Wind turbine blade capable of resisting bending and wind power generation device

Abstract

The utility model discloses a wind turbine blade capable of resisting bending and a wind power generation device. The blade comprises a shell, a plug partition plate and an elastic cavity. The plug partition plates are arranged at the head end and the tail end of a blade cavity formed by the shell, and a closed cavity is formed by the plug partition plates and the shell. The elastic cavity is formed in the closed cavity and extends in the length direction of the blade, and after the elastic cavity is filled with fluid, the elastic cavity makes contact with the plug partition plate and the shell. An elastic cavity is formed in a cavity of a blade, fluid is filled into the elastic cavity to form a fluid power device of an expansion pressure space, and after the outside of the blade is subjected to the action of airflow and various loads, the fluid power device builds a novel cavity structure with the air pressure larger than the natural environment into the blade. The expansion pressure inside and outside the cavity can be automatically adjusted to resist bending deformation of the blade, and meanwhile, the elastic cavity is prevented from extending towards the opening of the blade root and the solid part, without the cavity, of the blade tip to cause breakage of the elastic cavity by arranging the plug partition plate.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine blade shape control, in particular to a wind turbine blade capable of resisting bending and a wind power generation device. Background Art

[0002] Currently, wind turbines are developing in the direction of larger size and higher power. As the size increases, the blade structure and loads are becoming increasingly complex, leading to increasingly serious blade damage problems. Among the various damage mechanisms of existing wind turbine blades, structural buckling and fracture instability can lead to the entire blade breaking, and some even directly sweeping the tower, causing the entire machine to collapse and cause a major safety accident. In the fierce market competition environment, how to carry out technological innovation on traditional structural blades at the lowest possible cost, reduce blade weight and cost, and achieve good anti-buckling and anti-fracture performance is a key technical requirement of the blade design industry. Blade quality and performance are of great significance to the healthy development of the wind power industry.

[0003] Examples are given to reflect the current methods and measures in this field to solve the above technical needs, thereby illustrating the need to continue to seek solutions.

[0004] For example, Chinese patent publication number CN114718802A discloses an improved method for the anti-buckling phenomenon of existing horizontal axis wind turbine blades. The method includes the following steps: evaluating the buckling characteristics of existing wind turbine blades with buckling problems, determining the area where the blade buckling phenomenon occurs, and designing a single or several anti-buckling reinforcement structural components based on the structural characteristics of the blade in the area, performing on-site technical transformation work on the blade buckling area, and installing anti-buckling reinforcement structural components to ensure that the existing blades meet the anti-buckling performance requirements. Using this technology, the anti-buckling performance of wind turbine blades that are in service and have buckling problems can be improved through technical transformation. The anti-buckling performance of wind turbine blades is improved without changing the aerodynamic shape and original layer of the blades, and will not have a negative impact on the performance of the blades. It can be seen that this is an on-site reinforcement technical measure, which is an enhancement technical measure for the local bending resistance of the blade structure. It is a measure to strengthen and improve the weak points found after operation. It does not involve how to suppress the overall bending of the rear half or end of the long blade.

[0005] For example, Chinese Patent Publication No. CN114580247A describes a method for designing a buckling-resistant reinforcement structure for horizontal-axis wind turbine blades. Among various blade damage mechanisms, buckling instability, which can lead to complete blade failure, is a serious damage scenario. Current approaches to addressing blade buckling involve modifying the blade's ply structure and adjusting its stiffness to prevent buckling. While this approach can prevent buckling, it requires significant adjustments to the blade's structural design, increasing its weight and cost. To address this issue, a method for analyzing, designing, and evaluating buckling-resistant reinforcement structures is proposed, without significantly altering the blade's main structure, weight, or cost. The method includes the following steps: analyzing the buckling characteristics of a wind turbine blade to determine whether buckling is occurring; if so, determining the area where the buckling occurs; and designing one or more buckling-resistant reinforcement components based on the blade's structural characteristics in that area. The blade with the enhanced structural component installed is re-analyzed for buckling to determine whether buckling still occurs in the modified blade. Based on the results of the re-analysis and evaluation, it is determined whether the modified blade meets the anti-buckling performance requirements, or the enhanced structural component is further improved until satisfactory analysis and evaluation results are achieved.

[0006] To address the significant vibration and deformation of wind turbine blades, current methods include increasing the thickness of the blade composite material in the blade layup to improve blade stiffness. However, this approach increases blade weight, thereby increasing the manufacturing and installation costs of the wind turbine. Regarding design, to ensure a safe distance between the blades and the tower, current blades are pre-bent. For a 6MW wind turbine in the 100-meter range, the tip clearance of the pre-bent blades can be as much as 4 meters. However, this practice alters the aerodynamic characteristics of the blades, thereby reducing the turbine's power output and severely impacting the economic viability of wind power generation. Regarding operational strategies, wind turbine blades are pitch-controlled to reduce wind loads. While this approach can reduce vibration, it also reduces the windward area of the wind turbine blades, resulting in reduced power generation efficiency. Furthermore, in the face of extreme gusts and sudden changes in wind direction, the blade pitch system is constrained by inertia and has little time to react (i.e., the inherent problem of slow frequency response), making it impossible for the blades to avoid the significant vibration caused by these extreme loads. Utility Model Content

[0007] In view of this, the purpose of the embodiments of the present invention is to provide a wind turbine blade and a wind power generation device that can resist bending, so as to solve the technical problem in the prior art that blades are bent and broken due to excessive blade size.

[0008] To achieve the above-mentioned object, in a first aspect, the present invention provides a wind turbine blade capable of resisting bending, the blade comprising a shell, a plug partition and an elastic cavity;

[0009] The plugging baffle is arranged at the head end and the tail end of the blade cavity formed by the shell, and forms a closed cavity with the shell;

[0010] The elastic cavity is arranged in the closed cavity and extends along the length direction of the blade. When the elastic cavity is filled with fluid, the elastic cavity contacts the plug partition and the shell.

[0011] The elastic cavity is provided with a pressure sensor for measuring the pressure value on the elastic cavity in real time.

[0012] In some possible implementations, the wind turbine blade further includes: a fluid replenishing device, disposed at the root of the blade, for adjusting the capacity of the fluid in the elastic cavity according to the bending amount of the blade;

[0013] In some possible implementations, the elastic cavity is provided with a filling port, and the fluid replenishing device fills the elastic cavity with fluid through the filling port; the fluid is liquid or gas.

[0014] In some possible implementations, the fluid replenishment device includes an air pump, an air supply pipeline, an outlet pressure flow transmitter, a drive motor, and an air source controller; one end of the air supply pipeline is connected to the air pump, and the drive motor is mounted on the air pump; the outlet pressure flow transmitter is electrically connected to the air source controller;

[0015] The outlet pressure flow transmitter is used to feed back the pressure flow of the outlet of the air supply pipeline to the air source controller;

[0016] The air source controller is used to input a control signal to the driving motor according to the pressure flow of the outlet of the air supply pipeline;

[0017] The driving motor is used to control the air pump to replenish fluid to the elastic cavity through the air supply pipeline according to the control signal.

[0018] In some possible implementations, the further comprising: a bending distance sensor, disposed on the outer wall of the tower relative to the tip of the blade passing across the windward direction of the tower of the wind turbine, for measuring the bending amount of the blade;

[0019] The air source controller adjusts the expansion pressure in the elastic cavity according to the bending amount.

[0020] In some possible implementations, the device further includes: a bending load sensor, disposed on the shell, for measuring the load on the blade.

[0021] In some possible implementations, the air source controller is configured to determine whether to add fluid to the elastic cavity according to the load amount, the bending amount, and a pressure value measured by a pressure sensor on the elastic cavity;

[0022] When the pressure value measured by the pressure sensor on the elastic cavity is lower than the pressure value that causes the bending amount of the shell to recover, the fluid replenishing device is controlled to fill the elastic cavity with fluid to automatically adjust the expansion pressure of the elastic cavity from the inside to the outside.

[0023] In some possible implementations, the blade further includes an air inlet pipe disposed in a cavity formed by the shell;

[0024] A check valve or an electrically controlled valve is provided on the air intake pipe, and the check valve or the electrically controlled valve is connected to the filling inlet of the elastic cavity, and is used to replenish the fluid in the elastic cavity;

[0025] It also includes a control bus of the electronically controlled valve, which is used to control the opening and closing of the electronically controlled valve.

[0026] In some possible implementations, the elastic cavity is further provided with an exhaust solenoid valve for discharging the fluid in the elastic cavity to reduce the expansion pressure of the elastic cavity from the inside to the outside.

[0027] It also includes a control bus of the exhaust solenoid valve, which is electrically connected to the exhaust solenoid valve and is used to control the opening and closing of the solenoid valve.

[0028] In a second aspect, the present invention further provides a wind power generation device capable of resisting blade bending, wherein the wind power generation device comprises a wind turbine blade capable of resisting bending as described in the first aspect.

[0029] The above technical solution has the following beneficial effects:

[0030] The utility model provides a wind turbine blade and a wind power generation device capable of resisting bending, the blade comprising a shell, a plugging baffle and an elastic cavity; the plugging baffle is arranged at the head and end of the blade cavity formed by the shell and forms a closed cavity with the shell; the elastic cavity is arranged in the closed cavity and extends along the length of the blade. When the elastic cavity is filled with fluid, the elastic cavity contacts the plugging baffle and the shell. By arranging the elastic cavity in the blade cavity and filling the elastic cavity with fluid to construct an expansion pressure space, a fluid dynamic device is provided. When the blade is subjected to airflow and various loads, the fluid dynamic device establishes a new cavity structure inside the blade with a pressure greater than the natural environment. The pressure in the new cavity structure can automatically adjust the outward expansion pressure in the cavity according to the wind speed in the natural environment of the wind turbine to resist blade bending deformation. At the same time, the plugging baffle is provided to prevent the elastic cavity from extending toward the open part of the blade root and the solid part of the blade without the cavity, which may cause the elastic cavity to rupture. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic structural diagram of a wind turbine blade with a function of resisting blade bending provided by the present invention;

[0033] Figure 2 This is a structural schematic diagram of a fluid replenishing device provided by the utility model;

[0034] Figure 3 This is a structural diagram of the connection between an inflation pipe and an elastic cavity provided by the utility model;

[0035] Figure 4 It is a structural schematic diagram of a wind power generation device provided by the utility model.

[0036] Description of Figure Numbers:

[0037] 1. Blade; 10. Housing; 11. Partition; 12. Elastic cavity; 121. Pressure sensor; 122. Charging port; 122. Exhaust solenoid valve; 13. Enclosed cavity; 14. Fluid replenishment device; 141. Air pump; 142. Air supply pipeline; 143. Outlet pressure and flow transmitter; 144. Drive motor; 145. Air source controller; 15. Bending distance sensor; 16. Bending load sensor; 17. Charging pipeline; 171. Check valve or electronically controlled valve;

[0038] 21. Nacelle; 22. Hub; 23. Generator; 24. Fairing; 25. Tower with tower door; 26. Wind vane and anemometer; 201. Inflator; 202. Slip ring; 203. First connecting pipeline; 204. Second connecting pipeline; a. Magnet. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Figure 1 This is a schematic diagram of the overall structure of a wind turbine blade that can resist bending provided by the utility model, such as Figure 1 As shown, the blade 1 includes a shell 10, a plug partition 11 and an elastic cavity 12 ( Figure 1 Not shown in addition, Figure 1 The white oval in the figure indicates that the shell 10 has a certain thickness); the plug partition 11 is arranged at the head and end of the blade cavity formed by the shell 10, and forms a closed cavity 13 with the shell 10. In this embodiment, the blade includes a front cavity and a solid part of the blade without a cavity. The plug partition is set at the head and end of the front cavity part to separate the front cavity into a closed cavity 13; the elastic cavity 12 is set in the closed cavity 13 and extends along the length direction of the blade 1. When the elastic cavity 12 is filled with fluid, the elastic cavity 12 contacts the plug partition 11 and the shell 10. A pressure sensor is provided in the elastic cavity 12 for measuring the pressure in the elastic cavity 12 in real time.

[0041] The utility model provides an elastic cavity 12 in the blade cavity, and fills the elastic cavity 12 with fluid to construct a fluid dynamic device for an expansion pressure space. After the blade 1 is subjected to airflow and various loads outside, the fluid dynamic device establishes a new cavity structure inside the blade 1 with an air pressure greater than the natural environment pressure. The air pressure in the new cavity structure can automatically adjust the outward expansion pressure in the cavity according to the wind speed of the natural environment in which the wind turbine is located, so as to resist the bending deformation of the blade 1. At the same time, by providing a plug partition 11, the elastic cavity 12 is prevented from extending toward the open part of the blade root and the solid part of the blade without a cavity, which may cause the elastic cavity 12 to rupture and cause unnecessary losses.

[0042] In addition, in some embodiments, a protective cover is also provided on the outside of the elastic cavity 12; the initial shape of the elastic cavity 12 is any shape such as a cylinder or an elliptical cylinder, the length of the elastic cavity 12 is less than or equal to the length of the cavity of the blade 1, and the shape of the protective cover matches the shape of the cavity of the blade 1 where the protective cover is located. By providing a protective cover, this embodiment can, on the one hand, prevent the elastic cavity 12 from being damaged by friction with the inner surface of the shell 10, thereby increasing the service life of the elastic cavity 12; in addition, the elastic cavity 12 itself is made of an elastic material, which is also a fireproof material and has the function of withstanding the natural environment and the temperature and humidity changes of the four seasons and resisting aging; on the other hand, since the material of the protective cover can be a tough rubber material, after the elastic cavity 12 releases the fluid, the elastic cavity 12 can be taken out along the open direction of the root of the blade 1 for replacement or repair.

[0043] Figure 2 This is a schematic structural diagram of a fluid replenishing device provided by the present invention. Figure 2 As shown, in some embodiments, the wind turbine blade 1 further includes: a fluid replenishing device 14, which is arranged at the root of the blade 1, and is used to adjust the capacity of the fluid in the elastic cavity 12 according to the bending amount of the blade 1; a filling inlet is provided on the elastic cavity 12, and the fluid replenishing device 14 fills the fluid into the elastic cavity 12 through the filling inlet; the fluid is liquid or gas.

[0044] like Figure 2As shown, in some embodiments, the fluid replenishment device 14 includes an air pump 141, an air supply line 142, an outlet pressure flow transmitter 143, a drive motor 144, and an air source controller 145. One end of the air supply line 142 is connected to the air pump 141, and the drive motor 144 is mounted on the air pump 141. The outlet pressure flow transmitter 143 is electrically connected to the air source controller 145. The outlet pressure flow transmitter 143 is used to feed back the pressure flow at the outlet of the air supply line 142 to the air source controller 145. The air source controller 145 is used to input a control signal to the drive motor 144 based on the pressure flow at the outlet of the air supply line 142. The drive motor 144 is used to control the air pump 141 to replenish the elastic cavity 12 with fluid through the air supply line 142 based on the control signal. The embodiments of the present invention can provide a suitable fluid to the elastic cavity 12, so that the pressure generated from the inside out of the elastic cavity 12 is sufficient to resist the expansion pressure caused by the bending degree of various parts of the blade 1.

[0045] Figure 4 This is a schematic diagram of the structure of a wind power generation device provided by the utility model. Figure 4 As shown, the blade 1 further includes a bending distance sensor 15, which is disposed on the outer wall of the wind turbine tower, or on the inner wall of the elastic cavity 12, relative to the windward direction of the blade tip passing across the wind turbine tower, for measuring the bending amount of the blade 1. An air source controller 145 adjusts the expansion pressure within the elastic cavity 12 based on the bending amount. In this embodiment, the air source controller 145 stores a correspondence between the bending amount and the pressure value, with different bending amounts corresponding to different pressure values.

[0046] Specifically, during actual use, a fluid dynamic device provides fluid to the inside of the elastic cavity 12 to construct an expansion pressure space. After the blade 1 is affected by airflow and various loads outside, the fluid dynamic device establishes a new cavity structure inside the blade 1 with an air pressure greater than the natural environment. The air pressure inside the new cavity structure can automatically adjust the outward expansion pressure in the cavity according to the wind speed of the natural environment in which the wind turbine is located.

[0047] In this embodiment, the bending distance sensor 15 installed on the side wall of the tower 25 cooperates with the magnet a on the tip of the blade 1 to measure the distance and obtain the bending amount of the blade 1. When the tip of the blade 1 rotates and passes the windward direction (windward side) of the tower wall, the potential induced by the sensor coil on the tower wall is the largest when the distance is closest. A one-to-one correspondence is established between the induced potential and the distance between them, which serves as the basis for measuring the degree of bending of the blade 1, and also serves as one of the bases for the controller to automatically adjust the expansion pressure of the elastic cavity 12.

[0048] As an example, this embodiment can utilize the principle of electromagnetic induction to convert non-electrical quantities for distance measurement into changes in the self-inductance or mutual inductance of an electromagnetic coil. The windward surface of a metal tower (or gantry) serves as part of an eddy-current sensor. A coil is placed in blade 1. When an alternating high-frequency current flows through the coil, an alternating magnetic flux φ is generated. Due to this alternating magnetic flux, when blade 1 rotates close to the windward surface of the tower, the coil facing the tower generates an induced current on the metal surface and interior of the tower. This current, known as an eddy current, is closed within the metal surface and interior of the tower, and the metal conductor on the tower surface and interior is abstracted as a short-circuited coil. According to Lenz's law, the alternating magnetic flux φ1 generated by this eddy current will be in the opposite direction to the magnetic field generated by the coil in blade 1, reducing the coil's inductance. The smaller the spacing δ, the greater the reduction in coil inductance, meaning that φ1 resists changes in φ. Due to the eddy current magnetic field, the coil's equivalent impedance Z will change. The degree of change is related to the distance δ between the two and is a single-valued function: Z = F(δ). The measuring circuit converts the change in impedance into a change in voltage, thereby achieving the purpose of converting the distance δ into electrical quantity.

[0049] like Figure 4 As shown, in some embodiments, the blade 1 also includes: a bending load sensor 16, which is arranged on the shell 10, and is used to measure the load of the blade 1; an air source controller 145 is used to determine whether to replenish fluid into the elastic cavity 12 according to the load and bending amount according to the pressure value measured by the pressure sensor on the elastic cavity 12; when the pressure value measured by the pressure sensor on the elastic cavity 12 is less than the pressure value that restores the bending amount of the shell 10, the fluid replenishing device 14 is controlled to fill the elastic cavity 12 with fluid to automatically adjust the expansion pressure of the elastic cavity 12 from the inside to the outside.

[0050] In this embodiment, after the blade 1 is subjected to airflow and various loads, the elastic cavity 12 establishes a new cavity structure within the blade 1 with a pressure greater than the natural ambient pressure. The pressure within this new cavity structure automatically adjusts the outward expansion pressure within the cavity based on the wind turbine's power output, the ambient temperature, wind speed, and local atmospheric pressure. In this embodiment, changes in the wind farm's airflow temperature heat or cool the blade 1's shell 10, causing the elastic cavity 12 to expand or contract accordingly. Similarly, the atmospheric pressure of the wind turbine's natural environment also exerts varying pressures on the elastic cavity 12. Therefore, in this embodiment, air temperature and pressure serve as auxiliary input parameters for the adaptive regulator's feedback control to better control the expansion pressure within the elastic cavity 12. In this embodiment, after the blade 1 is subjected to airflow and various loads, the fluid dynamic device establishes a new cavity structure within the blade 1 with a pressure greater than the natural ambient pressure. The pressure within this new cavity structure automatically adjusts the outward expansion pressure within the cavity based on the wind turbine's power output, the ambient temperature, wind speed, and local atmospheric pressure.

[0051] Figure 3 This is a schematic diagram of the structure of the connection between the inflation pipe and the elastic cavity provided by the utility model, such as Figure 3 As shown, in some embodiments, the blade 1 further includes an air intake pipe 17, which is arranged in the cavity formed by the shell 10; a check valve or an electric-controlled valve 171 is provided on the air intake pipe 17, and the check valve or the electric-controlled valve 171 is connected to the filling inlet of the elastic cavity 12, and is used to replenish the fluid in the elastic cavity 12; and also includes a control bus of the electric-controlled valve 171, which is used to control the opening and closing of the electric-controlled valve 171.

[0052] In some embodiments, an exhaust solenoid valve 122 is also provided on the elastic cavity 12, which is used to discharge the fluid in the elastic cavity 12 to reduce the expansion pressure of the elastic cavity 12 from the inside to the outside. It also includes a control bus of the exhaust solenoid valve 122, which is electrically connected to the exhaust solenoid valve 122 and is used to control the opening and closing of the solenoid valve.

[0053] During actual use, when the pressure value inside the elastic cavity 12 is greater than the pressure value required for the shell 10 to restore the bending amount, the fluid in the elastic cavity 12 can be discharged through the exhaust solenoid valve 122 to adjust the expansion pressure in each section of the elastic cavity 12 in real time.

[0054] In this embodiment, the opening and closing of the electrically controlled valve 171 can be remotely controlled via the control bus of the electrically controlled valve 171, and the exhaust solenoid valve 122 can also be remotely controlled to allow the fluid within the elastic cavity 12 to flow out, thereby controlling the expansion pressure of the elastic cavity 12 from the inside out in real time to better resist the bending degree of the blade 1. Because excessive or redundant expansion pressure can also cause fatigue loads on the shell 10 of the blade 1, such as during the windless season, windless period, or long shutdown and maintenance period of the wind farm, this embodiment can remotely and in real time control the expansion pressure within the elastic cavity 12 through the electrically controlled valve 171 and the exhaust solenoid valve 122.

[0055] In addition, the present invention also provides a wind power generation device capable of resisting bending of blades 1 , and the wind power generation device includes any one of the above-mentioned wind turbine blades 1 capable of resisting bending.

[0056] like Figure 4As shown, the wind turbine generator includes: blades 1, a nacelle 21, a hub 22, a generator 23, a shroud 24, a tower with a tower door 25, a wind vane and anemometer 26, etc. In this embodiment, a built-in air source is disposed within the nacelle 21 and includes an air inflator 201, a slip ring 202, a first connecting pipe 203, and a second connecting pipe 204. The air inflator 201 is disposed within the nacelle 21 of the wind turbine and is connected to the slip ring 202 mounted on the hub 22 via the first connecting pipe 203. The slip ring 202 is connected to the fluid inlet of the elastic cavity 12 via the second connecting pipe 204. The air source controller 145 automatically controls the air inflator 201 according to the control model and the value of the pressure sensor 121 to adaptively adjust the volume of the fluid within each elastic cavity 12.

[0057] The wind turbine generator device of the present invention, by providing an elastic cavity 12 within the shell 10 of the blade 1, eliminates the effect of atmospheric pressure on the inner surface of the shell 10, or nearly so. The inner surface of the shell 10 can be supported according to rigidity requirements. Because the inner surface is supported by a nearly rigid surface, the inner surface of the shell 10 is no longer subject to significant reciprocating bending deformation in both directions. This prevents the outer surface of the shell 10 from bending, denting, or buckling toward the inner surface. Furthermore, a protective cover can be provided outside the elastic cavity 12. This cover, due to the sufficient gas within the elastic cavity 12, swells and its own rigid surface can resist the reaction force generated by external forces, balancing the pressure difference between the pressure and suction surfaces of the blade 1 and preventing the blade 1 from bulging or denting. This balance prevents deformation of the pressure and suction surfaces, reflecting the potential contribution of the pressure energy or potential energy generated by the sufficient gas within the elastic cavity 12. This is also known as the internal support that can resist bending of the blade 1, or a new structure that can resist bending of the blade 1. Since the blades 1 used in the wind power generation device in this embodiment have the function of resisting bending, the service life of the wind power generation device can be increased.

[0058] The embodiment of the present invention cooperates with the load sensor provided on the blade 1, the bending distance sensor 15 on the tower wall and the pressure sensor on the elastic cavity 12, so that the wind turbine blade 1 can adaptively adjust the structural design technology of the blade 1 to resist bending according to the load. By innovating the internal structure of the traditional wind turbine blade 1 and solving the current situation where the blade 1 is forced to bear bending load, the new structure of the blade 1 has the characteristics of light weight, active resistance to bending, suppression of blade 1 flapping, avoidance of tower sweeping, and at the same time adapting to the influence of natural environment wind speed, unit output, temperature and local atmospheric pressure on the fiberglass material of the blade 1 to actively regulate the stiffness of the blade 1.

[0059] Since the blades 1 used in the wind power generation device in this embodiment have the function of resisting bending, the service life of the wind power generation device can be increased.

[0060] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A wind turbine blade (1) capable of resisting bending, characterized in that: The blade (1) comprises a shell (10), a plug partition (11) and an elastic cavity (12); The plugging partition (11) is arranged at the head end and the tail end of the cavity formed by the shell (10), and forms a closed cavity (13) with the shell (10); The elastic cavity (12) is arranged in the closed cavity (13) and extends along the length direction of the blade (1). When the elastic cavity (12) is filled with fluid, the elastic cavity (12) contacts the plug partition (11) and the housing (10); A pressure sensor is provided on the elastic cavity (12) for measuring the pressure value on the elastic cavity (12) in real time.

2. A wind turbine blade (1) capable of resisting bending according to claim 1, characterized in that: The wind turbine blade (1) further comprises: a fluid replenishing device (14) arranged at the root of the blade (1) and used for adjusting the capacity of the fluid in the elastic cavity (12) according to the bending amount of the blade (1).

3. A wind turbine blade (1) capable of resisting bending according to claim 2, characterized in that: The elastic cavity (12) is provided with a filling port, and the fluid replenishing device (14) fills the elastic cavity (12) with fluid through the filling port; the fluid is liquid or gas.

4. A wind turbine blade (1) capable of resisting bending according to claim 2 or 3, characterized in that: The fluid replenishing device (14) comprises: an air pump (141), an air replenishing pipeline (142), an outlet pressure flow transmitter (143), a driving motor (144) and an air source controller (145); One end of the air supply pipeline (142) is connected to the air pump (141), and the drive motor (144) is installed on the air pump (141); the outlet pressure flow transmitter (143) is electrically connected to the air source controller (145); The outlet pressure flow transmitter (143) is used to feed back the pressure flow of the outlet of the air supply pipeline (142) to the air source controller (145); The air source controller (145) is used to input a control signal to the driving motor (144) according to the pressure flow rate of the outlet of the air supply pipeline (142); The driving motor (144) is used to control the air pump (141) to replenish fluid to the elastic cavity (12) through the air replenishment pipeline (142) according to the control signal.

5. A wind turbine blade (1) capable of resisting bending according to claim 4, characterized in that: It also includes: a bending distance sensor (15), which is arranged on the outer wall of the tower in the windward direction relative to the tip of the blade (1) passing through the tower of the wind turbine, and is used to measure the bending amount of the blade (1); The air source controller (145) adjusts the expansion pressure in the elastic cavity (12) according to the bending amount.

6. A wind turbine blade (1) capable of resisting bending according to claim 5, characterized in that: Also includes: A bending load sensor (16) is provided on the housing (10) and is used to measure the load of the blade (1).

7. A wind turbine blade (1) capable of resisting bending according to claim 6, characterized in that: The air source controller (145) is used to determine whether to add fluid to the elastic cavity (12) according to the load amount and the bending amount based on the pressure value measured by the pressure sensor on the elastic cavity (12); When the pressure value measured by the pressure sensor on the elastic cavity (12) is less than the pressure value that causes the bending amount of the shell (10) to be restored, the fluid replenishing device (14) is controlled to fill the elastic cavity (12) with fluid to automatically adjust the expansion pressure of the elastic cavity (12) from the inside to the outside.

8. A wind turbine blade (1) capable of resisting bending according to claim 1, characterized in that: The blade (1) further includes an air inlet pipe (17) disposed in a cavity formed by the housing (10); The air inlet pipe (17) is provided with a check valve or an electrically controlled valve (171), and the check valve or the electrically controlled valve (171) is connected to the filling inlet of the elastic cavity (12) and is used to replenish the fluid in the elastic cavity (12); It also includes a control bus of the electric-controlled valve (171), which is used to control the opening and closing of the electric-controlled valve (171).

9. A wind turbine blade (1) capable of resisting bending according to claim 1, characterized in that: The elastic cavity (12) is also provided with an exhaust solenoid valve (122) for exhausting the fluid in the elastic cavity (12) to reduce the expansion pressure of the elastic cavity (12) from the inside to the outside. It also includes a control bus of the exhaust solenoid valve (122), which is electrically connected to the exhaust solenoid valve (122) and is used to control the opening and closing of the exhaust solenoid valve (122).

10. A wind power generation device capable of resisting blade bending, characterized in that: The wind power generation device includes a wind turbine blade capable of resisting bending as described in any one of claims 1 to 9.

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