CN201786569U - Wind generating set - Google Patents

Abstract

The utility model discloses a wind generating set comprising a wind wheel (21), a main shaft (22), and a speed-increasing gearbox (25), wherein the main shaft (22) is connected to the wind wheel (21) and an input shaft (251) of the speed-increasing gearbox (25) at two ends thereof respectively, the main shaft (22) being supported by one duel-row tapered roller bearing (29) which is fixed inside a bearing seat (23), the bearing seat (23) being mounted on a main frame (24) of the wind generating set. The wind generating set of the utility model has the advantages of efficient power generation, rational layout, tight structure, light weight, and more convenient transportation and lifting.

Description

Wind Turbine

technical field

The utility model relates to the technical field of wind power generation, in particular to a wind power generating set.

Background technique

As social energy issues, climate issues and environmental issues become increasingly prominent, the development and utilization of renewable energy plays an increasingly important role in the development of human society. Due to the advantages of renewable, abundant resources, environmental protection, high level of industrialization, and relatively low total cost, wind power has attracted more and more attention.

Wind power generation refers to a power generation method that uses wind power generation devices to absorb the kinetic energy of the wind, convert the kinetic energy of the wind into mechanical energy, and then convert the mechanical energy into electrical energy. In order to improve power generation efficiency, wind farms are generally built in places with abundant wind resources. outdoor.

Please refer to FIG. 1 , which is a schematic structural diagram of a typical wind power generating set in the prior art.

As shown in Fig. 1, the wind power generating set in the prior art comprises wind wheel 13, generator 12 and tower tube 11, and in the working process, wind acts on the blade 131 of wind wheel 13, produces aerodynamic torque, and the root of blade 131 The torque is transmitted to the hub and to the rotating shaft of the generator 12, which drives the rotating shaft of the generator 12 to rotate, and the generator 12 converts kinetic energy into electrical energy. The tower 11 is mainly used to support the wind rotor 13 of the wind power generating set and generate Machine 12.

In the prior art, there are mainly two types of wind turbines with torque transmission modes: traditional drive chain structure wind power generators and direct drive wind power generators.

The transmission chain of a wind turbine with a traditional transmission chain structure includes a main shaft and a speed-up box. The long main shaft is connected to the input shaft of the speed-up box. The output shaft of the speed-up box is connected to the shaft of the generator through a coupling. The torque of the wind wheel The torque is transmitted to the input shaft of the gearbox through the main shaft, and the torque after speed change is transmitted to the shaft of the generator through the coupling.

The length of the main shaft of the wind generator with the above structure is generally longer, and the main frame of the wind generator is larger, heavier and cumbersome. Therefore, it is very inconvenient to transport and hoist.

There is no gearbox between the wind rotor and the generator of the direct-drive wind turbine, and the wind rotor is directly connected to the input shaft of the generator, or connected to the input shaft of the generator through the main shaft. Due to the low speed of the wind rotor, Moreover, the speed increaser box is also canceled, so the rotational speed of the input shaft transmitted to the generator is low, and the volume and weight of the low-speed synchronous generator will be relatively large, which also causes inconvenience in transportation and installation.

With the increase in size of the wind power generating set, the control of the weight and volume of each component in the wind power generating set becomes more and more important.

Therefore, how to reduce the volume and weight of each part of the wind generator set on the basis of ensuring the power generation efficiency of the wind generator set, so as to facilitate transportation and hoisting, has become a current need for those skilled in the art. Solved technical problems.

Utility model content

The purpose of this utility model is to provide a wind power generating set, which has a more reasonable layout on the basis of ensuring power generation efficiency, thus has a compact structure and lighter weight, and improves the convenience of transportation and hoisting .

In order to solve the above-mentioned technical problems, the utility model provides a wind power generating set, which includes a wind wheel, a main shaft and a speed-up box, and the two ends of the main shaft are respectively connected with the wind wheel and the input shaft of the speed-up box, so that The main shaft is supported by a double-row tapered roller bearing, the number of the double-row tapered roller bearing is one, and the double-row tapered roller bearing is fixed in the bearing seat, and the bearing seat is installed on the wind turbine on the main rack.

Preferably, the length of the main shaft is in the range of 1.2m to 1.4m.

Preferably, the main shaft has a hollow structure.

Preferably, the speed-up gearbox is a two-stage transmission speed-up gearbox with a transmission ratio of 30 to 60.

Preferably, the two-stage transmission gearbox includes a compound planetary gear transmission pair and a parallel gear transmission pair.

Preferably, the speed increasing gearbox is supported on the main frame through a hydraulic shock absorbing device.

Preferably, the main shaft is bolt-connected to a connecting flange fitted on the input shaft of the gearbox, and an expansion sleeve is fitted on the outside of the fitting part of the connecting flange.

Preferably, the bearing outer ring of the double-row tapered roller bearing is connected to the bearing housing through bolts, and the bearing inner ring is interference fit with the main shaft.

Preferably, the generator of the wind power generator is connected to the output shaft of the gearbox through an elastic coupling, and the generator is a permanent magnet synchronous generator.

Preferably, the yaw reducer of the wind power generator is installed inside the main frame, and the yaw braking system of the yaw reducer is installed outside the main frame.

The wind power generating set provided by the utility model includes a wind wheel, a main shaft and a speed-up box. One end of the main shaft is connected to the wind wheel through a bolt and a connecting flange, and the other end is connected to the input shaft of the speed-up box. Roller bearing support, the number of double-row tapered roller bearing is one, the double-row tapered roller bearing is fixed in the bearing seat, and the bearing seat is installed on the main frame of the wind power generating set. Double-row tapered roller bearings can bear the axial and radial loads transmitted through the wind wheel at the same time, and can transmit the load to the main frame through the bearing seat, preventing loads other than torsional loads from being transmitted to the speed-up box, so that the speed-up The input bearing of the box is subject to additional bending moment, so only one double-row tapered roller bearing is needed to achieve the supporting purpose, which reduces the number of parts of the wind turbine, makes the structural layout in the nacelle more reasonable, and reduces the volume and size of the nacelle. weight; further, the bearing seat supporting the bearing is set up separately and installed on the main frame, so that the main shaft and the input shaft of the gearbox can be connected in a space other than the main frame, thereby greatly simplifying the structure of the main frame and reducing the weight of the main frame. The size of the main frame is reduced, the weight is reduced, and the structure of the wind turbine is more compact, which is convenient for transportation and hoisting.

In a preferred embodiment, the length of the main shaft of the wind power generating set provided by the present invention ranges from 1.2m to 1.4m. Because the wind power generating set provided by the utility model only needs one double-row tapered roller bearing, the length of the occupied main shaft is smaller, so that the main shaft is shorter than the main shaft of the wind power generating set in the prior art. Obvious shortening has been obtained, which further makes the structure of the wind power generating set more compact, and can be transported and hoisted more conveniently.

In another preferred embodiment, the speed-up box of the wind power generating set provided by the utility model is a two-stage transmission speed-up box with a transmission ratio of 30 to 60. In this way, the setting of the speed-up box enables the kinetic energy transmitted to the input shaft of the generator to have a higher rotational speed, thereby avoiding the excessive size of the generator while ensuring the power generation efficiency. At the same time, the speed-up box with a lower transmission ratio The high stability of the speed-up box can be ensured, the service life of the speed-up box is prolonged, and the cost of the wind power generating set is reduced.

Description of drawings

Fig. 1 is a schematic structural view of a typical wind power generating set in the prior art;

Fig. 2 is a structural schematic diagram of a specific embodiment of the wind power generating set provided by the utility model;

Fig. 3 is a structural schematic diagram of a specific embodiment of the main shaft drive part of the wind power generating set provided by the present invention;

Fig. 4 is a schematic top view of the main frame part of the wind power generating set shown in Fig. 2 .

Detailed ways

The core of the utility model is to provide a wind power generating set, which has a more reasonable layout on the basis of ensuring power generation efficiency, thus has a compact structure and lighter weight, and improves the convenience of transportation and hoisting .

In order to enable those skilled in the art to better understand the solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Fig. 2 and Fig. 3, Fig. 2 is a structural schematic diagram of a specific embodiment of the wind power generating set provided by the utility model; Fig. 3 is a specific embodiment of the main shaft transmission part of the wind power generating set provided by the utility model Schematic diagram of the structure.

In a specific embodiment, as shown in the figure, the wind power generating set provided by the utility model includes a wind wheel 21, a main shaft 22, a gearbox 25, a shaft coupling 27 and a generator 28, and one end of the main shaft 22 Connect with the wind wheel 21 through bolts and the connecting flange integrated with the main shaft 22, and the other end is connected with the input shaft 251 of the speed-up box 25, and the output shaft (not shown) of the speed-up box 25 is connected with the shaft coupling 27. The input shaft of the generator 28 is connected; the main shaft 22 is supported by a double-row tapered roller bearing 29, and the number of the double-row tapered roller bearing 29 is one, and the double-row tapered roller bearing 29 is fixed in the bearing seat 23, and the bearing seat 23 Installed on the main frame 24 of the wind power generating set.

Specifically, the bearing outer ring 291 of the double-row tapered roller bearing 29 can be fixedly connected to the bearing seat 23 by means of bolt connection, and the bearing inner ring 293 is set on the outside of the main shaft 22 through interference fit, and the bearing outer ring 291 and the bearing Two rows of oppositely arranged tapered rollers 292 are arranged between the inner rings 293 .

During the working process, the blades (not shown in the figure) of the wind power generating set absorb wind energy and convert it into mechanical energy. After the gearbox 25 speeds up, the output is output through its output shaft, and transmitted to the rotating shaft of the generator 28 through the coupling 27. The generator 28 uses the transmitted torque to generate electricity, and supplies power to the grid after being connected to the grid.

In the process of energy transmission, in addition to transmitting the torque required for power generation to the generator 28, other loads may also be transmitted to the generator 28. In order to avoid the occurrence of the above situation, two bearings are generally arranged on the main shaft of the prior art. bear axial and radial loads respectively, and then transmit the loads to the main frame 24; and the wind power generator set provided by the utility model adopts double-row tapered rollers that can simultaneously bear the axial and radial loads transmitted through the wind wheel The bearing 29 can not only transmit the load to the main frame 24 through the bearing seat, prevent loads other than the torsional load from being transmitted to the speed-up box, so that the input bearing of the speed-up box is subject to additional bending moment, and reduce the number of bearings, only need One bearing can achieve the purpose of supporting, reducing the number of parts of the wind power generating set, making the structural layout in the nacelle more reasonable, reducing the volume and weight of the nacelle; further, the bearing seat 23 supporting the bearing is set up separately and installed on On the main frame 24, the input shaft 251 of the main shaft 22 and the step-up box 25 can be connected in a space outside the main frame 24, thereby greatly simplifying the structure of the main frame 24, reducing the size of the main frame 24, and reducing the weight , making the structure of the wind turbine more compact and convenient for transportation and hoisting.

Specifically, the length range of the main shaft of the wind power generating set provided by the present invention can be 1.2m to 1.4m.

Like this, the wind power generating set provided by the utility model, owing to only needing a double-row tapered roller bearing 29, the length of the occupied main shaft 22 is less, thereby makes the main shaft 22 and the main shaft of the wind power generating set in the prior art be comparable. Compared with that, its length has been significantly shortened, which further makes the structure of the wind turbine more compact, and can be transported and hoisted more conveniently.

Of course, the weight of the main shaft 22 can also be reduced in other ways, for example: the main shaft 22 has a hollow structure.

In the prior art, the main shaft 22 of the wind power generator only has a mounting hole for installing cables in its center, and the size of the mounting hole is greatly limited due to the influence of rigidity and strength, which also causes the weight of the main shaft to be relatively large. , it is inconvenient to transport and install, but the axial dimension of the main shaft 22 of the wind power generator provided by the utility model is small, it can be processed into a hollow structure, and the rigidity and strength requirements are relatively easy to meet, so that the rigidity and strength requirements can be met On the basis of this, the weight is further reduced, and the convenience of installation and transportation is improved.

In another specific embodiment, the speed-up box 25 of the wind power generating set provided by the utility model can be a two-stage transmission speed-up box, and the achieved transmission ratio can generally be 30 to 60. In this way, on the one hand, the setting of the speed increasing box 25 makes the kinetic energy transmitted to the input shaft of the generator 28 have a higher rotational speed, so that under the condition of ensuring the power generation efficiency, the excessive size of the generator can be avoided; on the other hand, The speed-up box 28 with a lower transmission ratio also has higher stability, thereby having a longer service life and reducing the cost of the wind power generating set.

Specifically, the above-mentioned two-stage transmission gearbox may include a compound planetary gear transmission pair and a parallel gear transmission pair. Through the transmission and acceleration of the compound planetary gear transmission pair and the parallel gear transmission pair, the speed that meets the power generation needs is reached.

Since the compound planetary gear transmission pair generally includes an outer ring gear, a planetary carrier, a planetary gear and a sun gear; the specific transmission process can be as follows: the main shaft transmits kinetic energy to the planetary carrier, and the planetary carrier drives the planetary gears to rotate. The outer ring gear meshes with the sun gear, and the outer ring gear is in a fixed state, so that the planetary gear needs to perform revolution and rotation around the sun gear at the same time, so as to transmit the motion to the sun gear, and the drive shaft of the sun gear transmits the motion to The driving wheel of the parallel gear transmission pair is finally transmitted to the coupling 27 and the generator 28 through the driven wheel of the parallel gear transmission pair after another transmission and speed increase; of course, the transmission process can also be in other ways, here No longer.

Further, the above-mentioned two-stage transmission gearbox can also have other structures, such as a compound planetary gear transmission pair or a parallel gear transmission pair for both stages. However, if both stages are compound planetary gear transmission pairs, the structure is complicated and the parts If the two stages are parallel gear transmission pairs, the eccentricity will be more serious, which will affect the service life of each part of the gearbox.

In order to reduce the vibration effect on the speed-up box 25 and reduce the noise, the speed-up box 25 can be supported on the main frame 24 through a hydraulic damping device 26 . Specifically, two mounting ears may be provided on the housing of the speed-up gearbox 25 , and then the mounting ears are seated on the hydraulic shock absorbing device 26 , and then installed on the main frame 24 through the hydraulic shock absorbing device 26 . Of course, the speed-up box 25 can also be installed on the main frame in other ways, for example: through a round rod type shock-absorbing support method or a flange rigid connection method.

In a specific embodiment, as shown in FIG. 2 , in order to facilitate power transmission, the input shaft 251 of the speed-up box 25 of the wind power generating set provided by the utility model can be fitted with a connecting flange 32 and integrated with the main shaft 22. The flange and the above-mentioned connecting flange 32 are connected by bolts, and the outer side of the fitting part of the connecting flange 32 is fitted with an expansion sleeve 31 , and the kinetic energy is transmitted to the gearbox 25 through the expansion sleeve 31 .

The expansion sleeve 31 includes a first part 311 and a second part 312 that cooperate with each other and are connected by bolts. The first part 311 is directly set on the fitting part of the connecting flange 32, and the second part 312 is set on the outside of the first part 311. The contact surface is a tapered surface. When the connecting flange 32 is required to hold the input shaft 251 of the speed-increasing box tightly, the bolts of the expansion sleeve 31 are tightened to reach the predetermined bolt pre-tightening force, so that the first part 311 of the expansion sleeve 31 is relatively The second part 312 moves to the thicker part, so that the radial force of the expansion sleeve 31 makes the connecting flange 32 hug the input shaft 251 of the speed-up box, so as to realize the smooth transmission of the wind wheel torque.

Of course, the main shaft 22 and the input shaft 251 of the gearbox 25 can also be connected by other connection methods, such as: flange connection or spline connection.

In another specific embodiment, the generator 28 of the wind power generator can be connected with the output shaft of the gearbox 25 through an elastic coupling, so that the connection between the input shaft of the generator 28 and the output shaft of the gearbox 25 can be improved. Stress condition, prolong service life.

Since the permanent magnet synchronous generator has the characteristics of high power generation efficiency and the quality of the generated energy is good, therefore, the generator 28 of the wind power generating set provided by the utility model can be a permanent magnet synchronous generator.

Please refer to FIG. 4 . FIG. 4 is a schematic top view of the main frame part of the wind power generating set shown in FIG. 2 .

Specifically, the yaw reducer 33 of the wind power generator can be installed in the main frame 24, and the yaw braking system of the yaw reducer 33 can be installed on the outside of the main frame 24 to facilitate installation and maintenance; further, for To facilitate the installation of the yaw braking system, a yaw braking system mounting plate 34 is provided on the main frame 24 .

The wind power generating set provided by the utility model has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present utility model, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall into the protection of the claims of the utility model. within range.

Claims (10)

1. wind power generating set, comprise wind wheel (21), main shaft (22) and speedup box (25), the two ends of described main shaft (22) are connected with the input shaft (251) of described wind wheel (21) and described speedup box (25) respectively, it is characterized in that, described main shaft (22) supports by double-row conical bearing (29), the number of described double-row conical bearing (29) is one, described double-row conical bearing (29) is fixed in the bearing support (23), and described bearing support (23) is installed on the mainframe (24) of described wind power generating set.

2. wind power generating set according to claim 1 is characterized in that, the length range of described main shaft (22) is 1.2m to 1.4m.

3. wind power generating set according to claim 2 is characterized in that, described main shaft (22) has hollow-core construction.

4. according to each described wind power generating set of claim 1 to 3, it is characterized in that described speedup box (25) is a two-stage transmission speedup box, velocity ratio is 30 to 60.

5. wind power generating set according to claim 4 is characterized in that, described two-stage transmission speedup box comprises dual planetary gear transmission and parallel gear driving pair.

6. wind power generating set according to claim 4 is characterized in that, described speedup box (25) is supported in described mainframe (24) by hydraulic damping device (26).

7. according to each described wind power generating set of claim 1 to 3, it is characterized in that, described main shaft (22) is connected with adpting flange (32) bolt of the input shaft that is set in described speedup box (25) (251), and the outside of the suit portion of described adpting flange (32) is set with swelling cover (31).

8. according to each described wind power generating set of claim 1 to 3, it is characterized in that, the bearing outer ring (291) of described double-row conical bearing (29) is connected by bolt with described bearing support (23), its bearing inner race (292) and described main shaft (22) interference fit.

9. according to each described wind power generating set of claim 1 to 3, it is characterized in that the generator of described wind-driven generator (28) is connected by the output shaft of elastic coupling flexible coupling with described speedup box (25), described generator (28) is a magneto alternator.

10. according to each described wind power generating set of claim 1 to 3, it is characterized in that, the yawing reducer of described wind-driven generator (33) is installed in the described mainframe (24), and the driftage brake system of described yawing reducer (33) is installed on the outside of described mainframe (24).

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