WO2014135073A1

WO2014135073A1 - Hydroturbine

Info

Publication number: WO2014135073A1
Application number: PCT/CN2014/072871
Authority: WO
Inventors: 林东; 黄长征; 陈正瀚; 徐虔诚
Original assignee: 杭州林黄丁新能源研究院有限公司
Priority date: 2013-03-08
Filing date: 2014-03-04
Publication date: 2014-09-12
Also published as: LU92485B1; GB2511593A; JP2015516535A; GB201318498D0; KR20140120881A; CN103573529B; CN103573529A; US20140255160A1

Abstract

A hydroturbine, comprising at least two rotors (2), a central shaft (1), and a plurality of vanes (4); the central shaft (1) is disposed in the center of the rotors (2); the axial direction of the central shaft (1) is perpendicular to the radial direction of the rotors (2); the plurality of vanes (4) are arranged around the rotors (2); the number of vanes (4) is at least 28, and at most an integer of a rotor(2) outer circumference in centimeters; the vanes (4) are arc-shaped, the sum of the arc lengths of the arcs of all the vanes (4) being 0.85-2 times the rotor (2) outer circumference; an included angle formed by the two line segments from the midpoint of the arc of the vane to the two endpoints thereof forms an included angle of the vane, the included angle being within the range of 100-170 degrees; and an included angle formed by the longest chord of the arc of the vane and a rotor radius extending past the outer endpoint of the vane forms a vane mounting angle, the vane mounting angle being between 15-75 degrees. The efficiency of a power generation device employing the hydroturbine is more than twice the efficiency of a traditional vertical-axis power generation device.

Description

Turbine technology

The invention belongs to the field of ocean energy power generation, and in particular to a water turbine.

Background technique

The prior art tidal turbines mainly draw on the technology of wind power generation, and are divided into two types: one is that the impeller of the horizontal-axis turbine is three-bladed or two-bladed, mainly the speed-increasing and mechanical systems such as generators under the water. Operation, routine maintenance and maintenance are extremely difficult, resulting in expensive costs, resulting in no commercial development value; the other is a wind turbine impeller that draws on the vertical axis. The number of blades of the turbine impeller is basically three to five blades, and there are more than ten The turbine impeller of the blade is slightly less efficient than the three-blade turbine wheel on the horizontal axis.

However, traditional tidal turbines ignore the blind spots in traditional technology and have technical misunderstandings. Conventional tidal turbines are made by impellers that mimic wind energy. However, wind turbines use a higher starting speed of wind energy (at least 6 m/s) to generate electricity with fewer blades. However, the current of the current is much lower than the wind speed (the ideal state is 3m/s, usually lower), so the traditional tidal turbine cannot capture the tidal energy at low flow rates.

Nowadays, energy shortages are increasing, the greenhouse effect is becoming more and more serious, and energy is increasingly low-carbon. Therefore, clean energy such as wind energy and ocean energy (including tidal energy, tidal current, wave energy and ocean current energy) is the future development direction of energy. But now these clean energy power generation equipments, in addition to the relatively mature use of wind energy, the use of ocean energy is still in its infancy, there is no universal and mature equipment, equipment can not be large-scale, inefficient, still not fully satisfactory s level.

Summary of the invention

The present invention addresses the deficiencies of the prior art and provides a multi-blade high efficiency turbine.

To achieve the above object, the present invention can adopt the following technical solution: A water turbine includes at least two annular disks, a center shaft, and a plurality of blades. A central shaft is disposed at a center of the annular disk, and an axial direction of the central shaft is perpendicular to a radial direction of the annular disk. A plurality of blades are disposed on the annular wheel. The number of blades is at least 28 pieces, and is at most an integer number of centimeters of the outer circumference of the annular disk. The blades are curved, and the sum of the arc lengths of one of the curved sides of all the blades is between 0.85 and 2 times the outer circumference of the annular disk. The angle between the midpoint of the curved edge of the blade and the line segment at the two end points constitutes the angle of the blade. The angle between the blades is between 100 and 170 degrees. The angle between the maximum chord length of the curved edge of the blade and the radius of the annular disk at the outer end of the blade is the blade mounting angle, and the blade mounting angle is between 15 and 75 degrees.

In an embodiment of the invention, the water turbine further includes a plurality of spokes disposed along a radial direction of the circular wheel.

In an embodiment of the invention, the water turbine further includes two cover plates, the two cover plates being respectively disposed on one side of the two annular disks facing away from the blades.

The beneficial effects of the present invention are as follows: According to all documentary descriptions and actual implementations, the existing vertical axis turbines are incapable of generating electricity at low water flow (current velocity of 3 m/s or less). The conversion rate of its capture trend is no more than 10%, so the trend can not be commercialized around the world. However, the turbine of the present invention overcomes the blind spot in the conventional technology by using at least 28 blades and a specific angle setting, and at a low flow velocity of a flow velocity of 3 m/s or less, overcoming the blind spot in the conventional technology. The trend of development can provide a technical foundation. The experimental data shows that the efficiency of the power generating unit using the turbine is more than twice that of the conventional vertical shaft power generating unit.

DRAWINGS

Fig. 1 is a front view of a water turbine of the present invention.

2 is a top plan view of a water turbine of the present invention.

Fig. 3 is a schematic view showing the angle structure of the blade of the present invention.

Figure 4 is a schematic view showing the structure of the blade mounting angle of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. Based on the embodiments of the present invention, those obtained by those of ordinary skill in the art without creative efforts Other embodiments are intended to fall within the scope of the invention.

Embodiments of the present invention will be described below with reference to the drawings. A water turbine includes a center shaft 1, at least two annular disks 2, and a plurality of blades 4. A plurality of blades 4 are circumferentially disposed on the annular wheel. In practical applications, the length of the blade 4 is perpendicular to the annular disk 2. In the present embodiment, the annular wheel 2 is a hollow circle, that is, a ring shape. However, the present invention is not limited thereto. In other embodiments, the annular wheel 2 can be a solid circle. The number of annular disks 2 of the present invention is at least two, located on either side of the blade 4, thereby confining the blade 4 between the two annular disks 2. In the present embodiment, the number of the annular reels 2 is three, and one of the annular reels 2 is disposed in the middle of the vane 4. With this arrangement, the length of the blade 4 is effectively reduced (in practical applications, the length is the length of the blade 4 along the horizontal plane), thereby increasing the resistance of the blade 4 to the impact of the water flow. If the length of the blade 4 in the vertical direction is too long, the blade 4 is easily deformed or even broken due to the large impact force of the water flow. However, the present invention does not limit the specific number of the ring-shaped reels 2 to any particular one. As the length of the blade 4 increases, the number of the ring-shaped reels 2 also increases accordingly.

The number of the blades 4 of the present invention is at least 28 pieces, and is at most an integer number of centimeters of the outer circumference of the annular disk 2. For example, the outer circumference of the annular wheel 2 is 98.3 or 98.8 cm, and the number of the blades 4 can be 98 pieces. The vanes 4 are curved, and the sum of the arc lengths of one arcuate side of all the vanes 4 is between 0.85 and 2 times the circumference of the outer circumference of the annular disc. The angle A of the blade is the angle formed by the midpoint of the curved edge of the blade to the line segment at the two end points (as shown in Fig. 3), and the angle A of the blade is greater than or equal to 100 and less than or equal to 170 degrees. The blade mounting angle B is the angle between the maximum chord line of the curved edge of the blade and the radius line of the annular disk at the outer end of the blade (as shown in FIG. 4), wherein the blade mounting angle B is greater than or equal to 15 degrees and less than or equal to 75 degrees. degree. In the implementation, the blade mounting angle B can be selected from 15, 45, 60 degrees, and the like.

The central shaft 1 is disposed at the center of the annular disk 2, and the axial direction of the central shaft 1 is perpendicular to the radial direction of the annular disk 2. When the water turbine of the present invention is applied to a marine energy generating device, one end of the center shaft 1 is connected to a generator. When the water flow impinges on the blade 4, the blade 4 rotates, the rotation of the blade 4 drives the annular disk 2 to rotate, and the rotation of the annular disk 2 drives the central shaft 1 to rotate, and the central shaft 1 transmits kinetic energy to the generator. In the present embodiment, the number of the center shafts 1 is one, and the center shaft 1 is provided with a plurality of annular disks 2. In other embodiments, the number of central axes 1 can be two. Two central axes 1 are respectively arranged on the outermost side The annular wheel 2 faces away from the center of the blade 4 side.

In the present embodiment, the water turbine further includes a plurality of spokes 3 which are disposed along the radial direction of the annular wheel 2. In the present embodiment, the spokes 3 are fixed between the circular wheel 2 and the center shaft 1. The fixed connection between the annular disk 2 and the central shaft 1 is reinforced by the provision of the spokes 3. However, the present invention is not limited thereto. In other embodiments, the turbine may not have spokes 3.

In the present embodiment, the water turbine further includes two cover plates 5, which are respectively disposed on one side of the two annular disks 2 facing away from the blades 4. As shown in Fig. 1, the cover plates 5 are respectively located above the upper ring-shaped reel 2 and below the lower ring-shaped reel 2. By providing the cover 5, it is possible to effectively prevent the water flow from entering from the gap between the center shaft 1 and the annular wheel 2 from above and below, thereby ensuring the working efficiency of the turbine. However, the present invention is not limited thereto. In other embodiments, the water turbine may not have a cover 5.

When the ocean flow rate is fast, the fewer the number of blades of the turbine, the higher the power generation efficiency, and the excessive number of blades of the turbine, which blocks the water flow and makes it unable to flow into the turbine for efficient power generation. However, under low ocean flow conditions, an increase in the number of turbine blades can greatly increase power generation efficiency. In other words, the number of turbine blades is inversely proportional to the ocean velocity. The experimental data shows that the efficiency of the power generating device using the water turbine of the present invention is more than twice that of the conventional vertical axis turbine power generating device. The water turbine of the present invention overcomes the drawbacks of conventional turbines that cannot be started and efficiently generated at low ocean flow rates by employing at least 28 blades and having specific blade angles and blade mounting angles. The turbine of the present invention is particularly suitable for reciprocating water flow (e.g., tidal current) and has self-starting capability at various flow rates.

In summary, the beneficial effects of the present invention are: According to all documentary descriptions and actual implementations, the existing vertical axis turbines are incapable of generating electricity at low water flows (flow currents of 3 m/s or less). The rate of capture of the tide is not more than 10%, so the trend can not be commercialized around the world. However, the turbine of the present invention provides a technical basis for human tidal energy development by using at least 28 blades and a specific angle setting at a low flow velocity of 3 m/s or less. .

Claims

WO 2014/135073 Claim PCT/CN2014/072871

A water turbine, comprising:

At least two annular wheels;

a central shaft disposed at a center of the annular disk, the axial direction of the central axis being perpendicular to a radial direction of the annular disk;

a plurality of blades, disposed on the annular wheel, having a minimum number of blades of 28, at most an integer number of centimeters of the outer circumference of the annular disk, the blades being curved, and the arc length of one curved edge of all the blades The sum of the outer circumference of the annular disk is between 0.85 and 2 times, and the angle between the midpoint of the curved edge of the blade and the line segment of the two end points constitutes an angle of the blade, and the angle of the blade is between 100 and 170 degrees. The angle between the maximum chord length of the curved edge of the blade and the radius of the annular disk at the outer end of the blade is the blade mounting angle, and the blade mounting angle is between 15 and 75 degrees.

2. The water turbine according to claim 1, wherein the water turbine further comprises a plurality of spokes disposed along a radial direction of the circular wheel.

3. The water turbine according to claim 1, wherein the water turbine further comprises two cover plates, the two cover plates being respectively disposed on one side of the two annular disks facing away from the blade.