Segmented Fan Blade Connection Structure, Segmented Fan Blade and Preparation Method

Abstract

The present invention discloses a segmented fan blade connection structure, a segmented fan blade and a preparation method. The connection structure includes: a first connecting piece, with the first end of the first connecting piece arranged at one end of the first blade segment, and the second end of the first connecting piece protruding from the end of the first blade segment; an insertion cavity is formed in the end of the second end of the first connecting piece; a second connecting piece, with the second end of the second connecting piece arranged at one end of the second blade segment, and the first end of the second connecting piece protruding from the end of the second blade segment; the first end of the second connecting piece is matched with the insertion cavity of the first connecting piece, and the first end of the second connecting piece is inserted into the insertion cavity to form a connection part, and fasteners are sequentially arranged along the chord direction and penetrate through the connection part to fixedly connect the first connecting piece and the second connecting piece. The present invention has the advantages of making the connection of the segmented blades more reliable, having a light additional mass at the segmented position, and being convenient for factory production and on-site operation in the wind farm.

Description

Technical Field

[0001] The present invention relates to the field of fan blade manufacturing, and particularly relates to a segmented fan blade connection structure, a segmented fan blade, and a preparation method thereof. Background Art

[0002] As a core component of a wind turbine, with the increase in the capacity of the unit, the size of the blade gradually increases. From the perspective of molding manufacturing, there are many technical bottlenecks in the production of large blades: on the one hand, the large-scale manufacturing of blades brings great difficulties. The increase in blade size leads to an increase in the load and stress at the blade root. Therefore, it is necessary to strengthen the structure during the blade production layup process. Due to the excessive size of the blade, the required fiberglass layup is too thick, and it is very difficult for the existing resin infusion process to thoroughly penetrate. The thicker the structural layup, the greater the infusion difficulty, and the greater the demand for factory space.

[0003] Therefore, there are great difficulties in the process of further manufacturing larger blades under the existing technology. On the other hand, the installation and transportation of large blades also face many problems. With the increase in blade size, the transportation and installation of blades also face many difficulties, such as restrictions from roads and transportation tools. Even if qualified blades can be produced and manufactured, transportation is difficult to achieve; in addition, the increase in blade size also poses a great challenge to the installation of blades in the wind farm. Large blades have poor resistance to extreme weather in the wind farm, and the aerodynamic loads suffered during extreme weather are relatively large, and the safety and reliability issues are also relatively serious. Therefore, with the development of large-capacity units, in order to produce large blades that match the units, it is an inevitable path for the development of blade technology to manufacture, transport, and install the blades in segments.

[0004] In the prior art, there are mainly three connection methods for segmented blades:

[0005] 1. Bonding: Fit the two segmented blades to be connected in the main beam area, and then bond them in the connection area.

[0006] 2. Bolt connection: Connect the two blades with bolts. Embed a bolt sleeve on one side of the blade, install the bolt, and then install a nut on the other side of the blade and tighten it.

[0007] 3. Insertion and fitting of a tube and a rod to connect the two segments of the segmented blade. A tubular structure is fixed in one segment of the segmented blade, and a rod-shaped structure is fixed in the other segment. The two segments are connected by inserting the rod-shaped structure into the tubular structure and pouring a viscous substance for fixation.

[0008] In the prior art, there are problems with the three connection methods of segmented blades. First, for the bonding solution, it is very difficult to achieve the required bonding strength, which easily causes connection failure. Second, for the bolt connection solution, the weight increase at the connection position is relatively large when using the bolt connection method, which affects the safety and economy of the blade, and the bolt pre-tightening force needs to be maintained frequently. Finally, for the solution of tube-rod fitting, it is difficult to make the round tube and the rod close tightly, which affects the pulling force of the structure, and the on-site pouring process is complex and the curing effect is not good.

[0009] It can be seen that the current segmented wind turbine blades have the following three problems, which make it difficult to achieve actual popularization and use of segmented wind turbine blades. First, the connection solution is complex, the reliability is poor, the cost is high, and it may reduce the aerodynamic efficiency, etc. Second, the additional mass introduced by the connection structure at the segmented part has an adverse impact on the root load of the blade and the corresponding pitch bearing, and the feasibility of the segmented solution is poor. Third, when operating the bolt fastening of the connection structure at the segmented part, the working space is small, the installation is difficult, and the later maintenance is difficult and the maintenance cost is high.

[0010] All of the above problems are important reasons restricting the actual use of the segmented technology. Therefore, it is necessary to provide a connection method for the segmented wind turbine blades, which can solve the above three problems. Summary of the Invention

[0011] The purpose of the present invention is to provide a connection structure for segmented wind turbine blades, a segmented wind turbine blade and a preparation method, so that the connection of the segmented blades is more reliable, the additional mass at the segmented position is light, and it is convenient for factory production and on-site operation in the wind farm.

[0012] In order to achieve the above purpose, the present invention is realized through the following technical solutions:

[0013] A connection structure for segmented wind turbine blades is used for connecting between adjacent first blade segments and second blade segments. The connection structure includes: a first connecting member, a first end of the first connecting member is arranged at one end of the first blade segment, and a second end of the first connecting member protrudes from one end of the first blade segment; an insertion cavity is formed at the end of the second end of the first connecting member. A second connecting member, a second end of the second connecting member is arranged at one end of the second blade segment, and a first end of the second connecting member protrudes from one end of the second blade segment. The first end of the second connecting member is matched with the insertion cavity of the first connecting member, and the first end of the second connecting member is inserted into the insertion cavity to form a connection part, and fasteners are arranged in a chordal direction in sequence and penetrate through the connection part to fixedly connect the first connecting member and the second connecting member.

[0014] Optionally, the first connecting member includes a first main connecting member and a first auxiliary connecting member having the same extending direction; the first main connecting member is coaxially arranged with the first main beam in the first blade segment, and the first auxiliary connecting member is coaxially arranged with the first auxiliary beam in the first blade segment; the second connecting member includes a second main connecting member and a second auxiliary connecting member having the same extending direction.

[0015] The second main connecting member is coaxially arranged with the second main beam in the second blade segment, and the second auxiliary connecting member is coaxially arranged with the second auxiliary beam in the second blade segment. The first main connecting member and the second main connecting member are oppositely arranged; a first socket cavity is provided at one end of the first main connecting member close to the second main connecting member, and one end of the second main connecting member is inserted into the first socket cavity. The first auxiliary connecting member and the second auxiliary connecting member are oppositely arranged, a second socket cavity is provided at one end of the first auxiliary connecting member close to the second auxiliary connecting member, and one end of the second auxiliary connecting member is inserted into the second socket cavity.

[0016] Optionally, the first main connector includes a first pressure surface main connector and a first suction surface main connector with the same extending direction. The first auxiliary connector includes a first pressure surface auxiliary connector and a first suction surface auxiliary connector with the same extending direction. The first pressure surface main connector and the first pressure surface auxiliary connector are arranged close to the pressure surface of the first blade segment. The first suction surface main connector and the first suction surface auxiliary connector are arranged close to the suction surface of the first blade segment. The first main beam in the first blade segment includes a first pressure surface main beam and a first suction surface main beam. The first auxiliary beam in the first blade segment includes a first pressure surface auxiliary beam and a first suction surface auxiliary beam. The first pressure surface main connector is coaxially connected to the first pressure surface main beam. The first suction surface main connector is coaxially connected to the first suction surface main beam. The first pressure surface auxiliary connector is coaxially connected to the first pressure surface auxiliary beam. The first suction surface auxiliary connector is coaxially connected to the first suction surface auxiliary beam. The second main connector includes a second pressure surface main connector and a second suction surface main connector with the same extending direction. The second auxiliary connector includes a second pressure surface auxiliary connector and a second suction surface auxiliary connector with the same extending direction. The second pressure surface main connector and the second pressure surface auxiliary connector are arranged close to the pressure surface of the second blade segment. The second suction surface main connector and the second suction surface auxiliary connector are arranged close to the suction surface of the second blade segment. The second main beam in the second blade segment includes a second pressure surface main beam and a second suction surface main beam. The second auxiliary beam in the second blade segment includes a second pressure surface auxiliary beam and a second suction surface auxiliary beam. The second pressure surface main connector is coaxially connected to the second pressure surface main beam; the second suction surface main connector is coaxially connected to the second suction surface main beam; the second pressure surface auxiliary connector is coaxially connected to the second pressure surface auxiliary beam; the second suction surface auxiliary connector is coaxially connected to the second suction surface auxiliary beam.

[0017] Optionally, the first connector includes a first connection section, a first fixed section, and a first transition section connected in sequence; the thickness of the first transition section decreases successively along the direction away from the first fixed section; the thickness at the connection between the first transition section and the first fixed section is the same as the thickness of the first fixed section; the socket cavity is provided at one end of the first connection section away from the first fixed section; the second connector includes a second connection section, a second fixed section, and a second transition section connected in sequence; the thickness of the second transition section decreases successively along the direction away from the second fixed section; the thickness at the connection between the second transition section and the second fixed section is the same as the thickness of the second fixed section; a pin chamfer is provided at one end of the second connection section away from the second fixed section; the second connection section is inserted into the socket cavity.

[0018] Optionally, a first chamfer is provided at the end of the first transition section away from the first fixed section, and the first chamfer is in a ratio of the thickness of the first transition section to the length of the first transition section of 1:50 to 1:100; a second chamfer is provided at the end of the second transition section away from the second fixed section, and the second chamfer is in a ratio of the thickness of the second transition section to the length of the second transition section of 1:50 to 1:100; the chamfer of the plug pin is in a ratio of the thickness of the second connecting section to its length of 1:5 to 1:10.

[0019] Optionally, the first main connecting member includes a first main connecting section, a first main fixed section, and a first main transition section connected in sequence; the thickness of the first main transition section decreases sequentially along the direction away from the first main fixed section. The thickness at the connection of the first main transition section and the first main fixed section is the same as the thickness of the first main fixed section. The first main connecting section is provided with the first socket cavity at one end away from the first main fixed section; the first auxiliary connecting member includes a first auxiliary connecting section, a first auxiliary fixed section, and a first auxiliary transition section connected in sequence. The thickness of the first auxiliary transition section decreases sequentially along the direction away from the first auxiliary fixed section.

[0020] The thickness at the connection of the first auxiliary transition section and the first auxiliary fixed section is the same as the thickness of the first auxiliary fixed section. The first auxiliary connecting section is provided with the second socket cavity at one end away from the first auxiliary fixed section; the second main connecting member includes a second main connecting section, a second main fixed section, and a second main transition section connected in sequence; the thickness of the second main transition section decreases sequentially along the direction away from the second main fixed section. The thickness at the connection of the second main transition section and the second main fixed section is the same as the thickness of the second main fixed section. The second main connecting section is provided with a first plug pin chamfer at one end away from the second main fixed section; the second main connecting section is inserted into the first socket cavity. The second auxiliary connecting member includes a second auxiliary connecting section, a second auxiliary fixed section, and a second auxiliary transition section connected in sequence. The thickness of the second auxiliary transition section decreases sequentially along the direction away from the second auxiliary fixed section; the thickness at the connection of the second auxiliary transition section and the second auxiliary fixed section is the same as the thickness of the second auxiliary fixed section. The second auxiliary connecting section is provided with a second plug pin chamfer at one end away from the second auxiliary fixed section; the second auxiliary connecting section is inserted into the second socket cavity.

[0021] Optionally, a first main chamfer is provided at an end of the first main transition section close to the first main beam, and the first main chamfer has a ratio of the thickness of the first main transition section to the length of the first main transition section of 1:50 to 1:100. A second auxiliary chamfer is provided at an end of the first auxiliary transition section close to the first auxiliary beam, and the second auxiliary chamfer has a ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section of 1:50 to 1:100. A second main chamfer is provided at an end of the second main transition section close to the second main beam, and the second main chamfer has a ratio of the thickness of the first main transition section to the length of the first main transition section of 1:50 to 1:100; a second auxiliary chamfer is provided at an end of the second auxiliary transition section close to the second auxiliary beam, and the second auxiliary chamfer has a ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section of 1:50 to 1:100. The first pin chamfer has a ratio of the thickness of the second main connection section to its length of 1:5 to 1:10. The second pin chamfer has a ratio of the thickness of the second auxiliary connection section to its length of 1:5 to 1:10.

[0022] Optionally, the first socket cavity is provided with a first connection hole, the second socket cavity is provided with a second connection hole, the second main connection section is provided with a third connection hole, and the second auxiliary connection section is provided with a fourth connection hole. After the second main connection section is inserted into the first socket cavity, the first connection hole and the third connection hole are matched and aligned, and a first fastener passes through the first connection hole and the third connection hole in sequence to fix the first socket cavity and the second main connection section.

[0023] After the second auxiliary connection section is inserted into the second socket cavity, the second connection hole and the fourth connection hole are matched and aligned, and a second fastener passes through the second connection hole and the fourth connection hole in sequence to fix the second socket cavity and the second auxiliary connection section.

[0024] Optionally, the arrangement of the first connection hole, the second connection hole, the third connection hole, and the fourth connection hole is multi-row and multi-column, wherein the extending direction of the column is the same as the extending direction of the first socket cavity, the second socket cavity, the second main connection section, and the second auxiliary connection section.

[0025] Optionally, the first connection hole, the second connection hole, the third connection hole, and the fourth connection hole are all countersunk holes, and the first fastener and the second fastener are both countersunk head bolts, blind rivets, or Hi-Lok bolts.

[0026] Optionally, the row spacing between every two adjacent rows of connection holes among the first connection hole, the second connection hole, the third connection hole, and the fourth connection hole is greater than or equal to four times the diameter of the connection hole, and the distance between two adjacent connection holes in the same row is greater than or equal to five times the diameter of the connection hole.

[0027] Optionally, the invention further comprises a pressure wing plate and a suction wing plate, wherein the pressure wing plate is arranged on the connecting portion and located on the pressure side, and the suction wing plate is arranged on the connecting portion and located on the suction side. The pressure wing plate and the suction wing plate overlap each other and are aligned with the first blade segment and the second blade segment.

[0028] Optionally, the connection structure is prepared using any one of the following materials: vacuum bag pressing or compression molding of carbon fiber / epoxy resin prepreg composite materials; prepreg molding of glass fiber, aramid fiber, epoxy resin and phenolic resin composite materials; and infusion molding of carbon fiber, glass fiber, aramid fiber, epoxy resin, phenolic resin, and polyurethane resin composite materials.

[0029] Optionally, the first connecting member and the second connecting member are both prefabricated members, and are integrally formed with the first blade segment and the second blade segment respectively through injection molding.

[0030] On the other hand, the present invention further provides a segmented fan blade comprising at least two blade segments, wherein two adjacent blade segments are connected using the segmented fan blade connection structure described above.

[0031] On the other hand, the present invention also provides a method for preparing a blade segment in a segmented wind turbine blade, comprising: a blade segment mold, laying an outer structural cloth layer on the blade segment mold; arranging a prefabricated first connecting member or a second connecting member in the blade segment mold; arranging a blade segment beam in the blade segment mold, and coaxially arranged with the first connecting member or the second connecting member; arranging a core material at the inner surface of the blade segment mold to fix the first connecting member or the second connecting member; laying an inner structural cloth layer in the blade segment mold; the inner structural cloth layer and the outer structural cloth layer are combined to wrap the first connecting member or the second connecting member, and the blade segment beam; performing infusion curing molding in the blade segment mold to obtain a preformed segmented blade segment half shell; arranging a leading edge web and a trailing edge web at the leading edge and trailing edge of the blade segment mold respectively, and closing the mold to obtain the blade segment.

[0032] Optionally, the step of laying the outer structural cloth layer on the blade segment mold includes: laying a first outer structural cloth layer and a second outer structural cloth layer on the pressure surface and the suction surface of the blade segment mold respectively. The step of arranging the prefabricated first connecting member or second connecting member in the blade segment mold includes: placing and fixing the prefabricated main connecting member and auxiliary connecting member on the suction surface near the suction surface in the blade segment mold; placing and fixing the prefabricated main connecting member and auxiliary connecting member on the pressure surface near the pressure surface in the blade segment mold. The step of arranging the core material at the inner surface of the blade segment mold to fix the first connecting member or the second connecting member includes: arranging a first suction surface core material between the main connecting member on the suction surface and the leading edge of the blade segment mold in the blade segment mold; arranging a second suction surface core material between the main connecting member on the suction surface and the auxiliary connecting member on the suction surface; arranging a third suction surface core material between the auxiliary connecting member on the suction surface and the trailing edge of the blade segment mold; arranging a first pressure surface core material between the main connecting member on the pressure surface and the leading edge of the blade segment mold in the blade segment mold; arranging a second pressure surface core material between the main connecting member on the pressure surface and the auxiliary connecting member on the pressure surface; arranging a third pressure surface core material between the auxiliary connecting member on the pressure surface and the trailing edge of the blade segment mold. The step of arranging the blade segment beam in the blade segment mold and coaxially arranging it with the first connecting member or the second connecting member includes: placing and fixing the main pressure beam and the auxiliary pressure beam near the pressure surface in the blade segment mold; the main pressure beam is coaxially arranged with the main connecting member on the pressure surface; the auxiliary pressure beam is coaxially arranged with the auxiliary connecting member on the pressure surface; placing and fixing the main suction beam and the auxiliary suction beam near the suction surface in the blade segment mold; the main suction beam is coaxially arranged with the main connecting member on the suction surface, and the auxiliary suction beam is coaxially arranged with the auxiliary connecting member on the suction surface. The step of laying the inner structural cloth layer in the blade segment mold; the inner structural cloth layer and the outer structural cloth layer are combined to wrap the first connecting member or the second connecting member, and the blade segment beam includes: laying a first inner structural cloth layer and a second inner structural cloth layer in the blade segment mold respectively; the first inner structural cloth layer and the first outer structural cloth layer are combined to wrap the main connecting member on the pressure surface, the auxiliary connecting member on the pressure surface, the main pressure beam and the auxiliary pressure beam near the pressure surface; the second inner structural cloth layer and the second outer structural cloth layer are combined to wrap the main connecting member on the suction surface, the auxiliary connecting member on the suction surface, the main suction beam and the auxiliary suction beam near the suction surface; performing perfusion and curing molding on the inside of the blade segment mold to obtain a preformed segmented blade segment semi-shell; arranging a leading edge web and a trailing edge web at the leading edge and the trailing edge in the blade segment mold respectively to connect the suction surface and the pressure surface, and closing the mold to obtain the blade segment.

[0033] Optionally, it also includes: the first outer structural layer includes a first skin and a first external fixing cloth, the first skin is laid to form the second profile of the suction surface, and the first external fixing cloth is laid below the second profile to form the first profile of the suction surface; the second outer structural layer includes a second skin and a second external fixing cloth, the second skin is laid to form the fourth profile of the pressure surface, and the second external fixing cloth is laid below the fourth profile to form the third profile of the pressure surface; the thickness of the first profile decreases or increases layer by layer along the length direction, and the first profile covers the chamfered area of the suction surface main beam or the suction surface auxiliary beam; the thickness of the third profile decreases or increases layer by layer along the length direction, and the third profile covers the chamfered area of the pressure surface main beam or the pressure surface auxiliary beam.

[0034] Optionally, each of the prefabricated suction surface main connector, suction surface auxiliary connector, pressure surface main connector, and pressure surface auxiliary connector is divided into an interconnected connecting section, a fixed section, and a transition section, wherein the connecting section protrudes from the end surface of the first profile; the transition section is connected to the corresponding main beam or auxiliary beam; the thickness of the pressure surface main beam and the suction surface main beam gradually decreases near one end of the corresponding transition section; the thickness of the pressure surface auxiliary beam and the suction surface auxiliary beam gradually decreases near one end of the corresponding transition section. A transition zone fiber cloth layer is laid between the inner surface of the first or third profile and the transition section and the main beam or auxiliary beam, so that the transition zone is on the same horizontal plane as the main beam or auxiliary beam and the connector.

[0035] The present invention has at least one of the following advantages:

[0036] The present invention provides a segmented wind turbine blade connection structure that makes the connection of segmented blades more reliable, reduces the added mass at the segmented position, and facilitates factory production and on-site operation at wind farms. The first connecting member and the second connecting member provided by the present invention are both prefabricated parts, which are integrally cast with the first blade segment and the second blade segment, respectively. The connection structure provided by the present invention can prevent stress concentration in the segmented blade connection area and improve connection reliability by providing the first and second chamfers (transition sections) and the main fixing section. By using a composite material vacuum-bagging or compression-molded carbon fiber / epoxy resin prepreg to prepare the connection structure, the difficulty of forming the connection structure can be reduced, the risk of forming can be reduced, and the weight of the segmented blade connection components can be greatly reduced.

[0037] Chamfering the pins reduces assembly difficulty at the blade joints and improves assembly efficiency. Prefabricated carbon fiber epoxy resin reinforced composite connectors embedded at both ends of the segmented blades reduce the space requirements for large blade production. This also allows for remote batch production of two blade sections, improving blade forming efficiency and reducing transportation costs. The connection structure provided by this invention offers advantages such as simplicity, low cost, safety, reliability, and strong feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The main structural schematic diagram of a connecting structure of a segmented fan blade provided by an embodiment of the present invention;

[0039] Figure 2 The top view schematic diagram of a connecting structure of a segmented fan blade provided by an embodiment of the present invention;

[0040] Figure 3 The three-dimensional main structural schematic diagram of a segmented fan blade provided by an embodiment of the present invention;

[0041] Figure 4 The cross-sectional schematic diagram of a connecting structure of a segmented fan blade provided by an embodiment of the present invention along the Figure 1 W direction in

[0042] Figure 5 The structural schematic diagram of a first connecting member in a connecting structure of a segmented fan blade provided by an embodiment of the present invention;

[0043] Figure 6 The structural schematic diagram of a second connecting member in a connecting structure of a segmented fan blade provided by an embodiment of the present invention. Specific embodiments

[0044] The following further details a connecting structure of a segmented fan blade, a segmented fan blade and a preparation method proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and all use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and understandable, please refer to the accompanying drawings. It should be known that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions of the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

[0045] Such as Figure 1As shown, this embodiment provides a segmented fan blade connection structure for connecting adjacent first blade segments 1 and second blade segments 2, and the connection structure includes: a first connecting member, the first end of the first connecting member is arranged at one end of the first blade segment 1, and the second end of the first connecting member protrudes from one end of the first blade segment 1; a socket cavity is opened in the end portion of the second end of the first connecting member; a second connecting member, the second end of the second connecting member is arranged at one end of the second blade segment 2, and the first end of the second connecting member protrudes from one end of the second blade segment 2; the first end of the second connecting member matches the socket cavity of the first connecting member, and the first end of the second connecting member is inserted into the socket cavity to form a connecting portion, and the first connecting member and the second connecting member are fixedly connected by fasteners arranged in sequence along the chord direction and passing through the connecting portion.

[0046] In this embodiment, the first connecting member includes a first connecting section, a first fixed section and a first transition section connected in sequence; the thickness of the first transition section decreases in sequence in a direction away from the first fixed section; the thickness of the connection between the first transition section and the first fixed section is the same as the thickness of the first fixed section; the first connecting section is provided with the socket cavity at one end away from the first fixed section; the second connecting member includes a second connecting section, a second fixed section and a second transition section connected in sequence; the thickness of the second transition section decreases in sequence in a direction away from the second fixed section; the thickness of the second transition section is the same as the thickness of the second fixed section; the second connecting section is provided with a pin chamfer at one end away from the second fixed section; the second connecting section is inserted into the socket cavity.

[0047] The end of the first transition section away from the first fixed section is provided with a first chamfer, and the first chamfer is a ratio of the thickness of the first transition section to the length of the first transition section of 1:50 to 1:100; the end of the second transition section away from the second fixed section is provided with a second chamfer, and the second chamfer is a ratio of the thickness of the second transition section to the length of the second transition section of 1:50 to 1:100; the pin chamfer is a ratio of the thickness of the second connecting section to its length of 1:5 to 1:10.

[0048] Combine Figures 1 to 3 As shown, in this embodiment, the first connecting member includes a first main connecting member 501 and a first auxiliary connecting member 401 extending in the same direction.

[0049] Specifically, in this embodiment, there are two first main connecting members 501: for the convenience of description, they are named as: the first suction surface main connecting member and the first pressure surface main connecting member, and the two extend in the same direction.

[0050] There are two first auxiliary connecting members 401 : for the convenience of description, they are named as: a first suction surface auxiliary connecting member and a first pressure surface auxiliary connecting member, and both extend in the same direction.

[0051] The first pressure surface main connecting member and the first pressure surface auxiliary connecting member are arranged close to the pressure surface of the first blade segment 1 .

[0052] The first suction surface main connecting member and the first suction surface auxiliary connecting member are arranged close to the suction surface of the first blade segment 1 .

[0053] The first main connecting member 501 is coaxially arranged with the first main beam 311 in the first blade segment 1 , and the first auxiliary connecting member 401 is coaxially arranged with the first auxiliary beam 312 in the first blade segment 1 .

[0054] Specifically, in this embodiment, there are two first main beams 311 in the first blade segment 1, which are described as: a first pressure side main beam and a first suction side main beam located on the pressure side and the suction side respectively for the sake of distinction.

[0055] There are two first auxiliary beams 312 in the first blade segment 1, which are described as a first pressure side auxiliary beam and a first suction side auxiliary beam located on the pressure side and the suction side respectively for the sake of distinction.

[0056] The first pressure surface main connecting member is coaxially arranged with the first pressure surface main beam.

[0057] The first suction surface main connecting member is coaxially arranged with the first suction surface main beam.

[0058] The first pressure surface auxiliary connecting member is coaxially arranged with the first pressure surface auxiliary beam.

[0059] The first suction surface auxiliary connecting member is coaxially arranged with the first suction surface auxiliary beam.

[0060] Please continue to refer to Figure 1 and Figure 2 As shown, the second connecting member includes a second main connecting member 502 and a second auxiliary connecting member 402 extending in the same direction.

[0061] Specifically, in this embodiment, there are two second main connecting members 502, which are named as follows for the convenience of description: a second pressure surface main connecting member and a second suction surface main connecting member, and the two extend in the same direction.

[0062] There are two second auxiliary connecting members 402 , which are named as follows for the convenience of description: a second pressure surface auxiliary connecting member and a second suction surface auxiliary connecting member, and the two extend in the same direction.

[0063] The second pressure surface main connector and the second pressure surface auxiliary connector are arranged close to the pressure surface of the second blade segment 2.

[0064] The second suction surface main connector and the second suction surface auxiliary connector are arranged close to the suction surface of the second blade segment 2.

[0065] Please continue to refer to Figure 1 and Figure 2 As shown, in this embodiment, the second main connector 502 is coaxially arranged with the second main beam 301 in the second blade segment 2, and the second auxiliary connector 402 is coaxially arranged with the second auxiliary beam 302 in the second blade segment 2.

[0066] Specifically, there are two second main beams 301 in the second blade segment 2: the second pressure surface main beam and the second suction surface main beam.

[0067] There are two second auxiliary beams 302 in the second blade segment 2: the second pressure surface auxiliary beam and the second suction surface auxiliary beam.

[0068] The second pressure surface main connector is coaxially arranged with the second pressure surface main beam.

[0069] The second suction surface main connector is coaxially arranged with the second suction surface main beam.

[0070] The second pressure surface auxiliary connector is coaxially arranged with the second pressure surface auxiliary beam.

[0071] The second suction surface auxiliary connector is coaxially arranged with the second suction surface auxiliary beam.

[0072] The first main connector 501 and the second main connector 502 are arranged opposite to each other; one end of the first main connector 501 close to the second main connector 502 is provided with a first socket cavity, and one end of the second main connector 502 is inserted into the first socket cavity. The first auxiliary connector 401 and the second auxiliary connector 402 are arranged opposite to each other, one end of the first auxiliary connector 401 close to the second auxiliary connector 402 is provided with a second socket cavity, and one end of the second auxiliary connector 402 is inserted into the second socket cavity.

[0073] Combined with Figure 1 and Figure 5 As shown, the first main connector 501 and the first auxiliary connector 401 are similar in overall structure, only with some differences in width in the direction along W. Therefore, the structures of both can be referred to simultaneously Figure 5As shown, the first main connecting piece 501 includes a first main connecting section 5011, a first main fixing section 5012, and a first main transition section 5013 that are connected in sequence; the thickness of the first main transition section 5013 gradually decreases in the direction away from the first main fixing section 5012.

[0074] The thickness at the connection between the first main transition section 5013 and the first main fixing section 5012 is the same as the thickness of the first main fixing section 5012.

[0075] One end of the first main connecting section 5011 away from the first main fixing section 5012 is provided with the first socket cavity 5014.

[0076] The first auxiliary connecting piece includes a first auxiliary connecting section, a first auxiliary fixing section, and a first auxiliary transition section that are connected in sequence. The thickness of the first auxiliary transition section gradually decreases in the direction away from the first auxiliary fixing section. The thickness at the connection between the first auxiliary transition section and the first auxiliary fixing section is the same as the thickness of the first auxiliary fixing section. One end of the first auxiliary connecting section away from the first auxiliary fixing section is provided with the second socket cavity.

[0077] Combined Figure 1 and Figure 6 As shown, the second main connecting piece 502 and the second auxiliary connecting piece 402 are similar in overall structure, only having some differences in width in the direction along W. Therefore, the structures of both can be seen simultaneously Figure 6 As shown, the second main connecting piece 502 includes a second main connecting section 5021, a second main fixing section 5022, and a second main transition section 5023 that are connected in sequence; the thickness of the second main transition section 5023 gradually decreases in the direction away from the second main fixing section 5022.

[0078] The thickness at the connection between the second main transition section 5023 and the second main fixing section 5022 is the same as the thickness of the second main fixing section 5022.

[0079] One end of the second main connecting section 5021 away from the second main fixing section 5022 is provided with a first pin chamfer 5024; the thickness of the second main connecting section 5021 is less than that of the second main fixing section 5022, and it is matched with the first socket cavity 5014.

[0080] After the second main connecting section 5021 is inserted into the first socket cavity 5014, the cavity thickness 5015 of the first socket cavity 5014 is matched with the thickness 5025 of the second main fixing section 5 at a position higher than the second main connecting section 5021, and the two are aligned and conform to the shape.

[0081] The second auxiliary connecting member 402 includes a second auxiliary connecting section, a second auxiliary fixing section, and a second auxiliary transition section that are connected in sequence. The thickness of the second auxiliary transition section gradually decreases in the direction away from the second auxiliary fixing section; the thickness at the connection between the second auxiliary transition section and the second auxiliary fixing section is the same as the thickness of the second auxiliary fixing section. One end of the second auxiliary connecting section away from the second auxiliary fixing section is provided with a second pin chamfer; the second auxiliary connecting section is inserted into the second socket cavity.

[0082] One end of the first main transition section 5013 close to the first main beam 311 is provided with a first main chamfer, and the first main chamfer is in a ratio of the thickness of the first main transition section 5013 to the length of the first main transition section 5013 of 1:50 to 1:100.

[0083] One end of the first auxiliary transition section close to the first auxiliary beam 312 is provided with a second auxiliary chamfer, and the second auxiliary chamfer is in a ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section of 1:50 to 1:100.

[0084] One end of the second main transition section close to the second main beam is provided with a second main chamfer, and the second main chamfer is in a ratio of the thickness of the first main transition section to the length of the first main transition section of 1:50 to 1:100;

[0085] One end of the second auxiliary transition section close to the second auxiliary beam is provided with a second auxiliary chamfer, and the second auxiliary chamfer is in a ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section of 1:50 to 1:100.

[0086] The first pin chamfer 5024 is in a ratio of the thickness of the second main connecting section 5021 to its length of 1:5 to 1:10. The second pin chamfer is in a ratio of the thickness of the second auxiliary connecting section to its length of 1:5 to 1:10.

[0087] Please continue to refer to Figure 1 As shown, the first socket cavity 5014 is provided with a first connection hole 901, the second socket cavity is provided with a second connection hole, the second main connecting section 5021 is provided with a third connection hole 902, and the second auxiliary connecting section is provided with a fourth connection hole.

[0088] After the second main connecting section 5021 is inserted into the first socket cavity 5014, the first connection hole 901 and the third connection hole 902 are matched and aligned, and the first socket cavity 5014 and the second main connecting section 5021 are fixed by a first fastener passing through the first connection hole 901 and the third connection hole 902 in sequence.

[0089] After the second auxiliary connection section is inserted into the second socket cavity, the second connection hole and the fourth connection hole are matched and aligned, and the second socket cavity and the second auxiliary connection section are fixed by sequentially passing a second fastener through the second connection hole and the fourth connection hole. Thus, the connection of the two blade segments is achieved.

[0090] Please continue to refer to Figure 1 As shown, the arrangement of the first connection hole 901, the second connection hole, the third connection hole 902 and the fourth connection hole is multi-row and multi-column, wherein the extending direction of the column is the same as the extending direction of the first socket cavity 5014, the second socket cavity, the second main connection section 5021 and the second auxiliary connection section.

[0091] In this embodiment, the number of columns of the connection holes is preferably 3 columns or more.

[0092] In this embodiment, the first connection hole 901, the second connection hole, the third connection hole 902 and the fourth connection hole are all countersunk holes, and the first fastener and the second fastener are both countersunk head bolts, blind rivets or Hi-Lok bolts.

[0093] In this embodiment, the row spacing between every two adjacent rows of connection holes among the first connection hole 901, the second connection hole, the third connection hole 902 and the fourth connection hole is greater than or equal to four times the diameter of the connection hole, and the distance between two adjacent connection holes in the same row is greater than or equal to five times the diameter of the connection hole.

[0094] Please continue to refer to Figure 1 and Figure 2 As shown, in this embodiment, the connection structure further includes two wing-shaped covers 6, which are described as a pressure wing-shaped plate and a suction wing-shaped plate for easy distinction. The pressure wing-shaped plate is arranged on the connection part and located on the pressure surface, and the suction wing-shaped plate is arranged on the connection part and located on the suction surface.

[0095] The pressure wing-shaped plate and the suction wing-shaped plate cover each other and are aligned and conform to the shape of the first blade segment 1 and the second blade segment 2.

[0096] In this embodiment, the connection structure is prepared by using any one of the following materials: carbon fiber / epoxy prepreg composite material by vacuum bag pressing or molding; using glass fiber, aramid fiber, epoxy resin and phenolic resin prepreg to form a composite material; using carbon fiber, glass fiber, aramid fiber, epoxy resin, phenolic resin and polyurethane resin by casting molding to form a composite material. Specifically, for the fiber materials, one or several of them can be optionally mixed and used, and for the resin materials, only one of them can be optionally selected.

[0097] In this embodiment, the first connecting member and the second connecting member are both prefabricated members, which are integrally molded with the first blade segment and the second blade segment, respectively. The connection structure has the following beneficial effects: 1) the first and second chamfers (transition sections) and the main fixing section are provided to prevent stress concentration in the connection area of the segmented blades and improve the connection reliability; 2) the use of composite materials vacuum-bagging or compression-molded carbon fiber / epoxy resin prepregs can reduce the difficulty of forming the connection structure, reduce the molding risk, and significantly reduce the weight of the segmented blade connection components; 3) the provision of latch chamfers can reduce the difficulty of assembling the blade connection and improve assembly efficiency; 4) by pre-embedding the prefabricated carbon fiber epoxy resin reinforced composite connectors at both ends of the segmented blades, the space requirements for large blade production can be reduced, and the two sections of the blade can be mass-produced in different locations, thereby improving the blade molding efficiency and reducing the blade transportation cost; 5) the connection structure is simple, low-cost, safe and reliable, and highly feasible.

[0098] On the other hand, this embodiment further provides a segmented fan blade, comprising at least two blade segments, wherein two adjacent blade segments are connected using the segmented fan blade connection structure described above.

[0099] Please continue to refer to Figures 1 to 6 As shown, on the other hand, this embodiment also provides a method for preparing blade segments in a segmented wind turbine blade, including: step S1, providing a blade segment mold, the blade segment mold can be a first blade segment mold and a second blade segment mold, which are located in the same plane in the connecting area.

[0100] Step S2: laying an outer structural fabric layer on the blade segment mold.

[0101] Step S3: arranging a prefabricated first connecting member or a prefabricated second connecting member in the blade segment mold.

[0102] Step S4: arranging a blade segment beam in the blade segment mold, and coaxially arranging the blade segment beam with the first connecting member or the second connecting member.

[0103] Step S5: arranging a core material on the inner surface of the blade segment mold to fix the first connecting member or the second connecting member.

[0104] Step S6: laying an inner structural fabric layer in the blade segment mold; the inner structural fabric layer is combined with the outer structural fabric layer to wrap the first connector or the second connector, and the blade segment beam.

[0105] Step S7: performing infusion curing molding in the blade segment mold to obtain a preformed segmented blade segment half shell.

[0106] Step S8: Respectively arrange a leading-edge web and a trailing-edge web at the leading edge and the trailing edge within the blade segment mold, and close the mold to obtain the blade segment.

[0107] Step S2 includes: Preparing the prefabricated segmented fan blade connection structure described in the above embodiment, and respectively laying a first outer structure cloth layer and a second outer structure cloth layer on the pressure surface and the suction surface of the blade segment mold. The first outer structure cloth layer forms the suction surface, and the second outer structure cloth layer forms the pressure surface.

[0108] Step S3 includes: Placing and fixing the prefabricated suction surface main connector and suction surface auxiliary connector near the suction surface within the blade segment mold; placing and fixing the prefabricated pressure surface main connector and pressure surface auxiliary connector near the pressure surface within the blade segment mold.

[0109] Step S5 includes: Arranging a first suction surface core material 314 between the suction surface main connector and the leading edge of the blade segment mold; in this embodiment, as Figure 4 shown, if the blade segment mold is the first blade segment mold, then the suction surface main connector here is the first main connector (first suction surface main connector) 501 located on the suction surface.

[0110] Arranging a second suction surface core material 315 between the suction surface main connector and the suction surface auxiliary connector; in this embodiment, as Figure 4 shown, if the blade segment mold is the first blade segment mold, then the suction surface main connector here is the first main connector (first suction surface main connector) 501 located on the suction surface. The suction surface auxiliary connector is the first auxiliary connector (first suction surface auxiliary connector) 401 located on the suction surface.

[0111] Arranging a third suction surface core material 316 between the suction surface auxiliary connector and the trailing edge of the blade segment mold; in this embodiment, if the blade segment mold is the first blade segment mold, then the suction surface auxiliary connector here is the first auxiliary connector (first suction surface auxiliary connector) 401 located on the suction surface.

[0112] Arranging a first pressure surface core material 317 between the pressure surface main connector and the leading edge of the blade segment mold; in this embodiment, as Figure 4 shown, if the blade segment mold is the first blade segment mold, then the pressure surface main connector here is the first main connector (first pressure surface main connector) 501 located on the pressure surface.

[0113] The core material is PVC / PET foam or balsa wood. The second core material (the second pressure side core material or the second suction side core material) is the same thickness as the prefabricated connector. The first core material (the first pressure side core material or the first suction side core material) has a 1:5 chamfer on the side facing away from the prefabricated connector. The third core material (the third pressure side core material or the third suction side core material) has one side the same thickness as the connector and one side with a 1:5 chamfer. The main fixing section of the prefabricated connector is flush with the end surface of the external fixing cloth. The first, second, and third core materials are used to secure the prefabricated connector, preventing it from slipping along the width direction, which would result in the first and second connectors not being fully aligned after molding. This also reduces the number of prefabricated components used and reduces connection costs.

[0114] A second pressure surface core material 318 is provided between the pressure surface main connection member and the pressure surface auxiliary connection member; in this embodiment, Figure 4 As shown, if the blade segment mold is a first blade segment mold, the pressure side main connector is the first main connector (first pressure side main connector) 501 located on the pressure side. The pressure side auxiliary connector is the first auxiliary connector (first pressure side auxiliary connector) 401 located on the pressure side.

[0115] A third pressure surface core material 319 is arranged between the pressure surface auxiliary connector and the trailing edge of the blade segment mold; in this embodiment, if the blade segment mold is the first blade segment mold, the pressure surface auxiliary connector here is the first auxiliary connector (first pressure surface auxiliary connector) 401 located on the pressure surface.

[0116] The step S4 includes: placing and fixing a pressure surface main beam and a pressure surface auxiliary beam close to the pressure surface in the blade segment mold;

[0117] The pressure surface main beam and the pressure surface main connecting member are coaxially arranged; the pressure surface auxiliary beam and the pressure surface auxiliary connecting member are coaxially arranged.

[0118] In the blade segment mold, a suction surface main beam and a suction surface auxiliary beam are placed and fixed close to the suction surface; the suction surface main beam and the suction surface main connecting member are coaxially arranged, and the suction surface auxiliary beam and the suction surface auxiliary connecting member are coaxially arranged.

[0119] The step S6 includes: laying a first inner structural cloth layer and a second inner structural cloth layer in the blade segment mold respectively; the first inner structural cloth layer and the first outer structural cloth layer are combined to wrap the pressure surface main connecting part, the pressure surface auxiliary connecting part, the pressure surface main beam and the pressure surface auxiliary beam close to the pressure surface.

[0120] The second inner structural cloth layer is combined with the second outer structural cloth layer to wrap the suction surface main connecting member, the suction surface auxiliary connecting member, the suction surface main beam and the suction surface auxiliary beam close to the suction surface.

[0121] The step S8 includes: respectively arranging a leading-edge web and a trailing-edge web at the leading edge and the trailing edge in the blade segment mold to connect the suction surface and the pressure surface, and closing the mold to obtain the blade segment. In this embodiment, an epoxy adhesive is used for web bonding, that is, to bond the pressure surface and the suction surface. Repeating the above process can obtain another blade segment. After post-processing and painting the obtained first blade segment and second blade segment, they can be shipped to the wind farm for assembly and connection.

[0122] In this embodiment, it further includes: The first outer structure layer includes a first skin 10 and a first outer fixing cloth 11. The first skin 10 is laid to form the second surface 703 of the suction surface, and the first outer fixing cloth 11 is laid below the second surface 703 to form the first surface 701 of the suction surface; The first surface 701 protrudes outward compared with the second surface 703, and the protruding part is used to carry the airfoil cover 6.

[0123] Specifically, the first outer fixing cloth 11 is adjacent to the connecting piece. In the length direction, it starts from the fixed section of the connecting piece. The first skin 10 is laid on the outermost side. The starting position of the first skin 10 in the length direction is shorter than that of the first outer fixing cloth 11. Therefore, a thickness difference is formed, that is, the first surface 701 protrudes outward compared with the second surface 703, and the protruding part is used to carry the airfoil cover 6.

[0124] The second outer structure layer includes a second skin 12 and a second outer fixing cloth 13. The second skin 12 is laid to form the fourth surface of the pressure surface, and the second outer fixing cloth 13 is laid below the fourth surface to form the third surface of the pressure surface; The third surface protrudes outward compared with the fourth surface, and the protruding part is used to carry the airfoil cover 6.

[0125] Specifically, the second outer fixing cloth 13 is adjacent to the connecting piece. In the length direction, it starts from the fixed section of the connecting piece. The second skin 12 is laid on the outermost side. The starting position of the second skin 12 in the length direction is shorter than that of the second outer fixing cloth 13. Therefore, a thickness difference is formed, that is, the third surface protrudes outward compared with the fourth surface, and the protruding part is used to carry the airfoil cover 6.

[0126] Two edges 801 and 802 of the airfoil cover 6 extending along the W direction are respectively carried on the first surface 701 of the first blade segment 1 and the first surface 702 of the second blade segment 2; And the thicknesses of the two edges 801 and 802 of the airfoil cover 6 are equal to the thickness of the second surface 703 on the first blade segment and the second surface 704 on the second blade segment respectively and are conforming.

[0127] The thickness of the first profiled surface 701 decreases or increases layer by layer along the length direction, and the first profiled surface 701 covers the chamfered area of the suction surface main beam or the suction surface auxiliary beam.

[0128] The thickness of the third profiled surface decreases or increases layer by layer along the length direction, and the third profiled surface covers the chamfered area of the pressure surface main beam or the pressure surface auxiliary beam.

[0129] In this embodiment, the first inner structural cloth layer includes a third skin 14 and a first inner fixing cloth 15, and the second inner structural cloth layer includes a fourth skin 16 and a second inner fixing cloth 17.

[0130] The materials of the first skin to the fourth skin are the same, and the materials of the first outer fixing cloth, the second outer fixing cloth, the first inner fixing cloth and the second inner fixing cloth are the same, and can be biaxial woven cloth.

[0131] The first outer fixing cloth 11 can be laid from the first profiled surface 701 along the length direction towards the first main beam 311, decreasing (increasing) layer by layer in the length direction and ending at the first main beam chamfered area, and laid along the cross-section in the width direction; the first outer fixing cloth or the first inner fixing cloth is preferably laid in 5 to 15 layers. The laying method of the second outer fixing cloth is the same as that of the first outer fixing cloth and will not be elaborated here.

[0132] The first inner fixing cloth is a biaxial woven cloth, laid from the first profiled surface along the length direction towards the first main (auxiliary) beam, decreasing (increasing) layer by layer in the length direction and ending at the main (auxiliary) beam chamfered area, and covering to the edges of the first and third core materials in the width direction; combined with the outer fixing cloth, wrapping the connecting piece and the core material, preferably laid in 5 to 15 layers. The laying method of the second inner fixing cloth is the same as that of the first inner fixing cloth and will not be elaborated here.

[0133] In this embodiment, according to the above description, each of the prefabricated suction surface main connecting piece, suction surface auxiliary connecting piece, pressure surface main connecting piece and pressure surface auxiliary connecting piece is divided into a connecting section, a fixing section and a transition section that are connected to each other, wherein the connecting section protrudes from the end face of the first profiled surface. The transition section is connected to the corresponding main beam or auxiliary beam; the thickness of the pressure surface main beam and the suction surface main beam gradually becomes thinner at one end close to the corresponding transition section; that is, a chamfer is provided, and the chamfer is 1:50 to 1:100; reducing stress concentration in the connection area. The thickness of the pressure surface auxiliary beam and the suction surface auxiliary beam gradually becomes thinner at one end close to the corresponding transition section, that is, a chamfer is provided, and the chamfer is 1:50 to 1:100; reducing stress concentration in the connection area.

[0134] A transition zone fiber cloth layer is laid between the inner surface of the first profiled surface or the third profiled surface and the transition section and the main beam or auxiliary beam, so that the transition zone, the main beam or auxiliary beam and the connecting piece are on the same horizontal plane.

[0135] In this embodiment, the fiber cloth layer in the transition zone is preferably a uniaxial glass fiber woven cloth, which is laid layer by layer with the connecting parts and the main (auxiliary) beams, and the number of layers is preferably 10 to 20. After laying, the transition zone is made to be on the same horizontal plane as the main beam and the connecting parts, and the connection stability at this position can be improved.

[0136] This embodiment prefabricated carbon fiber-epoxy-reinforced composite connectors are embedded at both ends of the segmented blades. This reduces the space required for large blade production and enables remote batch production of the two blade segments, improving blade molding efficiency and reducing blade transportation costs. The prefabricated connectors are integrally molded with the blade body, ensuring casing strength while effectively reducing the weight introduced by the fairing casing.

[0137] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0138] In the description of the present invention, it should be understood that the terms "center," "height," "thickness," "up," "down," "vertical," "horizontal," "top," "bottom," "inside," "outside," "axial," "radial," "circumferential," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0139] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0140] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is less than that of the second feature.

[0141] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be construed as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and alternatives to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A segmented fan blade connection structure, characterized in that, For connecting between an adjacent first blade segment and a second blade segment, the connecting structure includes: a non-metallic first connecting member, a first end of the first connecting member is disposed at one end of the first blade segment, and a second end of the first connecting member protrudes from one end of the first blade segment; an insertion cavity is formed in an end portion of the second end of the first connecting member; a non-metallic second connecting member, a second end of the second connecting member is disposed at one end of the second blade segment, and a first end of the second connecting member protrudes from one end of the second blade segment; the first end of the second connecting member is matched with the insertion cavity of the first connecting member, the first end of the second connecting member is inserted into the insertion cavity to form a connecting portion, and fasteners are sequentially arranged in a chordal direction and penetrate through the connecting portion to fixedly connect the first connecting member and the second connecting member; the first connecting member includes a first connecting segment, a first fixing segment and a first transition segment that are sequentially connected; a first chamfer is provided at an end of the first transition segment away from the first fixing segment; the second connecting member includes a second connecting segment, a second fixing segment and a second transition segment that are sequentially connected; a second chamfer is provided at an end of the second transition segment away from the second fixing segment.

2. The segmented fan blade connecting structure according to claim 1, wherein the first connecting member includes a first main connecting member and a first auxiliary connecting member having the same extending direction; the first main connecting member is coaxially arranged with a first main beam in the first blade segment, and the first auxiliary connecting member is coaxially arranged with a first auxiliary beam in the first blade segment; the second connecting member includes a second main connecting member and a second auxiliary connecting member having the same extending direction; the second main connecting member is coaxially arranged with a second main beam in the second blade segment, and the second auxiliary connecting member is coaxially arranged with a second auxiliary beam in the second blade segment; the first main connecting member and the second main connecting member are oppositely arranged; a first insertion cavity is provided at an end of the first main connecting member close to the second main connecting member, one end of the second main connecting member is inserted into the first insertion cavity; the first auxiliary connecting member and the second auxiliary connecting member are oppositely arranged, a second insertion cavity is provided at an end of the first auxiliary connecting member close to the second auxiliary connecting member, one end of the second auxiliary connecting member is inserted into the second insertion cavity.

3. The segmented fan blade connecting structure according to claim 2, wherein the first main connecting member includes a first pressure surface main connecting member and a first suction surface main connecting member having the same extending direction; the first auxiliary connecting member includes a first pressure surface auxiliary connecting member and a first suction surface auxiliary connecting member having the same extending direction; the first pressure surface main connecting member and the first pressure surface auxiliary connecting member are arranged close to the pressure surface of the first blade segment; the first suction surface main connecting member and the first suction surface auxiliary connecting member are arranged close to the suction surface of the first blade segment; the first main beam in the first blade segment includes: a first pressure surface main beam and a first suction surface main beam; the first auxiliary beam in the first blade segment includes: a first pressure surface auxiliary beam and a first suction surface auxiliary beam; The main connecting piece of the first pressure surface is coaxially connected with the main beam of the first pressure surface; The main connecting piece of the first suction surface is coaxially connected with the main beam of the first suction surface; The auxiliary connecting piece of the first pressure surface is coaxially connected with the auxiliary beam of the first pressure surface; The auxiliary connecting piece of the first suction surface is coaxially connected with the auxiliary beam of the first suction surface; The second main connecting piece includes a second pressure surface main connecting piece and a second suction surface main connecting piece with the same extending direction; The second auxiliary connecting piece includes a second pressure surface auxiliary connecting piece and a second suction surface auxiliary connecting piece with the same extending direction; The second pressure surface main connecting piece and the second pressure surface auxiliary connecting piece are arranged close to the pressure surface of the second blade segment; The second suction surface main connecting piece and the second suction surface auxiliary connecting piece are arranged close to the suction surface of the second blade segment; The second main beam in the second blade segment includes: a second pressure surface main beam and a second suction surface main beam; The second auxiliary beam in the second blade segment includes: a second pressure surface auxiliary beam and a second suction surface auxiliary beam; The second pressure surface main connecting piece is coaxially connected with the second pressure surface main beam; The second suction surface main connecting piece is coaxially connected with the second suction surface main beam; The second pressure surface auxiliary connecting piece is coaxially connected with the second pressure surface auxiliary beam; The second suction surface auxiliary connecting piece is coaxially connected with the second suction surface auxiliary beam.

4. The segmented fan blade connection structure according to claim 1, wherein the thickness of the first transition section decreases successively along the direction away from the first fixed section; the thickness at the connection of the first transition section and the first fixed section is the same as the thickness of the first fixed section; the socket cavity is provided at one end of the first connection section away from the first fixed section; the thickness of the second transition section decreases successively along the direction away from the second fixed section; the thickness at the connection of the second transition section and the second fixed section is the same as the thickness of the second fixed section; a pin chamfer is provided at one end of the second connection section away from the second fixed section; the second connection section is inserted into the socket cavity.

5. The segmented fan blade connection structure according to claim 4, wherein the first chamfer is the ratio of the thickness of the first transition section to the length of the first transition section of 1:50 to 1:100; the second chamfer is the ratio of the thickness of the second transition section to the length of the second transition section of 1:50 to 1:100; the pin chamfer is the ratio of the thickness of the second connection section to its length of 1:5 to 1:

10.

6. The segmented fan blade connection structure according to claim 3, characterized in that, The first main connecting piece includes a first main connection section, a first main fixed section and a first main transition section connected in sequence; the thickness of the first main transition section decreases successively along the direction away from the first main fixed section; the thickness at the connection of the first main transition section and the first main fixed section is the same as the thickness of the first main fixed section; the first socket cavity is provided at one end of the first main connection section away from the first main fixed section; The first auxiliary connecting piece includes a first auxiliary connection section, a first auxiliary fixed section and a first auxiliary transition section connected in sequence; the thickness of the first auxiliary transition section decreases successively along the direction away from the first auxiliary fixed section; The thickness at the connection between the first auxiliary transition section and the first auxiliary fixed section is the same as the thickness of the first auxiliary fixed section; One end of the first auxiliary connection section away from the first auxiliary fixed section is provided with the second socket cavity; The second main connecting piece includes a second main connecting section, a second main fixed section and a second main transition section connected in sequence; the thickness of the second main transition section gradually decreases along the direction away from the second main fixed section; The thickness at the connection between the second main transition section and the second main fixed section is the same as the thickness of the second main fixed section; One end of the second main connecting section away from the second main fixed section is provided with a first pin chamfer; the second main connecting section is inserted into the first socket cavity; The second auxiliary connecting piece includes a second auxiliary connecting section, a second auxiliary fixed section and a second auxiliary transition section connected in sequence; The thickness of the second auxiliary transition section gradually decreases along the direction away from the second auxiliary fixed section; The thickness at the connection between the second auxiliary transition section and the second auxiliary fixed section is the same as the thickness of the second auxiliary fixed section; One end of the second auxiliary connecting section away from the second auxiliary fixed section is provided with a second pin chamfer; the second auxiliary connecting section is inserted into the second socket cavity.

7. The segmented fan blade connection structure according to claim 6, wherein One end of the first main transition section close to the first main beam is provided with a first main chamfer, and the first main chamfer is the ratio of the thickness of the first main transition section to the length of the first main transition section of 1:50 to 1:100; One end of the first auxiliary transition section close to the first auxiliary beam is provided with a first auxiliary chamfer, and the first auxiliary chamfer is the ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section of 1:50 to 1:100; One end of the second main transition section close to the second main beam is provided with a second main chamfer, and the second main chamfer is the ratio of the thickness of the first main transition section to the length of the first main transition section of 1:50 to 1:100; One end of the second auxiliary transition section close to the second auxiliary beam is provided with a second auxiliary chamfer, and the second auxiliary chamfer is the ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section of 1:50 to 1:100; The first pin chamfer is the ratio of the thickness of the second main connecting section to its length of 1:5 to 1:10; The second pin chamfer is the ratio of the thickness of the second auxiliary connecting section to its length of 1:5 to 1:

10.

8. The segmented fan blade connection structure according to claim 7, characterized in that, The first socket cavity is provided with a first connection hole, the second socket cavity is provided with a second connection hole, the second main connecting section is provided with a third connection hole, and the second auxiliary connecting section is provided with a fourth connection hole; After the second main connecting section is inserted into the first socket cavity, the first connection hole and the third connection hole are matched and aligned, and a first fastener passes through the first connection hole and the third connection hole in sequence to fix the first socket cavity and the second main connecting section; After the second auxiliary connecting section is inserted into the second socket cavity, the second connection hole and the fourth connection hole are matched and aligned, and a second fastener passes through the second connection hole and the fourth connection hole in sequence to fix the second socket cavity and the second auxiliary connecting section.

9. The segmented fan blade connection structure according to claim 8, characterized in that, The arrangement of the first connection hole, the second connection hole, the third connection hole and the fourth connection hole is multi-row and multi-column, wherein the extending direction of the column is the same as the extending direction of the first socket cavity, the second socket cavity, the second main connection section and the second auxiliary connection section.

10. The segmented fan blade connection structure according to claim 9, wherein the first connection hole, the second connection hole, the third connection hole and the fourth connection hole are all countersunk holes, and the first fastener and the second fastener are both countersunk head bolts, blind rivets or Hi-Lok bolts.

11. The segmented fan blade connection structure according to claim 10, wherein the row spacing between every two adjacent rows of connection holes among the first connection hole, the second connection hole, the third connection hole and the fourth connection hole is greater than or equal to four times the diameter of the connection hole, and the distance between two adjacent connection holes in the same row is greater than or equal to five times the diameter of the connection hole.

12. The segmented fan blade connection structure according to claim 11, wherein, It further includes a pressure airfoil plate and a suction airfoil plate. The pressure airfoil plate is arranged on the connection part and located on the pressure surface, and the suction airfoil plate is arranged on the connection part and located on the suction surface; the pressure airfoil plate and the suction airfoil plate cover each other and are aligned and conformal with the first blade segment and the second blade segment.

13. The segmented fan blade connection structure according to claim 12, characterized in that, The connection structure is prepared by any one of the following materials: carbon fiber / epoxy prepreg composite material formed by vacuum bag pressing or molding; formed by glass fiber, aramid fiber, epoxy resin and phenolic resin prepreg composite material; formed by carbon fiber, glass fiber, aramid fiber, epoxy resin, phenolic resin and polyurethane resin by infusion molding.

14. The segmented fan blade connection structure according to claim 1, wherein the first connecting piece and the second connecting piece are both prefabricated parts and are integrally potted with the first blade segment and the second blade segment respectively.

15. A segmented fan blade, characterized in that, It includes at least two blade segments, and the adjacent two blade segments are connected by the segmented fan blade connection structure according to any one of claims 1-14.

16. A method for preparing a blade segment in a segmented fan blade, characterized in that, It includes: a blade segment mold, laying an outer structure cloth layer on the blade segment mold; arranging a prefabricated non-metallic first connecting piece or a non-metallic second connecting piece in the blade segment mold; arranging a blade segment beam in the blade segment mold and coaxially setting it with the first connecting piece or the second connecting piece; arranging a core material on the inner surface of the blade segment mold to fix the first connecting piece or the second connecting piece; The first connecting piece includes a first connecting section, a first fixing section and a first transition section connected in sequence; a first chamfer is provided at the end of the first transition section away from the first fixing section; The second connecting piece includes a second connecting section, a second fixing section and a second transition section connected in sequence; a second chamfer is provided at the end of the second transition section away from the second fixing section; laying an inner structure cloth layer in the blade segment mold; the inner structure cloth layer and the outer structure cloth layer are combined to wrap the first connecting piece or the second connecting piece, and the blade segment beam; performing potting and curing molding on the inside of the blade segment mold to obtain a preformed segmented blade segment semi-shell; A leading edge web and a trailing edge web are respectively provided at the leading edge and the trailing edge in the blade segment mold, and the molds are closed to obtain the blade segment.

17. The method for preparing a blade segment in the segmented fan blade according to claim 16, wherein the step of laying an outer structural cloth layer on the blade segment mold comprises: laying a first outer structural fabric layer and a second outer structural fabric layer on the pressure surface and the suction surface of the blade segment mold respectively; The step of arranging a prefabricated first connecting member or a prefabricated second connecting member in the blade segment mold comprises: A prefabricated suction surface main connecting member and a prefabricated suction surface auxiliary connecting member are placed and fixed near the suction surface in the blade segment mold; a prefabricated pressure surface main connecting member and a prefabricated pressure surface auxiliary connecting member are placed and fixed near the pressure surface in the blade segment mold; The step of providing a core material on the inner surface of the blade segment mold to fix the first connecting member or the second connecting member includes: A first suction surface core material is provided in the blade segment mold between the suction surface main connecting member and the leading edge of the blade segment mold; A second suction surface core material is provided between the suction surface main connecting member and the suction surface auxiliary connecting member; A third suction surface core material is provided between the suction surface auxiliary connecting piece and the trailing edge of the blade segment mold; A first pressure surface core material is provided in the blade segment mold between the pressure surface main connecting member and the leading edge of the blade segment mold; A second pressure surface core material is provided between the pressure surface main connecting member and the pressure surface auxiliary connecting member; A third pressure surface core material is provided between the pressure surface auxiliary connecting piece and the trailing edge of the blade segment mold; The step of arranging the blade segment beam in the blade segment mold and coaxially arranging the blade segment beam with the first connecting member or the second connecting member comprises: In the blade segment mold, a pressure surface main beam and a pressure surface auxiliary beam are placed and fixed close to the pressure surface; The pressure surface main beam and the pressure surface main connecting member are coaxially arranged; the pressure surface auxiliary beam and the pressure surface auxiliary connecting member are coaxially arranged; In the blade segment mold, a suction surface main beam and a suction surface auxiliary beam are placed and fixed near the suction surface; The suction surface main beam and the suction surface main connecting member are coaxially arranged, and the suction surface auxiliary beam and the suction surface auxiliary connecting member are coaxially arranged; The steps of laying an inner structural cloth layer in the blade segment mold; combining the inner structural cloth layer with the outer structural cloth layer to wrap the first connector or the second connector, and the blade segment beam include: A first inner structural fabric layer and a second inner structural fabric layer are respectively laid in the blade segment mold; the first inner structural fabric layer is combined with the first outer structural fabric layer to wrap the pressure surface main connecting member, the pressure surface auxiliary connecting member, the pressure surface main beam and the pressure surface auxiliary beam close to the pressure surface; The second inner structural cloth layer and the second outer structural cloth layer are combined to wrap the suction surface main connecting member, the suction surface auxiliary connecting member, the suction surface main beam and the suction surface auxiliary beam close to the suction surface; Performing infusion curing molding on the blade segment in a mold to obtain a preformed segmented blade segment half shell; A leading edge web and a trailing edge web are respectively provided at the leading edge and the trailing edge in the blade segment mold to connect the suction surface and the pressure surface, and the mold is closed to obtain the blade segment.

18. The preparation method of the blade segment in the segmented fan blade according to claim 17, characterized in that, Also includes: The first outer structural layer includes a first skin and a first outer fixing cloth. The first skin is laid to form the second surface of the suction surface, and the first outer fixing cloth is laid below the second surface to form the first surface of the suction surface; The second outer structural layer includes a second skin and a second outer fixing cloth. The second skin is laid to form the fourth surface of the pressure surface, and the second outer fixing cloth is laid below the fourth surface to form the third surface of the pressure surface; The thickness of the first surface decreases or increases layer by layer along the length direction, and the first surface covers the chamfered area of the main beam or auxiliary beam of the suction surface; The thickness of the third surface decreases or increases layer by layer along the length direction, and the third surface covers the chamfered area of the main beam or auxiliary beam of the pressure surface.

19. The preparation method of the blade segment in the segmented fan blade according to claim 18, characterized in that, Each of the prefabricated main connecting piece, auxiliary connecting piece of the suction surface, main connecting piece of the pressure surface and auxiliary connecting piece of the pressure surface is divided into a connecting section, a fixing section and a transition section which are connected to each other, wherein the connecting section protrudes from the end surface of the first surface; The transition section is connected to the corresponding main beam or auxiliary beam; The thickness of the main beam of the pressure surface and the main beam of the suction surface gradually becomes thinner at one end close to the corresponding transition section; The thickness of the auxiliary beam of the pressure surface and the auxiliary beam of the suction surface gradually becomes thinner at one end close to the corresponding transition section; A transition zone fiber cloth layer is laid between the inner surface of the first surface or the third surface and the transition section and the main beam or auxiliary beam, so that the transition zone, the main beam or auxiliary beam and the connecting piece are on the same horizontal plane.

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