Sectional type fan blade connecting structure

Abstract

The utility model discloses a sectional type fan blade connecting structure which comprises a first blade section, a second blade section and a connecting structure used for connecting the first blade section and the second blade section, one side of the first blade section is concaved inwards to form a matching groove, and one side of the second blade section protrudes outwards to form a matching protruding block. A plurality of positioning grooves are formed in the first blade section, and positioning strips matched with the positioning grooves are integrally connected to the second blade section; the connecting structure comprises an internal connecting assembly and an external connecting assembly. The connecting structure is designed and comprises the internal connecting assembly and the external connecting assembly, and the internal connecting assembly achieves preliminary connection between the first blade section and the second blade section; according to the external connecting assembly, stable connection between the first blade section and the second blade section is achieved through a strip-shaped wedge block, an arc-shaped wedge block, a first outer sleeve piece and a second outer sleeve piece, and the first blade section and the second blade section are effectively prevented from loosening or separating during operation.

Description

Technical Field

[0001] The utility model relates to the technical field of fan blades, and more specifically, to a connection structure of segmented fan blades. Background Art

[0002] In the field of wind power generation, wind turbine blades are key components whose performance directly impacts the efficiency and reliability of the entire wind power generation system. With the continuous advancement of wind power generation technology, the design requirements for wind turbine blades are becoming increasingly stringent, especially in terms of blade connection structures. As blade length increases, the difficulty of transporting blades becomes increasingly difficult with one-piece blade molding, leading to the development of segmented blades.

[0003] In existing technologies, segmented connections for wind turbine blades often rely on simple plug-in or bolt connections. These connections are prone to loosening or falling off during prolonged operation or when subjected to strong winds, resulting in reduced blade performance and even safety accidents. Therefore, it is necessary to design a structure that can ensure a stable connection between blade segments to improve the reliability and durability of the entire wind turbine blade. Research to address these issues led to the invention of this device. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a connection structure of segmented fan blades to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a connection structure for a segmented fan blade, comprising a first blade segment, a second blade segment, and a connection structure for connecting the first blade segment and the second blade segment, wherein one side of the first blade segment is inwardly recessed to form a mating groove, and one side of the second blade segment is outwardly protruded to form a mating protrusion, and the mating protrusion is adapted to fit the mating groove;

[0006] The first blade segment is provided with a plurality of positioning grooves, and the second blade segment is integrally connected with a positioning strip adapted to the positioning grooves;

[0007] The connection structure includes an internal connection component and an external connection component.

[0008] Furthermore, the internal connection assembly includes a matching block arranged on the inner wall surface of the first blade segment, and a plug interface is provided on the matching block.

[0009] Furthermore, the internal connection component also includes a connection block arranged on the inner wall of the second blade segment, the outer end of the connection block is fixedly connected to a plug-in block adapted to the plug interface, a mounting hole is opened on the plug-in block, a spring is arranged in the mounting hole, and the outer end of the spring is connected to a limiting block.

[0010] Furthermore, the thickness of the matching block is equal to the distance between the connecting block and the limiting block.

[0011] Furthermore, the external connection component includes a strip wedge block arranged on the outer side walls of the first blade segment and the second blade segment and an arcuate wedge block arranged on the outer bottom walls of the first blade segment and the second blade segment, a first outer set of components is arranged outside the strip wedge block, and a second outer set of components is arranged outside the arcuate wedge block.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model is designed with a connection structure, including an internal connection component and an external connection component. The internal connection component adopts a spring limit structure. When the first blade segment and the second blade segment are tightly fitted, the spring pops out the limit block to achieve plug-in fixation, ensuring the stability of the connection. The external connection component uses a strip wedge block and an arc wedge block and their corresponding first and second outer sets to be socketed and bolted together to form a mechanical connection, effectively preventing the first and second blade segments from loosening or separating during operation, thereby improving the reliability and durability of the entire fan blade.

[0014] 2. The utility model realizes rapid positioning between the first blade segment and the second blade segment by providing matching grooves and matching protrusions, positioning grooves and positioning strips, effectively avoids the misalignment problem during the connection process, and significantly improves the connection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 A schematic diagram of the structure provided by the utility model;

[0017] Figure 2 A side view of the structure provided by the utility model;

[0018] Figure 3 A schematic structural diagram of the first blade segment provided by the present invention;

[0019] Figure 4 This is a schematic structural diagram of the second blade segment provided by the present invention;

[0020] Figure 5 This is a partial schematic diagram of the internal connection assembly provided by the utility model.

[0021] Description of reference numerals:

[0022] 1. First blade segment; 2. Second blade segment; 3. Connection structure; 301. Internal connection component; 3011. Matching block; 3012. Plug interface; 3013. Connection block; 3014. Plug block; 3015. Spring; 3016. Limit block; 302. External connection component; 3021. Strip wedge block; 3022. Arc wedge block; 3023. First outer kit; 3024. Second outer kit; 4. Positioning groove; 5. Positioning bar; 6. Matching groove; 7. Matching protrusion. DETAILED DESCRIPTION

[0023] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0024] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] Example:

[0026] Refer to the attached Figure 1 and Figure 2 In this embodiment, a connection structure of a segmented wind turbine blade includes a first blade segment 1, a second blade segment 2, and a connection structure 3 for connecting the first blade segment 1 and the second blade segment 2. The connection structure 3 includes an internal connection component 301 and an external connection component 302.

[0027] Refer to the attached Figure 3 and Figure 4 One side of the first blade segment 1 is recessed inward to form a mating groove 6, while one side of the second blade segment 2 is raised outward to form a mating protrusion 7, which mates with the mating groove 6. The first blade segment 1 is provided with a plurality of positioning grooves 4, and the second blade segment 2 is integrally connected with a positioning bar 5 that mates with the positioning grooves 4. The provision of the mating grooves 6 and mating protrusions 7, and the positioning grooves 4 and positioning bar 5, improves the positioning accuracy and connection efficiency between the first blade segment 1 and the second blade segment 2, providing a foundation for subsequent tight connection. The matching of shape and position ensures that the two blade segments are accurately aligned during the connection process, preventing misalignment.

[0028] Refer to the attached Figure 3-Figure 5The internal connection component 301 includes a matching block 3011 arranged on the inner wall surface of the first blade segment 1, and the matching block 3011 and the first blade segment 1 are connected to each other as a whole by a welding process. There are two matching blocks 3011, which are arranged on the inner walls on both sides of the first blade segment 1. The matching block 3011 is provided with a plug-in interface 3012. The internal connection component 301 also includes a connecting block 3013 arranged on the inner wall surface of the second blade segment 2, and the connecting block 3013 and the second blade segment 2 are connected to each other as a whole by a welding process. There are two connecting blocks 3013, and the outer end of the connecting block 3013 is fixedly connected to a plug-in block 3014 adapted to the plug-in interface 3012. The plug-in block 3014 is provided with a mounting hole, and a spring 3015 is provided in the mounting hole. The outer end of the spring 3015 is connected to the limiting block 3016, wherein the thickness of the matching block 3011 is equal to the distance between the connecting block 3013 and the limiting block 3016.

[0029] During assembly, the first blade segment 1 and the second blade segment 2 are positioned with the cooperation between the mating groove 6 and the mating protrusion 7, the positioning groove 4 and the positioning strip 5, and then the limit block 3016 is pressed so that the limit block 3016 is retracted into the mounting hole. At this time, the spring 3015 is in a compressed state. During the connection between the first blade segment 1 and the second blade segment 2, the inner wall of the plug interface 3012 hinders the limit block 3016, making it impossible for the limit block 3016 to pop out. When the first blade segment 1 and the second blade segment 2 are tightly fitted, the limit block 3016 just pops out of the mounting hole under the action of the spring 3015. At this time, the preliminary connection between the first blade segment 1 and the second blade segment 2 is achieved.

[0030] Refer to the attached Figure 1 、 Figure 3 and Figure 4 The external connection component 302 includes a strip wedge block 3021 arranged on the outer side wall of the first blade segment 1 and the second blade segment 2 and an arc-shaped wedge block 3022 arranged on the outer bottom wall of the first blade segment 1 and the second blade segment 2. The cross-sections of the strip wedge block 3021 and the arc-shaped wedge block 3022 are both right-angled trapezoidal structures. A first outer kit 3023 is arranged on the outside of the strip wedge block 3021, and a second outer kit 3024 is arranged on the outside of the arc-shaped wedge block 3022. The first outer kit 3023 is made of stainless steel, and the second outer kit 3024 is made of nickel-based alloy. The first outer kit 3023 made of stainless steel provides sufficient strength and corrosion resistance to ensure the stable connection of the strip wedge block 3021. The second outer kit 3024 made of nickel-based alloy has better flexibility and strength to adapt to the arc structure.

[0031] When the first blade segment 1 and the second blade segment 2 are initially connected, the two strip wedge blocks 3021 on the outer bottom walls of the first blade segment 1 and the second blade segment 2, located on the same horizontal plane, fit together. The first outer sleeve 3023 is then fitted over the two strip wedge blocks 3021 and secured with bolts. The two arcuate wedge blocks 3022 on the outer bottom walls of the first blade segment 1 and the second blade segment 2 fit together. The second outer sleeve 3024 is then fitted over the two arcuate wedge blocks 3022 and secured with bolts. This completes the connection between the first blade segment 1 and the second blade segment 2. The wedge-shaped design enhances the stability of the connection between the strip wedge blocks 3021, the arcuate wedge blocks 3022, and the first and second outer sleeves 3023 and 3024.

[0032] The connection structure 3 of the segmented fan blade realizes the preliminary positioning between the first blade segment 1 and the second blade segment 2 by cooperating with the groove 6 and the cooperating protrusion 7, and the positioning groove 4 and the positioning strip 5, and then uses the spring 3015 limiting structure of the internal connection component 301 to realize the preliminary connection between the first blade segment 1 and the second blade segment 2 after tight fitting. Finally, the strip wedge block 3021 and the arc wedge block 3022 of the external connection component 302 and their corresponding first outer kit 3023 and second outer kit 3024 are connected and bolted to realize a firm connection between the first blade segment 1 and the second blade segment 2, thereby preventing the first blade segment 1 and the second blade segment 2 from loosening or separating during operation.

[0033] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A connection structure for a segmented fan blade, comprising a first blade segment (1), a second blade segment (2), and a connection structure (3) for connecting the first blade segment (1) and the second blade segment (2), characterized in that: One side of the first blade segment (1) is inwardly recessed to form a matching groove (6), and one side of the second blade segment (2) is outwardly protruded to form a matching convex block (7), and the matching convex block (7) is adapted to the matching groove (6); The first blade segment (1) is provided with a plurality of positioning grooves (4), and the second blade segment (2) is integrally connected with a positioning strip (5) adapted to the positioning grooves (4); The connection structure (3) comprises an internal connection component (301) and an external connection component (302).

2. The connection structure of a segmented fan blade according to claim 1, characterized in that: The internal connection component (301) comprises a matching block (3011) arranged on the inner wall surface of the first blade segment (1), and a plug interface (3012) is provided on the matching block (3011).

3. The connection structure of a segmented fan blade according to claim 2, characterized in that: The internal connection assembly (301) further comprises a connection block (3013) arranged on the inner wall surface of the second blade segment (2); the outer end of the connection block (3013) is fixedly connected to a plug-in block (3014) adapted to the plug-in interface (3012); a mounting hole is provided on the plug-in block (3014); a spring (3015) is provided in the mounting hole; the outer end of the spring (3015) is connected to a limit block (3016).

4. The connection structure of a segmented fan blade according to claim 3, characterized in that: The thickness of the matching block (3011) is equal to the distance between the connecting block (3013) and the limiting block (3016).

5. The connection structure of segmented fan blades according to claim 1, characterized in that: The external connection component (302) comprises a strip-shaped wedge block (3021) arranged on the outer side walls of the first blade segment (1) and the second blade segment (2) and an arc-shaped wedge block (3022) arranged on the outer bottom walls of the first blade segment (1) and the second blade segment (2); a first outer sleeve (3023) is arranged outside the strip-shaped wedge block (3021), and a second outer sleeve (3024) is arranged outside the arc-shaped wedge block (3022).

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