JPH05340400A - Water current generating device - Google Patents

Abstract

PURPOSE:To provide generation of water currents and aeration effect easily and surely without requiring a special drive device or aeration device by supplying drive fluid including gas to an eductor disposed in an outer cylinder, and generating the water currents by accelerating water liquid in the outer cylinder. CONSTITUTION:A water generating device is used for exchange of water blocks for purifying water quality in a closed water range, for example. In this case, a cylindrical body (nacelle) 18 is disposed concentrically inside the outer cylinder, and an eductor 19 is disposed inside the cylindrical body 18. In the meanwhile, drive fluid at the eductor 19 is supplied from a supply tube 3. At the eductor 19, water in the outer cylinder 2 is sucked from an entrance 21 to be discharged from an exit 20, so water in the outer cylinder 20 is accelerated in the discharge direction. Use of a special drive device or movable part is thus eliminated, and a maintenance-free and high-durability simple structure can be composed. By using gas for the drive fluid as necessary, aeration effect can be provided without using a special aeration device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water flow generator applied to water mass exchange for water purification in a closed water area such as a lake, a pond, a water tank, a pool, a harbor, an aquaculture area.

[0002]

24 and 25 are explanatory views of a conventional water flow generator. In FIG. 24, reference numeral 02
Is an outer cylinder that is held upright by the lift force of the buoyancy member 010, 03 is a compressed air supply pipe, 07 is an air chamber that opens downward, 08 is a mooring line, and 09 is a sinker.
The air layer stored in the air chamber 07 gradually increases,
Finally, large air bubbles are formed inside the outer cylinder 02 beyond the lower end of the air chamber 07. The bubbles are generated intermittently with the supply of compressed air, but as the bubbles rise, the water near the bottom of the water is transferred upward and the action of water mass exchange is performed.

In FIG. 36, reference numeral 02 is an outer cylinder connected to a water flow tunnel, 015 is an electric motor, a drive shaft rotated by another prime mover, 016 is a bevel gear device connected to this drive shaft 015, and 017 is a bevel gear. A shaft driven by the device 015, 014 is an impeller that is driven by the shaft 017 to generate a water flow, and 023 is a strut (column) that fixes and holds the nacelle containing these bevel gear devices 016 and the like.
Is. Further, reference numerals 024 and 025 are a submersible motor and a power supply cable, respectively. These water flow generators are mainly used in ships and the like, and transfer water in arbitrary directions such as vertical and horizontal directions to perform water mass exchange.

[0004]

In the conventional water flow generating device as described above, in the water flow generating device shown in FIG. 24, the water near the bottom of the water is transferred upward as the bubbles rise, and the action of water lump exchange is performed. However, as a general rule, this transfer of water is intermittent and is limited to upward transfer. A horizontal diffusive flow is generated near the water surface, but this is a secondary flow due to the collision of the water transferred upward to the water surface, so the hydraulic power is weak, and to perform horizontal water mass exchange This weak 2
There is no choice but to use the next flow passively.

Further, the water flow generator in FIG. 25 can transfer water in any direction such as vertical direction and horizontal direction to exchange water mass, but with a large-scale and precise drive device including a prime mover, It is practically difficult to install it in water for a long time and use it for water flow generation. Also, aeration is not possible because there is no effective contact with air.

[0006]

SUMMARY OF THE INVENTION A water flow generator according to the present invention is intended to solve the above problems, and an outer cylinder for discharging a water flow generated inside in a predetermined direction and an outer cylinder inside the outer cylinder. An eductor that is mounted and accelerates the water liquid in the outer cylinder by a driving fluid supplied from the outside to generate a water flow.

The water flow generator according to the present invention has the same structure as that of the water flow generator according to the present invention, and has a structure in which the eductor is provided with a gas suction pipe for sucking gas in addition to the driving fluid from the outside. Characterize.

The water flow generator according to the present invention is characterized in that it has the same structure as the water flow generator according to the first aspect of the present invention and that the outer cylinder is provided in a curved shape in a required direction.

Further, the water flow generating device according to the present invention is characterized in that it is constructed in the same manner as the water flow generating device according to the above-mentioned invention and that the outer cylinder is branched to provide outlets in a plurality of directions. ..

[0010]

That is, in the water flow generator according to the present invention,
The eductor mounted in the outer cylinder accelerates the water liquid in the outer cylinder by the driving fluid supplied from the outside to generate a water flow and discharge it in a predetermined direction by the outer cylinder. A strong water flow is generated in an arbitrary direction without using a drive unit having a movable part.

Further, in the water flow generator according to the present invention, the eductor mounted in the outer cylinder accelerates the water liquid in the outer cylinder by the driving fluid supplied from the outside to generate a water flow, and the eductor makes a predetermined flow. In addition to discharging the driving fluid to the eductor from the outside through the gas suction pipe, the aspirating water flow with strong hydraulic power in any direction can be used without using a driving device with moving parts such as a prime mover. To occur.

Further, in the water flow generator according to the present invention, the eductor mounted in the outer cylinder accelerates the water liquid in the outer cylinder by the driving fluid supplied from the outside to generate a water flow, and the eductor makes a predetermined flow. The outer cylinder is provided in a curved shape in the required direction, and a strong water flow is generated in any required direction without using a drive device with a movable part such as a prime mover. ..

Further, in the water flow generator according to the present invention, the eductor mounted in the outer cylinder accelerates the water liquid in the outer cylinder by the driving fluid supplied from the outside to generate a water flow, and the eductor makes a predetermined flow. The outer cylinder is branched and outlets are provided in a plurality of directions while discharging in the direction of
A strong water flow is generated in arbitrary plural directions without using a drive unit having a movable part such as a prime mover.

[0014]

1 to 8 are explanatory views of a water flow generator according to a first embodiment of the present invention. 1 and 2, a water flow generator according to a first embodiment of the present invention is used for water mass exchange for water quality purification in a closed water area, and reference numeral 2 in the drawings denotes a water flow inside the water flow generator. The outer cylinder 18 to be generated is a cylindrical body (nacelle) installed inside the outer cylinder 2 with their central axes aligned. As shown in the figure, an eductor 19 for generating a water flow in a jet type is provided inside the cylindrical body 18.
Is installed, and the driving fluid (air,
Water or a gas-liquid mixed fluid thereof is supplied through the supply pipe 3. As a result, the eductor 19 sucks the water in the outer cylinder 2 from the inlet 21 and discharges the water from the outlet 20 to accelerate the water in the outer cylinder 2 in the discharging direction. 44 is a dust remover, 22 is a support pillar for supporting the cylindrical body 18, 10 is an outer cylinder 2
The buoyancy members fixed to the outer tube 2 and 26 and 27 are the outer tube 2 respectively.
, 28 is an eye plate used for mooring the outer cylinder 2, 9 is a sinker, 8 is a mooring line, and 3a is an outlet of a jet stream of a driving fluid for generating a water stream. By applying such characteristics of the eductor 19, the present water flow generator does not use a large drive device such as a prime mover,
Since there is no moving part, it has a simple structure that is maintenance-free and highly durable, and the outer cylinder 2 can generate a powerful and effective water flow in any direction such as up, down, left and right, and diagonally.
By using or mixing a gas as the driving fluid for the eductor 19 as needed, an effective aeration effect can be achieved without adding an aeration device. Also,
The water flow generated in the outer cylinder 2 does not intermittently collide with the water surface to cause flow loss, and is a calm and steady water flow, so that adverse effects on aquatic organisms are greatly reduced. In addition,
Since this water flow generator can also form a complex underwater structure group consisting of the outer cylinder 2, mooring lines 8, sinkers 9, etc.,
It can exert the effect as a fish reef, and has an indirect protection and a habitatization action for aquatic products as a seawater mass exchange device.

In FIG. 3, the present water flow generator is a water flow generator according to an application example of the first embodiment, and the structure and action and effect thereof are almost the same as those of the water flow generator according to the above-mentioned embodiment. As shown, two eductors 19 for water flow generation are arranged outside the center of the outer cylinder 2 so as to have their respective central axes, and a strong water flow is generated.

In FIG. 4, the present water flow generator is a water flow generator according to a second application example of the first embodiment, and as shown in the figure, the water flow generator according to the above-mentioned embodiment has the same structure, function and effect. Although almost the same, three eductors 19 for generating a water flow are arranged symmetrically with respect to the central axis in the outer cylinder 2 so as to generate a stronger water flow.

In FIG. 5, the present water flow generator is a water flow generator according to a third application example of the first embodiment, and as shown in the drawing, the water flow generator has substantially the same structure, operation and effect as the water flow generator according to the above-mentioned embodiment. Although the same, the drive fluid supply pipe 3b of the eductor 19 for water flow generation is provided inside the outer cylinder 2, and there is no support for supporting the water flow generation cylinder 18 and the like in the outer cylinder 2. The bulge 22b is embedded as a part of the outer cylinder 2 to reduce the resistance to the flow.

In FIG. 6, the present water flow generator is a water flow generator according to the first embodiment as shown in the figure, or is installed near a culture shelf or the like, and is used for water mass exchange in the culture water area. Has been done. In the figure, reference numeral 31 is a float for hanging a cage or aquaculture shelf, 32 is a fish cage, and 33 is a shellfish aquaculture shelf.

In FIG. 7, the present water flow generator is the one in which the water flow generator according to the first embodiment is installed at the bottom of the water in the bay, and is used for water mass exchange in a highly closed water area such as the back of the bay. used. One set of mooring lines 8 and one set of sinkers 9 are provided at both ends of the outer cylinder 2 in the lengthwise direction. When the mooring lines 8 and sinkers 9 are installed on the bottom of the water, the length of the mooring lines is adjusted so that the mooring lines 8 and the sinkers 9 are positioned along the inclined surface of the bottom of the water. It is supposed to be placed in.

In FIG. 8, the present water flow generator is the water flow generator according to the first embodiment installed in the bay as shown in the figure, and the reference numeral 35 in the figure delivers the driving fluid of the eductor for water flow generation. The pump equipments 39 and 40 are the inflow direction and outflow direction of the flow generated in the bay by the present water flow generator. As a result, by arranging seawater that is stagnant in a closed bay, which is difficult to circulate by itself, in a combination of multiple units of this device, a circulating flow is actively generated in the bay to perform water mass exchange. You can

9 to 15 are explanatory views of a water flow generator according to the second embodiment of the present invention. 9 and 10, the water flow generator according to the second embodiment is used for water mass exchange that also serves as aeration for water purification in a closed water area, and the reference numeral 2 in the drawings indicates the water flow inside the water flow. The outer cylinder 18 is a cylinder (nacelle) installed inside the outer cylinder 2 with their central axes aligned with each other. As shown in the figure, the eductor 1 for generating a water flow in a jet type
9 are decorated. The driving water for the eductor 19 is supplied through the supply pipe 3. As a result, the eductor 19 sucks the water in the outer cylinder 2 from the inlet 21 and discharges it from the outlet 20, and accelerates the water in the outer cylinder 2 in the discharging direction. Reference numeral 22 is a column for supporting the tubular body 18, 10 is a buoyant member fixed to the outer tube 2, 26 and 27 are upstream and downstream ends of the outer tube 2, respectively, and 28 is an eye plate used for mooring the outer tube 2. , 9 is a sinker, 8 is a mooring line, 3a is an outlet nozzle of driving water for generating a water flow in the eductor 19, and 29 is an inner pressure of the eductor 19 is below atmospheric pressure,
A gas suction pipe for sucking air from the outside, 30 is an eductor 1
9 is a ventilation line. By applying such characteristics of the eductor 19, the present water flow generator does not use a large-scale drive device such as a prime mover and has a simple structure with no maintenance and high durability because it has no moving parts. By this, a strong and effective water flow can be generated in any direction such as up, down, left and right, and diagonally, and by providing the eductor 19 with a gas suction pipe 29 for sucking air from the outside, it is effective without adding an aerator. The aeration effect can be mentioned. Further, since the water flow generated in the outer cylinder 2 is a calm and steady water flow without intermittently colliding with the water surface and causing a flow loss, adverse effects on aquatic organisms and the like are significantly reduced.

In FIG. 11, the present water flow generator is a water flow generator according to an application example of the second embodiment, which has substantially the same structure and operation effect as the water flow generator according to the above-mentioned embodiment. Vent line 30 in eductor 19 as shown
A water channel member 29b made of a porous material and forming a part of the inner wall of the eductor 19 is attached to the outlet, and a gas compression system 41 is provided at the inlet of the gas suction pipe 29 of the eductor 19.
Is provided. The air compressed or pressure-stored by the gas compression system 41 to the atmospheric pressure or more, or the gas for aeration by a specific gas passes through the gas suction pipe 29 and the ventilation pipe 30, and passes through the water passage member 29b to form a fine gas. Bubbles are sent out to the waterway in the eductor 19.

In FIG. 12, the present water flow generator is a water flow generator according to a second application example of the second embodiment, and has substantially the same structure and operation effect as the water flow generator according to the above-mentioned embodiment. As shown in the figure, five eductors 19 for generating a water flow are arranged in the outer cylinder 2 in the same direction.
It is designed to generate a powerful water stream. Reference numeral 3 in the drawing is a collecting pipe of the driving water supply pipe 3 for driving the eductor 19. A flexible pressure resistant pipe or the like is used for the drive water supply pipe 3 and the gas suction pipe 29, but these are put together using a cable and arranged on the outer circumference of the outer cylinder 2 or inside the outer cylinder 2. Good.

In FIG. 13, the present water flow generator is a water flow generator according to a third application example of the second embodiment and has substantially the same structure, operation and effect as the water flow generator according to the above-mentioned embodiment. As shown in the drawing, the outer cylinder 2 and the buoyancy member 10 are not arranged in an annular shape on the outer circumference of the outer cylinder 2, and
It is mounted along the normal of the outer surface and is designed to generate a large buoyancy.

In FIG. 14, the present water flow generator is a water flow generator according to a fourth application example of the second embodiment, which is substantially the same in structure, operation and effect as the water flow generator according to the above-mentioned embodiment. As shown in the figure, an outer cylinder unit 2a, in which an eductor for generating a water flow is installed, is joined in four stages in series so as to generate a strong water flow and an aeration flow. In the figure, reference numeral 10a is a bulging portion containing a buoyancy material, 34 is a flange for joining the outer cylinder unit 2a,
Reference numeral 35 is a bolt and a nut.

In FIG. 15, the present water flow generator is the water flow generator according to the second embodiment installed from the bottom to the upper side as shown in the figure. The fishing ground can be activated by releasing it into the sea and exchanging water mass.

16 to 19 are explanatory views of a water flow generator according to the third embodiment of the present invention. In FIG.
The water flow generator according to the third embodiment is used for water mass exchange in order to purify water in a closed water area. Reference numeral 2 in the figure is a curved outer cylinder for generating a water flow therein, and 18 is As shown in the figure, a cylindrical body (nacelle) is installed inside the outer cylinder 2 with their central axes aligned with each other, and an eductor 19 for generating a water flow in a jet type is installed inside thereof. The drive fluid (air, water or a gas-liquid mixed fluid of these) for the eductor 19 is supplied through the supply pipe 3. As a result, the eductor 19 sucks the water in the outer cylinder 2 from the inlet 21 and discharges it from the outlet 20, and accelerates the water in the outer cylinder 2 in the discharging direction. 22 is a cylinder 18
Columns 10 that support the buoyancy member fixed to the outer cylinder 2, 26 and 27 are upstream and downstream ends of the outer cylinder 2, and 2 respectively.
8 is an eye plate used for mooring, 9 is a sinker, 8
Is a mooring line. The outer cylinder 2 is set so that the suction flow and the discharge flow are horizontal. By applying such characteristics of the eductor 19, the present water flow generator does not use a large-scale driving device such as a prime mover, has no moving parts, and thus has a simple structure that is maintenance-free and has high durability. The cylinder 2 can generate a powerful and effective water flow in any direction such as up, down, left and right, and diagonally, and an aeration device is added by using a gas as a driving fluid for the eductor 19 or mixing it as necessary. Even without it, effective aeration effect can be obtained. Further, since the water flow generated in the outer cylinder 2 is a calm and steady water flow without intermittently colliding with the water surface and causing a flow loss, adverse effects on aquatic organisms and the like are significantly reduced.

In FIG. 17, the present water flow generator is obtained by placing the water flow generator according to the third embodiment as shown in the figure or installed in a culture water area such as a culture shelf. It is now used for lump exchange. In the figure, reference numeral 31 is a float for hanging a cage or aquaculture shelf, 32 is a fish cage, and 33 is a shellfish aquaculture shelf. The water flow generator generates a steady horizontal flow in the upstream water area 33a and the lower water area 32a of the fish rack 32 or shellfish culture shelf 33, and the flow is generated by the outer cylinder 2
It can be inhaled and transferred horizontally to the upper water area, and the seawater that stagnates on the sea floor can be continuously sent to the upper water area near the water surface without forming sludge on the water bottom.

In FIG. 18, the present water flow generator is the one in which the water flow generator according to the third embodiment is installed on a stepped seabed, and is used for water mass exchange on the seabed. Reference numeral 13a indicates the seabed in a deep water area, and the outer cylinder 2 is curved according to the topography of the seabed so as to meet this application, and the seawater that stagnates in a tongue shape can be moved to the shallow water shelf.

In FIG. 19, the present water flow generator is the water flow generator according to the third embodiment installed in a bay having a strong closing property, and is used for water mass exchange in the bay. Reference numeral 35 in the drawing is a pump facility for supplying a driving fluid to the main stream generator, and the main stream generator moves and circulates the water that stagnates in a strongly closed curve.

20 to 23 are explanatory views of a water flow generator according to a fourth embodiment of the present invention. In FIG. 20,
The water flow generator according to the fourth embodiment is used for water mass exchange in order to purify water in a closed water area. Reference numeral 2 in the drawing denotes an outer cylinder for generating a water flow therein, and 3 denotes an outer cylinder 2. A supply pipe for supplying a driving fluid to an eductor 19 for generating a water flow in a jet manner, 8 is a mooring line, 9 is a sinker,
10 is a buoyant material, 18 is an eductor 19 inside the outer cylinder 2.
26, 27 are the upstream end of the outer cylinder 2 and the downstream end of the sub outer cylinder 2a, 2a is the sub outer cylinder joined to the outer cylinder 2, 2b is the outer cylinder 2 and the sub outer cylinder 2a. , A sub-eductor in the sub-cylindrical body 18a corresponding to the eductor 19 in the tubular body 18, and 10a are sub-buoyancy members. Eductor 1
9, the auxiliary eductor 19a is an outer cylinder 2 and a secondary outer cylinder 2a, respectively.
The water inside is accelerated toward the downstream end 27 side. By applying such characteristics of the eductor 19 and the sub-eductor 19a, the present water flow generator does not use a large-scale drive device such as a prime mover and does not have any moving parts, so that it has a simple structure with high maintenance and durability. The plurality of sub-outer cylinders 2a can generate a strong and effective water flow in any direction such as up, down, left and right, and diagonally, and if necessary, the eductor 19
By using or mixing gas as the driving fluid, the effective aeration effect can be obtained without adding an aeration device. Further, the water flow generated in the outer cylinder 2 is a calm and steady water flow without intermittently colliding with the water surface and causing a flow loss, so that adverse effects on aquatic organisms and the like are significantly reduced.

In FIG. 21, the present water flow generator is a water flow generator according to an application example of the fourth embodiment, and has substantially the same structure and action as the water flow generator according to the fourth embodiment. As shown in FIG. 3, three sub outer cylinders 2a are provided. The sub-outer cylinders 2a are joined to the upper ends of the outer cylinders 2 so as to face each other in the outer horizontal direction, 18a is a sub-cylinder body mounted inside the sub-outer cylinders 2a, and 27 is the sub-outer cylinder 2
The downstream end 10a of a is the outer skin 2 of the buoyancy material or the outer skin of the auxiliary outer cylinder 2a, and the outer skin 10b is also the same outer skin, but the lower end of the collective fixing frame 41 of the auxiliary outer cylinder 2a is fixed. Is a strength member or band. As described above, since the sub-outer cylinder 2a of the present water flow generator is provided in a horizontal direction that divides the outer circumference into three parts, it is possible to inhale the water bottom layer water and disperse it in the horizontal direction in the upper layer water and discharge it. it can.

In FIG. 22, the present water flow generator is a water flow generator according to the second application example of the fourth embodiment, and has substantially the same structure, function and effect as the water flow generator according to the fourth embodiment. As shown in the figure, two outer cylinders 2 are provided so as to face upward two directions, respectively. Reference numeral 28a in the figure
Is a connecting eye plate that connects the two outer cylinders 2 to each other, 28a is a connecting rod that connects these connecting eye plates 28 to each other, and 3b is a collecting pipe of the drive fluid supply pipe 3. In this way, the present water flow generator simplifies the equipment of the buoyancy member 10 and can generate water flows in multiple directions by combining the two outer cylinders 2.

In FIG. 23, the present water flow generator is the water flow generator according to the third application example of the fourth embodiment, and has substantially the same structure, function and effect as the water flow generator according to the fourth embodiment. As shown in the drawing, four outer cylinders 2 are provided so as to face upward four directions. Reference numeral 41 is a frame body that collects and fixes the outer cylinders 2 to which no buoyancy material is attached,
Reference numeral 28b is a metal strip that secures each outer cylinder 2 to the frame 41. In this way, the present water flow generator simplifies the equipment of the buoyancy member 10 and can generate water flows in multiple directions by combining the four outer cylinders 2.

[0035]

The water flow generator according to the present invention is configured as described above, and generates a strong water flow in an arbitrary direction without using a drive device having a movable part such as a prime mover. Even if it is installed for a long period of time, it can be used for water mass exchange without requiring special maintenance.

[Brief description of drawings]

FIG. 1 (a) is a cross-sectional view of a water flow generator according to a first embodiment of the present invention, and FIG. 1 (b) is a view taken along the line bb in FIG. 1 (a).

FIG. 2 is a sectional view of the eductor.

FIG. 3 (a) is a cross-sectional view of a water flow generator according to a first application example of the first embodiment, and FIG. 3 (b) is a bb arrow view in FIG. 3 (a).

FIG. 4 is a front view of a water flow generation device according to a second application example.

FIG. 5 is a cross-sectional view of a water flow generator according to a third application example.

FIG. 6 is an example of use of the water flow generator according to the first embodiment.

FIG. 7 is also an example of use of the water flow generator according to the first embodiment.

FIG. 8 is also a usage example of the water flow generator according to the first embodiment.

FIG. 9 (a) is a cross-sectional view of a water flow generator according to a second embodiment of the present invention, and FIG. 9 (b) is b in FIG. 9 (a).
FIG.

FIG. 10 is a sectional view of the eductor.

FIG. 11 is a cross-sectional view of a water flow generator according to a first application example of the second embodiment.

FIG. 12 (a) is a cross-sectional view of a water flow generator according to a second application example, and FIG. 12 (b) is a bb arrow view in FIG. 12 (a).

13 (a) is a cross-sectional view of a water flow generator according to a third application example, and FIG. 13 (b) is a bb arrow view in FIG. 13 (a).

FIG. 14 is an external view of a water flow generator according to a fourth application example.

FIG. 15 is an example of use of the water flow generator according to the second embodiment.

FIG. 16 (a) is a cross-sectional view of a water flow generator according to a third embodiment of the present invention, and FIG. 16 (b) is a view taken along the line bb in FIG. 16 (a).

FIG. 17 is an example of its use.

FIG. 18 is also an example of its use.

FIG. 19 is also an example of its use.

FIG. 20 is a cross-sectional view of a water flow generator according to a fourth embodiment of the present invention.

FIG. 21 is a perspective view of a water flow generation device according to a first application example of the fourth embodiment.

FIG. 22 is a front view of a water flow generation device according to a second application example.

FIG. 23 is a perspective view of a water flow generation device according to a third application example.

FIG. 24 is a sectional view of a conventional water flow generator.

FIG. 25 is also a sectional view of a conventional water flow generator.

[Explanation of symbols]

 2 Outer cylinder 3 Drive fluid supply pipe 8 Mooring line 9 Sinker 10 Buoyant material 18 Cylindrical body 19 Eductor 20 Outlet 21 Inlet 22 Strut (post) 26 Outer cylinder upstream end 27 Outer cylinder downstream end 28 Eye plate 29 Gas suction pipe 29b Water channel member 30 Vent pipe line 35 Drive fluid pump facility 44 Garbage removal

Claims (4)

[Claims] 1. An outer cylinder that discharges a water flow generated inside in a predetermined direction, and a driving fluid that is mounted in the outer cylinder and supplied from the outside to accelerate the water liquid in the outer cylinder. A water flow generator comprising an eductor for generating a water flow. 2. The water flow generator according to claim 1, wherein the eductor is provided with a gas suction pipe for sucking gas in addition to the driving fluid from the outside. 3. The water flow generator according to claim 1, wherein the outer cylinder is provided so as to be curved in a required direction. 4. The water flow generator according to claim 1, wherein the outer cylinder is branched and outlets are provided in a plurality of directions.