An integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine

Abstract

This invention relates to an integrated structure for the high- and intermediate-pressure inner cylinder of a steam turbine, specifically within the field of steam turbine technology. It addresses the problem that existing designs with a single rotating wall thickness on the vertical split surface result in greater vertical deformation than horizontal deformation during thermal expansion, thus affecting the design of radial clearance. This invention comprises two cylinder bodies formed by vertically slicing the high- and intermediate-pressure inner cylinder. Each cylinder body has two vertical split surfaces, and flanges are connected to the cylinder bodies. Reinforcing ribs are provided on the outer walls of the vertical split surfaces, extending axially from one end to the other. By incorporating through-type reinforcing ribs on the outer walls of the vertical split surfaces, the rigidity of the vertical split surfaces is improved, thereby meeting strength requirements and ensuring uniform deformation of the cylinder body in all directions during operation, providing a fundamental guarantee for the safe operation of the unit.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to an integrated structure of the high and medium pressure inner cylinder of a steam turbine. Background Technology

[0002] The high-pressure inner cylinder of a steam turbine is usually divided into two halves along the horizontal split plane and secured by a flange bolt structure.

[0003] The high-pressure inner cylinder has a flange at the horizontal split surface. The flange is quite heavy. When the high-pressure inner cylinder is running, it will expand due to heat. If the high-pressure inner cylinder is cut vertically, it will form two cylinder bodies. At this time, a vertical split surface is formed on the cylinder body. The original design of the vertical split surface has only one rotation wall thickness. The rigidity of the vertical split surface is insufficient. Under the influence of the flange, the deformation amplitude in the vertical direction is greater than the deformation amplitude in the horizontal direction, thus affecting the design of the radial clearance.

[0004] In summary, the existing vertical split surface design has only one rotational wall thickness. When heated and expanded, the deformation amplitude in the vertical direction is greater than that in the horizontal direction, which affects the design of the radial clearance. Utility Model Content

[0005] The purpose of this invention is to solve the problem that existing vertical split-plane designs have only one rotational wall thickness, resulting in a larger deformation amplitude in the vertical direction than in the horizontal direction when heated, thus affecting the design of the radial clearance. Therefore, this invention provides an integrated structure for the high- and intermediate-pressure inner cylinder of a steam turbine.

[0006] The technical solution of this utility model is: an integrated structure of a high-pressure and intermediate-pressure inner cylinder of a steam turbine, comprising: two cylinder bodies formed by cutting the high-pressure and intermediate-pressure inner cylinder along the vertical direction, each cylinder body having two vertical dividing surfaces;

[0007] A flange is connected to the cylinder body;

[0008] The outer wall of the cylinder body at the vertical split surface is provided with reinforcing ribs, which extend axially from one end of the cylinder body to the other end.

[0009] Furthermore, the reinforcing rib is a continuous structure arranged along the axial direction.

[0010] Furthermore, the annular plate on the outer wall of the cylinder has a clearance groove for passing through the reinforcing rib.

[0011] Furthermore, the reinforcing rib is integrally formed with the cylinder body.

[0012] Furthermore, the height of the reinforcing rib is the same as the radial thickness of the flange.

[0013] Furthermore, the cross-section of the reinforcing rib along the radial direction is rectangular, and one side of the rectangle is an inwardly concave arc edge.

[0014] Furthermore, the reinforcing rib has an arcuate surface for connecting with the side of the cylinder body.

[0015] Furthermore, the thickness of the reinforcing rib in the circumferential direction remains constant along the axial direction.

[0016] Furthermore, the reinforcing rib has outwardly extending positioning blocks.

[0017] Furthermore, the positioning blocks have at least two that are spaced apart along the axial direction.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The integrated structure of the high-pressure inner cylinder of the steam turbine provided by this utility model has a through-type design for reinforcing ribs on the outer wall of the vertical split surface of the cylinder body, which can improve the rigidity of the vertical split surface and thus meet the strength requirements. This ensures that the cylinder body deforms uniformly in all directions when heated during operation, providing a basic guarantee for the safe operation of the unit. Attached Figure Description

[0020] Figure 1 This is a sectional view of the overall structure of this utility model;

[0021] Figure 2 yes Figure 1 A partial side view.

[0022] In the diagram: 1. Cylinder body; 2. Vertical split surface; 3. Flange; 4. Reinforcing rib; 5. Annular plate; 6. Clearance groove; 7. Arc-shaped surface; 8. Positioning block. Detailed Implementation

[0023] Specific implementation method one: Combining Figure 1 , Figure 2 This embodiment describes two cylinder bodies 1 formed by vertically cutting the high-pressure inner cylinder. Each cylinder body 1 has two vertical split surfaces 2. A flange 3 is connected to the cylinder body 1. The outer wall of the vertical split surface 2 of the cylinder body 1 is provided with reinforcing ribs 4. The reinforcing ribs 4 extend axially from one end of the cylinder body 1 to the other end. It should be noted that each cylinder body 1 has two reinforcing ribs 4. In this embodiment, the axial and radial directions are based on the cylinder body 1. The two cylinder bodies 1 are schematic diagrams of the cut structure and are not two separate parts.

[0024] The integrated high-pressure inner cylinder structure of the steam turbine in this embodiment has a reinforcing rib 4 on the outer wall of the vertical split surface 2 on the cylinder body 1. The reinforcing rib 4 adopts a through-through design, which can improve the rigidity of the vertical split surface 2, thereby meeting the strength requirements and ensuring that the cylinder body 1 deforms uniformly in all directions when heated during operation, thus providing a basic guarantee for the safe operation of the unit.

[0025] Specific Implementation Method Two: Combining Figure 1 This embodiment differs from specific embodiment one in that the reinforcing rib 4 is a continuous structure arranged along the axial direction. A continuous structure has higher strength and a better effect on improving the stiffness of the vertical dividing surface 2. As an alternative embodiment, the reinforcing rib 4 can also be multiple ribs spliced ​​together sequentially. Other components and connections are the same as in specific embodiment one.

[0026] Specific implementation method three: Combining Figure 1 This embodiment differs from specific embodiment one in that the annular plate 5 on the outer wall of the cylinder 1 has a clearance groove 6 for the reinforcing rib 4 to pass through. The clearance groove 6 ensures that the reinforcing rib 4 and the annular plate 5 do not interfere with each other, allowing each part to perform its corresponding function. As an alternative embodiment, the clearance groove 6 can also be provided on the surface of the reinforcing rib 4. Other components and connections are the same as in specific embodiment two.

[0027] Specific implementation method four: Combination Figure 1 This embodiment differs from specific embodiment one in that the reinforcing rib 4 and the cylinder body 1 are integrally formed. The reinforcing rib 4 is machined simultaneously during the rough machining of the cylinder body 1, resulting in higher strength and better performance due to the integral forming. As an alternative embodiment, the reinforcing rib 4 can also be welded to the cylinder body 1. Other components and connections are the same as in specific embodiment one.

[0028] Specific Implementation Method Five: Combining Figure 1 This embodiment differs from specific embodiment one in that the height of the reinforcing rib 4 is the same as the radial thickness of the flange 3. This arrangement optimizes the weight ratio between the reinforcing rib 4 and the flange 3, resulting in the best stiffness improvement. Other components and connections are the same as in specific embodiment one.

[0029] Specific Implementation Method Six: Combination Figure 1 This embodiment differs from Specific Embodiment 1 in that the reinforcing rib 4 has a rectangular cross-section along the radial direction, with one side of the rectangle being an inwardly concave arc edge. The reinforcing rib 4 has a larger radial width, resulting in a larger contact area with the cylinder body 1, further enhancing the rigidity of the vertical split surface 2. Other components and connections are the same as in Specific Embodiment 1.

[0030] Specific implementation method seven: Combining Figure 1This embodiment differs from specific embodiment one in that the reinforcing rib 4 has an arc-shaped surface 7 for connecting with the side of the cylinder body 1. The arc-shaped surface 7 provides a smoother connection without protrusions, reducing safety hazards. Other components and connections are the same as in any one of specific embodiments one through six.

[0031] Specific implementation method eight: Combination Figure 1 This embodiment differs from Specific Embodiment 1 in that the thickness of the reinforcing rib 4 remains constant along the axial direction in the circumferential direction. The reinforcing rib 4 is elongated and strip-shaped, facilitating manufacturing. Other components and connections are the same as in Specific Embodiment 1.

[0032] Specific Implementation Method Nine: Combining Figure 1 , Figure 2 This embodiment differs from specific embodiment one in that the reinforcing rib has an outwardly protruding positioning block 8. The positioning block 8 is used to position and engage with the outer cylinder to prevent the inner cylinder from rotating in the circumferential direction. Other components and connections are the same as in any of specific embodiments one to eight.

[0033] Specific Implementation Method Ten: Combining Figure 1 , Figure 2 This embodiment differs from specific embodiment nine in that it has at least two positioning blocks 8 spaced apart along the axial direction. In this embodiment, there are two positioning blocks 8, which are used for positioning and engagement, resulting in better positioning performance. Other components and connections are the same as in specific embodiment nine.

[0034] The content of this utility model is not limited to the above-described embodiments; a combination of one or more specific embodiments can also achieve the purpose of the utility model.

Claims

1. An integrated structure for the high- and intermediate-pressure inner cylinder of a steam turbine, characterized in that, include: Two cylinder bodies (1) are formed by cutting the high-pressure inner cylinder in the vertical direction, and each cylinder body (1) has two vertical dividing surfaces (2); A flange (3) is connected to the cylinder body (1); The outer wall of the cylinder body (1) at the vertical dividing surface (2) is provided with a reinforcing rib (4), which extends axially from one end of the cylinder body (1) to the other end.

2. The integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine according to claim 1, characterized in that, The reinforcing rib (4) is a continuous structure arranged along the axial direction.

3. The integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine according to claim 2, characterized in that, The annular plate (5) on the outer wall of the cylinder (1) has a clearance groove (6) for passing through the reinforcing rib (4).

4. The integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine according to claim 1, characterized in that, The reinforcing rib (4) and the cylinder body (1) are integrally formed.

5. The integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine according to claim 1, characterized in that, The height of the reinforcing rib (4) is the same as the radial thickness of the flange (3).

6. The integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine according to claim 1, characterized in that, The cross-section of the reinforcing rib (4) along the radial direction is a rectangle, and one side of the rectangle is an inwardly concave arc edge.

7. The integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine according to claim 1, characterized in that, The reinforcing rib (4) has an arc-shaped surface (7) for connecting with the side of the cylinder body (1).

8. The integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine according to claim 1, characterized in that, The thickness of the reinforcing rib (4) in the circumferential direction remains constant along the axial direction.

9. A steam turbine high-pressure and intermediate-pressure integrated cylinder structure according to any one of claims 1-8, characterized in that, The reinforcing rib has an outwardly protruding positioning block (8).

10. The integrated structure of the high-pressure and intermediate-pressure inner cylinder of a steam turbine according to claim 9, characterized in that, The positioning block (8) has at least two that are spaced apart along the axial direction.

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