JP5038600B2 - Microbubble generator - Google Patents

Description

  The present invention relates to a fine bubble generating device that generates fine bubbles by pulverizing bubbles in a gas-liquid mixed solution with a decompression and pressurizing means.

  2. Description of the Related Art Conventionally, there has been known a fine bubble generating device that generates fine bubbles by pulverizing bubbles in a gas-liquid mixed solution with a decompression and pressurizing means (see, for example, Patent Document 1).

  The conventional microbubble generator disclosed in Patent Document 1 is provided with a depressurizing / pressurizing means in the flow path of the gas-liquid mixture, and the depressurizing / pressurizing means of the depressurizing / pressurizing means is used to reduce the bubbles in the gas-liquid mixed liquid. It is pulverized by a shearing force generated by pressure to generate fine bubbles. Fine bubbles are bubbles with a diameter of 1 mm or less (especially about several μm to several tens of μm), which are difficult to rise in the liquid and have a large surface area per volume. is there.

By the way, in the conventional fine bubble generating apparatus, the fine bubbles generated by pulverizing by the pressure reducing / pressurizing means collide with each other and are connected to generate many larger bubbles. In order to prevent the generation of a large number of large bubbles, it is effective to reduce the chance of collision between the fine bubbles, and it is conceivable to prevent the generated fine bubbles from being concentrated in one place.
Japanese Patent No. 2722373

  The present invention was invented in view of the above-described conventional problems, and the object of the present invention is that fine bubbles generated by pulverization by a pressure reducing / pressurizing means collide in one place. It is an object of the present invention to provide a fine bubble generating device that prevents a large number of larger bubbles from being generated.

In order to solve the above problems, a fine bubble generating apparatus of the present invention is a fine bubble generating apparatus that generates fine bubbles by pulverizing bubbles in a gas-liquid mixed solution with a decompression and pressurizing means 1. plurality venturi 11 b as a pressure reducing and pressure means 1 b on the downstream side in parallel to the flow path 2, the plurality of upstream of the pressure reducing and pressure means upstream of the core flow channel 2a of the venturi tube 11b A venturi pipe 11a is provided as 1a, and the cross-sectional area of the venturi pipe 11b as the downstream pressure reducing / pressurizing means 1b is made smaller than the cross-sectional area of the venturi pipe 11a as the upstream pressure reducing / pressurizing means 1a. It is characterized by comprising.

With such a configuration, it is possible to suppress the generation of a large number of large bubbles due to a large number of fine bubbles concentrating at one place and colliding with each other. Furthermore, after the bubbles in the gas-liquid mixed liquid are pulverized by the upstream venturi tube 11a into small bubbles to some extent, the fine bubbles can be further refined by the downstream venturi tube 11b. It is possible to generate fine bubbles. Furthermore, if the total cross-sectional area of the plurality of downstream venturi pipes 11b is formed to be the same as the cross-sectional area of the upstream venturi pipe 11a, the flow rate (except in the venturi pipes 11a and 11b) can be changed by design. There is no need to consider.

  The present invention can suppress the generation of a large number of large bubbles due to a large number of fine bubbles colliding with each other and colliding with each other, and can generate a large amount of fine bubbles.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The microbubble generator is mainly composed of a venturi tube 11 as the pressure reducing / pressurizing means 1, and for example, a suction port at one end and a discharge port at the other end are opened to a water tank such as a bathtub to communicate with each other. As shown in FIG. 2, the gas-liquid mixed liquid in which the gas is taken into the liquid in order from the upstream side (suction port side) to the downstream side (nozzle side) and bubbles are mixed in the liquid is obtained. A gas intake unit 3 for generating, a pump for pressurizing the gas-liquid mixed solution, a decompression / pressurizing means 1 for pulverizing bubbles in the gas-liquid mixed solution to generate fine bubbles, and a bath for fine bubbles Nozzle 4 for discharging is provided.

  The gas intake unit 3 includes, for example, an intake valve having an ejector mechanism, and when the liquid flows through the flow path 2 by driving the pump, the external air is taken into the liquid by the ejector effect and gas (bubbles) is mixed therein. There are no particular limitations. Examples of the gas include, but are not limited to, oxygen, ozone, and air. Although what is taken in in a liquid and mixing gas is mentioned, It does not specifically limit.

  The gas-liquid mixed liquid passes through the pump and is then sent to the decompression / pressurization means 1.

  In this embodiment, the decompression / pressurization unit 1 is formed in two stages, ie, an upstream decompression / pressurization unit 1a and a downstream decompression / pressurization unit 1b. As shown in FIG. 3, the upstream pressure reducing / pressurizing means 1 is provided with one venturi tube 11a as a part of the flow path 2 (main flow path 2a). As shown in FIG. 1, the downstream pressure reducing / pressurizing means 1 branches the downstream side of the flow path 2 from the portion where the upstream pressure reducing / pressurizing means 1 is provided into a plurality of branch flow paths 2b. Each of the branch channels 2b is provided with a venturi tube 11b. In the present embodiment, the downstream venturi tube 11b is formed in accordance with the diameter of the microbubbles generated so as to be 1/2 of the diameter of the upstream venturi tube 11a and the cross-sectional area is 1/4. Four flow paths 2b are formed, and each branch flow path 2b is provided with a venturi pipe 11b, and the total cross-sectional area of the downstream venturi pipe 11b is equal to the cross-sectional area of the upstream venturi pipe 11a. .

  In the venturi tube 11, when the bubble passes through the throat portion, the flow velocity becomes faster and the pressure is reduced and the bubble expands. After that, the bubble is pressurized and contracted as the cross-sectional area increases. And fine bubbles are generated. When the generated fine bubbles are concentrated at one place, they are connected to become larger bubbles. Therefore, in the present invention, the branched bubbles 2b are branched into the plurality of branch channels 2b and are downstream of the branch channels 2b. By providing, it is possible to suppress the generation of large bubbles due to many fine bubbles concentrating at one place and colliding with each other.

  Further, in this embodiment, the venturi tube 11a is provided upstream of the downstream venturi tube 11b and is configured in two stages. First, the bubbles in the gas-liquid mixture are crushed by the upstream venturi tube 11a. After making the microbubbles small to some extent, the small microbubbles can be further refined in the downstream venturi tube 11b to prevent them from being connected, and a large amount of microbubbles can be generated. At this time, the total cross-sectional area of the plurality of downstream venturi pipes 11b formed by making the respective cross-sectional areas of the downstream venturi pipes 11b smaller than the cross-sectional area of the upstream venturi pipe 11a is determined as the upstream venturi pipe 11b. Since it is formed to have the same cross-sectional area as the tube 11a, it is not necessary to consider changes in the flow velocity (except in the venturi tubes 11a and 11b) in design.

  FIG. 4 shows another embodiment of the present embodiment. In the present embodiment, on the downstream side of the first venturi tube 11a provided in the basic flow path 2a, a second decompression / pressurization means 1b including a plurality (four) of venturi tubes 11b provided in parallel is provided. Further, a third decompression / pressurization means 1c composed of a plurality of (four) parallel venturi pipes 11c is provided on the downstream side, and is configured in three stages. As a result, after the bubbles in the gas-liquid mixture are pulverized in the first venturi tube 11a to make small bubbles of a certain degree, the small bubbles of a certain degree are further refined in the second venturi tube 11b. Can be further suppressed, and further, the fine bubbles can be further refined in the third venturi tube 11c and the connection of these can be suppressed, thereby generating a larger amount of fine bubbles. be able to.

The downstream pressurization / decompression means, which is the main part of the microbubble generator according to one embodiment of the present invention, is shown, (a) is a side sectional view, and (b) is a front sectional view. It is a schematic whole block diagram of a microbubble generator. The pressurizing / depressurizing means on the upstream side of the fine bubble generating apparatus is shown, (a) is a side sectional view, and (b) is a front sectional view. It is a sectional side view of the principal part of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure reduction / pressurization means 11 Venturi pipe 2 Flow path 3 Gas intake part 4 Nozzle

Claims (1)

A fine bubble generating device that generates fine bubbles by crushing bubbles in a gas-liquid mixture with a decompression / pressurization means, and a venturi tube as a decompression / pressurization means on the downstream side is arranged in parallel with a liquid flow path. A plurality of Venturi pipes as upstream pressure reducing / pressurizing means provided in the upstream flow path of the plurality of Venturi pipes, and the respective cross-sectional areas of the Venturi pipes as downstream pressure reducing / pressurizing means Is made smaller than the cross-sectional area of a venturi tube as pressure reducing / pressurizing means on the upstream side .

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