Yaw system for downwind wind driven generator and downwind wind driven generator

Abstract

The utility model relates to the technical field of production of downwind wind driven generators, and aims to solve the technical problems of inaccurate wind alignment and larger deflection of fan blades. In order to solve the technical problem, the utility model provides the yaw system for the downwind wind driven generator and the downwind wind driven generator. The wind wheel assembly comprises a box body, a rotating shaft and a plurality of wind wheel blades; the rotating shaft is rotationally connected into the box body; the axes of the rotating shaft and the main shaft of the wind driven generator are parallel; the multiple wind wheel blades are arranged on the rotating shaft in the circumferential direction. The upper surface of the box is higher than the axis of the rotating shaft; an intermediate connection assembly; the yaw assembly comprises a first gear and a second gear; the rotating shaft is connected with the first gear through the middle connecting assembly, and the second gear is meshed with the first gear. The wind direction can be accurately aligned, and the problem that the deflection amount of the fan blades is large is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the production technical field of downwind wind driven generator, especially a yaw system for downwind wind driven generator and downwind wind driven generator. BACKGROUND

[0002] Wind power generation is a kind of clean and renewable energy, which converts the kinetic energy of wind into electric energy, and is very environmentally friendly. Wind power generation is gaining increasing attention from countries around the world because of its huge wind energy reserves. Wind turbine generator set absorbs wind energy through fan blades, and transmits the absorbed wind energy to the generator shaft end through the transmission system, and converts mechanical energy into electric energy through the generator.

[0003] The wind turbine generator set includes a yaw system, also known as a wind direction system or azimuth control system. The yaw system is located between the tower drum and the main frame. The main function of the yaw system is to control the direction of the entire fan body and fan blades by sensing the wind direction signal of the wind field, to ensure that the fan blades always face the direction of the wind, to maximize the capture of wind energy, and to achieve efficient and stable power generation.

[0004] However, the existing yaw system has the problems of inaccurate wind direction and large fan blade yawing amount. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model solves the above-mentioned problems in the prior art.

[0006] To solve the above-mentioned technical problems, the utility model provides a yaw system for downwind wind driven generator, which comprises:

[0007] The wind wheel assembly comprises a box body, a rotating shaft and a plurality of wind wheel blades. The rotating shaft is rotatably connected in the box body. The rotating shaft and the main shaft of the wind driven generator are parallel in axis. The plurality of wind wheel blades are circumferentially arranged on the rotating shaft. The upper surface of the box body is higher than the axis of the rotating shaft.

[0008] The intermediate connecting assembly comprises a transmission component and a speed reducer. One end of the transmission component is connected with the rotating shaft, and the other end of the transmission component is connected with the input end of the speed reducer. The output end of the speed reducer is connected with the first gear.

[0009] The yaw assembly comprises a first gear and a second gear. The rotating shaft is connected with the first gear through the intermediate connecting assembly, and the second gear is engaged with the first gear.

[0010] In one embodiment of the utility model, the distance between the lower surface of the box body and the axis of the rotating shaft is greater than the distance between the free end of the wind wheel blade and the axis of the rotating shaft.

[0011] In one embodiment of the utility model, the intermediate connecting assembly comprises a transmission component and a speed reducer. One end of the transmission component is connected with the rotating shaft, and the other end of the transmission component is connected with the input end of the speed reducer. The output end of the speed reducer is connected with the first gear.

[0012] In one embodiment of the utility model, the transmission component comprises a first wheel, a second wheel and a transmission member; the first wheel is coaxially connected with the rotating shaft, the second wheel is coaxially connected with the input end of the speed reducer, and the transmission member connects the first wheel and the second wheel.

[0013] In one embodiment of the utility model, the first wheel and the second wheel are respectively pulleys, and the transmission member is a belt.

[0014] In one embodiment of the utility model, the first wheel and the second wheel are respectively gears, and the transmission member is a chain.

[0015] In one embodiment of the utility model, the rotating shaft is rotatably connected with the box through a bearing.

[0016] In one embodiment of the utility model, a plurality of wind wheel blades are evenly arranged on the rotating shaft in the circumferential direction.

[0017] The utility model also provides a downwind wind driven generator, which comprises:

[0018] A fan blade;

[0019] A hub;

[0020] A nacelle comprising a main shaft, a gear box and a generator; one end of the main shaft is connected with the fan blade through the hub; the other end of the main shaft is connected with one end of the gear box, and the other end of the gear box is connected with the generator;

[0021] The yaw system in any one of the above embodiments is connected with the nacelle; one part of the intermediate connecting assembly is connected with the wind wheel assembly outside the nacelle, and the other part is located in the nacelle and connected with the first gear;

[0022] A tower pole is located at the bottom of the nacelle, and the top end of the tower pole is connected with the second gear.

[0023] In one embodiment of the utility model, the wind wheel assembly is connected at the top of the nacelle.

[0024] Compared with the prior art, the above technical scheme of the utility model has the following advantages:

[0025] The yaw system for the downwind wind turbine and the downwind wind turbine, the yaw system of the embodiment is provided with a wind wheel assembly and an intermediate connecting assembly, so that when the direction of the wind speed vector changes, the wind wheel blades of the wind wheel assembly will rotate under the driving of the wind force, and then the rotating power is transmitted to the first gear of the yaw assembly under the transmission of the intermediate connecting assembly, so that the second gear is driven to rotate to realize wind alignment. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to make the content of the utility model more easily be clearly understood, the following is according to the specific embodiment of the utility model and combines the drawings, and the utility model is further detailed, wherein:

[0027] Figure 1 It is a structure schematic view of the downwind wind turbine in the preferred embodiment of the utility model;

[0028] Figure 2 It is Figure 1 The structure schematic view of the wind wheel assembly in the downwind wind turbine;

[0029] Figure 3 It is Figure 1 The schematic view of the wind wheel assembly in the downwind wind turbine in zero wind resistance state;

[0030] Description of the Drawings: 100, fan blade;

[0031] 200, hub;

[0032] 300, nacelle;

[0033] 400, yaw system;410, wind wheel assembly;411, box;412, rotating shaft;413, wind wheel blade;420, intermediate connecting assembly;421, speed reducer;422, first wheel part;423, second wheel part;424, transmission part;430, yaw assembly;431, first gear;432, second gear;

[0034] 500, tower. DETAILED DESCRIPTION

[0035] The utility model is further explained in connection with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0036] In some comparative examples, the existing yaw device includes a wind vane, a control circuit, a yaw motor and a gear. The wind vane, as a sensing element, transmits the change of wind direction to the processor of the control circuit of the yaw motor by an electric signal, and after comparison, the processor sends a yaw command to the yaw motor to rotate clockwise or counterclockwise, the yaw motor drives the gear to rotate, thereby driving the wind turbine blades to yaw against the wind. When the wind-against is completed, the wind vane loses the electric signal, the motor stops working, and the yaw process ends. However, in actual use, the tower cannot automatically against the wind due to the wind direction; or the wind turbine blades are not well balanced; or the wind turbine blades have gyroscopic force due to the variable pitch; which will cause the wind-against to be inaccurate or the wind turbine blades to have a large yawing amount.

[0037] To solve the above problems, with reference to Figures 1-3 The utility model embodiment provides a downwind wind turbine, comprising: wind turbine blades 100, a hub 200, a nacelle 300, a yaw system 400 and a tower 500. Among them:

[0038] The nacelle 300 includes a main shaft, a gear box and a generator (the main shaft, the gear box and the generator are conventional structures in the nacelle 300, and the three are not shown in the figure) ; One end of the main shaft is connected with the wind turbine blades 100 through the hub 200; The other end of the main shaft is connected with one end of the gear box, and the other end of the gear box is connected with the generator.

[0039] The yaw system 400 includes a wind wheel assembly 410, an intermediate connecting assembly 420 and a yaw assembly 430.

[0040] The wind wheel assembly 410 includes a box body 411, a rotating shaft 412 and a plurality of wind wheel blades 413; The rotating shaft 412 is rotatably connected in the box body 411; The rotating shaft 412 and the main shaft of the wind turbine are parallel in axis; A plurality of wind wheel blades 413 are circumferentially arranged on the rotating shaft 412; The upper surface of the box body 411 is higher than the axis of the rotating shaft 412. The yaw assembly 430 includes a first gear 431 and a second gear 432; The rotating shaft 412 is connected with the first gear 431 through the intermediate connecting assembly 420, and the second gear 432 is engaged with the first gear 431. The wind wheel assembly 410 is connected to the nacelle 300; A part of the intermediate connecting assembly 420 extends out of the nacelle 300 and is connected with the wind wheel assembly 410, and the other part is located in the nacelle 300 and is connected with the first gear 431;

[0041] The tower 500 is located at the bottom of the nacelle 300, and the top end of the tower 500 is connected with the second gear 432.

[0042] Specifically, the yaw system 400 of the embodiment is provided with a wind wheel assembly 410 and an intermediate connecting assembly 420, so that when the direction of the wind speed vector changes, the wind wheel blades 413 of the wind wheel assembly 410 rotate under the driving of the wind force, and then the power is transmitted to the first gear 431 of the yaw assembly 430 through the intermediate connecting assembly 420, so as to drive the second gear 432 to rotate to realize the wind alignment. When the wind turbine blades 100 are aligned with the wind direction, the wind wheel blades 413 are in a zero wind resistance state, and the wind wheel blades 413 and the rotating shaft 412 will not rotate. As can be seen, the power for the wind alignment of the present application comes from the wind power of the rotation of the wind turbine blades 100, and the amount of yaw of the wind turbine blades 100 is determined by the wind direction and the wind power. Therefore, the present application can accurately align the wind direction so that the wind turbine blades 100 can obtain the maximum wind energy, and the problem of large yaw amount of the wind turbine blades 100 does not occur.

[0043] Further, the distance L1 between the lower surface of the box body 411 and the axis of the rotating shaft 412 is greater than the distance L2 between the free end of the wind wheel blade 413 and the axis of the rotating shaft 412.

[0044] Specifically, the embodiment makes the wind wheel blades 413 not contact the lower surface of the box body 411 during rotation, thereby improving the efficiency of power transmission.

[0045] Further, the intermediate connecting assembly 420 includes a transmission component and a speed reducer 421; one end of the transmission component is connected with the rotating shaft 412, and the other end of the transmission component is connected with the input end of the speed reducer 421; the output end of the speed reducer 421 is connected with the first gear 431. In some embodiments, the axis of the output shaft of the speed reducer 421 is perpendicular to the axis of the input shaft.

[0046] Specifically, the connection between the wind wheel assembly 410 and the yaw assembly 430 of the embodiment is realized through the transmission component and the speed reducer 421. The transmission component realizes the connection between the rotating shaft 412 and the speed reducer 421. The speed reducer 421 has the functions of reducing the rotating speed and increasing the torque, so as to transmit the power with fast rotating speed and small torque of the wind wheel assembly 410 to the yaw assembly 430 with small rotating speed and large torque.

[0047] Further, the transmission component includes a first wheel member 422, a second wheel member 423 and a transmission member 424; the first wheel member 422 is coaxially connected with the rotating shaft 412, the second wheel member 423 is coaxially connected with the input end of the speed reducer 421, and the transmission member 424 connects the first wheel member 422 and the second wheel member 423.

[0048] In some embodiments, the first wheel member 422 and the second wheel member 423 are respectively a belt wheel, and the transmission member 424 is a belt.

[0049] In some other embodiments, the first wheel member 422 and the second wheel member 423 are gears respectively, and the transmission member 424 is a chain.

[0050] Specifically, the structure of the embodiment is simple, and the operation is reliable.

[0051] Further, the rotating shaft 412 is rotatably connected with the box 411 through a bearing.

[0052] Specifically, the rotating connection between the rotating shaft 412 and the box 411 in the embodiment is realized through a bearing, which is low in manufacturing cost and stable in structure.

[0053] Further, the plurality of wind wheel blades 413 are evenly arranged on the rotating shaft 412 in the circumferential direction.

[0054] Specifically, the even distribution of the plurality of wind wheel blades 413 can improve the ability of the wind wheel blades 413 to capture wind energy and improve the stability of the rotation of the wind wheel blades 413.

[0055] Further, the wind wheel assembly 410 is connected to the top of the nacelle 300.

[0056] Specifically, this layout is more convenient for converting wind power into power of the yaw assembly 430, and in addition, this layout is more reasonable.

[0057] Obviously, the above embodiments are only examples for clearly illustrating, and are not intended to limit the embodiments. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A yaw system for a downwind wind turbine, characterized in that: The yaw system comprises: a wind wheel assembly, comprising a box, a rotating shaft and a plurality of wind wheel blades; the rotating shaft is rotatably connected in the box; the rotating shaft and a main shaft of the wind turbine have parallel axes; the plurality of wind wheel blades are circumferentially arranged on the rotating shaft; an upper surface of the box is higher than the axis of the rotating shaft; an intermediate connecting assembly; a yaw assembly, comprising a first gear and a second gear; the rotating shaft is connected with the first gear through the intermediate connecting assembly; the second gear is engaged with the first gear.

2. A yaw system for a downwind wind turbine according to claim 1, characterized in that: The distance between the lower surface of the box and the axis of the rotating shaft is greater than the distance between the free end of the wind wheel blade and the axis of the rotating shaft.

3. A yaw system for downwind wind turbines according to claim 1, characterized in that: The intermediate connecting assembly comprises a transmission component and a speed reducer; one end of the transmission component is connected with the rotating shaft, and the other end of the transmission component is connected with the input end of the speed reducer; the output end of the speed reducer is connected with the first gear.

4. A yaw system for a downwind wind turbine according to claim 3, characterized in that: The transmission component comprises a first wheel, a second wheel and a transmission member; the first wheel is coaxially connected with the rotating shaft; the second wheel is coaxially connected with the input end of the speed reducer; the transmission member connects the first wheel and the second wheel.

5. A yaw system for a downwind wind turbine according to claim 4, characterized in that: The first wheel and the second wheel are respectively pulleys, and the transmission member is a belt.

6. A yaw system for a downwind wind turbine according to claim 4, characterized in that: The first wheel and the second wheel are respectively gears, and the transmission member is a chain.

7. A yaw system for downwind wind turbines according to claim 1, characterized in that: The plurality of wind wheel blades are circumferentially and uniformly arranged on the rotating shaft.

8. A yaw system for downwind wind turbines according to claim 1, characterized in that: The rotating shaft is rotatably connected with the box through a bearing.

9. A downwind wind turbine, characterized by: The yaw system comprises: a wind turbine blade; a hub; a nacelle, comprising a main shaft, a gear box and a generator; one end of the main shaft is connected with the wind turbine blade through the hub; a connection, the other end of the main shaft is connected with one end of the gear box, and the other end of the gear box is connected with the generator; The yaw system according to any one of claims 1-8, wherein the wind wheel assembly of the yaw system is connected to the nacelle; a part of the intermediate connecting assembly of the yaw system extends out of the nacelle and is connected with the wind wheel assembly, and the other part is located in the nacelle and is connected with the first gear; a tower, located at the bottom of the nacelle, and the top end of the tower is connected with the second gear.

10. A downwind wind turbine according to claim 9, characterised in that: The wind wheel assembly is connected to the top of the nacelle.

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