Exhaust pipe, low pressure turbine shaft, aircraft engine and disassembly tool

Abstract

The application discloses an exhaust pipe, a low-pressure turbine shaft, an aero-engine and a disassembling tool. The exhaust pipe is used for an engine low-pressure turbine shaft and comprises a rear section exhaust pipe. A flange edge is arranged on the outer circumferential surface of the rear section exhaust pipe. The flange edge is provided with an inwardly extending flange. The inner circumferential side of the flange is provided with a notch. The flange edge of the rear section exhaust pipe has the notch, so that the disassembling tool can be conveniently mounted to the rear section exhaust pipe, and the disassembling tool is also convenient for replacing the rear section exhaust pipe. An integral disassembling tool matched with the rear section exhaust pipe is used. The concentricity of a stop table and the uniform stress of the flange are effectively improved. The risk of the exhaust pipe being pulled off is avoided. The stress is uniform and consistent during the disassembling process, and the disassembling process is coaxial. The non-moving stop table is arranged in cooperation with the flange to disassemble the rear section exhaust pipe. The structure is simple, the installation is convenient, and the disassembling efficiency is high.

Description

Technical Field

[0001] This invention relates to an exhaust pipe, a low-pressure turbine shaft, an aircraft engine, and a disassembly tool. Background Technology

[0002] The low-pressure turbine shaft of an aircraft engine has a built-in ventilation duct for expelling exhaust gas from the low-pressure chamber. The rear section of the exhaust pipe is inserted into the front section and is fitted into the inner hole of the low-pressure turbine support cone wall via an interference fit. Significant external force is required to disassemble the rear section of the exhaust pipe. To achieve disassembly of the existing exhaust pipe (rear section), a disassembly groove is provided on the exhaust pipe, with a complete annular flange at the rear end of the groove. Disassembly of this type of exhaust pipe requires segmented (or petal-shaped) pry bars as described in patent CN202120647630.3-assembly / disassembly tools and front support assembly / disassembly tools. A single-ring pry bar cannot be installed. However, using petal-shaped or movable pry bars to disassemble interference-fit parts presents drawbacks due to the large number of pry bars and the need for adjustment during installation. These drawbacks include difficulty in controlling the coaxiality of the pry bars and uneven force distribution, which can easily cause misalignment during disassembly, leading to excessive surface friction and damage. In some cases, the interference-fit parts may even fail to disassemble due to excessive misalignment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the problem that the outer end flange of the rear exhaust pipe in the low-pressure turbine shaft is a complete ring, which is inconvenient to disassemble, and that the rear exhaust pipe with interference connection is easily deflected and damaged when disassembled by existing disassembly tools. The present invention provides an exhaust pipe, a low-pressure turbine shaft, an aero engine and a disassembly tool.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] The present invention provides an exhaust pipe for use in a low-pressure turbine shaft of an engine, comprising a rear exhaust pipe, characterized in that the outer peripheral surface of the rear exhaust pipe is further provided with a flange edge, the flange edge having an inwardly extending flange, and the inner peripheral side of the flange having a notch.

[0006] In this design, the flange edge of the rear exhaust pipe has a notch, which facilitates the installation of disassembly tools into the rear exhaust pipe and also makes it easier to replace the rear exhaust pipe using disassembly tools.

[0007] Preferably, the number of the gaps is multiple.

[0008] In this design, multiple notches are provided to ensure the disassembly tool is more securely mounted on the rear exhaust pipe.

[0009] Preferably, the plurality of the notches are evenly arranged along the circumference of the flange.

[0010] In this design, in order to ensure that the force is evenly distributed during the process of the disassembly tool pulling out the rear exhaust pipe, multiple notches are set and evenly arranged along the circumference of the flange.

[0011] Preferably, the exhaust pipe further includes a front exhaust pipe, and the front exhaust pipe and the rear exhaust pipe are sealed together.

[0012] In this solution, the exhaust pipe also includes a front exhaust pipe, which is fixed and does not need to be replaced, making the overall structure more stable. The exhaust gas is discharged through the sealed rear exhaust pipe. At the same time, the rear exhaust pipe is detachable, and the exhaust gas will accumulate in the rear exhaust pipe. Simply replacing the rear exhaust pipe will achieve the effect of cleaning.

[0013] The present invention also provides a low-pressure turbine shaft, including the exhaust pipe described above.

[0014] In this design, the aforementioned exhaust pipe is used in the low-pressure turbine shaft.

[0015] The present invention also provides an aircraft engine including the aforementioned low-pressure turbine shaft.

[0016] In this design, the large displacement of aircraft engines leads to more severe contamination of the exhaust pipes, making the disassembly and reassembly of the rear exhaust pipes even more crucial.

[0017] The present invention also provides a disassembly tool for disassembling the exhaust pipe described above. The disassembly tool includes a disassembly cylinder, on which a baffle corresponding to the notch is provided. The baffle can rotate after passing through the notch and abut against the flange.

[0018] In this solution, a whole-tube disassembly tool is used, which effectively improves the concentricity of the baffle and the uniform force on the flange, avoids the risk of exhaust pipe deviation, and ensures that the force is uniform and coaxial during the disassembly process. At the same time, a non-movable baffle is set up to cooperate with the flange to disassemble the rear exhaust pipe. The structure is simple, easy to install, and has high assembly and disassembly efficiency.

[0019] Preferably, the disassembly tool further includes an anti-rotation cylinder, which is sleeved on the outer periphery of the disassembly cylinder and can rotate relative to it. The end of the anti-rotation cylinder near the notch is provided with anti-rotation teeth that protrude along the axial direction of the anti-rotation cylinder. The anti-rotation teeth correspond one-to-one with the notch and can be inserted into the notch.

[0020] When the anti-rotation tooth is inserted into the notch and the baffle rotates and abuts against the flange, the anti-rotation cylinder and the disintegration cylinder are fixed to each other.

[0021] In this design, to prevent the disassembly tool from rotating under force during the disassembly process and thus detaching from the exhaust pipe flange, an anti-rotation cylinder is provided on the outside of the disassembly cylinder. The anti-rotation teeth on the anti-rotation cylinder can fill the gap on the exhaust pipe flange, so that the anti-rotation cylinder and the exhaust pipe will not detach, thus improving the safety of the disassembly tool.

[0022] Preferably, the anti-rotation tooth matches the shape of the notch.

[0023] In this solution, to improve the anti-rotation effect, the shape of the anti-rotation teeth is matched with the notch, so that when the disassembly tool rotates under force, a very small misalignment is generated, achieving a good anti-rotation and anti-detachment effect.

[0024] Preferably, the disintegration cylinder is provided with a first locking hole, and the anti-rotation cylinder is provided with a second locking hole;

[0025] The disassembly tool also includes a pin that can be inserted into the first locking hole and the second locking hole to fix the anti-rotation cylinder and the disassembly cylinder to each other.

[0026] In this design, the anti-rotation cylinder and the disassembly cylinder are connected by a pin. After the pin is installed, the anti-rotation cylinder is positioned axially on the disassembly cylinder, ensuring that the anti-rotation teeth on the anti-rotation cylinder will not come out from the notch on the exhaust pipe flange, thus effectively preventing the disassembly cylinder from rotating and increasing the safety of using the disassembly tools.

[0027] Preferably, the anti-rotation cylinder further includes a lug, which is disposed at the end of the anti-rotation cylinder away from the anti-rotation tooth.

[0028] In this design, the lugs are designed to prevent the drum from rotating during handheld operation.

[0029] Preferably, there are multiple lugs, and the multiple lugs are arranged circumferentially along the anti-rotation cylinder.

[0030] In this design, the operator can observe the relative positions of the disassembly cylinder, anti-rotation cylinder, and exhaust pipe from the notches of adjacent lugs, improving the ease of installation of the disassembly tool.

[0031] Preferably, the disassembly tool further includes a slide hammer assembly, which includes a slide rod and a slide hammer. The slide rod is disposed at the end of the disassembly cylinder away from the notch, and the slide hammer can slide along the slide rod. The extension direction of the slide rod coincides with the axis of the disassembly cylinder.

[0032] In this solution, the inertia generated by the sliding hammer is used to pull out the rear exhaust pipe. Since the inertia generated by the sliding hammer is axial and does not include radial components, there will be no problem of deflection during the disassembly of the rear exhaust pipe.

[0033] Preferably, the slide bar and the disintegration cylinder are connected by a thread.

[0034] In this design, a threaded connection is provided to facilitate a stable connection between the slide weight assembly and the disassembly cylinder. This also facilitates the disassembly of the slide weight assembly, improving installation flexibility. Different sizes of slide weight assemblies can be installed according to different needs, improving overall adaptability and making replacement easier after damage.

[0035] The positive and progressive effects of this invention are as follows: the flange edge of the exhaust pipe has a notch, which facilitates the installation of the disassembly tool to the rear exhaust pipe and also facilitates the replacement of the rear exhaust pipe using the disassembly tool; the use of a matching cylindrical disassembly tool effectively improves the concentricity of the baffle and the uniform force on the flange, avoiding the risk of exhaust pipe deviation and ensuring uniform and coaxial force during the disassembly process; at the same time, the non-movable baffle and flange are used to disassemble the rear exhaust pipe, resulting in a simple structure, convenient installation, and high assembly and disassembly efficiency. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the exhaust pipe without the disassembly tool installed according to an embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram of the structure of an exhaust pipe according to an embodiment of the present invention.

[0038] Figure 3 This is a schematic diagram of the structure of a decomposition tool according to an embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram of the structure of a decomposition cylinder according to an embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of the anti-rotation cylinder according to an embodiment of the present invention.

[0041] Figure 6 This is a cross-sectional view of the structure of a disassembly tool installed in an exhaust pipe according to an embodiment of the present invention.

[0042] Figure 7 This is a schematic diagram of the structure of a disassembly tool according to an embodiment of the present invention, when it is installed in an exhaust pipe.

[0043] Explanation of reference numerals in the attached figures:

[0044] Rear exhaust pipe 1

[0045] Flange edge 2

[0046] Flange 3

[0047] Gap 4

[0048] Front exhaust pipe 5

[0049] Disassembly Tool 6

[0050] Decomposition Cylinder 7

[0051] Block 8

[0052] Anti-rotation cylinder 9

[0053] Anti-rotation tooth 10

[0054] First locking hole 11

[0055] Second locking hole 12

[0056] Pin 13

[0057] 14 protruding ears

[0058] Slide weight assembly 15

[0059] Slide bar 16

[0060] Slide 17

[0061] Thread 18 Detailed Implementation

[0062] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0063] like Figures 1-2 As shown, this embodiment discloses an aero-engine, including a low-pressure turbine shaft with an exhaust pipe inside. The exhaust pipe includes a rear exhaust pipe 1, and a flange 2 is provided on the outer circumferential surface of the rear exhaust pipe 1. The flange 2 has an inwardly extending flange 3, and a notch 4 is provided on the inner circumferential side of the flange 3. In this embodiment, the flange 2 is provided on the outer circumferential surface of the rear exhaust pipe 1, and the flange 2 has an inwardly extending flange 3. The notch 4 is provided on the inner circumferential side of the flange 3. The notch 4 allows a disassembly tool 6 to enter the rear exhaust pipe 1 through the notch 4 and disassemble the rear exhaust pipe 1 to remove the exhaust pipe. This avoids the disadvantages of traditional designs where the flange 3 of the flange 2 does not have a notch 4, and the disassembly tool 6 can only reach into the center of the exhaust pipe to hook the flange 2, resulting in low concentricity and uneven force. The design of the flange 3 with a notch 4 in this embodiment makes disassembly more convenient and faster.

[0064] The front exhaust pipe 5 is installed inside the low-pressure turbine shaft, and the flange edge 2 of the rear exhaust pipe 1 abuts against the inner wall of the low-pressure turbine shaft.

[0065] Among them, such as Figure 1 and Figure 2 As shown, there are multiple notches 4. The flange 3 on the flange edge 2 is provided with multiple notches 4, so that the disassembly tool 6 can extend into the inside of the flange edge 2 through multiple notches 4, thereby abutting against the flange 3.

[0066] Multiple notches 4 are evenly distributed around the flange 3. The multiple evenly distributed notches 4 can ensure that the exhaust pipe 1 receives uniform tension during disassembly, thus preventing the exhaust pipe 1 from tilting and being damaged.

[0067] like Figure 2 As shown, the exhaust pipe also includes a front exhaust pipe 5, which is sealed to the rear exhaust pipe 1. The sealing connection includes, but is not limited to, interference fits such as rubber rings, ensuring a tight seal while also facilitating the disassembly of the rear exhaust pipe 1.

[0068] like Figure 3 and Figure 4 As shown, this embodiment discloses a disassembly tool 6, which is used to disassemble the aforementioned exhaust pipe. The disassembly tool 6 includes a disassembly cylinder 7, on which a baffle 8 corresponding to the notch 4 is provided. The baffle 8 can rotate after passing through the notch 4 and abut against the flange 3. During disassembly, the baffle 8 on the disassembly cylinder 7 is aligned with the notch 4. After the baffle 8 extends into the notch 4, the disassembly cylinder 7 is rotated so that the baffle 8 abuts against the flange 3. At the same time, the disassembly cylinder 7 is pulled out to remove the rear section of the exhaust pipe 1.

[0069] like Figure 3 and Figure 4 As shown, the disassembly tool 6 also includes an anti-rotation cylinder 9, which is sleeved on the outer periphery of the disassembly cylinder 7 and can rotate relative to it. One end of the anti-rotation cylinder 9 near the notch 4 has anti-rotation teeth 10 protruding along its axial direction. Each anti-rotation tooth 10 corresponds to a notch 4 and can be inserted into the notch 4. When the anti-rotation tooth 10 is inserted into the notch 4 and the stop 8 rotates and abuts against the flange 3, the anti-rotation cylinder 9 and the disassembly cylinder 7 are fixed together. To prevent the disassembly tool 6 from rotating under force during the disassembly process and becoming disengaged from the exhaust pipe flange 2, the outer side of the disassembly cylinder 7 is provided with an anti-rotation cylinder 9. The anti-rotation teeth 10 on the anti-rotation cylinder 9 can fill the notch 4 on the exhaust pipe flange 2. When the anti-rotation cylinder 9 rotates, the anti-rotation teeth 10 abut against the flange 3, achieving a limiting and anti-rotation effect, preventing the anti-rotation cylinder 9 from becoming disengaged from the exhaust pipe and improving the safety of the disassembly tool 6.

[0070] The anti-rotation tooth 10 is shaped to match the notch 4. By matching the shape of the anti-rotation tooth 10 to the notch 4, when the anti-rotation cylinder 9 rotates, the anti-rotation tooth 10, which matches the shape of the notch 4, abuts against the flange 3, achieving a good limiting and anti-rotation effect.

[0071] like Figure 3 and Figure 4As shown, the disassembly cylinder 7 is provided with a first locking hole 11, and the anti-rotation cylinder 9 is provided with a second locking hole 12; the disassembly tool 6 also includes a pin 13, which can be inserted into the first locking hole 11 and the second locking hole 12 to fix the anti-rotation cylinder 9 and the disassembly cylinder 7 together. To prevent the anti-rotation cylinder 9 from detaching from the rear exhaust pipe 1, the disassembly cylinder 7 and the anti-rotation cylinder 9 are provided with a first locking hole 11 and a second locking hole 12; as shown Figure 7 As shown, when the anti-rotation cylinder 9 and the decomposition cylinder 7 reach the preset position, the pin 13 is inserted into the overlapping first locking hole 11 and second locking hole 12, so that the anti-rotation cylinder 9 and the decomposition cylinder 7 are locked on the rear exhaust pipe 1.

[0072] like Figure 5 As shown, the anti-rotation cylinder 9 also includes a lug 14, which is located at the end of the anti-rotation cylinder 9 away from the anti-rotation tooth 10. The lug 14 facilitates the operator to rotate the anti-rotation cylinder 9 and align the anti-rotation tooth 10 with the notch 4, etc.

[0073] The device includes multiple lugs 14 arranged circumferentially along the anti-rotation cylinder 9. The operator can observe the relative positions of the disassembly cylinder 7, the anti-rotation cylinder 9, and the exhaust pipe through the notches 4 of adjacent lugs 14, improving the ease of installation of the disassembly tool 6.

[0074] like Figure 6 As shown, the disassembly tool 6 also includes a sliding hammer assembly 15, which includes a sliding rod 16 and a sliding hammer 17. The sliding rod 16 is located at the end of the disassembly cylinder 7 away from the notch 4, and the sliding hammer 17 can slide along the sliding rod 16. The extension direction of the sliding rod 16 coincides with the axis of the disassembly cylinder 7. By using the sliding hammer assembly 15 to disassemble the exhaust pipe 1 at the rear end through the inertia of the sliding hammer 17, the problem of damage caused by the operator directly pulling out the disassembly cylinder 7 and causing the force direction of the disassembly cylinder 7 to be deflected is avoided.

[0075] The slide bar 16 and the disassembly cylinder 7 are connected by a threaded connection 18. The threaded connection 18 facilitates a stable connection between the slide hammer assembly 15 and the disassembly cylinder 7, and also facilitates the disassembly of the slide hammer assembly 15, improving installation flexibility. Different sizes of slide hammer assemblies 15 can be installed according to different needs, improving overall adaptability and facilitating replacement in case of damage. In other possible embodiments, the connection method between the slide hammer assembly 15 and the disassembly cylinder 7 includes, but is not limited to, integral molding, welding, and other connection methods.

[0076] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A decomposition tool, characterized in that, The disassembly tool is used to disassemble the exhaust pipe, which is used for the low-pressure turbine shaft of the engine and includes a rear exhaust pipe. The outer peripheral surface of the rear exhaust pipe is also provided with a flange edge, the flange edge is provided with an inwardly extending flange, and the inner peripheral side of the flange is provided with a notch. The disassembly tool includes a disassembly cylinder, which has a baffle corresponding to the notch. The baffle can rotate after passing through the notch and abut against the flange.

2. The decomposition tool as described in claim 1, characterized in that, The disassembly tool also includes an anti-rotation cylinder, which is sleeved on the outer periphery of the disassembly cylinder and can rotate relative to it. The anti-rotation cylinder has anti-rotation teeth protruding along the axial direction of the anti-rotation cylinder at one end near the notch. The anti-rotation teeth correspond one-to-one with the notch and can be inserted into the notch. When the anti-rotation tooth is inserted into the notch and the baffle rotates and abuts against the flange, the anti-rotation cylinder and the disintegration cylinder are fixed to each other.

3. The decomposition tool as described in claim 2, characterized in that, The anti-rotation teeth match the shape of the notch.

4. The decomposition tool as described in claim 2, characterized in that, The decomposition cylinder is provided with a first locking hole, and the anti-rotation cylinder is provided with a second locking hole; The disassembly tool also includes a pin that can be inserted into the first locking hole and the second locking hole to fix the anti-rotation cylinder and the disassembly cylinder to each other.

5. The decomposition tool as described in claim 2, characterized in that, The anti-rotation cylinder also includes a lug, which is located at the end of the anti-rotation cylinder away from the anti-rotation tooth.

6. The decomposition tool as described in claim 5, characterized in that, The lugs are multiple in number and are arranged circumferentially along the anti-rotation cylinder.

7. The decomposition tool as described in claim 1, characterized in that, The disassembly tool further includes a slide hammer assembly, which includes a slide rod and a slide hammer. The slide rod is located at the end of the disassembly cylinder away from the notch, and the slide hammer can slide along the slide rod. The extension direction of the slide rod coincides with the axis of the disassembly cylinder.

8. The decomposition tool as described in claim 7, characterized in that, The slide bar and the disintegration cylinder are connected by a thread.

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