JP2007289903A - Micro-bubble generating device and bath system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably generate micro-bubbles of a high concentration by a simple small device and prevent bubbles having a large diameter from being generated from a gas-liquid mixing tank. <P>SOLUTION: A micro-bubble generating device has an orifice fixed valve 7 for sucking air installed on a suction pipe 4 for sucking water 5 by a pump 1, the gas-liquid mixing tank 10 in which the water 5 from the pump 1 is introduced and stirred and a pressure detector 18 for detecting the pressure of an air phase A' in the upper part of a mixing chamber 13 of the gas-liquid mixing tank 10. The device is further provided with a controller 19 to which the detection pressure 18a of the pressure detector 18 is inputted for executing the control of setting the pump 1 at a discharge pressure to keep the pressure at which all the air phase A sucked through the orifice fixed valve 7 is dissolved in the water in the gas-liquid mixing tank 10 when the temperature of the water is the highest using temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a microbubble generator that generates microbubbles in water, and a bath system that includes a microbubble generator and a bath water circulation device that cleans bath water.

  Conventionally, various bubble generating devices that generate microbubbles in water to change the water to milky white have been proposed. When microbubbles are generated in water, warm bath effect, peeling / cleaning effect, sterilization / purification It is known that effects can be expected.

  As a conventional bubble generating device, a pump connected to a liquid storage tank for storing liquid via a water absorption conduit, and branched and connected in the middle of the water absorption conduit, and in the water absorption conduit as the pump is driven It has a gas suction port for sucking gas, and a water discharge pipe that connects the discharge side of the pump and the liquid storage tank. When the pump is driven, liquid from the liquid storage tank and gas from the gas suction port A configuration in which fine bubbles are generated in the liquid storage tank by being sucked and dissolved in the liquid under pressure in the pump and discharging the liquid containing the dissolved gas into the liquid storage tank. The pressure detection means for detecting the discharge pressure of the pump, the gas suction amount adjustment means for changing the suction amount of the gas sucked from the gas suction port, and the gas suction amount adjustment means based on the detection result of the pressure detection means Control And a control means, even if the water surface (suction lift real) changes in the bath is that so as to hold constant the occurrence of fine bubbles. And in this apparatus, the air which was not melt | dissolved in water is isolate | separated with the air vent valve with which the dissolution tank was equipped, and it is made to discharge | emit to air | atmosphere (refer patent document 1 etc.).

Further, in the bubble generating device having the same configuration as described above, water from the circulation pump is jetted by the jet nozzle provided in the upper part of the gas-liquid mixing tank, and air is engulfed by the collision with the bath water and stirred to the water. There is one that increases the amount of dissolved air. And in this apparatus, when the air in the gas-liquid mixing tank decreases, in order to compensate for it, the solenoid valve of the venturi air inlet is opened at a set time, or air is introduced, or the gas-liquid mixing tank The amount of air to be sucked is adjusted by a method such as detecting the liquid level height with a level sensor and controlling the opening and closing of the solenoid valve. Therefore, in this apparatus, the air vent valve provided in the dissolution tank of Patent Document 1 is used. Is omitted (see Patent Document 2, etc.).
JP 09-173404 A JP 2001-179241 A

  As shown in Patent Document 1 and Patent Document 2, the conventional bubble generating device dissolves air in water by sucking water with a pump and simultaneously sucking and pressurizing air, and the air is dissolved. The principle is that air dissolved in water is generated in the form of microbubbles by releasing the pressure of the pressurized water under reduced pressure. The amount of dissolved air in water is, for example, about 0.5 to 0.7 mg / L. In order to match (balance) the amount of air sucked and the amount of air dissolved in water, various methods have been conventionally considered.

  That is, conventionally, as in Patent Document 1, the amount of air to be sucked is adjusted by an intake air amount adjustment valve provided with a needle. At this time, since intake air amount adjustment valve is difficult to adjust the intake of a minute amount of air, Excess air that could not be dissolved in water as it was taken in excessively was discharged to the outside, and as shown in Patent Document 2, the amount of air taken in by opening and closing the venturi air introduction path with a conductive valve was reduced to water. There are mainly methods for controlling the amount of dissolved air.

  However, in Patent Document 1, the amount of air taken in is adjusted by an intake air amount adjustment valve equipped with a needle. However, it is very difficult to adjust the intake of a minute amount of air by an intake air amount adjustment valve, and the apparatus is very difficult. It becomes expensive and practically impossible to apply to a bubble generator or the like.

  Therefore, in the case of implementing Patent Document 1, an intake air amount adjustment valve that is relatively rough and inexpensive to provide can be used, but in this case, excessive air is sucked. Therefore, the excess air that could not be dissolved in water needs to be exhausted to the atmosphere from an air vent valve provided in the dissolution tank, which causes a problem that the configuration becomes complicated. Furthermore, in Patent Document 1, since the air sucked into the liquid sucked by the pump is dissolved and it is simply guided to the liquid storage tank through the dissolution tank, the solubility of the air in the liquid cannot be increased. Therefore, there is a problem that the amount of microbubbles generated in the liquid storage tank is limited to be low.

  On the other hand, in the case of the device shown in Patent Document 2, when the air in the gas-liquid mixing tank decreases, the amount of air taken in by controlling the opening of the solenoid valve at the air inlet of the venturi in order to compensate for it is reduced. Since the adjustment is made, an expensive intake air amount adjustment valve as in Patent Document 1 is unnecessary, and an air vent valve provided in the dissolution tank can be omitted. Further, pressurized water is injected into the injection nozzle. Therefore, the agitation of water and air can be enhanced.

  However, in Patent Document 2, since the intake of air is controlled by opening and closing the venturi with a solenoid valve, there is a problem that the control becomes very difficult. That is, when the solenoid valve is opened at a set time and air is introduced, it is very difficult to match the amount of air to be sucked with the amount of air dissolved in water, and the amount of air to be sucked is insufficient. In this case, the amount of microbubbles is reduced, and if the amount of air to be sucked becomes excessive, large-diameter bubbles will flow out of the gas-liquid mixing tank, and the large-diameter bubbles will squeeze out into the bathtub. Problem arises. Further, when the level of the liquid level in the gas-liquid mixing tank is detected by a level sensor and the opening / closing of the solenoid valve is controlled, the configuration of the gas-liquid mixing tank becomes complicated and the apparatus becomes expensive. There is. That is, in the gas-liquid mixing tank, stirring is performed while generating large-diameter bubbles by injection of pressurized water, so that detection of the liquid level is technically difficult and the apparatus becomes complicated. Furthermore, in Patent Document 2, the discharge pressure of the pump fluctuates every time the solenoid valve is opened and closed to suck or shut off air. For this reason, large-diameter bubbles generated by stirring in the gas-liquid mixing tank There is a problem that large diameter bubbles are discharged to the bathtub by flowing out with the dissolved water. Therefore, in order to reduce the problem of large-sized bubbles flowing out from the gas-liquid mixing tank in Patent Document 2, it is possible to increase the vertical length of the gas-liquid mixing tank so that the large-sized bubbles are easily separated. Although effective, in such a case, there is a problem that the apparatus becomes large.

  Moreover, in the bubble generator shown in the said patent document 1, 2, generation | occurrence | production of the microbubble when the temperature of water changes is not considered at all.

  FIG. 4 shows the dissolved amount (saturated concentration) of air in water when the temperature of water is changed from 0 ° C. to 40 ° C. at a constant pressure. According to FIG. 4, it is clear that air becomes difficult to dissolve in water as the water temperature increases. The amount of air dissolved in water at 0 ° C. is 38 mg / L, whereas the amount of air dissolved in water at 40 ° C. is 17.8 mg / L. The dissolution amount of bismuth decreases to half.

  Therefore, when the air generation amount is controlled in consideration of the water temperature in the bubble generators of Patent Documents 1 and 2, the control may be further complicated.

  The present invention has been made in view of the above circumstances, can stably generate high-concentration microbubbles with a simple and small device, and prevents the problem of large-sized bubbles flowing out from a gas-liquid mixing tank. A microbubble generator made possible and a microbubble generator combined with a bath water circulation device to generate microbubbles by the microbubble generator and to circulate clean water generated by the bathwater circulation device to the bathtub It is intended to provide a bath system that can be used.

  The present invention includes a pump that sucks and pressurizes water and air through a suction pipe and discharges the compressed water into a discharge pipe, and agitates the water and air by injecting pressurized water mixed with air into the mixing chamber from above. A microbubble generator comprising: a gas-liquid mixing tank that dissolves water in water; and a decompression nozzle that generates microbubbles by depressurizing water derived from the lower part of the gas-liquid mixing tank. Install an orifice fixed valve for air suction, and install a pressure detector that detects the pressure of the air phase in the upper part of the mixing chamber of the gas-liquid mixing tank. Enter the detected pressure of the pressure detector, and the water temperature is the highest. A control device is provided for setting and controlling the discharge pressure of the pump so as to maintain a pressure at which all of the air sucked from the orifice fixed valve at the operating temperature is dissolved in the water of the gas-liquid mixing tank. micro Bull generator, but according to the.

  In the microbubble generator, it is preferable that the controller sets the discharge pressure by the pump with the bathing temperature as the maximum operating temperature.

In the microbubble generator, it is preferable that an inlet port diameter of the orifice fixed valve is 0.10 to 0.20 mm and a discharge pressure by the pump is 2.5 to 3.2 kg / cm ² .

  Further, in the microbubble generator, the gas-liquid mixing tank includes an injection nozzle that injects water from the discharge pipe downward from an upper part of the mixing chamber, and a water that is injected from the injection nozzle so as to collide vertically. It is preferable to have a collision plate that is disposed at a distance between the inner wall surface and the inner wall surface of the mixing chamber.

  Further, the present invention connects a bath water circulation device having at least a filter and a circulation pump to the suction pipe via a circulation pipe, and connects the pump side and the circulation pipe from the connection section of the circulation pipe in the suction pipe. A check valve for preventing the backflow of water to the connection part side is provided, and the generation of microbubbles by the microbubble generator and the circulation of returning the clean water treated by the bath water circulation device to the bathtub are performed. The present invention relates to a bath system characterized by the above.

  In the bath system, it is preferable that the bath water circulation device has a heater.

  In the above bath system, it is preferable that the bath water circulation device has a sterilizing means.

  According to the microbubble generator of the present invention, the pressure detector for attaching the orifice fixing valve for air suction to the suction pipe for sucking water and detecting the pressure of the air phase in the upper part of the mixing chamber of the gas-liquid mixing tank is provided. The pump is installed so that the pressure detected by the pressure detector is input and the pressure at which all of the air sucked from the orifice fixing valve is dissolved in the water of the gas-liquid mixing tank when the water temperature is at the maximum operating temperature is maintained. Since the control device for setting and controlling the discharge pressure is provided, the complicated configuration for controlling the air suction amount as in the prior art can be omitted by using the orifice fixed valve with a simple configuration. An excellent effect can be obtained in that the configuration of the apparatus can be remarkably simplified and an inexpensive apparatus can be provided.

  In addition, the pump discharge pressure is set and controlled so that all of the air sucked from the orifice fixed valve is dissolved in water in the gas-liquid mixing tank at the maximum operating temperature where the amount of air dissolved in water is low. Even if the water temperature changes, excess air that cannot be dissolved does not accumulate in the gas-liquid mixing tank, so that there is an effect of reducing the problem that large diameter bubbles are led to the pressure reducing nozzle and discharged.

  Further, since the discharge pressure of the pump is always kept substantially constant and does not fluctuate rapidly, it is possible to further reduce the problem that large-sized bubbles separated in the gas-liquid mixing tank are accompanied by water and flow out to the decompression nozzle. effective.

  The gas-liquid mixing tank is disposed in the mixing chamber so that the water in the discharge pipe is sprayed downward from the upper part of the mixing chamber and the water sprayed from the jet nozzle collides vertically. Because it has a collision plate that forms an annular interval with the wall surface, water jetted from the injection nozzle is vigorously stirred with air while generating bubbles by colliding with the collision plate at a close distance, This has the effect of significantly increasing the dissolution of air in water. Furthermore, since the water colliding with the center side of the collision plate will circulate by forming an upward flow while moving to the outer peripheral side, large diameter bubbles generated at the time of collision will also circulate with the water, Therefore, since large-sized bubbles are prevented from being led out below the collision plate, excess air that cannot be dissolved does not accumulate in the gas-liquid mixing tank, and the discharge pressure of the pump fluctuates rapidly. In combination with this, there is an effect that even if the gas-liquid mixing tank is downsized, it is possible to simultaneously improve the dissolution of air and prevent the large-sized bubbles from flowing out downstream.

  Furthermore, in the bath system of the present invention, a bath water circulation device having at least a filter and a circulation pump is connected to the suction pipe via a circulation pipe, and the pump side and the Since each of the circulation pipes is provided with a check valve for preventing the backflow of water to the connection side, the bath water taken out by one suction pipe is guided to the microbubble generator to generate microbubbles, Also, it is possible to circulate the clean water obtained by conducting the treatment to the bath water circulation device to the bathtub, and thus generate micro-bubbles with high concentration in the clean bath water treated by the bath water circulation device. It is possible to achieve an excellent effect that an effective and refreshing bath can be performed.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows an example of a microbubble generator for carrying out the present invention, and shows a case of a microbubble generator 41 provided in a bathtub 2. In FIG. 1, reference numeral 1 denotes a pump (vortex pump). The pump 1 sucks and pressurizes water 5 (hot water) in the bathtub 2 through a suction port 4 provided in the bathtub 2 and applies pressure. The pressurized water 5 is discharged to the discharge pipe 6.

  Connected to the inlet of the pump 1 in the suction pipe 4 is an air intake pipe 8 provided with an orifice fixed valve 7 having a constant opening so as to suck air A. In addition, the said orifice fixed valve 7 can use what was provided with the inlet port diameter of 0.10-0.20 mm, for example. Further, the air intake pipe 8 is provided with a check valve 9 for preventing the water 5 of the suction pipe 4 from being ejected outside through the orifice fixing valve 7.

  The water 5 mixed with the A air by the orifice fixed valve 7 and pressurized by the pump 1 is guided to the gas-liquid mixing tank 10 by the discharge pipe 6 and is stirred in the gas-liquid mixing tank 10 to be air to the water 5. The dissolution of A is enhanced. The air-dissolved water 5 a in which the dissolution of the air A is enhanced in the gas-liquid mixing tank 10 is led out to the supply pipe 11 from the outlet 13 a at the bottom of the gas-liquid mixing tank 10, and then is supplied to the decompression nozzle 12 provided in the bathtub 2. The microbubbles S are generated in the water 5 of the bathtub 2 by being guided and decompressed by the decompression nozzle 12 and ejected into the bathtub 2.

  FIG. 2 shows the details of the gas-liquid mixing tank 10, and an injection for injecting water 5 guided from the discharge pipe 6 downward from the upper part in the mixing chamber 13 to the upper part of the gas-liquid mixing tank 10. A nozzle 14 is provided. Further, a horizontal, for example, disc-like shape is formed in the middle of the upper and lower positions in the mixing chamber 13 so that the water 5 jetted from the jet nozzle 14 collides to promote the stirring of the water 5 and the air of the air phase A ′. The collision plate 15 is arranged. The collision plate 15 forms an annular interval 16 between the collision plate 15 and the inner wall surface 13 b of the mixing chamber 13. In FIG. 2, the collision plate 15 is suspended and fixed to the ceiling surface of the mixing chamber 13 by a fixing member 17.

  The collision plate 15 is provided by selecting the distance L from the injection nozzle 14 and the size of the annular interval 16 between the inner wall surface 13 b of the mixing chamber 13.

Further, the gas-liquid mixing tank 10 is provided with a pressure detector 18 for detecting the pressure of the air phase A ′ in the upper part of the mixing chamber 13, and the detected pressure 18 a of the pressure detector 18 is supplied to the control device 19. Have been entered. The control device 19 controls the pump 1 so as to maintain a pressure at which all of the air A sucked from the orifice fixed valve 7 is dissolved in the water 5 in the gas-liquid mixing tank 10 when the water temperature is the maximum use temperature. A control signal 19a is sent to control the discharge pressure of the pump 1. In FIG. 1, the control device 19 is provided with a maximum use temperature setting means 20, and the maximum use temperature setting means 20 can set the maximum temperature of hot water to be used, for example, with a touch panel or the like. Although the maximum use temperature setting means 20 may not be provided, the provision of the maximum use temperature setting means 20 is suitable when it is necessary to change the temperature of hot water to be used. As the maximum use temperature, for example, 41 to 43 ° C., which is a normal hot water temperature during bathing, can be arbitrarily selected as the set temperature. As the pump 1, a pump that can maintain a discharge pressure of 2.5 to 3.2 kg / cm ² can be used.

  Further, a hot water supply pipe 22 is connected to the suction pipe 4 of FIG. 1 via a switching valve 21a, while a shower head having a decompression nozzle (not shown) at the tip is connected to the supply pipe 11 via a switching valve 21b. The shower piping 23 provided is connected, and by simultaneously switching the switching valve 21a and the switching valve 21b, water (hot water) from the hot water supply pipe 22 is passed through the suction pipe 4 through the pump 1 and the gas-liquid mixing tank 10. The water is guided to the shower pipe 23 and decompressed by a decompression nozzle so that the water of the microbubbles S can be ejected from the shower head. At this time, when the temperature of the hot water from the hot water supply pipe 22 is equal to or lower than the temperature of the hot water in the bathtub 2, it can be used as it is, but the temperature of the hot water from the hot water supply pipe 22 is higher than that of the hot water in the bathtub 2. When using at a temperature, it is preferable to set the temperature of the hot water from the hot water supply pipe 22 as the maximum use temperature.

  FIG. 3 shows an example of the control circuit 24 in the control device 19. The control circuit 24 is connected to a leakage breaker 27 via a noise filter 25 and a power switch 26, and the leakage breaker is also shown in FIG. 27 is connected to a tilt switch 28 attached to the microbubble generator 41 of the present invention.

  The control circuit 24 is supplied with a detected pressure 18a (FIG. 1) from the pressure detector 18 and a rotational speed signal from an encoder 29 that detects the rotation of the pump motor of the pump 1. Further, the control circuit 24 is provided with a driving operation switch 30 for turning on / off the driving.

  The operation of the above embodiment will be described below.

  In the microbubble generator 41 of FIG. 1, when the pump 1 is driven by operating the operation switch 30 of the control device 19 shown in FIG. 3, the water 5 in the bathtub 2 is sucked into the suction pipe 4 and the opening degree is increased. A predetermined amount of air A is sucked and pressurized from the fixed orifice fixed valve 7, and the water 5 mixed with the air A is supplied to the gas-liquid mixing tank 10 through the discharge pipe 6.

  The water 5 guided to the gas-liquid mixing tank 10 is jetted downward from the jet nozzle 14 provided in the upper part of the mixing chamber 13 and collides vertically with the collision plate 15 provided in the mixing chamber 13. The water 5 that has violently collided with the collision plate 15 at a close distance is well stirred with the air A while being foamed, so that the air A is effectively dissolved. At this time, the distance L between the collision plate 15 and the injection nozzle 14 and the dimension of the annular interval 16 between the outer peripheral surface of the collision plate 15 and the inner wall surface 13b of the mixing chamber 13 are selected. Since the water 5 that has collided with the center side circulates while forming an upward flow while moving to the outer peripheral side, the large-diameter bubbles generated at the time of the collision also circulate with the water 5, and thus the large-diameter bubbles Is prevented from flowing out below the collision plate 15. Therefore, only the air-dissolved water 5a that does not contain large-diameter bubbles is led out to the supply pipe 11 connected to the outlet 13a at the bottom of the gas-liquid mixing tank 10, and this air-dissolved water 5a is supplied to the decompression nozzle 12. When the pressure is reduced, stable and highly concentrated microbubbles S are generated in the bathtub 2.

  At this time, the detected pressure 18a of the pressure detector 18 provided in the gas-liquid mixing tank 10 is inputted to the control device 19, and the control device 19 is sucked from the orifice fixed valve 7 when the water temperature is the maximum use temperature. Since the control signal 19a is sent to the pump 1 to control the discharge pressure of the pump 1 so that all of the air A maintains the pressure at which the water 5 in the gas-liquid mixing tank 10 is dissolved, The amount of air A sucked from the orifice fixed valve 7 at the highest use temperature at which the solubility in water is the lowest matches the amount of air dissolved in the water 5 in the gas-liquid mixing tank 10, so that the high concentration micro The bubble S can be generated in the bathtub 2 and the water 5 in the bathtub 2 can be changed to a good milky white color. Furthermore, since excess air is not accumulated in the gas-liquid mixing tank 10, it is possible to prevent large-diameter bubbles from flowing out into the supply pipe 11 and ejecting into the bathtub 2.

  The inventor conducted the following test on the microbubble generator 41.

The inner diameter of the mixing chamber 13 is 66 mm, the length is 153 mm, the distance L between the collision plate 15 and the injection nozzle 14 is 58 mm, and the annular distance between the outer peripheral surface of the collision plate 15 and the inner wall surface 13b of the mixing chamber 13 In the case of using the gas-liquid mixing tank 10 in which the dimension of 16 is 2 mm and the distance between the collision plate 15 and the bottom surface of the mixing chamber 13 is 75 mm and 41 ° C. hot water is used, the inlet diameter of the orifice fixed valve 7 and the pump 1 When the discharge pressure of the orifice was changed to 0.15 mm and the discharge pressure of the pump 1 was 2.8 kg / cm ² , a very rich microbubble S was produced. It could be generated stably and the problem of large-sized bubbles flowing out from the gas-liquid mixing tank 10 to the supply pipe 11 could be reliably prevented. In the above test, since the gas-liquid mixing tank 10 made of a transparent material was used, a stable air phase in the gas-liquid mixing tank 10 was obtained when the discharge pressure of the pump 1 was 2.8 kg / cm ^2. It was confirmed that A ′ was not formed and air was not accumulated, and that large diameter bubbles did not flow out to the supply pipe 11.

In the above, the intake port diameter of the orifice fixed valve 7, the capacity of the pump 1, the manufacturing accuracy of the gas-liquid mixing tank 10, etc. vary, and therefore the intake port diameter of the orifice fixed valve 7 is 0.10 to 0 in consideration of these factors. The discharge pressure of the pump 1 can be selected and used within the range of 2.5 to 3.2 kg / cm ² .

  In addition, when the temperature of the hot water in the bathtub 2 becomes lower than the set maximum operating temperature, as is apparent from FIG. 4, the solubility of air in water shifts in the direction of increasing. There is no problem.

  As described above, according to the microbubble generator of FIG. 1, it is possible to use the orifice fixed valve 7 having a simple configuration, so that a complicated configuration for controlling the air suction amount as in the prior art is used. Therefore, the configuration of the apparatus can be remarkably simplified and provided at low cost.

  Further, the discharge pressure of the pump 1 is set and controlled so that all of the air A sucked from the orifice fixed valve 7 is dissolved in the water 5 of the gas-liquid mixing tank 10 when the water temperature is the maximum use temperature where the amount of dissolved air is low. Therefore, even if the water temperature changes, excess air that cannot be dissolved in the gas-liquid mixing tank 10 is not accumulated, so that the large diameter bubbles are led to the decompression nozzle 12 and discharged. Is prevented. In addition, since the discharge pressure of the pump 1 is always kept substantially constant and does not fluctuate rapidly, large-sized bubbles separated in the gas-liquid mixing tank 10 are accompanied by the air-dissolved water 5a from the decompression nozzle 12 to the bathtub. 2 can be further reduced.

  In addition, the gas-liquid mixing tank 10 includes an injection nozzle 14 that injects the water 5 of the discharge pipe 6 downward from the upper portion of the mixing chamber 13, and the mixing chamber 13 so that the water 5 injected from the injection nozzle 14 collides vertically. And the collision plate 15 having an annular gap 16 formed between the inner wall surface 13b of the mixing chamber 13 and the collision plate 15 at a short distance. Since air bubbles are vigorously stirred while colliding vertically with the water, the solubility of the air in the water 5 is remarkably enhanced. Further, since the water 5 colliding with the center side of the collision plate 15 circulates while forming an upward flow while moving to the outer peripheral side, large-sized bubbles generated at the time of collision also circulate with the water 5. Therefore, it is possible to prevent the large diameter bubbles from being led out below the collision plate 15. Therefore, in combination with the fact that the excess air that cannot be dissolved is not accumulated in the gas-liquid mixing tank 10 as described above and the discharge pressure of the pump 1 does not fluctuate rapidly, the gas-liquid mixing tank 10 is downsized. However, the effect of improving the dissolution of air and preventing the large-sized bubbles from flowing out downstream can be achieved at the same time.

  FIG. 5 shows an example of a bath system embodying the present invention. This bath system has a microbubble generator 41 as shown in FIG. The bath water circulation device 32 is connected via The bath water circulation device 32 has at least a filter 33 and a circulation pump 34, and returns the water 5 treated by the filter 33 to the bathtub 2 through a return pipe 35.

  And the non-return which prevented the water 5 from flowing back to the said connection part 36 side from the connection part 36 of the circulation pipe 31 in the said suction pipe 4 to each of the said pump 1 side position and the said circulation pipe 31. Valves 37 and 38 are provided.

  The bath water circulation device 32 may be a heater provided with a heater 39 in addition to the filter 33 so as to heat the water 5 in the bathtub 2 to a predetermined temperature. Or you may use the thing provided with the sterilization means 40 made to sterilize with a disinfectant.

  In the bath system of FIG. 5, a bath water circulation device 32 having a filter 33, a heater 39, a sterilizing means 40, and the like and a circulation pump 34 is connected to the suction pipe 4 via a circulation pipe 31, and the suction pipe Since the check valves 37 and 38 for preventing the backflow of water from the connection part 36 of the circulation pipe 31 in FIG. 4 to the pump 1 side and the circulation pipe 31 respectively to the connection part 36 side are provided. The bath water taken out from 4 is guided to the micro bubble generator 41 to generate micro bubbles S, and the operation of guiding the bath water circulator 32 to circulate clean water after treatment is performed to the bathtub 2. Therefore, the microbubble generation device 41 generates high-concentration microbubbles S in clean bath water treated by the bath water circulation device 32, thereby enabling effective and refreshing bathing. Ukoto can.

  Note that the microbubble generator and the bath system of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

1 is an overall schematic configuration diagram of a microbubble generator for carrying out the present invention. It is sectional drawing which shows the detail of the gas-liquid mixing tank of FIG. It is a block diagram which shows an example of the control circuit in the control apparatus of FIG. It is the diagram which showed the dissolution amount of the air with respect to water when the temperature of water changes at a fixed pressure. 1 is an overall schematic configuration diagram of a bath system implementing the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump 4 Suction pipe 5 Water 6 Discharge pipe 7 Orifice fixed valve 10 Gas-liquid mixing tank 12 Decompression nozzle 13 Mixing chamber 13a Outlet 13b Inner wall surface 14 Injection nozzle 15 Collision plate 16 Space | interval 18 Pressure detector 18a Detection pressure 19 Control apparatus 20 Maximum operating temperature setting means 31 Circulation piping 32 Bath water circulation device 33 Filter 34 Circulation pump 36 Connection part 37, 38 Check valve 39 Heater 40 Sterilization means 41 Microbubble generator A Air A 'Air phase S Microbubble

Claims (7)

  A pump that sucks and pressurizes water and air through a suction pipe and discharges it into the discharge pipe. The water mixed with air is injected from above into the mixing chamber to stir the water and air and dissolve the air in water. A microbubble generator comprising: a gas-liquid mixing tank to be discharged; and a pressure-reducing nozzle for generating microbubbles by depressurizing water derived from the lower part of the gas-liquid mixing tank, wherein the suction pipe is for air suction A pressure detector that detects the pressure of the air phase in the upper part of the mixing chamber of the gas-liquid mixing tank is installed, and the detected pressure of the pressure detector is input, and the water temperature is at the maximum operating temperature. Microbubble generation characterized by comprising a control device for setting and controlling the discharge pressure of the pump so as to maintain a pressure at which all of the air sucked from the orifice fixed valve is dissolved in the water of the gas-liquid mixing tank Location.   2. The microbubble generator according to claim 1, wherein the controller sets the discharge pressure by the pump with the bathing temperature as the maximum operating temperature. 3. The micro of claim 1, wherein an intake port diameter of the orifice fixed valve is 0.10 to 0.20 mm, and a discharge pressure by the pump is 2.5 to 3.2 kg / cm ^2. Bubble generator.   The gas-liquid mixing tank is disposed in the mixing chamber such that water in the discharge pipe is sprayed downward from the upper part of the mixing chamber, and the water sprayed from the spray nozzle collides vertically. The microbubble generator according to any one of claims 1 to 3, further comprising a collision plate in which an annular interval is formed between the wall surface.   A bath water circulation device having at least a filter and a circulation pump is connected to the suction pipe via a circulation pipe, and the connection side of the circulation pipe in the suction pipe is connected to the pump side and the circulation pipe, respectively. A check valve is provided for preventing a reverse flow of water to the tub, and the generation of microbubbles by the microbubble generator according to any one of claims 1 to 3 and the clean water treated by the bath water circulator A bath system characterized by circulation to return to the back.   The bath system according to claim 5, wherein the bath water circulation device includes a heater. The bath system according to claim 5 or 6, wherein the bath water circulation device has a sterilizing means.

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