JP2014041082A - Wave-making device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wave-making device capable of improving accuracy of waves without the need for water-proofing of a motor.SOLUTION: The wave-making device includes: a water tank 2 having a water reservoir 21 and a water channel 22; a partition plate 3 for separating the water tank 2 into the water reservoir 21 and the water channel 22; and water flow generation means 4 for generating a wave by generating a water flow from the water reservoir 21 toward the water channel 22. The water flow generation means 4 includes: a pipe conduit 41 disposed in the water reservoir 21 which has one end connected to an opening 31 formed on the partition plate 3 and the other end opened toward the bottom of the water reservoir 21; a drive motor 42 disposed outside the water reservoir 21; a propeller 43 disposed within the other end side of the pipe conduit 41 so that a rotary surface faces downward; and a drive shaft 44 which penetrates an upper part of the pipe conduit 41 and connects the drive motor 42 and the propeller 43.

Description

  The present invention relates to a wave making device that artificially generates waves, and more particularly to a wave making device that can generate long-period waves.

  In order to study the stability of floating structures and land structures against tsunamis and other long-period waves, and the impact on topography, experimental devices such as flaps, dam breaks, floats, pneumatics, and water flow are used. Already developed. For example, the flap type experimental device is a device that generates waves by moving the plate back and forth, and the dam break type experimental device is a device that generates waves by discharging the accumulated water, and a float type experimental device. Is a device that generates waves by vibrating the float up and down.The pneumatic experimental device is a device that generates waves by changing the air pressure applied to the water surface. Is a device that generates waves by generating.

  Here, the tsunami experiment apparatus described in Patent Document 1 relates to a water flow type experiment apparatus, and is provided in the water tank so as to divide the water tank into a water storage tank and an experimental tank. A partition plate, and a pump that is provided on the partition plate and causes a tsunami in the water tank, and by generating a water stream that moves the water in the reservoir to the experimental tank by operating the pump. A tsunami is generated in the experimental tank.

JP 2002-332621 A

  In the tsunami experiment apparatus described in Patent Document 1 described above, it is possible to generate a sine wave with a long period by controlling the rotation speed of the pump, but it is necessary to arrange a motor for driving the pump in water. For this reason, the motor must be waterproofed, resulting in a complicated structure. Also, when the motor is placed on the water surface in order to make the motor water-proof, the shaft must be connected to transmit power to the pump, resulting in a complicated structure. It was.

  In addition, a motor and a drive shaft must be arranged on the upstream side (that is, the reservoir side) in the direction of generating waves, which obstructs the pump when sucking water, and the water flow is not stabilized. There was a problem that the accuracy of the deteriorated. Furthermore, since the propeller drive shaft is arranged in the horizontal direction, the water pressure is different in the vertical direction of the propeller, and it is not possible to generate a water flow with a uniform pressure from the pump, and the accuracy of the wave is deteriorated. There was a problem.

  The present invention has been devised in view of the above-described problems, and an object of the present invention is to provide a wave making device that does not require a motor to be waterproofed and can improve the accuracy of waves.

  According to the present invention, a water tank having a water tank and a water channel, a partition plate that divides the water tank into the water tank and the water channel, and generating a water flow from the water tank toward the water channel to generate waves. A water flow generating means, wherein the water flow generating means has one end connected to an opening formed in the partition plate and the other end opened toward the bottom of the water storage tank. A pipe line arranged inside, a drive motor arranged outside the water tank, a propeller arranged inside the other end side of the pipe line so that a rotation surface faces downward, and the pipe line And a drive shaft that connects the drive motor and the propeller.

  The rotating surface may be arranged so as to be parallel to the horizontal plane, or may be inclined within a range of 0 to 45 degrees with respect to the horizontal plane. Further, the drive motor may be connected to a support member that is stretched over an upper portion of the water storage tank. Moreover, the said pipe line may have a flexible part formed in the said one end side. A plurality of the water flow generating means may be arranged in the width direction of the partition plate.

  According to the wave generator of the present invention described above, by controlling the rotation speed of the propeller, it is possible to generate a long-cycle sine wave and to dispose the drive motor outside the water storage tank. Further, it is not necessary to waterproof the drive motor, and the complexity of the structure can be suppressed. In addition, when the drive motor is arranged on the top of the propeller, the drive shaft can be connected to the propeller without connecting the drive shaft, and the structure can be prevented from becoming complicated.

  In addition, by connecting the drive shaft from the top to the propeller placed in the pipeline, there is no obstruction upstream of the propeller when the water flow is generated from the water reservoir toward the water channel. The water flow to be sucked can be stabilized, and the wave accuracy can be improved.

  Furthermore, by disposing the propeller rotation surface downward, the water pressure applied to each blade of the propeller can be made substantially uniform, a water flow with a substantially uniform pressure can be generated, and the accuracy of the wave can be improved. Can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows the wave making apparatus which concerns on 1st embodiment of this invention, (a) is a top view, (b) has shown sectional drawing. It is an expanded sectional view of the water flow generation means shown in FIG. 1, (a) shows at the time of suction, and (b) shows at the time of water flow generation. It is an expanded sectional view which shows the modification of the pipe line shown in FIG. 1, (a) has shown the 1st modification, (b) has shown the 2nd modification. It is an expanded sectional view which shows the water flow generation | occurrence | production means of the wave making apparatus which concerns on 2nd embodiment of this invention, (a) shows the time of propeller position or attitude | position adjustment, (b) shows the time of water flow height adjustment. Yes. It is an expanded sectional view showing the water flow generating means of the wave making device concerning a third embodiment of the present invention, (a) shows the 1st example and (b) shows the 2nd example.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is an overall configuration diagram showing the wave making device according to the first embodiment of the present invention, wherein (a) is a plan view and (b) is a cross-sectional view. FIG. 2 is an enlarged cross-sectional view of the water flow generating means shown in FIG. 1, wherein (a) shows a suction time and (b) shows a water flow generation.

  The wave making device 1 according to the first embodiment of the present invention includes a water tank 2 having a water tank 21 and a water channel 22, a partition plate 3 that divides the water tank 2 into a water tank 21 and a water channel 22, and a water channel from the water tank 21. The water flow generating means 4 generates a water flow toward the water 22 and generates waves, and the water flow generating means 4 has one end connected to the opening 31 formed in the partition plate 3 and the other end stored in the water storage tank 21. A pipe 41 arranged in the water storage tank 21 so as to open toward the bottom of the water tank, a drive motor 42 arranged outside the water storage tank 21, and a rotating surface facing downward inside the other end of the pipe 41 And a drive shaft 44 that passes through the upper portion of the pipe 41 and connects the drive motor 42 and the propeller 43.

  The water tank 2 has a rectangular parallelepiped shape with an open top, and is divided into a water storage tank 21 and a water channel 22 by the partition plate 3. The water tank 21 and the water channel 22 are poured with water necessary for generating waves. The water storage tank 21 is a part that stores water that generates a water flow, and has a shorter length than the water channel 22. The water channel 22 is a portion that generates a wave, and has a sufficient length to generate a long-period wave such as a tsunami. The ratio of the length of the water storage tank 21 and the water channel 22 is set according to conditions such as the magnitude of the wave to be generated, the number of necessary wave cycles, and the water flow necessary to generate the target wave. In addition, in FIG. 1 (a) and (b), the state which abbreviate | omitted a part of water channel 22 is illustrated.

  A model 23 simulating land, a quay, a port facility, and the like is disposed at the end of the water channel 22 opposite to the water storage tank 21. The model 23 is appropriately changed according to the use of the experiment. For example, the model 23 has a floating structure (including a ship), a ground facility such as a tank or a building, a breakwater, a wind power generation facility, or the like. It may be.

  The partition plate 3 is a plate material arranged across the width direction of the water tank 2, and divides the water tank 2 into a water storage tank 21 and a water channel 22. The partition plate 3 is impermeable and configured to withstand the water pressure from the water storage tank 21 and the water channel 22. Moreover, it is preferable to seal the contact point between the water tank 2 and the partition plate 3. Moreover, the partition plate 3 has a height such that water does not overflow from the water storage tank 21 or the water channel 22. In addition, the partition plate 3 is not limited to a flat plate, It may be curved and may have a level | step difference.

  Moreover, the partition plate 3 has an opening 31 for connecting a pipeline 41 that supplies water from the water storage tank 21 toward the water channel 22. A plurality of openings 31 are formed in the width direction of the water tank 2 by the same number as the number of water flows generated from the water storage tank 21 toward the water channel 22 while being formed at a height to be submerged. Note that the openings 31 may be formed at the same height or at different heights depending on the characteristics of the wave to be generated.

  The water flow generation unit 4 is a unit that generates a water flow from the water storage tank 21 toward the water channel 22 and generates a target wave in the water channel 22. The water flow generating means 4 has a pump composed of a drive motor 42, a propeller 43, and a drive shaft 44, and has a pipeline 41 that rectifies the water flow. The drive motor 42 is connected to a control device (not shown) and is configured to be able to control the rotation speed and drive time. By controlling the drive motor 42, the rotation speed and drive time of the propeller 43 can be controlled, and a desired long-cycle sine wave can be generated.

  As shown in FIGS. 1B and 2, the pipe 41 is constituted by an elbow pipe having an opening angle of about 90 degrees, for example. Since the pipe 41 is a component that ejects water sucked from the propeller 43 to the water path 22, it is preferable that the pipe 41 be smoothly curved in order to reduce pressure loss. In addition, the opening angle of the pipe line 41 is adjusted within a range of 45 degrees to 90 degrees, for example, and is preferably set to 90 degrees.

  One end of the pipe 41 is connected to the opening 31 of the partition plate 3 from the water storage tank 21 side, and the contact point with the partition plate 3 is sealed. Further, although not shown, a reinforcing material for stabilizing the pipeline 41 may be connected to the outer periphery of the connecting portion between the pipeline 41 and the partition plate 3. The pipe 41 is connected so as to eject water in a direction perpendicular to the partition plate 3, that is, to generate a water flow in the length direction of the water path 22. However, the pipe 41 may be connected so as to generate a water flow upward or downward in the length direction of the water channel 22 according to the characteristics of the wave to be generated.

  The other end of the conduit 41 is a free end and is open toward the bottom 21 a of the water storage tank 21. Specifically, since the pipe line 41 is constituted by an elbow pipe having an opening angle of about 90 degrees, the other end of the pipe line 41 is disposed in a downward direction, and the water tank 21 It arrange | positions so that it may face the bottom part 21a.

  Further, as shown in FIG. 2B, the other end of the pipe 41 is disposed at a position having a certain distance D from the bottom 21 a of the water storage tank 21. The interval D is set so that water can be efficiently sucked when a water flow is generated because the pipe 41 forms a flow path for sucking water in the water storage tank 21 and ejecting the water into the water path 22.

  Here, FIG. 3 is an enlarged cross-sectional view showing a modified example of the pipe line shown in FIG. 1, wherein (a) shows a first modified example and (b) shows a second modified example. In the first modification shown in FIG. 3A, a straight portion 41 a is formed on one end side of the pipe line 41 (on the connection portion side with the partition plate 3). By forming the straight portion 41 a in the pipe 41, the water flow generated toward the water channel 22 can be sufficiently rectified.

  In the second modification shown in FIG. 3B, the enlarged diameter portion 41 b is formed on the other end side of the pipe line 41. The enlarged diameter portion 41b has a trumpet shape whose diameter is gradually increased outward. By connecting the enlarged diameter portion 41b to the distal end portion of the pipe line 41, water in the water storage tank 21 can be easily sucked.

  Further, a propeller 43 is disposed on the other end side of the conduit 41 so as to face downward. For example, the propeller 43 is disposed such that the rotation surface is parallel to the horizontal plane. In this way, by arranging the rotation surface of the propeller 43 downward, each blade of the propeller 43 is arranged at substantially the same water depth, so that the water pressure applied to each blade of the propeller 43 can be made substantially uniform, A water flow having a substantially uniform pressure can be generated, and the wave accuracy can be improved. Note that the rotation surface of the propeller 43 does not always have to be horizontal, and is inclined within a range of 0 to 45 degrees with respect to the horizontal plane, for example, depending on the water depth of the propeller 43, conditions of waves to be generated, and the like. Also good. That is, “the propeller 43 faces downward” means that the rotation surface of the propeller 43 is inclined within a range of 0 to 45 degrees with respect to the horizontal plane.

  A drive shaft 44 that transmits power is coupled to the propeller 43 from above. Specifically, the drive shaft 44 extends in the vertical direction from the drive motor 42, passes through the upper portion of the conduit 41, is inserted into the conduit 41, and is connected to the propeller 43. As shown in FIG. 2, a seal member 44 a is disposed in the penetrating portion of the pipe line 41. Although the detailed illustration is omitted, the drive shaft 44 includes, for example, an outer cylinder disposed between the drive motor 42 and the propeller 43, and a shaft that is rotatably inserted into the outer cylinder. Is done.

  The drive motor 42 is disposed above the propeller 43 and is directly connected to a drive shaft 44 that is not shaft-joined. Further, as shown in FIGS. 1A and 1B, the drive motor 42 is connected to the support member 45 spanned on the upper part of the water storage tank 21, and is separated from the water surface of the water storage tank 21. Is arranged. Thus, by disposing the drive motor 42 outside the water storage tank 21, it is not necessary to waterproof the drive motor 42. Further, since the drive motor 42 is disposed on the top of the propeller 43, it is not necessary to joint the drive shaft 44. Therefore, complication of the structure of the water flow generating means 4 can be suppressed.

  The power transmission structure from the drive motor 42 to the propeller 43 is not limited to that shown in the figure. When the drive motor 42 cannot be disposed on the top of the propeller 43, the drive shaft 44 is connected by connecting the shafts. You may make it do.

  The support member 45 is, for example, an I-shaped or U-shaped structure made of steel and is mounted or fixed on the edge of the water tank 2. The support member 45 may be configured to be able to move on the rail 24 disposed on the upper surface of the edge of the water tank 2 in the length direction. The moving means of the support member 45 is not shown, but may be self-propelled or towed. In addition, the support member 45 may be connected to the pillar member arrange | positioned on the outer side of the water tank 2, and may be connected to the ceiling part of the building.

  A plurality of the water flow generating means 4 (the pipe 41, the drive motor 42, the propeller 43, and the drive shaft 44) are arranged in the width direction of the partition plate 3 as shown in FIG. In this way, by arranging a plurality of water flow generating means 4 in the width direction of the water tank 2, it is possible to suppress variations in the pressure of the water flow in the width direction of the water tank 2, and waves having a certain width necessary for the experiment. Can be effectively generated. In addition, although the case where the four water flow generation means 4 are arrange | positioned at equal intervals is shown here, it is not limited to this structure, Conditions, such as the magnitude | size of the width | variety of the water tank 2, the capacity | capacitance of a pump, etc. Depending on the number, it may be three or less, or five or more.

  In order to generate a water flow from the water storage tank 21 toward the water channel 22 by the water flow generating means 4 described above, first, as shown in FIG. 2 (a), the propeller 43 is rotated so that the water in the water channel 22 is discharged. It is drawn into the water storage tank 21. Thereafter, as shown in FIG. 2B, the propeller 43 is reversed and the water in the water storage tank 21 is ejected toward the water channel 22. At this time, by controlling the rotation speed and driving time of the propeller 43, it is possible to generate a sine wave having an arbitrary long period as shown by a one-dot chain line in FIG.

  Further, after the experiment is completed, the propeller 43 may be inverted again to collect the water supplied to the water channel 22 in the water storage tank 21. In addition, when the water quantity of water sufficient to generate the target wave in the water storage tank 21 is stored in advance, the suction process illustrated in FIG. 2A may be omitted.

  Next, a wave making device 1 according to a second embodiment of the present invention will be described with reference to FIG. Here, FIG. 4 is an enlarged cross-sectional view showing the water flow generating means of the wave making device according to the second embodiment of the present invention, (a) when adjusting the position or posture of the propeller, (b) is the height of the water flow. It is shown during the adjustment. In addition, about the same component as the wave making apparatus 1 which concerns on 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The wave making device 1 according to the second embodiment shown in FIGS. 4A and 4B has a flexible portion 41c in which a pipe line 41 is formed on one end side. The flexible portion 41c is configured by, for example, a bellows, but is not limited to such a configuration, and may be configured by an elastic body such as piping or rubber having a lower rigidity than the conduit 41. By forming the flexible part 41c in the pipe line 41, the position and posture of the propeller 43 can be easily adjusted, and the height of the water flow can be adjusted.

  As shown in FIG. 4 (a), if the height of the center line L of the water flow generated in the water channel 22 is H, the height H of the water flow is maintained, that is, one end of the pipe 41 is partitioned. The position and posture of the propeller 43 can be adjusted while being connected to the plate 3. As shown in the figure, if the length direction of the water tank 2 is the X axis, the width direction is the Y axis, and the depth direction is the Z axis, the propeller 43 and the bottom of the water tank 21 are moved by moving the propeller 43 in the Z axis direction. The distance D between the propeller 43 and the partition plate 3 can be adjusted by moving the propeller 43 in the X-axis direction, and the propeller 43 is rotated about the Y-axis. Thus, the inclination angle θ in the X-axis direction between the drive shaft 44 and the bottom portion 21a of the water storage tank 21 can be adjusted.

  Although not shown, the tilt angle in the Y-axis direction between the drive shaft 44 and the bottom 21a of the water storage tank 21 can be adjusted by rotating the propeller 43 about the X-axis, and the propeller 43 can be adjusted in the Y-axis direction. By moving, the distance between the propeller 43 and the wall surface of the water storage tank 21 and the interval between the adjacent propellers 43 can be adjusted.

  Therefore, when the water flow generating means 4 is installed, the displacement of the water flow generating means 4 can be corrected with the pipe line 41 connected to the opening 31 of the partition plate 3, and the water flow generating means 4 is placed at an appropriate position. Can be installed. Further, the position and posture of the propeller 43 can be adjusted according to the conditions of the wave to be generated, and the water flow generating means 4 having a configuration suitable for the target wave can be easily installed.

  As described above, when the position and orientation of the propeller 43 are desired to be adjusted, for example, the drive motor 42 may be connected to the support member 45 so as to be able to move up and down, rotate, or move left and right. Further, when the propeller 43 is moved in the X-axis direction, the support member 45 may be moved on the water tank 2.

  Further, as shown in FIG. 4B, the height of the opening 31 is maintained while maintaining the distance D between the propeller 43 and the bottom 21a of the water tank 21, that is, with the position and posture of the propeller 43 being fixed. The height H of the water flow can be adjusted by replacing the partition plate 3 with a different one. Therefore, the height H of the water flow can be easily changed according to the conditions of the wave to be generated, and the water flow generating means 4 having a configuration suitable for the target wave can be easily installed.

  Next, a wave making device 1 according to a third embodiment of the present invention will be described with reference to FIG. Here, FIG. 5 is an enlarged cross-sectional view showing the water flow generating means of the wave making device according to the third embodiment of the present invention, where (a) shows a first example and (b) shows a second example. Yes. In addition, about the same component as the wave making apparatus 1 which concerns on 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In the third embodiment shown in FIGS. 5A and 5B, the rotation surface of the propeller 43 is inclined within a range of 0 to 45 degrees with respect to the horizontal plane. The direction in which the rotation surface of the propeller 43 is inclined is not limited to the direction shown in FIGS. 5A and 5B, and can be inclined in an arbitrary direction.

  The wave making device 1 according to the first example of the third embodiment shown in FIG. 5A is configured to rotate the propeller 43 by inclining the drive shaft 44 of the propeller 43 toward the water channel 22 by an angle φ in the XZ plane. The surface is inclined. At this time, since the drive shaft 44 and the partition plate 3 interfere with each other, the drive shaft 44 allows the partition plate 3 to pass through the seal member 44b.

  According to such a configuration, the opening surface at the other end of the pipe line 41 can be inclined by an angle φ so as to be substantially parallel to the rotation surface of the propeller 43, and the water in the water storage tank 21 can be easily sucked. it can. Further, by passing the drive shaft 44 through the partition plate 3, a part of the weight of the water flow generation means 4 can be supported by the partition plate 3, and the support member 45 that supports the water flow generation means 4 can be simplified and lightweight. Can also be achieved. In the present embodiment, the same pipe line 41 as that used in the first embodiment may be used.

  The wave making device 1 according to the second example of the third embodiment shown in FIG. 5B is configured by inclining the drive shaft 44 of the propeller 43 by an angle φ ′ in the width direction of the water tank 2 in the YZ plane. The rotating surface of 43 is inclined. Here, the case of tilting to the right side of the figure is shown, but it may be tilted to the left side, or the one tilted to the right side and the one tilted to the left side may be mixed. Good.

  According to such a configuration, the drive shaft 44 is disposed at a position close to one side in the pipe 41, so that the space in the center of the pipe 41 can be opened, and the water flow and the drive shaft 44 can be opened. Interference can be reduced. Note that the opening surface at the other end of the conduit 41 may be inclined by an angle φ ′ so as to be substantially parallel to the rotation surface of the propeller 43.

  The present invention is not limited to the above-described embodiments, and the first modification and the second modification in the first embodiment may be applied to the pipe line 41 in the second embodiment, so that the gist of the present invention is not deviated. Of course, various changes can be made within the range.

DESCRIPTION OF SYMBOLS 1 Wave generator 2 Water tank 3 Partition plate 4 Water flow generation means 21 Water storage tank 21a Bottom part 22 Water channel 31 Opening part 41 Pipe line 41c Flexible part 42 Drive motor 43 Propeller 44 Drive shaft 45 Support member

Claims (5)

A water tank having a water storage tank and a water channel, a partition plate that divides the water tank into the water storage tank and the water channel, and water flow generating means for generating a water flow from the water storage tank toward the water channel to generate waves. In the wave generator having
The water flow generating means is
A pipe line disposed in the water reservoir so that one end is connected to an opening formed in the partition plate and the other end is opened toward the bottom of the water reservoir;
A drive motor disposed outside the water tank;
A propeller arranged so that the rotation surface faces downward inside the other end side of the pipe line;
A drive shaft that penetrates the upper part of the conduit and connects the drive motor and the propeller;
A wave making device comprising:   2. The wave making device according to claim 1, wherein the rotating surface is disposed so as to be parallel to a horizontal plane, or is inclined within a range of 0 to 45 degrees with respect to the horizontal plane. .   2. The wave making device according to claim 1, wherein the drive motor is connected to a support member that extends over an upper portion of the water storage tank.   The wave making device according to claim 1, wherein the pipe has a flexible portion formed on the one end side.   The wave making device according to claim 1, wherein a plurality of the water flow generating means are arranged in a width direction of the partition plate.