JPH0737702Y2 - Micro bubble generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fine bubble generating device using a gas-liquid mixing device for mixing liquid and gas with good dispersibility.

[Conventional technology]

Conventionally, an impeller is rotated in a container in which a liquid and a gas coexist to mix and stir, or a gas is sucked into the stock solution by combining an ejector and an injector, and then pressurized to dissolve the gas in the liquid, and a storage tank. The gas that could not be dissolved and the dissolved solution in which the gas was dissolved are separated, and the dissolved solution is depressurized and allowed to flow into the bubble tank to release the gas in the dissolved solution, thereby forming fine bubbles in the bubble tank. Although a fine bubble generator for generating is provided, the bubbles in the liquid are relatively large when simply mixed and stirred by the impeller or when the gas is sucked by the ejector. It was not possible to increase the amount of gas dissolved to the solubility which is the limit of dissolution, so the amount of bubbles generated in the bubble tank was relatively small.

[Problems to be solved by the device]

In view of the above-mentioned situation, the present invention is to solve the problem that when the liquid and the gas are mixed, the gas is made into minute bubbles to be uniformly dispersed and mixed to increase the contact area of the liquid and the gas. Another object of the present invention is to provide a fine bubble generator capable of generating a large amount of fine bubbles using a gas-liquid mixing device capable of producing the fine bubbles.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention pressurizes a stock solution sucking gas by an ejector with a pressure pump, and provides an inlet and an outlet at both ends of a cylindrical container together with a compressed gas generated by a compressor. At least one spiral right-hand screw and at least one left-hand screw
One or more are alternately provided at a predetermined interval so as to be coaxial and fixed, and the outer edges of both screws are supplied to the inflow port of the gas-liquid mixing device that is in close contact with the inner wall of the container, and gas is supplied in the gas-liquid mixing device. To dissolve and dissolve the solution flowing out from the outlet to a tank capable of releasing excess gas contained in the solution, and reduce the pressure of the solution from a supply port formed in the tank. Thus, a fine bubble generating device was constructed so that it could be taken out appropriately.

Further, by using a vortex type pressure pump having an impeller as an internal pressure pump, the gas sucked by the ejector can be mixed and stirred in the pump.

[Action]

The gas-liquid mixing device used in the micro-bubble generator of the present invention, the liquid and gas supplied from the inlet are guided forward while being rotated counterclockwise by the counterclockwise screw, and then rapidly rotated by the clockwise screw. Is phase-shifted clockwise to create a turbulent state, which mixes the liquid and gas, and is guided forward while being given a clockwise rotation, and then the left-handed screw again rapidly changes the phase to the counterclockwise direction. A turbulent flow state is created by mixing a liquid and a gas, and this is appropriately repeated to form the gas into minute bubbles to uniformly disperse and mix in the liquid.

In the device for producing fine bubbles of the present invention, the stock solution supplied to the ejector is pressurized by the pressure pump while sucking the gas into the ejector, and a part of the gas is dissolved in the liquid. In the case of using a vortex type pressure pump equipped with an impeller, it is agitated and mixed by the impeller to dissolve more, and the liquid in which gas is pre-dissolved and the compressed gas generated by the compressor are sent to the gas-liquid mixing device. While being uniformly agitated and mixed by a clockwise screw and a counterclockwise screw in the gas-liquid mixing device, an amount of gas which is close to the solubility which is a theoretical solubility limit according to the pressure by the pressure pump and the compressor is dissolved. A solution is made, and the solution is stored in a tank to release excess gas that could not be dissolved, and the solution is depressurized from the supply port of the tank. While by flowing into the bubble bath, a gas dissolved in the solution becomes once saturated,
It is opened as fine bubbles in the bubble tank.

〔Example〕

The present invention will be further described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 is an overall layout view of the fine bubble generator of the present invention, in which A is a gas-liquid mixing device, B is an ejector, C is a pressure pump, D is a compressor, and E is a storage tank. . In the fine bubble generator of the present invention, the undiluted solution supplied to the ejector B sucks the gas, is pressurized by the pressure pump C, and is further sent to the gas-liquid mixing apparatus A together with the compressed gas generated by the compressor D, and the liquid And the gas are mixed and dispersed uniformly to dissolve the gas in the liquid, the dissolved solution is sent to the storage tank E to be stored, the undissolved excess gas is released, and the dissolved solution is removed from the tank E. While decompressing, it is sent to a separately provided bubble tank to release the dissolved gas as fine bubbles. Further, the present invention will be specifically described below.

The gas-liquid mixing apparatus A has flanges 2 and 3 fixed to both open ends of a cylindrical container body 1 as shown in FIG. 2, and the flanges 2 and 3 each have an inlet 4 communicating with the inside.
And the outlet 5 is opened to form a container, and both ends of a supporting rod 6 arranged coaxially with the center of the container body 1 are fixed to the centers of the flanges 2 and 3, and the supporting rod 6 and The strip-shaped plate body 8 is spirally wound and fixed between the inner walls 7 of the container body 1 to form a left-handed screw 9 and a right-handed screw 10, which are alternately arranged at predetermined intervals. A plurality of them are provided. In this embodiment, the left-handed screws 9 and 9 are arranged on both sides, and the right-handed screw 10 is arranged in the middle of the structure. The number of turns of each screw is set to 1 turn or more, preferably to several turns, and the supporting rod is set. 6 is formed integrally with and is fitted into the container body 1.
It is also possible to separately form the left-handed screw 9 and the right-handed screw 10 and alternately insert and fix them in the container body 1. Further, the flanges 2 and 3 are formed with holes 12, ... For inserting the connecting bolts 11. Then, the liquid and gas introduced from the inflow port 4 are surrounded by the left-handed screw 9 or the right-handed screw 10 between the adjacent strip-shaped plate bodies 8 and between the support rod 6 and the inner wall 7 of the container body 1 in a spiral shape. It is made to rotate and flow along the space, and in the space 13 between the left-handed screw 9 and the right-handed screw 10, the direction of rotation is suddenly changed to disperse and mix. It is enhanced and promotes dissolution. Further, although not shown, the support rod 6 is rotated, that is, the counterclockwise screw 9 and the clockwise screw 10 are rotated in the same direction to partially generate a pressure difference in the fluid passing through the container body 1, It is also possible to promote the dispersion and mixing.

As shown in FIG. 3, the ejector B has a reduced diameter portion in which a nozzle 15 continuous to the inflow port 14 is formed in the central portion of the cylindrical container 16.
The cylindrical container 16 is provided with an inflow pipe 18 that projects in the axial direction toward the nozzle 17 and that introduces gas from the outside in the vicinity of the nozzle 15.
Flanges for connection at both ends of the tubular container 16.
It is a fixed piece of 19,19. The ejector B vigorously ejects the liquid supplied from the inflow port 14 from the nozzle 15 toward the reduced diameter portion 17 in the cylindrical container 16, and by the negative pressure and the diffusion of the jet flow at that time, The gas has a function of sucking gas from the inflow pipe 18, and the gas is taken into the liquid passing through the ejector B as relatively large bubbles. The inflow pipe 18 may be opened at the other end to take in air, or may be connected to a cylinder filled with a desired gas when air bubbles other than air are generated. It is possible.

The pressurizing pump C pressurizes the liquid sucking the gas by the ejector B to increase the amount of the gas dissolved in the liquid and supplies the liquid treated by the present apparatus to the bottom of a bubble tank provided separately. However, by using a vortex flow type in which an impeller is installed, it is possible to stir the liquid in a state where the gas from the ejector B is roughly mixed, and to further promote the dissolution of the gas. . The ultimate pressure of the pressurizing pump C is 5 to 5.
It has a performance of 10 kg / cm ² .

The compressor D is for compressing the gas and joining it into the liquid containing the gas pressurized by the pressure pump C. The compressed gas is compressed according to the pressure of the liquid pressurized by the pressure pump C. The pressure can be set appropriately. When a gas other than air is used, it can be sucked from a cylinder filled with a desired gas and compressed, and in this case, it is also used as the cylinder to be supplied to the ejector B.

The storage tank E stores the liquid in which the gas is dissolved by the gas-liquid mixing device A in a pressurized state and releases the undissolved excess gas from the air out silencer 20 provided at the upper end to the outside. . When air or an inexpensive and harmless gas is used as the gas, it can be directly discharged into the atmosphere, but when other gas is used, the discharge port 21 of the air out silencer 20 is used. It shall be connected to a recovery tank (not shown) for recovery.

Next, the overall structure of the fine bubble generator of the present invention will be described with reference to FIG. 1. The ejector B is provided with a liquid supply pipe 22 for supplying or recovering the same liquid as the liquid filled in the bubble tank. Of the ejector B is connected to the suction side of the pressure pump C, and the discharge side of the pressure pump C is connected to the compressed gas from the compressor D. A connecting pipe 25 provided with a branch pipe 24 which joins and connects the air supply pipe 23 for supplying the gas is further connected to the inlet 4 side of the gas-liquid mixing apparatus A by using the flange 2 and the bolt 11. In addition to the connection, the flange 3 is used on the outflow port 5 side, and the storage tank E is connected via a connection pipe 26 provided with conversion flanges having different dimensions at both ends,
A supply port 28 having a pressure reducing valve 27 provided in the storage tank E is connected to a supply pipe 29 for supplying a liquid in which a gas is dissolved to a bubble tank for generating bubbles. still,
The connecting pipe 25 need not be provided in particular, and the pressurizing pump C is directly connected to the gas-liquid mixing apparatus A, and the air supply pipe 23 from the compressor D is connected to the inlet 4 of the gas-liquid mixing apparatus A.
It is also possible to connect to a branch pipe formed in the vicinity of, and the connecting pipe 26 can be omitted.

Therefore, the device for generating fine bubbles of the present invention is configured to include the ejector B.
The undiluted solution supplied to is pressurized by a pressure pump C in a state where the gas is sucked in through the inflow pipe 18, and a part of the gas is dissolved in the liquid. Particularly, the vortex flow type in which an impeller is installed as the pressure pump C. When a pressurizing pump is used, it is agitated and mixed by the impeller to dissolve more, and the gas is sent to the gas-liquid mixing device A together with the pre-dissolved liquid and the compressed gas generated by the compressor D. Then, in the gas-liquid mixing device A, the liquid and gas press-fitted from the inflow port 4 are guided forward while being given counterclockwise rotation by the counterclockwise screw 9, and then pass through the space 13 and the clockwise screw 10 Then, the rotation direction is rapidly phase-shifted clockwise to create a turbulent state to mix the liquid and gas, and after being guided forward while being given clockwise rotation, it passes through the space 13 and is rotated counterclockwise by the screw 9. The phase is rapidly changed again counterclockwise to create a turbulent state, and the liquid and gas are mixed, and this is repeated appropriately to form gas into minute bubbles to uniformly disperse and mix in the liquid. A solution in which an amount of gas close to the solubility, which is the theoretical solubility limit, is dissolved according to the pressure by the pressure pump C and the compressor D is prepared. Then, the dissolved liquid is stored in the storage tank E, and excess gas that cannot be dissolved is released from the air out silencer 20.
By injecting the solution into the bubble tank from the supply port 28 while decompressing the solution with the decompression valve 27, the gas dissolved in the solution in the supply pipe 29 and the bubble tank is saturated at once, and bubbles are formed as fine bubbles. It is opened in the tank.
As a result, the diameter of the bubbles generated by the fine bubble generator of the present invention is as small as 2 to 5 μm in the case of air bubbles in water according to the calculation using the Stokes equation in the fluid. It was found that the amount generated was much higher than that of the conventional one.

The microbubble generator of the present invention is used for various purposes, and an example of application to a tank for transporting live fish from a catching place to a restaurant or a tank for temporarily culturing live fish is shown in FIG. In the figure, P indicates a fine bubble generator, which is adapted to supply a dissolving solution in which air is dissolved from the pressure reducing valve 27 to the bottom of the water tank 30 through a supply pipe 29. The dissolved air becomes saturated in the culture water 31 in the water tank 30 and is released as fine bubbles 32. This bubble 32
Since is extremely fine, the rising speed is slow and it stays in the aquaculture water 31 for a long time and diffuses in the horizontal direction, and the oxygen concentration of the aquaculture water 31 can be optimally set for fish. A net 34 is hung around the inside of the water tank 30 at a predetermined distance from the side wall 33 to prevent live fish from colliding with and damaging the side wall 33. Then, this aquarium 30 is installed in a truck or installed in a restaurant.

In general, fine bubbles have a property of adsorbing a substance and a property of causing a pressure change when the bubble bursts, and the pressure change has a larger property as the bubble is smaller. Other uses for these properties include:
There are purification, washing and washing of water to separate and remove floating impurities by adsorption, floating, etc., and sterilization and deodorization of stored water by bubbles of ozone, and fermentation by sending air bubbles into the fermentation tank. Its uses are enumerated, and its uses are enumerated.

[Effect of device]

According to the gas-liquid mixing device used in the fine bubble generator of the present invention, the liquid and gas supplied from the inlet are guided to the front while being rotated counterclockwise by the counterclockwise screw in the cylindrical container, and then the clockwise screw. , Abruptly phase-shifts the direction of rotation to create a turbulent state, mixes liquid and gas, guides it forward while giving clockwise rotation, and then again turns the direction of rotation abruptly counterclockwise with a counterclockwise screw. The liquid and gas can be mixed by creating a turbulent state by phase conversion, and by repeating this appropriately, the gas is made into extremely minute bubbles, uniformly dispersed and mixed in the liquid, and continuously taken out from the outlet. It is possible,
Moreover, its structure is simple, compact and inexpensive to manufacture, and it always operates regardless of the pressures of the liquid and gas supplied.

Then, according to the fine bubble generator of the present invention, gas is sucked into the undiluted solution supplied thereto by the ejector, and in that state, pre-dissolving is performed by pressurizing with a pressure pump to dissolve a part of the gas into the liquid. After that, the liquid containing the gas and the compressed gas generated by the compressor are sent to a gas-liquid mixing device, and the counterclockwise screw and the clockwise screw uniformly agitate and mix to dissolve the gas. It is possible to dissolve a quantity of gas close to the solubility, which is the theoretical limit of dissolution according to the pressure of the compressor, into a liquid, and as a result, the dissolved solution is decompressed and allowed to flow into the bubble tank, thereby generating a large amount of fine bubbles. It can be efficiently generated.

Furthermore, when a vortex type pressure pump having an impeller installed therein is used as the pressure pump, a larger amount of gas can be dissolved in the liquid by stirring and mixing with the impeller.

[Brief description of drawings]

FIG. 1 is an overall layout view of the fine bubble generator of the present invention, and FIG.
Figure is a cross-sectional view of the gas-liquid mixing device used in the micro-bubble generator
FIG. 3 is a sectional view of the ejector, and FIG. 4 is a simplified sectional view of an aquarium of live fish constructed by using the fine bubble generating device of the present invention. A: Gas-liquid mixing device, B: Ejector, C: Pressurizing pump, D: Compressor, E: Storage tank, 1: Container body, 2: Flange,
3: Flange, 4: Inlet, 5: Outlet, 6: Support rod, 7: Inner wall,
8: band-shaped plate, 9: counterclockwise screw, 10: clockwise screw, 11: bolt, 12: hole, 13: space, 14: inlet, 15: nozzle, 16: cylindrical container, 17: reduced diameter part , 18: Inflow pipe, 19: Flange, 20: Air out silencer, 21: Outlet port, 22: Liquid supply pipe, 23: Air supply pipe, 24: Branch pipe, 25: Connection pipe, 26:
Connection pipe, 27: Pressure reducing valve, 28: Supply port, 29: Supply pipe, 3
0: Aquarium, 31: Aquaculture water, 32: Bubble, 33: Side wall, 34: Net.

Claims (2)

[Scope of utility model registration request] 1. An undiluted solution in which a gas is sucked by an ejector is pressurized by a pressure pump, and an inlet and an outlet are provided at both ends of a tubular container together with a compressed gas generated by a compressor, and a spiral-shaped right is provided inside. At least one rotating screw and at least one counterclockwise screw are alternately and coaxially fixed at a predetermined interval, and the outer edges of both screws are supplied to the inlet of the gas-liquid mixing device in close contact with the inner wall of the container. Then, in the gas-liquid mixing device, a dissolved solution is prepared by mixing and dissolving gas, and the dissolved solution flowing out from the outlet is guided to a tank capable of releasing excess gas contained in the dissolved solution and stored therein. A fine air bubble generator characterized in that the solution is decompressed from the supply port formed in the above and can be appropriately taken out. 2. The fine bubble generator according to claim 1, wherein a vortex type pressure pump having an impeller installed therein is used as the pressure pump.