JP2008290011A - Fine bubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fine bubble generator which can correctly grasp the generation level of a fine bubble and ensure an appropriate generation level of the fine bubble in compliance with the type of use application. <P>SOLUTION: This fine bubble generator generates the fine bubble by feeding a gas into a liquid flow and comprises a turbidimeter which is arranged on the downstream side from a fine bubble generation part and measures the turbidity of the liquid flow and a control part which controls the generation level of the fine bubble from a value measured by the turbidimeter. The turbidimeter to be used is, for example, of an ultraviolet light irradiation type, a laser irradiation type, an ultrasonic generation type or a light emitting diode type. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fine bubble generator that generates fine bubbles in a liquid fluid. In particular, the present invention relates to a fine bubble generating apparatus capable of controlling the amount of fine bubbles generated in order to adapt to the usage application of fine bubbles.

  In recent years, technologies for generating fine bubbles in a liquid fluid have been used in various technical fields. For example, aquatic organisms using water containing microbubbles in the micro-order or nano-order in water can be used. Techniques for growing, purifying contaminated water, sterilizing, etc. are known. Various devices for generating such a fine air bag have been proposed.

  As a device for generating such fine bubbles, as shown in FIG. 10, it is derived by generating a swirling flow in the liquid and introducing a gas into a negative pressure portion generated in the swirling axis of the swirling flow. An apparatus for generating fine bubbles in a liquid is disclosed. More specifically, a container body having a cylindrical space whose one end is closed with a wall and the other end is open, a gas introduction hole formed in the wall on one end, and an inner wall circle of the cylindrical space In a fine bubble generating device comprising a pressurized liquid inlet port opened in a tangential direction on a part of the peripheral surface, a device having a conical shape or a truncated cone shape in which a wall at one end projects toward the other end. Disclosed is a fine bubble generating device configured to have a space shape of a vertical cross section on one end side to be M-shaped and to derive a swirling gas-liquid mixture containing fine bubbles from an opening of a cylindrical space on the other end side. (For example, refer to Patent Document 1).

JP 2006-116365 A (full text full view)

By the way, in the technique using the fine bubbles as described above, since the suitable amount of fine bubbles generated varies depending on the application, it is desired to appropriately manage the amount of fine bubbles generated.
In particular, because microbubbles float and disappear, or dissolve completely in the liquid and disappear, a part of the liquid fluid is sampled and collected in a liquid particle counter or a microscope. In the method of observing a liquid fluid, there are problems that it is difficult to cope with a change in time during sample collection, or that it is difficult to accurately determine the amount of microbubbles generated in-line.

Also, paying attention to the generation process of fine bubbles, there is a method to control the flow rate, pressure, temperature, etc. of the liquid fluid or gas to be supplied based on the estimated amount of fine bubbles generated. Yes, the amount of fine bubbles actually generated cannot be accurately grasped.
Furthermore, it is possible to monitor the sound when microbubbles are generated with a microphone and control it linearly, but the underwater microphone is expensive and it is also necessary to grasp the wavelength of the surrounding noise, making adjustment difficult. .

Therefore, the inventors of the present invention have made diligent efforts and arranged a turbidimeter downstream of the microbubble generator in the microbubble generator, and determined the amount of microbubbles generated based on the measured value by the turbidimeter. The present inventors have found that such problems can be solved by controlling, and have completed the present invention.
That is, an object of the present invention is to provide a microbubble generator capable of accurately grasping the generation amount of microbubbles and generating an appropriate amount of microbubbles according to usage.

  According to the present invention, there is provided a micro-bubble generating device for supplying gas into a liquid fluid to generate micro-bubbles, and for measuring the turbidity of the liquid fluid arranged downstream of the micro-bubble generating unit. A microbubble generator comprising a turbidimeter and a control unit for controlling the amount of microbubbles generated based on a value measured by the turbidimeter is provided, and the above-described problems are solved. Can be solved.

  Further, in configuring the fine bubble generating device of the present invention, the generating unit is composed of a nozzle unit that guides the liquid fluid supplied with the gas while swirling, and at least the flow channel downstream of the outlet port of the nozzle unit. It is preferable that a transmission part made of a transparent material is provided in part, and the turbidimeter measures the turbidity of the liquid fluid passing through the transmission part.

  Further, in configuring the fine bubble generating device of the present invention, the generating unit is composed of a depressurizing unit that depressurizes the liquid fluid in which the gas is pressurized and dissolved, and is formed in at least a part of the flow path downstream of the depressurizing unit. It is preferable that the turbidimeter is provided with a transmission part made of a transparent material, and the turbidimeter measures the turbidity of the liquid fluid passing through the transmission part.

  In configuring the fine bubble generating apparatus of the present invention, the turbidimeter is preferably any one of an infrared irradiation method, a laser irradiation method, an ultrasonic wave generation method, and a light emitting diode method.

  Further, in configuring the fine bubble generating device of the present invention, the control unit is at least one of the flow rate of liquid fluid, the pressure of liquid fluid, the temperature of liquid fluid, the amount of gas, the pressure of gas, or the temperature of gas. It is preferable to control the generation amount of fine bubbles by adjusting one.

  In configuring the fine bubble generating device of the present invention, the control unit stores in advance the turbidity or solid concentration of the liquid fluid before the gas is supplied, and supplies the gas from the derived turbidity of the liquid fluid. It is preferable to control the generation amount of fine bubbles based on a value obtained by subtracting one or both of the turbidity and the solid concentration of the liquid fluid before being applied.

  According to the fine bubble generator of the present invention, the generation degree of fine bubbles is accurately grasped from the turbidity of the liquid fluid measured by a simple turbidimeter, and the amount of fine bubbles generated is controlled based on the measurement result. Will be able to. Therefore, the generation amount of fine bubbles can be appropriately managed according to the usage application of the fine bubbles.

  Moreover, in the microbubble generator of the present invention, by setting a part of the flow path downstream of the outlet of the nozzle part that generates the swirl flow as a permeation part, and measuring the liquid fluid that passes through the permeation part The turbidity of the liquid fluid can be measured immediately after the generation of the fine bubbles without disposing the turbidimeter in the liquid fluid. Therefore, an expensive turbidimeter is not required, and the generation degree of fine bubbles can be accurately grasped.

  Further, in the microbubble generator of the present invention, a turbidimeter can be used by setting a part of the flow path downstream of the liquid fluid decompression part as a permeation part and the liquid fluid passing through the permeation part as a measurement object. It is possible to measure the turbidity of the liquid fluid immediately after the generation of the fine bubbles without being arranged in the liquid fluid. Therefore, an expensive turbidimeter is not required, and the generation degree of fine bubbles can be accurately grasped.

  Moreover, in the fine bubble generating apparatus of the present invention, by using a predetermined turbidimeter, the turbidity of the liquid fluid can be measured without disposing the turbidimeter in the liquid fluid.

  Moreover, in the fine bubble generating apparatus of the present invention, the amount of fine bubbles generated can be accurately controlled by controlling the predetermined control element by the control unit.

  Further, in the fine bubble generating apparatus of the present invention, the amount of fine bubbles that is optimal for the application is controlled by controlling the amount of fine bubbles generated in consideration of the turbidity and solid concentration of the liquid fluid before the gas is supplied. Can be generated with higher accuracy.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments relating to a fine bubble generator of the present invention and a cleaning device, a showering device and a water tank using the fine bubble generator of the present invention will be specifically described below with reference to the drawings as appropriate. However, this embodiment shows one aspect of the present invention and does not limit the present invention, and can be arbitrarily changed within the scope of the present invention.
In addition, in each figure, what has attached | subjected the same code | symbol has shown the same member, and description is abbreviate | omitted suitably.

[First Embodiment]
A first embodiment according to the present invention includes a pumping unit that pumps a liquid fluid, a nozzle unit that guides the liquid fluid while swirling, and a gas supply unit that supplies gas into the liquid fluid within the nozzle unit. This is a swirling flow type fine bubble generator.

1. Overall Configuration FIG. 1 is a diagram schematically showing the configuration of a microbubble generator 100 according to this embodiment.
The microbubble generator 100 is connected to a liquid fluid supply pipe 57, connected to a pump 103 that pumps the liquid fluid and a liquid feeding pipe 55, and leads out the liquid fluid pumped from the pump 103 into the liquid feeding pipe 55. And a swirl flow generation nozzle 10. The pump 103 and the swirl flow generating nozzle 10 are connected by a liquid flow path 107. In addition, a gas supply device 120 for supplying gas to the liquid fluid in the swirl flow generation nozzle 10 is connected to the swirl flow generation nozzle 10.

Further, the liquid fluid supply pipe 57 on the upstream side of the pump 103 is provided with a filter 111, a solenoid valve 113, and a pre-purge tank 115. The filter 111 is used for collecting and removing foreign substances in the liquid fluid sent toward the pump 103. Further, as the electromagnetic valve 113, for example, a known electromagnetic proportional control valve or on / off valve is used, and the flow rate of the liquid fluid pumped by the pump 103 can be adjusted by controlling the opening degree and duty ratio. ing.
Furthermore, the pre-purge tank 115 is a tank for removing gas in the liquid fluid. A heating means or a cooling means 59 is attached to the pre-purge tank 115 so that the temperature of the liquid fluid can be adjusted.

In addition, a relief valve 89 for discharging the gas in the liquid fluid sent to the swirl flow generation nozzle 10 to the outside is connected to the liquid flow path 107 between the pump 103 and the swirl flow generation nozzle 10. Then, the relief valve 89 is opened at an appropriate timing so that the gas accumulated in the liquid channel 107 is discharged. In this way, by discharging the gas in the liquid fluid, it is possible to prevent a large bubble such as an air pool from being derived from the swirl flow generation nozzle 10 and to stabilize the fine bubble with a suppressed variation in diameter. Can be generated.
By making the mounting position of the relief valve 89 as close as possible to the swirling flow generating nozzle 10, the distance from the relief valve 89 to the swirling flow generating nozzle 10 is shortened, and the retentive valve 89 stays in the swirling flow generating nozzle at an initial stage. Gas amount to be reduced.

  In addition, the liquid supply pipe 55 connected to the swirl flow generation nozzle 10 is configured as a transmission part 55 a made of a transparent resin material or the like in the vicinity of the outlet of the swirl flow generation nozzle 10. The liquid fluid led out and passing through the liquid feeding pipe 55 can be visually recognized from the outside.

  Further, the microbubble generator 100 is provided with a turbidimeter 51 and a control control unit 53. Based on the turbidity of the liquid fluid measured by the turbidimeter 51, the above-mentioned pump 103, electromagnetic valve 113, heating The control signal of each control element including the means or the cooling means 59, the relief valve 89, etc. is output. The output control signal is a value set so that an amount of fine bubbles corresponding to the usage application of the fine bubbles is generated.

2. Gas supply device The gas supply device 120 adjusts the amount of gas to be supplied, a gas generator 123 that generates a gas to be mixed with the liquid fluid in the swirl flow generation nozzle 10, a pressure reducing valve 125 that depressurizes the generated gas, and a gas supply device. The electromagnetic valve 127 for cooling and the cooling device 129 for cooling gas are provided, and are connected by the gas flow path 121. The end of the gas flow path 121 is connected to the swirl flow generation nozzle 10.

  Among these, the gas generator 123 is, for example, a known oxygen generator or ozone generator, and can be appropriately selected according to the use of the liquid containing the fine bubbles generated by the fine bubble generator 100. In order to enhance the purification, sterilization, and disinfection effects, it is effective to provide an oxygen generator and an ozone generator. A plurality of gas generators can be used in combination. When air is used as the gas to be mixed in the liquid fluid, a compressor is used as the gas generator 123, or the end of the gas flow path 121 is opened to the atmosphere, and the end (air intake portion) is used. It is configured to be able to take in the atmosphere.

The pressure reducing valve 125 is a valve for reducing the pressure of the high-pressure gas generated by the gas generator 123 and supplying it, and may be omitted if the gas generated by the gas generator 123 is not high pressure. it can. Furthermore, the solenoid valve 127 is composed of, for example, an on / off valve, and can control the opening and closing of the solenoid valve depending on whether or not voltage is supplied, thereby adjusting the amount of gas to be supplied.
The cooling device 129 is used to cool the gas supplied into the liquid fluid, and the temperature of the gas can be kept sufficiently lower than the vapor pressure of the liquid fluid so that the influence of the vapor pressure of the liquid fluid can be ignored. It has become. The gas cooling device 129 can be omitted depending on the use environment and use conditions.

  When an ozone generator is used as the gas generator 123, a pre-purge tank 131 is disposed between the ozone generator 123A of the gas supply device 120A and the pressure reducing valve 125 as shown in FIG. It is preferable to connect an ozone killer device 135 to 131 through an electromagnetic valve 133. If comprised in this way, it can prevent that high concentration ozone is discharge | released in air | atmosphere.

  Control signals are output from the above-described control control unit 53 to drive the electromagnetic valves, pressure reducing valves, cooling devices, and the like that constitute these gas supply devices 120.

3. Swirl Flow Generation Nozzle FIG. 3 shows a configuration example of a swirl flow generation nozzle provided in the fine bubble generation device of the present embodiment. 3A is a perspective view of the swirling flow generating nozzle 10, FIG. 3B is a cross-sectional view of the swirling flow generating nozzle 10 cut along the axial direction, and FIG. It is sectional drawing which cut | disconnected the swirl | vortex flow production | generation nozzle 10 along the direction orthogonal to an axial direction in the position where was formed. Moreover, the housing | casing 11 and the cylindrical member 21 which comprise the rotational flow production | generation nozzle 10 of FIG. 3 are shown in FIG.4 and FIG.5, respectively.

  As shown in FIGS. 3 to 5, the swirl flow generation nozzle 10 includes a housing 11 and a cylindrical member 21. The casing 11 includes a cylindrical space portion 11a having one end opened, and the fluid introduction path 11b opened to face the cylindrical space 11a is opposite to the opened end. A gas inlet 165 provided at the end on the side is provided. The cylindrical member 21 is disposed in the cylindrical space portion 11a of the housing 11, and is provided with a cylindrical space portion 21a having both ends opened and a hole portion 23 opened in the peripheral wall of the cylindrical space portion 21a.

  The housing 11 used in the present embodiment includes a main body 13 and a lid 12. The main body 13 is a cylindrical member having a projecting portion 14 projecting from the outer peripheral surface and having one end opened, and includes a cylindrical space portion 11a in which the cylindrical member 21 is accommodated. Further, the projecting portion 14 is provided with a fluid introduction path 11b facing the inner peripheral surface of the cylindrical space portion 11a. The fluid introduction path 11b is formed such that the arrangement direction is shifted from the axial center of the cylindrical space portion 11a (see FIG. 3C).

  The lid portion 12 is attached to an end portion of the main body portion 13 where the cylindrical space portion 11a is opened. An opening 15 smaller than the diameter of the cylindrical space portion 11a of the main body portion 13 is provided, and the cylindrical member 21 is inserted. It has come to be. Further, a concave portion 16 that matches the outer shape of the cylindrical member 21 is provided on the inner surface of the end portion of the main body portion 13 on which the lid portion 12 is not mounted, so that the cylindrical member 21 is inserted. A gas introduction port 165 is provided at an end portion on which the lid portion 12 is not mounted, and a gas flow path 121 communicating with the gas supply device 120 is connected thereto.

  A check valve 169 is provided in the gas introduction port 165 communicating with the gas flow path 121. The check valve 169 is normally closed, and when a high-speed swirling flow is generated in the swirling flow generating nozzle 10, the check valve 169 is opened by a negative pressure generated in the center portion of the swirling to introduce gas. Yes. The introduced gas appears as a gas phase in the central portion of the swirling flow, and becomes fine bubbles when it is led out from the swirling flow generating nozzle 10.

In addition, the cylindrical member 21 includes a cylindrical space portion 21a that opens at both ends, and one or a plurality of holes (four in FIG. 5) 23 that open in the peripheral wall of the cylindrical space portion 21a. In 11 cylindrical space portions 11a, they are arranged and fixed around a predetermined gap S. This gap S functions as a passage for the introduced liquid fluid.
As described above, in the swirl flow generating nozzle 10 of the present embodiment, the cylindrical member 21 is inserted into the cylindrical space portion 11a of the main body 13, and the opening 15 and the main body of the lid 12 mounted on one end side. The cylindrical member 21 is held and fixed by the recess 16 in the inside 13.

  The material constituting these casings and cylindrical members is not particularly limited, and examples include metal materials such as iron alloys, aluminum alloys, and zinc alloys or non-ferrous metal materials, sintered bodies such as ceramics, plastics, Polyvinyl chloride (PVC), thermoplastic polyolefin resin (TPO), thermoplastic polyurethane resin (TPU), polypropylene (PP), acrylic-butadiene-styrene resin (ABS), polycarbonate (PC), polyethylene (PE), fluororesin Various materials such as resin materials such as wood, recycled raw materials such as wood, waste plastic and waste wood are listed.

For example, when the casing and the cylindrical member are made of a transparent resin material, the inside can be easily confirmed, and the housing and the cylindrical member can be used while confirming the generation state of the swirling flow.
However, in order to prevent the composition of the introduced liquid fluid from changing or to efficiently generate a high-speed swirling flow, the wettability with the introducing liquid fluid and the degree of swirling flow to be generated are considered. Furthermore, it is preferable to select and use a material that does not easily react with the liquid fluid or the supplied gas.

  These swirl flow generation nozzles illustrated in FIGS. 3 to 5 are merely one configuration example, and are not limited to the above-described configuration, and various modifications are possible. For example, the type of liquid fluid or gas is generated such as the outer shape of the casing 11, the number and position of the fluid introduction passages 11 b, the arrangement direction, and the number and position of the holes 23 of the cylindrical member 21 and the arrangement direction. It can be changed according to the mode of the fine bubbles.

4). Turbidimeter and control unit (control control unit)
The turbidimeter 51 is used for measuring the turbidity of the liquid fluid derived from the swirl flow generation nozzle 10 and grasping the degree of generation of fine bubbles in the liquid fluid. Information on the turbidity of the liquid fluid measured by the turbidimeter 51 is transmitted to the control unit 53 as a turbidity signal. The control control unit 53 performs feedback control of the degree of occurrence of fine bubbles based on the received turbidity information.

  That is, when the measured turbidity value of the liquid fluid is larger than the turbidity value corresponding to the target generation amount of fine bubbles, the generation amount of fine bubbles is larger than the target generation amount. The control signal is output so that the amount of fine bubbles generated is reduced. On the other hand, if the measured turbidity value of the liquid fluid is smaller than the turbidity value corresponding to the target generation amount of fine bubbles, the generation amount of fine bubbles is smaller than the target generation amount. The control signal is output so that the amount of generated fine bubbles is increased.

  The control signal output from the control unit 53 to increase or decrease the amount of generated fine bubbles is a pump 103 or electromagnetic valve 113 capable of adjusting the pressure, flow rate and temperature of the liquid fluid, heating means or cooling means 59, or The pressure is output to the pressure reducing valve 125, the electromagnetic valve 127, and the cooling device 129 that can adjust the pressure, flow rate, and temperature of the gas. Each of these control elements is a factor that affects the amount of fine bubbles generated, and the amount of fine bubbles generated can be increased or decreased by controlling one or more of these factors.

  The turbidimeter 51 is, for example, an infrared irradiation method, a laser irradiation method, an ultrasonic irradiation method, or a light emitting diode type turbidimeter, and the turbidimeter 51 is not immersed and disposed in a liquid fluid. The turbidity of the liquid fluid passing through the transmission part 55a made of a transparent material provided in a part of the liquid feeding pipe 55 can be measured from the outside. These turbidimeters 51 are less expensive than liquid particle counters, microscopes, underwater microphones, and the like, and can reduce the production cost of the microbubble generator 100.

  The turbidity measurement unit 51 measures the turbidity of the liquid fluid at the downstream side of the generation point of the fine bubbles in the liquid fluid derived from the swirl flow generation nozzle 10 and as much as possible. It is preferable that the position be close to the generation point. Since the fine bubbles may rise or disappear with complete lapse of time with time, if they are measured at such positions, the generated amount immediately after derivation can be accurately grasped. However, if measurement is performed in a state where the fine bubbles are somewhat stabilized, it is preferable to measure at a position slightly shifted downstream from the generation point.

  The control control unit 53 stores the turbidity and solid concentration of the liquid fluid to be supplied in advance, and the turbidity of the liquid fluid before the gas is supplied from the turbidity value measured by the turbidimeter 51. The degree of turbidity increased by the generation of fine bubbles can be accurately obtained by subtracting either or both of the temperature and the solid concentration. That is, even when the liquid fluid itself is turbid or contains a solid component, it is possible to measure the increase in turbidity due to the generation of fine bubbles, and the amount of fine bubbles generated can be accurately measured. Controlled.

  In the configuration of the microbubble generator 100 of the present embodiment, since the swirl flow generation nozzle 10 is connected to the liquid feeding pipe 55, a part of the liquid feeding pipe 55 is used as a measurement point of the turbidity of the liquid fluid. However, as shown in FIG. 6, the liquid fluid is led directly from the swirl flow generation nozzle 10 into the liquid tank 101 without using such a liquid feeding pipe. In the case of the fine bubble generator 100 ′ configured to be used, the turbidimeter 51 is arranged so that the turbidity of the liquid fluid can be measured from the outside of the liquid tank 101 in the vicinity of the outlet of the swirl flow generation nozzle 10. .

5. Hereinafter, an example of the operation of the fine bubble generator 10 shown in FIG. 1 will be described.
First, by operating the pump 103, the liquid fluid sent from the liquid fluid supply pipe 57 is pumped to the swirl flow generation nozzle 10 side. At this time, foreign matters in the liquid fluid sent to the pump 103 are collected by the filter 111 and gas components are removed in the pre-purge tank 115. Further, the flow rate of the liquid fluid to be sent is adjusted by the output of the pump 103 and the electromagnetic valve 113 on the downstream side of the filter 111. At the same time, the gas supply device 120 is operated.

  The liquid fluid that has been pumped and introduced into the swirling flow generation nozzle 10 passes through the hole 23 and is led out from the swirling flow generation nozzle 10 as a high-speed swirling flow. At this time, since a negative pressure is generated in the swirling center of the high-speed swirling flow, a check valve provided in the gas inlet 165 provided at the end opposite to the end from which the liquid fluid is led (see FIG. (Not shown) is opened and gas is sucked into the swivel center. Since the liquid fluid moves toward the outer periphery of the swirl by centrifugal force, a gas phase is generated at the center of the high-speed swirl flow.

  If the swirl flow is generated from the swirl flow generating nozzle 10 in such a state, the swirl is suddenly weakened, and the gas phase present in the swirl center is cut into fine bubbles and released into the liquid fluid. become. At this time, with the swirling flow generating nozzle 10 of the present embodiment, the difference in swirling speed before and after being derived from the nozzle becomes remarkably large, so that fine bubbles with suppressed variation in diameter can be generated efficiently. Can do.

  Here, the liquid fluid led out from the swirl flow generation nozzle 10 into the liquid feeding pipe 55 and containing fine bubbles is obtained by using the turbidimeter 51 in the permeation portion 55 a provided in the liquid feeding pipe 55. Turbidity is measured. The measured turbidity value is sent to the control control unit 53 as a turbidity signal, and the value obtained by subtracting the turbidity or solid concentration of the liquid fluid stored in advance is compared with the turbidity corresponding to the target generation amount. Done. Then, the control control unit 53 determines whether the value obtained by subtracting the turbidity or solid concentration of the liquid fluid from the value measured by the turbidimeter 51 matches the target value of turbidity. The control signal is output to the pressure reducing valve 125, the heating means or the cooling means 59, 129, and the generation amount of fine bubbles is controlled. As a result, it is possible to generate an optimal amount of fine bubbles according to the usage application of the fine bubbles.

[Second Embodiment]
A second embodiment according to the present invention includes a gas supply unit that supplies a gas into a liquid fluid that flows through a flow path, a pumping unit that pumps a gas-liquid mixed fluid mixed with the gas, and a gas in the liquid fluid. It is a pressure dissolution type fine bubble generator provided with a dissolving part for dissolving in a gas and a nozzle part for deriving a liquid fluid in which a gas is dissolved.

1. Overall Configuration FIG. 7 is a diagram schematically showing the configuration of the microbubble generator 200 according to the present embodiment.
The microbubble generator 200 is connected to a liquid fluid supply pipe 257, connected to a pump 203 that pumps the liquid fluid, a dissolution tank 205 into which the liquid fluid pumped by the pump 203 flows, and a liquid feed pipe 255. And a swirl flow generating nozzle 30 for leading the liquid fluid to be pumped into the liquid feed pipe 255. The pump 203, the dissolution tank 205, and the swirl flow generation nozzle 30 are connected by liquid flow paths 207c to 207e. Among these, the swirl flow generation nozzle 30 is provided with a hole (43 in FIG. 8) whose flow path cross-sectional area is reduced, and the liquid flow paths 207c to 207c between the pump 203 and the swirl flow generation nozzle 30 are provided. 207e is set to a high pressure. In addition, a gas supply device 220 for supplying gas into the liquid fluid is connected to the liquid fluid supply pipe 257 on the upstream side of the pump 203.

Further, a filter 211, a solenoid valve 213, and a pre-purge tank 215 are provided in the liquid fluid supply pipe 257 on the upstream side of the pump 203 on the upstream side of the connection location of the gas flow path 221. The filter 211 is used for collecting and removing foreign substances in the liquid fluid sent toward the pump 203. The electromagnetic valve 213 is, for example, a known electromagnetic proportional control valve or on / off valve, and the flow rate of the liquid fluid pumped by the pump 203 can be adjusted by controlling the opening degree and duty ratio. ing.
Further, the pre-purge tank 215 is a tank for removing the gas in the liquid fluid before the gas supplied from the gas supply device 220 is mixed, and the pre-purge tank 215 includes a circulation channel described later. 209 is connected. The pre-purge tank 215 is provided with heating means or cooling means 259 so that the temperature of the liquid fluid can be adjusted.

Further, a three-way valve 217 is provided between the liquid flow paths 207 d and 207 e between the dissolution tank 205 and the swirl flow generation nozzle 30, and the flow of the liquid fluid is transferred to the liquid flow path 207 e to the swirl flow generation nozzle 30. And the circulation channel 209 side that leads to the pre-purge tank 215. The three-way valve 217 can be, for example, an on / off valve that is controlled to open and close depending on whether or not voltage is supplied. By providing such a three-way valve 217, the liquid fluid is circulated through the circulation flow path 209 without being supplied to the swirl flow generation nozzle 30 until the gas component is dissolved to a level close to the saturation state, and is saturated. It can be controlled to supply to the swirl flow generating nozzle 30 side when the gas component is dissolved to a level close to. Therefore, it is possible to stably generate microbubbles with reduced diameter variation from the initial stage of derivation from the swirl flow generating nozzle 30.
In addition, by making the attachment position of the three-way valve 217 as close as possible to the swirl flow generation nozzle 30, the amount of gas staying in the swirl flow generation nozzle at an initial stage can be reduced.

  Further, the microbubble generator 200 is provided with a turbidimeter 251 and a control control unit 253. Based on the turbidity of the liquid fluid measured by the turbidimeter 251, the above-mentioned pump 203, electromagnetic valve 213, heating The control signal of each control element including the means or the cooling means 259, the three-way valve 217, etc. is output. The output control signal is a value set so that an amount of fine bubbles corresponding to the usage application of the fine bubbles is generated.

2. Gas supply device The configuration of the gas supply device 220 used in the fine bubble generation device 200 of the present embodiment is similar to the gas supply device described in the first embodiment, and generates a gas to be mixed with the liquid fluid. A device 223, a pressure reducing valve 225 for reducing the generated gas, an electromagnetic valve 227 for adjusting the amount of gas to be supplied, and a cooling device 229 for cooling the gas. It is connected. The end of the gas flow path 221 is connected to the liquid fluid supply pipe 257. Since the configuration of the gas supply device 220 can be the same as that of the gas supply device of the first embodiment, a description thereof is omitted here.
Note that the control valve 225, the electromagnetic valve 227, and the cooling device 229, which are components of the gas supply device 220 of the present embodiment, are also driven by outputting a control signal from the control control unit 253 described above. .

3. Dissolution tank The dissolution tank 205 is provided as a location for holding the liquid fluid whose pressure has been increased between the pump 203 and the swirling flow generating nozzle 30 and for dissolving the gas in the liquid fluid mixed with the gas.
Further, for example, as shown in FIG. 8, the dissolution tank 205 includes a tapered container body 81 whose cross-sectional area is reduced downward, and an arrangement direction is shifted from the center on the upper wall surface of the container body 81. A liquid fluid inlet 83 provided and a liquid fluid outlet 85 provided at the bottom of the container body 81 may be provided. The dissolution tank 205 uses a so-called cyclone system, and the liquid fluid moving in the dissolution tank 205 is swirled, so that the dissolution efficiency of the mixed gas can be remarkably increased.

Further, a bent portion 86 that bends in a right angle direction is provided at the outlet 85 of the liquid fluid from the dissolution tank 205. Since the liquid fluid collides with the inner surface of the liquid flow path at the bent portion 86, the gas component dissolution efficiency is increased.
In order to improve the dissolution efficiency in this way, the collision of the liquid fluid can be achieved by providing a collision plate on a part of the wall surface in the dissolution tank or by providing a rectangular area in the horizontal cross section of the container body. A location can also be formed.
In addition, you may make it the flow direction of a liquid fluid flow, turning from the lower part to the upper part.

  Further, an undissolved gas retaining portion 87 is formed at the center of the upper portion of the dissolution tank 205, and a relief valve 289 for discharging the undissolved gas to the outside of the dissolution tank is provided in the retaining portion 87. It is connected. The dissolution tank 205 is provided with a level sensor 91 for monitoring the water level of the liquid in the tank, and is used to discharge gas from the relief valve 289 when the upper surface position becomes a predetermined level or less. . In this way, by discharging the undissolved gas, it is possible to prevent a large bubble such as an air pool from being derived from the swirl flow generation nozzle 10 and to stably remove the fine bubbles with a suppressed variation in diameter. Can be generated.

Further, as shown in FIG. 7, the gas discharge passage 208 connected to the relief valve 289 is connected to the upstream side of the pump 203, and the discharged gas is supplied again into the liquid fluid. Even if the liquid is mixed when recovered from the dissolution tank 205 by circulating the undissolved gas inside without releasing it to the outside in this way, water leaks outside the apparatus. The risk of causing the problem is eliminated.
In addition to this, water leakage to the outside of the apparatus can be prevented by connecting the gas discharge passage 208 to the tank 201 or the pre-purge tank 215.

  Further, when the water level of the liquid fluid in the dissolution tank 205 decreases and the undissolved gas is recovered and returned to the liquid fluid again, the electromagnetic valve 227 of the gas supply device 220 is closed at the same time, The amount of gas to be supplied is limited. Therefore, after undissolved gas appears, the amount of gas supplied into the liquid fluid is adjusted so that undissolved components are not generated.

  Further, in the configuration of the fine bubble generating device 200 shown in FIG. 7, the melting tank 205 is also provided with a cooling device 240 so that the gas melting efficiency in the melting tank 205 can be increased. This cooling device can be omitted depending on the type of gas, the usage environment, and the purpose of the generated bubbles.

4). Swirl Flow Generation Nozzle FIG. 9 shows a configuration example of the swirl flow generation nozzle 30 provided in the fine bubble generating device 200 of the present embodiment. FIG. 9A is a perspective view of the swirl flow generation nozzle 30, FIG. 9B is a cross-sectional view of the swirl flow generation nozzle 30 cut along the axial direction, and FIG. It is sectional drawing which cut | disconnected the swirl flow production | generation nozzle 30 along the direction orthogonal to an axial direction in the position where was formed. The form of the swirl flow generation nozzle 30 is different from the swirl flow generation nozzle of the first embodiment in that the gas inlet is not provided at the end opposite to the opened end of the housing 31. In other respects, the same configuration can be adopted.

  On the other hand, in the swirl flow generating nozzle 30 of the present embodiment, the casing 31 and the cylindrical member 41 are both made of a transparent resin material or the like, and the liquid fluid in which the gas component is pressurized and dissolved is rapidly decompressed. The liquid fluid that passes through the downstream side (inside the cylindrical member 41) from the hole 43 of the cylindrical member 41 where fine bubbles are generated can be visually recognized from the outside.

  In the microbubble generator of this embodiment, the same configuration as the swirl flow generation nozzle used in the first embodiment shown in FIG. 3 is used, and gas is also supplied to the swirl flow generation nozzle. It can also be set as the fine bubble generator which used the pressurization melt | dissolution type | formula and the swirl | flow type.

5. Turbidimeter and control unit (control control unit)
The turbidimeter 251 and the control unit 253 provided in the microbubble generator 200 of the present embodiment can be basically the same as those described in the first embodiment. However, in this embodiment, the measurement location where the turbidity of the liquid fluid is measured by the turbidimeter 251 is reduced in pressure by passing through the hole 43 provided in the cylindrical member 41 of the swirl flow generation nozzle 30, and the liquid fluid The inside of the cylindrical member 41 in which fine bubbles are generated.

6). Hereinafter, an example of the operation of the microbubble generator 200 shown in FIG. 7 will be described.
First, among the three-way valve 217 between the dissolution tank 201 and the swirl flow generation nozzle 30, the swirl flow generation nozzle 30 side is closed while the circulation flow path 209 side is opened. By operating the pump 203 in this state, the liquid fluid sent from the liquid fluid supply pipe 257 is pumped and supplied to the circulation channel 209 side. At this time, foreign matters in the liquid fluid are collected by the filter 211 and the gas component is removed in the pre-purge tank 215. The flow rate of the liquid fluid is adjusted by the output of the pump 203 and the electromagnetic valve 213 on the downstream side of the filter 211.

  After the predetermined time has elapsed, the pre-purge tank 215, the dissolution tank 205, the liquid channels 207c to 207d, and the circulation channel 209 are filled with the liquid fluid, so that the solenoid valve 213 on the downstream side of the filter 211 is gradually controlled. Thus, the flow rate of the liquid fluid fed from the liquid fluid supply pipe 257 is decreased. As a result, the liquid fluid is circulated in the closed path via the circulation channel 209. In addition, the liquid fluid circulating in the closed path is held at a high pressure.

  In this state, the gas supply device 220 is operated to supply gas into the liquid fluid on the upstream side of the pump 203. Then, the liquid fluid mixed with gas is pumped by the pump 203 and introduced into the dissolution tank 205. In the dissolution tank 205, the liquid fluid mixed with the gas is swirled so that the gas component is efficiently dissolved in the liquid fluid, while the surplus gas is undissolved and remains in the upper part of the dissolution tank 205. (Not shown). As the amount of the staying gas increases, the water level of the liquid fluid in the dissolution tank 205 decreases. The liquid level of the liquid fluid is monitored by a level sensor (not shown). When the liquid level falls below a predetermined level, the relief valve 289 connected to the staying portion is opened, and the undissolved gas is removed from the upstream side of the pump 203. At the same time, the gas supply amount by the gas supply device 220 is decreased.

  In this way, after adjusting the gas supply amount, the liquid fluid that has passed through the dissolution tank 205 closes the circulation channel 209 side of the three-way valve 217 after the gas component dissolution amount is saturated. On the other hand, the swirl flow generating nozzle 30 side is opened. At the same time, the electromagnetic valve 213 on the downstream side of the filter 211 is also opened, and the pump 203 and the electromagnetic valve 213 are controlled so that the pressure in the liquid channel is kept constant.

  The liquid fluid in which the gas component is dissolved and saturated flows into the swirl flow generation nozzle 30 and passes through a hole (not shown) whose flow path cross-sectional area is reduced, and is rapidly depressurized and dissolved. Gas components appear as fine bubbles. Moreover, since it is derived | led-out as a high-speed swirl | vortex flow simultaneously at this time, the fine bubble which was made into the fine bubble efficiently and the dispersion | variation in the diameter was suppressed is produced | generated.

  Here, the liquid fluid that has passed through the hole 43 provided in the cylindrical member 41 of the swirl flow generating nozzle 30 and contained fine bubbles passes the turbidimeter 251 while passing through the inside of the cylindrical member 41. Using it, turbidity is measured. The measured turbidity value is sent to the control unit 253 as a turbidity signal, and the value obtained by subtracting the turbidity or solid concentration of the liquid fluid stored in advance is compared with the turbidity corresponding to the target generation amount. Done. Then, the control control unit 253 controls the pump 203 and the solenoid valves 213 and 227 so that the value obtained by subtracting the turbidity or solid concentration of the liquid fluid from the value measured by the turbidimeter 251 matches the target value of turbidity. The control signal is output to the pressure reducing valve 225, the heating means or the cooling means 229, 240, and 259, and the amount of generated fine bubbles is controlled. As a result, it is possible to generate an optimal amount of fine bubbles according to the usage application of the fine bubbles.

  As described above, according to the present invention, the generation amount of fine bubbles can be managed so as to be an appropriate amount according to the usage application of the fine bubbles. Therefore, the fine bubble generating device of the present invention is a hand washing device used in an environment where high hygiene management is required, such as a food processing site or a hospital, or a showering device used when washing hair at a beauty salon, Equipped with a ginger (aquarium) or the like, it is possible to further enhance the effects of growing, sterilizing, disinfecting, and cleaning raw plants.

It is a schematic diagram for demonstrating the structure of the swirling flow type fine bubble generator concerning 1st Embodiment. It is a figure which shows the structure of the fine bubble generator provided with the ozone generator and the ozone killer apparatus. It is a figure for demonstrating the structure of the rotational flow production | generation nozzle of 1st Embodiment. It is a figure which shows the housing | casing which comprises the turning flow production | generation nozzle of 1st Embodiment. It is a figure which shows the cylindrical member which comprises the turning flow production | generation nozzle of 1st Embodiment. It is a figure which shows the structural example of the microbubble generator of the structure which guide | induces a liquid fluid in a liquid tank from a swirl flow production | generation nozzle. It is a schematic diagram for demonstrating the structure of the pressurization dissolution type fine bubble generator concerning 2nd Embodiment. It is a figure which shows the structural example of a dissolution tank. It is a figure for demonstrating the structure of the rotational flow production | generation nozzle of 2nd Embodiment. It is a figure which shows the structure of the conventional fine bubble generator.

Explanation of symbols

10: swirl flow generation nozzle, 11: housing, 11a: cylindrical space part, 11b: fluid introduction path, 12: lid part, 13: main body part, 19: introduction port, 21: cylindrical member, 21a: cylindrical space part, 23: Hole, 30: Swirl flow generating nozzle, 31: Housing, 31a: Cylindrical space, 31b: Fluid introduction path, 32: Lid, 33: Main body, 39: Inlet, 41: Cylindrical member, 41a : Cylindrical space part, 43: Hole part, 51: Turbidimeter, 53: Control part (control control unit), 55: Liquid feeding pipe, 55a: Permeation part, 57: Liquid fluid supply pipe, 59: Heating means (cooling) Means), 81: Container body, 83: Inlet, 85: Outlet, 86: Bent part, 87: Retention part, 89: Relief valve, 91: Level sensor, 100: Fine bubble generator, 101: Liquid tank, 103: Pump, 107: Liquid flow path, 111: Filter 113: Solenoid valve, 115: Prepurge tank, 119: Pressure sensor, 120 / 120A: Gas supply device, 121: Gas flow path, 123 / 123A: Gas generator, 125: Pressure reducing valve, 127: Solenoid valve, 129: Cooling Device: 131: Prepurge tank, 133: Solenoid valve, 135: Ozone killer device, 140: Heating means (cooling means), 165: Gas inlet, 169: Check valve, 251: Turbidimeter, 253: Control unit ( 200: fine bubble generator, 203: pump, 205: dissolution tank, 207c, 207d, 207e: liquid flow path, 208: gas discharge passage, 209: circulation flow path, 211: filter, 213: electromagnetic Valve, 215: pre-purge tank, 217: three-way valve, 219a and 219b: pressure sensor, 220: gas supply device, 2 1: Gas flow path, 223: Gas generator, 225: Pressure reducing valve, 227: Solenoid valve, 229: Cooling device, 231: Prepurge tank, 240: Cooling device, 255: Liquid feeding pipe, 255a: Permeation section, 257: Liquid fluid supply piping, 259: heating means or cooling means, 289: relief valve

Claims (6)

In a fine bubble generator that generates gas by supplying gas into a liquid fluid,
A turbidimeter for measuring the turbidity of the liquid fluid disposed on the downstream side of the generation portion of the fine bubbles, and a generation amount of the fine bubbles based on a value measured by the turbidimeter And a control unit for controlling the fine bubble generating device.   The generating portion is composed of a nozzle portion that guides the liquid fluid supplied with the gas while swirling, and is configured of a transparent material in at least a part of the flow path downstream from the outlet port of the nozzle portion. The fine bubble generating apparatus according to claim 1, further comprising a transmission unit, wherein the turbidimeter measures the turbidity of the liquid fluid passing through the transmission unit.   The generating unit includes a depressurizing unit that depressurizes the liquid fluid in which the gas is dissolved under pressure, and a transmission unit configured of a transparent material in at least a part of the flow path downstream of the depressurizing unit. The fine bubble generator according to claim 1, wherein the turbidimeter measures turbidity of the liquid fluid passing through the transmission part.   The turbidimeter is any one of an infrared irradiation method, a laser irradiation method, an ultrasonic wave generation method, and a light emitting diode method, according to any one of claims 1 to 3. Fine bubble generator.   The control unit adjusts at least one of the flow rate of the liquid fluid, the pressure of the liquid fluid, the temperature of the liquid fluid, the amount of the gas, the pressure of the gas, or the temperature of the gas. The fine bubble generating device according to any one of claims 1 to 4, wherein a generation amount of the fine bubbles is controlled.   The controller stores in advance the turbidity or solid concentration of the liquid fluid before the gas is supplied, and the gas before the gas is supplied from the turbidity of the liquid fluid that has generated the fine bubbles. The fine amount according to any one of claims 1 to 5, wherein the generation amount of the fine bubbles is controlled based on a value obtained by subtracting one of turbidity and solid concentration of the liquid fluid. Bubble generator.

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