JP2007330939A - Fine air bubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more efficiently and certainly produce air bubbles. <P>SOLUTION: A jet orifice 11a, of which the diameter is larger than the caliber of a liquid jet nozzle 20 and larger than the diameter of the liquid droplet 41 ejected from the liquid jet nozzle 20, is opened on the same axial line as the axial line of the liquid jet nozzle 20 and a guide tube 20 communicating with the jet orifice 11a on the same axial line is provided in a protruded state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides oxygen supplementation for marine aquaculture facilities, floating of deep water, purification of large dams, supplementation of oxygen into high viscosity liquids, fluid agitation by bubble injection, promotion of microbial degradation during livestock manure treatment, The present invention relates to a foam separation apparatus using fine bubbles, a mixture of a specific gas and a liquid, a fine bubble generator used for sterilization of seawater or liquid using ozone gas, and the like.

As prior art document information related to the fine bubble generator of the present invention, for example, there is Patent Document 1 below.
JP 2001-252546 A

The exemplified fine bubble generator described in Patent Document 1 includes a gas chamber that forms a space that can be filled with gas, a liquid ejection nozzle that ejects liquid pressurized outside the gas chamber, and A gas introduction pipe communicating with the outside of the gas chamber is provided to introduce gas into the gas chamber.
Also, an ejection hole plate that forms a front surface portion of the gas chamber is provided in front of the tip of the liquid ejection nozzle, and the liquid ejected from the liquid ejection nozzle is provided in the ejection hole plate. A single jet hole is formed corresponding to the jet direction of the liquid jet nozzle so as to attract the gas and jet into the liquid outside the gas chamber.

The fine bubble generator attracts the gas filled in the gas chamber by the liquid ejected from the liquid ejecting nozzle and passes through the ejection hole at high speed while mixing the attracted gas. Since the gas chamber has a negative pressure due to the ejection of gas, the external gas is sucked into the gas chamber by the gas introduction tube, and thus, the liquid and gas are ejected from the ejection hole and the gas is sucked and introduced by the gas introduction tube. And is being carried out continuously.
Further, in the above process, the gas in the gas chamber is attracted by the liquid ejected from the liquid ejecting nozzle and accelerated rapidly, and a part of the gas is mixed in the ejected liquid to become a gas-liquid mixed flow, It passes through the hole at high speed.
Therefore, if the outside of the ejection hole is exposed to the liquid, the collision between the ejected gas and the liquid particles in the liquid, the collision between the gas-liquid mixed flow and the liquid particles, and the like occur in the vicinity of the ejection hole outlet. Due to these collision actions, a large amount of fined bubbles are generated and a part of the bubbles is dissolved in the liquid.

By the way, in order to generate bubbles effectively, it is important that the liquid ejected from the liquid ejecting nozzle efficiently attracts air to the gas chamber and fills the gas chamber.
In order to efficiently attract the air to the gas chamber and fill the gas chamber, it is necessary to suppress water infiltration into the gas chamber due to water pressure.
For example, when used at a deep water depth, the gas chamber is liable to be submerged due to the water pressure that increases with the water depth. Therefore, the diameter of the ejection hole and the liquid ejection nozzle are reduced by reducing the diameter of the ejection hole. By reducing the diameter difference from the diameter, the interval between the outer periphery of the liquid to be ejected and the edge of the ejection hole is narrowed to suppress water immersion due to water pressure.
However, when the diameter of the ejection hole is reduced as described above, the diameter of the liquid ejected from the liquid ejection nozzle may be equal to or larger than the diameter of the ejection hole, and if the diameter on the tip side of the liquid is equal to or larger than the diameter of the ejection hole, the liquid is ejected. When the liquid comes into contact with the ejection holes and the periphery of the ejection holes, the water flow is disturbed, which affects the generation of bubbles and the attraction of air, and the generation of bubbles may become inefficient.

For this reason, the distance between the tip of the liquid ejection nozzle and the ejection hole is shortened, and the liquid is ejected from the ejection hole before the diameter on the distal end side of the ejected liquid becomes equal to or larger than the ejection hole diameter. I try to make a water stream.
However, when the distance between the tip of the liquid jet nozzle and the ejection hole is shortened as described above, the time for attracting air in the gas chamber is shortened. May decrease.
As a result of earnest research on the fine bubble generator from the viewpoint of more efficiently and reliably generating fine bubbles, the present applicant has arrived at the present invention.

  Then, this invention makes it a subject to generate a fine bubble more efficiently and reliably, and aims at provision of the fine bubble generator which solves this subject.

  In order to achieve the above-mentioned object, the technical means adopted by the present invention include a gas chamber having a space into which a gas is introduced, and a liquid that is attached to the gas chamber and ejects the liquid into the gas chamber toward the front thereof. The injection nozzle includes a gas introduction pipe for introducing gas into the gas chamber, and a front surface of the gas chamber has an ejection hole through which the liquid ejected from the liquid ejection nozzle and the gas in the gas chamber pass. A guide pipe that is opened on the coaxial line with the axial line and that communicates with the jet hole on the coaxial line protrudes, and the jet hole has a diameter larger than the jet port diameter of the liquid jet nozzle, and the jet hole The diameter is larger than the diameter of the passing liquid, and the guide tube has a diameter larger than that of the ejection hole.

  The ejection hole having a diameter larger than the diameter of the liquid ejection nozzle in the present invention and larger than the diameter of the liquid ejected from the ejection nozzle is the distance between the ejection hole and the tip of the liquid ejection nozzle. Regardless, it is an ejection hole having a diameter that allows the liquid ejected from the ejection nozzle to pass through the ejection hole without contacting the edge of the ejection hole or around the ejection hole.

  The inner diameter of the guide tube is preferably 2 to 3 times the diameter of the ejection hole, and the total length of the guide tube is preferably 5 times the inner diameter of the guide tube.

  According to the fine bubble generator of the present invention, fine bubbles can be generated more efficiently and reliably.

Hereinafter, the best mode for carrying out the fine bubble generator of the present invention will be described with reference to the drawings.
The fine bubble generator A according to this embodiment includes a gas chamber 10 that can be filled with a gas 42, a liquid injection nozzle 20 in which an injection tip is located in the gas chamber 10, and a gas that communicates with the gas chamber 10. An introduction pipe 30 is provided so that the liquid 41 ejected by the liquid ejection nozzle 20 is ejected to the outside through the ejection hole 11a in the front portion of the gas chamber 10.

  The gas chamber 10 includes a cylindrical main body 12 that is open at the front and rear, an ejection hole plate 11 that is attached so as to close a front opening of the cylindrical main body 12, and a rear opening of the cylindrical main body 12. A space S that is attached so as to be closed and includes a nozzle adapter 13 in which the liquid jet nozzle 20 is fixed in a substantially axial shape. Forming.

The ejection hole plate 11 is a disk-shaped member having an external thread portion (not shown) on the outer peripheral surface, and the liquid 41 ejected from the liquid ejection nozzle 20 attracts the gas 42 in the gas chamber 10 and is outside the gas chamber 10. An ejection hole 11 a is formed so as to be coaxial with the axis of the liquid ejection nozzle 20.
In addition, a guide pipe 11b coaxial with the jet hole 11a is projected in front of the jet hole plate 11 so as to guide the jet of liquid 41 and gas 42 passing through the jet hole to the outside of the gas chamber. .
The ejection hole plate 11 configured as described above is attached to the front-side opening of the cylindrical main body 12 through an airtight means such as a sealant on the outer peripheral male screw portion.

  The nozzle adapter 13 has a substantially cylindrical shape, and closes the rear-side opening of the cylindrical body 12 with the liquid jet nozzle 20 having a jet front end facing forward in the interior thereof fixed on the axis. Is fixed.

The size relationship between the diameter of the ejection port 20a in the liquid ejection nozzle 20, the diameter of the ejection hole 11a, and the inner diameter of the guide tube 11b is such that the diameter of the ejection hole 11a is larger than the diameter of the ejection port 20a. The size relationship is such that the inner diameter of the guide tube 11 b is larger than the diameter of the ejection hole 11.
The ejection hole 11a has a diameter that allows the liquid 41 to pass through without contacting the edge of the ejection hole 11a or around the ejection hole 11a when the ejected liquid 41 passes through the ejection hole 11a. By doing so, the disturbance of the water flow due to the contact of the liquid 41 is prevented, and air can be attracted and bubbles can be generated efficiently.

The ejection hole plate 11 may be airtightly fixed to the cylindrical main body 12 by means such as welding or fitting, but the diameter of the ejection hole 11a may be changed or the thickness of the ejection hole plate 11 may be changed. In order to facilitate modification, maintenance in the cylindrical main body 12, etc., it is preferably fixed by means such as those described above.
The means for fixing the liquid jet nozzle 20 in the nozzle adapter 13 and the means for fixing the nozzle adapter 13 to the cylindrical main body 12 can be any means such as screwing, fitting or welding as long as the airtightness inside and outside the gas chamber 10 can be secured. May be used.

  The liquid injection nozzle 20 is a nozzle having an injection hole 20a with a reduced diameter at the front end side, and is supplied with a pressurized liquid 41 from a liquid supply pipe 21 connected to an intake opening on the rear end side. The liquid 41 is ejected from the tip of the ejection hole 20a into the ejection hole 11a of the ejection hole plate 11.

  A pump 22 is provided at the rear end of the liquid supply pipe 21, and the pump 22 sucks liquid from the liquid or the like that generates bubbles 42 a, and the liquid is ejected from the liquid supply pipe 21 through the liquid supply nozzle 21. 20 to pressurize.

The gas introduction pipe 30 includes an introduction pipe 31 fixed in a penetrating manner to the peripheral wall of the cylindrical main body 12 and an extension pipe 32 connected to the rear end of the introduction pipe 31. So that the inside of the gas chamber 10 communicates with the outside air.
An adjustment valve 33 is provided at the rear end of the extension pipe 32 of the gas introduction pipe 30. The adjustment valve 33 adjusts the flow rate of the gas 42 introduced into the gas chamber 10 to adjust the amount and size of the generated bubbles 42a.

According to the fine bubble generator A of the said form, the ejection hole 11a is made to face the liquid L in the state where the gas 42 is filled in the gas chamber 10, and the liquid 41 is ejected from the liquid ejection nozzle 20 to eject the ejection hole 11a. The gas 42 in the gas chamber 10 is attracted to the liquid 41 ejected from the liquid ejecting nozzle 20, and the attracted gas 42 and the mixed flow of the attracted gas 42 and the ejected liquid 41. Passes through the ejection hole 11a and is ejected into the liquid L through the guide tube 11b.
At that time, since the space S in the gas chamber 10 becomes negative pressure by the ejection of the gas 42, the external gas 42 is sucked into the gas chamber 10 by the gas introduction pipe 30.
Therefore, the ejection of the gas 42 and the liquid 41 from the ejection hole 11a and the suction of the gas by the gas introduction pipe 30 are continued.

Further, when the mixed flow of the gas 42 and the injected liquid 41 passes through the injection hole 11a and is injected into the guide tube 11b, the vicinity of the outlet of the injection hole 11a becomes negative pressure due to the force of the injection, Since the water pressure acting in the direction of the ejection hole 11a is substantially reduced, the gas 42 attracted into the gas chamber 10 is likely to exit from the ejection hole 11a.
That is, the negative pressure generated in the vicinity of the outlet of the ejection hole 11a reduces the influence of the water pressure acting in the direction of the ejection hole 11a, so the amount of the gas 42 ejected from the ejection hole 11a together with the liquid 41 increases.
Furthermore, since the diameter of the ejection hole 11a can be increased by reducing the influence of the water pressure, the amount of the gas 42 can be increased by increasing the diameter of the ejection hole 11a.

  The gas 42 ejected into the liquid L and the mixed flow of the gas 42 and the liquid 41 are refined by colliding with the liquid particles in the liquid L, and a large amount of fine bubbles 42a are generated. Further, since the gas 42 and the gas 42 and the liquid 41 are released into the liquid L at a high speed, a large amount of fine bubbles 42a are diffused widely, and a part of the bubbles 42a is dissolved in the liquid L. The

  Further, since the fine bubble generator A having the above-described structure has a structure in which the ejection hole plate 11 is detachable, the diameter of the ejection hole 11a can be changed by changing the ejection hole plate 11, or the thickness of the ejection hole plate 11 can be changed. It is easy to change the length (that is, the length of the ejection hole 11a), and the generation amount and size of the bubbles 42a can be adjusted by these changes.

The inner diameter of the guide tube 11b is two to three times the diameter of the ejection hole 11a, and the total length of the guide tube 11b is five times the inner diameter of the guide tube 11b.
This is because, when the inner diameter of the guide pipe 11b exceeds the above-mentioned preferable value, the water pressure acting on the ejection hole 11a increases, so the flow rates of the liquid 41 and the gas 42 in the guide pipe 11b decrease, and the ejection hole 11a. When the negative pressure force generated near the outlet of the guide pipe 11b is insufficient and the inner diameter of the guide pipe 11b is less than the preferred value, the water pressure in the guide pipe 11b is caused by the pressure of the liquid 41 and the gas 42 ejected to the guide pipe 11b. This is because the negative pressure force generated in the vicinity of the outlet of the ejection hole 11a becomes insufficient due to the rise of the bubble, and in any case, bubbles cannot be generated efficiently.

  Further, when the total length of the guide pipe 11b exceeds the preferable value, the flow rates of the liquid 41 and the gas 42 in the guide pipe 11b are reduced, and the negative pressure force generated near the outlet of the ejection hole 11a is insufficient. When the total length of the guide tube 11b is less than the preferred value, the guide distance until the liquid 41 and the gas 42 reach the liquid is short, and the liquid 41 and the gas 42 ejected from the ejection hole 11a are short. Since it diffuses into the liquid L in time, there is not enough space to generate a negative pressure near the outlet of the ejection hole 11a, so the negative pressure force generated near the outlet of the ejection hole 11a is insufficient. In any case, the reason is that bubbles cannot be generated efficiently.

Therefore, according to the fine bubble generator A of this embodiment, fine bubbles can be generated more efficiently and reliably.
Further, the fact that the ejection amount of the gas 42 can be increased means that the flow rate of the gas 42 introduced into the gas chamber 10 is reduced by the adjusting valve 33 and the atmospheric pressure in the gas chamber 10 is reduced, thereby generating fine bubbles. When the liquid is jetted into the liquid L, finer bubbles can be generated with the water pressure of the liquid L.

In the fine bubble generator A of the present embodiment, the following items are confirmed by an experiment in which the liquid 41 and the gas 42 are jetted into the liquid L via the guide tube 11b to generate the bubbles 42a.
(1) When the liquid 41 and the gas 42 are ejected from the ejection hole 11a, the vicinity of the outlet of the ejection hole 11a becomes negative pressure, and the water pressure acting on the ejection hole 11a decreases.
(2) As the pressure of the liquid 41 ejected from the liquid ejection nozzle 20 increases, the bubbles 42a become finer and larger in volume.
(3) By adjusting the flow rate of the gas 42 introduced and sucked into the gas chamber 10 by the adjusting valve 33 at the rear end of the gas introduction pipe 30, the size of the generated bubbles 42a can be adjusted.
That is, if the flow rate of the gas 42 is decreased by the adjusting valve 33, the bubbles 42a are made finer. Conversely, if the flow rate of the gas 42 is increased, the bubbles 42a are increased.
(4) When the ejection hole 11a becomes larger, the flow rate of the gas 42 sucked and introduced from the gas introduction pipe 30 increases, and the generated bubbles 42a become larger.
(5) As the distance from the tip of the liquid jet nozzle 20 to the inner surface of the jet hole plate 11, that is, the distance from the tip of the liquid jet nozzle 20 to the jet hole 11 a increases, the flow rate of the gas 42 sucked and introduced from the gas introduction pipe 30 increases. As it increases, the bubble 42a becomes larger.
(6) As the water pressure at the injection destination is higher, as in the case where the water at the injection destination is deep, the bubbles 42a are made finer.

  It should be noted that the present invention is not limited to the illustrated embodiments, and can be implemented with configurations within a range that does not deviate from the contents described in the respective claims.

The principal part notch side view which shows an example of the fine bubble generator which concerns on this invention. The front view of FIG.

Explanation of symbols

10: Gas chamber 11: Ejection hole plate 11a: Ejection hole 11b: Guide pipe 20: Liquid injection nozzle 20a: Injection port 30: Gas introduction pipe 41: Liquid 42: Gas 42a: Bubble A: Fine bubble generator S: Space

Claims (3)

A gas chamber having a space into which gas is introduced; a liquid injection nozzle that is attached to the gas chamber and injects liquid into the gas chamber toward the front; and a gas introduction pipe that introduces gas into the gas chamber;
A jet hole through which the liquid jetted from the liquid jet nozzle and the gas in the gas chamber pass is opened on the coaxial line with the axis of the liquid jet nozzle, and on the coaxial line with the jet hole. A guide pipe communicating with the
The ejection hole is larger in diameter than an ejection diameter of the liquid ejection nozzle and larger than a diameter of a liquid passing through the ejection hole, and the guide pipe is larger in diameter than the ejection hole. A fine bubble generator.   2. The fine bubble generator according to claim 1, wherein an inner diameter of the guide tube is set to 2 to 3 times a diameter of the ejection hole.   3. The fine bubble generator according to claim 1, wherein a total length of the guide tube is five times an inner diameter of the guide tube.

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