Anti-twisting device for variable pitch cable of fan blade
By designing a split telescopic spring and buffer protective sleeve combination structure in the wind power generation system, the problems of cable winding twist, wear and break when the blade pitch are changed, and effective cable protection and efficient system operation are achieved.
Patent Information
- Application Number
- CN202421585312.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In existing wind power systems, cables are prone to twist, wear and break when the blades are pitched, and the design of the reserved cables affects the aesthetics and interferes with system maintenance.
A split fan blade pitch cable anti-torsion device is designed, and a combination of a telescopic spring and a buffer protective sleeve is adopted. Through the free expansion and slight torsion of the telescopic spring, dynamic stress is absorbed and the buffer protective sleeve is reduced.
It effectively reduces the risk of wear and breakage caused by excessive twisting or fatigue of cables, reduces downtime and replacement costs, and improves the operational efficiency and economic benefits of wind farms.
Smart Images
Figure CN222775902U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wind power generation, and in particular relates to an anti-twisting device for variable pitch cables of wind turbine blades. Background Art
[0002] At present, in the field of wind power generation, in order to prevent the blade pitch cables from twisting and wearing, the method of pre-reserved cables is mainly used; however, there are many uncertain factors in blade pitch change, and the working conditions are complex. For example, during normal pitch change, the blades rotate between 0-89 degrees. During abnormal conditions, the pitch angle range becomes larger, even reaching 360 degrees. At the same time, the pitch speed is high, and the speed varies according to different control strategies. When the pitch system is operated and maintained, it involves blade rotation and bolt torque maintenance. The method of pre-reserved cables may cause cable wear, excessive twisting and breaking during abnormal pitch change, and the reserved cables may affect the appearance and interfere with the operation and maintenance of the pitch system. Utility Model Content
[0003] The utility model aims to provide an anti-twisting device for wind turbine blade pitch cables, which solves the technical problems of cable winding, twisting, deformation, wear and breakage during pitch change in existing pitch systems.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] A device for preventing twisting of a pitch cable of a wind turbine blade comprises a bottom bracket and a top bracket, wherein a telescopic spring is connected between the middle of the top bracket and the middle of the bottom bracket, and a plurality of mounting holes are evenly distributed on the bottom bracket and the top bracket.
[0006] Furthermore, a threaded sleeve is fixed in the middle of the top bracket, the threaded sleeve has an internal thread, a stud is connected to the internal thread of the threaded sleeve, an upper hanging plate is fixed to the end of the stud, and a lower hanging plate is fixed in the middle of the bottom plate bracket. Hanging holes are opened on the upper hanging plate and the lower hanging plate, and the two ends of the telescopic spring are hung in the hanging holes of the upper hanging plate and the lower hanging plate.
[0007] Furthermore, a plurality of buffer protective sleeves are arranged on the telescopic spring, and the buffer protective sleeves are composed of a first clamping sleeve and a second clamping sleeve, the first clamping sleeve and the second clamping sleeve are connected to each other, and the cross-sections of the first clamping sleeve and the second clamping sleeve are both major arc shapes, the first clamping sleeve can be clamped on the telescopic spring, and the second clamping sleeve can be clamped on the cable.
[0008] Furthermore, the inner walls of the first ferrule and the second ferrule are both provided with a polyurethane layer.
[0009] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts a split design, which is easy to install and maintain, especially the bottom bracket is installed on the manhole cover at the root of the blade, which does not interfere with the original structure, ensuring the convenience of installation and compatibility with the existing system; the top bracket is directly fixed to the bottom of the pitch control cabinet, and also does not take up extra space, which is conducive to regular inspection and maintenance by maintenance personnel; the design of the telescopic spring enables the cable to freely expand and contract and slightly twist when the blade pitches, effectively absorbing the dynamic stress caused by the rotation of the blades, and significantly reducing the risk of wear and breakage of the cable due to excessive twisting or fatigue; the utility model fits closely to the layout of the blades and the control cabinet, minimizing the occupation of the valuable space at the root of the blades, which provides more convenience for maintenance personnel to perform other operations (such as bolt torque inspection), while also ensuring the overall beauty and neatness of the pitch system; in short, the utility model preventively solves the problem of cable wear, reduces the downtime and replacement costs caused by cable failures, and helps to improve the overall operating efficiency and economic benefits of the wind farm. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0011] Figure 1 This is an axonometric diagram of an anti-twisting device for a pitch cable of a wind turbine blade according to the utility model;
[0012] Figure 2 This is a front view of an anti-twisting device for a pitch cable of a wind turbine blade according to the utility model;
[0013] Figure 3 This is a schematic diagram of the installation of the telescopic spring;
[0014] Figure 4 It is a schematic diagram of the structure of the buffer protective cover. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] The present invention is further described in detail below in conjunction with the embodiments.
[0017] A specific embodiment of a wind turbine blade pitch cable anti-twisting device provided by the utility model:
[0018] like Figure 1 and Figure 2 As shown, a device for preventing twisting of wind turbine blade pitch cables comprises a bottom bracket 1 and a top bracket 2, a telescopic spring 3 is connected between the middle of the top bracket 2 and the middle of the bottom bracket 1, and a plurality of mounting holes 4 are evenly distributed on the bottom bracket 1 and the top bracket 2.
[0019] When the anti-twisting device of this embodiment is in use, the bottom bracket 1 is fixed to the root cover plate of the wind turbine blade by bolts, the top bracket 2 is fixed to the bottom of the pitch control cabinet, the telescopic spring 3 is connected between the top bracket 2 and the bottom plate bracket, and then the cable coming out of the blade passes through the bottom bracket 1, is wound along the telescopic spring 3, and finally extends into the control cabinet through the top bracket 2; during the pitch change process, the bottom bracket 1 rotates with the blade pitch change, and the top bracket 2 is fixed to the control cabinet and does not move, and the cable is wound or released following the telescopic spring 3 in the middle, so that the cable is severely twisted and deformed.
[0020] In addition, since the optimal tension required under different working conditions, an adjustable tension control system can also be designed to adjust the tension of the telescopic spring 3 according to the pitch angle, speed and current state of the cable, which can protect the cable more accurately and reduce unnecessary stress accumulation; for example, Figure 3 As shown, a threaded sleeve 5 is fixed in the middle of the top bracket 2, and the threaded sleeve 5 has an internal thread. A stud 6 is connected to the internal thread of the threaded sleeve 5, and an upper hanging plate 7 is fixed to the end of the stud 6. A lower hanging plate 8 is fixed to the middle of the bottom plate bracket. Hanging holes are opened on the upper hanging plate 7 and the lower hanging plate 8, and the two ends of the telescopic spring 3 are hung in the hanging holes of the upper hanging plate 7 and the lower hanging plate 8; by rotating the stud 6 in the threaded sleeve 5, the length of the telescopic spring 3 is changed, and the tension of the telescopic spring 3 can be adjusted.
[0021] Secondly, although the telescopic spring 3 in this embodiment can reduce the twisting of the cable, there will be wear between the cable and the telescopic spring 3. Therefore, a plurality of buffer protective sleeves can be provided on the telescopic spring 3. When the cable is wound on the telescopic spring 3, it can be installed through the buffer protective sleeve. Specifically, Figure 4As shown, the buffer protection sleeve is composed of a first ferrule 9 and a second ferrule 10, which are connected to each other. The cross-sections of the first ferrule 9 and the second ferrule 10 are both superior arc-shaped. The first ferrule 9 can be clamped on the telescopic spring 3, and the second ferrule 10 can be clamped on the cable. The inner walls of the first ferrule 9 and the second ferrule 10 are both provided with a polyurethane layer 11. The polyurethane layer 11 has both the high strength of plastic and the high elasticity of rubber, and has excellent self-lubrication and vibration resistance, which ensures the low friction of the first ferrule 9 in contact with the telescopic spring 3, so that the first ferrule 9 can have a certain sliding property on the telescopic spring 3. Secondly, the buffering property of the contact between the second ferrule 10 and the cable plays a shock-absorbing effect, protecting the cable from damage by instantaneous tension or compression force.
[0022] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.
[0023] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A device for preventing twisting of wind turbine blade pitch cables, characterized in that: It comprises a bottom bracket and a top bracket, a telescopic spring is connected between the middle part of the top bracket and the middle part of the bottom bracket, and a plurality of mounting holes are evenly distributed on the bottom bracket and the top bracket.
2. The anti-twisting device for wind turbine blade pitch cable according to claim 1, characterized in that: A threaded sleeve is fixed in the middle of the top bracket, the threaded sleeve has an internal thread, a stud is connected to the internal thread of the threaded sleeve, an upper hanging plate is fixed to the end of the stud, a lower hanging plate is fixed in the middle of the bottom plate bracket, hanging holes are opened on the upper hanging plate and the lower hanging plate, and the two ends of the telescopic spring are hung in the hanging holes of the upper hanging plate and the lower hanging plate.
3. The anti-twisting device for wind turbine blade pitch cable according to claim 1, characterized in that: The telescopic spring is provided with a plurality of buffer protection sleeves, which are composed of a first clamping sleeve and a second clamping sleeve. The first clamping sleeve and the second clamping sleeve are connected to each other. The cross-sections of the first clamping sleeve and the second clamping sleeve are both major arc shapes. The first clamping sleeve can be clamped on the telescopic spring, and the second clamping sleeve can be clamped on the cable.
4. The anti-twisting device for wind turbine blade pitch cable according to claim 3 is characterized in that: The inner walls of the first ferrule and the second ferrule are both provided with a polyurethane layer.