Waste liquid collecting system for turboprop aircraft

Abstract

The invention discloses a waste liquid collecting system for a turboprop aircraft, and belongs to the field of aviation waste liquid collection, the waste liquid collecting system comprises an oil collecting tank, an oil drainage device, an exhaust device, a liquid level display device and a liquid drainage pipeline system, and the pipeline system is connected with the oil collecting tank and an engine; the oil drainage device is arranged at the bottom of the oil collecting tank and communicated with the outside of the fuselage, the liquid level display device penetrates through the aircraft skin to form an external visible window, and the exhaust device is communicated with the oil collecting tank. The method has the effects of improving the waste liquid collection efficiency and reducing the cost and the operation risk.

Description

Technical Field

[0001] This application relates to the field of aviation waste liquid collection technology, and in particular to a waste liquid collection system for turboprop aircraft. Background Technology

[0002] In the aviation field, turboprop aircraft are one of the most important types of aircraft. With the continuous development of aviation technology, turboprop aircraft play a crucial role in various fields such as transportation and tourism. Their excellent fuel economy and low-altitude performance make them irreplaceable in short-range transportation and some special flight missions. With the widespread application of turboprop aircraft, various internal systems are constantly being improved and optimized to ensure flight safety, reliability, and efficiency. In particular, the various systems related to aircraft maintenance and operational support are crucial for the long-term stable operation of the aircraft.

[0003] During the operation of turboprop aircraft, collecting the waste fluid generated is an essential task. Previously, the common method was to channel the waste oil produced by the engine through a rigid pipe made of a single material into a designated container and then periodically discharge it. This connection method was relatively simple and straightforward; however, discharging the waste fluid generally required opening the hatch and disassembling the oil collection box to achieve the desired liquid discharge.

[0004] However, the existing treatment methods have many shortcomings. The operation method of opening the hatch and disassembling the oil collection box to discharge the waste liquid is not only cumbersome and time-consuming, but also increases the workload and operational risks of maintenance personnel. Summary of the Invention

[0005] To improve waste liquid collection efficiency and reduce costs and operational risks, this application provides a waste liquid collection system for turboprop aircraft.

[0006] The waste liquid collection system for turboprop aircraft provided in this application adopts the following technical solution: A waste liquid collection system for a turboprop aircraft comprises an oil tank, an oil draining device, an exhaust device, a liquid level display device, and a drain pipeline system. The pipeline system is connected to the oil tank and the engine respectively. The oil draining device is located at the bottom of the oil tank and communicates with the outside of the fuselage. The liquid level display device is formed by penetrating the aircraft skin to form an external viewing window. The exhaust device is communicated with the oil tank.

[0007] By adopting the above technical solutions, the drain pipeline system connects the engine to the fuel tank, ensuring the accurate collection of waste oil such as lubricating oil and fuel residue, avoiding leakage risks. Simultaneously, the optimized pipeline layout reduces flow resistance and improves collection efficiency. The venting device balances the air pressure inside and outside the fuel tank, preventing backflow of waste oil or contaminants carried by external air into the tank due to pressure differences. The fuel level display device penetrates the aircraft skin to form an external viewing window, allowing ground staff or the flight crew to directly observe the fuel level in the tank without opening the hatch. The drain device allows personnel to safely empty the fuel tank on the ground, avoiding the need to open the hatch and disassemble the fuel collection box, simplifying maintenance procedures, effectively improving waste liquid collection efficiency, and reducing costs and operational risks.

[0008] Preferably, the drainage pipeline system includes a flexible corrugated pipe detachably connected to the engine end, and a rigid metal pipe connected to the fuselage fixed structure.

[0009] By adopting the above technical solutions, the engine generates high-frequency vibrations and displacements due to thermal expansion and contraction during operation. The flexible corrugated pipe, with its extensibility and fatigue resistance, can effectively absorb and compensate for these dynamic deformations, preventing the pipeline from cracking or leaking due to stress concentration. The rigid pipe section connected to the fixed structure of the fuselage provides rigid support, ensuring the stability of the overall pipeline layout and preventing damage to other components of the fuselage or shaking of the pipeline system due to engine vibration transmission.

[0010] Preferably, the flexible corrugated pipe adopts a segmented corrugated structure, and the metal rigid pipe is detachably connected to the machine body fixing bracket through a clamp assembly.

[0011] By adopting the above technical solution, the segmented corrugated structure divides the overall corrugated pipe into multiple independent corrugated segments. Each corrugated segment can independently absorb displacement caused by engine vibration or thermal expansion and contraction, avoiding stress concentration on a single corrugation and significantly improving fatigue life. The clamp assembly can be manually tightened or loosened to achieve quick connection and separation of the metal rigid pipe from the engine block bracket, significantly shortening engine maintenance piping or repair time.

[0012] Preferably, the exhaust device includes a vent pipe, with its two ends respectively located inside the oil collection tank and outside the oil collection tank. A dust filter is provided at the outlet end of the vent pipe, and the dust filter is sealed to the vent pipe port using a threaded tightening structure.

[0013] By adopting the above technical solutions, the vent pipe can effectively prevent the formation of a vacuum or overpressure in the oil collection tank, which would affect normal discharge, and the dust filter can prevent dust from entering through the vent pipe.

[0014] Preferably, the oil draining device includes a first output pipe and a second output pipe, both of which are connected to the oil collection tank. The first output pipe is used to drain sediment from the oil collection tank, and the second output pipe is used to drain liquid from the oil collection tank. A sediment draining valve is provided on the first output pipe, and a control valve is provided on the second output pipe. One end of the sediment draining valve and one end of the control valve both lead to the outside of the aircraft skin.

[0015] By adopting the above technical solution, one end of the sediment discharge valve and the control valve is connected to the outside of the aircraft skin. This allows staff to open the valves from outside the aircraft and discharge the waste liquid in the oil collection tank using tools, without opening the cabin door or disassembling the oil collection box. This improves efficiency and reduces costs.

[0016] Preferably, a float is provided inside the oil collection tank, and a support pipe is fixedly connected inside the oil collection tank. The float is fitted and slidably on the support pipe. A suction nozzle is provided on the lower end face of the float, and a filter screen is provided at the port of the suction nozzle. The second output pipe includes a telescopic pipe and a delivery pipe. A suction pump is provided inside the oil collection tank. One end of the telescopic pipe passes through the float and connects to the suction nozzle, and the other end passes through and is slidably sealed to the support pipe and connected to the input end of the suction pump. One end of the delivery pipe is connected to the output end of the suction pump, and the other end extends out of the aircraft skin. A groove is provided on the side wall of the support pipe. The control valve is electrically connected to the suction pump, and the opening and closing of the control valve controls the switching on and off of the suction pump.

[0017] By adopting the above technical solution, when the liquid level in the oil collection tank rises, the float rises under the action of buoyancy and remains floating on the liquid surface. The movement of the float causes the telescopic tube to extend and retract within the groove. During the oil draining operation, the control valve is opened, the suction pump is started, and the suction nozzle draws liquid from the liquid surface in the oil collection tank. The liquid is discharged outside the machine through the telescopic tube and the delivery pipe. As the liquid level drops, the float follows. The filter screen at the suction nozzle can isolate impurities in the liquid. Especially when the liquid is basically drained and the float descends above the sediment, the second output pipe empties. The operator judges that the liquid in the oil collection tank is empty by the sound of a small amount of liquid being discharged from the delivery pipe or the pipe being empty. The control valve can be closed, and the sediment discharge valve can be opened to discharge the sediment in the oil collection tank. The waste oil liquid and the sediment in the liquid are discharged in layers, achieving the effect of solid-liquid separation. While collecting waste liquid, the waste liquid is also initially filtered, reducing the workload of subsequent waste liquid treatment.

[0018] Preferably, a fixing block is fixedly installed inside the support tube, the telescopic tube passes through the fixing block, a connecting block is fixedly sleeved on the telescopic tube, a return spring is provided between the connecting block and the fixing block, and the return spring is sleeved on the telescopic tube.

[0019] By adopting the above technical solution, when the float moves down with the liquid level, the stretched telescopic tube is pulled into the support tube by the connecting block and the return spring, thereby preventing the telescopic tube from accumulating on the outside.

[0020] Preferably, a scraper is slidably connected to the inner wall of the bottom of the oil collection tank, and the two sides of the scraper are designed as drainage surfaces. A rotating component for driving the scraper to rotate is provided on the first output pipe.

[0021] By adopting the above technical solution, when discharging sediment, the operator can drive the scraper to rotate by rotating the component. The rotation of the scraper can push the sediment on the inner wall of the bottom of the oil collection tank, and under the action of the drainage surface, the sediment is lowered and guided to the first output pipe, which accelerates the discharge of sediment and reduces the residue of sediment in the oil collection tank.

[0022] Preferably, the driving assembly includes a connecting pipe and a rotating cylinder. The first output pipe is divided into an upper pipe and a lower pipe. The rotating cylinder is rotatably disposed between the upper pipe and the lower pipe. The connecting pipe is rotatably disposed inside the first output pipe and is tightly fitted and sealed with the inside of the first output pipe. The rotating cylinder is fixedly sleeved on the connecting pipe. The scraper is fixedly connected to the top end of the connecting pipe. Rotating rings are fixedly connected to both the upper and lower end faces of the rotating cylinder. The rotating rings are inserted into and rotate on the upper pipe and the lower pipe.

[0023] By adopting the above technical solution, the operator rotates the drum, which in turn drives the connecting pipe to rotate. The rotation of the connecting pipe causes the scraper to rotate. The insertion and rotation of the rotating ring, as well as the sealing fit between the connecting pipe and the inner wall of the first output pipe, can enhance the sealing performance between the drum and the first output pipe.

[0024] Preferably, the liquid level display device has a transparent window on a portion of the aircraft skin, the transparent window is located on one side wall of the oil tank, the float slides within the transparent window, the float is coated with a bright paint, and the transparent window is marked with scale lines.

[0025] By adopting the above technical solution, staff can observe the amount of liquid stored in the oil collection tank through a transparent window. The float is coated with a bright paint, which makes it easy for staff to see the position of the float and the corresponding scale line, thereby obtaining the amount of waste liquid collected in the oil collection tank.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The drain piping system connects the engine to the fuel tank, ensuring accurate collection of waste oil such as lubricating oil and fuel residue, avoiding leakage risks. Optimized piping layout reduces flow resistance and improves collection efficiency. The venting device balances the air pressure inside and outside the fuel tank, preventing backflow of waste oil or contaminants carried by outside air into the tank due to pressure differences. A window penetrating the aircraft skin provides an external view, allowing ground staff or the flight crew to directly observe the fuel tank level without opening the hatch. The drain device allows personnel to safely empty the fuel tank on the ground, eliminating the need to open the hatch and disassemble the fuel collection box, simplifying maintenance procedures, effectively improving waste fluid collection efficiency, and reducing costs and operational risks. During engine operation, high-frequency vibrations and displacements caused by thermal expansion and contraction occur. Flexible bellows, with their stretchable and fatigue-resistant properties, can effectively absorb and compensate for these dynamic deformations, preventing pipeline cracking or leakage due to stress concentration. The rigid pipe section connected to the fixed structure of the fuselage provides rigid support, ensuring the stability of the overall pipeline layout and preventing damage to other components of the fuselage or shaking of the pipeline system due to engine vibration transmission. The vent pipe can effectively prevent the formation of a vacuum or overpressure in the oil collection tank, which would affect normal discharge, and the dust filter can prevent dust from entering through the vent pipe. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a waste liquid collection system for turboprop aircraft.

[0028] Figure 2 This is a schematic diagram of the exaggerated structure in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram of the structure of the telescopic tube in the embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the structure of the prominent rotating component in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures: 1. Oil collection tank; 2. Oil discharge device; 3. Liquid level display device; 4. Drainage pipeline system; 5. Flexible corrugated pipe; 6. Metal rigid pipe; 7. Clamp assembly; 8. Vent pipe; 9. Dust filter; 10. First output pipe; 11. Second output pipe; 12. Sediment discharge valve; 13. Control valve; 14. Float; 15. Support pipe; 16. Suction nozzle; 17. Filter screen; 18. Telescopic pipe; 19. Conveying pipe; 20. Fixing block; 21. Connecting block; 22. Return spring; 23. Scraper; 24. Drainage surface; 25. Rotating assembly; 26. Connecting pipe; 27. Rotating drum; 28. Upper pipe; 29. ​​Lower pipe; 30. Rotating ring; 32. Placement trough; 33. Inclined surface; 34. Suction pump; 35. Groove; 36. Perforation. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0033] like Figure 1 As shown in the figure, this application discloses a waste liquid collection system for turboprop aircraft, which includes an oil tank 1, an oil draining device 2, an exhaust device, a liquid level display device 3, and a drain pipeline system 4. The drain pipeline system 4 is connected to the oil tank 1 and the engine respectively. The oil draining device 2 is located at the bottom of the oil tank 1 and is connected to the outside of the fuselage. The liquid level display device 3 penetrates the aircraft skin to form an external viewing window. The exhaust device is connected to the oil tank 1.

[0034] like Figure 1 and Figure 2 As shown, the exhaust device includes a vent pipe 8, with its two ends located inside and outside the oil collection tank 1, respectively. A dust filter 9 is installed at the outlet end of the vent pipe 8, and the dust filter 9 is sealed to the port of the vent pipe 8 using a threaded tightening structure. The vent pipe 8 can balance the air pressure inside and outside the oil collection tank 1, preventing waste oil from flowing back due to pressure difference, while the dust filter 9 can prevent external air from carrying pollutants into the oil tank.

[0035] like Figure 1 As shown, the drain pipe system 4 connects the engine to the fuel tank 1, ensuring the precise collection of waste oil such as lubricating oil and fuel residue. The drain pipe system 4 includes a flexible corrugated pipe 5 detachably connected to the engine end and a rigid metal pipe 6 connected to the engine body's fixed structure. The flexible corrugated pipe 5 and the rigid metal pipe 6 are interconnected. The flexible corrugated pipe 5 adopts a segmented corrugated structure, and the rigid metal pipe 6 is detachably connected to the engine body's fixed bracket via a clamp assembly 7. Waste liquid generated by multiple drain devices inside the engine flows into the fuel tank 1 after converging through the pipes. During engine operation, high-frequency vibrations and displacements caused by thermal expansion and contraction are generated. The flexible corrugated pipe 5, with its extensibility and fatigue resistance, can effectively absorb and compensate for these dynamic deformations, preventing the pipes from cracking or leaking due to stress concentration. The segmented corrugated structure divides the entire bellows into multiple independent corrugated segments. Each corrugated segment can independently absorb displacement caused by engine vibration or thermal expansion and contraction, avoiding stress concentration on a single corrugation and significantly improving fatigue life. Adjacent corrugated segments can be detachably connected. If a segment is damaged, that segment of the bellows can be replaced separately without scrapping the entire pipe, reducing maintenance costs and time.

[0036] like Figure 1As shown, the metal rigid pipe 6 is connected to the fixed structure of the engine body through the clamp assembly 7. The clamp assembly 7 can be a clamp structure. The metal rigid pipe 6 is fixed by screws and other tools, which fixes the metal rigid pipe 6 to the inside of the engine, provides rigid support for the drain pipeline system 4, ensures the stability of the overall pipeline layout, and prevents damage to other parts of the engine body or shaking of the pipeline system due to engine vibration transmission.

[0037] like Figure 2 As shown, the oil discharge device 2 includes a first output pipe 10 and a second output pipe 11. The first output pipe 10 is connected to the oil collection tank 1 and is equipped with a sediment discharge valve 12 for discharging sediment from the oil collection tank 1. The second output pipe 11 is connected to the oil collection tank 1 and is equipped with a control valve 13 for discharging liquid from the oil collection tank 1. The waste oil collected in the oil collection tank 1 is separated into solid and liquid phases through the first output pipe 10 and the second output pipe 11 and then discharged separately. This completes the initial filtration of the waste oil, separating the liquid (with solid particles removed) and sediment for separate collection and discharge. The sediment is then discharged separately and enters different processing systems, accelerating the treatment of the waste oil. One end of the sediment discharge valve 12 and one end of the control valve 13 both lead to the outside of the aircraft skin. This allows personnel to open the valves from outside the aircraft without opening the cabin door or disassembling the oil collection tank, thus improving efficiency and reducing costs.

[0038] like Figure 2 and Figure 3 As shown, a float 14 is installed inside the oil collection tank 1. A placement groove 32 is opened on the inner wall of the oil collection tank 1, and a support pipe 15 is fixedly connected inside the placement groove 32. An inclined surface 33 is provided at the bottom of the placement groove 32, and the bottom of the support pipe 15 is sealed through the inclined surface 33. The float 14 is sleeved on and slides along the extension direction of the support pipe 15. A suction nozzle 16 is provided on the lower end face of the float 14, and a filter screen 17 is provided at the outer port of the suction nozzle 16. The filter screen 17 is used to isolate solid particles of waste oil. The second output pipe 11 includes a telescopic pipe 18 and a conveying pipe 19, and a suction pump 34 is installed in the bottom of the oil collection tank 1. A groove 35 is formed on the side wall of the support tube 15 near the float 14 along its extension direction. A through hole is formed at the lower center of the groove 35. One end of the telescopic tube 18 passes through the float 14 and connects to the suction nozzle 16, while the other end passes through the through hole and enters the support tube 15, connecting to the input end of the suction pump 34. Sealing elements are provided at both ends of the through hole, and the telescopic tube 18 slides and seals within the through hole to prevent liquid from entering the support tube 15.

[0039] like Figure 2 and Figure 3As shown, the delivery pipe 19 connects to the output end of the suction pump 34 and extends through the machine body to the outside. The control valve 13 is electrically connected to the suction pump 34; opening the control valve 13 starts the suction pump 34, and closing the control valve 13 shuts off the suction pump 34. A fixing block 20 is fixedly installed inside the support pipe 15. The peripheral walls of the fixing block 20 are fixedly welded to the inner wall of the support pipe without gaps. The fixing block 20 is located in the lower middle part of the support pipe 15. The telescopic pipe 18 passes through the fixing block 20 near the suction pump 34, and the connection is sealed to enhance the sealing performance. A connecting block 21 is fixedly sleeved on the telescopic pipe 18. The connecting diameter is smaller than the inner diameter of the support pipe 15. A return spring 22 is provided between the connecting block 21 and the fixing block 20, and the return spring 22 is sleeved on the telescopic pipe 18.

[0040] like Figure 2 and Figure 3 As shown, when the liquid level in the oil collection tank 1 rises, the float 14 rises under the action of buoyancy. The movement of the float 14 pulls the telescopic tube 18, which is stretched. As the liquid level continues to rise, the telescopic tube 18, which was originally inside the support tube 15, is stretched outward. The movement of the connecting block 21 causes the return spring 22 to stretch. During the oil discharge operation, the operator opens the control valve 13, starts the suction pump 34, and the suction nozzle 16 draws liquid from the liquid level in the oil collection tank 1. The liquid is discharged outside the machine through the telescopic tube 18 and the delivery pipe 19. As the liquid level drops, the float 14 follows and the telescopic tube 18 follows. The return spring 22 pulls the connecting block 21 downward. The connecting block 21 moves the telescopic tube 18 downward and pulls the excess telescopic tube 18 outside the support tube 15 into the support tube 15, preventing the telescopic tube 18 from accumulating outside the support tube 15. The filter screen 17 at the suction nozzle 16 can isolate impurities in the liquid, preventing impurity particles from being discharged from the second output pipe 11. Especially when the liquid is almost completely drained, the float 14 descends above the sediment, and the filter screen 17 prevents the second output from sucking out the sediment. At this time, the second output pipe 11 will make a sound of emptying. The operator can judge that the liquid in the oil collection tank 1 is empty by the decrease or absence of liquid discharged from the outer port of the delivery pipe 19 or by the sound of an empty pipe in the second output pipe 11. At this time, the control valve 13 can be closed and the sediment discharge valve 12 can be opened to discharge the sediment in the oil collection tank 1.

[0041] like Figure 2 and Figure 4As shown, two scrapers 23 are slidably connected to the inner wall of the bottom of the oil collection tank 1. The two scrapers 23 are arranged opposite each other, and the opposite sides of the scrapers 23 are designed as drainage surfaces 24. The drainage surfaces 24 are inclined surfaces, and the cross-sectional width of the two scrapers 23 decreases from the farthest end to the closest end. When the scrapers 23 rotate, they can scrape up and accumulate the sediment on the inner wall of the bottom of the oil collection tank 1 and guide it to the first output pipe 10 through the drainage surfaces 24. The first output pipe 10 is provided with a rotating assembly 25 for driving the scrapers 23 to rotate. The driving assembly includes a connecting pipe 26 and a rotating cylinder 27. The connecting pipe 26 is coaxially arranged inside the first output pipe 10 and is tightly fitted to the inner wall of the first output pipe 10, so that the connection between the first output pipe 10 and the connecting pipe 26 is sealed. Both scrapers 23 are fixedly welded to the top of the connecting pipe 26. The first output pipe 10 is divided into an upper pipe 28 and a lower pipe 29. A rotating cylinder 27 is rotatably disposed between the upper pipe 28 and the lower pipe 29, and is fixedly sleeved on the outer wall of the connecting pipe 26. Rotating rings 30 are fixedly welded to both the upper and lower end faces of the rotating cylinder 27. The rotating rings 30 are inserted into and rotate on the abutting end faces of the upper pipe 28 and the lower pipe 29. The rotating cylinder 27 fits and rotates against the upper pipe 28 and the lower pipe 29, improving the sealing between the first output pipe 10 and the connecting pipe 26.

[0042] like Figure 2 and Figure 4 As shown, when the float 14 descends to its lowest point, it abuts against the inclined surface 33. At this time, the float is located above the scraper 23, so the position of the float 14 does not affect the rotation of the scraper 23. When discharging sediment, the sediment on the inclined surface 33 slides downward under the guidance of the inclined surface 33 and detaches from the inclined surface 33. For the sediment points on the bottom inner wall of the oil collection tank 1, the operator rotates the rotating drum 27. The rotation of the rotating drum 27 drives the connecting pipe 26 to rotate, which in turn causes the scraper 23 to rotate. The rotation of the scraper 23 can push the sediment on the bottom inner wall of the oil collection tank 1 and, under the action of the drainage surface 24, lower the sediment and guide it to the first output pipe 10, thereby accelerating the discharge of sediment and reducing the residue of sediment in the oil collection tank 1.

[0043] The oil collection tank 1 can be set as a cylinder. This shape of scraper 23 can clean the bottom to the maximum extent. The cuboid shape used in the attached drawings of this application can also clean the bottom sediment to a certain extent. The design scheme of this application can be improved according to the shape of the oil collection tank 1.

[0044] like Figure 1 and Figure 2As shown, the liquid level display device 3 is a transparent window partially installed on the aircraft skin. This transparent window extends to the outer wall of one side of the oil tank 1, where the outer wall is also transparent. Its position corresponds to the location of the support pipe 15, allowing the float 14 to slide within the transparent window. The surface of the float 14 is coated with a bright paint, and the transparent window is marked with graduation lines. This allows personnel to easily access the float 14 and obtain the liquid level in the oil tank 1. The graduation lines quantify the amount of waste oil stored in the oil tank 1, thus enabling a determination of whether waste oil should be discharged.

[0045] The implementation principle of this application embodiment is as follows: The drain pipeline system 4 connects the engine to the fuel tank 1, ensuring that waste oil such as lubricating oil and fuel residue are accurately collected, avoiding leakage risks. At the same time, the optimized pipeline layout can reduce flow resistance and improve collection efficiency. The exhaust device can balance the air pressure inside and outside the fuel tank 1, preventing waste oil backflow or external air carrying pollutants into the fuel tank due to pressure difference. The liquid level display device 3 penetrates the aircraft skin to form an external viewing window, allowing ground staff or crew to directly observe the liquid level of the fuel tank 1 without opening the cabin door. The drain device 2 allows staff to safely empty the fuel tank 1 on the ground, avoiding operations such as opening the cabin door and disassembling the fuel collection box, simplifying the maintenance process, effectively improving waste liquid collection efficiency, and reducing costs and operational risks.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waste liquid collection system for turboprop aircraft, characterized in that: It consists of an oil tank (1), an oil drain device (2), an exhaust device, a liquid level display device (3), and a drain pipeline system (4). The pipeline system is connected to the oil tank (1) and the engine respectively. The oil drain device (2) is located at the bottom of the oil tank (1) and is connected to the outside of the fuselage. The liquid level display device (3) is a window that penetrates the aircraft skin to form an external viewing window. The exhaust device is connected to the oil tank (1).

2. The waste liquid collection system for turboprop aircraft according to claim 1, characterized in that: The drainage pipeline system (4) includes a flexible corrugated pipe (5) detachably connected to the engine end, and a metal rigid pipe (6) connected to the fuselage fixed structure.

3. The waste liquid collection system for turboprop aircraft according to claim 2, characterized in that: The flexible corrugated pipe (5) adopts a segmented corrugated structure, and the metal rigid pipe (6) is detachably connected to the body fixing bracket through the clamp assembly (7).

4. The waste liquid collection system for turboprop aircraft according to claim 1, characterized in that: The exhaust device includes a vent pipe (8), with the two ends of the vent pipe (8) respectively located in the inner cavity of the oil collection tank (1) and the outer side of the oil collection tank (1). A dust filter (9) is provided at the outlet end of the vent pipe (8), and the dust filter (9) is sealed to the port of the vent pipe (8) by a threaded tightening structure.

5. A waste liquid collection system for turboprop aircraft according to claim 1, characterized in that: The oil draining device (2) includes a first output pipe (10) and a second output pipe (11). Both the first output pipe (10) and the second output pipe (11) are connected to the oil collection tank (1). The first output pipe (10) is used to drain the sediment in the oil collection tank (1), and the second output pipe (11) is used to drain the liquid in the oil collection tank (1). A sediment draining valve (12) is provided on the first output pipe (10), and a control valve (13) is provided on the second output pipe (11). One end of the sediment draining valve (12) and one end of the control valve (13) are both connected to the outside of the aircraft skin.

6. A waste liquid collection system for turboprop aircraft according to claim 5, characterized in that: A float (14) is provided inside the oil collection tank (1), and a support pipe (15) is fixedly connected inside the oil collection tank (1). The float (14) is sleeved and slides on the support pipe (15). A suction nozzle (16) is provided on the lower end face of the float (14), and a filter screen (17) is provided at the port of the suction nozzle (16). The second output pipe (11) includes a telescopic pipe (18) and a conveying pipe (19). A suction pump (34) is provided inside the oil collection tank (1), and one end of the telescopic pipe (18) passes through... The float (14) is connected to the suction nozzle (16), and the other end is inserted through and slidably sealed to the support tube (15) and connected to the input end of the suction pump (34). One end of the delivery tube (19) is connected to the output end of the suction pump (34), and the other end extends out of the aircraft skin. A groove (35) is provided on the side wall of the support tube (15). The control valve (13) is electrically connected to the suction pump (34), and the opening and closing of the control valve (13) controls the opening and closing of the suction pump (34).

7. A waste liquid collection system for turboprop aircraft according to claim 6, characterized in that: A fixing block (20) is fixedly installed inside the support tube (15), and the telescopic tube (18) passes through the fixing block (20). A connecting block (21) is fixedly sleeved on the telescopic tube (18), and a return spring (22) is provided between the connecting block (21) and the fixing block (20). The return spring (22) is sleeved on the telescopic tube (18).

8. A waste liquid collection system for turboprop aircraft according to claim 6, characterized in that: A scraper (23) is slidably connected to the inner wall of the bottom of the oil collection tank (1). The two sides of the scraper (23) are designed as drainage surfaces (24). A rotating assembly (25) for driving the scraper (23) to rotate is provided on the first output pipe (10).

9. A waste liquid collection system for a turboprop aircraft according to claim 8, characterized in that: The driving assembly includes a connecting pipe (26) and a rotating cylinder (27). The first output pipe (10) is divided into an upper pipe (28) and a lower pipe (29). The rotating cylinder (27) is rotatably disposed between the upper pipe (28) and the lower pipe (29). The connecting pipe (26) is rotatably disposed inside the first output pipe (10) and is tightly fitted and sealed with the inside of the first output pipe (10). The rotating cylinder (27) is fixedly sleeved on the connecting pipe (26). The scraper (23) is fixedly connected to the top end of the connecting pipe (26). Rotating rings (30) are fixedly connected to both the upper and lower end faces of the rotating cylinder (27). The rotating rings (30) are inserted into and rotate between the upper pipe (28) and the lower pipe (29).

10. A waste liquid collection system for a turboprop aircraft according to claim 6, characterized in that: The liquid level display device (3) has a transparent window on a part of the aircraft skin. The transparent window is set on one side wall of the oil tank (1). The float (14) slides in the transparent window. The float (14) is coated with bright paint. The transparent window is marked with scale lines.

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