Wind power blade variable pitch device

Abstract

The utility model discloses a wind power blade variable pitch device which comprises a butt joint ring and a blade, a plurality of connecting rods are inserted in the side wall of the butt joint ring, a ring baffle is arranged in the inner wall of the butt joint ring, a plurality of bolts are arranged in the ring baffle, the blade is inserted in the butt joint ring and makes contact with the ring baffle, and the connecting rods are connected with the connecting rods. The utility model relates to the technical field of draught fans, the roots of the blades are connected through the bolts, the blades are installed on a butt joint ring in a bolt connection mode, one end of each bolt penetrates through the bottom of the corresponding blade, stretches into the corresponding blade and is connected with a nut in a screwed mode, an anti-loosening mechanism is arranged in each blade, and an opening is formed in the center of the bottom of each blade. The butt joint ring is connected with the rotating part of the variable pitch system in the hub through the connecting rod and the screw rod, the space between the blades and the hub is enlarged through the butt joint ring, a worker can conveniently hold the hydraulic plate head to apply torque to the bolt, and meanwhile the enlarged space can relatively reduce the oppressed feeling.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbines, in particular to a wind turbine blade pitch control device. Background Art

[0002] A wind turbine is a device that uses wind power to generate electricity. In order to cater to changes in wind force, the blades of the wind turbine will have a variable pitch function. The variable pitch function means that the blades of the wind turbine are installed on a turntable inside a hub with a rotating function. The motor drives the blades of the wind turbine to rotate, thereby realizing the function of the blades freely adjusting their angle to the wind.

[0003] In the existing wind turbine design, there are usually three rotating parts in the wind turbine hub, and the input ends of the three rotating parts are connected to a drive motor, and the root of the wind turbine blade is fixed to the rotating end of the rotating part in the hub through a number of bolts and nuts, so that the wind turbine blade can be driven to rotate by the drive motor. The design of this part of the wind turbine is simple and effective, and there are no obvious defects in the actual production of wind turbines. However, the wind turbine is a relatively complex large-scale power generation equipment. In order to ensure that it can work normally and stably, the existing wind power site will have a semi-annual inspection and a full year inspection. During the semi-annual inspection and the full year inspection, the wind turbine will be maintained as a whole, including the inspection and maintenance of the root of the wind turbine blade and the pitch system, as well as the maintenance of the bolt torque. In order to take into account the overall weight of the wind turbine, the hub of the wind turbine is designed to be small, and the entire pitch system, drive system and lubrication system are also included inside it. Therefore, the space inside the hub is very small. At the same time, the bolt torque maintenance of the blades must be completed by two people, so the work will be affected by the environment, and the small environment is extremely stuffy, which is inconvenient for the staff to inspect and repair. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a wind turbine blade pitch control device, which solves the problems of narrow space at the connection between the existing hub and the blade, stuffy environment, and inconvenient maintenance for staff.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions: a wind turbine blade pitch device, including a docking ring and a blade, a plurality of connecting rods are inserted into the side wall of the docking ring, a ring block is provided in the inner wall of the docking ring, a plurality of bolts are provided in the ring block, the blade is inserted into the docking ring and contacts the ring block, one end of the plurality of bolts passes through the bottom of the blade and extends into the interior and is screwed with a nut, an anti-loosening mechanism is provided in the blade, and an opening is opened at the center position of the bottom of the blade.

[0006] Preferably, the anti-loosening mechanism includes an annular washer arranged in the blade, the annular washer is provided with a plurality of holes, the upper ends of the plurality of bolts are respectively inserted into the plurality of holes, the upper and lower wall surfaces of the annular washer are respectively in contact with a plurality of nuts and blades, and gaskets are provided between the plurality of bolts and the annular block.

[0007] Preferably, an annular gear ring is provided in the inner wall of the docking ring, and protruding teeth are provided on the inner wall of the annular gear ring.

[0008] Preferably, a screw is provided at the lower end of each of the connecting rods.

[0009] Preferably, a cover plate is provided in the opening.

[0010] Beneficial Effects

[0011] The utility model provides a wind turbine blade pitch changing device, which has the following beneficial effects:

[0012] 1. The blade is installed on the docking ring by bolting at the root of the blade, and the docking ring is connected to the rotating part of the pitch system in the hub through a connecting rod and a screw. The docking ring increases the space between the blade and the hub, making it easier for the staff to use the hydraulic plate head to apply torque to the bolts. At the same time, the increased space will be relatively small.

[0013] 2. An annular gear ring and protruding teeth are provided on the inner wall of the docking ring, which can be used as a point of force for the staff. Before entering the hub of the wind turbine, the staff needs to use hydraulic brakes and manual safety to fix the hub before entering the hub. When the hub is locked, its blades and pitch positions may be in an inclined position. Therefore, an annular gear ring and protruding teeth are provided in the docking ring to help the staff to exert force and facilitate work. The number of bolts on the ring guard is several and distributed in a circle, so it is designed as an annular gear ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front sectional view of the utility model.

[0015] In the figure: 1. blade; 2. docking ring; 3. connecting rod; 4. screw; 5. annular gear ring; 6. protruding teeth; 7. bolt; 8. gasket; 9. ring stop; 10. annular washer; 11. nut; 12. opening; 13. cover plate. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1 The utility model provides a technical solution: a wind turbine blade pitch device, comprising a docking ring 2 and a blade 1, a plurality of connecting rods 3 are inserted into the side wall of the docking ring 2, a ring block 9 is provided in the inner wall of the docking ring 2, a plurality of bolts 7 are provided in the ring block 9, the blade 1 is inserted into the docking ring 2 and contacts the ring block 9, one end of the plurality of bolts 7 passes through the bottom of the blade 1 and extends into the inside and is screwed with a nut 11, an anti-loosening mechanism is provided in the blade 1, and an opening 12 is opened at the center of the bottom of the blade 1;

[0018] A docking ring 2 is added between the conventional blade and hub direct connection structure, thereby increasing the space at the pitch position, which is beneficial to the work of the staff.

[0019] Furthermore, the anti-loosening mechanism includes an annular washer 10 arranged in the blade 1, and a plurality of holes are opened on the annular washer 10. The upper ends of the plurality of bolts 7 are respectively inserted into the plurality of holes. The upper and lower wall surfaces of the annular washer 10 are respectively in contact with a plurality of nuts 11 and the blade 1, and a gasket 8 is provided between the plurality of bolts 7 and the annular block 9.

[0020] Furthermore, an annular gear ring 5 is provided in the inner wall of the docking ring 2 , and protruding teeth 6 are provided on the inner wall of the annular gear ring 5 .

[0021] Furthermore, a screw 4 is provided at the lower end of several of the connecting rods 3; the screw 4 is connected to the rotating part of the variable pitch system of the wind turbine hub and fixed with a nut. This installation method replaces the traditional direct connection of the blades with the docking ring 2. Its installation method belongs to conventional technical means and therefore does not need to be described in detail.

[0022] Furthermore, a cover plate 13 is provided in the opening 12 ; the cover plate 13 is fixed to the bottom of the blade 1 by means of bolt connection.

[0023] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in the field. The following mainly introduces the working principle and process.

[0024] Embodiment: When in use, the staff opens the cover plate 13, and then uses the hydraulic plate head to apply torque to the nut 11 (the working method of the hydraulic plate head applying torque belongs to the known technology). When the staff moves in the docking ring 2, they can use the annular gear ring 5 and the protruding teeth 6 as the fulcrum, which is convenient for work.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Although the embodiments of the utility model have been shown and described, it is understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A wind turbine blade pitch control device, comprising a docking ring (2) and a blade (1), characterized in that: A plurality of connecting rods (3) are inserted into the side wall of the docking ring (2), a ring block (9) is provided in the inner wall of the docking ring (2), a plurality of bolts (7) are provided in the ring block (9), the blade (1) is inserted into the docking ring (2) and contacts the ring block (9), one end of the plurality of bolts (7) passes through the bottom of the blade (1) and extends into the inside and is screwed with a nut (11), an anti-loosening mechanism is provided in the blade (1), and an opening (12) is provided at the center position of the bottom of the blade (1).

2. A wind turbine blade pitch control device according to claim 1, characterized in that: The anti-loosening mechanism comprises an annular washer (10) arranged in the blade (1), the annular washer (10) is provided with a plurality of holes, the upper ends of the plurality of bolts (7) are respectively inserted into the plurality of holes, the upper and lower wall surfaces of the annular washer (10) are respectively in contact with the plurality of nuts (11) and the blade (1), and gaskets (8) are provided between the plurality of bolts (7) and the ring block (9).

3. A wind turbine blade pitch control device according to claim 1, characterized in that: An annular gear ring (5) is provided in the inner wall of the docking ring (2), and protruding teeth (6) are provided on the inner wall of the annular gear ring (5).

4. A wind turbine blade pitch control device according to claim 1, characterized in that: The lower ends of the plurality of connecting rods (3) are each provided with a screw rod (4).

5. A wind turbine blade pitch control device according to claim 1, characterized in that: A cover plate (13) is provided in the opening (12).

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