An aero-engine oil flinger testing device and method

Abstract

The present application relates to the technical field of oil flinger test, in particular to an aero-engine oil flinger test device and method, which comprises a connecting drive shaft connected with a driving part and a connecting pipe shaft connected with a liquid supply part, and further comprises: a liquid storage box body which is a transparent conical structure and is detachably connected to one end of the connecting drive shaft; a flinger clamping cavity is formed in the center of the liquid storage box body for installing a flinger; a plurality of partitions are fixedly arranged in the liquid storage box body in the circumferential direction. The transparent conical liquid storage box body and the instant oil discharge structure are arranged, so that the sprayed oil liquid rapidly leaves the chamber and enters the pure oil bottle under the action of centrifugal force, avoiding the accumulation of oil liquid in the observation area, thereby providing a clear and unobstructed shooting field of view for the high-speed camera, synchronously acquiring the atomization characteristic parameters during the test, without the need for separate atomization test, and greatly improving the test efficiency and data correlation.

Description

Technical Field

[0001] This invention relates to the field of oil slinger testing technology, specifically to an oil slinger testing device and method for aero-engines. Background Technology

[0002] Fuel slingers are commonly used fuel injection devices in small and medium-sized aero engines, offering advantages such as low fuel supply pressure, stable atomization quality, good atomization at high altitudes, and simple structure. Their working principle is as follows: fuel enters the central shaft of the fuel slinger, is stretched into a thin film under centrifugal force, and is finally ejected from the injection holes, achieving atomization. The atomization effect directly affects the engine's combustion efficiency and combustion stability; therefore, testing the atomization characteristics of the fuel slinger (such as measuring parameters like the Sotter average diameter and atomization cone angle) is a crucial step in engine research and development and production.

[0003] In the prior art, patent CN118275105B discloses a test device and method for an aircraft engine oil slinger. A drive component rotates the oil slinger at high speed, while a liquid supply component continuously supplies liquid. Under centrifugal force, the liquid is thrown out from each injection hole and enters a sealed chamber of an accompanying liquid storage assembly. After the test, the liquid collected in each chamber is weighed to determine whether the injection volume of each injection hole is uniform. However, this device can only obtain data on the uniformity of the injection flow rate and cannot simultaneously detect the atomization effect of the oil (such as atomization cone angle, droplet size distribution, etc.). Although a transparent liquid storage box can be used to observe the atomization effect and a high-speed camera can be used for filming, the ejected oil continuously accumulates on the outside of the liquid storage box under centrifugal force, and the liquid level rises continuously with increasing rotation time, severely obstructing the high-speed camera's view and preventing the atomization process from being clearly and completely recorded. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a test device and method for an aero-engine oil slinger.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an aero-engine oil slinger test device, comprising a connecting drive shaft connected to a drive component and a connecting pipe shaft connected to a liquid supply component, and further comprising; The liquid storage box is a transparent, conical structure that is detachably connected to one end of the connecting drive shaft. A center cavity for holding the oil slinger is provided in the center of the liquid storage box for mounting the oil slinger. Multiple partitions are fixedly arranged circumferentially inside the liquid storage box, dividing the interior into multiple independent chambers, each corresponding to an oil injection hole of the oil slinger. A through hole is provided at the bottom of each chamber for communicating with the oil injection hole. The liquid storage mechanism includes a mounting bracket detachably connected to one side of the liquid storage box; the side wall of the mounting bracket has multiple guide holes, each guide hole corresponding to and communicating with a chamber; multiple pure oil bottles are arranged on the outer periphery of the mounting bracket, each pure oil bottle being connected to the mounting bracket via a mounting plate; a conical boss is provided on the side of the mounting plate facing the guide hole, a first conical hole is provided on the side wall of the guide hole, the conical boss can be inserted into the first conical hole, and a second conical hole is provided at the center of the conical boss; a self-closing valve is provided in the second conical hole.

[0006] Preferably, it also includes a dynamic balancing unit, comprising a connecting pipe that connects multiple pure oil bottles in pairs; a connector is connected to the bottom of each pure oil bottle, and a fastening sleeve is fitted on the outer wall of the connecting pipe, the fastening sleeve being connected to the connector; a piston is slidably arranged on the inner wall of each pure oil bottle, the piston having a hollow cavity inside, so that the overall density of the piston is the same as the density of the oil, and the side of the piston near the connecting pipe is filled with oil.

[0007] Preferably, the automatic shut-off valve includes a conical sealing plug disposed in the second conical hole, a baffle is disposed on one side of the conical sealing plug, and the baffle is threadedly connected to the second conical hole; a small hole is opened on the side wall of the baffle, and a spring is disposed between the baffle and the conical sealing plug.

[0008] Preferably, it further includes a counterweight adjustment ring, which is fixedly connected to the side wall of the mounting bracket. The side wall of the counterweight adjustment ring has an annular groove, and one side of the groove has a mounting groove. A counterweight block is provided in the groove, and the counterweight block is fixed to the inner wall of the groove by screws. The position of the counterweight block can be slidably adjusted after the screws are loosened.

[0009] Preferably, the liquid storage box is made of transparent polycarbonate or transparent glass.

[0010] Preferably, the pure oil bottles are arranged in pairs and connected by a connecting pipe, and the connecting pipe connects the side of the two pure oil bottles away from the center of rotation.

[0011] Preferably, a protruding rod is fixedly provided on the side of the baffle facing the conical sealing plug to limit the maximum displacement of the conical sealing plug.

[0012] A method for testing an oil slinger disc in an aircraft engine includes the following steps: a: Install the oil slinger into the oil slinger clamping cavity of the liquid storage box, so that each oil injection hole is connected to each through hole; connect the liquid storage mechanism to the liquid storage box, and fix the connecting pipe shaft to the mounting bracket; b: By adjusting the position of the counterweight in the counterweight adjusting ring groove, the entire device can achieve dynamic balance; c: Start the drive unit to rotate the liquid storage box, oil slinger, and liquid storage mechanism together to the preset speed; at the same time, the liquid supply unit supplies oil axially into the oil slinger through the connecting pipe. d: During rotation, the oil is sprayed out from the injection hole under the action of centrifugal force, enters the chamber through the through hole, and then enters the pure oil bottle through the guide hole and the self-closing valve that is in the open state; the external high-speed camera takes atomization images through the transparent liquid storage box to obtain atomization characteristic parameters; e: If the amount of oil sprayed from each nozzle is uniform, the volume of oil in each pure oil bottle will be similar; if the amount of oil sprayed from a certain nozzle is large, the oil pressure in the corresponding pure oil bottle will increase, pushing the piston to move and press the oil through the connecting pipe into another pure oil bottle connected to it, thus achieving dynamic mass balance. f: After the test, stop the drive components and the automatic shut-off valve will close automatically; disassemble each pure oil bottle, weigh the total oil mass of each pure oil bottle and its corresponding connected bottle, calculate the oil injection volume of each injection hole, and evaluate the atomization effect and oil injection uniformity of the oil slinger by combining the acquired atomization images.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by setting up a transparent conical liquid storage box and an instant oil discharge structure (guide hole, automatic shut-off valve, pure oil bottle), allows the sprayed oil to quickly leave the chamber and enter the pure oil bottle under the action of centrifugal force, avoiding the accumulation of oil in the observation area. This provides a clear and unobstructed shooting field of view for the high-speed camera, and allows the atomization characteristic parameters to be acquired simultaneously during the test, eliminating the need for separate atomization testing, and greatly improving test efficiency and data correlation.

[0014] 2. This invention connects two pure oil bottles and sets a piston with the same density as the oil inside each bottle. When the amount of oil sprayed from a certain oil spray hole is too large, the excess oil will be automatically transferred to the corresponding other pure oil bottle by the movement of the piston. This realizes real-time mass balance adjustment during the rotation process, effectively avoids dynamic imbalance vibration caused by uneven oil spraying, prevents equipment damage, and significantly improves the safety of high-speed rotation testing. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 for Figure 2 Enlarged structural diagram at point B; Figure 5 This is a three-dimensional structural diagram of the mounting bracket of the present invention; Figure 6 This is a three-dimensional structural diagram of the pure oil bottle of the present invention; Figure 7 This is a schematic cross-sectional view of the pure oil bottle of the present invention; Figure 8 This is a three-dimensional structural diagram of the liquid storage box of the present invention; Figure 9 This is a cross-sectional view of the mounting plate of the present invention.

[0016] In the diagram: 1. Connecting drive shaft; 2. Liquid storage box; 3. Oil slinger clamping cavity; 4. Oil slinger; 5. Oil injection hole; 6. Partition plate; 7. Chamber; 8. Through hole; 9. Mounting bracket; 10. Guide hole; 11. First conical hole; 12. Mounting plate; 13. Conical boss; 14. Second conical hole; 15. Automatic shut-off valve; 16. Connecting pipe shaft; 17. Pure oil bottle; 18. Connecting pipe; 19. Connector; 20. Fastening sleeve; 21. Piston; 22. Screw; 23. Counterweight adjusting ring; 24. Slot; 25. Counterweight block; 151. Conical sealing plug; 152. Spring; 153. Baffle; 154. Small hole; 155. Protruding rod. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Please see Figures 1 to 9 An aircraft engine oil slinger test device includes a connecting drive shaft 1 connected to a drive component and a connecting pipe shaft 16 connected to a liquid supply component. The liquid storage box 2 is a transparent conical structure that is detachably connected to one end of the drive shaft 1. The center of the liquid storage box 2 has an oil slinger clamping cavity 3 for installing the oil slinger 4. Multiple partitions 6 are fixedly arranged circumferentially inside the liquid storage box 2, dividing the inside of the liquid storage box 2 into multiple independent chambers 7. Each chamber 7 corresponds to an oil injection hole 5 of the oil slinger. The bottom of each chamber 7 has a through hole 8 for communicating with the oil injection hole 5. The liquid storage mechanism includes a mounting bracket 9 detachably connected to one side of the liquid storage box 2; the side wall of the mounting bracket 9 has multiple guide holes 10, which are connected to the chambers 7 one by one; multiple pure oil bottles 17 are arranged on the outer periphery of the mounting bracket 9, and each pure oil bottle 17 is connected to the mounting bracket 9 through a mounting plate 12; the mounting plate 12 has a conical boss 13 on the side facing the guide hole 10, the side wall of the guide hole 10 has a first conical hole 11, the conical boss 13 can be inserted into the first conical hole 11, and a second conical hole 14 is opened in the center of the conical boss 13; a shutdown self-closing valve 15 is arranged in the second conical hole 14.

[0019] As shown in the above structure, during testing, the drive component drives the liquid storage box 2 and the internal oil slinger 4 to rotate at high speed via the drive shaft 1. The liquid supply component supplies oil to the oil slinger 4 via the connecting pipe shaft 16. Under centrifugal force, the fuel is sprayed out through the injection hole 5 and enters the corresponding chamber 7 through the through hole 8. Since the liquid storage box 2 is made of transparent material, the external high-speed camera can observe the spraying process through the box. The oil entering the chamber 7 passes through the guide hole 10, the first conical hole 11, the second conical hole 14, and the automatic shut-off valve 15 before entering the pure oil bottle 17 for storage. The automatic shut-off valve 15 opens under centrifugal force during rotation and automatically closes when the machine stops to prevent oil backflow. The use of a transparent conical liquid storage box 2 combined with an instant oil discharge structure prevents oil from accumulating in the chamber 7, ensuring that the high-speed camera can capture the atomization effect of the oil slinger without obstruction, and simultaneously achieving simultaneous testing of the uniformity of oil spraying and atomization characteristics.

[0020] Furthermore, it also includes a dynamic balancing unit, comprising connecting pipes 18 that connect multiple pure oil bottles 17 in pairs; each pure oil bottle 17 has a connector 19 at its bottom, and a fastening sleeve 20 is fitted on the outer wall of the connecting pipe 18, with the fastening sleeve 20 connected to the connector 19; a piston 21 is slidably mounted on the inner wall of each pure oil bottle 17, and the piston 21 has a hollow cavity inside, making the overall density of the piston 21 the same as the density of the oil. The side of the piston 21 closest to the connecting pipe 18 is filled with oil; when the oil slinger 4 rotates and sprays oil, if the oil spray volume of a certain spray hole 5 is too large, the oil volume in the corresponding pure oil bottle 17 increases, the pressure rises, and the piston 21 is pushed to move away from the connecting pipe 18. The hollow interior of the piston 21 makes its density the same as the oil, allowing it to float in the oil. When piston 21 moves, the oil on the other side of piston 21 is pressed into another pure oil bottle 17 connected to the first pure oil bottle 17 through connecting pipe 18, thereby realizing the dynamic transfer of mass between the two pure oil bottle groups 17 and maintaining the dynamic balance of the rotating system.

[0021] Furthermore, the automatic shut-off valve 15 includes a conical sealing plug 151 disposed within the second conical bore 14. A baffle 153 is disposed on one side of the conical sealing plug 151 and is threadedly connected to the second conical bore 14. A small hole 154 is provided on the side wall of the baffle 153, and a spring 152 is disposed between the baffle 153 and the conical sealing plug 151. In the rotating state, centrifugal force acts on the conical sealing plug 151, causing it to overcome the elastic force of the spring 152 and move outward along the second conical bore 14, opening the oil passage. The small hole 154 on the baffle 153 allows oil to pass through. When the test stops and the speed drops to zero, the centrifugal force disappears, the spring 152 pushes the conical sealing plug 151 to reset, resealing the second conical bore 14 and preventing the oil in the pure oil bottle 17 from flowing back into the chamber 7 under gravity or residual pressure.

[0022] Furthermore, it also includes a counterweight adjustment ring 23, fixedly connected to the side wall of the mounting frame 9. The side wall of the counterweight adjustment ring 23 has an annular groove 24, and one side of the groove 24 has a mounting slot. A counterweight block 25 is disposed within the groove 24, and the counterweight block 25 is fixed to the inner wall of the groove 24 by screws 22. The position of the counterweight block 25 can be adjusted by sliding after loosening the screws 22. The counterweight adjustment ring 23 is fixed to the side wall of the mounting frame 9, and static and dynamic balance adjustments are performed by using the counterweight block 25 within the groove 24. After loosening the screws 22, the counterweight block 25 can slide along the annular groove 24 to change its circumferential position; tightening the screws 22 secures the counterweight block 25 against the inner wall of the groove 24. By adjusting the mass and position of the counterweight block 25, minor imbalances caused by manufacturing or assembly issues within the device itself are compensated.

[0023] Furthermore, the liquid storage box 2 is made of transparent polycarbonate or transparent glass. When the liquid storage box 2 is made of transparent polycarbonate or transparent glass, the light from the external light source and the high-speed camera can penetrate the box and directly illuminate the oil spray hole 5 and atomization area of ​​the oil slinger 4 during the rotation test, thereby clearly recording the dynamic processes such as droplet breakage and cone angle expansion.

[0024] Furthermore, the pure oil bottles 17 are grouped in pairs and connected by a connecting pipe 18, which connects the two pure oil bottles 17 to the side away from the center of rotation. The further away from the center of rotation, the greater the inertia during rotation, which is beneficial for mass transfer and dynamic equilibrium.

[0025] Furthermore, a protruding rod 155 is fixedly provided on the side of the baffle 153 facing the conical sealing plug 151 to limit the maximum displacement of the conical sealing plug 151; the protruding rod 155 is fixedly provided on the side of the baffle 153 facing the conical sealing plug 151. When the conical sealing plug 151 moves outward under the action of centrifugal force, its movement distance is limited by the end of the protruding rod 155, which prevents the spring 152 from being over-compressed and causing permanent deformation or damage, and at the same time prevents the conical sealing plug 151 from completely disengaging from the second conical hole 14 and becoming unable to reset.

[0026] In this invention, the oil slinger 4 is installed in the oil slinger clamping cavity 3 of the liquid storage box 2, so that each oil spray hole 5 is connected to each through hole 8; the liquid storage mechanism is connected to the liquid storage box 2, and the connecting pipe shaft 16 is fixed to the mounting bracket 9. By adjusting the position of the counterweight 25 in the slot 24 of the counterweight adjusting ring 23, the entire device can achieve dynamic balance. Start the drive unit to rotate the liquid storage box 2, the oil slinger 4 and the liquid storage mechanism together to the preset speed; at the same time, the liquid supply unit supplies oil to the oil slinger 4 through the connecting pipe shaft 16. During the rotation, the oil is sprayed out from the spray hole 5 under the action of centrifugal force, enters the chamber 7 through the through hole 8, and then enters the pure oil bottle 17 through the guide hole 10 and the self-closing valve 15 which is in the open state; the external high-speed camera captures the atomization image through the transparent liquid storage box 2 and obtains the atomization characteristic parameters. If the amount of oil sprayed from each of the oil spray holes 5 is uniform, the volume of oil in each pure oil bottle 17 will be similar; if the amount of oil sprayed from a certain oil spray hole 5 is large, the oil pressure in the corresponding pure oil bottle 17 will increase, pushing the piston 21 to move and press the oil through the connecting pipe 18 into another pure oil bottle 17 connected to it, thus achieving dynamic mass balance. After the test, the drive components are stopped and the automatic shut-off valve 15 closes automatically. Each pure oil bottle 17 is disassembled, and the total oil mass of each pure oil bottle and its corresponding connected bottle is weighed. The amount of oil injected through each injection hole 5 is calculated. Based on the acquired atomization images, the atomization effect and oil injection uniformity of the oil slinger are evaluated.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended technical solutions and their equivalents.

Claims

1. An aircraft engine oil slinger test device, comprising a connecting drive shaft (1) connected to a drive component and a connecting pipe shaft (16) connected to a liquid supply component, characterized in that, Also includes: The liquid storage box (2) is a transparent cone-shaped structure and is detachably connected to one end of the connecting drive shaft (1); the center of the liquid storage box (2) is provided with an oil slinger clamping cavity (3) for installing the oil slinger (4); multiple partitions (6) are fixedly arranged circumferentially inside the liquid storage box (2) to divide the inside of the liquid storage box (2) into multiple independent chambers (7), each chamber (7) corresponding to an oil spray hole (5) of the oil slinger; a through hole (8) is provided at the bottom of each chamber (7) for communicating with the oil spray hole (5); The liquid storage mechanism includes a mounting bracket (9) detachably connected to one side of the liquid storage box (2); the side wall of the mounting bracket (9) is provided with a plurality of guide holes (10), and the guide holes (10) are connected to the chamber (7) one by one; a plurality of pure oil bottles (17) are provided on the outer periphery of the mounting bracket (9), and each pure oil bottle (17) is connected to the mounting bracket (9) through a mounting plate (12); a conical boss (13) is provided on the side of the mounting plate (12) facing the guide hole (10), a first conical hole (11) is provided on the side wall of the guide hole (10), the conical boss (13) can be inserted into the first conical hole (11), and a second conical hole (14) is provided in the center of the conical boss (13); a shutdown self-closing valve (15) is provided in the second conical hole (14). The dynamic balancing unit includes a connecting pipe (18) that connects multiple pure oil bottles (17) in pairs; each pure oil bottle (17) has a connector (19) at its bottom, and a fastening sleeve (20) is fitted on the outer wall of the connecting pipe (18), and the fastening sleeve (20) is connected to the connector (19); a piston (21) is slidably arranged on the inner wall of each pure oil bottle (17), and the piston (21) has a hollow cavity inside, so that the overall density of the piston (21) is the same as the density of the oil, and the side of the piston (21) near the connecting pipe (18) is filled with oil.

2. The aircraft engine oil slinger testing device according to claim 1, characterized in that, The automatic shut-off valve (15) includes a cone sealing plug (151) disposed in the second cone hole (14), a baffle (153) is provided on one side of the cone sealing plug (151), the baffle (153) is threadedly connected to the second cone hole (14); a small hole (154) is opened on the side wall of the baffle (153), and a spring (152) is provided between the baffle (153) and the cone sealing plug (151).

3. The aircraft engine oil slinger testing device according to claim 1, characterized in that, It also includes a counterweight adjustment ring (23), which is fixedly connected to the side wall of the mounting bracket (9). The side wall of the counterweight adjustment ring (23) is provided with an annular groove (24), and a mounting groove is provided on one side of the groove (24). A counterweight block (25) is provided in the groove (24), and the counterweight block (25) is fixed to the inner wall of the groove (24) by screws (22). The position of the counterweight block (25) can be slidably adjusted after the screws (22) are loosened.

4. The aircraft engine oil slinger testing device according to claim 1, characterized in that, The liquid storage box (2) is made of transparent polycarbonate or transparent glass.

5. The aircraft engine oil slinger testing device according to claim 1, characterized in that, The pure oil bottles (17) are arranged in pairs and connected by a connecting pipe (18), and the connecting pipe (18) connects the two pure oil bottles (17) to the side away from the center of rotation.

6. The aircraft engine oil slinger testing device according to claim 2, characterized in that, The baffle (153) is fixedly provided with a protruding rod (155) on the side facing the cone sealing plug (151) to limit the maximum displacement of the cone sealing plug (151).

7. A method for testing an oil slinger disc of an aircraft engine, using the apparatus described in any one of claims 1 to 6, characterized in that, Includes the following steps: a: Install the oil slinger (4) in the oil slinger clamping cavity (3) of the liquid storage box (2) so that each oil injection hole (5) is connected to each through hole (8); connect the liquid storage mechanism to the liquid storage box (2) and fix the connecting pipe shaft (16) to the mounting bracket (9); b: By adjusting the position of the counterweight (25) in the slot (24) of the counterweight adjustment ring (23), the entire device can achieve dynamic balance; c: Start the drive unit to drive the liquid storage box (2), the oil slinger (4) and the liquid storage mechanism to rotate together to the preset speed; at the same time, the liquid supply unit supplies oil to the inside of the oil slinger (4) through the connecting pipe shaft (16); d: During the rotation, the oil is sprayed out from the spray hole (5) under the action of centrifugal force, enters the chamber (7) through the through hole (8), and then enters the pure oil bottle (17) through the guide hole (10) and the shutdown self-closing valve (15) which is in the open state; the external high-speed camera takes atomization images through the transparent liquid storage box (2) and obtains atomization characteristic parameters; e: If the amount of oil sprayed from each spray hole (5) is uniform, the volume of oil in each pure oil bottle (17) will be similar; if the amount of oil sprayed from a certain spray hole (5) is large, the oil pressure in the corresponding pure oil bottle (17) will increase, pushing the piston (21) to move and press the oil through the connecting pipe (18) into another pure oil bottle (17) connected to it, so as to achieve dynamic mass balance; f: After the test, stop the drive components and the shutdown valve (15) will automatically close; disassemble each pure oil bottle (17), weigh the total oil mass of each pure oil bottle and its corresponding connected bottle, calculate the amount of oil sprayed from each spray hole (5), and evaluate the atomization effect and oil spray uniformity of the oil slinger by combining the acquired atomization image.

Images