KR20120051890A - Drive train for wind turbine - Google Patents

Abstract

PURPOSE: A drive train for a wind power generator is provided to improve coupling force of a tower and an extended part by forming the extended part in a shape of a nozzle with an increased outer diameter. CONSTITUTION: A drive train for a wind power generator comprises a supporting shaft(100), a rotor shaft(200), and a bearing(300). The supporting shaft is fixed to a tower. The rotor shaft is connected to a rotor hub. The bearing supports the rotor shaft with respect to the supporting shaft rotatably. The supporting shaft comprises a connection unit(110) and a extended part(120). An outer circumference of the connection unit is contacted with an inner circumference of the bearing. The extended part is extended in a shape of a nozzle. An outer diameter of an end portion of the extended part is increased compare to the outer diameter of the connection unit. The end tip of the extended part is fixed to the tower.

Description

Drive train for wind turbines

The present invention relates to a drive train for a wind power generator, and more particularly, a high capacity bulky power generation device can be easily mounted, and the coupling force with the tower can be improved, and the braking device can be installed compactly. In addition, the present invention relates to a drive train for a wind turbine having a structure that can provide an installation space so that the locking device can be compactly installed.

In recent years, the international community is strengthening environmental regulations as weather extremes continue, and stressing the importance of alternative energy development by predicting the limits of fossil energy resources. Among these alternative energy sources, the wind power generation industry using wind power has grown at a high rate of 20.5% in the world for the past five years. In order to cope with the fact that 97% of domestic energy is relied on imports, it is spurring the development of wind power technology and system distribution.

In such a wind power generation industry, the performance and durability of the wind power generator that converts wind energy into electrical energy is very important. In such a wind turbine, there are a direct drive type in which the rotational force of the rotor hub is directly transmitted to the power generator and an indirect drive type in which a gear device is applied to the rotational force transmission.

Among them, a wind power generator having a single bearing of a direct drive type generally includes a rotor hub 10 having a plurality of blades 11 and a rotational force of the rotor hub 10, as shown in FIG. 1. Drive train 20 to be transmitted to the power generator, the generator 30 is composed of a rotor (rotor, 31) and a stator (stator, 32) for converting rotational energy into electrical energy, other components on the ground It is composed of a tower 40 for supporting the lock, a locking device 50 for locking the rotor hub 10 so as not to rotate when the wind turbine is stopped, a control system (not shown), and the like.

Here, the drive train 20 is coupled to the support shaft 21 and the rotor hub 10 fixed to the tower 40, the rotor shaft 22, the support shaft (22) is installed in a form surrounding the support shaft 21 ( A bearing 23 for rotatably supporting the rotor shaft 22 with respect to 21 and a braking device (not shown) for braking the rotation of the rotor shaft 22.

And the generator 30 is the rotor 31 is fixed to the rotor shaft 22 through the connecting member 22-1, the stator 32 is fixed to the tower 40 through the support member 41 And the rotor 31 rotates relative to the stator 32 as the rotor shaft 21 rotates with respect to the support shaft 21 to produce electricity.

Since the drive train 20 of the conventional wind turbine is limited in width of the support shaft 21 to correspond to the width of the bearing 23, the size and weight of the components of the wind turbine installed in the tower 40 can be reduced. There are advantages to it.

However, since the rotor 31 and the stator 32 have a large capacity generator 30 having a large capacity due to a demand for increased capacity of the generator 30 according to the recent trend of larger wind turbines, the width of the support shaft 21 is thus wide. The conventional drive train 20, in which the width of the generator 30 is also limited by the limitation, is not suitable.

In addition, the conventional drive train 20 has a bearing 23 is installed in a form surrounding the entire outer peripheral portion of the support shaft 21 is provided in a tube shape having a circular cross section, the support shaft 21 to the tower 40 Bolting PCD (Pitch Circle Diameter) for fixing is limited to less than the inner diameter of the bearing 23, there is a problem that the connection portion of the support shaft 21 and the tower 40 is insufficient to withstand heavy moments in accordance with the trend of larger size.

In addition, since the space for properly installing the lock device 50 is not provided in the space where the conventional drive train 20 exists, the lock device 50 is the drive train 20 as shown in FIGS. 1 and 2. The locking hole is provided in the form protruding toward the tower 40 side and the locking pin of the locking device 50 is inserted into the connection member 22-1, which is a separate member, there is a disadvantage Similar occurrences occur for non-braking devices.

In order to solve the problems described above, the present invention is not limited to the width of the power generator mounted according to the size and shape of the specific component, it is possible to easily increase the bolting PCD of the portion to be combined with the tower as necessary. To provide a drive train for a wind turbine, the braking device can be installed compactly, and the lock device can be installed compactly, so that the space can be provided.

In order to solve the above problems, the drive train for a wind turbine generator according to the present invention is provided with a wind turbine of the direct drive type, a support shaft fixed to the tower, a rotor shaft coupled to the rotor hub, and the rotor In a drive train for transmitting the rotational force of the rotor hub to the power generator, including a bearing rotatably supporting the shaft relative to the support shaft, the support shaft is provided in a tube shape of a circular cross section, the outer peripheral surface is A fastening part provided in contact with the inner circumferential surface of the bearing; And an extension part formed at one end of the fastening part to extend in a nozzle shape whose outer diameter increases, and an end part having an increased outer diameter compared to the outer diameter of the fastening part fixedly installed at the tower.

The rotor shaft may include a flange for supporting the rotor of the power generator in such a manner as to extend from the outer side of the fastening portion to the outer side of the extension portion in a radial direction at an end portion of the extension side of the support shaft. It may be provided.

The flange may include a plurality of locking holes or a plurality of locking grooves formed to insert locking pins of a locking device for fixing or releasing the rotor shaft with respect to the support shaft.

The extension portion is provided on the outer peripheral surface of the mounting portion is fixed to the locking device provided with a locking pin to be selectively inserted into a plurality of locking holes or a plurality of locking grooves formed in the flange to secure or release the rotor shaft relative to the support shaft. It may be provided.

The wind turbine drive train may include a brake disc fixed to a receiving groove formed at the rotor hub side end of the rotor shaft, and an inner ring fixing member fastened to the rotor hub side end of the fastening part to secure an inner ring of the bearing. And a braking device formed of a braking caliper for selectively pressing the surface of the braking disk to generate a friction braking force.

According to the drive train for a wind turbine of the present invention, since the rotor and the stator of the generator having various widths can be arranged by extending the extension as necessary for the support shaft, a high capacity generator according to the trend of larger wind turbines It can be easily mounted.

And by forming the extension portion in the shape of a nozzle to increase the outer diameter can be improved as much as necessary the outer diameter of the end coupled to the tower, it is possible to improve the coupling force with the tower by improving the bolting PCD of the end coupled to the tower. Accordingly, high support stability can be provided even if a high capacity, heavy weight generator and bearing are mounted.

In addition, the locking hole or the locking groove is formed in the flange provided on the rotor shaft, and the locking device can be installed on the mounting table provided on the outer periphery of the extension, thereby providing a space in which the locking device can be installed in the space where the drive train exists. Therefore, the locking device can be compactly installed in the space where the drive train is installed.

In addition, the braking device may be compactly provided in the form in which the brake disc is fixed to the receiving groove of the rotor shaft and the brake caliper is installed on the inner ring fixing member of the fastening portion.

1 is a side cross-sectional view schematically showing a direct-driven wind turbine with a drive train for a conventional wind turbine;
FIG. 2 is an enlarged view of part A shown in FIG. 1;
3 is a perspective view showing a drive train for a wind turbine generator in accordance with a preferred embodiment of the present invention in a state in which the generator, the lock and the housing are partially cut away;
Figure 4 is a rear perspective view showing a drive train for a wind turbine generator in accordance with a preferred embodiment of the present invention, the generator, the locking device and the housing in a partially cut state;
Figure 5 is a side cross-sectional view schematically showing a direct drive wind turbine with a drive train for a wind turbine in accordance with a preferred embodiment of the present invention,
FIG. 6 is an enlarged view of a portion B shown in FIG. 3.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains (hereinafter, referred to as a person skilled in the art) may easily perform the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As shown in FIGS. 1 and 2, the drive train for a wind turbine according to the present invention receives the rotational force of the rotor hub 10 and the rotor hub 10 provided with a plurality of blades 11 directly to receive the electric power. Direct drive type wind power consisting of a generator 30 consisting of a rotor (31), which is a rotor for converting energy, and a stator (32), a tower (40) for supporting other components to the ground, and a control system. It is provided in the generator to directly transfer the rotational force of the rotor hub 10 to the power generation device 30, it is easy to mount a high capacity bulky power generation device 30, also very strong coupling force with the tower 40 It is strong and the drive train for a wind turbine having a structure that can provide a space in which a locking device for locking the rotor hub 10 is not rotated or a braking device for applying a braking force to the rotation of the rotor hub 10 can be compactly installed. tube Will.

Hereinafter, with reference to the accompanying Figures 3 to 6, it will be described in detail the configuration and effect of the drive train for the wind turbine generator (hereinafter referred to as "drive train" for short) in accordance with a preferred embodiment of the present invention.

The drive train according to the preferred embodiment of the present invention includes a support shaft 100, a rotor shaft 200, a bearing 300, and a braking device 400.

The support shaft 100 is a component fixed to the tower 40, and serves to rotatably support the rotor shaft 200. To this end, the support shaft 100 comprises a fastening portion 110 and the extension portion 120.

The fastening part 110 is provided in a tube shape having a circular cross section, and an outer circumferential surface thereof is in contact with an inner circumferential surface of a bearing 300 that is a component that allows the rotor shaft 200 to rotate relative to the support shaft 100. It is coupled with the inner ring of the bearing (300).

The inner end of the rotor hub 10 side of the fastening part 110 is provided with an inner ring fixing member 111 for pressing and fixing the inner ring of the bearing 300, so that the fastening part 110 is firmly connected to the inner ring of the bearing 300. Combined.

The extension part 120 is formed to extend in the shape of a nozzle in which the outer diameter thereof is increased at one end of the fastening part 110, the end portion having an increased outer diameter compared to the outer diameter of the fastening part 110 of the tower 40 It is fixedly installed on the support frame 41.

Accordingly, the inner and outer circumferential surfaces of the extension part 120 are formed to be inclined with respect to the axial direction of the support shaft 100, and the extension part 120 may be installed in the outer space generated thereby. The mounting table 122 is provided on the outer circumferential surface thereof.

In a preferred embodiment of the present invention, the mounting table 122 is implemented in the form of a rib integrally formed in the extension portion 120, the mounting table 122 may be implemented in various forms without being limited thereto. .

And since the end portion 120 is fixed to the tower 40 has an increased outer diameter compared to the outer diameter of the fastening portion 110, fastening member (not shown) is installed to secure to the tower 40 The PCD of the hole 121 can be sufficiently raised. Accordingly, the bonding strength of the support shaft 100 and the tower 40 can be improved, and even if a large moment due to the heavy material is applied to the support shaft 100, it can withstand this sufficiently.

The rotor shaft 200 is provided in a tube shape of a circular cross section so as to surround the outer ring of the bearing 300 is installed on the outer peripheral surface of the fastening portion 110 of the support shaft 100, one end of the plurality of blades (11) ) Is coupled to the rotor hub 10 provided, and the flange 210 is radially formed at the other end thereof, that is, the end of the extension part 120 side, as shown in FIGS. 4 and 6.

The flange 210 is a rotor 31 of the power generation device 30 disposed on the outside of the extension portion 120 from the outside of the fastening portion 110 in the axial direction of the support shaft 100 and the rotor shaft 200. ) To transfer the rotational force of the rotor shaft 200 to the rotor 31.

The stator 32 having a width corresponding to the rotor 31 of the power generator 30 is installed on the inner circumferential surface of the housing 60 to surround and protect the drive train. Thus, the extension part provided in the support shaft 100 is provided. The high capacity generator 30 having a large rotor 31 and stator 32 by 120 can also be easily mounted in the drive train according to the present invention.

In addition, a plurality of locking grooves 211 or a plurality of locking holes are formed in the flange 210 along the center thereof, and the locking pins of the locking device 50 are provided in the plurality of locking grooves 211 or the plurality of locking holes. The 51 is selectively inserted or separated to serve to selectively block rotation of the rotor shaft 200 with respect to the support shaft 100.

On the other hand, the rotor shaft 200 is the outer ring fixing member 230 provided at the end of the extension portion 120 side by pressing the outer ring of the bearing 300, the rotor shaft 200 is the outer ring of the bearing 300 And with respect to the support shaft 100.

The bearing 300 serves to rotatably support the rotor shaft 200 with respect to the fastening portion 110 of the support shaft 100, for this purpose, the inner ring is supported by the inner ring fixing member 111 The fastening part 110 of the fastening part 110 is fixed to the outer peripheral surface, the outer ring is fixed to the inner peripheral surface of the rotor shaft 200 by the outer ring fixing member 230.

The braking device 400 serves to slow down the rotational speed of the rotor shaft 200 which rotates with respect to the support shaft 100 or to stop the rotor shaft 200. To this end, the braking device 400 includes a braking disc 410 and a braking caliper 420.

3 and 6, the brake disc 410 is installed in the receiving groove 220 formed at the end of the rotor hub 10 side of the rotor shaft 200, and the brake caliper 420 is It is installed on the inner ring fixing member 111 that is fastened to the end of the rotor hub 10 side of the fastening portion 110 to surround both sides of the brake disk 410.

The brake caliper 420 generates a friction braking force by selectively pressing the surface of the brake disc 410. As such, the braking device 400 may be compactly installed on the rotor shaft 200 and the inner ring fixing member 111.

The drive train according to the preferred embodiment of the present invention may be implemented to be securely protected by a housing cover 61 of which one side is opened and a housing cover 61 which covers and closes an open side of the housing 60.

Hereinafter, the operation and use state of the drive train according to the preferred embodiment of the present invention will be described in detail.

First, when the wind turbine is operated to produce power, when the wind is converted into rotational force by the plurality of blades 11 to rotate the rotor hub 10, the rotor shaft 200 coupled to the rotor hub 10 Is rotated, the outer ring of the bearing 300 fixed to the rotor shaft 200 by the outer ring fixing member 230 is rotated together.

At this time, the rotor shaft 200 is supported by the fastening portion 110 of the support shaft 100 coupled to the inner ring of the bearing 300 by the inner ring fixing member 111, the flange formed on the rotor shaft 200 ( The rotor 31 of the power generation device 30 installed in 210 generates power by interacting with the stator 32 installed in the housing 60.

Since the width of the power generation device 30 is not limited by the width of the bearing 300 by the extension part 120 provided on the support shaft 100, it is easy to mount even if one having a large width of a high capacity is provided. It is possible.

Next, when the wind turbine is stopped, the brake caliper 420 installed on the inner ring fixing member 111 of the fastening portion 110 of the support shaft 100 is fixed to the receiving groove 220 of the rotor shaft 200. The rotation of the rotor shaft 200 relative to the support shaft 100 is reduced and stopped by pressing the surface of the brake disk 410 to generate a friction braking force. Accordingly, the rotation of the rotor hub 10 and the plurality of blades 11 coupled with the rotor shaft 200 is also decelerated and stopped.

Thereafter, the locking device 50 installed on the mounting table 122 on the outer circumferential surface of the extension 120 of the support shaft 100 is locked in order to prevent the rotor hub 10 and the plurality of blades 11 from unexpectedly rotating. By moving the pin 51 toward the rotor shaft 200, the locking pin 51 is inserted into the locking groove 211 or the locking hole of the flange 210 formed in the rotor shaft 200, thereby providing the rotor shaft 200. It is physically locked so as not to rotate on the support shaft 100.

Thereafter, in order to restart the wind power generator, the locking device 50 transfers the locking pin 51 to the extension part 120 to release the lock from the locking groove 211 or the locking hole to release the lock, and the brake disc 410. When the pressurization of the brake caliper 420 against the surface of) is also released, the plurality of blades 11 and the rotor hub 10 are rotated by the wind.

As described above, according to the drive train for a wind turbine generator according to the present invention, by extending the extension portion 120 to the support shaft 100 as necessary, the width of the generator 30 is not limited, so the trend of larger wind turbines The high capacity bulky power generation device can be easily mounted, and by forming the extension portion in the shape of a nozzle to increase the outer diameter, the bolting PCD can be improved to improve the coupling force with the tower, and the flange provided on the rotor shaft The locking device can be installed on the mounting table provided on the outer periphery of the extension by forming the locking hole or the locking groove, and provide the installation space for the locking device to be compactly installed in the drive train. It is fixed to the receiving groove and the brake caliper is installed on the inner ring fixing member of the fastening part. It may be provided with the agent.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and variations belong to the appended claims. will be.

Description of the Related Art [0002]
100: support shaft 110: fastening portion
111: inner ring fixing member 120: extension part
121: fastening hole 122: mounting table
200: rotor shaft 210: flange
211: locking groove 220: receiving groove
230: outer ring fixing member 300: bearing
400: braking device 410: braking disc
420: braking caliper 10: rotor hub
11: blade 30: power generation device
31: rotor 32: stator
40: tower 41: support frame
50: locking device 51: locking pin
60: housing 61: housing cover

Claims (5)

Rotational force of the rotor hub is provided in the wind turbine of the direct drive type, including a support shaft fixed to the tower, a rotor shaft coupled to the rotor hub, and a bearing rotatably supporting the rotor shaft relative to the support shaft In the drive train for delivering the power to the generator,
The support shaft,
A fastening part provided in a tube shape having a circular cross section and having an outer circumferential surface in contact with an inner circumferential surface of the bearing; And
An extension part formed at one end of the fastening part so as to extend in a nozzle shape whose outer diameter is increased, and an end part having an increased outer diameter relative to the outer diameter of the fastening part is fixed to the tower;
Drive train for wind turbines, characterized in that comprises a. The method of claim 1,
The rotor shaft is,
A wind turbine characterized by extending radially at the end portion of the extension side of the support shaft, the flange supporting the rotor of the power generating device so as to extend from the outer side of the fastening portion to the outer side of the extension portion along the axial direction thereof. Drive train for generator. The method of claim 2,
The flange
A plurality of locking holes or a plurality of locking grooves formed to insert locking pins of the locking device to fix or release the rotor shaft with respect to the support shaft;
Drive train for a wind turbine comprising a. The method of claim 2,
The extension portion,
The outer circumferential surface of the mounting surface is fixed to a plurality of lock holes formed in the flange or a plurality of locking grooves is fixed to the locking device having a locking pin for fixing or releasing the rotor shaft relative to the support shaft. Drive train for wind turbines. 5. The method according to any one of claims 1 to 4,
A brake disc fixed to a receiving groove formed at the rotor hub side end of the rotor shaft, and
A braking device formed on an inner ring fixing member fastened to the rotor hub side end of the fastening portion to fix an inner ring of the bearing, the braking caliper being configured to selectively pressurize the surface of the brake disc to generate a friction braking force;
Drive train for a wind turbine further comprising a.

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