Yaw driving system and wind generating set

Abstract

The embodiment of the invention provides a yaw driving system and a wind generating set. The yaw driving system comprises a base, a yaw driving mechanism, a yaw driving mechanism and a yaw driving mechanism, at least two yaw driving units, wherein each yaw driving unit is arranged in one mounting hole; and each energy storage unit is connected with the at least one yaw driving unit and used for absorbing the rotating impact load borne by the connected yaw driving unit, and the energy storage units can further release energy to enable the yaw driving units to reset. According to the embodiment, the energy storage unit is used for absorbing the rotation impact load borne by the yaw driving unit, the torque generated when the yaw driving unit is impacted by wind power can be reduced, and therefore the probability that the yaw driving unit is damaged is reduced. In addition, the yaw driving unit and the base do not need to be connected through a plurality of bolts to provide anti-shearing force, and therefore convenience is provided for installation and maintenance of the yaw driving unit.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and in particular to a yaw drive system and a wind power generator set. Background Art

[0002] Wind energy is one of the most economically valuable renewable energy sources. At present, wind turbines (hereinafter referred to as wind turbines) have become the main equipment for wind energy utilization. The wind turbines absorb wind energy through wind rotors, use transmission systems to transfer wind energy to the generator shaft end, and then convert it into electrical energy through generators. A yaw system is connected between the nacelle and the tower, and the nacelle is rotated to a certain position and kept stable by the yaw drive system. When wind force acts on the unit, the yaw drive system needs to withstand the torque generated by it at the yaw position. Due to the large instantaneous changes in wind load and wind speed, the yaw limit torque has the characteristics of short duration and high peak value. When the yaw torque is too large, it may cause yaw flying or component damage. Therefore, in order to ensure the safety of the unit, bolts are used in the relevant technology to connect the yaw drive unit of the yaw drive system to the base. When facing the rotational impact load brought by the wind, the bolts are used to provide shear resistance, and in order to cope with rare extreme working conditions and extreme loads, the number of bolts is usually designed to be large, which causes cost waste. Moreover, since the bolts need to be removed when replacing or repairing the yaw drive unit, the assembly time and maintenance time will be increased. Summary of the invention

[0003] Therefore, an object of the present invention is to provide a yaw drive system and a wind turbine generator set to solve at least one of the problems existing in the above-mentioned prior art or related art.

[0004] A first aspect of the present invention provides a yaw drive system, comprising: a base having at least two mounting holes arranged in a circumferential direction of the base; at least two yaw drive units, each yaw drive unit being arranged in one mounting hole; and at least one energy storage unit, each energy storage unit being connected to at least one yaw drive unit and being used for absorbing the rotational impact load received by the connected yaw drive unit, and the energy storage unit being capable of releasing energy to reset the yaw drive unit.

[0005] A second aspect of the present invention provides a wind turbine generator set, comprising: a yaw drive system as described in the first aspect of the present invention; a nacelle, the nacelle being mounted on a base; a tower, a yaw mechanism being disposed on the tower, and a yaw drive unit being transmission-connected to the yaw mechanism.

[0006] The yaw drive system provided by the embodiment of the present invention uses an energy storage unit to absorb the rotational impact load on the yaw drive unit. Specifically, when the yaw drive unit is impacted by wind and is about to rotate or rotates, the rotational impact load is transmitted to the energy storage unit to store energy, which can reduce the torque generated by the yaw drive unit impacted by wind, thereby reducing the probability of damage to the yaw drive unit. In addition, there is no need to use multiple bolts to connect the yaw drive unit and the base to provide anti-shear force, thereby facilitating the installation and maintenance of the yaw drive unit.

[0007] The wind turbine generator set provided in the embodiment of the present invention has the yaw drive system provided in the embodiment of the first aspect, and thus has the beneficial effects provided in the embodiment of the first aspect, which will not be described in detail here.

[0008] Additional aspects and / or advantages of the present general inventive concept will be set forth in part in the following description and in part will be obvious from the description, or may be learned through practice of the present general inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and other objects and features of the present invention will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0010] Figure 1 A schematic structural diagram of a yaw drive system according to an embodiment of the present application is shown;

[0011] Figure 2 Shows Figure 1 A local enlarged schematic diagram of point I in the middle;

[0012] Figure 3 A partial side view schematic diagram of a yaw drive system according to an embodiment of the present application is shown;

[0013] Figure 4 A schematic structural diagram of an elastic member according to an embodiment of the present application is shown;

[0014] Figure 5 A partial top view schematic diagram of a yaw drive system according to another embodiment of the present application is shown;

[0015] Figure 6 A partial longitudinal cross-sectional schematic diagram of a yaw drive system according to an embodiment of the present application is shown;

[0016] Figure 7 A partial longitudinal cross-sectional schematic diagram of a yaw drive system according to another embodiment of the present application is shown.

[0017] Figures 1 to 7 Description of Figure Numbers:

[0018] 10 base, 110 mounting holes, 111 sinker,

[0019] 20 yaw drive unit, 210 driver, 220 reducer, 221 upper bearing, 222 lower bearing, 223 output shaft, 230 connecting platform, 231 mounting position, 240 boss, 250 annular boss,

[0020] 30 energy storage unit, 310 elastic member, 320 connecting shaft, 330 telescopic guide rod,

[0021] 410 baffle, 420 upper pad, 430 lower pad, 440 side pad. DETAILED DESCRIPTION

[0022] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be clear. For example, the order of operations described herein is only an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present application, except for operations that must occur in a specific order. In addition, for greater clarity and simplicity, the description of features known in the art may be omitted.

[0023] The features described herein can be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will be clear after understanding the disclosure of the present application.

[0024] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.

[0025] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions should not be limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer, or first portion referred to in the examples may also be referred to as the second member, second component, second region, second layer, or second portion.

[0026] In the specification, when an element such as a layer, a region or a substrate is described as being “on”, “connected to” or “coupled to” another element, the element may be directly “on”, “connected to” or “coupled to” another element, or one or more other elements may be present therebetween. Conversely, when an element is described as being “directly on”, “directly connected to” or “directly coupled to” another element, other elements may not be present therebetween.

[0027] The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprise", "include" and "have" indicate the presence of the described features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof. The term "plurality" represents any number of two and more than two.

[0028] The definitions of directional terms such as "above", "below", "top" and "bottom" in this application are based on the orientation of the product in normal use, unless otherwise specified.

[0029] Unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as those generally understood by ordinary technicians in the field to which the present invention belongs after understanding the present invention. Unless explicitly defined as such herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and the present invention, and should not be interpreted in an idealized or overly formal way.

[0030] In the current wind turbine generator set, the nacelle is connected to the tower through the yaw drive system. The yaw drive unit of the yaw drive system drives the nacelle to rotate relative to the tower to facilitate the impeller to face the wind. When the wind acts on the unit, the yaw drive unit needs to bear the torque generated by it at the yaw position. Due to the large instantaneous changes in wind load and wind speed, the yaw limit torque has the characteristics of short duration and high peak value. When the yaw torque is too large, it may cause yaw flying or component damage. In order to ensure the safety of the unit, the yaw drive unit is generally designed to have a large yaw capacity redundancy and structural strength redundancy, resulting in cost waste. Specifically, the current yaw drive unit is connected to the base through bolts, and the bolts provide shear resistance. In order to cope with rare extreme working conditions and extreme loads, the number of bolts is large, and there is a lot of redundancy in the configuration, which increases the cost. Moreover, the large number of bolts has a large construction torque and poor shear resistance. In addition, since multiple bolts need to be removed during replacement or maintenance, it will also cause assembly time loss and maintenance time loss.

[0031] Based on this, the embodiment of the present application provides a yaw drive system, which can reduce the torque generated by the yaw drive unit 20 and improve the safety of the yaw drive system by absorbing the rotational impact load of the yaw drive unit 20 through the energy storage unit 30, and eliminate the need for the above-mentioned multiple bolts, thereby reducing the excessive redundant design due to individual impact conditions. Figures 1 to 7 The yaw drive system and wind turbine generator set provided by the embodiments of the present invention are introduced.

[0032] like Figure 1 and Figure 2 As shown, a first aspect embodiment of the present application provides a yaw drive system, the yaw drive system comprising: a base 10, at least two mounting holes 110 are arranged in the circumference of the base 10; at least two yaw drive units 20, each yaw drive unit 20 is arranged in one mounting hole 110; at least one energy storage unit 30, each energy storage unit 30 is connected to at least one yaw drive unit 20, and is used to absorb the rotational impact load received by the connected yaw drive unit 20.

[0033] The yaw drive system provided by the embodiment of this aspect utilizes the energy storage unit 30 to absorb the rotational impact load received by the yaw drive unit 20. Specifically, when the yaw drive unit 20 is impacted by wind and wants to rotate or rotates, the rotational impact load is transmitted to the energy storage unit 30 to store energy, and the energy storage unit can provide a reaction force to the yaw drive, thereby effectively reducing the torque and rotation amplitude generated by the yaw drive unit 20 impacted by wind, thereby reducing the probability of damage to the yaw drive unit 20. Moreover, when the wind load and wind speed change greatly instantaneously, the energy storage unit 30 can absorb a large amount of rotational impact load, store more energy, and vice versa, can cope with rare extreme working conditions and extreme loads, and there is no need for the energy storage unit 30 to always maintain a large amount of energy storage state, reducing the excessive redundant design due to individual impact working conditions. Moreover, there is no need to use multiple bolts to connect the yaw drive unit 20 and the base 10 to provide shear resistance, which provides convenience for the installation and maintenance of the yaw drive unit 20.

[0034] Furthermore, the energy storage unit 30 can also release energy to reset the yaw drive unit 20, thereby preventing the yaw drive unit 20 from failing due to excessive rotation displacement.

[0035] Furthermore, at least one energy storage unit 30 is connected between at least two circumferentially adjacent yaw drive units 20. If two or more energy storage units 30 are connected between two circumferentially adjacent yaw drive units 20, the rotational impact load on the yaw drive unit 20 can be absorbed at the same time, and the absorption effect is good, so that the torque generated by the yaw drive unit 20 can be better reduced, and the yaw drive unit 20 can be prevented from being damaged.

[0036] Here, in the yaw drive system, at least one energy storage unit 30 may be connected between any two yaw drive units 20 adjacent to each other in the circumferential direction, or at least one energy storage unit 30 may be connected between some two yaw drive units 20 adjacent to each other in the circumferential direction. Figure 1 As shown in , the number of yaw drive units 20 is eight, which are divided into two groups, each group has four yaw drive units 20 , and in each group of yaw drive units 20 , two of them are connected together through the energy storage unit 30 .

[0037] Or further, at least one yaw drive unit 20 is connected to one end of at least one energy storage unit 30, and the other end of at least one energy storage unit 30 is connected to the base 10. Then each energy storage unit 30 is dedicated to absorbing the rotation impact load of one yaw drive unit 20, and the energy storage unit 30 has a better absorption capacity, which is conducive to coping with extreme working conditions and extreme loads.

[0038] Furthermore, in some embodiments, the energy storage unit 30 is detachably connected to the yaw drive unit 20. The yaw drive system can ensure the energy storage capacity of the energy storage unit 30 by reasonably designing the size, shape, and material of the energy storage unit 30, thereby reducing the failure probability of the yaw drive unit 20, and concentrating its main failure mode on the replaceable energy storage unit 30, facilitating replacement and maintenance, and increasing the service life of the yaw drive unit 20.

[0039] Regarding the specific structure of the energy storage unit 30, further, in some embodiments, as Figure 1 , Figure 2 and Figure 5 As shown, the energy storage unit 30 includes an elastic member 310 , which is connected to the yaw drive unit 20 . The elastic member 310 can be elastically deformed to absorb the rotation impact load on the yaw drive unit 20 .

[0040] In these embodiments, the elastic member 310 is connected to the yaw drive unit 20, and the elastic member 310 can play a similar effect to shock absorption. When the yaw drive unit 20 is pre-rotated or rotated by the impact of wind, the elastic member 310 can be deformed to inhibit the rotation of the yaw drive unit 20, which can not only absorb the rotation impact load acting on the yaw drive unit 20, but also release energy to generate a reaction force, thereby effectively reducing the rotation amplitude of the yaw drive unit 20 when facing the impact of wind, reducing the torque generated by the yaw drive unit 20, and avoiding damage to the yaw drive unit 20. Moreover, the yaw drive unit 20 can achieve dynamic balance under the action of wind force and the elastic force of the elastic member 310, ensuring that the yaw drive unit 20 will not rotate too much to cause yaw failure.

[0041] Moreover, the elastic deformation amplitude of the elastic member 310 will change according to the change of the absorbed rotational impact load. Even if there is a large instantaneous change in wind load and wind speed, or a rare extreme load under extreme working conditions, the elastic member 310 can also produce an elastic deformation of the corresponding amplitude, avoiding the occurrence of yaw or component damage, and without redundant shear resistance.

[0042] In a specific application, when the yaw drive unit 20 is rotated by wind impact, the yaw drive unit 20 will pre-rotate or rotate to transfer the rotation impact load to the elastic member 310, so that the elastic member 310 undergoes elastic deformation, thereby realizing energy storage of the elastic member 310. When the elastic member 310 undergoes elastic deformation, it can exert a reaction force on the yaw drive unit 20 according to its own elastic force, thereby releasing energy to reduce the rotation amplitude of the yaw drive unit 20 when facing wind impact, thereby reducing the torque generated by the yaw drive unit 20.

[0043] Furthermore, if Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the two ends of the elastic member 310 are connected to two circumferentially adjacent yaw drive units 20. When the two circumferentially adjacent yaw drive units 20 rotate under the action of wind, they will pull the elastic member 310, causing the elastic member 310 to elastically deform to absorb energy. In other words, the same elastic member 310 is used here to absorb the rotation impact load of the two yaw drive units 20, which reduces the number of parts and saves costs.

[0044] In a specific embodiment, Figure 2 and Figure 3 As shown, the elastic member 310 is an elastic bracket. The energy storage unit 30 further includes a connecting shaft 320, and both ends of the elastic bracket are rotatably connected to the yaw drive unit 20 through the connecting shaft 320.

[0045] In this embodiment, the elastic member 310 is an elastic bracket, which has a simple structure and low cost. Both ends of the elastic bracket are rotatably connected to the yaw drive unit 20 through the connecting shaft 320, and the two can rotate relative to each other. Even if two circumferentially adjacent yaw drive units 20 rotate, the elastic bracket can also adaptively rotate relative to the yaw drive unit 20 and perform corresponding elastic deformation, which can reduce the probability of the elastic bracket being pulled and damaged.

[0046] As an example, Figure 4As shown, the elastic bracket is in an X shape, and the two support rods at one end of the elastic bracket are connected to one yaw drive unit 20 through the connecting shaft 320, and the two support rods at the other end of the elastic bracket are connected to another yaw drive unit 20 through the connecting shaft 320. The X-shaped elastic bracket is more stable in deformation. When the yaw drive unit 20 rotates, the angle between the two support rods will increase or decrease. On the one hand, it has a good energy absorption effect, and on the other hand, it can stably provide a reaction force to the yaw drive unit 20, and will not cause the yaw drive unit 20 to fail to reset due to excessive deformation. In addition, the elastic bracket is connected to the same yaw drive unit 20 through two support rods, which is conducive to improving the connection stability between the elastic bracket and the yaw drive unit 20 on the one hand, and on the other hand, it is conducive to limiting the deformation amplitude of the elastic bracket and avoiding excessive deformation of the elastic bracket.

[0047] As an example, the elastic bracket is Y-shaped. At this time, the two support rods at one end of the elastic bracket can be connected to one yaw drive unit 20 through the connecting shaft 320, and the support rod at the other end can be connected to another yaw drive unit 20 through the connecting shaft 320.

[0048] As an example, the elastic bracket is in an S-shape. The elastic bracket can be stretched or compressed as the yaw drive unit 20 rotates, and the elastic bracket has a large elastic deformation and good elastic force.

[0049] The specific shape of the elastic bracket can be various and is not limited to the above examples.

[0050] Furthermore, if Figure 1 , Figure 2 and Figure 3 As shown, the outer periphery of the yaw drive unit 20 has a horizontally extending connection platform 230, and the elastic bracket is detachably connected to the connection platforms 230 of two adjacent yaw drive units 20. On the one hand, it is convenient to replace the elastic bracket to avoid the elastic force of the elastic bracket deteriorating after long-term use, which leads to the deterioration of its ability to absorb rotational impact loads. On the other hand, the elastic bracket is connected to the two horizontally extending connection platforms 230, and the elastic bracket is roughly placed horizontally between the two yaw drive units 20. When the yaw drive unit 20 rotates, the elastic bracket can be pulled or squeezed horizontally, which is conducive to deforming the elastic bracket along the set path, thereby ensuring that the elastic bracket accurately applies a reverse rotation reaction force to the yaw drive unit 20.

[0051] Furthermore, if Figure 1 and Figure 2As shown, a plurality of mounting positions 231 are spaced apart on the circumference of the connection platform 230, and the elastic bracket can be selectively connected to at least one mounting position 231 among the plurality of mounting positions 231. The elastic bracket is connected at different positions, and the elastic deformation amplitude is different, and the ability to absorb and release energy is different. Therefore, a plurality of mounting positions 231 are spaced apart on the circumference of the connection platform 230, so that it is convenient to select an elastic bracket of a suitable size according to the actual application scenario of the wind turbine generator set, and to select a mounting position 231 at an appropriate position to connect the elastic bracket, so that it meets the corresponding energy absorption needs without replacing the complete yaw drive system.

[0052] As an example, Figure 1 and Figure 2 As shown, the end of the elastic bracket is rotatably connected to the yaw drive unit 20 through the connecting shaft 320, the mounting position 231 is a connecting hole, the connecting shaft 320 can be rotatably passed through a connecting hole, and then the connecting shaft 320 is limited by a limiting member to limit the connecting shaft 320 from being separated from the connecting hole. The limiting member can be an insertion rod inserted into the insertion hole on the connecting shaft 320. The limiting member can also be a buckle, buckled on the buckle portion of the connecting shaft 320.

[0053] In another specific embodiment, Figure 5 As shown, the elastic member 310 is a spring, and the two ends of the spring are respectively connected or abutted between two circumferentially adjacent yaw drive units 20. The spring has good elasticity and restoring force, and can well absorb the rotation impact load on the yaw drive unit 20, and release energy to keep the yaw drive unit 20 in dynamic balance, reduce the torque generated by the yaw drive unit 20, and avoid damage to the yaw drive unit 20.

[0054] Furthermore, if Figure 5 As shown, the energy storage unit 30 further includes a first guide rod and a second guide rod, the first guide rod is sleeved on the outer periphery of the second guide rod and can move in the length direction of the second guide rod, the first guide rod and the second guide rod are configured as a retractable guide rod 330, the spring is sleeved on the retractable guide rod 330, one of the first guide rod and the second guide rod is arranged on one yaw drive unit 20, and the other is arranged on an adjacent yaw drive unit 20. The design of the retractable guide rod 330 facilitates guiding the spring to retract or extend along a set path, and avoids the spring from being bent and twisted and unable to effectively provide a reaction force to the yaw drive unit 20.

[0055] Furthermore, if Figure 5 As shown, two circumferentially adjacent yaw drive units 20 are provided with outwardly protruding bosses 240 on both sides facing each other, and the first guide rod and the second guide rod are provided on both sides opposite to each other of the two bosses 240. When the yaw drive unit 20 rotates, the spring is squeezed or stretched in a set direction, thereby facilitating the spring to retract or extend along a set path.

[0056] Regarding the specific structure of the energy storage unit 30, further, in other embodiments, the energy storage unit 30 includes a cylinder or a hydraulic cylinder. Here, the pressure in the cylinder or the hydraulic cylinder can be changed by rotating the yaw drive unit 20, so as to absorb the rotational drive load on the yaw drive unit 20, and when the pressure reaches the wind force, the yaw drive unit 20 is kept in dynamic balance, so that the yaw drive unit 20 can be prevented from rotating significantly, the torque generated by the yaw drive unit 20 can be reduced, and the probability of damage to the yaw drive unit 20 can be reduced.

[0057] Regarding the specific structure and configuration of the yaw drive unit 20, further, in some embodiments, as Figure 6 , Figure 7 As shown, the yaw drive unit 20 includes a reducer 220 and a driver 210 located above the reducer 220. The outer periphery of the reducer 220 is provided with an annular boss 250. The periphery of the mounting hole 110 is provided with a countersunk platform 111. The annular boss 250 is rotatably mounted on the countersunk platform 111. The yaw drive system also includes a baffle 410, which is connected to the base 10 by bolts, and limits the annular boss 250 between the countersunk platform 111 and the baffle 410.

[0058] In these embodiments, the base 10 is provided with a mounting hole 110, and a sinking platform 111 is arranged around the mounting hole 110. The annular boss 250 on the outer periphery of the reducer 220 is rotatably mounted on the sinking platform 111, which can effectively prevent the yaw drive unit 20 from falling without affecting the rotation of the yaw drive unit 20 under wind impact. The baffle 410 is connected to the base 10 by bolts, and the annular boss 250 is limited between the baffle 410 and the sinking platform 111, which can effectively prevent the yaw drive unit 20 from being separated from the base 10, and improve the installation stability of the yaw drive unit 20.

[0059] Here, since the bolts mainly serve to install the baffle 410, thereby preventing the annular boss 250 from detaching from the sink 111 from above, the bolts do not need to provide shear resistance, and only a small number of bolts need to be designed, which is conducive to reducing parts, saving costs, and greatly simplifying the torque construction. Moreover, when the yaw drive unit needs to be replaced or repaired, only a small number of bolts and baffles 410 need to be removed, and the yaw drive unit 20 can be pulled out of the mounting hole 110 upwards. The yaw drive unit 20 is easy to disassemble and assemble, which can reduce the disassembly and assembly time. Moreover, when the yaw drive unit 20 is installed, it can be operated from above the base 10, and there is no space requirement for maintenance from the side of the yaw drive unit 20, which facilitates maintenance and reduces the space requirement for the whole machine. In addition, when the yaw drive unit 20 is maintained, it only needs to check a small number of bolts connecting the baffle 410 and the base 10, and the inspection workload is greatly reduced.

[0060] As an example, the baffle 410 is two semi-annular structures, which are circumferentially pressed on the annular boss 250. After removing the bolts, the two semi-annular structures can be directly moved out horizontally, so as to facilitate taking the yaw drive unit 20 from the top. Of course, the baffle 410 can also be a non-closed annular structure or other structure, as long as it presses the annular boss 250 so that it will not move out and can be easily separated from the sink 111.

[0061] Furthermore, if Figure 6 As shown, the yaw drive system also includes: an upper pad 420, which is rotatably disposed between the upper surface of the annular boss 250 and the baffle 410; a lower pad 430, which is rotatably disposed between the lower surface of the annular boss 250 and the bottom wall of the sinker 111; and a side pad 440, which is rotatably disposed between the outer side surface of the annular boss 250 and the side wall of the sinker 111.

[0062] The use of sliding pads to limit the axial and radial degrees of freedom of the reducer 220, and the energy storage assembly to limit the circumferential degrees of freedom of the reducer 220, can make the reducer 220 rotate within a controllable range, thereby discharging the rotational impact load. Moreover, compared with the yaw drive unit 20 in the related art, the lower bearing 222 on the output shaft 223 of the reducer 220 can be omitted, and the sliding limit has lower requirements on the machining accuracy and lubrication of the components, which can reduce the machining difficulty of the reducer 220 and reduce its machining cost. In addition, the three sliding pads occupy a small space, so that the size of the mounting hole 110 on the base 10 will not be too large, which can reduce the machining difficulty and machining time.

[0063] The reducer 220 is also provided with an upper bearing 221 sleeved on the output shaft 223 to ensure that the output shaft 223 rotates smoothly.

[0064] In other embodiments, the yaw drive unit 20 includes a reducer 220 and a driver 210 located above the reducer 220; the yaw drive system further includes a rolling bearing, which is disposed between the outer periphery of the reducer 220 and the mounting hole 110. The yaw drive unit 20 is rotatably connected to the base 10 through the rolling bearing, and has a simple structure and few parts.

[0065] A second aspect of the present application provides a wind turbine generator set, comprising: a yaw drive system as in any one of the above embodiments; a nacelle, the nacelle being mounted on a base 10; a tower, a yaw mechanism being disposed on the tower, and a yaw drive unit 20 being transmission-connected to the yaw mechanism.

[0066] The wind turbine generator set provided in the embodiment of this aspect has the yaw drive system provided in any of the above embodiments, and thus has the beneficial effects provided in any of the above embodiments, which will not be described in detail here.

[0067] In addition, the yaw mechanism is used as the yaw execution component, and the yaw drive system realizes yaw by driving the yaw mechanism to execute the yaw action.

[0068] As an example, the yaw mechanism may include a ring gear and a driving gear. The ring gear is disposed on the tower. The driving gear is meshed with the ring gear and connected to the output shaft 223 of the yaw drive unit 20. The yaw drive unit 20 causes the driving gear to rotate along the ring gear to achieve yaw.

[0069] As an example, the yaw mechanism may also include a plurality of retractable rods, and the yaw drive unit 20 extends the plurality of retractable rods, and pushes the cabin to rotate a certain angle in the circumferential direction to achieve yaw. The retractable rods may be cylinders or hydraulic cylinders. In this case, the yaw drive system may not require the reducer 220 and the driver 210, and directly power on to extend or retract the cylinders or hydraulic cylinders. The retractable rods may also be transmission rods, and the driver 210 drives the retractable rods to extend or retract.

[0070] The following is a detailed description of a yaw drive system according to an embodiment of the present application.

[0071] The yaw drive system includes a driver 210, a reducer 220, a baffle 410, a base 10, an energy storage unit 30, an upper pad 420, a lower pad 430 and a side pad 440. The energy storage unit 30 includes a connecting shaft 320 and an elastic bracket.

[0072] Figure 1 The yaw drive system is mounted on a base 10 , and the yaw drive units 20 are connected in pairs through energy storage units 30 .

[0073] Figure 3 It is a structural schematic diagram of the yaw drive system of the present invention, including a yaw drive unit 20 composed of a driver 210 and a reducer 220, a structural limit composed of a base 10 and a baffle 410, which limits the reducer 220 up and down, and a hinged structure composed of an elastic bracket and a connecting shaft 320, which is hingedly connected to the yaw drive unit 20 to limit the yaw drive unit 20 in the circumferential direction. The elastic bracket has a certain elasticity due to its own shape and material properties. When the yaw drive unit 20 is subjected to a rotational impact load, the torque generated by the rotational impact load will be transmitted upward along the yaw drive unit 20 to the connecting shaft 320, causing the elastic bracket to produce elastic deformation and absorb the impact energy.

[0074] Figure 6This is the sliding system structure of the yaw drive unit 20 of this embodiment. The upper pad 420, the lower pad 430 and the side pad 440 constitute the limit of the reducer 220 in three directions. Compared with the current mainstream reducer 220 structure, it omits the lower bearing 222 of the output shaft 223 of the reducer 220, and reduces the bearing-related structure. Because the sliding structure has lower requirements on component processing accuracy and lubrication, the cost of the reducer 220 is greatly reduced. Because the space required for the sliding pad is smaller than that of the rolling bearing, the mounting hole 110 on the base 10 is also reduced, which can reduce the processing difficulty and processing time.

[0075] Figure 4 3 is a specific structural diagram of an elastic bracket. The elastic bracket can be replaced by a spring. The disadvantage of replacing with a spring is that a retractable guide rod 330 needs to be added, and the guide rod is easy to wear, which reduces the reliability of the system.

[0076] The yaw drive system proposed in this embodiment, in terms of installation, when installing the yaw drive unit 20, because there is no need to resist torque through bolt connection, the bolt connection between the reducer 220 and the base 10 is eliminated, and only a small number of bolts subjected to tensile force between the baffle 410 and the base 10 are retained, which greatly simplifies the torque construction and saves man-hours. In addition, the elastic bracket is hingedly connected to the reducer 220 of the yaw drive unit 20 through the connecting shaft 320. By reasonably designing the size, shape and material of the connecting shaft 320 and the elastic bracket, it can be easily disassembled and assembled from the top, thereby replacing the elastic bracket.

[0077] In terms of maintenance, when maintaining the yaw drive unit 20, it is only necessary to check a small amount of bolt torque between the baffle 410 and the base 10, and the inspection workload is greatly reduced. Moreover, by reasonably designing the size, shape and material of the elastic bracket, the probability of the elastic bracket losing its elastic force can be reduced, thereby reducing the failure probability of the yaw drive unit 20, so that the main failure forms are concentrated on the elastic bracket that is easy to replace, which is convenient for maintenance and replacement. In addition, when replacing the yaw drive unit 20, it is only necessary to remove the connecting shaft 320 and a small number of bolts. During installation, it can be operated from the top, and there is no space requirement for maintenance from the side of the reducer 220, which facilitates maintenance and reduces the space requirement for the entire machine.

[0078] The yaw drive system adopts sliding bearings to limit the axial and radial degrees of freedom of the reducer 220, and adopts elastic brackets to limit the circumferential degrees of freedom of the reducer 220, so that the reducer 220 can rotate within a controllable range, thereby dissipating the impact load, and can withstand relatively larger impact loads, greatly improving the adaptability of the yaw drive unit 20, and reducing excessive redundant designs due to individual impact conditions. The yaw drive system is light in weight, low in cost, and has a simple structure, which is easy to assemble and maintain. In addition, the use of sliding bearings to replace the bearings of the primary shaft of the reducer 220 can reduce the number of associated parts of the reducer 220, reduce the height of the reducer 220, and ultimately reduce the cost of the reducer 220. In addition, the yaw drive system greatly reduces the use of bolts, which can reduce the difficulty of installation and maintenance.

[0079] Of course, in other embodiments of the yaw drive system, the yaw drive units 20 may be connected in groups of three or more instead of two, or may be connected to the base 10 via an elastic bracket.

[0080] The yaw drive unit 20 may also adopt a double rolling bearing solution commonly used in the industry, such as Figure 7 As shown, the reducer 220 has an upper bearing 221 and a lower bearing 222 sleeved on the output shaft 223. After using this alternative, the connection between the reducer 220 and the base 10 can use sliding bearings, such as the upper pad 420, the lower pad 430 and the side pad 440 structure, or a rigid contact can be used.

[0081] The elastic bracket can be replaced by a spring, e.g. Figure 5 As shown, the advantage of this method is that one spring can provide circumferential buffering in two directions for two reducers 220 at the same time. Similarly, a spring can be added to each reducer 220, or even two springs, one clockwise and one counterclockwise, can be added to each reducer 220. Similarly, the spring can also be replaced by an elastic pressure rod, a cylinder or an oil cylinder using its elastic properties.

[0082] Although the embodiments of the present invention have been described in detail above, those skilled in the art may make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the present invention. It should be understood that, in the opinion of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention defined by the claims.

Claims

1. A yaw drive system, characterized in that: The yaw drive system comprises: A base (10), wherein at least two mounting holes (110) are arranged on the circumference of the base (10); at least two yaw drive units (20), each of the yaw drive units being arranged in one of the mounting holes (110); At least one energy storage unit (30), each of the energy storage units (30) being connected to at least one of the yaw drive units (20) and used for absorbing the rotational impact load exerted on the connected yaw drive unit (20), and the energy storage unit (30) being capable of releasing energy to reset the yaw drive unit (20).

2. The yaw drive system according to claim 1, characterized in that: At least one of the energy storage units (30) is connected between at least two yaw drive units (20) that are adjacent in the circumferential direction; or, At least one of the yaw drive units (20) is connected to one end of at least one energy storage unit (30), and the other end of the at least one energy storage unit (30) is connected to the base (10).

3. The yaw drive system according to claim 1 or 2, characterized in that: The energy storage unit (30) comprises an elastic member (310), the elastic member (310) is connected to the yaw drive unit (20), and the elastic member (310) can be elastically deformed to absorb the rotational impact load on the yaw drive unit (20).

4. The yaw drive system according to claim 3, characterized in that: Two ends of the elastic member (310) are connected to two yaw drive units (20) adjacent to each other in the circumferential direction.

5. The yaw drive system according to claim 4, characterized in that: The elastic member (310) is an elastic bracket, and the energy storage unit (30) further comprises a connecting shaft (320), and both ends of the elastic bracket are rotationally connected to the yaw drive unit (20) via the connecting shaft (320).

6. The yaw drive system according to claim 5, characterized in that: The elastic bracket is in an X shape, the two support rods at one end of the elastic bracket are connected to one of the yaw drive units (20) via the connecting shaft (320), and the two support rods at the other end of the elastic bracket are connected to another of the yaw drive units (20) via the connecting shaft (320); or The elastic support is Y-shaped; or The elastic bracket is S-shaped.

7. The yaw drive system according to claim 5, characterized in that: The outer periphery of the yaw drive unit (20) is provided with a horizontally extending connection platform (230), and the elastic bracket is detachably connected to the connection platforms (230) of two adjacent yaw drive units (20).

8. The yaw drive system according to claim 7, characterized in that: A plurality of mounting positions (231) are spaced apart in the circumferential direction of the connecting platform (230), and the elastic bracket can be selectively connected to at least one mounting position (231) among the plurality of mounting positions (231).

9. The yaw drive system according to claim 4, characterized in that: The elastic member (310) is a spring, and two ends of the spring are respectively connected or abutted between two circumferentially adjacent yaw drive units (20).

10. The yaw drive system according to claim 9, characterized in that: The energy storage unit (30) further comprises a first guide rod and a second guide rod, wherein the first guide rod is sleeved on the outer circumference of the second guide rod and is movable in the length direction of the second guide rod, the first guide rod and the second guide rod are configured as telescopic guide rods (330), the spring is sleeved on the telescopic guide rod (330), one of the first guide rod and the second guide rod is arranged on one of the yaw drive units (20), and the other is arranged on an adjacent yaw drive unit (20).

11. The yaw drive system according to claim 10, characterized in that: Outwardly protruding bosses (240) are arranged on two side surfaces facing each other of two yaw drive units (20) adjacent to each other in the circumferential direction, and the first guide rod and the second guide rod are arranged on two side surfaces opposite to each other of the two bosses (240).

12. The yaw drive system according to claim 1 or 2, characterized in that: The yaw drive unit (20) comprises a reducer (220) and a driver (210) located above the reducer (220); an annular boss (250) is provided on the outer periphery of the reducer (220); a sink (111) is provided on the periphery of the mounting hole (110); and the annular boss (250) is rotatably mounted on the sink (111); The yaw drive system further comprises a baffle (410), wherein the baffle (410) is connected to the base (10) via bolts, and the annular boss (250) is limited between the sink (111) and the baffle (410).

13. The yaw drive system according to claim 12, characterized in that: The yaw drive system further comprises: An upper gasket (420) rotatably disposed between the upper surface of the annular boss (250) and the baffle (410); A lower gasket (430) rotatably disposed between the lower surface of the annular boss (250) and the bottom wall of the sink (111); The side gasket (440) is rotatably arranged between the outer side surface of the annular boss (250) and the side wall of the sink (111).

14. A wind turbine generator set, characterized in that: The wind turbine generator set comprises: The yaw drive system according to any one of claims 1 to 13; A cabin, the cabin being mounted on the base (10); A tower is provided with a yaw mechanism, and the yaw drive unit (20) is in transmission connection with the yaw mechanism.

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