CN109555645B - Tensioning drives, pitch systems and wind turbines - Google Patents
Tensioning drives, pitch systems and wind turbines Download PDFInfo
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- CN109555645B CN109555645B CN201710889667.5A CN201710889667A CN109555645B CN 109555645 B CN109555645 B CN 109555645B CN 201710889667 A CN201710889667 A CN 201710889667A CN 109555645 B CN109555645 B CN 109555645B
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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
- F03D15/00—Transmission of mechanical power
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes or chains
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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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Abstract
本发明提供一种张紧传动装置、变桨系统以及风力发电机组。张紧传动装置通过牵引部件与第二旋转部件配合传动，张紧传动装置包括：固定基座；第一旋转部件，枢转地连接至固定基座；张紧轮，位于第一旋转部件和第二旋转部件之间的牵引部件的外侧，并且张紧轮能够在牵引部件的推力作用下沿预定轨迹摆动；弹性调节部件，能够与张紧轮配合，使张紧轮由牵引部件外侧向牵引部件内侧压紧牵引部件，并制限张紧轮的摆动幅度。因此，能够实现能够改善牵引部件在工作中的受力环境，避免牵引部件局部受力集中，限制牵引部件的包角范围，避免牵引部件出现跳齿或者局部断裂现象，提高张紧传动装置的可靠性中的一个或多个目的。
The invention provides a tensioning transmission device, a pitch system and a wind power generator set. The tensioning transmission device cooperates with the second rotating part to drive through the traction part, and the tensioning transmission device comprises: a fixed base; a first rotating part, pivotally connected to the fixed base; a tensioning wheel, located between the first rotating part and the first rotating part The outer side of the traction member between the two rotating members, and the tensioning wheel can swing along a predetermined track under the thrust of the traction member; the elastic adjustment member can cooperate with the tensioning wheel, so that the tensioning wheel is moved from the outer side of the traction member to the traction member. The inner side compresses the traction parts and limits the swing of the tensioner pulley. Therefore, it is possible to improve the stress environment of the traction components during operation, avoid the local force concentration of the traction components, limit the wrap angle range of the traction components, avoid the phenomenon of tooth skipping or partial breakage of the traction components, and improve the reliability of the tensioning transmission device. one or more purposes of sexuality.
Description
Technical Field
The invention relates to the technical field of mechanical transmission, in particular to a tensioning transmission device, a variable pitch system and a wind generating set.
Background
As an important link in power transmission, the service life and the use reliability of the transmission device are particularly important. However, in general, in order to ensure that the traction member can be sufficiently wound around the rotating member, it is necessary to apply tension to the traction member by a tensioning device.
In a belt drive, for example, to ensure that the belt is wound around the two drive pulleys sufficiently, it is necessary to apply tension to the belt by means of a tensioner, thereby ensuring that the belt has sufficient tension at all times during operation, and avoiding any slippage of the belt. However, in a specific working process, the belts on two sides of the driving wheel are often subjected to different tensile forces, so that a phenomenon of local stress concentration occurs on the belt part on one side of the driving wheel, and once the phenomenon of local stress concentration occurs on the belts, the problem of breakage of the belts possibly occurs, and further the failure of the transmission device is caused.
Especially in the field of wind power generation, the reliability of the traction components (e.g. toothed belts) is of more critical importance in the pitch system of the blades. Moreover, in the specific implementation process of the pitch system, after the traction component is installed on the rotating component, an initial pre-tightening force is usually applied to the traction component through the pre-tightening device in a certain tension range. After the traction part is pre-tightened, internal stress can be generated in the structure of the traction part, and once two edges of the traction part are subjected to unbalanced tension in the working process, the two edges are likely to break, so that the transmission device fails. However, in the existing scheme, the pitch control driving system can only meet the wrap angle requirement of the traction part, and cannot adjust the problem of local stress concentration of the traction part, so that the problem of tooth skipping or local fracture of the traction part is easily caused.
Therefore, a new tensioning transmission device, a pitch system and a wind generating set are needed.
Disclosure of Invention
According to the embodiment of the invention, one or more purposes of improving the stress environment of the traction part in the working process, avoiding the phenomenon that the traction part has tooth jumping or local fracture due to the fact that the local stress of the traction part is concentrated to cause the failure of the traction part, limiting the wrap angle range of the traction part and improving the reliability of the tension transmission device are achieved.
According to an aspect of an embodiment of the present invention, there is provided a tension transmission device that cooperatively transmits with a second rotation member through a traction member, the tension transmission device including: a fixed base; a first rotating member pivotally connected to the fixed base; a tension pulley that is located outside the traction member between the first rotating member and the second rotating member, and that is swingable along a predetermined trajectory by a thrust of the traction member; and an elastic adjusting member which can be matched with the tension pulley, so that the tension pulley presses the traction member from the outer side of the traction member to the inner side of the traction member, and the swing amplitude of the tension pulley is limited.
According to an aspect of an embodiment of the present invention, the fixing base includes: a fixed portion fixed to the external support structure by a connector; and an extension portion protrudingly provided on the fixed portion and having a first receiving space receiving the first rotating member.
According to an aspect of an embodiment of the present invention, the tension transmission device further includes a tension pulley holding member that connects the tension pulleys and defines the predetermined trajectory as an arc trajectory.
According to an aspect of an embodiment of the present invention, the tension pulley holding member is attached to the fixed base.
According to an aspect of an embodiment of the present invention, a tension pulley holding member includes: a connection part rotatably connected to the fixed base; and a support portion connected to the connection portion and the tension wheel and rotated around the rotation axis of the first rotation member by the connection portion to define the predetermined trajectory as an arc trajectory centered on the rotation axis of the first rotation member.
According to an aspect of the embodiment of the present invention, the supporting portion includes a second accommodating space communicating with the first rotating member, and the tension pulley is supported in the second accommodating space so as to form a passing space through which the traction member can pass between the first rotating member and the tension pulley.
According to an aspect of an embodiment of the present invention, the tensioner holding member includes an arc-shaped guide rail defining the predetermined trajectory as an arc-shaped trajectory centered on a rotation axis of the first rotating member, the tensioner being slidably coupled to the arc-shaped guide rail.
According to an aspect of an embodiment of the present invention, the tension transmission device further includes a limiting member cooperating with the tension wheel holding member to limit a maximum swing amplitude of the tension wheel.
According to one aspect of an embodiment of the invention, the tensioning drive comprises a tensioning wheel.
According to an aspect of an embodiment of the invention, the elastic adjustment member is connected between the tension pulley and the first fixing structure.
According to an aspect of the embodiment of the present invention, the tension transmission device includes two tension pulleys, the two tension pulleys are respectively located between the first rotating member and the second rotating member, and the two tension pulleys can be simultaneously pressed against the traction member from the outer side of the traction member by the elastic adjustment member and can swing in the same direction along a predetermined trajectory.
According to one aspect of the embodiment of the invention, the elastic adjusting parts are respectively hinged with two tension wheels; or the elastic adjusting parts are respectively hinged between the two tensioning wheels and the corresponding second fixing structures.
According to an aspect of an embodiment of the invention, the elastic adjustment member comprises an elastic damper or a spring.
According to another aspect of the embodiments of the present invention, there is also provided a pitch system for driving a blade of a wind turbine generator system to pitch, the blade being rotatably connected to a hub of the wind turbine generator system by a pitch bearing, the pitch system including: a drive motor; in the above-mentioned tensioning transmission device, the first rotating member is connected to the driving motor; the second rotating part is connected with the blade root; and the traction component surrounds the first rotating component and the second rotating component and is in matched transmission with the first rotating component and the second rotating component respectively.
According to another aspect of an embodiment of the invention, the fixed base is connected to the hub.
According to another aspect of an embodiment of the invention, the traction means is a toothed belt.
According to another aspect of the embodiment of the invention, the second rotating part is an outer ring of a pitch bearing connected with the root of the blade, and the traction part is matched with the outer ring to rotate.
According to another aspect of the embodiment of the invention, the second rotating component is an inner ring of the pitch bearing connected with the root of the blade, the inner ring comprises an annular extension protruding from an outer ring of the pitch bearing along the axial direction of the pitch bearing, and the traction component is matched with the inner ring to rotate through the annular extension.
According to another aspect of the embodiment of the invention, the second rotating member is an annular transition connecting section connected with the root of the blade, and the traction member is matched with the blade to rotate through the transition connecting section.
According to another aspect of an embodiment of the invention, the transition piece is of unitary construction with the blade.
According to another aspect of the embodiment of the invention, the outer periphery of the transition connecting section is convexly provided with an annular supporting surface along the radial direction, and the traction part is matched with the blade to rotate through the supporting surface.
According to a further aspect of the embodiment of the invention, a wind generating set is further provided, which comprises the variable pitch system.
In summary, the tension transmission device, the pitch control system and the wind generating set of the embodiment of the invention adopt the traction component to surround the first rotating component and the second rotating component and to be matched with the first rotating component and the second rotating component for transmission respectively, wherein one of the first rotating component and the second rotating component is a driving wheel connected with the driving mechanism, and the other one is a driven wheel connected with the actuating mechanism. The first rotating member is rotatably supported by the fixed base. And the tension pulley is supported outside the traction member between the first rotating member and the second rotating member, and the tension pulley can swing along a predetermined trajectory by the thrust of the traction member. Through elasticity adjusting part and take-up pulley cooperation, can provide elastic tension for the take-up pulley, make the take-up pulley can be by the outside to the inboard traction part that compresses tightly of traction part, simultaneously, can restrict the swing range of take-up pulley through elasticity adjusting part, avoid traction part's cornerite to exceed reasonable scope. Therefore, the stress environment of the traction part in the working process can be improved, and the phenomenon that the traction part is subjected to local stress concentration to cause tooth jumping or local fracture is avoided, so that the traction part fails. Meanwhile, the wrap angle of the traction part is limited within a reasonable range, so that the reliability of the tensioning transmission device can be improved, and the variable-pitch precision of a variable-pitch system is ensured. In addition, the elasticity adjusting component can also relieve the impact load borne by the traction component through the elasticity adjusting function of the elasticity adjusting component, and the use reliability of the traction component is further improved.
Drawings
The invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which:
other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.
FIG. 1 is a schematic structural diagram of a tension drive according to one embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a tension drive according to another embodiment of the present invention;
FIG. 3 is a schematic illustration of one state of a particular example of a tension drive based on the principles of the structure shown in FIG. 2;
FIG. 4 is a schematic view of another state of the tensioning drive of FIG. 3;
FIG. 5 is a cross-sectional schematic view of the tensioning drive shown in FIG. 3 taken longitudinally;
FIG. 6 is a schematic view of a tension drive according to yet another embodiment of the present invention in use;
FIG. 7 is a schematic view of a tension drive according to yet another embodiment of the present invention in use;
FIG. 8 is a schematic view of a tension drive according to yet another embodiment of the present invention in use;
FIG. 9 is a cross-sectional structural schematic view of one particular example of a second rotating component cooperating with a traction component in a pitch system according to an embodiment of the invention;
FIG. 10 is a cross-sectional structural schematic view of another specific example of a second rotating component in cooperation with a traction component in a pitch system according to an embodiment of the invention;
FIG. 11 is a schematic cross-sectional view of yet another specific example of a second rotating component cooperating with a tractive component in a pitch system according to an embodiment of the invention.
Wherein:
100-a tensioning transmission; 101-a tensioning transmission; 102-a tensioning transmission; 103-tensioning transmission; 104-a tensioning transmission;
11-a fixed base; 111-a stationary portion; 111 a-mounting port; 112-an extension; 12-a first rotating member; 121-rolling bearings; 122-end cap; 14-a first tensioning wheel; 141-rolling bearings; 142-an end cap; 15-a second tensioning wheel; 16-a tensioner retaining member; 16 a-a first tensioning arm; 16 b-a second tensioning arm; 161-a linking moiety; 162-a support portion; 162 a-a first plate; 162 b-a second plate body; 162 c-a second accommodating space; 163-a plain bearing; 164-a guide slot; 17-an elastic adjustment member; 18-a stop member;
20-a transmission wheel;
30-a pitch bearing; 31-an outer ring; 32-inner ring; 321-an annular extension; 322-gear teeth;
40-a hub;
50-blade root; 501-gear teeth; 51-a transition junction; 511-ring connector; 512-a support surface; 513-gear teeth;
60-a traction member.
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. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The following description will be given with the directional terms shown in the drawings and will not be used to limit the specific structure of the pitch system and the tensioning transmission 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," "connected," and "connected" are to be construed broadly, e.g., as meaning 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.
The tensioning transmission device provided by the embodiment of the invention is connected between the driving mechanism and the actuating mechanism, the power of the driving mechanism is transmitted to the actuating mechanism to drive the actuating mechanism to work, and the tensioning force of the traction part and the formed wrap angle can be controlled within a reasonable range all the time when the tensioning transmission device works. The reliability of use of the tensioning drive can thus be increased and the service life of the traction means can be increased.
For a better understanding of the invention, a tensioning transmission and a pitch system according to an embodiment of the invention will be described below with reference to fig. 1 to 11.
Fig. 1 is a schematic structural view of a tension drive 100 according to one embodiment of the present invention. It should be noted that fig. 1 only schematically illustrates the principle of the tension transmission device 100, so that a part of the structure of the tension transmission device 100 is not shown, and fig. 1 illustrates the tension transmission device 100 in an initial state (i.e., an unstressed state) by the traction member 60 cooperating with the second rotating member (illustratively, the rotating wheel 20). As shown in fig. 1, in one embodiment, the tension drive 100 includes: the fixing base 11 (only the fixing fulcrum of the first rotating member 12 is illustrated in fig. 1, and therefore, the specific example in fig. 3 needs to be combined), the first rotating member 12, the tension pulley (i.e., the second tension pulley 15), and the elastic adjustment member 17. The traction component 60 surrounds the first rotating component 12 and the second rotating component, and is in matched transmission with the first rotating component 12 and the second rotating component respectively, wherein one of the first rotating component 12 and the second rotating component is a driving wheel and is connected with a driving mechanism; the other is a driven wheel connected with the actuating mechanism. The first rotating member 12 is rotatably supported by the fixed base 11. And the tension pulley is supported outside the traction member 60 between the first rotating member 12 and the second rotating member, and the tension pulley can swing along a predetermined trajectory by the thrust of the traction member. The elastic adjusting member 17 is engaged with the tension pulley, so that tension can be provided to the tension pulley, the tension pulley can press the traction member 60 from the outside of the traction member 60 to the inside of the traction member 60, and the elastic adjusting member 17 can limit the swing range of the tension pulley.
Therefore, when the first rotating member 12 is driven by the pulling member 60 and the second rotating member in a matching manner, the pulling member 60 receives different pulling forces on both sides of the first rotating member 12, and the tightness of both sides is inconsistent. That is, the pulling member 60 moves from the initial position (shown in fig. 1) to the stressed position (not shown), and therefore, the sides of the pulling member 60 on both sides of the first rotating member 12 are subjected to different pulling forces (for example, the left side of the pulling member 60 is subjected to a greater pulling force than the right side). At this time, the elastic adjusting member 17 provides tension to the tensioning wheel to limit the swing amplitude of the tensioning wheel in the direction away from the traction member 60 under the pushing force of the traction member 60, so that the tension applied to the tight side of the traction member 60 can be transmitted to the loose side (i.e. the tensioning wheel presses the right side of the traction member 60).
The force state of the traction means 60 can thus be adjusted during operation, so that the initial pretension required by the traction means 60 is reduced. Therefore, the stress environment of the traction component 60 in working can be improved, the phenomenon that the traction component 60 is subjected to tooth jumping or local breakage due to local stress concentration of the traction component 60 is avoided, and meanwhile, the wrap angle of the traction component 60 can be limited within a reasonable range through the elastic adjusting component 17, so that the reliability of the tensioning transmission device 100 is improved. In addition, the elasticity adjusting member 17 can also relieve the impact load applied to the traction member 60 by its elasticity adjusting action, thereby improving the reliability of use of the traction member 60.
FIG. 2 is a schematic structural diagram of a tension drive 101 according to another embodiment of the present invention; fig. 3 is a schematic diagram of a state of a specific example of the tension drive 101 based on the principle of the structure shown in fig. 2; FIG. 4 is a schematic view of another state of the tension drive 101 shown in FIG. 3; fig. 5 is a schematic sectional view of the tension drive 101 shown in fig. 3, taken along the longitudinal direction. It should be noted that fig. 3 to 5 are specific structural examples based on the structural principle in fig. 3.
The tension transmission device 101 in the present embodiment includes: the tension pulley device comprises a fixed base 11, a first rotating member 12, a first tension pulley 14, a second tension pulley 15, a tension pulley holding member 16 and an elastic adjusting member 17. The tensioning drive 100 shown in fig. 1 has only one tensioning wheel, namely the second tensioning wheel 15; in contrast, the tensioning drive 101 in fig. 2 to 5 has two tensioning wheels, namely a first tensioning wheel 14 and a second tensioning wheel 15. The following description will be made in detail by taking only the tension transmission 101 having two tension pulleys as an example, and the tension transmission 100 having only the second tension pulley 15 can be obtained by removing the first tension pulley 14 and the structure associated with the first tension pulley 14 from the structure of the tension transmission 101. For example, in the present embodiment, the traction member 60 may be a toothed belt, and the first rotating member 12 is a pulley having a shaft hole to be in transmission connection with an output shaft of a reducer connected with the driving motor through the shaft hole. The second rotating part is a transmission wheel 20 which can be connected with other actuating mechanisms.
According to a specific example of the present invention, the fixed base 11 includes a fixed portion 111 and an extension portion 112, wherein the fixed portion 111 may be fixed to an external support structure (not shown in the drawings) by a connector, and the extension portion 112 is protrudingly provided on the fixed portion 111 and may be used to receive the first rotating member 12. In the present embodiment, the fixing portion 111 is exemplarily a disk-shaped structure, and a mounting opening 111a is opened at a substantially central position of the disk-shaped structure, and a plurality of connection holes (i.e., constituting a flange connection edge, not shown in the figure) are provided at an edge of the fixing portion 111. And correspondingly, a flange connection edge matching the fixing portion 111 needs to be provided on the external support structure. Thus, the fixing portion 111 can be fitted outside the reduction gear connected to the drive motor along the mounting opening 111a, and the fixing base 11 can be fixed to the external support structure by using a fastener via the connecting hole provided in the fixing portion 111 and the flange hole on the flange connecting side of the external support structure. Of course, the embodiment of the present invention is not limited to the external support structure, and the external support structure may be any structure that can support the fixed base 11, rotatably support the first rotating member 12 through the fixed base 11, and enable the first rotating member 12 to cooperate with the traction member 60 to drive the transmission wheel 20.
In the present embodiment, the extension portion 112 is a sleeve-like structure protruding from the fixing portion 111, that is, the extension portion 112 has a first receiving space (not indicated in the figure) for receiving the first rotating member 12. The sleeve-like structure means that, in order to allow the traction member 60 to surround the first rotating member 12, the wall of the space in which the first rotating member 12 is located cannot be closed in the circumferential direction of the first rotating member 12, and a passing space through which the traction member 60 can pass is provided between the first rotating member 12 and the extension portion 112 in the circumferential direction. In an alternative embodiment, the fixing portion 111 and the extension portion 112 are of a unitary structure in order to satisfy the structural strength of the fixing base 11. The first rotating member 12 is rotatably disposed in the first accommodation space of the extension portion 112 by a rolling bearing 121 so that the first rotating member 12 can rotate about its rotation axis. It is understood that the first rotating member 12 may also be rotatably supported in the first accommodating space by a sliding bearing. After the first rotating member 12 is installed in the first accommodating space of the extending portion 112, the axial pressing force is provided to the first rotating member 12 and the rolling bearing 121 through the end cap 122.
Of course, the embodiment of the present invention is not limited with respect to the specific structure of the fixing portion 111 and the extension portion 112 of the fixing base 11. The fixed portion 111 may be made of other shaft seats or a frame structure, and the extending portion 112 may be other forms of bosses as long as the purpose of rotatably supporting the first rotating member 12 by the extending portion 112 is achieved.
In addition, based on the above structure and function of the fixing base 11, it is understood that in other exemplary embodiments, the fixing base 11 may be only formed of a plate-shaped or frame structure and may be fixed to the external support structure by a fastener. Of course, the first rotating member 12 may be a pulley having a rotating shaft, and in this case, the first rotating member 12 may be connected to the fixed base 11 formed of a plate-like or frame structure by the rotating shaft thereof in a rotatable manner.
With continued reference to fig. 3 to 5, according to an embodiment of the present invention, the tension transmission apparatus 101 further includes a tension pulley holding member 16 to define a predetermined trajectory as an arc trajectory by the tension pulley holding member 16, and the tension pulley holding member 16 is connected to the first tension pulley 14 and the second tension pulley 15, respectively, to support the first tension pulley 14 and the second tension pulley 15 on both sides of the traction member 60 between the first rotating member 12 and the transmission wheel 20, respectively, and to be capable of swinging about the same rotation axis.
In the present embodiment, exemplarily, since the tension transmission device 101 includes the first tension pulley 14 and the second tension pulley 15, correspondingly, the tension pulley holding member 16 has two tension arms, i.e., a first tension arm 16a and a second tension arm 16b, wherein one end of the first tension arm 16a is rotatably connected to the fixed base 11, and the other end rotatably supports the first tension pulley 14; and the second tensioning arm 16b has one end rotatably connected to the fixed base 11 and the other end rotatably supporting the second tensioning wheel 15. In order to simplify the structure of the tension transmission device 101 and the assembly process, the first tensioning arm 16a and the second tensioning arm 16b have the same structure, and the tension pulley holding member 16 will be described below by taking only the first tensioning arm 16a connected to the first tension pulley 14 as an example.
Specifically, the first tensioning arm 16a includes a connecting portion 161 and a support portion 162. The connecting portion 161 is connected to the extending portion 112 of the fixed base 11, and since the extending portion 112 is of a sleeve-like structure as mentioned in the above-mentioned embodiment, correspondingly, the connecting portion 161 is provided with a mounting opening (not indicated in the drawings) adapted to the extending portion 112. Thus, the connecting portion 161 can be rotatably enclosed outside the extending portion 112 through the mounting opening using a slide bearing 163 (as shown in fig. 5). Thereby, the connecting portion 161 can bring the supporting portion 162 connected thereto to rotate about the rotation axis of the first rotating member 12. That is, referring to the structure shown in fig. 4, the first tensioning arm 16a defines the predetermined trajectory as an arc-shaped trajectory centered on the rotation axis of the first rotating member 12. However, the rotation centers of the first tension arm 16a and the second tension arm 16b are not limited to coincide with the rotation axis center of the first rotating member 12.
The support portion 162 includes a first plate 162a and a second plate 162b arranged opposite and parallel to each other, a second accommodation space 162c is formed between the first plate 162a and the second plate 162b, and the second accommodation space 162c communicates with the first accommodation space provided in the extension portion 112 of the fixed base 11, that is, the second accommodation space 162c communicates with the first rotation member 12. Both ends in the axial direction of the first tension roller 14 are rotatably supported by the first plate 162a and the second plate 162b via rolling bearings 141, respectively. Illustratively, the rolling bearing 141 may also be replaced with a sliding bearing. After the second tension wheel 14 is disposed in the second accommodating space 162c, the axial pressing force can be provided to the second tension wheel 14 and the rolling bearing 141 through the end cap 142. A passing space for passing the traction member 60 (i.e., the toothed belt) can be formed between the first tension wheel 14 and the first rotating member 12 through the second accommodating space 162 c. The second tensioning arm 16b also has a second accommodating space 162c, and a passing space for passing the traction member 60 can be formed between the second tensioning wheel 15 and the first rotating member 12 through the second accommodating space 162c provided by the second tensioning arm 16 b.
Referring to the above-described configuration of the first tensioning arm 16a, the second tensioning arm 16b has the same structure as the first tensioning arm 16a except that the second tensioning arm 16b is mounted on the extension portion 112 of the fixed base 11 by a support portion (not indicated in the drawing) thereof in a symmetrical manner with the first tensioning arm 16a, and the connecting portion 161 of the second tensioning arm 16b is enclosed outside the connecting portion 161 of the first tensioning arm 16a (as shown in fig. 5). Therefore, the first tension pulley 14 and the second tension pulley 15 are symmetrically located on both sides of the first rotating member 12, so that a line connecting the first rotating member 12, the first tension pulley 14, and the second tension pulley 15 is configured as a triangle.
Thereby, the traction member 60 can pass through between the first tension pulley 14 and the first rotating member 12 and between the second tension pulley 15 and the first rotating member 12 via the first housing space and the second housing space 162c provided on the first tension arm 16a and the second tension arm 16b, respectively, and simultaneously around the outer peripheries of the first rotating member 12 and the transmission wheel 20. While the two tensioning wheels are located outside the traction means 60 and press the traction means 60 towards each other. In addition, when the tensioning drive 101 comprises only one tensioning wheel, the traction means 60 is pressed by one tensioning wheel from one side of the traction means 60.
In addition, in other embodiments, it is understood that the supporting portions 162 of the first tensioning arm 16a and the second tensioning arm 16b can also be formed by a frame structure, so as to form the second accommodating space 162c through the frame. Further, in other embodiments, the first tensioning arm 16a and the second tensioning arm 16b may be rotatably mounted on the fixed base 11 except for the extension portion 112, and at this time, the tensioning wheel holding member 16 defines the predetermined trajectory as an arc trajectory having the center of the connecting portion 161 thereof as the rotation center. Of course, the first tensioning arm 16a and the second tensioning arm 16b may be rotatably connected to a structure other than the fixed base 11, as long as it is possible to support the first tensioning wheel 14 and the second tensioning wheel 15 on both sides of the traction member 60 between the first rotating member 12 and the transmission wheel 20, respectively, and to swing the first tensioning wheel 14 and the second tensioning wheel 15 along a predetermined circular arc trajectory.
With continued reference to fig. 2 and 3, according to an exemplary embodiment of the present invention, the elastic adjustment member 17 is connected between the first tension pulley 14 and the second tension pulley 15 to cause the first tension pulley 14 and the second tension pulley 15 to form a mutually restricted tension between each other, so that the first tension pulley 14 and the second tension pulley 15 can simultaneously press the traction member 60 from the outer side of the traction member 60 toward each other and restrict the swing amplitude of the first tension pulley 14 and the second tension pulley 15.
In order to swing the first tension pulley 14 and the second tension pulley 15 along a predetermined arc trajectory, the elastic adjustment member 17 needs to be connected between the first tension pulley 14 and the second tension pulley 15. For example, the elastic adjustment member 17 may be connected to the corresponding first tension pulley 14 and second tension pulley 15 by using a universal joint or a fisheye bearing.
Specifically, the elastic adjustment member 17 may employ various connection devices that are variable in overall length and capable of restricting the amplitude of oscillation of the first tension pulley 14 and the second tension pulley 15 in the direction away from each other. For example, the elastic adjustment member 17 may be a spring. When the elastic adjustment member 17 is a spring, the spring may be hingedly connected to the first tensioning arm 16a and the second tensioning arm 16b, respectively, and a stretching range of the spring needs to be set. That is, after the spring is hinged to the first tensioning arm 16a and the second tensioning arm 16b, the first tensioning arm 16a and the second tensioning arm 16b are mutually constrained in tension by the spring, so as to limit the swing amplitude of the first tensioning wheel 14 and the second tensioning wheel 15, i.e., limit the wrap angle of the traction member 60.
The number of the elastic adjusting members 17 between the first tension pulley 14 and the second tension pulley 15 may be one as shown in fig. 2, or may be plural. Further, when a plurality of the elastic adjusting members 17 are provided between the first tension pulley 14 and the second tension pulley 15, the structures of the elastic adjusting members 17 may be different.
In the process of the first rotation element 12 being in cooperative transmission with the transmission wheel 20 via the traction element 60, as shown in fig. 2, when the first rotation element 12 starts to rotate in mesh with the traction element 60 under the driving of the driving mechanism, for example, when the first rotation element 12 rotates clockwise (as viewed in fig. 2), the transmission wheel 20 starts to rotate first due to the portion of the traction element 60 located at the left side of the first rotation element 12. That is, the portion of the pulling member 60 located on the left side of the first rotating member 12 is subjected to a greater pulling force than the portion of the pulling member 60 located on the right side of the first rotating member 12, and at this time, the pulling member 60 exhibits a tight side and a loose side on both sides of the first rotating member 12, respectively.
Therefore, the first tension pulley 14 pressed against the left side traction member 60 of the first rotation member 12 receives a clockwise lifting force, and the first tension pulley 14 pulls the second tension pulley 15 through the elastic adjustment member 17 to swing clockwise along the circular arc locus defined by the tension pulley holding member 16 together with the first tension pulley 14. Therefore, the slack side of the traction member 60 located on the right side of the first rotating member 12 is pressed clockwise by the swing of the second tension pulley 15, so that the tensile force applied to the slack side of the traction member 60 can be transmitted to the slack side. As a result, the first tension pulley 14 and the second tension pulley 15 are swung in the same direction by the tensile force of the elastic adjustment member 17, and the force state of the traction member 60 on both sides of the first rotation member 12 can be automatically adjusted. Thus, the requirement for the initial pre-tightening force of the traction component 60 can be reduced, so that the stress environment of the traction component 60 can be improved, the aims of delaying fatigue damage of the traction component 60, reducing the failure risk of the traction component 60 and prolonging the service life of the traction component 60 can be fulfilled, and the fracture caused by local stress concentration of the traction component 60 is avoided, so that the use reliability of the traction component 60 is improved.
Further, by providing the elastic adjustment member 17, the swing widths of the first tension pulley 14 and the second tension pulley 15 are regulated. It can be understood that, by adjusting the elastic range of the elastic adjusting component 17, the range of the included angle between the first tensioning arm 16a and the second tensioning arm 16b, that is, the range of the opening distance between the first tensioning wheel 14 and the second tensioning wheel 15, can be changed, and the purpose of adjusting the wrap angle range of the traction component 60 is achieved. In an alternative embodiment, for example, the wrap angle range of the traction member 60 may be preset to 150 ° to 180 °, and based on the wrap angle range of the traction member 60, the elasticity range of the elasticity adjusting member 17 may be correspondingly set. Therefore, the wrap angle of the traction member 60 can be controlled within a reasonable range all the time, and the phenomenon of tooth jumping caused by the over-small wrap angle between the traction member 60 and the first rotating member 12 is avoided.
Moreover, since the distance between the first tensioning wheel 14 and the second tensioning wheel 15 can be elastically adjusted, a basic pre-tensioning force can be always provided to the traction member 60 via the first tensioning wheel 14 and the second tensioning wheel 15 during the operation of the traction member 60 (for example, in a state where the traction member 60 is uniformly loaded), so that the reliability of the use of the traction member 60 can be improved. When the traction component 60 is affected by the alternating load, the impact load on the traction component 60 can be relieved through the elastic adjusting function of the elastic adjusting component 17, and the traction component 60 is prevented from being broken due to the impact load.
In an alternative embodiment, the elastic adjustment member 17 may also comprise an elastic damper, i.e. as shown in fig. 2, with both a spring and a hydraulic cylinder capable of providing a reaction force. It should be noted here that, as for the elastic adjustment component 17 including the hydraulic cylinder, it is known to those skilled in the art of hydraulic machinery how to control the hydraulic pressure in the hydraulic cylinder to make the hydraulic cylinder work, so that those skilled in the art can make the hydraulic cylinder achieve the function of buffer connection based on the technical solution disclosed in the present invention. For example, each hydraulic ram may be in communication with a hydraulic station, and the hydraulic master station may be connected to a controller, whereby the controller controls the hydraulic pressure output from the hydraulic station to control the pressure within the hydraulic ram to provide a reaction force to the first tensioning wheel 14 and the second tensioning wheel 15 while the overall length of the hydraulic ram changes. Therefore, when the traction member 60 is subjected to an alternating load, the dampers in the elastic adjustment member 17 can absorb the vibrations of the first tension pulley 14 and the second tension pulley 15, and the first tension pulley 14 and the second tension pulley 15 are prevented from frequently and excessively swinging to cause fatigue damage to the traction member 60.
As shown in fig. 4, in an alternative embodiment, in order to prevent the swing amplitude of the first tensioning wheel 14 and the second tensioning wheel 15 from being too large to effectively adjust the force applied to the traction member 60, a limiting member 18 may be further disposed in the tensioning transmission device 101. Illustratively, the stop member 18 is a stop, and the stop member 18 is disposed on the connecting portion 161 of the first tensioning arm 16a at a location proximate to a top edge of the connecting portion (not indicated in the figures) of the second tensioning arm 16 b. Since the connecting portion of the second tensioning arm 16b is fitted over the connecting portion 161 of the first tensioning arm 16a, the stopper member 18 can be engaged with the top edge of the connecting portion of the second tensioning arm 16b to limit the rotation angle of the first tensioning arm 16a and the second tensioning arm 16b relative to each other, thereby defining the minimum value of the wrap angle of the traction member 60, and thus, the transmission reliability of the traction member 60 can be ensured. Of course, the specific installation position and installation structure of the limiting member 18 in the embodiment of the present invention are not limited, and the limiting member may be installed along the movement path of the first tensioning arm 16a and the second tensioning arm 16b to limit the maximum swing width of the first tensioning wheel 14 and the second tensioning wheel 15.
In addition, in other embodiments, the number of the limiting members 18 may also be two, for example, two limiting members 18 are respectively disposed at the edge of the fixing portion 111 of the fixing base 11 shown in fig. 4 and are respectively located at the left side (in the viewing direction shown in fig. 4) of the first tensioning arm 16a and the right side (in the viewing direction shown in fig. 4) of the second tensioning arm 16 b. Therefore, the maximum swing amplitude of the first tensioning arm 16a and the second tensioning arm 16b is limited during the rotation of the first tensioning arm 16a and the second tensioning arm 16b through the two stop blocks, namely, the wrap angle of the traction component 60 is limited within a reasonable range, so that the reliability of the transmission of the traction component 60 is improved.
In addition, the present invention is not limited to the manner of disposing the elastic adjustment member 17, and in other embodiments, the elastic adjustment member 17 may not be connected between the first tension pulley 14 and the second tension pulley 15. FIG. 6 is a schematic structural diagram of a tension drive 102 according to yet another embodiment of the present invention; fig. 7 is a schematic structural diagram of a tension drive 103 according to yet another embodiment of the present invention. For ease of understanding, the same reference numerals are used for the same components in the embodiment shown in fig. 6 and 7 as in the tensioning drive 101 described above, and will not be repeated again for the components already described.
As shown in fig. 6, in an alternative embodiment, the tensioning actuator 102 may further include two elastic adjustment members 17, wherein one elastic adjustment member 17 is hingedly connected between the first tensioning arm 16a and the second fixed structure, and the other elastic adjustment member 17 is hingedly connected between the second tensioning arm 16b and the second fixed structure (the second fixed structure is not shown, and only the fixed ends of the two elastic adjustment members 17 are shown). And the two elastic adjustment members 17 are simultaneously attached to the sides of the first tensioning arm 16a and the second tensioning arm 16b that are away from each other (i.e., above the first tensioning arm 16a and the second tensioning arm 16b as shown in fig. 6). So as to provide thrust for the first tensioning wheel 14 and the second tensioning wheel 15 through the elastic adjusting part 17 during the swinging process of the first tensioning wheel 14 and the second tensioning wheel 15, thereby realizing the purpose of automatically adjusting the stress of the traction part 60 through the mutual matching of the first tensioning wheel 14 and the second tensioning wheel 15. That is, a part of the pre-tightening force is provided to the traction member 60 by the initial pressure of the elastic adjustment member 17; when the traction component 60 is stressed inconsistently on two sides of the first rotating component 12 to cause tight edge and loose edge, the elastic adjusting component 17 can elastically adjust the stress of the tight edge and the loose edge of the traction component 60, and the problem of local stress concentration of the traction component 60 is avoided. When the elastic adjusting member 17 is an elastic damper, it is also possible to cushion the impact load received by the traction member 60.
As shown in fig. 7, in the present embodiment, the tension transmission device 103 also includes two elastic adjustment members 17, and one of the elastic adjustment members 17 is hingedly connected between the first tension arm 16a and the second fixed structure, and the other elastic adjustment member 17 is hingedly connected between the second tension arm 16b and the second fixed structure, but is different from the tension transmission device 102 shown in fig. 6 in that the two elastic adjustment members 17 of the tension transmission device 103 are simultaneously connected on the sides of the first tension arm 16a and the second tension arm 16b close to each other (i.e., below the first tension arm 16a and the second tension arm 16b shown in fig. 6).
Of course, the embodiment of the present invention does not limit the specific form of the second fixing structure, and the second fixing structure may be the fixing base 11, a platform or a plate connected to the fixing base 11, or other structures capable of supporting besides the tensioning transmission device 102. In addition, the second fixing structure may be a member capable of simultaneously connecting the two elastic adjustment members 17, or may include members independent of each other provided respectively for the two elastic adjustment members 17.
The two elastic adjusting members 17 provided corresponding to the first tension pulley 14 and the second tension pulley 15 may be provided in different manners. According to the reference direction shown in fig. 6, for example, one of the elastic adjusting members 17 may be attached to the first tensioning arm 16a on the side away from the second tensioning arm 16b, and the other elastic adjusting member 17 may be attached to the second tensioning arm 16b on the side close to the first tensioning arm 16 a. In addition, when only one tension pulley is included in the tension pulley transmission device 101, the elastic adjustment member 17 may be disposed between the tension pulley and the first fixing structure, and the first fixing structure and the second fixing structure are disposed in the same manner, so that the description thereof is omitted.
Fig. 8 is a schematic diagram of the structure of a tension drive 104 according to yet another embodiment of the present invention. As shown in fig. 8, the same components in the present embodiment as those in the tension transmission 101 of the above embodiment are given the same reference numerals for the sake of easy understanding, and the structure that has been explained will not be described again. It should be noted, however, that only the principle structure of the tension drive 104 is illustrated in fig. 8, and therefore, some components of the tension drive 104 are not shown. The tension transmission device 104 in this embodiment includes a fixed base 11 (not shown in the figure), a first rotating member 12, a first tension pulley 14, a second tension pulley 15, a tension pulley holding member 16, and an elastic adjustment member 17.
The difference from the tension transmission 101 in the above-described embodiment is that the tension pulley holding member 16 in the tension transmission 104 includes the arc-shaped guide groove 164. Specifically, the guide groove 164 is a circular arc-shaped sliding groove centered on the rotation axis of the first rotating member 12, and thus the predetermined trajectory is defined by the guide groove 164 as a circular arc-shaped trajectory centered on the rotation axis of the first rotating member 12. And the first tension pulley 14 and the second tension pulley 15 are slidably coupled to the guide grooves 164, respectively, so that the first tension pulley 14 and the second tension pulley 15 are supported on both sides of the traction member 60 between the first rotating member 12 and the driving wheel 20 and swing along a predetermined circular arc locus by the cooperation of the elastic adjusting member 17 and the guide grooves 164.
Specifically, in order to achieve the above-mentioned object by the elastic adjustment member 17 and the guide groove 164 together, the first tension pulley 14 and the second tension pulley 15 may be rotatably coupled to the sliders, respectively, and then the two sliders to which the first tension pulley 14 and the second tension pulley 15 are coupled may be slidably inserted into the guide groove 164, while the elastic adjustment member 17 is hinge-coupled to the two sliders, respectively. Of course, the first tensioning wheel 14 and the second tensioning wheel 15 may be connected to the elastic adjustment member 17 and the guide groove 164 by other connection methods, but the embodiment of the present invention is not limited thereto as long as the purpose of swinging the first tensioning wheel 14 and the second tensioning wheel 15 along the circular arc track can be achieved. The tension transmission device 104 in this embodiment has the same advantages as the tension transmission device 101 in the above-described embodiment, and therefore, the description thereof is omitted.
In addition, the tension transmission device 104 is simple in structure and assembly by providing the guide rail, eliminating the complicated operation of providing the first tensioning arm 16a and the second tensioning arm 16b in the tensioning wheel holding member 16 and rotatably connecting the first tensioning arm 16a and the second tensioning arm 16b to the fixed base 11. And the two ends of the guide rail can provide a stroke limiting effect for the first tensioning wheel 14 and the second tensioning wheel 15, so that the problem that the swing amplitude of the first tensioning wheel 14 and the second tensioning wheel 15 is too large and the wrap angle of the traction component 60 cannot be effectively limited can be avoided, the service life of the traction component 60 can be further prolonged, and the use reliability of the tension transmission device 104 is improved.
Moreover, in the process that the first tensioning wheel 14 and the second tensioning wheel 15 slide along the arc-shaped guiding rail, the arc-shaped guiding rail can provide a certain friction force for the first tensioning wheel 14 and the second tensioning wheel 15, so that the swinging frequency of the first tensioning wheel 14 and the second tensioning wheel 15 under the thrust action of the traction component 60 can be reduced, the vibration frequency of the first tensioning wheel 14 and the second tensioning wheel 15 can be further limited, and the problems that the traction component 60 is locally stressed and is easily subjected to fatigue damage due to the influence of alternating load can be better solved.
In addition, with the tension transmission device 104 of the present embodiment, the arc-shaped guide groove 164 may be replaced with another guide rail, so that the purpose of swinging the first tension pulley 14 and the second tension pulley 15 along a predetermined arc track is achieved by the cooperation of the other guide rail and the elastic adjustment member 17. In the present embodiment, the guide rail may be an arc-shaped guide rail (not shown in the figure), and the arc-shaped guide rail may also define the predetermined trajectory as an arc-shaped trajectory centered on the rotation axis of the first rotating member 12. Specifically, in order to slidably connect the first tension wheel 14 and the second tension wheel 15 to the guide rail, the surface of the guide rail facing the first tension wheel 14 and the second tension wheel 15 has a slide rail with a dovetail-shaped cross section, and the first tension wheel 14 and the second tension wheel 15 are respectively connected with a slide block, and the slide block has a slide groove matching with the dovetail-shaped slide rail of the guide rail. Thereby, the first tensioning wheel 14 and the second tensioning wheel 15 can be slidably connected to the guide rail simultaneously by means of a snap fit between the slide and the guide rail. And the elastic adjusting part 17 is also hinged with the sliding blocks of the first tensioning wheel 14 and the second tensioning wheel 15 respectively so as to limit the swing amplitude of the first tensioning wheel 14 and the second tensioning wheel 15.
In the tension transmission device 104 according to the embodiment of the present invention, the installation positions of the guide groove 164 and the guide rail are not limited, and for example, the guide groove 164 or the guide rail may be installed on a plate body, and the plate body may be fixed to any fixed structure, as long as the first tension pulley 14 and the second tension pulley 15 can be swung along a predetermined arc trajectory by engaging with the elastic adjustment member 17 through the guide groove 164 or the guide rail, and the traction member 60 can be pressed toward each other.
In addition, in the above embodiments, only the manner in which the first rotating member 12, the first tension pulley 14, and the second tension pulley 15 are rotatably provided on the respective support structures by bearings, that is, rotatably provided on the fixed base 11 and the tension pulley holding member 16 by bearings, respectively, is shown, but embodiments of the present invention are not limited thereto. In other embodiments, in order to enable the first rotating member 12, the first tensioning wheel 14 and the second tensioning wheel 15 to smoothly transmit with the traction member 60, the first rotating member 12, the first tensioning wheel 14 and the second tensioning wheel 15 may be fixedly arranged on the corresponding supporting structures, and at the same time, a member in the form of a bushing is rotatably sleeved on the outer periphery of the first rotating member 12, the first tensioning wheel 14 and the second tensioning wheel 15.
In other embodiments, the first tensioning wheel 14 and the second tensioning wheel 15 may be held outside the traction member 60 between the first rotating member 12 and the second rotating member by a structure other than the tensioning wheel holding member 16, and simultaneously press the traction member 60 toward each other, and may swing by the thrust of the traction member 60.
Further, according to an embodiment of the invention, a pitch system (the overall structure is not shown in the figures) is also provided. The pitch system comprises: the wind generating set comprises a driving motor, a tension transmission device in any of the above embodiments, a second rotating part and a traction part 60, wherein the first rotating part 12 in the tension transmission device is used as a driving wheel and is in transmission connection with the driving motor, and the second rotating part is connected with a blade (not shown in the figure) of the wind generating set and drives the blade to rotate. In a pitch system, for example, in order to achieve accurate transmission, the traction member 60 in the tensioning transmission is a conveyor belt, such as a toothed belt, and the first rotating member 12 is a pulley cooperating with the toothed belt. However, it should be noted that when the tensioning transmission device is applied to other fields, the traction member 60 may also be a transmission chain or a traction wire, and the first rotating member 12 is a sprocket or other rotating member that is driven by the transmission chain. Because the variable pitch system is provided with the tensioning transmission device in the embodiment, the variable pitch system has the same advantages as the tensioning transmission device, so that the use reliability of the variable pitch system can be improved, the problem that the transmission structure in the variable pitch system has a problem and the normal work of the whole wind generating set is influenced can be avoided.
In addition, as can be understood from the above embodiments, the tensioning transmission device mentioned in the embodiments of the present invention can also be applied to other fields, and is connected between a driving mechanism and an actuating mechanism to achieve the purpose of power transmission.
Furthermore, when the tensioning transmission device in the above-described embodiment is applied to a pitch system of a wind turbine, the first and second fixed structures may be understood as a hub of a wind turbine or other fixed structures arranged on the hub.
In general, the blades of the wind turbine generator set are rotatably connected to the hub 40 by a pitch bearing 30, the pitch bearing 30 includes an outer ring 31 and an inner ring 32, in an exemplary embodiment, the outer ring 31 is connected to the blades, and the inner ring 32 is connected to the hub, so that the first rotating member 12 can be driven by the traction member 60 in cooperation with the outer ring 31 for the purpose of driving the blades to pitch.
FIG. 9 is a cross-sectional structural schematic view of one particular example of a second rotating component of a pitch system in cooperation with a traction component 60 according to an embodiment of the present invention; FIG. 10 is a cross-sectional structural schematic view of another specific example of a second rotating component in a pitch system cooperating with a traction component 60 according to an embodiment of the invention; FIG. 11 is a cross-sectional structural schematic view of yet another specific example of a second rotating component in a pitch system in cooperation with a traction component 60 according to an embodiment of the invention. Fig. 9 to 11 show only the structure of the engaging portion between the traction member 60 and the second rotating member.
Referring to FIG. 9, in an alternative embodiment, the second rotating part in the pitch system is the inner ring 32 of the pitch bearing 30. Specifically, when the second rotating component that is driven in cooperation with the traction component 60 is the inner ring 32, the outer ring 31 of the pitch bearing 30 is fixedly connected to the hub 40, and the inner ring 32 is fixedly connected to the blade root 50. Since the tension transmission device (not shown in the figures) is located outside the blade, the inner ring 32 needs to be engaged with the traction component 60 by providing an annular extension 321 protruding from the outer ring 31 in the axial direction of the pitch bearing 30 and by providing gear teeth 322 on the outer circumferential surface of the annular extension 321. Therefore, the purpose of driving the blades to change the pitch can be achieved through the transmission fit of the traction component 60 and the inner ring 32.
Compared with the mode that the traction part 60 is in transmission fit with the outer ring 31 of the variable pitch bearing 30 to drive the blades to change the pitch, the size of the inner ring 32 can be increased under the condition that the specifications of the blades are the same, the pitch diameter of the bolts connected between the variable pitch bearing 30 and the blades and the number of the bolts can be increased, the surrounding area of the periphery of the inner ring 32 of the traction part 60 is increased, the load resistance of the blade root 50 can be improved, the load borne by a single bolt is reduced, the load borne by the variable pitch bearing 30 is reduced, and the use reliability of a variable pitch system can be further improved.
Referring to FIG. 10, in another alternative embodiment, the second rotating component in the pitch system is an annular transition joint section 51 connected to the blade root 50. Specifically, when the second rotating component that is driven in cooperation with the traction component 60 is the transition connection section 51, the outer ring 31 of the pitch bearing 30 is fixedly connected to the hub 40, and the inner ring 32 is fixedly connected to the blade root 50 through the transition connection section 51. Illustratively, the traction component 60 is a toothed belt, and the transition connecting section 51 and the blade are of an integral structure, that is, the gear teeth 501 may be directly provided on the outer peripheral surface of the root of the blade, so as to engage and cooperate with the traction component 60 through the gear teeth 501, thereby achieving the purpose of driving the blade to pitch through the transmission of the traction component 60 and the blade.
The driving blade is driven to execute the variable pitch action in the transmission matching mode, the variable pitch accuracy of the blade can be improved, the gear teeth 501 can be machined while the blade is produced, the complex machining process of arranging the gear teeth on the variable pitch bearing 30 is omitted, the machining difficulty of a variable pitch system is reduced, and meanwhile the cost of the variable pitch system is also reduced.
Referring to fig. 11, in a further alternative embodiment, the second rotating part of the pitch system is also an annular transition piece 51 connected to the blade root 50, but differs from the application shown in fig. 10 in that the transition piece 51 in this embodiment is a split structure from the blade. Similarly, the outer ring 31 of the pitch bearing 30 is fixedly connected to the hub 40, while the inner ring 32 is fixedly connected to the blade root 50 via a transition connection section 51. The traction means 13 is exemplarily a toothed belt. The outer surface of the transition connecting section 51 is connected with an annular supporting surface 512 through an annular connecting piece 511, and the outer peripheral surface of the supporting surface 512 is provided with gear teeth 513 so as to be meshed and matched with the traction part 60 through the gear teeth 513, so that the traction part 60 and the blades can be matched for transmission, and the purpose of driving the blades to change the pitch is achieved.
The driving blade is driven to perform the variable pitch action through the transmission matching mode, and the surrounding area of the traction part 60 on the periphery of the blade root 50 can be increased, so that the load resistance of the blade root 50 can be improved. Moreover, the transition connecting section 51 can be manufactured into a standard part for mass production, so that the production efficiency of the variable pitch system can be improved, and the manufacturing cost of the variable pitch system can be reduced.
In addition, according to another embodiment of the present invention, a wind turbine generator set (not shown in the drawings) is further provided, which includes the pitch system of the above embodiment, and therefore has the same advantages as the pitch system, and therefore, the detailed description thereof is omitted.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Also, different features that are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims.
Claims (18)
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| CN201710889667.5A CN109555645B (en) | 2017-09-27 | 2017-09-27 | Tensioning drives, pitch systems and wind turbines |
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| CN201710889667.5A CN109555645B (en) | 2017-09-27 | 2017-09-27 | Tensioning drives, pitch systems and wind turbines |
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| CN202812023U (en) * | 2012-08-28 | 2013-03-20 | 天津市亚安科技股份有限公司 | Bilateral pressing belt wheel structure for synchronous belt transmission |
| CN203230800U (en) * | 2013-03-11 | 2013-10-09 | 朗美(厦门)健身器材有限公司 | Belt synchronizing device of exercise bicycle |
| CN205841006U (en) * | 2016-06-28 | 2016-12-28 | 上汽通用汽车有限公司 | Belt start and stop train |
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| CN109555645A (en) | 2019-04-02 |
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Address after: No.107 Shanghai Road, Urumqi Economic and Technological Development Zone, Urumqi City, Xinjiang Uygur Autonomous Region Patentee after: Jinfeng Technology Co.,Ltd. Address before: No.107 Shanghai Road, Urumqi Economic and Technological Development Zone, Urumqi City, Xinjiang Uygur Autonomous Region Patentee before: XINJIANG GOLDWIND SCIENCE & TECHNOLOGY Co.,Ltd. |