JPS61192328A - Apparatus for generating fine air bubbles - Google Patents

Abstract

PURPOSE:To stably generate a large amount of uniform fine air bubbles in a liquid to be bubbled at a high speed, by injecting a liquid sent under pressure from an ejector type gas nozzle and sucking gas such as air to inject the same. CONSTITUTION:A liquid to be injected is injected to a liquid tank 41 over the width thereof from an ejector type gas nozzle 11 through a flow control valve and a heat exchanger. At this time, gas is sucked from a gas suction pipe 65 under low pressure generated around the injected liquid and injected into a liquid to be bubbled along with the injected liquid to generate fine air bubbles 81. The average bubble size of fine air bubbles can be appropriately regulated between 100-200mum by selecting the thickness of a gas jet ring and the overlapped length of nozzles. As the liquid, both of a Newton fluid and a non- Newton fluid can be used and various kinds of gases can be utilized and, therefore, this apparatus can be applied to a food field and other various fields.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microbubble generating device for generating microbubble in various liquids.

[Prior art] When many microbubbles are included in food, as seen in sponge cakes, foam snowflakes, whipped cream, etc., the texture of the food is improved, the taste is made milder, and the sensory characteristics of the food are improved. Known to improve functionality.

Conventionally, mechanical agitation foamers such as a manual agitation foamer, a handle manual agitation foamer, and an electric agitation foamer have been used as bubble generators for this purpose.

However, in the conventional bubble generator, it is not only necessary to make the air bubbles uniformly fine by adjusting the outside diameter of the whisk, shape, stirring speed, etc., but also to improve the foaming efficiency. There was a problem that the bubbles were poor and the speed of the melon was slow.

The problems related to foaming are of great interest not only in food products but also in various industrial fields, and a foaming device with good quality and efficiency is desired.

[Objective of the Invention] The purpose of the present invention is to solve the above-mentioned problems, and to provide a micro-bubble generating device that can continuously and stably generate uniform micro-bubbles in large amounts. Is Rukoto.

[Structure of defense] The microbubble generator of the present invention achieves the above object!
The liquid 3 pumped by the liquid pumping means 5 is spouted from the liquid nozzle 61 and the gas 67 is sucked into the low pressure section generated by the spouted liquid 3. Fine bubbles 8 are created by the gas 67 ejected together with the liquid 3 from the type gas nozzle 11.
1 and a wall surrounding the foaming liquid 43 to avoid generation of foaming liquid 43.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. FIG. 1 is a diagram showing the principle of fine bubble formation/J'3A position, FIG. 2 is a partial sectional view of the ejector type gas nozzle, and FIG. 3 is a partially enlarged view of the nozzle 3 of the ejector type gas nozzle.

As shown in FIG. 1, the ejected liquid 3 such as water or oil stored in the ejected liquid tank 1 is passed through a flow rate adjustment valve 7, a heat exchanger 9, and a switching cock 29 by a liquid sending pump 5. It is sent to the lid type gas nozzle 11 or the preliminary ejector type gas nozzle 13 and is ejected into the liquid tank 41 or the preliminary liquid tank 31.

To explain in more detail below, 15 is an air chamber for smoothing unevenness in liquid feeding pressure, 17 is a liquid feeding pressure gauge, 19 is a safety valve for slowing the excess liquid to the ejecting liquid tank 1, and 21 is a feeding pressure gauge. It is a liquid flow meter. Heat exchanger 9, heating liquid (A l'J
79 and the heater 27 are connected to the ejected liquid 3 in the heat exchanger 9.
23 is a heating oil bath thermometer;
5 is a nozzle inlet pressure gauge. The switching cock 29 is used to feed liquid to the preliminary ejector type gas nozzle 13 provided in the preliminary liquid tank 31 from the start of operation until a steady state is reached. Reference numeral 35 denotes an inlet thermometer of the main-lid type gas nozzle 11 and the preliminary]-zekta type gas nozzle 13.

65 is a gas suction pipe C of the ejector type gas nozzle 11 and the preliminary ejector type gas nozzle 13, and in this example, the suction port thereof is opened to the air to suck air. 37 is an intake gas flow rate 81. A foaming liquid 43 is stored in the liquid tank 41 and the preliminary liquid tank 31.
1 has a temperature 39 and a heat exchanger 1! I5 is provided. This heat exchanger 45 adjusts the viscosity of the foaming liquid 43 as appropriate by heating or cooling it.

The ejector type gas nozzle 11 and the preliminary lid type gas nozzle 13 have exactly the same configuration, so to explain the pre-lid type gas nozzle 11, as shown in FIG. 55 is screwed onto the nozzle body 51 with a screw 57 and installed.

A liquid nozzle main body 59 is press-fitted into the through hole 83 of the nozzle main body 51, and the liquid nozzle 61 at the tip of the liquid nozzle main body 59 is formed in the parallel section of the gas nozzle 63 formed in the gas nozzle main body 55, as shown in FIG. It is inserted and installed inside the wall 1 with an overlap length ΔL. On the other hand, a gas suction pipe 65 is provided in the corner of the nozzle body 51, and a small hole 69 is bored continuously with the gas suction pipe 65. and is guided to a gas nozzle 63.

In addition, by changing the thickness of 70 with a shim, the nozzle overlap length Δ1 - that is, the relative position of the parallel portion of the gas nozzle 63 and the liquid nozzle 61 can be accurately determined.

Next, the operation of this embodiment will be explained.

When the ejected liquid 3 is pressure-fed from the ejected liquid tank 1 to the heat exchanger 9, it is heated by the sea urchin heating heater 27 until it has a sufficiently low viscosity so that it can be ejected from the ejector type gas nozzle 11 at high speed. Subsequently, the ejected liquid 3 is transferred to the switching cock 2.
9 to the preliminary ejector type gas nozzle 13,
From this preliminary ejector type gas nozzle 13 to the preliminary liquid tank 31
It is squirted inside.

When it is confirmed that the ejected liquid 3 is stably and continuously ejected from the preliminary lid type gas nozzle 13 after a certain period of time has elapsed, the two switching cocks are switched, and the ejected liquid 3 is then transferred to the pre-operated lid type gas nozzle 11. is forced towards. The ejected liquid 3 that has been force-fed toward the ejector-type cass nozzle 11 is ejected from the C liquid nozzle 61 into the liquid tank 41 through the )H hole 83 of the nozzle body 51.

At this time, if the jetting speed of the jetted liquid 3 is sufficiently high, a low pressure area is generated around the jetted liquid 3, and this low pressure area is filled with air 67 through the gas nozzle 63, the small hole 69, and the gas suction pipe 65. is inhaled, and air 67 is ejected into the foamed liquid 43 along with the ejected liquid 3. Air blown out in this way 67
This generates desired fine bubbles 81 in the foaming liquid 43.

□If the viscosity of the foaming liquid 43 is extremely low and there is a risk that the generated microbubbles may float on the top surface of the liquid within a short period of time and diffuse into the air, the foaming liquid 43 may be heated by the heat exchanger 45. If you cover it to cool it and increase its viscosity, J
: Yes.

FIG. 4 shows an example of the bubble diameter distribution when fine bubbles are generated by the apparatus of the above embodiment.

However, in this example, both the ejected liquid 3 and the foamed liquid 43 are salad oil. Also, the length of the parallel part of the gas nozzle is 1 = 1.5
mm, the inner diameter of the liquid nozzle is d2=0.36Il1m, the outer diameter of the liquid nozzle is d1=0.63mm, and the thickness of the ejected gas ring is δ! J = 0.15mm, liquid pumping pressure P =
7.0 kof/cm2, and fine bubbles were generated in 2 fl of the foaming liquid 43 for 20 seconds.

Then, by adjusting the thickness of the shim 70 and moving the gas nozzle body 55 back and forth with respect to the nozzle body 51, the nozzle overlap length ΔL is set to −1, Q, mm.

-0.5mm, 0.0mm, and 0.5vn.

As can be seen from the figure, the nozzle overlap length △1- is -1
,0mm, -0,5mm, 0.0non, 0.5
80 to 90% of the bubbles generated in any case are
The bubble diameter is 50 to 200 m/m. In the conventional mechanical stirring foamer, the bubble diameter of the generated bubbles is about 200~
Since it is known that the bubble diameter is 800 μm, the device of this embodiment can generate much finer and more uniform microbubbles compared to the conventional device.

FIG. 5 shows the nozzle overlap length △11. In addition to Cl174
Outer ring thickness δg is also 0.10mm, 0.15m++
+, average bubble diameter μ when changing from 0°20mm
This shows m. However, this average bubble diameter 6 is the ejected gas flow faQmL/min, bubble formation/A: speed N
It is given by: bubbles/min, and represents the average bubble diameter of the bubbles when the intake gas Q is assumed to be N bubbles of the same size. As can be seen from the figure, according to this embodiment, the average bubble diameter can be adjusted to 100 to 20 by selecting the ejection ring thickness δq and the nozzle weight t and the length difference Δ.
It can be adjusted appropriately between 0 μm.

In addition, there are some changes depending on the number of bubbles generated per minute, the number of bubbles generated per minute, the ejection ring thickness δg and the nozzle overlap length Δ1-,
min), and high efficiency foaming Zl can be carried out. Although the bubble generation rate increases as the rupture decreases, if it is less than -0.5 mm, the bubble generation state may become unstable, which is not practical.

As described above, the micro-bubble generating device of this embodiment can generate a large amount of micro-bubble at high speed compared to the conventional device.

In the above embodiment, the suction port of the gas suction pipe 65 was opened to the air to suck air, but by connecting cylinders of various gases to the gas suction pipe 65, fine particles of gas other than air Bubbles can also be generated. In particular, if an inert gas such as N2 or GO2 is used as this gas, it can be useful for preventing oxidative deterioration of foods and maintaining quality. Furthermore, by inhaling aromatic gases and incorporating these microbubbles into foods, it becomes possible to develop new foods.

Further, in the above embodiment, both the liquid 3 ejected from the liquid nozzle 61 and the foamed liquid 43 that generates microbubbles are Newtonian fluids, but both or one of them may be a non-Newtonian fluid such as egg white or gelatin. is also possible. However, in that case, the liquid nozzle 61. It is necessary to appropriately select the nozzle diameter of the gas nostle 63, the magnitude of the liquid pumping pressure, and the presence or absence of the heater 27 and the heat exchanger 45. For example, for Newtonian fluid, the liquid nozzle 6
1 nozzle diameter d + = 0.6 mm-1, liquid pumping pressure P = 5 to 8 kgf 7 cm2 at On+m is appropriate, but for non-Newtonian fluids, d + = 0.8 mm ~
At 1.5 mm, P-6 to 12 kg [/C12] is appropriate. In this way, a desired amount of fine bubbles can be contained even in a non-Newtonian fluid such as egg white or gelatin.

Further, in the above embodiment, the ejector type gas nozzle 11 is connected to the oil tank 41.
Although it was installed below the side of the machine, it can also be installed above the side. In this way, the liquid pumping force of the ejected liquid 3 can be made considerably smaller than the liquid pumping force P of the embodiment described above. However, in this case, the fine bubbles 81 generated
In order to prevent the bubbles from rising to the surface of the liquid and dispersing into the air within a short period of time, it is desirable to appropriately stir the fine bubbles by installing a stirrer for the foamed liquid 43 in the oil tank 41.

Furthermore, by installing an automatic control device linked to a computer, it is possible to control the bubble generation state with a single touch. For example, the flow rate, pressure, flow rate, etc. are detected using the above-mentioned thermometer, pressure gauge, flow rate analyzer, etc., and the opening degree of the flow rate adjustment valve 7 and the inflow amount of the intake gas 67 are controlled via the control combination coater. The bubble generation speed is automatically adjusted to increase the bubble density in the foaming liquid 43/! 1, that is, the bubble content can be controlled to an appropriate value.

Of course, by increasing the number of ejector type gas nozzles 11, the amount of foaming per unit time can be increased.

Furthermore, the foaming liquid 43 does not necessarily have to be stationary as in the above embodiments, but may be moving slowly in the vibrator, for example.

The present invention can be used not only as a means for incorporating microbubbles into foods as described above, but also as a foaming means in other fields as described below.

(1)0 For example, in the field of livestock farming, there is a long-awaited technology to improve the digestion and absorption of feed in order to promote the growth of young livestock. Knowledge has been obtained that it increases the fattening effect. Therefore, if the fine bubble generator is used to generate fine bubbles in the drinking water of livestock, the growth of young livestock can be promoted.

(2) Also, aquaculture and cultivation fisheries are becoming more popular due to the depletion of fish resources, but when cultivating large quantities of fish in a large-scale aquaculture system, it is necessary to ensure the amount of dissolved oxygen in the seawater. be. The micro bubble generator of the present invention is also optimal for supplying dissolved oxygen. In other words, the bubbles that are blown into seawater have a small diameter (the smaller the bubble, the larger the surface area, and the better it dissolves in the water, but according to the micro bubble generator of the present invention, ultrafine oxygen of 100μI11 to 200μm) Since bubbles can be generated at high speed, large amounts of oxygen can be dissolved into seawater very easily.

(3) Furthermore, foaming agents are used in the production of abrasion-resistant concrete containing air bubbles (1), but the foaming agents not only do not make the cell diameters uniform, but are also very harsh, which naturally makes them difficult to use. 6 will be limited.

Therefore, by using the micro bubble generator of the present invention, it is possible to
[Contains ultra-fine bubbles and is lightweight: I-crete,
It becomes possible to cover a variety of concrete shrines, such as concrete for insulation, at low cost.

[Effects of the Invention] As stated in the first claim, the present invention uses an ejector-type gas nozzle to eject a liquid into a liquid to be foamed, and at the same time, sucks gas into a low-pressure part generated by the ejected liquid. However, since this is a micro-bubble generator that ejects the gas into the liquid to be foamed together with the ejected liquid to generate micro-bubbles encapsulating the gas, the diameter of the bubbles generated is smaller than that of conventional stirring-type whisks. Since the bubbles are extremely fine and the bubble generation speed is human, the foaming process can be carried out highly efficiently and continuously.

Since the present invention can suck various gases other than air, it can be used, for example, to generate microbubbles to prevent food deterioration, to develop new foods containing aromatic bubbles, or to It can be used in a wide variety of industrial fields, including rapid dissolution of human oxygen.

[Brief explanation of drawings]

Figures 1 to 3 all show embodiments of the present invention, with Figure 1 being a principle diagram of a microbubble generator, and Figure 2 being a detailed cross-sectional view of an ejector-type gas nozzle. This shows the bubble size distribution, average bubble diameter, and bubble generation rate. 3... Ejected liquid 11... Lid type gas nozzle 27... Heater 43... Liquid to be foamed 57...
・Screw 61...Liquid nozzle 63...Gas nozzle 65...Gas suction pipe 67...Gas 7
0... SIM Patent Applicant Hitoshi Nagahiro Representative Patent Attorney Yasuo Miyoshi Figure 2 G' Figure 4 Bubble diameter D (μm)

Claims (6)

[Claims] (1) An ejector-type gas nozzle 11 that ejects the liquid 3 force-fed by the liquid pressure-feeding means 5 from a liquid nozzle 61 and sucks gas 67 into a low-pressure part generated by the ejected liquid 3; A micro-bubble generating device comprising: a wall surrounding a foaming liquid 43 that generates micro-bubbles 81 by a gas 67 ejected together with the liquid 3. (2) The ejector type gas nozzle 11 has a liquid nozzle 61 that ejects the liquid 3 from the outlet portion, and an outlet portion having an outlet area larger than the outlet area of the liquid nozzle 61, and is a gas nozzle that ejects the gas 67 from the outlet portion. 63, and the outlet portion of the liquid nozzle 61 is disposed inside or behind the gas nozzle 63.
The microbubble generator described in Section 1. (3) The micro bubble generating device according to claim 2, wherein the gas nozzle 63 is provided movably in the jetting direction of the liquid 3 with respect to the liquid nozzle 61. (4) The micro bubble generating device according to claim 2, wherein the gas nozzle 63 has a parallel hole. (5) The micro bubble generating device according to claim 4, wherein the gas nozzle 61 is provided movably in the jetting direction of the liquid 3 with respect to the liquid nozzle 63. (6) Depending on whether the liquid 3 ejected from the liquid nozzle 61 is a Newtonian fluid with low viscosity such as water or oil, or a non-Newtonian fluid with high viscosity such as egg white or gelatin, the nozzle diameter, the size of the liquid delivery pressure, and the heating 27 and the presence or absence of a heat exchanger 45 is determined. The fine bubble generating device according to claim 1.