CN218624497U

CN218624497U - Worm transmission type variable pitch driving device and wind generating set

Info

Publication number: CN218624497U
Application number: CN202223251560.3U
Authority: CN
Inventors: 崔新维; 崔逸南; 郭欣鹏
Original assignee: Suzhou Xinsanli Wind Power Technology Co ltd
Current assignee: Suzhou Xinsanli Wind Power Technology Co ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-03-14
Anticipated expiration: 2032-12-06

Abstract

The utility model discloses a worm drive formula becomes oar drive arrangement. At least comprises a driving unit (1), a power splitting mechanism (2) and a worm transmission unit (3). The power dividing mechanism (2) comprises a driving gear (2.1) and at least two driven gears (2.2). The driving unit (1) drives the power distribution mechanism (2), the power distribution mechanism (2) drives the worm transmission unit (3), and the worm transmission unit (3) drives the wind generating set blade (5) through the variable pitch bearing (4) to realize variable pitch. The device utilizes worm transmission to realize higher transmission ratio, and saves the cost of a variable pitch bearing gear ring and a reduction gearbox of a driving unit. Meanwhile, the worm transmission has the characteristics of only saying, and an additional braking mechanism is omitted. The device has simple structure and small occupied space, and is very suitable for the centralized variable pitch drive of small and medium-sized wind turbine generators.

Description

Worm transmission type 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 worm drive formula becomes 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. Modern wind generating sets adopt a variable speed and variable pitch operation mode, and when the wind speed reaches or exceeds the rated wind speed, the wind generating sets realize the adjustment of the rotating speed and the power output by controlling the pitch angle of the blades. The blade pitch-variable driving device is a core component of the wind generating set, and ensures the stable and safe operation of the set.

Due to the limitations of size and cost of the small wind generating set, a centralized pitch-variable driving scheme is generally adopted, namely, a set of pitch-variable driver is used for simultaneously driving two or more blades to realize pitch variation.

At present, a 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 a pin shaft or a connecting rod drags the root of a blade to complete partial circular motion. The variable pitch motor is generally required to be arranged inside a cabin, a screw rod penetrates through a rotating shaft of a generator to enter the inside of a hub, and a medium-sized wind generating set can be adopted. However, the above solution cannot be realized when the inner diameter of the generator shaft is insufficient or the inner dimension of the hub is insufficient.

Still another common centralized pitch control technical scheme is bevel gear transmission, and the rotation of one pitch control motor can be transmitted to the rotation along three different pitch control axis directions respectively. The obvious disadvantage of the scheme is that the transmission ratio of the bevel gear is low, and a large gear ring must be matched to realize a high transmission ratio, otherwise, the cost of the speed reducer of the variable pitch drive unit is greatly increased.

Disclosure of Invention

An object of the utility model is to provide a worm drive formula becomes oar drive arrangement to solve at least one technical problem who mentions in the background art.

In order to achieve the above object, a first aspect of the present invention provides a worm-drive pitch drive apparatus, which is characterized by at least comprising a drive unit, a power splitting mechanism, and a worm drive unit;

the power dividing mechanism at least comprises a driving gear and at least two driven gears;

the driving unit drives the power dividing mechanism;

the power distribution mechanism drives the worm transmission unit;

the worm transmission unit drives the blades of the wind generating set through a variable pitch bearing to realize variable pitch.

In a further technical scheme, the driving gear in the power splitting mechanism is connected with the output end of a driving motor in the driving unit or the output end of a speed reducer.

In a further technical solution, the driving gear in the power splitting mechanism is engaged with all the driven gears, and the power of the driving motor or the speed reducer can be transmitted to the driven gears through the driving gear.

And a worm in the worm transmission unit is connected with the driven gear through a bolt or a key.

In a further technical scheme, two ends of the worm are provided with rotating bearings for supporting the worm and the driven gear to rotate.

In a further technical scheme, a bearing seat of the rotating bearing is connected with the inner wall of a hub of the wind generating set; and the shell of the driving unit is connected with the hub of the wind generating set or the inner wall of the main shaft or the rotating shaft of the generator.

The rotation axis of the worm wheel in the worm transmission unit is the same as or parallel to the pitch axis of the blade.

In a further technical scheme, the worm wheel is connected with a variable-pitch bearing rotating ring of the wind generating set through a rotating shaft or directly, and the root of the blade is connected with the variable-pitch bearing rotating ring.

In a second aspect, a wind turbine generator is provided, and the wind turbine generator includes the worm transmission type pitch-controlled driving device.

The beneficial effects of the utility model are that: the characteristic that the rotation axes of a worm wheel and a worm are staggered in worm type transmission is utilized, and the power of one variable pitch motor is transmitted to the blade roots of the three blades through the power splitting unit. The worm type transmission unit can realize higher transmission ratio, and the cost of a variable pitch bearing gear ring and a reduction gearbox of the driving unit is saved. And the worm-type transmission unit has the self-locking characteristic, so that an additional braking mechanism is not needed. Meanwhile, the whole device is simple in structure, small in occupied space and very suitable for centralized variable pitch driving of small and medium-sized wind turbines.

Drawings

Fig. 1 is a schematic view of a worm drive type pitch drive device according to an embodiment of the present invention;

fig. 2 is a schematic view of a power splitting unit of the worm transmission type pitch-variable driving device according to the embodiment of the present invention;

fig. 3 is a schematic view of the connection between the worm and the driven gear of the worm transmission type pitch-controlled driving device of the embodiment of the present invention;

fig. 4 is a schematic view of a power transmission mechanism of a single blade of the worm transmission type pitch-variable driving device according to the embodiment of the present invention;

fig. 5 is a schematic view illustrating connection between a worm wheel and a root of a blade of the worm transmission type pitch-controlled driving device according to the embodiment of the present invention;

fig. 6 is a schematic view of the arrangement of the worm transmission type pitch-controlled driving device in the wheel hub according to the embodiment of the present invention;

fig. 7 is the utility model discloses worm drive formula becomes oar drive arrangement global schematic diagram.

The reference numbers indicate:

1. the driving unit, 1.1, driving motor, 1.2, speed reducer, 1.3, speed reducer output shaft, 2, power split unit, 2.1, driving gear, 2.2, driven gear, 2.3, key slot hole, 3, worm transmission unit, 3.1, worm, 3.2, worm wheel, 3.3, rolling bearing, 3.4, worm wheel driven shaft, 4, variable pitch bearing, 5, blade, 5.1, variable pitch axis, 6, hub, 7, main shaft.

It is noted that the above-described figures are intended to illustrate the features of the invention and are not intended to show any actual structure or to reflect the details of the dimensions, relative proportions, etc. 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 pose any inconvenience to those skilled in the relevant art in understanding the present invention, and actual embodiments may include more modules or components.

Detailed Description

For making the purpose and technical solution of the embodiments of the present invention clearer, the following description is combined with the relevant drawings of the embodiments of the present invention to perform a complete description of the embodiments of the present invention. This patent describes only some 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.

The worm transmission type variable pitch driving device mainly comprises a driving unit (1), a power splitting mechanism (2) and a worm transmission unit (3).

As shown in fig. 1, the power splitting mechanism (2) is composed of one driving gear (2.1) and three driven gears (2.2), and the number of the driven gears (2.2) is the same as that of the blades (5). I.e. the number of driving vanes is required to be consistent with the number of power splitting branches.

As shown in fig. 2 and 3, the drive unit (1) drives the power split mechanism (2), and the power split mechanism (2) drives the worm drive unit (3).

As shown in fig. 4, finally, the blades (5) of the wind generating set are driven by the worm transmission unit (3) through the pitch bearing (4) to realize pitch variation.

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

a) The variable pitch controller issues a variable pitch instruction to the motor driver, the motor driver adjusts the rotating speed of the driving motor (1.1), the driving motor (1.1) is connected with the speed reducer (1.2) through the coupler, and the output shaft (1.3) of the speed reducer starts to rotate under the driving of the driving motor (1.1).

B) As shown in fig. 2, the middle parts of the driving gear (2.1) and the driven gear (2.2) in the power splitting unit (2) are both provided with a key slot hole (2.3). The output shaft (1.3) of the speed reducer and the driving gear (2.1) rotate coaxially, and the driving gear (2.1) and the driven gear (2.2) start to rotate under the driving of the output shaft (1.3) of the speed reducer.

C) The driven gear (2.2) and a worm (3.1) in the worm transmission unit (3) form coaxial rotation through a key groove hole (2.3); the worm wheel (3.2) starts to rotate under the drive of the worm (3.1), and finally the turbine (3.2) drives the blades (5) to rotate along the variable pitch axis (5.1).

D) The worm transmission type pitch-variable driving device finishes the process of simultaneously changing the pitch of all the blades.

The utility model provides a worm drive formula becomes oar drive arrangement's novelty and advantage are:

a) The characteristic that the rotation axes of the worm and the gear are staggered in worm type transmission is utilized, and the power of one pitch-variable motor is transmitted to the blade roots of the three blades through the power distribution unit.

B) The worm type transmission can realize higher transmission ratio, and the cost of a variable pitch bearing gear ring and a driving unit speed reducer is saved.

C) The worm type transmission has the self-locking characteristic (namely, the blades cannot freely rotate under the action of starting force), so that the variable pitch driving device does not need to be added with an additional braking mechanism (such as an electromagnetic band-type brake in a variable pitch motor).

D) The whole device is simple and compact in structure, small in occupied space and very suitable for centralized variable pitch driving of small and medium-sized wind turbines.

As shown in fig. 2, the driving gear (2.1) of the power split mechanism (2) is connected to the output shaft (1.3) of the speed reducer of the driving unit (1). In some embodiments, the driving gear (2.1) may also be connected to the output end of the driving motor (1.1), and whether to provide a speed reducer depends on the transmission ratio formed by the driving gear (2.1) and the driven gear (2.2) in the power splitting mechanism (2), and the transmission ratio formed by the worm (3.1) and the worm wheel (3.2) in the worm transmission unit (3) shown in fig. 1.

As shown in figure 2, a driving gear (2.1) and all driven gears (2.2) in the power splitting mechanism (2) adopt a straight gear direct meshing mode, the mode is simple and reliable, and in some embodiments, a gear can be added or a helical gear scheme can be adopted.

As shown in figure 3, the worm (3.1) in the worm transmission unit (3) is connected with the driven gear (2.2) through a key. In some embodiments, the worm (3.1) and the driven gear (2.2) can be connected in other ways, such as a bolt connection, a pin connection and other detachable connection ways.

As shown in fig. 3, 4 and 5, the two ends of the worm (3.1) are provided with the rotating bearings (3.3), and the worm (3.1) penetrates through the driven gear (2.2), so the rotating bearings (3.3) at the two ends can be used for supporting the worm (3.1) and the driven gear (2.2) to rotate simultaneously.

As shown in fig. 6, bearing seats of the rotating bearings (3.3) at both ends of the worm (3.1) are respectively fixed on the inner wall of the hub (6) of the wind generating set. In some embodiments, when the size of the hub is increased, considering that the span of the two ends of the worm (3.1) is not too large, a mounting surface can be separately arranged inside the hub to provide support for the rotating bearing (3.3), and the bearing seat of the rotating bearing (3.3) is not always directly connected with the inner wall of the hub (6).

The drive unit (1) affects the axial length of the hub and thus the overhang of the impeller. Therefore, all or part of the drive unit (1) can be arranged inside the main shaft (7) or the rotating shaft of the generator under the condition that the conditions allow. In some embodiments, if the main shaft (7) or the generator rotating shaft is insufficient, the axial length of the hub can be properly increased, and the shell of the driving unit (1) is connected with the inner wall of the hub (6).

As shown in fig. 5 and 7, the rotation axis of the worm wheel (3.2) is the same as the pitch axis (5.1) of the blade (5), i.e. the blade (5) and the worm wheel (3.2) rotate coaxially. In some embodiments, it cannot be guaranteed that the rotation axis of the worm wheel (3.2) is the same as the pitch axis (5.1) of the blade (5) due to the transmission ratio. However, in this case, the rotational axis of the worm wheel (3.2) and the pitch axis (5.1) of the blade (5) should satisfy a parallel constraint, so that the power transmission can be accomplished by an additional gear transmission.

As shown in fig. 7, the worm wheel (3.2) is connected with a rotating ring of a variable pitch bearing (4) of the wind generating set through a rotating shaft (3.4). In some embodiments, if the worm wheel (3.2) is close enough to the root of the blade (5), bolt holes matched with the rotating ring of the variable-pitch bearing (4) can be arranged on the worm wheel, and bolt connection is achieved.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up" and "down" and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but 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 in specific cases to 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 worm transmission type variable pitch driving device is characterized by at least comprising a driving unit (1), a power splitting mechanism (2) and a worm transmission unit (3);

the power splitting mechanism (2) at least comprises a driving gear (2.1) and at least two driven gears (2.2);

the driving unit (1) drives the power splitting mechanism (2);

the power dividing mechanism (2) drives the worm transmission unit (3);

the worm transmission unit (3) drives the blades (5) of the wind generating set to change the pitch through a pitch bearing (4).

2. The worm-drive pitch drive device according to claim 1, characterized in that the driving gear (2.1) in the power splitting mechanism (2) is connected to the output of the driving motor (1.1) or the output of the speed reducer (1.2) in the drive unit (1).

3. The worm-drive type pitch drive device according to claim 2, wherein the driving gear (2.1) in the power splitting mechanism (2) is meshed with all the driven gears (2.2), and the power of the driving motor (1.1) or the speed reducer (1.2) can be transmitted to the driven gears (2.2) through the driving gear (2.1).

4. The worm drive pitch drive according to claim 1, wherein the worm (3.1) in the worm drive unit (3) is bolted or keyed to the driven gear (2.2).

5. The worm drive pitch drive according to claim 4, characterized in that both ends of the worm (3.1) are provided with a rotational bearing (3.3) for supporting the worm (3.1) and the driven gear (2.2) in rotation.

6. The worm drive type pitch drive device according to claim 5, characterized in that a bearing seat of the rotating bearing (3.3) is connected with the inner wall of a hub (6) of a wind generating set; the shell of the driving unit (1) is connected with a hub (6) or a main shaft (7) of a wind generating set or the inner wall of a rotating shaft of a generator.

7. A worm-drive pitch drive according to claim 1, characterized in that the axis of rotation of the worm gear (3.2) in the worm drive unit (3) is the same as or parallel to the pitch axis (5.1) of the blade (5).

8. The worm drive type pitch drive device according to claim 7, characterized in that the worm wheel (3.2) is connected with a pitch bearing (4) rotating ring of a wind generating set through a rotating shaft (3.4) or directly, and the root of the blade (5) is connected with the pitch bearing (4) rotating ring.

9. A wind power plant comprising a worm driven pitch drive according to any of claims 1 to 8.