Turbine-to-turbine casing deflation structure with closed channel

Abstract

The invention provides an inter-turbine casing deflation structure with a closed channel, and belongs to the technical field of gas turbines. The power turbine case is connected with the bearing outer case; the deflation pipeline is mounted on the force-bearing outer casing; the guide blades are mounted on the outer ring; the outer ring is connected with the force-bearing outer casing and the power turbine casing, a cooling cavity is formed between the force-bearing outer casing and the outer ring, a deflation hole is formed in the front section of the outer ring, a boss structure is arranged on the outer ring, the deflation supporting ring and the deflation mounting base are fixed to the boss structure after being combined, and the mouthpiece is mounted in the deflation mounting base and the deflation pipeline to form a closed channel; the sealing ring is arranged at the front end of the outer ring, a deflation flow channel is formed between the sealing ring and the outer ring, and gas in the main flow channel flows out from the deflation pipeline along the deflation flow channel and the closed channel; the hollow support plate is arranged in the force-bearing outer casing on the front side of the deflation flow channel, and cooling holes for forming a cooling flow path are formed in the hollow support plate, the sealing ring and the outer ring.

Description

Technical Field

[0001] The present application belongs to the technical field of gas turbines, and in particular relates to an inter-turbine casing bleed structure with a closed channel. Background Art

[0002] The inter-turbine casing serves as a supporting casing for the rear fulcrum of the gas turbine and the front fulcrum of the power turbine. Compared with the traditional structure in which the gas turbine is supported on the power turbine rotor, being supported on the inter-turbine casing can avoid rotor vibration coupling to a certain extent, improve the vibration of the whole machine, and at the same time meet the impact resistance requirements of the whole machine. The power turbine guide is arranged on the inter-turbine casing, and a load rejection bleed regulating system is arranged at the same time. The flow path of the bleed regulating system is discharged from the gas channel to the front end of the guide 11, flows along the outer ring 12 of the inter-turbine casing and the sealing ring 13, and is finally discharged from the bleed port 14 of the inter-turbine casing. Figure 1 shown.

[0003] Since the inter-turbine casing is located between the gas turbine and the power turbine, the gas turbine is at a relatively high temperature when operating, and the temperature of the gas discharged from the bleed regulating system is high, resulting in high temperatures in the load-bearing outer casing 15 and the power turbine casing 16 adjacent to the bleed port 14, affecting the service life of the turbine components. Summary of the invention

[0004] The purpose of the present application is to provide an inter-turbine casing bleed structure with a closed passage to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of the present application is: a turbine inter-casing venting structure with a closed channel, comprising: a load-bearing outer casing, a venting pipeline, a power turbine casing, a hollow support plate, a sealing ring, a venting support ring, a venting mounting seat, a nozzle, an outer ring and guide vanes;

[0006] The exhaust pipe is installed on the load-bearing outer casing;

[0007] The load-bearing outer casing is connected to the power turbine casing and fixedly connected to the outer ring, and a cooling cavity is formed between the load-bearing outer casing and the outer ring;

[0008] The guide blades are mounted on the outer ring;

[0009] The front section of the outer ring is provided with a venting hole, the outer ring is provided with a boss structure, the venting support ring is combined with the venting mounting seat and fixed at the boss structure, and the nozzle is installed in the venting mounting seat and the venting pipeline to form a closed channel;

[0010] The sealing ring is arranged at the front end of the outer ring, and a venting passage is formed between the sealing ring and the outer ring, and the gas in the main passage flows out from the venting pipeline along the venting passage and the closed passage;

[0011] The hollow support plate is arranged in the load-bearing outer casing on the front side of the exhaust air duct. The hollow support plate, the sealing ring and the outer ring are provided with cooling holes forming a cooling flow path. Cooling gas is drawn from the compressor into the cavity of the hollow support plate. The cold gas cools the load-bearing outer casing, the outer ring and the power turbine casing through the cooling flow path.

[0012] In an optional embodiment of the present application, the outer ring is clamped between the load-bearing outer casing and the power turbine casing, and the load-bearing outer casing, the power turbine casing and the outer ring are fixedly connected by a same connecting piece.

[0013] In an optional embodiment of the present application, the inner front and rear ends of the outer ring are provided with a front hanging point and a rear hanging point extending backward, and the upper edge plate of the guide blade is provided with a front hook and a rear hook at the front and rear ends respectively, and the upper edge plate of the guide blade utilizes the outer surface of the front hook and the inner surface of the rear hook to center with the front hanging point and the rear hanging point of the outer ring.

[0014] In an optional embodiment of the present application, the front section of the outer ring is provided with a plurality of vent holes for discharging the main channel gas, and the plurality of vent holes are evenly distributed in the circumferential direction.

[0015] In an optional implementation manner of the present application, the air venting support ring and the air venting mounting seat are welded to form an integral structure, and are fixed to the boss structure of the outer ring by welding.

[0016] In an optional implementation manner of the present application, the cooling holes on the hollow support plate are located at the rear end of the hollow support plate.

[0017] In an optional embodiment of the present application, the cooling holes on the sealing ring are located at the upper end of the sealing ring between the load-bearing outer casing and the outer ring.

[0018] In an optional embodiment of the present application, the cooling holes on the outer ring are located at the lower side of the clamping surface between the load-bearing outer casing and the power turbine casing.

[0019] The inter-turbine casing venting structure with a closed channel provided in the present application can realize cooling of the load-bearing outer casing and the power turbine casing, can effectively reduce the temperature of the rear end of the load-bearing outer casing and the front end of the power turbine casing, and can effectively improve the service life of the turbine structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0021] Figure 1 It is a schematic diagram of the flow path of the deflation regulation system in the prior art.

[0022] Figure 2This is a schematic diagram of the turbine inter-casing bleed structure of the present application.

[0023] Figure 3 Based on Figure 2 AA direction schematic diagram.

[0024] Figure 4 This is a schematic diagram of the main flow path of the gas in the turbine casing bleed structure of the present application.

[0025] Figure 5 Based on Figure 2 An enlarged schematic diagram of point I.

[0026] Figure 6 Based on Figure 2 Enlarged schematic diagram of point II.

[0027] Figure 7 It is a schematic diagram of the cooling air flow path of the inter-turbine casing bleed structure of the present application.

[0028] Reference numerals:

[0029] 20-Turbine inter-casing venting structure

[0030] 21-Load-bearing outer casing

[0031] 22-Bleeding pipe

[0032] 23-Power turbine casing

[0033] 24-hollow support plate, 241-first cooling hole

[0034] 25-sealing ring, 251-second cooling hole

[0035] 26-Deflation support ring

[0036] 27-air vent mount, 271-through hole

[0037] 28- Mouthpiece

[0038] 29-outer ring, 291-boss structure, 292-third cooling hole, 293-third vent hole

[0039] 30-Guide blades DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0041] The present application provides a turbine inter-casing venting structure with a closed channel. On the basis of meeting the traditional venting function requirements, a closed channel is formed by a welded venting seat and a nozzle structure, thereby reducing the contact area between the main flow channel combustion gas and the load-bearing outer casing, reducing the temperature rise rate of the load-bearing outer casing, and taking cooling measures at the same time to cool the air outlet, thereby reducing the operating temperature of the load-bearing outer casing and the power turbine casing, extending the service life of the load-bearing outer casing and the power turbine casing, and meeting the long-life use requirements of the gas turbine turbine casing.

[0042] like Figures 2 to 6 As shown, the turbine inter-casing bleed structure 20 with a closed channel provided in the present application mainly includes: a load-bearing outer casing 21, a bleed pipeline 22, a power turbine casing 23, a hollow support plate 24, a sealing ring 25, a bleed support ring 26, a bleed mounting seat 27, a nozzle 28, an outer ring 29 and a guide vane 30.

[0043] The load-bearing outer casing 21 is provided with an air vent, and an air vent pipe 22 is installed at the air vent. The rear side of the load-bearing outer casing 21 is fixedly connected to the power turbine casing 23 through a connecting piece, and an outer ring 29 is clamped between the two. The three can be connected and fixed by the same bolt connecting piece.

[0044] The outer side of the outer ring 29 is provided with a boss structure 291 for fixing the deflation support ring 26. The deflation support ring 26 is assembled and fixed with the deflation mounting seat 27 and then installed on the boss structure 291 of the outer ring 29. The nozzle 28 is arranged in the deflation mounting seat 27 and the deflation pipeline 22, thereby forming a closed channel. There is a gap between the outer ring 29 and the load-bearing outer casing 21, so that a cooling cavity B can be formed.

[0045] In the present application, the bleed support ring 26 is a full-ring structure, on which circular holes are evenly arranged corresponding to the positions of the bleed holes of the load-bearing outer casing 21, and a bleed mounting seat 27 is installed at each circular hole, and the middle part of the bleed mounting seat 27 is a through hole 271 with a larger diameter, which is used for the main flow channel gas to enter the bleed pipeline 22. The bleed support ring 26 and the bleed mounting seat 27 are integrally fixed on the boss structure 291 of the outer ring 9 to form an outer ring assembly, so that the contact area between the main flow channel gas and the load-bearing outer casing 21 is changed from an annular cavity to several closed cylindrical channels, thereby reducing the heat transfer contact area between the main flow channel gas and the rear end of the load-bearing outer casing 21 and the outer ring 29, and reducing the temperature rise rate between the rear end of the load-bearing outer casing 21 and the front end of the power turbine casing 23, such as Figure 4 In some embodiments of the present application, the deflation support ring 26 and the deflation mounting seat 27 are welded to form an integral structure, and are fixed to the boss structure 291 of the outer ring 29 by welding.

[0046] The front and rear ends of the inner side of the outer ring 29 are provided with a front hanging point and a rear hanging point extending backward (backward along the airflow direction), and the upper edge plate of the guide blade 30 is provided with a front hook and a rear hook at the front and rear ends respectively. The upper edge plate of the guide blade 30 uses the outer surface of the front hook and the inner surface of the rear hook to center with the front hanging point and the rear hanging point of the outer ring 29. A plurality of venting holes 293 are provided on the front section of the outer ring 29 for exhausting the main channel. In some embodiments of the present application, the venting holes 293 are evenly distributed in the circumferential direction.

[0047] The sealing ring 25 is installed on the load-bearing outer casing 21 and is located at the front end of the outer ring 29. A load-rejecting venting flow channel is formed between the sealing ring 25 and the outer ring 29. The combustion gas from the main flow channel flows along the venting flow channel, passes through the venting hole 293 on the front section of the outer ring 29 and the through hole 271 of the venting mounting seat 27, and enters the exhaust pipe 22.

[0048] The hollow support plate 24 is arranged at the front end of the exhaust air passage, and the hollow support plate 24 has cooling air introduced from the compressor. The rear end of the hollow support plate 24 is provided with a first cooling hole 241. Figure 5 and Figure 6 As shown, the sealing ring 25 and the outer ring 29 are respectively provided with a second cooling hole 251 and a third cooling hole 292, and a cooling flow path is formed through the three cooling holes. In the present application, the second cooling hole 251 is arranged at the upper end of the sealing ring 25 between the load-bearing outer casing 21 and the outer ring 29, and the third cooling hole 292 is arranged at the lower side of the outer ring 29 at the clamping surface of the load-bearing outer casing 21 and the power turbine casing 23.

[0049] like Figure 7 As shown, the cooling air in the cavity of the hollow support plate 24 flows out through the first cooling hole 241, passes through the second cooling hole 251 of the sealing ring 25, and then enters the cooling cavity B, thereby cooling the rear section of the load-bearing outer casing 21 and the outer ring 29, and then passes through the third cooling hole 292 at the rear end of the outer ring 9 and is discharged into the main flow channel from the rear end of the upper edge plate of the guide blade 30, thereby cooling the front end of the power turbine casing 23.

[0050] The inter-turbine casing venting structure with a closed channel provided in the present application forms a cooling air flow path by arranging cooling holes on the hollow support plate, the sealing ring and the outer ring. The cooling of the rear end of the load-bearing outer casing and the front end of the power turbine casing is achieved through the cooling air flow path. The cooling air flow path is independent of the main channel exhaust, which can avoid the mixing of cold air and the main channel fuel gas, and can effectively reduce the temperature of the rear end of the load-bearing outer casing and the front end of the power turbine casing, and can effectively improve the service life of the turbine structure.

[0051] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A turbine casing venting structure with a closed channel, characterized in that: include: Load-bearing outer casing, bleed pipe, power turbine casing, hollow support plate, sealing ring, bleed support ring, bleed mounting seat, nozzle, outer ring and guide vane; The exhaust pipe is installed on the load-bearing outer casing; The load-bearing outer casing is connected to the power turbine casing and fixedly connected to the outer ring, and a cooling cavity is formed between the load-bearing outer casing and the outer ring; The guide blades are mounted on the outer ring; The front section of the outer ring is provided with a venting hole, the outer ring is provided with a boss structure, the venting support ring is combined with the venting mounting seat and fixed at the boss structure, and the nozzle is installed in the venting mounting seat and the venting pipeline to form a closed channel; The sealing ring is arranged at the front end of the outer ring, and a venting passage is formed between the sealing ring and the outer ring, and the gas in the main passage flows out from the venting pipeline along the venting passage and the closed passage; The hollow support plate is arranged in the load-bearing outer casing on the front side of the exhaust air duct. The hollow support plate, the sealing ring and the outer ring are provided with cooling holes forming a cooling flow path. Cooling gas is drawn from the compressor into the cavity of the hollow support plate. The cold gas cools the load-bearing outer casing, the outer ring and the power turbine casing through the cooling flow path.

2. The turbine casing venting structure with a closed channel according to claim 1, characterized in that: The outer ring is clamped between the load-bearing outer casing and the power turbine casing, and the load-bearing outer casing, the power turbine casing and the outer ring are fixedly connected through the same connecting piece.

3. The turbine casing venting structure with a closed channel according to claim 1, characterized in that: The inner front and rear ends of the outer ring are provided with a front hanging point and a rear hanging point extending backwards, and the upper edge plate of the guide blade is provided with a front hook and a rear hook at the front and rear ends respectively. The upper edge plate of the guide blade utilizes the outer surface of the front hook and the inner surface of the rear hook to center with the front hanging point and the rear hanging point of the outer ring.

4. The turbine casing venting structure with a closed channel according to claim 3, characterized in that: The front section of the outer ring is provided with a plurality of venting holes for discharging the main flow channel gas, and the plurality of venting holes are evenly distributed in the circumferential direction.

5. The turbine casing venting structure with a closed channel according to claim 1, characterized in that: The air release support ring and the air release mounting seat are welded to form an integral structure, and are fixed to the boss structure of the outer ring by welding.

6. The turbine casing venting structure with a closed channel according to claim 1, characterized in that: The cooling holes on the hollow support plate are located at the rear end of the hollow support plate.

7. The turbine casing bleed structure with a closed channel according to claim 1, characterized in that: The cooling hole on the sealing ring is located at the upper end of the sealing ring between the load-bearing outer casing and the outer ring.

8. The turbine casing venting structure with a closed channel according to claim 4, characterized in that: The cooling holes on the outer ring are located at the lower side of the clamping surface between the load-bearing outer casing and the power turbine casing.

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