JP3141846U - Microbubble generator - Google Patents

Abstract

Disclosed is a spray device for a liquid containing a minute gas, which can be simplified and can be miniaturized.
A main body portion 2 having a gas-liquid mixing space 2A, a liquid introduction portion 3 for generating a swirling flow in the liquid introduced into the gas-liquid mixing space 2A, and the swirling flow center position in the gas-liquid mixing space. A liquid flow restricting portion 2B formed of a convex portion projecting into the space, and a maximum converging portion at the end in the penetrating direction through the liquid flow restricting portion 2B and communicating with the gas-liquid mixing space and the outside. A microbubble-containing liquid comprising: a converging section 2C provided; and a diffusion part 2E continuous to the maximum converging part, wherein an opening of a gas introducing part 4 capable of introducing gas is positioned in the vicinity of the maximum converging part Spraying equipment.
[Selection] Figure 2

Description

  The present invention relates to a microbubble generator, and more particularly to a mechanism for incorporating nanobubbles in a liquid.

  Microbubbles, which are one of the microbubbles, are produced by creating a bubble by evaporating due to a change in pressure when a liquid flowing at high pressure is discharged to the low pressure part. It is known that it can be obtained by crushing and making it finer by placing it below (for example, Non-Patent Document 1).

  A configuration for generating microbubbles is a configuration in which gas is discharged into a liquid, and the generated gas-liquid mixture is given a motion such as a jet or swirl to crush and refine bubbles by a shear force between the liquid and liquid (for example, , Patent Document 1), a configuration in which a rotating cylinder is provided in a fixed cylinder, and a gas-liquid mixture is introduced into a cylindrical wall-like slit between the cylinders to refine bubbles (for example, Patent Document 2), in contact with a solid In such a configuration, the liquid is held and the bubbles are made fine by applying a blow that does not destroy the solid in the state where the bubbles are present in the liquid (for example, Patent Document 3), or ultrasonic vibration is applied to the microbubbles. There is a configuration in which the bubbles are rapidly reduced in diameter by applying a physical stimulus of the above to produce nanobubbles finer than microbubbles (for example, Patent Document 4).

JP 2006-198597 A JP 2002-346578 A Japanese Patent Laid-Open No. 2005-138022 JP 2006-87984 A Issued on February 10, 2006 Industrial Research Edition “World of Micro Bubbles”, pages 72-74

  However, in the configuration for incorporating nanobubbles in the liquid as disclosed in each of the above patent documents, high-pressure swirling of the aqueous solution and high compression of the gas are required, so that the equipment used is relatively large. There is a problem that it is difficult to apply to a humidifier or a mist generating device that diffuses a liquid containing nanobubbles.

  Microbubbles are not only contained in liquid and used in the form of so-called vapor, but also, for example, diffused into water such as seawater to increase the oxygen concentration in water or to collect and collect suspended dust in water. Sometimes used to do.

  In this case, the structural component immersed in water is often formed of a water-resistant material such as stainless steel. However, erosion (erosion, erosion) may occur in the structural components of the microbubble generator due to cavitation during the microbubble generation process, and the structural components may become unusable.

  An object of the present invention is to provide a structure capable of simplifying the apparatus and miniaturizing in view of the problems in the conventional microbubble generator described above, and further ensuring the durability of the structural components used. It is providing the microbubble generator provided with the structure.

In order to achieve this object, the present invention has the following configuration.
(1) a main body having a gas-liquid mixing space;
A liquid introduction section for causing a swirl flow in the liquid introduced into the gas-liquid mixing space;
A liquid flow restricting portion comprising a convex portion projecting toward the swirl flow center position in the gas-liquid mixing space;
A liquid flow discharge portion that penetrates the liquid flow restricting portion and communicates the gas-liquid mixing space and the outside, and a gas introduction portion that introduces gas into the liquid flow discharge portion,
The liquid flow restricting portion is a convergent cross-sectional portion formed by converging sequentially from the gas-liquid mixing space side along the penetrating direction of the liquid flow discharge portion to form a minimum inner diameter portion and a large diameter portion continuous to the minimum inner diameter portion. Have
A microbubble generator characterized in that the tip opening of the gas introduction part is positioned and provided at a maximum flow velocity generation part that is generated by narrowing the liquid flow at the maximum convergence part in the convergence cross section. .
(2) The front end opening of the gas introduction part is positioned in the vicinity of a converging cross-sectional part having a minimum inner diameter in the liquid flow constriction part or at a position not exceeding the minimum inner diameter part in the penetration direction. The microbubble generator described in (1).
(3) Vibrating means for causing high-frequency vibration by causing a liquid containing a gas refined in the gas introducing portion to collide is disposed in the vicinity of the front end opening of the gas introducing portion (1). ) Or the microbubble generator according to (2).
(4) The microbubble generator according to any one of (1) to (3), wherein oxygen or ozone gas is introduced from a gas introduction part.
(5) The microbubble generator according to any one of (1) to (3), wherein the gas introduction part is constituted by a corrosion-resistant part.
(6) The microbubbles according to (5), wherein the corrosion-resistant portion is subjected to a corrosion-resistant treatment using a corrosion-resistant material such as a titanium alloy or glass or a tetrafluoroethylene resin. Generator.
(7) The microbubble generator according to (1), wherein a liquid corresponding to a use is selected and introduced into the liquid introduction unit.
(8) The microbubble generator according to (6), wherein warm water is used as the liquid introduced into the liquid introduction part.
(9) The microbubble generator according to (6), wherein ozone water is used as the liquid introduced into the liquid introduction part.

  In the present invention, since the liquid that is swirled and introduced into the gas-liquid mixing space can increase the flow velocity in the liquid flow constriction section, for example, even when the swirl flow is introduced at a low pressure such as tap water. By increasing the flow velocity at the center position, the pressure drop in the vicinity of the converging cross section becomes significant, and the liquid is self-primed in a high-speed flow state in the converging cross section.

  As a result, the liquid introduced into the converging cross section becomes a high-speed flow as it reaches the maximum converging part due to the cross-sectional shape in the converging cross sectional part, and when passing through the maximum converging part, the pressure drop in that part Becomes more prominent than immediately before passing through the maximum convergence portion.

  For this reason, the gas introduced from the opening of the gas introduction part arranged in the vicinity of the maximum converging part is a reverse flow or diffusion part caused by a pressure drop at the center of the swirl flow generated in the liquid flow and a negative pressure due to this pressure drop. It is pulled out by the negative pressure tendency due to the separation of the liquid flow generated at the boundary portion.

  Furthermore, the gas extracted due to the negative pressure tendency due to the separation of the liquid flow moves without expanding by receiving the pressure of the liquid flow immediately before passing through the maximum convergence portion, and immediately after passing through the maximum convergence portion In addition to being crushed by an increase in pressure, the opportunity for contact between the bubbles is reduced and the coalescence is prevented while being united, and further miniaturization is promoted.

  As a result, bubbles can be drawn out and refined by changing the flow velocity of the swirling flow without using a large facility such as a special high-pressure swirling flow generating means, so the gas to be introduced into the gas introduction section is selected. Thus, it is possible to obtain a humidifier or a mist generating device that is desired to have a humidifying action having a disinfecting and sterilizing action in a miniaturized state.

  Moreover, by applying a corrosion treatment with a material such as titanium alloy or glass or tetrafluoroethylene to the gas introducing member located in the vicinity of the maximum converging portion, which is one of the places where bubbles are crushed, It can be made less susceptible to erosion due to cavitation. Thereby, since durability of a gas introduction part and this peripheral part can be improved, recovery of oxygen concentration in water and adhesion collection of algae, plankton, floating dust, etc. can be continued for a long period of time.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the illustrated embodiments.

FIG. 1 is an external view showing a spray portion of a humidifier as an example of a spray device for a micro gas-containing liquid according to an embodiment of the present invention.
In the figure, the spray unit 1 includes a main body 2 having a space for gas-liquid mixing therein, a liquid introduction unit 3 connected to a position where a swirling flow can be generated with respect to the space of the main body 2, and a later-described The gas introduction part 4 which can supply gas toward the convergence cross-section part to perform is provided as a main part.

  The main body 2 has extracted only the gas-liquid mixing space 2A shown in FIGS. 2 and 2 which is a cross-sectional view in the direction indicated by reference numeral (2) in FIG. 1 and the liquid flow introduction part 3 communicating therewith. As shown in FIG. 3 which is a sectional view in the direction indicated by the reference numeral (3) in FIG. 3 which is a sectional view in a plan view state, a gas-liquid mixing space having an internal shape like an impeller chamber in a pump 2A is provided, and a liquid introducing portion 3 communicating in the tangential direction is connected to a part of the outer peripheral portion of the gas-liquid mixing space 2A. In FIG. 3, reference numeral 3 </ b> A denotes a gas rectifying member introduced into the gas-liquid mixing space 2 </ b> A.

  At the center of the swirl flow in the gas-liquid mixing space 2A, there is provided a liquid flow restricting portion 2B configured by a convex portion having an inclined surface protruding inward of the space 2A.

  The liquid flow restricting part 2B is a part that speeds up the flow velocity in the central part of the swirling flow by restricting the swirling liquid flow introduced into the gas-liquid mixing space 2A, and causes a pressure drop in the central part of the swirling flow. Thus, the swirl flow can be sucked toward the center of the swirl flow.

  A converging cross-sectional portion 2C that penetrates the liquid flow constricting portion 2B is provided at the center of the liquid constricting portion 2B, and the converging cross-sectional portion 2C has one end in the penetrating direction opened on the liquid constricting portion 2B side, The diameter is reduced from the opening to the other end in the penetrating direction, and a diffusing portion 5 having a diameter larger than the inner diameter is connected to a maximum converging portion that is an opening having a minimum inner diameter.

  The converging section 2C has an inner diameter that decreases toward the diffusion part 5 along the penetrating direction, so that the flow velocity of the liquid flow passing through the maximum converging part is increased and the pressure immediately before the pressure passes through the maximum converging part. It has a lower function.

  The pressure drop when passing through the maximum converging part is greater than the pressure drop at the center of the swirling flow, and this provides a moving direction in which the liquid flow at the center of the swirling flow is sucked toward the converging section 2C. It is supposed to be. The above-described pressure drop relationship can be obtained by appropriately setting the size of the reduced diameter at the converging cross section 2C, in other words, the amount of internal gradient of the converging cross section 2C.

  Needle-like gas introduction using a titanium alloy, which is one of the corrosion-resistant materials, is provided with a shut-off valve 4A capable of adjusting the flow rate in the minimum inner diameter portion of the convergence cross section 2C, that is, in the vicinity of the maximum convergence portion. The tip of part 4 is arranged. In addition, since the gas introduction part 4 is comprised as a corrosion-resistant part using a corrosion-resistant material as mentioned above, not only titanium alloy but also glass is used as a corrosion-resistant material, or the target administration of the material is used. In addition, the target section can be formed by a corrosion-resistant treatment coated with a tetrafluoroethylene resin.

  Since the gas introduction part 4 arranged in the vicinity of the maximum converging part where bubbles are crushed is made of a corrosion-resistant material such as a titanium alloy, it can be made less susceptible to the effects of cavitation erosion that occurs during the crushing. . In this way, recovery of oxygen concentration in water and adhesion and recovery of suspended dust can be continued for a long period of time without deteriorating the durability at the location where a liquid flow containing extremely fine bubbles is generated. Can do.

  The tip opening of the gas introduction part 4 is positioned at a position not exceeding the minimum inner diameter part so that it does not protrude from the maximum flow velocity generating part corresponding to the minimum inner diameter part in the penetration direction of the convergent cross section 2C to the diffusion part 5 side. Can be introduced.

  In this embodiment, as shown in FIG. 2 (B), the position of the opening is located on the front side of the boundary portion P with the concave portion 2E of the diffusing portion 5 described later, and between the boundary portion P and the opening. A slight gap is formed. This gap is an area in which the gas from the opening can be drawn out due to the negative pressure tendency when the liquid flow that has passed through the maximum converging portion peels at the boundary portion P.

  The opening diameter of the needle used as the gas introduction part 4 in this embodiment corresponds to the bubble size at the stage before the outer diameter of the microbubbles is obtained by crushing / shearing in the diffusion part 2E performed just before spraying. I'm allowed.

  The gas introduced into the gas introduction part in this embodiment is oxygen or ozone having a sterilization effect such as sterilization or sterilization when the use environment is a hospital or home, and the gas is introduced by the gas introduction part 4. It is introduced from a connected source (not shown).

  Moreover, as the liquid introduced from the liquid introduction part 3, warm water above normal temperature may be used, and when using such warm water, drying of plants such as tea leaves is targeted.

  In addition, the liquid introduced from the liquid introduction unit 3 is not limited to purified water or hot water, and ozone water can also be used. In this case, the ozone water is a microbubble generation structure in the liquid according to the present invention. This corresponds to ozone-containing water produced by containing ozone in a liquid or other known methods.

  When it is necessary to manage the concentration in the injection amount of the microbubble-containing liquid with respect to the supply amount of oxygen and ozone, the configuration shown in FIG. 4 is used.

  FIG. 4 is a block diagram when a humidifier is used as a target for explaining the gas introduction amount control mechanism. In FIG. 4, the liquid introduction is performed in the humidifier 100 including the spray unit 1 of the minute gas-containing liquid. It is possible to detect the gas concentration in the atmosphere of the place where the liquid pump P1 provided in the pipe line communicating with the unit 3 and the pump P2 provided in the pipe line communicating with the gas introducing unit 4 and the humidifier are used or used. A control unit 100 to which a gas concentration sensor 101 provided at a position is connected is provided.

  The control unit 100 sprays droplets containing microbubbles having an appropriate gas concentration by controlling the operation of the angular pumps P1 and P2 according to the concentration detection result from the gas concentration sensor 101. .

  The diffusing portion 5 having the other end in the penetrating direction of the converging cross-sectional portion 2C is open by using a recess 2E forming a diffuser portion formed on the liquid flow discharge side in the gas-liquid mixing space of the main body and the gas introducing portion 4. And a plate-like weir portion 5A that is supported.

  The diffusion part 5 is a part that receives a crushing / shearing action when the microbubbles ejected into the recess 2E forming the diffuser part are subjected to atmospheric pressure and are subjected to a crushing / shearing action. The dam portion 5A is used as a portion that collides and diffuses a liquid flow containing bubbles to be injected.

  In the case of the present embodiment, an ultrasonic vibration plate is used as the dam plate 5, and the bubbles are further refined by applying vibration to the liquid flow including the colliding bubbles.

  Instead of using the dam plate 5 as a vibration plate, inside the passage using an ultrasonic vibration plate in which the dam plate 5A is removed and the microbubble-containing liquid discharged from the diffusing portion 2E is disposed in the vicinity of the spraying device 1 ( (Not shown) may be allowed to pass through.

  Since the present embodiment is configured as described above, the liquid flow introduced from the liquid introduction unit 3 becomes a swirl flow inside the gas-liquid mixing space 2, and in the liquid flow constriction unit 2B located near the swirl center. When the flow velocity is increased, the pressure is reduced, and further, the pressure is reduced by the pressure in the convergent section 2C communicating with the gas-liquid mixing space 2 and is self-primed into the convergent section 2C.

  The liquid flow introduced into the converging cross section 2C has a flow velocity increased in accordance with the internal shape of the converging cross section 2C, and is caused by a pressure drop and a negative pressure due to this pressure drop when passing through the maximum converging part. Negative pressure tends to occur due to separation at the boundary between the backflow and the diffusion part.

  The gas introduced from the opening of the gas introducing portion 4 with respect to the vicinity of the maximum converging portion in the converging cross section 2C is drawn out from the opening due to the pressure drop generated in the maximum converging portion and the negative pressure tendency due to the separation phenomenon. .

  The gas drawn out from the opening of the gas introduction part 4 in response to the pressure of the liquid flow passing through the maximum converging part being lower than the pressure immediately before passing through the maximum converging part is drawn out in a state where it does not inadvertently expand. In this state, it passes through the maximum convergence part.

  The gas drawn out from the opening is forcibly drawn above its own introduction pressure due to separation on the liquid side, so that it is introduced in a large amount compared to the amount of fumarole due to its own introduction pressure. The amount of bubbles to be converted is increased.

  When the gas passing through the maximum converging part reaches the diffusion part 5 after the pressure drops together with bubbles evaporated from the liquid flow when passing through the maximum converging part, the gas is crushed by receiving an atmospheric pressure higher than the reduced pressure. Will be refined.

  When only the liquid flow passes through the maximum converging part, it is a normal phenomenon that gas in the liquid is bubbled due to evaporation due to pressure drop.

  However, in this embodiment, in addition to the bubbles, the gas introduced from the gas introduction unit 4 is also mixed. Thereby, in the case of only evaporating bubbles from the liquid, the bubbles are not in a miniaturized state, but the bubbles can be refined by receiving pressure due to the insertion of the gas.

  The micro gas-containing liquid introduced into the diffusing section 2E through the converging cross section 2C is subjected to atmospheric pressure, the bubbles are further miniaturized by crushing and shearing, and the liquid is not brought into contact with each other. Is released, and when it collides with the weir plate 5A, it is further refined and released by ultrasonic vibration.

  As described above, in the present embodiment, the fine gas-containing liquid discharged from the spraying section 1 is made fine in the bubbles contained therein and further refined by ultrasonic vibration in the final discharge stage. Droplets.

  As a result, when a gas necessary for sterilization and sterilization such as viruses is included, the size of the droplet is extremely small even if it is used as a countermeasure against influenza in poultry farms, homes, or public places such as hospitals. It can be used as a humidifier having a small and simple configuration without causing problems such as wetting due to droplet adhesion.

  Also, even when supplying moderate humidity to prevent drying of tea leaves in the tea plantation, the liquid containing fine bubbles can be sprayed (mist state), which causes frost generation unlike water droplets. Therefore, it is possible to supply moisture in a state that is easy to evaporate and not to be sized so that moisture can be circulated well in the tea garden.

  Further, according to the present embodiment, the venturi structure is provided at the center of the swirling flow, and the configuration in which the gas is introduced in the direction perpendicular to the flow path at the center of the swirling flow is adopted. It is possible to reduce the space occupied by the gas-liquid mixing portion (the space indicated by the symbol L in FIG. 2) for obtaining a necessary mixed state of bubbles and liquid particles.

  Incidentally, for example, in a non-patent document relating to the prior art, as described in pages 88 to 89, if the structure is not a structure that speeds up the central part only by using the swirl flow as laminar flow, Unlike the embodiment, the space occupied by the above-described gas-liquid mixing section is generally longer in the sense that the laminar swirl flow is continued.

  In the above embodiment, the gas introduced from the gas introduction unit 4 is set for the purpose of sterilization or sterilization. However, in the present invention, silver ions may be included as a microbubble having a sterilizing action. it can.

  In this case, it is possible to apply silver plating to the gas introduction part 4 itself or to inject ionized silver. By using such a sterilizing component, for example, a sterilizing effect in water such as a pool or a bathtub can be expected.

It is an external view of the spray part used for the humidifier which is one of the microbubble generators by the Example of this invention. It is arrow sectional drawing of the direction shown by a code | symbol (2) in FIG. It is sectional drawing in the planar view state which extracted only the space part for gas-liquid mixing shown in FIG. It is a block diagram for demonstrating the gas concentration control mechanism used for a humidifier.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spraying part 2 Main-body part 2A Gas-liquid mixing space 2B Liquid flow constriction part 2C Convergence cross-section part 2E Concave part 3 Liquid introduction part 4 Gas introduction part 5 Diffusion part 5A Weir plate

Claims (9)

A main body with a gas-liquid mixing space;
A liquid introduction section for causing a swirl flow in the liquid introduced into the gas-liquid mixing space;
A liquid flow restricting portion comprising a convex portion projecting toward the swirl flow center position in the gas-liquid mixing space;
A liquid flow discharge portion that penetrates the liquid flow restricting portion and communicates the gas-liquid mixing space and the outside, and a gas introduction portion that introduces gas into the liquid flow discharge portion,
The liquid flow restricting portion is a convergent cross-sectional portion formed by converging sequentially from the gas-liquid mixing space side along the penetrating direction of the liquid flow discharge portion to form a minimum inner diameter portion and a large diameter portion continuous to the minimum inner diameter portion. Have
A microbubble generator characterized in that the tip opening of the gas introduction part is positioned and provided at a maximum flow velocity generation part that is generated by narrowing the liquid flow at the maximum convergence part in the convergence cross section. .   The tip opening of the gas introduction part is positioned in the vicinity of a converging cross-sectional part having a minimum inner diameter in the liquid flow constriction part or at a position not exceeding the minimum inner diameter part in the penetration direction. The microbubble generator described in 1.   3. Vibrating means for causing a high-frequency vibration by causing a liquid containing a gas refined in the gas introducing portion to collide with the liquid is disposed near the tip opening of the gas introducing portion. The microbubble generator described in 1.   The microbubble generator according to any one of claims 1 to 3, wherein oxygen or ozone gas is introduced from the gas introduction part.   The microbubble generator according to any one of claims 1 to 3, wherein the gas introduction part is configured as a corrosion-resistant part.   6. The microbubble generator according to claim 5, wherein the corrosion-resistant portion is subjected to a corrosion-resistant treatment using a corrosion-resistant material such as titanium alloy or glass or using a tetrafluoroethylene resin.   The microbubble generator according to claim 1, wherein a liquid corresponding to a use is selected and introduced into the liquid introduction unit.   The microbubble generator according to claim 6, wherein warm water is used as the liquid introduced into the liquid introduction part.   The microbubble generator according to claim 6, wherein ozone water is used as the liquid introduced into the liquid introduction part.

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