Squeeze film damper, rotating shaft mounting assembly and aero-engine rotor

Abstract

The invention relates to the technical field of aero-engines, and discloses a squeeze film damper and rotating shaft mounting assembly and an aero-engine rotor. The squeeze film damper is used for a multi-fulcrum rotor with a centering function. The squeeze film damper and rotating shaft mounting assembly comprises a rotating shaft, a bearing, a bearing mounting assembly, a sealing ring, an oil film gap and a lubricating oil passage. An oil film gap is defined by the bearing outer ring, the bearing installation assembly and the sealing ring, the bearing installation assembly forms a lubricating oil passage communicating the outside with the oil film gap, and external lubricating oil can enter the oil film gap through the lubricating oil passage to form an extrusion oil film. According to the squeeze film damper and rotating shaft installation assembly, a centering elastic support is abandoned, the structure is simplified, the weight is reduced, and disassembly and assembly are convenient; the oil film gap is integrated into an enclosed structure of the bearing installation assembly, the bearing outer ring of the bearing and the sealing ring, redundant parts are omitted, the overall structure is further simplified, and the space occupied by installation is reduced.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, specifically to a squeeze film damper and shaft mounting assembly, and an aero-engine rotor. Background Technology

[0002] Aero engines, driven by high performance requirements, operate at increasingly higher speeds, often spanning multiple bending critical speeds. This frequently leads to vibration issues. To reduce rotor system vibration during operation, squeeze film dampers are typically designed at rotor supports. These dampers work by squeezing lubricating oil during rotor rotation, forming a squeeze film that absorbs vibration energy and thus reduces vibration. Based on whether they have a centering elastic support, squeeze film dampers are classified as centering-type and non-centering-type. For squeeze film dampers with a centering elastic support structure, when mounted on a multi-support rotor, the added weight of the centering elastic support structure can cause over-centering in multi-support rotors, and the structure is complex and inconvenient to assemble and disassemble. Summary of the Invention

[0003] In view of this, the present invention provides a squeeze film damper and a shaft mounting assembly to solve the problems of increased weight, potential over-centering for multi-support rotors, and complex structure and inconvenient disassembly and assembly of current squeeze film dampers with their centering elastic support structure, as well as their complex structure. Simultaneously, the present invention provides an aero-engine rotor.

[0004] In a first aspect, the present invention provides a squeeze film damper and a shaft mounting assembly, wherein the squeeze film damper is used for a multi-point rotor with a centering function, and the squeeze film damper and shaft mounting assembly comprises:

[0005] Shaft; A bearing includes an inner bearing ring and an outer bearing ring, wherein the inner bearing ring is fixedly disposed on the outer periphery of the rotating shaft; A bearing mounting assembly is disposed on the outer periphery of the bearing, and the outer ring of the bearing is fixedly disposed on the inner periphery of the bearing mounting assembly; A sealing ring is abutted between the bearing mounting assembly and the bearing outer ring; The bearing outer ring, the bearing mounting assembly, and the sealing ring together form an oil film gap. The bearing mounting assembly has a lubricating oil passage that connects the outside world and the oil film gap. External lubricating oil can enter the oil film gap through the lubricating oil passage to form a squeezed oil film.

[0006] Beneficial effects: This invention provides a novel extrusion oil film damper and shaft mounting assembly. The bearing, bearing mounting assembly, sealing ring, oil film gap, and lubricating oil passage form the extrusion oil film damper. It is used in multi-point support systems for multi-point rotors with centering functions, eliminating the need for a centering elastic support, simplifying the structure, reducing weight, and facilitating assembly and disassembly. Simultaneously, the flexible end-seal design of the sealing ring ensures the airtightness of the oil film gap, allowing the lubricating oil to quickly form a stable extrusion oil film. The hydraulic pressure of the oil film itself provides passive radial constraint on the shaft, replacing part of the radial limiting function of the centering elastic support. Furthermore, the oil film gap is integrated into an enclosed structure of the bearing mounting assembly, the bearing's outer ring, and the sealing ring, eliminating redundant components, further simplifying the overall structure, and reducing the space required for installation.

[0007] In one alternative embodiment, at least two sealing rings are provided, with the two sealing rings respectively disposed on both sides of the lubricating oil passage to form an annular oil film gap between the outer ring of the bearing and the bearing mounting assembly.

[0008] Beneficial effects: The two sealing rings located on both sides of the lubricating oil passage replace the end sealing structure of the traditional centering damper. They are arranged on both sides of the oil film gap to form a flexible end seal, which can effectively prevent lubricating oil leakage and ensure the continuous stability of oil film pressure. Compared with the traditional hard end seal, it has a better effect on maintaining oil film pressure.

[0009] In one alternative embodiment, the outer circumference of the bearing outer ring is provided with an annular groove, and at least a portion of the sealing ring is disposed in the annular groove.

[0010] Beneficial effect: The annular groove provides an installation position for the sealing ring, facilitating stable installation of the sealing ring.

[0011] In one alternative embodiment, the inner circumference of the bearing mounting assembly is provided with a first recess, the first recess being located at the end outlet of the lubricating oil passage. And / or, a second recess is provided on the outer side of the bearing outer ring, and the second recess is provided corresponding to the end outlet position of the lubricating oil passage.

[0012] Beneficial effects: By setting the first and second recesses, the distribution and flow of lubricating oil can be optimized, the stability of oil film pressure can be improved, local dry friction of the oil film can be avoided, and the transmission of bearing support reaction force can be adapted.

[0013] In one alternative embodiment, the bearing mounting assembly includes: Bearing housing; A bearing sleeve is mounted on the bearing housing and located on the outer periphery of the bearing outer ring; The lubricating oil passage has a first section that penetrates the bearing housing and a second section that penetrates the bearing sleeve, with the end of the lubricating oil passage located in the second section.

[0014] Beneficial effects: The bearing housing provides a mounting base for the bearing sleeve, which is used for the stable installation of the oil-lubricated bearing. The lubricating oil enters the oil film gap directly through the first and second sections of the pre-designed lubricating oil passages on the bearing housing and bearing sleeve. The oil path is shorter and the oil supply is more direct, which can quickly form a stable extrusion oil film and improve the vibration damping response speed.

[0015] In one optional embodiment, the rotating shaft has a hollow structure, and the extrusion oil film damper and rotating shaft mounting assembly further includes: A balancing device is fixedly installed in the inner cavity of the rotating shaft, and the outer periphery of the balancing device is contoured to the inner cavity of the rotating shaft.

[0016] Beneficial effects: The balancing device is built into the shaft to compensate for the inherent eccentricity of the rotor and shaft, so that the centrifugal force of the rotor and shaft during rotation can be dynamically balanced, thereby reducing vibration.

[0017] In one optional implementation, the balancing device includes: A fixing part is located at one end of the balancing device, and the fixing part is used to fix the balancing device in the inner cavity of the rotating shaft; Multiple balance blocks are integrally formed on the fixing part and extend along the axial direction of the rotating shaft. The multiple balance blocks are spaced apart from each other along the inner circumference of the rotating shaft.

[0018] Beneficial effects: The balancing device is fixedly installed in the inner cavity of the rotating shaft using a fixed part, and multiple balancing blocks are used to achieve dynamic balance of the centrifugal force when the rotor and the rotating shaft rotate.

[0019] In one optional embodiment, the rotating shaft is provided with a first connecting hole, and the fixing part is provided with a second connecting hole corresponding to the position of the first connecting hole. The first connecting hole and the second connecting hole are connected by a connector so that the balancing device is fixedly installed in the inner cavity of the rotating shaft by the fixing part. And / or, the fixing part is provided with a pull-out claw, which can be driven to drive the balancing device into the inner cavity of the rotating shaft or to be disassembled from the inner cavity of the rotating shaft.

[0020] Beneficial effects: The balancing device is fixedly connected to the rotating shaft via a connecting piece through the second connecting hole on the fixing part and the first connecting hole on the rotating shaft, thus fixing the balancing device in the inner cavity of the rotating shaft. Pull-out claws are provided on the fixing part of the balancing device to facilitate the installation and removal of the balancing device within the inner cavity of the rotating shaft using specialized tooling.

[0021] In one optional embodiment, a positioning boss is provided on the outer side of the rotating shaft, and the positioning boss is located at the opening of the first connecting hole.

[0022] Beneficial effects: The positioning boss can achieve circumferential anti-rotation and radial fixation of the balancing device and the rotating shaft, improve the accuracy and efficiency of disassembly and assembly operations, strengthen the load-bearing capacity of the connection structure, and does not affect the clearance of the rotating shaft to avoid the risk of collision and friction.

[0023] Secondly, the present invention also provides an aero-engine rotor, including the extrusion oil film damper and shaft mounting assembly described in the above embodiments.

[0024] Beneficial effects: Since the aircraft engine rotor includes a squeeze film damper and a shaft mounting assembly, it has the same effect as the squeeze film damper and shaft mounting assembly, which will not be elaborated here. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A cross-sectional view of an extrusion oil film damper and shaft mounting assembly provided by the present invention. Figure 1 ; Figure 2 A cross-sectional view of an extrusion oil film damper and shaft mounting assembly provided by the present invention. Figure 2 ; Figure 3 A schematic diagram of the balancing device provided by the present invention; Figure 4 A cross-sectional view of the rotating shaft and balancing device provided by the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Rotating shaft; 101. First connecting hole; 102. Positioning boss; 2. Bearing; 201. Inner ring of bearing; 202. Outer ring of bearing; 2021. Annular groove; 2022. Second recess; 3. Bearing mounting assembly; 301. Bearing housing; 302. Bearing sleeve; 3021. First recess; 4. Sealing ring; 5. Oil film gap; 6. Lubricating oil passage; 601, first section; 602, second section; 7. Balancing device; 701. Fixing part; 7011. Second connecting hole; 7012. Pull-out claw; 702. Balancing block; 8. Connectors. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The following is combined with Figures 1-4 The following describes embodiments of the present invention.

[0033] According to an embodiment of the present invention, in one aspect, a squeeze film damper and a shaft mounting assembly are provided. The squeeze film damper is used for a multi-point rotor with a centering function, such as... Figure 1 As shown, the extrusion oil film damper and shaft mounting assembly includes: shaft 1, bearing 2, bearing mounting assembly 3, sealing ring 4, oil film gap 5, and lubricating oil passage 6.

[0034] Bearing 2 includes an inner bearing ring 201 and an outer bearing ring 202. The inner bearing ring 201 is fixedly disposed on the outer periphery of the rotating shaft 1. Bearing mounting assembly 3 is disposed on the outer periphery of bearing 2, and the outer bearing ring 202 is fixedly disposed on the inner periphery of bearing mounting assembly 3. Sealing ring 4 is abutted between bearing mounting assembly 3 and outer bearing ring 202. The outer bearing ring 202, bearing mounting assembly 3 and sealing ring 4 together form an oil film gap 5. Bearing mounting assembly 3 forms a lubricating oil passage 6 that connects the outside world and the oil film gap 5. External lubricating oil can enter the oil film gap 5 through the lubricating oil passage 6 to form a squeezed oil film.

[0035] In the above embodiments, the bearing 2, bearing mounting assembly 3, sealing ring 4, oil film gap 5, and lubricating oil passage 6 form a novel extrusion oil film damper, which is used for a multi-support rotor with centering function in a multi-support system. It eliminates the need for a centering elastic support, simplifies the structure, reduces weight, and facilitates disassembly and assembly. At the same time, the flexible end-seal design of the sealing ring 4 ensures the airtightness of the oil film gap 5, allowing the lubricating oil to quickly form a stable extrusion oil film. The hydraulic pressure of the oil film itself forms a passive radial constraint on the shaft 1, replacing part of the radial limiting function of the centering elastic support. Furthermore, the oil film gap 5 is integrated into an enclosed structure of the bearing mounting assembly 3, the bearing outer ring 202 of the bearing 2, and the sealing ring 4, eliminating redundant components, further simplifying the overall structure, and reducing the space occupied for installation.

[0036] The new extrusion oil film damper has significantly reduced its overall weight by eliminating the centering elastic support, thereby reducing the additional load on the rotor system and indirectly improving the smoothness of rotor operation. In conjunction with the sealing ring 4, it offsets the minor impact of the lack of elastic buffer.

[0037] Specifically, the rotating shaft 1 is the rotating shaft structure of an aero-engine rotor. A bearing 2, a sealing ring 4, and a bearing mounting assembly 3 are arranged sequentially around the outer circumference of the rotating shaft 1. An oil passage 6 is provided in the bearing mounting assembly 3. An oil film gap 5 is formed by the bearing mounting assembly 3, the outer ring 202 of the bearing 2, and the sealing ring 4. Thus, the bearing 2, the bearing mounting assembly 3, the sealing ring 4, the oil film gap 5, and the oil passage 6 together form a novel extrusion oil film damper. When the rotor rotates, it extrudes the lubricating oil, forming an extrusion oil film in the oil film gap 5, which absorbs vibration energy and achieves vibration reduction.

[0038] In some embodiments, such as Figure 1 As shown, at least two sealing rings 4 are provided, with the two sealing rings 4 respectively located on both sides of the lubricating oil passage 6, so as to form an annular oil film gap 5 between the bearing outer ring 202 and the bearing mounting assembly 3.

[0039] In the above embodiment, two sealing rings 4, which are respectively located on both sides of the lubricating oil passage 6, replace the end sealing structure of the traditional centering damper and are arranged on both sides of the oil film gap 5 to form a flexible end seal. This effectively prevents lubricating oil leakage and ensures the continuous stability of oil film pressure. Compared with the traditional hard end seal, it has a better effect on maintaining oil film pressure.

[0040] Specifically, the sealing ring 4 is set as a sealing rubber ring.

[0041] In this embodiment, the parameters of the oil film are as follows: Figure 2 As shown in the figure. C is the oil film thickness; R is the oil film radius, i.e., the distance from the center of the oil film to the center of the shaft; L is the oil film length. These parameters can be adjusted according to the rotor dynamics design requirements, i.e., by controlling the mating dimensions of relevant parts to meet different requirements. The oil film stiffness of the support at this location is calculated based on different parameters, and the calculation formula is shown below.

[0042]

[0043] In the above formula, μ is the viscosity of the lubricating oil ( , (where ρ is the kinematic viscosity of the lubricating oil, ρ is the density of the lubricating oil), and ε is the eccentricity. The value is the rotational speed.

[0044] By specifying parameters such as oil film thickness C, radius R, and length L, the dimensions of the control components can be flexibly adjusted to adapt to different rotor dynamic requirements. At the same time, the formula for calculating oil film stiffness is given, and the stiffness can be directly calculated through parameters such as lubricating oil viscosity, eccentricity, and rotational speed. Unlike traditional centering dampers, there is no need to carry out additional stiffness measurement tests, which simplifies the design process.

[0045] In this embodiment, the negative impact of removing the centering elastic support is avoided by limiting the application scenario, optimizing the structure, and precisely designing the parameters. Specifically, the application scenario is clearly defined: the non-centering extrusion oil film damper is only suitable for multi-support rotors that already have centering function. The overall centering of such rotors is achieved by the multi-support system, and there is no need for the damper to provide additional centering elastic support, thus eliminating the need for this structure from the application scenario perspective. The pressure stability of the oil film gap 5 is enhanced: the flexible end-seal design of the sealing ring 4 ensures the airtightness of the oil film cavity, allowing the lubricating oil to quickly form a stable extrusion oil film. The hydraulic pressure of the oil film itself forms a passive radial constraint on the shaft, replacing part of the radial limiting function of the centering elastic support. Precise design and control of oil film parameters: the oil film stiffness is calculated using formulas, and parameters such as oil film thickness, radius, and length are flexibly adjusted according to the overall dynamic characteristics of the rotor system. This allows the oil film stiffness to independently match the rotor's vibration reduction and critical speed requirements, replacing the traditional composite stiffness matching mode of elastic support and oil film combination. Weight compensation after simplification: After removing the centering elastic support, the overall weight of the damper is significantly reduced, which reduces the additional load on the rotor system, indirectly improves the smoothness of rotor operation, and offsets the slight impact of the lack of elastic buffer.

[0046] In some embodiments, such as Figure 1 As shown, the outer circumference of the bearing outer ring 202 is provided with an annular groove 2021, and at least a portion of the sealing ring 4 is provided in the annular groove 2021.

[0047] In the above embodiment, the annular groove 2021 provides an installation position for the sealing ring 4 so as to facilitate the stable installation of the sealing ring 4.

[0048] Specifically, there are two annular grooves 2021, which are located on both sides of the lubricating oil passage 6.

[0049] As an alternative implementation, an annular groove is provided in the inner circumference of the bearing mounting assembly 3, and at least a portion of the sealing ring 4 is disposed in the annular groove.

[0050] In some embodiments, such as Figure 1 As shown, the inner circumference of the bearing mounting assembly 3 is provided with a first recess 3021, which is located at the end outlet of the lubricating oil passage 6; and / or, the outer side of the bearing outer ring 202 is provided with a second recess 2022, which is corresponding to the end outlet position of the lubricating oil passage 6.

[0051] In the above embodiments, by setting the first recess 3021 and the second recess 2022, the distribution and flow of lubricating oil can be optimized, the stability of oil film pressure can be improved, local dry friction of oil film can be avoided, and the transmission of bearing support reaction force can be adapted.

[0052] Specifically, the distribution and flow of lubricating oil are optimized: the first recess 3021 and the second recess 2022 can serve as "buffer storage areas" for lubricating oil, so that the lubricating oil entering from the end outlet of the lubricating oil passage 6 can be quickly and evenly distributed in the oil film gap 5, avoiding local accumulation of lubricating oil or uneven oil supply, and ensuring that a uniformly thick extruded oil film can be formed in the entire circumference when the shaft 1 rotates, thereby improving the uniformity of vibration damping.

[0053] Furthermore, the stability of the oil film pressure is improved: the first recess 3021 and the second recess 2022 can effectively reduce the flow resistance of lubricating oil in the oil film gap 5, reduce the local fluctuation of oil film pressure, and enable the oil film to maintain the designed pressure value. Even if the rotor vibration amplitude changes slightly, the vibration reduction effect of the oil film can remain stable.

[0054] Furthermore, to prevent localized dry friction of the oil film: when the rotor rotates at high speed or deflects slightly radially, the lubricating oil stored in the first recess 3021 and the second recess 2022 can be quickly replenished to the oil film gap 5, preventing localized dry friction of the oil film due to insufficient lubricating oil, protecting the mating surfaces of the bearing outer ring 202 and the bearing mounting assembly 3, and improving the service life of the damper.

[0055] Furthermore, the transmission of bearing support reaction force is adapted: the positions of the first recess 3021 and the second recess 2022 are matched with the transmission direction of the bearing support reaction force, which can reduce the local compression and damage to the oil film during the transmission of the support reaction force, ensure the integrity of the oil film under load, and further improve the vibration reduction effect.

[0056] Furthermore, only the first recess 3021, only the second recess 2022, or both the first recess 3021 and the second recess 2022 can be provided. This embodiment adopts the third configuration.

[0057] In some embodiments, such as Figure 1 As shown, the bearing mounting assembly 3 includes a bearing housing 301 and a bearing sleeve 302.

[0058] The bearing sleeve 302 is mounted on the bearing housing 301 and located on the outer periphery of the bearing outer ring 202; the lubricating passage 6 has a first section 601 that penetrates the bearing housing 301 and a second section 602 that penetrates the bearing sleeve 302, with the end of the lubricating passage 6 located in the second section 602.

[0059] In the above embodiment, the bearing housing 301 provides an installation base for the bearing sleeve 302, which is used for the stable installation of the lubricating bearing. The lubricating oil enters the oil film gap 5 directly through the first section 601 and the second section 602 of the pre-set lubricating oil passage 6 on the bearing housing 301 and the bearing sleeve 302. The oil passage is shorter and the oil supply is more direct, which can quickly form a stable extrusion oil film and improve the vibration reduction response speed.

[0060] Specifically, the bearing housing 301 and the bearing sleeve 302 are fitted together.

[0061] In some embodiments, such as Figure 3 , Figure 4 As shown, the rotating shaft 1 is a hollow structure, and the extrusion oil film damper and rotating shaft mounting assembly also include: a balancing device 7.

[0062] The balancing device 7 is fixedly installed in the inner cavity of the rotating shaft 1, and the outer periphery of the balancing device 7 is set in the same shape as the inner cavity of the rotating shaft 1.

[0063] In the above embodiment, the balancing device 7 is built into the shaft 1 to compensate for the inherent eccentricity of the rotor and the shaft 1, so that the centrifugal force of the rotor and the shaft 1 when rotating can be dynamically balanced, thereby reducing vibration.

[0064] Specifically, when the rotor rotates at high speed, the vibration amplitude, phase and other parameters of the rotor are detected by dynamic balancing test equipment to accurately identify the magnitude and position of the imbalance of the rotor and shaft 1, that is, the circumferential angle and radial position of the rotor and shaft 1. Based on this, a balancing device 7 is arranged in the inner cavity of the shaft 1.

[0065] In some embodiments, such as Figure 3 , Figure 4 As shown, the balancing device 7 includes a fixing part 701 and a plurality of balancing blocks 702.

[0066] The fixing part 701 is located at one end of the balancing device 7 and is used to fix the balancing device 7 in the inner cavity of the rotating shaft 1. A plurality of balancing blocks 702 are integrally formed on the fixing part 701 and extend along the axial direction of the rotating shaft 1. The plurality of balancing blocks 702 are spaced apart from each other along the inner circumference of the rotating shaft 1.

[0067] In the above embodiment, the balancing device 7 is fixedly installed in the inner cavity of the rotating shaft 1 by the fixing part 701, and the centrifugal force of the rotor and the rotating shaft 1 is dynamically balanced by the multiple balancing blocks 702.

[0068] Specifically, based on the unbalanced position obtained from the dynamic balancing test equipment, the corresponding circumferential position of the balancing device 7 is matched; then, the balancing module on one side of the fixed part 701 in the balancing device 7 is evenly cut into four equal parts to achieve precise circumferential positioning; the balancing module that needs to remove material is determined to remove material at the position opposite to the unbalance amount, thereby reducing the mass at that position to offset the original eccentricity of the rotor; the balancing module is specifically cut into four balancing blocks 702 through four U-shaped grooves.

[0069] In some embodiments, such as Figure 3 , Figure 4As shown, the rotating shaft 1 is provided with a first connecting hole 101, and the fixing part 701 is provided with a second connecting hole 7011 corresponding to the position of the first connecting hole 101. The first connecting hole 101 and the second connecting hole 7011 are connected by a connector 8 so that the balancing device 7 can be fixedly installed in the inner cavity of the rotating shaft 1 by the fixing part 701.

[0070] In the above embodiment, the balancing device 7 is fixedly connected by the connector 8 through the second connecting hole 7011 on the fixing part 701 and the first connecting hole 101 on the rotating shaft 1, so as to fix the balancing device 7 in the inner cavity of the rotating shaft 1.

[0071] Specifically, the second connecting hole 7011 on the fixing part 701 and the first connecting hole 101 on the rotating shaft 1 are configured as pin holes, and the connecting piece 8 is configured as a pin.

[0072] In some embodiments, such as Figure 3 , Figure 4 As shown, the fixing part 701 is provided with a pull-out claw 7012, which can be driven to drive the balancing device 7 into the inner cavity of the rotating shaft 1 or to be removed from the inner cavity of the rotating shaft 1.

[0073] In the above embodiment, a pull-out claw 7012 is provided on the fixing part 701 of the balancing device 7 to facilitate the assembly and disassembly of the balancing device 7 in the inner cavity of the rotating shaft 1 using a special tool.

[0074] Specifically, the balancing device 7 at the corresponding position is removed from the inner cavity of the rotating shaft 1 by using a special tooling clamp to connect and remove the unloading claw 7012. The material is then precisely removed by machining, and the removal mass is determined based on the amount of imbalance. After reassembly, the center of mass of the rotor will return to the center of the rotating shaft, achieving high-speed dynamic balancing. If the rotor subsequently develops new imbalances due to wear, assembly, etc., the above operation can be repeated to achieve secondary balancing.

[0075] It should be noted that the built-in balancing device 7 in the inner cavity of the rotating shaft 1 does not contradict the weight reduction design of the extrusion oil film damper and the rotating shaft mounting assembly. The reason is as follows: The core purpose of using a hollow structure for the rotating shaft 1 is to reduce weight. While adding a balancing device 7 inside the shaft 1 might seem to increase mass and contradict the weight reduction goal, this embodiment fundamentally resolves this contradiction through structural design optimization and overall weight offsetting, achieving a weight reduction effect superior to traditional structures. Specifically: Firstly, in order to achieve dynamic balance, traditional technology requires a pre-set balancing boss (a solid protrusion structure that is part of the shaft) on the outer wall of the shaft 1. This balancing boss is a fixed and non-removable structure. Even after the dynamic balancing is completed and the material is removed, the remaining boss will still occupy the weight and space of the shaft. In this embodiment, the balancing device 7 built into the shaft 1 is an independent structure that replaces the balancing boss. It is not an additional component added to the original hollow shaft, but rather the balancing boss on the outer wall is eliminated and the balancing surface is moved to the inner cavity. The overall mass of the balancing device 7 is much smaller than the solid mass of the traditional balancing boss, achieving structural optimization of "replacing the heavy with the light" without adding extra weight.

[0076] Secondly, traditional balancing bosses require a sufficiently large solid protrusion size to ensure sufficient space for material removal operations. This not only results in a large weight of the boss itself, but also necessitates a larger safety margin in the clearance design between shafts 1 due to the protrusion on the outer wall of the shaft 1, indirectly increasing the overall structural size and weight of the engine. In this embodiment, by eliminating the outer wall balancing boss, the outer wall of shaft 1 becomes a smooth structure, allowing for a reasonable reduction in the safety clearance between shafts 1. The size and weight of the related mating structures of the entire machine can be optimized simultaneously, achieving a chain effect of "local structural optimization leading to overall machine weight reduction," thus far exceeding the impact of the balance block's own mass.

[0077] Third, the balance block 702 in this embodiment adopts a split design and, in order to fit the inner cavity space of the rotating shaft 1, adopts a lightweight structural size design. The material is consistent with the rotating shaft 1, but the volume is much smaller than that of the traditional solid balance boss, which further reduces its own mass and reduces the mass ratio from the structure itself.

[0078] In summary, the balancing device 7 built into the shaft 1 in this embodiment has a better weight reduction effect compared with the traditional combination structure of hollow shaft and balancing boss, while avoiding the risk of collision and friction.

[0079] In some embodiments, such as Figure 3 , Figure 4 As shown, a positioning boss 102 is provided on the outer side of the rotating shaft 1, and the positioning boss 102 is located at the opening of the first connecting hole 101.

[0080] In the above embodiments, the positioning boss 102 can achieve circumferential anti-rotation and radial fixation of the balancing device 7 and the rotating shaft 1, improve the accuracy and efficiency of disassembly and assembly operations, strengthen the load-bearing capacity of the connection structure, and not affect the clearance of the rotating shaft 1 to avoid the risk of collision and friction.

[0081] Specifically, the balancing device 7 and the rotating shaft 1 are circumferentially prevented from rotating and radially fixed: the balancing device 7 and the rotating shaft 1 are connected by a connector 8, i.e., a pin. The positioning boss 102 at the pin provides a precise installation positioning surface and a matching groove for the pin, so that the pin can be firmly engaged between the rotating shaft 1 and the balancing device 7. This effectively prevents the balancing device 7 from rotating circumferentially or radially due to centrifugal force when the rotor rotates at high speed, ensuring the positional stability of the balancing device 7 and avoiding new rotor imbalance caused by the displacement of the balancing device 7.

[0082] Furthermore, the precision and efficiency of disassembly and assembly operations are improved: the positioning boss 102 provides a precise force application point and positioning reference for the special tooling that works with the pull-out claw 7012. When removing or reinstalling the balancing device 7, the special tooling can quickly dock with the positioning boss 102 to achieve precise disassembly and installation of the balancing device 7, avoiding damage to the inner cavity of the rotating shaft 1 and the balancing device 7 during the disassembly and assembly process. At the same time, it ensures that the circumferential position of the balancing device 7 is consistent with its original position after reinstallation, ensuring that the dynamic balance effect is not lost.

[0083] Furthermore, the load-bearing capacity of the connection structure is enhanced: when the rotor rotates at high speed, the balancing device 7 will be subjected to huge centrifugal force. The positioning boss 102 at the pin is a solid reinforced structure, which can disperse the shear force and extrusion force on the pin, prevent the pin from breaking due to stress concentration, improve the overall load-bearing capacity and reliability of the connection structure, and adapt to the high-speed and high-load working conditions of aero-engines.

[0084] Furthermore, to avoid the risk of collision and friction, the positioning boss 102 is a small local protrusion, distributed only at the pin connection position, and located in the circumferential non-radial opposing position of the rotating shaft 1. It does not change the overall radial shape of the rotating shaft 1, so it does not reduce the safety clearance between each rotating shaft 1. Structurally, it avoids the collision and friction problem of traditional balancing bosses, which is consistent with the original design intention of the balancing device 7.

[0085] Furthermore, the positioning boss 102 is designed to be lightweight: in order to further meet the weight reduction target, the positioning boss 102 at the pin can be designed as needed, that is, only retain the minimum size to meet the pin connection and special tooling operation, without any extra solid allowance, thereby minimizing the weight of the positioning boss 102 itself and avoiding affecting the weight reduction effect of the rotating shaft 1.

[0086] According to an embodiment of the present invention, another aspect provides an aircraft engine rotor, including the extrusion oil film damper and shaft 1 mounting assembly described above.

[0087] In the above embodiments, since the aero-engine rotor includes a squeeze film damper and a shaft mounting assembly, it has the same effect as the squeeze film damper and shaft mounting assembly, and will not be described again here.

[0088] This embodiment also proposes a full-scale simulated rotor design method, the specific steps of which are as follows: 1. The materials of the main components are consistent with those of the actual rotor; 2. Replace the blades with a solid axisymmetric structure to ensure that the main mass inertial parameters (center of mass, mass, and radius of gyration) of the power turbine disk are consistent with those of the real turbine rotor; 3. The fit and connection structure between the main components are consistent with the actual rotor; 4. Compared with the real rotor, the dynamic characteristics of the simulated rotor are basically the same, and the calculation error of the critical speed is no more than 5%.

[0089] The full-size simulated rotor design method proposed in this embodiment can reflect the dynamic characteristics of the real rotor to the greatest extent, significantly reduce the development costs of processing and testing, and reduce the risk of using real rotor testing.

[0090] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A pressure film damper and shaft mounting assembly, characterized in that, The extrusion oil film damper is used in a multi-point rotor with centering function, and the extrusion oil film damper and shaft mounting assembly includes: Rotating shaft (1); The bearing (2) includes an inner bearing ring (201) and an outer bearing ring (202), wherein the inner bearing ring (201) is fixedly disposed on the outer periphery of the rotating shaft (1); A bearing mounting assembly (3) is disposed on the outer periphery of the bearing (2), and the outer ring (202) of the bearing is fixedly disposed on the inner periphery of the bearing mounting assembly (3); A sealing ring (4) is abutted between the bearing mounting assembly (3) and the bearing outer ring (202); The bearing outer ring (202), the bearing mounting assembly (3) and the sealing ring (4) together form an oil film gap (5). The bearing mounting assembly (3) forms a lubricating oil passage (6) that connects the outside world and the oil film gap (5). External lubricating oil can enter the oil film gap (5) through the lubricating oil passage (6) to form a squeezed oil film.

2. The extrusion oil film damper and shaft mounting assembly according to claim 1, characterized in that, At least two sealing rings (4) are provided, with the two sealing rings (4) respectively located on both sides of the lubricating oil passage (6) to form an annular oil film gap (5) between the outer ring (202) of the bearing and the bearing mounting assembly (3).

3. The extrusion oil film damper and shaft mounting assembly according to claim 2, characterized in that, The outer circumference of the bearing outer ring (202) is provided with an annular groove (2021), and at least a portion of the sealing ring (4) is disposed in the annular groove (2021).

4. The extrusion oil film damper and shaft mounting assembly according to claim 1, characterized in that, The bearing mounting assembly (3) has a first recess (3021) in its inner circumference, and the first recess (3021) is located at the end outlet of the lubricating oil passage (6). And / or, the outer side of the bearing outer ring (202) is provided with a second recess (2022), which is provided in accordance with the end outlet position of the lubricating oil passage (6).

5. The extrusion oil film damper and shaft mounting assembly according to any one of claims 1, 2, and 4, characterized in that, The bearing mounting assembly (3) includes: Bearing housing (301); A bearing sleeve (302) is mounted on the bearing housing (301) and located on the outer periphery of the bearing outer ring (202); The lubricating passage (6) has a first section (601) penetrating the bearing housing (301) and a second section (602) penetrating the bearing sleeve (302), with the end of the lubricating passage (6) located in the second section (602).

6. The extrusion oil film damper and shaft mounting assembly according to claim 1, characterized in that, The rotating shaft (1) is a hollow structure, and the extrusion oil film damper and rotating shaft mounting assembly further includes: The balancing device (7) is fixedly installed in the inner cavity of the rotating shaft (1), and the outer periphery of the balancing device (7) is set in the same shape as the inner cavity of the rotating shaft (1).

7. The extrusion oil film damper and shaft mounting assembly according to claim 6, characterized in that, The balancing device (7) includes: A fixing part (701) is located at one end of the balancing device (7), and the fixing part (701) is used to fix the balancing device (7) in the inner cavity of the rotating shaft (1); Multiple balance blocks (702) are integrally formed on the fixing part (701) and extend along the axial direction of the rotating shaft (1). The multiple balance blocks (702) are spaced apart from each other along the inner circumference of the rotating shaft (1).

8. The extrusion oil film damper and shaft mounting assembly according to claim 7, characterized in that, The rotating shaft (1) is provided with a first connecting hole (101), and the fixing part (701) is provided with a second connecting hole (7011) corresponding to the position of the first connecting hole (101). The first connecting hole (101) and the second connecting hole (7011) are connected by a connector (8) so that the balancing device (7) can be fixedly installed in the inner cavity of the rotating shaft (1) by the fixing part (701). And / or, the fixing part (701) is provided with a pull-out claw (7012), which can be driven to drive the balancing device (7) into the inner cavity of the rotating shaft (1) or disassembled from the inner cavity of the rotating shaft (1).

9. The extrusion oil film damper and shaft mounting assembly according to claim 8, characterized in that, The outer side of the rotating shaft (1) is provided with a positioning boss (102), which is located at the opening of the first connecting hole (101).

10. An aircraft engine rotor, characterized in that, Includes the extrusion oil film damper and shaft mounting assembly as described in any one of claims 1-9.

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