An axial support structure between a low-pressure inner cylinder and a steam inlet chamber

Abstract

This utility model discloses an axial support structure between a low-pressure inner cylinder and a steam inlet chamber, relating to the field of steam turbine design. It includes a low-pressure inner cylinder, end panels, and a steam inlet chamber. Support columns are arranged circumferentially along the inner diameter of the end panels. Inner rods are arranged circumferentially between the end panels, with the inner rods and support columns staggered. An outer rod corresponding to the inner rod is located on one side of the end panels facing away from each other. A wall plate corresponding to the outer rod is arranged circumferentially along the low-pressure inner cylinder, with a certain gap between the wall plate and the outer rod. Reinforcing ribs are provided between the end panels. An outer rod corresponding to the reinforcing rib is located on one side of the end panels facing away from each other. A flange is located at the midpoint of the end panels, with an inner rod between the two flanges. A flange support boss corresponding to the inner rod is located on one side of the two flanges facing away from each other. This application improves the overall rigidity of the low-pressure inner cylinder.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine design, and in particular to an axial support structure between the low-pressure inner cylinder and the steam inlet chamber. Background Technology

[0002] Currently, the low-pressure inner cylinder of the steam turbine is equipped with an inlet chamber. The axial distance between the inlet chamber and the low-pressure inner cylinder is relatively large in order to control the large thermal deformation of the low-pressure inner cylinder due to the temperature gradient.

[0003] For related technology, please refer to Chinese Patent No. CN2072799922U, which discloses a low-pressure inner cylinder of a steam turbine and a steam turbine using the same. The low-pressure inner cylinder of the steam turbine includes an inlet steam chamber, a first-stage extraction steam chamber, and a second-stage extraction steam chamber. The first-stage extraction steam chamber is symmetrically arranged on both sides of the inlet steam chamber, and the left and right parts on both sides are connected inside the inlet steam chamber. The second-stage extraction steam chamber is symmetrically arranged on both sides of the first-stage extraction steam chamber, and the left and right parts on both sides are connected outside the low-pressure inner cylinder of the steam turbine.

[0004] Because the low-pressure inner cylinder and the steam inlet chamber are assembled structures, the axial constraint near the steam inlet center is free. This structure is characterized by strong overall rigidity of the low-pressure inner cylinder and axial free constraint at the end-adjusting baffle groove in the first chamber. This means that axial displacement caused by large axial temperature differences during operation is concentrated at the end-adjusting baffle groove in the first chamber, and the displacement direction is towards the steam inlet center, with a relatively large axial displacement. This explains why the low-pressure inner cylinder has strong overall rigidity, but axial constraint is free at the end-adjusting baffle groove of the first low-pressure baffle, where axial deformation is greatest. Due to deformation, the mid-section of the low-pressure inner cylinder has an inward opening at the mid-section of the steam baffle plate of the first low-pressure baffle, causing steam leakage at this mid-section.

[0005] Therefore, there is an urgent need for an axial support structure that can improve the overall rigidity of the steam inlet chamber and the low-pressure inner cylinder, limit hot deformation, and alleviate steam leakage at the split surface, so as to meet the sealing reliability requirements of the steam turbine under high temperature and temperature difference conditions. Utility Model Content

[0006] To improve the overall rigidity of the low-pressure inner cylinder, this application provides an axial support structure between the low-pressure inner cylinder and the steam inlet chamber.

[0007] This application provides an axial support structure between the low-pressure inner cylinder and the steam inlet chamber, adopting the following technical solution: An axial support structure between a low-pressure inner cylinder and an inlet chamber includes a low-pressure inner cylinder and an inlet chamber installed inside the low-pressure inner cylinder. The low-pressure inner cylinder is divided into an upper cylinder and a lower cylinder along a horizontal plane. The low-pressure inner cylinder is provided with two parallel end panels coaxially. The inlet chamber is located between the two end panels. A flange one for connecting the upper cylinder and the lower cylinder is provided at the split surface of the low-pressure inner cylinder. A flange two opposite to flange one is provided at the split surface of the end panels. A support device for fixing the end panels is arranged circumferentially between the two end panels.

[0008] By adopting the above technical solution, the low-pressure inner cylinder supports the end panels through a support device, and the two end panels accommodate the steam inlet chamber. The upper and lower cylinders are connected by flange one, which reduces the probability of steam leakage along the split surface of the low-pressure inner cylinder. Flange two connects the end panels, which reduces the probability of steam leakage along the split surface of the end panels. The support device forms a rigid structure between the two end panels, which reduces the probability of deformation of the end panels due to axial displacement caused by temperature gradient when high-temperature steam enters the steam inlet chamber, thus improving the overall rigidity of the low-pressure inner cylinder.

[0009] Optionally, the support device includes several inner rods, which are evenly distributed between the two end panels, and the two ends of the inner rods are fixedly connected to the two end panels respectively.

[0010] By adopting the above technical solution, several inner rods simultaneously support and fix the two end panels, thereby forming a rigid support space between the end panels. This makes the two end panels relatively fixed, reducing the probability of deformation of the end panels when high-temperature steam enters the steam inlet chamber, which is beneficial to improving the stability of the device structure.

[0011] Optionally, an outer rod corresponding to the inner rod is fixed on one side of the end panels that are far apart from each other, and a wall plate is provided in the low-pressure inner cylinder that is directly opposite the outer rod, with a certain gap between the outer rod and the wall plate.

[0012] By adopting the above technical solution, in the operating state of the device, the outer rod is rigidly supported by the wall plate and the low-pressure inner cylinder, so that a rigid structure is formed between the end panel and the low-pressure inner cylinder. The inner rod and the outer rod work together to provide axial support for the two end panels. Under the support of the low-pressure inner cylinder, it is beneficial to reduce the probability of the two end panels deforming along the axial direction and causing an inner opening.

[0013] Optionally, the two axially facing flanges are provided with flange support bosses on opposite sides, and the side of the flange support bosses away from flanges is fixedly connected to flange one.

[0014] By adopting the above technical solution, the flange support boss connects and fixes flange one and flange two that are directly opposite each other along the axial direction, which helps to improve the connection stability of flange one and flange two, thereby improving the stability of the device structure and reducing the probability of steam leakage along the split surface of the device.

[0015] Optionally, a number of reinforcing ribs are provided between the two end panels, and the reinforcing ribs are fixedly connected to both end panels. On the opposite side of the two end panels, an outer rod is fixedly provided that is directly opposite to the reinforcing ribs.

[0016] By adopting the above technical solution, the reinforcing plate supports and fixes the two end faces radially, reducing the space where relative displacement can occur between the two end panels. The outer rod and the reinforcing plate work together to provide axial support for the two end panels, which helps to improve the stability of the overall structure of the device and its ability to resist thermal deformation.

[0017] Optionally, a plurality of support columns are arranged circumferentially along the inner diameter of the end panel, and the support columns are located between the two end panels and are parallel to the inner rod.

[0018] By adopting the above technical solution, the support column reinforces the connection between the two end panels along the circumferential direction, which helps to improve the structural rigidity between the end panels and reduce the probability of structural separation and steam leakage in the low-pressure inner cylinder due to thermal deformation when high-temperature steam enters the low-pressure inner cylinder.

[0019] Optionally, the inner rod and outer rod are integrally formed to form a through column, which passes through the two end panels and is fixedly connected to the two end panels and the low-pressure inner cylinder.

[0020] By adopting the above technical solution, the through column fixes and connects the two end panels. The two end panels restrict each other's horizontal displacement through the through column, reducing the probability of misalignment between the two end panels. The low-pressure inner cylinder limits the end panels through the through column, which helps to improve the stability of the device structure.

[0021] Optionally, the side of the end panel facing away from each other is provided with a support rib corresponding to the second flange, and the side of the support rib away from the end panel is fixedly connected to the low-pressure inner cylinder.

[0022] By adopting the above technical solution, the support ribs provide axial support to the two end panels and connect and fix the flange one and flange two that are axially opposite to each other along the low-pressure inner cylinder, which helps to improve the overall stability of the structure and reduce the probability of steam leakage along the split surface of the device.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The low-pressure inner cylinder is supported by a support device for the end panels. The two end panels accommodate the steam inlet chamber. The upper and lower cylinders are connected by flange one, which reduces the probability of steam leakage along the split surface of the low-pressure inner cylinder. Flange two is connected to the end panels, which reduces the probability of steam leakage along the split surface of the end panels. The support device forms a rigid structure between the two end panels, which reduces the probability of deformation of the end panels due to axial displacement caused by temperature gradient when high-temperature steam enters the steam inlet chamber, thus improving the overall rigidity of the low-pressure inner cylinder. 2. Several internal rods simultaneously support and fix the two end panels, thereby forming a rigid support space between the end panels, which in turn fixes the two end panels relatively, reducing the probability of deformation of the end panels when high-temperature steam enters the steam inlet chamber, and helping to improve the stability of the device structure. 3. When the device is in operation, the outer rod is rigidly supported by the wall plate and the low-pressure inner cylinder, so that a rigid structure is formed between the end panel and the low-pressure inner cylinder. The inner rod and the outer rod work together to provide axial support for the two end panels. Under the support of the low-pressure inner cylinder, it is beneficial to reduce the probability of the two end panels deforming along the axial direction and causing an inward opening. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of Example 1.

[0025] Figure 2 This is a cross-sectional schematic diagram of the low-pressure inner cylinder.

[0026] Figure 3 This is a structural diagram of outer rod one and outer rod two.

[0027] Figure 4 This is a schematic diagram of the structure of Example 2.

[0028] Explanation of reference numerals in the attached drawings: 1. Low-pressure inner cylinder; 11. Flange 1; 12. Wall panel; 13. Groove; 2. End panel; 21. Flange 2; 22. Inner rod; 23. Outer rod 1; 24. Flange support boss; 25. Reinforcing rib; 26. Outer rod 2; 27. Support rib; 28. Shoulder; 3. Steam inlet chamber; 31. Support column; 4. Through column; Detailed Implementation The present application will be further described in detail below with reference to all the accompanying drawings.

[0029] This application discloses an axial support structure between a low-pressure inner cylinder and an intake chamber.

[0030] Example 1 Reference Figure 1 and Figure 2An axial support structure between a low-pressure inner cylinder and an inlet chamber includes a low-pressure inner cylinder 1 and two parallel end panels 2. The end panels 2 are located inside the low-pressure inner cylinder 1 and are coaxially fixedly connected to the low-pressure inner cylinder 1. The outer diameter of the end panels 2 is provided with a shoulder 28 along the circumferential direction. The inner diameter of the low-pressure inner cylinder 1 is provided with a groove 13 along the circumferential direction to accommodate the shoulder 28. The shoulder 28 is inserted into the groove 13 so that the low-pressure inner cylinder 1 supports and fixes the end panels 2, which helps to improve the stability of the device structure.

[0031] Reference Figure 1 and Figure 2 In the installed state, the low-pressure inner cylinder 1 is divided into an upper cylinder and a lower cylinder along the horizontal plane. The upper cylinder and the lower cylinder are equipped with flange 11 and flange bolts 1 that are compatible with flange 11 on their respective end faces. The upper cylinder and the lower cylinder are fixed by flange 11. Flange 11 helps to improve the tightness of the connection between the upper cylinder and the lower cylinder and reduces the probability of gas leakage along the split surface of the low-pressure inner cylinder 1.

[0032] Reference Figure 1 and Figure 2 In the installed state, end panel 2 is divided into an upper panel and a lower panel along the horizontal plane. Flange 21 and flange bolt 2 are installed on the side of the upper panel and the lower panel that are close to each other. Flange bolt 2 is compatible with flange compass 2. The upper panel and the lower panel are connected and fixed by flange 21. Flange 21 helps to improve the stability of the connection between the upper panel and the lower panel, reduces the probability of gas leakage in end panel 2, and helps to improve the stability and safety of the device.

[0033] Reference Figure 1 and Figure 2 A reinforcing rib 25 is welded between the upper panel and the lower panel. Both reinforcing ribs 25 are located in the middle of the upper panel and the lower panel and are on the same straight line. The reinforcing ribs 25 are arranged radially along the end panel 2 to support and reinforce the end panel 2 radially, which helps to improve the stability of the overall structure of the device and its resistance to thermal deformation.

[0034] Reference Figure 2 and Figure 3 Multiple support points are evenly distributed circumferentially between the two end panels 2. In this embodiment, 14 support points are provided. In other embodiments, the number of support points may also be different. The 14 support points are evenly distributed circumferentially between the end panels 2, and each flange 21 and reinforcing rib 25 corresponds to one support point. An inner rod 22 corresponding to the support point is welded between the two end panels 2. The inner rod 22 is parallel to the axis of the end panel 2 and supports the end panels 2.

[0035] Reference Figure 2 and Figure 3An outer rod 23, corresponding to the inner rod 22, is welded to one side of each of the two end panels 2 facing away from each other. The outer rod 23 is located between the end panel 2 and the low-pressure inner cylinder 1. A wall plate 12, corresponding to the outer rod 23, is provided on the side of the low-pressure inner cylinder 1 near the end panel 2. A gap is left between the outer rod 23 and the wall plate 12. In this embodiment, the gap is 0.5 mm. In other embodiments, the gap can be other values. When the device is running, the end panel 2 and the low-pressure inner cylinder 1 are in rigid contact along the axial direction, so that all parts of the low-pressure inner cylinder 1 are integrated, thereby expanding axially uniformly, reducing the probability of excessive axial deformation of the low-pressure inner cylinder 1 causing internal opening, and improving the airtightness of the split surface of the low-pressure inner cylinder 1.

[0036] Reference Figure 2 and Figure 3 An inner rod 22 connects and supports the two flanges 21 that are axially aligned with each other on the end panel 2. A flange support boss 24 corresponding to the inner rod 22 is provided on the opposite side of the end panel 2. The side of the flange support boss 24 opposite to the end panel 2 is directly opposite to the wall plate 12 of the low-pressure inner cylinder 1 and leaves a gap of 0.5 mm between it and the wall plate 12. When the device is running, the flange support boss 24 is in rigid contact with the wall plate 12, which makes the low-pressure cylinder expand uniformly along the axis, reduces the probability of deformation of the low-pressure cylinder in the circumferential direction, and helps to improve the stability of the device and the airtightness of the split surface of the low-pressure cylinder.

[0037] Reference Figure 2 and Figure 3 Multiple support columns 31 are welded circumferentially along the inner diameter of the end panel 2. The support columns 31 are parallel to the axis of the end panel 2. The support columns 31 support and fix the two end panels 2, which helps to improve the structural stability of the two end panels 2 and reduce the probability of the two end panels 2 separating.

[0038] The implementation principle of the axial support structure between the low-pressure inner cylinder and the steam inlet chamber in this application embodiment is as follows: High-temperature steam enters the low-pressure inner cylinder 1 through the steam inlet chamber 3. The inner rod 22 and the support column 31 reinforce the two end panels 2, reducing the probability of the end panel 2 structure detaching. There are gaps between the outer rod 1 23 and the outer rod 26 and the wall plate 12, so that when the device is running, the outer rod is in rigid contact with the low-pressure inner cylinder 1 through the wall plate 12, thereby making the various parts of the low-pressure cylinder form a whole, thereby expanding uniformly along the axial direction, reducing the probability of excessive axial deformation in the low-pressure cylinder causing internal opening, and improving the airtightness of the low-pressure cylinder split surface and the structural rigidity of the device.

[0039] Example 2 The difference between this embodiment and embodiment 1 is that the inner rod 22 and the outer rod 23 are integrally formed to form the through column 4.

[0040] Reference Figure 4The through column 4 passes through the two end panels 2, making the two end panels 2 relatively fixed. The two ends of the through column 4 passing through the end panels 2 are respectively opposite to the wall plate 12, and a gap of 0.5mm is left between them. When the device is running, the through column 4 makes rigid contact with the low-pressure inner cylinder 1 through the wall plate 12, so that each part of the low-pressure inner cylinder 1 expands uniformly along the axial direction, reducing the probability of the low-pressure inner cylinder 1 deforming too much and causing an internal opening.

[0041] Reference Figure 4 The upper or lower panel is provided with a support rib 27 corresponding to the flange 21. The side of the support rib 27 away from the end panel 2 is directly opposite the wall panel 12. When the device is running, the support rib 27 is in rigid contact with the low-pressure inner cylinder 1 through the wall panel 12, thereby making the end panel 2 in rigid contact with the low-pressure inner cylinder 1, improving the overall rigidity and structural stability of the device.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An axial support structure between a low-pressure inner cylinder and an inlet chamber, comprising a low-pressure inner cylinder (1) and an inlet chamber (3) installed within the low-pressure inner cylinder (1), wherein the low-pressure inner cylinder (1) is divided into an upper cylinder and a lower cylinder along a horizontal plane, characterized in that: The low-pressure inner cylinder (1) is coaxially provided with two parallel end panels (2), and the steam inlet chamber (3) is located between the two end panels (2). The low-pressure inner cylinder (1) is provided with a flange one (11) for connecting the upper half cylinder and the lower half cylinder at the split surface. The end panel (2) is provided with a flange two (21) opposite to the flange one (11) at the split surface. A support device for fixing the end panels (2) is arranged circumferentially between the two end panels (2).

2. The axial support structure between the low-pressure inner cylinder and the steam inlet chamber according to claim 1, characterized in that: The support device includes several inner rods (22), which are evenly distributed between the two end panels (2), and the two ends of the inner rods (22) are fixedly connected to the two end panels (2) respectively.

3. The axial support structure between the low-pressure inner cylinder (1) and the steam inlet chamber according to claim 1, characterized in that: The end panel (2) is fixed with an outer rod (23) corresponding to the inner rod (22) on one side away from each other. The low-pressure inner cylinder (1) is provided with a wall plate (12) facing the outer rod (23). There is a certain gap between the outer rod (23) and the wall plate (12).

4. The axial support structure between the low-pressure inner cylinder and the steam inlet chamber according to claim 1, characterized in that: Two flanges (21) facing each other along the axial direction are provided with flange support bosses (24) on opposite sides. The side of the flange support bosses (24) away from flanges (21) is fixedly connected to flanges (11).

5. The axial support structure between the low-pressure inner cylinder and the steam inlet chamber according to claim 1, characterized in that: A number of reinforcing ribs (25) are provided between the two end panels (2). The reinforcing ribs (25) are fixedly connected to both end panels (2). On the opposite side of the two end panels (2), an outer rod (26) is fixedly provided, which is directly opposite to the reinforcing ribs (25).

6. The axial support structure between the low-pressure inner cylinder and the steam inlet chamber according to claim 1, characterized in that: Several support columns (31) are arranged circumferentially at the inner diameter of the end panel (2). The support columns (31) are located between the two end panels (2) and are parallel to the inner rod (22).

7. The axial support structure between the low-pressure inner cylinder and the steam inlet chamber according to claim 1, characterized in that: The inner rod (22) and the outer rod (23) are integrally formed to form a through column (4), which penetrates the two end panels (2) and is fixedly connected to the two end panels (2) and the low-pressure inner cylinder (1).

8. The axial support structure between the low-pressure inner cylinder and the steam inlet chamber according to claim 1, characterized in that: The end panel (2) is provided with a support rib (27) on the side opposite to each other, which corresponds to the flange two (21) that abuts against it. The side of the support rib (27) away from the end panel (2) is fixedly connected to the low-pressure inner cylinder (1).

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