CN202348355U - High height-width ratio horizontal joint flange for upper and lower half cylinder bodies of steam turbine - Google Patents
High height-width ratio horizontal joint flange for upper and lower half cylinder bodies of steam turbine Download PDFInfo
- Publication number
- CN202348355U CN202348355U CN2011205324386U CN201120532438U CN202348355U CN 202348355 U CN202348355 U CN 202348355U CN 2011205324386 U CN2011205324386 U CN 2011205324386U CN 201120532438 U CN201120532438 U CN 201120532438U CN 202348355 U CN202348355 U CN 202348355U
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- steam turbine
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Abstract
The utility model discloses a high height-width ratio horizontal joint flange for upper and lower half cylinder bodies of a steam turbine. The flange comprises an upper half cylinder and a lower half cylinder, which are symmetrically arranged. The lower end face of the upper half cylinder is matched with the upper end face of the lower half cylinder to form a horizontal joint. A flange bolt hole is formed in each of the upper and lower half cylinders, and the flange bolt holes are communicated with each other. A centerline of each flange bolt hole is positioned within a range from a point of intersection of the outer ring arc of a corresponding cylinder body and the horizontal joint to a point of intersection of a centerline of an outer cylinder wall and the horizontal joint. The ratio of the height h to the width l of the horizontal joint flange, namely a height-width ratio h/l is within the range of 1.45 to 1.65. The ratio s/l of the positioning size s of the flange bolt holes to the width l of the flange is within the range of 1 to 1.25. The operating requirements of the steam turbine can be met; and the flange has sufficient rigidity and strength, and is simple in structural process, high in steam tightness and convenient to mount, overhaul and the like.
Description
Technical field
The utility model relates to second cylinder body horizontal flange adpting flange on a kind of steam turbine, is specially adapted to turbine high-pressure part outer shell horizontal flange bolted flange structure.
Background technique
Steam turbine is made up of stator portion cover and rotor part cover for revolution type generating driving arrangement.For the ease of the assembling of rotor part cover and in place, mostly steam turbine stator portion cover is that horizontal flange is to opening structure.Second horizontal flange adopts flange bolt articulated structure on it.The steam turbine outer shell is bearing very high pressure and very big temperature gradient for the cylinder body of steam turbine internal energy conversion steam and structure and the extraneous housing of separating, particularly high-pressure section.
In the steam turbine starting process, horizontal flange is in unidirectional heated condition, has the bigger temperature difference between internal and external walls and flange and the cylinder wall.Except that producing thermal stress, the thermal distortion that the cylinder cross section also can occur causes flange to rise mouthful and leaks vapour.As shown in Figure 1, adopt flange arrangement to guarantee the steam tightness of cylinder during traditional design, adopt the flange heating equipment to reduce the horizontal flange thermal distortion simultaneously with bloated poor.The flange heating equipment adopts in the blue bolt hole of one vapour source introduction method; One by one through each bolt hole with heating flange, reduce flange thermal stress and thermal distortion, if but in the unit shutdown process cylinder wall and horizontal joint flange temperature in allowed band; Can obviously control under the satisfactory situation of difference that expands; Then the flange heating equipment need not put into operation, and causes this apparatus function waste, increases the unit cost.
Summary of the invention
The purpose of the utility model is for overcoming the deficiency of above-mentioned existing technology, second cylinder body horizontal flange large ratio of height to width flange on a kind of steam turbine is provided, and this strength of flange is high, simple in structure, the flange temperature gradient is little, good seal performance, highly versatile.
For realizing above-mentioned purpose, the utility model adopts following technical proposals:
Second cylinder body horizontal flange large ratio of height to width flange on a kind of steam turbine; Comprise up and down on the symmetrically arranged cylinder half-sum cylinder second; Match the formation horizontal flange first second upper-end surface of lower end surface and cylinder of cylinder; The half-sum cylinder is provided with the flange bolt hole that communicates in second on the cylinder, and the center line in said flange bolt hole is positioned at the intersection point and outer casing wall center line and horizontal flange intersection point scope of cylinder body outer shroud camber line and horizontal flange.
Second flange height h and the ratio of width l of said horizontal flange cylinder up and down first or cylinder, promptly depth-width ratio h/l is in 1.45～1.65 scopes.
The ratio of the location dimension s in said flange bolt hole and flange width l, promptly s/l is in 1～1.25 scope.Conventional wide flange structure s/l is in 0.5～0.6 scope.
The bolt center line of the utility model should the intersection point of cylinder body outer shroud camber line and horizontal flange with outside in casing wall center line and the horizontal flange intersection point scope; Make the major part of bolt be positioned at the cylinder wall part; When unit start and stop and variable load operation; Bolt and flange and outer casing wall conduct heat good, can not produce localized heat stress and thermal expansion and too concentrate the phenomenon that causes cylinder body and flange distortion.
The utility model adopts the large ratio of height to width flange to make that the difference of cylinder wall thickness and flange width is less; The major part of screw is positioned at the cylinder wall part; The metal quality that reduces the casing split place is concentrated, and flange inside and outside wall temperature distribution gradient is less, guarantees that the cylinder horizontal flange has steam tight performance preferably; Reduce operation simultaneously, be convenient to install maintenance.For the wide flange structure of using the flange heating equipment; Large ratio of height to width flange rigidity better and temperature variation can be synchronous with cylinder; Bolt is positioned near the cylinder wall side; Guarantee easily the casing split steam tightness, cancelled the flange heating equipment, the quick starting and the variable load operation of steam turbine set had adaptability preferably.
The utility model is applicable to the hp outer cylinder horizontal joint flange structure of large-scale subcritical ultrahigh pressure, High temperature and High pressure Steam Turbine.Through cylinder body and horizontal joint flange strength test and practical operation situation monitoring analysis; This novel horizontal flange large ratio of height to width flange arrangement satisfies the steam turbine operation usage requirement, has enough rigidity and intensity, and structural manufacturing process is simple; Steam tightness is good, is convenient to operations such as installation, maintenance.
Description of drawings
Fig. 1 is conventional wide flange structural representation;
Fig. 2 is the utility model structural representation;
Wherein 1, cylinder second, 2, cylinder first, 3, the center line of flange bolt, 4, cylinder body outer shroud camber line, 5. horizontal flange, 6. outer casing wall center line.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
As shown in Figure 2; Match and form horizontal flange 5 in first lower end surface of 2 of cylinder and second upper-end surface of 1 of cylinder; Cylinder first 2 with cylinder second is provided with the flange bolt hole that communicates in 1, the center line 3 in said flange bolt hole is positioned at the intersection point and outer casing wall center line 6 and horizontal flange 5 intersection point scopes of cylinder body outer shroud camber line 4 and horizontal flange 5.Make the major part of bolt be positioned at the cylinder wall part, when unit start and stop and variable load operation, bolt and flange and outer casing wall conduct heat good, can not produce localized heat stress and thermal expansion and too concentrate the phenomenon that causes cylinder body and flange distortion.
The ratio of horizontal integration split flange height h and width l, promptly depth-width ratio h/l is in 1.45～1.65 scopes.The ratio of flange tapped hole location dimension s and flange width l, promptly s/l is in 1～1.25 scope.Conventional wide flange structure s/l is in 0.5～0.6 scope.
On the large ratio of height to width flange second according to the scaling factor h/l of height and the width respectively with second adopts cast inblock on the outer shell cylinder body.Go up second cylinder blank and respectively the horizontal integration split is processed, reach seal request with roughness and the planeness that guarantees split.After treating that split processes, with second buckles well and adopt the taper pin location on the cylinder body, according to large ratio of height to width flange bolt location dimension s level of processing split flange bolt hole.
Though the above-mentioned accompanying drawing that combines is described the embodiment of the utility model; But be not restriction to the utility model protection domain; One of ordinary skill in the art should be understood that; On the basis of the technological scheme of the utility model, those skilled in the art need not pay various modifications that creative work can make or distortion still in the protection domain of the utility model.
Claims (3)
1. second cylinder body horizontal flange large ratio of height to width flange on the steam turbine; Comprise up and down on the symmetrically arranged cylinder half-sum cylinder second; Match the formation horizontal flange first second upper-end surface of lower end surface and cylinder of cylinder; The half-sum cylinder is provided with the flange bolt hole that communicates in second on the cylinder, it is characterized in that, the center line in said flange bolt hole is positioned at the intersection point and outer casing wall center line and horizontal flange intersection point scope of cylinder body outer shroud camber line and horizontal flange.
2. second cylinder body horizontal flange large ratio of height to width flange is characterized in that on the steam turbine as claimed in claim 1, on the said horizontal flange or under second the ratio of flange height and the width of cylinder first or cylinder in 1.45～1.65 scopes.
3. second cylinder body horizontal flange large ratio of height to width flange on according to claim 1 or claim 2 the steam turbine is characterized in that the ratio of said flange bolt hole location dimension and flange width is in 1～1.25 scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205324386U CN202348355U (en) | 2011-12-16 | 2011-12-16 | High height-width ratio horizontal joint flange for upper and lower half cylinder bodies of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205324386U CN202348355U (en) | 2011-12-16 | 2011-12-16 | High height-width ratio horizontal joint flange for upper and lower half cylinder bodies of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202348355U true CN202348355U (en) | 2012-07-25 |
Family
ID=46537364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205324386U Expired - Fee Related CN202348355U (en) | 2011-12-16 | 2011-12-16 | High height-width ratio horizontal joint flange for upper and lower half cylinder bodies of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202348355U (en) |
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 |
| CN112228169A (en) * | 2020-09-01 | 2021-01-15 | 中核核电运行管理有限公司 | Split assembling method for high-pressure outer cylinder of nuclear turbine |
-
2011
- 2011-12-16 CN CN2011205324386U patent/CN202348355U/en not_active Expired - Fee Related
Cited By (3)
| 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 |
| CN112228169A (en) * | 2020-09-01 | 2021-01-15 | 中核核电运行管理有限公司 | Split assembling method for high-pressure outer cylinder of nuclear turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20191216 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |