A turbine casing connection

Abstract

The application provides a turbine casing connecting structure, which comprises a rear casing support plate, a rear side of the rear casing support plate being a plane structure, a threaded hole being arranged on the plane structure, and an ear groove being arranged on a side of the threaded hole; an inner content tail nozzle; a lock plate, which is provided with a lug matched with the ear groove, and is arranged in the ear groove of the rear casing support plate; and a double-end bolt, one end of the double-end bolt being matched with the threaded hole of the rear casing support plate and being welded and fixed with the lock plate, and the other end of the double-end bolt being matched with a lock nut through the inner content tail nozzle, so that the connection between the rear casing support plate and the inner content tail nozzle is realized. The connecting structure is simple and convenient to operate, and the self-locking requirement of the bolt and the rear casing support plate is solved.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to a turbine casing connection structure. Background Technology

[0002] The turbine rear casing support plate of a high-bypass turbofan engine houses the internal exhaust nozzle. Therefore, the design of the turbine rear casing requires the design of the mounting structure between the turbine rear casing and the internal exhaust nozzle. While common turbine structures in aero-engines use self-locking nuts or bolts with safety pins, the turbine rear casing support plate of a high-bypass turbofan engine is hollow. The small internal space of the hollow structure prevents installation tools from reaching into the cavity of the support plate, and bolts or nuts cannot be installed on the inner side of the hollow plate, making a locking structure impossible. If screws are used to fix the turbine rear casing support plate and the internal exhaust nozzle to the outside of the support plate, the internal exhaust nozzle would need to be suspended in the air. Since there is no fixed mounting position between the rear casing support plate and the internal exhaust nozzle, and the internal exhaust nozzle is heavy, the installation process is extremely complex, making it difficult to achieve self-locking functionality and posing a significant operational risk. Summary of the Invention

[0003] The purpose of this application is to provide a turbine casing connection structure to solve or mitigate at least one of the problems in the prior art.

[0004] The technical solution of this application is: a turbine casing connection structure, the connection structure comprising:

[0005] The rear casing support plate has a flat structure on its rear side, and the flat structure is provided with threaded holes, and the side of the threaded holes is provided with ear grooves;

[0006] Internal tail nozzle;

[0007] A locking plate having a lug adapted to the ear slot, the locking plate being installed in the ear slot of the rear casing support plate;

[0008] The double-ended bolt has one end that mates with the threaded hole of the rear casing support plate and is welded and fixed to the locking plate, and the other end that passes through the inner tail nozzle and mates with the locking nut, thereby realizing the connection between the rear casing support plate and the inner tail nozzle.

[0009] In a preferred embodiment of this application, there are two ear slots distributed on both sides of the threaded hole, and the line connecting the two ear slots is perpendicular to the radial axis of the rear casing support plate.

[0010] In a preferred embodiment of this application, the lug of the locking plate is warped toward the inner end nozzle side.

[0011] In a preferred embodiment of this application, the two ends of the double-ended bolt are threaded rod structures, and a cylindrical boss is provided at the connection between the two threaded rod structures. The locking plate is welded to the cylindrical boss.

[0012] This application features a simple connection structure and convenient operation. It solves the self-locking requirement between the bolts and the rear casing support plate. Furthermore, after the bolts are assembled onto the rear casing support plate, installing the inner nozzle simply requires aligning the bolt holes on the inner nozzle mounting side with the bolts on the rear casing support plate and pushing it in. This provides directional guidance and avoids the problems associated with directly using external bolts, where aligning the inner nozzle and rear casing mounting holes is necessary. This avoids issues such as the lack of a mating stop between the inner nozzle and the rear casing, the difficulty of hoisting the heavy inner nozzle, and the challenges of aligning the mounting holes, leading to operational hazards. When the double-ended bolt threads are damaged and replacement is needed, the weld points between the locking plate and the double-ended bolt are ground off, allowing the double-ended bolt to be disassembled and replaced with a new one. This convenient operation does not affect the use of the rear casing, reduces the risk of damage to the rear casing, and lowers costs. Attached Figure Description

[0013] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0014] Figure 1 This is a schematic diagram of the turbine casing connection structure of this application.

[0015] Figure 2 This is a schematic diagram of the threaded holes in the rear casing support plate of this application.

[0016] Figure 3 This is a schematic diagram of the locking plate in this application.

[0017] Figure 4 This is a schematic diagram showing the installation positions of the locking plate and the rear casing support plate in this application.

[0018] Figure 5 This is a schematic diagram showing the welding position of the locking plate and the double-ended bolt in this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0020] This application addresses the design of bolts for the turbine rear casing support plate and the inner tail nozzle position of a high bypass ratio aero-engine, in order to solve the problem of bolts being unable to be tightened. It also designs double-ended bolts, which can be installed onto the rear casing support plate first, and the inner tail nozzle is positioned and supported by the bolts during installation, ensuring a simple installation process and safe operation.

[0021] like Figure 1 As shown, the turbine rear casing connection structure provided in this application mainly includes a rear casing support plate 1, an inner tail nozzle 2, a double-ended bolt 3, a self-locking nut 4, and a locking plate 5.

[0022] like Figure 2 As shown, the rear casing support plate 1 has a hollow structure, with its rear (right) side being a flat surface. A threaded hole is provided on the rear flat surface, and an ear groove 11 is provided on the side of the threaded hole. Preferably, there are two ear grooves 11, distributed on both sides of the threaded hole, and the line connecting the two ear grooves 11 is perpendicular to the radial axis of the rear casing support plate 1.

[0023] like Figures 3 to 4 As shown, the locking plate 5 has a lug 51 that fits into the lug 11, which mates with the lug 11 of the rear casing support plate 1. The locking plate 5 is welded and fixed to the double-ended bolt 3 as a whole, which can realize the anti-rotation of the double-ended bolt 3. Figure 5 As shown, in the preferred embodiment of this application, the lug 51 of the locking plate 5 is warped upward (i.e., on the side of the self-locking nut 4), which facilitates the disassembly and removal of the locking plate 5 during maintenance.

[0024] The double-ended bolt 3 has threaded rods at both ends and a cylindrical boss in the middle.

[0025] The installation process of the turbine rear casing connection structure in this application is as follows:

[0026] 1) First, install the locking plate 5 in the ear groove 11 of the rear casing support plate 1, and make the warped side of the locking plate 5 face outward (towards the self-locking nut 4).

[0027] 2) Then, pass the threaded rod of one end of the double-ended bolt 3 through the center hole of the locking plate 5, forming a clearance fit between the two. Tighten the double-ended bolt 3 so that it enters the threaded hole of the rear casing support plate 1, and make the rear casing support plate 1, the locking plate 5, and the double-ended bolt 3 fit together.

[0028] 3) After the double-ended bolt 3 is tightened, the cylindrical boss in the middle of the double-ended bolt 3 is welded and fixed to the locking plate 5. The rotation of the double-ended bolt 3 will drive the rotation of the locking plate 5. The locking plate 5 is fixed by its lug 51 and the ear groove 11 of the rear casing support plate 1. It is restricted by the ear groove 11 on the rear casing support plate 1, thereby realizing the locking of the double-ended bolt 5.

[0029] 4) Install the inner nozzle 2 on the other side of the double-ended bolt 3, and then tighten it from the outside using the self-locking nut 4 to complete the installation of the inner nozzle 4.

[0030] The turbine rear casing connection structure of this application addresses the characteristics of small internal space and poor operability of the rear casing support plate by using double-ended bolts, which are tightened from the outside in, making the process simple and easy to install. Then, the two parts are fixed together by welding the double-ended bolts to the locking plate. The lug of the locking plate matches the lug of the rear casing support plate. When the double-ended bolts are rotated, they will drive the locking plate to rotate. The locking plate is restricted by the rear casing support plate, thereby realizing the self-locking effect between the bolt and the rear casing support plate.

[0031] This application features a simple connection structure and convenient operation. It solves the self-locking requirement between the bolts and the rear casing support plate. Furthermore, after the bolts are assembled onto the rear casing support plate, installing the inner nozzle simply requires aligning the bolt holes on the inner nozzle mounting side with the bolts on the rear casing support plate and pushing it in. This provides directional guidance and avoids the problems associated with directly using external bolts, where aligning the inner nozzle and rear casing mounting holes is necessary. This avoids issues such as the lack of a mating stop between the inner nozzle and the rear casing, the difficulty of hoisting the heavy inner nozzle, and the challenges of aligning the mounting holes, leading to operational hazards. When the double-ended bolt threads are damaged and replacement is needed, the weld points between the locking plate and the double-ended bolt are ground off, allowing the double-ended bolt to be disassembled and replaced with a new one. This convenient operation does not affect the use of the rear casing, reduces the risk of damage to the rear casing, and lowers costs.

[0032] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A turbine casing connection structure, characterized in that, The connection structure includes: The rear casing support plate (1) has a planar structure on its rear side. The planar structure is provided with a threaded hole. The side of the threaded hole is provided with an ear groove (11). There are two ear grooves (11) and they are distributed on both sides of the threaded hole. The line connecting the two ear grooves (11) is perpendicular to the radial axis of the rear casing support plate (1). Internal tail nozzle (2); Locking plate (5), which has a lug (51) adapted to the ear groove (11), the locking plate (5) is installed in the ear groove (11) of the rear casing support plate (1), and the lug (51) of the locking plate (3) is bent toward the inner tail nozzle (2). The double-ended bolt (3) has a threaded rod structure at both ends. A cylindrical boss is provided at the connection of the two threaded rod structures. One end of the double-ended bolt (3) is engaged with the threaded hole of the rear casing support plate (1), and the cylindrical boss is welded and fixed to the locking plate (5). The other end passes through the inner tail nozzle (2) and engages with the locking nut (4), thereby realizing the connection between the rear casing support plate (1) and the inner tail nozzle (2).

Images