JP2010075838A - Bubble generation nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bubble generation nozzle capable of saving energy by efficiently generating a large quantity of fine bubbles. <P>SOLUTION: A bubble generation apparatus 1 includes a second gas mixing chamber 23b of a second body 23 for generating bubbles by mixing pressurized water and ozone, a square spring 27 for generating a swirling current from the pressurized water mixed with bubbles, a first gas mixing chamber 22b for producing bubble-mixed water containing fine bubbles by mixing a gas with the swirling current of the pressurized water and hitting and splitting bubbles from the second gas mixing chamber 23b, a conical coil spring 26 for generating a swirling current from bubble-mixed water, a pressurizing part 25 of which the diameter of the inner circumferential wall face is reduced toward the water flow direction to pressurize the bubble-mixed water, and a nozzle chip end 21 of which the diameter of the inner circumferential wall face is widened toward the water flow direction. Fine bubbles are generated due to cavitation caused by passing the pressurized water from the pressurizing part 25 to the nozzle chip end 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bubble generating nozzle capable of efficiently generating a large amount of fine bubbles.

  Fine bubbles called microbubbles or nanobubbles are used in various fields. For example, by sterilizing underwater viruses and bacteria by generating microbubbles with ozone, purify ponds, reservoirs, and aquaculture tanks, or flow air microbubbles from near the bow of the hull toward the stern Thus, a wide variety of utilization examples are known, such as reducing the frictional resistance between the hull and seawater to save fuel.

  A conventional bubble generating nozzle that generates such fine bubbles is described in Patent Document 1. The loop flow type bubble generating nozzle described in Patent Document 1 is provided with a cylindrical member having a gas inflow hole at a side portion for allowing gas to flow in, and one end of the cylindrical member. A cylindrical member having a liquid supply hole provided in the center and having a liquid supply hole for supplying a pressurized liquid to the middle of the cylindrical member. A substantially cylindrical space surrounded by the disk member is provided as a gas-liquid loop flow type stirring and mixing chamber.

  In this conventional bubble generating nozzle, the gas flowing in from the gas inflow hole is stirred and sheared by the high-speed loop flow in the gas-liquid loop flow type stirring and mixing chamber and collides with the pressurized liquid supplied from the liquid supply hole. Then, it is subdivided by the turbulent flow generated at the time, and further collides with the external gas and external liquid that have flowed into the ejection hole, and is fined and ejected from the ejection hole as a mixed fluid containing microbubbles.

JP 2008-119623 A

  In this conventional bubble generating nozzle, gas that becomes microbubbles is mainly introduced from the gas inflow holes. However, in order to increase the amount of fine bubbles generated, it is necessary to increase the amount of gas flowing in from the gas inflow hole, but simply increasing the diameter of the gas inflow hole or inflowing liquid into the liquid supply hole There is a difficult aspect just by increasing the amount.

  The bubble generation nozzle is desired to be capable of generating bubbles more finely and in large quantities. This is because if the bubbles are fine, the residence time in water is long, and it is easy to dissolve in water. In particular, if the purpose of use of the bubble generating nozzle is to improve water quality such as sterilization or purification using ozone, ozone is hardly soluble in water. By generating bubbles, the amount dissolved in water can be increased.

  If a large amount of fine bubbles can be generated compared to the conventional one, the bubble generation nozzle can reduce the flow rate when the amount of bubbles is the same, so the power of the power source such as a pump can be reduced and energy saving can be achieved. be able to.

  Therefore, an object of the present invention is to provide a bubble generation nozzle capable of saving energy by efficiently generating a large amount of fine bubbles.

  The bubble generating nozzle of the present invention includes a first gas mixing unit that generates bubbles by mixing a gas with pressurized water, and a second gas mixing unit that generates a bubble mixed water by further mixing a gas with the pressurized water mixed with the bubbles. And a diameter-reducing portion that pressurizes the bubble-mixed water, and a diameter-expanded portion that is connected to the downstream side of the diameter-reduced portion and depressurizes the pressurized bubble-mixed water.

  The bubble generating nozzle of the present invention includes two bubble mixing portions, a first bubble mixing portion and a second bubble mixing portion. First, gas is mixed with pressurized water in a 1st gas mixing part. Furthermore, gas is mixed as bubble mixed water in the second bubble mixing unit. Some of these mixed gases dissolve in pressurized water. The bubble-mixed water is further pressurized at the reduced diameter portion and is reduced at once at the expanded diameter portion. By doing so, microbubbles are generated by the action of cavitation, and the generated microbubbles impact and destroy the bubbles mixed by the first bubble mixing section, thereby forming microbubbles. Therefore, since the air bubbles mixed by the first air bubble mixing portion located on the upstream side of the second gas mixing portion can also be made into fine air bubbles, a large amount of fine air bubbles can be generated.

  When a water flow swirling unit that swirls pressurized water from the first gas mixing unit to the second mixing unit is provided, the water flow becomes a swirling flow while flowing from the first gas mixing unit to the second mixing unit. Therefore, the impact can be further increased by the collision of the bubbles.

  When the water diameter swirling means using the bubble mixed water as a swirling flow is provided in the reduced diameter portion, it is possible to increase the chance of collision between bubbles by rotating the bubble mixed water while applying pressure. it can.

  The water flow swirl means may be a coil spring formed in a spiral shape along the inner peripheral wall surface. If it is a coil spring, not only can it be easily procured, but the water flow can be made a swirl flow, and the water flow and swirl flow on the axis are mixed to form a turbulent flow. The impact can be further increased.

  The coil spring is preferably provided so as to be rotatable about an axis in the pipe. When the coil spring is provided so as to be rotatable about the axis in the pipe, the coil spring rotates by the force of the water flow, so that the complexity of the turbulent flow can be increased.

  The water swirl means may be a groove formed in a spiral shape along the inner peripheral wall surface. By making the water flow swirl means a spiral groove, it is not necessary to prepare a coil spring or the like, so the number of parts can be reduced. Therefore, the component cost can be suppressed and the device can be easily manufactured.

  The bubble generating nozzle of the present invention can generate a large amount of fine bubbles by making the bubbles mixed by the first bubble mixing portion located upstream of the second gas mixing portion into fine bubbles, thus saving energy. Can be achieved.

A bubble generator according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a bubble generating apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the bubble generating nozzle shown in FIG. FIG. 3 is an exploded view of the bubble generating nozzle shown in FIG.

  As shown in FIG. 1, the bubble generating device 1 generates ozone fine bubbles to purify sewage from a water purification plant. The bubble generating device 1 includes a bubble generating nozzle 2 for injecting microbubbles and nanobubbles, an ozone generating device 3 for supplying ozone to the bubble generating device 1, and a pump 4 for taking water and supplying pressurized water to the bubble generating device 1. And.

  As shown in FIGS. 2 and 3, the bubble generating nozzle 2 includes a nozzle tip 21, a first main body 22, and a second main body 23.

  The nozzle tip 21 is inserted into the tip mounting hole 22 a on the downstream side of the first main body 22. Since the pipe 21a of the nozzle tip 21 is a diameter-expanded pipe whose diameter gradually increases as it goes in the direction of water flow, it functions as a diameter-expanded section.

  The first main body 22 includes a tip end mounting hole 22a in which the nozzle tip 21 is mounted at one end on the downstream side, and a first gas mixing chamber 22b (second gas mixing portion) in which ozone and water are mixed. ) And an introduction path 22c for guiding the water flow to the first gas mixing chamber 22b. The first gas mixing chamber 22b and the tip mounting hole 22a communicate with each other through a connection path 22d that is smaller than the inner diameter thereof.

  The first gas mixing chamber 22b is provided with a first suction hole 22e for mixing ozone in the inner peripheral wall surface, and the first suction hole 22e is a first suction hole for connecting a hose from the ozone generator 3. The first connection portion mounting hole 22f for mounting the one connection portion 24 communicates with the first connection portion mounting hole 22f.

  The first gas mixing chamber 22b is internally provided with a pressurizing unit 25 provided with an injection hole 25a having a diameter substantially the same as that of the connection path 22d on the downstream side. The pressurizing part 25 functions as a reduced diameter part by using a reduced diameter pipe that gradually decreases in diameter from the inlet side toward the outlet side that becomes the injection hole 25a.

The pressurizing unit 25 is provided with a conical coil spring 26 that functions as a water swirling means and that decreases in diameter from the inlet side toward the outlet side.
In addition, an angular spring 27, which is a coil spring having a rectangular cross-sectional shape that functions as a water flow swirling means, is also disposed in the introduction path 22 c with a small-diameter O-ring 28 interposed between it and the conical coil spring 26.

  The other end of the first main body 22 is inserted into a main body connection hole 23 a provided at one end on the downstream side of the second main body 23. When the first main body portion 22 is inserted into the second main body portion 23, the first main body portion 22 is attached to the second main body portion 23 with a large-diameter O-ring 29 interposed therebetween.

The second main body portion 23 is provided with a second gas mixing chamber 23b (first gas mixing portion) in which ozone and water are mixed. The second gas mixing chamber 23 b is provided with a second suction hole 23 c for mixing ozone in the inner peripheral wall surface, and the second suction hole 23 c is a second connection for connecting a hose from the ozone generator 3. The second connecting portion mounting hole 23d for mounting the portion 30 is communicated with. A third connection portion mounting hole 23e for mounting a third connection portion 31 (not shown in FIG. 3) for connecting a hose from the pump 4 to the other end portion of the second main body portion 23. Is provided.
In the present embodiment, the second suction hole 23c is formed smaller than the first suction hole 22e. This is because the amount of ozone sucked from the second suction hole 23c does not become excessive, but if it is insufficient, it may be the same size or larger.

The use state of the bubble generator according to the embodiment of the present invention configured as described above will be described with reference to the drawings.
As shown in FIG. 1, first, the pump 4 is started together with the ozone generator 3. Pressurized water from the pump 4 flows into the second gas mixing chamber 23 b of the second main body 23 from the third connection portion 31.
In the second gas mixing chamber 23b, a negative pressure is generated with respect to the second suction hole 23c by the inflowing pressurized water, and ozone is bubbled through the second connection portion 30 due to the supply of ozone from the ozone generator 3. Mixed.

The ozone bubbles that have entered the second gas mixing chamber 23b from the second suction hole 23c via the second connection portion 30 are conveyed to the introduction path 22c of the first main body portion 22 by the pressurized water. The pressurized water is accelerated by proceeding into the angular spring 27 having an inner diameter smaller than that of the second gas mixing chamber 23b. The pressurized water becomes a turbulent flow due to the flow on the axis of the angular spring 27 and the swirling flow generated by flowing along the spiral of the angular spring 27, and the first gas mixing chamber 22b in which the pressurized portion 25 is located. To flow. In addition, ozone bubbles are also transported to the turbulent flow through the angular spring 27.
Since the square spring 27 has a rectangular cross-sectional shape, it is easy to induce pressurized water into the swirling flow. Therefore, it is possible to obtain a turbulent flow with a large degree of change by merging with the flow along the axis of the angular spring 27. At this time, if the angular spring 27 is provided so as to be rotatable about the axis in the pipe of the second main body 23, the angular spring 27 is rotated by the momentum of the water flow, so that the complexity of the turbulent flow is increased. it can.

  In the first gas mixing chamber 22b, a negative pressure is generated with respect to the first suction hole 22e by the inflowing pressurized water, and ozone is supplied to the pressurizing unit via the first connection unit 24 by the supply of ozone from the ozone generator 3. 25 is mixed into air bubbles.

  Pressurized water that has become turbulent by passing through the angular spring 27 is further accelerated by flowing into the pressurizing section 25 having a smaller diameter than the inner diameter of the angular spring 27. The pressurized water that has flowed into the pressurizing unit 25 is pressurized as the inner peripheral wall surface of the pressurizing unit 25 is gradually reduced in diameter, and the cone disposed along the inner peripheral wall surface of the pressurizing unit 25. The coil spring 26 further induces a swirl flow.

  By being guided to the swirl flow by the conical coil spring 26, the degree of change becomes a turbulent flow. Bubbles from the second gas mixing chamber 23b flowing along with the turbulent flow are broken into fine bubbles by colliding violently with the bubbles mixed in the first gas mixing chamber 22b. The pressurized water that has become the bubble mixed water by including the fine bubbles and the bubbles mixed in the first gas mixing chamber 22b enters the connection path 22d. In the present embodiment, the conical coil spring 26 has a circular cross-sectional shape. However, it is preferable to use a rectangular coil spring 26 because the water flow can be easily guided to the swirl flow. However, when the manufacturing cost increases or the ease of procurement is taken into consideration, the conical coil spring 26 may have a circular cross-sectional shape.

  Then, when flowing into the nozzle tip 21 from the connection path 22d and passing through the pipe path 21a formed with an enlarged diameter, air or ozone dissolved in the bubble mixed water is precipitated by the cavitation action by being depressurized at once. Fine bubbles called microbubbles are generated. In addition, bubbles mixed in the first gas mixing chamber 22b and bubbles remaining in a large particle size without colliding with the bubbles mixed in the second gas mixing chamber 23b and mixed in the first gas mixing chamber 22b It breaks up into microbubbles by the impact of the Kyobitation action.

  As described above, not only the ozone mixed in the first gas mixing chamber 22b using the cavitation action is made into fine bubbles, but also the ozone mixed in the second gas mixing chamber 23b is converted into the first gas mixing chamber. Since it can be divided into fine bubbles by impact when it collides with the ozone mixed in 22b, a large amount of fine bubbles can be generated. Further, since the bubbles remaining with a large particle size even after passing through the first gas mixing chamber 22b can be broken by the impact of the cavitation action, more fine bubbles can be generated.

  The fine bubbles of ozone can increase the residence time in water as compared with those having a large particle size, so that the amount of dissolution increases. Therefore, the amount of dissolution can be increased by generating a large amount of fine bubbles in water even if it is ozone having poor solubility. Therefore, the bubble generating device 1 according to the present embodiment reduces the electric energy of the ozone generating device 3 and the pump 4 if the same amount of dissolution is to be obtained as compared with the conventional bubble generating device. Can save energy.

  In the present embodiment, ozone is used as the fine bubbles, but it can be simply air or other gases. In addition to water, sewage, and seawater, other liquids can be used.

  Next, a modified example of the bubble generating nozzle according to the embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a cross-sectional view showing a first modification of the bubble generation nozzle used in the bubble generation device according to the embodiment of the present invention. FIG. 5 is a cross-sectional view showing a second modification of the bubble generating nozzle used in the bubble generating apparatus according to the embodiment of the present invention. FIG. 6 is a cross-sectional view showing a third modification of the bubble generating nozzle used in the bubble generating apparatus according to the embodiment of the present invention. 4 to 6, the same components as those in FIG. 2 are denoted by the same reference numerals and description thereof is omitted.

First, a 1st modification is demonstrated based on FIG.
As shown in FIG. 4, the second main body 23 is provided with an L-shaped tube 32 extending from the second suction hole 23c to the center of the second gas mixing chamber 23b. The tip of the L-shaped tube 32 extends toward the axis (center) of the angular spring 27 through which pressurized water flows most quickly.
Since such an L-shaped tube 32 is provided, the bubbles from the L-shaped tube 32 flow straight on the axis of the angular spring 27 and the conical coil spring 26 along the flow of pressurized water, and thus are most accelerated. Is done. Therefore, since the degree of impact due to collision with the bubbles mixed from the first suction hole 22e can be increased, fine bubbles can be obtained by vigorously inducing splitting due to the impact.

Next, a second modification will be described based on FIG.
As shown in FIG. 5, in the second main body portion 23x, four wall surface suction holes 23f are equally arranged on the inner peripheral wall surface of the second gas mixing chamber 23b. The wall surface suction hole 23f is inclined in the same spiral direction as the angular spring 27 shown in FIG. The wall surface suction hole 23f communicates with an annular air passage 23g formed along the inner peripheral wall surface of the second gas mixing chamber 23b, and communicates with the second suction hole 23c. 2) passes through the second suction hole 23c, the air passage 23g, and the wall surface suction hole 23f in this order, and flows into the second gas mixing chamber 23b.

  The sucked ozone is swung by the angular spring 27 and turbulent because the wall suction hole 23f is inclined in the same spiral direction as the angular spring 27 and is evenly arranged on the inner peripheral wall surface. It becomes easy to be evenly dispersed in the pressurized water. Accordingly, the ozone bubbles are dispersed in a turbulent flow and advanced to the pressurizing unit 25, so that the bubbles that flow into the first gas mixing chamber 22b from the first suction hole 22e collide more violently and improve the impact level. By preventing them from becoming a lump, the chance of bubbles colliding can be increased.

Further, a third modification will be described with reference to FIG.
As shown in FIG. 6, the first main body portion 22x has a reduced diameter portion by reducing the diameter of the first gas mixing chamber 22b from the inlet side toward the outlet side serving as the injection hole 25a. The pressurizing part (see FIG. 2) that functions as is omitted. Further, the conical coil spring 26 is omitted by providing a spiral groove 22g on the inner peripheral wall surface of the first gas mixing chamber 22b to function as a water flow swirl means.
Furthermore, a spiral groove 22h is provided on the inner peripheral wall surface of the introduction passage 22c of the first main body portion 22x, and the angular spring 27 is omitted by functioning as a water flow swirl means.

Thus, even if the spiral grooves 22g and 22h are provided on the inner peripheral wall surface instead of the coil spring as the water flow swirling means, the pressurized water from the second main body portion 23 is caused to flow along the spiral grooves 22g and 22h. Thus, the pressurized water can be guided to the swirling flow to be a turbulent flow.
Further, by providing the spiral grooves 22g and 22h on the inner peripheral wall surface, the conical coil spring 26 and the square spring can be omitted, so that the number of parts can be reduced. Therefore, the component cost can be suppressed and the device can be easily manufactured.

  Since the present invention can eject a large amount of fine bubbles together with a liquid, it can be used for aeration in water or mounted in a shower head. In particular, it is optimal for purification of sewage by releasing fine bubbles of ozone in water.

It is the schematic which shows the bubble generator which concerns on embodiment of this invention. It is sectional drawing of the bubble generation nozzle shown in FIG. It is an exploded view of the bubble generation nozzle shown in FIG. It is sectional drawing which shows the 1st modification of the bubble generation nozzle used for the bubble generation apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the 2nd modification of the bubble generation nozzle used for the bubble generation apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the 3rd modification of the bubble generation nozzle used for the bubble generation apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bubble generator 2 Bubble generating nozzle 21 Nozzle tip part 21a Pipe line 22 1st main-body part 22a Tip part installation hole 22b 1st gas mixing chamber 22c Introduction path 22d Connection path 22e 1st suction hole 22f 1st connection part installation hole 22g , 22h Groove 23, 23x Second body portion 23a Body portion connection hole 23b Second gas mixing chamber 23c Second suction hole 23d Second connection portion mounting hole 23e Third connection portion mounting hole 23f Wall suction hole 24 First connection portion 25 Pressure unit 25a Injection hole 26 Conical coil spring 27 Square spring 28 Small-diameter O-ring 29 Large-diameter O-ring 30 Second connection portion 31 Third connection portion 32 L-shaped tube 3 Ozone generator 4 Pump

Claims (6)

A first gas mixing section that mixes gas with pressurized water to generate bubbles;
A second gas mixing section for further mixing a gas with the pressurized water mixed with the bubbles to generate bubble mixed water;
A reduced diameter portion for pressurizing the bubble mixed water;
A bubble generating nozzle provided with a diameter-enlarged portion connected to the downstream side of the reduced-diameter portion and depressurizing pressurized bubble-mixed water.   The bubble generating nozzle according to claim 1, further comprising a water flow swirling unit that swirls pressurized water from the first gas mixing unit to the second mixing unit.   The bubble generating nozzle according to claim 1, wherein a water flow swirling means for swirling the bubble mixed water is provided in the reduced diameter portion.   The bubble generating nozzle according to claim 2 or 3, wherein the water swirl means is a spiral coil spring provided along an inner peripheral wall surface.   The bubble generating nozzle according to claim 4, wherein the coil spring is provided so as to be rotatable about an axis in the pipe.   The bubble generating nozzle according to claim 2 or 3, wherein the water flow swirling means is a groove formed in a spiral shape along an inner peripheral wall surface.

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