CN210686071U - Sealing flange of gas turbine cylinder - Google Patents
Sealing flange of gas turbine cylinder Download PDFInfo
- Publication number
- CN210686071U CN210686071U CN201921723805.3U CN201921723805U CN210686071U CN 210686071 U CN210686071 U CN 210686071U CN 201921723805 U CN201921723805 U CN 201921723805U CN 210686071 U CN210686071 U CN 210686071U
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- flange
- cylinder
- gas turbine
- sealing
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- 238000007789 sealing Methods 0.000 title claims abstract description 60
- 239000000463 material Substances 0.000 claims abstract description 39
- 238000003466 welding Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000005435 mesosphere Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010205 computational analysis Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
The utility model provides a sealing flange of a gas turbine cylinder, which comprises an upper flange connected with the upper half cylinder of the cylinder and a lower flange connected with the lower half cylinder of the cylinder, wherein the upper flange and the lower flange are both divided into an inner part and an outer part along the radial direction of the cylinder, the inner flange positioned in the inner part and the outer flange positioned in the outer part adopt different materials, and the thermal expansion coefficient of the material used by the inner flange is greater than that of the material used by the outer flange; the outer flange is provided with bolt holes for assembling bolts. The utility model discloses a flange and outer flange in the different materials preparation are greater than the outer flange inflation volume through the inner flange inflation volume and reduce gas turbine mid-split flange inboard and open a mouthful clearance to improve gas turbine mid-split flange sealing performance.
Description
Technical Field
The utility model relates to a gas turbine especially relates to a sealing flange of gas turbine cylinder.
Background
The gas turbine cylinder is used as a gas turbine gas pressure maintaining component and bears temperature load and gas pressure load in a working state. At present, a gas turbine cylinder is generally divided into an upper half cylinder and a lower half cylinder, a split flange and a bolt are adopted for connection, flange contact pressure generated by bolt pretightening force is utilized for flange sealing, and gas leakage is prevented from causing reduction of the operation efficiency of the gas turbine, increase of the operation cost and possible accidents of a power plant.
With the progress of cooling technology, material performance and manufacturing process, the gas turbine is designed towards high pressure ratio and high operation temperature, which leads to the leakage of the cylinder split flange, and thus, the sealing performance of the cylinder split flange is more critical.
The sealing performance of the split flange in the cylinder can be improved by increasing the pretightening force of the bolts, the diameter of the bolts and the number of the bolts, but the sealing effect is limited by considering the material performance, the structural space of the components and the cost of the components.
The Chinese invention patent CN102322299B discloses a cylinder middle section sealing structure and a sealing method, wherein a groove is arranged on a cylinder middle section of a steam turbine, then a sealing strip is added, and the sealing strip is used for blocking a steam leakage path, thereby achieving the sealing effect.
The Chinese invention patent CN105298559A discloses and describes a heavy duty gas turbine horizontal split cylinder flange sealing structure, the flange comprises an upper half cylinder horizontal flange and a lower half cylinder horizontal flange, the upper half cylinder horizontal flange and the lower half cylinder horizontal flange are connected together through a first bolt and a nut, it is characterized in that trapezoidal auxiliary mounting platforms are arranged at the inner sides and the outer sides of the upper half cylinder horizontal flange and the lower half cylinder horizontal flange, a through hole is arranged at the joint surface of the upper half cylinder horizontal flange and the lower half cylinder horizontal flange, the sealing structure further comprises an outer side clamping flange and an inner side clamping flange, the outer side clamping flange and the inner side clamping flange are provided with trapezoidal grooves matched with the trapezoidal auxiliary mounting platform, the outer side clamping flange is provided with a unthreaded hole, the inner side clamping flange is provided with a threaded hole, and a second bolt penetrates through the unthreaded hole and is screwed into the threaded hole to clamp the outer side clamping flange and the inner side clamping flange and enable the upper half cylinder horizontal flange and the lower half cylinder horizontal flange to be tightly attached.
The Chinese invention patent CN103670543B discloses a steam turbine cylinder adopting a novel split surface structure, wherein the split surface of the two half cylinder bodies which are contacted adopts a wedge-shaped or cambered surface wedge-shaped unparallel structure. By adopting the unparallel bisection surface with the initial state gap being wedge-shaped or arc wedge-shaped, the contact pressure distribution of the bisection surface of the cylinder is optimized, and the effects of improving sealing and reducing the load of the bolt or the red lantern ring are achieved.
It can be seen that the current method is to improve the sealing performance of the cylinder flange by additionally adding a sealing strip, a sealing flange or changing the structure of the mid-split flange. This increases the complexity of the structure and increases the cost of the components.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings of the prior art, an object of the present invention is to provide a sealing flange of a gas turbine cylinder, which is used for solving the problem of complicated sealing structure added to the sealing flange in the prior art.
In order to achieve the above and other related objects, the present invention provides a sealing flange for a gas turbine cylinder, including an upper flange connected to an upper half cylinder of the cylinder and a lower flange connected to a lower half cylinder of the cylinder, wherein the upper flange and the lower flange are both divided into an inner portion and an outer portion along a radial direction of the cylinder, the inner flange located inside and the outer flange located outside are made of different materials, and a coefficient of thermal expansion of the material used for the inner flange is greater than a coefficient of thermal expansion of the material used for the outer flange; the outer flange is provided with bolt holes for assembling bolts.
Preferably, the coefficient of thermal expansion of the material used for the inner flange is 5% to 10% greater than the coefficient of thermal expansion of the material used for the outer flange.
Preferably, the inner flange and the outer flange are fixed by welding.
Preferably, the upper half cylinder of the air cylinder is connected with the inner flange of the upper flange in a welding mode, and the lower half cylinder of the air cylinder is connected with the inner flange of the lower flange in a welding mode.
Preferably, the inner flange and the outer flange are integrally formed.
As the above, the utility model discloses a sealing flange of gas turbine cylinder has following beneficial effect: the inner flange and the outer flange are made of different materials, and the expansion amount of the inner flange is larger than that of the outer flange to reduce the opening gap at the inner side of the split flange in the gas turbine, so that the sealing performance of the split flange in the gas turbine is improved; compared with the existing mode of additionally adding a sealing strip or a sealing flange or changing a mid-split flange structure, the utility model 1) simplifies the component structure; 2) the function of strengthening the sealing effect of the flange is achieved on the premise of not changing the structural characteristic that the joint surface of the traditional flange is a horizontal plane and is easy to process.
Drawings
Fig. 1 shows a schematic view of a sealing flange of a gas turbine cylinder according to the present invention.
Fig. 2 shows a flow chart of a design method of the sealing flange of the gas turbine cylinder according to the present invention.
Description of the element reference numerals
1 upper half cylinder
2. 5 inner flange
3. 4 outer flange
6 lower half cylinder
7. 10 nut
8 bolt
9 gasket
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1-2. It should be understood that the structures, ratios, sizes, etc. shown in the drawings of the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any modification of the structures, changes of the ratio relationship, or adjustment of the sizes should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
As shown in fig. 1, the utility model provides a sealing flange of gas turbine cylinder, including the upper flange that links to each other with the first half 1 of cylinder and the lower flange that links to each other with the second half 6 of cylinder, upper flange and lower flange all divide into inside and outside two parts along the radial of cylinder, and the inner flange 2, 5 that are in inside and the outer flange 3, 4 that are in outside adopt different materials, and the upper flange includes inner flange 2 and outer flange 3, and the lower flange includes inner flange 5 and outer flange 4, and the coefficient of thermal expansion of the material that inner flange 2, 5 used is greater than the coefficient of thermal expansion of the material that outer flange 3, 4 used, and the inner flange is close to gas turbine main gas flow path; the outer flanges 3, 4 are provided with bolt holes for mounting bolts 8. The utility model discloses with the flange along radially being divided into inside and outside two parts, adopt different thermal expansion coefficient's material to process into interior flange and outer flange to this reduces gas turbine well minute face flange inboard gapped clearance, thereby improves gas turbine well minute face flange sealing performance, its simple structure easily realizes.
In order to achieve a good sealing of the sealing flanges, the coefficient of thermal expansion of the material used for the inner flanges 2, 5 is in this embodiment 5-10% greater than the coefficient of thermal expansion of the material used for the outer flanges 3, 4.
For convenience of processing, the combined surface of the upper flange and the lower flange is a horizontal surface. The bolt 8 is assembled in the bolt holes of the upper flange and the lower flange, a washer 9 is further arranged on the bolt 8, and nuts 7 and 10 are fixed at two ends of the bolt, so that the upper cylinder and the lower cylinder are connected and fixed.
In the embodiment, the inner flanges 2 and 5 are welded and fixed with the outer flanges 3 and 4, the upper half cylinder 1 of the air cylinder is welded and connected with the inner flange 2 of the upper flange, and the lower half cylinder 6 of the air cylinder is welded and connected with the inner flange 5 of the lower flange.
The inner flanges 2, 5 and the outer flanges 3, 4 can also be integrally formed by a manufacturing process to form an integral piece without a subsequent welding process.
The utility model also provides a production above-mentioned gas turbine cylinder's sealing flange's design method, as shown in FIG. 2, it includes following step:
1) preparing a cylinder flange model and various parameters: preparing a gas turbine cylinder flange geometric model, acquiring material parameters, calculating required temperature load and pressure load and bolt pre-tightening load parameters, and using the geometric model and the parameters as input parameters for calculation and analysis of subsequent finite element software;
2) finite element calculation analysis: determining a sealing weak area and a gap value of the flange and temperature and pressure data of a corresponding position from a calculation simulation angle through finite element software modeling and sealing analysis of the flange;
3) and (3) field operation data feedback correction: correcting the calculation analysis method and data in the step 2) by combining the operation data of the on-site gas turbine and the feedback of the cylinder opening overhaul result;
4) designing a sealing flange structure and selecting a sealing flange material: combining the calculation and analysis in the step 2) and the field data of the gas turbine in the step 3), carrying out structural design on the sealing flange, and dividing the flange into an inner part and an outer part along the radial direction of the cylinder, wherein the inner part is an inner flange and the outer part is an outer flange; selecting a proper inner flange material according to the temperature and pressure data, namely enhancing the thermal expansion coefficient of the material used as the inner flange, so that the thermal expansion coefficient of the material used for the inner flange is larger than that of the material used for the outer flange;
5) developing the structural integrity calculation and check work of the sealing flange, developing stress analysis, fatigue life analysis and sealing analysis, and ensuring that the sealing flange cannot generate strength problems and sealing problems in the operating period of the gas turbine: if so, going to step 4) to reselect the material for the inner flange, and if not, going to step 6);
6) carrying out engineering drawing and manufacturing and assembling work of the sealing flange;
7) and finishing the design of the sealing flange.
Preferably, in the step 4), when the thermal expansion coefficient of the material used for the inner flange is increased, the thermal expansion coefficient is gradually increased from 5.0% higher than that of the material used for the outer flange to 10.0% higher than that of the material used for the outer flange; step 5) is performed simultaneously during the stepwise enhancement.
As a specific example of the sealing flange:
the linear expansion coefficient of the material used by the outer flange is 1.2e-5/K, and when the linear expansion coefficient of the material used by the inner flange is 1.2e-5/K, the maximum opening gap between the upper flange and the lower flange is positioned on the inner wall surface of the inner flange in the operating working condition, and the gap is 0.34 mm.
And (3) combining the finite element software computational analysis in the step 2) and the field data feedback in the step 3), selecting the sealing inner flange material in the step 4), and carrying out computational analysis and assessment, namely the step 5). When the linear expansion coefficient of the material used for the inner flange is improved by 5.0% and is 1.26e-5/K, in the operating condition, the maximum opening gap between the upper flange and the lower flange is positioned at the inner wall surface of the inner flange, the gap is 0.29mm, the gap is reduced by 14.7% compared with the original gap, and the sealing property is enhanced; when the linear expansion coefficient of the material used for the inner flange is improved by 10.0% and is 1.32e-5/K, in the operating condition, the maximum opening gap between the upper flange and the lower flange is positioned at the inner wall surface of the inner flange, the gap is 0.23mm, the gap is reduced by 32.4% compared with the original gap, and the sealing property is enhanced. Meanwhile, the stress and fatigue life analysis of the alloy steel sheet is checked.
And then, carrying out engineering drawing and part processing and assembling work of the sealing flange to complete the design of the sealing flange.
To sum up, the utility model discloses a sealing flange of gas turbine cylinder adopts different materials preparation inner flange and outer flange, is greater than outer flange inflation volume through the inner flange inflation volume and reduces the inboard clearance of opening a mouthful of flange of gas turbine mesosphere to improve gas turbine mesosphere flange sealing performance. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. A sealing flange of a gas turbine cylinder comprises an upper flange connected with an upper half cylinder of the cylinder and a lower flange connected with a lower half cylinder of the cylinder, and is characterized in that the upper flange and the lower flange are both divided into an inner part and an outer part along the radial direction of the cylinder, the inner flange positioned in the inner part and the outer flange positioned in the outer part are made of different materials, and the thermal expansion coefficient of the material used for the inner flange is greater than that of the material used for the outer flange; the outer flange is provided with bolt holes for assembling bolts.
2. A gas turbine cylinder sealing flange according to claim 1, wherein: the coefficient of thermal expansion of the material used for the inner flange is 5% -10% greater than the coefficient of thermal expansion of the material used for the outer flange.
3. A gas turbine cylinder sealing flange according to claim 1, wherein: the inner flange and the outer flange are fixed in a welding mode.
4. A gas turbine cylinder sealing flange according to claim 1, wherein: the upper half cylinder of the air cylinder is connected with the inner flange of the upper flange in a welding mode, and the lower half cylinder of the air cylinder is connected with the inner flange of the lower flange in a welding mode.
5. A gas turbine cylinder sealing flange according to claim 1, wherein: the inner flange and the outer flange are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921723805.3U CN210686071U (en) | 2019-10-15 | 2019-10-15 | Sealing flange of gas turbine cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921723805.3U CN210686071U (en) | 2019-10-15 | 2019-10-15 | Sealing flange of gas turbine cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210686071U true CN210686071U (en) | 2020-06-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921723805.3U Withdrawn - After Issue CN210686071U (en) | 2019-10-15 | 2019-10-15 | Sealing flange of gas turbine cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210686071U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593969A (en) * | 2019-10-15 | 2019-12-20 | 上海电气集团股份有限公司 | Sealing flange of gas turbine cylinder and design method thereof |
-
2019
- 2019-10-15 CN CN201921723805.3U patent/CN210686071U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593969A (en) * | 2019-10-15 | 2019-12-20 | 上海电气集团股份有限公司 | Sealing flange of gas turbine cylinder and design method thereof |
| CN110593969B (en) * | 2019-10-15 | 2024-04-05 | 上海电气集团股份有限公司 | Sealing flange of gas turbine cylinder and design method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200605 Effective date of abandoning: 20240405 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200605 Effective date of abandoning: 20240405 |