JPS62168970A - Power generation device utilizing kinetic energy of water current - Google Patents

Abstract

PURPOSE:To prevent a water turbine from rotating by itself while improve a flowing direction following property by providing two impellers in parallel and giving consideration to fixed vanes in a Voith Schneider propeller method vertical shaft type water turbine. CONSTITUTION:Two impellers 2a, 2b are provided with their rotary shafts in parallel. These impellers 2a, 2b are arranged to rotate mutually in the opposite directions to prevent a water turbine from rotating by itself. Further, two fixed vanes 1, 1 are provided on both outsides of the impellers 2a, 2b. And, in order to improve a flowing direction following property, these fixed vanes 1, 1 are symmetrically provided in such a way that the flow-in area for water current of the fixed vanes 1, 1 is smaller than the flow-out area.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device that generates power by utilizing the kinetic energy of river currents, tidal currents, or ocean currents.

Conventional technology The power conversion table for converting the kinetic energy of water flow into mechanical motion is categorized into rotating shafts. Blanc water wheel system,
Deformed water turbine system in the duct (Special Public Interest Publication Showa 57-16263
(mentioned in the publication).

B. Vertical shaft type A system with a water wheel rotation axis perpendicular to the flow, Voith-Schneider propeller system, Kurakake system (Special Publication Publication No. 52-144)
No. 548), servonia rotor one type (for example, Japanese Patent Publication No. 55-69768 using this method)
Examples include the one described in the publication), the paddle-equipped water turbine system, and the Darius rotor one-way system.

Other methods include a sail canopy system in which multiple parachutes are connected to a ring-shaped rope, and a system in which the wings vibrate in the flow.

Problem to be solved by the invention The total amount of kinetic energy possessed by river currents, tidal currents, and ocean currents is true. However, the flow rate of rivers fluctuates depending on the season and year. In tidal currents, the direction of the current reverses periodically. In addition, the axis and velocity of ocean currents change depending on the season and year, and depending on the presence of cold water masses.Moreover, the current velocity is relatively slow and the energy density is low.Furthermore, the vertical velocity distribution of river currents, IWI currents, and trB flows is It's not uniform.

The above problems can be categorized as follows.

(a) Fluctuation in flow velocity (b) Fluctuation in flow axis (c) Low energy density (d) Non-uniformity in vertical velocity distribution In horizontal axis type power converters, problem (a) can be solved by
By adopting variable pitch blades, we can always aim for the maximum efficiency of the water turbine, and by using a directional stabilizer to solve problem (b), we can always point the rotating shaft in the mainstream direction, and to solve problem (c), we can always aim for the maximum efficiency of the water turbine. By adopting this method, the energy density of the water flow can be spatially increased, but regarding problem (d), the efficiency of the water wheel decreases as the diameter of the water wheel increases.

On the other hand, in the case of a single straight shaft type power converter, the Feutschneider propeller system has a mechanism that can change the blade pitch to solve the problem (a), but the other systems do not, and (b) For the problem, all systems except the Feutschneider propeller system are non-directional and do not require any special equipment; for the problem (c), no equipment has been considered for all systems so far; for the problem (d), On the other hand, with the Darius rotor single type and Voith-Schneider propeller type, it is possible to design the blade shape in the depth direction according to the velocity distribution in the depth direction.

The present invention adopts the Voith-Schneider propeller system among the vertical shaft type water turbines from among the various water turbines mentioned above, with the aim of developing a device that solves all of the problems (a), (b), (c), and (d). do. However, the method is (b) and (c)
There are problems with this.

Means for Solving the Problems Means for solving the problems described above will be explained below using FIGS. 1 to 4 corresponding to the embodiments.

Voith-Schneider propeller type vertical shaft type water turbine that has multiple blades (3) that make one reciprocating pitching motion each time it rotates, and the pitch angle of the blades is set by an eccentric shaft placed perpendicular to the inflow direction of the water flow. A. Arrange two units so that their eccentric shafts face each other.

B. Two fixed plates R (1) are arranged symmetrically on the outside of the periphery of the two water turbines (2a) and (2b) so that the inflow area of the water flow between them is smaller than the outflow area.

We are taking technical measures.

Effect: The technical means A above eliminates the self-rotating property of the device that is present in the case of a single water turbine, and the technical means B above provides flow direction followability and increases the inflow velocity.

Now, output coefficient cp and circumferential speed ratio τSR per water turbine
Look at the relationship between here.

Cp = 2z nQ/ 0.5p 1sDT
SR= *nD/V. however,
π is pi, n is the rotation of the water wheel (r, p, s,), Q is the torque acting on each water wheel, p is the fluid density, S is the length of the blades below the water surface, and V is the water flow. Flow velocity, 0 is the diameter of the water turbine. Figure 5 shows the relationship between the output coefficient and the circumferential speed ratio. Here, the solid line (14) is for the case of only one water turbine.

The dotted line (15) shows the case of two water turbines, and the dashed line (16) shows the case of two water turbines with fixed blades.

With technical measure A, as shown in Figure 1, the maximum value of the output coefficient hardly changes, but the value of the circumferential speed ratio at which the output coefficient becomes maximum increases, and the circumferential speed ratio range in which the kinetic energy of water flow can be absorbed expands. .

Technical means B not only further expands the circumferential speed ratio range in which the kinetic energy of the water flow can be absorbed, but also increases the maximum value of the output coefficient. In other words, the energy density of the water flow has been increased.

These have been confirmed by aquarium experiments and sea experiments. Through these technical measures, the disadvantages of the Feutschneider propeller type vertical shaft water turbine, (mouth) and (
Problem c) will be resolved.

EXAMPLES The present invention will be explained in more detail below based on the drawings.

Fig. 1 shows a plan view of a power generation device using the kinetic energy of water flow according to the present invention, Fig. 2 shows an elevational view thereof, and Fig. 3 shows a plan view of a pitch control section of a water turbine blade. Figure 4 shows its elevation.

Two fixed pieces 1 (1) are arranged symmetrically on the outside of the two water turbines (2a) and (2b). Moreover, fixed wing (
1) The fixed blades (1) are set at an angle of attack so that the inflow area of the water flow between the fixed blades (1) is smaller than the outflow area to the extent that stall does not occur around the fixed blades (1).

The eccentric shafts (13) of the two water turbines, which are spatially fixed by the fixing # (4), are arranged perpendicularly to the inflow direction of the water flow and facing each other.

The rotating shaft (11) of the blades (3) of the water turbine is connected to the eccentric shaft (13) by a connecting rod (12), and the pitch angle of the blades (3) depends on the position of the eccentric shaft (13) in the radial direction of the water turbine. One blade (3) whose size is determined is set perpendicular to the connecting rod (12).

Next, the operation of this embodiment will be explained. When water flows into the device, downstream the left water wheel (2a) rotates counterclockwise and the right water wheel (2b) rotates clockwise without the need for starting torque. Each blade (3) of the water wheel makes one reciprocating pitching motion every time the water wheel (2m), (2b) rotates once.

The rotational torque applied to the blades (3) of each waterwheel (2a), (2b) is transmitted to the bevel gear (5), and the rotational torque from the two waterwheels is combined through the connection shaft (7) to generate power to the outside. is transmitted.

Figures 6, 7 and Ii! i8 shows an example of the use of the power generation device that utilizes the kinetic energy of water flow according to the present invention.

FIG. 6 shows a case where the rotating shaft of the water turbine is set in the vertical direction of the sea surface or the water surface, and the device of the present invention is floated on the sea surface or the water surface of a river, and is moored to the seabed or the bottom of the river.

This is made possible by giving the fixed wing (1) buoyancy to balance the weight of the entire device, and by lowering the center of gravity of the entire device and bringing the metacenter to a level higher than the center of gravity.

Figure 7 shows a case in which the equipment is submerged under the sea surface or moored to the seabed or the bottom of a river. Unlike Figure 5, the rotation axis of the water turbine is installed at the sea surface or parallel to the water surface. . In this case, it is effective when the water turbine is to be avoided from the influence of waves or when it becomes an obstacle to the navigation of ships.

FIG. 8 shows a case where the device is fixed to the seabed or the bottom of a river. In this case, it is effective when the water depth is shallow or when the navigation of a ship is obstructed.

Effects of the Invention The device of the present invention efficiently utilizes the natural energy of river currents, tidal currents, and ocean currents, and increases their energy density.
It can be installed in a floating or fixed state and used as a power generation device or as a general fluid machine that requires rotational torque.

[Brief explanation of drawings]

FIG. 1 is a plan view of a power generation device using the kinetic energy of water flow, showing an embodiment of the present invention, and FIG. 2 is an elevational view thereof. FIG. 3 is a plan view of a blade pitch control mechanism of a Voith-Schneider propeller type vertical shaft water turbine, and FIG. 4 is an elevational view thereof. FIG. 5 is a diagram showing the relationship between the output coefficient and the circumferential speed ratio for explaining the effect of absorbing the kinetic energy of water flow in the device according to the present invention. 6 to 8 are diagrams showing examples of use of the present invention.

Claims (1)

[Claims] The device has a rotation axis perpendicular to the inflow direction of the water flow, has a plurality of blades that make one reciprocating pitching motion with each rotation, and the pitch angle of the blades is arranged at right angles to the inflow direction of the water flow. In a Voith-Schneider propeller type vertical shaft water turbine set by an eccentric shaft, (1) the two water turbines are arranged so that their eccentric shafts face each other, and two fixed blades are arranged symmetrically on both outsides of them. A power generation device that uses the kinetic energy of water flow. (2) A power generation device using the kinetic energy of a water flow according to claim 1, wherein the inflow area of the water flow between the two fixed blades is narrower than the outflow area thereof.