Standby air intake system for an aircraft engine

Abstract

This invention belongs to the field of aircraft engine technology, specifically disclosing a backup air intake system for an aircraft engine. The system includes an air pipe, a filter box fixedly connected to the outer wall of the air pipe, and a backup box fixedly installed at the bottom of the filter box. The filter box contains a first filter and a second filter. A sleeve is provided on one side of the first filter, and the sleeve is slidably connected inside the filter box. A filter assembly is used to filter the incoming air and replace clogged filters. The filter assembly is connected to the filter box, the backup box, the first filter, the sleeve, and the second filter. By setting up the filter assembly, filters can be automatically replaced after they become clogged, avoiding filter blockage that could affect the aircraft's air intake. After replacing a filter, partially clogged filters are used in conjunction with the new filter to filter the air, improving filter utilization, maximizing the dust-carrying capacity of each filter, and reducing the frequency of filter replacement.

Description

Technical Field

[0001] This invention belongs to the field of aircraft engine technology, and specifically relates to a backup air intake system for an aircraft engine. Background Technology

[0002] Aircraft engine backup air intake system generally refers to an auxiliary device used to supplement or replace air intake when the main air intake cannot meet the engine's needs. During low-speed flight or when the engine is operating at high power, the main air intake may not be able to provide sufficient airflow. At this time, the auxiliary air intake valve of the backup air intake system opens and works to introduce additional air from the fuselage side wall or other locations to ensure stable engine operation.

[0003] When an aircraft engine's backup air intake system is in operation, it draws in additional air from the outside. As the air passes through the backup air intake system, it is filtered by a filter to remove dust and other impurities, maintaining the cleanliness of the air entering the aircraft engine. However, in existing backup air intake systems, the filters cannot be automatically replaced after becoming clogged. Manual replacement by personnel is required after the aircraft completes its flight mission. This method is not only complex, but the clogged filters also affect the aircraft's air intake during flight. Therefore, designing a backup air intake system for aircraft engines to address these issues is a problem we currently need to solve. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a backup air intake system for aircraft engines.

[0005] To achieve the above objectives, the present invention provides a backup air intake system for an aircraft engine, including an air pipe, a filter box fixedly connected to the outer wall of the air pipe, a backup box fixedly installed at the bottom of the filter box, a first filter screen and a second filter screen being provided inside the filter box, a sleeve being provided on one side of the first filter screen, and the sleeve being slidably connected inside the filter box.

[0006] A filter assembly is used to filter the introduced air and replace clogged filter screens. The filter assembly is connected to the filter box, spare box, first filter screen, sleeve and second filter screen.

[0007] In the above technical solution, the filter assembly further includes a first spring, one end of which is fixedly installed inside the sleeve, and the other end of which is fixedly installed inside the filter box. A first steel wire rope is inserted into the filter box, one end of which is fixedly connected to the inside of the sleeve. A push block is slidably connected inside the filter box.

[0008] In the above technical solution, a connecting sleeve is further fixedly installed inside the spare box. The first steel wire rope is inserted into the inside of the connecting sleeve. A second steel wire rope is inserted into the inside of the connecting sleeve. One end of the second steel wire rope is fixedly connected to the outer wall of the push block. The end of the first steel wire rope away from the sleeve is fixedly connected to a slider. A U-shaped sleeve is slidably connected to the outer wall of the slider. The U-shaped sleeve is fixedly installed inside the spare box.

[0009] In the above technical solution, further, an inclined plug is inserted inside the slider, and a counterweight is fixedly connected to the top of the inclined plug through the U-shaped sleeve. The counterweight is fixedly connected to the end of the second steel wire rope away from the push block. A second spring is fixedly installed on one side of the slider. The second spring is fixedly installed inside the U-shaped sleeve. A U-shaped rod is slidably connected inside the U-shaped sleeve. A connecting rod is fixedly connected to one end of the U-shaped rod. A replacement part is hinged to the outer wall of the connecting rod.

[0010] In the above technical solution, the outer wall of the replacement part is further fixedly connected with a top strip, the top of the top strip is provided with a limiting piece, the limiting piece is slidably connected inside the filter box, and the limiting piece is located on one side of the first filter screen.

[0011] In the above technical solution, the spare box is further provided with a plurality of third filters inside, one of which is located on top of the replacement part, and a support frame is provided at the bottom of the plurality of third filters. A third spring is fixedly installed on one side of the support frame and abuts against one side of the door of the spare box. A guide is fixedly installed at the bottom of the inner wall of the spare box and the guide is located at the bottom of the second filter.

[0012] In the above technical solution, a connecting block is fixedly installed on the outer wall of the first steel wire rope, a third steel wire rope is fixedly connected to the outer wall of the connecting block, a rotating sleeve is fixedly connected to the end of the third steel wire rope away from the connecting block, the rotating sleeve is rotatably connected to the inside of the filter box, a torsion spring is fixedly connected to the outer wall of the rotating sleeve, and the torsion spring is fixedly connected to the inside of the filter box.

[0013] In the above technical solution, the inner wall of the rotating sleeve is further provided with a pawl, and one side of the pawl is fixedly connected with an elastic piece. The elastic piece abuts against the inner wall of the rotating sleeve. A ratchet is inserted into the inside of the rotating sleeve, and one side of the ratchet is fixedly connected with a rotating component. The rotating component is rotatably connected inside the filter box and is located on one side of the second filter screen.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By setting up a filter assembly, the filter can be automatically replaced when it becomes clogged, preventing filter blockage from affecting the aircraft's air intake. After the filter is replaced, the partially clogged filter is used in conjunction with the new filter to filter the air, improving the utilization rate of the filter, maximizing the dust-carrying capacity of each filter, and reducing the frequency of filter replacement. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure proposed in this invention;

[0017] Figure 2 This is a first-view structural cross-sectional view of the filtering component proposed in this invention;

[0018] Figure 3 The present invention proposes Figure 2 Enlarged view of the A-section structure;

[0019] Figure 4 This is a cross-sectional view of the second-view structure of the filtering component proposed in this invention;

[0020] Figure 5 The present invention proposes Figure 4 Enlarged view of the structure of section B;

[0021] Figure 6 The present invention proposes Figure 4 Enlarged view of the C-section structure.

[0022] In the diagram: 1. Air tube; 2. Filter box; 3. Spare box; 4. First filter screen; 5. Sleeve; 6. Second filter screen; 7. First spring; 8. First steel wire rope; 9. Push block; 10. Connecting sleeve; 11. Second steel wire rope; 13. Sliding block; 14. U-shaped sleeve; 15. Inclined insert; 16. Counterweight; 17. Second spring; 18. U-shaped rod; 19. Connecting rod; 20. Replacement part; 21. Top bar; 22. Limiting plate; 23. Third filter screen; 24. Support frame; 25. Third spring; 26. Guide component; 27. Connecting block; 28. Third steel wire rope; 29. ​​Rotating sleeve; 30. Torsion spring; 31. Pawl; 32. Elastic plate; 33. Ratchet; 34. Rotating component. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1 to 6The diagram shows a backup air intake system for an aircraft engine, including an air pipe 1. The two ends of the air pipe 1 are fixedly connected to the auxiliary air intake of the aircraft and the aircraft engine (not shown). A filter box 2 is fixedly connected to the outer wall of the air pipe 1. A backup box 3 is fixedly installed at the bottom of the filter box 2. The filter box 2 is provided with a first filter screen 4 and a second filter screen 6. A sleeve 5 is provided on one side of the first filter screen 4. The sleeve 5 is slidably connected to the inside of the filter box 2.

[0025] The filter assembly is used to filter the incoming air and replace the clogged filter screen. The filter assembly is connected to the filter box 2, the spare box 3, the first filter screen 4, the sleeve 5, and the second filter screen 6.

[0026] The filter assembly includes a first spring 7, one end of which is fixedly installed inside the sleeve 5, and the other end of which is fixedly installed inside the filter box 2. A first steel wire rope 8 is inserted into the filter box 2, one end of which is fixedly connected to the inside of the sleeve 5. A push block 9 is slidably connected inside the filter box 2. A connecting sleeve 10 is fixedly installed inside the spare box 3, and the first steel wire rope 8 is inserted into the connecting sleeve 10. A second steel wire rope 11 is inserted into the connecting sleeve 10, one end of which is fixedly connected to the outer wall of the push block 9. A slider 1 is fixedly connected to the end of the first steel wire rope 8 away from the sleeve 5. 3. A U-shaped sleeve 14 is slidably connected to the outer wall of slider 13. The U-shaped sleeve 14 is fixedly installed inside the spare box 3. An inclined insert 15 is inserted into the inside of slider 13. A counterweight 16 is fixedly connected to the top of the inclined insert 15 through the U-shaped sleeve 14. The counterweight 16 is fixedly connected to the end of the second steel wire rope 11 away from the push block 9. A second spring 17 is fixedly installed on one side of slider 13. The second spring 17 is fixedly installed inside the U-shaped sleeve 14. A U-shaped rod 18 is slidably connected inside the U-shaped sleeve 14. A connecting rod 19 is fixedly connected to one end of the U-shaped rod 18. A replacement part 20 is hinged to the outer wall of the connecting rod 19. A top is fixedly connected to the outer wall of the replacement part 20. The top of the top bar 21 is provided with a limiting piece 22, which is slidably connected to the inside of the filter box 2. The limiting piece 22 is located on one side of the first filter screen 4. The spare box 3 is provided with multiple third filters 23, one of which is located on the top of the replacement part 20. The bottom of the multiple third filters 23 is provided with a support frame 24. A third spring 25 is fixedly installed on one side of the support frame 24 and abuts against the door side of the spare box 3. A guide 26 is fixedly installed on the bottom of the inner wall of the spare box 3. The guide 26 is located at the bottom of the second filter screen 6. A connecting block 27 is fixedly installed on the outer wall of the first steel wire rope 8. A third steel wire rope 28 is fixedly connected to the outer wall of the filter box 2. A rotating sleeve 29 is fixedly connected to the end of the third steel wire rope 28 away from the connecting block 27. The rotating sleeve 29 is rotatably connected to the inside of the filter box 2. A torsion spring 30 is fixedly connected to the outer wall of the rotating sleeve 29. The torsion spring 30 is fixedly connected to the inside of the filter box 2. A pawl 31 is rotatably connected to the inner wall of the rotating sleeve 29. An elastic piece 32 is fixedly connected to one side of the pawl 31. The elastic piece 32 abuts against the inner wall of the rotating sleeve 29. A ratchet 33 is inserted into the inside of the rotating sleeve 29. A rotating part 34 is fixedly connected to one side of the ratchet 33. The rotating part 34 is rotatably connected to the inside of the filter box 2. The rotating part 34 is located on one side of the second filter screen 6.

[0027] Among them, by setting up a filter component, the air passing through the air duct 1 can be filtered, and the clogged filter screen can be automatically replaced to avoid filter screen blockage and affecting the aircraft's air intake.

[0028] Specifically, when the aircraft engine’s backup air intake system starts working, air will pass through the filter components inside the filter box 2 along the air pipe 1, so that the first filter 4 inside the filter box 2 filters the air, and the filtered air continues to be discharged into the aircraft engine through the air pipe 1, thus achieving the effect of air filtration.

[0029] Furthermore, as the first filter 4 gradually becomes clogged with dust, the resistance to airflow through it gradually increases, causing the air to push the first filter 4 to slide. This causes the first filter 4 to compress the first spring 7 via the sleeve 5, opening the sleeve 5 to the second filter 6. This allows some air to be filtered by the second filter 6 and discharged into the aircraft engine. When the first filter 4 is pushed by the air to the same plane as the second filter 6, it drives the sleeve 5 to press against the push block 9. This push block 9 pulls the second steel wire rope 11 inside the connecting sleeve 10, causing the second steel wire rope 11 to move. This, in turn, causes the second steel wire rope 11 to pull the tilting insert 15 through the counterweight 16. The slider 13 disengages from the interior, stopping the limiting and fixing of the slider 13. This allows the second spring 17 to push the slider 13 to slide along the interior of the U-shaped sleeve 14, and to compress the gas inside the U-shaped sleeve 14 to push the U-shaped rod 18 to move. The U-shaped rod 18 then pushes the replacement part 20 along the interior of the spare box 3 toward the filter box 2 via the connecting rod 19. This causes the replacement part 20 to bring an internal third filter 23 to the initial position of the first filter 4, filtering the air and achieving automatic filter replacement without manual replacement by personnel. This prevents the filter of the spare air intake system from becoming clogged during flight, which would affect the air intake volume.

[0030] During this process, the replacement part 20 will push the limiting piece 22 to slide through the top bar 21, so that the limiting piece 22 blocks the third filter 23 on the side that has reached the initial position of the first filter 4, and limits and fixes the third filter 23 until the first spring 7 pushes the sleeve 5 to reset, so that the sleeve 5 pushes the limiting piece 22 to reset and stops. At this time, the sleeve 5 pushes the limiting piece 22 to stop limiting the third filter 23, and the sleeve 5 limits the third filter 23.

[0031] During the process of slider 13 being pushed by the second spring 17, slider 13 pulls the first steel wire rope 8, causing the first steel wire rope 8 to pull the third steel wire rope 28 through the connecting block 27, which in turn causes the third steel wire rope 28 to pull the rotating sleeve 29 to rotate. The rotation of the rotating sleeve 29 will drive the torsion spring 30 to twist and store force. The rotation of the rotating sleeve 29 will drive the ratchet 33 to rotate 90 degrees through the pawl 31, allowing the ratchet 33 to push the second filter screen 6 into the interior of the spare box 3 through the rotating part 34. When the second filter screen 6 falls into the interior of the spare box 3, the second filter screen 6 will be pushed by the inclined surface on the guide part 26. The movement causes the second filter 6 to reach the bottom of the inner wall of the spare box 3, and the second filter 6 to be misaligned with the rotating part 34, so as to avoid the subsequent rotation of the rotating part 34 being blocked and jammed by the second filter 6. The rotating part 34 pushes the first filter 4 to the initial position of the second filter 6. After the first filter 4 separates from the sleeve 5, the sleeve 5 loses the pressure brought by the air passing through the first filter 4, so that the first spring 7 can push the sleeve 5 to reset. The reset of the sleeve 5 will push the limiting piece 22 to reset through the inclined surface of the limiting piece 22 and support and limit the third filter 23 in the initial position of the first filter 4.

[0032] Furthermore, during the process of the first spring 7 pushing the sleeve 5 to reset, the sleeve 5 will stop pressing the push block 9, causing the counterweight 16 to pull the push block 9 to reset via the second steel wire rope 11. This, in turn, causes the counterweight 16 to drive the inclined insert 15 to re-insert into the slider 13. During the process of the first spring 7 pushing the sleeve 5 to reset, the sleeve 5 will pull the first steel wire rope 8, causing the first steel wire rope 8 to pull the slider 13 and connecting block 27 to reset. The reset of the slider 13 will cause the inclined insert 15 to rise due to the pressure of the inclined surface until the slider 13 is fully reset. After the inclined insert 15 aligns with the corresponding hole at the top of the slider 13, the inclined insert 15 can be inserted into the slider 13 under the weight of the counterweight 16, limiting the slider 13. The reset of the slider 13 will compress the second spring 17 to contract and... Negative pressure drives the U-shaped rod 18 to reset, causing it to re-enter the U-shaped sleeve 14 and drive the replacement part 20 to reset via the connecting rod 19. This stops the top bar 21 on the replacement part 20 from pushing the limiting plate 22, allowing the sleeve 5 to push the limiting plate 22 to reset. The third spring 25 can then push one of the remaining third filter screens 23 to the top of the reset replacement part 20 via the support frame 24. The resetting of the connecting block 27 stops the pulling of the third steel wire rope 28, causing the third steel wire rope 28 to stop pulling the rotating sleeve 29. This causes the torsion spring 30 to twist and drive the rotating sleeve 29 to reset. At this point, the entire filter assembly has been reset and returned to its initial state. Once the third filter screen 23, which has reached the initial position of the first filter screen 4, is clogged, the above steps are repeated to achieve continuous filter replacement.

[0033] Working principle: When the backup air intake system is working, the air pipe 1 discharges air into the filter assembly inside the filter box 2 for filtration. The first filter 4 filters the air. When the first filter 4 becomes clogged to a certain extent, the second filter 6 is opened by pressure difference, so that the first filter 4 and the second filter 6 work together to filter the air. When the first filter 4 becomes further clogged, causing the first filter 4 and the second filter 6 to be unable to reach the set air intake volume, the filter assembly automatically replaces the filters. The third filter 23 is moved to the initial position of the first filter 4, and the first filter 4 is moved to the initial position of the second filter 6. The second filter 6 is then put into the backup box 3. At this time, the third filter 23 is the first filter 4 of the previous cycle, and the first filter 4 is the second filter 6 of the previous cycle. Then the third filter 23 and the first filter 4 repeat the above steps to improve the utilization rate of the filters, maximize the dust carrying capacity of each filter, and reduce the frequency of filter replacement.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A backup air intake system for an aircraft engine, comprising an air pipe (1), characterized in that, The outer wall of the trachea (1) is fixedly connected to a filter box (2), and a spare box (3) is fixedly installed at the bottom of the filter box (2). The filter box (2) is provided with a first filter screen (4) and a second filter screen (6). A sleeve (5) is provided on one side of the first filter screen (4), and the sleeve (5) is slidably connected to the inside of the filter box (2). The filter assembly is used to filter the introduced air and replace the clogged filter screen. The filter assembly is connected to the filter box (2), the spare box (3), the first filter screen (4), the sleeve (5), and the second filter screen (6).

2. The backup air intake system for an aircraft engine according to claim 1, characterized in that, The filter assembly includes a first spring (7), one end of which is fixedly installed inside the sleeve (5), and the other end of which is fixedly installed away from the sleeve (5) inside the filter box (2). A first steel wire rope (8) is inserted into the filter box (2), one end of which is fixedly connected to the inside of the sleeve (5). A push block (9) is slidably connected inside the filter box (2).

3. The backup air intake system for an aircraft engine according to claim 2, characterized in that, The spare box (3) is fixedly installed with a connecting sleeve (10). The first steel wire rope (8) is inserted into the inside of the connecting sleeve (10). The second steel wire rope (11) is inserted into the inside of the connecting sleeve (10). One end of the second steel wire rope (11) is fixedly connected to the outer wall of the push block (9). The end of the first steel wire rope (8) away from the sleeve (5) is fixedly connected to a slider (13). The outer wall of the slider (13) is slidably connected to a U-shaped sleeve (14). The U-shaped sleeve (14) is fixedly installed inside the spare box (3).

4. A backup air intake system for an aircraft engine according to claim 3, characterized in that, An inclined plug (15) is inserted inside the slider (13). The top of the inclined plug (15) passes through the U-shaped sleeve (14) and is fixedly connected to a counterweight (16). The counterweight (16) is fixedly connected to the end of the second steel wire rope (11) away from the push block (9). A second spring (17) is fixedly installed on one side of the slider (13). The second spring (17) is fixedly installed inside the U-shaped sleeve (14). A U-shaped rod (18) is slidably connected inside the U-shaped sleeve (14). A connecting rod (19) is fixedly connected to one end of the U-shaped rod (18). A replacement part (20) is hinged to the outer wall of the connecting rod (19).

5. A backup air intake system for an aircraft engine according to claim 4, characterized in that, The outer wall of the replacement part (20) is fixedly connected to a top strip (21), and a limiting piece (22) is provided at the top of the top strip (21). The limiting piece (22) is slidably connected inside the filter box (2), and the limiting piece (22) is located on one side of the first filter screen (4).

6. A backup air intake system for an aircraft engine according to claim 4, characterized in that, The spare box (3) is provided with a plurality of third filters (23), one of which is located on the top of the replacement part (20). The bottom of the plurality of third filters (23) is provided with a support frame (24). A third spring (25) is fixedly installed on one side of the support frame (24). The third spring (25) abuts against the side of the door of the spare box (3). A guide (26) is fixedly installed on the bottom of the inner wall of the spare box (3). The guide (26) is located at the bottom of the second filter (6).

7. A backup air intake system for an aircraft engine according to claim 2, characterized in that, A connecting block (27) is fixedly installed on the outer wall of the first steel wire rope (8). A third steel wire rope (28) is fixedly connected to the outer wall of the connecting block (27). A rotating sleeve (29) is fixedly connected to the end of the third steel wire rope (28) away from the connecting block (27). The rotating sleeve (29) is rotatably connected to the inside of the filter box (2). A torsion spring (30) is fixedly connected to the outer wall of the rotating sleeve (29). The torsion spring (30) is fixedly connected to the inside of the filter box (2).

8. A backup air intake system for an aircraft engine according to claim 7, characterized in that, The inner wall of the rotating sleeve (29) is rotatably connected to a pawl (31), and an elastic piece (32) is fixedly connected to one side of the pawl (31). The elastic piece (32) abuts against the inner wall of the rotating sleeve (29). A ratchet (33) is inserted into the inside of the rotating sleeve (29). A rotating component (34) is fixedly connected to one side of the ratchet (33). The rotating component (34) is rotatably connected to the inside of the filter box (2). The rotating component (34) is located on one side of the second filter screen (6).

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