JP2012125690A - Through-flow pump aeration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aeration apparatus which supplies a large amount of microbubble with water stream to the whole of a tank efficiently and uniformly in an aeration tank, a farming tank, and a culture tank.SOLUTION: The through-flow pump aeration apparatus composed of a through-flow pump (crossflow pump) of a cylindrical multi wing impeller shape that has a microbubble generation mechanism is set up in the aeration tank, the farming tank, and the culture tank, and a pump casing is made to swing centering a rotary shaft by a rotation transmission mechanism, thereby water stream with a microbubble is supplied to the whole of the tank, and effective aeration is done. The generation of the microbubble is obtained from a diffusion hole that is drilled in the hollow rotating shaft of the impeller and a porous material put in addition with the rotation.

Description

The present invention relates to water quality purification in a sewage treatment plant, improvement of the flow in an aquarium for aquaculture of all seafood, and aeration technology in hydroponics and algae cultivation.

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. There is also a problem in the uniformity of the aeration tank and the stirring method.

As a pump type aeration apparatus used for aeration, as disclosed in Patent Document 2, there is a method of mixing fine bubbles into the discharge side flow of a propeller-type swirl blade. Considering the characteristics of the surrounding flow direction, it is basically limited to a square tank or a circular tank, and there are problems such as being unable to cope with water tanks of various shapes and difficult to obtain uniform fine bubbles.

Prior art microbubble generators and water 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.

As a conventional bubble generating device related to plant cultivation, a device in which a pressure is applied by a blower in a culture tank and sprayed from a nozzle (Patent Document 7), a device using an air dispersion generator using ceramics, etc., or a cavity There is a method of supplying carbon dioxide gas to the inside of the hydrofoil, and making the carbon dioxide gas finer and ejecting from the rear end of the blade (Patent Document 8). There is a problem that the water flow with uniform 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 described above, the conventional technology has problems such as a reduction in the bubble diameter and difficulty in uniformly supplying a flow containing the fine bubbles to the entire tank, and the efficiency of aeration is poor.

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

In the prior art, the bubbles are not sufficiently refined, and the flying speed is high and the efficiency is low. Further, there is a need for an aeration technique for uniformly supplying fined bubbles throughout the tank.

  The invention described in claim 1 is to supply fine bubbles with a uniform flow to the entire inside of a tank such as an aeration tank, a culture tank, and a culture tank. 1A is a cross-sectional view of a main body 50 showing a basic structure of a once-through pump (cross-flow pump), and FIG. 1B is a cross-sectional view taken along line YY of FIG. . The cross-flow pump main body 50 basically comprises a casing 15 accommodating a cylindrical multi-blade impeller 7 and a hollow rotary shaft 3 having a tongue 8 and a diffuser hole 5 for controlling the flow. The basic once-through pump aeration device 55 is connected to the air pump 11 and the liquid pump 11b connected by the hose 13 for supplying air or the like to the once-through pump main body 50, and the drive connected to the hollow rotary shaft 3 having air diffuser holes. It consists of a motor 12.

The flow passes through the blade 6 twice from the suction side 9 toward the discharge side 10 as shown in the impeller cross-sectional view of FIG. That is, the flow flows from the outside of the impeller 7 to the inside on the suction side 9 and flows out from the inside to the outside on the discharge side 10 to cross the impeller 7. Since the impeller 7 can be long in the width direction, and the flow is discharged tangentially to the impeller, the discharge flow is a wide sheet, less turbulent, and does not diffuse, unlike the prior art. Because it can reach far, the flow of microbubbles spreads throughout the water tank. Further, since the inlet and outlet of the blade 6 on the suction side are reversed on the discharge side, it is an excellent strength in operation that an object is not easily clogged between the blades.

As shown in FIGS. 1 (a) and 1 (b), the structure for generating fine bubbles is such that a large number of diffused holes 5 are constricted on the outer peripheral surface of the hollow rotary shaft 3 in the impeller 7, or an additional porous material. And an air pump 11 and a liquid pump 11b connected to the hose 13 outside the impeller through the hollow rotary shaft 3 so that gas and liquid can be supplied. The gas supplied from the outside into the impeller is discharged as bubbles from the diffuser holes 5 of the hollow rotary shaft 3 as indicated by S, but the bubbles are discharged from the diffuser holes 5 with rotation. Therefore, bubbles are discharged with a minute diameter due to the effect accompanying rotation, and further subdivided by passing between the rotating blades 6 and discharged as uniform minute bubbles and discharged into the tank together with the water flow. Is done. The bubble diameter becomes finer as the rotation speed is larger. The method of supplying fine bubbles from the diffuser holes 5 of the hollow shaft 3 in the rotating impeller 7 is an excellent fine bubble supply device because it has a function of efficiently increasing the solubility in water.

  In the present invention, the pump casing itself is swung by a predetermined angle by a swing mechanism centering on a rotation shaft by a rotation transmission mechanism such as a planetary gear, and the discharge direction is changed by a predetermined angle swing. Can be supplied in a wide range. Therefore, aeration is distributed throughout the tank, and the efficiency is good.

According to the once-through pump aeration apparatus of the present invention, a wide and good uniform flow including fine bubbles such as air, ozone and carbon dioxide, which cannot be obtained by the prior art, is put into the tank according to the usage situation of each application. Can supply. In aeration tanks, water quality should be improved by aeration technology, fish tanks should be able to raise fish and improve the water environment, and culture tanks should be able to supply atomized culture solution at the same time in addition to aeration techniques. Can contribute to the technical improvement of hydroponics and algae cultivation.

FIG. 1 shows the basic structure of the once-through pump aeration apparatus of the present invention. (A) is sectional drawing which shows the structure of a cross-flow pump main body, (b) is sectional drawing of the cross-flow pump aeration apparatus of the YY arrow of (a). FIG. 2 shows a state in which a once-through pump aeration device having a pump casing swing mechanism for periodically changing the discharge direction is installed in a rectangular aeration tank. (A) is a top view, (b) is a sectional side view showing the state of the flow in the tank. Example 1 FIG. 3 shows an example in which two once-through pump aeration devices having a pump casing swing mechanism are installed in the aeration tank in order to increase the processing capacity of the aeration tank. (A) is a top view, (b) is a sectional side view showing the state of the flow in the aeration tank. (Example 2) FIG. 4 shows an installation state in the case where two once-through pump aeration devices having a pump casing swing mechanism are installed below the surface of a culture tank for rectangular hydroponics. (A) is a top view, (b) is a side sectional view. (Example 3) FIG. 5 shows a flow state when a once-through pump aeration device having a pump casing swing mechanism is installed in the fish tank. (A) is a top view, (b) is a YY arrow sectional drawing. Example 4 FIG. 6 shows a flow state when a vertical once-through pump aeration apparatus having a pump casing swing mechanism is installed in a fish tank. (A) is a front view, (b) is sectional drawing of the YY arrow of (a). (Example 5)

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3 show aeration-related, FIG. 4 shows culture tank-related, and FIGS. 5 and 6 show aquaculture-related.

FIG. 2 is a first embodiment of the present invention, and shows a form in which a once-through pump aeration device 55b is installed in a rectangular aeration tank 20. FIG. (A) is a top view, (b) is a side sectional view. In the rectangular aeration tank 20, a once-through pump aeration device 55b driven by the underwater motor 12b is installed on the bottom of the aeration tank, and the entire pump casing is centered on the rotation axis by a rotation transmission mechanism such as a planetary gear. It is a device that allows fine bubbles to be supplied along with the water flow throughout the tank by periodically changing the discharge direction so that it can swing at a predetermined angle. The angle θ of the periodic change of the discharge flow is obtained by a swing mechanism around the rotation axis of the pump casing. Air is supplied into the hollow rotary shaft 3 from the air pump 11 by the hose 13 inside the pump impeller as shown in FIG. 1, and the diffuser holes 5 drilled in the outer peripheral portion of the hollow rotary shaft inside the impeller. Is supplied as fine bubbles with rotation.

According to this embodiment, unlike the prior art, the flow supplied by the once-through pump aeration device 55b swings the pump casing and periodically changes the discharge direction, so that it is uniform over a wide range. Thus, since a wide water flow containing microbubbles can be supplied over the entire processing tank, the efficiency of aeration is good. Accordingly, the processing time can be shortened.

FIG. 3 is a second embodiment of the present invention, and shows a mode in which two cross-flow pump aeration devices 55b similar to those of the first embodiment of FIG. 2 are installed in a rectangular aeration tank 20. (A) is a top view, (b) is a side sectional view. By installing two units in the aeration tank, a flow containing microbubbles can be supplied to the entire tank without stagnation, so that the function of aeration can be improved. The number of pumps is adjusted according to the size of the processing tank. The functional configuration of the aeration such as the change in the discharge direction due to the swing of the pump casing is the same as that of the first embodiment of FIG.

FIG. 4 shows a third embodiment of the present invention, and shows a mode in which two once-through pump aeration devices 55b are installed on the bottom surface of the culture tank 21. FIG. (A) is a top view, (b) is a side sectional view. This apparatus has a structure in which a hydroponic cultivation float 35 for growing the plant 30 is floated on the water surface of the culture tank 21, and two once-through pump aeration devices 55b are installed on the bottom surface under the water surface. As shown in FIG. 1, the air is supplied from the air pump 11 to the hollow rotary shaft 3 by the hose 13, and the microbubbles are rotated while rotating from the diffuser holes 5 drilled in the hollow rotary shaft inside the impeller. Supplied. The culture solution is supplied from the same air diffuser 5 by the liquid pump 11b, and an environment suitable for plant cultivation can be obtained.

According to this embodiment, the microbubbles and the liquid atomized culture solution are floated on the water surface of the culture tank 21 together with the discharge flow of the pump by the swing by the casing swing mechanism of the once-through pump aeration device 55b. In addition, it can be efficiently supplied over the entire hydroponics float 35. As described above, the angle θ of the periodic change in the direction of discharge flow is obtained by a swing mechanism around the rotation axis of the pump casing. Even if there is no stirrer as in the prior art, the entire tank can be stably supplied.

  As another example of use, it is effective if the once-through pump aeration apparatus of the present invention is used for the growth culture of algae that is attracting attention as marine biomass. In FIG. 4, the hydroponic cultivation float 35 is removed, or a net-like one for algae growth is attached instead, and the carbon dioxide-containing gas is supplied from the air pump 11 in the algae culture tank having the same configuration as the above. The fine bubbles of the carbon dioxide-containing gas are supplied from the pump discharge port into the tank by discharging from the diffuser holes 5 through the hollow rotating shaft 3 shown in FIG. 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. 5 is a fourth embodiment of the present invention, and shows a mode in which a once-through pump aeration device 55b is installed in the fish tank 22. (A) is a top view, (b) is a YY arrow sectional drawing. The once-through pump aeration device 55b is installed under the water surface on one wall surface side of the rectangular fish tank 22 so that a wide water flow with fine bubbles can be supplied over the entire tank. The angle θ of the periodic direction change of the discharge flow is obtained by the swing by the swing mechanism about the rotation axis of the pump casing as described above. Air is supplied into the hollow rotary shaft 3 from the air pump 11 by the hose 13 as shown in FIG. 1, and fine bubbles are generated inside the impeller while rotating from the diffuser holes 5 drilled in the hollow rotary shaft. Will be supplied.

According to this embodiment, the direction of the discharge flow supplied by the once-through pump aeration device 55b can be largely changed periodically in the range of the swing angle θ by the swing by the swing mechanism of the pump casing, so that it is efficient. A wide water flow with fine bubbles can be supplied to the entire tank. It is better to be able to change the swing according to the breeding situation of the fish.

FIG. 6 is a fifth embodiment of the present invention and shows a mode in which a vertical pump aeration device 55c is installed in a fish tank 22. (A) is a front view, (b) is a YY arrow cross-sectional view. This embodiment is characterized in that the cross-flow pump main body is installed vertically as shown in FIG. 6, unlike the fourth embodiment of FIG. In the vertical installation, since the driving motor 12 can be installed above the water surface, installation and maintenance are easy. The functional configuration of the aeration, such as the change in the discharge direction due to the pump casing swing, is the same as that of the fourth embodiment of FIG.

  In summary, it can be seen that the pump aeration apparatus of the present invention can contribute as aeration technology in a wide range of fields such as aeration, aquaculture, culture tank related and the like.

  The aeration technology of the present invention is a discharge flow including a large amount of fine bubbles by swinging the pump discharge casing by a swing mechanism centering on a rotation shaft by a rotation transmission mechanism such as a planetary gear. Therefore, it can be used more efficiently than the prior art as an aeration supply device related to aeration, aquaculture, plant cultivation and the like.

3 Impeller hollow rotating shaft 5 having air diffuser holes Air diffuser hole 6 Blades 7 Cross-flow pump impeller 8 Casing tongue 9 Pump suction side 10 Pump discharge side 11 Air pump 11b Liquid pump 12 Driving motor 12b Driving underwater motor -T13 13 Hose 15 Pump casing 17 Water surface 20 Aeration tank 21 Culture tank 22 Fish tank
30 Plant 35 Hydroponics Float 50 Crossflow Pump Body 55, 55b, 55c Crossflow Pump Aeration Device
B Microbubbles S Flow ejected from the diffuser holes 5 as microbubbles or liquid particulates θ Swing angle of pump casing

Claims (1)

The impeller has a cylindrical shape and a multi-blade once-through pump (cross-flow pump) impeller having a hollow shaft with air diffusion holes, and air, ozone, and carbon dioxide through a hose connected to the hollow shaft from the outside of the impeller. A cross-flow pump with a structure that can supply carbon and culture solution to the center of the impeller is installed under the surface of an aeration tank, a culture tank, a culture tank, etc. A once-through pump airlation device characterized in that the pump casing is periodically swung around the rotation axis to change the discharge direction so that air can be aerated by microbubbles throughout the tank.

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