JP2006025729A - Water flow generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate water flow in a fish breeding pond for fish culture. <P>SOLUTION: The water flow generator has a simple structure and is producible at a low cost because the pump room 40 of the generator is placed under an opening 42 of main bodies 20, 21, and ejects water sucked through the opening 42 of the main bodies 20, 21 by the rotation of an impeller 35 attached to a rotary shaft 34. The swallowing of soil and sand by the cultured fish is prevented because the pump chamber 40 sucks the water of the pond through the opening 42 opened on the upper part of the main bodies 20, 21 and ejects through the ejection part 43 of the pump chamber 40 to prevent the suck of soil and sand precipitated to the bottom of the pond into the flow generation apparatus. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water flow generating device that generates a water flow in the water of a fish farm that cultivates aquaculture fish such as sharks, sharks, or sharks that have the property of forming a group and swimming against a flow.

 Fish farms that cultivate aquaculture fish such as sharks, sharks or sharks that have the property of swimming against the flow that form a group are made in a rectangular shape, a round shape, or other shapes. It is difficult to cultivate to the same quality as natural fish because it is cultured freely by swimming.

 Generally, in this fish farm, it is difficult to exercise the cultured fish sufficiently, and the cultured fish cultured without sufficiently exercising easily becomes sick and easily accumulates stress and becomes dark. In addition, compared with natural fish, there is a problem that extra body fat is attached, so-called obese fish does not have good meat quality, and the market price is reduced.

For this reason, fish farms have been created that take advantage of the nature of farmed fish to swim against the water flow when cultivating farmed fish. In addition, in order to make the cultured fish less stressed, the right-handed and left-handed flow passage parts are connected in series, and the circulation passage has an environment resembling that of a natural river. There has been proposed a technique for preventing stress accumulation in cultured fish provided with a circulating flow forming means for making the water flow in the flow path in a certain direction (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-45083 (second column, lines 16 to 27, FIG. 1)

In addition, in order to compensate for the lack of dissolved oxygen in the sea, rivers, and lakes where water is stagnant, there is a hull with an opening that opens toward the water in the center, and a rising position and a falling position. A water flow generating means mounted on the hull so that the position of the water flow can be changed through the opening, and a position changing means for changing the position of the water flow generating means between the raised position and the lowered position. A parallel flow type link structure having a water flow machine that generates a water flow in a direction, the position changing means facing the opening, the base end side being linked to the hull, and the front end side being linked to the water flow generating means. A water flow generator having a driving means for causing the parallelogram link structure to perform a link motion has been proposed. Then, the hull with the water flow generating means set at the ascending position is floated in a predetermined water area and towed or self-propelled to the target location, and the position of the water flow generating means is changed to the lowered position by the beating means of the position changing means at that location, By driving the water flow machine in this state, a water flow generation device has been proposed in which the water flow generation means sucks and discharges the surrounding water, thereby generating a water flow in the stagnant water and increasing the amount of dissolved oxygen. (For example, refer to Patent Document 2).
JP-A-10-226391 (7th column 47 line-8th column 15 line, FIG. 3)

  However, the above-mentioned Patent Document 1 uses a property that aquaculture fish swims against a water current, generates a water current in a certain direction of the fish farm, and cultivates the farmed fish in a less stressed state and the fish farm. The technology is disclosed, and there is no specific proposal for a water flow generator that generates a water flow in the flow path of the fish farm. In fish farms premised on aquaculture, the density of fish per unit volume is high, and if a flow path is formed, efficient aquaculture cannot be performed, and the above-mentioned Patent Document 1 is not practical.

 Moreover, the said patent document 2 drives a water flow machine in the water of the water area where water, such as the sea, a river, and also a lake, stagnated, and a water flow generation means sucks in the surrounding water and discharges it, thereby A technique for generating a water flow in stagnant water and increasing the amount of dissolved oxygen is disclosed. However, the technology disclosed here is only aimed at increasing the amount of dissolved oxygen, and the water is flown into the water of fish farms that cultivate farmed fish such as carp, carp or carp that swim against the flow. The water flow generation device to be generated is a disclosure of technical ideas that have different purposes for generating a water flow. Furthermore, the water flow generating device disclosed here is a large-scale device itself.

 In addition, about the technique which stirs water aiming at the increase in the amount of dissolved oxygen, there are many indications, such as Unexamined-Japanese-Patent No. 8-290193, for example. However, none of them disclose a specific configuration of a water flow generating device that generates a water flow in the water storage of a fish farm that cultivates farmed fish.

  The present invention has been made in view of these circumstances, and has a simple structure for generating a water flow in the water of a fish farm that cultivates farmed fish. It is an object to provide an apparatus.

 In order to achieve the above-mentioned object, the water flow generator of the invention of claim 1 is configured as a whole by a substantially hollow columnar body and an opening for sucking water from the fish farm is formed around it. And a rotation shaft that is rotatably arranged in the hollow of the main body, extends in the longitudinal direction of the main body (which means the immediately preceding word), and is installed at an upper portion of the main body, A drive device for rotating the rotating shaft, and an impeller mounted on the rotating shaft, which is located below the opening of the main body, is accommodated, and sucked from the opening of the main body by the rotation of the impeller A pump chamber having a discharge part for discharging the collected water.

 Here, the main body portion is generally composed of a substantially cylindrical hollow columnar body. However, the main body portion mainly serves as a water passage, and therefore the whole body portion is not limited to a substantially cylindrical shape. , A substantially rectangular tube shape and a substantially polygonal tube shape. In addition, the opening can be formed into a circular shape or an elliptical shape that is long in the length direction, a rectangular shape, a polygonal shape, or the like.

 In addition, the rotating shaft is rotatably disposed inside the hollow portion of the main body portion and extends in the longitudinal direction of the main body portion. When the present invention is carried out, the drive device and the pump chamber What is necessary is just to connect with an impeller.

 And the said drive device is installed in the upper part of a main-body part, and rotates the said rotating shaft, and even if it connects a motor directly, or the rotation shaft of a motor is rotated via a reduction mechanism, the said rotating shaft You may connect to. In any case, the drive device only needs to have a drive source for the rotating shaft.

 Further, the pump chamber may be provided in a lower portion of the main body, and may constitute a chamber that houses an impeller attached to the rotating shaft.

 Furthermore, the discharge part is located below the opening part of the main body part, and is a part that discharges the water sucked from the opening part of the main body part by the rotation of the impeller. It constitutes.

  In addition, the water flow generator of the invention of claim 2 further comprises a feed pipe for feeding a gas containing oxygen to the pump chamber.

  This feed pipe may feed air from the outside by a pump, or may be provided with only the feed pipe and suck a gas containing oxygen by the negative pressure formed by the impeller. . As a result, the phenomenon that the air is not drawn in due to the change in the water level and the oxygen concentration in the water is attenuated is avoided.

And the water flow generator of invention of Claim 3 was produced | generated by the mixed gas production | generation apparatus which produces | generates the mixed gas which mixes ozone with the gas containing oxygen further to the invention of Claim 1, and the said mixed gas production | generation apparatus. And a feeding pipe for feeding the mixed gas to the pump chamber.
This feed pipe may feed a mixture of oxygen and ozone from the outside with a pump of air, or only a feed pipe and a gas containing oxygen due to the negative pressure formed by the impeller May be sucked. As a result, the phenomenon that the air is not drawn in due to the change in the water level and the oxygen concentration in the water is attenuated is avoided.

  Furthermore, in the water flow generator of the invention of claim 4, the opening according to any one of claims 1 to 3 is a groove-like opening extending in the length direction of the main body. is there.

  This groove-like opening can take in water from the upper layer in the water, and part of the groove-like opening makes it easy to suck air from the air, and discharges the water and air sucked from the pump chamber. be able to.

 According to invention of Claim 1, the pump chamber located in the lower part of the opening part of a main-body part is the structure which discharges the water suck | inhaled from the opening part of the main-body part by rotation of the impeller attached to the rotating shaft. Therefore, the structure is simple and can be manufactured at low cost. In addition, the pump chamber sucks water from the fish farm through the opening at the top of the main body and ejects it from the discharge section of the pump chamber. Fish that are cultivated do not swallow earth and sand because it can be made into a water stream that is not sucked.

  According to the invention of claim 2, in addition to the effect of claim 1, a feed pipe for feeding a gas containing oxygen is disposed in the pump chamber. The oxygen concentration dissolved in the water in the field can be increased. This supply of oxygen can purify the water quality and improve the growth of cultured fish.

  According to the invention of claim 3, in addition to the effect of claim 1, a mixed gas obtained by mixing ozone with a gas containing oxygen is generated, and the generated mixed gas is fed from the discharge portion of the pump chamber. Because it spouts out with water, it enables the cultivation of farmed fish with less disease. Moreover, the oxygen concentration dissolved in the water of the fish farm can be increased even when the water level changes. This supply of oxygen can purify the water quality and improve the growth of cultured fish.

 According to invention of Claim 4, the opening part of the main-body part of the water flow generator in any one of Claims 1 thru | or 3 was made into the groove-shaped opening part extended in the length direction of the said main-body part. Therefore, it is possible to cope with fluctuations in the water level and to inhale air.

  Exemplary embodiments of a water flow generating device according to the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIG.
FIG. 1 is a conceptual diagram showing a plan view of a state in which the water flow generator according to Embodiment 1 of the present invention is used in a rectangular fish farm. FIG. 2 is a front view of the water flow generator of the first embodiment with a part thereof broken for convenience. 3 is a front view of an impeller used in the water flow generator according to Embodiment 1 of the present invention, and FIG. 4 is a cross-sectional view taken along line XX of FIG. FIG. 5 is a horizontal cross-sectional view of the pump chamber used in the water flow generator of Embodiment 1 of the present invention.

 In FIG. 1, a fish farm 10 contains water 11 having a predetermined depth. At a desired position of the fish farm 10, the water flow generator 12 according to the first embodiment is located close to the wall surface. The portion is arranged so as to protrude from the water surface.

 The water flow generator 12 is connected so that electric power is supplied directly from the AC power source 13 or via the inverter device 14, and receives the electric power, as described later, the water 11 of the fish farm 10, for example, A water flow 15 indicated by a one-dot chain line is generated. The aquaculture fish 16 indicates a carp, a carp or a carp that swims against the water flow 15.

 In FIG. 1, for convenience of explanation, the inverter device 14 is illustrated as a separate body from the water flow generator 12, but actually the inverter device 14 is integrally configured in an electric motor that is a drive source of the water flow generator 12. It functions as a so-called inverter motor. The mechanism by which the water flow generator 12 generates the water flow 15 in the water 11 of the fish farm 10 will be described later.

  FIG. 1 illustrates a method of supplying power to the water flow generator 12 from the AC power supply 13 via the inverter device 14. However, the power is supplied from a solar generator or the like that performs solar power generation instead of the AC power supply 13. A method of supplying the above may be adopted.

  In FIG. 2, the water flow generating device 12 includes a lower body portion 20 made of a hollow cylindrical body, and an upper body portion that is mounted on the upper portion of the lower body portion 20 and made of a hollow cylindrical body having substantially the same diameter as the lower body portion 20. 21 and an electric motor 22 which is a drive source of the water flow generator 12 are provided.

  The lower body part 20 and the upper body part 21 include a lower flange 23 formed at the upper part of the lower body part 20 and an upper flange part 24 formed at the lower part of the upper body part 21 by using a fastening tool such as a screw ( It is constituted integrally by tightening with (not shown).

 The main body 25 of the water flow generator 12 is configured by integrating the lower body 20 and the upper body 21. In the present embodiment, the case where the main body portion 25 is configured by the lower body portion 20 and the upper body portion 21 has been described. However, when the present invention is implemented, the body portion 25 may be integrally formed.

  The electric motor 22 is attached to the upper body portion 21 via an attachment seat 26, and is connected to the AC power source 13 via a terminal (not shown) of a terminal box 27 of the electric motor 22. The output shaft 28 of the electric motor 22 projects into the gear case 29, and an output side belt pulley 30 is attached to the projecting end of the output shaft 28. The output side belt pulley 30 is connected to a load side belt pulley 32 and a belt 31. The output side belt pulley 30 is configured to be connected to the load side belt pulley 32, and the output side belt pulley 30, the belt 31, and the load side belt pulley 32 are accommodated in the case 29, and the water flow is performed together with the electric motor 22. A drive device 33 of the generator 12 is configured.

  The rotating shaft 34 is made of a metal rod, and is arranged so as to extend in the longitudinal direction in the hollow interior of the main body portion 25 including the lower body portion 20 and the upper body portion 21. A load side belt pulley 32 is attached to the upper part of the rotating shaft 34, and an impeller 35 is attached to the lower part.

 The impeller 35 is configured as shown in FIG. 4 which is a plan view of FIG. 3 and a cross-sectional view taken along line XX of FIG.

 That is, the impeller 35 is formed integrally with the rotating shaft 34 by, for example, a bearing portion 37 attached by a bolt 36, a stirring blade 38 formed integrally with the bearing portion 37, and the stirring blade 38. And a plurality of blades 39. The impeller 35 is formed of a nonmetal such as aluminum, metal, resin, or the like, and is disposed in a pump chamber 40 formed at the lower end of the lower body 20. The slats 39 are formed in a rectangular shape as viewed from the front or a trapezoid with a reduced width at the top. The shape of these slats 39 is determined by the amount of discharged water, the suction force, the rotational speed, and the like. That is, the shape and model of the impeller 35 are arbitrarily determined by the amount of discharged water, the suction force, the rotational speed, and the like.

  The bearing 41 is a bearing that is mounted in the upper body portion 21 and supports the rotary shaft 34 in a rotatable manner. Further, the circular opening 42 is an opening formed in the lower body portion 20 and serves as a suction port for the water 11 of the fish farm 10 generated by the rotation of the impeller 35, as will be described later. The circular opening 42 is formed at a position above the pump chamber 40 of the lower body 20. Further, if it is formed at a position that is too low, earth and sand will be sucked into the interior of the lower body portion 20 and the like, so it is preferable to form it slightly below the water surface. The circular openings 42 have a desired diameter and are formed at a predetermined interval around the lower body 20, and the positions of the circular openings 42 from the pump chamber 40 are substantially the same height. In consideration of fluctuations in mechanical strength and water level, it is formed in the vicinity.

  The discharge part 43 is a water discharge port whose front end part is opened to the fish farm 10 and the other end part is ejected from the pump chamber 40. FIG. The discharge portion 43 discharges the water 11 sucked from the circular opening portion 42 formed in the lower body portion 20 in a direction substantially parallel to the bottom surface of the fish farm 10, and is shown by an arrow W in FIG. To form a water stream. The base 44 is an attachment member at the lowermost part of the water flow generator 12, and is provided so that the water flow generator 12 can be stably installed so as not to fall over at the fish farm 10. Therefore, installation stability and weight are heavy.

 The gas generating device 45 supplies the generated oxygen-containing gas, for example, air, to the pump chamber 40 through the gas supply pipe 46. The gas supply pipe 46 is fastened to the lower body part 20 via a spacer 48 by a fastening member 47. Further, the gas containing oxygen generated by the gas generating device 45 is supplied, shut off, or adjusted in the amount supplied by a valve 49 provided at a desired location of the gas supply pipe 46.

  In the above description, in order to transmit the rotational force of the output shaft 28 of the electric motor 22 to the rotary shaft 34, the output belt pulley 30, the load side belt pulley 32, and the belt 31 housed in the case 29 are transmitted. However, it is only necessary to transmit the rotational driving force of the output shaft 28 of the electric motor 22 to the rotating shaft 34. For example, the output side belt pulley 30, the belt 31, and the load side belt pulley 32 may be transmitted as gears. Alternatively, the output shaft 28 and the rotating shaft 34 of the electric motor 22 may be directly connected and transmitted. Various means such as using a well-known geared motor can be used. When adopting the transmission method using the belt pulley 30, the belt 31 and the load side belt pulley 32, or the transmission method using a geared motor, the combination of gears, the combination of a belt and a pulley, or the gear ratio of the geared motor. The rotational force or rotational speed of the rotating shaft 34 can be arbitrarily selected.

  The water flow generator of the first embodiment is configured as described above and operates as follows.

  First, when the water flow generator 12 is installed at a desired position in the fish farm 10, the water 11 enters from the circular opening 42 formed in the lower body portion 20 of the water flow generator 12 to the water surface position 50 in the lower body portion 20. The pump chamber 40 is filled with water 11. Next, when electric power is supplied from the AC power source 13 to the electric motor 22, the electric motor 22 is rotationally driven, and this rotational driving force is transmitted from the output side belt pulley 30 accommodated in the case 29 via the belt 31 to the load side belt pulley. A rotational force is transmitted to 32 to rotate the rotating shaft 34. The rotating shaft 34 is supported by the bearing 41 and rotates to rotate the impeller 35 disposed in the pump chamber 40.

  By rotating the impeller 35, the water 11 is sucked from the circular opening 42 formed in the lower body portion 20 of the water flow generator 12, and the sucked water 11 is given centrifugal force and discharged from the discharge portion 43. Is done. As shown in FIG. 1, the discharged water 11 forms a water flow 15 in the water 11 of the fish farm 10, and the aquaculture fish 16 such as bream, bream or bream is formed against the formed water flow 15. Swim in a flock.

Further, a gas containing oxygen generated by the gas generating device 45, for example, by opening the valve 49, air or oxygen is supplied to the pump chamber 40 through the gas supply pipe 46, and is supplied to the water 11 of the fish farm 10. Supply oxygen. This supply of oxygen purifies the water quality and has a good effect on the growth of the cultured fish 16.
At this time, air or oxygen may be supplied to the pump chamber 40 through the gas supply pipe 46 by an external pressure pump, or the pump chamber 40 may be supplied without relying on an external pressure pump. You may supply using suction force. In addition, when the distance between the water level of the fish farm 10 and the circular opening 42 formed in the body part 20 is short, air can be naturally involved and oxygen can be supplied to the water 11 of the fish farm 10. In particular, by using the gas supply pipe 46, air can be supplied to the pump chamber 40 regardless of the distance between the water level of the fish farm 10 and the circular opening 42 formed in the body part 20.

  Thus, this Embodiment 1 is the water flow generator which generates a water flow in the water 11 of the fish farm 10 which cultivates farmed fish, and the whole becomes a substantially hollow columnar body, and the water 11 of the fish farm 10 is surrounded around it. A main body 25 composed of a lower body 20 and an upper body 21 formed with an opening such as a circular opening 42 for sucking in, and is rotatably disposed in a hollow interior of the main body 25, in the longitudinal direction of the main body 25. The rotating shaft 34 that is extended, the driving device 33 that is installed above the main body portion 25 and rotationally drives the rotating shaft 34, and is positioned below the opening portion such as the circular opening 42 of the main body portion 25. And a pump chamber 40 having a discharge portion 43 for discharging water 11 sucked from an opening portion such as a circular opening 42 of the main body portion 25 by the rotation of the impeller 35. It is to be prepared.

 Accordingly, the water flow generator 12 that forms the water flow 15 in the water 11 of the fish farm 10 is driven to rotate by the electric motor 22, the rotary shaft 34 with the impeller 35 attached to the tip, the main body 25 having the circular opening 42, and The water flow generator 12 having a simple structure can be obtained, which can be constituted by the discharge portion 43 that discharges the pressure water generated in the pump chamber 40 by the impeller 35.

 Further, in order to form the water flow 15 in the fish farm 10, the water 11 close to the water surface 50 of the fish farm 10 is sucked from the opening made of the circular opening 42, close to the bottom, and in a direction substantially parallel to the bottom surface. Since the water 11 is discharged from the discharge portion 43, a water flow can be formed near the bottom without sucking earth and sand into the water flow generator 12. Furthermore, since the cultured fish can be exercised sufficiently, excess body fat can be removed without giving stress, and a cultured fish with good meat quality can be obtained.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described.

 FIG. 6 is a front view of the water flow generator of the second embodiment with a part thereof broken for convenience. In the present embodiment, the same symbols or the same reference numerals as those in the first embodiment indicate the same or corresponding components as those in the first embodiment, and therefore, a duplicate description is omitted here.

 In FIG. 6, the mixed gas generation device 60 includes an ozone generation device 61 that generates a mixture of ozone generated by the ozone generation device 61 and a gas containing oxygen. It is. A mixture of oxygen-containing gas and ozone generated by the mixed gas generation device 60 is supplied to the pump chamber 40 through the gas supply pipe 46 as in the first embodiment.

  As is well known, ozone has a bactericidal action and changes to oxygen in water. Therefore, a mixture of ozone and a gas containing oxygen generated by the mixed gas generation device 60 according to the second embodiment is used as the pump chamber 40. , Ozone can be dissolved in the water flow formed by the impeller 35 of the water flow generator 12 to prevent the occurrence of disease in the cultured fish. That is, according to the second embodiment, the effects of the first embodiment are obtained, and the effect of enabling the cultivation of cultured fish with less illness is exhibited.

 In FIG. 6, a groove-like opening 70 formed in a portion buried in the water 11 around the lower body part 20 has a long opening shape in the depth direction of the water level, that is, in the height direction of the lower body part 20. Is.

 As described above, when the opening serving as the suction port for the water 11 is formed at a very upper position of the lower body portion 20, the water 11 is not sucked when the water surface is lowered, and when it is formed at a lower position, the lower body portion is formed. Since earth and sand and the like are sucked into the interior of 20 or the like, it is preferably formed at a position slightly below the water surface at a position buried in the water 11.

 As in the second embodiment, the water level of the fish farm where the water flow generator 12 is installed can be obtained by making the opening serving as the inlet for the water 11 into the groove-like opening 70 having an opening shape long in the depth direction. Even if it falls, the water 11 can be sucked from the groove-shaped opening 70 and can be discharged to the outside from the discharge part 43 through the pump chamber 40. That is, the water flow generator 12 that can cope with fluctuations in the water level is obtained.

 The restricting plate 80 restricts the intake of the water 11 in the groove-shaped opening 70, that is, the opening, and is provided depending on the depth of the water 11 in the fish farm 10 or the presence of suspended matter. The restriction plate 80 can be attached to the main body 25 with a bolt 81 and set to the area of the opening formed by the groove-shaped opening 70 serving as an arbitrary water 11 inlet.

 In each of the above embodiments, the main body portion 25 of the water flow generator 12 is illustrated and described as being formed of a hollow cylindrical body. However, the gist of the present invention is that the rotary shaft 32 can be rotatably disposed in the hollow interior. Needless to say, a hollow prismatic body or the like may be used as long as it is a so-called hollow columnar body.

 Further, in each of the above embodiments, the main body 25 of the water flow generator 12 is illustrated and described with a plurality of circular openings 42 or groove-shaped openings 70 formed at predetermined intervals around the main body 25. Of course, it is only necessary to introduce the water 11 into the water. Therefore, it is not necessary to form a plurality of water, and it is needless to say that only one water 11 may be formed.

  As described above, according to the water flow generating device according to the present invention, as a means for generating a water flow in the water of a fish farm that cultivates aquaculture fish such as bream, bream or bream having the property of swimming against the flow, it is simple. There is a structure, a low cost, and a water flow generating device that does not suck underwater sediments into the device, and the industrial applicability is great.

FIG. 1 is a conceptual diagram showing a plan view of a state in which the water flow generator of Embodiment 1 of the present invention is used in a rectangular fish farm. FIG. 2 is a front view of the water flow generator of Embodiment 1 with a part thereof broken. FIG. 3 is a front view of an impeller used in the water flow generator of Embodiment 1 of the present invention. 4 is a cross-sectional view taken along line XX of FIG. FIG. 5 is a horizontal cross-sectional view of the pump chamber used in the water flow generator of Embodiment 1 of the present invention. FIG. 6 is a front view of the water flow generator of Embodiment 2 with a part thereof broken.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fish farm 11 Water 12 Water flow generator 25 Main-body part 33 Drive apparatus 34 Rotating shaft 35 Impeller 40 Pump chamber 42 Circular opening part 43 Discharge part 45 Gas generator 46 Gas supply pipe 60 Mixed gas generator 61 Ozone generator 70 Groove Opening

Claims (4)

In a water flow generator that generates a water flow in the water of a fish farm that cultivates cultured fish,
The whole is a substantially hollow columnar body, and a main body portion in which an opening for sucking in the water of the fish farm is formed around it,
A rotating shaft that is rotatably arranged in the hollow portion of the main body, and extends in the longitudinal direction of the main body;
A drive device installed on an upper portion of the main body and rotating the rotation shaft;
It has a discharge part which is located in the lower part of the opening of the main part, accommodates the impeller attached to the rotating shaft, and discharges water sucked from the opening of the main part by the rotation of the impeller. A water flow generator comprising a pump chamber.   The water flow generator according to claim 1, wherein a feed pipe for feeding a gas containing oxygen is disposed in the pump chamber.   The apparatus further comprises: a mixed gas generating device that generates a mixed gas that is mixed with ozone in a gas containing oxygen; and a feed pipe that supplies the mixed gas generated by the mixed gas generating device. The water flow generator described in 1. The water flow generator according to any one of claims 1 to 3, wherein the opening of the main body is a groove-shaped opening extending in a length direction of the main body.