JP2002263678A - Device for producing water which contains fine air bubble - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device for producing bubble-containing water which can make air bubbles more minute by employing a means for breaking the air bubbles more finely and mix the fine air bubbles uniformly with the flow when generating a flow which contains fine air bubbles for purification of a sludge tank or the like. SOLUTION: The device for producing bubble-containing water is equipped, at the lower end of the hollow cylinder 11, with an air blow-off pipe 13, a guide vane 14 which guides a water stream to the inside and makes it into a helical ascending flow, and a bubble breaking means 16 for making the air bubbles contained in the stream finer. The bubble breaking means 16 is constituted by providing a large number of protrusions 15 on the outer peripheral surface of a cylindrical body 16' which has a diameter smaller than that of the hollow cylinder 11. A helical water flow is generated in the annular space S between the bubble breaking means 16 and the hollow cylinder 11, the fine air bubbles are mixed to the flow, and the resultant water flow is discharged upwards.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bubble water generating apparatus for generating fine bubble water for purifying dirt such as factory wastewater.

[0002]

2. Description of the Related Art When a river or a factory drainage channel is contaminated, the most common method of purifying the dirt is to grow the microorganisms in the polluted water and digest the microbial components. is there. In such a treatment method, it is effective to mix fine bubbles with polluted water by an aeration device in order to propagate microorganisms, and to prepare an environment where microorganisms can easily survive. Various types of aeration devices are known. In particular, a type in which a flow of air and water is introduced into a pipe and a flow of microbubble water is generated therein is called an aerator. Representative examples are shown in FIGS.

[0003] A conventional aerator A is installed at an appropriate position on the lower bottom of a sludge pond and sludge tank to be purified, not shown, and has a hollow cylindrical shape as shown in the figure. The pipe 1 (1B, 1a to 1f) is provided with a blow-off pipe 3 for sending air upward from the lower end 2 thereof. The upward flow is swirled by a guide 4 provided inside the pipe portion 1B, and the pipe portions 1a to 1f are stacked on the pipe portion 1B in multiple stages.

[0004] The guide 4 mounts the two meniscuses in the pipe section 1B with opposite inclinations, and serves to impart a swirling motion to the upward flow. The pipe portions 1a to 1f provided in multiple stages have the same shape every other portion, and a plurality (six in the illustrated example) of protrusions 5 projecting toward the center in the radial direction at a pitch of 60 ° on the inner circumference of each pipe. Are formed integrally with the pipe member, and the pipe portions are stacked in multiple stages so that the projections are different by 30 ° for each stage. The protrusions 5 have a ball 5a formed at the tip of a round bar, extend to a position where a curve passing through the center of the balls 5a has a predetermined radius circle, and the central portion is a hollow space. .

[0005] Each of the pipe portions 1a to 1f is shown in FIG.
As shown in (1), rectangular flanges 6 are formed at both ends of the short pipe, and a tightening bolt 7 is inserted into a hole 6a provided at a corner of each flange 6. A fastening bolt 7 is attached to a flange (not shown) having the same shape as the flange 6 formed at the upper end of the pipe portion 1B.
Into the pipe portion 1a ~
1f is attached to the pipe section 1B.

[0006] In the aerator having the above-described structure, the blow-out pipe 3
An upward flow is formed by the air discharged from the air, and the upward flow in which the air and water are mixed becomes a swirling flow by the action of the guide 4,
When passing through the upper half pipe portions 1a to 1f, the air bubbles contained in the upward flow are crushed into fine bubbles by colliding with a number of protrusions 5. It rises and turns in a sludge pond or sludge tank, supplying oxygen to the microorganisms living in the sludge water to activate these microorganisms. The activated microorganisms decompose various substances in the sludge to remove the contaminants.

[0007]

The above-described aerator type aeration apparatus is of another type, for example, a nozzle type in which mixed bubbles are ejected from a nozzle, or a stirring type in which mixing blades are rotated by a motor or the like to stir. It is said to be superior in various points as compared with the ones. Generally, the above-mentioned aerator type is more uniform than other types in that it can uniformly stir the entire sludge pond or sludge tank, has high oxygen dissolving efficiency in water, and does not destroy the habitat of microorganisms. Are better. In addition, there are advantages such that clogging hardly occurs, intermittent operation can be performed, the device is robust and durable, maintenance is easy, and operation costs are low.

However, in the aerator described above, the central portion of the projection toward the center side is a hollow space, so that most of the swirling flow may rise while swirling in the hollow space. Even if the part collides with the protrusions and the mixed flow of water and bubbles is finely broken, the ratio of the outer part to the swirling flow is small, so there is a certain limit to the action of breaking the bubble flow into a fine bubble flow There is. Therefore, an aerator system capable of efficiently generating a fine bubble flow is desired.

SUMMARY OF THE INVENTION In view of the above various problems, the present invention provides a bubble water that can effectively collide a swirling flow with a projection to improve the efficiency of bubble micronization and make the living environment of microorganisms higher in dissolved oxygen. It is an object to provide a generation device.

[0010]

According to the present invention, as a means for solving the above-mentioned problems, a hollow cylinder having a predetermined diameter and length is erected, and an air blowing pipe is inserted into a lower end entrance of the hollow cylinder. A guide vane for spirally guiding the water flow and bubble refinement means for acting on a swirling upward flow formed by the guide vane to refine bubbles contained in the flow are provided in this order, The means for forming is provided with a cylindrical body having a smaller diameter than the hollow cylinder, and a plurality of projections provided between the hollow cylinder and the cylindrical body, and makes the swirling upward flow by air from the blow-out tube impinge on the projections to make bubbles finer. Thus, a microbubble water generator was constructed.

The microbubble water generator having the above-described configuration is installed at the bottom of a water tank such as a sludge pond or a sludge tank, and is used for purifying industrial wastewater or sewage caused by river contamination. Into this bubble water generating device, air is sent from an outside to a pipe separately provided on the water bottom by an air pump or the like, and the air is blown out through a blowing pipe. For this reason, an upward flow is generated by the air, and the upward flow sucks the sewage from the lower end opening of the hollow cylinder, and when the air is blown out into the sewage, the upward flow is mixed as bubbles.

The upward flow of the wastewater containing bubbles is pushed upward in the hollow cylinder, becomes a swirling upward flow through the guide vanes, and proceeds toward the bubble miniaturization means. When the swirling upflow proceeds to the bubble refinement means, the flow rises while swirling in the annular space between the cylindrical body and the hollow cylinder, but since the cylindrical body exists at the center side, the swirl upflow is There is no large pressure gradient such that the pressure drops greatly on the center side and the pressure is high on the outside, and the pressure distribution in the annular space does not change significantly inside and outside.

When the swirling upward flow advances in such a pressure distribution state and violently collides with a large number of projections, the projections break up the bubbles and make them finer. And is released from the upper opening of the hollow cylinder. Since this swirling upward flow is released into the tank or the like containing a myriad of microbubbles, it merges with surrounding sewage while swirling, and the fine bubble water having high oxygen solubility is mixed, thereby causing the sewage to flow. Create an environment where aerobic microorganisms can easily survive. Therefore, the entire sewage pond or sewage tank is purified by the action of such microorganisms.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic vertical cross-sectional view of a bubble water generation device (aerator) according to an embodiment, and FIG. 2 is a main vertical cross-sectional view of a main part thereof. As shown in the drawing, the bubble water generation device 10 includes:
An air blow-out pipe 13 is inserted from the lower end 12 of the hollow cylinder 11 having a predetermined diameter and length open at the upper and lower ends so that a part thereof enters the cylinder. A guide vane 14 is provided at a position slightly above the blow-out pipe 13, and a bubble miniaturization means 16 is further provided above the guide vane 14. The guide vane 14 has a plurality of (four in the illustrated example) vertical guide plates 14a on the outer periphery of the inverted conical body 14c, the upper end of which is expanded to a predetermined diameter, and the guide vane 14 is connected to the guide plates and twisted in a curved shape. It consists of a curved guide plate 14b.

The inverted conical body 14c shown in the figure is divided into two parts in the middle in the vertical direction, and is fitted together to be integrally assembled and separable. The lower half of the inverted conical body 14c has a vertical guide plate 14a.
However, a curved guide plate 14b is formed integrally with each half in the upper half. The illustrated vertical guide plate 14a has four guide plates 14a in a cross shape in a sectional view from the axial direction.
Are formed in the radial direction so as to cross each other. A part of the lower end of the curved guide plate 14b in the upper half is vertical so as to be connected to the vertical guide plate 14a, and after the rising portion, the guide plate 14b forms a helically curved surface and extends upward to extend upward. Ends with.

The bubble miniaturization means 16 is fitted in multiple stages (six stages in the illustrated example) and can be assembled and assembled in a short cylindrical body portion 16a to 16a.
6f is fitted to form one cylindrical body 16 ', and a plurality of projections 15 are provided on the outer circumference of each of the cylindrical body portions 16a to 16f at a predetermined angular pitch outward in the radial direction of the cylindrical body 16'. It is provided so as to protrude (in the illustrated example, there are seven protrusions 15 in one columnar portion).

The projection 15 has an inverted triangular cross section in the illustrated example, and can sharply reduce bubbles at an edge portion.
The length is a length corresponding to a gap with the inner surface of the hollow cylinder 11. The shape of the projection 15 may be square, pentagon,
..Various cross-sectional shapes such as polygons, circles, and ellipses can be used. The cylindrical portions 16a to 16f are different from each other only in the arrangement of the protrusions and the fitting holes for fitting each other (six types), but the other shapes are the same including the protrusions 15.

The upper end of the inverted cone 14c at the center of the guide vane 14 is set to be connected to the lower end of the cylindrical body 16 'with the same diameter. A through hole is formed at the center, and a screw rod 17 is inserted into the through hole, and the upper end side is fastened with a nut to form a cylindrical body 16 ′ and a guide vane 14.
Are assembled together. The uppermost cylindrical part 16
A mounting frame 17a is sandwiched between f and the nut, and the mounting frame 17a is fixed to the upper end of the hollow cylinder 11 by welding at both ends in advance. As a result, the cylindrical body 16 ′ and the guide vane 14 assembled together are attached to the hollow cylinder 11.

The mounting frame 17a may be a thin bar that does not obstruct the swirling upward flow flowing upward from the upper end opening of the hollow cylinder 11. The shape and the mounting method are not limited to this mounting frame 17a. Any means capable of attaching the body 16 'to the hollow cylinder 11 can be used.

When assembling and storing the plurality of cylindrical portions 16a to 16f in the hollow cylinder 11, a boss 18 provided at the center of each cylindrical portion, a concave portion provided on the back side thereof, and The small projections 19 provided on one end face (six at a pitch of 60 ° in the illustrated example as shown in FIG. 3) and the corresponding small holes (same number as the small projections 19) provided on the other end face. In this case, it is formed so that it can be assembled. When assembling the plurality of cylindrical portions 16a to 16f, the boss portions 18 of the adjacent cylindrical portions 16a are made to correspond to the concave portions of 16b, and the small projections 19 of 16a are inserted into the small holes of 16b. And press-fit with the same arrangement pitch in the direction, and perform similar fitting with the cylindrical body portions 16b, 16c, and 16c.
, 16d,... To form a cylindrical body 16 '.

The cylindrical body 16 'thus formed is housed in the hollow cylinder 11 as shown in FIG. 1 or 2 and assembled to form a main part of the apparatus. Ribs 21, 21 are attached to the outside of the lower end of the hollow cylinder 11 containing the columnar body 16 ′ in advance, and the ribs 21, 21 are bolted to the connection plates 22, 22. The connection plates 22 and 22 are fixed to a pipe portion 23 that sends air to the blowout pipe 13, and
The main part of the device is attached to a pipe 23 via 1, 21 and connecting plates 22, 22.

The plurality of projections 15, 15... Formed on the plurality of cylindrical portions 16a to 16f, the small projections 19 for fitting with each other, and the small holes are arranged in a plurality of cylindrical portions. 16a to 16f are all the same. For example, the small projections 19, the small holes and the projections 15 are placed at the same position on the reference radial position, the other small projections 19 and the small holes are arranged at a pitch of 60 °, and the other projections 15 are set at 51 °. .43
Are arranged in the same rotational direction at a pitch of °. And
Since all of the plurality of columnar portions 16a to 16f were formed in the same arrangement in such a shape, the columnar portions 16a to 16f were formed.
When each of the projections 16f is fitted with each other and assembled, the angular positions are always shifted little by little so that the projections 15 of all the cylindrical portions do not completely overlap with each other when viewed in the axial direction of the cylindrical body. It is assembled by fitting into the position. In order to achieve such an angular positional relationship, besides the above, for example, the number of the protrusions 15 may be a prime number such as 11, 13, or 17, and the number of divisions of the cylindrical portion may be one less than the prime number. And the projections 15 can be arranged so as not to overlap.

When assembling the cylindrical portions 16a to 16f having a plurality of projections 15 as described above,
If the fitting phase positions of the small projections 19 and the small holes are variously selected, there can be a combination of seven paddles.

Of such combinations, as shown in FIG. 1, adjacent columnar portions 16a and 16b and 16b and 16b
are close to each other and are slightly shifted (8.57 °) in the axial direction, and the curve connecting the projections 15, 15,.
When viewed from below in the axial direction of 6 ′, the direction in which the left-handed screw advances is the combination with the highest bubble miniaturization efficiency. However, in this case, it is assumed that the curved guide plate 14b of the guide vane 14 has a spiral shape in the direction in which the right-handed screw advances. That is, the direction of the twist of the guide vane 14 and the protrusion 1
The twist directions of 5, 15,... May be opposite to each other. Therefore, if the guide vane 14 is spiral in the direction in which the left-handed screw advances, the projections 15, 15,...

The illustrated cylindrical body 16 'is formed of a hard synthetic resin material including the projections 15, the small projections 19, and the guide vanes 14, and the hollow cylinder 11 is made of a stainless steel pipe. However, a cylindrical body or the like may be formed of a material such as stainless steel instead of the synthetic resin material.

When using the bubble water generating apparatus having the above configuration, the apparatus is immersed in a sludge pond in a factory or the like or a water bottom in a sludge tank. When air is sent out from an air pump (not shown) installed outside the sludge pond or sludge tank, and air is blown out from the blow-out pipe 13 through the pipe portion 23,
The flow of water is generated in the hollow cylinder 11 by the pressure of the air,
The water flow absorbs the surrounding waste water from the opening of the lower end 12 of the hollow cylinder 11 (ejector effect), and the water flow flows upward as a rising flow.

The upward flow rises slightly upward from the opening of the hollow cylinder 11 as a flow including air bubbles formed when air is blown to some extent when the air is mixed by blowing air from the blowing pipe 13. This upward flow is divided into a plurality of rows by the vertical guide plate 14a of the guide vane 14 and proceeds to the position of the curved guide plate 14b.
The curved guide plate 14b and the inverted cone 14c at the center thereof
The outer peripheral surface is twisted helically while rising slightly in the radial direction and rises.

At this time, if the air blowing pressure from the blow-out pipe 13 is large and the upward flow velocity is large, the effect of the straightness of the upward flow is strong, so that even if the upward flow has a spiral shape, the torsion rate is low. small, for example increased in a spiral flow indicated by reference numeral L ₁ in FIG. 1. However, increases in a spiral flow as shown twisted by the curved guide plate 14b than the effect of the straightness is blowing pressure becomes smaller with increased L _2. Regardless of the spiral flow, after passing through the guide vane 14, the spiral space largely rotates in the annular space S between the cylindrical body 16 'of the bubble miniaturizing means 16 and the hollow cylinder 11 (twist).
Then, it rises and flows out of the opening at the upper end of the hollow cylinder 11.

When the spiral flow rises while rotating in the annular space S, a number of protrusions 1 on the outer periphery of the cylindrical body 16 'are formed.
The bubbles contained in this water stream are further finely crushed by colliding with 5 .... At this time, since the projection 15 in the illustrated example has a triangular cross section, if the edge portion violently collides with the bubble, the small bubble becomes finer and finer, and is mixed with the flow and rises.

In the example shown in the figure, the direction of the torsion of the spiral flow is the direction in which the right-handed screw advances when the central axis is viewed from below to above, but the multistage cylindrical body portions 16a to 16
are connected by imaginary lines so as to pass through the tips of the projections 15, 15,... arranged close to each other among the projections 15,. Since the projections are arranged in the same direction, the probability that the spiral flow collides with the large number of projections 15, 15,... Is high, and fine bubbles can be efficiently mixed with the flow.

The upward spiral flow formed as described above is:
If the cylinder 16 'is formed without the provision of the cylinder 16', the pressure on the center side decreases and the pressure on the outside increases as the rotation speed increases, but in the illustrated example, the cylinder 1
Due to the presence of 6 ', the upward spiral flow is an annular flow when viewed in a cross section perpendicular to the axis, and the pressure difference is large in the annular space S between the outer periphery of the cylindrical body 16' and the inner diameter of the hollow cylinder 11. Since there are no fine bubbles, the fine bubbles are more uniformly mixed into the flow both inside and outside the radial position, and the oxygen dissolving efficiency is also increased.

FIG. 5 shows a multi-stage cylindrical portion 16a-16f.
When assembling, there is a possibility that the arrangement of the projections 15, 15,... May take various forms. (A) shows the combination in which the protrusions 15, 15,... Of the vertically adjacent columnar portions are spirally arranged in the direction in which the right-handed screw advances. (B) The figure shows the protrusions 15 of the cylindrical body part vertically adjacent to each other,
.. Indicate a combination of arrangements in which, when advancing to the middle position in the direction in which the right-handed screw advances, it changes in the direction in which the left-handed screw advances. In addition, in the illustrated example, the projections 15, 15,...
Are provided for each columnar part, and therefore, there are seven combinations, that is, 5040 combinations.
Regardless of the combination, the arrangement of the projections 15 in the axial direction can be combined so that adjacent ones do not overlap.

In the above embodiment, the plurality of projections 15, 15
... are provided on the outer periphery of the cylindrical body 16 'so as to protrude in the radial direction.
... need not necessarily be fixed to the cylindrical body 16 '.
For example, you may make it fix to the inner periphery of the hollow cylinder 11 similarly to the said embodiment. However, in that case, the cylindrical body 1
6 'is not formed by fitting a plurality of cylindrical portions, but is integrally formed as a whole, and on the contrary, the hollow cylinder 11 is divided into a plurality of pipe portions, and these are fitted by small projections and small holes. Alternatively, the hollow cylinder 11 may be formed. Are fixed in the radial direction of the cylindrical body 16 ', but may not be necessarily in the radial direction but may be formed slightly oblique to the radial direction, for example.

[0034]

As described in detail above, the micronized bubble water generating apparatus of the present invention comprises: an air blowing pipe provided at the lower end of a hollow cylinder; and a guide vane provided in the hollow cylinder.
Since a plurality of projections provided in the radial direction and bubble miniaturization means having a cylindrical body smaller in diameter than the hollow cylinder are provided, a large number of swirling upward flows generated by the guide vanes are generated while traveling through the space between the cylindrical body and the hollow cylinder. The bubbles collide with the projections and are micronized, and the micronized air bubbles are uniformly mixed with the swirling upward flow, whereby a high-efficiency and high oxygen-soluble swirling upward flow can be generated, and the living environment of microorganisms can be improved. It has a very remarkable effect that it can be improved under suitable conditions.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of a bubble water generating apparatus according to an embodiment.

FIG. 2 is a main vertical sectional view of a main part of the above.

FIG. 3 is a cross-sectional view as viewed from arrows IIIa-IIIa and IIIb-IIIb in FIG.

FIG. 4 is an exploded perspective view of a cylindrical portion and a guide vane.

FIG. 5 is an explanatory view of an assembling modification of the projection of the cylindrical body portion

6 (a) is a main vertical sectional view of a conventional aerator, and FIG. 6 (b) is a sectional view taken along line BB in FIG.

FIG. 7 is an external perspective view of a pipe portion of a conventional aerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bubble water generation apparatus 11 Hollow cylinder 12 Lower end 13 Blow-out pipe 14 Guide vane 15 Projection 16 Bubble refinement means 16 'Cylindrical body 17 Screw rod

Claims (5)

[Claims] 1. A hollow cylinder having a predetermined diameter and length is erected, an air outlet pipe is inserted into a lower end of the hollow cylinder, and a guide vane spirally guides a water flow in the hollow cylinder. A bubble refinement means for acting on the swirling upward flow formed in the flow to refine bubbles contained in this flow is provided in this order, and the bubble refinement means has a cylindrical body smaller in diameter than the hollow cylinder, and a hollow cylinder and a cylindrical body. And a plurality of projections provided between the projections, and a fine bubble water generation device configured to make bubbles fine by colliding a swirling upward flow by air from an air outlet pipe with the projections. 2. A method according to claim 1, wherein the plurality of projections are arranged at a predetermined angle on a plurality of circumferences at predetermined intervals in an axial direction of the cylindrical body, and are arranged such that the plurality of projections viewed in the axial direction do not overlap with each other. The apparatus for producing micronized bubbled water according to claim 1, wherein the apparatus is provided. 3. The plurality of protrusions are located at positions different from each other by a predetermined angle in a direction in which a right-handed screw or a left-handed screw advances between adjacent protrusions on an adjacent circumference when viewed in an axial direction from below to above the columnar body. The microbubble water generator according to claim 1 or 2, wherein the generator is provided. 4. The miniaturization according to claim 1, wherein the plurality of protrusions are provided in a space between the hollow cylinder and the cylindrical body in a radial direction of the cylindrical body and on the cylindrical body. Bubble water generator. 5. The microbubble water generation according to claim 1, wherein the guide vanes include a plurality of vertical guide plates and a plurality of curved guide plates connected thereto. apparatus.