CN102536683A - Zonal guy cable device used for enhancing blade stability of large-scale wind driven generator - Google Patents

Abstract

The latitudinal cable device used to enhance the stability of large wind turbine blades consists of blades, fan hubs, fan main shafts, latitudinal cable systems and cable tension adjustment systems. The tension is transmitted to the front end of the fan by the cable and the steering bracket, and the tension is adjusted and controlled by the cable tension adjustment system, so that the blade has high rigidity along the rotation circumference, which greatly improves the vibration resistance and wind load resistance of the blade capacity, especially suitable for large blade systems with more than 3 blades. The weft cable device provided by the present invention will enable the large-scale wind power generator to adopt lighter and super-long blades to have better stability, and has the characteristics of on-site construction, convenient maintenance, controllable stress state and high safety. It is especially suitable for the design and construction of large and super large blades.

Description

Latitudinal stay cable device for enhancing the stability of large wind turbine blades

technical field

The invention relates to a modular large-scale wind power generator blade structure capable of charging and pumping air, and belongs to the field of wind power generation equipment.

Background technique

Most of today's energy sources are fossil fuels: coal, oil, and natural gas. At current rates of use, the remaining known coal deposits will be used up in about 200 years, while oil and gas will be used up in less than 100 years. do. Fossil fuels cause a lot of environmental pollution when used, including greenhouse gases that contribute to global warming. Wind energy is one of the most commercially viable and dynamic renewable energy sources. It is clean, low-cost, and inexhaustible. Wind power has the advantages of large growth space for installed capacity, rapid cost reduction, safety, and energy never being exhausted. Wind power can effectively alleviate air pollution, water pollution and global warming while providing a stable power supply for economic growth. Among all kinds of new energy development, wind power generation is a power generation method with relatively mature technology and conditions for large-scale development and commercial development. Wind power generation can reduce a large amount of pollutants and carbon emissions generated by fossil fuel power generation. Large-scale promotion of wind power generation can Make positive contributions to energy saving and emission reduction. Against the background of the global energy crisis and the increasingly severe environmental crisis, wind energy resources have begun to receive widespread attention. The large-scale development of wind power generation provides a broad market space and prospects for the wind power equipment manufacturing industry. It is estimated that the global potential wind power generation capacity exceeds 70 trillion kilowatts, which is 10 times larger than the total amount of water energy that can be developed and utilized on the earth. As the cost of conventional energy continues to rise in the future, the advantages of wind power will become more obvious and the development will be faster. It is estimated that the average annual growth rate of wind power installed capacity will be as high as 20% in the next few years. According to the report of the Global Wind Energy Council, countries such as Germany, Spain, the United States, India, Denmark, Italy, the United Kingdom, the Netherlands, China, Japan and Portugal currently have relatively large installed wind power capacity. The Global Industry Blue Book released by Greenpeace International and the World Wind Energy Association believes that by 2020, the world's installed wind energy capacity will reach 1.26 billion kilowatts, and by then wind power will reach 3.1 trillion kilowatt-hours, and wind power will account for 12% of the world's electricity supply (at the same time , this clean energy will reduce about 11 billion tons of carbon dioxide emissions).

It can be seen that the use of renewable energy, including solar energy, wind energy, and biomass energy, has entered a new period of development. Wind energy is considered to be the most promising clean energy that can compete with traditional energy in terms of power generation costs. The average unit power of wind turbines in the UK, Denmark and other European countries has reached 2.5 MW, and the average in China is 1.6 MW. The installation cost of offshore wind turbines is relatively high, so large-scale units have more cost advantages. Denmark’s Vestas’ 6MW wind turbine is about to be put into use, and American Clipper Company has developed a 10MW prototype. The next generation of offshore wind power megawatt-level units will reach 6MW to 10MW.

In recent years, China's wind power industry has shown explosive growth. From the annual installed capacity of less than 1000MW in 2005 to more than 14000MW in 2009, the annual installed capacity has increased by 14 times in five years. During the "Twelfth Five-Year Plan" period (2011-2015) China's new wind power installed capacity will reach 40,000MW, and China has become a world-renowned wind power country.

From the end of the 19th century to the beginning of the 20th century, wind power generation was all small-scale direct current power generation. It was not until the first half of the 20th century that wind power generators began to be enlarged, and the output power was increased by improving aerodynamic performance. By the late 1990s, 1MW-1.5MW wind turbines had been adopted on a large scale. In the 21st century, the power of wind turbines and the diameter of wind rotors tend to be larger. Wind turbines with a rotor diameter of 60-80m and an output power of 2MW are the dominant units. At the same time, offshore wind turbines are also becoming larger.

Today, the latest technology and development trend of wind power generation show the development trend of large-scale, variable speed operation, variable pitch and no gearbox, that is,

1. In terms of large scale, megawatt-level wind turbines have commercial value now, and their single-unit capacity can reach 2-3MW. At present, the largest offshore wind turbine has a single-unit capacity of up to 5MW, and the length of the wind turbine blades is also greater than 30m. , The weight of the generator set is also relatively heavy, which will inevitably bring greater difficulties in transportation and installation, and the structural safety of the wind turbine set will also face greater risks when the wind is strong.

2. In terms of variable speed operation, that is, compared with constant speed wind turbines, variable speed wind turbines have the advantages of large power generation, good adaptability to wind speed changes, low production costs, and high efficiency. However, for large wind turbines, due to The blades are longer and heavier, and the control of their inertia will be a difficult point.

3. In terms of design and operation of variable pitch, fixed pitch is currently developing towards variable pitch. The advantages of variable pitch adjustment are good starting performance of the unit, stable output power, small force on the unit structure, and convenient and safe shutdown. The pitch changing mechanism is more complicated, which also increases the failure probability of the pitch changing device, and the control program is more complicated. Combined with the application of variable pitch technology and the development of power electronics technology, most wind turbine developers and manufacturers began to use variable speed and constant frequency technology, and developed variable pitch and variable speed wind turbines, which further improved and improved the wind energy conversion.

4. In terms of no gearbox (direct drive), that is, the use of direct drive without a gearbox can effectively improve the efficiency and operational reliability of the system, but it is necessary to develop low-speed generator technology.

5. In terms of blade technology, the airfoil of wind turbine blades has developed from the airfoil of an airplane wing to the airfoil specially used for wind turbines recently, and has obtained higher airfoils in the low Reynolds number range. Compared with the airfoil used by aircraft, the airfoil is thicker, and the strength and rigidity of the blade are also greatly improved.

As far as blades are concerned, today’s large-scale wind power generation equipment has the following deficiencies: the size of large blades is getting longer and longer, which puts forward higher and higher requirements for the weight, strength and stiffness of blade materials; although large blades can improve wind energy Utilization, because only one end of the blade is fixed on the hub of the fan, which is a typical cantilever structure. In the direction of rotation of the blade, its stiffness is relatively weak, which will inevitably bring severe vibration caused by wind load. Similarly, the blade also bears Larger loads along the wind direction will bring safety hazards under the action of extremely large winds. In short, the overall structure of larger blades has poor stability in the circumferential direction and along the wind direction. Significantly improving the overall stability of the blade structure is a key issue in the development of large and super-large blade structures today.

Contents of the invention

The purpose of the present invention is to propose a latitudinal cable device for enhancing the stability of large-scale wind turbine blades. The latitudinal cable system is mainly used to improve the stiffness of the blade along the rotation circumference and wind direction, which can greatly improve the blade’s stiffness. Anti-vibration and anti-wind load capacity, especially suitable for large-scale blade systems with more than 3 pieces.

Technical scheme of the present invention is as follows:

A latitudinal cable device for enhancing the stability of blades of large-scale wind-driven generators. The large-scale wind-driven generators contain more than three blades, fan hubs, and fan main shafts. The blades are connected to the fan hubs, and the fan hubs are installed on On the main shaft of the fan, it is characterized in that: the weft cable device includes a weft cable system, a cable tension adjustment system and a first connection device arranged on each blade; the weft cable system includes a weft To the first layer of the cable and the connecting plate of the cable in the warp direction; the cable tension adjustment system includes a weft tension screw regulator, an automatic controller, and a front tension bearing force shaft fixed on the main shaft of the fan, which is automatically controlled The device is connected to the weft tension screw regulator through the control line; the first latitude cable connects the middle part of the first connecting device on each blade in turn; The midpoint of the layer cable is connected, and connected to the connecting plate of the warp cable after being steered by the fixed pulley on the cable steering bracket. The bearing is connected with the connection plate of the warp cable.

The technical feature of the present invention is that: the weft cable device also includes a second connecting device and a second latitudinal cable, and the second latitudinal cable connects the middle part of the second connecting device on each blade in turn. Connection: The meridional force transmission cable connects the midpoints of the first and second latitudinal cables between each two blades, and connects with the meridional cable connection plate after turning through the fixed pulley on the cable steering bracket connected.

Compared with the existing technology, the present invention has the following characteristics and outstanding effects for the large-scale blade wind power generator system with more than 3 pieces: ①The circumference of the blade can be greatly improved by one or more layers of latitudinal cable system; ② can maintain the integrity and reliability of the entire blade system, and provide a new cable reinforcement method for the safe operation of large or super large blades.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of a one-layer weft cable device provided by the present invention.

FIG. 2 is a rear view of the cable device of FIG. 1 .

Fig. 3 is a schematic diagram of an embodiment of a double-layer weft cable device provided by the present invention.

FIG. 4 is a rear view of the cable device of FIG. 3 .

In the figure: 1-blade; 2-fan hub; 3-fan main shaft; 6-latitude first layer cable; 7-latitude second layer cable; 8-longitude force transmission cable; 9-stay cable Steering bracket; 10-front tension bearing shaft; 11-first connecting device; 12-second connecting device; 15-warp cable connection plate; 16-weft tension screw regulator; 18-weft tension The direction of movement of the screw regulator; 19-automatic controller.

Detailed ways

Below in conjunction with accompanying drawing, structure of the present invention and specific embodiment are described further:

Fig. 1 and Fig. 2 are the structural schematic diagram of the embodiment of one layer latitudinal cable device provided by the present invention, described large-scale wind generator contains more than three blades 1, fan hub 2 and fan main shaft 3, described blade 1 and fan main shaft 3 The fan hub 2 is connected, and the fan hub 2 is installed on the fan main shaft 3; the weft cable device includes a weft cable system, a cable tension adjustment system and a first connection device 11 arranged on each blade; the weft The cable system contains one layer of cables, the first layer of cables 6 in the weft direction connects the middle part of the first connecting device 11 on each blade in turn, and the force transmission cable 8 connects the weft direction between each two blades. The midpoints of the cables are connected, and are connected with the warp cable connection plate 15 after being turned by the fixed pulley on the cable steering bracket 9; And the front tension bearing shaft 10 fixed on the fan main shaft 3, the inside of the weft tension screw regulator 16 is connected with the front tension bearing shaft 10 through threads, and the outside is connected with the warp cable connection plate 15 by bearings , the automatic controller 19 is connected with the weft tension screw adjuster 16 by a control line.

Fig. 3 and Fig. 4 are the structural schematic diagrams of the embodiment of the double-layer weft cable device provided by the present invention, including the weft cable system, the cable tension adjustment system, and the first connecting device 11 and the first connecting device 11 arranged on each blade. A connection device 12; the weft cable system contains double-layer cables, the first latitude cable 6 sequentially connects the middle part of the first connection device 11 on each blade, and the weft second layer cable 7 The middle part of the second connection device 12 on each blade is connected successively, and the midpoint of the first layer and the second layer of latitudinal cables between every two blades is connected by the meridional force transmission cable 8, and is passed through the cable The fixed pulley on the steering bracket 9 is connected to the meridional cable connecting plate 15 after being turned; Bearing shaft 10, the inside of latitudinal tension screw adjuster 16 is connected with front tension bearing shaft 10 by thread, and the outside adopts bearing to connect with meridional cable connection plate 15, and automatic controller 19 is connected with weft direction by control line. The tension screw adjuster 16 is connected.

The installation and debugging instructions of the cable device are given below with the embodiment of the double-layer latitude cable device shown in FIG. 3 . In the installation stage, first, according to the design requirements, the first connecting device 11 and the second connecting device 12 are installed on the blade, and the meridional cable connecting plate 15 is fixed on the fan main shaft 3 through the bearing and the weft tension screw adjuster 16. connected to the front tension bearing shaft 10 on the top, and the automatic controller 19 is installed in the fan hub 2. Cable tension adjustment system. Then, the weft cable system is installed, and the middle part of the first connecting device 11 on each blade is connected successively to form the first layer of latitude cables 6, and in the same way, the second layer of latitude cables is completed. Use meridional force transmission cable 8 to connect the midpoints of the first layer and the second latitudinal cable between every two blades, and connect with the warp cable after steering through the fixed pulley on the cable steering bracket 9 Disk 15 is connected.

After completing the installation of the cable, the preset and debugging of the cable tension can be carried out through the rotation of the weft tension screw adjuster 16 on the front tension bearing shaft 10, and controlled by the automatic controller 19, and then The bearing installed in the middle drives the connecting plate 15 of the warp cable to move along the moving direction 18 of the weft tension screw adjuster. The more, the greater the degree of tension; at this time, the weft cable system will form a compression tension balance force system for the blade in the rotating plane of the blade, so that the blade system of the fan has better integrity and stability.

During the operation of the fan, there will be tension relaxation. At this time, after the tension sensor senses, the weft tension screw regulator 16 can be rotated on the front tension bearing force shaft 10 to adjust the weft tension. The tension of the cable system; so that the tension of the blades in the rotating plane reaches a reasonable set value, and all the adjustment processes can be controlled by the automatic controller 19 installed in the hub of the fan and automatically completed.

Claims (2)

1. be used to strengthen the broadwise cable arrangement of blades of large-scale wind driven generator stability; Said large-scale wind driven generator contains blade (1), axial fan hub (2) and the blower fan main shaft (3) more than three; Said blade (1) is connected with axial fan hub (2); Axial fan hub (2) is installed on the blower fan main shaft (3), it is characterized in that: said cable arrangement comprises broadwise cable systems, drag-line tension regulating system and is arranged on first connection set (11) on each blade; Described broadwise cable systems comprises broadwise first layer drag-line (6) and warp-wise drag-line land (15); Described drag-line tension regulating system contains weft tension screw regulator (16), automatic controller (19) and is fixed on the preposition stretch-draw load axle (10) on the blower fan main shaft (3), and automatic controller (19) is connected with weft tension screw regulator (16) through guide line;

Broadwise first layer drag-line (6) connects the middle part of first connection set (11) on each blade successively; Warp-wise power transmission drag-line (8) links to each other the mid point of first layer drag-line between per two blades; And through the static pulley on the drag-line turning rack (9) turn to the back link to each other with warp-wise drag-line land (15); The inside of weft tension screw regulator (16) is connected with preposition stretch-draw load axle (10) through screw thread, and the outside bearing that adopts is connected with warp-wise drag-line land (15).

2. according to the described broadwise cable arrangement that is used to strengthen blades of large-scale wind driven generator stability of claim 1; It is characterized in that: said broadwise cable arrangement also comprises second connection set (12) and broadwise second layer drag-line (7), and broadwise second layer drag-line (7) connects the middle part of second connection set (12) on each blade successively; Warp-wise power transmission drag-line (8) links to each other the mid point of first layer and second layer broadwise drag-line between per two blades, and turns to the back to link to each other with warp-wise drag-line land (15) through the static pulley on the drag-line turning rack (9).

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