Alternating current variable pitch system

Abstract

The invention relates to the technical field of fan pitch control, in particular to an alternating-current pitch control system which comprises a pitch control fan shell and a connecting shell, the connecting shell is fixedly connected to the outer side of the pitch control fan shell, pitch control shafts are rotationally connected to the side, facing the center of the pitch control fan shell, of the connecting shell, and bevel gear rings are fixedly connected to the other sides of the pitch control shafts correspondingly; rotating rings are arranged on the outer sides of the bevel gear rings, connecting rods are fixedly connected to the inner sides of the rotating rings, and power assemblies are fixedly connected to the other sides of the connecting rods; when the variable-pitch fan is used, the rotating ring is arranged in the variable-pitch fan shell, the bevel gear teeth arranged on the outer side of the rotating ring drive the three sets of bevel gear rings on the outer side of the variable-pitch fan shell to rotate, the bevel gear rings drive the variable-pitch shaft to rotate, then the variable-pitch shaft drives the blades to rotate, and synchronous variable pitch of the three sets of blades can be achieved through the same rotating ring; and the problem of inconsistent variable pitch angles does not exist, so that the variable pitch quality can be ensured, and the normal use of the fan can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine pitch control, and in particular to an AC pitch control system. Background Art

[0002] The variable pitch system of a wind turbine undertakes the dual tasks of controlling and protecting the wind turbine. When the unit is started, the variable pitch system controls the blades to rotate to the appropriate angle so that the impeller has the appropriate starting torque. During the grid-connected process, the variable pitch system controls the impeller speed to achieve fast and impact-free grid connection. When the wind speed is below the rated wind speed, the variable pitch system controls the blade pitch angle to 0° to achieve maximum output of the unit. When the wind speed is near (or above) the rated wind speed, the variable pitch system adjusts the pitch angle at any time according to changes in wind speed to control the absorbed mechanical energy, ensuring the maximum energy (corresponding to the rated power) while reducing the impact of wind on the wind turbine. When shutting down, the variable pitch system adjusts the wind turbine blades to the feathering position to achieve aerodynamic braking and shut down the wind turbine safely. The variable pitch control is combined with the variable speed constant frequency technology to ultimately improve the power generation efficiency and power quality of the entire wind turbine.

[0003] There are currently two methods for changing the pitch of a wind turbine. One is to use a pitch motor to drive the pitch gear to rotate, and the pitch gear drives the blades of the wind turbine to rotate for adjusting the angle. The other is to use hydraulic equipment to pull the pitch shaft to rotate, and then adjust the blade angle. No matter which method is used, three sets of equipment are required to adjust the blade angle separately. This will result in different blade angles once one set of equipment is delayed in starting or fails, which will increase the unbalanced load on the wind turbine blades, making it easy for the wind turbine to fail to rotate normally, and even directly cause blade damage. Therefore, an AC pitch system is proposed to address the above problems. Summary of the invention

[0004] The object of the present invention is to provide an AC pitch control system to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] As an optional solution of the AC variable pitch system described in the present invention, an AC variable pitch system includes a variable pitch fan housing and a connecting housing,

[0007] A connecting shell is fixedly connected to the outer side of the variable pitch fan housing, and a side of the connecting shell facing the center of the variable pitch fan housing is rotatably connected to a variable pitch shaft, and the other side of the variable pitch shaft is fixedly connected to a bevel gear ring, and a rotating ring is provided on the outer side of the bevel gear ring, and a connecting rod is fixedly connected to the inner side of the rotating ring, and a power assembly is fixedly connected to the other side of the connecting rod, and the outer side of the power assembly is fixedly connected to the variable pitch fan housing.

[0008] At present, there are two ways to change the pitch of a wind turbine. One is to use a pitch motor to drive the pitch gear to rotate, and the pitch gear drives the blades of the wind turbine to rotate to adjust the angle. The other is to use hydraulic equipment to pull the pitch shaft to rotate, and then adjust the blade angle. No matter which method is used, three sets of equipment are required to adjust the blade angle separately. This will result in different blade angles once one set of equipment is delayed in starting or fails, which will increase the unbalanced load on the blades of the wind turbine, making it easy for the wind turbine to fail to rotate normally, and even directly cause damage to the blades. When the device is in use, it is installed on the pitch fan housing. A rotating ring is arranged inside, and the bevel gear teeth arranged on the outside of the rotating ring drive the three sets of bevel gear rings on the outside of the variable pitch fan casing to rotate, and then the bevel gear ring drives the variable pitch shaft to rotate, and the variable pitch shaft drives the blades to rotate. At this time, the three sets of blades can be synchronously pitched through the same rotating ring, and there is no problem of inconsistent pitch angles, so the pitch quality can be guaranteed, and the normal use of the fan can be guaranteed. Moreover, this setting only needs one set of motors to realize the rotation of the three sets of blades, which not only ensures the synchronization of the blades, but also compared with the traditional method that requires three sets of adjustment equipment, this device only needs one set, which greatly reduces the cost investment.

[0009] As an optional solution of the AC pitch system described in the present invention, three groups of evenly distributed bevel gear teeth are installed on the outer side of the rotating ring, and the rotating ring is meshed with the bevel gear ring through the bevel gear teeth.

[0010] This arrangement allows the rotating ring to drive the bevel gear teeth to move when the rotating ring rotates, and the bevel gear teeth can drive the bevel gear ring to rotate. At this time, the three sets of variable pitch shafts can be driven to rotate, thereby realizing three sets of synchronous variable pitch, and the problem of different variable pitch angles is less likely to occur.

[0011] As an optional solution of the AC variable pitch system described in the present invention, an annular groove is opened on the rear side of the rotating ring, and a support ring is arranged inside the annular groove. The rotating ring is rotatably connected to the support ring through the annular groove, and the rear side of the support ring is fixedly connected to the variable pitch fan casing.

[0012] As an optional solution of an AC variable pitch system described in the present invention, a limit frame is arranged on the outer side of the rotating ring, and the limit frame includes a fixed plate and an arc plate, one side of the fixed plate is fixedly connected to the variable pitch fan housing, and the other end of the fixed plate is fixedly connected to the arc plate, the outer side of the fixed plate is in close contact with the rotating ring, the side of the arc plate facing the rotating ring is arranged in an arc surface, and the outer side of the arc plate is slidably connected to the rotating ring.

[0013] When the rotating ring rotates, the support ring provided on the rotating ring serves the purpose of supporting the rotating ring, and a fixed plate and an arc plate are provided on the other side of the rotating ring. The fixed plate is located on the other side of the rotating ring to serve the purpose of supporting and limiting, and the arc plate contacts the inner side of the rotating ring, thereby ensuring the stable rotation of the rotating ring and avoiding displacement.

[0014] As an optional scheme of an AC variable pitch system described in the present invention, wherein: the power assembly includes a mounting frame, a motor and a driving gear, the outer side of the mounting frame is fixedly connected to the variable pitch fan housing, the inside of the mounting frame is fixedly connected to the motor, the outer side of the motor is fixedly connected to the driving gear, the outer side of the driving gear is meshed with three groups of driven gears, the center of the driven gear is fixedly connected to a rotating shaft, both ends of the rotating shaft are rotatably connected to the mounting frame, a rotating block is provided on the outer side of the rotating shaft, the outer side of the rotating block is fixedly connected to the connecting rod, and both ends of the rotating block are fixedly connected to connecting columns.

[0015] As an optional solution of the AC pitch system described in the present invention, evenly distributed gear teeth are fixedly connected to the inside of the rotating block facing the mounting frame, and the rotating block is meshed with the driven gear through the gear teeth.

[0016] When the rotating ring rotates, it starts the central motor, the motor drives the driving gear to rotate, and the driving gear drives the driven gear on the outside to rotate. Under the action of the driven gear, it can cooperate with the gear teeth on the inside of the rotating block, and then drive the rotating block on the outside to rotate. At this time, the stable rotation of the rotating ring can be guaranteed, and the connecting column serves the purpose of connecting the rotating blocks, and the three groups of driven gears can drive the three groups of variable pitch shafts on the outside to rotate synchronously, thereby achieving the purpose of synchronous angle adjustment.

[0017] As an optional solution of the AC pitch system described in the present invention, sealing blocks are fixedly connected to both sides of the rotating block, and the inner side of the sealing block is slidably connected to the mounting frame.

[0018] Sealing blocks are also provided on both sides of the rotating block. When the rotating block rotates, the sealing blocks can move, and one side of the sealing block is in close contact with the mounting frame. At this time, the contact part between the driven gear and the gear teeth can be prevented from being affected by external dust and impurities, thereby ensuring that the driven gear and the gear teeth can be used stably.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] When the present invention is in use, a rotating ring is arranged inside the variable pitch fan housing, and the bevel gear teeth arranged outside the rotating ring drive the three groups of bevel gear rings outside the variable pitch fan housing to rotate, so that the bevel gear ring drives the variable pitch shaft to rotate, and the variable pitch shaft drives the blades to rotate. At this time, the three groups of blades can be synchronously pitched through the same rotating ring, and there is no problem of inconsistent pitch angles, so the pitch quality can be guaranteed and the fan can be used normally.

[0021] When the rotating ring rotates, a support ring arranged on one side of the rotating ring serves to support the rotating ring, and a fixed plate and an arc plate are arranged on the other side of the rotating ring. The fixed plate is located on the other side of the rotating ring to support and limit the position, and the arc plate contacts the inner side of the rotating ring, thereby ensuring that the rotating ring rotates stably and avoiding displacement.

[0022] When the rotating ring rotates, the motor in the center is started, and the motor drives the driving gear to rotate, and the driving gear drives the driven gear on the outside to rotate. Under the action of the driven gear, it can cooperate with the gear teeth on the inside of the rotating block, and then drive the rotating block on the outside to rotate, so that the rotating ring can be ensured to rotate stably.

[0023] Moreover, this configuration only requires one set of motors to realize the rotation of three sets of blades, which not only ensures the synchronization of the blades, but also requires only one set of adjustment equipment compared to the traditional one, which greatly reduces the cost investment;

[0024] Sealing blocks are also arranged on both sides of the rotating block. When the rotating block rotates, the sealing blocks can move, and one side of the sealing block is in close contact with the mounting frame. At this time, the contact part between the driven gear and the gear teeth can be prevented from being affected by external dust and impurities, thereby ensuring stable cooperation between the driven gear and the gear teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an AC pitch system;

[0026] Figure 2 It is a structural schematic diagram of a power component of an AC pitch system;

[0027] Figure 3 It is a structural schematic diagram of a rotating block of an AC pitch system;

[0028] Figure 4 It is a structural schematic diagram of a limit frame of an AC pitch system;

[0029] Figure 5 This is a schematic diagram of the back structure of a rotating ring of an AC pitch system.

[0030] In the figure: 1. variable pitch fan housing; 2. connecting housing; 3. variable pitch shaft; 4. bevel gear ring; 5. rotating ring; 6. connecting rod; 7. power assembly; 701. mounting frame; 702. motor; 703. driving gear; 704. driven gear; 705. rotating shaft; 706. rotating block; 707. gear teeth; 708. connecting column; 709. sealing block; 8. limiting frame; 801. fixing plate; 802. arc plate; 9. bevel gear teeth; 10. supporting ring. DETAILED DESCRIPTION

[0031] Embodiment 1:

[0032] See also Figure 1 , the present invention provides a technical solution:

[0033] An AC variable pitch system includes a variable pitch fan housing 1 and a connecting housing 2.

[0034] The outer side of the pitch fan housing 1 is fixedly connected with a connecting shell 2, and the side of the connecting shell 2 facing the center of the pitch fan housing 1 is rotatably connected with a pitch shaft 3, and the other side of the pitch shaft 3 is fixedly connected with a bevel gear ring 4, and a rotating ring 5 is provided on the outer side of the bevel gear ring 4, and the inner side of the rotating ring 5 is fixedly connected with a connecting rod 6, and the other side of the connecting rod 6 is fixedly connected with a power assembly 7, and the outer side of the power assembly 7 is fixedly connected to the pitch fan housing 1.

[0035] At present, there are two ways to change the pitch of a wind turbine. One is to use a pitch motor to drive the pitch gear to rotate, and the pitch gear drives the blades of the wind turbine to rotate to adjust the angle. The other is to use hydraulic equipment to pull the pitch shaft to rotate, and then adjust the blade angle. No matter which method is used, three sets of equipment are required to adjust the blade angle separately. This will result in different blade angles once one set of equipment is delayed in starting or fails, which will increase the unbalanced load on the blades of the wind turbine, making it easy for the wind turbine to fail to rotate normally, and even directly cause damage to the blades. When the device is in use, a variable pitch wind turbine housing 1 is provided with a A rotating ring 5 drives three groups of bevel gear rings 4 on the outside of the variable pitch fan housing 1 to rotate through the bevel gear teeth 9 arranged on the outside of the rotating ring 5, so that the bevel gear ring 4 drives the variable pitch shaft 3 to rotate, and the variable pitch shaft 3 drives the blades to rotate. At this time, the three groups of blades can be synchronously pitched through the same rotating ring 5, and there is no problem of inconsistent pitch angles, so the pitch quality can be guaranteed and the wind turbine can be used normally. In addition, this setting only needs one group of motors to realize the rotation of the three groups of blades, which not only ensures the synchronization of the blades, but also compared with the traditional method that requires three groups of adjustment equipment, this device only needs one group, which greatly reduces the cost investment.

[0036] Example 2

[0037] This embodiment is an improvement made to the first embodiment. Figure 1 Specifically, three groups of evenly distributed bevel gear teeth 9 are installed on the outer side of the rotating ring 5, and the rotating ring 5 is meshed with the bevel gear ring 4 through the bevel gear teeth 9.

[0038] This arrangement allows the rotating ring 5 to drive the bevel gear teeth 9 to move when the rotating ring 5 rotates, and the bevel gear teeth 9 can drive the bevel gear ring 4 to rotate. At this time, the three sets of variable pitch shafts 3 can be driven to rotate, thereby realizing three sets of synchronous variable pitch, and it is less likely to have the problem of different variable pitch angles.

[0039] Example 3

[0040] This embodiment is an improvement made to Example 2. Figure 4 and Figure 5 Specifically, an annular groove is opened on the rear side of the rotating ring 5, and a support ring 10 is arranged inside the annular groove. The rotating ring 5 is rotatably connected to the support ring 10 through the annular groove, and the rear side of the support ring 10 is fixedly connected to the variable pitch wind turbine housing 1.

[0041] A limiting frame 8 is arranged on the outer side of the rotating ring 5, and the limiting frame 8 includes a fixed plate 801 and an arc plate 802. One side of the fixed plate 801 is fixedly connected to the variable pitch wind turbine housing 1, and the other end of the fixed plate 801 is fixedly connected to the arc plate 802. The outer side of the fixed plate 801 is in close contact with the rotating ring 5, and the side of the arc plate 802 facing the rotating ring 5 is arranged in an arc surface, and the outer side of the arc plate 802 is slidably connected to the rotating ring 5.

[0042] When the rotating ring 5 rotates, the support ring 10 provided on the rotating ring 5 serves the purpose of supporting the rotating ring 5, and a fixed plate 801 and an arc plate 802 are provided on the other side of the rotating ring 5. The fixed plate 801 is located on the other side of the rotating ring 5 to serve the purpose of support and limitation, and the arc plate 802 contacts the inner side of the rotating ring 5, thereby ensuring that the rotating ring 5 rotates stably and avoiding displacement.

[0043] Example 4

[0044] This embodiment is an improvement made to the implementation example 3, please refer to Figure 2 and Figure 3Specifically, the power assembly 7 includes a mounting frame 701, a motor 702 and a driving gear 703. The outer side of the mounting frame 701 is fixedly connected to the pitch wind turbine housing 1. The interior of the mounting frame 701 is fixedly connected to the motor 702. The outer side of the motor 702 is fixedly connected to the driving gear 703. Three groups of driven gears 704 are meshed on the outer side of the driving gear 703. The center of the driven gear 704 is fixedly connected to a rotating shaft 705. Both ends of the rotating shaft 705 are rotatably connected to the mounting frame 701. A rotating block 706 is arranged on the outer side of the rotating shaft 705. The outer side of the rotating block 706 is fixedly connected to the connecting rod 6. Both ends of the rotating block 706 are fixedly connected to connecting columns 708.

[0045] The rotating block 706 has evenly distributed gear teeth 707 fixedly connected to the inside of one side facing the mounting frame 701 . The rotating block 706 is meshed with the driven gear 704 via the gear teeth 707 .

[0046] When the rotating ring 5 rotates, it starts the central motor 702, and the motor 702 drives the driving gear 703 to rotate, and the driving gear 703 drives the outer driven gear 704 to rotate. Under the action of the driven gear 704, it can cooperate with the gear teeth 707 on the inner side of the rotating block 706, and then drive the outer rotating block 706 to rotate. At this time, the rotating ring 5 can be guaranteed to rotate stably, and the provided connecting column 708 serves the purpose of connecting the rotating block 706, and the three groups of driven gears 704 can drive the three groups of variable pitch shafts 3 on the outer side to rotate synchronously, thereby achieving the purpose of synchronous angle adjustment.

[0047] Example 5

[0048] This embodiment is an improvement made to the implementation example 4, please refer to Figure 2 Specifically, sealing blocks 709 are fixedly connected to both sides of the rotating block 706 , and the inner side of the sealing block 709 is slidably connected to the installation frame 701 .

[0049] Sealing blocks 709 are also provided on both sides of the rotating block 706. When the rotating block 706 rotates, the sealing blocks 709 can move, and one side of the sealing block 709 is in close contact with the mounting frame 701. At this time, the contact part between the driven gear 7044 and the gear teeth 707 can be prevented from being affected by external dust and impurities, thereby ensuring that the driven gear 704 and the gear teeth 707 are stably used in combination.

[0050] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. An AC pitch control system, characterized in that: It comprises a variable pitch fan casing (1) and a connecting casing (2), The outer side of the variable pitch fan housing (1) is fixedly connected to a connecting housing (2); the side of the connecting housing (2) facing the center of the variable pitch fan housing (1) is rotatably connected to a variable pitch shaft (3); the other side of the variable pitch shaft (3) is fixedly connected to a bevel gear ring (4); a rotating ring (5) is provided on the outer side of the bevel gear ring (4); the inner side of the rotating ring (5) is fixedly connected to a connecting rod (6); the other side of the connecting rod (6) is fixedly connected to a power assembly (7); the outer side of the power assembly (7) is fixedly connected to the variable pitch fan housing (1).

2. The AC pitch system according to claim 1, characterized in that: Three groups of evenly distributed bevel gear teeth (9) are installed on the outer side of the rotating ring (5), and the rotating ring (5) is meshed with the bevel gear ring (4) through the bevel gear teeth (9).

3. The AC pitch system according to claim 1, characterized in that: An annular groove is provided on the rear side of the rotating ring (5), and a support ring (10) is arranged inside the annular groove. The rotating ring (5) is rotatably connected to the support ring (10) via the annular groove, and the rear side of the support ring (10) is fixedly connected to the variable pitch fan casing (1).

4. The AC pitch system according to claim 1, characterized in that: A limiting frame (8) is arranged on the outer side of the rotating ring (5), and the limiting frame (8) comprises a fixed plate (801) and an arc plate (802), one side of the fixed plate (801) is fixedly connected to the variable pitch fan housing (1), and the other end of the fixed plate (801) is fixedly connected to the arc plate (802), the outer side of the fixed plate (801) is in close contact with the rotating ring (5), the side of the arc plate (802) facing the rotating ring (5) is arranged in an arc surface, and the outer side of the arc plate (802) is slidably connected to the rotating ring (5).

5. The AC pitch system according to claim 1, characterized in that: The power assembly (7) comprises a mounting frame (701), a motor (702) and a driving gear (703); the outer side of the mounting frame (701) is fixedly connected to the variable pitch wind turbine housing (1); the interior of the mounting frame (701) is fixedly connected to the motor (702); the outer side of the motor (702) is fixedly connected to the driving gear (703); the outer side of the driving gear (703) is meshed with three groups of driven gears (704); the centers of the driven gears (704) are fixedly connected to a rotating shaft (705); both ends of the rotating shaft (705) are rotatably connected to the mounting frame (701); a rotating block (706) is arranged on the outer side of the rotating shaft (705); the outer side of the rotating block (706) is fixedly connected to the connecting rod (6); and both ends of the rotating block (706) are fixedly connected to connecting columns (708).

6. The AC pitch system according to claim 5, characterized in that: Evenly distributed gear teeth (707) are fixedly connected to the inside of one side of the rotating block (706) facing the installation frame (701), and the rotating block (706) is meshed with the driven gear (704) via the gear teeth (707).

7. The AC pitch system according to claim 5, characterized in that: Sealing blocks (709) are fixedly connected to both sides of the rotating block (706), and the inner side of the sealing block (709) is slidably connected to the installation frame (701).

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