Compact space shared bearing cavity structure and aero-engine with same

Abstract

The invention discloses a compact space shared bearing cavity structure and an aero-engine with the same. The compact space shared bearing cavity structure comprises a center shaft, a bearing seat, a bearing elastic support, an oil injection ring, a high-pressure side installation sealing assembly, a low-pressure side installation sealing assembly, a high-pressure bearing and a low-pressure bearing. The high-pressure side installation sealing assembly is further connected with the high-pressure end of the bearing seat in a sealed mode to form a high-pressure side sealing end, and the low-pressure side installation sealing assembly is further connected with the low-pressure end of the bearing seat in a sealed mode to form a low-pressure side sealing end. The sealing inner ring, located on the inner side, of the oil injection ring is further connected with the inner ring of the high-pressure side installation sealing integration and the inner ring of the low-pressure side installation sealing integration in a sealed mode. A lubricating oil conveying channel is further arranged in the bearing cavity structure shared by the compact space and used for guiding in external lubricating oil to conduct under-ring lubrication on the high-pressure bearing and the low-pressure bearing. According to the structure, the number of parts can be effectively reduced, the engine weight and assembly complexity are reduced, the engine reliability is improved, and the requirements for high reliability and high performance of an aero-engine are met.

Description

Technical Field

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

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

[0003] The loads of the high-pressure and low-pressure rotors of the engine are respectively transmitted through the high-pressure and low-pressure bearings, and then through elastic supports, bearing housings, etc. to the outer casing or mounting lugs of the engine. Among them, the bearing housing is generally of a rigid design. To meet the robustness requirements of the high-speed rotor support system of the engine, an elastic support structure is usually provided between the bearing and the bearing housing to reduce the critical speed of the rotor and reduce the vibration of the rotor. The bearing housing also needs to provide a lubricating oil flow path channel for the high-pressure and low-pressure bearings and the shaft seal of the bearing cavity, etc. Therefore, the entire bearing cavity includes complex oil supply and return flow path, air cooling and sealing structures, elastic supports and other structural designs, making the overall structural design difficult and the structure complex.

[0004] At present, in the structural design of the bearing co-cavity of aero-engines, additional installation devices such as bolt fastening structures are used for elastic supports, oil circuit devices, etc., or packing rings are used for sealing the oil flow channels inside the elastic supports, bearing housings and nozzles. In some engines, pins are used to center the elastic supports, fuel injection rings and bearing housings, resulting in a large number of parts in the overall layout, large space occupied in the bearing cavity, complex assembly, and thus increasing the weight and assembly complexity of the engine, reducing the reliability of the engine, and not meeting the requirements of high reliability, high performance and high service life of aero-engines. Summary of the Invention

[0005] The present invention provides a compact-space shared bearing cavity structure and an aero-engine having the same, so as to solve the technical problems existing in the structural layout of existing aero-engines, such as a large number of parts in the overall layout, large space occupied in the bearing cavity, complex assembly, thus increasing the weight and assembly complexity of the engine, reducing the reliability of the engine, and at the same time not meeting the requirements of high reliability, high performance and high service life of aero-engines.

[0006] The technical solution adopted by the present invention is as follows: A compact space-sharing 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 installation seal integration and a low-pressure side installation seal integration installed on the high-pressure side and the low-pressure side of the central shaft in sequence, a high-pressure bearing installed on the high-pressure side installation seal integration and with its outer ring tightly pressing against the inner ring of the bearing elastic support, and a low-pressure bearing installed on the low-pressure side installation seal integration and with its outer ring tightly pressing against the outer oil injection ring of the oil injection ring located on the outside; the bearing seat, the bearing elastic support and the outer oil injection ring are tightly fitted and connected in sequence to form an integral body; the high-pressure side installation seal integration also seals and connects the high-pressure end of the bearing seat to form a high-pressure side seal end, the low-pressure side installation seal integration also seals and connects the low-pressure end of the bearing seat to form a low-pressure side seal end, and the sealing inner ring located on the inner side of the oil injection ring also seals and connects the inner ring of the high-pressure side installation seal integration and the inner ring of the low-pressure side installation seal integration respectively, so as to form a sealed bearing cavity among the bearing seat, the high-pressure side installation seal integration, the low-pressure side installation seal integration and the sealing inner ring; a lubricating oil conveying channel is also arranged in the compact space-sharing bearing cavity structure, and the lubricating oil conveying channel is used for introducing external lubricating oil and spraying the lubricating oil outwards through nozzles arranged on the oil injection ring, and then lubricating the high-pressure bearing and the low-pressure bearing under the ring respectively.

[0007] Further, the bearing elastic support is press-fitted into the inner ring of the bearing seat, the outer oil injection ring is press-fitted into the inner ring of the bearing elastic support, and circumferential limiting is respectively carried out between the bearing seat and the bearing elastic support and between the bearing elastic support and the outer oil injection ring through multiple groups of concave-convex matching structures arranged at circumferential intervals; the low-pressure side of the outer oil injection ring also abuts against the low-pressure side installation seal integration through an axially extending stop ring for axial limiting.

[0008] Further, the outer ring surface of the low-pressure end of the bearing elastic support has a plurality of first outer convex rings which are arranged at intervals along the axial direction and protrude outwards, the low-pressure end of the bearing elastic support is press-fitted with the inner ring surface of the bearing seat through the plurality of first outer convex rings, the high-pressure end of the bearing elastic support is in clearance fit with the inner ring surface of the bearing seat, and the outer ring of the high-pressure bearing abuts tightly against the inner ring of the high-pressure end of the bearing elastic support; the outer ring surface of the outer oil injection ring has a plurality of second outer convex rings which are arranged at intervals along the axial direction and protrude outwards, the outer oil injection ring is press-fitted with the inner ring surface of the low-pressure end of the bearing elastic support through the plurality of second outer convex rings, and the outer ring of the low-pressure bearing abuts tightly against the inner ring of the outer oil injection ring.

[0009] Further, the lubricating oil delivery passage includes a main oil delivery passage and an oil delivery passage disposed in the bearing housing, a first oil delivery hole and a second oil delivery hole sequentially opened on the inner walls at both ends of the oil delivery passage, a third oil delivery hole opened on the low-pressure end wall of the bearing spring support, and a fourth oil delivery hole opened on the outer oil injection ring. 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 passage communicates with the oil delivery passage to introduce external lubricating oil into the oil delivery passage. The first oil delivery hole communicates with the oil delivery passage to enable the lubricating oil to enter the high-pressure end of the bearing spring support and form a first squeezing oil film between the inner ring of the bearing housing. The second oil delivery hole communicates with the oil delivery passage, and the second oil delivery hole, the third oil delivery hole, and the fourth oil delivery hole are sequentially communicated to enable the lubricating oil to enter the outer oil injection ring and form a second squeezing oil film between the outer ring of the low-pressure bearing.

[0010] Further, the oil injection ring further includes an intermediate ring connected between the outer oil injection ring and the sealing inner ring. The high-pressure bearing and the low-pressure bearing are respectively disposed in the bearing cavities on both axial sides of the intermediate ring. A plurality of nozzles are respectively disposed 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 passage further includes a first oil delivery passage disposed in the intermediate ring and an oil injection passage disposed in each nozzle and communicating with the first oil delivery passage. The oil inlet side of the first oil delivery passage communicates with the third oil delivery hole.

[0011] Further, the high-pressure side installation seal assembly includes a high-pressure bearing installation shaft, and a high-pressure bearing positioning ring and a high-pressure bearing locking assembly installed at both ends of the high-pressure bearing installation shaft. The high-pressure bearing locking assembly is threadedly connected to the high-pressure bearing installation shaft. The high-pressure bearing is installed on the outer circle of the high-pressure bearing installation shaft, and both ends of its inner ring respectively abut against the high-pressure bearing positioning ring and the high-pressure bearing locking assembly for positioning. The low-pressure side installation seal assembly includes a low-pressure bearing installation shaft, and a low-pressure bearing positioning ring and a low-pressure bearing locking assembly installed at both ends of the low-pressure bearing installation shaft. The low-pressure bearing locking assembly is threadedly connected to the low-pressure bearing installation shaft. The low-pressure bearing is installed on the outer circle of the low-pressure bearing installation shaft, and both ends of its inner ring respectively abut against the low-pressure bearing positioning ring and the low-pressure bearing locking assembly for positioning.

[0012] Further, a high-pressure side oil collecting groove is provided at the high-pressure bearing locking assembly facing the corresponding side nozzle, and a second oil delivery passage is formed between both the high-pressure bearing locking assembly and the inner ring of the high-pressure bearing and the high-pressure bearing installation shaft to introduce the lubricating oil in the high-pressure side oil collecting groove to lubricate the high-pressure bearing under the ring. A low-pressure side oil collecting groove is provided at the low-pressure bearing locking assembly facing the corresponding side nozzle, and a third oil delivery passage is formed between both the low-pressure bearing locking assembly and the inner ring of the low-pressure bearing and the low-pressure bearing installation shaft to introduce the lubricating oil in the low-pressure side oil collecting groove to lubricate the low-pressure bearing under the ring.

[0013] Further, the high-pressure side mounting seal assembly further includes a high-pressure carbon seal ring, which is sealingly arranged between the high-pressure bearing positioning ring and the bearing housing to form a high-pressure side sealing end. The high-pressure bearing positioning ring and the high-pressure bearing mounting shaft are also provided with a fifth oil delivery hole penetrating through both of them. The high-pressure bearing mounting shaft is arranged with a clearance from the seal inner ring to communicate the fifth oil delivery hole and the high-pressure side oil sump to form an oil residue delivery channel, so as to re-introduce the oil residue in the high-pressure side oil sump into the bearing cavity on the high-pressure side; the low-pressure side mounting seal assembly further includes a low-pressure carbon seal ring, which is sealingly arranged between the low-pressure bearing positioning ring and the bearing housing to form a low-pressure side sealing end. The low-pressure bearing positioning ring and the low-pressure bearing mounting shaft are also provided with a sixth oil delivery hole penetrating through both of them. The low-pressure bearing mounting shaft is arranged with a clearance from the seal inner ring to communicate the sixth oil delivery hole and the low-pressure side oil sump to form an oil residue delivery channel, so as to re-introduce the oil residue in the low-pressure side oil sump into the bearing cavity on the low-pressure side.

[0014] Further, the high-pressure side mounting seal assembly further includes a high-pressure side labyrinth ring that is sealingly connected to the seal inner ring to form a labyrinth seal. The high-pressure side labyrinth ring is fixedly connected to the high-pressure bearing mounting shaft; the low-pressure side mounting seal assembly further includes a low-pressure side labyrinth ring that is sealingly connected to the seal inner ring to form a labyrinth seal. The low-pressure side labyrinth ring is fixedly connected to the low-pressure bearing mounting shaft.

[0015] According to another aspect of the present invention, there is also provided an aeroengine, including the compact space shared bearing cavity structure as described in any one of the above.

[0016] The present invention has the following beneficial effects: In the compact space shared bearing cavity structure of the present invention, an elastic support structure in the form of a squirrel cage is provided between the bearings (including high-pressure bearings and low-pressure bearings) and the bearing housing, that is, a bearing elastic support, so as to meet the requirements of rotor support stiffness, improve rotor robustness. At the same time, the bearing housing, the bearing elastic support and the oil injection outer ring are stacked in sequence from outside to inside and are tightly fitted and connected into a whole in sequence. Thus, this kind of stacked assembly is beneficial to improving the space utilization rate between the bearing housing and the central shaft. Moreover, the bearing housing, the bearing elastic support and the oil injection outer ring are tightly fitted and connected into a whole in sequence. Compared with the existing installation edge structure and bolt connection between the bearing housing, the elastic support and the oil injection ring, etc., the structure of the present invention can effectively reduce the number of parts, reduce the weight and assembly complexity of the engine, and further improve the reliability of the engine, meeting the requirements of high reliability, high performance and high service life of aeroengines; in the compact space shared bearing cavity structure of the present invention, a high-pressure side installation seal integrally seals and connects the high-pressure end of the bearing housing to form a high-pressure side seal end, a low-pressure side installation seal integrally seals and connects the low-pressure end of the bearing housing to form a low-pressure side seal end, and the sealing inner ring located inside the oil injection ring respectively seals and connects the inner ring of the high-pressure side installation seal integration and the inner ring of the low-pressure side installation seal integration. Thus, a sealed bearing cavity is formed among the bearing housing, the high-pressure side installation seal integration, the low-pressure side installation seal integration and the sealing inner ring. Then, high-pressure gas from the periphery can be introduced to seal the bearing cavity, effectively preventing the leakage of lubricating oil in the bearing cavity. At the same time, a structural layout with a common cavity for the high-pressure bearing and the low-pressure bearing is also formed, so that the spatial distribution of the bearing cavity is compact, and both the axial dimension and the radial dimension are small, preferably meeting the size requirements of the engine; in the compact space shared bearing cavity structure of the present invention, through the setting of the lubricating oil delivery channel, it is used to introduce external lubricating oil and make the lubricating oil spray out from the nozzles provided on the oil injection ring and then lubricate the high-pressure bearing and the low-pressure bearing respectively under the ring, thereby improving the bearing lubrication effect of the high-pressure bearing and the low-pressure bearing and increasing their service life.

[0017] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The following will refer to the drawings to further elaborate on the present invention in detail. Brief Description of the Drawings

[0018] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is the schematic cross-sectional front view structure of the compact space shared bearing cavity structure of the preferred embodiment of the present invention; Figure 2 is Figure 1 partial structure schematic in Figure 1 ; Figure 3 is Figure 1 partial structure schematic inFigure 2 ; Figure 4 is Figure 1 partial structure schematic diagram in Figure 3 。

[0019] Legend description: 11. Central shaft; 12. Bearing housing; 13. High-pressure bearing; 14. Low-pressure bearing; 2. Bearing elastic support; 21. First outer convex ring; 3. Oil injection ring; 31. Outer oil injection ring; 32. Sealing inner ring; 321. Reinforcing convex platform; 33. Nozzle; 34. Stop ring; 35. Second outer convex ring; 36. Intermediate ring; 4. High-pressure side installation seal integration; 41. High-pressure bearing installation shaft; 42. High-pressure bearing positioning ring; 43. High-pressure bearing locking assembly; 431. High-pressure side oil collecting groove; 44. High-pressure carbon sealing ring; 45. High-pressure side labyrinth ring; 5. Low-pressure side installation seal integration; 51. Low-pressure bearing installation shaft; 52. Low-pressure bearing positioning ring; 53. Low-pressure bearing locking assembly; 531. Low-pressure side oil collecting groove; 54. Low-pressure carbon sealing ring; 55. Low-pressure side labyrinth ring; 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; 8. Surplus oil delivery channel; 81. Fifth oil delivery hole; 82. Sixth oil delivery hole; 101. First squeeze film; 102. Second squeeze film; 103. Concave-convex matching structure. Specific embodiments

[0020] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the following.

[0021] Refer to Figure 1, A preferred embodiment of the present invention provides a compact space shared bearing cavity structure, comprising: a central shaft 11, a bearing seat 12 spacedly sleeved on the central shaft 11, a bearing spring support 2 installed between the central shaft 11 and the bearing seat 12, an oil injection ring 3 installed between the central shaft 11 and the bearing spring support 2, a high-pressure side installation seal integration 4 and a low-pressure side installation seal integration 5 successively installed on the high-pressure side and the low-pressure side of the central shaft 11, a high-pressure bearing 13 installed on the high-pressure side installation seal integration 4 and with its outer ring tightly pressing against the inner ring of the bearing spring support 2, and a low-pressure bearing 14 installed on the low-pressure side installation seal integration 5 and with its outer ring tightly pressing against the outer oil injection ring 31 of the oil injection ring 3 located on the outside. The bearing seat 12, the bearing spring support 2 and the outer oil injection ring 31 are tightly fitted and connected in sequence to form an integral body. The high-pressure side installation seal integration 4 also seals and connects the high-pressure end of the bearing seat 12 to form a high-pressure side sealed end, the low-pressure side installation seal integration 5 also seals and connects the low-pressure end of the bearing seat 12 to form a low-pressure side sealed end, and the sealing inner ring 32 of the oil injection ring 3 located on the inner side also seals and connects the inner rings of the high-pressure side installation seal integration 4 and the low-pressure side installation seal integration 5 respectively, so as to form a sealed bearing cavity among the bearing seat 12, the high-pressure side installation seal integration 4, the low-pressure side installation seal integration 5 and the sealing inner ring 32. A lubricating oil delivery channel 6 is also provided in the compact space shared bearing cavity structure, and the lubricating oil delivery channel 6 is used to introduce external lubricating oil and make the lubricating oil spray outwards from the nozzles 33 provided on the oil injection ring 3 and then lubricate the high-pressure bearing 13 and the low-pressure bearing 14 under the ring respectively.

[0022] In the compact space shared bearing cavity structure of the present invention, an elastic support structure in the form of a squirrel cage structure, namely the bearing elastic support 2, is provided between the bearings (including the high-pressure bearing 13 and the low-pressure bearing 14) and the bearing housing 12, thereby meeting the requirements of the rotor support stiffness, improving the rotor robustness. At the same time, the bearing housing 12, the bearing elastic support 2, and the oil injection outer ring 31 are sequentially stacked from the outside to the inside and tightly fitted and connected into an integral body. Thus, this kind of stacked assembly is beneficial to improving the space utilization rate between the bearing housing 12 and the central shaft 11. And the bearing housing 12, the bearing elastic support 2, and the oil injection outer ring 31 are tightly fitted and connected into an integral body. Compared with the existing installation edge structure and bolt connection between the bearing housing, the elastic support, and the oil injection ring, etc., the structure of the present invention can effectively reduce the number of parts, reduce the weight and assembly complexity of the engine, and further improve the engine reliability, meeting the requirements of high reliability, high performance, and high service life of the aeroengine. In the compact space shared bearing cavity structure of the present invention, the high-pressure side installation seal integration 4 is hermetically connected to the high-pressure end of the bearing housing 12 to form a high-pressure side seal end, the low-pressure side installation seal integration 5 is hermetically connected to the low-pressure end of the bearing housing 12 to form a low-pressure side seal end, and the sealing inner ring 32 located inside the oil injection ring 3 is respectively hermetically connected to the inner ring of the high-pressure side installation seal integration 4 and the inner ring of the low-pressure side installation seal integration 5. Thus, a sealed bearing cavity is formed between the bearing housing 12, the high-pressure side installation seal integration 4, the low-pressure side installation seal integration 5, and the sealing inner ring 32. 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. At the same time, a structural layout of the high-pressure bearing 13 and the low-pressure bearing 14 sharing the cavity is formed, so that the spatial distribution of the bearing cavity is compact, and both the axial dimension and the radial dimension are small, preferably meeting the engine dimension requirements. In the compact space shared bearing cavity structure of the present invention, through the setting of the lubricating oil delivery channel 6, it is used to introduce external lubricating oil and make the lubricating oil spray outwards from the nozzles 33 provided on the oil injection ring 3 and then lubricate the high-pressure bearing 13 and the low-pressure bearing 14 under the ring respectively, thereby improving the bearing lubrication effect of the high-pressure bearing 13 and the low-pressure bearing 14 and prolonging their service lives.

[0023] Optionally, as Figure 1 and Figure 2As shown, the bearing elastic support 2 is press-fitted into the inner ring of the bearing housing 12, and the oil injection outer ring 31 is press-fitted into the inner ring of the bearing elastic support 2. Moreover, the bearing housing 12 and the bearing elastic support 2, as well as the bearing elastic support 2 and the oil injection outer ring 31, are circumferentially limited by multiple groups of concave-convex fitting structures arranged at circumferential intervals. The low-pressure side of the oil injection outer ring 31 also abuts against the low-pressure side mounting seal assembly 5 through the axially extending stop ring 34 for axial limitation. In this alternative solution, first, the bearing housing 12, the bearing elastic support 2, and the oil injection outer ring 31 are press-fitted pairwise to achieve the preliminary fastening of the three. Then, the bearing housing 12 and the bearing elastic support 2, as well as the bearing elastic support 2 and the oil injection outer ring 31, are circumferentially limited by multiple groups of concave-convex fitting structures 103 arranged at circumferential intervals to further strengthen the fixed connection between the three. Finally, the low-pressure side of the oil injection outer ring 31 abuts against the low-pressure side mounting seal assembly 5 through the axially extending stop ring 34 to achieve the overall axial limitation of the structure (as Figure 1 shown, the principle of axial limitation is: the bearing housing 12 is fixedly arranged. The low-pressure side of the bearing elastic support 2 and the bearing housing 12 are axially limited at the left end along the axis through multiple groups of concave-convex fitting structures 103. The oil injection outer ring 31 is axially limited by multiple groups of concave-convex fitting structures 103 with the bearing elastic support 2 and the abutment of the low-pressure side mounting seal assembly 5, so as to achieve the overall axial limitation of the bearing housing 12, the bearing elastic support 2, and the oil injection outer ring 31).

[0024] In this alternative solution, as Figure 2 shown, the outer ring surface of the low-pressure end of the bearing elastic support 2 has multiple first outer convex rings 21 that are arranged at axial intervals in sequence and protrude outward. The low-pressure end of the bearing elastic support 2 is press-fitted with the inner ring surface of the bearing housing 12 through the multiple first outer convex rings 21. The high-pressure end of the bearing elastic support 2 has a clearance fit with the inner ring surface of the bearing housing 12, and the outer ring of the high-pressure bearing 13 abuts tightly 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 multiple second outer convex rings 35 that are arranged at axial intervals in sequence and protrude outward. The oil injection outer ring 31 is press-fitted with the inner ring surface of the low-pressure end of the bearing elastic support 2 through the multiple second outer convex rings 35, and the outer ring of the low-pressure bearing 14 abuts tightly against the inner ring of the oil injection outer ring 31.

[0025] Optionally, as Figure 2As shown in the figure, the lubricating oil delivery channel 6 includes a main oil delivery channel 61 and an oil delivery channel 62 disposed within the bearing housing 12, a first oil delivery hole 63 and a second oil delivery hole 64 successively opened on the inner walls at both ends of the oil delivery channel 62, a third oil delivery hole 65 opened on the low-pressure end wall surface of the bearing spring support 2, and a fourth oil delivery hole 66 opened on the injection oil outer ring 31. 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 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 communicates with the oil delivery channel 62 to enable the lubricating oil to enter the high-pressure end of the bearing spring support 2 and form a first squeeze film 101 between the inner ring of the bearing housing 12. In this alternative solution, since the low-pressure side of the bearing spring support 2 is tightly and integrally connected to the bearing housing 12 and the injection oil outer ring 31, the high-pressure end of the bearing spring support 2 has a clearance fit with the inner ring surface of the bearing housing 12 to form a first squeeze film 101 therebetween, which is used to reduce the vibration of the high-pressure side of the bearing spring support 2, thereby indirectly suppressing the vibration of the high-pressure bearing 13, extending its service life, and improving its working stability. The second oil delivery hole 64 communicates with 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 successively communicated to enable the lubricating oil to enter between the injection oil outer ring 31 and the outer ring of the low-pressure bearing 14 to form a second squeeze film 102, which is used to suppress the vibration of the low-pressure bearing 14, extend its service life, and improve its working stability.

[0026] Optionally, as Figure 2 shown, the injection oil ring 3 further includes an intermediate ring 36 connected between the injection oil 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 both axial sides of the intermediate ring 36. A plurality of nozzles 33 are respectively disposed on both sides of the intermediate ring 36 and are 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 disposed within the intermediate ring 36, and an injection oil channel 68 disposed within each nozzle 33 and communicating with the first oil delivery channel 67. The oil inlet side of the first oil delivery channel 67 communicates with the third oil delivery hole 65.

[0027] Optionally, as Figure 2 and Figure 3As shown, the high-pressure side mounting seal assembly 4 includes a high-pressure bearing mounting shaft 41, and high-pressure bearing positioning rings 42 and high-pressure bearing locking assemblies 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 circumference of the high-pressure bearing mounting shaft 41, and both ends of its inner ring abut against the high-pressure bearing positioning ring 42 and the high-pressure bearing locking assembly 43 for positioning. In this alternative solution, the high-pressure bearing locking assembly 43 includes a high-pressure lock ring and a high-pressure locking nut arranged in sequence, and the high-pressure locking nut is threadedly connected to the outer circumferential surface of the high-pressure bearing mounting shaft 41 for applying force to make the high-pressure lock ring tightly press against the inner ring of the high-pressure bearing 13.

[0028] Optionally, as Figure 2 and Figure 3 shown, the low-pressure side mounting seal assembly 5 includes a low-pressure bearing mounting shaft 51, and low-pressure bearing positioning rings 52 and low-pressure bearing locking assemblies 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 circumference of the low-pressure bearing mounting shaft 51, and both ends of its inner ring abut against the low-pressure bearing positioning ring 52 and the low-pressure bearing locking assembly 53 for positioning. In this alternative solution, the low-pressure bearing locking assembly 53 includes a low-pressure lock ring and a low-pressure locking nut arranged in sequence, and the low-pressure locking nut is threadedly connected to the outer circumferential surface of the low-pressure bearing mounting shaft 51 for applying force to make the low-pressure lock ring tightly press against the inner ring of the low-pressure bearing 14.

[0029] Furthermore, as Figure 2 and Figure 3 shown, the high-pressure bearing locking assembly 43 is provided with a high-pressure side oil collecting groove 431 facing the corresponding side nozzle 33, and a second oil supply 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 facing the corresponding side nozzle 33, and a third oil supply 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.

[0030] During operation, the lubricating oil received from the bearing housing 12 is divided into two paths. One path of the lubricating oil enters the first non-centered squeeze oil film 101 formed between the bearing housing 12 and the high-pressure end of the bearing spring support 2. The other path flows along the oil supply holes (including the second oil supply hole 64, the third oil supply hole 65, and the fourth oil supply hole 66) provided on the bearing spring support 2 and the oil injection outer ring 31. Part of it enters between the oil injection outer ring 31 and the outer ring of the low-pressure bearing 14 to form the second non-centered 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 part of the lubricating oil enters multiple nozzles 33 of the oil injection ring 3 and is directly injected into the high-pressure side oil collecting groove 431 and the low-pressure side oil collecting groove 531 respectively. Subsequently, the lubricating oil reaches the lower part of the inner rings of the high-pressure bearing 13 and the low-pressure bearing 14 through the second oil supply channel 69 and the third oil supply channel 71 respectively for under-ring lubrication. The under-ring lubrication method has a high oil collection efficiency and can effectively complete the bearing cooling during the operation of the engine.

[0031] Optionally, as Figure 1 and Figure 3 shown, the high-pressure side mounting seal assembly 4 further includes a high-pressure carbon seal ring 44. The high-pressure carbon seal ring 44 is sealingly arranged between the high-pressure bearing positioning ring 42 and the bearing housing 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 supply hole 81 penetrating through both of them. The high-pressure bearing mounting shaft 41 is arranged with a clearance from the sealing inner ring 32 to communicate the fifth oil supply hole 81 and the high-pressure side oil collecting groove 431 to form a surplus oil conveying channel 8, so as to reintroduce the surplus 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 assembly 5 further includes a low-pressure carbon seal ring 54. The low-pressure carbon seal ring 54 is sealingly arranged between the low-pressure bearing positioning ring 52 and the bearing housing 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 supply hole 82 penetrating through both of them. The low-pressure bearing mounting shaft 51 is arranged with a clearance from the sealing inner ring 32 to communicate the sixth oil supply hole 82 and the low-pressure side oil collecting groove 531 to form a surplus oil conveying channel 8, so as to reintroduce the surplus oil in the low-pressure side oil collecting groove 531 into the bearing cavity on the low-pressure side.

[0032] Optionally, as Figure 4 shown, the high-pressure side mounting seal assembly 4 further includes a high-pressure side labyrinth ring 45 that is sealingly connected to the sealing inner ring 32 to form a labyrinth seal. The high-pressure side labyrinth 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 labyrinth ring 55 that is sealingly connected to the sealing inner ring 32 to form a labyrinth seal. The low-pressure side labyrinth 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 realize the cooling and lubrication of the bearings on different rotors in the common bearing cavity, and the oil injection ring 3 has an integrated design with a sealing structure, which has a simple structure. Preferably, as Figure 4As shown, a plurality of axially sequential and outwardly convex reinforcing bosses 321 are provided on the outer circle of the inner sealing ring 32. The reinforcing bosses 321 are used to reduce the vibration caused by labyrinth scraping.

[0033] In the design, the high-pressure carbon sealing ring 44 and the low-pressure carbon sealing ring 54 are respectively in sealing cooperation with the bearing housing 12, the high-pressure bearing positioning ring 42 and the low-pressure bearing positioning ring 52, and the upper end of the bearing cavity is sealed by introducing high-pressure gas; at the same time, the inner sealing ring 32 respectively cooperates with the high-pressure side labyrinth ring 45 and the low-pressure side labyrinth ring 55 to form a labyrinth sealing structure, and high-pressure gas can be introduced to seal the lower end of the bearing to avoid lubricating oil leakage. During operation, the scattered surplus oil that has not entered the lubricating oil delivery channel 6 will enter the bearing cavity through the action of centrifugal force via two surplus oil delivery channels 8, further reducing the risk of lubricating oil leakage.

[0034] Optionally, the preferred embodiment of the present invention further provides an aero-engine, including the compact space shared bearing cavity structure as described in any one of the above. The aero-engine of the present invention can effectively meet the requirements of rotor support stiffness, improve rotor robustness. At the same time, the aero-engine of the present invention can effectively reduce the number of parts, reduce the engine weight and assembly complexity, thereby improving engine reliability and meeting the requirements of high reliability, high performance and long service life of aero-engines; the engine of the present invention can also effectively prevent the lubricating oil in the bearing cavity from leaking out, and make the bearing cavity space distribution compact, with both axial and radial dimensions being relatively small, better meeting the engine size requirements.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compact space-sharing bearing cavity structure, characterized in that, Including: A central shaft (11), a bearing housing (12) sleeved on the central shaft (11) at intervals, a bearing elastic support (2) installed between the central shaft (11) and the bearing housing (12), an oil injection ring (3) installed between the central shaft (11) and the bearing elastic support (2), a high-pressure side installation seal integration (4) and a low-pressure side installation seal integration (5) installed on the high-pressure side and the low-pressure side of the central shaft (11) in sequence, a high-pressure bearing (13) installed on the high-pressure side installation seal integration (4) and with its outer ring tightly pressing against the inner ring of the bearing elastic support (2), and a low-pressure bearing (14) installed on the low-pressure side installation seal integration (5) and with its outer ring tightly pressing against the outer oil injection ring (31) of the oil injection ring (3); The bearing housing (12), the bearing elastic support (2) and the outer oil injection ring (31) are tightly fitted and connected in sequence to form a whole; The high-pressure side installation seal integration (4) also seals and connects the high-pressure end of the bearing housing (12) to form a high-pressure side seal end, the low-pressure side installation seal integration (5) also seals and connects the low-pressure end of the bearing housing (12) to form a low-pressure side seal end, and the sealing inner ring (32) of the oil injection ring (3) located on the inner side also seals and connects the inner rings of the high-pressure side installation seal integration (4) and the low-pressure side installation seal integration (5) respectively, so as to form a sealed bearing cavity among the bearing housing (12), the high-pressure side installation seal integration (4), the low-pressure side installation seal integration (5) and the sealing inner ring (32); A lubricating oil conveying channel (6) is also provided in the compact space sharing bearing cavity structure. The lubricating oil conveying channel (6) is used to introduce external lubricating oil and make the lubricating oil spray outwards 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 under the ring; 2. The compact space shared bearing cavity structure according to claim 1, wherein The bearing elastic support (2) is press-fitted into the inner ring of the bearing housing (12), the outer oil injection ring (31) is press-fitted into the inner ring of the bearing elastic support (2), and circumferential limits are respectively carried out between the bearing housing (12) and the bearing elastic support (2) and between the bearing elastic support (2) and the outer oil injection ring (31) through multiple groups of concave-convex matching structures arranged at circumferential intervals; the low-pressure side of the outer oil injection ring (31) also abuts against the low-pressure side installation seal integration (5) through an axially extending stop ring (34) for axial limit; 3. The compact space shared bearing cavity structure according to claim 2, wherein 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 at intervals along the axial direction and protrude outwards. The low-pressure end of the bearing elastic support (2) is in interference fit with the inner ring surface of the bearing housing (12) through the plurality of first outer convex rings (21). The high-pressure end of the bearing elastic support (2) is in clearance fit with the inner ring surface of the bearing housing (12), and the outer ring of the high-pressure bearing (13) tightly presses against the inner ring of the high-pressure end of the bearing elastic support (2); the outer ring surface of the outer oil injection ring (31) has a plurality of second outer convex rings (35) which are arranged at intervals along the axial direction and protrude outwards. The outer oil injection ring (31) is in interference fit 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) tightly presses against the inner ring of the outer oil injection ring (31).

4. The compact space shared bearing cavity structure according to claim 3, wherein The lubricating oil delivery passage (6) includes a main oil delivery passage (61) and an oil delivery passage (62) disposed within the bearing housing (12), a first oil delivery hole (63) and a second oil delivery hole (64) sequentially opened on the inner walls at both ends of the oil delivery passage (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). 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 passage (61) communicates with the oil delivery passage (62) to allow external lubricating oil to enter the oil delivery passage (62). The first oil delivery hole (63) communicates with the oil delivery passage (62) to allow lubricating oil to enter the first squeezing oil film (101) formed between the high-pressure end of the bearing elastic support (2) and the inner ring of the bearing housing (12). The second oil delivery hole (64) communicates with the oil delivery passage (62), and the second oil delivery hole (64), the third oil delivery hole (65), and the fourth oil delivery hole (66) are sequentially communicated to allow lubricating oil to enter the second squeezing oil film (102) formed between the oil injection outer ring (31) and the outer ring of the low-pressure bearing (14).

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 disposed in the bearing cavities on both axial sides of the intermediate ring (36). A plurality of nozzles (33) are respectively disposed on both sides of the intermediate ring (36) and are connected to the connection between the intermediate ring (36) and the sealing inner ring (32). The lubricating oil delivery passage (6) further includes a first oil delivery passage (67) disposed within the intermediate ring (36), and an oil injection passage (68) disposed within each nozzle (33) and communicating with the first oil delivery passage (67). The oil inlet side of the first oil delivery passage (67) communicates with the third oil delivery hole (65).

6. The compact space shared bearing cavity structure according to claim 1, wherein, The high-pressure side installation seal assembly (4) includes a high-pressure bearing installation 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 installation shaft (41). The high-pressure bearing locking assembly (43) is threadedly connected to the high-pressure bearing installation shaft (41). The high-pressure bearing (13) is installed on the outer circle of the high-pressure bearing installation shaft (41), and both ends of its inner ring respectively abut against the high-pressure bearing positioning ring (42) and the high-pressure bearing locking assembly (43) for positioning. The low-pressure side installation seal assembly (5) includes a low-pressure bearing installation shaft (51), and a low-pressure bearing positioning ring (52) and a low-pressure bearing locking assembly (53) installed at both ends of the low-pressure bearing installation shaft (51). The low-pressure bearing locking assembly (53) is threadedly connected to the low-pressure bearing installation shaft (51). The low-pressure bearing (14) is installed on the outer circle of the low-pressure bearing installation shaft (51), and both ends of its inner ring respectively abut against the low-pressure bearing positioning ring (52) and the low-pressure bearing locking assembly (53) for positioning.

7. The compact space shared bearing cavity structure according to claim 6, wherein, The high-pressure bearing locking assembly (43) is provided with a high-pressure side oil collecting groove (431) facing the corresponding side nozzle (33). 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) for under-ring lubrication of the high-pressure bearing (13); the low-pressure bearing locking assembly (53) is provided with a low-pressure side oil collecting groove (531) facing the corresponding side nozzle (33). 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) for under-ring lubrication of the low-pressure bearing (14).

8. The compact space shared bearing cavity structure according to claim 7, characterized in that, The high-pressure side mounting and sealing integration (4) further includes a high-pressure carbon sealing ring (44). The high-pressure carbon sealing ring (44) is sealingly arranged between the high-pressure bearing positioning ring (42) and the bearing housing (12) to form a high-pressure side sealing end. A fifth oil delivery hole (81) penetrating through both of them is also opened on the high-pressure bearing positioning ring (42) and the high-pressure bearing mounting shaft (41). The high-pressure bearing mounting shaft (41) and the sealing inner ring (32) are arranged with a gap therebetween to communicate the fifth oil delivery hole (81) and the high-pressure side oil collecting groove (431) to form an excess oil delivery channel (8) to reintroduce the excess oil in the high-pressure side oil collecting groove (431) into the bearing cavity; the low-pressure side mounting and sealing integration (5) further includes a low-pressure carbon sealing ring (54). The low-pressure carbon sealing ring (54) is sealingly arranged between the low-pressure bearing positioning ring (52) and the bearing housing (12) to form a low-pressure side sealing end. A sixth oil delivery hole (82) penetrating through both of them is also opened on the low-pressure bearing positioning ring (52) and the low-pressure bearing mounting shaft (51). The low-pressure bearing mounting shaft (51) and the sealing inner ring (32) are arranged with a gap therebetween to communicate the sixth oil delivery hole (82) and the low-pressure side oil collecting groove (531) to form an excess oil delivery channel (8) to reintroduce the excess 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 and sealing integration (4) further includes a high-pressure side labyrinth ring (45) sealingly connected to the sealing inner ring (32) to form a labyrinth seal. The high-pressure side labyrinth ring (45) is fixedly connected to the high-pressure bearing mounting shaft (41); the low-pressure side mounting and sealing integration (5) further includes a low-pressure side labyrinth ring (55) sealingly connected to the sealing inner ring (32) to form a labyrinth seal. The low-pressure side labyrinth ring (55) is fixedly connected to the low-pressure bearing mounting shaft (51).

10. An aeroengine, characterized in that, Comprising the compact space shared bearing cavity structure according to any one of claims 1-9.

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