Shafting arrangement and wind turbine generator system

Abstract

The embodiment of the present application provides a shafting structure and a wind turbine generator set. The shafting structure comprises: a rotating shaft, the outer surface of the rotating shaft is provided with an axially extending positioning member; a sliding bearing assembly, the sliding bearing assembly comprises a bearing seat and a first pad assembly, the bearing seat is sleeved on the rotating shaft, the first pad assembly is detachably connected to the radially inner side of the first end of the bearing seat, and the first pad assembly is in sliding fit with the outer surface of the rotating shaft, and the first end of the bearing seat faces the positioning member; a first thrust assembly, the first end of the first thrust assembly is detachably connected with the first end of the bearing seat, the second end of the first thrust assembly is in sliding fit with the side of the positioning member facing the bearing seat, the length of the first thrust assembly in the axial direction of the rotating shaft is greater than or equal to the length of the first pad assembly in the axial direction of the rotating shaft, and the first thrust assembly is in a segmented structure in the circumferential direction of the bearing seat, and each segment can be separated from the bearing seat in the radial direction of the rotating shaft. The first pad assembly is convenient to maintain and has low maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, specifically to a shaft system structure and a wind turbine generator set. Background Technology

[0002] With the development of the wind power industry, the capacity of wind turbine generators is constantly increasing, placing higher demands on the load-bearing capacity of shaft bearings. Sliding bearings, with their high load-bearing capacity, high stability, impact resistance, and low cost, have become an important tool in the wind power industry. However, when current sliding bearings fail, it is necessary to disassemble large components such as the impeller and drive chain from the tower, and then disassemble the bearing housing from the shaft to replace the bearing pads that slide against the outer surface of the shaft. This process is difficult and costly. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide a shaft system structure and a wind turbine generator set that enables tower maintenance and replacement of roof tiles, making maintenance convenient and reducing maintenance costs.

[0004] A first aspect of the present invention provides a shaft system structure for a wind turbine generator set. The shaft system structure includes: a rotating shaft with an axially extending circumferential positioning member disposed on its outer surface; a sliding bearing assembly including a bearing housing and a first bearing pad assembly, the bearing housing being sleeved on the rotating shaft, the first bearing pad assembly being detachably connected to the radially inner side of a first end of the bearing housing and slidingly engaged with the outer surface of the rotating shaft, the first end of the bearing housing facing the axially positioning member; and a first thrust assembly, the first end of the first thrust assembly being detachably connected to the first end of the bearing housing, the second end of the first thrust assembly slidingly engaged with the side of the axially positioning member facing the bearing housing, the length of the first thrust assembly in the axial direction of the rotating shaft being greater than or equal to the length of the first bearing pad assembly in the axial direction of the rotating shaft, the first thrust assembly having a segmented structure in the circumferential direction of the bearing housing, and each segment being separable from the bearing housing in the radial direction of the rotating shaft.

[0005] A second aspect of the present invention provides a wind turbine generator set, comprising: a hub; and a shaft system structure as described in the above embodiments, wherein one end of the shaft near the axial positioning member is connected to the hub.

[0006] The shaft system structure provided in this embodiment of the invention features a first thrust assembly whose first end is detachably connected to the first end of the bearing housing. The second end of the first thrust assembly is slidably engaged with an axial positioning member on the side facing the bearing housing, thereby axially positioning the sliding bearing assembly in the direction near the axial positioning member. This facilitates the rotation of the shaft relative to the bearing housing by the axial positioning member. The first thrust assembly has a segmented structure in the circumferential direction of the bearing housing, with each segment capable of separating from the bearing housing radially from the shaft. Furthermore, the length of the first thrust assembly in the axial direction of the shaft is greater than or equal to the length of the first bearing pad assembly in the axial direction of the shaft. Therefore, when the first bearing pad assembly needs to be disassembled, there is no need to disassemble the impeller, transmission chain, or other components, nor to move the bearing housing. Each segment of the first thrust assembly can be directly removed from the bearing housing, providing sufficient clearance for the first bearing pad assembly. This facilitates pulling the first bearing pad assembly out of the bearing housing from its first end, enabling replacement of the first bearing pad assembly on the tower, greatly simplifying the disassembly and assembly process, making maintenance convenient and cost-effective.

[0007] The wind turbine generator set provided in this invention has a shaft with one end near the axial positioning member connected to the hub, which drives the shaft to rotate. When disassembling and replacing the first bearing pad assembly, it is not necessary to disassemble the hub or move the bearing housing. The first thrust assembly between the axial positioning member and the bearing housing can be directly disassembled, facilitating the pulling of the first bearing pad assembly from the first end of the bearing housing. This allows for replacement of the first bearing pad assembly on the tower, making maintenance convenient and cost-effective.

[0008] Further aspects and / or advantages of the general concept of the invention will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of the general concept of the invention. Attached Figure Description

[0009] The above and other objects and features of the present invention will become clearer from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0010] Figure 1 A cross-sectional schematic diagram of a shaft system structure according to an embodiment of this application is shown;

[0011] Figure 2 A schematic diagram of the structure of the first thrust assembly according to an embodiment of this application is shown;

[0012] Figure 3 A schematic diagram of the structure of the second thrust assembly and connecting flange according to an embodiment of this application is shown;

[0013] Figure 4 A partial cross-sectional schematic diagram of a sliding bearing assembly according to an embodiment of this application is shown;

[0014] Figure 5 A schematic diagram of the structure of a sliding bearing assembly according to an embodiment of this application is shown.

[0015] Figures 1 to 5 Explanation of icon numbers:

[0016] 10 rotating shafts, 110 axial positioning components,

[0017] 20 Sliding bearing assembly, 210 Bearing housing, 211 First mounting groove, 212 Second mounting groove, 220 First radial bearing pad, 221 First insertion part, 230 Second radial bearing pad, 231 Second insertion part.

[0018] 30 First thrust assembly, 310 First sub-thrust flange, 311 First connecting ring, 312 Second connecting ring, 313 First bolt, 320 First thrust bearing, 321 First thrust bearing body, 322 First thrust bearing support, 323 Second bolt

[0019] 40 Second thrust assembly, 410 Second thrust flange, 420 Second thrust bearing block,

[0020] 50 connecting flange. Detailed Implementation

[0021] The following detailed descriptions are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be altered as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0022] The features described herein may be implemented in various forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways in which the methods, apparatuses, and / or systems described herein will become clear upon understanding the disclosure of the invention.

[0023] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0024] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0025] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0026] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0027] Unless otherwise specified, the directional terms such as "above", "below", "top" and "bottom" used in this invention are all based on the orientation of the product when it is in normal use.

[0028] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains upon understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0029] The shaft system structure provided in this embodiment of the invention can be specifically used in wind turbine generator sets, with one end of the shaft connected to the hub of the wind turbine generator set and the other end connected to the gearbox and generator. Of course, the shaft system structure can also be applied to other equipment, not limited to wind turbine generator sets.

[0030] The following is combined with Figures 1 to 5 The shaft system structure provided in the embodiments of the present invention is described.

[0031] like Figure 1 and Figure 2 As shown, a first aspect embodiment of the present invention provides a shaft system structure for a wind turbine generator set, the shaft system structure including: a rotating shaft 10, the outer surface of which is provided with a circumferentially extending axial positioning member 110.

[0032] The shaft system structure also includes a sliding bearing assembly 20, which includes a bearing seat 210 and a first bearing pad assembly. The bearing seat 210 is sleeved on the rotating shaft 10. The first bearing pad assembly is detachably connected to the radial inner side of the first end of the bearing seat 210 and slides in cooperation with the outer surface of the rotating shaft 10. The first end of the bearing seat 210 is positioned facing the axial positioning member 110.

[0033] The shaft system structure also includes: a first thrust assembly 30, the first end of the first thrust assembly 30 being detachably connected to the first end of the bearing housing 210, the second end of the first thrust assembly 30 being slidably engaged with the axial positioning member 110 on the side facing the bearing housing 210, the length of the first thrust assembly 30 in the axial direction of the rotating shaft 10 being greater than or equal to the length of the first bearing pad assembly in the axial direction of the rotating shaft 10, the first thrust assembly 30 having a segmented structure in the circumferential direction of the bearing housing 210, and each segment being able to separate from the bearing housing 210 in the radial direction of the rotating shaft 10.

[0034] The shaft system structure provided in this embodiment of the invention has a first end of the first thrust assembly 30 detachably connected to the first end of the bearing housing 210, and a second end of the first thrust assembly 30 slidingly engaged with the axial positioning member 110 on the side facing the bearing housing 210, thereby achieving axial positioning of the sliding bearing assembly 20 in the direction close to the axial positioning member 110. This facilitates the rotating shaft 10 driving the axial positioning member 110 to rotate relative to the bearing housing 210. The first thrust assembly 30 has a segmented structure in the circumferential direction of the bearing housing 210. Each segment can be separated from the bearing housing 210 in the radial direction of the rotating shaft 10. Moreover, the length of the first thrust assembly 30 in the axial direction of the rotating shaft 10 is greater than or equal to the length of the first bearing pad assembly in the axial direction of the rotating shaft 10. Therefore, when it is necessary to disassemble the first bearing pad assembly, there is no need to disassemble the impeller, transmission chain, or other components, nor is it necessary to move the bearing housing 210. Each segment of the first thrust assembly 30 can be directly removed from the bearing housing 210, providing sufficient clearance for the first bearing pad assembly. This makes it easy to pull the first bearing pad assembly out of the first end of the bearing housing 210 and remove it from the bearing housing 210. The first bearing pad assembly can be replaced on the tower, which greatly simplifies the disassembly and assembly steps, makes maintenance convenient, and reduces maintenance costs.

[0035] Furthermore, the first thrust assembly 30 has a multi-segment structure. Compared to a one-piece ring structure, each segment is lighter and smaller, facilitating installation and transportation and reducing assembly costs. Moreover, the layout of the shaft system structure references... Figure 1 The first thrust assembly 30 is held in place by an axial positioning component 110 and a bearing housing 210, resulting in a simple layout, compact structure, and convenient assembly. Furthermore, in this embodiment, the first bearing pad assembly is detachably connected to the radially inner side of the first end of the bearing housing 210, meaning the first bearing pad assembly can be removed from the first end of the bearing housing 210.

[0036] Regarding the detachable connection between the first bearing assembly and the bearing housing 210, in some embodiments, such as Figure 4 and Figure 5 As shown, the first bearing pad assembly includes a plurality of first radial bearing pads 220, each of which is inserted into the inner surface of the first end of the bearing housing 210 along the axial direction of the rotating shaft 10. This allows for easy assembly and disassembly.

[0037] As an example, such as Figure 4 As shown, one of the inner surface of the first end of the bearing housing 210 and the first radial pad 220 is provided with a first mounting groove 211, and the other is provided with a first insertion part 221 adapted to the first mounting groove 211. The projection profile of the first insertion part 221 on any cross-section of the rotating shaft 10 is dovetail-shaped. This prevents the first radial pad 220 from easily falling out of the first mounting groove 211.

[0038] As an example, such as Figure 4 As shown, among the multiple first radial bearing pads 220, the number of first radial bearing pads 220 located in the upper half of the bearing housing 210 is less than the number of first radial bearing pads 220 located in the lower half of the bearing housing 210. When the end of the shaft 10 closest to the axial positioning member 110 is connected to the hub, the load on that end of the shaft 10 is larger. Therefore, supporting the bottom of the shaft 10 with a larger number of first radial bearing pads 220 is beneficial for stable support of the shaft 10. Moreover, compared to circumferentially distributed first radial bearing pads 220, material usage is reduced, saving costs.

[0039] Regarding the specific structure of the first thrust assembly 30, in some embodiments, such as Figure 2 As shown, the first thrust assembly 30 includes a first thrust flange and a plurality of first thrust blocks 320.

[0040] The first thrust flange includes multiple first sub-thrust flanges 310. Each of the multiple first sub-thrust flanges 310 is detachably connected to the first end of the bearing housing 210 and is assembled into a ring to be fitted onto the rotating shaft 10. Each first sub-thrust flange 310 can be separated from the bearing housing 210 in the radial direction of the rotating shaft 10.

[0041] Each first thrust bearing 320 includes a first thrust bearing body 321 and a first thrust bearing support 322. The first thrust bearing body 321 is disposed on the first thrust bearing support 322 for sliding engagement with the axial positioning member 110. The first thrust bearing support 322 is disposed on the end face of the first thrust flange facing the axial positioning member 110. The plurality of first thrust bearings 320 are distributed circumferentially along the first thrust flange and form a ring structure.

[0042] Multiple first thrust pad body portions 321 are connected to the bearing housing 210 via first thrust pad support portions 322 and first thrust flanges. By increasing the length of the first thrust pad support portions 322 and the first thrust flange in the axial direction of the rotating shaft 10, clearance space can be provided for the disassembly of the first pad assembly, thus avoiding the need for the first thrust pad body portions 321 to be too thick in the axial direction of the rotating shaft 10, saving material for the first thrust pad body portions 321 and reducing costs.

[0043] Furthermore, each first sub-thrust flange 310 extends in an arc around the pivot 10, and the central angle corresponding to each first sub-thrust flange 310 is less than or equal to 180°. Each first thrust pad support portion 322 extends in an arc around the pivot 10, and the central angle corresponding to each first thrust pad support portion 322 is less than or equal to 180°. The first thrust pad body portion 321 includes at least one pad.

[0044] Regarding the arrangement of the first thrust pad support 322 and the first thrust flange, in one specific embodiment, multiple first thrust pad supports 322 are detachably connected to the end face of the first thrust flange facing the axial positioning member 110. This allows the multiple first thrust pads 320 to be separated from the first thrust flange radially from the rotating shaft 10. Therefore, when disassembling the first thrust assembly 30, the multiple first thrust pads 320 can be removed from the first thrust flange first, and then the first thrust flange can be removed from the bearing housing 210.

[0045] As an example, each first thrust bearing support 322 is connected to the first thrust flange by a second bolt 323, which protrudes radially from the axial positioning member 110 of the shaft 10. (Reference) Figure 1 and Figure 2 The axial positioning component 110 does not obstruct the second bolt 323, thus facilitating the removal of the second bolt 323 laterally to the left, allowing the second bolt 323 to detach from the first thrust bearing support 322. Then, the first thrust bearing support 322 and the first thrust bearing body 321 are simultaneously detached from the first thrust flange and bearing seat 210 in the radial direction of the rotating shaft 10. The connection is secure and easy to assemble and disassemble.

[0046] In another specific embodiment, a plurality of first thrust bearing support portions 322 are fixedly connected to the end face of the first thrust flange facing the axial positioning member 110. This connection can be achieved through welding or an interference fit, etc. In this case, at least one first thrust bearing 320 is fixedly connected to the end face of each first sub-thrust flange 310 facing the axial positioning member 110. When disassembling the first thrust assembly 30, each first sub-thrust flange 310 and the first thrust bearing 320 located thereon are simultaneously disassembled.

[0047] In another specific embodiment, the first thrust bearing support 322 of each first thrust bearing 320 is integrally formed with the first thrust flange. In this case, each first sub-thrust flange 310 is integrally formed with at least one first thrust bearing support 322. Both are made of the same material, are firmly connected, and are easy to process. When disassembling the first thrust assembly 30, each first sub-thrust flange 310 and the first thrust bearing 320 located thereon are simultaneously disassembled.

[0048] Based on the fact that multiple first thrust bearing support portions 322 are detachably connected to the first thrust flange, furthermore, there is a flange abutment seam between two circumferentially adjacent first sub-thrust flanges 310, and a bearing abutment seam between two circumferentially adjacent first thrust bearing support portions 322. In the circumferential direction of the rotating shaft 10, any flange abutment seam is staggered from all bearing abutment seams. That is, any circumferentially adjacent flange abutment seam is blocked by a certain first thrust bearing support portion 322. This first thrust bearing support portion 322 simultaneously connects the two circumferentially adjacent first sub-thrust flanges 310, so that in addition to being detachably connected to the first end face of the bearing housing 210, the multiple first sub-thrust flanges 310 are also limited in their relative positions in the circumferential direction of the rotating shaft 10 by the first thrust bearing support portions 322, thereby improving the installation stability of the first thrust flange and thus improving the installation stability of the first thrust bearing 320 located on it.

[0049] Furthermore, the number of first thrust bearings 320 is an integer multiple of the number of first sub-thrust flanges 310. A greater number of first thrust bearings 320 facilitates sufficient sliding engagement with the axial positioning element 110 in the circumferential direction of the rotating shaft 10. Each flange abutment corresponds to the midpoint of a first thrust bearing support 322. That is, the first thrust bearing support 322 connects two adjacent first sub-thrust flanges 310 in half, ensuring a stable connection and facilitating accurate midpoint alignment of the first thrust bearings 320 and the two first sub-thrust flanges 310.

[0050] As an example, such as Figure 2As shown, there are three first sub-thrust flanges 310 and six first thrust blocks 320. Each first sub-thrust flange 310 is arc-shaped with a corresponding central angle of 120°. Each first thrust block support 322 is arc-shaped with a corresponding central angle of 60°. Each first thrust block support 322 is provided with a first thrust block main body 321 comprising five blocks.

[0051] As an example, there are three first sub-thrust flanges 310 and nine first thrust blocks 320. Each first sub-thrust flange 310 is arc-shaped with a corresponding central angle of 120°, and each first thrust block support 322 is arc-shaped with a corresponding central angle of 40°. Each first thrust block support 322 is provided with a first thrust block body 321 comprising three blocks.

[0052] Of course, the number of first thrust bearings 320 may not be an integer multiple of the number of first sub-thrust flanges 310. For example, the number of first thrust bearings 320 may be eight and the number of first sub-thrust flanges 310 may be three, or the number of first thrust bearings 320 may be nine and the number of first sub-thrust flanges 310 may be four, and so on, which will not be listed here.

[0053] Furthermore, when the first thrust bearing support 322 is detachably connected to the first thrust flange, in the circumferential direction of the rotating shaft 10, the flange adjacent seam and the bearing adjacent seam may be aligned, either completely aligned when the number of both is the same, or partially aligned when the number of both is different.

[0054] Regarding the connection between the first thrust flange and the bearing housing 210, each first sub-thrust flange 310 is further connected to the first end face of the bearing housing 210 by a first bolt 313, the first bolt 313 being exposed radially on multiple first thrust bearing blocks 320 of the rotating shaft 10. (Reference) Figure 1 and Figure 2 The multiple first thrust bearings 320 do not obstruct the first bolt 313, thus facilitating the removal of the first bolt 313 laterally to the left, allowing the first bolt 313 to detach from the first sub-thrust flange 310, and then the first sub-thrust flange 310 to detach from the bearing housing 210 in the radial direction of the rotating shaft 10. The connection is firm and easy to install and disassemble.

[0055] Regarding the structure of the first thrust flange, further, as... Figure 1 and Figure 2As shown, multiple first sub-thrust flanges 310, when assembled into a ring, have a first connecting ring 311 and a second connecting ring 312 that surround the outer periphery of the rotating shaft 10 and are continuously distributed along the axial direction of the rotating shaft 10. The outer diameter of the first connecting ring 311 is smaller than the outer diameter of the second connecting ring 312. The first thrust flange has an approximately L-shaped structure, which is advantageous because it increases the length of the first connecting ring 311 along the axial direction of the rotating shaft 10, thereby increasing the overall length of the first thrust flange in that direction. This provides clearance for the removal of the first bearing assembly, reduces the material used in the first thrust flange, lightens its weight, and lowers costs.

[0056] Furthermore, multiple first thrust bearing support portions 322 are disposed on the first connecting ring 311, and the outer diameter of the axial positioning member 110 is smaller than the outer diameter of the first connecting ring 311.

[0057] When the first thrust bearing support 322 is detachably connected to the first connecting ring 311 using the aforementioned second bolt 323, the second bolt 323 can be connected to the portion of the first connecting ring 311 that extends beyond the axial positioning member 110, thereby providing clearance for the installation and removal of the second bolt 323. The second connecting ring 312 is connected to the first end of the bearing housing 210. Similarly, when the second connecting ring 312 is connected to the bearing housing 210 using the aforementioned first bolt 313, since the outer diameter of the first connecting ring 311 is smaller than the outer diameter of the second connecting ring 312, it is convenient for the first bolt 313 to be inserted into the second connecting ring 312 and also convenient for the first bolt 313 to be removed from the second connecting ring 312.

[0058] In some embodiments, such as Figure 1 and Figure 4 As shown, the sliding bearing assembly 20 also includes a second bearing pad assembly detachably connected to the radially inner side of the second end of the bearing housing 210. The second bearing pad assembly slides with the outer surface of the rotating shaft 10 and can be moved out of the second end of the bearing housing 210 along the gap between the rotating shaft 10 and the bearing housing 210. The rotating shaft 10 is supported by the first and second bearing pad assemblies at intervals, providing stable support. Moreover, both the first and second bearing pad assemblies are detachably connected to the same bearing housing 210. Compared with the traditional method of connecting a single set of bearing pad assemblies to different bearing housings 210, this method allows for the simultaneous machining of bearing housings 210 with two bearing pad assemblies and the simultaneous positioning and installation of bearing housings 210 with two bearing pad assemblies, ensuring the high coaxiality requirement of the bearing housing 210. This provides a highly reliable solution for ensuring coaxiality in batch shaft assembly scenarios.

[0059] In some embodiments, such as Figure 1 and Figure 3As shown, the shaft system structure also includes: a connecting flange 50, which is detachably connected to the end of the rotating shaft 10 away from the axial positioning member 110; and a second thrust assembly 40, the first end of which is detachably connected to the second end of the bearing housing 210, and the second end of which is slidably engaged with the end of the connecting flange 50 facing the bearing housing 210. Through the mutual cooperation of the first thrust assembly 30 and the second thrust assembly 40, the axial positioning of the bearing housing 210 can be achieved, preventing the bearing housing 210 from moving back and forth along the rotating shaft 10.

[0060] Regarding the structure of the second thrust assembly 40, in some embodiments, such as Figure 3 As shown, the second thrust assembly 40 includes: a second thrust flange 410, which is annular and detachably connected to the bearing housing 210; and a plurality of second thrust pads 420 disposed on the end face of the second thrust flange 410 facing the connecting flange 50 for sliding engagement with the connecting flange 50. When it is necessary to disassemble and replace the second pad assembly, the connecting flange 50 can be removed first, and then the second thrust flange 410 and the plurality of second thrust pads 420 located on the second thrust flange 410 can be removed simultaneously. The second pad assembly can then be pulled out from the second end of the bearing housing 210. The structure is simple and easy to assemble and disassemble.

[0061] Furthermore, each second thrust pad 420 is connected to the second thrust flange 410 by a third bolt. The third bolt is embedded in the second thrust pad 420, or the third bolt is exposed radially out of the connecting flange 50 on the rotating shaft 10. This is to prevent the third bolt from affecting the sliding fit between the second thrust pad 420 and the connecting flange 50.

[0062] In other embodiments, the second thrust assembly 40 has a segmented structure in the circumferential direction of the bearing housing 210, and each segment can be separated from the bearing housing 210 in the radial direction of the rotating shaft 10 to provide clearance space for the second bearing pad assembly to be removed from the bearing housing 210. The second thrust assembly 40 abuts against the second bearing pad assembly, and the length of the second thrust assembly 40 in the axial direction of the rotating shaft 10 is greater than or equal to the length of the second bearing pad assembly in the axial direction of the rotating shaft 10. Therefore, when disassembling and replacing the second bearing pad assembly, it is not necessary to disassemble the connecting flange 50; each segment of the second thrust assembly 40 can be directly removed, and then the second bearing pad assembly can be pulled out from the second end of the bearing housing 210.

[0063] In this configuration, the structure of the second thrust assembly 40 can be similar to the segmented first thrust assembly 30 described above. The second thrust assembly 40 includes a second thrust flange 410 and a plurality of second thrust pads 420. The second thrust flange 410 includes a plurality of second sub-thrust flanges (not shown in the figure), each of which is detachably connected to the second end of the bearing housing 210 and assembled into a ring to be fitted onto the rotating shaft 10. Each second sub-thrust flange is radially separable from the bearing housing 210. Each second thrust pad 420 includes a second thrust pad body and a second thrust pad support. The second thrust pad body is disposed on the second thrust pad support for sliding engagement with the connecting flange 50. The second thrust pad support 422 is disposed on the end face of the second thrust flange 410 facing the connecting flange 50. The plurality of second thrust pads 420 are distributed circumferentially along the second thrust flange 410 and form a ring structure.

[0064] The specific structural shape, connection method, distribution method, etc. of the second thrust flange 410 and the multiple second thrust pads 420 can be referred to the first sub-thrust flange 310 and the first thrust pad 320 mentioned above, and will not be repeated here.

[0065] Regarding the detachable connection between the second bearing assembly and the bearing housing 210, in some embodiments, such as Figure 4 As shown, the second bearing assembly includes a plurality of second radial bearings 230, each of which is inserted into the inner surface of the second end of the bearing housing 210 along the axial direction of the rotating shaft 10. This allows for easy assembly and disassembly.

[0066] As an example, such as Figure 4 As shown, one of the inner surfaces of the second end of the bearing housing 210 and the second radial pad 230 is provided with a second mounting groove 212, and the other is provided with a second insertion portion 231 adapted to the second mounting groove 212. The projection profile of the second insertion portion 231 on any cross-section of the rotating shaft 10 is dovetail-shaped. This prevents the second radial pad 230 from easily falling out of the second mounting groove 212.

[0067] As an example, such as Figure 4 As shown, among the multiple second radial bearing pads 230, the number of second radial bearing pads 230 located in the upper half of the bearing housing 210 is greater than the number of second radial bearing pads 230 located in the lower half of the bearing housing 210. When the end of the rotating shaft 10 closest to the axial positioning member 110 is connected to the hub, the bottom of the end of the rotating shaft 10 furthest from the connecting flange 50 bears a larger load, and the end of the rotating shaft 10 closest to the connecting flange 50 tends to tilt upwards. Therefore, by having a larger number of second radial bearing pads 230 abut against the top of the rotating shaft 10, it is beneficial to stably support the rotating shaft 10. Moreover, compared to circumferentially distributed second radial bearing pads 230, material usage is reduced, saving costs.

[0068] The shaft system structure of one embodiment of the present invention is described in detail below. The shaft system structure is as follows: Figure 1 As shown, the shaft 10 has an axial positioning element 110 near the hub. Multiple first thrust bearings 320 rub against the shoulder end face of this element when the impeller rotates, and together with the first thrust flange and the integrated bearing housing 210, limit the axial displacement of the shaft 10. The axial positioning element 110 and the shaft 10 are integrally formed. Of course, the axial positioning element 110 and the shaft 10 can also be separate structures.

[0069] like Figure 2 As shown, the shaft system structure includes three first sub-thrust flanges 310, and six first thrust bearing pads 320 are evenly distributed and fixed on the three first sub-thrust flanges 310. The three first sub-thrust flanges 310 are then fastened to an integrated bearing housing 210 by a ring of first bolts 313. The main function of the three first sub-thrust flanges 310 is to provide sufficient construction space for the replacement and maintenance of the first bearing pad assembly. When replacing the first bearing pad assembly, the first thrust bearing pads 320 are removed, the ring of first bolts 313 is removed, and the three first sub-thrust flanges 310 are removed, providing sufficient space for replacement. The segmented, three-part design makes the installation and disassembly of the three first sub-thrust flanges 310 technologically feasible.

[0070] like Figure 4 and Figure 5 As shown, both the first and second bearing pad assemblies are connected to the bearing housing 210 through a dovetail joint and mounting groove. During installation and maintenance, the first and second bearing pad assemblies can be pushed or pulled out through the dovetail joint.

[0071] like Figure 1 and Figure 3 As shown, multiple second thrust bearings 420 are connected to the second thrust flange 410 at the rear end of the shaft system. The second thrust flange 410 is connected to the integral bearing housing 210 by a ring of third bolts. The connecting flange 50 is fixed to the rotating shaft 10 by a ring of bolts. When an axial counterforce is generated, the connecting flange 50 rotates and rubs against the six second thrust flanges 410. The six second thrust flanges 410 transmit the force to the bearing housing 210, thereby limiting axial displacement.

[0072] In the shaft system layout, the design of the second thrust flange 410, the second bearing pad assembly, and the connecting flange 50 is mainly to limit axial displacement in the opposite direction and to facilitate the replacement of the second bearing pad assembly. When it is necessary to replace the second bearing pad assembly, removing the connecting flange 50, the second bearing pad assembly, and the second thrust flange 410 will provide the construction space for pulling out the second bearing pad assembly.

[0073] The integrated bearing housing 210 sliding shaft system structure proposed in this embodiment is simple and compact, capable of stably supporting radial and axial loads, reducing costs. Furthermore, the first and second bearing pad assemblies are easy to install, maintain, and disassemble, offering good maintainability and low cost. Moreover, compared to two separate bearing housings 210 connecting the first and second bearing pad assemblies respectively, the integrated bearing housing 210 allows for one-time machining and positioning installation, providing a highly reliable solution for ensuring coaxiality in batch shaft assembly scenarios.

[0074] A second aspect of the present invention provides a wind turbine generator set, including: a hub; and a shaft system structure as described in any of the above embodiments, wherein one end of the shaft 10 near the axial positioning member 110 is connected to the hub.

[0075] The wind turbine generator set provided in this embodiment of the invention has a shaft 10 with one end near the axial positioning member 110 connected to the hub, which drives the shaft 10 to rotate. When disassembling and replacing the first bearing pad assembly, it is not necessary to disassemble the hub or move the bearing seat 210. The first thrust assembly 30 between the axial positioning member 110 and the bearing seat 210 can be directly disassembled, which facilitates the first bearing pad assembly to be pulled out from the first end of the bearing seat 210 and detached from the bearing seat 210. This allows for the replacement of the first bearing pad assembly on the tower, making maintenance convenient and cost-effective.

[0076] While embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. It should be understood that, to those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A shaft system structure for wind turbine generator sets, characterized in that, The shaft system structure includes: A rotating shaft (10) is provided with a circumferentially extending axial positioning member (110) on its outer surface; A sliding bearing assembly (20) includes a bearing housing (210) and a first bearing pad assembly. The bearing housing (210) is sleeved on the rotating shaft (10). The first bearing pad assembly is detachably connected to the radially inner side of the first end of the bearing housing (210) and slides in cooperation with the outer surface of the rotating shaft. The first end of the bearing housing (210) faces the axial positioning member (110). The first thrust assembly (30) has a first end detachably connected to the first end of the bearing housing (210), and the second end of the first thrust assembly (30) is slidably engaged with the axial positioning member (110) on the side facing the bearing housing (210). The length of the first thrust assembly (30) in the axial direction of the rotating shaft (10) is greater than or equal to the length of the first bearing pad assembly in the axial direction of the rotating shaft (10). The first thrust assembly (30) has a segmented structure in the circumferential direction of the bearing housing (210), and each segment can be separated from the bearing housing (210) in the radial direction of the rotating shaft (10).

2. The shaft system structure according to claim 1, characterized in that, The first thrust assembly (30) includes: The first thrust flange includes a plurality of first sub-thrust flanges (310), each of which is detachably connected to the first end of the bearing housing (210) and assembled into a ring to be fitted onto the rotating shaft (10). Each first sub-thrust flange (310) can be separated from the bearing housing (210) in the radial direction of the rotating shaft (10). Multiple first thrust bearings (320), each first thrust bearing (320) includes a first thrust bearing body (321) and a first thrust bearing support (322). The first thrust bearing body (321) is disposed on the first thrust bearing support (322) for sliding engagement with the axial positioning member (110). The first thrust bearing support (322) is disposed on the end face of the first thrust flange facing the axial positioning member (110). The multiple first thrust bearings (320) are distributed circumferentially along the first thrust flange and form a ring structure.

3. The shaft system structure according to claim 2, characterized in that, The first thrust bearing support (322) is detachably connected to the first thrust flange. There is a flange abutment seam between two circumferentially adjacent first sub-thrust flanges (310), and there is a bearing abutment seam between two circumferentially adjacent first thrust bearing support (322). In the circumferential direction of the rotating shaft (10), any flange abutment seam is offset from all bearing abutment seams.

4. The shaft system structure according to claim 3, characterized in that, The number of the first thrust bearings (320) is an integer multiple of the number of the first sub-thrust flanges (310), and each flange abutment corresponds to the middle position of a first thrust bearing support (322).

5. The shaft system structure according to claim 4, characterized in that, The number of first sub-thrust flanges (310) is three, the number of first thrust blocks (320) is six, each first sub-thrust flange (310) is arc-shaped with a corresponding central angle of 120°, and each first thrust block support (322) is arc-shaped with a corresponding central angle of 60°; or The number of the first sub-thrust flanges (310) is three, the number of the first thrust blocks (320) is nine, each of the first sub-thrust flanges (310) is arc-shaped and the corresponding central angle is 120°, and each of the first thrust block support portions (322) is arc-shaped and the corresponding central angle is 40°.

6. The shaft system structure according to claim 2, characterized in that, The first thrust bearing support (322) is fixedly connected to the first thrust flange; or The first thrust bearing support (322) is integrally formed with the first thrust flange, and each first sub-thrust flange (310) is integrally formed with at least one first thrust bearing support (322).

7. The shaft system structure according to claim 2, characterized in that, Each of the first sub-thrust flanges (310) is connected to the first end face of the bearing housing (210) by a first bolt (313), the first bolt (313) being exposed radially out of the plurality of first thrust bearings (320) on the shaft (10); and / or Each of the first thrust bearing support portions (322) is connected to the first thrust flange by a second bolt (323), the second bolt (323) being exposed radially out of the axial positioning member (110) of the shaft (10).

8. The shaft system structure according to claim 2, characterized in that, The plurality of first sub-thrust flanges (310) are assembled into a ring and have a first connecting ring (311) and a second connecting ring (312) that surround the outer periphery of the rotating shaft (10) and are continuously distributed along the axial direction of the rotating shaft (10). The outer diameter of the first connecting ring (311) is smaller than the outer diameter of the second connecting ring (312). The first thrust bearing support (322) is disposed on the first connecting ring (311). The outer diameter of the axial positioning member (110) is smaller than the outer diameter of the first connecting ring (311). The second connecting ring (312) is connected to the first end of the bearing seat (210).

9. The shaft system structure according to claim 1, characterized in that, The first tile assembly includes a plurality of first radial tiles (220), each of which is inserted into the inner surface of the first end of the bearing housing (210) along the axial direction of the shaft (10).

10. The shaft system structure according to claim 9, characterized in that, One of the inner surface of the first end of the bearing housing (210) and the first radial pad (220) is provided with a first mounting groove (211), and the other is provided with a first insertion part (221) adapted to the first mounting groove (211). The projection profile of the first insertion part (221) on any cross-section of the rotating shaft (10) is dovetail-shaped; and / or, Of the plurality of first radial tiles (220), the number of first radial tiles (220) located in the upper half of the bearing housing (210) is less than the number of first radial tiles (220) located in the lower half of the bearing housing (210).

11. The shaft system structure according to any one of claims 1 to 10, characterized in that, The sliding bearing assembly (20) further includes a second pad assembly detachably connected to the radially inner side of the second end of the bearing housing (210), the second pad assembly slidingly engaging with the outer surface of the rotating shaft (10), and the second pad assembly being movable out from the second end of the bearing housing (210) along the gap between the rotating shaft (10) and the bearing housing (210); The shaft system structure also includes: A connecting flange (50) is detachably connected to one end of the rotating shaft (10) away from the axial positioning member (110); The second thrust assembly (40) has a first end detachably connected to the second end of the bearing housing (210), and the second end of the second thrust assembly (40) is slidably engaged with the end of the connecting flange (50) facing the bearing housing (210).

12. The shaft system structure according to claim 11, characterized in that, The second thrust assembly (40) includes: The second thrust flange (410) is annular and is detachably connected to the bearing housing (210). Multiple second thrust bearings (420) are disposed on the end face of the second thrust flange (410) facing the connecting flange (50) for sliding engagement with the connecting flange (50).

13. The shaft system structure according to claim 12, characterized in that, Each of the second thrust pads (420) is connected to the second thrust flange (410) by a third bolt, which is embedded in the second thrust pad (420) or exposed radially out of the connecting flange (50) on the shaft (10).

14. The shaft system structure according to claim 11, characterized in that, The second thrust assembly (40) has a segmented structure in the circumferential direction of the bearing housing (210), and each segment can be separated from the bearing housing (210) in the radial direction of the shaft (10) to provide clearance space for the second pad assembly to move out of the bearing housing (210); The second thrust assembly (40) abuts against the second tile assembly, and the length of the second thrust assembly (40) in the axial direction of the rotating shaft (10) is greater than or equal to the length of the second tile assembly in the axial direction of the rotating shaft (10).

15. The shaft system structure according to claim 14, characterized in that, The second tile assembly includes a plurality of second radial tiles (230), each of which is inserted into the inner surface of the second end of the bearing housing (210) along the axial direction of the shaft (10).

16. The shaft system structure according to claim 15, characterized in that, The inner surface of the second end of the bearing housing (210) and one of the second radial pads (230) are provided with a second mounting groove (212), and the other is provided with a second insertion part (231) adapted to the second mounting groove (212). The projection profile of the second insertion part (231) on any cross-section of the rotating shaft (10) is dovetail-shaped; and / or Of the plurality of second radial tiles (230), the number of second radial tiles (230) located in the upper half of the bearing housing (210) is greater than the number of second radial tiles (230) located in the lower half of the bearing housing (210).

17. A wind turbine generator set, characterized in that, include: Wheel hub; and According to any one of claims 1 to 16, in the shaft system structure, one end of the rotating shaft (10) closer to the axial positioning member (110) is connected to the wheel hub.

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