CN109555651B

CN109555651B - Transmission device, variable pitch system and wind generating set

Info

Publication number: CN109555651B
Application number: CN201710891149.7A
Authority: CN
Inventors: 郭拥军; 李倩; 武青虎
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2017-09-27
Filing date: 2017-09-27
Publication date: 2020-04-28
Anticipated expiration: 2037-09-27
Also published as: CN109555651A

Abstract

The invention relates to a transmission device, a variable pitch system and a wind generating set, wherein the transmission device can be in transmission fit with a traction component, and the transmission device comprises: a support member; a first rotating member rotatably coupled to the supporting member; a tension wheel connected to the support member and spaced from the first rotation member; the tensioning wheel and the first rotating component can be matched through the traction component; and the adjusting component is connected with the tension wheel and the supporting component and used for limiting the motion trail of the tension wheel so as to enable the tension wheel to do self-adjusting type reciprocating linear motion along the radial direction of the tension wheel relative to the supporting component between the first motion limit position and the second motion limit position. The invention can be used for transmitting the power of a power source to a load, and meanwhile, on the basis of ensuring the wrap angle requirement of the traction part, the local fracture phenomenon caused by local stress concentration of the traction part can be avoided.

Description

Transmission device, variable pitch system and wind generating set

Technical Field

The invention relates to the technical field of wind power, in particular to a transmission device, a variable pitch system and a wind generating set.

Background

The transmission device is used for transmitting the power of a power source to intermediate equipment such as a load, a common traction component of the transmission device is a transmission belt or a transmission chain, the power of the power source is transmitted to the load through the transmission belt, the transmission chain and corresponding rotating components matched with the transmission belt, such as a belt pulley or a chain wheel, and in order to ensure the wrap angle requirement of the traction component on the corresponding rotating component, a tension pulley which applies tension to the traction component is usually arranged.

Taking a pitch system of a wind generating set as an example, a pitch transmission device of the current pitch system generally changes the pitch through a transmission belt, and the principle of changing the pitch through the transmission belt is as follows: the hub is used as a base body, the inner ring of the variable pitch bearing is connected to the hub, the outer ring of the variable pitch bearing is connected to the blade, the transmission belt is connected to the outer side of the outer ring of the variable pitch bearing, the transmission belt is driven to move through the driving wheel of the variable pitch driving assembly, the outer ring of the variable pitch bearing and the blade are driven to rotate, and variable pitch of the blade is achieved. And a tension wheel is arranged on the outer side of the transmission belt and acts on the transmission belt to ensure the wrap angle requirement of the transmission belt enveloping the driving wheel.

The take-up pulley among prior art's transmission though can satisfy the drive belt cornerite requirement, can't adjust the problem that partial atress of traction part is concentrated, like in the oar system that becomes, when the oar system that becomes receives ultimate load, the drive belt can be concentrated in the atress of positions such as drive wheel, take-up pulley, increases the fatigue damage of drive belt, and then causes the local fracture of drive belt easily.

Therefore, a new transmission device, a pitch system and a wind generating set are needed.

Disclosure of Invention

The embodiment of the invention provides a transmission device, a variable pitch system and a wind generating set, wherein the transmission device can be used for transmitting the power of a power source to a load, and meanwhile, the local fracture phenomenon caused by local stress concentration of a traction part can be avoided on the basis of ensuring the wrap angle requirement of the traction part.

An embodiment of the present invention provides a transmission device, which can be in transmission fit with a traction component, and includes: a support member; a first rotating member rotatably coupled to the supporting member; the tensioning wheel is connected with the supporting component and is arranged at a distance from the first rotating component, and the tensioning wheel and the first rotating component can be matched through the traction component; and the adjusting component is connected with the tension wheel and the supporting component and used for limiting the motion trail of the tension wheel so as to enable the tension wheel to do self-adjusting type reciprocating linear motion along the radial direction of the tension wheel relative to the supporting component between the first motion limit position and the second motion limit position.

According to an aspect of the embodiment of the present invention, the movement locus of the tension pulley and the extending direction of the traction member between the tension pulley and the first rotating member are parallel to each other.

According to an aspect of the embodiment of the present invention, the supporting component includes a fixing base and a supporting frame connected to the fixing base, the supporting frame includes a first supporting portion and a second supporting portion disposed opposite to each other, and the first rotating component is rotatably connected to the supporting component through the first supporting portion and the second supporting portion.

According to an aspect of the embodiment of the present invention, the adjustment member includes a first adjustment member provided between the tension pulley and the first support portion, and a second adjustment member provided between the tension pulley and the second support portion.

According to an aspect of an embodiment of the present invention, the tension pulley includes a main body, and a first mounting portion and a second mounting portion at both ends of the main body, the first mounting portion is provided with a first mounting groove, the second mounting portion is provided with a second mounting groove, the first mounting portion is disposed in the first mounting groove and interconnected by a first adjusting member, the second mounting portion is disposed in the second mounting groove and interconnected by a second adjusting member, and the main body can be pressed against the traction member.

According to one aspect of the embodiment of the invention, the first installation part and the second installation part are both of a columnar structure, the first rotary bearing is arranged between the first adjusting part and the first installation part, the inner ring of the first rotary bearing is sleeved on the first installation part, the second rotary bearing is arranged between the second adjusting part and the second installation part, and the inner ring of the second rotary bearing is sleeved on the second installation part.

According to an aspect of the embodiment of the present invention, the first mounting portion and the second mounting portion are both of a guide block structure, the first mounting groove and the second mounting groove are both of a strip-shaped groove, the strip-shaped groove extends along a movement track of the tensioning wheel, and the guide block structure can make a reciprocating linear motion along the corresponding strip-shaped groove.

According to one aspect of the embodiment of the invention, the main body part comprises a roller and a sleeve sleeved on the outer peripheral surface of the roller, the roller is integrally formed with the first mounting part and the second mounting part, a third rotary bearing is arranged between the sleeve and the roller so as to enable the sleeve and the roller to be rotatably connected, and the main body part can be pressed on the traction part through the sleeve.

According to an aspect of an embodiment of the present invention, the adjustment member includes a spring damper and/or an elastic member.

According to the transmission device provided by the embodiment of the invention, the transmission device can be in transmission fit with the traction part, the transmission device comprises a supporting part, a first rotating part, a tensioning wheel and an adjusting part, the first rotating part is rotatably connected to the supporting part, the tensioning wheel is connected to the supporting part and is arranged at a distance from the first rotating part, and the adjusting part is connected to the tensioning wheel and the supporting part, so that the motion trail of the tensioning wheel can be limited, and the tensioning wheel can perform self-adjusting type reciprocating linear motion relative to the supporting part along the radial direction of the tensioning wheel. When the transmission device is used, the tensioning wheel can do reciprocating linear motion along the radial self-adjusting mode relative to the supporting component, so that the position of the tensioning wheel can be adjusted along the straight line according to the stress condition of the traction component, the local fracture phenomenon caused by local stress concentration of the traction component can be avoided on the basis of meeting the wrap angle requirement of the traction component, meanwhile, the tensioning wheel only moves between the first movement limit position and the second movement limit position relative to the supporting component, the collision with the first rotating component in the moving process is avoided, and the safety of the transmission device is ensured.

In another aspect, an embodiment of the present invention provides a pitch control system for a wind turbine generator system, where the wind turbine generator system includes a hub and blades, and the pitch control system includes: a drive member; the variable-pitch bearing comprises a fixed ring and a rotating ring, and the fixed ring is connected with the hub; the second rotating part connects the rotating ring and the blade, and the transmission device and the first connecting part are connected with the output end of the driving device; and the traction part is in transmission fit with the first rotating part and the second rotating part so as to drive the blades to change the pitch, wherein the tension wheel is in pressure joint with the traction part so as to apply tension to the traction part.

According to another aspect of the embodiment of the invention, the second rotating member is an extension of the rotating ring extending axially along the pitch bearing, and the extension is in driving engagement with the traction member.

According to another aspect of an embodiment of the invention, the second rotating member is a root of a blade, the root of the blade being in driving engagement with the traction member.

According to another aspect of the embodiment of the invention, the second rotating member is a transition disc connected between the rotating ring and the blades, the transition disc comprises an annular member arranged around the axis of the pitch bearing, and the traction member is in driving fit with the outer peripheral surface of the annular member.

In another aspect, the embodiment of the invention provides a wind generating set, which includes the above pitch system.

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 diagram of a transmission according to one embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a transmission according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a front view of a transmission of one embodiment of the present invention;

FIG. 5 is a cross-sectional view of one embodiment of the present invention taken along the line B-B in FIG. 4;

FIG. 6 is a schematic diagram of a transmission of another embodiment of the present invention;

FIG. 7 is a schematic diagram of a transmission of yet another embodiment of the present invention;

FIG. 8 is a cross-sectional view taken along line B-B of FIG. 4 of yet another embodiment of the present invention;

FIG. 9 is a cross-sectional view taken along line B-B of FIG. 4 of yet another embodiment of the present invention;

FIG. 10 is a cross-sectional view taken along line B-B of FIG. 4 of yet another embodiment of the present invention;

FIG. 11 is a cross-sectional view taken along the line C-C of FIG. 10;

FIG. 12 is a cross-sectional view taken along line B-B of FIG. 4 of yet another embodiment of the present invention;

FIG. 13 is a partial cross-sectional view of a pitch system of an embodiment of the present invention;

FIG. 14 is a partial cross-sectional view of a pitch system of another embodiment of the present invention;

FIG. 15 is a partial cross-sectional view of a pitch system of yet another embodiment of the invention.

Wherein:

1-a hub; 2-a blade;

10-a support member;

11-a fixed seat; 111-connection hole;

12-a support frame; 121-a first support part; 122-a second support; 123-a first mounting groove; 124-a second mounting groove; 125-coaming; 126-perforation;

20-a first rotating member;

30-a tension wheel;

31-a body portion; 311-roller; 312-a sleeve; 313-a limit protrusion; 314-a dead end collar;

32-a first mounting portion;

33-a second mounting portion;

40-a traction member;

50-an adjustment member; 51-a first adjustment member; 52-a second adjustment member;

60-a second rotating member; 61-a base disc; 62-an annulus;

70-a first slew bearing; 71-a first transition sleeve;

80-a second slew bearing; 81-a second transition sleeve;

90-a third slew bearing;

200-a pitch bearing; 201-rotation ring; 202-a retaining ring;

300-connecting bolts.

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

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means one or more than one; "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The directional terms used in the following description are intended to be illustrative in all directions, and are not intended to limit the specific construction of the 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; may be directly connected or indirectly connected through an intermediate. 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 transmission device provided by the embodiment of the invention can be used for transmitting the power of a power source to a load, and meanwhile, on the basis of ensuring the wrap angle requirement of the traction part, the local fracture phenomenon caused by local stress concentration of the traction part can be avoided. Especially in the technical field of wind power, the variable-pitch propeller can be used in a variable-pitch system of a wind generating set to realize the variable pitch of blades. The following embodiments of the present invention only describe the transmission device by using a pitch system of a wind turbine generator system as an example, but the application of the transmission device of the embodiments of the present invention is not limited to the following embodiments, and the transmission device may be installed in other fields requiring the transmission device and protected.

For a better understanding of the invention, a transmission according to an embodiment of the invention will be described in detail below with reference to fig. 1 to 12.

Referring to fig. 1, fig. 2 and fig. 3 together, an embodiment of the present invention provides a transmission device, capable of being in transmission cooperation with a traction component 40, including: the device comprises a supporting component 10, a first rotating component 20, a tension pulley 30 and an adjusting component 50, wherein the first rotating component 20 is rotatably connected with the supporting component 10, the tension pulley 30 is connected with the supporting component 10 and is arranged at a distance from the first rotating component 20, the tension pulley 30 and the first rotating component 20 can be matched through a traction component 40, the adjusting component 50 is connected with the tension pulley 30 and the supporting component 10 and can limit the motion trail of the tension pulley 30, so that the tension pulley 30 can do self-adjusting reciprocating linear motion along the radial direction of the adjusting component between a first motion limit position and a second motion limit position relative to the supporting component 10.

When the transmission device provided by the embodiment of the invention is used specifically, the first rotating member 20 can be in transmission connection with the second rotating member 60 through the traction member 40, the first rotating member 20 can transmit power to the second rotating member 60 through the traction member 40, or the traction member 40 can receive power from the second rotating member 60, the tensioner 30 can apply tension to the traction member 40, that is, the transmission provided by the embodiment of the invention can be used for transmitting the power of the power source to the load, and at the same time, due to the self-adjusting reciprocating linear motion of the tension pulley 30 relative to the support member 10 between the first extreme movement position and the second extreme movement position along the radial direction thereof, on the basis of ensuring the wrap angle requirement of the traction component 40, the phenomenon that the traction component 40 is locally stressed and is locally broken can be avoided.

Specifically, referring to fig. 4 and 5, the supporting member 10 includes a fixing base 11 and a supporting frame 12 connected to the fixing base 11, the supporting frame 12 includes a first supporting portion 121 and a second supporting portion 122 disposed opposite to each other, the first supporting portion 121 and the second supporting portion 122 are both plate-shaped structures, the first supporting portion 121 and the second supporting portion 122 are connected by a surrounding plate 125 to form a housing with an accommodating space, two through holes 126 for the traction member 40 to pass through are disposed on the surrounding plate 125, the first supporting portion 121, the second supporting portion 122 and the surrounding plate 125 are preferably integrally formed, the supporting frame 12 is connected to the fixing base 11 by the first supporting portion 121, the first supporting portion 121 may be integrally formed with the fixing base 11 or may be connected by welding, the fixing base 11 is a disc-shaped structure, the connecting holes 111 are disposed on the periphery of the fixing base 11, a first mounting groove 123 is disposed on the first supporting portion 121, the second supporting portion 122 is provided with a second mounting groove 124, and the first mounting groove 123 and the second mounting groove 124 are oppositely arranged, in this embodiment, the first mounting groove 123 and the second mounting groove 124 are both circular grooves.

The first rotating member 20 is a pulley structure, and the first rotating member 20 is located between the first support 121 and the second support 122, and both ends thereof are rotatably mounted on the first support 121 and the second support 122 through bearings.

The tensioning wheel 30 comprises a main body part 31, and a first mounting part 32 and a second mounting part 33 which are positioned at two ends of the main body part 31, wherein the main body part 31, the first mounting part 32 and the second mounting part 33 are all in a circular columnar structure, the diameters of the first mounting part 32 and the second mounting part 33 are smaller than that of the main body part 31, the first mounting part 32 is arranged in a first mounting groove 123, and the second mounting part 33 is arranged in a second mounting groove 124.

Adjusting part 50 includes first adjusting part 51 and second adjusting part 52, and first adjusting part 51 includes two spring damper, and two spring damper symmetries of first adjusting part 51 set up in first mounting groove 123, and the one end of two spring damper is connected in first installation department 32, and the other end is connected on enclosing the cell wall that closes first mounting groove 123, through first adjusting part 51 with first installation department 32 and first mounting groove 123 interconnect. The second adjusting member 52 includes two spring dampers, the two spring dampers of the second adjusting member 52 are symmetrically disposed in the second mounting groove 124, one ends of the two spring dampers are connected to the second mounting portion 33, the other ends of the two spring dampers are connected to a groove wall enclosing the second mounting groove 124, and the second mounting portion 33 and the second mounting groove 124 are connected to each other through the second adjusting member 52. In order to facilitate the installation of the spring damper, connection grooves are provided on the first installation part 32, the second installation part 33, a groove wall enclosing the first installation groove 123, and a groove wall enclosing the second installation groove 124.

The traction member 40 is a toothed belt having two free ends, one free end of the traction member 40 is inserted into the receiving space through one of the through holes 126 of the shroud 125, is sequentially disposed around the first rotating member 20 and the tension pulley 30, and is inserted out through the other through hole 126, the first rotating member 20 is engaged with the tooth surface side of the traction member 40, and the body portion 31 of the tension pulley 30 is pressed against the flat surface side of the traction member 40.

Therefore, in use, the transmission device according to the embodiment of the present invention may connect the first rotating member 20 with a power source, such as a driving motor, and connect the two free ends of the traction member 40 with the second rotating member 60 connected with a load in a transmission manner, and the power source transmits power to the second rotating member 60 through the transmission device to drive the load to move. The tensioning wheel 30 can guarantee the wrap angle requirement of the traction member 40 on the first rotating member 20, and meanwhile, as the adjusting member 50 is arranged between the tensioning wheel 30 and the supporting member 10, namely two spring dampers are respectively arranged between the first mounting part 32 of the tensioning wheel 30 and the first mounting groove 123 of the supporting member 10 and between the second mounting part 33 of the tensioning wheel 30 and the second mounting groove 124 of the supporting member 10, the elastic parts of the spring dampers can enable the tensioning wheel 30 to reciprocate in a self-adjusting mode, and the cylinder bodies of the damping devices of the spring dampers can limit the movement of the tensioning wheel 30 in a linear direction. Therefore, the tensioning wheel 30 can do reciprocating linear motion along the radial direction of the tensioning wheel 30 in a self-adjusting mode, the stress of the traction part 40 is adjusted elastically, the impact load on the traction part 40 is relieved, the phenomenon of fracture of the traction part 40 caused by local stress concentration can be effectively avoided, and the phenomenon of tooth jumping caused by serious deformation of the traction part 40 due to overlarge stress can be avoided. Moreover, since the adjusting part 50 adopts a spring damper, the damping device of the spring damper can also play a role of vibration absorption, and the fatigue damage of each part of the transmission device is reduced.

Because the spring damper has two limit strokes, the tensioning wheel 30 has a first limit position and a second limit position on the motion track of the self-adjusting reciprocating linear motion, and the tensioning wheel 30 always keeps a gap from the first rotating component 20 when moving from the first limit position to the second limit position, i.e. the tensioning wheel 30 can move according to a preset motion track, so that the tensioning wheel 30 is prevented from colliding with the first rotating component 20 in the self-adjusting motion process, and the safety of the transmission device is ensured.

It is understood that the adjusting member 50 is not limited to include only a spring damper, and in some alternative embodiments, the adjusting member may include both a spring damper and an elastic member such as a spring, for example, in this embodiment, one of the spring dampers of the first adjusting member 51 may be replaced by a spring, and correspondingly, one of the spring dampers of the second adjusting member 52 may be replaced by a spring.

Meanwhile, the number of the spring dampers included in the first adjusting part 51 and the second adjusting part 52 is not limited to two, and referring to fig. 6, in some alternative embodiments, each of the first adjusting part 51 and the second adjusting part 52 may also include one spring damper. Or one of the first and

second adjusting members

51 and 52 includes one spring damper, and the other includes two or more spring dampers. Alternatively, each of the first and

second adjustment members

51 and 52 includes two or more spring dampers. As long as the tensioning wheel 30 can perform self-adjusting reciprocating linear motion along the radial direction of the tensioning wheel, the local fracture phenomenon caused by the local stress concentration of the traction part 40 can be avoided.

It will be appreciated that the traction element 40 is not limited to a toothed belt, but may in alternative embodiments be a drive belt such as a flat belt, a V-belt, a circular belt, or the like, or in the form of a drive chain such as a toothed chain, a roller chain, or the like. Accordingly, the first rotatable member 20 is in the form of a pulley or sprocket that matches the form of the traction member 40 for drive engagement purposes. Meanwhile, the pulling member 40 is not limited to the open loop form, i.e., the pulling member 40 has two free ends, and is connected to the second rotating member 60 through the two free ends. In some alternative embodiments, the traction member 40 may be in the form of a closed loop, as long as it is sufficient to transmit power from the power source to the load, and when the traction member 40 is in the form of a closed loop, a corresponding opening may be provided in the support frame 12 of the support member 10 to facilitate installation of the traction member 40.

In this embodiment, the number of the tensioning wheels 30 is one, but not limited to one, please refer to fig. 7, in some alternative embodiments, one tensioning wheel 30 may be additionally provided, that is, the number of the tensioning wheels 30 may be two, at this time, the two tensioning wheels 30 are preferably distributed on two sides of the first rotating component 20, and apply tensioning force to the traction component 40 from two sides, so as to better ensure the requirement of the wrap angle, and the additional tensioning wheel 30 is connected with the original tensioning wheel 30 and the support component 10 in the same manner, which is not described herein again.

In this embodiment, the force-receiving movement direction of each spring damper of the adjusting member 50 is parallel to the extending direction of the traction member 40 between the tension pulley 30 and the first transmission member, please refer to fig. 3, a coordinate system is established with the rotation center of the first rotation member 20 as the origin, the included angle between the extending direction of the traction member 40 between the first rotation member 20 and the tension pulley 30 and the Y-axis of the coordinate system is α, the included angle between the force-receiving movement direction of each spring damper of the adjusting member 50 and the Y-axis is equal to β and β, so that the movement track of the tension pulley 30 is parallel to the extending direction of the traction member 40 between the tension pulley 30 and the first transmission member, when the tension pulley 30 performs self-adjusting reciprocating linear movement, the wrap angle value of the traction member 40 around the first rotation member 20 is always kept unchanged, the slippage and tooth skipping phenomenon between the traction member 40 and the first rotation member 20 due to the decrease of the wrap angle during the movement of the tension pulley 30 can be effectively prevented, and the torque transmitted by the traction member 40 is ensured to be constant.

As an alternative embodiment, referring to fig. 8, a first rotary bearing 70 is further disposed between the two spring dampers of the first adjusting member 51 and the first mounting portion 32 of the tension pulley 30, an inner ring of the first rotary bearing 70 is sleeved on the first mounting portion 32, and one end of the two spring dampers of the first adjusting member 51 facing the first rotary bearing 70 is connected to an outer ring of the first rotary bearing 70. A second slewing bearing 80 is further provided between the two spring dampers of the second adjustment member 52 and the second mounting portion 33 of the tension pulley 30, an inner ring of the second slewing bearing 80 is fitted over the second mounting portion 33, and one end of the two spring dampers of the second adjustment member 52 facing the second slewing bearing 80 is connected to an outer ring of the second slewing bearing 80. By providing the first slewing bearing 70 and the second slewing bearing 80, the tensioning pulley 30 can freely rotate around the axis thereof while being capable of self-adjusting reciprocating motion relative to the support member 10, so that the sliding friction between the main body 31 of the tensioning pulley 30 and the traction member 40 is converted into rolling friction, the friction damage of the tensioning pulley 30 to the traction member 40 is reduced, and the service life of the traction member 40 is prolonged.

In order to ensure the strength and the versatility of the first and

second slewing bearings

70 and 80, it is preferable that a first transition sleeve 71 is fitted over the outer ring of the first slewing bearing 70, and in this case, one ends of the two spring dampers of the first adjustment member 51 facing the first slewing bearing 70 are connected to the outer ring of the first slewing bearing 70 through the first transition sleeve 71. A second transition sleeve 81 is sleeved on the outer ring of the second slewing bearing 80, and at this time, one end of the two spring dampers of the second adjusting part 52 facing the second slewing bearing 80 is connected with the outer ring of the second slewing bearing 80 through the second transition sleeve 81. Meanwhile, the first transition sleeve 71 and the second transition sleeve 81 are provided with connecting grooves corresponding to the spring damper, so that the spring damper can be conveniently installed.

Of course, it is understood that the conversion of the sliding friction between the main body 31 of the tension pulley 30 and the traction member 40 into the rolling friction is not limited to the above. Referring to fig. 9, in some alternative embodiments, the main body 31 includes a roller 311 and a sleeve 312 disposed on an outer peripheral surface of the roller 311, the roller 311 is integrally formed with the first mounting portion 32 and the second mounting portion 33, a third rotary bearing 90 is disposed between the sleeve 312 and the roller 311, and the third rotary bearings 90 include two ones, which are respectively disposed at or near two ends of the sleeve 312. A limiting protrusion 313 is arranged in the sleeve 312 and at a position where the roller 311 corresponds to one of the third rotary bearings 90, and an end stopping collar 314 is arranged at a position where the roller 311 corresponds to the other third rotary bearing 90 in an interference manner, so as to limit the two third rotary bearings 90. By providing the third slewing bearing 90 between the sleeve 312 and the roller 311 so that the sleeve 312 and the roller 311 are rotationally coupled, the main body portion 31 is pressed against the traction member 40 via the sleeve 312. In this case, the first slewing bearing 70 may be provided between the first adjusting member 51 and the first mounting portion 32, but it is needless to say that the embodiment may be adopted, the first slewing bearing 70 is not provided, and accordingly, the second slewing bearing 80 may be provided between the second adjusting member 52 and the second mounting portion 33, and of course, the embodiment may be adopted, the second slewing bearing 80 is not provided, and the adjustment may be performed according to the use requirement, as long as the requirement that the sliding friction between the main body portion 31 of the tensioning sheave 30 and the traction member 40 is changed into the rolling friction, the friction damage of the tensioning sheave 30 to the traction member 40 is reduced, and the service life of the traction member 40 is improved can be satisfied.

It is understood that the structures of the first mounting part 32, the second mounting part 33, the first mounting groove 123 and the second mounting groove are not limited to the above-described forms. In some alternative embodiments, the form shown in fig. 10 and 11 can also be adopted. The embodiment shown in fig. 10 and 11 is substantially the same as the embodiment shown in fig. 5, except that in this embodiment, the first mounting portion 32 and the second mounting portion 33 are both a guide block structure, the first mounting groove 123 and the second mounting groove are both strip-shaped grooves, the strip-shaped grooves extend along the motion track of the tensioning wheel 30, the guide block structure can perform reciprocating linear motion along the corresponding strip-shaped grooves, and the motion track of the tensioning wheel 30 is defined by the form that the guide block structure is matched with the strip-shaped grooves, at this time, both the first adjusting member 51 and the second adjusting member 52 may include two spring dampers, and the forced motion directions of the two spring dampers of the first adjusting member 51 and the two spring dampers of the second adjusting member 52 are the same as the extending direction of the strip-shaped grooves. Of course, since the strip-shaped groove and the guide block structure already define the movement track of the tensioning wheel 30, the first adjusting member 51 and the second adjusting member 52 may not take the form of a spring damper, in some alternative embodiments, the first adjusting member 51 and the second adjusting member 52 may only include an elastic member, such as only an elastic member capable of generating elastic deformation, such as a spring or a rubber block, to bear the pressure brought by the tensioning wheel, so that the tensioning wheel 30 can perform a self-adjusting reciprocating motion, and the number of the elastic members included in the first adjusting member 51 and the second adjusting member 52 may be set according to the use requirement.

When the first installation portion 32 and the second installation portion 33 are both of a guide block structure, and the first installation groove 123 and the second installation groove 124 are both of a strip groove structure, in order to convert the sliding friction between the main body portion 31 of the tensioning wheel 30 and the traction component 40 into rolling friction, please refer to fig. 12 together, in this embodiment, on the basis of the embodiment shown in fig. 10 and 11, the main body portion 31 of the tensioning wheel 30 includes a roller 311 and a sleeve 312 that is sleeved on the outer peripheral surface of the roller 311, the roller 311 is integrally formed with the first installation portion 32 and the second installation portion 33, a third pivot bearing 90 is disposed between the sleeve 312 and the roller 311, and the manner of matching the third pivot bearing 90 with the roller 311 and the sleeve 312 is the same as that of the embodiment shown in fig. 9, which will not be described herein.

Referring to fig. 13, an embodiment of the present invention further provides a pitch system, which is used for a wind generating set, the wind generating set includes a hub 1 and blades 2, the pitch system includes a driving component, a pitch bearing 200, a second rotating component 60, a transmission device and a traction component 40 according to any of the above embodiments, the pitch bearing 200 includes a fixed ring 202 and a rotating ring 201, in this embodiment, the rotating ring 201 is an inner ring of the pitch bearing 200, the fixed ring 202 is an outer ring of the pitch bearing 200, the fixed ring 202 is connected to the hub 1, the second rotating component 60 connects the rotating ring 201 and the blades 2, the traction component 40 is a toothed belt, correspondingly, the first rotating component 20 is a belt wheel capable of meshing with the toothed belt for transmission, the driving component employs a motor, the first rotating component 20 is connected to an output end of the driving component, in this embodiment, the second rotating component 60 is an extension portion of the rotating ring 201 extending along an axial direction of the pitch bearing 200, specifically, the inner ring of the pitch bearing 200, the second rotating member 60 and the blade 2 may be fixed by a plurality of connecting bolts 300, teeth capable of transmitting with the inner core of the traction member 40 may be disposed on the extension portion, the traction member 40 is in transmission fit with the first rotating member 20 and the second rotating member 60 to drive the blade 2 to pitch, and the tension pulley 30 is pressed against the traction member 40 to apply a tension to the traction member 40, in a specific implementation, the fixing seat 11 of the supporting member 10 (not shown) may be directly connected to the hub 1, or may be indirectly connected to the hub 1 by another member fixedly connected to the hub 1, and may be set according to a specific requirement.

The second rotating member 60 is not limited to be an extension of the rotating ring 201 extending along the axial direction of the pitch bearing 200, and in some alternative implementations, referring to fig. 14, the second rotating member 60 may also be a root of the blade 2, a tooth capable of meshing with the traction member 40 may be provided at the root of the blade 2, the root of the blade 2 and the rotating ring 201 of the pitch bearing 200 may be fixed by a plurality of connecting bolts 300, and the traction member 40 drives the blade 2 to pitch. Of course, referring to fig. 15, the second rotating member 60 may also be a transition disc connected between the rotating ring 201 and the blade 2, the transition disc includes a base disc 61 and a ring member 62, the base disc 61 and the ring member 62 are integrally formed, the base disc 61 is in an annular structure and can be fixed with the blade 2 and the rotating ring 201 of the pitch bearing 200 through a plurality of connecting bolts 300, the ring member 62 is in an annular structure and is arranged around the axis of the pitch bearing 200, the inner diameter of the ring member 62 is larger than the outer diameter of the pitch bearing 200, the traction member 40 is in meshing transmission fit with the outer circumferential surface of the ring member 62, and the traction member 40 drives the blade 2 to pitch.

It will be appreciated that the rotating ring 201 is not limited to the inner ring of the pitch bearing 200, but may in alternative embodiments also be the outer ring of the pitch bearing 200.

Therefore, the pitch control system provided by the embodiment of the invention has the same advantages as the transmission device due to the inclusion of the transmission device of any embodiment, when the traction part 40 on one side of the adjusting part 50 is the tight side, the adjusting part 50 can elastically adjust the stress of the tight side to a certain extent, so that the tooth profile deformation at the meshing part caused by the excessive stress of the tight side is prevented from being serious, and the tooth skipping is prevented, and meanwhile, the local fracture phenomenon caused by the local stress concentration of the traction part 40 can be avoided. When the toothed belt on one side of the adjusting part 50 is a loose edge, the adjusting part 50 can compress the loose edge to a certain extent, so that the tension of the loose edge is prevented from being zero and jumping off from the edge of the meshing tooth profile. The damping structure of the spring damper can play a role in absorbing shock, and fatigue damage of the variable-pitch accessory is reduced.

Meanwhile, the rotating ring 201 is an inner ring of the variable pitch bearing 200, and the variable pitch bearing 200 is directly or indirectly driven to change the pitch, so that the size of the variable pitch bearing 200 is correspondingly increased, the pitch diameter of the connecting bolt 300 is increased, the number of bolts is increased, the distribution diameter of the traction part 40 is increased, the load resistance of the root of the blade 2 is improved, and the load borne by the single connecting bolt 300 and the load borne by the rolling body of the variable pitch bearing 200 are reduced under the condition that the specification of the blade 2 is the same.

The embodiment of the invention also provides a wind generating set, which comprises the variable pitch system in any embodiment, so that the wind generating set has the same advantages as the variable pitch system, and the details are not repeated.

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

Claims

1. A transmission device capable of driving engagement with a traction member (40), comprising:

a support member (10);

a first rotating member (20) rotatably connected to the support member (10);

a tension pulley (30) connected to the support member (10) and provided at a distance from the first rotating member (20), the tension pulley (30) and the first rotating member (20) being capable of being used in cooperation with the traction member (40);

an adjusting member (50) connected to the tension pulley (30) and the support member (10) and limiting a movement locus of the tension pulley (30) so that the tension pulley (30) can perform a self-adjusting reciprocating linear movement along a radial direction thereof between a first movement limit position and a second movement limit position with respect to the support member (10);

the movement locus of the tension pulley (30) and the extending direction of the traction member (40) between the tension pulley (30) and the first rotating member (20) are parallel to each other.

2. The transmission device according to claim 1, wherein the support member (10) comprises a fixed seat (11) and a support frame (12) connected to the fixed seat (11), the support frame (12) comprises a first support portion (121) and a second support portion (122) which are oppositely arranged, and the first rotating member (20) is rotatably connected with the support member (10) through the first support portion (121) and the second support portion (122).

3. The transmission according to claim 2, wherein the adjustment member (50) includes a first adjustment member (51) and a second adjustment member (52), the first adjustment member (51) being disposed between the tension pulley (30) and the first support section (121), and the second adjustment member (52) being disposed between the tension pulley (30) and the second support section (122).

4. The transmission according to claim 3, wherein the tension pulley (30) comprises a main body portion (31) and a first mounting portion (32) and a second mounting portion (33) at both ends of the main body portion (31), a first mounting groove (123) is provided on the first supporting portion (121), a second mounting groove (124) is provided on the second supporting portion (122), the first mounting portion (32) is disposed in the first mounting groove (123) and connected to each other by the first adjustment member (51), the second mounting portion (33) is disposed in the second mounting groove (124) and connected to each other by the second adjustment member (52), and the main body portion (31) can be pressed against the traction member (40).

5. The transmission device according to claim 4, wherein the first installation part (32) and the second installation part (33) are both columnar structures, a first rotary bearing (70) is arranged between the first adjusting part (51) and the first installation part (32), an inner ring of the first rotary bearing (70) is sleeved on the first installation part (32), a second rotary bearing (80) is arranged between the second adjusting part (52) and the second installation part (33), and an inner ring of the second rotary bearing (80) is sleeved on the second installation part (33).

6. The transmission according to claim 4, wherein the first mounting portion (32) and the second mounting portion (33) are both of a guide block structure, the first mounting groove (123) and the second mounting groove (124) are both of a strip-shaped groove extending along the movement locus of the tension pulley (30), and the guide block structure is capable of reciprocating linearly along the corresponding strip-shaped groove.

7. The transmission device according to any one of claims 4 to 6, wherein the main body portion (31) comprises a roller (311) and a sleeve (312) sleeved on the outer peripheral surface of the roller (311), the roller (311) is integrally formed with the first mounting portion (32) and the second mounting portion (33), a third rotary bearing (90) is arranged between the sleeve (312) and the roller (311) so as to enable the sleeve (312) to be rotatably connected with the roller (311), and the main body portion (31) can be pressed on the traction component (40) through the sleeve (312).

8. Transmission according to any of claims 1 to 6, characterized in that said adjustment means (50) comprise an elastic element.

9. The transmission of claim 8, wherein the resilient member comprises a spring damper.

10. A pitch system for a wind power plant comprising a hub (1) and blades (2), characterized in that it comprises:

a drive member;

the variable-pitch bearing (200) comprises a fixed ring (202) and a rotating ring (201), wherein the fixed ring (202) is connected to the hub (1);

a second rotating member (60) that connects the rotating ring (201) and the blade (2);

a transmission according to any one of claims 1 to 9, said first rotary member (20) being connected to an output of said drive member; and

the traction component (40) is in transmission fit with the first rotating component (20) and the second rotating component (60) so as to drive the blade (2) to pitch;

wherein the tension pulley (30) is crimped to the traction member (40) to apply tension to the traction member (40).

11. A pitch system according to claim 10, wherein said second rotational member (60) is an extension of said rotating ring (201) extending axially along said pitch bearing (200), said extension being in driving engagement with said traction member (40).

12. A pitch system according to claim 10, wherein said second rotating member (60) is a root of said blade (2), said root of said blade (2) being in driving engagement with said traction member (40).

13. A pitch system according to claim 10, wherein the second rotational member (60) is a transition disc connected between the rotating ring (201) and the blade (2), the transition disc comprising an annular member (62) arranged around the pitch bearing (200) axis, the traction member (40) being in driving engagement with an outer circumferential surface of the annular member (62).

14. A wind park comprising a pitch system according to any of claims 10 to 13.