An oil film damper vibration damping structure

Abstract

The application discloses an oil film damper damping structure, which comprises a bearing, a support seat and an adjusting structure, wherein the bearing comprises a bearing outer ring and a bearing inner ring, the bearing inner ring is suitable for being connected with a rotor; the inner ring of the support seat is coaxially arranged with the bearing outer ring to enclose an oil film cavity suitable for containing lubricating oil; the adjusting structure is fixedly arranged in the oil film cavity, and the adjusting structure is fixed on the bearing outer ring or the inner ring of the support seat; the adjusting structure comprises a flow control part, the flow control part comprises a streamlined surface and a flow resistance plane which are connected with each other, and the streamlined surface and the flow resistance plane are used for controlling the flow speed of the lubricating oil; the friction coefficient of the flow resistance plane is greater than that of the streamlined surface. The structure plays a damping role under the action of the friction resistance and the pressure difference resistance of the lubricating oil on the adjusting structure, the control effect of the oil film extrusion flow is strengthened, and the use and application range of the extrusion oil film damper are increased.

Description

Technical Field

[0001] This invention relates to the field of damper technology, and more specifically to an oil film damper vibration reduction structure. Background Technology

[0002] As a high-speed rotor system, the vibration of aero-engines is extremely important. In aero-engines, the increased shaft speed leads to increased rotor speed, resulting in greater centrifugal force and rotor eccentricity, making them more prone to vibration compared to other equipment. The enormous centrifugal force can also easily cause rotor fracture and failure. Statistics show that over 90% of structural strength failures in aero-engines are caused by or related to vibration. The vibration and stability of the rotor-support system are often the crux of the problem. Therefore, analyzing the vibration reduction mechanism of aero-engines is essential for improving rotor vibration issues.

[0003] To reduce rotor vibration, a squeeze film damper was designed. In the squeeze film damper, the outer ring of the rolling bearing and the bearing housing have a suitable clearance fit. A sleeve is interference-fitted onto the outer ring of the rolling bearing to serve as the inner ring of the squeeze film damper. The rotation of this inner ring is restricted by pins or squirrel-cage elastic supports. The clearance is filled with lubricating oil, and the journal whirls and squeezes the lubricating oil between the inner and outer rings. Through the viscous damping of the lubricating oil, kinetic energy is converted into internal energy, thereby reducing rotor vibration.

[0004] Although extrusion film dampers have a significant vibration reduction effect, the nonlinearity of the oil film force is very large, which can lead to many harmful nonlinear responses, such as uncoordinated precession of the rotor, bistable jump, and "lock-up" before reaching the critical speed. This can cause excessive vibration of the rotor system and even failures such as rubbing and fatigue, thus limiting the use and application range of extrusion film dampers. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that although the extrusion oil film damper has obvious vibration reduction effect, the nonlinearity of the oil film force is very large, which will lead to many harmful nonlinear responses, such as non-coordinated precession of the rotor, bistable jump and "locking" before passing the critical speed, which will cause excessive vibration of the rotor system or even failures such as rubbing and fatigue, thus limiting the use and application scope of the extrusion oil film damper.

[0006] Therefore, the present invention provides an oil film damper vibration reduction structure, comprising:

[0007] A bearing, comprising an outer ring and an inner ring, the inner ring being adapted to be connected to a rotor;

[0008] A support base, wherein the inner ring of the support base is coaxially arranged with the outer ring of the bearing to form an oil film cavity suitable for accommodating lubricating oil;

[0009] An adjustment structure is fixedly disposed within the oil film cavity and is also fixed to the outer ring of the bearing or the inner ring of the support seat.

[0010] The regulating structure includes a flow control section, which comprises a streamlined surface and a flow-blocking plane connected to each other. The streamlined surface and the flow-blocking plane are used to control the flow velocity of the lubricating oil. The friction coefficient of the flow-blocking plane is greater than that of the streamlined surface. The streamlined surface is disposed on one side of the regulating structure to guide the lubricating oil to pass through quickly, and the flow-blocking plane is disposed on the other side of the regulating structure to slow down the flow velocity of the lubricating oil. The pressure difference resistance between the streamlined surface and the flow-blocking plane is used to balance the vibration of the rotor.

[0011] Optionally, the aforementioned adjustment structure is disposed on the outer ring of the bearing, the streamlined surface is disposed on the side facing the rotor rotation direction to guide the lubricating oil to pass through quickly, and the flow-blocking plane is disposed on the side opposite to the rotor rotation direction to slow down the flow speed of the lubricating oil.

[0012] Optionally, the above-described adjustment structure further includes a recess, which is disposed on the flow-blocking plane and is used to disrupt the flow of lubricating oil to form turbulence on the flow-blocking plane side;

[0013] The recessed portion is provided in a plurality of irregularly distributed on the flow-blocking plane, and the size of the recessed portion is different, or the depth of the recessed portion is different, or both the size and depth of the recessed portion are different.

[0014] Optionally, the streamlined surface described above is configured as a smooth arc surface, and there is an arc transition between the flow-blocking plane and the streamlined surface.

[0015] Optionally, the above-mentioned adjustment structure is provided in a plurality of units, which are arranged in a circumferential array along the bearing, and two connected adjustment structures are arranged closely together.

[0016] Optionally, the adjustment structure described above further includes a mounting portion, which is disposed on the side of the adjustment structure near the bearing;

[0017] The outer ring of the bearing is also provided with a mounting groove corresponding to the mounting part, and the mounting part is engaged in the mounting groove to limit the adjustment structure.

[0018] Optionally, the mounting part described above is configured as a trapezoidal boss, and the mounting groove corresponding to the mounting part is configured as a trapezoidal slot. The mounting part is engaged in the mounting groove to limit and fix the adjusting structure in the circumferential direction of the bearing.

[0019] Optionally, the oil film damper vibration reduction structure described above further includes a limiting element;

[0020] The bottom surface of the mounting groove is also provided with a limiting groove corresponding to the limiting member. The limiting member is installed in the limiting groove and is used to fix the adjusting structure axially.

[0021] Optionally, the aforementioned limiting member includes: a first limiting part and a second limiting part, wherein the second limiting part is disposed on both sides of the first limiting part along the axial direction of the bearing;

[0022] The limiting groove includes a first limiting groove and a second limiting groove. The second limiting groove is disposed on both sides of the first limiting groove along the axial direction of the bearing. The first limiting groove is disposed corresponding to the first limiting part, and the second limiting groove is disposed corresponding to the second limiting part.

[0023] Wherein, the outer diameter of the first limiting part is larger than the outer diameter of the second limiting part, and the outer diameter of the first limiting groove is larger than the outer diameter of the second limiting part, so that when the first limiting part is engaged in the first limiting groove and the second limiting part is engaged in the second limiting groove, the limiting groove can axially fix the limiting member.

[0024] Optionally, the end of the second limiting part away from the first limiting part is bent toward the support seat, and the bent position of the end of the second limiting part away from the first limiting part abuts against both sides of the adjusting structure to limit and fix the adjusting structure in the axial direction of the bearing.

[0025] The technical solution provided by this invention has the following advantages:

[0026] 1. This embodiment provides an oil film damper vibration reduction structure, including: a bearing, a support base, and an adjustment structure. The bearing includes an outer ring and an inner ring, the inner ring being adapted to connect to a rotor. The inner ring of the support base is coaxially arranged with the outer ring of the bearing to form an oil film cavity suitable for accommodating lubricating oil. The adjustment structure is fixedly disposed within the oil film cavity and is fixed to either the outer ring of the bearing or the inner ring of the support base. The adjustment structure includes a flow control section, comprising a streamlined surface and a flow-blocking plane connected to each other. The streamlined surface and the flow-blocking plane are used to control the flow velocity of the lubricating oil. The friction coefficient of the flow-blocking plane is greater than that of the streamlined surface. The streamlined surface is disposed on one side of the adjustment structure to guide the lubricating oil through quickly, and the flow-blocking plane is disposed on the other side of the adjustment structure to slow down the flow velocity of the lubricating oil, thereby utilizing the pressure difference resistance between the streamlined surface and the flow-blocking plane to balance the vibration of the rotor.

[0027] This structure comprises a bearing, a support seat, and an adjusting mechanism. The inner ring of the bearing is connected to the rotor, and the outer ring of the bearing is fitted with the support seat. The inner ring of the support seat is coaxial with the outer ring of the bearing, and a gap exists between them, forming an oil film cavity. Lubricating oil is placed in the oil film cavity, filling it completely to form an oil film. The adjusting mechanism is a protrusion-shaped component, fixed to either the outer ring of the bearing or the inner ring of the support seat to achieve vibration damping. The main body of the adjusting mechanism is located within the oil film cavity, specifically the flow control section. One side of the flow control section has a streamlined surface, and the other side has a flow-blocking plane, which are interconnected. During operation, under the unbalanced force of the rotor, the outer ring of the bearing is driven to compress the oil film. The movement of the outer ring is hindered by the oil film, and the lubricating oil absorbs the energy of the outer ring's movement, thus absorbing most of the vibration energy. This application reduces the vibration of the transmission casing. Furthermore, by setting an adjustment structure, the adjustment structure slides within the oil film cavity during bearing deflection, forming an eccentric state, thereby squeezing the lubricating oil. For example, when the bearing slides to the left, the lubricating oil located on the left side of the bearing in the oil film cavity will move to the right side. Consequently, the lubricating oil will impact the adjustment structure at each adjustment point. During this impact, the frictional resistance on the obstruction plane side is greater due to the higher coefficient of friction, resulting in greater kinetic energy consumption of the lubricating oil fluid. This slows down the flow rate of the lubricating oil fluid, leading to more lubricating oil accumulation and greater pressure on the plane. Conversely, on the streamlined side, the smoother surface reduces frictional resistance, resulting in less kinetic energy consumption. The lubricating oil fluid can pass through at a faster velocity than on the obstruction plane side, thus reducing fluid accumulation and pressure on the streamlined surface. According to Bernoulli's principle, when the difference in fluid position is small, the higher the fluid velocity, the lower the pressure. Therefore, if two different surfaces are designed on either side of the structure—one a streamlined surface and the other a flow-blocking surface—a pressure difference will exist between the fluid and the structure due to the pressure difference between these two surfaces. As the amount of viscous lubricating oil increases on the flow-blocking surface side and decreases on the streamlined surface side, the pressure difference resistance of the lubricating oil on the regulating structure increases. Under the combined effect of frictional resistance and pressure difference resistance, the lubricating oil effectively reduces vibration.Therefore, compared with the prior art, this invention 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 uses the pressure difference resistance generated by the oil film on the adjustment structure when it moves to reduce vibration, resulting in better vibration reduction effect and enhanced control over the oil film extrusion flow. This reduces the nonlinear effect of the entire oil film damper and avoids situations such as uncoordinated precession of the rotor, bistable jump, and "locking" before reaching the critical speed. It also prevents excessive vibration of the rotor system and even failures such as rubbing and fatigue, thereby increasing the application and scope of the extrusion oil film damper. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the oil film damper vibration reduction structure provided in this invention.

[0030] Figure 2 This is an isometric schematic diagram of the adjustment structure provided in this invention;

[0031] Figure 3 This is a side view of the adjustment structure provided in this invention;

[0032] Figure 4 This is a schematic diagram of the flow control section in the regulating structure provided in this invention;

[0033] Figure 5 This is a front view of the flow-blocking plane provided in this invention;

[0034] Figure 6 This is a schematic diagram of the assembly of the adjustment structure, the limiting component, and the bearing outer ring provided in this invention;

[0035] Figure 7 This is a schematic diagram of the overall structure of the limiting component provided in this invention;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1 – Bearing outer ring; 11 – Mounting groove; 111 – First limiting groove; 112 – Second limiting groove;

[0038] 2 - Support base;

[0039] 3 – Oil film cavity;

[0040] 4 – Adjustment structure; 41 – Flow control section; 411 – Streamlined surface; 412 – Flow obstruction plane; 42 – Recessed section; 43 – Mounting section;

[0041] 5 - Limiting component; 51 - First limiting part; 52 - Second limiting part. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Example 1

[0047] This embodiment provides an oil film damper vibration reduction structure, such as... Figures 1 to 7As shown, the device includes: a bearing, a support 2, and an adjusting structure 4. The bearing includes an outer ring 1 and an inner ring, the inner ring being adapted to connect with the rotor. The inner ring of the support 2 is coaxially arranged with the outer ring 1 to form an oil film cavity 3 suitable for containing lubricating oil. The adjusting structure 4 is fixedly disposed within the oil film cavity 3 and is fixed to either the outer ring 1 or the inner ring of the support 2. The adjusting structure 4 includes a flow control section 41, which includes a streamlined surface 411 and a flow-blocking plane 412 connected to each other. The streamlined surface 411 and the flow-blocking plane 412 are used to control the flow velocity of the lubricating oil. The friction coefficient of the flow-blocking plane 412 is greater than that of the streamlined surface 411. The streamlined surface 411 is disposed on one side of the adjusting structure 4 to guide the lubricating oil to pass through quickly, and the flow-blocking plane 412 is disposed on the other side of the adjusting structure 4 to slow down the flow velocity of the lubricating oil. The pressure difference resistance between the streamlined surface 411 and the flow-blocking plane 412 is used to balance the vibration of the rotor.

[0048] This structure comprises a bearing, a support seat 2, and an adjusting structure 4. The inner ring of the bearing is connected to the rotor. The outer ring 1 of the bearing is fitted with the support seat 2. The inner ring of the support seat 2 is coaxially arranged with the outer ring 1 of the bearing. A gap is provided between the inner ring of the support seat 2 and the outer ring 1 of the bearing, which is the oil film cavity 3. Lubricating oil is placed in the oil film cavity 3, and the lubricating oil fills the entire oil film cavity 3 to form an oil film. The adjusting structure 4 is protruding and is fixed to the outer ring 1 of the bearing or the inner ring of the support seat 2. The inner ring of the support 2 is used to achieve vibration reduction, and the main body of the adjustment structure 4 is located in the oil film cavity 3. The part located in the oil film cavity 3 is the flow control part 41. One side of the flow control part 41 is provided with a streamlined surface 411, and the other side is a flow-blocking plane 412. The streamlined surface 411 and the flow-blocking plane 412 are connected to each other. The radius gap of the oil film cavity 3 is 0.2mm-0.3mm. The material of the adjustment structure 4 can be stainless steel, steel, etc. The specific material grade can be adjusted in practice, or it can be the same as the material of the bearing or support 2.

[0049] During the operation of the oil film damper, under the action of the unbalanced force of the rotor, the outer ring 1 of the bearing will be driven to squeeze the oil film. The movement of the outer ring 1 of the bearing will be hindered by the oil film. At the same time, the lubricating oil absorbs the energy of the movement of the outer ring 1 of the bearing, that is, absorbs most of the vibration energy and reduces the transmission of the vibration of the casing.

[0050] Furthermore, by setting the adjustment structure 4, during the bearing deflection process, the adjustment structure 4 will slide within the oil film cavity 3, forming an eccentric state, thereby squeezing the lubricating oil. For example, when the bearing slides to the left, the lubricating oil located on the left side of the bearing in the oil film cavity 3 will move to the right side of the bearing. Consequently, the lubricating oil will impact and contact the adjustment structure 4 on each adjustment structure 4. During the impact process, the frictional resistance of the flow-blocking plane 412 is relatively large due to the high coefficient of friction on one side. Therefore, the lubricating oil fluid consumes more kinetic energy at this point. The reduced flow velocity of the oil fluid leads to greater oil accumulation at this location, resulting in higher pressure exerted by the oil on the plane. Conversely, on the streamlined surface 411, the smoothness of the surface reduces frictional resistance, minimizing kinetic energy loss. The fluid flow on this streamlined surface is primarily laminar, with little or no turbulence. The oil fluid can flow at a relatively higher velocity than on the obstruction plane 412, resulting in less fluid accumulation at streamlined surface 411 and lower pressure exerted by the oil. According to Bernoulli's principle, when the difference in fluid elevation is minimal, higher flow velocity results in lower pressure. Therefore, if two distinct surfaces are designed on either side of the structure—streamlined surface 411 and obstruction plane 412—a pressure difference will exist between the fluid and the structure due to the difference in pressure exerted on these surfaces. As the amount of viscous lubricating oil on one side of the obstruction plane 412 increases, the amount of viscous lubricating oil on the streamlined surface 411 decreases, thus increasing the pressure resistance of the lubricating oil fluid on the regulating structure 4. Under the combined effect of frictional resistance and pressure resistance of the lubricating oil on the regulating structure 4, vibration reduction is achieved.

[0051] Compared with existing technologies, this invention 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 uses the pressure difference resistance generated by the adjustment structure 4 when the oil film moves to reduce vibration, resulting in better vibration reduction effect and enhanced control over the oil film extrusion flow. This reduces the nonlinear effect of the entire oil film damper and avoids situations such as uncoordinated precession of the rotor, bistable jump, and "locking" before reaching the critical speed. It also prevents excessive vibration of the rotor system and even failures such as rubbing and fatigue, thereby increasing the application and applicability of the extrusion oil film damper.

[0052] In this embodiment, as Figures 1 to 7 As shown, the adjustment structure 4 is set on the outer ring 1 of the bearing, the streamlined surface 411 is set on the side facing the rotor rotation direction to guide the lubricating oil to pass through quickly, and the flow-blocking plane 412 is set on the side facing away from the rotor rotation direction to slow down the flow speed of the lubricating oil.

[0053] In this structure, the streamlined surface 411 is located on the side facing the rotor rotation direction, and the flow-blocking plane 412 is located on the side facing away from the rotor rotation direction, for example: Figure 4 As shown, the flow-blocking plane 412 is located on the left side of the regulating structure 4, and the streamlined surface 411 is located on the regulating structure 4, and on the right side relative to the flow-blocking plane 412. The rotor rotates counterclockwise. Because the flow-blocking plane 412 is located on the side opposite to the rotor's rotation direction, when the lubricating oil flows through the protrusion structure from left to right in a clockwise direction, the flow-blocking plane 412 on the left side is rougher than the streamlined surface 411, which can change the fluid flow state, thereby increasing the frictional resistance of the lubricating oil to the regulating structure 4, and thus reducing the vibration of the rotor. The right side is a streamlined surface 411, and the frictional resistance on the lubricating oil is smaller, resulting in more lubricating oil on the left side and less on the right side, creating a pressure difference between the two sides. When the direction of the pressure difference force is opposite to the rotation direction of the shaft, the pressure difference resistance can be used to impede the rotor's rotation to reduce vibration.

[0054] When the rotor rotates clockwise, the adjusting structure 4 can adjust according to... Figure 1 The design is carried out in the opposite direction shown; at this time, the oil film flows counterclockwise relative to the rotor, thereby forming a counterclockwise pressure differential resistance to reduce the vibration caused by the clockwise rotation of the rotor shaft.

[0055] When the adjustment structure 4 is set on the inner ring of the support 2, the streamlined surface 411 is set on the side opposite to the rotor rotation direction to guide the lubricating oil to pass through quickly, and the flow-blocking plane 412 is set on the side facing the rotor rotation direction to slow down the flow speed of the lubricating oil. The working principle is the same as the principle described above.

[0056] The two settings mentioned above can be set separately or simultaneously, depending on the specific implementation situation.

[0057] In this embodiment, as Figures 1 to 7 As shown, the regulating structure 4 also includes a recess 42, which is disposed on the flow-blocking plane 412. The recess 42 is used to disrupt the flow of lubricating oil to create turbulence on the side of the flow-blocking plane 412. Several recesses 42 are provided, which are irregularly distributed on the flow-blocking plane 412. The size of the recesses 42 is different, or the depth of the recesses 42 is different, or both the size and depth of the recesses 42 are different.

[0058] The adjustment structure 4 in this structure also includes a recessed portion 42, which can be a conical hole or other recessed shape. The recessed portion 42 is set on the flow-blocking plane 412 and is opened by laser drilling. There are several recessed portions 42, which have different sizes but the same depth. Alternatively, the recessed portions 42 can have different depths but the same size, or both the size and depth of the recessed portions 42 can be different. Preferably, both the size and depth of the recessed portions 42 are different. The size refers to parameters such as the area of ​​the upper and lower circles of the conical hole structure, the depth of the conical hole, and the inclination of the side of the conical hole. The recessed portion 42 further increases the friction coefficient of the flow-blocking plane 412, and the low-lying surface can change the flow state of the fluid by increasing the surface roughness of the object, causing the fluid transition to occur earlier and the flow state of the fluid to change from laminar flow to turbulent flow, thereby increasing the frictional resistance of the low-lying surface to the incoming fluid. This facilitates the transformation of the oil film flow from laminar to turbulent, thereby increasing the viscous damping of the oil film at the obstruction plane 412, converting more of the rotor's kinetic energy into the internal energy of the compressed oil film, and thus achieving a better reduction in the vibration of the entire rotor system.

[0059] In order to better fix the adjustment structure 4 and prevent the outer ring 1 of the bearing that is in contact with the inclined surfaces on both sides of the mounting part 43 from being damaged due to excessive force, the inclination angle of the trapezoidal structure inclined surface of the mounting part 43 can be adjusted appropriately.

[0060] In this embodiment, as Figures 1 to 7 As shown, the streamlined surface 411 is set as a smooth arc surface, and the flow-blocking plane 412 and the streamlined surface 411 have an arc transition.

[0061] In this structure, the streamlined surface 411 is set as a smooth arc surface, and this arc surface is streamlined, specifically, it can be teardrop-shaped. The flow-blocking plane 412 is set as a rough plane. At the flow-blocking plane 412, due to the influence of the rough surface, the flow state of the squeezed oil film changes, resulting in an increase in the viscous resistance between the oil film and between the oil film and the flow-blocking plane 412, thus causing a large accumulation of lubricating oil at this point, and increasing the pressure of the lubricating oil on the flow-blocking plane 412. At the streamlined surface 411, because the plane is relatively smooth, the oil film experiences less viscous resistance from the streamlined surface 411, resulting in less lubricating oil accumulation and thus less pressure from the lubricating oil at this point. This creates a pressure difference, so the orientation of the protrusion structure can be designed according to the rotation direction of the rotor shaft, using the pressure difference resistance to reduce vibration.

[0062] In this embodiment, as Figures 1 to 7 As shown, there are several adjustment structures 4 arranged in an array along the circumference of the bearing, and two connected adjustment structures 4 are arranged closely together.

[0063] This structure includes several adjustment structures 4 arranged in a circumferential array along the bearing, with connected adjustment structures 4 closely spaced. This ensures that a pressure difference exists at all positions on the outer ring 1 of the bearing throughout its rotation. Therefore, regardless of the direction of irregular forces generated during rotor rotation, the pressure difference generated by the adjustment structures 4 can be used to dampen vibrations, preventing increased nonlinear response of the rotor due to the absence of pressure difference in a certain direction, which could lead to damper failure. Furthermore, if one adjustment structure 4 fails, it can be replaced individually, reducing maintenance costs.

[0064] Furthermore, several adjustment structures 4 are arranged in a circumferential array along the bearing to ensure that no matter in which direction the bearing is offset within the oil film cavity 3, the moving lubricating oil can impact the flow-blocking plane 412 on one part of the adjustment structure 4 and the streamlined surface 411 on another part of the adjustment structure 4, thereby enabling the work to operate normally.

[0065] The oil film cavity 3 of this invention does not require additional elastic rings or other complex working devices. The height of the adjustment structure 4, the length of the adjustment structure 4 in the circumferential direction, and the number of adjustment structures 4 can be freely adjusted according to the machining accuracy of the recess 42 of the adjustment structure 4, the roughness of the flow-blocking plane 412, the number of recesses 42, the thickness of the oil film, and the actual vibration reduction effect of the adjustment structure 4.

[0066] In this embodiment, as Figures 1 to 7 As shown, the adjustment structure 4 also includes a mounting part 43, which is located on the side of the adjustment structure 4 near the bearing; the outer ring 1 of the bearing is also provided with a mounting groove 11 corresponding to the mounting part 43, and the mounting part 43 is engaged in the mounting groove 11 to limit the adjustment structure 4.

[0067] The adjustment structure 4 in this structure also includes a mounting part 43, which is located on the side of the adjustment structure 4 near the bearing. The outer surface of the bearing outer ring 1 is also provided with a mounting groove 11 corresponding to the mounting part 43. The number of mounting grooves 11 is the same as the number of adjustment structures 4. The mounting part 43 is engaged in the mounting groove 11 to install the adjustment structure 4, thereby fixing the adjustment structure 4 on the bearing outer ring 1 and preventing the adjustment structure 4 from shaking or falling off, which would affect the operation of the oil film damper or even cause a malfunction.

[0068] In this embodiment, as Figures 1 to 7 As shown, the mounting part 43 is configured as a trapezoidal boss, and the mounting groove 11 is configured as a trapezoidal slot corresponding to the mounting part 43. The mounting part 43 is engaged in the mounting groove 11 to limit and fix the adjustment structure 4 in the circumferential direction of the bearing.

[0069] In this structure, the mounting part 43 is configured as a trapezoidal boss, specifically a dovetail tenon. The mounting groove 11 is configured as a dovetail-shaped recess corresponding to the trapezoidal boss. Both the mounting part 43 and the mounting groove 11 are opened along the axial direction of the bearing. By installing the mounting part 43 into the mounting groove 11, the circumferential inclined surfaces on both sides of the mounting part 43 are in contact with the mounting groove 11. The mounting groove 11 is used to limit the adjustment structure 4 in the radial direction, preventing the adjustment structure 4 from detaching from the outer ring 1 of the bearing in the radial direction under the action of centrifugal force.

[0070] In this embodiment, as Figures 1 to 7 As shown, the oil film damper vibration reduction structure also includes a limiting member 5; the bottom surface of the mounting groove 11 is provided with a limiting groove corresponding to the limiting member 5, the limiting member 5 is installed in the limiting groove, and the limiting member 5 is used to fix the adjustment structure 4 axially. The limiting member 5 includes: a first limiting part 51 and a second limiting part 52, the second limiting part 52 being disposed on both sides of the first limiting part 51 along the axial direction of the bearing; the limiting groove includes a first limiting groove 111 and a second limiting groove 112, the second limiting groove 112 being disposed on both sides of the first limiting groove 111 along the axial direction of the bearing, the first limiting groove 111 being disposed corresponding to the first limiting part 51, and the second limiting groove 112 being disposed corresponding to the second limiting part 52; wherein, the outer diameter of the first limiting part 51 is larger than the outer diameter of the second limiting part 52, and the outer diameter of the first limiting groove 111 is larger than the outer diameter of the second limiting part 52, so that when the first limiting part 51 is engaged in the first limiting groove 111 and the second limiting part 52 is engaged in the second limiting groove 112, the limiting groove can axially fix the limiting member 5.

[0071] The oil film damper vibration reduction structure in this configuration also includes a limiting member 5, which is a locking plate. The limiting plate includes a first limiting part 51 in the middle and second limiting parts 52 on both sides of the first limiting part 51. The two second limiting parts 52 are arranged opposite to each other and are arranged on both sides of the first limiting part 51 along the axial direction of the bearing. The first limiting part 51 is cylindrical in shape, and the second limiting parts 52 are elongated. The outer diameter of the first limiting part 51 is larger than the outer diameter of the second limiting part 52, that is, the width of the first limiting part 51 is larger than the width of the second limiting part 52. The bottom surface of the mounting groove 11 is also provided with a limiting groove, which includes a first limiting groove 111 and a second limiting groove 112. The shape and size of the first limiting groove 111 correspond to the first limiting part 51, and the shape and size of the second limiting groove 112 correspond to the first limiting part 51. The shape and size correspond to the second limiting part 52, and the second limiting groove 112 is also set on both sides of the first limiting groove 111 along the axial direction of the bearing. During installation, the first limiting part 51 is installed in the first limiting groove 111, and the second limiting part 52 is installed in the second limiting groove 112. When assembling the vibration damping structure, the limiting part 5 is first installed into the limiting groove, and then the limiting part 5 is pressed down with a specific tooling. The adjusting structure 4 is then pushed into the mounting groove 11. When it is pushed in halfway, the tooling is pulled out, and then the entire adjusting structure 4 is completely pushed into the mounting groove 11. The installation is completed. The limiting part 5 is used to limit the axial movement of the adjusting structure 4 to prevent the adjusting structure 4 from moving axially and to prevent the adjusting structure 4 from shaking or falling off, which would affect the operation of the oil film damper or even cause a malfunction.

[0072] In order to better install and fix the limiting component 5 and constrain the adjusting structure 4, the dimensions of each part of the limiting component 5 and the depth of the limiting groove on the outer ring 1 of the bearing can be adjusted appropriately.

[0073] In this embodiment, as Figures 1 to 7 As shown, the end of the second limiting part 52 away from the first limiting part 51 is bent toward the support base 2. The bent position of the end of the second limiting part 52 away from the first limiting part 51 abuts against both sides of the adjusting structure 4 to limit and fix the adjusting structure 4 in the axial direction of the bearing.

[0074] In this structure, the end of the second limiting part 52 away from the first limiting part 51 is bent toward the support base 2, that is, the bending direction is away from the center of the bearing. The bent position of the end of the second limiting part 52 away from the first limiting part 51 is locked on both sides of the adjusting structure 4, which limits and fixes the adjusting structure 4 in the axial direction of the bearing, preventing the adjusting structure 4 from moving in the axial direction, and preventing the adjusting structure 4 from shaking or falling off, thereby affecting the operation of the oil film damper or even causing a malfunction.

[0075] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A vibration reduction structure for an oil film damper, characterized in that, include: The bearing includes an outer ring (1) and an inner ring, the inner ring being adapted to be connected to a rotor; Support base (2), the inner ring of the support base (2) is coaxially arranged with the outer ring (1) of the bearing to form an oil film cavity (3) suitable for accommodating lubricating oil; Adjustment structure (4), the adjustment structure (4) is fixedly disposed in the oil film cavity (3), and the adjustment structure (4) is fixed on the outer ring (1) of the bearing or the inner ring of the support seat (2); The regulating structure (4) includes a flow control section (41), which includes a streamlined surface (411) and a flow-blocking plane (412) connected to each other. The streamlined surface (411) and the flow-blocking plane (412) are used to control the flow velocity of the lubricating oil. The friction coefficient of the flow-blocking plane (412) is greater than that of the streamlined surface (411). The streamlined surface (411) is disposed on one side of the regulating structure (4) to guide the lubricating oil to pass through quickly, and the flow-blocking plane (412) is disposed on the other side of the regulating structure (4) to slow down the flow velocity of the lubricating oil. The pressure difference resistance between the streamlined surface (411) and the flow-blocking plane (412) is used to balance the vibration of the rotor.

2. The oil film damper vibration reduction structure according to claim 1, characterized in that, The adjustment structure (4) is disposed on the outer ring (1) of the bearing, the streamlined surface (411) is disposed on the side facing the direction of rotor rotation to guide the lubricating oil to pass through quickly, and the flow-blocking plane (412) is disposed on the side facing away from the direction of rotor rotation to slow down the flow speed of the lubricating oil.

3. The oil film damper vibration reduction structure according to claim 2, characterized in that, The adjustment structure (4) further includes a recess (42) which is disposed on the flow-blocking plane (412) and is used to disrupt the flow of lubricating oil to form turbulence on the side of the flow-blocking plane (412). The recessed portion (42) is provided in a plurality of manner, and the plurality of recessed portions (42) are irregularly distributed on the flow-blocking plane (412). The size of the plurality of recessed portions (42) is different, or the depth of the plurality of recessed portions (42) is different, or both the size and depth of the recessed portions (42) are different.

4. The oil film damper vibration reduction structure according to claim 3, characterized in that, The streamlined surface (411) is configured as a smooth arc surface, and the flow-blocking plane (412) and the streamlined surface (411) have an arc transition.

5. The oil film damper vibration reduction structure according to any one of claims 1-4, characterized in that, The adjustment structure (4) is provided in a plurality of such structures, which are arranged in a circumferential array along the bearing, and two connected adjustment structures (4) are arranged closely together.

6. The oil film damper vibration reduction structure according to claim 5, characterized in that, The adjustment structure (4) further includes a mounting part (43), which is disposed on the side of the adjustment structure (4) near the outer ring (1) of the bearing; The outer ring (1) of the bearing is provided with a mounting groove (11) corresponding to the mounting part (43), and the mounting part (43) is engaged in the mounting groove (11) to limit the adjustment structure (4).

7. The oil film damper vibration reduction structure according to claim 6, characterized in that, The mounting part (43) is configured as a trapezoidal boss, and the mounting groove (11) is configured as a trapezoidal slot corresponding to the mounting part (43). The mounting part (43) is engaged in the mounting groove (11) to limit and fix the adjustment structure (4) in the circumferential direction of the bearing.

8. The oil film damper vibration reduction structure according to claim 6, characterized in that, The oil film damper vibration reduction structure also includes a limiting element (5); The bottom surface of the mounting groove (11) is also provided with a limiting groove corresponding to the limiting member (5). The limiting member (5) is installed in the limiting groove and is used to fix the adjusting structure (4) axially.

9. The oil film damper vibration reduction structure according to claim 8, characterized in that, The limiting member (5) includes: a first limiting part (51) and a second limiting part (52), wherein the second limiting part (52) is disposed on both sides of the first limiting part (51) along the axial direction of the bearing; The limiting groove includes a first limiting groove (111) and a second limiting groove (112). The second limiting groove (112) is disposed on both sides of the first limiting groove (111) along the axial direction of the bearing. The first limiting groove (111) is disposed corresponding to the first limiting part (51), and the second limiting groove (112) and the second limiting part (52) are disposed corresponding to each other. Wherein, the outer diameter of the first limiting part (51) is larger than the outer diameter of the second limiting part (52), and the outer diameter of the first limiting groove (111) is larger than the outer diameter of the second limiting part (52), so that when the first limiting part (51) is engaged in the first limiting groove (111) and the second limiting part (52) is engaged in the second limiting groove (112), the limiting groove can axially fix the limiting member (5).

10. The oil film damper vibration reduction structure according to claim 9, characterized in that, The second limiting part (52) is bent toward the support seat (2) at one end away from the first limiting part (51). The bent position of the second limiting part (52) away from the first limiting part (51) abuts against both sides of the adjusting structure (4) to limit and fix the adjusting structure (4) in the axial direction of the bearing.

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