JP2015093219A - Microbubble generation device and microbubble spray device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microbubble generation device and a microbubble spray device which can apply sufficient impulsive force, that is an impact, to an object by spraying microbubble water in air at a high pressure, and can suppress an increase in cost with a simple structure.SOLUTION: A microbubble generation device includes: a holder 1 having a gas introducing hole formed to introduce gas from an external to an inside; an inlet adaptor 2 arranged from an approximately center part to a liquid inflow port side in the holder 1; a mixing adaptor 5 which is arranged from the approximately center part to a liquid outflow port side in the holder 1 and is connected to the inlet adaptor 2 by facing each other at inner end surfaces in the holder 1. The inlet adaptor 2 includes a cylinder part positioned on the liquid inflow port side of the holder 1, and a cone part positioned inside. Liquid flow passages are formed in insides of them, and an inner diameter of the cone part reduces toward the center part of the holder 1.

Description

  The present invention relates to a microbubble generator for spraying a liquid containing fine bubbles and a microbubble spray device using the microbubble generator.

  Examples of nozzles that generate microbubbles to clean an object to be cleaned include Japanese Unexamined Patent Application Publication Nos. 2008-114098, 2012-96216, and 2009-273966.

  As this type of conventional nozzle, the object to be cleaned is in water, and most of the nozzles are used underwater in which the nozzle is set in water.

JP2008-1114098 JP2012-096216 JP2009-273966

Documents 1 and 2 generate microbubbles in the water, so that water tanks for storing water and nozzles to be installed in water require work to draw out the air suction pipes to the atmosphere. There is a problem in that a space for installation is required, and in addition, it takes time to put an object to be cleaned in water, which increases the cost due to equipment and work time. Moreover, the water in a water tank becomes resistance and there also existed a subject that the impact cleaning which makes a microbubble collide with a to-be-cleaned object at high speed cannot be utilized.
Document 3 shows a nozzle that sprays a liquid containing fine bubbles in the air. However, impact cleaning is weak because of the configuration in which the liquid from the spraying port is directed along the guide wall. Moreover, when it uses by the pressure of 0.7 Mpa or more, there exists a problem of durability that a guide wall is shaved with a liquid and a spray shape and the uniformity of a spray are impaired.
Also, if microbubble water (liquid containing fine bubbles of 50 μm or less) is pressurized with a pump in order to obtain a strong impact and spraying is attempted, there is a possibility that cavitation occurs due to bubbles or the pressure is not increased due to bubbles. In addition, when the gas is forcibly injected, if the liquid pressure becomes high (eg, when the gas is forced into a liquid having a pressure of 2 MPa, the pressure of the gas needs to be 2 MPa or more), it is impossible considering the capacity of the compressor. is there.
In addition, as what is used in air | atmosphere rather than for water, there exists a commercially available shower head which sprays microbubble water in air | atmosphere. In this shower head, microbubble water is sprayed at a very low pressure, so that there is a problem that the impact of the object to be cleaned is very small.

  The present invention has been proposed in view of the above, and an object thereof is to provide a simple structure capable of injecting microbubble water into the air at high pressure to give a sufficient impact force, that is, impact to an object. An object of the present invention is to provide a microbubble generating device and a microbubble spray device that can reduce costs.

In order to solve the above-mentioned problem, the microbubble generator according to the present invention according to claim 1 is substantially cylindrical and has a holder 1 formed with a gas introduction hole 8 for introducing gas from the outside toward the inside, An inlet adapter 2 provided from approximately the center of the holder 1 to the liquid inlet side, and an inlet adapter 2 provided from approximately the center of the holder 1 to the liquid outlet side. A mixing adapter 5 facing and connected to the inner end face, and the inlet adapter 2 has a cylindrical part 2a located on the liquid inlet side of the holder 1 and a conical part 2b located on the inner side, A liquid channel 3 is formed, and the inner diameter of the conical portion 2b is reduced toward the center of the holder 1, and the mixing adapter Is formed with a liquid flow path 6 whose inner diameter is increased from the inner end toward the liquid outflow side of the outer end opening, and a liquid flow is formed at the center of the inner end of the conical portion 2b of the inlet adapter 2. A channel hole 3a is formed, and a liquid channel hole 6a that is in contact with and communicates with the center of the inner end of the mixing adapter 5 facing the channel hole 3a is formed, and the liquid channel hole 3a on the inlet adapter 2 side is formed. And the hole 6a of the mixing adapter 5 communicate with each other to form a straight cylindrical shape, and the gas introduced into the holder 1 from the gas introduction hole 8 is introduced into the holder 1 at the inner end of the mixing adapter 5. A gas suction hole 7 for suction is formed at the beginning of the diameter expansion of the path 6.
According to a second aspect of the present invention, in the microbubble generator according to the first aspect, the liquid channels 3 and 6 and the gas suction holes 7 of the inlet adapter 2 and the mixing adapter 5 form a Venturi tube structure, and the liquid It is characterized in that air in the atmosphere is sucked from the gas suction hole 7 by the Venturi effect due to the liquid flowing in the flow paths 3 and 6 to generate a liquid containing fine bubbles.
According to a third aspect of the present invention, in the microbubble generator according to the first or second aspect, the supply liquid from the liquid inlet of the inlet adapter 2 is between 0.1 MPa and 30 MPa.
According to a fourth aspect of the present invention, in the microbubble generator according to the first or second aspect, the nozzle tip has a nozzle injection port 11a on the liquid outlet side of the holder 1 and sprays microbubble water into the air. 11 has a substantially cylindrical spray adapter 10 which is detachably provided at the tip, and has a diameter φB1 of the fluid flow path hole 3a of the conical part 2b and a diameter of the liquid flow path hole 6a of the mixing adapter 5. φB2 is equal, and the diameter of the nozzle injection port 11a is larger than these diameters.
The present invention according to claim 5 is the microbubble spray device according to claim 4, characterized in that the supply liquid from the liquid inlet of the inlet adapter 2 is between 0.1 MPa and 30 MPa.
According to a sixth aspect of the present invention, in the microbubble generator according to the first or second aspect, a compressor connecting portion 12 for supplying gas is connected to the outer peripheral portion of the gas introducing hole 8 of the holder 1, and the compressor connecting portion 12 The gas supply hole 12a and the gas introduction hole 8 communicate with each other, and gas is forcibly supplied to the portion where the diameter expansion starts.
According to a seventh aspect of the present invention, there is provided the microbubble generator according to the sixth aspect, wherein the nozzle tip 11 having a nozzle injection port 11a on the liquid outlet side of the holder 1 and spraying microbubble water in the air is provided. A substantially cylindrical spray adapter 10 detachably provided at the tip is attached, and the diameter φB1 of the liquid flow path hole 3a of the conical part 2b and the diameter φB2 of the liquid flow path hole 6a of the mixing adapter 5 are Equally, the diameter of the nozzle injection port 11a is larger than these diameters.

According to the first aspect of the present invention, the number of main component parts is small, such as the holder 1, the inlet adapter 2, and the mixing adapter 5, and each member has a simple configuration, so that it is easy to assemble and the cost can be reduced. The venturi tube structure can be easily obtained by the inlet adapter 2 and the mixing adapter 5, and in this case, the gas suction hole 7 is provided at the portion where the diameter expansion starts with the largest negative pressure, so that a good suction effect can be obtained. Compared to underwater ones, installation work is less time-consuming and equipment is cheaper. Microbubble water from the outlet of the mixing adapter 5 is sprayed directly into the atmosphere, so there is no pressure loss and the object to be cleaned. On the other hand, microbubble water can be sprayed with a sufficient impact from low pressure to high pressure.
According to the second to fifth aspects of the present invention, in addition to the effect of the invention according to the first aspect, the venturi tube structure allows the air in the atmosphere to be discharged from the gas suction hole 7 by the venturi effect due to the liquid flowing in the liquid flow path. A microbubble liquid containing fine bubbles can be generated by suction. Further, microbubble water can be generated at a supply hydraulic pressure of 0.1 MPa to 30 MPa.
According to the present invention described in claim 6, since gas can be forcibly supplied, a large amount of microbubble water can be sprayed with a strong impact by gas-liquid mixing.
According to the present invention described in claim 7, in addition to the effect of the present invention described in claim 6, various spray patterns can be obtained depending on the purpose and application of the microbubble water by the replaceable nozzle injection port 11a. The detergency can be improved by the synergistic effect of the detergency of micro-bubble water and the impact of spray water with an appropriate spray pattern.

1 is a longitudinal sectional view of a gas self-priming type microbubble generator according to a first embodiment of the present invention. Explanatory drawing which shows a suitable example of the number of the gas suction holes of an Example same as the above. The modification of 1st Example of this invention is shown. The Example of the micro bubble spray apparatus using 1st Example of this invention is shown. An embodiment in which the first embodiment of the present invention is a gas forced supply type will be described. The Example of the gas forced supply type micro bubble spray apparatus same as the above is shown.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and various design changes can be made without departing from the spirit of the present invention. .

  FIG. 1 relates to a first embodiment of a gas self-priming type microbubble generator according to the present invention, in which 1 is a substantially cylindrical holder. An inlet adapter 2 as a hollow liquid supply unit is provided from approximately the center in the holder 1 to one end side, that is, from the liquid inlet side, and the hollow part in the inlet adapter 2 becomes a liquid flow path 3. Yes.

  The inlet adapter 2 includes a cylindrical portion 2a having a substantially cylindrical shape located on the liquid inlet side of the holder 1, and a conical portion 2b which is located on the central portion side in the holder 1 and gradually tapers toward the tip. I have. The cylindrical portion 2a and the conical portion 2b have an integral structure, and a step portion 2c is formed on the liquid inlet side of the cylindrical portion 2a so as to protrude outward from the end portion of the holder 1 on the liquid inlet side.

  Also, a screw portion 2d for attachment is formed on the inner side of the step portion 2c, that is, on the outer periphery of the cylindrical portion 2a that is on the liquid inlet side of the holder 1 and faces the inner peripheral portion of the holder 1 on the liquid inlet side. And the screw part 1a is formed also in the inner peripheral part of the holder 1 corresponding to this, The tip part side of the cone part 2b of the inlet adapter 2 is inserted in the holder 1, and mutual screw parts 1a and 2d are attached. The inlet adapter 2 can be easily attached to the holder 1 by screwing. When the stepped portion 2c is screwed, the inner end surface of the stepped portion 2c comes into contact with the outer end surface of the holder 1 on the liquid inlet side, functions as a stopper, and the inlet adapter 2 can be attached at a predetermined position. it can.

  Further, a 0-ring groove 2e is formed at a boundary portion between the conical portion 2b and the cylindrical portion 2a, and a sealing 0-ring 4 is provided there.

  Although the inner diameter of the cylindrical portion 2a of the inlet adapter 2 is constant, the inner diameter of the conical portion 2b is gradually tapered toward the substantially central portion of the holder 1, as shown by the arrow on the right side. The flow path of the liquid such as water supplied from the liquid inlet of the liquid flow path 3 is throttled so that the flow speed of the liquid is increased. In this case, the liquid is not limited to water.

  Reference numeral 5 denotes a hollow mixing adapter provided from a substantially central portion in the holder 1 to the liquid outlet side on the left side in the drawing. A liquid channel 6 is also formed in the hollow portion in the mixing adapter 5. The liquid flow path 6 has a tapered shape whose inner diameter gradually increases toward the liquid outlet.

  A 0-ring groove 5a is also formed in a part of the outer periphery of the mixing adapter 5 located in the holder 1, and the 0-ring 4 is provided there.

  In addition, a screw portion 1a ′ is formed on the other end of the holder 1, that is, on the inner periphery of the liquid outlet side of the holder 1, and a screw portion 5b is formed on the outer periphery of the mixing adapter 5 correspondingly, Insert the mixing adapter 5 to the holder 1 by inserting the bottom of the mixing adapter 5 (the inner end located on the center side of the holder 1) into the holder 1 and screwing the screw portions 5b and 1a 'to each other. be able to. In this case, a positioning step 5 c is formed on the outer peripheral surface of the mixing adapter 5 protruding from the holder 1 in the same manner as the step 2 c of the inlet adapter 2.

  When the mixing adapter 5 is attached to the holder 1, the inner end which is the bottom and the tip of the inlet adapter 2 are joined, and the mixing adapter has a liquid flow path 3 on the inlet adapter 2 side and a gas suction hole 7 which will be described later. 5 is connected to the liquid outlet side hole 3a on the inlet adapter 2 side and the liquid inlet side hole 6a on the mixing adapter 5 side, and the inside of the inlet adapter 2 and the mixing adapter 5 is As a whole, it is configured to form a Venturi tube structure.

  The inner diameters of the holes 3a and 6a in the connecting portion are straight cylinders. In this connecting portion, the inner diameter φB2 of the hole 3a of the liquid flow path on the liquid outlet side at the center of the conical portion on the inlet adapter 2 side is mixed. The relation of the inner diameter φB1 of the hole 6a of the liquid channel at the center of the bottom of the adapter 5 is set to φB2 = φB1 as a result of performance tests of various prototypes.

  The liquid enters the liquid flow path hole 6a of the mixing adapter 5 from the liquid flow path hole 3a side of the inlet adapter 2, and a plurality of gas suction holes 7 are formed in the part where the diameter of the liquid flow path 6 of the mixing adapter 5 starts. Is formed. That is, the gas suction hole 7 is used to generate a microbubble water by mixing a gas such as air into the liquid that has entered the mixing adapter 5, and is formed in a portion where the diameter of the liquid flow path 6 starts. As shown in FIG. 2, four are preferably formed at equal intervals. The gas to be sucked is not limited to air.

  The plurality of gas suction holes 7 are preferably small in diameter from the viewpoint of finely pulverizing air, and the number thereof is preferably in the range of 4 to 8. That is, the diameter of the gas suction hole 7 is small, and the larger the number, the finer and more microbubbles can be generated. However, from the workability and cost of the mixing adapter 5 and the microbubble generation property, 4 to 8 holes are the best workability, the mixing adapter 5 can be manufactured at low cost, and the performance is also good. That is, when the number of holes is 3 or less, the amount of microbubbles generated is small, and when the number is 9 or more, labor is required for processing, productivity is low, and cost is increased.

  In order to supply gas to the gas suction hole 7, a plurality of gas introduction holes 8 are formed at equal intervals in a portion located substantially at the center of the holder 1 and on the base side of the conical part 2 b of the inlet adapter 2. . The gas introduction hole 8 is formed orthogonal to the axial direction of the holder 1, and the gas is introduced into the holder 1 through the gas introduction hole 8.

  In the holder 1, a gas introduction part 9 consisting of a space part is defined by an inner peripheral surface of the holder 1, a tapered outer peripheral surface of the conical part 2 b, and a bottom outer peripheral surface of the mixing adapter 5. Since the inlet of the hole 7 is provided on the outer peripheral surface of the bottom part of the mixing adapter 5, the gas introduced from the gas introduction hole 8 to the gas introduction part 9 passes through the gas suction hole 7 and the hole 6 a of the liquid channel of the mixing adapter 5. It is comprised so that it may be attracted | sucked to the part where the diameter expansion starts in the vicinity of the liquid outlet.

  As described above, the main members of the microbubble water generator according to the present invention include the holder 1, the inlet adapter 2, and the mixing adapter 5. The number of parts is small, and the liquid inlet side of the holder 1 is used for assembly. If the inlet adapter 2 is inserted together with the 0-ring 4 and attached via the screw parts 1a and 2d, and the mixing adapter 5 is attached in the same manner from the liquid outlet side of the holder 1, it can be easily completed.

  In addition, a 0-ring groove having a concave shape when other components are mounted is formed at appropriate positions on the outer periphery of the holder 1, and other components are provided on the outer periphery of the liquid inlet or the outer periphery of the liquid outlet if necessary. A connecting screw portion is formed.

  Next, the operation of the present invention will be described.

  A liquid having a desired hydraulic pressure is supplied from the liquid inlet of the liquid channel 3 of the inlet adapter 2. Since the inner diameter of the liquid flow path 3 is gradually tapered and narrowed as it goes deeper, the flow velocity of the liquid increases and the pressure decreases due to the venturi effect.

  The liquid enters the hole 6a of the mixing adapter 5 with the inner diameter φB1 from the hole 3a of the liquid flow path with the inner diameter φB2 of the inlet adapter 2, the flow velocity increases, and the diameter of the mixing adapter 5 gradually increases from the small diameter toward the liquid outlet. Enter the liquid flow path 6. In the present invention, since the gas suction hole 7 is provided in the portion where the diameter expansion starts where the liquid flow rate is fastest and the negative pressure is the highest, and the gas suction effect is large, the gas is the gas introduction hole 8 of the holder 1, The gas is rapidly sucked into the portion where the diameter expansion starts via the gas introduction part 9 and the gas suction hole 7, and bubbles are generated in the liquid.

  Prototypes were manufactured and tested. When the position where the gas suction hole 7 is provided is a straight cylindrical part composed of the hole 3a of the liquid channel of the inlet adapter 2 and the hole 6a of the mixing adapter 5, the vicinity where the diameter expansion starts Compared with the case where it is provided, the suction effect is poor. In the present invention, focusing on the fact that the negative pressure is the largest at the part where the diameter expansion starts, the gas suction hole 7 is provided at that part to generate bubbles.

  The liquid containing the bubbles travels through the liquid flow path 6 of the mixing adapter 5, but the inner diameter of the adapter is increased in a taper shape, so that the flow rate becomes slower and the pressure becomes higher, so that the bubbles are crushed and become fine bubbles. Micro bubbles are generated. The fine bubbles were measured to be 50 μm or less.

  The microbubbles can be adjusted by the diameter φD of the opening at the tip of the mixing adapter 5 and the taper angle θ of the expanded diameter.

  In the present invention, the gas suction portion (the diameter of the liquid channel 6 of the mixing adapter 5 is increased) by the effect of the taper and the acceleration of the flow velocity by the orifices of the hole 3a of the liquid channel of the inlet adapter 2 and the hole 6a of the mixing adapter 5. The gas can be self-supplied even when the liquid pressure on the liquid inlet side of the liquid flow path 3 of the inlet adapter 2 is increased, and suction is performed without a gas compressor such as a compressor. Microbubble water can be generated by gas and sprayed at high pressure and high speed.

  The liquid that has flowed into the beginning of the diameter expansion of the mixing adapter 5 and mixed with bubbles flows toward the outlet of the diameter φD of the liquid channel 6, but the inner diameter of the liquid channel 6 gradually increases. Due to the taper shape, the flow rate becomes slower and the pressure becomes higher. For this reason, bubbles are crushed and microbubble water is generated, and the microbubble water can be sprayed from the opening of the mixing adapter 5, that is, from the liquid outlet of the liquid channel 6.

  Although the diameter of the hole 3a of the φB2 liquid channel of the inlet adapter 2 and the diameter of the hole 6a of the φB1 liquid channel on the mixing adapter 5 side was changed, the same diameter was manufactured. A good suction effect was obtained when the diameters φB2 and φB1 of 6a were the same.

  Moreover, the taper angle θ of the mixing adapter 5 was made different, and a prototype with a taper angle θ of 10 to 30 degrees was manufactured. However, when the angle is 10 degrees, the gas suction force is strong and the amount of gas mixing can be adjusted. there were.

  FIG. 3 shows a modification of the first embodiment. In this embodiment, the outer peripheral shape of the inner end portion of the mixing adapter 5 located substantially at the center in the holder 1 is made into a bottomed cylindrical shape having a hole 6a in the center, and the inlet of the gas suction hole 7 is provided on the bottom surface. It is. Other configurations and operational effects are the same, and the same members are denoted by the same reference numerals and detailed description thereof is omitted.

  FIG. 4 shows an embodiment in which an adapter having a nozzle chip is attached to the liquid outlet side of the microbubble generator shown in FIG. 1 to form a microbubble spray unit.

  That is, reference numeral 10 denotes a spray adapter having a substantially cylindrical shape. A screw portion 10a is formed on the inner peripheral portion of one end portion to be attached to the outer peripheral portion of the other end portion of the holder 1, and the other end of the holder 1 is interposed through the screw portion 10a. What is necessary is just to attach via the screw part formed in the part.

  A nozzle tip 11 having a nozzle injection port 11 a is provided at the tip of the spray adapter 10. This nozzle tip 11 is also detachably attached to the tip of the spray adapter 10 by a screw type, and can be replaced with one having a nozzle injection port 11a from which a desired spray pattern can be obtained.

  A hollow portion 10b is formed inside the spray adapter 10, and this hollow portion 10b communicates with the liquid flow path 6 of the mixing adapter 5, and also communicates with the nozzle injection port 11a of the nozzle tip 11, and the nozzle injection port 11a. It is comprised so that microbubble water can be sprayed through. The configuration of the microbubble generator is the same as that of the embodiment shown in FIG.

  The diameter of the nozzle injection port 11a of the spray adapter 10 is larger than the diameters (φB1, φB2) of the hole 3a of the liquid channel on the inlet adapter 2 side and the hole 6a of the liquid channel on the mixing adapter 5 side. Yes.

  That is, if the diameter of the nozzle injection port 11a is smaller than the diameters (φB1, φB2) of the holes 3a and 6a of the liquid flow path, the internal pressure of the liquid flow path becomes high and gas suction cannot be performed, so microbubble water cannot be generated. Further, if the diameter of the nozzle injection port 11a is equal to the diameters (φB1, φB2) of the liquid flow passage holes 3a, 6a, the amount of mixed bubbles is small when the supply hydraulic pressure is low, and the supply hydraulic pressure is high. In this case, the gas cannot be sucked, and the liquid flows backward to the gas suction hole 7 so that good microbubble water cannot be ejected. In order to eject good microbubble water, the diameter of the nozzle injection port 11a needs to be larger than the diameters (φB1, φB2) of the holes 3a, 6a of the liquid flow path. When the diameters (φB1, φB2) <diameter 11a, the internal pressure of the liquid channel does not increase, and the liquid flow rate in the liquid channel near the gas suction hole 7 does not decrease. This is because the gas suction force by the Venturi tube effect is kept high.

  In this embodiment, the combination of the microbubble generator and the spray adapter 10 can provide a microbubble spray device that sprays microbubble water at high speed and can be used for cleaning, peeling, excavation, and the like.

  As described above, the embodiment of the type shown in FIG. 1, FIG. 3 and FIG. 4 generates microbubble water by sucking air from the atmosphere by the Venturi effect, and the position of the gas suction hole 7 is set to the position of the mixing adapter 5. Since it is provided in the vicinity of the portion where the diameter expansion of the liquid flow path 6 starts, the range of available supply liquid pressure is wide, it can be used at a high supply pressure from 0.1 MPa to 30 MPa, and produces good microbubble water. Can be jetted. In this case, the higher the supply hydraulic pressure, the stronger the impact force (impact) that the liquid hits the object. If the impact is strong, a large cleaning effect and peeling effect can be expected.

  FIG. 5 shows an embodiment in which the microbubble generator shown in FIG. 1 is of a gas forced supply type and is not of a type that sucks air from the atmosphere, but is configured to introduce pressure gas from a compressor.

  That is, the compressor connecting portion 12 connected to the compressor (not shown) is connected to the outer peripheral portion of the holder 1 through the 0 ring 4 and the gas is forced into the gas introducing hole 8 through the hollow gas supply hole 12a. It is comprised so that it can send in.

  In this case, since the liquid pumped to the liquid flow path 3 of the inlet adapter 2 does not include bubbles (bubbles), the problem of pumping by bubbles does not occur. The problems include inability to pressurize due to an air biting phenomenon caused by bubbles, damage to the pump due to a cavitation phenomenon, and the like.

  In this embodiment, a large amount of gas-liquid mixed mist can be efficiently dispersed by pumping gas.

  6 shows an example in which the spray adapter 10 having the nozzle tip 11 shown in FIG. 4 is attached to the liquid outlet side of the forced gas supply type microbubble generator shown in FIG. Other configurations are the same as those of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Holder 1a, 1a 'Screw part 2 Inlet adapter 2a Cylindrical part 2b Conical part 2c Step part 2d Screw part 2e 0 Ring groove 3 Liquid flow path 3a Liquid flow path hole 4, 4' 0 ring 5 Mixing adapter 5a 0 ring groove 5b Screw part 6 Liquid flow path 6a Liquid flow path hole 7 Gas suction hole 8 Gas introduction hole 9 Gas introduction part 10 Spray adapter 10a Screw part 10b Hollow part 11 Nozzle tip 11a Nozzle injection port 12 Compressor connection part 12a Gas supply hole

Claims (7)

A holder (1) having a substantially cylindrical shape and formed with a gas introduction hole (8) for introducing a gas from the outside to the inside, and provided from the substantially central portion in the holder (1) to the liquid inlet side. The inlet adapter (2) is provided from the substantially central portion in the holder (1) to the liquid outlet side, and the inner end faces of the inlet adapter (2) and the holder (1) are connected to face each other. A mixing adapter (5),
The inlet adapter (2) has a cylindrical part (2a) located on the liquid inlet side of the holder (1) and a conical part (2b) located on the inner side, and a liquid flow path (3) is formed inside them. And the inner diameter of the conical portion (2b) decreases toward the center of the holder (1),
Inside the mixing adapter (5) is formed a liquid channel (6) whose inner diameter increases from the inner end toward the liquid outflow side of the outer end opening,
A liquid channel hole (3a) is formed at the center of the inner end of the conical portion (2b) of the inlet adapter (2), and also contacts the center of the inner end of the mixing adapter (5) facing this. And a fluid channel hole (6a) on the inlet adapter (2) side and a hole (6a) of the mixing adapter (5) communicate with each other in a straight shape. A cylindrical shape is formed, and the gas introduced into the holder (1) from the gas introduction hole (8) is introduced into the inner end of the mixing adapter (5) at the beginning of the diameter expansion of the liquid channel (6). A microbubble generator characterized in that a gas suction hole (7) to be sucked into a part is formed.   The microbubble generator according to claim 1, wherein the liquid flow paths (3, 6) and the gas suction holes (7) of the inlet adapter (2) and the mixing adapter (5) form a Venturi tube structure, Microbubble generation characterized in that the air in the atmosphere is sucked from the gas suction hole (7) by the venturi effect by the liquid flowing through the passages (3, 6) to generate a liquid containing fine bubbles apparatus.   The microbubble generator according to claim 1 or 2, wherein the supply liquid from the liquid inlet of the inlet adapter (2) is between 0.1 MPa and 30 MPa.   3. The microbubble generator according to claim 1, wherein a nozzle tip (11) having a nozzle injection port (11 a) on the liquid outlet side of the holder (1) and spraying microbubble water in the air is a tip. A substantially cylindrical spray adapter (10) that is detachably attached to the part is attached, the diameter φB1 of the fluid channel hole (3a) of the conical part (2b) and the liquid channel of the mixing adapter (5) The diameter (φB2) of the hole (6a) is equal, and the diameter of the nozzle injection port (11a) is larger than these diameters.   The microbubble spray device according to claim 4, wherein the supply liquid from the liquid inlet of the inlet adapter (2) is between 0.1 MPa and 30 MPa.   The microbubble generator according to claim 1 or 2, wherein a compressor connecting portion (12) for supplying gas is connected to an outer peripheral portion of the gas introducing hole (8) of the holder (1), and the compressor connecting portion (12). The gas supply hole (12a) and the gas introduction hole (8) are communicated, and gas is forcibly supplied to a portion where the diameter expansion starts. The microbubble generator according to claim 6, wherein a nozzle tip (11) having a nozzle injection port (11a) on the liquid outlet side of the holder (1) and spraying microbubble water in the air is provided at a tip portion. A substantially cylindrical spray adapter (10) provided in a detachable manner is attached, and the diameter φB1 of the liquid channel hole (3a) of the conical portion (2b) and the liquid channel hole of the mixing adapter (5) (6a) The diameter φB2 is equal, and the diameter of the nozzle injection port (11a) is larger than these diameters.

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