CN209855961U - A pitch-adjusting mechanism for a vertical-axis wind turbine - Google Patents

Abstract

The utility model provides a pitch adjustment mechanism of a vertical axis wind power generator, which relates to the technical field of wind power generation. The inner side of the blade is provided with a connecting plate group arranged horizontally. The connecting plate group is located on both sides of the longitudinal centerline of the blade and arranged in pairs. The connecting plate on the left is hinged to the front end of the connecting rod, and the tail end of the connecting rod is connected to the belt The side ears of the centrifugal slider with a sleeve structure are hinged, and the sleeve of the centrifugal slider is in clearance fit with the support shaft; the connecting plate on the right is hinged with one end of the hinge plate through a rivet, and the other end of the hinge plate is provided with A connection block, the front end of the connection block and the support shaft is fixed by a set screw; a spring is arranged on the periphery of the support shaft between the connection block and the centrifugal slider, and the two ends of the spring are respectively connected to the inside of the connection block and the centrifugal slider. contact; the tail end of the support shaft is fixed with the fixing ring on the main shaft, and the lower end of the main shaft is fixedly connected with the output shaft of the generator through a coupling.

Description

A pitch-adjusting mechanism for a vertical-axis wind turbine

technical field

The utility model relates to the technical field of wind power generation.

Background technique

Wind energy is a clean and pollution-free renewable huge energy source in the world today. The total resource reserves are huge and the distribution is very wide. The wind turbines used to generate electricity can be divided into horizontal axis fans and vertical axis fans. The energy drive chain is vertical. , called a vertical axis fan. Among them, the vertical axis wind turbine is not affected by the wind direction compared with the horizontal axis wind turbine, so it is suitable for small generators. There are two main types of existing vertical axis fan blades: one is to use aerodynamic resistance to do work, such as S-shaped blades. This type of airfoil has a low utilization rate of wind energy, but its start-up wind speed is small, and it can be started in a breeze of 3m/s, which is suitable for generating power in a breeze, but it is difficult to accelerate at high wind speeds, which limits its power generation; Another kind is to utilize air to act on the lift force of airfoil. This airfoil is relatively stable when it has been started and driven by high-speed wind to rotate, and its wind energy utilization rate is higher than that of the drag type, but it has the disadvantage of not being able to start automatically. For vertical-axis wind turbines, this paper proposes a mechanism for adjusting the pitch, so that the vertical-axis blades can be in the state of resistance blades in order to obtain a lower start-up wind speed at low speeds or when they stop rotating. Higher maximum speed and presents the state of lift-type blades. It has the advantages of low starting speed and high utilization rate of wind energy. The power generation of such a wind turbine is far greater than that of a vertical axis wind turbine using drag blades or lift blades alone. make it more applicable.

In the existing pitch adjustment mechanism, people have proposed many designs. For example, the patent No. 201620969409.9 is a vertical-axis variable-wing wind power generator. The mechanism adjusts the pitch through the eccentric wheel. During the pitch change process, the resistance type and the lift type blade are combined to rotate, and the advantages of each type of blade cannot be used alone; another example Patent No. 201510328859.X is a variable wing vertical axis drag wind turbine. The mechanism lacks a reset module, and the rise-resistance change is not good.

Therefore, it is necessary to design an adjustable pitch mechanism with simple structure and reliable pitch adjustment process. Make it take full advantage of the advantages of low starting speed and high utilization rate of wind energy to increase power generation.

Utility model content

The purpose of the utility model is to provide a pitch adjustment mechanism of a vertical axis wind power generator, which can effectively solve the technical problem of the resistance type or lift type blades being in the same body.

The purpose of this utility model is achieved through the following technical solutions: a vertical axis wind power generator pitch adjustment mechanism, including blades and a tripod, the inner side of the blade is provided with a horizontally arranged connecting plate group, the connecting plate group is located The two sides of the longitudinal center line of the blade are arranged in pairs, the connecting plate on the left is hinged with the front end of the connecting rod, and the tail end of the connecting rod is hinged with the side ears of the centrifugal slider with side ears and a sleeve structure. The sleeve and the supporting shaft have a clearance fit; the connecting plate on the right is hinged with one end of the hinged plate through a rivet, and the other end of the hinged plate is provided with a connecting block, and the connecting block and the front end of the supporting shaft are fixed by set screws; A spring is arranged on the periphery of the supporting shaft between the connecting block and the centrifugal slider, and the two ends of the spring are respectively in contact with the inner side of the connecting block and the centrifugal sliding block; The output shaft of the generator is fixed through a coupling, and the generator is fixed on the ground; at the same time, the top of the tripod is a disc structure with embedded bearings, and the inner ring of the bearing is interference fit with the main shaft; the cover plate and the top surface of the tripod pass through The screw is fixed.

The supporting shaft inside the centrifugal slider is provided with a cassette.

There are three groups of connecting plate groups, which are evenly distributed with the upper, middle and lower points on the inner side of the blade.

The included angle between the blades is 120°.

The blades are NACA97 type blades, which can be drag-type "S"-shaped blades or lift-type blades.

Working process and principle of the present utility model are:

Pitch change process: a power generation mechanism based on wind-solar complementary, a total of three sets of blades, each blade and related parts have the same principle. When starting, the spring is the original length, and the blade is a resistance blade; when the wind speed increases, the speed of the blade increases accordingly, and the centrifugal slider will perform centrifugal motion, the centrifugal force is greater than the elastic force of the spring, and the centrifugal slider moves away along the support axis Moving in the direction of the main shaft, the spring is compressed to drive the connecting rod connected with the centrifugal slider, and the blade is pushed to rotate relatively around the connecting plate, gradually turning into a lift type blade. At higher wind speeds, the blades are lift-type blades. At the same time, due to the limiting effect of the cassette, the movement of the centrifugal slider is limited, and it will not slide past the specified position due to excessive wind speed. When the wind speed drops, the rotation speed decreases, the centrifugal force on the centrifugal slider is weakened, which is less than the spring force between the centrifugal slider and the connecting block, the spring recovers from the compressed state, and pushes the centrifugal slider to move along the supporting shaft to the direction close to the main shaft, driving the The connecting rod connected by the centrifugal slider pulls the blade to make it rotate relatively around the connecting plate, and gradually turns into a resistance type blade.

Advantages and effects compared with prior art:

The utility model makes good use of the centrifugal effect of the blades, combines the advantages of the two typical blades of the vertical axis wind power generator, and abandons the shortcomings of the two. Long, the blades are in the state of resistance blades, when the wind speed is high, the slider is subjected to centrifugal action, the spring is compressed, and the blades are in the state of lift blades. The utilization rate of wind energy is improved.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model;

Fig. 2 is a structural schematic diagram when the blade of the utility model is a lift type;

Fig. 3 is a structural schematic diagram when the blade of the utility model is a resistance type;

Fig. 4 is a partial enlarged schematic diagram of the tripod of the present invention;

Fig. 5 is a schematic diagram of the embedded bearing of the tripod of the present invention.

Detailed ways

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.

A pitch-adjusting mechanism for a vertical-axis wind-driven generator, comprising blades and a tripod. The inner side of the blade 1 is provided with 2 groups of connecting plates arranged horizontally. Set, the connecting plate 2 on the left side is hinged with the front end of the connecting rod 7, the tail end of the connecting rod 7 is hinged with the side ears of the centrifugal slider 6 with side ears and has a sleeve structure, the sleeve of the centrifugal slider 6 is connected with the The support shaft 5 is clearance fit; one end of the connecting plate 2 on the right side and the hinge plate 3 is hinged by a rivet, and the other end of the hinge plate 3 is provided with a connecting block 4, and the connecting block 4 and the front end of the supporting shaft 5 are fixed by set screws The periphery of the supporting shaft 5 between the connecting block 4 and the centrifugal slider 6 is provided with a spring 8, and the two ends of the spring 8 are respectively in contact with the inner side of the connecting block 4 and the centrifugal sliding block 6; the tail end of the supporting shaft 5 Fixed with the fixed ring 10 on the main shaft 9, the lower end of the main shaft 9 and the output shaft of the generator 12 are fixed through the coupling 11, and the generator 12 is fixed on the ground; at the same time, the top of the tripod 13 is a disc structure with embedded bearings 16, The inner ring of the bearing 16 is in interference fit with the main shaft 9; the cover plate 14 and the top surface of the tripod 13 are fixed by screws.

The support shaft 5 inside the centrifugal slider 6 is provided with a cassette 15 .

There are three pairs of the 2 groups of connecting plates, which are evenly distributed with the upper, middle and lower points on the inner side of the blade 1.

The included angle between the blades 1 is 120°.

The blade 1 is a NACA97 type blade, which can be a resistance type "S" shape blade or a lift type blade. When starting, the blade 1 is a drag type blade; when the wind speed is relatively high, the blade 1 is automatically adjusted to be a lift type blade. As the speed increases, the centrifugal slider 6 will perform a centrifugal movement. At this time, the connecting rod 7 is driven to push the blade 1, so that the blade 1 moves relatively around the hinge and turns into a lift type blade. Simultaneously, because of the position-limiting effect of the cassette 15, because the cassette 15 just sticks to the position at the front end of the centrifugal slider 6 when the blade 1 changes into a lift-type blade, the centrifugal slider 6 is limited in movement and will not slide due to excessive wind speed. beyond the specified position. And a spring 8 is connected between the centrifugal slider 6 and the supporting shaft 5, and the spring 8 is just the original length when starting. When the wind speed drops, the rotational speed decreases, and the centrifugal slider 6 tends to move centripetally, and the spring 8 is in a compressed state at this time, pushing the slider to reset. And this mechanism adopts three-wing distribution, and the principles of each blade 1 and related parts are all as described above. At the same time, the tripod 13 supports the main shaft 9 . The inner ring of the bearing 16 embedded in the tripod 13 is in interference fit with the main shaft 9, so that the tripod 13 will not interfere with the rotation of the main shaft 9.

Claims (5)

1. A vertical axis wind turbine pitch device comprising a blade (1) and a tripod (13), characterized in that: the inner side of the blade (1) is provided with a connecting plate (2) group which is horizontally arranged, the connecting plate (2) groups are positioned on two sides of the longitudinal central line of the blade (1) and are arranged in pairs, the connecting plate (2) on the left side is hinged with the front end of a connecting rod (7), the tail end of the connecting rod (7) is hinged with a side lug of a centrifugal slider (6) with a side lug and a sleeve structure, and a sleeve of the centrifugal slider (6) is in clearance fit with a supporting shaft (5); the connecting plate (2) on the right side is hinged with one end of the hinged plate (3) through a rivet, the other end of the hinged plate (3) is provided with a connecting block (4), and the connecting block (4) is fixed with the front end of the supporting shaft (5) through a set screw; a spring (8) is arranged on the periphery of the supporting shaft (5) between the connecting block (4) and the centrifugal sliding block (6), and two ends of the spring (8) are respectively contacted with the inner sides of the connecting block (4) and the centrifugal sliding block (6); the tail end of the supporting shaft (5) is fixed with a fixing ring (10) on a main shaft (9), the lower end of the main shaft (9) is fixedly connected with an output shaft of a generator (12) through a coupler (11), and the generator (12) is fixed on the ground; meanwhile, the top of the tripod (13) is of a disc structure, a bearing (16) is embedded in the disc structure, and an inner ring of the bearing (16) is in interference fit with the main shaft (9); the cover plate (14) is fixed with the top surface of the tripod (13) through screws.

2. A vertical axis wind turbine pitch assembly as claimed in claim 1, wherein: the supporting shaft (5) at the inner side of the centrifugal sliding block (6) is provided with a clamping belt (15).

3. A vertical axis wind turbine pitch assembly as claimed in claim 1, wherein: the connecting plate (2) group is provided with three groups which are uniformly distributed with the upper, middle and lower three points on the inner side of the blade (1).

4. A vertical axis wind turbine pitch assembly as claimed in claim 1, wherein: the included angle between the blades (1) is 120 degrees.

5. A vertical axis wind turbine pitch assembly as claimed in claim 1, wherein: the blade (1) is an NACA97 type blade and is also a resistance type S-shaped blade or a lift type blade.