Simulation test device for bearing cavity of aero-engine

Abstract

The invention belongs to the technical field of aero-engine bearing cavity simulation test design, and particularly relates to an aero-engine bearing cavity simulation test device which has bearing jet oil supply and under-ring oil supply at the same time and can simulate the main oil supply mode of a bearing cavity. The collision of rotating parts such as a turbine disc and a gear in a bearing cavity to the lubricating oil drops can be approximately simulated; simulation of basic sealing air inlet and ventilation functions of the bearing cavity can be realized.

Description

Technical Field

[0001] This application belongs to the technical field of simulation test design for aero-engine bearing cavity, and specifically relates to a simulation test device for aero-engine bearing cavity. Background Technology

[0002] The bearing cavity of an aero-engine is an important component of the lubrication system, mainly composed of bearings, sealing devices, nozzles, shafts, and bearing housings. The interior of the aero-engine bearing cavity is a complex two-phase oil-gas flow environment. Current aero-engine bearing cavity simulation test devices can only simulate the working characteristics of the bearings themselves. The test cavity can only achieve simple bearing oil supply and return, and cannot simultaneously simulate multiple bearing oil supply methods (ejection oil supply, under-ring oil supply), shaft oil throwing (collision of oil droplets by turbine disks, gears, etc.), ventilation and exhaust characteristics, etc. The research on the flow characteristics within the bearing cavity is relatively limited, making it difficult to effectively support the structural design of aero-engine bearing cavities.

[0003] This application is made in view of the aforementioned technical deficiencies. Summary of the Invention

[0004] The purpose of this application is to provide a simulation test device for the bearing cavity of an aero-engine to overcome or mitigate at least one of the known technical defects.

[0005] The technical solution of this application is:

[0006] An aero-engine bearing cavity simulation test device includes a housing, a shaft, a single roller bearing, and a double ball bearing.

[0007] The outer casing is a cylindrical structure, arranged horizontally, with an oil atomizing nozzle, an air supply connector, and a ventilation connector at the top, and an oil return port at the bottom.

[0008] Roller bearing housings and ball bearing housings are installed at both ends of the outer casing;

[0009] The pivot is positioned horizontally through the outer casing;

[0010] Roller bearing bushings and ball bearing bushings are fitted onto the rotating shaft. The roller bearing bushings and ball bearing bushings are located in the roller bearing housing, and the ball bearing housing is located inside the rotating shaft.

[0011] Roller bearing bushings, ball bearing bushings and rotating shafts form roller bearing oil inlets and ball bearing oil inlets;

[0012] The single roller bearing is installed inside the roller bearing housing and fitted onto the roller bearing bushing;

[0013] A lower oil supply passage for the roller bearing ring is formed between the single roller bearing and the roller bearing bushing. The lower oil supply passage for the roller bearing ring is connected to the oil receiving port of the roller bearing through an oil passage hole opened on the side wall of the roller bearing bushing, and the lower oil supply passage for the roller bearing ring is connected to an oil passage hole opened on the side wall of the inner ring of the single roller bearing.

[0014] The double ball bearing is installed inside the ball bearing housing and fitted onto the ball bearing bushing;

[0015] A ball bearing ring lower oil supply channel is formed between the double ball bearing and the ball bearing bushing. The ball bearing ring lower oil supply channel is connected to the ball bearing oil receiving port through an oil passage hole opened in the side wall of the ball bearing bushing, and the ball bearing ring lower oil supply channel is connected to the oil passage hole opened in the side wall of the inner ring of the double ball bearing.

[0016] The roller bearing bushing is fitted with a roller bearing graphite seal raceway, which is located outside the single roller bearing and has its opening facing the single roller bearing.

[0017] The outer side of the roller bearing housing is connected to the roller bearing graphite seal seat. The roller bearing graphite seal seat and the roller bearing graphite seal raceway cooperate to form a seal, forming a roller bearing environmental cavity between the roller bearing and the single roller bearing. The roller bearing environmental cavity is connected to the lower part of the housing through the oil return channel opened on the roller bearing housing.

[0018] A ball bearing graphite-sealed raceway is fitted onto the rotating shaft. The ball bearing graphite-sealed raceway is located outside the double ball bearing, with its opening facing the double ball bearing.

[0019] The ball bearing housing is connected to the ball bearing graphite seal seat on the outside. The ball bearing graphite seal seat and the ball bearing graphite seal raceway cooperate to form a seal, forming a ball bearing environmental cavity between the ball bearing and the double ball bearing.

[0020] The oil catch port of the ball bearing is located in the ball bearing's environmental cavity;

[0021] A first oil nozzle is connected to the roller bearing housing. The first oil nozzle is located inside the housing and has an oil nozzle facing the oil inlet of the roller bearing.

[0022] A second oil injector is connected to the ball bearing housing. The second oil injector extends between the two ball bearings and has an oil spray port facing the part between the inner and outer rings of the two ball bearings.

[0023] A third oil injector is connected to the ball bearing housing. The third oil injector extends into the ball bearing environment cavity and has an oil injection port that faces the ball bearing oil inlet.

[0024] According to at least one embodiment of this application, in the above-mentioned aircraft engine bearing cavity simulation test device, there are multiple oil return ports at the bottom of the outer casing;

[0025] An opening is provided at the top of the outer casing, which is sealed with a removable cover plate. The oil atomizing nozzle, air supply connector, and ventilation connector are located on the cover plate.

[0026] According to at least one embodiment of this application, in the above-mentioned aero-engine bearing cavity simulation test device, the single roller bearing adopts an outer ring flangeless bearing;

[0027] The double ball bearing adopts a split-ring deep groove ball bearing.

[0028] According to at least one embodiment of this application, in the above-mentioned aircraft engine bearing cavity simulation test device, an inner ring adjusting shim is provided between the inner rings of the double ball bearing, and an outer ring adjusting shim is provided between the outer rings.

[0029] According to at least one embodiment of this application, in the above-mentioned aircraft engine bearing cavity simulation test device, a lower oil supply channel of graphite sealing ring is formed between the graphite sealing runway of the roller bearing and the roller bearing bushing. The lower oil supply channel of graphite sealing ring is connected to the oil receiving port of the roller bearing through an oil passage hole opened on the roller bearing bushing. The lower oil supply channel of graphite sealing ring is connected to the opening of the graphite sealing runway of the roller bearing through an oil passage hole opened on the graphite sealing runway of the roller bearing.

[0030] According to at least one embodiment of this application, in the above-mentioned aircraft engine bearing cavity simulation test device, a roller bearing graphite seal air supply port is provided on the roller bearing graphite seal seat.

[0031] According to at least one embodiment of this application, in the above-mentioned aero-engine bearing cavity simulation test device, a ball bearing graphite seal air supply port is provided on the ball bearing graphite seal seat.

[0032] According to at least one embodiment of this application, in the above-described aero-engine bearing cavity simulation test apparatus, the third fuel injector has a fuel injection port facing the bearing graphite-sealed runway opening.

[0033] According to at least one embodiment of this application, in the above-mentioned aircraft engine bearing cavity simulation test device, an oil slinger is sleeved on the rotating shaft;

[0034] The outer edge of the oil slinger has an annular horizontal oil slinger edge and an inclined oil slinger edge. The horizontal oil slinger edge extends towards the single roller bearing, and the inclined oil slinger edge is inclined towards the double ball bearing.

[0035] The first fuel injector has a fuel nozzle facing the horizontal fuel splashing edge and a fuel nozzle facing the inclined fuel splashing edge.

[0036] According to at least one embodiment of this application, in the above-mentioned aircraft engine bearing cavity simulation test device, a spacer sleeve is sleeved on the rotating shaft, and the spacer sleeve is used to fix the axial position of the oil slinger on the rotating shaft.

[0037] This application provides a simulation test device for the bearing cavity of an aero-engine, which has at least the following beneficial technical effects:

[0038] It also features bearing jet oil supply and under-ring oil supply, which can simulate the main oil supply methods of the bearing cavity;

[0039] It can approximate the collision of rotating components such as turbine disks and gears with lubricating oil droplets inside the bearing cavity;

[0040] It can simulate the basic sealing, air intake, and ventilation functions of the bearing cavity. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of the aero-engine bearing cavity simulation test device provided in the embodiments of this application;

[0042] Figure 2 This is a partial schematic diagram of the aircraft engine bearing cavity simulation test device provided in the embodiments of this application;

[0043] Figure 3 This is a partial schematic diagram of the aircraft engine bearing cavity simulation test device provided in the embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the structure of the first fuel injector provided in an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the structure of the second fuel injector provided in an embodiment of this application;

[0046] Figure 6 This is a schematic diagram of the structure of the third fuel injector provided in the embodiments of this application;

[0047] in:

[0048] 1-Outer casing; 2-Shaft; 3-Single roller bearing; 4-Double ball bearing; 5-Oil atomizing nozzle; 6-Air supply connector; 7-Ventilation connector; 8-Cover plate; 9-Roller bearing housing; 10-Ball bearing housing; 11-Roller bearing bushing; 12-Ball bearing bushing; 13-Inner ring adjusting shim; 14-Outer ring adjusting shim; 15-Roller bearing graphite seal raceway; 16-Roller bearing graphite seal seat; 17-Ball bearing graphite seal raceway; 18-Ball bearing graphite seal seat; 19-Oil slinger; 20-Spacing sleeve; 21-First oil injector; 22-Second oil injector; 23-Third oil injector;

[0049] A - Roller bearing ambient cavity; B - Roller bearing graphite seal air supply port; C - Ball bearing ambient cavity; D - Ball bearing graphite seal air supply port.

[0050] To better illustrate this embodiment, some content in the accompanying drawings may be omitted, enlarged, or reduced. They are for illustrative purposes only and should not be construed as limiting the scope of this application. Detailed Implementation

[0051] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, and other related parts can be referred to the general design.

[0052] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The word "comprising" as used in this application description indicates that the concept preceding the word encompasses the concepts listed following the word and their equivalents, without excluding other related concepts.

[0053] Furthermore, the terms indicating location used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation" and "connection" used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0054] A simulation test device for aero-engine bearing cavity, such as Figures 1-3 As shown, it includes a housing 1, a rotating shaft 2, a single roller bearing 3, and a double ball bearing 4.

[0055] The outer shell 1 is a cylindrical structure, arranged horizontally, and the interior forms a bearing test chamber. The top is equipped with an oil atomizing nozzle 5, an air supply connector 6, and a ventilation connector 7, and the bottom is equipped with an oil return port, which can be multiple.

[0056] An opening is provided at the top of the outer casing 1, which is sealed by a removable cover plate 8. The oil atomizing nozzle 5, the air supply connector 6, and the ventilation connector 7 are provided on the cover plate 8.

[0057] The oil supply atomizing nozzle 5 is connected to the lubricating oil source through a pipeline, and the air supply connector 6 is connected to the high-pressure air source. During the test, the oil supply atomizing nozzle 5 can be used to supplement the housing 1 with fine lubricating oil droplets, and the air supply connector 6 can be used to supply air to the housing 1 to increase the oil and air supply adjustment range inside the housing 1 to simulate the complex oil and gas two-phase environment inside the bearing cavity.

[0058] The ventilation connector 7 is connected to the external environment through a pipeline. During the test, ventilation can be provided to the inside of the outer casing 1 through the ventilation connector 7 to simulate the ventilation function of the bearing cavity. Throttling nozzles with different inner diameters can be installed in the ventilation connector 7 to simulate the throttling ventilation function of the bearing cavity.

[0059] Roller bearing housings 9 and ball bearing housings 10 are installed at both ends of the outer casing 1. Specifically, the roller bearing housings 9 and ball bearing housings 10 can be designed to be connected to the outer casing 1 by bolts through the connecting edges.

[0060] The rotating shaft 2 is set to pass through the outer shell 1 laterally. The roller bearing housing 9 and the ball bearing housing 10 are located on the outer periphery of the rotating shaft 2. One end of the rotating shaft 2 is connected to the drive motor, so that it can be driven by the motor during the test.

[0061] Roller bearing bushing 11 and ball bearing bushing 12 are fitted onto the rotating shaft 2. The roller bearing bushing 11 and ball bearing bushing 12 are located inside the roller bearing housing 9 and ball bearing housing 10. Specifically, the roller bearing bushing 11 and ball bearing bushing 12 can be designed to be clamped and fixed onto the rotating shaft 2 by bolts to the boss on the outer wall of the rotating shaft 2.

[0062] Roller bearing bushing 11, ball bearing bushing 12 and rotating shaft 2 are provided with roller bearing oil inlet and ball bearing oil inlet.

[0063] The single roller bearing 3 is installed inside the roller bearing housing 9 and sleeved on the roller bearing bushing 11. Specifically, the outer ring of the single roller bearing 3 can be fastened to the roller bearing housing 9 by bolts to the boss on the inner wall of the roller bearing housing 9, and the inner ring of the single roller bearing 3 can be clamped and fixed to the roller bearing bushing 11 by bolts to the boss on the outer wall of the roller bearing bushing 11.

[0064] A lower oil supply channel for the roller bearing ring is formed between the single roller bearing 3 and the roller bearing bushing 11. The lower oil supply channel for the roller bearing ring is connected to the oil receiving port of the roller bearing ring through an oil passage hole opened on the side wall of the roller bearing bushing 11, and the lower oil supply channel for the roller bearing ring is connected to an oil passage hole opened on the side wall of the inner ring of the single roller bearing 3.

[0065] The single roller bearing 3 can be a bearing without a flange on the outer ring to facilitate the assembly between the rotating parts and the housing 1.

[0066] The double ball bearing 4 is installed inside the ball bearing housing 10 and sleeved on the ball bearing bushing 12. Specifically, the outer ring of the double ball bearing 4 can be fastened to the ball bearing housing 10 by bolts to the boss on the inner wall of the ball bearing housing 10, and the inner ring of the double ball bearing 4 can be clamped and fixed to the ball bearing bushing 12 by bolts to the boss on the outer wall of the ball bearing bushing 12.

[0067] A ball bearing ring lower oil supply channel is formed between the double ball bearing 4 and the ball bearing bushing 12. The ball bearing ring lower oil supply channel is connected to the ball bearing oil receiving port through an oil passage hole opened in the side wall of the ball bearing bushing 12, and the ball bearing ring lower oil supply channel is connected to the oil passage hole opened in the side wall of the inner ring of the double ball bearing 4.

[0068] Double ball bearing 4 can be a split-ring deep groove ball bearing.

[0069] An inner ring adjusting shim 13 is provided between the inner rings of the double ball bearing 4, and an outer ring adjusting shim 14 is provided between the outer rings. The inner ring adjusting shim 13 and the outer ring adjusting shim 14 are pre-machined with different axial dimensions. By assembling the inner ring adjusting shim 13 and the outer ring adjusting shim 14 with matching axial dimensions, different preloads can be applied between the double ball bearings 4 to avoid slippage of the double ball bearings 4 under light load.

[0070] A roller bearing graphite seal raceway 15 is fitted onto the roller bearing bushing 11. The roller bearing graphite seal raceway 15 is located outside the single roller bearing 3, with its opening facing the single roller bearing 3. Specifically, the roller bearing graphite seal raceway 15 can be designed to be clamped and fixed onto the roller bearing bushing 11 by bolts to the boss on the outer wall of the roller bearing bushing 11.

[0071] A lower oil supply channel for the graphite seal ring is formed between the graphite seal raceway 15 of the roller bearing and the roller bearing bushing 11. The lower oil supply channel for the graphite seal ring is connected to the oil receiving port of the roller bearing through an oil passage hole opened on the roller bearing bushing 11. The lower oil supply channel for the graphite seal ring is connected to the opening of the graphite seal raceway 15 of the roller bearing through an oil passage hole opened on the graphite seal raceway 15 of the roller bearing.

[0072] The roller bearing housing 9 is connected to the roller bearing graphite seal housing 16 on the outside, which can be connected by bolts. The roller bearing graphite seal housing 16 and the roller bearing graphite seal raceway 15 cooperate to form a seal, forming a roller bearing environmental cavity A between the roller bearing housing 3 and the single roller bearing 3. The roller bearing environmental cavity A is connected to the lower part of the inner shell 1 through the oil return channel opened on the roller bearing housing 9.

[0073] A roller bearing graphite seal air supply port B is provided on the roller bearing graphite seal seat 16. During the test, sealing gas can be supplied to the roller bearing environmental cavity A through the roller bearing graphite seal air supply port B to simulate the sealing air intake of the bearing cavity.

[0074] A ball bearing graphite seal track 17 is sleeved on the rotating shaft 2. The ball bearing graphite seal track 17 is located outside the double ball bearing 4, with its opening facing the double ball bearing 4. Specifically, the ball bearing graphite seal track 17 can be designed to be clamped and fixed on the rotating shaft 2 by bolts to the boss on the outer wall of the rotating shaft 2.

[0075] The ball bearing housing 10 is connected to the ball bearing graphite seal 18 on the outside, which can be connected by bolts. The ball bearing graphite seal 18 and the ball bearing graphite seal raceway 17 cooperate to form a seal, forming a ball bearing environment cavity C between the ball bearing housing 10 and the double ball bearing 4. The ball bearing environment cavity C is connected to the lower part of the inner shell 1 through the oil return channel opened on the ball bearing housing 10.

[0076] The oil catch port of the ball bearing is located in the environmental cavity C of the ball bearing.

[0077] The ball bearing graphite seal seat 18 is provided with a ball bearing graphite seal air supply port D. During the test, sealing gas can be supplied to the ball bearing ambient cavity C through the ball bearing graphite seal air supply port D to simulate the sealing air intake of the bearing cavity.

[0078] The rotating shaft 2 is fitted with an oil slinger 19 and a spacer sleeve 20. Specifically, the oil slinger 19 and the spacer sleeve 20 can be clamped and fixed on the rotating shaft 2 by bolts with the boss on the rotating shaft 2. The axial position of the oil slinger 19 on the rotating shaft 2 can be adjusted by the length of the spacer sleeve 20.

[0079] The outer edge of the oil slinger 19 has an annular horizontal oil slinger edge and an inclined oil slinger edge. The horizontal oil slinger edge extends towards the single roller bearing 3, and the inclined oil slinger edge is inclined towards the double ball bearing 4.

[0080] A first oil nozzle 21 is connected to the roller bearing housing 9. The first oil nozzle 21 is located inside the housing 1 and has an oil nozzle facing the oil inlet of the roller bearing, an oil nozzle facing the horizontal oil-throwing edge, and an oil nozzle facing the inclined oil-throwing edge, as shown below. Figure 4 As shown.

[0081] The first oil injector 21 is connected to the lubricating oil source through the outer casing 1 via a pipeline. During the test, the first oil injector 21 can spray lubricating oil into the oil receiving port of the roller bearing through the oil injection port. Under the action of centrifugal force, the single roller bearing 3 is lubricated and cooled under the ring, and the graphite seal raceway 15 of the roller bearing is cooled under the ring.

[0082] The internal structure of the bearing cavity of an aero-engine is very complex. In addition to the bearing and the lubrication supply of the seal, there are also turbine disks and gear-like structures. During operation, the lubricating oil sprayed onto it will splash. During the test, the first oil nozzle 21 can spray lubricating oil through the oil nozzle to the horizontal oil splashing edge and the inclined oil splashing edge to simulate the structural characteristics.

[0083] A second oil injector 22 is connected to the ball bearing housing 10. The second oil injector 22 extends between the double ball bearings 4 and has an oil spray port facing the area between the inner and outer rings of the double ball bearings 4. Figure 5 As shown.

[0084] The second oil injector 22 is connected to the lubricating oil source through the outer casing 1 via a pipeline. During the test, the second oil injector 22 can spray lubricating oil into the space between the inner and outer rings of the double ball bearing 4 through the oil injection port to perform spray lubrication and cooling on the double ball bearing 4.

[0085] A third oil injector 23 is connected to the ball bearing housing 10. The third oil injector 23 extends into the ball bearing environmental cavity C and has an oil nozzle facing the ball bearing oil inlet and an oil nozzle facing the opening of the bearing graphite seal raceway. Figure 6 As shown.

[0086] The third oil injector 23 is connected to the lubricating oil source through the outer casing 1 via a pipeline. During the test, the third oil injector 23 can spray lubricating oil into the oil receiving port of the ball bearing through the oil injection port. Under the action of centrifugal force, the double ball bearing 4 is lubricated and cooled from the ring. The oil injector can also spray lubricating oil into the graphite sealing track 17 of the ball bearing through the oil injection port to spray and cool the graphite sealing track 17 of the ball bearing.

[0087] During the test, the lubricating oil entering the roller bearing environment cavity A and the ball bearing environment cavity C can flow into the outer shell 1 through the oil return channel, and then flow back to the lubricating oil groove through the oil return port via the pipeline. This simulates both the oil supply to the bearing cavity and the oil return to the bearing cavity.

[0088] The above embodiments disclose an aircraft engine bearing cavity simulation test apparatus:

[0089] The shaft 2 is designed to be supported on the housing 1 by single roller bearings 3 and double ball bearings 4 at both ends. This support scheme can facilitate the stability of the rotor component movement. The double ball bearings 4 can be used for axial positioning. The outer ring of the single roller bearing 3 can be separated from the roller, which can facilitate the assembly of the main body. The preload of the double ball bearing 4 can be adjusted by adjusting the shims between them to prevent the bearing from slipping under light load and ensure the normal operation of the main body of the test device.

[0090] It also features bearing injection oil supply and ring under-ring oil supply, realizing the simulation of the main oil supply mode of the bearing cavity, and is equipped with oil slinger 19 and injection oil supply, which can approximate the collision of lubricating oil droplets with rotating parts such as turbine disk and gear in the bearing cavity.

[0091] Double graphite seals are arranged at both ends to achieve air sealing by supplying high-pressure gas. A ventilation connector 7 is set to simulate the ventilation function of the bearing cavity, which can adjust the throttling characteristics of the exhaust path and realize the simulation of the pressure conditions of the bearing cavity. Atomizing nozzle 5 is set to supply oil and air connector 6 to supply air, which can increase the two-phase adjustment range of oil and air supply.

[0092] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A simulation test device for an aero-engine bearing cavity, characterized in that, Includes housing (1), shaft (2), single roller bearing (3), and double ball bearing (4); The outer shell (1) is a cylindrical structure, arranged horizontally, with an oil atomizing nozzle (5), an air supply connector (6), and a ventilation connector (7) at the top, and an oil return port at the bottom; Roller bearing housings (9) and ball bearing housings (10) are installed at both ends of the outer casing (1); The pivot (2) is set to extend laterally through the outer casing (1); Roller bearing bushing (11) and ball bearing bushing (12) are fitted on the rotating shaft (2). The roller bearing bushing (11) and ball bearing bushing (12) are located in the roller bearing housing (9) and the ball bearing housing (10) is located inside the rotating shaft (2). Roller bearing bushing (11), ball bearing bushing (12) and rotating shaft (2) are provided with roller bearing oil inlet and ball bearing oil inlet. The single roller bearing (3) is installed inside the roller bearing housing (9) and sleeved on the roller bearing bushing (11); A roller bearing ring lower oil supply channel is formed between the single roller bearing (3) and the roller bearing bushing (11). The roller bearing ring lower oil supply channel and the roller bearing oil receiving port are connected through an oil passage hole opened on the side wall of the roller bearing bushing (11). The roller bearing ring lower oil supply channel is connected to the oil passage hole opened on the side wall of the inner ring of the single roller bearing (3). The double ball bearing (4) is installed inside the ball bearing housing (10) and sleeved on the ball bearing bushing (12); A ball bearing ring lower oil supply channel is formed between the double ball bearing (4) and the ball bearing bushing (12). The ball bearing ring lower oil supply channel and the ball bearing oil receiving port are connected through an oil passage hole opened on the side wall of the ball bearing bushing (12). The ball bearing ring lower oil supply channel is connected to the oil passage hole opened on the side wall of the inner ring of the double ball bearing (4). A roller bearing graphite seal raceway (15) is fitted onto the roller bearing bushing (11). The roller bearing graphite seal raceway (15) is located outside the single roller bearing (3) and its opening faces the single roller bearing (3). The roller bearing housing (9) is connected to the outside of the roller bearing graphite seal housing (16). The roller bearing graphite seal housing (16) and the roller bearing graphite seal raceway (15) cooperate to form a seal, forming a roller bearing environment cavity (A) between the roller bearing housing (3) and the single roller bearing. The roller bearing environment cavity (A) is connected to the lower part of the outer shell (1) through the oil return channel opened on the roller bearing housing (9). A ball bearing graphite seal track (17) is sleeved on the rotating shaft (2). The ball bearing graphite seal track (17) is located outside the double ball bearing (4), and the opening faces the double ball bearing (4). The ball bearing housing (10) is connected to the ball bearing graphite seal housing (18) on the outside. The ball bearing graphite seal housing (18) and the ball bearing graphite seal raceway (17) cooperate to form a seal, forming a ball bearing environmental cavity (C) between the ball bearing housing (4) and the double ball bearing. The oil catch port of the ball bearing is located in the ball bearing environmental cavity (C); A first oil nozzle (21) is connected to the roller bearing housing (9). The first oil nozzle (21) is located inside the housing (1) and has an oil nozzle facing the oil inlet of the roller bearing. A second oil injector (22) is connected to the ball bearing housing (10). The second oil injector (22) extends into the space between the double ball bearings (4) and has an oil injection port facing the space between the inner and outer rings of the double ball bearings (4). A third oil nozzle (23) is connected to the ball bearing housing (10). The third oil nozzle (23) extends into the ball bearing environment cavity (C) and has an oil nozzle facing the ball bearing oil inlet.

2. The aero-engine bearing cavity simulation test device according to claim 1, characterized in that, The outer casing (1) has multiple oil return ports at the bottom; An opening is provided at the top of the outer casing (1), which is sealed by a removable cover plate (8). An oil atomizing nozzle (5), an air supply connector (6), and a ventilation connector (7) are provided on the cover plate (8).

3. The aero-engine bearing cavity simulation test device according to claim 2, characterized in that, The single roller bearing (3) adopts a bearing without outer ring flange; The double ball bearing (4) adopts an inner ring split-half deep groove ball bearing.

4. The aero-engine bearing cavity simulation test apparatus according to claim 3, characterized in that, An inner ring adjusting shim (13) is provided between the inner rings of the double ball bearing (4), and an outer ring adjusting shim (14) is provided between the outer rings.

5. The aero-engine bearing cavity simulation test apparatus according to claim 4, characterized in that, A lower oil supply channel for the graphite seal ring is formed between the roller bearing graphite seal raceway (15) and the roller bearing bushing (11). The lower oil supply channel for the graphite seal ring is connected to the roller bearing oil receiving port through an oil passage hole opened on the roller bearing bushing (11). The lower oil supply channel for the graphite seal ring is connected to the opening of the roller bearing graphite seal raceway (15) through an oil passage hole opened on the roller bearing graphite seal raceway (15).

6. The aero-engine bearing cavity simulation test apparatus according to claim 5, characterized in that, A roller bearing graphite seal air supply port (B) is provided on the roller bearing graphite seal seat (16).

7. The aero-engine bearing cavity simulation test apparatus according to claim 6, characterized in that, A ball bearing graphite seal air supply port (D) is provided on the ball bearing graphite seal seat (18).

8. The aero-engine bearing cavity simulation test apparatus according to claim 7, characterized in that, The third injector (23) has an injector port facing the graphite seal runway opening of the bearing.

9. The aero-engine bearing cavity simulation test apparatus according to claim 8, characterized in that, An oil slinger (19) is fitted onto the rotating shaft (2); The outer edge of the oil slinger (19) has a ring-shaped horizontal oil slinger edge and an inclined oil slinger edge. The horizontal oil slinger edge extends towards the single roller bearing (3), and the inclined oil slinger edge is inclined towards the double ball bearing (4). The first fuel injector (21) has a fuel nozzle facing the horizontal oil splashing edge and a fuel nozzle facing the inclined oil splashing edge.

10. The aero-engine bearing cavity simulation test apparatus according to claim 9, characterized in that, A spacer sleeve (20) is fitted onto the rotating shaft (2). The spacer sleeve (20) is used to fix the axial position of the oil slinger (19) on the rotating shaft (2).

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