An oil film damper

Abstract

The application discloses an oil film damper, which comprises a base, a damper body and a flow control structure; the damper body is fixedly arranged on the base; the damper body comprises a damper inner ring and a damper outer ring; the inner wall of the damper inner ring is adapted to be connected with the outer wall of a bearing; the damper outer ring is coaxially arranged with the damper inner ring and encloses an oil film cavity adapted to contain lubricating oil; the flow control structure is arranged in the oil film cavity and arranged on the damper inner ring or the damper outer ring; the flow control structure comprises an elastic connecting piece and a flow control piece; one end of the elastic connecting piece is connected with the flow control piece, and the other end is connected with the damper inner ring or the damper outer ring; the flow control piece can float in the oil film cavity under the action of the elastic connecting piece to disturb the flow state of the lubricating oil, so as to increase the damping of the lubricating oil and inhibit the vibration of the damper. The structure has better damping effect, and the nonlinear effect of the whole oil film damper is weakened, and the use and application range of the extrusion oil film damper are increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of damper, in particular to an oil film damper. BACKGROUND

[0002] The vibration of an aero-engine, as a high-speed rotor system, is extremely important. For an aero-engine, as the rotational speed of a rotating shaft increases, the rotational speed of a rotor increases, the centrifugal force acting on the rotor increases, and the eccentricity of the rotor increases. Therefore, the aero-engine is more likely to vibrate than other devices. The centrifugal force is also likely to cause the rotor to break. According to statistics, more than 90% of the structural strength failures of an aero-engine are caused by or related to vibration. The vibration and stability of a rotor-support system are often the crux of the problem. Therefore, it is necessary to analyze the vibration reduction mechanism of an aero-engine to improve the vibration of the rotor of the aero-engine.

[0003] Although the squeeze oil film damper has obvious vibration reduction effect, the nonlinearity of the oil film force is large, which may cause many harmful nonlinear responses, such as uncoordinated precession of the rotor, bistable jump, and lock of the critical rotational speed, and further cause excessive vibration of the rotor system and even rubbing, fatigue, and other failures, thereby limiting the use and application range of the squeeze oil film damper. SUMMARY

[0004] Therefore, the present application aims to solve the problem that although the squeeze oil film damper has obvious vibration reduction effect, the nonlinearity of the oil film force is large, which may cause many harmful nonlinear responses, such as uncoordinated precession of the rotor, bistable jump, and lock of the critical rotational speed, and further cause excessive vibration of the rotor system and even rubbing, fatigue, and other failures, thereby limiting the use and application range of the squeeze oil film damper.

[0005] To this end, the present application provides an oil film damper, comprising:

[0006] a base;

[0007] a damper body fixedly arranged on the base, the damper body comprising a damper inner ring and a damper outer ring, an inner wall of the damper inner ring being adapted to be connected to an outer wall of a bearing; the damper outer ring is coaxially arranged with the damper inner ring and encloses an oil film cavity adapted to accommodate lubricating oil;

[0008] a flow control structure located in the oil film cavity, the flow control structure being arranged on the damper inner ring or the damper outer ring;

[0009] The flow control structure comprises elastic connecting members and flow control members, one end of the elastic connecting members is connected with the flow control members, and the other end is connected with the inner ring of the damper or the outer ring of the damper; when the bearing drives the inner ring of the damper to deviate in the oil film cavity, the flow control members can float in the oil film cavity under the action of the elastic connecting members to disturb the flow state of the lubricating oil, thereby increasing the damping of the lubricating oil to suppress the vibration of the damper.

[0010] Optionally, the flow control structure is arranged on the inner ring of the damper, and a plurality of groups of the flow control structure are arranged on the outer wall of the inner ring of the damper along the circumferential direction of the inner ring of the damper.

[0011] Optionally, each group of the flow control structure comprises one flow control member and a plurality of elastic connecting members, and the plurality of elastic connecting members are arranged between the flow control member and the outer ring of the damper along the axial direction of the bearing.

[0012] Optionally, the flow control member further comprises:

[0013] a flow control part in a plate structure;

[0014] a connecting part, one end of the connecting part is connected with the flow control part, and the other end of the connecting part is connected with the elastic connecting member;

[0015] wherein the outer diameter of the flow control part is greater than the outer diameter of the connecting part.

[0016] Optionally, the flow control part comprises a first flow control surface and a second flow control surface, the first flow control surface is arranged on one side of the flow control part close to the outer ring of the damper, and the second flow control surface is arranged on one side of the flow control part close to the inner ring of the damper.

[0017] wherein the first flow control surface and the second flow control surface are both arranged as arc surfaces.

[0018] Optionally, the radius of the first flow control surface and the second flow control surface is 5°-7°.

[0019] Optionally, the flow control member further comprises a flow control hole, the flow control hole is arranged at the connection position of the connecting part and the flow control part, and the extension direction of the flow control hole is along the tangent direction at the intersection of the circumferential direction of the inner ring of the damper and the extension line of the axis of the flow control structure.

[0020] Optionally, a plurality of flow control holes are arranged on the flow control member, and the plurality of flow control holes are arranged on the connecting part along the axial direction of the inner ring of the damper.

[0021] Optionally, the outer wall of the inner ring of the damper is provided with a mounting groove corresponding to the flow control structure, one end of the elastic connecting member is fixed on the bottom wall of the mounting groove, and the other end is connected with the connecting part.

[0022] The inner periphery shape of the mounting groove is matched with the outer periphery shape of the connecting part, and under the elastic force of the elastic connecting member, the connecting part can be telescopically moved in the oil film cavity along the mounting groove.

[0023] Optionally, a sealing structure is arranged between the connecting part and the mounting groove, which is used to prevent the lubricating oil from entering the inside of the mounting groove from the gap between the connecting part and the mounting groove.

[0024] The technical scheme provided by the present application has the following advantages:

[0025] 1. The embodiment provides an oil film damper, which comprises a base, a damper body and a flow control structure; wherein the damper body is fixedly arranged on the base, the damper body comprises a damper inner ring and a damper outer ring, the inner wall of the damper inner ring is adapted to be connected with the outer wall of the bearing; the damper outer ring is coaxially arranged with the damper inner ring and encloses an oil film cavity adapted to accommodate lubricating oil; the flow control structure is located in the oil film cavity, and the flow control structure is arranged on the damper inner ring or the damper outer ring; the flow control structure comprises an elastic connecting member and a flow control member, one end of the elastic connecting member is connected with the flow control member, and the other end is connected with the damper inner ring or the damper outer ring; when the bearing drives the damper inner ring to deviate in the oil film cavity, the flow control member can float in the oil film cavity under the action of the elastic connecting member to disturb the flow state of the lubricating oil, so as to increase the damping of the lubricating oil to suppress the vibration of the damper.

[0026] The structure sets the base, the damper body and the flow control structure, the damper body includes the damper inner ring and the damper outer ring, the damper outer ring and the damper inner ring are fixed on the base, the damper inner ring is specifically an annular structure, the inner wall of the damper inner ring is fixed with the bearing, the damper inner ring is an elastic support, the damper outer ring is an annular structure, and is arranged on the outer circumferential side of the damper inner ring, the outer wall of the damper inner ring and the inner wall of the damper outer ring jointly enclose an oil film cavity, the oil film cavity can accommodate the lubricating oil, the damper outer ring is provided with an oil inlet and an oil outlet, the oil inlet is used for injecting the lubricating oil into the oil film cavity, and the oil outlet is used for discharging the lubricating oil in the oil film cavity; the flow control structure is arranged in the oil film cavity, and the flow control structure is arranged on the damper inner ring or the damper outer ring, but because the vibration is finally transmitted to the damper inner ring through the bearing from the rotor, the flow control structure is preferably arranged on the damper inner ring, the flow control body includes an elastic connecting piece and a flow control piece, the elastic connecting piece can be specifically a spring, one end of the elastic connecting piece is fixed on the flow control structure, and the other end is fixed on the damper inner ring or the damper outer ring; when the rotor transmits the vibration to the damper inner ring through the bearing, the damper inner ring will be deflected in the oil film cavity, in the process of deflection, the lubricating oil in the oil film cavity will flow, for example, when the damper inner ring is deflected to the left in the oil film cavity, the lubricating oil in the oil film cavity will flow to the right along the upper and lower side walls of the damper inner ring; in the above flow process, the lubricating oil will impact the flow control structure, so that the flow control structure will float in the oil film under the action of the elastic connecting piece, thereby disturbing the flow state of the lubricating oil, compared with the prior art, the present application not only utilizes the viscous damping of the oil film to convert the kinetic energy of the oil film damper system into the internal energy of the oil film for vibration reduction, but also changes the flow state of the lubricating oil from laminar flow to turbulent flow by arranging the flow control structure, increases the viscous friction of the lubricating oil, increases the energy loss during flow to dissipate the vibration energy, the damping effect is better, and the control effect of the oil film extrusion flow is strengthened, the nonlinear effect of the entire oil film damper is weakened, the situations such as non-coordinated precession of the rotor, double-stable state jumping and over critical speed "locking" are avoided, the rotor system vibration is prevented from being too large, and even the collision, fatigue and other faults are avoided, thereby increasing the use and application range of the extrusion oil film damper. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 It is an internal sectional view of the oil film damper provided in the present application;

[0029] Figure 2 Structure diagram of flow control structure provided in the present application;

[0030] Explanation of reference signs:

[0031] 1 - inner ring of damper; 11 - mounting groove;

[0032] 2 - outer ring of damper;

[0033] 3 - oil film cavity;

[0034] 4 - flow control structure; 41 - elastic connecting piece; 42 - flow control piece; 421 - flow control part; 4211 - first flow control surface; 4212 - second flow control surface; 422 - connecting part; 423 - flow control hole. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0039] Embodiment 1

[0040] This embodiment provides an oil film damper, such asFigure 1 and Figure 2 As shown in the figure, the base, the damper body and the flow control structure 4; wherein the damper body is fixedly arranged on the base, the damper body comprises a damper inner ring 1 and a damper outer ring 2, the inner wall of the damper inner ring 1 is adapted to be connected with the outer wall of the bearing; the damper outer ring 2 is coaxially arranged with the damper inner ring 1 and encloses an oil film cavity 3 adapted to accommodate the lubricating oil; the flow control structure 4 is located in the oil film cavity 3, the flow control structure 4 is arranged on the damper inner ring 1 or the damper outer ring 2; the flow control structure 4 comprises an elastic connecting piece 41 and a flow control piece 42, one end of the elastic connecting piece 41 is connected with the flow control piece 42, and the other end is connected with the damper inner ring 1 or the damper outer ring 2; when the bearing drives the damper inner ring 1 to deviate in the oil film cavity 3, the flow control piece 42 can float in the oil film cavity 3 under the action of the elastic connecting piece 41 to disturb the flow state of the lubricating oil, thereby increasing the damping of the lubricating oil to suppress the vibration of the damper.

[0041] The structure is characterized in that the base, the damper body and the flow control structure 4 are arranged, the damper body comprises a damper inner ring 1 and a damper outer ring 2, the damper outer ring 2 and the damper inner ring 1 are fixed on the base, the damper inner ring 1 is in a ring structure, the inner wall of the damper inner ring 1 is fixedly arranged with the bearing, the damper inner ring 1 is an elastic support, the damper outer ring 2 is in a ring structure and is arranged on the outer circumferential side of the damper inner ring 1, the outer wall of the damper inner ring 1 and the inner wall of the damper outer ring 2 jointly enclose an oil film cavity 3, the oil film cavity 3 can contain lubricating oil, the damper outer ring 2 is provided with an oil inlet and an oil outlet, the oil inlet is used for injecting lubricating oil into the oil film cavity 3, and the oil outlet is used for discharging the lubricating oil in the oil film cavity 3; the flow control structure 4 is arranged in the oil film cavity 3 and is arranged on the damper inner ring 1 or the damper outer ring 2, but because the vibration is transmitted to the damper inner ring 1 through the bearing, the flow control structure 4 is preferably arranged on the damper inner ring 1, the flow control body comprises an elastic connecting piece 41 and a flow control piece 42, the elastic connecting piece 41 can be a spring in particular, one end of the elastic connecting piece 41 is fixed on the flow control structure 4, and the other end is fixed on the damper inner ring 1 or the damper outer ring 2; when the rotor transmits the vibration to the damper inner ring 1 through the bearing, the damper inner ring 1 deflects in the oil film cavity 3, and the lubricating oil in the oil film cavity 3 flows in the process of deflection, for example, when the damper inner ring 1 deflects to the left in the oil film cavity 3, the lubricating oil in the oil film cavity 3 flows to the right along the upper and lower side walls of the damper inner ring 1; in the above flow process, the lubricating oil impacts the flow control structure 4, so that the flow control structure 4 floats in the oil film under the action of the elastic connecting piece 41, thereby disturbing the flow state of the lubricating oil. Compared with the prior art, the present application not only utilizes the viscous damping of the oil film to convert the kinetic energy of the oil film damper system into the internal energy of the oil film for vibration reduction, but also changes the flow state of the lubricating oil from laminar flow to turbulent flow by arranging the flow control structure 4, increases the viscous friction of the lubricating oil, increases the energy loss during flow, thereby dissipates the energy of vibration, the damping effect is better, and the control effect of the oil film extrusion flow is strengthened, the nonlinear effect of the whole oil film damper is weakened, the situations such as non-coordinated precession of the rotor, double-stable state jumping and over-critical speed “locking” are avoided, the vibration of the rotor system is prevented from being too large or even from colliding and rubbing, fatigue and other faults, thereby the use and application range of the extrusion oil film damper is increased.

[0042] In the embodiment, the flow control structure 4 is arranged on the damper inner ring 1, the flow control structure 4 is arranged in several groups, and the several groups of flow control structures 4 are arranged on the outer wall of the damper inner ring 1 along the circumferential direction of the damper inner ring 1. Each group of flow control structures 4 comprises one flow control piece 42 and a plurality of elastic connecting pieces 41, and the plurality of elastic connecting pieces 41 are arranged between the flow control piece 42 and the damper outer ring 2 along the axial direction of the bearing.

[0043] The flow control structure 4 in the structure is arranged on the outer wall of the damper inner ring 1, and the flow control structure 4 is arranged in several groups. The array direction of the several groups of flow control structures 4 is arranged along the circumferential direction of the damper inner ring 1, so that the flow control structures 4 on the damper inner ring 1 are uniformly arranged, and the flow control structures 4 can work no matter the damper inner ring 1 is in the oil film cavity 3. Each group of flow control structures 4 includes one flow control piece 42 and a plurality of elastic connecting pieces 41. The extension direction of the flow control piece 42 is along the axis direction of the damper inner ring 1. The plurality of elastic connecting pieces 41 are arranged between the corresponding flow control piece 42 and the damper inner ring 1, and the arrangement direction of the plurality of elastic connecting pieces 41 is along the axis direction of the damper inner ring 1. The stiffness of the damper is related to the parameters of the oil and the parameters of the extrusion movement. The movement of the oil film affects the parameters of the extrusion movement. The flow control structure 4 disturbs the flow of the oil film, thereby affecting the mode of the extrusion flow, changing the boundary conditions of the oil film, and increasing the stiffness of the entire damper. By changing the number of elastic connecting pieces 41 and the number of circumferentially distributed flow control structures 4, the stiffness of the damper can be adjusted, thereby adjusting the critical speed of the damper, reducing the peak size of the vibration, reducing the nonlinear dynamic characteristics of the oil film, and increasing the application range of the extrusion oil film damper. The number of springs and the number of bosses are adjusted according to different rotor working conditions and needs. At the same time, when the rotor is doing precession, the oil film reaction force acts on the top of the flow control structure 4 to compress the flow control structure 4 in the deflection direction of the damper inner ring 1, and stretch the flow control structure 4 in the deflection direction away from the damper inner ring 1. The compression and stretching of the elastic connecting piece 41 store the energy of the vibration and slowly release it. Through the above various ways to increase the oil film reaction force, the oil film damping of the shaft journal precession can provide greater oil film damping to suppress the vibration of the rotor and improve the working efficiency of the damper.

[0044] In the embodiment, as shown in Figure 1 and Figure 2 The flow control piece 42 further includes a flow control part 421 and a connecting part 422. The flow control part 421 is in a plate structure. One end of the connecting part 422 is connected to the flow control part 421, and the other end of the connecting part 422 is connected to the elastic connecting piece 41. The outer diameter of the flow control part 421 is greater than the outer diameter of the connecting part 422. The flow control part 421 includes a first flow control surface 4211 and a second flow control surface 4212. The first flow control surface 4211 is arranged on the side of the flow control part 421 close to the damper outer ring 2, and the second flow control surface 4212 is arranged on the side of the flow control part 421 close to the damper inner ring 1. Both the first flow control surface 4211 and the second flow control surface 4212 are arranged as arc surfaces. The curvature of the first flow control surface 4211 and the second flow control surface 4212 is 5°-7°.

[0045] The flow control member 42 in the structure comprises a flow control part 421 and a connecting part 422. The outer diameter of the flow control part 421 is larger than that of the connecting part 422, that is, the planar width of the flow control part 421 is larger than that of the connecting part 422. The flow control part 421 is in a plate-like structure, and is arc-shaped. The connecting part 422 is in a rectangular block structure. The extension direction of the flow control part 421 is also the axial direction of the inner ring 1 of the damper. The flow control part 421 is connected with the connecting part 422, and is protrudingly arranged away from the connecting part 422. One side of the flow control part 421 away from the connecting part 422 is a first flow control surface 4211, and the other side of the flow control part 421 close to the connecting part 422 is a second flow control surface 4212. Both the first flow control surface 4211 and the second flow control surface 4212 are arc surfaces. The curvature of the first flow control surface 4211 and the second flow control surface 4212 is 5°-7°. The thickness of the oil film is generally between 0.15 mm and 0.3 mm. The contact area of the first flow control surface 4211, the second flow control surface 4212 and the oil film is increased, so that the acting area of the oil film on the flow control part 421 is more extensive, the flow control effect of the flow control structure 4 is enhanced, and the rotor is further damped. In addition, the arc surface has the effect of uniform force, so that the stress of the flow control part 421 is more uniform, and the damping movement is more stable. In addition, the first flow control surface 4211 increases the radial force when contacting with the outer ring 2 of the damper, increases the friction resistance of the lubricating oil, converts the vibration energy into the internal energy of the lubricating oil, and thus suppresses the vibration of the rotor.

[0046] In the embodiment, as shown in Figure 1 and Figure 2 , the flow control member 42 further comprises a flow control hole 423. The flow control hole 423 is arranged at the connecting position of the connecting part 422 and the flow control part 421, and the extension direction of the flow control hole 423 is the tangent direction at the intersection of the circumferential direction of the inner ring 1 of the damper and the axial line of the flow control structure 4. A plurality of flow control holes 423 are arranged on the flow control member 42. The plurality of flow control holes 423 are arranged on the connecting part 422 in the axial direction of the inner ring 1 of the damper.

[0047] The flow control hole 423 is arranged on the flow control member 42 in the structure, and is arranged at the connecting position of the connecting part 422 and the flow control part 421, that is, at the upper end of the connecting part 422. The extending direction of the flow control hole 423 is the tangent direction at the intersection of the circumferential direction of the inner ring 1 of the damper and the extending line of the axis of the flow control structure 4. For example, the uppermost flow control structure 4, the intersection of the circumferential direction of the inner ring 1 of the damper and the extending line of the axis of the flow control structure 4 is the top end of the uppermost flow control structure 4, and the tangent direction at this point is the horizontal direction. Therefore, the flow control hole 423 is arranged in the horizontal direction. The flow control hole 423 is arranged in a plurality of ways, and the arrangement direction of the flow control hole 423 is the axial direction of the inner ring 1 of the damper. The oil flows through the flow control hole 423. Since the mass flow rate is constant, the sudden decrease in the flow area of the oil causes a large change in the velocity gradient of the oil, disturbs the flow state of the oil, changes the laminar flow into turbulent flow, increases the viscous friction of the oil, increases the energy loss during flow, and dissipates the vibration energy.

[0048] In other implementable ways, by reasonably configuring the diameter of the flow control hole 423 and the arc of the first flow control surface 4211 and the second flow control surface 4212 in the flow control part 421, the damping of the oil film can be increased, and the working efficiency of the damper can be improved. By changing the number of the elastic connecting members 41 and the flow control members 42, the stiffness of the system can be adjusted, the nonlinear dynamic characteristics of the oil film can be reduced, the damper can be prevented from staying near the critical speed during operation, and the stability of the system can be improved.

[0049] In the embodiment, as shown in Figure 1 and Figure 2 , the outer wall of the inner ring 1 of the damper is provided with a mounting groove 11 corresponding to the flow control structure 4. One end of the elastic connecting member 41 is fixed to the bottom wall of the mounting groove 11, and the other end is connected to the connecting part 422. The inner periphery shape of the mounting groove 11 is matched with the outer periphery shape of the connecting part 422. Under the elastic force of the elastic connecting member 41, the connecting part 422 can move in and out in the oil film cavity 3 along the mounting groove 11.

[0050] The outer wall of the damper inner ring 1 in the structure is provided with a mounting groove 11, the mounting groove 11 is arranged corresponding to the flow control part 421 in the flow control structure 4, and the shape and size of the mounting groove 11 are matched with the flow control part 421, that is, the inner peripheral shape of the mounting groove 11 is matched with the outer peripheral shape of the connecting part 422, one end of the elastic connecting piece 41 is fixed on the bottom wall of the mounting groove 11, and the other end is fixed on the end of the connecting part 422 away from the flow control part 421. In the process of the rotor being driven by the bearing to vibrate and deflect in the oil film cavity 3, the elastic connecting piece 41 will drive the connecting part 422 to slide along the side wall of the mounting groove 11, which plays a guiding role for the entire flow control structure 4, preventing the deflection of the flow control structure 4 from affecting the entire system. Moreover, the elastic connecting piece 41 installed in the mounting groove 11 does not occupy the extrusion space of the oil film, and does not hinder the rotation of the rotor to cause structural damage. At the same time, the flow control piece 42 and the elastic connecting piece 41 are not integral, which is convenient to disassemble, easy to install and maintain.

[0051] In other implementable ways, in order not to occupy more space, the depth of the mounting groove 11 is about 0.3mm, and the thickness of the flow control structure 4 should ensure that the first flow control surface 4211 can contact the outer ring, and at the same time the bottom of the boss is still in the groove, and the diameter of the bottom circular hole is about 0.1mm; the thickness of the connecting part 422 is about 0.25mm, and the thickness of the flow control surface is 1 / 3 to 1 / 2 of the thickness of the oil film cavity 3.

[0052] In the embodiment, as shown in Figure 1 and Figure 2 A sealing structure is arranged between the connecting part 422 and the mounting groove 11, which is used to prevent the lubricating oil from entering the inside of the mounting groove 11 from the gap between the mounting groove 11 and the connecting part 422.

[0053] In the structure, a sealing structure is arranged between the connecting part 422 and the mounting groove 11, which can be a sealing ring and can be arranged in the mounting groove 11 or at the opening of the mounting groove 11, so as to prevent the lubricating oil from entering the inside of the mounting groove 11 from the gap between the mounting groove 11 and the connecting part 422, thereby affecting the movement of the flow control structure 4 and affecting the damping function of the entire system.

[0054] Obviously, the above embodiments are only examples for clear illustration, and are not limitations on the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations still fall within the protection scope of the present application.

Claims

1. An oil film damper characterized by, The application relates to a damper, which comprises a base, a damper body fixedly arranged on the base, the damper body comprising a damper inner ring (1) and a damper outer ring (2), the inner wall of the damper inner ring (1) being adapted to be connected with the outer wall of a bearing, the damper outer ring (2) being coaxially arranged with the damper inner ring (1) and enclosing an oil film cavity (3) adapted to contain lubricating oil, a flow control structure (4) being arranged in the oil film cavity (3), the flow control structure (4) being arranged on the damper inner ring (1) or the damper outer ring (2), wherein the flow control structure (4) comprises elastic connecting members (41) and a flow control member (42), one end of the elastic connecting members (41) being connected with the flow control member (42), the other end being connected with the damper inner ring (1) or the damper outer ring (2), when the bearing drives the damper inner ring (1) to deviate in the oil film cavity (3), the flow control member (42) can float in the oil film cavity (3) under the action of the elastic connecting members (41) to disturb the flow state of the lubricating oil, thereby increasing the damping of the lubricating oil to suppress the vibration of the damper, the flow control structure (4) is arranged on the damper inner ring (1), the flow control structure (4) is arranged in several groups, and the several groups of the flow control structure (4) are arranged on the outer wall of the damper inner ring (1) along the circumferential direction of the damper inner ring (1), each group of the flow control structure (4) comprises one flow control member (42) and a plurality of elastic connecting members (41), and the plurality of elastic connecting members (41) are arranged between the flow control member (42) and the damper outer ring (2) along the axial direction of the bearing, the flow control member (42) further comprises a flow control part (421) in a plate structure, a connecting part (422) having one end connected with the flow control part (421) and the other end connected with the elastic connecting members (41), wherein the outer diameter of the flow control part (421) is larger than the outer diameter of the connecting part (422), the outer wall of the damper inner ring (1) is provided with mounting grooves (11) corresponding to the flow control structure (4), one end of the elastic connecting members (41) is fixed on the bottom wall of the mounting grooves (11), and the other end is connected with the connecting part (422), the inner circumferential shape of the mounting grooves (11) is matched with the outer circumferential shape of the connecting part (422), and under the elastic force of the elastic connecting members (41), the connecting part (422) can be telescopically moved in the oil film cavity (3) along the mounting grooves (11), and the flow control member (42) further comprises a flow control hole (423) arranged at the connecting position of the connecting part (422) and the flow control part (421), and the extension direction of the flow control hole (423) is the tangent direction of the intersection point of the circumferential direction of the damper inner ring (1) and the axial extension line of the flow control structure (4). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Corresponding to the flow control piece (42), a plurality of flow control holes (423) are arranged on the connecting part (422) along the axial direction of the damper inner ring (1).

2. The oil film damper of claim 1, wherein The flow control part (421) comprises a first flow control surface (4211) and a second flow control surface (4212), the first flow control surface (4211) is arranged on the side of the flow control part (421) close to the damper outer ring (2), and the second flow control surface (4212) is arranged on the side of the flow control part (421) close to the damper inner ring (1). The first flow control surface (4211) and the second flow control surface (4212) are both arranged as arc surfaces.

3. The oil film damper of claim 2, wherein The curvature of the first flow control surface (4211) and the second flow control surface (4212) is 5°-7°.

4. The oil film damper of claim 3, wherein A sealing structure is arranged between the connecting part (422) and the mounting groove (11), and the sealing structure is used to prevent the lubricating oil from entering the inside of the mounting groove (11) from the cooperation gap between the mounting groove (11) and the connecting part (422).

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