Main shaft sliding bearing for wind generating set

Abstract

The spindle sliding bearing comprises a radial pad, a thrust pad and a bearing main body, the middle of the bearing main body is columnar, and the two sides of the bearing main body are conical tables; the radial pads are uniformly arranged in the middle of the through hole in the bearing main body in the circumferential direction, and the thrust pads are uniformly arranged on the conical tables at the two ends of the bearing main body in the circumferential direction. Compared with the prior art, the segmented sliding bearing is adopted, the conical surface radial pads and the inclined plane thrust pads are distributed in an array mode in the axial direction to form a multi-pad structure, and the pad replacement efficiency can be improved. The thrust pad installed in an inclined mode can bear radial loads and axial loads at the same time, and the overall bearing capacity of the bearing is enhanced while axial impact is borne.

Description

Technical Field

[0001] The invention belongs to the technical field of wind generator bearings, and in particular relates to a main shaft sliding bearing for a wind generator set. Background Art

[0002] Wind turbines operate outdoors year-round, under harsh conditions and complex loads. In addition to bearing the weight of the entire main drive train, wind turbine main shaft bearings must also withstand radial and axial loads, as well as overturning moments, generated by significant external wind loads. Consequently, high requirements are placed on wind turbine bearings for impact resistance, sealing, and high reliability. Currently, most wind turbine main shafts are supported by rolling bearings. High-end rolling bearings have a high failure rate and are complex to repair, resulting in prolonged wind turbine downtime and high maintenance costs.

[0003] To address these issues, the "sliding instead of rolling" approach has been proposed in recent years, offering a new approach to spindle bearing design. Combined radial and thrust sliding bearings offer a spindle support solution. However, currently, these combined sliding bearings can only support radial loads with radial pads, while thrust pads can mostly only support axial loads, not radial loads. Summary of the Invention

[0004] The purpose of the present invention is to provide a main shaft sliding bearing for a wind turbine generator set, wherein the thrust pad of the combined sliding bearing can simultaneously bear radial load and axial load, so as to achieve a better load-bearing capacity of the wind turbine main shaft bearing under complex wind load conditions.

[0005] The technical solution for achieving the purpose of the present invention is: a main shaft sliding bearing for a wind turbine generator set, including a bearing body, a radial pad, and a thrust pad; the bearing body is columnar in the middle and has conical platforms on both sides; the radial pads are evenly arranged in the middle position of the internal through hole of the bearing body along the circumferential direction, and the thrust pads are evenly arranged in the circumferential direction on the conical platforms at both ends of the bearing body.

[0006] The conical platforms on both sides of the bearing body are conical platforms protruding outwards or concave inwards.

[0007] Mounting grooves are evenly arranged along the circumferential direction on the tapered platform inclined surfaces on both sides of the bearing body for mounting thrust pads.

[0008] The radial pad is connected to the inner through hole of the bearing body via a second connecting bolt.

[0009] A first oil channel, a second oil channel and a third oil channel are provided inside the bearing body; a plurality of first oil channels are evenly provided along the circumference of the middle column of the bearing body, and the central axis of the first oil channel is along the radial direction of the middle column of the bearing body; the second oil channel is annularly provided inside the middle column of the bearing body and is connected to each first oil channel; a plurality of third oil channels are evenly provided along the circumference of the middle column of the bearing body, and the central axis of the third oil channel is parallel to the central axis of the bearing body, and is connected to the second oil channel, and extends out of the conical platforms at both ends of the bearing body.

[0010] The oil port of the first oil channel close to the outer surface of the bearing body is defined as the oil inlet, the oil port of the first oil channel close to the inner surface of the bearing body is defined as the second oil outlet; the oil ports at both ends of the third oil channel close to the tapered platform are defined as the first oil outlet.

[0011] A through hole is opened in the inner center line direction of the second connecting bolt, which is used to connect the lubricating oil in the first oil channel and transport it to the radial shoe working surface.

[0012] Compared with the prior art, the present invention has the following significant advantages:

[0013] (1) The tilted thrust pad designed in the wind turbine main shaft sliding bearing of the present invention has the ability to withstand wind loads in both radial and axial directions, and the overall working performance of the bearing is better under complex wind loads.

[0014] (2) The present invention provides mounting grooves on the mounting surfaces at both axial ends of the bearing body, which can quickly and accurately install and replace the thrust pads, thereby improving the installation, maintenance and replacement efficiency of the bearing pads.

[0015] (3) The present invention sets three internal oil passages inside the bearing body. The diameter of the first oil passage is larger than that of the other two oil passages. When the lubricating oil is introduced, a pressure difference can be formed to increase the oil supply pressure, making the oil flow smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the specific implementation methods of the present invention, the following briefly introduces the drawings required in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 Schematic diagram of the overall structure of the sliding bearing structure of the present invention;

[0018] Figure 2 Schematic diagram of the overall structure of the sliding bearing of the present invention (excluding one radial pad and two oblique thrust pads);

[0019] Figure 3It is a structural schematic diagram of the bearing body of the present invention;

[0020] Figure 4 A cross-sectional view showing a schematic diagram of the overall structure of the sliding bearing structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the overall structure of another structure of the sliding bearing of the present invention;

[0022] Explanation of the accompanying drawings: 1-bearing body; 2-radial pad; 3-thrust pad; 4-oil inlet; 5-thrust pad mounting groove; 6-bolt hole; 7-first oil outlet; 8-second oil outlet; 9-first connecting bolt; 10-second connecting bolt; 11-first oil channel; 12-second oil channel; 13-third oil channel. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] like Figures 1 to 3 As shown, the present invention discloses a main shaft sliding bearing for a wind turbine generator set. The structural combination of radial pads 2 and thrust pads 3 proposed in the present invention enables the wind turbine main shaft sliding bearing to have the bearing capacity of wind loads in both radial and axial directions, and has better working performance under complex wind conditions and loads.

[0027] The sliding bearing structure mainly includes a bearing body 1, a radial pad 2, and a thrust pad 3;

[0028] like Figure 1 As shown, the bearing body 1 is cylindrical in the middle and conical on both sides; a plurality of oil inlets 4 and a first oil channel 11 are evenly arranged in the circumferential direction in the middle of the bearing body 1, and a plurality of mounting grooves 5 for thrust pads 3 and a first oil outlet 7 are arranged on the inclined surfaces of the conical platforms on both sides of the bearing body 1 in the circumferential direction, wherein bolt holes 6 are arranged in the mounting grooves 5.

[0029] like Figures 1 to 3 As shown, the thrust pad 3 is fixedly installed in the inclined mounting groove 5 on both sides of the bearing body 1, and the mounting groove 5 is provided with a bolt hole 6 fixedly connected to the first connecting bolt 9. The bearing body 1 is fixedly connected to the thrust pad 3 by the first connecting bolt 9, so as to realize the oblique installation of the thrust pad 3 on the inclined surfaces on both sides of the bearing body 1, and a first oil outlet 7 is provided between the two thrust pads 3; the thrust pad 3 obliquely installed on the inclined surface can withstand radial and axial bidirectional loads, can better cope with the complex loads borne by the fan, and improves the overall load-bearing performance of the bearing.

[0030] The thrust pads 3 installed on the inclined surfaces on both sides of the bearing body 1 are evenly distributed in the circumferential direction to form a multi-pad structure. When the bearing pads fail, the failed pads can be directly replaced on the tower without removing the main shaft, thereby improving the maintenance efficiency of the power generator.

[0031] The radial pad 2 is fixedly connected to the bearing body 1 by a second connecting bolt 10, and the radial pad 2 is evenly distributed in multiple blocks along the annular direction on the inner wall surface of the bearing body 1; the second connecting bolt 10 has a through hole in the center line direction, which is used to transport the lubricating oil in the first oil channel 11 to the second oil outlet 8 on the working surface of the radial pad 2.

[0032] like Figure 4 As shown, the bearing body 1 is equipped with a first oil passage 11, a second oil passage 12, and a third oil passage 13. These three passages deliver sufficient lubricating oil to the bearing pads. The first oil passage 11 is the main radial oil inlet channel within the bearing body 1. Multiple passages are distributed along the circumference of the bearing body 1. The first oil passage 11 has a larger diameter within the bearing body 1 (the largest of the three passages) and begins to decrease after entering the radial pads 2, thereby increasing oil pressure. The high-pressure oil flows through the bearing body 1, the second connecting bolt 10, and the radial pads 2 before entering the bearing working surface.

[0033] Furthermore, the second oil passage 12 is an annular oil passage inside the bearing body 1. This oil passage is not directly connected to the outside and its main function is to connect the first oil passage 11 and the third oil passage 13. The second oil passage 12 is connected to the plurality of first oil passages 11 in the radial direction and to the plurality of third oil passages 13 in the axial direction.

[0034] Furthermore, the third oil passage 13 is an axial oil passage inside the bearing body 1 , and is distributed circumferentially along the bearing body 1 and is connected to the second oil outlet 8 ; high-pressure oil enters the second oil passage 12 through the first oil passage 11 and is transported to the third oil passage 13 before entering the second oil outlet 8 .

[0035] like Figure 5 As shown, the bearing is another embodiment of the present invention. Compared with the above embodiment in which the working surface of the thrust washer 3 is away from the central axis of the bearing and faces outward, the difference of this embodiment is that the working surface of the thrust washer faces the central axis of the bearing, but the thrust washer can also withstand radial and axial bidirectional loads, and the bearing schemes of other parts are consistent in the two.

[0036] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A main shaft sliding bearing for a wind turbine generator set, characterized in that: The invention comprises a bearing body (1), a radial pad (2), and a thrust pad (3); the middle of the bearing body (1) is columnar, and both sides are conical platforms; the radial pad (2) is evenly arranged in the middle position of the internal through hole of the bearing body (1) along the circumferential direction, and the thrust pad (3) is evenly arranged in the circumferential direction on the conical platforms at both ends of the bearing body.

2. The main shaft sliding bearing for a wind turbine generator set according to claim 1, characterized in that: The conical platforms on both sides of the bearing body (1) are conical platforms protruding outwards or concave inwards.

3. The main shaft sliding bearing for a wind turbine generator set according to claim 1, characterized in that: Mounting grooves (5) are evenly arranged along the circumferential direction on the tapered platform inclined surfaces on both sides of the bearing body (1) for mounting thrust pads (3).

4. The main shaft sliding bearing for a wind turbine generator set according to claim 1, characterized in that: The radial pad (2) is connected to the inner through hole of the bearing body (1) via a second connecting bolt (10).

5. The main shaft sliding bearing for a wind turbine generator set according to claim 1, characterized in that: The bearing body (1) is provided with a first oil passage (11), a second oil passage (12) and a third oil passage (13); a plurality of first oil passages (11) are evenly arranged along the circumference of the middle column of the bearing body (1), and the central axis of the first oil passage (11) is along the radial direction of the middle column of the bearing body (1); the second oil passage (12) is annularly arranged inside the middle column of the bearing body (1) and is connected to each first oil passage (11); a plurality of third oil passages (13) are evenly arranged along the circumference of the middle column of the bearing body (1), and the central axis of the third oil passage (13) is parallel to the central axis of the bearing body (1), is connected to the second oil passage (12), and extends out of the conical platforms at both ends of the bearing body (1).

6. The main shaft sliding bearing for a wind turbine generator set according to claim 1, characterized in that: The oil port of the first oil passage (11) close to the outer surface of the bearing body (1) is defined as the oil inlet (4), the oil port of the first oil passage (11) close to the inner surface of the bearing body (1) is defined as the second oil outlet (8); and the oil ports at both ends of the third oil passage (13) close to the conical platform are defined as the first oil outlet (7).

7. The main shaft sliding bearing for a wind turbine generator set according to claim 4, characterized in that: A through hole is provided in the inner center line direction of the second connecting bolt (10) for communicating with the lubricating oil in the first oil passage (11) and delivering it to the working surface of the radial bush (2).

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