Compact space shared bearing cavity structure and aircraft engine having the same

Abstract

The present invention discloses a compact space shared bearing cavity structure and an aircraft engine having the same, comprising: a central shaft, a bearing seat, a bearing spring support, an oil injection ring, a high-pressure side mounting seal integration and a low-pressure side mounting seal integration, a high-pressure bearing and a low-pressure bearing. The high-pressure side mounting seal integration is also sealed and connected to the high-pressure end of the bearing seat to form a high-pressure side sealing end, and the low-pressure side mounting seal integration is also sealed and connected to the low-pressure end of the bearing seat to form a low-pressure side sealing end. The sealing inner ring located on the inner side of the oil injection ring is also sealed and connected to the inner ring of the high-pressure side mounting seal integration and the inner ring of the low-pressure side mounting seal integration respectively. A lubricating oil delivery channel is also provided in the compact space shared bearing cavity structure, and the lubricating oil delivery channel is used to introduce external lubricating oil to lubricate the high-pressure bearing and the low-pressure bearing under the ring respectively. The structure of the present invention can effectively reduce the number of parts, reduce the weight of the engine and the complexity of assembly, improve the reliability of the engine, and meet the high reliability and high performance requirements of the aircraft engine.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft engines, and in particular to a compact space shared bearing cavity structure. In addition, the present invention also relates to an aircraft engine comprising the compact space shared bearing cavity structure. Background Art

[0002] In the design of three-spool aircraft engines, when the high-pressure rotor adopts a 1-0-1 support scheme, in order to avoid the use of intermediate bearings, the turbine load-bearing support is moved forward to the back of the high-pressure turbine. The high and low-pressure turbines adopt a co-support design, and the high and low-pressure bearings adopt a co-cavity design. This structure is of great significance to reducing engine weight and improving engine performance.

[0003] The loads of the engine's high- and low-pressure rotors are transmitted to the engine's outer casing or mounting section through the high- and low-pressure bearings, respectively, and then through elastic supports, bearing seats, etc. Among them, the bearing seats are generally rigid in design. To meet the robustness requirements of the engine's high-speed rotor support system, an elastic support structure is usually set between the bearings and the bearing seats to reduce the critical speed of the rotor and reduce rotor vibration. The bearing seats also need to provide lubricating oil channels for the high- and low-pressure bearings, as well as inter-axial seals for the bearing cavities. Therefore, the entire bearing cavity includes complex structural designs such as supply and return oil paths, air cooling and sealing structures, and elastic supports, making the overall structural design difficult and complex.

[0004] At present, in the structural design of the bearing cavity of aircraft engines, springs, oil circuit devices, etc. use additional mounting devices with fastening structures such as bolts, or the oil channels through the springs, bearing seats and nozzles are sealed with expansion rings. Some engine springs, oil injection rings and bearing seats are centered with pin structures, resulting in a large number of parts in the overall layout, a large space occupied in the bearing cavity, and complex assembly, which in turn increases the weight and assembly complexity of the engine, reduces the engine reliability, and does not meet the requirements of high reliability, high performance and long service life of aircraft engines. Summary of the Invention

[0005] The present invention provides a compact space shared bearing cavity structure and an aircraft engine having the same, so as to solve the technical problems existing in the existing aircraft engine structural layout, such as a large number of overall layout parts, large bearing cavity space occupied, and complex assembly, which in turn increases the engine weight and assembly complexity, reduces the engine reliability, and does not meet the requirements of high reliability, high performance and long service life of the aircraft engine.

[0006] The technical solution adopted in the present invention is as follows:

[0007] A compact space shared bearing cavity structure, comprising: a central shaft, a bearing seat sleeved on the central shaft at intervals, a bearing elastic support installed between the central shaft and the bearing seat, an oil injection ring installed between the central shaft and the bearing elastic support, a high-pressure side mounting seal integration and a low-pressure side mounting seal integration installed on the high-pressure side and low-pressure side of the central shaft in sequence, a high-pressure bearing installed on the high-pressure side mounting seal integration with the outer ring pressing against the inner ring of the bearing elastic support, a low-pressure bearing installed on the low-pressure side mounting seal integration with the outer ring pressing against the oil injection ring and the oil injection outer ring located on the outside; the bearing seat, the bearing elastic support and the oil injection outer ring are tightly fitted and connected to form a whole in sequence; the high-pressure side mounting seal integration is also sealed and connected The high-pressure end of the bearing seat is connected to form a high-pressure side sealing end, and the low-pressure side installation sealing integration is also sealed and connected to the low-pressure end of the bearing seat to form a low-pressure side sealing end. The sealing inner ring located on the inner side of the oil injection ring is also sealed and connected to the inner ring of the high-pressure side installation sealing integration and the inner ring of the low-pressure side installation sealing integration, thereby forming a sealed bearing cavity between the bearing seat, the high-pressure side installation sealing integration, the low-pressure side installation sealing integration and the sealing inner ring; a lubricating oil delivery channel is also provided in the compact space shared bearing cavity structure, and the lubricating oil delivery channel is used to introduce external lubricating oil and spray the lubricating oil outward from the nozzle set on the oil injection ring to lubricate the high-pressure bearing and the low-pressure bearing under the ring respectively.

[0008] Furthermore, the bearing spring support is interference fitted in the inner ring of the bearing seat, and the oil injection outer ring is interference fitted in the inner ring of the bearing spring support, and the bearing seat and the bearing spring support, as well as the bearing spring support and the oil injection outer ring are circumferentially limited by multiple sets of concave-convex matching structures arranged at circumferential intervals; the low-pressure side of the oil injection outer ring is also axially limited by an axially extending stop ring that presses against the low-pressure side installation seal integration.

[0009] Furthermore, the outer ring surface of the low-pressure end of the bearing support has a plurality of first outer convex rings which are arranged in sequence along the axial direction and convex outward, the low-pressure end of the bearing support is interference fit with the inner ring surface of the bearing seat through the plurality of first outer convex rings, the high-pressure end of the bearing support is clearance fit with the inner ring surface of the bearing seat, and the outer ring of the high-pressure bearing is tightly pressed against the inner ring of the high-pressure end of the bearing support; the outer ring surface of the oil injection outer ring has a plurality of second outer convex rings which are arranged in sequence along the axial direction and convex outward, the oil injection outer ring is interference fit with the inner ring surface of the low-pressure end of the bearing support through the plurality of second outer convex rings, and the outer ring of the low-pressure bearing is tightly pressed against the inner ring of the oil injection outer ring.

[0010] Furthermore, the lubricating oil delivery channel includes a main oil delivery channel and an oil delivery channel arranged in the bearing seat, a first oil delivery hole and a second oil delivery hole sequentially opened on the inner walls at both ends of the oil delivery channel, a third oil delivery hole opened on the low-pressure end wall of the bearing elastic support, and a fourth oil delivery hole opened on the oil injection outer ring, and the second oil delivery hole and the third oil delivery hole are located between two adjacent first outer convex rings, and the fourth oil delivery hole is located between two adjacent second outer convex rings; the main oil delivery channel is connected to the oil delivery channel to allow external lubricating oil to enter the oil delivery channel; the first oil delivery hole is connected to the oil delivery channel to allow the lubricating oil to enter the high-pressure end of the bearing elastic support and the inner ring of the bearing seat to form a first extrusion oil film; the second oil delivery hole is connected to the oil delivery channel, and the second oil delivery hole, the third oil delivery hole and the fourth oil delivery hole are connected in sequence to allow the lubricating oil to enter the outer ring of the oil injection and the outer ring of the low-pressure bearing to form a second extrusion oil film.

[0011] Furthermore, the oil injection ring also includes an intermediate ring connected between the oil injection outer ring and the sealing inner ring, the high-pressure bearing and the low-pressure bearing are respectively arranged in the bearing cavities on both sides of the axial direction of the intermediate ring, and multiple nozzles are respectively arranged on both sides of the intermediate ring and connected to the connection between the intermediate ring and the sealing inner ring; the lubricating oil delivery channel also includes a first oil delivery channel arranged in the intermediate ring, and an oil injection channel arranged in each nozzle and connected to the first oil delivery channel, and the oil inlet side of the first oil delivery channel is connected to the third oil delivery hole.

[0012] Furthermore, the high-pressure side mounting seal integration includes a high-pressure bearing mounting shaft, and a high-pressure bearing locating ring and a high-pressure bearing locking assembly installed at both ends of the high-pressure bearing mounting shaft. The high-pressure bearing locking assembly is threadedly connected to the high-pressure bearing mounting shaft. The high-pressure bearing is installed on the outer circle of the high-pressure bearing mounting shaft, and the two ends of its inner ring respectively press against the high-pressure bearing locating ring and the high-pressure bearing locking assembly to limit the position; the low-pressure side mounting seal integration includes a low-pressure bearing mounting shaft, and a low-pressure bearing locating ring and a low-pressure bearing locking assembly installed at both ends of the low-pressure bearing mounting shaft. The low-pressure bearing locking assembly is threadedly connected to the low-pressure bearing mounting shaft. The low-pressure bearing is installed on the outer circle of the low-pressure bearing mounting shaft, and the two ends of its inner ring respectively press against the low-pressure bearing locating ring and the low-pressure bearing locking assembly to limit the position.

[0013] Furthermore, a high-pressure side oil collection groove is provided at the corresponding side nozzle of the high-pressure bearing locking assembly, and a second oil supply channel is formed between the high-pressure bearing locking assembly, the high-pressure bearing inner ring and the high-pressure bearing mounting shaft to introduce lubricating oil from the high-pressure side oil collection groove to lubricate the high-pressure bearing under the ring; a low-pressure side oil collection groove is provided at the corresponding side nozzle of the low-pressure bearing locking assembly, and a third oil supply channel is formed between the low-pressure bearing locking assembly, the low-pressure bearing inner ring and the low-pressure bearing mounting shaft to introduce lubricating oil from the low-pressure side oil collection groove to lubricate the low-pressure bearing under the ring.

[0014] Furthermore, the high-pressure side mounting seal integration also includes a high-pressure carbon sealing ring, which is sealed between the high-pressure bearing positioning ring and the bearing seat to form a high-pressure side sealing end, and a fifth oil hole running through the high-pressure bearing positioning ring and the high-pressure bearing mounting shaft is also provided, and a gap is set between the high-pressure bearing mounting shaft and the sealing inner ring to connect the fifth oil hole and the high-pressure side oil collecting groove to form a residual oil delivery channel to reintroduce the residual oil in the high-pressure side oil collecting groove into the bearing cavity on the high-pressure side; the low-pressure side mounting seal integration also includes a low-pressure carbon sealing ring, which is sealed between the low-pressure bearing positioning ring and the bearing seat to form a low-pressure side sealing end, and a sixth oil hole running through the low-pressure bearing positioning ring and the low-pressure bearing mounting shaft is also provided, and a gap is set between the low-pressure bearing mounting shaft and the sealing inner ring to connect the sixth oil hole and the low-pressure side oil collecting groove to form a residual oil delivery channel to reintroduce the residual oil in the low-pressure side oil collecting groove into the bearing cavity on the low-pressure side.

[0015] Furthermore, the high-pressure side mounting seal integration also includes a high-pressure side grate ring that is sealingly connected to the sealing inner ring to form a grate seal, and the high-pressure side grate ring is fixedly connected to the high-pressure bearing mounting shaft; the low-pressure side mounting seal integration also includes a low-pressure side grate ring that is sealingly connected to the sealing inner ring to form a grate seal, and the low-pressure side grate ring is fixedly connected to the low-pressure bearing mounting shaft.

[0016] According to another aspect of the present invention, an aircraft engine is provided, comprising the compact space shared bearing cavity structure as described above.

[0017] The present invention has the following beneficial effects:

[0018] In the compact space shared bearing cavity structure of the present invention, an elastic support structure of a squirrel cage structure is provided between the bearing (including the high-pressure bearing and the low-pressure bearing) and the bearing seat, namely, the bearing elastic support, thereby meeting the requirements of the rotor support stiffness and improving the stability of the rotor. At the same time, the bearing seat, the bearing elastic support and the oil injection outer ring are sequentially stacked and arranged from the outside to the inside and are sequentially tightly fitted and connected into a whole. Therefore, this superimposed assembly is conducive to improving the space utilization between the bearing seat and the central shaft, and the bearing seat, the bearing elastic support and the oil injection outer ring are sequentially tightly fitted and connected into a whole. Compared with the existing bearing seat, elastic support and oil injection ring using mounting edge structure and bolt connection, the structure of the present invention can effectively reduce the number of parts, reduce the engine weight and assembly complexity, thereby improving the engine reliability and meeting the requirements of high reliability, high performance and long service life of the aircraft engine. In the compact space shared bearing cavity structure of the present invention, the high-pressure side installation seal is integrated to seal the high-pressure end of the bearing seat to form a high-pressure side sealing end, a low-pressure side sealing end, and a low-pressure side sealing end. The side-mounted sealing integration seals and connects the low-pressure end of the bearing seat to form a low-pressure side sealing end, and the sealing inner ring located on the inner side of the oil injection ring is respectively sealed and connected to the inner ring of the high-pressure side mounting sealing integration and the inner ring of the low-pressure side mounting sealing integration, thereby forming a sealed bearing cavity between the bearing seat, the high-pressure side mounting sealing integration, the low-pressure side mounting sealing integration and the sealing inner ring, and then high-pressure gas from the periphery can be introduced to seal the bearing cavity, effectively preventing the lubricating oil in the bearing cavity from leaking out, and at the same time forming a structural layout of a high-pressure bearing and a low-pressure bearing sharing a cavity, so that the bearing cavity space is compactly distributed, and the axial and radial dimensions are both small, which better meets the engine size requirements; in the compact space shared bearing cavity structure of the present invention, a lubricating oil delivery channel is also set to introduce external lubricating oil and make the lubricating oil spray outward from the nozzle set on the oil injection ring and then perform under-ring lubrication on the high-pressure bearing and the low-pressure bearing respectively, thereby improving the bearing lubrication effect of the high-pressure bearing and the low-pressure bearing, and increasing the service life of both.

[0019] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of a sectional front view of a compact space shared bearing cavity structure according to a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the middle structure Figure 1 ;

[0023] Figure 3 yes Figure 1 Schematic diagram of the middle part structure Figure 2 ;

[0024] Figure 4 yes Figure 1 Schematic diagram of the middle structure Figure 3 .

[0025] Legend:

[0026] 11. Center shaft; 12. Bearing seat; 13. High-pressure bearing; 14. Low-pressure bearing;

[0027] 2. Bearing spring support; 21. First outer convex ring;

[0028] 3. Injection ring; 31. Injection outer ring; 32. Sealing inner ring; 321. Reinforced boss; 33. Nozzle; 34. Stop ring; 35. Second outer convex ring; 36. Intermediate ring;

[0029] 4. High-pressure side mounting seal assembly; 41. High-pressure bearing mounting shaft; 42. High-pressure bearing locating ring; 43. High-pressure bearing locking assembly; 431. High-pressure side oil collecting groove; 44. High-pressure carbon sealing ring; 45. High-pressure side grate ring;

[0030] 5. Low-pressure side installation seal assembly; 51. Low-pressure bearing installation shaft; 52. Low-pressure bearing locating ring; 53. Low-pressure bearing locking assembly; 531. Low-pressure side oil collecting groove; 54. Low-pressure carbon sealing ring; 55. Low-pressure side grate ring;

[0031] 6. Lubricating oil delivery channel; 61. Main oil delivery channel; 62. Oil delivery channel; 63. First oil delivery hole; 64. Second oil delivery hole; 65. Third oil delivery hole; 66. Fourth oil delivery hole; 67. First oil delivery channel; 68. Oil injection channel; 69. Second oil delivery channel; 71. Third oil delivery channel;

[0032] 8. Excess oil delivery channel; 81. Fifth oil delivery hole; 82. Sixth oil delivery hole;

[0033] 101. First extrusion oil film; 102. Second extrusion oil film; 103. Concave-convex matching structure. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0035] Reference Figure 1A preferred embodiment of the present invention provides a compact, shared bearing cavity structure, comprising: a central shaft 11; a bearing seat 12 spaced and sleeved on the central shaft 11; a bearing spring 2 mounted between the central shaft 11 and the bearing seat 12; an oil spray ring 3 mounted between the central shaft 11 and the bearing spring 2; a high-pressure side mounting seal assembly 4 and a low-pressure side mounting seal assembly 5 mounted on the high-pressure and low-pressure sides of the central shaft 11, respectively; a high-pressure bearing 13 mounted on the high-pressure side mounting seal assembly 4, with its outer ring pressing against the inner ring of the bearing spring 2; and a low-pressure bearing 14 mounted on the low-pressure side mounting seal assembly 5, with its outer ring pressing against an oil spray outer ring 31 located on the outside of the oil spray ring 3. The bearing seat 12, the bearing spring 2, and the oil spray outer ring 31 are tightly fitted and connected in sequence to form an integral whole. The high-pressure side mounting seal assembly 4 is also hermetically connected to the high-pressure end of the bearing seat 12 to form a high-pressure side sealing end. The low-pressure side mounting seal assembly 5 is also hermetically connected to the low-pressure end of the bearing seat 12 to form a low-pressure side sealing end. The inner sealing ring 32 located inside the oil injection ring 3 is also hermetically connected to the inner rings of the high-pressure side mounting seal assembly 4 and the low-pressure side mounting seal assembly 5, respectively. This forms a sealed bearing cavity between the bearing seat 12, the high-pressure side mounting seal assembly 4, the low-pressure side mounting seal assembly 5, and the inner sealing ring 32. An oil delivery channel 6 is also provided within the compact, shared bearing cavity structure. This channel is used to introduce external lubricating oil and spray it outward from the nozzles 33 provided on the oil injection ring 3 to lubricate the high-pressure bearing 13 and the low-pressure bearing 14, respectively.

[0036] In the compact space shared bearing cavity structure of the present invention, an elastic support structure of a squirrel cage structure, namely, a bearing elastic support 2, is provided between the bearing (including the high-pressure bearing 13 and the low-pressure bearing 14) and the bearing seat 12, thereby meeting the requirements of the rotor support stiffness and improving the stability of the rotor. At the same time, the bearing seat 12, the bearing elastic support 2 and the oil injection outer ring 31 are sequentially stacked and arranged from the outside to the inside and are sequentially tightly fitted and connected into a whole. Therefore, this superimposed assembly is conducive to improving the space utilization between the bearing seat 12 and the central shaft 11, and the bearing seat 12, the bearing elastic support 2 and the oil injection outer ring 31 are sequentially tightly fitted and connected into a whole. Compared with the existing bearing seat, elastic support and oil injection ring using mounting edge structure and bolt connection, the structure of the present invention can effectively reduce the number of parts, reduce the engine weight and assembly complexity, thereby improving the engine reliability and meeting the requirements of high reliability, high performance and long service life of the aircraft engine. In the compact space shared bearing cavity structure of the present invention, the high-pressure side mounting seal integrated 4 is sealed to connect the high-pressure end of the bearing seat 12 to form a high-pressure side sealing end and a low-pressure side mounting seal. The sealing integration 5 is sealed and connected to the low-pressure end of the bearing seat 12 to form a low-pressure side sealing end, and the sealing inner ring 32 located on the inner side of the oil injection ring 3 is respectively sealed and connected to the inner ring of the high-pressure side installation sealing integration 4 and the inner ring of the low-pressure side installation sealing integration 5, thereby forming a sealed bearing cavity between the bearing seat 12, the high-pressure side installation sealing integration 4, the low-pressure side installation sealing integration 5 and the sealing inner ring 32, and then the peripheral high-pressure gas can be introduced to seal the bearing cavity, effectively preventing the lubricating oil in the bearing cavity from leaking out, and at the same time forming a structural layout of the high-pressure bearing 13 and the low-pressure bearing 14 sharing the cavity, so that the bearing cavity space distribution is compact, the axial size and radial size are both small, and the engine size requirements are better met; in the compact space shared bearing cavity structure of the present invention, the lubricating oil delivery channel 6 is also provided to introduce external lubricating oil and make the lubricating oil spray outward from the nozzle 33 provided on the oil injection ring 3 and then perform under-ring lubrication on the high-pressure bearing 13 and the low-pressure bearing 14 respectively, thereby improving the bearing lubrication effect of the high-pressure bearing 13 and the low-pressure bearing 14, and improving the service life of both.

[0037] Alternatively, as Figure 1 and Figure 2As shown, the bearing spring 2 is interference-fitted within the inner ring of the bearing seat 12, while the oil injection outer ring 31 is interference-fitted within the inner ring of the bearing spring 2. Multiple sets of circumferentially spaced concave-convex fittings are used to provide circumferential restraint between the bearing seat 12 and the bearing spring 2, and between the bearing spring 2 and the oil injection outer ring 31. The low-pressure side of the oil injection outer ring 31 is also restrained axially by an axially extending stop ring 34 that presses against the low-pressure side mounting seal assembly 5. In this optional solution, the bearing seat 12, the bearing spring support 2 and the oil injection outer ring 31 are firstly fitted in pairs by interference fit, thereby achieving preliminary fastening of the three. Then, the bearing seat 12 and the bearing spring support 2, and the bearing spring support 2 and the oil injection outer ring 31 are respectively provided with multiple sets of concave-convex matching structures 103 arranged at circumferential intervals to achieve circumferential limitation and further strengthen the fixed connection between the three. Finally, the low-pressure side of the oil injection outer ring 31 is also pressed against the low-pressure side by the axially extending stop ring 34 to install the sealing integration 5, so as to achieve axial limitation of the entire structure (such as Figure 1 As shown, the axial limiting principle is: the bearing seat 12 is fixed, the low-pressure side of the bearing elastic support 2 and the bearing seat 12 are limited along the axial left end through multiple sets of concave-convex matching structures 103, and the oil injection outer ring 31 is limited in the axial direction by the multiple sets of concave-convex matching structures 103 of the bearing elastic support 2 and the low-pressure side installation seal integration 5, thereby realizing the axial limiting of the bearing seat 12, the bearing elastic support 2 and the oil injection outer ring 31 as a whole).

[0038] In this option, if Figure 2 As shown, the outer ring surface of the low-pressure end of the bearing support 2 has multiple first outer protruding rings 21 spaced sequentially along the axial direction and convex. The low-pressure end of the bearing support 2 has an interference fit with the inner ring surface of the bearing seat 12 through these multiple first outer protruding rings 21. The high-pressure end of the bearing support 2 has a clearance fit with the inner ring surface of the bearing seat 12, and the outer ring of the high-pressure bearing 13 is tightly pressed against the inner ring of the high-pressure end of the bearing support 2. The outer ring surface of the oil injection outer ring 31 has multiple second outer protruding rings 35 spaced sequentially along the axial direction and convex. The oil injection outer ring 31 has an interference fit with the inner ring surface of the low-pressure end of the bearing support 2 through these multiple second outer protruding rings 35, and the outer ring of the low-pressure bearing 14 is tightly pressed against the inner ring of the oil injection outer ring 31.

[0039] Alternatively, as Figure 2As shown, the lubricating oil delivery channel 6 includes a main oil delivery channel 61 and an oil delivery channel 62 arranged within the bearing seat 12; a first oil delivery hole 63 and a second oil delivery hole 64, respectively, formed on the inner walls of the oil delivery channel 62 at both ends; a third oil delivery hole 65 formed on the low-pressure end wall of the bearing spring 2; and a fourth oil delivery hole 66 formed on the oil injection outer ring 31. The second oil delivery hole 64 and the third oil delivery hole 65 are located between two adjacent first outer protruding rings 21, and the fourth oil delivery hole 66 is located between two adjacent second outer protruding rings 35. The main oil delivery channel 61 communicates with the oil delivery channel 62 to allow external lubricating oil to enter the oil delivery channel 62. The first oil delivery hole 63 connects to the oil delivery channel 62, allowing lubricating oil to enter the space between the high-pressure end of the bearing spring 2 and the inner ring of the bearing seat 12, forming a first squeeze oil film 101. In this optional solution, because the low-pressure side of the bearing spring 2 is tightly fitted with the bearing seat 12 and the oil injection outer ring 31 to form an integral whole, the high-pressure end of the bearing spring 2 and the inner ring surface of the bearing seat 12 are loosely matched to form a first squeeze oil film 101 between them. This serves to reduce vibration on the high-pressure side of the bearing spring 2, thereby indirectly suppressing vibration of the high-pressure bearing 13, extending its service life, and improving its operational stability. The second oil delivery hole 64 connects to the oil delivery channel 62. The second oil delivery hole 64, the third oil delivery hole 65, and the fourth oil delivery hole 66 are sequentially connected, allowing lubricating oil to enter the space between the oil injection outer ring 31 and the outer ring of the low-pressure bearing 14, forming a second squeeze oil film 102. This serves to suppress vibration of the low-pressure bearing 14, extending its service life, and improving its operational stability.

[0040] Alternatively, as Figure 2 As shown, the oil injection ring 3 also includes an intermediate ring 36 connected between the oil injection outer ring 31 and the sealing inner ring 32. The high-pressure bearing 13 and the low-pressure bearing 14 are respectively disposed in two bearing cavities on either axial side of the intermediate ring 36. Multiple nozzles 33 are disposed on either side of the intermediate ring 36 and connected to the junction between the intermediate ring 36 and the sealing inner ring 32. The lubricating oil delivery channel 6 also includes a first oil delivery channel 67 disposed within the intermediate ring 36, and an oil injection channel 68 disposed within each nozzle 33 and connected to the first oil delivery channel 67. The oil inlet side of the first oil delivery channel 67 is connected to the third oil delivery hole 65.

[0041] Alternatively, as Figure 2 and Figure 3As shown, the high-pressure side mounting seal assembly 4 includes a high-pressure bearing mounting shaft 41, and a high-pressure bearing positioning ring 42 and a high-pressure bearing locking assembly 43 installed at both ends of the high-pressure bearing mounting shaft 41. The high-pressure bearing locking assembly 43 is threadedly connected to the high-pressure bearing mounting shaft 41. The high-pressure bearing 13 is installed on the outer circle of the high-pressure bearing mounting shaft 41, and the two ends of its inner ring respectively press against the high-pressure bearing positioning ring 42 and the high-pressure bearing locking assembly 43 for limiting position. In this optional solution, the high-pressure bearing locking assembly 43 includes a high-pressure locking ring and a high-pressure locking nut arranged in sequence, and the high-pressure locking nut is threadedly connected to the outer circle of the high-pressure bearing mounting shaft 41, and is used to apply force to tighten the high-pressure locking ring against the inner ring of the high-pressure bearing 13.

[0042] Alternatively, as Figure 2 and Figure 3 As shown, the low-pressure side mounting seal assembly 5 includes a low-pressure bearing mounting shaft 51, and a low-pressure bearing locating ring 52 and a low-pressure bearing locking assembly 53 installed at both ends of the low-pressure bearing mounting shaft 51. The low-pressure bearing locking assembly 53 is threadedly connected to the low-pressure bearing mounting shaft 51. The low-pressure bearing 14 is installed on the outer circle of the low-pressure bearing mounting shaft 51, and the two ends of its inner ring respectively press against the low-pressure bearing locating ring 52 and the low-pressure bearing locking assembly 53 to limit the position. In this optional solution, the low-pressure bearing locking assembly 53 includes a low-pressure locking ring and a low-pressure locking nut arranged in sequence, and the low-pressure locking nut is threadedly connected to the outer circle of the low-pressure bearing mounting shaft 51, which is used to apply force to tighten the low-pressure locking ring against the inner ring of the low-pressure bearing 14.

[0043] Furthermore, if Figure 2 and Figure 3 As shown, the high-pressure bearing locking assembly 43 is provided with a high-pressure oil collection groove 431 facing the corresponding side nozzle 33, and a second oil delivery channel 69 is formed between the high-pressure bearing locking assembly 43 and the inner ring of the high-pressure bearing 13 and the high-pressure bearing mounting shaft 41 to introduce lubricating oil from the high-pressure oil collection groove 431 to lubricate the high-pressure bearing 13 below the ring. The low-pressure bearing locking assembly 53 is provided with a low-pressure oil collection groove 531 facing the corresponding side nozzle 33, and a third oil delivery channel 71 is formed between the low-pressure bearing locking assembly 53 and the inner ring of the low-pressure bearing 14 and the low-pressure bearing mounting shaft 51 to introduce lubricating oil from the low-pressure oil collection groove 531 to lubricate the low-pressure bearing 14 below the ring.

[0044] During operation, the lubricating oil received from the bearing seat 12 is divided into two paths. One path of lubricating oil enters between the bearing seat 12 and the high-pressure end of the bearing spring 2 to form a non-centered first squeeze oil film 101; the other path partially enters between the oil injection outer ring 31 and the outer ring of the low-pressure bearing 14 along the oil delivery holes (including the second oil delivery hole 64, the third oil delivery hole 65 and the fourth oil delivery hole 66) opened on the bearing spring 2 and the oil injection outer ring 31, forming a non-centered second squeeze oil film 102. The non-centered squeeze oil film can provide damping, which is beneficial to suppressing the vibration of the high- and low-pressure rotors; the remaining lubricating oil enters the multiple nozzles 33 of the oil injection ring 3 and is directly injected into the high-pressure side oil collection groove 431 and the low-pressure side oil collection groove 531 respectively. Then, the lubricating oil reaches the lower part of the inner ring of the high-pressure bearing 13 and the low-pressure bearing 14 respectively through the second oil delivery channel 69 and the third oil delivery channel 71 for under-ring lubrication. The under-ring lubrication method has high oil collection efficiency and can effectively complete the bearing cooling during engine operation.

[0045] Alternatively, as Figure 1 and Figure 3 As shown, the high-pressure side mounting seal integration 4 also includes a high-pressure carbon sealing ring 44, which is sealed between the high-pressure bearing positioning ring 42 and the bearing seat 12 to form a high-pressure side sealing end. The high-pressure bearing positioning ring 42 and the high-pressure bearing mounting shaft 41 are also provided with a fifth oil hole 81 that runs through the two. A gap is set between the high-pressure bearing mounting shaft 41 and the sealing inner ring 32 to connect the fifth oil hole 81 and the high-pressure side oil collecting groove 431 to form a residual oil delivery channel 8 to reintroduce the residual oil in the high-pressure side oil collecting groove 431 into the bearing cavity on the high-pressure side. The low-pressure side mounting seal integration 5 also includes a low-pressure carbon sealing ring 54, which is sealed between the low-pressure bearing positioning ring 52 and the bearing seat 12 to form a low-pressure side sealing end. The low-pressure bearing positioning ring 52 and the low-pressure bearing mounting shaft 51 are also provided with a sixth oil delivery hole 82 that passes through the two. A gap is set between the low-pressure bearing mounting shaft 51 and the sealing inner ring 32 to connect the sixth oil delivery hole 82 and the low-pressure side oil collecting groove 531 to form a residual oil delivery channel 8 to reintroduce the residual oil in the low-pressure side oil collecting groove 531 into the bearing cavity on the low-pressure side.

[0046] Alternatively, as Figure 4 As shown, the high-pressure side mounting seal integration 4 also includes a high-pressure side grate ring 45 that is sealed and connected to the sealing inner ring 32 to form a grate seal, and the high-pressure side grate ring 45 is fixedly connected to the high-pressure bearing mounting shaft 41. The low-pressure side mounting seal integration 5 also includes a low-pressure side grate ring 55 that is sealed and connected to the sealing inner ring 32 to form a grate seal, and the low-pressure side grate ring 55 is fixedly connected to the low-pressure bearing mounting shaft 51. In this optional solution, the same oil injection ring 3 is used to achieve cooling and lubrication of bearings on different rotors in the common bearing cavity, and the oil injection ring 3 has an integrated design with a sealing structure, and the structure is simple. Preferably, as Figure 4As shown, a plurality of reinforcing bosses 321 arranged in sequence along the axial direction and protruding outward are further provided on the outer circle of the sealing inner ring 32. The reinforcing bosses 321 are used to reduce the vibration caused by the scraping of the comb teeth.

[0047] During design, high-pressure carbon sealing ring 44 and low-pressure carbon sealing ring 54 seal against bearing seat 12 and high-pressure bearing locating ring 42 and low-pressure bearing locating ring 52, respectively, sealing the upper end of the bearing cavity by introducing high-pressure gas. Simultaneously, sealing inner ring 32 cooperates with high-pressure side grate ring 45 and low-pressure side grate ring 55, respectively, to form a labyrinthine sealing structure that allows the introduction of high-pressure gas to seal the lower end of the bearing, preventing oil leakage. During operation, any excess oil that does not enter oil delivery channel 6 is centrifugally forced into the bearing cavity via the two excess oil delivery channels 8, further reducing the risk of oil leakage.

[0048] Optionally, a preferred embodiment of the present invention further provides an aircraft engine comprising a compact space shared bearing cavity structure as described above. The aircraft engine of the present invention can effectively meet the requirements for rotor support stiffness and improve rotor robustness. Furthermore, the aircraft engine of the present invention can effectively reduce the number of parts, reduce engine weight and assembly complexity, thereby improving engine reliability and meeting the requirements for high reliability, high performance, and long service life of aircraft engines. The engine of the present invention can also effectively prevent the leakage of lubricating oil in the bearing cavity, and has a compact bearing cavity space distribution with small axial and radial dimensions, which better meets engine size requirements.

[0049] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A compact space shared bearing cavity structure, characterized in that: include: A central shaft (11), a bearing seat (12) spaced apart and sleeved on the central shaft (11), a bearing elastic support (2) mounted between the central shaft (11) and the bearing seat (12), an oil injection ring (3) mounted between the central shaft (11) and the bearing elastic support (2), a high-pressure side mounting seal assembly (4) and a low-pressure side mounting seal assembly (5) mounted on the high-pressure side and low-pressure sides of the central shaft (11) in sequence, a high-pressure bearing (13) mounted on the high-pressure side mounting seal assembly (4) with its outer ring pressing against the inner ring of the bearing elastic support (2), and a low-pressure bearing (14) mounted on the low-pressure side mounting seal assembly (5) with its outer ring pressing against the oil injection ring (3) and its outer ring being located on the outer side of the oil injection outer ring (31); The bearing seat (12), the bearing spring support (2) and the oil injection outer ring (31) are tightly fitted in sequence and connected to form a whole; The high-pressure side mounting seal integration (4) is also sealed and connected to the high-pressure end of the bearing seat (12) to form a high-pressure side sealing end, and the low-pressure side mounting seal integration (5) is also sealed and connected to the low-pressure end of the bearing seat (12) to form a low-pressure side sealing end. The sealing inner ring (32) located on the inner side of the injection ring (3) is also sealed and connected to the inner ring of the high-pressure side mounting seal integration (4) and the inner ring of the low-pressure side mounting seal integration (5), thereby forming a sealed bearing cavity between the bearing seat (12), the high-pressure side mounting seal integration (4), the low-pressure side mounting seal integration (5) and the sealing inner ring (32); A lubricating oil delivery channel (6) is further provided in the compact space common bearing cavity structure. The lubricating oil delivery channel (6) is used to introduce external lubricating oil and allow the lubricating oil to be sprayed outward from a nozzle (33) provided on the oil spray ring (3) to perform under-ring lubrication on the high-pressure bearing (13) and the low-pressure bearing (14).

2. The compact space shared bearing cavity structure according to claim 1 is characterized in that: The bearing spring support (2) is interference-mounted in the inner ring of the bearing seat (12), and the oil injection outer ring (31) is interference-mounted in the inner ring of the bearing spring support (2). The bearing seat (12) and the bearing spring support (2), and the bearing spring support (2) and the oil injection outer ring (31) are also circumferentially limited by multiple groups of concave-convex matching structures arranged at circumferential intervals. The low-pressure side of the oil injection outer ring (31) is also axially limited by an axially extending stop ring (34) against the low-pressure side installation seal integration (5).

3. The compact space shared bearing cavity structure according to claim 2, characterized in that: The outer ring surface of the low-pressure end of the bearing elastic support (2) has a plurality of first outer convex rings (21) which are arranged in sequence along the axial direction and convex outwardly. The low-pressure end of the bearing elastic support (2) is interference-fitted with the inner ring surface of the bearing seat (12) through the plurality of first outer convex rings (21). The high-pressure end of the bearing elastic support (2) is clearance-fitted with the inner ring surface of the bearing seat (12), and the outer ring of the high-pressure bearing (13) is tightly pressed against the inner ring of the high-pressure end of the bearing elastic support (2). The outer ring surface of the oil injection outer ring (31) has a plurality of second outer convex rings (35) which are arranged in sequence along the axial direction and convex outwardly. The oil injection outer ring (31) is interference-fitted with the inner ring surface of the low-pressure end of the bearing elastic support (2) through the plurality of second outer convex rings (35), and the outer ring of the low-pressure bearing (14) is tightly pressed against the inner ring of the oil injection outer ring (31).

4. The compact space shared bearing cavity structure according to claim 3 is characterized in that: The lubricating oil delivery channel (6) includes a main oil delivery channel (61) and an oil delivery channel (62) arranged in the bearing seat (12), a first oil delivery hole (63) and a second oil delivery hole (64) sequentially opened on the inner wall of both ends of the oil delivery channel (62), a third oil delivery hole (65) opened on the low-pressure end wall of the bearing elastic support (2), and a fourth oil delivery hole (66) opened on the oil injection outer ring (31), wherein the second oil delivery hole (64) and the third oil delivery hole (65) are located between two adjacent first outer convex rings (21), and the fourth oil delivery hole (66) is located between two adjacent second outer convex rings (35). The main oil delivery channel (61) is connected to the oil delivery channel (62) to allow external lubricating oil to enter the oil delivery channel (62); the first oil delivery hole (63) is connected to the oil delivery channel (62) to allow lubricating oil to enter the high-pressure end of the bearing elastic support (2) and the inner ring of the bearing seat (12) to form a first squeeze oil film (101); the second oil delivery hole (64) is connected to the oil delivery channel (62), and the second oil delivery hole (64), the third oil delivery hole (65) and the fourth oil delivery hole (66) are connected in sequence to allow lubricating oil to enter the injection outer ring (31) and the outer ring of the low-pressure bearing (14) to form a second squeeze oil film (102).

5. The compact space shared bearing cavity structure according to claim 4, characterized in that: The oil injection ring (3) further includes an intermediate ring (36) connected between the oil injection outer ring (31) and the sealing inner ring (32); the high-pressure bearing (13) and the low-pressure bearing (14) are respectively arranged in the bearing cavities on both sides of the axial direction of the intermediate ring (36); a plurality of nozzles (33) are respectively arranged on both sides of the intermediate ring (36) and connected to the connection between the intermediate ring (36) and the sealing inner ring (32); the lubricating oil delivery channel (6) further includes a first oil delivery channel (67) arranged in the intermediate ring (36), and an oil injection channel (68) arranged in each nozzle (33) and connected to the first oil delivery channel (67); the oil inlet side of the first oil delivery channel (67) is connected to the third oil delivery hole (65).

6. The compact space shared bearing cavity structure according to claim 1, characterized in that: The high-pressure side mounting seal assembly (4) includes a high-pressure bearing mounting shaft (41), and a high-pressure bearing positioning ring (42) and a high-pressure bearing locking assembly (43) mounted on both ends of the high-pressure bearing mounting shaft (41). The high-pressure bearing locking assembly (43) is threadedly connected to the high-pressure bearing mounting shaft (41). The high-pressure bearing (13) is mounted on the outer circle of the high-pressure bearing mounting shaft (41), and the two ends of its inner ring respectively abut against the high-pressure bearing positioning ring (42) and the high-pressure bearing locking assembly (43) for limiting position. The low-pressure side mounting seal assembly (5) includes a low-pressure bearing mounting shaft (51), and a low-pressure bearing locating ring (52) and a low-pressure bearing locking assembly (53) mounted on both ends of the low-pressure bearing mounting shaft (51). The low-pressure bearing locking assembly (53) is threadedly connected to the low-pressure bearing mounting shaft (51). The low-pressure bearing (14) is mounted on the outer circle of the low-pressure bearing mounting shaft (51), and the two ends of its inner ring respectively press against the low-pressure bearing locating ring (52) and the low-pressure bearing locking assembly (53) to limit the position.

7. The compact space shared bearing cavity structure according to claim 6, characterized in that: The high-pressure bearing locking assembly (43) is provided with a high-pressure side oil collecting groove (431) toward the corresponding side nozzle (33), and a second oil delivery channel (69) is formed between the high-pressure bearing locking assembly (43) and the inner ring of the high-pressure bearing (13) and the high-pressure bearing mounting shaft (41) to introduce the lubricating oil in the high-pressure side oil collecting groove (431) to lubricate the high-pressure bearing (13) under the ring; the low-pressure bearing locking assembly (53) is provided with a low-pressure side oil collecting groove (531) toward the corresponding side nozzle (33), and a third oil delivery channel (71) is formed between the low-pressure bearing locking assembly (53) and the inner ring of the low-pressure bearing (14) and the low-pressure bearing mounting shaft (51) to introduce the lubricating oil in the low-pressure side oil collecting groove (531) to lubricate the low-pressure bearing (14) under the ring.

8. The compact space shared bearing cavity structure according to claim 7, characterized in that: The high-pressure side mounting seal assembly (4) further includes a high-pressure carbon sealing ring (44), which is sealingly arranged between the high-pressure bearing positioning ring (42) and the bearing seat (12) to form a high-pressure side sealing end. A fifth oil delivery hole (81) is also provided on the high-pressure bearing positioning ring (42) and the high-pressure bearing mounting shaft (41) to pass through the two. A gap is set between the high-pressure bearing mounting shaft (41) and the sealing inner ring (32) to connect the fifth oil delivery hole (81) and the high-pressure side oil collecting groove (431) to form a residual oil delivery channel (8) to reintroduce the residual oil in the high-pressure side oil collecting groove (431) into the bearing cavity; The low-pressure side mounting seal assembly (5) further includes a low-pressure carbon sealing ring (54), which is sealingly arranged between the low-pressure bearing positioning ring (52) and the bearing seat (12) to form a low-pressure side sealing end. A sixth oil delivery hole (82) running through the low-pressure bearing positioning ring (52) and the low-pressure bearing mounting shaft (51) is also provided. A gap is set between the low-pressure bearing mounting shaft (51) and the sealing inner ring (32) to connect the sixth oil delivery hole (82) and the low-pressure side oil collecting groove (531) to form a residual oil delivery channel (8) to reintroduce the residual oil in the low-pressure side oil collecting groove (531) into the bearing cavity.

9. The compact space shared bearing cavity structure according to claim 6, characterized in that: The high-pressure side mounting seal assembly (4) further includes a high-pressure side grate ring (45) that is sealingly connected to the sealing inner ring (32) to form a grate seal, and the high-pressure side grate ring (45) is fixedly connected to the high-pressure bearing mounting shaft (41); the low-pressure side mounting seal assembly (5) further includes a low-pressure side grate ring (55) that is sealingly connected to the sealing inner ring (32) to form a grate seal, and the low-pressure side grate ring (55) is fixedly connected to the low-pressure bearing mounting shaft (51).

10. An aircraft engine, characterized in that: The invention comprises a compact space shared bearing cavity structure as claimed in any one of claims 1 to 9.

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