JPH05123080A - Aeration device also used for producing liquid flow - Google Patents

Abstract

PURPOSE:To obtain the title device useful for a water tank for live fishes capable of efficiently stirring liquid and transporting by pressure, equipped with an aeration device of introducing air by taking advantage of negative pressure occurring on the back of a revolving impeller and with a liquid flow producing impeller attached to the same shaft to which the above-mentioned impeller is fixed. CONSTITUTION:The objective device equipped with a self-sucking type aeration device of introducing air by taking advantage of negative pressure occurring on the back of a revolving impeller 7 and with a liquid flow producing impeller 10 attached to the same shaft to which the impeller 7 of the aeration device is fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration device that also serves to generate a liquid flow. More specifically, the present invention relates to an apparatus that can efficiently stir or pressure-feed a liquid while generating fine bubbles in the liquid.

[0002]

2. Description of the Related Art An aeration device for introducing gas such as air into a liquid is widely used in live fish tanks, sewage tanks, and activating devices for lakes and the like. When these water tanks are small, agitation is performed only by the aeration device to some extent, but when the device becomes large, agitation is not sufficiently performed and liquid flow does not occur. Therefore, in the live fish tank and the like that are currently put into practical use, in addition to an aerator for supplying oxygen, a liquid flow generator for circulating and pumping the liquid in the tank is separately provided. Therefore, there is a problem that the device becomes large. Therefore, an object of the present invention is to provide a simple device that can perform aeration and liquid flow in a water tank.

[0003]

SUMMARY OF THE INVENTION The present inventors have installed a simple aerator, which has already been developed by one of the present inventors, by mounting an impeller for liquid flow generation coaxially with the impeller for introducing gas, thereby reducing the size of the apparatus. We succeeded in reducing the weight and completed the present invention.

That is, according to the present invention, a self-priming aerator for introducing air by utilizing the negative pressure generated on the back surface of a rotating impeller, and a liquid flow generating impeller mounted coaxially with the impeller of the aerator. And an aeration device that also functions as a liquid flow generator.

[0005]

The structure of the present invention will be described below with reference to the accompanying drawings showing an embodiment. The aeration apparatus of this embodiment is shown in FIG.
FIG. 1A is a front sectional view, and FIG. 1B is AA of FIG. 1A.
As shown in the cross-sectional view, a rotatable drive shaft 6, an impeller 7 fixed to the lower part of the drive shaft along the drive shaft 6, a lower end of the drive shaft 6, and a gap 8 between the upper end of the impeller 6 and the drive shaft 6. It is composed of an outer pipe 9 which penetrates the shaft 6 with a space therebetween.

An impeller 10 for coaxially generating a liquid flow is installed coaxially at the lower end of the impeller attached to the drive shaft 6, and the impeller 10 sucks the water in the water tank 2 when the impeller 10 rotates. It is covered with an outer cylinder 13 having a mouth 11 and a discharge port 12 for discharging the sucked water. The outer cylinder 13 is connected and supported to the outer pipe 9 by four support rods 14a, 14b, 14c and 14d. ing.

When the drive shaft 6 is rotated by the rotation of the motor 15 as a power source and the impeller 7 rotates, a negative pressure is generated on the back surface of the impeller 7. Air is sucked from the space 16 between the motor 15 and the outer pipe above the outer pipe 9 toward this negative pressure, and bubbles are intensely generated. The bubbles diffuse out of the frame formed by the outer pipe 9, the support rods 14a to 14d, and the outer cylinder 13 and spread to the entire upper area around the outer pipe 9 and rise.

On the other hand, the rotation of the impeller 10 at the lower end of the drive shaft 6 produces a liquid flow in which water is sucked from the suction port 11 of the lower outer cylinder 13 of the aeration device 4 and discharged from the discharge port 12. That is, the lower outer cylinder portion of the aeration device 4 functions as a pump that generates a liquid flow. The liquid flow generated here may be circulated in the water tank as it is to agitate the water tank, or a pipe (not shown) connected to the discharge port 12 may be guided to the outside for purification treatment and then in the water tank. May be recycled.

[0009]

[Modification of aeration device] As the air introduction part of the aeration device of the present invention, a system in which air is sucked toward the negative pressure generated on the back surface of the impeller can be used. Air is sucked in through the hole of the cylindrical pipe (Japanese Patent Laid-Open No. 59-160516), and a gas ejection hole is formed in the back of the hollow box type impeller fixed to the ventilation hole of the cylindrical pipe ( Japanese Patent Laid-Open No. 59-203693), one in which a gas ejection port is mounted in a spiral shape on a cylindrical pipe along the back surface of the impeller spirally mounted on the cylindrical pipe (Japanese Patent Laid-Open No. 60-114331), etc. A device developed by the inventors can be used.

All of these aeration devices are self-priming type,
A large amount of gas can be generated in the liquid as ultrafine air bubbles, and because of the structure that applies the negative pressure generated on the back surface of the impeller in the rotating direction, a strong vacuum pressure is generated in the liquid and the gas can be generated with a small energy. Can be sucked into the liquid, and because air is atomized into the liquid to mix it in the liquid, the efficiency of oxygen dissolution can be increased.It has an extremely simple structure, can be easily disassembled and assembled, and is oil-free. Since it is a mold, it has excellent features such as being extremely easy to handle.

A specific example using the apparatus of the present invention will be described. 2 (a), (b) and (c) are a plan view, a front sectional view and a side sectional view of an example of a container system for transporting live fish which incorporates the device of FIG. The container 1 is composed of a water tank portion 2 for storing live fish and a septic tank portion 3, and the septic tank portion 3 has an aeration device 4 of the present invention which also functions as a liquid flow generator.
And a filtering device 5 are provided.

As described above, air bubbles are generated when air is sucked from the space 16 between the motor 15 and the outer pipe above the outer pipe 9 toward the negative pressure generated on the back surface of the impeller 7 due to the rotation of the impeller 7. Is the outer pipe 9 and the support rod 14a
.About.14d and the outer cylinder 13 diffuse to the outside of the frame and spread to the entire upper area around the outer pipe 9 and rise. Air bubbles are collected around the outer pipe by the shade-shaped baffle 17 (see FIGS. 2 (b) and 2 (c)) while adsorbing organic substances derived from live fish feed and excrement on the surface and along the outer pipe. The air is discharged from the upper part of the baffle plate 17 through the bubble outlet part 18.

The aeration device 4 storage part and the filtration device 5 storage part of the septic tank part 3 are partitioned by a partition plate 19 whose lower end is opened with a constant width, and a partition wall 20 between the filtration device storage part and the water tank part is provided. A large number of holes 21 are provided in the upper part.

The liquid flow due to the rotation of the impeller 10 at the lower end of the drive shaft 6 passes through the lower opening area of the partition plate 19 and the filter medium portion of the filtering device 5, and then the hole 2 of the partition wall 20.
Return to the water tank section 2 through 1. That is, the water in the water tank portion 2 flows from the suction port 11 of the lower outer cylinder 13 of the aeration device 5 to the discharge port 12 thereof.
The filter medium portion of the filtration device 5 is raised, passes through the hole 21, and is circulated to the water tank portion 2.

The filter medium used in the filtration device is a zeolite for adsorbing nitrogen-containing compounds such as ammonia, culturing nitrifying bacteria, breeding, activated carbon and ceramics, bakhan stone for mineral water, and a filter for removing solid matters. Materials such as cloth may be used in an appropriate combination. For example, a combination in which granular zeolite, granular bacterite and granular activated carbon are installed in three stages on the filter cloth from below can be used.

[0016]

The present invention provides a self-priming aerator in which air flows toward the negative pressure generated on the back surface of an impeller, and an aerator which is equipped with an impeller for liquid flow generation and also serves as liquid flow generation. Is.

According to the apparatus of the present invention, it is not necessary to provide a separate liquid flow generator for circulating and pumping the liquid in the water layer, and the apparatus is small, lightweight, and space-saving. Supply and liquid pumping and circulation can be done at the same time, for example, oxygen can be supplied and water flow can be generated at the same time in the live fish tank. Oxygen supply, water flow generation and circulation, and separation of bubbles generated by one device. As a result, effects such as the ability to remove harmful gases, suspensions, organic substances, harmful bacteria, etc. in water are achieved.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view (a) and an AA cross-sectional view (b) of an example of an aeration device that also serves to generate a liquid flow according to the present invention.

FIG. 2 is a plan view (a) of a live fish transport container system using the aeration device of the present invention that also serves as a liquid flow, and BB thereof.
It is sectional drawing (b) and CC sectional drawing (c).

[Explanation of symbols]

 1 Container 2 Water Tank Section 3 Purification Tank Section 4 Aeration Device 5 Filtration Device 6 Drive Shaft 7 Impeller 8 Gap 9 Outer Pipe 10 Impeller (for Liquid Flow Generation) 11 Water Intake Port 12 Water Outlet 13 Outer Cylinder 14a Support Rod 14b Support Rod 14c Support bar 14d Support bar 15 Motor 16 Space part 17 Baffle plate 18 Bubble outlet part 19 Partition plate 20 Partition wall 21 Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiro Maruyama 296-B33-1, Tsutsumi, Chigasaki-shi, Kanagawa Prefecture (72) Inventor Saburo Sato 5-22-7 Kamitada, Nakano-ku, Tokyo

Claims (1)

[Claims] 1. A self-priming aerator that introduces air by using a negative pressure generated on the back surface of a rotating impeller, and an impeller for liquid flow generation that is mounted coaxially with the impeller of the aerator. Aeration device that also functions as a liquid flow generator.