JP2013127236A - Impeller for water flow power generation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impeller for water flow power generation capable of stably rotating upon receiving water flow and generating a higher torque with a blade having the same diameter.SOLUTION: In the impeller for water flow power generation, a plurality of fan-shaped blades each having a mounting angle relative to an axis perpendicular line and an outer cylindrical body disposed at an outer periphery thereof are fixed to an outer periphery of a coaxial body. Partitioning blades as many as or more than the fan-shaped blades in number, each having the mounting angle relative to the axis perpendicular line are integrated with an outermost cylindrical body at an outer periphery of the partition blades. This remarkably improves a rotational torque by water flow, compared with a structure including the fan-shaped blades having the same diameter and the outer cylindrical body.

Description

  The present invention relates to a technique for efficiently extracting energy from a fluid using a water turbine or a screw or propeller (hereinafter referred to as “impeller”) that generates power in a tidal current / Kuroshio current, a river, or an artificial waterway.

  Conventionally, hydroelectric power generation that uses natural energy to generate electricity does not require fuel, has no harmful emissions, has a sufficiently high density of water, and thus has a large energy, unlike wind power generation, it can accurately predict output, Stable power supply can be performed.

  In this way, as an impeller that generates electricity using a water flow, a plurality of inverted taper fan blades having a mounting angle with respect to the axis perpendicular to the axis are disposed between the shaft body at the center of the propeller and the cylinder body at the outer periphery. There are some which are arranged in an integrated manner (for example, see Patent Document 1).

Japanese Patent Application No. 2011-162549

  For example, if the fluid velocity has the same strength, it is advantageous to gain torque at the outer peripheral portion having a large peripheral speed that can generate higher torque.

  Further, as a result of repeated research on the problem of strength accompanying the increase in the size of the impeller and whether there is an impeller that generates higher torque with the same impeller diameter, the following invention has been achieved.

  In order to achieve the above-mentioned problems, the invention of claim 1 is characterized in that the outer periphery of the outer cylinder disposed on the outer periphery of a plurality of fan-shaped blades having a mounting angle with respect to the axis perpendicular to the outer periphery of the concentric shaft body, A partition blade having the same number as the mounting angle or having a mounting angle corresponding to the set flow velocity and having more than the number of fan blades is arranged radially, and the outermost cylindrical body is fixed and integrated on the outer periphery of the partition blade.

  By doing so, by allowing the water flow to pass through the space formed by the partition blade between the outer cylinder and the outermost cylinder without escaping to the outside, the drag generated by the water flow is generated in the partition blade, and the blade If the vehicle outer diameter is the same, the rotational torque due to the water flow of the impeller is significantly increased as compared with the fan blade + outer cylinder.

  Further, it is possible to further form partition blades and outermost cylinders, that is, two or more layers of partition blades, on the outer periphery of the outermost cylinder body, which are determined in consideration of various conditions such as generated torque and manufacturing cost. That's fine.

  Here, the fan blades and the partition blades are made of a single plate or a composite plate (hereinafter referred to as “flat plate”) without bending or twisting, and for example, when the flow direction is a left flow, the fan blades and the partition blades are turned to the left. For example, in the case of the right flow, the rotation is right, and both the left flow and the right flow generate the same rotation speed and rotation torque. That is, the impeller remains in the state even if the tide flow direction changes by 180 °. Good.

  Here, in the invention of claim 2, in order to prevent disturbance of the water flow, an R-shaped sealing agent adhesion or a current plate is fixed to the outer periphery of the fan blade and the partition blade.

  Therefore, according to the present invention, if the impeller diameter is the same, the rotational torque due to the water flow can be remarkably increased as compared with the fan-shaped blade + outer cylinder.

  Side views (a) and (b) of an impeller according to an embodiment of the present invention are front views.   It is an AA arrow line view of FIG.   It is an expanded sectional view of the partition blade | wing part of FIG.   It is an expanded sectional view of the fan-shaped blade | wing part of FIG.

  As shown in FIG. 1, a plurality of fan-shaped blades 102 having a reverse taper shape having a mounting angle θa with respect to the axis perpendicular to the outer periphery of a concentric shaft body 101 are fixed by, for example, welding. A ring-shaped outer cylindrical body 103 is fixed to the outer periphery of the fan, and an R-shaped rectifying plate 104 is fixed to the outer peripheral side of the fan-shaped blade 102.

  The blade configuration is the same as that of Patent Document 1. For example, in an experimental machine, four fan blades 102 have an outer diameter of 170 mm, a shaft body 101 has an outer diameter of 34 mm, a receiving surface angle θb = 60 °, a mounting angle θa, and a flow velocity v =. When the speed was 0.5 m / s to 1.4 m / s, the rotational speed and generated torque of the impeller were roughly obtained as follows.

In summary,
・ When the mounting angle θa = 20 °, the rotation speed is 90 to 175 rpm and the torque is 0.7 to 1.8 kg · cm.
・ When the mounting angle θa = 30 °, the rotational speed is 80 to 155 rpm, and the torque is 1.0 to 2.6 kg · cm.
・ When the mounting angle θa = 45 °, the rotation speed is 76 to 115 rpm, and the torque is 1.7 to 3.1 kg · cm.
Met.

  As a result, the mounting angle θa is preferably 40 ° to 45 °, and the starting flow velocity of the impeller is about 0.25 m / s. From the flow velocity of 0.5 m / s or more, for example, the number of poles of the generator Is 48 rpm, the rated rotation speed is 150 rpm at 60 Hz, and this machine can generate power with a speed increase ratio of 3 or more before the generator. If the number of poles is increased, a speed increaser (not shown) is unnecessary. .

  Next, as shown in FIGS. 1 to 4, the partition blades 112 having the number of fan-shaped blades having an attachment angle θa with respect to the axis perpendicular to the axis are arranged outside the outer cylinder 103, and the outer periphery of the partition blades 112 is arranged. An outermost cylindrical body 113 is fixed, and an R-shaped rectifying plate 114 is fixed to the outer periphery of the partition blade 112 to be integrated with the shaft body 101 and the fan-shaped blade 102.

  By doing so, in addition to the drag due to the water flow of the fan blades 102, the water flow passes through the space formed by the outer cylinder 103, the partition blades 112, and the outermost cylinder 113 without escaping to the outside. A stronger rotational torque is generated by the drag of the water flow of the blades 112.

  As shown in FIG. 1, in the experimental machine of the impeller 10 in which the fan blade 102 and the partition blade 112 are combined, for example, the shaft 101 has an outer diameter of 34 mm, the fan blade 102 has an outer diameter of 110 mm, the partition blade has an outer diameter of 170 mm, and the receiving surface angle θb. = 60 °, the generated torque of the impeller 10 with the flow velocity v = about 0.8 m / s obtained the following results.

  When the mounting angle θa = 45 °, the generated torque is about 3.9 kg in the impeller of FIG. 1 compared to about 2.6 kg · cm in the four fan-shaped blades + outer cylinder system, which is equivalent to Patent Document 1. * It becomes cm, and the rotational torque by a water flow can be increased markedly.

  Here, the fan blades 102 and the partition blades 112 are flat and not curved and twisted. For example, if the flow direction is a water flow 1, the rotation is counterclockwise and the water flow 2 is a right rotation, and the impeller 10 rotates. Although the direction is different, the rotational speed and rotational torque due to the flow velocity are almost the same. That is, even if the flow direction of the tide changes by 180 °, the impeller 10 does not turn 180 °, but can generate hydroelectric power as it is. it can.

DESCRIPTION OF SYMBOLS 1 Water stream 2 Water stream 10 Impeller 101 Shaft body 102 Fan-shaped blade 103 Outer cylinder body 104 Rectifier plate 112 Partition blade 113 Outermost cylinder body 114 Rectifier plate θa Mounting angle θb Reception surface angle

Claims (2)

On the outer periphery of the concentric shaft body, a plurality of fan-shaped blades having a mounting angle of 30 ° to 45 ° with respect to the axis perpendicular to the axis are fixed to the inner surface of the ring-shaped outer cylindrical body on the outer periphery, and On the outer periphery of the outer cylinder, a flat plate-like partition blade having an attachment angle of 30 ° to 45 ° with respect to the axis perpendicular to the axis is arranged, and the partition blade is disposed on the inner surface of the outermost cylindrical body on the outer periphery. An impeller for hydroelectric power generation characterized by being fixed. The impeller according to claim 1, wherein an R-shaped rectifying unit or a rectifying plate is fixed to the outer periphery of the fan blade and the partition blade.

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