CN218816743U

CN218816743U - Centralized variable pitch driving device and wind generating set

Info

Publication number: CN218816743U
Application number: CN202223098665.XU
Authority: CN
Inventors: 崔逸南; 崔新维
Original assignee: Suzhou Xinsanli Wind Power Technology Co ltd
Current assignee: Suzhou Xinsanli Wind Power Technology Co ltd
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-04-07
Anticipated expiration: 2032-11-22

Abstract

The utility model discloses a centralized variable-pitch driving device. The variable-pitch driving device at least comprises a variable-pitch driver (1), a cylindrical cam (2) and a driven structure (3). The variable-pitch driver (1) is connected with the cylindrical cam (2) and coaxially rotates, and a spiral groove (2.1) is formed in the surface of the cylindrical cam (2). The number of the driven structures (3) is at least two, each driven structure (3) is provided with at least one driven deflector rod (3.1), and the driven deflector rods (3.1) can move in the spiral grooves (2.1). The driven structure (3) is connected with the root of each blade through a variable pitch bearing, and all the blades are synchronously changed in pitch under the driving of the cylindrical cam (2). The whole variable-pitch driving device has few parts and simple structure, and each part is easy to process. The risk of gear transmission broken teeth in the conventional technical scheme is eliminated, the power transmission reliability in the variable pitch drive is improved, and meanwhile, the cost of the device is reduced.

Description

Centralized variable pitch driving device and wind generating set

Technical Field

The utility model belongs to the technical field of wind power generation, concretely relates to centralized change oar drive arrangement and wind generating set.

Background

Wind power is a power generation mode with the greatest large-scale development value and commercial development prospect in the field of renewable energy sources, and available wind energy is widely distributed and has huge reserves in the global scope.

The wind generating set drives the main shaft to rotate by utilizing the blades, and the main shaft drives the rotating shaft of the generator to rotate so as to convert mechanical energy into electric energy. A modern conventional wind generating set adopts a variable-speed variable-pitch operation mode, the low wind speed section realizes variable-speed operation and final maximum wind energy capture by controlling electromagnetic torque, and the high wind speed section realizes constant rotating speed and constant power output by controlling the pitch angle of blades. A variable pitch driving device of the blade is a core component of a modern wind generating set, and directly determines the power output and the loading condition of the wind generating set.

The large-scale wind generating set can be provided with one set of variable pitch driving device for each blade due to the sufficient internal space of the hub, namely the independent variable pitch driving device, the variable pitch driving between each blade is not affected mutually, and the reliability of the variable pitch driving and the safety of the set are improved.

Compared with a large-scale wind generating set, the small-scale wind generating set has the advantages that the internal space of the hub is limited, and the scheme of an independent variable-pitch driving device cannot be adopted. Therefore, it is necessary to develop a centralized pitch drive device, i.e. one pitch drive drags two or more blades to pitch simultaneously.

At present, a relatively common centralized variable pitch driving device mainly adopts a screw rod to convert the circular motion of a motor into reciprocating motion in a linear direction, and drags the root of a blade to complete partial circular motion through a pin shaft or a connecting rod, for example, the technical scheme provided by patent 201180002326.2. This solution has several disadvantages: 1) The linear reciprocating motion can not avoid the tension of the rod piece, so that a certain risk of instability of the compression rod exists; 2) The blade root is dragged by the pin shaft or the connecting rod, so that reciprocating circular motion cannot be realized, and the requirement on angle change in a very small range, such as 0-90 degrees, can be met. Only for general blade pitching.

Besides the above technical solutions, there is also a bevel gear transmission solution, in which one driving bevel gear drives a plurality of driven bevel gears to rotate, and the driven bevel gears are connected with the blade roots to realize blade pitch control, for example, the technical solution proposed in patent 202022248159.9. The scheme can eliminate the limitation of the blade pitch angle, but the bevel gear is adopted, so that the problems of high cost, large occupied space and the like are caused.

Disclosure of Invention

An object of the utility model is to provide a ring gear removes fat device to solve at least one technical problem who mentions in the background art.

In order to achieve the above object, a first aspect provides a centralized pitch drive device, which is characterized by at least comprising a pitch driver, a cylindrical cam and a driven structure;

the variable-pitch driver is connected with the cylindrical cam and coaxially rotates; the surface of the cylindrical cam is provided with a spiral groove;

the number of the driven structures is at least two, each driven structure is provided with at least one driven deflector rod, and the driven deflector rods can move in the spiral grooves.

In a further technical scheme, the rotation axis of the cylindrical cam is perpendicular to the variable pitch axis of the blade of the wind generating set.

In a further technical scheme, the driven structure is connected with the root of the blade, and the driven structure and the blade can rotate around the variable pitch axis together, so that the blade is variable in pitch.

The shell of the variable pitch driver is connected with a hub or a main shaft of the wind generating set, and the output end of the variable pitch driver is connected with one end of the cylindrical cam.

In a further technical scheme, the part of the cylindrical cam provided with the spiral groove is positioned inside the hub of the wind generating set.

The driven structure is provided with a plurality of bolt holes, and the driven deflector rod is arranged at the first end of the driven structure; the second end of the driven structure, the pitch bearing of the blade and the root of the blade are connected through bolts.

In a further technical scheme, the variable pitch bearing of the blade comprises a rotating ring and a fixed ring, the rotating ring is connected with the second end of the driven structure, and the fixed ring is connected with the hub of the wind generating set.

And one end of the driven deflector rod moving in the spiral groove is provided with a roller for reducing the abrasion caused by the motion of the driven deflector rod.

The spiral groove is provided with a plurality of spiral grooves, and the spiral angles of all the spiral grooves are the same, so that the rotating speeds of all the driven structures are the same.

In a second aspect, a wind turbine is provided, which includes the centralized pitch driving device.

The beneficial effects of the utility model are that: by using the classic cylindrical cam mechanism for reference, the roller moves in the spiral groove of the cylindrical cam to drive the blade to do circular motion to realize pitch variation. The whole variable-pitch driving device has few parts and simple structure, and each part is easy to process. The risk of gear transmission broken teeth in the conventional technical scheme is eliminated, the power transmission reliability in variable pitch driving is improved, and meanwhile, the cost of the device is reduced.

Drawings

Fig. 1 is a schematic view of a centralized pitch drive apparatus according to an embodiment of the present invention;

fig. 2 is an installation schematic diagram of a pitch driver of a centralized pitch driving device according to an embodiment of the present invention;

fig. 3 is a schematic view illustrating a connection between a pitch driver and a cylindrical cam of the centralized pitch driving device according to the embodiment of the present invention;

fig. 4 is a schematic view of a cylindrical cam spiral groove of a centralized variable pitch drive device according to an embodiment of the present invention;

fig. 5 is a schematic view of a driven structure of a centralized pitch drive device according to an embodiment of the present invention;

fig. 6 is a schematic view illustrating a placement of a driven shift lever of a centralized pitch drive device in a spiral groove according to an embodiment of the present invention;

fig. 7 is a schematic view illustrating a connection between a driven structure of a centralized pitch-controlled driving device and a blade root according to an embodiment of the present invention.

The reference numbers indicate:

1. become oar driver, 1.1, become the oar motor, 1.2, reduction gear box, 1.3, the driver output, 2, the cylinder cam, 2.1, the spiral groove, 2.2, the cylinder cam axis of rotation, 3, the driven structure, 3.1, the driven driving lever, 3.101, the roller, 3.2, the bolt hole, 3.3, first terminal surface, 3.4, the second terminal surface, 4, wheel hub, 5, the main shaft, 6, become the oar bearing, 6.1, the bearing retainer plate, 6.2, the bearing rolling circle, 7, the blade root, 7.1, become the oar axis.

It is noted that the above-described drawings are intended to illustrate features of the invention and are not intended to show any actual structure or to reflect details of dimensions, relative proportions and the like of the various components. In order to more clearly demonstrate the principles of the present invention and to avoid obscuring the same in unnecessary detail, the examples in the figures have been simplified. These illustrations do not present an inconvenience to those skilled in the relevant art in understanding the present invention, and actual embodiments may include more modules or components.

Description of the preferred embodiment

In order to make the purpose and technical solution of the embodiment of the present invention clearer, the following description is combined with the relevant drawings of the embodiment of the present invention to carry out complete description on the embodiment of the present invention. This patent describes only a few embodiments and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in FIG. 1, the centralized variable pitch driving device mainly comprises a variable pitch driver (1), a cylindrical cam (2) and a driven structure (3).

Wherein the pitch drive (1) can comprise a motor drive, a pitch motor (1.1), a reduction gear box (1.2), a controller, a backup power supply and other parts. As shown in fig. 2 and fig. 3, the output end rotating shaft (1.3) of the pitch drive (1) can be fixedly connected with one end of the cylindrical cam (2) through a coupler and coaxially rotate. It is worth noting that the pitch motor (1.1) has a high rotation speed (usually above 1000 rpm) and a low pitch speed (e.g. 10 \65042;/s), so the reduction gearbox (1.2) is generally a necessary component. The output shaft of the reduction gear box (1.2) is different from the axis of the rotating shaft of the variable pitch motor (1.1), and is usually arranged eccentrically. Therefore, the coaxial rotation means that the output shaft of the reduction gear box (1.2) and the cylindrical cam (2) rotate coaxially.

As shown in fig. 3 and 4, the surface of the cylindrical cam (2) is provided with a spiral groove (2.1), and in some embodiments, the spiral groove (2.1) may be distributed over the entire surface of the cylindrical cam (2).

Generally, the wind generating set at least comprises two blades, each blade needs to be driven by the driven structure (3) to realize variable pitch rotation, and therefore at least two driven structures (3) are provided. As shown in fig. 5, at least one driven driver (3.1) is arranged in each driven structure (3), and the driven driver (3.1) can move along the guide of the spiral groove (2.1).

The driven structure (3) is connected with the root (7) of the blade, and the driven structure (3) and the blade can rotate around a variable pitch axis (7.1) together to finally realize blade variable pitch.

The utility model provides a centralized change oar drive arrangement realizes that all blades become the work flow of oar together as follows:

a variable pitch controller issues a variable pitch instruction to a motor driver, the motor driver controls a variable pitch motor (1.1) to rotate, and meanwhile, a reduction gear box (1.2) is driven by the variable pitch motor (1.1) to rotate, so that a cylindrical cam (2) starts to rotate coaxially;

the rotation of the cylindrical cam (2) causes the spiral groove (2.1) on the surface of the cylindrical cam to start rotating, and because one end of the driven deflector rod (3.1) is placed in the spiral groove (2.1), all the driven deflector rods (3.1) start to move under the guidance of the spiral groove (2.1)

Because the driven deflector rod (3.1) is fixedly connected with the driven structure (3), all the driven structures (3) start to rotate, and all the blades are driven to rotate;

and the centralized variable-pitch driving device finishes the variable-pitch flow of all the blades.

The utility model provides a centralized change oar drive arrangement's novelty and advantage are:

the gear transmission in the traditional variable-pitch device is avoided, the risk of tooth breakage in the transmission process is eliminated, and the reliability of the device is improved;

the device adopts the change from circular motion to circular motion, thereby avoiding the risk of instability of the pressure rod in the conversion process from circular motion to linear motion in other technical schemes;

the whole device contains few mechanical parts, and each part has a simple structure and is low in manufacturing, installation and maintenance cost.

As shown in fig. 2, the housing of the pitch drive (1) is a fixed end with respect to the blade, which is connected to the hub (4) or the main shaft (5) of the wind turbine.

As shown in fig. 2, in the present embodiment, the rotation axis of the cylindrical cam (2) is perpendicular to the pitch axis (7.1) of the wind turbine blade. And, in theory, the pitch axis (7.1) of all the blades intersects the axis of rotation (2.2) of the cylindrical cam (2) at a point.

In some embodiments, the helical groove (2.1) covers only part of the outer surface of the cylindrical cam (2). In this solution, it is necessary to say that the cylindrical cam (2) is mounted inside a portion of the hub (4) of the wind turbine generator set, provided with a helical groove (2.1), in order to enable the trajectory of the helical groove (2.1) to be fully used to drive the rotation of the driven dog (3.1).

As shown in fig. 6, since the driven deflector rod (3.1) needs to reciprocate in the spiral groove (2.1), and the driven deflector rod (3.1) and the spiral groove (2.1) are both metal parts, in order to reduce the abrasion of the driven deflector rod (3.1) and the spiral groove (2.1) in the movement, a roller (3.101) needs to be arranged at the end of the driven deflector rod (3.1) to convert the friction contact into rolling contact.

As shown in fig. 1 and 5, in some embodiments, the driven structure (3) may be a circular plate with a certain thickness, and the driven lever (3.1) is disposed at the first end (3.3) of the driven structure (3); as shown in fig. 7, a plurality of bolt holes (3.2) are formed in the circumferential direction of the driven structure (3), the second end (3.4) of the driven structure (3) is connected with the variable-pitch bearing (6) of the blade and the root (7) of the blade through bolts, wherein the variable-pitch bearing (6) comprises a rotating ring (6.2) and a fixing ring (6.1). In the connection of the variable pitch bearing (6), a rotating ring (6.2) of the variable pitch bearing of the blade is connected with the driven structure (3), and a fixed ring (6.1) of the variable pitch bearing of the blade is connected with the hub (4).

In a conventional cylindrical cam mechanism, the curved grooves of the cylindrical cam surface may be arranged in an uneven distribution according to the motion characteristics of the mechanism (such as linear motion of the push rod). In contrast, in the embodiment, in order to ensure the synchronization of speed and position when the blades are subjected to centralized pitch variation, when the same spiral groove (2.1) extends on the surface of the cylindrical cam (2), the spiral angle of the spiral groove (2.1) needs to be kept unchanged. And in order to make the driven structure (3) rotate more smoothly, a plurality of spiral grooves (2.1) can be arranged on the surface of the cylindrical cam (2), and the spiral angles of all the spiral grooves (2.1) are equal. Based on this arrangement, the rate of change of the pitch angle, i.e. the pitch rate, can only be changed by the rotational speed of the pitch motor (1.1).

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper and lower" and the like are the directions or positional relationships shown on the basis of the drawings, and are only for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

The terms "mounted, connected and connected" in the present application are to be understood broadly, unless otherwise explicitly stated or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

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

Claims

1. A centralized variable pitch driving device is characterized by at least comprising a variable pitch driver (1), a cylindrical cam (2) and a driven structure (3);

the variable-pitch driver (1) is connected with the cylindrical cam (2) and rotates coaxially;

the surface of the cylindrical cam (2) is provided with a spiral groove (2.1);

the number of the driven structures (3) is at least two, each driven structure (3) is provided with at least one driven deflector rod (3.1), and the driven deflector rods (3.1) can move in the spiral grooves (2.1).

2. A centralized pitch drive according to claim 1, wherein the axis of rotation (2.2) of the cylindrical cam (2) is perpendicular to the pitch axis (7.1) of the wind park blades.

3. A centralized pitch drive according to claim 2, wherein the driven structure (3) is connected to the root (7) of the blade, and the driven structure (3) and the blade are jointly rotatable about the pitch axis (7.1) for blade pitch.

4. A centralized pitch drive according to claim 1, wherein the housing of the pitch drive (1) is connected to the hub (4) or the main shaft (5) of a wind turbine, and the output (1.3) of the pitch drive (1) is connected to one end of the cylindrical cam (2).

5. A centralized pitch drive according to claim 4, wherein the part of the cylindrical cam (2) provided with the helical groove (2.1) is located inside the wind turbine hub (4).

6. A centralized pitch drive according to claim 3, wherein a plurality of bolt holes (3.2) are provided in the driven structure (3), and the driven deflector rod (3.1) is provided at the first end (3.3) of the driven structure; the second end (3.4) of the driven structure, the pitch bearing (6) of the blade and the root (7) of the blade are connected by bolts.

7. A centralized pitch drive according to claim 5 or 6, wherein the pitch bearing (6) of the blade comprises a rotating ring (6.2) and a stationary ring (6.1), the rotating ring (6.2) being connected to the second end (3.4) of the driven structure and the stationary ring (6.1) being connected to the wind turbine hub (4).

8. A centralized pitch drive according to claim 1, wherein the end of the follower lever (3.1) moving in the helical groove (2.1) is provided with a roller (3.101) for reducing wear caused by the movement of the follower lever (3.1).

9. A centralized pitch drive according to claim 1, wherein there are a plurality of said helical grooves (2.1), and the helix angle of all said helical grooves (2.1) is the same, so that the rotational speed of all said driven structures (3) is the same.

10. A wind park comprising a centralised pitch drive arrangement according to any of claims 1-9.