Centering and sealing structure of casing guider between turbines

Abstract

The invention provides an inter-turbine casing guider centering and sealing structure, and belongs to the technical field of aero-engine structural design, the inter-turbine casing guider centering and sealing structure comprises a guide blade, an outer ring, an inner ring, an inner ring fixing ring, a blanking cap, a bearing inner ring casing, a cover plate, a bearing seat and an inner ring centering ring; an upper edge plate of the guide blade is in centering fit with a front hanging point and a rear hanging point of the outer ring through the outer surface of a front hook and the inner surface of a rear hook; the inner ring is centered with a radial pin shaft of the guide blade; one side of the inner ring fixing ring is fixed on the inner side of the inner ring, and the inner ring centering ring is arranged between the other side of the inner ring fixing ring and the bearing inner ring casing, so that the centering of the whole guider structure is realized; the bearing seat is mounted on the inner side of the force-bearing inner ring casing, and a blanking cap is mounted on the bearing seat; and one side of the cover plate is mounted on the inner ring centering ring through a connecting piece, and the other side of the cover plate is connected with a blanking cap on the bearing seat.

Description

Technical Field

[0001] The present application belongs to the field of aero-engine design, and in particular relates to a centering and sealing structure of a turbine casing guide. Background Art

[0002] The inter-turbine casing is located between the high-pressure turbine and the low-pressure turbine. As the supporting casing of the rear fulcrum of the high-pressure turbine and the front fulcrum of the low-pressure turbine, it is one of the supporting and main load-bearing components of the engine, and is responsible for the load-bearing and airflow rectification at the outlet of the high-pressure turbine. The low-pressure turbine guide is set at the rear side of the inter-turbine casing, which allows the mainstream gas to smoothly pass through the inter-turbine casing and flow to the front end of the low-pressure turbine, thereby reducing inter-stage leakage losses.

[0003] like Figure 1 The figure shows a schematic diagram of the installation structure 10 of the low-pressure turbine guide vane and the turbine casing in the prior art. The upper edge plate of the guide vane 11 is centered by the outer surface of the front hook and the inner surface of the rear hook in cooperation with the outer ring 12, and the inner ring 13 is centered with the radial pin of the guide vane 11. Considering the assembly requirements, the two places are matched with clearance fit. Due to the clearance design and dimensional tolerance, this positioning method may cause the guide vane 11 to have extreme deflection in the slot of the outer ring 12. When the guide vane 11 itself is deflected, with the outer ring 12 as the support point, it will drive the honeycomb eccentricity on the inner ring 13 and the inner ring fixing ring 14, so that the actual eccentricity of the three-layer honeycomb ring of the guide device exceeds the maximum eccentricity required by the design, and there is a risk of the stator and rotor getting stuck; at the same time, the turbine casing is in a high-temperature environment when working, and the temperature difference between the plug cover 15 and the load-bearing inner ring casing 16 is large, and there is an axial and radial deformation inconsistency. The cover plate 17 connected thereto is subjected to a high level of thermal stress. At the same time, the deflection of the guide vane 11 aggravates the relative deformation between the two, causing the thermal stress of the cover plate 17 to reach a higher level, and there is a risk of structural failure of the cover plate 17. Summary of the invention

[0004] The purpose of the present application is to provide a centering and sealing structure for a turbine casing guide 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 guide centering and sealing structure, comprising: a guide vane, an outer ring, an inner ring, an inner ring fixing ring, a plug cover, a load-bearing inner ring casing, a cover plate, a bearing seat and an inner ring centering ring;

[0006] The upper edge plate of the guide blade 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;

[0007] The inner ring is centered with radial pins of the guide blades;

[0008] One side of the inner ring fixing ring is fixed to the inner side of the inner ring, and an inner ring centering ring is arranged between the other side of the inner ring fixing ring and the load-bearing inner ring casing, thereby realizing the centering of the entire guide structure;

[0009] The bearing seat is installed on the inner side of the load-bearing inner ring casing, and a plug cover is installed on the bearing seat;

[0010] One side of the cover plate is mounted on the inner ring centering ring through a connecting piece, and the other side of the cover plate is connected to a plug cover on the bearing seat.

[0011] In an optional embodiment of the present application, the lower edge plate of the guide vane is provided with a rectangular boss inserted into the inner ring, and the axial positioning of the guide vane and the inner ring is achieved through the rectangular boss.

[0012] In an optional embodiment of the present application, one side of the cover plate is connected by a connecting piece passing through the inner ring fixing ring, the inner ring centering ring and the cover plate.

[0013] In an optional embodiment of the present application, the cover plate is thinner and has a larger turning angle than the existing cover plates.

[0014] In an optional implementation manner of the present application, the cover plate is made of elastic metal material.

[0015] In an optional embodiment of the present application, the inner ring centering ring is provided with an inner stopper and an outer stopper, and the inner stopper and the outer stopper are respectively interference fit with the inner ring fixing ring and the load-bearing inner ring casing.

[0016] In an optional embodiment of the present application, a honeycomb ring is provided on the inner ring and the inner ring fixing ring.

[0017] The centering sealing structure of the turbine casing guide provided in the present application improves the reliability of centering, solves the problem of excessive thermal stress of the cover plate caused by the uncoordinated deformation of the load-bearing inner ring casing and the plug cover, and is beneficial to improving the reliability of the turbine structure and the service life of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 The present invention is a schematic diagram of the installation structure of the low-pressure turbine guide vane and the inter-turbine casing in the prior art.

[0020] Figure 2 This is a schematic diagram of the centering and sealing structure of the turbine interstage casing guide of the present application.

[0021] Figure 3 This is a schematic diagram of the upper and lower installation plane gaps of the inner ring centering ring in this application.

[0022] Reference numerals:

[0023] 20-Turbine interstage casing guide centering seal structure

[0024] 21-Guide blade

[0025] 22-Outer Ring

[0026] 23-Inner Ring

[0027] 24-Inner ring fixing ring

[0028] 25-Blocking cover

[0029] 26-Load-bearing inner ring casing

[0030] 27-Cover

[0031] 28-Bearing seat

[0032] 29-Inner ring centering ring DETAILED DESCRIPTION

[0033] 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.

[0034] In order to enhance the structural stability of the inter-turbine casing guide, reduce the thermal stress of the cover plate, improve the service life of turbine components, solve the honeycomb eccentricity problem of the inner ring and the inner ring fixing ring caused by the swing problem of the guide vane, and the high thermal stress problem of the cover plate caused by the incoordination of the deformation of the plug cover and the load-bearing inner ring casing, the present application provides a centering and sealing structure for the inter-turbine casing guide.

[0035] like Figure 2 As shown, the turbine interstage casing guide centering and sealing structure 20 provided in the present application includes: guide vanes 21, an outer ring 22, an inner ring 23, an inner ring fixing ring 24, a plug cover 25, a load-bearing inner ring casing 26, a cover plate 27, a bearing seat 28 and an inner ring centering ring 29.

[0036] The outer ring 22 is fixed to the turbine casing through a connecting piece, and its inner front end and rear section 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 21 is provided with a front hook and a rear hook at the front and rear sides respectively. The upper edge plate of the guide blade 21 utilizes the outer surface of the front hook and the inner surface of the rear hook to cooperate with the front hanging point and the rear hanging point of the outer ring 22 for centering.

[0037] The inner ring 23 and the guide vane 21 are radially pin-centered. In one embodiment of the present application, a rectangular boss 211 inserted into the inner ring 23 is provided on the front side of the lower edge plate of the guide vane 21, and the axial positioning of the guide vane 21 and the inner ring 23 is achieved through the rectangular boss 211.

[0038] The outer side of the inner ring fixing ring 24 is fixed to the inner side of the inner ring 23 through a connecting piece, and an inner ring centering ring 29 is arranged between the inner side of the inner ring fixing ring 24 and the load-bearing inner ring casing 26, and its two ends are respectively assembled on the inner ring fixing ring 24 and the load-bearing inner ring casing 26 to realize the centering of the entire guide structure.

[0039] The bearing seat 28 is installed on the inner side of the load-bearing inner ring casing 26, and a plug cover 25 is installed thereon.

[0040] One side of the cover plate 27 is installed on the inner ring centering ring 29 through a connecting piece, and the other side of the cover plate 27 is connected to the plug cover 25 on the bearing seat 28. Among them, the upper side of the cover plate 27 is connected to the inner ring fixing ring 24, the inner ring centering ring 29 and the cover plate 27 through a connecting bolt. The upper cavity A of the load-bearing inner ring casing 26, the cavity B and the cavity C surrounded by the bearing seat 28 are separated by the cover plate 27. In the preferred embodiment of the present application, the cover plate 27 adopts a thinner thickness and a larger turning angle to increase its flexibility, and the bolt connection between the cover plate 27 and the mounting edge of the load-bearing inner ring casing 26 is cancelled, thereby effectively reducing the excessive thermal stress of the cover plate 27 caused by the incoordination of the deformation of the load-bearing inner ring casing 26 and the plug cover 25. Furthermore, the cover plate 27 can be made of elastic metal material to further improve its flexibility.

[0041] In the present application, the load-bearing inner ring casing 26 is configured to be a structure that is thicker and stronger than the upper portion of the cover plate 17 in the prior art.

[0042] like Figure 3 As shown, the inner ring centering ring 29 of the present application is provided with an inner stop 291 and an outer stop 292, and the two stops are respectively interference fit with the structural end faces of the inner ring fixing ring 24 and the load-bearing inner ring casing 26. During installation, the inner ring centering ring 29 is inserted through interference fit, and then connected and positioned with the inner ring fixing ring 24 and the installation edge of the load-bearing inner ring casing 26 through a bolt connector, and finally the cover plate 27 is assembled to realize the centering function of the guide.

[0043] In some embodiments of the present application, honeycomb rings are provided on the inner ring 23 and the inner ring fixing ring 24 for sealing.

[0044] In the turbine inter-casing guide centering and sealing structure provided by the present application, the inner stop and outer stop of the inner ring centering ring 29 are used to have an interference fit with the inner ring fixing ring 24 and the load-bearing inner ring casing 26, so that the inner ring 23 and the three honeycomb rings on the inner ring fixing ring 24 are centered with the load-bearing inner ring casing 26 in the turbine inter-casing, and fixed by connecting bolts. The present application changes the original guide blade radial pin centering structure to stop centering, which improves the reliability of centering; at the same time, the cover plate 27 is optimized for flexible structure and connected to the mounting edge of the inner ring fixing ring 24, which solves the problem of excessive thermal stress of the cover plate 27 caused by the incoordination of the deformation of the load-bearing inner ring casing 26 and the plug cover 25, which is beneficial to improving the reliability of the turbine structure and the service life of parts.

[0045] 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 centering and sealing structure for a turbine casing guide, characterized in that: include: Guide vanes, outer ring, inner ring, inner ring retaining ring, plugging cover, load-bearing inner ring casing, cover plate, bearing seat and inner ring centering ring; The upper edge plate of the guide blade 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; The inner ring is centered with radial pins of the guide blades; One side of the inner ring fixing ring is fixed to the inner side of the inner ring, and an inner ring centering ring is arranged between the other side of the inner ring fixing ring and the load-bearing inner ring casing, thereby realizing the centering of the entire guide structure; The bearing seat is installed on the inner side of the load-bearing inner ring casing, and a plug cover is installed on the bearing seat; One side of the cover plate is mounted on the inner ring centering ring through a connecting piece, and the other side of the cover plate is connected to a plug cover on the bearing seat.

2. The turbine casing guide centering and sealing structure according to claim 1, characterized in that: The lower edge plate of the guide blade is provided with a rectangular boss inserted into the inner ring, and the axial positioning of the guide blade and the inner ring is achieved through the rectangular boss.

3. The turbine casing guide centering and sealing structure according to claim 1, characterized in that: One side of the cover plate is connected through a connecting piece passing through the inner ring fixing ring, the inner ring centering ring and the cover plate.

4. The turbine casing guide centering and sealing structure according to claim 1 or 3, characterized in that: Compared with the existing cover plates, the cover plate is thinner and has a larger turning angle.

5. The turbine casing guide centering and sealing structure according to claim 4, characterized in that: The cover plate is made of elastic metal material.

6. The turbine casing guide centering and sealing structure according to claim 1, characterized in that: The inner ring centering ring is provided with an inner stopper and an outer stopper, and the inner stopper and the outer stopper are respectively interference fit with the inner ring fixing ring and the load-bearing inner ring casing.

7. The turbine casing guide centering and sealing structure according to claim 1, characterized in that: Honeycomb rings are provided on the inner ring and the inner ring fixing ring.

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