Vertical rotor structure for large diameter casing containment test

Abstract

The present invention provides a vertical rotor structure for large-diameter casing containment testing. This structure comprises a rotor, a thrust assembly, a drive unit, a belt drive mechanism, and a multi-bearing support mechanism. The thrust assembly connects the rotor to the test blades via a thrust head, a locking sleeve, and a fan disc. The belt drive mechanism drives the rotor's rotation, and the multi-bearing support mechanism defines the rotor's radial position at multiple locations. This novel vertical rotor structure is suitable for large-diameter aircraft engine casing containment testing and offers excellent stability.

Description

Technical Field

[0001] The invention relates to an aviation device testing apparatus, in particular to a vertical rotor structure for a large-diameter aviation engine casing containment test. Background Art

[0002] Aircraft engine rotor blades operate in harsh environments, exposed to high speeds and high stresses, and are at risk of breaking and flying. While the probability of this happening is low, the consequences could be catastrophic. In particular, if blade fragments penetrate the casing and cause uncontained failure, penetrating the fuselage, fuel tank, or other components, this could lead to a major accident, resulting in economic losses and casualties. Therefore, aircraft engine casings must be sufficiently contained to prevent rotor blades from flying and causing damage to the aircraft.

[0003] The fan blade flying-off test is an essential part of assessing the containment of the casing. When the engine runs at the highest speed, the fan blades are broken and impact the casing, thereby verifying the containment of the casing.

[0004] Currently, most rotor structures used in domestic casing containment tests utilize a horizontal structure. These test devices are affected by the disturbances generated by the weight of the test piece's long cantilever and the size of the bearing housing, making them applicable only to the containment testing of small-diameter aircraft engine casings. As aircraft engine sizes increase, conventional rotor structures used in casing containment tests are unable to meet testing requirements. Summary of the Invention

[0005] Based on this, it is necessary to provide a vertical rotor structure for large-diameter casing containment testing.

[0006] The present invention adopts the following technical solutions:

[0007] The present invention provides a vertical rotor structure for a large-diameter casing containment test, comprising a rotor, a thrust assembly, a drive device, a belt transmission mechanism, and a multi-bearing support mechanism: the thrust assembly comprises a locking sleeve, a thrust head, and a fan disk; the thrust head is arranged at the top section of the rotor through the locking sleeve; the fan disk is connected to the thrust head and is used to install a blade to be tested; the belt transmission mechanism comprises a rotor multi-wedge structure, a pulley, and a gearbox; the rotor multi-wedge structure is arranged at the middle and bottom section of the rotor; the pulley is connected to the gearbox and the rotor multi-wedge structure; the gearbox is connected to the drive device and is used to transmit and drive the rotor to rotate; the multi-bearing support mechanism comprises a thrust bearing and a ball bearing; the thrust bearing is used to support the end face of the thrust head and limit the axial displacement of the rotor; the ball bearing is sleeved on the bottom section of the rotor to limit the radial runout of the rotor.

[0008] In some embodiments, the multi-bearing support mechanism further includes a first sliding bearing disposed on an outer circumference of the thrust head for limiting the radial position of the thrust head. The multi-bearing support mechanism further includes a second sliding bearing disposed in a central section of the rotor, between the thrust head and the rotor multi-wedge structure, for limiting the radial position of the rotor.

[0009] In some embodiments, the vertical rotor structure for large-diameter casing containment testing further includes an immersion lubrication mechanism, which is disposed around the first sliding bearing and / or the second sliding bearing.

[0010] Specifically, the lubrication mechanism includes an oil tank, a heat exchanger and a circulating water pipeline; the oil tank covers the bearings of the multi-bearing support mechanism and immerses them in lubricating oil. The oil tank adopts a contact oil block to prevent the lubricating oil from leaking as the rotor rotates; the heat exchanger is arranged in the oil tank and connected to the circulating water pipeline to cool the lubricating oil.

[0011] In some embodiments, the thrust assembly preferably further includes a connection disk, and the fan disk and the thrust head are connected via the connection disk.

[0012] In some embodiments, the expansion sleeve is preferably made of a non-metallic material, and its strength is less than that of the thrust head. The strength of the thrust head is less than that of the rotor.

[0013] In some embodiments, the driving device is a motor.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The vertical rotor structure for large-diameter casing containment testing of the present invention is mainly composed of a thrust assembly, a drive torque belt transmission mechanism, a multi-bearing support mechanism, and an immersion lubrication mechanism. The rotor structure adopts a rigid vertical rotor structure, which can be used to test more rotating diameter test pieces and is not affected by the disturbance caused by the long cantilever weight of the test piece. The connection between the thrust head and the rotor adopts a non-metallic expansion sleeve structure. The thrust head and the expansion sleeve can absorb the impact force generated during the test, effectively protecting the rotor. It is also easy to disassemble and assemble, making it convenient to replace the thrust head. The transmission of the motor torque adopts a belt structure, which not only reduces the requirements for installation and positioning accuracy, but also acts as a buffer, absorbing the impact force generated by the test, and effectively protecting the drive motor. The rotor adopts a multi-bearing support mechanism, which can improve the support rigidity, allowing the rotor to vibrate to a certain extent under the high-speed rotation state during the test, making the rotor rotate more smoothly, and can also resist the impact force generated during the test, support the preload force generated by the belt structure, and reduce the slip of the belt drive structure. The immersion lubrication method is adopted to keep the bearings and shaft necks immersed in lubricating oil at all times, and will not damage the bearing shells due to lack of oil film. The vertical rotor structure for the large-diameter casing containment test of the present invention has good stability and can meet the requirements of the large-diameter casing containment test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a one-view structural schematic diagram of the vertical rotor structure used for large-diameter casing containment testing.

[0017] Figure 2 for Figure 1 Another perspective structural diagram of the vertical rotor structure used for large-diameter casing containment testing.

[0018] Some of the components in the figure are numbered as follows:

[0019] 10. Rotor, 11. Fan disc, 12. Connecting disc, 13. Expansion sleeve, 14. Thrust head, 21. Rotor PL multi-wedge structure, 22. Pulley, 23. Gearbox, 24. Motor, 31. First sliding bearing, 32. Thrust bearing, 33. Second sliding bearing, 34. Ball bearing, 41. First contact oil stop, 42. First circulating water inlet pipe, 43. First circulating water return pipe, 44. First annular heat exchanger, 45. First oil tank, 46. Second contact oil stop, 47. Second circulating water inlet pipe, 48. Second circulating water return pipe, 49. Second annular heat exchanger, 50. Second oil tank. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with specific embodiments so that those skilled in the art can more clearly understand the present invention. The following embodiments are only used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Based on the specific embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0022] like Figure 1 and 2 As shown, a vertical rotor structure for large-diameter (3000 mm and above) casing containment test in one embodiment includes a rotor 10, a thrust assembly, a drive motor 24, a belt transmission mechanism and a multi-bearing support mechanism.

[0023] In this embodiment, the thrust assembly includes a fan disc 11, a connecting disc 12, a locking sleeve 13, and a thrust head 14. The thrust head 14 is mounted on the top section of the rotor 10 via the locking sleeve 13, and the connecting disc 12 is mounted on top of the thrust head 14. Bolts fasten the thrust head 14 and rotor 10, respectively, to limit axial displacement between the thrust head 14 and rotor 10. The fan disc 11 is connected to the locking sleeve 12 for mounting the blade to be tested.

[0024] Preferably, the expansion sleeve 13 is made of a non-metallic material with a strength lower than that of the thrust head 14. The thrust head 14 is also weaker than the rotor 10. Furthermore, the expansion sleeve 13 is easily disassembled and assembled, facilitating replacement of the thrust head 14. The thrust assembly can withstand the large instantaneous radial impact forces during testing, thereby protecting the rotor 10 from damage.

[0025] In this embodiment, the belt drive mechanism includes a rotor PL multi-wedge structure 21, a pulley 22, and a gearbox 23. The rotor PL multi-wedge structure 21 is located in the middle and bottom section of the rotor 10. The pulley 22 connects the gearbox 23 and the rotor PL multi-wedge structure 21. The gearbox 23 is connected to a drive motor 24, which drives the rotor 10 in rotation. The torque of the motor 24 is transmitted to the gearbox 23 via a shaft. A pulley with a PL multi-wedge structure within the gearbox 23 is connected to the pulley 22. The other end of the pulley 22 is connected to the rotor PL multi-wedge structure 21 on the rotor, transmitting the driving torque to the rotor 10, driving its rotation.

[0026] The use of a belt drive structure not only reduces the requirements for installation and positioning accuracy, but also acts as a buffer, absorbing the impact force generated by the test and effectively protecting the drive motor 24. The belt drive mechanism can withstand the torque transmission of a high-power motor, and when the rotor is subjected to large instantaneous impact forces during the test, the impact energy will not damage the gearbox 23 and the drive motor 24.

[0027] In this embodiment, the multi-bearing support mechanism includes a first sliding bearing 31, a thrust bearing 32, a second sliding bearing 33, and a ball bearing 34. The thrust bearing 32 and the ball bearing 34 are respectively provided at both end sections of the rotor 10.

[0028] The thrust bearing 32 is composed of multiple tilting pads to support the end face of the thrust head 14 and limit the axial displacement of the rotor 10. The thrust bearing 32 structure uses multiple tilting pads to assist in supporting the rotor 10 and reduce vibration caused by imbalance.

[0029] A self-aligning ball bearing 34, mounted on the bottom section of rotor 10, limits radial runout of rotor 10, supports the preload generated by the belt structure, and reduces slippage in the belt drive. Ball bearing 34 utilizes a self-aligning ball bearing, providing a rigid support that limits radial runout of the rotor and reduces slippage in the belt drive by generating preload. Sliding bearings are used in the upper and middle sections of rotor 10, preventing the rotor's axis from being completely fixed during high-speed rotation, resulting in a certain degree of angular deviation. The self-aligning ball bearing structure accommodates the angular motion of the rotor structure's axis with certain deviations.

[0030] Both the first sliding bearing 31 and the second sliding bearing 33 are tilting pad sliding bearings. The first sliding bearing 31 is located on the outer circumference of the thrust head 14 to limit the radial position of the thrust head 14. The second sliding bearing 33 is located in the central section of the rotor 10, between the thrust head 14 and the rotor PL multi-wedge structure 21, to limit the radial position of the rotor 10. It uses multiple tilting pads.

[0031] In this embodiment, the multi-bearing support mechanism adopts a support structure of three radial bearings and one thrust bearing. Both sliding bearings adopt a multi-block tilting bearing structure. There is an oil film between the bearing and the journal, and the support rigidity increases as the thickness of the oil film becomes thinner. During the test, the vibration caused by the imbalance of the rotor 10 at high speed will generate pressure on the oil film, and the oil film will support the rotor 10. As the vibration of the rotor increases, the oil film will become thinner, thereby increasing the support rigidity, so that the vibration of the rotor will not affect the production of the bearing itself. The test device has a high tolerance for rotor vibration, and the sliding bearing can withstand higher linear speeds of the rotor. It is used for rotors with larger diameters, and the sliding bearing has higher support rigidity, which can effectively resist the impact force generated during the test and effectively protect the entire rotor system.

[0032] In this embodiment, the lubrication mechanism includes an oil tank, a heat exchanger, and a circulating water pipeline. The oil tank covers the bearings of the multi-bearing support mechanism and immerses them in lubricating oil. The oil tank uses a contact oil stop to prevent the lubricating oil from leaking as the rotor rotates. The heat exchanger is located in the oil tank and connected to the circulating water pipeline to cool the lubricating oil.

[0033] Specifically, the lubrication mechanism is an immersion lubrication mechanism, including two sets of lubrication and cooling mechanisms. Immersion lubrication keeps the bearings and journals immersed in lubricating oil at all times, ensuring a stable oil film. In the event of an unexpected oil system shutdown, the bearings will not be damaged due to lack of oil film.

[0034] The first lubrication and cooling mechanism is arranged around the first sliding bearing 31 and thrust bearing 32 and includes a first oil tank 45, a first contact oil stop 41, a first annular heat exchanger 44, a first circulating water inlet pipe 42, and a first circulating water return pipe 43. The first circulating water inlet pipe 42 and the first circulating water return pipe 43 are connected to the annular heat exchanger 44 and placed in the first oil tank 45. The lubricating oil in the first oil tank 45 is cooled by an external circulating water system. The first tilting pad sliding bearing 31 and the thrust bearing 32 are placed in the first oil tank 45, filled with lubricating oil to submerge the bearings, ensuring that the bearings are always immersed in the lubricating oil. A first contact oil stop 41 is installed above the first oil tank 45 to prevent the lubricating oil from leaking along the outer surface of the rotor during high-speed rotation.

[0035] The second lubrication and cooling mechanism includes a second oil tank 50, a second contact oil stop 46, a second annular heat exchanger 49, a second circulating water inlet pipe 47, and a second circulating water return pipe 48. The second annular heat exchanger 49 is placed in the second oil tank 50, and the lubricating oil in the second oil tank 50 is cooled by an external circulating water system. The second tilting pad sliding bearing 34 is placed in the second oil tank 50 and filled with lubricating oil to submerge the bearing, ensuring it remains submerged. A second contact oil stop 46 is located above the second oil tank 50 to prevent lubricating oil from leaking out along the outer surface of the rotor during high-speed rotation.

[0036] The vertical rotor structure of the large-diameter casing containment test in this embodiment is composed of a thrust head structure, a drive torque belt transmission structure, a multi-bearing support structure, an immersion lubrication structure, etc. The overall characteristics and advantages are reflected in:

[0037] The rotor structure contemplated by the present invention utilizes a rigid vertical rotor structure, enabling testing of test pieces with a wider range of rotating diameters without being affected by the disturbances caused by the weight of the test piece's long cantilever. The upper bearing utilizes a thrust head structure, and the connection between the thrust head 14 and the rotor 10 utilizes a non-metallic expansion sleeve 13. The thrust head 14 and expansion sleeve 13 absorb the impact forces generated during testing, effectively protecting the rotor 10. They also facilitate assembly and disassembly, facilitating thrust head replacement. The torque transmission of the motor 24 utilizes a belt structure, which not only reduces the requirements for installation and positioning accuracy but also acts as a buffer, absorbing the impact forces generated during testing and effectively protecting the drive motor. The rotor 10 utilizes a three-bearing support structure, with the upper and middle bearing seats utilizing tilting pad sliding bearings. This improves support rigidity, allowing for some vibration at high speeds during testing, ensuring smoother rotor rotation, and resisting impact forces generated during testing. The lower bearing utilizes a self-aligning ball bearing, which limits radial rotor runout, supports the preload generated by the belt structure, and reduces slippage in the belt drive. The upper and middle sliding bearings use immersion lubrication, which keeps the bearings and journals immersed in lubricating oil at all times, preventing the bearing shells from being damaged due to lack of oil film.

[0038] It is important to note that the above embodiments are intended only to further illustrate and describe the technical solutions of the present invention and are not intended to further limit the technical solutions of the present invention. The methods of the present invention are merely preferred implementations and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A vertical rotor structure for large diameter casing containment test, characterized in that: It includes a rotor, a thrust assembly, a drive device, a belt transmission mechanism, and a multi-bearing support mechanism: the thrust assembly includes a locking sleeve, a thrust head, and a fan disc. The thrust head is arranged at the top section of the rotor through the locking sleeve. The fan disc is connected to the thrust head and is used to install the blade to be tested. The belt transmission mechanism includes a rotor multi-wedge structure, a pulley, and a gearbox. The rotor multi-wedge structure is arranged at the middle and bottom section of the rotor. The pulley is connected to the gearbox and the rotor multi-wedge structure. The gearbox is connected to the drive device to drive the rotor to rotate. The multi-bearing support mechanism includes a thrust bearing and a ball bearing. The thrust bearing is used to support the end face of the thrust head and limit the axial displacement of the rotor. The ball bearing is mounted on the bottom end section of the rotor to limit the radial runout of the rotor. The multi-bearing support mechanism also includes a first sliding bearing, which is arranged on the outer circumference of the thrust head and is used to limit the radial position of the thrust head. The multi-bearing support mechanism also includes a second sliding bearing, which is arranged in the middle section of the rotor, located between the thrust head and the rotor multi-wedge structure, and is used to limit the radial position of the rotor.

2. The vertical rotor structure for large diameter casing containment test according to claim 1 is characterized in that: The sliding bearings in the multi-bearing support mechanism are tilting pad sliding bearings.

3. The vertical rotor structure for large diameter casing containment test according to claim 2, characterized in that: The invention further comprises a lubricating mechanism, which is arranged at least around the first sliding bearing and / or the second sliding bearing.

4. The vertical rotor structure for large diameter casing containment test according to claim 3, characterized in that: The lubrication mechanism includes an oil tank, a heat exchanger and a circulating water pipeline; the oil tank covers the bearings of the multi-bearing support mechanism and immerses them in lubricating oil. The oil tank adopts a contact oil block to prevent the lubricating oil from leaking as the rotor rotates; the heat exchanger is arranged in the oil tank and connected to the circulating water pipeline to cool the lubricating oil.

5. The vertical rotor structure for large diameter casing containment test according to claim 1, characterized in that: The thrust assembly further includes a connecting disk, and the fan disk and the thrust head are connected via the connecting disk.

6. The vertical rotor structure for large diameter casing containment test according to claim 1, characterized in that: The expansion sleeve is made of non-metallic material and has a strength lower than that of the thrust head.

7. The vertical rotor structure for large diameter casing containment test according to claim 6, characterized in that: The strength of the thrust head is smaller than the strength of the rotor.

8. The vertical rotor structure for large diameter casing containment test according to claim 1, characterized in that: The driving device is a motor.

Images