Blades and wind turbines

Abstract

The present invention provides a blade and a wind turbine generator set. The blade includes: a pressure surface shell and a suction surface shell; a web, which is supported between the pressure surface shell and the suction surface shell along the span direction of the blade, and divides the inner cavity of the blade into a front cavity located at the leading edge side and a rear cavity located at the trailing edge side; at least one front cavity airbag and at least one rear cavity airbag, the at least one front cavity airbag is arranged in the front cavity and fits the inner surface of the front cavity, and the at least one rear cavity airbag is arranged in the rear cavity and fits the inner surface of the rear cavity; an automatic inflation device, which automatically inflates the at least one front cavity airbag and the at least one rear cavity airbag. According to the present invention, the structural damping of the blade in low-order modes and high-order modes can be improved at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and more specifically, to a blade and a wind power generator set. Background Art

[0002] The structural damping ratio of the blades of a wind turbine is usually around 0.1%-0.7%. Under the action of wind load, the blade-impeller system is prone to stall, bending-torsion coupling flutter and other phenomena due to the lack of its own structural damping.

[0003] In the prior art, blade vibration can be reduced by dynamic vibration absorbers, oil vibration reduction devices and piezoelectric devices. However, dynamic vibration absorbers can only reduce vibration at a certain frequency of the blade and cannot improve the structural damping of the blade as a whole. Due to its complex structure, the oil vibration reduction device is not suitable for installation in a narrow blade cavity, and it is easy to cause faults such as oil leakage and slider jamming, which reduces the reliability of the system. Although the piezoelectric material in the piezoelectric device can generate strain inside the structure through electric current and increase the blade damping, the system consumes electricity and the piezoelectric device has a short life. In addition, an additional controller is required, resulting in high costs. Summary of the invention

[0004] The object of the present invention is to provide a blade and a wind turbine generator set capable of simultaneously improving structural damping in low-order modes and high-order modes.

[0005] Another object of the present invention is to provide a blade and a wind turbine generator set that can better maintain the airbag inflated state.

[0006] Another object of the present invention is to provide a blade and a wind turbine generator set that can effectively reduce blade impact and fatigue loads, blade stall flutter or bending-torsion coupled flutter.

[0007] According to one aspect of the present invention, a blade is provided, the blade comprising: a pressure surface shell and a suction surface shell; a web, supported between the pressure surface shell and the suction surface shell along the span direction of the blade, dividing the inner cavity of the blade into a front cavity located at the leading edge side and a rear cavity located at the trailing edge side; at least one front cavity airbag and at least one rear cavity airbag, the at least one front cavity airbag is arranged in the front cavity and fits with the inner surface of the front cavity, the at least one rear cavity airbag is arranged in the rear cavity and fits with the inner surface of the rear cavity; an automatic inflation device, automatically inflating the at least one front cavity airbag and the at least one rear cavity airbag. By arranging the front cavity airbag and the rear cavity airbag, the structural damping of the blade in low-order modes and high-order modes can be improved at the same time, and the impact and fatigue load of the blade as well as the stall flutter or bending-torsion coupling flutter of the blade can be reduced. By setting up an automatic inflation device, the front cavity airbag and the rear cavity airbag can be automatically inflated. On the one hand, the cost of manual inflation can be reduced. On the other hand, the air pressure of the front cavity airbag and the rear cavity airbag can be better maintained so that the front cavity airbag and the rear cavity airbag fit tightly with the inner surfaces of the front cavity and the rear cavity, providing structural damping for the blade itself.

[0008] Optionally, the automatic inflation device includes an inflation tube and an inflation pump connected to the inflation tube, each of the front chamber airbag and the rear chamber airbag is connected to the inflation tube, and the inflation pump inflates the front chamber airbag and the rear chamber airbag simultaneously through the inflation tube, thereby reducing inflation time and inflation cost.

[0009] Optionally, the automatic inflation device also includes: an air pressure sensor, which is arranged at the entrance of the inflation tube to sense the pressure values ​​in the front chamber airbag and the rear chamber airbag; and a controller, which turns on or off the inflation pump according to the pressure value sensed by the air pressure sensor.

[0010] Optionally, the controller is configured to: when the pressure sensed by the air pressure sensor is less than or equal to a first threshold, turn on the air pump to inflate the front chamber airbag and the rear chamber airbag; when the pressure sensed by the air pressure sensor is greater than or equal to a second threshold, turn off the air pump, wherein the second threshold is greater than the first threshold.

[0011] Optionally, the automatic inflation device further includes: a timer for timing the inflation time of the front airbag and the rear airbag; and a fault alarm for sounding an alarm when the inflation time of the front airbag and the rear airbag exceeds a threshold. According to an embodiment of the present invention, by providing a timer and an alarm, it is helpful to detect the fault of the front airbag and the rear airbag, avoid the situation where the airbag is not fully inflated, and timely detect the damage of the airbag and replace it.

[0012] Optionally, the blade includes two webs separated from each other along the chord direction of the blade, the inflation tube extends between the two webs, and the front cavity airbag and the rear cavity airbag are both provided with an inflation nozzle, which passes through the corresponding web of the two webs to be connected to the inflation tube.

[0013] Optionally, the blade includes a plurality of front cavity airbags and a plurality of rear cavity airbags, the plurality of front cavity airbags are arranged along the span direction of the blade and the adjacent front cavity airbags fit each other, and the plurality of rear cavity airbags are arranged along the span direction of the blade and the adjacent rear cavity airbags fit each other. Since the plurality of front cavity airbags and the plurality of rear cavity airbags can be arranged along the span direction of the blade according to the change of the cavity shape of the front cavity and the rear cavity, each front cavity airbag and the rear cavity airbag can be better fit with the inner surface of the front cavity or the rear cavity, further increasing the structural damping of the blade itself. In addition, by making the front cavity airbags adjacent to each other in the span direction fit each other, and the rear cavity airbags adjacent to each other in the span direction of the blade fit each other, when the blade is deformed, the front cavity airbags that fit each other and the rear cavity airbags that are adjacent to each other can rub against each other, release vibration energy in the form of frictional heat, thereby improving the structural damping of the blade itself.

[0014] Optionally, the blade further includes a plurality of front cavity baffles and a plurality of rear cavity baffles. The plurality of front cavity baffles are supported between the pressure surface shell and the suction surface shell in the front cavity, and the plurality of front cavity baffles are separated from each other along the span direction of the blade to divide the front cavity into a plurality of front cavity subspaces, and the plurality of front cavity airbags are respectively arranged in the plurality of front cavity subspaces. The plurality of rear cavity baffles are supported between the pressure surface shell and the suction surface shell in the rear cavity, and the plurality of rear cavity baffles are separated from each other along the span direction of the blade to divide the rear cavity into a plurality of rear cavity subspaces, and the plurality of rear cavity airbags are respectively arranged in the plurality of rear cavity subspaces. According to the present invention, by arranging the front cavity baffles and the rear cavity baffles, the front cavity airbags and the rear cavity airbags can be prevented from moving in the span direction of the blade, so that the front cavity airbags and the rear cavity airbags can better play the role of structural damping.

[0015] Optionally, the plurality of front cavity baffles each have a front cavity baffle hole penetrating the plurality of front cavity baffles, and the adjacent front cavity airbags are fitted together through the front cavity baffle holes. The plurality of rear cavity baffles each have a rear cavity baffle hole penetrating the plurality of rear cavity baffles, and the adjacent rear cavity airbags are fitted together through the rear cavity baffle holes.

[0016] Optionally, the front cavity airbag and the rear cavity airbag are distributed in the range of one third to four fifths of the distance from the root of the blade in the span direction of the blade. A protrusion is arranged on the surface of each of the front cavity airbag and the rear cavity airbag. By arranging the protrusion on the surface of the front cavity airbag and the rear cavity airbag, the friction between the front cavity airbag and the rear cavity airbag and the front cavity or the rear cavity can be increased, the friction between the front cavity airbag and the rear cavity airbag and the web can be increased, and the friction between adjacent front cavity airbags and adjacent rear cavity airbags that are in contact with each other can be increased, so that the structural damping of the blade can be further improved. As an example, the protrusion can be distributed on the entire surface or part of the surface of the front cavity airbag and the rear cavity airbag. Among them, the height of the protrusion is a sinusoidal distribution, and the airbags that rub against each other can effectively improve the damping effect due to the mutual insertion friction between the protrusions of different heights.

[0017] According to another aspect of the present invention, a wind turbine generator set is provided, wherein the wind turbine generator set comprises the blade as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a chord-wise cross-sectional view schematically showing a blade according to an embodiment of the present invention;

[0020] Figure 2 is an exploded schematic diagram schematically showing a section of a blade according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram schematically showing a spanwise direction of a blade according to an embodiment of the present invention;

[0022] Figure 4 is a flow chart schematically illustrating automatic inflation of an airbag according to an embodiment of the present invention.

[0023] Explanation of the accompanying drawings: 11 is the pressure surface shell, 12 is the suction surface shell, 13 is the belly plate, 14 is the front cavity, 15 is the rear cavity, 16 is the front cavity baffle, 17 is the rear cavity baffle, 16a is the front cavity baffle hole, 17a is the rear cavity baffle hole, 21 is the front cavity airbag, 22 is the rear cavity airbag, 21a and 22a are the inflation nozzles, 30 is the inflation tube, and 40 is the inflation pump. DETAILED DESCRIPTION

[0024] Hereinafter, a blade and a wind turbine generator set according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0025] Figure 1 is a chord-wise cross-sectional view schematically showing a blade according to an embodiment of the present invention, Figure 2is an exploded schematic diagram schematically showing a section of a blade according to an embodiment of the present invention, Figure 3 is a schematic diagram schematically showing a spanwise view of a blade according to an embodiment of the present invention, Figure 4 is a flow chart schematically illustrating automatic inflation of an airbag according to an embodiment of the present invention.

[0026] like Figures 1 to 3 As shown, the blade according to an embodiment of the present invention includes: a pressure surface shell 11 and a suction surface shell 12; a web 13, which is supported between the pressure surface shell 11 and the suction surface shell 12 along the span direction of the blade, and divides the inner cavity of the blade into a front cavity 14 located on the leading edge side and a rear cavity 15 located on the trailing edge side; at least one front cavity airbag 21 and at least one rear cavity airbag 22, at least one front cavity airbag 21 is arranged in the front cavity 14 and fits with the inner surface of the front cavity 14, and at least one rear cavity airbag 22 is arranged in the rear cavity 15 and fits with the inner surface of the rear cavity 15; an automatic inflation device, which automatically inflates at least one front cavity airbag 21 and at least one rear cavity airbag 22.

[0027] like Figure 1 and Figure 2 As shown, the blade according to the embodiment of the present invention may include a pressure surface shell 11 and a suction surface shell 12 coupled to each other. The web 13 is supported between the pressure surface shell 11 and the suction surface shell 12 along the span direction of the blade. Figure 1 and Figure 2 1 shows two webs 13 separated from each other along the chord direction of the blade, but the blade according to the embodiment of the present invention may also have a single web structure, that is, the blade may include only one web (such as Figure 3 According to the embodiment of the present invention, the web 13 divides the inner cavity of the blade into a front cavity 14 located at the leading edge side and a rear cavity 15 located at the trailing edge side.

[0028] According to an embodiment of the present invention, the blade may include at least one front cavity airbag 21 and at least one rear cavity airbag 22, wherein the at least one front cavity airbag 21 is disposed in the front cavity 14 and fits with the inner surface of the front cavity 14, and the at least one rear cavity airbag 22 is disposed in the rear cavity 15 and fits with the inner surface of the rear cavity 15. The inner surface of the front cavity 14 or the rear cavity 15 may include the inner surface of the blade and / or the surface of the web.

[0029] According to the embodiment of the present invention, by respectively arranging at least one front cavity airbag 21 and at least one rear cavity airbag 22 in the front cavity 14 and the rear cavity 15, when the blade is deformed, relative shear motion occurs between the front cavity airbag 21 and the rear cavity airbag 22 and the blade surface, and under the action of the internal air pressure of the front cavity airbag 21 and the rear cavity airbag 22, the friction between the front cavity airbag 21 and the rear cavity airbag 22 and the blade surface is relatively large, which can increase the structural damping of the blade itself. Therefore, the blade according to the embodiment of the present invention can simultaneously improve the structural damping of the blade in low-order modes and high-order modes, and can reduce the blade impact and fatigue loads as well as the stall flutter or bending-torsion coupling flutter of the blade.

[0030] According to an embodiment of the present invention, the blades may further include an automatic inflation device, which can automatically inflate at least one front cavity airbag 21 and at least one rear cavity airbag 22 to maintain the air pressure of the front cavity airbag 21 and the rear cavity airbag 22. On the one hand, it can reduce the cost of manual inflation, and on the other hand, it can better maintain the air pressure of the front cavity airbag 21 and the rear cavity airbag 22 so that the front cavity airbag 21 and the rear cavity airbag 22 are tightly fitted with the inner surfaces of the front cavity 14 and the rear cavity 15.

[0031] Hereinafter, the front chamber airbag 21 and the rear chamber airbag 22 according to the embodiment of the present invention will be described first.

[0032] According to an embodiment of the present invention, the main material of the front airbag 21 and the rear airbag 22 is a flexible material, which can enclose a cavity and fill the cavity with gas. As an example, the main material of the front airbag 21 and the rear airbag 22 can be at least one of rubber, plastic and polyvinyl chloride film. As an example, the gas in the front airbag 21 and the rear airbag 22 is air or nitrogen.

[0033] According to an embodiment of the present invention, Figure 3 As shown, the blade may include a plurality of front cavity airbags 21 and a plurality of rear cavity airbags 22, and the plurality of front cavity airbags 21 and the plurality of rear cavity airbags 22 are arranged along the span direction of the blade.

[0034] like Figure 3 As shown, the cavity shapes of the front cavity 14 and the rear cavity 15 will change along the span direction of the blade. Therefore, multiple front cavity airbags 21 and multiple rear cavity airbags 22 can be arranged along the span direction of the blade according to the changes in the cavity shapes of the front cavity 14 and the rear cavity 15, so that each front cavity airbag 21 and the rear cavity airbag 22 can better fit with the inner surface of the front cavity 14 or the rear cavity 15, thereby further increasing the structural damping of the blade itself.

[0035] In addition, according to the embodiment of the present invention, the front cavity airbags 21 adjacent to each other in the span direction of the blade can be fitted together, and the rear cavity airbags 22 adjacent to each other in the span direction of the blade can be fitted together. According to the embodiment of the present invention, by making the front cavity airbags 21 adjacent to each other in the span direction fit together, and the rear cavity airbags 22 adjacent to each other in the span direction of the blade fit together, when the blade is deformed, the front cavity airbags 21 that fit together and the rear cavity airbags 22 that are adjacent to each other can rub against each other, release vibration energy in the form of friction heat, and thus improve the structural damping of the blade itself.

[0036] According to the embodiment of the present invention, in order to prevent the front cavity airbag 21 and the rear cavity airbag 22 from moving in the span direction, the blade may further include a plurality of front cavity baffles 16 and a plurality of rear cavity baffles 17 .

[0037] A plurality of front cavity baffles 16 are supported between the pressure surface shell 11 and the suction surface shell 12 in the front cavity 14. The plurality of front cavity baffles 16 are separated from each other along the span direction of the blade to divide the front cavity 14 into a plurality of front cavity subspaces 14a. A plurality of front cavity airbags 21 can be respectively arranged in the plurality of front cavity subspaces 14a.

[0038] A plurality of rear cavity baffles 17 are supported between the pressure surface shell 11 and the suction surface shell 12 in the rear cavity 15. The plurality of rear cavity baffles 17 are separated from each other along the span direction of the blade to divide the rear cavity 15 into a plurality of rear cavity subspaces 15a. A plurality of rear cavity airbags 22 can be respectively arranged in the plurality of rear cavity subspaces 15a.

[0039] As an example, the front cavity baffle 16 may completely separate the front cavity 14 , and the rear cavity baffle 17 may completely separate the rear cavity 15 .

[0040] According to the embodiment of the present invention, the plurality of front cavity baffles 16 each have a front cavity baffle hole 16a penetrating the plurality of front cavity baffles 16, so that the adjacent front cavity airbags 21 can pass through the front cavity baffle hole 16a to fit each other. The plurality of rear cavity baffles 17 each have a rear cavity baffle hole 17a penetrating the plurality of rear cavity baffles 17, so that the adjacent rear cavity airbags 22 can pass through the rear cavity baffle hole 17a to fit each other. The shape and size of the front cavity baffle hole 16a and the rear cavity baffle hole 17a are not specifically limited, as long as it is ensured that the adjacent front cavity airbags 21 can pass through the front cavity baffle hole 16a to fit each other, and the adjacent rear cavity airbags 22 can pass through the rear cavity baffle hole 17a to fit each other.

[0041] In addition, according to an embodiment of the present invention, the front cavity baffle 16 and the rear cavity baffle 17 can be replaced by hooking the front cavity airbag 21 and the rear cavity airbag 22 to the front cavity 14 or the rear cavity 15 to prevent the front cavity airbag 21 and the rear cavity airbag 22 from moving in the extension direction.

[0042] According to the embodiment of the present invention, the front cavity airbag 21 and the rear cavity airbag 22 are distributed in the range of one third to four fifths of the distance from the blade root in the span direction of the blade. This is because the deformation of the blade near the blade root is small, so it is not necessary to set up an airbag, while near the blade tip, the inner cavity of the blade is very small, so there is not enough space to set up an airbag.

[0043] According to an embodiment of the present invention, a protrusion is provided on the surface of each of the front cavity airbag 21 and the rear cavity airbag 22. When the protrusion is provided on the surface of the front cavity airbag 21 and the rear cavity airbag 22, the friction between the front cavity airbag 21 and the rear cavity airbag 22 and the front cavity 14 or the rear cavity 15 can be increased, the friction between the front cavity airbag 21 and the rear cavity airbag 22 and the web 13 can be increased, and the friction between the adjacent front cavity airbags 21 and the adjacent rear cavity airbags 22 that are attached to each other can be increased, so that the structural damping of the blade can be further improved. As an example, the protrusions can be distributed on the entire surface or part of the surface of the front cavity airbag 21 and the rear cavity airbag 22.

[0044] According to an embodiment of the present invention, a "protrusion" may refer to any structure that increases the surface roughness of the front chamber airbag 21 and the rear chamber airbag 22 (greater than the surface roughness of the front chamber airbag 21 and the rear chamber airbag 22 when no protrusion is provided). As an example, the protrusion may be a circular, triangular or other shaped protrusion that bulges from the surface of the corresponding front chamber airbag 21 and the rear chamber airbag 22. However, the present invention is not limited thereto. For example, protrusions may also be provided on the surfaces of the front chamber airbag 21 and the rear chamber airbag 22 by applying other materials (e.g., any material having a surface roughness greater than the main material of the front chamber airbag 21 and the rear chamber airbag 22) to the surfaces of the front chamber airbag 21 and the rear chamber airbag 22.

[0045] According to an embodiment of the present invention, the chordal cross-section of the front airbag 21 and the rear airbag 22 can be at least one of a quadrilateral (for example, a trapezoid, a square, a rectangle, a rhombus with an angle not equal to 90°), a triangle, a circle, a semicircle, an ellipse, and a polygon with more than four sides.

[0046] In addition, according to an embodiment of the present invention, the shapes of each front cavity airbag 21 and each rear cavity airbag 22 can be specifically designed according to the cavity shape of each position of the front cavity 14 or the rear cavity 15 in the span direction of the blade, so as to maximize the fitting area between the front cavity airbag 21 and the rear cavity airbag 22 and the front cavity 14 or the rear cavity 15. That is, the shapes of the plurality of front cavity airbags 21 can be the same or different from each other, and the shapes of the plurality of rear cavity airbags 22 can be the same or different from each other. According to an embodiment of the present invention, when the shapes of the plurality of front cavity airbags 21 are different from each other, the shapes of each front cavity airbag 21 can be designed according to the cavity shape of each position of the front cavity 14 in the span direction of the blade, so as to maximize the fitting area between the front cavity airbag 21 and the front cavity 14. When the shapes of the plurality of rear cavity airbags 22 are different from each other, the shapes of each rear cavity airbag 22 can be designed according to the cavity shape of each position of the rear cavity 15 in the span direction of the blade, so as to maximize the fitting area between the rear cavity airbag 22 and the rear cavity 15.

[0047] Hereinafter, an automatic inflation device according to an embodiment of the present invention will be described.

[0048] like Figure 2 As shown, the automatic inflation device according to the embodiment of the present invention may include an inflation tube 30 and an inflation pump 40 connected to the inflation tube 30. Each of the front chamber airbag 21 and the rear chamber airbag 22 is connected to the inflation tube 30, and the inflation pump 40 inflates the front chamber airbag 21 and the rear chamber airbag 22 simultaneously through the inflation tube 30. Therefore, the inflation time and inflation cost can be reduced.

[0049] As an example, Figure 2 As shown, the inflation tube 30 may be disposed between the front chamber airbag 21 and the rear chamber airbag 22. When the blade includes two webs 13, the inflation tube 30 may extend between the two webs 13. In addition, when the blade includes only one web 13, the inflation tube 30 may be disposed on either side of the web 13. As an example, an adhesive block may be disposed on the side wall of the web 13, and then the inflation tube 30 may be fixed to the adhesive block with a binding tape.

[0050] According to an embodiment of the present invention, Figure 1 As shown, the front airbag 21 is provided with an inflation nozzle 21a at a position close to the belly plate 13, and the rear airbag 22 is provided with an inflation nozzle 22a at a position close to the belly plate 13. Figure 2 As shown, the inflation nozzles 21 a and 22 a can respectively pass through corresponding webs of the two webs 13 to be connected to the inflation tube 30 .

[0051] As an example, the air pump 40 can be installed and fixed in the hub of the impeller, and can be powered through the port of the pitch cabinet. As an example, for three blades of the wind turbine generator set, three independent air pumps can be respectively provided. As an example, the air pump 40 can be arranged inside the hub, and the air pump can be fixed to the bracket inside the hub by means of fixing members such as bolts.

[0052] The automatic inflation device according to the embodiment of the present invention may further include an air pressure sensor (not shown) and a controller (not shown). The air pressure sensor may be disposed at the inlet of the inflation tube 30 to sense the pressure in the front airbag 21 and the rear airbag 22. Since the inflation tube 30 is in communication with the front airbag 21 and the rear airbag 22, the pressure at the inlet of the inflation tube 30 is the pressure in the front airbag 21 and the rear airbag 22.

[0053] The controller may turn on or off the air pump 40 according to the pressure sensed by the air pressure sensor. According to an embodiment of the present invention, the controller may be configured to: when the pressure sensed by the air pressure sensor is less than or equal to a first threshold, open the air inlet valve of the air pump 40 to inflate the front airbag 21 and the rear airbag 22, and when the pressure sensed by the air pressure sensor is greater than or equal to a second threshold, close the air inlet valve of the air pump 40. The second threshold is greater than the first threshold.

[0054] As an example, the first threshold may be less than the specified pressure of the front airbag 21 and the rear airbag 22, for example, it may be 80%-95% of the specified pressure of the front airbag 21 and the rear airbag 22. However, the present invention is not limited thereto, and those skilled in the art may freely design the first threshold according to actual needs.

[0055] As an example, the second threshold value may be greater than or equal to the specified pressure of the front airbag 21 and the rear airbag 22, for example, it may be 100%-110% of the specified pressure of the front airbag 21 and the rear airbag 22. However, the present invention is not limited thereto, and those skilled in the art may freely design the second threshold value according to actual needs.

[0056] The automatic inflation device according to the embodiment of the present invention may further include a timer and a fault alarm. The timer is configured to time each inflation time of the front airbag 21 and the rear airbag 22. The fault alarm is configured to alarm when the inflation time of the front airbag 21 and the rear airbag 22 exceeds a threshold.

[0057] That is to say, if the air pump 40 still cannot reach the second threshold after a certain period of inflation, it means that there is leakage in the front airbag 21 and / or the rear airbag 22. At this time, the fault alarm sounds, the air inlet valve of the air pump 40 is closed, and the front airbag 21 and the rear airbag 22 are inspected. As an example, the threshold of the above timer can be determined according to the normal inflation time of the front airbag 21 and the rear airbag 22. According to an embodiment of the present invention, by setting a timer and an alarm, it is helpful to find the fault of the front airbag 21 and the rear airbag 22, and avoid the situation where the airbag is always inflated but not fully inflated.

[0058] As an example of overhaul, the overhaul can be performed when the wind turbine generator set is shut down. Specifically, the front airbag 21 and the rear airbag 22 can be completely replaced, and then the replaced front airbag 21 and the rear airbag 22 are inflated and checked to determine the leaking airbag.

[0059] Figure 4 FIG. 2 shows a schematic flow chart of inflation using an automatic inflation device. Figure 4 As shown, first, the controller determines whether the air inlet pressure sensed by the pressure sensor is less than or equal to a first threshold. When the air inlet pressure is less than or equal to the first threshold, the air inlet valve of the air pump 40 is opened and timing is started.

[0060] Then, the controller determines whether the air inlet pressure sensed by the pressure sensor is greater than or equal to the second threshold value. When the air inlet pressure is greater than or equal to the second threshold value, the air inlet valve of the inflation pump 40 is closed. When the air inlet pressure is less than the second threshold value, the controller determines whether the timing of the timer has reached the threshold value. If the timing reaches the threshold value, it means that there is leakage in the front chamber airbag 21 and / or the rear chamber airbag 22. At this time, the fault alarm sounds, the air inlet valve of the inflation pump 40 is closed, and the front chamber airbag 21 and the rear chamber airbag 22 are inspected. If the timing does not reach the threshold value, the inflation continues and the controller repeats the operation of determining whether the air inlet pressure sensed by the pressure sensor is greater than or equal to the second threshold value.

[0061] According to an embodiment of the present invention, the front chamber airbag 21 and the rear chamber airbag 22 are automatically inflated at the same time by an automatic inflation device. On the one hand, the cost of manual inflation can be reduced, and on the other hand, the air pressure of the front chamber airbag 21 and the rear chamber airbag 22 can be better maintained so that the front chamber airbag 21 and the rear chamber airbag 22 fit tightly with the inner surfaces of the front chamber 14 and the rear chamber 15.

[0062] According to an embodiment of the present invention, a wind turbine generator set including the blade as described above may also be provided.

[0063] According to the present invention, by arranging the front cavity airbag and the rear cavity airbag, the structural damping of the blade in the low-order mode and the high-order mode can be improved at the same time, and the blade impact and fatigue load as well as the blade stall flutter or bending-torsion coupled flutter can be reduced.

[0064] According to the present invention, by providing an automatic inflation device, the front cavity airbag and the rear cavity airbag can be automatically inflated, which can reduce the cost of manual inflation on the one hand, and better maintain the air pressure of the front cavity airbag and the rear cavity airbag on the other hand, so that the front cavity airbag and the rear cavity airbag fit tightly with the inner surfaces of the front cavity and the rear cavity, providing structural damping for the blade itself.

[0065] According to the present invention, a plurality of front cavity airbags that fit together along the span direction of the blade and a plurality of rear cavity airbags that fit together can be provided. Therefore, the shape of the airbag can be designed according to the shape change of the inner cavity of the blade, so that the airbag can better fit the inner surface of the front cavity or the rear cavity, thereby further increasing the structural damping.

[0066] While exemplary embodiments of the present invention have been described in detail with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the claims.

Claims

1. A blade, characterized in that: The blade comprises: A pressure surface shell (11) and a suction surface shell (12); A web (13) is supported between the pressure surface shell (11) and the suction surface shell (12) along the span direction of the blade, and divides the inner cavity of the blade into a front cavity (14) located at the leading edge side and a rear cavity (15) located at the trailing edge side; at least one front cavity airbag (21) and at least one rear cavity airbag (22), wherein the at least one front cavity airbag (21) is arranged in the front cavity (14) and is in contact with the inner surface of the front cavity (14), and the at least one rear cavity airbag (22) is arranged in the rear cavity (15) and is in contact with the inner surface of the rear cavity (15); An automatic inflation device is provided for automatically inflating the at least one front chamber airbag (21) and the at least one rear chamber airbag (22).

2. The blade according to claim 1, characterized in that The automatic inflation device comprises an inflation tube (30) and an inflation pump (40) connected to the inflation tube (30); each of the front chamber airbag (21) and the rear chamber airbag (22) is connected to the inflation tube (30); and the inflation pump (40) inflates the front chamber airbag (21) and the rear chamber airbag (22) simultaneously through the inflation tube (30).

3. The blade according to claim 2, characterized in that The automatic inflation device also includes: An air pressure sensor, the air pressure sensor being arranged at the entrance of the inflation tube (30) to sense the pressure in the front chamber airbag (21) and the rear chamber airbag (22); The controller turns on or off the air pump (40) according to the pressure sensed by the air pressure sensor.

4. The blade according to claim 3, characterized in that The controller is configured to: when the pressure sensed by the air pressure sensor is less than or equal to a first threshold, turn on the inflation pump (40) to inflate the front chamber airbag (21) and the rear chamber airbag (22); when the pressure sensed by the air pressure sensor is greater than or equal to a second threshold, turn off the inflation pump (40), wherein the second threshold is greater than the first threshold.

5. The blade according to claim 4, characterized in that The automatic inflation device also includes: A timer for timing the inflation time of the front chamber airbag (21) and the rear chamber airbag (22); A fault alarm is provided, which sounds an alarm when the inflation time of the front airbag (21) and the rear airbag (22) exceeds a threshold value.

6. The blade according to claim 2, characterized in that The blade comprises two webs (13) separated from each other along the chord direction of the blade, and the air filling tube (30) extends between the two webs (13). Each of the front chamber airbag (21) and the rear chamber airbag (22) is provided with an inflation nozzle (21a, 22a), and the inflation nozzle (21a, 22a) passes through a corresponding web plate of the two web plates (13) to be connected to the inflation tube (30).

7. The blade according to any one of claims 1 to 6, characterized in that The blade comprises a plurality of front cavity airbags (21) and a plurality of rear cavity airbags (22), wherein the plurality of front cavity airbags (21) are arranged along the span direction of the blade and adjacent front cavity airbags (21) are fitted together, and the plurality of rear cavity airbags (22) are arranged along the span direction of the blade and adjacent rear cavity airbags (22) are fitted together.

8. The blade according to claim 7, characterized in that The blade further comprises a plurality of front cavity baffles (16) and a plurality of rear cavity baffles (17). The plurality of front cavity baffles (16) are supported between the pressure surface shell (11) and the suction surface shell (12) in the front cavity (14); the plurality of front cavity baffles (16) are separated from each other along the span direction of the blade to divide the front cavity (14) into a plurality of front cavity subspaces (14a); and the plurality of front cavity airbags (21) are respectively arranged in the plurality of front cavity subspaces (14a). The plurality of rear cavity baffles (17) are supported between the pressure surface shell (11) and the suction surface shell (12) in the rear cavity (15); the plurality of rear cavity baffles (17) are separated from each other along the span direction of the blade to divide the rear cavity (15) into a plurality of rear cavity subspaces (15a); and the plurality of rear cavity airbags (22) are respectively arranged in the plurality of rear cavity subspaces (15a).

9. The blade according to claim 8, characterized in that The plurality of front cavity baffles (16) each have a front cavity baffle hole (16a) penetrating the plurality of front cavity baffles (16), and the adjacent front cavity airbags (21) pass through the front cavity baffle holes (16a) to fit each other. The plurality of rear cavity baffles (17) each have a rear cavity baffle hole (17a) penetrating the plurality of rear cavity baffles (17), and adjacent rear cavity airbags (22) pass through the rear cavity baffle hole (17a) to fit each other.

10. The blade according to claim 1, characterized in that The front cavity airbag (21) and the rear cavity airbag (22) are distributed in a range of one third to four fifths of the distance from the blade root in the span direction of the blade. A protrusion is provided on the surface of each of the front chamber airbag (21) and the rear chamber airbag (22).

11. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a blade according to any one of claims 1 to 10.

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