Aero-engine transmission shaft bearing high-temperature fuel oil lubrication test equipment

Abstract

The invention discloses aero-engine transmission shaft bearing high-temperature fuel oil lubrication test equipment which comprises a test case and a test bed, a tool seat and a transmission shaft are arranged on the test bed, and a mounting hole is formed in the tool seat. The tool seat is provided with a lubrication simulation structure and a high-temperature gas channel, wherein the lubrication simulation structure is used for being communicated with an external oil pump to enable the oil pump to convey lubrication fuel oil into a mounting hole and forming an oil conveying channel to simulate the actual lubrication working condition of a bearing; the lubrication simulation structure is used for being communicated with an external gas pump to form a high-temperature gas channel and heating the mounting hole through high-temperature gas conveyed by the gas pump to simulate the actual high temperature of the bearing; according to the working condition high-temperature simulation structure, a loading structure and a driving structure are arranged on the test bed. The problems that a traditional aero-engine bearing test device is difficult to simulate actual lubrication, operation, high temperature and other working conditions of the bearing, so that the test result is inaccurate, and the traditional test device heats the operation environment of the to-be-tested bearing through an electric heating wire, so that electric sparks easily occur, and lubricating fuel oil burns are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing test equipment, and particularly to a high-temperature fuel lubrication test equipment for aero-engine drive shaft bearings. Background Art

[0002] In the field of aero-engines, the performance of drive shaft bearings is directly related to the reliability and safety of the engines. Conducting precise tests on drive shaft bearings to simulate their lubrication, operation, high-temperature and other working conditions in actual operation is a key link to ensure the quality and performance of the bearings. However, traditional aero-engine bearing test equipment has many defects: on the one hand, it is difficult to accurately simulate the actual lubrication, operation and high-temperature conditions of the bearings. For example, in terms of lubrication simulation, it is impossible to accurately deliver lubricating fuel through an oil pump to simulate the same lubrication state as when the actual bearing is running; when simulating the operating conditions, it is difficult to achieve stable driving of the drive shaft, so that the bearing rotates under near-real rotational speed and load conditions; in terms of high-temperature condition simulation, it is also unable to effectively simulate the high-temperature environment faced by the bearing in the engine. All these lead to inaccurate test results and cannot provide a reliable basis for the optimized design and performance improvement of the bearings. On the other hand, when traditional test equipment heats the operating environment of the test bearings, the electric heating wire heating method is mostly used, but this heating method is extremely likely to generate electric sparks. Since aero-engine drive shaft bearing tests often involve the use of lubricating fuel, once electric sparks occur, it is very likely to cause the combustion of the lubricating fuel, which not only causes serious damage to the test equipment, but also may endanger the safety of the test personnel, greatly limiting the application range and safety of the test equipment. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a high-temperature fuel lubrication test equipment for aero-engine drive shaft bearings, so as to solve the problems that traditional aero-engine bearing test equipment is difficult to simulate the actual lubrication, operation, high-temperature and other conditions of the bearings, resulting in inaccurate test results, and that traditional test equipment is prone to electric sparks when heating the operating environment of the test bearings, leading to the combustion of lubricating fuel.

[0004] To achieve the above object, the present invention provides a high-temperature fuel lubrication test device for an aero-engine transmission shaft bearing, comprising a test chassis and a test bench arranged inside the test chassis. A tooling seat and a transmission shaft are arranged on the test bench. An installation hole is formed in the tooling seat for the transmission shaft to pass through and cooperate with the transmission shaft for installing an external transmission shaft bearing to be tested. A lubrication simulation structure for communicating with an external oil pump to enable the oil pump to transport lubricating fuel into the installation hole and form an oil delivery channel to simulate the actual lubrication condition of the bearing, and a high-temperature simulation structure for communicating with an external air pump to form a high-temperature gas channel and heating the installation hole by the high-temperature gas transported by the air pump to simulate the actual high-temperature condition of the bearing are arranged on the tooling seat. A loading structure for applying axial and radial loads to the transmission shaft bearing to be tested and a driving structure for driving the transmission shaft to rotate to simulate the actual operating condition of the bearing are arranged on the test bench.

[0005] The advantages of adopting the above technical solution are as follows: In the above technology, by setting the lubrication simulation structure, it can be communicated with an external oil pump to accurately transport lubricating fuel into the installation hole and form an oil delivery channel, which can highly simulate the actual lubrication condition of the bearing, ensuring accurate testing of the bearing performance under lubrication conditions. At the same time, the high-temperature simulation structure can be communicated with an external air pump to heat the installation hole by transporting high-temperature gas, accurately simulating the actual high-temperature condition of the bearing. In addition, the driving structure can drive the transmission shaft to rotate, and the loading structure can apply axial and radial loads to the transmission shaft bearing to be tested, simulating the actual operating condition of the bearing from multiple aspects, greatly improving the accuracy of the test results and providing reliable data support for the performance evaluation and optimal design of the aero-engine transmission shaft bearing. Different from the traditional test device that uses electric heating wires to heat, which is prone to generate electric sparks and cause the combustion of lubricating fuel, the present invention uses the method of transporting high-temperature gas by an air pump to simulate the high-temperature condition, avoiding the risk of generating electric sparks due to heating, effectively reducing the possibility of lubricating fuel combustion, significantly improving the safety of the test process, ensuring the normal operation of the test device and the personal safety of the test personnel. In the above technology, in order to prevent risks such as fuel ignition or explosion due to too high concentration, the test chassis can be set outdoors and a special site can be built for the test. The mechanical part and the electrical part of the tester are separated to prevent sparks from igniting the fuel when the electricity is started. In order to reduce the fuel concentration, an exhaust system and an explosion-proof exhaust fan can be set on the test chassis to extract the treated volatile fuel gas and thus reduce the concentration. At the same time, an air-conditioning system can also be set on the test chassis. The air-conditioning system is used to prevent the temperature from being too high in summer outdoors and further reduce the test risk.

[0006] The present invention is further configured such that: an installation groove is circumferentially provided on the inner peripheral wall of the installation hole, the high-temperature simulation structure includes a heat conductor disposed in the installation groove, the radial cross-section of the heat conductor is annularly arranged and its shaft hole is coaxially arranged with the installation hole, a tooling sleeve is arranged in the shaft hole of the heat conductor, the tooling sleeve is sleeved on the transmission shaft, and an installation gap for installing the bearing of the transmission shaft to be tested is formed by the clearance fit between the inner peripheral wall of the tooling sleeve and the outer peripheral wall of the transmission shaft. The high-temperature gas channel is opened on the heat conductor, and an air inlet hole for communicating with the air outlet end of an external air pump and an air outlet hole for communicating with the air return end of the external air pump are opened on the heat conductor. The air inlet hole and the air outlet hole are both communicated with the high-temperature gas channel. Sealing plates are detachably connected to both ends of the tooling seat. Air ports for cooperating with the air pump to transmit high-temperature gas are respectively opened on the sealing plate close to the heat conductor at positions corresponding to the air inlet hole and the air outlet hole. An isolation assembly for closing the installation hole and combining with the installation gap to form an operation chamber is arranged on the tooling seat. The isolation assembly is composed of two partition plates respectively arranged at the openings at both ends of the installation hole.

[0007] The advantages of adopting the above technical solution are as follows: In the above technology, an installation groove is provided on the inner peripheral wall of the installation hole and a heat conductor is arranged. Its radial cross-section is annular and its shaft hole is coaxially arranged with the installation hole, so that the high-temperature gas channel uniformly surrounds the bearing of the transmission shaft to be tested. By connecting the air inlet hole with the air outlet end of the external air pump and the air outlet hole with the air return end, the high-temperature gas circulates in the high-temperature gas channel of the heat conductor, and the heat can be efficiently and accurately transferred to the installation gap, ensuring that the environmental temperature of the bearing of the transmission shaft to be tested is uniform and stable, highly restoring the high-temperature working condition in the engine, further improving the accuracy of high-temperature simulation, and providing a solid guarantee for the performance test of the bearing under high-temperature conditions. The sealing plates are detachably connected to both ends of the tooling seat, and air ports are opened on the sealing plate close to the heat conductor at positions corresponding to the air inlet hole and the air outlet hole. The setting of the air ports facilitates the connection and cooperation between the air pump and the heat conductor. In the above technology, an isolation assembly composed of two partition plates is arranged on the tooling seat, which closes the installation hole and combines with the installation gap to form an operation chamber, effectively preventing external impurities from entering the operation chamber, avoiding interfering with the test process, and ensuring that the bearing of the transmission shaft to be tested operates in a pure simulation environment. At the same time, the isolation assembly can reduce the heat dissipation and the volatilization of lubricating fuel in the operation chamber, maintaining the stability of the temperature and lubricating conditions in the operation chamber, thereby ensuring the stability and reliability of the test results.

[0008] The present invention is further configured such that: both ends of the heat conductor are respectively abutted against the inner wall of the adjacent sealing plate and the inner wall of the installation groove. A plurality of first ventilation holes are axially penetrated through the heat conductor. Along the axial direction of the heat conductor and at a position corresponding to one side of each first ventilation hole, a second ventilation hole is penetrated through. The end of each first ventilation hole is communicated with the start end of its corresponding second ventilation hole. The end of each second ventilation hole is communicated with the start end of its adjacent first ventilation hole. The combination of a plurality of the first ventilation holes and a plurality of the second ventilation holes forms a high-temperature gas passage. Any one of the first ventilation holes is communicated with the air inlet hole, and any one of the second ventilation holes is communicated with the air outlet hole.

[0009] The advantages of adopting the above technical solution are as follows: in the above technology, a plurality of first ventilation holes and second ventilation holes are axially penetrated through the heat conductor, and the two are staggered and communicated to form a unique high-temperature gas passage, enabling the high-temperature gas to perform complex and orderly circulating flow within the heat conductor. When the high-temperature gas enters from the air inlet hole, it passes through the first ventilation hole and then turns through the second ventilation hole and is communicated with the adjacent first ventilation hole. That is, a single first ventilation hole and a single second ventilation hole form a set of flow groups. After the high-temperature gas passes through all the flow groups, it is discharged to the air outlet hole through the second ventilation hole of the last flow group, thereby realizing efficient gas circulation. By means of multiple sets of flow groups, the residence time and contact area of the gas within the heat conductor are increased, enabling the heat to be transferred to the surrounding environment more efficiently, ensuring that the bearing of the test drive shaft can be quickly and evenly heated up, further improving the efficiency and accuracy of high-temperature simulation, making the flow of the high-temperature gas within the heat conductor more uniform, without the situation of too fast or too slow local gas flow rate, and thus making the heat distribution of the heat conductor more uniform in the entire circumferential direction and axial direction, thereby forming a stable and uniform temperature field within the installation gap; both ends of the heat conductor are respectively abutted against the inner wall of the adjacent sealing plate and the inner wall of the installation groove. This tight connection method not only ensures the sealing of the high-temperature gas passage and prevents gas leakage, but also enhances the structural stability of the heat conductor within the tooling seat; by reasonably adjusting the number, diameter of the first ventilation holes and the second ventilation holes, and their connection methods, the flow resistance and flow distribution of the high-temperature gas within the heat conductor can be flexibly changed, enabling the test equipment to accurately regulate the high-temperature simulation environment according to different models of aero-engine drive shaft bearings and different test requirements; in the above technology, due to the excellent heat conduction performance of the heat conductor, the temperature in the circumferential direction of the bearing can be made uniform, and the high-temperature gas can reach up to 500 degrees, effectively simulating the high-temperature environment transferred from the combustion chamber to the outer ring of the bearing.

[0010] The present invention is further provided with: a temperature measuring hole for cooperating with an external sensing device to detect the temperature of the tooling seat is provided on the tooling seat, and a vibration measuring hole for cooperating with an external sensing device to detect the vibration amplitude and vibration frequency of the transmission shaft bearing to be tested during the test is provided on the heat conductor.

[0011] The benefits of adopting the above technical solution are: the temperature measuring hole on the tooling seat in the above technology can be linked with external sensing equipment to detect the temperature of the tooling seat in real time and accurately, and the vibration measuring hole on the heat conductor can be linked with external sensing equipment to accurately detect the vibration amplitude and vibration frequency of the transmission shaft bearing to be tested during the test. By monitoring the vibration parameters, the working state of the bearing during operation can be intuitively reflected, and the temperature data can be complemented to ensure the comprehensiveness and reliability of the test data, providing a solid basis for accurately analyzing the bearing performance. With the linkage of the temperature measuring hole and the vibration measuring hole with the external sensing equipment, the abnormal conditions during the test can be monitored in time. When the temperature of the tooling seat rises abnormally, or the vibration amplitude and frequency of the transmission shaft bearing to be tested exceed the normal range, the sensing equipment can quickly feedback the signal to the operator or the control system. This enables the operator to take corresponding measures in time, such as adjusting the test parameters, stopping the equipment operation, etc., so as to effectively avoid equipment failures caused by excessive temperature or abnormal vibration, ensure the safe and stable operation of the test equipment, and reduce the risk of equipment damage and the potential occurrence rate of safety accidents.

[0012] The present invention is further provided that: the lubrication simulation structure includes an oil inlet hole for connecting with the output end of an external oil pump so that the lubricating fuel delivered by the oil pump can be poured into the operating chamber, and an oil return pipe for connecting with the input end of an external oil pump so that the lubricating fuel in the operating chamber can be returned to the oil pump, the oil inlet hole is provided on a tooling seat and a lubricating oil passage for connecting with the oil inlet hole is provided on the tooling sleeve, the lubricating oil passage is connected with the operating chamber, the tooling seat is provided with an oil return hole connected with the operating chamber, the oil return pipe is provided in the test bench and an end thereof passes through the test bench and is connected with the oil return hole.

[0013] The advantages of adopting the above technical solution are as follows: In the above technology, the lubricating fuel can be accurately poured into the operation chamber through the oil inlet hole communicating with the output end of the external oil pump, and the lubricating oil passage on the tooling sleeve communicates with the oil inlet hole and the operation chamber, which can ensure that the fuel reaches the bearing of the drive shaft to be tested evenly and stably, highly restoring the actual lubrication path and state of the bearing in the aero-engine. The oil return hole and the oil return pipe cooperate to smoothly return the lubricating fuel in the operation chamber to the oil pump, forming a complete and smooth circulation system. Through the design of simulating the real lubrication working condition, it provides a strong guarantee for accurately testing the performance of the bearing under actual lubrication conditions, making the test results more valuable for reference and helping the R & D personnel to more accurately evaluate and improve the lubrication performance of the bearing. At the same time, in the above technology, the operation chamber and the high-temperature gas passage are isolated through the outer peripheral wall of the heat conductor to prevent gas or fuel from overflowing from each other, thereby improving the test safety.

[0014] The present invention is further configured as follows: The loading structure includes an axial loading hydraulic cylinder arranged on the tooling base and a radial loading hydraulic cylinder arranged on the tooling base. Load sensors are arranged on the output ends of both the axial loading hydraulic cylinder and the radial loading hydraulic cylinder. A first force-bearing shaft for passing through the sealing plate is opened on the partition plate close to the heat conductor, and the first force-bearing shaft is coaxially arranged with the output end of the axial loading hydraulic cylinder. A first linkage shaft is arranged on the output end of the axial loading hydraulic cylinder for applying a load to the first force-bearing shaft when the axial loading hydraulic cylinder operates to apply an axial load to the drive shaft. A loading hole is opened on the tooling base, and a second force-bearing shaft is movably arranged in the loading hole. A second linkage shaft is arranged on the output end of the radial loading hydraulic cylinder for applying a load to the second force-bearing shaft when the radial loading hydraulic cylinder operates to apply a radial load to the drive shaft.

[0015] The advantages of adopting the above technical solution are as follows: In the above technology, the loading structure is respectively provided with an axial loading hydraulic cylinder and a radial loading hydraulic cylinder, which can independently and accurately apply axial and radial loads to the drive shaft. The axial loading hydraulic cylinder cooperates with the first force-bearing shaft through the first linkage shaft, and the radial loading hydraulic cylinder collaborates with the second force-bearing shaft by using the second linkage shaft, which can precisely control the magnitude and direction of the applied force. At the same time, the load sensor monitors the loading force in real time to ensure the accuracy and stability of the loading process. Through the precise load application method, it highly simulates the force-bearing situation of the aero-engine drive shaft bearing during actual operation, providing necessary conditions for accurately testing the bearing performance and making the test results more reflective of the bearing's performance under real working conditions, greatly improving the test accuracy. In the above technology, to ensure the stability and service life of the axial loading hydraulic cylinder and the radial loading hydraulic cylinder, heat insulation sleeves can be wrapped around the ends of the first force-bearing shaft and the second force-bearing shaft to prevent damage to the loading equipment caused by excessive heat.

[0016] The present invention is further provided that: two groups of test bearings are installed on the transmission shaft, the two groups of test bearings are arranged opposite to each other and preload rings are sleeved on the two groups of test bearings, the outer peripheral wall of the preload ring is a force-bearing surface for abutting and fitting with the end of the second force-bearing shaft, and a preload spring is arranged between the two groups of test bearings.

[0017] The advantages of adopting the above technical solution are as follows: in the above technology, two sets of test bearings arranged opposite to each other are installed on the transmission shaft, and a preload ring is sleeved, and the outer peripheral wall thereof serves as the abutting and matching force surface of the end of the second force-bearing shaft, which can accurately transmit the radial load applied by the radial loading cylinder, and the preload spring is arranged between the two sets of test bearings, which can simulate the axial preload force borne by the bearings of the aircraft engine transmission shaft in actual operation, so that during the test, the force environment of the transmission shaft bearing to be tested is closer to the actual working state, and its performance under complex load conditions can be tested more accurately, which greatly improves the accuracy and effectiveness of the test results, and provides strong support for in-depth research on the performance of the bearing under actual working conditions; the coordinated work of the test bearing, the preload ring and the preload spring helps to maintain the stable operation of the transmission shaft during the test, and the preload spring continuously provides a stable axial preload for the test bearing to prevent the bearing from axial movement during operation; the preload ring evenly distributes the radial load to the test bearing, ensures the balance of radial force, and avoids the radial load directly acting on the transmission shaft to cause damage to the transmission shaft.

[0018] The present invention is further provided that: the driving structure includes a driving seat arranged on the test bench and a high-speed electric spindle arranged on the driving seat, the output end of the high-speed electric spindle is coaxial with the transmission shaft and is arranged in linkage, a guide shaft is connected between the driving seat and the tooling seat, and the guide shaft is arranged parallel to the transmission shaft.

[0019] The benefits of adopting the above technical solution are: the driving structure in the above technology adopts a high-speed electric spindle arranged on the test bench, and its output end is coaxial with the transmission shaft and works in linkage, which can provide stable and efficient power output for the transmission shaft, so that the transmission shaft bearing to be tested can be tested under operating conditions close to the actual operating conditions, which greatly improves the accuracy and reliability of the test results, and provides a strong guarantee for in-depth research on the performance of bearings under actual operating conditions; and a guide shaft arranged parallel to the transmission shaft is connected between the driving seat and the tooling seat, and the guide shaft can limit the displacement of the driving seat and the tooling seat, prevent the transmission shaft from being offset or shaking due to vibration or uneven force, ensure the stability and accuracy of power transmission, and thereby improve the coaxial rate; the high-speed electric spindle in the above technology is a prior art, so its structure and function will not be described in detail.

[0020] The present invention further provides that: the transmission shaft is a hollow transmission shaft.

[0021] The advantages of adopting the above technical solution are as follows: In the above technology, the transmission shaft is a hollow transmission shaft, which makes the weight of the transmission shaft light, so as to meet the actual operating conditions of the bearing. At the same time, when the transmission shaft of the bearing of the aero-engine is actually operating, the transmission shaft is a thin-walled shaft body. Therefore, the transmission shaft is designed as a hollow transmission shaft, which further conforms to the actual operating conditions of the bearing.

[0022] The present invention is further provided with: a first opening for communicating with an external pressure relief valve and a second opening for cooperating with an external air pressure sensor are formed on one side of the tooling seat, and a shock-absorbing and heat-insulating plate is connected between the top wall of the test bench and the loading seat.

[0023] The advantages of adopting the above technical solution are as follows: In the above technology, the second opening is connected to the air pressure sensor to detect and give an early warning and alarm when the air pressure value in the cavity is too high. As a further safety measure, the first opening is connected to the pressure relief valve. When an accident occurs and fuel burns rapidly in the test cavity, a large amount of gas is quickly discharged to relieve pressure and prevent explosion; in the above technology, the setting of the shock-absorbing and heat-insulating plate plays a role in shock absorption and heat insulation, thereby preventing the test bench from being damaged or scrapped during a long-term test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional view of the present invention;

[0025] Figure 2 It is a three-dimensional view of the test bench and its linkage structure in the present invention;

[0026] Figure 3 It is Figure 2 a side cross-sectional view of;

[0027] Figure 4 It is a three-dimensional view of the tooling seat in the present invention;

[0028] Figure 5 It is Figure 4 a side cross-sectional view of, where the direction indicated by arrow A is the temperature change direction, that is, it is shown that the temperature gradually decreases from the end of the line to the direction of the arrow;

[0029] Figure 6 It is a three-dimensional view of the heat conductor in the present invention;

[0030] Figure 7 It is Figure 6 a schematic diagram of a radial cross-section along the axis of the heat conductor and the cross-section position is close to the air inlet;

[0031] Figure 8 It is Figure 6 a schematic diagram of a radial cross-section along the axis of the heat conductor and the cross-section position is in the middle of the heat conductor;

[0032] Figure 9 It is Figure 6Schematic diagram of a radial cross-section along the axis of the heat conductor and at a position far from the air inlet;

[0033] Figure 10 is Figure 6 simple sectional view;

[0034] Figure 11 is Figure 6 simple perspective view;

[0035] Figure 12 Front view of the test bench and its linkage structure in the present invention. Specific implementation manner

[0036] The present invention provides a high-temperature fuel lubrication test device for the bearings of an aero-engine transmission shaft 21, including a test machine case 1 and a test bench 11 arranged inside the test machine case 1. A tooling seat 2 and a transmission shaft 21 are arranged on the test bench 11. An installation hole 22 is formed in the tooling seat 2 for the transmission shaft 21 to pass through and cooperate with the transmission shaft 21 for the installation of the bearings of the transmission shaft 21 to be tested outside. A lubrication simulation structure is arranged on the tooling seat 2 for communicating with an external oil pump to enable the oil pump to transport lubricating fuel into the installation hole 22 and form an oil transmission channel to simulate the actual lubrication working condition of the bearings, and a high-temperature simulation structure is arranged for communicating with an external air pump to form a high-temperature gas channel 36 and heating the installation hole 22 by the high-temperature gas transported by the air pump to simulate the actual high-temperature working condition of the bearings. A loading structure is arranged on the test bench 11 for applying axial and radial loads to the bearings of the transmission shaft 21 to be tested, and a driving structure is arranged for driving the transmission shaft 21 to rotate to simulate the actual operating condition of the bearings. An installation groove 221 is circumferentially formed on the inner peripheral wall of the installation hole 22. The high-temperature simulation structure includes a heat-conducting body 3 arranged in the installation groove 221. The radial cross-section of the heat-conducting body 3 is annularly arranged and its axial hole is coaxially arranged with the installation hole 22. A tooling sleeve 31 is arranged in the axial hole of the heat-conducting body 3. The tooling sleeve 31 is sleeved on the transmission shaft 21 and a mounting gap for installing the bearings of the transmission shaft 21 to be tested is formed by the clearance fit between the inner peripheral wall of the tooling sleeve 31 and the outer peripheral wall of the transmission shaft 21. The high-temperature gas channel 36 is formed in the heat-conducting body 3. An air inlet hole 32 for communicating with the air outlet end of an external air pump and an air outlet hole 33 for communicating with the air return end of an external air pump are formed in the heat-conducting body 3. Both the air inlet hole 32 and the air outlet hole 33 are communicated with the high-temperature gas channel 36. Sealing plates 23 are detachably connected to both ends of the tooling seat 2. Air ports 231 for cooperating with the air pump for transmitting high-temperature gas are formed in the sealing plate 23 close to the heat-conducting body 3 at positions corresponding to the air inlet hole 32 and the air outlet hole 33. An isolation assembly is arranged on the tooling seat 2 for closing the installation hole 22 and combining with the mounting gap to form an operation chamber 24. The isolation assembly is composed of two partition plates 241 respectively arranged at the openings at both ends of the installation hole 22. Both ends of the heat-conducting body 3 are abutted against the inner wall of the adjacent sealing plate 23 and the inner wall of the installation groove 221 respectively. A plurality of first ventilation holes 34 penetrate through the heat-conducting body 3 along its axial direction. Along the axial direction of the heat-conducting body 3 and at positions corresponding to one side of each first ventilation hole 34, a plurality of second ventilation holes 35 penetrate through. The end of each first ventilation hole 34 is communicated with the start end of its corresponding second ventilation hole 35. The end of each second ventilation hole 35 is communicated with the start end of its adjacent first ventilation hole 34. The combination of the plurality of first ventilation holes 34 and the plurality of second ventilation holes 35 forms the high-temperature gas channel 36. Any one of the first ventilation holes 34 is communicated with the air inlet hole 32, and any one of the second ventilation holes 35 is communicated with the air outlet hole 33.The tooling seat 2 is provided with a temperature measuring hole 25 for cooperating with an external sensing device to detect the temperature of the tooling seat 2, and the heat conductor 3 is provided with a vibration measuring hole 26 for cooperating with an external sensing device to detect the vibration amplitude and vibration frequency of the bearing of the transmission shaft 21 to be tested during the test. The lubrication simulation structure includes an oil inlet hole 27 for communicating with the output end of an external oil pump so that the lubricating fuel delivered by the oil pump can be poured into the operating chamber 24, and an oil return pipe 28 for communicating with the input end of the external oil pump so that the lubricating fuel in the operating chamber 24 can return to the oil pump. The oil inlet hole 27 is provided on the tooling seat 2 and a lubricating oil passage 271 for communicating with the oil inlet hole 27 is provided on the tooling sleeve 31. The lubricating oil The oil return pipe 271 is connected to the running chamber 24, and the tooling seat 2 is provided with an oil return hole 281 connected to the running chamber 24. The oil return pipe 28 is arranged in the test bench 11 and its end passes through the test bench 11 and is connected to the oil return hole 281. The loading structure includes an axial loading hydraulic cylinder 4 arranged on the tooling seat 2 and a radial loading hydraulic cylinder 5 arranged on the tooling seat 2. The output ends of the axial loading hydraulic cylinder 4 and the radial loading hydraulic cylinder 5 are both provided with load sensors 41. A first force-bearing shaft 42 for passing through the sealing plate 23 is provided on the partition 241 close to the heat conductor 3. The first force-bearing shaft 42 is coaxially arranged with the output end of the axial loading hydraulic cylinder 4. The output end of the pressure cylinder 4 is provided with a first linkage shaft 411 for applying a load to the first force-bearing shaft 42 when the axial loading hydraulic cylinder 4 is running so as to apply an axial load to the transmission shaft 21. The tooling seat 2 is provided with a loading hole 29, and a second force-bearing shaft 51 is movably arranged in the loading hole 29. The output end of the radial loading hydraulic cylinder 5 is provided with a second linkage shaft 52 for applying a load to the second force-bearing shaft 51 when the radial loading hydraulic cylinder 5 is running so as to apply a radial load to the transmission shaft 21. Two groups of test bearings 53 are installed on the transmission shaft 21. The two groups of test bearings 53 are arranged opposite to each other and the two groups of test bearings 53 are sleeved with preload rings 54. The outer peripheral wall of the preload ring 54 is for the second force-bearing shaft 5 1 end abuts against the force-bearing surface, a preload spring 55 is arranged between the two groups of the accompanying test bearings 53, the driving structure includes a driving seat 6 arranged on the test bench 11 and a high-speed electric spindle 61 arranged on the driving seat 6, the output end of the high-speed electric spindle 61 is coaxial with the transmission shaft 21 and is arranged in linkage, a guide shaft 62 is connected between the driving seat 6 and the tooling seat 2, the guide shaft 62 is arranged parallel to the transmission shaft 21, and the transmission shaft 21 is a hollow transmission shaft, a first opening 7 for communicating with an external pressure relief valve and a second opening 72 for cooperating with an external air pressure sensor are opened on one side of the tooling seat 2, and a shock-absorbing heat-insulating plate 73 is connected between the top wall of the test bench 11 and the loading seat. ,

[0037] The identification of the bearing to be tested in the above-mentioned technology in the specification drawings is 8, the identification of the air extraction system in the specification drawings is 74, and the identification of the air conditioning system in the specification drawings is 75.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An aviation engine transmission shaft bearing high-temperature fuel lubrication test device, characterized in that: It includes a test case and a test bench arranged inside the test case, wherein the test bench is provided with a tooling seat and a transmission shaft, the tooling seat is provided with a mounting hole for the transmission shaft to pass through and cooperate with the transmission shaft for the installation of an external transmission shaft bearing to be tested, the tooling seat is provided with a lubrication simulation structure for connecting with an external oil pump so that the oil pump delivers lubricating fuel to the mounting hole and forms an oil delivery channel to simulate the actual lubrication condition of the bearing, and a high-temperature simulation structure for connecting with an external air pump to form a high-temperature gas channel and heating the mounting hole with the high-temperature gas delivered by the air pump to simulate the actual high-temperature condition of the bearing, and the test bench is provided with a loading structure for applying a radial shaft load to the transmission shaft bearing to be tested and a driving structure for driving the transmission shaft to operate to simulate the actual operating condition of the bearing.

2. The high-temperature fuel lubrication test equipment for an aero-engine transmission shaft bearing according to claim 1, wherein: An installation groove is provided in an annular direction on the inner peripheral wall of the installation hole, and the high-temperature simulation structure includes a heat conductor arranged in the installation groove, the radial cross-section of the heat conductor is annular and its axial hole is coaxially arranged with the installation hole, a tooling sleeve is provided in the axial hole of the heat conductor, the tooling sleeve is sleeved on the transmission shaft, and the inner peripheral wall of the tooling sleeve and the outer peripheral wall of the transmission shaft are gap-matched to form an installation gap for the installation of the transmission shaft bearing to be tested, the high-temperature gas channel is provided on the heat conductor, and an air inlet hole for communicating with the air outlet end of the external air pump and an air outlet hole for communicating with the air return end of the external air pump are provided on the heat conductor, and the air inlet hole and the air outlet hole are both connected with the high-temperature gas channel, and sealing plates are detachably connected at both ends of the tooling seat, and gas ports for cooperating with the air pump for high-temperature gas transmission are provided on the sealing plate close to the heat conductor at the positions corresponding to the air inlet hole and the air outlet hole, and an isolation component for closing the installation hole and combining with the installation gap to form an operating chamber is provided on the tooling seat, and the isolation component is composed of two partitions respectively arranged at the openings at both ends of the installation hole.

3. An aviation engine transmission shaft bearing high-temperature fuel lubrication test device according to claim 2, characterized in that: The two ends of the heat conductor are respectively abutted against the inner wall of the adjacent sealing plate and the inner wall of the mounting groove, the heat conductor is penetrated by a plurality of first air holes along its axial direction, the heat conductor is penetrated by second air holes along its axial direction and at a position corresponding to one side of each first air hole, each end of the first air hole is connected to the starting end of the corresponding second air hole, each end of the second air hole is connected to the starting end of the adjacent first air hole, a combination of the first air holes and the second air holes forms a high-temperature gas channel, any one of the first air holes is connected to the air inlet, and any one of the second air holes is connected to the air outlet.

4. An aviation engine transmission shaft bearing high-temperature fuel lubrication test device according to claim 2, characterized in that: The tooling seat is provided with a temperature measuring hole for cooperating with an external sensing device to detect the temperature of the tooling seat, and the heat conductor is provided with a vibration measuring hole for cooperating with an external sensing device to detect the vibration amplitude and vibration frequency of the transmission shaft bearing to be tested during the test.

5. An aviation engine transmission shaft bearing high-temperature fuel lubrication test device according to claim 2, characterized in that: The lubrication simulation structure includes an oil inlet hole for connecting with the output end of an external oil pump so that the lubricating fuel delivered by the oil pump can be poured into the operating chamber, and an oil return pipe for connecting with the input end of an external oil pump so that the lubricating fuel in the operating chamber can be returned to the oil pump. The oil inlet hole is provided on a tooling seat, and a lubricating oil passage for connecting with the oil inlet hole is provided on the tooling sleeve. The lubricating oil passage is connected with the operating chamber, and an oil return hole connected with the operating chamber is provided on the tooling seat. The oil return pipe is provided in the test bench, and an end thereof passes through the test bench and is connected with the oil return hole.

6. The high-temperature fuel lubrication test equipment for the transmission shaft bearing of an aeroengine according to claim 2, wherein: The loading structure includes an axial loading hydraulic cylinder and a radial loading hydraulic cylinder arranged on the workbench, and load sensors are arranged on the output ends of the axial loading hydraulic cylinder and the radial loading hydraulic cylinder. A first force-bearing shaft for penetrating the sealing plate is provided on the partition close to the heat conductor, and the first force-bearing shaft is coaxially arranged with the output end of the axial loading hydraulic cylinder. A first linkage shaft for applying a load to the first force-bearing shaft when the axial loading hydraulic cylinder is running so as to apply an axial load to the transmission shaft is provided on the output end of the axial loading hydraulic cylinder. A loading hole is provided on the workbench, and a second force-bearing shaft is movably arranged in the loading hole. A second linkage shaft for applying a load to the second force-bearing shaft when the radial loading hydraulic cylinder is running so as to apply a radial load to the transmission shaft is provided on the output end of the radial loading hydraulic cylinder.

7. An aviation engine transmission shaft bearing high-temperature fuel lubrication test device according to claim 6, characterized in that: Two groups of test bearings are installed on the transmission shaft. The two groups of test bearings are arranged opposite to each other and are sleeved with preload rings. The outer peripheral wall of the preload ring is a force-bearing surface for abutting and fitting with the end of the second force-bearing shaft. A preload spring is arranged between the two groups of test bearings.

8. An aviation engine transmission shaft bearing high-temperature fuel lubrication test device according to claim 1, characterized in that: The driving structure includes a driving seat arranged on the test bench and a high-speed electric spindle arranged on the driving seat. The output end of the high-speed electric spindle is coaxial with the transmission shaft and is arranged in linkage. A guide shaft is connected between the driving seat and the tooling seat, and the guide shaft is arranged parallel to the transmission shaft.

9. The high-temperature fuel lubrication test equipment for an aero-engine transmission shaft bearing according to claim 1, characterized in that: The transmission shaft is a hollow transmission shaft.

10. An aviation engine transmission shaft bearing high-temperature fuel lubrication test device according to claim 1, characterized in that: A first opening for communicating with an external pressure relief valve and a second opening for cooperating with an external air pressure sensor are provided on one side of the tooling seat, and a shock-absorbing and heat-insulating plate is connected between the top wall of the test bench and the loading seat.

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