KR20030063776A - minute an air bubble generation device - Google Patents

Abstract

PURPOSE: Provided is an apparatus for generating micro fine air bubbles which has a simple and safe structure and can continuously and stably generate micro fine air bubbles. CONSTITUTION: The apparatus includes a liquid conduit having a gas inlet near downstream end; a pump disposed at the downstream end of the liquid conduit to generate an air-liquid mixture using the gas introduced from the gas inlet by pressure upon driving; a statutory mixer disposed at the outlet of the pump to mix and stir the air-liquid mixture generated in the pump and produce micro fine air bubbles. The statutory mixer has a screw part at the upstream and a cutter part at the downstream side. The screw part has a main body, a sectional rod, a spiral blade and a plurality of protrusions.

Description

Ultra-fine bubble generation device {minute an air bubble generation device}

The present invention relates to an ultra-fine bubble generator for generating a gas-liquid mixture having ultra-fine bubbles, and more particularly, to an ultra-fine bubble generator suitable for application to a bubble massage bath.

In general, a bubble bath or a jet bath is used for a hot bath device such as a large bathhouse or a curehouse, and these methods emit air to bathe. It is called bubble massage bath. In addition, the bubble massage bath is classified according to the size of the bubble, the bubble diameter of the bubble bath is about 2 to 10mm, the bubble diameter of the pressure bath is 0.2 to 2mm.

By the way, the bubble makes a myriad of movements during the warm bath, and in the process, the bubble bursts, binds, and separates repeatedly, and then sound waves are generated. The larger the diameter of the bubble is, the lower the frequency of the oscillated sound wave is, and conversely, the smaller the diameter is, the higher the bubble is.

The sound waves oscillated by the bubbles during the warm bath are emulsified, washed, and heated to the human body in the bathing. The effect is stronger as the frequency increases due to the frequency of the oscillating sound waves. For this reason, the development of the bubble generator which can generate the bubble of a small diameter as possible is calculated | required.

Fig. 7 shows a conventional bubble generator developed for this purpose, which comprises an ultra high pressure pump 1, an air compressor 2, a pressure tank 3 having an air discharge valve 4 and a pressure reducing valve. (5), the water inside the bath (7) drawn from the inlet (6) by the start of the ultrahigh pressure pump (1) together with the high pressure air from the air compressor (2) inside the pressure tank (3). To be supplied to the In the pressure tank 3, air becomes a gas-liquid mixture dissolved in water in a supersaturated state, and the gas-liquid mixture is discharged into the tub 7 through the pressure reducing valve 5 and the discharge port 8. By releasing under normal pressure, the air dissolved by supersaturation is discharged to the bathtub 7 as fine bubbles.

In the conventional bubble generator, since a large-sized, high-pressure pump (1), air compressor (2), pressure tank (3), and the like require equipment that requires attention to handling, it is necessary to ensure safety with skill in operation. There is a problem in that a facility is required, and bubbles generated are about 3 µm in diameter and smaller bubbles cannot be generated.

The present invention has been made in view of the present situation, and an object thereof is to provide an ultra-fine bubble generating apparatus that is easy to handle, has high safety, and can continuously generate small bubbles of about 3 µm or less.

Another object of the present invention is to provide an ultra-fine bubble generator capable of continuously generating a stable gas-liquid mixture.

It is still another object of the present invention to provide an ultra-fine bubble generator which can stably generate ultra-fine bubbles at low pressure due to its simple structure.

Another object of the present invention is to provide an ultra-fine bubble generator that can generate ultra-fine bubbles more stably.

It is still another object of the present invention to provide an ultra-fine bubble generator that can stably discharge ultra-fine bubbles inside a bathtub even when the bathtub and the stationary mixer are separated.

BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram which shows the ultra-fine bubble generator which concerns on one Embodiment of this invention.

2 is a cross-sectional view showing a configuration around a pump.

3 is an explanatory diagram showing a configuration of a stationary mixer.

4 is an explanatory diagram showing a mechanism of ultrafine bubble generation in a cutter section;

5 is a cross-sectional view showing the configuration of a discharge nozzle.

6 is an enlarged view of a main part of FIG. 5;

7 is a configuration diagram showing a conventional bubble generator.

<Description of the symbols for the main parts of the drawings>

11: ultra-fine bubble generator 12: pump

13: static mixer 14: air inlet

15 liquid piping 16: bathtub

17: bathtub water 19: discharge nozzle

20 outlet pipe 21 centrifugal pump

21a: casing 21b: impeller

22: air 23: gas-liquid mixture

24: connector 25: screw portion

26 cutter portion 27 ultra-fine gas-liquid mixture

28, 31: main body 29: compartment rod

30: spiral wing 32: projection

32a: shaft portion 32b: head portion

33 case 34 valve seat

35 valve 36 support member

37: operation rod 38: operation handle

In order to achieve the above object, the present invention provides a gas-liquid mixture by introducing a gas from the gas introduction portion using a liquid pipe having a gas introduction portion in the vicinity of the downstream end and a negative pressure during driving and attached to the downstream end of the liquid piping. It is characterized in that the stationary mixer for producing a gas-liquid mixture having ultra-fine bubbles by stirring and mixing the pump and the gas-liquid mixture generated in the pump and disposed on the outlet side of the pump. In addition, since the gas-liquid mixture is generated in the pump, the gas-liquid mixture is further stirred and mixed in the stationary mixer, so that small bubbles of about 3 µm or less can be continuously generated. Moreover, since the device is a simple structure mainly composed of a pump and a stationary mixer, handling is easy and safety is high.

The present invention comprises a stationary mixer comprising an upstream screw portion and a downstream cutter portion, wherein the screw portion is formed in a cylindrical main body, a partition rod disposed at the center of the main body, and a ring flow path between the main body and the partition rod. In addition to the configuration of the spiral blades arranged, the cutter portion is characterized in that it is composed of a cylindrical main body and a plurality of protrusions protruding toward the center on the inner peripheral surface of the main body. As a result, the gas-liquid mixture from the pump is supplied to the cutter portion as a swirling flow which is accelerated by being given a turning force and a centrifugal force while passing through the screw portion. In this swirling flow, the bubbles burst and become fine each time they collide with the projections, so that ultra-fine bubbles can be stably generated at low pressure. Moreover, the structure is simple, so there are few breakdowns and easy to maintain.

The present invention is also characterized in that the projection is constituted by a head portion forming a substantially mushroom-shaped hemispherical shape provided at the protruding tip portion of the shaft portion and the shaft portion. By the way, the swirl flow from a screw part is a multi-layer swirl flow which turns into a gas-liquid mixture with a small amount of bubbles contained in the outer diameter side, ie, a gas-liquid mixture with a large amount of bubbles contained in the center side. For this reason, since the bubble ruptures and refine | miniaturizes more effectively by having a head part in the protruding tip of an axial part, it becomes possible to produce | generate ultra-fine bubble more stably.

The present invention is further characterized in that a discharge nozzle capable of adjusting the pressure inside the outlet pipe is provided at the downstream end of the outlet pipe of the stationary mixer, and the discharge nozzle and the liquid pipe are connected to the bathtub. As a result, even when the bath and the stationary mixer are separated, it is possible to stably discharge the ultra-fine bubbles inside the bath.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

1 shows an ultra-fine bubble generator in accordance with an embodiment of the present invention, wherein the apparatus 11 is a mixture of a pump 12 that produces a gas-liquid mixture and a gas-liquid mixture from the pump 12 by stirring and mixing The static mixer 13 which produces | generates the gas-liquid mixture which has a micro bubble is provided, The bathtub 16 is provided in the inlet side of the said pump 12 through the liquid piping 15 which has the air inlet 14 near the downstream end. The tub water 17 inside is supplied from the inlet port 18, and the gas-liquid mixture generated by the stationary mixer 13 is discharged through an outlet pipe 20 having a discharge nozzle 19 at a downstream end thereof. The tub 16 is discharged into the inside.

The pump 12 is composed of a centrifugal pump 21 composed of a vortex casing 21a and an impeller 21b rotating inside the casing 21a, as shown in FIG. The centrifugal pump 21 sucks air 22 from the air inlet 14 by the negative pressure caused by the rotation of the impeller 21b, and the gas-liquid mixture 23 of the bath water 17 and the air 22 is sucked. Create

That is, the air inlet 14 has its proximal end inserted into a position approximately to the center of the liquid pipe 15, and the air 22 has the liquid pipe 15 due to the negative pressure caused by the start of the centrifugal pump 21. It is intended to be sucked and released from the outside with respect to its approximately center position. And the gas-liquid mixture 23 produced by the centrifugal pump 21 is sent to the stationary mixer 13 through the connecting pipe 24.

The stationary mixer 13 is composed of an upstream screw portion 25 and a downstream cutter portion 26, as shown in FIG. 3, and the gas-liquid mixture 23 from the centrifugal pump 21 is connected to the screw portion. The ultra-fine gas-liquid mixture (27) receives the turning force and the centrifugal force at the same time, and breaks and refines the bubbles in the gas-liquid mixture 23 in the cutter section 26 to finally contain small bubbles having a diameter of about 0.5 to 3 m. ) Is sent out to the outlet pipe 20.

As shown in FIG. 3, the screw portion 25 includes a cylindrical main body 28, a partition rod 29 disposed at the center of the main body 28, a main body 28 and a partition rod 29. It consists of a spiral blade 30 disposed inside the ring-shaped flow path between the, and the gas-liquid mixture 23 flowing through the ring-shaped flow path is a swirl flow accelerated by the influence of the rotational force and strong torsion by the spiral blade (30) It is sent to the cutter part 26.

3 and 4, the cutter portion 26 has a cylindrical body 31 having the same diameter as the main body 28 of the screw portion 25, and a center of the inner circumferential surface of the main body 31. It consists of a plurality of protrusions 32 protruding toward each other, each projection 32 is installed in the shaft portion 32a protruding from the inner circumferential surface of the main body 31, the protruding tip portion of the shaft portion 32a and is roughly mushroom-like It consists of the head part 32b which comprises. By providing the head portion 32b at the protruding tip portion of the shaft portion 32a, a large amount of fine bubbles can be generated using cavitation as described later.

On the other hand, the discharge nozzle 19 is provided with a case 33 attached to the bottom of the tub 16 and opened toward the tub 16, as shown in FIG. Inside the case 33, a valve seat 34 that is continuously installed at the downstream end of the outlet pipe 20 is firmly installed, and as shown in FIGS. 5 and 6, the valve seat 34 has a valve. The 35 is moved in the axial direction so as to be detached from the sheet.

That is, the support member 36 is attached to the valve seat 34, and the male screw portion 37a formed on the support member 36 is screwed to the male screw portion 37a formed on the operation rod 37. The valve 35 is rotatably attached to one end of the rod 37, and the operation handle 38 is firmly provided at the other end of the operation rod 37. Then, by holding the operation handle 38 and rotating the operation rod 37 forward and backward, the distance between the valve seat 34 and the valve 35 is adjusted to control the opening degree of the discharge nozzle 19. Can be.

The operation of the present embodiment configured as described above will be described.

When the centrifugal pump 21 is started, the impeller 21b rotates inside the casing 21a, and the inlet side of the centrifugal pump 21 becomes negative pressure. As a result, the tub water 17 in the tub 16 is supplied to the centrifugal pump 21 through the liquid pipe 15, and at the same time, the air 22 is sucked through the air inlet 14 and the tub water is It is supplied to the centrifugal pump 21 with (17). And inside the centrifugal pump 21, the bathtub water 17 and the air 22 are stirred and mixed, and the gas-liquid mixture 23 is produced.

By the way, since the impeller 21b rotates inside the casing 21a, the centrifugal pump 21 cut | disconnects and subdivides the air 23 in the gas-liquid mixture 23 by the impeller 21b. For this reason, unlike the pump of other structure, the gas-liquid mixture 23 which has subdivided bubbles of about 0.1-0.5 mm can be obtained.

The gas-liquid mixture 23 thus produced is sent to the stationary mixer 13 through the connecting tube 24 and further stirred and mixed in the stationary mixer 13. This produces the ultrafine gas-liquid mixture 27 having ultrafine bubbles of about 0.5 to 3 µm.

That is, the gas-liquid mixture 23 from the connecting pipe 24 is first led to the screw portion 25. Since the screw part has a structure in which a spiral blade 30 is disposed inside the ring-shaped flow path between the main body 28 and the partition rod 29, the gas-liquid mixture 23 while the gas-liquid mixture 23 passes through the ring-shaped flow path. Is accelerated by the rotational force and strong torsion. Moreover, the swirl flow is the gas-liquid mixture 23 (the gas-liquid mixture 23 containing almost no air 22 on the outer diameter side) due to the action of the centrifugal force, and the gas-liquid mixture 23 (the air 22 on the inner diameter side). It becomes what is called multi-layer swirl flow which becomes the gas-liquid mixture 23) containing a large amount of).

As a result, the gas-liquid mixture 23 in the cutter portion 26 has a bottom portion 39 containing a large amount of air 22 in the shaft portion, as shown in FIGS. 3 and 4. The outer circumferential side is a multilayer of so-called concentric circles, in which the fluid 40 in which the bath water 17 and the air 22 are mixed in a medium and the fluid 41 containing little of the air 22 are swung at high pressure. Phase turns. As a result, a large amount of vortex of turbulence occurs between the inside and the outside of the flowing water.

By the way, since the projection 32 protrudes in the inner peripheral part of the main body 31 of the cutter part 26, the flowing water 41 which hardly contains the air 22 is attached to the shaft part 32a of the projection 32. The air 22 is finely bubbled by the collision.

On the other hand, the fluid 40 in which the bathtub water 17 and the air 22 are mixed to the middle becomes fine particles which collide with the head part 32b of each protrusion 32, and cavitation occurs, Microbubbles are generated.

In addition, since the bubble particle in the multi-layer swirl flow which flows inside the cutter part 26 has the centrifugal force toward the outer diameter side of the main body 31, and the center force toward the axial center side of the main body 31, the fine particle of a high density is carried out. While facing the outer diameter side of the main body 31, the fine particles having a small density are directed toward the axial center side of the main body 31. As a result, collisions of these fine particles are repeated, resulting in an ultrafine gas-liquid mixture 27 having ultrafine bubbles of about 0.5 to 3 μm at the downstream end of the cutter portion 26. In addition, the stirring mixing time in the stationary mixer 13 is set to about 0.04-0.4 second.

The ultra-fine gas-liquid mixture 27 thus produced is discharged from the discharge nozzle 19 into the bathtub 16 through the outlet side pipe 20 and the discharge nozzle 19, and after the inside of the bathtub 16 is discharged. It becomes cloudy in about 2-3 minutes.

By the way, when the stationary mixer 13 and the bathtub 16 are separated and the outlet pipe 20 is long, when the pressure inside the outlet pipe 20 is atmospheric pressure, ultrafine in the outlet pipe 20 is achieved. The microbubbles in the gas-liquid mixture 27 may be bonded to each other to form large bubbles.

However, in this embodiment, since the discharge nozzle 19 which can adjust the opening degree is provided in the downstream end of the outlet side piping 20, the pressure inside the outlet side piping 20 is about 2.5 kg / cm <2>. Adjusted. For this reason, the microbubble bubbles of the ultrafine gas-liquid mixture 27 can be discharged to the bathtub 16 as ultrafine bubbles without being bonded to each other inside the outlet-side piping 20.

By the way, according to this embodiment, since the centrifugal pump 21 and the stationary mixer 13 were combined to perform stirring mixing of gas liquid, it is possible to generate ultra fine bubbles with a simple device configuration. Moreover, since high pressure is not required, safety is high.

In addition, in the said embodiment, although the case where it applied to the bathtub 16 was demonstrated, it is similarly applicable to the waste water treatment apparatus, mixing apparatuses, such as a carbon dioxide gas and ozone.

The ultra-bubble generating device according to the present invention is a liquid pipe having a gas inlet near the downstream end, and attached to the downstream end of the liquid pipe and introduces gas from the gas inlet by using a negative pressure during driving to generate a gas-liquid mixture Since the pump and the gas-liquid mixture produced at the pump, which is disposed at the outlet side of the pump, are mixed by stirring, a stationary mixer is formed to produce a gas-liquid mixture having ultra-fine bubbles, so that small bubbles of about 3 μm or less are continuously generated. Furthermore, since the device is a simple structure mainly composed of a pump and a stationary mixer, it is easy to handle and high in safety.

In the present invention, since the pump is composed of a centrifugal pump having a vortex casing and an impeller rotating inside the casing, the gas in the gas-liquid mixture is cut and subdivided by the blades of the rotating impeller, and is 0.1 to 0.5. A gas-liquid mixture having a granular bubble of about mm can be obtained continuously and stably. For this reason, the size of the bubble obtained by a static mixer can be made smaller.

The present invention further comprises a stationary mixer comprising a screw portion on an upstream side and a cutter portion on a downstream side, wherein the screw portion includes a cylindrical main body, a partition rod disposed at the center of the main body, and a ring-shaped flow path between the main body and the partition rod. In addition to being composed of spiral blades arranged inside, the cutter is composed of a cylindrical main body and a plurality of protrusions protruding toward the center on the inner circumferential surface of the main body. Can be generated reliably. Moreover, the structure is simple, so there are few failures and it is easy to maintain.

In the present invention, since the projection is provided at the shaft and the protruding tip of the shaft, the mushroom-like hemispherical shape is constituted by the id portion, so that the bubbles in the gas-liquid mixture are more effectively cut and refined, and ultrafine bubbles having a size of about 0.5 to 3 µm are formed. Can be generated stably.

Further, the present invention further provides a discharge nozzle capable of adjusting the pressure inside the outlet pipe at the downstream end of the outlet pipe of the stationary mixer, and connects the discharge nozzle and the liquid pipe to the bath. Even if present, the ultrafine bubbles can be stably discharged inside the bathtub.

Claims (4)

A liquid pipe having a gas inlet near the downstream end, a pump attached to the downstream end of the liquid pipe and introducing gas from the gas inlet using a negative pressure during driving to generate a gas-liquid mixture, and disposed at the outlet side of the pump; Ultra-bubble bubble generator characterized in that it comprises a stationary mixer for stirring and mixing the gas-liquid mixture produced by the pump to produce a gas-liquid mixture having ultra-fine bubbles. The stationary mixer according to claim 1, wherein the stationary mixer includes an upstream screw portion and a downstream cutter portion, wherein the screw portion is a cylindrical main body, a partition rod disposed at the center of the main body, and a ring shape between the main body and the partition rod. And a spiral blade disposed inside the flow path, wherein the cutter portion has a cylindrical main body and a plurality of protrusions protruding toward the center on an inner circumferential surface of the main body. 3. The ultra-fine bubble generator according to claim 2, wherein the projection has a head portion which is provided at the protruding tip portion of the shaft portion and the shaft portion and forms a mushroom-like hemispherical shape. The stationary mixer has a discharge nozzle capable of adjusting a pressure inside the outlet pipe at a downstream end of the outlet pipe, and the discharge nozzle and the liquid pipe are connected to a bathtub. Ultra-fine bubble generator, characterized in that.