Fan and its rear frame assembly

Abstract

This utility model relates to the field of wind turbines and discloses a wind turbine and its rear frame assembly. The rear frame assembly is set inside the nacelle of the wind turbine and includes a rear frame, a converter, and a transformer. The transformer is detachably mounted on the rear frame and located below the converter. The rear frame has an inlet / outlet opening for the transformer to enter and exit along the height direction of the rear frame. The converter is movably mounted on the rear frame along the length direction of the rear frame. The converter has a blocking position and a clearance position on its movement path. When the converter is in the blocking position, it at least partially coincides with the inlet / outlet opening along the length and width directions. When the converter is in the clearance position, it is offset from the inlet / outlet opening along the length direction to allow the transformer to enter and exit through the inlet / outlet opening. When disassembling or installing the transformer, it is not necessary to remove and lift the converter first, and large lifting equipment is not required, making the operation convenient and cost-effective for changes or maintenance.

Description

Technical Field

[0001] This utility model relates to the field of wind turbines, and more particularly to a rear frame assembly for a wind turbine. Background Technology

[0002] A wind turbine generator set, or wind turbine, has a rear frame that serves to support the turbine, transfer loads, and provide maintenance access. Components such as converters, transformers, electrical control cabinets, and cooling systems can be installed on the rear frame. Currently, converters and transformers installed on the rear frame are generally fixed with fasteners and are detachable, allowing them to be removed in case of malfunction or configuration changes.

[0003] As wind turbines become larger, the converters installed within them also become larger, taking up space above the transformer or the space needed for installing the tools required to disassemble the transformer. Replacing the transformer requires first using large hoisting equipment to remove the converter, and then either hoisting the transformer itself or using disassembly tools to remove it. This necessitates the use of large equipment for hoisting operations, making wind turbine modifications and maintenance inconvenient. Utility Model Content

[0004] The present invention aims to overcome the inconvenience of modifying or maintaining existing fans by providing a fan and its rear frame assembly.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A rear frame assembly for a wind turbine includes a rear frame, a converter, and a transformer. The transformer is detachably mounted on the rear frame and located below the converter. The rear frame has an inlet / outlet opening for the transformer to enter and exit along the height direction of the rear frame. The converter is movably mounted on the rear frame along the length direction of the rear frame. The converter has a blocking position and a clearance position on its movement path.

[0007] When the converter is in the blocked position, the converter and the inlet / outlet opening at least partially overlap along the length direction;

[0008] When the converter is in the avoidance position, the converter and the inlet / outlet opening are offset along the length direction to allow the transformer to enter and exit through the inlet / outlet opening.

[0009] In this design, the converter is movably mounted on the rear frame along its length. When the transformer needs to be disassembled, the converter is moved from the obstructed position to a cleared position to avoid obstructing the access opening. This facilitates the disassembly or installation of the transformer at the access opening. During this process, it is not necessary to remove and lift the converter first, and large lifting equipment is not required to lift the converter. This makes the disassembly or installation of the transformer convenient and cost-effective, thereby making the modification or maintenance of the wind turbine more convenient.

[0010] Preferably, the rear frame is provided with a guide extending along the length direction, and the converter is provided with a movable member, which is movably disposed along the guide.

[0011] Preferably, the moving element is a slider or a roller.

[0012] Preferably, the guide includes a groove, and at least a portion of the movable member is located within the groove.

[0013] In this design, the moving parts are prevented from detaching from the guide members during their movement along the length direction, thus improving the reliability of the guide.

[0014] Preferably, the rear rack assembly further includes a mounting bracket, on which the converter is movably mounted along the length direction, and the converter and the guide are mounted on the rear rack via the mounting bracket.

[0015] Preferably, the guide includes a groove, at least a portion of the movable member is located within the groove, and the movable member has gaps between its two sides along the width direction and the sidewalls of the groove.

[0016] In this design, the gap allows for sufficient clearance between the moving parts and the inverter relative to the guide parts, ensuring smooth and reliable movement of the inverter along the guide parts.

[0017] Preferably, the rear rack assembly further includes a drive mechanism mounted on the rear rack for driving the converter to move along the guide.

[0018] Preferably, the drive mechanism includes a meshing drive screw and a drive nut, the drive screw being rotatably fixed to the rear frame, the drive nut being fixed to the converter, and the end of the drive screw being provided with a drive operating part for mounting a rotating tool.

[0019] Preferably, the drive mechanism is detachably connected to the rear frame and the converter.

[0020] In this design, the drive mechanism can be removed when not in use, thus avoiding obstruction of the maintenance of the wind turbine structure; on the other hand, it facilitates the maintenance or replacement of the drive mechanism.

[0021] Preferably, the drive mechanism is disposed on one side of the converter along the width direction.

[0022] This design facilitates the disassembly, assembly, and maintenance of the drive mechanism.

[0023] Preferably, the rear rack assembly further includes a mounting bracket, on which the converter is movably mounted along the length direction, and the converter and the drive mechanism are mounted on the rear rack via the mounting bracket.

[0024] Preferably, the guide member is disposed at the top of the rear frame, and the movable member is disposed at the bottom of the converter. The guide member and the movable member are in contact with each other on opposite surfaces along the height direction. The rear frame assembly further includes a lifting mechanism, which is mounted on the rear frame and is used to lift the converter and the movable member along the height direction. The movable member has a contact position and a suspended position on the lifting path. When the movable member is in the contact position, it is in contact with the guide member. When it is in the suspended position, a suspended gap is formed between the movable member and the guide member.

[0025] In this design, when the moving part is in a suspended position, a gap is formed between it and the guide part, and the two do not contact each other. This can prevent the converter and the moving part from being pressed on the guide part for a long time, which could cause the moving part or the guide part to deform or be damaged.

[0026] Preferably, the lifting mechanism includes a lifting screw and a lifting nut that mesh with each other. The lifting screw is fixed on the rear frame, and the lifting nut is disposed on the lifting screw. The outer periphery of the lifting nut is provided with a lifting operating part for mounting a rotating tool. The lifting nut is used to drive the converter to move up and down along the height direction.

[0027] Preferably, the lifting mechanism further includes a sleeve, which is sleeved on the top of the lifting nut. The top of the sleeve has a lifting contact plane for contacting the bottom of the converter, and the lifting operating part is located outside the sleeve.

[0028] Preferably, the lifting mechanism is detachably mounted on the rear frame.

[0029] Preferably, a pad is detachably mounted on the bottom of the converter, and when the moving part is in the suspended position, the converter is fixed to the rear frame by the pad. The pad is provided on both sides of the converter along the width direction and / or length direction.

[0030] In this solution, a pad is installed to fix and support the converter on the rear frame when the converter is in a suspended position, which can make the support of the converter reliable.

[0031] Preferably, the rear rack assembly further includes a mounting bracket, on which the converter is movably mounted along the length direction, and the converter and the lifting mechanism are mounted on the rear rack via the mounting bracket.

[0032] Preferably, the rear rack assembly further includes a mounting bracket, on which the converter is movably mounted along the length direction, and the converter is mounted on the rear rack via the mounting bracket.

[0033] In this solution, the inverter is mounted on the rear rack using a mounting bracket, which reduces the need for modifications to the rear rack structure and lowers the cost and difficulty of improving the rear rack components.

[0034] Preferably, the transformer and the shielding position are located close to the tail of the rear frame along the length direction, and the avoidance position is located at the tail of the rear frame along the length direction.

[0035] In this design, the transformer and the shielding position are located close to the tail of the rear frame along the length direction, so that when the converter is in the shielding position, the transformer can maintain a preset distance from the tail of the rear frame along the length direction. On the one hand, this can improve the load-bearing condition of the rear frame; on the other hand, the tail of the rear frame can be used for personnel to walk through and maintain the structure of the wind turbine.

[0036] A wind turbine includes a nacelle, and the wind turbine further includes a rear frame assembly of the wind turbine as described in any of the above technical solutions, the rear frame assembly being disposed within the nacelle.

[0037] The positive and progressive effects of this utility model are as follows:

[0038] By movably mounting the converter on the rear frame along its length, when the transformer needs to be disassembled, the converter can be moved from an obstructed position to a cleared position to avoid blocking the access opening. This facilitates the disassembly or installation of the transformer at the access opening, eliminating the need to remove and lift the converter first. This eliminates the need for large lifting equipment to remove the converter, making the disassembly or installation of the transformer convenient and cost-effective, thereby making the modification or maintenance of the wind turbine more convenient. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the rear rack assembly in Example 1;

[0040] Figure 2 This is a schematic diagram of the rear rack assembly in Example 1;

[0041] Figure 3 This is a schematic diagram of the rear rack assembly in Example 1;

[0042] Figure 4for Figure 3 Enlarged view of section C;

[0043] Figure 5 for Figure 1 Enlarged view of section A in the middle;

[0044] Figure 6 for Figure 1 Enlarged view of section B;

[0045] Figure 7 This is a schematic diagram of the converter and the structure installed on it in Example 1;

[0046] Figure 8 This is an exploded view of the guide mechanism in Example 1;

[0047] Figure 9 This is a schematic diagram of the mounting bracket and guide components in Example 1;

[0048] Figure 10 This is a schematic diagram of the mounting bracket for Example 1;

[0049] Figure 11 This is a schematic diagram of the mounting bracket for Example 1;

[0050] Figure 12 This is a schematic diagram of the mounting bracket for Example 1;

[0051] Figure 13 This is a schematic diagram of the drive mechanism in Example 1;

[0052] Figure 14 for Figure 13 Enlarged view of section D in the middle;

[0053] Figure 15 This is a schematic diagram of the lifting mechanism in Example 1;

[0054] Figure 16 This is a sectional view of the lifting mechanism in Example 1;

[0055] Figure 17 This is a schematic diagram of the converter and its mounting structure in Example 2;

[0056] Figure 18 for Figure 17 Enlarged view of section E in the middle;

[0057] Figure 19 This is a schematic diagram of the converter and its mounting structure in Example 2;

[0058] Figure 20 for Figure 19 Enlarged view of section F in the middle.

[0059] Explanation of reference numerals in the attached figures:

[0060] Rear rack assembly 1000;

[0061] Rear frame 1;

[0062] Converter 2, Transformer 3, Lifting Unit 31;

[0063] Guide mechanism 4, guide component 41, moving component 42;

[0064] Mounting bracket 5, first crossbeam 51, first longitudinal beam 52, second longitudinal beam 53, second crossbeam 54, reinforcing plate 55, first support leg 56, second support leg 57, first mounting part 581, second mounting part 582, third mounting part 583, clearance part 59;

[0065] Drive mechanism 6, drive screw 61, drive operating part 611, nut seat 62, bearing 63, drive pad 64;

[0066] Lifting mechanism 7, lifting screw 71, lifting nut 72, lifting operating part 721, sleeve 73, lifting contact plane 731, lifting pad 74;

[0067] Pad 8, First Pad 81, Second Pad 82.

[0068] Length direction L, width direction W, height direction H. Detailed Implementation

[0069] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0070] Example 1

[0071] This embodiment provides a rear frame assembly for a wind turbine. Figures 1-16 This is a schematic diagram of this embodiment. The length, width, and height directions of the rear frame are L, W, and H, respectively.

[0072] like Figures 1-3 The rear rack assembly 1000 includes a rear rack 1, a converter 2, and a transformer 3. The transformer 3 is detachably mounted on the rear rack 1 and located below the converter 2. The rear rack 1 is provided with an inlet / outlet opening, and the transformer 3 can enter and exit through the inlet / outlet opening along the H direction. The converter 2 is movably mounted on the rear rack 1 along the L direction, and the converter 2 has a blocking position and an avoidance position on the movement path.

[0073] like Figure 1 , Figure 2 The converter 2 is in the blocked position. At this time, the converter 2 and the inlet / outlet opening at least partially overlap in the L direction and at least partially overlap in the W direction, blocking at least part of the inlet / outlet opening.

[0074] When converter 2 is in the clearance position, converter 2 and the inlet / outlet opening are offset along the L direction, without obstructing the inlet / outlet opening, allowing transformer 3 to enter and exit through the opening. When it is necessary to disassemble or install transformer 3, converter 2 can be moved to the clearance position without first removing and hoisting converter 2, and without using large hoisting equipment to remove converter 2. This makes the disassembly or installation of transformer 3 convenient and cost-effective, thereby facilitating the modification or maintenance of the wind turbine.

[0075] In this embodiment, the avoidance position is located at the rear of the rear frame 1, that is, along the L direction, at the rear frame 1. Figure 1 , Figure 2 The right end in the direction shown. For example... Figure 1 , Figure 2 The transformer 3 and the shielding position are located along the L direction near the rear of the rear frame 1, that is, along the L direction near the rear frame 1. Figure 1 , Figure 2 The right end is positioned in the direction shown, so that when the converter 2 is in the blocked position and the transformer 3 can maintain a preset distance from the right end of the rear frame 1 along the L direction, on the one hand, it can improve the load condition of the rear frame 1; on the other hand, the tail end of the rear frame 1 can be used for personnel to walk and maintain the structure of the wind turbine.

[0076] like Figures 1-3 The rear rack assembly 1000 also includes a mounting bracket 5, which is mounted on the rear rack 1. The converter 2 is movably mounted on the mounting bracket 5 along the L direction, so as to be indirectly movably mounted on the rear rack 1. This can reduce the modification of the structure of the rear rack 1 and reduce the improvement cost and difficulty of the rear rack assembly 1000.

[0077] like Figure 10 The mounting frame 5 includes a first crossbeam 51, a first longitudinal beam 52, a second longitudinal beam 53, a second crossbeam 54, a first support leg 56, and a second support leg 57; the first crossbeam 51 and the second crossbeam 54 extend along the W direction, and the first longitudinal beam 52 and the second longitudinal beam 53 extend along the L direction. These four types of beams are fixed in a frame structure. Figure 11 , Figure 12 The bottom of the first crossbeam 51 is fixed to the rear frame 1 by the first support leg 56, and the bottom of the second crossbeam 54 is fixed to the rear frame 1 by the second support leg 57.

[0078] like Figure 4 , Figure 8 The rear frame assembly 1000 also includes a guide mechanism 4, which includes a guide member 41 and a moving member 42. For example... Figure 4 The rear frame 1 is provided with a guide member 41, which extends along the L direction; such as Figure 4 , Figure 7The converter 2 is equipped with a movable component 42; the movable component 42 is movably disposed along the guide component 41, allowing the converter 2 to move relative to the rear frame 1 in the L direction. Figure 4 , Figure 9 The guide component 41 is mounted on the mounting bracket 5, which in turn mounts it onto the rear frame 1. In this embodiment, the moving component 42 is a slider, while in embodiment 2, the moving component 42 is a roller. In this embodiment, there are four sets of guide mechanisms 4, spaced apart along the W direction, ensuring smooth and reliable guidance.

[0079] like Figure 4 , Figure 8 The guide member 41 is provided with a groove, and part of the moving member 42 is located within the groove. This prevents the moving member 42 from detaching from the guide member 41 during movement along the L direction, thus improving the reliability of the guide. Figure 4 The movable component 42 has gaps on both sides along the W direction and on the sidewalls of the slide groove, allowing for the tilting of the movable component 42 and the converter 2 relative to the guide component 41, thus ensuring smooth and reliable movement of the converter 2 along the guide component 41. In this embodiment, the slide groove of the guide component 41 is U-shaped, resulting in a simple structure and reliable guidance. The movable component 42 is shorter than the guide component 41, avoiding the movable component 42 occupying unnecessary movement space and making the structure compact.

[0080] like Figure 1 , Figure 5 The rear rack assembly 1000 also includes a drive mechanism 6, which is mounted on the rear rack 1 and used to drive the converter 2 to move along the guide member 41. Specifically, the drive mechanism 6 is mounted on the rear rack 1 via a mounting bracket 5. In this embodiment, a set of drive mechanisms 6 is provided on each side of the converter 2 along the W direction.

[0081] like Figure 13 The drive mechanism 6 includes a meshing drive screw 61 and a drive nut, such as... Figure 4 The drive screw 61 is rotatably fixed to the mounting bracket 5, such as... Figure 5 The drive nut is fixed to the converter 2, and rotating the drive screw 61 causes the drive nut to move the converter 2 along the L direction. In other embodiments, the drive mechanism 6 may be, but is not limited to, a screw nut, a hydraulic rod or a pneumatic rod, or an electric-to-rotary linear conversion mechanism to drive the converter 2.

[0082] like Figure 14 The end of the drive screw 61 is provided with a drive operation part 611, which is used to install tools to rotate the drive screw 61. In this embodiment, the drive operation part 611 is specifically a hexagonal prism to facilitate rotation with a wrench.

[0083] In this embodiment, the drive mechanism 6 is detachably mounted relative to the converter 2. On the one hand, the drive mechanism 6 can be removed when not in use, avoiding obstruction to the maintenance of the wind turbine structure; on the other hand, it facilitates the maintenance or replacement of the drive mechanism 6. Specifically, the drive mechanism 6 is located on one side of the converter 2 along the W direction, making disassembly, assembly, and maintenance operations convenient.

[0084] The drive mechanism 6 also includes a nut seat 62, a bearing 63, and a drive pad 64; the drive pad 64 is used to be detachably fixed on the mounting bracket 5, the bearing seat 63 of the bearing 63 is fixed on the drive pad 64, and the installation height of the drive mechanism 6 can be adjusted by the drive pad 64; the drive screw 61 rotates relative to the mounting bracket 5 and the rear frame 1 through the bearing 63; the drive nut is fixed on the nut seat 62 and is mounted on the converter 2 through the nut seat 62.

[0085] like Figure 4 , Figure 9 The guide 41 is located on the top of the rear frame 1, such as Figure 4 , Figure 7 The movable part 42 is disposed at the bottom of the converter 2, and the guide part 41 and the movable part 42 are in contact with each other on opposite surfaces along the height direction so as to move relative to each other along the L direction.

[0086] like Figure 5 The rear frame assembly 1000 also includes a lifting mechanism 7, which is mounted on the rear frame 1 and used to lift the converter 2 and the moving member 42 along the height direction. The moving member 42 has a contact position and a suspended position on the lifting path. When the converter 2 needs to move along the L direction, the moving member 42 can be held in the contact position along the H direction, so that the moving member 42 contacts the guide member 41 and can move along the guide member 41. When the converter 2 does not need to move along the L direction, the moving member 42 is set in the suspended position along the H direction; as... Figure 4 When the moving part 42 is in a suspended position, a gap is formed between it and the guide part 41 along the H direction, preventing them from contacting each other. This avoids the converter 2 being pressed against the moving part 42 and the guide part 41 for a long time, which could cause deformation or damage to the moving part 42 or the guide part 41. In actual use, the moving part 42 only needs to be suspended a few millimeters above the guide part 41. In this embodiment, the lifting mechanism 7 is detachably mounted on the mounting frame 5, so as to be indirectly detachably mounted on the rear frame 1. In other embodiments, the lifting mechanism 7 may not be provided, so that the moving part 42 and the guide part 41 always remain in contact; furthermore, a locking mechanism can be provided to lock the moving part 42 or the converter 2 relative to the rear frame 1 to prevent the moving part 42 and the converter 2 from shaking when the converter 2 does not need to move. In this embodiment, there are four sets of lifting mechanisms 7, and two sets of guide mechanisms 4 are provided on each side of the converter 2 along the W direction, so that the lifting of the converter 2 is smooth and reliable.

[0087] like Figure 15 , Figure 16 The lifting mechanism 7 includes a meshing lifting screw 71 and a lifting nut 72, such as... Figure 5 The lifting screw 71 is fixed to the rear frame 1 by the mounting bracket 5. The lifting nut 72 is located at the upper end of the lifting screw 71. Rotation of the lifting nut 72 drives the lifting nut 72 and the converter 2 to move up and down in the H direction. Specifically, the lifting nut 72 is mounted on the mounting bracket 5 by a lifting pad 74, which can adjust the installation height of the lifting mechanism 7. Figure 10 The first longitudinal beam 52 of the mounting bracket 5 is provided with a clearance part 59, specifically a through hole, which is used to allow the lifting nut 72 to move up and down inside.

[0088] like Figure 15 The lifting nut 72 has a lifting operation part 721 on its outer periphery for mounting a rotating tool. In this embodiment, the lifting operation part 721 is specifically hexagonal prism-shaped and is used to mount a wrench to rotate the lifting nut 72. In other embodiments, the lifting mechanism 7 may be, but is not limited to, a jack, a nut and screw mechanism, etc.

[0089] like Figure 15 , Figure 16 The lifting mechanism 7 also includes a sleeve 73, which is fitted onto the top of the lifting nut 72. The top of the sleeve 73 has a lifting contact plane 731. The lifting mechanism 7 contacts the bottom of the converter 2 through the lifting contact plane 731, ensuring smooth and reliable contact. The lifting operation part 721 is located outside the sleeve 73 for easy tool installation. In other embodiments, the sleeve 73 may be omitted, and the top of the lifting nut 72 can directly contact the bottom of the converter 2.

[0090] like Figure 7 Two types of pads 8 are detachably installed at the bottom of the converter 2, namely a first pad 81 and a second pad 82, as shown below. Figure 4 ,like Figure 6 When the movable part 42 is in the suspended position, the converter 2 is fixed to the mounting bracket 5 by the pad 8. The first pad 81 is L-shaped, such as... Figure 7 The converter 2 has a first pad 81 on both sides along the L direction and a second pad 82 on both sides along the W direction. When the movable part 42 on the converter 2 is in the suspended position, the converter 2 is fixedly supported on the rear frame 1 by the mounting bracket 5, which can make the support of the converter 2 reliable.

[0091] like Figure 10The mounting bracket 5 is provided with a first mounting part 581 and a second mounting part 582, specifically mounting holes, outlined by a dashed rectangular frame. The first mounting part 581 is used to mount the first pad 81, and the second mounting part 582 is used to mount the second pad 82. The mounting bracket 5 is provided with a reinforcing plate 55, and part of the first mounting part 581 is disposed on the reinforcing plate 55 to improve the structural strength at this point to support the first pad 81 and the converter 2.

[0092] Example 2

[0093] This embodiment provides a rear frame assembly 1000 for a wind turbine. Figures 17-20 This is a schematic diagram of this embodiment. The main difference between this embodiment and Embodiment 1 lies in the different configuration of the moving part 42, such as... Figure 18 , Figure 20 In this embodiment, the movable component 42 is a roller, which can be embedded in the bottom of the converter 2. Other structures in this embodiment can be referred to in Embodiment 1.

[0094] After the rear frame assembly of this embodiment is installed on the wind turbine, it can be operated using the following method:

[0095] When the wind turbine is working normally, the converter is fixed to the mounting bracket by the pad, so that the roller is in a suspended position. There is a gap between the bottom of the roller and the guide component below the converter. The gap is usually a few millimeters to avoid the converter and roller pressing on the guide component for a long time, which would cause the guide component to deform, and also to prevent the converter and roller from shaking.

[0096] When it is necessary to disassemble the transformer, remove the pad between the converter and the transformer, lower the converter through the lifting mechanism so that the roller is in contact with the guide, and drive the converter to move along the guide through the drive mechanism. The roller rolls along the guide and moves the converter to the avoidance position.

[0097] Example 3

[0098] This embodiment provides a method for disassembling or installing a transformer 3, which can be used to disassemble or install the transformer 3 in Embodiment 1 or Embodiment 2.

[0099] The steps for disassembling transformer 3 are as follows:

[0100] S11: Power off the fan, remove or disconnect the pipeline that affects the movement of the converter 2; remove the fasteners connecting the pad 8 on the converter 2 and the mounting bracket 5, so that there is no fixed connection between the converter 2 and the mounting bracket 5 and the rear frame 1.

[0101] S12: Install the four sets of lifting mechanisms 7 onto the mounting bracket 5 using fasteners, so that the four sets of lifting mechanisms 7 are located on both sides of the converter 2 along the W direction. Then, use a wrench or other tools to rotate the lifting nut 72 of the lifting mechanism 7 and lift the converter 2 upward along the H direction so that the moving part 42 on the converter 2 is in a suspended position. Generally, it is only necessary to lift it a few millimeters.

[0102] S13: Remove the pad 8 at the bottom of converter 2;

[0103] S14: The lifting nut 72 of the rotating lifting mechanism 7 is used to lower the converter 2 so that the moving part 42 contacts the corresponding guide part 41 respectively, so that the moving part 42 on the converter 2 is in the contact position.

[0104] S15: Use fasteners to fix the drive nuts of the two sets of drive mechanisms 6 to both sides of the converter 2 along the W direction, and fix the drive pad 64 of the drive mechanism 6 to the mounting bracket 5.

[0105] S16: By turning the drive screw 61 with a wrench or other tools, the drive nut and converter 2 move along the L direction. The converter 2, along with the moving part 42, slides along the L direction in the groove of the guide part 41, moving the converter 2 from the blocked position to the avoidance position, so that the converter 2 and the corresponding inlet and outlet openings of the transformer 3 are misaligned along the L direction.

[0106] S17: After the converter 2 is moved to the clearance position, the tool for disassembling the transformer 3 (the tool for disassembling the transformer 3, hereinafter referred to as the disassembly tool) is installed on the mounting frame 5 or the rear frame 1 using the space freed up, and the wire rope hook on the disassembly tool is connected to the hoisting part 31 at the top of the transformer 3.

[0107] S18: Remove the fasteners connecting transformer 3 and rear frame 1, and disassemble the external parts of transformer 3; after confirming that the hoisting space is safe, use the wire rope hook on the disassembly tool to lift transformer 3 from the inlet / outlet opening and lower transformer 3 to the ground or platform.

[0108] After disassembling transformer 3, the steps for reinstalling transformer 3 are as follows:

[0109] S21: Connect the wire rope hook on the disassembly fixture to the lifting part 31 of the replaced or repaired transformer 3, and lift the transformer 3 onto the rear frame 1 by disassembling the fixture;

[0110] S22: Install the fasteners for the transformer 3 and the rear frame 1, and install other peripheral components of the transformer 3;

[0111] S23: Remove and move away the relevant parts of the disassembly fixture;

[0112] S24: Rotate the drive screw 61 of the drive mechanism 6 with a wrench or other tools to reset the converter 2 from the avoidance position back to the blocking position; after resetting, remove the drive nut in the drive mechanism 6 and the fasteners connecting both sides of the converter 2.

[0113] S25: Rotate the lifting nut 72 of the lifting mechanism 7 so that the lifting mechanism 7 pushes the converter 2 upward along the H direction, so that the moving part 42 and the guide part 41 separate to form a suspended gap, and the moving part 42 is in a suspended position.

[0114] S26: Place the pad 8 at the bottom of the converter 2;

[0115] S27: Rotate the lifting nut 72 of the lifting mechanism 7 to lower the converter 2; then fix the pad 8 at the bottom of the converter 2 to the mounting bracket 5 with fasteners. At this time, the moving part 42 is in a suspended position and there is still a gap between it and the guide part 41.

[0116] S28: Remove the lifting mechanism 7, remove the drive mechanism 6, and install pipelines and other components.

[0117] like Figure 10 The mounting bracket 5 is provided with a third mounting part 583, which is a mounting hole, outlined by a rectangular frame with dashed lines in the figure. In this embodiment, the disassembly fixture is installed at the third mounting part 583.

[0118] By installing the rear frame assembly 1000 of this utility model into the nacelle of the wind turbine, the cost of changing and maintaining the transformer 3 can be reduced, and the convenience of operation can be improved.

[0119] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A rear frame assembly for a wind turbine, characterized in that, It includes a rear frame, a converter, and a transformer. The transformer is detachably mounted on the rear frame and located below the converter. The rear frame has an access opening for the transformer to enter and exit along the height direction of the rear frame. The converter is movably mounted on the rear frame along the length direction of the rear frame. The converter has a blocking position and a avoidance position on the movement path. When the converter is in the blocked position, the converter and the inlet / outlet opening at least partially overlap along the length and width directions of the rear frame; When the converter is in the avoidance position, the converter and the inlet / outlet opening are offset along the length direction to allow the transformer to enter and exit through the inlet / outlet opening.

2. The rear frame assembly of the wind turbine as described in claim 1, characterized in that, The rear frame is provided with a guide extending along the length direction, and the converter is provided with a movable component, which is movably disposed along the guide.

3. The rear frame assembly of the wind turbine as described in claim 2, characterized in that, The moving component is a slider or a roller; And / or, the guide includes a groove, and at least a portion of the moving member is located within the groove; And / or, the rear rack assembly further includes a mounting bracket on which the converter is movably mounted along the length direction, and the converter and the guide are mounted on the rear rack via the mounting bracket.

4. The rear frame assembly of the wind turbine as described in claim 2, characterized in that, The guide includes a groove, at least a portion of the movable member is located within the groove, and the movable member has gaps between its two sides along the width direction and the sidewalls of the groove.

5. The rear frame assembly of the wind turbine as described in claim 2, characterized in that, The rear rack assembly also includes a drive mechanism mounted on the rear rack for driving the converter to move along the guide.

6. The rear frame assembly of the wind turbine as described in claim 5, characterized in that, The drive mechanism includes a meshing drive screw and a drive nut. The drive screw is rotatably fixed on the rear frame, and the drive nut is fixed on the converter. The end of the drive screw is provided with a drive operating part for mounting a rotating tool. And / or, the drive mechanism is detachably connected relative to the rear frame and the converter; And / or, the drive mechanism is disposed on one side of the converter along the width direction; And / or, the rear rack assembly further includes a mounting bracket on which the converter is movably mounted along the length direction, and the converter and the drive mechanism are mounted on the rear rack via the mounting bracket.

7. The rear frame assembly of the wind turbine as described in claim 2, characterized in that, The guide member is disposed at the top of the rear frame, and the moving member is disposed at the bottom of the converter. The guide member and the moving member are in contact with each other on opposite surfaces along the height direction. The rear frame assembly also includes a lifting mechanism, which is mounted on the rear frame and is used to lift the converter and the moving member along the height direction. The moving member has a contact position and a suspended position on the lifting path. When the moving member is in the contact position, it is in contact with the guide member. When it is in the suspended position, a suspended gap is formed between the moving member and the guide member.

8. The rear frame assembly of the wind turbine as described in claim 7, characterized in that, The lifting mechanism includes a meshing lifting screw and a lifting nut. The lifting screw is fixed to the rear frame, and the lifting nut is disposed on the lifting screw. The outer periphery of the lifting nut is provided with a lifting operating part for mounting a rotating tool. The lifting nut is used to drive the converter to move up and down along the height direction. The lifting mechanism also includes a sleeve, which is sleeved on the top of the lifting nut. The top of the sleeve has a lifting contact plane for contacting the bottom of the converter. The lifting operating part is located outside the sleeve. And / or, the lifting mechanism is detachably mounted on the rear frame; And / or, a pad is detachably mounted on the bottom of the converter, and when the moving part is in the suspended position, the converter is fixed to the rear frame by the pad, and the pad is provided on both sides of the converter along the width direction and / or length direction; And / or, the rear rack assembly further includes a mounting bracket on which the converter is movably mounted along the length direction, and the converter and the lifting mechanism are mounted on the rear rack via the mounting bracket.

9. The rear frame assembly of the wind turbine as described in claim 1, characterized in that, The rear rack assembly also includes a mounting bracket, on which the converter is movably mounted along the length direction; the converter is mounted on the rear rack via the mounting bracket. And / or, the transformer and the shielding position are located close to the tail of the rear frame along the length direction, and the avoidance position is located at the tail of the rear frame along the length direction.

10. A wind turbine comprising a nacelle, characterized in that, The wind turbine further includes a rear frame assembly of the wind turbine as described in any one of claims 1-9, the rear frame assembly being disposed within the nacelle.

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