CN114427513A - Hydraulic pitch systems and wind turbines - Google Patents

Abstract

The invention relates to a hydraulic variable pitch system and a wind generating set, wherein the hydraulic variable pitch system is used for the wind generating set, the wind generating set comprises a hub and blades, and the hydraulic variable pitch system comprises: become oar bearing, including normal running fit's inner circle and outer lane, one of inner circle and outer lane is the rotating ring and is used for being connected with the blade, and the other one in inner circle and the outer lane is the retainer plate and is used for being connected with wheel hub, and the rotating ring is provided with the meshing tooth on the lateral wall face of self footpath keeping away from the retainer plate. And the driving component comprises a hydraulic motor and a variable pitch gear connected with the hydraulic motor, and the variable pitch gear is in transmission fit with the meshing teeth. A power source connected with the hydraulic motor and configured to provide a drive fluid to the hydraulic motor such that the hydraulic motor drives the pitch gear to rotate. The invention has the advantages of the hydraulic pitch control technology, can ensure that the driving torque of the blade is kept unchanged at different angles, and reduces the cost of the hydraulic pitch control system.

Description

Hydraulic pitch systems and wind turbines

technical field

The invention relates to the technical field of wind power, in particular to a hydraulic pitch system and a wind generator set.

Background technique

In the blade pitch of wind turbines, there are mainly gear pitch technology, toothed belt pitch technology and hydraulic pitch technology. The hydraulic pitch technology is easy to adjust, and the pitch of the wind turbine requires a fast response speed, small blade vibration, easier and reliable pitch control, and high pitch accuracy, so the hydraulic pitch technology is widely used.

Most of the existing hydraulic pitch technology adopts hydraulic cylinder drive structure. The pitch actuator has two or one hydraulic cylinder. As the pitch drive structure, the hydraulic cylinder can only realize the extension and retraction of the cylinder rod. Therefore, the hydraulic cylinder can only achieve linear reciprocating motion, which needs to be connected by the crank connecting rod mechanism. The linear reciprocating motion of the hydraulic cylinder itself is converted into clockwise and counterclockwise rotation of the blades.

The hydraulic cylinder is limited by the structure. When the driving blade is pitched in the range of 0° to 90°, the force arm value of the driving force arm of the hydraulic cylinder changes, so that the driving torque of the hydraulic cylinder at the 0° position of the blade is greater than that of the blade. The driving torque at 90°, if the wind turbine meets the driving torque of the blade at 90°, the pressure of the system will be very high, which will increase the cost of the hydraulic pitch system accordingly.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a hydraulic pitch system and a wind turbine. The hydraulic pitch system can have the advantages of the hydraulic pitch technology, and at the same time, it can ensure that the driving torque of the blades remains unchanged at different angles, reducing the hydraulic pitch system. the cost of.

On the one hand, according to an embodiment of the present invention, a hydraulic pitch system is proposed, which is used for a wind turbine. The wind turbine includes a hub and blades, and the hydraulic pitch system includes: a pitch bearing, including an inner ring and an outer ring that are rotatably matched , one of the inner ring and the outer ring is a rotating ring and is used to connect with the blades, the other of the inner ring and the outer ring is a fixed ring and is used to connect with the hub, and the rotating ring is radially away from the side wall surface of the fixed ring There are meshing teeth on it. The driving part includes a hydraulic motor and a pitch gear connected with the hydraulic motor, and the pitch gear is in driving cooperation with the meshing teeth. A power source is connected to the hydraulic motor and is configured to provide driving fluid to the hydraulic motor to cause the hydraulic motor to drive the pitch gear to rotate.

According to an aspect of the embodiment of the present invention, the driving component further includes a speed reducer, and the hydraulic motor is connected with the pitch gear through the speed reducer.

According to an aspect of the embodiment of the present invention, the hydraulic motor, the speed reducer and the pitch gear are arranged in succession along the axial direction of the driven pitch bearing, and the speed reducer is used to connect to the wheel hub.

According to one aspect of the embodiments of the present invention, the power source includes a hydraulic station and an energy storage assembly connected to the hydraulic station, the energy storage assembly is connected to the hydraulic motor, and the driving fluid provided by the hydraulic station is delivered to the hydraulic motor via the energy storage assembly.

According to an aspect of the embodiment of the present invention, the energy storage assembly includes an energy storage bracket, an accumulator and a valve group arranged on the energy storage bracket, the accumulator is connected to the valve group, and the energy storage assembly is connected to the hydraulic pressure through the valve group respectively. station and hydraulic motor connection.

According to an aspect of the embodiments of the present invention, the number of pitch bearings, driving components and energy storage assemblies is more than two, each of the pitch bearings, driving components and energy storage assemblies is a group, and the power source further includes a distributor , the hydraulic station is connected with the valve group of each energy storage assembly through the distributor.

According to an aspect of the embodiments of the present invention, the wind turbine further includes a nacelle base and a shafting structure, the shafting structure includes a rotating shaft and a fixed shaft, the fixed shaft is connected to the nacelle base, and the moving shaft is connected to the hub; hydraulic pitching The system also includes a rotary joint. The rotary joint includes a rotating sleeve and a fixed sleeve that communicate with each other and are rotatably matched. The fixed sleeve is used for connecting with the fixed shaft, and the rotating sleeve is used for connecting with the moving shaft. The hydraulic station can be arranged on the base of the engine room and communicated with the fixed sleeve. The rotating sleeve communicates with the distributor.

According to an aspect of the embodiment of the present invention, the hydraulic pitch system further includes a fixing frame, one end of the fixing frame is connected to the fixed shaft and the other end is cantilevered, and the fixing sleeve is connected to the fixing frame.

According to an aspect of the embodiment of the present invention, the hydraulic pitch system further includes a rocker arm and a shift fork, the rocker arm is used for connecting with the moving shaft, the shift fork is connected to the rotating sleeve, and the shift fork is at least partially inserted into the rocker arm and is connected with the rocker arm match.

On the other hand, an embodiment of the present invention also provides a wind power generator set, comprising: a nacelle base; a shafting structure arranged on the nacelle base, the shafting structure comprising a rotatably connected moving shaft and a fixed shaft, the fixed shaft is connected to the nacelle base; an impeller , including interconnected hub and blades, the hub is connected to the moving shaft; in the above-mentioned hydraulic pitch system, the fixed ring of the pitch bearing is connected to the hub, the rotating ring is connected to the blades, and the drive components are connected to the hub.

According to an aspect of the embodiment of the present invention, a support ear seat is arranged inside the hub, a through hole is arranged on the support ear seat, the hydraulic motor is arranged on one side of the support ear seat in the extending direction of the through hole, and the pitch gear is arranged on the support ear seat. The ear seat is on the other side of the extension direction.

According to an aspect of the embodiment of the present invention, the inside of the hub is further provided with an energy storage ear seat, and the power source is at least partially connected to the energy storage ear seat.

According to the hydraulic pitch system and the wind power generator set provided by the embodiments of the present invention, the hydraulic pitch system includes a pitch bearing, a driving component and a power source, and one of the inner ring and the outer ring of the pitch bearing is a fixed ring and the other is a fixed ring. For the rotating ring, the rotating ring can be connected with the blades and have meshing teeth, and the fixed ring can be connected with the hub. Since the driving part includes a hydraulic motor and a pitch gear connected with the hydraulic motor, and the pitch gear can be driven and matched with the meshing teeth on the rotating ring, and the power source is connected with the hydraulic motor and provides driving fluid to the hydraulic motor, so that the hydraulic motor can The pitch gear is driven to rotate, and then the rotating ring matched with the pitch gear transmission is driven to rotate relative to the fixed ring, so as to realize the pitch requirement of the blade. In addition, the pitch gear and the rotating ring are driven and cooperated by means of gear meshing, and the driving torque to the blade remains unchanged at different angles, thereby reducing the cost of the hydraulic pitch system.

Description of drawings

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

1 is a schematic structural diagram of a wind turbine according to an embodiment of the present invention;

Fig. 2 is the use state diagram of the hydraulic pitch system of one embodiment of the present invention;

Fig. 3 is the schematic diagram of the force arm when the hydraulic cylinder drives the blade pitch in the prior art;

Fig. 4 is the enlarged view of A place in Fig. 2;

5 is a schematic diagram of a partial structure from a perspective of a wind turbine according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a partial structure of a wind turbine according to an embodiment of the present invention from another perspective;

FIG. 7 is an enlarged view of B in FIG. 6 .

in:

10-pitch bearing; 11-inner ring; 12-outer ring; 13-mesh teeth;

20-drive parts; 21-hydraulic motor; 22-pitch gear; 23-reducer;

30-Power source; 31-Hydraulic station; 32-Energy storage assembly; 321-Energy storage bracket; 322-Accumulator; 323-Valve group; 33-Distributor;

40-rotating joint; 41-rotating sleeve; 42-fixing sleeve;

50-fixed frame;

60-rocker arm; 61-plug slot; 62-connection plate; 63-toggle plate;

70 - fork;

2-tower; 3-nacelle; 301-nacelle base; 4-shaft structure; 401-moving shaft; 402-fixed shaft; 5-impeller; 501-hub; 501a-support ear seat; 501b-energy storage ear seat ; 501c - through hole; 502 - blade.

In the drawings, the same components are given the same reference numerals. The drawings are not drawn to actual scale.

Detailed ways

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

The orientation words appearing in the following description are all the directions shown in the figures, and are not intended to limit the specific structure of the hydraulic pitch system and the wind turbine of the present invention. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or Connected integrally; either directly or indirectly. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

As shown in FIG. 1 and FIG. 2 , the wind turbine generator set provided by the embodiment of the present invention includes a tower 2, a nacelle 3, a generator (not shown), a shafting structure 4, an impeller 5 and a hydraulic pitch system. The tower 2 is connected to the foundation of the wind turbine, and the nacelle 3 is arranged on the top of the tower 2 . The nacelle 3 includes a nacelle base 301 , and the nacelle 3 can be connected to the tower 2 through the nacelle base 301 . The generator is installed in the nacelle 3 . In some examples, the generator may be located outside the nacelle 3 , and of course, in some examples, the generator may also be located inside the nacelle 3 .

The impeller 5 includes a hub 501 and a plurality of blades 502 connected to the hub 501 , and the blades 502 can rotate relative to the hub 501 . The shafting structure 4 includes a rotatably matched moving shaft 401 and a fixed shaft 402 . The fixed shaft 402 is connected to the nacelle base 301 , and the moving shaft 401 is connected to the impeller 5 , specifically the hub 501 of the impeller 5 . The generator includes a rotatably matched rotor and a stator, the rotor can be connected with the moving shaft 401 , and the stator can be connected with the fixed shaft 402 and/or the nacelle base 301 . When the wind acts on the blade 502, the blade 502 drives the hub 501 to rotate. Since the moving shaft 401 of the shafting structure 4 is connected to the hub 501, the moving shaft 401 can rotate relative to the fixed shaft 402, thereby driving the rotor to rotate relative to the stator to realize wind power generation. The power generation demand of the unit.

During the operation of wind turbines, in order to better obtain wind energy and convert it into electrical energy, pitch control technology is usually used to improve the wind turbine's ability to capture wind energy, improve the availability of wind turbines and generate electricity. quantity. In simple terms, the pitch control technology is to adjust the pitch angle of the blades 502 to change the angle of attack of the airflow on the blades 502 , thereby controlling the aerodynamic torque and aerodynamic power captured by the impeller 5 . The blade 502 needs to rotate relative to the hub 501 when pitching. In order to meet the rotational connection requirements between the hub 501 and the blade 502 , a corresponding pitch system needs to be equipped to realize the rotation of the blade 502 relative to the hub 501 .

Most of the existing pitch systems such as hydraulic pitch systems adopt a hydraulic cylinder drive structure. The pitch actuator has two or one hydraulic cylinder. As the pitch drive structure, the hydraulic cylinder can only realize the extension and retraction of the cylinder rod. Therefore, the hydraulic cylinder can only achieve linear reciprocating motion, which needs to be connected by the crank connecting rod mechanism. The linear reciprocating motion of the hydraulic cylinder itself is converted into clockwise and counterclockwise rotation of the vane 502 .

As shown in Figure 3, the hydraulic cylinder is limited by its structure. When the driving blade is pitched in the range of 0° to 90°, the output force F of the hydraulic cylinder is the same, but in different angle ranges, the force arm value of the hydraulic cylinder is the same. is variable, for example: when the angle of the blade 502 is 0°, the length of the hydraulic cylinder is L1, and the value of the lever arm is R1. When the angle of the blade 502 is 90°, the length of the hydraulic cylinder is L2, and the lever arm value of the hydraulic cylinder is the smallest and is R2. Since the force arm value of the driving force arm of the hydraulic cylinder varies, according to the driving torque T=FR, it can be known that the driving torque of the hydraulic cylinder of the blade 502 at 0° is greater than the driving torque of the blade 502 at 90°. Satisfying the driving torque T of the blade 502 at 90 degrees will make the pressure of the system very high, correspondingly increasing the cost of the hydraulic pitch system.

Based on the above technical problems, an embodiment of the present invention further provides a hydraulic pitch system, which has the advantages of the hydraulic pitch technology and can meet the rotation requirement between the blade 502 and the hub 501 . At the same time, it can ensure that the driving torque to the blades 502 remains unchanged at different angles, thereby reducing the cost of the hydraulic pitch system.

As shown in FIG. 2 and FIG. 4 , the hydraulic pitch system provided by the embodiment of the present invention includes a pitch bearing 10 , a driving component 20 and a power source 30 , and the pitch bearing 10 includes an inner ring 11 and an outer ring 12 that are rotatably matched. One of the inner ring 11 and the outer ring 12 is a rotating ring and is used to connect with the blades 502, the other of the inner ring 11 and the outer ring 12 is a fixed ring and is used to connect with the hub 501, and the rotating ring is radially away from itself. Meshing teeth 13 are arranged on the side wall surface of the fixing ring. The driving part 20 includes a hydraulic motor 21 and a pitch gear 22 connected with the hydraulic motor 21 , and the pitch gear 22 is in driving cooperation with the meshing teeth 13 . The power source 30 is connected to the hydraulic motor 21 and is configured to provide driving fluid to the hydraulic motor 21 so that the hydraulic motor 21 drives the pitch gear 22 to rotate.

In the hydraulic pitch system provided by the embodiment of the present invention, since the driving component 20 includes a hydraulic motor 21 and a pitch gear 22 connected to the hydraulic motor 21, and the pitch gear 22 can be driven and matched with the meshing teeth 13 on the rotating ring, the power The source 30 is connected to the hydraulic motor 21 and provides driving fluid to the hydraulic motor 21, so that the hydraulic motor 21 can drive the pitch gear 22 to rotate, and then drive the rotating ring that is driven by the pitch gear 22 to rotate relative to the fixed ring, so as to realize the variable speed of the blades 502. paddle needs. In addition, the pitch gear 22 and the rotating ring are driven and matched by means of gear meshing, and the driving torque to the blades 502 remains unchanged at different angles, thereby reducing the cost of the hydraulic pitch system.

Optionally, in the hydraulic pitch system provided by the embodiment of the present invention, in the pitch bearing 10, when the inner ring 11 is connected to the blade 502 and the outer ring 12 is connected to the hub 501, the inner ring 11 is a rotating ring, and the meshing teeth 13 is arranged on the inner wall surface of the inner ring 11, and the outer ring 12 is a fixed ring. When the outer ring 12 is connected to the blade 502 and the inner ring 11 is connected to the hub 501, the outer ring 12 is a rotating ring, the meshing teeth 13 are arranged on the outer wall of the outer ring 12, and the inner ring 11 is a fixed ring. In order to better understand the pitch system provided by the embodiment of the present invention, the following example uses the outer ring 12 as a fixed ring and the inner ring 11 as a rotating ring as an example for illustration.

As shown in FIGS. 2 and 4 , in some optional embodiments, the driving component 20 further includes a reducer 23 , and the hydraulic motor 21 is indirectly connected to the pitch gear 22 through the reducer 23 . By providing the speed reducer 23, the torque value of the hydraulic motor 21 can be amplified. Therefore, the hydraulic pitch system can select the hydraulic motor 21 with small specifications and sizes to meet the driving requirements of the blades 502 , the cost is low, the occupied space is small, and the hydraulic motor 21 is easy to disassemble and replace.

As an optional embodiment, the hydraulic motor 21 , the speed reducer 23 and the pitch gear 22 are successively arranged along the axial direction of the driven pitch bearing 10 , and the speed reducer 23 is used to connect to the wheel hub 501 . The hydraulic motor 21 , the reducer 23 and the pitch gear 22 are arranged in the above-mentioned arrangement. On the basis that the pitch gear 22 drives the inner ring 11 of the pitch bearing 10 to rotate relative to the outer ring 12 , the structure of the three is also arranged. Compact and easy to connect to the hub 501.

Optionally, the axial direction of the pitch gear 22 may be consistent with the axial direction of the driven pitch bearing 10 . The above arrangement facilitates the driving of the rotating ring of the pitch bearing 10 by the pitch gear 22 .

Optionally, the entirety of the hydraulic motor 21 , the speed reducer 23 and the pitch gear 22 may be connected to the hub 501 through the speed reducer 23 . When the inner ring 11 is a rotating ring, the hydraulic motor 21 , the speed reducer 23 and the pitch gear 22 can all be located inside the wheel hub 501 .

In some optional embodiments, in order to facilitate the installation of the hydraulic motor 21 , the reducer 23 and the pitch bearing 10 , a support ear seat 501 a is provided inside the hub 501 , and a through hole 501 c is provided on the support ear seat 501 a , and the hydraulic motor 21 The pitch gear 22 is disposed on one side of the support lug 501a in the extending direction of the through hole 501c, and the pitch gear 22 is disposed on the other side of the support lug 501a in the extending direction. The arrangement of the support lugs 501a can not only ensure the installation requirements of the reducer 23 and other components, but also can reduce the improvement of the structure of the hub 501, so that the structure of the hub is simple and the cost is low.

As an optional implementation, in the hydraulic pitch system provided in the embodiment of the present invention, the power source 30 includes a hydraulic station 31 and an energy storage assembly 32 connected to the hydraulic station 31 , the energy storage assembly 32 and the hydraulic motor 21 Connected, the driving fluid provided by the hydraulic station 31 is delivered to the hydraulic motor 21 via the accumulating assembly 32 . The energy storage assembly 32 may include an energy storage device in a hydropneumatic system. It can convert the energy in the system into compression energy or potential energy at an appropriate time and store it. When the system needs it, it can convert the compression energy or potential energy into hydraulic or pneumatic energy and release it to replenish the system. When the pressure of the system increases instantaneously, it can absorb this part of the energy to ensure the normal pressure of the whole system. The power source 30 adopts the above-mentioned structural form, which can not only meet the driving requirements of the hydraulic motor 21, but also ensure the overall safety performance of the hydraulic pitch system.

As shown in FIG. 5 , in some optional embodiments, the energy storage assembly 32 includes an energy storage bracket 321 , an accumulator 322 and a valve group 323 disposed on the energy storage bracket 321 , and the energy storage 322 and the valve group 323 is connected, and the energy storage assembly 32 is respectively connected with the hydraulic station 31 and the hydraulic motor 21 through the valve group 323 . The hydraulic oil in the hydraulic station 31 enters the hydraulic motor 21 through the valve group 323 , drives the hydraulic motor 21 to rotate, and then drives the pitch gear 22 to rotate. Optionally, the valve group 323 is provided with a directional control valve, the valve group 323 and the hydraulic motor 21 are connected by pipelines, and the directional control valve can control the flow direction of the high-pressure driving fluid entered by the hydraulic station 31, so as to realize the operation of the hydraulic motor 21. Clockwise rotation and counterclockwise rotation are performed to meet the rotation requirements of the blade 502 in the clockwise direction and the counterclockwise direction.

The correspondingly arranged accumulator 322 can be connected to the valve group 323 through a pipeline, and the high-pressure driving fluid can be stored in the accumulator 322. When the wind turbine generator encounters a fault, the high-pressure oil in the accumulator 322 is released. Push the hydraulic motor 21 to rotate to realize emergency feathering under failure.

Optionally, the energy storage support 321 may be a regular support structure. Optionally, the energy storage bracket 321 may include a plurality of profiles, and the profiles may be directly or indirectly connected as a whole. The energy storage bracket 321 adopts the above-mentioned structural form, which is low in cost, high in strength and light in weight. The energy storage bracket 321 may be provided with a fixing clip for the energy accumulator 322 to meet the fixing requirement of the energy accumulator 322 .

Optionally, the number of accumulators 322 included in the energy storage assembly 32 may be one, two or more, which may be specifically based on the specifications of the connected hydraulic motor 21, the model of the applied wind turbine, etc. The parameters are determined, and the specific quantity is not limited here.

Optionally, when the number of the included accumulators 322 is two or more, the two or more accumulators 322 located on the same energy storage bracket 321 are sequentially distributed along the same direction, which can reduce the size of the energy storage bracket 321 .

Optionally, the valve group 323 may be spaced apart from the accumulator 322 and connected to the accumulator 322 through a pipeline. The valve group 323 may be a collection of multiple control valves.

In some optional embodiments, the inside of the wheel hub 501 is further provided with an energy storage ear seat 501b, and the power source 30 is at least partially connected to the energy storage ear seat 501b. Optionally, the energy storage bracket 321 can be connected to the energy storage ear seat 501b, optionally, the energy storage bracket 321 and the energy storage ear seat 501b can be detachably connected. The disassembly and assembly of the hubs 501 can ensure the connection strength with the hubs 501 .

Optionally, each energy storage bracket 321 corresponds to two oppositely arranged energy storage ears 501b, and the energy storage ears 501b and the hub 501 can be connected to each other by welding. Of course, the energy storage ears can be adjusted by pitching The bearing 10 and the hub 501 are indirectly connected. The oppositely arranged energy storage ears 501b jointly support the energy storage bracket 321 of the energy storage assembly 32 . Optionally, the energy storage bracket 321 may be at least partially stacked on the energy storage ear seat 501b and detachably connected to the energy storage ear seat 501b through fasteners such as bolts.

As shown in FIG. 2 , FIG. 4 and FIG. 5 , as an optional implementation manner, the number of pitch bearings 10 , driving components 20 and energy storage assemblies 32 is more than two, and each pitch bearing 10 , The driving component 20 and the energy storage assembly 32 are a group, the power source 30 further includes a distributor 33 , and the hydraulic station 31 is connected to the valve group 323 of each energy storage assembly 32 through the distributor 33 . Since the number of blades 502 included in the impeller 5 is usually more than two, the number of the pitch bearing 10 , the driving part 20 and the energy storage assembly 32 is more than two, and the hydraulic station 31 is connected to the hydraulic station 31 through the distributor 33 . The connection of the valve groups 323 of the two energy storage assemblies 32 can ensure the driving requirements of each hydraulic motor 21 , thereby ensuring the pitching requirements of each blade 502 .

Alternatively, the distributor 33 may be provided within the hub 501 . In some embodiments, the distributor 33 may be connected to the energy storage bracket 321 of one of the energy storage assemblies 32 .

Optionally, when the hydraulic pitch system provided by the embodiment of the present invention is applied to the wind turbine to realize the pitch of the blades 502 , the hydraulic station 31 thereof may be arranged in the hub 501 .

As shown in FIG. 6 and FIG. 7 , when the size of the hydraulic station 31 is too large or the installation space is limited, the hydraulic station 31 may also be arranged on the nacelle base 301 . The hydraulic station 31 can be connected to the distributor 33 through pipelines, and the distributor 33 distributes the high pressure oil to the positions of the valve groups 323 of different energy storage assemblies 32 . Since the wheel hub 501 is connected with the nacelle base 301 through the shafting structure 4 , and the wheel hub 501 is rotated relative to the nacelle base 301 . When the hydraulic station 31 is installed on the nacelle base 301, if the hydraulic station 31 is directly connected to the distributor 33 through a pipeline, during the rotation of the impeller 5, the pipeline connected to the hydraulic station 31 will be at risk of entanglement, which will not be realized. The transmission of hydraulic oil from the hydraulic station 31 to the hub 501 part.

Therefore, in order to solve the above problems, the hydraulic pitch system provided by the embodiment of the present invention further includes a rotary joint 40, and the rotary joint 40 includes a rotary sleeve 41 and a fixed sleeve 42 that communicate with each other and are rotatably matched with each other. The fixed sleeve 42 is used for connecting with the fixed shaft. 402 is connected, and the rotating sleeve 41 is used for connecting with the moving shaft 401 . The hydraulic station 31 can be arranged on the nacelle base 301 and communicate with the fixed sleeve 42 , and the rotating sleeve 41 communicates with the distributor 33 . Through the above arrangement, the hydraulic station 31 is communicated with the fixed sleeve 42 through pipelines. Since the fixed sleeve 42 and the rotating sleeve 41 are rotatably matched, when the blade 502 drives the hub 501 to rotate, the hub 501 will drive the moving shaft 401 to rotate, and the rotating sleeve 41 is used to connect the moving shaft 401 and rotate with the fixed sleeve 42. The rotating sleeve 41 can rotate relative to the fixed sleeve 42 , avoiding the entanglement of the pipeline connected between the hydraulic station 31 and the fixed sleeve 42 , and simultaneously avoiding the entanglement of the pipeline connected between the rotating sleeve 41 and the distributor 33 . And the driving fluid delivered by the hydraulic station 31 can enter the fixed sleeve 42 through the pipeline and then enter the distributor 33 through the rotating sleeve 41 , and then be distributed to the valve group 323 of the energy storage assembly 32 through the distributor 33 .

Optionally, the dynamic sealing cooperation between the rotating sleeve 41 and the fixed sleeve 42 can not only ensure the relative rotation requirements between the two, but also further avoid the leakage of the driving fluid and ensure the safe and stable operation of the wind turbine.

In some optional embodiments, the hydraulic pitch system further includes a fixing frame 50 , one end of the fixing frame 50 is connected to the fixed shaft 402 and the other end is cantilevered, and the fixing sleeve 42 is inserted into the fixing frame 50 . By arranging the fixing frame 50 , the connection requirement between the fixing sleeve 42 and the fixed shaft 402 of the shafting structure 4 can be facilitated.

Optionally, the fixing frame 50 has a predetermined length. When the hydraulic pitch system is used for the wind turbine, the fixing frame 50 can extend in the radial direction of the shafting structure 4, and one end of the fixing frame 50 in the extension direction of the fixing frame 50 is connected to the fixed frame. The shaft 402 can optionally be fixedly connected to the fixed shaft 402 by welding, and of course, it can be detachably connected by fasteners such as bolts. The other end of the fixing frame 50 in the extending direction may be provided with an insertion hole, and the fixing sleeve 42 may be disposed opposite to the insertion hole and connected to the fixing frame 50 . Optionally, one end of the rotating sleeve 41 can be inserted into the fixed sleeve 42 and cooperate with the fixed sleeve 42 in a dynamic sealing manner, and the other end of the rotating sleeve 41 can pass through the insertion hole and protrude from the fixed frame 50 .

As an optional embodiment, the hydraulic pitch system further includes a rocker arm 60 and a shift fork 70 , the rocker arm 60 is used for connecting with the moving shaft 401 , the shift fork 70 is connected to the rotating sleeve 41 , and the shift fork 70 is at least partially inserted on the rocker arm 60 and cooperate with the rocker arm 60 . When the hydraulic pitch system is used in a wind turbine, the rocker arm 60 can be connected to the moving shaft 401 . When the hub 501 drives the moving shaft 401 to rotate, the moving shaft 401 will drive the rocker arm 60 to rotate. The shift fork 70 is at least partially inserted into the rocker arm 60 and is matched with the rocker arm 60 and the shift fork 70 is connected with the rotating sleeve 41, so that the rocker arm 60 can move the shift fork 70 to drive the rotating sleeve 41 to rotate relative to the fixed sleeve 42, that is, The installation of the rotating sleeve 41 and the matching requirements with the fixed sleeve 42 can be ensured, and the risk of entanglement between the pipelines can be avoided.

As an optional embodiment, the rocker arm 60 has a predetermined length, and one end of the rocker arm 60 in its length direction is provided with a connecting plate 62, which can be fixedly connected by welding between the connecting plate 62 and the moving shaft 401, and also It can be detachably connected by means of fasteners such as bolts. The rocker arm 60 is provided with a toggle plate 63 at the other end of its own length direction, the toggle plate 63 is provided with a plug-in slot 61, one end of the fork 70 is connected to the rotating sleeve 41, and the other end of the fork 70 is inserted into the plug-in connection Slot 61. In order to better ensure that the rocker arm 60 drives the rotating sleeve 41 to rotate when the follower shaft 401 rotates, the pipeline is prevented from being entangled.

It can be understood that the hydraulic pitch systems provided by the above embodiments of the present invention are all illustrated by taking the rotating ring as the inner ring 11 of the pitch bearing 10 and the fixed ring as the outer ring 12 of the pitch bearing 10 as examples. It is understood that this is an optional implementation. Of course, in some other embodiments, the outer ring 12 of the pitch bearing 10 can also be a rotating ring, and the inner ring 11 can be a fixed ring. At this time, the meshing teeth 13 are arranged on the outer ring 12 away from the inner ring 11 outer wall. Correspondingly, structures such as the hydraulic motor 21 , the pitch gear 22 and the reducer 23 can be arranged outside the hub 501 , as long as the drive requirements for the pitch bearing 10 can be met, the blades 502 can be pitched.

The pitch system provided by the embodiment of the present invention includes a pitch bearing 10 , a driving component 20 and a power source 30 , one of the inner ring 11 and the outer ring 12 of the pitch bearing 10 is a fixed ring and the other is a rotating ring The rotating ring can be connected with the blade 502 and has the meshing teeth 13 , and the fixed ring can be connected with the hub 501 . Since the driving part 20 includes a hydraulic motor 21 and a pitch gear 22 connected with the hydraulic motor 21, and the pitch gear 22 can be in driving cooperation with the meshing teeth 13 on the rotating ring, the power source 30 is connected with the hydraulic motor 21 and communicates with the hydraulic motor 21. 21 provides driving fluid, so that the hydraulic motor 21 can drive the pitch gear 22 to rotate, and then drive the rotating ring that is drivingly matched with the pitch gear 22 to rotate relative to the fixed ring, so as to realize the pitch requirement of the blade 502 . The pitch gear 22 and the rotating ring are driven and matched by gear meshing, and the driving torque to the blades 502 remains unchanged at different angles, thereby reducing the cost of the hydraulic pitch system.

In addition, the hydraulic motor 21 and the pitch gear 22 are used as the actuators of the pitch, or the hydraulic motor 21, the reducer 23, and the pitch gear 22 are used as the actuators of the pitch, not only the driving force arm is constant, but also has Larger drive arm values.

The correspondingly arranged reducer 23 cooperates with the form of the pitch gear 22, which can amplify the torque value by two thousand times or more, and can make the structure size of the hydraulic motor 21 small, so that the cost is far lower than the cost of the hydraulic cylinder, and the wind power is reduced. The cost of the generator set can be improved, and the cost performance of the product can be improved, thereby enhancing the competitiveness of the product. In addition, the hydraulic motor 21 is a mass-produced product with standard specifications, and its price is low. After years of verification, the cost is low and the failure rate is low. Further, the hydraulic motor 21 has a lower risk of external leakage compared to the driving mode of the hydraulic cylinder in the prior art, thereby improving the reliability of the wind turbine, improving the trouble-free running time, bringing about an increase in power generation, and improving economic benefits. .

Further, the hydraulic pitch system provided by the embodiment of the present invention integrates the advantages of hydraulic pitch, and requires a faster response speed than the motor-driven way of pitch pitch, the blade 502 has less vibration, and it is easier to perform reliable pitch pitch. Control, and pitch high precision, low cost, easy to popularize and use.

While the present invention has been described with reference to the preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (11)

1. A hydraulic pitch system for a wind generating set, the wind generating set comprising a hub (501) and blades (502), the hydraulic pitch system comprising:

the variable-pitch bearing (10) comprises an inner ring (11) and an outer ring (12) which are in running fit, one of the inner ring (11) and the outer ring (12) is a running ring and is used for being connected with the blades (502), the other of the inner ring (11) and the outer ring (12) is a fixed ring and is used for being connected with the hub (501), and meshing teeth (13) are arranged on the side wall surface of the running ring, which is far away from the fixed ring in the radial direction of the running ring;

the driving component (20) comprises a hydraulic motor (21) and a variable pitch gear (22) connected with the hydraulic motor (21), and the variable pitch gear (22) is in transmission fit with the meshing teeth (13);

a power source (30) connected to the hydraulic motor (21) and configured to provide a driving fluid to the hydraulic motor (21) such that the hydraulic motor (21) drives the pitch gear (22) in rotation.

2. The hydraulic pitch system according to claim 1, wherein the drive member (20) further comprises a speed reducer (23), and the hydraulic motor (21) is connected to the pitch gear (22) through the speed reducer (23).

3. A hydraulic pitch system according to claim 2, wherein the hydraulic motor (21), the reducer (23) and the pitch gear (22) are arranged one after the other in the axial direction of the driven pitch bearing (10), the reducer (23) being intended to be connected to the hub (501).

4. A hydraulic pitch system according to any one of claims 1-3, wherein the power source (30) comprises a hydraulic station (31) and an energy storage assembly (32) connected to the hydraulic station (31), the energy storage assembly (32) being connected to a hydraulic motor (21), the drive fluid provided by the hydraulic station (31) being conveyed to the hydraulic motor (21) via the energy storage assembly (32).

5. The hydraulic pitch system according to claim 4, wherein the energy storage assembly (32) comprises an energy storage bracket (321) and an energy storage device (322) and a valve group (323) which are arranged on the energy storage bracket (321), the energy storage device (322) is connected with the valve group (323), and the energy storage assembly (32) is respectively connected with the hydraulic station (31) and the hydraulic motor (21) through the valve group (323).

6. The hydraulic pitch system according to claim 5, wherein the number of the pitch bearing (10), the driving component (20) and the energy storage assembly (32) is more than two, each pitch bearing (10), the driving component (20) and the energy storage assembly (32) form a group, the power source (30) further comprises a distributor (33), and the hydraulic station (31) is connected with the valve group (323) of each energy storage assembly (32) through the distributor (33).

7. The hydraulic pitch system according to claim 6, wherein the wind power unit further comprises a nacelle base (301) and a shafting structure (4), the shafting structure (4) comprises a rotating-fit moving shaft (401) and a fixed shaft (402), the fixed shaft (402) is connected to the nacelle base (301), and the moving shaft (401) is connected to the hub (501);

the hydraulic pitch control system further comprises a rotary joint (40), the rotary joint (40) comprises a rotary sleeve (41) and a fixed sleeve (42) which are communicated with each other and are in running fit, the fixed sleeve (42) is used for being connected with the fixed shaft (402), the rotary sleeve (41) is used for being connected with the moving shaft (401), the hydraulic station (31) can be arranged on the base (301) of the engine room and communicated with the fixed sleeve (42), and the rotary sleeve (41) is communicated with the distributor (33).

8. The hydraulic pitch system of claim 7, further comprising a mount (50), wherein one end of the mount (50) is configured to be connected to the fixed shaft (402) and the other end is cantilevered, and wherein the fixture sleeve (42) is connected to the mount (50).

9. The hydraulic pitch system according to claim 7, further comprising a rocker arm (60) and a shift fork (70), wherein the rocker arm (60) is used for connecting with the moving shaft (401), the shift fork (70) is connected to the rotating sleeve (41), and the shift fork (70) is at least partially inserted into the rocker arm (60) and is matched with the rocker arm (60).

10. A wind turbine generator set, comprising:

a nacelle base (301);

the shafting structure (4) is arranged on the cabin base (301), the shafting structure (4) comprises a moving shaft (401) and a fixed shaft (402) which are rotatably connected, and the fixed shaft (402) is connected to the cabin base (301);

an impeller (5) including a hub (501) and blades (502) connected to each other, the hub (501) being connected to the moving shaft (401);

a hydraulic pitch system according to any of claims 1 to 9, wherein the stationary ring of the pitch bearing (10) is connected to the hub (501), the rotating ring is connected to the blade (502), and the drive member (20) is connected to the hub (501).

11. Wind park according to claim 10, wherein the hub (501) is internally provided with a support ear mount (501a), the support ear mount (501a) is provided with a through hole (501c), the hydraulic motor (21) is arranged on one side of the support ear mount (501a) in the extension direction of the through hole (501c), and the pitch gear (22) is arranged on the other side of the support ear mount (501a) in the extension direction;

and/or an energy storage lug seat (501b) is further arranged inside the hub (501), and the power source (30) is at least partially connected to the energy storage lug seat (501 b).

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