Shafting structure and wind generating set

Abstract

The invention relates to a shafting structure and a wind generating set. The shafting structure comprises a bearing seat, a rotating shaft and a sliding bearing. The bearing seat is provided with a shaft hole and an inner wall face defining the shaft hole. The rotating shaft is inserted into the shaft hole and can rotate relative to the bearing seat. The sliding bearing comprises a plurality of bearing bush units distributed in the circumferential direction of the shaft hole at intervals, and the bearing bush units are connected to the inner wall face of the bearing seat and form a bearing face for supporting the rotating shaft. Wherein the bearing areas of the at least two bearing bush units are different, according to the shafting structure provided by the embodiment of the invention, the at least two bearing bush units with different bearing areas can be arranged on the inner wall surface of the bearing seat according to actual working conditions, the stability of the shafting structure is improved, the shafting structure is suitable for actual conditions, and compared with a rolling bearing, the shafting structure is more stable. The sliding bearing is arranged, so that the machining cost of the shafting structure can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wind power, and particularly to a shafting structure and a wind turbine generator set. Background Art

[0002] As an important supporting part in wind power equipment, the bearing plays an irreplaceable and crucial role. At present, rolling bearings are mainly used for wind power bearings. However, with the development of the wind power industry, the capacity of the generator sets is continuously increasing, which puts higher requirements on the load-bearing capacity of the main bearings. Compared with rolling main bearings, sliding main bearings have become a technical means widely concerned in the current wind power industry due to their high load-bearing capacity, high stability, impact resistance, low cost, and easy maintenance.

[0003] The sliding bearing has been applied to the main bearing of the fan. The sliding bearing in the prior art is composed of multiple bearing bushes arranged at intervals in the circumferential direction. However, during the operation of the wind turbine generator set, the bearing bushes in some areas of the sliding bearing are extremely easy to wear, and the worn bearing bushes are not easy to replace, resulting in higher maintenance costs, and multiple shutdowns have led to a reduction in the power generation of the wind turbine generator set. Summary of the Invention

[0004] The present application provides a shafting structure and a wind turbine generator set. The bearing bush unit in the shafting structure has a reasonable distribution structure, can effectively support the rotating shaft, and the service life of the bearing bush is effectively extended.

[0005] On the one hand, according to an embodiment of the present application, a shafting structure is proposed. The shafting structure includes a bearing housing, a rotating shaft, and a sliding bearing. The bearing housing has a shaft hole and an inner wall surface enclosing the shaft hole. The rotating shaft is inserted into the shaft hole and can rotate relative to the bearing housing. The sliding bearing includes a plurality of bearing bush units distributed at intervals in the circumferential direction of the shaft hole. The bearing bush units are connected to the inner wall surface of the bearing housing and form a bearing surface for supporting the rotating shaft. Among them, the bearing areas of at least two bearing bush units are different.

[0006] In some embodiments, the bearing surface of each bearing bush unit has the same dimension in the axial direction, and the circumferential lengths of the bearing surfaces of at least two bearing bush units are different.

[0007] In some embodiments, the plurality of bearing bush units include at least one first bearing bush unit located above the horizontal plane passing through the center line of the shaft hole and at least one second bearing bush unit located below the horizontal plane. The bearing area of the first bearing bush unit is different from that of the second bearing bush unit.

[0008] In some embodiments, for the second bearing bush unit and the first bearing bush unit, the ratio a of the bearing area of one to the bearing area of the other satisfies 1 < a ≤ 1.2.

[0009] In some embodiments, the number of the first bearing shell units and the second bearing shell units is different, and among the first bearing shell units and the second bearing shell units, the bearing area and the number of one of them are both larger than those of the other; and / or, in the circumferential direction, the spacing between two adjacent first bearing shell units is different from the spacing between two adjacent second bearing shell units, and among the first bearing shell units and the second bearing shell units, the one with a smaller spacing has a larger bearing area.

[0010] In some embodiments, the bearing areas of all the first bearing shell units are the same, and / or, the bearing areas of all the second bearing shell units are the same.

[0011] In some embodiments, the sliding bearing includes a load-bearing area close to the vertical plane. In the circumferential direction, among all the first bearing shell units, the area of the first bearing shell unit close to the load-bearing area is larger than the area of the first bearing shell unit far from the load-bearing area, and / or, among all the second bearing shell units, the area of the second bearing shell unit close to the load-bearing area is larger than the area of the second bearing shell unit far from the load-bearing area.

[0012] In some embodiments, the number of the sliding bearings is two, and the two sliding bearings are arranged in pairs along the axial direction; among the sliding bearings arranged in pairs, the bearing area of the second bearing shell units of one of them is larger than the bearing area of the first bearing shell units, and the bearing area of the first bearing shell units of the other is larger than the bearing area of the second bearing shell units.

[0013] In some embodiments, each bearing shell unit includes a seat, a pad and a protective film. The seat is connected to the inner wall surface of the bearing housing, the pad is arranged on the seat to form a load-bearing surface, and the protective film covers the load-bearing surface.

[0014] The embodiment of the present application further provides a wind turbine generator, including the above shafting structure.

[0015] With the shafting structure and the wind turbine generator provided by the embodiment of the present application, through the setting that the bearing areas of at least two bearing shell units are different, the bearing shell units with different bearing areas are arranged in different stress areas of the sliding bearing, so that the actual load distribution of the rotating shaft can be scientifically and effectively borne, the stress distribution of the sliding bearing can be optimized, and further, while the stability of the shafting structure is improved, the service life of the sliding bearing is prolonged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0017] Figure 1 is a schematic structural diagram of a shafting structure according to an embodiment of the present application;

[0018] Figure 2 is a plan view of a shafting structure according to an embodiment of the present application;

[0019] Figure 3 It is a schematic structural view of the shafting structure of another embodiment of the present application;

[0020] Figure 4 It is a schematic plan view of the shafting structure of another embodiment of the present application.

[0021] In the drawings:

[0022] 100 Rotating shaft; 200 Sliding bearing;

[0023] 210 Bearing bush unit; 210a First bearing bush unit; 210b Second bearing bush unit; 211 Bush seat; 212 Bush block;

[0024] S Load-bearing surface; X Axial direction;

[0025] L1 Horizontal plane; P1 Load-bearing area.

[0026] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. Detailed implementation manners

[0027] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessarily obscuring the present application; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0028] The orientation terms appearing in the following description are all the directions shown in the drawings, and do not limit the shafting structure and the wind turbine generator set of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly defined and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present application may be understood according to specific circumstances.

[0029] As an important supporting part in wind power equipment, the bearing plays an irreplaceable and crucial role. At present, rolling bearings are mainly used in wind power bearings. However, with the development of the wind power industry, the capacity of the units is constantly increasing, which puts higher requirements on the load-bearing capacity of the main bearings. Compared with rolling main bearings, sliding main bearings have become a technical means widely concerned in the current wind power industry due to their high load-bearing capacity, high stability, impact resistance, low cost and easy maintenance. In recent years, sliding bearings have been applied to the main bearings of wind turbines. The inventor found that the bearing is composed of multiple bearing bushes of equal size. However, the magnitude and direction of the load borne by the bearing under variable rotational speed working conditions are different. Therefore, this distribution structure of the bearing bushes is unreasonable.

[0030] To solve the above problems, the embodiments of the present application provide a shafting structure and a wind turbine generator set, so that the bearing bush units in the shafting structure have a reasonable distribution structure, can effectively support the rotating shaft, and the service life of the bearing bushes is effectively extended.

[0031] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of a shafting structure according to an embodiment of the present application, Figure 2 which is a schematic plan view of a shafting structure according to an embodiment of the present application.

[0032] According to an embodiment of the present application, a shafting structure is proposed. The shafting structure includes a bearing housing, a rotating shaft 100, and a sliding bearing 200. The bearing housing has a shaft hole and an inner wall surface that encloses the shaft hole. The rotating shaft 100 is inserted into the shaft hole and can rotate relative to the bearing housing.

[0033] Taking the application of the shafting structure in a wind turbine generator set as an example for illustration, the bearing housing is the part that plays a supporting role in the shafting structure. It can be connected to the nacelle of the wind turbine generator set or the stator of the generator, or can be connected to the gearbox or other parts. The bearing housing can be of different structures such as an integral structure or a split structure.

[0034] Optionally, the shaft hole is a circular through hole and penetrates through the bearing housing.

[0035] Optionally, the bearing bush unit 210 is connected to the bearing housing through a detachable connection. Exemplarily, the bearing bush unit 210 is connected to the bearing housing through a bolt connection or a pin connection.

[0036] Optionally, the number of sliding bearings 200 can be one, two, or even multiple, etc. When the number of sliding bearings 200 is multiple, the number and arrangement of the bearing bush units included in each sliding bearing 200 can be adaptively adjusted to support the rotating shaft 100.

[0037] In the embodiments of the present application, the sliding bearing 200 includes a plurality of bearing bush units 210 that are circumferentially spaced along the axis hole. The bearing bush units 210 are connected to the inner wall surface of the bearing housing and form a bearing surface S for supporting the rotating shaft 100. Among them, the bearing areas of at least two bearing bush units 210 are different.

[0038] In the shafting structure provided by the embodiments of the present application, through the setting that the bearing areas of at least two bearing bush units 210 are different, the bearing bush units 210 with different bearing areas can support the rotating shaft 100, so that in actual working conditions, according to the stress received by different regions of the sliding bearing 200, bearing bush units 210 with different bearing areas are arranged in the corresponding regions of the inner wall surface of the bearing housing. For example, for the regions with larger stress on the rotating shaft 100, bearing bush units 210 with larger areas are set, and for the regions with smaller stress on the rotating shaft 100, bearing bush units 210 with smaller areas are set, so as to support the rotating shaft 100 through the bearing bush units 210 with different bearing areas, scientifically and effectively bear the actual load distribution of the rotating shaft 100, and improve the stability of the shafting structure; and compared with the prior art, the service life of the bearing bush located in the region with larger stress can be effectively extended, thereby reducing the maintenance cost.

[0039] Among them, the number of the bearing bush units 210 can be two, three, or even more. The bearing bush units 210 can be evenly distributed or unevenly distributed in the bearing housing, and the bearing bush units 210 can be located at any position on the inner wall of the bearing housing that needs to carry and support. The bearing areas of two, three, or more bearing bush units 210 are different.

[0040] According to the formula P = F / (B*d), where F is the radial force borne by the sliding bearing 200 under the rated working condition, with the unit of N, B is the axial X dimension of the sliding bearing 200, with the unit of mm, d is the diameter of the sliding bearing 200, with the unit of mm, P should be lower than the allowable value of the material of the sliding bearing 200, generally about 20 MPa. According to the above formula, the value of B*d can be calculated, which is the size of the total bearing area of the entire structure of the sliding bearing 200. Therefore, in actual applications, the total bearing area of the sliding bearing 200 can be determined according to the theoretical data of the B*d value, so that the bearing area corresponding to each bearing bush unit 210 can be calculated according to the actual requirements and the theoretical data of the B*d value.

[0041] In some embodiments, the dimension of the bearing surface S of each bearing bush unit 210 along the axial direction X is the same, and the lengths of the bearing surfaces S of at least two bearing bush units 210 along the circumferential direction are different.

[0042] Optionally, in the radial direction of the bearing housing, the orthographic projection of the bearing bush unit 210 includes a square, a rectangle, etc.

[0043] The shafting structure provided by the embodiment of the present application adjusts the circumferential length of the bearing bush unit 210 so that the bearing bush unit 210 has different bearing areas. The manufacturing process is relatively simple and easy to install.

[0044] It can be understood that in some other embodiments, it can also be that the axial X dimension is different and the circumferential dimension is different, or it can be that only one of the axial X dimension and the circumferential dimension is different. For the convenience of description, the following will take the case where the axial X dimension is the same and the circumferential dimension is different as an example for illustration.

[0045] In the shafting structure provided by the embodiment of the present application, during the rotation of the rotating shaft 100, due to radial forces such as the gravity of the rotating shaft 100 and the bending moment introduced by the impeller, with the horizontal plane L1 as the separation, the acting forces of the rotating shaft 100 on the bearing bush unit 210 above the horizontal plane L1 and the bearing bush unit 210 below the horizontal plane L1 are different.

[0046] Please refer to Figure 1 and Figure 2 , in some embodiments, the multiple bearing bush units 210 include at least one first bearing bush unit 210a above the horizontal plane L1 passing through the center line of the shaft hole and at least one second bearing bush unit 210b below the horizontal plane L1. The bearing area of the first bearing bush unit 210a is different from that of the second bearing bush unit 210b.

[0047] That is, the bearing bush unit 210 above the horizontal plane L1 is defined as the first bearing bush unit 210a, and the bearing bush unit 210 below the horizontal plane L1 is defined as the second bearing bush unit 210b.

[0048] Since in the actual application process, the rotating shaft 100 above the horizontal plane L1 and the rotating shaft 100 below the horizontal plane L1 need to receive different magnitudes of supporting forces, the bearing bush unit 210 can be separated by the horizontal plane L1. By adjusting the different bearing areas of the first bearing bush unit 210a and the second bearing bush unit 210b, it is more convenient to adapt to the stress distribution of the rotating shaft 100, thereby strengthening and preventing deformation of the entire shafting structure.

[0049] It can be understood that the number of the first bearing bush units 210a can be one, two or even more. When the number of the first bearing bush units 210a is multiple, the bearing areas of each first bearing bush unit 210a can be the same or different. Similarly, when the number of the second bearing bush units 210b is multiple, the bearing areas of each second bearing bush unit 210b can be the same or different, as long as it can be ensured that the bearing area of at least one first bearing bush unit 210a is different from that of the second bearing bush unit 210b.

[0050] Among them, the bearing relationship between the first bearing bush unit 210a and the second bearing bush unit 210b can be adjusted according to the actual needs. The bearing area of the first bearing bush unit 210a can be larger or smaller than the bearing area of the second bearing bush unit 210b. Moreover, the difference between the bearing area of the first bearing bush unit 210a and the bearing area of the second bearing bush unit 210b can also be adjusted according to the actual situation.

[0051] In some embodiments, in the second bearing bush unit 210b and the first bearing bush unit 210a, the ratio a of the bearing area of one to the bearing area of the other satisfies 1 < a ≤ 1.2.

[0052] For the shafting structure provided by the embodiments of the present application, by limiting the ratio of the bearing areas of the first bearing bush unit 210a and the second bearing bush unit 210b, and 1 < a ≤ 1.2, that is, the ratio of the bearing area of the first bearing bush unit 210a to the bearing area of the second bearing bush unit 210b is between 1 and 1.2, or the ratio of the bearing area of the second bearing bush unit 210b to the bearing area of the first bearing bush unit 210a is between 1 and 1.2, it can adapt to the magnitude of the supporting force required by the rotating shaft 100.

[0053] The value of the ratio a includes 1.10, 1.15, 1.2, etc.

[0054] Taking the second bearing bush unit 210b being larger than the first bearing bush unit 210a as an example, for the case where the dimensions of the bearing surfaces S of the first bearing bush unit 210a and the second bearing bush unit 210b along the axial direction X are the same, and the circumferential lengths are different. Exemplarily, along the radial direction of the bearing housing, the orthographic projection of the first bearing bush unit 210a can be a square, that is, the circumferential length of the first bearing bush unit 210a is equal to the axial length X. The orthographic projection of the second bearing bush unit 210b is a rectangle, that is, the circumferential length of the second bearing bush unit 210b is greater than the axial length X, and is 1 to 1.2 times the axial length X.

[0055] It can be understood that according to the actual loading situation, if only the bearing area is adjusted to adjust the supporting force of the bearing bush unit 210, it may lead to an overly large area of the bearing bush unit 210, increasing the manufacturing difficulty, and it is also not conducive to the support of the rotating shaft 100. Therefore, for the first bearing bush unit 210a and the second bearing bush unit 210b, in addition to adjusting the bearing area of the bearing bush unit 210, the setting density of the bearing bush unit 210 can also be adjusted to jointly achieve the support of the rotating shaft 100.

[0056] Among them, the setting density of the bearing shell unit 210 includes the number of the bearing shell units 210 and the spacing between two adjacent bearing shell units 210. Therefore, for the first bearing shell unit 210a and the second bearing shell unit 210b, in some embodiments, the numbers of the first bearing shell unit 210a and the second bearing shell unit 210b are different, and in the first bearing shell unit 210a and the second bearing shell unit 210b, the bearing area and the number of one are both greater than those of the other, and / or, along the circumferential direction, the spacing between two adjacent first bearing shell units 210a and the spacing between two adjacent second bearing shell units 210b are different, and in the first bearing shell unit 210a and the second bearing shell unit 210b, the one with a smaller spacing has a larger bearing area.

[0057] The shafting structure provided by the embodiment of the present application can, on the basis of increasing the bearing area, simultaneously adjust the setting density of the bearing shell units 210, that is, the number of the first bearing shell unit 210a or the second bearing shell unit 210b and the distance between two adjacent bearing shell units 210, to adapt to the actual stress distribution of the rotating shaft 100. Moreover, by means of the two combinations of reducing the spacing and increasing the bearing area, the effect of improving the supporting function can be achieved without setting the bearing area of the first bearing shell unit 210a or the second bearing shell unit 210b too large.

[0058] Exemplarily, taking the bearing area of the second bearing shell unit 210b being greater than that of the first bearing shell unit 210a as an example.

[0059] On this basis, the numbers of the first bearing shell unit 210a and the second bearing shell unit 210b can be equal, and by shortening the spacing between two adjacent second bearing shell units 210b, the local supporting force can be increased. It can also be that the spacing between two adjacent first bearing shell units 210a is equal to the spacing between two adjacent second bearing shell units 210b, and by increasing the spacing of the second bearing shell units 210b, the local supporting force can be increased. It can also be that the spacing of the second bearing shell units 210b is increased and the spacing between two adjacent second bearing shell units 210b is shortened simultaneously to increase the local supporting force.

[0060] Taking the rotating shaft 100 in a wind power generating set as an example, when the main rotation speed ratio of the rotating shaft 100 is between 6.8 rpm and 10.0 rpm.

[0061] To support one end of the rotating shaft 100, the number of the first bearing bush units 210a can be three. The first bearing bush units 210a are evenly distributed in the upper half, and the circumferential length of the first bearing bush units 210a is equal to the axial length in the X direction. Moreover, the number of the second bearing bush units 210b is six. The second bearing bush units 210b are evenly distributed in the lower half, and the circumferential length of the second bearing bush units 210b is greater than the axial length in the X direction and is 1.2 times the axial length in the X direction to meet the usage requirements of the rotating shaft 100 of the wind turbine generator at the above-mentioned rotational speed.

[0062] It should be noted that, in addition to the above embodiments, it can also be that the number of the first bearing bush units 210a is three, the number of the second bearing bush units 210b is also three, and the uneven distribution of the second bearing bush units 210b, etc., are used to increase the local supporting force, that is, it can meet the usage requirements of the rotating shaft 100 of the wind turbine generator at the above-mentioned rotational speed.

[0063] It can be understood that during the rotation of the rotating shaft 100, under the action of the radial force of the rotating shaft 100, in addition to the different acting forces of the rotating shaft 100 on the bearing bush units 210 above the horizontal plane L1 and the bearing bush units 210 below the horizontal plane L1, for different first bearing bush units 210a and different second bearing bush units 210b, the acting forces are also different.

[0064] In some embodiments, the bearing areas of the first bearing bush units 210a are the same, and / or the bearing areas of the second bearing bush units 210b are the same.

[0065] For different first bearing bush units 210a and different second bearing bush units 210b, the bearing areas of the first bearing bush units 210a can be the same, or the bearing areas of the second bearing bush units 210b can be the same, so as to simplify the settings of the first bearing bush units 210a and the second bearing bush units 210b under the condition of meeting the load-bearing requirements.

[0066] In some other embodiments, the sliding bearing 200 includes a load-bearing area P1 close to the vertical plane. In the circumferential direction, among the first bearing bush units 210a, the bearing area of the first bearing bush unit 210a close to the load-bearing area P1 is greater than that of the first bearing bush unit 210a far from the load-bearing area P1, and / or, among the second bearing bush units 210b, the bearing area of the second bearing bush unit 210b close to the load-bearing area P1 is greater than that of the second bearing bush unit 210b far from the load-bearing area P1.

[0067] For different first bearing units 210a and different second bearing units 210b, or for the stress in a local area, the area of the first bearing unit 210a or the second bearing unit 210b in this area can be adjusted.

[0068] For example, due to the influence of radial forces such as the gravity of the rotating shaft 100 and the bending moment of the impeller, that is, the positions of the highest and lowest points of the rotating shaft 100 in the height direction have the greatest load on the sliding bearing 200. Therefore, among the first bearing units 210a, the area of the first bearing unit 210a located at the highest point of the rotating shaft 100 can be made larger, or among the second bearing units 210b, the area of the second bearing unit 210b located at the lowest point of the rotating shaft 100 can be made larger, so as to more effectively bear the actual load distribution of the sliding bearing 200.

[0069] Furthermore, it can also be that along the direction close to the load-bearing area P1, the bearing areas of multiple first bearing units 210a gradually increase, or along the direction close to the load-bearing area P1, the bearing areas of multiple second bearing units 210b gradually increase, so as to better adapt to the stress distribution of the rotating shaft 100.

[0070] It can be understood that in practical applications, sliding bearings 200 are provided at both ends of the rotating shaft 100 to support both ends of the rotating shaft 100.

[0071] Please refer to Figures 1 to 4 , for the sliding bearings 200 at both ends, in some embodiments, the two sliding bearings 200 are arranged in pairs along the axial direction X. Among the paired sliding bearings 200, the bearing area of the second bearing unit 210b of one is larger than that of the first bearing unit 210a, and the bearing area of the first bearing unit 210a of the other is larger than that of the second bearing unit 210b.

[0072] For the two ends of the rotating shaft 100 in the shafting structure provided by the embodiments of the present application, the stress below the horizontal plane L1 at one end of the rotating shaft 100 is greater than the stress above the horizontal plane L1, and the stress above the horizontal plane L1 at the other end of the rotating shaft 100 is greater than the stress below the horizontal plane L1.

[0073] Therefore, correspondingly, the bearing area of the first bearing unit 210a of the sliding bearing 200 at one end can be made larger than that of the second bearing unit 210b, and the bearing area of the second bearing unit 210b of the sliding bearing 200 at the other end can be made larger than that of the first bearing unit 210a, so as to support both ends of the rotating shaft 100, improve the rotational stability of the rotating shaft 100, and have a wider range of use.

[0074] Optionally, the bearing bush units 210 of the pair of sliding bearings 200 are symmetrically arranged relative to the horizontal plane L1 to simplify the layout structure.

[0075] It can be understood that in some other embodiments, for both ends of the rotating shaft 100, if the supporting force meets the requirements after one end is supported by the bearing bush unit 210 in the above embodiment, then among the bearing bush units 210 at the other end, the bearing area of the first bearing bush unit 210a can also be equal to the bearing area of the second bearing bush unit 210b. Its specific structure can be adjusted according to the actual force condition, and the present application does not make specific limitations thereto.

[0076] In some embodiments, each bearing bush unit 210 includes a bush seat 211, a bearing pad 212, and a protective film. The bush seat 211 is connected to the inner wall surface of the bearing housing, the bearing pad 212 is arranged on the bush seat 211 and forms a bearing surface S, and the protective film covers the bearing surface S.

[0077] Specifically, the bush seat 211 has a first surface and a second surface arranged oppositely. The first surface is arc-shaped and adapted to the shape of the inner wall surface of the bearing housing, and the bearing pad 212 is connected to the second surface. The first surface and the inner wall surface of the bearing housing can be partially or completely fitted. Optionally, the two are completely fitted, that is, the two can be in full contact and abut against each other. The second surface of the bush seat 211 can be a plane or a curved surface, and can be specifically adapted to the shape of the bearing pad 212 to facilitate the installation of the bearing pad 212.

[0078] Optionally, the curvature radius of the first surface of the bush seat 211 of each bearing bush unit 210 is equal to the curvature radius of the shaft hole, so that the bearing housing and the first surface of the bush seat 211 can be machined in one step, improving the positioning accuracy of the bearing bush unit 210 and reducing the overall manufacturing cost.

[0079] An elastic member can also be arranged between the bush seat 211 and the bearing pad 212 to enable the bearing pad 212 to move relative to the bush seat 211 and fully fit the surface of the rotating shaft 100 to realize the support of the rotating shaft 100.

[0080] Among them, the connection of the bearing bush unit 210 to the bearing housing is realized through the bush seat 211. By arranging a protective film on the bearing surface S, the bearing surface S can be protected and the damage to the bearing surface S can be reduced. Specifically, the protective film can be set as a polyether ether ketone film, which has good wear resistance and excellent mechanical properties and self-lubricity.

[0081] Optionally, each bearing bush unit 210 further includes a connecting member, which is connected to the bearing housing and the bush seat 211 and restricts the relative positions of the bearing housing and the bush seat 211. Exemplarily, the connecting member includes at least one of a bolt, a pin shaft, and a key, and the connecting member is disposed through the bush seat 211 and the bearing housing. The detachable connection between the bearing bush unit 210 and the bearing housing can be realized through the setting of the connecting member. When a single bearing bush unit 210 is damaged, the bearing bush unit 210 can be conveniently disassembled and replaced.

[0082] An embodiment of the present application further provides a wind turbine generator set, including the above shafting structure.

[0083] The wind turbine generator set includes a tower, a generator, a nacelle, and an impeller. The nacelle is disposed at the top of the tower, the generator is disposed in the nacelle, the generator includes a rotor and a stator, the impeller includes a hub and blades, the impeller is connected to the rotor of the generator through the hub. When wind acts on the blades, the entire impeller and the rotor of the generator are driven to rotate, so that the rotor of the generator rotates relative to the stator, realizing the conversion of wind energy into electrical energy, and further meeting the power generation requirements of the wind turbine generator set.

[0084] Wherein, the shafting structure is located between the impeller and the generator. One end of the rotating shaft 100 of the shafting structure can be connected to the rotor, and the other end can be connected to the hub to transfer the kinetic energy of the blades of the impeller to the generator. The bearing housing can be connected to the nacelle, and the sliding bearing 200 is disposed between the rotating shaft 100 and the bearing housing and supports the rotating shaft 100.

[0085] In practical applications, sliding bearings 200 are disposed at both ends of the rotating shaft 100. The sliding bearings 200 at both ends include a front bearing and a rear bearing. The front bearing is located at one end close to the hub, and the rear bearing is located at one end close to the generator.

[0086] Specifically, the stress received by the front bearing below the horizontal plane L1 is greater than the stress received above the horizontal plane L1. Therefore, the number of the first bearing bush units 210a of the front bearing can be three, and the number of the second bearing bush units 210b can be six, and the bearing area of each second bearing bush unit 210b is 1.2 times that of the first bearing bush unit 210a; the stress received by the rear bearing below the horizontal plane L1 is less than the stress received above the horizontal plane L1. Therefore, the number of the first bearing bush units 210a of the rear bearing can be six, and the number of the second bearing bush units 210b can be three, and the bearing area of each first bearing bush unit 210a is 1.2 times that of the second bearing bush unit 210b.

[0087] The wind turbine provided by the embodiment of the present application can support the rotating shaft 100 through the arrangement of the sliding bearing 200, improving the stability of the shafting structure and further enhancing the stability of the wind turbine. Moreover, since the shafting structure of this embodiment can extend the service life of the sliding bearing 200, the maintenance cost of the wind turbine is reduced.

[0088] Although the present application has been described with reference to the preferred embodiments, various improvements can be made thereto and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A shafting structure, characterized in that, Comprising: A bearing housing having a shaft hole and an inner wall surface enclosing the shaft hole; A rotating shaft inserted into the shaft hole and capable of rotating relative to the bearing housing; A sliding bearing including a plurality of bearing bush units circumferentially spaced apart along the shaft hole, the bearing bush units being connected to the inner wall surface of the bearing housing and forming a bearing surface for supporting the rotating shaft; Wherein, the bearing areas of at least two of the bearing bush units are different.

2. The shafting structure according to claim 1, characterized in that The bearing surface of each bearing bush unit has the same dimension in the axial direction, and the circumferential lengths of the bearing surfaces of at least two of the bearing bush units are different.

3. The shafting structure according to claim 1, characterized in that, The plurality of bearing bush units include at least one first bearing bush unit above a horizontal plane passing through the center line of the shaft hole and at least one second bearing bush unit below the horizontal plane, and the bearing area of the first bearing bush unit is different from the bearing area of the second bearing bush unit.

4. The shafting structure according to claim 3, wherein In the second bearing bush unit and the first bearing bush unit, the ratio a of the bearing area of one to the bearing area of the other satisfies 1 < a ≤ 1.

2.

5. The shafting structure according to claim 3, characterized in that, The numbers of the first bearing bush unit and the second bearing bush unit are different, and in the first bearing bush unit and the second bearing bush unit, the bearing area and the number of one are both greater than those of the other; And / or, in the circumferential direction, the distances between adjacent two of the first bearing bush units and the distances between adjacent two of the second bearing bush units are different, and in the first bearing bush unit and the second bearing bush unit, the one with a smaller distance has a larger bearing area.

6. The shafting structure according to claim 3, wherein, The bearing areas of all the first bearing bush units are the same, and / or, the bearing areas of all the second bearing bush units are the same.

7. The shafting structure according to claim 3, characterized in that, The sliding bearing includes a load-bearing area close to a vertical plane; In the circumferential direction, among all the first bearing bush units, the area of the first bearing bush unit close to the load-bearing area is larger than the area of the first bearing bush unit far from the load-bearing area, and / or, among all the second bearing bush units, the area of the second bearing bush unit close to the load-bearing area is larger than the area of the second bearing bush unit far from the load-bearing area.

8. The shafting structure according to any one of claims 3 to 7, characterized in that, The number of the sliding bearings is two, and the two sliding bearings are arranged in pairs in the axial direction; In the pair of sliding bearings arranged, the bearing area of the second bearing bush unit of one is larger than the bearing area of the first bearing bush unit, and the bearing area of the first bearing bush unit of the other is larger than the bearing area of the second bearing bush unit.

9. The shafting structure according to claim 1, characterized in that, Each bearing bush unit includes a bush seat, a bush block and a protective film, the bush seat is connected to the inner wall surface of the bearing housing, the bush block is arranged on the bush seat and forms the bearing surface, and the protective film covers the bearing surface.

10. A wind power generating set, characterized in that, Including the shafting structure according to any one of claims 1 to 9.

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