A slewing bearing device for a wind turbine pitch actuator

Abstract

The present invention discloses a slewing support device for a variable pitch actuator of a wind turbine, which at least includes a slewing support, a base, a sliding member, and a pressure cover. The slewing support at least includes a pin hole, a supporting annular surface, and a rotating shaft, wherein the pin hole supports the variable pitch actuator; the base is provided with a rotating shaft hole and embedded with a rotating shaft bushing, and two supporting surfaces are provided at both ends of the rotating shaft hole; the rotating shaft and the rotating shaft bushing constitute a slewing pair; the sliding member is respectively arranged between the supporting annular surface and one supporting surface and between the other supporting surface and the pressure cover; the pressure cover is fixed to the rotating shaft end face of the slewing support by a threaded connection. The slewing support device of the present invention greatly improves the supporting capacity of the variable pitch actuator with linear reciprocating motion, reduces the wear of the slewing support, improves the reliability of the device, and reduces the maintenance workload through reasonable design of resisting bending moment and lateral force; at the same time, it reduces the supporting capacity requirements of the hub component, and reduces the manufacturing cost and operation and maintenance cost of the variable pitch functional component.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a slewing bearing device of a variable pitch actuator of a wind turbine set. Background Art

[0002] Wind power is the most valuable and commercially promising power generation method in the field of renewable energy. Available wind energy is widely distributed around the world and has huge reserves. In the field of wind power generation, variable pitch wind turbines have replaced fixed pitch wind turbines to become the mainstream of wind turbines. The variable pitch system, as an important executive structure for changing the blade pitch angle to adjust the wind turbine power generation and wind load control, plays an important role in the operation of wind turbines. The variable pitch actuator, as the variable pitch drive element in the variable pitch system, is particularly important for its rotary drive device.

[0003] The driving device of the variable pitch actuator proposed in CN107587975A has a front end of the variable pitch actuator hydraulic cylinder connected to the web through a transfer component, and a rear end of the variable pitch actuator hydraulic cylinder connected to a lifting lug cast on the inner side of the wind turbine hub through a pin shaft, and a crank connecting rod mechanism is formed by the variable pitch actuator hydraulic cylinder, the web and the hub to achieve variable pitch of the wind turbine blades. Although its structure is simple, the lifting lug cast on the hub directly bears the alternating load from the variable pitch actuator hydraulic cylinder when the blade is opened and the blade is smoothed, which causes fatigue problems. In the long-term operation of the wind turbine, once it is damaged or has other faults, the entire hub may need to be replaced, which not only increases the difficulty of maintenance but also increases the maintenance cost.

[0004] The driving device of the variable pitch actuator of the wind turbine proposed in CN201225233Y, the middle part of the hydraulic cylinder of the variable pitch actuator is hinged on the hydraulic cylinder seat by a pin shaft, the hydraulic cylinder seat is connected to the wheel hub; the piston rod slidably connected to the hydraulic cylinder of the variable pitch actuator is hinged to the connecting shaft, the connecting shaft is installed on the connecting seat, and the connecting seat is connected to the root of the blade. When the hydraulic cylinder of the variable pitch actuator works linearly and reciprocatingly, the piston rod drives the root of the blade to rotate around its axis through the connecting shaft to achieve the variable pitch of the blade of the wind turbine. Although the driving device of the variable pitch actuator can accurately complete the variable pitch of the blade, its structure is complex and the maintenance cost is high. At the same time, the connecting parts of the hydraulic cylinder seat and the wheel hub produce fatigue problems due to the alternating load from the hydraulic cylinder during the linear reciprocating motion when the paddle is opened and the paddle is smoothed, which is easy to cause failures and safety hazards. Secondly, the connecting bolts of the connecting seat and the root of the blade are more likely to produce fatigue problems during the long-term operation of the wind turbine because they bear the alternating overturning torque from the piston rod during the linear reciprocating motion, thereby reducing the reliability of the driving device and increasing its maintenance cost.

[0005] With the increase in the capacity of modern wind turbines and the increase in the size of blades, the driving force required for blade pitch change also increases accordingly. At the same time, due to the increase in the capacity of wind turbines, the size of various wind turbine components such as the hub also increases accordingly. It is no longer possible to achieve the pitch change of wind turbine blades by simply enlarging the structural size of the drive device of the pitch actuator in the prior art. This will not only reduce its economy, but also increase the load-bearing requirements for other components of the wind turbine connected thereto, such as the hub, which will not only increase the manufacturing cost and operation and maintenance cost, but also greatly reduce the reliability of the unit operation. Summary of the invention

[0006] In view of this, the present invention proposes a slewing bearing device for a pitch actuator. The slewing bearing device has a simple structure and is easy to maintain. It also increases the service life of the pitch functional components, reduces maintenance costs, and improves the reliability of the wind turbine operation by reasonably resisting the bending moment load and lateral force load from the linear reciprocating motion of the pitch actuator.

[0007] The present invention is achieved through the following technical solutions.

[0008] A first aspect of the present invention provides a slewing support device for a pitch actuator, which is characterized by comprising at least a slewing support, a base, a sliding member and a pressure cover.

[0009] Furthermore, the slewing bracket at least includes a pin shaft hole, a supporting annular surface and a rotating shaft, and the slewing bracket is connected to the pitch actuator through the pin shaft hole.

[0010] Furthermore, there are two pin holes, each of which is provided with a pin bushing, and the pin bushing is used to support a pin installed on the pitch actuator, and the pitch actuator can swing slightly relative to the slewing bracket.

[0011] Furthermore, the axis of the pin shaft hole is perpendicular to the linear reciprocating motion direction of the pitch actuator.

[0012] Furthermore, the axis of the rotating shaft of the swivel bracket is perpendicular to the axis of the pin shaft hole; and a threaded hole is provided on the end surface of the rotating shaft.

[0013] Furthermore, the base is provided with a rotating shaft hole, the rotating shaft hole is provided with a rotating shaft bushing, and both ends of the rotating shaft hole are provided with a first supporting surface and a second supporting surface.

[0014] Furthermore, the rotating shaft bushing of the rotating shaft hole and the rotating shaft of the rotating bracket form a rotating pair, and the rotating bracket can perform a rotating motion relative to the base.

[0015] Further, the sliding member includes a first sliding member and a second sliding member, the first sliding member is fixed on the supporting ring surface of the rotating bracket, the second sliding member is fixed on the pressure cover, the first sliding member slides relative to the first supporting surface of the base, and the second sliding member slides relative to the second supporting surface of the base; or the first sliding member is fixed on the first supporting surface of the base, the second sliding member is fixed on the second supporting surface of the base, the first sliding member slides relative to the supporting ring surface of the rotating bracket, and the second sliding member slides relative to the pressure cover.

[0016] Furthermore, the first sliding member and the second sliding member are segmented fan ring structures, or integral circular ring structures.

[0017] Furthermore, the first sliding member and the sliding member are both made of non-metallic materials that are resistant to pressure and wear.

[0018] Furthermore, the gland is provided with a through hole, and the through hole is connected to the threaded hole on the end surface of the rotating shaft by bolts, and when the rotating bracket rotates relative to the base, the gland rotates synchronously with the rotating bracket.

[0019] Furthermore, the base and the hub of the wind turbine generator set are cast as one piece, or the base and the hub are fixedly connected.

[0020] On the other hand, a wind turbine generator set is provided, which includes the slewing support device of the pitch actuator described in the first aspect.

[0021] The beneficial effects of the present invention are as follows: through reasonable design of resisting bending moment loads and lateral force loads, the supporting capacity of the slewing bearing device for the linear reciprocating pitch actuator is greatly improved, the wear of the slewing bearing is reduced, the reliability of the device is improved, and the maintenance workload is reduced; at the same time, the supporting capacity requirements of the hub components are reduced, and the manufacturing cost and operation and maintenance cost of the pitch functional components are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a slewing bearing device of a wind turbine pitch actuator according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a swivel bracket according to an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of a pitch actuator according to an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of a base according to an embodiment of the present invention;

[0026] Figure 5 A cross-sectional view of a slewing bearing device of a wind turbine pitch actuator according to an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of a sliding member according to an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of a gland according to an embodiment of the present invention;

[0029] Figure 8 It is an overall schematic diagram of the pitch actuator and the hub according to an embodiment of the present invention.

[0030] Description of Figure Numbers:

[0031] 1. Rotating bracket; 1.1a (1.1b), pin hole; 1.2, supporting annular surface; 1.3, rotating shaft; 1.4, end surface of rotating shaft; 1.5, axis of pin hole; 1.6, axis of rotating shaft; 1.7a (1.7b), pin bushing; 1.8, first fixing groove; 1.9, threaded hole;

[0032] 2. Base; 2.1. Rotating shaft hole; 2.2. Rotating shaft bushing; 2.3. First supporting surface; 2.4. Second supporting surface;

[0033] 3. Sliding member; 3.1. First sliding member; 3.2. Second sliding member;

[0034] 4. gland; 4.1. second fixing groove; 4.2. through hole;

[0035] 5. Pitch actuator; 5.1a (5.1b), pin of the pitch actuator; 5.2, trajectory of the linear reciprocating motion direction of the pitch actuator;

[0036] 6. Wheel hub; 7. Bolts.

[0037] It is worth noting that the above drawings are used to illustrate the features of the present invention, and are not intended to show any actual structure or reflect the size, relative proportion and other detailed information of various components. In order to more clearly show the principle of the present invention and to avoid unnecessary details that make the principle of the present invention unclear, the examples in the figures have been simplified. These illustrations will not cause inconvenience to technicians in the relevant fields in understanding the present invention, and the actual slewing bearing device of the pitch actuator may include more components. DETAILED DESCRIPTION

[0038] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the embodiment of the present invention is fully described below in conjunction with the relevant drawings of the embodiment of the present invention. This patent describes only a part of the embodiments, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] As attached Figure 1 As shown, a slewing support device of a wind turbine pitch actuator at least comprises: a slewing support 1, a base 2, a sliding member 3, and a pressure cover 4.

[0040] As attached Figure 2 As shown, the slewing bracket 1 includes at least two pin holes, namely, a pin hole 1.1a and a pin hole 1.1b, a supporting annular surface 1.2 and a rotating shaft 1.3; the pin hole 1.1a and the pin hole 1.1b are coaxial and have the same aperture size, and the two pin holes (1.1a and 1.1b) are both embedded with pin bushings (1.7a and 1.7b), and the axis 1.5 of the two pin holes (1.1a and 1.1b) is perpendicular to the trajectory line 5.2 of the linear reciprocating motion direction of the pitch actuator 5; the axis 1.6 of the rotating shaft 1.3 of the slewing bracket 1 is perpendicular to the axis 1.5 of the two pin holes (1.1a and 1.1b) of the slewing bracket 1.

[0041] As attached Figure 3 As shown, a pin 5.1a and a pin 5.1b are fixedly mounted on the pitch actuator 5. The pin 5.1a and the pin 5.1b are located on both sides of the pitch actuator 5, and the pin 5.1a and the pin 5.1b are coaxial and have the same size.

[0042] As attached Figure 5 As shown, the pin bushing 1.7a in the pin hole 1.1a of the slewing bracket 1 cooperates with the pin 5.1a fixedly mounted on the pitch actuator 5 to form a slewing pair, and at the same time, the pin bushing 1.7b in the pin hole 1.1b cooperates with the pin 5.1b fixedly mounted on the pitch actuator 5 to form a slewing pair. The slewing bracket 1 supports the pitch actuator 5 by supporting the pins (5.1a and 5.1b) through the pin bushings (1.7a and 1.7b) in the pin holes (1.1a and 1.1b). When the wind turbine is working, the pitch actuator 5 swings relative to the slewing bracket 1 around the axis 1.5 of the pin hole (1.1a and 1.1b) through the slewing pair formed by the pin bushing 1.7a and the pin 5.1a and the slewing pair formed by the pin bushing 1.7b and the pin 5.1b, so as to reduce the wear of the pitch actuator 5 caused by the deformation of other components in the pitch system connected to the pitch actuator 5 when the pitch actuator 5 works in a linear reciprocating manner, thereby increasing the service life of the pitch actuator 5 and reducing the maintenance cost.

[0043] As attached Figure 4As shown, the base 2 is provided with a shaft hole 2.1, a shaft bushing 2.2 is embedded in the shaft hole 2.1, and a first supporting surface 2.3 and a second supporting surface 2.4 are provided at both ends of the shaft hole 2.1. Figure 5 As shown, the shaft bushing 2.2 in the shaft hole 2.1 of the base 2 cooperates with the shaft 1.3 of the swivel bracket 1 and forms a rotating pair. When the pitch actuator 5 is working, the swivel bracket 1 rotates relative to the base 2 within a certain range around the axis 1.6 of the shaft 1.3 through the rotating pair formed by the shaft bushing 2.2 in the shaft hole 2.1 of the base 2 and the shaft 1.3, and drives the blades of several wind turbine groups to rotate through other components in the pitch system to achieve the pitch change of the wind turbine blades. The shaft bushing 2.2 in the shaft hole 2.1 of the base 2 bears the lateral force load from the linear reciprocating operation of the pitch actuator 5 during the pitch change of the wind turbine blades, and the bending moment load from the linear reciprocating operation of the pitch actuator 5 during the pitch change of the wind turbine blades is borne by the sliding member 3.

[0044] As attached Figure 5 As shown, the sliding member 3 includes a first sliding member 3.1 and a second sliding member 3.2. The first sliding member 3.1 is arranged between the supporting annular surface 1.2 of the slewing support 1 and the first supporting surface 2.3 of the base 2, and the second sliding member 3.2 is arranged between the second supporting surface 2.4 of the base 2 and the gland 4. When the pitch actuator 5 works linearly and reciprocatingly, the first sliding member 3.1 and the second sliding member 3.2 form a force couple relationship in the structure, and the bending moment load from the pitch actuator 5 during linear reciprocating work is directly borne by the surface of the first sliding member 3.1 and the surface of the second sliding member 3.2, converting the bending moment load into a pressure load borne by the sliding member 3, avoiding the shaft bushing 2.2 in the shaft hole 2.1 of the base 2 from bearing the bending moment load, thereby improving the service life of the shaft bushing 2.2, and at the same time, because the first sliding member 3.1 and the second sliding member 3.2 are both non-metallic materials that are resistant to pressure and wear, they have strong bearing capacity and long service life, thereby improving the reliability of the entire slewing support device and reducing its maintenance cost.

[0045] As attached Figure 6 As shown, in this embodiment, the first sliding member 3.1 and the second sliding member 3.2 are integral circular ring structures, which are simple in structure and easy to maintain and operate. In addition, the first sliding member 3.1 and the second sliding member 3.2 can also be structures composed of segmented fan rings.

[0046] In the installation process of the specific embodiment, there are two installation and fixing schemes for the first sliding member 3.1 and the second sliding member 3.2: In the first scheme, a first fixing groove 1.8 is opened on the supporting ring surface 1.2 of the slewing bracket 1, a part of the first sliding member 3.1 is embedded in the first fixing groove 1.8, and the other part protrudes from the first fixing groove 1.8 and slides and rubs relative to the first supporting surface 2.3 of the base 2; Figure 7 As shown, a second fixing groove 4.1 is provided, a part of the second sliding member 3.2 is embedded in the second fixing groove 4.1, and the other part protrudes from the second fixing groove 4.1 and slides and rubs relative to the second supporting surface 2.4 of the base 2.

[0047] In the second scheme, the first fixed groove 1.8 is opened on the first supporting surface 2.3 of the base 2, a part of the first sliding member 3.1 is embedded in the first fixed groove 1.8, and the other part protrudes from the first supporting surface 2.3 of the base 2 and slides and rubs relative to the supporting annular surface 1.2 of the slewing bracket 1; the second fixed groove 4.1 is opened on the second supporting surface 2.4 of the base 2 in the same way as the first fixed groove 1.8, a part of the second sliding member 3.2 is embedded in the second fixed groove 4.1, and the other part protrudes from the second supporting surface 2.4 of the base 2 and slides and rubs relative to the pressure cover 4.

[0048] In this embodiment, as shown in the attached Figure 5 As shown, the first fixing groove 1.8 is opened on the supporting ring surface 1.2 of the swivel bracket 1, the second fixing groove 4.1 is opened on the pressure cover 4, the first sliding member 3.1 is fixed on the swivel bracket 1 and slides relative to the base 2, and the second sliding member 3.2 is fixed on the pressure cover 4 and slides relative to the base 2.

[0049] As attached Figure 2 As shown, the end surface 1.4 of the rotating shaft 1.3 of the swivel bracket 1 is provided with a threaded hole 1.9; Figure 7 As shown, the gland 4 is provided with a through hole 4.2. Figure 5 As shown, the through hole 4.2 on the gland 4 is fixedly connected with the threaded hole 1.9 on the end face 1.4 of the rotating shaft 1.3 of the slewing bracket 1 by the bolt 7. During the linear reciprocating operation of the pitch actuator 5, when the slewing bracket 1 rotates relative to the base 2 around the axis 1.6 of the rotating shaft 1.3, the gland 4 is fixedly connected with the slewing bracket 1 by the bolt 7, and the gland 4 will rotate relative to the base 2 around the axis 1.6 of the rotating shaft 1.3 of the slewing bracket 1 synchronously with the slewing bracket 1, so that the first sliding member 3.1 and the second sliding member 3.2 form a couple relationship when the pitch actuator 5 is linearly reciprocating, so as to jointly bear the bending moment load from the linear reciprocating motion of the pitch actuator 5.

[0050] In the further implementation process, the base 2 is fixedly connected to the hub 6 of the wind turbine. When the pitch actuator 5 is working, the first sliding member 3.1 and the second sliding member 3.2 bear the bending moment load from the pitch actuator 5 during linear reciprocating motion, and the shaft bushing 2.2 in the shaft hole 2.1 of the base 2 bears the lateral force load from the pitch actuator 5 during linear reciprocating motion, so that the load transfer is more reasonable, while improving the reliability of the slewing bearing device, reducing the support capacity requirements of the hub component, and reducing the manufacturing cost and operation and maintenance cost.

[0051] As attached Figure 8 As shown, preferably, the base 2 is integrally cast with the hub 6 of the wind turbine. In addition, the base 2 and the hub 6 of the wind turbine can also be fixed by other fixed connection methods, and the pitch of the blades of the wind turbine can be changed by the slewing bearing device of the present invention.

[0052] In summary, the technical effects corresponding to the technical features involved in the present invention are:

[0053] By forming a rotating pair through the pin bushings (1.7a and 1.7b) in the pin holes (1.1a and 1.1b) of the slewing bracket 1 and the pins (5.1a and 5.1b) fixedly mounted on the pitch actuator 5, the pitch actuator 5 can swing relative to the slewing bracket 1 around the axis 1.5 of the pin holes (1.1a and 1.1b) during its linear reciprocating motion, thereby reducing the wear of the pitch actuator 5 during its linear reciprocating motion, increasing the service life of the pitch actuator 5, and reducing the maintenance cost.

[0054] By forming a couple relationship between a first sliding member 3.1 arranged between the slewing support 1 and the base 2 and a second sliding member 3.2 arranged between the base 2 and the pressure cover 4, the bending moment load from the linear reciprocating motion of the pitch actuator 5 is borne, and the shaft bushing 2.2 in the shaft hole 2.1 of the base 2 which forms a rotating pair with the shaft 1.3 of the slewing support 1 is subjected to the lateral force load from the linear reciprocating motion of the pitch actuator 5, thereby improving the reliability of the pitch slewing support device, while reducing the supporting capacity requirements of the hub component, and reducing the manufacturing cost and operation and maintenance cost.

[0055] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A slewing bearing device for a wind turbine pitch actuator, characterized in that: The slewing support device at least includes a slewing support, a base, a sliding member, and a gland; The slewing bracket at least comprises a pin hole, a supporting annular surface and a rotating shaft, and the slewing bracket is connected to the pitch actuator through the pin hole; The base is provided with a shaft hole, a shaft bushing is embedded in the shaft hole, and a first supporting surface and a second supporting surface are provided at both ends of the shaft hole; The sliding member includes a first sliding member and a second sliding member, the first sliding member is arranged between the supporting annular surface and the first supporting surface, and the second sliding member is arranged between the second supporting surface and the gland; the gland is connected to the end surface of the rotating shaft; The rotating shaft and the rotating shaft bushing form a rotating pair; There are two pin shaft holes, each of which is provided with a pin shaft bushing for supporting a pin shaft installed on the pitch actuator; the axis of the pin shaft hole is perpendicular to the linear reciprocating motion direction of the pitch actuator; The axis of the rotating shaft is perpendicular to the axis of the pin shaft hole; and a threaded hole is arranged on the end surface of the rotating shaft.

2. The slewing bearing device of a wind turbine pitch actuator according to claim 1, characterized in that: The first sliding member is fixed on the supporting ring surface, the second sliding member is fixed on the pressure cover, the first sliding member slides relative to the first supporting surface, and the second sliding member slides relative to the second supporting surface.

3. The slewing bearing device of a wind turbine pitch actuator according to claim 1, characterized in that: The first sliding member is fixed on the first supporting surface, the second sliding member is fixed on the second supporting surface, the first sliding member slides relative to the supporting annular surface, and the second sliding member slides relative to the pressure cover.

4. A slewing bearing device for a wind turbine pitch actuator according to claim 2 or 3, characterized in that: The first sliding member and the second sliding member are segmented sector ring structures or integral circular ring structures.

5. The slewing bearing device of a wind turbine pitch actuator according to claim 4, characterized in that: The first sliding member and the second sliding member are both made of non-metallic materials that are resistant to pressure and wear.

6. The slewing bearing device of a wind turbine pitch actuator according to claim 1, characterized in that: The gland is provided with a through hole, and the through hole is connected to the threaded hole by bolts. When the swivel bracket rotates relative to the base, the gland rotates synchronously with the swivel bracket.

7. The slewing bearing device of a wind turbine pitch actuator according to claim 1, characterized in that: The base is integrally cast with the hub of the wind turbine generator set.

8. The slewing bearing device of a wind turbine pitch actuator according to claim 1, characterized in that: The base is fixedly connected to the wheel hub.

9. A wind turbine generator set, comprising the slewing bearing device of the wind turbine generator set pitch actuator according to any one of claims 1 to 8.

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