TW201727054A - Wind power generation system - Google Patents

Abstract

The purpose of the present invention is to provide a wind power generation system capable of dealing with leakage of grease or oil. In order to address the above problem, the wind power generation system is characterized by being provided with: a blade 1 that rotates when acted on by wind; a hub 2 that supports the blade 1; a bearing 3 that supports a load of the hub 2; a grease storage space 9 that is in contact with the bearing 3 and stores grease or oil; a grease reservoir 10 that communicates with the grease storage space 9; and a transporting means 12 for transporting grease or the oil that has accumulated in the grease reservoir 10 into the grease storage space 9.

Description

Wind power system

The present invention relates to a wind power generation system, and more particularly to responding to leakage of grease or oil to bearings adjacent to the main shaft.

Wind power generation systems, which are the mainstay of renewable energy, are being introduced extensively. In the wind power generation system, the rotation power is transmitted to the main shaft through the rotation of the hub formed by the blades, and the generator is rotated to perform the power generation operation. A bearing is provided on the main shaft to support the rotational movement of the main shaft. In order to support the main shaft with a rotating load, the bearing is often used with a rolling bearing, and the lubricating oil of the bearing is fully sealed with grease or oil. Therefore, it is necessary to provide a sealing structure to prevent leakage of grease or oil enclosed in the bearing and to prevent foreign matter from intruding from the outside. As a method of preventing leakage of grease or oil for bearing lubrication, there are generally a sealing mechanism such as a labyrinth structure or an oil seal, and a method of performing them separately or in combination.

Here, the lubrication mechanism of the bearing in the wind turbine generator is described in Patent Document 1. Patent Document 1 describes The lubricating mechanism of the sliding bearing is designed such that the inner ring has an oil supply groove at a central portion of the inner diameter surface thereof, and an oil supply hole that communicates with the oil supply groove and penetrates the inner ring in the radial direction, and passes through the oil supply groove from the oil supply groove. The lubricating oil is supplied to the oil hole to the sliding surface of the bearing gasket for sliding the outer ring.

Prior technical literature Patent literature

Patent Document 1: International Publication No. 2013-191163

Wind power generation system, in the power generation operation, the blade or the hub may also bear the force outside the rotating surface, and such inclination is also transmitted to the main shaft or a drive train called a speed increaser. In this case, grease or oil leaks from the specified grease storage space. Here, in Patent Document 1, regarding the oil supply of the lubricating oil, the response to the grease or oil leaking from the grease storage space is not mentioned.

Accordingly, the present invention is directed to providing a wind power generation system that can cope with leakage of grease or oil.

In order to solve the above problems, the wind power generation system of the present invention is characterized in that: a blade is provided to be rotated by the wind; and a hub supports the blade; and a bearing supports the load of the hub; and the grease is emptied And connecting the bearing and accommodating the grease or the oil; and the grease retention portion to communicate with the grease storage space; and the conveying means for conveying the grease or oil retained in the grease retention portion to the lubrication Grease storage space.

According to the present invention, it is possible to provide a wind power generation system that can cope with leakage of grease or oil.

1‧‧‧ leaves

2‧‧·wheels

3‧‧‧ Bearing

4‧‧‧ Spindle

5‧‧‧Speed increaser

6‧‧‧ bearing box

7‧‧‧ bearing retainer

8‧‧‧ Sealing mechanism

9‧‧‧Grease storage space

10‧‧‧ Grease retention

11‧‧‧ gap

12‧‧‧Grease extrusion mechanism

13‧‧‧The flow of grease or oil

14‧‧‧Rotation direction

15‧‧‧Guiding members (opposing parts)

16‧‧‧ inclined section

17‧‧‧ Fixed spindle

18‧‧‧Guiding members (wall face)

19‧‧‧Cabinet

20‧‧‧Tower

21‧‧‧through holes

22‧‧‧Frame

23‧‧‧ openings

[Fig. 1] A schematic overall view of the appearance of a wind power generation system.

2 is a schematic view showing a connection relationship between a hub and a main shaft in the wind power generation system of the first embodiment.

Fig. 3 is a schematic view showing the configuration of a bearing periphery in the wind power generation system of the first embodiment.

Fig. 4 is a schematic view showing the periphery of a bearing and a method of conveying grease and oil in the wind power generation system of the first embodiment.

Fig. 5 is a schematic view showing the periphery of a bearing and a method of conveying grease and oil in the wind power generation system of the first embodiment.

Fig. 6 is a schematic view showing a grease extruding mechanism for conveying grease and oil in the wind power generation system of the first embodiment.

Fig. 7 is a schematic view showing a connection relationship between a hub and a main shaft in the wind power generation system of the second embodiment.

Hereinafter, a suitable embodiment for carrying out the above-described present invention will be described with reference to Figs. 1 to 7 . The following are only examples, and the gist of the invention is not intended to be construed as limiting the particular aspects.

Example 1

Embodiment 1 will be described using Figs. 1 to 6 . As shown in FIG. 1, the wind power generation system is generally composed of a blade 1 that is rotated by the wind, a hub 2 that is fastened and supported by the blade 1, a nacelle that rotatably supports the hub 2, and a support cabin. A load tower 20 of 19 is constructed. The nacelle 19 is rotatably supported in a horizontal plane with respect to the tower 20, and is rotationally driven in response to the wind direction. According to this configuration, the orientation of the nacelle 19 can be changed in response to the wind direction, and the blade 1 can efficiently receive the wind.

Fig. 2 is a view for explaining a connection mechanism between the hub 2 and the main shaft 4, and corresponds to a portion surrounded by a broken line in Fig. 1. As shown in the figure, the wind power generation system of the present embodiment has: a blade 1; and a hub 2 supporting the blade 1 and being subjected to wind to rotate together with the blade 1; and a main shaft 4 connected to the hub 2 with the hub The rotation of 2 rotates; and the speed increaser 5 is connected to the main shaft 4 to increase the rotational speed. The main shaft 4 is rotatably supported by the bearing 3. The bearing 3 supports the load of the hub 2. In the speed increaser 5, although not shown, a generator is connected, and the rotor of the generator is driven by the rotational power that increases the rotational speed by the speed increaser 5. Electrical operation.

3 to 5 are views for explaining the configuration of the periphery of the bearing 3. Figure 3 is a detailed view of the bearing 3 surrounded by the dashed line of Figure 2. Fig. 4 is a view as seen from a section of A-A of Fig. 3. Moreover, the figure at the time of the cross section of B-B of FIG. 4 is FIG. Fig. 5 is a view showing the structure around the periphery of the bearing 3 as seen from the cross section taken along the line C-C of Fig. 4 . The bearing 3 is slightly symmetrical with respect to the main shaft, and is also disposed in the same manner for the opposite side. The main shaft 4 that is rotated by the wind is rotatably supported by one or a plurality of bearings 3. The bearing 3 is housed in the bearing housing 6, and is fixed by the bearing retainer 7 so as not to be displaced in the axial direction of the main shaft 4 (the horizontal direction in Fig. 3). With this configuration, even if the spindle 4 rotates, the shaft does not slosh and can be smoothly rotated.

A sealing mechanism 8 such as an oil seal is provided in the bearing retainer 7 to prevent leakage of grease or oil. Specifically, it is configured to cover the gap 11 described below. In order to supply the grease or oil to the bearing 3, a grease accommodating space 9 is provided which is in contact with the bearing 3 and houses grease or oil. Grease or oil is provided to suppress friction between the main shaft 4 and the bearing 3. Along with this, a smooth rotation of the spindle 4 can be achieved. The grease retention portion 10 is provided in the bearing retainer 7 and is connected to the grease storage space 9 through the gap 11 also provided in the bearing retainer 7. The gap 11 is also provided on the opposite side of the grease storage space 9 with respect to the grease retention portion 10. In order to prevent the grease from leaking from the gap 11 which is also provided on the side opposite to the grease receiving space 9, the sealing mechanism 8 is provided.

Further, the grease retention portion 10 has a space extending toward the inner diameter side and the outer diameter side with respect to the gap 11, so as not to be the gap 11 The grease which gradually intrudes into the grease retention portion 10 from the side close to the grease storage space 9 directly leaks to the outside of the bearing housing 6.

Lubricating grease or oil is sealed around the bearing 3, but grease or oil is not sealed at the beginning of the grease retention portion 10. Here, the windmill rotor is subjected to wind and rotates during power generation operation. However, due to wind fluctuation or azimuth, the blades receive different forces, and therefore they are inclined outside the rotating surface. This inclination is also transmitted to the main shaft connected to the wind turbine rotor. The force applied to each blade varies depending on the wind or the azimuth angle, causing the main shaft 4 to tilt, whereby the storage space 9 is narrowed or widened due to other parts, and the grease is stored. The space 9 passes through the gap 11. In this case as well, the grease or oil will flow to the grease retention portion 10 to function as an oil avoidance. Further, in the present embodiment, the sealing mechanism 8 for oil seal is provided, and leakage of grease or the like can be further reduced.

As shown in FIG. 4, the bearing retainer 7 is provided with an extrusion mechanism 12 that passes over the grease storage space 9 and the grease retention portion 10 to extrude the grease retained in the grease retention portion 10. Symbol 14 indicates the direction of rotation. The extrusion mechanism 12 is fixed by the bearing retainer 7 and is provided on the outer circumference of the main shaft 4. Since the extrusion mechanism 12 is fixed by the bearing retainer 7, the rotation of the spindle 4 can be rotated relative to the bottom surface of the grease retention portion 10. The oil remaining in the oil retention portion is returned to the grease storage space 9 by the relative rotational motion. At this time, since the extrusion mechanism 12 returns the grease or the like by the rotational power of the hub 2, no additional power is required.

Here, the sealing mechanism 8 such as an oil seal is provided on the opposite side of the grease storage space 9 with respect to the grease retention portion 10, and is configured to prevent grease or oil from leaking to the outside. With this configuration, it is possible to prevent the grease or oil which has not been extruded by the extrusion mechanism 12 from leaking from the bearing 3 in the sealing mechanism 8.

Further, as shown in FIG. 5, the lower end portion of the extrusion mechanism 12 is disposed at a position lower than the sealing mechanism 8, and is designed such that the grease or oil remaining in the grease retention portion 10 cannot be immediately discharged to the sealing mechanism 8. structure. In addition, the grease retention 10 itself is also located below the gap 11 which is connected to the sealing mechanism 8, so that it does not immediately flow out to the sealing mechanism 8. With this configuration, when the spindle 4 rotates, during the period in which the lubricating mechanism or the oil that reaches the grease retention portion 10 is retained by the extrusion mechanism 12, it stays in the grease retention portion 10, and the sealing mechanism 8 can be prevented. Side out.

Figure 6 is an explanatory view of the extrusion mechanism 12 in the present embodiment. Here, the extrusion mechanism 12 has an inclined portion 16 with respect to the bottom surface of the grease retention portion 10 in order to remove the grease or oil retained in the grease retention portion 10, and has the The grease or oil removed by the inclined portion 16 is guided toward the grease receiving space 9 by the guiding member. The guiding member is, for example, desirably provided with a facing portion 15 for draining grease with respect to the direction of rotation of the main shaft 4, and a wall portion 18 which is slightly parallel to the direction of rotation of the main shaft 4 is provided on the side of the sealing mechanism to avoid grease Or the oil is directed to the sealing mechanism 8. The opposing portion 15 may be disposed to be slightly inclined from the direction perpendicular to the rotational direction of the main shaft 4 toward the direction between the wall surface portion 18 (greater than 0 degrees and less than 180 degrees). By tilting 16 Tilt, the grease or oil can be lifted up from below. Then, the grease or the like that has been sucked up is induced by the wall surface portion 18 of the guiding member, and is returned from the opposing portion 15. By the presence of the wall portion 18, in addition to being able to guide the grease from the crucible, it is possible to prevent the flow in the direction unintended to be returned by the opposing portion 15. The wall portion 18 is closer to the inclined portion 16 side, and the receiving opening becomes wider, and has a shape in which the thickness is increased toward the opposing portion 15 after the grease or the like is widely incorporated. In this way, it is possible to smoothly return more grease and the like. In the present embodiment, the extrusion mechanism 12 corresponds to a conveying means for conveying grease or oil to the grease accommodating space 9. Of course, the vertical or parallel mentioned here does not need to be strict. As long as you can play back the function. Alternatively, the extrusion mechanism 12 may be provided with a plurality of bearing retainers 7.

The flow of the grease at the time of power generation in the wind power generation system configured as described above will be described. In the power generation, the force applied to each blade varies depending on the wind fluctuation or the azimuth angle, and the inclination of the blade 1 and the hub 2 to the outside of the rotating surface is transmitted to the main shaft or the like, causing the main shaft 4 to tilt. Due to the inclination of the outer surface, the accommodation space 9 is narrowed or widened. Therefore, the grease or oil stored in the grease storage space 9 flows from the storage space 9 through the gap 11 to the grease retention portion 10. The grease retention portion 10 is located below the gap 11 that is conducted to the sealing mechanism 8, so that the grease or oil temporarily stays in the grease retention portion 10. Then, during the period in which the grease or oil stays in the grease retention portion 10, the extrusion mechanism 12 reaches the grease retention portion 10 as the spindle 4 rotates. By the extrusion mechanism 12, the grease or oil retained in the grease retention portion 10 is lubricated. The gap 11 on the fat storage space side is sent back to the grease storage space 11. On the other hand, without being squeezed out by the extrusion mechanism 12, the grease or oil overflowing from the grease retention portion 10 passes through the gap 11 on the side of the sealing mechanism 8 to be conducted to the sealing mechanism 8, but by the sealing mechanism 8 It will prevent leakage to the outside.

According to the wind power generation system of the present embodiment, leakage of grease or oil can be reduced, and damage of the bearing due to insufficient grease/oil due to leakage of grease or oil can be prevented. In addition, the leakage of grease or oil can be reduced, so that the consumption of grease or oil can be reduced. In addition, since the leakage of grease or oil is reduced, it is possible to lengthen the grease or oil during replacement or replenishment, which simplifies maintenance/repair.

Example 2

In the present embodiment, the bearing is not provided on the rotating main shaft as in the first embodiment, but the fixed main shaft is provided separately from the outer side of the rotating main shaft. The same configuration as that of the first embodiment is omitted.

Fig. 7 is a view for explaining a connection mechanism between a hub and a rotating main shaft, and corresponds to a portion surrounded by a broken line in Fig. 1. As shown in the figure, the wind power generation system of the present embodiment has: a blade 1; and a hub 2 that supports the blade 1 and rotates together with the blade 1; and a main shaft 4 that is coupled to the hub 2 and that is accompanied by the rotation of the hub 2 Rotation; and the speed increaser 5 is connected to the main shaft 4 to increase the rotational speed; and the fixed spindle 17 is disposed on the outer diameter side of the main shaft 4 with respect to the main shaft 4 via a gap; and the frame 22, The fixed spindle 17 is supported and connected to the tower 20. Speed increaser 5, although not shown, a generator is connected, and the rotor of the generator is driven by the rotational power that increases the rotational speed by the speed increaser 5, and the power generation operation is performed. Further, the main shaft 4 is directly connected to the step portion inside the hub 2. Further, the main shaft 4 has a through hole 21 for an electric wire or a pipe for electric machine control inside the hub.

The fixing main shaft 17 that is connected to the frame 22 so as to enclose a part of the main shaft 4 does not rotate, and two bearings 3 are provided between the hub 2 and the fixing main shaft 17, and the weight of the blade 1 and the hub 2 is supported.

The hub 2 has an opening 23 on the side opposite to the speed increaser 5 with respect to the axial direction of the main shaft 4. The maximum diameter of the main shaft 4 is smaller than the inner diameter of the opening 23, and the main shaft 4 can be carried into the inside of the hub 2 through the opening 23.

The inner and outer diameters of the main shaft 4 are in the shape of a bellmouth that widens from the side of the speed increaser 5 toward the side of the connecting surface of the hub 2 with respect to the axial direction of the main shaft 4, thereby forming a main shaft having a difference in inner and outer diameters of the rotating main shaft. The plate thickness of 4 is closer to the connection surface with the hub 2 from the side of the speed increaser 5. Moreover, only the main shaft 4 and the bolt fastening portion of the hub 2 are in a thicker shape. The soft bell mouth shape portion adjacent to the hub side connecting portion of the main shaft 4 is partially deformed, whereby a structure in which both the axial direction and the radial direction of the main shaft 4 can absorb misalignment is obtained. In addition, the above thickness is set to further increase the absorption force.

The bearing 3 is arranged in a symmetrical manner with respect to the main shaft 4, and supports the fixed main shaft 17 instead of the rotating main shaft 4, which is implemented and implemented. Example 1 is different. However, the configuration of the periphery of the bearing 3 is basically the same as that of Embodiment 1. In the case of the outer wheel drive, the hub 2 rotates relative to the fixed main shaft 17, so that the bearing housing faces are opposite to the first embodiment in the drawings. The mechanism of the bearing described in the first embodiment can also be adapted to the case where the outer bearing rotates and the outer wheel is driven, and the same effect as in the first embodiment can be obtained.

Further, in each of the above embodiments, the grease of the grease retention portion 10 is extruded by the relative rotational movement of the spindle 4 with respect to the extrusion mechanism 12, but other power may be used. For example, the pump may be disposed around the bearing (specifically, for example, like the extrusion mechanism 12, it may be provided with the bearing retainer 7 across the grease storage space 9 and the grease retention portion 10), using electric power or oil pressure. The external power is pushed out to the grease storage space 9. The number of pumps set at this time may be one or plural.

3‧‧‧ Bearing

4‧‧‧ Spindle

6‧‧‧ bearing box

7‧‧‧ bearing retainer

8‧‧‧ Sealing mechanism

9‧‧‧Grease storage space

10‧‧‧ Grease retention

11‧‧‧ gap

12‧‧‧Grease extrusion mechanism

13‧‧‧The flow of grease or oil

15‧‧‧Guiding members (opposing parts)

16‧‧‧ inclined section

Claims (10)

A wind power generation system, comprising: a blade that rotates against wind; and a hub that supports the blade; and a bearing that supports a load of the hub; and a grease storage space that is connected to the bearing and that stores grease or The oil and the grease retention portion communicate with the grease storage space; and the conveying means transports the grease or oil retained in the grease retention portion to the grease storage space. The wind power generation system according to claim 1, wherein the conveying means conveys the grease or the oil by the rotational power of the hub. The wind power generation system according to claim 2, wherein the conveying means is an extrusion mechanism that extrudes the grease remaining in the grease retention portion. The wind power generation system according to claim 3, wherein the extrusion mechanism rotates relative to a bottom surface of the grease retention portion in accordance with rotation of the hub. The wind power generation system according to claim 4, wherein a sealing member is provided on a side opposite to the grease storage space with respect to the grease retention portion. The wind power generation system according to claim 5, wherein the lower end portion of the extrusion mechanism is located lower than the sealing member. The wind power generation system according to claim 3, wherein the extrusion mechanism is provided with respect to a rotation direction of the bearing Tilted slope. The wind power generation system according to claim 7, wherein the extrusion mechanism includes a guide member that is connected to the inclined portion and faces the grease that is retained in the grease retention portion toward the foregoing The inclined portion is guided. The wind power generation system according to claim 2, wherein the conveying means is pumping. The wind power generation system according to any one of claims 1 to 9, further comprising: a rotating main shaft connected to the hub; and a fixed main shaft disposed outside the radial direction of the rotating main shaft; It is attached to the aforementioned fixed spindle.