CN210068398U - Wind driven generator blade and wind driven generator set - Google Patents

Abstract

The utility model provides a aerogenerator blade and aerogenerator group, wherein the aerogenerator blade includes the blade casing and sets up first heating device and second heating device on the blade casing, and first heating device and second heating device are along the circumference interval arrangement of the wing section of blade casing, and first heating device and second heating device can carry out the heating operation alone to selectively the local heating to the blade casing, thereby can carry out the deicing to the icing position pertinence ground, avoided the energy extravagant.

Description

Wind driven generator blade and wind driven generator set

Technical Field

The utility model belongs to the technical field of wind-powered electricity generation, especially, relate to a wind turbine blade and wind generating set.

Background

Wind power is a new energy with great potential, and it has been estimated that the wind power resources available on earth for generating electricity are about 100 hundred million kilowatts, which is almost 10 times of the current hydroelectric generation capacity all over the world. At present, the energy obtained by burning coal every year around the world only accounts for one third of the energy provided by wind power in one year. Therefore, great importance is attached to the utilization of wind power to generate electricity at home and abroad, and new energy is developed. The principle of wind power generation is that wind power drives windmill blades to rotate, and the blades convert wind energy into rotating force for driving one or more generators, so that the wind energy is converted into electric energy through mechanical energy.

Wind power generation is the new energy which is widely applied at home and abroad at present, but due to climate change, particularly due to the fact that the weather of freezing rain increases in recent years, serious harm is caused. Due to the influence of freezing rain, icing phenomena can often occur on rotor blades of the wind driven generator, and the icing on the blades can influence the wing profiles of the blades, so that the aerodynamic performance of the blades is influenced, and the wind driven generator is greatly damaged.

SUMMERY OF THE UTILITY MODEL

The invention aims to provide a wind driven generator blade, which can heat the local part of the blade and reduce the power generation loss of the wind driven generator set in the icing period, thereby realizing energy conservation.

Another object of the present invention is to provide a wind turbine generator set to save energy.

To the above purpose, the present invention provides the following technical solutions:

according to an aspect of the present invention, there is provided a blade for a wind power generator, the blade for a wind power generator comprising a blade housing and a first heating device and a second heating device provided on the blade housing, the first heating device and the second heating device being arranged along a circumferential interval of a wing section of the blade housing, the first heating device and the second heating device being capable of performing a heating operation alone.

Still further, at least one of the first heating device and the second heating device is formed of an electrothermal phase change material.

Wherein the interval between the adjacent first heating device and the second heating device is 2-5 cm.

According to a specific embodiment of the present invention, the first heating device is disposed on the leading edge of the blade shell, the first heating device is formed of an electrothermal phase change material, and the first heating device follows the mold closing seam of the leading edge of the blade shell extends the same width to both sides in the chordwise direction of the blade shell.

Further, the width of the first heating device and the second heating device along the circumferential direction of the airfoil of the blade shell is 100 and 500 mm.

Specifically, the first heating device and the second heating device are electrically connected with the blade root heating control cabinet through two shielding power lines respectively, and multiple shielding layers of the shielding power lines are in equipotential connection.

According to the utility model discloses a concrete embodiment, aerogenerator blade still includes the lightning shielding layer, the lightning shielding layer covers first heating device with second heating device.

More preferably, both ends of the lightning shield layer in the axial direction of the blade shell are grounded, respectively.

According to the utility model discloses a concrete implementation mode, aerogenerator blade still includes insulating layer and protective layer, the insulating layer set up in the lightning shielding layer with between the first heating device, just the insulating layer set up in the lightning shielding layer with between the second heating device, the protective layer cladding the lightning shielding layer.

According to a specific embodiment of the present invention, the first heating device comprises a plurality of heating units or a single heating unit, and the plurality of heating units are connected in series or in parallel with each other; and/or

The second heating device comprises a plurality of heating units or a single heating unit, and the plurality of heating units are connected in series or in parallel with each other.

According to another specific embodiment of the present invention, the first heating device includes a first heating unit and a second heating unit which are disposed at an interval in a thickness direction of the blade shell, and the first heating unit and the second heating unit can perform heating operation independently; and/or the second heating device comprises a third heating unit and a fourth heating unit which are arranged at intervals along the thickness direction of the blade shell, and the third heating unit and the fourth heating unit can independently perform heating operation.

According to another aspect of the present invention, there is provided a blade for a wind power generator, the blade for a wind power generator including a blade shell and a first heating device and a second heating device provided on the blade shell, along a circumferential direction of a wing section of the blade shell, the first heating device and the second heating device are at least partially overlapped, and the first heating device and the second heating device are insulated from each other, and the first heating device and the second heating device can perform heating operation alone.

According to the utility model discloses an on the other hand provides a wind generating set, wind generating set includes the utility model provides a wind driven generator blade.

The utility model provides a aerogenerator blade and aerogenerator group's beneficial effect: the wind driven generator blade comprises a first heating device and a second heating device which are respectively and independently controlled, and the first heating device and the second heating device can be arranged at intervals along the circumferential direction of an airfoil of the blade shell, so that the first heating device or the second heating device can be independently heated to selectively heat the local part of the blade shell, ice can be removed from the icing part in a targeted mode, and energy waste is avoided.

Drawings

The above and/or other objects and advantages of the present invention will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

fig. 1 is a top view of a wind turbine blade provided in accordance with an exemplary embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a leading edge of a blade shell of the wind turbine blade of the drawings.

Description of the reference numerals

100. A blade shell; 200. A first heating device;

300. a second heating device; 400. A lightning shielding layer;

500. an insulating layer; 600. A blade root heating control cabinet;

700. shielding the power line; 800. And (4) surfacing felt.

Detailed Description

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like parts. The embodiments are described below in order to explain the present invention by referring to the figures.

The blade shell may include a pressure side shell and a suction side shell, and the pressure side shell and the suction side shell may be butted to form a complete blade shell, and a joint seam is formed at the joint of the pressure side shell and the suction side shell.

The phase change material is a substance which can change the state of the substance and provide latent heat under the condition of constant temperature. The electrothermal phase-change material is a phase-change material which can generate heat after being electrified and has phase change after the temperature reaches a specific value. The process of changing physical properties is called a phase change process, and in this case, the phase change material absorbs or releases a large amount of latent heat.

Referring to fig. 1 and 2, according to an aspect of the present invention, there is provided a blade for a wind power generator, which may include a blade shell 100 and first and second heating devices 200 and 300 disposed on the blade shell 100, the first and second heating devices 200 and 300 being capable of performing a heating operation individually so that the first and second heating devices 200 and 300 may be independently controlled, respectively, and the first and second heating devices 200 and 300 may be spaced apart in a circumferential direction of an airfoil of the blade shell 100 to individually heat a certain portion of the blade as needed.

Because first heating device 200 and second heating device 300 can work independently each other to can only be to the local heating of the blade casing that has frozen or the temperature subcooling, than the heating device of the whole setting of the blade casing among the prior art, the technical scheme of the utility model is more energy-conserving, thereby reduced the maintenance cost. The chordwise direction of the blade shell defined by the utility model can be the width direction of the blade shell, such as the up-down direction in fig. 1; the utility model discloses the axial direction of the blade casing of injecing can be the length direction of blade casing, control the direction as in figure 1.

In the case of a high ambient temperature, i.e. in the case of no icing on the surface of the blade shell, the first heating device 200 and the second heating device 300 do not need to be energized. In the case of a low ambient temperature, the temperature of the surface of the blade shell is too low to affect the aerodynamic performance of the blade, for example, but not limited to, when the blade shell is frozen and the wind speed is triggered to be not matched with the power, one or some local areas prone to freezing may be selected to be heated, so as to prevent the temperature of the surface of the blade shell from being too low. In localized areas that are more prone to icing, the heating device or devices may be selectively made conductive to heat those areas.

Further, the interval between the first heating device 200 and the second heating device 300 may be 1-10cm, and more preferably, the interval may be 2-5cm, but not limited thereto, and may be selected according to actual needs, if the interval is too small, the insulation performance between the first heating device 200 and the second heating device 300 may be affected, and if the interval is too large, ice at the interval may not melt during operation, and the deicing efficiency is affected.

In order to prevent the formation of a passage between the adjacent first and second heating devices 200 and 300, an insulation structure may be provided between the first and second heating devices 200 and 300, for example, but not limited to, in the wind turbine blade forming process, the second heating device 300 may be laid in a mold, then the insulation structure may be laid on the second heating device 300, and then the first heating device 200 may be laid on the insulation structure, so that the first and second heating devices 200 and 300 may be completely separated. More specifically, the insulating structure may be composed of at least one layer of insulating cloth material, but not limited thereto. It is understood that the first heating device 200 and the second heating device 300 may be disposed in an overlapping manner or in a non-overlapping manner in the thickness direction of the blade shell 100, and all are within the scope of the present invention.

It is understood that the first heating device 200 and the second heating device 300 may be composed of the same material, or both may be composed of different materials, respectively, all within the scope of the present invention, and preferably, at least one of the first heating device 200 and the second heating device 300 may be composed of an electrothermal phase change material, for example, but not limited to, one of the first heating device 200 and the second heating device 300 may be composed of an electrothermal phase change material, and the other of the first heating device 200 and the second heating device 300 may be composed of a common electrothermal material.

The first heating device 200 is made of an electrothermal phase change material, and the second heating device 300 is made of a common electrothermal material. More specifically, the common electric heating material may be a carbon fiber material or a carbon-glass mixed material, for example, but not limited to, the second heating device 300 may be a carbon fiber cloth or a carbon-glass mixed cloth, or the second heating device 300 may also be a polymer electric heating film, all within the protection scope of the present invention.

The first heating device 200 may have a predetermined temperature range, when the portion of the blade shell 100 where the first heating device 200 is arranged is frozen, the first heating device 200 at the corresponding portion may be powered on to generate heat, so that the temperature of the portion may be increased to melt the ice at the portion, and after the first heating device 200 is continuously powered on, the temperature may be continuously increased until the predetermined temperature is reached, and the temperature will not be increased any more, so that the portion where the first heating device 200 is arranged may be prevented from being damaged due to the excessively high temperature. After the first heating device 200 is continuously powered on, the temperature will change within a predetermined range, the temperature of the predetermined range may be higher than the freezing point, so that the blade shell 100 surface may be prevented from being frozen, and the predetermined range may be set within a safe range to prevent the blade of the wind turbine from being damaged due to the excessively high temperature. More preferably, the operating temperature of the first heating device 200 may be 5 ℃ to 50 ℃, but not limited thereto, and the operating temperature range of the first heating device 200 may be adjusted according to actual needs.

If the other portion of the blade shell 100 provided with the second heating device 300 has a low temperature and even freezes ice, the second heating device 300 at the corresponding portion may be powered to heat the blade shell 100 at the corresponding portion, so as to clear the icing. When the ice at this location is removed, the second heating device 300 needs to be powered off in time to prevent damage to the blade shell 100 due to excessive temperature.

With continued reference to fig. 2, more preferably, a first heating device 200 may be disposed near the leading edge of the blade shell 100, and the first heating device 200 may extend to both sides by the same width from the mold-clamping seam of the leading edge of the blade shell 100 in the circumferential direction of the airfoil of the blade shell 100. The front edge of the blade shell 100 is easy to freeze, the first heating device 200 is arranged on the front edge of the blade shell 100, so that the front edge of the blade shell 100 can be continuously heated to prevent freezing, the blade shell 100 cannot be damaged, the second heating device 300 can be arranged at other positions, so that when a certain or certain positions are frozen, the power is turned on to deice, and when the ambient temperature is higher, the second heating device 300 can be in a power-off state, so that the energy can be saved, and the cost can be reduced.

More preferably, the width of the first heating device 200 along the circumferential direction of the airfoil of the blade shell 100 may be 100 mm and 500mm, and further, the width of the first heating device 200 along the leading edge of the blade shell 100 may be 200mm, which may be selected according to actual needs. In the forming process, in order to facilitate the laying, the first heating device 200 is not small enough in size, the small size increases the workload of the laying process, and the large size makes it difficult to control the laying smoothly.

More specifically, the first heating device 200 may be electrically connected to the blade root heating control cabinet 600 through two shielding power lines 700 to form an electrical circuit, wherein the shielding layers of the shielding power lines 700 may be connected in a plurality of equipotential positions. It is understood that the second heating device 300 may also be electrically connected to the blade root heating control cabinet 600 through two shielded power lines 700 to form an electrical circuit, wherein the shielding layers of the shielded power lines 700 may be connected in a plurality of equipotential positions.

Referring to fig. 2, according to an embodiment of the present invention, the wind turbine blade may further include a lightning shielding layer 400, the lightning shielding layer 400 may cover the first heating device 200 and the second heating device 300, and it is understood that the first heating device 200 and the second heating device 300 may be disposed inside an arc structure surrounded by the lightning shielding layer 400. Further, both ends of the lightning shield layer 400 may be grounded, respectively, in the axial direction of the wind turbine blade. More specifically, both ends of the lightning shielding layer 400 may be respectively provided with lightning receptors, through which the lightning shielding layer 400 may be connected with a main lightning conductor, which may be connected to the ground. More preferably, the lightning receptor may pass through the core material and the skin to the inner surface of the blade shell 100 during layup and be exposed for a predetermined length, which may be at least 2 cm.

When a lightning strike occurs, lightning current may be conducted to the ground through the lightning shielding layer 400, so that the blade may be protected from damage. According to an exemplary embodiment of the present invention, the lightning shielding layer 400 may be formed of a metal material, and more particularly, may be a mesh-type structure formed of a copper material or a mesh-type structure formed of an aluminum material.

With continued reference to fig. 2, according to an embodiment of the present invention, the wind turbine blade may further include an insulating layer 500 and a protective layer, the insulating layer 500 may be disposed between the lightning shielding layer 400 and the first heating device 200 and the second heating device 300, and the protective layer may cover the lightning shielding layer 400.

Further, in the process of forming the blade shell 100, a protective layer may be first laid in a mold, then the lightning shielding layer 400 is disposed on the protective layer, and at least one insulating layer 500, for example, but not limited to, 1 layer or 2 layers, may be laid on the surface of the lightning shielding layer 400, and the area where the insulating layer 500 is located may completely cover the area where the lightning shielding layer 400 is located. More specifically, the protective layer may be formed of a 3-5 layer surface felt 800, and the area of the surface felt 800 may be slightly larger than that of the lightning shielding layer 400, so as to prevent damage to the lightning shielding layer 400 in a cutting and grinding process after the blade shell 100 is demolded, and also to protect the lightning shielding layer 400. The area of the lightning shield layer 400 may be flush with the parting plane of the mold in the circumferential direction of the airfoil shape of the blade shell 100.

Further, the first heating device 200 may be laid on the surface of the insulation layer 500, the first heating device 200 may be arranged on the entire area of the wind turbine blade in the axial direction up to the edge of the blade shell 100, and the first heating device 200 may be arranged close to the leading edge of the blade shell 100 in the chordwise direction.

Further, after the first heating device 200 is laid, at least one insulating layer 500 is further laid on the surface of the first heating device 200, the insulating layer 500 may completely cover the first heating device 200, and the insulating layer 500 between the first heating device 200 and the second heating device 300 may prevent the first heating device 200 and the second heating device 300 from forming a passage.

Further, a second heating device 300 may be laid on the surface of the insulation layer 500, and the second heating device 300 may extend to the blade edge in the axial direction. Further, other materials of the blade, such as a core material, a reinforcement inner skin, etc., may be sequentially laid on the surface of the second heating device 300.

According to an exemplary embodiment of the present invention, the first heating device 200 may extend from a position 10cm from the blade root to the edge of the blade shell 100 in the axial direction of the blade shell 100. The first heating apparatus 200 may include a plurality of or a single heating unit, and in the case where the first heating apparatus 200 includes a plurality of heating units, the plurality of heating units may be connected in series or in parallel with each other. In the case where a plurality of heating units are connected in series, the first heating apparatus 200 has a large heating power, which facilitates rapid deicing in a short time. In the case where a plurality of heating units are connected in parallel, the first heating means 200 formed therefrom has a large power density. Based on the same principle, the second heating device 300 may also include a plurality of heating units or a single heating unit, and in the case of a plurality of heating units, the plurality of heating units may be connected in series or in parallel with each other, which is not described in detail.

According to an embodiment of the present invention, the first heating device 200 may include a first heating unit and a second heating unit which are disposed at an interval in a thickness direction of the blade housing 100, and the first heating unit and the second heating unit may be capable of performing a heating operation alone. When the ambient temperature is in the first temperature range, the temperature of the blade shell 100 is low, which affects the normal operation of the blade, and the first heating unit or the second heating unit of the first heating device 200 may be turned on, so that the blade shell 100 operates normally. Once the ambient temperature is lower than the first temperature, the blade shell 100 will freeze in the temperature range, which seriously affects the normal operation of the blade, and at this time, the first heating unit and the second heating unit need to be turned on simultaneously, so that the deicing can be realized. With the structure, certain heating units can be selected to be started according to actual needs, so that energy conservation can be realized.

According to a specific embodiment of the present invention, the second heating device 300 may also include a third heating unit and a fourth heating unit disposed along the thickness direction of the blade shell 100, and the third heating unit and the fourth heating unit can perform heating operation alone, and the operation principle thereof is the same as that of the first heating device 200, and therefore is not repeated.

According to another aspect of the present invention, there is provided a wind turbine blade, which may include a blade shell 100 and a first heating device 200 and a second heating device 300 disposed on the blade shell 100, wherein the first heating device 200 and the second heating device 300 are at least partially overlapped along a circumferential direction of a wing of the blade shell 100, and the first heating device 200 and the second heating device 300 are insulated from each other, the first heating device 200 and the second heating device 300 may be independently heated, and a certain or some first heating device 200 and second heating device 300 may be selectively opened according to a region to be heated, a power requirement for heating, and other conditions, so as to save energy and satisfy a heating requirement.

According to another embodiment of the present invention, the wind turbine blade may further include a temperature sensor and a controller, the controller may be electrically connected to the temperature sensor and the first heating device 200, when the ambient temperature is too low, the front edge of the blade shell 100 is frozen, the temperature sensor located at the front edge of the blade shell 100 sends the temperature signal of the location to the controller, and the controller will power on the first heating device 200 to heat the front edge of the blade shell 100 for deicing. Similarly, the controller may be further electrically connected to the temperature sensor and the second heating device 300, when the local temperature of the blade shell 100 provided with the second heating device 300 is too low, the temperature sensor at the corresponding portion sends the temperature signal of the portion to the controller, the controller may start the second heating device 300 to heat the blade shell 100 by raising the temperature, and when the temperature of the blade shell 100 reaches the predetermined value, the controller may power off the second heating device 300, so as to stop heating the second heating device 300, and prevent the blade shell 100 from being damaged due to too high temperature. According to the circulation, the automatic deicing of the blades of the wind driven generator can be realized through control components such as a temperature sensor and a controller.

More specifically, the temperature sensor may be a plurality of temperature sensors, and a plurality of temperature sensors may be uniformly arranged on the blade shell 100, or of course, may be non-uniformly arranged according to actual needs, all being within the protection scope of the present invention.

In use, the leading edge of the blade shell 100 may be de-iced by first activating the first heating device 200 of the leading edge of the blade shell 100 to heat the leading edge of the blade shell 100, in the process, melted water may flow along the circumferential direction of the airfoil of the blade shell 100, thereby causing secondary icing, for example, but not limited to, the secondary icing position occurs at the position where the second heating device 300 is arranged, the temperature sensor at the corresponding position also sends a temperature signal to the controller to activate the second heating device 300 at the corresponding position to remove ice, and then the second heating device 300 may be de-energized, thereby achieving energy saving control. More specifically, the second heating device 300 may be powered on intermittently, for example, but not limited to, it may be powered off for 0.5 hour after every 1-2 hours of power on.

The utility model provides a aerogenerator blade can arrange the first heating device 200 that comprises electric heat phase change material at the leading edge of blade casing 100, and this first heating device 200 can work at predetermined temperature within range, and the high temperature can not appear and cause the phenomenon of damage to blade casing 100 to the security of blade casing 100 has been improved.

The described features, structures, or characteristics of the invention may be combined in any suitable manner in one or more embodiments. In the description above, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

Claims (12)

1. A wind turbine blade, characterized in that the wind turbine blade comprises a blade shell (100) and a first heating device (200) and a second heating device (300) arranged on the blade shell (100), the first heating device (200) and the second heating device (300) are arranged along the circumference of the airfoil of the blade shell (100) at intervals, and the first heating device (200) and the second heating device (300) can be independently heated.

2. Wind turbine blade according to claim 1, wherein at least one of the first heating device (200) and the second heating device (300) is formed of an electrothermal phase change material.

3. Aerogenerator blade according to claim 1, characterized in that the spacing between the adjacent first heating device (200) and the second heating device (300) is 2-5cm and/or the width of the first heating device (200) and the second heating device (300) in the circumferential direction of the airfoil of the blade shell (100) is 100-500 mm.

4. The wind turbine blade according to claim 1, wherein the first heating device (200) is provided on a leading edge of the blade shell (100), the first heating device (200) is formed of an electrothermal phase change material, and the first heating device (200) extends from a mold clamping seam of the leading edge of the blade shell (100) to both sides in a chordwise direction of the blade shell (100) by the same width.

5. Wind turbine blade according to claim 1, wherein said first heating means (200) and said second heating means (300) are electrically connected to the blade root heating control cabinet (600) by two shielded power lines (700), respectively, and wherein a plurality of shielding layers of said shielded power lines (700) are connected in an equipotential manner.

6. Wind turbine blade according to any of claims 1 to 5, wherein said wind turbine blade further comprises a lightning shielding layer (400), said lightning shielding layer (400) covering said first heating means (200) and said second heating means (300).

7. Wind turbine blade according to claim 6, wherein the lightning shield (400) is grounded at both ends in the axial direction of the blade shell, respectively.

8. Wind turbine blade according to claim 7, wherein the wind turbine blade further comprises an insulating layer (500) and a protective layer, the insulating layer (500) being arranged between the lightning shielding layer (400) and the first heating means (200) and the insulating layer (500) being arranged between the lightning shielding layer (400) and the second heating means (300), the protective layer covering the lightning shielding layer (400).

9. Wind turbine blade according to claim 8, wherein said first heating means (200) comprise a plurality of or a single heating unit, said plurality of heating units being connected in series or in parallel with each other; and/or

The second heating device (300) comprises a plurality of or a single heating unit, and the plurality of heating units are connected in series or in parallel with each other.

10. Wind turbine blade according to any of claims 1 to 5, wherein the first heating means (200) comprises a first and a second heating unit arranged at intervals in the thickness direction of the blade shell (100) and which are individually operable for heating; and/or the second heating device (300) comprises a third heating unit and a fourth heating unit which are arranged at intervals along the thickness direction of the blade shell (100), and the third heating unit and the fourth heating unit can independently perform heating operation.

11. A wind turbine blade, characterized in that the wind turbine blade comprises a blade shell (100) and a first heating device (200) and a second heating device (300) arranged on the blade shell (100), the first heating device (200) and the second heating device (300) are at least partially overlapped along the circumferential direction of the airfoil of the blade shell (100), and the first heating device (200) and the second heating device (300) are insulated from each other, and the first heating device (200) and the second heating device (300) can be independently heated.

12. A wind park according to any of claims 1-11, wherein the wind park comprises a wind generator blade.

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