An external dismounting device and method for a mechanical seal of an aeroengine accessory gearbox

Abstract

The present application relates to the field of aero-engine accessory gearbox, and particularly relates to an external dismounting device and method for the mechanical seal of an accessory gearbox, which comprises a static ring dismounting device and a dynamic ring dismounting device, the static ring dismounting device is used for externally dismounting the static ring of the mechanical seal, and the dynamic ring dismounting device is used for externally dismounting the dynamic ring of the mechanical seal, the present application can externally dismount the mechanical seal of the accessory gearbox without disassembling the accessory gearbox, speed up the oil leakage efficiency of the mechanical seal, avoid the accessory gearbox to be repaired in the factory, and reduce the repair cost.

Description

Technical Field

[0001] This invention relates to the field of aircraft engine accessory housings, and more particularly to an external disassembly device and method for the mechanical seal of an accessory housing. Background Technology

[0002] Mechanical seals are commonly used for sealing the output shaft end of accessory housings in aircraft engines. Oil leakage is a frequent problem with mechanical seals during use. Current troubleshooting methods involve disassembling the entire accessory housing and then removing the mechanical seal for analysis, which suffers from low efficiency. Currently, there is no effective device or method for quickly removing the mechanical seal externally and troubleshooting oil leaks without disassembling the accessory housing. Summary of the Invention

[0003] The purpose of this invention is to provide an external disassembly device and method for the mechanical seal of an aero-engine accessory housing, which enables external disassembly of the mechanical seal, quickly pinpoints the cause of mechanical seal oil leakage, and improves the efficiency of mechanical seal oil leakage handling.

[0004] Technical solution of the present invention

[0005] An external disassembly device for the mechanical seal of an aero-engine accessory housing includes a stationary ring disassembly device and a rotating ring disassembly device. The stationary ring disassembly device is used to externally disassemble the stationary ring of the mechanical seal, and the rotating ring disassembly device is used to externally disassemble the rotating ring of the mechanical seal.

[0006] Furthermore, the described stationary ring disassembly device includes a stationary ring initial lifting structure, a disassembly structure, and a support structure. The disassembly structure passes through the stationary ring initial lifting structure and is connected to the support structure. The stationary ring initial lifting structure can rotate on the disassembly structure and move up and down along the disassembly structure.

[0007] Furthermore, the disassembly structure includes a connecting rod and a first handle, the upper end of the connecting rod is connected to the first handle, and the outer cylindrical surface of the connecting rod is threaded.

[0008] Furthermore, the initial rotating structure of the stationary ring includes a positioning rotating structure. The connecting rod passes through the positioning rotating structure, and the external thread on the outer cylindrical surface of the connecting rod is threaded with the positioning rotating structure, so that the positioning rotating structure can rotate and move up and down on the connecting rod. The bottom of the positioning rotating structure is provided with several rotating structures along the circumference, and there is a notch between every two adjacent rotating structures. The rotating structure includes an inclined surface and a plane provided at the rear end of the inclined surface.

[0009] Furthermore, the static ring initial rotation structure also includes a second handle, which is connected to the positioning rotation structure.

[0010] Furthermore, the support structure is provided with an inner hole, which includes a threaded hole and a smooth hole. The lower part of the connecting rod is provided with an external thread and a smooth rod, and the external thread and smooth rod of the lower part of the connecting rod are correspondingly engaged with the threaded hole and the smooth hole of the inner hole.

[0011] Furthermore, the described moving ring disassembly device is a clamp-type structure, including a clamp body structure and a clamp jaw structure. The clamp body structure includes a left clamp body and a right clamp body, which are arranged crosswise and rotatably connected at the intersection. The clamp jaw structure includes a left jaw and a right jaw. The upper part of the left jaw is rotatably connected to the upper part of the right clamp body, and the lower part of the left jaw is rotatably connected to the middle part of the left clamp body. The upper part of the right jaw is rotatably connected to the upper part of the left clamp body, and the lower part of the right jaw is rotatably connected to the middle part of the right clamp body. A pre-compressed spring is connected between the lower parts of the left and right clamp bodies.

[0012] Furthermore, a U-shaped groove structure is formed between the left and right jaws for engaging the moving ring.

[0013] A method for externally disassembling the mechanical seal of an aircraft engine accessory housing using the aforementioned device includes the following steps:

[0014] Step 1: Install the stationary ring disassembly device on the accessory housing, wherein the notch at the bottom of the positioning screw-up structure is aligned with the stationary ring anti-rotation plate, and at the same time, the lower part of the support structure contacts the end of the gear shaft inside the accessory housing, and the lower part of the positioning screw-up structure contacts the end face of the housing.

[0015] Step 2: Rotate the second handle of the stationary ring disassembly device. The inclined surface of the positioning lifting structure gradually contacts the anti-rotation plate of the stationary ring, and the stationary ring is initially lifted until the plane of the positioning lifting structure contacts the lower part of the anti-rotation plate.

[0016] Step 3: Rotate the first handle of the stationary ring disassembly device. The positioning and lifting structure moves upward along the connecting rod, and the stationary ring is removed together with the positioning and lifting structure.

[0017] Step 4: Grip the lower part of the left and right jaws of the rotating ring removal device, loosen the jaws, align the jaws of the rotating ring removal device with the edge of the rotating ring, press the jaws together, and remove the rotating ring.

[0018] Furthermore, it also includes the design steps for the stationary ring disassembly device and the dynamic ring disassembly device, which are performed before step 1.

[0019] Beneficial effects

[0020] This invention provides an external disassembly device and method for the mechanical seal of an aero-engine accessory housing. It allows for external disassembly of the mechanical seal without disassembling the accessory housing, thereby accelerating the oil leakage efficiency of the mechanical seal, avoiding the accessory housing from being returned to the factory for repair, and reducing repair costs. Attached Figure Description

[0021] Figure 1A schematic flowchart of the mechanical seal external disassembly device and method provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the mechanical seal stationary ring disassembly device provided by the present invention;

[0023] Figure 3 This is a schematic diagram of the mechanical seal dynamic ring disassembly device provided by the present invention;

[0024] Figure 4 This is a schematic diagram of the stationary ring.

[0025] Figure 5 This is a schematic diagram of the moving ring;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1—Connecting rod; 2—First handle; 3—Positioning and lifting structure; 4—Second handle; 5—Supporting structure; 6—Right clamp body; 7—Left clamp body; 8—Rivet a; 9—Rivet b; 10—Rivet c; 11—Jaw jaws. Detailed Implementation

[0028] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0029] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] One embodiment of the present invention provides an external disassembly device for the mechanical seal of an aero-engine accessory housing. The external disassembly device includes a stationary ring disassembly device and a rotating ring disassembly device. The stationary ring disassembly device is used to externally disassemble the stationary ring of the mechanical seal, and the rotating ring disassembly device is used to externally disassemble the rotating ring of the mechanical seal. This allows for the external disassembly and installation of the mechanical seal from outside the accessory housing.

[0031] In this embodiment, the mechanical seal stationary ring disassembly device includes a stationary ring initial lifting structure, a disassembly structure, and a support structure; the disassembly structure passes through the stationary ring initial lifting structure and is connected to the support structure, and the stationary ring initial lifting structure can rotate on the disassembly structure and move up and down along the disassembly structure.

[0032] In this embodiment, the disassembly structure includes a connecting rod and a first handle. The upper end of the connecting rod is provided with a through hole, and the first handle passes horizontally through the through hole, so that the upper end of the connecting rod is firmly connected to the first handle. The outer cylindrical surface of the connecting rod is provided with threads. By rotating the first handle, the purpose of moving the stationary ring to disassemble the stationary ring can be achieved.

[0033] In this embodiment, the initial static ring lifting structure includes a positioning lifting structure. A connecting rod passes through the positioning lifting structure, and the external thread on the outer cylindrical surface of the connecting rod engages with the thread of the positioning lifting structure, allowing the positioning lifting structure to rotate and move up and down on the connecting rod. The bottom of the positioning lifting structure has several lifting structures arranged along the circumference, with a notch between every two adjacent lifting structures. Each lifting structure includes an inclined surface and a flat surface located at the rear end of the inclined surface. The initial static ring lifting structure also includes a second handle, which is connected to the positioning lifting structure. By rotating the second handle, the inclined surface gradually contacts the sealing anti-rotation plate until the flat surface contacts the anti-rotation plate, thus achieving the purpose of lifting the static ring.

[0034] In this embodiment, the support structure is provided with an inner hole, which includes a threaded hole and a smooth hole. The lower part of the connecting rod is provided with an external thread and a smooth rod. The external thread and smooth rod at the lower part of the connecting rod correspond to and cooperate with the threaded hole and smooth hole of the inner hole. After the support structure is assembled on the connecting rod, it can move within a certain range.

[0035] In this embodiment, the moving ring disassembly device is a clamp-type structure, including a clamp body structure and a clamp jaw structure. The clamp body structure includes a left clamp body and a right clamp body, which are arranged crosswise and rotatably connected at the intersection. The clamp jaw structure includes a left clamp jaw and a right clamp jaw. The upper part of the left clamp jaw is rotatably connected to the upper part of the right clamp body, and the lower part of the left clamp jaw is rotatably connected to the middle part of the left clamp body. The upper part of the right clamp jaw is rotatably connected to the upper part of the left clamp body, and the lower part of the right clamp jaw is rotatably connected to the middle part of the right clamp body. A pre-compressed spring is connected between the lower parts of the left and right clamp bodies.

[0036] In this embodiment, a U-shaped groove structure is formed between the left and right jaws to engage the moving ring, ensuring that the left and right jaws can move within a certain range.

[0037] In this embodiment, to facilitate the disassembly of the rotating ring, the jaw structure and the mating position of the rotating ring adopt a straight structure.

[0038] A second embodiment of the present invention provides an external disassembly device for the mechanical seal of an aero-engine accessory casing, including a static ring disassembly device, a dynamic ring disassembly device structure, and an external disassembly method. For example... Figure 2 The stationary ring disassembly device includes a connecting rod 1, a handle 2, a positioning and lifting structure 3, a handle 4, and a support structure 5, allowing for stationary ring disassembly from outside the accessory housing. Figure 3 The rotating ring disassembly device includes a right clamp body 6, a left clamp body 7, a rivet 8, a rivet 9, a rivet 10, and a jaw 11, which can disassemble the stationary ring outside the accessory housing.

[0039] The third embodiment of the present invention provides a method for externally disassembling the stationary ring and the rotating ring using an external disassembly device for the mechanical seal of an aero-engine accessory housing, comprising the following steps:

[0040] Step 1: Determine the dimensions of the positioning and lifting structure 3 of the stationary ring disassembly device based on the dimensions of the housing and the stationary ring. In particular, the fit dimensions between the positioning and lifting structure 3 and the housing shaft hole and the dimensions of the inclined surface need to be carefully considered. An internal threaded hole is provided inside the positioning and lifting structure 3.

[0041] Step 2: Determine the external dimensions of the support structure 5, and the dimensions of the internal threaded hole and the smooth hole of the support structure 5, based on the outer diameter of the gear shaft end inside the accessory housing.

[0042] Step 3: Design connecting rod 1 based on positioning screw-up structure 3 and support structure 5. The upper part of connecting rod 1 is provided with a smooth hole to ensure the smooth installation of handle 2. The middle part of connecting rod 1 is a threaded structure to ensure that positioning screw-up structure 3 can move along the axial direction of connecting rod 1. The lower part of connecting rod 1 is designed with threads and a smooth rod to ensure that the support structure can move within a certain range after assembly.

[0043] Step 4: Determine the dimensions and opening size of the rotating ring disassembly device based on the dimensions of the housing and rotating ring.

[0044] Step 5: Based on this technology, complete the design of the external disassembly device for the mechanical seal of the accessory casing.

[0045] Step 6: After completing the machining of the external disassembly device for the mechanical seal of the accessory housing, carry out the external disassembly of the mechanical seal.

[0046] Step 7: Install the mechanical seal stationary ring disassembly device on the accessory housing. The notch of the initial lifting structure 3 should be aligned with the anti-rotation plate of the stationary ring to ensure that the lower part of the support structure 5 is in contact with the end of the gear shaft inside the accessory housing, and the lower part of the initial lifting structure 4 is in contact with the end face of the housing.

[0047] Step 8: Rotate the handle 4 of the stationary ring disassembly device. The inclined surface of the positioning and lifting structure 3 gradually contacts the anti-rotation plate of the stationary ring, and the stationary ring is initially lifted until the plane of the positioning and lifting structure 3 contacts the lower part of the anti-rotation plate.

[0048] Step 10: Rotate the stationary ring disassembly device to disassemble the handle 2. The positioning and lifting structure 3 is moved up along the connecting rod, and the stationary ring is removed together with the positioning and lifting structure 3.

[0049] Step 11: Loosen the jaws 11, align the jaws 11 of the moving ring removal device with the edge of the moving ring, tighten the jaws, and remove the moving ring.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. An external disassembly device for the mechanical seal of an aircraft engine accessory housing, characterized in that, It includes a mechanical seal stationary ring disassembly device and a dynamic ring disassembly device. The stationary ring disassembly device is used to externally disassemble the stationary ring of the mechanical seal, and the dynamic ring disassembly device is used to externally disassemble the dynamic ring of the mechanical seal.

2. The external disassembly device for the mechanical seal of the aero-engine accessory housing according to claim 1, characterized in that, The described stationary ring disassembly device includes a stationary ring initial lifting structure, a disassembly structure, and a support structure. The disassembly structure passes through the stationary ring initial lifting structure and is connected to the support structure. The stationary ring initial lifting structure can rotate on the disassembly structure and move up and down along the disassembly structure.

3. The external disassembly device for the mechanical seal of the aero-engine accessory housing according to claim 2, characterized in that, The disassembly structure includes a connecting rod and a first handle. The upper end of the connecting rod is connected to the first handle, and the outer cylindrical surface of the connecting rod is threaded.

4. The external disassembly device for the mechanical seal of the aero-engine accessory housing according to claim 3, characterized in that, The aforementioned static ring initial lifting structure includes a positioning lifting structure. A connecting rod passes through the positioning lifting structure, and the external thread on the outer cylindrical surface of the connecting rod engages with the thread of the positioning lifting structure, allowing the positioning lifting structure to rotate and move up and down on the connecting rod. The bottom of the positioning lifting structure has several lifting structures arranged along the circumference, with a notch between every two adjacent lifting structures. The lifting structure includes an inclined surface and a plane arranged at the rear end of the inclined surface.

5. The external disassembly device for the mechanical seal of the aircraft engine accessory housing according to claim 3, characterized in that, The static ring initial rotation structure also includes a second handle, which is connected to the positioning rotation structure.

6. The external disassembly device for the mechanical seal of the aircraft engine accessory housing according to claim 3, characterized in that, The support structure is provided with an inner hole, which includes a threaded hole and a smooth hole. The lower part of the connecting rod is provided with an external thread and a smooth rod, and the external thread and smooth rod of the lower part of the connecting rod are correspondingly engaged with the threaded hole and the smooth hole of the inner hole.

7. The external disassembly device for the mechanical seal of the aircraft engine accessory housing according to claim 1, characterized in that, The aforementioned rotating ring disassembly device is a clamp-type structure, including a clamp body structure and a clamp jaw structure. The clamp body structure includes a left clamp body and a right clamp body, which are arranged crosswise and rotatably connected at the intersection. The clamp jaw structure includes a left jaw and a right jaw. The upper part of the left jaw is rotatably connected to the upper part of the right clamp body, and the lower part of the left jaw is rotatably connected to the middle part of the left clamp body. The upper part of the right jaw is rotatably connected to the upper part of the left clamp body, and the lower part of the right jaw is rotatably connected to the middle part of the right clamp body. A pre-compressed spring is connected between the lower parts of the left and right clamp bodies.

8. The external disassembly device for the mechanical seal of the aircraft engine accessory housing according to claim 7, characterized in that, A U-shaped groove structure is formed between the left and right jaws for engaging the moving ring.

9. A method for externally disassembling the mechanical seal of an aircraft engine accessory housing using the apparatus described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Install the stationary ring disassembly device on the accessory housing, wherein the notch at the bottom of the positioning screw-up structure is aligned with the stationary ring anti-rotation plate, and at the same time, the lower part of the support structure contacts the end of the gear shaft inside the accessory housing, and the lower part of the positioning screw-up structure contacts the end face of the housing. Step 2: Rotate the second handle of the stationary ring disassembly device. The inclined surface of the positioning lifting structure gradually contacts the anti-rotation plate of the stationary ring, and the stationary ring is initially lifted until the plane of the positioning lifting structure contacts the lower part of the anti-rotation plate. Step 3: Rotate the first handle of the stationary ring disassembly device. The positioning and lifting structure moves upward along the connecting rod, and the stationary ring is removed together with the positioning and lifting structure. Step 4: Grip the lower part of the left and right jaws of the rotating ring removal device, loosen the jaws, align the jaws of the rotating ring removal device with the edge of the rotating ring, press the jaws together, and remove the rotating ring.

10. The method according to claim 9, characterized in that, It also includes the design steps for the stationary ring disassembly device and the dynamic ring disassembly device, which are performed before step 1.

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