Blade and hub connecting structure and wind generating set

Abstract

The invention discloses a blade and hub connecting structure and a wind generating set, and relates to the technical field of wind power. According to the blade and hub connecting structure, an inserting piece is arranged at the end of the blade structure, the hub is provided with an inserting cavity used for being connected with the inserting piece in an embedded mode, the inserting piece is provided with a first magnetic piece, and a second magnetic piece is arranged in the inserting cavity. The first magnetic piece is connected with the second magnetic piece in a magnetic attraction manner; and clamping mechanisms are arranged on the two opposite sides of the interior of the insertion cavity correspondingly, each clamping mechanism comprises a clamping driving device and a clamping plate, and the clamping driving devices are used for driving the clamping plates to get close to the direction of the insertion piece so that the insertion piece can be clamped and fixed between the two clamping plates. According to the technical scheme, the connection firmness between the hub and the blade structure can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a blade and hub connection structure and a wind turbine generator set. Background Art

[0002] With the growing global demand for renewable energy, wind turbines, as power generation equipment that converts wind energy into electricity, play a vital role in the renewable energy sector and have garnered widespread attention and application. A typical wind turbine consists of a hub and at least two blade structures, arranged equidistantly around the hub's axis. The blade structures drive the hub's rotation, capturing wind energy and converting it into electricity. These wind turbines are the core components of wind power generation systems.

[0003] Typically, a detachable connection is used between the hub and blade structure to facilitate long-distance transportation of wind turbines. However, in existing technologies, the connection between the hub and blade structure is weak. Over extended operation of the wind turbine, the connection can become loose, causing the blade structure to detach from the hub and potentially lead to safety accidents.

[0004] It should be noted that the above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a blade and hub connection structure and a wind turbine generator set, aiming to improve the connection firmness between the hub and the blade structure.

[0006] To achieve the above-mentioned object, the present invention proposes a blade and hub connection structure, which is applied to a wind turbine generator set. The wind turbine generator set includes a hub and at least two blade structures; Specifically, the blade and hub connection structure includes: An insert is provided at the end of the blade structure, and the hub is provided with an insertion cavity for the insert to be engaged and connected, wherein the insert is provided with a first magnetic member, and a second magnetic member is provided inside the insertion cavity, and the first magnetic member is magnetically connected to the second magnetic member; In addition, clamping mechanisms are respectively provided on opposite sides of the interior of the insertion cavity, and each of the clamping mechanisms includes a clamping drive device and a clamping plate. The clamping drive device is used to drive the clamping plate toward the insert so that the insert is clamped and fixed between the two clamping plates.

[0007] In one embodiment, the blade structure includes a main blade and a sub-blade assembly, wherein a first end of the main blade is connected to the hub; the sub-blade assembly includes a sleeve and at least three sub-blades, wherein the sleeve is connected to a second end of the main blade; the sub-blade assembly can be switched to a first configuration or a second configuration; When the ambient wind speed is greater than or equal to a preset value, the blade assembly switches to the first configuration; at this time, at least three blades are arranged in a straight line along the width direction of the main blade, and two adjacent blades are affixed to each other to form a blade array, and the blade array extends along the length direction of the main blade; When the ambient wind speed is lower than a preset value, the sub-blade assembly switches to the second form; at this time, at least three of the sub-blades are distributed in a ring at equal distances around the axis of the sleeve member; at least three of the sub-blades can drive the sleeve member to rotate relative to the main blade under wind drive to generate wind power.

[0008] In one embodiment, the sub-blade assembly includes a displacement drive mechanism, which is used to drive the sleeve member to displace along the width direction of the main blade so as to move the sub-blade array to the front end area of ​​the main blade; Furthermore, the blade assembly includes a rotation drive mechanism, which is used to drive at least three of the blades to switch between the first form and the second form.

[0009] In one embodiment, the displacement driving mechanism includes a displacement driving device, a driving rod and a connecting plate; a first fixing plate and a second fixing plate are provided at one end of the sleeve member facing the displacement driving mechanism, and an installation gap for accommodating the connecting plate is provided between the first fixing plate and the second fixing plate, and the opposite sides of the connecting plate are respectively fitted with the first fixing plate and the second fixing plate; the driving rod and the sleeve member are coaxially arranged, and the sleeve member can rotate relative to the driving rod; the first end of the driving rod is connected to the driving end of the displacement driving device, and the second end of the driving rod extends to the installation gap and is fixedly connected to the connecting plate.

[0010] In one embodiment, a guide rail is provided at the second end of the main blade, and one side of the guide rail for supporting the sleeve is arranged in an arc shape; the sleeve can slide and rotate relative to the guide rail. In one embodiment, the sleeve member is provided with a first detection ring and a second detection ring along its axial direction, and the guide rail member is provided with a displacement sensor, which is electrically connected to the displacement drive device; when the blade assembly switches to the first form, the first detection ring is electrically connected to the displacement sensor; when the blade assembly switches to the second form, the second detection ring is electrically connected to the displacement sensor.

[0011] In one embodiment, the rotation drive mechanism is arranged inside the sleeve member; the rotation drive mechanism includes a rotation drive device, a drive shaft and a plurality of drive rings, each of the drive rings corresponds one-to-one to the blade, and the drive ring is connected to the blade through a connecting member; the drive shaft is coaxially arranged with the sleeve member; the first end of the drive shaft is connected to the drive end of the rotation drive device, and the second end of the drive shaft is provided with a plurality of outwardly protruding drive members along its axial direction, each of the drive members corresponds one-to-one to the drive ring; the drive ring is sleeved on the drive member; the drive member is used to drive the drive ring to rotate so that the blade rotates relative to the sleeve member, thereby switching between the first form and the second form; and the sleeve member is provided with a plurality of slotted portions, each of the slotted portions corresponds one-to-one to the blade, and the connecting member is slidably connected to the slotted portion.

[0012] In one embodiment, the driving member is provided with a recessed portion along its circumference, and a protrusion is provided on the inner side of the driving ring, and the protrusion is arranged in the recessed portion; and the circumferential lengths of the recessed portion of each of the driving members are inconsistent with each other, so that when the driving shaft rotates a certain angle, the rotation angle corresponding to each of the blades is inconsistent with each other.

[0013] In one embodiment, a mating surface is provided on the side of the blade for fitting with another blade, the mating surface is inclined, and the inclined surface of the mating surface faces the rotation direction of the blade assembly switching from the second form to the first form.

[0014] In one embodiment, a limiting plate is symmetrically provided at the second end of the main blade, and a displacement gap is provided between the two limiting plates for the sliding of the sleeve member and the blade array; when the blade assembly switches to the first form, the two limiting plates are fitted and fixed on opposite sides of the blade array.

[0015] To achieve the above objectives, the present invention provides a wind turbine generator set, which includes the blade and hub connection structure as described above.

[0016] The technical solution of the present invention is to respectively provide an insert and an insertion cavity in the blade structure and the hub, and utilize the insertion connection between the insert and the insertion cavity to realize a detachable connection between the blade structure and the hub; at the same time, on the one hand, a first magnetic part and a second magnetic part are respectively provided in the insert and the insertion cavity, wherein the first magnetic part is magnetically connected to the second magnetic part; on the other hand, clamping mechanisms are respectively provided on opposite sides of the interior of the insertion cavity, and the clamping drive device is utilized to drive the clamping plate toward the insert so that the insert is clamped and fixed between the two clamping plates; the above two fixing methods (magnetic fixing and clamping fixing) are used to further enhance the connection firmness between the blade structure and the hub to ensure that the two are not prone to loosening, thereby avoiding the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of an embodiment of the blade and hub connection structure provided by the present invention; Figure 2 A schematic diagram of the blade structure in one embodiment of the blade-hub connection structure provided by the present invention (the blade assembly is switched to the first form); Figure 3 A second structural diagram of the blade structure in an embodiment of the blade-hub connection structure provided by the present invention (the blade assembly is switched to the second configuration); Figure 4 A schematic structural diagram of a blade assembly in an embodiment of a blade-hub connection structure provided by the present invention; Figure 5 An exploded schematic diagram of the structure of the blade-hub connection structure provided by the present invention; Figure 6 A schematic diagram of the internal structure of a blade assembly in an embodiment of the blade-hub connection structure provided by the present invention; Figure 7 The second schematic diagram of the internal structure of the blade assembly in the first embodiment of the blade and hub connection structure provided by the present invention; Figure 8 for Figure 7 The A-direction, B-direction and C-direction sectional views (the A-direction sectional view corresponds to blade A, the B-direction sectional view corresponds to blade B, and the C-direction sectional view corresponds to blade C) (the upper picture is the first form, and the lower picture is the second form).

[0019] Description of reference numerals: 100, main blade; 110, guide rail; 111, displacement sensor; 120, limit plate; 200, blade assembly; 210, sleeve; 211, first fixing plate; 212, second fixing plate; 213, first detection ring; 214, second detection ring; 215, slot; 220, blade; 221, mating surface; 230, blade array; 300, hub; 310, insertion cavity; 320, second magnetic member; 330, clamping Mechanism; 331, clamping drive device; 332, clamping plate; 400, displacement drive mechanism; 410, displacement drive device; 420, drive rod; 430, connecting plate; 500, rotation drive mechanism; 510, rotation drive device; 520, drive shaft; 530, drive ring; 531, protrusion; 540, connecting member; 550, drive member; 551, recessed portion; 600, blade structure; 610, insert; 620, first magnetic member; The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the description is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, it should be noted that the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] Typically, a detachable connection is used between the hub and blade structure to facilitate long-distance transportation of wind turbines. However, in existing technologies, the connection between the hub and blade structure is weak. Over extended operation of the wind turbine, the connection can become loose, causing the blade structure to detach from the hub and potentially lead to safety accidents.

[0024] In order to solve the above technical problems, the present invention proposes a blade and hub connection structure.

[0025] See also Figures 1 to 3 In one embodiment of the present invention, the blade-hub connection structure is applied to a wind turbine generator set, which includes a hub 300 and at least two blade structures 600; Specifically, the blade and hub connection structure includes: an insert 610 is provided at the end of the blade structure 600, and the hub 300 is provided with an insertion cavity 310 for the insert 610 to be engaged and connected, wherein the insert 610 is provided with a first magnetic part 620, and a second magnetic part 320 is provided inside the insertion cavity 310, and the first magnetic part 620 and the second magnetic part 320 are magnetically connected; and, clamping mechanisms 330 are respectively provided on two opposite sides of the inside of the insertion cavity 310, each clamping mechanism 330 includes a clamping drive device 331 and a clamping plate 332, and the clamping drive device 331 is used to drive the clamping plate 332 toward the insert 610 so that the insert 610 is clamped and fixed between the two clamping plates 332.

[0026] The technical solution of the present invention is to respectively provide an insert 610 and an insertion cavity 310 in the blade structure 600 and the hub 300, and utilize the insertion connection between the insert 610 and the insertion cavity 310 to realize a detachable connection between the blade structure 600 and the hub 300; at the same time, on the one hand, a first magnetic member 620 and a second magnetic member 320 are respectively provided in the insert 610 and the insertion cavity 310, wherein the first magnetic member 620 is magnetically connected to the second magnetic member 320; on the other hand, clamping mechanisms 330 are respectively provided on opposite sides of the interior of the insertion cavity 310, and a clamping drive device 331 is utilized to drive the clamping plate 332 toward the insert 610 so that the insert 610 is clamped and fixed between the two clamping plates 332; the above two fixing methods (magnetic fixing and clamping fixing) are used to further enhance the connection firmness between the blade structure 600 and the hub 300 to ensure that the two are not prone to loosening, thereby avoiding the occurrence of safety accidents.

[0027] It can be understood that accommodating cavities are respectively provided on opposite sides of the interior of the insertion cavity 310, the clamping mechanism 330 is provided in the accommodating cavity, and the accommodating cavity has a movable space for the clamping plate 332 to slide, so that the clamping plate 332 can be moved in position under the drive of the clamping drive device 331, so as to perform clamping and non-clamping operations on the insert 610; that is, when the blade structure 600 and the hub 300 are assembled, the clamping plate 332 performs a clamping operation on the insert 610; when the blade structure 600 and the hub 300 are disassembled, the clamping plate 332 performs a non-clamping operation on the insert 610.

[0028] As a preferred solution of the above embodiment, refer to Figures 2 to 3 The blade structure 600 includes a main blade 100 and a sub-blade assembly 200. The first end of the main blade 100 is connected to the hub 300. Specifically, an insert 610 is provided at the first end of the main blade 100. The first end of the main blade 100 is inserted and connected to the insertion cavity 310 of the hub 300 through the insert 610. The sub-blade assembly 200 includes a sleeve 210 and at least three sub-blades 220. The sleeve 210 is connected to the second end of the main blade 100. The sub-blade assembly 200 can be switched to a first form or a second form. When the ambient wind speed is greater than or equal to a preset value, the blade assembly 200 switches to the first state; at this time, at least three blades 220 are arranged in a straight line along the width direction of the main blade 100, and two adjacent blades 220 are attached to each other to form a blade array 230. The blade array 230 extends along the length direction of the main blade 100; When the ambient wind speed is lower than the preset value, the blade assembly 200 switches to the second form; at this time, at least three blades 220 are distributed in a ring at equal distances around the axis of the sleeve member 210; at least three blades 220 can drive the sleeve member 210 to rotate relative to the main blade 100 under wind drive to generate wind power.

[0029] This arrangement, considering the relatively large blade structure of conventional wind turbines, can effectively capture wind energy at high wind speeds. However, due to the large inertia of the blade structure, the blade structure lacks sufficient driving force to overcome its static inertia at low wind speeds, making it difficult to activate the blade structure and drive the hub to rotate. This results in the wind turbine being unable to operate effectively in low wind speeds, significantly limiting its power generation efficiency.

[0030] Based on the above reasons, the blade structure 600 in this embodiment is composed of a main blade 100 and a sub-blade assembly 200, wherein the sub-blade assembly 200 can be switched to a first form or a second form according to the ambient wind speed; it can be understood that when the ambient wind speed is greater than or equal to a preset value, that is, a high wind speed environment, the sub-blade assembly 200 is switched to the first form to form a sub-blade array 230 extending along the length direction of the main blade 100, so that the main blade 100 and the sub-blade assembly 200 are combined to form an integral structure, which can maximize the capture of wind energy and improve power generation efficiency; and when the ambient wind speed is lower than the preset value, that is, a low wind speed environment, the sub-blade assembly 200 is switched to the second form, at least the sub-blades 220 are distributed in a ring around the axis of the sleeve member 210. Since the structural volume of the sub-blades 220 is small and its static inertia is correspondingly small, even in a low wind speed environment, at least three blades can drive the sleeve member 210 to rotate relative to the main blade 100 to form a small wind turbine generator set for wind power generation, thereby solving the problem of low power generation efficiency of existing wind turbine generator sets under low wind speed conditions. Through the above structure, it is possible to achieve that the wind turbine generator set can still maintain a certain power generation efficiency regardless of high wind speed environment or low wind speed environment, which has significant practicality and innovation.

[0031] In this embodiment, the number of blades 220 is set to three. It can be understood that those skilled in the art can also set the number of blades 220 to two or more than four based on their understanding of the technical solution of this application, which should also fall within the scope of protection of this application.

[0032] The value of the ambient wind speed can be measured by setting a wind speed sensor, or the rotation rate of the hub 300 can be used as a criterion for determining the ambient wind speed. It is understandable that when the rotation rate of the main blades 100 is higher than the preset rate, it indicates that the ambient wind speed is relatively high, and the larger main blades 100 can be smoothly driven to rotate the hub 300; and when the rotation rate of the main blades 100 is lower than the preset rate, it indicates that the ambient wind speed is relatively low, and the larger main blades 100 cannot be smoothly driven to rotate the hub 300; thus, the rotation rate of the hub 300 is used as a basis for determining the ambient wind speed. It should be noted that when the blade assembly 200 switches to the second state to generate wind power, the main blades 100 can still rotate the hub 300 through the wind. When it is detected that the rotation rate of the hub 300 reaches the preset rate, the blade assembly 200 is automatically switched back to the first state through the internal control program, thereby achieving automated operation of wind power generation without manual intervention.

[0033] As a preferred solution of the above embodiment, the blade assembly 200 includes a displacement drive mechanism 400, which is used to drive the sleeve member 210 to displace along the width direction of the main blade 100 so that the blade array 230 moves to the front end area of ​​the main blade 100; such a setting is taken into account that when the blade assembly 200 switches to the second form, at least three blades 220 can drive the sleeve member 210 to rotate relative to the main blade 100 under wind drive to perform wind power generation. In the process, the circumferential area of ​​the blade 220 requires sufficient activity space for its blade 220 to rotate around the axis of the sleeve member 210; based on the above reasons, this embodiment provides a displacement drive mechanism 400 to drive the sleeve member 210 to displace along the width direction of the main blade 100. By moving the blade array 230 to the front end area of ​​the main blade 100, at this time, there is no obstruction such as the main blade 100 in the circumferential area of ​​at least three blades 220, thereby ensuring the smooth implementation of the technical solution of this application.

[0034] There are many specific structures of the displacement drive mechanism 400. In this embodiment, refer to Figures 4 to 7The displacement driving mechanism 400 includes a displacement driving device 410, a driving rod 420 and a connecting plate 430; a first fixing plate 211 and a second fixing plate 212 are provided at one end of the sleeve member 210 facing the displacement driving mechanism 400, and an installation gap for accommodating the connecting plate 430 is provided between the first fixing plate 211 and the second fixing plate 212, and the opposite sides of the connecting plate 430 are respectively fitted with the first fixing plate 211 and the second fixing plate 212; the driving rod 420 is coaxially arranged with the sleeve member 210, and the sleeve member 210 can rotate relative to the driving rod 420; the first end of the driving rod 420 is connected to the driving end of the displacement driving device 410, and the second end of the driving rod 420 extends to the installation gap and is fixedly connected to the connecting plate 430. In this arrangement, the drive rod 420 is driven by the displacement drive device 410, and then the connecting plate 430 and the sleeve member 210 are driven to move along the width direction of the main blade 100, thereby achieving precise control of the position of the sub-blade array 230 and ensuring that the sub-blade array 230 accurately moves to the corresponding positions of the first form and the second form. By arranging the connecting plate 430 in the installation gap formed by the first fixing plate 211 and the second fixing plate 212, the driving rod 420 drives the connecting plate 430 to move, and the connecting plate 430 drives the sleeve member 210 to move forward and backward by pushing the first fixing plate 211 and the second fixing plate 212; at the same time, the driving rod 420, the sleeve member 210 and the circular structure connecting plate 430 are coaxially arranged. When the sleeve member 210 rotates to generate wind power, the displacement drive mechanism 400 can always maintain connection with the sleeve member 210 through the connecting plate 430, ensuring that the sleeve member 210 can only be limited to the second end of the main blade 100 for rotational movement, avoiding separation of the blade assembly 200 and the main blade 100, and ensuring the smooth implementation of the technical solution of this application.

[0035] As a preferred method, refer to Figures 6 and 7 A guide rail member 110 is provided at the second end of the main blade 100, and the guide rail member 110 is arranged in an arc shape on one side for supporting the sleeve member 210; the sleeve member 210 can slide and rotate relative to the guide rail member 110; in this way, the arc design of the guide rail member 110 can guide the sleeve member 210 to slide and rotate smoothly, ensuring that the movement trajectory of the blade assembly 200 is accurate when switching forms and rotating for power generation.

[0036] Further, refer to Figures 6 and 7The sleeve member 210 is provided with a first detection ring 213 and a second detection ring 214 along its axial direction. The guide member 110 is provided with a displacement sensor 111, which is electrically connected to the displacement drive device 410. When the blade assembly 200 switches to the first form, the first detection ring 213 is electrically connected to the displacement sensor 111; when the blade assembly 200 switches to the second form, the second detection ring 214 is electrically connected to the displacement sensor 111. In this configuration, the displacement sensor 111 cooperates with the first detection ring 213 / the second detection ring 214 to detect the position change of the sleeve member 210 in real time, providing an accurate feedback signal to the displacement drive device 410, thereby achieving precise positioning control. It can be understood that since the first detection ring 213 and the second detection ring 214 are annular structures, no matter to which angle the sleeve member 210 rotates, the displacement sensor 111 can still effectively capture the position of the first detection ring 213 / the second detection ring 214, thereby ensuring the smooth implementation of the technical solution of this application.

[0037] As a preferred embodiment of the above embodiment, the blade assembly 200 includes a rotary drive mechanism 500, which is used to drive at least three blades 220 to switch between the first and second configurations. This configuration ensures smooth implementation of the technical solution of the present application by providing the rotary drive mechanism 500 to drive the blades 220 to switch between the first and second configurations.

[0038] There are many specific structures of the rotation drive mechanism 500. In this embodiment, refer to Figures 4 to 7The rotary drive mechanism 500 is arranged inside the sleeve member 210; the rotary drive mechanism 500 includes a rotary drive device 510, a drive shaft 520 and a plurality of drive rings 530, each drive ring 530 corresponds to a blade 220, and the drive ring 530 is connected to the blade 220 through a connecting member 540; the drive shaft 520 is coaxially arranged with the sleeve member 210; the first end of the drive shaft 520 is connected to the drive end of the rotary drive device 510, and the second end of the drive shaft 520 is provided with a plurality of external protrusions along its axial direction. The drive members 550 are arranged such that each drive member 550 corresponds to a drive ring 530; the drive ring 530 is sleeved on the drive members 550; the drive members 550 are used to drive the drive ring 530 to rotate, thereby causing the blades 220 to rotate relative to the sleeve member 210, thereby switching between the first and second forms; and the sleeve member 210 is provided with a plurality of slots 215, each slot 215 corresponding to a blade 220, and the connecting member 540 is slidably connected to the slots 215. With this arrangement, the drive ring 530 is driven to rotate by the drive shaft 520, thereby causing each blade 220 to rotate relative to the sleeve member 210, thereby achieving rapid switching of the blades 220 between the first and second forms. This structural design ensures smooth and rapid operation of the blades 220 during switching, thereby improving the operating efficiency of the wind turbine generator set. At the same time, each drive ring 530 corresponds one-to-one with a blade 220, and the drive ring 530 is sleeved on the drive member 550. This one-to-one drive relationship enables precise control of each blade 220, ensuring the accurate position and angle of the blade 220 when switching forms, further improving the operating accuracy of the blade structure 600. The connecting member 540 is slidably connected to the slotted portion 215 of the sleeve member 210. On the one hand, this design provides sufficient space for the rotational movement of the blade 220, avoiding the technical solution from being unable to be smoothly implemented due to structural interference; on the other hand, the slotted portion 215 can serve as a movement guide for the connecting member 540, ensuring that the blade 220 moves along the predetermined path.

[0039] Specifically, the driving member 550 is provided with a recessed portion 551 along its circumference, and a raised portion 531 is provided on the inner side of the driving ring 530, with the raised portion 531 being disposed within the recessed portion 551. Furthermore, the circumferential lengths of the recessed portions 551 of each driving member 550 are mutually inconsistent, so that when the driving shaft 520 rotates a certain angle, the corresponding rotation angles of each blade 220 are mutually inconsistent. By providing recessed portions 551 of different circumferential lengths on the driving member 550 and embedding the raised portions 531 of the driving ring 530 therein, differentiated rotational angle control of the blades 220 when switching configurations is achieved. Consequently, when the driving shaft 520 rotates a certain angle, the corresponding rotation angles of each blade 220 are mutually inconsistent, ultimately forming a configuration in which multiple blades 220 are equidistantly distributed annularly around the axis of the sleeve 210. At the same time, the complexity of setting up a separate rotation drive mechanism 500 for each blade 220 is avoided. This design significantly reduces the number and complexity of parts and components, simplifies the mechanical structure of the entire blade structure 600, and the simplification of the blade structure 600 also directly leads to a reduction in manufacturing costs, which is conducive to enhancing the market competitiveness of the product.

[0040] For easier understanding, refer to the attached Figures 7 and 8 In this application, three blades 220 are provided, which are defined as blade A, blade B and blade C respectively. Correspondingly, there are also three driving members 550 and driving rings 530, which are defined as driving member A, driving member B and driving member C respectively, as well as driving rings A, driving ring B and driving ring C. Among them, blade A, driving member A and driving ring A are corresponding to each other (i.e., the A-direction cross-sectional view in the accompanying drawings), blade B, driving member B and driving ring B are corresponding to each other (i.e., the B-direction cross-sectional view in the accompanying drawings), and blade C, driving member C and driving ring C are corresponding to each other (i.e., the C-direction cross-sectional view in the accompanying drawings). Thus Figures 7 and 8 As can be seen in FIG, when the blade assembly 200 switches from the first state to the second state, that is, when the rotation drive device 510 drives the drive shaft 520 to rotate 240°; As attached Figure 8 As shown in the cross-sectional view in the direction of A in FIG, the rotation angle of the outermost blade A is 0°, that is, the driving member A does not need to drive the driving ring A to rotate. In this case, the driving member A does not need to be provided with the recessed portion 551, and the driving ring A does not need to be provided with the raised portion 531. As attached Figure 8 As shown in the cross-sectional view in the direction B, the rotation angle of the blade B located in the middle is 240°, that is, the driving member B needs to drive the driving ring B to rotate 240°, which is the same as the rotation angle of the driving shaft 520. Therefore, the recessed portion 551 of the driving member B and the raised portion 531 of the driving ring B are exactly fitted together to ensure that when the driving shaft 520 drives the driving member B to rotate 240°, the driving ring B can also rotate 240° to ensure that the blade B rotates to the 240° position.

[0041] As attached Figure 8 As shown in the C-direction sectional view in the figure, the rotation angle of the innermost blade C is 120°, that is, the driving member C needs to drive the driving ring C to rotate 120°, which is less than the rotation angle of the driving shaft 520. Therefore, the circumferential length of the recessed portion 551 of the driving member C needs to make up for the window rotation angle, so the circumferential length (i.e. arc length) of the recessed portion 551 is 120°; thus, when the driving shaft 520 rotates 240°, the driving member C needs to first rotate 120°, and then the side portions of the recessed portion 551 and the raised portion 531 fit together, so that the cooperation between the recessed portion 551 and the raised portion 531 drives the driving ring 530 to rotate 120°, so as to ensure that the blade C rotates to the 120° position.

[0042] Through the above structure, when the rotary drive device 510 drives the drive shaft 520 to rotate °, the three blades 220 rotate 0°, 120° and 240° around the sleeve member 210 respectively, so that the three blades 220 form an equidistant annular distribution around the axis of the sleeve member 210, so as to ensure the smooth implementation of the technical solution of this application.

[0043] It can be understood that when the number of blades 220 is two or more than four, the above principle can also be used to set the circumferential length of the recessed portion 551 of the driving member 550 accordingly, so that there is a corresponding window rotation space for the raised portion 531 of the driving ring 530, so that the multiple blades 220 can finally form a circular distribution with equal distances around the axis of the sleeve member 210; it should also fall within the scope of protection of this application.

[0044] As a preferred solution of the above embodiment, refer to Figures 2 to 3 , a mating surface 221 is provided on the side of a blade 220 for fitting with another blade 220. The mating surface 221 is tilted, and the tilted surface of the mating surface 221 faces the rotation direction of the blade assembly 200 when switching from the second form to the first form. In this way, by providing the tilted mating surface 221 on the side of the blade 220, two adjacent blades 220 can fit more closely when switching from the second form to the first form, forming a more stable blade array 230; at the same time, when the blade assembly 200 switches to the second form for wind power generation, its tilted mating surface 221 is designed in accordance with aerodynamic principles, can effectively guide the airflow through each blade 220, reduce airflow resistance, further optimize the aerodynamic performance of the wind turbine blades, and improve the overall operating efficiency of the wind turbine generator set.

[0045] As a preferred solution of the above embodiment, refer to Figures 2 to 3The second end of the main blade 100 is symmetrically provided with a limit plate 120. A displacement gap is provided between the two limit plates 120 for the sleeve member 210 and the blade array 230 to slide. When the blade assembly 200 switches to the first configuration, the two limit plates 120 are fixed to opposite sides of the blade array 230. With this configuration, the limit plates 120 can effectively limit the positional deviation of the sleeve member 210 and the blade array 230 during the sliding process, ensuring that the displacement drive mechanism 400 drives the blade assembly 200 to switch between the first and second configurations smoothly and accurately, avoiding structural damage or operational failure caused by positional deviation. At the same time, when the blade assembly 200 switches to the second configuration, the sleeve member 210 still partially remains between the two limit plates 120. The combined action of the two limit plates 120 ensures that the sleeve member 210 can only rotate around its axis when rotating, without any left-right swaying or deviation, ensuring that the blade assembly 200 can be stably mounted on the second end of the main blade 100 during wind power generation.

[0046] When the blade assembly 200 switches to the first form, the two limit plates 120 are fitted and fixed on opposite sides of the blade array 230, which is beneficial to enhancing the structural strength of the blade array 230 and improving the overall stability of the blade structure 600, so that it can better withstand the effects of wind and various loads during operation, and avoid the shaking of each blade 220 due to the action of wind.

[0047] The present invention also discloses a wind turbine generator set including the blade-hub connection structure of any of the aforementioned embodiments. For the specific structure of the blade-hub connection structure, reference can be made to the aforementioned embodiments. Because this wind turbine generator set utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects provided by the technical solutions of the aforementioned embodiments, and therefore will not be further elaborated upon here.

[0048] It should be noted that the blade and hub connection structure disclosed in the present invention and other contents of the wind turbine generator set are prior art and will not be described in detail here.

[0049] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any direct / indirect application of the present invention in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A blade-hub connection structure, applied to a wind turbine generator set, wherein the wind turbine generator set comprises a hub and at least two blade structures; characterized in that: An insert is provided at the end of the blade structure, and the hub is provided with an insertion cavity for the insert to be engaged and connected, wherein the insert is provided with a first magnetic member, and a second magnetic member is provided inside the insertion cavity, and the first magnetic member is magnetically connected to the second magnetic member; In addition, clamping mechanisms are respectively provided on opposite sides of the interior of the insertion cavity, and each of the clamping mechanisms includes a clamping drive device and a clamping plate. The clamping drive device is used to drive the clamping plate toward the insert so that the insert is clamped and fixed between the two clamping plates.

2. The blade-hub connection structure according to claim 1, wherein: The blade structure includes a main blade and a sub-blade assembly, wherein the first end of the main blade is connected to the hub; the sub-blade assembly includes a sleeve and at least three sub-blades, wherein the sleeve is connected to the second end of the main blade; the sub-blade assembly can be switched to a first configuration or a second configuration; When the ambient wind speed is greater than or equal to a preset value, the blade assembly switches to the first state; At this time, at least three of the sub-blades are arranged in a straight line along the width direction of the main blade, and two adjacent sub-blades are attached to each other to form a sub-blade array, and the sub-blade array extends along the length direction of the main blade; When the ambient wind speed is lower than a preset value, the sub-blade assembly switches to the second form; at this time, at least three of the sub-blades are distributed in a ring at equal distances around the axis of the sleeve member; at least three of the sub-blades can drive the sleeve member to rotate relative to the main blade under wind drive to generate wind power.

3. The blade-hub connection structure according to claim 2, wherein: The sub-blade assembly includes a displacement drive mechanism, which is used to drive the sleeve member to displace along the width direction of the main blade so as to move the sub-blade array to the front end area of ​​the main blade; Furthermore, the blade assembly includes a rotation drive mechanism, which is used to drive at least three of the blades to switch between the first form and the second form.

4. The blade-hub connection structure according to claim 3, wherein: The displacement driving mechanism includes a displacement driving device, a driving rod and a connecting plate; a first fixing plate and a second fixing plate are provided at one end of the sleeve member facing the displacement driving mechanism, and an installation gap for accommodating the connecting plate is provided between the first fixing plate and the second fixing plate, and opposite sides of the connecting plate are respectively fitted with the first fixing plate and the second fixing plate; the driving rod and the sleeve member are coaxially arranged, and the sleeve member can rotate relative to the driving rod; the first end of the driving rod is connected to the driving end of the displacement driving device, and the second end of the driving rod extends to the installation gap and is fixedly connected to the connecting plate.

5. The blade-hub connection structure according to claim 3, wherein: A guide rail is provided at the second end of the main blade, and one side of the guide rail for supporting the sleeve is arranged in an arc shape; the sleeve can slide and rotate relative to the guide rail; In addition, the sleeve member is provided with a first detection ring and a second detection ring along its axial direction, and the guide rail member is provided with a displacement sensor, which is electrically connected to the displacement drive device; when the blade assembly switches to the first form, the first detection ring is electrically connected to the displacement sensor; when the blade assembly switches to the second form, the second detection ring is electrically connected to the displacement sensor.

6. The blade-hub connection structure according to claim 3, wherein: The rotary drive mechanism is arranged inside the sleeve member; the rotary drive mechanism comprises a rotary drive device, a drive shaft and a plurality of drive rings, each of the drive rings corresponds to the blades one-to-one, and the drive ring is connected to the blades through a connecting member; the drive shaft is coaxially arranged with the sleeve member; the first end of the drive shaft is connected to the drive end of the rotary drive device, and the second end of the drive shaft is provided with a plurality of convex drive members along its axial direction, each of the drive members corresponds to the drive ring one-to-one; the drive ring is sleeved on the drive member; the drive member is used to drive the drive ring to rotate, so that the blades rotate relative to the sleeve member, thereby switching between the first form and the second form; Furthermore, the sleeve member is provided with a plurality of slotted portions, each of the slotted portions corresponds to the blades one by one, and the connecting member is slidably connected to the slotted portions.

7. The blade-hub connection structure according to claim 6, characterized in that: The driving member is provided with a recessed portion along its circumference, and a protrusion is provided on the inner side of the driving ring, and the protrusion is arranged in the recessed portion; and the circumferential lengths of the recessed portion of each driving member are inconsistent with each other, so that when the driving shaft rotates a certain angle, the rotation angle corresponding to each of the blades is inconsistent with each other.

8. The blade-hub connection structure according to claim 2, wherein: The side of the blade for fitting with another blade is provided with a mating surface, the mating surface is inclined, and the inclined surface of the mating surface faces the rotation direction of the blade assembly switching from the second form to the first form.

9. The blade-hub connection structure according to claim 2, wherein: A limiting plate is symmetrically provided at the second end of the main blade, and a displacement gap is provided between the two limiting plates for sliding of the sleeve member and the blade array; when the blade assembly switches to the first form, the two limiting plates are fitted and fixed on opposite sides of the blade array.

10. A wind turbine generator set, characterized in that: The wind turbine generator set includes the blade and hub connection structure according to any one of claims 1 to 9.

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