JPH0731859A - Liquid mixing machine - Google Patents

Abstract

PURPOSE:To provide a liquid mixing machine which can mix uniformly two or more kinds of liquids with a high treating capacity and is suitable especially for obtaining a uniform solution by mixing water glass and an alkaline earth metal salt or an acidic aqueous solution which are the components of a chemical solution for stabilizing soil used for the purposes of the reinforcement of weak ground and stopping water. CONSTITUTION:This mixing machine consists of a liquid mixing chamber 3 having at least two or more liquid supply ports 1, 2 and a cylindrical nozzle 4 connected to the liquid mixing chamber 3, and a rotary blade 5 which is actuated to generate a liquid flow in the opposite direction to a downward liquid flow is installed in the inside of the outlet side of the cylindrical nozzle 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel liquid device which can be effectively used for mixing two or more kinds of liquids. For more information,
It is possible to mix two or more kinds of liquids uniformly with high processing capacity, especially water glass and alkaline earth metal salts or acid which are components of soil stabilization chemicals for strengthening soft ground and stopping water. This is a liquid mixing apparatus suitable for mixing with the above aqueous solution to obtain a uniform solution.

[0002]

2. Description of the Related Art Conventionally, a large number of water glass systems in which a gelling agent is added to water glass have been provided as a chemical liquid for soil stabilization.

When an alkaline earth metal salt or an acidifying agent is used as a gelling agent for such a soil stabilizing chemical, a cotton-like silicate gel is generated and a precipitate is deposited if the mixing is insufficient.
It becomes difficult to obtain a uniform water glass solution. And
The soil stabilization chemical that generated such a silicate gel is
Not only the gelling property of itself is not sufficiently exerted, but also because it contains a precipitate, it is difficult to permeate into the injection ground, and the strength is remarkably lowered. Also, when a solution of an alkaline earth metal salt or an acidifying agent and a cloudy solution of cement are mixed in water glass, a cotton-like silicate gel (precipitate) is deposited, which causes the same problem as described above.

Conventionally, in order to sufficiently mix such liquids,
Various mixing devices have been proposed.

For example, as shown in FIG. 2, in a cylindrical liquid mixing chamber 3 having a plurality of liquid supply ports 1 and 2, at least one liquid supply port 2 is tangential to the inner wall of the liquid mixing chamber. The liquid is connected so as to be supplied, and by the action of the swirling flow of the liquid generated in the liquid mixing chamber, it flows down in the liquid mixing chamber 3 and mixes both liquids until it reaches the subsequent cylindrical nozzle 4. A liquid mixing device is known.

In order to further enhance the mixing ability by the swirling flow, a stirring blade is provided in the cylindrical nozzle 4 connected to the lower part of the liquid mixing chamber to vigorously stir the liquid. Is also proposed.

[0007]

According to the above liquid mixing apparatus, it is possible to uniformly mix two or more kinds of liquids. However, when processing a large amount of liquids, the processing capacity is insufficient and the liquids are uniform. There is a problem that mixing becomes difficult. Further, even in the case of mixing liquids that require time for mixing, uniform mixing becomes difficult.

In order to solve these problems, it is necessary to increase the size of the device. However, such measures not only result in an economical disadvantage, but also make the device difficult to handle, and work in the field. It also causes the problem of decreased sex.

[0009]

Means for Solving the Problems The inventors of the present invention have made extensive studies to solve such problems. As a result, inside the outlet side of the cylindrical nozzle connected to the liquid mixing chamber, a rotary blade that operates so as to generate a liquid flow in the opposite direction to the flowing liquid flow is provided, so that it flows down from the liquid mixing chamber. The present invention has been completed by finding that the mixed solution can be mixed more highly uniformly and the mixing processing capacity of the apparatus can be remarkably improved.

The present invention will be specifically described below with reference to the accompanying drawings, but the present invention is not limited to these accompanying drawings.

1 and 3 to 5 are sectional views (including partial partial sectional views) showing the outline of a typical embodiment of the liquid mixing apparatus of the present invention.

The liquid mixing apparatus of the present invention comprises a liquid mixing chamber 3 having at least two liquid supply ports 1 and 2, and the liquid mixing chamber 3
And a rotary blade 5 that operates so as to generate a liquid flow in a direction opposite to the flow of the flowing liquid, inside the outlet side of the cylindrical nozzle 4. It is a thing.

The liquid mixing apparatus of the present invention is applied to the case where two or more kinds of liquids are mixed to obtain a uniform solution. In particular, as described above, the silicate gel (precipitation) is instantaneously obtained by the usual mixing method. (3) is mixed with an aqueous solution of an alkaline earth metal salt or an acidifying agent.

In the present invention, the liquid mixing chamber 3 is not particularly limited as long as it is a cylindrical container having at least two or more liquid supply ports 1 and 2 and having an opening at the bottom, but a plurality of kinds supplied A device having a means for giving a swirling flow to the liquid supplied to the liquid mixing chamber 3 is preferably used so that the liquid can be instantaneously mixed.

For example, a case where two liquid supply ports are provided will be specifically described. As shown in FIG. 1, one of the liquid supply ports 2 supplies the liquid tangentially to the inner wall of the liquid mixing chamber. , And the other liquid supply port 1 is connected to the liquid mixing chamber 3 so as to supply the liquid in a vertical manner. As shown in FIG. 3, both liquid supply ports 1 and 2 are connected to the liquid mixing chamber 3. A mode in which at least one liquid supply port is connected so as to supply the liquid tangentially to the inner wall of the liquid mixing chamber, such as a mode in which the liquid is connected tangentially to the inner wall, is exemplified. To be

As another embodiment, as shown in FIG. 4, both liquid supply ports 1 and 2 are connected to the liquid mixing chamber 3 so as to supply the liquid in a vertical manner, and the liquid is supplied into the mixing chamber 3. Examples include a mode in which a swirl flow generation blade 8 that gives a swirl flow to the supplied liquid is provided.

The swirl flow generation vane 8 can also be used in combination with the mode in which the liquid supply port is provided so as to supply the liquid tangentially to the inner wall of the liquid mixing chamber, whereby the swirl flow is further strengthened. It is possible to further improve the mixing efficiency of the liquid.

The number of revolutions of the swirl flow generating blade 8 may be appropriately determined depending on the mode of use, but generally about 200 to 4000 rpm is suitable.

In the present invention, the shape of the liquid mixing chamber 3 is joined to the cylindrical nozzle 4 having a smaller diameter than that of the liquid mixing chamber, and the flow velocity of the swirling flow is further accelerated. In addition, it is preferable to have an inverted conical shape whose diameter decreases downward. Especially, the inclination of the conical surface is 1 with respect to the horizontal plane.
It is recommended to determine it to be 0 to 70 degrees.

Further, it is preferable that the liquid is supplied from the liquid supply port by pressure feeding through a pressure pump in order to efficiently generate a swirling flow in the liquid mixing chamber. Generally, such pressure is preferably about 0.1 to 4 kg / cm ² .

A feature of the present invention is that inside the outlet side of the cylindrical nozzle 4 connected to the lower part of the liquid mixing chamber 3, there is provided a rotary blade that operates so as to generate a liquid flow in a direction opposite to the flowing liquid flow. There is something.

Conventionally, a mixing apparatus having a stirring blade inside the outlet side of such a cylindrical nozzle has been proposed, but the stirring blade only has a function of stirring the liquid flowing down through the cylindrical nozzle. That is, the technical idea of providing the above-mentioned stirring blade does not show anything to give an action to generate a liquid flow in the opposite direction to the flowing liquid.

According to the present invention, by providing the rotary blade 5 inside the outlet side of the cylindrical nozzle 4 so as to generate a liquid flow in a direction opposite to the flowing liquid flow, the conventional device is used. Different from the simple stirring described above, a part of the mixed liquid is retained in the cylindrical nozzle, and the mixed liquid is vigorously stirred by collision with the liquid flow flowing down from the liquid mixing chamber, and at the same time, the liquid having reactivity is mixed. In that case, the reaction can be carried out more uniformly by contact between the staying mixed liquid and the flowing liquid flow.

Further, since the rotary blade 5 is provided inside the cylindrical nozzle 4, it can be operated without lowering the mixing action due to the swirling flow in the liquid mixing chamber, and the mixing effect can be further enhanced. It can be remarkably demonstrated.

In the present invention, the rotary blade is not particularly limited as long as it operates so as to generate a liquid flow in a direction opposite to the flowing liquid flow, and the size of the mixing device, the amount of liquid supplied, and the like. The ability may be appropriately determined depending on the situation. Generally, the projected area of the blade is 2 to 30% of the cross-sectional area of the tubular nozzle,
It is preferable that one blade having a blade angle of 5 to 80 degrees with respect to the horizontal plane or a structure in which a plurality of blades are fixed to the rotating shaft 6 is used. The rotary shaft is connected to a driving device 7 such as a high-speed motor to rotate the rotary blade, and the rotary speed of the rotary blade is preferably 200 to 4000 rpm.

In the present invention, in order to more effectively exert the mixing effect of the rotary blades 5 in the tubular nozzle 4,
The inner diameter (D) of the cylindrical nozzle is 0.4 to 0.7 with respect to the inner diameter of the vertical wall portion of the liquid mixing chamber 3, L (length) / D (inner diameter)
Is preferably in the range of 3 to 7.

Further, it is preferable that the rotary blade 5 is provided at a position lower than the intermediate portion of the cylindrical nozzle 4.

In the liquid mixing apparatus of the present invention, as shown in FIG. 5, the stirring blade 9 is provided above the rotary blade 5 provided in the cylindrical nozzle 4, and the mixed liquid retained by the rotary blade is used. It is particularly preferable because the mixing with the liquid flowing down from the mixing chamber can be performed more reliably. The capacity of the stirring blade 9 may be appropriately determined according to the size of the apparatus or the like. Generally, it may be attached to the rotary shaft 6 together with the rotary blade 5 and the appropriate size and shape of the stirring blade may be determined under the same rotation condition.

The stirring blade 9 does not need a structure for generating a liquid flow in the opposite direction to the liquid flow flowing down in the cylindrical nozzle 4, and it is rather the liquid mixing chamber that does not have such a function. It is preferable because it does not inhibit the mixing action in.

[0030]

As can be understood from the above description, according to the liquid mixing apparatus of the present invention, it is possible to uniformly mix two or more kinds of liquids with high processing capacity. In particular, in the case of mixing multiple liquids having reactivity, such as mixing water glass, which is a component of a soil stabilization chemical liquid for the purpose of strengthening soft ground or stopping water, and an alkaline earth metal salt or an acidic aqueous solution. In addition, it is possible to exert excellent uniform mixing properties while maintaining high processing capacity, and it can be effectively used.

The above-mentioned water glass is a commercially available aqueous solution of alkali silicate, which is the main component of the water glass type chemical solution conventionally used in the chemical solution injection method, and generally has a specific gravity of about 1.3 to 1.4 and a molar ratio. Those having a ratio of about 2 to 4 are preferable, and if necessary, they can be diluted with water before use. The aqueous solution containing an alkaline earth metal salt is, for example, an aqueous solution in which a soluble salt such as calcium chloride, magnesium chloride or magnesium sulfate is dissolved. As an aqueous solution containing such an alkaline earth metal salt, seawater is used as it is, or an alkaline earth metal salt exhibiting a gelling action by ordinary mixing with water glass, such as water in which seawater and groundwater are mixed. Any aqueous solution may be contained.
Examples of the aqueous solution of the acidifying agent include solutions containing hydrochloric acid, sulfuric acid, bisulfates, and the like.

Needless to say, the application of the mixing apparatus of the present invention is not limited to the mixing of the above-mentioned aqueous solutions, and it can be suitably used for mixing liquids such as suspensions and slurries.

[0033]

EXAMPLES The liquid mixing apparatus of the present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

In the examples, the homogeneity test of the liquid after mixing was conducted by the following method.

(1) Uniformity test A. Clarity: Visually inspected for the absence of floc gel formation within 1 hour after mixing.

B. Stability: The viscosity of the liquid after mixing was measured every 10 minutes with time, and the increase in viscosity from mixing to 60 minutes was examined.

Example 1 Using the liquid mixing apparatus shown in FIG. 1, water glass having a specific gravity of 1.39 and a molar ratio of 3.15 was mixed with a magnesium sulfate aqueous solution having a concentration of 4% by weight.

[0038] (2) Mixing conditions Using the above mixing device, 30 glass of water glass is supplied from the liquid supply port 1.
An aqueous solution of magnesium sulfate was supplied from the liquid supply port 2 at a rate of 30 l / min (pressure: 1.5 kg / cm ² ).

The rotary blade 5 was rotated at 1450 rpm by a high speed motor so as to generate a liquid flow in the outlet side of the cylindrical nozzle 4 in a direction opposite to the flowing liquid flow.

(3) Results As a result of conducting a homogeneity test of the obtained mixed solution (reaction solution), almost no flocculent gel was generated and the stability (rate of increase) was 3%.
It was below.

Example 2 Using the liquid mixing apparatus shown in FIG. 5, mixing was carried out under the same conditions as in Example 1.

The liquid mixing apparatus used as the stirring blades were four plate blades arranged in two columns.

(2) Results As a result of conducting a homogeneity test of the obtained mixed liquid (reaction liquid), almost no cotton-like gel was generated, and the stability (rate of increase) was 2%.
It was below.

Comparative Example Mixing was carried out in the same manner as in Example 2, except that the rotary blade 5 was replaced with a stirring blade.

As a result of carrying out a homogeneity test of the obtained mixed liquid (reaction liquid), generation of some fluffy gel was observed and the stability (rate of increase) was 6%.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a typical embodiment of a liquid mixing apparatus of the present invention.

FIG. 2 is a partial sectional view showing a conventional liquid mixing device.

FIG. 3 is a partial cross-sectional view showing a typical embodiment of the liquid mixing apparatus of the present invention.

FIG. 4 is a sectional view showing a typical embodiment of the liquid mixing apparatus of the present invention.

FIG. 5 is a partial sectional view showing a typical embodiment of the liquid mixing apparatus of the present invention.

[Explanation of symbols]

 1 Liquid Supply Port 2 Liquid Supply Port 3 Liquid Mixing Chamber 4 Cylindrical Nozzle 5 Rotating Blade 6 Rotating Shaft 7 Driving Device 8 Swirling Flow Generation Blade 9 Stirring Blade

Front page continuation (72) Inventor Kenzo Uozumi 2-5 Chikudo-Hachimancho, Shinjuku-ku, Tokyo Within Japan Construction Machinery Trading Co., Ltd.

Claims (1)

[Claims] 1. A liquid mixing chamber having at least two liquid supply ports and a cylindrical nozzle connected to the liquid mixing chamber,
A liquid mixing apparatus, characterized in that, inside the outlet side of the cylindrical nozzle, a rotary blade is provided which operates so as to generate a liquid flow in a direction opposite to a flowing liquid flow.