JPH08112587A - Fine air bubble generator - Google Patents

Abstract

PURPOSE: To reduce the size over the entire part of a device by providing the device with a gas-liquid mixing means for completely dissolving gas into liquid and a pump means, etc., for which a diaphragm or tube pump for discharging the liquid dissolved therein with the gas from a discharge valve at the front end of a liquid discharge pipe by a prescribed pressure. CONSTITUTION: An original liquid is pumped up from a section A to be treated by driving the pump means 2 for which the diaphragm pump 20 or tube pump is used in order to purify the water of rivers, lakes, ponds, etc., by using a fine air bubble generator. The air supplied from an air feeding means 3 is completely dissolved into the original liquid by the gas-liquid mixing means 1 and thereafter, the liquid is sent under pressurization into a pressurized tank 4 and is discharged from the discharge valve 5 into the section A to be treated. The pressure of the pressurized liquid is released as the liquid is discharged into the section A to be treated. The air dissolved in the liquid is expanded and ruptured and the air bubbles B are generated. As a result, the flocs F in the liquid of the section A to be treated are floated and are raked by a net, etc., by which the section A to be treated is purified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine bubble generator, and more particularly to a device for generating fine bubbles in a liquid, which fine bubble generator generates from the device. It is used in a so-called flotation separation method in which air bubbles are adhered to flocs in a liquid and floated to purify rivers, lakes and marshes, and to separate oil and water.

[0002]

2. Description of the Related Art As a conventional purification method by a floating separation method, a coagulant is injected into raw water and stirred in a coagulation reaction tank.
Air is dissolved in the water by using a part of the liquid as pressurized water, and the pressurized water in which the air is dissolved is mixed with the flocculating stirring liquid, and bubbles are attached to the flocs in the liquid to flow into the flotation separation tank. The flocs floating on the water surface were separated here. In the same manner, oil-water separation is also performed by attaching bubbles to oil mixed in water.

The conventional purification method and oil / water separation method by the floating separation method utilize the adhering action to the flocs and oil components by the bubbles generated from the pressurized water in which air is dissolved. The larger the pressure change when the bubble expands and bursts, the higher the pressure change. The smaller the bubble, the larger the pressure change. Further, the dissolved amount of air increases as the pressure of the pressurized water increases. Therefore, the floating effect due to air bubble adhesion, that is,
The purification effect and the oil-water separation effect increase as the pressure of the pressurized water that dissolves air increases.

However, in the conventional floating separation method as described above, when the pressurized water in which air is dissolved is already mixed with the coagulation stirring liquid, the pressure is already reduced and the dissolved amount of air is reduced, and The bubbles were expanded due to the pressure decrease, and the pressure change at the time of the expansion and the burst of the bubbles in the coagulation stirring tank was small, and the sufficient floating action due to the adhesion of the bubbles was not obtained. Moreover, since the apparatus used for the conventional flotation method is a closed system that requires the flocculation reaction tank and the flotation tank as described above, the apparatus becomes large as a whole,
There were restrictions on the installation location and movement of the device, and it was difficult to use it in places other than the prescribed place, and it was difficult to apply it to the purification of rivers and lakes.

Therefore, the present applicant has filed Japanese Patent Application Laid-Open No. 5-3178.
As disclosed in Japanese Patent Publication No. 47, a pressurizing pump for supplying the stock solution pumped up from the treated part to the gas-liquid mixing means, a compressor for supplying a compressed gas to the stock solution, and a stock solution supplied by the pressurizing pump. A gas-liquid mixing unit that mixes a compressed gas supplied from a compressor to mix the gas into the liquid to dissolve air in the liquid, and a pressure tank that receives the pressurized liquid after the gas is dissolved. A supply pipe for supplying the pressurized liquid from the pressure tank to the portion to be processed, a pressure valve which is attached to the tip of the supply pipe and opens at a predetermined pressure or more, and a fine bubble generating device comprising: It is possible to maintain the pressure of the pressurized liquid at a predetermined pressure up to the tip of the supply pipe, to dissolve a large amount of gas in the liquid, and to release the gas dissolved at a high pressure to the treated part, Extremely fine bubbles in the processing section A purification device and an oil-water separation device that generate an efficient levitation action, have a simple device configuration, and can be used according to all conditions and locations, and that enable purification and oil-water separation in rivers, lakes and marshes. Is proposed.

[0006]

DISCLOSURE OF THE INVENTION The present invention has further improved the bubble generating device used as the above-mentioned purifying device and oil-water separating device proposed by the present applicant to make it more compact and efficient. (EN) It is intended to provide a fine bubble generator capable of purifying rivers, lakes and marshes and separating oil and water more effectively.

[0007]

A bubble generating apparatus according to the present invention for achieving the above object comprises a pump means for supplying a liquid to a gas-liquid mixing means through a pumping pipe, and a pumping means provided in the middle of the pumping pipe. An air supply unit that is provided to supply gas to the liquid supplied to the gas-liquid mixing unit, a gas-liquid mixing unit that mixes the liquid and the gas to dissolve the gas in the liquid, and the gas-liquid mixing unit. The pressurized liquid in which gas is dissolved is discharged into the liquid in which bubbles are to be generated, and a discharge pipe is provided, and a discharge valve provided at the tip of the discharge pipe and opened at a predetermined pressure or higher, A diaphragm pump is used as the pump means.

Here, the diaphragm pump as the pump means may be provided upstream of the gas-liquid mixing means, or
It may be provided on the rear side of the gas-liquid mixing means, that is, on the downstream side of the gas-liquid mixing means. When the diaphragm pump is provided on the downstream side of the gas-liquid mixing means, the air supply means is on the downstream side of the diaphragm pump, and therefore the air supply means may be natural air supply. For example, a nozzle is provided so as to project in the axial direction toward a reduced diameter portion formed in the central portion of a tubular container, and an inflow pipe for introducing air from outside the container is provided in the vicinity of the nozzle, and the nozzle is supplied into the container. By ejecting liquid from the nozzle toward the reduced diameter portion in the container, air is sucked from the inflow pipe by the negative pressure due to the jet flow and diffusion of the jet flow, and the ejector is taken into the liquid. It should be installed on the upstream side of. Further, when the diaphragm pump is provided upstream of the gas-liquid mixing means and the air supply means is located downstream of the diaphragm pump, the diaphragm pump is operated against the pressure of the pressurized water supplied to the gas-liquid mixing means by the diaphragm pump. Since it is necessary to supply gas to the pump, a compressed gas is supplied to the pumping pipe between the diaphragm pump and the gas-liquid mixing means using a compressor as the air supply means. In this case, in order to prevent the backflow of the liquid from the pumping liquid pipe, a check valve is provided between the compressor and the pumping liquid pipe.

The gas-liquid mixing means mixes the gas supplied by the gas supply means with the liquid supplied by the diaphragm pump to completely dissolve the gas in the liquid. As this gas-liquid mixing means, a known static mixer or the gas-liquid mixing device disclosed in Japanese Utility Model Laid-Open No. 2-112321 can be used. As a general structure of the static mixer, a helical element having a right-handed twist of 180 ° and a helical element of a left-handed twist of 180 ° are arranged in a cylindrical housing at right angles to each other. The liquid and gas supplied under pressure into the housing are divided by the element, and the flow is reversed by alternately passing through the right-handed twist element and the left-handed twist element to mix with each other. In addition, the liquid and the gas are efficiently mixed by continuously moving from the central portion to the inner wall surface of the housing and to the central portion along the twisted surface of the element.

Further, in the gas-liquid mixing device described in Japanese Utility Model Laid-Open No. 2-112321, a spiral right-handed screw and a left-handed screw are provided inside a cylindrical container, and their outer edges are in close contact with the inner wall of the container. It is fixed alternately coaxially in the state, the liquid and gas supplied into the container are guided to the front while being given counterclockwise rotation by the counterclockwise screw, and then rapidly by the clockwise screw. The liquid and gas are mixed by the phase change of the rotation direction to the right to create a turbulent state, which is then guided forward while being given a further clockwise rotation, and then rapidly rotated again by the next counterclockwise screw. The liquid and gas are further mixed by phase-shifting the direction counterclockwise to be in a turbulent state, and by repeating this, the gas is completely dissolved in the liquid.

Further, the diaphragm pump as the pump means pumps up the liquid through the pumping pipe, supplies it to the gas-liquid mixing means, and discharges the pressurized liquid in which the gas is dissolved by the gas-liquid mixing means. It is to be discharged from the discharge valve at the tip of the pipe. For this diaphragm pump,
An air driven reciprocating diaphragm pump driven by compressed gas supplied from a compressor is used.

Further, the discharge valve provided at the tip of the discharge pipe is opened at a predetermined pressure, and the discharge valve discharges the pressure of the pressurized liquid in which gas is dissolved from the discharge valve. During this period, the pressure is maintained at or above a predetermined pressure to maintain the dissolved amount of the gas dissolved in the discharged liquid at or above a predetermined amount.

Next, a second aspect of the present invention is, in the above-described fine bubble generator, provided in the middle of the discharge pipe is a pressure tank for receiving the pressure liquid in which the gas is dissolved by the gas-liquid mixing means. It will be. The pressurized tank stores the pressurized liquid, in which the gas is dissolved by the gas-liquid mixing means and is pumped by the pumping force of the pump means, in a pressurized state, and the pressure of the pressurized liquid is maintained at a predetermined pressure. Then, the liquid is discharged from the discharge valve at the tip through the discharge pipe.

A third aspect of the present invention is to provide a drug supply means in the middle of the pumping pipe. This chemical supply means is for supplying a coagulant or a neutralizing agent for neutralizing the coagulant into a liquid when the bubble generating apparatus is used as a purifying apparatus, an oil / water separating apparatus, or the like. In the case of a device in which a diaphragm pump as a pumping device is provided on the downstream side of the gas-liquid mixing device, as in the case of the air-supplying device, this drug-supplying device is simply a pipe for a drug tank upstream of the gas-liquid mixing device. It may be connected to the pumping pipe on the side and supplied naturally.
When the diaphragm pump is provided on the upstream side of the gas-liquid mixing means and the drug supply means is on the downstream side of the diaphragm pump, the diaphragm pump is placed in the liquid against the pressure of the pressurized water supplied to the gas-liquid mixing means by the diaphragm pump. Since it is necessary to supply the drug to the distillate side of the diaphragm pump from the drug tank against the pressure feed pump, a check valve for preventing backflow of the liquid is provided.

In a fourth aspect of the present invention, a pressure valve that opens at a predetermined pressure or higher is provided at the tip of the discharge pipe as a discharge valve, and a fifth aspect of the present invention is as a discharge valve. , A drive valve such as a solenoid valve is attached to the tip of the discharge pipe, and a pressure gauge for measuring the pressure of the pressurized liquid at the tip of the discharge pipe, and a pressurized liquid at the tip of the discharge pipe based on a signal from the pressure gauge Is provided with an opening / closing control means for opening the drive valve when the pressure exceeds a predetermined pressure. Each of these discharge valves maintains the pressurized liquid discharged from the tip of the discharge pipe in which the gas is dissolved at a predetermined pressure or more, so that the amount of gas dissolved in the liquid is always kept above a certain level. The gas dissolved in the liquid is prevented from being generated as bubbles before being ejected from the discharge valve, and the expansion action of the bubbles after discharge and the adhesion action to the flock due to bursting are more efficient. It is something that can be done.

A sixth aspect of the present invention is a micro-bubble generating device using a tube pump instead of the diaphragm pump as pump means in the above-mentioned micro-bubble generating device. This tube pump crushes the tube by a pressing roller that rotates and slides along the tube, sucks the liquid into the tube by the vacuum suction force by the restoring force of the crushed tube, and further discharges the liquid by the pressing force of the pressing roller. The liquid is continuously fed under pressure by repeating this series of operations. By using this tube pump as the pump means of the bubble generating device, the liquid is supplied to the gas-liquid mixing device in a pressurized state by the strong suction force and pressure feeding force of the tube pump,
The gas is mixed and dissolved, and the pressurized liquid in which the gas is dissolved is further discharged from the discharge valve at the tip of the discharge pipe by the strong pumping force of the tube pump.

[0017]

In the above-described fine bubble generating apparatus according to the present invention, the tip of the pumping pipe and the discharge valve at the tip of the discharge pipe are both positioned in the liquid of the portion to be treated, and the pump means is driven. When the stock solution of the portion to be treated is supplied to the gas-liquid mixing means, the gas supplied by the gas supply means is mixed with the stock solution by the gas-liquid mixing means, and the gas is completely dissolved in the liquid. The undiluted solution in which this gas is dissolved is discharged from the discharge valve at the tip through the discharge pipe from the gas-liquid mixing means by the pumping force of the pump means, but the discharge valve is opened only at a predetermined pressure. The pressurized liquid in which the gas is dissolved is maintained at a predetermined pressure until it is discharged from the discharge valve provided at the tip of the discharge pipe, and is released from the discharge valve into the liquid in the processing target portion. . Then, the gas dissolved in the liquid expands and bursts by opening into the treated portion to become fine bubbles, and the fine bubbles float in the liquid in the treated portion while expanding. , It adheres to the flocs in the liquid of the treated part and floats them.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a fine bubble generator according to the present invention.
It is a diagram showing the overall layout when used as a purification device for rivers, lakes and marshes. In the figure, reference numeral 1 is a gas-liquid mixing means, and reference numeral 2 is a liquid, which is provided on the downstream side of the gas-liquid mixing means 1, pumped up a stock solution from a river, a lake, or other parts to be processed through a pumping pipe 7, and Pump means for supplying to the gas-liquid mixing means 1, reference numeral 3 supplies air to the stock solution supplied to the gas-liquid mixing means 1 by the pump means 2 provided on the upstream side of the gas-liquid mixing means 1. For supplying air, reference numeral 4 is a pressure tank provided on the downstream side of the pump means 2, reference numeral 5 is a discharge valve provided on the tip of the discharge pipe 6 on the downstream side of the pressure tank 4, Reference numeral 8 is a medicine tank connected to the pumping liquid pipe 7 on the upstream side of the gas-liquid mixing means 1 via a check valve 9, and reference numeral 10 is provided at the tip of the pumping liquid pipe 7. It is a float valve.

In order to purify rivers, lakes and marshes using this fine bubble generator, first, the float valve 10 at the tip of the pumping pipe 7
And the discharge valve 5 at the tip of the liquid discharge pipe 6 are both positioned in the liquid of the river A, the lake or the marsh to be purified and other parts to be treated A, and when the pump means 2 is driven, the suction force of the pump means 2 causes The stock solution is pumped up from the processing section A, and the air supplied from the air supply means 3 is completely dissolved in the stock solution by the gas-liquid mixing means 1. The stock solution in which the air is completely dissolved is sent from the gas-liquid mixing means 1 to the pressure tank 4 in a pressurized state by the pumping force of the pump means 2, and is further discharged through the discharge pipe 6 to the discharge valve 5 at its tip. Is discharged into the portion A to be processed. Then, the pressurized liquid in which the air is dissolved is discharged to the processing target portion A to release the pressure, and the air dissolved in the liquid expands and bursts to generate bubbles B. The bubble B floats while expanding in the portion A to be processed, and adheres to the floc F in the liquid of the portion A to be processed to float the floc F. By scooping up the floating flocs F with a net or the like, the treated portion A is cleaned.

Here, as the gas-liquid mixing means 1, a known static mixer as described above or the Japanese Patent Application No. 2-1 is used.
The gas-liquid mixing device described in 12321 can be used. Further, the air supply means 3 has a nozzle 32 projectingly provided in the axial direction toward a reduced diameter portion 31 formed in the central portion of the cylindrical container 30,
An inflow pipe 33 for introducing air from the outside of the container 30 is provided in the vicinity of the nozzle 32, and the liquid supplied into the container 30 is supplied to the nozzle 32.
It is possible to use an ejector configured to suck air from the inflow pipe 33 and to take it into the liquid by injecting air toward the reduced diameter portion 31 in the container from the negative pressure due to the jet flow and diffusion of the jet flow. it can. Further, instead of such an ejector, an inflow pipe of air is simply connected to the pumping pipe 7 and the pumping pipe 7 is naturally supplied with air by negative pressure due to the flow of the liquid flowing in the pumping pipe 7. You may allow it.

Further, the pump means 2 pumps up the stock solution from the portion A to be processed by its suction force, and the gas-liquid mixing means 1
And the air is mixed by the gas-liquid mixing means 1 to completely dissolve the air in the undiluted solution, and by its pressure feeding force,
This is for discharging the stock solution, in which the air is completely dissolved, from the discharge valve 5 at the tip of the liquid discharge pipe 6 to the portion A to be processed again in a pressurized state. As the pump means 2, a diaphragm pump is used here. The diaphragm pump used here is an air-driven diaphragm pump having a structure as shown in FIG. 3, for example.
The diaphragm pump 20 includes a pair of left and right air chambers 21, 21.
And material chambers 22 and 22 which are separated from the air chamber 21 by a diaphragm 26. Above and below the material chamber 22, a ball valve 23,
24 is provided in the form of a check valve. Then, when compressed air is sent from the compressor 11 to the left air chamber 21, the center rod 25 horizontally moves to the left together with the left diaphragm 26 and discharges the liquid in the left material chamber 22 from the upper discharge port 27. At the same time, the right diaphragm 26 also moves horizontally at the same time, and the liquid is sucked into the material chamber 22 on the right side from the suction port 28. Then, when the center rod 25 moves to the left to the full stroke, an air switching valve (not shown) operates and the compressed air from the compressor 11 moves to the right air chamber 21.
Sent to Then, in exactly the same manner as described above, the liquid in the right material chamber 22 is pushed out and discharged from the discharge port 27, and at the same time, the liquid is sucked into the left material chamber 22 from the suction port 28. By repeating this series of operations, the liquid is continuously sucked and discharged.

The diaphragm pump 20 as described above is small and has a large capacity, and the flow rate and the discharge pressure can be easily adjusted only by operating the control valve, and since no motor is used, It is easy to carry and can be moved easily. In the present invention, the diaphragm pump 20 supplies the stock solution of the portion A to be treated to the gas-liquid mixing means 1, and the liquid in which the gas is dissolved by the gas-liquid mixing means 1 is pressurized through the discharge pipe 6. Since it is used as the pump means 2 for discharging from the discharge valve 5 as it is, the entire apparatus can be made compact. Moreover, since the diaphragm pump 20 is small in size, has a large capacity, and has a large pumping force as described above, it is possible to downsize the pressurizing tank 4 or to omit the pressurizing tank 4.

If the pressure tank 4 is downsized or can be omitted as described above, the device can be made more compact by using a separate type in which each part of the device can be divided. That is, in the case of the conventional device, it is necessary to fix all of the static mixer, the pressure tank, the drug tank, the pressure pump thereof, etc. as the gas-liquid mixing means 1 to the large pressure pump as the pump means 2. However, in the case of using the small-sized and large-capacity diaphragm pump 20 as described above, by making the pressure tank 4 small and further omitting it, each part of the device becomes small. , They can be easily separated from each other. When the pressure tank 4 is omitted as described above, a thick pipe system may be used as the liquid discharge pipe 6 leading to the discharge valve 5, and an air bleeding valve may be provided here.

The pressure tank 4 stores the liquid in which the air is dissolved by the gas-liquid mixing means 1 in a pressurized state, and dissolves in the pressurized liquid from the air out silencer 12 provided above the liquid. The surplus air that was not used is released to the outside. In this case, when air or other inexpensive and harmless gas is used as the gas to be dissolved in the liquid, it is directly discharged into the atmosphere, but if not, it is recovered from the air out silencer 12. Collect in a tank, etc. Further, in the illustrated example, the pressure tank 4
In addition, a safety valve 13 is provided which opens when the pressure in the pressure tank 4 exceeds a certain level. The opening pressure of the safety valve 13 is set to 10 kg / cm ² in this embodiment.

In this embodiment, the pressure tank 4
Discharge valve 5 attached to the tip of a discharge pipe 6 connected to
The pressure valve 14 is used as The pressure valve 14 is opened when the pressure of the pressurized liquid at the tip of the liquid discharge pipe 6 becomes equal to or higher than a predetermined pressure, and when the pressure is equal to or lower than the pressure, the valve remains closed. In this way, as the discharge valve 5, by mounting the pressure valve 14 that opens only at a predetermined pressure or higher for the first time on the tip of the liquid discharge pipe 6, the pressure of the pressurized liquid supplied to the processing target portion A is It is possible to always maintain a pressure equal to or higher than a predetermined pressure, to constantly maintain the dissolved amount of air in the pressurized liquid at a high concentration above a certain level, and to completely dissolve the air in the liquid until it is discharged from the discharge valve 5. In this state, the bubbles generated after the discharge are made to be ultrafine, and the bubbles can efficiently adhere to the flocs F and the flotation of the flocs F associated therewith. In addition, as described above, by keeping the pressure of the pressurized liquid to the tip of the liquid discharge pipe 6 always higher than a predetermined pressure, the pressure of the discharged pressurized liquid can be always maintained at a certain level or higher. Regardless of the length of the pipe 6, a constant purification effect can be always exerted, and the liquid discharge pipe 6 can be appropriately extended and moved to a desired place for the purification operation.

Here, the pressure valve used as the discharge valve 5
As the valve 14, a valve generally used as a safety valve can be used. The structure of the pressure valve 14 has a structure in which a space between the inflow port and the outflow port is elastically closed by a valve body associated with an elastic biasing means such as a spring, and liquid flowing in from the inflow port is When the pressure exceeds a predetermined pressure, the valve body is generally opened by the pressure against the urging force of the elastic urging means to let the liquid flow out from the outflow port. In the present invention, the pressure valve 14 as the discharge valve 5 is set so as to be opened when the pressure of the pressurized liquid at the tip of the discharge pipe 6 becomes 7 kg / cm ² or more, so that the treated portion A The pressure of the pressurized liquid discharged into the discharge valve 5 is set to the above pressure or more.
The bubbles generated from the pressurized liquid discharged from the are made ultra-fine, and the effective floating action by the bubbles is exhibited.

Further, in this embodiment, the coagulant stored in the chemical tank 8 and the neutralizing agent for neutralizing the coagulant are mixed with the stock solution on the upstream side of the gas-liquid mixing means 1. As the aggregating agent, a polyaluminum chloride solution or other polymer aggregating agent, and as the neutralizing agent, slaked lime or the like is appropriately used.

Next, FIG. 2 shows an overall layout diagram when another embodiment of the bubble generating device according to the present invention is used as a purifying device. In this device, the gas-liquid mixing means 1 is provided on the downstream side of the diaphragm pump 20 as the pump means 2, and the air supply means 3 uses a compressor 11 for supplying compressed air to the diaphragm pump 20. Compressed air is supplied to the stock solution of the pumping liquid pipe 7 from 11 on the downstream side of the diaphragm pump 20, and the drug from the drug tank 8 is pressed into the pumping liquid pipe 7 by the pressure pump 15 on the downstream side of the diaphragm pump 20. I am trying. The pressure of the pressure feed pump 15 is set to 10 kg / cm ² . Further, check valves 16 and 17 are provided between the compressor 11, the pressure feed pump 15 and the pumping pipe 7, respectively, so that the undiluted liquid supplied by the diaphragm pump 20 is compressed by the compressor.
This prevents backflow in the direction of 11 and the medicine tank 8.

The device shown in FIG. 4 is exactly the same as the device shown in FIG. 2 except that a tube pump 40 is used instead of the diaphragm pump 20 as the pump means 2 in the bubble generating device shown in FIG. 5 is an embodiment of the micro-bubble generator having the above-mentioned configuration, and further, the one shown in FIG. 5 uses a tube pump 40 instead of the diaphragm pump 20 as the pump means 2 in the bubble generator shown in FIG. Except for the above, this is an embodiment of a fine bubble generator having the same configuration as the device of FIG.

The tube pump 40 is, for example, as shown in FIG. 6, is provided inside the tube 41 along a rubber tube 41 arranged in a substantially U shape, and is rotated by a driving means as needed. The two pressing rollers 42, 42 fixed to 45 are rotatively slid to crush the tube 41 to push out the liquid in the tube 41 from the discharge port 43 in the rotation direction, and to restore the crushed tube 42's restoring force. , The guide roller 44 fixed to the rotating body 45 sandwiches the tube 41 from both sides of the tube 41 and forcibly restores it to generate a vacuum suction force, which sucks the liquid from the suction port 46 and is sucked into the tube 41. The liquid is ejected from the ejection port 43 by the pressing roller 42 in the same manner as described above. By repeating this series of operations, the liquid is continuously sucked and discharged. Therefore, as shown in FIG. 4, the tube pump 40 is provided in the middle of the pumping pipe 7 on the upstream side of the gas-liquid mixing means 1, or on the downstream side of the gas-liquid mixing means 1 as shown in FIG. By providing it in the middle of 6, the treated part A can be processed by the strong suction force and the pressure feeding force of the tube pump 40, just as in the case of using the diaphragm pump 20.
The undiluted solution is pumped up and supplied to the gas-liquid mixing means 1, the air is mixed to completely dissolve the air in the undiluted solution, and the undiluted solution in which the air is dissolved is kept in a predetermined pressure in the discharge pipe 6. Can be pumped and discharged from the discharge valve 5 at the tip.

In each of the above embodiments, the pressure valve 14 is used as the discharge valve 5 provided at the tip of the discharge pipe 6.
As the discharge valve 5, the one shown in FIG. 7 may be used. In the configuration shown in FIG. 7, a solenoid valve 51 is attached to the tip of the discharge pipe 6, and a pressure gauge 52 for measuring the pressure of the liquid in the discharge pipe 6 is attached to the tip of the discharge pipe 6 or the solenoid valve.
Attached to 51, the electric signal output from the pressure gauge 52 is sent to the opening / closing control means 53 to process this signal, and when the set value exceeds a preset value corresponding to a predetermined pressure, the opening / closing control means
The solenoid valve 51 is energized from 53 to control the opening of the solenoid valve 51. In this embodiment, the pressure of the pressurized liquid at the tip of the discharge pipe 6 measured by the pressure gauge 52 is 7 kg.
The solenoid valve 51 is set to open when the pressure exceeds / cm ² . Here, as the pressure gauge 52, those having various structures for generating an electric signal according to a pressure value can be used, and for example, the displacement of a Bourdon tube, a diaphragm or a bellows is detected by a displacement sensor and an electric signal is detected. With a structure that generates a voltage, a capacitance type pressure sensor that electrically detects the displacement of the capacitance between the movable electrode plates, a semiconductor pressure sensor that integrates a diaphragm and a strain gauge, and a piezoelectric pressure that uses a piezoelectric element. A sensor or the like can be used.

In this way, as the discharge valve 5, by mounting the electromagnetic valve 51, which is controlled to open for the first time at a predetermined pressure or more, at the tip of the liquid discharge pipe 6, the treated portion A is processed as in the case of the pressure valve 14. The pressure of the pressurized liquid discharged to the can be always higher than a predetermined pressure, and the air is completely dissolved in the pressurized liquid until the pressure is discharged from the discharge valve 5, and the pressure is increased. The amount of air dissolved in the liquid is always maintained at a high concentration above a certain level, and the bubbles generated from the liquid discharged from the discharge valve 5 are regarded as ultra-fine particles, and the adhesion action of the bubbles to the flocs F, and It is possible to efficiently perform the floating action of the floc F by. Moreover, in this way, the pressure of the pressurized liquid can be always maintained at a predetermined pressure or more up to the tip of the liquid discharge pipe 6, so that a constant purification effect can be obtained regardless of the length of the liquid discharge pipe 6. Can be demonstrated and therefore
By extending the discharge pipe 6 long, it becomes possible to perform a purification operation in a place far away from the gas-liquid mixing means 1 and the pressure tank 4.
Purification of rivers and lakes, and separation of oil and water become easy.

In each of the above embodiments, the case where the present fine bubble generator is used as a purifier is described, but the same device configuration may be used when used as an oil / water separator. In this case, ultrafine bubbles generated from the pressurized liquid discharged from the discharge valve 5 at the tip of the liquid discharge pipe 6 float in the processing target portion A while expanding and coexist in the processing target portion A. By adhering to the fine oil content and floating it, the oil-water separation of the treated portion A is performed.

[0034]

As described above, the fine bubble generating apparatus according to the present invention supplies the liquid to the gas-liquid mixing means, mixes the gas with the liquid to completely dissolve the gas in the liquid, and By using a diaphragm pump or a tube pump as pump means for discharging the dissolved liquid from the discharge valve at the tip of the discharge pipe while maintaining a predetermined pressure, the overall configuration of the device is downsized. Together with
By separating each part of the device, it becomes possible to move it compactly, and it is possible to perform purification operation and oil-water separation operation under all conditions including rivers and lakes.

[Brief description of drawings]

FIG. 1 is an overall layout diagram showing a first embodiment when a fine bubble generator according to the present invention is used as a purifier.

FIG. 2 is an overall layout diagram showing a second embodiment when the fine bubble generator according to the present invention is used as a purifier.

FIG. 3 is an explanatory diagram showing an example of a diaphragm pump.

FIG. 4 is an overall layout diagram showing a third embodiment when the fine bubble generator according to the present invention is used as a purifier.

FIG. 5 is an overall layout diagram showing a fourth embodiment when the fine bubble generator according to the present invention is used as a purifier.

FIG. 6 is an explanatory diagram showing an example of a tube pump.

FIG. 7 is a layout view of a main part of a fine bubble generator showing another embodiment of the discharge valve.

[Explanation of symbols]

1 gas-liquid mixing means, 2 pump means, 3 air supply means, 4 pressure tank, 5 discharge valve, 6 discharge pipe,
7 pumping pipe, 8 chemical tank, 9 check valve, 10 float valve, 11 compressor, 12 air out silencer, 13 safety valve, 14 pressure valve, 15 pressure pump, 16 check valve, 17 check valve, 20 diaphragm pump , 21 air chamber, 22 material chamber, 23 ball valve,
24 ball valve, 25 center rod, 26 diaphragm, 27 discharge port, 28 suction port, 30 tubular container, 31
Reduced diameter part, 32 nozzles, 33 inflow pipe, 40 tube pump, 41 tube, 42 pressure roller, 43 discharge port, 44 guide roller, 45 rotating body, 46 suction port, 51 solenoid valve, 52 pressure gauge, 53 opening / closing control means .

Claims (6)

[Claims] 1. A pump means for supplying a liquid to a gas-liquid mixing means through a pumping liquid pipe, and an air supply means provided in the middle of the pumping liquid pipe for supplying a gas to the liquid supplied to the gas-liquid mixing means. A gas-liquid mixing unit that mixes the liquid and the gas to dissolve the gas in the liquid; and a release unit that releases the pressurized liquid in which the gas is dissolved by the gas-liquid mixing unit into the liquid in which bubbles are to be generated. A fine bubble generating device comprising a liquid pipe and a discharge valve provided at a tip of the liquid discharge pipe and opened at a predetermined pressure or more, wherein a diaphragm pump is used as the pump means. 2. The fine bubble generator according to claim 1, wherein a pressure tank for receiving the pressurized liquid in which the gas is dissolved by the gas-liquid mixing means is provided in the middle of the discharge pipe. 3. The fine bubble generator according to claim 1, wherein a drug supply means is provided in the middle of the pumping pipe. 4. The fine bubble generator according to claim 1, wherein a pressure valve that opens at a predetermined pressure or higher is provided at the tip of the liquid discharge pipe as a discharge valve. 5. As a discharge valve, a drive valve such as a solenoid valve is attached to the tip of the discharge pipe, and a pressure gauge for measuring the pressure of the pressurized liquid at the tip of the discharge pipe and a signal from the pressure gauge are used. 2. The fine bubble generator according to claim 1, further comprising opening / closing control means for opening the drive valve when the pressurized liquid at the tip of the discharge pipe has a predetermined pressure or more. 6. The fine bubble generator according to claim 1, wherein a tube pump is used instead of the diaphragm pump as the pump means.