Wind generating set

Abstract

The utility model provides a wind generating set. The wind generating set comprises a hub; the blades are mounted on the hub; the variable pitch bearing is arranged at the joint of the hub and the blades and comprises an inner ring and an outer ring which are rotationally connected, the inner ring is connected with the blades, and the outer ring is connected with the hub; and the protection mechanism is arranged to surround the blades, one end of the protection mechanism is connected with the blades in a sealed mode, the other end of the protection mechanism is tightly pressed on the end face, close to the blades, of the outer ring, and a protection space is defined by the protection mechanism and the blades. According to the wind generating set, by arranging the protection mechanism, the variable-pitch bearing blade side sealing material can be sealed in the protection space, so that protection of the variable-pitch bearing blade side sealing can be achieved even if a flow guide cover is omitted, and the variable-pitch bearing failure further caused by the variable-pitch bearing sealing failure is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power, in particular to a wind power generator set. Background Art

[0002] With the continuous optimization of wind turbine generator sets, they are gradually developing towards units without shrouds. Removing the impeller shroud of wind turbine generator sets can reduce the manufacturing cost of wind turbine generator sets. However, after removing the shroud, the blade side seal of the variable pitch bearing will be directly exposed to the external environment, and the sealing material is rubber, which will cause rapid failure when exposed to the external environment. After the sealing material fails, ultraviolet rays, rain, and dust will enter the interior of the variable pitch bearing through the seal, accelerating the corrosion of the variable pitch bearing and reducing the service life of the wind turbine generator set. Utility Model Content

[0003] One object of the utility model is to provide a wind turbine generator set, which can protect the blade side seal of the pitch bearing even if the guide cover is removed, thereby avoiding the failure of the pitch bearing seal and further causing the pitch bearing failure.

[0004] Another object of the utility model is to provide a wind turbine generator set, wherein the protection mechanism of the wind turbine generator set will not hinder an operator from operating a fastener connecting a pitch bearing and a hub.

[0005] Another object of the utility model is to provide a wind turbine generator set, wherein the protection mechanism of the wind turbine generator set is convenient for manufacture and transportation.

[0006] Another object of the utility model is to provide a wind turbine generator set, wherein the protection mechanism of the wind turbine generator set is easy to maintain.

[0007] According to one aspect of the utility model, a wind turbine generator set is provided, which includes: a hub; blades installed on the hub; a pitch bearing arranged at the junction of the hub and the blades, including an inner ring and an outer ring rotatably connected, the inner ring is connected to the blades, and the outer ring is connected to the hub; a protective mechanism is arranged to surround the blades, one end of the protective mechanism is sealingly connected to the blades, and the other end of the protective mechanism is pressed against the end face of the outer ring close to the blades, and the protective mechanism and the blades form a protective space.

[0008] Optionally, the outer ring and the wheel hub are connected to each other via a first fastener, and the position where the other end of the protection mechanism is pressed against the end surface of the outer ring is located radially inward of the first fastener.

[0009] Optionally, the protective mechanism includes an inner cover and a sealing ring surrounding the blade, at least a portion of the inner cover is configured to fit the root of the blade, one end of the sealing ring is connected to the inner cover, and the other end of the sealing ring is pressed against the end face of the outer ring, and the sealing ring is separated from the root of the blade by a predetermined distance to form the protective space.

[0010] Optionally, the first part of the inner cover is fitted with the root of the blade, the second part of the inner cover extends radially outward from the first part of the inner cover along the blade, the first part of the sealing ring is connected to the second part of the inner cover, and the second part of the sealing ring extends from the first part of the sealing ring toward the outer ring and is pressed against the end face of the outer ring.

[0011] Optionally, the first portion of the sealing ring is overlapped with the second portion of the inner cover, and the first portion of the sealing ring is arranged on the upper side of the second portion of the inner cover.

[0012] Optionally, the first portion of the sealing ring is glued together with the second portion of the inner cover.

[0013] Optionally, the protection mechanism further includes a pressure plate and a pre-tightening plate surrounding the blade, the pressure plate is arranged on the first part of the sealing ring, and the pre-tightening plate is arranged below the second part of the inner cover. The protection mechanism further includes a second fastener, which connects the pressure plate, the first part of the sealing ring, the second part of the inner cover and the pre-tightening plate in sequence.

[0014] Optionally, each of the inner cover, the pressure plate and the preload plate includes a plurality of arc-shaped plates connected to each other along a circumferential direction of the blade.

[0015] Optionally, the first portion of the sealing ring is spaced apart from the first portion of the inner cover in a radial direction of the blade, and an exhaust hole exposed outward is formed between the first portion of the inner cover and the second portion of the inner cover.

[0016] Optionally, the inner cover is made of fiberglass, and the sealing ring is made of rubber.

[0017] According to the wind turbine generator set of the utility model, by setting a protection mechanism, the sealing material on the blade side of the pitch bearing can be sealed in the protection space, thereby preventing ultraviolet rays, rain, sand and dust from contacting the sealing structure and causing seal failure. Therefore, even if the guide cover is removed, the protection of the blade side seal of the pitch bearing can be achieved, avoiding the failure of the pitch bearing seal and further causing the failure of the pitch bearing.

[0018] The protective mechanism of the wind turbine generator set according to the utility model will not hinder operators from operating the fasteners connecting the pitch bearing and the hub.

[0019] The protective mechanism of the wind turbine generator set according to the utility model comprises an inner cover and a sealing ring which are connected to each other, thus facilitating the manufacture and transportation of the protective mechanism.

[0020] According to the utility model, the inner cover and the sealing ring of the protective mechanism of the wind turbine generator set are detachably connected, so it is convenient to manufacture and transport.

[0021] The protection mechanism of the wind turbine generator set according to the utility model comprises a pressure plate and a pre-tightening plate, which can improve the overall rigidity of the protection mechanism, thereby improving the stability and reliability of the protection mechanism.

[0022] According to the utility model, the protection mechanism of the wind turbine generator set comprises an exhaust hole, so that the inside and outside of the protection mechanism maintain a consistent atmospheric pressure, thereby improving stability and preventing rainwater from accumulating in the protection space. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other purposes, features and advantages of the present invention will become more apparent through the following detailed description in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a schematic diagram of a part of a wind turbine generator set according to an embodiment of the utility model;

[0025] Figure 2 yes Figure 1 An enlarged view of part P in FIG.

[0026] Figure 3 is a schematic diagram of a protection mechanism according to an embodiment of the utility model;

[0027] Figure 4 is a three-dimensional diagram of a protection mechanism according to an embodiment of the utility model;

[0028] Figure 5 is an exploded schematic diagram of a protection mechanism according to an embodiment of the utility model;

[0029] Figure 6 It is a three-dimensional diagram of a protection mechanism according to another embodiment of the utility model.

[0030] Explanation of the symbols in the drawings: 100 - wind turbine generator set, 110 - hub, 120 - blades, 121 - root, 130 - pitch bearing, 131 - inner ring, 132 - outer ring, 132a - end face, 140 - protection mechanism, 141 - inner cover, 141a - first part of the inner cover, 141b - second part of the inner cover, 141c - exhaust hole, 142 - sealing ring, 142a - first part of the sealing ring, 142b - second part of the sealing ring, 143 - pressure plate, 144 - pre-tightening plate, 145 - second fastener, 150 - protection space, 160 - first fastener, 170 - sealing structure. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art. For example, "connection" may be a direct connection or an indirect connection. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0033] As described in the background technology section, as a cost-reduction measure for wind turbines, the impeller shroud of the wind turbine is eliminated. However, after the shroud is eliminated, the blade side seal of the variable pitch bearing will be directly exposed to the external environment, and the sealing material is rubber, which will fail quickly when exposed to the external environment. After the sealing material fails, ultraviolet rays, rain, and dust will enter the interior of the variable pitch bearing through the seal, accelerating the corrosion of the variable pitch bearing and reducing the service life of the wind turbine.

[0034] In order to solve the above problems, the utility model provides a wind turbine generator set, which can protect the blade side seal of the variable pitch bearing even if the deflector is removed, so as to avoid the failure of the variable pitch bearing seal and further cause the failure of the variable pitch bearing. Hereinafter, the wind turbine generator set according to the embodiment of the utility model will be described in detail in conjunction with the accompanying drawings. In order to highlight the main invention content of the utility model, the structure related to the utility model will be mainly shown and described.

[0035] Figure 1 is a schematic diagram of a part of a wind turbine generator set according to an embodiment of the utility model, Figure 2 yes Figure 1 The enlarged view of part P in Figure 3 is a schematic diagram of a protection mechanism according to an embodiment of the utility model, Figure 4 is a three-dimensional diagram of a protection mechanism according to an embodiment of the utility model, Figure 5 It is an exploded schematic diagram of a protection mechanism according to an embodiment of the utility model.

[0036] like Figure 1 and Figure 2 As shown, a wind turbine generator set 100 according to an embodiment of the utility model may include: a hub 110; blades 120, mounted on the hub 110; a pitch bearing 130, arranged at the junction of the hub 110 and the blades 120, including an inner ring 131 and an outer ring 132 that are rotatably connected, the inner ring 131 is connected to the blades 120, and the outer ring 132 is connected to the hub 110; a protective mechanism 140, arranged to surround the blades 120, one end of the protective mechanism 140 is sealed and connected to the blades 120, and the other end of the protective mechanism 140 is pressed against an end face 132a of the outer ring 132 close to the blades 120, and the protective mechanism 140 and the blades 120 enclose a protective space 150.

[0037] Although Figure 1 Although not shown in the figure, the wind turbine generator set according to the embodiment of the utility model may also include a tower, a nacelle and a generator. The tower is installed on the wind turbine foundation, the nacelle is arranged at the top of the tower, and the generator is arranged inside or outside the nacelle. The hub 110 and the blades 120 may be called impellers, and an impeller may include a plurality of blades 120 (for example, three blades 120) mounted to the hub 110. The hub 110 is connected to the driving shaft of the generator. When the wind force acts on the impeller, the impeller will drive the rotor of the generator to rotate relative to the stator, thereby meeting the power generation requirements of the wind turbine generator set.

[0038] Since the wind direction and wind speed in the area where the wind turbine generator set is located are variable, in order to adapt to the change of wind energy, the wind turbine generator set according to the utility model can achieve variable pitch through the variable pitch bearing 130. Specifically, the variable pitch bearing 130 can be arranged at the intersection of the hub 110 and the blade 120, and can include an inner ring 131 and an outer ring 132 that are rotatably connected, the inner ring 131 is connected to the blade 120, and the outer ring 132 is connected to the hub 110. Figure 1 and Figure 2 As shown, the outer ring 132 and the hub 110 may be connected to each other via a first fastener 160 .

[0039] like Figure 2As shown, the blade side of the pitch bearing 130 can be sealed by a sealing structure 170. The sealing structure 170 is made of rubber and will fail quickly when exposed to the external environment. After the sealing structure 170 fails, ultraviolet rays, rain, and dust will enter the interior of the pitch bearing 130 from the seal, accelerating the corrosion of the pitch bearing 130 and reducing the service life of the wind turbine. According to an embodiment of the utility model, by providing a protection mechanism 140, even if the guide cover is removed, the blade side seal of the pitch bearing 130 can be protected, thereby avoiding the failure of the pitch bearing 130 seal and further causing the pitch bearing 130 to fail.

[0040] like Figure 1 and Figure 2 As shown, the protective mechanism 140 can be arranged to surround the blade 120, one end of the protective mechanism 140 is sealed and connected to the blade 120, and the other end of the protective mechanism 140 is pressed against the end surface 132a of the outer ring 132 close to the blade 120, and the protective mechanism 140 and the blade 120 enclose a protective space 150. Therefore, the protective mechanism 140 can seal the sealing structure 170 in the protective space 150, thereby preventing ultraviolet rays, rain, and dust from contacting the sealing structure 170 and causing sealing failure. Therefore, even if the guide cover is cancelled, the protection of the blade side seal of the variable pitch bearing can be achieved, and the failure of the pitch bearing seal and further causing the pitch bearing failure can be avoided.

[0041] According to an embodiment of the present invention, one end of the protective mechanism 140 can be sealed and connected to the blade 120 (for example, the root 121 of the blade 120) by bonding. According to an embodiment of the present invention, the degree of compression of the protective mechanism 140 on the end face 132a of the outer ring 132 is not specifically limited, and can be specifically determined according to design requirements (for example, sealing level). As an example, at least a portion of the protective mechanism 140 is made of rubber, for example, the portion of the protective mechanism 140 that contacts the end face 132a of the outer ring 132 is made of rubber known in the art, so the protective mechanism 140 can be in close contact with the end face 132a of the outer ring 132 through the elasticity of the rubber to ensure sealing.

[0042] According to the embodiments of the present utility model, Figure 2As shown, the position where the other end of the protection mechanism 140 is pressed against the end face 132a of the outer ring 132 is located radially inside the first fastener 160. If the position where the other end of the protection mechanism 140 is pressed against the end face 132a of the outer ring 132 is located radially outside the first fastener 160, the upper end of the first fastener 160 connecting the outer ring 132 and the hub 110 to each other will be covered by the protection mechanism 140, for example, covered in the protection space 150 described below. This is not convenient for the first fastener 160 to be repaired (for example, regular inspection, tightening), that is, during the repair, the protection mechanism 140 needs to be removed before the repair. According to an embodiment of the utility model, the position where the other end of the protective mechanism 140 is pressed against the end face 132a of the outer ring 132 is located radially inside the first fastener 160. Therefore, the protective mechanism 140 will not hinder the operator's operation of the first fastener 160 (for example, routine inspection, tightening), and the protective space 150 does not need to be removed during maintenance.

[0043] According to the embodiments of the present utility model, Figures 2 to 5 As shown, the protection mechanism 140 may include an inner cover 141 and a sealing ring 142 surrounding the blade 120, at least a portion of the inner cover 141 is arranged to fit the root 121 of the blade 120, one end of the sealing ring 142 is connected to the inner cover 141, and the other end of the sealing ring 142 is pressed against the end surface 132a of the outer ring 132, and the sealing ring 142 is separated from the root 121 of the blade 120 by a predetermined distance, thereby forming a protection space 150. According to the utility model, since the protection mechanism 140 includes the inner cover 141 and the sealing ring 142 connected to each other, it is easy to manufacture and transport.

[0044] As an example, the inner cover 141 may include a plurality of arc-shaped plates connected to each other along the circumference of the blade 120. That is, the inner cover 141 may be connected to each other along the circumference to form a ring by a plurality of arc-shaped plates (e.g., 8 arc-shaped plates). As an example, a plurality of arc-shaped plates may be separated by a predetermined gap and may be connected together by a sealing ring 142. The inner cover 141 is formed by a plurality of arc-shaped plates, which facilitates the transportation of the inner cover 141, the adjustment of the number of arc-shaped plates, and the installation. For example, the number of arc-shaped plates may be adjusted according to the size of the root 121 of the blade 120.

[0045] As an example, the material of the inner cover 141 may be glass fiber reinforced plastic known in the art, and the material of the sealing ring 142 may be rubber known in the art. Glass fiber reinforced plastic has high strength, light weight and good corrosion resistance, so using glass fiber reinforced plastic to manufacture the inner cover 141 is conducive to improving the service life of the protection mechanism 140 and reducing weight. Rubber has a certain elasticity, so using rubber to manufacture the sealing ring 142 is conducive to pressing the other end of the sealing ring 142 against the end surface 132a of the outer ring 132.

[0046] According to the embodiments of the present utility model, Figure 2 and Figure 3 As shown, the first portion 141a of the inner cover 141 may be fitted with the root 121 of the blade 120, and the second portion 141b of the inner cover 141 may extend outward from the first portion 141a of the inner cover 141 in the radial direction of the blade 120. The first portion 142a of the sealing ring 142 is connected to the second portion 141b of the inner cover 141, and the second portion 142b of the sealing ring 142 extends from the first portion 142a of the sealing ring 142 toward the outer ring 132 and is pressed against the end surface 132a of the outer ring 132.

[0047] like Figure 2 and Figure 3 As shown, the first portion 142 a of the sealing ring 142 may be overlapped with the second portion 141 b of the inner cover 141 , and the first portion 142 a of the sealing ring 142 may be disposed on the upper side of the second portion 141 b of the inner cover 141 .

[0048] As an example, the first portion 142 a of the sealing ring 142 may be glued together with the second portion 141 b of the inner cover 141 .

[0049] As another example, the first portion 142a of the sealing ring 142 can be detachably connected to the second portion 141b of the inner cover 141 by a fastener, and the sealing ring 142 can be replaced when the sealing ring 142 is worn, thereby facilitating maintenance of the protection mechanism 140. As an example, the fastening connection between the sealing ring 142 and the inner cover 141 can be achieved in the following manner.

[0050] like Figures 3 to 5 As shown, the protection mechanism 140 may further include a pressure plate 143 and a pre-tightening plate 144 surrounding the blade 120. The pressure plate 143 is disposed on the first portion 142a of the sealing ring 142, and the pre-tightening plate 144 is disposed below the second portion 141b of the inner cover 141. The protection mechanism 140 may further include a second fastener 145 (e.g., a bolt), and the second fastener 145 sequentially connects the pressure plate 143, the first portion 142a of the sealing ring 142, the second portion 141b of the inner cover 141, and the pre-tightening plate 144. For example, a plurality of second fasteners 145 may be disposed along the circumference of the blade 120, and the plurality of second fasteners 145 may be arranged according to a predetermined rule (e.g., evenly arranged or arranged in any other form).

[0051] According to the utility model, by providing the pressing plate 143 and the pre-tightening plate 144 to sandwich the inner cover 141 and the sealing ring 142 in the middle, the overall rigidity of the protection mechanism 140 can be improved, thereby improving the stability and reliability of the protection mechanism 140.

[0052] According to an embodiment of the utility model, each of the pressure plate 143 and the pre-tightening plate 144 may include a plurality of arc-shaped plates connected to each other along the circumference of the blade 120. For example, the pressure plate 143 and the pre-tightening plate 144 may be connected to form a ring through a plurality of arc-shaped plates (for example, 8 arc-shaped plates). Thus, it is more convenient to transport the pressure plate 143 and the pre-tightening plate 144 and adjust the number of arc-shaped plates. For example, the number of arc-shaped plates can be adjusted according to the size of the root 121 of the blade 120. As an example, when connecting, the connection positions of the plurality of arc-shaped plates of the pressure plate 143, the pre-tightening plate 144, and the inner cover 141 can be staggered to ensure the connection stability. As an example, the sealing ring 142 can be formed integrally, however, the utility model is not limited thereto.

[0053] Figure 6 FIG. 2 is a perspective view of a protective mechanism according to another embodiment of the present utility model. Figure 6 As shown, an outwardly exposed exhaust hole 141c may be formed between the first portion 141a of the inner cover 141 and the second portion 141b of the inner cover 141. Specifically, the first portion 142a of the sealing ring 142 may be separated from the first portion 141a of the inner cover 141 along the radial direction of the blade 120. In addition, when the pressing plate 143 is provided, the pressing plate 143 may also be separated from the first portion 141a of the inner cover 141 along the radial direction of the blade 120, so that the exhaust hole 141c is exposed outwardly. According to the utility model, by forming the above-mentioned exhaust hole 141c, it is possible to ensure that the inside and outside of the protective mechanism 140 maintain a consistent atmospheric pressure, thereby improving stability. At the same time, if the sealing ring 142 is worn and rainwater enters the protective space 150, if it is not replaced in time, the rainwater can be discharged from the exhaust hole 141c to the external environment when the impeller rotates, thereby avoiding the accumulation of rainwater in the protective space 150.

[0054] As an example, a plurality of exhaust holes 141 c may be formed along the circumference of the inner cover 141 , and the size, number, arrangement form, etc. of the plurality of exhaust holes 141 c are not particularly limited.

[0055] The protective mechanism 140 according to the embodiment of the utility model can be installed, for example, in the following manner. Before the blade 120 and the pitch bearing 130 are installed, the inner cover 141 of the protective mechanism 140 is first adhered to the root 121 of the blade 120 using structural adhesive, and the positioning of the inner cover 141 at the root 121 of the blade 120 is determined according to the required compression amount of the sealing ring 142. Then, the protective mechanism 140 is assembled, that is, the sealing ring 142 is installed to the inner cover 141 by gluing or fastening. Then, the blade 120 and the pitch bearing 130 are installed. After the blade 120 is installed, the sealing ring 142 is pressed against the end face of the outer ring 132 of the pitch bearing 130.

[0056] The wind turbine generator set according to the utility model can achieve beneficial technical effects not limited to the following description.

[0057] According to the wind turbine generator set of the utility model, by setting a protection mechanism, the sealing material on the blade side of the pitch bearing can be sealed in the protection space, thereby preventing ultraviolet rays, rain, sand and dust from contacting the sealing structure and causing seal failure. Therefore, even if the guide cover is removed, the protection of the blade side seal of the pitch bearing can be achieved, avoiding the failure of the pitch bearing seal and further causing the failure of the pitch bearing.

[0058] The protective mechanism of the wind turbine generator set according to the utility model will not hinder operators from operating the fasteners connecting the pitch bearing and the hub.

[0059] The protective mechanism of the wind turbine generator set according to the utility model comprises an inner cover and a sealing ring which are connected to each other, thus facilitating the manufacture and transportation of the protective mechanism.

[0060] According to the utility model, the inner cover and the sealing ring of the protective mechanism of the wind turbine generator set are detachably connected, so it is convenient to manufacture and transport.

[0061] The protection mechanism of the wind turbine generator set according to the utility model comprises a pressure plate and a pre-tightening plate, which can improve the overall rigidity of the protection mechanism, thereby improving the stability and reliability of the protection mechanism.

[0062] According to the utility model, the protection mechanism of the wind turbine generator set comprises an exhaust hole, so that the inside and outside of the protection mechanism maintain a consistent atmospheric pressure, thereby improving stability and preventing rainwater from accumulating in the protection space.

[0063] Although the exemplary embodiments of the present invention have been described in detail with reference to exemplary embodiments thereof, those skilled in the art will understand that various changes in form and details may be made thereto without departing from the spirit and scope of the present invention as defined by the claims.

Claims

1. A wind turbine generator set, characterized in that: The wind turbine generator set (100) comprises: Wheel hub (110); A blade (120) mounted on the hub (110); A pitch bearing (130) is arranged at the junction of the hub (110) and the blade (120), comprising an inner ring (131) and an outer ring (132) that are rotatably connected, the inner ring (131) being connected to the blade (120), and the outer ring (132) being connected to the hub (110); A protective mechanism (140) is arranged to surround the blade (120); one end of the protective mechanism (140) is sealedly connected to the blade (120); the other end of the protective mechanism (140) is pressed against an end surface (132a) of the outer ring (132) close to the blade (120); and the protective mechanism (140) and the blade (120) enclose a protective space (150).

2. The wind turbine generator set according to claim 1, characterized in that: The outer ring (132) and the wheel hub (110) are connected to each other via a first fastener (160), and the position where the other end of the protection mechanism (140) is pressed against the end surface (132a) of the outer ring (132) is located radially inward of the first fastener (160).

3. The wind turbine generator set according to claim 1, characterized in that: The protection mechanism (140) comprises an inner cover (141) surrounding the blade (120) and a sealing ring (142); at least a portion of the inner cover (141) is arranged to fit the root (121) of the blade (120); one end of the sealing ring (142) is connected to the inner cover (141); the other end of the sealing ring (142) is pressed against an end surface (132a) of the outer ring (132); and the sealing ring (142) is spaced a predetermined distance from the root (121) of the blade (120) to form the protection space (150).

4. The wind turbine generator set according to claim 3, characterized in that: The first portion (141a) of the inner cover (141) is fitted with the root (121) of the blade (120); the second portion (141b) of the inner cover (141) extends outward from the first portion (141a) of the inner cover (141) along the radial direction of the blade (120); the first portion (142a) of the sealing ring (142) is connected to the second portion (141b) of the inner cover (141); and the second portion (142b) of the sealing ring (142) extends from the first portion (142a) of the sealing ring (142) toward the outer ring (132) and is pressed against the end surface (132a) of the outer ring (132).

5. The wind turbine generator set according to claim 4, characterized in that: The first part (142a) of the sealing ring (142) is overlapped with the second part (141b) of the inner cover (141), and the first part (142a) of the sealing ring (142) is arranged on the upper side of the second part (141b) of the inner cover (141).

6. The wind turbine generator set according to claim 5, characterized in that: The first portion (142a) of the sealing ring (142) and the second portion (141b) of the inner cover (141) are glued together.

7. The wind turbine generator set according to claim 5, characterized in that: The protection mechanism (140) further comprises a pressure plate (143) and a pre-tightening plate (144) surrounding the blade (120); the pressure plate (143) is arranged on the first portion (142a) of the sealing ring (142); and the pre-tightening plate (144) is arranged below the second portion (141b) of the inner cover (141). The protection mechanism (140) further comprises a second fastener (145), wherein the second fastener (145) sequentially connects the pressure plate (143), the first portion (142a) of the sealing ring (142), the second portion (141b) of the inner cover (141), and the pre-tightening plate (144).

8. The wind turbine generator set according to claim 7, characterized in that: Each of the inner cover (141), the pressure plate (143), and the preload plate (144) includes a plurality of arc-shaped plates connected to one another along the circumferential direction of the blade (120).

9. The wind turbine generator set according to claim 4, characterized in that: The first portion (142a) of the sealing ring (142) is spaced apart from the first portion (141a) of the inner cover (141) in a radial direction of the blade (120), and an outwardly exposed exhaust hole (141c) is formed between the first portion (141a) of the inner cover (141) and the second portion (141b) of the inner cover (141).

10. The wind turbine generator set according to any one of claims 3 to 9, characterized in that: The material of the inner cover (141) is glass fiber reinforced plastic, and the material of the sealing ring (142) is rubber.

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