JP2675481B2 - Air mixing device for fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration device for supplying oxygen to a waste liquid treatment tank of a fish farm or a chemical plant so that oxygen can be agitated and mixed into a fluid.

[0002]

2. Description of the Related Art In seawater or freshwater fish farms, in order to increase the oxygen concentration in the water, it is common practice to blow high-pressure oxygen from an oxygen cylinder or the like to secure the oxygen necessary for growing a large amount of fish. . Further, some waste liquid treatment tanks of chemical plants and the like have a system in which the waste liquid and oxygen are chemically reacted to reduce toxicity, and in this case also, equipment for blowing high-pressure oxygen into the liquid is provided.

In place of such blowing of oxygen, there is also one that mixes air into the liquid and utilizes the oxygen contained therein. In this case, a system is generally used in which a submersible pump is immersed in the tank and the outside air is sucked in by driving it, or a blower is installed outside the tank to pump air from the outside. .

[0004]

However, in the case of using high-pressure oxygen, the cost is considerably high, and workability is poor in terms of cylinder replacement work. For this reason, it cannot be applied to a large-scale treatment facility, and from the economical point of view, it can hardly be adopted in a fish farm.

Further, in the case of using a submersible pump or a blower, power for driving this is required. Most of these power sources are electric power, but even in fish farms and other equipment, if air is continuously supplied throughout the day,
Its power consumption will be considerably higher and its share of the annual cost will be higher. As described above, even if the air is blown by mechanical drive, there is a great obstacle in terms of economy as in the case of blowing high-pressure oxygen.

[0006] The problem to be solved in the present invention is to provide a mixing device which can economically blow air into a fluid.

[0007]

SUMMARY OF THE INVENTION The present invention is an air-mixing device installed in a fluid for sucking air from the outside and discharging the air into the fluid, the runner being driven to rotate by the fluid supplied from the outside. A stirrer head having a stirrer blade row on the outer periphery forming a flow path of fluid from the runner, an outer sleeve arranged around the stirrer head, and an air suction path communicating with the outer sleeve, A communication end of the suction path to the outer sleeve is provided upstream of the fluid discharge end of the stirring head, and the stirring blade row is provided downstream of the communication end.

[0008]

The runner is rotated by supplying the fluid from the outside, and the supplied fluid is discharged to the outside through the stirring head. Due to the flow of the fluid, the internal pressure of the portion around the stirring head and surrounded by the outer sleeve decreases, air is sucked into the outer sleeve from the air suction path, and the fluid in the outer sleeve is mixed with air. The high-speed fluid that exits the stirring head causes the fluid mixed with air to flow toward the stirring blade row side, where it is stirred and then discharged in the radial direction, whereby air is mixed into the fluid in the processing tank or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional view of an aeration apparatus of the present invention, and FIG. 2 is an exploded perspective view thereof.

The air-mixing device is installed submerged at the bottom of the fish farm or the bottom of the waste liquid treatment tank. The working fluid is sent from above the water surface by utilizing the head difference, and the air is sucked into the water. It is possible to diffuse and mix.

In the figure, a working fluid inlet 1a is provided at the upper end of a hollow cylindrical casing 1, and a working fluid supply pipe 2 is connected thereto. The supply pipe 2 is piped from the water surface, and has an upper end connected to a water storage tank or the like installed on the ground and supplies water at high pressure into the casing 1 due to the head difference.

Inside the casing 1, a bearing box 3 and a guide ring 4 having an axis line in a posture orthogonal to the opening axis line of the inflow port 1a are fixed. The guide ring 4 is connected to one end surface of the bearing box 3, and the casing 1
The bearing box 3 is held in the casing 1 by fixing the guide ring 4 to the side surface of the casing 1, and the inside of the guide ring 4 faces the outside of the casing 1.

The bearing box 3 is formed by protruding a rotary shaft 3b rotatably supported by a bearing 3a into the guide ring 4, and a runner 5 is attached to the tip thereof. The bearing box 3 and the rotating shaft 3b
It is needless to say that a shaft seal is mechanically sealed with an oil seal or the like in the same manner as in ordinary underwater equipment.
On the other hand, the guide ring 4 is formed by arranging guide vanes 4a for allowing water to enter the blade row of the runner 5 at an appropriate inflow angle in the circumferential direction, and is used for general fluid equipment. It is the same.

The runner 5 is integrally formed with a face 5a for guiding the internal flow on the peripheral surface on the tip side thereof, and a blade row 5b is provided on the back side of the face 5a. The axial length from the blade row 5b to the end face of the face 5a is longer than in the case of a normal runner, and it is possible to give a draft to the flow from the blade row 5b.

A stirring head 6 is connected to the face 5a of the runner 5 coaxially with the runner 5. This stirring head 6
Is provided with a cylindrical sleeve 6a and a stirring blade row 6b provided at the tip thereof. The stirring blade row 6b is composed of blades arranged between two flanges 6c and 6d provided at intervals in the axial direction. The flange 6d on the runner 5 side is located away from the outer peripheral surface of the sleeve 6a, and has an annular gap with the sleeve 6a.

Further, an outer sleeve 7 is coaxially arranged around the stirring head 6 and fixed to the casing 1. The outer sleeve 7 has an axial length corresponding to the distance from the end surface of the casing 1 to the flange 6d of the stirring head 6, and a mesh filter 8 surrounding the stirring blade row 6b is connected to the tip of the outer sleeve 7.

An air inlet 7a is provided on the peripheral surface of the outer sleeve 7, and an intake pipe 9 for sucking air from above the water is connected to this. The intake pipe 9 may be a pipe or a hose, and is installed so that its upper end faces the water surface. The air inlet 7a is provided with the stirring head 6 as shown in FIG.
It faces the sleeve 6a and is located at a part away from the flange 6d. Further, the outer sleeve 7 is provided with a plurality of water amount adjusting holes 7b in the circumferential direction. These water amount adjusting holes 7b are provided so that plugs (not shown) can be attached and detached so that the number of them can be changed, and they are used for adjusting the amount of water entering the outer sleeve 7 depending on the use conditions.

The filter 8 comprises a stay 8a arranged in a cylindrical shape and a net 8b stretched only on the outer peripheral surface thereof. In addition, the stirring head 6, the outer sleeve 7 and the net 8 are shown in FIG.
FIG. 3 shows an exploded perspective view of b viewed from a direction opposite to FIG. 2.

Here, since the casing 1 is located at the bottom of the fish farm or the treatment tank, the water fed from the supply pipe 2 to the inside of the casing 1 can be installed by placing a water tank or the like on the water surface. High pressure water can be sent to the casing 1 by the head difference. If the head difference is not sufficient, the head can be supplemented by setting the water tank at a high level and pumping water up to this. Further, when the water in the fish farm or the treatment tank is used, the water may be pumped up using the circulation pump and supplied to the casing 1.

In the above structure, when water is supplied from the supply pipe 2 into the casing 1, the water is supplied to the guide vanes 4
A shock is applied to the blade row 5b of the runner 5 through the
To rotate at high speed. Blade row 5b due to the rotation of the runner 5
The water passing through is pressurized, flows at high speed in the downstream sleeve 6a, and is discharged from its tip.

On the other hand, due to the high-speed flow of water from the tip of the sleeve 6a, the pressure around the sleeve 6a decreases due to the ejector effect. For this reason, the internal pressure of the air inlet 7a portion also decreases, and as a result, air is sucked into the outer sleeve 7 from the intake pipe 9. Then, the sucked air is mixed with water around the outer sleeve 7 and the stirring head 6, and is drawn in the flowing direction of high-speed water discharged from the sleeve 6a. Therefore, the mixed water containing air flows toward the tip side of the stirring head 6, and the flange 6d and the sleeve 6
From between a and toward the stirring blade row 6b. By sucking an appropriate amount of water from the outside through the water amount adjusting hole 7b provided in the outer sleeve 7, it is possible to prevent cavitation and the like due to air inclusion and to prevent a decrease in efficiency.

Further, since the stirring head 6 rotates at high speed integrally with the runner 5, the mixed water discharged from the stirring blade row 6b is vigorously discharged from the filter 8 in the radial direction. Then, by the stirring of the stirring blade row 6b, the bubbles in the water are subdivided, and the contact area between the air and the water can be increased.

As described above, the runner 5 can be rotated at a high speed to suck air, mix bubbles, and disperse the mixed water over a wide range only by sending the water into the casing 1 from above the water. In particular, the subdivision of bubbles by the stirring blade row significantly increases the contact area between air and water, so that absorption of oxygen into water is promoted and water treatment efficiency is improved.

Further, the flow energy of the water discharged from the stirring head 6 by the rotation of the runner 5 can be used for stirring the water in the fish farm or the treatment tank. For example, when the treatment tank has a circular cross section, if the axis of the stirring head 6 is installed so as to be along the inner wall of the tank, the water in the treatment layer will be removed by the high-speed flow of water from the stirring head 6. It can be circulated in a loop.

As described above, not only the mixing of air into water but also the stirring and fluidization of water itself in a fish farm or a treatment tank can be promoted, and oxygen in the mixed air can be distributed in a wide range. .

If the operating water supplied to the casing 1 is pumped by a pump or the like, the device of the present invention can be used even if there is no head difference. For example, by supplying water to a water tank of a truck for transporting live fish or a water tank of a cooling tower for air conditioning of a building, it is possible to mix air into the water in the water tank.

[0027]

According to the present invention, air can be sucked and mixed into the fluid in the processing tank or the like by utilizing the flow energy of the fluid such as the fed water. Therefore, compared with the case where electric power is used as a drive source such as a blower or a submersible pump, economical processing becomes possible, and it can be optimally used especially when operating all day like a fish farm.

Further, not only the air is mixed, but also the fluid itself in the treatment tank is fluidized, so that the distribution of the mixed air in the fluid can be diffused, which is effective for improving the water quality in a fish farm or the like. .

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of an aeration device of the present invention.

FIG. 2 is an exploded perspective view of an air mixing device.

FIG. 3 is an exploded perspective view of the outer sleeve, the stirring head, and the filter as seen from the opposite direction to FIG.

[Explanation of symbols]

 1 casing 1a inflow port 2 supply pipe 3 bearing box 4 guide ring 5 runner 6 stirring head 7 outer sleeve 8 filter 9 intake pipe

Claims (1)

(57) [Claims] 1. An air mixing device installed in a fluid for sucking air from the outside and discharging the air into the fluid, the runner being driven to rotate by a fluid supplied from the outside, and the flow of the fluid from the runner. A stirring head having a stirring blade row on the outer periphery forming a passage, an outer sleeve arranged around the stirring head, and an air suction path communicating with the outer sleeve, and the air suction path to the outer sleeve. An air mixing device for a fluid, wherein a communication end is provided upstream of a fluid discharge end of the stirring head, and the stirring blade row is provided downstream of the communication end.