Patent Application
20140255160
This Non-provisional application claims priority of Chinese Patent Application No. 201310074235.0 filed on Mar. 8, 2013, the entire contents of which are hereby incorporated by reference.
1. Field of the Invention
The present invention relates to a hydro turbine.
2. Description of the Related Art
Tidal hydro turbines in the prior art mainly use wind power generation technology for reference and are classified into two kinds. One kind is the hydro turbine with a horizontal shaft. The impeller of the hydro turbine has only two or three blades, usually without a large flow guiding dome, but the efficiency thereof is generally low. The other kind is the hydro turbine with a vertical shaft borrowing ideas from the wind power generation. The impeller of the hydro turbine basically has three to five blades, and some have more than ten blades. This impeller is a traditional double-impact impeller and has efficiency slightly higher than that of the impeller of the three-blade hydro turbine with the horizontal shaft, on condition that a large flow guiding dome is provided.
Nowadays, with the increasing shortage of energy and the increasing serious greenhouse effect, energy is required to be low-carbon. Thus, clean energy, such as wind energy and ocean energy (including tidal energy, the tidal current energy, the ocean wave energy, and the ocean current energy), will be the future direction of energy development. However, the power generating devices for the clean energy are still developing, and the utilization of ocean energy is still in the initial stage, except for the relatively mature wind energy utilization. No common and mature devices are available. The devices cannot be large-scaled, have low efficiency, and fail to reach a completely satisfied level.
To overcome the technical deficiencies in the prior art, the present invention provides a hydro turbine having multiple blades and high efficiency.
To fulfill the mentioned aim, the present invention adopts the following technical solutions. A hydro turbine includes at least two annular wheel discs, a center shaft, a plurality of spokes, and a plurality of blades. The center shaft is disposed at the centers of the annular wheel discs. The axis direction of the center shaft is vertical to radial directions of the annular wheel discs. The spokes are disposed between the annular wheel discs and the center shaft and disposed along the radial directions of the annular wheel discs. A plurality of blades is annularly disposed at the annular wheel discs. The number of the blades is at least 28 and at most the integer number of an outer circumference measured in centimeters of one annular wheel disc. The blades are arc-shaped, and the sum of arc length of one side of all the blades is 0.85-2 times the outer circumference of one annular wheel disc. A blade angle is formed between two line segments respectively connecting the middle point to the two endpoints of an arc of each blade, and the blade angle is in a range of 100°-170°. A blade installation angle is formed between the chord line having the maximum chord length of the arc of each blade and a radius line of each annular wheel disc passing through an outer endpoint of the blade, and the blade installation angle is in a range of 15°-75°.
Preferably, the center shaft is a hollow shaft.
Preferably, the hydro turbine further includes two cover plates respectively disposed on sides of the two annular wheel discs back to the blades.
The present invention has the following beneficial effects: the efficiency of the hydro turbine is directly proportional to the number of the blades, so the increase of the number of the blades can greatly improve the working efficiency. Experimental data shows that the efficiency of the power generation device using the hydro turbine in the invention is 1.4-1.5 times that of the traditional vertical-shaft power generation device. In addition, the friction force between the hydro turbine and the center shaft is reduced by the buoyancy of the hollow center shaft generated by itself, so the working efficiency is effectively improved. Further, the hydro turbine is applicable to tidal current and has self-startup capabilities at various current speeds.
These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings.
To ensure that those skilled in the art better understand the scheme of the present invention, the technical scheme in the embodiment is clearly and completely described below with reference to drawings attached to the embodiment of the present invention. Obviously, the embodiment is only a schematic one of the present invention and cannot be regarded as limit of the present invention. Based on the embodiment in the present invention, all other embodiments made by those skilled in the art without creative labor all belong to the protection scope of the present invention.
The following embodiment of the present invention is described with reference to the attached drawings. A hydro turbine includes a center shaft 1 and at least two annular wheel discs 2. The center shaft 1 is installed at the centers of the annular wheel discs 2. The axis direction of the center shaft 1 is vertical to radial directions of the annular wheel discs 2. Spokes 3 are installed between the annular wheel discs 2 and the center shaft 1 and disposed along the radial directions of the annular wheel discs 2. A plurality of blades 4 is fixedly installed at the annular wheel discs 2. The length directions of the blades 4 are parallel to the center shaft 1. If the blades 4 of the hydro turbine are relatively long, a plurality of annular wheel discs 2 can be uniformly installed along the axis direction of the center shaft 1 according to actual requirements, and a plurality of blades 4 is annularly disposed among the annular wheel discs 2. That is, the longer blades are cut into shorter ones and connected into a whole through the multiple annular wheel discs 2, so as to improve firmness. The number of the blades 4 is at least 28 and at most the integer number of an outer circumference measured in centimeters of one annular wheel disc 2. For example, the outer circumference of the annular wheel disc 2 is 98.3 or 98.8 cm, and then the number of the blades 4 can be 98. The blades 4 are arc-shaped. The sum of arc length of one side of all the blades 4 is 0.85-2 times the outer circumference of one annular wheel disc 2. The mentioned side of all the blades is shown in
In certain cases, the efficiency of the hydro turbine is directly proportional to the number of the blades 4, thereby greatly improving the efficiency. Experimental data shows that the efficiency of the power generation device using the hydro turbine in the invention is 1.4-1.5 times that of the traditional vertical-shaft power generation device. In addition, the center shaft 1 is a hollow shaft, and the friction force between the hydro turbine and the center shaft 1 is reduced by the buoyancy of the hollow center shaft 1 generated by itself, so the working efficiency is effectively improved. Moreover, the hydro turbine is applicable to tidal current and has self-startup capabilities at various current speeds.
In the embodiment, the hydro turbine further includes two cover plates 5 respectively disposed on sides of the two annular wheel discs 2 back to the blades 4. As shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| 201310074235.0 | Mar 2013 | CN | national |
