KR101920919B1 - Micro bubble generating device for farm - Google Patents

Abstract

The present invention relates to a compact microbubble generation apparatus for fish farms, designed to produce microbubbles by being installed in the fish farms. To this end, the compact microbubble generation apparatus comprises: an underwater pump installed in the water to circulate water in the fish farms; a cylindrical discharge pipe connected to an outlet of the underwater pump by a connection socket; a plurality of screw projections protruding from an inner circumferential surface of the discharge pipe and having a spiral on the surface thereof; an air suction pipe connected to the outlet and exposed to the atmosphere to suck in air; a branch pipe provided on the air suction pipe; an oxygen inlet connected to the branch pipe; and a liquefied oxygen supply unit for supplying oxygen into the air suction pipe through the oxygen inlet.

Description

{Micro bubble generating device for farm}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a micro-bubble generating device, and more particularly, to a small micro-bubble generating device installed in a farm and used for breeding microbubbles to increase the amount of dissolved oxygen.

Generally, aquaculture farms use atmospheric air to supply oxygen in aquaculture.

For this purpose, an aeration device is used which normally makes sufficient contact between the air and water.

The aeration device is a device that absorbs atmospheric air to dissolve dissolved oxygen in the water and dissolves oxygen to dissolve in water. It is installed in water and operates in a manner that generates air bubbles.

However, in order to improve the aeration performance, it is desirable to suck as much air as possible and generate a large amount of bubbles. Also, it is better to divide the bubbles as finely as possible and to have micro or nano size.

This large amount of microbubbles is very small in size, so that the area of contact with water is large and can easily be dissolved in water, buoyancy is very small, and it is held in water for a long time, It is enough to melt in water.

Such a micro bubble generating apparatus has been disclosed to have various shapes and structures. Normally, a venturi tube or an orifice tube for inducing suction of air by lowering the pressure is used. In order to divide the bubble, Screw, spiral blade, etc.) and a perforated plate.

However, existing micro bubble generating devices are mostly large and have a complicated structure.

Therefore, it is difficult to install in small farms because it is large and it is difficult to move to other farms. And because it has a complicated structure, the price of the device is expensive and the cost is too high.

In addition, since only air is used, there is a limit to increase the actual dissolved oxygen amount (DO) even if micro bubbles are generated. In order to overcome this problem, oxygen is injected instead of air, but the actual dissolved oxygen (DO) does not increase significantly.

- Korean Registered Patent No. 10-1324134 (Oct. 25, 2013) "Aeration Treatment Apparatus for Water Treatment Plant" - Korean Registered Patent No. 10-1803071 (2017.11.23) "Aquaculture Aerator"

Accordingly, it is an object of the present invention to provide a small microbubble generator for aquaculture that can simultaneously maximize the amount of dissolved oxygen by simultaneously introducing air and oxygen.

It is another object of the present invention to provide a small microbubble generator for aquaculture which can generate a large amount of powerful microbubbles with small size, simple structure, and small power.

In order to achieve the above object, the present invention provides an apparatus for generating micro bubbles in a farm, comprising: an underwater pump installed in the water for circulating water in the farm; A circular tube-shaped discharge pipe connected by an outlet of the underwater pump and a connection socket; A plurality of screw projections formed on an inner circumferential surface of the discharge tube and having a spiral on the surface thereof; An air suction pipe connected to the discharge port and exposed to the atmosphere to suck air; A branch pipe provided on the air suction pipe; An oxygen inlet pipe connected to the branch pipe; And liquefied oxygen supply means for supplying oxygen into the air intake pipe through the oxygen inlet pipe.

Here, the screw projection may be inclined in a direction in which water flows.

The protrusion height of the screw protrusion may be 26 to 36% of the length of the tube inner diameter.

The screw projections may be arranged in a zigzag form.

Meanwhile, the ratio of the air sucked into the air suction pipe and the oxygen introduced through the oxygen inlet pipe may be 7: 3 to 9: 1.

According to the present invention constructed as described above, the following effects can be obtained.

First, since air and oxygen are supplied simultaneously at a proper ratio, a large amount of microbubbles are generated, and the amount of dissolved oxygen is greatly increased compared with the conventional method.

Second, since a plurality of screw projections protrude at a zigzag and an appropriate height, the number of microbubbles increases so that the ratio of splitting collides with the bubbles so that the bubbles can stay in the water for a longer time. In addition, since the screw projection is inclined, adhesion of floating matters contained in seawater is reduced.

Third, it is not a complicated and expensive structure such as a venturi tube, orifice, perforated plate, etc., but is simple, low in manufacturing cost, and small in size.

Brief Description of the Drawings Fig. 1 is a perspective view showing a small micro bubble generating apparatus for a culture facility according to an embodiment of the present invention.
Fig. 2 is a longitudinal sectional view of the discharge tube of the present invention shown in Fig. 1
FIG. 3 is a cross-sectional view of the discharge tube of the present invention shown in FIG. 1

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

For a better understanding of the present invention, the description with reference to the drawings is not intended to limit the scope of the present invention. In the following description, a detailed description of related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

1 is a perspective view showing a small micro bubble generating apparatus for a culture facility according to an embodiment of the present invention.

The present invention relates to an apparatus capable of greatly increasing the dissolved oxygen amount (DO) in aquaculture water by simultaneously introducing air and oxygen into the water of a farm and generating a large amount of micro bubbles. And may include an ejection pipe 200, a screw projection 300, an air suction pipe 400, a branch pipe 500, an oxygen inlet pipe 600, and a liquefied oxygen supply means 700.

First, the submersible pump 100 circulates water installed in the water of the farm 10.

The underwater pump 100 includes a housing 120 that covers a motor 110 and an impeller (not shown), a motor 110 and an impeller, a suction port or a suction hole formed at one side of the housing 120, And a discharge port 140 provided on the other side of the housing 120 to discharge the inhaled water.

The discharge pipe 200 is a circular pipe connected to the discharge port 140 of the underwater pump 100 and discharging water discharged from the discharge port 140 into the aquaculture plant 10.

The discharge pipe 200 may be connected to the discharge port 140 by a separate connection socket 150.

The inner diameter of the discharge pipe (200) is equal to or substantially the same as the inner diameter of the discharge port (140). That is, it is not a structure of an orifice or a venturi tube as in the prior art, but a straight tube having a constant inner diameter over the entire length.

Of course, if the outer diameter of the discharge port 140 is larger than the outer diameter of the discharge pipe 200, the connection socket 150 may be used to induce the inner diameter to gradually decrease, thereby using the venturi pipe.

For reference, the material of the discharge pipe 200 may be a synthetic resin.

Next, a plurality of screw projections 300 are formed on the inner circumferential surface of the discharge pipe 200. 2 and 3 together. Fig. 2 is a vertical sectional view of the discharge tube of the present invention shown in Fig. 1, and Fig. 3 is a transverse sectional view of the discharge tube of the present invention shown in Fig.

The screw projection 300 protrudes from the inner circumferential surface of the discharge tube 200 toward the center of the inner diameter of the discharge tube 200. A spiral is formed on the surface.

The screw protrusion 300 may be formed by passing a bolt through an outer circumferential surface of the discharge pipe 200. The use of bolts has the advantage of being able to be tightened or detached.

At this time, the screw projections 300 are arranged in a line at regular intervals along the inner circumference of the discharge pipe 200, and are spaced apart from each other by a predetermined distance along the longitudinal direction of the discharge pipe 200, (200) inner circumferential circumference.

At this time, the screw projections 300 arranged in two adjacent rows are arranged in a zigzag manner. That is, the screw projections of the adjacent columns are positioned between the two screw projections of any row. This is to cause as much collision as possible with the water flowing in the discharge pipe 200.

The surface of the screw projection 300 is not smooth, but a spiral is formed in order to induce more turbulent flow in a collision. Therefore, the bubbles containing air or oxygen contained in the water collide with each other, so that the bubbles can be further broken and finely divided.

However, in the case of a seawater farm, various floats are contained in seawater. When the seawater is ejected through the ejection pipe 200, a part of the float is caught by the screw projection 300, and when the suspension is continuously adhered, there arises a problem that the outer diameter of the screw projection 300 becomes large. This can clog the spout tube.

In order to solve this problem, the screw projections 300 may be inclined in a direction in which water flows. The inclination angle s of the screw projection 300 is preferably 0 to 45 degrees with respect to the inner diameter direction of the discharge tube 200. [ If it is larger than 45 °, the collision effect with bubbles will be greatly reduced.

Preferably, the projection height (length) of the screw projection 300 may be 26 to 36% of the length of the inner diameter (d) of the discharge pipe 200. Here, the projection height or projection length means a vertical distance from the inner circumferential surface of the discharge tube to the end of the screw projection.

For example, when using an ejection tube having an inner diameter of 30 mm, the projecting length (h) of the screw projection may be 8 to 11 mm.

If the protrusion length h of the screw projection 300 is less than 26% of the inner diameter of the discharge tube 200, the collision effect is drastically reduced and generation of micro bubbles is greatly reduced.

Conversely, if it is greater than 36%, the collision effect does not change much, but the flow of water is disturbed and the circulation is slowed down.

When the screw projection 300 is inclined, the projection height h of the screw projection 300 may be 26 to 36% of the inner diameter of the discharge tube 200 as shown in FIG.

Next, a description will be given of a configuration in which air and oxygen are supplied to the discharge pipe 200.

One end of the air suction pipe 400 is connected to the discharge port 140 of the underwater pump 100 and the other end is exposed to the atmosphere.

Therefore, when water flows at a high speed through the discharge port 140, the pressure inside the discharge port 140 is lowered, thereby sucking air from the outside. The sucked air is mixed with water and moved to the discharge pipe 200.

A branch pipe 500 is provided in the middle of the air suction pipe 400.

In the present invention, the branch pipe 500 has a "T" shape so that air and oxygen are separated from each other, But it is a composition for merging into one.

The oxygen inlet pipe 600 is connected to the branch pipe 500 and the oxygen inlet pipe 600 is connected to a separate liquefied oxygen supplying means 700 so as to be connected to the branch pipe 600 through the oxygen inlet pipe 600, The oxygen can be introduced into the chamber 500.

The liquefied oxygen supplying means 700 may be a liquefied oxygen tank, and a separate oxygen valve 710 may be provided in the oxygen inlet pipe 600 to supply an appropriate amount of oxygen.

It is preferable that the amount of oxygen injected through the oxygen inlet pipe 600 is smaller than the amount of air sucked through the air suction pipe 400.

Specifically, the ratio of the amount of air sucked into the air suction pipe 400 to the amount of oxygen flowing through the oxygen inlet pipe 600 is preferably 7: 3 to 9: 1.

Experimental results showed that the amount of dissolved oxygen was the best when the amount of air: oxygen = 8: 2.

<Experimental Example>

We tested three cases to compare performance with the existing one.

(1) When only air is sucked, (2) When only oxygen is injected, and (3) When air and oxygen are appropriately injected. In each case, the result of measurement of dissolved oxygen after a certain time is as follows.

For reference, the dissolved oxygen (DO) of normal seawater is 6.5 ppm.

DO measured value Remarks Inhale only air 7.0 ppm Air 100% Only oxygen 8.4 ppm Oxygen 20 to 30% Air and oxygen are put in the proper ratio 11.3 ppm Air: oxygen = 8: 2

According to the experimental results, the amount of dissolved oxygen does not increase significantly when air is sucked in. The amount of dissolved oxygen is increased to some extent when only oxygen is added. If the amount of oxygen is increased, the amount of dissolved oxygen may increase, but this is not preferable because there is a cost problem.

On the other hand, it can be seen that the amount of dissolved oxygen is greatly increased when air and oxygen are introduced at an appropriate ratio as in the present invention.

This has the effect of increasing the oxygen content in the air as it results in the addition of additional oxygen to the existing air (typically 21% oxygen and 78% nitrogen).

That is, when only air is sucked, a large amount of air generates bubbles. The bubbles are finely divided while colliding with the screw protrusions 300 while passing through the discharge pipe 200, and the spirals formed on the screw protrusions 300 The bubbles collide with each other and collapse into micro or nano bubbles. And the microbubbles stay in the water for a long time and the oxygen contained in them is dissolved in the water.

When only oxygen is injected, a relatively small amount of oxygen is injected because the same amount of oxygen can not be supplied. This reduces the number of bubbles and naturally reduces the number of bubbles that collide with the screw projections. Therefore, the bubbles that are finely divided are also reduced, and microbubbing as a whole is reduced, so that the amount of dissolved oxygen can not be greatly increased even if only oxygen is supplied.

However, when air and oxygen are simultaneously supplied as in the present invention, a large amount of air and oxygen form a sufficient bubble, and the micro bubbles are sufficiently generated due to the collision between the screw projection 300 and many bubbles. Also, the amount of oxygen contained in the microbubbles is larger than that in the case where only air is sucked, so the amount of oxygen dissolved in the water also increases. As a result, the amount of dissolved oxygen can be greatly increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

10: The farm
100: Submersible pump 110: Motor
120: housing 130: suction hole
140: Outlet 150: Connection socket
200: Discharge tube
300: Screw projection
400: air suction pipe
500: Branch engine
600: Oxygen inlet pipe
700: liquefied oxygen supply means 710: oxygen valve

Claims (5)

An apparatus for generating microbubbles in a farm, comprising:
An underwater pump installed in the water to circulate the water in the farm;
A circular tube-shaped discharge pipe connected by an outlet of the underwater pump and a connection socket;
A plurality of screw projections formed on an inner circumferential surface of the discharge tube and having a spiral on the surface thereof;
An air suction pipe connected to the discharge port and exposed to the atmosphere to suck air;
A branch pipe provided on the air suction pipe;
An oxygen inlet pipe connected to the branch pipe;
And liquefied oxygen supply means for supplying oxygen into the air intake pipe through the oxygen inlet pipe,
The screw protrusions are formed to be inclined by 0 to 45 degrees in a direction in which water flows,
Wherein the ratio between the air sucked into the air suction pipe and the oxygen injected through the oxygen inlet pipe is 7: 3 to 9: 1. delete The method according to claim 1,
And the projecting height of the screw protrusion is 26 to 36% of the length of the inner diameter of the discharge tube. The method of claim 3,
Wherein the screw projections are arranged in a zigzag shape. delete

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