CN108397361B - A kind of double-fed fan blade wheel hub axial direction telescopic device and its double-fed blower - Google Patents

Abstract

The invention discloses a double-fed fan blade hub axial expansion device and the double-fed fan, wherein the axial expansion device includes a hub shaft, a telescopic mechanism, a shaft sleeve, a wind speed sensor, a controller and an output shaft, and one end of the hub shaft It is connected with the fan blade, the other end is connected with the telescopic mechanism, the other end of the telescopic mechanism is connected with one end of the output shaft, the other end of the output shaft is connected with the gearbox of the fan, the hub shaft is telescopically inserted into one end of the shaft sleeve and It rotates synchronously with the shaft sleeve, the other end of the shaft sleeve is fixedly connected with the output shaft, the wind speed sensor is connected with the controller, and the controller controls the telescopic mechanism to drive the hub shaft to move forward and backward. The invention can real-time adjust the position of the center of mass of the power generation assembly on the wind turbine tower according to the wind speed outside the wind turbine, so that the center of mass of the power generation assembly is always kept on the central axis of the tower, thereby improving the operation safety and service life of the wind turbine.

Description

A double-fed fan blade hub axial expansion device and double-fed fan

technical field

The invention relates to the technical field of large-scale double-fed fans, in particular to a double-fed fan blade hub axial expansion device and the double-fed fan.

Background technique

At present, in order to develop more powerful wind turbines, it is necessary to increase the blades of the wind turbine and increase the height of the wind turbine tower. The increase in the length of the fan blade will not only lead to a substantial increase in the weight of the blade, but also cause a sharp increase in the horizontal load on the top of the tower when the fan is running; at the same time, the increase in the height of the fan tower will lead to an increase in the flexibility of the tower. The superposition of the above factors reduces the ability of large-scale double-fed wind turbines to resist hurricanes, and it is prone to wind turbine tower collapse accidents, causing hidden dangers to the safe operation of wind turbines.

The structure of a traditional large double-fed fan is shown in Figure 4. The hub shaft 1 connected to the fan blade 6 is directly connected to the input shaft of the gearbox 7, and the distance between the hub shaft 1 and the gearbox 7 is fixed. In order to ensure the safe operation of the wind turbine, the center of mass of the power generation component located at the top of the tower 21 of the wind turbine is designed on the central axis of the tower 21 when designing a traditional large double-fed wind turbine. When the fan is working, the hub shaft 1 receives the axial thrust from the fan blades 6, and the top of the tower 21 will have a horizontal displacement along the wind direction (as shown in Figure 5). The center of mass of the power generation components at the top of 21 will deviate from the central axis of tower 21 (when the wind speed reaches 25 m/s, the deviation of the center of mass of large wind turbines will reach 1000mm), because the power generation components weigh more than 200 tons, so the tower A large breaking moment is formed at the bottom of 21, which can easily cause the tower 21 of the wind turbine to lose stability, lead to the accelerated failure of the supporting connection structure or other components on the wind turbine, and even cause the tower 21 to collapse.

Contents of the invention

The purpose of the present invention is to provide a blade hub axial telescopic device that actively adjusts the position of the center of mass of the fan power generation assembly so that the position of the center of mass of the power generation assembly is always on the central axis of the tower, so as to solve the above problems.

In order to achieve the above object, the present invention firstly discloses a double-fed fan blade hub axial telescopic device, including a hub shaft, a telescoping mechanism, a shaft sleeve, a wind speed sensor, a controller and an output shaft, one end of the hub shaft is connected to the fan blade The other end is connected to the telescopic mechanism, the other end of the telescopic mechanism is connected to one end of the output shaft, the other end of the output shaft is connected to the gearbox of the fan, and the hub shaft is telescopically inserted into the shaft One end of the sleeve and rotates synchronously with the sleeve, the other end of the sleeve is fixedly connected to the output shaft, the wind speed sensor is connected to the controller, and the controller controls the telescopic mechanism to drive the The hub shaft moves back and forth.

Further, the hub shaft is provided with a spline, and the hole where the bushing is socketed with the hub shaft is a spline hole.

Further, the telescoping mechanism is a hydraulic cylinder, the piston rod of the hydraulic cylinder is connected to the hub shaft, and the cylinder body of the hydraulic cylinder is connected to one end of the output shaft.

Further, the bushing includes a hollow inner cavity, the hub axle is located in the inner cavity, and the hub axle is located in the inner cavity and a stop ring is provided to limit the maximum outer diameter of the hub axle. The extension stroke is 1200mm.

Further, the controller is connected with the hydraulic cylinder to drive the piston rod to extend when the wind speed measured by the wind speed sensor increases, and the retraction action of the piston rod is generated by the axial direction of the fan blades. Force-driven retraction.

Further, a wireless communication control method is adopted between the controller and the hydraulic cylinder.

Further, it also includes a hydraulic device arranged in the inner cavity, the hydraulic device includes the hydraulic cylinder, and the bushing is provided with a brush device that transmits the electric power outside the bushing to the hydraulic device.

Further, the thickness of the side wall at one end of the shaft sleeve where the hub shaft is installed is greater than the side wall at one end of the shaft sleeve where the hydraulic cylinder is installed.

Further, a maintenance channel is provided on the side wall of the shaft sleeve.

Then, the present invention discloses a double-fed fan, which includes the axial expansion device for the blade hub of the double-fed fan described in the above solution.

Compared with the prior art, the present invention has the advantages of:

The present invention can real-time adjust the position of the center of mass of the power generation assembly on the wind turbine tower according to the wind speed outside the wind turbine, so that the center of mass of the power generation assembly is always kept on the central axis of the tower, thereby improving the operation safety and service life of the wind turbine and avoiding the wind tower The tower collapse accident caused by the accelerated failure of the supporting connection structure or other components on the wind turbine due to the instability of the frame.

The present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a schematic structural view of a double-fed fan blade hub axial expansion device disclosed in a preferred embodiment of the present invention;

Fig. 2 is a schematic sectional view of A-A of Fig. 1;

Fig. 3 is a schematic diagram of the center of mass adjustment of the doubly-fed fan disclosed in the preferred embodiment of the present invention when the wind speed increases;

Fig. 4 is a schematic diagram of a power generation assembly of an existing fan;

Fig. 5 is a schematic diagram of the change of the center of mass of the existing wind turbine when the wind speed increases.

illustration:

1. Hub shaft; 2. Shaft sleeve; 3. Wind speed sensor; 4. Controller; 5. Output shaft; 6. Fan blade; 7. Gear box; 8. Spline; 9. Spline hole; 10. Hydraulic cylinder 11. Piston rod; 12. Cylinder body; 13. Inner cavity; 14. Limit retaining ring; 15. Brush device; 16. Maintenance channel; 17. Generator; 18. Gear box output shaft; 19. Hydraulic control Valve; 20, hydraulic pump; 21, tower.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

As shown in Figures 1 to 3, the present invention first discloses a double-fed fan blade hub axial expansion device, including a hub shaft 1, a telescopic mechanism, a shaft sleeve 2, a wind speed sensor 3, a controller 4 and an output shaft 5, Wherein, the telescoping mechanism can be pneumatically driven, hydraulically driven, rack and pinion, ball screw or similar mechanism that can complete the telescopic function. In this embodiment, the telescopic mechanism is a hydraulic cylinder 10, the piston rod 11 of the hydraulic cylinder 10 and the hub The shaft 1 is connected, the cylinder body 12 of the hydraulic cylinder 10 is connected with one end of the output shaft 5, that is, when the piston rod 11 rotates, it will not rotate with the cylinder body 12, and one end of the hub shaft 1 is connected with the fan blade 6, and the other end is connected with the The piston rod 11 is connected, the other end of the telescopic mechanism (that is, the cylinder body 12) is connected to one end of the output shaft 5, and the other end of the output shaft 5 is connected to the gearbox 7 of the fan, and the power is passed through the gearbox after the speed is increased by the gearbox 7. The output shaft 18 is input into the generator 17 to realize power generation. Among them, the hub shaft 1 is telescopically inserted into one end of the shaft sleeve 2 and rotates synchronously with the shaft sleeve 2. The connection method can adopt a conventional key fit (such as a conventional rectangular key and keyway fit). In this embodiment In order to ensure the transmission of force between the hub axle 1 and the bushing 2, as well as a more precise matching effect, in this embodiment, a spline fit is adopted between the hub axle 1 and the bushing 2, that is, the hub axle 1 There are splines 8 on the top, and the hole where the hub shaft 2 and the hub shaft 1 are socketed is a spline hole 9, and the torque generated by the wind-driven fan blade 6 is transmitted through the direction of the hub shaft 1-axle sleeve 2-output shaft 5, Wherein, the output end of the shaft sleeve 2 is fixedly connected to the output shaft 5, the wind speed sensor 3 is connected to the controller 4, and the controller 4 controls the telescopic mechanism to drive the hub shaft 1 to move back and forth. In this embodiment, the controller 4 and the hydraulic cylinder 10 adopt a wireless communication control method (using any one of odbus bus, Dp bus, Wifi wireless, and Bluetooth). In this embodiment, the shaft sleeve 2 It includes a hollow inner chamber 13, and a hydraulic device is arranged in the inner chamber 13. The hydraulic device includes a hydraulic cylinder 10, a hydraulic control valve 19 and a hydraulic pump 20. The hydraulic pump 20 drives the hydraulic cylinder 10 to complete the telescopic action, wherein the hydraulic control valve 19 and the hydraulic pump 20 Communication between the controllers 4, so as to establish a connection between the piston rod 11 and the external wind speed, when the wind speed increases, the drive hub shaft 1 stretches out more (as shown in Figure 3, wherein the whole blower machine is assembled in On the rotating shaft seat at the top of the tower 21, the rear part of the fan unit is an empennage, which can automatically adjust its position to align with the wind direction, so that the fan blades 6 always keep the power generation state rotating clockwise against the wind). When the wind speed decreases, the hydraulic pump can 20 is driven to retract, or the hydraulic pump 20 is turned off, and the piston rod 11 is driven to retract through the axial action of the external wind on the hub shaft 1. Since the double-fed fan is connected to the external grid, that is, the external grid can supply power to the inside of the fan. In the embodiment, considering that the shaft sleeve 2 is a rotating part, therefore, the shaft sleeve 2 is provided with a brush device 15, so as to realize the transmission of electric power from the outside of the shaft sleeve 2 to the inside of the shaft sleeve 2, thereby providing power for the hydraulic pump 20 and hydraulic pressure. The control valve 19 and the like are powered. In a windy working environment, when the center of mass of the power generation assembly moves backward, the hub shaft 1 connected to the fan blade 6 is driven to protrude forward. Since the fan blade 6 and the hub shaft 1 of the fan account for a large mass, the That is, the center of mass of the power generation component can be adjusted forward, and the center of mass of the power generation component can be avoided by active adjustment, thereby preventing the tower 21 from forming a large bending moment force at the connection between the tower 21 and the bottom surface caused by the center of mass deviation. Cause failures such as breakage of the bottom connection (especially to avoid accelerated damage to the bottom connection that forms an alternating moment when the wind speed changes), so that the center of mass of the power generation component returns to the original center position of the tower 21. This device adjusts the position of the center of mass of the power generation components on the tower frame 21 of the fan in real time according to the wind speed outside the fan, so that the center of mass of the power generation components is always kept on the central axis of the tower 21, thereby improving the operation safety and service life of the fan, and avoiding the The tower 21 of the wind turbine is unstable, or the supporting connection structure on the wind turbine or the accelerated failure of other components leads to the collapse of the tower 21 .

In this embodiment, according to the actual investigation, the maximum deflection of the large fan under the design wind speed working range is about 1000 mm, so the hub shaft 1 is located in the inner cavity 13 and a limit retaining ring 14 is provided to limit the maximum outer deflection of the hub shaft 1. The extension stroke is 1200mm.

In this embodiment, due to the large mass of the fan blade 6 of the power generation device, the position supporting the fan blade 6 on the shaft sleeve 2 will bear a large bending moment, which is likely to cause failure. Therefore, in actual design, the shaft sleeve 2 is installed The side wall at one end with the hub shaft 1 is thicker than the side wall at the end of the sleeve 2 where the hydraulic cylinder 10 is installed, so as to have better supporting strength.

In this embodiment, a maintenance passage 16 is provided on the side wall of the shaft sleeve 2 , which is convenient for staff to enter and maintain from the maintenance passage 16 .

Then, the present invention discloses a double-fed fan, which includes the above-mentioned axial expansion device for the blade hub of the double-fed fan.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of double-fed fan blade wheel hub axial direction telescopic device, which is characterized in that including hub spindle (1), telescoping mechanism, axle sleeve (2), one end of air velocity transducer (3), controller (4) and output shaft (5), the hub spindle (1) is connect with fan blade (6), The other end is connect with telescoping mechanism, and the other end of the telescoping mechanism is connect with one end of output shaft (5), the output shaft (5) The other end and the gear-box (7) of blower connect, the hub spindle (1) is telescopically plugged in one end of the axle sleeve (2) And with the axle sleeve (2) synchronous rotary, the other end and the output shaft (5) of the axle sleeve (2) are affixed, the air velocity transducer (3) it is connect with the controller (4), the controller (4) controls the telescoping mechanism and drives fortune before and after the hub spindle (1) It is dynamic.

2. double-fed fan blade wheel hub axial direction telescopic device according to claim 1, which is characterized in that the hub spindle (1) it is provided on spline (8), the hole of the axle sleeve (2) and the hub spindle (1) socket is splined hole (9).

3. double-fed fan blade wheel hub axial direction telescopic device according to claim 1, which is characterized in that the telescoping mechanism Piston rod (11) for hydraulic cylinder (10), the hydraulic cylinder (10) is connect with hub spindle (1), the cylinder body of the hydraulic cylinder (10) (12) it is connect with one end of output shaft (5).

4. double-fed fan blade wheel hub axial direction telescopic device according to claim 3, which is characterized in that the axle sleeve (2) It inside include a hollow cavity (13), the hub spindle (1) is located in the inner cavity (13), and the hub spindle (1) is located in described Limit stop ring (14) are provided in chamber, to limit the overhanging stroke of maximum of the hub spindle (1) as 1200mm.

5. according to any double-fed fan blade wheel hub axial direction telescopic device of claim 3-4, which is characterized in that the control Device (4) processed connect with the hydraulic cylinder (10), drives the piston when increasing with the wind speed measured in the air velocity transducer (3) Bar (11) stretches out, and the retract action of the piston rod (11) is retracted by the axial power drive that fan blade (6) generate.

6. double-fed fan blade wheel hub axial direction telescopic device according to claim 5, which is characterized in that the controller (4) wireless telecommunications control mode is used between hydraulic cylinder (10).

7. double-fed fan blade wheel hub axial direction telescopic device according to claim 4, which is characterized in that further include being set to Hydraulic device in inner cavity (13), the hydraulic device include the hydraulic cylinder (10), are provided on the axle sleeve (2) by axle sleeve (2) brushgear (15) in the power Transmission to hydraulic device on the outside of.

8. double-fed fan blade wheel hub axial direction telescopic device according to claim 3, which is characterized in that the axle sleeve (2) The thickness for being equipped with one end side wall of hub spindle (1) is greater than one end side wall that the axle sleeve (2) are equipped with hydraulic cylinder (10).

9. double-fed fan blade wheel hub axial direction telescopic device according to claim 3, which is characterized in that the axle sleeve (2) Side wall on be provided with maintenance channel (16).

10. a kind of double-fed blower, which is characterized in that including the described in any item double-fed fan blade wheels of the claims 1-9 Hub axle is to telescopic device.