Gas turbine and turbine inner and outer casing connecting structure thereof
By using the clearance coordination between positioning holes, sliding grooves, limit rings and sliding blocks in the internal and external receiver connection structure of the turbine, the problem of thermal deformation of the outer receiver and the inner receiver in high temperature environment is solved, and stable locking positioning and thermal deformation margin is achieved, which improves the reliability and life of the turbine.
Patent Information
- Application Number
- CN202422837469.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-11-20
AI Technical Summary
In high temperature environments, the outer receiver and the inner receiver of the turbine are easily connected by bolts to cause thermal deformation and inconsistency, resulting in the rotor and stator bumping or connection positioning failure.
The inner wall of the outer receiver is equipped with a positioning hole and a sliding groove, and the outer wall of the inner receiver is equipped with a sliding block and a limit ring. Through the positioning column and the limit ring gap, the sliding block and the sliding groove gap are used to achieve locking positioning of the outer receiver and the inner receiver, and reserve a thermal deformation allowance.
It reduces the probability of thermal deformation inconsistency between the outer receiver and the inner receiver, avoids rotor and stator collision and connection positioning failure, and improves the stability and service life of the turbine.
Smart Images
Figure CN223305799U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of gas turbines, and in particular to a gas turbine and a connection structure between inner and outer turbine casings thereof. Background Art
[0002] A turbine is a rotating power machine that converts the energy of a flowing medium into mechanical work. It is widely used in equipment such as automobiles, airplanes, ships, and gas turbines. In the application scenario of gas turbines, for example, Figure 1 As shown, a turbine generally includes an outer turbine ring (not shown) and an outer casing. The outer turbine ring and the outer casing must be connected via an intermediate casing (hereinafter referred to as the inner casing). In the prior art, the outer casing and the inner casing are fixedly connected by fastening bolts, and the inner casing is then connected to the outer turbine ring, thereby achieving the connection between the outer casing and the outer turbine ring. In the application scenario of a gas turbine, fuel and air burn in the combustion chamber to produce high-temperature combustion gas, which in turn drives the turbine to rotate and produce work. In other words, in this application scenario, the turbine is exposed to high temperatures for a long time. It is easy to understand that if the turbine is exposed to high temperatures for a long time, the bolted outer casing and the inner casing are prone to thermal deformation. If the outer casing and the inner casing are thermally deformed, it can easily lead to friction between the rotor and stator in the turbine. In severe cases, it can easily lead to failure of the connection between the outer casing and the inner casing, which can cause turbine failure. Utility Model Content
[0003] The purpose of this application is to provide a gas turbine and a connection structure between the inner and outer casings of the turbine thereof, so as to solve the technical problem that the outer casing and the inner casing connected by bolts are prone to thermal deformation and incoordination in high-temperature application scenarios.
[0004] To achieve the above objectives, this application provides the following technical solutions:
[0005] In a first aspect, the present application proposes a technical solution for a connection structure between an inner and outer casing of a turbine, the connection structure comprising:
[0006] An outer casing and an inner casing; the inner wall of the outer casing is provided with a positioning hole; the outer wall of the inner casing is provided with a sliding groove;
[0007] A first limiting ring and a second limiting ring; the first limiting ring and the second limiting ring are both arranged on the inner wall of the outer casing; a clearance fit is formed between the inner casing and the first limiting ring and the second limiting ring;
[0008] Positioning post; the positioning post forms a clearance fit with the positioning hole;
[0009] A sliding block is arranged at one end of the positioning column; the sliding block and the sliding groove form a clearance fit.
[0010] As a specific solution in the technical solution of the present application, the inner casing is an integrated circular ring structure.
[0011] As a specific solution in the technical solution of this application, the outer casing includes a first annular casing and a second annular casing; the first annular casing and the second annular casing form a detachable connection; the first limiting ring is arranged on the first annular casing; the second limiting ring is arranged on the second annular casing.
[0012] As a specific solution in the technical solution of this application, the outer wall of the first annular casing is provided with a first flange; the outer wall of the second annular casing is provided with a second flange; the first annular casing and the second annular casing are threadedly detachably connected through the first flange and the second flange.
[0013] As a specific solution in the technical solution of the present application, the turbine also includes a positioning pin; a first groove is provided at one end of the first annular casing facing the second annular casing; a second groove corresponding to the first groove is provided at one end of the second annular casing facing the first annular casing; the first groove and the second groove are spliced to form a positioning cavity; the positioning cavity is adapted to the positioning pin.
[0014] As a specific solution in the technical solution of the present application, the inner casing includes a first casing and a second casing that are adjacent to each other; a joint seam is formed between the first casing and the second casing; and the sliding block spans the joint seam.
[0015] As a specific solution in the technical solution of the present application, the extension line of the axis of the positioning hole passes through the joint; the central axis of the positioning column coincides with the symmetry axis of the sliding block.
[0016] As a specific solution in the technical solution of the present application, the depth of the positioning hole is less than the wall thickness of the outer casing.
[0017] As a specific solution in the technical solution of the present application, the positioning column has a cylindrical structure; the sliding block has a long strip structure, and both ends of the sliding block are arc-shaped.
[0018] In a second aspect, the present application proposes a technical solution for a gas turbine, which includes a turbine inner and outer casing connection structure as described in any one of the first aspects.
[0019] Compared with the prior art, the present invention has the following advantages:
[0020] The present application not only can lock and position the outer casing and the inner casing through the arrangement of the first limiting ring, the second limiting ring, the positioning column and the sliding block, but also reserves deformation margin for the thermal deformation of the inner casing, that is, reduces the probability of the occurrence of thermal deformation inconsistency between the outer casing and the inner casing, is not likely to cause the rotor and stator in the turbine to collide and rub, and is not likely to cause the connection and positioning between the outer casing and the inner casing to fail. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a partial cross-sectional schematic diagram of a turbine in the prior art;
[0022] Figure 2 A partial cross-sectional schematic diagram of a connection structure between inner and outer casings of a turbine proposed in an embodiment of the present application;
[0023] Figure 3 A three-dimensional schematic diagram of the connection between a sliding block and a sliding groove proposed in an embodiment of the present application;
[0024] Figure 4 A partial cross-sectional schematic diagram of another turbine inner and outer casing connection structure proposed in an embodiment of the present application;
[0025] Figure 5 for Figure 4 An enlarged schematic diagram of part A;
[0026] Figure 6 for Figure 4 Another enlarged schematic diagram of part A;
[0027] Figure 7 A three-dimensional schematic diagram of a positioning column and a sliding block proposed in an embodiment of the present application;
[0028] Figure 8 This is a three-dimensional schematic diagram of another positioning column and sliding block proposed in an embodiment of the present application.
[0029] In the figure: 1. Outer casing; 11. Positioning hole; 111. Axis center line; 12. First limiting ring; 13. Second limiting ring; 14. First annular casing; 15. Second annular casing; 2. Inner casing; 21. Sliding groove; 22. First casing; 23. Second casing; 24. Joint; 3. Fastening bolt; 4. Positioning column; 5. Sliding block; 6. Positioning pin. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0031] It should be noted that, in the description of this application, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on this application.
[0032] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.
[0033] It should be noted that like numbers and letters represent similar items in the following figures, so once an item is defined or described in one figure, it will not need to be further discussed and described in detail in the description of the subsequent figures.
[0034] Before understanding the embodiments of the present application, it should be clear that Figure 1 As shown, in the prior art, the outer casing 1 and the inner casing 2 are fastened and positioned by fastening bolts 3. That is, under the restrictive effect of the fastening bolts 3, if the outer casing 1 and the inner casing 2 have inconsistent dimensions, thermal expansion parameters, or ambient temperatures, they will cause thermal deformation of the outer casing 1 and the inner casing 2 to be inconsistent. If thermal deformation is inconsistent, it is easy to cause irregular deformation of the inner casing 2 or excessive stress in the fastening bolts 3, leading to failure. If the inner casing 2 is irregularly deformed, it is easy to cause the rotor and stator in the turbine to collide and rub; if the fastening bolts 3 fail, the connection and positioning between the outer casing and the inner casing will definitely fail, which means that the turbine will fail.
[0035] It should be noted that the inner casing 2 generally experiences thermal deformation in three directions: radially, axially, and circumferentially. Radial thermal deformation of the inner casing 2 refers to expansion or contraction of the inner casing 2 in its radial direction; axial thermal deformation of the inner casing 2 refers to expansion or contraction of the inner casing 2 in its axial direction; and circumferential thermal deformation of the inner casing 2 refers to relative rotation of the inner casing 2 about its central axis relative to the outer casing 1.
[0036] In order to solve the technical problem raised in the background art that the outer casing and the inner casing connected by bolts are prone to thermal deformation and incoordination in high-temperature application scenarios, the present application proposes a turbine inner and outer casing connection structure, which includes an outer casing 1, an inner casing 2, a first limiting ring 12, a second limiting ring 13, a positioning column 4 and a sliding block 5. Figure 2 As shown, the inner wall of the outer casing 1 is provided with a positioning hole 11, and the outer wall of the inner casing 2 is provided with a sliding groove 21. A first retaining ring 12 and a second retaining ring 13 are both provided on the inner wall of the outer casing 1. During use, a clearance fit is formed between the inner casing 2 and the first and second retaining rings 12, 13. A positioning post 4 forms a clearance fit with the positioning hole 11. A sliding block 5 is provided at one end of the positioning post 4 and forms a clearance fit with the sliding groove 21.
[0037] It should be clear that in the present application, clearance fit refers to the formation of a reserved gap between two components (for example, the positioning column 4 and the positioning hole 11, the sliding block 5 and the sliding groove 21, the inner casing 2 and the first limiting ring 12, and the inner casing 2 and the second limiting ring 13 mentioned above). The purpose of the reserved gap is to ensure that the inner casing 2 has a certain deformation margin when thermal deformation occurs, thereby avoiding the occurrence of uncoordinated thermal deformation of the outer casing 1 and the inner casing 2.
[0038] It is easy to understand that if Figure 2As shown, the arrangement of the first limiting ring 12, the second limiting ring 13, the positioning post 4, and the sliding block 5 can restrict the position of the inner casing 2 in the radial, axial, and circumferential directions. In other words, the arrangement of the first limiting ring 12, the second limiting ring 13, the positioning post 4, and the sliding block 5 can achieve the function of locking and positioning the outer casing 1 and the inner casing 2. It should be noted that due to the clearance fit between the inner casing 2 and the first limiting ring 12 and the second limiting ring 13, the inner casing 2 has a certain deformation margin along its axial direction, which means that the inner casing 2 can undergo thermal deformation along its axial direction. Due to the clearance fit between the positioning post 4 and the positioning hole 11, and the clearance fit between the sliding block 5 and the sliding groove 21, there is a certain deformation margin along its radial and circumferential directions, which means that the inner casing 2 can undergo thermal deformation along its radial and circumferential directions. In other words, in the present application, the inner casing 2 can undergo a certain amount of thermal deformation in all directions. If the inner casing 2 can produce a certain amount of thermal deformation in all directions, the phenomenon of thermal deformation disharmony between the outer casing 1 and the inner casing 2 is unlikely to occur. In other words, the embodiment of the turbine inner and outer casing connection structure proposed in this application, through the provision of the first limiting ring, the second limiting ring, the positioning column, and the sliding block, not only can lock and position the outer casing and the inner casing, but also reserve deformation margin for thermal deformation of the inner casing, thereby reducing the probability of thermal deformation disharmony between the outer casing and the inner casing, and is unlikely to cause friction between the rotor and the stator in the turbine, and is also unlikely to cause failure of the connection and positioning between the outer casing and the inner casing.
[0039] In the embodiments of the present application, the inner casing 2 may be a one-piece circular ring structure, or may be a circular ring structure formed by splicing together multiple arc segments. It should be noted that, compared to an inner casing 2 having a one-piece circular ring structure, an inner casing 2 formed by splicing together multiple arc segments will form multiple connecting seams, which help to reduce the phenomenon of thermal deformation disharmony between the outer casing 1 and the inner casing 2.
[0040] It should be noted that in the prior art, most light gas turbines are aeroderivative engines, and the inner casing 2 in an aeroderivative engine is generally an integrated annular structure. In order to facilitate the installation and removal of the inner casing 2 in such a gas turbine, in one embodiment of the present application, Figure 4 As shown, the outer casing 1 includes a first annular casing 14 and a second annular casing 15. The first annular casing 14 and the second annular casing 15 are detachably connected. The first limiting ring 12 is provided on the first annular casing 14; the second limiting ring 13 is provided on the second annular casing 15.
[0041] During use, if the turbine needs to be assembled, first place the second annular casing 15 vertically (that is, the central axis of the second annular casing 15 is parallel to the vertical direction); further, stack the inner casing 2 on top of the second limiting ring 13; further, insert the positioning column 4 into the positioning hole 11, and then splice the first annular casing 14 and the second annular casing 15. During the splicing process, the sliding block 5 can slide into the sliding groove 21, so that the outer casing 1 and the inner casing 2 can be positioned; finally, connect the first annular casing 14 and the second annular casing 15 so that the outer casing 1 and the inner casing 2 can be locked. The disassembly steps of the turbine are opposite to the assembly steps and are not described here.
[0042] In the embodiment of the present application, the positioning hole 11 can be provided in the second annular casing 15 or in the first annular casing 14 .
[0043] In the embodiment of the present application, the first annular casing 14 and the second annular casing 15 can be detachably connected in any reasonable manner. For example, the first annular casing 14 and the second annular casing 15 can be riveted, or Figure 4 As shown, a first flange is provided on the outer wall of the first annular casing 14, and a second flange is provided on the outer wall of the second annular casing 15. The first annular casing 14 and the second annular casing 15 are detachably connected by threads through the first flange and the second flange.
[0044] In order to facilitate the splicing and positioning of the first annular casing 14 and the second annular casing 15, and to avoid the parts in the first annular casing 14 and the second annular casing 15 from being damaged by collision due to inaccurate positioning when the first annular casing 14 and the second annular casing 15 are spliced and positioned, in one embodiment of the present application, the turbine inner and outer casing connection structure also includes a positioning pin 6. A first groove is provided at one end of the first annular casing 14 facing the second annular casing 15, and a second groove corresponding to the first groove is provided at one end of the second annular casing 15 facing the first annular casing 14. The first groove and the second groove are spliced together to form a positioning cavity, and the positioning cavity is adapted to the positioning pin 6. It should be understood that the adaptation of the positioning cavity to the positioning pin 6 means that after the positioning pin 6 is inserted into the positioning cavity, no axial or radial shaking will occur.
[0045] During use, first insert the positioning pin 6 into the second groove. When splicing the first annular casing 14 and the second annular casing 15, align the first groove on the first annular casing 14 with the positioning pin 6, so that the various components in the first annular casing 14 and the second annular casing 15 can be accurately positioned and spliced, thereby avoiding the occurrence of collision and damage of the parts in the first annular casing 14 and the second annular casing 15 due to inaccurate positioning.
[0046] In an embodiment of the present application, in order to stably lock the outer casing 1 and the inner casing 2 in the circumferential direction, multiple pairs of positioning posts 4 and sliding blocks 5 can be set along the circumference of the outer casing 1. It is easy to understand that the more pairs of positioning posts 4 and sliding blocks 5 there are, the more stable the locking and positioning of the outer casing 1 and the inner casing 2 will be. It should be noted that the more pairs of positioning posts 4 and sliding blocks 5 there are, the more corresponding positioning holes 11 and sliding slots 21 there will be. The more positioning holes 11 there are, the worse the overall strength of the outer casing 1 will be; the more sliding slots 21 there are, the worse the overall strength of the inner casing 2 will be. In order to ensure the stability of the locking and positioning of the outer casing 1 and the inner casing 2, in one embodiment of the present application, the number of pairs of positioning posts 4 and sliding blocks 5 can be greater than or equal to 4 pairs and less than or equal to 16 pairs.
[0047] It should be noted that a general turbine includes a multi-stage turbine outer ring, and correspondingly, each stage of the turbine outer ring needs to correspond to a casing, so that each stage of the turbine outer ring can be connected to the outer casing 1. In other words, the inner casing 2 can also include a multi-stage casing, and the multi-stage casing is generally a split structure. In order to enable the positioning column 4 and the sliding block 5 to simultaneously position and lock the two-stage casing (that is, the first casing 22 and the second casing 23 below), in one embodiment of the present application, the inner casing 2 may include adjacent first casings 22 and second casings 23. Among them, as Figure 5 As shown, a joint seam 24 is formed between the first casing 22 and the second casing 23, and the sliding block 5 spans the joint seam 24. Since the sliding block 5 spans the joint seam 24, the sliding block 5 can lock and position the first casing 22 and the second casing 23.
[0048] It should be clear that during use, thermal deformation of the first casing 22 will apply a deformation force to the sliding block 5, and thermal deformation of the second casing 23 will also apply a deformation force to the sliding block 5. If the directions of the two deformation forces are opposite, and the sliding block 5 is not symmetrically arranged between the first casing 22 and the second casing 23, it is easy for the sliding block 5 to be deformed due to excessive torque. In order to avoid deformation of the sliding block 5 due to excessive torque, in one embodiment of the present application, the extension line of the axis 111 of the positioning hole 11 passes through the joint 24. The central axis of the positioning column 4 coincides with the axis of symmetry of the sliding block 5. That is to say, in the embodiment of the present application, half of the sliding block 5 is located in the sliding groove 21 of the first casing 22, and the other half of the sliding block 5 is located in the sliding groove 21 of the first casing 22. This can effectively avoid excessive torque of the sliding block 5 to prevent the sliding block 5 from deforming.
[0049] In the embodiment of the present application, there is no limitation on the shape and structure of the positioning post 4. For example, the positioning post 4 may be Figure 7 The square column shown can also be Figure 8In the embodiment of the present application, there is no limitation on the shape and structure of the sliding block 5. For example, the sliding block 5 may be as follows: Figure 7 The square strip shown can also be Figure 8 As shown in the figure, the two ends of the strip are arc-shaped. Figure 3 As shown, if both ends of the sliding block 5 are in an arc shape, it is convenient for the operator to slide the sliding block 5 into the sliding groove 21 along the arc-shaped head during use.
[0050] As can be seen from the background technology, in the application scenario of gas turbine, high temperature gas is used to drive the turbine to rotate so that the turbine can do external work. Figure 1 The fastening bolts 3 shown connecting the outer casing 1 and the inner casing 2 must be provided with through-holes in the outer casing 1 for the fastening bolts 3 to pass through. It is readily understood that if the through-holes are present in the outer casing 1, some of the high-temperature combustion gas within the turbine will inevitably escape through the through-holes during long-term use. This overflowing high-temperature combustion gas could, at best, affect the turbine's energy efficiency, or, at worst, increase the temperature of the outer casing 1, thereby reducing the service life of the outer casing 1.
[0051] In order to reduce the overflow of high temperature gas in the turbine, in one embodiment of the present application, as Figure 6 As shown, the depth of the positioning hole 11 (ie Figure 6 The depth h) shown can be less than the wall thickness of the outer casing 1 (ie, Figure 6 It is easy to understand that if the depth of the positioning hole 11 is less than the wall thickness of the outer casing 1, that is, the positioning hole 11 does not penetrate the outer casing 1, then the high-temperature combustion gas inside the turbine will not overflow from the positioning hole 11, which can improve the energy utilization efficiency of the turbine and also extend the service life of the outer casing 1.
[0052] It should be clear that the embodiment of the connection structure between the inner and outer casings of the turbine proposed in the present application, through the arrangement of the first limiting ring, the second limiting ring, the positioning column and the sliding block, can not only lock and position the outer casing and the inner casing, but also reserve deformation margin for the thermal deformation of the inner casing, that is, reduce the probability of the occurrence of thermal deformation inconsistency between the outer casing and the inner casing, and is not likely to cause the rotor and stator in the turbine to collide and rub, nor is it likely to cause the connection and positioning between the outer casing and the inner casing to fail.
[0053] After introducing the turbine inner and outer casing connection structure proposed in the embodiments of the present application, the embodiment of the gas turbine proposed in the present application is introduced below. Specifically, the gas turbine includes the turbine inner and outer casing connection structure proposed in any one of the above embodiments.
[0054] It should be clear that in the embodiment of the gas turbine proposed in the present application, the internal turbine can not only lock and position the outer casing and the inner casing through the arrangement of the first limit ring, the second limit ring, the positioning column and the sliding block, but also reserve deformation margin for the thermal deformation of the inner casing, that is, reduce the probability of the occurrence of thermal deformation inconsistency between the outer casing and the inner casing, and is not likely to cause the rotor and stator in the turbine to collide and rub, nor is it likely to cause the connection and positioning between the outer casing and the inner casing to fail.
[0055] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A turbine inner and outer casing connection structure, characterized in that: include: An outer casing (1) and an inner casing (2); the inner wall of the outer casing (1) is provided with a positioning hole (11); the outer wall of the inner casing (2) is provided with a sliding groove (21); A first limiting ring (12) and a second limiting ring (13); the first limiting ring (12) and the second limiting ring (13) are both arranged on the inner wall of the outer casing (1); a clearance fit is formed between the inner casing (2) and the first limiting ring (12) and the second limiting ring (13); A positioning column (4); the positioning column (4) and the positioning hole (11) form a clearance fit; A sliding block (5) is arranged at one end of the positioning column (4); the sliding block (5) and the sliding groove (21) form a clearance fit.
2. The turbine inner and outer casing connection structure according to claim 1, characterized in that: The inner casing (2) is an integrated circular ring structure.
3. The turbine inner and outer casing connection structure according to claim 2, characterized in that: The outer casing (1) includes a first annular casing (14) and a second annular casing (15); the first annular casing (14) and the second annular casing (15) are detachably connected; the first limiting ring (12) is arranged on the first annular casing (14); and the second limiting ring (13) is arranged on the second annular casing (15).
4. The turbine inner and outer casing connection structure according to claim 3, characterized in that: The outer wall of the first annular casing (14) is provided with a first flange; the outer wall of the second annular casing (15) is provided with a second flange; the first annular casing (14) and the second annular casing (15) are detachably connected by threads through the first flange and the second flange.
5. The turbine inner and outer casing connection structure according to claim 4, characterized in that: The turbine further comprises a positioning pin (6); a first groove is provided on one end of the first annular casing (14) facing the second annular casing (15); a second groove corresponding to the first groove is provided on one end of the second annular casing (15) facing the first annular casing (14); the first groove and the second groove are spliced to form a positioning cavity; the positioning cavity is adapted to the positioning pin (6).
6. The turbine inner and outer casing connection structure according to any one of claims 1 to 5, characterized in that: The inner casing (2) comprises a first casing (22) and a second casing (23) adjacent to each other; a joint seam (24) is formed between the first casing (22) and the second casing (23); and the sliding block (5) spans the joint seam (24).
7. The turbine inner and outer casing connection structure according to claim 6, characterized in that: The extension line of the axis line (111) of the positioning hole (11) passes through the joint seam (24); the central axis of the positioning column (4) coincides with the symmetry axis of the sliding block (5).
8. The turbine inner and outer casing connection structure according to any one of claims 1 to 5, characterized in that: The depth of the positioning hole (11) is less than the wall thickness of the outer casing (1).
9. The turbine inner and outer casing connection structure according to any one of claims 1 to 5, characterized in that: The positioning column (4) is in a cylindrical structure; the sliding block (5) is in a long strip structure, and both ends of the sliding block (5) are in an arc shape.
10. A gas turbine, characterized in that: The invention comprises a turbine inner and outer casing connection structure as claimed in any one of claims 1 to 9.