[0028] The content of the present invention will be described in detail below in conjunction with the specific embodiments. The specific language or sequence in the specific embodiments is only for explanation and exemplary, and should not have any limiting effect on the protection scope of the present invention.
[0029] Please see figure 1 , figure 1 This is a front view of the generator set provided by the first embodiment of the present invention.
[0030] Such as figure 1 As shown, the generator set includes: wind wheel 1, planet carrier main shaft 2, gear box 3, generator 4, gear box output shaft 5, generator rotor shaft 6, main shaft brake disc 7, sealing sleeve 8, nacelle underframe 9. Tower 10, gearbox support 11, auxiliary bearing 12, main bearing 13, ferrule 14, retaining ring 15, etc.
[0031] The wind wheel 1 includes blades and a hub. Gearbox 3 is a two-stage planetary gearbox with a speed increase ratio of 1:15 to 1:25. The gearbox uses the first-stage planet carrier main shaft 2 as the input shaft, and the second-stage sun gear shaft as the output shaft; The gear ring and the housing in the box adopt a split structure, and a positioning pin is designed between the two; the planet carrier at the input end of the gear box is supported by two bearings, a main bearing 13 and an auxiliary bearing 12. The main bearing 13 is a tapered roller bearing with auxiliary The bearing 12 is a cylindrical roller bearing, and the outer end of the main bearing 13 is provided with a ferrule 14 and a retaining ring 15. The generator is an excitation synchronous motor.
[0032] Such as figure 1 , figure 2 As shown, the hub of the wind wheel 1 is directly connected to the primary planet carrier main shaft 2, the gearbox output shaft 5 and the main shaft brake disc 7 are connected by splines or flat keys, and the main brake disc 7 and the generator rotor shaft 6 are splined or Flat key connection, the generator rotor shaft 6 coaxially wraps the gearbox output shaft 5 in the axial direction; a coaxial sealing tube 8 is provided between the gearbox output shaft 5 and the generator rotor shaft; the gearbox 3 is connected to the generator The machine 4 is positioned by the stop. The end faces of the adjacent ends of the gearbox 3 and the generator 4 are designed as flange-shaped end faces. The two ends are buckled together during installation and fixed by bolts, and the two end faces form a flange connection. A gearbox support 11 is provided at the lower part of the gearbox 3. The gearbox support 11 and the nacelle base 9 are connected by high-strength bolts. The nacelle base 9 is a forward-inclined nacelle base, and the nacelle base 9 is fixed on the tower 10.
[0033] The power generated by the wind wheel 1 is transmitted to the main shaft 2 of the first-stage planet carrier of the gearbox. After the speed is increased by the second-stage planetary gearbox, it is output by the second-stage sun gear shaft of the gearbox, namely the output shaft 5 of the gearbox, and is output by the main shaft brake disc. 7 is transmitted to the generator rotor shaft 6, and the generator rotor shaft 6 starts to rotate.
[0034] In a preferred solution, the gearbox 3 adopts forced thin oil splash lubrication, and is equipped with a high-temperature heat dissipation system and a low-temperature heating system, so that the gear always works in the best environment, and its reliability and life are greatly improved.
[0035] In a preferred solution, the gearbox 3 is equipped with an oil temperature detection sensor, an oil pressure detection sensor and a main bearing temperature detection sensor to quickly detect and diagnose the oil temperature, oil pressure and main bearing temperature in the gearbox, if there is a fault Call the police in time.
[0036] The advantages of the above embodiments are described below.
[0037] The gearbox output shaft 5 and the main shaft brake disc 7 are connected by splines or flat keys. The main brake disc 7 and the generator rotor shaft 6 are connected by splines or flat keys. The generator rotor shaft 6 connects the gearbox output shaft in the axial direction. 5 All are coaxially wrapped, the gearbox 3 and the generator 4 are positioned by the stop, the end faces of the adjacent ends of the gearbox 3 and the generator 4 are equipped with flanges, and the two end faces are connected by flanges. In this way, the gearbox 3 and the generator 4 form a coaxial transmission chain, with a compact overall structure, small volume and light weight.
[0038] A coaxial sealing tube 8 is provided between the gearbox output shaft 5 and the generator rotor shaft. This mechanism enables the dynamic seal of the shaft end of the gearbox output shaft 5 to be set on the outer end of the generator for inspection and replacement. The seal is very easy.
[0039] The nacelle underframe is designed as a forward-extending nacelle underframe, which can bear a large moment, thereby effectively reducing the force on the gearbox housing. This structure can also make the center of gravity of the transmission chain composed of the gearbox 3 and the generator 4 closer to the tower, the tower bears a smaller bending moment, the load at both ends of the gearbox is more balanced, and the load can be directly transmitted to the nacelle The underframe effectively reduces the load of the gearbox housing and the generator housing, and the force condition is improved.
[0040] The gearbox adopts a two-stage planetary gearbox with a transmission ratio of 1:15 to 1:25. The gearbox with this transmission form can achieve a more compact structure under the same speed increase ratio. Smaller size and lighter weight; the rated speed of the gearbox output shaft 5, namely the high-speed shaft, is only 375rpm, so that the speed is low, the noise is small, and the life is long.
[0041]The planet carrier of the gearbox adopts the supporting mechanism of two bearings: main bearing 13 and auxiliary bearing 12. At the same time, the inner ring gear of the gearbox and the gearbox housing adopt a split structure, and the positioning is designed between the inner ring gear of the gearbox and the gearbox housing. pin. With this structure, the planet carrier is well loaded, and the axial and radial forces caused by the aerodynamic load and weight of the wind wheel are transmitted to the gear through the gear box planet carrier 2, the retaining ring 15, the main bearing 13, the sleeve diagram 14, and the auxiliary bearing 12. The housing of the box 3 transmits the load to the nacelle underframe 9 and the tower 10 through the gear box support 11, so that the gears in the gear box are less stressed, run more smoothly, and have lower noise.
[0042] The above-mentioned embodiment is only a preferred embodiment of the present invention, and it should be clear that this embodiment can be further improved if the above-mentioned ideas are satisfied. For example, the gearbox can adopt a multi-stage planetary gearbox, the main shaft of the planet carrier is the input shaft of the gearbox, the last stage sun gear shaft is the output shaft of the gearbox, the wind wheel hub is directly connected to the first stage planet carrier of the gearbox, and the gearbox output The shaft is connected with the main brake disc by splines, and the main brake disc is connected with the generator rotor shaft by a flat key; the number of lower supports of the gear box is unlimited and can be four or six, as long as the gear box and the nacelle base can be guaranteed It is sufficient to connect firmly; the bearings selected for the main bearing 13 and the auxiliary bearing 12 are not limited to the above-mentioned two kinds of bearings.
[0043] In the above embodiment, the rotor shaft of the generator is all coaxially wrapped around the output shaft of the gearbox in the axial direction, and the output shaft of the gearbox and the main shaft brake disc are connected by splines or flat keys. The present invention also includes the case where the generator rotor shaft coaxially wraps the output shaft of the gearbox in the axial direction. The second embodiment briefly introduces this case.
[0044] Please see image 3 , image 3 This is a view of the generator rotor shaft coaxially wrapping the gearbox output shaft in the second embodiment of the present invention.
[0045] Such as image 3 As shown, the generator rotor shaft 6 partially wraps the gearbox output shaft 5-1 in the axial direction, the generator rotor shaft 6 and the gearbox output shaft 5-1 are connected by a key, and the outer end of the generator rotor shaft is connected to The spindle brake disc 7 is connected by a key. The rest of the specific implementation process of this embodiment is similar to that of the first embodiment, and will not be described in detail here.
[0046] In the above two embodiments, the end faces of the adjacent ends of the gearbox 3 and the generator 4 are designed as flange-shaped end faces, and the two end faces are buckled together and fixed with bolts to form a flange connection. The third embodiment has this structure Made improvements.
[0047] Please see Figure 4 , Figure 4 It is a schematic diagram of a wind power generating set provided by the third embodiment of the present invention. The structure and connection relationship of the wind wheel 1, the gear box 3 and the generator 4 in this embodiment are similar to those of the above two embodiments, and will not be described in detail here.
[0048] Such as Figure 4 As shown, a cylindrical flange 16 is provided on the nacelle base, one end of the cylindrical flange is installed with a gear box 3, and the other end is installed with a generator 4. The hub of the wind wheel 1 is directly connected with the primary planet carrier main shaft 2, the gearbox output shaft 5 and the main shaft brake disc 7 are connected by splines or flat keys, and the main brake disc 7 and the generator rotor shaft 6 are splined or flat keys. Connected, the generator rotor shaft 6 coaxially wraps the gearbox output shaft 5, a coaxial sealing tube 8 is provided between the gearbox output shaft 5 and the generator rotor shaft, and the gearbox 3 and the generator 4 are positioned by the stop . When the generator rotor shaft 6 coaxially wraps the gearbox output shaft 5-1, the main brake disc 7 and the generator rotor shaft 6 are connected by splines or flat keys, and the motor rotor shaft 6 and the gearbox output shaft 5-1 Through spline or flat key. The adjacent ends of the gearbox 3 and the generator 4 are installed on a cylindrical flange, and the large cylindrical flange can ensure the coaxiality of the gearbox and the generator. With this mechanism, the axial and radial forces caused by the aerodynamic load and weight of the wind turbine are directly transmitted to the nacelle underframe, with reasonable force, while ensuring a more compact structure, small overall volume and light weight.
[0049] The cylindrical flange 16 and the nacelle base 9 can be designed as a whole, the cylindrical flange 16 and the nacelle base 9 can also be independent of each other, and the cylindrical flange is fixed on the nacelle base 9 by bolts. In order to strengthen the stability of the cylindrical flange, ribs are arranged between the cylindrical flange and the nacelle base.
[0050] The above is only a description of the preferred embodiments of the present invention. It should be pointed out that due to the limitation of textual expression, there are objectively unlimited specific structures. For those of ordinary skill in the art, it should be noted that without departing from the present invention Under the premise of the principle, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.
