Aerospace High-Speed Bearing Radial Ring Under-Lubrication Oil Collection Characteristic Test Bench and Testing Method

Abstract

This application relates to an experimental platform and a testing method for the radial ring under-lubrication oil collection characteristics of an aviation high-speed bearing. The experimental platform includes an oil supply system, an experimental system, an oil return system, a testing system, and a photographing system. This application aims at the problems that the internal structure of the bearing chamber of an aero-engine is complex, it is difficult to arrange measuring points, and it is impossible to accurately measure the oil collection amount and the oil collection efficiency. By installing a wedge-shaped non-contact oil baffle in the experimental chamber, the lubricating oil entering the bearing is completely separated from the lubricating oil not collected by the radial oil collection ring, effectively solving the problem of inaccurate measurement of the oil collection amount and the oil collection efficiency caused by oil leakage, and can provide data support for the analysis of the radial ring under-lubrication oil collection performance and the structural optimization design of high-speed rolling bearings of aero-engines.

Description

Technical Field

[0001] This application relates to the technical field of under-ring oil supply lubrication for rolling bearing rings. Specifically, it relates to an experimental bench and testing method for the radial under-ring lubrication oil collection characteristics of an aviation high-speed bearing. Background Art

[0002] An aviation gas turbine engine is a high-speed rotating thermal machine. Its main shaft high-speed rolling bearing needs to face a high-temperature working environment while operating under high-speed and high-load conditions. To ensure the stable operation of the bearing in an almost harsh working environment, it is required that the lubricating oil system provides an appropriate amount of clean lubricating oil for good lubrication and timely removes the heat generated by internal friction of the bearing.

[0003] For the main shaft bearings with a small DN value, a direct injection oil supply lubrication method with a relatively simple structure and easy adjustment is mostly used. However, when the main shaft bearing operates at a high speed, the atomization of the lubricating oil jet makes it difficult for the lubricating oil to enter the bearing interior, thereby resulting in poor lubrication and cooling effects in the contact area. Blindly increasing the lubricating oil supply amount on the one hand will rapidly increase the heat generated by oil agitation inside the bearing, which may be counterproductive; on the other hand, it will lead to an increase in the circulation volume of the lubricating oil system and an increase in the weight of each component, which also hinders the development of the lubricating oil system towards high efficiency and compactness. Under-ring oil supply lubrication is a highly potential way to solve the efficient lubrication and cooling of high-speed rolling bearings in high-performance aviation engines. Its working process includes four stages: oil injection, oil collection, oil transmission, and oil slinging. Due to the limitations of structural design and spatial position, it is also difficult for the oil collection ring in the under-ring lubrication structure to collect all the lubricating oil ejected by the oil supply nozzle into the bearing interior. However, on the premise that the flow capacity of the oil transmission channel is sufficient, the lubricating oil entering the oil collection ring can be all slung into the bearing interior. The high-speed rolling bearing adopting the under-ring oil supply lubrication method has no obvious speed limit and can effectively solve the problem of insufficient lubrication and cooling of high-speed rolling bearings in high-performance aviation engines. However, the under-ring lubrication system has a complex structure, especially the radial under-ring lubrication structure, and its oil collection characteristics are affected by multiple parameters. Therefore, it is necessary to carry out refined design to ensure as high an oil collection efficiency as possible.

[0004] The under-ring lubrication oil collection experiment is an important method to accurately and efficiently obtain the variation law of the oil collection performance of the radial oil collection ring. Conducting the oil collection experiment can not only quantitatively obtain the oil collection amount and oil collection efficiency of the oil collection ring, but also qualitatively understand the complex flow phenomenon of the interaction between the radial oil collection ring and the lubricating oil jet through visualization technology. However, due to problems such as the complex structure of the under-ring lubrication system and the difficulty in accurately regulating parameters, at present, it is difficult to carry out accurate oil collection experiments on the radial under-ring lubrication structure of high-speed rolling bearings in aviation engines. Summary of the Invention

[0005] To overcome at least one deficiency in the prior art, the present application provides an experimental platform and a testing method for the lubricating oil collection characteristics under the radial ring of an aviation high-speed bearing.

[0006] In a first aspect, an experimental platform for the lubricating oil collection characteristics under the radial ring of an aviation high-speed bearing is provided, which includes an oil supply system, an experimental system, an oil return system, a testing system, and a photographing system.

[0007] The oil supply system is used to transport lubricating oil to the experimental system.

[0008] The experimental system is used to conduct lubricating oil collection experiments, and the experimental system includes a radial oil collection ring.

[0009] The testing system is used to obtain the oil return mass and the oil supply mass flow rate, and the oil return mass and the oil supply mass flow rate are used to determine the oil collection efficiency of the radial oil collection ring.

[0010] The photographing system is used to obtain the fragmentation and splash images of the lubricating oil jet in the experimental system.

[0011] The oil return system is used to transport the lubricating oil in the experimental system back to the oil supply system after the lubricating oil collection experiment ends.

[0012] In one embodiment, the oil supply system includes an oil tank and an oil supply pipeline that is hermetically connected to the oil tank. An oil supply pump, an oil filter, an overflow valve, a pneumatic valve, and an oil supply nozzle are arranged on the oil supply pipeline. The oil supply nozzle extends deep into the experimental system and sprays the lubricating oil into the experimental system.

[0013] In one embodiment, the experimental system includes an experimental chamber and a high-speed motor. A radial oil collection ring and a bearing inner ring are arranged in the experimental chamber. The high-speed motor, the radial oil collection ring, and the bearing inner ring are coaxially arranged. The high-speed motor is connected to the main shaft through a coupling, and the high-speed motor can drive the radial oil collection ring and the bearing inner ring to rotate synchronously at high speed through the main shaft. A return oil port is arranged at the bottom of the experimental chamber for the return oil in the experimental chamber to flow out.

[0014] In one embodiment, the experimental system further includes a V-block and an adjusting rod. The oil supply nozzle of the oil supply system is tightly fixed in the V-block by a setscrew, and the oil supply nozzle can move along its own axis direction to adjust the distance between the oil supply nozzle and the radial oil collection ring. The V-block and the adjusting rod are fixedly connected. When adjusting the adjusting rod, the spraying angle of the oil supply nozzle can be adjusted through the V-block.

[0015] In one embodiment, an oil retaining boss is arranged on the outer circle of the radial oil collection ring, and an oil retaining partition is arranged on the inner wall of the outer cover of the experimental chamber. The oil retaining boss and the oil retaining partition are close to each other but do not touch, and a radial micro-gap is formed between them. The oil retaining boss and the oil retaining partition divide the experimental chamber into a front chamber and a rear chamber. The lubricating oil collected by the radial oil collection ring enters the rear chamber through an oil pipeline, and the lubricating oil not collected by the radial oil collection ring enters the front chamber.

[0016] In one embodiment, the oil return port includes a front-side oil return port and a rear-side oil return port, which are respectively arranged at the bottom of the front cavity and the bottom of the rear cavity.

[0017] In one embodiment, the oil baffle is of a wedge-shaped structure. The inner width w1 of the oil baffle is not greater than the width w2 of the oil retaining boss. The outer width w3 of the wedge edge of the oil baffle is not less than the width of the oil retaining boss. The inner wedge angle α of the wedge edge is 30° - 35°, and the outer wedge angle β of the wedge edge is 135° - 155°.

[0018] In one embodiment, a strip-shaped groove is formed in the outer cover of the experimental cavity, and the oil supply nozzle of the oil supply system penetrates into the experimental cavity through the strip-shaped groove.

[0019] In one embodiment, the test system includes: an electronic scale and a mass flowmeter. The electronic scale is arranged below the experimental cavity of the experimental system and is used to obtain the oil return mass. The mass flowmeter is arranged on the oil supply pipeline of the oil supply system and is used to obtain the oil supply mass flow.

[0020] In one embodiment, the test system further includes: a first temperature sensor, a second temperature sensor, a third temperature sensor, a first pressure sensor, and a second pressure sensor. The first temperature sensor is arranged in the lubricating oil tank of the oil supply system. The second temperature sensor is arranged in front of the overflow valve of the oil supply system. The third temperature sensor is arranged in front of the oil supply nozzle of the oil supply system. The first pressure sensor is arranged in front of the overflow valve of the oil supply system. The second pressure sensor is arranged in front of the oil supply nozzle of the oil supply system.

[0021] In one embodiment, the oil return system includes: an oil collection measuring cup, an oil return pump, an oil filter, an oil-gas separator, and a radiator. The oil collection measuring cup is arranged below the experimental cavity of the experimental system. The lubricating oil flows from the oil return port of the experimental cavity to the oil collection measuring cup under the action of gravity. The oil return pump extracts the lubricating oil through a pipeline extending into the oil collection measuring cup and sequentially passes through the oil filter, the oil-gas separator, and the radiator, and then pumps the lubricating oil to the lubricating oil tank of the oil supply system.

[0022] In a second aspect, a method for testing the oil collection characteristics of the radial ring under lubrication of an aviation high-speed bearing is provided. Based on the above experimental bench, it includes:

[0023] Set the lubricating oil temperature, oil supply pressure, and oil supply temperature required in the experiment. Close the pneumatic valve of the oil supply system, start the oil supply pump to uniformly heat the lubricating oil to the set temperature; adjust the oil supply nozzle to the angle required for the experimental condition; seal the opening part of the strip-shaped groove of the experimental cavity with nano tape; set the frequency converter frequency according to the required experimental speed and then start the high-speed motor, and accelerate the high-speed motor to the set speed and then operate stably;

[0024] Open the pneumatic valve of the oil supply system to allow the lubricating oil to enter the experimental cavity through the oil supply nozzle;

[0025] After the lubricating oil flow rate flowing into the oil collection cup in the experimental chamber of the experimental system becomes stable, continuously collect and record the supply oil mass flow rate and the return oil mass within a time of not less than 30 s. At the same time, take and save the broken and splashed images of the lubricating oil jet according to the experimental requirements;

[0026] Stop the high-speed motor, close the pneumatic valve of the oil supply system to make the oil supply system start internal circulation; turn on the oil return pump, extend the pipeline into the oil collection cup to pump the lubricating oil back to the lubricating oil tank, after pumping, turn off the oil return pump, and zero the electronic scale;

[0027] Change the required experimental rotation speed, oil supply pressure and oil supply temperature, and repeat the above steps to complete the parameter measurement of other experimental conditions;

[0028] Perform time averaging on the return oil mass collected under different experimental conditions to calculate the time average value of the return oil mass; apply the least squares method to the time average value of the return oil mass to calculate the return oil mass flow rate, and compare the return oil mass flow rate with the supply oil mass flow rate. If the difference between the two is greater than 0.5%, check whether there is oil leakage in the experimental system or whether there is a malfunction in the test instrument. If the difference between the two is less than 0.5%, calculate the ratio of the return oil mass flow rate of the second electronic scale to the supply oil mass flow rate, which is the oil collection efficiency of the radial oil collection ring.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] (1) The present application aims at the problems that the internal structure of the bearing chamber of an aeroengine is complex, it is difficult to arrange measuring points, and it is impossible to accurately measure the oil collection amount and the oil collection efficiency. By installing a wedge-shaped non-contact oil baffle in the experimental chamber, the lubricating oil entering the bearing is completely separated from the lubricating oil not collected by the radial oil collection ring, effectively solving the problem of inaccurate measurement of the oil collection amount and the oil collection efficiency caused by oil leakage, and can provide data support for the analysis of the oil collection performance and the structural optimization design of the high-speed rolling bearing radial ring under lubrication of an aeroengine.

[0031] (2) The oil supply system of the present application can provide lubricating oil with adjustable temperature, pressure and flow rate for the experimental section. Turning on the internal circulation of the oil supply system can evenly heat the lubricating oil to the set temperature, and the lubricating oil enters the experimental section through the oil supply nozzle after passing through the overflow valve and the pneumatic valve. In the present application, the oil supply nozzle, the cover plate, the outer cover, the radial oil collection ring, the bearing inner ring and the bushing assembly are convenient to disassemble and assemble, easy to replace and assemble, and different component combinations can be realized.

[0032] (3) The present application uses the least squares method to calculate the lubricating oil mass flow rate for the return oil mass of the lubricating oil, which can obtain a high-precision lubricating oil mass flow rate in a short sampling time. At the same time, compare and judge the total return oil mass flow rate with the test value of the flowmeter of the oil supply system to ensure the test accuracy and reliability of the lubricating oil collection experiment under the radial ring. Description of the Drawings

[0033] The present application can be better understood by referring to the description given below in conjunction with the accompanying drawings, which are included in and form a part of this specification together with the following detailed description. In the drawings:

[0034] Figure 1 shows a schematic diagram of the overall structure of an experimental bench for the radial ring under-lubrication oil collection characteristics of an aviation high-speed bearing according to an embodiment of the present application;

[0035] Figure 2 shows a sectional view of an experimental system according to an embodiment of the present application;

[0036] Figure 3 shows a perspective view of an experimental system according to an embodiment of the present application;

[0037] Figure 4 shows Figure 2 an enlarged schematic view of part A in

[0038] Figure 5 shows a graph of the change in the oil return quality of lubricating oil over time;

[0039] Figure 6 shows the calculated oil return mass flow rate at different sampling intervals;

[0040] Figure 7 shows a comparison graph of the oil supply and oil return mass flow rates at different rotational speeds.

[0041] Reference numerals:

[0042] 1 - oil supply system, 2 - experimental system, 3 - oil return system, 4 - test system, 5 - shooting system;

[0043] 11 - lubricating oil tank, 12 - oil supply pipeline, 13 - oil supply pump, 14 - lubricating oil filter, 15 - overflow valve, 16 - pneumatic valve, 17 - oil supply nozzle;

[0044] 21 - radial oil collection ring, 22 - experimental chamber, 22 - 1 - outer cover, 22 - 2 - front cover plate, 22 - 3 - rear cover plate, 22 - 4 - front chamber, 22 - 5 - rear chamber, 23 - high-speed motor, 24 - bearing inner ring, 25 - main shaft, 26 - oil return port, 26 - 1 - front-side oil return port, 26 - 2 - rear-side oil return port, 27 - long bolt, 28 - bushing, 29 - locking nut; 210 - V-shaped block, 211 - adjusting rod, 212 - oil retaining boss, 213 - oil retaining partition; 214 - long pull rod bolt, 215 - support plate, 216 - base, 217 - strip groove, 218 - nano tape, 219 - observation window;

[0045] 31 - Oil collection cup, 31 - 1 - First oil collection cup, 31 - 2 - Second oil collection cup, 32 - Oil return pump, 33 - Lubricating oil filter, 34 - Oil - gas separator, 35 - Radiator, 36 - Pipeline;

[0046] 41 - Electronic scale, 41 - 1 - First electronic scale, 41 - 2 - Second electronic scale, 42 - Mass flow meter, 43 - First temperature sensor, 44 - Second temperature sensor, 45 - Third temperature sensor, 46 - First pressure sensor, 47 - Second pressure sensor;

[0047] 51 - High - speed camera, 52 - Image acquisition computer, 53 - Photography lamp. Detailed implementation manners

[0048] In the following, exemplary embodiments of the present application will be described in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual embodiments are described in the specification. However, it should be understood that in the process of developing any such actual embodiment, many embodiment - specific decisions can be made to achieve the specific goals of the developer, and these decisions may vary with different embodiments.

[0049] Here, it should also be noted that in order to avoid obscuring the present application with unnecessary details, only the device structures closely related to the solution of the present application are shown in the drawings, while other details less related to the present application are omitted.

[0050] It should be understood that the present application is not limited to the described embodiments due to the following description with reference to the drawings. In this text, where feasible, embodiments can be combined with each other, features can be replaced or borrowed between different embodiments, and one or more features can be omitted in one embodiment.

[0051] An experimental bench for the oil collection characteristics of an aviation high - speed bearing under the radial ring lubrication is provided in an embodiment of the present application. Figure 1 The overall structural schematic diagram of the experimental bench for the oil collection characteristics of an aviation high - speed bearing under the radial ring lubrication according to an embodiment of the present application is shown. Refer to Figure 1 , the experimental bench includes a fuel supply system 1, an experimental system 2, an oil return system 3, a test system 4, and a photographing system 5; the fuel supply system 1 is used to deliver lubricating oil to the experimental system 2; the experimental system 2 is used to conduct the lubricating oil collection experiment, and the experimental system 2 includes a radial oil collection ring 21; the test system 4 is used to obtain the oil return mass and the fuel supply mass flow rate, and the oil return mass and the fuel supply mass flow rate are used to determine the oil collection efficiency of the radial oil collection ring 21; the photographing system 5 is used to obtain the broken and splashed images of the lubricating oil jet in the experimental system; the oil return system 3 is used to deliver the lubricating oil in the experimental system 2 back to the fuel supply system 3 after the lubricating oil collection experiment ends. The specific structural designs of each system are introduced in detail below.

[0052] In this embodiment, the imaging system 5 includes a high-speed camera 51, an image acquisition computer 52, and a photographic lamp 53. Under the illumination of the photographic lamp 53, the high-speed camera 51 can acquire the fragmentation and splashing images of the lubricating oil jet in the experimental system 2, that is, capture the oil vectors and oil droplets formed by the interaction between the lubricating oil jet and the radial oil collecting ring 21 in the experimental system

[0053] In one embodiment, referring to Figure 1 , the oil supply system 1 includes an oil sump 11 and an oil supply pipeline 12 that is hermetically connected to the oil sump 11. An oil supply pump 13, an oil filter 14, a relief valve 15, a pneumatic valve 16, and an oil supply nozzle 17 are provided on the oil supply pipeline 12. The oil supply nozzle 17 extends into the experimental system 2 to inject lubricating oil into the experimental system 2.

[0054] In this embodiment, the oil supply pump 13 extracts lubricating oil from the oil sump 11 and makes it pass through the oil filter 14 and the relief valve 15 in sequence. There are two branches at the outlet of the relief valve 15. The first branch is connected to the pneumatic valve 16 and the oil supply nozzle 17 in sequence, and the lubricating oil enters the experimental system 2 through this branch. The second branch is connected to the oil sump 11. After closing the pneumatic valve 16, all the lubricating oil passes through the second branch and enters the oil sump 11, which can realize the rapid preheating of the lubricating oil. Here, the pneumatic valve 16 is arranged behind the relief valve 15. After opening the pneumatic valve 16, constant-pressure oil supply to the oil supply nozzle 17 can be achieved by adjusting the opening of the relief valve 15 according to the experimental conditions.

[0055] In one embodiment, Figure 2 shows a cross-sectional view of the experimental system according to an embodiment of the present application. Referring to Figure 2 , the experimental system 2 includes an experimental chamber 22 and a high-speed motor 23. A radial oil collecting ring 21 and a bearing inner ring 24 are arranged in the experimental chamber 22. The high-speed motor 23, the radial oil collecting ring 21, and the bearing inner ring 24 are coaxially arranged. The high-speed motor 23 is connected to the main shaft 25 through a coupling. The high-speed motor 23 can drive the radial oil collecting ring 21 and the bearing inner ring 24 to rotate synchronously at high speed through the main shaft 25. A return oil port 26 is provided at the bottom of the experimental chamber 22 for the return oil in the experimental chamber 22 to flow out.

[0056] In this embodiment, the rotation speed of the high-speed motor 23 is controlled by a frequency converter. The main shaft 25 is connected to the shaft sleeve 28 through a long bolt 27. The radial oil collecting ring 21 and the bearing inner ring 24 are pressed on the shaft sleeve 28 through a locking nut 29, thereby realizing the synchronous high-speed rotation of the radial oil collecting ring 21, the bearing inner ring 24, the shaft sleeve 28, and the main shaft 25. Here, the main shaft 25 and the shaft sleeve 28 in the experimental system 2 are positioned by a conical surface, and are connected and tightened through a long bolt 27 at the center to transmit torque. The radial oil collecting ring 21 and the bearing inner ring 24 are sleeved on the shaft sleeve 28 and are pressed through a locking nut 29.

[0057] Specifically, Figure 3A perspective view of an experimental system according to an embodiment of the present application is shown. Refer to Figure 3 , the experimental chamber 22 is surrounded by an outer cover 22-1, a front cover plate 22-2 and a rear cover plate 22-3. The oil return port 26 is provided at the bottom of the experimental chamber 22. Here, the outer cover 22-1 of the experimental chamber 22 is pressed between the front cover plate 22-2 and the rear cover plate 22-3 by long tie bolts 214. The rear cover plate 22-3 of the experimental chamber 22 is fixed to the support plate 215 by bolts. The support plate 215 is installed on the base 216, enabling quick disassembly and assembly of the experimental chamber 22.

[0058] Furthermore, refer to Figure 3 , the experimental system 2 further includes a V-block 210 and an adjusting rod 211. The oil supply nozzle 17 of the oil supply system 1 is tightened in the V-block 210 by a setscrew. The oil supply nozzle 17 can move along its own axis to adjust the distance between the oil supply nozzle 17 and the radial oil collection ring 21; the V-block 210 and the adjusting rod 211 are fixedly connected. When adjusting the adjusting rod 211, the injection angle of the oil supply nozzle 17 can be adjusted through the V-block 210 to adapt to different experimental conditions.

[0059] In one embodiment, Figure 4 shows Figure 2 an enlarged schematic view of part A in Figure 4 , a oil retaining boss 212 is provided on the outer circle of the radial oil collection ring 21. A oil retaining partition 213 is provided on the inner wall of the outer cover 22-1 of the experimental chamber 22. The oil retaining boss 212 and the oil retaining partition 213 are close but do not touch each other, and a radial micro-gap is formed therebetween; the oil retaining boss 212 and the oil retaining partition 213 divide the experimental chamber 22 into a front chamber 22-4 and a rear chamber 22-5. The lubricating oil collected by the radial oil collection ring 21 enters the rear chamber 22-5 through an oil pipeline, and the lubricating oil not collected by the radial oil collection ring 21 enters the front chamber 22-4.

[0060] Furthermore, the oil return port 26 includes a front-side oil return port 26-1 and a rear-side oil return port 26-2, which are respectively provided at the bottom of the front chamber 22-4 and the bottom of the rear chamber 22-5. In this embodiment, the lubricating oil in the front chamber 22-4 flows back to the first oil collection cup 31-1 through the front-side oil return port 26-1 and is weighed on the first electronic scale 41-1. The lubricating oil in the rear chamber 22-5 flows back to the second oil collection cup 31-2 through the rear-side oil return port 26-2 and is weighed on the second electronic scale 41-2.

[0061] In this embodiment, the arrangement of the oil retaining boss 212 and the oil retaining partition 213 can completely separate the lubricating oil collected by the radial oil collection ring 21 from the uncollected lubricating oil, and there will be no problem of inaccurate measurement of the oil collection amount and oil collection efficiency due to oil leakage.

[0062] Furthermore, refer to Figure 4, the oil baffle 213 is a wedge-shaped structure. The inner width w1 of the oil baffle 213 is not greater than the width w2 of the oil retaining boss 212. The outer width w3 of the wedge edge of the oil baffle 213 is not less than the width of the oil retaining boss 212. The inner wedge angle α of the wedge edge is 30° - 35°, and the outer wedge angle β of the wedge edge is 135° - 155°.

[0063] Further, a strip-shaped groove 217 is formed on the outer cover 22-1 of the experimental chamber 22. The oil supply nozzle 17 of the oil supply system 1 penetrates into the experimental chamber 22 through the strip-shaped groove 217.

[0064] In this embodiment, the gap between the oil supply nozzle 17 and the strip-shaped groove 217 is sealed with a nano tape 218 to prevent the leakage of lubricating oil. The material of the outer cover 22-1 of the experimental chamber 22 is plexiglass, and the front cover plate 22-2 is provided with an observation window 219. Through the outer cover 22-1 or the observation window 219, a high-speed camera 51 can be used to capture the flow pattern of the lubricating oil jet, including the breakup of the lubricating oil jet and the formation of oil vectors and oil droplets.

[0065] In one embodiment, the test system 4 includes an electronic scale 41 and a mass flow meter 42. The electronic scale 41 is arranged below the experimental chamber 22 of the experimental system 2 for obtaining the return oil mass. The mass flow meter 42 is arranged on the oil supply pipeline 12 of the oil supply system 1 for obtaining the oil supply mass flow rate. Here, two electronic scales 41 can be provided, namely the first electronic scale 41-1 and the second electronic scale 41-2.

[0066] Further, the test system 4 further includes a first temperature sensor 43, a second temperature sensor 44, a third temperature sensor 45, a first pressure sensor 46 and a second pressure sensor 47. The first temperature sensor 43 is arranged in the oil sump 11 of the oil supply system 1. The second temperature sensor 44 is arranged in front of the overflow valve 15 of the oil supply system 1. The third temperature sensor 45 is arranged in front of the oil supply nozzle 17 of the oil supply system 1. The first pressure sensor 46 is arranged in front of the overflow valve 15 of the oil supply system 1. The second pressure sensor 47 is arranged in front of the oil supply nozzle 17 of the oil supply system 1.

[0067] In the above embodiment, the electronic scale 41, the mass flow meter 42, the first temperature sensor 43, the second temperature sensor 44, the third temperature sensor 45, the first pressure sensor 46 and the second pressure sensor 47 are all connected to the dynamic data acquisition instrument through terminal blocks. The dynamic data acquisition instrument and the frequency converter are connected to the industrial computer through Ethernet. Here, the first temperature sensor 43 is used to collect the temperature of the oil sump 11. The second temperature sensor 44 and the third temperature sensor 45 are used to collect the oil supply pressure temperature at different positions of the oil supply pipeline 12. The first pressure sensor 46 and the second pressure sensor 47 are used to collect the oil supply pressure at different positions of the oil supply pipeline 12.

[0068] In one embodiment, the oil return system 3 includes an oil collection cup 31, an oil return pump 32, an oil filter 33, an oil-gas separator 34, and a radiator 35. The oil collection cup 31 is disposed below the experimental chamber 22 of the experimental system 2, and the lubricating oil flows from the oil return port 26 of the experimental chamber 22 to the oil collection cup 31 under the action of gravity. The oil return pump 32 extracts the lubricating oil through a pipeline 36 extending into the oil collection cup 31 and pumps the lubricating oil to the oil tank 11 of the oil supply system 1 through the oil filter 33, the oil-gas separator 34, and the radiator 35 in sequence.

[0069] In this embodiment, there are 2 oil collection cups 31, including a first oil collection cup 31-1 and a second oil collection cup 31-2.

[0070] The embodiment of the present application further provides a method for testing the oil collection characteristics under the radial ring of an aviation high-speed bearing, including:

[0071] Set the lubricating oil temperature, oil supply pressure, and oil supply temperature required in the experiment, close the pneumatic valve of the oil supply system, start the oil supply pump to uniformly heat the lubricating oil to the set temperature; adjust the oil supply nozzle to the angle required for the experimental condition; seal the opening part of the strip groove of the experimental chamber with nano tape; set the frequency converter frequency according to the required experimental speed and then start the high-speed motor, and accelerate the high-speed motor to the set speed and then operate stably;

[0072] Open the pneumatic valve of the oil supply system to make the lubricating oil enter the experimental chamber through the oil supply nozzle;

[0073] After the lubricating oil flow rate flowing from the experimental chamber of the experimental system into the oil collection cup is stable, continuously collect and record the oil supply mass flow rate and the oil return mass within no less than 30 s, and at the same time take and save the broken and splashed images of the lubricating oil jet according to the experimental requirements;

[0074] Stop the high-speed motor, close the pneumatic valve of the oil supply system to make the oil supply system start internal circulation; turn on the oil return pump, extend the pipeline into the oil collection cup to pump the lubricating oil back to the oil tank, close the oil return pump after pumping, and zero the electronic scale;

[0075] Change the required experimental speed, oil supply pressure, and oil supply temperature, and repeat the above steps to complete the parameter measurement of other experimental conditions;

[0076] Perform time averaging on the oil return mass collected under different experimental conditions to calculate the time average value of the oil return mass; apply the least square method to calculate the oil return mass flow rate for the time average value of the oil return mass, and compare the oil return mass flow rate with the oil supply mass flow rate. If the difference between the two is greater than 0.5%, check whether there is oil leakage in the experimental system or whether there is a malfunction in the test instrument. If the difference between the two is less than 0.5%, calculate the ratio of the oil return mass flow rate of the second electronic scale to the oil supply mass flow rate, which is the oil collection efficiency of the radial oil collection ring.

[0077] Figure 5 Shows the variation diagram of the return oil quality of the lubricating oil over time, Figure 6 Shows the calculated return oil mass flow rate at different sampling intervals, Figure 7 Shows the comparison diagram of the supply oil and return oil mass flow rates at different rotational speeds. As Figures 5 to 7 shown, under the condition that the experimental system and the supply oil system are operating stably, according to the collected mass of the lubricating oil received by the electronic scale, there are still slight fluctuations in the received oil mass flow rate. To eliminate the influence of the fluctuations in the received oil mass of the lubricating oil on the received oil quantity and received oil performance, the least squares method is applied to the continuously collected lubricating oil mass data to calculate its slope, that is, the lubricating oil mass flow rate. The least squares method is used to calculate the lubricating oil mass flow rate for the lubricating oil mass collected at different time intervals. By comparison, the fluctuations in the lubricating oil mass flow rate are very large when the sampling time interval is short. As the sampling time increases, the fluctuations in the lubricating oil mass flow rate gradually decrease. When the sampling time interval reaches 30 s, the fluctuations in the lubricating oil mass flow rate become very small. Further increasing the sampling time, the amplitude of the fluctuations in the lubricating oil mass flow rate hardly decreases any more, indicating that increasing the sampling duration has almost no impact on the calculation accuracy of the received oil quantity and received oil efficiency. Therefore, on the premise of ensuring the experimental measurement accuracy, to improve the experimental efficiency of the lubricating oil receiving under the radial ring, it is required in the experiment that the sampling time of the lubricating oil mass is not less than 30 s. Further, the total return oil mass flow rate of the lubricating oil in the received oil cup is compared with the measured value of the mass flowmeter in the supply oil system. When there is no oil leakage in the experimental section and the testing instrument is free of faults, the difference between the total return oil mass flow rate and the measured value of the mass flowmeter in the supply oil system is less than 0.5%. When the difference between the two exceeds 0.5%, it is necessary to check whether there is oil leakage in the experimental section or whether there is a fault in the testing instrument.

[0078] As described above, only various embodiments of the present application are provided, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claimed rights.

Claims

1. An experimental platform for the oil collection characteristics of radial ring under-lubrication of an aviation high-speed bearing, characterized in that, It includes an oil supply system (1), an experimental system (2), an oil return system (3), a test system (4), and a photographing system (5); The said oil supply system (1) is used to convey lubricating oil to the said experimental system (2); The said experimental system (2) is used to conduct a lubricating oil collection experiment. The said experimental system (2) includes a radial oil collection ring (21); The said test system (4) is used to obtain the oil return quality and the oil supply mass flow rate. The said oil return quality and the said oil supply mass flow rate are used to determine the oil collection efficiency of the said radial oil collection ring (21); The said photographing system (5) is used to obtain the fragmentation and splashing images of the lubricating oil jet inside the said experimental system (2); The said oil return system (3) is used to convey the lubricating oil in the said experimental system (2) back to the said oil supply system (1) after the lubricating oil collection experiment ends; The said experimental system (2) includes an experimental chamber (22), and a radial oil collection ring (21) is arranged inside the said experimental chamber (22); An oil retaining boss (212) is arranged on the outer circumference of the said radial oil collection ring (21), and an oil retaining partition plate (213) is arranged on the inner wall of the outer cover (22-1) of the said experimental chamber (22). The said oil retaining boss (212) and the said oil retaining partition plate (213) are close to each other but do not touch, and a radial micro-gap is formed between them. The said oil retaining boss (212) and the said oil retaining partition plate (213) divide the said experimental chamber (22) into a front chamber (22-4) and a rear chamber (22-5). The lubricating oil collected by the said radial oil collection ring (21) enters the rear chamber (22-5) through an oil pipeline, and the lubricating oil not collected by the said radial oil collection ring (21) enters the front chamber (22-4); The said oil retaining partition plate (213) is of a wedge-shaped structure. The inner width w1 of the said oil retaining partition plate (213) is not greater than the width w2 of the said oil retaining boss (212), the outer width w3 of the wedge edge of the said oil retaining partition plate (213) is not less than the width of the said oil retaining boss (212), the inner wedge angle α of the said wedge edge is 30°-35°, and the outer wedge angle β of the said wedge edge is 135°-155°.

2. The test bench according to claim 1, characterized in that, The said oil supply system (1) includes an oil tank (11) and an oil supply pipeline (12) that is hermetically connected to the said oil tank (11). A lubricating oil pump (13), a lubricating oil filter (14), an overflow valve (15), a pneumatic valve (16), and an oil supply nozzle (17) are arranged on the said oil supply pipeline (12). The said oil supply nozzle (17) extends into the said experimental system (2) to inject lubricating oil into the said experimental system (2).

3. The test bench according to claim 1, characterized in that, The said experimental system (2) includes: an experimental chamber (22), a high-speed motor (23). A radial oil collection ring (21) and a bearing inner ring (24) are arranged inside the said experimental chamber (22). The said high-speed motor (23), the said radial oil collection ring (21), and the said bearing inner ring (24) are coaxially arranged. The said high-speed motor (23) is connected to a main shaft (25) through a coupling. The said high-speed motor (23) can drive the said radial oil collection ring (21) and the said bearing inner ring (24) to rotate synchronously at high speed through the said main shaft (25). A return oil port (26) is arranged at the bottom of the said experimental chamber (22) for the return oil inside the said experimental chamber (22) to flow out.

4. The test bench according to claim 3, characterized in that, The experimental system (2) further includes a V-block (210) and an adjusting rod (211). The fuel supply nozzle (17) of the fuel supply system (1) is fastened in the V-block (210) by a setscrew. The fuel supply nozzle (17) can move along its own axis to adjust the distance between the fuel supply nozzle (17) and the radial oil collecting ring (21). The V-block (210) and the adjusting rod (211) are fixedly connected. When adjusting the adjusting rod (211), the injection angle of the fuel supply nozzle (17) can be adjusted through the V-block (210).

5. The test bench according to claim 3, characterized in that, The oil return port (26) includes a front oil return port (26-1) and a rear oil return port (26-2), which are respectively arranged at the bottom of the front cavity (22-4) and the bottom of the rear cavity (22-5).

6. The test bench according to claim 3, characterized in that, A strip-shaped groove (217) is formed in the outer cover (22-1) of the experimental cavity (22). The fuel supply nozzle (17) of the fuel supply system (1) penetrates into the experimental cavity (22) through the strip-shaped groove (217).

7. The test bench according to claim 1, characterized in that, The test system (4) includes: an electronic scale (41) and a mass flowmeter (42). The electronic scale (41) is arranged below the experimental cavity (22) of the experimental system (2) for obtaining the oil return mass. The mass flowmeter (42) is arranged on the fuel supply pipeline (12) of the fuel supply system (1) for obtaining the fuel supply mass flow rate.

8. The test bench according to claim 1, wherein The test system (4) further includes: a first temperature sensor (43), a second temperature sensor (44), a third temperature sensor (45), a first pressure sensor (46) and a second pressure sensor (47). The first temperature sensor (43) is arranged in the lubricating oil tank (11) of the fuel supply system (1). The second temperature sensor (44) is arranged in front of the overflow valve (15) of the fuel supply system (1). The third temperature sensor (45) is arranged in front of the fuel supply nozzle (17) of the fuel supply system (1). The first pressure sensor (46) is arranged in front of the overflow valve (15) of the fuel supply system (1). The second pressure sensor (47) is arranged in front of the fuel supply nozzle (17) of the fuel supply system (1).

9. The test bench according to claim 1, characterized in that, The oil return system (3) includes: an oil collection cup (31), an oil return pump (32), an oil filter (33), an oil-gas separator (34) and a radiator (35). The oil collection cup (31) is arranged below the experimental cavity (22) of the experimental system (2). The lubricating oil flows from the oil return port (26) of the experimental cavity (22) to the oil collection cup (31) under the action of gravity. The oil return pump (32) extracts the lubricating oil through a pipeline (36) extending into the oil collection cup (31) and sequentially passes through the oil filter (33), the oil-gas separator (34) and the radiator (35) to pump the lubricating oil to the lubricating oil tank (11) of the fuel supply system (1).

10. A method for testing the oil collection characteristics of radial ring under lubrication of an aircraft high-speed bearing, based on the test bench described in any one of claims 1-9, characterized in that, Includes: Set the lubricating oil temperature, oil supply pressure and oil supply temperature required in the experiment, close the pneumatic valve of the oil supply system, start the oil supply pump to evenly heat the lubricating oil to the set temperature; adjust the oil supply nozzle to the angle required for the experimental condition; seal the opening part of the strip-shaped groove of the experimental chamber with nano tape; set the frequency converter frequency according to the required experimental speed and then start the high-speed motor, and accelerate the high-speed motor to the set speed and then run stably; Open the pneumatic valve of the oil supply system to allow the lubricating oil to enter the experimental chamber through the oil supply nozzle; After the lubricating oil flow rate flowing from the experimental chamber of the experimental system into the oil collection cup is stable, continuously collect and record the oil supply mass flow rate and the return oil mass within no less than 30 s, and at the same time take and save the broken and splashed images of the lubricating oil jet according to the experimental requirements; Stop the high-speed motor, close the pneumatic valve of the oil supply system to make the oil supply system start internal circulation; open the return oil pump, extend the pipeline into the oil collection cup to pump the lubricating oil back to the lubricating oil tank, close the return oil pump after pumping, and zero the electronic scale; Change the required experimental speed, oil supply pressure and oil supply temperature, repeat the above steps to complete the parameter measurement of other experimental conditions; Perform time averaging on the return oil mass collected under different experimental conditions to calculate the time average value of the return oil mass; apply the least squares method to calculate the return oil mass flow rate for the time average value of the return oil mass, and compare the return oil mass flow rate with the oil supply mass flow rate. If the difference between the two is greater than 0.5%, check whether there is oil leakage in the experimental system or whether there is a malfunction in the test instrument. If the difference between the two is less than 0.5%, calculate the ratio of the return oil mass flow rate of the second electronic scale to the oil supply mass flow rate, which is the oil collection efficiency of the radial oil collection ring.

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