JP2013096318A - Water stream cone body with built-in flow straightening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water stream cone body with a built-in flow straightening device, which by means of the flow straightening device, can prevent degradation in utilization efficiency of water power and improve the utilization efficiency in a device comprising the water stream cone body, by increasing the discharge quantity of sucked water from a rear end of the water stream cone body by preventing generation of an eddy current of sucked water within the water stream cone body.SOLUTION: A flow straightening device 2 is built in a water stream cone body 1 which is formed in cylindrical cone. The flow straightening device 2 includes a tapered bar 2a which is diametrically enlarged from a front end side to a rear end side, and a guide vane 2b extending in the axial direction of the tapered bar 2a. The tapered bar 2a has a tapered bar diametrically enlarged part 20a and a tapered bar narrowed part 20b which is diametrically reduced gradually in such a way that an outer surface 20c is gradually diametrically reduced in an arcuate shape from the tapered bar diametrically enlarged part 20a to a rear end portion 2d. In the water stream cone body 1, a diameter of a distal end portion 1c is smaller than that of the rear end portion 1d. The water stream cone body 1 further includes a cone body diametrically enlarged part 10a and a cone body narrowed part 10b which is diametrically reduced gradually in an arcuate manner from the cone body diametrically enlarged part 10a to the rear end portion 1d.

Description

  The present invention relates to a cylindrical water flow cone body that is installed in water such as a river or the sea and uses a flowing energy (river current, tidal current, sea current) and a rectifier built in a cylindrical water flow cone body.

  As an existing technique, an underwater power generation apparatus including a plurality of water flow cone bodies is disclosed. The water flow cone body sucks water from the front end side of a river or the like outside the apparatus and discharges it from the rear end side, and has a cylindrical shape formed in a conical shape. Moreover, the inner surface of the water flow cone body is formed in a funnel shape constricted on the tip side, and the tip side is tapered (for example, Patent Document 1).

  This underwater power generation device can efficiently use the hydroelectric energy generated by running water in a river or the like by increasing the speed of the water flow near the tip of the water flow cone body.

Utility model registration No. 3138373

  However, since the water flow cone body described in Patent Document 1 has a conical cylindrical shape, the taper angle of the water flow cone body inner surface is designed to be wide, so that the suction water passing through the water flow cone body is the inner surface of the water flow cone body. It flows downstream while colliding with and generating a vortex. This eddy current has a problem in that it causes a loss of hydraulic energy, resulting in a decrease in the utilization efficiency of the hydraulic energy of the underwater power generation apparatus.

  The present invention has been made in view of the above circumstances, and the rectifier prevents the vortex of suction water from being generated inside the water flow cone body, and discharges the suction water from the rear end of the water flow cone body. It is an object of the present invention to provide a water flow cone body incorporating a rectifier capable of preventing reduction and improvement of the utilization efficiency of hydraulic energy of a device having a water flow cone body by increasing the amount.

  In order to solve the above problems, the water flow cone body incorporating the rectifier of the present invention has a cylindrical shape, a water flow cone body for feeding water from the front end side toward the rear end side, and the water flow cone body inside the water flow cone body. The water flow cone body includes a rectifier arranged, and the cone of which the diameter of the front end portion is smaller than the diameter of the rear end portion and whose outer surface and inner surface increase in a taper shape from the front end side toward the rear end side. A body diameter-enlarged portion, and a cone body constricted portion that gradually decreases in diameter from the cone body diameter-enlarged portion to the rear end portion without being concave, and the rectifier includes the water flow cone body A taper bar extending along the axial direction, and a guide vane formed on the taper bar so as to extend in the axial direction. The taper bar has an outer surface that increases in diameter in a tapered shape from the front end side toward the rear end side. Taper bar diameter expanding portion and the taper bar widening portion The outer surface of section to the rear end portion and having a tapered bar Subomi portion gradually reduced in diameter in a concave shape.

  Further, in the water flow cone body incorporating the rectifier of the present invention, the cone body constricted portion and the tapered bar constricted portion are preferably curved.

  According to the water flow cone body of the present invention, the inside of the water flow cone body can be divided along the axial direction by the taper bar and the guide vane in the rectifier, so that the water flow cone body passes through the inside of the water flow cone body. Suction water is less likely to collide and vortex generation of suction water can be suppressed. Thereby, the flow of the suction water inside the water flow cone body is accelerated, and the loss of hydraulic energy can be suppressed inside the water flow cone body. As a result, it is possible to improve the utilization efficiency of hydraulic energy of a device (for example, an underwater power generation device or a pumping pump device) provided with a water flow cone body.

  Further, since the diameter of the front end portion of the water flow cone body of the present invention is smaller than the diameter of the rear end portion, water can be fed from the front end side having a smaller diameter toward the rear end side having a larger diameter, and the well-known Bernoulli By this theorem, a high-speed water flow can be obtained near the tip. Therefore, it contributes to the improvement of the utilization efficiency of the hydraulic energy of the apparatus provided with the water flow cone body.

  Further, the water flow cone body of the present invention has an outer surface and an inner surface, the outer surface and the inner surface extending from the front end side to the rear end side in a tapered shape, and the outer surface and the inner surface from the cone body expanded portion to the rear end portion. A cone-squeezing portion that gradually decreases in diameter without becoming concave, and the taper bar of the rectifying device has a taper bar widening portion whose outer surface expands in a tapered shape from the front end side toward the rear end side; Since the taper bar constriction part whose outer surface gradually decreases in a concave shape from the tapered bar enlarged diameter part to the rear end part, the suction water flowing inside the rear end side of the water cone body becomes high pressure, and the water cone body Outside the rear end side, the flowing water is at a low pressure. Therefore, a large pressure difference is generated between the inside and outside of the rear end portion of the water flow cone body, and the suction water inside the water flow cone body is easily sucked into the water flow outside the water flow cone body by this pressure difference. As a result, the amount of water discharged from the rear end portion of the water flow cone body is increased, which contributes to the improvement of the utilization efficiency of the hydraulic energy of the device provided with the water flow cone body.

  Further, the water flow cone body incorporating the rectifying device of the present invention has a curved flow at the cone body constricted portion and the tapered bar constricted portion, so that the flow of fluid becomes smooth, and the pressure difference at the rear end portion of the water flow cone body. The water inside the water flow cone body is easily sucked into the water outside the water flow cone body. As a result, the amount of water released from the rear end portion of the water flow cone body can be easily increased, which contributes to the improvement of the utilization efficiency of the hydraulic energy of the device provided with the water flow cone body.

It is a front view which shows the 1st Embodiment of this invention. It is a top view of FIG. It is an expanded sectional view of the cone body shown in FIG. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is sectional drawing which shows the 2nd Embodiment of this invention. FIG. 6 is a sectional view taken along line B-B in FIG. 5.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an underwater power generation apparatus G including a water flow cone body 1 with a built-in rectifier 2 as a first embodiment of the present invention. As shown in FIG. 2, the underwater power generation apparatus G includes four water flow cone bodies 1 having a rectifying device 2 connected side by side by a merge pipe 6 (in the river width direction), and is connected to the merge pipe 6. A casing 7, a suction water strainer 8 connected to the casing 7, an underwater generator 11 disposed inside the suction water strainer 8, and attached to the underwater generator 11 to protrude into the casing 7. The propeller turbine 9 and the power transmission cord 12 that transmits power from the underwater generator 11 constitute a main part. The underwater power generation apparatus G is installed on a shallow riverbed R (see FIG. 1) through an installation column 13 (see FIG. 1).

  1 to 3 indicate flowing water flowing outside the underwater power generation apparatus G including the outside of each water flow cone body 1, and the arrow 4 is sucked from the suction water strainer 8 and passes through the propeller turbine 9. The suction water passing through the inside of each water flow cone body 1 is shown, and reference numeral 5 in the figure (see FIG. 1) denotes the water flow surface.

  FIG. 3 shows an enlarged view of the water flow cone body 1. This water flow cone body 1 has a cylindrical shape formed in a conical shape, and the water flow cone body 1 has a funnel shape narrowed on the front end side (left side in the figure), and the diameter of the front end portion 1c is larger than that of the rear end portion 1d. Is also small. Further, the water flow cone body 1 has an outer surface 1a and an inner surface 1b whose diameter increases in a tapered shape from the front end side toward the rear end side, and an outer surface from the cone body enlarged diameter portion 10a to the rear end portion 1d. 1a and the inner surface 1b have a cone-constricted portion 10b that gradually decreases in diameter into a smooth arc shape (curved shape) that is not concave. A rectifying device 2 extending in the axial direction of the water flow cone body 1 is disposed inside the water flow cone body 1. The material of the water flow cone body 1 is not particularly limited as long as it has rigidity capable of withstanding the water pressure flowing inside, and can be formed of a metal such as iron, for example. In addition, the AA sectional view taken on the line of the water flow cone body 1 shown in FIG. 3 is shown in FIG.

  As shown in FIG. 3, the rectifying device 2 has a bar shape in which the front end side and the rear end side are narrowed and the radial dimensions of the front end portion 2c and the rear end portion 2d are substantially the same, and extends along the axial direction. The taper bar 2a includes four guide vanes 2b that are formed on the taper bar 2a so as to extend in the axial direction and are arranged on the taper bar 2a at intervals of 90 ° in the circumferential direction. The taper bar 2a is a portion where the outer surface 20c is located slightly on the distal end side from the axial start end 10c of the cone constricted portion 10b from the distal end side (hereinafter referred to as the axial start end 20d of the tapered bar constricted portion 20b). Toward the rear end toward the rear end, the tapered bar enlarged portion 20a and the outer surface 20c from the tapered bar enlarged portion 20a to the rear end 2d are gradually reduced in diameter into a smooth concave arch shape (curved shape). And a tapered bar constricted portion 20b. The taper angle of the tapered bar enlarged portion 20a is such that the width of the suction water 4 passage between the outer surface 20c of the tapered bar enlarged portion 20a and the inner surface 1b of the water flow cone body 1 increases from the front end side toward the rear end side. The guide vane 2b is provided in the axial direction area | region of the taper bar enlarged diameter part 20a.

  The rectifier 2 is fixed inside the water cone 1 by pushing the rectifier 2 from the front end 1c of the water cone 1 starting from the rear end 2d. Therefore, the guide vane 5 is formed according to the width of the passage for suction water 4 so as to be in close contact with the inner surface 1b of the water flow cone body 1 in the axial direction, and has a radial dimension from the front end side toward the rear end side. It is getting bigger. The rectifying device 2 is not particularly limited as long as it has rigidity capable of withstanding the water pressure of the suction water 4 flowing inside the water flow cone body 1, and can be formed of, for example, iron or plastic. is there.

  In the case of this embodiment, since the rectifier 2 is arranged inside the water flow cone body 1, the taper bar 2a and the four guide vanes 2b of the flow rectifier 2 circulate the space inside the water flow cone body in the circumferential direction, and , And the taper angle of the water flow cone body 1 can be reduced. As a result, the underwater power generator G is activated and the suction water 4 sucked from the suction water strainer 8 is less likely to collide with the inner surface 1b of the water flow cone body 1 and the generation of vortex is suppressed. Thereby, the flow of the suction water 4 inside the water flow cone body 1 is accelerated, and the loss of hydraulic energy can be suppressed inside the water flow cone body 1. As a result, the utilization efficiency of hydraulic energy of the underwater power generation apparatus G can be improved.

  The flowing water 3 flowing along the outer surface 1a of each water flow cone body 1 becomes a low-pressure water flow due to the well-known Coanda effect when it reaches the axial start end 10c of the cone-constricted portion 10b and bends (arrow L1 in the figure). As it is, it flows by inertia along the outer surface 1a of the cone constricted portion 10b as it is. Therefore, when the underwater power generation device G is activated and water is sucked from the suction water strainer 8, the suction water 4 flowing between the inner surface 1b of the water flow cone body 1 and the outer surface 20c of the rectifier 2 is tapered bar 2a. Is sucked to the rear end 2d side and discharged to the outside of each water flow cone body 1.

  On the other hand, in the suction water 4, when the suction water 4 flowing along the inner surface 1b of the water flow cone body 1 reaches the axial start end 10c of the cone body constricted portion 10b and bends, the well-known streamline curvature theorem. To produce a high-pressure water stream (indicated by arrow H1 in the figure). Further, in the suction water 4, when the suction water 4 flowing on the outer surface 20c side of the taper bar 2a of the rectifier 2 reaches the axial start end 20d of the taper bar constricted portion 20b and bends, a well-known streamline curvature is obtained. According to the theorem, a high-pressure water flow is obtained (indicated by an arrow H2 in the figure). The high-pressure water flow indicated by the arrow H2 merges with the high-pressure water flow indicated by the arrow H1 (suction water 4 flowing along the inner surface 1b of the water flow cone body 1).

  As a result, on the rear end side of the water flow cone body 1, a pressure difference is generated between the flow water 3 flowing outside the water flow cone body 1 and the suction water 4 flowing inside, so that the high pressure suction water 4 becomes the low pressure flow water 3. It becomes easy to be sucked and easily discharged from the rear end 1d of the water flow cone body 1. Therefore, compared with the case where the rectifier 2 according to the present embodiment is not disposed in the water flow cone body 1, the amount of water discharged from the rear end 1d of the water flow cone body 1 is increased, and the hydraulic energy of the underwater power generation apparatus G is increased. This greatly contributes to the improvement of usage efficiency.

  Further, the cone body constricted portion 10b of the water flow cone body 1 has an outer surface 1a and an inner surface 1b formed in an arc shape, and the taper bar constricted portion 20b of the taper bar 2a of the rectifier 2 is formed in a concave arch shape. The flow of the flowing water 3 and the suction water 4 becomes smooth, and it becomes easy to generate a pressure difference between the flowing water 3 and the suction water 4 at the rear end portion 1d of the water flow cone body 1. 4 is easily sucked into the flowing water 3 outside the flowing cone body 1. As a result, the amount of water discharged from the rear end 1d of the water flow cone body 1 is likely to increase, which contributes to an improvement in the utilization efficiency of the hydraulic energy of the device provided with the water flow cone body 1.

  Further, since the suction water 4 is discharged from the tip portion 1c having a small diameter toward the rear end portion 1d having a large diameter, a high-speed water flow can be obtained in the vicinity of the tip portion 1c by the well-known Bernoulli theorem. . Therefore, it contributes to the improvement of the utilization efficiency of the hydroelectric energy of the underwater power generation apparatus G.

  As described above, the water flow cone body 1 of the present embodiment has a conical cylindrical shape with a narrowed tip side, and the suction water 4 has a high speed on the tip side, and is sucked by the taper bar 2a and the guide vane 2b of the rectifier 2. The generation of the vortex of the water 4 is prevented, and the pressure of the suction water 4 is increased at the rear end side of the water flow cone body 1 by the cone constriction portion 10b of the water flow cone body 1 and the tapered bar constriction portion 20b of the rectifier 2. By increasing the discharge amount of the suction water 4 from the rear end 1d of the water flow cone body 1 by reducing the pressure of the flowing water 3, the utilization efficiency of the hydraulic energy of the underwater power generator G can be greatly improved. .

  Furthermore, in this embodiment, the high-speed water flow obtained from each water flow cone body 1 is merged by the merge pipe 6, so that the propeller turbine 9 and the underwater power generator 11 are driven and generated by the doubled hydraulic power, respectively. Can be made. Furthermore, in this embodiment, the hydraulic energy by running water, such as a river, can be utilized lightly and it can respond to the problem to a natural environment.

  In the present embodiment, in the water flow cone body 1, the axial length of the cone body enlarged diameter portion 10a is set to about three times the length of the cone body constricted portion 10b. The length of the diameter portion 20a is about 2.5 times the length of the tapered bar constricted portion 20b. However, if the purpose of increasing the discharge amount of the suction water 4 from the rear end portion 1d of the water flow cone body 1 can be achieved, the lengths of the cone body enlarged diameter portion 10a and the cone body constriction portion 10b of the water flow cone body 1 can be achieved. The lengths of the tapered bar enlarged diameter portion 20a and the tapered bar narrowed portion 20b of the rectifying device 2 are not particularly limited.

  Moreover, in this embodiment, although the four water flow cone bodies 1 are used, according to arrangement | positioning space and a use, 1 or 2 or 5 or more can be changed suitably.

  As a second embodiment of the present invention, FIG. 5 shows an underwater power generation apparatus G1 including a water flow cone body 1 in which a rectifying device 2 is built. In the present embodiment, components having the same parts and functions as those of the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted. Only the effect will be described.

  In the present embodiment, the water flow cone body 1 is applied to a float underwater power generation device G1 instead of the riverbed fixed underwater power generation device G shown in the first embodiment of FIG. The water flow cone body 1 is the same as the water flow cone body 1 of the first embodiment shown in FIG.

  Unlike the first embodiment shown in FIG. 1, the underwater power generation apparatus G <b> 1 has one water flow cone body 1, and a casing 17 connected to the water flow cone body 1 and a casing 17. The suction water strainer 18, the underwater power generator 15 disposed inside the suction water strainer 18, the propeller turbine 19 attached to the underwater power generator 15 and projecting into the casing 17, and the underwater power generator The main part is composed of a power transmission cord 25 that transmits power from 15. This underwater power generation apparatus G1 is attached to the float 23 via a support plate 24, and is moored in a diving state on the deep riverbed R using a mooring rope 21 and an anchor block 22.

  In addition, in this embodiment, although the water flow cone body 1 is made into one, two or more can also be used. Further, the present invention is not limited to the forms of the underwater power generation apparatuses G and G1 mentioned here, but may be other forms of underwater power generation apparatuses, and is not limited to the underwater power generation apparatuses, and can be applied to a pumping pump apparatus or the like. It is.

DESCRIPTION OF SYMBOLS 1 Water flow cone body 1a Outer surface 1b Inner surface 1c End part 1d Rear end part 2 Rectifier 2a Taper bar 2b Guide vane 2c Front end part 2d Rear end part 3 Flowing water 4 Suction water 5 Flowing surface 6 Combined pipes 7, 17 Casings 8, 18 Strainer for suction water 9, 19 Propeller turbine 10a Cone body enlarged portion 10b Cone body constricted portion 10c Axial starting end 11, 15 Underwater generator 12, 25 Power transmission cord 13 Installation column 20a Tapered bar Widened portion 20b Tapered bar constricted portion 20c Outer surface 20d Axial starting end 21 of taper bar constricted portion 21 Mooring rope 22 Anchor block 23 Float 24 Support plate G, G1 Underwater power generation device R Riverbed

Claims (2)

It has a cylindrical shape, and includes a water flow cone body for supplying water from the front end side to the rear end side, and a rectifier arranged inside the water flow cone body,
The water cone body has a cone body diameter-enlarged portion in which the diameter of the front end portion is smaller than the diameter of the rear end portion, and the outer surface and the inner surface increase in a taper shape from the front end side toward the rear end side;
A cone-constricted portion that gradually decreases in diameter from the cone-diameter enlarged portion to the rear end portion without being concave on the outer surface and the inner surface;
The rectifier is
A tapered bar extending along the axial direction of the water cone body, and a guide vane formed on the tapered bar so as to extend in the axial direction,
The taper bar is
A taper bar diameter-expanding portion whose outer surface expands in a tapered shape from the tip side toward the rear end side;
A water flow cone body with a built-in rectifier, comprising: a tapered bar constricted portion whose outer surface gradually decreases in a concave shape from the tapered bar enlarged diameter portion to the rear end portion.   The water cone according to claim 1, wherein the cone constricted portion and the tapered bar constricted portion are curved.

Images