JP2009160576A - Fine air bubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems, such as loud noises, a pump with larger power, a large scale as the total system, and high cost,in conventional fine air bubble generators, which cannot produce a large amount of fine air bubbles without imparting a high feed pressure. <P>SOLUTION: A fluid in a circling chamber is smoothly circled to make a high circling angular velocity by reducing friction resistance in the circling chamber and shaping the circling chamber not to generate an excess acceleration, and installing a vane shaped nozzle, a preliminary circling chamber and then a guide vane smoothly changing the flow direction of a fluid from an introducing opening on the outer periphery of the circling chamber. Then, air bubbles large in a diameter are selectively sheared again by installing a cylindrical-shaped cover for circulation just after the outlet opening of the circling chamber. Further, unfoamed liquid in which foams are dissolved in the liquid are made to pass through a flow passage accelerating depressurized foaming. Thereby, a large amount of fine air bubbles are generated even by low consumption energy. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention mainly relates to a fine bubble generating apparatus that generates a large amount of fine bubbles in water or a liquid in a gas-liquid reaction tank such as a water tank, a bathtub, or a culture pond.

  In recent years, by generating fine bubbles in water, purification of water, assistance in purification, means for increasing dissolved oxygen in water, or the reaction speed and reaction efficiency of gas-liquid reaction tanks, Research, development, and commercialization have been carried out, such as generating fine bubbles in the bathtub to obtain a massage effect, thermal effect and cleaning effect, and removing dirt from parts, etc., but in order to generate a large amount of fine bubbles Required a high supply pressure.

  As the shape of the swirl chamber of the conventional fine bubble generating device, for example, Japanese Patent Laid-Open No. 2000-000447 discloses a container body having a conical, frustoconical, bottle-shaped or wine bottle-shaped space, and an inner wall circle of the same space. And a pressurized liquid inlet opened in a tangential direction to a part of the peripheral surface.

  In Japanese Patent No. 3682286, “a container body having a hollow portion that is formed substantially rotationally symmetric and has a diameter reduced toward one or both of the axial directions of the rotational symmetry axis, and a tangential opening is formed in the peripheral wall portion of the container body. “Gas-liquid introduction hole” is disclosed.

  Japanese Patent Application Laid-Open No. 2004-195393 discloses that “one end of a short cylinder having a circular liquid chamber formed therein is closed with an end wall, and the other end is provided with an opening of a predetermined diameter communicating with the liquid chamber, and the cross section is substantially bowl-shaped. A mixing tube having a U-shape is disclosed, and a water guide pipe for introducing water from the outside provided to communicate with the liquid chamber in a tangential direction of the outer periphery of the liquid chamber is disclosed.

  Japanese Patent Laid-Open No. 2006-142300 discloses that “a gas-liquid swirl chamber, which is a gas-liquid swirl space formed inside a cylindrical casing, and a (liquid omitted) liquid introduction port are liquids of this double cylindrical structure portion. A space provided between the casing of the double cylindrical structure and the liquid supply cylinder provided above the peripheral wall surface of the supply cylinder rectifies the swirling flow generated by the liquid introduced from the liquid inlet. The preliminary swivel portion is configured ".

  Japanese Patent Application Laid-Open No. 2006-015312 discloses a “first inlet for inflow of liquid, a second inlet for inflow of gas, and a housing for swirling liquid mixed with gas (the inner circumference of the housing is And a shape along an involute-like curve).

  Japanese Patent Application Laid-Open No. 2007-237155 states that “the cylindrical body has a circular concave lens-like inner chamber, and the inner chamber circumferential portion forms a swirl flow along the tangential direction of the inner wall circumferential portion without being disturbed. In addition, a slit is opened in parallel with the cylinder to provide a pressurized liquid inlet ”.

Japanese Patent Application Laid-Open No. 2007-111616 discloses that a container having a space in which a swirling flow can be generated (a space is a cylinder or a cone) and a pressurized liquid that generates the swirling flow in the space are guided into the container. And a pressurized liquid inlet provided on a side surface of the container.
JP 2000-000447 A Japanese Patent No. 3682286 JP 2004-195393 A JP 2006-142300 A JP 2006-015312 A JP 2007-237155 A JP 2007-111616 A

However, the above prior art has the following problems.
As shown in FIG. 19, in the prior art except for Patent Document 4, the flow velocity of the inlet that enters the swirling chamber where the pressurized fluid causes a swirling flow is around 2 m / sec. There is also resistance, and in Patent Document 4, there is an angle between the introduction direction and the swirl direction, causing kinetic energy waste and turbulence, and most of them have a diameter of the rush flow relative to the swirl chamber diameter. Since the ratio is large, the substantial diameter of the acceleration region 601 where the turning angular velocity is increased is reduced, and the turning speed at the turning flow outlet is reduced. To eliminate this, pressurization is performed. It was necessary to increase the supply pressure of the fluid.

  In addition, the swirl chamber has various shapes such as a cylindrical shape, a conical shape, a truncated cone shape, a bottle shape, a wine bottle shape, a spherical shape, a bullet shape, a hemispherical shape, a short cylindrical shape, an involute shape on the outer periphery, and a concave lens shape. In addition to unnecessary frictional resistance on the wall, the liquid that enters the swirl chamber has a shape that generates unnecessary deceleration and acceleration due to acceleration, and requires more energy. Similarly, it is necessary to increase the supply pressure of the pressurized fluid.

  Furthermore, many types of distorted swirling flow have the problem of unnecessary generation of turbulent flow and large vibration and noise due to bubble shearing.

  In addition, as an example, the supply pressure to the fine bubble generator of equipment that is commercialized as a high concentration generator for bathtubs such as a milk bath consumes a lot of energy as low as about 0.26 MPa, Peripheral devices such as pumps have high output, and are large and expensive.

  In addition, as a characteristic of the swirling type fine bubble generating device, if the swirling speed at the liquid outlet is increased, the bubble size decreases, and if the amount of supply gas is increased, the bubble size increases. is there.

  The present invention has been made in view of the above-mentioned problems, and its object is to generate more effective, fine bubbles having a diameter of around 50 microns with less power, and to generate vibration and noise. To develop a microbubble generator that suppresses the above, and to make the entire microbubble generator system compact and provide it at low cost.

  The fine bubble generating apparatus of the present invention was devised to increase the fine bubbles in the liquid per unit volume. To achieve this, the liquid at the outlet of the swirling liquid with limited power is used. It is necessary to increase the turning speed and the shearing force.

  To that end, to effectively use the kinetic energy and pressure energy of the liquid supplied from the liquid inlet, the frictional resistance is reduced in the swirling chamber where the liquid is moving at high speed, the energy loss is reduced due to deceleration, and the swirl This is possible by smoothing the shape and direction of the swirl chamber that does not generate excessive acceleration in the flow. The inventor has devised the following measures.

  As shown in FIGS. 1 and 2, the fine bubble generator according to claim 1 of the present invention has an area obtained by multiplying the same width W1 as the nozzle width attached to the outer periphery of the swirl chamber by the peripheral length, and an intermediate portion. The surface obtained by multiplying the width W2 by the circumference and the area obtained by multiplying the width W3 of the lead-out portion by the circumference have the same curved surface, and the velocity ejected from the nozzle and the first and second rounds, n By making the flow velocity around the circumference almost the same, the front wall is like an intermediate space that is shaped and overlapped with the outline of Mt. A main swirl chamber with a rear wall is provided.

  Although there are various swirl chamber shapes in the prior art, it is necessary to increase the swirling flow velocity, resulting in resistance and increasing the supply pressure.

  In addition, a liquid outlet for high-speed swirling is drilled on the center line at the position where it hits the top of the front wall, and the dimension from the swirling chamber to the open end is as short as about 1 mm. Reduced frictional resistance.

  In the prior art, this is as long as several mm to about 10 mm, and the turning angular velocity has been reduced until release.

  In addition, 10 locations on the outer periphery of the main swirl chamber that have a function of increasing the jet flow at a constant speed for generating a thin strip-shaped jet in the tangential direction or by gradually reducing the area of the outflow portion from the inflow portion. Front and rear vane nozzles are installed. As a result, the turning angular velocity is increased and the turning speed is increased without disturbing turning in the swirl chamber. In addition, since the initial flow velocity on the outer periphery of the swirl chamber can be arbitrarily determined in accordance with the swirling angular velocity at the outlet, the design according to the flow rate becomes possible.

  In the prior art, most of the air is blown into the swirl chamber while maintaining the inner diameter that matches the inlet size determined by the amount of treated water, and the outer periphery of the swirl chamber has friction generated on a wide contact surface. There was also resistance, the flow velocity was once decelerated, and then the turning angular velocity was increased in the small diameter range. As a result, the turning angular velocity was difficult to increase.

  In addition, a pre-swirl chamber is formed on the outer periphery so that the liquid is smoothly and evenly guided from the liquid inlet to the vane nozzle. The inner diameter of the liquid introduction port may be the same diameter or may be tapered to increase the flow velocity.

  In the prior art, the swirl speed was reduced by the frictional resistance with the outer periphery around the nozzle, but in the present invention, the thickness W1 of the outer periphery of the swirl chamber is the same as the width of the vane nozzle, The velocity of the jet is effectively used for the swivel motion.

  Further, a convex portion is provided in the vicinity of the center of the rear wall of the main swirl chamber so that the swirl flow toward the center is smoothly redirected to the outlet.

  With the above structure, the turning angular velocity at the center becomes sufficiently high, centrifugal force and centripetal force work, and an air column axis is generated on the center line. The swirling flow reaches the maximum rotation at the outlet and is discharged to the outside. At this time, it is a fine bubble generator capable of generating a large amount of fine bubbles by drawing the gas of the air column shaft into a viscous, entangled and crushed, and shearing the bubbles.

As shown in FIG. 3, the microbubble generator according to claim 2 of the present invention is the microbubble generator according to claim 1, in which the rear wall is removed and the surfaces are symmetrical to each other so as to be symmetrical. The front wall portion according to claim 1, wherein the front wall portion is installed, the direction of the vane-shaped nozzle is unified, the liquid inlet is provided at one place, and the space of the main swirl chamber is in the shape of the outline of the impeller of both suction centrifugal pumps. The result is a fine bubble generator that can process twice the flow rate with a small number of parts with one set of vane-shaped nozzle portions equipped with a pre-swirl chamber.

  As shown in FIG. 4, the microbubble generator according to claim 3 of the present invention has an inner diameter with a plurality of holes perforated on the circumference with a rear wall immediately after the outlet for the liquid that rotates at high speed. Install a lid with a cylindrical body that is the same size as the outlet, or a lid with a cylindrical body whose inner diameter is the same as that of the outlet, outside the hole. The gas-liquid that has been formed into a film containing fine bubbles can be passed through, and the central portion is set to be at a negative pressure at a minimum interval. The outer circumference of the cylinder of the lid having this cylindrical body is filled with a liquid containing fine bubbles, and is rotating at a low speed but is swirling, and a large-sized object of sheared bubbles or temporarily The gas mixed in a large amount is selectively collected by the centripetal force on the cylindrical outer periphery in which the holes are perforated. The small-sized fine bubbles are discharged from the outer peripheral portion together with the liquid. The collected gas or liquid mixed with large-diameter bubbles is directed to the hole on the circumference of the cylinder, and is sucked through this hole to be sheared again. Also, the outer side of the hole on the circumference of the cylinder is conical. And a function for reducing noise, further comprising a circulation channel that allows gas or large-diameter bubbles to be introduced into the hole, and is sucked from the hole and sheared again. It is a fine bubble generator as described in 1-2.

  As shown in FIGS. 5, 6, 7, and 8, the microbubble generator according to claim 4 of the present invention changes the flow direction of the liquid between the liquid inlet and the pre-swirl chamber, so By giving the swirl, the liquid is more smoothly and evenly guided to the vane-shaped nozzle. Further, the kinetic energy of the swirling liquid is effectively utilized. It is such a microbubble generator of Claims 1 thru | or 3 provided with the guide vane.

  As shown in FIGS. 9 and 10, the fine bubble generator according to claim 5 of the present invention is provided with a gas inlet at a position on the center line of the top of the rear wall of the main swirl chamber, and gas is supplied from the outside. The microbubble generator according to claim 1, further comprising a flow path so as to allow inhalation.

  In the prior art, since the liquid inlet directly flows into the swirl chamber in the tangential direction, the central axis of the liquid swirling at a high speed slightly varies depending on the supply pressure. For this reason, when the pressure is supplied at a pressure far from the design pressure, the air column shaft generated on the swiveling center line deviates from the position of the gas inlet, and intake failure or cavitation occurs due to the high vacuum of the air column shaft. However, the vicinity of the gas inlet may be eroded.

  As shown in FIGS. 11, 12, 13, and 14, the microbubble generator according to claim 6 of the present invention releases a part of the gas pressurized and dissolved in the liquid without being bubbled. In order to efficiently bubble the dissolved gas, a predetermined space is provided immediately after the outlet of the liquid that rotates at high speed or immediately after the circulation channel structure according to claim 3, and a cylinder is formed on the outer side wall. A flow path that promotes vacuum-like or corn-like decompression foaming is provided, wherein decompression foaming is performed, more fine bubbles can be generated, and noise reduction is further provided. It is a microbubble generator of description.

  The fine bubble generator according to claim 7 of the present invention solves the problem that, when used in drainage, sewage treatment or the like, fibrous foreign matter that is difficult to be completely captured by the strainer is caught by the vane nozzle. As shown in FIG. 15, the width of the vane nozzle is reduced while maintaining the distance between the front wall and the rear wall, and as shown in FIG. 16, while maintaining the distance between the front walls. The fine bubble generating device according to any one of claims 1 to 6, wherein a gap is provided on the wall side, the rear wall side, or in the middle so that foreign substances can easily pass therethrough.

  The fine bubble generating device according to claim 8 of the present invention is a structure for providing the fine bubble generating device according to claim 3 with a function of further promoting a bubble diameter selection function and foaming of dissolved gas. As shown in FIG. 17, a cylindrical body provided with a gap in the radial direction is installed on the outer periphery of the circulation cylindrical portion of the circulation cylindrical lid so as to have a flow passage area where the resistance by the fluid is negligible. Maximize the function of selecting large and small bubbles by maximizing the turning angular velocity at. Furthermore, a second cylindrical body is provided on the outer periphery of the cylindrical body in the same manner, and the dissolved gas dissolved in the introduced liquid is foamed by passing the flow path through a zigzag and generating a vortex. Let For this purpose, a plurality of slit-like or hole-like flow paths are provided at one end of the cylindrical body, or a single or double cylindrical tubular body with a reduced flow path is provided. As for the positions of the slits, holes and gaps, the first is provided on the side opposite to the outlet and the second is provided on the outlet. Thereby, more fine bubbles can be generated. The microbubble generator according to any one of claims 1 to 7, which incorporates a cylindrical body having a function of enhancing the bubble diameter selection and a function of promoting foaming of dissolved gas.

  As shown in FIG. 18, the fine bubble generator according to claim 9 of the present invention has a shape of the rear wall portion changed from Mt. Fuji to a conical shape, and the flow of the vane-shaped nozzle inflow portion is changed from an acute angle to an obtuse angle, 9. The microbubble generator according to claim 1, wherein the flow direction of the outer periphery of the main swirl chamber is a diagonal flow in order to prevent friction and reduce frictional resistance.

  As shown in FIG. 19, the fine bubble generating device according to claim 10 of the present invention is the fine bubble generating device according to claim 3, wherein the circulation cylindrical portion of the circulation cylindrical lid is a cylinder with a lid. It is separated from the rear wall of the lid so that it can move in the axial direction, and the initial position is finely released from the outlet port during operation by a support member with a flexible and elastic communicating part. The gas-liquid in the form of a film containing bubbles can pass through and is automatically drawn to the outlet side by the negative pressure at the center of the tube, which is wider than the minimum interval at which the center of the tube is negative, and at the start of operation. During operation, it is fixed at the position where it becomes the minimum interval, and the gap is automatically adjusted by the axial thrust due to the pressure difference between the inside and outside of the cylindrical body with lid, The microbubble generator according to any one of claims 1 to 9, which has a blocking prevention function.

  As shown in FIG. 20, the fine bubble generating device according to claim 11 of the present invention is the fine bubble generating device according to claim 3, comprising: a cylindrical lid for circulation; and a front wall portion having a lead-out port. It is made of a magnetic material, and a magnetic circuit is configured with a permanent magnet or exciting coil at an appropriate position such as the outer periphery. The film is released at high speed at the outlet port where the magnetic flux density of the air gap in the magnetic circuit is maximized. The microbubble generator according to any one of claims 1 to 10, which enables generation of electric current to flow in a ring shape in a liquid and has a function of a water heater without interfering with microbubble generation.

  Compared to the high-efficiency micro-bubble generator in the prior art, it can generate a large amount of equal and good micro-bubbles with about half the energy, so the entire micro-bubble generator system can be made compact and cost-effective. .

  Since the energy consumption is lower than that of the prior art products, the running cost is also reduced.

  Further, since the flow of the introduced liquid in the flow path becomes smooth, the vibration becomes low.

  In addition, it is easy to design a highly efficient fine bubble generator in accordance with the flow rate of the supplied liquid.

  Furthermore, the noise can be reduced by shielding the generation of noise at the outlet through a lid and the like, and lowering the pressure of the pump, and the installation place is reduced.

Embodiments of the present invention will be described below.
(Embodiment 1)
1 and 2 show an example of a microbubble generator according to claim 1 of the present invention. 1 is a side sectional view, and FIG. 2 is a sectional view taken along the line AA in FIG. The liquid pressurized from the liquid inlet 106, the liquid in which bubbles are mixed, or the liquid in which the gas is dissolved is introduced toward the pre-revolution chamber 105 and flows smoothly and evenly from the outer periphery of the vane nozzle 104. The flowing liquid becomes a thin strip-like jet and is jetted in the tangential direction of the outer periphery of the main swirl chamber 100. The ejected liquid increases the swirl angular velocity without disturbing swirl from the outer periphery of the main swirl chamber 100 having a cross section in which excessive acceleration is unlikely to occur in the flow velocity toward the outlet port 103 in the inner periphery, It discharges from the outlet 103. In addition, an air column axis is generated on the center line of the main swirl chamber 100, and when released, the gas of the air column axis is drawn by viscosity and is shredded, entrained and crushed, the bubbles are sheared, and a large amount of fine bubbles are generated. Can do.

(Embodiment 2)
FIG. 3 is an example of a microbubble generator according to claim 2 of the present invention. FIG. 3 is a side sectional view. The liquid in which bubbles are mixed and the liquid in which the gas is dissolved, which is pressurized from the liquid inlet 106, is introduced toward the pre-revolving chamber 105, and is smoother and more uniform than the outer periphery of the vane nozzle 104 having an appropriate width. Flow into. The liquid that flows in becomes a thin strip-like jet and is jetted toward the tangential direction of the outer periphery of the main swirl chamber 100. The ejected liquid increases the swirl angular velocity without disturbing swirl from the outer periphery of the main swirl chamber 100 having a cross section in which excessive acceleration is unlikely to be generated to the outlet ports 103 on both sides of the inner periphery. And discharged from two outlets 103. In addition, an air column axis is generated on the center line of the main swirl chamber 100, and when released, the gas in the air column axis is drawn by viscosity and is shredded, crushed and crushed, the bubbles are sheared, and a large amount of fine bubbles are generated. Can do.

(Embodiment 3)
FIG. 4 is an example of a microbubble generator according to claim 3 of the present invention. This is attached immediately after the outlet 103 of the first and second embodiments. FIG. 4 is a side sectional view. The bubble-mixed liquid that is discharged in the form of a film while swirling from the outlet 103 is centrifugally and centripetally, and the small-sized fine bubbles are moved toward the outer periphery and discharged to the outside from the discharge passage. The gas mixed in a large amount approaches the inner circumference, and depending on the negative pressure, passes through the hole 201 of the circulation tubular body 200, flows in the direction of the arrow, is drawn into the outlet port 103 side, and rotates again at high speed. Together with the liquid, bubbles and gas are sheared and refined. In addition, the outside of the hole 201 of the cylindrical body for circulation 200 may be expanded in a conical shape and guided to the hole.

(Embodiment 4)
5, FIG. 6, FIG. 7 and FIG. 8 show an example of the microbubble generator according to claim 4 of the present invention. 5 is a side sectional view, FIG. 6 is a sectional view taken along line BB in FIG. 5, FIG. 7 is a sectional side view, and FIG. 8 is a sectional view taken along line CC in FIG. When the inflow direction and the discharge direction are linear as shown in FIG. 5 or when the inflow direction and the discharge direction are at right angles and are not eccentric as shown in FIG. Guide vanes 300 and 301 are provided for directing the pre-swirl chamber 105 to a direction change or pre-swirl, and the liquid is smoothly supplied to the vane-shaped nozzle 104. In addition, the liquid should be guided evenly.

(Embodiment 5)
9 and 10 show an example of the microbubble generator according to claim 5 of the present invention. 9 and 10 are side sectional views. A fine bubble generating system shown in FIG. 22 is provided with a gas introduction port 400 at a position on the center line of the top of the rear wall 102 of the main swirl chamber 100 and a gas introduction connection port 401 so that gas can be sucked from the outside. Use with etc.

(Embodiment 6)
FIG. 11, FIG. 12, FIG. 13 and FIG. 14 show an example of the microbubble generator according to claim 6 of the present invention. A predetermined space 502 is provided immediately after the high-speed swirling liquid outlet 103 or immediately after the circulation flow path structure of the third embodiment to promote decompression foaming of the cylindrical passage 500 or the cone-shaped flow path 501 on the outer side wall. Provided with a function of reducing the noise by providing a flow path for generating a small amount of fine bubbles.

(Embodiment 7)
15 and 16 show an example of the fine bubble generator according to the seventh aspect of the present invention. Even if fibrous foreign matter that cannot be trapped by the strainer flows in, it passes through without blocking, and it is possible to suppress the deterioration of performance and generate fine bubbles. While maintaining the flow path width W1 of the introduced liquid, the width of the vane-shaped nozzle 510 is decreased, the shape on the inflow side is inclined toward the center, and the trapped foreign matter moves and passes. ing. Further, the vane nozzle 510 having a reduced width can be attached to the front wall side or the rear wall side. Furthermore, a vane-like nozzle 510 with a reduced width can be attached to both the front wall side and the rear wall side, and a gap passing through the center can be provided. In this case, it is preferable that the positional relationship in the rotation direction of the vane-shaped nozzles 510 on the front wall side and the rear wall side is shifted by 360 degrees / 2n (n is the number of vane-shaped nozzles), and the front and rear are alternated.

(Embodiment 8)
FIG. 17 shows an example of a microbubble generator according to claim 8 of the present invention. 4. The fine bubble generating apparatus according to claim 3, further comprising a function for promoting the bubble diameter selection function and the foaming of dissolved gas, and the resistance of the circulation tube of the circulation tube lid 200 to the outer periphery of the circulation tube by a fluid. The cylindrical body 520 having a gap in the radial direction is installed so as to have a flow path area that can be ignored, and the turning remaining force from the outlet is reduced to a maximum so that the turning angular velocity is maximized. The bubble selection function is maximized to guide the large diameter bubble to the circulation hole 201. Furthermore, a second cylindrical body is similarly provided on the outer periphery of the cylindrical body 520, and the dissolved gas dissolved in the introduced liquid is generated by passing the flow path through a zigzag and generating a vortex. Foam. For this purpose, a plurality of slit-like or hole-like flow paths are provided at one end of the cylindrical body 520, or a single or double cylindrical tubular body 520 having a reduced flow path is provided. As for the positions of the slits, holes and gaps, the first is provided on the side opposite to the outlet 103 and the second is provided on the side of the outlet 103. Thereby, more fine bubbles can be generated.

(Embodiment 9)
FIG. 18 shows an example of a microbubble generator according to claim 9 of the present invention. The shape of the rear wall 102 part is changed from Mt. Fuji to a conical rear wall 530, the flow of the vane nozzle inflow part is changed from an acute angle to an obtuse angle, and the flow direction of the outer periphery of the main swirl chamber is to prevent turbulence and reduce frictional resistance. Is a diagonal flow.

(Embodiment 10)
FIG. 19 shows an example of a microbubble generator according to claim 10 of the present invention. In the fine bubble generating device according to claim 3, the cylindrical portion for circulation of the cylindrical lid for circulation 200 is a cylindrical body 550 with a lid, and is separated so as to be movable in the axial direction from the lid rear wall. By the support member having the communication part having flexibility and elasticity, the initial position can pass the gas-liquid in the form of a film containing fine bubbles discharged from the outlet 103 during operation, and the center part of the cylinder Is wider than the minimum interval at which negative pressure is obtained, and is automatically pulled to the outlet 103 side by the negative pressure at the center at the start of operation, and at the position where the minimum interval is reached during operation, Fix this. During normal operation, P1 = P2> P3 is established, and when the foreign object 553 is entangled, P1 = P2 <P3 is established and thrust is applied to the opposite side of the outlet, so that the cylindrical body 550 moves. In this way, the gap is automatically adjusted by the axial thrust due to the pressure difference between the inside and outside of the cylindrical body 550 with a lid, and a blocking prevention function is provided.

(Embodiment 11)
FIG. 20 is an example of a microbubble generator according to claim 11 of the present invention. 4. The fine bubble generating apparatus according to claim 3, wherein the circulating cylindrical lid 200 and the front wall portion including the outlet port 103 are made of a magnetic material, and the permanent magnet 540 or the excitation coil is placed at an appropriate position such as an outer peripheral portion. A magnetic circuit is configured at 541, and a power generation current is caused to flow in a ring shape in a film-like liquid discharged at a high speed at the outlet portion 103 where the magnetic flux density of the air gap of the magnetic circuit is maximized. Made it functional. Further, since the shape is not changed, it is possible without disturbing the generation of fine bubbles.

As an example, the results of an experiment using a commercially available microbubble generator for bathtubs are as follows. The system is as shown in FIG.
The product configuration is for 300L bathtub, power consumption 430W, gas dissolving device outer diameter 115mm height 210mm (patent No. 3929472), fine bubble generator (patent No. 3682286) inflow pressure 0.26MPa, flow rate 12L / min. Fine bubbles were generated in a 300 L bath.
The same level of microbubbles was replaced with the microbubble generator of the present invention, the pump pressure was changed, and the equivalent pressure was examined. As a result, the microbubble generator inflow pressure was 0.20 MPa, the flow rate was 7 L / min, the air supply amount was 700 CC / min, and the power consumption was 260 W.
Here, when the energy input to the microbubble generator is calculated as hydraulic power (L = 0.163QH (in the case of specific gravity 1)), the former is about 51 W and the latter is about 23 W, which is less than half. In addition, noise was reduced by about half, although it was audible.
Furthermore, when the bubble diameter is measured with a microscope and compared with the scale of a clear optical P-100H type glass scale, most of the sizes are 40 to 50 microns as shown in FIG. It can be observed that the quantity is approximately 500,000 / CC (500 million / L).
In addition, the main dimensions of each part of the fine bubble generator used in the experiment include a pre-swirl chamber outer diameter of 35 mm, a vane-shaped nozzle width of 2 mm, nine vane-shaped nozzles, a main swirl chamber outer diameter of 20 mm, a discharge port diameter of 6 mm, a main body The outer diameter is 50 mm, the length is 50 mm, and the shape is a cylindrical passage according to the method shown in FIG. 14, and the comparative prior art is about 45 mm in swirl chamber outer diameter, about 50 mm in outer diameter, and about 100 mm in length. Is half the volume.

  9 and 10 can be used in the system shown in FIG. 22 and other methods can be used in the system shown in FIGS.

Sectional drawing of the side surface of the microbubble generator of Embodiment 1 AA line sectional view in FIG. Sectional drawing of the side surface of the microbubble generator of Embodiment 2 Sectional drawing of the side surface of the microbubble generator of Embodiment 3 Sectional drawing of the side surface of the microbubble generator of Embodiment 4 BB sectional view in FIG. Sectional drawing of the side surface of the microbubble generator of Embodiment 4 CC sectional view in FIG. Sectional drawing of the side surface of the microbubble generator of Embodiment 5 Sectional drawing of the side surface of the microbubble generator of Embodiment 5 Sectional drawing of the side surface of the microbubble generator of Embodiment 6 Sectional drawing of the side surface of the microbubble generator of Embodiment 6 Sectional drawing of the side surface of the microbubble generator of Embodiment 6 Sectional drawing of the side surface of the microbubble generator of Embodiment 6 Sectional drawing of the side surface of the microbubble generator of Embodiment 7 Sectional drawing of the side surface of the microbubble generator of Embodiment 7 Sectional drawing of the side surface of the microbubble generator of Embodiment 8 Sectional drawing of the side surface of the microbubble generator of Embodiment 9 Sectional drawing of the side surface of the microbubble generator of Embodiment 10. Sectional drawing of the side surface of the microbubble generator of Embodiment 11 Fine bubble generation system that introduces gas from the pump suction side Microbubble generation system that introduces gas from microbubble generator High-concentration microbubble generation system with gas dissolving device Microscopic photo of fine bubbles tested in the example (one scale 50 microns) Cross-sectional view of the front of a conventional microbubble generator

Explanation of symbols

100 main swirl chamber 101 front wall 102 rear wall 103 outlet 104 vane nozzle 106 inlet 200 circulation cylindrical lid 201 circulation hole 202 circulation inclined part 300 guide vane 301 guide vane (broken line part)
400 gas introduction port 401 gas introduction connection port 500 cylindrical flow channel 501 conical flow channel 502 space 510 width vane nozzle 520 cylindrical body 530 conical rear wall 540 permanent magnet 541 excitation coil 550 cylinder with lid 551 support portion 552 communication hole 553 foreign material 600 low speed region 601 speed increasing region 700 fine bubble generating device 701 suction pipe 702 pump 703 gas introduction control valve 704 gas dissolving device 705 discharge pipe 710 300 L bathtub or liquid tank 711 for experiment Tank

Claims (11)

  The area obtained by multiplying the circumference of the swirling flow by one circumference and the width of the swirling chamber at each position in the area from the nozzle to the outlet so that no extra acceleration is generated in the swirling flow velocity in the swirling chamber. An intermediate space formed by overlapping the outlines of Mt. Fuji, which are almost the same height, formed in the same way, has a front wall and a rear wall, and the outer periphery is spaced according to the width of the nozzle A main swirl chamber installed at a distance, a liquid outlet for high-speed swirling at a position corresponding to the top of the front wall, and a thin band in the tangential direction of the outer periphery of the swirl chamber, which is installed evenly around the outer periphery of the main swirl chamber Circular vane nozzles with about 10 vane nozzles having a constant speed or speed increasing function for generating a plate-like jet, and so that the liquid is smoothly and evenly guided from the liquid inlet to the vane nozzles on the outer periphery. A fine bubble generator with a pre-swirl chamber molded into a volute shape.   2. The fine bubble generating device according to claim 1, wherein the rear wall is removed and installed back to back so as to be symmetric with respect to the surface. As a result, there are two outlets, the directions of the vane nozzles are unified, The space in the main swirl chamber with a single inlet is a fine bubble generator having the shape of the outline of the impeller of both suction centrifugal pumps.   In a swirl type fine bubble generator, a large number of sheared bubbles are selectively sheared again immediately after the outlet of the liquid that swirls at high speed. Install a lid with a cylindrical body whose inner diameter is the same as that of the outlet, or a lid with the cylindrical body that is enlarged conically outside the hole, and discharge from the outlet. A function to reduce noise by providing a circulation channel installed at a minimum interval that allows gas-liquid in the form of a film containing fine bubbles to pass through, and the center of the cylinder to have negative pressure. The main body addition apparatus provided, and the fine bubble generating apparatus of Claim 1 thru | or 2 provided with this.   The fine bubble generating device according to any one of claims 1 to 3, further comprising a guide vane between the liquid introduction port and the pre-swirl chamber for imparting a pre-swirl to the liquid.   5. The generation of fine bubbles according to claim 1 and 3 to 4, wherein a gas introduction port is provided at a position on the center line of the top of the rear wall of the main swirl chamber, and a flow path is provided so that gas can be sucked from the outside. apparatus.   Immediately after the outlet of the liquid that swirls at high speed or immediately after the circulation flow path structure of claim 3, a predetermined space is provided, and a flow path that promotes decompression foaming in a cylindrical or corn shape is provided on the outer side wall, The fine bubble generating device according to any one of claims 1 to 5, comprising a function of reducing noise.   In the fine bubble generator according to claim 1 and claim 2, in the case of claim 1, the distance between the front wall and the rear wall is maintained, and in the case of claim 2, the distance between the front walls is maintained, The fine bubble generating device according to any one of claims 1 to 6, wherein a width of the vane nozzle is reduced, and a gap is provided on the front wall side, the rear wall side, or in the middle so that foreign matters can easily pass therethrough.   4. The microbubble generator according to claim 3, wherein a predetermined gap is provided in a radial direction on an outer periphery of the circulation cylindrical portion of the circulation cylindrical lid, and a plurality of slit-like and hole-like flow paths are provided at one end thereof. Or a cylindrical body incorporating a single or double cylindrical air bubble selective strengthening function and a function of promoting foaming of dissolved gas with a shortened flow path portion. Fine bubble generator.   The fine bubble generator according to claim 1, wherein the shape of the rear wall portion is changed from Mt. Fuji to a conical shape, and the flow direction of the outer peripheral portion of the main swirl chamber is a diagonal flow. Fine bubble generator.   4. The microbubble generator according to claim 3, wherein the circulation cylindrical portion of the circulation cylindrical lid is formed as a cylindrical body with a lid, separated from the rear wall so as to be movable in the axial direction, and flexible. By the support member with the elastic communicating part, the initial position can pass the gas-liquid in the form of a film containing fine bubbles discharged from the outlet port during operation, and the central part of the cylinder is negative pressure It is wider than the minimum interval and is automatically pulled to the outlet side by the negative pressure at the center at the start of operation, and is fixed at the position that becomes the minimum interval during operation. The fine bubble generating device according to any one of claims 1 to 9, wherein a gap is automatically adjusted by an axial thrust due to a pressure difference between an inner side and an outer side of a cylindrical body with a lid, and a blocking prevention function is provided.   4. The microbubble generator according to claim 3, wherein the cylindrical cover for circulation and the front wall portion having the outlet are made of a magnetic material, and a magnetic circuit is formed by a permanent magnet or an exciting coil on the outer periphery or the like. The generator current is made to flow in the form of a ring in the film-like liquid discharged at a high speed at the outlet portion where the magnetic flux density of the air gap of the magnetic circuit is maximized, thereby providing an active water function. The fine bubble generator as described in thru | or 10.

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