Anti-rotation boltless sealing baffle mounting structure

Abstract

The application provides an anti-rotation boltless sealing baffle mounting structure, which comprises a turbine disc, a side edge of the turbine disc having a radial protrusion, the radial protrusion forming a turbine disc mounting edge, and the turbine disc mounting edge being provided with a turbine disc groove in the circumferential direction; a sealing baffle, the sealing baffle having a baffle mounting edge on one side corresponding to the turbine disc mounting edge, and the baffle mounting edge being provided with a plurality of baffle grooves uniformly distributed in the circumferential direction; and an elastic ring, the elastic ring being of an open structure, the elastic ring being provided with a front hook-shaped protrusion and a rear hook-shaped protrusion, the front hook-shaped protrusion and the rear hook-shaped protrusion and the elastic ring body forming an S-shaped structure, the elastic ring being arranged between the sealing baffle and the turbine disc, the front hook-shaped protrusion of the elastic ring being arranged in the turbine disc groove on the turbine disc, and the rear hook-shaped protrusion of the elastic ring being arranged in the baffle groove on the sealing baffle. The application not only realizes the anti-rotation function, but also effectively avoids the risk of missing and misassembling parts, and has good structural reliability.

Description

Technical Field

[0001] This application belongs to the field of aero-engines, and specifically relates to an anti-rotation boltless sealing baffle mounting structure. Background Technology

[0002] The front and rear sealing baffles of the high / low pressure turbine disk in aero engines are responsible for the axial positioning of the turbine rotor blades and the sealing of the blade roots, and are important functional components on the turbine rotor. For turbine rotors with very high rotational speeds, the sealing baffles bear very high centrifugal loads. The sealing baffles and the turbine disk are usually connected without bolts to prevent excessive local stress in the connection holes from failing to meet the reliability and service life requirements of the parts.

[0003] Currently, boltless sealing baffles often use a structure with an elastic ring (with an opening in the circumferential direction) for connection. This structure lacks reliable anti-rotation function and cannot be used in situations requiring circumferential positioning and anti-rotation of the sealing baffle. Furthermore, during turbine rotor operation, the sealing baffle and elastic ring are prone to circumferential movement relative to the turbine disk, which may have an adverse effect on rotor vibration.

[0004] like Figure 1 and Figure 2 To achieve the anti-rotation function, sometimes a sealing baffle 13 with alternating boss-groove features and the mounting edge of the turbine disk 11 are screwed in and clamped to limit the turbine blade 12. To prevent the sealing baffle 13 from unscrewing during operation, one or more plugs 14 are usually inserted into the groove to prevent rotation. At the same time, to install the plugs 14, pins or locking pieces 15 with pins need to be installed. After the sealing baffle 23 and the turbine disk 11 are screwed in, the bosses of the two are axially fitted through a large number of discontinuous surfaces (the area of ​​the discontinuous fitting surface is less than half of that of the non-discontinuous state), resulting in poor connection rigidity and reliability. Moreover, there is a risk of misinstallation or omission of the plugs and pins (locking pieces) in this structure, which may lead to the serious consequence of the sealing baffle coming off, further affecting its structural reliability. Summary of the Invention

[0005] The purpose of this application is to provide a boltless anti-rotation sealing baffle mounting structure to solve or mitigate at least one of the problems in the prior art.

[0006] The technical solution of this application is: an anti-rotation boltless sealing baffle installation structure, comprising:

[0007] A turbine disk, wherein the side of the turbine disk has a radial protrusion, the radial protrusion forms a turbine disk mounting edge, and a turbine disk groove is provided on the circumferential side of the turbine disk mounting edge;

[0008] A sealing baffle, wherein the sealing baffle has a baffle mounting edge on one side corresponding to the turbine disk mounting edge, and the baffle mounting edge is provided with a plurality of circumferentially evenly distributed baffle grooves;

[0009] The elastic ring has an open structure and is provided with a front hook boss and a rear hook boss. The front hook boss and the rear hook boss together form an S-shaped structure with the elastic ring body. The elastic ring is disposed between the sealing baffle and the turbine disk. The front hook boss of the elastic ring is disposed in the turbine disk groove on the turbine disk, and the rear hook boss of the elastic ring is disposed in the baffle groove on the sealing baffle.

[0010] In a preferred embodiment of this application, the circumferential length of the turbine disk groove does not exceed 5% of the circumference of the turbine disk mounting edge.

[0011] In a preferred embodiment of this application, the number of baffle grooves is not less than 6.

[0012] In a preferred embodiment of this application, the front hook boss and the rear hook boss of the elastic ring are located at the same position in the circumferential direction and are located symmetrically to the opening.

[0013] In a preferred embodiment of this application, the axial contact surface between the elastic ring body and the turbine disk mounting edge is the positioning base surface, and the positioning base surface is circumferentially continuous through turning.

[0014] Compared with the traditional boltless baffle connection structure, this application only requires a turbine disk groove in a small area on the turbine disk mounting edge. This ensures the contact area and connection rigidity between the sealing baffle and the turbine disk to achieve the anti-rotation function, while effectively avoiding the risk of missing or incorrect parts installation. It has good structural reliability, and the structure design of the elastic ring has good processing and assembly processability. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the installation structure of a sealing baffle in the prior art.

[0017] Figure 2 For based on Figure 1 A schematic diagram of direction A.

[0018] Figure 3 This is a schematic diagram of the installation structure of the anti-rotation boltless sealing baffle in this application.

[0019] Figure 4 for Figure 3 Enlarged schematic diagram at point I in the middle.

[0020] Figure 5 for Figure 4 Schematic diagram of direction B in the middle.

[0021] Figure 6 This is a three-dimensional schematic diagram of the sealing baffle in this application.

[0022] Figure 7 This is a three-dimensional schematic diagram of the elastic ring in this application. Detailed Implementation

[0023] 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.

[0024] In order to overcome the problems that most existing boltless sealing baffles do not have anti-rotation function, or that boltless sealing baffles with anti-rotation function have poor connection rigidity and reliability, this application provides an anti-rotation boltless sealing baffle installation structure.

[0025] like Figures 3 to 7 As shown, the anti-rotation boltless sealing baffle mounting structure 20 provided in this application includes: a sealing baffle 21, a turbine disk 22, and an elastic ring 23.

[0026] The turbine disk 22 supports the turbine blades 24 via a tenon-and-groove structure. Both the front and rear sides of the turbine disk 22 and the turbine blades 24 are sealed by sealing baffles 21. In the following embodiments, the front sealing baffle 21 is used as an example for explanation; the installation structure of the rear sealing baffle is the same and will not be described again.

[0027] The front side of the turbine disk 22 has a radial protrusion that forms a turbine disk mounting edge. An annular mounting groove 222 can be formed between the turbine disk mounting edge and the turbine disk body. A turbine disk recess 221 is provided circumferentially on the turbine disk mounting edge. In a preferred embodiment of this application, the width of the turbine disk recess 221 in the circumferential direction does not exceed 5% of the circumference.

[0028] The sealing baffle 21 is generally arc-shaped, with its upper mounting edge abutting against the turbine disk 22 or turbine rotor blade 24. Multiple evenly distributed baffle grooves 211 are provided on the lower mounting edge of the sealing baffle 21, typically numbering no fewer than six. For example, in this application… Figure 5 In the embodiment of the sealing baffle shown, it has nine baffle grooves 211 distributed circumferentially.

[0029] The elastic ring 23 has an open structure with an opening 233. In this embodiment of the application, the opening is a straight opening (i.e., the opening axis coincides with the diameter), but in other embodiments of the application, the opening 233 may also be an oblique opening (i.e., the opening axis forms an angle with the diameter). The open elastic ring 23 has a front hook boss 231 and a rear hook boss 232, which are located at the same position in the circumferential direction and approximately symmetrical to the opening 233. The front hook boss 231 and the rear hook boss 232 form an S-shaped structure with the elastic ring body. The elastic ring 23 is disposed between the sealing baffle 21 and the turbine disk 22. The front hook boss 231 of the elastic ring 23 is adapted to the turbine disk groove 221 on the turbine disk 22, and the rear hook boss 232 of the elastic ring 23 is adapted to the baffle groove 211 on the sealing baffle 21.

[0030] In this application, by setting a rear hook boss 232 on the elastic ring 23 and setting multiple baffle grooves 211 on the sealing baffle 21, when the rear hook boss 232 and the baffle grooves 211 are installed together, a suitable circumferential adjustment space can be provided for the assembly of the sealing baffle 21, which facilitates the adjustment of rotor balance.

[0031] In a preferred embodiment of this application, the axial contact surface between the body of the elastic ring 23 and the mounting edge of the turbine disk 22 is the positioning base surface. To ensure the flatness of the contact surface and the control accuracy of the relevant assembly dimensions, the circumferential continuity of the contact surface of the elastic ring can be achieved by turning.

[0032] The assembly process of the anti-rotation boltless sealing baffle mounting structure of this application is as follows: First, the elastic ring 23 is clamped and released at the opening 233, and the elastic ring 23 is dropped into the annular mounting groove 222 on the turbine disk 22. The front hook boss 231 of the elastic ring 23 extends into the turbine disk groove 221 on the turbine disk mounting edge. The opening 233 of the elastic ring 23 is clamped and contracted until the outer surface of the elastic ring 23 is lower than the inner surface of the upper mounting edge of the sealing baffle 21, and then pressed in (or Rotate the sealing baffle 21 so that one of the baffle grooves 211 on the upper mounting side of the sealing baffle 21 aligns with the rear hook protrusion 232 of the elastic ring 23; then loosen the elastic ring 23 so that the front hook protrusion 231 and the rear hook protrusion 232 of the elastic ring 23 are respectively inserted into the turbine disk groove 221 of the turbine disk 22 and the baffle groove 211 of the sealing baffle 21, so as to prevent the sealing baffle 21, the turbine disk 22 and the elastic ring 33 from rotating relative to each other, thereby achieving the anti-rotation function.

[0033] Compared with the traditional boltless baffle connection structure, this application only requires a turbine disk groove in a small area on the turbine disk mounting edge. This ensures the contact area and connection rigidity between the sealing baffle and the turbine disk to achieve the anti-rotation function, while effectively avoiding the risk of missing or incorrect parts installation. It has good structural reliability, and the structure design of the elastic ring has good processing and assembly processability.

[0034] 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 boltless anti-rotation sealing baffle installation structure, characterized in that, include: A turbine disk, wherein the side of the turbine disk has a radial protrusion, the radial protrusion forms a turbine disk mounting edge, and a turbine disk groove is provided on the circumferential side of the turbine disk mounting edge; A sealing baffle, wherein the sealing baffle has a baffle mounting edge on one side corresponding to the turbine disk mounting edge, and the baffle mounting edge is provided with a plurality of circumferentially evenly distributed baffle grooves; An elastic ring, which has an open structure, is provided with a front hook boss and a rear hook boss. The front hook boss and the rear hook boss form an S-shaped structure with the elastic ring body. The elastic ring is disposed between the sealing baffle and the turbine disk. The front hook boss of the elastic ring is disposed in the turbine disk groove on the turbine disk. The opening of the elastic ring is clamped and contracted until the outer surface of the elastic ring is lower than the inner surface of the upper mounting edge of the sealing baffle. The sealing baffle is pressed in or rotated so that one of the baffle grooves on the upper mounting edge of the sealing baffle is aligned with the rear hook boss of the elastic ring. Then the elastic ring is released so that the front hook boss and the rear hook boss of the elastic ring are respectively inserted into the turbine disk groove of the turbine disk and the baffle groove of the sealing baffle.

2. The anti-rotation boltless sealing baffle installation structure as described in claim 1, characterized in that, The circumferential length of the turbine disk groove does not exceed 5% of the circumference of the turbine disk mounting edge.

3. The anti-rotation boltless sealing baffle installation structure as described in claim 1, characterized in that, The number of grooves in the baffle is no less than 6.

4. The anti-rotation boltless sealing baffle installation structure as described in claim 1, characterized in that, The front hook boss and the rear hook boss of the elastic ring are located at the same position in the circumferential direction and are located symmetrically to the opening.

5. The anti-rotation boltless sealing baffle installation structure as described in claim 1, characterized in that, The axial contact surface between the elastic ring body and the turbine disk mounting edge is the positioning base surface, and the positioning base surface is circumferentially continuous through turning.

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