JPS6148970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microbubble generator, and more particularly to a microbubble generator that utilizes a turbulent region.

Conventionally, many types of devices for generating bubbles have been considered and put into practical use. For example, there are methods that generate bubbles by reducing the pressure in a liquid containing pressurized air, methods that use electrolysis, methods that use chemical reactions that generate gas, and methods that use ejectors and baffles. be. However, both methods had drawbacks such as excessive operating costs such as power costs and drug costs. For example, in the case of a device that combines an ejector and a baffle plate, in order to make the bubbles finer, the gas-liquid flow must collide with the baffle plate at a considerable speed, and the energy loss at this time is large. , an increase in operating costs cannot be avoided. Therefore, ejectors are generally only used for gas-liquid mixing.

Thus, it is an object of the present invention to provide a low power, 30 to 40
An object of the present invention is to provide a device that generates micron-sized bubbles.

Here, the present invention forms a constriction part in the fluid flow path,
This is a micro-bubble generating device in which a baffle plate whose vertical cross-sectional area becomes larger toward the downstream side is provided in the flow path, and gas is introduced into a negative pressure region generated downstream of the baffle plate.

That is, according to a preferred embodiment of the present invention, a baffle plate of a certain shape is provided in a liquid flow path with a high flow rate,
A negative pressure is generated on the downstream side, a gas such as air is introduced into this negative pressure region, and the introduced gas is atomized by the shearing force caused by the turbulence generated in the negative pressure region.

The cross-sectional shape of the fluid flow path and the structure of the baffle plate are not particularly limited as long as they provide a negative pressure region on the downstream side, but preferably, this flow path is narrowly constricted in the center, and there is a constriction approximately at the center of the constricted portion. A conical, pyramidal, or wedge-shaped baffle plate is provided with the bottom facing downstream.

The device according to the invention will now be further described in connection with the accompanying drawings, in which: FIG.

FIG. 1 is a schematic perspective view of the device of the present invention, and FIG. 2 is a schematic explanatory diagram of the internal structure, also partially broken away.

In FIG. 1, fluid supplied from a fluid inlet 2 to a microbubble generator 1 generates turbulent flow within the device, shearing and atomizing gas such as air supplied from a gas introduction pipe 3. Colloidal air, in which fine bubbles are uniformly dispersed in the liquid, is taken out from the fluid outlet 4 and appropriately led to a flotation tank (not shown). The inside can be observed through the peephole 5, which can be removed and used to replace the baffle plate when necessary. As can be easily seen from the internal structure schematically shown in FIG. 2, the gas atomization mechanism is such that the fluid in the flow path 21 of the micro bubble generator 20 first flows through the inner wall of the constriction section 22 in the flow path and the baffle plate. It flows into the slit portion 24 on the outer periphery of the baffle plate composed of 23, is accelerated, exits the slit portion 24, and forms a negative pressure region 25. In the illustrated example, the baffle plate 23 has a linear shape on the upstream side and a flat plate shape on the downstream side.

In the negative pressure region 25, turbulent flow is formed as indicated by arrows in the figure. On the other hand, a gas inlet 26 is provided in this negative pressure region, through which gas such as air is introduced from the outside. Since turbulence is formed in the negative pressure region as described above, the introduced gas is finely divided by the shearing force caused by the turbulence, and is uniformly dispersed within the fluid.

The colloidal air thus obtained is extracted from a more downstream fluid outlet.

The size of the microbubbles can be changed as appropriate by changing the degree of turbulence formed by changing the flow rate of the fluid, the shape of the baffle plate, or the cross-sectional shape of the constriction part.

In particular, the baffle plate provided at the center of the flow path can be easily removed from the viewing window, and by changing its shape as necessary, the size of the generated bubbles can also be changed.

The shape of the upstream side of the baffle plate may be only a point or a line, while the shape of the downstream side may be an arc or a polygon in cross section in addition to the above-mentioned flat plate shape, but a shape as close to a flat plate as possible is preferable.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an apparatus according to the present invention, and FIG. 2 is a partially exploded schematic perspective view illustrating the internal structure of the apparatus according to the present invention.

Claims (1)

[Claims] 1. A constriction part is formed in the fluid flow path, and a baffle plate is provided in which the cross-sectional area in the vertical direction becomes larger toward the flow path as it goes downstream, and gas is introduced into the negative pressure region generated downstream of the baffle plate. Micro bubble generator.