JP3677516B2 - Fine bubble water generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bubbling water generating device that generates fine bubbling water to purify dirt such as factory waste water.
[0002]
[Prior art]
When a river or factory drainage channel is contaminated, the most common method for purifying the dirt is to propagate microorganisms in the polluted water and digest the pollutants with the microorganisms. In such a treatment method, in order to propagate microorganisms, it is effective to prepare an environment in which microbes can easily survive by mixing fine bubbles with contaminated water using an aeration apparatus. As this aeration apparatus, various types are known, and in particular, a type that guides the flow of air and water in a pipe and generates a flow of fine bubble water inside is called an aerator. Typical examples are shown in FIGS.
[0003]
Although the conventional aerator A is not shown in the drawing, it is installed at an appropriate position on the bottom of the sludge pond and sludge tank to be purified, and the structure thereof is a hollow cylindrical pipe 1 as shown in the figure. (1B, 1a to 1f) is provided with a blower pipe 3 for sending air upward from its lower end 2 to generate an upward flow in the water by the flow of discharged air, and air bubbles are mixed into the pipe portion 1B. The guide 4 provided in the interior is provided with a swirling motion to the upward flow, and the pipe portions 1a to 1f are stacked in multiple stages on the pipe portion 1B.
[0004]
The guide 4 attaches two meniscuses with inclinations opposite to each other in the pipe portion 1B, 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 one, and a plurality of (six in the illustrated example) projections 5 projecting toward the center in the radial direction at a 60 ° pitch on the inner circumference of each pipe. Is formed integrally with the pipe member, and the pipe portion is laminated in multiple stages so that the protrusions are arranged 30 ° different from each other. The protrusions 5... Have a ball 5 a formed at the tip of the round bar, and extend to a position where a curve passing through the center of the ball 5 a. .
[0005]
As shown in FIG. 7, each of the pipe portions 1 a to 1 f is formed with square flanges 6 at both ends of a short pipe, and the fastening bolts 7 are inserted into holes 6 a provided at the corners of the respective flanges 6. Then, the fastening bolt 7 is inserted into a flange (not shown) having the same shape as the flange 6 formed at the upper end of the pipe portion 1B, and the lower end thereof is fastened with a nut to attach the pipe portions 1a to 1f to the pipe portion 1B. .
[0006]
In the aerator having the above-described configuration, an upward flow is formed by the air discharged from the blow-out discharge pipe 3, and the upward flow in which air and water are mixed becomes a swirling flow by the action of the guide 4, and the upper half pipe portion 1a to The air bubbles contained in the upward flow are crushed into fine bubbles by colliding with a large number of projections 5 when passing through If, and further rising from the pipe portion 1f at the upper end to become a sludge pond or sludge tank It turns inside and supplies oxygen to microorganisms that live in the sludge water to activate these microorganisms. The activated microorganisms decompose various substances in the sludge and remove the pollutants.
[0007]
[Problems to be solved by the invention]
The aerator-type aeration apparatus described above has various points compared to other types, for example, a nozzle type that ejects mixed bubbles from a nozzle, or a stirring type that agitates by rotating a mixing blade by a motor or the like. It is said to be excellent. In general, the above-mentioned aerator type can be uniformly stirred over the entire sludge pond and sludge tank, has high oxygen dissolution efficiency in water, and does not destroy the habitat of microbial communities. Are better. In addition, clogging hardly occurs, intermittent operation is possible, the device is robust and durable, maintenance is easy, and operation costs are low.
[0008]
However, in the aerator described above, the central part of the protrusion toward the center is a hollow space, so that most of the swirling flow may rise while swirling in the hollow space, and the outer part of the swirling flow is a protrusion. Even if the mixed flow of water and bubbles is finely crushed due to collision, the ratio of the outer portion 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. Therefore, an aerator system capable of efficiently generating a fine bubble flow is desired.
[0009]
In consideration of the various problems described above, the present invention provides a bubbling water generator that can effectively make a swirling flow collide with protrusions to improve bubble refining efficiency and make the living environment of microorganisms higher in dissolved oxygen. The issue is to provide.
[0010]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention has a hollow cylinder with a predetermined diameter and length, and an air blowing pipe is inserted into the lower end inlet to guide the water flow in a spiral shape. A guide vane and a bubble refining means that acts on the swirling upward flow formed by the guide vane to refine the bubbles contained in the flow in this order, and the bubble refining means is a column whose diameter is smaller than that of the hollow cylinder. Body, and a plurality of protrusions provided between the hollow cylinder and the cylindrical body, and micronized bubble water configured to make bubbles finer by colliding the swirl upward flow caused by air from the blow-out pipe with the protrusions It was a generator.
[0011]
The refined bubble water generating apparatus configured as described above is installed on the bottom of a sludge pond or sludge tank, and is used to purify sewage caused by factory wastewater or river dirt. In this bubbly water generating apparatus, air is sent from the outside to a pipe separately provided on the bottom of the water 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 sewage from the lower end opening of the hollow cylinder, and when air is blown into this, it is mixed as bubbles.
[0012]
The upward flow of the sewage containing bubbles is pushed upward in the hollow cylinder, becomes a swirling upward flow through the guide vanes, and proceeds toward the bubble refining means. When the swirl upward flow advances to the bubble miniaturization means, the flow rises while swirling in the annular space between the columnar body and the hollow cylinder, but since the columnar body exists on the center side, There is no large pressure gradient such that the pressure is greatly reduced on the center side and the pressure is high on the outside, and the pressure distribution in the annular space does not change greatly on the inside and outside.
[0013]
When the swirl upward flow proceeds in such a pressure distribution state and collides violently with many projections, the bubbles are crushed and refined by the projections, so the refined bubbles are uniformly mixed with the flow and swirled upwards And discharged from the upper opening of the hollow cylinder. Since this swirling upward flow contains innumerable microbubbles and is released into the tank, etc., the swirl flows into the surrounding sewage while swirling and mixed with highly oxygen-dissolved microbubble water. Create an environment where aerobic microorganisms can easily survive. For this reason, the whole sewage pond or sewage tank is purified by the action of such microorganisms.
[0014]
Embodiment
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a bubbling water generator (aerator) according to an embodiment, and FIG. 2 is a main longitudinal section of a main part thereof. As shown in the figure, the bubbling water generator 10 has an air blowing pipe 13 inserted from a lower end 12 of a hollow cylinder 11 having a predetermined diameter and length and opened at the upper and lower ends so that a part thereof enters the cylinder. I have. A guide vane 14 is provided at a position slightly above the outlet pipe 13, and a bubble miniaturizing means 16 is further provided thereabove. The guide vane 14 has a shape in which the upper end is expanded to a predetermined diameter and a plurality of (four in the illustrated example) vertical guide plates 14a are connected to the outer periphery of the inverted conical body 14c, and are connected to the guide plates and twisted in a curved shape. It consists of a curved guide plate 14b.
[0015]
The inverted conical body 14c shown in the figure is configured so that it can be assembled and separated as a whole by fitting two parts divided in the middle in the vertical direction, and the vertical guide plate 14a is in the lower half part and the upper half part is in the lower half part. A curved guide plate 14b is formed integrally with each half portion. The illustrated vertical guide plate 14a is formed in the radial direction so that the four guide plates 14a cross in a cross shape in a cross-sectional view from the axial direction. A part of the lower end of the curved guide plate 14b in the upper half is vertical so as to connect to the vertical guide plate 14a, and after passing the rising portion, the guide plate 14b forms a curved surface spirally and extends upward. End with.
[0016]
The bubble refining means 16 is fitted in multiple stages (six stages in the example shown in the drawing), and is fitted with short cylindrical parts 16a to 16f that can be assembled to form one cylindrical body 16 '. 16a to 16f are provided with a plurality of protrusions 15 on the outer periphery at predetermined angular pitches so as to protrude outward in the radial direction of the cylindrical body 16 '(in the illustrated example, the protrusions 15 are formed on one cylindrical body portion. 7).
[0017]
In the example shown in the figure, the protrusion 15 has an inverted triangular cross-section, and can sharpen bubbles at the edge portion. The length of the protrusion 15 corresponds to the gap with the inner surface of the hollow cylinder 11. In addition to the example shown in the figure, the protrusion 15 may have various cross-sectional shapes such as a square, a pentagon, a polygon, a circle, and an ellipse. The cylindrical body portions 16 a to 16 f are different from each other only in the arrangement of the projections and fitting holes for fitting to each other (six types), but other shapes are the same including the projection 15.
[0018]
The upper end of the inverted conical body 14c at the center of the guide vane 14 described above is set to be connected to the lower end of the cylindrical body 16 ′ with the same diameter, and the center of the cylindrical body 16 ′ and the guide vane 14 is at the center. A through-hole is formed, and the screw rod 17 is inserted into the through-hole, and the upper end side is fastened with a nut, whereby both the cylindrical body 16 ′ and the guide vane 14 are assembled together. A mounting frame 17a is sandwiched between the uppermost columnar portion 16f and the nut, and both ends of the mounting frame 17a are fixed to the upper end of the hollow cylinder 11 in advance by welding. The cylindrical body 16 ′ and the guide vane 14 that are assembled together by being inserted and fastened are attached to the hollow cylinder 11.
[0019]
The mounting frame 17a may be a thin bar that does not hinder the swirling upward flow flowing upward from the upper end opening of the hollow cylinder 11, and the shape and mounting method are not limited to this mounting frame 17a, and the column body 16 ′. Any means can be used as long as it can be attached to the hollow cylinder 11.
[0020]
When assembling and storing the multi-stage cylindrical body parts 16a to 16f in the hollow cylinder 11, the boss part 18 provided at the center of each cylindrical body part, the recessed part provided on the back side thereof, and one end surface of the cylindrical body part are provided. Fitting and assembling with the provided small protrusions 19 (six in the example shown in FIG. 3 at a 60 ° pitch) and small holes (the same number as the small protrusions 19) provided on the other end surface corresponding thereto It is formed to be able to. When assembling the multi-stage cylindrical body portions 16a to 16f, for example, the boss portions 18 of the cylindrical body portions 16a adjacent to each other are made to correspond to the concave portions of the 16b, and the small protrusions 19 of the 16a are arranged around the small holes of the 16b. When the arrangement pitches in the direction are matched, press fitting is performed, and the same fitting is performed as cylindrical portions 16b and 16c, 16c and 16d,..., A cylindrical body 16 ′ is formed.
[0021]
When the cylindrical body 16 ′ thus formed is housed in the hollow cylinder 11 as shown in FIG. 1 or 2, and assembled, the main part of the apparatus is formed. Ribs 21 and 21 are previously attached to the outside of the lower end of the hollow cylinder 11 containing the columnar body 16 ′, and the ribs 21 and 21 are bolted to the connection plates 22 and 22. The connection plates 22 and 22 are fixed to a pipe portion 23 that sends air to the blow-out pipe 13, whereby the main part of the apparatus is attached to the pipe 23 via the ribs 21 and 21 and the connection plates 22 and 22.
[0022]
The plurality of projections 15, 15... Formed on the plurality of columnar portions 16a to 16f, and the small projections 19 and small holes for fitting with each other, the plurality of columnar portions 16a to 16f are arranged. Are all the same. For example, the small protrusion 19, the small hole and the protrusion 15 are placed at the same position on the reference radial position, and the other small protrusion 19 and the small hole are arranged at a 60 ° pitch. They are arranged in the same rotational direction at a pitch of .43 °. And since all the some cylindrical body parts 16a-16f were formed by the same arrangement configuration in such a shape, each of the cylindrical body parts 16a-16f is mutually fitted, and when assembling, When the projections 15 are viewed in the axial direction of the cylindrical body, the projections 15 are always fitted and assembled at positions where their angular positions are slightly shifted so as not to completely overlap each other. In order to achieve such an angular position relationship, in addition to the above, for example, if the number of protrusions 15 is a prime number such as 11, 13, or 17, and the number of divisions of the cylindrical body part is one less than that prime number, The arrangement structure can be such that the projections 15 do not overlap.
[0023]
When the cylindrical body portions 16a to 16f having the plurality of projections 15 are assembled to each other and assembled to each other, if the fitting phase positions to the small projections 19 and the small holes are variously selected, combinations of 7 squares are possible. There can be.
[0024]
In such a combination, as shown in FIG. 1, the projections 15 of the adjacent cylindrical body portions 16a and 16b, 16b and 16c... Approach each other and slightly shift in the axial direction (8.57). °) When the phase position and the curve connecting these protrusions 15, 15... Are viewed from the bottom to the top in the axial direction of the cylindrical body 16 ′, the direction in which the left screw advances is the finest of the bubbles. It is considered as a combination with good 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 screw advances. In other words, the twist direction of the guide vane 14 and the twist direction of the protrusions 15, 15. Therefore, if the guide vane 14 is spiral in the direction in which the left screw advances, the protrusions 15, 15...
[0025]
The illustrated cylindrical body 16 ′ is formed of a hard synthetic resin material including the protrusions 15, the small protrusions 19, and the guide vanes 14, and the hollow cylinder 11 is made of a stainless steel pipe. However, instead of the synthetic resin material, a cylindrical body or the like may be formed of a material such as stainless steel.
[0026]
When using the bubbly water generating apparatus having the above configuration, it is used by immersing it 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 blowing pipe 13 through the piping 23, water is put into the hollow cylinder 11 by the pressure of the air. A flow is generated, and the water flow absorbs the surrounding sewage from the opening of the lower end 12 of the hollow cylinder 11 (ejector effect), and the water flow flows upward as an upward flow.
[0027]
The ascending flow rises as a flow containing bubbles that are formed to be broken to some extent when air is mixed by blowing air from the blowing pipe 13 slightly above the opening of the hollow cylinder 11. 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, and the curved guide plate 14b and the outer peripheral surface of the inverted conical body 14c at the center thereof. As a result, it gradually rises in the radial direction while twisting spirally.
[0028]
At this time, when the pressure of the air blown from the blowing pipe 13 is large and the flow rate of the upward flow is large, the effect of the straight flow of the upward flow is strong, so even if it becomes a spiral upward flow, its twist rate is small. It rises as a spiral flow indicated by symbol L ₁ in FIG. 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. In any spiral flow, after passing through the guide vane 14, it rises while rotating (twisting) in the annular space S between the cylindrical body 16 ′ of the bubble miniaturization means 16 and the hollow cylinder 11 in a spiral manner. And flows out from the opening at the upper end of the hollow cylinder 11.
[0029]
When the spiral flow ascends while rotating in the annular space S, it collides with a large number of protrusions 15 on the outer periphery of the cylindrical body 16 ', and bubbles contained in the water flow are further crushed. At this time, since the cross section of the protrusion 15 in the illustrated example has a triangular cross section, when the edge portion violently collides with the bubble, the small bubble becomes finer and finer and is mixed with the flow and rises.
[0030]
Further, in the illustrated example, the twist direction of the spiral flow is the direction in which the right-handed screw advances when the central axis is viewed from the bottom to the top, but it is adjacent to the multistage cylindrical body portions 16a to 16f. When the imaginary lines are connected so as to pass through the tips of the projections 15,... Of the fitting portions 15,... Since these protrusions are arranged on the surface, there is a high probability that the spiral flow collides with a large number of protrusions 15, 15..., And fine bubbles can be mixed into the flow efficiently.
[0031]
If the rising spiral flow formed as described above is generated without providing the cylindrical body 16 ′, the pressure on the center side becomes lower and the pressure on the outer side becomes higher as the rotation rising speed increases. In the example, since the cylindrical body 16 ′ is present on the center side, the rising spiral flow is an annular flow when viewed in a cross section perpendicular to the axis, and an annular space between the outer periphery of the cylindrical body 16 ′ and the inner diameter of the hollow cylinder 11. Since the pressure difference is not large in S, the fine bubbles are more uniformly mixed in the flow both inside and outside the radial position, and the oxygen dissolution efficiency is also increased.
[0032]
FIG. 5 shows the possibility that the arrangement of the protrusions 15, 15... Can take various forms when assembling the multistage cylindrical body portions 16 a to 16 f. (A) The figure has shown the combination arrange | positioned so that the processus | protrusion 15,15 ... of the cylindrical body part adjacent on the upper and lower sides may make spiral form in the direction which a right-handed screw advances. (B) The figure shows a combination of arrangements in which the protrusions 15, 15... Of the cylindrical body parts adjacent to each other in the upper and lower directions change in the direction in which the left-hand screw advances from the middle position in the direction in which the right-hand screw advances. In addition, in the example shown in the figure, since seven protrusions 15, 15... Are provided for one cylindrical body portion, there are 7 combinations, that is, 5040 combinations. In any combination, the arrangement of the protrusions 15 seen in the axial direction can be combined so that adjacent ones do not overlap.
[0033]
In the above embodiment, the plurality of protrusions 15, 15... Are provided on the outer periphery of the cylindrical body 16 ′ so as to protrude in the radial direction. However, these protrusions 15, 15. For example, it may be fixed to the inner periphery of the hollow cylinder 11 in the same manner as in the above embodiment. However, in that case, the cylindrical body 16 'is not formed by fitting a plurality of cylindrical body parts, but is formed integrally as a whole, and conversely, the hollow cylinder 11 is divided into a plurality of pipe parts, The hollow cylinder 11 may be formed by fitting with a small protrusion and a small hole. Further, the protrusions 15, 15... Are fixed in the radial direction of the cylindrical body 16 ′. However, the protrusions 15, 15.
[0034]
【The invention's effect】
As described above in detail, the micronized bubble water generator of the present invention includes an air blowing pipe provided at the lower end of the hollow cylinder, a guide vane provided in the hollow cylinder, and a plurality of radially provided pipes. And a bubble refining means having a cylindrical body having a diameter smaller than that of the projection and the hollow cylinder, so that the swirling upward flow generated by the guide vane collides with a large number of projections while traveling through the space between the cylindrical body and the hollow cylinder, and bubbles are generated. It is refined and this micronized bubble is uniformly mixed with the swirl upflow, so that a swirl upflow with high efficiency and high oxygen solubility can be generated, and the living environment of microorganisms can be improved under suitable conditions. There is an extremely remarkable effect.
[Brief description of the drawings]
FIG. 1 is an overall schematic configuration diagram of a bubbly water generator according to an embodiment. FIG. 2 is a main longitudinal sectional view of the main part of the same. FIG. 3 is a sectional view as seen from arrows IIIa-IIIa and IIIb-IIIb in FIG. FIG. 4 is an exploded perspective view of a cylindrical body portion and a guide vane. FIG. 5 is an explanatory view of an assembly modification of a projection of the cylindrical body portion. FIG. 6A is a main longitudinal sectional view of a conventional aerator, and FIG. ) (A) Cross-sectional view taken along line BB in the figure [Fig. 7] External perspective view of the pipe portion of the conventional aerator [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Bubble water production | generation apparatus 11 Hollow cylinder 12 Lower end 13 Outlet pipe 14 Guide vane 15 Protrusion 16 Bubble refinement means 16 'Cylindrical body 17 Screw rod

Claims (5)

A hollow cylinder of a predetermined diameter and length is erected, an air blowing pipe is inserted at the lower end inlet, a guide vane that guides the water flow in a spiral shape, and a swirl formed by this guide vane A bubble refining means that acts on the upward flow to refine the bubbles contained in the flow is provided in this order, and the bubble refining means is provided between the hollow cylinder and the cylindrical body. And a plurality of protrusions, and a bubble water generation device that makes bubbles finer by colliding a swirling upward flow caused by air from an outlet pipe with the protrusions. The plurality of protrusions are disposed at a predetermined angle on a plurality of circumferences spaced at predetermined intervals in the axial direction of the cylindrical body, and the plurality of protrusions viewed in the axial direction are arranged so as not to overlap each other. The refined bubble water generator according to claim 1. The plurality of protrusions are disposed at different positions by a predetermined angle in the direction in which the right screw or the left screw advances between adjacent protrusions on the circumference adjacent to each other when viewed in the axial direction from the bottom to the top of the cylindrical body. The refined bubble water generator according to claim 1 or 2, characterized in that 4. The refined bubble water generating apparatus according to claim 1, wherein the plurality of protrusions are provided in a space between the hollow cylinder and the columnar body in a radial direction of the columnar body and on the columnar body. 5. The microbubble water generation apparatus according to claim 1, wherein the guide vane includes a plurality of vertical guide plates and a plurality of curved guide plates connected thereto.

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