JP2012120997A - Method for producing microbubble and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means which can be easily installed not only in a production plant but also in an ordinary home, whose use is simple, and which can efficiently obtain water containing microbubbles.SOLUTION: The microbubble generation device is constituted of: a fluid feeding pipe 1 for feeding-in a fluid, provided with an energizing means in which a spiral groove 11 is provided at the inner face of the inlet part of a pipe and a flow passage turned to the downstream side is made narrow; a porous pipe 2 made of the sintered compact of a shirasu balloon or the like and arranged in order on the downstream side of the feeding pipe; and a fluid discharging pipe 3.

Description

  The present invention relates to a method and an apparatus for easily producing water containing microbubbles.

Since water is a valuable resource obtained from nature that is widely used as water for daily life, industrial water, agricultural water, and aquaculture, its effective use has been emphasized in recent years. In order to purify and regenerate contaminated water and supply oxygen to aquatic organisms, air is sent into the water.
In order to supply dissolved oxygen to water, since it is effective to send air as microbubbles, various methods for generating microbubbles have been proposed.
As a simple method, there is a method of releasing air from a porous container such as a SPG (shirasu, porous, glass) container through the vessel wall into the water tank, but water containing fine bubbles is used as washing water, etc. In order to do this, it was necessary to prepare a means for pumping out of the water tank, and there was a problem that the bubbles disappeared before being taken out.

Aside from the above, as a method of obtaining water (bubble water) that is connected to a faucet of tap water, for example, using the structure of an aspirator, air that sucks air into the flow path through which tap water flows An introduction path is provided, air is drawn into the water stream with a negative pressure (decompression) generated by the water flow, and a device (Patent Document 1) for generating microbubbles with a large number of rotating blades provided downstream of the water flow path or hot water in the bathtub In some cases, an aspirator pipe having a pipe diameter reduced in the direction of water flow and a spiral inner surface is provided in the circulation path to be circulated, and a ball valve for supplying air to the aspirator pipe is provided (Patent Literature). 2).
In any of these methods, an air introduction hole is provided in the side surface of the water flow path of the aspirator, and air is sucked into the flow path from the air introduction hole to form fine bubbles.

JP-A-2005-305219 JP-A-6-319774

  A conventional microbubble generator is a method in which an air introduction hole is provided on the side surface of a water flow path of an aspirator, and air is drawn into the flow path from the air introduction hole to create fine bubbles. There were problems such as difficulty in obtaining the desired fine bubbles to adjust the fineness of the bubbles.

The present invention provides a means that is simple in structure and can easily produce and supply flowing water containing desired fine bubbles.
The fine bubble generating apparatus of the present invention has a porous tube made of SPG or the like disposed between water flow paths (flow water pipes), and air is sucked or pressed into the water flow path from the porous pipes. It consists of the method of obtaining the water stream containing.
An apparatus based on a method for sucking air from a porous tube uses the principle of an aspirator, and is provided with a running water feeding tube for feeding running water having a biasing means in the pipe, and a downstream side of the feeding tube. Are composed of a porous tube and a fluid discharge tube arranged in sequence. In the present invention according to this method, air is taken as fine bubbles from the porous tube into the flowing water passing through the bubble generating device by the negative pressure in the flow path generated by the water flow from the flowing water inlet tube.
Another aspect of the present invention is a method for obtaining a water flow containing fine air by press-fitting air into a water flow in a bubble generating device through a porous tube, and a flowing water supply tube and a downstream side of the supply tube. In addition to the porous tube and the fluid discharge tube that are sequentially arranged, the air supply device is configured to supply pressurized air to the porous tube.

In the fine bubble generating device of the present invention, air is taken into the water as fine bubbles from the porous tube, so that a water flow containing bubbles of the desired fineness can be easily obtained.
Since the first apparatus of the present invention only needs to include a fluid inlet pipe and a porous pipe provided with an urging means, it can be easily used in general households in addition to production facilities such as factories.
In addition, the second device of the present invention only needs to be provided with a pressurizing means for injecting air into the flow path through the porous tube, and it is not necessary to accelerate the water flowing through the device. There is an advantage that required fine air can be included in the flowing water.
In this specification, water and air are described. However, other liquids may be used instead of water, and other gases such as oxygen may be used instead of air.

Sectional drawing which shows the basic composition of this invention apparatus. Sectional drawing which shows the other example of this invention apparatus. Sectional drawing which shows another example of this invention apparatus. The perspective view which shows an example of use of this invention apparatus. The disassembled perspective view which shows an example of use of this invention apparatus. The schematic diagram which shows another apparatus of this invention.

The flowing water inlet pipe used in the first aspect of the present invention may be of any shape that allows the water stream to flow into the porous pipe vigorously. As the fluid urging means provided in the flowing water inlet pipe, the flow path of the flowing water inlet pipe is simply made narrower toward the downstream side, that is, a conical shape whose tip is gradually reduced in inner diameter (hereinafter simply referred to as a cone). In addition, a spiral groove (spiral strip) or the like for imparting a turning property (swivel force) to the water flow may be provided in the inlet portion of the flow path. Moreover, you may provide a screw etc. instead of a spiral strip.
The flowing water inlet pipe is usually preferably made of metal, but may be made of plastic, glass or the like.

The porous tube is not particularly limited, and a tube having many appropriate fine holes is used. For example, a tube such as a sintered body or a molded body made of particles having an appropriate particle diameter can be used. Examples of the material include glass, ceramic, metal, and the like, and there are sintered bodies such as shirasu balloons and stainless particles. In addition, carbon pipes, carbon fiber pipes, and the like can also be used. A porous tube (SPG) using a shirasu balloon is preferable in that it is inexpensive, does not rust, and has no components to elute.
The degree of porosity of the porous tube may be selected depending on the material, and may be adjusted depending on the length of the porous tube. In the case of a carbon fiber tube, it is adjusted by the thickness of the carbon fiber and how it is wound.
The liquid discharge tube connected to the porous tube is not particularly limited, but a rubber tube, a plastic tube, or the like is preferable.

Several examples of the present invention are shown below with reference to the drawings, but the present invention is not limited to these examples. In the following description, the liquid is water and the gas is air.
FIG. 1 is a cross-sectional view showing the basic structure of the present invention, wherein 1 is a water inlet pipe, 2 is a porous pipe, 3 is a water discharge pipe, and 4 is a connection rubber pipe. When tap water is fed into the water feed pipe 1, a turning force is given by the screw portion 11 in the feed pipe 1, and this water further passes through the inside of the pipe 1 of the conical pipe line 12. The rotational property is enhanced and the gas is discharged into the porous tube 2. When water is discharged into the large-diameter porous tube 2 from the narrow-diameter outlet 13 at the tip of the conical pipe 12 of the inlet tube 1, the pressure in the porous tube 2 decreases due to the venturi effect or the like. Due to the pressure drop in the porous tube 2, air is drawn into the tube 2 from a large number of holes on the side wall of the porous tube 2 and taken into the water flowing in the tube 2, and bubble water From the water discharge pipe 3.
Since the water flowing in the porous tube 2 is water that flows rapidly while rotating, bubbles that have passed through the wall of the tube 2 do not grow into microbubbles and are contained in the water flow.

FIG. 2 is a view showing another embodiment of the present invention, and the outlet 13 at the tip of the conical pipe 12 of the water inlet pipe 1 is porous so that the pressure reducing effect in the porous pipe 2 can be obtained more reliably. This is an example of being in the tube 2.
Since the present invention itself is a phenomenon occurring inside the aspirator, the presence of the outlet 13 at the tip of the water inlet pipe 1 inside the porous pipe 2 provides a stronger air bubble suction effect, and a large amount of homogeneous air bubbles are produced. Good bubble water is obtained.
Since the pressure reduction effect of the aspirator seems to be caused by the pressure drop generated in the center of the water flow due to the centrifugal force of the water flowing as a rotating flow, a larger amount of bubbles can be included by configuring as in this example. .

FIG. 3 shows an example in which a suitable cover (compartment member) 5 is attached to the outer surface of the part including the porous tube 2 of the apparatus of the present invention. By supplying a gas other than air, for example, oxygen, nitrogen, carbon dioxide gas, or the like into the cover 5, bubble water containing these gases can be obtained.
The amount of bubbles to be included in the water can be changed by changing the type of the porous tube. However, as shown in the figure, the mounting position of the water discharge tube 3 is changed to change the exposed length of the porous tube 2. May be performed. 3 'shows the moved porous tube.
The present embodiment shows an example in which the outer shape of the tip of the water inlet tube 1 is conical and there is a gap between the inner surface of the porous tube 2. The amount and size of the bubbles can be adjusted by adjusting the width (thickness) and length of the gap.

FIG. 4 is a diagram showing an example of a state in which the device of the present invention is used.
It is an example attached to a faucet of a household water supply, and comprises a faucet 6 through a connecting pipe 8 and joining members 7, 9, a water inlet pipe 1, a porous pipe 2, a water discharge pipe 3 and a connecting rubber pipe 4 The apparatus A of the present invention is installed. FIG. 5 is an exploded perspective view showing a mounted state.

FIG. 6 shows an embodiment of the second apparatus of the present invention. As shown in the figure, a box 51 surrounding the outer periphery of the porous pipe 2 is provided, and pressurized air is fed into the box 51 through a pipe 52 by a pressurizing pump 53. In the figure, 54 is a valve for adjusting the pressurized air to be fed, and 55 is a pressure gauge. In the case of the present embodiment, since it is not necessary to accelerate the water flow, the pipe 12 of the water inlet pipe 1 may or may not be conical.
In the case of this apparatus, the speed of the water flow can be adjusted by the air injected from the porous tube 2. Instead of air, other gases such as oxygen may be used.
By adjusting the pressure, amount and the like of the air sent to the porous tube 2, the size and amount of bubbles contained in the water stream can be arbitrarily adjusted.

1 .... Water inlet pipe 2 .... Porous pipe 3 .... Water discharge pipe 4 .... Rubber pipe for connection

Claims (5)

  A flowing water inlet pipe, a porous pipe arranged in order on the downstream side of the inlet pipe, and a fluid discharge pipe, for obtaining a water flow containing fine bubbles by sucking or injecting gas from the porous pipe Fine bubble generator.   A fine bubble generator comprising: a fluid inlet tube for feeding a fluid having an urging means in the tube; a porous tube arranged in order on the downstream side of the inlet tube; and a fluid discharge tube.   It consists of a flowing water inlet pipe, a porous pipe and a fluid discharge pipe arranged in order on the downstream side of the inlet pipe. A box surrounding the outer periphery of the porous pipe is provided, and pressurized gas is supplied to the box. A fine bubble generating device that feeds and inserts fine bubbles into running water through a porous tube.   The fine bubble generating device according to any one of claims 1 to 3, wherein the gas is oxygen, nitrogen, or carbon dioxide gas in addition to air.   The microbubble generator according to any one of claims 1 to 3, wherein the porous tube is an SPG (Shirasu-Porous Glass) tube.

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