A vibrating blade structure for vibratory de-icing

Abstract

The application relates to the technical field of fan blade deicing, and particularly discloses a vibrating piece structure for vibrating deicing, which comprises a keel and a plurality of rectangular fins; the plurality of rectangular fins are uniformly and linearly spaced and symmetrically arranged on the two sides of the length direction of the keel; and the width d of the keel is 1 / 4 to 1 / 5 of the width p of the rectangular fin. According to the scheme, the plurality of rectangular fins and the keel jointly form a skin, the plurality of fins are dispersedly distributed, the vibrating amplitude can be effectively improved under the action of the same magnetic field force, the deicing effect is improved while the engineering application is facilitated and the deicing area is large, and the problem that the existing solutions to the icing problem of the wind turbine blade cannot simultaneously consider the good deicing effect, the convenient engineering application and the large deicing area is solved.

Description

Technical Field

[0001] This application relates to the field of wind turbine blade de-icing technology, and in particular to a vibrating plate structure for vibration de-icing. Background Technology

[0002] Most of the wind-rich areas in southern my country are located in high-altitude mountainous areas and near lakes. Therefore, when the south experiences low-temperature and high-humidity environments such as winter, it is prone to low-temperature freezing damage, which causes the blades of wind turbines to become covered with ice.

[0003] Icing on wind turbine blades affects their aerodynamic profile, and uneven icing distribution causes unbalanced loads, leading to additional loads and vibrations on the turbine, reducing the lifespan of both the blades and the turbine itself, increasing the risk of turbine failure, and impacting power generation. Furthermore, operating wind turbines with icing on their blades can reduce power output by 10% to 20%, increasing wind farm operation and maintenance costs, and even causing partial damage or complete collapse of the tower. In addition, blade icing poses a significant safety hazard to personnel. Wind turbine blade icing has become a major concern for wind turbine operators in icing-prone areas.

[0004] Currently, the main solutions to the problem of icing on wind turbine blades include superhydrophobic coatings, thermal de-icing, and electrical pulse de-icing.

[0005] Superhydrophobic coatings are applied to the blade surface using superhydrophobic materials to prevent ice buildup. While the anti-icing process is simple and convenient, its anti-icing effect and aging resistance are poor, making it difficult to implement in engineering applications.

[0006] One thermal de-icing solution is to use the electric heating generated by the wind turbine itself for anti-icing and de-icing. In this method, the melted water flowing to the unheated low-temperature surface may refreeze and form a lot of ice around the heated area. Another solution is to use hot air to form a high-temperature layer on the blade surface to achieve anti-icing and de-icing. However, this requires high power and is difficult to de-ic the blade area far from the wind turbine tower, resulting in a small de-icing coverage area.

[0007] Electro-pulse de-icing typically involves placing a pulse coil within the skin. When de-icing is needed, the pulse coil discharges, creating a magnetic field around it. This time-varying magnetic field generates eddy currents on the skin, producing a pulse force that vibrates and removes the ice layer. However, in existing electro-pulse de-icing systems, the skin is generally arranged to completely cover the blade edges, resulting in a relatively small vibration amplitude and consequently, poor de-icing effectiveness. Summary of the Invention

[0008] In view of this, the purpose of this application is to provide a vibrating plate structure for vibration de-icing, which solves the problem that existing solutions for wind turbine blade icing cannot simultaneously achieve good de-icing effect, convenient engineering application and large de-icing coverage area.

[0009] To achieve the above technical objectives, this application provides a vibrating plate structure for vibration de-icing, comprising: a keel and multiple rectangular fins;

[0010] The rectangular fins are evenly spaced in a straight line and symmetrically arranged on both sides of the keel along its length.

[0011] The width d of the keel is 1 / 5 to 1 / 4 of the width ρ of the rectangular fin.

[0012] Furthermore, the width d of the keel is 1 / 5 of the width ρ of the rectangular fin.

[0013] Furthermore, the length h of the rectangular fin along the length direction of the keel is 1 / 2 of the width ρ of the rectangular fin.

[0014] Furthermore, the center distance between two adjacent rectangular fins on the same side of the keel is c, and the following size constraint formula applies:

[0015] 1 / 3(ρ-d)≤c≤1 / 2(ρ-d).

[0016] Furthermore, it also includes extension components;

[0017] The extension component is a single piece;

[0018] Both the keel and the rectangular fins are disposed on the extension member.

[0019] Furthermore, the extension element is a polytetrafluoroethylene film.

[0020] Furthermore, the thickness of the fins is the same as that of the keel.

[0021] Furthermore, both the fins and the keel are made of aluminum.

[0022] As can be seen from the above technical solutions, this application provides a vibrating plate structure for vibration de-icing, including: a keel and a plurality of rectangular fins; the plurality of rectangular fins are evenly spaced in a straight line and symmetrically arranged on both sides of the length direction of the keel; the width d of the keel is 1 / 4 to 1 / 5 of the width ρ of the rectangular fins.

[0023] This solution uses multiple rectangular fins and a keel to form a skin. Because the multiple fins are distributed in a dispersed manner, they have a larger vibration amplitude under the same magnetic field force. This achieves both convenient engineering application and large de-icing coverage area while improving the de-icing effect. It effectively solves the problem that existing solutions for wind turbine blade icing cannot achieve good de-icing effect, convenient engineering application and large de-icing coverage area. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A planar structural diagram of a vibrating plate structure for vibration de-icing provided in an embodiment of this application is shown below. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments in this application specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0027] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0029] Please refer to Figure 1 , a vibrating plate structure for vibration de-icing provided in the embodiments of the present application comprises a keel 1 and a plurality of rectangular fins 2; the plurality of rectangular fins 2 are uniformly distributed at linear intervals and symmetrically arranged on both sides of the keel 1 in the length direction; the width d of the keel 1 is 1 / 5 to 1 / 4 of the width ρ of the rectangular fins 2.

[0030] Specifically, the plurality of rectangular fins 2 and the keel 1 form a structure in the shape of the Chinese character "feng" (丰), which can realize vibration in a larger range, thereby improving the de-icing effect. Both the keel 1 and the rectangular fins 2 can be made of aluminum material.

[0031] To ensure that a shear force acting on the ice layer can be formed when the rectangular fins 2 vibrate, the thickness of the rectangular fins 2 can be set to be the same as that of the keel 1, both being 2-3mm, so that in practical applications, both can be cut from the same aluminum plate. The length of the keel 1 is designed in combination with the ice-covered length of the blade; since the ice on the blade generally accumulates at the root of the blade with a length of 3-5m, the length of the keel 1 can be set to be equal to the ice-covered length.

[0032] The value of ρ is related to the ice-covered width of the blade. Since the ice on the blade is mainly concentrated at the edge of the windward side of the blade, if the ice-covered width does not exceed 10cm according to actual observation, ρ can be 5-8cm, and standard parts can be manufactured according to this size.

[0033] For the convenience of description, in this embodiment, the dimension in the length direction of the keel 1 is taken as the length of the keel 1 and the rectangular fins 2; correspondingly, Figure 1 the dimension on the plane perpendicular to the length direction of the keel 1 is taken as the width of the keel 1 and the rectangular fins 2. The width d of the keel 1 is related to the width ρ of the rectangular fins 2. In this embodiment, the ratio of d to ρ is 1 / 5 to 1 / 4; if the ratio is too large, the width ρ of the rectangular fins 2 is relatively narrow relative to the overall structure, and the vibration amplitude is limited; if the ratio is too small, the keel 1 is prone to lose the constraint on the rectangular fins 2, and after multiple vibrations, the rectangular fins 2 will most likely change from elastic deformation to plastic deformation, making it difficult to return to their original positions. The inventors have found that the ratio of d to ρ is preferably 1 / 5 to 1 / 4, and more preferably, setting the width d of the keel 1 to 1 / 5 of the width ρ of the rectangular fins 2 can ensure a good vibration de-icing effect while ensuring that the rectangular fins 2 are stably connected to the keel 1.

[0034] In one embodiment, the length h of the rectangular fin 2 along the length direction of the keel 1 is 1 / 2 of the width ρ of the rectangular fin 2.

[0035] Specifically, the length h of the rectangular fin 2 is related to the natural frequency.

[0036] The natural frequency f of the rectangular fin 2 refers to the natural frequency of cantilever beam vibration, and can be calculated according to the following formula:

[0037]

[0038] k is the square root of the ratio of aluminum's elastic modulus to its density. Substituting this value, we can obtain its natural frequency. The pulse frequency of the coil can be selected according to this value.

[0039] The length h of the rectangular fin 2 cannot be too large or too small. If it is too small, the magnetic force of the rectangular fin 2 will be too small, and it will not be able to generate a large range of shear force during vibration. If it is too large, it will be similar to the complete skin, and it will not achieve the purpose of saving materials and improving the de-icing effect. At the same time, its vibration frequency will no longer conform to the cantilever vibration model. Therefore, in this embodiment, h = 1 / 2ρ is taken to ensure that the rectangular fin 2 meets the application requirements.

[0040] Furthermore, the center distance between two adjacent rectangular fins 2 on the same side of the keel 1 is c, and the following dimensional constraint formula applies:

[0041] 1 / 3ρ-d≤c≤1 / 2ρ-d.

[0042] Specifically, due to the constraints of the keel 1 and considering that the vibration of the rectangular fin 2 should be elastic deformation, in application, the vibration enhancement can be achieved by controlling the repetition frequency of the coil pulse current. Specifically, the vibration amplitude of the fin edge should generally not exceed half the width of the fin, that is, the vibration amplitude of the rectangular fin 2 should be controlled within the range of 1 / 3 to 1 / 2 (ρ-d).

[0043] The value of c, which is the center distance between two adjacent rectangular fins 2 on the same side of the keel 1, is related to the vibration amplitude of the rectangular fin 2. Therefore, setting the value of c to 1 / 3 to 1 / 2 (ρ-d) can meet the vibration requirements of the rectangular fin 2.

[0044] In practical applications, since the vibrating plates are spatially distributed, de-icing needs to be carried out when the ice layer has a certain thickness. Otherwise, the ice layer on the upper part of the rectangular fin 2 will be sheared off, but the ice layer between the rectangular fins 2 and on the connecting frame will not be dislodged. De-icing usually begins when the ice layer thickness reaches 5mm.

[0045] Taking a wind turbine blade root icing length not exceeding 3m and a maximum icing width not exceeding 32cm as an example: Rectangular fins 2 are arranged at the blade root, and the keel 1 is 3m long. All thicknesses are taken as 2mm. ρ is taken as 32cm, d as 6.4cm, h as 16cm, and c as 12.8cm. The elastic modulus of aluminum is 70GPa, and its density is 2.3g / cm³. Based on the natural frequency, the calculated frequency is 1923.6Hz, which is used as the pulse frequency.

[0046] In other embodiments, an extension element is also included; the extension element is a single piece; the keel 1 and the rectangular fin 2 are both disposed on the extension element.

[0047] The keel 1 and rectangular fins 2 are mounted on the extension to prevent ice from falling onto the blades through the gaps in the rectangular fins 2.

[0048] In applications, the stretchable part can be a polytetrafluoroethylene film, or other film materials that are stretchable within a temperature range of -20°C to 10°C.

[0049] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although this application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vibrating plate structure for vibration de-icing, characterized in that, comprising: a keel (1) and a plurality of rectangular fins (2); the plurality of rectangular fins (2) are uniformly distributed at linear intervals and symmetrically arranged on both sides of the keel (1) in the length direction; the plurality of rectangular fins (2) and the keel (1) form a skin structure in the shape of the Chinese character "feng"; the width d of the keel (1) is 1 / 5 to 1 / 4 of the width ρ of the rectangular fin (2); the length h of the rectangular fin (2) along the length direction of the keel (1) is 1 / 2 of the width ρ of the rectangular fin (2); the thickness of the fin (2) is consistent with that of the keel (1); both the fin (2) and the keel (1) are made of aluminum; the center distance between two adjacent rectangular fins (2) on the same side of the keel (1) is c, and the following dimensional restriction formula is satisfied: 1 / 3(ρ-d) ≤ c ≤ 1 / 2(ρ-d).

2. The vibrating plate structure for vibration de-icing according to claim 1, characterized in that, The width d of the keel (1) is 1 / 5 of the width ρ of the rectangular fin (2).

3. The vibrating plate structure for vibration de-icing according to claim 1, characterized in that, further comprising an extension member; the extension member is of one-piece construction; both the keel (1) and the rectangular fins (2) are disposed on the extension member.

4. The vibrating plate structure for vibration de-icing according to claim 3, characterized in that, The extension member is a polytetrafluoroethylene film.

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