JP2012139646A - Micro nano-bubble generating apparatus, and micro nano-bubble water generating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a micro nano-bubble generating apparatus for generating micro nano-bubbles by causing helical water streams each having different direction to collide with each other, which highly efficiently generates the micro nano-bubbles by mixing bubbles with water well in the helical water stream thereby accelerating subdivision of bubbles and generation of fine bubbles.SOLUTION: The apparatus for generating micro nano-bubbles includes inside inner and outer pipes 1, 2 of a multitubular structure, helical grooves 3, 4 for water streams each having different direction and formed by helical members 5, 6, respectively and generates the micro nano-bubbles by causing the helical water streams 7, 8 containing the bubbles to collide with each other when discharging the helical water streams 7, 8. In the apparatus for generating micro nano-bubbles, the axial centers C1, C2 of the inner and outer pipes 1, 2 respectively are shifted from each other to arrange the pipes in an eccentric position, the groove depth D1, D2 of the helical grooves 3, 4 formed by the helical members 5, 6 in contact with the inner surfaces of the inner and outer pipes 1, 2 are continuously and repeatedly changed in the peripheral direction, thereby the helical water streams 7, 8 flowing along the helical grooves 3, 4 are repeatedly pressurized and depressurized.

Description

  The present invention relates to a micro / nano bubble generating apparatus used mainly for a micro / nano bubble water generating apparatus, and a structure of a micro / nano bubble water generating apparatus using the same.

  It is very difficult to generate nanobubble water. Conventionally, water and gas are sent from a pressure pump to a microbubble generating nozzle, and microbubbles generated by pressurization are further sheared to generate micro / nano bubble water. Yes. The diameter of the bubble, which is usually visible, is in millimeters. Micron-sized bubbles are called microbubbles, and nano-sized bubbles are called nanobubbles. In recent years, research using fine bubbles as a means for decomposing hardly decomposable organic substances such as dioxins and agricultural chemicals contained in water, sludge, and slurry has been advanced. When fine bubbles collapse, radicals such as hydrogen, oxygen, hydroxy, and nitrogen are generated, and fields in which these chemical reactions are used effectively are expanding.

  There are shearing method and pressurizing method for micronization of bubbles, but in order to send out micronized bubbles stably, it is necessary to slow down the extinction time of each bubble without fusing the bubbles again. is there. In fresh water with few ions, generation of fine bubbles is more difficult than in seawater, and stable generation of micro / nano bubbles is difficult. Therefore, in order to generate micro / nano bubbles in fresh water, the conventional method uses a pressure pump to send water flow and gas into the pipe where physical obstacles are set, and forcibly mixes with pressure. Generation of micro / nano bubbles has become the mainstream.

  However, in the above method, it is necessary to generate an excessive pressure in the generating pipe, and since it becomes a complicated structure due to the high output of the pump and the setting of physical obstacles in the pipe, it does not become a simple device, The practical level has not been reached.

  Therefore, in order to solve the above-described problems and to make the generation of micro / nano bubbles more efficient, a micro / nano valve generation method and apparatus disclosed in the following Patent Document 1 have been proposed.

  The proposed method and apparatus have a double pipe structure in which two types of pipes having different opening diameters are arranged inside and outside, and the spiral members are arranged in a spiral shape in different directions in close contact with the inner surfaces of the inner and outer pipes. In addition, two spiral grooves are formed by the inner surface of each of the inner and outer tubes and each spiral member, and micro-nano bubbles are caused to collide when simultaneously discharging spiral water streams containing bubbles and having different directions of flowing along the spiral grooves. Is to be generated. At this time, the bubbles generate high-speed friction by colliding spiral water flows in different directions, and the small bubbles shear the large bubbles in the outer tube. Thereby, static electricity is charged on the bubble surface to generate microbubbles. After each bubble is charged with a negative charge due to static electricity, each bubble can exist as a micro / nano bubble due to the repulsion of the same charge. The generated micro / nano bubbles will be crushed by the self-pressurization effect due to the surface tension at the gas-liquid interface, but at the same time the charge density of negative charges charged on the bubble surface will increase, so the electrolyte ions will be concentrated. The same action as that of the “ion shell” generated in the case of the ionic shell occurs, and it can stably exist as micro / nano bubbles even in fresh water with few ions.

  However, in the case of the proposed method and apparatus, the spiral groove in the micro / nano bubble generating part having a double tube structure has a constant width and depth, and causes a change in pressure in the spiral water flow. Rather, it is only subdivided using shear due to collision when released from the spiral groove, and further improvement is desired in terms of micro / nano bubble generation efficiency.

JP 2009-274045 A

  The present invention has been made in view of the above, and in discharging a spiral water flow by spiral grooves having different directions formed along the inner and outer surfaces of a multi-tube structure in which a plurality of tubes are arranged inside and outside. In the micro / nano bubble generation device that generates micro / nano bubbles by colliding with the water, the pressure and pressure reduction are repeated in the spiral water flow to improve the mixing of bubbles and water, and to subdivide the bubbles, The generation is promoted, and this, combined with the collision action at the time of spiral water discharge, enables the generation of micro / nano bubbles to be highly efficient.

  The present invention solves the above-described problem, and forms a multiple tube structure of an inner tube and an outer tube, and the inner surface of each tube having different spiral directions by the spiral member inside each inner and outer tube, and each spiral member In the micro / nanovalve generating apparatus, a spiral groove for flowing water is formed and collides when a spiral water flow including bubbles flowing along the spiral groove is discharged at the same time. The groove depth of the spiral groove by the spiral member in contact with the inner surface of each inner and outer tube is continuously and repeatedly changed in the circumferential direction, and the spiral water flow flowing along the spiral groove repeats pressurization and decompression. It is characterized by doing so.

  According to this micro / nanovalve generating device, a spiral water flow including bubbles flowing along a spiral groove formed by a spiral member in contact with the inner surface of each of the inner and outer tubes is pressurized as the groove depth of the spiral groove changes. By repeating the compression and decompression release continuously, the mixing of bubbles and water in the flowing water is improved, the bubbles are subdivided, the formation of fine bubbles is promoted, and when released from the spiral groove The bubbles can be further subdivided by the shearing action caused by the collision of spiral water flows in different directions.

  In the micro / nanovalve generating apparatus, the spiral member that contacts the inner surface of the outer tube is attached to the inner tube, and the space between the outer tube and the inner tube is formed as a spiral groove by the spiral member. be able to.

  In the micro / nanovalve generating apparatus, a core member is arranged eccentrically inside the inner tube, a spiral member contacting the inner surface of the inner tube is attached to the core member, and a spiral groove formed by the spiral member is provided between the inner tube and the core member. It can be formed as.

  In the micro / nanovalve generating apparatus, the ratio of the shallowest part to the deepest part of the depth of the spiral groove is 1/2 to 1/8. From the viewpoint of the effect of mixing and the effect of cell fragmentation.

  Further, the present invention is a micro / nano bubble water generating device comprising the micro / nano bubble generating device according to any one of the above-mentioned inventions, comprising a gas suction ejector for sucking a gas into the running water, and the running water following the gas suction ejector. The micro / nano bubble generating device is provided in a part of the path, and bubbles are generated by flowing the gas sucked by the gas suction ejector into the running water, and then the bubbles are subdivided by passing the micro / nano bubble generating device. It is characterized by that. Thereby, micro / nano bubble water can be generated efficiently.

  In the micro / nano bubble water generation device, a circulation pump is provided between the gas suction ejector and the micro / nano bubble generation device, and gas is ejected by the gas suction ejector in the flow channel on the pump suction side by the operation of the circulation pump. , The bubbles are dispersed, and then passed through a micro / nano bubble generating device provided in the flow channel on the pump discharge side. Thereby, the production | generation of micro / nano bubble water can be performed efficiently.

  In the micro / nano bubble water generating apparatus, an orifice is provided in the discharge side piping of the circulation pump, and the sucked bubbles can be dispersed by passing through the orifice.

  In the micro / nano bubble water generating device, the inflow side piping of the micro / nano bubble generating device is an elbow tube, the water flow is bent and rectified, and the micro / nano bubble generating device is configured by the multi-tube structure flowing water piping. It can be made to pass.

  According to the micro / nano bubble generating device and the micro / nano bubble water generating device of the present invention, the groove of the spiral groove formed along the inner surface of each tube using the eccentric arrangement of the inner and outer tubes of the multiple tube structure. By changing the depth continuously and repeatedly, pressurization and depressurization are repeated in the spiral water flow to improve the mixing of bubbles and water, and to promote the fragmentation of bubbles and the generation of fine bubbles. Due to the synergistic effect with the shearing action caused by the collision when the water flow is released, the generation of micro / nano bubbles can be made highly efficient, and the micro / nano bubble water can be generated more efficiently than the conventional apparatus.

It is the disassembled perspective view which notched a part of micro / nano bubble production | generation apparatus of this invention. It is a top view of a micro nano bubble production apparatus same as the above. It is a longitudinal cross-sectional view of a micro nano bubble production apparatus same as the above. It is explanatory drawing of schematic structure of the production | generation apparatus of the micro nano bubble water of this invention.

  Next, the micro / nano bubble generation device A1 of the present invention and the microphone / nano bubble water generation device A10 using the micro / nano bubble generation device A1 will be described based on an embodiment shown in the drawings.

  The micro / nano bubble generating device A1 of the present invention is usually a plurality of pipes having different diameters, for example, pipes forming part of a water flow path for feeding water containing bubbles sucked using a water flow by a pump, for example, As shown in the figure, two types of pipes are arranged as an inner pipe 1 and an outer pipe 2 surrounding the inner pipe 1 at intervals to form a multi-structure running water pipe, and the inner pipe 1 of the pipe and at least one outer pipe 2 Spiral water flows that are alternately different in the inner and outer directions along the inner surface, and are further collided to generate micro / nano bubbles. In the present invention, in particular, the above structure is used as a basis. Thus, by repeating the pressurization and decompression in the spiral water flow, the generation efficiency of micro-bubbles of micro bubbles is increased.

  As a pipe having a multi-pipe structure, which is a feature of the micro / nano bubble generating apparatus of the present invention, a case of a double pipe structure of an inner pipe 1 and an outer pipe 2 with an aperture ratio set to 1: 2, for example, It demonstrates concretely based on 1-3.

  The inner pipe 1 and the outer pipe 2 are made of metal or synthetic resin pipes, and differ depending on the pipe diameters of both pipes. For example, when the diameter difference is around 10 mm, the axes C1 and C2 are mutually connected. It is shifted by several mm and is arranged at an eccentric position. That is, the inner tube 1 has its axial center C1 arranged in an eccentric position with respect to the axial center C2 of the outer tube 2, and the interval between the outer surface of the inner tube 1 and the inner surface of the outer tube 2 is 180 ° opposite. It is narrow on one side of the position and wide on the other side. In the case of the figure, the inner surface of the outer tube 2 is slightly tapered in diameter from the inflow side to the outflow side in the direction of running water, and the outer surface of the inner tube 1 disposed on the inner side is the outer tube 2. It has a taper shape corresponding to the inner surface.

  Inside the inner tube 1 and the inner side of the outer tube 2 are arranged spiral members 5 and 6 that extend in a spiral manner in contact with the respective inner surfaces in different directions, and the inner surface of the inner tube 1 and the spiral member 5. The spiral groove 3 for running water is formed, and the spiral groove 4 for running water having a spiral direction different from that of the spiral groove 3 is formed by the inner surface of the outer tube 2 and the spiral member 6, respectively. The spiral water streams 7 and 8 including bubbles flowing along the lines 3 and 4 are configured to collide when they are discharged at the same time.

  The spiral member 5 in contact with the inner side of the inner tube 1 is formed in a spiral shape from the same material separately from the inner tube 1 and is then fitted on the inner periphery of the inner tube 1. As a means for fixing the spiral member 5 to the inside of the inner tube 1, a method of integrally forming a spiral groove on the inner peripheral surface of the inner tube 1 by welding, ultrasonic welding, or stereolithography can be used. In addition, the spiral member 6 in contact with the inner surface of the outer tube 2 is integrally formed on the outer periphery of the inner tube 2. When the inner tube 1 is inserted into the outer tube 2, the spiral member 6 is The outer tube 2 is fitted on the inner periphery, and a space between the outer tube 2 and the inner tube 1 is formed as a spiral groove 4 formed by a spiral member 6. The spiral member 6 is not limited to being integrally formed with the inner tube 1 but can be fixed to the inner tube 1 or the outer tube 2 by means such as welding or ultrasonic welding.

  The spiral groove 3 on the inner side of the inner tube 1 and the inner side of the outer tube 2, that is, the spiral groove 4 between the inner and outer tubes 1 and 2, are such that the radial heights of the spiral members 5 and 6 are By continuously and repeatedly changing according to the amount of deviation due to the eccentric arrangement of the tube 2, the groove depths D1 and D2 are continuously and repeatedly changed.

  That is, the spiral groove 3 inside the inner tube 1 is formed so that the inner peripheral surface of the spiral member 5 has substantially the same axis as that of the outer tube 2, so that the inner tube 1 and the outer tube 2 are eccentric. The groove depth D1 is repeatedly changed according to the amount of deviation, and the spiral groove 4 on the inner side of the outer tube 2 has an eccentricity between the inner tube 1 and the outer tube 2 by the spiral member 6 attached to the inner tube 1. The groove depth D2 is repeatedly changed according to the change in the distance between the two pipes.

  For example, the inner pipe 1 is a pipe having an outer diameter of 18 mm and an inner diameter of 13 mm on the outflow side (taper diameter side) in the flowing water direction, and the outer pipe 1 has an outer diameter of 30 mm and the outflow side (taper diameter side on the taper diameter side). ) In which the inner and outer pipes 1 and 2 are arranged with their axes C1 and C2 being eccentric by 2 mm, the spiral member 5 is 3.5 mm wide and has a radial thickness (diameter). (Direction height) is gradually changed to form a spiral with a pitch P of 10 to 15 mm in the clockwise direction, an outer diameter on the outflow side of 13 mm, and a circumscribed circle corresponding to the inner peripheral surface of the inner tube 1 The inner diameter is 6 mm and the inner tube 1 is fitted. Further, the inner pipe 1 is formed so that the spiral member 6 has a counterclockwise spiral shape with a pitch P of 10 to 15 mm while gradually changing the radial thickness (radial height) with a width of 3.5 mm. Are integrally formed on the outer peripheral surface of the outer tube 2 and fitted into the outer tube 2. As a result, the groove depth D2 of the outer spiral groove 4 is 1.5 mm on the narrower side due to the eccentricity of the inner and outer pipes 1.2, and 5.5 mm on the wider side, and the inner spiral groove. 3 is such that the axial center of the inner peripheral surface coincides with the axial center C2 of the outer tube 2, so that the groove depth D1 is 5.5 mm deep on the shallow side of the groove depth D2 of the spiral groove 4, and the groove depth. It becomes 1.5 mm shallow on the deep side of the depth D2. The change in the groove depth repeats every spiral pitch. The ratio of the shallowest part to the deepest part of the groove depths D1 and D2 is set to a range of 1/2 to 1/8, preferably 1/4 to 1/6.

  The outer diameter of the outer tube 2 is determined in accordance with the use of piping used in the micro / nano bubble water generator of the present invention. The entire length of the outer tube 2 is the entire length of the inner tube 1, that is, the spiral members 5 and 4. The length of the portion (for example, 100 mm) may be made about 40 mm longer to set a bubble collision section, which will be described later. In any case, screw portions 9a and 9b for connection to other pipes are formed on the outer periphery of both end portions of the outer tube 2.

  The cross-sectional shape of the spiral members 5 and 4 is not limited to a quadrangle such as a rectangle as shown in the figure, but may be a cross-sectional shape that forms a ridge by another polygon or a circle.

  According to the micro / nano bubble generating apparatus using the double tube structure of the above embodiment, the water flow including bubbles flowing from the inflow side of the outer tube 2 through the pipe is a spiral member in contact with the inner surfaces of the inner and outer tubes 1 and 2. 5 and 6 divides into spiral grooves 3 and 4 and flows along the spiral grooves 3 and 4 while rotating at high speed, for example, clockwise on the inside and counterclockwise on the outside.

  At this time, since the bubbles in the flowing water flowing into the outer pipe 2 are dispersed by orifices or the like as will be described later, the bubble diameters are almost the same both inside and outside, but the diameters of the inner pipe 1 and the outer pipe 2 are the same. Because of the different centrifugal force inside each, the bubble diameters in both the inner and outer tubes 1 and 2 are different, so the bubbles in the outer tube and the bubbles in the inner tube have different internal pressures, and the surface tension on the bubble surface is also different. Will be different. If bubbles of the same diameter and pressure collide, they will repel if they are fused or charged, but bubbles that have a large diameter and low internal pressure will collide with bubbles that have a small diameter and high internal pressure. If so, large bubbles are sheared. Further, when sheared, friction occurs between the bubbles, and static electricity is generated in each bubble to be charged. In this case, since the bubbles are negatively charged, the bubbles repel each other to form microbubbles.

  In addition, the spiral water streams 7 and 8 containing the bubbles are subjected to the pressurization and depressurization by repeating the change in the groove depths D1 and D2 of the spiral grooves 3 and 4, particularly the change for each spiral pitch. The spiral water flow 7, which improves the mixing of the bubbles and water in the flowing water, promotes the fragmentation of the bubbles and the generation of fine bubbles, and has different directions when discharged from the spiral grooves 3, 4. When 8 collides as shown in FIG. 2, the bubbles can be further subdivided by the shearing action, and micro / nano bubbles can be generated. The flowing water containing the micro / nano bubbles thus generated is discharged from the outer tube as a mixed discharge water flow.

  Note that a hollow portion 10 having a diameter of, for example, 6 mm is formed in the inner central portion of the spiral member 6 in the inner tube 1, and this hollow portion 10 has an action to weaken the pressure in the tube and prevent clogging of foreign matters. Yes. In the hollow portion 10, a straight tubular or solid rod-shaped core member (not shown) can be arranged as necessary.

  Next, an embodiment of a micro / nano bubble water generator A10 using the micro / nano bubble generator A1 will be described with reference to FIG.

  This micro / nano bubble water generator A10 includes a water tank 11 and a circulation part 12 for circulating water. The circulation part 12 includes a gas suction ejector 13 for sucking a gas into a water flow, a circulation pump 14 for generating a water flow, two Two micro / nano bubble generating devices A1 having a heavy tube structure are connected and configured in series via a pipe section 15, and a water flow is provided to be generated in the direction indicated by an arrow in the figure. Although there may be only one micro / nano bubble generating apparatus A1, it is preferable to connect and use a plurality of apparatuses in order to make the generation of micro / nano bubble water more efficient.

  Pump piping is circulated through the water tank 11, and a gas suction ejector 13 for sucking gas is installed on the suction side. Although the details are omitted, an air introduction pipe is arranged in the flowing water by suction of the circulation pump 14, a negative pressure is generated in the pipe, and the gas is sucked and mixed in the flowing water. Water mixed with gas is pumped from the pump discharge side to the micro / nano bubble generating device A1. At this time, the gas is in a mixed state in water and does not have a uniform bubble distribution. For this reason, an orifice 16 is provided in the tube in front of the micro / nano bubble generating device A1, and immediately after the water flow is concentrated, the water flow is bent at a substantially right angle by using an elbow pipe 17 bent mainly at a right angle in the pipe, thereby achieving a rectifying effect. It is desirable to draw out and make the dispersion of bubbles uniform. The orifice and elbow are not always necessary. For example, when bubbles in the water stream can be uniformly dispersed by other means, one or both of the orifice and elbow can be omitted.

  Note that the water flow that has passed through the first micro / nano bubble generating device A1 is in a mixed state and needs to be rectified in order to uniformly introduce bubbles into the second micro / nano bubble generating device A1, so the first micro / nano bubble generating device A1 The elbow pipe 17 is used for piping behind the nanobubble generator A1, and the water flow is bent and rectified by 90 degrees.

  For this reason, in the first micro / nano bubble generating apparatus A1, as described above, by repeating pressurization and decompression in accordance with changes in the groove depths D1 and D2 of the inner and outer spiral grooves 3 and 4, the flowing water The spiral water streams 7 and 8 that make the mixing of the bubbles and water good, promote the fragmentation of the bubbles and the generation of fine bubbles, and have different directions when discharged from the spiral grooves 3 and 4. By colliding, bubbles can be further subdivided by a shearing action, and nanobubbles can be generated. The flowing water containing the micro / nano bubbles thus generated is discharged from the outer tube as a mixed discharge water flow. Similarly, in the second micro / nano bubble generating apparatus A1, by repeating the pressurization and the decompression in the spiral water flow, the mixing of the bubbles and water in the flowing water is improved, and the bubbles are finely divided and finely divided. The generation of bubbles can be promoted, and further, the bubbles can be further subdivided by the shearing action caused by the collision of the spiral water streams 7 and 8 having different directions when discharged from the spiral grooves 3 and 4. Micro-nano bubbles can be generated with high efficiency.

  In particular, since the generation efficiency of micro / nano bubbles can be improved by repeating pressurization and decompression in a spiral water flow, the micro / nano bubble water generation device A10 is configured by using one micro / nano bubble generation device A1. This type of device can be miniaturized.

  In addition, about generation | occurrence | production of a micro / nano bubble, when treated water was produced | generated with the apparatus of this structure, although it is visually, it has become cloudy. The treated water that became clouded after a few minutes after the stop of the device returned to a transparent state, but when treated again, it was confirmed that it became clouded in a shorter time than the first treatment time. This phenomenon can be confirmed up to about 48 hours after the treatment, and thus it is clear that there are micro / nano bubbles in the treatment water that cannot be visually observed.

  In addition, although the micro / nano bubble generating device of the above-described embodiment has shown the case of the double tube structure of the inner tube 1 and one outer tube 2 as the multi-tube structure, As an outer tube, a plurality of, for example, first and second outer tubes are arranged in an eccentric position with the inner and outer axes shifted from each other with a space therebetween, and between the outer tubes, the same as in the above-described embodiment. Thus, a spiral member having a spiral direction different from that of the inner spiral groove may be disposed, and a spiral groove having a direction different from that of the inner spiral groove may be formed.

  The micro / nano bubble generating device of the present invention and the micro / nano bubble water generating device using the same can supply fine bubbles in the liquid at a high concentration. It is also possible to supply bubbles using gases such as oxygen and ozone, and when using fine bubbles as a means of decomposing persistent organic substances such as dioxins and agricultural chemicals contained in water, sludge, and slurry. It is possible to use.

  A1 ... micro / nano bubble generating device, A10 ... micro / nano bubble water generating device, C1, C2 ... axis, D1, D2 ... groove depth, 1 ... inner tube, 2 ... outer tube, 3 ... helix inside the inner tube Groove, 4 ... spiral groove inside the outer tube, 5 ... spiral member in contact with the inner tube, 6 ... spiral member in contact with the outer tube, 7, 8 ... spiral water flow, 9a, 9b ... screw part, 10 ... cavity part, 11 ... Water tank, 12 ... circulation part, 13 ... gas suction ejector, 14 ... circulation pump, 15 ... piping part, 16 ... orifice, 17 ... elbow pipe.

Claims (8)

A multi-pipe structure of an inner pipe and an outer pipe is formed, and a spiral groove for running water is formed inside the inner and outer pipes by an inner surface of each pipe having a different spiral direction by the spiral member and each spiral member. In a micro-nanovalve generator adapted to collide when a spiral water stream containing bubbles flowing along it is simultaneously released,
The axial centers of the inner and outer pipes are shifted and arranged in an eccentric position, and the groove depth of the spiral groove by the spiral member in contact with the inner surface of each of the inner and outer pipes is continuously changed repeatedly, and the spiral water flow flowing along the spiral groove is added. A micro / nanovalve generator characterized by repeating pressure and pressure reduction.   2. The micro / nano bubble generating device according to claim 1, wherein a spiral member in contact with an inner surface of the outer tube is attached to the inner tube, and a space between the outer tube and the inner tube is formed as a spiral groove by the spiral member.   The core member is arranged eccentrically inside the inner tube, a spiral member in contact with the inner surface of the inner tube is attached to the core member, and a space between the inner tube and the core member is formed as a spiral groove by the spiral member. 2. The micro / nano bubble generating apparatus according to 2.   The micro-nano bubble generating apparatus according to any one of claims 1 to 3, wherein a ratio of a shallowest part and a deepest part of the depth of the spiral groove is 1/2 to 1/8. A micro / nano bubble water generator comprising the micro / nano bubble generator according to any one of claims 1 to 4,
A gas suction ejector for sucking a gas into running water is provided, and the micro / nano bubble generating device is provided in a part of a flow channel following the gas suction ejector to generate bubbles in the running water from the gas sucked by the gas suction ejector. Thereafter, the micro / nano bubble water generating apparatus is characterized in that the bubbles are subdivided by passing through the micro / nano bubble generating apparatus.   A circulation pump is provided between the gas suction ejector and the micro / nano bubble generation device, and after the operation of the circulation pump, the gas is sucked by the gas suction ejector in the flow channel on the pump suction side, and the bubbles are dispersed. 6. The micro / nano bubble water generating device according to claim 5, wherein the micro / nano bubble generating device provided in the water flow path on the pump discharge side is passed.   The apparatus for generating micro / nano bubble water according to claim 6, wherein an orifice is provided in a discharge side pipe of the circulation pump, and bubbles sucked by passing through the orifice are dispersed.   The pipe on the inflow side of the micro / nano bubble generating device is an elbow tube, the water flow is bent and rectified, and the micro / nano bubble generating device using the pipe for flowing water having the multi-tube structure is allowed to pass through. The micro-nano bubble water generator according to any one of the above.

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