Shock absorber

Abstract

The invention provides a shock absorber which comprises a shock absorption body arranged on a bearing shaft in a sleeving mode, the shock absorption body comprises a plurality of frameworks which are sequentially arranged layer by layer from inside to outside, the space between every two adjacent frameworks is filled with a shock absorption layer, and each shock absorption layer is composed of a first shock absorption body and a second shock absorption body; the first buffering channel is arranged between the adjacent ends of the first vibration reduction body and the second vibration reduction body, and after pre-compression, the adjacent ends of the first vibration reduction body and the second vibration reduction body can make contact in the first buffering channel, so that collision between the first vibration reduction body and the second vibration reduction body is relieved, the reliability of the vibration damper is improved, and the service life of the vibration damper is prolonged.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and more specifically, to a vibration damper. Background Technology

[0002] Wind power generation has become an important component of the national sustainable development strategy. Against this backdrop, the supporting infrastructure for low-wind-speed wind farms is constantly improving, and low-wind-speed large-blade wind turbine generators are developing rapidly. However, the pitch control system of these turbines often leads to overload of the transmission system. The gearbox vibration damper is a weak link in this transmission system, typically failing first and affecting the normal operation of the unit. Under increased loads, the size of the vibration damper has not increased further, resulting in a decrease in the upper limit of stiffness, which reduces reliability and service life under heavy load conditions. Summary of the Invention

[0003] One objective of this invention is to provide a vibration damper to mitigate contact and collision between a first vibration damper and a second vibration damper, thereby preventing large deformation of the first and second vibration dampers and improving reliability and service life.

[0004] According to the present invention, a vibration damper is provided, comprising: a vibration damping body sleeved on a bearing shaft, the vibration damping body comprising: a plurality of frames arranged sequentially from the inside to the outside, a vibration damping layer filling the space between two adjacent frames, each vibration damping layer comprising a first vibration damping body and a second vibration damping body, a first buffer channel being provided between the adjacent ends of the first vibration damping body and the second vibration damping body, wherein after pre-compression, the adjacent ends of the first vibration damping body and the second vibration damping body can contact each other inside the first buffer channel to alleviate the collision between the first vibration damping body and the second vibration damping body.

[0005] In a preferred embodiment, the first buffer channel is configured as a double cone.

[0006] In a preferred embodiment, the damper is symmetrical along the vertical direction.

[0007] In a preferred embodiment, the vibration damper includes an inner frame, a middle frame, and an outer frame arranged layer by layer from the inside to the outside, wherein the inner frame, the middle frame, and the outer frame are all constructed in a semi-circular shape.

[0008] In a preferred embodiment, a second buffer channel is provided between the end of the upper damping layer and the end of the lower damping layer, so that after pre-compression, the end of the upper damping layer and the end of the lower damping layer can contact each other within the second buffer channel.

[0009] In a preferred embodiment, the centers of the inner skeleton, middle skeleton, and outer skeleton do not coincide, and all are located on a straight line along the vertical direction.

[0010] In a preferred embodiment, the second buffer channel is configured as a double cone.

[0011] In a preferred embodiment, the first buffer channel is located at the vertical end of the skeleton.

[0012] In a preferred embodiment, the damping layer is made of rubber and is fixed to the frame by vulcanization.

[0013] In a preferred embodiment, the skeleton is made of metal plate.

[0014] This invention has at least the following technical effects: According to the present invention, each damping layer consists of a first damping body and a second damping body, with a first buffer channel provided between the adjacent ends of the first and second damping bodies. In the free state, the first and second damping bodies are not in contact. After pre-compression, the adjacent ends of the first and second damping bodies come into contact inside the first buffer channel. The first buffer channel alleviates the contact collision between the first and second damping bodies to a certain extent, avoiding large deformation of the first and second damping bodies, thereby improving their service life.

[0015] According to the present invention, since the first buffer channel is constructed in a double-conical shape, after pre-compression, the adjacent ends of the first and second dampers first come into contact with each other in the middle to restrict their displacement, preventing the first and second dampers from continuing to stretch. This reduces the strain of the first and second dampers during operation, avoids damage such as bulging, cracking, and peeling of the adhesive surfaces, and improves the overall lifespan of the damping layer. Furthermore, since the first buffer channel is constructed as a double cone, after pre-compression, the adjacent ends of the first damper and the second damper first come into contact with each other in the middle. As the vertical load gradually increases during operation, the contact area between the middle and the sides of the two gradually increases, thereby effectively increasing the nonlinearity of the damper and increasing the vertical stiffness in a limited space.

[0016] According to the present invention, a second buffer channel is provided between the end of the upper damping layer and the end of the lower damping layer, and the second buffer channel is constructed in a double-conical shape. The ends of the upper damping layer and the ends of the lower damping layer first come into contact with each other in the middle, effectively releasing strain. As the lateral load gradually increases during operation, the contact area along the lateral direction gradually increases, and it is squeezed outward along the lateral direction, thereby effectively improving the lateral stiffness of the damping body.

[0017] Furthermore, since the ends of the upper damping layer and the lower damping layer come into contact with and are pressed together, under the overall deformation, the other ends of both are compressed laterally inside the first channel, thereby further improving the lateral stiffness within a limited size. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of a vibration damper according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of the cross-sectional structure of the damping layer of a damper according to an embodiment of the present invention at point A in a free state is shown. Figure 3 A schematic diagram of the cross-sectional structure of the damping layer of a damper according to an embodiment of the present invention at point A after installation is shown. Figure 4 A schematic diagram of the cross-sectional structure of the damping layer of a damper according to an embodiment of the present invention at point A under rated load is shown. Figure 5 A schematic diagram of the cross-sectional structure of the damping layer of a damper according to an embodiment of the present invention at point A under overload is shown. Figure 6 A schematic diagram of the support stiffness curve of the vibration damper of this application is shown. Figure 7 A schematic diagram of the cross-sectional structure of the damping layer of a damper according to an embodiment of the present invention at point B in a free state is shown. Figure 8 A schematic diagram of the cross-sectional structure at point B of a vibration damping layer in the installed state of a vibration damper according to an embodiment of the present invention is shown.

[0019] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0020] 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.

[0021] In the description of this invention, it should be understood that the terms "outer" and "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 limiting this invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] like Figures 1 to 3 As shown, the vibration damper 100 of the present invention includes: a damping body 2, the central part of which has a connecting hole a sleeved on a bearing shaft (not shown in the figure). During the operation of the bearing shaft, the bearing shaft vibrates up, down, left, and right and compresses the damping body 2. The damping body 2 deforms under the compression of the bearing shaft, thereby achieving vibration damping. The damping body 2 includes: a plurality of frames 22 arranged layer by layer from the inside to the outside for support. A damping layer 23 is filled between two adjacent frames 22 for vibration damping. The material of the damping layer 23 can be rubber. Optionally, the damping layer 23 is fixed to the frame 22 by vulcanization. Optionally, the vibration damper 100 also includes a housing, which is sleeved on the outside of the damping body 2 and can be used to fix the vibration damper 100 to a bracket. Optionally, the frame 22 is made of metal plate.

[0024] Each damping layer 23 consists of a first damping element 231 and a second damping element 232, with a first buffer channel p provided between adjacent ends of the first damping element 231 and the second damping element 232. In the free state, the first damping element 231 and the second damping element 232 are not in contact. After pre-compression (i.e., after installation), the adjacent ends of the first damping element 231 and the second damping element 232 come into contact inside the first buffer channel p. The first buffer channel p is used to mitigate the contact collision between the first damping element 231 and the second damping element 232 to a certain extent, avoiding large deformation of the first damping element 231 and the second damping element 232, thereby improving their service life.

[0025] In one or more embodiments, the first buffer channel p is constructed as a double cone, meaning that the ends of the first damper 231 and the second damper 232 are adjacent in the middle and gradually move away from each other towards their sides. After pre-compression, the adjacent ends of the first damper 231 and the second damper 232 first come into contact with each other in the middle to limit their displacement, preventing the first damper 231 and the second damper 232 from continuing to stretch. This reduces the strain of the first damper 231 and the second damper 232 during operation, preventing damage such as bulging, cracking, or peeling of the adhesive surfaces, and improving the overall lifespan of the damping layer 23. Furthermore, since the first buffer channel p is constructed as a double cone, after pre-compression, the adjacent ends of the first damper 231 and the second damper 232 first come into contact with each other at the middle. As the vertical load gradually increases during operation (reaching the rated load or even overload), the contact area from the middle to the sides of both gradually increases (e.g., Figures 4 to 5 As shown), thereby effectively increasing the nonlinearity of the damper 100 (such as...). Figure 6 At the same time, it increases the vertical stiffness within a limited space.

[0026] In one or more embodiments, the first buffer channel p is disposed at any position between two adjacent skeletons 22. Preferably, the first buffer channel p is disposed at the end point of the skeleton 22 along the vertical direction.

[0027] like Figure 1 , Figure 7 as well as Figure 8 As shown, in one or more embodiments, the vibration damper 2 of the present invention is symmetrical along the vertical direction. In this embodiment, the vibration damper 2 includes: an inner frame, a middle frame, and an outer frame arranged sequentially from the inside to the outside. The inner frame, middle frame, and outer frame are all constructed in a semi-circular shape, and a vibration damping layer 23 is filled between two adjacent frames 22. In the free state, a second buffer channel q is provided at the end of the upper vibration damping layer 23 and the end of the lower vibration damping layer 23. After pre-compression, the end of the upper vibration damping layer 23 and the end of the lower vibration damping layer 23 can contact each other within the second buffer channel q. The second buffer channel q is used to alleviate the contact collision between the upper and lower vibration damping layers to a certain extent, avoiding large deformation of both, thereby improving service life.

[0028] Optionally, the second buffer channel q is constructed as a double cone. The ends of the upper damping layer 23 and the lower damping layer 23 first come into contact with each other at the middle, effectively releasing strain. As the lateral load (perpendicular to the vertical direction) gradually increases during operation (reaching the rated load or even overload), the contact area along the lateral direction gradually increases, and it is squeezed outward along the lateral direction, thereby effectively improving the lateral stiffness of the damper 2. Furthermore, since the ends of the upper damping layer 23 and the lower damping layer 23 come into contact with and are squeezed together, under the overall deformation, the other ends of both are squeezed laterally inside the first channel p, thereby further improving the lateral stiffness within a limited size.

[0029] In this embodiment, optionally, the centers of the inner frame, middle frame, and outer frame do not coincide, but are located on a straight line along the vertical direction, so as to have a certain amount of eccentricity.

[0030] The vibration damper 100 described in this invention is mainly used for buffering and vibration reduction of doubly fed wind turbines, and is also applicable to vibration isolation systems of locomotives, ships, engineering machinery and other equipment.

[0031] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A vibration damper, comprising: A vibration damper is fitted onto a bearing shaft. The vibration damper includes multiple frames arranged layer by layer from the inside to the outside. A vibration damping layer is filled between two adjacent frames. Each vibration damping layer consists of a first vibration damper and a second vibration damper. A first buffer channel is provided between the adjacent ends of the first vibration damper and the second vibration damper. After pre-compression, the adjacent ends of the first vibration damper and the second vibration damper can contact each other inside the first buffer channel to alleviate the collision between the first vibration damper and the second vibration damper.

2. The vibration damper according to claim 1, characterized in that, The first buffer channel is constructed as a double cone.

3. The vibration damper according to claim 2, characterized in that, The vibration damper is symmetrical along the vertical direction.

4. The vibration damper according to claim 3, characterized in that, The vibration damper includes an inner frame, a middle frame, and an outer frame arranged layer by layer from the inside to the outside, and the inner frame, the middle frame, and the outer frame are all constructed in a semi-circular shape.

5. The vibration damper according to claim 4, characterized in that, A second buffer channel is provided between the end of the upper damping layer and the end of the lower damping layer. After pre-compression, the end of the upper damping layer and the end of the lower damping layer can contact each other within the second buffer channel.

6. The vibration damper according to claim 4, characterized in that, The centers of the inner frame, middle frame, and outer frame do not coincide, and all are located on a straight line along the vertical direction.

7. The vibration damper according to claim 5, characterized in that, The second buffer channel is constructed as a double cone.

8. The vibration damper according to any one of claims 1 to 7, characterized in that, The first buffer channel is located at the vertical end of the skeleton.

9. The vibration damper according to claim 8, characterized in that, The vibration damping layer is made of rubber and is fixed to the frame by vulcanization.

10. The vibration damper according to claim 9, characterized in that, The frame is made of metal plates.

Images