Blade heating and conducting prefabricated part, blade and wind generating set

Abstract

The utility model relates to a blade heating and conducting prefabricated part, a blade and a wind generating set, the blade is provided with a blade root and a blade tip, the blade comprises a shell, a heating prefabricated part and a conducting prefabricated part, the shell is provided with an inner cavity, and the shell comprises an inner surface facing the inner cavity and an outer surface deviating from the inner cavity; the heating prefabricated part is laid on at least one of the inner surface and the outer surface and connected with the shell, and the first protection part covers the heating part on the shell; the conductive prefabricated part is arranged on the shell, the conductive part is provided with a first wiring end and a second wiring end, the first wiring end is electrically connected with the heating part, and the second wiring end is configured to be connected with a power source so as to guide current to the heating part and heat the shell. The embodiment of the utility model provides a blade heating and conducting prefabricated part, a blade and a wind generating set, which can simplify the forming process of the blade and improve the reliability of the combination of a heating material and an original blade structure.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a blade heating and conductive prefabricated part, a blade, and a wind power generator set. Background Art

[0002] In freezing rain and extremely low temperature areas, when ice forms on the surface of wind turbine blades, it will change the aerodynamic shape, reduce aerodynamic efficiency, and cause power generation loss. Therefore, it is often necessary to heat the blades to achieve the purpose of de-icing.

[0003] In the prior art, heating materials are placed on the surface of the blade. This process is generally added during the production of the blade, and the heating materials are integrated into the shell of the blade. However, for in-service blades, when setting heating materials on the surface, it is necessary to consider the reliable combination of the heating materials and the original blade structure. Generally, resin hand lay-up or vacuum suction injection is used. When the hand lay-up solution is adopted, because the flatness of the surface cannot be guaranteed, the aerodynamic shape will be uneven, resulting in power generation loss. Therefore, the conventional method in the industry is to use the vacuum suction injection method. This method requires the placement of materials on the surface of the blade, the vacuum suction injection system, the infusion, the heating curing, the outer surface paint repair and other processes. All of the above operations need to be completed on site, the operation time is long, and there are different operating difficulties in each stage, which is prone to manufacturing defects. The laying of the blade surface material needs to ensure the flatness of each layer to prevent the surface from being uneven. The vacuum suction injection system requires operations such as making rubber strips and vacuum bags on site. And during the curing period (at least 3 hours), the vacuum system cannot leak, otherwise it will affect the infusion effect. Based on the above operational difficulties, if the operation is carried out at high altitude, the operation hours and difficulty will be further increased. The increase in operation hours causes an increase in downtime, which also seriously affects the power generation of the unit. Summary of the invention

[0004] The embodiments of the present invention provide a blade heating and conductive preform, a blade, and a wind turbine generator set, which can simplify the blade molding process and improve the reliability of the combination of the heating material and the original blade structure.

[0005] On the one hand, according to an embodiment of the present invention, a wind turbine blade heating preform is proposed, including a heating part and a first protective part, the first protective part is stacked with the heating part and covers the heating part, the heating preform is connected to the blade through the heating part, and the heating part is configured to provide heat to the blade.

[0006] According to one aspect of the embodiments of the present invention, the heating preform further includes a first connecting portion, which is stacked and arranged on a side of the heating portion away from the first protecting portion.

[0007] According to one aspect of the embodiments of the present invention, the first protection part and the first connection part include glass cloth, and the heating part includes carbon fiber resistance wire.

[0008] According to one aspect of the embodiments of the present invention, the first protection portion includes a first layer and a second layer which are stacked, and the first layer is located between the second layer and the heating portion.

[0009] On the other hand, according to an embodiment of the present invention, a conductive preform of a wind turbine blade is provided, comprising a conductive portion and a second protective portion, wherein the second protective portion is stacked with the conductive portion and covers the conductive portion, and the conductive portion is configured to transmit current.

[0010] According to one aspect of the embodiments of the present invention, the conductive preform further includes a second connecting portion, and the second connecting portion is stacked and arranged on a side of the conductive portion away from the second protecting portion.

[0011] According to one aspect of the embodiments of the present invention, the second protection portion and the second connection portion include glass cloth, and the conductive portion includes a wire.

[0012] On the other hand, according to an embodiment of the present invention, a blade is proposed, having a blade root and a blade tip, the blade comprising a shell, a heating preform as described above, and a conductive preform, the shell having an inner cavity, the shell comprising an inner surface facing the inner cavity and an outer surface facing away from the inner cavity; the heating preform is laid on at least one of the inner surface and the outer surface and connected to the shell, and a first protective part covers the heating part on the shell; the conductive preform is arranged on the shell, the conductive part has a first terminal and a second terminal, the first terminal is electrically connected to the heating part, and the second terminal is configured to be connected to a power source to guide current to the heating part and heat the shell.

[0013] According to one aspect of the embodiments of the present invention, the heating preform and / or the conductive preform is adhesively connected to at least one of the inner surface and the outer surface.

[0014] According to one aspect of an embodiment of the present invention, the blade includes a plurality of conductive preforms, the plurality of conductive preforms include a first conductive preform and a second conductive preform connected to each other, the first conductive preform is located between the second conductive preform and the heating preform, the first conductive preform is connected to the heating part and the second conductive preform is configured to be connected to a power source.

[0015] According to one aspect of the embodiment of the present invention, the shell comprises a front edge and a rear edge which are arranged opposite to each other, and the thickness of the heated preform decreases in the direction from the front edge to the rear edge.

[0016] According to one aspect of an embodiment of the present invention, the heating preform further comprises a first connecting portion, which is stacked on a side of the heating portion away from the first protective portion, the first protective portion covers and exceeds the heating portion, and the heating portion covers and exceeds the first connecting portion.

[0017] According to one aspect of the embodiment of the present invention, the first protection part includes a first layer and a second layer which are stacked, the first layer is located between the second layer and the heating part, the first layer covers and exceeds the heating part, and the second layer covers and exceeds the first layer.

[0018] According to one aspect of the embodiments of the present invention, the heating preform and the surface profile of the shell have the same extension direction.

[0019] According to one aspect of the embodiments of the present invention, a side of the first protection portion facing away from the housing is coated with paint.

[0020] According to one aspect of the embodiments of the present invention, the blade includes a lightning protection prefabricated component, the lightning protection prefabricated component is bonded to the blade tip, the lightning protection prefabricated component includes a lightning receptor, and the lightning receptor is connected to the down conductor.

[0021] According to one aspect of the embodiment of the present invention, the blade includes a plurality of heating preforms, the plurality of heating preforms are laid on the shell at intervals, and the conductive preforms are respectively connected to the plurality of heating preforms.

[0022] In another aspect, a wind turbine generator set is provided according to an embodiment of the present invention, comprising the blade as described above.

[0023] The embodiment of the present invention provides a blade heating and conductive preform, a blade, and a wind turbine generator set. By laying the heating preform on the inner surface or outer surface of the shell of the blade, the shell and the heating preform are formed as two independent parts, thereby simplifying the blade molding process. It is only necessary to lay the formed heating preform directly on the shell for heating. On the basis of using the heat after heating to de-ice the shell, the reliability of the connection between the heating preform and the shell is improved, and the problem of unstable combination of the two due to complex processes is avoided, which has a better deicing effect. At the same time, laying the heating preform directly on the shell after prefabrication reduces the process difficulty, improves the preparation efficiency, is also conducive to completing the operation at high altitude, has better preparation flexibility, and thus reduces the downtime of the unit, reduces the impact on the power generation of the unit, and has better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0025] Figure 1 is a schematic structural diagram of a blade according to an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 Sectional view at NN in the middle;

[0027] Figure 3 yes Figure 2 A local enlarged schematic diagram of the middle A;

[0028] Figure 4 yes Figure 2 Another partial enlarged schematic diagram of point A in the middle;

[0029] Figure 5 is a schematic structural diagram of another blade according to an embodiment of the present invention;

[0030] Figure 6 is a schematic structural diagram of another blade according to an embodiment of the present invention;

[0031] Figure 7 It is a schematic structural diagram of another blade according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] 100-leaf blade; 101-leaf root; 102-leaf tip;

[0034] 10-shell; 11-front edge; 12-rear edge; 20-heating preform; 21-heating part; 22-first connecting part; 23-first protective part; 24-first layer; 25-second layer; 30-conductive preform; 31-first conductive preform; 32-second conductive preform; 50-lightning protection preform.

[0035] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0036] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least part of the known structures and technologies are not shown in order to avoid unnecessary ambiguity of the present invention; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0037] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the blade heating and conductive preform, blade, and wind turbine generator set of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0038] In order to better understand the present invention, Figures 1 to 7 The blade heating and conductive preform, blade, and wind turbine generator set according to the embodiments of the present invention are described in detail.

[0039] See also Figure 1 and Figure 2 According to an embodiment of the present invention, a blade 100 is proposed, which has a blade root 101 and a blade tip 102. The blade 100 includes a shell 10, a heating preform 20 and a conductive preform 30. The shell 10 has an inner cavity, and the shell 10 includes an inner surface facing the inner cavity and an outer surface facing away from the inner cavity; the heating preform 20 is laid on at least one of the inner surface and the outer surface and connected to the shell 10, and the first protective portion 23 covers the heating portion 21 on the shell 10; the heating preform 20 is configured to provide heat to the shell 10; the conductive preform 30 is arranged on the shell 10, and the conductive portion thereof has a first terminal and a second terminal, the first terminal is electrically connected to the heating preform 20, and the second terminal is configured to be connected to a power source to guide current to the heating portion 21 and heat the shell 10.

[0040] In this embodiment, the shell 10 and the heating preform 20 of the blade 100 are two independent structures and are molded separately. After the shell 10 is molded by the infusion process, the prefabricated heating preform 20 is laid on the surface of the shell 10 so that the two form a stable connection to obtain the final blade 100 structure. The shell 10 is heated by the heating capacity of the heating preform 20, thereby achieving a de-icing effect on the surface of the shell 10.

[0041] Among them, the shell 10 has a relative inner surface and an outer surface. After the prefabricated heating preform 20 is obtained, it can be laid on the inner surface or the outer surface. Usually, laying the heating preform 20 on the outer surface has a better deicing effect. This is because when the external temperature is low, ice will usually form on the outer surface of the shell 10. The heating preform 20 on the outer surface can directly heat the ice. When the heating preform 20 is laid on the inner surface, the heat generated still needs to be conducted by the shell 10, which will cause partial heat loss and is not conducive to heat conduction. Therefore, the deicing effect is not good.

[0042] Optionally, the heating preform 20 is usually heated electrically, and a conductive preform 30 needs to be arranged in the shell 10 to supply power to the heating preform 20. The present application does not specifically limit the specific position of the conductive preform 30 in the shell 10, and it is sufficient to ensure that the conductive preform 30 is electrically connected to the heating preform 20 to supply power to it.

[0043] The conductive preform 30 usually needs to be connected to the power supply inside the unit, and the first terminal of the conductive preform 30 is connected to the heating preform 20 and the second terminal is connected to the power supply, so that the current can be conducted from the power supply to the heating preform 20, and the conductive preform 30 plays the role of transmitting current.

[0044] Considering that the power source is usually located at the blade root 101, the conductive preform 30 can be arranged at a position of the shell 10 close to the blade root 101 to facilitate connection with the power source. The conductive preform 30 is usually arranged in the inner cavity of the shell 10 to form better isolation protection for the conductive preform 30. At the same time, considering the effect of airflow, the blade tip 102 of the shell 10 is more prone to ice formation than the blade root 101. Therefore, the heating preform 20 can be laid at a position close to the blade tip 102 to perform deicing more specifically.

[0045] Optionally, the position and area of ​​the heating preform 20 can be set according to different actual needs and flexibly selected according to the actual icing conditions. The present application does not impose any special restrictions on the laying position and area size of the heating preform 20.

[0046] The embodiment of the present invention provides a blade 100, which is formed by laying a heating preform 20 on the inner surface or outer surface of the shell 10 of the blade 100, so that the shell 10 and the heating preform 20 are two independent parts formed separately, thereby simplifying the molding process of the blade 100, and only needs to lay the formed heating preform 20 directly on the shell 10 for heating. On the basis of using the heat after heating to de-ice the shell 10, the reliability of the connection between the heating preform 20 and the shell 10 is improved, and the problem of unstable combination of the two due to complex process is avoided, and a better de-icing effect is achieved. At the same time, laying the heating preform 20 directly on the shell 10 after prefabrication reduces the process difficulty, improves the preparation efficiency, is also conducive to completing the operation at high altitude, has better preparation flexibility, and thus reduces the downtime of the unit, reduces the impact on the power generation of the unit, and has better economic benefits.

[0047] As an optional embodiment, the heating preform 20 and / or the conductive preform 30 are adhesively connected to at least one of the inner surface and the outer surface.

[0048] Optionally, after the shell 10 and the heating preform 20 are formed separately, the heating preform 20 can be bonded to the surface of the shell 10 using structural adhesive. This application takes bonding the heating preform 20 to the outer surface as an example for explanation.

[0049] Specifically, the structural adhesive may be first applied to the surface of the shell 10, and then the heating preform 20 may be bonded to the structural adhesive, and then it may be fixed to the surface of the shell 10 using tools such as a vacuum film or a binding strip to obtain the final blade 100 structure, so that the blade 100 has the performance of heating and deicing.

[0050] An embodiment of the present invention provides a blade 100, which simplifies the molding process of the blade 100 by laying the heating preform 20 on the surface of the shell 10 by bonding, facilitates the preparation of the blade 100, and improves the preparation efficiency. The bonding method has higher flexibility, so that a more reliable connection is formed between the heating preform 20 and the shell 10, thereby improving the de-icing effect on the surface of the blade 100.

[0051] As an alternative embodiment, see Figure 3 The heating preform 20 includes a heating portion 21 and a first connecting portion 22 . The first connecting portion 22 and the heating portion 21 are stacked. The heating preform 20 is bonded to the shell 10 through the first connecting portion 22 , and the first terminal is electrically connected to the heating portion 21 .

[0052] As for the structure of the heating preform 20, it can be specifically formed by stacking a heating part 21 and a first connecting part 22, wherein the part that performs electrical heating is the heating part 21, and the first terminal of the conductive preform 30 is specifically electrically connected to the heating part 21 of the heating preform 20, and the electric heating process is realized after current is provided to the heating part 21.

[0053] The first connection part 22 mainly serves to contact the surface of the shell 10. By using the first connection part 22 to contact the surface of the shell 10, it is convenient to connect the preform as a whole with the shell 10, and prevents the heating part 21 from directly contacting the surface of the shell 10 and causing damage. At the same time, the first connection part 22 can form a more reliable connection with the surface of the shell 10.

[0054] The embodiment of the present invention provides a blade 100 and a specific structural form of a heating preform 20 , so that the heating preform 20 is easy to shape and forms a more reliable connection with the shell 10 .

[0055] As an alternative embodiment, see Figure 3 The heating preform 20 further includes a first protection portion 23 , which is stacked on a side of the heating portion 21 away from the first connecting portion 22 , and the first protection portion 23 covers the heating portion 21 .

[0056] Optionally, a first protection portion 23 may be provided on the heating portion 21 , thereby forming a three-layer structure together with the heating portion 21 and the first connecting portion 22 . The first protection portion 23 covers the heating portion 21 to provide isolation and protection for the heating portion 21 .

[0057] An embodiment of the present invention provides a blade 100, which provides another specific structural form of a heating preform 20. By setting a first protective portion 23 on the heating portion 21, a covering protection is formed for the heating portion 21 to prevent the heating portion 21 from being exposed to the external environment, thereby avoiding heat loss and preventing structural wear.

[0058] As an optional embodiment, the first connecting portion 22 and the first protecting portion 23 include glass cloth, and the heating portion 21 includes carbon fiber resistance wire.

[0059] Considering that glass cloth is more in line with the material of the shell 10, in this embodiment, the first connecting part 22 and the first protective part 23 can be set to glass cloth material, so that the heating preform 20 and the shell 10 form a more stable connection. At the same time, the heating part 21 adopts carbon fiber resistance wire, which has better electric heating efficiency. Of course, heating materials such as graphene can also be used. This application does not specifically limit the specific materials of the first connecting part 22, the first protective part 23 and the heating part 21, and can be selected according to different actual needs.

[0060] The embodiment of the present invention provides a blade 100, which provides specific materials for each layer of the heating preform 20, so that the material of the heating preform 20 is more closely matched to the material of the shell 10, forming a reliable connection, while having higher heating efficiency and improving the de-icing ability of the shell 10 surface.

[0061] As an alternative embodiment, see Figure 4 The first protection portion 23 includes a first layer 24 and a second layer 25 which are stacked, and the first layer 24 is located between the second layer 25 and the heating portion 21 .

[0062] Optionally, the first protective part 23 can be set to a double-layer stacked structure of a first layer 24 and a second layer 25, with the first layer 24 forming direct contact and coverage with the heating part 21, and the second layer 25 directly covering the first layer 24, thereby achieving double isolation protection for the heating part 21.

[0063] In this embodiment, the first protection part 23 is described by taking a double-layer structure as an example, which is not limited to a stacked structure of a first layer 24 and a second layer 25 and can be adjusted according to actual needs. The present application does not specifically limit the specific structure of the first protection part 23.

[0064] An embodiment of the present invention provides a blade 100, which forms a double-layer isolation protection for the heating part 21 by setting the first protective part 23 to a stacked structure of a first layer 24 and a second layer 25. At the same time, the heating part 21 can better transfer heat to the shell 10, reduce heat loss, and have a better de-icing effect.

[0065] As an optional embodiment, the conductive preform 30 is bonded to the housing 10 .

[0066] Optionally, like the heating preform 20 , the conductive preform 30 may be bonded to the surface of the housing 10 to achieve connection between the conductive preform 30 and the housing 10 , so that the connection of the conductive preform 30 has better stability.

[0067] The conductive preform 30 can usually be bonded to the inner surface of the housing 10, thereby isolating and protecting the conductive preform 30, and facilitating the connection between the conductive preform 30 and the power supply in the inner cavity.

[0068] The embodiment of the present invention provides a blade 100 , which facilitates the assembly of the conductive preform 30 by bonding the conductive preform 30 to the shell 10 , simplifies the process flow, reduces the process difficulty, and forms a more stable current conduction for the heating preform 20 .

[0069] As an optional embodiment, the conductive preform 30 includes a conductive part and a second connecting part, the second connecting part and the conductive part are stacked, the conductive preform 30 is bonded to the shell 10 through the second connecting part, and the conductive part has a first connecting end and a second connecting end.

[0070] Optionally, the conductive preform 30 can also be set as a preform structure. The specific structure is that the conductive part is stacked on the second connecting part. After the preform is formed separately, the second connecting part is used to form a bond with the shell 10. Since the preform structure of the conductive preform 30 is similar to the structure of the above-mentioned heating preform 20, the specific structure of the conductive preform 30 can be referred to by analogy. Figure 3 , which is not repeated in the figure.

[0071] Specifically, the conductive part has the function of conducting current, the first terminal and the second terminal are specifically on the conductive part, and the conductive part is connected between the power source and the heating preform 20 to conduct current.

[0072] An embodiment of the present invention provides a blade 100, which further simplifies the molding process of the shell 10 by setting the conductive preform 30 as a preform structure, and facilitates the connection between the conductive preform 30 and the heating preform 20 by bonding. The connection between the two has better stability, and the reliability of the structure is further improved.

[0073] As an optional embodiment, the conductive preform 30 further includes a second protective portion, which is stacked on a side of the conductive portion away from the second connecting portion, and covers the conductive portion.

[0074] Similarly, a second protection portion may be provided on the conductive portion, thereby forming a three-layer structure together with the conductive portion and the second connecting portion. The second protection portion covers the conductive portion to provide isolation protection for the conductive portion.

[0075] The embodiment of the present invention provides a blade 100 and a specific structural form of a conductive preform 30. By arranging a second protective portion on the conductive portion, the conductive portion is covered and protected to prevent the conductive portion from being exposed to the external environment and prevent structural wear.

[0076] As an optional embodiment, the second connecting portion and the second protecting portion include glass cloth, and the conductive portion includes a wire.

[0077] Also considering that glass cloth is more in line with the material of the shell 10, the second connecting part and the second protective part can be set to glass cloth material in this embodiment, so that the prefabricated conductive preform 30 forms a more stable connection with the shell 10. At the same time, the conductive part adopts a wire. When the conductive preform 30 is bonded to the inner surface of the shell 10, there is no need to consider the flatness of the surface. The conductive part can adopt a round wire to facilitate the conduction of current to the heating preform 20. The present application does not make any special restrictions on the specific structural materials of the second connecting part, the second protective part and the conductive part, and can be selected according to different actual needs.

[0078] The embodiment of the present invention provides a blade 100, which provides specific materials for each layer of the prefabricated conductive preform 30, so that the material of the conductive preform 30 is more closely matched to the material of the shell 10, forming a reliable connection, and further improving the reliability of the structure.

[0079] As an alternative embodiment, see Figure 5 The blade 100 includes a plurality of conductive preforms 30, the plurality of conductive preforms 30 include a first conductive preform 31 and a second conductive preform 32 connected to each other, the first conductive preform 31 is disposed in the shell 10 and located between the heating preform 20 and the second conductive preform 32, one end of the first conductive preform 31 is connected to the first terminal and the other end is connected to the heating preform 20.

[0080] Considering that when the distance between the second conductive preform 32 and the heating preform 20 is large, a direct connection cannot be achieved between the two, in order to form a stable connection between the two, a first conductive preform 31 can be arranged between the two to form a transition, thereby ensuring that the current can continue to be conducted to the heating preform 20 through the first conductive preform 31.

[0081] Optionally, since the second conductive preform 32 is usually arranged at the blade root 101 and the heating preform 20 is usually arranged at the blade tip 102, in order to achieve the transition between the two, the first conductive preform 31 can be arranged at the blade center position of the shell 10, and the specific position can be determined according to actual needs.

[0082] The first conductive preform 31 and the second conductive preform 32 have the same function of transmitting current. Different numbers of first conductive preforms 31 can be arranged according to the distance between the second conductive preform 32 and the heating preform 20 to realize current transfer and ensure that the current at the power supply can be stably transmitted to the heating preform 20.

[0083] An embodiment of the present invention provides a blade 100, which realizes the connection between the second conductive preform 32 and the heating preform 20 by arranging the first conductive preform 31 on the shell 10, thereby overcoming the problem of being unable to directly connect the two due to the large distance between them, making the conduction of current more stable, and providing reliable guarantee for sustainable deicing capability.

[0084] As an optional embodiment, the first conductive preform 31 is bonded to the housing 10 .

[0085] Optionally, the first conductive preform 31 may also be connected to the housing 10 by bonding, which facilitates the assembly of the first conductive preform 31 and has better stability.

[0086] Optionally, the first conductive preform 31 can be bonded to the inner surface or the outer surface of the housing 10 according to different requirements, as long as it can form a connection with the second conductive preform 32 and the heating preform 20 .

[0087] The embodiment of the present invention provides a blade 100, which is connected to the shell 10 by bonding, thereby simplifying the process flow, facilitating reliable connection between the two, and having better structural stability.

[0088] As an optional embodiment, the first conductive preform 31 can also be set as a preform structure. The specific structure is also to stack the conductive part on the second connecting part. After obtaining a separately formed preform, the second connecting part is used to form a bond with the shell 10. Since the preform structure of the first conductive preform 31 is similar to the structure of the above-mentioned heating preform 20, the specific structure of the first conductive preform 31 can be referred to by analogy. Figure 3 , which is not repeated in the figure.

[0089] Specifically, the conductive part has the function of conducting current, the first terminal is specifically connected to the conductive part, and the conductive part of the first conductive preform 31 is connected between the second conductive preform 32 and the heating preform 20 to conduct current.

[0090] An embodiment of the present invention provides a blade 100, which further simplifies the molding process of the shell 10 by setting the first conductive preform 31 as a preform structure, and facilitates the connection between the first conductive preform 31 and the heating preform 20 by bonding, so that the connection between the second conductive preform 32 and the heating preform 20 has better stability, further improving the reliability of the structure.

[0091] As an alternative embodiment, see Figure 3 and Figure 4 The shell 10 includes a front edge 11 and a rear edge 12 that are arranged opposite to each other. In the direction from the front edge 11 to the rear edge 12, the thickness of the heated preform 20 shows a decreasing trend.

[0092] An embodiment of the present invention provides a blade 100, which adjusts the thickness of the heated preform 20 so that the thickness of the heated preform 20 gradually decreases in the direction from the leading edge 11 to the trailing edge 12, thereby better conforming to the shape of the shell 10, fitting to the contour shape of the shell 10, and achieving a more reliable connection with the shell 10.

[0093] As an alternative embodiment, see Figure 3 The heating preform 20 also includes a first connecting portion 22, which is stacked on a side of the heating portion 21 away from the first protective portion 23, the first protective portion 23 covers and exceeds the heating portion 21, and the heating portion 21 covers and exceeds the first connecting portion 22.

[0094] In the present embodiment, in the three-layer structure of the heated preform 20, the size of each layer is adjusted to form a difference in coverage, thereby obtaining a stepped height difference structure, achieving a gradual thinning from the leading edge 11 to the trailing edge 12, and meeting the requirement of fitting with the outer contour of the shell 10.

[0095] Specifically, the first protective portion 23 is used to cover the heating portion 21, so that the coverage range of the first protective portion 23 exceeds the coverage range of the heating portion 21, and then the heating portion 21 covers the first connecting portion 22, so that the coverage range of the heating portion 21 exceeds the coverage range of the first connecting portion 22, so that the thickness of the heated preform 20 at the leading edge 11 is larger and the thickness gradually decreases when extending to the trailing edge 12.

[0096] An embodiment of the present invention provides a blade 100, which has a differentiated design for the coverage of the three-layer structure of the heating preform 20, so that the thickness of the heating preform 20 at the leading edge 11 and the trailing edge 12 tends to be thinner. On the basis of making the heating preform 20 have better connection performance and protection performance, it conforms to the outer contour of the shell 10 to form a more stable fitting connection.

[0097] As an alternative embodiment, see Figure 4 The first protection part 23 includes a first layer 24 and a second layer 25 which are stacked, the first layer 24 is located between the second layer 25 and the heating part 21 , the first layer 24 covers and exceeds the heating part 21 , and the second layer 25 covers and exceeds the first layer 24 .

[0098] In the present embodiment, in the other three-layer structure of the heated preform 20, the size of each layer is adjusted to form a difference in coverage, thereby obtaining a stepped height difference structure, achieving a gradual thinning from the leading edge 11 to the trailing edge 12, and meeting the requirement of fitting with the outer contour of the shell 10.

[0099] Specifically, the double-layer structure of the first protective portion 23 is used to cover the heating portion 21, so that the coverage range of the second layer 25 in the first protective portion 23 exceeds the coverage range of the first layer 24, and then the first layer 24 is directly contacted and covered on the heating portion 21, so that the coverage range of the first layer 24 exceeds the coverage range of the heating portion 21, so that the thickness of the heating preform 20 at the leading edge 11 is relatively large and the thickness gradually decreases when extending to the trailing edge 12.

[0100] An embodiment of the present invention provides a blade 100, which has a differentiated design for the coverage of the other three layers of the heating preform 20, so that the thickness of the heating preform 20 at the leading edge 11 and the trailing edge 12 tends to be thinner. On the basis of making the heating preform 20 have better protective performance, it conforms to the outer contour of the shell 10 to form a more stable fitting connection.

[0101] As an optional embodiment, the surface profiles of the heating preform 20 and the shell 10 have the same extension direction.

[0102] The embodiment of the present invention provides a blade 100, which makes the heating preform 20 fit and connect with the shell 10, so that the heating preform 20 can conform to the outer surface of the shell 10 and have the same contour as the shell 10 to form a more stable connection with better connection stability.

[0103] As an optional embodiment, a side of the first protective portion 23 facing away from the housing 10 is coated with paint.

[0104] An embodiment of the present invention provides a blade 100, which is formed by bonding a heated preform 20 to a shell 10 and then coating the shell 10 with paint. While providing protection for the shell 10, the surface of the shell 10 is made smoother, which is beneficial to the flow of airflow on the surface of the shell 10 and forms a more stable airflow driving force.

[0105] As an alternative embodiment, see Figure 6 The blade 100 includes a lightning protection prefabricated component 50, which is bonded to the blade tip 102. The lightning protection prefabricated component 50 includes a lightning receptor, which is connected to the down conductor.

[0106] Considering that the blade 100 is de-iced by electric heating in this embodiment, the shell 10 is provided with a conductive preform 30 and a heating preform 20 and other structures. Therefore, in order to prevent the above-mentioned components from being disturbed by lightning during the de-icing process, a lightning protection preform 50 is provided in this embodiment to conduct lightning.

[0107] Optionally, the lightning protection prefabricated component 50 can also adopt a prefabricated structure, and after being formed separately, it can be bonded to the shell 10, specifically at the blade tip 102 to better absorb lightning. The prefabricated component structure is convenient for subsequent assembly, further simplifying the process flow.

[0108] Among them, the lightning protection preform 50 mainly absorbs lightning through the lightning rod. Optionally, the lightning rod can adopt a lightning grid structure to absorb lightning over a larger area. The lightning rod is connected to the down conductor to conduct the lightning, thereby avoiding lightning interference with the conductive preform 30 and the heating preform 20 on the shell 10, affecting the heating and de-icing effect.

[0109] An embodiment of the present invention provides a blade 100, which has a lightning protection preform 50 bonded to the blade tip 102, thereby providing better lightning protection for the shell 10, preventing lightning from interfering with the electric heating process on the shell 10, and providing better lightning protection for the heating and deicing process. It has better safety performance and provides a guarantee for stable and sustainable deicing.

[0110] As an alternative embodiment, see Figure 7 The blade 100 includes a plurality of heating preforms 20 , which are laid on the shell 10 at intervals, and the conductive preforms 30 are connected to the plurality of heating preforms 20 , respectively.

[0111] Considering that different positions of the shell 10 need to be de-iced respectively, in this embodiment, a plurality of heating prefabricated parts 20 may be laid on the shell 10 to heat and de-ice the plurality of positions respectively.

[0112] The present application does not impose any special limitation on the number of the specific heating preforms 20 , which can be determined according to different actual deicing requirements.

[0113] The embodiment of the present invention provides a blade 100 , which can heat and de-ice different positions of the shell 10 at the same time by laying a plurality of heating prefabricated parts 20 on the shell 10 , thereby achieving a better de-icing effect.

[0114] As an optional embodiment, the conductive preform 30 is disposed at the blade root 101 , and the heating preform 20 is laid on a side of the conductive preform 30 close to the blade tip 102 .

[0115] Considering that the power supply is usually arranged at the blade root 101, in order to facilitate the connection of the conductive preform 30 to the power supply, the conductive preform 30 can be arranged at the blade root 101. Compared with the blade root 101, the blade tip 102 is more prone to ice formation. Therefore, the heating preform 20 can be laid at the blade tip 102, and finally the conductive preform 30 and the heating preform 20 are connected to realize the deicing process by electric heating.

[0116] The embodiment of the present invention provides a blade 100, which determines the positional relationship between the conductive preform 30 and the heating preform 20, so that the two are easier to connect, and the deicing process is completed more specifically, with a better deicing effect.

[0117] An embodiment of the present invention provides a wind turbine generator set, comprising the blade 100 as described above.

[0118] The embodiment of the present invention provides a blade heating and conductive preform, a blade, and a wind turbine generator set. By laying the heating preform on the inner surface or outer surface of the shell of the blade, the shell and the heating preform are formed as two independent parts, thereby simplifying the blade molding process. It is only necessary to lay the formed heating preform directly on the shell for heating. On the basis of using the heat after heating to de-ice the shell, the reliability of the connection between the heating preform and the shell is improved, and the problem of unstable combination of the two due to complex processes is avoided, which has a better deicing effect. At the same time, laying the heating preform directly on the shell after prefabrication reduces the process difficulty, improves the preparation efficiency, is also conducive to completing the operation at high altitude, has better preparation flexibility, and thus reduces the downtime of the unit, reduces the impact on the power generation of the unit, and has better economic benefits.

[0119] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wind turbine blade heating preform (20), characterized in that: The heating preform (20) comprises a heating portion (21) and a first protective portion (23), wherein the first protective portion (23) is stacked with the heating portion (21) and covers the heating portion (21), the heating preform (20) is connected to the blade (100) via the heating portion (21), and the heating portion (21) is configured to provide heat to the blade (100).

2. The heated preform (20) according to claim 1, characterized in that The heating preform (20) further comprises a first connecting portion (22), wherein the first connecting portion (22) is stacked and arranged on a side of the heating portion (21) facing away from the first protective portion (23).

3. The heated preform (20) according to claim 2, characterized in that The first protection part (23) and the first connection part (22) include glass cloth, and the heating part (21) includes carbon fiber resistance wire.

4. The heated preform (20) according to claim 1, characterized in that The first protection portion (23) comprises a first layer (24) and a second layer (25) which are stacked, and the first layer (24) is located between the second layer (25) and the heating portion (21).

5. A conductive preform (30) for a wind turbine blade, characterized in that: The conductive preform (30) comprises a conductive portion and a second protective portion, wherein the second protective portion is stacked with the conductive portion and covers the conductive portion, and the conductive portion is configured to transmit current.

6. The conductive preform (30) according to claim 5, characterized in that: The conductive preform (30) further comprises a second connecting portion, which is stacked and arranged on a side of the conductive portion away from the second protective portion.

7. The conductive preform (30) according to claim 6, characterized in that: The second protection part and the second connection part include glass cloth, and the conductive part includes a wire.

8. A blade (100) having a blade root (101) and a blade tip (102), characterized in that: include: A shell (10) having an inner cavity, the shell (10) comprising an inner surface facing the inner cavity and an outer surface facing away from the inner cavity; The heating preform (20) according to any one of claims 1 to 4, laid on at least one of the inner surface and the outer surface and connected to the shell (10), the first protective portion (23) covering the heating portion (21) on the shell (10); The conductive preform (30) according to any one of claims 5 to 7 is arranged on the shell (10), the conductive part having a first terminal and a second terminal, the first terminal being electrically connected to the heating part (21), and the second terminal being configured to be connected to a power source to guide current to the heating part (21) and heat the shell (10).

9. The blade (100) according to claim 8, characterized in that The heating preform (20) and / or the conductive preform (30) are adhesively connected to at least one of the inner surface and the outer surface.

10. The blade (100) according to claim 8, characterized in that The blade (100) comprises a plurality of the conductive preforms (30), wherein the plurality of the conductive preforms (30) comprise a first conductive preform (31) and a second conductive preform (32) connected to each other, wherein the first conductive preform (31) is located between the second conductive preform (32) and the heating preform (20), the first conductive preform (31) is connected to the heating portion (21), and the second conductive preform (32) is configured to be connected to the power source.

11. The blade (100) according to claim 8, characterized in that The shell (10) comprises a front edge (11) and a rear edge (12) which are arranged opposite to each other, and in a direction from the front edge (11) to the rear edge (12), the thickness of the heated preform (20) shows a decreasing trend.

12. The blade (100) according to claim 11, characterized in that The heating preform (20) further comprises a first connecting portion (22), wherein the first connecting portion (22) is stacked on a side of the heating portion (21) away from the first protective portion (23), the first protective portion (23) covers and is arranged beyond the heating portion (21), and the heating portion (21) covers and is arranged beyond the first connecting portion (22).

13. The blade (100) according to claim 11, characterized in that The first protective portion (23) comprises a first layer (24) and a second layer (25) which are stacked, wherein the first layer (24) is located between the second layer (25) and the heating portion (21), the first layer (24) covers and is arranged beyond the heating portion (21), and the second layer (25) covers and is arranged beyond the first layer (24).

14. The blade (100) according to claim 8, characterized in that The surface profiles of the heating preform (20) and the shell (10) have the same extension direction.

15. The blade (100) according to claim 8, characterized in that The side of the first protective portion (23) facing away from the housing (10) is coated with paint.

16. The blade (100) according to claim 8, characterized in that The blade (100) comprises a lightning protection prefabricated component (50), the lightning protection prefabricated component (50) is bonded to the blade tip (102), and the lightning protection prefabricated component (50) comprises a lightning receptor, which is connected to a down conductor.

17. The blade (100) according to claim 8, characterized in that The blade (100) comprises a plurality of the heating preforms (20), the plurality of the heating preforms (20) being laid on the shell (10) at intervals from each other, and the conductive preforms (30) being connected to the plurality of the heating preforms (20) respectively.

18. A wind turbine generator set, characterized in that: The invention comprises a blade (100) according to any one of claims 8 to 17.

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