Multilayer oil film integral type squeeze oil film damper

Abstract

The utility model provides a multilayer oil film integral type squeeze oil film damper which comprises an outer flange and an inner flange, and an oil inlet groove and an oil inlet hole are formed in the outer flange. The outer flange and the inner flange are connected through a plurality of supporting parts, and the supporting parts are evenly distributed in the circumferential direction of the extrusion oil film damper. Oil film lines are arranged on the supporting part and are in a sawtooth shape. And extrusion oil film areas are arranged among the plurality of supporting parts. According to the multilayer oil film integral type extrusion oil film damper, elastic supporting and oil film lines are integrated, the structure is simple, the multilayer independent extrusion oil films of the wide oil film area effectively avoid the vibration problem caused by highly nonlinear oil film force, and the damping vibration attenuation effect is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration damping of aero-engines, and particularly relates to a multi-layer oil film integral squeeze film damper. Background Art

[0002] As the core power source of an aircraft, the performance of an aero-engine directly determines important indicators such as the thrust and endurance of the aircraft. With the rapid development of civil airliners, multi-faceted requirements such as high thrust-to-weight ratio, high endurance mileage, high safety, and low fuel consumption rate are put forward for a new generation of aero-engines, which brings severe challenges to the stability of the rotor-bearing system.

[0003] Vibration is the main cause of increased load, shortened life, and structural strength failure of the rotor system, and almost all engines are troubled by vibration problems.

[0004] At present, the commonly used solution is to set a squeeze film damper (SFD) at the support to achieve the damping and vibration reduction effect.

[0005] A squeeze film damper is a damper that effectively suppresses vibration through the extrusion and shearing effects of the oil film generated by the movement and radial movement of the damper journal (inner ring). Its basic working principle is as follows: a gap is reserved between the journal of the squeeze film damper and the bearing housing, and the rotation of the journal is restricted by pins or elastic supports. The gap is filled with lubricating oil, and through the extrusion of the oil film in the annular gap and the viscous friction damping generated by the circumferential flow of the oil body, the kinetic energy is converted into the internal energy of the oil body, thereby achieving the vibration reduction effect.

[0006] However, the existing squeeze film dampers are prone to nonlinear vibration phenomena such as locking, bistable response, non-coordinated precession, and even chaotic motion. Moreover, the existing squeeze film dampers are relatively heavy and require a large axial installation space.

[0007] In view of this, the inventor of the present application designed a multi-layer oil film integral squeeze film damper in order to overcome the above technical problems. Summary of the Utility Model

[0008] The technical problem to be solved by the utility model is to overcome the defects that the existing squeeze film dampers are prone to nonlinear vibration phenomena such as locking, bistable response, non-coordinated precession, and even chaotic motion, and the existing squeeze film dampers are relatively heavy and require a large axial installation space, and to provide a multi-layer oil film integral squeeze film damper.

[0009] The utility model solves the above technical problems through the following technical solutions:

[0010] The utility model provides a multi-layer oil film integral squeeze film damper, which is characterized in that the squeeze film damper comprises an outer flange and an inner flange, an oil inlet groove and an oil inlet hole are arranged on the outer flange; the outer flange and the inner flange are connected by a plurality of supporting parts, and the plurality of supporting parts are evenly distributed along the circumference of the squeeze film damper; oil film lines are arranged on the supporting parts, and the oil film lines are sawtooth-shaped; and squeeze film areas are arranged between the plurality of supporting parts.

[0011] According to one or more embodiments of the utility model, the oil film texture is hollowed out on the support portion, and the serrated oil film texture includes slits staggered on both sides of the support portion; the oil film texture enables the support portion to form an elastic support structure.

[0012] According to one or more embodiments of the present utility model, the oil inlet groove is arranged on the entire outer circumference of the outer flange; the oil inlet groove is a strip-shaped groove, which is centrally distributed along the circumference of the outer flange.

[0013] According to one or more embodiments of the present utility model, the oil inlet hole is arranged in the oil inlet groove; the oil inlet hole is a radial oil hole, which is evenly distributed in the center along the outer circumference of the outer flange; the oil inlet hole and the oil film texture are interconnected, and are used to supply oil to the oil film texture and the extrusion oil film area.

[0014] According to one or more embodiments of the present invention, the squeeze oil film area is divided into independent chambers by the support portion, the inner flange and the outer flange.

[0015] According to one or more embodiments of the present invention, the number of slits in the oil film pattern is 5 to 23.

[0016] According to one or more embodiments of the present invention, the slit gap of the oil film pattern is 0.5 to 2.5 mm.

[0017] According to one or more embodiments of the present invention, the number of the oil film patterns is equal to the number of the oil inlet holes, and the two are configured in a one-to-one correspondence, and the number of the oil film patterns and the number of the oil inlet holes are both even numbers.

[0018] According to one or more embodiments of the present utility model, the center line of each oil inlet hole forms a first angle with the center line of the squeeze film damper, the symmetry line of the oil film pattern corresponding to each oil inlet hole forms a second angle with the center line of the squeeze film damper, and the first angle is equal to the second angle.

[0019] According to one or more embodiments of the present utility model, the cross-sectional area of ​​the squeeze film zone accounts for 11% to 30% of the cross-sectional area of ​​the entire squeeze film damper.

[0020] According to one or more embodiments of the present utility model, the squeeze film damper is integrally machined by wire electrical discharge machining technology.

[0021] The positive and progressive effects of the present utility model are as follows:

[0022] The multi-layer oil film integral squeeze film damper of the present utility model has at least the following advantages:

[0023] First, the multi-layer oil film integral squeeze film damper of the present utility model can effectively solve the vibration problem caused by the highly non-linear oil film, and has good vibration reduction effect and high safety.

[0024] Second, the multi-layer oil film integral squeeze film damper of the present utility model has multi-layer oil films and a wide squeeze film area, and can achieve various damping objectives by adjusting the number and gap of the oil film slits to meet the requirements of various engineering applications.

[0025] Third, the multi-layer oil film integral squeeze film damper of the present utility model integrates the elastic support and the oil film pattern, has a simple structure, is easy to machine, has a low weight, low cost, and is convenient to install, and is suitable for the situation of severe space limitation inside an aeroengine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above-mentioned and other features, properties, and advantages of the present utility model will become more obvious through the following description in conjunction with the drawings and embodiments. In the drawings, the same reference numerals always represent the same features, where:

[0027] Figure 1 is a three-dimensional schematic diagram of the multi-layer oil film integral squeeze film damper of the present utility model.

[0028] Figure 2 is a cross-sectional schematic diagram of the multi-layer oil film integral squeeze film damper of the present utility model.

[0029] Figure 3 is a longitudinal-sectional schematic diagram of the multi-layer oil film integral squeeze film damper of the present utility model.

[0030]

REFERENCE MARKS

[0031] Outer flange 100

[0032] Oil inlet groove 110

[0033] Oil inlet hole 120

[0034] Inner flange 200

[0035] Supporting part 300

[0036] Oil film pattern 310

[0037] Slit 311

[0038] Squeeze film region 400

[0039] First included angle α1

[0040] Second included angle α2 Detailed implementation manners

[0041] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model will be given in conjunction with the accompanying drawings.

[0042] Now, embodiments of the present utility model will be described in detail with reference to the accompanying drawings. Now, preferred embodiments of the present utility model will be described in detail, and examples thereof are shown in the accompanying drawings. In any possible case, the same reference numerals will be used throughout all the drawings to represent the same or similar parts. In addition, although the terms used in the present utility model are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present utility model may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present utility model not only through the actual terms used, but also through the meaning implied by each term.

[0043] As Figures 1 to 3 shown, a multi-layer oil film integral squeeze film damper, the squeeze film damper includes an outer flange 100 and an inner flange 200,

[0044] An oil inlet groove 110 and an oil inlet hole 120 are provided on the outer flange 100;

[0045] The outer flange 100 and the inner flange 200 are connected by a plurality of supporting parts 300, and the plurality of supporting parts 300 are evenly distributed along the circumferential direction of the squeeze film damper;

[0046] An oil film pattern 310 is provided on the supporting part 300, and the oil film pattern 310 is serrated;

[0047] A squeeze film region 400 is provided between the plurality of supporting parts 300.

[0048] Preferably, the multi-layer oil film integral squeeze film damper is integrally in a ring-shaped metal ring structure, the cross-section is annular, and the oil inlet hole 120 and the oil film pattern 310 at the longitudinal section form a T-shaped structure.

[0049] The multi-layer oil film integral squeeze film damper of the present utility model has a simple structure, and the multi-layer independent squeeze films in its wide oil film region effectively avoid the vibration problems caused by the highly non-linear oil film force, and significantly improve the damping and vibration reduction effect.

[0050] AsFigures 1 to 3 As shown in the figure, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present utility model, the oil film pattern 310 is machined in a hollow manner on the support portion 300. The serrated oil film pattern 310 includes slits 311 that are alternately arranged on both sides of the support portion 300; the oil film pattern 310 forms an elastic support structure for the support portion 300.

[0051] The setting of the oil film pattern 310 reduces the rigidity of the support portion 300, making the support portion 300 exhibit the characteristics of an elastic support structure. Thus, the oil film pattern 310 and the elastic support are integrated, and the elastic support structure can be used to adjust the critical speed of the rotor system.

[0052] It should be noted that the elastic support and the oil film pattern 310 are integrally designed, that is, the oil film pattern 310 also undertakes the role of elastic support at the same time, and the elastic support and the oil film pattern 310 are not two independent structures.

[0053] The oil film pattern 310 is machined in a hollow manner within the circumferential region of the squeeze film damper of the present utility model. The oil film pattern 310 is composed of an interlaced serrated structure and is evenly distributed along the circumference of the squeeze film damper of the present utility model.

[0054] The oil film pattern 310 and the elastic support are integrated, and have both damping and support functions. It is evenly distributed along the circumference of the squeeze film damper and is composed of an interlaced serrated structure.

[0055] As Figures 1 to 3 shown, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present utility model, the oil inlet groove 110 is provided on the entire outer circumference of the outer flange 100; the oil inlet groove 110 is a strip-shaped groove and is centered along the circumference of the outer flange 100.

[0056] The oil inlet groove 110 is machined on the outside of the squeeze film damper of the present utility model as an entire circumferential strip-shaped groove centered along the circumference. The oil inlet groove 110 can store a certain amount of oil body to avoid instantaneous oil shortage around the oil inlet hole 120 under special conditions such as high speed, excessive load, and unbalanced conditions, which will exacerbate the vibration of the rotor system.

[0057] As Figures 1 to 3 shown, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present utility model, the oil inlet hole 120 is provided in the oil inlet groove 110; the oil inlet hole 120 is a radial oil hole and is evenly distributed centered along the outer circumference of the outer flange 100; the oil inlet hole 120 communicates with the oil film pattern 310 and is used to supply oil to the oil film pattern 310 and the squeeze film area 400.

[0058] The oil inlet hole 120 is machined in the oil inlet groove 110 and is a radial oil hole that is evenly distributed circumferentially and centered on the outer circumference of the squeeze film damper of the present utility model. The oil inlet hole 120 communicates with the oil film pattern 310 and supplies oil to the oil film pattern 310 and the squeeze film area 400.

[0059] As Figure 1 , Figure 2 shown, eight radial oil inlet holes 120 with a diameter of 3 mm are machined in the oil inlet groove 110 and are evenly distributed circumferentially and centered. The oil inlet holes 120 communicate with the oil film patterns 310 and supply oil to the eight oil film patterns 310. The central line of each oil inlet hole 120 and the symmetry line of the corresponding oil film pattern 310 form an angle of 45° with the center line of the squeeze film damper.

[0060] The external oil supply pipeline supplies oil to the closed area formed by the oil inlet groove and the outer housing, and the oil body fills the entire oil film pattern 310 and the squeeze film area 400 through the oil inlet holes 120.

[0061] As Figures 1 to 3 shown, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present utility model, the squeeze film area 400 is divided into independent chambers by the supporting part 300, the inner flange 200, and the outer flange 100.

[0062] The squeeze film area 400 is divided into independent chambers by the supporting part 300 and its oil film pattern 310, the inner flange 200, and the outer flange 100.

[0063] Preferably, the oil film adopted by the squeeze film damper of the present utility model is a multi-layer oil film, which can be realized by adjusting the serrated structure of the oil film pattern 310 according to the vibration reduction target.

[0064] As Figures 1 to 3 shown, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present utility model, the number of slits 311 of the oil film pattern 310 is 5 to 23.

[0065] As Figures 1 to 3 shown, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present utility model, the gap between the slits 311 of the oil film pattern 310 is 0.5 to 2.5 mm.

[0066] Preferably, the oil film pattern 310 of the multi-layer oil film integral squeeze film damper of the present utility model is a seven-layer oil film, the number of its slits 311 is, the gap between the slits 311 is 2 mm, and in engineering applications, the serrated structure can be changed by adjusting the number and gap of the slits 311 to achieve the damping target.

[0067] Preferably, the supporting part 300 of the multi-layer oil film integral squeeze film damper of the present invention, its oil film pattern 310, inner flange 200 and outer flange 100 divide the squeeze film damper into 8 independent squeeze film areas 400. The area of the squeeze film area 400 accounts for 21% of the cross-sectional area of the entire squeeze film damper. The wide oil film area can make full use of the viscosity of the lubricating oil to generate a damping effect and dissipate vibration energy.

[0068] As Figures 1 to 3 shown, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present invention, the number of the oil film patterns 310 is equal to that of the oil inlet holes 120, and the two are arranged in one-to-one correspondence. The numbers of both the oil film patterns 310 and the oil inlet holes 120 are even numbers.

[0069] As Figures 1 to 3 shown, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present invention, the center line of each oil inlet hole 120 forms a first included angle α1 with the center line of the squeeze film damper, and the symmetry line of the oil film pattern 310 corresponding to each oil inlet hole 120 forms a second included angle α2 with the center line of the squeeze film damper. The first included angle α1 and the second included angle α2 are equal.

[0070] The oil film pattern 310 is configured with an equal number of oil inlet holes 120, and both are even numbers. The center line of each oil inlet hole 120 and the symmetry line of the corresponding oil film pattern 310 have equal included angles with the center line of the squeeze film damper.

[0071] The oil inlet holes 120 and the oil film patterns 310 have the same number to achieve stable oil supply. The oil inlet holes 120 and the oil film patterns 310 should be even numbers, and the center line of each oil inlet hole 120 and the symmetry line of the corresponding oil film pattern 310 should have equal included angles with the center line of the squeeze film damper, that is, α1 and α2 are equal.

[0072] The numbers of the oil film patterns 310 and the oil inlet holes 120 can increase in even numbers according to the vibration reduction target. For example: 4 oil film patterns 310 and 4 oil inlet holes 120, and the included angle between the center line of each oil inlet hole 120 and the symmetry line of the corresponding oil film pattern 310 and the center line of the squeeze film damper is 90°; 8 oil film patterns 310 and 8 oil inlet holes 120, and the included angle between the center line of each oil inlet hole 120 and the symmetry line of the corresponding oil film pattern 310 and the center line of the squeeze film damper is 45°; 12 oil film patterns 310 and 12 oil inlet holes 120, and the included angle between the center line of each oil inlet hole 120 and the symmetry line of the corresponding oil film pattern 310 and the center line of the squeeze film damper is 30°, and so on.

[0073] As Figures 1 to 3As shown in the figure, as a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present utility model, the cross-sectional area of the squeeze film region 400 accounts for 11% to 30% of the cross-sectional area of the entire squeeze film damper.

[0074] As a preferred embodiment of the multi-layer oil film integral squeeze film damper of the present utility model, the squeeze film damper is integrally formed by using wire electrical discharge machining technology.

[0075] Due to the simple structure of the squeeze film damper of the present utility model, advanced machining technologies such as wire electrical discharge machining can be used for integral machining.

[0076] The integral machining process weakens the machining errors during the manufacturing and installation of the squeeze film damper of the present utility model, and comprehensively improves the reliability and safety of the equipment.

[0077] Preferably, the multi-layer oil film integral squeeze film damper of the present utility model is applicable to the aero-engine rotor-bearing system.

[0078] The multi-layer oil film integral squeeze film damper of the present utility model uses wire electrical discharge machining technology to integrate the oil film pattern 310 and the elastic support. By circumferentially and evenly distributing a certain number of serrated springs, the squeeze film region 400 between the inner and outer flanges 100 is divided into multiple independent chambers, effectively solving the problem of non-linear vibration of the rotor system caused by the circumferential flow of the oil film.

[0079] The oil inlet groove 110 of the multi-layer oil film integral squeeze film damper of the present utility model is a groove, which can store a certain amount of oil body to avoid instantaneous oil shortage around the oil inlet hole 120. The external oil supply pipeline supplies oil to the closed area formed by the oil inlet groove and the outer housing, and the oil body fills the entire oil film pattern 310 and the squeeze film region 400 through the oil inlet hole 120.

[0080] When the rotor vibrates, the inner flange 200 of the squeeze film damper generates eccentricity, driving the oil body to flow in the oil film pattern 310. The squeeze film effect of each squeeze film region 400 and the orifice flow-limiting effect of the lubricating oil inlet and outlet provide damping for the system. At the same time, the outer flange 100 seals to prevent leakage of the oil film fluid, so that the optimal damping required by the rotor system can be obtained by adjusting the oil supply pressure of the oil inlet, significantly reducing the system vibration.

[0081] In engineering applications, the damping and vibration reduction goal can be achieved by adjusting the number of the oil inlet holes 120 and the oil film patterns 310 and the serrated structure of the oil film pattern 310. The more the number of the oil inlet holes 120 and the oil film patterns 310, the smaller the radial stiffness of the squeeze film damper and the better the elastic support effect; the more the number of the slits 311 of the oil film pattern 310 and the smaller the gap of the slits 311, the more significant the damping effect.

[0082] The multi-layer oil film integral squeeze film damper of the present utility model is usually used in combination with a bearing in practical applications. The stiffness of the circumferentially parallel elastic structure is generally one order of magnitude lower than that of the bearing in series with it. Therefore, the stiffness of the squeeze film damper is mainly determined by the stiffness of its elastic support. The use of the elastic support reduces the stiffness of the rotor system, effectively reduces the amplitude of the rotor when passing through the critical speed, improves the working efficiency of the squeeze film damper, and significantly weakens the vibration of the rotor system. During the working process, the vibration and deformation of the rotor system will be mainly distributed on the elastic support, greatly improving the fatigue life of the rotor and the bearing.

[0083] For the multi-layer oil film integral squeeze film damper of the present utility model, the use of a partitioned squeeze film area can eliminate non-linear vibration phenomena such as jamming, bistable response, non-coordinated precession, and even chaotic motion generated by the original squeeze film damper (SFD). The present utility model integrally designs the elastic support structure and the squeeze film area, which reduces the weight of the squeeze film damper to a certain extent. The present utility model combines the squirrel-cage elastic support structure with the squeeze film damper, reducing the axial installation space of the original squeeze film damper (SFD).

[0084] In summary, the multi-layer oil film integral squeeze film damper of the present utility model has the following many beneficial effects:

[0085] First, the multi-layer oil film integral squeeze film damper of the present utility model can effectively solve the vibration problem caused by the highly non-linear oil film, with good vibration reduction effect and high safety.

[0086] Second, the multi-layer oil film integral squeeze film damper of the present utility model has multiple oil films and a wide squeeze film area, and can achieve multiple damping targets by adjusting the number and gap of the oil film slits 311 to meet the requirements of various engineering applications.

[0087] Third, the multi-layer oil film integral squeeze film damper of the present utility model integrates the elastic support and the oil film pattern 310, with a simple structure, easy to process, low weight, low cost, and convenient installation, suitable for the situation of severe space restrictions inside an aero-engine.

[0088] Although the specific implementation manners of the present utility model have been described above, those skilled in the art should understand that these are only examples. The protection scope of the present utility model is defined by the appended claims. Without departing from the principle and essence of the present utility model, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present utility model.

Claims

1. A multi-layer oil film integral squeeze film damper, characterized in that, The squeeze film damper comprises an outer flange and an inner flange, The outer flange is provided with an oil inlet groove and an oil inlet hole; The outer flange and the inner flange are connected via a plurality of supporting parts, and the plurality of supporting parts are evenly distributed along the circumference of the squeeze film damper; The support portion is provided with an oil film pattern, and the oil film pattern is in a sawtooth shape; An oil film extrusion area is arranged between the plurality of support parts.

2. The multi-layer oil film integral squeeze film damper according to claim 1, characterized in that, The oil film pattern is hollowed out on the support portion, and the zigzag oil film pattern includes slits arranged alternately on both sides of the support portion; the oil film pattern enables the support portion to form an elastic support structure.

3. The multi-layer oil film integral squeeze film damper according to claim 1, characterized in that The oil inlet groove is arranged on the entire outer circumference of the outer flange; the oil inlet groove is a strip-shaped groove, which is centrally distributed along the circumference of the outer flange.

4. The multi-layer oil film integral squeeze film damper according to claim 1, characterized in that The oil inlet hole is arranged in the oil inlet groove; the oil inlet hole is a radial oil hole, which is evenly distributed along the outer circumference of the outer flange; the oil inlet hole and the oil film texture are interconnected, and are used to supply oil to the oil film texture and the extrusion oil film area.

5. The multi-layer oil film integral squeeze film damper according to claim 1, characterized in that The squeeze oil film area is divided into chambers independent of each other by the support portion, the inner flange, and the outer flange.

6. The multi-layer oil film integral squeeze film damper according to claim 2, characterized in that, The number of slits in the oil film pattern is 5 to 23.

7. The multi-layer oil film integral squeeze film damper according to claim 2, wherein The slit gap of the oil film pattern is 0.5 to 2.5 mm.

8. The multi-layer oil film integral squeeze film damper according to claim 1, characterized in that, The number of the oil film patterns is equal to the number of the oil inlet holes, and the two are configured in a one-to-one correspondence, and the number of the oil film patterns and the number of the oil inlet holes are both even numbers.

9. The multi-layer oil film integral squeeze film damper according to claim 8, characterized in that, The center line of each oil inlet hole forms a first angle with the center line of the squeeze film damper, and the symmetry line of the oil film pattern corresponding to each oil inlet hole forms a second angle with the center line of the squeeze film damper, and the first angle is equal to the second angle.

10. The multi-layer oil film integral squeeze film damper according to claim 1, characterized in that, The cross-sectional area of ​​the squeeze film zone accounts for 11% to 30% of the cross-sectional area of ​​the entire squeeze film damper.

11. The multi-layer oil film integral squeeze film damper according to any one of claims 1-10, characterized in that, The squeeze film damper is integrally formed by adopting the electric spark wire cutting processing technology.

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