CN111322197B - Wind generating set and variable-pitch bearing assembly - Google Patents
Wind generating set and variable-pitch bearing assembly Download PDFInfo
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- CN111322197B CN111322197B CN201811544744.4A CN201811544744A CN111322197B CN 111322197 B CN111322197 B CN 111322197B CN 201811544744 A CN201811544744 A CN 201811544744A CN 111322197 B CN111322197 B CN 111322197B
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- 238000010248 power generation Methods 0.000 claims description 3
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0224—Adjusting blade pitch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/70—Bearing or lubricating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05B2260/79—Bearing, support or actuation arrangements therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Wind Motors (AREA)
Abstract
The invention relates to a wind generating set and a variable pitch bearing assembly, wherein the wind generating set comprises: the impeller comprises a hub and blades; the variable pitch system comprises a variable pitch bearing assembly, the variable pitch bearing assembly comprises a first bearing and a second bearing, one of the first bearing and the second bearing is a cylindrical bearing, the other bearing can bear axial load and radial load, the first bearing comprises a first inner ring and a first outer ring, the second bearing comprises a second inner ring and a second outer ring, the first inner ring and the second inner ring are connected to form an inner ring group, the first outer ring and the second outer ring are connected to form an outer ring group, at least one blade is connected with a hub through the variable pitch bearing assembly, one of the inner ring group and the outer ring group is connected with the hub, and the other is connected with the blade. According to the wind generating set and the variable pitch bearing assembly provided by the embodiment of the invention, the variable pitch bearing assembly can be used for connecting a hub and a blade of the wind generating set, so that the wind generating set is low in cost and has higher safety performance.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a wind generating set and a variable pitch bearing assembly.
Background
The wind generating set is a device for converting wind energy into electric energy, and in the wind generating set, a variable pitch system can change the attack angle of airflow to blades by adjusting the angle of the blades, so that the aerodynamic force acquired by the wind generating set is changed, the wind generating set outputs according to the designed output power, and the variable pitch system plays a crucial role in the wind generating set.
The variable pitch bearing belongs to a key part in a variable pitch system and is mainly used as a connecting part of a blade and a hub, and the circular motion of the blade is realized through the direct relative motion of a bearing rolling body and a raceway. However, the pitch bearing in the prior art is unreasonable in structural arrangement, so that when the pitch bearing is applied to a wind generating set, blades are easily dropped, and the cost of the wind generating set is increased.
Therefore, a new wind generating set and a pitch bearing assembly are needed.
Disclosure of Invention
The embodiment of the invention provides a wind generating set and a variable pitch bearing assembly, wherein the variable pitch bearing assembly can be used for connecting a hub and a blade of the wind generating set, so that the connection strength between the hub and the blade is ensured, the cost of the wind generating set is low, and the wind generating set has higher safety performance.
An embodiment of the present invention provides a wind turbine generator system, including: the impeller comprises a hub and more than two blades which are respectively connected with the hub; the variable pitch system comprises a variable pitch bearing assembly, wherein the variable pitch bearing assembly comprises a first bearing and a second bearing which is arranged in an axial direction of the first bearing and is mutually stacked with the first bearing, one of the first bearing and the second bearing is a cylindrical bearing, the other one of the first bearing and the second bearing can bear axial load and radial load, the first bearing comprises a first inner ring and a first outer ring, the second bearing comprises a second inner ring and a second outer ring, the first inner ring and the second inner ring are mutually connected to form an inner ring group, and the first outer ring and the second outer ring are mutually connected to form an outer ring group; wherein, at least one blade is connected with the hub through a variable-pitch bearing assembly, one of the inner ring group and the outer ring group is connected with the hub, and the other one is connected with the opposite blade.
According to an aspect of an embodiment of the invention, the first bearing is a cylindrical bearing and is arranged adjacent to the hub, and the second bearing is a ball bearing or a tapered roller bearing and is arranged adjacent to the blade.
According to an aspect of an embodiment of the present invention, the first bearing is a single-row cylindrical roller bearing and the second bearing is a single-row four-point contact type ball bearing.
According to an aspect of the embodiment of the present invention, the first inner ring is provided with two or more first through holes that are arranged at intervals in the circumferential direction of the first bearing and extend in the axial direction, the second inner ring is provided with at least two or more second through holes that are arranged in one-to-one correspondence with the first through holes, the first connecting members are arranged in the corresponding first through holes and second through holes, and one of the hub and the blade, the first inner ring, and the second inner ring are connected to each other through the first connecting members.
According to one aspect of the embodiment of the invention, the first outer ring is provided with more than two third through holes which are arranged at intervals along the circumferential direction of the first bearing and extend along the axial direction, the second outer ring is provided with at least more than two fourth through holes which are arranged in one-to-one correspondence with the third through holes, second connecting pieces are arranged in the corresponding third through holes and the corresponding fourth through holes, and one of the hub and the blade, the first outer ring and the second outer ring are connected with each other through the second connecting pieces.
According to an aspect of an embodiment of the invention, an inner diameter of the first inner ring is the same as an inner diameter of the second inner ring, and/or an outer diameter of the first inner ring is the same as an outer diameter of the second inner ring.
According to an aspect of an embodiment of the invention, the inner diameter of the first outer ring is the same as the inner diameter of the second outer ring, and/or the outer diameter of the first outer ring is the same as the outer diameter of the second outer ring.
According to an aspect of an embodiment of the invention, each blade is connected to the hub by a respective pitch bearing assembly.
According to an aspect of an embodiment of the invention, the pitch system further comprises a drive member cooperating with the inner or outer set of rings connected to the blades for driving the blades in rotation relative to the hub.
According to another aspect of the embodiments of the present invention, there is provided a pitch bearing assembly for a wind turbine generator system, for connecting a hub and a blade, the pitch bearing assembly for a wind turbine generator system including: a first bearing including a first inner race and a first outer race; the second bearing is mutually laminated with the first bearing in the axial direction of the first bearing and comprises a second inner ring and a second outer ring, the first inner ring and the second inner ring are mutually connected to form an inner ring group, and the first outer ring and the second outer ring are mutually connected to form an outer ring group; one of the first bearing and the second bearing is a column bearing, the other bearing can bear axial load and radial load, one of the inner ring group and the outer ring group can be connected with the hub, and the other bearing can be connected with the opposite blade.
According to the wind generating set and the variable pitch bearing assembly thereof provided by the embodiment of the invention, the wind generating set comprises an impeller and a variable pitch system, the impeller comprises a hub and more than two blades connected with the hub, the variable pitch system comprises the variable pitch bearing assembly, the variable pitch bearing assembly comprises a first bearing and a second bearing, a first inner ring of the first bearing and a second inner ring of the second bearing are connected to form an inner ring group, a first outer ring of the first bearing and a second outer ring of the second bearing are connected to form an outer ring group, one of the inner ring group and the outer ring group is connected with the hub, the other one of the inner ring group and the outer ring group is connected with the blades, one of the first bearing and the second bearing is a ball bearing, and the other one of the first bearing and the second bearing is capable of bearing axial load and radial load, namely, one of the first bearing and the second bearing of the variable pitch bearing assembly can bear axial load and can bear radial load, the radial load is not increased when the axial bearing capacity of the variable pitch bearing assembly is improved, the stress of each bearing ring of the variable pitch bearing assembly is reduced, the failure of the variable pitch bearing assembly is avoided, and the falling accident of the blade is avoided, so that the wind generating set is low in cost and has higher safety performance.
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 a schematic view of the overall structure of a wind turbine generator system according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a pitch bearing assembly according to an embodiment of the invention;
FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;
FIG. 4 is a partial cross-sectional view of a pitch bearing assembly in connection with a hub and blades according to an embodiment of the present invention.
100-a wind generating set; x-axial direction; y-circumferential direction;
10-an impeller; 11-a hub; 111-a second flange hole; 12-a blade; 121-a first flange hole;
20-a pitch bearing assembly; 21-a first bearing; 211-a first inner collar; 211 a-first via; 212-a first outer ring; 212 a-third via; 22-a second bearing; 221-a second inner ring; 221 a-second via; 222-a second outer race; 222 a-a fourth via;
30-a first connector;
40-a second connector;
50-a nacelle;
and 60-tower drum.
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 shown in the drawings and is not intended to limit the specific structure of the wind turbine generator system and pitch bearing assembly of the present invention. 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 invention, a wind park and a pitch bearing assembly according to an embodiment of the invention will be described in detail below with reference to fig. 1 to 4.
Referring to fig. 1 to 4 together, fig. 1 shows an overall structural schematic view of a wind generating set 100 according to an embodiment of the present invention, fig. 2 shows a structural schematic view of a pitch bearing assembly 20 according to an embodiment of the present invention, fig. 3 shows a sectional view along a-a direction in fig. 2, and fig. 4 shows a partial sectional view of a connection of the pitch bearing assembly 20 with a hub 11 and a blade 12 according to an embodiment of the present invention.
The embodiment of the invention provides a wind generating set 100, where the wind generating set 100 may include a tower 60, a nacelle 50, a generator (not shown), an impeller 10, and a pitch system, the nacelle 50 is disposed at a top end of the tower 60, the generator is disposed in the nacelle 50, may be located inside the nacelle 50, and may also be located outside the nacelle 50, the impeller 10 includes a hub 11 and two or more blades 12 respectively connected to the hub 11, and the pitch system includes a pitch bearing assembly 20.
The pitch bearing assembly 20 comprises a first bearing 21 and a second bearing 22 stacked on the first bearing 21 in the axial direction X of the first bearing 21, one of the first bearing 21 and the second bearing 22 is a cylindrical bearing, the other one of the first bearing 21 and the second bearing 22 can bear axial load and radial load, the first bearing 21 comprises a first inner ring 211 and a first outer ring 212, the second bearing 22 comprises a second inner ring 221 and a second outer ring 222, the first inner ring 211 and the second inner ring 221 are connected with each other to form an inner ring group, the first outer ring 212 and the second outer ring 222 are connected with each other to form an outer ring group, at least one blade 12 is connected with the hub 11 through the pitch bearing assembly 20, one of the inner ring group and the outer ring group is connected with the hub 11, and the other one is connected with the blade 12 opposite to the inner ring group.
According to the wind generating set 100 provided by the embodiment of the invention, one of the first bearing 21 and the second bearing 22 of the variable pitch bearing assembly 20 is a column bearing, the other one can bear axial load and radial load, the column bearing can bear the axial load, the other bearing can bear the axial load and can bear the radial load, so that the radial load is not increased while the axial bearing capacity of the variable pitch bearing assembly 20 is improved, the stress of each bearing ring of the variable pitch bearing assembly 20 is reduced, the variable pitch bearing assembly 20 is prevented from failing, the blade 12 is prevented from falling, and the wind generating set 100 is low in cost and has higher safety performance.
In some alternative examples, the hub 11 may be provided with three blade mounting holes, and accordingly, the number of the blades 12 may be three, and only one blade 12 of the three blades 12 may be connected to the hub 11 through the pitch bearing assembly 20 according to the embodiment of the present invention, or two blades 12 or each blade 12 may be connected to the hub 11 through the pitch bearing assembly 20, so as to better ensure the safety of the wind turbine generator system 100. Of course, limiting the impeller 10 to include three blades 12 is only an optional way, and in some other examples, the number of the blades 12 included in the impeller 10 may also be two, four or even more, and may be specifically set according to the power generation requirement of the wind turbine generator system 100.
As an alternative embodiment, the first bearing 21 is a cylindrical bearing and is arranged close to the hub 11, and the second bearing 22 is a ball bearing or a tapered roller bearing and is arranged close to the blade 12. When the wind generating set 100 is in service, the axial load in the pitch system is far greater than the radial load, the column bearing has better axial bearing capacity than a ball bearing or a tapered roller bearing, and a row of rollers close to the side of the hub 11 is subjected to large stress, so that the first bearing 21 is defined as the column bearing and arranged close to the hub 11, and the bearing capacity of the pitch bearing assembly 20 on the load in the pitch system can be further optimized.
In specific implementation, the first bearing 21 may be a single-row cylindrical roller bearing, the second bearing 22 may be a single-row four-point contact type ball bearing, and the axis of the cylindrical roller of the single-row cylindrical roller bearing is perpendicular to the axis of the first bearing 21 where the cylindrical roller is located, and can only bear an axial load. The single-row four-point contact type ball shaft can bear the axial load and the radial load at the same time, and under the normal condition, the bearing capacity of the axial load and the bearing capacity of the radial load are the same, so that the cost can be reduced on the basis of meeting the requirements of connection between the blade 12 and the hub 11 and the pitch variation.
In some optional embodiments, the first inner ring 211 is provided with more than two first through holes 211a which are arranged at intervals along the circumferential direction Y of the first bearing 21 and extend along the axial direction X of the first bearing 21, the second inner ring 221 is provided with at least more than two second through holes 221a which are arranged in one-to-one correspondence to the first through holes 211a, the first through holes 211a and the second through holes 221a which correspond to each other are provided with first connecting pieces 30, and the first inner ring 211, the second inner ring 221 and one of the hub 11 and the blade 12 are connected with each other through the first connecting pieces 30.
In a specific implementation, in order to ensure the connection strength, the number of the first through holes 211a is multiple and is uniformly arranged on the first inner ring 211, and the number of the second through holes 221a is the same as the number of the first through holes 211a and is arranged in a one-to-one correspondence manner. In an optional example, an inner ring group composed of the first inner ring 211 and the second inner ring 221 is connected with the blade 12, in order to better meet the connection requirement, a plurality of first flange holes 121 are formed in the blade 12, the first flange holes 121 in the blade 12 are also arranged in one-to-one correspondence to the first through holes 211a, the first connecting member 30 may adopt fasteners such as bolts, and the first inner ring 211, the second inner ring 221 and the blade 12 are connected with each other through the first connecting member 30, and the length of the first connecting member 30 extending into the blade 12 is not limited by a specific numerical value as long as the connection strength between the pitch bearing assembly 20 and the blade 12 can be met.
Similarly, the first outer ring 212 of the pitch bearing assembly 20 provided in the embodiment of the present invention is provided with two or more third through holes 212a that are arranged at intervals along the circumferential direction Y of the first bearing 21 and extend along the axial direction X, the second outer ring 222 is provided with at least two or more fourth through holes 222a that are arranged in one-to-one correspondence with the third through holes 212a, the second connecting members 40 are arranged in the corresponding third through holes 212a and the fourth through holes 222a, the first outer ring 212, the second outer ring 222, and the hub 11 are connected to each other through the second connecting members 40, and the depth of the second connecting members 40 extending into the hub 11 is not limited by a specific numerical value, as long as the connection requirement between the pitch bearing assembly 20 and the hub 11 can be satisfied.
In specific implementation, the number of the third through holes 212a is multiple and the third through holes 212a are uniformly arranged on the first outer ring 212, the number of the fourth through holes 222a is the same as the number of the third through holes 212a and the third through holes are arranged in a one-to-one correspondence manner, in an optional example, an outer ring group formed by the first outer ring 212 and the second outer ring 222 is connected with the hub 11, in order to better meet the connection requirement, a plurality of second flange holes 111 are also arranged on a side wall of the blade 12 mounting hole surrounded by the hub 11, and the second connecting members 40 are also arranged on the side wall of the corresponding blade 12 mounting hole, the second flange holes 111 and the third through holes 212a are the same in number and the one-to-one correspondence manner, and the first outer ring 212, the second outer ring 222 and the hub 11 are connected with each other through the second connecting members 40.
Through the arrangement, the requirements of connection between the blade 12 and the hub 11 and blade 12 pitch variation can be better met, meanwhile, the first bearing 21 and the second bearing 22 are simultaneously connected through the first connecting piece 30 and the second connecting piece 40, the pre-tightening requirements between the first bearing 21 and the second bearing 22 can be met, secondary pre-tightening is not required for parts such as a bearing seat or a tightening nut, the first inner ring 211 and the second inner ring 221 of the inner ring group can be ensured to simultaneously rotate, and the first outer ring 212 and the second outer ring 222 of the outer ring group can simultaneously rotate.
The above embodiments are described by taking an example that the inner ring set is connected with the blades 12, and the outer ring set is connected with the hub 11, it is understood that this manner is only an alternative embodiment, and in some other examples, the inner ring set may be connected with the hub 11, and the outer ring set is connected with the blades 12, which can also meet the pitch requirement of the blades 12.
In order to better satisfy the pitch requirement of the blades 12, as an alternative implementation, the pitch system of the wind turbine generator system 100 of the embodiment of the present invention further includes a driving component, which is matched with the inner ring set or the outer ring set connected to the blades 12 to drive the blades 12 to rotate relative to the hub 11. The driving component may adopt different embodiments, and optionally, a structural form of a driving motor and a toothed belt may be adopted, the driving motor is connected with the inner ring set or the outer ring set through the toothed belt, the driving motor drives the toothed belt to move, the inner ring set or the outer ring set is driven to rotate through the toothed belt, and then the corresponding blade 12 is driven to rotate, so as to realize pitch control. Of course, the driving component is not limited to the above embodiment, and in some other examples, the driving component may also be in the form of a hydraulic cylinder or the like, and the pitch requirement of the blade 12 can also be achieved by a hydraulic driving method.
In the pitch bearing assembly 20 of each of the above embodiments, the radial dimensions of the first inner ring 211 and the first outer ring 212 of the first bearing 21 and the radial dimensions of the second inner ring 221 and the second outer ring 222 of the second bearing 22 may be set according to the self-bearing requirement, and the pitch bearing assembly 20 may be designed according to the economic optimization under the condition that the connection requirements with the first connecting member 30, the second connecting member 40, the hub 11 and the corresponding blades 12 are met, so as to reduce the cost of the pitch bearing assembly 20.
As an alternative, the inner diameter of first inner ring 211 of pitch bearing assembly 20 according to the above embodiments of the present invention is the same as the inner diameter of second inner ring 221, and optionally, the outer diameter of first inner ring 211 is the same as the outer diameter of second inner ring 221, that is, the radial dimensions of first inner ring 211 and second inner ring 221 may be the same, so as to facilitate the connection between first inner ring 211 and second inner ring 221. In some alternative examples, the inner diameter of first outer ring 212 is the same as the inner diameter of second outer ring 222, and optionally, the outer diameter of first outer ring 212 is the same as the outer diameter of second outer ring 222, i.e., the radial dimensions of first outer ring 212 and second outer ring 222 may be the same.
Through the arrangement, the installation of the variable pitch bearing assembly 20 and the connection between the variable pitch bearing assembly and the hub 11 and the corresponding blade 12 can be facilitated, the connection between the variable pitch bearing assembly and the driving component can be facilitated, and the driving component can drive the blade 12 to realize variable pitch.
To sum up, according to the pitch bearing assembly 20 and the wind turbine generator set 100 provided by the embodiment of the present invention, since the pitch bearing assembly 20 includes the first bearing 21 and the second bearing 22, the first inner ring 211 of the first bearing 21 and the second inner ring 221 of the second bearing 22 are connected to form an inner ring set, the first outer ring 212 of the first bearing 21 and the second outer ring 222 of the second bearing 22 are connected to form an outer ring set, one of the inner ring set and the outer ring set is connected to the hub 11, the other is connected to the blade 12, since one of the first bearing 21 and the second bearing 22 is a ball bearing, and the other is a bearing capable of receiving an axial load and a radial load, the bearing capacity of the variable pitch bearing assembly 20 in the axial direction X is improved, meanwhile, the radial load is not increased, the stress of each bearing ring of the variable pitch bearing assembly 20 is reduced, the failure of the variable pitch bearing assembly 20 is avoided, the falling accidents of the blades 12 are avoided, and the wind generating set 100 is low in cost and has higher safety performance.
One of the first bearing 21 and the second bearing 22 of the variable pitch bearing assembly 20 adopts a ball bearing or a tapered roller bearing, and the other one adopts a cylindrical bearing, so that the problem that the service life of the commonly used double-row ball bearing structure in the wind generating set 100 is unequal in design is solved. Because the load born by the roller close to the hub 11 side is greater than that of the roller close to the blade 12 side when the wind generating set 100 is in service, in order to ensure the reliability of the bearing, the double-row ball bearing is usually designed according to the bearing capacity of the roller close to the hub 11 side, so that the two rows of bearings have different service lives in practical application, and the double-row ball bearing has the defects of high bearing height, heavy weight and high cost.
In the wind generating set 100 provided by the embodiment of the invention, the variable pitch bearing assembly 20 can be respectively designed with the first bearing 21 and the second bearing 22 according to the bearing characteristics, so that the service lives of the first bearing 21 and the second bearing 22 are approximate, the variable pitch bearing cost of the wind generating set 100 is reduced, and the weight of the variable pitch bearing of the wind generating set 100 is reduced. When the axial bearing capacity of the variable pitch bearing assembly 20 needs to be increased, the requirement on the axial bearing capacity can be met by changing the model of the column bearing and the like, the radial bearing capacity cannot be influenced, and the service life of the variable pitch bearing assembly 20 can be kept all the time.
Meanwhile, the first bearing 21 and the second bearing 22 of the variable pitch bearing assembly 20 are of a split structure, and can be connected in a detachable mode, so that after one of the first bearing 21 and the second bearing 22 fails due to unexpected faults and the like, only the failed bearing is replaced, and the other of the first bearing 21 and the second bearing 22 can still be continuously used, thereby reducing the maintenance cost of the wind generating set 100.
Furthermore, the variable pitch bearing assembly 20 adopts a combination form of the first bearing 21 and the second bearing 22, so that the characteristics of respective rollers can be fully considered, the arrangement of a lubricating oil selecting structure, a lubricating oil path and a sealing structure is more facilitated, the variable pitch of the blade 12 is more facilitated, and the variable pitch bearing assembly is easy to popularize and use.
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 (10)
1. A wind power plant (100), comprising:
an impeller (10) including a hub (11) and two or more blades (12) connected to the hub (11), respectively;
a pitch system comprises a pitch bearing assembly (20), wherein the pitch bearing assembly (20) comprises a first bearing (21) and a second bearing (22) which is arranged in an axial direction (X) of the first bearing (21) and is stacked on the first bearing (21), the first bearing (21) and the second bearing (22) of the pitch bearing assembly (20) are separately arranged, one of the first bearing (21) and the second bearing (22) is a column bearing and is arranged close to a hub (11), the other one of the first bearing (21) and the second bearing (22) can bear axial load and radial load and is arranged close to a blade (12), the first bearing (21) comprises a first inner ring (211) and a first outer ring (212), the second bearing (22) comprises a second inner ring (221) and a second outer ring (222), and the first inner ring (211) and the second inner ring (221) are detachably connected with each other to form an inner ring group, the first outer ring (212) and the second outer ring (222) are detachably connected with each other to form an outer ring group;
wherein at least one of the blades (12) is connected to the hub (11) by the pitch bearing assembly (20), one of the inner and outer ring sets being connected to the hub (11) and the other being connected to the blade (12) opposite thereto.
2. Wind park (100) according to claim 1, wherein the first bearing (21) is a cylindrical bearing and is arranged adjacent to the hub (11) and the second bearing (22) is a ball bearing or a tapered roller bearing and is arranged adjacent to the blade (12).
3. Wind park (100) according to claim 2, wherein the first bearing (21) is a single row cylindrical roller bearing and the second bearing (22) is a single row four point contact ball bearing.
4. A wind power generation unit (100) according to any of claims 1 to 3, wherein the first inner ring (211) is provided with two or more first through holes (211a) spaced apart in the circumferential direction (Y) of the first bearing (21) and extending in the axial direction (X), the second inner ring (221) is provided with at least two or more second through holes (221a) corresponding to the first through holes (211a) one by one, first connecting members (30) are provided in the corresponding first through holes (211a) and second through holes (221a), and the hub (11) and one of the blades (12), the first inner ring (211) and the second inner ring (221) are connected to each other by the first connecting members (30).
5. A wind power generation assembly (100) according to any of claims 1 to 3, wherein the first outer ring (212) is provided with more than two third through holes (212a) spaced apart along the circumferential direction (Y) of the first bearing (21) and extending along the axial direction (X), the second outer ring (222) is provided with at least more than two fourth through holes (222a) corresponding to the third through holes (212a), second connecting members (40) are provided in the corresponding third through holes (212a) and fourth through holes (222a), and the hub (11) and one of the blades (12), the first outer ring (212) and the second outer ring (222) are connected to each other through the second connecting members (40).
6. Wind park (100) according to any of claims 1 to 3, wherein the inner diameter of the first inner ring (211) is the same as the inner diameter of the second inner ring (221) and/or the outer diameter of the first inner ring (211) is the same as the outer diameter of the second inner ring (221).
7. Wind park according to any of claims 1 to 3, wherein the inner diameter of the first outer ring (212) is the same as the inner diameter of the second outer ring (222) and/or the outer diameter of the first outer ring (212) is the same as the outer diameter of the second outer ring (222).
8. Wind park according to any of claims 1 to 3, wherein each blade (12) is connected to the hub (11) by means of the pitch bearing assembly (20), respectively.
9. Wind park according to any of claims 1 to 3, wherein the pitch system further comprises a drive member cooperating with the inner or outer set of blades (12) for driving the blades (12) in rotation with respect to the hub (11).
10. A pitch bearing assembly (20) for a wind park (100) for connecting a hub (11) and a blade (12), characterized in that the pitch bearing assembly (20) for a wind park (100) comprises:
a first bearing (21) comprising a first inner ring (211) and a first outer ring (212);
a second bearing (22) stacked on the first bearing (21) in an axial direction (X) of the first bearing (21), the second bearing (22) including a second inner ring (221) and a second outer ring (222), the first inner ring (211) and the second inner ring (221) being detachably connected to each other to form an inner ring set, and the first outer ring (212) and the second outer ring (222) being detachably connected to each other to form an outer ring set;
wherein the first bearing (21) and the second bearing (22) of the pitch bearing assembly (20) are arranged separately, one of the first bearing (21) and the second bearing (22) is a cylindrical bearing and is arranged close to the hub (11), the other one of the first bearing (21) and the second bearing (22) is capable of bearing axial load and radial load and is arranged close to the blade (12), one of the inner ring set and the outer ring set is capable of being connected with the hub (11), and the other one of the inner ring set and the outer ring set is capable of being connected with the blade (12) opposite to the inner ring set.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811544744.4A CN111322197B (en) | 2018-12-17 | 2018-12-17 | Wind generating set and variable-pitch bearing assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811544744.4A CN111322197B (en) | 2018-12-17 | 2018-12-17 | Wind generating set and variable-pitch bearing assembly |
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| CN111322197A CN111322197A (en) | 2020-06-23 |
| CN111322197B true CN111322197B (en) | 2021-10-08 |
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| CN111946804B (en) * | 2020-08-29 | 2023-08-18 | 湘电风能有限公司 | Variable pitch gear jet lubrication system of wind generating set and control method thereof |
| CN114017267B (en) * | 2021-11-16 | 2024-06-11 | 西安热工研究院有限公司 | Wind generating set variable pitch bearing fault diagnosis method and system |
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| CN101568735A (en) * | 2006-12-18 | 2009-10-28 | 维斯塔斯风力系统有限公司 | A bearing and method for transferring forces through a bearing of a wind turbine |
| CN101709742A (en) * | 2009-09-01 | 2010-05-19 | 常州光洋轴承有限公司 | Combined bearing for main shafts of direct-drive wind generating sets |
| CN206972449U (en) * | 2017-05-10 | 2018-02-06 | 东方电气风电有限公司 | Increase Wind turbines pitch variable bearings and the reinforcement flange of hub side connecting bolt intensity |
| CN108374835A (en) * | 2018-04-25 | 2018-08-07 | 成都天马铁路轴承有限公司 | Wind-powered electricity generation three-row cylinder roller pitch variable bearings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005026141B4 (en) * | 2005-06-06 | 2019-07-25 | Imo Momentenlager Gmbh | Wind turbine with a bearing unit for an elongated rotor blade |
| FR2973087B1 (en) * | 2011-03-25 | 2014-04-18 | Defontaine | BEARING HAS THREE ROWS AND MORE ROLLING BODIES |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101568735A (en) * | 2006-12-18 | 2009-10-28 | 维斯塔斯风力系统有限公司 | A bearing and method for transferring forces through a bearing of a wind turbine |
| CN101709742A (en) * | 2009-09-01 | 2010-05-19 | 常州光洋轴承有限公司 | Combined bearing for main shafts of direct-drive wind generating sets |
| CN206972449U (en) * | 2017-05-10 | 2018-02-06 | 东方电气风电有限公司 | Increase Wind turbines pitch variable bearings and the reinforcement flange of hub side connecting bolt intensity |
| CN108374835A (en) * | 2018-04-25 | 2018-08-07 | 成都天马铁路轴承有限公司 | Wind-powered electricity generation three-row cylinder roller pitch variable bearings |
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