Composite material blanking cap for large turbofan aero-engine
By using carbon fiber mixed glass fiber composite materials and resin-based fiber reinforced composite materials, combined with flange structure and fireproof cloth layers, the forming accuracy and strength problems of traditional cover structures are solved, and lightweight design and efficient sealing effect are achieved , ensuring the safety and reliability of the inlet and exhaust duct of the aircraft engine.
Patent Information
- Application Number
- CN202420852208.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-23
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-23
AI Technical Summary
The cover blocking structure of traditional large turbofan aircraft engines has problems such as low forming accuracy, low strength, easy deformation and looseness, heavy weight, high failure rate, poor matching and interchangeability, and it is difficult to effectively seal the inlet and exhaust duct to prevent Foreign objects such as wind, sand, rain and snow enter.
The cover is made of composite materials made of carbon fiber mixed glass fiber as the main material. Combined with the advantages of resin-based fiber reinforced composite materials, a lightweight structure is designed, and the flange structure, reinforcement ribs, fireproof cloth layer, elastic tethering rope, etc. Technology to ensure the strength, safety and reliability of the plug cover.
The lightweight design of the blocking cover is realized, which improves the overall performance, improves the strength and safety of the blocking cover, ensures the reliability and safety of the blocking, reduces production costs, and increases service life.
Smart Images
Figure CN222276758U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of aviation support equipment manufacturing, and specifically relates to a composite material plugging cover for a large turbofan aero-engine. Background Art
[0002] The air inlet of a certain large turbofan aircraft engine is a large-sized multi-curved asymmetric special-shaped structure. The exhaust duct is divided into an outer exhaust duct and an inner exhaust duct, and there are many irregular surfaces and backward-converging inverted cone structures. When the aircraft is parked on the ground, the engine's air inlet and exhaust ducts need to be blocked and protected respectively to prevent foreign objects such as wind, sand, rain and snow from entering the engine. The main body of the traditional engine plug cover mostly adopts an aluminum alloy stamping and riveting structure. During the manufacturing and use process, there are problems such as low forming precision, low strength, easy deformation and loosening, heavy weight, high failure rate, poor matching and interchangeability. Utility Model Content
[0003] The purpose of the utility model is to provide a composite plugging cover for a large turbofan aircraft engine, which can be used for plugging the air inlet and exhaust ducts of the large turbofan aircraft engine, thereby ensuring the reliability of the plugging. Moreover, the main structure of the plugging cover uses carbon fiber mixed with glass fiber as the main material, and fully utilizes the advantages of resin-based fiber-reinforced composite materials such as low weight and high strength and structural designability. Its weight ratio is more than 33% lighter than that of aluminum alloy, which can fully realize lightweight design and improve the comprehensive performance of the product.
[0004] In order to achieve the above technical features, the purpose of the utility model is achieved as follows: a large turbofan aircraft engine composite plugging cover, including an engine air inlet plugging cover for plugging the engine air inlet;
[0005] Also included is an engine left outer culvert exhaust port plugging cover for plugging the engine left outer culvert exhaust port;
[0006] Also included is an engine right outer culvert exhaust port plugging cover for plugging the engine right outer culvert exhaust port;
[0007] Also included is an internal exhaust port plugging cover for plugging the internal exhaust port of the engine;
[0008] The inner exhaust port plugging cover is connected to a tail nozzle plugging cover used for sealing the engine tail nozzle center pipe.
[0009] A direction mark for indicating the installation direction is arranged at the central part of the engine air intake duct plugging cover, and a sign is arranged below the direction mark.
[0010] The main structures of the engine air intake cover, the engine left outer duct exhaust port cover, the engine right outer duct exhaust port cover, the inner duct exhaust port cover and the tail nozzle cover are all made of carbon fiber mixed with glass fiber as the main material.
[0011] The engine air intake duct plugging cover, the engine left outer duct exhaust port plugging cover, the engine right outer duct exhaust port plugging cover, the inner duct exhaust port plugging cover and the tail nozzle plugging cover are all equipped with a flanged structure at the parts that are easy to contact with the engine. The flanged structure includes an outer layer of canvas sewn at the edge by nylon thread, and the inner layer of the outer layer of canvas is provided with a soft sponge rubber plate for support.
[0012] The main structures of the engine air intake duct plugging cover, the engine left outer duct exhaust port plugging cover, the engine right outer duct exhaust port plugging cover, the inner duct exhaust port plugging cover and the tail nozzle plugging cover are all provided with raised reinforcing rib structures.
[0013] Handles are fixed on the main structures of the engine air intake duct plugging cover, the engine left outer duct exhaust port plugging cover, the engine right outer duct exhaust port plugging cover and the inner duct exhaust port plugging cover, and warning flags are hung on the handles.
[0014] The tail nozzle plugging cover adopts a conical structure, a tail cone handle is arranged at the tail end of the conical structure, a tail cone fireproof cloth layer for contacting the aircraft is arranged on the conical surface of the conical structure, and the tail cone handle is connected to the inner exhaust port plugging cover by an elastic mooring rope.
[0015] The outer edge of the inner exhaust port plugging cover is provided with an inner exhaust port plugging cover fireproof cloth layer for contacting with the aircraft.
[0016] The utility model has the following beneficial effects:
[0017] 1. The utility model provides a composite plugging cover for a large turbofan aircraft engine, wherein the main structure of the plugging cover is mainly made of carbon fiber mixed with glass fiber.
[0018] 2. Make full use of the advantages of resin-based fiber-reinforced composite materials such as low weight, high strength and structural design. Its weight ratio is more than 33% lighter than that of aluminum alloy, which can fully realize lightweight design and improve the overall performance of the product.
[0019] 3. Multiple raised reinforcing rib structures are set on the plug cover structure to improve the overall strength.
[0020] 4. An integrated flange structure is provided on the inner and outer culvert plugging covers to limit the outer lip of the exhaust duct to prevent the plugging cover from falling into the inverted cone exhaust duct due to excessive force or improper operation during assembly.
[0021] 5. The cover structure of the plugging cover is made of composite prepreg, which is layered on the mold and then made into a vacuum bag, evacuated and put into the autoclave for heating, pressurization and curing to form an integrated whole.
[0022] 6. A riveted aluminum alloy handle structure is provided on the plug cover to facilitate the transportation and disassembly of the plug cover.
[0023] 7. A soft rubber sponge pad is installed at the contact part between the plug cover and the aircraft and is covered with canvas to protect the aircraft structure from damage and ensure that the plug cover has an appropriate fit tightness when installed.
[0024] 8. For the internal exhaust duct plug cover, use A-grade high-temperature resistant fireproof cloth to adapt to the high temperature when the tail nozzle is just stopped to increase its service life.
[0025] 9. The small plugging cover of the tail nozzle center pipe is equipped with an elastic tie-down rope to prevent it from falling off during use.
[0026] 10. Alignment marks are sprayed on each plug to facilitate alignment during installation, and warning flags are installed to remind maintenance personnel to remove the plug before flight to ensure aircraft safety.
[0027] 11. It has the advantages of high strength, light weight, good corrosion resistance, high impact resistance, good fatigue resistance, simple forming process, high forming efficiency and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0029] Figure 1 This is a three-dimensional diagram of the overall installation structure of the utility model from the first perspective.
[0030] Figure 2 This is a three-dimensional diagram of the overall installation structure of the utility model from the second viewing angle.
[0031] Figure 3 This is a three-dimensional diagram of the engine intake duct plugging cover from the first perspective of the utility model.
[0032] Figure 4 This is a three-dimensional diagram of the engine intake duct plugging cover from the second perspective of the utility model.
[0033] Figure 5 This is a three-dimensional diagram from the first perspective of the engine intake duct plugging cover installation structure of the utility model.
[0034] Figure 6 This is a three-dimensional diagram from the second perspective of the engine intake duct plugging cover installation structure of the utility model.
[0035] Figure 7 This is a three-dimensional diagram from the first perspective of the combined structure of the tail nozzle plugging cover and the internal exhaust port plugging cover of the utility model.
[0036] Figure 8 This is a three-dimensional diagram from a second perspective of the combined structure of the tail nozzle plugging cover and the internal exhaust port plugging cover of the utility model.
[0037] Fig. 9 This is a three-dimensional diagram from a third perspective of the combined structure of the tail nozzle plugging cover and the internal exhaust port plugging cover of the utility model.
[0038] Fig.10 This is a three-dimensional diagram from the first perspective of the tail engine left outer culvert exhaust port plug cover of the utility model.
[0039] Fig.11 This is a three-dimensional diagram from a second perspective of the left outer culvert exhaust port plugging cover of the tail engine of the utility model.
[0040] Fig.12 This is a three-dimensional diagram from the first perspective of the engine right outer duct exhaust port plug cover of the utility model.
[0041] Fig.13 This is a three-dimensional diagram from a second perspective of the engine right outer duct exhaust port plug cover of the utility model.
[0042] In the figure: handle 1, reinforcement rib structure 2, engine air intake duct plugging cover 3, warning flag 4, direction mark 5, sign 6, nylon line 7, soft sponge rubber sheet 8, outer canvas 9, engine air intake duct 10, tail cone handle 11, tail nozzle plugging cover 12, tail cone fireproof cloth layer 13, elastic mooring rope 14, inner exhaust port plugging cover 15, inner exhaust port plugging cover fireproof cloth layer 16, engine left outer culvert exhaust port 17, engine right outer culvert exhaust port 18, engine left outer culvert exhaust port plugging cover 19, engine right outer culvert exhaust port plugging cover 20, engine inner exhaust port 21, engine tail nozzle center pipe 22. DETAILED DESCRIPTION
[0043] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.
[0044] See also Figure 1-13 A composite plugging cover for a large turbofan aircraft engine includes an engine air intake plugging cover 3 for plugging the engine air intake duct 10; an engine left duct exhaust plugging cover 19 for plugging the engine left duct exhaust port 17; an engine right duct exhaust plugging cover 20 for plugging the engine right duct exhaust port 18; and an inner exhaust plugging cover 15 for plugging the engine inner exhaust port 21; the inner exhaust plugging cover 15 is used in conjunction with the tail nozzle plugging cover 12 for plugging the engine tail nozzle center tube 22. By adopting the above-mentioned composite plugging cover, the air intake duct and exhaust duct of the aircraft engine can be plugged, the reliability of the plugging is guaranteed, and the safety of the plugging is guaranteed. It is used to plug the aircraft engine air intake duct, outer duct exhaust port and inner duct exhaust port when the aircraft is parked on the ground to prevent foreign objects such as wind, sand, rain and snow from entering the engine.
[0045] Furthermore, a direction mark 5 for indicating the installation direction is provided at the center of the engine inlet duct plug cover 3, and a sign 6 is provided below the direction mark 5. Alignment marks are sprayed on each plug cover to facilitate alignment and correction during installation, and a warning flag is installed to remind the maintenance personnel to remove the plug cover before flight to ensure the safety of the aircraft.
[0046] Furthermore, the main structures of the engine air intake duct plugging cover 3, the engine left outer culvert exhaust port plugging cover 19, the engine right outer culvert exhaust port plugging cover 20, the inner culvert exhaust port plugging cover 15 and the tail nozzle plugging cover 12 are all made of carbon fiber mixed with glass fiber as the main material. Through the above materials, it fully utilizes the advantages of low quality and high strength of resin-based fiber reinforced composite materials, and the structure can be designed. Its weight ratio is more than 33% lighter than that of aluminum alloy, which can fully realize lightweight design and improve the comprehensive performance of the product.
[0047] Moreover, the cover structure of the plugging cover is formed by layering composite prepreg on a mold, making a vacuum bag, evacuating the bag, and putting the whole into a hot autoclave for heating, pressurizing and curing.
[0048] Furthermore, the engine intake duct plug cover 3, the engine left outer culvert exhaust port plug cover 19, the engine right outer culvert exhaust port plug cover 20, the inner exhaust port plug cover 15 and the tail nozzle plug cover 12 are all provided with a flange structure at the parts that are easy to contact with the engine. The flange structure includes an outer canvas 9 sewn at the edge by nylon thread 7, and the inner layer of the outer canvas 9 is provided with a soft sponge rubber plate 8 for support. The flange structure is used to limit the outer lip of the exhaust duct to prevent the plug cover from falling into the inverted cone exhaust duct due to excessive force or improper operation during assembly.
[0049] The outer canvas 9 and the soft sponge rubber plate 8 are used to protect the machine body structure from damage and ensure that the plug cover has a proper fit tightness when installed on the machine.
[0050] Furthermore, the main structures of the engine air intake duct plugging cover 3, the engine left outer duct exhaust port plugging cover 19, the engine right outer duct exhaust port plugging cover 20, the inner duct exhaust port plugging cover 15 and the tail nozzle plugging cover 12 are all provided with a raised reinforcing rib structure 2 to improve the overall strength.
[0051] Furthermore, handles 1 are fixed to the main structures of the engine air intake duct plugging cover 3, the engine left outer duct exhaust port plugging cover 19, the engine right outer duct exhaust port plugging cover 20 and the inner duct exhaust port plugging cover 15, respectively, and a warning flag 4 is hung on the handle 1.
[0052] Furthermore, the tail nozzle plugging cover 12 adopts a conical structure, a tail cone handle 11 is provided at the tail end of the conical structure, a tail cone fireproof cloth layer 13 for contacting the aircraft is provided on the conical surface of the conical structure, and the tail cone handle 11 is connected to the inner exhaust port plugging cover 15 through an elastic tie rope 14 to prevent it from falling off during use.
[0053] Further, the outer edge of the inner exhaust port plugging cover 15 is provided with an inner exhaust port plugging cover fireproof cloth layer 16 for contacting the aircraft, so as to adapt to the high temperature when the tail nozzle just stops to increase its service life.
[0054] Working process and principle of this utility model:
[0055] During specific use, the engine air intake duct 10 is blocked by adopting the engine air intake duct blocking cover 3; the engine left outer duct exhaust port 17 is blocked by adopting the engine left outer duct exhaust port blocking cover 19; the engine right outer duct exhaust port 18 is blocked by the engine right outer duct exhaust port blocking cover 20; the engine inner duct exhaust port 21 is blocked by the inner duct exhaust port blocking cover 15; the engine tail nozzle center pipe 22 is blocked by the tail nozzle blocking cover 12, thereby effectively preventing foreign objects such as wind, sand, rain and snow from entering the engine.
Claims
1. A composite plugging cover for a large turbofan aircraft engine, characterized in that: It comprises an engine air intake duct plugging cover (3) for plugging the engine air intake duct (10); Also included is an engine left outer culvert exhaust port plugging cover (19) for plugging the engine left outer culvert exhaust port (17); Also included is an engine right outer duct exhaust port plugging cover (20) for plugging the engine right outer duct exhaust port (18); Also included is an internal exhaust port plugging cover (15) for plugging the internal exhaust port (21) of the engine; The exhaust port plugging cover (15) is used in conjunction with a tail nozzle plugging cover (12) for plugging the engine tail nozzle center pipe (22).
2. According to claim 1, a composite plugging cover for a large turbofan aircraft engine is characterized in that: A direction mark (5) for indicating the installation direction is arranged at the central part of the engine air intake duct plugging cover (3), and a sign (6) is arranged below the direction mark (5).
3. According to claim 2, a composite plugging cover for a large turbofan aircraft engine is characterized in that: The engine air intake duct plugging cover (3), the engine left outer duct exhaust port plugging cover (19), the engine right outer duct exhaust port plugging cover (20), the inner duct exhaust port plugging cover (15) and the tail nozzle plugging cover (12) are all provided with a flanged structure at the parts that are easy to contact with the engine. The flanged structure includes an outer layer of canvas (9) sewn at the edge by nylon thread (7), and the inner layer of the outer layer of canvas (9) is provided with a soft sponge rubber plate (8) for support.
4. According to claim 2, a composite plugging cover for a large turbofan aircraft engine is characterized in that: The main structures of the engine air intake duct plugging cover (3), the engine left outer duct exhaust port plugging cover (19), the engine right outer duct exhaust port plugging cover (20), the inner duct exhaust port plugging cover (15) and the tail nozzle plugging cover (12) are all provided with a raised reinforcing rib structure (2).
5. According to claim 2, a composite plugging cover for a large turbofan aircraft engine is characterized in that: A handle (1) is fixed to the main structure of the engine air intake duct plugging cover (3), the engine left outer duct exhaust port plugging cover (19), the engine right outer duct exhaust port plugging cover (20) and the inner duct exhaust port plugging cover (15), and a warning flag (4) is hung on the handle (1).
6. A composite plugging cover for a large turbofan aircraft engine according to claim 2, characterized in that: The tail nozzle plugging cover (12) adopts a conical structure, a tail cone handle (11) is arranged at the tail end of the conical structure, a tail cone fireproof cloth layer (13) for contacting the aircraft is arranged on the conical surface of the conical structure, and the tail cone handle (11) is connected to the inner exhaust port plugging cover (15) through an elastic mooring rope (14).
7. A composite plugging cover for a large turbofan aircraft engine according to claim 6, characterized in that: The outer edge of the inner exhaust port plugging cover (15) is provided with an inner exhaust port plugging cover fireproof cloth layer (16) for contacting the aircraft.