CN107780983A - Cylinder structure in a kind of turbine - Google Patents
Cylinder structure in a kind of turbine Download PDFInfo
- Publication number
- CN107780983A CN107780983A CN201710929709.3A CN201710929709A CN107780983A CN 107780983 A CN107780983 A CN 107780983A CN 201710929709 A CN201710929709 A CN 201710929709A CN 107780983 A CN107780983 A CN 107780983A
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- cylinder body
- body section
- inner casing
- cylinder
- stationary vane
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/26—Double casings; Measures against temperature strain in casings
- F01D25/265—Vertically split casings; Clamping arrangements therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/246—Fastening of diaphragms or stator-rings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses cylinder structure in a kind of turbine, including inner casing body, the inner casing body has more than two cylinder type cylinder body sections and some stay-bolts, opened up on the wall thickness circumference of each cylinder body section and be disposed with several bolts hole, and the bolt hole on each cylinder body section circumference corresponds in the axial direction, these cylinder body sections of the inner casing body are sequentially docked in the axial direction, each bolt hole in circumference is set to correspond in the axial direction, each stay-bolt is installed corresponding to the axial direction for being locked at these cylinder body sections in bolt hole, these stay-bolts of the inner casing body are sealed integral by each cylinder body section in the axial direction respectively, form complete cylinder type inner casing.Outside dimension of the invention is small, compact-sized, good seal performance, bearing strength are high, meanwhile, be advantageous to improve sealing and the load performance of matched outer shell, be fully able to the technical requirements for meeting high parameter, especially high-parameter steam turbine.
Description
Technical field
The present invention relates to cylinder structure in turbine.
Background technology
Turbine plant need to rely on the energy conversion that cylinder body carries out fluid media (medium), such as steam turbine.Generally, steam turbine,
Especially the high-pressure section of large-size steam turbine uses double shell structure, i.e., be respectively subjected to fluid media (medium) with inner casing and outer shell one
Partial pressure differential and the temperature difference.It can be seen that inner casing is one of core component of turbine plant-steam turbine.
At present, turbine inner casing mainly has two kinds of structure types.One is horizontal flange closing component structure, i.e., inner casing upper half and
Inner casing lower half by the high-strength bolt on horizontal joint flange with the world to（I.e. upper and lower is to similarly hereinafter）It is sealed integral；
Secondly being shrink ring fastening structure, i.e., the inner casing upper half of semi-circular cylindrical and inner casing lower half are by being sleeved on the shrink ring of outside with day
Ground is to the cylinder type for being tightened to no flange arrangement.In foregoing two kinds of structures, the bearing capacity of the first is worst, second
Better than the first.But cylinder structure can make the exterior contour size of inner casing larger in foregoing two kinds, and then can make to match somebody with somebody therewith
The exterior contour size of the outer shell of set also increases accordingly, in this way, in the case of identical wall thickness and split bolt coupling mechanism force,
The sealability of outer shell can be caused to reduce, sealing reliability is deteriorated, and the pressure difference and the temperature difference that can be born are low.
In recent years, in order to improve the energy conversion efficiency of power station electricity generation system, the main steam condition of power station steam turbine is more next
Higher, the main steam pressure for the supercritical turbine that the country has put into operation has reached 31MPa, main steam temperature also at present
Through reaching 620 DEG C, domestic main steam turbine plant commercial city is just in Devoting Major Efforts To Developing main steam pressure up to the super of 35 MPa and the above
Critical steam turbine.The volume flow of this large-size steam turbine high pressure cylinder is big, plus structure and other limiting factors, its outer shell it is outer
Footpath often more than φ 2000mm, causes the Sealing Technology difficulty of large scale high-pressure cylinder very big, above-mentioned existing turbine inner casing
Structure is difficult to meet the technical requirements of foregoing high-parameter steam turbine high pressure cylinder.
In order to improve the bearing capacity of turbine high-pressure cylinder, there is trial by turbine high-pressure cylinder with axle in the prior art
It is manufactured to the mode of segmentation and bolt combination connection, such as " steam turbine structure " disclosed in Chinese patent literature（Publication number：
The A of CN 102383879, publication date：2012.03.21）, " a kind of cylinder structure of steam turbine "（Publication number：CN 203978525
U, publication date：2014.12.03）Deng.Although these prior arts are by the high-pressure cylinder of steam turbine（Inner casing and/or outer shell）Axially
It is divided into left and right two sections, is then formed by the way that high-strength bolt is axially sealed.However, these prior arts are by the cylinder of axial segmentation
Body carries out the sealed connection of axial direction, and it is necessarily dependent upon on left and right two sections of cylinder body interfaces, footpath convex flange arrangement side
It can realize, the presence of flange arrangement will certainly increase the structural volume of cylinder so that the structural volume of cylinder is not compact enough, and then
Its sealing and bearing strength in use can be reduced, is difficult still to meet that the technology of above-mentioned high-parameter steam turbine high pressure cylinder will
Ask.
The content of the invention
The technical purpose of the present invention is：For above-mentioned the deficiencies in the prior art, there is provided a kind of compact-sized, sealing property
Well, bearing capacity is strong, disclosure satisfy that cylinder structure in the turbine of high parameter technical requirements.
Technical scheme is used by the present invention realizes its technical purpose：Cylinder structure in a kind of turbine, including inner casing body,
The inner casing body has a more than two cylinder type cylinder body sections and some stay-bolts, on the wall thickness circumference of each cylinder body section
Open up and be disposed with several bolts hole, and the bolt hole on each cylinder body section circumference corresponds in the axial direction, the inner casing body
These cylinder body sections sequentially dock in the axial direction, each bolt hole in circumference is corresponded in the axial direction, each stay-bolt is worn
Dress is locked at corresponding to the axial direction of these cylinder body sections in bolt hole, and these stay-bolts difference of the inner casing body is in the axial direction
By sealed integral, the complete cylinder type inner casing of formation of each cylinder body section.
One of preferably, the cylinder body section of the inner casing body is at least according to the corresponding division point of stationary vane assemblies at different levels
Section；Or the cylinder body section of the inner casing body is at least according to stationary vane assemblies at different levels and the corresponding division segmentation of air chamber；The inner casing
The stay-bolt of body axially penetrates out of corresponding bolt hole of the exhaust region and extends to steam admission side locking.
One of preferably, offer mutual correspondence in the interface circumference of the adjacent cylinders section of the inner casing body
Seal groove, be embedded with sealing ring corresponding to mutual in seal groove, the sealing ring keep off be enclosed in adjacent cylinders section axial direction it is right
In junction.Further, the mutual corresponding seal groove on the interface of the adjacent cylinders section is twice, this two seals groove cloth
Put in the bolt hole inner side and outer side of cylinder body section.The sealing ring is the L-type sealing ring of infolding.
One of preferably, the inwall of the cylinder body section is provided with the spacing double wedge of radial protrusion and adjustment double wedge, described
Spacing double wedge is distributed in the left and right sides of horizontal position, correspondingly with the split end of the stationary vane assembly of horizontal flange combination, institute
State adjustment double wedge and be distributed in the top bottom both sides of day status, correspondingly with the top/bottom part of the stationary vane assembly of horizontal flange combination, it is described
The periphery of stationary vane assembly is provided with the embedding slot of corresponding cylinder body section upper raised teeth, and the contour structure of the embedding slot on the stationary vane assembly is big
In the contour structure of the corresponding double wedge in cylinder body section.
One of preferably, the outer end of the stay-bolt is connected with spheric washer component and locking nut.
One of preferably, the center that outer end is provided with axial blind hole shape structure, that heat supply is tight of the stay-bolt
Hole.
One of preferably, the minimum diameter of each cylinder body section of the inner casing body, which is more than, matches rotor assembly
Maximum outside diameter.
The method have the benefit that：
1. divide sealing surface structure invention effectively eliminates in, and without setting flange arrangement on interface, it is circumferentially tied
Structure almost symmetry, so that structural volume densification, and structural stress and thermal stress are small；The present invention with prior art compare and
Speech, in the case of identical Meridian Passage, outside dimension of the invention is small, compact-sized, good seal performance, bearing strength
Height, meanwhile, be advantageous to improve sealing and the load performance of matched outer shell, be fully able to meet high parameter, especially
The technical requirements of high-parameter steam turbine；In addition, each cylinder body section of the present invention can be manufactured using forging so that cylinder body section
Material property can be greatly enhanced, and structure is more simple, light and handy, and sealability and bearing strength obtain further
Effective lifting；
2. the specific segmental structure of cylinder body section of the present invention, it can effectively ensure that stationary vane assembly is simple, light in cylinder body section
Pine, easily assembling, package technique difficulty is reduced, it is workable；In addition, under the auxiliary of double wedge structure in cylinder body section, energy
Enough effectively ensure that assembled stationary vane assembly can be realized in cylinder body section accurately, stably, reliably to assemble；
3. the sealing docking structure between adjacent cylinders section of the present invention, it further can reliably improve the sealing of the present invention
Energy and bearing capacity, it is especially more targeted to the high-pressure area of the present invention；
4. closing component structure of the stay-bolt of the present invention in cylinder body section, it can effectively significantly improve the stress bar of stay-bolt
Part, this especially becomes apparent under the cooperation of hot locking structure, is prominent, and locking force is excellent；
5. the present invention and the corresponding relation between rotor assembly match, can be effectively reduced the present invention and rotor assembly it
Between mounting technology difficulty, it is workable.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present invention.
Fig. 2 is Fig. 1 Section A-A figure.
Fig. 3 is the enlarged drawing of local I in Fig. 1.
Code name implication in figure：1-rotor assembly；2-spacing double wedge；3-air chamber；4-stay-bolt；5-cylinder body section；
6-sealing ring；7-stationary vane assembly；8-seal groove；9-centre bore；10-spheric washer component；11-locking nut；12—
Horizontal flange；13-steam discharge guide ring；14-adjustment double wedge；The maximum outside diameter of R1-rotor assembly；R2-cylinder body section is most
Small internal diameter.
Embodiment
The present invention relates to cylinder structure, especially high parameter in turbine（Such as more than main steam pressure 31MPa, particularly 35
More than MPa, more than 620 DEG C of main steam temperature）The interior cylinder structure of steam turbine.Below with multiple embodiments in the technology of the present invention
Hold and clearly and detailedly illustrated, wherein, embodiment 1 combines Figure of description-i.e. Fig. 1, Fig. 2 and Fig. 3 to technology of the invention
Content progress is detailed, clearly demonstrates, though other embodiments are not drawn individually, its agent structure still can refer to embodiment 1
Accompanying drawing.
Embodiment 1
Referring to shown in Fig. 1, Fig. 2 and Fig. 3, the present invention includes inner casing body, and the inner casing body has multiple Hes of cylinder type cylinder body section 5
Some stay-bolts 4.
Wherein, the cylinder body section 5 of inner casing body is relative position according to stationary vane assemblies 7 at different levels and air chamber 3 and corresponded to
Division segmentation, i.e., inner casing body is divided into multiple cylinder body sections 5 according to stationary vane assemblies 7 at different levels, while by first stage stator blades component pair
The cylinder body section answered and air chamber 3 separate（Special instruction, in broad terms, air chamber 3 is also a cylinder body section, herein in order to clear
Chu is described, and air chamber 3 is separately arranged）, the corresponding installation one-level stationary vane assembly 7 of each cylinder body section 5.The wall thickness of foregoing each cylinder body section 5
Opened up on circumference and be disposed with several bolts hole（Specially install the through-hole structure of stay-bolt）, while the wall thickness of air chamber 3
Also opened up on circumference and be disposed with several bolts hole（Specially lock the studding structure of stay-bolt）, and each circumference of cylinder body section 5
On bolt hole correspond in the axial direction, and the bolt hole on the bolt hole on the circumference of air chamber 3 and the circumference of cylinder body section 5 is in axle
Also correspond upwards.
Due to the corresponding stationary vane assemblies 7 at different levels of above-mentioned each cylinder body section 5, it is necessary to stator blade corresponding to being installed in each cylinder body section 5
Component 7；It is quiet per one-level in order to facilitate the installation of stationary vane assembly 7 again due to the cylinder type that above-mentioned each cylinder body section 5 is ring-type
Leaf component is divided into upper and lower two halves, has horizontal flange 12 between the stationary vane assembly of upper and lower two halves.Thus, above-mentioned each cylinder body
The inwall of section 5 is provided with corresponding one-level stationary vane assembly halfbody, radial protrusion spacing double wedge 2 and adjustment double wedge 14；Spacing double wedge 2
The arranged on left and right sides of horizontal position is distributed in, i.e. spacing double wedge 2 corresponding to stationary vane assembly upper half/lower half is two, and they are distributed in
Near upper and lower half horizontal flange 12 of stationary vane assembly（Certainly, should be close to the side of corresponding halfbody）, so that spacing double wedge 2
The split end of the corresponding stationary vane assembly 7 combined with horizontal flange 12；Adjustment double wedge 14 is distributed in the upper and lower of a day status-i.e.
To top side/bottom side, i.e., the adjustment double wedge 14 corresponding to stationary vane assembly upper half/lower half be one, it is distributed on stationary vane assembly
Half/top of lower half-is in the top side or bottom side of the inwall of cylinder body section 5, so that adjustment double wedge 14 is corresponding with horizontal flange
Top/bottom of the stationary vane assembly 7 of 12 combinations.This mounting structure based on cylinder body section 5, the periphery of corresponding stationary vane assembly 7 are provided with
The embedding slot of the corresponding upper raised teeth of cylinder body section 5, specifically, the periphery both ends end of the upper half of stationary vane assembly 7 has two corresponding limits
The embedding slot of position double wedge 2, periphery top have a corresponding embedding slot for adjusting double wedge 14, the periphery two of the lower half of stationary vane assembly 7
Hold the embedding slot of embedding slot of the end with the spacing double wedge 2 of two correspondences, periphery bottom with a corresponding adjustment double wedge 14；
The internal diameter of embedding slot on stationary vane assembly 7 should be slightly bigger than the internal diameter of the loading end of cylinder body section 5, ensure the stator blade that is assembled together with this
There is certain radial seal width between component 7 and cylinder body section 5.With such assembling structure, stationary vane assemblies 7 at different levels are assemblied in pair
In the cylinder body section 5 answered, the halfbody of the corresponding stationary vane assembly 7 of spacing double wedge 2, suspension, supporting role are played, adjusts 14 corresponding stator blade of double wedge
The halfbody of component 7, play a part of to adjust left and right position.
Order is docked in the axial direction for above-mentioned each cylinder body section 5 and air chamber 3 with corresponding stationary vane assembly 7, makes them circumferential
On each bolt hole correspond in the axial direction, be connected with steam discharge guide ring 13 at final stage cylinder body section.In order to ensure they are in axle
To the sealing of docking, opened up in the interface circumference for the adjacent cylinders section 5 being in the high-pressure area of formed inner casing body
There is mutually corresponding seal groove 8, specifically, air chamber is mutually corresponding with circumferentially being offered on the interface of first order cylinder body section
Seal groove（During the interface fitting of the two, mutually corresponding seal groove forms a complete closure gasket groove）, first order cylinder body
Section is with circumferentially offering mutual corresponding seal groove on the interface of second level cylinder body section, by that analogy；In order to further carry
High sealing effect, the mutual corresponding seal groove 8 on the interface of adjacent cylinders section 5 is twice, and this two seals groove 8 is arranged in cylinder
The bolt hole inner side and outer side of body section 5, i.e., for mutually corresponding seal groove 8 on the inside of the bolt hole of cylinder body section 5, another road is mutual together
Corresponding seal groove 8 is on the outside of the bolt hole of cylinder body section 5.Sealing ring 6 is embedded with foregoing mutually corresponding seal groove 8, this is close
Sealing ring that seal 6 is infolding, that section is L-shaped, the gear of sealing ring 6 are enclosed in the axial abutment surface of adjacent cylinders section 5.
The axial length of each stay-bolt 4 is more than the summation of the axial length of each cylinder body section 5 of inner casing body.It is each
Root stay-bolt 4 is axially worn out of corresponding bolt hole of the cylinder body section 5 of the corresponding bolt hole of exhaust region-i.e. at steam discharge guide ring 13
Enter, and extend step by step in the corresponding bolt hole of each cylinder body section 5, until extending to the air chamber 3 of the corresponding bolt hole of steam admission side-i.e.
Corresponding bolt hole locking；Cylinder body section 5 end face of the outer end of each stay-bolt 4 at steam discharge guide ring 13 is connected with sphere
The length that stretches out of gasket assembly 10 and locking nut 11, stay-bolt 4 and its component is substantially outer with steam discharge guide ring 13
End flushes.In order to strengthen the coupling mechanism force of stay-bolt 4, improve stress, the outer end of each stay-bolt 4 is provided with axially blind
Cavernous structure, centre bore 9 that heat supply is tight.Foregoing each stay-bolt 4 is realizing axial locking to each cylinder body section 5 and air chamber 3
While, positioning action is also acted as, to ensure the radially and circumferentially position of each cylinder body section 5 and air chamber 3, ensures inner casing body
Each section of concentricity.
In this way, these stay-bolts 4 of inner casing body are sealed into whole with air chamber 3 by each cylinder body section 5 in the axial direction respectively
Body, form complete cylinder type, inner casing without split.
Certainly, above-mentioned each cylinder body section 5 and air chamber 3 with corresponding stationary vane assembly 7, should be right in axially combination connection
The assembling of rotor assembly 1 is answered synchronously to carry out, in order to facilitate rotor assembly 1 in the intrinsic assembling of inner casing, it is desirable to each cylinder body section 5
Minimum diameter R2 should be slightly larger than the maximum outside diameter R1 of matched rotor assembly 1, and this diameter difference should not influence inner casing body with turning
The assembling of sub-component 1.
In order to ensure interior cylinder structure is circumferentially symmetrical, the bolt hole in above-mentioned each cylinder body section 5 and air chamber 3 is preferably in circumference
On be uniformly distributed.
Embodiment 2
The present invention includes inner casing body, and the inner casing body has multiple cylinder type cylinder body sections and some stay-bolts.
Wherein, the cylinder body section of inner casing body is to correspond to according to the relative position of stationary vane assemblies at different levels and divide segmentation, i.e.,
Inner casing body is divided into multiple cylinder body sections according to stationary vane assemblies at different levels, and the cylinder body section corresponding to first stage stator blades component is with air chamber
Integrative-structure, each cylinder body section correspondingly install one-level stationary vane assembly.Open up and be disposed with the wall thickness circumference of foregoing each cylinder body section
Several bolts hole, the wherein bolt hole corresponding to first stage stator blades component in cylinder body section are studding structure, in other cylinder body sections
Bolt hole be through-hole structure, the bolt hole on each cylinder body section circumference corresponds in the axial direction.
Because above-mentioned each cylinder body section corresponds to stationary vane assemblies at different levels, it is necessary to stator blade group corresponding to being installed in each cylinder body section
Part；Again due to the cylinder type that above-mentioned each cylinder body section is ring-type, in order to facilitate the installation of stationary vane assembly, per one-level stationary vane assembly
It is divided into upper and lower two halves, there is horizontal flange between the stationary vane assembly of upper and lower two halves.Thus, the inwall of above-mentioned each cylinder body section
Provided with corresponding one-level stationary vane assembly halfbody, radial protrusion spacing double wedge and adjustment double wedge；Spacing double wedge is distributed in horizontal position
Arranged on left and right sides, i.e., the spacing double wedge corresponding to stationary vane assembly upper half/lower half be two, it is upper and lower that they are distributed in stationary vane assembly
Near half horizontal flange（Certainly, should be close to the side of corresponding halfbody）, so that spacing double wedge is corresponding with horizontal flange
The split end of the stationary vane assembly of combination；Adjustment double wedge is distributed in top side/bottom side of the above-below direction of a day status-i.e., i.e. stator blade
Adjustment double wedge corresponding to component upper half/lower half is one, and it is distributed in stationary vane assembly upper half/top of lower half-and is in cylinder
The top side or bottom side of body section inwall, so that top/bottom of the corresponding stationary vane assembly with horizontal flange combination of adjustment double wedge.Base
In this mounting structure of cylinder body section, the periphery of corresponding stationary vane assembly is provided with the embedding slot of corresponding cylinder body section upper raised teeth, specifically,
With a correspondence at the top of embedding slot of the periphery both ends end of stationary vane assembly upper half with two spacing double wedges of correspondence, periphery
Adjust the embedding slot of double wedge, the periphery both ends end of stationary vane assembly lower half has the embedding slot, outer of two spacing double wedges of correspondence
All bottoms have a corresponding embedding slot for adjusting double wedge；The internal diameter of embedding slot on stationary vane assembly should be slightly bigger than cylinder body loading end
Internal diameter, ensure that there is certain radial seal width between the stationary vane assembly that is assembled together and cylinder body section with this.With such
Assembling structure, stationary vane assemblies at different levels are assemblied in corresponding cylinder body section, and spacing double wedge corresponds to the halfbody of stationary vane assembly, a suspension,
Supporting role, adjustment double wedge correspond to the halfbody of stationary vane assembly, play a part of to adjust left and right position,
Above-mentioned each cylinder body section with corresponding stationary vane assembly is sequentially docked in the axial direction, makes each bolt hole in their circumferences in axle
Correspond upwards, steam discharge guide ring is connected with final stage cylinder body section.In order to ensure they are in the sealing axially docked, it is in
Mutually corresponding seal groove, tool are offered in the interface circumference of adjacent cylinders section in the high-pressure area of formed inner casing body
Body, first order cylinder body section is with circumferentially offering mutual corresponding seal groove on the interface of second level cylinder body section（Pair of the two
When junction is bonded, mutually corresponding seal groove forms a complete closure gasket groove）, second level cylinder body section and third level cylinder body section
Interface on circumferentially offer mutually corresponding to seal groove, by that analogy；In order to further improve sealing effectiveness, adjacent cylinder
Mutual corresponding seal groove on the interface of body section is twice, and this two seals groove is arranged on the inside of the bolt hole of cylinder body section and outer
Side, i.e., for mutually corresponding seal groove on the inside of the bolt hole of cylinder body section, another road mutually corresponds to spiral shell of the seal groove in cylinder body section together
On the outside of keyhole.It is foregoing mutually corresponding to be embedded with sealing ring in seal groove, the sealing ring be infolding, that section is L-shaped is close
Seal, sealing ring gear are enclosed in the axial abutment surface of adjacent cylinders section.
The axial length of each stay-bolt is more than the summation of the axial length of each cylinder body section of inner casing body.Each
Stay-bolt axially penetrates out of corresponding bolt hole of the cylinder body section of the corresponding bolt hole of exhaust region-i.e. at steam discharge guide ring, and
Extend step by step in the corresponding bolt hole of each cylinder body section, until extending to the first order cylinder body section of the corresponding bolt hole of steam admission side-i.e.
Corresponding bolt hole locking；Cylinder body section end face of the outer end of each stay-bolt at steam discharge guide ring is connected with spheric washer
Outer end of the length substantially with steam discharge guide ring that stretch out of component and locking nut, stay-bolt and its component flushes.In order to
Strengthen the coupling mechanism force of stay-bolt, improve stress, the outer end of each stay-bolt is provided with axial blind hole shape structure, confession
The tight centre bore of heat.Foregoing each stay-bolt also acts as positioning action while axial locking is realized to each cylinder body section, to
Ensure the radially and circumferentially position of each cylinder body section, ensure the concentricity of each section of inner casing body.
In this way, these stay-bolts of inner casing body are sealed integral by each cylinder body section in the axial direction respectively, formed complete
Inner casing cylinder type, without split.
Certainly, above-mentioned each cylinder body section with corresponding stationary vane assembly, should respective rotor component in axially combination connection
Assembling synchronously carry out, in order to facilitate rotor assembly in the intrinsic assembling of inner casing, it is desirable to which the minimum diameter of each cylinder body section should
Slightly larger than the maximum outside diameter of matched rotor assembly, this diameter difference should not influence the assembling of inner casing body and rotor assembly.
In order to ensure interior cylinder structure is circumferentially symmetrical, the bolt hole in above-mentioned each cylinder body section preferably uniformly divides in the circumferential
Cloth.
Embodiment 3
The present invention includes inner casing body, and the inner casing body has multiple cylinder type cylinder body sections and some stay-bolts.
Wherein, the cylinder body section of inner casing body is relative position according to one to two-stage stationary vane assembly and corresponding divides segmentation
, specifically, the cylinder body section corresponding to first stage stator blades component is structure as a whole with air chamber, the second level and third level stator blade group
The corresponding cylinder body section of part, the fourth stage and the corresponding cylinder body section of level V stationary vane assembly, by that analogy, so make first order cylinder
Other cylinder body sections at different levels outside body section correspond to two-stage stationary vane assembly respectively, the level of stationary vane assembly corresponding to the cylinder body section of certain final stage
The series of several total stationary vane assemblies of evidence determines at random.Opened up on the wall thickness circumference of foregoing each cylinder body section and be disposed with several bolts
Hole, the wherein bolt hole corresponding to first stage stator blades component in cylinder body section are studding structure, and the bolt hole in other cylinder body sections is
Through-hole structure, the bolt hole on each cylinder body section circumference correspond in the axial direction.
Because above-mentioned each cylinder body section corresponds to stationary vane assemblies at different levels, it is necessary to stator blade group corresponding to being installed in each cylinder body section
Part；Again due to the cylinder type that above-mentioned each cylinder body section is ring-type, in order to facilitate the installation of stationary vane assembly, per one-level stationary vane assembly
It is divided into upper and lower two halves, there is horizontal flange between the stationary vane assembly of upper and lower two halves.Thus, the inwall of above-mentioned each cylinder body section
According to the installation site of corresponding stationary vane assembly, and respective stages stationary vane assembly halfbody, radial protrusion limit can be installed by being provided with
Position double wedge and adjustment double wedge；Spacing double wedge is distributed in the arranged on left and right sides of horizontal position, i.e., corresponding to stationary vane assembly upper half/lower half
Spacing double wedge is two, and they are distributed near upper and lower half horizontal flange of stationary vane assembly（Certainly, should be close to corresponding halfbody
Side）, so that the split end of the corresponding stationary vane assembly with horizontal flange combination of spacing double wedge；Adjust double wedge distribution
Top side/bottom side of above-below direction in day status-i.e., i.e. adjustment double wedge corresponding to stationary vane assembly upper half/lower half are one, it point
Cloth is in stationary vane assembly upper half, and/top of lower half-is in the top side or bottom side of cylinder body section inwall so that adjustment double wedge it is corresponding with
Top/bottom of the stationary vane assembly of horizontal flange combination.This mounting structure based on cylinder body section, the periphery of corresponding stationary vane assembly
Embedding slot provided with corresponding cylinder body section upper raised teeth, specifically, the periphery both ends end of stationary vane assembly upper half has two correspondences
The embedding slot of spacing double wedge, periphery top have a corresponding embedding slot for adjusting double wedge, the periphery both ends of stationary vane assembly lower half
The embedding slot of embedding slot of the end with two spacing double wedges of correspondence, periphery bottom with a corresponding adjustment double wedge；Stator blade
The internal diameter of embedding slot on component should be slightly bigger than the internal diameter of cylinder body loading end, ensure the stationary vane assembly and cylinder that are assembled together with this
There is certain radial seal width between body section.With such assembling structure, stationary vane assemblies at different levels are assemblied in corresponding cylinder body section
Interior, spacing double wedge corresponds to the halfbody of stationary vane assembly, plays suspension, supporting role, and the halfbody that adjustment double wedge corresponds to stationary vane assembly plays tune
The effect of whole left and right position.
Above-mentioned each cylinder body section with corresponding stationary vane assembly is sequentially docked in the axial direction, makes each bolt hole in their circumferences
Correspond in the axial direction, steam discharge guide ring is connected with final stage cylinder body section.In order to ensure they are in the sealing axially docked,
Mutually corresponding seal is offered in the interface circumference for the adjacent cylinders section being in the high-pressure area of formed inner casing body
Groove, specifically, first order cylinder body section is with circumferentially offering mutual corresponding seal groove on the interface of second level cylinder body section（The two
Interface fitting when, mutually corresponding to seal groove form a complete closure gasket groove）, second level cylinder body section and third level cylinder
Mutually corresponding seal groove is circumferentially offered on the interface of body section, by that analogy；In order to further improve sealing effectiveness, phase
Mutual corresponding seal groove on the interface of adjacent cylinder body section is twice, and this two seals groove is arranged on the inside of the bolt hole of cylinder body section
And outside, i.e., for mutually corresponding seal groove on the inside of the bolt hole of cylinder body section, another road mutually corresponds to seal groove in cylinder body section together
Bolt hole on the outside of.It is foregoing mutually corresponding to be embedded with sealing ring in seal groove, the sealing ring be infolding, section it is L-shaped
Sealing ring, sealing ring gear be enclosed in the axial abutment surface of adjacent cylinders section.
The axial length of each stay-bolt is more than the summation of the axial length of each cylinder body section of inner casing body.Each
Stay-bolt axially penetrates out of corresponding bolt hole of the cylinder body section of the corresponding bolt hole of exhaust region-i.e. at steam discharge guide ring, and
Extend step by step in the corresponding bolt hole of each cylinder body section, until extending to the first order cylinder body section of the corresponding bolt hole of steam admission side-i.e.
Corresponding bolt hole locking；Cylinder body section end face of the outer end of each stay-bolt at steam discharge guide ring is connected with spheric washer
Outer end of the length substantially with steam discharge guide ring that stretch out of component and locking nut, stay-bolt and its component flushes.In order to
Strengthen the coupling mechanism force of stay-bolt, improve stress, the outer end of each stay-bolt is provided with axial blind hole shape structure, confession
The tight centre bore of heat.Foregoing each stay-bolt also acts as positioning action while axial locking is realized to each cylinder body section, to
Ensure the radially and circumferentially position of each cylinder body section, ensure the concentricity of each section of inner casing body.
In this way, these stay-bolts of inner casing body are sealed integral by each cylinder body section in the axial direction respectively, formed complete
Inner casing cylinder type, without split.
Certainly, above-mentioned each cylinder body section with corresponding stationary vane assembly, should respective rotor component in axially combination connection
Assembling synchronously carry out, in order to facilitate rotor assembly in the intrinsic assembling of inner casing, it is desirable to which the minimum diameter of each cylinder body section should
Slightly larger than the maximum outside diameter of matched rotor assembly, this diameter difference should not influence the assembling of inner casing body and rotor assembly.
In order to ensure interior cylinder structure is circumferentially symmetrical, the bolt hole in above-mentioned each cylinder body section preferably uniformly divides in the circumferential
Cloth.
Embodiment 4
The present invention includes inner casing body, and the inner casing body has multiple cylinder type cylinder body sections and some stay-bolts.
Wherein, the cylinder body section of inner casing body is to correspond to according to the relative position of stationary vane assemblies at different levels and divide segmentation, i.e.,
Inner casing body is divided into multiple cylinder body sections according to stationary vane assemblies at different levels, and the cylinder body section corresponding to first stage stator blades component is with air chamber
Integrative-structure, each cylinder body section correspondingly install one-level stationary vane assembly.Open up and be disposed with the wall thickness circumference of foregoing each cylinder body section
Several bolts hole, the wherein bolt hole corresponding to first stage stator blades component in cylinder body section are studding structure, in other cylinder body sections
Bolt hole be through-hole structure, the bolt hole on each cylinder body section circumference corresponds in the axial direction.
Because above-mentioned each cylinder body section corresponds to stationary vane assemblies at different levels, it is necessary to stator blade group corresponding to being installed in each cylinder body section
Part；Again due to the cylinder type that above-mentioned each cylinder body section is ring-type, in order to facilitate the installation of stationary vane assembly, per one-level stationary vane assembly
It is divided into upper and lower two halves, there is horizontal flange between the stationary vane assembly of upper and lower two halves.Thus, the inwall of above-mentioned each cylinder body section
Provided with corresponding one-level stationary vane assembly halfbody, radial protrusion spacing double wedge and adjustment double wedge；Spacing double wedge is distributed in horizontal position
Arranged on left and right sides, i.e., the spacing double wedge corresponding to stationary vane assembly upper half/lower half be two, it is upper and lower that they are distributed in stationary vane assembly
Near half horizontal flange（Certainly, should be close to the side of corresponding halfbody）, so that spacing double wedge is corresponding with horizontal flange
The split end of the stationary vane assembly of combination；Adjustment double wedge is distributed in top side/bottom side of the above-below direction of a day status-i.e., i.e. stator blade
Adjustment double wedge corresponding to component upper half/lower half is one, and it is distributed in stationary vane assembly upper half/top of lower half-and is in cylinder
The top side or bottom side of body section inwall, so that top/bottom of the corresponding stationary vane assembly with horizontal flange combination of adjustment double wedge.Base
In this mounting structure of cylinder body section, the periphery of corresponding stationary vane assembly is provided with the embedding slot of corresponding cylinder body section upper raised teeth, specifically,
With a correspondence at the top of embedding slot of the periphery both ends end of stationary vane assembly upper half with two spacing double wedges of correspondence, periphery
Adjust the embedding slot of double wedge, the periphery both ends end of stationary vane assembly lower half has the embedding slot, outer of two spacing double wedges of correspondence
All bottoms have a corresponding embedding slot for adjusting double wedge；The internal diameter of embedding slot on stationary vane assembly should be slightly bigger than cylinder body Duan Shangcheng
The internal diameter of section, ensure that there is certain radial seal width between the stationary vane assembly that is assembled together and cylinder body section with this.With
Such assembling structure, stationary vane assemblies at different levels are assemblied in corresponding cylinder body section, and spacing double wedge corresponds to the halfbody of stationary vane assembly, are risen outstanding
To hang, supporting role, adjustment double wedge corresponds to the halfbody of stationary vane assembly, plays a part of to adjust left and right position,
Above-mentioned each cylinder body section with corresponding stationary vane assembly is sequentially docked in the axial direction, makes each bolt hole in their circumferences in axle
Correspond upwards, steam discharge guide ring is connected with final stage cylinder body section.In order to ensure they are in the sealing axially docked, each phase
Mutually corresponding seal groove is offered in the interface circumference of adjacent cylinder body section, specifically, first order cylinder body section and second level cylinder body
Mutually corresponding seal groove is circumferentially offered on the interface of section（During the interface fitting of the two, mutually corresponding seal groove group
Into a complete closure gasket groove）, second level cylinder body section is mutual corresponding with circumferentially being offered on the interface of third level cylinder body section
Seal groove, by that analogy；In order to further improve sealing effectiveness, the mutual corresponding sealing on the interface of adjacent cylinders section
Groove is twice, and this two seals groove is arranged in the bolt hole inner side and outer side of cylinder body section, i.e., mutually corresponds to seal groove together in cylinder
On the inside of the bolt hole of body section, another road mutually corresponds to seal groove on the outside of the bolt hole of cylinder body section.Foregoing mutually corresponding close
Sealing ring, sealing ring that the sealing ring is infolding, that section is L-shaped are embedded with sealing groove, sealing ring gear is enclosed in adjacent cylinders section
Axial abutment surface on.
The axial length of each stay-bolt is more than the summation of the axial length of each cylinder body section of inner casing body.Each
Stay-bolt axially penetrates out of corresponding bolt hole of the cylinder body section of the corresponding bolt hole of exhaust region-i.e. at steam discharge guide ring, and
Extend step by step in the corresponding bolt hole of each cylinder body section, until extending to the first order cylinder body section of the corresponding bolt hole of steam admission side-i.e.
Corresponding bolt hole locking；Cylinder body section end face of the outer end of each stay-bolt at steam discharge guide ring is connected with spheric washer
Outer end of the length substantially with steam discharge guide ring that stretch out of component and locking nut, stay-bolt and its component flushes.In order to
Strengthen the coupling mechanism force of stay-bolt, improve stress, the outer end of each stay-bolt is provided with axial blind hole shape structure, confession
The tight centre bore of heat.Foregoing each stay-bolt also acts as positioning action while axial locking is realized to each cylinder body section, to
Ensure the radially and circumferentially position of each cylinder body section, ensure the concentricity of each section of inner casing body.
In this way, these stay-bolts of inner casing body are sealed integral by each cylinder body section in the axial direction respectively, formed complete
Inner casing cylinder type, without split.
Certainly, above-mentioned each cylinder body section with corresponding stationary vane assembly, should respective rotor component in axially combination connection
Assembling synchronously carry out, in order to facilitate rotor assembly in the intrinsic assembling of inner casing, it is desirable to which the minimum diameter of each cylinder body section should
Slightly larger than the maximum outside diameter of matched rotor assembly, this diameter difference should not influence the assembling of inner casing body and rotor assembly.
In order to ensure interior cylinder structure is circumferentially symmetrical, the bolt hole in above-mentioned each cylinder body section preferably uniformly divides in the circumferential
Cloth.
Embodiment 5
Other contents of the present embodiment are identical with the content of embodiment 1,2,3 or 4, and difference is：Between adjacent cylinders section
Seal groove be in side-medial/lateral of bolt hole.
Various embodiments above is only to illustrate the present invention, rather than its limitations；Although with reference to the various embodiments described above to this hair
It is bright to be described in detail, it will be understood by those within the art that：The present invention still can be to the various embodiments described above
In concrete technical scheme modify, or to which part technical characteristic carry out equivalent substitution, and these modification or replace
Change, the essence of appropriate technical solution is departed from the spirit and scope of the present invention.
Claims (9)
1. cylinder structure in a kind of turbine, including inner casing body, it is characterised in that：The inner casing body has more than two cylinders
Type cylinder body section（5）With some stay-bolts（4）, each cylinder body section（5）Wall thickness circumference on open up and be disposed with several bolts
Hole, and each cylinder body section（5）Bolt hole on circumference corresponds in the axial direction, these cylinder body sections of the inner casing body（5）
The docking of axle upstream sequence, each bolt hole in circumference is set to correspond in the axial direction, each stay-bolt（4）Install and be locked at these
Cylinder body section（5）Axial direction corresponding in bolt hole, these stay-bolts of the inner casing body（4）Respectively in the axial direction by each cylinder
Body section（5）Sealed integral, the complete cylinder type inner casing of formation.
2. cylinder structure in turbine according to claim 1, it is characterised in that：The cylinder body section of the inner casing body（5）At least press
According to stationary vane assemblies at different levels（7）Corresponding division segmentation；Or the cylinder body section of the inner casing body（5）At least according to stator blade groups at different levels
Part（7）And air chamber（3）Corresponding division segmentation；The stay-bolt of the inner casing body（4）Out of, corresponding bolt hole of the exhaust region
Axially penetrate and extend to steam admission side locking.
3. cylinder structure in turbine according to claim 1 or claim 2, it is characterised in that：The adjacent cylinders section of the inner casing body（5）
Interface circumference on offer mutually corresponding to seal groove（8）, in mutual corresponding seal groove（8）It is interior to be embedded with sealing ring
（6）, the sealing ring（6）Gear is enclosed in adjacent cylinders section（5）Axial abutment surface on.
4. cylinder structure in turbine according to claim 3, it is characterised in that：The adjacent cylinders section（5）Interface on
Mutually corresponding seal groove（8）For twice, this two seals groove（8）It is arranged in cylinder body section（5）Bolt hole inner side and outer side.
5. cylinder structure in turbine according to claim 3, it is characterised in that：The sealing ring（6）Sealed for the L-type of infolding
Circle.
6. cylinder structure in turbine according to claim 1 or claim 2, it is characterised in that：The cylinder body section（5）Inwall be provided with radially
Raised spacing double wedge（2）With adjustment double wedge（14）, the spacing double wedge（2）It is distributed in the left and right sides of horizontal position, correspondingly with water
The stationary vane assembly of flat split combination（7）Split end, the adjustment double wedge（14）Be distributed in day status top bottom both sides,
The corresponding stationary vane assembly combined with horizontal flange（7）Top/bottom part, the stationary vane assembly（7）Periphery be provided with corresponding cylinder body section
（5）The embedding slot of upper raised teeth, the stationary vane assembly（7）On the contour structure of embedding slot be more than cylinder body section（5）On correspondence it is convex
The contour structure of tooth.
7. cylinder structure in turbine according to claim 1 or claim 2, it is characterised in that：The stay-bolt（4）Outer end be connected with
Spheric washer component（10）And locking nut（11）.
8. cylinder structure in turbine according to claim 1 or claim 2, it is characterised in that：The stay-bolt（4）Outer end be provided with axle
To blind hole shape structure, centre bore that heat supply is tight（9）.
9. cylinder structure in turbine according to claim 1, it is characterised in that：Each cylinder body section of the inner casing body（5）Most
Small internal diameter（R2）More than matched rotor assembly（1）Maximum outside diameter（R1）.
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| CN201710929709.3A CN107780983B (en) | 2017-10-09 | 2017-10-09 | Turbine inner cylinder structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710929709.3A CN107780983B (en) | 2017-10-09 | 2017-10-09 | Turbine inner cylinder structure |
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| EP1158142A2 (en) * | 2000-05-20 | 2001-11-28 | General Electric Company | Reducing cracking adjacent shell flange connecting bolts |
| JP2005061273A (en) * | 2003-08-08 | 2005-03-10 | Ishikawajima Harima Heavy Ind Co Ltd | Gas turbine casing |
| JP2013050044A (en) * | 2011-08-30 | 2013-03-14 | Toshiba Corp | Seal structure and steam turbine |
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