Rain protection device and fan

Abstract

The present invention provides a rainproof device and a fan, the rainproof device comprising: a blade rainproof ring, the first end of which is sleeved on the outer periphery of the blade root; a retaining frame connected to the blade rainproof ring, the retaining frame is provided with a guide rail structure, the guide rail structure extends along the circumference of the blade root; at least two arc-shaped rainproof pieces, the arc-shaped rainproof pieces can together form a full ring structure, at least one of the arc-shaped rainproof pieces can slidably cooperate with the guide rail structure and can be separated from the adjacent arc-shaped rainproof pieces. The rainproof device and the fan provided by the present invention can facilitate the internal maintenance of the fan on the basis of forming a good rainproof effect.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a rainproof device and a wind turbine. Background Art

[0002] Wind turbine equipment is a new energy equipment that generates electricity through wind power. The wind turbine includes a hub, a pitch bearing, blades and other devices, among which the blades are installed on the hub through the pitch bearing.

[0003] In order to prevent rainwater from entering the variable pitch bearing and the hub and affecting the variable pitch bearing and the hub components, there is a wind turbine rain cover in the prior art. The wind turbine rain cover is configured as an annular structure with a large diameter end and a small diameter end. The small diameter end is sleeved on the outer periphery of the root of the blade, and the large diameter end is matched with the guide cover of the hub. A fan-shaped notch is provided on the upper side of the rain cover to prevent the transport height from exceeding the height limit. The fan-shaped annular connecting petal body is detachably installed at the fan-shaped notch to finally form a full circle of rain cover.

[0004] However, the rain cover in the prior art is not convenient for internal maintenance of the fan. Summary of the invention

[0005] The present invention provides a rainproof device and a fan, which can facilitate the internal maintenance of the fan on the basis of forming a good rainproof effect.

[0006] A first aspect of the present invention provides a rain protection device, comprising:

[0007] A blade rainproof ring, the first end of which is sleeved on the outer periphery of the blade root;

[0008] A retainer connected to the blade rainproof ring, the retainer is provided with a guide rail structure, and the guide rail structure extends along the circumference of the blade root;

[0009] There are at least two arc-shaped rainproof pieces, which can together form a full ring structure. At least one of the arc-shaped rainproof pieces can slidably cooperate with the guide rail structure and can be separated from the adjacent arc-shaped rainproof pieces.

[0010] According to the rain protection device provided by the present invention, the arc-shaped rain protection piece includes: an upper arc-shaped rain protection piece and a lower arc-shaped rain protection piece; there are multiple upper arc-shaped rain protection pieces and multiple lower arc-shaped rain protection pieces, and the upper arc-shaped rain protection pieces and the lower arc-shaped rain protection pieces are respectively arranged at intervals, and the two ends of the upper arc-shaped rain protection piece are respectively placed on the two adjacent lower arc-shaped rain protection pieces; at least the upper arc-shaped rain protection piece can slide along the guide rail structure.

[0011] According to the rain protection device provided by the present invention, the retaining frame includes: a first guide plate and a second guide plate, the first guide plate and the second guide plate are arranged at an interval to form the guide rail structure therebetween; a first flange structure is arranged at the end of each of the arc-shaped rain protection pieces, and the first flange structures of any two adjacent arc-shaped rain protection pieces are overlapped and arranged in the guide rail structure.

[0012] According to the rain protection device provided by the present invention, the cross-sectional shapes of the first guide plate and the second guide plate are both arc-shaped, and the cross-sectional shape of the first flange structure is also arc-shaped.

[0013] According to the rain protection device provided by the present invention, the retaining frame includes a first supporting portion, one end of the first supporting portion is connected to the back of the first guide plate, and the other end is connected to the blade rain protection ring.

[0014] According to the rain protection device provided by the present invention, the retaining frame also includes a second supporting portion, one end of the second supporting portion is connected to the back of the second guide plate, and the other end is connected to the blade rain protection ring.

[0015] According to the rainproof device provided by the present invention, any two adjacent arc-shaped rainproof members are fixed to each other via a positioning member, and the positioning member is detachably arranged.

[0016] According to the rain protection device provided by the present invention, the second end of the blade rain protection ring is arranged as a second flange structure, the retaining frame is connected to the second flange structure, and a closed cavity is formed between the retaining frame and the blade rain protection ring.

[0017] According to the rainproof device provided by the present invention, a water leakage hole is arranged at the bottom of the closed cavity.

[0018] According to the rain protection device provided by the present invention, an inclined portion is provided between the first end and the second end of the rain protection ring of the blade, and the inclined portion gradually inclines in a direction away from the blade along the direction from the top to the root of the blade.

[0019] The rain protection device provided according to the present invention further includes: a bearing rain protection ring connected to the outer ring of the bearing, and the bearing rain protection ring at least partially extends into the arc-shaped rain protection member.

[0020] According to the rain protection device provided by the present invention, a third flange structure turned toward the arc-shaped rain protection piece is provided at the position where the bearing rain protection ring extends into the arc-shaped rain protection piece.

[0021] A second aspect of the present invention provides a wind turbine provided with blades and a rain protection device connected to the blades, wherein the rain protection device is a rain protection device as described in any one of the above items.

[0022] Beneficial effects:

[0023] 1. The rain protection device provided by the present invention comprises a blade rain protection ring, a retaining frame and an arc-shaped rain protection piece, wherein the first end of the blade rain protection ring is sleeved on the outer periphery of the blade root; the retaining frame is connected to the blade rain protection ring, and the retaining frame is provided with a guide rail structure, and the guide rail structure extends along the circumference of the blade root; there are at least two arc-shaped rain protection pieces, and the arc-shaped rain protection pieces can together form a full ring structure, and at least one of the arc-shaped rain protection pieces can be slidably matched with the guide rail structure and can be separated from the adjacent arc-shaped rain protection pieces.

[0024] With this arrangement, the blade rain shield can provide rain protection for the blade root, and each arc-shaped rain shield forms a rain shield together with the blade rain shield when forming a full ring structure, which can effectively prevent rainwater from entering the bearing and the hub. When maintenance is required, the arc-shaped rain shield can be operated to slide along the guide rail to separate the arc-shaped rain shield from its adjacent arc-shaped rain shield, thereby forming an inspection port, which is convenient for operators to inspect the interior.

[0025] 2. In a further technical solution provided by the present invention, the arc-shaped rainproof piece includes: an upper arc-shaped rainproof piece and a lower arc-shaped rainproof piece, and there are multiple upper arc-shaped rainproof pieces and multiple lower arc-shaped rainproof pieces. The upper arc-shaped rainproof pieces and the lower arc-shaped rainproof pieces are respectively arranged at intervals, and the two ends of the upper arc-shaped rainproof piece are respectively placed on the two adjacent lower arc-shaped rainproof pieces; at least the upper arc-shaped rainproof piece can slide along the guide rail structure.

[0026] With such arrangement, when maintenance is required from different positions, one or more upper arc-shaped rainproof parts at the corresponding positions can be operated to slide, so that maintenance openings are formed corresponding to the positions requiring maintenance, further improving the operability of maintenance.

[0027] 3. In a further technical solution provided by the present invention, the retaining frame includes: a first guide plate and a second guide plate, the first guide plate and the second guide plate are arranged at an interval to form the guide rail structure therebetween; a first flange structure is arranged at the end of each of the arc-shaped rainproof pieces, and the first flange structures of any two adjacent arc-shaped rainproof pieces are partially overlapped and arranged in the guide rail structure.

[0028] The first guide plate and the second guide are both annular and are spaced apart from each other. The first flange structure of the arc-shaped rain shield is connected in the gap between the first guide plate and the second guide plate, and the first flange structure of the arc-shaped rain shield can slide along the first guide plate or the second guide plate. In this way, the sliding installation of the arc-shaped rain shield is realized, and the structure is simple and reliable.

[0029] 4. In a further technical solution provided by the present invention, the second end of the blade rain protection ring is set as a second flange structure, the retaining frame is connected to the second flange structure, and a closed cavity is formed between the retaining frame and the blade rain protection ring, and a water leakage hole is set at the bottom of the closed cavity.

[0030] With such arrangement, when the fan blades face upward, rainwater will flow into the above-mentioned enclosed cavity along the arc-shaped rainproof member. Since a drainage hole is provided at the bottom of the enclosed cavity, rainwater can be discharged through the drainage hole, thereby preventing rainwater from entering the internal space of the arc-shaped rainproof member.

[0031] 5. The present invention further provides a fan, provided with blades and a rainproof device connected to the blades, wherein the rainproof device is the rainproof device as described in any of the above items. With such a configuration, the fan provided by the present invention can conveniently perform maintenance on bearings, hubs and other components while preventing rainwater from entering bearings, hubs and other components. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought about by the above-mentioned rainproof device, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present invention or 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 is a partial schematic diagram of a fan in an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the connection structure of the blade rainproof ring, the retaining frame and the arc-shaped rainproof member in the embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a retainer in an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the connection structure between the blade rainproof ring and the retaining frame in an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of the connection structure of the arc-shaped rainproof member in an embodiment of the present invention;

[0038] Figure 6 2 is a schematic diagram of the connection structure of the blade rainproof ring, the retaining frame and the arc-shaped rainproof member in another angle in the embodiment of the present invention;

[0039] 1: Blade rainproof ring; 11: Sealed cavity; 12: Second flange structure;

[0040] 21: first supporting part; 22: second supporting part; 23: upper arc-shaped rainproof part;

[0041] 24: lower arc-shaped rainproof member; 25: first guide plate; 26: second guide plate;

[0042] 2: Arc-shaped rainproof part; 3: Bearing rainproof ring; 4: Bearing;

[0043] 5: Hub; 6: Connecting bolts; 7: Blade root;

[0044] 8: Guide rail structure; 9: Cage. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0046] Combine the following Figure 1-Figure 6 The rain protection device and the wind turbine in the embodiment of the present invention are described. The rain protection device provided in the embodiment includes a blade rain protection ring 1, a retaining frame 9 and an arc-shaped rain protection member 2.

[0047] In this embodiment, the blade root 7 is mounted on the hub 5 via the bearing 4 , wherein the outer ring of the bearing 4 is fixedly connected to the hub 5 via the connecting bolts 6 , and the inner ring of the bearing 4 is connected to the blade root 7 .

[0048] The blade rain protection ring 1 can be specifically a sheet metal part, and the blade rain protection ring 1 is specifically a ring structure. The first end of the blade rain protection ring 1 is sleeved on the outer periphery of the fan blade root 7. In some embodiments, the blade rain protection ring 1 can be connected to the blade root 7 by bolts, rivets, welding, etc.

[0049] The retaining frame 9 is connected to the blade rain protection ring 1 . Specifically, the retaining frame 9 is configured as an annular structure and is connected to the inner side surface of the blade rain protection ring 1 . The retaining frame 9 is provided with a guide rail structure 8 , which extends circumferentially along the blade root 7 .

[0050] There are at least two arc-shaped rainproof members 2, which can be connected end to end to form a full ring structure. At least one arc-shaped rainproof member 2 can be slidably matched with the guide rail structure 8 and can be separated from the adjacent arc-shaped rainproof member 2 to form an inspection port.

[0051] With such arrangement, when the arc-shaped rainproof member 2 forms a full ring structure, the arc-shaped rainproof member 2 and the blade rainproof ring 1 together form a rainproof cover, which covers the outside of the bearing 4 to prevent rainwater from entering the bearing 4 and the inside of the hub 5, thereby achieving a better rainproof effect. When maintenance is required, the arc-shaped rainproof member 2 can be operated to slide along the guide rail to separate the arc-shaped rainproof member 2 from the adjacent arc-shaped rainproof member 2, thereby forming an inspection port, which is convenient for operators to inspect the inside.

[0052] In a further embodiment, the arc-shaped rainproof member 2 comprises: an upper arc-shaped rainproof member 23 and a lower arc-shaped rainproof member 24, and there are multiple upper arc-shaped rainproof members 23 and lower arc-shaped rainproof members 24. The upper arc-shaped rainproof member 23 and the lower arc-shaped rainproof member 24 are arranged at intervals, and the two ends of the upper arc-shaped rainproof member 23 are respectively placed on the two adjacent lower arc-shaped rainproof members 24; at least the upper arc-shaped rainproof member 23 can slide along the guide rail structure 8.

[0053] In some embodiments, the upper arc-shaped rainproof pieces 23 and the lower arc-shaped rainproof pieces 24 are both provided in three numbers, the lower arc-shaped rainproof pieces 24 are provided at intervals one by one, and the upper arc-shaped rainproof pieces 23 are also provided at intervals one by one, and both ends of each upper arc-shaped rainproof piece 23 are overlapped on the ends of the two lower arc-shaped rainproof pieces 24, and, in some embodiments, each upper arc-shaped rainproof piece 23 can be slidably matched with the guide rail structure 8, and each lower arc-shaped rainproof piece 24 can be fixedly provided, or, in other embodiments, the lower arc-shaped rainproof piece 24 can be slidably matched with the guide rail structure 8.

[0054] When maintenance is required, the upper arc-shaped rainproof member 23 at the corresponding position can be slid along the guide rail structure 8 to form an inspection opening between the upper arc-shaped rainproof member 23 and the lower arc-shaped rainproof member 24 for internal maintenance. In this way, multiple inspection openings can be formed, corresponding to different positions of the fan, so that different positions of the fan can be easily inspected.

[0055] In a further embodiment, the retainer 9 includes a first guide plate 25 and a second guide plate 26, which are arranged at intervals to form the guide rail structure 8 therebetween. The ends of each arc-shaped rainproof member 2 are provided with a first flange structure, and the first flange structures of any two adjacent arc-shaped rainproof members 2 are partially overlapped and arranged in the guide rail structure 8.

[0056] The first guide plate 25 and the second guide plate 26 are both arranged in annular shapes and are arranged correspondingly, and the gap between them constitutes the guide rail structure 8. Specifically, the distance between the first guide plate 25 and the second guide plate 26 is slightly greater than twice the thickness of the first flange structure.

[0057] In some embodiments, when the arc-shaped rain shield 2 is surrounded into a full ring, the first flange structure of each arc-shaped rain shield 2 forms a flange toward the outside of the ring, and the first flange structure extends between the first guide plate 25 and the second guide plate 26 to achieve the coordination between the arc-shaped rain shield 2 and the guide rail structure 8.

[0058] In a further embodiment, the cross-sectional shape of the first guide plate 25 and the second guide plate 26 are both arc-shaped, and the cross-sectional shape of the first flange structure is also arc-shaped.

[0059] The cross-sectional shapes of the first guide plate 25 and the second guide plate 26 are both arc-shaped, and the cross-sectional shapes of each arc-shaped rainproof member 2 are also arc-shaped, and the centers of the arcs are arranged in the same direction.

[0060] With such arrangement, the contact surface between each arc-shaped rainproof member 2 and the first guide plate 25 and the second guide plate 26 is larger, and the contact surface is a relatively smooth arc-shaped surface. On the one hand, the arc-shaped rainproof member 2 can be reliably connected to the guide rail structure 8. On the other hand, when the arc-shaped rainproof member 2 slides along the guide rail structure 8, it has less resistance, which facilitates sliding.

[0061] In a further embodiment, the retaining frame 9 also includes a first support portion 21 and a second support portion 22, one end of the first support portion 21 and the second support portion 22 are respectively connected to the back of the first guide plate 25 and the second guide plate 26, and the other end is respectively connected to the blade rain protection ring 1.

[0062] The back of the first guide plate 25 and the second guide plate 26 refers to the side opposite to the corresponding surface of the first guide plate 25 and the second guide plate 26. The first support portion 21 and the second support portion 22 can be respectively provided in the form of ribs, and specifically, the first support portion 21 and the second support portion 22 can be welded to the back of the first guide plate 25 and the second guide plate 26.

[0063] In order to achieve reliable connection between the first support part 21 and the second support part 22 and the blade rain shield ring 1, the first support part 21 and the second support part 22 are respectively provided with a fitting surface that fits with the blade rain shield ring 1. After the first support part 21 and the second support part 22 are fitted with the blade rain shield ring 1, the connection can be achieved by connecting parts such as screws and rivets or by welding.

[0064] In addition, in order to prevent the arc-shaped rainproof member 2 from sliding relative to each other when the blade rotates, resulting in the opening of the inspection port, in an advanced embodiment, any two adjacent arc-shaped rainproof members 2 are fixed by a positioning member, and the positioning member is detachably arranged.

[0065] In some embodiments, the positioning member may be a screw, and two adjacent arc-shaped rainproof members 2 are provided with corresponding screw holes at the overlapping positions, and the screws are inserted into the two corresponding screw holes to realize the mutual positioning of the two adjacent arc-shaped rainproof members 2. When it is necessary to slide the arc-shaped rainproof member 2 to open the inspection port, the screws can be removed, thereby releasing the mutual positioning between the two arc-shaped rainproof members 2.

[0066] Of course, in other embodiments, the positioning member may also be configured as other types such as a pin. In addition, in order to achieve reliable positioning of two adjacent arc-shaped rainproof members 2, the two adjacent arc-shaped rainproof members 2 may be positioned relative to each other by a plurality of positioning members.

[0067] In a further embodiment, the second end of the blade rain protection ring 1 is set as a second flange structure 12, the retaining frame 9 is connected to the second flange structure 12, and a closed cavity 11 is formed between the retaining frame 9 and the blade rain protection ring 1, and a water leakage hole is set at the bottom of the closed cavity 11.

[0068] The second flange structure 12 can be specifically set as a semi-annular structure, and the first support portion 21 and the second support portion 22 of the retainer 9 close the semi-annular structure to form a closed cavity 11. When the blades face upward, a small amount of rainwater will enter the closed cavity 11 along the arc-shaped rainproof member 2. In order to discharge this part of rainwater and prevent rainwater from entering the fan, a leaking hole is provided at the bottom of the closed cavity 11. The rainwater entering the closed cavity 11 is discharged to the outside through the leaking hole to avoid entering the fan.

[0069] In a further embodiment, in order to prevent rainwater in the closed cavity 11 from flowing out into the interior of the wind turbine through the gap between the upper arc-shaped rain shield 23 and the lower arc-shaped rain shield 24 when the blades rotate, rainproof flanges are provided at the ends of the upper arc-shaped rain shield 23 and the lower arc-shaped rain shield 24 close to the closed cavity 11. The rainproof flanges are blocked in front of the gap between the upper arc-shaped rain shield 23 and the lower arc-shaped rain shield 24, thereby preventing rainwater from entering the gap between the upper arc-shaped rain shield 23 and the lower arc-shaped rain shield 24 when the blades rotate.

[0070] In a further embodiment, an inclined portion is provided between the first end and the second end of the blade rain protection ring 1, and the inclined portion gradually inclines in a direction away from the blade along the direction from the top end to the root end of the blade.

[0071] The first end of the blade rainproof ring 1 can be set as a cylindrical structure, and is sleeved on the blade root 7 to form a reliable connection relationship with the blade root 7. The inclined portion of the blade rainproof ring 1 constitutes a conical structure, one end of the conical structure is connected to the first end of the blade rainproof ring 1, and the other end is connected to the second flange structure 12. In this way, the conical structure can divert rainwater to a position away from the blade root 7, forming a better rainproof effect.

[0072] In a further embodiment, the rain protection device also includes a bearing rain protection ring 3, which is connected to the outer ring of the bearing 4, and the bearing rain protection ring 3 at least partially extends into the arc-shaped rain protection piece 2. The position where the bearing rain protection ring 3 extends into the arc-shaped rain protection piece 2 is provided with a third flange structure that is flipped toward the arc-shaped rain protection piece 2.

[0073] The bearing rain shield ring 3 is an annular structure and is sleeved on the outer ring of the bearing 4. The bearing rain shield ring 3 at least partially extends into the annular space surrounded by the arc-shaped rain shield member 2. Since the bearing rain shield ring 3 is provided with a third flange structure, when rainwater enters from the gap between the arc-shaped rain shield member 2 and the bearing rain shield ring 3, it will be blocked by the third flange structure, thereby preventing rainwater from flowing into the inside of the fan.

[0074] The embodiment of the present invention further provides a fan, which is provided with blades and a rainproof device connected to the blades, and the rainproof device is the rainproof device described in any of the above embodiments. With such a configuration, the fan provided by the present invention has a good rainproof effect and can conveniently realize the internal maintenance of the fan. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought by the above-mentioned rainproof device, and will not be repeated here.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rain protection device, characterized in that: include: A blade rainproof ring (1), the first end of which is sleeved on the outer periphery of the blade root (7); A retainer (9) connected to the blade rainproof ring (1), the retainer (9) being provided with a guide rail structure (8), the guide rail structure (8) extending along the circumference of the blade root (7); There are at least two arc-shaped rainproof pieces (2), and the arc-shaped rainproof pieces (2) can together form a full ring structure. At least one of the arc-shaped rainproof pieces (2) can slidably cooperate with the guide rail structure (8) and can be separated from the adjacent arc-shaped rainproof pieces (2).

2. The rain protection device according to claim 1, characterized in that: The arc-shaped rainproof member (2) comprises: an upper arc-shaped rainproof member (23) and a lower arc-shaped rainproof member (24); the upper arc-shaped rainproof member (23) and the lower arc-shaped rainproof member (24) are both multiple, the upper arc-shaped rainproof member (23) and the lower arc-shaped rainproof member (24) are respectively arranged at intervals, and the two ends of the upper arc-shaped rainproof member (23) are respectively placed on the two adjacent lower arc-shaped rainproof members (24); at least the upper arc-shaped rainproof member (23) can slide along the guide rail structure (8).

3. The rain protection device according to claim 2, characterized in that: The retaining frame (9) comprises: a first guide plate (25) and a second guide plate (26), wherein the first guide plate (25) and the second guide plate (26) are arranged at an interval to form the guide rail structure (8) therebetween; a first flange structure is arranged at the end of each of the arc-shaped rainproof members (2), and the first flange structures of any two adjacent arc-shaped rainproof members (2) are overlapped and arranged in the guide rail structure (8).

4. The rain protection device according to claim 3, characterized in that: The cross-sectional shapes of the first guide plate (25) and the second guide plate (26) are both arc-shaped, and the cross-sectional shape of the first flange structure is also arc-shaped.

5. The rain protection device according to claim 4, characterized in that: The retaining frame (9) comprises a first supporting portion (21), one end of the first supporting portion (21) is connected to the back of the first guide plate (25), and the other end is connected to the blade rainproof ring (1).

6. The rain protection device according to claim 5, characterized in that: The retaining frame (9) further comprises a second supporting portion (22), one end of the second supporting portion (22) being connected to the back of the second guide plate (26), and the other end being connected to the blade rainproof ring (1).

7. The rain protection device according to claim 2, characterized in that: Any two adjacent arc-shaped rainproof parts (2) are fixed to each other via a positioning part, and the positioning part is detachably arranged.

8. The rain protection device according to any one of claims 2 to 7, characterized in that: The second end of the blade rainproof ring (1) is arranged as a second flange structure (12), the retaining frame (9) is connected to the second flange structure (12), and a closed cavity (11) is formed between the retaining frame (9) and the blade rainproof ring (1).

9. The rain protection device according to claim 8, characterized in that: A water leakage hole is arranged at the bottom of the sealed cavity (11).

10. The rain protection device according to claim 9, characterized in that: An inclined portion is provided between the first end and the second end of the blade rainproof ring (1), and along the direction from the top end to the root of the blade, the inclined portion gradually inclines in a direction away from the blade.

11. The rain protection device according to any one of claims 1 to 7, characterized in that: Also includes: The bearing rainproof ring (3) is connected to the outer ring of the bearing, and the bearing rainproof ring (3) at least partially extends into the arc-shaped rainproof member (2).

12. The rain protection device according to claim 11, characterized in that: The position where the bearing rainproof ring (3) extends into the arc-shaped rainproof member (2) is provided with a third flange structure that is turned toward the arc-shaped rainproof member (2).

13. A fan, characterized in that: A blade and a rain protection device connected to the blade are provided, and the rain protection device is the rain protection device as described in any one of claims 1-12.

Images