Variable-gap extrusion oil film damper based on axial stepped oil film ring

Abstract

The invention relates to a variable-clearance extrusion oil film damper based on an axial stepped oil film ring, belongs to the technical field of rotor vibration control, and solves one of the problems that damping adjustment of a rotor supporting structure in the prior art needs repeated disassembly, the test accuracy is low and the consistency is poor. A stepped oil film ring is arranged on the inner wall face of the oil film outer ring, and a plurality of annular step faces with different depths are machined in the axial direction. A damper oil inlet hole and a damper oil outlet hole which are through are formed in the annular step surface; the oil film outer ring sleeves the outer side of the positioning reference part to form an oil film gap; oil is sealed in the oil film gap to form an annular oil film; the axial positions of the oil film outer ring and the positioning reference part are adjustable; annular step surfaces with different depths are switched to be matched with the positioning reference component to form annular oil films with different thicknesses, and different damping gears can be switched. Quick switching of damping gears is achieved by adjusting axial positioning of the oil film inner ring.

Description

Technical Field

[0001] This invention relates to the field of technology, and more particularly to a variable gap extrusion oil film damper based on an axial stepped oil film ring. Background Technology

[0002] In the field of rotor support, SFD (Squeeze Film Damper) is a core vibration reduction and stabilization component for high-speed rotating machinery. As a commonly used rotor vibration control element in high-speed rotating machinery, SFDs are widely used in rotor systems of aircraft engines, gas turbines, and other applications, playing a crucial role in vibration reduction. Traditional SFDs typically rely on fixed structural parameters, meaning their oil film gap cannot be changed once assembled. Therefore, determining an optimal oil film gap (5) suitable for the target operating conditions during the engineering design phase becomes key to improving damper performance. Furthermore, in rotor dynamics research, exploring the influence of different oil film gaps (5) on the vibration characteristics of the rotor system is also a necessary step in optimizing design parameters and improving system stability.

[0003] However, with existing testing methods, researchers must completely disassemble the entire rotor system to replace the extrusion oil film damper of different sizes for each comparative test with different gaps before they can perform precise alignment and dynamic balancing adjustments. The existing testing methods have the following shortcomings: 1) Changing the damping test gear requires repeated disassembly, which takes a long time and has low testing efficiency; 2) Repeated disassembly and assembly will introduce uncontrollable assembly errors, which seriously affect the accuracy of test data; 3) The test repeatability is poor.

[0004] For the reasons mentioned above, there is a need to provide a variable gap squeeze oil film damper to improve the flexibility of installation and disassembly, the reliability of test results, and the repeatability of the test in rotating machinery damper parameter testing. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a variable gap extrusion oil film damper based on an axial stepped oil film ring, in order to solve one of the problems of existing dampers, such as inconvenience in adjusting the damping level, low accuracy of damping test, and poor test consistency caused by repeated disassembly and assembly.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] A variable gap extrusion oil film damper based on an axial stepped oil film ring is characterized by comprising: a cylindrical outer oil film ring with a stepped oil film ring on its inner wall; the stepped oil film ring being multiple annular stepped surfaces of different depths machined along the axial direction of the outer oil film ring; the annular stepped surfaces having damper inlet holes and damper outlet holes penetrating the outer oil film ring; in use, the outer oil film ring is fitted onto the outside of a positioning reference component, and the positioning reference component can cooperate with the annular stepped surfaces to form an oil film gap; oil is sealed in the oil film gap to form an annular oil film; the axial position of the outer oil film ring and the positioning reference component is adjustable; by switching the annular stepped surfaces of different depths to cooperate with the positioning reference component to form annular oil films of different thicknesses, different damping levels can be switched.

[0008] Furthermore, the annular step surface of the stepped oil film ring is provided with three steps, the depths of which are 0.05mm, 0.10mm and 0.15mm respectively.

[0009] Furthermore, the axis of the damper oil inlet and the axis of the damper oil outlet are aligned radially along the outer ring of the oil film.

[0010] Furthermore, the positioning reference component is an annular bushing structure; two sealing expansion rings are arranged side by side on the positioning reference component, and when the positioning reference component mates with the annular stepped surface, the two sealing expansion rings are located on both sides of the damper oil inlet and the damper oil outlet.

[0011] Furthermore, the outer ring of the oil film also includes a mounting flange; the mounting flange is disposed at one end of the outer ring of the oil film and is used for fixed connection with the axial reference component.

[0012] Furthermore, multiple sets of first annular grooves are formed on the outer side of the cylinder wall of the oil film outer ring, and the first annular grooves of each set are respectively located on both sides of the oil inlet hole of the damper; rubber rings are installed in the first annular grooves, and the rubber rings are used to achieve radial sealing between the oil film outer ring and the inner wall of the axial reference component.

[0013] A variable damping rotor support structure includes: an axial reference component, a positioning reference component, and the aforementioned variable clearance extrusion oil film damper based on an axial stepped oil film ring; the axial reference component is a support base, and the positioning reference component is an inner oil film ring or a squirrel cage support structure; the positioning reference component is connected to the rotating shaft via a bearing; the support base and the mounting flange of the outer oil film ring are connected by fastening screws.

[0014] Furthermore, an axial clamping block is provided between the support seat and the mounting flange; by adjusting the length of the axial clamping block, the positioning reference component can be adjusted to mate with different annular step surfaces; the fastening screw passes through the mounting flange, the axial clamping block and the axial reference component in sequence and is fastened to lock the axial position of the outer ring of the oil film, thereby achieving a positional fixation of the oil film gap.

[0015] Furthermore, the upper part of the support seat is provided with a support oil inlet hole, and the lower part of the support seat is provided with a support oil outlet hole; when the mounting flange is connected to the axial reference component, the damper oil inlet hole is connected to the support oil inlet hole, and the damper oil outlet hole is connected to the support oil outlet hole.

[0016] Furthermore, the positioning reference component is an inner oil film ring; a second annular groove is provided on the outer side of the inner oil film ring, and the second annular groove is used to install the sealing expansion ring.

[0017] Furthermore, when the inner oil film ring is a bushing-type inner oil film ring, a bearing end cap is nested inside the support seat; the bearing end cap is fixedly connected to the bushing-type inner oil film ring; when the inner oil film ring is a squirrel cage support structure, the ring at the end of the squirrel cage support structure is used to cooperate with the annular step surface to form an annular oil film.

[0018] The technical solution of the present invention can achieve at least one of the following effects: 1. The present invention provides a variable gap extrusion oil film damper based on an axial stepped oil film ring. By cooperating the stepped oil film ring on the inner wall of the outer oil film ring with the positioning reference component (inner oil film ring or squirrel cage support structure), and adjusting the gap between the annular stepped surface and the positioning reference component, multiple discrete, precise and stable oil film gap positions can be provided, realizing controllable adjustment of the oil film gap of the support structure. This overcomes the inherent positioning uncertainty of continuous adjustment mechanisms, and has precise oil film gap damping adjustment capability and good test repeatability.

[0019] 2. The variable gap compression oil film damper based on the axial stepped oil film ring of the present invention can quickly switch between different oil film gaps by replacing axial clamping blocks of different lengths without completely disassembling the rotor system. This significantly improves the efficiency of oil film gap adjustment, i.e., damping gear switching, and greatly enhances the experimental efficiency of the influence of oil film damping on the vibration system. It can also reduce assembly errors introduced by repeated disassembly and assembly, effectively ensuring the accuracy and repeatability of test data, and has extremely high operational convenience.

[0020] 3. The present invention provides a variable gap extrusion oil film damper based on an axial stepped oil film ring. The whole structure adopts a purely mechanical structure, which can provide high working reliability and environmental adaptability. It does not require a complex control system and has low manufacturing and maintenance costs.

[0021] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0022] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the variable gap extrusion oil film damper of Embodiment 1 of the present invention; Figure 2 This is a cross-sectional schematic diagram of the variable gap extrusion oil film damper in use according to Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the assembly of the variable gap extrusion oil film damper of the present invention with the rotor, bearings, etc. at the oil film gap setting of 0.05mm; Figure 4 This is a schematic diagram of the assembly of the variable gap extrusion oil film damper of the present invention with the rotor, bearings, etc. at the oil film gap setting of 0.10mm; Figure 5 This is a partial enlarged view of the variable gap extrusion oil film damper of the present invention at the first step position (part A); Figure 6 This is a partially enlarged view of the variable gap extrusion oil film damper of the present invention at the second step position (part B); Figure 7 This is a partial enlarged view of the variable gap squeezing oil film damper of the present invention at the third step position (section C); Figure 8 This is a schematic diagram of the assembly of the variable gap extrusion oil film damper of the present invention with the rotor, bearings, etc. at the oil film gap setting of 0.15mm; Figure 9 This is a schematic diagram of the assembly of the variable gap extrusion oil film damper and the squirrel cage support structure of the present invention.

[0024] Figure label: 1-Outer ring of oil film; 2-Axial clamping block; 3-Inner ring of oil film; 4-Fastening screw; 5-Oil film gap; 6-Support seat; 7-Bearing end cover; 8-Locking nut; 9-Pin; 10-Bearing; 11-Stepped oil film ring; 12-Damper oil inlet hole; 13-Damper oil outlet hole; 14-Mounting flange; 15-Shaft; 16-Rubber ring; 17-Sealing expansion ring; 31-Bushing type inner ring of oil film; 32-Squirrel cage support structure; 51-Support oil inlet hole; 52-Support oil return hole; 141-Threaded hole; 142-Oil drain groove. Detailed Implementation

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0026] Example 1 A specific embodiment of the present invention discloses a variable gap extrusion oil film damper based on an axial stepped oil film ring, such as... Figure 1 As shown, it includes: a cylindrical oil film outer ring 1, with a stepped oil film ring 11 on its inner wall surface; the stepped oil film ring 11 consists of multiple annular stepped surfaces of different depths machined along the axial direction of the oil film outer ring 1; the annular stepped surfaces are provided with damper oil inlet holes 12 and damper oil outlet holes 13 penetrating the oil film outer ring 1; in use, the oil film outer ring 1 is fitted onto the outside of a positioning reference component, and the positioning reference component can cooperate with the annular stepped surfaces to form an oil film gap 5; oil is sealed in the oil film gap 5 to form an annular oil film; the axial position of the oil film outer ring 1 and the positioning reference component is adjustable; by switching the annular stepped surfaces of different depths to cooperate with the positioning reference component to form annular oil films of different thicknesses, different damping levels can be switched.

[0027] In this embodiment, the outer ring 1 of the oil film is an integral sleeve structure, and its inner cylinder wall surface is machined with multiple annular stepped surfaces of different diameters along the axial direction, thereby forming an axial stepped structure. The annular stepped surfaces of different diameters are used to cooperate with the positioning reference component to form oil film gaps 5 of different thicknesses, thereby enabling adjustment of the damping level of the variable gap extrusion oil film damper.

[0028] In one specific embodiment of the present invention, such as Figure 1 , Figure 2 As shown, the stepped oil film ring 11 has three steps on its annular stepped surface, with depths of 0.05mm, 0.10mm, and 0.15mm respectively. Figure 3 , Figure 4 As shown, by adjusting the axial installation position of the stepped oil film ring 11, different annular stepped surfaces can be switched to cooperate with the positioning reference component to form the oil film gap 5; specifically, as shown... Figure 5 , Figure 6 , Figure 7 As shown, the thicknesses of the oil film gaps 5 are 0.05mm, 0.10mm and 0.15mm, respectively. After filling the oil film gaps 5 with lubricating oil, different damping effects can be achieved.

[0029] Furthermore, in order to solve the problem of uneven oil distribution in the oil film gap 5, the present invention sets the axis of the damper oil inlet hole 12 and the axis of the damper oil outlet hole 13 to be radially aligned along the outer ring 1 of the oil film. In this embodiment, by designing the damper oil inlet hole 12 and the damper oil outlet hole 13 to be radially aligned, the two are symmetrically arranged at 180° on the annular step surface 11, which achieves the technical effect of improving the uniformity of oil film distribution, thereby ensuring the accuracy of the oil film damping test.

[0030] In one specific embodiment of the present invention, such as Figure 2 As shown, the positioning reference component is an inner oil film ring 3; two sealing expansion rings 17 are arranged side by side on the inner oil film ring 3, and when the inner oil film ring 3 is engaged with the annular step surface, the two sealing expansion rings 17 are located on both sides of the damper oil inlet hole 12 and the damper oil outlet hole 13, respectively.

[0031] Specifically, to prevent incomplete filling of the annular oil film in the gap between the annular stepped surface and the inner oil film ring 3, in this embodiment, a second annular groove is provided on the outer surface of the inner oil film ring 3 for installing a sealing expansion ring 17. The sealing expansion ring 17 seals the oil film gap 5, reducing oil leakage and achieving independence and stability of the oil film gap 5 for each gear position. Preferably, the sealing expansion ring 17 is made of elastic rubber, which can adapt to the different diameters of the annular stepped surface of the stepped oil film ring 11 through its own elastic deformation.

[0032] Specifically, such as Figure 1 As shown, the outer ring 1 of the oil film further includes: a mounting flange 14; the mounting flange 14 is disposed at one end of the outer ring 1 of the oil film and is used for fixed connection with the axial reference component.

[0033] like Figure 1 As shown, multiple sets of first annular grooves are formed on the outer side of the cylinder wall of the oil film outer ring 1, and the two first annular grooves in each set are respectively located on both sides of the oil inlet hole 12 of the damper; rubber rings 16 are installed in the first annular grooves, and the rubber rings 16 are used to achieve radial sealing between the oil film outer ring 1 and the inner wall of the axial reference component. Specifically, the rubber rings 16 are used to achieve radial sealing between the oil film outer ring 1 and the support seat 6 and the axial clamping block 2, preventing oil from leaking out from the gap between the two.

[0034] Furthermore, a sealing expansion ring 17 is provided between the outer ring 1 of the oil film and the positioning reference component; two sealing expansion rings 17 are provided to seal the oil film gap 5. The sealing expansion ring 17 is used to seal the annular oil film, which can effectively isolate adjacent oil chambers, reduce oil crossflow, and ensure the independence of the oil film gap 5 of each gear and the stability of the damping effect.

[0035] In this embodiment, the outer oil film ring 1 is fitted onto the outside of the inner oil film ring 3. The stepped oil film ring 11 is machined with multiple annular stepped surfaces of different diameters. The annular stepped surfaces on the inner side of the stepped oil film ring 11 and the outer surface of the inner oil film ring 3 enclose an oil film gap 5. The thickness of the oil film gap 5 is directly determined by the depth of the corresponding annular stepped surface. By adjusting the axial installation position of the outer oil film ring 1 and the inner oil film ring 3, the thickness of the oil film gap 5 can be adjusted in stages. By axially moving the outer oil film ring 1, the effective oil film gap 5 between the stepped oil film ring 11 and the inner oil film ring 3 can be changed, and different gears can be switched without disassembling the rotor system.

[0036] Specifically, to ensure the uniformity of lubricating oil in the oil film gap, both the damper inlet hole 12 and the damper outlet hole 13 are radially through holes, and are staggered along the circumferential direction of the outer ring 1 of the oil film. The damper inlet hole 12 is radially connected to the support inlet hole 51 of the support seat 6, and is used to introduce the pressure lubricating oil from the external oil supply system into the working oil chamber; the damper outlet hole 13 is radially aligned with the damper inlet hole 12, and the axial position of the damper outlet hole 13 is aligned one-to-one with the annular oil chamber formed by the stepped oil film ring 11 and the inner ring 3 of the oil film, and is used to discharge excess oil during the oil film compression process, provide a supplementary channel for oil film pressure changes, and ensure smooth oil circulation.

[0037] Specifically, the mounting flange 14 is a flange structure at one end of the outer ring 1 of the oil film, and a threaded hole 141 is machined on it. Furthermore, the mounting flange 14 is not a complete circular ring structure in the radial direction, and an oil drain groove 142 of a certain depth is opened at its bottom to collect and guide the lubricating oil leaking axially from the oil film gap 5 to the external oil return system.

[0038] When testing the effect of oil film damping with different clearances on the vibration characteristics of the support system, traditional tests require a time-consuming and lengthy process of rotor system disassembly, reassembly, and dynamic balancing. Figure 2 As shown, the mounting flange 14 of the outer ring 1 of the oil film is fastened to the axial clamping block 2 and the axial reference component by fastening screws 4, and the three can be combined to form a detachable connection structure. By replacing the axial clamping block of different lengths, the axial assembly position of the damper and the axial reference component can be adjusted, thereby realizing the adjustment of the damper's gear. The thickness of the oil film gap 5 can be adjusted without completely disassembling the rotor system.

[0039] On the one hand, the variable gap compression oil film damper based on an axial stepped oil film ring of the present invention can quickly switch between different oil film gaps 5 by replacing axial clamping blocks of different lengths without completely disassembling the rotor system, greatly improving test efficiency; it can also reduce assembly errors introduced by repeated disassembly and assembly, effectively ensuring the accuracy and repeatability of test data. On the other hand, the variable gap compression oil film damper of the present invention only requires replacing the axial clamping block to adjust the oil film gap 5, significantly improving the efficiency of oil film gap 5 adjustment, i.e., damping gear switching, and has extremely high operational convenience.

[0040] Example 2 One specific embodiment of the present invention provides a variable damping rotor support structure, such as... Figure 2 , Figure 3 , Figure 4 As shown, it includes: an axial reference component, a positioning reference component, and a variable gap extrusion oil film damper based on an axial stepped oil film ring in Embodiment 1; the axial reference component is a support seat 6, and the positioning reference component is connected to the rotating shaft 15 through a bearing 10; the support seat 6 and the mounting flange 14 of the outer oil film ring 1 are connected by fastening screws 4.

[0041] Furthermore, in order to adjust the axial position of the damper (i.e., the outer ring of the oil film 1) without disassembling the support 6 and the positioning reference component, in this embodiment, an axial clamping block 2 is provided between the support 6 and the mounting flange 14. By adjusting the length of the axial clamping block 2, the positioning reference component can be adjusted to cooperate with different annular step surfaces. The fastening screw 4 passes through the mounting flange 14, the axial clamping block 2 and the axial reference component in sequence and is fastened to lock the axial position of the outer ring of the oil film 1, thereby achieving a positional fixation of the oil film gap 5.

[0042] When the damper is working, the support seat 6 serves as a fixed axial reference component, providing axial reference positioning for the entire damper. By replacing the axial clamping block 2 with different axial lengths, different annular step surfaces of the stepped oil film ring 11 can be switched to cooperate with the positioning reference component to form annular oil films of different thicknesses, thereby adjusting the working position of the damper. When adjusting the position of the annular step surface, the axial clamping block 2 is clamped between the fixed axial reference component and the mounting flange 14 using the fastening screw 4, which can precisely drive the outer ring 1 of the oil film to generate axial displacement, thereby positioning the stepped oil film ring 11 of the selected depth to the working area corresponding to the inner ring 3 of the oil film, and finally realizing the gear-type rapid switching of the oil film gap 5.

[0043] like Figure 3As shown, the axial clamping block 2 is installed between the mounting flange 14 of the outer oil film ring 1 and the support seat 6, and is connected and fixed by the fastening screw 4. In this embodiment, by replacing the axial clamping block 2 with different axial lengths, the axial working position of the outer oil film ring 1 can be adjusted, and the selected oil film ring can be positioned in the working area, thereby achieving rapid and precise switching of the oil film gap 5 without disassembling the rotor and the main support system. It can be compatible with two mainstream SFDs, namely concentric SFD or non-concentric SFD, without modifying its own main structure, and only by replacing the matching support components. Its purely mechanical structure provides discrete, precise and stable oil film gap 5 positions, overcoming the positioning uncertainty of the continuous adjustment mechanism, and has the characteristics of high test repeatability, convenient operation and reliable operation.

[0044] In one specific embodiment of the present invention, such as Figure 2 As shown, the upper part of the support base 6 is provided with a support oil inlet hole 51 for introducing lubricating oil into the damper oil inlet hole 12 and the oil film gap 5. The lower part of the support base 6 is provided with a support oil outlet hole 52; when the mounting flange 14 is connected to the axial reference component, the damper oil inlet hole 12 communicates with the support oil inlet hole 51, and the damper oil outlet hole 13 communicates with the support oil outlet hole 52.

[0045] Furthermore, the support 6 is provided with an oil storage chamber. The damper oil outlet 13 is connected to the oil storage chamber through the support oil outlet 52, which can guide the lubricating oil flowing out of the damper oil outlet 13 into the oil storage chamber for temporary storage, and then out through the oil guide hole at the bottom of the support 6.

[0046] In one specific embodiment of the present invention, when the positioning reference component is a bushing-type oil film inner ring 31, a bearing end cap 7 is nested inside the support seat 6; the bearing end cap 7 is fixedly connected to the oil film inner ring 3; when the positioning reference component is a squirrel cage support structure 32, the ring at the end of the squirrel cage support structure 32 is used to cooperate with the annular step surface to form an annular oil film.

[0047] In one specific embodiment of the present invention, an axial clamping block 2 with adjustable length is provided to adjust the axial installation position of the outer ring 1 of the oil film without disassembling the axial clamping block 2, thereby realizing the switching of damping gear.

[0048] In this embodiment, the axial clamping block 2 is configured as a first bushing and a second bushing nested together. The second bushing is fitted outside the first bushing, and the two are connected by a threaded connection or a radially installed positioning screw. By adjusting the relative position of the first bushing and the second bushing, the overall length of the axial clamping block 2 can be adjusted, thereby adjusting the axial installation position of the oil film outer ring 1 and the positioning reference component. Specifically, the first bushing is a stepped bushing, with the outer diameter of the large end of the first bushing being equal to the outer diameter of the second bushing; the outer diameter of the small end of the first bushing is equal to the inner diameter of the second bushing. By axially adjusting the distance between the first bushing and the second bushing, the overall length of the axial clamping block 2 can be adjusted, and the axial assembly position of the oil film outer ring 1 and the positioning reference component can be adjusted without disassembling the axial clamping block 2, thereby enabling the damper to switch gears.

[0049] Furthermore, in this embodiment, as Figure 8 , Figure 9 As shown, the positioning reference component is the inner oil film ring 3; the inner oil film ring 3 adopts either a bushing-type inner oil film ring 31 or a squirrel cage support structure 32; the variable clearance of this invention has wide adaptability, without modifying the main structure of the outer oil film ring 1, and can be compatible with two mainstream SFDs simply by changing the specific form of the inner oil film ring 3: when the bushing-type inner oil film ring 31 is used, it can adapt to non-concentric SFDs, such as Figure 8 As shown. When the mouse cage support structure 32 is selected as the positioning reference component, it is adapted to a concentric SFD.

[0050] This invention provides a variable gap compression oil film damper based on an axial stepped oil film ring, offering wide installation adaptability. The positioning reference component, in conjunction with the outer oil film ring 1, can adopt various structural forms. The positioning reference component can flexibly utilize various rotating rotor support components such as a bushing-type inner oil film ring 31, a squirrel cage support structure 32, or a bearing end cap 7. The outer oil film ring 1 can be flexibly installed on various fixed axial reference components such as a support seat 6 via axial clamping blocks 2 and fastening screws 4, adapting to various application scenarios and possessing strong versatility. Simultaneously, its purely mechanical structural scheme is reliable and low-cost, providing a dedicated basic experimental tool for studying the vibration characteristics of SFD rotor-support systems.

[0051] In this invention, the inner oil film ring 3 and the outer oil film ring 1 cooperate to form an oil film gap 5; it can be, but is not limited to, the bearing bushing 31 and the squirrel cage support structure 32 given in this embodiment, or any support component that requires the application of a compression oil film damper, such as the outer ring of a bearing. The "fixed axial reference component" in this embodiment can be, but is not limited to, the support seat 6, or any fixed structure that can provide a stable installation reference, such as an engine load-bearing frame or a test bench bracket.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A variable gap squeeze film damper based on an axial stepped oil film ring, characterized in that, The application relates to a variable-gap extrusion oil film damper based on an axial stepped oil film ring. The stepped oil film ring (11) is provided with three steps, and the depths of the three steps are 0.05mm, 0.10mm and 0.15mm.

2. The axial stepped oil film ring based variable gap squeeze film damper of claim 1, wherein, The axes of the damper oil inlet holes (12) and the axes of the damper oil outlet holes (13) are aligned along the radial direction of the oil film outer ring (1).

3. The variable gap squeeze film damper based on an axial stepped oil film ring according to claim 1 or 2, characterized in that The positioning reference component is provided with two sealing expansion rings (17) arranged side by side, and when the positioning reference component is matched with the stepped ring surface, the two sealing expansion rings (17) are located on the two sides of the damper oil inlet holes (12) and the damper oil outlet holes (13) and are used for sealing the oil film gap (5).

4. The axial stepped oil film ring based variable gap squeeze film damper of claim 3, wherein, The oil film outer ring (1) further comprises a mounting flange (14) arranged at one end of the oil film outer ring (1) and used for fixedly connecting with an axial reference component.

5. The axial stepped oil film ring based variable gap squeeze film damper of claim 4, wherein, The outer side of the cylinder wall of the oil film outer ring (1) is provided with a plurality of groups of first annular grooves, and each group of first annular grooves is located on the two sides of the damper oil inlet holes (12); the first annular grooves are provided with rubber rings (16), and the rubber rings (16) are used for realizing the radial sealing of the oil film outer ring (1) and the inner wall of the axial reference component.

6. The variable gap squeeze film damper based on an axial stepped oil film ring according to claim 4 or 5, characterized in that The application relates to a variable-gap extrusion oil film damper based on an axial stepped oil film ring.

7. A variable-damping rotor support structure, characterized by, The axial reference component is a bearing seat (6), the positioning reference component is connected with a rotating shaft (15) through a bearing (10), and the bearing seat (6) is connected with the mounting flange (14) of the oil film outer ring (1) through fastening screws (4). The upper portion of the bearing seat (6) is provided with a bearing oil inlet hole (51), and the lower portion of the bearing seat (6) is provided with a bearing oil outlet hole (52); the damper oil inlet hole (12) is communicated with the bearing oil inlet hole (51), and the damper oil outlet hole (13) is communicated with the bearing oil outlet hole (52). The positioning reference component is an oil film inner ring (3), and the outer side of the oil film inner ring (3) is provided with a second annular groove used for mounting the sealing expansion ring (17).

8. The variable-damper rotor support structure according to claim 7, characterized by ​ 9. The variable-damper rotor support structure according to claim 8, characterized by ​ 10. The axial stepped oil film ring based variable gap squeeze film damper of claim 9, wherein, When the oil film inner ring (3) is a bushing type oil film inner ring (31), the support seat (6) is internally nested with a bearing end cover (7); the bearing end cover (7) is fixedly connected with the bushing type oil film inner ring (31); when the oil film inner ring (3) is a squirrel cage support structure (32), the end circular ring of the squirrel cage support structure (32) is used to cooperate with the annular stepped surface to form an annular oil film.

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