Connecting structure for main shaft and gear box of wind generating set and using method

Abstract

The invention discloses a connecting structure of a main shaft and a gear box of a wind generating set and a using method, and belongs to the technical field of transmission of wind power generation gear boxes, the connecting structure comprises a fan main shaft and a gear box gear ring, and a primary planet carrier is arranged in the gear box gear ring; an internal spline is arranged at one end of the fan main shaft, an external spline is arranged at one end of the primary planet carrier, and the tooth crest of the internal spline is matched with the tooth root of the external spline; one end, away from the fan spindle, of the primary planet carrier is connected with a secondary planet carrier; a pressing plate is arranged on the side, away from the first-stage planet carrier, of the inner spline of the fan spindle and connected with the first-stage planet carrier, the first-stage planet carrier, the second-stage planet carrier and the pressing plate are provided with communicated lubricating oil ways, and the lubricating oil ways convey lubricating oil to the meshing position of the inner spline and the outer spline. By means of the connecting structure, the torque transmission capacity is greatly improved, and the stability and durability of connection between the main shaft of the generator set and the gearbox are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation gearbox transmission, and in particular relates to a connecting structure between a main shaft and a gearbox of a wind power generator set and a use method thereof. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, for the transmission structure of integrated wind turbines, the main shaft and the first-stage planetary frame of the gearbox are connected by pins and bolts. As the power of the wind turbine increases, a large number of bolts and pins need to be arranged to transmit torque in order to meet the torque transmission capacity, resulting in a bulky transmission structure design, inconvenient disassembly, and increased material costs; and the use of a large number of pin connections requires the main shaft and the planetary frame to have a high processing accuracy to meet the assembly requirements, resulting in increased processing and assembly costs. In addition, large-power units often have insufficient design space for bolts and pins due to the size limitations of the main bearing, and the safety factor of the pin and bolt connection is low. There is a risk of slippage on the joint surface, which poses a hidden danger to the normal operation of the wind turbine. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a connection structure and a use method of a main shaft of a wind turbine generator set and a gearbox. The connection structure of the main shaft of the generator set and the gearbox adopts a spline connection to transmit torque. At the same time, a lubricating oil circuit is designed so that lubricating oil can flow through the spline meshing point to ensure lubrication during the use of the spline connection and flushing of debris generated by meshing wear. An axial positioning structure is provided to ensure accurate and stable connection, thereby greatly improving the torque transmission capacity within the same design space, and solving the problems of complex connection structure, difficult disassembly and high processing cost of the existing front-end integrated transmission chain main shaft and gearbox connection.

[0005] The technical solution of the present invention is as follows:

[0006] In a first aspect of the present invention, a structure for connecting a main shaft of a wind turbine generator set with a gearbox is provided, comprising a main shaft of a wind turbine and a gearbox ring gear, wherein a primary planet carrier is arranged inside the gearbox ring gear; an inner spline is arranged at one end of the main shaft of the wind turbine, an outer spline is arranged at one end of the primary planet carrier, and a tooth top of the inner spline matches a tooth root of the outer spline; an end of the primary planet carrier away from the main shaft of the wind turbine is connected to a secondary planet carrier;

[0007] A pressure plate is provided on the side of the inner spline of the fan main shaft away from the primary planetary carrier, and the pressure plate is connected to the primary planetary carrier. The primary planetary carrier, the secondary planetary carrier and the pressure plate are provided with a connected lubricating oil circuit, and the lubricating oil circuit transports the lubricating oil to the meshing point of the inner spline and the outer spline.

[0008] In some embodiments of the present invention, a bearing seat is further included, wherein the bearing seat is sleeved on the outside of the fan main shaft, and one end of the bearing seat is connected to the gear ring of the gear box; a downwind main bearing is provided at the end of the bearing seat connected to the gear ring of the gear box, and an upwind main bearing is provided at the end away from the downwind main bearing.

[0009] In some embodiments of the present invention, a copper ring is provided at the connection between the secondary planet carrier and the primary planet carrier, and the copper ring is provided with a through hole, and the through hole is connected to the lubricating oil circuit.

[0010] In some embodiments of the present invention, an end cover is provided at an end of the secondary planet carrier close to the primary planet carrier, and the end cover is connected to the primary planet carrier and the secondary planet carrier.

[0011] In some embodiments of the present invention, the pressure plate is a circular structure, and the outer diameter of the pressure plate is matched with the inner diameter of the fan main shaft.

[0012] In some embodiments of the present invention, the pressure plate is connected to the primary planetary carrier via bolts, and a plurality of the bolts are provided.

[0013] In some embodiments of the present invention, a main shaft spline sealing ring is provided on the side of the inner spline of the fan main shaft close to the pressure plate; a planet carrier spline sealing ring is provided on the side of the outer spline of the primary planet carrier close to the pressure plate.

[0014] In some embodiments of the present invention, the main shaft spline sealing ring and the planet carrier spline sealing ring are both O-rings.

[0015] In some embodiments of the present invention, a first boss structure is provided at one end of the fan main shaft close to the first-stage planetary carrier, and a second boss structure is provided at one end of the first-stage planetary carrier close to the fan main shaft; the first boss structure and the second boss structure are adapted to form a positioning boss; the positioning boss is provided with a lubricating oil circuit outlet.

[0016] In a second aspect of the present invention, a method for using a connection structure between a main shaft and a gearbox of a wind turbine generator set is provided, comprising:

[0017] Install the primary planet carrier into the fan main shaft, the inner spline of the fan main shaft matches with the outer spline of the planet carrier, the first boss structure of the fan main shaft and the second boss structure of the primary planet carrier are in close contact, forming a positioning boss to achieve axial positioning;

[0018] A sealing ring is arranged on the inner spline of the fan main shaft and the outer spline of the planet carrier close to the pressure plate, which is pressed by the pressure plate and screwed in with bolts to achieve sealing and connection between the planet carrier and the fan main shaft;

[0019] The secondary planetary carrier is connected to the end of the primary planetary carrier away from the fan main shaft, so that the lubricating oil paths on the secondary planetary carrier, the primary planetary carrier and the pressure plate are connected. The lubricating oil flows through the secondary planetary carrier, the primary planetary carrier and the pressure plate, reaches the meshing point between the inner spline and the outer spline, and flows out from the lubricating oil path outlet on the positioning boss.

[0020] One or more technical solutions of the present invention have the following beneficial effects:

[0021] The present invention provides a wind turbine generator set main shaft and gear box connection structure and a use method thereof. The main shaft and gear box connection structure of the wind turbine generator set is designed to adopt a spline connection to transmit torque. At the same time, a lubricating oil path is designed so that lubricating oil can flow through the spline meshing part to ensure lubrication during the use of the spline connection. An axial positioning structure is provided to ensure accurate and stable connection, thereby greatly improving the torque transmission capacity within the same design space. The connection structure is simple, the number of connecting parts is small, and assembly and disassembly are convenient.

[0022] The connection structure provided by the present invention is provided with lubricating oil passages on the primary planet carrier, the secondary planet carrier and the pressure plate, so that the lubricating oil can continuously flow from one end of the pressure plate near the spline meshing position to one end of the positioning boss and flow out through the positioning boss, which can ensure lubrication during the use of the spline connection and cool down the meshing part, and wash away the wear debris generated by meshing wear, thereby ensuring the stability of the connection and improving the durability of the connection structure;

[0023] The spline connection method has high centering accuracy, improves the rotation accuracy of the transmission system, has strong torque transmission capacity, reliable connection, and reduces the risk of connection failure;

[0024] The axial positioning of the fan main shaft and the planetary carrier is ensured by the pressure plate and the positioning boss, the structure is simple and reliable, and the fan main shaft and the planetary carrier end faces are axially sealed by O-rings, the assembly is simple and the sealing is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 This is a schematic diagram of the overall structure of a connection structure between a main shaft and a gear box of a wind turbine generator set provided in Example 1 of the present invention;

[0027] Figure 2 is a schematic diagram of the connection structure of the pressing plate provided in Example 1 of the present invention;

[0028] Figure 3 is a schematic diagram of the positioning boss connection structure provided in Example 1 of the present invention;

[0029] Figure 4 It is a schematic diagram of the meshing of the internal spline and the external spline provided in Example 1 of the present invention;

[0030] Figure 5 This is a schematic diagram of the lubricating oil circuit provided in Example 1 of the present invention.

[0031] The schematic diagram is for illustrative purposes only;

[0032] Among them, 1. Fan main shaft; 2. Upwind main bearing; 3. Bearing seat; 4. Downwind main bearing; 5. Primary planetary carrier; 6. Gear box ring; 7. Pressure plate; 8. Bolts; 9. Spline seal ring of main shaft; 10. Spline seal ring of planetary carrier; 11. Positioning boss; 12. Secondary planetary carrier; 13. Lubricating oil circuit outlet; 14. Lubricating oil circuit inlet; 15. Copper ring; 16. Matching positioning surface; 17. End cover; 18. Screw plug. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] Example 1

[0035] In a typical embodiment of the present invention, Figure 1 As shown, a connection structure between the main shaft and the gearbox of a wind turbine generator set is provided, comprising a fan main shaft 1 and a gearbox ring gear 6, wherein a primary planet carrier 5 is arranged inside the gearbox ring gear 6; an inner spline is arranged at one end of the fan main shaft 1, and an outer spline is arranged at one end of the primary planet carrier 5, wherein the tooth top of the inner spline matches the tooth root of the outer spline to form a matching positioning surface 16; an end of the primary planet carrier 5 away from the fan main shaft 1 is connected to the secondary planet carrier 12; a pressure plate 7 is arranged at a side of the inner spline of the fan main shaft 1 away from the primary planet carrier 5, and the pressure plate 7 is connected to the primary planet carrier 5, and the primary planet carrier 5, the secondary planet carrier 12 and the pressure plate 7 are provided with a connected lubricating oil path, and the lubricating oil path transports the lubricating oil to the meshing position of the inner spline and the outer spline.

[0036] In this embodiment, one end of the first-stage planetary carrier 5 extends into the interior of the fan main shaft 1 and is matched with a spline. The spline connection method allows the fan main shaft 1 to be connected to the first-stage planetary carrier 5 with high centering accuracy, thereby improving the rotation accuracy of the transmission system, having strong torque transmission capacity, reliable connection, and reducing the risk of connection failure.

[0037] Furthermore, it also includes a bearing seat 3, which is sleeved on the outside of the fan main shaft 1 and one end of which is connected to the gear box ring gear 6. The end of the bearing seat 3 connected to the gear box ring gear 6 is provided with a downwind main bearing 4, and the end away from the downwind main bearing 4 is provided with an upwind main bearing 2.

[0038] Furthermore, a copper ring 15 is provided at the connection between the secondary planetary carrier 12 and the primary planetary carrier 5. The copper ring 15 is provided with a through hole, which is connected to the lubricating oil circuit. An end cover 17 is provided at the end of the secondary planetary carrier 12 close to the primary planetary carrier 5. The end cover 17 is connected to the primary planetary carrier 5 and the secondary planetary carrier 12.

[0039] like Figure 2 As shown, a pressure plate 7 is provided on the side of the inner spline of the fan main shaft 1 away from the primary planetary carrier 5, and the pressure plate 7 is connected to the primary planetary carrier 5. The pressure plate 7 is a circular structure, and the outer diameter of the pressure plate 7 is adapted to the inner diameter of the fan main shaft 1. The pressure plate 7 is connected to the primary planetary carrier 5 by bolts 8, and a plurality of bolts 8 are provided. In this embodiment, a pressure plate 7 is provided on the left side where the inner spline of the fan main shaft 1 cooperates with the outer spline of the primary planetary carrier 5, and the pressure plate 7 is connected to the primary planetary carrier 5 by bolts 8, so that the right side of the pressure plate 7 abuts against the left end faces of the inner spline and the outer spline, and a plurality of bolts 8 are provided at the connection between the pressure plate 7 and the primary planetary carrier, and the number and position are provided for the purpose of ensuring stable connection, while avoiding the lubricating oil path, so as to realize the axial positioning and stable cooperation between the fan main shaft 1 and the primary planetary carrier 5, and prevent axial movement during the transmission of the fan main shaft 1.

[0040] The lubricating oil circuit on the pressing plate 7 is sealed at the bottom, and the upper part is opened to the outside of the pressing plate, and a screw plug 18 is installed. This arrangement facilitates drilling of the oil circuit and installation of the screw plug 18 from the outside of the pressing plate 7. At the same time, the screw plug 18 blocks the oil circuit at the pressing plate 7, further achieving a sealing effect. In addition, the radial dimension of the channel leading to the spline meshing at the right side of the oil circuit of the pressing plate 7 is reduced, which can ensure the outlet pressure of the lubricating oil reaching the spline meshing, and realize the flushing of the wear debris generated during the use of the spline meshing.

[0041] Furthermore, a main shaft spline sealing ring 9 is provided on the side of the inner spline of the fan main shaft 1 close to the pressure plate 7; a planet carrier spline sealing ring 10 is provided on the side of the outer spline of the primary planet carrier 5 close to the pressure plate 7. Both the main shaft spline sealing ring 9 and the planet carrier spline sealing ring 10 are O-type sealing rings.

[0042] In this embodiment, an annular sealing groove is provided on the inner spline of the fan main shaft 1 and the outer spline of the first-stage planetary carrier 5 near the pressure plate 7, and a sealing ring is arranged in the annular sealing groove. Axial sealing is performed by using an O-ring on the end face of the fan main shaft 1 and the first-stage planetary carrier 5 and pressing the sealing ring through the pressure plate 7, which simplifies assembly and improves the sealing performance of the spline connection.

[0043] like Figure 3As shown, a first boss structure is provided at one end of the fan main shaft 1 close to the primary planet carrier 5, and a second boss structure is provided at one end of the primary planet carrier 5 close to the fan main shaft 1. The first boss structure and the second boss structure are adapted to form a positioning boss 11, and the positioning boss 11 is provided with a lubricating oil outlet 13, and the shape of the lubricating oil outlet 13 can be set to a groove structure or a circular structure.

[0044] In this embodiment, a second boss structure is provided at the end face of the first-stage planetary carrier 5 close to the fan main shaft 1. The second boss structure is an annular structure and abuts against the fan main shaft 1. At the same time, a first boss structure is provided at the position where the fan main shaft 1 and the first-stage planetary carrier 5 abut against each other. The first boss structure is also an annular structure. The first boss structure and the second boss structure are adapted to abut against each other to form a positioning boss 11, thereby realizing axial positioning of the fan main shaft 1 and the first-stage planetary carrier 5.

[0045] The present invention provides a method for using a wind turbine generator set main shaft and gearbox connection structure, comprising:

[0046] The primary planet carrier 5 is installed into the fan main shaft 1, the internal splines of the fan main shaft 1 match with the external splines of the primary planet carrier 5, the first boss structure of the fan main shaft 1 and the second boss structure of the primary planet carrier 5 are ensured to be in a tight state, and a positioning boss 11 is formed to achieve axial positioning;

[0047] A main shaft spline sealing ring 9 and a planet carrier spline sealing ring 10 are arranged on the inner spline of the fan main shaft 1 and the outer spline of the primary planet carrier 5 close to the pressure plate 7, and the pressure plate 7 is used to press and tighten the bolt 8 to achieve the sealing and connection between the primary planet carrier 5 and the fan main shaft 1;

[0048] A secondary planetary carrier 12 is connected to the end of the primary planetary carrier 5 away from the fan main shaft 1, so that the lubricating oil paths on the secondary planetary carrier 12, the primary planetary carrier 5 and the pressure plate 7 are connected. The lubricating oil passes through the secondary planetary carrier 12, flows through the primary planetary carrier 5 and the pressure plate 7, reaches the meshing point between the inner spline and the outer spline, and flows out from the lubricating oil path outlet 13 on the positioning boss.

[0049] In this embodiment, the lubricating oil circuit inlet 14 is arranged on the right side of the secondary planetary carrier 12. The lubricating oil enters from the lubricating oil circuit inlet 14, passes through the secondary planetary carrier 12, the copper ring 15, the primary planetary carrier 5, and the pressure plate 7 in sequence, and flows to the spline meshing place, thereby ensuring the lubrication of the spline connection during use, cooling the meshing part, and washing away the wear debris generated by the meshing wear, thereby ensuring the stability of the connection and improving the durability of the connection structure.

[0050] The invention provides a wind turbine generator main shaft and gearbox connection structure, which adopts a spline connection to transmit torque by designing the generator main shaft and gearbox connection structure, and provides an axial positioning structure to ensure accurate and stable connection, thereby greatly improving the torque transmission capacity within the same design space, and has a simple connection structure, fewer connecting parts, and is easy to assemble and disassemble.

[0051] The spline connection method has high centering accuracy, improves the rotation accuracy of the transmission system, has strong torque transmission capacity, reliable connection, and reduces the risk of connection failure;

[0052] The axial positioning of the fan main shaft and the first-stage planetary frame is ensured by the pressure plate and the positioning boss, the structure is simple and reliable, and the fan main shaft and the first-stage planetary frame end faces are axially sealed by O-rings, the assembly is simple, and the sealing is reliable.

[0053] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A connection structure between a main shaft and a gearbox of a wind turbine generator set, characterized in that: It comprises a fan main shaft and a gear box ring gear, wherein a primary planet carrier is arranged in the gear box ring gear; an inner spline is arranged at one end of the fan main shaft, an outer spline is arranged at one end of the primary planet carrier, and the tooth top of the inner spline matches the tooth root of the outer spline; an end of the primary planet carrier away from the fan main shaft is connected to a secondary planet carrier; A pressure plate is provided on the side of the inner spline of the fan main shaft away from the primary planetary carrier, and the pressure plate is connected to the primary planetary carrier. The primary planetary carrier, the secondary planetary carrier and the pressure plate are provided with a connected lubricating oil circuit, and the lubricating oil circuit transports the lubricating oil to the meshing point of the inner spline and the outer spline.

2. A wind turbine generator main shaft and gearbox connection structure as claimed in claim 1, characterized in that: It also includes a bearing seat, which is sleeved on the outside of the fan main shaft, and one end of the bearing seat is connected to the gear ring of the gear box; the end of the bearing seat connected to the gear ring of the gear box is provided with a downwind main bearing, and the end away from the downwind main bearing is provided with an upwind main bearing.

3. A wind turbine generator main shaft and gearbox connection structure as claimed in claim 1, characterized in that: A copper ring is provided at the connection between the secondary planet carrier and the primary planet carrier. The copper ring is provided with a through hole, and the through hole is communicated with the lubricating oil circuit.

4. A wind turbine generator main shaft and gearbox connection structure as claimed in claim 1, characterized in that: An end cover is provided at the end of the secondary planet carrier close to the primary planet carrier, and the end cover is connected to the primary planet carrier and the secondary planet carrier.

5. A wind turbine generator main shaft and gearbox connection structure as claimed in claim 1, characterized in that: The pressing plate is a circular structure, and the outer diameter of the pressing plate is matched with the inner diameter of the fan main shaft.

6. A wind turbine generator main shaft and gearbox connection structure as claimed in claim 1, characterized in that: The pressure plate is connected to the primary planet carrier via bolts, and a plurality of bolts are provided.

7. A wind turbine generator main shaft and gearbox connection structure as claimed in claim 1, characterized in that: A main shaft spline sealing ring is provided on the side of the inner spline of the fan main shaft close to the pressure plate; a planet carrier spline sealing ring is provided on the side of the outer spline of the primary planet carrier close to the pressure plate.

8. A wind turbine generator main shaft and gearbox connection structure as claimed in claim 7, characterized in that: The main shaft spline sealing ring and the planet carrier spline sealing ring are both O-type sealing rings.

9. A wind turbine generator main shaft and gearbox connection structure as claimed in claim 1, characterized in that: A first boss structure is provided at one end of the fan main shaft close to the primary planetary frame, and a second boss structure is provided at one end of the primary planetary frame close to the fan main shaft; the first boss structure and the second boss structure are adapted to form a positioning boss; the positioning boss is provided with a lubricating oil circuit outlet.

10. A method for using a wind turbine generator main shaft and gearbox connection structure according to any one of claims 1 to 9, characterized in that: include: Install the primary planet carrier into the fan main shaft, the inner spline of the fan main shaft matches with the outer spline of the planet carrier, the first boss structure of the fan main shaft and the second boss structure of the primary planet carrier are in close contact, forming a positioning boss to achieve axial positioning; A sealing ring is arranged on the inner spline of the fan main shaft and the outer spline of the planet carrier close to the pressure plate, which is pressed by the pressure plate and screwed in with bolts to achieve sealing and connection between the planet carrier and the fan main shaft; The secondary planetary carrier is connected to the end of the primary planetary carrier away from the fan main shaft, so that the lubricating oil paths on the secondary planetary carrier, the primary planetary carrier and the pressure plate are connected. The lubricating oil flows through the secondary planetary carrier, the primary planetary carrier and the pressure plate, reaches the meshing point between the inner spline and the outer spline, and flows out from the lubricating oil path outlet on the positioning boss.

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