Blade root structure and preparation method

Abstract

The invention provides a blade root structure and a preparation method, and relates to the technical field of wind power blades. According to the blade root structure, the first connecting piece is arranged, and the first connecting part is arranged on the first connecting piece; a second connecting part is arranged on the blade root flange, and the first connecting part is connected with the second connecting part; the first connecting part is embedded in the blade root laying body, the first connecting part is located on the outer side of the blade root laying body, and the end face of the blade root flange is connected with the blade root laying body through the gap filling part. According to the application, the first connecting part and the second connecting part are firstly connected, so that the first connecting piece and the blade root flange are mutually restrained, the relative position and the relative movement of the first connecting piece and the blade root flange are limited, and the situation that the first connecting part and the second connecting part are stressed unevenly due to an assembly inclined gap caused by unevenness of the blade root laying body and the end face of the first connecting piece is avoided.

Description

Technical Field

[0001] This application relates to the technical field of wind turbine blades, and particularly to a root structure and a preparation method thereof. Background Art

[0002] The blade is one of the important components of a wind turbine generator set, and the structure of the blade itself (such as the root of the blade) directly affects the performance of the wind turbine unit.

[0003] In the prior art, the root includes a root embedded component (such as a screw tube), a root ply body, and a root flange. The root embedded component and the root ply body form an integral structure during the preparation process. The root embedded component and the root ply body face the same plane of the root flange. It is necessary to manually detect the flatness of this plane, grind the plane that does not meet the flatness standard, and finally assemble the root flange.

[0004] However, manual grinding is prone to unevenness, resulting in an assembly inclined gap between the flange holes of the root flange and the root embedded component, causing uneven force and torque transmission between the root flange and the root embedded component, and even damaging the root flange, the root embedded component, and the root ply body. Summary of the Invention

[0005] This application provides a root structure and a preparation method thereof to solve the problem that manual grinding is prone to unevenness, resulting in an assembly gap between the flange holes of the root flange and the root embedded component, causing uneven force and torque transmission between the root flange and the root embedded component, and even damaging the root flange, the root embedded component, and the root ply body.

[0006] To achieve the above object, the technical solution of this application is as follows:

[0007] On the one hand, this application provides a root structure, including: a first connecting member, with a first connecting portion provided on the first connecting member; a root flange, with a second connecting portion provided on the root flange, and the first connecting portion is connected to the second connecting portion; a root ply body, the first connecting member is embedded in the root ply body, and the first connecting portion is located outside the root ply body; a gap filling member, the end face of the root flange is connected to the root ply body through the gap filling member.

[0008] In a possible implementation manner, in the root structure of the embodiment of this application, the gap filling member is an adhesive layer on one side of the root flange facing the first connecting member, and the adhesive layer is adhered to the end face of the root ply body.

[0009] In a possible implementation manner, in the root structure of the embodiment of this application, multiple root plies are stacked to form the root ply body, and at least part of the root plies are stacked around the first connecting member, so that the first connecting member is embedded between at least two adjacent root plies or embedded in an installation groove formed by one root ply.

[0010] In a possible implementation, in the root structure of the present application embodiment, the first connecting portion is a threaded portion provided on the first connecting member, the second connecting portion is a connecting hole provided on the root flange, and the threaded portion is threadedly connected to the connecting hole.

[0011] In a possible implementation, in the root structure of the present application embodiment, a stop portion is provided on the second connecting portion, and the stop portion is used to abut against the first connecting portion.

[0012] In a possible implementation, in the root structure of the present application embodiment, the connecting hole has a first connecting section and a second connecting section, the first connecting section and the second connecting section are communicated, the first connecting section is connected to the threaded portion, and the stop portion is provided between the first connecting section and the second connecting section.

[0013] In a possible implementation, in the root structure of the present application embodiment, the aperture of the first connecting section is larger than the aperture of the second connecting section.

[0014] In a possible implementation, in the root structure of the present application embodiment, the number of the first connecting members and the second connecting portions are both multiple, each first connecting member is spaced around the circumference of the root ply body, and each first connecting portion is connected to each second connecting portion in one-to-one correspondence.

[0015] In a possible implementation, in the root structure of the present application embodiment, the lengths of each first connecting portion in the insertion direction of the first connecting member are the same, and the lengths of each second connecting portion in the embedding direction of the first connecting member are the same.

[0016] On the other hand, the present application also provides a preparation method for the root structure, which is used to prepare the root structure in any one of the above embodiments, and includes:

[0017] Connect the first connecting portion of the first connecting member of the root structure to the second connecting portion of the root flange of the root structure; embed the first connecting member on the root ply body of the root structure; connect the first connecting member, the root flange and the root ply body through a gap filling member.

[0018] The blade root structure and preparation method provided by the present application. The blade root structure is provided with a first connecting member having a first connecting portion; a blade root flange having a second connecting portion, and the first connecting portion is connected to the second connecting portion; a blade root laminate, the first connecting member is embedded in the blade root laminate, and the first connecting portion is located outside the blade root laminate, and the blade root flange is connected to the blade root laminate. By first connecting the first connecting portion and the second connecting portion, the first connecting member and the blade root flange are mutually restricted, limiting their relative positions and relative movements, avoiding the assembly tilt gap between the first connecting portion and the second connecting portion caused by the unevenness of the blade root laminate, resulting in uneven stress on the first connecting portion and the second connecting portion. Moreover, during the preparation process (such as during the perfusion and vacuum pumping process), the first connecting member and the blade root flange are an assembled whole. Due to the mutual restraint between the first connecting member and the blade root flange, they will not tilt relative to each other, avoiding the assembly tilt gap caused by the unevenness between the blade root laminate and the end face of the first connecting member. Furthermore, the first connecting member is embedded in the blade root laminate, and the blade root flange and the blade root laminate are connected through a gap filling member, so that the gap filling member can fill the end face gap between the blade root flange and the blade root laminate, making the two closely fit, and prefabricating the first connecting member and the blade root flange into the process of forming the blade root laminate, so that the three form an integral body to enhance the overall stiffness of the blade root and prevent the blade root from deforming. In addition, the present application also eliminates the process of assembling the blade root flange after the blade root is polished, improving the efficiency of blade production and fan assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0020] Figure 1 Schematic diagram of the internal structure of the blade root structure provided by an embodiment of the present application;

[0021] Figure 2 Schematic diagram of the structure of the first connecting member provided by an embodiment of the present application;

[0022] Figure 3 Schematic diagram of the structure of the blade root flange provided by an embodiment of the present application;

[0023] Figure 4 is Figure 2 Schematic diagram of the first connecting member from another perspective in ;

[0024] Figure 5 is Figure 1 Left view of the blade root structure in ;

[0025] Figure 6 is Figure 5 Left view of the blade root structure in ;

[0026] Figure 7 For Figure 6 Flow chart of the preparation method of the middle blade root structure.

[0027] Explanation of the reference numerals in the drawings:

[0028] 110 - First connecting member; 111 - First connecting portion; 113 - First mounting hole;

[0029] 120 - Blade root flange; 121 - Second connecting portion; 122 - Stopping portion; 123 - First connecting section; 124 - Second connecting section;

[0030] 130 - Blade root laminate.

[0031] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and the textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Specific embodiments

[0032] Here, the exemplary embodiments will be described in detail, and their examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. On the contrary, they are merely examples of the apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0033] It should be noted that in the description of the embodiments of the present application, the terms indicating the orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, rather than indicating or implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0034] In addition, it should also be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0035] In this application, unless otherwise clearly specified and defined, terms such as "installation", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art.

[0036] The specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Root laminate: It refers to a structure formed after multiple root laminates are stacked, then through an infusion process (injecting glue or resin), and then cured.

[0038] In the prior art, the root includes a root embedded component (such as a screw tube), a root laminate, and a root flange. The root embedded component and the root laminate form an integral structure during the preparation process. The root embedded component and the root laminate face the same plane of the root flange. It is necessary to manually detect the flatness of this plane, grind the plane that does not meet the flatness standard, and finally assemble the root flange.

[0039] However, manual grinding is prone to unevenness, resulting in an assembly inclined gap between the flange holes of the root flange and the root embedded component, causing uneven force and torque transmission between the root flange and the root embedded component, and even damaging the root flange, the root embedded component, and the root laminate.

[0040] The present application provides a blade root structure and a preparation method. The blade root structure includes: a first connecting member, on which a first connecting portion is provided; a blade root flange, on which a second connecting portion is provided, and the first connecting portion is connected to the second connecting portion; a blade root laminate, the first connecting member is embedded in the blade root laminate, and the first connecting portion is located outside the blade root laminate, and the blade root flange is connected to the blade root laminate. By first connecting the first connecting portion and the second connecting portion, the first connecting member and the blade root flange are mutually constrained, restricting their relative positions and relative movements, avoiding the assembly inclination gap between the first connecting portion and the second connecting portion caused by the blade root laminate, resulting in uneven stress between the first connecting portion and the second connecting portion. Moreover, during the preparation process (such as during the process of perfusion and vacuum extraction), the first connecting member and the blade root flange are an assembled whole. Due to the mutual constraint between the first connecting member and the blade root flange, they will not tilt relative to each other. Further, the first connecting member is embedded in the blade root laminate, and the blade root flange and the blade root laminate are connected through a gap filling member, so that the gap filling member can fill the end face gap between the blade root flange and the blade root laminate, making them closely fit, and making the first connecting member and the blade root flange prefabricated during the formation process of the blade root laminate preparation, so that the three form an integral body to enhance the overall stiffness of the blade root and prevent the blade root from deforming. In addition, the present application also eliminates the processes of blade root grinding and blade root flange assembly, improving the efficiency of blade production and fan assembly.

[0041] The following will combine Figures 1 to 7 and specific embodiments to elaborate on the present application in detail.

[0042] On the one hand, the present application provides a blade root structure, including: a first connecting member 110, on which a first connecting portion 111 is provided; a blade root flange 120, on which a second connecting portion 121 is provided, and the first connecting portion 111 is connected to the second connecting portion 121; a blade root laminate 130, the first connecting member 110 is embedded in the blade root laminate 130, and the first connecting portion 111 is located outside the blade root laminate 130; a gap filling member 140, the end face of the blade root flange 120 is connected to the blade root laminate 130 through the gap filling member.

[0043] The first connecting member 110 is provided with a first connecting portion 111 thereon. The first connecting member 110 is configured to be disposed within the blade root laminate 130 to play a role in supporting and connecting. For example, the first connecting member 110 is embedded in the blade root laminate 130, and the first connecting portion 111 is located outside the end face of the blade root laminate 130. The blade root flange 120 is provided with a second connecting portion 121 thereon. The first connecting portion 111 is connected to the second connecting portion 121. Exemplarily, the first connecting portion 111 is a connecting thread on the outer peripheral side of the first connecting member 110, and the second connecting portion 121 is a connecting hole. The inner wall of the connecting hole is provided with a thread adapted to the connecting thread to achieve the threaded connection between the first connecting portion 111 and the second connecting portion 121.

[0044] The blade root laminate 130, the first connecting member 110 is embedded in the blade root laminate 130, and the first connecting portion 111 is located outside the end face of the blade root laminate 130. The blade root flange 120 is connected to the end face of the blade root laminate 130.

[0045] To facilitate the assembly of the blade root structure to the installation position (such as the hub of a wind turbine generator), a first mounting hole 113 is provided on the first connecting member 110, and a second connecting section 124 is provided on the blade root flange 120. The connecting hole is located between the first mounting hole 113 and the second connecting section 124, and the axes of the first mounting hole 113, the second connecting section 124, and the connecting hole are all on the same straight line. During use, the second connecting section 124 is aligned with the flange hole on the hub to make the second connecting section 124 concentric with the flange hole of the hub. Fasteners such as bolts and studs are used to connect the flange hole and the second connecting section 124, or the fasteners sequentially pass through the flange hole, the second connecting section 124, the connecting hole, and the first mounting hole 113, thereby enhancing the connection strength. Specifically, align the second connecting section 124 of the blade root flange 120 with the hub flange hole, insert the fastener and pass through the second connecting section 124, continue to pass through the connecting hole, and finally enter the first mounting hole 113 of the first connecting member 110, and tighten the nut to complete the axial fixation.

[0046] It should be noted that the present application does not limit the structures of the first connecting member 110 and the blade root flange 120. For example, the first connecting member 110 can be a screw sleeve.

[0047] Moreover, in order to reduce costs, the bushing and the root flange can use existing parts. After threading operations are performed to make the thread specifications of the two consistent, so as to ensure that the two are tightly connected by threads. Then, necessary post-treatment processes are carried out and transported to the blade factory for layup. Exemplarily, on the side of the root flange facing the bushing, the existing second connection section 124 (such as bolt holes) is reamed to form connection holes, and threading 101 is performed on the inner wall of the connection holes. The depth of the connection holes should be set according to the selected flange thickness and the structure of the bushing. This application does not limit this, but the depth of the connection holes should be the same to ensure that the connection lengths of all bushings and flanges are the same. Threading is performed on the outer ring of the bearing end of the bushing, and the external thread specification of the bushing is the same as that of the flange thread. Other structures and processes of the bushing remain unchanged.

[0048] In this application, by first connecting the first connection part 111 and the second connection part 121, the first connector 110 and the root flange 120 are mutually constrained, restricting their relative positions and relative movements, and avoiding the assembly inclination gap between the first connection part 111 and the second connection part 121 caused by the root layup body 130, resulting in uneven forces on the first connection part 111 and the second connection part 121. Moreover, during the preparation process (such as during the perfusion and vacuum extraction process), the first connector 110 and the root flange 120 are an assembled whole. Due to the mutual constraint between the first connector 110 and the root flange 120, the two will not tilt relative to each other, avoiding the assembly inclination gap caused by the unevenness between the root layup body and the end face of the first connector. Moreover, the first connector 110 is embedded in the root layup body 130, and the root flange 120 and the root layup body 130 are connected through a gap filling member, so that the gap filling member can fill the end face gap between the root flange 120 and the root layup body 130, making the two fit tightly, and making the first connector 110 and the root flange 120 prefabricated into the process of forming the root layup body 130, so that the three form an integral body to enhance the overall stiffness of the root and prevent the root from deforming. In addition, this application also eliminates the processes of root grinding and root flange assembly, improving the efficiency of blade production and fan assembly.

[0049] In a possible implementation manner, in the root structure in the embodiment of this application, the gap filling member is an adhesive layer on the side of the root flange 120 facing the first connector 110, and the adhesive layer is bonded to the end face of the root layup body 130.

[0050] The root layup body 130 is formed by laminating root layup layers, and resin is formed through a filling process

[0051] In a possible implementation, in the root structure of the present application embodiment, multiple root plies are stacked to form a root ply body 130, and at least part of the root plies are stacked around the first connecting member 110, so that the first connecting member 110 is embedded between at least two adjacent root plies or embedded in an installation groove formed by one root ply.

[0052] For example, multiple root plies are stacked in a specific order and direction, such as being stacked in sequence in the direction of gravity to form the overall root ply body 130. During the laying process, first place the root ply, then place the first connecting member 110 on it, and then continue to cover the subsequent root plies, so that the first connecting member 110 is clamped between two adjacent layers. Or, first place the first connecting member 110, and then cover the first connecting member 110 with the root ply. The first connecting member 110 can be covered up and down by two root plies, or a flexible root ply can cover the first connecting member 110 according to the outer contour of the first connecting member 110. The installation groove is formed according to the coverage range formed by the outer contour of the first connecting member 110 by the root ply, and the structure of the first connecting member 110 is fitted.

[0053] A gap filling member is provided on the side of the root flange 120 facing the first connecting member 110, and the gap filling member is used for bonding with the root ply body 130.

[0054] It should be noted that the gap filling member can be a glue layer, so that one side of the first connecting member 110 is bonded to the end face of the root ply body 130, and the gap between the first connecting member 110 and the root ply body 130 is filled by the glue layer. The glue layer can be added in the forming and perfusion process of the first connecting member 110, the root flange 120 and the root ply body 130. For example, in the preparation mold, the assembled first connecting member 110 and the root flange 120 are placed at the preparation position of the preparation mold, and the root plies in the root ply body 130 are laid in sequence. One end of each root ply abuts against the first connecting member 110, and the root flange 120 is embedded in the root plies. After laying, through the vacuum perfusion process, the preparation mold is evacuated, and glue or resin is injected into the preparation mold to cover the first connecting member 110 and each root ply, and a bonding layer is formed between the end face of the root flange 120 and the side of each root ply facing the root flange 120.

[0055] It can be understood that after the end of the root ply abuts against the root flange 120, glue is finally injected to form a gap filling member to fill the gap between the end face of the root flange 120 and the end of the root ply. In a possible implementation, in the root structure of the present application embodiment, the root ply body 130 has an installation groove, and the first connecting member 110 is embedded in the installation groove.

[0056] The root laying body 130 is pre-processed with an installation groove that is matingly connected to the first connecting member 110, and the screw sleeve is embedded in the groove by interference fit or bonding. The groove wall of the installation groove is used to connect with the outer peripheral side of the screw sleeve. The bottom of the installation groove may also be provided with a positioning boss to restrict the circumferential rotation of the screw sleeve and prevent offset caused by torque transmission during assembly.

[0057] In addition, anti-rotation protrusions may be provided on the installation groove. Each anti-rotation protrusion protrudes radially toward the first connecting member 110. Corresponding anti-rotation grooves are provided on the first connecting member 110. When the first connecting member 110 is embedded in the installation groove of the root laying body 130, the anti-rotation grooves of the first connecting member 110 engage with the anti-rotation protrusions, generating circumferential restraint on the first connecting member 110. Through the restraint of the first connecting member 110 by the root flange 120 and the anti-rotation protrusions on the first connecting member 110, a double restraint is formed to prevent the root flange 120 from tilting during vacuum infusion.

[0058] In a possible implementation manner, in the root structure of the present application embodiment, the first connecting portion 111 is a threaded portion provided on the first connecting member 110, and the second connecting portion 121 is a connecting hole provided on the root flange 120, and the threaded portion is threadedly connected to the connecting hole.

[0059] A connecting thread is provided on the outer peripheral side of the first connecting member 110. The threaded portion is the connecting thread. A connecting hole is provided at one end of the root flange 120 facing the root laying body 130, and the connecting hole forms the second connecting portion 121, and the connecting thread is connected to the connecting hole.

[0060] In the root structure, a connecting thread is processed on the outer peripheral side of the first connecting member 110 to form the first connecting portion 111. An axial connecting hole is opened on one side of the end face of the root flange 120 facing the root laying body 130, and a thread matching the first connecting portion 111 is processed on its inner wall to form the second connecting portion 121. During assembly, the threaded section of the first connecting member 110 is screwed into the connecting hole of the root flange 120, and the two are axially locked through thread engagement. The first connecting member 110 and the root flange 120 can adjust the pre-tightening force through split-type threaded connection. At the same time, the self-locking characteristic of the thread pair can resist loosening under the alternating load of the root, first making the first connecting member 110 and the root flange 120 become an integral body through threaded connection, which is convenient for the subsequent forming process with the root laying body 130.

[0061] A first installation hole 113 is provided on the first connecting member 110, and a second connecting section 124 is provided on the root flange 120; the axes of the first installation hole 113, the second connecting section 124, and the connecting hole are all on the same straight line.

[0062] After the first connecting member 110, the root flange 120, and the root laminate 130 are integrally prefabricated and formed, in order to install the root structure at the installation position, external fasteners (such as studs and bolts) sequentially pass through the hub flange holes, the second connecting section 124, the connecting holes, and the first mounting holes 113 to form a through-type force path. The coaxiality of the three holes enables the load to be transmitted along a single axis, avoiding stress concentration caused by multi-path forces. The first mounting hole serves as the internal channel of the bushing, which can reduce the weight of the root structure.

[0063] In a possible implementation, in the root structure of the embodiment of the present application, a stop portion 122 is provided on the second connecting portion 121, and the stop portion 122 is used to abut against the first connecting portion 111.

[0064] Each second connecting portion 121 is provided with a stop portion 122, and the stop portion 122 is used to abut against the first connecting portion 111.

[0065] Exemplarily, one end of the connecting hole facing away from the first connecting member 110 has a stop portion 122, and the limiting plane of the stop portion 122 is parallel to the end face of the first connecting member 110, and the distance between the two is equal to the thread engagement depth.

[0066] The stop portion 122 is annular. Since the diameters of the second connecting section 124 and the connecting hole in the root flange 120 are different, the diameter of the connecting hole is larger than that of the second connecting section 124, and a stepped surface is formed between the root flange 120 and the second connecting section 124. This stepped surface is the stop portion 122, which is thus used to abut against the first connecting portion 111.

[0067] In addition, in some embodiments, a buffer member may also be provided on the stop portion 122. The buffer member is used to abut against the end face of the first connecting member 110 to play a buffering role and reduce the impact on the first connecting member 110. Tighten the first connecting member 110 until the end face of the first connecting member 110 is pressed against the stop portion 122 to limit the thread engagement length of each first connecting member 110; the stop portion 122 and the threaded connection jointly limit the relative movement between the first connecting member 110 and the root flange 120 to prevent the bushing from axially moving due to negative pressure during the vacuum infusion process.

[0068] In a possible implementation, in the root structure of the embodiment of the present application, the connecting hole has a first connecting section 123 and a second connecting section 124. The first connecting section 123 and the second connecting section 124 are connected, the first connecting section 123 is connected to the threaded portion, and the stop portion 122 is provided between the first connecting section 123 and the second connecting section 124.

[0069] Among them, the diameter of the first connecting section 123 is greater than that of the second connecting section 124, forming a stepped aperture structure. During the thread machining process, in the thread engagement stage, the larger aperture provides a retraction space for the thread tool to avoid machining interference. When the first connecting member 110 is connected to the blade root flange 120, an annular stepped surface is formed between the connecting hole and the second connecting section 124, which can serve as an axial stop to limit the movement of the first connecting portion 111 and prevent excessive compressive deformation of the thread pair.

[0070] In a possible implementation manner, in the blade root structure in the embodiment of the present application, the number of the first connecting members 110 and the second connecting portions 121 is multiple. Each first connecting member 110 is arranged at intervals around the circumferential side of the blade root laminate 130, and each first connecting portion 111 is connected to each second connecting portion 121 in a one-to-one correspondence.

[0071] The number of the first connecting members 110 and the second connecting portions 121 is multiple. Each first connecting portion 111 and each second connecting portion 121 are arranged at intervals around the circumferential side of the blade root laminate 130, and each first connecting portion 111 is connected to each second connecting portion 121 in a one-to-one correspondence.

[0072] Each first connecting portion 111 and the second connecting portion 121 can be arranged at equal angular intervals (such as an angular interval of 30 degrees), and form an annular array arrangement through one-to-one thread engagement. The load is evenly distributed along the circumference to avoid single-point stress concentration. When the blade is twisted by the wind load, multiple circumferential connecting pairs cooperate to bear the force, prevent the blade from deforming, and maintain the connection stiffness through the elastic compensation of the thread pair.

[0073] In a possible implementation, for the blade root structure in the embodiments of the present application, the lengths of the first connecting portions 111 along the insertion direction of the first connecting member 110 are the same, and the lengths of the second connecting portions 121 along the pre-embedded direction of the first connecting member 110 are the same. The first connecting member 110 is a screw sleeve. Among them, the first connecting member 110 can adopt a standard screw sleeve, and the blade root flange 120 can adopt a common blade root flange. The external thread of the screw sleeve is directly matched with the internal thread tapped after reaming the flange, using existing parts to reduce the customization cost. During prefabrication, the standard screw sleeve is screwed into the blade root flange until the stop portion 122, so that the screw sleeve and the blade root flange form an integral structure. Then, this integral structure is placed into the mold of the blade root laminate 130, so that the screw sleeve is pre-embedded in the blade root laminate 130. Through the vacuum infusion molding process, the cured screw sleeve, blade root flange and blade root laminate 130 form an integrated structure, thereby eliminating the operation of grinding the blade root pitch circle. By pre-assembling the blade root flange and the screw sleeve before the blade root laminate 130 is cured, the flatness of the pitch circle is guaranteed, avoiding cumbersome assembly operations and cumulative errors caused by split assembly. For example, for the blade root structure of a transmission, it is necessary to manually check the flatness of the blade root pitch circle first, and then grind the unqualified flatness (such as local protrusions of the blade root pre-embedded components) before the blade root flange can be assembled with the blade root, and finally the blade root flange is assembled with the hub flange of the fan.

[0074] On the other hand, the present application also provides a preparation method for a blade root structure, which is used to prepare the blade root structure in any one of the above embodiments, including:

[0075] S100. Connect the first connecting portion 111 of the first connecting member 110 of the blade root structure with the second connecting portion 121 of the blade root flange 120 of the blade root structure. After reaming on the side of the first connecting member 110 facing the blade root flange 120, thread tapping is performed to form the first connecting portion 111. Thread tapping is performed on the outer peripheral side of one end of the blade root flange 120 facing the first connecting member 110 to form the second connecting portion 121. Apply force to relatively rotate the blade root flange 120 and the first connecting member 110, so that the first connecting portion 111 is threadedly connected with the second connecting portion 121, thereby fixing the relative positions of the first connecting member 110 and the blade root flange 120.

[0076] S200. Pre-embed the first connecting member 110 in the blade root laminate 130 of the blade root structure. Pre-embed the first connecting member 110 in the blade root laminate 130. Pre-embed the first connecting member 110 in the blade root laminate 130, and the end face of the blade root flange 120 is in contact with the end face of the blade root laminate 130.

[0077] S300. Connect the first connecting member 110, the root flange 120 and the root ply body 130 through a gap filler. Lay the root ply body 130, embed the assembled first connecting member 110 and the root flange 120 in the root ply body 130, and finally prefabricate the first connecting member 110, the root flange 120 and the root ply body 130 together by pouring resin. In the preparation mold, the assembled first connecting member 110 and the root flange 120 are placed at the preparation position of the preparation mold, and the root plies in the root ply body 130 are laid in sequence. One end of each root ply abuts against the first connecting member 110, and the root flange 120 is embedded in the root ply. After laying, through the vacuum infusion process, evacuate the preparation mold and inject glue or resin into the preparation mold to cover the first connecting member 110 and each root ply, and form an adhesive layer between the end face of the root flange 120 and the side of each root ply facing the root flange 120.

[0078] In the root preparation method of the present application, by first connecting the first connecting portion 111 and the second connecting portion 121, the first connecting member 110 and the root flange 120 are mutually constrained, restricting their relative positions and relative movements, and avoiding (such as during the vacuum infusion process, the first connecting member 110 will not be relatively tilted due to the negative pressure of the vacuum pumping). Moreover, the root flange 120 can also provide support for the first connecting member 110, without the need for additional mold positioning support tools. After the first connecting member 110 and the root flange 120 are assembled into an integral body through the connection of the first connecting portion 111 and the second connecting portion 121. The first connecting member 110 is embedded in the root ply body 130, and the root flange 120 and the root ply body 130 are connected through a gap filler 140, so that the gap filler can fill the end face gap between the root flange 120 and the root ply body 130, making the two closely fit, and enabling the first connecting member 110 and the root flange 120 to be prefabricated during the formation of the root ply body 130, so that the three form an integral body to enhance the overall stiffness of the root and prevent the root from deforming. In addition, the present application also eliminates the processes of root grinding and root flange assembly, improving the efficiency of blade production and fan assembly.

[0079] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0080] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A blade root structure, characterized in that, Comprising: A first connecting member, on which a first connecting portion is provided; A root flange, on which a second connecting portion is provided, and the first connecting portion is connected to the second connecting portion; A root ply body, the first connecting member is embedded in the root ply body, and the first connecting portion is located outside the root ply body; A gap filling member, the end face of the root flange is connected to the root ply body through the gap filling member.

2. The blade root structure according to claim 1, characterized in that, The gap filling member is an adhesive layer on the side of the root flange facing the first connecting member, and the adhesive layer is adhered to the end of the root ply body.

3. The blade root structure according to claim 1 or 2, characterized in that, A plurality of root plies are stacked to form the root ply body, and at least a part of the root plies are stacked around the first connecting member, so that the first connecting member is embedded between at least two adjacent root plies or embedded in an installation groove formed by one root ply.

4. The blade root structure according to claim 1, characterized in that, The first connecting portion is a threaded portion provided on the first connecting member, the second connecting portion is a connecting hole provided on the root flange, and the threaded portion is threadedly connected to the connecting hole.

5. The blade root structure according to claim 4, characterized in that, A stop portion is provided on the second connecting portion, and the stop portion is used to abut against the first connecting portion.

6. The blade root structure according to claim 5, characterized in that, The connecting hole has a first connecting section and a second connecting section, the first connecting section and the second connecting section are communicated, the first connecting section is connected to the threaded portion, and the stop portion is provided between the first connecting section and the second connecting section.

7. The blade root structure according to claim 6, characterized in that, The aperture of the first connecting section is larger than the aperture of the second connecting section.

8. The blade root structure according to any one of claims 4-7, characterized in that, The number of the first connecting members and the second connecting portions are both multiple, each of the first connecting members is spaced around the circumferential side of the root ply body, and each of the first connecting portions is connected to each of the second connecting portions in one-to-one correspondence.

9. The blade root structure according to claim 8, characterized in that, The lengths of each of the first connecting portions in the insertion direction of the first connecting member are the same, and the lengths of each of the second connecting portions in the insertion direction of the first connecting member are the same.

10. A preparation method of a blade root structure for preparing the blade root structure according to any one of the above claims 1-9, characterized in that, Comprising: Connecting the first connecting portion of the first connecting member of the root structure to the second connecting portion of the root flange of the root structure; Embedding the first connecting member on the root ply body of the root structure; Connecting the first connecting member, the root flange and the root ply body through a gap filling member.

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