JP3333354B2 - Defoaming method and defoaming device for liquid that easily generates bubbles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for agitating a liquid that easily generates bubbles to eliminate or reduce the amount of the bubbles, and a method for stirring a liquid that easily generates bubbles while suppressing the generation of bubbles. Is also an applicable method. The present invention also relates to an apparatus suitable for the above method.

[0002]

2. Description of the Related Art In the industrial fields such as food processing and chemistry, work for stirring a liquid is performed on a daily basis. The conventional stirring apparatus rotates a propeller type or flat turbine type stirring blade in a liquid. That is, the conventional stirring method rotates a propeller or the like in a liquid.

[0003]

Some of these agitated liquids are extremely easily foamed, for example, raw soybeans (things obtained by adding water to soybeans). When these liquids are agitated by a conventional method using a rotation of a propeller or the like, air is entrained in the liquid and a large amount of bubbles are generated. As a result, there is a problem that the liquid level sensor of the tank malfunctions. In addition, the liquid in which bubbles have been generated may have to wait for the bubbles to calm down and return to the liquid when performing the next operation step, and there has been a problem that the working efficiency is poor. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for defoaming a liquid in which bubbles are easily generated and an apparatus used in the method, focusing on the above-mentioned problems of the prior art. The present invention is also a method of stirring a liquid which is likely to foam while suppressing the generation of bubbles.

[0004]

In order to achieve the above-mentioned object, the present invention provides a defoaming vane having a continuous spiral formed with a flat plate around an axis, for removing liquid that is liable to generate bubbles. This is a method of defoaming a liquid in which bubbles are easily generated, wherein the spiral of the defoaming blade is arranged so as to penetrate the foam layer, and the defoaming blade is rotated so that the liquid moves downward.

[0005] Further, the present invention obtained by improving the above-mentioned invention is as follows.
The liquid in which bubbles are easily generated is contained in the tank, and the spiral diameter of the defoaming blade is 1/20 to 1 of the tank inner diameter.
/ 2, the upper end of the spiral of the defoaming vane is arranged at a position 50 mm or more higher than the upper end of the foam layer, and the lower end of the spiral of the defoaming blade is the upper end of the foam layer, where L is the thickness of the foam layer. 2L or more from the bottom.

Another invention for achieving the same object is to provide a defoaming vane in which a continuous spiral is formed with a flat plate around an axis, and the upper end of the spiral is placed in a foam layer of a liquid in which bubbles are easily generated. This is a method of defoaming a liquid in which bubbles are easily generated, characterized in that the defoaming blades are arranged so as to be positioned and the defoaming blades are rotated so that liquid movement occurs downward.

Further, an invention of an apparatus applicable to the above-mentioned invention is an antifoaming device in which a blade having a rotating function is provided on a shaft, wherein the blade has a flat plate shape, and the blade is arranged around the shaft. A defoaming device characterized by forming a spiral.

Another aspect of the present invention is a defoaming apparatus including a tank in which a liquid in which foam is easily generated is put and a defoaming blade having a rotating function, wherein the blade has a flat plate shape. Form a continuous spiral centered on the shaft,
The upper end of the spiral of the defoaming blade is 5 times higher than the upper end of the foam layer in the tank.
0 mm or more, it is arranged so as to be on the upper side, and the lower end of the spiral of the defoaming blade is arranged such that the thickness of the foam layer is L, and 2 L or more from the upper end of the foam layer, and is lower than the upper end of the foam layer. The diameter of the spiral is 1/20 to 1/2 of the inner diameter of the tank, and the rotation speed of the defoaming blade is variable.

[0009]

The method of defoaming a liquid according to the present invention, in which bubbles are easily generated, utilizes a defoaming blade having a continuous spiral formed around a shaft with a flat plate. Then, in the defoaming method of the present invention, the spiral of the defoaming blade is arranged so as to penetrate the foam layer, and the defoaming blade is rotated downward so that liquid movement occurs. Therefore, in the defoaming method of the present invention, the foam directly touches the defoaming blade, and a downward moving force is generated in the foam layer, and the foam is directly pushed into the liquid layer. As a result, the foam collapses and returns to the original liquid. Further, a downward propulsive force is generated in the foam layer and the liquid layer, and the liquid flows to stir the liquid.

[0010] In particular, in the second aspect of the present invention, the upper end of the defoaming blade is arranged at least 50 mm above the upper end of the foam layer. As a result, the foam is pushed down from the top one. In addition, the lower end of the spiral of the defoaming blade is 2 L or more from the upper end of the foam layer, where L is the thickness of the foam layer.
Since it is arranged so as to be at the bottom, the bubbles are carried to a deep position in the liquid layer portion, and are dissolved and broken with high efficiency.

According to the third aspect of the present invention, the defoaming blade in which a continuous spiral is formed with a flat plate is in the foam layer, and the foam is pushed into the liquid layer by the rotation of the blade, so that the foam is dissolved and broken. .

According to a fourth aspect of the present invention, the blade has a flat plate shape, and the blade forms a spiral around the shaft. The rotation of the blade pushes down the bubble and pushes the bubble into the liquid. be able to.

[0013] In the defoaming device according to the fifth aspect, the blades are flat, and the blades form a continuous spiral centered on the shaft.
The foam can be forced into the liquid. In addition, the upper end of the spiral of the defoaming blade is arranged so as to be at least 50 mm higher than the upper end of the foam layer in the tank, and the lower end of the spiral of the defoaming blade has a thickness of the foam layer of L. Since the layer is arranged so as to be at least 2 L below the upper end of the layer, the bubbles at the uppermost portion are carried deep into the liquid layer by the rotation of the blades, and the dissolution and foam breakage are promoted. Furthermore, in the defoaming device of the present invention,
The diameter of the defoaming blade is 1/20 to 1/2 of the inner diameter of the tank, and has a relatively wide surface to push down the foam. Further, since the rotation speed of the defoaming blade is variable, the rotation speed most suitable for the property of the liquid can be selected, and the defoaming or stirring operation can be performed efficiently.

[0014]

EXAMPLES Specific examples of the present invention will be described below. FIG. 1 is a partial sectional perspective view of a defoaming apparatus according to a specific embodiment of the present invention. FIG. 2 is a partially sectional perspective view of a defoaming apparatus according to a modified embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a defoaming device of the present embodiment. The defoaming device 1 of this embodiment has a defoaming blade 3 disposed in a tank 2. To explain sequentially, tank 2
Is similar to a well-known stirring tank, is cylindrical, and is open at the top. Further, a temperature controller and a liquid level sensor (not shown) are provided. The defoaming vane 3 is formed by winding a flat plate 6 around the shaft 5 and welding it. A continuous spiral is formed by the flat plate 6, and a spiral blade 9 is formed by the spiral formed by the flat plate 6. The surface of the flat plate 6 is smooth and has no holes or protrusions. However, since the spiral blade 9 is formed by winding the flat plate 6, the spiral blade 9 has a curved portion.

The thickness of the flat plate 6 is arbitrary, but preferably about 2 mm. Further, it is desirable that the outer diameter D of the spiral is uniform and 1/20 to 1/2 of the inner diameter of the tank 2. More specifically, it is recommended that the outer diameter D of the spiral blade 9 be designed to be の of the inner diameter of the tank 2. The shaft 5 receives power transmission from a prime mover (not shown) via a continuously variable transmission, and is rotatable and its rotation speed can be arbitrarily changed.

Next, a method of defoaming a liquid that easily generates bubbles using the defoaming apparatus of the present embodiment will be described. First, the tank 2 is filled with a liquid to be defoamed to a predetermined liquid level. In this operation, the liquid in which bubbles have been generated by another stirring device may be transported to the tank 2 by a pump or the like, or the liquid filled in the tank 2 used in the embodiment may be transferred by a known propeller blade or the like. The foam may be generated in the tank 2 by stirring. Then, for the liquid in the tank 2, the defoaming blades 3 employed in this embodiment are arranged at predetermined positions. It should be noted that the positional relationship between the defoaming blade 3 and the liquid causes a significant difference in the defoaming effect.

That is, the defoaming blade 3 is arranged such that the upper end SH of the spiral blade 9 is located 50 mm or more above the upper end FH of the foam layer 7, and the lower end SL of the spiral blade 9 of the defoaming blade 3 is And the thickness of the foam layer 7 is set to be 2 L or more and lower from the upper end of the foam layer 7. In actual work, the defoaming vanes 3 are arranged with the upper end SH of the spiral blade 9 as a reference, and the upper end SH of the spiral blade 9 is 100 m higher than the upper end FH of the foam layer 7.
m. In addition, when placed at this position, the lower end SL of the spiral of the defoaming blade 3 is positioned 2 mm from the upper end of the foam layer.
If the position is within L, the position of the defoaming blade 3 is lowered.

Of course, since the position of the defoaming blade 3 is relative to the amount of liquid, the defoaming blade 3 is fixed at an appropriate position in advance, and the positional relationship with the defoaming blade 3 is determined. The amount of liquid may be increased or decreased so as to satisfy the following.

In this state, the defoaming blade 3 is rotated so that a downward flow is generated in the liquid. The rotation speed of the defoaming blade 3 varies depending on the container diameter, the viscosity of the liquid, and the like.
In many cases, it is carried out at about 30 rpm. Defoaming feather 3
Is rotated, the bubbles are entrained from the spiral portion of the defoaming vanes 3 in the foam layer 7, the entire bubbles move downward as indicated by the arrow in the figure, and the bubbles are pushed down into the liquid layer 8. Then, the bubbles are dissolved and broken in the liquid layer 8, and the bubbles are liquefied again.

The inventor of the present invention has confirmed the effect of the defoaming apparatus 1 by putting the foamed foam into the defoaming apparatus 1 of the present embodiment, and it has been confirmed that the foam of the foam is rapidly reduced. . In addition, the malfunction of the liquid level sensor caused by bubbles, which frequently occurs in the related art, has been eliminated.

In the above-described embodiment, the position of the defoaming blade 3 is set such that the upper end SH of the spiral blade 9 is 100 degrees higher than the upper end FH of the foam layer 7.
An example in which the upper end SH of the spiral blade 9 is at least 50 mm higher than the upper end FH of the foam layer 7 is described.
However, depending on the nature of the liquid, the effect may be expected even if the upper end SH of the spiral blade 9 is buried in the foam layer 8 as shown in FIG.
Such a configuration is also included. In the above embodiments, the defoaming action of the present invention has been mainly described. However, the defoaming method and the defoaming device for a liquid in which the foam is easily generated according to the present invention are applied to the liquid in which the foam is easily generated. It can also be applied to the use of stirring without generation of water.

[0023]

According to the method of the present invention for defoaming a liquid in which bubbles are easily generated, a continuous spiral having a flat plate around an axis is arranged from the upper part of the foam layer to the liquid layer and rotated. In the invention, by moving from the foam layer to the liquid layer and rotating, a downward moving force is generated in the foam layer,
Bubbles are pushed directly into the liquid layer. As a result, the foam dissolves, collapses, and exhibits an excellent defoaming effect. In particular, claim 2
In the described invention, the rotation of the defoaming vanes allows the foam to be transported to a deep position in the liquid layer portion even at the highest position, and has an effect of defoaming with high efficiency.

The defoaming device according to claims 4 and 5 has an excellent defoaming action and has an effect of being excellent in workability. In particular, the defoaming device according to the fifth aspect is excellent in defoaming effect because the foam is pressed down with a relatively wide surface, and the rotation speed most suitable for the property of the liquid can be selected, so that the defoaming operation can be performed efficiently. There is an effect that can be performed well.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional perspective view of a defoaming device according to a specific embodiment of the present invention.

FIG. 2 is a partially sectional perspective view of a defoaming device according to a modified embodiment of the present invention.

[Explanation of Signs] 1 defoaming device 2 tank 3 defoaming blade 5 axis 6 flat plate 7 foam layer 8 liquid layer 9 spiral blade

Claims (5)

(57) [Claims] 1. An antifoaming blade having a continuous spiral formed with a flat plate around an axis is disposed so that the spiral of the antifoaming blade penetrates a foam layer with respect to a liquid that easily generates bubbles, and faces downward. A defoaming blade for rotating the defoaming blade so as to cause liquid movement. 2. A liquid in which bubbles are likely to be generated is contained in a tank, wherein the diameter of the spiral of the defoaming blade is 1/20 to 1/2 of the inner diameter of the tank, and the upper end of the spiral of the defoaming blade. Is located 50 mm or more above the upper end of the foam layer, and the lower end of the spiral of the defoaming blade is arranged such that the thickness of the foam layer is L and 2 L or more from the upper end of the foam layer is below. 2. The method for defoaming a liquid according to claim 1, wherein bubbles are easily generated. 3. An antifoaming vane having a continuous spiral formed with a flat plate around an axis is arranged such that the upper end of the spiral is located in a liquid foam layer in which bubbles are easily generated, and the liquid moves downward. A defoaming method for a liquid in which bubbles are easily generated, characterized by rotating an antifoaming blade so as to generate bubbles. 4. A defoaming device in which blades are provided on a shaft having a rotation function, wherein the blades are flat, and the blades form a spiral around the shaft. Foam equipment. 5. A defoaming apparatus comprising a tank in which a liquid in which foams are likely to be generated is put and a defoaming blade having a rotating function, wherein the blades are flat, and the blades are continuous around a shaft. The spiral of the defoaming blade is arranged so that the upper end of the spiral of the defoaming blade is at least 50 mm higher than the upper end of the foam layer in the tank, and the lower end of the spiral of the defoaming blade has a thickness of the foam layer. L
The lower part of the foam layer is arranged to be at least 2 L below the upper end of the foam layer, and the diameter of the spiral of the defoaming blade is 1/20 of the inner diameter of the tank.
A defoaming device wherein the rotation speed of the defoaming blade is variable.