CN106257048A - Blade is provided with the vertical axis aerogenerator of horizontal bar - Google Patents

Abstract

The invention discloses a vertical axis wind power generator with transverse ribs on the blades, including a chassis, a generator, two pulling steel rods, a fixed beam, a main shaft and three blades, wherein: the three blades are along the The main shaft is evenly distributed in the circumferential direction and fixedly connected with the main shaft. The paddle is a curved surface and the radius of curvature gradually increases from bottom to top. A top plate and a bottom plate are respectively installed above and below the paddle. The top plate and the bottom plate are both sleeved on the main shaft. and fixedly connected with the main shaft; the two ends of the fixed beam are respectively fixedly connected with the top cover of the chassis through a pulling steel rod, the upper end of the main shaft is rotatably connected to the fixed beam, and the lower end passes through the top cover of the chassis and extends into the chassis , the generator is installed in the case and connected to the lower end of the main shaft; a plurality of through holes are processed on the top plate and the chassis. The wind power generator in the invention is easy to install, easy to start, and simple to involve.

Description

Vertical axis wind turbine with transverse ribs on the blades

technical field

The invention relates to the field of electric power equipment, in particular to a vertical axis wind power generator with transverse ribs on the blades.

Background technique

With the development of the new energy industry, people pay more and more attention to the utilization of wind energy. According to the rated power of wind turbines, they are generally divided into: microcomputer (below 10kW); small computer (10kW to 100kW); medium-sized computer (100kW to 1000kW) and large computer (above 1000kW, MW-level fan).

Wind turbines (hereinafter referred to as "fans") are mainly composed of two parts: the wind turbine part-converts wind energy into mechanical energy; the generator part-converts mechanical energy into electrical energy. The generator part of the fan can be an asynchronous generator or a synchronous generator.

Commonly used fans are horizontal-axis wind turbines, which have the following disadvantages: (1) large volume, high center of gravity, inconvenient installation, need to be fixed by drawing fibers, and easy to fall when encountering strong wind; The requirements are high, and it is difficult to start power generation in the breeze area; (3) It is necessary to install a windward device to ensure that the impeller of the wind turbine is always at the position of the maximum wind receiving surface, which adds difficulty to the design of a simple fan.

Contents of the invention

The technical problem to be solved by the present invention is to provide a wind power generator that is easy to install, easy to start, and simple in design.

Therefore, technical scheme of the present invention is as follows:

A vertical axis wind power generator with transverse ribs on the blades, including a chassis, a generator, two pulling steel rods, a fixed beam, a main shaft and three blades, wherein:

The three paddles are evenly distributed along the circumference of the main shaft and are fixedly connected to the main shaft. The paddles are a curved surface and the radius of curvature gradually increases from bottom to top. A a top plate and a bottom plate, both the top plate and the bottom plate are sleeved on the main shaft and fixedly connected with the main shaft;

The two ends of the fixed beam are fixedly connected to the top cover of the cabinet through a pulling steel rod, the upper end of the main shaft is rotatably connected to the fixed beam, and the lower end extends through the top cover of the cabinet. The generator is installed in the case and connected to the lower end of the main shaft; both the top plate and the chassis are processed with a plurality of through holes.

Further, the paddle is equipped with a plurality of horizontal ribs evenly arranged in the vertical direction, the two ends of the horizontal ribs respectively extend to the main shaft and the outer edge of the paddle, and the horizontal ribs form a preset angle with the horizontal plane And one end of the transverse rib on the main shaft is lower than its end on the outer edge of the blade, and the preset angle is 27-33°.

Further, a thrust bearing is respectively installed between the upper end of the main shaft and the fixed beam, and between the lower end of the main shaft and the top cover of the chassis.

The vertical axis wind power generator with transverse ribs on the blades of the present invention has the following advantages:

(1) Safety - the design of vertical blades and triangular double fulcrums is adopted, and the main force point is concentrated on the hub, so it can better solve the problems of blade falling off, breaking and blade flying out;

(2) Noise—horizontal axis wind turbines rotate on a vertical plane and the blades are designed using the principle of an aircraft wing, making them noisy during operation. The noise of the vertical axis wind turbine can be reduced to a level that cannot be measured in the natural environment;

(3) Wind resistance - the horizontal rotation of the vertical axis wind turbine and the triangular double fulcrum design principle make it less wind pressure, and can resist strong winds with a speed of less than 30m/s under the condition of a fixed and stable foundation;

(4) Radius of gyration - due to its different design structure and working principle, it has a smaller radius of gyration than other wind turbines, saving space and improving efficiency;

(5) Power generation curve characteristics - due to the operating characteristics of the vertical axis fan, its start-up wind speed is lower than other types of fans, and the rise of power generation is relatively gentle. Therefore, within the wind speed range of 5-8m/s, its power generation The output is 10% to 30% higher than other types of fans;

(6) Utilize the wind speed range - the vertical axis fan adopts a special control principle, which expands its suitable operating wind speed range to 2.5-25m/s, and obtains a larger total power generation while maximizing the use of wind resources , improving the economy of wind power equipment use;

(7) Brake device - the vertical axis fan can be equipped with mechanical manual and electronic automatic brakes. In areas without super gusts, only manual brakes need to be set;

(8) Operation and maintenance - there is no need to install a steering mechanism, and it is only necessary to regularly (usually every six months) check the connection of the chain transmission components.

Description of drawings

Fig. 1 is a schematic structural view of a vertical axis wind turbine with transverse ribs on the blades according to an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of the blade part of the vertical axis wind turbine with transverse ribs arranged on the blade in Fig. 1;

Fig. 3 is a schematic structural view of the groove on the paddle in Fig. 2 .

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

As shown in Figures 1 to 3, a vertical-axis wind turbine with transverse ribs on the blades according to an embodiment of the present invention includes a chassis 1, a generator 2, two pulling steel rods 3, a fixed beam 4, and a main shaft 5 and three blades 6, wherein:

The three paddles 6 are evenly distributed along the circumference of the main shaft 5 and are fixedly connected with the main shaft 5. The paddles 6 are a curved surface and the radius of curvature gradually increases from bottom to top. Above the paddles 6 A top plate 7 and a chassis 8 are respectively installed on the bottom and bottom, and the top plate 7 and the chassis 8 are both sleeved on the main shaft 5 and fixedly connected with the main shaft 5;

Both ends of the fixed beam 4 are fixedly connected to the top cover 9 of the cabinet 1 through a pulling steel rod 3, the upper end of the main shaft 5 is rotatably connected to the fixed beam 4, and the lower end passes through the The top cover 9 of the case 1 protrudes into the case 1 , and the generator 2 is installed in the case 1 and connected to the lower end of the main shaft 5 .

Further, a plurality of transverse ribs 10 evenly arranged in the vertical direction are installed on the blade 7, and the two ends of the transverse ribs 10 respectively extend to the outer edge of the main shaft 5 and the blade 7, and the transverse ribs 10 There is a predetermined angle with the horizontal plane and one end of the transverse rib 10 on the main shaft 5 is lower than its end on the outer edge of the blade 7 , the predetermined angle is 27-33°.

Further, a thrust bearing 11 is installed between the upper end of the main shaft 5 and the fixed beam 4 , and between the lower end of the main shaft 5 and the top cover 9 of the cabinet 1 .

Further, a plurality of through holes are processed on the top plate 7 and the bottom plate 8 .

in particular:

(1) The top cover 7 of the chassis 1 can be made of steel plate to ensure the support rigidity, and the impeller shaft hole is punched at the center of the circle and the bearing seat is welded; the box body is surrounded by steel plates and welded to the top cover 7; the front of the box body is centered with a single opening inspection The door is locked; the bottom of the box body is welded with a basic fixed flange and a stiffener plate; the upper end of the box body is made of steel plates with left and right symmetrical longitudinal welded reinforcement ear plates and steel pipes to install the impeller fixed frame.

(2) Gear sets are installed on the lower end of the main shaft 5 and the 2 shafts of the generator, and a chain link is used as a transmission device. The components of the fixed generator 2 are made of steel plates according to the selected generator specifications.

(3) The impeller is designed as three paddles 6 with a mutual difference of 120°. For the three paddles 6 designed in this way, there is at least one blade 6 in an excellent wind-receiving position for incoming wind from any direction, especially It is more beneficial for the start-up of the fan in the case of light wind. Each paddle 6 narrows obliquely from top to bottom and bends into a semicircular arc axially. The windage resistance of the concave portion of the blade 6 is greater than that of the convex portion, thereby generating a pressure difference to drive the impeller to rotate. In order to make the aerodynamic efficiency greater, the blade 6 is twisted so that the angle between the top chord and the bottom chord is 15°, and a certain amount of spiral upward airflow is generated during operation to reduce the impact on the bottom bearing due to the weight of the impeller. of friction.

(4) Since the impeller rotates in the wind, the negative pressure generated by the gas flow during the period forms a complex force on the top plate 7 and the bottom plate 8. Drilling holes in the top plate 7 and the bottom plate 8 can reduce the impact of this force on the stability of the impeller Impact.

(5) The surface of the paddle 6 is designed with transverse ribs 10 projecting from the main shaft 5 to the outer edge of the paddle 6 and forming an angle of about 60 degrees to the impeller axis (30 degrees to the horizontal ground). The setting of transverse rib 10 is conducive to improving the strength of blade 6 and the wind resistance on the surface of blade 6, and the airflow is directed to the edge of blade 6, the moment of action of the airflow is increased, and the utilization efficiency of wind energy is increased; A certain amount of helical lift force to reduce the friction force on the bottom bearing due to the self-weight of the impeller.

(6) The main shaft 5 and the frame are preferably connected by a thrust bearing 11 (thrust tapered roller bearing). The thrust tapered roller bearing is a tapered roller bearing. Its function makes the rotating shaft have good concentricity and pressure bearing effect, which is beneficial to the rotation balance of the impeller. As a result of the correction of the linear contact between the needle rollers and raceways, damaging edge stresses are avoided.

(7) Fix the main shaft through the thrust bearing 11 with a steel frame to prevent the upper part of the impeller from swinging left and right and moving up and down under force.

The properties of the material used for the blade 6 have a great influence on the performance and efficiency of the wind power generation device. It is recommended to use relatively cheap aluminum alloy for casting and compression molding, or use high-strength, high-quality, and light-weight carbon fiber reinforced plastics for injection molding.

Although the price of carbon fiber reinforced plastic is relatively high, if this material is used, its strength, high quality and light weight make the blades of wind turbines be designed with unequal wall thickness according to their force characteristics, and the blades can be reduced while ensuring the strength and stiffness. Leaf thickness, and easy to shape. Calculations show that, using the above materials, as long as the thickness of the blade is 1.2mm, the strength required by the design can be met. At the same time, due to the light weight, it is beneficial to start under the condition of breeze.

The vertical axis wind power generator with horizontal ribs on the blades of the present invention is easy to manufacture, can operate normally at wind speeds of 3 to 4, can be installed on the roof of a building or on the ground, and is easy to maintain, and is more suitable as a small household. With wind turbines. Combined with a small-capacity grid-connected inverter, it can meet the requirements of grid-connected power generation.

The structure of three blades 6 is adopted, which is balanced and beautiful. The number of blades 6 is determined by many factors, including aerodynamic efficiency, complexity, cost, noise, aesthetic requirements and so on. Vertical-axis wind turbines with too few blades provided with transverse ribs generally require a relatively high rotational speed to obtain sufficient wind energy, and therefore are noisy. With too many blades, they will interact and reduce system efficiency.

The shape of the blade 6 has been optimized, which is mainly reflected in the blade structure with a wide top and a narrow bottom and the lower end of the blade is twisted forward, and the surface of the blade is equipped with transverse ribs 10, which can increase the wind resistance of the blade surface to solve the problem of low fan efficiency caused by low speed The problem.

The vertical axis wind power generator with transverse ribs on the vertical axis blades of the present invention has the following advantages:

(1) Safety - the design of vertical blades and triangular double fulcrums is adopted, and the main force point is concentrated on the hub, so it can better solve the problems of blade falling off, breaking and blade flying out;

(2) Noise—horizontal axis wind turbines rotate on a vertical plane and the blades are designed using the principle of an aircraft wing, making them noisy during operation. The noise of the vertical axis wind turbine can be reduced to a level that cannot be measured in the natural environment;

(3) Wind resistance - the horizontal rotation of the vertical axis wind turbine and the triangular double fulcrum design principle make it less wind pressure, and can resist strong winds with a speed of less than 30m/s under the condition of a fixed and stable foundation;

(4) Radius of gyration - due to its different design structure and working principle, it has a smaller radius of gyration than other wind turbines, saving space and improving efficiency;

(5) Power generation curve characteristics - due to the operating characteristics of the vertical axis fan, its start-up wind speed is lower than other types of fans, and the rise of power generation is relatively gentle. Therefore, within the wind speed range of 5-8m/s, its power generation The output is 10% to 30% higher than other types of fans;

(6) Utilize the wind speed range - the vertical axis fan adopts a special control principle, which expands its suitable operating wind speed range to 2.5-25m/s, and obtains a larger total power generation while maximizing the use of wind resources , improving the economy of wind power equipment use;

(7) Brake device - the vertical axis fan can be equipped with mechanical manual and electronic automatic brakes. In areas without super gusts, only manual brakes need to be set;

(8) Operation and maintenance - there is no need to install a steering mechanism, and it is only necessary to regularly (usually every six months) check the connection of the chain transmission components.

In summary, the content of the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical guidance of the present invention, but such embodiments are all included in the present invention. within the range.

Claims (2)

1. a vertical axis wind-driven generator with transverse ribs on the blade is provided with transverse ribs, it is characterized in that it comprises a chassis (1), a generator (2), two pulling steel rods (3 ), fixed beam (4), main shaft (5) and three paddles (6), wherein: The three paddles (6) are evenly distributed along the circumference of the main shaft (5) and fixedly connected with the main shaft (5). The paddle (6) is a curved surface and the radius of curvature gradually increases from bottom to top , a top plate (7) and a chassis (8) are respectively installed above and below the paddle (6), and the top plate (7) and the chassis (8) are both sleeved on the main shaft (5 ) and fixedly connected with the main shaft (5); The two ends of the fixed beam (4) are fixedly connected to the top cover (9) of the cabinet (1) through a pulling steel rod (3) respectively, and the upper end of the main shaft (5) is rotatably connected to The lower end of the fixed beam (4) passes through the top cover (9) of the cabinet (1) and extends into the cabinet (1), and the generator (2) is installed in the cabinet (1) and connected to the lower end of the main shaft (5); A plurality of transverse ribs (10) evenly arranged in the vertical direction are installed on the blade (7), and the two ends of the transverse ribs (10) respectively extend to the main shaft (5) and the blade (7) The outer edge of the horizontal rib (10) is at a predetermined angle with the horizontal plane and the end of the transverse rib (10) on the main shaft (5) is lower than its end on the outer edge of the blade (7), so The above preset angle is 27-33°. 2. The vertical axis wind power generator with transverse ribs on the blades according to claim 1, characterized in that, between the upper end of the main shaft (5) and the fixed beam (4), the main shaft (5) A thrust bearing (11) is respectively installed between the lower end of ) and the top cover (9) of the cabinet (1).