Passive yaw braking system of wind generating set

Abstract

The utility model discloses a passive yaw braking system of a wind generating set. The passive yaw braking system comprises a tower top flange, a yaw gear ring, a cabin bottom plate, a plurality of yaw brakes and a yaw driver, a yaw gear ring is arranged between the tower top flange and the cabin bottom plate, the yaw gear ring is fixedly connected with the tower top flange, the yaw brake is fixedly connected with the cabin bottom plate, and a small gear of the yaw drive is meshed with the yaw gear ring; a plurality of mounting grooves are formed in the upper surface of the yaw gear ring, and upper gaskets are arranged in the mounting grooves; a sinking groove is formed in the lower friction face of the cabin bottom plate, and a base plate making contact with the upper liner is detachably installed in the sinking groove. The yaw brake is provided with a lower gasket corresponding to the lower surface of the yaw gear ring and a side gasket corresponding to the side face of the yaw gear ring. The upper liner is convenient to mount and dismount, meanwhile, the use condition of the upper liner is convenient to check, the maintenance cost of the upper liner is reduced, and the maintenance time of the upper liner is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power, in particular to a passive yaw braking system of a wind turbine generator set. Background Art

[0002] The yaw system ensures that the wind turbine's impeller is always facing the wind. This position maximizes wind force, maximizing wind power utilization and improving power generation efficiency. Sliding yaw bearings are simpler in structure and lower in cost than rolling bearings. They can withstand greater loads and eliminate the need for hydraulic brakes and hydraulic systems, reducing the overall cost of the yaw system. Consequently, they are increasingly being adopted by megawatt-class wind turbines.

[0003] However, in the actual wind turbine industry, it has been found that the sliding bearings currently on the market have the following defects: 1. The upper gasket is installed in the groove of the cabin bottom plate and fits tightly with the yaw gear ring. When observing the use of the upper gasket, it is necessary to remove the brake and then remove the upper gasket for inspection. This process is cumbersome and inconvenient to inspect; 2. The upper gasket is pressed tightly against the yaw gear ring by the cabin bottom plate. It is necessary to remove the brake and then use a jack to lift the cabin bottom plate before replacing the upper gasket, which is laborious and time-consuming; 3. The upper gasket is installed on the cabin bottom plate and rotates with the cabin bottom plate. The center of gravity of the wind turbine cabin is often biased toward the wind rotor side, so that the upper gasket close to the wind rotor side is subjected to much greater pressure than the upper gasket on other sides, resulting in uneven wear of the upper gasket, reducing the overall service life of the upper gasket, resulting in uneven load on the yaw system and damage to the yaw gear. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a passive yaw braking system for a wind turbine generator set.

[0005] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0006] The passive yaw braking system of a wind turbine generator set includes a tower top flange, a yaw gear ring, a nacelle bottom plate, multiple yaw brakes and a yaw drive; a yaw gear ring is provided between the tower top flange and the nacelle bottom plate, the yaw gear ring is fixedly connected to the tower top flange, the yaw brake is fixedly connected to the nacelle bottom plate, and the small gear of the yaw drive is engaged with the yaw gear ring; the upper surface of the yaw gear ring is provided with multiple mounting grooves, and upper pads are provided in the mounting grooves; the lower friction surface of the nacelle bottom plate is provided with a sink groove, and a pad in contact with the upper pad is detachably installed in the sink groove; the yaw brake is provided with a lower pad corresponding to the lower surface of the yaw gear ring and a side pad corresponding to the side of the yaw gear ring.

[0007] Furthermore, a plurality of first threaded holes are provided on the cabin bottom plate, one end of the screw passes through the first threaded hole and abuts against the backing plate, and the other end is fixed to the cabin bottom plate through a nut.

[0008] Furthermore, a baffle abutting against the backing plate is provided on the inner bottom of the cabin bottom plate, and the baffle is connected to the cabin bottom plate by bolts.

[0009] Furthermore, a lubrication hole is provided on the yaw gear ring, and a lubrication groove connected to the lubrication hole is provided on the upper liner.

[0010] Furthermore, the lower surface of the backing plate is flush with the lower friction surface of the cabin bottom plate.

[0011] Furthermore, a groove penetrating through the inner ring of the yaw gear is provided on the upper surface of the yaw gear ring.

[0012] Furthermore, a second threaded hole is formed on one side of the backing plate close to the groove.

[0013] Furthermore, a third threaded hole is formed on one side of the upper gasket close to the groove. Beneficial effects

[0014] 1. The utility model provides a plurality of mounting grooves on the upper surface of the yaw gear ring, provides a recessed groove on the lower surface of the cabin bottom plate, arranges an upper liner in the mounting groove, and provides a detachable mounting pad in the recessed groove to support the upper liner, so that the upper liner is easy to install and remove, and the use of the upper liner is easy to check, thereby reducing the maintenance cost and time of the upper liner.

[0015] 2. During yaw, the position of the upper liner and the cabin bottom plate changes, causing the pressure, braking force and wear rate of each upper liner to alternate, resulting in more uniform wear, thereby increasing the overall service life of the upper liner and reducing damage to yaw components caused by uneven wear of the upper liner.

[0016] 3. This new type of device rotates the cabin bottom plate through yaw drive, so that the relative position of the upper liner and the cabin bottom plate changes, so that each upper liner can be aligned with the sink groove. By removing the baffle and the pad, the wear condition of the upper liner can be directly observed and the upper liner can be directly replaced. During maintenance, there is no need to use a jack to lift the heavy cabin, avoiding the risk of damage to the cabin by the jack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a partial structural diagram of a preferred embodiment of the utility model;

[0018] Figure 2 for Figure 1 Sectional view along AA;

[0019] Figure 3 for Figure 1 Cross-sectional view along BB;

[0020] In the figure: tower top flange 1, yaw gear ring 2, nacelle bottom plate 3, screw 4, pad 5, upper gasket 6, baffle 7, yaw brake 8, yaw drive 9, lubrication hole 21, groove 22, mounting groove 23, lower friction surface 31, countersunk groove 32, first threaded hole 33, nut 41, second threaded hole 51, lubrication groove 61, third threaded hole 62, bolt 71, lower gasket 81, side gasket 82, pinion 91. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] Example: Figures 1 to 3 As shown, the passive yaw braking system of the wind turbine generator set includes a tower top flange 1, a yaw ring gear 2, a nacelle bottom plate 3, multiple yaw brakes 8 and a yaw drive 9; a yaw ring gear 2 is provided between the tower top flange 1 and the nacelle bottom plate 3, the yaw ring gear 2 is fixedly connected to the tower top flange 1, the yaw brake 8 is fixedly connected to the nacelle bottom plate 3, and the pinion 91 of the yaw drive 9 is engaged with the yaw ring gear 2; a plurality of mounting grooves 23 are provided on the upper surface of the yaw ring gear 2, and an upper gasket 6 is provided in the mounting groove 23; a sinking groove 32 is provided on the lower friction surface 31 of the nacelle bottom plate 3, and a pad 5 in contact with the upper gasket 6 is detachably installed in the sinking groove 32; a lower gasket 81 corresponding to the lower surface of the yaw ring gear 2 and a side gasket 82 corresponding to the side of the yaw ring gear 2 are provided on the yaw brake 8. Preferably, the sinking groove 32 is provided at a position with lower pressure on the nacelle bottom plate 3.

[0023] The yaw ring gear 2, the nacelle bottom plate 3, the upper pad 6, the lower pad 81 and the side pad 82 together constitute a sliding yaw bearing. The pinion 91 of the yaw drive 9 engages with the yaw ring gear 2 to realize the driving of the yaw bearing by the yaw drive 9, thereby rotating the nacelle bottom plate 3 to realize the yaw action.

[0024] In this embodiment, a plurality of first threaded holes 33 are provided on the cabin bottom plate 3, one end of the screw 4 passes through the first threaded hole 33 and abuts against the pad 5, and the other end is fixed to the cabin bottom plate 3 by a nut 41. This design can facilitate the installation and adjustment of the pad 5, and the screw 4 is prevented from loosening by the nut 41. When the wind turbine is working normally, the pressure of the cabin bottom plate 3 is transmitted to the upper pad 6 through the lower friction surface 31, so that the pad 5 and the lower friction surface 31 respectively rub against the upper pad 6 to generate braking force, thereby braking the cabin bottom plate 3. When yaw, the yaw drive 9 drives the sliding yaw bearing, so that the pad 5 and the lower friction surface 31 respectively slide relative to the upper pad 6, thereby realizing yaw action; loosening the nut 41 and the screw 4 can remove the pressure on the upper pad 6, making it easy to remove the pad 5.

[0025] In this embodiment, a baffle 7 is provided on the inner bottom of the cabin bottom plate 3 to abut against the backing plate 5. The baffle 7 is connected to the cabin bottom plate 3 by bolts 71. The provision of the baffle 7 improves the stability of the installation of the backing plate 5.

[0026] In this embodiment, a lubrication hole 21 is provided on the yaw gear ring 2, and a lubrication groove 61 connected to the lubrication hole 21 is provided on the upper liner 6. The lubricating oil in the lubrication hole 21 can enter the lubrication groove 61 to keep the friction surfaces of the upper liner 6 and the pad 5 lubricated.

[0027] In this embodiment, the lower surface of the backing plate 5 is flush with the lower friction surface 31 of the cabin bottom plate 3 .

[0028] In this embodiment, a groove 22 penetrating through the inner ring of the yaw gear ring 2 is further formed on the upper surface of the yaw gear ring 2 .

[0029] In order to facilitate the disassembly and assembly of the pad 5 in the sink 32, a second threaded hole 51 is opened on the side of the pad 5 close to the cutting groove 22. When the pad 5 needs to be removed, the nut 41 and the screw 4 are loosened, and the screw is inserted through the second threaded hole 51 to pull out the pad 5.

[0030] In order to facilitate the disassembly and assembly of the upper gasket 6 in the installation groove 23, a third threaded hole 62 is opened on the side of the upper gasket 6 close to the cutting groove 22. When the upper gasket 6 needs to be removed, the nut 41 and the screw 4 are loosened to release the pressure on the upper gasket 6. The screw is inserted through the third threaded hole 62 to pull out the upper gasket 6.

[0031] Working principle of the utility model: when the wind turbine is operating normally and not yawed, the lower friction surface 31 of the nacelle bottom plate 3 and the pad 5 press the upper pad 6 tightly to provide braking force for the wind turbine; because the center of gravity of the nacelle bottom plate 3 deviates from the yaw rotation center, the pressure generated by the nacelle bottom plate 3 on each upper pad 6 is different. When the wind turbine yaws, the yaw drive 9 drives the nacelle bottom plate 3 and the yaw brake 8 to rotate relative to the yaw gear ring 2. When the wind turbine needs to be locked facing the wind direction, the yaw drive stops rotating, and the yaw brake 8 provides friction to brake the nacelle bottom plate 3, thereby stopping the rotation of the nacelle bottom plate 3. The pressure of the nacelle on each upper pad 6 is different, and the upper pad 6 near the hub is affected. The pressure is maximum, and the relative position of the upper liner 6 and the cabin bottom plate 3 changes during the yaw process, thereby changing the pressure of the upper liner 6, and then making the wear of the upper liner 6 uniform; when the upper liner 6 needs to be replaced or inspected, the yaw action is controlled to align the mounting groove 23 with the sink groove 32, and the baffle 7 is removed, the nut 41 and the screw 4 are loosened, and the pad 5 is taken out, and the surface condition of the upper liner 6 can be directly observed; when the upper liner 6 needs to be replaced, the mounting groove 23 and the sink groove 32 are aligned through the yaw action, the nut 41 and the screw 4 are loosened, and the screw is screwed into the third threaded hole 62, and the upper liner 6 is pulled out along the sink groove 32 at the mounting groove 23, and the upper liner 6 can be taken out for replacement.

[0032] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0033] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A passive yaw braking system for a wind turbine generator, comprising a tower top flange (1), a yaw gear ring (2), a cabin bottom plate (3), a plurality of yaw brakes (8) and a yaw drive (9); a yaw gear ring (2) is provided between the tower top flange (1) and the cabin bottom plate (3), the yaw gear ring (2) is fixedly connected to the tower top flange (1), the yaw brake (8) is fixedly connected to the cabin bottom plate (3), and a pinion (91) of the yaw drive (9) is meshed with the yaw gear ring (2); and the system is characterized in that: The upper surface of the yaw gear ring (2) is provided with a plurality of mounting grooves (23), and an upper pad (6) is provided in the mounting grooves (23); a lower friction surface (31) of the cabin bottom plate (3) is provided with a sinking groove (32), and a pad (5) in contact with the upper pad (6) is detachably installed in the sinking groove (32); and a lower pad (81) corresponding to the lower surface of the yaw gear ring (2) and a side pad (82) corresponding to the side of the yaw gear ring (2) are provided on the yaw brake (8).

2. The passive yaw braking system for a wind turbine generator set according to claim 1, characterized in that: A plurality of first threaded holes (33) are provided on the cabin bottom plate (3); one end of the screw (4) passes through the first threaded hole (33) and abuts against the backing plate (5); and the other end is fixed to the cabin bottom plate (3) via a nut (41).

3. The passive yaw braking system for a wind turbine generator set according to claim 1, characterized in that: The inner bottom of the cabin bottom plate (3) is provided with a baffle (7) that abuts against the pad (5), and the baffle (7) is connected to the cabin bottom plate (3) via bolts (71).

4. The passive yaw braking system for a wind turbine generator set according to claim 1, characterized in that: A lubrication hole (21) is provided on the yaw gear ring (2), and a lubrication groove (61) communicating with the lubrication hole (21) is provided on the upper liner (6).

5. The passive yaw braking system for a wind turbine generator set according to claim 1, characterized in that: The lower surface of the pad (5) is flush with the lower friction surface (31) of the cabin bottom plate (3).

6. The passive yaw braking system for a wind turbine generator set according to claim 1, characterized in that: The upper surface of the yaw gear ring (2) is also provided with a slot (22) penetrating the inner ring thereof.

7. The passive yaw braking system for a wind turbine generator set according to claim 6, characterized in that: A second threaded hole (51) is formed on one side of the backing plate (5) close to the slot (22).

8. The passive yaw braking system for a wind turbine generator set according to claim 6, characterized in that: A third threaded hole (62) is formed on one side of the upper liner (6) close to the slot (22).

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