CN208310944U - Reaction turbine fixed guide vane empennage - Google Patents
Reaction turbine fixed guide vane empennage Download PDFInfo
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- CN208310944U CN208310944U CN201820592351.XU CN201820592351U CN208310944U CN 208310944 U CN208310944 U CN 208310944U CN 201820592351 U CN201820592351 U CN 201820592351U CN 208310944 U CN208310944 U CN 208310944U
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- empennage
- guide vane
- fixed guide
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- outlet edge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Hydraulic Turbines (AREA)
Abstract
The utility model discloses a kind of reaction turbine fixed guide vane empennages, belong to turbine technology field, including the empennage ontology being mounted in the middle part of fixed guide vane outlet edge, it is characterized by: the empennage ontology is in the form of a column, the cross section of empennage ontology is trapezoidal, by empennage bottom edge, empennage outlet edge, first empennage side and the second empennage side surround, empennage bottom edge length and fixed guide vane outlet edge equal length, empennage bottom edge is fixedly connected with fixed guide vane outlet edge, the empennage bottom edge is parallel with empennage outlet edge, and empennage bottom edge length is greater than empennage and is discharged edge lengths.Empennage is directly welded on fixed guide vane outlet edge by the utility model, it can be improved the excited frequency of Karman vortex street, reduce the hammer vibration energy of Karman vortex street, to achieve the purpose that fixed guide vane is exported to Karman vortex street frequency and fixed guide vane intrinsic frequency to be staggered and eliminate resonance, it avoids cracking, entire engineering construction difficulty is small, and the period is short, at low cost.
Description
Technical field
The utility model relates to arrive turbine technology field more particularly to a kind of reaction turbine fixed guide vane empennage.
Background technique
There are two functions for the fixed guide vane tool of reaction turbine, first, will come from spiral case as flow passage components
Uniform fluid flow import movable guide vane；Second, as stressed member, by the weight transmitting of entire turbine-generator units to coagulation
On earth foundation.Due to the progress of reaction turbine the Hydraulic Design technology, seldom gone out using the fixed guide vane that state-of-the-art technology designs
Existing hydroelastic resonance problem.But there are two reasons still to make this covibration even on some reaction turbines to have put into operation
There is generation, first is that the frequency that existing the Hydraulic Design technology is also difficult to export fixed guide vane Karman vortex street carries out Accurate Prediction；
Second is that the enlargement of reaction turbine and the reduction of fixed guide vane thickness are so that the rigidity of fixed guide vane reduces, to reduce
The intrinsic frequency of fixed guide vane, increase fixed guide vane outlet Karman vortex street frequency be overlapped with intrinsic frequency and generate resonate can
It can property.Once there is this resonance, will occur whistle in hydraulic turbine operation, and cause fixed guide vane to split in a short period of time
Line.
The formation of Karman vortex street is mainly that fixed guide vane Profile Design is bad, is produced in fixed guide vane front and back near exit
Raw flow separation, caused by the flow separation whirlpool of front and back is in being staggeredly detached from.The frequency of Karman vortex street isWherein fkFor
Karman vortex street frequency Hz；S is Si Teluha number, it is related with Reynolds number, in reaction turbine, S=0.18~0.24；V
Mainstream speed m/s outside for boundary layer；T is the tail width m of the separation of flow, which is fixed guide vane outlet edge thickness, just
The sum of face boundary layer thickness, back side boundary layer thickness three.
Once fixed guide vane outlet Karman vortex street frequency is equal or close with the underwater natural frequencies of fixed guide vane,
It just will appear hydroelastic resonance.Eliminate this resonance, theoretically only two kinds of frequencies need to be staggered, i.e., otherwise improve toll bar
Vortex street frequency or the intrinsic frequency for improving fixed guide vane.And from the feasibility for having put into operation reaction turbine engineering practice
It says, becomes very difficult by increasing fixed guide vane rigidity to improve its intrinsic frequency.Therefore, in the prior art, usually not
Using change fixed guide vane intrinsic frequency method, and mainly using improve fixed guide vane export Karman vortex street frequency method come
Eliminate this resonance.It has not only been staggered using the method for improving Karman vortex street frequency and has been overlapped with fixed guide vane intrinsic frequency, moreover it is possible to
The energy of Karman vortex street is substantially reduced, because Karman vortex street frequency is once improve, the energy of vortex street will weaken significantly, thus pole
The earth reduces a possibility that Karman vortex street evokes resonance.
In the prior art, in order to improve fixed guide vane outlet Karman vortex street frequency, most common method is to fixed guide vane
The back side carries out repairing type, by the molded line at the fixed guide vane back side near modification fixed guide vane outlet edge, and fixed guide vane water outlet is thinned
The thickness on side reduces the separation of flow of fixed guide vane outlet edge, reduces fixed guide vane outlet edge separation of flow point tail width, improves Karman vortex street
Frequency reduces vortex street energy, to achieve the purpose that eliminate resonance.However but had the following disadvantages using this repairing type method,
First, since Karman vortex street frequency and fixed guide vane intrinsic frequency are theoretically difficult accurately to provide, fixed guide vane tail portion
Repairing type amount is difficult to determine, that is to say, that carrying out repairing type to fixed guide vane outlet edge cannot ensure to accomplish in one move, and need in many cases
Resonance problem caused by Karman vortex street could thoroughly be eliminated by carrying out multiple repairing type, and engineering construction difficulty is big, and the period is long, cost
It is high；Second, fixed guide vane is the most important stressed member of reaction turbine, repairing type is carried out to fixed guide vane outlet edge and how much can
Reduce the mechanical strength of fixed guide vane；Third, carrying out how much repairing type can change the intrinsic of fixed guide vane to fixed guide vane outlet edge
Frequency, this is also that wrong frequency between Karman vortex street excited frequency and fixed guide vane intrinsic frequency brings new uncertainty.
Publication No. CN 201047332Y, publication date are that on 04 16th, 2008 Chinese patent literatures disclose one kind
Turbine stay ring is led including upper ring plate and lower ring plate, the circumferential fixation one by one being uniformly welded between upper ring plate and lower ring plate
Leaf, lower retainer plate and lower fixed ring with the upper retainer plate of upper ring plate welding and upper fixed ring and lower ring plate welding, feature
Be: fixed circle and upper fixed ring are welded on the lower end surface of upper ring plate, are welded with ring diversion plate in upper fixed ring outer circle,
Gusset is uniformly welded between ring diversion plate and upper ring plate；Lower retainer plate and lower fixed ring are welded on the upper surface of lower ring plate,
It is welded with ring diversion plate in lower fixed ring outer circle, gusset is uniformly welded between ring diversion plate and lower ring plate.
Turbine stay ring disclosed in the patent document, due to the unreasonable structural design of fixed guide vane, fixed guide vane outlet
Karman vortex street frequency is easy to be overlapped with fixed guide vane intrinsic frequency, generates hydroelastic resonance, fixed guide vane is caused to crack.
Utility model content
The utility model in order to overcome the defects of the prior art described above, provides a kind of reaction turbine fixed guide vane tail
Empennage is directly welded on fixed guide vane outlet edge by the wing, the utility model, can be improved the excited frequency of Karman vortex street, reduces
The hammer vibration energy of Karman vortex street disappears to reach and fixed guide vane outlet Karman vortex street frequency is staggered with fixed guide vane intrinsic frequency
It except the purpose of resonance, avoids cracking, entire engineering construction difficulty is small, and the period is short, at low cost.
The utility model is achieved through the following technical solutions:
Reaction turbine fixed guide vane empennage, it is special including the empennage ontology being mounted in the middle part of fixed guide vane outlet edge
Sign is: the empennage ontology is in the form of a column, and the cross section of empennage ontology is trapezoidal, by empennage bottom edge, empennage outlet edge, the first tail
Flank side and the second empennage side surround, empennage bottom edge length and fixed guide vane outlet edge equal length, empennage bottom edge with
Fixed guide vane outlet edge is fixedly connected, and the empennage bottom edge is parallel with empennage outlet edge, and empennage bottom edge length goes out greater than empennage
Waterside length.
The side on the empennage bottom edge is provided with the first welding groove in 45 degree, and the other side is provided with the second welding in 45 degree
Groove, the first welding groove and the second welding groove are arranged symmetrically, and empennage bottom edge and fixed guide vane outlet edge pass through welded connecting.
The empennage outlet edge with a thickness of 3-5 millimeters.
Spacing between the upper end of the empennage ontology and the upper end of fixed guide vane outlet edge is that fixed guide vane outlet edge is high
The 1-5% of degree, the spacing between the lower end of empennage ontology and the lower end of fixed guide vane outlet edge are fixed guide vane outlet edge height
1-5%.
The working principle of the utility model is as follows:
Fixed guide vane empennage is a kind of small panel of welding equipment on fixed guide vane outlet edge, be it is local, to reaction type
For the hydraulic characteristic(s) and mechanical performance of the hydraulic turbine without negative effect, fixed guide vane empennage uses certain cross section for trapezoidal shape
Shape can be improved the excited frequency of Karman vortex street, reduce the hammer vibration energy of Karman vortex street, block to reach and export fixed guide vane
Door vortex street frequency and fixed guide vane intrinsic frequency, which are staggered, eliminates the purpose of resonance.
The beneficial effects of the utility model are mainly manifested in following aspect:
One, the utility model, " empennage ontology is in the form of a column, and the cross section of empennage ontology is trapezoidal, by empennage bottom edge, empennage
Outlet edge, the first empennage side and the second empennage side surround, empennage bottom edge length and fixed guide vane outlet edge equal length, tail
Wing bottom edge is fixedly connected with fixed guide vane outlet edge, and empennage bottom edge is parallel with empennage outlet edge, and empennage bottom edge length is greater than tail
The wing is discharged edge lengths ", in use, directly empennage is welded on fixed guide vane outlet edge, and it can be improved Karman vortex street
Excited frequency, reduces the hammer vibration energy of Karman vortex street, and fixed guide vane is exported Karman vortex street frequency and fixed guide vane to reach
Intrinsic frequency, which is staggered, eliminates the purpose of resonance, avoids cracking, entire engineering construction difficulty is small, and the period is short, at low cost.
Two, the utility model, the side on empennage bottom edge are provided with the first welding groove in 45 degree, and the other side is provided in 45 degree
The second welding groove, the first welding groove and the second welding groove be arranged symmetrically, and empennage bottom edge and fixed guide vane outlet edge are logical
Welded connecting is crossed, influence of the site welding to fixed guide vane can not only be reduced, ensures integral strength, and scene can be reduced
The workload of welding equipment fixed guide vane empennage.
Three, the utility model, the spacing between the upper end of empennage ontology and the upper end of fixed guide vane outlet edge are that fixation is led
The 1-5% of leaf outlet edge height, the spacing between the lower end of empennage ontology and the lower end of fixed guide vane outlet edge are fixed guide vane
The 1-5% of outlet edge height, so that between the upper end of empennage ontology and the upper ring plate of reaction turbine and under empennage ontology
It holds and is each provided with one between the lower ring plate of reaction turbine and leaves a blank distance, be able to maintain seat ring and the fixation of reaction turbine
The intrinsic frequency of guide vane is constant, improves the accuracy of be staggered Karman vortex street frequency and fixed guide vane intrinsic frequency；Distance of leaving a blank is
The 1-5% of fixed guide vane outlet edge height can allow empennage ontology to cover fixation as much as possible along fixed guide vane short transverse
Guide vane is discharged border region.
Detailed description of the invention
The utility model is described in further detail with specific embodiment with reference to the accompanying drawings of the specification, in which:
Fig. 1 is that the utility model is mounted on the schematic diagram on reaction turbine fixed guide vane；
Fig. 2 is the schematic cross-section of the utility model；
Fig. 3 is the sectional view that the utility model is connect with fixed guide vane outlet edge；
Marked in the figure: 1, empennage ontology, 2, empennage bottom edge, 3, empennage outlet edge, the 4, first empennage side, the 5, second empennage
Side, the 6, first welding groove, the 7, second welding groove.
Specific embodiment
Embodiment 1
Referring to Fig. 1 and Fig. 2, reaction turbine fixed guide vane empennage, including being mounted in the middle part of fixed guide vane outlet edge
Empennage ontology 1, the empennage ontology 1 are in the form of a column, and the cross section of empennage ontology 1 is trapezoidal, by empennage bottom edge 2, empennage outlet edge
3, the first empennage side 4 and the second empennage side 5 surround, 2 length of empennage bottom edge and fixed guide vane outlet edge equal length,
Empennage bottom edge 2 is fixedly connected with fixed guide vane outlet edge, and the empennage bottom edge 2 is parallel with empennage outlet edge 3, and empennage bottom edge 2
Length is greater than 3 length of empennage outlet edge.
The present embodiment be most basic embodiment, " empennage ontology is in the form of a column, and the cross section of empennage ontology is trapezoidal, by
Empennage bottom edge, empennage outlet edge, the first empennage side and the second empennage side surround, and empennage bottom edge length and fixed guide vane are discharged
Edge lengths are equal, and empennage bottom edge is fixedly connected with fixed guide vane outlet edge, and empennage bottom edge is parallel with empennage outlet edge, and empennage bottom
Edge lengths are greater than empennage and are discharged edge lengths ", in use, directly empennage is welded on fixed guide vane outlet edge, and can mention
The excited frequency of high Karman vortex street, reduces the hammer vibration energy of Karman vortex street, to reach fixed guide vane outlet Karman vortex street frequency
Rate and fixed guide vane intrinsic frequency, which are staggered, eliminates the purpose of resonance, avoids cracking, entire engineering construction difficulty is small, the period
It is short, it is at low cost.
Embodiment 2
Referring to Fig. 1 and Fig. 3, reaction turbine fixed guide vane empennage, including being mounted in the middle part of fixed guide vane outlet edge
Empennage ontology 1, the empennage ontology 1 are in the form of a column, and the cross section of empennage ontology 1 is trapezoidal, by empennage bottom edge 2, empennage outlet edge
3, the first empennage side 4 and the second empennage side 5 surround, 2 length of empennage bottom edge and fixed guide vane outlet edge equal length,
Empennage bottom edge 2 is fixedly connected with fixed guide vane outlet edge, and the empennage bottom edge 2 is parallel with empennage outlet edge 3, and empennage bottom edge 2
Length is greater than 3 length of empennage outlet edge.
The side on the empennage bottom edge 2 is provided with the first welding groove 6 in 45 degree, and the other side is provided with the second weldering in 45 degree
Groove 7 is connect, the first welding groove 6 and the second welding groove 7 are arranged symmetrically, and empennage bottom edge 2 and fixed guide vane outlet edge pass through weldering
It connects in succession.
The present embodiment is a better embodiment, and the side on empennage bottom edge is provided with the first welding groove in 45 degree, another
Side is provided with the second welding groove in 45 degree, and the first welding groove and the second welding groove are arranged symmetrically, empennage bottom edge and fixation
Guide vane outlet edge can not only reduce influence of the site welding to fixed guide vane by welded connecting, ensure integral strength, and
The workload of live welding equipment fixed guide vane empennage can be reduced.
Embodiment 3
Referring to Fig. 1 and Fig. 3, reaction turbine fixed guide vane empennage, including being mounted in the middle part of fixed guide vane outlet edge
Empennage ontology 1, the empennage ontology 1 are in the form of a column, and the cross section of empennage ontology 1 is trapezoidal, by empennage bottom edge 2, empennage outlet edge
3, the first empennage side 4 and the second empennage side 5 surround, 2 length of empennage bottom edge and fixed guide vane outlet edge equal length,
Empennage bottom edge 2 is fixedly connected with fixed guide vane outlet edge, and the empennage bottom edge 2 is parallel with empennage outlet edge 3, and empennage bottom edge 2
Length is greater than 3 length of empennage outlet edge.
The side on the empennage bottom edge 2 is provided with the first welding groove 6 in 45 degree, and the other side is provided with the second weldering in 45 degree
Groove 7 is connect, the first welding groove 6 and the second welding groove 7 are arranged symmetrically, and empennage bottom edge 2 and fixed guide vane outlet edge pass through weldering
It connects in succession.
The empennage outlet edge 3 with a thickness of 3 millimeters.
Spacing between the upper end of the empennage ontology 1 and the upper end of fixed guide vane outlet edge is that fixed guide vane outlet edge is high
The 1% of degree, the spacing between the lower end of empennage ontology 1 and the lower end of fixed guide vane outlet edge are fixed guide vane outlet edge height
1%.
The present embodiment is another better embodiment.
Embodiment 4
Referring to Fig. 1 and Fig. 3, reaction turbine fixed guide vane empennage, including being mounted in the middle part of fixed guide vane outlet edge
Empennage ontology 1, the empennage ontology 1 are in the form of a column, and the cross section of empennage ontology 1 is trapezoidal, by empennage bottom edge 2, empennage outlet edge
3, the first empennage side 4 and the second empennage side 5 surround, 2 length of empennage bottom edge and fixed guide vane outlet edge equal length,
Empennage bottom edge 2 is fixedly connected with fixed guide vane outlet edge, and the empennage bottom edge 2 is parallel with empennage outlet edge 3, and empennage bottom edge 2
Length is greater than 3 length of empennage outlet edge.
The side on the empennage bottom edge 2 is provided with the first welding groove 6 in 45 degree, and the other side is provided with the second weldering in 45 degree
Groove 7 is connect, the first welding groove 6 and the second welding groove 7 are arranged symmetrically, and empennage bottom edge 2 and fixed guide vane outlet edge pass through weldering
It connects in succession.
The empennage outlet edge 3 with a thickness of 4 millimeters.
Spacing between the upper end of the empennage ontology 1 and the upper end of fixed guide vane outlet edge is that fixed guide vane outlet edge is high
The 3% of degree, the spacing between the lower end of empennage ontology 1 and the lower end of fixed guide vane outlet edge are fixed guide vane outlet edge height
3%.
The present embodiment is another better embodiment.
Embodiment 5
Referring to Fig. 1 and Fig. 3, reaction turbine fixed guide vane empennage, including being mounted in the middle part of fixed guide vane outlet edge
Empennage ontology 1, the empennage ontology 1 are in the form of a column, and the cross section of empennage ontology 1 is trapezoidal, by empennage bottom edge 2, empennage outlet edge
3, the first empennage side 4 and the second empennage side 5 surround, 2 length of empennage bottom edge and fixed guide vane outlet edge equal length,
Empennage bottom edge 2 is fixedly connected with fixed guide vane outlet edge, and the empennage bottom edge 2 is parallel with empennage outlet edge 3, and empennage bottom edge 2
Length is greater than 3 length of empennage outlet edge.
The side on the empennage bottom edge 2 is provided with the first welding groove 6 in 45 degree, and the other side is provided with the second weldering in 45 degree
Groove 7 is connect, the first welding groove 6 and the second welding groove 7 are arranged symmetrically, and empennage bottom edge 2 and fixed guide vane outlet edge pass through weldering
It connects in succession.
The empennage outlet edge 3 with a thickness of 5 millimeters.
Spacing between the upper end of the empennage ontology 1 and the upper end of fixed guide vane outlet edge is that fixed guide vane outlet edge is high
The 5% of degree, the spacing between the lower end of empennage ontology 1 and the lower end of fixed guide vane outlet edge are fixed guide vane outlet edge height
5%.
The present embodiment is preferred forms.
Claims (4)
1. reaction turbine fixed guide vane empennage, special including the empennage ontology (1) being mounted in the middle part of fixed guide vane outlet edge
Sign is: the empennage ontology (1) is in the form of a column, and the cross section of empennage ontology (1) is trapezoidal, is discharged by empennage bottom edge (2), empennage
Side (3), the first empennage side (4) and the second empennage side (5) surround, and empennage bottom edge (2) length and fixed guide vane are discharged
Edge lengths are equal, and empennage bottom edge (2) are fixedly connected with fixed guide vane outlet edge, the empennage bottom edge (2) and empennage outlet edge (3)
In parallel, and empennage bottom edge (2) length is greater than empennage outlet edge (3) length.
2. reaction turbine fixed guide vane empennage according to claim 1, it is characterised in that: the empennage bottom edge (2)
Side be provided with the first welding groove (6) in 45 degree, the other side is provided with the second welding groove (7) in 45 degree, the first welding
Groove (6) and the second welding groove (7) are arranged symmetrically, and empennage bottom edge (2) and fixed guide vane outlet edge pass through welded connecting.
3. reaction turbine fixed guide vane empennage according to claim 1, it is characterised in that: the empennage outlet edge
(3) with a thickness of 3-5 millimeters.
4. reaction turbine fixed guide vane empennage according to claim 1, it is characterised in that: the empennage ontology (1)
Upper end and fixed guide vane outlet edge upper end between spacing be fixed guide vane outlet edge height 1-5%, empennage ontology (1)
Lower end and fixed guide vane outlet edge lower end between spacing be fixed guide vane outlet edge height 1-5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820592351.XU CN208310944U (en) | 2018-04-24 | 2018-04-24 | Reaction turbine fixed guide vane empennage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820592351.XU CN208310944U (en) | 2018-04-24 | 2018-04-24 | Reaction turbine fixed guide vane empennage |
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| Publication Number | Publication Date |
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| CN208310944U true CN208310944U (en) | 2019-01-01 |
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ID=64714326
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| CN201820592351.XU Active CN208310944U (en) | 2018-04-24 | 2018-04-24 | Reaction turbine fixed guide vane empennage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019206004A1 (en) * | 2018-04-24 | 2019-10-31 | 东方电气集团东方电机有限公司 | Seat ring of reaction water turbine |
| WO2019206009A1 (en) * | 2018-04-24 | 2019-10-31 | 东方电气集团东方电机有限公司 | Method for preventing cracks caused by resonance of fixed guide vanes of reaction water turbine |
-
2018
- 2018-04-24 CN CN201820592351.XU patent/CN208310944U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019206004A1 (en) * | 2018-04-24 | 2019-10-31 | 东方电气集团东方电机有限公司 | Seat ring of reaction water turbine |
| WO2019206009A1 (en) * | 2018-04-24 | 2019-10-31 | 东方电气集团东方电机有限公司 | Method for preventing cracks caused by resonance of fixed guide vanes of reaction water turbine |
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