Cable suspending and twisting device and wind generating set

Abstract

The cable hanging and twisting device comprises a bearing inhaul cable and cable fixing discs, the bearing inhaul cable is vertically arranged in the center of a tower, the upper end of the bearing inhaul cable is fixedly connected with a base, the cable fixing discs are fixed to the bearing inhaul cable in a clamped mode, the cable fixing discs clamp and fix a cable, and the cable fixing discs are connected with the bearing inhaul cable in a clamped mode. The cable is distributed around the load-bearing inhaul cable. When not yawing, the cable between the cable fixing discs is loose. A through hole is formed in the middle of the maintenance platform so that the bearing inhaul cable can penetrate through the through hole, the cable fixing disc close to the maintenance platform is fixedly connected with the rotary support, and the rotary support rotates around the middle of the maintenance platform through the rotary bearing. The cable hanging and twisting device can greatly reduce stretching of the cable caused by gravity load and avoid heat accumulation caused by dense arrangement. Main connecting points of the cable fixing device are located in the middle of the maintenance platform, and maintenance difficulty and workload are reduced. The cable fixing device is simple in structure and convenient to install and maintain.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power generation, and in particular relates to a cable suspension and torsion device and a wind power generator set. Background Art

[0002] Wind power is the most valuable and commercially viable power generation method in the renewable energy sector. Available wind energy is widely distributed around the world and has huge reserves.

[0003] Wind turbines use impellers to convert wind energy into mechanical energy, and the generator at the top of the tower converts the mechanical energy into electrical energy, and then transmits the electrical energy from the top of the tower to the bottom of the tower through cables. Since the distance from the top to the bottom of the tower is long, the cable is long, so the cable needs to be fixed to restrain the movement of the cable in the tower, and the problem of cable load-bearing needs to be solved. In addition, the cabin at the top of the wind turbine needs to yaw, causing the cable to twist. The conventional cable fixing scheme is: 1) Divide the cable into a twisting section and a straight transmission section; 2) Set a twisting section near the top of the tower, and the cable of the twisting section uses a material with good elasticity (insulating layer, etc.), and reserve a certain twisting length, so that the cabin yaw angle can reach 540 degrees or even more than 720 degrees. The twisting section cable is connected to the straight transmission section cable through a switching device, and the straight transmission section cable is fixedly connected to the inner wall of one side of the tower through a fixed structure.

[0004] The conventional scheme mentioned above leads to some technical problems: 1) The cable of the twisting section reserves a certain twisting length, so the cable of the twisting section is usually kept in a loose state. In the conventional scheme, the cable of the twisting section adopts a relatively simple and direct solution when fixing it, such as a tight sleeve to support the cable and connect it to the base. When the wind turbine is running, the nacelle will shake in multiple directions, front and back, left and right. Driven by the nacelle, the cable will also shake, causing mutual friction with the tight sleeve or other clamping structure. After a period of time, the insulation layer will wear and fail. In some special cases, there will even be a short impact between the cable and the tight sleeve or other clamping structure, which will aggravate the wear of the cable. 2) The cables of the twisting section and the straight transmission section are densely arranged and close to each other (especially the cables of the twisting section), which leads to heat accumulation between the cables when transmitting power, reducing the service life of the cables. 3) As the rated power of wind turbines continues to increase, the specifications of the cables are also continuously improved, and the height of the tower is also continuously increasing, and the weight of the cables is getting heavier (even each cable weighs more than one ton). Excessive gravity load causes the cable to stretch and deform during long-term operation, reducing the service life of the cable.

[0005] Some new technical solutions have improved the cable fixation of the twisting section: a load-bearing wire (or load-bearing cable) is set in the twisting section, and the cables are fixed around the load-bearing wire (or load-bearing cable) through a fixed structure and keep a certain distance between each other. The load-bearing wire (or load-bearing cable) shares most of the gravity load of the cable. However, this solution still maintains the overall solution of the twisting section and the straight transmission section, and does not solve the relevant technical problems of the straight transmission section cable.

[0006] There are also some new technical solutions that are out of the scope of the overall solution of the twisting section and the straight transmission section, and all cables are set in the middle of the tower. Use multiple flexible cables to connect the bottom and top of the tower. The bottom of the flexible cable is connected to the inner wall of the tower through an elastic fixing (such as an elastic rope), and the cable is fixed to the flexible cable through a spacer element. All flexible cables and cables will twist when the cabin yaws, causing the elastic fixing to twist and stretch to achieve the effect of compensating for the angular deflection caused by yaw. However, this structural solution contains many parts. In addition to the above, there are also multiple guide elements, and the guide elements are also connected to the inner wall of the tower through some elastic connectors, resulting in a considerable number of fixing points with the tower, and the workload of installation and maintenance is large. When the flexible cables and cables are twisted during yaw, a large number of elastic connectors in the elastic fixings and guide elements need to be elongated and deformed. The elastic modulus of the elastic fixings and elastic connectors needs to be appropriately selected, and the preload should be maintained at an appropriate value, otherwise it will bring greater resistance to yaw, or the movement of the flexible cables and cables inside the tower cannot be well restricted. Therefore, it is necessary to regularly maintain numerous elastic connectors, which increases the workload.

[0007] For the fixing of cables, new solutions are needed to achieve the following technical effects: 1) Greatly reduce the mutual friction and impact between the clamping structure and the cable; 2) Reduce the stretching of the cable itself by the gravity load; 3) Avoid heat accumulation caused by dense cable arrangement; 4) Reduce the number of connection points between the cable fixing device and the tower, reduce risk points and maintenance workload; 5) Simple structure, small number of parts, easy installation and maintenance. Summary of the invention

[0008] In order to solve at least one technical problem in the background technology, a first aspect provides a cable suspension and torsion device, which at least includes: a load-bearing cable and a cable fixing plate;

[0009] The load-bearing cable is vertically arranged at the center of the wind turbine tower, and the upper end of the load-bearing cable is fixedly connected to the base of the wind turbine;

[0010] The plurality of cable fixing discs are respectively clamped and fixed on the load-bearing cables, and the cable fixing discs clamp and fix the cables, and the cables are distributed around the load-bearing cables;

[0011] When the wind turbine set is in an initial state without yaw, the cable between the two cable fixing plates is loose;

[0012] A multi-layer maintenance platform is arranged inside the wind turbine tower, and a through hole is arranged in the middle of the maintenance platform so that the load-bearing cable can pass through; the cable fixing plate close to the maintenance platform is fixedly connected to the slewing bracket, and the slewing bracket rotates around the middle of the maintenance platform through the slewing bearing.

[0013] In a further technical solution, the cable fixing disk is composed of a cable fixing block and a cable fixing block; the cable fixing block surrounds the cable fixing block in the middle.

[0014] In a further technical solution, the cable fixing block adopts a segmented structure, and the cable fixing block is composed of at least a pair of cable fixing sections connected by bolts.

[0015] The cable fixing block adopts a segmented structure and is composed of a plurality of pairs of cable fixing sections connected by bolts.

[0016] In a further technical solution, the bolts used to connect the multiple pairs of cable fixing sections also pass through the cable fixing block, so that the cable fixing block is connected to the cable fixing block.

[0017] The swivel bracket is composed of a plurality of bracket units, each bracket unit is a profile with the same specification; the swivel bracket is only connected to the cable fixing block of the cable fixing disk.

[0018] In a further technical solution, one end of each of the bracket units is connected to the slewing bearing, and the other end of each of the units is spliced ​​with the adjacent bracket units to form a mutual supporting structure.

[0019] The fixed ring of the slewing bearing is connected to the middle part of the maintenance platform, and the rotating ring of the slewing bearing is connected to the slewing bracket.

[0020] In a second aspect, a wind turbine generator set is provided, wherein the wind turbine generator set comprises the cable suspension and torsion device described above.

[0021] The beneficial effects of the utility model are as follows: the gravity of the cable is transferred to the load-bearing cables in sections through multiple cable fixing disks, thereby reducing the stretching of the cable itself by the cable gravity load; the cable fixing disks disperse and fix the cables around the load-bearing cables, thereby avoiding heat accumulation caused by dense arrangement of the cables, and also reducing the mutual friction between the clamping structure and the cables; the entire cable fixing device has almost no connection with the inner wall of the tower, and the main connection points are located in the middle of the maintenance platform, thereby reducing the difficulty and workload of maintenance; the cable fixing device has a simple structure and is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a cable suspension and twisting device according to an embodiment of the utility model;

[0023] Figure 2 This is an overall schematic diagram of a cable suspension and twisting device according to an embodiment of the utility model;

[0024] Figure 3 A schematic diagram of the installation position of a cable fixing plate of a cable suspension and torsion device according to an embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of an initial yaw state of a cable suspension and torsion device according to an embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of a cable suspension and torsion device during yaw state according to an embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of a cable fixing plate of a cable suspension and torsion device according to an embodiment of the utility model;

[0028] Figure 7 A schematic diagram of a cable fixing quick-split structure of a cable suspension and torsion device according to an embodiment of the utility model;

[0029] Figure 8 This is a schematic diagram of a rotary bracket structure of a cable suspension and torsion device according to an embodiment of the utility model;

[0030] Fig. 9 The present invention is a schematic diagram of the connection between a rotary bracket of a cable suspension and torsion device and a cable fixing plate according to an embodiment of the present invention.

[0031] Description of Figure Numbers:

[0032] 1. Load-bearing cable, 2. Cable fixing plate, 2.1. Cable fixing block, 2.11. Cable through hole, 2.2. Cable fixing block, 2.21. Cable through hole, 3. Cable, 3.1. First section of cable, 3.2. Second section of cable, 4. Maintenance platform, 4.1. Through hole, 5. Base, 6. Slewing bracket, 6.1. Bracket unit, 7. Slewing bearing, 8. Bolt, 9. Bolt hole of cable fixing section, 10. Bolt hole of cable fixing block.

[0033] It is worth noting that the above drawings are used to illustrate the features of the utility model, and are not intended to show any actual structure or reflect the size, relative proportion and other detailed information of various components. In order to more clearly show the principle of the utility model and to avoid unnecessary details that make the principle of the utility model unclear, the examples in the figures have been simplified. These illustrations will not cause inconvenience to technicians in the relevant fields in understanding the utility model, and the actual embodiment may include more modules or components. DETAILED DESCRIPTION

[0034] In order to make the purpose and technical solution of the embodiment of the utility model clearer, the embodiment of the utility model is fully described below in conjunction with the relevant drawings of the embodiment of the utility model. This patent describes only a part of the embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0035] like Figure 1 As shown, a cable suspension and torsion device comprises at least: a load-bearing cable (1) and a cable fixing disc (2).

[0036] The load-bearing cable (1), as the name implies, is used to bear weight, mainly the weight of the cable (3). The main function of the cable fixing plate (2) is to fix the cable (3) and transfer the weight of the cable (3) to the load-bearing cable (1). Therefore, the cable fixing plate (2) and the load-bearing cable (1) are the core components of the entire cable fixing device.

[0037] like Figure 2 As shown, unlike conventional technical solutions, the load-bearing cable (1) is vertically arranged at the center of the wind turbine tower, the upper end of the load-bearing cable (1) is fixedly connected to the base (5) of the wind turbine, and the bottom can be connected to the bottom of the tower (such as the bottom platform), or can be connected to the bottom of the tower or the inner wall near the bottom through a connecting structure, and this connection can be a rigid connection.

[0038] like Figure 3 As shown, the whole device comprises a plurality of cable fixing disks (2), which are clamped and fixed on the load-bearing cable (1), and the cable fixing disks (2) also clamp and fix the cables (3). There are usually a plurality of cables (3), which are distributed around the load-bearing cable (1), and a certain distance is formed between two cables.

[0039] The spacing between the two cable fixing disks (2) can be adjusted according to the height of the tower and the actual length of the cable (3). It should be confirmed that when the wind turbine is in an initial state without yaw, the cable (3) between the two cable fixing disks (2) is loose. It should be noted that when the wind turbine is in an initial state without yaw, the azimuth of the nacelle is in the position after the wind turbine is installed (usually the nacelle will face the direction of the main wind direction), and the cable (3) should not be twisted, that is, the twist angle is 0 degrees. The cable (3) between the two cable fixing disks (2) is loose, which means that the cable (3) between the two cable fixing disks (2) has a certain length margin and is not tensioned (similar to the straight transmission segment cable in the conventional technical solution). The tension of the cable (3) is 0. If the two cable fixing disks (2) twist against each other, the cable (3) between them will not be immediately stretched by force, but the length margin will be reduced, and the original loose cable (3) will be tightened. If it continues, the tension of the cable (3) will eventually be greater than 0.

[0040] In addition to the cable fixing disc (2) and the load-bearing cable (1), the cable fixing device also requires the use of a maintenance platform (4) that has been set up inside the wind turbine tower. The maintenance platform (4) has multiple layers, and a through hole (4.1) is set in the middle of each maintenance platform (4) so ​​that the load-bearing cable (1) can pass through. In addition, in some embodiments, the size of the through hole (4.1) can also allow both the cable fixing disc (2) and the cable (3) to pass through. Since the cross-sectional size of the cable (3) and the number of cables (3) are limited, the diameter of the through hole (4.1) is very small compared to the diameter of the maintenance platform (4).

[0041] like Figure 3 As shown, a cable fixing plate (2) is arranged near the maintenance platform (4). In some embodiments, the cable fixing plates (2) can be located exactly in the middle of the maintenance platform (4), that is, in the through hole (4.1) in the middle of the maintenance platform (4). The cable fixing plates (2) are fixedly connected to the slewing bracket (6). The slewing bracket (6) can rotate around the middle of the maintenance platform (4), that is, around the axis of the tower, through the slewing bearing (7). The fixed ring of the slewing bearing (7) is connected to the middle of the maintenance platform (4), and the rotating ring of the slewing bearing (7) is connected to the slewing bracket (6). Since the slewing bracket (6) can be regarded as connected to the middle of the maintenance platform (4) through the bearing, part of the weight of the cable (3) can be transferred to the slewing bracket (6) through the cable fixing plate (2), and then transferred to the maintenance platform (4).

[0042] Based on the above description of the cable fixing device, the process of twisting the cable when the nacelle is yawed can be summarized as follows:

[0043] 1) If Figure 4As shown, the top of the load-bearing cable (1) is connected to the base (5) in the cabin, and the bottom of the load-bearing cable (1) is connected to the tower, and they remain relatively still. When the cabin yaws, the top of the load-bearing cable (1) begins to twist, and the twisting state is transmitted downward as the yaw continues in one direction (for example, clockwise);

[0044] 2) If Figure 4 As shown, the first section of the cable (3.1) between the base (5) and the uppermost cable fixing plate (2) is loose before the yaw occurs. Although the cable fixing plate (2) is supported on the load-bearing cable (1), the torsion of the load-bearing cable (1) is not enough to cause the cable fixing plate (2) to rotate accordingly. The main reason is that the load-bearing cable (1) is located in the center of the cable fixing plate (2) and does not generate enough torque to drive the cable fixing plate (2) to rotate.

[0045] 3) If Figure 5 As shown, as the relative torsion between the base (5) and the uppermost cable fixing plate (2) increases, the first section of the cable (3.1) therebetween gradually changes from an initial relaxed state to a tensioned state, and after the first section of the cable (3.1) changes to the tensioned state, it can drag the uppermost cable fixing plate (2) to rotate in the yaw direction;

[0046] 4) If the yaw stops during this process, only the first section of the cable (3.1) between the base (5) and the uppermost cable fixing plate (2) becomes tensioned, and only the uppermost cable fixing plate (2) rotates due to the yaw of the cabin;

[0047] 5) If the nacelle continues to yaw, similar to the contents of parts 1) to 3) will occur between the first section of cable (3.1) between the uppermost cable fixing plate (2) and the cable fixing plate (2) below it; the same applies to the second section of cable (3.2) and the fixing plate below. That is to say, as the nacelle continues to yaw, the torsion or rotation of the load-bearing cable (1), cable (3) and cable fixing plate (2) are gradually transmitted downward from the top of the tower, and not all occur at the same time.

[0048] The advantages and benefits of the technical solution adopted by the utility model are mainly reflected in the following aspects:

[0049] 1) A plurality of cable fixing plates (2) transfer the weight of the cable (3) to the load-bearing cable (1) nearby, thereby greatly reducing the stretching of the cable (3) itself caused by the weight load of the cable (3);

[0050] 2) The cables (3) are dispersedly fixed around the load-bearing cables (1) to avoid heat accumulation caused by dense arrangement of the cables (3);

[0051] 3) The entire cable fixing device has almost no connection with the inner wall of the tower, and the main connection points are located in the middle of the maintenance platform (4), which reduces the difficulty and workload of maintenance;

[0052] 4) The cable fixing device has a simple structure and is easy to install and maintain.

[0053] like Figure 6 As shown, the cable fixing plate (2) is composed of a cable fixing block (2.1) and a cable fixing block (2.2). In general, it can be considered that the cable fixing blocks (2.2) are distributed on all sides, and the cable fixing blocks (2.2) surround the cable fixing block (2.1) in the middle. This form is consistent with the distribution form of the cables (3) and the load-bearing cables (1) mentioned above. The cable fixing block (2.1) adopts a split structure, and the cable fixing block (2.1) is composed of at least a pair of cable fixing sections connected by bolts (8). The cable fixing block (2.1) can be supported on the load-bearing cable (1) after the load-bearing cable (1) is installed. Each cable fixing section is provided with a portion of the cable through hole (2.11) required for the load-bearing cable (1) to pass through. If some embodiments use a pair of cable fixing sections to be spliced, then each cable fixing section has half of the cable through hole (2.11). As shown Figure 7 As shown, similarly, the cable fixing block (2.2) also adopts a split structure and is composed of a plurality of pairs of cable (3) fixing segments connected by bolts (8). In some embodiments, the number of cable fixing segments can be consistent with the number of cables (3), and two adjacent cable fixing blocks (2.2) complete the clamping of a cable (3), and the degree of tightening of the cable (3) can be adjusted by adjusting the bolts (8). Each cable fixing segment is provided with a portion of the cable through hole (2.21) required for the cable (3) to pass through. Unlike the cable through hole (2.11), the cable through hole (2.21) is not necessarily a round hole. In some embodiments, the cable through hole (2.21) can be an elliptical hole, and after the bolt (8) applies pre-tightening, the cable cross-section gradually becomes elliptical along with the shape of the cable through hole (2.21).

[0054] like Figure 7 As shown, considering that the cable fixing block (2.2) needs to simultaneously meet the two requirements of fixing the cable and clamping on the cable fixing block (2.1), the bolts (8) used to connect the multiple pairs of cable fixing sections pass through both the cable fixing section bolt holes (9) and the cable fixing block bolt holes (10). After the bolts (8) are pre-tightened, they not only clamp the cables (3), but also complete the clamping of the cable fixing block (2.1).

[0055] like Figure 8As shown, the slewing bracket (6) is composed of a plurality of bracket units (6.1) spliced ​​together, and each bracket unit (6.1) is a profile of the same specification. In fact, the slewing bracket (6) adopts a modular structure. The end of each bracket unit (6.1) close to the inner wall of the tower is connected to the slewing bearing (7), and the end of each unit close to the middle of the tower is spliced ​​with the adjacent bracket unit (6.1) to form a mutual support structure. This structure can be summarized as "middle connection, surrounding support". Fig. 9 As shown, the swivel bracket (6) is connected to the cable fixing plate (2), and specifically, the swivel bracket (6) is connected to the cable fixing block (2.1), while the swivel bracket (6) is not connected to the cable fixing block (2.2). Therefore, the thickness of the cable fixing block (2.2) is smaller than the thickness of the cable fixing block (2.1).

[0056] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top, bottom" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] In this utility model, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0058] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cable suspension and torsion device, characterized in that: It comprises a load-bearing cable (1) and a cable fixing plate (2); The load-bearing cable (1) is vertically arranged at the center of the wind turbine tower, and the upper end of the load-bearing cable (1) is fixedly connected to the base (5) of the wind turbine; The plurality of cable fixing discs (2) are respectively clamped and fixed on the load-bearing cable (1), and the cable fixing discs (2) clamp and fix the cables (3), and the cables (3) are distributed around the load-bearing cable (1); When the wind turbine is in an initial state without yaw, the cable (3) between the two cable fixing plates (2) is loose; A multi-layer maintenance platform (4) is arranged inside the wind turbine tower, and a through hole (4.1) is arranged in the middle of the maintenance platform (4) so ​​that the load-bearing cable (1) can pass through; the cable fixing plate (2) close to the maintenance platform (4) is fixedly connected to a slewing bracket (6), and the slewing bracket (6) rotates around the middle of the maintenance platform (4) through a slewing bearing (7).

2. A cable suspension and torsion device according to claim 1, characterized in that: The cable fixing disk (2) is composed of a cable fixing block (2.1) and a cable fixing block (2.2); the cable fixing block (2.2) surrounds the cable fixing block (2.1) in the middle.

3. A cable suspension and torsion device according to claim 2, characterized in that: The cable fixing block (2.1) adopts a segmented structure, and the cable fixing block (2.1) is composed of at least a pair of cable fixing sections connected by bolts (8).

4. A cable suspension and torsion device according to claim 2, characterized in that: The cable fixing block (2.2) adopts a segmented structure and is composed of a plurality of pairs of cable fixing sections connected by bolts (8).

5. A cable suspension and torsion device according to claim 4, characterized in that: The bolts (8) used to connect the multiple pairs of cable fixing sections also pass through the cable fixing block (2.1), so that the cable fixing block (2.2) is connected to the cable fixing block (2.1).

6. A cable suspension and torsion device according to claim 2, characterized in that: The swivel bracket (6) is composed of a plurality of bracket units (6.1) spliced ​​together, and each bracket unit (6.1) is a profile with the same specifications; the swivel bracket (6) is only connected to the cable fixing block (2.1) of the cable fixing disk (2).

7. A cable suspension and torsion device according to claim 6, characterized in that: One end of each bracket unit (6.1) is connected to the slewing bearing (7), and the other end of each unit is spliced ​​with an adjacent bracket unit (6.1) to form an inter-supporting structure.

8. A cable suspension and torsion device according to claim 1, characterized in that: The fixed ring of the slewing bearing (7) is connected to the middle of the maintenance platform (4), and the rotating ring of the slewing bearing (7) is connected to the slewing bracket (6).

9. A wind turbine generator set, characterized in that: A cable suspension and torsion device comprising any one of claims 1-8.

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