CN108150367B

CN108150367B - Yaw bearing assembly and wind generating set

Info

Publication number: CN108150367B
Application number: CN201711490939.0A
Authority: CN
Inventors: 邓志党; 翟永
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2017-12-30
Filing date: 2017-12-30
Publication date: 2020-06-02
Anticipated expiration: 2037-12-30
Also published as: WO2019128031A1; CN108150367A

Abstract

The invention relates to a yaw bearing assembly and a wind generating set, wherein the yaw bearing assembly comprises: the base comprises a first base body and a second base body which are mutually sleeved and coaxially arranged; the rotary connecting piece is connected to the first seat body and the second seat body and comprises a first bearing and a second bearing which are arranged in the axial direction of the first seat body and the second seat body at intervals, and the first seat body and the second seat body are rotatably connected through the first bearing and the second bearing. The yaw bearing assembly provided by the embodiment of the invention can be used for a yaw system of a wind generating set, and can reduce the width of a cabin of the wind generating set, reduce the cost and facilitate transportation on the basis of meeting the yaw requirement of the wind generating set.

Description

Yaw bearing assembly and wind generating set

Technical Field

The invention relates to the technical field of wind power, in particular to a yaw bearing assembly and a wind generating set.

Background

Wind power generation is a clean renewable energy source and is increasingly paid more attention by countries around the world. Because the wind direction of a wind field is constantly changed, in order to efficiently utilize wind energy, an impeller of a wind generating set needs to be always aligned with the wind direction when in operation, and a yaw system is an important component of the wind generating set for capturing the wind direction and can bear all gravity of a machine head of the machine set and all loads generated by the wind load. For this purpose, a yaw system is provided at the wind turbine generator system. The yawing system can be matched with a control system of the wind generating set, so that an impeller of the wind generating set can yaw, and further the impeller is always in a windward state, wind energy can be fully utilized, and the generating efficiency of the wind generating set is improved. Thus, the yaw system is an indispensable part of the wind park.

In the process of yawing movement of a traditional wind generating set, a yawing bearing of a yawing system of the traditional wind generating set needs to bear all gravity loads and wind loads of a machine head (including a cabin, an impeller and the like) of the set, and the machine head can rotate around the center of a tower. At present, all wind generating sets use a single-bearing yaw system, and as the wind generating sets develop towards high power, the load borne by a yaw bearing continuously increases, which requires that the diameter of the yaw bearing continuously increases. Correspondingly, the width of the nacelle is increased. The width of a cabin of a land wind generating set is limited by land transportation conditions, and the transportation width limit cannot exceed 4.5m, so that the existing single-bearing yaw rotation scheme cannot meet the use requirement of a yaw system of the wind generating set along with the increase of the power of the wind generating set.

Therefore, a new yaw bearing assembly and a wind turbine generator set are needed.

Disclosure of Invention

The embodiment of the invention provides a yaw bearing assembly and a wind generating set, wherein the yaw bearing assembly can be used for a yaw system of the wind generating set, and on the basis of meeting the yaw requirement of the wind generating set, the width of a cabin of the wind generating set can be reduced, the cost is reduced, and the transportation is convenient.

One aspect of the embodiments of the present invention provides a yaw bearing assembly for a wind turbine generator system, where the yaw bearing assembly includes: the base comprises a first base body and a second base body which are mutually sleeved and coaxially arranged; the rotary connecting piece is connected to the first seat body and the second seat body and comprises a first bearing and a second bearing which are arranged in the axial direction of the first seat body and the second seat body at intervals, and the first seat body and the second seat body are rotatably connected through the first bearing and the second bearing.

According to an aspect of the embodiment of the invention, the first base and the second base are both hollow columnar structures.

According to an aspect of the embodiments of the present invention, the first seat body includes a first end portion and a second end portion opposite to each other in an axial direction of the first seat body, the second seat body includes a third end portion and a fourth end portion opposite to each other in the axial direction of the second seat body, the first bearing is connected to the first end portion and the third end portion, and the second bearing is connected to the second end portion and the fourth end portion.

According to an aspect of the embodiment of the present invention, the first end portion and/or the second end portion is an annular protrusion structure extending along an axial direction or a radial direction of the first seat body; the third end part and/or the fourth end part are annular protruding structures extending along the axial direction or the radial direction of the second seat body.

According to an aspect of the embodiment of the invention, the first base and/or the second base is provided with a mounting part for mounting a yaw driving component of the wind generating set.

According to an aspect of the embodiment of the invention, a connecting portion is arranged on the first seat body or the second seat body, and the connecting portion is located between the first bearing and the second bearing and is used for connecting a generator or an impeller of the wind generating set.

According to an aspect of the embodiment of the invention, the connecting portion is a flange, and an axis of the connecting portion intersects with axes of the first seat and the second seat.

According to an aspect of an embodiment of the present invention, the base is a tapered cylindrical structure, and a radial dimension of the first bearing is larger than a radial dimension of the second bearing.

According to an aspect of the embodiment of the present invention, the swivel connector further includes a third bearing connected to the first housing and the second housing and located between the first bearing and the second bearing.

According to the yaw bearing assembly provided by the embodiment of the invention, the yaw bearing assembly comprises a base and a rotary part, wherein the base comprises a first base body and a second base body which are sleeved with each other and are coaxially arranged, a rotary connecting piece is connected to the first base body and the second base body, the rotary connecting piece comprises a first bearing and a second bearing which are arranged at intervals in the axial direction of the first base body and the second base body, the first base body and the second base body are rotatably connected through the first bearing and the second bearing, when the yaw bearing assembly is applied to a wind generating set, one of the first base body and the second base body can be connected with a tower barrel, and the other can be connected with a cabin. Under the effect of driftage drive unit, can drive first pedestal and second pedestal relative rotation, and then make the cabin can rotate a tower section of thick bamboo relatively, because the driftage bearing assembly includes first bearing and second bearing, single bearing structure relatively for the radial width of driftage bearing assembly is littleer, under the driftage requirement prerequisite that satisfies wind generating set, can reduce wind generating set's cabin width, and then reduce wind generating set's cost and be convenient for the transportation.

According to another aspect of an embodiment of the present invention, there is provided a wind turbine generator system, including: a tower drum; the engine room is stacked with the tower barrel in the axial direction of the tower barrel and comprises an engine room cover; a generator connected to the nacelle; the impeller is connected to the generator; in the yaw bearing assembly, one of the first base and the second base is connected with the tower, and the other is connected with the engine room; and the yaw driving part is connected with the yaw bearing assembly so as to drive the first seat body and the second seat body to rotate relatively.

According to another aspect of an embodiment of the invention, a yaw bearing assembly is provided within the nacelle cover, and when the yaw bearing assembly comprises a connection, the generator or the impeller is connected to the connection.

According to another aspect of the embodiment of the present invention, the yaw driving unit includes a driving motor, and the driving motor is in transmission fit with the first bearing and/or the second bearing to drive the first base and the second base to rotate relatively.

According to another aspect of the embodiment of the present invention, the yaw driving part includes two or more telescopic cylinders, the two or more telescopic cylinders are disposed at intervals, each telescopic cylinder includes a cylinder body and a cylinder rod, one of the cylinder body and the cylinder rod is rotatably connected to the first seat body, and the other one of the cylinder body and the cylinder rod is rotatably connected to the second seat body, so as to drive the first seat body and the second seat body to rotate relatively.

The wind generating set provided by the embodiment of the invention comprises a tower barrel, a cabin, an impeller, the yaw bearing assembly and the yaw driving component, wherein one of a first seat body and a second seat body of the yaw bearing assembly is connected with the tower barrel, and the other seat body is connected with the cabin. Because the yaw bearing assembly comprises the first bearing and the second bearing, compared with a single bearing structure, the radial width of the yaw bearing assembly is smaller, and the width of the engine room can be reduced on the premise of ensuring the yaw requirement of the wind power generation set provided by the embodiment of the invention, so that the cost of the wind power generation set is reduced, and the wind power generation set is convenient to transport.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an isometric view of a yaw bearing assembly of an embodiment of the present invention;

FIG. 2 is a cross-sectional structural schematic view of the yaw bearing assembly shown in FIG. 1;

FIG. 3 is an isometric view of the first housing shown in FIG. 1;

FIG. 4 is an isometric view of the second receptacle shown in FIG. 1;

FIG. 5 is an isometric view of another embodiment of a yaw bearing assembly of the present invention;

FIG. 6 is a cross-sectional structural schematic view of the yaw bearing assembly shown in FIG. 5;

FIG. 7 is a schematic cross-sectional view of a wind turbine generator system according to an embodiment of the present invention;

FIG. 8 is a schematic view of a portion of the wind turbine generator system shown in FIG. 7;

FIG. 9 is a schematic cross-sectional view of a wind turbine generator system according to another embodiment of the present invention;

fig. 10 is a partial structural schematic view of the wind turbine generator system shown in fig. 9.

1-a yaw bearing assembly;

10-a base;

11-a first seat body; 111-a first body portion; 112-a first end portion; 113-a second end; 114-lightening holes;

12-a second seat body; 121-a second body portion; 122-a third end; 123-a fourth end;

21-a first bearing; 22-a second bearing;

30-a mounting portion;

31-a first flange; 32-a second flange; 33-connecting holes; 34-a stiffener;

31 a-bump structure; 32 a-a disk-like structure;

40-a connecting part;

2, a tower barrel;

3-a cabin; 301-nacelle cover; 302-a generator;

4-an impeller;

5-a yaw drive component; 501-cylinder body; 502-cylinder rod;

6-a transition piece.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following description is given with the directional terms as they are used in the drawings and is not intended to limit the yaw bearing assembly and the wind turbine generator system of the present invention to the specific configuration shown. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

For a better understanding of the present invention, a yaw bearing assembly and a wind turbine generator set according to embodiments of the present invention will be described in detail below with reference to fig. 1 to 10.

Referring to fig. 1 together, fig. 1 shows an isometric view of a yaw bearing assembly 1 according to an embodiment of the invention, and fig. 2 shows a schematic cross-sectional view of the yaw bearing assembly 1 shown in fig. 1.

The yaw bearing assembly 1 provided by the embodiment of the invention is used for a wind generating set, the yaw bearing assembly 1 comprises a base 10 and a rotary connecting piece, and the base 10 comprises a first base body 11 and a second base body 12 which are mutually sleeved and coaxially arranged. The rotation connecting member is connected to the first seat 11 and the second seat 12, the rotation connecting member includes a first bearing 21 and a second bearing 22 spaced apart from each other in the axial direction of the first seat 11 and the second seat 12, and the first seat 11 and the second seat 12 are rotatably connected through the first bearing 21 and the second bearing 22.

Therefore, the yaw bearing assembly 1 provided by the embodiment of the invention can be used for a yaw system of a wind generating set, and can reduce the width of the engine room 3 of the wind generating set, reduce the cost and facilitate transportation on the basis of meeting the yaw requirement of the wind generating set.

Preferably, the first seat body 11 and the second seat body 12 are both hollow columnar structures, so that the installation between the rotary connecting pieces is facilitated, the processing and the transportation are facilitated, meanwhile, the materials can be saved, and the cost is reduced. In this embodiment, the first seat 11 and the second seat 12 are both hollow cylindrical structures, and the first seat 11 is located inside the second seat 12, that is, the second seat 12 is sleeved on the first seat 11.

Referring to fig. 3, fig. 3 is an isometric view of the first seat 11 shown in fig. 1. The first seat 11 includes a first main body 111 extending in an axial direction thereof, and in order to facilitate installation of the first bearing 21 and the second bearing 22, the first seat 11 further includes a first end 112 and a second end 113 respectively connected to two ends of the first main body 111 in the axial direction, the first end 112 and the second end 113 are annular protrusion structures extending in a radial direction of the first seat 11, the first end 112 and the second end 113 form the first seat 11 together with the first main body 111, and the first end 112 and the second end 113 may be an integrally formed structure with the first main body 111, and may also be connected to the first main body 111 by welding or fastening members.

In order to further reduce the overall weight of the yaw bearing assembly 1, the first housing 11 is provided with lightening holes 114, the lightening holes 114 are preferably provided on the first main body portion 111 of the first housing 11, the number of the lightening holes 114 may be set according to specific requirements, and may be one, or may be two or more, and when the number is two or more, the two or more lightening holes 114 are uniformly provided in the circumferential direction of the first main body portion 111.

Referring to fig. 4, fig. 4 is an isometric view of the second seat 12 shown in fig. 1. The second seat 12 includes a second main body 121 extending in an axial direction thereof, similarly, for the installation of the first bearing 21 and the second bearing 22, the second seat 12 further includes a third end 122 and a fourth end 123 respectively connected to two ends of the second main body 121 in the axial direction, the third end 122 and the fourth end 123 are annular protrusion structures extending in a radial direction of the second seat 12, the third end 122 and the fourth end 123 and the second main body 121 together form the second seat 12, the third end 122 and the fourth end 123 may be an integrally formed structure with the second main body 121, and of course, may also be connected to the second main body 121 by welding or fastening members. When the first seat 11 and the second seat 12 are coupled to each other, the first end 112 and the third end 122 are disposed at an interval, and the second end 113 and the fourth end 123 are disposed at an interval.

In the present embodiment, the same type of bearing may be used for the first bearing 21 and the second bearing 22, but different types of bearings may be used, and the first bearing 21 and the second bearing 22 may be any of other types of bearings such as a radial ball bearing, a cylindrical roller bearing, a tapered roller bearing, and a sliding bearing.

The first bearing 21 is sleeved on the periphery of the first base 11 and connected to the first end 112 of the first base 11 and the third end 122 of the second base 12, the second bearing 22 is sleeved on the periphery of the first base 11 and connected to the second end 113 of the first base 11 and the fourth end 123 of the second base 12, and the first bearing 21 and the second bearing 22 are matched with the first base 11 and the second base 12 in the above manner, so that the yaw bearing assembly 1 is stressed more uniformly when applied to a wind turbine generator set.

Meanwhile, considering the driving requirement of the yaw bearing assembly 1 when applied to the wind power generation set, the outer rings of the first bearing 21 and the second bearing 22 are respectively connected to the first seat 11, and the inner rings of the first bearing 21 and the second bearing 22 are respectively connected to the second seat 12, in this embodiment, the first bearing 21 is clamped between the first end 112 and the third end 122, and the second bearing 22 is clamped between the second end 113 and the fourth end 123.

Specifically, the outer ring of the first bearing 21 and the outer ring of the second bearing 22 are respectively connected to the first end 112 and the second end 113 of the first seat 11, and the inner ring of the first bearing 21 and the inner ring of the second bearing 22 are respectively connected to the third end 122 and the fourth end 123 of the second seat 12, and when connecting, they can be connected by welding, and naturally, for convenience of disassembly and replacement, the first bearing 21, the second bearing 22 and the corresponding ends are preferably connected by a connecting member such as a bolt.

The first base body 11 and the second base body 12 adopt the above structure, which not only can satisfy the connection requirement of the inner ring and the outer ring of the first bearing 21 and the second bearing 22, but also can facilitate the maintenance and replacement of the first bearing 21 and the second bearing 22, and improve the service life of the yaw bearing assembly 1.

As an alternative embodiment, since the first seat 11 and the second seat 12 are rotatably connected, when the yaw driving component is applied to the wind generating set, the yaw driving component is required to drive the two to rotate relatively, so as to meet the pitch requirement of the wind generating set. Therefore, as an alternative embodiment, in the present embodiment, the outer ring of the first bearing 21 and the outer ring of the second bearing 22 are provided with meshing gear teeth. So that the first bearing 21 and the second bearing 22 can be engaged with the yaw driving component for transmission, and the first seat 11 and the second seat 12 can rotate relatively. As shown in fig. 1 and 4, in order to facilitate mounting of the yaw driving unit, a mounting portion 30 for mounting the yaw driving unit of the wind turbine generator set is provided on the second housing 12. The mounting portion 30 may have a different structure as long as it can satisfy the mounting of the yaw driving part.

In this embodiment, the second seat 12 is provided with mounting portions 30 corresponding to the first bearing 21 and the second bearing 22, each mounting portion 30 includes a flange structure extending along the radial direction of the second seat 12 and having a certain thickness in the axial direction of the second seat 12, and the flange structure is preferably in a sector ring shape. The flange structure of each mounting portion 30 includes two layers, which are a first flange 31 and a second flange 32, respectively, the first flange 31 and the second flange 32 are parallel to each other and spaced apart from each other, and each mounting portion 30 is provided with a connecting hole 33 penetrating through the first flange 31 and the second flange 32 in the thickness direction thereof. The two flange structures of the mounting portion 30 may be connected by a stiffener 34, the number of the connection holes 33 on each mounting portion 30 is not particularly limited, and may be set according to the number of yaw driving members, and the number of the connection holes 33 of the mounting portion 30 corresponding to the first bearing 21 and the mounting portion 30 corresponding to the second bearing 22 may be the same or different.

As an alternative embodiment, the connecting portion 40 is disposed on the second seat 12 for connecting a generator or an impeller of the wind turbine generator system, and the connecting portion 40 may have a different structure as long as the connection of the generator or the impeller is satisfied. The connection portion 40 is preferably located between the first bearing 21 and the second bearing 22, so that when the yaw bearing assembly 1 is connected to the generator or the impeller, the bending moment generated by the gravity load and the wind load of the nacelle and the impeller at the yaw center is converted into the radial load of the first bearing 21 and the second bearing 22, so that the first bearing 21 only bears the radial load and does not bear the bending moment. Under the condition of the same nose form and the same weight, the radial sizes of the first bearing 21 and the second bearing 22 can be further reduced, so that land transportation of the ultra-large megawatt unit cabin is possible.

In this embodiment, the connection portion 40 preferably has a flange structure, which facilitates processing and can ensure the connection strength to the generator or the impeller. The axis of the connecting portion 40, that is, the axis of the flange, intersects with the axes of the first seat 11 and the second seat 12, so as to be connected to the generator or the impeller, and meanwhile, the stress of the first bearing 21 and the stress of the second bearing 22 can be more balanced, the flange is preferably located on the second main body portion 121 of the second seat 12 and is of an integrated structure with the second main body portion 121, so that the overall strength of the yaw bearing assembly 1 can be ensured, and further, when the generator or the impeller is connected, the stability of the yaw bearing assembly 1 can be ensured.

As an optional implementation manner, the base 10 is integrally in a tapered structure, specifically, the first base 11 and the second base 12 are both in a tapered cylindrical structure and have matching shapes, and accordingly, the radial size of the first bearing 21 is greater than that of the second bearing 22, so that on the basis of meeting the yaw requirement of the wind turbine generator system, the radial sizes of the first bearing 21 and the second bearing 22 can be reduced to the greatest extent, the overall cost of the yaw bearing assembly 1 is reduced, and meanwhile, the base 10 is in a tapered structure, so that the overall stability of the yaw bearing assembly 1 can be further improved, and when the base is used for the wind turbine generator system, the stability of the yaw action of the wind turbine generator system can be ensured.

As a preferred embodiment, the swivel connector further includes a third bearing (not shown), the third bearing is connected to the first housing 11 and the second housing 12 and located between the first bearing 21 and the second bearing 22, that is, the yaw swivel bearing is not limited to include only two bearings, that is, the first bearing 21 and the second bearing 22, the correspondingly disposed third bearing can reduce the bearing capacity of each bearing of the swivel connector, and the number of the third bearings may be one, or of course, may be two or more, and may be set according to the bearing requirement.

It should be understood that first end 112 and second end 113 are not limited to the annular protrusion extending along the radial direction of first housing 11, and referring to fig. 5 together, fig. 5 shows an isometric view of another embodiment of yaw bearing assembly 1, and fig. 6 shows a schematic cross-sectional view of yaw bearing assembly 1 shown in fig. 5. The embodiment is substantially the same as the embodiment shown in fig. 1, except that the second end 113 of the first housing 11 is an annular protrusion structure extending along the axial direction of the first housing 11, in which case the inner ring of the second bearing 22 is connected to the second end 113 of the first housing 11, and the outer ring is connected to the fourth end 123 of the second housing 12, and the yaw bearing assembly 1 provided in this embodiment is preferably applied to a wind turbine generator set, and the applied yaw driving component is preferably in the form of a telescopic cylinder.

Accordingly, in order to facilitate the installation of the telescopic cylinder, the installation part 30 of the present embodiment is different from the embodiment of the embodiment shown in fig. 1. The mounting portion 30 of the present embodiment includes a protruding structure 31a connected to the second seat 12 and a disc structure 32a connected to the first seat 11, the protruding structure 31a and the second seat 12 can be detachably connected by a fastener such as a bolt, or can be fixedly connected to the second seat 12 by welding, and the disc structure 32a and the first seat 11 can be detachably connected by a fastener such as a bolt, or can be fixedly connected to the first seat 11 by welding.

Of course, the embodiment shown in fig. 5 is only one of preferable modes, in some embodiments, the first end portion 112 and the second end portion 113 of the first seat 11 may also be both annular protruding structures extending along the axial direction of the first seat 11, and the third end portion 122 and the fourth end portion 123 of the second seat 12 may also be both annular structures extending along the axial direction of the second seat 12, at this time, the inner rings of the first bearing 21 and the second bearing 22 are respectively connected with the first end portion 112 and the second end portion 113 of the first seat 11, and correspondingly, the outer ring of the first bearing 21 and the outer ring of the second bearing 22 are respectively connected with the third end portion 122 and the fourth end portion 123 of the second seat 12. As long as the connection requirements of the first bearing 21 and the second bearing 22 with the first seat 11 and the second seat 12 are satisfied, the driving is convenient when the wind turbine generator system is applied.

It is understood that the mounting portion 30 of the yaw bearing assembly 1 of the above embodiments is located on the second housing 12 or both the first housing 11 and the second housing 12. In some alternative embodiments, when the yaw bearing assembly 1 is applied to a wind turbine generator set, and the first housing 11 is connected to the nacelle and the second housing 12 is connected to the tower 2, a corresponding yaw driving component, such as a driving motor, for driving the first housing 11 and the second housing 12 of the base 10 to rotate relatively may be located in the first housing 11. Therefore, in some embodiments, the mounting portion 30 may be only disposed on the second seat 12, and when the first seat 11 located in the second seat 12 rotates, the generator and the impeller may be directly connected to the nacelle, and may not be connected to the connecting portion 40, so as to ensure the yaw requirement of the wind turbine generator system.

Therefore, when the yaw bearing assembly 1 provided by the embodiment of the invention is applied to a wind generating set, one of the first base 11 and the second base 12 can be connected to a tower, and the other can be connected to a nacelle, and under the action of the yaw driving component, the first base 11 and the second base 12 can be driven to rotate relatively, so that the nacelle can rotate relatively to the tower. Because the yaw bearing assembly 1 comprises the first bearing 21 and the second bearing 22, preferably further comprises the third bearing, and the radial width of the yaw bearing assembly 1 is smaller compared with that of a single bearing structure, on the premise of meeting the yaw requirement of the wind generating set, the width of the engine room of the wind generating set can be reduced, the cost of the wind generating set is further reduced, and the transportation is facilitated.

Referring to fig. 7, fig. 7 is a schematic cross-sectional view of a wind turbine generator system according to an embodiment of the present invention, and fig. 8 is a schematic partial view of the wind turbine generator system shown in fig. 7.

The embodiment of the invention further provides a wind generating set, which comprises a tower 2, a nacelle 3, a generator 302, an impeller 4, the yaw bearing assembly 1 and a yaw driving component 5 of the embodiments, wherein the nacelle 3 is stacked with the tower 2 in the axial direction of the tower 2, the nacelle 3 comprises a nacelle cover 301, the generator 302 is connected to the nacelle 3, and the impeller 4 is connected to the generator 302. One of the first base 11 and the second base 12 of the yaw bearing assembly 1 is connected to the tower 2, and the other is connected to the nacelle 3. The yaw driving part 5 is connected to the yaw bearing assembly 1 to drive the first base 11 and the second base 12 to rotate relatively.

Specifically, in the present embodiment, the yaw bearing assembly 1 is preferably the yaw bearing assembly 1 shown in fig. 1, the first base 11 of the yaw bearing assembly 1 is connected to the tower 2, and the second base 12 is connected to the nacelle 3. The first base body 11 and the tower 2 may be welded or connected by fasteners such as bolts, the nacelle cover 301 of the nacelle 3 and the second base body 12 may be in transition connection by using a transition piece 6, the transition piece 6 may be directly connected to the second base body 12 or indirectly connected to the second base body by using an installation part 5, and the transition piece 6 may be a plate-shaped structure, or of course, may be in a structure of other form, and connects the nacelle cover 301 and the second base body 12 by using the transition piece 6.

The yaw driving unit 5 employs a driving motor, and in order to adjust the relative rotation speed of the first seat 11 and the second seat 12, an output end of the driving motor may be connected to a speed reducer, the speed reducer and the driving motor may be an integrated structure, and when the yaw bearing assembly 1 includes the mounting portion 30, the yaw driving unit 5 is preferably mounted on the mounting portion 30. In this embodiment, the yaw driving component 5 is disposed at a corresponding position of the first bearing 21 and the second bearing 22, an output end of the yaw driving component 5 is a driving wheel, and an output end of the yaw driving component 5 is in transmission fit with the corresponding first bearing 21 and the corresponding second bearing 22 through a transmission belt, a transmission chain or a driving wheel, and is preferably connected by a driving wheel, such as a gear in meshing transmission fit.

Because the wind generating set provided by the embodiment of the invention comprises the yaw bearing assembly 1 of each embodiment, when the engine room 3 and the impeller 4 need to yaw, the yaw driving part 5 drives the second base 12 to rotate relative to the first base 11, and the second base 12 is connected with the engine room cover of the engine room 3, so that the engine room 3 and the impeller 4 are driven to rotate in the rotating process of the second base 12, and the yaw is realized. Because the yaw bearing assembly 1 adopts a double-bearing structure, even a multi-bearing structure, the wind generating set can better meet the yaw requirement compared with the traditional wind generating set which adopts a single-bearing structure to change the pitch, the cost of the double-bearing or multi-bearing assembly is lower than that of the single-bearing structure with larger radial dimension, meanwhile, because the yaw bearing with larger radial dimension is not needed, the width of the engine room 3 can be effectively reduced, the cost of the wind generating set is further reduced, and the transportation is convenient,

as the adopted yaw bearing assembly 1 is of a modular structure, the yaw bearing assembly can be pre-assembled and then installed on the wind generating set. And be connected with parts such as cabin 3, tower section of thick bamboo 2, can not increase the assembly process for traditional wind generating set, the installation of being convenient for. When the yaw bearing assembly 1 is used for a wind generating set, the structure of other components such as the tower drum 2 does not need to be changed, and the tower drum 2 can adopt a cylindrical structure with a uniform cross section along the axial direction of the tower drum 2, so that the structural strength of the other components such as the tower drum 2 is not influenced. Simultaneously, driftage bearing assembly 1 when being connected with tower section of thick bamboo 2, can directly be connected with the flange structure at 2 tops of tower section of thick bamboo, need not additionally to set up structures such as supporting disk or braced frame, on the basis that satisfies above-mentioned requirement, reduces the use material, and then reduce cost.

As an alternative embodiment, the yaw bearing assembly 1 is preferably arranged in the nacelle cover 301, by which the operation is simple and the installation and maintenance of the yaw bearing assembly 1 is facilitated. More preferably, when yaw bearing assembly 1 includes connecting portion 40, generator 302 or impeller 4 is connected to connecting portion 40, the wind turbine generator system in this embodiment is a direct-drive wind turbine generator system, generator 302 is located outside nacelle cover 301, therefore, in this embodiment, generator 302 is connected to connecting portion 40, and of course, when the wind turbine generator system is of another type, such as a double-fed wind turbine generator system, it is preferable that impeller 4 is connected to connecting portion 40.

Similarly, as mentioned above, the generator 302 or the impeller 4 is connected to the connection portion 40, and the connection portion 40 is preferably located between the first bearing 21 and the second bearing 22, so that the bending moment generated by the gravity load and the wind load of the nacelle 3 and the impeller 4 at the yaw center is converted into the radial load of the first bearing 21 and the second bearing 22, and the first bearing 21 only bears the radial load and does not bear the bending moment.

Referring to fig. 9, fig. 9 is a schematic cross-sectional view of a wind turbine generator system according to another embodiment of the present invention, and fig. 10 is a schematic partial view of the wind turbine generator system shown in fig. 9. The embodiment of the present embodiment is substantially the same as the embodiment shown in fig. 7, except that the yaw bearing assembly 1 of the present embodiment adopts the yaw bearing assembly 1 shown in fig. 5, meanwhile, the yaw driving part 5 of the present embodiment includes more than two telescopic cylinders, the more than two telescopic cylinders are arranged at intervals, the telescopic cylinder includes a cylinder body 501 and a cylinder rod 502, one of the cylinder body 501 and the cylinder rod 502 is rotatably connected with the first seat 11, and the other is rotatably connected with the second seat 12 to drive the first seat 11 and the second seat 12 to rotate relatively.

Preferably, the number of the telescopic cylinders of this embodiment is two, the cylinder bodies 501 of the two telescopic cylinders are hinged to the first base body 11, specifically, the cylinder bodies can be hinged to the first base body 11 through the disc structures 32a of the mounting portions 30, the cylinder rods 502 of the two telescopic cylinders are hinged to the second base body 12, specifically, the cylinder bodies can be hinged to the bump structures 31a of the mounting portions 30, the axes of the two telescopic cylinders are preferably parallel to each other, the first base body 11 and the second base body 12 can rotate relatively by driving the telescopic cylinders to extend and retract, and further, the yaw requirement of the wind turbine generator set can be met. The telescopic cylinder in the embodiment can be a pneumatic cylinder, a hydraulic cylinder or an electric cylinder.

It can be understood that the number of the telescopic cylinders is not limited to two, and may be three or more, and specifically may be set according to the driving requirement of the yaw bearing assembly 1, and when there are a plurality of telescopic cylinders, the telescopic cylinders may be uniformly arranged around the axes of the first seat 11 and the second seat 12, so as to better meet the driving requirement.

It is understood that, the first base 11 of the yaw bearing assembly 1 of the wind generating set of each embodiment is connected to the tower 2, and the second base 12 is connected to the nacelle 3, which is a preferred embodiment, but not limited to the above form, in some alternative embodiments, the second base 12 may be connected to the tower 2, and the first base 11 may be connected to the nacelle 3, at this time, the transition piece 6 may be used to connect the top of the nacelle 3 to the first base 11, and the position of the yaw driving component 5 may be changed accordingly, as long as the yaw requirement of the wind generating set can be met.

Therefore, according to the yaw bearing assembly 1 and the wind generating set provided by the embodiment of the invention, the yaw bearing assembly 1 can be used for a yaw system of the wind generating set, and on the basis of meeting the yaw requirement of the wind generating set, the width of the engine room 3 of the wind generating set can be reduced, the cost is reduced, the transportation is convenient, and the popularization and the use are easy.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A wind turbine generator set, comprising:

a tower (2);

a nacelle (3) stacked on the tower (2) in the axial direction of the tower (2), the nacelle (3) including a nacelle cover (301);

a generator (302) connected to the nacelle (3);

an impeller (4) connected to the generator (302);

a yaw bearing assembly (1), the yaw bearing assembly (1) comprising:

a base (10) comprising a first seat body (11) and a second seat body (12) which are mutually sleeved and coaxially arranged,

the rotary connecting piece is connected to the first seat body (11) and the second seat body (12), the rotary connecting piece comprises a first bearing (21) and a second bearing (22) which are arranged in the axial direction of the first seat body (11) and the second seat body (12) at intervals, the first seat body (11) and the second seat body (12) are rotatably connected through the first bearing (21) and the second bearing (22), a mounting part (30) is arranged on the first seat body (11) and/or the second seat body (12), the mounting part (30) comprises a convex block structure (31 a) connected to the second seat body (12) and a disc-shaped structure (32 a) connected to the first seat body (11),

one of the first seat body (11) and the second seat body (12) is connected with the tower (2), and the other is connected with the engine room (3);

and the yaw driving part (5) comprises more than two telescopic cylinders, and the telescopic cylinders are connected with the lug structure (31 a) and the disc-shaped structure (32 a) and can drive the first base body (11) and the second base body (12) to rotate relatively.

2. Wind turbine generator system according to claim 1, characterised in that said first seat (11) and said second seat (12) are both hollow cylindrical structures.

3. Wind park according to claim 2, wherein the first seat (11) comprises, in its own axial direction, a first end (112) and a second end (113) opposite each other, the second seat (12) comprises, in its own axial direction, a third end (122) and a fourth end (123) opposite each other, the first bearing (21) being connected to the first end (112) and to the third end (122), the second bearing (22) being connected to the second end (113) and to the fourth end (123).

4. A wind park according to claim 3, wherein the first end (112) and/or the second end (113) is an annular projection extending in an axial or radial direction of the first seat (11); the third end portion (122) and/or the fourth end portion (123) are annular protruding structures extending along the axial direction or the radial direction of the second holder body (12).

5. Wind park according to any of claims 1 to 4, wherein a connection part (40) is provided on the first seat (11) or the second seat (12), the connection part (40) being located between the first bearing (21) and the second bearing (22) for connecting a generator (302) or an impeller (4) of the wind park.

6. Wind park according to claim 5, wherein the connecting portion (40) is a flange and the axis of the connecting portion (40) intersects the axes of the first and second seats (11, 12).

7. Wind park according to any one of claims 1 to 4, wherein the base (10) is of generally conical cylindrical configuration, the first bearing (21) having a radial dimension greater than the radial dimension of the second bearing (22).

8. Wind park according to any of claims 1 to 4, wherein the swivel connection further comprises a third bearing connected to the first housing (11) and the second housing (12) and located between the first bearing (21) and the second bearing (22).

9. Wind park according to claim 5, wherein the yaw bearing assembly (1) is arranged within the nacelle cover (301); when the yaw bearing assembly (1) comprises the connection (40), the generator (302) or the impeller (4) is connected with the connection (40).

10. The wind generating set according to claim 1, wherein two or more telescopic cylinders are arranged at a distance from each other, the telescopic cylinders include a cylinder body (501) and a cylinder rod (502), one of the cylinder body (501) and the cylinder rod (502) is rotatably connected to the first seat (11), and the other is rotatably connected to the second seat (12) to drive the first seat (11) and the second seat (12) to rotate relatively.