A lightweight wind turbine blade electric pitch drive mechanism

Abstract

This utility model discloses a lightweight electric pitch drive mechanism for wind turbine blades, including a bearing housing mounted on the wind turbine hub, a blade bearing support rotatably mounted on the bearing housing, an external gear ring fixed to the bottom circumferential surface of the blade bearing support, and a support base welded to the surface of the blade bearing support and located above the external gear ring. The support base has a slot on its side for inserting a support plate, the left end of which is inserted into the slot, and a fixing bolt is provided between the support plate and the support base. This patent achieves lightweight improvement of the drive mechanism through the design of the motor support plate with an aluminum alloy honeycomb sandwich structure, reducing the weight of a single frame, significantly reducing the load on the turbine head, and optimizing the inertial distribution of the wind turbine. Simultaneously, the bolt blocking structure above the support base effectively limits the rotational displacement of the bolts under alternating loads, significantly extending the maintenance cycle of the transmission system, and has significant economic benefits and engineering application value.

Description

Technical Field

[0001] This utility model belongs to the field of blade pitch angle adjustment technology, specifically relating to a lightweight wind turbine blade electric pitch drive mechanism. Background Technology

[0002] In wind turbine generator sets, the blade pitch angle adjustment mechanism is one of the core components. Its function is to optimize wind energy capture efficiency and ensure the safe operation of the unit under extreme conditions by dynamically adjusting the angle between the blade and the wind direction (pitch angle). Currently, the external independent drive pitch system is the mainstream technical solution. Its typical structure is as follows: each blade is equipped with an independent drive motor. The motor drives the external gear pitch bearing to rotate through the gear transmission mechanism, which in turn drives the blade to swing around the root hinge. In this type of system, the drive motor is usually fixed inside or outside the nacelle through the motor frame. The motor output shaft is connected to a pinion, which meshes with the external gear ring of the pitch bearing to convert the rotational motion into changes in the blade pitch angle.

[0003] However, existing technologies have the following significant drawbacks: 1. Traditional motor frames are mostly made of cast iron or solid metal, which can meet the strength requirements, but the weight is too large, which increases the overall weight of the motor head and causes the following problems: Moving the nose forward increases the load on the tower and foundation, thus raising construction costs; Increased rotor inertia reduces pitch response speed and affects power regulation accuracy; The increased difficulty of transportation and installation, especially for offshore wind power projects, directly drives up hoisting costs due to the increased weight.

[0004] 2. Insufficient connection stability: The motor frame and nacelle are typically secured with bolts, but existing designs lack effective anti-loosening mechanisms. Under long-term alternating loads (such as wind vibration and start-stop impacts), the bolts are prone to loosening, leading to the following risks: Failure of the connection between the frame and the cabin caused the drive motor to shift or detach. Misalignment of gears accelerates wear in the transmission system and can even cause gear breakage; The maintenance cycle is shortened, requiring frequent shutdowns for repairs, which reduces power generation and economic benefits.

[0005] Therefore, this utility model proposes a lightweight electric pitch drive mechanism for wind turbine blades. Utility Model Content

[0006] The purpose of this invention is to provide a lightweight electric pitch drive mechanism for wind turbine blades to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a lightweight wind turbine blade electric pitch drive mechanism, comprising a bearing housing mounted on a wind turbine hub, a blade bearing support rotatably mounted on the bearing housing, an external gear ring fixed to the bottom circumferential surface of the blade bearing support, a support plate mounted on one side of the blade bearing support, and a pitch drive motor fixed to the top of the support plate, wherein the output end of the pitch drive motor extends through to the bottom of the support plate and is connected to a drive gear meshing with the external gear ring. It also includes a bracket seat welded to the surface of the blade bearing support and located above the outer gear ring, and the side of the bracket seat is provided with a slot for inserting a bracket plate. The left end of the bracket plate is inserted into the slot, and a fixing bolt is provided between the bracket plate and the bracket seat. The support plate consists of two layers of aluminum alloy panels and an aluminum alloy honeycomb core disposed between the two layers of aluminum alloy panels. The bonding surfaces of the aluminum alloy panels and the aluminum alloy honeycomb core are provided with structural adhesive. Positioning blocks that fit against the sides of the support base are fixed on both the upper and lower surfaces of the support plate. The bracket base is provided with a bolt blocking structure that blocks the top of the fixing bolt.

[0008] Preferably, the left end surface of the bracket plate is provided with a threaded hole for screwing in the fixing bolt, and the upper and lower surfaces of the bracket seat are provided with bolt holes for inserting the fixing bolt. The threaded end of the fixing bolt is screwed into the threaded hole through the bolt hole.

[0009] Preferably, the bolt blocking structure includes a T-shaped shaft fixed to the top surface of the bracket seat, a rotating base sleeve rotatably sleeved on the surface of the T-shaped shaft, and a blocking block fixed to the side of the rotating base sleeve and extending to the top of the fixing bolt.

[0010] Preferably, the bolt blocking structure further includes a side seat fixed to the surface of the blade bearing support and located above the bracket seat, and a locking structure is provided between the side seat and the rotating base sleeve.

[0011] Preferably, the engaging structure includes an inner groove formed in the side seat, a spring installed in the inner groove, and a hemispherical limiting block. The surface of the rotating base sleeve is provided with a plurality of circular limiting slots for the ends of the hemispherical limiting block to engage.

[0012] Preferably, one end of the spring is fixed to the inner wall of the inner groove, and the other end of the spring is fixed to the hemispherical limiting block.

[0013] Preferably, the bottom surface of the bracket is equipped with a bottom sealing block, and the top of the bottom sealing block is provided with an integral annular insert that is inserted into a bolt hole.

[0014] Preferably, the surface of the annular insert is provided with an integral annular locking block, and the inner wall of the bolt hole is provided with an annular locking groove corresponding to the annular locking block, and the annular locking block is squeezed into the annular locking groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This patent achieves lightweight improvement of the drive mechanism through the design of the motor bracket plate with aluminum alloy honeycomb sandwich structure, reduces the weight of a single frame, significantly reduces the load on the head, and optimizes the inertial distribution of the wind turbine; at the same time, the bolt blocking structure above the bracket can effectively limit the rotational displacement of the bolts under alternating loads, greatly extending the maintenance cycle of the transmission system, and has significant economic benefits and engineering application value. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 A magnified view of a portion of region A in the middle; Figure 3 This utility model Figure 2 A magnified view of a portion of region B in the middle; Figure 4 This is a cross-sectional view of the connection between the support plate and the support base of this utility model; Figure 5 This utility model Figure 4 A magnified view of a portion of region C in the middle; Figure 6 This utility model Figure 4 A magnified view of a portion of region D in the middle; Figure 7 This is an exploded view of the support plate of this utility model; In the diagram: 1. Wind turbine hub; 2. Bearing housing; 3. Blade bearing support; 31. Side seat; 311. Inner groove; 312. Spring; 313. Hemispherical limiting block; 4. External gear ring; 5. Support seat; 51. Rotating base sleeve; 511. Circular limiting groove; 52. T-shaped shaft; 53. Blocking block; 54. Slot; 55. Bolt hole; 551. Annular groove; 56. Bottom sealing block; 561. Annular insert; 562. Annular locking block; 6. Support plate; 601. Aluminum alloy panel; 602. Structural adhesive; 603. Aluminum alloy honeycomb core; 61. Positioning support block; 62. Threaded hole; 7. Pitch drive motor; 8. Drive gear; 9. Fixing bolt. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example Please see Figures 1 to 7 This is an embodiment of the present utility model, which provides the following technical solution: a lightweight wind turbine blade electric pitch drive mechanism, including a bearing seat 2 mounted on a wind turbine hub 1, a blade bearing support 3 rotatably mounted on the bearing seat 2, an external gear ring 4 fixed on the bottom circumferential surface of the blade bearing support 3, a support plate 6 mounted on one side of the blade bearing support 3, and a pitch drive motor 7 fixed on the top of the support plate 6. The output end of the pitch drive motor 7 extends through to the bottom of the support plate 6 and is connected to a drive gear 8 that meshes with the external gear ring 4. The above structures are all prior art and do not involve the improvements of this application. The specific structural principle will not be elaborated here. When the pitch drive is actually performed, the operation of the pitch drive motor 7 causes the drive gear 8 to drive the external gear ring 4 and the blade bearing support 3 to rotate, thereby completing the pitch angle change of the blade bearing support 3 and the blades on the blade bearing support 3. It also includes a bracket 5 welded to the surface of the blade bearing support 3 and located above the outer gear ring 4. The side of the bracket 5 is provided with a slot 54 for the bracket plate 6 to be inserted. The left end of the bracket plate 6 is inserted into the slot 54. A fixing bolt 9 is provided between the bracket plate 6 and the bracket 5 to achieve a stable connection between the bracket plate 6 and the bracket 5. The support plate 6 consists of two layers of aluminum alloy panels 601 and an aluminum alloy honeycomb core 603 disposed between the two layers of aluminum alloy panels 601. Structural adhesive 602 is provided on the bonding surface of the aluminum alloy panels 601 and the aluminum alloy honeycomb core 603, making the support plate 6 an aluminum alloy honeycomb sandwich structure, achieving its own lightweight improvement, reducing weight, significantly reducing the load on the turbine head, and optimizing the inertial distribution of the impeller. The upper and lower surfaces of the support plate 6 are fixed with positioning support blocks 61 that fit against the side of the support base 5, which can effectively support and reinforce the top and bottom of the support plate 6, ensuring the stability of the support plate 6 after it is connected to the support base 5. The bracket base 5 is provided with a bolt blocking structure that blocks the top of the fixing bolt 9, which can effectively limit the rotational displacement of the fixing bolt 9 under alternating load and prevent the fixing bolt 9 from falling off.

[0019] In this embodiment, preferably, the left end surface of the support plate 6 is provided with a threaded hole 62 for screwing in the fixing bolt 9, and the upper and lower surfaces of the support base 5 are provided with bolt holes 55 for inserting the fixing bolt 9. The threaded end of the fixing bolt 9 is screwed into the threaded hole 62 through the bolt hole 55, so that the fixing bolt 9 can complete the stable connection between the support plate 6 and the support base 5. After the fixing bolt 9 is fully tightened, the top end of the fixing bolt 9 will be in close contact with the top surface of the support base 5.

[0020] In this embodiment, preferably, the bolt blocking structure includes a T-shaped shaft 52 fixed to the top surface of the bracket base 5, a rotating base sleeve 51 rotatably sleeved on the surface of the T-shaped shaft 52, and a blocking block 53 fixed to the side of the rotating base sleeve 51 and extending to the top of the fixing bolt 9. The end of the blocking block 53 extends to the top of the fixing bolt 9 to effectively block the fixing bolt 9, ensuring the installation stability of the fixing bolt 9 and preventing the fixing bolt 9 from rotating and falling off. There is a gap between the end of the blocking block 53 and the top surface of the fixing bolt 9 for the blocking block 53 to rotate. When actually disassembling and assembling the fixing bolt 9, it is only necessary to rotate the rotating base sleeve 51 so that the blocking block 53 can be rotated away from the top of the fixing bolt 9, which is highly convenient to operate.

[0021] In this embodiment, preferably, the bolt blocking structure further includes a side seat 31 welded and fixed to the surface of the blade bearing support 3 and located above the bracket 5, and a locking structure is provided between the side seat 31 and the rotating base sleeve 51.

[0022] In this embodiment, preferably, the engaging structure includes an inner groove 311 formed in the side seat 31, a spring 312 installed in the inner groove 311, and a hemispherical limiting block 313. The surface of the rotating base sleeve 51 is provided with a plurality of circular limiting slots 511 for the end of the hemispherical limiting block 313 to be engaged. During normal use, the end of the hemispherical limiting block 313 will be engaged in the circular limiting slot 511 under the push of the spring 312, thereby limiting the rotating base sleeve 51 and preventing the rotating base sleeve 51 from spinning. When it is necessary to rotate the rotating base sleeve 51 to rotate and remove the blocking block 53 from the top of the fixing bolt 9, simply push the fixing bolt 9 forcefully to make the rotating base sleeve 51 rotate and gradually squeeze the end of the hemispherical limiting block 313 into the inner groove 311, so as to smoothly realize the rotation operation of the rotating base sleeve 51.

[0023] In this embodiment, preferably, one end of the spring 312 is fixed to the inner wall of the inner groove 311, and the other end of the spring 312 is fixed to the hemispherical limiting block 313.

[0024] In this embodiment, preferably, a bottom sealing block 56 is installed on the bottom surface of the support base 5, and the top of the bottom sealing block 56 is provided with an integral annular insert 561 that is inserted into the bolt hole 55, which can seal and shield the bolt hole 55 on the bottom surface of the support base 5. The surface of the annular insert 561 is provided with an integral annular locking block 562, and the inner wall of the bolt hole 55 is provided with an annular locking groove 551 corresponding to the annular locking block 562. The annular locking block 562 is squeezed into the annular locking groove 551, which can... The annular insert 561 and the bottom sealing block 56 are limited to ensure the installation stability of the bottom sealing block 56. The bottom sealing block 56, the annular insert 561 and the annular locking block 562 are all made of fluororubber, which will undergo elastic deformation when squeezed. If the bottom sealing block 56 needs to be removed later, simply pull the bottom sealing block 56 down forcefully, so that the annular locking block 562 is squeezed and undergoes elastic deformation, and is finally pulled out from the annular locking groove 551, so that the bottom sealing block 56 can be pulled down and removed smoothly.

[0025] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight wind turbine blade electric pitch drive mechanism, comprising a bearing housing (2) mounted on a wind turbine hub (1), a blade bearing support (3) rotatably mounted on the bearing housing (2), an external gear ring (4) fixed to the bottom circumferential surface of the blade bearing support (3), a support plate (6) mounted on one side of the blade bearing support (3), and a pitch drive motor (7) fixed to the top of the support plate (6), wherein the output end of the pitch drive motor (7) extends through to the bottom of the support plate (6) and is connected to a drive gear (8) meshing with the external gear ring (4), characterized in that: It also includes a support seat (5) welded to the surface of the blade bearing support (3) and located above the outer gear ring (4), and the side of the support seat (5) is provided with a slot (54) for the support plate (6) to be inserted. The left end of the support plate (6) is inserted into the slot (54), and a fixing bolt (9) is provided between the support plate (6) and the support seat (5). The support plate (6) is composed of two layers of aluminum alloy panels (601) and an aluminum alloy honeycomb core (603) disposed between the two layers of aluminum alloy panels (601). The bonding surfaces of the aluminum alloy panels (601) and the aluminum alloy honeycomb core (603) are provided with structural adhesive (602). The upper and lower surfaces of the support plate (6) are fixed with positioning blocks (61) that are in contact with the side of the support base (5). The bracket (5) is provided with a bolt blocking structure that blocks the top of the fixing bolt (9).

2. The lightweight wind turbine blade electric pitch drive mechanism according to claim 1, characterized in that: The left end surface of the bracket plate (6) is provided with a threaded hole (62) for screwing in the fixing bolt (9). The upper and lower surfaces of the bracket seat (5) are provided with bolt holes (55) for inserting the fixing bolt (9). The threaded end of the fixing bolt (9) is screwed into the threaded hole (62) through the bolt hole (55).

3. The lightweight wind turbine blade electric pitch drive mechanism according to claim 1, characterized in that: The bolt blocking structure includes a T-shaped shaft (52) fixed to the top surface of the bracket (5), a rotating base sleeve (51) rotatably sleeved on the surface of the T-shaped shaft (52), and a blocking block (53) fixed to the side of the rotating base sleeve (51) and extending to the top of the fixing bolt (9).

4. The lightweight wind turbine blade electric pitch drive mechanism according to claim 3, characterized in that: The bolt blocking structure also includes a side seat (31) fixed on the surface of the blade bearing support (3) and located above the bracket seat (5), and a locking structure is provided between the side seat (31) and the rotating base sleeve (51).

5. The lightweight wind turbine blade electric pitch drive mechanism according to claim 4, characterized in that: The engaging structure includes an inner groove (311) opened in the side seat (31), a spring (312) installed in the inner groove (311), and a hemispherical limiting block (313). The surface of the rotating base sleeve (51) is provided with a plurality of circular limiting slots (511) for the end of the hemispherical limiting block (313) to be engaged.

6. The lightweight wind turbine blade electric pitch drive mechanism according to claim 5, characterized in that: One end of the spring (312) is fixed to the inner wall of the inner groove (311), and the other end of the spring (312) is fixed to the hemispherical limiting block (313).

7. The lightweight wind turbine blade electric pitch drive mechanism according to claim 1, characterized in that: The bottom surface of the bracket (5) is equipped with a bottom sealing block (56), and the top of the bottom sealing block (56) is provided with an integral annular insert (561) that is inserted into the bolt hole (55).

8. The lightweight wind turbine blade electric pitch drive mechanism according to claim 7, characterized in that: The surface of the annular insert (561) is provided with an integral annular locking block (562), and the inner wall of the bolt hole (55) is provided with an annular locking groove (551) corresponding to the annular locking block (562), and the annular locking block (562) is squeezed into the annular locking groove (551).

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