Small wind driven generator

Abstract

The utility model discloses a small-sized wind driven generator which comprises a tower footing, a tower drum and a cabin arranged on the tower drum, a generator set is arranged in the cabin, a hub is arranged at one end of the cabin, fan blades are arranged on the hub, a gear box is arranged in the cabin, a main shaft is arranged at the input end of the gear box, and the main shaft is arranged at the output end of the gear box. The main shaft and the hub are connected and rotate integrally, an output shaft is arranged at the output end of the gearbox, and the output shaft is connected with a rotor of the generator set. The gearbox comprises a lower shell fixed to a cabin bottom plate of the cabin, an upper shell combined with the lower shell and a gear set located in a containing space defined by the upper shell and the lower shell. According to the small-sized wind driven generator, speed amplification of the fan blades is achieved through the parallel gear sets, the structural design is relatively simple, the small-sized wind driven generator is only composed of the multiple sets of parallel gears and the bearings which are meshed, the number of parts is small, and assembling and centering are easy.

Description

Technical Field

[0001] The utility model relates to a wind power generation device, in particular to a small wind power generator. Background Art

[0002] Wind power generation is a clean and renewable energy source. More and more countries and regions are using wind power generation to reduce their dependence on fossil fuels, reduce carbon emissions, and promote the development of green energy. A wind turbine is a device that converts wind energy into electrical energy. It usually includes a tower base, a tower, and a nacelle arranged on the tower. A hub is arranged at one end of the nacelle, and a fan blade is arranged on the hub. The fan blade rotates under the action of wind to drive the rotor of the generator set, thereby generating electricity. Specifically, when the hub rotates, it is connected to the generator set through the main shaft. Depending on the installed capacity, a gearbox, a pitch system, a yaw system, etc. are usually arranged between the main shaft and the generator set, wherein the function of the gearbox is to convert the low-speed and high-torque rotational motion of the fan blades into a high-speed and low-torque motion to drive the generator. Therefore, general wind turbines are equipped with gearboxes. However, for some small wind turbines, the pitch system and the yaw system are not necessary. Among the common gearbox structures at present, most are planetary gearboxes, whose basic structure consists of a sun gear, planetary gears, planetary carriers, and ring gears. Planetary gearboxes are characterized by high torque density, compact structure, and high transmission efficiency, so they are widely used in wind turbines. However, their structure includes multiple components such as sun gears, planetary gears, ring gears, planetary carriers, and bearings. They are relatively complex in structure, and require higher manufacturing and assembly precision. In addition, bearings and gears are unevenly loaded, easily damaged, and difficult to maintain. Utility Model Content

[0003] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a small wind turbine generator which is simple in structure and easy to maintain. The wind turbine generator has a gear box structure with a simpler structure.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a small wind turbine generator on one hand, including a tower base, a tower and a nacelle arranged on the tower, wherein a generator set is arranged in the nacelle, a hub is arranged at one end of the nacelle, and a wind turbine blade is arranged on the hub, wherein a gear box is arranged in the nacelle, a main shaft is arranged at the input end of the gear box, the main shaft is connected to the hub and rotates as a whole, an output shaft is arranged at the output end of the gear box, and the output shaft is connected to the rotor of the generator set; the gear box includes a lower shell fixed on the nacelle bottom plate of the nacelle and an upper shell combined with the lower shell, and a accommodating space defined by the upper shell and the lower shell A gear set in the space, a main shaft gear is provided at one end of the main shaft located in the accommodating space, a second transmission gear is provided at one end of the output shaft located in the accommodating space, the gear set includes a plurality of parallel gear sets meshing with each other, each parallel gear set includes a first transmission gear and a second transmission gear coaxially connected, the second transmission gear of the parallel gear set close to the main shaft meshes with the main shaft gear, the first transmission gear of the parallel gear set close to the output shaft meshes with the second transmission gear on the output shaft, and two adjacent parallel gear sets are meshed and connected with the second transmission gear of another parallel gear set through the first transmission gear.

[0005] In the present invention, the gear set is used to amplify the rotation speed of the fan blades, so that the speed output to the generator is greatly increased. Therefore, through the step-by-step amplification of the multi-stage parallel gear set, the high-speed rotation of the generator rotor can be achieved. Specifically, the speed ratio of each parallel gear set is between 50:1 and 100:1.

[0006] In the utility model, specifically, a first bearing for supporting the main shaft is provided on a side of the lower housing close to the main shaft, and correspondingly, a second bearing for supporting the output shaft is provided on a side close to the output shaft.

[0007] In some other embodiments, preferably, the first transmission gear and the second transmission gear of the parallel gear set are connected via a transmission shaft.

[0008] Preferably, a second bearing is provided on the transmission shaft, and correspondingly, a bearing seat for fixing the second bearing is provided in the lower shell.

[0009] Preferably, a brake disc for deceleration is provided on the output shaft.

[0010] Preferably, an anemometer and wind direction instrument is provided outside the cabin.

[0011] Compared with the prior art, the small wind turbine provided by the utility model realizes the speed amplification of the wind turbine blades through the parallel gear set, and the structural design is relatively simple, consisting only of multiple sets of meshing parallel gears and bearings, with a small number of parts, and easy assembly and alignment. In addition, the processing accuracy requirements are relatively low, and the manufacturing cost of the parallel shaft gear is lower than that of the planetary gear system (which needs to ensure that multiple planetary gears are evenly stressed).

[0012] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0013] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the structure of a small wind turbine.

[0015] Figure 2 It is a structural schematic diagram of the transmission mechanism of the small wind turbine generator of the present utility model (including the hub and the generator assembly).

[0016] Figure 3 The utility model is a schematic diagram of the internal structure of the transmission mechanism of the small wind turbine generator.

[0017] Figure 4 It is a three-dimensional exploded structural schematic diagram of the transmission mechanism of the small wind turbine generator of the utility model.

[0018] Figure 5 The utility model is a schematic diagram of the top view of the gear set of the transmission mechanism of the small wind turbine generator.

[0019] Figure 6 It is a three-dimensional structural schematic diagram of the gear set of the transmission mechanism of the small wind turbine generator of the utility model.

[0020] In the figure:

[0021] 1-tower base; 2-tower; 3-hub; 4-fan blades; 5-cabin; 6-wind speed and direction instrument; 7-brake disc; 8-generator set; 10-transmission mechanism; 51-cabin bottom plate; 101-upper shell; 102-lower shell; 103-main shaft; 104-transmission shaft; 105-first bearing; 106-output shaft; 107-main shaft gear; 108-first transmission gear; 109-second transmission gear; 110-second bearing; 1021-bearing seat. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure more clear, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure.

[0023] Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0024] like Figures 1 to 6 As shown, in order to achieve the above-mentioned purpose, the utility model provides a small wind turbine generator, including a tower base 1, a tower 2 and a nacelle 5 arranged on the tower 2, wherein a generator set 8 is arranged in the nacelle 5, a hub 3 is arranged at one end of the nacelle 5, and a wind turbine blade 4 is arranged on the hub 3, wherein a gear box (not marked in the figure) is arranged in the nacelle 5, a main shaft 103 is arranged at the input end of the gear box, the main shaft 103 is connected to the hub 3 and rotates as a whole, an output shaft 106 is arranged at the output end of the gear box, and the output shaft 106 is connected to the rotor of the generator set 8; the gear box includes a lower shell 102 fixed on the nacelle bottom plate 51 of the nacelle 5 and an upper shell 101 combined with the lower shell 102, and a gear box located between the upper shell 101 and the lower shell 10 2, a main shaft gear 107 is arranged at one end of the main shaft 103 located in the accommodating space, a second transmission gear 109 is arranged at one end of the output shaft 106 located in the accommodating space, the gear set includes a plurality of mutually meshing parallel gear sets (not marked), each parallel gear set includes a first transmission gear 108 and a second transmission gear 109 coaxially connected, the second transmission gear 109 of the parallel gear set close to the main shaft 103 is meshed with the main shaft gear 107, the first transmission gear 108 of the parallel gear set close to the output shaft 106 is meshed with the second transmission gear 109 on the output shaft 106, and two adjacent parallel gear sets are meshed and connected with the second transmission gear 109 of the other parallel gear set through the first transmission gear 108.

[0025] In the present invention, the gear set is used to amplify the rotation speed of the fan blades, so that the speed output to the generator is greatly increased. Therefore, through the step-by-step amplification of the multi-stage parallel gear set, the high-speed rotation of the generator rotor can be achieved. Specifically, the speed ratio of each parallel gear set is between 50:1 and 100:1. Figures 3 to 6In the exemplary structure shown, three identical parallel gear sets are provided, and the first transmission gear 108 and the second transmission gear 109 of each parallel gear set are connected by a transmission shaft 104. A second bearing 110 is provided on the transmission shaft 104. A second bearing 110 for supporting the output shaft 106 is also provided on the side close to the output shaft 106. Similarly, a first bearing 105 for supporting the main shaft 103 is provided on the side close to the main shaft 103 of the lower housing 102.

[0026] In addition, if Figure 4 As shown, after being amplified by the gear box, the speed of the output end is very fast. If maintenance is required, the system may need to be temporarily suspended. Therefore, a brake disc 7 for deceleration is provided on the output shaft 106. At the same time, in order to measure wind speed and wind direction, an anemometer 6 is provided outside the nacelle 5.

[0027] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A small wind turbine generator, comprising a tower base (1), a tower (2) and a nacelle (5) arranged on the tower (2), wherein a generator set (8) is arranged in the nacelle (5), a hub (3) is arranged at one end of the nacelle (5), and a wind turbine blade (4) is arranged on the hub (3), characterized in that: A gearbox is arranged in the nacelle (5); a main shaft (103) is arranged at the input end of the gearbox, the main shaft (103) is connected to the wheel hub (3) and rotates integrally therewith; an output shaft (106) is arranged at the output end of the gearbox, the output shaft (106) is connected to the rotor of the generator set (8); the gearbox comprises a lower shell (102) fixed to a nacelle bottom plate (51) of the nacelle (5), an upper shell (101) combined with the lower shell (102), and a gear set located in a receiving space defined by the upper shell (101) and the lower shell (102); a main shaft gear (107) is arranged at one end of the main shaft (103) located in the receiving space; the output shaft (106) is connected to the rotor of the generator set (8); 06) A second transmission gear (109) is provided at one end located in the accommodating space, and the gear set includes a plurality of mutually meshing parallel gear sets, each parallel gear set includes a first transmission gear (108) and a second transmission gear (109) coaxially connected, the second transmission gear (109) of the parallel gear set close to the main shaft (103) meshes with the main shaft gear (107), the first transmission gear (108) of the parallel gear set close to the output shaft (106) meshes with the second transmission gear (109) on the output shaft (106), and between two adjacent parallel gear sets, the first transmission gear (108) is meshed and connected with the second transmission gear (109) of the other parallel gear set.

2. The small wind turbine according to claim 1, characterized in that: A first bearing (105) for supporting the main shaft (103) is provided on a side of the lower housing (102) close to the main shaft (103), and correspondingly, a second bearing (110) for supporting the output shaft is provided on a side close to the output shaft (106).

3. The small wind turbine according to claim 1, characterized in that: The first transmission gear (108) and the second transmission gear (109) of the parallel gear set are connected via a transmission shaft (104).

4. The small wind turbine generator according to claim 3, characterized in that: A second bearing (110) is arranged on the transmission shaft (104), and correspondingly, a bearing seat (1021) for fixing the second bearing (110) is arranged in the lower housing (102).

5. The small wind turbine generator according to claim 1, characterized in that: A brake disc (7) for deceleration is arranged on the output shaft (106).

6. The small wind turbine generator according to claim 1, characterized in that: An anemometer and wind direction instrument (6) is arranged outside the nacelle (5).

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