JP2000061489A - Aeration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively aerate filthy water of high viscosity by using flow velocity energy of flowing water to such air into water and form air bubbles as fine as possible. SOLUTION: An aeration device is installed in a prescribed tank or the like, and an air sucking pipe 8 is arranged to open its opened end to the atmosphere, and through a water supply pipe, pressurized water is fed to a water introducing pipe 1. The pressurized water is further pressurized by the shape of a water introducing guide hole 11 and flows down at a high speed. At this time, air in an air path 21 communicating with the atmosphere through the air sucking pipe 8 is sucked from an air introducing hole 13 by the negative pressure generated in the introducing water flow passage by fluid. Since an air mixing nozzle and an air sucking nozzle are arranged on the upstream side and on the downstream side of the flowing water path respectively, in a flow-down travel of the pressurized water, first, turbulence is generated in the flowing water by particles of water as well as air bubbles of air fed into the flow-down water flow from the air mixing nozzle, and the air bubbles sucked into the flowing water by this turbulence are finely crushed by synergetic effect of flow velocity and turbulence when flowing down at a high speed, and are mixed well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration device, and more particularly to an aeration device in which bubbles introduced into wastewater are efficiently micronized by using the flow-down energy of the fluid to enhance the solubility of oxygen. It is a thing.

[0002]

2. Description of the Related Art Conventionally, in closed water areas such as ponds and lakes, or open water areas such as rivers, aeration has been performed in order to purify water or sewage in the water areas. As this aeration method, a method of stirring sewage with a stirring aerator and forcibly contacting it with air, a fountain method of injecting water into the air to forcibly contact with air, etc. Has been adopted as

[0003]

It is well known that as aeration and aeration of water, the finer the bubbles, the longer the residence time in the wastewater and the better the solubility of oxygen. In the stirring and aeration method, the screw is generally arranged on the water surface or in water, and the sewage is forcibly rotated by a power machine to stir the sewage, so that the atmosphere is supplied and mixed into the sewage. Mechanical drive parts may wear due to intrusion of impurities contained in water or dirty water, or long impurities such as strings may get entangled in the screw shaft and cause malfunction, and regular inspection and maintenance are essential. Further, there is a problem that the crushing force by the screw is also limited to the miniaturization of the air bubbles to be introduced, and a large amount of power is required. In the fountain method, there is a problem that only the water on the surface of the water or on the surface layer close to the surface of the water is agitated and aerated, and in a pond or a tank with a deep water, the agitation and aeration of the entire tank cannot be performed.

In view of the problems of the conventional aeration apparatus, the present invention eliminates the mechanical drive section in water and utilizes the flow velocity energy of flowing water to draw in the air into air as small as possible. It is an object of the present invention to provide an aeration device capable of efficiently aerating sewage and other highly viscous sewage water such as excrement of livestock.

[0005]

In order to achieve the above object, the aeration apparatus of the present invention comprises a water conduit for supplying pressurized water from the end, and a plurality of stages of nozzle members connected to the water conduit. In an aerator composed of a straightening pipe connected to the final stage nozzle member and an outer pipe arranged so as to cover the water guiding pipe, the nozzle member, and the outer circumference of the straightening pipe, one of the liquids flowing down the water guiding passage A ring-slit mixture nozzle that mixes the intake air with the inhaled air and discharges it to the inner peripheral surface of the flow path, and a ring-slit intake nozzle that is formed on the inner peripheral surface of the flowing water channel, and also mix nozzle Is disposed upstream of the intake nozzle.

In the aeration apparatus of the present invention, the air-fuel mixture nozzle is arranged on the upstream side of the flowing water channel, and the intake nozzle is arranged on the downstream side. Therefore, in the downward stroke of the pressurized water, first, the air is supplied from the air-mixing nozzle into the downward water flow. Along with the air bubbles that are generated, turbulence is generated in the running water by the water particles, and the bubbles that are sucked into the running water by this turbulent flow flow at a high speed It will be crushed and mix better.

In this case, the air-fuel mixture nozzle is opened in a ring slit shape on the inner peripheral surface of the flowing water passage at the joint between the water guiding pipe and the nozzle member, and a portion of the pressurized water flowing down in the flowing water passage is introduced. The air-fuel mixture mixed with the air sucked at the negative pressure in the flowing water channel can be discharged into the flowing water channel.

In this aeration device, a part of the introduced pressurized water and the inhaled air are mixed in advance, and then the mixture is discharged from the mixture nozzle into the pressurized water flowing down the flowing water channel. Mixing can be done efficiently.

Further, in this case, the air-fuel mixture nozzle can be formed at a position having a step at the joint between the water conduit and the nozzle member.

In this aeration device, since a step is formed on the upstream side and the downstream side of the air-fuel mixture nozzle position, a negative pressure is likely to occur in the running water flow passage on the downstream side, which causes the pressurized water to flow. Mixing with air is ensured.

Further, in this case, the intake nozzle can be formed at a position having a step at the joint between the nozzle members.

In this aeration device, since a step is formed on the upstream side and the downstream side of the intake nozzle position,
Negative pressure is likely to occur in the flowing water channel on the downstream side, which allows more reliable suction of air into the pressurized water, and the sucked and sucked air flows along the inner surface of the flowing water channel on the downstream side. Flowing down reduces the flow resistance of the pressurized water and allows the pressurized water to flow down at high speed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an aeration apparatus of the present invention will be described below with reference to the drawings. Aeration device A of the present invention
Are to be installed in closed water areas such as ponds and lakes, in open water areas such as rivers and ports, in wastewater storage tanks, in highly viscous waste tanks such as animal excrement, etc. 1. As shown in detail in FIG. 2, while supplying required pressure water from a pump or the like to one end side of the aeration device A, air or pressurized air from the atmosphere is sucked in and finely mixed. Constitute.

As shown in the enlarged view of FIG. 2, the aeration apparatus A uses a water guide tube 1 at one end of a cylindrical outer tube 2 and a megaphone shape at the other end, as shown in the enlarged view of FIG. The straightening pipes 6 are connected to each other, and a plurality of nozzle members 3, 4, 5 having a cylindrical shape between the water guiding pipe 1 and the straightening pipe 6 inside the outer pipe.
(3 stages in the illustrated embodiment) are arranged concentrically in series,
Water is supplied so that required pressure water is supplied from a pump or the like through a water supply pipe connected to this water conduit 1, and an intake pipe 8 open to the atmosphere is connected to the outer pipe 2 to generate in the aeration device. It sucks air by the negative pressure and crushes the intake air from the atmosphere by the flow velocity energy of the pressure water flowing between the water pipe and the nozzle member, and atomizes it and mix it with the pressure water into the tank. It is discharged and stirred and aerated. The pressure water used here is clean water, filtered water obtained by filtering other sewage,
Any water, such as purified water, which does not block the water conduit and the flowing water flow path of the nozzle member, can be arbitrarily used.

A pressure water supply pipe (not shown) can be connected to the end of the water guide pipe 1, and the inside of the water guide pipe 1 has a large inner diameter on the outer end side, that is, the connection side of the pressure water supply pipe, and an inner end side. Forming a megaphone-shaped water guide hole 11 having a tapered surface with a small inner diameter,
Further, on the downstream end side of the water guide hole 11, a straight water guide passage 14 having a constant length and having a straight diameter is formed continuously with the water guide hole 11, and the tapered water guide hole is formed. 11 at the position of the connection between 11 and the water conduit 14
2 is formed, and in the vicinity of the constricted position and in the water conduit 1
An air introduction hole 13 is formed on the 4 side. This air introduction hole 13
Is one or more perforations on the side of the water guide passage of the water guide pipe 1. This is an outer pipe on the upstream side of the first stage nozzle member 3 so as to be able to inhale by the negative pressure generated in the water guide passage. Two
Open in the air passage 21 formed along the inner peripheral surface of the
The air passage 21 at the outer peripheral portion and the water guide passage 14 are electrically connected to each other through the air introduction hole 13.

Further, the peripheral surface portion of the rear end side outer peripheral portion of the water conduit 1 is cut so as to have a predetermined depth over the entire periphery thereof, and the first nozzle member 3 is formed on the outer periphery of the cut recess portion. And the cutting recess covered with the first nozzle member 3 is formed as the gas-liquid mixing chamber 15, and the guiding outer surface formed on the inner peripheral surface is formed on the downstream outer peripheral portion. Water channel 1
4 and the gas-liquid mixing chamber 15 formed on the outer peripheral surface side are provided with water-absorbing holes 16 so as to be electrically connected to each other, and thereby a part of the pressure water flowing down at high speed in the water guide passage 14 is partially discharged. It is taken into the gas-liquid mixing chamber 15.

The first nozzle member 3 has a flat frusto-conical shape (dish shape, bowl shape, etc.) with a center portion bored, and its outer peripheral edge portion 31 is connected to the downstream end surface of the water conduit 1. 2 nozzle member 4
And is fixed so as to be concentric with the water conduit 1 and the second nozzle member 4,
The inner diameter of the water passage hole 32 bored in the central portion is a straight hole having a diameter slightly larger than the inner diameter of the water guiding passage 14 of the water guiding pipe 1, and the central tapered surface portion is opened to the gas-liquid mixing chamber 15. In this way, the intake hole 33 is formed. Due to the intake hole 33, the air chamber 42 formed between the second nozzle member and the downstream side surface of the first nozzle member 3 is electrically connected to the gas-liquid mixing chamber 15, and the air supplied to the air chamber 42 is A part of the gas can be introduced into the gas-liquid mixing chamber 15 through the suction hole 33.

The second nozzle member 4 connected to the downstream end portion of the first nozzle member 3 has a running water flow passage 44 having a straight diameter formed therein, and the upstream end 41 thereof is enlarged. The air chamber 42 is formed in a hollow shape in the inner peripheral surface of the tip portion 41, and the tip portion 41 is further formed.
An air hole 43 is formed in the hole. The air chamber 42 communicates with the air passage 21 formed between the inner peripheral surface of the outer tube 2 and the outer peripheral surfaces of the water conduit 1 and the nozzle members 4 and 5 through the air holes 43. The air hole 43 is opened tangentially in the air chamber formed in the inner circumference of the tip portion to form one or two.
A part of the air in the air passage 21 is pierced as described above and a part of the air in the air passage 21
It is formed so as to be introduced into the inside as a swirling flow.

A ring slit-shaped mixture nozzle 91 is formed between the downstream end surface of the water conduit 1 and the upstream end surface of the first nozzle member 3. This is such that when the first nozzle member 3 is sandwiched and fixed between the water conduit 1 and the second nozzle member 4, a predetermined gap is formed, and the water conduit 14 and the first nozzle member 4 are formed. It is assumed that the nozzle member 3 is formed at a position where there is a step with the water passage hole 32. Further, a ring slit-shaped intake nozzle 92 is similarly formed at a position where a step is formed between the downstream end surface of the first nozzle member 3 and the upstream end surface of the second nozzle member 4. This is done by making the diameter of the intake nozzle 92 a little larger than the diameter of the air-mixing nozzle 91, the inner diameter a of each water guiding passage 14, the inner diameter b of the water passage 32 at the central portion of the first nozzle, and the flowing water passage 44. The inner diameter c, a <b <c
The inner diameter of each is determined so that

At the downstream end of the second nozzle member 4,
The upstream side end of the third nozzle member 5 is fitted and connected. Similar to the second nozzle member 4, the third nozzle member 5 has a straight running water flow passage 54 having an inner diameter d that is slightly larger than the inner diameter c of the running water flow passage 44 of the second nozzle member 4. And an air hole 53 is formed in the outer peripheral surface of the upstream end portion 51 that is connected to the downstream end portion of the second nozzle member 4. The air hole 53 is formed in the second nozzle member 4
And a third nozzle member 5 are connected to each other so as to open in the air chamber 52 formed in a ring shape between the both members and the air passage 21, respectively.
3 is perforated so as to be tangential to the air chamber 52. As a result, the air flowing from the air passage 21 through the air holes 53 into the air chamber 52 becomes a swirl flow, and the air chamber 52 further has a step with the downstream end surface of the second nozzle member 4 at the position where the third nozzle member 5 is located. And a ring slit-shaped intake nozzle 93 formed between the upstream end faces of the above. The inner diameters c and d of the second nozzle member 4 and the third nozzle member 5 are determined so that the diameter of the intake nozzle 93 is larger than the diameter of the intake nozzle 92 arranged upstream, that is, on the upstream side. And

A rectifying pipe 6 is connected to the downstream end of the third nozzle member 5. There is a step between the upstream end of the rectifying pipe 6 and the downstream end of the third nozzle member 5, and the connecting portion connects the second nozzle member 4 and the third nozzle member 5. A ring-shaped air chamber 62 is formed between the both member connecting portions in the same manner as the above portion, and an air hole 63 is formed so as to open to the air chamber 62 and the air passage 21. Further, a ring slit-shaped intake nozzle 94 is formed between the rear end surface of the third nozzle member 5 and the front end surface of the flow straightening pipe 6 having a step. This air hole 63 is bored so as to be tangential to the air chamber 62, so that the air hole 63 is formed from the air passage 21.
The air flowing into the air chamber 62 via the above becomes a swirl flow, and flows into the intake nozzle 94 via this air chamber 62.

The water guide pipe 1 is fixed to one end of the outer pipe 2 by bolting, and the other end of the outer pipe is fixed to the rectifying pipe 6 by screwing. The screw engraved on the inner peripheral surface of the mounting plate 7 fixed by is screwed to the male screw formed on the outer peripheral surface of the rectifying pipe 6 to be fixed. The method of fixing the outer pipe 2, the water conduit 1 and the rectifying pipe 6 can be performed by a method other than the one shown.

Next, the operation of the aeration apparatus of the embodiment of the present invention constructed as described above will be described. The aeration device A is installed in a predetermined pond or a tank, and the air supply pipe 8 is arranged so that the opening tip of the air supply pipe 8 is open to the atmosphere. A pump or a submersible pump is operated and pressurized water is introduced through the water supply pipe. Supply to 1. When the pressurized water flows down through the tapered water guiding hole 11 in the water guiding pipe, it is further pressurized by the shape of the water guiding hole and flows down at a high speed. Since the terminal portion of the water guide hole 11 is connected to the water guide passage 14 through the narrowed constricted position 12, it is exposed to the atmosphere by the negative pressure generated in the water guide passage by the fluid flowing down at high speed. The air in the air passage 21 communicating with the air supply pipe is taken in through the air introduction hole 13. The intake air becomes bubbles and flows down in the water guide passage, and a turbulent flow is also generated in the intake air, and the air bubbles sucked and crushed are mixed with the pressure water flowing down. Further, when the pressure water flowing down in the water guiding passage passes through the air-mixing nozzle 91 having a step, a negative pressure is generated on the downstream side thereof, and the negative pressure causes air and pressure water to flow from the air-mixing nozzle 91. The mixed fluid is sucked.

As for the fluid ejected from the air-fuel mixture nozzle 91, a part of the pressure water flowing down in the water guiding passage enters the gas-liquid mixing chamber 15 through the water absorption hole 16 and the air chamber 42 through the intake hole 33. The air inside is introduced into the gas-liquid mixing chamber 15 to be mixed with air and pressure water. As a result, the mixed fluid of the air bubbles and the pressure water is added to the high-speed pressure water passing through the first nozzle member 3, and the impact force that cannot be obtained only by the bubbles is generated and the introduced bubbles are introduced. Is crushed and miniaturized by this impact force. Further, when the mixed pressure water passes through the intake nozzle 92, the flowing water flow path 4 on the downstream side is formed due to the difference in the flow path diameters on the upstream side and the downstream side of the intake nozzle 92.
Negative pressure is generated in the air passage 4, and the negative pressure also sucks air as bubbles from the intake nozzle 92 through the air passage 21, the intake hole 43, and the air chamber 42.

In this case, the air sucked from the suction nozzle 92 is crushed by the pressure water, and some of the bubbles flow down along with the pressure water along the inner peripheral surface of the flowing water channel. The bubbles along the inner peripheral surface of the flowing water channel serve as a lubricant to reduce the flow resistance of the pressure water, and the mixed pressure water flows down at a high speed.
Similarly, when sequentially flowing down in the nozzle member 5 and the adjusting pipe 6, air is also sequentially sucked from the intake nozzles 93 and 94 by the negative pressure generated in the flowing water flow paths 54 and 64, and the air is crushed and mixed,
It is discharged at a high speed from the downstream end of the flow straightening pipe 6 into the water area.

[0026]

According to the aeration apparatus of the first aspect of the present invention, the air-fuel mixture nozzle is arranged on the upstream side of the flowing water channel and the air-intake nozzle is arranged on the downstream side. Along with air bubbles supplied into the flowing water flow, turbulent flow is generated in the running water by the water particles, and the flow velocity and the turbulent flow of the bubbles sucked into the running water by this turbulent flow at a high speed. Due to the synergistic effect, it is finely crushed and mixed well.

According to the aeration apparatus of the second aspect of the present invention, a part of the pressurized water flowing down in the flowing water channel is opened in the inner surface of the flowing water channel at the joint between the water guiding pipe and the nozzle member in a ring slit shape. Since the air-fuel mixture nozzle is configured so as to discharge the air-fuel mixture that has been introduced and mixed with the air that has been sucked in at a negative pressure in the water-flow passage into the water-flow passage, part of the introduced pressurized water and the air taken in After being mixed in advance, the mixture is discharged from the mixture nozzle into the pressurized water flowing down the flowing water channel to efficiently mix with the pressurized water.

According to the aeration device of the third aspect of the present invention, since the air-mixing nozzle is formed at the position having the step at the joint between the water pipe and the nozzle member, the air-mixing nozzle is located upstream and downstream of the position of the air-mixing nozzle. Since a step is formed on the side, a negative pressure is likely to be generated in the flowing water flow path on the downstream side, whereby the pressurized water and the air are reliably mixed.

According to the aeration apparatus of the fourth aspect of the present invention, since the intake nozzle is formed at a position having a step at the joint between the nozzle members, there is a step on the upstream side and the downstream side at the intake nozzle position. Is formed, negative pressure is likely to be generated in the flowing water flow path on the downstream side, so that air can be more reliably sucked into the pressurized water, and this sucked and sucked air is the inner surface of the flowing water flow path on the downstream side. The flow resistance of the pressurized water can be reduced by reducing the flow resistance of the pressurized water.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of an aeration device of the present invention.

FIG. 2 is a sectional view showing an entire embodiment of the aeration apparatus of the present invention.

[Explanation of symbols] A Aeration device 1 water pipe 2 outer tube 3 First nozzle member 4 Second nozzle member 5 Third nozzle member 6 Rectifier tube 7 Mounting plate 8 intake pipe 11 Water guide hole 13 Air introduction hole 14 Water conduit 15 gas-liquid mixing chamber 16 Water absorption holes 21 air passage 42, 52, 62 Air chamber 44, 54, 64 running water flow path 43, 53, 63 air holes 91 Mixing nozzle 92 Intake nozzle 93 Intake nozzle 94 intake nozzle

Claims (4)

[Claims] 1. A water conduit for supplying pressurized water from the end, a plurality of stages of nozzle members connected to the water conduit, a rectifying pipe connected to a final stage nozzle member, and these water conduits and nozzle members, In an aerator composed of an outer tube arranged so as to cover the outer circumference of the flow straightening tube, a part of the liquid flowing down in the water guiding channel is taken in, mixed with the inhaled air, and discharged to the inner circumferential surface of the channel. An aeration device, characterized in that a ring slit-shaped air-fuel mixture nozzle and a ring-slit-shaped intake nozzle formed on the inner peripheral surface of the flowing water channel are formed, and the air-fuel mixture nozzle is arranged upstream of the intake nozzle. 2. An air-mixing nozzle is opened in a ring slit shape on the inner peripheral surface of the flowing water channel at the joint between the water conduit and the nozzle member,
It is configured such that a part of the pressurized water flowing down in the flowing water channel is introduced and a mixture mixed with the air sucked by the negative pressure in the flowing water channel is discharged into the flowing water channel. Item 1. An aeration device according to item 1. 3. The aeration apparatus according to claim 1, wherein the air-fuel mixture nozzle is formed at a position having a step at the joint between the water conduit and the nozzle member. 4. The intake nozzle is formed at a position having a step at a joint between nozzle members.
The aeration device described.