Variable speed gearbox for wind turbines

Abstract

The present application relates to the technical field of wind power generation equipment, in particular to a variable speed gearbox for wind driven generator, comprising an external box, an input shaft and an output shaft are extended in the box, the angle between the input shaft and horizontal plane is variable; a total gear set is arranged in the box, which comprises a variable speed gear set and a rotation angle gear set connected with each other, the input shaft is connected with the rotation angle gear set, the output shaft is connected with the variable speed gear set, the rotation angle gear set comprises a rotation angle arc-shaped frame, the input shaft moves along the rotation angle arc-shaped frame or is fixed, the pitch angle adjustment range of the axis is -30°-30°; the variable speed gearbox for wind driven generator is provided with an input shaft with adjustable pitch angle, the pitch angle of the wind wheel connected with the input shaft can be adjusted, different angles of upward and downward oblique wind direction can be adapted, and more wind quantity can be obtained; through the arrangement of the angle detection mechanism, the pitch angle can be monitored in real time, the adjustment amount feedback is provided, and the accurate control of the angle is realized.

Description

Technical Field

[0001] This invention relates to the field of wind power generation equipment technology, and more specifically to a variable speed gearbox for wind turbine generators. Background Technology

[0002] Wind energy is a green energy source that has been vigorously promoted and developed by the country. The rapid development of the wind power generation industry has led to the prosperity of the wind power equipment manufacturing industry. As the core component of wind turbine generator sets, the gearbox converts the slow rotation of the wind turbine into the high-speed rotation required by the generator. However, the input shaft pitch angle of the gearbox used in traditional wind turbine generators cannot be adjusted, which in turn makes it impossible to adjust the pitch angle of the wind turbine. Adjusting the pitch angle of the wind turbine can enable it to obtain a better wind collection angle and improve the efficiency of wind power generation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a variable speed gearbox for wind turbines to improve wind power generation efficiency.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A variable speed gearbox for a wind turbine includes an external housing, from which an input shaft and an output shaft extend, the angle between the input shaft and the horizontal plane being variable; The housing contains a main gear set, which includes a connected transmission gear set and a corner gear set. The input shaft is connected to the corner gear set, and the output shaft is connected to the transmission gear set. The corner gear set includes a corner arc frame. The input shaft moves or is fixed along the corner arc frame, and the pitch angle adjustment range of its axis is -30° to 30°.

[0005] Furthermore, the angle gear set includes a pitch adjustment shaft movably connected to the angle arc frame, with an arc-shaped adjustment platform between them. An angle detection mechanism is also provided between the adjustment platform and the housing. The angle gear set also includes a gear set one, which includes gear A and gear B. Gear A is coaxially connected to the pitch adjustment shaft, and gear B is movably connected to the housing and meshes perpendicularly with gear A. Gear B is also connected to a transmission gear set. The pitch adjustment shaft and gear B in gear set one are connected by a compound rotary support.

[0006] Furthermore, the angle detection mechanism includes an arc-shaped conductive rod and a conductive head slidably connected thereto, and the upper and lower ends of the arc-shaped conductive rod and the conductive head are all connected to the pitch angle detection circuit.

[0007] Furthermore, the composite rotary support includes two mutually perpendicular rotation axes, and one axis can move 360° around the other axis.

[0008] Furthermore, the gear set is a planetary reduction gear set.

[0009] Furthermore, the adjustment platform is equipped with a rotating gear that meshes with the teeth on the corner arc frame.

[0010] Furthermore, the pitch angle detection circuit applies equal voltages to the upper and lower ends of the conductive head and the arc-shaped conductive rod, forming two independent loops, each of which is equipped with a current measuring device.

[0011] Furthermore, the pitch angle detection circuit calculates the ratio of the currents in the two loops to convert it into the pitch angle value of the input axis.

[0012] Furthermore, the input shaft and the pitch adjustment shaft are aligned and move synchronously, and the output shaft rotates at a speed greater than that of the input shaft.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The wind turbine gearbox of this invention has a reasonable structure and low failure rate. By setting an input shaft with adjustable pitch angle, the pitch angle of the connected wind turbine can be adjusted to adapt to different angles of upward and downward wind direction, thereby obtaining more air volume and improving power generation efficiency. By setting an angle detection mechanism, the pitch angle can be monitored in real time and adjustment feedback can be provided to achieve precise control of the angle. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the right-side structure of the present invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 for Figure 1 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the angle detection mechanism in this invention; In the diagram: 1. Housing; 1a. Input shaft; 1b. Output shaft; 2. Main gear set; 2a. Speed ​​change gear set; 2b. Angle gear set; 2b-1. Angle arc frame; 2b-2. Pitch adjustment shaft; 2b-3. Adjustment platform; 2b-4. Angle detection mechanism; 2b-401. Arc-shaped conductive rod; 2b-402. Conductive head; 2b-5. Gear set one; 2b-6. Composite rotary bearing. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. In the description of the present invention, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0016] like Figures 1-4 As shown, the wind turbine gearbox includes an external housing 1, from which an input shaft 1a and an output shaft 1b extend. When assembled and used in a wind turbine, the input shaft 1a connects to the blades, which can also be called wind turbines, and the output shaft 1b connects to the generator. To make the pitch angle of the wind turbine adjustable, thereby adapting to different angles of up and down oblique wind and improving power generation efficiency, the angle between the input shaft 1a and the horizontal plane is variable. The housing 1 houses a main gear set 2, which includes a connected transmission gear set 2a and an angle gear set 2b. The input shaft 1a is connected to the angle gear set 2b, and the output shaft 1b is connected to the transmission gear set 2a. The angle gear set 2b includes an angled arc frame 2b-1. The input shaft 1a moves or is fixed along the angled arc frame 2b-1, and the pitch angle α of its axis is adjustable within a range of -30° to 30°, providing sufficient adjustment. During wind power generation, the torque of the wind turbine is transmitted to the input shaft 1a, and the torque of the input shaft 1a is transmitted to the angle gear set 2b. The torque of gear set 2b is transmitted to gear set 2a, and finally to output shaft 1b. Gear set 2a is a planetary reduction gear set, which transforms the slow rotational motion of the wind turbine into high-speed rotational motion and transmits it to the generator, thereby realizing wind power generation. The rotational speed of output shaft 1b is greater than that of input shaft 1a. The reduction method of planetary reduction gear set utilizes the transmission cooperation between planetary gears and sun gear, as well as between planetary gear shafts. It has a strong reduction ratio and transmission capacity, strong stability, high transmission efficiency, large load capacity, and long service life.

[0017] To achieve pitch angle adjustment of input shaft 1a, the angle gear set 2b includes a pitch adjustment shaft 2b-2 movably connected to the angle arc frame 2b-1. An adjustment platform 2b-3 with an arc-shaped movement path is provided between the two. The axes of input shaft 1a and pitch adjustment shaft 2b-2 are aligned and move synchronously. A rotating gear is installed inside the adjustment platform 2b-3 and meshes with teeth on the angle arc frame 2b-1. When the aforementioned rotating gear rotates, the adjustment platform 2b-3 moves along the angle arc frame 2b-1. To monitor the pitch angle value in real time, adjustment range is also provided. Feedback is provided to achieve precise angle control. An angle detection mechanism 2b-4 is also installed between the adjustment platform 2b-3 and the housing 1. The angle gear set 2b also includes a gear set 2b-5, which includes gear A and gear B. Gear A is coaxially connected to the pitch adjustment shaft 2b-2, and gear B is movably connected to the housing 1 and meshes perpendicularly with the aforementioned gear A. Gear B is also connected to the transmission gear set 2a. The pitch adjustment shaft 2b-2 and gear B in gear set 2b-5 are connected by a compound rotary support 2b-6. Specifically, as shown... Figure 4 As shown, the composite rotary bearing 2b-6 includes two mutually perpendicular rotary axes, one of which can move 360° around the other. The rotary axis for pitch adjustment coincides with the gear axis in gear set 2b-5 that does not directly contact the pitch adjustment shaft 2b-2.

[0018] See details Figure 5 The angle detection mechanism 2b-4 includes an arc-shaped conductive rod 2b-401 and a conductive head 2b-402 slidably connected to it. The upper and lower ends of the arc-shaped conductive rod 2b-401 and the conductive head 2b-402 are all connected to the pitch angle detection circuit. The pitch angle detection circuit applies equal voltages, V1 = V2, between the conductive head 2b-402 and the upper and lower ends of the arc-shaped conductive rod 2b-401, forming two independent loops. Each loop is equipped with a current measuring device to measure I1 and I2 respectively. The arc-shaped conductive rod 2b-401 is divided into upper and lower parts. The longer part has a larger resistance R, so the current I passing through it is smaller. The pitch angle detection circuit calculates the current ratio of the two loops to convert it into the pitch angle value of the input shaft 1a. When I1 = I2, it indicates that the pitch adjustment shaft 2b-2 is in a horizontal position.

[0019] The wind turbine gearbox of this invention, by setting an adjustable pitch input shaft 1a, enables the wind turbine connected to it to have an adjustable pitch angle, adapting to different angles of upward and downward oblique wind, thereby obtaining more air volume and improving power generation efficiency; when the oncoming wind blows upward obliquely, the regulating platform 2b-3 moves downward along the corner arc frame 2b-1, and when the oncoming wind blows downward obliquely, the regulating platform 2b-3 moves upward along the corner arc frame 2b-1.

[0020] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. For those skilled in the art, various changes, modifications or additions made without departing from the concept of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A variable speed gearbox for a wind turbine generator, characterized in that: Includes an external housing (1), from which an input shaft (1a) and an output shaft (1b) extend, the angle between the input shaft (1a) and the horizontal plane being variable; The housing (1) is equipped with a main gear set (2), which includes a connected speed-changing gear set (2a) and a corner gear set (2b). The input shaft (1a) is connected to the corner gear set (2b), and the output shaft (1b) is connected to the speed-changing gear set (2a). The corner gear set (2b) includes a corner arc frame (2b-1). The input shaft (1a) moves or is fixed along the corner arc frame (2b-1), and the pitch angle adjustment range of its axis is -30° to 30°. The angle gear set (2b) includes a pitch adjustment shaft (2b-2) movably connected to the angle arc frame (2b-1), and an arc-shaped adjustment platform (2b-3) is provided between the two. An angle detection mechanism (2b-4) is also provided between the adjustment platform (2b-3) and the housing (1). The angle gear set (2b) also includes a gear set one (2b-5), which includes gear A and gear B. Gear A is coaxially connected to the pitch adjustment shaft (2b-2), and gear B is movably connected to the housing (1) and meshes perpendicularly with gear A. Gear B is also connected to the transmission gear set (2a). The pitch adjustment shaft (2b-2) and gear B in gear set one (2b-5) are connected by a compound rotary support (2b-6).

2. The gearbox for wind turbine generators according to claim 1, characterized in that: The angle detection mechanism (2b-4) includes an arc-shaped conductive rod (2b-401) and a conductive head (2b-402) slidably connected thereon. The upper and lower ends of the arc-shaped conductive rod (2b-401) and the conductive head (2b-402) are all connected to the pitch angle detection circuit.

3. The gearbox for wind turbine generators according to claim 2, characterized in that: The composite rotary support (2b-6) includes two mutually perpendicular rotation axes, one of which can move 360° around the other.

4. The gearbox for wind turbine generators according to claim 1, characterized in that: The gear set (2a) is a planetary reduction gear set.

5. The gearbox for wind turbine generators according to claim 3, characterized in that: The adjustment platform (2b-3) is equipped with a rotating gear that meshes with the teeth on the corner arc frame (2b-1).

6. The gearbox for wind turbine generators according to claim 2, characterized in that: The pitch angle detection circuit applies equal voltages to the upper and lower ends of the conductive head (2b-402) and the arc-shaped conductive rod (2b-401), forming two independent loops, each of which is equipped with a current measuring device.

7. The gearbox for wind turbine generators according to claim 6, characterized in that: The pitch angle detection circuit calculates the ratio of the two loop currents to convert it into the pitch angle value of the input axis (1a).

8. The gearbox for wind turbine generators according to claim 1, characterized in that: The input shaft (1a) and the pitch adjustment shaft (2b-2) are aligned and move synchronously, and the output shaft (1b) rotates at a speed greater than that of the input shaft (1a).

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