Integrated wind power main transmission device

Abstract

The invention relates to the technical field of wind power transmission, and discloses an integrated wind power main transmission device which comprises a three-row column main bearing and a wind power gear box, the bearing inner ring of the three-row column main bearing is fixedly connected with a wind power hub, and the bearing outer ring of the three-row column main bearing is fixedly connected with a shell of the wind power gear box. An output flange of the wind power gear box is fixedly connected with an input flange of the permanent magnet generator, the wind power gear box comprises a first planet wheel mechanism, a second planet wheel mechanism and a third planet wheel mechanism, and the first planet wheel mechanism, the second planet wheel mechanism and the third planet wheel mechanism are arranged in the wind power gear box in the direction from the wind power hub to the permanent magnet generator. The arrangement positions of the first planet wheel mechanism, the second planet wheel mechanism and the third planet wheel mechanism are the second planet wheel mechanism, the first planet wheel mechanism and the third planet wheel mechanism in sequence, an integrated structure is adopted as a whole, the size is smaller, the weight is lighter, and the occupied space of the wind power main shaft device can be better saved; and the hoisting and mounting difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power transmission, and in particular to an integrated wind power main transmission device. Background Art

[0002] A wind turbine is a green power generation device that converts wind energy. The wind turbine hub of a wind turbine is equipped with multiple long blades. When the wind acts on the blades, a huge torque will be generated at the wind turbine hub, but the speed of the wind turbine hub is very low. Too low a speed cannot meet the speed required by the generator to generate electricity, so a transmission system suitable for wind turbines is needed to complete the transmission from the wind turbine hub to the generator.

[0003] The wind turbine main drive system needs to convert the high-torque and low-speed rotation state at the wind turbine hub into a high-speed rotation state through the wind turbine gearbox, and the torque will also be reduced synchronously. When using the wind turbine transmission system, it is necessary to consider the impact of non-torsional loads on the transmission system. Non-torsional loads are one of the main causes of wind turbine gearbox failures. Wind turbines require ultra-large lifting equipment for installation. If the transmission system of the generator fails and needs maintenance, ultra-large lifting equipment is also required to lift the faulty equipment out of the wind turbine warehouse, which leads to extremely high maintenance costs for wind turbines. However, the current main shaft system lacks a design for reducing the transmission of non-torsional loads. Summary of the invention

[0004] The present invention aims to provide an integrated wind turbine main transmission device to reduce the transmission of non-torsion loads of the wind turbine main shaft system, thereby reducing the failure rate of the wind turbine transmission device.

[0005] The present invention is achieved through the following technical solutions: An integrated wind turbine main transmission device comprises a three-row column main bearing and a wind turbine gearbox, wherein the inner ring of the three-row column main bearing is fixedly connected to the wind turbine hub, the outer ring of the three-row column main bearing is fixedly connected to the shell of the wind turbine gearbox, the output flange of the wind turbine gearbox is fixedly connected to the input flange of a permanent magnet generator, the wind turbine gearbox comprises a first planetary gear mechanism, a second planetary gear mechanism and a third planetary gear mechanism, the transmission path from the wind turbine hub side to the permanent magnet generator is wind turbine hub-three-row column main bearing-first planetary gear mechanism-second planetary gear mechanism-third planetary gear mechanism-permanent magnet generator, in the direction from the wind turbine hub to the permanent magnet generator in the wind turbine gearbox, the arrangement positions of the first planetary gear mechanism, the second planetary gear mechanism and the third planetary gear mechanism are second planetary gear mechanism-first planetary gear mechanism-third planetary gear mechanism in sequence, and the second planetary gear mechanism and the third planetary gear mechanism are transmission connected through a transmission shaft.

[0006] In a possible design, the wind power gearbox includes a first planetary gear mechanism. The first planetary gear mechanism includes a first internal gear ring and a first planetary carrier. The inner ring of the bearing is fixedly connected to the first planetary carrier. The first internal gear ring is fixedly connected to the housing. The first planetary gear mechanism further includes a first planetary gear and a first sun gear. The first planetary gear is rotatably arranged on the first planetary carrier. The first planetary gear meshes with the first internal gear ring. The first planetary gear also meshes with the first sun gear.

[0007] In a possible design, the second planetary gear mechanism includes a second planetary gear, a second sun gear and a second planetary carrier. The second planetary gear is rotatably arranged on the second planetary carrier. The second planetary carrier rotates relative to the inner ring of the bearing. The internal teeth of the inner ring of the bearing mesh with the second planetary gear. The second planetary gear also meshes with the second sun gear. The second planetary carrier is fixedly connected to the first sun gear.

[0008] In a possible design, the three-row cylindrical main bearing is a three-row cylindrical bearing with internal teeth on the inner ring. The internal teeth on the inner ring of the bearing serve as the internal gear ring in the second planetary gear mechanism.

[0009] In a possible design, the third planetary gear mechanism includes a third internal gear ring, a third planetary gear, a third sun gear and a third planetary carrier. The third internal gear ring is fixed to the housing of the wind power gearbox. The third planetary gear is rotatably arranged on the third planetary carrier. The third planetary carrier rotates relative to the third internal gear ring. The third planetary gear meshes with the third internal gear ring. The third planetary gear also meshes with the third sun gear. The third sun gear is fixedly connected to the output flange.

[0010] In a possible design, the inner ring of the second sun gear is provided with a spline groove. A spline sleeve is fixedly provided on the third planetary carrier. The spline sleeve is also provided with a spline groove inside. Splines are provided at both ends of the transmission shaft. The transmission shaft is connected to the second sun gear and the third planetary carrier through splines respectively.

[0011] In a possible design, the housing includes a first housing and a second housing. The first housing and the second housing are fixedly connected.

[0012] In a possible design, the fixed connection is a bolt fixed connection.

[0013] In a possible design, the inner ring of the bearing is fixedly connected to the first internal gear ring. The outer ring of the bearing is fixedly connected to the housing of the wind power gearbox. The first planetary carrier also remains fixed to the housing.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The overall structure is integrated, with a smaller volume and lighter weight, which can save more space occupied by the wind power spindle device and reduce the difficulty of hoisting and installation.

[0015] 2. In the present invention, the ring gears in the first planetary gear mechanism and the second planetary gear mechanism are both fixed on the inner ring of the three-row cylindrical main bearing, which can greatly avoid the non-torsional load transfer between the first planetary gear mechanism and the second planetary gear mechanism, thereby effectively improving the service life of the entire wind power gearbox, reducing the maintenance cost, and enabling the entire transmission system to transmit more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings: Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the wind power gearbox and the three-row cylindrical main bearing of the present invention; Figure 3 is a schematic structural diagram of the first planetary gear mechanism and the second planetary gear mechanism of the present invention; Figure 4 is a simplified diagram of the rotational states of the first planetary gear mechanism and the second planetary gear mechanism of the present invention; Figure 5 is a schematic structural diagram of the third planetary gear mechanism of the present invention; Figure 6 is a schematic structural diagram of the first planetary gear mechanism and the second planetary gear mechanism in the second embodiment of the present invention; Figure 7 is a simplified diagram of the rotational states of the first planetary gear mechanism and the second planetary gear mechanism in the second embodiment of the present invention.

[0017] The reference numerals represent: 1 - wind power gearbox, 11 - first planetary gear mechanism, 1101 - first internal gear ring, 1102 - first planetary gear, 1103 - first sun gear, 1104 - first planetary carrier, 12 - second planetary gear mechanism, 1201 - second planetary gear, 1202 - second sun gear, 1203 - second planetary carrier, 13 - third planetary gear mechanism, 1301 - third internal gear ring, 1302 - third planetary gear, 1303 - third sun gear, 1304 - third planetary carrier, 2 - three-row cylindrical main bearing, 201 - bearing outer ring, 202 - bearing inner ring, 3 - wind power hub, 4 - permanent magnet generator, 5 - transmission shaft, 6 - first housing, 7 - second housing, 8 - spline sleeve, 9 - output flange. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0019] Embodiment 1, as Figures 1 to 5 As shown, this embodiment includes a three-row column main bearing 2 and a wind turbine gearbox 1, the bearing inner ring 202 of the three-row column main bearing 2 is fixedly connected to the wind turbine hub 3, the bearing outer ring 201 of the three-row column main bearing 2 is fixedly connected to the shell of the wind turbine gearbox 1, the output flange 9 of the wind turbine gearbox 1 is fixedly connected to the input flange of the permanent magnet generator 4, and the generator shell of the permanent magnet generator 4 is also fixedly connected to the shell of the wind turbine gearbox 1; The wind power gearbox 1 includes a first planetary gear mechanism 11, which includes a first inner gear ring 1101 and a first planet carrier 1104. The bearing inner ring 202 is fixedly connected to the first planet carrier 1104, and the first inner gear ring 1101 is fixedly connected to the housing. The first planetary gear mechanism 11 also includes a first planetary gear 1102 and a first sun gear 1103. The first planetary gear 1102 is rotatably arranged on the first planet carrier 1104, the first planetary gear 1102 is meshed with the first inner gear ring 1101, and the first planetary gear 1102 is also meshed with the first sun gear 1103. The first inner gear ring 1101 drives the first sun gear 1103 to rotate through the first planetary gear 1102, and the diameter of the first sun gear 1103 is smaller than that of the first inner gear ring 1101, thereby realizing speed increase transmission.

[0020] In this embodiment, the wind turbine gearbox 1 further includes a second planetary gear mechanism 12 and a third planetary gear mechanism 13. The transmission path from the wind turbine hub 3 to the permanent magnet generator 4 is wind turbine hub 3-three-row column main bearing 2-first planetary gear mechanism 11-second planetary gear mechanism 12-third planetary gear mechanism 13-permanent magnet generator 4. In the direction from the wind turbine hub 3 to the permanent magnet generator 4 in the wind turbine gearbox 1, the arrangement positions of the first planetary gear mechanism 11, the second planetary gear mechanism 12 and the third planetary gear mechanism 13 are respectively second planetary gear mechanism 12-first planetary gear mechanism 11-third planetary gear mechanism 13. The second planetary gear mechanism 12 and the third planetary gear mechanism 13 are connected by a transmission shaft 5, so that a longer transmission shaft 5 is arranged in the wind turbine gearbox 1 with a small space volume, which can greatly reduce the transmission of non-torsion load through the transmission shaft 5, can greatly reduce the external impact on the third planetary gear mechanism 13, and can effectively extend the service life of the third planetary gear mechanism 13.

[0021] Furthermore, the three-row cylindrical main bearing 2 is selected as a three-row cylindrical bearing with internal teeth on the inner ring. The internal teeth on the bearing inner ring 202 serve as the internal gear ring in the second planetary gear mechanism 12. Thus, the first planetary gear mechanism 11 and the internal gear ring part of the second planetary gear mechanism 12 are jointly fixed on the bearing inner ring 202, and the non-torque load between the two internal gear rings can be directly avoided. The second planetary gear mechanism 12 includes a second planetary gear 1201, a second sun gear 1202, and a second planetary carrier 1203. The second planetary gear 1201 is rotatably arranged on the second planetary carrier 1203. The second planetary carrier 1203 rotates relative to the bearing inner ring 202. The internal teeth of the bearing inner ring 202 mesh with the second planetary gear 1201. The second planetary gear 1201 also meshes with the second sun gear 1202. The second planetary carrier 1203 is fixedly connected to the first sun gear 1103.

[0022] It should be noted that the three-row cylindrical main bearing 2 can also be a three-row cylindrical bearing without internal teeth, and then a bearing is fixedly installed at the inner ring position of the three-row cylindrical bearing.

[0023] In this embodiment, the three-row cylindrical main bearing 2 is fixed in the wind power bin through a bearing seat, or can also be directly helically connected and fixed to the wind power bin through the bearing outer ring 201. The three-row cylindrical main bearing 2 bears the main non-torsional loads of the main wind power hub 3 and the blades.

[0024] It should be noted that the third planetary gear mechanism 13 is the stage with the highest operating speed and the most easily worn stage in the three-stage gear train in the wind power gearbox 1. Therefore, effectively avoiding the non-torsional load at the third planetary gear mechanism 13 can greatly improve the overall service life of the wind power gearbox 1, thereby reducing the maintenance and repair costs. After the three-row cylindrical main bearing 2 is selected as a three-row cylindrical bearing with internal teeth on the inner ring, there is no need to additionally set an internal gear ring at the second planetary gear mechanism 12, which can reduce the manufacturing cost of the second planetary gear mechanism 12 and also reduce the overall weight of the wind power gearbox 1. At the same time, it also ensures that the internal gear ring in the first planetary gear mechanism 11 and the internal gear ring in the second planetary gear mechanism 12 are not affected by the non-torsional load at the wind power hub 3, which can greatly reduce the non-torsional load transmission between the first planetary gear mechanism 11 and the second planetary gear mechanism 12, thereby reducing the load impact between the entire set of transmission structures in the wind power gearbox 1 again, effectively reducing the failure rate of the main transmission device, improving the service life, and reducing the maintenance and repair costs.

[0025] In this embodiment, the third planetary gear mechanism 13 includes a third internal gear ring 1301, third planetary gears 1302, a third sun gear 1303, and a third planetary carrier 1304. The third internal gear ring 1301 is fixed to the housing of the wind power gearbox 1. The third planetary gears 1302 are rotatably arranged on the third planetary carrier 1304. The third planetary carrier 1304 rotates relative to the third internal gear ring 1301. The third planetary gears 1302 mesh with the third internal gear ring 1301. The third planetary gears 1302 also mesh with the third sun gear 1303. The third sun gear 1303 is fixedly connected to the output flange 9, and the output flange 9 outputs power.

[0026] Beneficially, a spline groove is provided in the inner ring of the second sun gear 1202. A spline sleeve 8 is fixedly provided on the third planetary carrier 1304, and a spline groove is also provided in the spline sleeve 8. Splines are provided at both ends of the transmission shaft 5. The transmission shaft 5 is connected to the second sun gear 1202 and the third planetary carrier 1304 through splines. The spline structure can form a certain movable connection effect, thereby effectively avoiding the transmission of non-torsional loads between the third planetary carrier 1304 and the second sun gear 1202.

[0027] Beneficially, the housing includes a first housing 6 and a second housing 7. The first housing 6 and the second housing 7 are fixedly connected. Preferably, the first housing 6 and the second housing 7 are fixedly connected by bolts, so that the third planetary gear mechanism 13 can be disassembled separately. During maintenance, it is not necessary to hoist the entire gearbox, which can effectively reduce the hoisting difficulty.

[0028] Beneficially, for the convenience of maintenance, the fixed connections mentioned in this application preferably use bolt connection forms to ensure disassembly and assembly during maintenance and installation.

[0029] Working principle: When wind power generation is carried out, the wind power hub 3 is driven to rotate by the blades. The inner ring 202 of the bearing driven by the wind power hub 3 rotates. The inner ring 202 of the bearing drives the first internal gear ring 1101 to rotate. The first internal gear ring 1101 drives the first sun gear 1103 to rotate through the first planetary gears 1102. The first sun gear 1103 is fixedly connected to the second planetary carrier 1203 in the second planetary gear mechanism 12. Therefore, the first sun gear 1103 can drive the second planetary carrier 1203 to rotate, realizing driving the second planetary carrier 1203 to drive the second planetary gears 1201 to roll along the inner wall of the inner ring 202 of the bearing, and the second planetary gears 1201 then drive the second sun gear 1202 to roll.

[0030] The second sun gear 1202 is splined to the transmission shaft 5. The other end of the transmission shaft 5 is splined to the third planet carrier 1304. The second planetary gear mechanism 12 and the third planetary gear mechanism 13 are driven through the transmission shaft 5, which can greatly reduce the transmission of non-torsional loads between the second planetary gear mechanism 12 and the third planetary gear mechanism 13. The third planet carrier 1304 drives the third planetary gear 1302 to roll along the inner side of the third internal gear ring 1301. The self-rotation of the third planet carrier 1304 and the third planetary gear 1302 further drives the third sun gear 1303 to roll, so that the rotation speed of the third sun gear 1303 increases again. The third sun gear 1303 then transmits the rotation to the permanent magnet generator 4 from the output flange 9 for power generation. The overall structure is simple and compact, which can effectively reduce the occupied space of the transmission device, and at the same time can also reduce the overall weight and the hoisting difficulty.

[0031] Embodiment 2, as Figures 6 to 7 shown, the difference between this embodiment and Embodiment 1 is that, in this embodiment, the inner ring 202 of the bearing is fixedly connected to the first internal gear ring 1101, the outer ring 201 of the bearing is fixedly connected to the housing of the wind power gearbox 1, and the first planet carrier 1104 is also fixed to the housing.

[0032] Refer to Figure 6 and Figure 7 , when the inner ring 202 of the bearing is relatively fixed, the second planet carrier 1203 drives the second planetary gear 1201 to roll along the inner wall of the inner ring 202 of the bearing. The transmission between the second planet carrier 1203 and the second sun gear 1202 is a speed-increasing transmission. And because the inner ring 202 of the bearing itself also has rolling, and the rolling direction is the same as the rolling direction of the second planetary gear 1201 itself. That is to say, when the second planet carrier 1203 rotates one circle, the second sun gear 1202 will rotate more revolutions than when the inner ring 202 of the bearing is fixed, thus further increasing the transmission ratio. Compared with Embodiment 1, this embodiment can achieve a higher transmission ratio under the same gear size, and this transmission structure can also make the transmission between the first planetary gear mechanism 11 and the second planetary gear mechanism 12 more stable.

[0033] The specific embodiments described above have further elaborated on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated wind turbine main transmission device, comprising a three-row column main bearing (2) and a wind turbine gearbox (1), characterized in that: The bearing inner ring (202) of the three-row column main bearing (2) is fixedly connected to the wind turbine hub (3), the bearing outer ring (201) of the three-row column main bearing (2) is fixedly connected to the housing of the wind turbine gearbox (1), and the output flange (9) of the wind turbine gearbox (1) is fixedly connected to the input flange of the permanent magnet generator (4); The wind turbine gearbox (1) comprises a first planetary gear mechanism (11), a second planetary gear mechanism (12) and a third planetary gear mechanism (13); the transmission path from the wind turbine hub (3) to the permanent magnet generator (4) is wind turbine hub (3) - three-row column main bearing (2) - first planetary gear mechanism (11) - second planetary gear mechanism (12) - third planetary gear mechanism (13) - permanent magnet generator (4); In the direction from the wind turbine hub (3) to the permanent magnet generator (4) in the wind turbine gearbox (1), the first planetary gear mechanism (11), the second planetary gear mechanism (12) and the third planetary gear mechanism (13) are arranged in the order of second planetary gear mechanism (12) - first planetary gear mechanism (11) - third planetary gear mechanism (13); The second planetary gear mechanism (12) and the third planetary gear mechanism (13) are transmission-connected via a transmission shaft (5).

2. The integrated wind power main transmission device according to claim 1, characterized in that: The wind turbine gearbox (1) comprises a first planetary gear mechanism (11), the first planetary gear mechanism (11) comprising a first inner gear ring (1101) and a first planet carrier (1104), the bearing inner ring (202) being fixedly connected to the first planet carrier (1104), the first inner gear ring (1101) being fixedly connected to the housing, the first planetary gear mechanism (11) further comprising a first planetary gear (1102) and a first sun gear (1103), the first planetary gear (1102) being rotatably arranged on the first planet carrier (1104), the first planetary gear (1102) being meshed with the first inner gear ring (1101), and the first planetary gear (1102) also being meshed with the first sun gear (1103).

3. The integrated wind power main transmission device according to claim 2, characterized in that: The second planetary gear mechanism (12) comprises a second planetary gear (1201), a second sun gear (1202) and a second planet carrier (1203); the second planetary gear (1201) is rotatably arranged on the second planet carrier (1203); the second planet carrier (1203) rotates relative to the bearing inner ring (202); the inner teeth of the bearing inner ring (202) mesh with the second planetary gear (1201); the second planetary gear (1201) also meshes with the second sun gear (1202); and the second planet carrier (1203) is fixedly connected to the first sun gear (1103).

4. The integrated wind power main transmission device according to claim 3, characterized in that: The three-row column main bearing (2) is selected to have an inner ring fixedly provided with an inner gear ring, and the inner gear ring serves as the inner gear ring in the second planetary gear mechanism (12).

5. The integrated wind power main transmission device according to claim 3, characterized in that: The third planetary gear mechanism (13) comprises a third inner gear ring (1301), a third planetary gear (1302), a third sun gear (1303) and a third planet carrier (1304); the third inner gear ring (1301) is fixed to the housing of the wind power gearbox (1); the third planetary gear (1302) is rotatably arranged on the third planet carrier (1304); the third planet carrier (1304) and the third inner gear ring (1301) rotate relatively; the third planetary gear (1302) is meshed with the third inner gear ring (1301); the third planetary gear (1302) is also meshed with the third sun gear (1303); and the third sun gear (1303) is fixedly connected to the output flange (9).

6. The integrated wind power main transmission device according to claim 5, characterized in that: The inner ring of the second sun gear (1202) is provided with a spline groove, the third planet carrier (1304) is fixedly provided with a spline sleeve (8), the spline sleeve (8) is also provided with a spline groove, both ends of the transmission shaft (5) are provided with splines, and the transmission shaft (5) and the second sun gear (1202) as well as the transmission shaft (5) and the third planet carrier (1304) are connected via splines.

7. The integrated wind power main transmission device according to claim 1, characterized in that: The housing comprises a first housing (6) and a second housing (7), and the first housing (6) and the second housing (7) are fixedly connected.

8. An integrated wind power main transmission device according to any one of claims 1 to 7, characterized in that: The fixed connection is a bolt fixed connection.

9. The integrated wind power main transmission device according to claim 2, characterized in that: The bearing inner ring (202) is fixedly connected to the first inner gear ring (1101), the bearing outer ring (201) is fixedly connected to the housing of the wind power gearbox (1), and the first planet carrier (1104) is also fixed to the housing.

10. The integrated wind power main transmission device according to claim 3, characterized in that: The three-row column main bearing (2) is a three-row column bearing with internal teeth, and the internal teeth on the inner ring (202) of the bearing serve as the inner gear ring in the second planetary gear mechanism (12).

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