Hydraulic variable-pitch oil cylinder device of wind generating set

Abstract

The utility model relates to a hydraulic variable pitch oil cylinder device of a wind generating set, which is mounted on a hub of the wind generating set and comprises an integrated base, a first oil cylinder, a second oil cylinder and a connecting structure. One ends of the first oil cylinder and the second oil cylinder are hinged to the integrated base, the other ends of the first oil cylinder and the second oil cylinder are hinged to the connecting structure, and the first oil cylinder and the second oil cylinder are spaced by 180 degrees; and the connecting structure is connected with the inner ring of the variable pitch bearing. Compared with the prior art, a double-oil-cylinder structure is adopted, and the overall variable-pitch driving capacity is improved; the first oil cylinder and the second oil cylinder are connected through the integrated base, torsion generated to the web in the oil cylinder operation push-pull process is effectively balanced, web deformation and oil cylinder piston rod deflection are reduced, and the stability in the operation process is greatly improved; and the oil cylinder is arranged on the outer side of the web, so that the passing safety of a channel on the inner side of the hub is ensured.

Description

Technical Field

[0001] The utility model relates to a driving mechanism of a variable pitch system of a wind generator set, in particular to a hydraulic variable pitch oil cylinder device of a wind generator set. Background Art

[0002] Current hydraulic pitch control systems for wind turbines primarily utilize a single cylinder drive. The cylinder's hinge point is located on the outside of the hub. It extends through a hole in the front end of the hub and connects to the web. The web is then connected to the inner ring of the bearing. The cylinder drives the web, which in turn rotates the inner ring of the bearing to achieve pitch control. This single-cylinder solution limits the driving force for the entire pitch control, and the cylinder layout in this case places additional demands on the hub structure.

[0003] In existing technology, dual-cylinder solutions typically employ two cylinders in the drive system, one mounted on either side of the wind turbine's web. These cylinders drive a driven component, which in turn rotates the outer bearing ring relative to the inner bearing ring, thereby achieving blade pitch control. However, this cylinder arrangement can lead to significant web deformation during operation.

[0004] In summary, how to design a hydraulic pitch cylinder device for a wind turbine generator set with smaller web deformation and larger driving force requires solving a technical problem. Utility Model Content

[0005] The purpose of the present utility model is to provide a hydraulic pitch cylinder device for a wind turbine generator set in order to overcome the defects of the prior art such as small driving force or large web deformation.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] According to one aspect of the utility model, a hydraulic pitch cylinder device of a wind turbine generator set is provided, which is installed on the hub of the wind turbine generator set. The hub of the wind turbine generator set includes a frame, a web and a pitch flange ring. A pitch bearing is also installed on the hub of the wind turbine generator set. The pitch cylinder device includes an integrated base, a first cylinder, a second cylinder and a connecting structure. The integrated base is installed on the web near the center of the pitch bearing surface. One end of the first cylinder and the second cylinder are hinged to the integrated base, and the other end is hinged to the connecting structure. The first cylinder and the second cylinder are 180° apart; the connecting structure is connected to the inner ring of the pitch bearing.

[0008] As a preferred technical solution, the integrated base is provided with two installation cavities, and the first oil cylinder and the second oil cylinder are respectively inserted into one installation cavity.

[0009] As a preferred technical solution, the integrated base includes a first base plate and a second base plate connected along the axial direction of the wheel hub, the first base plate is connected to the web, two mounting cavities are formed between the first base plate and the second base plate, and the first oil cylinder and the second oil cylinder are respectively inserted into one mounting cavity.

[0010] As a preferred technical solution, an end cover is provided on the installation cavity, and a hinge point of the first oil cylinder or the second oil cylinder away from one end of the piston rod is installed in the end cover.

[0011] As a preferred technical solution, the installation cavity is provided with a first end cover and a second end cover, the first end cover is located on the first base plate, the second end cover is located on the second base plate, and the first oil cylinder or the second oil cylinder is installed in the first end cover and the second end cover away from the hinge point of one end of the piston rod.

[0012] As a preferred technical solution, the integrated base is a long strip structure, and the first oil cylinder and the second oil cylinder are symmetrically hinged at both ends of the integrated base.

[0013] As a preferred technical solution, the one-piece base is a cast one-piece base.

[0014] As a preferred technical solution, the wind turbine hub further includes a first connecting plate and a second connecting plate, which clamp the inner ring of the pitch bearing and are connected to the pitch bearing.

[0015] As a preferred technical solution, the connection structure includes a push-pull ring and a pin shaft. The push-pull ring is installed at one end of the piston rod of the first oil cylinder and the second oil cylinder. The pin shaft passes through the push-pull ring and its two ends are fixed between the first connecting plate and the second connecting plate.

[0016] As a preferred technical solution, a spherical bearing is installed between the push-pull ring and the pin shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The utility model adopts a dual-cylinder structure, which improves the overall variable pitch drive capability. The first and second cylinders are connected by an integrated base, which effectively balances the torsion of the web during the push-pull operation of the cylinders, reduces web deformation and cylinder piston rod deflection, and greatly improves the stability of the dual cylinders during operation. The cylinders are arranged on the outside of the hub web, without occupying the space inside the hub, ensuring the safety of the passage inside the hub.

[0019] 2) In the present invention, the end of the first or second oil cylinder away from the piston rod is hinged to the integrated base, and the piston rod is connected to the connecting plate, which increases the force arm of the oil cylinder during operation and can reduce the force on the oil cylinder body, especially the oil cylinder piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the utility model being installed on the hub of a wind turbine generator set;

[0021] Figure 2 This is a schematic diagram of the hub structure of the wind turbine generator set of the present invention;

[0022] Figure 3 This is a schematic diagram of the partial structure of the hub of the wind turbine generator set of the present invention;

[0023] Figure 4 This is a schematic diagram of the overall structure of the integrated base of the utility model;

[0024] Figure 5 This is a schematic diagram of the connection between the utility model and the first connecting plate and the second connecting plate;

[0025] The numbers in the figure show:

[0026] 1. Frame, 2. Web, 3. Pitch flange ring, 4. Pitch bearing, 5. Integrated base, 61. First oil cylinder, 62. Second oil cylinder, 7. First end cover, 8. Second end cover, 9. First connecting plate, 10. Second connecting plate, 11. Push-pull ring, 12. Pin. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] like Figure 1 As shown, the utility model provides a hydraulic pitch cylinder device for a wind turbine generator set, which is installed on the hub of the wind turbine generator set and includes an integrated base 5, a first cylinder 61, a second cylinder 62 and a connecting structure.

[0029] like Figure 2 As shown, the wind turbine hub includes a frame 1, a web 2, a pitch flange ring 3, a first connecting plate 9 and a second connecting plate 10. The frame 1, the web 2 and the pitch flange ring 3 are connected in sequence. The first connecting plate 9 and the second connecting plate 10 clamp the inner ring of the pitch bearing 4 and are connected to the pitch bearing 4.

[0030] like Figure 3 As shown, the integrated base 5 is an integrally cast long strip, mounted on the surface of the web 2 near the pitch bearing 4 and located at the center of the web 2, and includes a first base plate and a second base plate that are stacked and connected to each other. The first base plate is connected to the web 2, and two mounting cavities are formed between the first base plate and the second base plate. The first oil cylinder 61 and the second oil cylinder 62 are respectively inserted into one mounting cavity; a first end cap 7 is provided on the first base plate on one side of the mounting cavity, and a second end cap 8 is provided on the second base plate on the other side. The rear end of the first oil cylinder 61 or the second oil cylinder 62 (the end without the piston rod extending therefrom) is provided with a hinge point, which is mounted within the first end cap 7 and the second end cap 8. The use of the first end cap 7 and the second end cap 8 can ensure that when the rotational motion of the rear end hinge point wears out and requires replacement of internal self-lubricating bushings and other structures, it is more convenient without having to completely disassemble and extract the first oil cylinder 61 or the second oil cylinder 62. At the same time, this upper and lower end cap design ensures that even if the first oil cylinder 61 or the second oil cylinder 62 needs to be completely disassembled and replaced, the integrated base 5 can remain intact during the entire disassembly process, thus reducing the work required to disassemble the integrated base 5. In addition, the design of the first end cap 7 and the second end cap 8 allows the integrated base 5 to be made less tall, further reducing its weight and making it easier for the integrated base 5 to withstand stress.

[0031] The first oil cylinder 61 and the second oil cylinder 62 are installed 180 degrees apart and completely symmetrically, with the rear end hinged to the integrated base 5 and the front end (the end with the piston rod extending therefrom) hinged to the connecting structure.

[0032] like Figure 4 As shown, the connection structure includes a push-pull ring 11 and a pin 12. The push-pull ring 11 is installed at the front end of the first oil cylinder 61 and the second oil cylinder 62. The pin 12 passes through the push-pull ring 11 and is fixed at both ends between the first connecting plate 9 and the second connecting plate 10. A spherical bearing is installed between the push-pull ring 11 and the pin 12.

[0033] The first and second oil cylinders 61, 62 can rotate about the rear hinge point within the mounting cavity of the integrated base 5. Oil can be loaded into the first and second oil cylinders 61, 62 to push the piston rods to telescope. The force applied to the piston rods is transmitted through the pin 12 and the first and second connecting plates 9, 10, acting on the inner ring of the pitch bearing 4, thereby rotating the inner ring of the pitch bearing 4 and achieving the pitch control function.

[0034] This new design utilizes dual-cylinder drive, enhancing overall pitch control drive force. Furthermore, the dual-cylinder layout further enhances safety during the entire wind turbine pitch control process. The dual cylinders (first cylinder 61 and second cylinder 62) are positioned outside the hub, with the center secured to the web 2 via an integrated base 5. This eliminates the need for space inside the hub, ensuring safe passage through the hub's inner passageway. The two cylinders are arranged 180° apart, resulting in a clear and simple layout that maximizes the use of space outside the hub web 2. The rear base of the dual oil cylinder adopts an integrated casting base, which will effectively avoid the torsional effect on the web 2 and other parts during the operation of the dual oil cylinders, thereby improving the stability of the pitch. The rear end hinges of the first oil cylinder 61 and the second oil cylinder 62 are fixed by the first end cover 7 and the second end cover 8, which facilitates the replacement of the related structures of the rear end hinges of the first oil cylinder 61 and the second oil cylinder 62. The front ends of the first oil cylinder 61 and the second oil cylinder 62 are connected to the first connecting plate 9 and the second connecting plate 10 through the push-pull ring 11 and the pin 12. When a problem occurs in the oil cylinder, the first connecting plate 9 and the second connecting plate 10 do not need to be removed. Only the pin 12 needs to be pulled out from the push-pull ring 11 to disconnect the connection between the oil cylinder piston rod, which facilitates the replacement of the oil cylinder. The first connecting plate 9 and the second connecting plate 10 are independent structures, and only a single structure needs to be replaced or repaired. At the same time, the layout and connection structure of the oil cylinder can be matched with different pitch bearing sizes and specifications by adjusting the length of the integrated base 5 and the position of the rear end hinge of the oil cylinder, thereby improving the reusability and adaptability of the entire structure.

[0035] In summary, the layout and connection of the integrated oil cylinder of the present invention facilitates the replacement and maintenance of the oil cylinder-related structures. Moreover, this structure and layout will effectively increase the commonality of the existing pitch bearing 4 and other components such as the hub body.

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A wind turbine hydraulic pitch cylinder device, mounted on a wind turbine hub, wherein the wind turbine hub comprises a frame (1), a web (2) and a pitch flange ring (3), and a pitch bearing (4) is also mounted on the wind turbine hub, characterized in that: The pitch cylinder device comprises an integrated base (5), a first oil cylinder (61), a second oil cylinder (62) and a connecting structure, wherein the integrated base (5) is mounted on the web (2) at the center of the surface of the pitch bearing (4), the first oil cylinder (61) and the second oil cylinder (62) are hinged to the integrated base (5) at one end and hinged to the connecting structure at the other end, and the first oil cylinder (61) and the second oil cylinder (62) are 180° apart; and the connecting structure is connected to the inner ring of the pitch bearing (4).

2. A wind turbine generator hydraulic pitch cylinder device according to claim 1, characterized in that: The integrated base (5) is provided with two installation cavities, and the first oil cylinder (61) and the second oil cylinder (62) are respectively inserted into one installation cavity.

3. The hydraulic pitch cylinder device of a wind turbine generator set according to claim 1, characterized in that: The integrated base (5) includes a first base plate and a second base plate connected along the axial direction of the hub, the first base plate is connected to the web (2), two installation cavities are formed between the first base plate and the second base plate, and the first oil cylinder (61) and the second oil cylinder (62) are respectively inserted into one installation cavity.

4. A wind turbine hydraulic pitch cylinder device according to claim 2 or 3, characterized in that: An end cover is provided on the installation cavity, and the first oil cylinder (61) or the second oil cylinder (62) is installed in the end cover away from the hinge point at one end of the piston rod.

5. The hydraulic pitch cylinder device of a wind turbine generator set according to claim 3, characterized in that: The installation cavity is provided with a first end cover (7) and a second end cover (8), the first end cover (7) is located on the first base plate, the second end cover (8) is located on the second base plate, and the first oil cylinder (61) or the second oil cylinder (62) is installed in the first end cover (7) and the second end cover (8) away from the hinge point at one end of the piston rod.

6. The hydraulic pitch cylinder device of a wind turbine generator set according to claim 1, characterized in that: The integrated base (5) is a long strip structure, and the first oil cylinder (61) and the second oil cylinder (62) are symmetrically hinged at both ends of the integrated base (5).

7. The hydraulic pitch cylinder device of a wind turbine generator set according to claim 1, characterized in that: The one-piece base (5) is a cast one-piece base (5).

8. The hydraulic pitch cylinder device for a wind turbine generator set according to claim 1, characterized in that: The wind turbine hub further comprises a first connecting plate (9) and a second connecting plate (10), wherein the first connecting plate (9) and the second connecting plate (10) clamp the inner ring of the pitch bearing (4) and are connected to the pitch bearing (4).

9. The hydraulic pitch cylinder device of a wind turbine generator set according to claim 8, characterized in that: The connection structure includes a push-pull ring (11) and a pin (12), wherein the push-pull ring (11) is installed at one end of the piston rod of the first oil cylinder (61) and the second oil cylinder (62), and the pin (12) passes through the push-pull ring (11) and has both ends fixed between the first connecting plate (9) and the second connecting plate (10).

10. The hydraulic pitch cylinder device of a wind turbine generator set according to claim 9, characterized in that: A joint bearing is installed between the push-pull ring (11) and the pin shaft (12).

Images