Wind turbine gearbox support with shock absorption function and shock absorption control method thereof

Abstract

The present application provides a wind turbine gearbox support with a shock-absorbing function and a shock-absorbing control method thereof, which belongs to the technical field of wind turbine vibration control. The present application can obtain a quasi-zero stiffness characteristic through the cooperation of a spring and a magnet group, which not only has a wider quasi-zero stiffness range, greater bearing capacity and stability, can realize an adjustable and controllable positive and negative stiffness mechanism, but also can derive and realize multi-order negative stiffness characteristics, which can effectively play an energy-absorbing and shock-absorbing role on the gearbox and ensure the stability of the gearbox.

Description

Technical Field

[0001] The present application belongs to the technical field of wind turbines, and in particular relates to a wind turbine gearbox support with a shock-absorbing function and a shock-absorbing control method thereof. Background Art

[0002] Wind turbines are electrical equipment that converts wind energy into mechanical energy and mechanical energy into electrical energy. Wind turbines are equipped with gearboxes for transmission. Due to the wind load, wind turbines are prone to vibration. In order to ensure the stability of the gearbox, a shock-absorbing support is required to support the gearbox to reduce the vibration of the gearbox.

[0003] In the related art, a shock absorbing spring is usually arranged in the support to dissipate energy. However, the shock absorbing structure of this structure has the problem that the quasi-zero stiffness range is limited and the stiffness cannot be adjusted.

[0004] Therefore, it is necessary to provide a wind turbine gearbox support with a shock absorbing function and a shock absorbing control method thereof to solve the problems raised in the above background technology. Summary of the invention

[0005] The present application provides a wind turbine gearbox support with a shock-absorbing function and a shock-absorbing control method thereof, which has a quasi-zero stiffness characteristic, can achieve low-frequency vibration isolation, and after optimization has a wider quasi-zero stiffness range, greater bearing capacity and stability, can realize an adjustable and controllable positive and negative stiffness mechanism, and can derive to realize multi-order negative stiffness characteristics, which can effectively alleviate the vibration of the gearbox in the wind turbine.

[0006] In order to solve the above technical problems, the technical solution of this application is:

[0007] The present application provides a wind turbine gearbox support with a shock absorbing function, comprising:

[0008] A support body, the bottom of which is recessed to form a mounting groove; and

[0009] A shock absorbing platform is installed in the installation groove and connected to the support body and the fixing member, and the shock absorbing platform includes:

[0010] An upper platform plate and a lower platform plate arranged in parallel and spaced apart, wherein the upper platform plate is fixed to the bottom of the mounting groove, and the lower platform plate is fixed to the fixing member;

[0011] A connecting block, suspended between the upper platform plate and the lower platform plate;

[0012] A slide bar, wherein the slide bar is fixed to the connection block and extends in a horizontal direction, at least two of the slide bars are distributed in a ring array along the central axis of the connection block, each of the slide bars is provided with a first magnet group, the first magnet group includes a first magnet and a second magnet arranged opposite to each other, the first magnet is fixedly sleeved on one end of the slide bar close to the connection block, the second magnet is movably sleeved on the slide bar unit, and a magnetic force is generated between the first magnet and the second magnet;

[0013] The second magnet group includes a third magnet and a fourth magnet, the third magnet is fixed to the connecting block, the fourth magnet is spaced apart from the third magnet in a vertical direction, and the fourth magnet is fixed to the lower platform plate, and a magnetic force is generated between the third magnet and the fourth magnet;

[0014] A driving assembly, comprising a sliding sleeve movably mounted on the sliding rod, the second magnet being fixed to the sliding sleeve, and the driving assembly being fixed to the upper platform plate and the lower platform plate, and used for converting the vibration force of the upper and lower towers of the offshore wind turbine received by the upper platform plate or the lower platform plate into a driving force, so as to drive the sliding sleeve to move linearly along the sliding rod;

[0015] The first magnet, the second magnet, the third magnet and the fourth magnet are all electromagnets.

[0016] Preferably, the first magnet and the second magnet are arranged opposite to each other on sides having the same magnetic properties.

[0017] Preferably, the first magnet and the second magnet are arranged opposite to each other on their magnetically opposite sides.

[0018] Preferably, the third magnet and the fourth magnet are arranged opposite to each other on the sides having the same magnetic properties.

[0019] Preferably, the third magnet and the fourth magnet are arranged opposite to each other on their magnetically opposite sides.

[0020] Preferably, the driving assembly further includes a first parallelogram frame and a second parallelogram frame, wherein the first parallelogram frame and the second parallelogram frame are located at the upper and lower ends of the sliding sleeve and are both hinged to the sliding sleeve.

[0021] Preferably, the number of the drive components is at least one. When the number of the drive components is multiple, the multiple drive components are connected in a stacked manner, and the second parallelogram frame of the upper drive component serves as the first parallelogram frame of the lower drive component to form a composite frame with multiple degrees of freedom. The sliding sleeve in any one of the drive components is movably mounted on the sliding rod.

[0022] Preferably, the first parallelogram frame includes two mutually parallel first connecting rods and a first spring arranged along the diagonal of the first parallelogram frame; the second parallelogram frame includes two mutually parallel second connecting rods and a second spring arranged along the diagonal of the second parallelogram frame, the axes of the first spring and the second spring are not parallel, one of them acts as a compression spring and the other acts as a tension spring, and within the working stroke range, the compression spring provides positive stiffness and the tension spring provides negative stiffness.

[0023] Preferably, the number of the first connecting rods is two, and the two first connecting rods are arranged at both ends of the sliding sleeve; the number of the second connecting rods is four, and they are arranged in groups of two at both ends of the sliding sleeve; two mounting plates are protruding from the sliding sleeve, the first connecting rod is clamped between the two mounting plates, and the second connecting rod is located outside the two mounting plates, and a pin is provided on the mounting plate, and one first connecting rod and two second connecting rods located at the same end of the sliding sleeve are hinged to the same pin.

[0024] The present application also provides a vibration reduction control method for the above-mentioned wind turbine gearbox support with vibration reduction function, comprising the following steps:

[0025] Real-time monitoring of electromagnetic changes of the first magnet, the second magnet, the third magnet and the fourth magnet;

[0026] Real-time monitoring of the vibration amount of the support body;

[0027] If the vibration amount of the support body exceeds a preset threshold, the input current of the first magnet, the second magnet, the third magnet and the fourth magnet is adjusted to compensate for the electromagnetic force between the first magnet and the second magnet or the third magnet and the fourth magnet, so that the vibration amount of the support body is reduced below the threshold.

[0028] The beneficial effects of this application are:

[0029] Through the cooperation of the spring and the magnet group, a quasi-zero stiffness characteristic can be obtained. It not only has a wider quasi-zero stiffness range, greater bearing capacity and stability, and can realize an adjustable and controllable positive and negative stiffness mechanism, but also can derive and realize multi-order negative stiffness characteristics, which can effectively play an energy-consuming and shock-absorbing role on the gearbox and ensure the stability of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram showing the structure of a wind turbine gearbox support with a shock-absorbing function provided by the present application;

[0031] Figure 2 express Figure 1 The three-dimensional structural diagram of the shock absorbing platform shown;

[0032] Figure 3 express Figure 2 Schematic diagram of the exploded structure of the shock absorbing platform shown;

[0033] Figure 4 express Figure 3 A schematic diagram of the connection structure of the connecting block, the sliding rod, the first magnet group, the second magnet group and the driving assembly shown;

[0034] Figure 5 A schematic diagram showing the distribution of the slide bars and the drive components in this embodiment;

[0035] Figure 6 A schematic diagram showing a distribution of the slide bars and the drive components in other embodiments;

[0036] Figure 7 A schematic diagram showing another distribution of the slide bars and the drive components in other embodiments;

[0037] Figure 8 A schematic diagram showing the structure of a drive component in other embodiments. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Please refer to Figure 1-Figure 8 The present application provides a wind turbine gearbox support with a shock-absorbing function, which is used to support the gearbox in the wind turbine.

[0040] The wind turbine gearbox support with shock absorption function includes a support body 200 and a shock absorption platform 100. The bottom of the support body 200 is recessed to form a mounting groove 210. The shock absorption platform 100 is installed in the mounting groove 210 and connects the support body 200 and the fixing component.

[0041] The shock absorbing platform 100 includes an upper platform plate 10 , a lower platform plate 20 , a connecting block 30 , a sliding rod 40 , a first magnet group 50 , a second magnet group 60 and a driving assembly 70 .

[0042] The upper platform plate 10 is fixed to the bottom of the mounting groove 210 , and the lower platform plate 20 is fixed to the fixing member. The upper platform 10 and the lower platform 20 are arranged in parallel and spaced apart, and the vibration generated by the gear box is received by the upper platform plate 10 .

[0043] The connection block 30 is suspended between the upper platform plate 10 and the lower platform plate 20 .

[0044] The slide rod 40 is fixed to the connection block 30 and extends in the horizontal direction. At least two slide rods 40 are distributed in a ring array along the central axis of the connection block 30 . A first magnet group 50 is disposed on each slide rod 40 .

[0045] like Figure 5 As shown, in this embodiment, the number of the sliding bars 40 is four. In other embodiments, the number of the sliding bars 40 can also be any other number, such as Figure 6 Two of them, Figure 7 Three of them.

[0046] The first magnet group 50 includes a first magnet 51 and a second magnet 52 that are arranged opposite to each other. The first magnet 51 is fixedly mounted on one end of the sliding rod 40 close to the connecting block 30, and the second magnet 52 is movably mounted on the sliding rod unit 41. A magnetic force is generated between the first magnet 51 and the second magnet 52.

[0047] The second magnet group 60 includes a third magnet 61 and a fourth magnet 62, wherein the third magnet 61 is fixed to the connecting block 30, the fourth magnet 62 is spaced apart from the third magnet 61 in the vertical direction, and the fourth magnet 62 is fixed to the lower platform plate 20, and a magnetic force is generated between the third magnet 61 and the fourth magnet 62.

[0048] The driving assembly 70 is fixed to the upper platform plate 10 and the lower platform plate 20. The driving assembly 70 includes a sliding sleeve 71, a first parallelogram frame 72 and a second parallelogram frame 73. The sliding sleeve 71 is movably mounted on the sliding rod 40, the first parallelogram frame 72 and the second parallelogram frame 73 are located at the upper and lower ends of the sliding sleeve 71, and are both hinged to the sliding sleeve 71. The driving assembly 70 is used to drive the sliding sleeve 71 to move linearly along the sliding rod 40.

[0049] The number of the driving components 70 is at least one. When the number of the driving components 70 is multiple, the multiple driving components 70 are connected in a stacked manner, that is, the multiple sliding sleeves 71 are arranged in parallel in the vertical direction, and the second parallelogram frame of the upper driving component 70 serves as the first parallelogram frame of the lower driving component 70 to form a composite frame with multiple degrees of freedom. At the same time, the sliding sleeve 71 in any one of the driving components 70 can be movably mounted on the sliding rod 40.

[0050] In this embodiment, the number of the driving assembly 70 is one, the upper end of the first frame 72 is hinged to the upper platform plate 10, and the lower end is hinged to the sliding sleeve 71; the upper end of the second frame 73 is hinged to the sliding sleeve 71, and the lower end is hinged to the lower platform plate 20.

[0051] The first parallelogram frame 72 includes two mutually parallel first connecting rods 721 and a first spring 722 arranged along the diagonal of the first parallelogram frame 72; the second parallelogram frame 73 includes two mutually parallel second connecting rods 731 and a second spring 732 arranged along the diagonal of the second parallelogram frame 73, the axes of the first spring 722 and the second spring 732 are not parallel, one of them acts as a compression spring and the other acts as a tension spring. The number of the first connecting rods 72 is two, and the two first connecting rods 72 are arranged at both ends of the sliding sleeve 71; the number of the second connecting rods 74 is four, and they are arranged in groups of two at both ends of the sliding sleeve 71.

[0052] Furthermore, two mounting plates 711 are protrudingly formed on the sliding sleeve 71, the first connecting rod 721 is clamped between the two mounting plates 711, the second connecting rod 731 is located outside the two mounting plates 711, and a pin is provided on the mounting plate 711, and one of the first connecting rods 721 and two of the second connecting rods 731 located at the same end of the sliding sleeve 71 are hinged to the same pin.

[0053] Based on the principle of bionic joints, each of the driving components 70 can be regarded as a joint, and the first parallelogram frame 72 can be regarded as a segment of the joint; the second parallelogram frame 73 can be regarded as another segment of the joint. When the upper platform plate 10 and the lower platform plate 20 receive vibration input, the force is transmitted to the driving component 70, and the first parallelogram frame 72 and the second parallelogram frame 73 are deformed accordingly, and the length of the diagonal changes. The corresponding compression spring is compressed to provide positive stiffness; the corresponding tension spring is stretched to provide negative stiffness within a certain working stroke compression range.

[0054] As the drive assembly 70 deforms, components of force in the horizontal and vertical directions are generated, driving the sleeve 71 to change position in both the horizontal and vertical directions. In the horizontal direction, the movement of the sleeve 71 drives the first magnet 51 to move along the slide rod 40, causing the distance between the first magnet 51 and the second magnet 52 to change, resulting in a change in magnetic force and a change in stiffness. When the first magnet 51 and the second magnet 52 are facing each other on the same side, a repulsive magnetic force is generated, providing positive stiffness within a certain working stroke compression range; when the first magnet 51 and the second magnet 52 are facing each other on the opposite side, an attractive magnetic force is generated, providing negative stiffness.

[0055] In the vertical direction, the movement of the sleeve 71 will drive the slide rod 40 and the third magnet 61 to move as a whole, so that the distance between the third magnet 61 and the fourth magnet 62 will change, bringing about a change in magnetic force and forming a change in stiffness. When the third magnet 61 and the fourth magnet 62 are facing each other on the same side of magnetic field, a repulsive magnetic force is generated to provide positive stiffness; when the third magnet 61 and the fourth magnet 62 are facing each other on the opposite side of magnetic field, an attractive magnetic force is generated to provide negative stiffness.

[0056] The compression spring, the tension spring, and the first magnet group 50 and the second magnet group 60 system act to change the stiffness of the system. By changing the magnetic poles, area, and relative distance of the magnets in the first magnet group 50 and the second magnet group 60, the magnitude of the magnetic force can be adjusted to obtain a flexible and variable nonlinear stiffness. In addition, the stiffness of the first spring 73 and the second spring 75 in the drive 70, the length of the connecting rod, and the initial angle with the vertical direction can also be adjusted to obtain a flexible and variable stiffness, so that the system has a flexible positive and negative stiffness adjustment mechanism. The combination of the two methods can make the positive and negative stiffness in the system compensate for each other, so that within a certain working stroke compression range, the stiffness of the system is almost zero, thereby achieving quasi-zero stiffness. Through parameter optimization, a wider quasi-zero stiffness range can be obtained.

[0057] Specifically, the first magnet 51, the second magnet 52, the third magnet 61 and the fourth magnet 62 are all electromagnets, which can be directly used to change the magnitude of the electromagnetic force by controlling the input of current.

[0058] The present application also provides a vibration reduction control method for the above-mentioned wind turbine gearbox support with vibration reduction function, comprising the following steps:

[0059] Real-time monitoring of electromagnetic changes of the first magnet, the second magnet, the third magnet and the fourth magnet;

[0060] Real-time monitoring of the vibration amount of the support body;

[0061] If the vibration amount of the support body exceeds a preset threshold, the input current of the first magnet, the second magnet, the third magnet and the fourth magnet is adjusted to compensate for the electromagnetic force between the first magnet and the second magnet or the third magnet and the fourth magnet, so that the vibration amount of the support body is reduced below the threshold.

[0062] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A wind turbine gearbox support with a shock-absorbing function, characterized in that: include: A support body, wherein the bottom of the support body is recessed to form a mounting groove; and A shock absorbing platform is installed in the installation groove and connected to the support body and the fixing member, and the shock absorbing platform includes: An upper platform plate and a lower platform plate arranged in parallel and spaced apart, wherein the upper platform plate is fixed to the bottom of the mounting groove, and the lower platform plate is fixed to the fixing member; A connecting block, suspended between the upper platform plate and the lower platform plate; A slide bar, wherein the slide bar is fixed to the connection block and extends in a horizontal direction, at least two of the slide bars are distributed in a ring array along the central axis of the connection block, each of the slide bars is provided with a first magnet group, the first magnet group includes a first magnet and a second magnet arranged opposite to each other, the first magnet is fixedly sleeved on one end of the slide bar close to the connection block, the second magnet is movably sleeved on the slide bar unit, and a magnetic force is generated between the first magnet and the second magnet; The second magnet group includes a third magnet and a fourth magnet, the third magnet is fixed to the connecting block, the fourth magnet is spaced apart from the third magnet in a vertical direction, and the fourth magnet is fixed to the lower platform plate, and a magnetic force is generated between the third magnet and the fourth magnet; A driving assembly, comprising a sliding sleeve movably mounted on the sliding rod, the second magnet being fixed to the sliding sleeve, and the driving assembly being fixed to the upper platform plate and the lower platform plate, and being used for converting the vibration force of the gear box received by the upper platform plate into a driving force, so as to drive the sliding sleeve to move linearly along the sliding rod; The first magnet, the second magnet, the third magnet and the fourth magnet are all electromagnets; The driving assembly further comprises a first parallelogram frame and a second parallelogram frame, wherein the first parallelogram frame and the second parallelogram frame are located on the upper and lower sides of the sliding sleeve and are both hinged to the sliding sleeve; The first parallelogram frame includes two mutually parallel first connecting rods and a first spring arranged along the diagonal line of the first parallelogram frame, and the two first connecting rods are arranged at two ends of the sliding sleeve; The second parallelogram frame comprises four second connecting rods parallel to each other and second springs arranged along the diagonal lines of the second parallelogram frame, and the four second connecting rods are arranged in groups of two at both ends of the sliding sleeve; The axes of the first spring and the second spring are not parallel, one of them acts as a compression spring and the other acts as a tension spring. Within the working stroke range, the compression spring provides positive stiffness and the tension spring provides negative stiffness.

2. The wind turbine gearbox support with shock absorption function according to claim 1, characterized in that: The first magnet and the second magnet are arranged opposite to each other on the sides having the same magnetic properties.

3. The wind turbine gearbox support with shock absorption function according to claim 1, characterized in that: The first magnet and the second magnet are arranged opposite to each other on their magnetically opposite sides.

4. The wind turbine gearbox support with shock absorption function according to claim 2 or 3, characterized in that: The third magnet and the fourth magnet are arranged opposite to each other on the sides having the same magnetic properties.

5. The wind turbine gearbox support with shock absorption function according to claim 2 or 3, characterized in that: The third magnet and the fourth magnet are arranged opposite to each other on their magnetically opposite sides.

6. The wind turbine gearbox support with shock absorption function according to claim 1, characterized in that: Two mounting plates are protruding from the sliding sleeve, the first connecting rod is clamped between the two mounting plates, the second connecting rod is located outside the two mounting plates, a pin is provided on the mounting plate, and one of the first connecting rods and two of the second connecting rods located at the same end of the sliding sleeve are hinged to the same pin.

7. A method for controlling a wind turbine gearbox support with a shock absorbing function according to any one of claims 1 to 6, characterized in that: The steps include: Real-time monitoring of electromagnetic changes of the first magnet, the second magnet, the third magnet and the fourth magnet; Real-time monitoring of the vibration amount of the support body; If the vibration amount of the support body exceeds a preset threshold, the input current of the first magnet, the second magnet, the third magnet and the fourth magnet is adjusted to compensate for the electromagnetic force between the first magnet and the second magnet or the third magnet and the fourth magnet, so that the vibration amount of the support body is reduced below the threshold.

Images