JP4094633B2 - Ultra-fine bubble generator - Google Patents

Description

  The present invention relates to an ultrafine bubble generator that generates ultrafine bubbles, and more particularly to an ultrafine bubble generator suitable for application to a cloudy ultrafine bubble bath.

  In general, bubble baths (vibra baths) and pressure baths (jet baths / ultrasonic baths) are used for warm bath facilities such as super public baths and Kurhaus, which release air into the bath. It is called a bubble bath because it takes a bath. The bubble bath is classified according to the size of the bubble. The bubble diameter of the bubble bath is about 2 to 10 mm, and the bubble diameter of the pressure bath is 0.2 to 2 mm.

  By the way, bubbles move innumerably in a warm bath, and in the process, bubbles are ruptured, bonded and separated repeatedly, and sound waves are oscillated. The frequency of the oscillated sound wave is lower as the bubble diameter is larger, and conversely as the bubble diameter is smaller, the frequency is higher.

  Sound waves oscillated by bubbles in the bath will have emulsification, washing, and thermal effects on the human body during bathing, but this effect is affected by the frequency of the oscillating sound waves, and becomes stronger as the frequency increases. . For this reason, development of the bubble generator which can generate the bubble of the smallest possible diameter is calculated | required.

  FIG. 7 shows a conventional bubble generating device developed for such a purpose, and this device comprises an ultrahigh pressure pump 1, an air compressor 2, a pressure tank 3 having an air vent valve 4, and a pressure reducing valve 5. The water in the bathtub 7 sucked from the suction port 6 by the start of the super high pressure pump 1 is supplied into the pressure tank 3 together with the high pressure air from the air compressor 2. In the pressure tank 3, air is a gas-liquid mixture in which water is supersaturated and dissolved, and the gas-liquid mixture is discharged into the bathtub 7 through the pressure reducing valve 5 and the discharge port 8. And the air which was melt | dissolving by supersaturation is discharge | released to the bathtub 7 as a fine bubble by the release under a normal pressure.

  The conventional bubble generating device requires large-scale equipment that requires careful handling, such as an ultra-high pressure pump 1, an air compressor 2, and a pressure tank 3, so that it requires skill in operation and ensures safety. Equipment is also required, and the generated bubbles have a diameter of about 3 μm, and there is a problem that bubbles smaller than that cannot be generated.

  The present invention has been made in view of the present situation, and an object thereof is to provide an ultrafine bubble generating device that is easy to handle, highly safe, and that can continuously generate small bubbles of about 3 μm or less. To do.

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

  Another object of the present invention is to provide an ultrafine bubble generator capable of generating ultrafine bubbles stably at a low pressure with a simple structure and few failures.

  Another object of the present invention is to provide an ultrafine bubble generator that can further stabilize the generation of ultrafine bubbles.

  In order to achieve the above object, the present invention introduces gas from the gas introduction part by utilizing a liquid pipe having a gas introduction part in the vicinity of the downstream end and a negative pressure at the time of driving attached to the downstream end of the liquid pipe. A pump that generates a liquid mixture, and a static mixer that generates a gas-liquid mixture having ultrafine bubbles by stirring and mixing the gas-liquid mixture that is disposed on the outlet side of the pump and generated by the pump; The stationary mixer includes an upstream screw portion and a downstream cutter portion, and the screw portion includes a cylindrical main body, a partition bar disposed in a central portion of the main body, a main body, and a partition bar. The cutter unit has a cylindrical main body and a plurality of protrusions projecting toward the center on the inner peripheral surface of the main body. It is characterized by. A gas-liquid mixture is generated by the pump, and the gas-liquid mixture from the pump is given a swirl force and a centrifugal force while passing through the screw portion, and becomes an accelerated swirl flow. Sent to the department. In this swirling flow, the bubbles are divided and refined every time they collide with each protrusion, and it becomes possible to stably generate ultrafine bubbles of about 3 μm or less at low pressure. Moreover, since the apparatus has a simple structure mainly composed of a pump and a static mixer, there are few failures and maintenance is easy.

  The present invention is also characterized in that the projection is constituted by a shaft portion and a head portion that is provided at a protruding tip portion of the shaft portion and has a generally bowl-shaped hemispherical shape. By the way, the swirling flow from the screw part is a multi-layered swirling flow in which the outer diameter side contains a gas-liquid mixture with few bubbles and the center side becomes a gas-liquid mixture with a large amount of contained bubbles. For this reason, by having the head at the projecting tip of the shaft portion, the bubbles are more effectively divided and refined, and the generation of ultrafine bubbles can be further stabilized.

  The present invention is further characterized in that the discharge nozzle has an operation handle for adjusting the opening degree of the discharge nozzle. Then, by adjusting the opening of the discharge nozzle with the operation handle, the pressure in the outlet pipe is adjusted, and the ultrafine gas-liquid mixture is placed in a compressed state in the outlet pipe under high pressure. It is possible to stably generate ultrafine bubbles in the bathtub from the ultrafine gas-liquid mixture discharged from the tank.

  As described above, according to the present invention, the liquid pipe having the gas introduction portion in the vicinity of the downstream end, and the negative pressure at the time of driving attached to the downstream end of the liquid pipe are used to introduce gas from the gas introduction portion. A pump that generates a liquid mixture, and a stationary mixer that is arranged on the outlet side of the pump and generates a gas-liquid mixture having ultrafine bubbles by stirring and mixing the gas-liquid mixture generated by the pump, The stationary mixer includes an upstream screw portion and a downstream cutter portion, and the screw portion includes a cylindrical main body, a partition bar disposed in a central portion of the main body, a main body, and a partition bar. The cutter unit has a cylindrical main body and a plurality of protrusions projecting toward the center on the inner peripheral surface of the main body. It is characterized by. Then, a gas-liquid mixture is generated by the pump, and the gas-liquid mixture from the pump is given a swirl force and a centrifugal force while passing through the screw portion, and becomes an accelerated swirl flow. Sent to the department. In this swirling flow, the bubbles are divided and refined every time they collide with each protrusion, and it becomes possible to stably generate ultrafine bubbles of about 3 μm or less at low pressure. Moreover, since the apparatus has a simple structure mainly composed of a pump and a static mixer, there are few failures and maintenance is easy.

  In the present invention, the pump is constituted by a spiral pump having a vortex-shaped casing and an impeller rotating in the casing, so that the gas in the gas-liquid mixture is rotated by the impeller blades rotating. A gas-liquid mixture which is cut and subdivided and has subdivided bubbles of about 0.1 to 0.5 mm can be obtained continuously and stably. For this reason, the size of the bubbles obtained by the static mixer can be further reduced.

  In the present invention, since the protrusion is constituted by the shaft portion and the head portion that is provided at the protruding tip portion of the shaft portion and has a substantially bowl-shaped hemisphere, the bubbles in the gas-liquid mixture are more effective. Therefore, it is possible to stably generate ultrafine bubbles of about 0.5 to 3 μm.

  The present invention is further characterized in that the discharge nozzle has an operation handle for adjusting the opening degree of the discharge nozzle. Then, by adjusting the opening of the discharge nozzle with the operation handle, the pressure in the outlet pipe is adjusted, and the ultrafine gas-liquid mixture is placed in a compressed state in the outlet pipe under high pressure. It is possible to stably generate ultrafine bubbles in the bathtub from the ultrafine gas-liquid mixture discharged from the tank.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an ultrafine bubble generator according to an embodiment of the present invention. This ultrafine bubble generator 11 includes a pump 12 that generates a gas-liquid mixture, and a bubble mixture from the pump 12. And a stationary mixer 13 for generating a gas-liquid mixture that generates ultrafine bubbles by stirring and mixing, and a liquid pipe 15 having an air inlet 14 near the downstream end on the inlet side of the pump 12. The bath water 17 in the bathtub 16 is supplied from the suction port 18, and the gas-liquid mixture generated by the static mixer 13 is compressed in the outlet pipe 20. Then, it is sent to the discharge nozzle 19 at the downstream end and discharged from the discharge nozzle 19 to generate ultrafine bubbles in the bathtub 16.

  For example, as shown in FIG. 2, the pump 12 includes a spiral pump 21 including a spiral-shaped casing 21 a and an impeller 21 b that rotates in the casing 21. The spiral pump 21 includes an impeller 21 b. The air 22 is sucked from the air inlet 14 by the negative pressure accompanying the rotation of the air, and a gas-liquid mixture 23 of the bath water 17 and the air 22 is generated.

  That is, the base end of the air introduction port 14 is inserted to the substantially center position of the liquid pipe 15, and the air 22 is almost at the center position of the liquid pipe 15 due to the negative pressure accompanying the start of the spiral pump 21. It is designed to be sucked and discharged from the outside. The gas-liquid mixture 23 generated by the spiral pump 21 is sent to the stationary mixer 13 via the communication pipe 24.

  As shown in FIG. 3, the static mixer 13 includes an upstream screw portion 25 and a downstream cutter portion 26, and the gas-liquid mixture 23 from the spiral pump 21 is formed by the screw portion 25. A turning force and a centrifugal force are applied, and bubbles in the gas-liquid mixture 23 are divided and refined by the cutter unit 26. Finally, small bubbles having a diameter of about 0.5 to 3 μm are formed. As the contained ultrafine gas-liquid mixture 27, it is delivered to the outlet side pipe 20.

  As shown in FIG. 3, the screw portion 25 is arranged in a cylindrical main body 28, a partition bar 29 disposed in the center of the main body 28, and an annular flow path between the main body 28 and the partition bar 29. The gas-liquid mixture 23 that is configured by the spiral blade 30 and flows in the annular flow path is subjected to rotational force and strong twist by the spiral blade 30 and is sent to the cutter unit 26 as an accelerated swirl flow. .

  As shown in FIGS. 3 and 4, the cutter part 26 projects from the main body 31 having the same diameter as the main body 28 of the screw part 25 and the inner peripheral surface of the main body 31 toward the center. Each projection 32 includes a shaft portion 32a that protrudes from the inner peripheral surface of the main body 31, and a head portion 32b that is provided at the protruding tip of the shaft portion 32a and forms a generally bowl-shaped hemisphere. It consists of and. And by providing the head part 32b in the protrusion front-end | tip part of the axial part 32a, a large amount of ultrafine gas-liquid mixture can be produced | generated using cavitation so that it may mention later.

  On the other hand, as shown in FIG. 5, the discharge nozzle 19 includes a case 33 that is attached to the bottom of the bathtub 16 and opens to the bathtub 16 side. A valve seat 34 connected to the downstream end of the outlet side pipe 20 is fixed in the case 33, and a valve body 35 is axially attached to the valve seat 34 as shown in FIGS. 5 and 6. Move and sit down. That is, a support member 36 is attached to the valve seat 34, and a male screw portion 37 a formed on the operation rod 37 is screwed to a female screw portion 36 a formed on the support member 36. The valve body 35 is rotatably attached, and an operation handle 38 is fixed to the other end of the operation rod 37. The gap between the valve seat 34 and the valve body 35 is adjusted by holding the operating hand 38 and rotating the operating rod 37 forward and backward, and the opening degree of the discharge nozzle 19 can be controlled. .

Next, the operation of the present embodiment will be described.
When the spiral pump 21 is started, the impeller 21b rotates in the casing 21a, and the inlet side of the spiral pump 21 becomes negative pressure. For this reason, the bathtub water 17 in the bathtub 16 is supplied to the spiral pump 21 through the liquid pipe 15, and at the same time, the air 22 is sucked in through the air inlet 14, and the spiral pump 21 together with the bathtub water 17. To be supplied. And in the spiral pump 21, the bathtub water 17 and the air 22 are stirred and mixed, and the gas-liquid mixture 23 is produced | generated.

  By the way, since the spiral pump 21 has a structure in which the impeller 21b rotates in the casing 21a, the air 22 in the gas-liquid mixture 23 is cut and subdivided by the impeller 21b. For this reason, unlike the pump of another structure, the gas-liquid mixture 23 which has about 0.1-0.5 mm fine bubble can be obtained.

  The gas-liquid mixture 23 generated in this way is sent to the static mixer 13 via the connecting pipe 24 and further stirred and mixed by the static mixer 13. Thereby, an ultrafine gas-liquid mixture 27 having ultrafine bubbles of about 0.5 to 3 μm is generated.

  That is, the gas-liquid mixture 23 from the communication tube 24 is first guided to the screw portion 25. Since the screw portion has a structure in which the spiral blade 30 is disposed in the annular flow path between the main body 28 and the partition rod 29, the gas-liquid mixture 23 passes through the annular flow path while the gas-liquid mixture 23 passes through the annular flow path. The mixture 23 is given a rotational force and a strong twist, and becomes an accelerated swirl flow. In addition, the swirl flow is a gas-liquid mixture 23 (gas-liquid mixture 23 containing little air 22) on the outer diameter side and a gas-liquid mixture 23 (air 22 on the inner meridian side) light due to the centrifugal force. Is a so-called multilayered swirl flow that becomes a gas-liquid mixture 23) containing a large amount of.

  For this reason, as shown in FIGS. 3 and 4, the gas-liquid mixture 23 in the cutter unit 26 has a low-end portion 39 containing a large amount of air 22 in the axial center portion, and the outer periphery of the gas-liquid mixture 23 is the bathtub water 17. The fluid 40 in which the air 22 and the air 22 are mixed moderately and the fluid 41 that hardly contains the air 22 are swirled at a high pressure to form a so-called concentric multilayered swirl flow. As a result, a large amount of turbulent vortices are generated between the inside and outside of the running water.

  By the way, since the protrusion 32 protrudes from the inner peripheral part of the main body 31 of the cutter part 26, the running water 41 that hardly contains the air 22 collides with the shaft part 32a of the protrusion 32, and the air 22 is a fine bubble. Turn into.

  On the other hand, the fluid 40 in which the bathtub water 17 and the air 22 are mixed moderately collides with the heads 32b of the protrusions 32 to form scattered fine particles, and cavitation occurs to generate a large amount of fine bubbles.

  Also, the bubbles in the multi-layered swirling flow flowing in the cutter unit 26 are fine particles having a high density due to the centrifugal force toward the outer meridian side of the main body 31 and the centripetal force toward the axial side of the main body 31. The fine particles having a low density are directed toward the axial center of the main body 31. For this reason, these fine particles repeatedly collide violently, and at the downstream end of the cutter unit 26, an ultrafine bubble mixture 27 having ultrafine bubbles of about 0.5 to 3 μm is formed. The stirring and mixing time in the static mixer 13 is set to about 0.04 to 0.4 seconds.

The ultrafine bubble mixture 27 generated in this way is discharged to the outlet side pipe 20 and placed in a compressed state in the outlet side pipe 20. The ultrafine bubble mixture 27 placed in a compressed state in the outlet side pipe is further discharged into the bathtub 16 from the discharge nozzle 19 and violently collides with the bathtub water 17, thereby forming the ultrafine bubble mixture. The fine bubbles of about 0.1 to 0.5 μm contained in 27 are completely pulverized, and ultrafine bubbles of about 0.5 to 3 μm are uniformly generated in the bath water 17. Due to the generation of the ultrafine bubbles, the inside of the bathtub 16 becomes clouded in about 2 to 3 minutes after discharging.

  By the way, when the stationary mixer 13 and the bathtub 16 are separated from each other and the outlet side pipe 20 becomes long, if the pressure in the outlet side pipe 20 is atmospheric pressure, ultrafine gas-liquid mixing is performed in the outlet side pipe 20. The fine bubbles in the body 27 may be combined with each other and become large bubbles.

However, in the present embodiment, since the discharge nozzle 19 whose opening degree can be adjusted is provided at the downstream end of the outlet side pipe 20, the pressure in the outlet side pipe 20 is a pressure of about 2.5 kg / cm ^2. Adjusted to For this reason, the refined bubbles in the ultrafine gas-liquid mixture 27 are not bonded to each other in the outlet side pipe 20 and can be discharged into the bathtub 16 as the ultrafine bubbles.

As described above, according to the present embodiment, the superfine gas-liquid mixture 27 is generated by combining the spiral pump 21 and the static mixer 13 and stirring and mixing the gas and liquid. The liquid mixture 27 is compressed in the outlet side pipe 20 and discharged from the discharge nozzle 19 into the bathtub 16 under a high pressure of about 2.5 kg / cm ² to collide with the bathtub water 17. Fine bubbles can be crushed to generate uniform ultrafine bubbles. The apparatus according to the present embodiment is simple in configuration and does not require high pressure, so that the safety is high.

  In addition, in the said one Embodiment, although the case where it applied to the bathtub 16 was demonstrated, it can apply similarly to waste water treatment equipment, mixing devices, such as a carbon dioxide gas, ozone, etc.

1 is an overall configuration diagram showing an ultrafine bubble generating device according to an embodiment of the present invention. Sectional drawing which shows the structure around a pump. Explanatory drawing which shows the structure of a static mixer. Explanatory drawing which shows the mechanism of the ultrafine bubble production | generation in a cutter part. Sectional drawing which shows the structure of a discharge nozzle. The principal part enlarged view of FIG. The block diagram which shows the conventional bubble generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Super fine bubble generator 12 Pump 13 Static mixer 14 Air inlet 15 Liquid piping 16 Bath 17 Bath water 19 Discharge nozzle 20 Outlet piping 21 Spiral pump 21a Casing 21b Impeller 22 Air 23 Gas-liquid mixture 24 Connection pipe 25 Screw part 26 Cutter part 27 Ultra-fine gas-liquid mixture 28, 31 Main body 29 Divider rod 30 Spiral blade 32 Protrusion 32a Shaft part 32b Head 33 Case 34 Valve seat 35 Valve element 36 Support member 37 Operation rod 38 Operation handle

Claims (3)

  A liquid pipe having a gas introduction part in the vicinity of the downstream end; a pump attached to the downstream end of the liquid pipe for introducing a gas from the gas introduction part using a negative pressure during driving; and a pump A stationary mixer that is disposed on the outlet side of the gas generator and agitates and mixes the gas-liquid mixture generated by the pump to generate a gas-liquid mixture having ultrafine bubbles, and an outlet connected to the outlet side of the stationary mixer. And a discharge nozzle capable of adjusting the opening degree, which is disposed at the downstream end of the outlet pipe and attached to the bathtub, and the stationary mixer includes an upstream screw part, a downstream cutter part, The screw part has a cylindrical main body, a partition bar disposed in the center of the main body, and a spiral blade disposed in an annular flow path between the main body and the partition bar, The cutter unit has a cylindrical main body and a plurality of protrusions projecting toward the center on the inner peripheral surface of the main body. Ultrafine bubble generating apparatus characterized by and a protrusion.   2. The ultrafine bubble generating device according to claim 1, wherein the projection has a shaft portion and a head portion having a substantially bowl-shaped hemisphere provided at a protruding tip portion of the shaft portion.   2. The ultrafine bubble generating device according to claim 1, wherein the discharge nozzle has an operation handle for adjusting an opening degree of the discharge nozzle.

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