CN115263453A - Support structure of back pressure steam turbine nozzle chamber and inner cylinder - Google Patents
Support structure of back pressure steam turbine nozzle chamber and inner cylinder Download PDFInfo
- Publication number
- CN115263453A CN115263453A CN202210812984.8A CN202210812984A CN115263453A CN 115263453 A CN115263453 A CN 115263453A CN 202210812984 A CN202210812984 A CN 202210812984A CN 115263453 A CN115263453 A CN 115263453A
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- Prior art keywords
- nozzle chamber
- inner cylinder
- cylinder
- outer cylinder
- positioning
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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
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a supporting structure of a nozzle chamber and an inner cylinder of a back pressure steam turbine, wherein the nozzle chamber and the inner cylinder are welded at the bottom of an outer cylinder, the nozzle chamber and the inner cylinder are axially and circumferentially positioned through the outer cylinder, a circumferential positioning structure is welded on the outer cylinder by adopting a positioning pin plate, circumferential positioning is completed through a hole, the nozzle chamber and the inner cylinder, and the axial positioning structure axially positions the outer cylinder, the nozzle chamber and the front part of the middle section of the inner cylinder through a cylindrical head hexagon socket screw, an adjusting bush and a gasket. The invention meets the requirements of high-temperature and back-pressure type high-power-density industrial steam turbine cylinder positioning and support compactness.
Description
Technical Field
The invention belongs to the energy power industry, and particularly relates to a method for installing and positioning an outer cylinder, a nozzle chamber and an inner cylinder of a high-temperature back-pressure industrial steam turbine in a novel supporting mode of the nozzle chamber and the inner cylinder. The method has the characteristics of compact rhythm, quick installation and convenient processing.
Background
The back pressure type high rotation speed industrial steam turbine has high temperature characteristic, and the cylinder structure includes outer cylinder, nozzle chamber and inner cylinder, the nozzle chamber is cast integrally and fixed to the inner cylinder via peripheral screw bolt before the outer cylinder and the inner cylinder after the outer cylinder. The original high back pressure support structure only supports the nozzle chamber for the outer cylinder. Considering that the axial length of a cylinder in the novel backpressure unit is lengthened, the original supporting mode is not enough to ensure the stable operation of the unit. The outer cylinder support, positioning of the nozzle chamber and inner cylinder, and thermal expansion during operation are critical to this type of structural design. In order to better satisfy the requirement that the compact structure of the high-back-pressure steam turbine reduces the weight of the body, the method for simplifying the supporting structure of the inner cylinder and the outer cylinder of the steam turbine is a research content which needs to be improved and optimized urgently.
Disclosure of Invention
The invention aims to design a supporting structure of a nozzle chamber and an inner cylinder of a high-power-density back pressure steam turbine, meet the positioning requirements of the nozzle chamber and the inner cylinder of the steam turbine, and simplify the supporting structure of an outer cylinder for the nozzle chamber and the inner cylinder.
The purpose of the invention is realized as follows: the nozzle chamber and the inner cylinder are welded at the bottom of the outer cylinder, the nozzle chamber and the inner cylinder are axially and circumferentially positioned through the outer cylinder, the circumferential positioning structure is welded on the outer cylinder by adopting a positioning pin plate, the circumferential positioning is completed through the hole, the nozzle chamber and the inner cylinder, and the axial positioning structure axially positions the front parts of the midportion of the outer cylinder, the nozzle chamber and the inner cylinder through a cylindrical head hexagon socket head screw, an adjusting bush and a gasket.
The invention also comprises the following structural features:
1. and a positioning key plate connected with the nozzle chamber and the inside cylinder.
Compared with the prior art, the invention has the beneficial effects that: the invention designs two groups of lugs at the front part and the rear part of the outer cylinder respectively, which are symmetrical along the two sides of the axis and support the nozzle chamber and the front part and the rear part of the inner cylinder. Ensuring the even stress. The stable operation of the turbine under the condition of thermal expansion is ensured by arranging the clearance between the inner cylinder and the outer cylinder. The positioning size can be rapidly adjusted through the grinding gap. The invention meets the requirements of high-temperature and back-pressure type high-power-density industrial steam turbine cylinder positioning and support compactness.
Drawings
FIGS. 1a and 1b are both schematic support views;
FIG. 2 is a view showing the structure of a support washer, an adjustment cushion cover, and a socket head cap screw;
FIG. 3 is a view showing a structure of a spacer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
With reference to fig. 1a to 3, the outer cylinder is oriented primarily axially and circumferentially with respect to the nozzle chamber and the inner cylinder. The positioning and supporting fully considers the requirements of uniform stress and thermal expansion. Because the axial size of the inner cylinder is lengthened, two groups of lugs are required to be added at the rear part of the outer cylinder along the axial direction to be used as supports in order to avoid the occurrence of cantilever beam conditions. The positioning and supporting also need to consider the requirements of uniform stress and thermal expansion. The circumferential positioning structure is welded on the outer cylinder by adopting a positioning pin plate, and the circumferential positioning is completed through the hole and the nozzle chamber and the inner cylinder.
The axial positioning structure axially positions the front part of the split surface of the outer cylinder, the nozzle chamber and the inner cylinder through a cylindrical head inner hexagon screw, an adjusting bush and a gasket. The height of the bushing is adjusted by grinding to ensure the gap between the top of the bushing and the middle facet of the nozzle chamber. And designing a positioning key plate structure, wherein the nozzle chamber falls into the lower half of the outer cylinder, and after the positioning key plate is registered with the total gaps on the two sides of the nozzle chamber, the contact area of the positioning key plate and the outer cylinder is ensured. The rear axial support adopts the same structure, and an adjusting gasket is added. The front and the rear are supported on the same bisection plane by correcting the thickness of the support. It can be judged that the force is uniformly applied.
And (3) designing a positioning pin plate 3 structural part by combining the drawings 1a and 1b, and welding the structural part and the nozzle chamber and inner cylinder 2 assembly at the bottom of an outer cylinder of the part 1 after circumferential adjustment of a phi 38 hole in the final assembly process so as to ensure circumferential positioning. And simultaneously, the gap between the positioning pin plate and the nozzle chamber is ensured to be fully expanded.
Referring to fig. 1a and 2, a socket head cap screw 7, an adjusting bush 6, and a gasket structure 5 are provided to be combined at both sides of a central plane of a front portion of the outer cylinder 1 for supporting the nozzle chamber and the inner cylinder 2. The height of the bush is adjusted by an adjusting cushion cover (a coping piece) 6 to ensure the clearance between the top of the bush and the middle facet of the nozzle chamber. And designing a positioning key plate 4 structure, enabling the nozzle chamber to fall into the lower half of the outer cylinder, after the positioning key plate is registered with the total gaps on the two sides of the nozzle chamber, ensuring that the clearance gauge with the contact area of the outer cylinder is larger than 50% and 0.1mm cannot enter, and welding and fixing after the clearance gauge is checked to be qualified. The axial positioning of the outer cylinder and the nozzle chamber is ensured.
With reference to fig. 1 a-3, because the inner cylinder is lengthened in axial dimension, the lugs are arranged at the same axial position, the same socket head cap screws 7, the adjusting bushings 6 and the gasket structures 5 are adopted, and are combined on two sides of the rear part surface of the outer cylinder for supporting and positioning the inner cylinder. In order to ensure even stress and the same expansion amount clearance, an adjusting gasket 8 is designed to ensure that corresponding adjusting allowance is provided, so that the front and rear supports of the outer cylinder to the nozzle chamber and the inner cylinder 2 are on the bisection plane.
The invention relates to a supporting structure of a nozzle chamber and an inner cylinder of a high-power-density back pressure steam turbine, which comprises the following steps:
1. analyzing the supporting and positioning requirements of the outer cylinder on the nozzle chamber and the inner cylinder;
2. the structure which is simple in design and connection with the cylinder, convenient to adjust and process and convenient to install meets the requirements of axial positioning and circumferential positioning among cylinders, integration optimization is carried out, and the overall structure is confirmed;
3. designing a circumferential supporting structure of the outer cylinder to the nozzle chamber and the inner cylinder;
4. and designing an axial supporting structure of the outer cylinder to the nozzle chamber and the inner cylinder.
The invention relates to a stable and reliable supporting structure for a nozzle chamber and an inner cylinder of a high-power-density back pressure steam turbine. By designing the structures such as the socket head cap screws, the adjusting bushes, the gaskets, the positioning pin plates and the like, the front and back axial and circumferential support of the inner cylinder and the nozzle chamber is realized, and the stress is more uniform. And meanwhile, a reasonable gap is arranged, so that the stable operation of the steam turbine due to thermal expansion is ensured. The requirements of high temperature and back pressure type high power density industrial steam turbine cylinder positioning and support compactness are met, and good maintainability and reliability are achieved.
The key points of the invention are as follows:
1. novel integral support structure of high power density backpressure steam turbine.
2. Novel circumferential support structure of high power density backpressure steam turbine.
3. Novel axial bearing structure of high power density backpressure steam turbine.
4. The gap between the inner cylinder and the outer cylinder is arranged to ensure the stable operation of the turbine due to thermal expansion, and the setting size can be quickly adjusted by grinding the gap.
Claims (2)
1. The utility model provides a bearing structure of backpressure steam turbine nozzle room and interior cylinder which characterized in that: the nozzle chamber and the inner cylinder are welded at the bottom of the outer cylinder, the nozzle chamber and the inner cylinder are axially and circumferentially positioned through the outer cylinder, the circumferential positioning structure is welded on the outer cylinder by adopting a positioning pin plate, the circumferential positioning is completed through the hole, the nozzle chamber and the inner cylinder, and the axial positioning structure axially positions the front parts of the midportion of the outer cylinder, the nozzle chamber and the inner cylinder through a cylindrical head hexagon socket head screw, an adjusting bush and a gasket.
2. The support structure for the nozzle chamber and the inner cylinder of the back pressure turbine according to claim 1, wherein: and a positioning key plate connected with the nozzle chamber and the inside cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210812984.8A CN115263453A (en) | 2022-07-11 | 2022-07-11 | Support structure of back pressure steam turbine nozzle chamber and inner cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210812984.8A CN115263453A (en) | 2022-07-11 | 2022-07-11 | Support structure of back pressure steam turbine nozzle chamber and inner cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115263453A true CN115263453A (en) | 2022-11-01 |
Family
ID=83765294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210812984.8A Pending CN115263453A (en) | 2022-07-11 | 2022-07-11 | Support structure of back pressure steam turbine nozzle chamber and inner cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115263453A (en) |
-
2022
- 2022-07-11 CN CN202210812984.8A patent/CN115263453A/en active Pending
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