | 2013-12-11 | 国家电网公司 | Steam turbine stator with serpentine channel and steam turbine stator heating and dehumidifying device |
| CN104454028A (en) * | 2014-11-14 | 2015-03-25 | 东方电气集团东方汽轮机有限公司 | Method for improving running efficiency of steam turbine generator unit in heat supply season |
| CN109352132A (en) * | 2018-10-23 | 2019-02-19 | 哈尔滨汽轮机厂有限责任公司 | Control the method that inner and outer ring difference of height deforms after low pressure ring type partition welds |
-
2010
- 2010-11-16 CN CN2010206085759U patent/CN201851169U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437831A (en) * | 2013-08-28 | 2013-12-11 | 国家电网公司 | Steam turbine stator with serpentine channel and steam turbine stator heating and dehumidifying device |
| CN103437831B (en) * | 2013-08-28 | 2015-06-17 | 国家电网公司 | Steam turbine stator with serpentine channel and steam turbine stator heating and dehumidifying device |
| CN104454028A (en) * | 2014-11-14 | 2015-03-25 | 东方电气集团东方汽轮机有限公司 | Method for improving running efficiency of steam turbine generator unit in heat supply season |
| CN109352132A (en) * | 2018-10-23 | 2019-02-19 | 哈尔滨汽轮机厂有限责任公司 | Control the method that inner and outer ring difference of height deforms after low pressure ring type partition welds |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110601 |