CN116696692A - Vibrating piece structure for vibration deicing - Google Patents

Abstract

The application relates to the technical field of fan blade deicing, and particularly discloses a vibrating piece structure for vibration deicing, which comprises the following components: keels and fin groups; the fin group comprises a plurality of fins; the fins are in a rose shape; the fins are arranged on the keels at equal intervals in a straight line and are symmetrically arranged along the length direction of the keels. According to the scheme, the fins which are symmetrically distributed along the straight lines of the keels can cover most areas of the edges of the blades and increase vibration amplitude to improve deicing effect, engineering application is facilitated, and the problems that an existing solution to the problem of icing of the blades of the wind driven generator cannot achieve good deicing effect, engineering application is facilitated and the deicing area can be covered is effectively solved.

Description

A vibration plate structure for vibration deicing

technical field

The present application relates to the technical field of fan blade deicing, in particular to a vibrating plate structure for vibrating deicing.

Background technique

Most of the wind resource-rich areas in southern my country are located near high-altitude mountains and lakes. Therefore, when the south is in a low-temperature and high-humidity environment such as winter climate, it is easy to encounter low-temperature freezing damage, which makes the blades of wind turbines covered with ice.

The icing phenomenon of wind turbine blades will affect the aerodynamic profile of the blades, and the uneven distribution of ice-coated mass will cause unbalanced loads, which in turn will cause additional loads and vibrations of wind turbines, reducing the service life of blades and units. It is easy to cause unit failure and affect the power generation of the wind farm. At the same time, the operation of wind turbine blades hanging on ice will reduce the power generation of wind turbines by 10% to 20%, which will increase the operation and maintenance costs of wind farms, and even cause partial damage or overall collapse of wind towers. In addition, ice throwing by the blades also poses a greater hidden danger to personnel safety. Icing of wind turbine blades has become a concern of wind turbines in ice-covered areas.

At this stage, the solutions to the icing problem of wind turbine blades mainly include the installation of super-hydrophobic coatings, thermal deicing and electric pulse deicing.

The super-hydrophobic coating is coated on the surface of the blade with super-hydrophobic materials to achieve the goal of preventing ice coverage. The anti-icing operation is simple and convenient, but its anti-icing effect and aging resistance are poor, and it is difficult to realize engineering applications.

One of the solutions for thermal deicing is to use the electric heating anti-icing and deicing that uses the wind turbine itself to generate electricity. In this method, the melted water in the deicing process may re-freeze when it flows to the unheated low-temperature surface, and forms around the heated area. More icing, another solution is to use hot air to form a high-temperature layer on the surface of the blade to achieve anti-icing and deicing, but the power requirements for the power supply are high, and it is difficult to achieve deicing in the blade area that is far away from the fan tower. This results in a smaller de-icing area that can be covered.

The scheme of electric pulse deicing is generally to set a pulse coil in the skin, and when deicing is required, the pulse coil discharges, so that a magnetic field is formed around the pulse coil; the magnetic field that changes with time will form an eddy current on the skin, thereby generating ice. The impulse force of vibration to remove. However, in the existing electric pulse deicing scheme, the skin is generally arranged in such a way as to fully cover the edge of the blade, resulting in a small vibration amplitude of the skin, which in turn makes the deicing effect poor.

Contents of the invention

In view of this, the purpose of this application is to provide a vibrating plate structure for vibrating deicing, which is used to solve the problem of icing the blades of wind power generators. Problems covering large deicing areas.

In order to achieve the above technical purpose, this application provides a vibrating plate structure for vibrating deicing, including: keel and fin set;

The set of fins includes a plurality of fins;

The fins are rosette-shaped;

A plurality of the fins are arranged in a straight line and evenly spaced on the keel, and arranged symmetrically along the length direction of the keel.

Further, the fin group includes two groups;

The two sets of fins are respectively arranged on the top surface and the bottom surface of the keel.

Further, the fins on the two sets of fins are overlapped and staggered along the length direction of the keel.

Further, the edge curve equation of the fin is: ρ=cos(2θ), where ρ is the width of the fin, and θ takes a value from -π/4 to π/4.

Further, the end vertices of the fins are located on the center line of the keel along the length direction;

The width d of the keel is 1/5 to 1/3 times of ρ.

Further, the width d of the keel is 1/4 times of ρ.

Further, the center-to-center distance between the fins and adjacent fins along the length direction of the keel 1 is 1/2h to 3/4h;

h is the length of the fin.

Further, the center-to-center distance between the fins and the fins on another group of adjacent fin groups is 2/3h.

Further, the length h of the fin is equal to the width ρ of the fin times.

Further, the fins are aluminum sheets.

It can be seen from the above technical solutions that the present application provides a vibrating sheet structure for vibrating deicing, including: a keel and a fin set; the fin set includes a plurality of fins; the fins are rosette-shaped; A plurality of the fins are arranged in a straight line and evenly spaced on the keel, and arranged symmetrically along the length direction of the keel.

This scheme uses a plurality of fins arranged symmetrically along the straight line of the keel, which can cover most of the edge of the blade and increase the vibration amplitude to improve the deicing effect, which is convenient for engineering application and effectively solves the existing problem of icing on wind turbine blades. The solution cannot take into account the problems of good deicing effect, convenient engineering application and large deicing area.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a top view of a vibrating plate structure for vibrating deicing provided by an embodiment of the present application.

Detailed ways

The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the specification of this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the scope of protection claimed in this application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer " and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Constructed and operative in a particular orientation and therefore should not be construed as limiting to the embodiments of the present 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.

In the description of the embodiments of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a Replaceable connection, or integral connection, can be mechanical connection or electrical connection, direct connection or indirect connection through an intermediary, or internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

Please refer to Fig. 1, a vibrating plate structure for vibrating deicing provided in the embodiment of the present application, including: a keel 1 and a fin group; the fin group includes a plurality of fins 2; the fins 2 are rose-shaped; A plurality of fins 2 are arranged on the keel 1 at regular intervals in a straight line, and are arranged symmetrically along the length direction of the keel 1 .

For the convenience of description, in this application, the keel 1 is placed along the x-axis direction in FIG. 1 for illustration; that is, the x-axis direction in FIG. 1 is the length direction, and the y-axis direction is the width direction.

During installation, the length direction of the keel 1 can be aligned with the edge line of the blade, and then the fins 2 on both sides of the keel 1 are respectively installed on both sides of the blade.

The fact that the fins 2 are rose-shaped means that the shape of the fins 2 is similar to rose petals. Specifically, a coil can be installed under the keel 1 and the fin group; multiple rose-shaped fins 2 are discharged along the length direction of the keel 1, on the one hand, the vibration range can be increased, and on the other hand, compared with the integral type The skin can effectively increase the vibration amplitude, thereby improving the deicing effect.

At the same time, the existing integral skin needs to arrange a long current path, so that the eddy current on the skin covers the whole skin, so that the current loss is relatively large and the current magnitude is reduced. In this solution, a plurality of fins 2 protruding relative to the keel 1 can be used to confine most of the eddy currents in the fins 2, thereby reducing eddy current loss and providing a larger magnetic field.

In this solution, the fins 2 can be aluminum sheets with a thickness of 2 mm; the ice-covered position of the fan blade is generally at its root, so the keel 1 can be set at the corresponding ice-covered position, and the length of the keel 1 is equivalent to the ice-covered length.

In one embodiment, the fin group includes two groups; the two groups of fin groups are respectively arranged on the top surface and the bottom surface of the keel 1 .

By arranging two sets of fins, in the same set of fins, two adjacent fins do not need to be arranged in contact, thereby reducing the difficulty of production in practical applications.

Specifically, in the process of installing the keel 1 and the fin 2 on the blade after production, it is necessary to make the gap between the fin 2 and the fin 2 as small as possible, so as to avoid part of the ice or liquid from icing. The gap between the fins 2 falls off. In this solution, by arranging two sets of fin groups, it is possible to avoid the difficulty of production due to too small intervals between the fin groups located on the same side of the keel 1 .

As a further improvement, in order to avoid excessive gaps between adjacent fins 2 after installation, in this embodiment, the fins 2 on one group of fins and the fins 2 on the other group of fins along the keel The length direction of 1 is overlapped and staggered.

In one embodiment, the edge curve equation of the fin 2 is: ρ=cos(2θ), where ρ is the width of the fin 2, and θ ranges from -π/4 to π/4.

Specifically, the commonly used curve equation of the rose curve is: ρ=acos(nθ); among them, a is a coefficient, corresponding to the maximum length of ρ; θ corresponds to the opening angle of the rose line; n is a natural number. The common value of θ is -π/6 to π/6; however, the inventors found that when the value of θ exceeds -π/4 to π/4, the shape of the fin 2 is too narrow and long, so it is necessary to manufacture more quantity. According to the length of ice coating on the existing wind turbine blades in the actual application process, the inventor selects a=1 and n=2.

Carry out calculation and experiment according to the edge curve equation of above-mentioned fin 2, be the width ρ of fin 2 when the length h of fin 2 When doubled, a better vibration effect can be obtained.

It should be noted that, in , θ is ±arctan(sqrt(5)/5).

In a more specific embodiment, the center-to-center distance between the fin 2 and the adjacent fin 2 along the length direction of the keel 1 is 1/2h to 3/4h; h is the length of the fin 2 .

Specifically, the fins 2 and the adjacent fins 2 along the length direction of the keel 1 may belong to the same fin group, or may belong to different fin groups. In this embodiment, the two adjacent fins 2 along the length direction of the keel 1 are respectively from two groups of fins on the top surface and the bottom surface of the keel 1 .

In application, the inventors found that the distance between the centers of two adjacent fins 2 along the length direction of the keel 1 is 1/2h to 3/4h, which can keep the proper distance between the two fins 2 and avoid mutual If the gap between two adjacent fins 2 is too large, there is a risk of ice covering the gap, and at the same time, it can be avoided that the gap between two adjacent fins 2 is too small and the arrangement of the fins 2 is too dense.

Preferably, in one embodiment, the center-to-center distance between the fins 2 and the fins 2 on another group of adjacent fins is 2/3h, which can ensure that the arrangement of the fins 2 is not too dense, At the same time, there are no holes and slots between adjacent fins 2 .

On the basis of the above-mentioned embodiments, in this application, the apex of the end of the fin 2 is located on the center line of the keel 1 along the length direction; the width d of the keel 1 is related to ρ, which is 1/5 to 1/3 times of ρ .

Preferably, the width d of the keel 1 is 1/4 times of ρ.

Specifically, after the fins 2 are installed on the keel 1, the total width of the structure is 2ρ. When the ratio of d to ρ is too large, the fin 2 needs to protrude from the keel 1 to a greater length to ensure the vibration amplitude; while the ratio of d to ρ is too small, it is easy to lose the constraint on the fin 2, and the Afterwards, it is likely to change from elastic deformation to plastic deformation. Therefore, in this embodiment, d=1/4ρ can have a better vibration effect and ensure the binding force of the keel 1 on the fins 2 . Wherein, the fins 2 can be installed on the keel 1 by riveting.

In the above-mentioned embodiments, ρ can be set according to the maximum width of the actual icing situation; a value of ρ can also be fixed, and a corresponding induction detection device can be installed on the blade. Ice device for deicing.

The above are only preferred embodiments of the present application, and are not intended to limit the present invention. Although the present 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 perform equivalent replacements for some of the technical features, but any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims (10)

1. A vibrating reed structure for vibration deicing, characterized by comprising: the keels (1) and the fin groups;

the fin group comprises a plurality of fins (2);

the fins (2) are in a rose shape;

the fins (2) are arranged on the keels (1) at equal intervals in a straight line, and are symmetrically arranged along the length direction of the keels (1).

2. Vibrating piece structure for vibratory deicing of claim 1, wherein said fin group comprises two groups;

the two groups of fins are respectively arranged on the top surface and the bottom surface of the keel (1).

3. Vibrating reed structure for vibration deicing according to claim 2, characterized in that the fins (2) on two of the fin groups are overlapped and staggered along the length direction of the keel (1).

4. Vibrating reed structure for vibratory deicing as in claim 1, characterized in that the edge curve equation of the fin (2) is: ρ=cos (2θ), where ρ is the width of the fin (2) and θ takes a value of-pi/4 to pi/4.

5. Vibrating reed structure for vibratory deicing as in claim 4, characterized in that the end apex of the fin (2) is located on the center line of the keel (1) in length direction;

the width d of the keel (1) is 1/5 to 1/3 times of rho.

6. Vibrating reed structure for vibratory deicing as in claim 5, characterized in that the width d of the keel (1) is 1/4 times p.

7. Vibrating reed structure for vibratory deicing according to any one of claims 4 to 6, characterized in that the center-to-center distance between the fin (2) and the fin (2) adjacent in the length direction of the keel 1 is 1/2h to 3/4h;

h is the length of the fin (2).

8. Vibrating reed structure for vibration deicing according to claim 7, characterized in that the centre-to-centre distance between the fins (2) and the fins (2) on the adjacent other set of fins is 2/3h.

9. Vibrating reed structure for vibratory deicing according to claim 7, characterized in that the length h of the fin (2) is v 6/9 times the width ρ of the fin (2).

10. Vibrating reed structure for vibratory deicing as in claim 1, wherein said fins (2) are aluminum sheets.