CN114562411A

CN114562411A - Sectional type fan blade connecting structure, sectional type fan blade and manufacturing method

Info

Publication number: CN114562411A
Application number: CN202210167935.3A
Authority: CN
Inventors: 左刘洋; 路旭恒; 齐志攀; 王晨伟; 白宏伟; 王国军
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-05-31

Abstract

The invention discloses a sectional type fan blade connecting structure, a sectional type fan blade and a preparation method, wherein the connecting structure comprises the following components: the first end of the first connecting piece is arranged at one end of the first blade section, and the second end of the first connecting piece protrudes out of the end part of the first blade section; a socket cavity is formed in the end part of the second end of the first connecting piece; a second connector, a second end of the second connector being arranged at one end of the second blade segment, a first end of the second connector protruding the end of the second blade segment; the first end of the second connecting piece is matched with the socket cavity of the first connecting piece, the first end of the second connecting piece is inserted into the socket cavity to form a connecting part, and the connecting part penetrates through the connecting part sequentially along the chord direction through a fastener to be fixedly connected with the first connecting piece and the second connecting piece. The invention has the advantages of more reliable connection of the sectional blades, light additional weight of the sectional position and convenience for factory production and field operation of wind farms.

Description

Sectional type fan blade connecting structure, sectional type fan blade and manufacturing method

Technical Field

The invention relates to the field of fan blade manufacturing, in particular to a sectional type fan blade connecting structure, a sectional type fan blade and a manufacturing method.

Background

The wind power blade is used as a core component of the wind power unit, and the size of the blade is gradually increased along with the increase of the capacity of the unit. From the point of view of manufacturing by molding, there are many technical bottlenecks in the production of large blades: on the one hand, the large-scale manufacture of the blades brings great difficulty, the increase of the sizes of the blades causes the increase of loads and stresses at the blade roots, therefore, structural reinforcement is needed in the blade production laying process, the required glass fiber laying layer is too thick due to the overlarge size of the blades, the existing resin pouring process is difficult to completely pour, the structural laying layer is thicker, the pouring difficulty is higher, and the space requirement of a factory building is increased.

Therefore, the prior art attempts to further manufacture larger blades have great difficulties in the process. On the other hand, the installation and transportation of large blades are faced with many problems, and as the size of the blades increases, the transportation and installation of the blades are faced with many difficulties, such as the limitation from roads and transportation tools, and even if qualified blades can be produced, the transportation is difficult to realize; in addition, the size of the blade is increased, so that great challenges are brought to the installation of the blades of the wind field, the large blade has poor capability of resisting extreme weather in the wind field, the aerodynamic load on the extreme weather is large, and the safety and reliability problems are severe. Therefore, with the development of large-capacity units, large blades matched with the units are required to be produced, and sectional manufacturing, transportation and installation of the blades are a necessary way for the technical development of the blades.

In the prior art, the connection modes of the sectional blades mainly include three types:

1. and (4) bonding, namely matching the two connected segmented blades in the main beam area, and then bonding in the connection area.

2. And (3) connecting the two blades through bolts, embedding a bolt sleeve on one side of each blade, installing a bolt, and then installing a nut on the other side of each blade and fastening.

3. The pipe is inserted into the rod to be matched with the rod to connect the two sections of the sectional blade, a tubular structure is fixed in one section of the sectional blade, a rod-shaped structure is fixed in the other section of the sectional blade, the rod-shaped structure is inserted into the tubular structure and is poured with viscous substances to fix the rod-shaped structure, and therefore the two sections are connected.

Three connection modes of the sectional blades in the prior art have respective problems. Firstly, for the bonding scheme, the bonding strength is difficult to meet the requirement, and the connection failure is easy to cause; secondly, for the bolt connection scheme, the weight increase of the bolt connection mode at the connection position is large, the safety and the economy of the blade are affected, and the bolt pretightening force needs to be maintained frequently; finally, for the scheme of matching the pipe and the rod, the round pipe and the rod are difficult to be tight, the drawing force of the structure is influenced, the field pouring process is complex, and the curing effect is poor.

Therefore, the existing sectional fan blade has the following three problems, so that the sectional fan blade is difficult to realize practical popularization and use, and firstly, the connection scheme is complex, the reliability is poor, the cost is high, the pneumatic efficiency can be reduced, and the like. And secondly, the additional mass introduced by the connecting structure at the segment brings adverse effects on the blade root load and the corresponding variable pitch bearing, and the implementation of the segmentation scheme is poor. Thirdly, when the bolt fastening operation of the connecting structure at the subsection position, the operation space is small, the installation is difficult, the later maintenance is difficult, and the maintenance cost is high.

These problems are all important reasons limiting the practical use of segmentation techniques. Therefore, there is a need to provide a connection method for fan sectional blades, which can solve the above three problems.

Disclosure of Invention

The invention aims to provide a sectional type fan blade connecting structure, a sectional type fan blade and a preparation method, so that the connection of the sectional type fan blade is more reliable, the additional weight of the sectional position is light, and the factory production and the field operation of a wind field are facilitated.

In order to achieve the above purpose, the invention is realized by the following technical scheme:

a segmented fan blade connection structure for connection between adjacent first and second blade segments, the connection structure comprising: a first connector, a first end of the first connector being disposed at one end of the first blade section, a second end of the first connector protruding beyond one end of the first blade section; and a socket cavity is formed in the end part of the second end of the first connecting piece. A second connector, a second end of the second connector being disposed at one end of the second blade segment, a first end of the second connector protruding beyond one end of the second blade segment. The first end of the second connecting piece is matched with the socket cavity of the first connecting piece, the first end of the second connecting piece is inserted into the socket cavity to form a connecting part, and penetrates through the connecting part in sequence along the chord direction through a fastener to be fixedly connected with the first connecting piece and the second connecting piece.

Optionally, the first connecting piece comprises a first main connecting piece and a first auxiliary connecting piece which extend in the same direction; the first main connecting piece is coaxially arranged with a first main beam in the first blade section, and the first auxiliary connecting piece is coaxially arranged with a first auxiliary beam in the first blade section; the second connecting piece comprises a second main connecting piece and a second auxiliary connecting piece which extend in the same direction.

The second main connecting piece is coaxially arranged with a second main beam in the second blade section, and the second auxiliary connecting piece is coaxially arranged with a second auxiliary beam in the second blade section. The first main connecting piece and the second main connecting piece are oppositely arranged; and a first socket cavity is formed in one end, close to the second main connecting piece, of the first main connecting piece, and one end of the second main connecting piece is inserted into the first socket cavity. The first auxiliary connecting piece and the second auxiliary connecting piece are arranged oppositely, a second socket cavity is formed in one end, close to the second auxiliary connecting piece, of the first auxiliary connecting piece, and one end of the second auxiliary connecting piece is inserted into the second socket cavity.

Optionally, the first primary connecting element comprises a first pressure surface primary connecting element and a first suction surface primary connecting element which extend in the same direction. The first auxiliary connecting piece comprises a first pressure surface auxiliary connecting piece and a first suction surface auxiliary connecting piece which have the same extending direction. The first pressure surface main connecting piece and the first pressure surface auxiliary connecting piece are arranged close to the pressure surface of the first blade section. The first suction surface main connecting piece and the first suction surface auxiliary connecting piece are arranged close to the suction surface of the first blade section. The first main beam in the first blade section comprises: a first pressure side main beam and a first suction side main beam. The first secondary beam in the first blade section comprises: the first pressure surface auxiliary beam and the first suction surface auxiliary beam. The first pressure surface main connecting piece is coaxially connected with the first pressure surface main beam. The first suction surface main connecting piece is coaxially connected with the first suction surface main beam. The first pressure surface auxiliary connecting piece is coaxially connected with the first pressure surface auxiliary beam. The first suction surface auxiliary connecting piece is coaxially connected with the first suction surface auxiliary beam. The second main connecting piece comprises a second pressure surface main connecting piece and a second suction surface main connecting piece which have the same extending direction. The second auxiliary connecting piece comprises a second pressure surface auxiliary connecting piece and a second suction surface auxiliary connecting piece which have the same extending direction. The second pressure side primary and secondary pressure side connectors are disposed proximate to the pressure side 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 section. The second main beam in the second blade section comprises: a second pressure side main beam and a second suction side main beam. The second auxiliary beam in the second blade segment comprises: the second pressure surface auxiliary beam and the 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; and the second suction surface auxiliary connecting piece is coaxially connected with the second suction surface auxiliary beam.

Optionally, the first connecting piece includes a first connecting section, a first fixing section and a first transition section connected in sequence; the thickness of the first transition section is sequentially reduced along the direction far away from the first fixing section; the thickness of the joint of the first transition section and the first fixed section is the same as that of the first fixed section; the socket cavity is formed in one end, far away from the first fixing section, of the first connecting section; the second connecting piece comprises a second connecting section, a second fixing section and a second transition section which are connected in sequence; the thickness of the second transition section is sequentially reduced along the direction far away from the second fixed section; the thickness of the joint of the second transition section and the second fixed section is the same as that of the second fixed section; one end of the second connecting section, which is far away from the second fixing section, is provided with a bolt chamfer; the second connecting section is inserted into the socket cavity.

Optionally, a first chamfer is arranged at the end part, far away from the first fixing section, of the first transition section, and the ratio of the thickness of the first transition section to the length of the first transition section is 1: 50-1: 100; a second chamfer is arranged at the end part, far away from the second fixed section, of the second transition section, and the ratio of the thickness of the second transition section to the length of the second transition section is 1: 50-1: 100; the bolt chamfer is the thickness of the second connecting section and the length ratio of the second connecting section to the bolt chamfer is 1: 5-1: 10.

Optionally, the first main connecting piece includes a first main connecting section, a first main fixing section, and a first main transition section, which are connected in sequence; the thickness of the first main transition section is reduced in sequence along the direction far away from the first main fixing section. The thickness of the joint of the first main transition section and the first main fixing section is the same as that of the first main fixing section. One end of the first main connecting section, which is far away from the first main fixing section, is provided with the first socket cavity; the first auxiliary connecting piece comprises a first auxiliary connecting section, a first auxiliary fixing section and a first auxiliary transition section which are sequentially connected. The thickness of the first auxiliary transition section is reduced in sequence along the direction away from the first auxiliary fixing section.

The thickness of the joint of the first auxiliary transition section and the first auxiliary fixing section is the same as that of the first auxiliary fixing section. The end of the first auxiliary connecting section, which is far away from the first auxiliary fixing section, is provided with the second socket cavity; the second main connecting piece comprises a second main connecting section, a second main fixing section and a second main transition section which are sequentially connected; the thickness of the second main transition section is reduced in sequence along the direction far away from the second main fixing section. The thickness of the joint of the second main transition section and the second main fixing section is the same as that of the second main fixing section. A first bolt chamfer is arranged at one end, far away from the second main fixing section, of the second main connecting section; the second main connecting section is inserted into the first socket cavity. The second auxiliary connecting piece comprises a second auxiliary connecting section, a second auxiliary fixing section and a second auxiliary transition section which are sequentially connected. The thickness of the second auxiliary transition section is sequentially reduced along the direction far away from the second auxiliary fixing section; the thickness of the joint of the second auxiliary transition section and the second auxiliary fixing section is the same as that of the second auxiliary fixing section. A second bolt chamfer is arranged at one end, far away from the second auxiliary fixing section, of the second auxiliary connecting section; the second auxiliary connecting section is inserted into the second socket cavity.

Optionally, a first main chamfer is arranged at an end part, close to the first main beam, of the first main transition section, and the ratio of the thickness of the first main transition section to the length of the first main transition section is 1: 50-1: 100. And a second auxiliary chamfer is arranged at the end part, close to the first auxiliary beam, of the first auxiliary transition section, and the ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section is 1: 50-1: 100. A second main chamfer is arranged at the end part, close to the second main beam, of the second main transition section, and the ratio of the thickness of the first main transition section to the length of the first main transition section is 1: 50-1: 100; and a second auxiliary chamfer is arranged at the end part of the second auxiliary transition section, which is close to the second auxiliary beam, and the ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section is 1: 50-1: 100. The first bolt chamfer is the thickness of the second main connecting section and the length ratio of the thickness to the length of the second main connecting section is 1: 5-1: 10. The second bolt chamfer is the ratio of the thickness of the second auxiliary connecting section to the length of the second auxiliary connecting section of 1: 5-1: 10.

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 connecting section is inserted into the first socket cavity, the first connecting hole and the third connecting hole are matched and are opposite, and a first fastener sequentially penetrates through the first connecting hole and the third connecting hole 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 connecting hole and the fourth connecting hole are matched and are right opposite, and a second fastening piece sequentially penetrates through the second connecting hole and the fourth connecting hole to fix the second socket cavity and the second auxiliary connecting section.

Optionally, the first connecting holes, the second connecting holes, the third connecting holes and the fourth connecting holes are arranged in a plurality of rows and columns, wherein the extending direction of the columns is consistent with the extending direction of the first socket cavity, the second main connecting section and the second auxiliary connecting section.

Optionally, the first connecting hole, the second connecting hole, the third connecting hole and the fourth connecting hole are all countersunk holes, and the first fastener and the second fastener are both countersunk head studs, blind rivets or high-locking bolts.

Optionally, a row distance between two adjacent rows of connecting holes in the first connecting hole, the second connecting hole, the third connecting hole and the fourth connecting hole is greater than or equal to four times of the diameter of the connecting hole, and a distance between two adjacent connecting holes in the same row is greater than or equal to five times of the diameter of the connecting hole.

Optionally, the device 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 surface, and the suction wing plate is arranged on the connecting portion and located on the suction surface. The pressure and suction airfoils cap each other and are conformal with the first and second blade segments.

Optionally, the connecting structure is made of any one of the following materials: carrying out vacuum bag pressing or compression molding on the carbon fiber/epoxy resin prepreg composite material; adopting glass fiber, aramid fiber, epoxy resin and phenolic resin prepreg to form a composite material; the composite material is prepared by infusing carbon fiber, glass fiber, aramid fiber, epoxy resin, phenolic resin and polyurethane resin.

Optionally, the first connecting member and the second connecting member are both prefabricated members, and are respectively integrally cast with the first blade segment and the second blade segment.

In another aspect, the present invention further provides a sectional fan blade, which includes at least two blade sections, and two adjacent blade sections are connected by using the above-mentioned sectional fan blade connection structure.

In another aspect, the present invention further provides a method for preparing a blade segment in a segmented fan blade, including: a blade section mould, wherein an outer structural cloth layer is laid on the blade section mould; arranging a prefabricated first connecting piece or a prefabricated second connecting piece in the blade section mould; a blade section beam is arranged in the blade section mould and is coaxially arranged with the first connecting piece or the second connecting piece; arranging a core material at the inner surface of the blade segment mould to fix the first connecting piece or the second connecting piece; laying an inner structural cloth layer in the blade section mould; 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 section beam; pouring, curing and molding the blade section mold to obtain a pre-molded segmented blade section half shell; and respectively arranging a front edge web plate and a rear edge web plate at the front edge and the rear edge in the blade section mould, and closing the mould to obtain the blade section.

Optionally, the step of laying an outer structural cloth layer on the blade segment mould comprises: and respectively paving a first outer structure cloth layer and a second outer structure cloth layer on the pressure surface and the suction surface of the blade section mould. The step of providing a prefabricated first or second connector within the blade segment mould comprises: placing and fixing a prefabricated suction surface main connecting piece and a prefabricated suction surface auxiliary connecting piece close to a suction surface in the blade section mold; and placing and fixing the prefabricated pressure surface main connecting piece and the pressure surface auxiliary connecting piece close to the pressure surface in the blade section mould. The step of providing a core material at an inner surface of the blade segment mould to fix the first or second connector comprises: arranging a first suction surface core material between the suction surface main connecting piece and the front edge of the blade segment mould in the blade segment mould; a second suction surface core material is arranged between the suction surface main connecting piece and the suction surface auxiliary connecting piece; a third suction surface core material is arranged between the suction surface auxiliary connecting piece and the rear edge of the blade section mould; arranging a first pressure surface core material between the pressure surface main connecting piece and the front edge of the blade section mould in the blade section mould; a second pressure surface core material is arranged between the pressure surface main connecting piece and the pressure surface auxiliary connecting piece; and a third pressure surface core material is arranged between the pressure surface auxiliary connecting piece and the rear edge of the blade section mould. The blade section mould is internally provided with a blade section beam, and the step of coaxially arranging the blade section beam and the first connecting piece or the second connecting piece comprises the following steps: placing and fixing a pressure surface main beam and a pressure surface auxiliary beam close to a pressure surface in the blade section mould; the pressure surface main beam and the pressure surface main connecting piece are coaxially arranged; the pressure surface auxiliary beam and the pressure surface auxiliary connecting piece are coaxially arranged; placing and fixing a suction surface main beam and a suction surface auxiliary beam close to a suction surface in the blade section mould; the suction surface main beam and the suction surface main connecting piece are coaxially arranged, and the suction surface auxiliary beam and the suction surface auxiliary connecting piece are coaxially arranged. Laying an inner structural cloth layer in the blade section mould; 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 section beam comprises the following steps: respectively paving a first inner structure cloth layer and a second inner structure cloth layer in the blade section mould; the first inner structure cloth layer and the first outer structure cloth layer are combined to wrap a pressure surface main connecting piece, a pressure surface auxiliary connecting piece, a pressure surface main beam and a pressure surface auxiliary beam which are close to a pressure surface; the second inner structure cloth layer and the second outer structure cloth layer are combined to wrap a suction surface main connecting piece, a suction surface auxiliary connecting piece, a suction surface main beam and a suction surface auxiliary beam which are close to a suction surface; pouring, curing and molding the blade section mold to obtain a pre-molded segmented blade section half shell; and respectively arranging a front edge web plate and a rear edge web plate at the front edge and the rear edge in the blade section mould so as to connect the suction surface and the pressure surface, and closing the mould to obtain the blade section.

Optionally, the method further comprises: the first outer structure layer comprises a first skin and first outer fixing cloth, the first skin is paved to form a second molded surface of the suction surface, and the first outer fixing cloth is paved below the second molded surface to form a first molded surface of the suction surface; the second outer structure layer comprises a second skin and second outer fixing cloth, the second skin is paved to form a fourth molded surface of the pressure surface, and the second outer fixing cloth is paved below the fourth molded surface to form a third molded surface of the pressure surface; the thickness of the first molded surface is gradually reduced or increased layer by layer along the length direction, and the first molded surface covers a chamfer area of the main beam or the auxiliary beam of the suction surface; (ii) a The thickness of the third molded surface is gradually decreased or increased layer by layer along the length direction, and the third molded surface covers the chamfer area of the pressure surface main beam or the pressure surface auxiliary beam.

Optionally, each of the prefabricated suction surface main connecting piece, the suction surface auxiliary connecting piece, the pressure surface main connecting piece and the pressure surface auxiliary connecting piece is divided into a connecting section, a fixing section and a transition section which are connected with each other, wherein the connecting section protrudes out of the end face of the first molded surface; the transition section is connected with the corresponding main beam or auxiliary beam; the thickness of the pressure surface main beam and the suction surface main beam is gradually reduced at one end close to the corresponding transition section; and the thicknesses of the pressure surface auxiliary beam and the suction surface auxiliary beam close to the corresponding transition sections are gradually reduced. And laying a transition area fiber cloth layer between the inner surface of the first profile or the third profile and the transition section and the main beam or the auxiliary beam, so that the transition area and the main beam or the auxiliary beam and the connecting piece are in the same horizontal plane.

The invention has at least one of the following advantages:

the sectional type fan blade connecting structure provided by the invention has the advantages that the connection of the sectional blades is more reliable, the additional weight of the sectional position is light, and the factory production and the wind field operation are facilitated. The first connecting piece and the second connecting piece are both prefabricated pieces and are respectively integrally poured and formed with the first blade section and the second blade section. The connecting structure provided by the invention can prevent the stress concentration of the sectional blade connecting area and improve the connection reliability by arranging the first chamfer angle, the second chamfer angle (transition section) and the main fixing section. Through adopting carbon fiber/epoxy preimpregnation material vacuum bag to press or compression molding's combined material preparation connection structure can reduce the fashioned degree of difficulty of connection structure, reduces the shaping risk, can reduce the weight of segmentation blade connecting part by a wide margin simultaneously.

The assembling difficulty of the blade joint can be reduced by arranging the bolt chamfers, and the assembling efficiency is improved. The prefabricated carbon fiber epoxy resin reinforced composite material connecting pieces are embedded into the two ends of the segmented blade in a pre-embedded mode, the requirement of large blade production on site space can be reduced, meanwhile, mass production of the two segments of the blade in different places can be achieved, the blade forming efficiency is improved, the blade transportation cost is reduced, and the like. The connecting structure provided by the invention has the advantages of simple structure, low cost, safety, reliability and strong implementability.

Drawings

Fig. 1 is a main structural schematic diagram of a connection structure of a sectional type fan blade according to an embodiment of the present invention;

fig. 2 is a schematic top view of a connection structure of a sectional type fan blade according to an embodiment of the present invention;

fig. 3 is a schematic perspective main structural diagram of a sectional fan blade according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a connection structure of a sectional fan blade along the direction W in FIG. 1 according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a first connecting member in a connecting structure of a sectional type fan blade according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a second connection member in a connection structure of a sectional type fan blade according to an embodiment of the present invention.

Detailed Description

The present invention provides a sectional type fan blade connection structure, a sectional type fan blade and a manufacturing method thereof, which are further described in detail below with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.

As shown in fig. 1, the present embodiment provides a sectional type fan blade connection structure for connection between adjacent first and

second blade sections

1 and 2, the connection structure including: a first connecting piece, wherein a first end of the first connecting piece is arranged at one end of the first blade section 1, and a second end of the first connecting piece protrudes out of one end of the first blade section 1; a socket cavity is formed in the end part of the second end of the first connecting piece; a second connector, a second end of which is arranged at one end of the second blade segment 2, a first end of which protrudes beyond one end of the second blade segment 2; the first end of the second connecting piece is matched with the socket cavity of the first connecting piece, the first end of the second connecting piece is inserted into the socket cavity to form a connecting part, and penetrates through the connecting part in sequence along the chord direction through a fastener to be fixedly connected with the first connecting piece and the second connecting piece.

In this embodiment, the first connecting piece includes a first connecting section, a first fixing section and a first transition section, which are connected in sequence; the thickness of the first transition section is sequentially reduced along the direction far away from the first fixing section; the thickness of the joint of the first transition section and the first fixed section is the same as that of the first fixed section; the socket cavity is formed in one end, far away from the first fixing section, of the first connecting section; the second connecting piece comprises a second connecting section, a second fixing section and a second transition section which are connected in sequence; the thickness of the second transition section is sequentially reduced along the direction far away from the second fixed section; the thickness of the joint of the second transition section and the second fixed section is the same as that of the second fixed section; one end of the second connecting section, which is far away from the second fixing section, is provided with a bolt chamfer; the second connecting section is inserted into the socket cavity.

A first chamfer is arranged at the end part, far away from the first fixed section, of the first transition section, and the ratio of the thickness of the first transition section to the length of the first transition section is 1: 50-1: 100; a second chamfer is arranged at the end part, far away from the second fixed section, of the second transition section, and the ratio of the thickness of the second transition section to the length of the second transition section is 1: 50-1: 100; the bolt chamfer is the thickness of the second connecting section and the length ratio of the second connecting section to the bolt chamfer is 1: 5-1: 10.

As shown in fig. 1 to 3, in the present embodiment, the first connecting member includes a first main connecting member 501 and a first auxiliary connecting member 401 extending in the same direction.

Specifically, in this embodiment, the first main connecting member 501 includes two members: for convenience of description, the nomenclature is: the first suction surface main connecting piece and the first pressure surface main connecting piece have the same extending direction.

The first subsidiary connecting member 401 is provided with two: for convenience of description, the nomenclature is: the extension directions of the first suction surface auxiliary connecting piece and the first pressure surface auxiliary connecting piece are the same.

The first pressure surface main connecting piece and the first pressure surface auxiliary connecting piece are arranged close to the pressure surface of the first blade section 1.

The first suction surface main connecting piece and the first suction surface auxiliary connecting piece are arranged close to the suction surface of the first blade section 1.

The first main connection 501 is arranged coaxially with the first main beam 311 in the first blade section 1, and the first auxiliary connection 401 is arranged coaxially with the first auxiliary beam 312 in the first blade section 1.

Specifically, in this embodiment, two first main beams 311 in the first blade section 1 are provided, and for convenience of distinction, the two main beams are described as follows: the first pressure surface main beam and the first suction surface main beam are respectively positioned on the pressure surface and the suction surface.

The first auxiliary beam 312 in the first blade section 1 is provided with two beams, which are described as: the first pressure surface auxiliary beam and the first suction surface auxiliary beam are respectively positioned on the pressure surface and the suction surface.

The first pressure surface main connecting piece and the first pressure surface main beam are coaxially arranged.

The first suction surface main connecting piece and the first suction surface main beam are coaxially arranged.

The first pressure surface auxiliary connecting piece and the first pressure surface auxiliary beam are coaxially arranged.

The first suction surface auxiliary connecting piece and the first suction surface auxiliary beam are coaxially arranged.

With continued reference to fig. 1 and 2, the second connector includes a second main connector 502 and a second auxiliary connector 402 extending in the same direction.

Specifically, in this embodiment, there are two second main connecting members 502, which are named as follows for convenience of description: the extension directions of the second pressure surface main connecting piece and the second suction surface main connecting piece are the same.

The second subsidiary connecting members 402 are provided in two, named as follows for convenience of description: the extension directions of the second pressure surface auxiliary connecting piece and the second suction surface auxiliary connecting piece are the same.

The second pressure side main connection and the second pressure side auxiliary connection are arranged close to the pressure side of the second blade section 2.

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 section 2.

With continued reference to fig. 1 and fig. 2, in the present embodiment, the second main connecting member 502 is coaxially disposed with the second main beam 301 in the second blade segment 2, and the second auxiliary connecting member 402 is coaxially disposed with the second auxiliary beam 302 in the second blade segment 2.

Specifically, the second main beam 301 in the second blade segment 2 is provided with two of: a second pressure side main beam and a second suction side main beam.

The second auxiliary beam 302 in the second blade section 2 is provided with two of: the second pressure surface auxiliary beam and the second suction surface auxiliary beam.

The second pressure surface main connecting piece and the second pressure surface main beam are coaxially arranged.

The second suction surface main connecting piece and the second suction surface main beam are coaxially arranged.

The second pressure surface auxiliary connecting piece and the second pressure surface auxiliary beam are coaxially arranged.

The second suction surface auxiliary connecting piece and the second suction surface auxiliary beam are coaxially arranged.

The first main connecting piece 501 and the second main connecting piece 502 are arranged oppositely; a first socket cavity is formed at one end of the first main connecting piece 501 close to the second main connecting piece 502, and one end of the second main connecting piece 502 is inserted into the first socket cavity. The first auxiliary connecting piece 401 and the second auxiliary connecting piece 402 are arranged oppositely, a second socket cavity is arranged at one end of the first auxiliary connecting piece 401 close to the second auxiliary connecting piece 402, and one end of the second auxiliary connecting piece 402 is inserted into the second socket cavity.

As shown in fig. 1 and 5, the first main connector 501 and the first auxiliary connector 401 are similar in overall structure, and have slightly different widths only in the direction along W, so that the two structures can be seen from fig. 5 at the same time, wherein the first main connector 501 comprises a first main connecting section 5011, a first main fixing section 5012 and a first main transition section 5013 which are connected in sequence; the thickness of the first primary transition segment 5013 decreases in sequence in a direction away from the first primary fixed segment 5012.

The thickness of the junction of the first primary transition segment 5013 and the first primary fixed segment 5012 is the same as the thickness of the first primary fixed segment 5012.

The first socket cavity 5014 is formed in one end of the first main connecting section 5011 far away from the first main fixing section 5012.

The first auxiliary connecting piece comprises a first auxiliary connecting section, a first auxiliary fixing section and a first auxiliary transition section which are sequentially connected. The thickness of the first auxiliary transition section is reduced in sequence along the direction away from the first auxiliary fixing section. The thickness of the joint of the first auxiliary transition section and the first auxiliary fixing section is the same as that of the first auxiliary fixing section. And one end of the first auxiliary connecting section, which is far away from the first auxiliary fixing section, is provided with the second socket cavity.

As shown in fig. 1 and 6, the second main connector 502 and the second auxiliary connector 402 are similar in overall structure, and have different widths only in the direction W, so that the two structures can be seen in fig. 6, and the second main connector 502 includes a second main connecting section 5021, a second main fixing section 5022 and a second main transition section 5023 which are connected in sequence; the thickness of the second main transition section 5023 decreases in sequence in a direction away from the second main fixing section 5022.

The thickness of the junction of the second main transition section 5023 and the second main stationary section 5022 is the same as the thickness of the second main stationary section 5022.

A first bolt chamfer 5024 is arranged at one end of the second main connecting section 5021 far away from the second main fixing section 5022; the thickness of the second main connecting section 5021 is smaller than that of the second main fixing section 5022, and the second main connecting section 5021 is matched with the first socket cavity 5014.

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, higher than the second main connecting section 5021, of the second main fixing section 5022, and the two are aligned with each other.

The second auxiliary connecting member 402 includes a second auxiliary connecting section, a second auxiliary fixing section, and a second auxiliary transition section, which are connected in sequence. The thickness of the second auxiliary transition section is reduced along the direction far away from the second auxiliary fixing section; the thickness of the joint of the second auxiliary transition section and the second auxiliary fixing section is the same as that of the second auxiliary fixing section. A second bolt chamfer is arranged at one end, far away from the second auxiliary fixing section, of the second auxiliary connecting section; the second auxiliary connecting section is inserted into the second socket cavity.

The end, close to the first main beam 311, of the first main transition section 5013 is provided with a first main chamfer, and the ratio of the thickness of the first main transition section 5013 to the length of the first main transition section 5013 is 1: 50-1: 100.

And a second auxiliary chamfer is arranged at the end part of the first auxiliary transition section, which is close to the first auxiliary beam 312, and the ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section is 1: 50-1: 100.

A second main chamfer is arranged at the end part, close to the second main beam, of the second main transition section, and the ratio of the thickness of the first main transition section to the length of the first main transition section is 1: 50-1: 100;

and a second auxiliary chamfer is arranged at the end part of the second auxiliary transition section, which is close to the second auxiliary beam, and the ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section is 1: 50-1: 100.

The first bolt chamfer 5024 is the thickness of the second main connecting section 5021 and the length ratio of the thickness to the length of the second main connecting section 5021 is 1: 5-1: 10. The second bolt chamfer is the ratio of the thickness of the second auxiliary connecting section to the length of the second auxiliary connecting section of 1: 5-1: 10.

With continued reference to fig. 1, 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 connection segment 5021 is provided with a third connection hole 902, and the second auxiliary connection segment is provided with a fourth connection hole.

After the second main connection segment 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 a first fastener sequentially penetrates through the first connection hole 901 and the third connection hole 902 to fix the first socket cavity 5014 and the second main connection segment 5021.

After the second auxiliary connecting section is inserted into the second socket cavity, the second connecting hole and the fourth connecting hole are matched and are right opposite, and a second fastening piece sequentially penetrates through the second connecting hole and the fourth connecting hole to fix the second socket cavity and the second auxiliary connecting section. Thereby achieving the connection of the two leaf segments.

With continued reference to fig. 1, the first connecting holes 901, the second connecting holes, the third connecting holes 902, and the fourth connecting holes are arranged in a plurality of rows and columns, wherein the extending direction of the columns is the same as the extending direction of the first socket cavity 5014, the second socket cavity, the second main connecting segment 5021, and the second auxiliary connecting segment.

In this embodiment, the number of rows of the connection holes is preferably 3 or more.

In this embodiment, the first connecting hole 901, the second connecting hole, the third connecting hole 902, and the fourth connecting hole are all countersunk holes, and the first fastener and the second fastener are both a countersunk stud, a blind rivet, or a high-lock bolt.

In this embodiment, a row distance between two adjacent rows of connection holes in 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 of the diameter of the connection hole, and a distance between two adjacent connection holes in the same row is greater than or equal to five times of the diameter of the connection hole.

With continued reference to fig. 1 and 2, in the present embodiment, the connecting structure further includes two wing-shaped cover plates 6, which are described as follows for the sake of distinction: the pressure wing plate is arranged on the connecting portion and located on a pressure surface, and the suction wing plate is arranged on the connecting portion and located on a suction surface.

The pressure and suction aerofoil plates are mutually shrouded and conformal to the first and

second blade sections

1, 2.

In this embodiment, the connection structure is made of any one of the following materials: carrying out vacuum bag pressing or compression molding on the carbon fiber/epoxy resin prepreg composite material; adopting glass fiber, aramid fiber, epoxy resin and phenolic resin prepreg to form a composite material; the composite material is prepared by infusing carbon fiber, glass fiber, aramid fiber, epoxy resin, phenolic resin and polyurethane resin. Specifically, one or more of the fiber materials may be optionally selected and mixed, and only one of the resin materials may be optionally selected.

In this embodiment, the first connecting member and the second connecting member are both prefabricated members, and are respectively integrally cast with the first blade segment and the second blade segment. The connecting structure has the following beneficial effects: 1) the first chamfer angle, the second chamfer angle (transition section) and the main fixing section are arranged, so that the stress concentration of the sectional blade connecting area can be prevented, and the connecting reliability is improved; 2) the composite material formed by pressing or compression molding the carbon fiber/epoxy resin prepreg in the vacuum bag can reduce the forming difficulty of the connecting structure, reduce the forming risk and greatly reduce the weight of the segmented blade connecting part; 3) the assembly difficulty of the blade joint can be reduced by arranging the bolt chamfer, and the assembly efficiency is improved; 4) the prefabricated carbon fiber epoxy resin reinforced composite connecting pieces are embedded into the two ends of the segmented blade, so that the requirement of large blade production on site space can be reduced, meanwhile, the mass production of the two segments of the blade in different places can be realized, the blade forming efficiency is improved, the blade transportation cost is reduced and the like; 5) the connecting structure is simple, the cost is low, the safety and the reliability are realized, and the practicability is strong.

On the other hand, the present embodiment further provides a sectional fan blade, which includes at least two blade segments, and the two adjacent blade segments are connected by using the sectional fan blade connection structure as described above.

Referring to fig. 1 to fig. 6, in another aspect, a method for manufacturing a blade segment in a sectional type fan blade is further provided, including: step S1, providing a blade segment mold, where the blade segment mold may be a first blade segment mold and a second blade segment mold, and the blade segment molds are located on the same plane in the connection area.

And step S2, laying an outer structural cloth layer on the blade segment mould.

And step S3, arranging a prefabricated first connecting piece or a prefabricated second connecting piece in the blade section mould.

And step S4, arranging a blade section beam in the blade section mould, and arranging the blade section beam and the first connecting piece or the second connecting piece coaxially.

Step S5, providing a core material at the inner surface of the blade segment mold to fix the first connector or the second connector.

Step S6, laying an inner structure cloth layer in the blade section mould; 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 section beam.

And step S7, performing pouring, curing and molding in the blade section mold to obtain a pre-molded segmented blade section half shell.

And step S8, respectively arranging a front edge web plate and a rear edge web plate at the front edge and the rear edge in the blade segment mould, and closing the mould to obtain the blade segment.

The step S2 includes: preparing a prefabricated sectional type fan blade connecting structure of the embodiment, and respectively 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 section mould. The first outer structure cloth layer is used for forming a suction surface, and the second outer structure cloth layer is used for forming a pressure surface.

The step S3 includes: placing and fixing a prefabricated suction surface main connecting piece and a prefabricated suction surface auxiliary connecting piece close to a suction surface in the blade section mold; and placing and fixing the prefabricated pressure surface main connecting piece and the pressure surface auxiliary connecting piece close to the pressure surface in the blade section mould.

The step S5 includes: providing a first suction side core material 314 within the blade segment mould between the suction side primary connector and the leading edge of the blade segment mould; in the present embodiment, as shown in fig. 4, if the blade segment mold is a first blade segment mold, the suction surface main link here is a first main link (first suction surface main link) 501 located on the suction surface.

A second suction surface core material 315 is arranged between the suction surface main connecting piece and the suction surface auxiliary connecting piece; in the present embodiment, as shown in fig. 4, if the blade segment mold is a first blade segment mold, the suction surface main link here is a first main link (first suction surface main link) 501 located on the suction surface. The suction surface auxiliary connecting piece is a first auxiliary connecting piece (first suction surface auxiliary connecting piece) 401 located on the suction surface.

A third suction surface core material 316 is arranged between the suction surface auxiliary connecting piece and the rear edge of the blade section mould; in this embodiment, if the blade segment mold is a first blade segment mold, the suction surface auxiliary connector is a first auxiliary connector (first suction surface auxiliary connector) 401 located on the suction surface.

A first pressure surface core material 317 is arranged between the pressure surface main connector and the front edge of the blade segment mould in the blade segment mould; in this embodiment, as shown in fig. 4, if the blade segment mold is a first blade segment mold, the pressure surface main connecting element here is a first main connecting element (first pressure surface main connecting element) 501 located on the pressure surface.

The core material is PVC/PET foam or Balsa Balsa wood; the thickness of the second core material (the second pressure surface core material or the second suction surface core material) is the same as that of the prefabricated connecting piece, and a 1:5 chamfer is arranged on one side, away from the prefabricated connecting piece, of the first core material (the first pressure surface core material or the first suction surface core material); the third core material (a third pressure surface core material or a third suction surface core material) has the same thickness as the connecting piece on one side, and is provided with a 1:5 chamfer angle on the other side; the main fixed section of the prefabricated connecting piece is flush with the end face of the outer fixing cloth. First, two, three core material are used for fixed prefabricated connecting piece, prevent that it from sliding along the width direction and leading to first, the unable complete matching of second connecting piece after the shaping, can reduce the prefab use amount simultaneously, reduce connection cost.

A second pressure surface core material 318 is arranged between the pressure surface main connecting piece and the pressure surface auxiliary connecting piece; in this embodiment, as shown in fig. 4, if the blade segment mold is a first blade segment mold, the pressure surface main connecting element here is a first main connecting element (first pressure surface main connecting element) 501 located on the pressure surface. The pressure surface auxiliary connecting piece is a first auxiliary connecting piece (first pressure surface auxiliary connecting piece) 401 positioned on the pressure surface.

A third pressure surface core material 319 is arranged between the pressure surface auxiliary connecting piece and the rear edge of the blade section mould; in this embodiment, if the blade segment mold is a first blade segment mold, the pressure surface auxiliary connector is a first auxiliary connector (a first pressure surface auxiliary connector) 401 located on the pressure surface.

The step S4 includes: placing and fixing a pressure surface main beam and a pressure surface auxiliary beam close to a pressure surface in the blade section mould;

the pressure surface main beam and the pressure surface main connecting piece are coaxially arranged; the pressure surface auxiliary beam and the pressure surface auxiliary connecting piece are coaxially arranged.

Placing and fixing a suction surface main beam and a suction surface auxiliary beam close to a suction surface in the blade section mould; the suction surface main beam and the suction surface main connecting piece are coaxially arranged, and the suction surface auxiliary beam and the suction surface auxiliary connecting piece are coaxially arranged.

The step S6 includes: respectively paving a first inner structure cloth layer and a second inner structure cloth layer in the blade section mould; the first inner structure cloth layer and the first outer structure cloth layer are combined to wrap a pressure surface main connecting piece, a pressure surface auxiliary connecting piece, a pressure surface main beam and a pressure surface auxiliary beam which are close to a pressure surface.

The second inner structure cloth layer and the second outer structure cloth layer are combined to wrap a suction surface main connecting piece, a suction surface auxiliary connecting piece, a suction surface main beam and a suction surface auxiliary beam which are close to a suction surface.

The step S8 includes: and respectively arranging a front edge web plate and a rear edge web plate at the front edge and the rear edge in the blade section mould so as to connect the suction surface and the pressure surface, and closing the mould to obtain the blade section. In this embodiment, an epoxy adhesive is used to bond the webs, i.e., the pressure surface and the suction surface are bonded. Repeating the above process to obtain another leaf segment. And carrying out post-treatment on the obtained first blade segment and second blade segment, coating, and then transporting to a wind field for assembly and connection.

In this embodiment, the method further includes: the first outer structure layer comprises a first skin 10 and a first outer fixing cloth 11, the first skin 10 is laid on a second profile 703 forming a suction surface, and the first outer fixing cloth 11 is laid below the second profile 703 to form a first profile 701 of the suction surface; the first profile 701 projects outwardly compared to the second profile 703, the projecting part of which is intended to carry the wing-shaped cover plate 6.

Specifically, the first external fixing cloth 11 is next to the connecting member, starting from the fixing section of the connecting member in the length direction, the first skin 10 is laid on the outermost side, and the starting position of the first skin 10 in the length direction is shorter than the first external fixing cloth 11, so that a thickness difference is formed, that is, the first profile 701 protrudes outward compared with the second profile 703, and the protruding part of the first profile 701 is used for bearing the wing-shaped cover plate 6.

The second outer structure layer structure comprises a second skin 12 and a second outer fixing cloth 13, wherein the second skin 12 is paved to form a fourth molded surface of the pressure surface, and the second outer fixing cloth 13 is paved below the fourth molded surface to form a third molded surface of the pressure surface; the third profile projects outwardly compared to the fourth profile, the projecting part of which is intended to carry the wing-shaped cover plate 6.

In particular, the second outer fixing cloth 13 is located next to the connecting element, starting in the length direction from the fixing section of the connecting element, the second skin 12 is laid on the outermost side, and the starting position of the second skin 12 in the length direction is shorter than the outer fixing cloth 13, thus forming a thickness difference, i.e. the third profile protrudes outwards compared to the fourth profile, the protruding part of which is used for carrying the wing-shaped cover plate 6.

Two

edges

801 and 802 of the aerofoil cover plate 6 extending in the W direction ride on the first profile 701 on the first blade section 1 and the first profile 702 on the second blade section 2, respectively; and the thickness of the two

edges

801 and 802 of the aerofoil cover plate 6 is conformal to the thickness of the second profile 703 on the first blade section and the second profile 704 on the second blade section respectively.

The thickness of the first profile 701 decreases gradually or increases gradually layer by layer along the length direction, and the first profile 701 covers a chamfer area of the main beam or the auxiliary beam of the suction surface.

The thickness of the third molded surface is gradually decreased or increased layer by layer along the length direction, and the third molded surface covers the chamfer area of the pressure surface main beam or the pressure surface auxiliary beam.

In this embodiment, the first inner structural fabric layer comprises a third skin 14 and a first inner fixing cloth 15, and the second inner structural fabric layer comprises a fourth skin 16 and a second inner fixing cloth 17.

The first skin, the second skin, the first outer fixing cloth, the second outer fixing cloth, the first inner fixing cloth and the second inner fixing cloth are made of the same material and can be biaxial woven cloth.

The first external fixing cloth 11 may be laid from the first molded surface 701 along the length direction to the first main beam 311, the length direction decreases progressively (increases) layer by layer, and the width direction is laid along the cross section after the first main beam chamfering area is finished; preferably, 5-15 layers of the first outer fixing cloth or the first inner fixing cloth are paved. The laying method of the second outer fixing cloth is the same as that of the first outer fixing cloth, and is not described in detail herein.

The first internal fixed cloth is biaxial woven cloth, is laid from the first molded surface along the length direction to the first main (auxiliary) beam direction, gradually decreases (increases) layer by layer in the length direction until the main (auxiliary) beam chamfering area is finished, and covers to the edges of the first and third core materials in the width direction; and (4) combining the external fixing cloth, wrapping the connecting piece and the core material, and preferably laying 5-15 layers. The second internal fixing cloth laying method is the same as the first internal fixing cloth, and is not described in detail herein.

In this embodiment, each of the prefabricated suction surface primary, suction surface secondary, pressure surface primary and pressure surface secondary connections is divided equally into a connecting section, a fixing section and a transition section which are connected to each other, wherein the connecting section protrudes beyond the first profile end face, according to the above. The transition section is connected with the corresponding main beam or auxiliary beam; the thickness of the pressure surface main beam and the suction surface main beam is gradually reduced at one end close to the corresponding transition section; namely, a chamfer angle is arranged, and the chamfer angle is 1: 50-1: 100; reducing the stress concentration in the connecting region. The thicknesses of the pressure surface auxiliary beam and the suction surface auxiliary beam close to one end of the corresponding transition section are gradually reduced, namely, chamfers are arranged, and the chamfers are 1: 50-1: 100; reducing the stress concentration in the connecting region.

And laying a transition area fiber cloth layer between the inner surface of the first profile or the third profile and the transition section and the main beam or the auxiliary beam, so that the transition area and the main beam or the auxiliary beam and the connecting piece are in the same horizontal plane.

In the embodiment, the fiber cloth layer in the transition area is preferably single axial glass fiber woven cloth, the layer-by-layer lap joint connecting piece and the main (auxiliary) beam are paved, and the optimal paving layer number is 10-20 layers; after the laying is finished, the transition area, the main beam and the connecting piece are in the same horizontal plane, and meanwhile, the connection stability of the position can be improved.

According to the embodiment, the two ends of the segmented blade are embedded in the prefabricated carbon fiber epoxy resin reinforced composite material connecting piece, the requirement of large blade production on the site space can be reduced, meanwhile, two-section different-place batch production of the blade can be realized, the blade forming efficiency is improved, the blade transportation cost is reduced, and the like. The method of integrally forming the prefabricated connecting piece with the blade main body not only ensures the strength of the shell, but also effectively reduces the weight introduced by the rectifying shell.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the description of the present invention, it is to be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims

1. The utility model provides a sectional type fan blade connection structure for be used for the connection between adjacent first blade segment and the second blade segment, connection structure includes: a first connector, a first end of the first connector being disposed at one end of the first blade section, a second end of the first connector protruding beyond one end of the first blade section; a socket cavity is formed in the end part of the second end of the first connecting piece;

a second connector, a second end of said second connector being disposed at one end of said second blade segment, a first end of said second connector protruding beyond one end of said second blade segment;

the first end of the second connecting piece is matched with the socket cavity of the first connecting piece, the first end of the second connecting piece is inserted into the socket cavity to form a connecting part, and penetrates through the connecting part in sequence along the chord direction through a fastener to be fixedly connected with the first connecting piece and the second connecting piece.

2. The segmented fan blade connection of claim 1,

the first connecting piece comprises a first main connecting piece and a first auxiliary connecting piece which have the same extending direction;

the first main connecting piece is coaxially arranged with a first main beam in the first blade section, and the first auxiliary connecting piece is coaxially arranged with a first auxiliary beam in the first blade section;

the second connecting piece comprises a second main connecting piece and a second auxiliary connecting piece which have the same extending direction;

the second main connecting piece is coaxially arranged with a second main beam in the second blade segment, and the second auxiliary connecting piece is coaxially arranged with a second auxiliary beam in the second blade segment;

the first main connecting piece and the second main connecting piece are oppositely arranged;

one end of the first main connecting piece close to the second main connecting piece is provided with a first socket cavity,

one end of the second main connecting piece is inserted into the first socket cavity;

the first auxiliary connecting piece and the second auxiliary connecting piece are oppositely arranged,

and a second socket cavity is formed at one end of the first auxiliary connecting piece, which is close to the second auxiliary connecting piece.

3. One end of the second auxiliary connecting piece is inserted into the second socket cavity. The segmented fan blade connection of claim 2,

the first main connecting piece comprises a first pressure surface main connecting piece and a first suction surface main connecting piece which have the same extending direction;

the first auxiliary connecting piece comprises a first pressure surface auxiliary connecting piece and a first suction surface auxiliary connecting piece which have the same extending direction;

the first pressure surface main connecting piece and the first pressure surface auxiliary connecting piece are arranged close to the pressure surface of the first blade section;

the first suction surface main connecting piece and the first suction surface auxiliary connecting piece are arranged close to the suction surface of the first blade section;

the first main beam in the first blade section comprises: a first pressure side main beam and a first suction side main beam;

the first auxiliary beam in the first blade section comprises: the auxiliary beam of the first pressure surface and the auxiliary beam of the first suction surface;

the first pressure surface main connecting piece is coaxially connected with the first pressure surface main beam;

the first suction surface main connecting piece is coaxially connected with the first suction surface main beam;

the first pressure surface auxiliary connecting piece is coaxially connected with the first pressure surface auxiliary beam;

the first suction surface auxiliary connecting piece is coaxially connected with the first suction surface auxiliary beam;

the second main connecting piece comprises a second pressure surface main connecting piece and a second suction surface main connecting piece which have the same extending direction;

the second auxiliary connecting piece comprises a second pressure surface auxiliary connecting piece and a second suction surface auxiliary connecting piece which have the same extending direction;

the second pressure side primary and secondary pressure side connectors are disposed proximate to the pressure side 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 section comprises: a second pressure surface main beam and a second suction surface main beam;

the second auxiliary beam in the second blade segment comprises: the second pressure surface auxiliary beam and the 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;

and the second suction surface auxiliary connecting piece is coaxially connected with the second suction surface auxiliary beam.

4. The segmented fan blade connection of claim 1 wherein the first connection comprises a first connection segment, a first stationary segment and a first transition segment connected in series;

the thickness of the first transition section is sequentially reduced along the direction far away from the first fixing section;

the thickness of the joint of the first transition section and the first fixed section is the same as that of the first fixed section;

the socket cavity is formed in one end, far away from the first fixing section, of the first connecting section;

the second connecting piece comprises a second connecting section, a second fixing section and a second transition section which are connected in sequence;

the thickness of the second transition section is sequentially reduced along the direction far away from the second fixed section;

the thickness of the joint of the second transition section and the second fixed section is the same as that of the second fixed section;

one end of the second connecting section, which is far away from the second fixing section, is provided with a bolt chamfer; the second connecting section is inserted into the socket cavity.

5. The segmented fan blade connection of claim 4,

a first chamfer is arranged at the end part, far away from the first fixing section, of the first transition section, and the ratio of the thickness of the first transition section to the length of the first transition section is 1: 50-1: 100;

a second chamfer is arranged at the end part, far away from the second fixed section, of the second transition section, and the ratio of the thickness of the second transition section to the length of the second transition section is 1: 50-1: 100;

the bolt chamfer is the thickness of the second connecting section and the length ratio of the second connecting section to the bolt chamfer is 1: 5-1: 10.

6. The segmented fan blade connection of claim 3 wherein the first primary connection comprises a first primary connection segment, a first primary fixation segment, and a first primary transition segment connected in series; the thickness of the first main transition section is sequentially reduced along the direction far away from the first main fixing section;

the thickness of the joint of the first main transition section and the first main fixing section is the same as that of the first main fixing section;

one end of the first main connecting section, which is far away from the first main fixing section, is provided with the first socket cavity;

the first auxiliary connecting piece comprises a first auxiliary connecting section, a first auxiliary fixing section and a first auxiliary transition section which are connected in sequence;

the thickness of the first auxiliary transition section is sequentially reduced along the direction far away from the first auxiliary fixing section;

the thickness of the joint of the first auxiliary transition section and the first auxiliary fixing section is the same as that of the first auxiliary fixing section;

the end of the first auxiliary connecting section, which is far away from the first auxiliary fixing section, is provided with the second socket cavity;

the second main connecting piece comprises a second main connecting section, a second main fixing section and a second main transition section which are sequentially connected; the thickness of the second main transition section is sequentially reduced along the direction far away from the second main fixing section;

the thickness of the joint of the second main transition section and the second main fixing section is the same as that of the second main fixing section;

a first bolt chamfer is arranged at one end, far away from the second main fixing section, of the second main connecting section; the second main connecting section is inserted into the first socket cavity;

the second auxiliary connecting piece comprises a second auxiliary connecting section, a second auxiliary fixing section and a second auxiliary transition section which are connected in sequence;

the thickness of the second auxiliary transition section is sequentially reduced along the direction far away from the second auxiliary fixing section;

the thickness of the joint of the second auxiliary transition section and the second auxiliary fixing section is the same as that of the second auxiliary fixing section;

a second bolt chamfer is arranged at one end, far away from the second auxiliary fixing section, of the second auxiliary connecting section; the second auxiliary connecting section is inserted into the second socket cavity.

7. The segmented fan blade connection of claim 6,

a first main chamfer is arranged at the end part, close to the first main beam, of the first main transition section, and the ratio of the thickness of the first main transition section to the length of the first main transition section is 1: 50-1: 100;

a first auxiliary chamfer is arranged at the end part, close to the first auxiliary beam, of the first auxiliary transition section, and the ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section is 1: 50-1: 100;

a second auxiliary chamfer is arranged at the end part, close to the second auxiliary beam, of the second auxiliary transition section, and the ratio of the thickness of the first auxiliary transition section to the length of the first auxiliary transition section is 1: 50-1: 100;

the first bolt chamfer is the ratio of the thickness of the second main connecting section to the length of the second main connecting section of 1: 5-1: 10;

the second bolt chamfer is the ratio of the thickness of the second auxiliary connecting section to the length of the second auxiliary connecting section of 1: 5-1: 10.

8. The segmented fan blade connection structure of claim 7, wherein 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 connecting section is inserted into the first socket cavity, the first connecting hole is matched with and faces the third connecting hole, and a first fastener sequentially penetrates through the first connecting hole and the third connecting hole to fix the first socket cavity and the second main connecting section;

9. The segmented fan blade connection of claim 8 wherein the first connection apertures, the second connection apertures, the third connection apertures and the fourth connection apertures are arranged in a plurality of rows and columns, wherein the columns extend in the same direction as the first socket cavity, the second primary connection segment and the second secondary connection segment.

10. The segmented fan blade connection of claim 9,

the first connecting hole, the second connecting hole, the third connecting hole and the fourth connecting hole are all countersunk holes, and the first fastener and the second fastener are both countersunk head studs, blind rivets or high-locking bolts.

11. The segmented fan blade connection of claim 10,

the row distance between every two adjacent rows of connecting holes in the first connecting hole, the second connecting hole, the third connecting hole and the fourth connecting hole is larger than or equal to four times of the diameter of the connecting hole, and the distance between every two adjacent connecting holes in the same row is larger than or equal to five times of the diameter of the connecting hole.

12. The segmented fan blade connection of claim 11 further comprising a pressure airfoil disposed on the connection at a pressure face and a suction airfoil disposed on the connection at a suction face;

the pressure and suction airfoils cap each other and are conformal with the first and second blade segments.

13. The segmented fan blade connection of claim 12 wherein the connection is made from any one of the following materials: carrying out vacuum bag pressing or compression molding on the carbon fiber/epoxy resin prepreg composite material; adopting glass fiber, aramid fiber, epoxy resin and phenolic resin prepreg to form a composite material; the composite material is prepared by infusing carbon fiber, glass fiber, aramid fiber, epoxy resin, phenolic resin and polyurethane resin.

14. The segmented fan blade connection of claim 1,

the first connecting piece and the second connecting piece are prefabricated pieces and are respectively integrally poured and formed with the first blade section and the second blade section.

15. A segmented fan blade comprising at least two blade segments, wherein adjacent blade segments are connected by a segmented fan blade connection according to any of claims 1-14.

16. A method for preparing blade segments in sectional type fan blades is characterized by comprising the following steps: a blade section mould is arranged on the upper surface of the blade section mould,

laying an outer structural cloth layer on the blade section mould;

arranging a prefabricated first connecting piece or a prefabricated second connecting piece in the blade section mould;

a blade section beam is arranged in the blade section mould and is coaxially arranged with the first connecting piece or the second connecting piece;

arranging a core material at the inner surface of the blade segment mould to fix the first connecting piece or the second connecting piece;

laying an inner structural cloth layer in the blade section mould; 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 section beam;

pouring, curing and molding the blade section mold to obtain a pre-molded segmented blade section half shell;

and respectively arranging a front edge web plate and a rear edge web plate at the front edge and the rear edge in the blade section mould, and closing the mould to obtain the blade section.

17. The method of making a blade segment in a segmented fan blade of claim 16, the step of laying an outer structural cloth layer on the blade segment mold comprising: respectively paving a first outer structure cloth layer and a second outer structure cloth layer on the pressure surface and the suction surface of the blade section mould;

the step of providing a prefabricated first or second connector within the blade segment mould comprises:

placing and fixing a prefabricated suction surface main connecting piece and a prefabricated suction surface auxiliary connecting piece close to a suction surface in the blade section mold; placing and fixing a prefabricated pressure surface main connecting piece and a pressure surface auxiliary connecting piece close to a pressure surface in the blade section mold;

the step of providing a core material at an inner surface of the blade segment mould to fix the first or second connector comprises:

arranging a first suction surface core material between the suction surface main connecting piece and the front edge of the blade segment mould in the blade segment mould;

a second suction surface core material is arranged between the suction surface main connecting piece and the suction surface auxiliary connecting piece;

a third suction surface core material is arranged between the suction surface auxiliary connecting piece and the rear edge of the blade section mould;

arranging a first pressure surface core material between the pressure surface main connecting piece and the front edge of the blade section mould in the blade section mould;

a second pressure surface core material is arranged between the pressure surface main connecting piece and the pressure surface auxiliary connecting piece;

a third pressure surface core material is arranged between the pressure surface auxiliary connecting piece and the rear edge of the blade section mould;

the blade section mould is internally provided with a blade section beam, and the step of coaxially arranging the blade section beam and the first connecting piece or the second connecting piece comprises the following steps:

placing and fixing a pressure surface main beam and a pressure surface auxiliary beam close to a pressure surface in the blade section mould;

the pressure surface main beam and the pressure surface main connecting piece are coaxially arranged; the pressure surface auxiliary beam and the pressure surface auxiliary connecting piece are coaxially arranged;

placing and fixing a suction surface main beam and a suction surface auxiliary beam close to a suction surface in the blade section mould;

the main suction surface beam and the auxiliary suction surface connecting piece are coaxially arranged;

laying an inner structural cloth layer in the blade section mould; 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 section beam comprises the following steps:

respectively paving a first inner structure cloth layer and a second inner structure cloth layer in the blade section mould; the first inner structure cloth layer and the first outer structure cloth layer are combined to wrap a pressure surface main connecting piece, a pressure surface auxiliary connecting piece, a pressure surface main beam and a pressure surface auxiliary beam which are close to a pressure surface;

the second inner structure cloth layer and the second outer structure cloth layer are combined to wrap a suction surface main connecting piece, a suction surface auxiliary connecting piece, a suction surface main beam and a suction surface auxiliary beam which are close to a suction surface;

and respectively arranging a front edge web plate and a rear edge web plate at the front edge and the rear edge in the blade section mould so as to connect the suction surface and the pressure surface, and closing the mould to obtain the blade section.

18. The method of making a blade segment in a segmented fan blade of claim 17, further comprising: the first outer structure layer comprises a first skin and first outer fixing cloth, the first skin is paved to form a second molded surface of the suction surface, and the first outer fixing cloth is paved below the second molded surface to form a first molded surface of the suction surface;

the second outer structure layer comprises a second skin and second outer fixing cloth, the second skin is paved to form a fourth molded surface of the pressure surface, and the second outer fixing cloth is paved below the fourth molded surface to form a third molded surface of the pressure surface;

the thickness of the first molded surface is gradually reduced or increased layer by layer along the length direction, and the first molded surface covers a chamfer area of the main beam or the auxiliary beam of the suction surface;

19. The method of claim 18, wherein each of the prefabricated suction side primary connection member, suction side secondary connection member, pressure side primary connection member and pressure side secondary connection member is divided into a connection section, a fixing section and a transition section, wherein the connection section protrudes from the first profile end surface;

the transition section is connected with the corresponding main beam or auxiliary beam;

the thickness of the pressure surface main beam and the suction surface main beam is gradually reduced at one end close to the corresponding transition section;

the thicknesses of the pressure surface auxiliary beam and the suction surface auxiliary beam close to one end of the corresponding transition section are gradually thinned;