JP2002248330A - Continuously mixing device of powder and liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuously mixing device of powder and liquid which improves uniform mixing of the powder and liquid by jetting and feeding the liquid additionally in the case of dispersing and abutting the powder onto the liquid and which facilitates the smooth and continuous manufacture of the uniform mixed fluid of the powder and the liquid by simplifying the constitution of a rotary mixing board here shearing action is lowered in the continuously mixing device of the powder and the liquid constituted so as to disperse and abut the powder onto the continuously fed liquid and to obtain the uniform mixing fluid of the powder and the liquid through the rotary mixing board. SOLUTION: The continuously mixing device of the powder and the liquid constituted so as to disperse and abut the powder onto the continuously fed liquid and to obtain the uniform mixing fluid of the powder and the liquid through the rotary mixing board is provided with a jetting nozzle 18 constituted and arranged for the purpose of jet-feeding the liquid in the case of dispersing and abutting the powder to the liquid so as to improve the uniform mixing of the powder and liquid and the rotary mixing board 20 consisting of simple constitution obtained by reducing shearing action and discharging the uniform mixed fluid of the powder and liquid by centrifugal action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a liquid film that naturally flows down in a thin film form, by continuously contacting a powder while dispersing the powder, and by continuously mixing under a negative pressure condition. The present invention relates to a powder and liquid continuous mixing apparatus configured to obtain a uniform mixed fluid of powder and liquid.

[0002]

2. Description of the Related Art Today, it is indispensable to handle powder when molding or processing various materials in industrial fields such as chemicals, chemicals, plastics, electronics, food, ceramics, machinery, and metals. When handling such powders,
A continuous mixing device of a powder and a liquid is known as a necessary device or device in each of the main steps in production technology such as dispersion, fixed-rate supply, molding, and inter-process transportation.

Therefore, conventionally, as a continuous mixing apparatus of this kind of powder and liquid, when powder is humidified, slurried, suspended or emulsified, the powder and liquid are continuously mixed. A continuous mixing device of a powder and a liquid capable of mixing and supplying a fixed amount has been proposed and put into practical use.

[0004] The applicant of the present invention has previously described a continuous mixing device for powder and liquid, in which the liquid and powder are continuously and uniformly mixed at a certain ratio, and the liquid is supplied from the upper edge of the circumference. Mixing of a liquid and a powder configured to apply an event that forms on a very stable thin-film flow surface after overflow to one liquid and disperse and abut the other powder to achieve mixing The device was developed and a patent was obtained (Japanese Patent Publication No. 48-22511).

[0005] That is, the mixing device for liquid and powder according to the above proposal comprises a supply cylinder provided at the center of the upper portion so that the powder to be mixed is sequentially dropped, and a rotary dispersion member for uniformly dispersing the powder. And a lower storage tank into which the liquid to be mixed is continuously supplied from the outside, and a hollow inverted truncated conical overflow tank provided inside the storage tank, The liquid continuously overflowing from the upper edge of the tank is caused to flow down in a thin film form along the inner wall surface of the overflow tank, and the powder from the rotary dispersion is brought into contact with the liquid flowing down in a thin film form. In addition, the rotary dispersion and the overflow tank are arranged in the above-mentioned configuration, and a stirring tank for promoting the mixing of the powder and the liquid is further provided below the overflow tank.

In the liquid / powder mixing apparatus thus constructed, the liquid to be mixed with the powder overflows from the upper end edge of the fixed hollow inverted frustoconical overflow tank. In this way, an extremely stable liquid film is formed, which flows down slowly and naturally along the conical wall according to the amount of water flowing into the overflow tank. Since it flows down while abutting and mixing, it is mechanically completely different from the conventional apparatus, and good uniform mixing can be achieved.

[0007] Thereafter, the present applicant utilizes the above-mentioned mixing device for liquid and powder, and mixes the oil system formed into a thin film with the water system with an air current such as air containing solid fine powder such as a coal additive. A continuous injection mixer and an emulsifier capable of mechanically and continuously producing an emulsified fuel and an emulsified colloidal fuel simply and efficiently without using an emulsifier as in the prior art by emulsifying the mixture by shearing and stirring. Succeeded in developing a method for producing colloidal fuel (Japanese Patent Publication No. 54-1732)
No. 9).

[0008]

However, the mixing apparatus according to the above proposal, however, is widely used for coating materials such as paper, adhesives, various film materials, emulsifiers, soil improvers, mortar work additives and the like. In the case of continuously producing an aqueous solution of (polyvinyl alcohol), when mixing PVA powder as a raw material and a liquid, a large shear force acts on the PVA powder, particularly in a stirring tank, and a large amount of foam is generated in the PVA aqueous solution. There are difficulties to do.

[0009] PVA (polyvinyl alcohol)
Is also known as Povar, PVAL, etc., is a water-soluble synthetic polymer, has the appearance of a white powder, has an apparent specific gravity of 0.3 to 0.7, and has a thermal stability and thermoplasticity of 100 to 140 ° C. And has many excellent physicochemical properties especially as a coating material and the like, so that it has a wide range of uses as described above.

Particularly, in the conventional mixing apparatus, after the powder comes into contact with the liquid flowing down in the form of a thin film along the inner wall surface of the overflow tank, the powder is uniformly mixed with the liquid. A stirring tank is provided below the overflow tank to promote mixing of the powder and the liquid. In this case, the stirring tank has a configuration in which a rotary mixing plate provided with various scraping blades and scraping blades for scraping and scraping a mixed fluid of powder and liquid is provided. For this reason, the rotary mixing disk having the above-mentioned structure gives a strong shearing action and a centrifugal action to the mixed fluid of the powder and the liquid, and guides the mixed fluid to the discharge portion while increasing the mixing and stirring. Therefore, due to the above-described arrangement of the stirring tank and the rotary mixing plate, a large amount of bubbles are generated during the continuous production of the above-mentioned PVA aqueous solution or the like, and many measures are taken to treat the bubbles. However, a satisfactory solution has not yet been proposed and implemented.

The present inventors have conducted intensive studies and studies, and as a result, have found that when powder is brought into contact with a liquid flowing down in a thin film along the inner wall surface of an overflow tank, sufficient powder is applied. In addition to increasing the dispersibility of the powder in the liquid by increasing the injection means of the liquid so as to achieve uniform mixing, and promoting the fluidization of the powder, the structure of the rotary mixing plate is simplified to allow the liquid to be mixed with the powder. To easily and easily perform continuous production of a homogeneous mixed fluid of powder and liquid by centrifugal action while reducing the shearing action on the mixed fluid, that is, appropriate and smooth continuous production of a PVA aqueous solution in which generation of bubbles is suppressed. It has been found that it is possible to obtain a continuous mixing device of powder and liquid that can be produced.

That is, as described above, a part of the supplied liquid is directed to the part of the inner wall surface of the overflow tank where the continuously supplied liquid flows down in the form of a thin film and the injection means is provided. By providing the powder, the liquid that has been dispersed and contacted with the liquid flowing down in the form of a thin film is further supplied by spraying the liquid, whereby the mixing and dispersibility of the powder and the liquid can be improved, and The transfer speed of the mixed fluid of the powder and the liquid can be accelerated, and the uniform mixing of the powder and the liquid is combined with the centrifugal action by the rotation of the rotary mixing plate, which has a simple structure with reduced shearing action. Continuous production of fluid can be achieved smoothly and quickly.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a powder which is constituted so that a powder is dispersed and brought into contact with a continuously supplied liquid and a uniform mixed fluid of the powder and the liquid is obtained via a rotary mixing plate. In the continuous mixing device of the body and the liquid, when the powder is dispersed and brought into contact with the liquid, the liquid is further injected and supplied to enhance the uniform mixing of the powder and the liquid, and the shearing action of the rotary mixing plate is reduced. Another object of the present invention is to provide a continuous mixing apparatus of a powder and a liquid which has a simple configuration and can facilitate smooth and continuous production of a uniform mixed fluid of the powder and the liquid.

[0014]

In order to achieve the above object, a continuous mixing apparatus for a powder and a liquid according to the present invention disperses and abuts a powder on a continuously supplied liquid and a rotary mixer. In a continuous mixing device of the powder and the liquid configured to obtain a uniform mixed fluid of the powder and the liquid via, when the powder is brought into contact with the liquid in a dispersed manner, the liquid is jetted and supplied,
An injection nozzle arranged and arranged to enhance the uniform mixing of the powder and the liquid is provided, and has a simple structure in which the shearing action is reduced, and the uniform mixed fluid of the powder and the liquid is discharged by the centrifugal action. It is characterized in that a rotary mixing plate is provided.

That is, in the continuous mixing apparatus for powder and liquid according to the present invention, the liquid flows down as an annular overflow film so as to surround the opening of the powder supply cylinder for continuously supplying powder in a constant amount. An overflow cone is provided, a mixing chamber provided with a rotary mixing disk concentrically with the overflow cone is formed below the overflow cone, and an outlet for a mixed fluid of powder and liquid is provided at a part of the outer periphery of the mixing chamber. For a mixed fluid of powder and liquid flowing down in a part of the overflow cone in the form of an annular overflow film, comprising a continuous mixing device of powder and liquid.
An injection nozzle for injecting and supplying a liquid is provided.

In this case, the liquid to be jetted and supplied from the jet nozzle may be configured to supply the liquid stored in the overflow tank to be supplied to the overflow cone at a liquid level differential pressure.

Further, the liquid to be jetted from the jet nozzle is supplied so as to be pressure-adjustable through a branch water supply pipe which is the same water supply source and branches off from a water supply pipe communicating with an overflow tank which supplies the overflow cone. It can also be configured.

[0018] On the other hand, the rotary mixing plate may be provided with at least one scraping blade for performing a scraping operation on the ceiling of the mixing chamber on the outer periphery of the upper portion of the circular rotary plate.

In addition, the rotary mixing plate protrudes to a position close to the opening of the powder supply cylinder on the upper rotating shaft thereof, and a dispersion developing cone for dispersing and developing the powder is integrally provided at a tip end thereof. It can be configured.

Further, a discharge port for a mixed fluid of powder and liquid provided at a part of the outer periphery of the mixing chamber provided with the rotary mixing disk extends tangentially to the outer circumference of the rotary mixing disk. A structure in which a gate is provided can be employed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a continuous mixing apparatus for powder and liquid according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a continuous mixing apparatus for powder and liquid according to the present invention. That is, in FIGS. 1 and 2, reference numeral 10 denotes a powder supply cylinder which is connected to a powder quantitative supply device or the like (not shown) and continuously supplies a required powder at a constant rate. An overflow tank 12 is provided at an opening 10a of the cylinder 10 so as to surround the opening 10a, and an overflow cone 14 through which a required liquid flows down from the center of the overflow tank 12 as an annular overflow film.
Is provided. In addition, a water supply pipe 16 for continuously supplying a required liquid is connected to the overflow tank 12 provided with the overflow cone 14.

In this embodiment, however, a plurality of injection nozzles 18 are provided at a relatively lower position of the overflow cone 14 so as to be directed obliquely downward. The injection nozzle 18 has, for example, a base opening inside the overflow tank 12, and is directed toward the inside of the overflow cone 14 by the differential pressure of the liquid level inside the overflow tank 12. It is configured to jet and supply the liquid inside.

Further, a mixing chamber 22 provided with a rotary mixing plate 20 concentrically with the overflow cone 14 is provided below the overflow cone 14. A discharge port 24 is provided on one side of the mixing chamber 22. The discharge port 24 is provided with the rotary mixing plate 20.
The mixed fluid of the powder and the liquid which is transferred along with the rotation of the rotary mixing plate 20 in a direction tangential to the outer periphery of the
There is provided a gate 25 for appropriately guiding the vehicle.
At least one scraping blade 26 that performs a scraping operation on the ceiling of the mixing chamber 22 is provided on the outer periphery of the upper part of the rotary mixing plate 20. Further, a dispersion and deployment cone 28 for projecting and dispersing a mixed fluid of powder and liquid falling from the overflow cone 14 in a centrifugal direction and protruding is provided at an upper central portion of the rotary mixing plate 20. ing.

As described above, the rotary mixing plate 20 constructed and arranged in the mixing chamber 22 has one end 30a of the rotary drive shaft 30 connected to the lower center and the other end of the rotary drive shaft 30. By connecting the portion 30b to the drive output shaft 36a of the electric motor 36 via the driven pulley 32, the transmission belt 33, and the drive pulley 34, the rotation drive can be appropriately controlled.

According to the apparatus for continuously mixing powder and liquid in the present embodiment, the liquid supplied to the overflow tank 12 flows from the upper end of the overflow cone 14 in accordance with the inflow amount. It naturally flows down into a thin film along its inner wall surface. The powder supply cylinder 1
The powder supplied from the 0 opening 10a flows down while abutting and mixing. However, in the present embodiment, the liquid is jetted and supplied by the differential pressure of the liquid level inside the overflow tank 12 from the jet nozzle 18 provided below the overflow cone 14 so that the liquid flows down the overflow cone 14. In the above, the uniform mixing of the powder in contact with the liquid into the liquid can be enhanced.

Next, the mixed fluid of the powder and the liquid thus obtained falls into the mixing chamber 22, and is rotated by a dispersing and developing cone 28 projecting from the center of the mixing chamber. 20 is sufficiently mixed while being uniformly dispersed in the centrifugal direction, and the liquid can be smoothly guided and discharged to the discharge port 24 by the centrifugal force. In this case, the rotary mixing disk 20 is configured as a very simple circular rotary disk, and for example, a single scraping blade 26 for performing a scraping operation on the ceiling of the mixing chamber 22 is provided as shown in the figure. It is preferable to adopt a configuration in which the shearing action on the powder is reduced and the centrifugal action can be effectively exerted by using only the powder.

FIGS. 3 and 4 show a modification of the injection nozzle 18 provided in the overflow cone 14 of the continuous mixing apparatus in the present embodiment described above. That is,
In FIG. 3, in addition to the injection nozzle 18 in the embodiment shown in FIG. 1, a plurality of injection nozzles 19 are provided above the overflow cone 14 and directed downward. In this case, when the liquid is supplied to the injection nozzle 19, a part of the water supply pipe 16 that is communicated from the required water supply source to the overflow tank 12 via the water supply pump P and the filter F is branched and appropriately. Branch water supply pipe 16 provided with flow control valve V
With a, the discharge pressure is supplied so as to be adjustable.

FIG. 4 shows the supply of the liquid to the injection nozzle 18 shown in FIG. 3 separated from the overflow tank 12 and, similarly to the injection nozzle 19 shown in FIG. , A branch water supply pipe 16b provided with a flow control valve V as appropriate
Thus, the discharge pressure is supplied so as to be adjustable. As described above, when supplying the liquid to the plurality of injection nozzles 19, 18 through the branch water supply pipes 16a, 16b, respectively, the respective injection nozzles 19, 18
It is preferable to use a pipe that maintains a uniform discharge pressure.

FIG. 5 shows a further modification of the above-described continuous mixing apparatus for powder and liquid in this embodiment. For convenience of description, the same components as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

That is, in FIG. 5, a dispersion developing cone 28 'protruding from the center of the upper portion of the rotary mixer 20 is provided.
Is extended to a position where the tip is close to the opening 10 a of the powder supply cylinder 10. With such a configuration, the opening 10 of the powder supply cylinder 10 is formed.
The powder dropped and supplied from the liquid jetting nozzle a collides with the dispersion developing cone 28 ′ in advance, and is appropriately and smoothly uniformly dispersed on the thin film-like liquid flowing down from the overflow cone 14. Combined with the liquid jetting action of 18, 19, uniform mixing of powder and liquid can be more effectively achieved.

Therefore, as a result of continuous production of an aqueous PVA solution using the apparatus for continuously mixing a powder and a liquid according to the present invention having the above-described structure, generation of bubbles is suppressed, and extremely smooth and excellent PVA is obtained. It was confirmed that the production of an aqueous solution could be achieved.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. For example, the set positions and the set numbers of the injection nozzles provided in the overflow cone 14 and the liquid supply means Not only can they be set arbitrarily, but also many other design changes can be made without departing from the spirit of the present invention.

[0034]

As is clear from the above-described embodiment, the continuous mixing apparatus for powder and liquid according to the present invention disperses and abuts the powder on the continuously supplied liquid and at the same time through the rotary mixing plate. In a continuous mixing device of powder and liquid configured to obtain a uniform mixed fluid of powder and liquid, the liquid is jetted and supplied when the powder is dispersed and brought into contact with the liquid, and the powder is mixed with the liquid. In addition to providing an injection nozzle arranged and arranged to enhance uniform mixing, a simple structure in which the shearing action is reduced is provided, and a rotary mixing plate that discharges a uniform mixed fluid of the powder and the liquid by centrifugal action is provided. With this configuration, when the powder is dispersed and contacted with the liquid, the liquid is further sprayed and supplied to increase the uniform mixing of the powder and the liquid, and the rotary mixer has a simple configuration that reduces the shearing action. , Powder and liquid It is possible to facilitate the smooth and continuous production of homogeneous fluid mixture.

That is, in the continuous mixing apparatus for powder and liquid according to the present invention, the liquid is caused to flow down as an annular overflow film so as to surround the opening of the powder supply cylinder for continuously supplying the powder at a constant rate. An overflow cone is provided, a mixing chamber provided with a rotary mixing disk concentrically with the overflow cone is formed below the overflow cone, and an outlet for a mixed fluid of powder and liquid is provided at a part of the outer periphery of the mixing chamber. An injection nozzle for supplying a liquid to a mixed fluid of powder and liquid flowing down in a shape of an annular overflow film in a part of the overflow cone is provided. In this way, while the liquid is flowing down with the overflow cone, uniform dispersion and uniform mixing of the powder and the liquid are sufficiently achieved. The smooth and continuous production of homogeneous fluid mixture of the powder and the liquid can be achieved Te. Therefore, the continuous mixing device for powder and liquid according to the present invention, PV
It can be effectively used for continuous production of A aqueous solution and the like.

[Brief description of the drawings]

FIG. 1 is a schematic partial cross-sectional side view showing an embodiment of a continuous mixing device for powder and liquid according to the present invention.

FIG. 2 is a cross-sectional view of the continuous mixing apparatus for powder and liquid shown in FIG.
It is principal part sectional drawing A.

FIG. 3 is a schematic explanatory view showing a configuration example of a liquid supply means for supplying a liquid to an overflow tank and an injection nozzle in the continuous mixing apparatus of powder and liquid shown in FIG.

FIG. 4 is a schematic explanatory view showing a modified example of the liquid supply means applicable to the overflow tank and the injection nozzle of the apparatus for continuously mixing powder and liquid according to the present invention.

FIG. 5 is a schematic partial cross-sectional side view showing a modification of the continuous mixing device for powder and liquid shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Powder supply cylinder 10a Opening 12 Overflow tank 14 Overflow cone 16 Water supply pipe 16a, 16b Branch water supply pipe 18, 19 Injection nozzle 20 Rotary mixer 22 Mixing chamber 24 Discharge port 25 Gate 26 Scrape blade 28, 28 'Dispersion Deployment cone 30 Rotation drive shaft 30a, 30b End of rotation drive shaft 32 Followed pulley 33 Transmission belt 34 Drive pulley 36 Electric motor 36a Drive output shaft P Water pump F Filter V Flow control valve

Claims (7)

[Claims] 1. A continuity of a powder and a liquid configured to disperse and abut the powder on a continuously supplied liquid and obtain a uniform mixed fluid of the powder and the liquid via a rotary mixing plate. In the mixing device, when the powder is dispersed and brought into contact with the liquid, the liquid is jetted and supplied, and the jet nozzle arranged so as to enhance the uniform mixing of the powder and the liquid is provided, and a simple configuration in which the shearing action is reduced. And a rotary mixing plate for discharging a uniform mixed fluid of the powder and the liquid by centrifugal action. 2. An overflow cone for flowing liquid as an annular overflow film is provided so as to surround an opening of a powder supply cylinder for continuously supplying a constant amount of powder, and is provided concentrically with a lower portion of the overflow cone. Forming a mixing chamber with a rotary mixing plate, and a continuous mixing device of powder and liquid, provided with an outlet for a mixed fluid of powder and liquid at a part of the outer periphery of the mixing chamber, An apparatus for continuously mixing powder and liquid, comprising an injection nozzle for injecting and supplying a liquid to a mixed fluid of powder and liquid flowing down in a part of an overflow cone in the form of an annular overflow film. 3. The powder according to claim 2, wherein the liquid jet-supplied from the jet nozzle is a liquid stored in an overflow tank to be supplied to an overflow cone and supplied by a differential pressure at a liquid level. Continuous mixing device with liquid. 4. The method according to claim 1, wherein the liquid to be jetted from the jet nozzle is supplied in a pressure-adjustable manner through a branch water supply pipe which is the same water supply source as a water supply pipe branched from a water supply pipe communicating with an overflow tank for supplying an overflow cone. 3. The continuous mixing device of a powder and a liquid according to claim 2, wherein: 5. The rotary mixing disk according to claim 1, wherein at least one scraping blade for performing a scraping operation on a ceiling of the mixing chamber is provided on an outer periphery of a circular rotary disk. A continuous mixing device for the powder and the liquid according to the above. 6. The rotary mixing plate is provided with a dispersion developing cone integrally protruding from an upper rotating shaft thereof to a position close to an opening of a powder supply cylinder and dispersing and developing a powder at a tip end thereof. The continuous mixing device for a powder and a liquid according to any one of claims 1 to 5, characterized in that: 7. An outlet for a mixed fluid of powder and liquid provided at a part of the outer periphery of the mixing chamber provided with the rotary mixing disk, extends tangentially to the outer circumference of the rotary mixing disk. 7. The continuous mixing device for powder and liquid according to claim 1, further comprising a gate.