JP2013022477A5 - - Google Patents

Description

Microbubble generating once-through pump

The present invention relates to water purification by aeration in a sewage treatment plant, improvement of the flow in aquarium for aquaculture of fish and shellfish, aeration technology related to plant cultivation, etc., and friction resistance reduction by covering hull skin with microbubbles Regarding technology.

Conventional techniques in aeration, aquaculture and plant cultivation are as follows.
In the prior art relating to aeration, there are aeration method, bubble injection method, underwater stirring method and the like as a treatment method by aeration, which is one of the necessary steps in sewage treatment (for example, disclosed in Patent Document 1). In all cases, it is difficult to say that the bubble diameter is very small, and since the rising speed is high, it tends to be released to the atmosphere in a short time. In addition, there is a problem in the uniformity of the aeration tank. Further, as disclosed in Patent Document 2, there is a method in which fine bubbles are mixed in the flow on the discharge side of the propeller-type swirl blade, but there is a problem that it is difficult to obtain uniform fine bubbles.

Prior art microbubble generators and water flow supply devices for aquaculture include the following. For example, as disclosed in Patent Document 3, Patent Document 4 and Patent Document 5, there is an example in which a porous air dispersion generator using a ceramic material or the like is installed on the bottom of a water tank as a microbubble generator, However, it is difficult to say that the bubble diameter is very small, the buoyancy rate is fast, and it is released into the atmosphere in a short time, which is inefficient. In addition, as a water flow supply device, for example, as disclosed in Patent Document 6, a pipe provided with a plurality of nozzle holes connected to a water pump is installed below the surface of the water, and the flow is supplied by a jet from the nozzle However, due to diffusion and turbulence after the jet, the water flow does not reach far, and a stable natural flow cannot be obtained.

Therefore, the conventional techniques related to aquaculture do not provide the same good flow as a river, and fine bubbles cannot be efficiently supplied into the aquarium. Therefore, the effect of improving the solubility of oxygen in water is small. It is insufficient.

As a conventional bubble generating device related to plant cultivation, a device that uses a blower to apply pressure to a culture tank and sprays it from a nozzle (Patent Document 7), a device that uses a dispersion generator that uses ceramics, or a hollow water There is a method in which carbon dioxide gas is supplied into the blade and the carbon dioxide gas is made finer and ejected from the rear end of the blade (Patent Document 8). However, it is difficult to obtain uniform fine bubbles and the turbulence is large. There is a problem that the water flow with such bubbles does not reach far. In addition, it is difficult to uniformly supply the entire tank by flow using a stirrer (Patent Document 9).

As for a friction reducing ship using microbubbles, there are a method in which fine bubbles are blown out by thin slits provided on the bow side, a large number of jets and nozzles, and the like. For example, Patent Document 10 discloses that the outlet is slit, Patent Document 11 and Patent Document 12 disclose a large number of outlet shapes, and Patent Document 13 discloses the nozzle shape.

There are various shapes of air outlets, but in any case, the diameter of the discharged air bubbles is not very small, and the influence of the ascending speed is large, and the flow caused by the blowout is turbulent, causing separation and flowing along the hull. There are problems such as difficulty. In particular, when there is a spout on the side of the ship, the blown out bubbles are also affected by buoyancy and turbulence, and it is difficult to stably cover the side of the ship with the bubble flow to the stern. Accordingly, it is difficult to obtain a remarkable energy saving effect by microbubbles.

  According to Non-Patent Document 1, the influence of the buoyancy of the bubble group is large, and in the air blowing method from a thin slit provided on the bottom of the bow on the bow side, the blowing bubbles are unstable and detachment occurs. Since it is difficult to cover stably, it states that it is necessary to provide an end plate on the outer side of the ship bottom to suppress the outflow of bubbles from the side surface of the ship bottom.

  As described above, the conventional techniques such as aeration, aquaculture, and plant cultivation have problems such as the problem of miniaturization of the bubble diameter and difficulty in uniformly supplying the flow containing the microbubbles throughout the tank. The efficiency of the project is poor. In addition, the microbubbles supplied as a friction-reducing ship are also unstable and difficult to be said to be small, and there are buoyancy effects, and it is difficult to cover the entire hull stably.

Public utility hei 6-48898 public information Japanese Laid-Open Patent Publication No. 2005-59002 JP 7-31327 A JP-A-5-168981 Japanese Laid-Open Patent Publication No. 2003-125671 JP-A-6-181657 Public information hei 8-322253 public information Public information No. 6-78745 Public information No. 5-284962 JP-A-9-156576 Japanese Patent Laid-Open No. 9-207873 Japanese Patent Laid-Open No. 11-49080 JP 2008-18781 A Kodama Yoshiaki “Toward the Practical Use of Ship Lubrication Reduction Technology by Air Lubrication”, Journal of the Japan Society of Mechanical Engineers, 112-1086 (2009-5), 46-49.

In the prior art, the bubbles are not sufficiently refined, and the flying speed is high and the efficiency is low. There is a need for a technique for generating microbubbles that uniformly supplies a finer bubble flow than that of the entire tank or along the hull.

The invention described in claim 1 provides a technique for generating microbubbles for supplying fine bubbles together with a uniform flow into tanks such as aeration tanks, aquaculture tanks and culture tanks, and for reducing the frictional resistance of ships. There is. FIG. 1 shows the overall configuration of a microbubble generating once-through pump 80 equipped with a novel aeration technique based on a once-through pump (cross flow pump). (A) is a plan view (b) shows the overall structure of the apparatus. FIG. 2 shows a flow state including bubbles in the cross section of the impeller portion. FIG. 3 shows a device configuration of the microbubble generating once-through pump 81 when the motor is not adapted for underwater use. As shown in FIGS. 1 and 2, the cross-flow pump body is basically a pump casing 30 containing a cylindrical multi-blade impeller 7, a tongue 8 for controlling the flow, and a diffuser having an aeration hole 5 in the impeller. It consists of a pore pipe 4.

The basics of the fine bubble generation technology of the present invention are that the air diffuser pipe 4 inserted in the impeller is rotated at a high speed by a dedicated motor, and the bubbles are discharged from the air diffuser hole 5 while being rotated, thereby being miniaturized. is there. FIG. 1 shows a mechanism for freely rotating the air diffuser pipe 4. As shown in the sectional view of FIG. 1B, the drive shaft 2 of the pump drive motor 12b does not penetrate the impeller 7, and the shaft end of the drive shaft 2 is attached to the impeller boss 23 of the impeller side plate 17 on the drive side. The configuration is fitted. The hollow rotary shaft 16 attached to the impeller side plate on the counter drive side is fitted into the outer ring bearing 27 of the bearing unit 26 having two types of bearings for the outer ring and the inner ring installed on the side surface of the pump casing 30. through fitted to the rear end of the small diameter diffusing pores pipe 4 to the bearing 28 for the inner ring with a gap on the inner diameter side of the impeller hollow rotary shaft 16, protruding the tip of the diffusing pores pipe 4 into the impeller It has a structure. This figure shows a case where the tip of the air diffuser pipe 4 protrudes over the entire width of the impeller and the tip extends to the inside of the steady ring 15 . The rear end of the air diffuser pipe 4 protrudes from the bearing 28 for the inner ring, the shaft installed at the rear part of the bearing is connected to the hollow sub motor 20b, and the hollow shaft of the sub motor and the air diffuser pipe are connected to gas into the impeller. And the rotation of the diffuser pipe 4 are made possible. The diffuser holes 5 are formed by drilling a large number of diffuser holes on the outer peripheral surface of the pipe 4 in the impeller or attaching an additional porous material. As shown in FIG. 1, when the rotational drive source of the air diffuser pipe 4 is the sub motor 20b or 20 (described later), the type A is used.

With this configuration, the cross-flow pump main body that allows the sub-motor 20b to freely adjust the rotation speed and rotation direction of the air diffuser pipe 4 regardless of the rotation of the impeller 7 is installed below the surface of the water, and the rear end of the sub-motor 20b is sealed. Through the hose 13 connected to the bracket 19, gas such as air and carbon dioxide and liquid such as culture solution and neutralizing agent can be supplied from the air pump 11 and the liquid pump 11 b to the portion of the air diffuser hole 5 in the impeller through the hollow shaft of the sub motor 20 b. It has a configuration. The supplied gas is discharged as bubbles from the diffuser holes 5 of the diffuser hole pipe 4 into the impeller, but since the bubbles are discharged from the diffuser holes 5 with rotation, the effect of rotation and the blades are released. By mixing with the flow in the vehicle, the bubbles are discharged with a small diameter. Further, it is subdivided by passing between the rotating blades 6 and discharged into the tank or the like together with the water flow.

Since the diffuser pipe 4 uses the dedicated sub motor 20b as a drive source, it has a feature that the rotational speed and direction can be adjusted regardless of the rotation of the impeller as described above. As the rotational speed of the air diffuser pipe 4 increases, the bubbles become finer. Further, if the direction of rotation of the air diffuser pipe 4 is reversed from that of the impeller, the local disturbance of the flow at the center of the impeller becomes large and further refined. Moreover, the solubility in water will be improved efficiently.

The flow passes through the blades 6 twice from the suction side 9 toward the discharge side 10 as shown in the sectional view of the impeller portion of FIG. That is, the flow flows out from the outside to the inside of the impeller 7 on the suction side 9 and flows from the inside to the outside on the discharge side 10 so as to cross the impeller 7, so that dust or the like is hardly clogged. Since the impeller 7 can be taken long in the width direction and the flow is discharged tangentially to the impeller, the discharge flow is different from the prior art, and is a wide sheet with little turbulence and is far from being diffused. Therefore, the fine bubbles generated in a large amount in the impeller are supplied in a wide and uniform manner together with the discharge flow into the tank. Since the flow of the once-through pump is two-dimensional, in order to increase the flow rate, the length of the impeller 7 in the width direction is simply increased. Alternatively, several cross-flow pump bodies may be connected in the width direction. Further, since the flexible altering can in accordance with the shape of the intended use to port discharge from the suction port comprises a tongue 8, Ru can support the use of versatile.

FIG. 3 shows an apparatus configuration when the driving motor 12 and the sub motor 20 are installed outside the water tank when the driving motor and the sub motor shown in FIG. In this case, since the motor is installed outside the water tank, maintenance is easy.

According to the second aspect of the present invention, the rotation drive source of the air diffuser pipe 4 is changed to the sub motor 20 or 20b, and the air diffuser pipe 4 is driven by the belt 18 using the pulley motor 22 as the drive source as shown in FIG. Can be rotated. Gas or the like is introduced into the diffuser hole pipe 4 from the hose 13 connected to the rear end airtight bracket of the pipe holding bearing 37 that holds the diffuser hole pipe 4 integrated with the pulley so that the gas can be supplied to the diffuser hole 5 in the impeller. ing. The direction of rotation of the diffuser pipe 4 can also be changed. As shown in FIG. 4, when the rotational drive of the air diffuser pipe 4 is the pulley motor 22, the type B is used.

In FIG. 5 , instead of rotating the air diffuser pipe 4 with a dedicated motor, the power of the main motor for driving the impeller is indirectly transmitted to the rotation of the air diffuser pipe 4 by the transmission mechanism so that the speed can be increased. It is a thing. The transmission mechanism is composed of a gear train, a roller train, a planetary gear, and the like. This figure is a gear train, and FIG. 5A is a sectional view of the apparatus, FIG. The apparatus top view is shown. In order to incorporate the gear train 35 into the apparatus, as shown in the sectional view of FIG. 5A, the shaft end of the impeller hollow rotating shaft 16 is installed on the side surface of the pump casing 30 on the non-drive side for rotating the impeller. A small amount protrudes from the bearing 27 and is transmitted to the internal gear 45a of the drive node having teeth attached to the inner side of the annular ring that is fitted into the outer diameter of the hollow rotary shaft at the end of the shaft via the intermediate gear 45b. Power is transmitted to the small gear 45c of the follower node located at the center. The small gear 45c is formed by coaxially integrating the diffuser pipe 4 through the center. By the gear train 35 combining these three kinds of gears, the rotation direction of the air diffuser pipe 4 is opposite to the rotation direction of the impeller 7, and the rotation speed can be larger than the rotation speed of the impeller 7. Bubbles generated in 7 are refined. The rotational speed of the small gear 45c integrated with the air diffuser pipe 4 is increased by the ratio of the number of teeth Za of the internal gear 45a to the number of teeth Zc of the small gear, Za / Zc. The method of supplying the gas to the diffuser pipe is basically the same as that of the pipe holding bearing 37 shown in FIG.
As shown in FIG. 5, when the rotation of the diffuser pipe 4 is transmitted by the gear train 35, the type C is used.

The invention described in claim 3 relates to a gas supply method when the shaft of the sub-motor for rotating the pipe is not hollow. The shaft of the sub-motor 21 for rotating the pipe shown in FIG. 7 is not hollow and cannot pass gas. Therefore, a fixed air-tight air chamber 24 through which the air diffuser pipe 4 passes in the middle of the air diffuser pipe 4 connected to the sub motor 21. Is provided. The pipe portion passing through the air chamber has a structure in which a plurality of small holes 25 and slit holes for introducing gas are formed, and the gas is supplied from the air pump 11 by the hose 13 connected to the air chamber 24, and the blade is passed through the small hole 25. It is configured to send gas into the air diffuser in the vehicle.

FIG. 8 shows a plurality of elongated rod-like bodies 29 in the impeller 7 as shown in a sectional view (a) and a side sectional view (b) in order to further refine the generated bubbles in the impeller of the once-through pump. The air diffuser pipe 4 is provided with a gap on the outer diameter side thereof, arranged in a substantially concentric manner parallel to the rotation axis, and installed across the width of the blade vehicle side plate 17. The elongated rod-shaped body 29 rotates integrally with the impeller, but the rotational speed and direction of the diffuser pipe 4 is different from the driving method as described above. Relatively different. The bubbles released from the air holes are mixed and refined by local wake turbulence caused by the rotation of the elongated rod-like body 29. In addition, if the mixture is mixed with a flow having a large local disturbance due to a difference in rotation speed or rotation direction, the refinement of bubbles is further promoted. The elongated rod-like body in this figure shows an example in which a pipe is wound into a strip shape to produce six rod-like bodies.

By making use of the bubble refining technology by the microbubble generating once-through pump of the present invention and the flow characteristics peculiar to the once-through pump, a large amount of bubbles finer than before can be supplied into the tank or the like with a wide and uniform flow. In the aeration tank, water quality is improved by aeration technology, in the aquaculture tank, the breeding of fish and the water environment are improved, in the culture tank, the growth of plants can be promoted by being able to supply atomized culture solution at the same time. It can contribute to the technology for reducing the hull frictional resistance by microbubbles.

FIG. 1 shows a basic configuration of a microbubble generating once-through pump according to the present invention. (A) is a top view, (b) is sectional drawing which shows the structure of the whole once-through pump including a bubble generation mechanism. FIG. 2 is a cross-sectional view showing the structure of the impeller and the state of bubble flow. FIG. 3 shows an apparatus configuration when the motor is installed outside the water tank when the impeller drive motor and the diffuser pipe drive motor are different from FIG. FIG. 4 is a plan view of a microbubble generating once-through pump of another form in which the rotation driving of the diffuser pipe is different from the apparatus of FIG. FIG. 5 (a) is a cross-sectional view showing the configuration of an apparatus for transmitting the power source of the pump drive motor by a gear train and rotating the diffuser pipe at a high speed, and FIG. 5 (b) shows the configuration of the gear train. 6 is a plan view of the microbubble generating once-through pump shown in FIG. FIG. 7 is a sectional view showing a structure for supplying gas into the impeller through a small pipe hole in the air chamber incorporated in the middle of the diffuser pipe. FIG. 8A is a cross-sectional view showing a structure in which a plurality of elongated rod-like bodies are arranged substantially concentrically in an impeller and passed between the impeller widths for the purpose of bubble miniaturization, and FIG. 8B is a side cross-sectional view. is there. FIG. 9 shows a configuration in which a microbubble generating once-through pump is installed in an aeration tank. (A) is sectional drawing which shows the state of the bubble flow in a tank, (b) is a sectional side view. Example 1 FIG. 10 shows an apparatus configuration when the microbubble generating once-through pump is installed outside the aeration tank. (A) is a top view, (b) is sectional drawing which shows the state of the flow in the pump installed outside the aeration tank, and the bubble flow in an aeration tank. (Example 2) FIG. 11 shows a configuration when the casing shape of the microbubble generating once-through pump is arranged in an in-line type and installed in the middle of the piping. (A) is a top view, (b) is sectional drawing which shows the state of the bubble flow in a line. (Example 3) FIG. 12 shows a configuration in which a microbubble generating once-through pump is installed outside a circulating culture tank for hydroponics and circulated in the tank. (A) is a top view which shows the whole structure, (b) is sectional drawing which shows the condition of the bubble flow in a pump and a culture tank (Example 4). FIG. 13 shows a state of installation and a state of bubble flow when two microbubble generating once-through pumps having a casing swing mechanism are installed under the surface of a rectangular hydroponics culture tank. (Example 5) FIG. 14 is a plan view of FIG. 13 and shows a form when two microbubble generating once-through pumps are installed in the culture tank. FIG. 15 shows the state of bubble flow when a vertically placed microbubble generating once-through pump is installed in a culture tank. (A) is plane sectional drawing, (b) is a YY arrow line view of (a). (Example 6) FIG. 16 shows the state of the bubble flow when the microbubble generating once-through pump is installed on the side and bottom of the ship at the bow. (Example 7) FIG. 17 shows an installed state of the microbubble generating through-flow pump and a state of bubble flow when the friction-reducing ship of FIG. 16 is viewed from the ship bottom side. 18 is an enlarged view of the microbubble generating once-through pump installed on the outer plate of the ship bottom of FIG. 17, (a) is a sectional view of installation, and (b) is a sectional view showing a state of bubble flow. FIG. 19 is a cross-sectional view showing a configuration in which the microbubble generating once-through pump is installed inside the ship bottom, and the water intake port and the discharge port are opened to the outside through the ship bottom outer plate. (Example 8)

Embodiments of the present invention will be described below with reference to FIGS. 9 to 19 for each application field. 9 to 11 are related to aeration, FIGS. 12 to 14 are related to a culture tank, FIG. 15 is related to aquaculture, and FIGS. 16 to 19 are related to a friction-reducing ship. In this embodiment, as described above, the types are classified by the technique of the fine bubble generation technique. When the rotation drive of the air diffuser pipe 4 is the sub motors 20 and 20b, it is type A, when the pulley motor 22 is type B, and when the transmission drive by the gear train 35 is type C.

FIG. 9 shows a mode when a type A microbubble generating once-through pump 83 is installed in the rectangular aeration tank 41 of the first embodiment of the present invention. (A) is sectional drawing which shows the state of a bubble flow, (b) is a sectional side view. In the aeration tank 41, a microbubble generating once-through pump 83 is installed under the water surface near one wall surface so that a wide and uniform fine bubble flow can be supplied into the tank. As shown in FIG. 1, the gas is supplied from the air pump 11 through the hollow shaft of the sub motor 20b to the air diffuser pipe 4 inside the pump impeller, and the air diffuser holes perforated on the outer periphery of the pipe inside the impeller. 5 is supplied with rotation. As described above, the rotational speed and direction of the air diffuser pipe 4 can be freely changed by the sub motor 20b, so that the bubbles released from the air diffuser holes 5 into the impeller are refined if the rotational speed is increased. Further, if the elongated rod-like body 29 shown in FIG. 8 is set, the bubbles are further refined.

According to this embodiment, unlike the prior art, the discharge flow containing fine bubbles supplied by the microbubble generating once-through pump 83 can reach a long distance with a wide water flow. A large circulating flow is formed across from the discharge flow to the suction side. Moreover, since a fine microbubble can be supplied, the efficiency of aeration is good. Accordingly, the processing time can be shortened.

FIG. 10 shows a second embodiment of the present invention in which a type B microbubble generating once-through pump 89 is installed outside the rectangular aeration tank 42. The motor 12 is the rotational drive source for the impeller, and the pulley motor 22 is the rotational drive source for the air diffuser pipe 4. (A) is a top view, (b) is sectional drawing which shows the state of the bubble flow in an apparatus. In this apparatus, a microbubble generating once-through pump 89 is installed outside the aeration tank 42 instead of inside, and the discharge port and suction port of the pump are connected to the aeration tank 42 to circulate. As in the first embodiment, a large amount of fine bubbles can be supplied over the entire aeration tank 42 along with the large circulation flow that goes from the discharge flow to the suction side. In this embodiment, since the microbubble generating once-through pump 89 is installed outside the aeration tank 42, maintenance is easy.

Figure 11 is a third embodiment of the present invention, it is in the form of time incorporating microbubble generating flow pump 84 of the type A in which the pump casing shape-line in the middle pipe. (A) is a top view, (b) is sectional drawing which shows the state which connected the pump in the middle of piping, and the state of bubble flow. The pump uses a casing shape 32 and a tongue shape 8b in which the shapes of the casing 30 and the tongue portion 8 shown in FIG. 10 are arranged in an in-line manner as shown in FIG. If the in-line type microbubble generating once-through pump 84 of this apparatus is connected and connected in the middle of several pipes, the aeration tank can be sufficiently continuously aerated without stopping the flow. Can be made unnecessary.

As shown in this embodiment, since the structure of the once-through pump is two-dimensional and simple, the casing shape including the tongue can be flexibly deformed according to the use state, so that it has an excellent feature that it can be used for various applications. ing.

  FIG. 12 is a fourth embodiment of the present invention, and shows a form in which a microbubble generating once-through pump 85 of type A is installed outside the circulating culture tank 60. (A) is a top view, (b) is sectional drawing which shows the state of the bubble flow in an apparatus. In this apparatus, a discharge port and a suction port of a pump installed outside the culture tank are connected to the culture tank 60 so that the flow circulates. The plant 63 is placed on the water surface side of the U-shaped culture tank 60. The hydroponics float 64 to be cultivated is floated, and the microbubble flow is circulated under the water surface. As shown in FIG. 1, the gas is supplied from the air pump 11 into the diffuser hole pipe 4 by the hose 13, and is supplied as fine bubbles while rotating from the diffuser hole 5 inside the impeller. The culture solution can be made into an environment suitable for plant cultivation by being atomized by the liquid pump 11b and supplied.

According to this embodiment, a wide uniform flow circulating under the hydroponics float 64 floated on the surface of the culture tank 60 by the microbubble generating once-through pump 85 is obtained, and the pump discharges. Along with the flow, fine bubbles and a culture solution can be supplied to the entire tank. Further, since the flow is far less disturbed and does not diffuse, it reaches a long distance, so that a stable circulatory flow can be obtained in the tank without a stirrer as in the prior art. In this embodiment, since the microbubble generating once-through pump 85 is installed outside the culture tank 60, the maintenance is easy as in FIG.

FIG. 13 and FIG. 14 show a fifth embodiment of the present invention, and shows a mode in which two type C microbubble generating once-through pumps 91 are installed on the bottom surface of the culture tank 61. FIG. 13 is a cross-sectional view showing the state of bubble flow in the culture tank, and FIG. 14 is a plan view showing the configuration of the apparatus. This apparatus has a structure in which a hydroponics float 64 for growing a plant 63 is floated on the water surface of the culture tank 61 as in FIG. 12 of the fourth embodiment, and two microbubble generating once-through pumps 91 are installed on the bottom surface below the water surface. It has become. The rotational drive of the air diffuser pipe 4 of this apparatus is transmitted by incorporating the gear train 35 shown in FIG. 5 into the pump. Therefore, the rotation direction of the air diffuser pipe 4 is opposite to the rotation direction of the impeller 7, and the rotation speed is increased by the gear ratio Za / Zc. The angle θ of the periodic direction change in the discharge direction is performed by providing a swing mechanism with a link in the casing movable part.

As shown in FIG. 5, the gas is supplied from the air pump 11 to the air diffuser pipe 4 by the hose 13 connected to the airtight bracket that covers the end face of the gear train 35, and the air diffused in the pipe inside the impeller. The fine bubbles are supplied from the pores 5 while rotating. The culture solution is supplied by being atomized from the same air hole 5 by the liquid pump 11b, and can be made an environment suitable for plant cultivation.

According to this embodiment, the microbubble generation once-through pump 91 swings by the swing mechanism, and the hydroponic cultivation in which fine bubbles and atomized culture solution are floated on the water surface of the culture tank 61 together with the discharge flow of the pump. It is possible to efficiently supply the entire float 64. According to the head swing mechanism, the entire tank can be stably supplied without a stirrer as in the prior art.

  As an example of use of another form of Example 4 and Example 5, the microbubble generating once-through pump of the present invention can be similarly used for the growth culture of algae which is attracting attention as marine biomass. 12 to 14, the hydroponic cultivation float 64 is removed, and a net-like one for algae growth is attached instead, and the carbon dioxide-containing gas is supplied to the air pump 11 in an algae culture tank having substantially the same configuration. 1 is discharged from the diffuser hole 5 through the diffuser hole pipe 4 shown in FIG. 1 described above, whereby fine bubbles of carbon dioxide-containing gas are supplied from the pump discharge port into the tank. The flow containing the fine bubbles of the carbon dioxide-containing gas spreads throughout the tank in the same manner as in the hydroponics, creating an environment suitable for algae growth.

FIG. 15 is a sixth embodiment of the present invention, and shows a form in which a type C microbubble generating once-through pump 92 is installed in a culture tank. (A) is plane sectional drawing, (b) is a YY arrow line view of (a). In this embodiment, the once-through pump is installed vertically, and the drive motor 12 can be installed above the water surface, so that installation and maintenance are easy. The rotational drive of the air diffuser pipe is transmitted through the gear train 35 and is made faster than the rotational speed of the impeller, so that the bubbles released from the air diffuser are made finer. The method for supplying gas from the air pump 11 to the diffuser hole pipe 4 is the same as that in FIG.

According to this embodiment, the discharge flow including the fine bubbles supplied by the microbubble generating through-flow pump 92 is less disturbed and can reach far without being diffused. Therefore, fish can be grown in the same water flow as the river in the aquarium, so that a fish that is firmer than conventional farmed fish can be obtained. In addition, since a stable flow in a certain direction can be obtained, fish do not collide and are not damaged. When changing the discharge water flow speed suitable for each type of fish, it can be easily changed not by adjusting the valve but directly by changing the pump speed.

When the microbubble generating once-through pump 92 is installed near the water surface, the air in the pipe becomes negative due to the rotation of the air diffuser pipe 4, so that air is naturally supplied without using the air pump 11. The Therefore, in this case, the air pump 11 is not necessary.

FIGS. 16 and 17 show a seventh embodiment of the present invention in which the type A microbubble generating once-through pump 86 and 86b are set on the outer plate of the hull. The microbubble generating once-through pump 86 is on the port side below the water surface of the bow, and 86b shows the flow state of the microbubbles when set on the bottom plate. In either case, the casing shape is arranged so that the direction of the suction port and the discharge port of the pump is along the hull outer plate so that the microbubbles flow along the hull surface. FIG. 17 is a plan view depicting half of a symmetrical drawing as viewed from the bottom of the ship. The microbubble generating once-through pump 86b has a structure in which a pump is connected to both end shafts of the submersible motor 12b on the bottom plate of the ship. FIGS. 18 (a) and 18 (b) show an enlarged view of the microbubble flow in the cross section of the pump. The state which flows out along the surface 70b is shown.

The bubble group for covering the hull requires microbubbles which are miniaturized so as not to be affected by buoyancy. There are several methods for the bubble miniaturization technique of the present invention. As shown in FIG. 1 and FIG. 2 described above, the bubbles are discharged from the air diffuser hole 5 into the impeller while being rotated, but become finer as the rotation speed increases. In the present embodiment, since the diffuser hole pipe 4 is rotationally driven by the dedicated sub motor 20b, if the rotational speed of the diffuser hole pipe 4 is increased, the bubbles are made finer and microbubbles are obtained. Further, if the rotation direction is opposite to that of the impeller 7, the turbulence in the flow at the center of the impeller is locally increased, and finer microbubbles can be obtained by mixing bubbles.

According to this embodiment, as shown in FIGS. 16 and 17, the discharge flow of the microbubbles generated in the impeller of the microbubble generating once-through pump 86 installed on the outer shell of the port side of the bow is uniform and stable. Therefore, it flows along the curved hull surface by the Coanda effect (flow flows along the object surface). The discharge flow D of the microbubbles is a wide sheet with little turbulence due to the characteristics of the once-through pump, and it does not diffuse and reaches a long distance as a uniform flow. Since it can be covered with bubbles, the frictional resistance can be reduced efficiently. The microbubble flow discharged from the pump of the microbubble generating once-through pump 86b installed on the outer plate at the bottom of the ship can also cover the surface of the hull with microbubbles in the same manner. As mentioned above, since the flow of the once-through pump is two-dimensional, the size of the hull can be flexibly increased by simply increasing the length of the impeller 7 in the width direction or connecting several once-through pump bodies in the width direction. Yes.

FIG. 19 is a cross-sectional view showing a structure in which the microbubble generating once-through pump 87 is installed inside the ship bottom, and the water intake port 77 and the discharge port 78 are opened to the outside through the hull outer plate. The flow is taken from the outside of the ship through the water intake port 77 by a once-through pump, and the flow of microbubbles is discharged from the discharge port 78 along the outer plate on the bottom of the ship. The effect of the flow of microbubbles along the hull is the same as in the seventh embodiment.

In order to reduce the frictional resistance, basically, a thin boundary layer where the hull surface is in contact with water may be covered with bubbles, and it is not necessary to cover with a thick layer. If the outflow speed of the flow D from the pump discharge port is selected as a speed at which the discharge flow D is most difficult to diffuse in the speed relationship with the external flow F (the flow passing through the vicinity of the hull and related to the speed of the ship and the ocean current). good. The outflow speed from the discharge port can be easily changed by the rotational speed of the impeller. In any case, the flow velocity of the discharge flow D needs to be higher than the velocity of the external flow F. Further, the discharge flow D of the microbubbles contributes not only to the reduction of the hull friction but also to the propulsion of the ship.

The liquid pump 11b is used for supplying chemicals and cleaning liquid through the hose 13 through the hose 13 into the pump to prevent shells and the like from attaching to the pump and cleaning the inside of the pump.

  As described above, the microbubble generating once-through pump of the present invention can contribute as a microbubble generating technique related to aeration technology in a wide range of fields such as aeration, aquaculture, and culture tank and ship friction reduction.

The special aeration technology of the present invention can supply a large amount of fine bubbles uniformly with a wide and stable discharge flow characteristic of a once-through pump, and the shape of the pump casing can be changed flexibly for each application. Since it can respond, it can be used in a variety of fields such as aeration technology related to aeration, aquaculture, plant / algae cultivation, and microbubble generation technology related to ship friction reduction.

2 Motor drive shaft 4 Air diffuser pipe 5 Air diffuser hole 6 Blade 7 Impeller 8, 8b, 8c Casing tongue 9 Pump suction side 10 Pump discharge side 11 Air pump 11b Liquid pump 12 Drive motor (for impeller drive)
12b Motor for driving (for driving impeller, used underwater)
13 Hose 14 Water surface 15 Stabilization ring 16 Impeller hollow rotating shaft 17 Impeller side plate 18 Belt 19 Sub motor rear end sealing bracket 20 Sub motor (shaft is hollow)
20b Sub motor (hollow shaft, used underwater)
21 Sub motor (enhanced shaft)
22 Pulley motor 23 Impeller boss
24 Air chamber 25 Air introduction hole (inside air chamber)
26 Bearing unit 27 Impeller bearing (for impeller hollow rotating shaft)
28 Pipe bearing (for diffused hole pipe)
29 Inside the impeller, a plurality of elongated rod-like bodies 30, 31, 32, 33, 34 attached concentrically between the impeller widths, pump casing 35, gear train 37, pipe holding bearing 40, water tank 41, 42 in the aeration tank 45a Gear (Driving node)
45b Intermediate gear 45c Small gear (follower node)
50 Culture tank 60, 61 Culture tank 63 Plant 64 Hydroponics float 70, 71 Ship 70b Ship bottom skin 75 Screw 77 Water intake port 78 when the pump is installed inside the ship bottom When the pump is installed inside the ship bottom Discharge port 80, 81, 82, 83, 84 Type A microbubble generating once-through pump 85, 86, 86b, 87 Type A microbubble generating once-through pump 88, 89 Type B microbubble generating once-through pump 90, 91, 92 Type C micro-bubble generating once-through pump B Micro-bubbles D Flow of micro-bubbles flowing from the pump outlet along the hull surface F External flow (flow past the hull in relation to ship speed and ocean current)
S Flow that blows out as fine bubbles (fine particles) from air diffuser θ Angle of swing of pump casing

Claims (3)

In a multi-blade once-through pump with a cylindrical impeller shape, the motor drive shaft does not penetrate the impeller, and the shaft end of the motor is fitted to the impeller boss of the impeller side plate on the drive side, and the non-drive side the impeller rotary shaft which is mounted on the impeller side plates in the structure was a hollow, to hold those said impeller hollow rotary shaft, a bearing portion that is disposed on the side surface of the pump casing of the two inner ring and outer ring The unit structure is provided with a rotary bearing, and a clearance is formed on the inner diameter side of the impeller hollow rotary shaft fitted into the outer ring bearing, and the rear end of the small-diameter diffuser pipe is fitted into the inner ring bearing and passed therethrough. The end of the air diffuser pipe protrudes into the impeller, the rear end of the air diffuser pipe protrudes from the bearing for the inner ring, and the shaft installed at the rear of the bearing is connected to the hollow sub motor. Connect pore pipes A cross-flow pump main body that enables gas supply into the impeller and rotation of the diffuser pipe is installed below the surface of the water, and gas and the like are supplied from the outside through the hollow shaft from the hose connected to the sealing bracket at the rear end of the sub motor. A microbubble-generating through-flow pump characterized in that it is supplied to the air diffuser in the impeller and the air diffuser pipe is freely rotatable. From the hose connected to the sealing bracket at the rear end of the bearing holding the air diffuser pipe that rotates coaxially through the pulley center as a belt drive by a pulley motor instead of the sub motor as the rotational drive source of the air diffuser pipe The microbubble generating once-through pump according to claim 1, wherein gas or the like can be supplied to the air diffuser in the impeller through the air diffuser pipe fitted in the bearing. As a gas supply method when the shaft of the sub-motor for rotating the diffuser pipe according to claim 1 is not hollow, a fixed air-tight air chamber through which the diffuser pipe penetrates is provided in the middle of the diffuser pipe connected to the sub-motor, The pipe part that passes through the air chamber has a structure with a plurality of small holes and slit holes for introducing gas into the pipe, and the hose connected to the air chamber allows gas etc. from the outside to enter the pipe in the air chamber. 2. The microbubble generating once-through pump according to claim 1, wherein the microbubble generating once-through pump is supplied to the air diffuser in the impeller through the small hole opened.