Wind turbine generator experimental device

Abstract

The utility model provides a wind turbine generator experimental device, relates to the technical field of wind power equipment, and is used for solving the problem that a final experimental result and real data have a large deviation due to the fact that a wind turbine generator experimental device and a wind turbine generator for production have a large difference in work in related technologies. The experimental device comprises a driving motor, and a reduction gear box, a first torque sensor, a step-up gear box and a second torque sensor which are connected in sequence, and a doubly-fed generator. The driving motor is configured to be electrically connected with a power grid and powered by the power grid; the input end of the reduction gear box is connected with the output end of the driving motor; the input end of the doubly-fed generator is connected with the free end of the second torque sensor, and the output end of the doubly-fed generator is electrically connected with the power grid through a back-to-back converter.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power equipment, in particular to a wind turbine unit experimental device. Background Art

[0002] With the continuous growth of green energy utilization, the scale of wind turbines, which are equipment for converting wind energy into electrical energy, is also increasing. At the same time, the problems exposed by wind turbines during operation are becoming more and more prominent.

[0003] Most mechanical failures of wind turbines are mainly concentrated in the gearbox and other parts of the transmission system. When the gearbox fails, the generator set will be shut down for a long time, and the operation and maintenance costs will also increase significantly.

[0004] At present, the wind turbine test device used to simulate the working state of the wind turbine usually includes a driving motor, a gearbox and a load connected in sequence, and then uses a torque sensor and an acceleration sensor to measure the torque input or output of the gearbox and the shell vibration respectively, so as to obtain relevant data for simulation analysis and detection of gearbox failures in the wind turbine test device. However, after the output end of the gearbox is connected to the load, it directly consumes the energy of rotation, resulting in energy waste; and this method is very different from the working of the wind turbine used in the production process, which makes it difficult to effectively simulate the real use scenario of the wind turbine, and it is easy to cause a large deviation between the simulated data and the real data, which affects the verification of the experimental results. Utility Model Content

[0005] The utility model aims to provide a wind turbine experimental device, which is used to improve the problem that there is a large deviation between the final experimental result and the real data due to the large difference between the working conditions of the wind turbine experimental device and the production wind turbine in the related technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A wind turbine experimental device is provided, comprising: a driving motor, a reduction gearbox, a first torque sensor, a speed increasing gearbox, a second torque sensor connected in sequence, and a doubly fed generator. The driving motor is configured to be electrically connected to a power grid and powered by the power grid; the input end of the reduction gearbox is connected to the output end of the driving motor; the input end of the doubly fed generator is connected to the free end of the second torque sensor, and the output end of the doubly fed generator is electrically connected to the power grid through a back-to-back converter.

[0008] In some embodiments, the drive motor includes an asynchronous motor, and the asynchronous motor is electrically connected to the power grid via a frequency converter.

[0009] In some embodiments, at least one of the drive motor and the reduction gearbox, the reduction gearbox and the first torque sensor, the first torque sensor and the speed-increasing gearbox, the speed-increasing gearbox and the second torque sensor, and the second torque sensor and the doubly fed generator is connected by a coupling.

[0010] In some embodiments, the first torque sensor includes a main shaft and a torque sensing mechanism, the reduction gearbox and the speed increasing gearbox are connected through the main shaft, and the torque sensing mechanism is configured to detect the torque of the main shaft.

[0011] In some embodiments, the speed-increasing gearbox includes a housing, and a first planetary transmission structure, a second planetary transmission structure and a parallel transmission structure arranged in the housing; the first planetary transmission structure has a first end and a second end arranged opposite to each other; the second planetary transmission structure has a third end and a fourth end arranged opposite to each other, and the third end of the second planetary transmission structure is key-connected to the second end of the first planetary transmission structure; the parallel transmission structure has a fifth end and a sixth end arranged opposite to each other, and the fifth end of the parallel transmission structure is key-connected to the fourth end of the second planetary transmission structure; the first end of the first planetary transmission structure serves as the input end of the speed-increasing gearbox, and the sixth end of the parallel transmission structure serves as the output end of the speed-increasing gearbox.

[0012] In some embodiments, the first planetary transmission structure includes a coaxially arranged first ring gear mechanism, a first planet carrier and a first sun gear; the first ring gear mechanism is fixed in the housing, the first planet carrier is located between the first sun gear and the first ring gear mechanism, the first planet carrier includes a first planetary wheel, the first planetary wheel can rotate around its axis, the teeth of the first planetary wheel are respectively meshed with the first inner ring gear of the first ring gear mechanism and the teeth of the first sun gear; the first planet carrier has a first shaft end, the first shaft end rotates synchronously with the first planet carrier, the first sun gear has a second shaft end, the second shaft end rotates synchronously with the first sun gear; the first shaft end is the first end, and the second shaft end is the second end.

[0013] In some embodiments, the second planetary transmission structure includes a coaxially arranged second ring gear mechanism, a second planet carrier and a second sun gear; the second ring gear mechanism is fixed in the housing, the second planet carrier is located between the second sun gear and the second ring gear mechanism, the second planet carrier includes a second planetary gear, the second planetary gear can rotate around its axis, the teeth of the second planetary gear are respectively meshed with the second inner ring gear of the second ring gear mechanism and the teeth of the second sun gear; the second planet carrier has a third shaft end, the third shaft end rotates synchronously with the second planet carrier, the second sun gear has a fourth shaft end, the fourth shaft end rotates synchronously with the second sun gear; the third shaft end is the third end, and the fourth shaft end is the fourth end.

[0014] In some embodiments, the parallel transmission structure includes a first gear and a second gear arranged side by side, the first gear and the second gear are meshed with each other and have different numbers of teeth; the first gear has a fifth shaft end, the fifth shaft end rotates synchronously with the first gear, the second gear has a sixth shaft end, the sixth shaft end rotates synchronously with the second gear, the fifth shaft end is the fifth end, and the sixth shaft end is the sixth end.

[0015] In some embodiments, the number of teeth on the first gear is smaller than the number of teeth on the second gear.

[0016] In some embodiments, the housing includes a mounting seat and a shell, the mounting seat and the shell together define a chamber to accommodate the first planetary transmission structure, the second planetary transmission structure and the parallel transmission structure; the first planetary transmission structure is partially located on the mounting seat, the second planetary transmission structure is entirely located on the mounting seat, and the parallel transmission structure is located on one side of the mounting seat.

[0017] Beneficial effects:

[0018] For the above-mentioned wind turbine experimental device, the electric energy of the power grid is converted into mechanical energy through the drive motor. The drive motor and the reduction gearbox together are equivalent to the impeller of the production wind turbine, so as to realize the driving of the subsequent speed-increasing gearbox. Afterwards, the electric energy converted from the mechanical energy can be transmitted to the power grid through the doubly fed generator and the back-to-back converter, so as to realize the electric power closed loop of the wind turbine experimental device, so as to simulate the working state of the production wind turbine in the actual operation process more realistically and effectively. In addition, the first torque sensor and the second torque sensor are used to measure the torque and speed at the input and output ends of the speed-increasing gearbox respectively, and the operating state of the speed-increasing gearbox under different faults (for example, the bearing failure in the gearbox, or the broken teeth or wear in the gearbox) can also be simulated, which is conducive to accurately finding the fault when the speed-increasing gearbox of the production wind turbine fails, and reducing the operation and maintenance cost of the production wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic structural diagram of a wind turbine experimental device provided in some embodiments of the present disclosure;

[0021] Figure 2 A cross-sectional view of a speed increasing gearbox provided for some embodiments of the present disclosure;

[0022] Figure 3 A cross-sectional view of a first planetary transmission structure provided for some embodiments of the present disclosure;

[0023] Figure 4 A cross-sectional view of a second planetary transmission structure provided for some embodiments of the present disclosure;

[0024] Figure 5 A cross-sectional view of a parallel transmission structure provided for some embodiments of the present disclosure. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the present disclosure claimed for protection, but merely represents selected embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "some embodiments", "some examples" or "exemplary" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the utility model. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0029] In the description of the present disclosure, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0030] In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. The term "A and / or B" includes the following combinations: only A, only B, or A and B. In the description of the present disclosure, C and D rotate relative to each other, which can mean that C is stationary while D rotates, or C rotates while D is stationary.

[0031] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements. In addition, "fixed" can be a direct connection fixation, or an indirect fixation through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0032] In the related art, a wind turbine test device used to simulate the working state of a wind turbine usually includes a driving motor, a gearbox and a load connected in sequence, and then uses a torque sensor to measure the torque input or output of the gearbox, so as to obtain relevant data for simulation analysis and detection of gearbox failures in the wind turbine test device. However, after the output end of the gearbox is connected to the load, it directly consumes the energy of rotation, resulting in energy waste; and this method is very different from the working state of the wind turbine used in the production process, making it difficult to effectively simulate the actual use scenario of the wind turbine, and it is easy to cause a large deviation between the model data and the actual data, which affects the verification of the experimental results.

[0033] Based on this, some embodiments of the present disclosure provide a wind turbine experimental device, such as Figure 1 As shown, the wind turbine experimental device includes: a driving motor, a reduction gearbox 300 connected in sequence, a first torque sensor 91, a speed increasing gearbox 100, a second torque sensor 92, and a double-fed generator 400.

[0034] The drive motor is configured to be electrically connected to the power grid 600 and powered by the power grid 600. After being powered by the power grid 600, the drive motor can convert electrical energy into kinetic energy, so that its output end rotates.

[0035] The input end of the reduction gearbox 300 is connected to the output end of the driving motor, so that the transmission between the driving motor and the reduction gearbox 300 can be realized. Since the reduction gearbox 300, the first torque sensor 91, the speed-increasing gearbox 100 and the second torque sensor 92 are connected in sequence, the rotation output by the reduction gearbox 300 can be transmitted to the second torque sensor 92, so that the free end of the second torque sensor 92 (i.e., the end of the second torque sensor 92 away from the speed-increasing gearbox 100) is transmitted.

[0036] The input end of the doubly-fed generator 400 is connected to the free end of the second torque sensor 92, and the output end of the doubly-fed generator 40 is electrically connected to the power grid 600 through the back-to-back converter 500. In this way, the doubly-fed generator 40 and the back-to-back converter 500 can be used to convert kinetic energy into electrical energy and then be incorporated into the power grid 600, thereby realizing energy recovery and utilization.

[0037] For the above-mentioned wind turbine experimental device, the electric energy of the grid 600 is converted into mechanical energy through the driving motor, and the driving motor and the reduction gearbox together are equivalent to the impeller of the production wind turbine, thereby realizing the driving of the subsequent speed-increasing gearbox 100. Afterwards, the electric energy converted from the mechanical energy can be transmitted to the grid through the doubly-fed generator 400 and the back-to-back converter 500, thus realizing the electric power closed loop of the wind turbine experimental device, so as to more realistically and effectively simulate the working state of the production wind turbine in the actual operation process.

[0038] More specifically, the drive motor and the reduction gearbox can simulate the impeller of the production wind turbine, and then the actual input torque and speed of the speed-increasing gearbox 100 can be measured by the first torque sensor 91, thereby effectively simulating the load and speed of the impeller input main shaft. The second torque sensor 92 can be used to measure the actual output torque and speed of the speed-increasing gearbox 100, so as to monitor the operating state of the speed-increasing gearbox 100. In addition, the doubly-fed generator 400 and the back-to-back converter 500 can simulate the instantaneous change of the load of the production wind turbine. Therefore, the above-mentioned wind turbine experimental device can effectively simulate the working state of the production wind turbine.

[0039] On the other hand, the first torque sensor 91 and the second torque sensor 92 are used to measure the torque and speed at the input and output ends of the speed-increasing gearbox 100 respectively, and the operating state of the speed-increasing gearbox 100 under different faults (for example, a bearing failure in the gearbox, or broken teeth or wear in the gearbox) can also be simulated.

[0040] In some examples, the speed-increasing gearbox in the wind turbine experimental device and the speed-increasing gearbox used in the production wind turbine have the same structure and speed-increasing ratio, but the size is changed to meet the experimental requirements. Therefore, by simulating different faults, it is helpful to accurately find the fault of the speed-increasing gearbox of the production wind turbine when it fails, and reduce the operation and maintenance cost of the production wind turbine.

[0041] In some examples, such as Figure 1 As shown, the output end of the driving motor and the input end of the reduction gear box 300 can be connected through the first coupling 81, so as to achieve stable transmission between the driving motor and the reduction gear box 300.

[0042] In some examples, the output end of the reduction gearbox 300 and the access end of the first torque sensor 91 (the opposite end of the first torque sensor 91) can be connected through the second coupling 82, thereby achieving stable transmission between the reduction gearbox 300 and the first torque sensor 91.

[0043] In some examples, the free end of the first torque sensor 91 (the other end opposite to the first torque sensor 91) and the input end of the speed-increasing gearbox 100 can be connected via a third coupling 83, thereby achieving stable transmission between the first torque sensor 91 and the speed-increasing gearbox 100.

[0044] In some examples, the output end of the speed increasing gearbox 100 and the access end of the second torque sensor 92 (the opposite end of the second torque sensor 92) can be connected through the fourth coupling 84, thereby achieving stable transmission between the speed increasing gearbox 100 and the second torque sensor 92.

[0045] In some examples, the free end of the second torque sensor 92 (the other end opposite to the second torque sensor 92 ) and the input end of the doubly fed generator 400 may be connected via a fifth coupling 85 , thereby achieving stable transmission between the second torque sensor 92 and the doubly fed generator 400 .

[0046] In some embodiments, Figure 1 As shown, the drive motor includes an asynchronous motor 200, and the asynchronous motor 200 is electrically connected to the power grid 600 through a frequency converter 201. The asynchronous motor 200 has the advantages of simple structure, easy use, easy maintenance, high operational reliability, light weight, and low cost, so it is beneficial to save the cost of the wind turbine experimental device and improve the overall operation stability. In addition, the speed of the output end of the asynchronous motor 200 can also be adjusted, which is beneficial to simulate the speed input by the double-fed generator 400 under different wind conditions. Therefore, the frequency converter 201, the asynchronous motor 200 and the reduction gearbox 300 can be used together as the impeller of the production wind turbine; in this way, the mechanical torque change of the impeller input main shaft under random wind speed can be simulated, that is, the wind energy input situation can be effectively simulated.

[0047] Exemplarily, the asynchronous motor 200 may be a three-phase asynchronous motor, and the inverter 201 may be a vector inverter.

[0048] In some embodiments, the doubly-fed generator 400 may include an excitation frequency converter. The variable speed operation of the doubly-fed generator can be achieved by applying a three-phase low-frequency alternating current to the motor rotor winding through the excitation frequency converter. By adjusting the frequency of the excitation current, the output frequency on the stator side can be ensured to remain constant; by using vector control technology, the amplitude and phase of the excitation current can be adjusted to ensure that the control of the active power and reactive power on the stator side does not interfere with each other.

[0049] The back-to-back converter can transmit the electric energy generated by the doubly-fed generator 400 to the power grid 600, thereby realizing effective energy recovery.

[0050] In some examples, such as Figure 1 As shown, the reduction gearbox 300 has the same structure as the speed-increasing gearbox 100, the input ends of the reduction gearbox 300 and the speed-increasing gearbox 100 are opposite, and the output ends of the reduction gearbox 300 and the speed-increasing gearbox 100 are opposite. That is, the input end of the reduction gearbox 300 can be used as the output end of the speed-increasing gearbox 100, and the output end of the reduction gearbox 300 is used as the input end of the speed-increasing gearbox 100. In this way, when the speed-increasing gearbox 100 needs to be replaced due to internal faults, the corresponding components in the reduction gearbox 300 can be used to replace the faulty components in the speed-increasing gearbox 100, thereby ensuring the continued normal use of the speed-increasing gearbox 100. In addition, the first torque sensor 91 can detect the torque and speed output by the reduction gearbox 300 and other data, which can be used for comparison. By comparison, the fault characteristics of the speed-increasing gearbox 100 can be highlighted.

[0051] In some embodiments, the first torque sensor 91 includes a main shaft, through which the reduction gearbox 300 and the speed increasing gearbox 100 are connected, and a torque sensing mechanism, and the torque sensing mechanism is configured to detect the torque of the main shaft.

[0052] In this way, the torque sensor mechanism is used to measure the torque and other data of the spindle, so that the running state of the spindle when it fails and under different failures can be simulated, thereby realizing the simulation of the spindle failure.

[0053] For example, the main shaft can be a low-speed bearing. In this way, the reduction gear box 300 can be used to ensure the stability of the low-speed bearing.

[0054] In the related art, the speed increasing gearbox of the production wind turbine is usually a multi-stage transmission gearbox. The inventor of the utility model has found that the multi-stage transmission gearbox often has a multi-stage coupling modulation phenomenon during operation. That is, when the first-stage transmission structure fails, its meshing frequency will change periodically, and this change will also have a certain impact on the meshing frequency of the transmission structure of the subsequent transmission connection (such as the second-stage transmission structure and the third-stage transmission structure). In order to reproduce the multi-stage coupling modulation phenomenon, such as Figure 2 As shown, the speed increasing gearbox 100 comprises: a housing 40 and a first planetary transmission structure 10 , a second planetary transmission structure 20 and a parallel transmission structure 30 arranged in the housing.

[0055] The first planetary transmission structure 10 has a first end 11 and a second end 12 that are arranged oppositely; the second planetary transmission structure 20 has a third end 21 and a fourth end 22 that are arranged oppositely, and the third end 21 of the second planetary transmission structure 20 is key-connected with the second end 12 of the first planetary transmission structure 10. In this way, by key-connecting the third end 21 and the second end 12, the transmission connection between the first planetary transmission structure 10 and the second planetary transmission structure 20 can be achieved.

[0056] The parallel transmission structure 30 has a fifth end 31 and a sixth end 32 which are arranged opposite to each other, and the fifth end 31 of the parallel transmission structure 30 is key-connected with the fourth end 22 of the second planetary transmission mechanism 20. In this way, the transmission connection between the second planetary transmission mechanism 20 and the parallel transmission structure 30 can be achieved by key-connecting the fifth end 31 and the fourth end 22.

[0057] The first end 11 of the first planetary transmission structure 10 is used as an input end, and the sixth end 32 of the parallel transmission structure 30 is used as an output end.

[0058] For the above-mentioned speed increasing gearbox 100, since it has a first planetary transmission structure 10, a second planetary transmission structure 20 and a parallel transmission structure 30 connected in sequence, a wind power experiment can be carried out on the speed increasing gearbox with two planetary transmission structures and one parallel transmission structure, so that the multi-stage coupling modulation phenomenon occurring during the operation of the two planetary transmission structures and one parallel transmission structure can be reproduced through the speed increasing gearbox, which is conducive to studying the multi-stage coupling modulation phenomenon. By studying the multi-stage coupling modulation phenomenon, it is helpful to find out the problem in time and accurately when a production wind turbine fails, thereby improving the production efficiency of the wind turbine.

[0059] In addition, since the first planetary transmission structure 10 and the second planetary transmission structure 20 as well as the second planetary transmission structure 20 and the parallel transmission structure 30 are respectively key-connected, on the one hand, motion and torque can be transmitted; on the other hand, the problem of introducing other connecting components that leads to an increase in the size of the speed-increasing gearbox and difficulty in reproducing the multi-stage coupling modulation phenomenon can be avoided, thereby ensuring the compactness and stability of the overall structure of the speed-increasing gearbox.

[0060] In some embodiments, Figure 2 As shown, the second end 12 of the first planetary transmission structure 10 and the third end 21 of the second planetary transmission structure 20 are connected by a first spline transmission. Since the spline usually has multiple teeth, it has a high load-bearing capacity, good centering and guiding properties; the spline tooth root is shallow, the stress concentration is small, and the strength weakening of the connection end is small. Such a setting is conducive to ensuring the connection stability between the second end 12 and the third end 21, and avoiding the weakening of the strength of the second end 12 and the third end 21 by the transmission connection.

[0061] Exemplarily, one of the second end 12 and the third end 21 has a key tooth surrounding its circumference, and the other has a key groove surrounding its circumference, and the key tooth is embedded in the corresponding key groove to form a transmission connection between the first planetary transmission structure 10 and the second planetary transmission structure 20.

[0062] In some embodiments, Figure 2 As shown, the fourth end 22 of the second planetary transmission structure 20 and the fifth end 31 of the parallel transmission structure 30 are connected by a second spline transmission. The structure and setting of the second spline can be designed with reference to the structure and setting of the first spline, and the effect is roughly the same. In this way, it is beneficial to ensure the connection stability between the fourth end 22 and the fifth end 31, and avoid the weakening of the strength of the fourth end 22 and the fifth end 31 by the transmission connection.

[0063] In some embodiments, Figure 3 As shown, the first planetary transmission structure 10 includes a first ring gear mechanism 13, a first planet carrier 14 and a first sun gear 15 which are coaxially arranged; the first ring gear mechanism 13 is fixed in the housing, the first planet carrier 14 is located in the first sun gear 15 and the first ring gear mechanism 13, and the first planet carrier 13 includes a first planetary gear 141, which can rotate around its axis. Exemplarily, the first planetary gear 141 can be fixed in an appropriate position in the first planet carrier 13 by a first bearing 142, so as to ensure that the first planetary gear 141 can rotate stably. There can be multiple first planetary gears 141, and multiple first planetary gears 141 can be evenly arranged around the first sun gear 15.

[0064] The teeth on the outer periphery of the first planetary gear 141 are respectively meshed with the first inner gear ring of the first gear ring mechanism 13 and the teeth on the outer periphery of the first sun gear 15. In this way, the transmission between the first planetary gear 141 and the first sun gear 15 can be achieved.

[0065] The first planet carrier 14 has a first shaft end, which can drive the first planet carrier 14 to rotate around its axis. The first sun gear 15 has a second shaft end, which can drive the first sun gear 15 to rotate around its axis. The first shaft end of the first planet carrier 14 is the first end 11, and the second shaft end of the first sun gear 15 is the second end 12.

[0066] The transmission ratio between the first sun gear 15 and the first planet carrier 14 is less than 1. When the first shaft end of the first planet carrier 14 is used as the input end, the speed output by the second shaft end of the first sun gear 15 is greater than the speed of the input end.

[0067] In some examples, such as Figure 3As shown, the first planet carrier 14 is installed in the housing through a first bearing assembly. The first bearing assembly may include a first front bearing 143 for fixing the first shaft end at the front side of the first planet carrier 14 and a first rear bearing 144 for fixing the rear side of the first planet carrier 14, which is conducive to improving the stability of the installation of the first planet carrier 14.

[0068] In some embodiments, Figure 4 As shown, the second planetary transmission structure 20 includes a coaxially arranged second ring gear mechanism 23, a second planet carrier 24 and a second sun gear 25; the second ring gear mechanism 23 is fixed in the housing, the second planet carrier 24 is located in the second sun gear 25 and the second ring gear mechanism 23, and the second planet carrier 24 includes a second planetary gear 241, which can rotate around its axis. Exemplarily, the second planetary gear 241 can be fixed in an appropriate position in the second planetary carrier 23 by a second bearing 242, so as to ensure that the second planetary gear 241 can rotate stably. The number of the second planetary gears 241 can be multiple, and the multiple second planetary gears 241 can be evenly arranged around the second sun gear 25.

[0069] The teeth on the outer periphery of the second planetary gear 241 are respectively meshed with the second inner gear ring of the second gear ring mechanism 23 and the teeth on the outer periphery of the second sun gear 25. In this way, the transmission between the second planetary gear 241 and the second sun gear 25 can be achieved.

[0070] The second planetary carrier 24 has a third shaft end, which can drive the second planetary carrier 24 to rotate around its axis. The second sun gear 25 has a fourth shaft end, which can drive the second sun gear 25 to rotate around its axis. The third shaft end of the second planetary carrier 24 is the third end 21, and the fourth shaft end of the second sun gear 25 is the fourth end 22.

[0071] The transmission ratio of the second sun gear 25 to the second planet carrier 24 is less than 1. When the third shaft end of the second planet carrier 24 is used as the input end, the speed output by the fourth shaft end of the second sun gear 25 is greater than the speed of the input end. In this way, both the first planetary transmission structure 10 and the second planetary transmission structure 20 are used to achieve speed increase, which is conducive to achieving a larger speed increase ratio of the speed increase gearbox.

[0072] In some examples, such as Figure 4 As shown, the second planet carrier 24 is installed in the housing through a second bearing assembly. The second bearing assembly may include a second front bearing 243 for fixing the first shaft end at the front side of the second planet carrier 24 and a second rear bearing 244 for fixing the rear side of the second planet carrier 24, which is conducive to improving the stability of the installation of the second planet carrier 24.

[0073] In some embodiments, Figure 5As shown, the parallel transmission structure 30 includes a first gear 33 and a second gear 34 arranged side by side. The first gear 33 and the second gear 34 are meshed with each other and have different numbers of teeth.

[0074] The first gear 33 has a fifth shaft end, which can drive the first gear 33 to rotate around its axis. The second gear 34 has a sixth shaft end, which can drive the second gear 34 to rotate around its axis. The fifth shaft end of the first gear 33 is the fifth end 31, and the sixth shaft end of the second gear 34 is the sixth end 32.

[0075] In some examples, the first gear 33 is fixed in the housing by a third bearing assembly. Exemplarily, the third bearing assembly includes a third front bearing 331 and a third rear bearing 332 located on both sides of the first gear 33. Similarly, the second gear 34 is fixed in the housing by a fourth bearing assembly. Exemplarily, the fourth bearing assembly includes a fourth front bearing 341 and a fourth rear bearing 342 located on both sides of the second gear 34.

[0076] In some embodiments, the number of teeth of the first gear 33 is smaller than the number of teeth of the second gear 34. Thus, the transmission ratio of the first gear 33 to the second gear 34 is smaller than 1. In this case, the speed output by the sixth end 32 is greater than the speed input by the fifth end 31.

[0077] Therefore, when the transmission ratios of the first planetary transmission structure 10 , the second planetary transmission structure 20 and the parallel transmission structure 30 in the speed increasing gearbox 100 are consistent, the speed increasing or speed decreasing of the speed increasing gearbox 100 can be better achieved.

[0078] It should be noted that the above-mentioned gear may include a toothed ring gear and a rotating shaft coaxially connected to the ring gear, and its specific structure can be flexibly arranged according to needs.

[0079] Analysis of the kinematic relationship of the gears shows that when a local fault occurs in the second ring gear mechanism in the second planetary transmission mechanism (hereinafter referred to as the second-stage mechanism), the fault at the second ring gear mechanism will cause the second planetary gear and the second sun gear in the second planetary carrier to fluctuate at the characteristic frequency of the ring gear fault, and the first gear in the parallel transmission structure coaxial with the second sun gear (hereinafter referred to as the third-stage mechanism) will also fluctuate at the same frequency, thereby forming a phenomenon in which the meshing frequency of the third-stage mechanism is modulated by the characteristic frequency of the ring gear fault of the second-stage mechanism. Although the third-stage mechanism has no fault, the third-stage mechanism has a "virtual fault" due to the transmission of the characteristic frequency of the ring gear fault. Similarly, when a fault occurs in the first ring gear mechanism in the first planetary transmission mechanism (hereinafter referred to as the first-stage mechanism), after transmission, the meshing vibration of the second-stage mechanism and the third-stage mechanism is also modulated by the ring gear fault signal in the first-stage mechanism. Therefore, for the above-mentioned speed-increasing gearbox, it is possible to simulate the faults of the ring gears in the first ring gear mechanism and the second ring gear mechanism, and then use sensors (such as the first torque sensor 91 and the second torque sensor 92 located at both ends of the speed-increasing gearbox 100) to measure the torque input and output of the speed-increasing gearbox 100 and the shell vibration data, so as to establish a coupled vibration model to simulate and analyze the faults in the first ring gear mechanism and the second ring gear mechanism.

[0080] In some examples, the structures of the first torque sensor 91 and the second torque sensor 92 are different.

[0081] Exemplarily, the first torque sensor 91 is a short-range torque sensor, and the second torque sensor 92 is a long-range torque sensor, which is beneficial for improving the accuracy of the test results and saving costs.

[0082] In some embodiments, Figure 2 As shown, the housing 40 includes a mounting seat 41 and a shell, and the mounting seat 41 and the shell together define a chamber to accommodate the first planetary transmission structure 10, the second planetary transmission structure 20 and the parallel transmission structure 30; the first planetary transmission structure 10 is partially located on the mounting seat 41, the second planetary transmission structure 20 is entirely located on the mounting seat 41, and the parallel transmission structure 30 is located on one side of the mounting seat 41.

[0083] Since the first planetary transmission structure 10 and the second planetary transmission structure 20 respectively include a sun gear, a planet carrier, and a ring gear mechanism, etc., compared with the gears included in the parallel transmission structure 30, the first planetary transmission structure 10 and the second planetary transmission structure 20 have a larger overall mass. Therefore, part of the first planetary transmission structure 10 is arranged on the mounting seat 41, which is conducive to balancing the pressure applied by the first planetary transmission structure 10 and the parallel transmission structure 30 on both sides of the mounting seat 41 and the force brought about during the working process, so that the above transmission structure can be carried by the mounting seat 41 and the overall structure balance of the speed increasing gearbox 100 is guaranteed. On the other hand, this also makes the area occupied by the mounting seat 41 as a whole smaller, which is conducive to the placement and fixation of its position, and is also conducive to material saving.

[0084] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that a person skilled in the art can think of within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A wind turbine experimental device, characterized in that: include: A drive motor is configured to be electrically connected to a power grid and to be powered by the power grid; A reduction gearbox, a first torque sensor, a speed-increasing gearbox, and a second torque sensor connected in sequence, wherein the input end of the reduction gearbox is connected to the output end of the drive motor; as well as A double-fed generator, wherein the input end of the double-fed generator is connected to the free end of the second torque sensor, and the output end of the double-fed generator is electrically connected to the power grid through a back-to-back converter.

2. The wind turbine experimental device according to claim 1, characterized in that: The drive motor comprises an asynchronous motor, and the asynchronous motor is electrically connected to the power grid via a frequency converter.

3. The wind turbine experimental device according to claim 1, characterized in that: At least one of the drive motor and the reduction gearbox, the reduction gearbox and the first torque sensor, the first torque sensor and the speed-increasing gearbox, the speed-increasing gearbox and the second torque sensor, and the second torque sensor and the doubly-fed generator is connected via a coupling.

4. The wind turbine experimental device according to claim 1, characterized in that: The first torque sensor includes a main shaft and a torque sensing mechanism, the reduction gearbox and the speed increasing gearbox are connected through the main shaft, and the torque sensing mechanism is configured to detect the torque of the main shaft.

5. The wind turbine experimental device according to any one of claims 1 to 4, characterized in that: The speed-increasing gearbox includes a housing, and a first planetary transmission structure, a second planetary transmission structure and a parallel transmission structure arranged in the housing; the first planetary transmission structure has a first end and a second end arranged opposite to each other; the second planetary transmission structure has a third end and a fourth end arranged opposite to each other, and the third end of the second planetary transmission structure is key-connected with the second end of the first planetary transmission structure; the parallel transmission structure has a fifth end and a sixth end arranged opposite to each other, and the fifth end of the parallel transmission structure is key-connected with the fourth end of the second planetary transmission structure; the first end of the first planetary transmission structure serves as the input end of the speed-increasing gearbox, and the sixth end of the parallel transmission structure serves as the output end of the speed-increasing gearbox.

6. The wind turbine experimental device according to claim 5, characterized in that: The first planetary transmission structure includes a coaxially arranged first ring gear mechanism, a first planet carrier and a first sun gear; the first ring gear mechanism is fixed in the housing, the first planet carrier is located between the first sun gear and the first ring gear mechanism, the first planet carrier includes a first planetary gear, the first planetary gear can rotate around its axis, the teeth of the first planetary gear are respectively meshed with the first inner ring gear of the first ring gear mechanism and the teeth of the first sun gear; the first planet carrier has a first shaft end, the first shaft end rotates synchronously with the first planet carrier, the first sun gear has a second shaft end, the second shaft end rotates synchronously with the first sun gear; the first shaft end is the first end, and the second shaft end is the second end.

7. The wind turbine experimental device according to claim 6, characterized in that: The second planetary transmission structure includes a coaxially arranged second ring gear mechanism, a second planet carrier and a second sun gear; the second ring gear mechanism is fixed in the housing, the second planet carrier is located between the second sun gear and the second ring gear mechanism, the second planet carrier includes a second planetary gear, the second planetary gear can rotate around its axis, the teeth of the second planetary gear are respectively meshed with the second inner ring gear of the second ring gear mechanism and the teeth of the second sun gear; the second planet carrier has a third shaft end, the third shaft end rotates synchronously with the second planet carrier, the second sun gear has a fourth shaft end, the fourth shaft end rotates synchronously with the second sun gear; the third shaft end is the third end, and the fourth shaft end is the fourth end.

8. The wind turbine experimental device according to claim 7, characterized in that: The parallel transmission structure includes a first gear and a second gear arranged side by side, the first gear and the second gear are meshed with each other and have different numbers of teeth; the first gear has a fifth shaft end, the fifth shaft end rotates synchronously with the first gear, the second gear has a sixth shaft end, the sixth shaft end rotates synchronously with the second gear, the fifth shaft end is the fifth end, and the sixth shaft end is the sixth end.

9. The wind turbine experimental device according to claim 8, characterized in that: The number of teeth of the first gear is smaller than the number of teeth of the second gear.

10. The wind turbine experimental device according to claim 5, characterized in that: The housing includes a mounting seat and an outer shell, wherein the mounting seat and the outer shell together define a chamber to accommodate the first planetary transmission structure, the second planetary transmission structure and the parallel transmission structure; the first planetary transmission structure is partially located on the mounting seat, the second planetary transmission structure is entirely located on the mounting seat, and the parallel transmission structure is located on one side of the mounting seat.

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