Patent Description:
The present application relates to the field of wind power generation devices, and in particular to a wind turbine pitch device and a wind turbine.

A wind turbine is a mechanism for converting wind energy into electrical energy, wherein a size of a pitch angle of a blade directly affects the wind energy absorbed by the wind turbine. In operation, the wind turbine needs to constantly adjust the pitch angle of the blade by determining the wind speed, so as to ensure that the wind turbine is in an optimal operating state, wherein the mechanism used to adjust the pitch angle of the blade is a pitch mechanism.

A typical pitch mechanism is a hydraulic pitch mechanism, wherein a hydraulic pressure is used as a power source of the mechanism, and a hydraulic cylinder adjusts the pitch angle of the blade by pushing a driving disk connected with a pitch bearing. One end of the hydraulic cylinder is fixedly mounted on a hub while the other end is mounted on the driving disk. The adjustment of the pitch angle of the blade is achieved through an expansion and contraction of the hydraulic cylinder.

Disadvantages of hydraulic pitch lies in, on the one hand, the filtering and replacement of hydraulic oil increases the maintenance cost of the wind turbine; on the other hand, the low-temperature fluidity of the hydraulic oil is poor, which is not suitable for the wind turbine to operate in a low-temperature environment; and moreover, some issues exist in the hydraulic pitch such as oil leakage of pipelines and joints require special protection for electrical equipment and cables, which increases costs.

<CIT> discloses a wind turbine drive device, particularly discloses an electric direct-driven wind turbine pitch device. The electric direct-driven wind turbine pitch device includes a hub, an outer ring of a pitch bearing and an inner ring of the pitch bearing. The outer ring of the pitch bearing is arranged on the hub. The inner ring of the pitch bearing is rotationally fitted with the outer ring of the pitch bearing. The electric direct-driven wind turbine pitch device further includes a linear drive structure and a connecting rod. The two ends of the linear drive structure are fixed to the hub; one end of the connecting rod is hinged to the linear drive structure, and the other end of the connecting rod is hinged to the inner ring of the pitch bearing. Linear motion provided by the linear drive structure is converted into rotation of the inner ring of the pitch bearing through the connecting rod and an installing rack.

The subject-matter of the invention is defined by the independent claim. The dependent claims define embodiments.

The present application may provide a wind turbine pitch device and a wind turbine to solve issues in wind turbines of the prior art, for example, high maintenance cost of hydraulic pitch, and oil leakage of hydraulic pipelines.

In one aspect, embodiments of the present application provide a wind turbine pitch device, which is used to control a pitch angle of a blade, the blade is mounted on a hub through a pitch bearing, and the wind turbine pitch device comprises:.

In another aspect, embodiments of the present application may further provide a wind turbine comprising the above described wind turbine pitch device.

The present application may provide a wind turbine pitch device and a wind turbine which may implement a pitching of the wind turbine, the structure may be simple, while it may not be required to drive a pitch system in a hydraulic manner. There may be no leakage and replacement of hydraulic oil, which may reduce a maintenance cost of the wind turbine, and oil-resistant electrical equipment and cables may not be required, thus the adaptability of the wind turbine may be better. Moreover, since a hydraulic control system may be no longer used, there may be no need to replace oil periodically and oil-resistant electrical equipment and cables may not be required, either, a constant low temperature set may be realizable.

The present application may be better understood from the following description of specific embodiments of the present application in connection with the accompanying drawings, wherein:.

By reading the following detailed description of non-limiting embodiments referring to the accompanying drawings in which the same or similar reference numerals represent the same or similar features, other features, objects and advantages of the present application will become apparent. <FIG> is a schematic diagram of a wind turbine pitch device provided by embodiments of the present application.

Features and exemplary embodiments of a variety of aspects of the present application will be described in detail below. In the following detailed description, many specific details are set forth to provide a comprehensive understanding of the present application. However, it is apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of embodiments is merely to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, well-known structures and techniques are not illustrated as so to avoid unnecessarily obscuring the present application.

Example embodiments will now be described more comprehensively with reference to the accompanying drawings. However, example embodiments may be practiced in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present application more comprehensive and complete, and fully convey the concepts of the example embodiments to those skilled in the art. In the drawings, the thicknesses of regions and layers may be exaggerated for clarity. The same reference numerals in the drawings present the same or similar structures, thus their detailed description will be omitted.

As shown in <FIG>, embodiments of the present application may provide a wind turbine pitch device <NUM> which may be used to control a pitch angle of a blade (not shown), the blade may be mounted on the hub <NUM> through a pitch bearing <NUM>, and the wind turbine pitch device <NUM> may comprise a disk driving structure <NUM>, a crank <NUM>, a connecting rod <NUM>, a slider <NUM>, a guide rail <NUM>, and a driving motor <NUM>.

Edges of the disk driving structure <NUM> may be fixedly mounted on the blade and perpendicular to an axis of the pitch bearing <NUM>; the edges of the disk driving structure 410may be fixed on the blade by means of screwing, welding and riveting, etc., and the disk driving structure <NUM> may be perpendicular to an axis of the pitch bearing 300so that the disk driving structure <NUM> may provide a support for the blade. During driving the disk driving structure <NUM> through the crank <NUM>, the disk driving structure <NUM> may apply torques to the blade in all directions simultaneously to cause the blade to pitch rotate relative to the hub <NUM>.

One end of the crank <NUM> may be fixedly connected to the disk driving structure 410so that the crank <NUM> will not move relative to the disk driving structure <NUM>, thereby the disk driving structure <NUM> may be better controlled to drive the blade to pitch.

One end of the connecting rod <NUM> may be hinged to the other end of the crank <NUM>. Through a hinged connection of the connecting rod <NUM> and the crank <NUM>, the crank <NUM> may be driven to rotate with the driving of the connecting rod <NUM>. Alternatively, the connecting rod <NUM> may be partially disposed inside the blade (i.e. a part of the connecting rod <NUM> may be disposed outside the blade), or may be fully disposed inside the blade.

The slider <NUM> that may be hinged to the other end of the connecting rod <NUM>. The slider <NUM>, the connecting rod <NUM> and the crank <NUM> may constitute a crank-slider structure, so as to drive the crank <NUM> to rotate by the movement of the slider <NUM>, and in turn, to drive the disk driving structure <NUM> to cause the blade to pitch rotate.

The guide rail <NUM> may be arranged on the hub <NUM> and sliding fit with the slider <NUM>. The guide rail <NUM> may be used to support the slider <NUM> and guide the movement of the slider, so that the slider <NUM> may move along the guide rail <NUM>.

The driving motor <NUM> may drive the slider <NUM> to move along the guide rail <NUM>. The driving motor <NUM> may be used to powering the pitch rotation of the blade, and may be a linear motor to drive directly or a forward-reverse rotating motor to drive through a linear driving mechanism (e.g., a lead screw).

When the wind turbine pitch device <NUM> is in operation, the slider <NUM> may be driven by the driving motor <NUM> to move along the guide rail <NUM>. During the movement of the slider <NUM> along the guide rail <NUM>, the crank <NUM> may be driven by the connecting rod <NUM> to rotate. The fixed connection of the crank <NUM> and the disk driving structure <NUM> may enable the crank <NUM> to drive the disk driving structure <NUM> to rotate, so as to control the blade to pitch.

Embodiments of the present application may provide a wind turbine pitch device which may implement a pitching of the wind turbine and have a simple structure, while it may not be required to drive a pitch system in a hydraulic manner. There may be no leakage and replacement of hydraulic oil, which may reduce a maintenance cost of the wind turbine, and oil-resistant electrical equipment and cables may not be required, thus the adaptability of the wind turbine may be better. Moreover, since a hydraulic control system may be no longer used, there may be no need to replace oil periodically and oil-resistant electrical equipment and cables may not be required, either, a constant low temperature set may be realizable.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, the disk driving structure 410may be fixedly mounted on a bearing race fixedly connected to the blade in the pitch bearing <NUM>. The bearing race may be either an outer ring <NUM> or an inner ring <NUM> of the pitching bearing <NUM>; through a connection with the pitch bearing <NUM>, the disk driving structure <NUM> may drive the blade to pitch rotate and provide support for the pitch bearing <NUM>, thereby the operation of the pitch bearing <NUM> may be more stable.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, since the connection between the blade and the pitching bear <NUM> may be implemented in two ways, i.e., through the outer ring <NUM> or the inner ring <NUM> of the pitch bearing <NUM>, when the outer ring 310of the pitch bearing <NUM> is fixedly connected to the blade, the disk driving structure <NUM> may connected to the outer ring <NUM> of the pitch bearing <NUM> accordingly; when the inner ring <NUM> of the pitch bearing <NUM> is fixedly connected to the blade, the disk driving structure <NUM> may be connected to the inner ring <NUM> of the pitch bearing <NUM>.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, one end of the crank <NUM> may be fixedly connected at a position on the disk driving structure <NUM> corresponding to the axis of the pitch bearing <NUM>,so that the position that the crank <NUM> drives the disk driving structure <NUM> may correspond to the axis of the pitch bearing <NUM>. The driving force applied by the disk driving structure <NUM> to the blade (in particular, the pitch bearing <NUM> connected to the blade) may be equal, in order to reduce a deformation of the blade (as well as the pitch bearing <NUM> connected to the blade), thereby the pitch rotation of the blade may be more smooth to prolong the life of the whole pitch baring <NUM>.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, the driving motor <NUM> may be a linear motor, and accordingly, the guide rail <NUM> may be a linear rail, and the two ends of the linear guide rail may be fixedly mounted on the hub <NUM> to support the slider <NUM> stably. The linear motor should also be fixed on the hub <NUM>, so that the linear motor may provide a driving force for the slider to enable the slider <NUM> to drive the crank <NUM> under a driving of the linear motor.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, the linear motor may be fixedly mounted on the linear guide rail. The driving direction of the linear motor may be the same as that of the linear guide rail, so that the linear motor may drive the slider <NUM> along the linear guide rail to provide a greater driving force for the slider.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, the driving motor <NUM> may be a forward-reverse rotating motor. The forward-reverse rotating motor may drive a lead screw fitting with the slider <NUM>. The driving motor <NUM> in this embodiment may be a forward-reverse rotating motor, which differs from the linear motor in that the forward-reverse rotating motor may only provide rotation and cannot drive linearly. To convert the rotation of the forward-reverse rotating motor into a linear driving, it may be required to connect a rotation axis of the forward-reverse rotating motor with the lead screw, and then a rotation of the lead screw may drive the slider <NUM> on the lead screw to move linearly to complete the pitch driving.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, the disk driving structure <NUM> may have a disk shape. Based on the understanding of those skilled in the art, the disk driving structure <NUM> may have regular disk shape or an irregular disk shape, for example, the edge of the disk may be provided with a convex connection portion uniformly, which may also considered as a disk; the disk may even be provided with several hollow structures to reduce the weight of the disk.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, the disk driving structure <NUM> may be provided with reinforcing ribs radially distributed around the center. By providing reinforcing ribs, the disk driving structure <NUM> may provide a more stable support to improve the deformation resistance of the disk driving structure <NUM>.

In the wind turbine pitch device <NUM> provided by embodiments of the present application, the disk driving structure <NUM> may be fixedly connected to the pitch bearing <NUM> by a bolt. Accordingly, it may be required to process bolt holes on the edge of the disk driving structure <NUM>. By fixedly connecting the disk driving structure <NUM> to the pitch bearing <NUM> directly through a bolt, the connection of the disk driving structure <NUM> and the pitch bearing <NUM> may be more stable, it may be not required to separately design corresponding connection components for connecting the disk driving structure <NUM>.

Embodiments of the present application may further provide a wind turbine comprising the wind turbine pitch device <NUM> provided by above embodiments. The wind turbine pitch device <NUM> may be set for each blade of the wind turbine (generally, three blades may be mounted on the hub of the set), and a corresponding control system may be designed to control the three blades to pitch rotate simultaneously.

Claim 1:
A wind turbine pitch device (<NUM>) used to control a pitch angle of a blade, the blade being mounted on a hub (<NUM>) through a pitch bearing (<NUM>), wherein the wind turbine pitch device (<NUM>) comprises:
a disk driving structure (<NUM>) that is fixedly mounted on the blade and perpendicular to an axis of the pitch bearing (<NUM>);
a crank (<NUM>), one end of which is fixedly connected at a position on the disk driving structure (<NUM>) corresponding to the axis of the pitch bearing (<NUM>);
a connecting rod (<NUM>), one end of which is hinged to the other end of the crank (<NUM>);
a slider (<NUM>) that is hinged to the other end of the connecting rod (<NUM>);
a guide rail (<NUM>) that is arranged on the hub (<NUM>) and sliding fits with the slider (<NUM>); and
a driving motor (<NUM>) that drives the slider (<NUM>) to move along the guide rail (<NUM>),
wherein the wind turbine pitch device is characterized in that:
when an outer ring (<NUM>) of the pitch bearing (<NUM>) is fixedly connected to the blade, the disk driving structure (<NUM>) is fixedly mounted on the outer ring (<NUM>) of the pitch bearing (<NUM>); and when an inner ring (<NUM>) of the pitch bearing (<NUM>) is fixedly connected to the blade, the disk driving structure (<NUM>) is fixedly mounted on the inner ring (<NUM>) of the pitch bearing (<NUM>),
the driving motor (<NUM>) is a linear motor, and accordingly, the guide rail (<NUM>) is a linear guide rail, and
the linear motor is fixedly mounted on the linear guide rail (<NUM>).