Wind power main shaft transmission mechanism

Abstract

The utility model relates to the technical field of wind power, in particular to a wind power main shaft transmission mechanism which comprises a wind power main shaft, a bearing seat is sleeved on the outer wall of the wind power main shaft, a first end cover is installed at the front end of the bearing seat, and a second end cover is installed at the rear end of the bearing seat. A first wear-resistant layer is arranged on the end face, making contact with the wind power main shaft, of the first end cover, a second wear-resistant layer is arranged on the end face, making contact with the wind power main shaft, of the second end cover, and the first wear-resistant layer and the second wear-resistant layer are both in sliding fit with the wind power main shaft. The main shaft and the bearing seat are stably connected through the first end cover and the second end cover, the wind power main shaft and the bearing seat are designed to be of an integrated installation structure, the internal structure is optimized, compared with a rolling bearing, the number of parts is reduced, the assembly steps of a wind turbine generator are simplified, and the assembly efficiency is improved. The problem that the production and assembly efficiency of the wind turbine generator is too low is solved, and therefore the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power, and specifically discloses a wind power main shaft transmission mechanism. Background Art

[0002] As a non-polluting renewable energy source, wind energy accounts for an increasing proportion in my country's energy system. As the wind power industry enters the stage of market competition, in order to effectively reduce the levelized cost of electricity and maintain competitiveness, the capacity of wind turbines is continuously increasing. At present, the wind power industry is developing in the direction of large-scale development. The wind turbine main shaft is a component that transmits torque. It is an important component connected between the hub and the gearbox inside the wind turbine. The wind turbine main shaft is generally equipped with a bearing seat, which is the supporting structure of the wind turbine main shaft.

[0003] The utility model patent with authorization announcement number: CN218644648U discloses a low-heat wind turbine main shaft bearing, including an inner ring and an outer ring, between which two rows of thrust rollers bearing axial loads and one row of radial rollers bearing radial loads are installed, and the thrust rollers are all conical, and each row of thrust rollers meets: the center line of the thrust roller, the contact line between the thrust roller and the corresponding thrust inner ring raceway, and the contact line between the thrust roller and the corresponding thrust outer ring raceway all intersect at the same point on the bearing rotation axis.

[0004] The above-mentioned publicly disclosed patent technology is basically similar to the structure and function of the wind turbine main shaft on the market, and most of them use rolling bearings; but with the continuous increase in the capacity of a single wind turbine unit, the wind swept area of ​​its blades is also gradually increasing, which gradually increases the height of the tower, and requires the transmission system of the wind turbine to bear more stringent loads; therefore, in order to adapt to the development trend of large-scale wind turbines, it is necessary to continuously increase the load conditions and increase the size and weight of the bearings. The increase in the size and weight of the bearings has placed higher requirements on the difficulty and cost of production and manufacturing; it can be seen that when rolling bearings are used for installation in large wind turbines, due to the complex structure of the rolling bearings, the installation steps of the wind turbine are relatively cumbersome, requiring a lot of manpower and material resources, and it is difficult to ensure the production and assembly efficiency of the wind turbine. Utility Model Content

[0005] Aiming at the problem that the production and assembly efficiency of current large-scale wind turbines is too low due to the use of rolling bearings, the utility model provides a wind turbine main shaft transmission mechanism.

[0006] To solve the above problems, the utility model provides the following technical solutions:

[0007] A wind turbine main shaft transmission mechanism comprises a wind turbine main shaft, wherein a bearing seat is mounted on the outer wall of the wind turbine main shaft, a first end cover is mounted on the front end of the bearing seat, and a second end cover is mounted on the rear end of the bearing seat, a first wear-resistant layer is arranged on the end surface of the first end cover in contact with the wind turbine main shaft, and a second wear-resistant layer is arranged on the end surface of the second end cover in contact with the wind turbine main shaft, and both the first wear-resistant layer and the second wear-resistant layer are slidably matched with the wind turbine main shaft.

[0008] Preferably, a connecting assembly is provided between the first end cover, the second end cover and the bearing seat, and the connecting assembly includes bolts and adjustment gaskets.

[0009] Preferably, a conical portion is provided on the front end face of the wind turbine main shaft, and a protruding straight portion is provided on the rear end face of the wind turbine main shaft, a fourth wear-resistant layer is provided on the outer sides of the conical portion and the straight portion, a third wear-resistant layer is provided at the front and rear ends of the bearing seat, and the first wear-resistant layer, the second wear-resistant layer and the third wear-resistant layer are all slidably matched with the fourth wear-resistant layer.

[0010] Preferably, a hollow groove is provided in the conical portion, cavities are provided on both sides of the conical portion and the straight portion, and a sealing strip is installed outside the cavity.

[0011] Preferably, an inner cavity is provided between the wind turbine main shaft and the bearing seat.

[0012] Preferably, a distance sensor is provided between the first wear-resistant layer and the fourth wear-resistant layer.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model connects the main shaft and the bearing seat firmly through the first end cover and the second end cover, designs the wind turbine main shaft and the bearing seat into an integrated installation structure, optimizes the internal structure, reduces the number of parts compared with rolling bearings, simplifies the assembly steps of the wind turbine, solves the problem of low production and assembly efficiency of the wind turbine, and thus improves production efficiency;

[0015] 2. The utility model can effectively reduce the rigidity of the inner ring of the bearing seat by designing the material-removed structural area of ​​the empty slot and the cavity, so as to adapt to the changing wind load, make the stress distribution inside the bearing seat more uniform, and improve the service life of the bearing seat. At the same time, it also reduces the overall weight of the wind turbine main shaft and improves economic competitiveness;

[0016] 3. The utility model is designed with a tapered portion and a straight portion, so that the installation structure of the first end cover and the second end cover is more convenient and simple. The matching structure can be quickly disassembled during maintenance of the wind turbine, so that the bearing seat can be inspected and maintained, thereby greatly saving maintenance time and maintenance costs;

[0017] 4. The utility model can monitor the gap between the first wear-resistant layer and the fourth wear-resistant layer in real time by setting a distance sensor, so that the gap is always kept within a predetermined range, thereby ensuring the rationality of the stress distribution inside the bearing seat and greatly eliminating safety hazards. Therefore, it has a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the utility model, the following will briefly introduce the drawings required for the description. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0020] Figure 2 for Figure 1 A magnified view of the structure at center;

[0021] Figure 3 for Figure 1 A magnified view of the structure at B in the middle;

[0022] Figure 4 This is a schematic diagram of the wind turbine main shaft structure of the utility model;

[0023] Figure 5 for Figure 4 A magnified view of the structure at C in the middle;

[0024] Figure 6 for Figure 4 A magnified view of the structure at D in the middle;

[0025] Figure 7 This is a schematic diagram of the installation structure of the distance sensor of the utility model;

[0026] In the figure: 1. wind turbine main shaft, 2. bearing seat, 3. first end cover, 4. second end cover, 5. first wear-resistant layer, 6. second wear-resistant layer, 7. bolts, 8. adjustment gasket, 9. tapered part, 10. straight part, 11. fourth wear-resistant layer, 12. third wear-resistant layer, 13. empty groove, 14. cavity, 15. sealing strip, 16. inner cavity, 17. distance sensor. DETAILED DESCRIPTION

[0027] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0028] This specific implementation provides a wind turbine main shaft transmission mechanism, such as Figure 1-Figure 7 As shown, it includes a wind turbine main shaft 1, and a bearing seat 2 is mounted on the outer wall of the wind turbine main shaft 1. A tapered portion 9 is arranged on the front end face of the wind turbine main shaft 1, and the tapered portion 9 is a double-row conical structure. A hollow groove 13 is arranged in the tapered portion 9, and both sides of the hollow groove 13 are conical structures with the same cone angle and symmetry with each other; a protruding straight portion 10 is arranged on the rear end face of the wind turbine main shaft 1, and the straight portion 10 is a two-half structure separated in the diameter direction; the front end of the bearing seat 2 is provided with an inclined surface adapted to the shape of the tapered portion 9, and the rear end of the bearing seat 2 is provided with a straight surface adapted to the shape of the straight portion 10. By providing a conical portion 9 with a double-row conical structure, the radial load and axial load of the wind turbine main shaft 1 during operation can be effectively borne, making the working efficiency of the wind turbine main shaft 1 more stable; by providing a straight portion 10 with a two-half structure, the front end of the wind turbine main shaft 1 can be fitted with the bearing seat 2 to facilitate the assembly of the bearing seat 2; and the design structure of the straight portion 10 can facilitate maintenance and replacement during the operation of the wind turbine set, providing convenience for operators.

[0029] like Figure 2-Figure 3As shown, the front end of the bearing seat 2 is provided with a first end cover 3, the upper part of the first end cover 3 is in contact with the front end of the bearing seat 2, the lower part of the first end cover 3 is provided with an inclined surface, the inclined surface corresponds to the conical surface of the conical portion 9, the conical surface is provided with a first wear-resistant layer 5, the conical surface of the conical portion 9 is provided with a fourth wear-resistant layer 11, the first wear-resistant layer 5 and the fourth wear-resistant layer 11 are slidably matched, so that the first wear-resistant layer 5 can slide on the fourth wear-resistant layer 11. The rear end of the bearing seat 2 is provided with a second end cover 4, the upper part of the second end cover 4 is in contact with the rear end of the bearing seat 2, the lower part of the second end cover 4 is provided with a straight surface, the straight surface corresponds to the upper surface of the straight portion 10, the straight surface is provided with a second wear-resistant layer 6, the upper surface of the straight portion 10 is provided with a fourth wear-resistant layer 11 that is the same as the conical surface of the conical portion 9, the second wear-resistant layer 6 and the fourth wear-resistant layer 11 are slidably matched, so that the second wear-resistant layer 6 can slide on the fourth wear-resistant layer 11. The third wear-resistant layer 12 is provided on the inclined surface at the front end and the flat surface at the rear end of the bearing seat 2, and the third wear-resistant layer 12 is slidably matched with the fourth wear-resistant layer 11; under the sliding cooperation of the first wear-resistant layer 5, the second wear-resistant layer 6, the third wear-resistant layer 12 and the fourth wear-resistant layer 11, the bearing seat 2 can slide on the outer wall of the wind turbine main shaft 1. The first wear-resistant layer 5 and the second wear-resistant layer 6 are the main friction pairs between the wind turbine main shaft 1 and the bearing seat 2, and both can use softer materials, such as: copper-tin alloy, aluminum-tin alloy, PTFE (+ fabric), PEEK, etc.; the fourth wear-resistant layer 11 can use harder materials, such as: high-temperature alloy (containing graphite, molybdenum disulfide), DLC coating, WC coating, CrO, CrN coating, etc.

[0030] Among them, a connecting component is arranged between the first end cover 3, the second end cover 4 and the bearing seat 2, and the connecting component can fasten the first end cover 3 and the bearing seat 2, and the second end cover 4 and the bearing seat 2, so that the first end cover 3, the second end cover 4 and the bearing seat 2 form an integrated structure; the connecting component includes a bolt 7 and an adjusting gasket 8, and the bolt 7 is installed on the upper part of the first end cover 3 and the second end cover 4, and the adjusting gasket 8 is a supporting structure between the first end cover 3 and the bearing seat 2, and the second end cover 4 and the bearing seat 2. The bolt 7 passes through the first end cover 3 and the adjusting gasket 8 and is threadedly connected to the bearing seat 2, so that the first end cover 3, the adjusting gasket 8 and the bearing seat 2 are fastened together, and the bolt 7 passes through the second end cover 4 and the adjusting gasket 8 and is threadedly connected to the bearing seat 2, so that the second end cover 4, the adjusting gasket 8 and the bearing seat 2 are fastened together.

[0031] Among them, Figure 4-Figure 6As shown, symmetrical cavities 14 are provided on both sides of the conical portion 9 and the straight portion 10, and sealing strips 15 are installed on the outside of the cavity 14. The sealing strips 15 can be made of rubber material. The sealing strips 15 can seal the cavity 14 to prevent external dust from entering the cavity 14, thereby ensuring the cleanliness of the interior; the sealing strips 15 are sealing structures, and other forms of seals can also be used, for example: using a seal with two inner and outer seals, the inner side of which adopts a labyrinth seal and the outer side adopts a contact seal; an inner cavity 16 is provided between the wind turbine main shaft 1 and the bearing seat 2. The cavity 14 and the slot 13 are both material-removed structural areas on the wind turbine main shaft 1. Since the load borne by the bearing seat 2 changes all the time during the operation of the wind turbine set, the stiffness of the inner ring of the bearing seat 2 can be effectively reduced and the deformation of the inner ring can be increased by designing the material-removed structural areas of the cavity 14 and the slot 13, so as to adapt to the constantly changing wind load; and this structure can make the stress distribution inside the bearing seat 2 more uniform, so as to reduce the wear of the first wear-resistant layer 5, the second wear-resistant layer 6, the third wear-resistant layer 12, and the fourth wear-resistant layer 11, and increase the service life of the bearing seat 2, while also reducing the overall weight of the wind turbine main shaft 1 and improving the economic competitiveness.

[0032] In addition, if Figure 7 As shown, a distance sensor 17 is arranged between the first wear-resistant layer 5 and the fourth wear-resistant layer 11, and the tail of the distance sensor 17 is embedded in the first end cover 3; the distance sensor 17 can measure the gap between the first wear-resistant layer 5 and the fourth wear-resistant layer 11, and the size of the gap can directly reflect the distance between the first end cover 3 and the tapered portion 9. If the distance measured by the distance sensor 17 does not match the predetermined data, the operator can replace the adjustment gasket 8 of different specifications to make the size of the gap meet the assembly standard, thereby ensuring that the gap between the bearing seat 2 and the wind turbine main shaft 1 is maintained in an appropriate range to avoid safety hazards.

[0033] Compared with the prior art, the utility model connects the main shaft 1 and the bearing seat 2 firmly through the first end cover 3 and the second end cover 4, designs the wind turbine main shaft 1 and the bearing seat 2 as an integrated installation structure, optimizes the internal structure, reduces the number of parts compared with rolling bearings, simplifies the assembly steps of the wind turbine set, solves the problem of low production and assembly efficiency of the wind turbine set, and thus improves production efficiency; and by designing the material-removed structural area of ​​the empty groove 13 and the cavity 14, the rigidity of the inner ring of the bearing seat 2 can be effectively reduced, thereby adapting to the constantly changing wind load, making the stress distribution inside the bearing seat 2 more uniform, and improving the service life of the bearing seat 2, while also reducing the wind turbine main shaft 1 The overall weight is reduced, thereby improving economic competitiveness; at the same time, the design structure of the tapered portion 9 and the straight portion 10 can make the installation structure of the first end cover 3 and the second end cover 4 more convenient and concise, and the matching structure can be quickly disassembled during maintenance of the wind turbine, so that the bearing seat 2 can be inspected and maintained, thereby greatly saving maintenance time and maintenance costs; finally, by arranging the distance sensor 17, the gap between the first wear-resistant layer 5 and the fourth wear-resistant layer 11 can be monitored in real time, so that the gap is always kept within a predetermined range, thereby ensuring the rationality of the stress distribution inside the bearing seat 2 and greatly eliminating safety hazards; in summary, the utility model has a very broad application prospect.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wind turbine main shaft transmission mechanism, comprising a wind turbine main shaft (1), characterized in that: A bearing seat (2) is mounted on the outer wall of the wind turbine main shaft (1); a first end cover (3) is mounted on the front end of the bearing seat (2); a second end cover (4) is mounted on the rear end of the bearing seat (2); a first wear-resistant layer (5) is arranged on the end surface of the first end cover (3) in contact with the wind turbine main shaft (1); a second wear-resistant layer (6) is arranged on the end surface of the second end cover (4) in contact with the wind turbine main shaft (1); the first wear-resistant layer (5) and the second wear-resistant layer (6) are both slidably matched with the wind turbine main shaft (1).

2. A wind turbine main shaft transmission mechanism according to claim 1, characterized in that: A connecting assembly is provided between the first end cover (3), the second end cover (4) and the bearing seat (2), and the connecting assembly comprises a bolt (7) and an adjusting gasket (8).

3. A wind turbine main shaft transmission mechanism according to claim 1, characterized in that: A conical portion (9) is provided on the front end face of the wind turbine main shaft (1), a protruding straight portion (10) is provided on the rear end face of the wind turbine main shaft (1), a fourth wear-resistant layer (11) is provided on the outer sides of the conical portion (9) and the straight portion (10), a third wear-resistant layer (12) is provided on the front and rear ends of the bearing seat (2), and the first wear-resistant layer (5), the second wear-resistant layer (6), and the third wear-resistant layer (12) are all slidably matched with the fourth wear-resistant layer (11).

4. A wind turbine main shaft transmission mechanism according to claim 3, characterized in that: A hollow groove (13) is provided in the conical portion (9), cavities (14) are provided on both sides of the conical portion (9) and the straight portion (10), and a sealing strip (15) is installed outside the cavity (14).

5. A wind turbine main shaft transmission mechanism according to claim 1, characterized in that: An inner cavity (16) is provided between the wind turbine main shaft (1) and the bearing seat (2).

6. A wind turbine main shaft transmission mechanism according to claim 1, characterized in that: A distance sensor (17) is provided between the first wear-resistant layer (5) and the fourth wear-resistant layer (11).

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