A rear cover for a wind turbine nacelle and a wind turbine nacelle

Abstract

The utility model provides a kind of rear cover and wind power cabin cover for wind power cabin cover, rear cover includes rear cover body, and rear cover body is equipped with cabin entrance, and the sliding door is equipped at cabin entrance, and the sliding door is used to slide along the length direction of rear cover body, to open or close cabin entrance;The inside of rear cover body is equipped with lower sliding support plate below sliding door, and lower sliding support plate is equipped with lower slide rail, and lower slide rail extends along the length direction of rear cover body, and the lower side of sliding door is equipped with lower sliding connecting portion slidingly connected in lower slide rail;The inside of rear cover body is equipped with upper sliding support plate above sliding door, and upper sliding support plate is equipped with upper slide rail, and upper slide rail extends along the length direction of rear cover body, and the upper side of sliding door is equipped with upper sliding connecting portion slidingly connected in upper slide rail, to improve the technical problem that existing disassembly is complicated, and security risk is poor.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment technology, and in particular to a rear cover for a wind turbine nacelle and a wind turbine nacelle cover. Background Technology

[0002] In wind power systems, the nacelle is a crucial component protecting the internal electrical equipment and transmission systems, and its performance plays a vital role in the stable operation of the wind turbine generator. A wind turbine nacelle consists of an upper cover, lower cover, side covers, front cover, and rear cover. Currently, traditional wind turbine nacelles employ two main types: a fixed structure, where the upper, lower, side, front, and rear covers are all bolted together, necessitating sequential disassembly for inspection and maintenance of the internal equipment. This process is cumbersome, time-consuming, and significantly impacts maintenance efficiency. Another type uses a hinged design, utilizing hydraulic cylinders within the nacelle to lift it to one side around a fixed hinge. However, this structure suffers from drawbacks such as large space requirements, high cost, and susceptibility to wind conditions. Furthermore, opening and closing the nacelle poses significant safety risks for operators working at heights. Utility Model Content

[0003] In view of the shortcomings of the prior art, the present invention provides a rear cover and a wind turbine nacelle cover to improve the existing cumbersome disassembly technology.

[0004] The present invention provides a rear cover for a wind turbine nacelle, including a rear cover body, a nacelle entrance on the rear cover body, and a sliding door at the nacelle entrance, the sliding door being used to slide along the length of the rear cover body to open or close the nacelle entrance.

[0005] The inner side of the rear cover body is provided with a lower sliding support plate below the sliding door. The lower sliding support plate is provided with a lower sliding rail. The lower sliding rail extends along the length of the rear cover body. The lower side of the sliding door is provided with a lower sliding connection part that is slidably connected in the lower sliding rail.

[0006] The inner side of the rear cover body is provided with an upper sliding support plate above the sliding door. The upper sliding support plate is provided with an upper slide rail, which extends along the length of the rear cover body. The upper side of the sliding door is provided with an upper sliding connection part that is slidably connected to the upper slide rail.

[0007] In one embodiment of the present invention, the sliding door includes a first sliding door and a second sliding door, the first sliding door and the second sliding door are offset along the thickness direction of the rear cover body, the lower sliding rail includes a first lower sliding rail and a second lower sliding rail, the lower side of the first sliding door is provided with a first lower sliding connection part slidably connected in the first lower sliding rail, and the lower side of the second sliding door is provided with a second lower sliding connection part slidably connected in the second lower sliding rail.

[0008] In one embodiment of the present invention, the rear cover body includes a first section, a second section and a third section in sequence along its length direction, the cabin entrance covers the first section and the second section, the first sliding door is used to open or close the first section, the second sliding door is used to open or close the second section, the first sliding rail covers the first section, the second section and the third section, and the second sliding rail covers the second section and the third section.

[0009] The cabin entrance has a half-open state and a fully open state. In the half-open state, both the first sliding door and the second sliding door are located in the second section, and the first sliding door is located inside the second sliding door. In the fully open state, both the first sliding door and the second sliding door are located in the third section, and both are located inside the rear cover body of the third section.

[0010] In one embodiment of the present invention, both the first lower slide rail and the second lower slide rail are groove-shaped rails, and both the first lower sliding connection part and the second lower sliding connection part are sliding connection plates, with the sliding connection plates extending along the length direction of the rear cover body.

[0011] And / or, the outer edge of the first sliding door, the outer edge of the second sliding door, and the inner edge of the cabin entrance are all provided with mutually cooperating flanges, and the flanges are provided with a number of spaced bolt holes, and bolts are inserted into the bolt holes.

[0012] In one embodiment of this utility model, the upper slide rail is a groove-shaped track, and the upper sliding support plate includes a top plate. A first baffle and a second baffle are fixedly provided on both sides of the top plate, and both the first baffle and the second baffle extend vertically downward. The first baffle is fixedly connected to the rear cover body. The first baffle, the second baffle, and the top plate together form a groove-shaped track. The upper side of the first sliding door is used as a first upper sliding connection part that is slidably connected in the upper slide rail, and the upper side of the second sliding door is used as a second upper sliding connection part that is slidably connected in the upper slide rail.

[0013] In one embodiment of the present invention, the number of upper sliding support plates is three, and they respectively cover the first partition, the second partition and the third partition;

[0014] And / or, the lower sliding support plate adopts a modular design along the length of the rear cover body.

[0015] In one embodiment of the present invention, the inner sides of both the first sliding door and the second sliding door are provided with reinforcing ribs, which extend along the height direction of the rear cover body.

[0016] In one embodiment of the present invention, a first piece and a second piece are respectively provided on both sides of the rear cover body along its length direction, and both the first piece and the second piece extend toward the inner side of the rear cover body.

[0017] In one embodiment of the present invention, the outer edge of the first sliding door, the outer edge of the second sliding door, and the inner edge of the cabin entrance are all provided with mutually cooperating flanges, and a sealing strip is provided between the flanges;

[0018] And / or, the rear cover is made of glass fiber composite material;

[0019] And / or, the outer surface of the back cover is coated with a gel coat for UV protection, corrosion protection, and aging protection.

[0020] This utility model also provides a wind turbine nacelle cover, including an upper cover, a lower cover, a side cover, a front cover, and the aforementioned rear cover for wind turbine nacelles.

[0021] The beneficial effects of this utility model are as follows: The rear cover for wind turbine nacelles proposed in this utility model has a nacelle entrance on its main body. The sliding door can slide along the length of the rear cover body via an upper sliding support plate and a lower sliding support plate to open or close the nacelle entrance, realizing a push-pull opening and closing function. Compared with the prior art, when inspecting and maintaining the equipment inside the nacelle during high-altitude operations, it is only necessary to drive the sliding door along the length of the rear cover body to open the nacelle entrance, and maintenance personnel can enter the nacelle to perform maintenance operations without disassembling the covers, reducing manpower and time costs, improving maintenance efficiency, and making full use of the inner space of the rear cover body. It occupies little space, is less affected by wind force, and has good safety performance. It is suitable for various types of wind turbine generators, including onshore and offshore ones. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] In the attached diagram:

[0024] Figure 1 A three-dimensional structural schematic diagram of the rear cover for a wind turbine nacelle according to an embodiment of the present invention;

[0025] Figure 2 A top view of the rear cover of a wind turbine nacelle according to an embodiment of the present invention;

[0026] Figure 3 A rear view structural schematic diagram of the rear cover for a wind turbine nacelle according to an embodiment of the present invention;

[0027] Figure 4 Provided for an embodiment of this utility model Figure 1Schematic diagram of the middle and lower sliding support plate;

[0028] Figure 5 Provided for an embodiment of this utility model Figure 1 A schematic diagram of the cooperation structure between the first and second sliding doors;

[0029] Figure 6 A side cross-sectional view of the rear cover of a wind turbine nacelle according to an embodiment of the present invention;

[0030] Figure 7 Provided for an embodiment of this utility model Figure 6 The diagram shown is an enlarged view of the lower part of the rear cover for the wind turbine nacelle.

[0031] Figure 8 Provided for an embodiment of this utility model Figure 6 The diagram shown is an enlarged view of the upper part of the rear cover for the wind turbine nacelle.

[0032] Figure 9 Provided for an embodiment of this utility model Figure 5 Structural diagram of the middle bolt Figure 1 ;

[0033] Figure 10 Provided for an embodiment of this utility model Figure 5 Structural diagram of the middle bolt Figure 2 ;

[0034] Figure 11 A schematic diagram of the structure of a wind turbine nacelle cover provided in an embodiment of this utility model.

[0035] The attached figures are labeled as follows:

[0036] 1. Rear cover; 11. Rear cover body; 111. First section; 112. Second section; 113. Third section; 12. Cabin entrance; 13. Lower sliding support plate; 131. First lower slide rail; 132. Second lower slide rail; 14. Upper sliding support plate; 141. Upper slide rail; 142. Top plate; 143. First baffle; 144. Second baffle; 15. First sliding door; 151. First lower sliding connection; 152. First upper sliding connection; 16. Second sliding door; 161. Second lower sliding connection; 162. Second upper sliding connection; 17. First piece; 18. Second piece; 19. Flange; 21. Bolt; 22. Reinforcing rib; 24. Washer; 25. Nut; 2. Upper cover; 3. Lower cover; 4. Side cover; 5. Front cover. Detailed Implementation

[0037] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0039] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0040] Please see Figure 1-10 This utility model provides a rear cover 1 for a wind turbine nacelle, including a rear cover body 11. The shape of the rear cover body 11 can be flexibly set according to actual usage requirements, including but not limited to rectangles, pentagons, hexagons, etc. The rear cover body 11 is provided with a nacelle entrance 12, and a sliding door is provided at the nacelle entrance 12. The sliding door is used to slide along the length direction of the rear cover body 11 (i.e., along the length direction of the rear cover body 11). Figure 1 Slide in the X direction to open or close the cabin entrance 12.

[0041] The inner side of the rear cover body 11 is provided with a lower sliding support plate 13 below the sliding door. The lower sliding support plate 13 is provided with a lower sliding rail, which extends along the length of the rear cover body 11. The lower side of the sliding door is provided with a lower sliding connection part that is slidably connected to the lower sliding rail. The inner side of the rear cover body 11 is provided with an upper sliding support plate 14 above the sliding door. The upper sliding support plate 14 is provided with an upper sliding rail 141, which extends along the length of the rear cover body 11. The upper side of the sliding door is provided with an upper sliding connection part that is slidably connected to the upper sliding rail 141. In this way, when inspecting and maintaining the equipment inside the nacelle during high-altitude operations, it is only necessary to drive the sliding door to slide along the length of the rear cover body 11 to open the nacelle entrance 12. Maintenance personnel can then enter the nacelle for maintenance operations without disassembling the covers, reducing manpower and time costs, improving maintenance efficiency, and making full use of the inner space of the rear cover body 11. It occupies little space, is less affected by wind force, and has good safety performance. It is suitable for various types of wind turbine generators, including onshore and offshore ones.

[0042] Please see Figure 1-3 The sliding door may include a first sliding door 15 and a second sliding door 16, the first sliding door 15 and the second sliding door 16 being along the thickness direction of the rear cover body 11 (i.e., Figure 1 The sliding door 15 is offset in the Y direction. The sliding rail includes a first sliding rail 131 and a second sliding rail 132. The lower side of the first sliding door 15 is provided with a first lower sliding connection part 151 that is slidably connected to the first sliding rail 131. The lower side of the second sliding door 16 is provided with a second lower sliding connection part 161 that is slidably connected to the second sliding rail 132. This double sliding door structure is divided into two parts: the first sliding door 15 and the second sliding door 16. This reduces the weight of each sliding door, allowing for smooth sliding on the rail. It also makes fuller use of the inner space of the rear cover body 11, increases the cabin entrance 12, and makes it easier for maintenance personnel to enter the cabin cover for maintenance operations through the cabin entrance 12.

[0043] Please see Figure 1 and Figure 3The rear cover body 11 may sequentially include a first partition 111, a second partition 112, and a third partition 113 along its length. The cabin entrance 12 covers the first partition 111 and the second partition 112. A first sliding door 15 is used to open or close the first partition 111, and a second sliding door 16 is used to open or close the second partition 112. A first sliding rail 131 covers the first partition 111, the second partition 112, and the third partition 113 along its length, and a second sliding rail 132 covers the second partition 112 and the third partition 113 along its length. The cabin entrance 12 has a half-open state and a fully open state. In the half-open state, the first sliding door 15 and the second sliding door 16 overlap and are both located in the second partition 112. The sliding door 15 is located inside the second sliding door 16. In the fully open state, the first sliding door 15 and the second sliding door 16 overlap and are both located in the third section 113, and are both located inside the rear cover 1 body in the third section 113. In this way, when the cabin entrance 12 needs to be half open, it is only necessary to drive the first sliding door 15 to slide to the inside of the second sliding door 16 in the second section 112. When it needs to be fully open, it is necessary to drive the first sliding door 15 and the second sliding door 16 to slide to the inside of the rear cover 1 body in the third section 113. The opening state of the cabin entrance 12 can be controlled according to the actual use needs, making fuller use of the inner space of the rear cover 1 body, and making it more convenient for maintenance personnel to enter the cabin cover through the cabin entrance 12 to perform maintenance operations.

[0044] Please see Figure 4-7 Both the first lower slide rail 131 and the second lower slide rail 132 can be (U-shaped) groove tracks. Both the first lower sliding connecting part 151 and the second lower sliding connecting part 161 are sliding connecting plates. The sliding connecting plates extend along the length of the rear cover body 11. In this way, the sliding connecting plate and the groove track are used in combination. When the sliding door is opened or closed, the sliding connecting plate slides in the groove track, which plays a guiding and limiting role, preventing the two from coming off, and increasing the contact area between the two, improving the stability during the sliding process, and facilitating the opening or closing of the sliding door.

[0045] Please see Figure 5The outer edges of the first sliding door 15, the second sliding door 16, and the inner edge of the nacelle entrance 12 can all be provided with mating flanges 19. Each flange 19 has several spaced bolt holes, through which bolts 21 (M10×50 powder-coated zinc bolts 21) pass. Washers 24 can be fitted onto the bolts 21. Thus, after the nacelle entrance 12 is closed, the bolts 21 can pass through the bolt holes on the flanges 19 to fix the first sliding door 15 and the second sliding door 16 to the nacelle entrance 12, improving the overall robustness of the wind turbine nacelle cover. In specific implementation, to achieve a sealed connection at the nacelle entrance 12, this embodiment mainly adopts a butt / lap joint sealing connection method for the flanges 19, and then fixes them with bolts 21. When the nacelle door is closed, high-strength stainless steel bolts 21 penetrate the edge flanges 19 to fix them as a whole. Simultaneously, in the flange... The flange 19 has an embedded rubber sealing strip on the contact surface, forming a dual structure of rigid connection and sealing. The bolt 21 fixed connection has the advantages of reliable structural strength: specifically, M10 stainless steel bolts 21 can be used, with a tensile strength ≥800MPa. A single bolt 21 can withstand an axial tensile force of 1500N, ensuring the wind load resistance when the cover is closed (can withstand strong winds of 30m / s); excellent sealing performance: the (lip-type) rubber sealing strip has a compression of 30%-40%, and the waterproof rating can reach IP65. The amount of dust intrusion is reduced by more than 80% compared with traditional covers; good disassembly: the bolt 21 connection adopts a standardized design, and the disassembly and assembly time of a single rear cover 1 can be controlled within 1 hour, which is 3 times more efficient than the traditional integral cover. In addition, the nut 25 can be a stainless steel welded nut, which can be riveted to the rear cover 1, greatly improving the efficiency of the installation and disassembly of the rear cover 1.

[0046] Rubber sealing strips can be made of EPDM (ethylene propylene diene monomer) sealing strips. EPDM sealing strips have excellent dustproof and waterproof properties. By compressing and deforming to fill gaps, they prevent rainwater, dust, oil, and other contaminants from intruding. They also have a buffering and shock-absorbing function, absorbing vibration energy between mechanical equipment connections and reducing noise transmission. For example, the sealing strips of a fan nacelle can reduce vibration amplitude by 30%-50%. At the same time, they absorb impact energy through elastic deformation, reducing component damage. In addition, they also provide UV protection and chemical corrosion protection.

[0047] Please see Figure 8The upper slide rail 141 can be a grooved track. The upper sliding support plate 14 includes a top plate 142. A first baffle 143 and a second baffle 144 are fixed on both sides of the top plate 142 respectively. The first baffle 143 and the second baffle 144 both extend vertically downward. The first baffle 143 is fixedly connected to the rear cover body 11. The first baffle 143, the second baffle 144, and the top plate 142 together form a grooved track. The upper side of the first sliding door 15 is used as a first upper sliding connection part 152 that is slidably connected in the upper slide rail 141. The upper side of the second sliding door 16 is used as a second upper sliding connection part 162 that is slidably connected in the upper slide rail 141. When the sliding door is opened or closed, the upper side of the first sliding door 15 and the upper side of the second sliding door 16 both slide in the grooved track, which plays a guiding and limiting role, preventing them from falling out, improving the stability during the sliding process, and facilitating the opening or closing of the sliding door.

[0048] Please see Figure 2 The upper sliding support plate 14 can be three, covering the first section 111, the second section 112, and the third section 113 respectively. This ensures that the upper side of the sliding door is within the grooved track when it slides to any section, further improving stability during the sliding process. The lower sliding support plate 13 can be modularly designed along the length of the rear cover body 11, reducing the difficulty of integrated design and facilitating mass production.

[0049] Please see Figure 1 and Figure 3 The inner sides of both the first sliding door 15 and the second sliding door 16 can be provided with reinforcing ribs 22, and the reinforcing ribs 22 are along the height direction of the rear cover body 11 (i.e., Figure 1 Extending in the Z-direction, this enhances the rigidity of the sliding door without increasing its wall thickness, preventing warping and deformation, while also saving materials and reducing weight. The rear cover body 11 can be provided with a first piece 17 and a second piece 18 on both sides along its length. Both the first piece 17 and the second piece 18 extend inwards towards the rear cover body 11. The arrangement of the first piece 17 and the second piece 18 facilitates connection to the side cover 4 of the wind turbine nacelle.

[0050] The aft cover 1 can be made of glass fiber composite material. In specific implementations, the aft cover 1 is made of glass fiber reinforced composite material. Glass fiber has extremely high strength and stiffness. When reinforced with thermoplastic or thermosetting resin, it forms a composite material with high specific strength and specific modulus. In addition, it has advantages such as good fatigue resistance, strong corrosion resistance, and light weight, which can effectively reduce the weight of the cover while ensuring sufficient structural strength. The outer surface of the aft cover 1 can be coated with a gel coat for UV protection, corrosion protection, and aging protection, which can resist the radiation of ultraviolet rays and the erosion of corrosive substances such as seawater and salt spray, extending the service life of the cover.

[0051] Please see Figure 11 This utility model also provides a wind turbine nacelle cover, including an upper cover 2, a lower cover 3, a side cover 4, a front cover 5, and the aforementioned rear cover 1 for the wind turbine nacelle cover; the structure of the rear cover 1 is the same as above, and will not be described again here. The shape of the rear cover 1 can be customized according to the outer contour of the wind turbine nacelle cover to ensure a perfect fit with the wind turbine nacelle cover.

[0052] The following steps can be specifically adopted when designing a wind turbine nacelle cover according to this utility model:

[0053] 1. Research and Analysis: Conduct in-depth research on the performance requirements of wind turbine nacelles under different operating environments (such as offshore, plateau, desert, etc.), including protection performance, ease of opening and closing, structural strength, etc.; collect problems encountered in the use of existing wind turbine nacelles and user feedback, and clarify design goals and technical indicators.

[0054] 2. Structural Design and Modeling: Based on the design objectives, computer-aided design (CAD) software is used to conduct detailed structural design of the wind turbine nacelle. The overall model of the nacelle is constructed using 3D modeling software. The connection methods and mating dimensions between various components are precisely designed. Finite element analysis (FEA) software is used to simulate and analyze the structural strength and stiffness of the nacelle body, optimize the structural design, and ensure its stability and reliability under various working conditions.

[0055] 3. Material Selection and Performance Testing: Based on the operating environment and performance requirements of the hatch cover, suitable materials are selected. For the hatch cover body, the strength, density, and corrosion resistance of the materials are the primary considerations; for sealing materials, their elasticity, weather resistance, and sealing performance are emphasized; for track materials, their wear resistance, corrosion resistance, and strength are key considerations. Laboratory performance tests are conducted on the selected materials to verify whether they meet the design requirements.

[0056] 4. Sealing and Safety Design: Optimize the structure and installation method of the sealing components, verify the sealing performance through simulation tests, and ensure that it can effectively prevent the intrusion of external substances in various harsh environments;

[0057] 5. Trial Production and Field Testing: Manufacture a prototype of the nacelle according to the design scheme and conduct various performance tests in a laboratory environment, including opening and closing performance tests, sealing performance tests, and structural strength tests. Install the qualified prototype on an actual wind turbine generator for field testing, observe its performance under real operating conditions, collect operating data, and further optimize and improve the design based on the test results until it meets the design requirements.

[0058] In summary, the rear cover and wind turbine nacelle cover of this utility model adopt a push-pull design. The sliding door opens and closes via a sliding rail assembly, eliminating the need for large hoisting equipment and significantly reducing the difficulty and cost of installation and disassembly. Compared with traditional bolt-connected nacelle covers, it reduces the process of lowering the rear cover using a tower crane, while also facilitating installation and saving considerable manpower and resources. The rear cover of this utility model can be used in conjunction with other nacelle covers, avoiding redundant development and production for new turbine models; it allows for the sharing of molds among multiple turbine models, enabling a competitive advantage in upgrading to new models; and it achieves the goals of low cost, energy saving, emission reduction, and environmental protection.

[0059] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A rear cover (1) for a wind turbine nacelle cover, characterized in that include: The rear cover body (11) is provided with a cabin entrance (12), and a sliding door is provided at the cabin entrance (12). The sliding door is used to slide along the length direction of the rear cover body (11) to open or close the cabin entrance (12). Wherein: the inner side of the rear cover body (11) is provided with a lower sliding support plate (13) below the sliding door, the lower sliding support plate (13) is provided with a lower sliding rail, the lower sliding rail extends along the length direction of the rear cover body (11), and the lower side of the sliding door is provided with a lower sliding connection part that is slidably connected in the lower sliding rail. The inner side of the rear cover body (11) is provided with an upper sliding support plate (14) above the sliding door. The upper sliding support plate (14) is provided with an upper slide rail (141). The upper slide rail (141) extends along the length direction of the rear cover (1) body. The upper side of the sliding door is provided with an upper sliding connection part that is slidably connected in the upper slide rail (141).

2. The rear cover (1) for a wind turbine nacelle according to claim 1, characterized in that, The sliding door includes a first sliding door (15) and a second sliding door (16). The first sliding door (15) and the second sliding door (16) are offset along the thickness direction of the rear cover body (11). The lower sliding rail includes a first lower sliding rail (131) and a second lower sliding rail (132). The lower side of the first sliding door (15) is provided with a first lower sliding connection part (151) that is slidably connected in the first lower sliding rail (131). The lower side of the second sliding door (16) is provided with a second lower sliding connection part (161) that is slidably connected in the second lower sliding rail (132).

3. The rear cover (1) for a wind turbine nacelle according to claim 2, characterized in that, The rear cover body (11) includes a first partition (111), a second partition (112), and a third partition (113) in sequence along its length direction. The cabin entrance (12) covers the first partition (111) and the second partition (112). The first sliding door (15) is used to open or close the first partition (111). The second sliding door (16) is used to open or close the second partition (112). The first lower slide rail (131) covers the first partition (111), the second partition (112), and the third partition (113). The second lower slide rail (132) covers the second partition (112) and the third partition (113). The cabin entrance (12) has a half-open state and a fully open state. In the half-open state, the first sliding door (15) and the second sliding door (16) are both located in the second partition (112), and the first sliding door (15) is located inside the second sliding door (16). In the fully open state, the first sliding door (15) and the second sliding door (16) are both located in the third partition (113), and both are located inside the rear cover (1) body in the third partition (113).

4. The rear cover (1) for a wind turbine nacelle according to claim 3, characterized in that, The first lower slide rail (131) and the second lower slide rail (132) are both grooved tracks, and the first lower sliding connection part (151) and the second lower sliding connection part (161) are both sliding connection plates, which extend along the length direction of the rear cover body (11). And / or, the outer edge of the first sliding door (15), the outer edge of the second sliding door (16), and the inner edge of the cabin entrance (12) are provided with mutually cooperating flanges (19), and the flanges (19) are provided with a plurality of spaced bolt holes, and bolts (21) are inserted into the bolt holes.

5. The rear cover (1) for a wind turbine nacelle according to claim 3, characterized in that, The upper slide rail (141) is a groove-shaped track. The upper sliding support plate (14) includes a top plate (142). A first baffle (143) and a second baffle (144) are fixedly provided on both sides of the top plate (142). The first baffle (143) and the second baffle (144) both extend vertically downward. The first baffle (143) is fixedly connected to the rear cover body (11). The first baffle (143), the second baffle (144), and the top plate (142) together form a groove-shaped track. The upper side of the first sliding door (15) is used as a first upper sliding connection part (152) that is slidably connected in the upper slide rail (141). The upper side of the second sliding door (16) is used as a second upper sliding connection part (162) that is slidably connected in the upper slide rail (141).

6. The rear cover (1) for a wind turbine nacelle according to claim 5, characterized in that, The number of the upper sliding support plates (14) is three, and they respectively cover the first partition (111), the second partition (112) and the third partition (113); And / or, the lower sliding support plate (13) adopts a modular design along the length direction of the rear cover body (11).

7. The rear cover (1) for a wind turbine nacelle according to claim 3, characterized in that, The inner sides of the first sliding door (15) and the second sliding door (16) are provided with reinforcing ribs (22), which extend along the height direction of the rear cover body (11).

8. The rear cover (1) for a wind turbine nacelle according to claim 3, characterized in that, The rear cover body (11) has a first piece (17) and a second piece (18) on both sides along its length direction, and the first piece (17) and the second piece (18) both extend inward to the rear cover body (11).

9. The rear cover (1) for a wind turbine nacelle according to claim 3, characterized in that, The outer edge of the first sliding door (15), the outer edge of the second sliding door (16), and the inner edge of the cabin entrance (12) are all provided with mutually cooperating flanges (19), and sealing strips are provided between the flanges (19); And / or, the rear cover (1) is made of glass fiber composite material; And / or, the outer surface of the rear cover (1) is coated with a gel coat for UV protection, corrosion protection and aging protection.

10. A wind turbine nacelle cover, characterized in that, It includes an upper cover (2), a lower cover (3), a side cover (4), a front cover (5), and a rear cover (1) for a wind turbine nacelle as described in any of claims 1-9.

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