Wind power variable pitch device

Abstract

The utility model discloses a wind power variable pitch device which comprises a variable pitch assembly, a hub, a variable pitch hydraulic oil cylinder arranged in the hub, a sealing piece arranged on the variable pitch hydraulic oil cylinder and a blade bearing arranged on the hub. The sealing device comprises an outer screw plug, a shaft sealing ring arranged in the outer screw plug, a USH sealing ring arranged in the outer screw plug, a buffering sealing ring arranged in the outer screw plug, a gasket arranged at the end of the outer screw plug, and a gland arranged on the gasket. According to the wind power variable pitch device, the outer screw plug and the positioning sleeve are designed separately, the outer screw plug and the positioning sleeve are independent parts and can be detached separately, the detaching process is simplified, the needed steps are reduced, the outer screw plug and the positioning sleeve can be treated independently and conveniently when the piston rod needs to be replaced or maintained due to the separate design, and the operation is convenient. And other parts are not influenced.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment technology, and in particular to a wind power pitch control device. Background Technology

[0002] The wind turbine pitch control unit is a very important component of a wind turbine generator set. Its main function is to adjust the pitch angle of the wind turbine blades to control the mechanical energy absorbed by the wind turbine generator set, so as to reduce the impact of wind on the generator set while obtaining maximum energy.

[0003] Analysis of the pitch cylinder's operation revealed that the piston rod and cylinder body are sealed to prevent oil pressure leakage. The internal hydraulic pressure of the cylinder body is maintained at 200-220 bar. When the wind speed in the wind farm is high and varies greatly, the wind turbine pitch changes frequently, which accelerates the aging and failure of the cylinder seals. However, due to the limited working space inside the existing equipment hub and the large weight of the pitch cylinder, some hydraulic cylinder seals and piston rods cannot be replaced, resulting in increased workload. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is that the working space inside the hub is small, the pitch cylinder is heavy, and some hydraulic cylinder seals and piston rods cannot be replaced, resulting in a large workload.

[0005] The above-mentioned technical problems are solved by the following technical solution: This utility model proposes a wind power pitch device, which includes a pitch assembly, including a hub, a pitch hydraulic cylinder disposed inside the hub, a seal disposed on the pitch hydraulic cylinder, and a blade bearing disposed on the hub. The seal includes an outer screw plug and a pressure cap disposed on the outer screw plug.

[0006] In a preferred embodiment of the wind power pitch converter of this utility model: the outer wall of the outer screw plug is provided with a rotating groove, the inside of the rotating groove is provided with a control ring, the control ring is provided with an arc-shaped groove, the inside of the arc-shaped groove is provided with a movable pin, and the outer wall of the pressure cap is provided with a fixing groove.

[0007] In a preferred embodiment of the wind power pitch converter of this utility model: the outer wall of the control ring is provided with a plurality of positioning holes, the interior of the outer screw plug is provided with a moving groove, the interior of the moving groove is provided with a locking pin, the outer wall of the locking pin is provided with a control block, and the outer wall of the locking pin is provided with a locking spring.

[0008] In a preferred embodiment of the wind power pitch device of this utility model: the outer screw plug is provided with a shaft sealing ring, a USH sealing ring provided inside the outer screw plug, and a buffer sealing ring provided inside the outer screw plug.

[0009] In a preferred embodiment of the wind power pitch device of this utility model: a gasket is provided at the end of the outer screw plug, a pressure cap is provided on the gasket, and a dustproof ring is provided inside the pressure cap.

[0010] In a preferred embodiment of the wind power pitch device of this utility model: the outer wall of the outer screw plug is provided with an O-ring and a positioning sleeve provided outside the O-ring.

[0011] In a preferred embodiment of the wind power pitch device of this utility model: the pitch assembly further includes a hydraulic pump station, an accumulator disposed on the hydraulic pump station, a control valve block disposed on the accumulator, and a slip ring disposed on the hydraulic pump station.

[0012] In a preferred embodiment of the wind power pitch control device of this utility model: a connecting member is provided at the output end of the pitch hydraulic cylinder, a connecting rod is provided at one end of the connecting member, and the other end of the connecting rod is provided on the blade bearing.

[0013] In a preferred embodiment of the wind turbine pitch control device of this utility model: a cross bushing is provided at the end of the pitch hydraulic cylinder, and the cross bushing is connected to the inner wall of the hub.

[0014] In a preferred embodiment of the wind power pitch control device of this utility model: the outer wall of the pitch hydraulic cylinder is provided with multiple oil pipes.

[0015] The beneficial effects of this utility model are as follows: by designing the outer screw plug and the positioning sleeve separately, the outer screw plug and the positioning sleeve are separated into independent components that can be disassembled separately, simplifying the disassembly process and reducing the required steps; by driving the control ring to rotate, the internal moving pin is disengaged from the pressure cover, thereby completing the disassembly of the equipment and achieving the effect of quick installation and disassembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this utility model and are not intended to limit the scope of this utility model. Wherein:

[0017] Figure 1 A schematic diagram of the internal structure of the hub of the wind turbine pitch converter is shown;

[0018] Figure 2 A schematic diagram of the blade bearing structure of a wind turbine pitch control device is shown.

[0019] Figure 3 A schematic diagram of the internal structure of the pitch hydraulic cylinder of the wind turbine pitch control device is shown.

[0020] Figure 4 This shows a schematic diagram of the original internal structure of the hydraulic cylinder of the wind turbine pitch converter;

[0021] Figure 5 A schematic diagram of the external screw plug structure of a wind turbine pitch converter is shown.

[0022] Figure 6 A schematic diagram of the locking pin structure of a wind turbine pitch converter is shown. Detailed Implementation

[0023] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0025] Reference Figures 1-4 This embodiment provides a wind power pitch device, including a pitch assembly 1, including a hub 11, a pitch hydraulic cylinder 12 disposed inside the hub 11, a seal 13 disposed on the pitch hydraulic cylinder 12, and a blade bearing 14 disposed on the hub 11.

[0026] The hub 11 is a key component connecting the blades and the main shaft. It not only fixes the blades and transmits the mechanical energy converted from wind energy, but also bears the load of the blades. The pitch hydraulic cylinder 12 is an important piece of equipment used to control the rotation of the blades and perform the pitch change process. The seal 13 is used to seal the inside of the pitch cylinder to prevent the internal hydraulic oil from leaking, ensuring that the pitch hydraulic cylinder 12 can operate normally. The blade bearing 14 is used to connect the hub 11 and the blades, enabling the wind turbine to convert wind energy into electrical energy.

[0027] Preferably, by controlling the operation of the pitch hydraulic cylinder 12 inside the hub 11, the piston rod inside the pitch hydraulic cylinder 12 drives the blade bearing 14 to rotate, thereby adjusting the blade and completing the pitch process. This controls the amount of wind energy captured by the blade, thereby optimizing the power output and ensuring efficient and stable operation under different wind speeds, improving overall operating efficiency and safety.

[0028] Furthermore, the seal 13 includes an outer screw plug 131, a shaft seal ring 132 disposed inside the outer screw plug 131, a USH seal ring 133 disposed inside the outer screw plug 131, and a buffer seal ring 134 disposed inside the outer screw plug 131.

[0029] The external screw plug 131 is used for the oil port or other openings on the hydraulic cylinder to achieve a sealing effect. The shaft seal ring 132 is used to seal the gap between the piston rod and the hydraulic cylinder to prevent hydraulic oil leakage. The USH seal ring 133 usually refers to a U-shaped seal ring, which is used to seal the hydraulic oil between the piston and the cylinder body. The buffer seal ring 134 is used to reduce the impact when the piston or piston rod moves to the end, protect the seal 13 from impact damage, and extend its service life.

[0030] Preferably, the use of shaft seal ring 132, USH seal ring 133 and buffer seal ring 134 improves the sealing effect between the cylinder and piston rod, and also reduces the impact of the piston rod moving to the end, thereby increasing the service life of the equipment.

[0031] Furthermore, the end of the outer screw plug 131 is provided with a gasket 135, a cap 136 provided on the gasket 135, and a dustproof ring 137 provided inside the cap 136.

[0032] The gasket 135 is used to seal the gap between the gland 136 and the outer screw plug 131, further enhancing the sealing effect. The gland 136 is used to close one end of the hydraulic cylinder to ensure that the hydraulic oil does not leak. The dust ring 137 is used to prevent external dust and dirt from entering the hydraulic cylinder and protect the internal components from contamination.

[0033] Furthermore, the outer wall of the outer screw plug 131 is provided with an O-ring 138 and a positioning sleeve 139 located outside the O-ring 138.

[0034] Preferably, the O-ring 138 is provided to seal the interface between two or more connecting parts, and the positioning sleeve 139 is provided to fix the position of the seal 13 and prevent it from shifting during installation or use.

[0035] Preferably, by separating the outer screw plug 131 and the positioning sleeve 139, the individual parts can be installed and removed separately during installation and disassembly, simplifying the disassembly process and reducing the required steps. The separate design also makes it easier to handle the outer screw plug 131 and the positioning sleeve 139 separately when the piston rod needs to be replaced or maintained, without affecting other components.

[0036] Furthermore, the pitch assembly 1 also includes a hydraulic pump station 15, an accumulator 16 disposed on the hydraulic pump station 15, a control valve block 17 disposed on the accumulator 16, and a slip ring 18 disposed on the hydraulic pump station 15.

[0037] The hydraulic pump station 15 is equipped with a hydraulic pump driven by an electric motor. This pump draws hydraulic oil from the tank, compresses it into a high-pressure fluid, and then delivers it throughout the hydraulic system, providing the necessary power to various hydraulic actuators. The accumulator 16 typically consists of a pressure vessel, a gas chamber, and an oil chamber. When the system pressure is too high, hydraulic oil is forced into the accumulator 16, compressing the gas to store energy. When the system requires additional pressure or flow, the accumulator 16 releases the stored energy to supplement or maintain the system's hydraulic pressure. The control valve block 17 is the regulation and control system in the hydraulic system. It consists of multiple valves used to control the flow direction, pressure, and flow rate of the hydraulic oil. Based on control signals, the valves in the valve block open or close, thereby achieving precise control of the hydraulic actuators and meeting the operational requirements of the wind turbine under different working conditions.

[0038] Furthermore, the output end of the pitch hydraulic cylinder 12 is provided with a connector 19, one end of which is provided with a connecting rod 20, and the other end of the connecting rod 20 is provided on the blade bearing 14.

[0039] The connecting rod 20 is used to connect the connecting piece 19 and the blade bearing 14 together. The connecting piece 19 is used to assist the pitch hydraulic cylinder 12 in controlling the operation of the connecting rod 20, thereby causing the blade bearing 14 to rotate. This causes the pitch hydraulic cylinder 12 to drive the blade bearing 14 to rotate, thus completing the pitch operation of the equipment.

[0040] Furthermore, a cross bushing is provided at the end of the pitch hydraulic cylinder 12, and the cross bushing is connected to the inner wall of the hub 11.

[0041] The cross bushing is used to fix the pitch hydraulic cylinder 12 inside the hub 11, so that it can still rotate after being fixed.

[0042] Furthermore, the outer wall of the pitch hydraulic cylinder 12 is provided with multiple oil pipes.

[0043] Inside the hub 11, there are three oil pipes, which are thick, medium and thin. The thinnest oil pipe is the pitch lock oil pipe, the medium oil pipe is the inlet oil pipe and the thickest oil pipe is the outlet oil pipe. They are mainly used to lock and unlock the steering system.

[0044] In summary: The original pitch hydraulic cylinder's outer screw plug 131 and positioning sleeve 139 were an integrated design. This design required disconnecting the piston rod from the piston rod during disassembly, involving multiple steps and a specific sequence, making maintenance very cumbersome. This new device, however, separates the outer screw plug 131 and positioning sleeve 139. Because they are independent components, they can be disassembled separately, simplifying the disassembly process and reducing the required steps. This separate design also allows for easier handling of the outer screw plug 131 and positioning sleeve 139 when replacing or maintaining the piston rod, without affecting other components.

[0045] As an optional embodiment, refer to Figures 5-6 The second embodiment provided in this embodiment includes a rotating groove 22 on the outer wall of the outer screw plug 131, a control ring 23 inside the rotating groove 22, an arc-shaped groove 24 on the control ring 23, a moving pin 25 inside the arc-shaped groove 24, and a fixing groove 26 on the outer wall of the pressure cap 136.

[0046] The rotating groove 22 is designed to facilitate the rotation of the control ring 23 inside. The control ring 23 is designed to control the movement of the movable pin 25, thereby locking and unlocking the cover 136. The movable pin 25 is designed to cooperate with the fixing groove 26 to fix the cover 136, thereby completing the installation of the cover 136.

[0047] Preferably, the control ring 23 has an arc-shaped groove 24 in the middle, with one end of the arc-shaped groove 24 close to the center and the other end close to the outer ring. Multiple through holes are provided on the outer wall of the control ring 23. When it is necessary to unlock the cover 136, a through hole is selected, the column is inserted into the through hole, and then the control ring 23 is rotated, causing the control ring 23 to drive the arc-shaped groove 24 to rotate. This causes the arc-shaped groove 24 to control the moving pin 25 to expand and contract, thereby completing the locking and unlocking of the cover 136 and achieving the effect of quick installation and disassembly.

[0048] Furthermore, the outer wall of the control ring 23 is provided with multiple positioning holes 27, the inner wall of the outer screw plug 131 is provided with a moving groove 28, the inner wall of the moving groove 28 is provided with a locking pin 29, the outer wall of the locking pin 29 is provided with a control block 30, and the outer wall of the locking pin 29 is provided with a locking spring 31.

[0049] The positioning hole 27 is used to lock the control ring 23 with the locking pin 29, so that it cannot rotate and prevent the cover 136 from falling off during operation. The moving groove 28 is set to prevent the locking pin 29 and the locking spring 31 from pushing the locking pin 29 into the interior of the positioning hole 27, so that the control ring 23 cannot rotate. The control block 30 is set to facilitate the movement of the locking pin 29.

[0050] Preferably, by pulling the control block 30, the control block 30 drives the locking pin 29 to move, causing the locking pin 29 to disengage from the positioning hole 27. Then, by rotating the control ring 23, the control block 30 can be rotated. When locking, it is only necessary to move the control ring 23 to a specific position and then release the control block 30, so that the locking pin 29 enters the positioning hole 27, completing the locking of the control ring 23 and preventing the pressure cap 136 from accidentally falling off.

[0051] In summary: By inserting the column into the round hole on the outer wall of the control ring 23, first pulling the locking pin 29 out of the positioning hole 27 on the control ring 23, and then rotating the control ring 23 to drive the arc groove 24 to rotate, the moving pin 25 can be disengaged from the fixing groove 26 on the pressure cover 136, thereby completing the disassembly of the pressure cover 136. Only a column with a diameter smaller than the round hole is needed to complete the disassembly, achieving the effect of quick disassembly. When installing, simply reverse the above operation to complete the installation, achieving the effect of quick installation and disassembly.

[0052] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of this utility model.

Claims

1. A wind turbine pitch control device, characterized in that: include, The pitch assembly (1) includes a hub (11), a pitch hydraulic cylinder (12) disposed inside the hub (11), a seal (13) disposed on the pitch hydraulic cylinder (12), and a blade bearing (14) disposed on the hub (11). The seal (13) includes an outer screw plug (131) and a cap (136) disposed on the outer screw plug (131).

2. The wind turbine pitch control device according to claim 1, characterized in that: The outer wall of the external screw plug (131) is provided with a rotating groove (22), the inside of the rotating groove (22) is provided with a control ring (23), the control ring (23) is provided with an arc groove (24), the inside of the arc groove (24) is provided with a moving pin (25), and the outer wall of the pressure cap (136) is provided with a fixing groove (26).

3. The wind turbine pitch control device according to claim 2, characterized in that: The outer wall of the control ring (23) is provided with a plurality of positioning holes (27), the inner wall of the outer screw plug (131) is provided with a moving groove (28), the inner wall of the moving groove (28) is provided with a locking pin (29), the outer wall of the locking pin (29) is provided with a control block (30), and the outer wall of the locking pin (29) is provided with a locking spring (31).

4. The wind turbine pitch control device according to claim 1, characterized in that: The outer screw plug (131) is provided with a shaft seal (132), a USH seal (133) provided inside the outer screw plug (131), and a buffer seal (134) provided inside the outer screw plug (131).

5. The wind turbine pitch control device according to claim 4, characterized in that: The end of the external screw plug (131) is provided with a gasket (135), a cap (136) provided on the gasket (135), and a dustproof ring (137) provided inside the cap (136).

6. The wind turbine pitch control device according to claim 5, characterized in that: The outer wall of the outer screw plug (131) is provided with an O-ring (138) and a positioning sleeve (139) provided outside the O-ring (138).

7. The wind turbine pitch control device according to claim 1, characterized in that: The pitch assembly (1) also includes a hydraulic pump station (15), an accumulator (16) disposed on the hydraulic pump station (15), a control valve block (17) disposed on the accumulator (16), and a slip ring (18) disposed on the hydraulic pump station (15).

8. The wind turbine pitch control device according to claim 1, characterized in that: The output end of the pitch hydraulic cylinder (12) is provided with a connector (19), one end of the connector (19) is provided with a connecting rod (20), and the other end of the connecting rod (20) is provided on the blade bearing (14).

9. The wind turbine pitch control device according to claim 8, characterized in that: The end of the pitch hydraulic cylinder (12) is provided with a cross bushing (21), which is connected to the inner wall of the hub (11).

10. The wind turbine pitch control device according to claim 9, characterized in that: The outer wall of the pitch hydraulic cylinder (12) is provided with multiple oil pipes.

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