JP2007237155A - Microbubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbubble generator without being affected by fluid motion other than molecular motion such as Brownian motion, a change in temperature and a change in pressure of fluid, capable of efficiently generating a gas-liquid mixture liquid including a microbubble having a size of low Reynolds number in a simple structure hardly causing an obstacle and efficiently, and easily usable anywhere. <P>SOLUTION: The generator comprises using the principle of a free vortex, accelerating the flow velocity of a liquid or pressurizing the liquid, ejecting umbrella-like swiveling jet flow outside equipment, inserting several thin pipes into the swiveling jet flow at a suitable angle, specifying a peel point, efficiently causing atomizing action, obtaining a large number of air bubbles, dividing to crush the air bubble with a character as free shear flow possessed by the swiveling jet flow and a character as a forcible vortex generated inside the swiveling jet flow to make the microbubble, and making the gas-liquid mixture liquid containing a large amount of microbubbles into the swiveling jet flow to allow ejection in a liquid of the outside even if a pump having an output on the order of a head of water of 1 m and the amount of discharge water of 20 l/min. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fine bubble generator that dissolves a gas in a liquid, efficiently generates fine bubbles in the liquid, has a simple apparatus set, and can be used easily.

  A conventional method for generating fine bubbles in a liquid is a device for generating fine bubbles by gas fragmentation by a rotating blade mixing method, a jet jet mixing method, a bubble shearing method, a swirl flow boundary shearing method, or the like.

Conventionally, there has been provided a device for generating fine bubbles in a liquid by such a method, but each device has a problem of how to make the gas into fine bubbles.
In the mixing method in which a gas is pressurized and the blow-off diffusing method, a bubble in a pressurized state is generated, the generated bubble expands, and it is difficult to generate a bubble that contracts and collapses in the liquid.
In addition, in the method of subdividing the mixture of bubbles, bubbles, and gas in the air column state into a flow that forms a field where shear force is applied by rotating blades or jets, etc., the blade corrosion due to peeling action In addition, there is a problem of rotational vibration of the blades and vibration due to the jet flow, and the generation of fine bubbles in the separation is not efficient in generating bubbles although high output power is required.
As mentioned above, there is a problem with the generation of bubbles, the structure of the device is complicated and clogged with dust and deposits, high output power is required, and there is an accompanying water tank, etc. The set must be simplified so that it can be used conveniently.

The present invention has been devised in view of the above problems.
Its purpose is to prevent gas-liquid mixtures containing microbubbles of low Reynolds number that are not affected by fluid motion other than molecular motion such as Brownian motion, temperature change, and fluid pressure change. It is an object of the present invention to provide a fine bubble generating device that can be efficiently generated with a simple structure that is less likely to generate and can be used easily anywhere.

In order to achieve the above object, the present invention according to claim 1, claim 2, claim 3, and claim 4 shows that even if a pump with an output of a head 1 m discharge rate of 20 l / min is used, fine bubbles are generated. Is a device that can generate a gas-liquid mixture containing
Any one of claims 1, 2, 3, and 4 uses the principle of free vortex, accelerates the flow velocity, and has a jet flow velocity that matches the purpose of use of the device, and forms a shade in the outside. It is the apparatus comprised with the main body of the cylindrical part and several thin tubes for gas introduction which form the swirling jet flow of this.
A device for stable and efficient generation of fine bubbles will be described.
The idea was inspired by the characteristics of the free-flowing shear flow of the shade-shaped swirling flow formed outside and the characteristics of the forced vortex generated inside the shade-shaped swirling flow of the shade-shaped swirling flow.
When a thin tube for gas introduction is inserted into the free shear flow-shaped swirling jet flow from the outer or inner side of the cap-shaped swirling flow, the spraying action is caused by the separation point formed at the tube tip of the thin tube. A large pressure gradient is created at the peeling point, which determines the position, and the gas can be stably pulled out from the tube tip of the gas introduction capillary tube by the peeling action, and the bubbles drawn out from the gas introduction capillary tube The disruption of the free shear flow pulverizes to form fine bubbles, and the fine bubbles are blown away by the squirrel-shaped swirling jet flow, which prevents the fine bubbles from gathering into large bubbles.
By inserting the tube tip of the narrow tube for gas introduction into the cap-shaped swirling jet flow, the cap-shaped swirling jet flow becomes turbulent and the jetting force is weakened, but the strength of the jet flow required for the device is maintained. If possible, the number of capillaries can be increased to the limit, and as many microbubbles can be generated as the number of capillaries increases.
When a narrow tube for gas introduction is inserted into the squirrel swirl jet flow from the inside of the stagnation swirl jet flow, a pressure gradient occurs in the center due to the action of the forced vortex generated inside the stagnation swirl flow. In addition, the force to pull out the gas from the tube tip of the gas introduction thin tube is strengthened, and the flow sucked from the outside to the center of the forced vortex is also generated, colliding with the inside of the shaded swirling jet flow and the shaded shape. It has a strong shearing force on the surface, and it breaks up and crushes bubbles to generate many fine bubbles.
As described above, it is possible to easily generate a gas-liquid mixture containing fine bubbles as a swirling jet flow in the liquid by utilizing the properties of the fluid that can be extracted by low output power or small potential energy. Produced the device.

The effect of the fine bubble generator according to the present invention described above is as follows.
(1) Microbubbles can be easily generated efficiently with a simple structure.
(2) By adjusting the diameter of the narrow tube and the pressure of the introduced gas, the size of the bubbles can be adjusted and stable generation can be achieved.
(3) Since the driving energy can be large or small to some extent, it can be used economically and easily.
(4) Since the structure of the device is simple, the operation is simple and there are few obstacles.
(5) Since both a large device and a small device can be manufactured, it can be used in many usage ranges.
(6) Since the types of liquids and gases to be used can be used for various objects, they can be used in various fields. However, if it is toxic, it is necessary to prepare an appropriate environment.
(7) In addition to use in the relationship between liquid and gas, different types of liquids and liquids can also be used. They can be easily diffused, mixed, fused, or diffused in colloidal form due to the compatibility of liquids. be able to. However, it is necessary to prepare an appropriate environment for use.
It can be shown in the above seven items.

The best mode for carrying out the present invention will be specifically described below.
The range to which the apparatus of the present invention can be applied is that the viscosity of the liquid is less than the viscosity of water and the pressure of the external liquid ejected by the apparatus is a water level of 2 m or less when water is targeted. Invented as a device that operates at a water pressure of.

In the following, with reference to the drawings, FIG. 1 is an explanatory view of the longitudinal section and configuration of the instrument of the present invention. From the liquid inlet (2), the head is 1 m · 20 l / min. With the same level of pump, the liquid is pressed in, and a circular concave lens-like inner chamber (B) forms a swirling flow along the inner wall circumference without disturbance by the rectifying reed valve (4), thereby accelerating the flow velocity. Then, a cap-shaped swirling jet flow (C) is formed outside from the liquid jet hole (3), the gas is taken in from the gas introduction pipe (5), and the air pressure is adjusted by the gas flow control valve (6). Adjust the diameter of the fine bubbles that change due to external factors such as water pressure, guide the gas to the ejection hole (3) with the bundle of thin tubes for gas introduction (7b), and place the tube tip (8b) of the narrow tube at an appropriate angle. At this position, it is inserted into a whirling swirl jet flow to obtain a large pressure gradient due to separation, and the gas is smoothly drawn out from the end of the tube of the narrow tube to cause a spraying action. In order to efficiently cause the spraying action, it is necessary to specify the peeling point.
The gas withdrawn from the tube tip of the narrow tube becomes bubbles and is mixed with the free flowing shear-shaped swirling jet flow, divided and pulverized into fine bubbles. It becomes a jet flow of gas-liquid mixture containing bubbles and jets to the outside.

  FIG. 2 is a cross-sectional view of the instrument, and the flow of liquid (D) is indicated by an arrow. The liquid is taken in from the liquid inlet (2), and the rectifying reed valve (4) forms a swirl flow as a free vortex in the inner chamber (B) of the circular concave lens along the inner wall circumferential portion without being disturbed. The liquid is pressurized at the center of the inner chamber, the flow velocity is accelerated, and the mixture is ejected from the ejection hole (3) as a whirling swirl jet flow. Further, the bundle of thin tubes for introducing gas (7b) is formed by centripetal force, and further hinders the generation of air columns that tend to be large bubbles.

を持ち、気泡を分断、粉砕し、霧吹き作用と伴に多くの微細気泡を含む気液混合液を液体中に噴出させる。FIG. 3 is a partial cross section near the ejection hole (3) in the center of the instrument. The liquid pressurized and accelerated in the inner chamber (B) like a circular concave lens is transferred from the ejection hole (3) to the outside of the apparatus. A gas-like swirling jet (C) is ejected into the liquid (E), and the gas is guided to the ejection hole (3) by a gas introduction narrow tube (7a) and a bundle of thin tubes (7b). (8a) is inserted from the shaded outer side of the shaded swirling jet flow to cause a spraying action. Further, when the tube tip (8b) of the bundle of narrow tubes is inserted from the inside of the shade-shaped swirling jet flow, a pressure gradient is generated at the center due to the action of the forced vortex (G) generated inside the shade-shaped inside. Occurred, the force to pull out the gas from the tube tip (8b) of the thin tube for gas introduction, and was sucked from the outside to the center of the forced vortex,

The gas-liquid mixed solution containing many fine bubbles is sprayed into the liquid with the spraying action.

  FIG. 4 is a view of the vicinity of the ejection hole (3) in the center of the instrument as viewed from the outside, and is inserted from the outside and inside at an appropriate angle and position into the ejection hole (3) and the cap-shaped swirling ejection flow. The tube tips (8a) and (8b) of the thin tube for introducing gas were shown.

Explanatory drawing of the longitudinal section and composition of the instrument of the present invention Cross-sectional view of the instrument of the present invention Detailed cross-sectional view around the ejection hole of the instrument of the present invention Elevation detail view around the jet hole of the instrument of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body of cylindrical body 2 Liquid introduction port 3 Ejection hole 4 Rectification reed valve 5 Gas introduction pipe 6 Gas flow control valve 7a Gas introduction thin tube 7b inserted from the outside of the cap-shaped swirling jet flow Cap-shaped swirling jet A bundle of thin tubes for introducing gas 8a inserted from the inside of the flow A tube tip of a thin tube for introducing gas 8b inserted from the outside of the cap-shaped swirling jet flow A tube tip of a bundle of thin tubes for introducing gas inserted from the inside of the cap-shaped swirling jet flow A Lifting height 1 m · 20 l / min. Or a pump with the same level of pressure, B, a circular concave lens-like inner chamber C, a cap-shaped swirling jet D, a liquid flow in a circular concave lens-like inner chamber, E, a liquid outside the device Flow G drawn from the outside to the center of the forced vortex G Forced vortex generated inside the shade

Claims (7)

  The cylindrical barrel has a circular concave lens-like inner chamber, and a slit is opened in the inner chamber circumference so that a swirling flow is formed along the tangential direction of the inner wall circumference. Suitable for the flow velocity of the jet flow, which forms a cap-shaped swirling jet flow outside the injection hole of the diameter that meets the flow velocity of the jet flow required as a device at the center of the cylinder as a pressurized liquid inlet Fine bubbles are mixed into the liquid by inserting the number of thin tubes for gas introduction into the liquid at the appropriate angle and position and inserting the tip of the tube into the glass-shaped swirling jet from outside the cap-shaped swirling jet. A fine bubble generating device characterized by generating.   An inner wall circle that has a circular concave lens-like inner chamber in a cylindrical body, and is provided in an optimal positional relationship with the inlet of the pressurized liquid that opens to the circumference of the inner chamber and the mounting angle of the inlet A rectifying reed valve that creates a swirl flow along the circumference is installed, and a cap-shaped swirl jet flow is formed externally from a jet hole with a diameter that matches the flow velocity of the jet flow required as a device at the center of the upper part of the cylinder. By inserting the number of thin gas introduction tubes that match the flow velocity of the jet flow into the cap-shaped swirling jet flow from the outside of the cap-shaped swirling jet flow at an appropriate angle and position, a fine spray can be generated. A fine bubble generator characterized by mixing and generating bubbles in a liquid.   The cylindrical barrel has a circular concave lens-like inner chamber, and a slit is opened in the inner chamber circumference so that a swirling flow is formed along the tangential direction of the inner wall circumference. Suitable for the flow velocity of the jet flow, which forms a cap-shaped swirling jet flow outside the injection hole of the diameter that meets the flow velocity of the jet flow required as a device at the center of the cylinder as a pressurized liquid inlet A bundle of thin tubes for introducing a number of gases is passed through the center of the cylinder so as to prevent the generation of air columns that tend to be large bubbles, and the tube tip is stopped at the position where it is peeked out from the ejection hole, Fine bubbles are mixed and generated in the liquid by inserting each tube into the cap-shaped swirling jet flow from the inside of the cap-shaped swirling jet flow at an appropriate angle and position to cause a spraying action. At the same time, the central part of the swirling jet flows into the negative pressure area unique to the vortex. The force to pull out the gas from the bundle of thin tubes installed in the tube works strongly, and also the flow from the outside sucked in the negative pressure region, and the large shearing force works to generate and mix fine bubbles in the liquid more efficiently. A fine bubble generator characterized by the above.   An inner wall circle that has a circular concave lens-like inner chamber in a cylindrical body, and is provided in an optimal positional relationship with the inlet of the pressurized liquid that opens to the circumference of the inner chamber and the mounting angle of the inlet A rectifying reed valve that creates a swirl flow along the circumference is installed, and a cap-shaped swirl jet flow is formed externally from a jet hole with a diameter that matches the flow velocity of the jet flow required as a device at the center of the upper part of the cylinder. A bundle of thin tubes for introducing a number of gases that match the flow velocity of the jet flow is passed through the center of the cylinder to prevent the generation of air columns that tend to become large bubbles, and the tip of the tube is externally connected from the jet hole. By stopping at the position where it has been peeked out, and inserting the tube tip into the cap-shaped swirling jet flow at the appropriate angle and position from the inside of the cap-shaped swirling jet flow, causing a spraying action, When fine bubbles are mixed and generated in the liquid, The area becomes the area of negative pressure peculiar to the vortex, and the force to pull out the gas from the bundle of thin tubes provided in the center works strongly. In addition, the flow from the outside is also generated in the negative pressure area, and the large shearing force works. A fine bubble generating apparatus characterized in that fine bubbles are mixed and generated in a liquid more efficiently.   The microbubble generator according to claim 3 or 4, wherein the surface having the cylindrical ejection holes is a concave surface for adsorption.   A fine bubble generator having the structure described in claim 1 and claim 2 in terms of the number, position, etc. of the gas introduction tubules.   A fine bubble generating apparatus having the structure described in claim 3 and claim 4 in terms of the number, position, etc. of the gas introduction tubules.

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