阅读说明：本技术 直驱风力发电装置 (Direct-drive wind power generation device ) 是由 鲁仰辉 李高盛 严帅 曹菡 卢华兴 于 2019-11-06 设计创作，主要内容包括：本发明公开了一种直驱风力发电装置,所述直驱风力发电装置包括：塔体,所述塔体包括塔架和设于塔架顶部的主机架,所述主机架的一侧形成为朝向所述塔体的中心轴线凹陷的电机安装部；发电机,所述发电机固定于所述电机安装部上,所述发电机的中心轴线在远离所述主机架的方向上向上倾斜延伸；和轮毂,所述轮毂与所述发电机相连且位于所述发电机的背离所述塔体的一侧。根据本发明的直驱风力发电装置,可以使发电机和轮毂的部分载荷直接作用于塔体上,减小塔体的向前的倾覆力矩,由此,可以减轻塔体重量,提高塔体的承载能力。(The invention discloses a direct-drive wind power generation device, which comprises: the tower body comprises a tower frame and a main frame arranged at the top of the tower frame, wherein a motor mounting part which is sunken towards the central axis of the tower body is formed on one side of the main frame; a generator fixed to the motor mounting part, a central axis of the generator extending obliquely upward in a direction away from the main frame; and the hub is connected with the generator and is positioned on one side of the generator, which deviates from the tower body. According to the direct-drive wind power generation device, partial loads of the generator and the hub can directly act on the tower body, and the forward overturning moment of the tower body is reduced, so that the weight of the tower body can be reduced, and the bearing capacity of the tower body is improved.)

1. A direct-drive wind power generation device, comprising:

the tower body comprises a tower frame and a main frame arranged at the top of the tower frame, wherein a motor mounting part which is sunken towards the central axis of the tower body is formed on one side of the main frame;

a generator fixed to the motor mounting part, a central axis of the generator extending obliquely upward in a direction away from the main frame; and

and the hub is connected with the generator and is positioned on one side of the generator, which deviates from the tower body.

2. The direct-drive wind power plant according to claim 1, wherein the angle between the central axis of the generator and the horizontal plane is not more than 30 °.

3. A direct drive wind power plant according to claim 1, characterized in that the angle between the central axis of the generator and the horizontal plane is in the range of 10 ° to 20 °.

4. The direct-drive wind power generation device according to claim 1, wherein the motor mounting portion is formed as a plate body extending obliquely upward in a direction from below to above toward a central axis of the tower body, the main frame further comprising: the arc wallboard, the arc wallboard extends and is along upper and lower direction and encircles the arc platelike that the central axis of tower body extends, the both ends along width direction of motor installation department respectively with the both ends along the circumferential direction of arc wallboard link to each other.

5. A direct-drive wind power plant according to claim 4, characterized in that the angle between the motor mounting section and the tower central axis is in the range of 10 ° to 20 °.

6. The direct-drive wind power plant according to claim 5, characterized in that the center axis of the generator is perpendicular to the outer side surface of the motor mounting portion.

7. The direct drive wind power plant of claim 4, wherein the main frame further comprises: the transition plate extends upwards and is connected to the lower end of the motor installation part from the center of the tower body in the upward direction, and the included angle between the transition plate and the horizontal plane is smaller than the included angle between the motor installation part and the horizontal plane.

8. A direct drive wind power plant according to any one of claims 1 to 7 wherein the tower is cylindrical, the main frame is formed at its lower end with a cylindrical connection to the tower, and the diameter of the connection is substantially equal to the diameter of the top of the tower.

9. Direct drive wind power plant according to any of claims 1 to 7, characterized in that the generator has a centre of gravity inside the tower in a horizontal projection plane.

10. A direct drive wind power plant according to claim 1 wherein the angle between the central axis of the hub and the horizontal plane is not more than 30 °.

Technical Field

The invention relates to the technical field of renewable energy equipment, in particular to a direct-drive wind power generation device.

Background

With the development of the wind driven generator technology, the structure of the wind driven generator tends to be large, the size of the engine room becomes larger and larger, for example, the length of the engine room of a 3MW double-fed unit reaches 15 meters, the length of the engine room of a 10MW double-fed unit reaches 20 meters, the height and the width of the engine room of the 10MW double-fed unit both reach 8 meters, the length of the engine room of a 5MW direct-drive unit also reaches 10 meters, the height and the width of the engine room both reach 6.5 meters, and. When the power exceeds 5MW, in order to reduce the size of the unit and reduce the weight and the cost, a direct drive unit is generally considered, namely a structure of a main shaft, a speed increasing box and a coupler without an intermediate transmission chain is adopted, and a wind wheel directly drives a generator. However, as the power of the unit is increased, a new problem is brought, namely, the generator needs more pole pairs due to too low rotating speed and large torque, so that the radial size of the generator is too large, the weight of the generator is large, and the weight of a tower and the foundation is continuously increased. There is therefore a need to reduce the weight of the tower and foundation by reducing the tower loads through various measures.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a direct-drive wind power generation device which is high in bearing capacity.

The direct-drive wind power generation device according to the present invention comprises: the tower body comprises a tower frame and a main frame arranged at the top of the tower frame, wherein a motor mounting part which is sunken towards the central axis of the tower body is formed on one side of the main frame; a generator fixed to the motor mounting part, a central axis of the generator extending obliquely upward in a direction away from the main frame; and the hub is connected with the generator and is positioned on one side of the generator, which deviates from the tower body.

According to the direct-drive wind power generation device, partial loads of the generator and the hub can directly act on the tower body, and the forward overturning moment of the tower body is reduced, so that the weight of the tower body can be reduced, and the bearing capacity of the tower body is improved.

In some embodiments, the angle between the central axis of the generator and the horizontal plane is no greater than 30 °.

In some embodiments, the angle between the central axis of the generator and the horizontal is in the range of 10 ° to 20 °.

In some embodiments, the motor mounting part is formed as a plate body extending obliquely upward toward a central axis of the tower body in a direction from bottom to top, and the main frame further includes: the arc wallboard, the arc wallboard extends and is along upper and lower direction and encircles the arc platelike that the central axis of tower body extends, the both ends along width direction of motor installation department respectively with the both ends along the circumferential direction of arc wallboard link to each other.

In some embodiments the angle between the motor mounting portion and the central axis of the tower is in the range of 10 ° to 20 °.

In some embodiments, a central axis of the generator is perpendicular to an outer side surface of the motor mounting portion.

In some embodiments, the mainframe further comprises: the transition plate extends upwards and is connected to the lower end of the motor installation part from the center of the tower body in the upward direction, and the included angle between the transition plate and the horizontal plane is smaller than the included angle between the motor installation part and the horizontal plane.

In some embodiments, the tower is cylindrical, and the main frame is formed at a lower end thereof with a cylindrical coupling portion coupled to the tower, and the coupling portion has a diameter substantially equal to a diameter of a top of the tower.

In some embodiments, the center of gravity of the generator is located inside the tower in a horizontal projection plane.

In some embodiments, the angle between the central axis of the hub and the horizontal plane is no greater than 30 °.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic view of a direct drive wind power plant according to an embodiment of the invention.

Reference numerals:

the direct-drive wind power generation device 100,

the tower comprises a tower body 1, a tower 11, a main frame 12, a motor mounting part 121, an arc-shaped wall plate 122, a transition plate 123, a connecting part 124, a generator 2 and a hub 3.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A direct drive wind power plant 100 according to an embodiment of the invention is described below with reference to fig. 1.

As shown in fig. 1, a direct-drive wind power generation apparatus 100 according to an embodiment of the present invention includes: tower 1, generator 2 and hub 3.

Specifically, the tower body 1 includes a tower 11 and a main frame 12 provided on top of the tower 11, one side of the main frame 12 (e.g., the front side of the main frame 12 shown in fig. 1) being formed as a motor mounting portion 121 recessed toward the central axis of the tower body 1; the generator 2 is fixed to the motor mounting portion 121, and a central axis of the generator 2 extends obliquely upward in a direction away from the main frame 12 (e.g., in a rear-to-front direction shown in fig. 1); the hub 3 is connected to the generator 2 and the hub 3 is located at a side of the generator 2 facing away from the tower 1 (e.g. the front side of the generator 2 as shown in fig. 1). The hub 3 may be used to mount and fix a blade of the direct-drive wind power generation device 100, and the blade may include a plurality of blades (for example, the number of the blades may be three) arranged at intervals in a circumferential direction of the hub 3.

According to the direct-drive wind power generation device 100 of the embodiment of the invention, the motor mounting part 121 of the main frame 12 is recessed towards the central axis of the tower body 1, so that when the generator 2 is mounted on the motor mounting part 121, the gravity center of the generator 2 can move towards the tower body 1, even the gravity center of the generator 2 can enter the diameter range of the tower body 1, and thus partial loads of the generator 2 and the hub 3 can directly act on the tower body 1, so that the forward overturning moment of the tower body 1 can be reduced, when the direct-drive wind power generation device 100 bears axial wind load in work, the total moment generated by the overturning moment towards the rear side of the tower 11, which is obtained by subtracting the forward overturning moment of the engine room, is backward, and is the same as or similar to the forward moment when the static load is carried out as much as possible, so that the weight of the tower 11 can be reduced.

Simultaneously, this embodiment extends through the central axis tilt up that makes generator 2, not only can further make generator 2 and wheel hub 3's focus move towards tower body 1 center, can also avoid the blade on the wheel hub 3 to hit tower body 1 at rotatory in-process for blade and tower body 1 do not interfere each other, and the structure sets up more rationally.

Therefore, according to the direct-drive wind power generation device 100 provided by the embodiment of the invention, partial loads of the generator 2 and the hub 3 can be directly acted on the tower body 1, and the forward overturning moment of the tower body 1 is reduced, so that the weight of the tower body 1 can be reduced, and the bearing capacity of the tower body 1 is improved.

In one embodiment of the invention, as shown in fig. 1, the angle a between the central axis of the generator 2 and the horizontal plane is not more than 30 °. Further, the angle a between the central axis of the generator 2 and the horizontal plane may be in the range of 10 ° to 20 °. Therefore, the gravity centers of the generator 2 and the hub 3 can be further moved towards the center of the tower body 1, and the forward overturning moment generated by the gravity of the generator 2 and the hub 3 is reduced, so that the weight of the tower body 1 is reduced, and the bearing capacity of the tower body 1 is improved.

For example, the angle a between the central axis of the generator 2 and the horizontal plane may be 5 °, 15 °, 25 °, or the like.

In some embodiments of the present invention, as shown in fig. 1, the motor mounting part 121 may be formed as a plate body extending obliquely upward toward a central axis of the tower body 1 (e.g., in a front-to-rear direction shown in fig. 1) in a direction from bottom to top, for example, the motor mounting part 121 may be formed as a rectangular plate body. The main chassis 12 may further include: the arc wallboard 122, the arc wallboard 122 extends along upper and lower direction, and the arc wallboard 122 can be the arc platelike that the central axis that encircles tower body 1 extends, and the both ends along width direction of motor installation department 121 (for example the both ends along tower body 1 circumferential direction of motor installation department 121) link to each other with the both ends along circumferential direction of arc wallboard 122 respectively. Therefore, the structure of the main frame 12 can be simplified, the processing and the forming are convenient, and the center of gravity of the generator 2 can move towards the center of the tower body 1.

In some examples, as shown in fig. 1, the angle b between the motor mounting portion 121 and the vertical plane is not greater than 30 °. Further, the angle b between the motor mounting part 121 and the central axis of the tower 1 may be in the range of 10 ° to 20 °. Therefore, on the premise that the gravity centers of the generator 2 and the hub 3 move towards the center of the tower body 1, the utilization rate of the direct-drive wind power generation device 100 to wind energy is ensured, and the power generation efficiency is ensured.

For example, the angle b between the motor mounting part 121 and the central axis of the tower 1 may be 5 °, 15 °, 25 °, or the like.

Further, as shown in fig. 1, the central axis of the generator 2 is perpendicular to the outer side surface of the motor mounting part 121, and at this time, the included angle a between the central axis of the generator 2 and the horizontal plane is equal to the included angle b between the motor mounting part 121 and the central axis of the tower body 1. Therefore, the generator 2 can be conveniently arranged, the gap between the stator and the rotor in the generator 2 is ensured, and the normal operation of the generator 2 is ensured.

In some embodiments, as shown in fig. 1, main frame 12 may further include: the transition plate 123 extends upwards in an inclined manner from bottom to top towards the center of the tower body 1, the transition plate 123 is connected to the lower end of the motor mounting part 121, and two ends of the transition plate 123 in the width direction are respectively connected to two ends of the arc-shaped wall plate 122 in the circumferential direction.

As shown in fig. 1, an included angle c between the transition plate 123 and the horizontal plane is smaller than an included angle d between the motor mounting portion 121 and the horizontal plane. That is, the transition plate 123 is inclined toward the center of the tower body 1 at a slope greater than that of the motor mounting part 121. The present embodiment can move the position of the motor mounting part 121 toward the center of the tower body 1 by providing the transition plate 123, and simultaneously, avoid the inclination of the motor mounting part 121 from being too large to affect the arrangement of the generator 2 and the hub 3.

Here, the motor mounting part 121, the arc-shaped wall plate 122 and the transition plate 123 may be integrally formed, and of course, the motor mounting part 121, the arc-shaped wall plate 122 and the transition plate 123 may also be welded and connected.

In some embodiments, as shown in FIG. 1, the tower 11 may be cylindrical, the lower end of the main frame 12 is formed with a cylindrical connection 124 connected to the tower 11, and the diameter of the connection 124 is substantially equal to the diameter of the top of the tower 11. Therefore, the tower 11 can be conveniently connected with the main frame 12, and the installation is convenient.

The connecting portion 124 may be connected to the motor mounting portion 121 and the transition plate 123 by welding.

In some embodiments, referring to fig. 1, the centre of gravity of the generator 2 may be located inside the tower 1 in a horizontal projection plane. Therefore, the forward overturning moment generated by the gravity of the generator 2 and the hub 3 can be reduced, so that the weight of the tower body 1 is reduced, and the bearing capacity of the tower body 1 is improved.

In some embodiments, the angle e between the central axis of the hub 3 and the horizontal plane is not more than 30 °. For example, the angle e between the central axis of the hub 3 and the horizontal plane may be 5 °, 10 °, 15 °, 20 °, 25 °, or the like. From this, can avoid the blade on the wheel hub 3 to hit tower body 1 at rotatory in-process for blade and tower body 1 noninterference, the structure sets up more rationally.

Here, it is understood that the included angle e between the central axis of the hub 3 and the horizontal plane and the included angle a between the central axis of the generator 2 and the horizontal plane may be equal or unequal.

A direct drive wind power plant 100 according to one embodiment of the present invention will be described below with reference to fig. 1.

Referring to fig. 1, specifically, as shown in fig. 1, the direct-drive wind power generation device 100 of the present embodiment includes a tower body 1, a generator 2, and a hub 3. Wherein the generator 2 is a permanent magnet generator 2.

In particular, the tower 1 comprises a tower 11 and a main frame 12, the main frame 12 supporting the generator 2, the generator 2 supporting the hub 3 of the wind wheel.

The main frame 12 is in a form of combining two parts, the upper part is in an irregular tower shape, the front end face of the tower-shaped structure is a motor installation part 121, the front end face is parallel to the generator 2 of the unit, and is contracted towards the center of the main frame 12 and forms a certain pitching angle (0-30 degrees), so that the gravity center of the hub 3 and the generator 2 can move towards the center of the tower body 1 and even enter the diameter range of the tower body 1, the center of the main frame 12 is further moved backwards by adjusting the pitching angle (0-30 degrees) of the hub 3 and the generator 2, and the tower 11 is prevented from being hit by blades arranged on the hub 3 in the rotating process.

The lower part of the main frame 12 is a connecting part 124 with a cylindrical structure so as to be connected with the tower 11 with a tower shape, and the upper part and the lower part of the main frame 12 can be connected by welding or riveting.

The main frame 12 can be used for arranging various devices of the direct-drive wind power generation device 100 inside the main frame 12 except for the supporting hub 3 and the generator 2, and the internal devices of the main frame 12 can be arranged in a stepped manner, wherein a lower space in the main frame 12 accommodates a main control cabinet, a current transformer, a hydraulic station and auxiliary equipment, a plurality of yaw devices are also arranged at the bottom in the main frame 12, and as the main frame 12 is higher in height, a ladder stand or other climbing facilities can be arranged in the main frame 12. The upper part of the cabin of the main frame 12 is also provided with a wind measuring device.

Wherein, the main frame 12 material can use the welding structure of Q345D, of course the main frame 12 can also use the casting structure of QT400-18 AL. When the main frame 12 is a welded structure, its outer dimension is approximately a cylinder of 6m in diameter and 10m in height. The welding structure has the main advantages of short production period and light weight, but the welding seam and the wall thickness need to be analyzed and calculated independently so as to ensure reasonable distribution of the wall thickness and avoid stress concentration of the welding seam.

When the main frame 12 is made of a cast structure, the main frame 12 should be divided into an upper cast part and a lower welded part, i.e., the lower connecting part 124 is cylindrical to facilitate the connection of the tower 11, and the upper part is a semi-closed frame structure, so that the main frame 12 with the cast structure can make the wall thickness distribution of the main frame 12 more reasonable and reduce stress concentration. Of course, the present invention is not limited thereto, and because the size and the weight of the main frame 12 are too large, the welding or the casting may cause difficulty in production due to too large external dimensions, so the main frame 12 may also adopt a segmented design, and then the segments are connected and assembled by using high-strength bolts.

According to the direct-drive wind power generation device 100 provided by the embodiment of the invention, the overturning moment of the center of the tower body 1 to the front side can be reduced, so that when the direct-drive wind power generation device 100 bears axial wind load in work, the total moment generated by subtracting the forward overturning moment of a cabin from the overturning moment of the rear side of the tower 11 generated by the wind load is backward, and is the same as or close to the forward moment under static load as much as possible, and the weight of the tower body 1 can be reduced.

In the present embodiment, the front end surface of the main frame 12 is moved backward, so that part of the load of the generator 2 directly acts on the tower 11, and the overturning moment generated by the gravity static load of the hub 3 and the generator 2 can be reduced by 15%, but the influence on the dynamic load is not changed. By adopting a finite element analysis method to calculate the strength and the rigidity of the tower body 1 of the embodiment, the complex welding structure can obtain high bearing capacity on the premise of minimum weight.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.