Novel bearing for fan blade main shaft of wind driven generator

Abstract

The utility model discloses a novel bearing for a fan blade main shaft of a wind power generator, which relates to the technical field of generator bearing equipment, and comprises a bearing seat, a bearing seat base, a bearing cover, a sectional bearing bush, an upper bushing and a lower bushing, the top end of the bearing seat is provided with a circular-truncated-cone-shaped mounting groove, and the bottom end of the bearing cover is a circular-truncated-cone-shaped surface matched with the circular-truncated-cone-shaped mounting groove. A first gap is reserved between the outer wall of the upper bushing and the top wall of the circular-truncated-cone-shaped mounting groove and a first gap is reserved between the outer wall of the lower bushing and the bottom wall of the bearing cover, and a plurality of sectional bearing bushes are movably arranged in the first gaps at equal angles. Compared with the prior art, the service life of the bearing is prolonged, stable and long-acting operation of the wind driven generator is effectively guaranteed, smaller bearing bush segments are adopted, the difficulty in manufacturing, mounting and transporting the bearing bush is reduced, and only a small number of bearing bush segments which break down need to be replaced during maintenance.

Description

TECHNICAL FIELD

[0001] The utility model relates to generator equipment technical field, concretely relates to a novel bearing for fan blade main shaft of wind driven generator. BACKGROUND

[0002] With the increasing demand for renewable energy worldwide, wind driven generators are developing towards larger size and more complex structure. This development trend puts higher requirements on the main bearing, which is a key component of the wind driven generator. It needs to have higher performance, can withstand dynamic and unpredictable external loads, and at the same time ensure that the wind driven generator can operate stably and continuously improve performance. With the continuous innovation of industry and academia, rolling bearing technology has developed for many years and continuously evolved to meet this special demand in the field of wind driven generators. Currently, spherical roller bearings and tapered roller bearings have become the main types of wind driven generator rotor bearings.

[0003] In the prior art, two single-row tapered roller bearings are used for double-point support. On the main shaft, two single-row tapered roller bearings are used to support axial and radial loads. It is relatively compact and has smaller mass. The use of double-row tapered roller bearing structure is more compact, but the radial dimension will increase accordingly. In the prior art, a cylindrical roller bearing and a double-row roller bearing are used to support the scheme. For wind driven generators with large axial load, a cylindrical roller bearing and a double-row roller bearing can be used to jointly bear the load, thereby reducing the size of the double-row tapered roller bearing and reducing the radial dimension. However, in the field of wind driven generators, due to the heavy weight of the blades, the blade main shaft bearing will bear a stable downward radial load. In addition, due to the thrust generated by the blade and air cutting, it will also bear a stable axial load. However, due to the rotation of the blade, the bearing will also bear a rotating load while bearing the above loads, and the load is large. In the northwest region, the northwest wind prevails, so the blade connecting main shaft bearing will bear a clockwise rotating load for a long time. In the southeast monsoon area, it will bear a bidirectional rotating load. Due to the combined action of rotating load and thrust load, the load on the side of the blade connecting main shaft bearing away from the blade is much larger than that on the blade side. This application scenario often uses an asymmetric bearing to achieve long service life in the field of wind driven generators, which can be installed and operated for a long time.

[0004] However the prior art mainly bears external load through the roller bearing in the rolling bearing, although the carrying capacity and impact resistance can be improved to a certain extent, and the structure is more compact through the combined use of multiple bearings, but the inner ring, outer ring and rolling body are still in rigid contact, and the impact is large after bearing external load, and the bearing is easy to wear and plastic deformation, and the problem of high bearing failure rate, low precision and high maintenance cost caused by easy wear and plastic deformation of the bearing under complex external load has not been fundamentally solved. Utility model content

[0005] The utility model provides a new type bearing for fan blade main shaft of wind driven generator to solve the problem that the prior art mainly bears external load through the roller bearing in the rolling bearing, although the carrying capacity and impact resistance can be improved to a certain extent, and the structure is more compact through the combined use of multiple bearings, but the inner ring, outer ring and rolling body are still in rigid contact, and the impact is large after bearing external load, and the bearing is easy to wear and plastic deformation, and the problem of high bearing failure rate, low precision and high maintenance cost caused by easy wear and plastic deformation of the bearing under complex external load has not been fundamentally solved.

[0006] The utility model adopts the technical scheme of containing bearing seat, bearing seat base, bearing cover, sectional type bearing bush, upper shaft bushing, lower shaft bushing;

[0007] The upper end of bearing seat base is fixed with bearing seat, and the top of bearing seat is provided with a circular table type mounting groove;

[0008] The top wall of circular table type mounting groove is detachably provided with bearing cover, and the bottom end of bearing cover is a circular table face matched with circular table type mounting groove;

[0009] The two sides of bearing cover are fixedly provided with bearing cover flanges, and the two bearing cover flanges are respectively provided with first limiting holes, and the two sides of bearing seat are fixedly provided with bearing bottom flanges;

[0010] The two bearing bottom flanges are respectively provided with first threaded holes matched with first limiting holes;

[0011] First fastening screws are respectively and threadedly penetrated in the two first threaded holes, and the two first fastening screws are respectively and slidingly penetrated between the first limiting holes close to them;

[0012] Upper shaft bushing and lower shaft bushing are movably arranged between circular table type mounting groove and bearing cover, and the upper shaft bushing and lower shaft bushing are detachably contacted;

[0013] The front side of the bearing seat base is provided with a generator, and a main shaft of the generator is fixedly arranged between the upper shaft liner and the lower shaft liner;

[0014] First gaps are left between the outer walls of the upper shaft liner and the lower shaft liner and the top wall of the circular truncated cone type mounting groove and the bottom wall of the bearing cover, and a plurality of sectional bearing bushes are movably arranged in the first gaps;

[0015] A plurality of sectional bearing bushes are detachably arranged on the inner walls of the upper shaft liner and the lower shaft liner.

[0016] Further, two second threaded holes are arranged on the two sides of the bearing seat base, and four second threaded holes are detachably connected with the generator base shell through second fastening screws.

[0017] Further, a plurality of sectional bearing bushes respectively include upper bearing bushes, lower bearing bushes, horizontal connecting plates, and vertical connecting plates;

[0018] A plurality of mounting grooves are equidistantly arranged on the outer walls of the upper shaft liner and the lower shaft liner;

[0019] A plurality of lower bearing bushes are detachably and slidably arranged in the mounting grooves;

[0020] An upper bearing bush is arranged above the lower bearing bush;

[0021] A plurality of upper bearing bushes are detachably and slidably arranged in the circular truncated cone type mounting groove or on the bottom wall of the bearing cover;

[0022] Horizontal connecting plates are arranged between the lower bearing bushes and the upper bearing bushes;

[0023] The head and tail ends of the horizontal connecting plates are connected with the upper bearing bushes or the lower bearing bushes adjacent thereto through vertical mounting plates;

[0024] Second gaps are left between the upper bearing bushes and the lower bearing bushes and the side walls of the horizontal connecting plates adjacent thereto.

[0025] Further, rounded corners are arranged between a plurality of horizontal connecting plates and two vertical connecting plates adjacent thereto.

[0026] Further, the upper bearing bushes, the lower bearing bushes, the horizontal connecting plates, and the vertical connecting plates are made of flexible materials.

[0027] Further, an oil hole is arranged on the top wall of the bearing cover, and a first oil groove is arranged on the bottom wall of the bearing cover;

[0028] The oil hole and the first oil groove are in communication;

[0029] The top wall of the circular-truss type mounting groove is provided with a second oil groove, and the first oil groove and the second oil groove are communicated.

[0030] The upper bushings are respectively detachably and slidably arranged at the lower end of the first oil groove or the upper end of the second oil groove.

[0031] The utility model discloses a bearing cover, bearing seat and segmented type bushing of wind driven generator.

[0032] The utility model discloses a bearing cover, bearing seat and segmented type bushing of wind driven generator.

[0033] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages, which will be further explained below with reference to the drawings. DRAWINGS

[0034] The drawings that form a part of this application are intended to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the explanation thereof are used to explain the utility model and do not constitute improper limitation on the utility model.

[0035] Figure 1 It is the whole structure schematic diagram of the utility model;

[0036] Figure 2 It is the whole structure schematic diagram of the utility model bearing seat;

[0037] Figure 3 It is the whole structure schematic diagram of the utility model bearing cover;

[0038] Figure 4 It is the bottom structure schematic diagram of the utility model bearing cover;

[0039] Figure 5 It is the whole structure schematic diagram of the utility model segmented type bushing;

[0040] Figure 6 It is the whole structure schematic diagram of the utility model upper bushing;

[0041] Figure 7 It is the installation schematic view of the upper shaft bushing and the sectional type bearing bush of the utility model;

[0042] Figure 8 It is the schematic view of the working principle of the utility model.

[0043] Reference signs:

[0044] 1 is a bearing seat, 2 is a bearing cover, 3 is a sectional type bearing bush, 4 is an upper shaft bushing, 5 is a lower shaft bushing;

[0045] 101 is a bearing seat base, 102 is a first threaded hole, 103 is a circular table type installation groove, 1011 is a second threaded hole, and 1031 is a second oil groove;

[0046] 201 is an oil hole, 202 is a first oil groove, 203 is a first limiting hole, and 204 is a first limiting hole;

[0047] 301 is an upper bearing bush, 302 is a lower bearing bush, 303 is a horizontal connecting rod, and 304 is a rounded corner;

[0048] 401 is an installation groove. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below by combining with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not used to limit the utility model.

[0050] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0051] Reference Figures 1 to 8 A new type of bearing for a fan blade main shaft of a wind driven generator, comprising a bearing seat 1, a bearing seat base 101, a bearing cover 2, a sectional type bearing bush 3, an upper shaft bushing 4 and a lower shaft bushing 5;

[0052] The upper end of the bearing seat base 101 is fixedly provided with the bearing seat 1, and the top end of the bearing seat 1 is provided with a circular table type installation groove 103;

[0053] The bearing cover 2 is detachably installed on the top wall of the circular table type installation groove 103, the bottom end of the bearing cover 2 is a circular table surface matched with the circular table type installation groove 103, and the circular table surface and the circular table type installation groove 103 form a complete circular table space.

[0054] Two bearing cover flanges 204 are respectively fixedly installed on the two sides of the bearing cover 2, and first limiting holes 203 are respectively installed on the two bearing cover flanges 204.

[0055] First threaded holes 102 that are matched with the first limiting holes 203 are respectively installed on the two bearing bottom flanges;

[0056] First fastening screws are respectively and threadedly penetrated and installed in the two first threaded holes, and the two first fastening screws are respectively and slidingly penetrated and arranged between the first limiting holes 203 close to the first fastening screws, so that the bearing seat 1 and the bearing cover 2 can be fixed together through the first fastening screws;

[0057] An upper shaft bushing 4 and a lower shaft bushing 5 are respectively and movably installed between the circular table type mounting groove 103 and the bearing cover 2, the upper shaft bushing 4 and the lower shaft bushing 5 are detachably contacted, and the outer walls of the upper shaft bushing 4 and the lower shaft bushing 5 are inclined walls matched with the above-mentioned circular table type space, which can reduce the radial load through the inclined walls;

[0058] A generator main shaft is fixedly installed between the upper shaft bushing 4 and the lower shaft bushing 5;

[0059] First gaps are respectively left between the outer walls of the upper shaft bushing 4 and the lower shaft bushing 5 and the top wall of the circular table type mounting groove 103 and the bottom wall of the bearing cover 2, and a plurality of sectional type bearing pads 3 are equiangularly and movably installed in the first gaps, the plurality of sectional type bearing pads 3 are used for supporting the generator main shaft to rotate, compared with the traditional sliding bearing, the plurality of sectional type bearing pads 3 are divided into a plurality of parts, so that only a small number of bearing pad segments that are faulty need to be replaced in the maintenance process, instead of replacing the entire bearing pad, which effectively reduces the maintenance cost, and the smaller segments reduce or even eliminate the hoisting operation during the bearing pad maintenance, thereby effectively reducing the difficulty of offshore, desert and high-altitude operation maintenance bearing, and improving the operation safety;

[0060] The plurality of sectional type bearing pads 3 are respectively and detachably installed on the inner walls of the upper shaft bushing 4 and the lower shaft bushing 5.

[0061] Two second threaded holes 1011 are respectively installed on the two sides of the bearing seat base 101, and the four second threaded holes 1011 are respectively and detachably connected with the generator frame shell through second fastening screws.

[0062] The plurality of sectional type bearing pads 3 respectively include an upper bearing pad 301, a lower bearing pad 302, a horizontal connecting plate 303 and a vertical connecting plate;

[0063] A plurality of installation grooves 401 are respectively and equidistantly arranged on the outer walls of the upper shaft bushing 4 and the lower shaft bushing 5;

[0064] The lower bearing pads 302 are respectively and detachably and slidingly installed in the plurality of installation grooves 401;

[0065] The upper bearing shell 301 is mounted above the lower bearing shell 302;

[0066] The upper bearing shells 301 are respectively detachably and slidably mounted in the circular table type mounting groove 103 or the bottom wall of the bearing cover 2;

[0067] The horizontal connecting plate 303 is mounted between the upper bearing shell 301 and the lower bearing shell 302;

[0068] The head and tail ends of the horizontal connecting plate 303 are respectively connected with the upper bearing shell 301 or the lower bearing shell 302 through a vertical mounting plate;

[0069] The upper bearing shell 301 and the lower bearing shell 302 respectively leave a second gap between the side wall of the horizontal connecting plate 303, and the upper bearing shell 301, the lower bearing shell 302, the horizontal connecting plate 303 and the vertical mounting plate form a Z-shaped bearing shell group, the horizontal connecting plate 303 respectively forms a deformation groove between the upper bearing shell and the lower bearing shell, each Z-shaped bearing shell group is clamped in the mounting groove 401 of the upper and lower bearing shells, and a plurality of Z-shaped bearing shell groups are arranged around a circle to form a complete bearing shell. The traditional bearing shell is the part of the sliding bearing and the shaft neck contact, which is shaped as a semicylindrical surface, very smooth, generally supported by bronze, friction-reducing alloy and other wear-resistant materials. The structure of the traditional bearing shell is changed to a plurality of Z-shaped bearing shells in the present application, and the lower bearing shell 302 of the Z-shaped bearing shell cooperates with the mounting groove 401 to limit the rotating direction of the bearing shell. The mounting groove 401 plays a role similar to a retainer in the traditional sliding bearing. When the main shaft of the wind turbine begins to rotate, the Z-shaped structure of the plurality of Z-shaped bearing shells and the flexible material thereof can effectively reduce the load.

[0070] The rounded corners 304 are mounted between the plurality of horizontal connecting plates 303 and the two vertical connecting plates adjacent thereto, which can reduce stress concentration and avoid cracking.

[0071] The upper bearing shell 301, the lower bearing shell 302, the horizontal connecting plate 303 and the vertical mounting plate are made of flexible material, because the function of the main bearing of the wind turbine is to transmit the non-torque load of the main shaft from the wind field to the rack, and the shaft is inclined in the bearing due to high bending moment. If the sliding bearing is used as the main bearing, the sliding section is rigidly mounted on the bearing seat, the sliding section cannot adapt to the displacement and deformation of the shaft, and local small lubrication gaps will appear. These small gaps on the outer edge of the bearing will cause high pressure (edge load). If sufficient running-in cannot be ensured, the bearing may fail. Therefore, in order to avoid edge load, the bearing shell is designed to be flexible, and the Z-shaped bearing shell group has an upper, middle and lower three-layer structure, each layer is made of spring steel with a certain thickness to ensure the flexible deformation of the bearing shell.

[0072] An oil hole 201 is installed on the top wall of the bearing cover 2, and a first oil groove 202 is provided on the bottom wall of the bearing cover 2.

[0073] The oil hole 201 is connected to the first oil groove 202;

[0074] A second oil groove 1031 is provided on the top wall of the frustum-shaped mounting groove 103, and the first oil groove 202 and the second oil groove 1031 are connected to each other;

[0075] Several upper bearing shells 301 are detachably and slidably installed at the lower end of the first oil groove 202 or the upper end of the second oil groove 1031. By injecting lubricating oil from the oil hole 201 at the top of the bearing cover 2, the lubricating oil is guided through the first oil groove 202 and the second oil groove 1031, thereby forming a circumferential loop, so that each Z-shaped bearing shell assembly can come into contact with the lubricating oil and reduce friction.

[0076] The implementation method of this utility model:

[0077] When the main shaft of the wind turbine is subjected to external load and tilts relative to the axis of the bearing housing, the shaft will tilt and sway synchronously along with the upper bearing 4 and the lower bearing 5 and the segmented bearing shell 3.

[0078] Since the upper bearing shell of the segmented bearing shell 3 is in contact with the frustum-shaped mounting groove 103 and the inner side of the bearing cover 2, it cannot be displaced. Therefore, the bottom and middle layers of the bearing shell mainly undergo flexible deformation as the main shaft and the upper and lower bushings swing.

[0079] When external load causes the spindle to undergo such... Figure 8 When the left side is higher than the right side, as shown in Figure A, the bottom and middle layers of the bearing bush on side a undergo a certain flexible displacement towards the top layer, thereby avoiding increased wear due to insufficient clearance and poor lubrication between the main shaft and the bearing bush on side a.

[0080] When external load causes the spindle to undergo such... Figure 8 When the left side is lower than the right side, as shown in B, the bottom and middle layers of the bearing bush on side b undergo a certain flexible displacement towards the top layer, thereby avoiding excessive wear due to poor lubrication caused by insufficient clearance between the main shaft and the bearing bush on side b.

[0081] When external load causes the spindle to undergo such... Figure 8 When both sides shown in C are tilted relative to the axis of bearing housing 1, the bottom and middle layers of the bearing bushes on both sides a and b undergo a certain degree of flexible displacement towards the top layer, thereby avoiding poor lubrication caused by insufficient clearance between the main shaft and the bearing bushes on both sides a and b.

[0082] In summary, due to the flexible deformation of the bottom layer and the middle layer, the sectional bearing shell 3 can follow the displacement of the generator main shaft and produce corresponding adaptive deformation, preventing the occurrence of edge load, reducing wear and reducing the probability of failure.

[0083] The utility model discloses a traditional rolling bearing is changed into sliding bearing, and the bearing carrying capacity is strengthened, can adapt to the demand of more power generation of wind driven generator, the utility model discloses the flexible bearing shell of deformable, guarantee main shaft and bearing shell between enough lubrication gap, reduce the impact, wear, plastic deformation after external load, improve bearing life, reduce the failure rate, effectively guarantee the smooth long -term operation of wind driven generator, the utility model discloses smaller bearing shell fragment, reduced the difficulty of bearing shell manufacturing, installation, transportation, especially after the failure, now only need to replace the small amount of bearing shell fragment of failure, and do not have to replace the whole bearing shell, effectively reduce the maintenance cost, smaller fragment reduces even exempts from the hoisting operation when bearing shell overhaul, thereby effectively reduce the difficulty of offshore, desert, high altitude operation maintenance bearing, and improve the operation safety.

[0084] The above only for the preferred embodiment of the utility model, and not to limit the utility model, any modification, equivalent replacement, improvement etc. within the spirit and principle of the utility model, should be contained in the protection scope of the utility model.

Claims

1. A new type of bearing for the main shaft of a wind turbine blade, characterized by: It comprises a bearing seat (1), a bearing seat base (101), a bearing cover (2), a segmented bearing bush (3), an upper bearing bush (4), and a lower bearing bush (5). The upper end of the bearing seat base (101) is fixedly provided with the bearing seat (1), and the top end of the bearing seat (1) is provided with a circular table type mounting groove (103). The top wall of the circular table type mounting groove (103) is detachably provided with the bearing cover (2), and the bottom end of the bearing cover (2) is a circular table surface matched with the circular table type mounting groove (103). The two sides of the bearing cover (2) are respectively fixedly provided with bearing cover flanges (204), and the two bearing cover flanges (204) are respectively provided with first limiting holes (203). The two sides of the bearing cover (2) are respectively fixedly provided with bearing cover flanges (204), and the two bearing cover flanges (204) are respectively provided with first limiting holes (203). The two bearing cover flanges (204) are respectively provided with first limiting holes (203), and the two sides of the bearing seat (1) are respectively fixedly provided with bearing bottom flanges. The two bearing bottom flanges are respectively provided with first threaded holes (102) matched with the first limiting holes (203). Two first threaded holes are respectively and threadedly penetrated by a first fastening screw, and the two first fastening screws are respectively and slidingly penetrated between the first limiting holes (203) close to them. The circular table type mounting groove (103) and the bearing cover (2) are respectively movably provided with the upper bearing bush (4) and the lower bearing bush (5), and the upper bearing bush (4) and the lower bearing bush (5) are detachably contacted. The front side of the bearing seat base (101) is provided with a generator, and the generator main shaft is fixedly provided between the upper bearing bush (4) and the lower bearing bush (5).

2. The new type of bearing for the main shaft of the fan blade of the wind driven generator as claimed in claim 1, wherein: The outer walls of the upper bearing bush (4) and the lower bearing bush (5) are respectively left with a first gap between the top wall of the circular table type mounting groove (103) and the bottom wall of the bearing cover (2), and a plurality of segmented bearing bushes (3) are angularly movably arranged in the first gap.

3. The new type of bearing for the main shaft of the fan blade of the wind driven generator as claimed in claim 1, wherein: A plurality of segmented bearing bushes (3) are respectively detachably arranged on the inner walls of the upper bearing bush (4) and the lower bearing bush (5). The two sides of the bearing seat base (101) are respectively provided with two second threaded holes (1011), and four second threaded holes (1011) are respectively detachably connected with the generator base shell through second fastening screws. A plurality of segmented bearing bushes (3) respectively comprise an upper bearing bush (301), a lower bearing bush (302), a horizontal connecting plate (303), and a vertical connecting plate. The outer walls of the upper bearing bush (4) and the lower bearing bush (5) are respectively and equidistantly provided with a plurality of mounting grooves (401). A plurality of lower bearing bushes (302) are respectively and detachably and slidingly arranged in a plurality of mounting grooves (401). The upper side of the lower bearing bush (302) is provided with an upper bearing bush (301). A plurality of upper bearing bushes (301) are respectively and detachably and slidingly arranged in the circular table type mounting groove (103) or on the bottom wall of the bearing cover (2). The horizontal connecting plate (303) is connected with the upper bearing bush (301) or the lower bearing bush (302) close to it through a vertical mounting plate at the head and tail ends of the horizontal connecting plate (303). The horizontal connecting plate (303) is connected with the upper bearing bush (301) or the lower bearing bush (302) close to it through a vertical mounting plate at the head and tail ends of the horizontal connecting plate (303). The upper bearing bush (301) and the lower bearing bush (302) are respectively provided with a second gap between the side wall of the horizontal connecting plate (303) adjacent thereto.

4. The new type of bearing for the main shaft of the fan blade of the wind driven generator as claimed in claim 3, wherein: The horizontal connecting plate (303) is provided with a rounded corner (304) between two vertical connecting plates adjacent thereto.

5. The new type of bearing for the main shaft of the fan blade of the wind driven generator as claimed in claim 3, wherein: The upper bearing bush (301), the lower bearing bush (302), the horizontal connecting plate (303) and the vertical connecting plate are made of a flexible material.

6. The new type of bearing for the main shaft of the fan blade of the wind driven generator as claimed in claim 3, wherein: The top wall of the bearing cover (2) is provided with an oil hole (201), and the bottom wall of the bearing cover (2) is provided with a first oil groove (202); The oil hole (201) and the first oil groove (202) are in communication; The top wall of the circular truncated cone type mounting groove (103) is provided with a second oil groove (1031), and the first oil groove (202) and the second oil groove (1031) are in communication; A plurality of upper bearing bushes (301) are respectively detachably and slidably arranged at the lower end of the first oil groove (202) or the upper end of the second oil groove (1031).

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