Gearbox transmission device, design method and wind turbine generator

Abstract

The embodiment of the invention provides a gearbox transmission device, a design method and a wind turbine generator, and belongs to the technical field of wind power generation. The device comprises a transmission main shaft; the connecting end of the main shaft is located in an inner hole of the planet carrier and connected with the planet carrier through an anti-skid mechanism, and the anti-skid mechanism is used for preventing the planet carrier and the transmission main shaft from generating relative sliding; and the locking disc is arranged on the planet carrier in a sleeving manner and is used for generating pre-tightening force, so that the planet carrier is in interference connection with the transmission main shaft. The structure is simple, the meshing length of the transmission main shaft and the planet carrier is short, the torque of the connecting part can be improved, relative sliding of the planet carrier and the transmission main shaft is effectively prevented, and the service life and safety of the fan are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a gearbox transmission device, a design method for a gearbox transmission device and a wind turbine generator set. Background Art

[0002] At present, the transmission chain system in the wind turbine generator set is mainly used to transmit the torque of the wind turbine generator set, and the speed of the impeller is increased to the speed required by the doubly fed generator through the speed-increasing gearbox, so as to realize the conversion of wind energy into mechanical energy and mechanical energy into electrical energy. At present, the commonly used transmission chain system on land is "three-point support", and the main shaft and the gearbox are connected and the torque is transmitted through the locking plate. Among them, the main shaft is matched with the inner hole of the input stage planetary frame of the gearbox, the inner ring of the locking plate is matched with the outer wall of the planetary frame of the gearbox, and the inner ring and outer ring of the locking plate are pre-tightened by bolt fasteners. After tightening, the locking plate causes a slight deformation of the planetary frame journal and forms an interference fit with the outer circle of the main shaft, and the torque transmission between the main shaft and the planetary frame of the gearbox is realized through the interference fit. However, with the increase of the weight and length of the blades, the original connection form of the gearbox locking plate has the problem of slippage between the main shaft and the inner hole of the planetary frame in the actual operation of the unit. In order to reduce the occurrence of slippage, the meshing length of the transmission main shaft and the planetary frame can only be increased, which increases the cost of use. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a gearbox transmission device, a design method and a wind turbine generator set to solve the above-mentioned problem that as the weight and length of the blades increase, the connection form of the original gearbox locking plate causes slippage between the main shaft and the inner hole of the planetary carrier during the actual operation of the unit. In order to reduce the occurrence of slippage, the only way is to increase the meshing length of the transmission main shaft and the planetary carrier, which increases the cost of use.

[0004] In order to achieve the above object, an embodiment of the present invention provides a gearbox transmission device, the device comprising: Transmission spindle; A planet carrier, wherein the connecting end of the transmission main shaft is located in the inner hole of the planet carrier and is connected to each other through an anti-slip mechanism, wherein the anti-slip mechanism is used to prevent the planet carrier and the transmission main shaft from sliding relative to each other; The locking plate is sleeved on the planet carrier and is used to generate a pre-tightening force so that the planet carrier and the transmission main shaft are interference-connected.

[0005] Optionally, the anti-slip mechanism includes: at least one protrusion, disposed at a connection end of the transmission main shaft; At least one groove is arranged in the inner hole of the planet carrier, and the groove is engaged with the corresponding protrusion.

[0006] Optionally, the locking disk comprises: An inner ring, sleeved on the planet carrier; The outer ring is sleeved on the inner ring, and the outer ring and the inner ring are fixed to each other by a plurality of bolts.

[0007] Optionally, the contact surface between the inner ring and the outer ring is an inclined surface.

[0008] Optionally, a plurality of bolts are distributed at intervals on the outer ring.

[0009] On the one hand, the present invention also provides a design method of a gearbox transmission device, which is applied to the above-mentioned gearbox transmission device, and the method comprises: Obtaining a variation range of the size of the anti-slip mechanism and a variation range of the length of the locking disk as constraint conditions; The objective function is constructed based on the torque value between the transmission main shaft and the planet carrier and the length value of the locking plate; The objective function is iteratively optimized using an optimization algorithm, and the size of the anti-slip mechanism and the length of the locking disk are updated until a preset number of iterations is reached, and the size information of the anti-slip mechanism corresponding to the shortest locking disk length when the output torque is maximum is obtained.

[0010] Optionally, the optimization algorithm includes one of a genetic algorithm, a particle swarm optimization algorithm and an ant colony algorithm.

[0011] Optionally, the anti-slip mechanism includes at least one protrusion and at least one groove, and the dimensions of the anti-slip mechanism include: the number, length, width and height of the protrusions and the number, length, width and depth of the grooves.

[0012] Optionally, the torque value between the transmission main shaft and the planet carrier is calculated by CAE software.

[0013] On the other hand, the present invention further provides a wind turbine generator set, comprising the above-mentioned gear box transmission device.

[0014] The technical solution has a simple structure, can reduce the meshing length between the transmission main shaft and the planetary carrier, reduce manufacturing costs, and can increase the torque of the connection part, effectively preventing relative sliding between the planetary carrier and the transmission main shaft, thereby ensuring the service life and safety of the fan.

[0015] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1It is a schematic cross-sectional structure diagram of the gearbox transmission device provided by the present invention; Figure 2 It is a structural schematic diagram of the connection part between the transmission main shaft and the planet carrier provided by the present invention; Figure 3 It is a flow chart of the design method of the gearbox transmission device provided by the present invention.

[0017] Description of Reference Numerals 1- transmission main shaft; 2- planetary carrier; 3- anti-slip mechanism; 4-locking disc; 31-protrusion; 32-groove; 41-inner ring; 42-outer ring; 43-bolt. DETAILED DESCRIPTION

[0018] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0019] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the inventive product is usually placed when in use.

[0020] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0021] The terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0022] The terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal, vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Figure 1 It is a schematic cross-sectional structure diagram of the gearbox transmission device provided by the present invention; Figure 2 It is a structural schematic diagram of the connection part between the transmission main shaft and the planet carrier provided by the present invention; Figure 3 It is a flow chart of the design method of the gearbox transmission device provided by the present invention.

[0026] like Figure 1-2 As shown, this embodiment provides a gearbox transmission device, the device comprising: Transmission spindle 1; A planet carrier 2, wherein the connecting end of the transmission main shaft 1 is located in the inner hole of the planet carrier 2 and is connected to each other via an anti-slip mechanism 3, wherein the anti-slip mechanism 3 is used to prevent the planet carrier 2 and the transmission main shaft 1 from sliding relative to each other; The locking plate 4 is sleeved on the planet carrier 2 and is used to generate a pre-tightening force so that the planet carrier 2 and the transmission main shaft 1 are interference-connected.

[0027] Specifically, the planetary carrier 2 is a key component in the gearbox, generally a casting, which is used for the transmission main shaft 1 and transmits the mechanical energy transmitted by the transmission main shaft 1 to the inside of the gearbox, and then the gearbox transmits it backward after speeding up or slowing down; the locking plate 4 is sleeved on the planetary carrier 2, and is used to generate a preload force to make the planetary carrier 2 and the transmission main shaft 1 interference connected, and combined with the anti-skid mechanism 3, there is no relative sliding between the planetary carrier 2 and the transmission main shaft 1, reducing the risk of main slip. The transmission main shaft 1 and the planetary carrier 2 are connected by the anti-skid mechanism 3, and can pass the idling test during the initial assembly, thereby improving the reliability of the assembly, reducing the interference caused by the gap between the transmission main shaft 1 and the planetary carrier 2 due to assembly problems in the original structure, improving the ability of the transmission chain to transmit torque, and effectively reducing the meshing length of the transmission main shaft 1 and the planetary carrier 2, saving materials, reducing the cost of the transmission chain system, improving the reliability of the transmission chain system, and solving the problem of transmission chain system slippage. Effectively ensure the execution of single-blade lifting and ensure the normal operation of the wind turbine generator set.

[0028] Furthermore, the anti-slip mechanism 3 comprises: At least one protrusion 31 is provided at the connecting end of the transmission main shaft 1; At least one groove 32 is disposed in the inner hole of the planet carrier 2 , and the groove 32 and the corresponding protrusion 31 are engaged with each other.

[0029] Specifically, in this embodiment, by providing a protrusion 31 at the connection end of the transmission main shaft 1 and providing a groove 32 in the inner hole of the planet carrier 2, the corresponding groove 32 and the corresponding protrusion 31 are engaged with each other to increase the torque transmission capacity, avoid the transmission main shaft 1 and the planet carrier 2 from slipping, ensure the stability of the connection, and reduce the difficulty of assembly; in addition, the number of protrusions 31 and grooves 32 is the same, and the specific number is determined by actual use requirements. More specifically, the anti-slip mechanism 3 can adopt a spline structure.

[0030] Preferably, the protrusion 31 and the groove 32 can be arranged in an isosceles trapezoidal structure.

[0031] Furthermore, the locking disk 4 comprises: An inner ring 41 is sleeved on the planet carrier 2; The outer ring 42 is sleeved on the inner ring 41 , and the outer ring 42 and the inner ring 41 are fixed to each other by a plurality of bolts 43 .

[0032] Specifically, in this embodiment, the end face of the inner ring 41 is flush with the end face of the outer ring 42 or the end face of the inner ring 41 is slightly higher than the end face of the outer ring 42, so that after the bolts 43 are installed, the inner ring 41 and the outer ring 42 can be fixed to each other.

[0033] Furthermore, the contact surface between the inner ring 41 and the outer ring 42 is an inclined surface.

[0034] Specifically, the contact surface between the inner ring 41 and the outer ring 42 is set as an inclined surface, so that after tightening the bolt 43, the nut of the bolt 43 will press the surface of the inner ring 41, thereby generating an inward extrusion force, so that the inner ring 41 presses the planetary carrier 2 and achieves an interference connection with the transmission main shaft 1.

[0035] Furthermore, a plurality of bolts 43 are distributed at intervals on the outer ring 42 .

[0036] Specifically, in this embodiment, a plurality of bolts 43 are distributed at intervals on the outer ring 42, which can ensure that the force on the connection parts is more uniform, ensure the structural strength, and improve the service life.

[0037] like Figure 1-2 As shown, this embodiment provides a design method for a gearbox transmission device, which is applied to the above-mentioned gearbox transmission device, and the method includes: Step 1: Obtain the variation range of the size of the anti-slip mechanism and the variation range of the length of the locking disk as constraint conditions; Step 2: construct an objective function based on the torque value between the transmission main shaft and the planet carrier and the length value of the locking plate; Step 3: Iteratively optimize the objective function using an optimization algorithm, and update the size of the anti-slip mechanism and the length of the locking disk until the preset number of iterations is reached, and the size information of the anti-slip mechanism corresponding to the shortest locking disk length when the output torque is maximum.

[0038] Specifically, in the present embodiment, firstly, according to the structural parameters such as the outer dimensions of the gearbox transmission device, the structure is simplified by using modeling software such as CAD to obtain the structural model of the gearbox transmission device, and, according to the design requirements, the variable range of the size of the anti-slip mechanism and the variable range of the length of the locking disk in the structural model of the gearbox transmission device can be determined. However, since the changes in the size of the anti-slip mechanism and the length of the locking disk will affect the final torque value, it is necessary to determine an optimal size of the anti-slip mechanism and an optimal length of the locking disk within the variable range of the size of the anti-slip mechanism and the variable range of the length of the locking disk. Therefore, an objective function is constructed with the torque value between the transmission main shaft and the planetary carrier and the length value of the locking disk, and the variation range of the size of the anti-slip mechanism and the variation range of the length of the locking disk are used as constraints. The objective function is iteratively optimized by using an optimization algorithm, and the size of the anti-slip mechanism and the length of the locking disk are updated until the preset number of iterations is reached, and the size information of the anti-slip mechanism corresponding to the shortest length of the locking disk when the output torque is maximum is obtained.

[0039] More specifically, under different locking disk lengths, there may still be a maximum output torque value that is the same. However, the longer the locking disk length, the higher the corresponding preparation cost. Therefore, when the maximum torque corresponds to multiple locking disks of different lengths, the dimensional information of the anti-slip mechanism corresponding to the shortest locking disk length is selected as the final design result for production and preparation.

[0040] Furthermore, the optimization algorithm includes one of a genetic algorithm, a particle swarm optimization algorithm and an ant colony algorithm.

[0041] Specifically, genetic algorithm, particle swarm optimization algorithm and ant colony algorithm are used to perform iterative update calculation, which is simple in calculation and more accurate in result.

[0042] Furthermore, the anti-slip mechanism comprises at least one protrusion and at least one groove, and the dimensions of the anti-slip mechanism comprise: the number, length, width and height of the protrusions and the number, length, width and depth of the grooves.

[0043] Specifically, in actual use, due to different combinations of the number, length, width, and depth of the protrusions and grooves, the torque values ​​between the corresponding transmission main shaft and the planetary carrier are all different. Therefore, in actual use, in order to determine the optimal size parameters (that is, the maximum torque value that can be achieved under similar structures), it can effectively ensure that the use requirements are met during use and avoid damage caused by different torque values. Therefore, in this embodiment, by taking the number, length, width, depth of the protrusions and grooves, and the length of the locking plate as the variation, iterative optimization is performed, and the size design with the maximum torque value and the lowest manufacturing cost is selected for manufacturing and assembly.

[0044] Furthermore, the torque value between the transmission main shaft and the planetary carrier is calculated by CAE software.

[0045] Specifically, through the above-mentioned algorithm, after each iterative update, a corresponding anti-slip mechanism size and locking disk length can be obtained. At this time, the structural model of the gearbox transmission device is updated based on the preliminary anti-slip mechanism size and locking disk length. After the update is completed, the CAE software platform is called to import the updated structural model of the gearbox transmission device into the CAE software platform to calculate the torque value, thereby obtaining the torque value corresponding to the anti-slip mechanism size and locking disk length.

[0046] Specifically, CAE is the abbreviation of Computer Aided Engineering. It is an approximate numerical analysis method that uses computers to solve the analysis and calculation of mechanical properties such as strength, stiffness, buckling stability, dynamic response, heat conduction, three-dimensional multi-body contact, elastic-plasticity, and optimization design of structural performance of complex engineering and products. CAE software can be divided into two categories: software developed for specific types of engineering or products for product performance analysis, prediction and optimization, called dedicated CAE software; software that can analyze, simulate, predict, evaluate and optimize the physical and mechanical properties of various types of engineering and products to achieve product technology innovation, called general CAE software. The main body of CAE software is finite element analysis (FEA, Finite Element Analysis) software. The basic idea of ​​the finite element method is to discretize the structure, use a finite number of easy-to-analyze units to represent complex objects, connect the units with a finite number of nodes, and then comprehensively solve according to the deformation coordination conditions. Since the number of units is limited, the number of nodes is also limited, so it is called the finite element method. This method is very flexible. As long as the number of units is changed, the accuracy of the solution can be changed, and a solution that is infinitely close to the actual situation can be obtained. The core idea of ​​CAE system based on finite element method is the discretization of structure.

[0047] This embodiment also provides a wind turbine generator set, including the above-mentioned gear box transmission device.

[0048] Specifically, in this embodiment, the transmission main shaft 1 is connected to the fan blades of the wind turbine set to transmit the rotational speed of the fan blades, and the planetary carrier 2 is connected to the transmission main shaft 1 through the anti-slip mechanism 3 to transmit the drilling speed of the wind turbine set to the gear box to realize the transmission of mechanical energy, which is then increased by the gear box and transmitted to the generator for power generation.

[0049] More specifically, after the optimal design result is determined by the above method, production and preparation are carried out according to the optimal design result; then the inner ring, outer ring, bolts and other fasteners are installed to the outer surface of the planetary carrier; the transmission main shaft is installed to the inner hole of the planetary carrier, and it is ensured that the protrusions and grooves are engaged normally; the bolts and other fasteners are pre-tightened according to the torque requirements.

[0050] During the assembly process of the wind turbine generator set, it is necessary to align the center to ensure the effective meshing of the transmission main shaft and the planetary carrier. After the assembly is completed, the transmission chain is idled to ensure that the meshing of the transmission main shaft and the planetary carrier is smooth and without abnormal noise; then the bolts of the locking plate are tightened with torque to ensure that the end faces of the inner ring and the outer ring are flush and the bolts meet the torque requirements.

[0051] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0053] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a single-chip microcomputer, a chip or a processor (processor) perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0054] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A gearbox transmission device, characterized in that: The device comprises: Transmission spindle (1); A planet carrier (2), wherein the connection end of the transmission main shaft (1) is located in an inner hole of the planet carrier (2) and is connected to each other via an anti-slip mechanism (3), wherein the anti-slip mechanism (3) is used to prevent the planet carrier (2) and the transmission main shaft (1) from sliding relative to each other; The locking plate (4) is sleeved on the planet carrier (2) and is used to generate a pre-tightening force so that the planet carrier (2) and the transmission main shaft (1) are interference-connected.

2. The gearbox transmission device according to claim 1, characterized in that: The anti-slip mechanism (3) comprises: At least one protrusion (31) is arranged on the connecting end of the transmission main shaft (1); At least one groove (32) is arranged in the inner hole of the planet carrier (2), and the groove (32) and the corresponding protrusion (31) are mutually engaged and connected.

3. The gearbox transmission device according to claim 1, characterized in that: The locking disc (4) comprises: An inner ring (41) sleeved on the planet carrier (2); The outer ring (42) is sleeved on the inner ring (41), and the outer ring (42) and the inner ring (41) are fixed to each other via a plurality of bolts (43).

4. The gearbox transmission device according to claim 3, characterized in that: The contact surface between the inner ring (41) and the outer ring (42) is an inclined surface.

5. The gearbox transmission device according to claim 3, characterized in that: A plurality of bolts (43) are distributed at intervals on the outer ring (42).

6. A method for designing a gearbox transmission device, applied to the gearbox transmission device according to any one of claims 1 to 5, characterized in that: The method comprises: Obtaining a variation range of the size of the anti-slip mechanism and a variation range of the length of the locking disk as constraint conditions; The objective function is constructed based on the torque value between the transmission main shaft and the planet carrier and the length value of the locking plate; The objective function is iteratively optimized using an optimization algorithm, and the size of the anti-slip mechanism and the length of the locking disk are updated until a preset number of iterations is reached, and the size information of the anti-slip mechanism corresponding to the shortest locking disk length when the output torque is maximum is obtained.

7. The design method of the gearbox transmission device according to claim 6, characterized in that: The optimization algorithm includes one of a genetic algorithm, a particle swarm optimization algorithm and an ant colony algorithm.

8. The design method of the gearbox transmission device according to claim 6, characterized in that: The anti-slip mechanism comprises at least one protrusion and at least one groove, and the dimensions of the anti-slip mechanism comprise: the number, length, width and height of the protrusions and the number, length, width and depth of the grooves.

9. The design method of the gearbox transmission device according to claim 6, characterized in that: The torque value between the transmission main shaft and the planetary carrier is calculated by CAE software.

10. A wind turbine generator set, characterized in that: A gearbox transmission device comprising any one of claims 1-5.

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