JP2007000775A - Fine bubble forming device and bathtub system using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superior fine bubble forming device capable forming a large amount of fine bubbles without using a large and expensive circulation pump, and improving quality of circulating liquid, and a bathtub system using it. <P>SOLUTION: This fine bubble forming device is provided with a hot water suction pipe 4 laid from a hot water suction port 2 of a bathtub 1 to the suction side of a circulation pump 3, and hot water circulation pipes 7, 7' laid from a discharge side of the circulation pump 3 to a hot water return port 6 of the bathtub 1. A first air supply pipe 11 is communicated with the suction side of a circulation pump 3, a second air supply pipe 14 is communicated with the middle of hot water circulation pipe 7, and two inner cylinders 17, 18 of special structure are provided inside the hot water circulation pipe 7. A column 20 packed with ore 19 is provided at the downstream side of the communication part of the second air supply pipe 14 in the middle of hot water circulation pipe 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fine bubble generator capable of generating fine bubbles in a storage tank by circulating a liquid inside and outside the storage tank and mixing air in the liquid passage to form a gas-liquid mixed state. It is related with the bathtub system using it.

  2. Description of the Related Art Conventionally, a fine bubble generator is attached to a bathtub to generate fine bubbles while circulating hot water in the bathtub. For example, as shown in FIG. 4, the fine bubble generating device includes a hot water suction pipe 4 extending from the hot water suction port 2 provided in the bathtub 1 to the suction side of the circulation pump 3, and the hot water suction pipe 4. A venturi mechanism 5 for introducing air and a hot water reflux pipe 7 extending from the discharge side of the circulation pump 3 to the reflux port 6 of the bathtub 1 are provided to circulate the hot water in the bathtub. And since the venturi mechanism 5 mixes air with hot water and recirculates it in the bathtub 1 in a state where a part of the air is dissolved, a large number of fine bubbles 8 are generated in the bathtub 1. .

  Since the fine bubbles 8 have an action of adhering floating substances such as dirt floating on the hot water, the hot water can be kept clean for a long time by removing it from the overflow pipe 9 provided in the bathtub 1. it can. In addition, since fine vibrations and ultrasonic waves are generated when the microbubbles 8 are ruptured, there is an effect of giving a pleasant stimulus to a person who is immersed in hot water.

  In such a microbubble generator, if a large number of microbubbles 8 are to be generated, a large amount of air must be mixed in the hot water. In this case, the apparatus shown in FIG. In order to cause problems such as cavitation and air lock, large and expensive ones must be used. However, when such a large and expensive circulation pump is used, there is a problem that not only the cost problem but also the entire fine bubble generating device becomes large and the installation space is limited.

Therefore, in order to reduce the load on the circulation pump 3, an apparatus having a gas-liquid mixing tank provided on the downstream side of the circulation pump 3 has been proposed (see Patent Document 1).
JP 2001-179241 A

  However, even with the above apparatus, the above-mentioned problem has not been sufficiently solved, and development of a more excellent apparatus is desired.

  The present invention has been made in view of such circumstances, and can generate a large amount of fine bubbles without using a large and expensive circulation pump, and can improve the quality of the liquid to be refluxed. An object of the present invention is to provide an excellent fine bubble generator and a bathtub system using the same.

  In order to achieve the above object, the present invention takes out the liquid in the storage tank out of the storage tank, supplies air to this liquid, puts it in a gas-liquid mixed state, and returns it to the storage tank. A fine bubble generating device to be generated, comprising: a liquid suction pipe extending from the liquid suction port of the storage tank to the circulation pump suction side; and a liquid reflux pipe extending from the circulation pump discharge side to the liquid return port of the storage tank, A first air supply pipe communicates with the circulation pump suction side, a second air supply pipe communicates with the liquid reflux pipe, and a root portion of the second air supply pipe is connected to the inside of the liquid reflux pipe. A tapered first inner cylinder is provided, which is attached upstream from the supply pipe communication port and whose tip is positioned at a position facing the second air supply pipe communication port. The base side is the second air A tapered second inner cylinder attached to the downstream side of the supply pipe communication port is provided, and further, downstream of the second air supply pipe communication part in the middle of the liquid reflux pipe. A first aspect of the present invention is a fine bubble generating device provided with a liquid quality improving means for improving the liquid quality of a liquid by bringing the refluxing liquid into contact with the ore.

  In addition, the present invention includes, in particular, an air regulator provided in the middle of each of the first air supply pipe and the second air supply pipe, and a liquid quality in the middle of the liquid reflux pipe. A fine bubble generator provided with a check valve downstream from the improvement means is a second gist, and the liquid quality improvement means is set so that liquid flows in from one end side and liquid flows out from the other end side. A third aspect of the present invention is a fine bubble generator in which the column is filled with granulated quartz andesite glassy porphyry.

  And this invention is provided with the liquid suction inlet and the liquid recirculation | reflux opening in a bathtub, The microbubble which is the summary of any one of the said 1st-3rd using the said liquid suction | inhalation opening and a liquid recirculation | reflux opening A fourth gist is a bathtub system in which a generator is attached, hot water stored in the bathtub circulates through the fine bubble generator, and the hot water refluxed in the bathtub generates fine bubbles. And

  That is, in the fine bubble generating device of the present invention, air is supplied at two points in the liquid circulation path, and the air supply unit on the downstream side of the circulation pump combines two special inner cylinders. Since the air can be mixed with the liquid at a high rate by the ejector effect, the capacity of the circulation pump can be reduced, and the apparatus can be made compact, light, and low in cost.

  Then, air is mixed at a high ratio with respect to the liquid, the solubility in the liquid is high, and the gas-liquid mixing effect by the two special inner cylinders combined with the fine bubbles brought about by the liquid refluxed in the storage tank However, the fine bubbles (for example, 2 to 6 μm) are very fine and abundant. Moreover, since the gas-liquid mixed flow refluxed into the storage tank passes through the liquid quality improvement means, it not only contains fine bubbles but also refluxes in a state where the quality of the liquid itself has been improved. There is an effect that the liquid is not soiled over time and a good state is maintained over a long period of time.

  In particular, an air conditioner is provided in the middle of each of the first air supply pipe and the second air supply pipe, and a check valve is provided in the middle of the liquid recirculation pipe downstream of the liquid quality improvement means. It is easy to set the pressure in the pipe upstream of the liquid quality improvement means and the pressure in the downstream pipe to a predetermined pressure difference by the above two air regulators and the check valve. As a result, the gas-liquid mixed flow can be returned more smoothly to the storage tank.

  Further, in particular, as the liquid quality improving means, a column set so that the liquid flows in from one end side and the liquid flows out from the other end side, which is filled with granule of quartz andesite glassy porphyry was used. In addition to the above-mentioned quartz andesite glassy porphyry and the collision energy when the gas-liquid mixed flow collides, the air solubility is further enhanced, and the rich mineral components contained in quartz andesite glassy porphyry Since (especially silicic acid) elutes, the liquid refluxed in the storage tank is of excellent quality.

  Further, the bath is provided with a liquid suction port and a liquid reflux port, and by using the liquid suction port and the liquid reflux port, the microbubble generator is attached, so that the hot water stored in the bathtub is According to the bathtub system that circulates through the fine bubble generator and generates fine bubbles in the hot water refluxed in the bathtub, the fine bubbles are abundant and a comfortable bathing feeling can be obtained. Moreover, even if hot water is repeatedly circulated, no odor or dirt is generated in the hot water, and the hot water can be kept clean.

  Next, the best mode for carrying out the present invention will be described.

  FIG. 1 shows an embodiment in which the fine bubble generator of the present invention is used for generating fine bubbles while circulating hot water in a bathtub. In the figure, 1 is a bathtub, and a hot water inlet 2 is provided at one location on the side wall, and a hot water reflux port 6 is provided at another location. A hot water suction pipe 4 extends from the hot water suction port 2 and is connected to the suction side of the circulation pump 3. A hot water recirculation pipe 7 extends from the discharge side of the circulation pump 3 and is connected to the hot water recirculation port 6 of the bathtub 1. A first air supply pipe 11 is connected to the suction side of the circulation pump 3 via an air regulator 10 so that hot water and air sucked into the circulation pump 3 are mixed in the circulation pump 3. It has come to be. 12 is a drain pipe for draining water.

  Further, a second air supply pipe 14 is also connected to the hot water reflux pipe 7 via an air regulator 13, and a special gas-liquid mixing mechanism 15 is provided at this connection portion. Reference numeral 16 denotes a drain pipe for draining water.

  The gas-liquid mixed flow mechanism 15 will be described in more detail. As shown in FIG. 2, this portion is composed of two tapered inner cylinders 17 and 18 provided in the hot water reflux pipe 7. Has been. Among these, the first inner cylinder 17 provided on the upstream side has a root portion attached to the upstream side of the communication port 14a of the second air supply pipe 14, and the tip of the tip is narrowed. The part enters a position facing the communication port 14a. As a result, hot water introduced into the hot water recirculation pipe 7 in a predetermined pressure state by the circulation pump 3 is jetted vigorously from the tip of the constriction, and air introduced from the communication port 14a by the ejector effect. Is sucked following the momentum and becomes a gas-liquid mixed flow.

  The second inner cylinder 18 provided on the downstream side of the first inner cylinder 17 has a root portion attached to the downstream side of the communication port 14a, and the gas-liquid mixed flow is further away from the tip. It is jetted vigorously from the tip of the constriction, and the gas becomes fine bubbles, and part of it becomes a gas-liquid mixed flow dissolved in hot water.

  Further, on the downstream side of the portion where the gas-liquid mixing mechanism 15 is provided in the hot water reflux pipe 7 (returning to FIG. 1), as a means for improving the quality of the hot water in the reflux, an ore 19 is provided on the inner side. The gas-liquid mixed flow is introduced from above the column 20, flows down through the gap between the ores 19, and is taken out from below the column 20. Reference numeral 21 denotes an air vent adjuster.

  The gas-liquid mixed flow receives collision energy generated when it flows down while colliding with the ore 19 in the column 20, and more air is dissolved in hot water while fine bubbles are generated or bubbles are bounced. And when an ore contains the component which has a good influence on a body, such as a mineral component, the component elutes and the hot water quality is improved more. Moreover, dirt such as dirt contained in the hot water is removed between the ores 19.

  And the gas-liquid mixed flow taken out from the lower part of the column 20 is discharged into the bathtub 1 from the discharge nozzle 30 attached to the hot water reflux port 6 of the bathtub 1 via the hot water reflux pipe 7 '. Not only bubbles that already exist as fine bubbles but also dissolved air appears as fine bubbles. By the way, hot water in the bathtub 1 is generated by fine bubbles (bubbles having an average particle diameter of 2 to 6 μm) generated from a gas-liquid mixed flow (air supply of 1.9 liters per minute) circulating at a rate of 2.4 liters per minute. The whole (300 liters) becomes a milky white bubble bath in 15 minutes.

  The hot water recirculation pipe 7 ′ is provided with a check valve 31 and a pressure gauge 32, and is in phase with the air regulators 10 and 13 provided in the first and second air supply pipes 11 and 14. In other words, the pressure in the hot water reflux pipes 7 and 7 'is adjusted to a pressure that is optimal for generating fine bubbles and that allows smooth reflux. Incidentally, as an optimal example of the pressure balance, the pressure in the hot water reflux pipe 7 is set to 0.253 MPa (2.5 atm), and the pressure in the hot water reflux pipe 7 ′ is set to 0.203 MPa (2.0 atm). An example can be given.

  In addition, the discharge nozzle 30 attached to the hot water reflux port 6 is provided with two filters 33 that maintain a constant interval in the cavity inside, as shown in FIG. Fine air bubbles can be discharged. This filter 33 has a structure in which the front and back surfaces of a polyester nonwoven fabric 34 having a predetermined thickness are sandwiched between SUS316 nets 35 as shown in FIG.

  The nozzle port 36 of the discharge nozzle 30 has a configuration in which two (or four) small holes having a diameter of 2 mm are formed.

  The bathtub system using the fine bubble generator having the above-described configuration has an advantage that the fine bubble generator is compact and can be provided at a low cost without taking up space. And since the gas-liquid mixed flow recirculated in the bathtub 1 contains a lot of air and the bubbles are very fine and abundant, a comfortable bathing feeling can be obtained. Moreover, even if hot water is circulated repeatedly, the quality of the hot water is improved each time, so that the hot water can be kept clean.

  In the above example, of the two inner cylinders 17 and 18 in the gas-liquid mixing mechanism 15, the arrangement of the upstream first inner cylinder 17 is the opening diameter of the communication port 14 a of the second air supply pipe 14. When L is 100, it is preferable that the length M into which the tip of the constriction enters below the communication port 14a is 70 to 80 (see FIG. 2). That is, if the M is less than 70, the inner cylinder 17 is too shallow and hot water easily escapes upward from the communication port 14a. Conversely, if it exceeds 80, the inner cylinder 17 is too deep and the ejector effect is weak. This is because there is a risk of becoming. Especially, it is optimal to set to 75, and in that case, air can be mixed at a high ratio of 8 air to hot water 10 by volume ratio.

  And the balance of the caliber of the front-end | tip part of the said two inner cylinders 17 and 18 is also important when generating a fine bubble. Although these dimensions depend on the inner diameter of the hot water reflux pipe 7, for example, when the inner diameter of the hot water reflux pipe 7 is 10 mm, the diameter of the tip portion of the first inner cylinder 17 is set to 5 mm, It is preferable to set the diameter of the tip of the tube 18 to 3 mm. That is, by providing a difference in size between both the diameters, the pressure of the gas-liquid mixed flow discharged from the second inner cylinder 18 is increased, the mixing ratio of hot water and air is increased, and fine bubbles are generated abundantly. It can be done.

  Moreover, in the above example, any ore may be used as the ore 19 filled in the column 20, but the average particle size is particularly preferably 8 to 12 mm.

  The ore 19 may be an unprocessed ore, a fired product thereof, or an artificially produced inorganic material or the like.

Among the ores, those containing a large amount of silicic acid (SiO ₂ ) and being easily eluted in water are particularly suitable for improving the quality of the hot water. Especially, what contains 50% or more of silicic acid increases the amount of silicic acid eluted into water, and is preferable in terms of effects. Examples of such ores include quartz andesite glassy porphyry, rhyolite, feldspar, and the like. In particular, quartz andesite glassy porphyry is optimal because it is rich in other mineral components.

  The quartz andesite glassy porphyry belongs to quartz andesite in terms of mineralogy, and contains a lot of natural vitreous material obtained by rapid cooling of magma (sediment), especially the ice age of about 50 million years ago. In addition, submarine volcanic eruption lava rapidly cooled and crystallized, remains pure igneous rocks, buried under 1000m underground and not weathered, rich in minerals and high in crystal water content of over 4% ( Pine ore, manufactured by Minesera Fine) is preferred. That is, since a large amount of unweathered crystal water is contained, many mineral components such as silicic acid can be eluted in water at a high concentration, and a very excellent effect can be obtained.

  The composition examples of the quartz andesite glassy porphyry are as shown in Table 1 below.

  In addition, the said quartz andesite glassy porphyry can have a further excellent effect, when it mixes and uses the thing which baked in the predetermined | prescribed temperature range, and an unfired thing. That is, the various functions of the quartz andesite glassy porphyry are also provided in the unfired product, but by combining with the fired product obtained by firing under different firing conditions, the quartz andesite glassy porphyry is superior. This is because all or some of the various functions can be selectively enhanced.

  When firing the quartz andesite glassy porphyry, the firing method may be a conventionally known method, but the firing temperature is preferably set to 300 to 1500 ° C. That is, when the firing temperature is less than 300 ° C., there is no substantial difference from that of the unfired one. Conversely, when the firing temperature exceeds 1500 ° C., the function of the fired product is not further enhanced, and the function may be deteriorated in some cases. Because there is.

  In addition, it is known that various functions of the obtained baked product differ slightly depending on the calcination temperature and the energy source for calcination (petroleum, gas, electricity, heavy oil, coal, coke, sunlight, firewood). The firing temperature is more preferably set to 350 to 1350 ° C. The firing time is preferably set to 15 to 180 minutes, and soot is optimum as the energy source.

  In the above example, two filters 33 are attached to the inside of the discharge nozzle 30 with a certain distance between them, but a urethane sponge may be sandwiched between the two filters 33. it can. This is preferable because the filter 33 can be stably held. Of course, the configuration of the discharge nozzle 30 is not limited to these. The same effect can be obtained even if the filter 33 or the like is directly attached to the hot water recirculation port 6 without providing the discharge nozzle 30.

  And although said example utilizes the fine bubble generator of this invention for a bathtub system, the fine bubble generator of this invention is not limited to a bathtub system, leisure facilities in a pool, a hot spring, a jacuzzi, It can be widely applied to health facilities. Moreover, it can utilize for the water circulation system in the water tank used for breeding and cultivation of animals and plants, a washing tank, etc.

  Next, examples of the present invention will be described together with comparative examples.

[Example 1]
A bathtub 1 (with an internal volume of 450 liters) provided with a hot water suction port 2 and a hot water reflux port 6 was prepared, and a fine bubble generator having the configuration shown in FIG. 1 was attached. In addition, the column 20 was filled with quartz andesite glassy porphyry (pine ore, manufactured by Minesera Fine Co., Ltd., average particle size 10 mm) as the ore 19. Then, 300 liters of hot water was stored in the bathtub, the fine bubble generator was activated, and hot water circulation was started (circulation rate of hot water 2.4 liters / minute, air supply rate 1.9 liters / minute). Then, the bathing for 20 minutes was repeated three times for one pair of three persons, and at the end of each bathing, the odor and quality of hot water were sensory evaluated, and the amount of dissolved silicic acid, the amount of dissolved ammonia, and the amount of dissolved oxygen were measured. .

[Example 2]
Rhyolite was used as the ore 19. Other than that, bathing was performed in the same manner as in Example 1, and the same evaluation and measurement were performed.

[Comparative Example 1]
In the conventional apparatus shown in FIG. 4, a column in which a column 20 filled with ore 19 similar to that in Example 2 was incorporated in the hot water reflux pipe 7 was used. Other than that, bathing was conducted in the same manner as in Example 2, and the same evaluation and measurement were performed.

[Comparative Example 2]
A conventional apparatus shown in FIG. 4 was used. Other than that, bathing was conducted in the same manner as in Example 2, and the same evaluation and measurement were performed.

  The results of evaluation and measurement of Examples 1 and 2 and Comparative Examples 1 and 2 are summarized in Tables 2 and 3 below.

  From the above results, Examples 1 and 2 can maintain a better odor and hot water quality than Comparative Examples 1 and 2 and have a large amount of dissolved oxygen. can do. In particular, those using quartz andesite glassy porphyry as ore 19 are rich in minerals such as silicic acid and oxygen, have excellent ammonia removal performance, and can realize more comfortable bathing.

It is explanatory drawing which shows one Example of this invention. It is explanatory drawing which shows the principal part of the said Example. (A) is explanatory drawing of the discharge nozzle used for the said Example, (b) is explanatory drawing of the filter used for the said discharge nozzle. It is explanatory drawing which shows an example of the conventional fine bubble generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bathtub 2 Hot water inlet 3 Circulation pump 4 Hot water inlet piping 6 Hot water recirculation port 7, 7 'Hot water recirculation piping 11, 14 Air supply piping 17, 18 Inner cylinder 19 Ore 20 Column

Claims (4)

  A fine bubble generator for generating fine air bubbles in a storage tank by taking out the liquid in the storage tank outside the tank, supplying air to the liquid, returning the liquid into a gas-liquid mixed state, and returning the liquid into the storage tank. A liquid suction pipe from the liquid suction port to the circulation pump suction side, and a liquid reflux pipe from the circulation pump discharge side to the liquid reflux port of the storage tank, and a first air supply pipe on the circulation pump suction side And a second air supply pipe is communicated in the middle of the liquid recirculation pipe, and a root portion is attached to the inner side of the liquid recirculation pipe on the upstream side from the second air supply pipe communication opening. A first tapered inner cylinder is provided at a position where the portion faces the second air supply pipe communication port, and a root side is provided from the second air supply pipe communication port. Attached downstream The second inner cylinder having a tapered shape is provided, and the liquid to be refluxed and the ore are brought into contact with the downstream side of the second air supply pipe communicating portion in the middle of the liquid reflux pipe. And a liquid quality improving means for improving the liquid quality of the liquid.   An air regulator is provided in the middle of each of the first air supply pipe and the second air supply pipe, and a check valve is provided downstream of the liquid quality improvement means in the middle of the liquid reflux pipe. The fine bubble generator according to claim 1.   The liquid quality improving means is a column set so that liquid flows in from one end side and liquid flows out from the other end side, and the column is filled with granite of quartz andesite glassy porphyry The fine bubble generating apparatus according to claim 1 or 2.   A liquid suction port and a liquid reflux port are provided in the bathtub, and the microbubble generator according to any one of claims 1 to 3 is attached using the liquid suction port and the liquid reflux port. A bathtub system characterized in that hot water stored in the bathtub circulates through the fine bubble generating device, and the hot water refluxed in the bathtub generates fine bubbles.

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