Turbine rotor structure and its dismounting device

Abstract

The application discloses a turbine rotor structure and a dismounting device thereof, and belongs to the technical field of aero-engines. The turbine rotor structure is used for driving a turbine impeller to rotate in an aero-engine casing and comprises a turbine shaft assembly used for connecting the turbine impeller. The turbine shaft assembly comprises a power turbine shaft and an elastic shaft. The power turbine shaft is a hollow shaft and is used for connecting the turbine impeller. The first end of the elastic shaft is arranged in the power turbine shaft and is used for driving the power turbine shaft to rotate. A driving gear is arranged at the second end of the elastic shaft outside the power turbine shaft. The driving gear is used for cooperating with a driving mechanism of the engine and driving the elastic shaft to rotate. A limiting nut is sleeved on the power turbine shaft. The driving gear is up and down clamped with the limiting nut. The limiting nut is used for limiting the axial freedom degree of the driving gear. The application further provides a dismounting device for dismounting the turbine rotor.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular, to a turbine rotor structure. Furthermore, this invention also relates to a disassembly and assembly device for the aforementioned turbine rotor structure. Background Technology

[0002] In the field of aero-engine technology, the turbine rotor assembly is a crucial power component. Traditional structures typically employ a power turbine shaft, a flexible shaft, and a drive gear. Current challenges include how to quickly and easily assemble the drive gear with the flexible shaft, and how to effectively limit the drive gear's movement to minimize its frequent axial runout and its impact on operation.

[0003] In addition, since the turbine rotor assembly is located inside the engine casing, where space is relatively limited, how to facilitate the disassembly and assembly of the turbine rotor assembly without affecting the installation of the casing as much as possible, and improve the efficiency of disassembly and assembly, is also an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to address the above problems by providing a turbine rotor structure that can quickly assemble the drive gear and the elastic shaft and limit the movement of the drive gear.

[0005] The present invention also provides a disassembly and assembly device for a turbine rotor structure, used for disassembling and assembling the aforementioned turbine rotor.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a turbine rotor structure for mounting within an aero-engine casing to drive a turbine impeller to rotate, comprising:

[0007] A turbine shaft assembly, comprising a power turbine shaft and an elastic shaft, wherein the power turbine shaft is a hollow shaft and is used to connect the turbine impeller, and the first end of the elastic shaft is disposed inside the power turbine shaft and is used to drive the power turbine shaft to rotate;

[0008] A drive gear is disposed at the second end of the elastic shaft located outside the power turbine shaft. The drive gear is used to cooperate with the drive mechanism of the aero-engine and drive the elastic shaft to rotate.

[0009] A limiting nut is sleeved on the power turbine shaft, and the driving gear is axially engaged with the limiting nut. The limiting nut is used to restrict the axial degree of freedom of the driving gear.

[0010] Furthermore, a boss is provided at the end of the drive gear that connects with the limiting nut, and a limiting flange is provided on the boss. A slot is provided at the end of the limiting nut that connects with the drive gear, and a limiting groove is provided on the slot. The boss is used to insert into the slot, and the limiting nut is used to be driven to rotate and drive the limiting groove to engage the limiting flange to axially limit the drive gear.

[0011] In addition, the present invention also discloses a turbine rotor disassembly and assembly device for disassembling the aforementioned turbine rotor, comprising:

[0012] A jaw assembly, comprising a jaw base and a plurality of jaws, wherein the plurality of jaws are arranged in a ring array and respectively hinged to the jaw base, and the plurality of jaws are used to clamp the limiting nut together;

[0013] A ferrule assembly, the ferrule assembly including a positioning sleeve, the first end of the positioning sleeve being used to fit over the drive gear and engage with the outer tooth surface of the drive gear.

[0014] Furthermore, the turbine rotor disassembly and assembly device also includes a drive handle, which is used to insert into the ferrule assembly or ferrule and drive the ferrule assembly or ferrule to rotate; the disassembly and assembly device also includes an anti-rotation plate, which is used to support the turbine rotor and the casing.

[0015] Furthermore, the sleeve assembly also includes a fixing sleeve, which is axially connected to the positioning sleeve. The fixing sleeve has a pair of through holes in the radial direction, and the rotating member is used to pass through the through holes onto the fixing sleeve.

[0016] Furthermore, the inner wall of the first end of the positioning sleeve has a plurality of positioning grooves arranged in a ring. The positioning grooves are used to embed the roller. The roller protrudes from one side of the positioning groove and is used to insert into the gap of the external teeth of the drive gear to lock the drive gear in place.

[0017] Furthermore, the card holder is a cylindrical structure with an open bottom, and the outer wall of the card holder is symmetrically provided with clearance grooves. The outer wall of the card holder is provided with mounting grooves in a ring array below the clearance grooves. The mounting grooves are used to hinge the card claws.

[0018] Furthermore, the top wall of the card holder is provided with a first limiting hole, which is used to cooperate with a torque wrench. The outer wall of the card holder is provided with a pair of second limiting holes above the clearance groove. The drive handle is used to pass through the second limiting holes to drive the handle on the card holder.

[0019] Furthermore, the chuck includes a body block, the first end of which is hinged to the chuck seat, and the second end of which is provided with a limiting platform protruding from the body block, the limiting platform being used to clamp the limiting nut.

[0020] Furthermore, the side of the limiting platform that fits with the limiting nut is an arc surface, and a limiting block is provided at the arc surface. The limiting block is used to cooperate with a pre-set clamping groove on the outer wall of the limiting nut.

[0021] The beneficial effects of this invention are:

[0022] 1. In order to solve the problem of quickly assembling the drive gear with the elastic shaft and limiting the drive gear to reduce its frequent axial runout, the present invention sets a limiting nut on the power turbine shaft. The limiting nut locks the drive gear and limits its axial movement, thereby preventing the drive gear from frequently running axially during operation and improving the stability of the transmission process.

[0023] 2. This invention employs a special assembly structure where a limiting nut and a drive gear engage. To address the challenge of quickly assembling and disassembling the turbine rotor assembly, including the limiting nut and drive gear, within the confined space of the engine casing, while simultaneously allowing operation without affecting the casing's installation, a clamping assembly is used to engage the drive gear, and a jaw assembly holds the limiting nut. Once the drive gear is engaged and limited, both the elastic shaft and the power turbine shaft are simultaneously limited. The jaw assembly then holds the limiting nut; rotating the jaw assembly rotates the limiting nut, thus disassembling and reassembling the engagement component between the limiting nut and the drive gear, allowing for the removal of both the drive gear and the limiting nut. The entire process is performed step-by-step, highly efficient and quick, and can be performed without first disassembling the bulky engine casing, significantly improving assembly and disassembly efficiency.

[0024] Of course, any product implementing this invention does not necessarily need to achieve all the advantages described above simultaneously. In addition to the objectives, features, and advantages described above, this invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the turbine rotor of a preferred embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the drive gear in a preferred embodiment of the present invention.

[0028] Figure 3 This is a half-sectional schematic diagram of the drive gear in a preferred embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the limiting nut according to a preferred embodiment of the present invention.

[0030] Figure 5 This is a half-sectional schematic diagram of the limiting nut according to a preferred embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the assembly / disassembly device and the turbine rotor in a preferred embodiment of the present invention.

[0032] Figure 7 This is a top view schematic diagram of the disassembly and assembly device according to a preferred embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the card holder according to a preferred embodiment of the present invention.

[0034] Figure 9 This is a schematic diagram of the claw structure of a preferred embodiment of the present invention.

[0035] Figure 10 This is a schematic diagram of the positioning sleeve according to a preferred embodiment of the present invention.

[0036] Legend: 100, turbine shaft assembly; 101, drive gear; 1011, boss; 102, limit nut; 1021, slot; 1022, clamping groove; 103, elastic shaft; 104, power turbine shaft; 1, drive handle; 2, mounting base; 201, clearance groove; 202, mounting groove; 3, fixing sleeve; 4, first cylindrical pin; 5, pawl; 501, limit platform; 502, limit block; 6, second cylindrical pin; 7, positioning sleeve; 701, fixing pin hole; 702, oblique semi-circular hole; 8, roller; 9, retaining ring; 10, anti-rotation plate. Detailed Implementation

[0037] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0038] A turbine rotor structure for mounting within an aircraft engine casing to drive a turbine impeller rotation includes:

[0039] A turbine shaft assembly 100 includes a power turbine shaft 104 and an elastic shaft 103. The power turbine shaft 104 is a hollow shaft and is used to connect the turbine impeller. The first end of the elastic shaft 103 is disposed inside the power turbine shaft 104 and is used to drive the power turbine shaft 104 to rotate.

[0040] A drive gear 101 is disposed at the second end of the elastic shaft 103 located outside the power turbine shaft 104. The drive gear 101 is used to cooperate with the drive mechanism of the aero-engine and drive the elastic shaft 103 to rotate.

[0041] A limiting nut 102 is sleeved on the power turbine shaft 104. The drive gear 101 is axially engaged with the limiting nut 102. The limiting nut 102 is used to restrict the axial degree of freedom of the drive gear 101.

[0042] Understandably, by setting a limiting nut 102 on the power turbine shaft 104, the limiting nut 102 engages the drive gear 101, limiting the axial movement of the drive gear 101 and preventing frequent axial runout during operation, thus improving the stability of the transmission process. Specifically, the drive gear and the elastic shaft can be connected by a spline, the elastic shaft and the power turbine shaft can also be connected by a spline, and the power turbine shaft and the power turbine impeller can be connected by evenly distributed pins. Therefore, the drive gear is axially fixed relative to the entire power turbine assembly, and fixing the drive gear from rotating is equivalent to fixing the power turbine assembly.

[0043] Preferably, please refer to Figure 2 , 3 As shown in Figures 4 and 5, the end of the drive gear 101 that connects with the limiting nut 102 is provided with a boss 1011, and the boss is provided with a limiting flange. The end of the limiting nut 102 that connects with the drive gear 101 is provided with a slot 1021, and the slot is provided with a limiting groove. The boss 1011 is used to insert into the slot 1021. The limiting nut 102 is used to be driven to rotate and drive the limiting groove to engage the limiting flange to axially limit the drive gear 101.

[0044] Understandably, after the strip-shaped boss 1011 is inserted into the long strip-shaped slot 1021, rotating the limiting nut 102 causes the slot 1021 and the boss 1011 to move in an alternating manner, so that the slot 1021 locks the boss 1011 in place, thereby realizing the upper and lower locking of the limiting nut 102 and the drive gear 101, which plays a role in axially limiting the drive gear 101 and improving the stability of the drive gear 101 operation.

[0045] In addition, the present invention also discloses a turbine rotor disassembly and assembly device for disassembling the aforementioned turbine rotor, comprising:

[0046] The claw assembly includes a base 2 and a plurality of claws 5. The plurality of claws 5 are arranged in a ring and are respectively hinged to the base 2. The plurality of claws 5 are used to clamp the limiting nut 102 to each other.

[0047] The ferrule assembly includes a positioning sleeve 7, the first end of which is used to be fitted onto the drive gear 101 and engage with the outer tooth surface of the drive gear 101.

[0048] It is understandable that by using a ferrule assembly to engage the drive gear 101 and a claw assembly to clamp the limit nut 102: when the drive gear 101 is engaged and limited, the elastic shaft 103 and the power turbine shaft 104 are simultaneously limited. At this time, the claw assembly clamps the limit nut 102, and by rotating the claw assembly, the limit nut 102 can be rotated, thereby realizing the disassembly and assembly of the engagement component between the limit nut 102 and the drive gear 101, and then removing the drive gear 101 and the limit nut 102.

[0049] Preferably, please refer to Figure 6 , 7 As shown, the turbine rotor disassembly and assembly device also includes a drive handle 1, which is used to insert the ferrule assembly or ferrule 2 and drive the ferrule assembly or ferrule 2 to rotate; the disassembly and assembly device also includes an anti-rotation plate 10, which is used to support the turbine rotor and the casing.

[0050] Understandably, without disassembling the casing, the anti-rotation plate 10 can support and limit the casing, i.e., the entire turbine rotor assembly. The anti-rotation plate 10 can be a square plate to limit the casing and prevent it from rotating. The drive handle 1 is a rod-shaped structure, and a square head structure can be set at one end of the drive handle 1 to facilitate mating with the square hole on the top of the card holder 2.

[0051] In this preferred embodiment, the sleeve assembly further includes a fixing sleeve 3, which is axially connected to the positioning sleeve 7. The fixing sleeve 3 has a pair of through holes radially open, and the rotating member 1 is used to pass through the through holes onto the fixing sleeve 3. Specifically, the fixing sleeve 3 can be connected to the positioning sleeve 7 via a first cylindrical pin 4. The fixing sleeve 3 can cooperate with a drive handle 1, which drives the fixing sleeve 3 and the positioning sleeve 7 to rotate. The fixing sleeve 3 can be made from scrap steel sleeves or steel pipes from the workshop, which helps to save costs.

[0052] Preferably, please refer to Figure 6 and Figure 10 As shown, the inner wall of the first end of the positioning sleeve 7 has a plurality of positioning grooves 702 arranged in a ring. The positioning grooves 702 are used to embed the roller 8. The roller 8 protrudes from one side of the positioning groove 702 and is used to insert into the gap of the external teeth of the drive gear 101 to lock the drive gear 101.

[0053] Understandably, the semi-circular hole 702 on the inner wall of the positioning sleeve 7 is used to install the limiting roller 8. The roller 8 is used to engage with the outer tooth surface of the driving gear 101 to lock the driving gear 101 in place, thereby achieving the locking of the positioning sleeve 7 and the fixing sleeve 3 onto the driving gear 101. When the driving gear 101 is a helical tooth, the semi-circular hole 702 can be opened at an angle accordingly. Specifically, the roller 8 can be welded or bonded to the semi-circular hole 702 using Vaseline. Of course, without considering the difficulty of processing, a ring array of protrusions can be directly machined on the inner wall of the positioning sleeve 7 for clearance engagement with the outer tooth of the driving gear 101.

[0054] Preferably, please refer to Figure 6 and Figure 8 As shown, the card holder 2 is a cylindrical structure with an open bottom. The outer wall of the card holder 2 is symmetrically provided with clearance grooves 201. The outer wall of the card holder 2 is provided with mounting grooves 202 in a ring array below the clearance grooves 201. The mounting grooves 202 are used to hinge the claws 5.

[0055] It is understandable that the clamping seat 2 holds the limiting nut 102 with the clamping claw 5. At this time, rotating the clamping seat 2 will drive the clamping claw 5 to rotate the limiting nut 102. In this preferred embodiment, the fixing sleeve 3 and the positioning sleeve 7 are provided inside the clamping seat 2. When the drive handle 1 passes through the through hole on the fixing sleeve 3, whether the drive handle 1 is rotated or the clamping seat 2 is rotated, the clearance groove 201 can provide clearance for the drive handle 1, preventing the clamping seat 2 from interfering with the drive handle 1. At the same time, the clearance groove 201 can also play a significant role in weight reduction, preventing the clamping seat 2 from being too heavy and affecting the disassembly and assembly work, or causing damage to the various components of the turbine rotor assembly.

[0056] Preferably, please refer to Figure 6 , 7 As shown in Figure 8, the top wall of the card holder 2 is provided with a first limiting hole, which is used to cooperate with a torque wrench. The outer wall of the card holder 2 is provided with a pair of second limiting holes above the clearance groove 201. The drive handle 1 is used to pass through the second limiting holes to drive the handle on the card holder 2.

[0057] It is understandable that the card holder 2 can be rotated either by inserting a torque wrench into the first limiting hole at the top of the card holder 2, or by inserting the drive handle 1 into the second limiting hole. Alternatively, the first limiting hole at the top of the card holder 2 can be made into a square hole, or the card holder 2 can be rotated by the square head at one end of the drive handle 1 or by using a T-shaped screw in conjunction with the square hole first limiting hole, so as to flexibly adjust the adjustment method of the card holder 2 according to the space inside the casing.

[0058] Preferably, please refer to Figure 1 and Figure 9As shown, the claw 5 includes a body block, the first end of which is hinged to the card holder 2. The second end of the body block is provided with a limiting platform 501 protruding from the body block, which is used to clamp the limiting nut 102. The side of the limiting platform 501 that is in contact with the limiting nut 102 is an arc surface, and a limiting block 502 is provided at this arc surface. The limiting block 502 is used to cooperate with a pre-set clamping groove 1022 on the outer wall of the limiting nut 102.

[0059] Understandably, the chuck 5 is hinged to the chuck seat 2. When the chuck seat 2 is sleeved on the elastic shaft 103, the positions of the chuck seat 2 and the chuck 5 can be flexibly adjusted to achieve the engagement of the chuck 5 with the limiting nut 102. At the same time, the arc surface of the limiting platform 501 can better fit the limiting nut 102 and reduce the damage to the nut surface caused by the limiting platform 501 when the chuck 5 rotates.

[0060] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0061] This document describes the principles and implementation methods of the present invention. The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A turbine rotor structure for mounting within the casing of an aero engine to drive a turbine impeller to rotate, characterized in that, include: The turbine shaft assembly (100) includes a power turbine shaft (104) and an elastic shaft (103). The power turbine shaft (104) is a hollow shaft and is used to connect the turbine impeller. The first end of the elastic shaft (103) is disposed inside the power turbine shaft (104) and is used to drive the power turbine shaft (104) to rotate. A drive gear (101) is disposed at the second end of the elastic shaft (103) outside the power turbine shaft (104). The drive gear (101) is used to cooperate with the drive mechanism of the aircraft engine and drive the elastic shaft (103) to rotate. A limiting nut (102) is sleeved on the power turbine shaft (104), and the drive gear (101) is axially engaged with the limiting nut (102). The limiting nut (102) is used to restrict the axial degree of freedom of the drive gear (101). The end of the drive gear (101) that connects with the limiting nut (102) is provided with a boss (1011), and the boss is provided with a limiting flange. The end of the limiting nut (102) that connects with the drive gear (101) is provided with a slot (1021), and the slot is provided with a limiting groove. The boss (1011) is used to insert into the slot (1021), and the limiting nut (102) is used to be driven to rotate and drive the limiting groove to engage the limiting flange to axially limit the drive gear (101).

2. A turbine rotor disassembly and assembly device, used for disassembling the turbine rotor structure as described in claim 1, characterized in that, include: The claw assembly includes a base (2) and a plurality of claws (5), the plurality of claws (5) are arranged in a ring and respectively hinged to the base (2), and the plurality of claws (5) are used to clamp the limiting nut (102) to each other. The ferrule assembly includes a positioning sleeve (7), the first end of which is used to be fitted onto the outside of the drive gear (101) and engage with the outer tooth surface of the drive gear (101).

3. The turbine rotor disassembly and assembly device according to claim 2, characterized in that, The turbine rotor disassembly and assembly device also includes a drive handle (1), which is used to insert the ferrule assembly or ferrule seat (2) and drive the ferrule assembly or ferrule seat (2) to rotate; the disassembly and assembly device also includes an anti-rotation plate (10), which is used to support the turbine rotor and the casing.

4. The turbine rotor disassembly and assembly device according to claim 3, characterized in that, The sleeve assembly also includes a fixing sleeve (3), which is axially connected to the positioning sleeve (7). The fixing sleeve (3) has a pair of through holes in the radial direction, and the drive handle (1) is used to pass through the through holes onto the fixing sleeve (3).

5. A turbine rotor disassembly and assembly device according to claim 2, characterized in that, The first end of the positioning sleeve (7) has a ring array of multiple positioning grooves (702) on its inner wall. The positioning grooves (702) are used to embed the roller (8). The roller (8) protrudes from one side of the positioning groove (702) and is used to insert into the gap of the external teeth of the drive gear (101) to lock the drive gear (101).

6. A turbine rotor disassembly and assembly device according to claim 2, characterized in that, The card holder (2) is a cylindrical structure with an open bottom. The outer wall of the card holder (2) is symmetrically provided with clearance grooves (201). The outer wall of the card holder (2) is provided with mounting grooves (202) in a ring array below the clearance grooves (201). The mounting grooves (202) are used to hinge the claws (5).

7. A turbine rotor disassembly and assembly device according to claim 6, characterized in that, The top wall of the card holder (2) is provided with a first limiting hole, which is used to cooperate with a torque wrench. The outer wall of the card holder (2) is provided with a pair of second limiting holes above the clearance groove (201). The drive handle (1) is used to pass through the second limiting holes to drive the handle on the card holder (2).

8. A turbine rotor disassembly and assembly device according to claim 3, characterized in that, The chuck (5) includes a body block, the first end of which is hinged to the chuck seat (2), and the second end of which is provided with a limiting platform (501) protruding from the body block. The limiting platform (501) is used to clamp the limiting nut (102).

9. A turbine rotor disassembly and assembly device according to claim 8, characterized in that, The side of the limiting platform (501) that is in contact with the limiting nut (102) is an arc surface, and a limiting block (502) is provided on the arc surface. The limiting block (502) is used to cooperate with the clamping groove (1022) preset on the outer wall of the limiting nut (102).

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