CN106930789A - Steam turbine low-pressure exhaust casing water conservancy diversion ring structure - Google Patents
Steam turbine low-pressure exhaust casing water conservancy diversion ring structure Download PDFInfo
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- CN106930789A CN106930789A CN201710352717.6A CN201710352717A CN106930789A CN 106930789 A CN106930789 A CN 106930789A CN 201710352717 A CN201710352717 A CN 201710352717A CN 106930789 A CN106930789 A CN 106930789A
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- segmental arc
- section
- water conservancy
- conservancy diversion
- diversion ring
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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
- F01D25/30—Exhaust heads, chambers, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a kind of steam turbine low-pressure exhaust casing water conservancy diversion ring structure, water conservancy diversion ring body including bell mouth shape, steam discharge forms the sequence of motion of vortex when the water conservancy diversion ring body is by acting, it is divided into top segmental arc and bottom segmental arc in the circumferential, less than the circumferential cross-section of bottom segmental arc, the circumference of the water conservancy diversion ring body is variable section structure to the circumferential cross-section of the top segmental arc of the water conservancy diversion ring body.Present invention ensure that the bottom segmental arc back side of water conservancy diversion ring body can realize good, orderly effective control to moving descending vortex, i.e. top segmental arc is designed according to the generation of tip vortices structure, bottom segmental arc is designed according to vortex structure at descending horizontal plane is moved, the main flow diffusion space that low pressure exhaust hood is improved with this and the Performance of whole low pressure exhaust hood, pitot loss is effectively and reliably reduced, it is reliable, economic, practical.
Description
Technical field
The present invention relates to turbine low pressure cylinder, the specifically building block of turbine low pressure cylinder is one more specifically
Plant steam turbine low-pressure exhaust casing water conservancy diversion ring structure.
Background technology
The steam discharge volume flow of turbine low pressure cylinder is very big, and this causes that the size of low pressure (LP) cylinder is also very big, be in steam turbine most
Huge equipment.Due to flowing through the steam pressure in low pressure (LP) cylinder and temperature all than relatively low, the structural strength of low pressure (LP) cylinder cylinder body is not
It is the main technical problem of low pressure (LP) cylinder shaping, the main technical problem of low pressure (LP) cylinder shaping is to ensure that it is firm enough that it has
, it is necessary to the exhaust passage in low pressure (LP) cylinder should have reasonable, good flow behavior while spending, to reduce steam discharge loss.It is based on
This, the steam discharge of low pressure (LP) cylinder reduces steam discharge damage to make full use of the kinetic energy of steam discharge leaving velocity using the exhaust casing of radial direction diffusion structure
Lose, and guide ring is then one of important composition part of exhaust casing.
In the internal flow of low pressure exhaust hood, the separation of flow of water conservancy diversion ring surface and the interaction of vortex are exhaust casing internal pressures
The main cause of power loss.The aeroperformance of exhaust casing is subject to outer shell size, cylinder interior part geometry and relative position etc. many
The influence of weight factor, the profile molded line of wherein guide ring is an important influence factor.Due to the shaping of guide ring
Other structures in profile molded line and exhaust casing have collectively constituted the diffusion passage of steam discharge, thus guide ring profile molded line
Design level, necessarily directly affect the overall aeroperformance of exhaust casing.
The existing guide ring for being applied to steam turbine low-pressure exhaust casing is the circumferential uiform section structure of bell mouth shape, i.e., it is by same
The molded line section of one structure is formed by stacking by the circumferential track and order of design.This structure guide ring is being applied to steam turbine low-pressure
During exhaust casing, because the circumferential overall size of its steam discharge end margin is matched, consistent so that the main flow gas of upset to the guide ring back side
Just vortex has been formed about in guide ring exhaust steam end dorsal edge, has caused the movement locus of vortex to relatively close to guide ring exhaust steam end
The edge at the back side, easily makes the back side of guide ring lose control ability to vortex.Referring specifically to shown in Fig. 1, the steaming in acting
Vapour is expelled to exhaust steam end along the front molded line of water conservancy diversion ring body 1, from upset at the exhaust steam end top of water conservancy diversion ring body 1 to the back of the body
Face, vortex 4 is formed in switching process at the back side of water conservancy diversion ring body 1, and the vortex 4 fails by reliable, effective guiding to water conservancy diversion
The back side center of ring body 1, and the edge for being proximate to the exhaust steam end back side of guide ring body 1 moves downward down along both sides
OK；During descending, as the overall size of water conservancy diversion ring body 1 progressively becomes big, water conservancy diversion ring body 1 pair is in the exhaust steam end back side
The vortex 4 of edge is difficult to limit, and when running into including obstruction part including horizontal flange strut 3, vortex 4 easily can be from
Flipped out in the limitation at the back side of water conservancy diversion ring body 1, the steam flow to the near wall of outer shell 2 produces extruding, and then is formed larger
Extraneoas loss.As can be seen here, in the application of steam turbine low-pressure exhaust casing, it cannot be right for the guide ring of existing uiform section structure
The main flow gas overturn to the back side forms reliable, effective guiding so that results from its back side vortex and is in all the time near end
Edge motion is descending, the easy ability out of hand of this vortex that also may result in during guide ring is moved to the back side, and then produces
Larger extra pitot loss.
If the upset guide structure of main flow gas can be upwardly formed the exhaust steam end week of guide ring, carry on the back upset to guide ring
Center of the main flow gas in face at the guide ring back side forms vortex, then can strengthen the control ability that guide ring is vortexed to the back side,
Effectively and reliably reduce pitot loss, it is ensured that the space of main flow diffusion, the Performance to improve whole exhaust casing.However, cutting
Such achievement in research is only yet there are no in current industry to make public；Although Chinese patent literature discloses one in guide ring
Exhaust steam end edge opens up the technology of breach, entitled " turbine discharge diffusion flow-guiding structure and steam turbine "（Publication number：CN
104533548, publication date：On April 22nd, 2015）, but guide ring exhaust steam end gap structure disclosed by the technology is only to be used for
The convenient handling of lp outer casing upper half, do not consider the steam discharge aeroperformance of guide ring profile molded line, are even arranged with sacrificial section
Vapour aeroperformance realizes the convenient handling of lp outer casing upper half, that is to say, that guide ring exhaust steam end in the technology lacks
Mouth is not used to effective, reliable guiding of the main flow gas in upset to the guide ring back side.
The content of the invention
Technical purpose of the invention is：Particularity and existing water conservancy diversion ring structure for above-mentioned steam turbine low-pressure exhaust casing
Deficiency, there is provided it is a kind of under arms when can effectively and reliably reduce the steam turbine low-pressure exhaust casing guide ring knot of pitot loss
Structure.
The present invention realizes that the technical scheme that its technical purpose is used is：A kind of steam turbine low-pressure exhaust casing guide ring knot
Structure, including bell mouth shape water conservancy diversion ring body, steam discharge forms the sequence of motion of vortex when the water conservancy diversion ring body is by acting,
It is divided into top segmental arc and bottom segmental arc in circumference, the circumferential cross-section of the top segmental arc of the water conservancy diversion ring body is less than bottom segmental arc
Circumferential cross-section, the circumference of the water conservancy diversion ring body is variable section structure.
Preferably, the top segmental arc circumferential cross-section profile molded line shaping rule of the water conservancy diversion ring body is same as bottom
Portion's segmental arc circumferential cross-section profile molded line shaping rule, the development length that the circumferential cross-section profile molded line of the top segmental arc is outside is small
In the development length that the circumferential cross-section profile molded line of bottom segmental arc is outside.
Preferably, also there is sidepiece segmental arc, institute between the top segmental arc and bottom segmental arc of the water conservancy diversion ring body
The circumferential cross-section of sidepiece segmental arc is stated for variable section structure, each section of circumference of the sidepiece segmental arc is by top segmental arc to bottom segmental arc
It is in incremental variations, one end circumferential cross-section of the sidepiece segmental arc and the corresponding end of top segmental arc by the circumferential order of water conservancy diversion ring body
Portion's circumferential cross-section coincides, the corresponding end circumferential cross-section of other end circumferential cross-section and bottom segmental arc coincides.Further, institute
State the outer rim of sidepiece segmental arc by water conservancy diversion ring body the change of circumferential cross-section inclination angle rule sequentially, the outer rim of segmental arc and bottom at top
Linearly change between the outer rim of segmental arc.
Or, top segmental arc and bottom the segmental arc direct transition in the circumference of water conservancy diversion ring body of the water conservancy diversion ring body,
The circumferential cross-section of the top segmental arc and bottom segmental arc intersection is misaligned, the outer rim of the top segmental arc and bottom segmental arc it is outer
Edge sequentially forms step difference in the circumferential cross-section inclination angle rule change of water conservancy diversion ring body.
Preferably, the center of circle angle of the top segmental arc is 45 °~120 °.Further, the top segmental arc
Center of circle angle be 90 °~120 °.
Preferably, the circumferential cross-section of the top segmental arc is uiform section structure.
Preferably, the circumferential cross-section of the bottom segmental arc is uiform section structure.
Preferably, the turbine low pressure cylinder is downward steam exhaust structure.
The method have the benefit that：
1. flow behavior of the main flow gas on guide ring when the present invention is according to acting, water conservancy diversion ring body top segmental arc and
Circumferential cross-section is carried out bottom segmental arc the shaping of differentiation, top segmental arc circumferential cross-section is less than bottom segmental arc circumferential cross-section, from
And water conservancy diversion ring body exhaust steam end is molded with variable section structure in edge can effectively, reliably guide what main flow gas overturn
Guiding breach, the vortex for flowing through guiding breach and overturning to the water conservancy diversion ring body back side and formation is inner as far as possible, more remote
From steam discharge end margin, it is ensured that the bottom segmental arc back side of water conservancy diversion ring body can to move descending vortex realize it is good, orderly
Effectively control, i.e. top segmental arc are designed according to the generation of tip vortices structure, bottom segmental arc is according to the descending horizontal plane of motion
Place's vortex structure and design, the main flow diffusion space that low pressure exhaust hood is improved with this and the Performance of whole low pressure exhaust hood,
Pitot loss is effectively and reliably reduced, it is reliable, economic, practical；
2. the molding structure of present invention circumference variable cross-section is to be molded rule in the circumferential cross-section profile molded line for not changing water conservancy diversion ring body
On the premise of rule, segmental arc outside development length in top is controlled to reduce, so that segmental arc outside development length in bottom is more than
Top segmental arc, that is to say, that top, the circumferential cross-section of bottom segmental arc molded line Extending Law it is substantially coincident, simply top arc
Less than bottom segmental arc, it can reduce design, the technical difficulty for manufacturing to the length that stretches out of section, again can under arms when it is true
Its aeroperformance is protected, its reliability, economy, practicality is further enhancing；
3. the present invention has been molded the sidepiece of the orderly gradual change of circumferential cross-section between the top segmental arc and bottom segmental arc of water conservancy diversion ring body
Segmental arc, so that form good stream shape gradual transition between top segmental arc and bottom segmental arc, as high is as possible ensured with this
The stability and reliability of main flow gas upset guiding, it is to avoid the mutation structure between top segmental arc and bottom segmental arc is in upset
Main flow gas flow behavior interference, destruction, can make the vortex produced by upset to the water conservancy diversion ring body back side it is more orderly,
Stabilization, so ensure water conservancy diversion ring body the bottom segmental arc back side can to move descending vortex realize it is good, orderly effective
Control, the significantly more efficient distribution for controlling flowing in low pressure exhaust hood, the main flow diffusion for further improving low pressure exhaust hood is empty
Between and whole low pressure exhaust hood Performance, further effectively and reliably reduce pitot loss.
Brief description of the drawings
Fig. 1 illustrates for the existing uiform section steam discharge guide ring of turbine low pressure cylinder with the correlation of its back side vortex
Figure.
Fig. 2 is a kind of structural representation of the invention.
Fig. 3 is the characteristic angle schematic diagram of steam discharge guide ring shown in Fig. 1.
Fig. 4 is the frontal outline molded line schematic diagram of Section A-A in Fig. 2.
Fig. 5 is the frontal outline molded line schematic diagram of section B-B in Fig. 2.
Fig. 6 steam discharge guide rings shown in Fig. 2 and Fig. 3 of turbine low pressure cylinder are illustrated with the correlation of its back side vortex
Figure.
Fig. 7 is another structural representation of the invention.
Code name implication in figure：1-water conservancy diversion ring body；11-top segmental arc；1101-straightway molded line；1102、1103、
1104th, 1105-circular arc line segment type line；12-sidepiece segmental arc；13-bottom segmental arc；1301-straightway molded line；1302、1303、
1304th, 1305-circular arc line segment type line；2-outer shell；3-horizontal flange strut；4-vortex.
Specific embodiment
The present invention relates to the building block of steam turbine low-pressure exhaust casing, a kind of specifically steam turbine low-pressure exhaust casing is led
Technology contents of the invention are described in detail by stream ring structure with multiple embodiments below.Wherein, embodiment 1 is with reference to accompanying drawing 2
To 6 carry out in detail, specific description, embodiment 2 with reference to accompanying drawing 7 carry out in detail, specific description, though other embodiments are not independent
Draw but its agent structure can refer to the accompanying drawing of embodiment 1.
Embodiment 1
Referring to shown in Fig. 2 to Fig. 5, water conservancy diversion ring body 1 of the present invention including bell mouth shape structure, the water conservancy diversion ring body 1 is applied to
The steam turbine low-pressure exhaust casing of downward steam exhaust structure.
Water conservancy diversion ring body 1 is formed the sequence of motion of vortex by steam discharge when being done work during military service, is divided into the circumferential
Top segmental arc 11 and bottom segmental arc 13, have sidepiece segmental arc 12, i.e. sidepiece segmental arc 12 between top segmental arc 11 and bottom segmental arc 13
It is two sections, office at the butt and butt of top segmental arc 11 and bottom segmental arc 13.Wherein, the center of circle angle of top segmental arc 11 is about
90 °, the center of circle angle of bottom segmental arc 13 is about 180 °, and the center of circle angle of every section of sidepiece segmental arc 12 is about 45 °.
Water conservancy diversion ring body 1 is sequentially formed by stacking by the circumferential track of design by some circumferential cross-sections,
That is, the top segmental arc 11 of water conservancy diversion ring body 1, sidepiece segmental arc 12 and bottom segmental arc 13 have circumferential cross-section respectively.
The shaping rule of the profile molded line of the circumferential cross-section of top segmental arc 11, sidepiece segmental arc 12 and bottom segmental arc 13 is identical
, their circumferential cross-section is molded by identical circumferential cross-section inclination angle rule change order, i.e., be all according to specific
Propagation law axially and radially carries out extension extension, and simply the outside extension of the circumferential cross-section profile molded line of top segmental arc 11 is long
The degree development length outside less than the circumferential cross-section profile molded line of bottom segmental arc 13, each section of circumference of sidepiece segmental arc 12 is by top
Segmental arc 11 to bottom segmental arc 13 presses the circumferential order of water conservancy diversion ring body 1 in incremental variations, top segmental arc 11 and bottom segmental arc 13
Shown in frontal outline molded line as Fig. 3 and Fig. 4, their 1 section of straightway molded line respectively by sequentially linking up smoothly（1101/1301）With
4 sections of circular arc line segment type lines（1102、1103、1104、1105/1302、1303、1304、1305）Composition；That is, top arc
The profile molded line construction of the circumferential cross-section of section 11 and bottom segmental arc 13 is identical, and top segmental arc 11 each section phase of circumference
With-it is uiform section structure, each section of circumference of bottom segmental arc 13 is identical-and also it is uiform section structure, have the week of sidepiece segmental arc 12 only
To each section in order differentiation-be variable section structure.In this way, the circumferential cross-section of the top segmental arc 11 of water conservancy diversion ring body 2 is less than
The circumferential cross-section of bottom segmental arc 13, one end circumferential cross-section of each sidepiece segmental arc 12 is circumferentially cut with the corresponding end of top segmental arc 11
Face coincides, the corresponding end circumferential cross-section of other end circumferential cross-section and bottom segmental arc 13 coincides, each sidepiece segmental arc 12
Outer rim presses the circumferential cross-section inclination angle rule change of water conservancy diversion ring body 2 sequentially, the outer rim of segmental arc 11 and bottom segmental arc 13 at top
Linearly change between outer rim, the circumference of whole water conservancy diversion ring body 2 is variable section structure, the steam discharge end margin of water conservancy diversion ring body 2
Nick shaped-guiding breach is formed on place top, the molded line of the top segmental arc of water conservancy diversion ring body 1 is set according to tip vortices structure
Meter, under arms when to be controlled to tip vortices, the molded line of bottom segmental arc is designed according to horizontal plane vortex structure,
To be controlled to horizontal cross-section vortex during military service.
It is shown in Figure 6, it is of the invention when the steam turbine low-pressure exhaust casing of downward steam exhaust structure is applied to, in its acting
Main flow steam is expelled to exhaust steam end along the front molded line of water conservancy diversion ring body 1, the guiding from the top of the exhaust steam end of water conservancy diversion ring body 1
Indentation, there is overturn to the back side, and vortex 4 is formed at the back side of water conservancy diversion ring body 1 in switching process, and the vortex 4 is by reliable, effective
Guide to the back side center of water conservancy diversion ring body 1, moved downward along both sides in the back side center of water conservancy diversion ring body 1 descending；
During descending, as the overall size of water conservancy diversion ring body 1 progressively becomes big, the back side energy of the bottom segmental arc of water conservancy diversion ring body 1
It is enough to form good limitation to moving descending vortex 4.
Embodiment 2
Shown in Figure 7, water conservancy diversion ring body 1 of the present invention including bell mouth shape structure, the water conservancy diversion ring body 1 is applied to row downwards
The steam turbine low-pressure exhaust casing of vapour structure.
Water conservancy diversion ring body 1 is formed the sequence of motion of vortex by steam discharge when being done work during military service, is divided into the circumferential
Top segmental arc 11 and bottom segmental arc 13.Wherein, the center of circle angle of top segmental arc 11 is about 120 °, the center of circle angle of bottom segmental arc 13
About 240 °, i.e. top segmental arc 11 and 360 ° of complete annulus of the circumferential composition of bottom segmental arc 13.
Water conservancy diversion ring body 1 is sequentially formed by stacking by the circumferential track of design by some circumferential cross-sections,
That is, the top segmental arc 11 and bottom segmental arc 13 of water conservancy diversion ring body 1 have circumferential cross-section respectively.
The shaping rule of the profile molded line of the circumferential cross-section of top segmental arc 11 and bottom segmental arc 13 is identical, their week
All it is to be molded by identical circumferential cross-section inclination angle rule change order to section, i.e., is all according to specifically axially and radially
Propagation law carries out extension extension, and simply the outside development length of the circumferential cross-section profile molded line of top segmental arc 11 is less than bottom arc
The frontal outline molded line difference of the outside development length of circumferential cross-section profile molded line of section 13, top segmental arc 11 and bottom segmental arc 13
It is made up of the 1 section of straightway molded line and 4 sections of circular arc line segment type lines that sequentially link up smoothly；That is, top segmental arc 11 and bottom
The profile molded line construction of the circumferential cross-section of segmental arc 13 is identical, and each section of circumference of top segmental arc 11 it is identical-be uiform section
Structure, each section of circumference of bottom segmental arc 13 is identical-and also it is uiform section structure.In this way, the top segmental arc 11 of water conservancy diversion ring body 2
, less than the circumferential cross-section of bottom segmental arc 13, top segmental arc 11 and bottom segmental arc 13 are in the circumference of water conservancy diversion ring body 2 for circumferential cross-section
The circumferential cross-section of direct transition, top segmental arc 11 and the intersection of bottom segmental arc 13 is misaligned, the outer rim of top segmental arc 11 and bottom
The outer rim of segmental arc 13 sequentially forms step difference, whole guide ring sheet in the circumferential cross-section inclination angle rule change of water conservancy diversion ring body 2
The circumference of body 2 is variable section structure, and the exhaust steam end edge top of water conservancy diversion ring body 2 forms nick shaped-guiding breach, makes water conservancy diversion
The molded line of the top segmental arc of ring body 1 is designed according to tip vortices structure, under arms when to be controlled to tip vortices
System, the molded line of bottom segmental arc is designed according to horizontal plane vortex structure, under arms when to be controlled to horizontal cross-section vortex
System.
Embodiment 3
Water conservancy diversion ring body of the present invention including bell mouth shape structure, the water conservancy diversion ring body is applied to the steam turbine of downward steam exhaust structure
Low pressure exhaust hood.
Water conservancy diversion ring body is formed the sequence of motion of vortex by steam discharge when being done work during military service, and top is divided into the circumferential
Portion's segmental arc and bottom segmental arc.Wherein, the center of circle angle of top segmental arc is about 100 °, and the center of circle angle of bottom segmental arc is about 260 °,
That is top segmental arc and bottom segmental arc circumferentially constitutes 360 ° of complete annulus.
Water conservancy diversion ring body is sequentially formed by stacking by the circumferential track of design by some circumferential cross-sections, also
It is to say, the top segmental arc and bottom segmental arc of water conservancy diversion ring body have circumferential cross-section respectively.
The shaping rule of the profile molded line of the circumferential cross-section of top segmental arc and bottom segmental arc is identical, and their circumference is cut
Face is molded by identical circumferential cross-section inclination angle rule change order, i.e., be all according to extension specifically axially and radially
Rule carries out extension extension, simply the circumferential cross-section profile molded line of top segmental arc outside week of the development length less than bottom segmental arc
To the development length that cross section profile molded line is outside, the frontal outline molded line of top segmental arc and bottom segmental arc is respectively by the smooth rank of order
The 1 section of straightway molded line and 4 sections of circular arc line segment type line compositions for connecing；That is, the circumferential cross-section of top segmental arc and bottom segmental arc
Profile molded line construction be identical, and each section of circumference of top segmental arc it is identical-be uiform section structure, the circumference of bottom segmental arc
Each section is identical-and also it is uiform section structure.In this way, week of the circumferential cross-section of the top segmental arc of water conservancy diversion ring body less than bottom segmental arc
To section, the direct transition in the circumference of water conservancy diversion ring body of top segmental arc and bottom segmental arc, top segmental arc and bottom segmental arc are had a common boundary
The circumferential cross-section at place is misaligned, and the outer rim of top segmental arc and the outer rim of bottom segmental arc are advised at the circumferential cross-section inclination angle of water conservancy diversion ring body
Rule change sequentially forms step difference, and the circumference of whole water conservancy diversion ring body is variable section structure, the steam discharge end edge of water conservancy diversion ring body
Nick shaped-guiding breach is formed on top at edge, and make the molded line of the top segmental arc of water conservancy diversion ring body is carried out according to tip vortices structure
Design, under arms when to be controlled to tip vortices, the molded line of bottom segmental arc is designed according to horizontal plane vortex structure,
To be controlled to horizontal cross-section vortex when under arms.
Embodiment 4
Water conservancy diversion ring body of the present invention including bell mouth shape structure, the water conservancy diversion ring body is applied to the steam turbine of downward steam exhaust structure
Low pressure exhaust hood.
Water conservancy diversion ring body is formed the sequence of motion of vortex by steam discharge when being done work during military service, and top is divided into the circumferential
Portion's segmental arc and bottom segmental arc, there is sidepiece segmental arc, i.e. sidepiece segmental arc to be pushed up for two sections, office between top segmental arc and bottom segmental arc
At the butt and butt of portion's segmental arc and bottom segmental arc.Wherein, the center of circle angle of top segmental arc is about 60 °, the center of circle folder of bottom segmental arc
Angle is about 180 °, and the center of circle angle of every section of sidepiece segmental arc is about 60 °.
Water conservancy diversion ring body is sequentially formed by stacking by the circumferential track of design by some circumferential cross-sections, also
It is to say, the top segmental arc of water conservancy diversion ring body, sidepiece segmental arc and bottom segmental arc have circumferential cross-section respectively.
The shaping rule of the profile molded line of the circumferential cross-section of top segmental arc, sidepiece segmental arc and bottom segmental arc is identical, it
Circumferential cross-section be all to be molded by identical circumferential cross-section inclination angle rule change order, i.e., be all according to specific axial direction and
The propagation law of radial direction carries out extension extension, and simply the outside development length of the circumferential cross-section profile molded line of top segmental arc is less than bottom
The outside development length of the circumferential cross-section profile molded line of portion's segmental arc, each section of circumference of sidepiece segmental arc is by top segmental arc to bottom arc
Section press the circumferential order of water conservancy diversion ring body in incremental variations, and the frontal outline molded line of top segmental arc and bottom segmental arc is respectively by sequentially
The 1 section of straightway molded line and 4 sections of circular arc line segment type line compositions for linking up smoothly；That is, the week of top segmental arc and bottom segmental arc
Identical to the profile molded line construction in section, and each section of circumference of top segmental arc it is identical-be uiform section structure, bottom segmental arc
Each section of circumference it is identical-be also uiform section structure, have each section of circumference of sidepiece segmental arc differentiation-be variable cross-section in order only
Structure.In this way, circumferential cross-section of the circumferential cross-section of the top segmental arc of water conservancy diversion ring body less than bottom segmental arc, each sidepiece segmental arc
One end circumferential cross-section coincides with the corresponding end circumferential cross-section of top segmental arc, other end circumferential cross-section and bottom segmental arc it is corresponding
End circumferential cross-section coincides, and the outer rim of each sidepiece segmental arc presses the circumferential cross-section inclination angle rule change of water conservancy diversion ring body sequentially,
Linearly change between the outer rim of top segmental arc and the outer rim of bottom segmental arc, the circumference of whole water conservancy diversion ring body is variable cross-section knot
Nick shaped-guiding breach is formed on structure, the exhaust steam end edge top of water conservancy diversion ring body, makes the type of the top segmental arc of water conservancy diversion ring body
Line is designed according to tip vortices structure, under arms when to be controlled to tip vortices, the molded line of bottom segmental arc according to
Horizontal plane vortex structure is designed, under arms when to be controlled to horizontal cross-section vortex.
Embodiment 5
Water conservancy diversion ring body of the present invention including bell mouth shape structure, the water conservancy diversion ring body is applied to the steam turbine of downward steam exhaust structure
Low pressure exhaust hood.
Water conservancy diversion ring body is formed the sequence of motion of vortex by steam discharge when being done work during military service, and top is divided into the circumferential
Portion's segmental arc and bottom segmental arc, there is sidepiece segmental arc, i.e. sidepiece segmental arc to be pushed up for two sections, office between top segmental arc and bottom segmental arc
At the butt and butt of portion's segmental arc and bottom segmental arc.Wherein, the center of circle angle of top segmental arc is about 45 °, the center of circle folder of bottom segmental arc
Angle is about 195 °, and the center of circle angle of every section of sidepiece segmental arc is about 60 °.
Water conservancy diversion ring body is sequentially formed by stacking by the circumferential track of design by some circumferential cross-sections, also
It is to say, the top segmental arc of water conservancy diversion ring body, sidepiece segmental arc and bottom segmental arc have circumferential cross-section respectively.
The shaping rule of the profile molded line of the circumferential cross-section of top segmental arc, sidepiece segmental arc and bottom segmental arc is identical, it
Circumferential cross-section be all to be molded by identical circumferential cross-section inclination angle rule change order, i.e., be all according to specific axial direction and
The propagation law of radial direction carries out extension extension, and simply the outside development length of the circumferential cross-section profile molded line of top segmental arc is less than bottom
The outside development length of the circumferential cross-section profile molded line of portion's segmental arc, each section of circumference of sidepiece segmental arc is by top segmental arc to bottom arc
Section press the circumferential order of water conservancy diversion ring body in incremental variations, and the frontal outline molded line of top segmental arc and bottom segmental arc is respectively by sequentially
The 1 section of straightway molded line and 4 sections of circular arc line segment type line compositions for linking up smoothly；That is, the week of top segmental arc and bottom segmental arc
Identical to the profile molded line construction in section, and each section of circumference of top segmental arc it is identical-be uiform section structure, bottom segmental arc
Each section of circumference it is identical-be also uiform section structure, have each section of circumference of sidepiece segmental arc differentiation-be variable cross-section in order only
Structure.In this way, circumferential cross-section of the circumferential cross-section of the top segmental arc of water conservancy diversion ring body less than bottom segmental arc, each sidepiece segmental arc
One end circumferential cross-section coincides with the corresponding end circumferential cross-section of top segmental arc, other end circumferential cross-section and bottom segmental arc it is corresponding
End circumferential cross-section coincides, and the outer rim of each sidepiece segmental arc presses the circumferential cross-section inclination angle rule change of water conservancy diversion ring body sequentially,
Linearly change between the outer rim of top segmental arc and the outer rim of bottom segmental arc, the circumference of whole water conservancy diversion ring body is variable cross-section knot
Nick shaped-guiding breach is formed on structure, the exhaust steam end edge top of water conservancy diversion ring body, makes the type of the top segmental arc of water conservancy diversion ring body
Line is designed according to tip vortices structure, under arms when to be controlled to tip vortices, the molded line of bottom segmental arc according to
Horizontal plane vortex structure is designed, under arms when to be controlled to horizontal cross-section vortex.
Various embodiments above is only used 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 equivalent is carried out to which part technical characteristic, and these modifications or replace
Change, the essence of appropriate technical solution is departed from the spirit and scope of the present invention.
Claims (10)
1. a kind of water conservancy diversion ring body of steam turbine low-pressure exhaust casing water conservancy diversion ring structure, including bell mouth shape（1）, it is characterised in that：
The water conservancy diversion ring body（1）Steam discharge forms the sequence of motion of vortex during by acting, and top segmental arc is divided into the circumferential（11）With
Bottom segmental arc（13）, the water conservancy diversion ring body（2）Top segmental arc（11）Circumferential cross-section be less than bottom segmental arc（13）Circumference
Section, the water conservancy diversion ring body（2）Circumference be variable section structure.
2. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 1, it is characterised in that：The water conservancy diversion ring body
（2）Top segmental arc（11）Circumferential cross-section profile molded line shaping rule is same as bottom segmental arc（13）Circumferential cross-section profile molded line into
Type rule, the top segmental arc（11）The outside development length of circumferential cross-section profile molded line be less than bottom segmental arc（13）Circumference
The outside development length of cross section profile molded line.
3. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 1 or claim 2, it is characterised in that：The guide ring sheet
Body（2）Top segmental arc（11）With bottom segmental arc（13）Between also have sidepiece segmental arc（12）, the sidepiece segmental arc（12）Week
It is variable section structure, the sidepiece segmental arc to section（12）Each section of circumference by top segmental arc（11）To bottom segmental arc（13）Press
Water conservancy diversion ring body（1）Circumferential order be in incremental variations, the sidepiece segmental arc（12）One end circumferential cross-section and top segmental arc
（11）Corresponding end circumferential cross-section coincide, other end circumferential cross-section and bottom segmental arc（13）Corresponding end circumferential cross-section phase
Overlap.
4. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 3, it is characterised in that：The sidepiece segmental arc（12）
Outer rim press water conservancy diversion ring body（2）The change of circumferential cross-section inclination angle rule sequentially, in top segmental arc（11）Outer rim and bottom arc
Section（13）Outer rim between linearly change.
5. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 1 or claim 2, it is characterised in that：The guide ring sheet
Body（2）Top segmental arc（11）With bottom segmental arc（13）In water conservancy diversion ring body（2）Circumference on direct transition, the top segmental arc
（11）With bottom segmental arc（13）The circumferential cross-section of intersection is misaligned, the top segmental arc（11）Outer rim and bottom segmental arc（13）
Outer rim in water conservancy diversion ring body（2）The change of circumferential cross-section inclination angle rule sequentially form step difference.
6. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 1 or claim 2, it is characterised in that：The top segmental arc
（11）Center of circle angle be 45 °~120 °.
7. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 6, it is characterised in that：The top segmental arc（11）
Center of circle angle be 90 °~120 °.
8. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 1 or claim 2, it is characterised in that：The top segmental arc
（11）Circumferential cross-section be uiform section structure.
9. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 1 or claim 2, it is characterised in that：The bottom segmental arc
（13）Circumferential cross-section be uiform section structure.
10. steam turbine low-pressure exhaust casing water conservancy diversion ring structure according to claim 1, it is characterised in that：The steam turbine low-pressure
Exhaust casing is downward steam exhaust structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710352717.6A CN106930789A (en) | 2017-05-18 | 2017-05-18 | Steam turbine low-pressure exhaust casing water conservancy diversion ring structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710352717.6A CN106930789A (en) | 2017-05-18 | 2017-05-18 | Steam turbine low-pressure exhaust casing water conservancy diversion ring structure |
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| Publication Number | Publication Date |
|---|---|
| CN106930789A true CN106930789A (en) | 2017-07-07 |
Family
ID=59429687
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710352717.6A Pending CN106930789A (en) | 2017-05-18 | 2017-05-18 | Steam turbine low-pressure exhaust casing water conservancy diversion ring structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137282A (en) * | 2021-04-21 | 2021-07-20 | 杭州汽轮机股份有限公司 | Reaction type turbine stage group connecting structure and structural parameter design method thereof |
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| JP2005023809A (en) * | 2003-06-30 | 2005-01-27 | Toshiba Corp | Steam turbine |
| US20090308075A1 (en) * | 2005-03-31 | 2009-12-17 | Hitachi, Ltd. | Turbine exhaust system and method for modifying the same |
| US20100162705A1 (en) * | 2008-12-30 | 2010-07-01 | Sharrow Edward J | Methods, systems and/or apparatus relating to steam turbine exhaust diffusers |
| CN102434233A (en) * | 2011-12-09 | 2012-05-02 | 青岛捷能汽轮机集团股份有限公司 | Exhaust steam cylinder of miniature steam turbine |
| CN104533548A (en) * | 2014-11-11 | 2015-04-22 | 东方电气集团东方汽轮机有限公司 | Steam exhaust diffusion flow guiding structure of steam turbine and steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005023809A (en) * | 2003-06-30 | 2005-01-27 | Toshiba Corp | Steam turbine |
| US20090308075A1 (en) * | 2005-03-31 | 2009-12-17 | Hitachi, Ltd. | Turbine exhaust system and method for modifying the same |
| US20100162705A1 (en) * | 2008-12-30 | 2010-07-01 | Sharrow Edward J | Methods, systems and/or apparatus relating to steam turbine exhaust diffusers |
| CN102434233A (en) * | 2011-12-09 | 2012-05-02 | 青岛捷能汽轮机集团股份有限公司 | Exhaust steam cylinder of miniature steam turbine |
| CN104533548A (en) * | 2014-11-11 | 2015-04-22 | 东方电气集团东方汽轮机有限公司 | Steam exhaust diffusion flow guiding structure of steam turbine and steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113137282A (en) * | 2021-04-21 | 2021-07-20 | 杭州汽轮机股份有限公司 | Reaction type turbine stage group connecting structure and structural parameter design method thereof |
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