Fan universal elastic damping support structure

Abstract

This utility model discloses an omnidirectional elastic vibration damping support structure for wind turbines, belonging to the technical field of wind power generation equipment. The structure includes a rear hinged vibration damping module and a front buffer limiting module. The rear module, through a rubber bushing fitted around the hinge pin, achieves a flexible hinge connection between the main load-bearing beam and the lower platform, used to buffer longitudinal and torsional vibrations. The front module, located between the front of the beam and the platform, includes rubber pads and limiting baffles in the vertical direction, as well as lateral rubber pads and limiting baffles in the horizontal direction, jointly achieving multi-directional vibration damping and displacement limitation. Through the synergistic effect of the front and rear modules, this utility model forms an omnidirectional elastic constraint system, which can effectively attenuate multi-dimensional vibrations generated during wind turbine operation, block the transmission of vibration energy to the tower, and significantly alleviate stress concentration at connection points, thereby improving the stability, safety, and service life of the wind turbine.

Description

Technical Field

[0001] This utility model belongs to the field of wind power equipment structure technology, specifically relating to a composite vibration damping support device installed between the main load-bearing beam and the lower platform of a wind turbine generator set. It is particularly suitable for suppressing multi-dimensional vibrations caused by wind turbine rotation, aerodynamic load fluctuations, and transmission chain operation, aiming to improve the unit's operational stability, structural safety, and overall service life. Background Technology

[0002] In megawatt-class wind turbine generators, the main load-bearing beam (usually the main frame or drivetrain support beam) is a key component that transmits the rotor load to the tower. During unit operation, due to wind shear, tower shadow effect, yaw motion, and drivetrain torque fluctuations, the main load-bearing beam will be subjected to complex front-to-back, up-and-down, left-to-right, and axial torsional vibrations.

[0003] Current mainstream support solutions have significant limitations: 1. Rigid Connection Scheme: The main load-bearing beam is rigidly connected to the lower platform via flanges or welding. Although this method has a strong load-bearing capacity, it transmits vibrations to the tower foundation without attenuation, leading to fatigue of the tower welds, loosening of bolts, and fretting wear of the foundation, significantly shortening the structural life.

[0004] 2. Single-dimensional elastic support scheme: Rubber pads or spring isolators are only installed in the vertical direction. This type of design has a certain buffering effect on vertical vibration, but it has almost no ability to suppress vibrations caused by horizontal thrust and torsional loads, and may cause beam instability due to insufficient stiffness in non-support directions.

[0005] 3. Stress concentration at the connection: Under alternating loads, the above-mentioned traditional connection methods are prone to high stress concentration at the connection interface, which becomes a dangerous source of fatigue crack initiation.

[0006] Therefore, there is an urgent need to develop an integrated vibration damping support structure that can achieve omnidirectional elastic constraint in space, efficiently dissipate vibration energy, and release connection stress. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a reasonably constructed and reliable universal elastic vibration damping support structure for wind turbines. This structure, through the coordinated design of a rear flexible hinge and a front multi-dimensional limiting buffer group, effectively suppresses and isolates the vibration of the main load-bearing beam in six degrees of freedom, fundamentally blocking the transmission path of vibration energy to the tower. Simultaneously, it eliminates stress concentration at connection points, ensuring the long-term stable operation of the wind turbine under all operating conditions.

[0008] To solve the aforementioned technical problems, the present invention adopts the following technical solution: a universal elastic vibration damping support structure for wind turbines, used to connect the main load-bearing beam and the lower platform. This structure is mainly composed of two organically integrated parts: a rear hinged vibration damping module and a front four-way buffer limiting module.

[0009] 1. Rear hinge vibration damping module, which is one of the main load-bearing and core vibration damping units of the system; Connecting body: A hinge connector is used. One end of the connector is rigidly fixed to the reserved base of the lower platform by a group of high-strength bolts, and the other end is provided with a transverse through-pin.

[0010] Flexible vibration damping unit: A rubber bushing is interference-fitted onto the outer circumference of the pin. The outer diameter of this rubber bushing is tightly fitted with the inner diameter of the shaft hole of the hinge lug at the rear end of the main load-bearing beam. Thus, the rear end of the main load-bearing beam achieves a flexible connection with the hinge connector through this rubber bushing. The rubber bushing is made of vulcanized high-damping natural rubber or neoprene rubber, and its internal structure can be designed with a hollow structure to optimize stiffness distribution.

[0011] 2. Front four-way buffer limit module; This module is located below and to the side of the front section of the main load-bearing beam and is connected to the lower platform. It mainly provides multi-directional elastic support and displacement safety limit.

[0012] Lower vertical buffer unit: At least one first rubber pad is installed directly below the front of the main load-bearing beam. This pad is bonded or fixed to the upper surface of the lower platform by a pressure plate, and its top surface maintains a preset pre-compression contact or a small gap with the bottom surface of the beam.

[0013] Upper vertical limiting unit: An upper limiting baffle is installed at the position on the upper surface of the main load-bearing beam corresponding to the position above the first rubber pad. The baffle is fixed to the bracket extending from the lower platform by bolts, and a designed gap is left between its lower edge and the upper surface of the beam, which is greater than the normal compression stroke of the rubber pad.

[0014] Lateral horizontal buffer limiting unit: Two sets of structures are symmetrically arranged on the left and right sides of the front of the main load-bearing beam. Each set includes a lateral rubber pad and a lateral limiting baffle. The lateral rubber pad is bonded and fixed to the lateral upright plate of the lower platform, with its inner side in contact with the side of the beam. The lateral limiting baffle is installed parallel to the outside of the rubber pad and fixed with bolts, and the gap between its inner side and the side of the beam is the design gap.

[0015] Specifically, this utility model provides a universal elastic vibration damping support structure for a wind turbine, used to connect the main load-bearing beam of the wind turbine to the lower platform, including: a rear hinge vibration damping module and a front buffer limiting module; The rear hinge vibration damping module includes a hinge connector and a rubber bushing. The hinge connector is fixed to the lower platform, and the rear end of the main load-bearing beam is flexibly hinged to the hinge connector through the rubber bushing. The front buffer limiting module is located between the front of the main load-bearing beam and the lower platform, and includes at least one first buffer unit for buffering vertical vibration and a lateral buffer limiting unit for buffering horizontal vibration and limiting displacement.

[0016] Furthermore, the hinge connector has a pin, the rubber bushing is interference-fitted onto the pin, and the outer circumferential surface of the rubber bushing mates with the hinge hole at the rear end of the main load-bearing beam.

[0017] Furthermore, the first buffer unit includes a first rubber pad disposed below the front part of the main load-bearing beam, and an upper limiting baffle disposed above the front part of the main load-bearing beam, wherein the upper limiting baffle and the upper surface of the main load-bearing beam have a first design gap.

[0018] Furthermore, the lateral buffer limiting unit includes lateral rubber pads and lateral limiting baffles symmetrically arranged on the left and right sides of the main load-bearing beam. The lateral rubber pads are in contact with the side of the beam, and the lateral limiting baffles have a second design gap with the side of the beam.

[0019] Furthermore, the first rubber pad is in pre-compression contact with the bottom surface of the main load-bearing beam.

[0020] Furthermore, the lateral rubber pad is bonded and fixed to the lateral upright plate of the lower platform.

[0021] Furthermore, the rubber bushing has an internal perforated structure for adjusting stiffness.

[0022] Furthermore, the rubber bushing, the first rubber pad, and the lateral rubber pad are made of high-damping rubber material.

[0023] Compared with existing technologies, this invention offers the following advantages: Through spatial partitioning, it specifically buffers vibrations in different directions, with particularly significant suppression of difficult-to-handle horizontal and torsional vibrations. Utilizing the damping properties of rubber materials to convert mechanical energy into heat energy instead of transmitting it, it reduces the dynamic stress amplitude transmitted to critical parts of the tower, directly extending the fatigue life of the tower and foundation. The flexible hinge design transforms rigid nodes into flexible nodes, greatly improving connection reliability and fatigue resistance. The front module provides elastic support while employing an adjustable gap design for non-intrusive mechanical limiting, ensuring structural safety under extreme loads and preventing catastrophic failure. This invention achieves modular structure, with standard rubber components, facilitating installation, inspection, and replacement. It is suitable for new units and upgrades of existing units, with low life-cycle costs. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] Figure 2 for Figure 1 A top-view structural diagram.

[0027] Figure 3 This is a schematic diagram of the connection structure between the hinge connector and the rubber bushing in this utility model.

[0028] In the diagram: 1 is the lower platform, 2 is the main load-bearing beam, 3 is the hinge connector, 4 is the rubber bushing, 5a is the first rubber pad, 5b is the lateral rubber pad, 6a is the upper limiting baffle, and 6b is the lateral limiting baffle. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, during installation, the hinge connector 3 is first precisely aligned and securely installed on the reinforcing base of the lower platform 1 using pre-tightened bolts. Then, the rubber bushing 4 is pressed into the hinge lug hole at the rear end of the main load-bearing beam 2. The beam is then hoisted into position, aligning the lug hole with the pin of the hinge connector 3, and the pin is inserted to complete the rear connection.

[0031] The installation of the front module requires precise measurement and positioning. The first rubber pad 5a is installed on the platform directly below the front of the beam. Its top height can be adjusted using shims to achieve slight pre-compression contact with the bottom surface of the beam. Then, the upper limiting baffle 6a is installed, ensuring that the gap between its lower edge and the upper surface of the beam meets design requirements. This gap should be greater than the compression of the rubber pad 5a under the maximum expected load.

[0032] For the lateral components, first attach the lateral rubber pad 5b to the upright plate on the side of the platform, ensuring that its inner side is parallel to and slightly in contact with the side of the beam. Finally, install the lateral limiting baffle 6b, adjust its position to ensure uniform gap, and tighten the bolts.

[0033] The entire installation process must ensure that there is no initial tearing or excessive twisting of any rubber components, and that the limit gaps are uniform and accurate. After the system is put into operation, the slight deformation of the rubber components under load can effectively absorb vibration, while the limit devices remain stationary, intervening only in extreme cases, achieving the ideal working state of normal flexible constraint and transient hard limit.

[0034] The working principle of this utility model: When the wind turbine vibrates during operation, the load is transferred to this support structure through the main load-bearing beam 2. The energy dissipation and motion constraint process is as follows: 1. Working mechanism of the rear module: Forward and backward (X-axis) vibration and torsional (around the Y-axis) vibration: When the rear end of the main load-bearing beam 2 attempts to swing or twist relative to the hinge connector 3, it will force the rubber bushing 4 to produce significant shear deformation and compression-tension cyclic deformation. The internal friction characteristics of the rubber material will convert most of the vibration kinetic energy into heat energy dissipation, thereby significantly attenuating the vibration transmission in this direction.

[0035] Stress relief: The flexibility of the rubber bushing 4 fundamentally changes the rigid boundary conditions of the traditional pin connection, allowing for slight coordinated deformation at the connection, thereby releasing local peak stress.

[0036] 2. Working mechanism of the front module: Vertical (Z-direction) vibration: When the beam moves downward, it compresses the first rubber pad 5a, and the pad absorbs energy through compression deformation; when the beam moves upward, its displacement is constrained by the upper limiting baffle 6a, and at the moment of contact, it is transmitted to the buffer pad (if set) through the baffle or borne by the rigidity of the beam itself to prevent it from slipping out.

[0037] Horizontal vibration (Y direction): When the beam moves to the left or right, the lateral rubber pad 5b on that side is compressed to buffer the vibration; when the displacement exceeds the design gap, the lateral limiting baffle 6b contacts the beam to prevent it from moving further and ensure safety.

[0038] Auxiliary suppression of torsion around the X-axis: Rubber pads 5b symmetrically arranged on both sides of the front can provide differentiated lateral resistance when the beam undergoes slight torsion, forming a resisting torque and assisting the rear hinge in suppressing torsional vibration.

[0039] The rear module and the front module of this invention together constitute a statically determinate and flexible spatial support system. The rear hinge provides the degree of freedom of rotation about the Z-axis and buffers X-axis and torsional vibrations; the front module provides Z-axis support and constrains Y-axis and X-axis displacements. Together, they achieve effective elastic constraint and vibration suppression of five of the six degrees of freedom of the main load-bearing beam (except for rotation about the Z-axis), systematically converting broadband vibration energy into heat dissipation through the hysteretic deformation of the rubber material at multiple contact interfaces, thereby significantly reducing the dynamic load transmitted to the lower platform 1 and the tower.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A universal elastic vibration damping support structure for a wind turbine, used to connect the main load-bearing beam (2) of the wind turbine to the lower platform (1), characterized in that, include: Rear hinge vibration damping module and front buffer limiting module; The rear hinge vibration damping module includes a hinge connector (3) and a rubber bushing (4). The hinge connector (3) is fixed to the lower platform (1). The rear end of the main load-bearing beam (2) is flexibly hinged to the hinge connector (3) through the rubber bushing (4). The front buffer limiting module is located between the front of the main load-bearing beam (2) and the lower platform (1), including at least one first buffer unit for buffering vertical vibration and a lateral buffer limiting unit for buffering horizontal vibration and limiting displacement. The first buffer unit includes a first rubber pad (5a) disposed below the front part of the main load-bearing beam (2) and an upper limiting baffle (6a) disposed above the front part of the main load-bearing beam (2). The upper limiting baffle (6a) and the upper surface of the main load-bearing beam (2) have a first design gap. The lateral buffer limiting unit includes lateral rubber pads (5b) and lateral limiting baffles (6b) symmetrically arranged on the left and right sides of the main load-bearing beam (2). The lateral rubber pads (5b) are in contact with the side of the beam, and the lateral limiting baffles (6b) have a second design gap with the side of the beam.

2. The wind turbine universal elastic vibration damping support structure according to claim 1, characterized in that, The hinge connector (3) has a pin, the rubber bushing (4) is interference-fitted outside the pin, and the outer circumferential surface of the rubber bushing (4) is matched with the hinge hole at the rear end of the main load-bearing beam (2).

3. The wind turbine universal elastic vibration damping support structure according to claim 1, characterized in that, The first rubber pad (5a) is in pre-compression contact with the bottom surface of the main load-bearing beam (2).

4. The wind turbine universal elastic vibration damping support structure according to claim 1, characterized in that, The lateral rubber pad (5b) is bonded and fixed to the lateral upright plate of the lower platform (1).

5. The wind turbine universal elastic vibration damping support structure according to claim 2, characterized in that, The rubber bushing (4) has a hollow structure inside for adjusting stiffness.

6. The wind turbine universal elastic vibration damping support structure according to any one of claims 1-5, characterized in that, The rubber bushing (4), the first rubber pad (5a), and the lateral rubber pad (5b) are made of high-damping rubber material.

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