Manhole cover of wind turbine generator hub and wind turbine generator

Abstract

The utility model discloses a manhole cover of a wind turbine generator hub and a wind turbine generator, the manhole cover comprises a connecting seat, a rain shielding ring and a shade, the connecting seat is connected with a flange of a manhole through a bolt; the rain sheltering ring comprises a lower end connected with the connecting seat and an upper end connected with the shade, the rain sheltering ring is obliquely arranged relative to the central axis of the manhole cover, so that the rain sheltering ring is gradually shrunk from the upper end to the lower end in the radial direction, and vent holes uniformly distributed in the circumferential direction are formed in the position, close to the upper end, of the rain sheltering ring; the shade is of a mushroom-shaped curved surface structure, and drain holes evenly distributed in the circumferential direction are formed in the outermost side of the shade in the radial direction and are closer to the connecting base in the axial direction of the manhole cover than the vent holes. The manhole cover of the wind turbine generator hub can not only meet the sealing requirement for preventing rainwater from entering the hub, but also keep ventilation between the interior and the exterior of the hub so as to balance the pressure difference between the interior and the exterior of the hub, and the working difficulty of field operation and maintenance personnel can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, in particular to a manhole cover for a wind turbine hub and a wind turbine. Background Art

[0002] The hub of a wind turbine is a critical component connecting the blades to the main shaft. The hub houses the electrical system that controls the blades and features a manhole for maintenance personnel. To prevent rainwater from entering the hub and damaging the electrical system, the manhole requires a cover. Currently, a problem with wind turbine manhole covers is that if they seal properly, air cannot enter the hub, resulting in a large pressure differential between the inside and outside of the hub, making it difficult for personnel to open the cover during maintenance. If they seal poorly, water can easily seep into the hub, causing malfunctions or even danger. Therefore, a manhole cover solution is needed that meets sealing requirements while balancing the pressure differential inside and outside the hub, simplifying the work of maintenance personnel and ensuring the safety of the turbine. Utility Model Content

[0003] The purpose of the utility model is to solve the problems existing in the prior art and to propose a manhole cover for a wind turbine hub, wherein a manhole is provided at the front end of the hub, and the manhole cover comprises a connecting seat, a rain shield ring and a cover, and the connecting seat is connected to the flange of the manhole by bolts; the rain shield ring comprises a lower end connected to the connecting seat and an upper end connected to the cover, and the rain shield ring is tilted relative to the central axis of the manhole cover so that the rain shield ring gradually shrinks from the upper end to the lower end in the radial direction, and the rain shield ring is provided with air vents evenly distributed in the circumferential direction at a position near the upper end; the cover is constructed as a mushroom-shaped curved surface structure and is provided with drainage holes evenly distributed in the circumferential direction at the outermost side in the radial direction, and the drainage holes are closer to the connecting seat than the air vents in the axial direction of the manhole cover.

[0004] Furthermore, the manhole cover also includes support rods evenly distributed along the circumferential direction, the lower ends of the support rods are connected to the connecting seat, and the upper ends of the support rods are connected to the shield.

[0005] Furthermore, the outer side surface of the rain shield ring has an annular protrusion structure continuously arranged in the circumferential direction, and the vent hole is located between the cover and the annular protrusion structure.

[0006] Furthermore, the annular protrusion structure is located between the vent hole and the drain hole along the axial direction of the manhole cover.

[0007] Furthermore, the rain shield ring has two groups of ventilation holes arranged at intervals along the cross-sectional profile.

[0008] Furthermore, the opening edge of the mask is spaced a certain distance from the connecting seat and the rain shield ring, so that the distance between the opening edge and the central axis of the manhole cover is greater than the distance between the vent and the central axis of the manhole cover.

[0009] The utility model also provides a wind turbine generator set, which comprises the manhole cover of the wind turbine generator set hub.

[0010] The manhole cover of the wind turbine hub of the utility model can not only meet the sealing requirement of preventing rainwater from entering the hub, but also maintain ventilation between the inside and outside of the hub to balance the pressure difference between the inside and outside of the hub, which can reduce the work difficulty of on-site operation and maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the device and principle of the present invention. In the drawings,

[0012] Figure 1 This is a structural schematic diagram of a manhole cover of a wind turbine hub according to an embodiment of the present utility model;

[0013] Figure 2 This is a three-dimensional schematic diagram of a manhole cover of a wind turbine hub according to an embodiment of the utility model.

[0014] Reference numerals:

[0015] 1. Connecting seat;

[0016] 2. Rain shield ring; 21. Ventilation hole; 22. Ring-shaped protrusion structure;

[0017] 3. Mask; 31. Drain hole; 32. Opening edge;

[0018] 4. Support rod;

[0019] 5. Wheel hub. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described are only preferred embodiments of the present invention, and are not intended to be exhaustive. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0021] It should be understood that, unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the field of the present invention. The terms used herein are intended solely to describe specific embodiments and are not intended to limit the present invention. Terms such as "part" and "component" may refer to either a single part or a combination of multiple parts. The singular forms "a," "an," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. Ordinal numbers such as "first" and "second" are merely identifiers and do not have any other meaning, such as a specific order. Furthermore, for example, the term "first component" itself does not imply the presence of a "second component," and the term "second component" itself does not imply the presence of a "first component." When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or combinations thereof. The terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", "center", "vertical", "horizontal" and similar expressions are for illustrative purposes only and are not restrictive. The terms "connect", "install", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. The features described in this document in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0022] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings. These drawings illustrate representative embodiments of the present invention and are not intended to limit the present invention.

[0023] The utility model provides a manhole cover for a hub of a wind turbine. A manhole is provided at the front end of the hub 5. The manhole can be located on the opposite side of the hub 5 where the main shaft is connected. Figure 1 and Figure 2As shown, the manhole cover includes a connecting seat 1, a rain shield ring 2 and a mask 3. The connecting seat 1 is connected to the flange of the manhole by bolts; the rain shield ring 2 includes a lower end connected to the connecting seat 1 and an upper end connected to the mask 3, and the rain shield ring 2 is tilted relative to the central axis of the manhole cover so that the rain shield ring 2 gradually shrinks from the upper end to the lower end in the radial direction, and the rain shield ring 2 is provided with air vents 21 uniformly distributed in the circumferential direction and passing through the wall plate of the rain shield ring at a position near the upper end; the mask 3 is constructed as a mushroom-shaped curved surface structure and is provided with drainage holes 31 uniformly distributed in the circumferential direction at the outermost side in the radial direction, and the drainage holes 31 are closer to the connecting seat 1 than the air vents 21 along the axial direction of the manhole cover. Preferably, as Figure 2 The three-dimensional cross-sectional view of the manhole cover shown in FIG. 4 shows a support rod 4 for increasing the structural strength of the manhole cover. The lower end of the support rod 4 is connected to the upper end surface of the connecting seat 1, and the upper end is connected to the inner side surface of the shield 3.

[0024] By providing drainage holes on the shield and ventilation holes on the rain shield ring, air circulation is maintained inside and outside the manhole cover. Under the action of the inclined surface of the rain shield ring, rainwater entering the shield flows down along the outer side of the rain shield ring. Moreover, because the axial position of the drainage holes is closer to the connecting seat or the hub side than the ventilation holes, rainwater entering the shield through the drainage holes will not flow into the ventilation holes, but will flow along the inclined surface of the rain shield ring to the connecting seat and the hub surface. When the hub rotates, the accumulated water in the shield will be thrown to the drainage hole position under the action of centrifugal force and thrown out from the drainage hole. Therefore, the manhole cover of the wind turbine hub of the utility model can not only meet the sealing requirements of preventing rainwater from entering the hub, but also maintain ventilation between the inside and outside of the hub, thereby balancing the pressure difference between the inside and outside of the hub.

[0025] According to an embodiment of the present invention, the outer side of the rain shield ring 2 has an annular protrusion structure 22 continuously arranged in the circumferential direction, and the vent 21 is located between the shield 3 and the annular protrusion structure 22. The addition of the annular protrusion structure 22 to the inclined surface of the rain shield ring 2 can prevent rainwater from flowing back into the vent 21. Preferably, the annular protrusion structure 22 is located between the vent 21 and the drain hole 31 along the axial direction of the manhole cover. The axial separation of the vent 21 and the drain hole 31 by the annular protrusion structure 22 helps prevent rainwater that flows into the manhole cover through the drain hole 31 from entering the vent 21.

[0026] According to an embodiment of the present invention, the rain shield ring 2 has two groups of vent holes 21 spaced apart along the cross-sectional profile. Reducing the size of the vent holes 21 helps prevent rainwater from entering, and increasing the number of vent holes 21 helps balance the pressure difference between the inside and outside of the hub. Furthermore, the opening edge 32 of the shield 3 is spaced a certain distance from the connecting seat 1 and the rain shield ring 2, so that the distance between the opening edge 32 and the central axis of the manhole cover is greater than the distance between the vent holes 21 and the central axis of the manhole cover. This arrangement ensures that the accumulated water in the shield 3 that flows to the bottom of the manhole cover is discharged from the drain hole 31 or the opening edge 32, and does not enter the vent holes 21.

[0027] The present invention has been described through the above embodiments, but it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, those skilled in the art will appreciate that the present invention is not limited to the above embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manhole cover for a wind turbine hub, wherein a manhole is provided at the front end of the hub (5), characterized in that: The manhole cover comprises a connecting seat (1), a rain shield ring (2) and a shield (3); the connecting seat (1) is connected to the flange of the manhole by bolts; the rain shield ring (2) comprises a lower end connected to the connecting seat (1) and an upper end connected to the shield (3); the rain shield ring (2) is tilted relative to the central axis of the manhole cover so that the rain shield ring (2) gradually shrinks from the upper end to the lower end in the radial direction; the rain shield ring (2) is provided with vent holes (21) uniformly distributed in the circumferential direction at a position close to the upper end; the shield (3) is constructed as a mushroom-shaped curved surface structure and is provided with drainage holes (31) uniformly distributed in the circumferential direction at the outermost side in the radial direction; the drainage holes (31) are closer to the connecting seat (1) than the ventilation holes (21) in the axial direction of the manhole cover.

2. The manhole cover of the wind turbine hub according to claim 1, characterized in that: The manhole cover further comprises support rods (4) uniformly distributed along the circumferential direction, wherein the lower ends of the support rods (4) are connected to the connecting seat (1), and the upper ends of the support rods (4) are connected to the shield (3).

3. The manhole cover of the wind turbine hub according to claim 1, characterized in that: The outer side surface of the rain shield ring (2) has an annular protrusion structure (22) continuously arranged in a circumferential direction, and the vent hole (21) is located between the mask (3) and the annular protrusion structure (22).

4. The manhole cover of the wind turbine hub according to claim 3, characterized in that: The annular protrusion structure (22) is located between the vent hole (21) and the drain hole (31) along the axial direction of the manhole cover.

5. The manhole cover of the wind turbine hub according to claim 1, characterized in that: The rain shield ring (2) has two groups of vent holes (21) arranged at intervals along the cross-sectional profile.

6. The manhole cover of the wind turbine hub according to any one of claims 1 to 5, characterized in that: The opening edge (32) of the shield (3) is spaced a certain distance from the connecting seat (1) and the rain shield ring (2), so that the distance between the opening edge (32) and the central axis of the manhole cover is greater than the distance between the vent hole (21) and the central axis of the manhole cover.

7. A wind turbine generator system, characterized in that: The wind turbine generator set comprises the manhole cover of the wind turbine generator set hub according to any one of claims 1 to 6.

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