Flue gas damper transmission mechanism of gas turbine

Abstract

The utility model discloses a flue gas damper transmission mechanism of a gas turbine, which comprises a transmission shaft and a rocker arm connected on the transmission shaft, a torque transmission structure is arranged on the transmission shaft, a torque transmission hole matched with the torque transmission structure is arranged on the rocker arm, and the transmission shaft is connected with the rocker arm through the matching between the torque transmission structure and the torque transmission hole. The non-circular shaft and the non-circular hole are matched to replace a welding structure to realize connection of the rocker arm and the transmission shaft, and the under-effect risk of the rocker arm and transmission shaft connecting structure in a high-temperature state can be reduced, so that the connection and transmission reliability of the rocker arm and the transmission shaft is improved, and safe operation of equipment is guaranteed.

Description

Technical Field

[0001] This utility model relates to a working mechanism of a combined cycle power generation device, and more specifically, to a flue gas damper transmission mechanism of a gas turbine. Background Technology

[0002] The flue gas damper is a downstream device of the gas turbine in a combined cycle power generation system. It is typically driven by a drive shaft and rocker arm, which in turn drives a connecting rod to open and close within the gas turbine's exhaust flue, operating from 0° to 90°. In existing flue gas damper drive mechanisms, the drive shaft passes through the end of the rocker arm, and the circumferential seam between the rocker arm and the drive shaft is directly welded, thus integrating the rocker arm and drive shaft into one unit for transmission. The flow field within the flue is characterized by high-speed turbulence, with flue gas temperatures reaching 700°C. During operation, the drive unit is directly exposed to high-temperature flue gas (up to 700°C) and also experiences the impact of the flue gas, with flow rates reaching up to 3100 tons per hour and maximum transmission torque exceeding 700 kN·m, making the operating conditions extremely harsh. When a welded structure is used, the high-temperature, high-speed flue gas scouring generates alternating stress, leading to fatigue failure of the welded structure; the thermal stress caused by the difference in thermal expansion rates between the base material and the welding material also affects structural performance. With continuous technological advancements, gas turbine output power is increasing, leading to larger exhaust flow rates and higher exhaust temperatures. This increases the risks associated with welded structures between the drive shaft and rocker arm. Utility model patent CN210461753U discloses a flue gas damper transmission structure that ensures the frame and track remain undeformed during hoisting and welding; and that the insert plate effectively avoids corrosion from flue gas during use. However, this utility model does not improve the connection structure between the rocker arm and drive shaft. Utility Model Content

[0003] In existing flue gas damper transmission mechanisms for gas turbines, the rocker arm and drive shaft are connected by welding. Under the harsh operating conditions of the gas turbine exhaust flue, alternating stress and thermal stress are easily generated, affecting structural performance. To overcome this defect, this utility model provides a flue gas damper transmission mechanism for gas turbines, which improves the reliability of the connection between the rocker arm and drive shaft in downstream equipment of the gas turbine.

[0004] The technical solution of this utility model is: a flue gas damper transmission mechanism for a gas turbine, including a transmission shaft and a rocker arm connected to the transmission shaft. The transmission shaft is provided with a torque transmission structure, and the rocker arm is provided with a torque transmission hole adapted to the torque transmission structure. The transmission shaft and the rocker arm are connected through the fit between the torque transmission structure and the torque transmission hole. This utility model achieves the transmission connection between the rocker arm and the transmission shaft by replacing the welding structure with a mechanical fit structure, eliminating the welding process and avoiding the adverse effects of alternating stress and thermal stress, as well as the risk of weld cracking.

[0005] Preferably, the torque transmission structure is located on a transmission sleeve, which is fitted onto the end of the transmission shaft and welded to it. By mounting the torque transmission structure on the transmission sleeve, it becomes an integral, modular component, eliminating the need for direct machining on the transmission shaft. The transmission sleeve can be machined independently, allowing for customization of sleeve dimensions to meet different torque requirements.

[0006] Preferably, the drive shaft is equipped with a rocker arm axial positioning structure, which includes an outer limiting ring and an inner limiting ring. The outer limiting ring is located on the outside of the rocker arm, and the inner limiting ring is located on the inside of the rocker arm. The outer and inner limiting rings are located on both sides of the rocker arm, which can limit the axial displacement of the rocker arm.

[0007] Preferably, the outer limiting ring and the transmission sleeve are integrally formed.

[0008] Alternatively, the outer limit ring is welded onto the transmission sleeve.

[0009] Preferably, the torque transmission structure is a prism with a regular octagonal cross-section. The regular octagonal prism has a non-circular cross-section, which, when fitted with a torque transmission hole of a matching shape, enables a non-welded connection between the rocker arm and the drive shaft.

[0010] Alternatively, the torque transmission structure is a prism with a regular hexagonal cross-section. The regular hexagonal prism also has a non-circular cross-section, which, when fitted with a torque transmission hole of a matching shape, allows for a non-welded connection between the rocker arm and the drive shaft.

[0011] Preferably, the rocker arm has a hollow structure, including a rocker arm housing and a collar. The collar is fixed to one end of the rocker arm housing with bolts, and a connecting rod is connected to the other end of the rocker arm housing. The hollow structure reduces the weight of the rocker arm while maintaining good bending strength. At the same time, the hollow cavity can form a natural convection channel, improving the surface heat dissipation performance of the rocker arm.

[0012] Preferably, the rocker arm housing is provided with heat exchange holes. These holes enhance convective heat dissipation, reduce thermal stress, and prevent material creep caused by temperature differences.

[0013] The beneficial effects of this utility model are:

[0014] This invention reduces the risk of failure in the rocker arm and drive shaft connection structure under high-temperature conditions, thereby improving transmission reliability. It replaces the welding structure with a non-circular shaft and non-circular hole to achieve the connection between the rocker arm and drive shaft. This reduces the risk of failure in the connection structure under high-temperature conditions, thus improving the connection and transmission reliability of the rocker arm and drive shaft, and ensuring safe equipment operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0016] Figure 2 This is a schematic diagram of one structure of the rocker arm in this utility model.

[0017] Figure 3 This is a schematic diagram of one structure of the transmission sleeve in this utility model.

[0018] Figure 4 This is a schematic diagram of a possible fit between the rocker arm and the drive shaft in this utility model.

[0019] Figure 5 This is an exploded structural diagram of the rocker arm in this utility model.

[0020] Figure 6 This is a schematic diagram of a motion trajectory according to the present invention.

[0021] In the figure, 1-drive shaft, 2-rocker arm, 3-torque transmission structure, 4-torque transmission hole, 5-transmission sleeve, 6-outer limit ring, 7-inner limit ring, 8-rocker arm housing, 9-ring, 10-heat exchange hole, 11-connecting rod, 12-torque input shaft. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1:

[0024] like Figures 1 to 6 As shown, a flue gas damper transmission mechanism for a gas turbine includes a drive shaft 1, a rocker arm 2, and a connecting rod 11. One end of the rocker arm 2 is connected to the drive shaft 1, and the other end is hinged to the connecting rod 11. A drive sleeve 5 and a torque input shaft 12 are provided at each end of the drive shaft 1. The drive sleeve 5 has a cylindrical cavity, and one end of the drive sleeve 5 has a flange. The middle section of the drive sleeve 5 has a closed circumferential surface formed by eight planes connected in sequence, thus forming a regular octagonal prism-shaped torque transmission structure 3 on the drive shaft 1. The remaining circumferential surfaces of the drive sleeve 5 are cylindrical surfaces, and the torque transmission structure 3 protrudes above the remaining circumferential surfaces of the drive sleeve 5. The torque input shaft 12 also has a flange, which is fixedly connected to the flange of the drive sleeve 5. The rocker arm 2 includes a rocker arm housing 8 and a collar 9. The collar 9 is fixed to one end of the rocker arm housing 8 by bolts, and the other end of the rocker arm housing 8 is connected to one end of the connecting rod 11 via a hinge shaft. The other end of the connecting rod 11 is hinged to the flue gas damper. The rocker arm housing 8 forms a cavity, making the rocker arm 2 a hollow structure. Heat exchange holes 10 are provided on the rocker arm housing 8 to facilitate the passage of high-temperature flue gas for heat exchange, ensuring uniform heating inside and outside the rocker arm 2. The central hole of the collar 9 forms the torque transmission hole 4 at the end of the rocker arm 2. The torque transmission hole 4 is octagonal and fits into the torque transmission structure 3. The torque transmission structure 3 and the torque transmission hole 4 form a fitting, enabling the transmission connection between the drive shaft 1 and the rocker arm 2.

[0025] The transmission sleeve 5 is fitted onto the transmission shaft 1, and an annular weld groove is provided between the inner end of the transmission sleeve 5 and the torque transmission structure 3. The transmission sleeve 5 is welded to the transmission shaft 1 at the annular weld groove using an electron beam welding method. The transmission sleeve 2 is made of high-temperature alloy steel, and its inner diameter is H7 / h6 clearance fit with the outer diameter of the transmission shaft 1 to ensure that the transmission sleeve 2 can be freely fitted onto the transmission shaft 1. The transmission shaft 1 is provided with a rocker arm axial positioning structure, which includes an outer limiting ring 6 and an inner limiting ring 7. The outer limiting ring 6 is located on the outside of the rocker arm 2, and the inner limiting ring 7 is located on the inside of the rocker arm 2. An axial clearance of 0.2mm is left between the limiting rings and the rocker arm to ensure that the rocker arm 2 can still maintain its match with the rocker arm axial positioning structure after material expansion in the high-temperature environment of the gas turbine. The outer limiting ring 6 is integrally formed with the transmission sleeve 5, and the inner limiting ring 7 is integrally welded with the transmission sleeve 2 using an electron beam welding method. After welding, a 550℃ tempering treatment is performed to eliminate stress.

[0026] When the flue gas damper transmission mechanism of this gas turbine is working, the torque input shafts 12 at both ends of the transmission shaft 1 synchronously introduce torque from the outside and transmit it to the transmission sleeves 5 connected to them. The transmission sleeves 5 drive the rocker arm 2 to rotate and swing through the torque transmission structure 3, which in turn drives the connecting rod 11. The connecting rod 11 then drives the connected flue gas damper to perform a 0~90° rotation opening and closing motion.

[0027] Example 2:

[0028] A flue gas damper transmission mechanism for a gas turbine includes a drive shaft 1, a rocker arm 2, and a connecting rod 11. One end of the rocker arm 2 is connected to the drive shaft 1, and the other end is hinged to the connecting rod 11. A drive sleeve 5 and a torque input shaft 12 are provided at each end of the drive shaft 1. The drive sleeve 5 has a cylindrical cavity, and one end of the drive sleeve 5 has a flange. Unlike embodiment 1, in this embodiment, the middle section of the drive sleeve 5 has a closed circumferential surface formed by six planes connected sequentially, thereby forming a regular hexagonal prism-shaped torque transmission structure 3 on the drive shaft 1. The remaining circumferential surfaces of the drive sleeve 5 are cylindrical surfaces, and the torque transmission structure 3 protrudes above the remaining circumferential surfaces of the drive sleeve 5. The torque input shaft 12 also has a flange, which is fixedly connected to the flange of the drive sleeve 5. The rocker arm 2 includes a rocker arm housing 8 and a collar 9. The collar 9 is fixed to one end of the rocker arm housing 8 by bolts. The other end of the rocker arm housing 8 is connected to one end of a connecting rod 11 via a hinge shaft. The other end of the connecting rod 11 is hinged to a flue gas damper. The rocker arm housing 8 forms a cavity, making the rocker arm 2 a hollow structure. The rocker arm housing 8 is provided with heat exchange holes 10 to facilitate the passage of high-temperature flue gas for heat exchange, ensuring that the rocker arm 2 is heated evenly inside and out. The central hole of the collar 9 constitutes the torque transmission hole 4 at the end of the rocker arm 2. The torque transmission hole 4 is hexagonal and fits with the torque transmission structure 3. The torque transmission structure 3 and the torque transmission hole 4 form a fitting, enabling the transmission shaft 1 and the rocker arm 2 to achieve a transmission connection. The rest is the same as in Embodiment 1.

[0029] The transmission sleeve 5 is fitted onto the transmission shaft 1, and an annular weld groove is provided between the inner end of the transmission sleeve 5 and the torque transmission structure 3. The transmission sleeve 5 is welded to the transmission shaft 1 at the annular weld groove using an electron beam welding method. The transmission sleeve 2 is made of high-temperature alloy steel, and its inner diameter is H7 / h6 clearance fit with the outer diameter of the transmission shaft 1 to ensure that the transmission sleeve 2 can be freely fitted onto the transmission shaft 1. The transmission shaft 1 is provided with a rocker arm axial positioning structure, which includes an outer limiting ring 6 and an inner limiting ring 7. The outer limiting ring 6 is located on the outside of the rocker arm 2, and the inner limiting ring 7 is located on the inside of the rocker arm 2. An axial clearance of 0.2mm is left between the limiting rings and the rocker arm to ensure that the rocker arm 2 can still maintain its match with the rocker arm axial positioning structure after material expansion in the high-temperature environment of the gas turbine. The outer limiting ring 6 is integrally formed with the transmission sleeve 5, and the inner limiting ring 7 is integrally welded with the transmission sleeve 2 using an electron beam welding method. After welding, a 550℃ tempering treatment is performed to eliminate stress.

[0030] When the flue gas damper transmission mechanism of this gas turbine is working, the torque input shafts 12 at both ends of the transmission shaft 1 synchronously introduce torque from the outside and transmit it to the transmission sleeves 5 connected to them. The transmission sleeves 5 drive the rocker arm 2 to rotate and swing through the torque transmission structure 3, which in turn drives the connecting rod 11. The connecting rod 11 then drives the connected flue gas damper to perform a 0~90° rotation opening and closing motion.

[0031] Example 3:

[0032] A flue gas damper transmission mechanism for a gas turbine includes a drive shaft 1, a rocker arm 2, and a connecting rod 11. One end of the rocker arm 2 is connected to the drive shaft 1, and the other end is hinged to the connecting rod 11. A drive sleeve 5 and a torque input shaft 12 are provided at each end of the drive shaft 1. The drive sleeve 5 has a cylindrical cavity, and one end of the drive sleeve 5 has a flange. The middle section of the drive sleeve 5 has a closed circumferential surface formed by eight planes connected sequentially, thus forming a regular octagonal prism-shaped torque transmission structure 3 on the drive shaft 1. The remaining circumferential surfaces of the drive sleeve 5 are cylindrical, and the torque transmission structure 3 protrudes above the remaining circumferential surfaces of the drive sleeve 5. The torque input shaft 12 also has a flange, which is fixedly connected to the flange of the drive sleeve 5. The rocker arm 2 includes a rocker arm housing 8 and a collar 9. The collar 9 is fixed to one end of the rocker arm housing 8 by bolts, and the other end of the rocker arm housing 8 is connected to one end of the connecting rod 11 via a hinge shaft. The other end of the connecting rod 11 is hinged to the flue gas damper. The rocker arm housing 8 forms a cavity, making the rocker arm 2 a hollow structure. Heat exchange holes 10 are provided on the rocker arm housing 8 to facilitate the passage of high-temperature flue gas for heat exchange, ensuring uniform heating inside and outside the rocker arm 2. The central hole of the collar 9 forms the torque transmission hole 4 at the end of the rocker arm 2. The torque transmission hole 4 is octagonal and fits into the torque transmission structure 3. The torque transmission structure 3 and the torque transmission hole 4 form a fitting, enabling the transmission connection between the drive shaft 1 and the rocker arm 2.

[0033] The transmission sleeve 5 is fitted onto the transmission shaft 1, and an annular weld groove is provided between the inner port of the transmission sleeve 5 and the torque transmission structure 3. The transmission sleeve 5 is welded to the transmission shaft 1 at the annular weld groove using an electron beam welding method. The transmission sleeve 2 is made of high-temperature alloy steel, and its inner diameter is H7 / h6 clearance fit with the outer diameter of the transmission shaft 1 to ensure that the transmission sleeve 2 can be freely fitted onto the transmission shaft 1. The transmission shaft 1 is provided with a rocker arm axial positioning structure, which includes an outer limiting ring 6 and an inner limiting ring 7. The outer limiting ring 6 is located on the outside of the rocker arm 2, and the inner limiting ring 7 is located on the inside of the rocker arm 2. An axial clearance of 0.2mm is left between the limiting ring and the rocker arm to ensure that the rocker arm 2 can still maintain its match with the rocker arm axial positioning structure after material expansion in the high-temperature environment of the gas turbine. Unlike Embodiment 1, in this embodiment, both the outer limiting ring 6 and the inner limiting ring 7 are integrally welded to the transmission sleeve 2 using an electron beam welding method, and after welding, they are tempered at 550℃ to relieve stress. The rest is the same as in Embodiment 1.

[0034] When the flue gas damper transmission mechanism of this gas turbine is working, the torque input shafts 12 at both ends of the transmission shaft 1 synchronously introduce torque from the outside and transmit it to the transmission sleeves 5 connected to them. The transmission sleeves 5 drive the rocker arm 2 to rotate and swing through the torque transmission structure 3, which in turn drives the connecting rod 11. The connecting rod 11 then drives the connected flue gas damper to perform a 0~90° rotation opening and closing motion.

[0035] Example 4:

[0036] A flue gas damper transmission mechanism for a gas turbine includes a drive shaft 1, a rocker arm 2, and a connecting rod 11. One end of the rocker arm 2 is connected to the drive shaft 1, and the other end is hinged to the connecting rod 11. A drive sleeve 5 and a torque input shaft 12 are provided at each end of the drive shaft 1. The drive sleeve 5 has a cylindrical cavity, and one end of the drive sleeve 5 has a flange. Unlike embodiment 1, in this embodiment, the middle section of the drive sleeve 5 has a closed circumferential surface formed by two opposing planes and two opposing arc surfaces, thereby forming a cylindrical torque transmission structure 3 on the drive shaft 1. The remaining circumferential surfaces of the drive sleeve 5 are cylindrical, and the torque transmission structure 3 protrudes above the remaining circumferential surfaces of the drive sleeve 5. The torque input shaft 12 also has a flange, which is fixedly connected to the flange of the drive sleeve 5. The rocker arm 2 includes a rocker arm housing 8 and a collar 9. The collar 9 is fixed to one end of the rocker arm housing 8 by bolts. The other end of the rocker arm housing 8 is connected to one end of a connecting rod 11 via a hinge shaft. The other end of the connecting rod 11 is hinged to a flue gas damper. The rocker arm housing 8 forms a cavity, making the rocker arm 2 a hollow structure. The rocker arm housing 8 is provided with heat exchange holes 10 to facilitate the passage of high-temperature flue gas for heat exchange, ensuring that the rocker arm 2 is heated evenly inside and out. The central hole of the collar 9 constitutes the torque transmission hole 4 at the end of the rocker arm 2. The torque transmission hole 4 is octagonal and is adapted to the torque transmission structure 3. The torque transmission structure 3 and the torque transmission hole 4 form a fitting fit, enabling the transmission shaft 1 and the rocker arm 2 to achieve a transmission connection.

[0037] The transmission sleeve 5 is fitted onto the transmission shaft 1, and an annular weld groove is provided between the inner end of the transmission sleeve 5 and the torque transmission structure 3. The transmission sleeve 5 is welded to the transmission shaft 1 at the annular weld groove using an electron beam welding method. The transmission sleeve 2 is made of high-temperature alloy steel, and its inner diameter is H7 / h6 clearance fit with the outer diameter of the transmission shaft 1 to ensure that the transmission sleeve 2 can be freely fitted onto the transmission shaft 1. The transmission shaft 1 is provided with a rocker arm axial positioning structure, which includes an outer limiting ring 6 and an inner limiting ring 7. The outer limiting ring 6 is located on the outside of the rocker arm 2, and the inner limiting ring 7 is located on the inside of the rocker arm 2. An axial clearance of 0.2mm is left between the limiting rings and the rocker arm to ensure that the rocker arm 2 can still maintain its match with the rocker arm axial positioning structure after material expansion in the high-temperature environment of the gas turbine. The outer limiting ring 6 is integrally formed with the transmission sleeve 5, and the inner limiting ring 7 is integrally welded with the transmission sleeve 2 using an electron beam welding method. After welding, a 550℃ tempering treatment is performed to relieve stress. The rest is the same as in Embodiment 1.

[0038] When the flue gas damper transmission mechanism of this gas turbine is working, the torque input shafts 12 at both ends of the transmission shaft 1 synchronously introduce torque from the outside and transmit it to the transmission sleeves 5 connected to them. The transmission sleeves 5 drive the rocker arm 2 to rotate and swing through the torque transmission structure 3, which in turn drives the connecting rod 11. The connecting rod 11 then drives the connected flue gas damper to perform a 0~90° rotation opening and closing motion.

[0039] Example 5:

[0040] A flue gas damper transmission mechanism for a gas turbine includes a drive shaft 1, a rocker arm 2, and a connecting rod 11. One end of the rocker arm 2 is connected to the drive shaft 1, and the other end is hinged to the connecting rod 11. A drive sleeve 5 and a torque input shaft 12 are provided at each end of the drive shaft 1. The drive sleeve 5 has a cylindrical cavity, and one end of the drive sleeve 5 has a flange. The middle section of the drive sleeve 5 has a closed circumferential surface formed by eight planes connected sequentially, thus forming a regular octagonal prism-shaped torque transmission structure 3 on the drive shaft 1. The remaining circumferential surfaces of the drive sleeve 5 are cylindrical, and the torque transmission structure 3 protrudes above the remaining circumferential surfaces of the drive sleeve 5. The torque input shaft 12 also has a flange, which is fixedly connected to the flange of the drive sleeve 5. The rocker arm 2 includes a rocker arm housing 8 and a collar 9. The collar 9 is fixed to one end of the rocker arm housing 8 by bolts, and the other end of the rocker arm housing 8 is connected to one end of the connecting rod 11 via a hinge shaft. The other end of the connecting rod 11 is hinged to the flue gas damper. The rocker arm housing 8 forms a cavity, making the rocker arm 2 a hollow structure. Heat exchange holes 10 are provided on the rocker arm housing 8 to facilitate the passage of high-temperature flue gas for heat exchange, ensuring uniform heating inside and outside the rocker arm 2. The central hole of the collar 9 forms the torque transmission hole 4 at the end of the rocker arm 2. The torque transmission hole 4 is octagonal and fits into the torque transmission structure 3. The torque transmission structure 3 and the torque transmission hole 4 form a fitting, enabling the transmission connection between the drive shaft 1 and the rocker arm 2.

[0041] The transmission sleeve 5 is fitted onto the transmission shaft 1, and an annular weld groove is provided between the inner port of the transmission sleeve 5 and the torque transmission structure 3. The transmission sleeve 5 is welded to the transmission shaft 1 at the annular weld groove using an electron beam welding method. The transmission sleeve 2 is made of high-temperature alloy steel, and its inner diameter is H7 / h6 clearance fit with the outer diameter of the transmission shaft 1 to ensure that the transmission sleeve 2 can be freely fitted onto the transmission shaft 1. The transmission shaft 1 is provided with a rocker arm axial positioning structure, which includes an outer limiting ring 6 and an inner limiting ring 7. The outer limiting ring 6 is located on the outside of the rocker arm 2, and the inner limiting ring 7 is located on the inside of the rocker arm 2. An axial clearance of 0.2mm is left between the limiting rings and the rocker arm to ensure that the rocker arm 2 can still maintain its match with the rocker arm axial positioning structure after material expansion in the high-temperature environment of the gas turbine. Unlike Embodiment 1, in this embodiment, both the outer limiting ring 6 and the inner limiting ring 7 are fixed to the transmission sleeve 5 with screws, and after welding, they are tempered at 550℃ to relieve stress. The rest is the same as in Embodiment 1.

[0042] When the flue gas damper transmission mechanism of this gas turbine is working, the torque input shafts 12 at both ends of the transmission shaft 1 synchronously introduce torque from the outside and transmit it to the transmission sleeves 5 connected to them. The transmission sleeves 5 drive the rocker arm 2 to rotate and swing through the torque transmission structure 3, which in turn drives the connecting rod 11. The connecting rod 11 then drives the connected flue gas damper to perform a 0~90° rotation opening and closing motion.

Claims

1. A drive mechanism for a flue gas damper door of a gas turbine, comprising a drive shaft (1) and a rocker arm (2) connected to the drive shaft (1), characterized in that The transmission shaft (1) is provided with a torque transmission structure (3), the rocker arm (2) is provided with a torque transmission hole (4) matched with the torque transmission structure (3), and the transmission shaft (1) and the rocker arm (2) are connected through the cooperation between the torque transmission structure (3) and the torque transmission hole (4).

2. The flue gas damper door drive mechanism of a gas turbine according to claim 1, characterized by, The torque transmission structure (3) is located on a transmission sleeve (5), the transmission sleeve (5) is sleeved on the end of the transmission shaft (1), and the transmission sleeve (5) is welded with the transmission shaft (1).

3. The flue gas damper door drive mechanism of a gas turbine according to claim 2, characterized in that, The transmission shaft (1) is provided with a rocker arm axial positioning structure, the rocker arm axial positioning structure comprises an outer limiting ring (6) and an inner limiting ring (7), the outer limiting ring (6) is located on the outer side of the rocker arm (2), and the inner limiting ring (7) is located on the inner side of the rocker arm (2).

4. The flue gas damper door drive mechanism of a gas turbine according to claim 3, characterized by, The outer limiting ring (6) is integrally formed with the transmission sleeve (5).

5. The flue gas baffle door drive mechanism of a gas turbine as set forth in claim 1, characterized by, The outer limiting ring (6) is welded on the transmission sleeve (5).

6. The flue gas damper door drive mechanism of a gas turbine as set forth in claim 1, characterized by, The torque transmission structure (3) is a column with a cross section in the shape of a regular octagon.

7. The flue gas baffle door drive mechanism of a gas turbine according to claim 1, characterized by, The torque transmission structure (3) is a column with a cross section in the shape of a regular hexagon.

8. The flue gas damper door drive mechanism of any one of claims 1 to 7, characterized in that, The rocker arm (2) is a hollow structure, comprising a rocker arm shell (8) and a sleeve ring (9), the sleeve ring (9) is fixed on one end of the rocker arm shell (8) through a bolt, and the other end of the rocker arm shell (8) is connected with a connecting rod.

9. The flue gas damper door drive mechanism of a gas turbine as set forth in claim 8, characterized by, The rocker arm shell (8) is provided with a heat exchange hole (10).

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