WO2013004125A1

WO2013004125A1 - Blade for wind generator set and wind generator set

Info

Publication number: WO2013004125A1
Application number: PCT/CN2012/077209
Authority: WO
Inventors: 叶杭冶; 陈棋
Original assignee: 浙江运达风电股份有限公司
Priority date: 2011-07-05
Filing date: 2012-06-20
Publication date: 2013-01-10
Also published as: CN102269117B; CN102269117A

Abstract

A blade for a wind generator set, comprising a blade root segment (6), a blade tip segment (5), and a bridge piece connecting the blade root segment (6) and the blade tip segment (5) and with a strength less than that of the two segments. When the blade of the wind generator set is subjected to gusts of strong wind, such as a typhoon, etc., if the load on the bridge piece exceeds what the piece can withstand, the bridge piece will break up so as to make the blade tip segment fall off. The blade tip segment falling off reduces the diameter of the whole blade of the wind generator set and reduces the swept area of the wind wheel, thus reducing the flexural load exerted on the tower frame and the base by the whole blade. In a very windy environment, such as in a typhoon, etc., the blade of the wind generator set protects the tower frame and the base, reducing loss to the whole of the wind generator set. Also provided in this invention is a wind generator set.

Description

Wind Turbine Blades and Wind Turbines This application claims priority to Chinese Patent Application No. 201110187786.9, entitled "Wind Wind Turbine Blades and Wind Turbines", filed on July 5, 2011, all contents of which are filed on July 5, 2011. This is incorporated herein by reference. Technical field

The present invention relates to the field of wind power equipment, and more particularly to a wind turbine blade, and to a wind turbine having the above blades.

Background technique

As a clean and renewable energy source, wind energy is receiving more and more attention from all countries in the world. China's wind energy resources have large reserves and wide distribution, and the development prospects are very broad. In recent years, China's wind power development has been very rapid. In particular, China's southeast coastal areas are rich in wind energy resources and close to the center of electricity load. Therefore, it is necessary to vigorously develop offshore wind power.

However, the above-mentioned coastal areas have frequent typhoons, which have put forward new requirements for the normal operation of wind turbines. In the process of wind turbine design, if improperly considered, when a strong wind such as a typhoon hits the wind farm, the wind turbine may be seriously damaged.

The main forms of damage to wind turbines such as typhoons include the following: blade breakage, blade cracking, tower breakage, and foundation overturning of the entire wind turbine. In the manufacturing process of the wind turbine, the three blades account for 15% of the total cost of the wind turbine. The single blade accounts for 5% of the total fan cost. Therefore, the damage caused by the blade damage in the above several failure modes It is smaller, and the breakage of the tower and the overturning of the foundation are the biggest damage to the entire wind turbine.

When the typhoon passes through the wind farm, the wind turbine's blades are high in position and the sweeping area is large. The bending moment load of the three blades on the tower and the foundation accounts for 70% or even more of the total load, of which the highest. The bending load of a single blade to the bottom of the tower can reach about 35% of the total load. Therefore, the blades in the wind turbine play a very important role in the breakage of the tower and the overturning of the foundation. Therefore, how to improve the blades of the wind turbine to reduce the bending moment load generated by the blades on the entire tower and the foundation when the blades are blown by strong wind such as typhoon, thereby reducing the loss of the wind turbine, is currently in the field. The problem that technicians need to solve. Summary of the invention

In view of the above, the present invention provides a wind turbine blade to reduce the bending moment load generated by the blade on the entire tower and the foundation when the blade is blown by a strong wind such as a typhoon, thereby reducing damage to the entire wind turbine. .

In order to achieve the above object, the present invention provides the following technical solutions:

A wind turbine blade includes a blade root segment, a blade tip segment, and a connector connecting the blade root segment and the blade tip segment with less strength than both.

Preferably, in the wind turbine blade, the connecting member comprises a flange disposed on the blade root segment and the tip segment and a bolt engaged with the flange.

Preferably, in the wind turbine blade, the length of the blade root segment is longer than the length of the blade tip segment.

Preferably, in the wind turbine blade, the length of the blade root section is 2/3 of the length of the entire wind turbine blade, and the length of the blade tip segment is 1/3 of the length of the wind turbine blade.

Preferably, in the wind turbine blade, a blade maintenance window is opened at a portion where the blade root segment is connected to the blade tip segment.

Preferably, in the wind turbine blade, the connection between the tip segment and the blade root segment is provided with a smooth surface for reinforcing the fiberglass cloth at the joint.

Based on the wind turbine blade provided above, the present invention also provides a wind turbine comprising the wind turbine blade of any of the above.

The wind turbine blade provided by the invention is divided into a blade root segment, a blade tip segment and a connecting piece, and the connecting member connects the blade root segment and the blade tip segment to form the entire blade, and the strength of the connecting member is lower than the blade root segment and the tip segment When the blade is blown by a strong wind such as a typhoon, when the load exceeds the bearing capacity of the connecting member, the connecting member is broken to cause the tip portion to fall off. The shedding of the tip section reduces the diameter of the entire wind turbine blade Small, the swept area of the wind turbine is reduced, which in turn reduces the bending load applied to the tower and foundation by the entire blade. The wind turbine blades described above allow the tower and foundation to be preserved in a strong wind such as a typhoon, reducing the loss of the entire wind turbine. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description It is merely some embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any creative work.

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

Figure 2 is a side view of Figure 1;

Figure 3 is a schematic view showing the structure of the wind turbine blade of Figure 1;

Figure 4 is a top plan view of Figure 3;

Figure 5 is a cross-sectional view taken along line A-A of Figure 3;

Figure 6 is a cross-sectional view taken along line B-B of Figure 5.

Above Figure 1 - Figure 6:

Hub assembly 1, engine room 2, tower 3, foundation 4, tip section 5, blade root section 6, blade maintenance window 7, bolt 8, flange 9, flange 10. detailed description

The invention provides a wind turbine blade which reduces the bending moment load generated by the blade on the entire tower and the foundation when the strong wind blows the blade such as a typhoon, thereby reducing the damage to the entire wind turbine.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art are not All other embodiments obtained under the premise of creative work are within the scope of the invention.

1 is a schematic structural view of a wind turbine set according to an embodiment of the present invention; FIG. 2 is a side view of FIG. 1; FIG. 3 is a schematic structural view of the wind turbine blade of FIG. It is a schematic view of the top view of Figure 3.

The wind turbine blade provided in the embodiment of the present invention comprises a blade root section 6, a tip section 5 and a connecting blade root section 6 and a tip section 5, and the strength is smaller than the joint of the blade root section 6 and the tip section 5.

The wind turbine blade provided by the invention is divided into a blade root segment 6, a tip segment 5 and a connecting member. When the entire wind turbine blade is blown by a strong wind such as a typhoon, the load exceeds the bearing capacity of the connecting member, due to the connecting member The strength is smaller than the blade root section 6 and the tip section 5, so that the joint breaks and the tip section 5 falls off. The shedding of the tip section 5 causes the diameter of the entire wind turbine blade to be reduced, and the sweeping area of the entire wind turbine blade is reduced, thereby reducing the bending load of the entire wind turbine blade against the tower 3 and the foundation 4. The above-mentioned blades allow the tower 3 and the base 4 to be preserved in a strong wind environment such as a typhoon, thereby reducing the loss of the entire wind turbine.

In the wind turbine blade provided in this embodiment, the connecting member functions to connect the blade root segment 6 and the tip segment 5, and the strength is lower than the strength of the above two, and the blade is broken under the action of strong wind. 6 is separated from the tip segment 5. As long as the connection can be satisfied, and the connecting members having a lower strength than the above-mentioned blade root segment 6 and tip segment 5 are within the protection scope of the patent, specifically, it may be a threaded connector, a connecting pin or the like. This embodiment provides a connector, please refer to 5-6, the connector includes a flange 10 disposed on the blade root section 6, a flange 9 on the tip segment 5, and a connecting flange 9 and a flange 10. Bolt 8.

In the wind turbine blade provided in the above embodiment, a moment load sensor may be disposed at the junction of the tip section 5 and the blade section 6 for collecting the bend between the tip section 5 and the blade root section 6. The moment signal transmits the bending moment signal to the controller, and the controller receives the signal transmitted by the bending moment load sensor and then controls the bolt to burst, thereby realizing the failure of the bolt.

Specifically, in the wind turbine blade, the length of the blade root segment 6 is longer than the length of the blade tip segment 5. Preferably, the length of the blade root segment 6 is 2/3 of the length of the entire wind turbine blade, and the blade tip segment 5 The length is 1/3 of the length of the wind turbine blade. Of course, the ratio of the length between the blade root segment 6 and the tip segment 5 can be appropriately adjusted according to the actual working environment, and is not limited to the above enumerated cases. Take the 1.5MW typhoon wind turbine as an example. The diameter of the wind wheel is 77m and the height of the tower is 65m. The highest safety level of IEC61400-1 (70m/s for 3s in 50 years), at V _e 50 = 70m/s, before and after the wind turbine blade breaks, compare the bending moment load at the bottom of tower 3. When the blade is not broken, the bending moment at the bottom of the tower is Mxy = 46650.9KNM. When the tip section breaks, the bending moment Mxy of the tower bottom is reduced to 40762.9KNM, and the decrease is 14.4%. From the above comparison, it can be concluded that the blade tip segment obviously reduces the application of the wind turbine blade to the tower 3. Moment load.

In order to more conveniently repair the wind turbine blade, a blade maintenance window 7 is provided at a portion where the blade root section 6 is connected to the blade tip section 5.

In the wind turbine blade provided in the above embodiment, in order to ensure the smoothness of the surface of the entire wind turbine blade, a fiberglass cloth for reinforcing the joint is placed at the junction of the blade tip section 5 and the blade root section 6. Preferably, the surface of the fiberglass cloth is a smooth surface for the final spraying of the entire wind turbine blade.

Based on the wind turbine blade provided in the above embodiment, the present invention also provides a wind turbine. Referring to FIG. 1 or 2, the wind turbine includes a foundation 4, a tower 3, a hub assembly 1, a machine grab 2, and The wind turbine blade, wherein the wind turbine blade is the wind turbine blade provided in the above embodiment.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but the broadest scopes

Claims

Rights request

A wind turbine blade, characterized in that it comprises a blade root segment (6), a tip segment (5), and a connection between the blade root segment (6) and the tip segment (5), and the strength is less than Connector.

2. A wind turbine blade according to claim 1, wherein said connecting member comprises a flange disposed on said blade root section (6) and tip segment (5) and said flange Fit the bolts ( 8 ).

3. Wind turbine blade according to claim 2, characterized in that the length of the blade root section (6) is longer than the length of the blade tip section (5).

4. Wind turbine blade according to claim 3, characterized in that the length of the blade root section (6) is 2/3 of the length of the entire wind turbine blade, the length of the blade tip segment (5) It is 1/3 of the length of the wind turbine blade.

The wind turbine blade according to any one of claims 1 to 4, characterized in that the blade root section (6) is connected to the blade tip section (5) to provide blade maintenance Window (7).

The wind turbine blade according to claim 5, characterized in that the junction of the tip section (5) and the blade root section (6) is provided with a smooth surface for reinforcing the joint. Fiberglass cloth.

A wind turbine, characterized in that it has the wind turbine blade according to any one of claims 1 to 6.