JP2005204972A - Bubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bubble generator, making the produced bubbles fine in simple and inexpensive constitution. <P>SOLUTION: This bubble generator includes: a pump 5, a suction inlet of which is connected to a liquid source through a water sucking port 12; an air suction port 14 connected to the inlet side; a stirring chamber 3 connected to a discharge opening 17 of the pump 5; a screw 10 driven to rotate with the pump 5 by a motor, thereby performing stirring operation in the stirring chamber 3; a bubble separating chamber 4 for separating bubbles thorugh a communicating hole 9 and introducing a bubble dissolving solution; and a pressure reducing regulating valve 19 connected to a takeout port 18 to reduce the pressure of the bubble dissolving solution and discharge the same. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bubble generating device that generates minute bubbles easily and inexpensively.

Bubble generators have been used for the floatation separation method in wastewater treatment processes for a long time, but relatively recently, by generating minute bubbles in bath water, body washing and massage, as well as various health enhancements Applications for measures are expanding.
This type of bubble generating device conventionally sucks air together with water on the suction side of the pump, dissolves the air in water, and outputs it as a gas-liquid mixed state.
For example, in Patent Document 1, the amount of dissolved air is increased by adding a pump that increases the pressure of the air suction portion.
Further, in Patent Document 2, the amount of dissolved air is increased by one pump by sucking air from the middle of the pump head process.
Further, in Patent Document 3, a resistor is provided that provides resistance to the discharge fluid of the gas-liquid mixing pump, and measures are taken to prevent the bubbles enlarged by the barrier plate that constitutes the resistor from being stored in this portion and directly output. ing.

Japanese Patent Laid-Open No. 7-88346 (see FIG. 1 etc.) Japanese Patent Laid-Open No. 10-33961 (see FIG. 1 etc.) Japanese Unexamined Patent Publication No. 2003-117365 (see FIG. 1, 4 etc.)

  In the thing of patent document 1, the pump for raising the pressure by the side of air suction is needed separately, and an apparatus is enlarged correspondingly and cost also increases. In addition, in Patent Document 2, only one pump is required, but it is necessary to provide an air suction port in the middle of its head, and the cost becomes high as a special pump. In addition, all of these documents focus on increasing the amount of dissolved air, and in particular, there is little intention about minimization of generated bubbles, which is a problem when applied to the various health promotion measures described above. .

  Patent Document 3 discloses a measure for preventing a bubble that has been enlarged to a certain volume by providing a barrier plate in the flow discharged from the pump, but actively pursuing miniaturization of the molten bubble. It is not a thing.

  The present invention has been made to solve the conventional problems as described above, and an object of the present invention is to obtain a bubble generating device that can realize the miniaturization of generated bubbles with a simple and inexpensive configuration.

  The bubble generating device according to the present invention is connected to a pump having a suction port connected to a liquid source, a gas introduction unit that is connected to a suction side of the pump and introduces a predetermined flow rate of gas, and a discharge port of the pump. A stirring chamber, a rotary blade provided in the stirring chamber and driven to rotate and performing a stirring operation, and an outlet for separating bubbles and introducing bubble dissolving liquid and taking out the bubble dissolving liquid at a communicating portion with the stirring chamber A bubble separation chamber provided, and a pressure reducing device connected to an outlet of the bubble separation chamber and depressurizing and discharging the bubble solution.

  In the bubble generating device according to the present invention, the gas introduced from the suction side of the pump is stirred and pressurized into the liquid by the pump, and further supplied to the liquid by the rotating blades that are driven to rotate under high pressure in the stirring chamber. The dissolution action is promoted. As a result, the degree of gas dissolution increases, and the bubbles that are vaporized by the decompression by the decompression device are extremely reduced.

  The pump originally has a function of securing a predetermined head H (pressure difference) at the same time as securing a predetermined amount of liquid flow rate Q, and requires an output capacity corresponding to the work amount Q · H. . As described above, the conventional bubble generator introduces gas to the suction side of the pump and discharges the gas-liquid mixed fluid. In this process, the gas is physically dissolved in the liquid, and the amount of dissolution increases by the so-called Henry's law due to the pressure increase by the pump. Similarly, in this process, a stirring action is generated by the rotation of the impeller of the pump, and the gas is dissolved in the liquid. This stirring action is originally for realizing the flow rate Q and the head H imposed on the pump. It is an operation and not intended to dissolve the gas into the liquid.

By the way, as a result of repeating various experiments, the present inventors have found the following phenomenon in order to pursue the miniaturization of generated bubbles. That is, when the pressure is increased, the amount of dissolved gas increases on an average macroscopic scale, but does not necessarily lead to the refinement of the generated bubbles. As will be described later, it has been found that when the stirring action is strengthened even under a constant pressure condition, the refinement of the generated bubbles is promoted.
As described above, the stirring operation of the pump is to ensure the flow rate and the head, and is generally considered to be insufficient as the stirring action for miniaturizing the bubbles. If an attempt is made to replenish this lack of stirring action with a pump, the output capacity of the pump or the number of pumps will be increased, and an increase in the size of the apparatus is inevitable. However, the stirring operation itself needs to compensate for the friction loss in the liquid due to the stirring, so that the driving power is very small.

  The present invention creatively focuses on the phenomenon as described above, and newly adopts a means for performing a stirring action under high pressure, thereby realizing miniaturization of generated bubbles in a small size and at a low cost. Hereinafter, specific examples will be described in detail with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a configuration of a bubble generating device according to Embodiment 1 of the present invention, and FIG. 2 is a configuration diagram showing the device in a fluid circuit. The configuration will be described below with reference to FIGS.
The whole is composed of a main body container 1 and a motor 2 as a drive source attached to the upper part of the main body container 1, and the main body container 1 is composed of a cylindrical case 1a, a bottom cover 1b, and an upper cover 1c.
The main body container 1 is divided into an upper stirring chamber 3 and a lower bubble separation chamber 4 by a partition plate 8. A pump 5 is attached to the upper surface of the partition plate 8, and an impeller 7 that is rotationally driven by the motor 2 via the rotary shaft 6 is accommodated therein. The partition plate 8 is provided with a communication hole 9 as a communication portion for communicating the stirring chamber 3 and the bubble separation chamber 4.

A screw 10 as a rotary blade is attached to the rotating shaft 6 over almost the entire length thereof, and is rotated by the same motor 2 as the pump 5 to perform a stirring operation in the stirring chamber 3. An air dispersion drum 11 is attached near the lower end of the screw 10 so as to cover the outer periphery of the screw 10.
The air dispersion drum 11 is provided with a large number of small holes on its side surface, and the bubbles introduced downward by the rotation of the screw 10 are dispersed into the small bubbles through the small holes so that the bubbles are easily dissolved. Dissipated into the water inside.
When bubbles are generated in a liquid source, for example, a tub in a circulation type, water (hot water) from the bathtub becomes a liquid source, and this liquid source is connected to the water suction port 12, and from the water suction port 12 Water is introduced from a predetermined position on the outer periphery of the pump 5 through the injector 13. In the injector 13, atmospheric pressure air is introduced from the air suction port 14 as a gas introduction portion into a portion where the water pressure has once decreased in the narrow portion, and is introduced into the pump 5 together with water. The air suction flow rate is adjusted by turning the air suction flow rate adjustment valve 15.

  A discharge pipe 16 is attached vertically upward from a predetermined position on the outer periphery of the pump 5, and gas-liquid mixed water from the pump 5 is introduced into the stirring chamber 3 from a pump discharge port 17 at the upper end of the discharge pipe 16. At the lower part of the bubble separation chamber 4, an outlet 18 for taking out gas-liquid mixed water under pressure in which air is sufficiently dissolved is provided. The outlet 18 is connected to a decompression adjustment valve 19 as a decompression device, and the gas-liquid mixed water under pressure is decompressed by the decompression adjustment valve 19 and discharged from the gas-liquid mixture water discharge port 20. The pressure gauge 21 detects the pressure in the stirring chamber 3.

The gas on-off valve 22 performs an operation of releasing air to the outside in accordance with the amount of stored air so that the amount of air stored in the stirring chamber 3 is constant. The structure and operating principle are as follows. .
First, the fixing portion 23 is attached through the cylindrical case 1a, and an exhaust hole 24 is formed in the center of the shaft. Furthermore, a male screw 25 is formed on the outer periphery of the fixing portion 23 inserted into the stirring chamber 3. Next, the oscillating portion 26 has a substantially bottomed cylindrical shape, and a female screw 27 formed on the inner surface of the oscillating portion engages with the male screw 25 of the fixing portion 23 so that the oscillating portion 26 can swing freely. . An intake hole 28 is formed in a portion near the bottom of the upper part of the cylinder of the swinging portion 26. Further, a water flow vane 29 is fixed to the lower portion of the cylinder of the swinging portion 26.

  Next, the operation principle of the gas on-off valve 22 will be described. As will be described later in the description of the overall operation relating to the generation of bubbles of the present apparatus, in the agitation chamber 3, gas-liquid mixed water mixed with bubbles (bubbles in an undissolved state) introduced from the pump discharge port 17 is present. A substantially mortar-shaped water surface is formed, which is stirred by the screw 10 and flows in a spiral shape with the rotary shaft 6 serving as the central axis, the height of which is determined by the amount of air stored in the stirring chamber 3.

Now, when the water surface position is low and the lower end of the water flow blade 29 does not touch the water surface, the swinging portion 26 maintains a swing position where the water flow blade 29 is in a vertical posture due to its own weight. It will be. In this state, as shown in FIG. 1, the screwing positions of the screws 25 and 27 are adjusted so that a predetermined gap is generated between the right end surface of the fixing portion 23 and the bottom inner surface of the swinging portion 26. deep. Therefore, in this state, an exhaust path is formed from the intake hole 28 of the swinging portion 26 to the gap and further from the exhaust hole 24 of the fixed portion 23 to the outside air, that is, the gas on-off valve 22 is opened, and the stirring chamber The air in 3 is discharged to the outside, the amount of stored air decreases, and the water surface position gradually rises.
As the water surface position rises, the lower end of the water flow vane 29 hits a spiral water flow, and the water flow vane 29, and hence the rocking portion 26, rocks at a predetermined angle according to the contact area. Depending on the angle, the oscillating portion 26 moves to the left in the drawing by the screwing of the screws 25 and 27, and the gap gradually becomes narrower from the state shown in FIG. As a result, the resistance of the exhaust path from the intake hole 28 of the swinging part 26 to the gap and the exhaust hole 24 of the fixed part 23 to the outside air is increased. That is, the gas on-off valve 22 approaches a closed state, and the amount of air released from the stirring chamber 3 to the outside decreases.

  By adjusting the air suction flow rate adjusting valve 15 so that the amount of air sucked from the air suction port 14 is slightly larger than the dissolved air amount determined by the pressure in the stirring chamber 3 and the flow rate of the circulating water, the stirring chamber 3 The inner water surface position is maintained at a height determined by the mounting position of the water flow blade 29 of the swinging portion 26. Therefore, if the mounting position of the water flow blade 29, particularly its height, is set appropriately, the amount of air stored in the stirring chamber 3 can be maintained at a desired constant level, and a stable bubble generation operation is realized.

Next, the whole operation | movement concerning bubble generation is demonstrated. The impeller 7, the screw 10, and the air dispersion drum 11 of the pump 5 are rotationally driven by the common motor 2 via the rotation shaft 6. Water introduced from the water suction port 12 is introduced into the pump 5 through the injector 13. In the injector 13, air having a flow rate adjusted by the air suction flow rate adjustment valve 15 is sucked from the air suction port 14 and introduced into the pump 5 together with water.
The gas-liquid mixed water discharged from the pump 5 is introduced from the pump discharge port 17 to the vicinity of the upper end of the stirring chamber 3 through the discharge pipe 16. In the stirring chamber 3, dissolution of undissolved bubbles is promoted by the stirring operation by the rotation of the screw 10, and the air in the vicinity of the screw blades stored in the upper part is pushed down into the lower water and is stored in the air dispersion drum 11. Then, it is subdivided in the process of passing through the small holes formed around the air dispersion drum 11 and diffused and dissolved in the surrounding water.

The water surface position and the amount of stored air in the stirring chamber 3 are kept substantially constant by the operation of the gas on-off valve 22 described in detail above. The water that has undergone the stirring process in the stirring chamber 3 is taken out from the communication hole 9 formed at the bottom of the stirring chamber 3, so that only the bubble dissolved water that has sufficiently dissolved is selected and introduced into the bubble separation chamber 4. become.
The bubble-dissolved water in the bubble separation chamber 4 in a pressurized state is led out from the outlet 18, is decompressed to atmospheric pressure by the decompression adjustment valve 19, and is discharged from the gas-liquid mixed water discharge port 20 into, for example, hot water in the bathtub. Microscopic fine bubbles diffuse into the hot water in the form of mist.

Next, the degree to which the stirring operation or the like contributes to the refinement of the generated bubbles was verified by experiment using this apparatus, and the result will be described.
What is important in the experiment is the measurement of the size of the generated bubbles, but it is not always easy. In typical cases, absolute measurements were performed at public laboratories (described later). In the experiment for comparing and studying the influence of the form of the pressure reducing valve, the relative measurement for observing the temporal change of the transparency was adopted.
The experiment is performed in a steady state in which the pump 5 is continuously operated and the amount of air sucked and the amount of stored air in the stirring chamber 3 is constant, and the gas-liquid mixed water discharged from the gas-liquid mixed water discharge port 20 is measured with a fluorometer. An amount of height (100 mm) corresponding to a turbidity of 10 was sampled at a height of 350 mm to obtain a sample solution. And, as the size of the generated bubbles is small and the number is large, it is considered that it takes time for the bubbles in the water to disappear and become clear, so immediately after collecting the sample liquid, The bottom portion was observed, and the time (seconds) until the transparency gradually increased and the bottom marker plate could be identified was measured. It is assumed that the longer this time, the smaller the bubbles and the greater the number. The water temperature was measured at 21 to 23 ° C. and the room temperature at 19 ° C.

FIG. 3 shows the results of comparative experiments when various conditions are changed. The operation mode in the tank was performed in three ways: when both the screw 10 and the air dispersion drum 11 were operated, when only the screw 10 was attached, and when both were removed and the stirring operation was not performed. .
In addition, for each of the above operation types, an experiment was performed by replacing three types of pressure reducing valves as the pressure reducing adjustment valve 19. The structure of each pressure reducing valve will be described later with reference to FIG.
The rightmost column in FIG. 3 shows the result of the transparency (seconds) defined above. For each combination of operation type and pressure reducing valve type, adjust the pressure reducing valve throttle to set the pressure in three stages. The experiment was conducted. In the table, the second value is blank in the case where the marker plate can be identified from the beginning of the observation, and a favorable result has not been obtained as the bubbles are miniaturized.

The pressure reducing valve (pressure reducing adjusting valve 19) opens the pressured gas-liquid mixed water in the bubble separation chamber 4 to the atmospheric pressure, and as a result of experiments on various structures, It was confirmed that it was greatly involved in the state of the generated bubbles below.
The pressure reducing valve referred to as the “pressure reducing valve 60 ° linear outlet” has the longest life in water that is the finest in bubble particles and is open to the atmosphere, based on the results of the perspective observation in FIG. When compared using the same pressure reducing valve, there is no significant difference between the case of the screw + air dispersion drum and the case of the screw alone, but the forced stirring operation in the stirring chamber 3 is greatly different from the case without stirring. It can be seen that it greatly contributes to miniaturization. The other two types of pressure reducing valves were found to be greatly inferior in terms of bubble refinement.

  Next, the structure of each pressure reducing valve will be described with reference to FIG. FIG. 6A is considered to be the best in this experiment as described above, and “A” shows the decompression operation flow path portion in an enlarged manner. In the pressure reducing operation, the valve rod 32 screwed to the valve seat 30 is rotated to advance and retreat in the direction of the rotation axis, and the tapered cylindrical concave surface 31 formed on the valve seat 30 and the tapered cylindrical convex surface formed on the tip of the valve rod 32. This is done by adjusting the annular cross-section of the channel formed perpendicularly to the axis. In the case of this type of pressure reducing valve, the outlet side, that is, the pressure reducing side flow path is formed coaxially with the pressure reducing operation flow path portion (straight exit), and therefore, regardless of the position of the valve rod 32 (pressure reducing adjustment position) The flow path cross section formed by the tapered cylindrical concave surface 31 and the tapered cylindrical convex surface 33 is always an axially symmetric annular shape, the flow of water to the outlet side is smooth, and no local decompression portion is generated. Is considered to occur with a small and uniform size.

The "reducing valve 90 ° right angle outlet" shown in FIG. 4 (b) is opposite to that in FIG. 4 (a), and after being depressurized in the pressure reducing operation flow path portion, it is bent at a right angle (right angle outlet). 3 is also inferior to the previous “straight outlet” pressure reducing valve in terms of bubble miniaturization. It is considered that this is because the flow path is greatly bent under reduced pressure that is easily vaporized, and a local reduced pressure portion is generated at this portion, leading to an increase in bubble size.
FIG. 3 also compares the case of a ball valve. Although this type is not shown, it is a simple and inexpensive one that is frequently used, and the cross-section of the flow path varies greatly depending on the valve operating position, and is inferior to that of the “right angle outlet” in the evaluation of bubble miniaturization. .

In addition, the best result was obtained in the experiment from the perspective comparison of FIG. 3, and the absolute value of the size of the generated bubbles was obtained under a condition close to (stirring operation−pressure reducing valve 60 ° linear outlet−pressure 2.5 kg / cm ² ). The following is introduced. The measurement was performed using a laser diffraction / scattering type particle size distribution measuring device at the Textile Technology Support Center of Hyogo Prefectural Industrial Technology Center. The measurement results are median diameter: 0.220 μm, average diameter: 0.237 μm, standard deviation: 0.093 μm,% particle diameter (10%): 0.352 μm, particle diameter%: 0.050 μm. It was confirmed that the size was sufficiently small as compared with bubbles generated by various bubble generators.

  As described above, in the bubble generation device according to Embodiment 1 of the present invention, the pump 5 having the suction port 12 connected to the liquid source and the gas that is connected to the suction side of the pump 5 and introduces a gas at a predetermined flow rate. A communication part between the introduction chamber 14, the stirring chamber 3 connected to the discharge port 17 of the pump 5, the rotary blade 10 provided in the stirring chamber 3 to be driven to rotate and perform a stirring operation, and the stirring chamber 3 9, the bubble separation chamber 4 having an outlet 18 for separating the bubbles and introducing the bubble dissolving liquid and taking out the bubble dissolving liquid is connected to the outlet 18 of the bubble separating chamber 4, and the bubble dissolving liquid is decompressed. And the decompression device 19 that discharges the gas, so that the dissolution of the gas is promoted by the stirring operation by the rotary blade 10, and only the bubble dissolved solution that has sufficiently dissolved through the bubble separation chamber 4 can be extracted and derived. Bubble miniaturization is realized. Here, since the stirring operation by the rotary blade 10 only has to compensate for the friction loss in the liquid due to stirring, the rotational drive power is very small, and there is an advantage that the device is simple and inexpensive.

  In addition, since the pump 5 and the rotary blade 10 are rotationally driven by the common drive source 2, the drive mechanism of the apparatus is further simplified and inexpensive.

  Moreover, since the gas on-off valve 22 that opens and closes the communication portion with the outside according to the amount of stored gas is provided so that the volume of gas stored in the stirring chamber 3 is constant, the liquid level in the stirring chamber 3 becomes constant. A stable stirring operation is always obtained.

  Further, the decompression device 19 has a decompression operation flow path portion formed in an axisymmetric manner, and a flow passage section perpendicular to the axis is formed in an annular shape, so that the decompression operation is smoothly performed and a local decompression operation is performed. No part is generated, and the generated bubbles are prevented from becoming coarse in this part.

  In addition, the pressure reducing device 19 includes a valve seat 30 having a tapered cylindrical concave surface 31 that is coaxially tapered toward the downstream side and having a tapered diameter decreasing or increasing therein, and a tapered cylindrical concave surface 31 that is coaxial with the tapered cylindrical concave surface 31. And a valve rod 32 having a tapered cylindrical convex surface 33 coaxially tapered toward the downstream side and having a tapered diameter decreasing or increasing, and formed by the tapered cylindrical concave surface 31 and the tapered cylindrical convex surface 33. Since the decompression operation is performed in the ring-shaped flow path, the decompression operation is performed more smoothly, and the generation of bubbles in the portion is reliably prevented from being coarsened.

  In addition, although the case where the water (hot water) etc. of a bathtub is utilized as an example as a liquid source has been described above, water separately stored in a tank or the like may be used. When it is not intended to be used after being used, a bubble dissolved solution having a high dissolution amount can be obtained with a simple apparatus by using a pressurized water supply as a liquid source.

Embodiment 2. FIG.
In the first embodiment, as shown in FIG. 1, the decompression adjusting valve 19 is directly attached to the outlet 18 of the bubble separation chamber 4 so as to obtain generated bubbles from the gas-liquid mixed water discharge port 20. In some cases, it is necessary to generate fine bubbles in a bathtub in the home, and the bubble generating device main body needs to be installed in a separate room away from the bathroom. In such a case, when a pipe (hose) having a required length is connected to the gas-liquid mixed water discharge port 20 of the pressure reducing adjustment valve 19 in FIG. 1 and the tip of the pipe is immersed in the bathtub, Since the decompressed bubble-dissolving water flows, the promotion of bubble formation becomes remarkable in this portion, and coarse bubbles are released from the end of the pipe, and the lifetime for maintaining the bubble state is shortened.

Therefore, in the second embodiment of the present invention, although not shown, a pipe to the bathtub is directly connected to the gas-liquid mixed water discharge port 20 of FIG. 1, and the bubble dissolved water from the bubble separation chamber 4 is pressurized. Leave it to the bathtub. In this pipe, since the original high pressure state is maintained, there is almost no generation of bubbles. Then, for example, a decompression adjustment valve as shown in FIG. 5 is connected to the tip of the pipe, and this is used by being submerged in the bathtub.
In the pressure reducing valve shown in FIG. 5, the pressure reducing operation flow path is constituted by the tapered cylindrical concave surface 31 formed on the valve seat 30 and the tapered cylindrical convex surface 33 formed on the valve rod 32. This is similar to the type of pressure reducing valve, but here, the pressure reducing valve itself can be used by being submerged in the bathtub, and as shown in FIG. Is discharged more smoothly into the bathtub, and bubbles are generated that are very small and have a long life time until disappearance.

Embodiment 3 FIG.
In the first embodiment, as shown in FIG. 1, as a configuration of the gas introduction unit, the amount of air introduced from the air suction port 14 by the air suction flow rate adjustment valve 15 is kept at a predetermined value and has a predetermined height. The water surface in the stirring chamber 3, and hence the amount of stored air, was kept constant by opening and closing the gas on / off valve 22 attached to the tank.
However, the gas introduction method is not necessarily limited to this. That is, for example, the stirring chamber and the suction side of the pump are connected by a pipe, and an injector for introducing air is inserted in the middle of the pipe. If this configuration is adopted, air having a flow rate corresponding to the pressure difference between the inlet and outlet of the pipe line is introduced, so that the pressure in the stirring chamber 3 is kept constant and a stable operation is ensured.

The bubble generating device according to the present invention is not limited to the case where it is used mainly for filling the inside of the bathtub with microbubbles for health promotion measures, but is also a floating separation means in a conventional wastewater treatment process, and further, ultrafine bubbles It is also widely applied to various sterilization treatments using the above.
In addition, the gas handled here is not limited to air, and various gases can be handled, and it is needless to say that the liquid is not limited to bathtub water or tap water.

It is sectional drawing which shows the structure of the bubble generator in Embodiment 1 of this invention. It is a block diagram showing the apparatus of FIG. 1 expressed with a fluid circuit. The result of having performed the comparative experiment of the generation | occurrence | production refinement | miniaturization of the bubble in various conditions is shown. It is sectional drawing which shows the structure of the typical pressure reduction adjustment valve used for the comparison experiment. It is a figure which shows the structure of the pressure reduction adjustment valve used for the bubble generator in Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Main body container, 2 Motor, 3 Stirring chamber, 4 Bubble separation chamber, 5 Pump, 6 Rotating shaft, 7 Impeller, 8 Partition plate, 9 Communication hole, 10 Screw, 12 Water inlet, 13 Injector, 14 Air inlet, 15 Air suction flow rate adjustment valve, 17 Pump discharge port, 18 outlet, 19 Depressurization adjustment valve, 20 Gas-liquid mixed water discharge port, 22 Gas on-off valve, 30 Valve seat, 31 Tapered cylindrical concave surface, 32 Valve rod, 33 Tapered cylinder convex.

Claims (8)

A pump having a suction port connected to a liquid source, a gas introduction unit connected to the suction side of the pump for introducing a gas at a predetermined flow rate, a stirring chamber connected to the discharge port of the pump, and a stirring chamber A rotary blade that is driven to rotate and performs a stirring operation, a bubble separation chamber having an outlet for separating the bubbles at a communicating portion with the stirring chamber and introducing the bubble-dissolved liquid and taking out the bubble-dissolved liquid; A bubble generating apparatus comprising: a decompression device connected to an outlet of the separation chamber and decompressing and discharging the bubble solution. 2. The bubble generating apparatus according to claim 1, wherein the pump and the rotary blade are rotationally driven by a common drive source. The bubble generation according to claim 1 or 2, further comprising a gas on-off valve that opens and closes a communication portion with the outside according to the amount of stored gas so that the volume of gas stored in the stirring chamber is constant. apparatus. The gas inlet has an inlet side connected to the stirring chamber, an outlet side connected to the suction side of the pump, and a gas source connected to a gas source in accordance with the pressure difference on the inlet side outlet side. The bubble generating device according to claim 1 or 2, wherein a gas having a flow rate is introduced from the gas source. 4. The pressure reducing device according to claim 1, wherein a pressure reducing operation flow path portion is formed in an axial symmetry, and a flow path cross section perpendicular to the axis is formed in an annular shape. Bubble generator. The pressure reducing device is attached to a valve seat having a tapered cylindrical concave surface that is coaxially tapered toward the downstream side and whose diameter decreases or increases in the inside, and is attached coaxially to the tapered cylindrical concave surface so as to be able to contact and separate from the tapered cylindrical concave surface. An annular flow path formed by the tapered cylindrical concave surface and the tapered cylindrical convex surface, and a valve rod having a tapered cylindrical convex surface whose diameter decreases or increases in a tapered manner coaxially toward the downstream side. 6. The bubble generating apparatus according to claim 5, wherein a decompression operation is performed. When the discharge position for depressurizing and discharging the bubble lysate is a predetermined distance away from the outlet of the bubble separation chamber,
7. The pressure reducing device according to claim 1, wherein the pressure reducing device is disposed at the discharge position, and includes a pipe having one end connected to the outlet, and the pressure reducing device is connected to the other end of the pipe. The bubble generator in any one. The bubble generating apparatus according to claim 1, wherein the liquid source is a pressurized water supply source.

Images