JP2013052155A - System for manufacturing artificial microbubble hot spring and method for manufacturing artificial microbubble hot spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system which can manufacture an artificial microbubble hot spring that is excellent in medicinal effect of a hot bath.SOLUTION: The system for manufacturing an artificial microbubble hot spring includes generating microbubbles from a microbubble generating means to dissolve a gas contained in the microbubbles into a hot water, wherein the microbubble generating means is provided with slits, through which a gas-liquid biphasic flow is discharged into the hot water in a shearing manner, thereby generating the microbubbles in the hot water.

Description

  The present invention relates to a system for manufacturing an artificial microbubble spring having an excellent warm bath effect, and a method for manufacturing the artificial microbubble spring.

  When bathing in hot springs containing carbon dioxide (carbonated springs), various warm bath effects such as vasodilation effects and difficulty in cooling water are obtained. In recent years, many systems for artificially obtaining such carbonated springs have been proposed (for example, Patent Documents 1 to 4).

  One of the artificial carbonated spring production systems currently in wide use is a system using a so-called pressure dissolution type bubble generator. In the pressure dissolution type bubble generator, carbon dioxide is dissolved in supersaturated water under high pressure at high pressure, and the resulting supersaturated solution is discharged into a bath under atmospheric pressure to dissolve in supersaturated water. Part of the carbon dioxide gas becomes micronuclei, and microbubbles can be generated.

International Publication No. 03/020405 Pamphlet JP 2008-212276 A JP 2007-14482 A JP 2006-320675 A

  As described above, in a pressure dissolution type system, it is necessary to dissolve gas in warm water in a supersaturated manner. This complicates the system and increases the equipment cost. In addition, excessive gas is also a problem from the viewpoint of cost. On the other hand, in order to simplify the system, it is conceivable to generate bubbles in the warm water by bubbling. However, it is difficult to increase the gas concentration in the warm water, and a desired warm bath effect cannot be obtained.

  In addition, as described above, the warm bath effect of carbonated springs is widely known, but using other gases (eg, air), the desired physiological effectiveness (warm bath effect, improved metabolism, recovery from muscle fatigue, etc.) Equipment costs can be further reduced if the artificial microbubble springs can be produced.

  Then, this invention makes it a subject to provide the system and method which can manufacture the artificial micro bubble spring excellent in a warm bath effect at low cost.

As a result of intensive studies by the present inventors, the following findings were obtained.
(1) When a gas-liquid two-phase flow formed by mixing gas and liquid is ejected from the slit in a shearing manner, the bubbles in the gas-liquid two-phase flow can be sheared, and microbubbles can be easily formed. Can be generated.
(2) The microbubbles generated by the slit shearing method have a zeta potential of −20 mV or less (the average value is −30 mV or less, preferably −40 mV or less), and the pressure dissolution method. The absolute value of the zeta potential is larger than the generated microbubble.
(3) The microbubbles generated in a shearing manner through the slit can be dissolved in hot water at a high concentration.
(4) Since the microbubbles generated in a shearing manner through the slit have a low bubble contraction rate and a low bubble rise rate, they can stay in warm water for a long time.
(5) Microbubbles can be generated by the slit shearing method, and an artificial microbubble spring can be easily manufactured. In this case, not only carbon dioxide but other gases such as air can be used. The artificial microbubble spring has an excellent effect of increasing body temperature during bathing, and is difficult to cool. It is considered that the pressure and temperature rise generated by the bubbles when they are crushed are effectively utilized for the human physiological effect.

The present invention has been made based on the above findings. That is,
1st this invention is a manufacturing system of the artificial microbubble spring which generates a microbubble from a microbubble generation means, and dissolves the gas contained in the said microbubble in warm water, Comprising: In the said microbubble generation means, An artificial microbubble spring manufacturing system is provided with a slit and generates microbubbles in warm water by discharging a gas-liquid two-phase flow into the warm water in a shearing manner through the slit.

  According to a second aspect of the present invention, there is provided a step of generating a microbubble in the hot water by discharging a gas-liquid two-phase flow into the hot water in a shearing manner through the slit, and an interface between the generated microbubble and the hot water. And a step of dissolving the gas contained in the microbubbles in warm water.

  In the present invention, “microbubble” refers to a bubble having a bubble diameter of about 10 to 80 μm, preferably about 40 to 60 μm. “Warm water” refers to water having a temperature suitable for bathing, for example, warm water at around 40 ° C. “Artificial microbubble spring” refers to an artificial hot spring in which microbubbles are dispersed and gas contained in the microbubble is dissolved. “Gas-liquid two-phase flow” is simply a mixture of gas and liquid. In the present invention, bubbles larger than microbubbles exist in the gas-liquid two-phase flow. “Shearing a gas-liquid two-phase flow into warm water through a slit in a shearing manner” refers to the following mode. That is, the slit is provided so as to open in a direction different from the main flow direction of the gas-liquid two-phase flow. As a result, a part of the gas-liquid two-phase flow is bent in a direction different from the main flow direction, divided into a shear type, and discharged from the slit. In the present invention, by using a slit to discharge a gas-liquid two-phase flow in a shearing manner, bubbles contained in the gas-liquid two-phase flow can be separated by a shearing force, and microbubbles are generated. Can do.

  In the present invention, the zeta potential of the generated microbubbles is −20 mV or less. In addition, the average value of the zeta potential is −30 mV or less, preferably −40 mV or less. By having a zeta potential having a large absolute value as described above, the dispersibility of the microbubbles is increased, and the residence time of the microbubbles in the hot water can be increased, or the gas can be dissolved at a high concentration.

  In the present invention, carbon dioxide or air is particularly preferable as the gas. This is because an artificial microbubble spring that provides a desired warm bath effect can be manufactured at a lower cost.

  In the present invention, an artificial microbubble spring is produced by generating microbubbles by a slit shearing method. In the present invention, it is not necessary to dissolve the gas before generating the microbubbles. Further, only a gas-liquid two-phase flow and a slit need be used, and the system is extremely simple. That is, according to the present invention, it is possible to reduce operation costs and facility costs (amount of gas used, power) as compared to conventional systems. Further, the artificial microbubble spring obtained by the present invention has an effect of increasing body temperature at the time of bathing, and it is difficult to cool the hot water after bathing. That is, according to the present invention, it is possible to provide a system and a method capable of producing an artificial microbubble spring having an excellent warm bath effect at a low cost.

It is the schematic which shows an example of the microbubble generation means used for this invention. It is the schematic for demonstrating the manufacturing system of the artificial microbubble spring which concerns on this invention. It is the schematic for demonstrating the structure of the system used in the Example. It is a figure which shows the measurement result which concerns on the bubble diameter distribution of a microbubble. It is a figure which shows the measurement result which concerns on the zeta potential of a microbubble. It is a figure which shows the measurement result concerning the bubble contraction speed in warm water. It is a figure which shows the measurement result which concerns on the melt | dissolution density | concentration change in warm water at the time of using a carbon dioxide gas. It is a figure which shows the measurement result which concerns on the melt | dissolution density | concentration change in warm water at the time of using a carbon dioxide gas. It is a figure which shows the measurement result which concerns on the solubility sustainability of the carbon dioxide gas in warm water. It is a figure which shows an experimental result about the difference of the bioactivity effect by the difference in the manufacturing method of artificial microbubble spring.

<1. Artificial microbubble spring manufacturing system>
(1.1. First Embodiment)
The system for producing an artificial microbubble spring according to the present invention generates microbubbles from the microbubble generating means and dissolves the gas contained in the microbubbles in warm water, and the microbubble generating means is provided with a slit. The microbubbles are generated in the warm water by discharging a gas-liquid two-layer flow into the warm water through a slit in a shearing manner.

(Micro bubble generation means)
The microbubble generating means according to the present invention may be any form as long as it can discharge a part of the gas-liquid two-phase flow in a shearing manner through the slit. For example, microbubble generating means 10 as shown in FIG. 1 is suitable.

  As shown in FIG. 1, the microbubble generating means 10 includes a hot water inlet 10a for introducing hot water, a gas inlet 10b for introducing gas, and downstream of the hot water inlet 10a and the gas inlet 10b. And a cylindrical body 10c connected to the side. A plurality of slits 10s are provided in parallel on the side wall of the cylindrical body 10c, and the slits 10s are provided inclined by a predetermined angle θ. The downstream end of the cylindrical body 10c is closed, and the introduced hot water and gas are discharged from the slits 10s, 10s,.

  In the microbubble generating means 10, the hot water introduced from the hot water inlet 10a flows in the direction indicated by the arrow X and flows into the cylindrical body 10c. Here, a throttle portion 10d is provided between the hot water inlet 10a and the cylindrical body 10c, and a gas inlet 10b is provided so as to communicate with a side portion of the throttle portion 10d. Since the flow rate of the hot water increases in the throttle portion 10d and the vicinity of the gas inlet 10b can be set to a negative pressure, the gas is self-primed from the gas inlet 10b as indicated by the arrow Y, and the throttle portion 10d It becomes a gas-liquid two-phase flow and flows into the cylindrical body 10c.

  In the microbubble generating means 10, the slits 10s, 10s,... Provided in the cylindrical body 10c are opened in a direction Z different from the main flow direction X of the gas-liquid two-phase flow. In FIG. 1, the slits 10s, 10s,... Are inclined by an angle θ with respect to the parallel direction of the slits 10s, 10s,. The inclination angle θ of the slit 10s is not particularly limited as long as the gas-liquid two-phase flow can be discharged in a shearing manner. For example, it is preferably about 30 ° to 90 °, and particularly preferably 50 ° to 70 °. When the inclination angle θ is less than 30 ° or an obtuse angle, it is difficult to generate microbubbles. In addition, it is also possible to set it as a different inclination | tilt angle with one slit and another slit.

  In the microbubble generating unit 10, the number of slits and the interval between the slits are not particularly limited, and can be appropriately selected according to the scale of the microbubble generating unit 10. Further, in order to efficiently generate microbubbles, the area ratio of the inlet / outlet of the microbubble generating means 10 is important. That is, if the ratio of the total area of the slits 10s, 10s,... And the diameter of the cylindrical body 10c is about 1.5 to 2.5, microbubbles can be generated efficiently and appropriately.

  By using such microbubble generating means 10, an artificial microbubble spring can be easily manufactured. FIG. 2 schematically shows an example of a production system for artificial microbubble springs according to the present invention. As shown in FIG. 2, in an artificial microbubble spring manufacturing system 100 (hereinafter, simply referred to as “system 100”), at least slits 10s, 10s,... Is immersed in warm water stored in the bathtub 110. And while introducing warm water from the warm water inlet 10a and introducing gas from the gas inlet 10b by self-supply, a gas-liquid two-phase flow is formed inside, and this is sheared from the slits 10s, 10s,. The microbubbles are generated in the hot water of the bathtub 110 and the gas is dissolved in the hot water.

  In the system 100, the temperature of the hot water introduced into the hot water inlet 10a may be the same temperature as the hot water in the bathtub 110. That is, when hot water is filled in the bathtub 110 in actual use, hot water discharged from the microbubble generator 10 (hot water containing microbubbles) can be used as it is as hot water for bathing. Moreover, it is also possible to circulate the hot water in the bathtub with a pump and to introduce the hot water into the hot water inlet 10a again. In this case, for example, at the time of additional cooking, the hot water in the bathtub 110 can be made into an artificial microbubble spring that is excellent in the warm bath effect again. In the system 100, the flow rate of the hot water introduced into the hot water inlet 10a is not particularly limited.

  The gas used in system 100 is preferably carbon dioxide or air. This is because an artificial microbubble spring having an excellent warm bath effect can be manufactured more easily at a low cost. Further, in the system 100, since it is not necessary to dissolve the gas by supersaturation before generating the microbubbles, the system can be greatly simplified, and the equipment cost can be suppressed.

The microbubbles generated by the system 100 can be dissolved in hot water at a high concentration, and the bubble contraction speed is small, so that the microbubbles can stay in the warm water for a long time. In the obtained artificial microbubble spring, the dissolved gas concentration can be maintained at a high concentration for a long time. As a result, the amount of gas required can be reduced, the cost can be further reduced, and an artificial microbubble spring having an excellent warm bath effect can be obtained. One of the factors is that the zeta potential of the microbubbles generated by the system 100 is completely different from the conventional one. That is, the zeta potential of microbubbles generated by a conventional system, for example, a pressure dissolution type system, is about −10 mV, whereas the zeta potential of microbubbles generated by the system 100 is −20 mV to −70 mV. And a high value.
In the present invention, a desired warm bath effect is obtained by generating microbubbles having a high zeta potential. This means that even a system other than the slit shear type can produce an artificial microbubble spring having a desired warm bath effect as long as it can generate microbubbles with a high zeta potential. Suggests.

  Another feature of the microbubbles generated by the system 100 is that the bubble diameters vary widely. That is, when the bubbles are refined in a shearing manner through the slit, the shearing force applied to a part of the gas-liquid two-phase flow and the shearing force applied to the other part are not constant, and shearing is performed. Microbubbles having various bubble diameters are generated from bubbles that are extremely refined by force to bubbles that are only refined to the extent of the slit opening width. If the bubble diameter is too large, it will easily float in the warm water of the bathtub 110 and may be deaerated into the atmosphere without dissolving in the warm water. However, the microbubbles generated by the system 100 are zeta as described above. Such a problem is reduced because the potential is high and the dispersibility is high, and the liquid can stay in warm water for a long time.

  For example, when producing an artificial carbonated spring by generating carbon dioxide microbubbles, the artificial carbonated spring obtained by the system 100 can dissolve the carbon dioxide gas at a high concentration. According to the system 100, an artificial carbonated spring having a pH of about 4.5, which is a so-called high-concentration carbonated spring, can be easily manufactured using hot water of 40 ° C. And the high concentration carbonated spring obtained by the system 100 can maintain a carbon dioxide dissolved concentration for a long time.

  In addition, as a result of intensive studies by the present inventors, it has been found that even when an artificial microbubble spring using air is manufactured in the system 100, the obtained artificial microbubble spring has an extremely excellent bathing effect. did. Specifically, it was found that it was excellent in the body temperature increasing effect at the time of bathing, and it was difficult to cool the hot water even after bathing.

  Although it is widely known that when bathing in carbonated springs, it is possible to obtain warm bathing effects such as vasodilatory effects and hot water cooling prevention effects, it is not common knowledge that air microbubble springs show excellent warm bathing effects. is there. Although the specific reason for the high temperature of the microbubble spring of the air obtained by the present invention is not known, for example, by dissolving the air in the microbubble, the microbubble gradually contracts, A high pressure field is formed at the moment of disappearance, which stimulates the skin surface, and is thought to have led to an increase in body temperature and an effect to prevent hot water from cooling. As described above, by generating microbubbles in a shearing manner through the slit as in the present invention, as a result of being able to provide an artificial microbubble spring containing microbubbles with a high zeta potential and a long bubble life, Even when air is used, it is considered that such a warm bath effect was obtained. As described in detail in Examples, when bathing in an artificial microbubble spring obtained by the system 100, an excellent warm bath effect is obtained.

  As described above, according to the system 100, an artificial microbubble spring can be manufactured by generating microbubbles by the slit shear method. In the system 100, it is not necessary to dissolve the gas before generating the microbubbles. Further, only a gas-liquid two-phase flow and a slit need be used, and an extremely simple configuration is adopted. That is, the equipment cost can be reduced. Further, the artificial microbubble spring obtained by the system 100 is excellent in the warm bath effect. As described above, according to the system 100, it is possible to manufacture an artificial microbubble spring that provides an excellent warm bath effect at a low cost.

  In the above description, the mode of self-priming gas from the outside using the flow velocity change in the microbubble generating means 10 has been described, but the present invention is not limited to this mode. It is good also as what supplies gas in a microbubble generation means using a high-pressure gas cylinder. However, from the viewpoint of forming a gas-liquid two-phase flow more easily with a simple configuration, a flow rate change is caused inside by providing a constricted portion 10d as in the microbubble generating means 10, and the like. It is preferable that a negative pressure is generated by the above to self-suck gas from the outside.

(1.2. Second Embodiment)
In the above description, the microbubble generating means 10 includes the cylindrical body 10c, and a plurality of slits 10s, 10s,... Are formed in the cylindrical body 10c, but the present invention is limited to this form. It is not a thing. Any other form may be used as long as the gas-liquid two-phase flow can be discharged in a shearing manner.

For example, the characteristic of generating microbubbles by the shearing method is that the zeta potential of the microbubbles is increased as described above. If the system is capable of increasing the zeta potential of the microbubbles. For example, it is considered possible to produce an artificial microbubble spring that provides a desired warm bath effect.
Specifically, an artificial microbubble spring manufacturing system that generates microbubbles from microbubble generating means and dissolves gas contained in the microbubbles in warm water, the microbubbles generated by the microbubble generating means An artificial microbubble spring that has a desired hot-bath effect can be obtained by using an artificial microbubble spring manufacturing system having a bubble zeta potential of -20 mV or less (average value is -30 mV or less, preferably -40 mV or less). Manufacturable.

<2. Manufacturing Method of Artificial Micro Bubble Spring>
(2.1. First embodiment)
The method for producing an artificial microbubble spring according to the present invention includes a step of generating microbubbles in warm water by discharging a gas-liquid two-phase flow into warm water in a shearing manner through a slit, and the generated microbubbles And a step of dissolving the gas contained in the microbubbles in the warm water through the interface between the warm water and the hot water. Since the details of the system that can implement the manufacturing method are as described above, the description thereof is omitted here.

(2.2. Second embodiment)
In addition, as described above, the feature when the microbubbles are generated by the slit shearing method is that the zeta potential of the microbubbles is increased. If the zeta potential of the microbubbles is increased, the slit shearing is performed. Regardless of the method, it is considered possible to produce artificial microbubble springs that can achieve the desired warm bath effect. From this point of view, through the step of generating microbubbles having a zeta potential of −20 mV or less (average value −30 mV or less, preferably −40 mV or less) in warm water, and the interface between the generated microbubbles and warm water, It is considered that an artificial microbubble spring that can provide a desired warm bath effect can also be manufactured by a method for manufacturing an artificial microbubble spring that includes a step of dissolving a gas contained in microbubbles in warm water.

  EXAMPLES Hereinafter, although the manufacturing system of the artificial microbubble spring which concerns on this invention is further explained in full detail according to an Example, this invention is not limited to the specific form described in the following Example.

<1. System configuration used in the experiment>
As a system according to the example, a system 200 as shown in FIG. 3 was used. That is, the microbubble generating means 210 was installed in the bathtub 220 in which warm water was stored. A pump 230 is connected to the hot water inlet of the microbubble generating means 210 so that the hot water in the bathtub 220 can be circulated. On the other hand, a carbon dioxide gas cylinder or an air cylinder 250 was connected to the gas inlet of the microbubble generating means 210 via a flow meter 240. A pH measuring device 260 for measuring the pH of the hot water in the bathtub 220 was also installed. On the other hand, as a system according to a comparative example, a system capable of generating carbon dioxide microbubbles by a pressure dissolution method was installed in a bathtub in which hot water was stored. The following various evaluations were performed using such a system.

<2. Evaluation results>
(2.1. About the bubble size of microbubbles)
The bubble diameter of microbubbles generated in each system was measured. The bubble diameter was directly measured by a microscope, and the bubble diameter distribution was also measured from the speed of the rising bubbles by the light transmission method. The results are shown in FIG.

  As apparent from the results shown in FIG. 4, when microbubbles were generated by the system according to the example, microbubbles of various sizes were generated from 10 μm to 80 μm. On the other hand, in the system according to the comparative example, a large amount of microbubbles of about 30 μm were generated and there was almost no variation. When the average bubble diameter of the microbubbles was calculated, it was 51 μm in the case of the system according to the example and 31.5 μm in the case of the system according to the comparative example. In the system according to the example, it can be seen that the bubbles in the gas-liquid two-phase flow are divided into various diameters by the shearing force.

(2.2. Zeta potential of microbubbles)
The zeta potential of microbubbles generated in each system was measured. The zeta potential was measured by electrophoresis. The results are shown in FIG.

  As is clear from the results shown in FIG. 5, when microbubbles were generated by the system according to the example, the zeta potential of the microbubbles varied greatly from −70 mV to −20 mV. On the other hand, in the system according to the comparative example, the zeta potential was an approximately constant value of about −10 mV. In either case, no correlation between the zeta potential and the bubble diameter was confirmed. When the average zeta potential of the microbubbles was calculated, it was −42 mV in the case of the system according to the example, and −10 mV in the case of the system according to the comparative example. From this result, it was found that the microbubbles obtained by the system according to the example have a high zeta potential and are excellent in dispersibility.

(2.3. Bubble shrinkage rate)
Of the microbubbles generated in each system, focusing on the 20 μm microbubbles, the contraction speed of the microbubbles was measured. The contraction speed was measured by introducing bubbles into the cell (flow channel) and observing the contraction of the bubbles with a microscope. The results are shown in FIG.

  As is apparent from the results shown in FIG. 6, the bubble contraction speed of the microbubbles obtained by the system according to the example is smaller than that obtained by the system according to the comparative example. That is, it was found that the microbubbles obtained by the system according to the example have a long bubble life.

(2.4. Dissolution concentration of carbon dioxide when using artificial carbonated spring)
The dissolution efficiency of carbon dioxide gas with respect to warm water (volume: 9 L, temperature: 40 ° C.) was evaluated using each system. In the system according to the example, an artificial carbonated spring was manufactured by generating microbubbles in warm water at a carbon dioxide gas pressure of 0.04 MPa and a carbon dioxide gas flow rate of 200 ml / min. In the system according to the comparative example, the pressure in the tank was set to 0.4 MPa, and the carbonated solution dissolved under pressure was supplied in warm water (9 L) at 40 ° C. in an amount of 200 ml / min to produce a carbonated spring. For reference, the dissolution efficiency when simply bubbling carbon dioxide at 200 ml / min in warm water was also evaluated. The evaluation index was the pH of the obtained artificial carbonated spring. That is, the lower the pH, the higher the concentration of carbon dioxide dissolved in the artificial carbonated spring. The results are shown in FIG.

  As is apparent from the results shown in FIG. 7, when an artificial carbonated spring is manufactured by the system according to the example, the pH of the artificial carbonated spring can be lowered to about 4.5. That is, it is possible to easily manufacture a so-called high concentration carbonated spring. On the other hand, in the system according to the comparative example, the pH decreased only to about 4.7 even after a long time.

  In the system according to the embodiment, microbubbles having a high zeta potential can be generated. As a result, the dispersibility of the microbubbles can be increased and the microbubbles can remain in warm water for a long time. In this case, it is considered that such an effect cannot be obtained and the microbubbles are rapidly degassed. That is, in the system according to the comparative example, it is considered that the carbon dioxide gas was degassed at a rate higher than the supply of the supersaturated solution, and the pH could not be lowered. As is clear from the results shown in FIG. 7, the carbon dioxide gas cannot be dissolved at a high concentration by simply bubbling, and microbubbles can be generated in a shearing manner through the slit as in the embodiment. The effect is clear.

  As a precaution, the case of changing the bubbling carbon dioxide flow rate was also evaluated. The results are shown in FIG. As is apparent from the results shown in FIG. 8, even if the carbon dioxide gas flow rate of bubbling is changed, the pH is only lowered to about 5.0, and a high concentration carbonated spring as obtained by the system according to the example is manufactured. I couldn't.

(2.5. Sustainability of CO2 solubility in artificial carbonated springs)
The solubility rate of each artificial carbonated spring obtained as described above was measured. Specifically, each obtained artificial carbonated spring was allowed to stand for a predetermined time, and the change with time in the increase in pH was measured. The results are shown in FIG.

  As is clear from the results shown in FIG. 9, the artificial carbonated spring obtained by the system according to the example only increased in pH by about 0.2 (about pH 4.7) even after 12 hours from the start. In the carbonated spring obtained by the system according to the comparative example, the pH increased by 0.3 or more (pH 5 or more) from the start after 12 hours. The same applies to the carbonated spring obtained by bubbling, and the pH increased by 0.3 or more, and the dissolved concentration of carbon dioxide gas could not be maintained. That is, according to the system according to the embodiment, not only can a high concentration carbonated spring be produced, but also an artificial carbonated spring that can maintain the dissolved concentration of carbon dioxide gas for a long time can be obtained.

  Thus, according to the system concerning an example, a high concentration carbonated spring can be manufactured easily and the carbon dioxide gas concentration in a carbonated spring can be maintained over a long time. Therefore, an excellent warm bath effect can be expected. In order to demonstrate this, the physiological activity effect of the obtained artificial carbonated spring was confirmed. In addition, microbubbles were generated using air instead of carbon dioxide gas to produce an artificial microbubble spring, and the physiological activity effect of the obtained artificial microbubble spring was also confirmed.

(2.6. About the physiological activity of artificial carbonated spring and artificial microbubble spring)
Spontaneously hypertensive rats (SHR) were used as specimens. Prior to the warm bath, the rats were anesthetized with ether and allowed to rest at room temperature for 5 minutes, followed by a warm bath (40 ° C.) for 15 minutes. Rectal temperature change was measured for each of 5 minutes rest, 15 minutes warm bath, and 10 minutes after warm bath. When the same experiment was performed five times on four rats, the same tendency was observed in all of them. The results for one individual are shown in FIG.

  As is apparent from the results shown in FIG. 10, when a warm bath is performed with an artificial carbonated spring obtained by the system according to the example, the rectal temperature of the rat in the warm bath is higher than the hot water temperature (40 ° C.). The temperature rose to 7 ° C. It was also found that the body temperature did not drop rapidly even after 10 minutes from bathing, and it was difficult to cool down with hot water. Similar effects were confirmed not only with artificial carbonated springs but also with artificial microbubble springs using air.

  On the other hand, in the artificial carbonated spring obtained by the system according to the comparative example, the rectal temperature of the rat in the hot bath increased only to about the hot water temperature. It should be noted that the body temperature decreased relatively slowly in the 10 minutes after bathing, and it can be said that it is more difficult to cool with hot water with an artificial carbonated spring than with warm water with 40 ° C.

  As described above, by generating microbubbles in a shearing manner through the slit, microbubbles having properties (zeta potential, bubble diameter, contraction speed, etc.) different from conventional ones can be generated with a simple system configuration. As a result, it was found that an artificial microbubble spring having an excellent warm bath effect can be produced.

(2.7. About purification effect of warm water)
In addition, as a result of the inventors' diligent research, in addition to the warm bath effect described above, in the artificial microbubble spring obtained by the system according to the present invention, the microbubbles are floating substances (dust etc.) in the hot water. It was found that the surface could be covered and the suspended matter could float up to the surface of the water, and the suspended matter in the hot water could be easily removed. For example, when microbubbles were generated in an emulsion of water and oil (sesame oil), the oil could be effectively levitated. Furthermore, when the fiber pieces were precipitated in warm water and microbubbles were generated in response thereto, most of the fiber pieces were able to float up to the water surface.

  Although the present invention has been described with reference to the most practical and preferred embodiments at the present time, the invention is not limited to the embodiments disclosed herein. The artificial microbubble spring manufacturing system and the artificial microbubble spring manufacturing method can be changed as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification. It should be understood as encompassed within the scope of the present invention.

  According to the manufacturing system of the artificial microbubble spring according to the present invention, it is possible to manufacture an artificial microbubble spring having an excellent warm bath effect at a low cost. The system has a very simple configuration and can be easily installed in a bathroom of a general household.

DESCRIPTION OF SYMBOLS 10 Microbubble generating means 10a Hot water inlet 10b Gas inlet 10c Tubular body 10d Restriction part 10s Slit 100 Artificial microbubble spring manufacturing system 110 Bath 200 System according to the embodiment 210 Micro bubble generating means 220 Bath 230 Pump 240 Flow meter 250 Gas cylinder 260 pH measuring device

Claims (6)

A system for producing an artificial microbubble spring that generates microbubbles from a microbubble generating means and dissolves gas contained in the microbubbles in warm water,
The microbubble generating means is provided with a slit, and the microbubble is generated in the warm water by discharging a gas-liquid two-phase flow into the warm water in a shearing manner through the slit.
Artificial micro bubble spring manufacturing system.   The system for producing an artificial microbubble spring according to claim 1, wherein the microbubble has a zeta potential of -20 mV or less.   The artificial micro-bubble spring manufacturing system according to claim 1 or 2, wherein the gas is carbon dioxide or air. A step of generating microbubbles in the warm water by discharging a gas-liquid two-phase flow into the warm water in a shearing manner through the slit;
Dissolving the gas contained in the microbubbles in the warm water through the interface between the generated microbubbles and the warm water;
A method for manufacturing an artificial microbubble spring.   The method for producing an artificial microbubble spring according to claim 4, wherein the microbubble has a zeta potential of −20 mV or less.   The method for producing an artificial microbubble spring according to claim 4 or 5, wherein carbon dioxide or air is used as the gas.