Hydraulic variable pitch structure of wind generating set

Abstract

The utility model relates to a hydraulic variable pitch structure of a wind generating set. The hydraulic variable pitch structure comprises a hub, two oil cylinders, a valve group, a hydraulic oil tank, an energy accumulator, a motor, a hydraulic pump, a blade lock and an electric control cabinet, the hub comprises a frame, a web plate and a variable pitch flange ring, and the two oil cylinders are installed on the web plate through an integrated base. A mounting plate is mounted at one end of the hub connected with the spindle; the valve group is mounted on the mounting plate, and the hydraulic oil tank is connected with the mounting plate and located in the hub; the energy accumulator, the motor, the hydraulic pump, the blade lock and the electric control cabinet are all installed on the web. Compared with the prior art, the variable pitch system has the advantages that the oil cylinder is mounted on the outer side of the web, and the valve group, the hydraulic oil tank, the energy accumulator, the motor, the hydraulic pump, the blade lock and the electric control cabinet are mounted in the hub, so that a plurality of components are integrated in the hub, and the overall stability and controllability of operation of the variable pitch system are improved; and the variable pitch system is separated from a yaw hydraulic system of the generator, so that the yaw is not influenced, and the like.

Description

Technical Field

[0001] The utility model relates to a wind generator, in particular to a hydraulic variable pitch structure of a wind generator set. Background Art

[0002] The mainstream mechanical structure of the hydraulic pitch system currently used for wind turbines is a single-cylinder drive. The cylinder fulcrum is located on the outside of the hub, and the front hinge of the cylinder is connected to the circular plate fixed on the inner ring of the pitch bearing and drives it to rotate the inner ring of the bearing.

[0003] The hydraulic components and accumulator associated with the hydraulic system are fixed to the main shaft end inside the wheel hub. Aside from the accumulator, valve block, and electrical control cabinet, all other components, including the oil tank, motor, and oil pump, are integrated with the yaw hydraulic system within the engine room. Oil flows from the engine room into the wheel hub via slip rings, driving the pitch control. This mechanical layout significantly reduces the independence of the pitch control system. A problem with the related hydraulic components within the engine room would affect both yaw and pitch control.

[0004] In summary, how to design a hydraulic pitch structure for a wind turbine generator set in which the hydraulic structure does not affect the pitch is a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of the present invention is to provide a hydraulic pitch-changing structure for a wind turbine generator set in order to overcome the defect in the prior art that the hydraulic mechanical structure affects the pitch changing.

[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 structure of a wind turbine is provided, comprising a hub connected to a main shaft and blades, the hub comprising a frame, a web and a pitch flange ring, the hydraulic pitch system further comprising two cylinders, a valve group, a hydraulic oil tank, an accumulator, a motor, a hydraulic pump, a blade lock and an electrical control cabinet; the two cylinders are mounted on the surface of the web close to the blades through an integrated base; one end of the hub connected to the main shaft is the main shaft end, and the main shaft end is equipped with a mounting plate; the valve group is mounted on the mounting plate through a first bracket and is located inside the hub; the hydraulic oil tank is connected to the frame and the mounting plate through a second bracket and is located inside the hub; the accumulator is mounted on the surface of the web away from the blades through a third bracket; the motor, hydraulic pump, blade lock and electrical control cabinet are all mounted on the surface of the web away from the blades.

[0008] As an optimal technical solution, the second bracket includes a bending bracket and a support rod, one end of the support rod is connected to the middle part of the mounting plate through the bending bracket, and the other end is connected to the frame through the bending bracket, and the support rod is perpendicular to the mounting plate, and the hydraulic oil tank is connected to the support rod.

[0009] As a preferred technical solution, there are three support rods, which are evenly distributed around the circumference and installed in the middle of the mounting plate, and the middle of the three support rods forms a first space; the valve group is located on the side of the first space close to the mounting plate, and the hydraulic oil tank is located on the side of the first space away from the mounting plate.

[0010] As a preferred technical solution, the support rod is an H-shaped steel.

[0011] As a preferred technical solution, the hub includes a first web, a second web and a third web, there are three accumulators, which are respectively installed in the middle of the first web, the second web and the third web; there are three blade locks, which are respectively installed on the same side of the first web, the second web and the third web and close to the main shaft end.

[0012] As a preferred technical solution, the motor and hydraulic pump are installed on the side of the first web where the blade lock is not installed; and the electrical control cabinet is installed on the side of the second web where the blade lock is not installed.

[0013] As a preferred technical solution, the third bracket includes a first clip and a second clip, which respectively fix the two ends of the accumulator to the web.

[0014] As a preferred technical solution, a fairing is installed on the hub, and the hydraulic pitch system further includes a hydraulic system radiator, which is installed inside the fairing.

[0015] As a preferred technical solution, one end of the air deflector is larger and the other end is smaller, and the hydraulic system radiator is installed inside the smaller end of the air deflector.

[0016] As a preferred technical solution, the mounting plate is circular and completely embedded in the hole at the spindle end.

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

[0018] 1) The oil cylinder of the utility model is installed on the outside of the web, and the valve group, hydraulic oil tank, accumulator, motor, hydraulic pump, blade lock and electrical control cabinet are all installed inside the hub, realizing the integration of multiple components inside the hub, improving the overall stability and controllability of the variable pitch system operation; the variable pitch system of the utility model is separated from the yaw hydraulic system in the generator nacelle and will not affect yaw;

[0019] 2) The hydraulic oil tank of the utility model is installed perpendicularly to the mounting plate at the center of the hub through the bent bracket of the second bracket and the support rod; the valve group is installed on the mounting plate at the main shaft end through the first bracket and can be located in the space formed by the support rod; the accumulator is installed in the middle of the web; the blade lock is installed on the same side of the web and close to the main shaft end; the motor and hydraulic pump are installed on the side of the first web where the blade lock is not installed; the electrical control cabinet is installed on the side of the first web where the blade lock is not installed; the arrangement of the various components fully utilizes the space in the hub, improving the space utilization rate of the hub system; and the various components are relatively independent, which improves the modularity and replaceability of the entire wind turbine rotor structure;

[0020] 3) The present invention eliminates the slip ring mechanism for oil transmission, reducing the risk of oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the hub and pitch bearing of the utility model;

[0022] Figure 2 This is a schematic diagram of the installation structure of the valve group and hydraulic oil tank of the utility model;

[0023] Figure 3 This is a schematic diagram of the oil cylinder installation structure of the utility model;

[0024] Figure 4 This is a schematic diagram of the installation structure of the accumulator and blade lock of the utility model;

[0025] Figure 5 This is a schematic diagram of the installation structure of the accumulator, motor and hydraulic pump of the utility model;

[0026] Figure 6 This is a schematic diagram of the installation structure of the accumulator and electrical control cabinet of the utility model;

[0027] Figure 7 This is a schematic diagram of the installation structure of the hydraulic system radiator of the utility model;

[0028] The numbers in the figure show:

[0029] 1. Frame, 2. Web, 3. Pitch flange ring, 4. Pitch bearing, 5. Cylinder, 6. Integrated base, 7. Upper connecting plate, 8. Lower connecting plate, 9. Mounting plate, 10. Valve group, 11. Hydraulic oil tank, 12. Support rod, 13. Accumulator, 14. Motor, 15. Blade lock, 16. Electrical control cabinet, 17. Fairing, 18. Front cap head, 19. Hydraulic system radiator, 20. Bending bracket, 21. Hydraulic pump. DETAILED DESCRIPTION

[0030] 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.

[0031] The utility model provides a hydraulic variable pitch structure of a wind turbine generator set, comprising a hub, a main shaft, blades, a variable pitch bearing 4, a deflector 17, two oil cylinders 5, a valve group 10, a hydraulic oil tank 11, an accumulator 13, a motor 14, a hydraulic pump 21, a blade lock 15 and an electrical control cabinet 16. The main shaft and blades are both connected to the hub, and there are three blades.

[0032] The hub includes a frame 1 , a web 2 and a pitch flange ring 3 .

[0033] The two oil cylinders 5 are installed on the outside of the web 2 through an integrated base 6, that is, located on the outside of the hub. The integrated base 6 is located in the middle of the web 2. The piston rod of the oil cylinder 5 is connected to the inner ring of the pitch bearing 4 through the upper connecting plate 7 and the lower connecting plate 8.

[0034] One end of the hub mounting main shaft is the main shaft end, and the main shaft end is installed with a mounting plate 9 of the same shape as the main shaft end (circular as shown in the figure), which makes the installation more stable. One end of the blade mounting is installed with a web 2. The blade has three pieces, so the web 2 includes a first web 2, a second web 2 and a third web 2.

[0035] The valve group 10 is fixed in the middle of the mounting plate 9 through a first bracket and is located inside the wheel hub. The first bracket includes a connecting portion and a platform. The connecting portion is connected to the mounting plate 9, and the valve group 10 is fixed on the platform.

[0036] The hydraulic oil tank 11 is installed in the middle of the wheel hub through the second bracket. The second bracket includes a bent bracket 20 and a support rod 12. The support rod 12 can be made of H-shaped steel. The two ends of the support rod 12 are connected to the mounting plate 9 and the frame 1 through the bent bracket 20. The support rod 12 is perpendicular to the mounting plate 9; there are three support rods 12, which are evenly distributed on the mounting plate 9 around the circumference of the valve group 10. A first space is formed inside the three support rods 12. The hydraulic oil tank 11 is connected to the support rod 12 and is located at one end of the first space away from the mounting plate 9. The valve group 10 is located in the first space at one end close to the mounting plate 9. The hydraulic oil tank 11 and the valve group 10 are both located in the middle of the wheel hub.

[0037] Three accumulators 13 are mounted on the three webs 2 via a third bracket. The third bracket includes a first clip and a second clip, each of which secures the ends of the accumulator 13. The accumulator 13 is located in the middle of the web 2. The accumulator 13 is fixed to the web 2 using multiple fulcrums, which distribute the load and simplify the fulcrum structure.

[0038] The commonly used existing solution uses a cantilever bracket to secure the accumulator 13 to the main shaft end. However, the weight of the accumulator 13 itself, the centrifugal force and impact caused by the rotor's rotation, and other factors place higher demands on the cantilever structure, which is equivalent to having only one fulcrum. The cantilever and its securing structure must be sufficiently strong to meet the strength and life requirements under long-cycle rotational motion. Furthermore, the commonly used existing solution uses a cantilever structure to secure the accumulator 13 to the main shaft end because most hydraulic pitch systems currently use a single cylinder 5 for drive. The cylinder 5 extends from the front end of the hub into the hub. The rotation of the cylinder 5 occupies some space on the web 2, making it impossible to place the accumulator 13 on the web 2. Therefore, the present invention not only solves the problem of the cylinder 5 occupying space inside the hub, but also reduces the requirements for fulcrum strength.

[0039] There are three blade locks 15 , which are respectively mounted on the three webs 2 , and are located on one side of the web 2 and close to the main shaft end.

[0040] The motor 14 and the hydraulic pump 21 are installed on the side of the first web 2 where the blade lock 15 is not installed, and the electrical control cabinet 16 is installed on the side of the second web 2 where the blade lock 15 is not installed.

[0041] A deflector 17 is installed on the wheel hub. One end of the deflector 17 is larger and the other end is smaller. The smaller end is a front cap head 18, and a hydraulic system radiator 19 is installed inside the front cap head 18.

[0042] According to the above-described installation arrangement, the valve assembly 10, hydraulic oil tank 11, accumulator 13, motor 14, hydraulic pump 21, blade lock 15, and electrical control cabinet 16 can all be located inside the wheel hub, maintaining their independence and facilitating replacement. The oil cylinder 5 is located outside the wheel hub, without interfering with other hydraulic components. Because the hydraulic system's oil storage components, such as the hydraulic oil tank 11 and accumulator 13, are integrated within the wheel hub, the entire hydraulic system's oil circulation is achieved within the wheel hub. This eliminates the need for oil to enter the wheel hub from the engine room via slip rings, eliminating the slip ring mechanism for oil transmission and reducing the risk of oil leakage.

[0043] The connection between the various components of the utility model mainly relies on brackets and bolts, which is convenient for the inspection, maintenance and replacement of various components. The component installation position and the number of hydraulic components can be adjusted according to the hub size and the required pitch driving force, and try to ensure that they are evenly distributed on the three pitch surfaces, so as to achieve a more friendly and uniform force on the hydraulic components and the overall hub system when the wind wheel rotates, thereby reducing unbalanced loading.

[0044] 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 hydraulic pitch control structure for a wind turbine generator, comprising a hub connected to a main shaft and blades, the hub comprising a frame (1), a web (2) and a pitch control flange ring (3), characterized in that: The hydraulic pitch structure further comprises two oil cylinders (5), a valve group (10), a hydraulic oil tank (11), an accumulator (13), a motor (14), a hydraulic pump (21), a blade lock (15) and an electrical control cabinet (16); the two oil cylinders (5) are mounted on the surface of the web (2) close to the blades through an integrated base (6); one end of the hub connected to the main shaft is the main shaft end, and the main shaft end is mounted with a mounting plate (9); the valve group (10) is mounted on the mounting plate (9) through a first bracket and is located inside the hub; the hydraulic oil tank (11) is connected to the frame (1) and the mounting plate (9) through a second bracket and is located inside the hub; the accumulator (13) is mounted on the surface of the web (2) away from the blades through a third bracket; the motor (14), the hydraulic pump (21), the blade lock (15) and the electrical control cabinet (16) are all mounted on the surface of the web (2) away from the blades.

2. The hydraulic pitch control structure of a wind turbine generator set according to claim 1, characterized in that: The second bracket comprises a bending bracket (20) and a support rod (12), one end of the support rod (12) is connected to the middle of the mounting plate (9) through the bending bracket (20), and the other end is connected to the frame (1) through the bending bracket (20), and the support rod (12) is perpendicular to the mounting plate (9), and the hydraulic oil tank (11) is connected to the support rod (12).

3. The hydraulic pitch control structure of a wind turbine generator set according to claim 2, characterized in that: There are three support rods (12) which are evenly distributed around the circumference and installed in the middle of the mounting plate (9). The middle of the three support rods (12) forms a first space; the valve group (10) is located on a side of the first space close to the mounting plate (9), and the hydraulic oil tank (11) is located on a side of the first space away from the mounting plate (9).

4. A hydraulic pitch-changing structure for a wind turbine generator set according to claim 2 or 3, characterized in that: The support rod (12) is an H-shaped steel.

5. The hydraulic pitch control structure of a wind turbine generator set according to claim 1, characterized in that: The hub comprises a first web (2), a second web (2) and a third web (2); there are three accumulators (13), which are respectively mounted in the middle of the first web (2), the second web (2) and the third web (2); there are three blade locks (15), which are respectively mounted on the same side of the first web (2), the second web (2) and the third web (2) and close to the main shaft end.

6. The hydraulic pitch-changing structure of a wind turbine generator set according to claim 5, characterized in that: The motor (14) and the hydraulic pump (21) are mounted on the side of the first web (2) where the blade lock (15) is not mounted; and the electrical control cabinet (16) is mounted on the side of the second web (2) where the blade lock (15) is not mounted.

7. The hydraulic pitch control structure of a wind turbine generator set according to claim 1, characterized in that: The third bracket comprises a first clip and a second clip, which respectively fix the two ends of the accumulator (13) to the web (2).

8. The hydraulic pitch control structure of a wind turbine generator set according to claim 1, characterized in that: A fairing (17) is mounted on the wheel hub, and the hydraulic pitch structure further comprises a hydraulic system radiator (19), which is mounted inside the fairing (17).

9. The hydraulic pitch-changing structure of a wind turbine generator set according to claim 8, characterized in that: One end of the deflector (17) is larger and the other end is smaller, and the hydraulic system radiator (19) is installed inside the smaller end of the deflector (17).

10. The hydraulic pitch control structure of a wind turbine generator set according to claim 1, characterized in that: The mounting plate (9) is circular and completely embedded in the hole at the spindle end.

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