Internal heat preservation positioning and fastening mechanism for metal expansion joint of gas turbine exhaust diffusion section

Abstract

The utility model relates to the technical field of gas turbine exhaust heat preservation, and particularly discloses a gas turbine exhaust diffusion section metal expansion joint inner heat preservation positioning and fastening mechanism which comprises a heat preservation outer ring, a heat preservation inner ring arranged on the outer side of the heat preservation outer ring in a sleeved mode, a gap between the heat preservation inner ring and the heat preservation outer ring and a plurality of sets of supporting pieces arranged in the gap. The supporting pieces are evenly distributed in the circumferential direction of the axis of the heat preservation inner ring, the supporting pieces comprise screw fixing sets and pressing plate supporting sets, and nut structures used for fastening the pressing plate supporting sets are arranged on the screw fixing sets. The pressing plate supporting set is firmly fixed between the heat preservation outer ring and the heat preservation inner ring through the screw fixing set, and the pressing plate supporting set can disperse stress borne by the heat preservation outer ring and the heat preservation inner ring. The pressing plate supporting set can prevent the thermal insulation outer ring and the thermal insulation inner ring from being distorted, sunken and other deformation conditions due to thermal expansion and cold contraction or uneven stress, and it is ensured that the expansion joint keeps good shape and size precision.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine exhaust insulation technology, and in particular to an internal insulation positioning and fastening mechanism for a metal expansion joint in the exhaust diffuser section of a gas turbine. Background Technology

[0002] Gas turbines generate a large amount of high-temperature exhaust gas during operation. Exhaust diffuser expansion joints are used to compensate for the displacement of exhaust pipes caused by thermal expansion and contraction, while also reducing exhaust noise. Internal insulation fixing and fastening technology ensures that the insulation material does not fall off or shift under harsh operating conditions such as high temperature and vibration, thereby effectively reducing heat loss, improving energy utilization efficiency, and protecting the safety of surrounding equipment and personnel.

[0003] The metal expansion joint has an outer insulating ring, and a rod support is installed between the outer insulating ring and the inner ring. The rod support is fixed to the inner and outer rings by welding. Since the rod support is mostly welded to the inner and outer rings at point-to-point, when the exhaust pipe deforms due to thermal expansion and contraction, the local area where the inner and outer rings are connected to the support will be subjected to greater pressure. The point-to-point welding connection will cause stress to concentrate at the connection point. During thermal expansion and contraction, these stress concentration points may become the starting point of pipe deformation or the source of crack propagation, which needs to be improved. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes an internal insulation, positioning, and fastening mechanism for the metal expansion joint of the exhaust diffuser section of a gas turbine. This mechanism solves the problem that the support components of the current insulation, positioning, and fastening mechanism are connected by point-to-point welding, which leads to stress concentration at the connection points. During thermal expansion and contraction, these stress concentration points can cause pipe deformation or cracks.

[0005] To achieve the purpose of this utility model, the utility model is achieved through the following technical solution: a heat insulation positioning and fastening mechanism for the metal expansion joint of the exhaust diffuser section of a gas turbine, including a heat insulation outer ring, a heat insulation inner ring sleeved on the outside of the heat insulation outer ring, and a gap between the heat insulation inner ring and the heat insulation outer ring;

[0006] Also includes:

[0007] Multiple sets of support members are set within the interval, with at least one set of support members, and each set of support members is evenly arranged in the circumferential direction of the inner ring axis of the insulation.

[0008] The support includes a screw fixing assembly and a pressure plate support assembly. The screw fixing assembly is provided with a nut structure for fastening the pressure plate support assembly.

[0009] The screw fixing assembly includes screw A, screw B and screw C. One end of screw A is welded and fixed to the inner insulation ring, and the other end of screw A is welded and fixed to the outer insulation ring. The pressure plate support assembly includes a first pressure plate, a second pressure plate and a third pressure plate. The third pressure plate is placed between the first pressure plate and the second pressure plate.

[0010] A further improvement is that the screw A includes a first bolt body, the upper end of which is provided with a first connecting post, the first connecting post being fixedly connected to the first bolt body, and the radius of the first connecting post being smaller than the radius of the first bolt body.

[0011] A further improvement is that the screw B includes a second bolt body, a second connecting post at the upper end of the second bolt body, a third connecting post at the upper end of the second connecting post, the second connecting post and the third connecting post being fixedly connected to the second bolt body, and the radii of the second bolt body, the second connecting post and the third connecting post decreasing sequentially.

[0012] A further improvement is that the screw C includes a third bolt body, a fourth connecting post at the upper end of the first bolt body, a fifth connecting post at the upper end of the fourth connecting post, and a sixth connecting post at the upper end of the fifth connecting post. The fourth connecting post is fixedly connected to the third bolt body and the fifth connecting post, and the sixth connecting post is fixedly connected to the fifth connecting post. The radii of the third bolt body, the fourth connecting post, the fifth connecting post, and the sixth connecting post decrease sequentially.

[0013] A further improvement is that the first pressure strip plate includes a first connecting section and a second connecting section, with an angle A formed between the second connecting section and the first connecting section, and a first bolt hole that mates with the first connecting post, the third connecting post and the sixth connecting post is provided on the second connecting section and the first connecting section.

[0014] A further improvement is that the second pressure strip plate includes a third connecting section, a fourth connecting section and a fifth connecting section, a horizontal connecting part is formed between the third connecting section and the fourth connecting section, an angle B is formed between the fourth connecting section and the fifth connecting section, and a second bolt hole is provided on the third connecting section, the fourth connecting section and the fifth connecting section to cooperate with the first connecting post, the second connecting post and the fourth connecting post.

[0015] A further improvement is that the third pressure strip plate includes a sixth connecting segment and a seventh connecting segment, with a bend C formed between the sixth connecting segment and the seventh connecting segment, and a third bolt hole that mates with the third connecting post and the fifth connecting post is provided on the sixth connecting segment and the seventh connecting segment.

[0016] A further improvement is that the nut structure includes a nut sleeved on the outside of the first connecting post, the second connecting post, the third connecting post, the fourth connecting post, the fifth connecting post, and the sixth connecting post, with a washer provided on one side of the nut.

[0017] A further improvement is that the outer side of the heat-insulating inner ring is provided with multiple through holes that cooperate with the first connecting post, the third connecting post and the sixth connecting post.

[0018] A further improvement is that the inner side of the heat-insulating outer ring is provided with multiple reserved holes that cooperate with the first, second, and third plugs.

[0019] A further improvement is that the outer insulation ring, inner insulation ring, screw fixing group, and pressure plate support group are made of heat-resistant stainless steel.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] The pressure plate support assembly is firmly fixed between the outer and inner insulation rings by screw fixing. The pressure plate support assembly can distribute the stress on the outer and inner insulation rings. In addition, when the outer and inner insulation rings are subjected to temperature changes, the pressure plate support assembly can prevent the outer and inner insulation rings from deforming or denting due to thermal expansion and contraction or uneven stress, ensuring that the expansion joint maintains good shape and dimensional accuracy. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of the heat-insulating inner ring in this utility model.

[0024] Figure 2 This is a structural diagram of screws A, B, and C in this utility model.

[0025] Figure 3 This is a structural diagram of the first pressure strip, the second pressure strip, and the third pressure strip in this utility model.

[0026] Figure 4 This is a structural diagram of the first bolt hole, the second bolt hole, and the third bolt hole in this utility model.

[0027] Figure 5 This is a structural diagram of the heat-insulating outer ring in this utility model.

[0028] Among them: 1. Insulation outer ring; 2. Insulation inner ring;

[0029] 3. Screw fixing assembly; 31. Screw A; 311. First bolt body; 312. First connecting post; 32. Screw B; 321. Second bolt body; 322. Second connecting post; 323. Third connecting post; 33. Screw C; 331. Third bolt body; 332. Fourth connecting post; 333. Fifth connecting post; 334. Sixth connecting post;

[0030] 4. Pressure plate support assembly; 41. First pressure strip plate; 411. First connecting section; 412. Second connecting section; 413. First bolt hole; 42. Second pressure strip plate; 421. Third connecting section; 422. Fourth connecting section; 423. Fifth connecting section; 424. Second bolt hole; 43. Third pressure strip plate; 431. Sixth connecting section; 432. Seventh connecting section; 433. Third bolt hole;

[0031] 5. Through hole; 6. Reserved hole; 7. Nut. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] according to Figure 1 , 2 As shown in Figures 3, 4, and 5, this embodiment proposes an internal insulation positioning and fastening mechanism for the metal expansion joint of the exhaust diffuser section of a gas turbine, including an outer insulation ring 1, an inner insulation ring 2 sleeved on the outside of the outer insulation ring 1, and a gap between the inner insulation ring 2 and the outer insulation ring 1.

[0034] Also includes:

[0035] Multiple sets of support members are set in the interval, with at least 24 sets of support members, and each set of support members is evenly arranged in the circumferential direction of the inner ring 2 axis of the insulation.

[0036] The support is set between the outer insulation ring 1 and the inner insulation ring 2 to fix and support the outer insulation ring 1 and the inner insulation ring 2.

[0037] The support includes a screw fixing assembly and a pressure plate support assembly. The screw fixing assembly is provided with a nut structure for fastening the pressure plate support assembly.

[0038] The screw fixing assembly includes screws A31, B32 and C33. One end of screw A31 is welded and fixed to the inner insulation ring 2, and the other end of screw A31 is welded and fixed to the outer insulation ring 1. The pressure plate support assembly includes a first pressure strip plate 41, a second pressure strip plate 42 and a third pressure strip plate 43. The third pressure strip plate 43 is placed between the first pressure strip plate 41 and the second pressure strip plate 42.

[0039] The pressure plate support assembly is firmly fixed between the outer insulation ring 1 and the inner insulation ring 2 using screw fasteners. This assembly disperses the stress on the outer and inner insulation rings, significantly improving their structural strength and stability. When the outer and inner insulation rings are subjected to temperature changes, the pressure plate support assembly prevents deformation such as twisting or denting due to thermal expansion and contraction or uneven stress, ensuring the expansion joint maintains good shape and dimensional accuracy.

[0040] Specifically, screw A31 includes a first bolt body 311, with a first connecting post 312 at its upper end. The first connecting post 312 is fixedly connected to the first bolt body 311, and the radius of the first connecting post 312 is smaller than the radius of the first bolt body 311. Optionally, the length of the first bolt body 311 is 95mm and the radius is 8mm, and the length of the first connecting post 312 is 45mm and the radius is 5mm. The end of the first bolt body 311 away from the first connecting post 312 is fixed to the inner side of the outer insulation ring 1 by welding, and the side of the first connecting post 312 away from the first bolt body 311 is fixed to the inner insulation ring 2 by welding.

[0041] Specifically, screw B32 includes a second bolt body 321, with a second connecting post 322 at its upper end and a third connecting post 323 at its upper end. The second connecting post 322, the third connecting post 323, and the second bolt body 321 are fixedly connected. The radii of the second bolt body 321, the second connecting post 322, and the third connecting post 323 decrease sequentially. Optionally, the second bolt body 321 has a length of 100mm and a radius of 12mm, the second connecting post 322 has a length of 110mm and a radius that is 5mm smaller, and the third connecting post 323 has a length of 45mm and a radius that is 3mm smaller. The end of the second bolt body 321 away from the second connecting post 322 is fixed to the inner side of the outer insulation ring 1 by welding, and the side of the second connecting post 322 away from the second bolt body 321 is fixed to the inner insulation ring 2 by welding.

[0042] Specifically, screw C33 includes a third bolt body 331, a fourth connecting post 332 at the upper end of the first bolt body 311, a fifth connecting post 333 at the upper end of the fourth connecting post 332, and a sixth connecting post 334 at the upper end of the fifth connecting post 333. The fourth connecting post 332 is fixedly connected to the third bolt body 331 and the fifth connecting post 333, and the sixth connecting post 334 is fixedly connected to the fifth connecting post 333. The radii of the third bolt body 331, the fourth connecting post 332, the fifth connecting post 333, and the sixth connecting post 334 decrease sequentially. Optionally, the length of the third bolt body 331 is 88mm and the radius is 15mm; the length of the fourth connecting post 332 is 105mm and the radius is 3mm smaller; the length of the fifth connecting post 333 is 65mm and the radius is 3mm smaller; and the length of the sixth connecting post 334 is 45mm and the radius is 3mm smaller. The end of the third bolt 331 away from the fourth connecting post 332 is fixed to the inner side of the outer insulation ring 1 by welding, and the side of the sixth connecting post 334 away from the fifth connecting post 333 is fixed to the inner insulation ring 2 by welding.

[0043] It is worth noting in detail that the first pressure strip 41 includes a first connecting section 411 and a second connecting section 412. An angle A is formed between the second connecting section 412 and the first connecting section 411. First bolt holes 413 are provided on the second connecting section 412 and the first connecting section 411 to mate with the first connecting post 312, the third connecting post 323, and the sixth connecting post 334. Optionally, the angle A is 178.93°. The length of the first connecting section 411 is 55mm, and the length of the second connecting section 412 is 500mm.

[0044] The second pressure strip 42 includes a third connecting section 421, a fourth connecting section 422, and a fifth connecting section 423. A horizontal connecting portion is formed between the third connecting section 421 and the fourth connecting section 422, and an angle B is formed between the fourth connecting section 422 and the fifth connecting section 423. Second bolt holes 424 are provided on the third connecting section 421, the fourth connecting section 422, and the fifth connecting section 423 to mate with the first connecting post 312, the second connecting post 322, and the fourth connecting post 332. Optionally, the angle B is 168°. The length of the fifth connecting section 423 is 280 mm.

[0045] The third pressure strip 43 includes a sixth connecting section 431 and a seventh connecting section 432, with an angle C formed between them. The sixth connecting section 431 and the seventh connecting section 432 have third bolt holes 433 that mate with the third connecting post 323 and the fifth connecting post 333. Optionally, the angle C is 168°. The length of the seventh connecting section 432 is 280 mm.

[0046] The first pressure plate 41, the second pressure plate 42, the third pressure plate 43 and the heat insulation inner ring 2 are fastened by the nut structure. Specifically, the nut structure includes a nut 7 sleeved on the outside of the first connecting post 312, the second connecting post 322, the third connecting post 323, the fourth connecting post 332, the fifth connecting post 333 and the sixth connecting post 334, and a washer is provided on one side of the nut 7.

[0047] The first connecting post 312 passes through the first bolt hole 413 and the second bolt hole 424, the second connecting post 322 passes through the second bolt hole 424, the third connecting post 323 passes through the third bolt hole 433 and the first bolt hole 413, the fourth connecting post 332 passes through the fifth connecting section 423, the fifth connecting post 333 passes through the third bolt hole 433, and the sixth connecting post 334 passes through the first bolt hole 413. Then, the corresponding nuts 7 are tightened sequentially to secure the first pressure plate 41, the second pressure plate 42, and the third pressure plate 43. Gaskets distribute the pressure on the contact surfaces of the connecting parts, improving the tightness of the connection.

[0048] To enhance the stability of the connection between the screw fixing assembly and the inner insulation ring 2, multiple through holes 5 are provided on the outer side of the inner insulation ring 2 to mate with the first connecting post 312, the third connecting post 323, and the sixth connecting post 334. The first connecting post 312, the third connecting post 323, and the sixth connecting post 334 are inserted into the through holes 5 on the outer side of the inner insulation ring 2, passing through the inner insulation ring 2. After the connection is completed, the nut 7 is screwed onto the first connecting post 312, the third connecting post 323, and the sixth connecting post 334 from the inside of the inner insulation ring 2 to tighten the inner insulation ring 2.

[0049] To facilitate on-site location of the screw root for spot welding, in the preferred embodiment, the inner side of the insulation outer ring 1 is provided with multiple pre-drilled holes 6 that mate with the first bolt body 311, the second bolt body 321, and the third bolt body 331. During processing, the first bolt body 311, the second bolt body 321, and the third bolt body 331 can be inserted into the corresponding pre-drilled holes 6 before welding.

[0050] In the preferred embodiment, the outer insulating ring 1, the inner insulating ring 2, the screw fixing assembly 3, and the pressure plate support assembly 4 are made of heat-resistant stainless steel. This ensures that the outer insulating ring 1, the inner insulating ring 2, the screw fixing assembly 3, and the pressure plate support assembly 4 can maintain stable performance in high-temperature environments and are not easily deformed, softened, or melted due to high temperatures.

[0051] How this application works:

[0052] The pressure plate support assembly is firmly fixed between the outer insulation ring 1 and the inner insulation ring 2 using screw fasteners. This assembly disperses the stress on the outer and inner insulation rings, significantly improving their structural strength and stability. When the outer and inner insulation rings are subjected to temperature changes, the pressure plate support assembly prevents deformation such as twisting or denting due to thermal expansion and contraction or uneven stress, ensuring the expansion joint maintains good shape and dimensional accuracy.

[0053] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0054] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A thermal insulation positioning and fastening mechanism for a metal expansion joint in the exhaust diffuser section of a gas turbine, comprising an outer thermal insulation ring (1), an inner thermal insulation ring (2) sleeved on the outside of the outer thermal insulation ring (1), and a gap between the inner thermal insulation ring (2) and the outer thermal insulation ring (1), characterized in that: Multiple sets of support members are provided within the interval, the number of support members being at least 24, and each set of support members is evenly arranged in the circumferential direction of the axis of the inner insulation ring (2). The support includes a screw fixing assembly and a pressure plate support assembly, and the screw fixing assembly is provided with a nut structure for fastening the pressure plate support assembly; The screw fixing group includes screw A (31), screw B (32) and screw C (33). One end of screw A (31) is welded and fixed to the inner insulation ring (2), and the other end of screw A (31) is welded and fixed to the outer insulation ring (1). The pressure plate support group includes a first pressure strip plate (41), a second pressure strip plate (42) and a third pressure strip plate (43). The third pressure strip plate (43) is placed between the first pressure strip plate (41) and the second pressure strip plate (42).

2. The internal insulation, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 1, characterized in that: The screw A (31) includes a first bolt body (311), and a first connecting post (312) is provided at the upper end of the first bolt body (311). The first connecting post (312) is fixedly connected to the first bolt body (311), and the radius of the first connecting post (312) is smaller than the radius of the first bolt body (311).

3. The internal insulation, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 2, characterized in that: The screw B (32) includes a second bolt body (321), the upper end of which is provided with a second connecting post (322), the upper end of which is provided with a third connecting post (323), the second connecting post (322) is fixedly connected with the third connecting post (323) and the second bolt body (321), and the radii of the second bolt body (321), the second connecting post (322) and the third connecting post (323) decrease sequentially.

4. The internal insulation, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 3, characterized in that: The screw C (33) includes a third bolt body (331), a fourth connecting post (332) is provided at the upper end of the first bolt body (311), a fifth connecting post (333) is provided at the upper end of the fourth connecting post (332), and a sixth connecting post (334) is provided at the upper end of the fifth connecting post (333). The fourth connecting post (332) is fixedly connected to the third bolt body (331) and the fifth connecting post (333), and the sixth connecting post (334) is fixedly connected to the fifth connecting post (333). The radii of the third bolt body (331), the fourth connecting post (332), the fifth connecting post (333), and the sixth connecting post (334) decrease sequentially.

5. The heat-insulating, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 4, characterized in that: The first pressure strip plate (41) includes a first connecting section (411) and a second connecting section (412). An angle A is formed between the second connecting section (412) and the first connecting section (411). The second connecting section (412) and the first connecting section (411) are provided with first bolt holes (413) that cooperate with the first connecting post (312), the third connecting post (323) and the sixth connecting post (334).

6. The heat-insulating, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 4, characterized in that: The second pressure strip plate (42) includes a third connecting section (421), a fourth connecting section (422) and a fifth connecting section (423). A horizontal connecting part is formed between the third connecting section (421) and the fourth connecting section (422). An angle B is formed between the fourth connecting section (422) and the fifth connecting section (423). The third connecting section (421), the fourth connecting section (422) and the fifth connecting section (423) are provided with second bolt holes (424) that cooperate with the first connecting post (312), the second connecting post (322) and the fourth connecting post (332).

7. The heat-insulating, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 4, characterized in that: The third pressure strip plate (43) includes a sixth connecting section (431) and a seventh connecting section (432), with a bend C formed between the sixth connecting section (431) and the seventh connecting section (432), and a third bolt hole (433) is provided on the sixth connecting section (431) and the seventh connecting section (432) to cooperate with the third connecting post (323) and the fifth connecting post (333).

8. The heat-insulating, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 4, characterized in that: The nut structure includes a nut (7) sleeved on the outside of the first connecting post (312), the second connecting post (322), the third connecting post (323), the fourth connecting post (332), the fifth connecting post (333), and the sixth connecting post (334), and a washer is provided on one side of the nut (7).

9. The heat-insulating, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 4, characterized in that: The outer side of the heat-insulating inner ring (2) is provided with multiple through holes (5) that cooperate with the first connecting post (312), the third connecting post (323) and the sixth connecting post (334).

10. The heat-insulating, positioning, and fastening mechanism for the metal expansion joint of the gas turbine exhaust diffuser section according to claim 1, characterized in that: The outer insulating ring (1), the inner insulating ring (2), the screw fixing group (3), and the pressure plate support group (4) are made of heat-resistant stainless steel.

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