JPH02149327A - Mixing device - Google Patents

Abstract

PURPOSE:To disperse a second fluid in a state of fine particle diameter into a first fluid to be mixed therewith by imparting reciprocating motion to the first fluid near a partition wall by means of a vibration member, promoting thereby the separation from the partition wall of the second fluid, which has passed and seeped through the partition wall. CONSTITUTION:A first and second fluid are admitted into a vessel 20 to be mixed with each other therein. In the vessel 20, a flow chamber 34 is provided to allow the first fluid to flow therethrough. And in the vessel 20, a partition wall 26 composed of porous material is formed to separate a closed chamber 32 from the chamber 34. The second fluid is admitted under pressure into the closed chamber 32 by a means 36. Further, a vibration member 38 which is vibrated by a vibrator 40 is disposed in the chamber 34 of the vessel 20. Reciprocating motion of the first fluid near the partition wall 26 is effected by means of the vibration member 38 so that the first fluid is mixed with the second fluid, while the separation of the second fluid, which has passed and seeped through the partition wall 26, is being promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mixing device for mixing two different fluids, and particularly to one for effectively dispersing and mixing a second fluid in a first fluid.

[Background Art] Conventionally, in various industrial fields, a plurality of different fluids, ie, fluids such as liquids, liquids, and gases, have been mixed. In particular, in chemical processing or food processing, a mixing device that can perform efficient and uniform mixing is desired. An example of such a mixture is a mixture of water and oil, in which oil is dispersed as fine particles in water to form an emulsion. Such mixing is generally carried out by storing both fluids in a mixing tank, and stirring and mixing them strongly with a stirring blade that is driven by a motor and rotates at high speed.

However, in this mixing method, even with very strong stirring, it takes a considerable amount of time to disperse the oil in water with a fine particle size (usually less than 10μ), and it also consumes a large amount of electricity. Was.

A system as shown in FIG. 5 is also known as a system for improving such drawbacks. In the figure, a storage tank 10
A first fluid (eg, water) is stored in the reservoir. This first fluid is then pumped into a mixing device 14 by a pump 12.
It will be distributed to. The fluid leaving the mixing device 14 is then returned to the storage tank 10. Therefore, the fluid in the storage tank 10 is circulated through the pump 12 and the mixing device 14, during which time a mixing process is performed.

The mixing device 14 is partitioned into two sealed chambers 14a and 14b by a partition wall 16.
The fluid in the storage tank 10 is directly passed through the chamber 14a, but a second fluid (for example, oil) is pressurized into the sealed chamber 14b.

Here, since the partition wall 16 is formed of a porous material, a portion of the second fluid press-fitted into the sealed chamber 14b will permeate and flow out to the sealed chamber 14a side. Therefore,
The partition wall 16 has very fine pores (for example, about 1 μm), and the second fluid oozes out as very small particles toward the closed chamber 14a.

Since the first fluid flows through the sealed chamber 14a at a certain flow rate, the second fluid is entrained by the first fluid flowing therein, and the second fluid is dispersed as fine particles. A mixed liquid is obtained in the storage tank 10.

According to the system shown in FIG. 5, the partition wall 16
The pore size allows the second fluid with a predetermined particle size to be dispersed in the first fluid, and a very effective mixing process can be performed.

[Problems to be Solved by the Invention] However, in the conventional mixing device as shown in FIG. 5, the first fluid must flow into the closed chamber 14a at a certain flow rate.

That is, when the flow rate of the first fluid flowing into the sealed chamber 14a is very low, the second fluid that has passed through the partition wall 16 and permeated
The fluid does not separate from the partition wall until the second fluid has a considerably large diameter on the surface on the side of the sealed chamber 14a. Therefore, the particle size of the second fluid dispersed in the first fluid becomes extremely large. In order to avoid such a situation, it is necessary to flow the fluid at a considerably high speed into the closed chamber 14a of the mixing device 14 to quickly separate the second fluid from the surface of the partition wall 16.

In order to cause the fluid to flow through the mixing device at high speed in this manner, either the surface area of the partition wall 16 must be made very large, or the amount of fluid pumped by the pump 12 must be made very large. There is a practical limit to the area of the partition wall 16, and this is actually achieved by increasing the flow rate of the pump 12.

Increasing the flow rate of the pump 12 in this way means that the amount of the second fluid dispersed in the fluid mixing device 14 during one flow is reduced, and in this system, There has been a problem in that a desired amount of the second fluid cannot be dispersed into the first fluid without a considerable number of cycles. Furthermore, when such a large amount of circulation is performed, there are problems in that the power consumption of the pump increases, resulting in poor energy efficiency and the time required for the mixing process.

The present invention has been made with the aim of solving the above-mentioned problems, and provides a mixing device that can efficiently mix two fluids while reducing the flow velocity of the fluid within the mixing device. The purpose is to

[Means for Solving the Problems] A mixing device according to the present invention includes a container into which first and second fluids are introduced and in which these fluids are mixed, and a container provided in the container in which the first fluid is mixed. A circulation chamber in which the fluid is circulated, a sealed chamber partitioned from the circulation chamber by a partition wall made of a porous material within the container, means for introducing a second fluid under pressure into the sealed chamber, and a circulation chamber in the container. and a vibrating member arranged in the vibrating device and vibrated by the vibrating device, the vibrating member reciprocates the first fluid near the partition wall, and the second fluid oozes out through the partition wall. It is characterized in that the first and second fluids are mixed while promoting separation from the wall.

[Function] The first fluid is introduced into the circulation chamber in the container and passes therethrough. On the other hand, the second fluid is introduced under pressure into the sealed chamber in the container, permeates the partition wall that partitions the circulation chamber and the sealed chamber, and oozes out toward the circulation chamber.

Here, in the present invention, a vibrating member that is vibrated by a vibrating device is arranged in a closed chamber inside the container. Therefore, vibrations are applied to the fluid in the circulation chamber, and the first fluid on the surface of the partition wall on the circulation chamber side vibrates, that is, moves back and forth. Therefore, the speed of the reciprocating movement of the first fluid promotes separation of the second fluid that has oozed out through the partition wall from the partition wall. As a result, the second fluid can be mixed with fine particle size dispersion in the first fluid while maintaining a small flow rate of the first fluid flowing in the circulation chamber.

[Example] Hereinafter, a mixing device according to an example of the present invention will be described based on the drawings.

FIG. 1 is a front sectional view of the first embodiment. The container 20 has a hollow cylindrical shape, and an inflow pipe 22 for a first fluid (for example, water) is connected to the bottom thereof, and an outflow pipe 24 through which the mixed liquid after the mixing process flows out is connected to the top. ing.

A large number of pipes 26 are arranged in the middle of the container along the fluid flow direction, and the outer peripheral sides of the upper and lower ends of the pipes 26 are closed by a closing plate 28.3o. Therefore, the fluid flowing in from the inflow pipe 22 flows only inside the pipe 26.

On the other hand, the space surrounded by the outside of the pipe 26, the closing plate 28.3o, and the inner periphery of the container is a sealed chamber 32, which is separated from a circulation chamber 34 through which the fluid flowing from the inflow pipe 22 reaches the outflow pipe 24. It will form a space.

An introduction pipe 36 for introducing a second fluid (second fluid) is connected to this sealed chamber 32. For this reason,
If the second fluid is introduced into the closed chamber 32 under pressure through the introduction pipe 36, the pipe 26 will be pressurized from the outside. By forming the pipe 26 with a porous material, the second fluid can permeate and flow from the outside of the pipe 26 to the inside.

Further, in the present invention, a disc-shaped diaphragm 38 is disposed as a vibration member in the circulation chamber 34a corresponding to the upper space of the container 2o. This diaphragm 38 is vertically vibrated by a vibrating device 40, and a shaft 42 connected to the vibrating device 40 is attached to the center thereof, and the upper end of this shaft 42 is connected to a connecting member 44. It is connected to an eccentric shaft 48 via a crank arm 46.

This eccentric shaft 48 is connected to the main shaft 52 of the pair of motors 50.
Since the motor 50 rotates, the crank arm 4 rotates.
The upper ends of the shafts 6 make the same pivoting motion, which causes the connecting portion 44, the shaft 42, and the vibrating member 38 to vibrate up and down. Therefore, due to the vertical vibration of this diaphragm 38, the circulation chamber 3
It is also possible to apply vertical vibration to the fluid inside 4. Note that the inverter 54 supplies electric power at a predetermined frequency to the motor 50, and can control the rotation speed by changing this frequency. Further, a diaphragm 56 is disposed at the sliding portion between the container 20 and the shaft 42, thereby sealing the sliding portion.

In such a device, the first fluid flows in through the inflow pipe 22 and flows out through the flow chamber 34 through the outflow pipe 24 .

When the second fluid is pressurized into the sealed chamber 32 at a predetermined pressure, for example, about 5 kg/cm2, it passes through the pipe 26 and flows out from the inner surface thereof as shown in FIG.

Here, in the present invention, vertical vibration is applied to the fluid in the circulation chamber 34 by the diaphragm 38. Therefore, the fluid moves back and forth with respect to the pipe 26 even near the inner peripheral surface of the pipe 26. Therefore, the second fluid flowing out onto the inner surface of the pipe 26 is separated from the inner surface of the pipe 26 before its particle size increases and is dispersed into the first fluid.

As described above, according to the device of the present invention, separation of the second fluid from the surface of the pipe 26 is promoted by the reciprocating movement of the first fluid caused by the vibration of the diaphragm 38. Therefore, even if the flow rate of the fluid from the inflow pipe 22 toward the outflow pipe 34 in the circulation chamber 34 is very slow, sufficient mixing can be achieved. Therefore, unlike the above-mentioned conventional example, a large-capacity pump is not required, and a storage tank is also not required.

Here, the above-mentioned pipe 26 can be made of various porous materials, such as ceramics, but porous silica glass is particularly suitable. That is, it is preferable to use shirasu glass, which is a volcanic ejecta (shirasu) abundant in southern Kyushu, as a raw material.

This porous shirasu glass is first made by adding lime and boric acid to shirasu and melting it at 1300°C to synthesize a basic glass that becomes the matrix of the porous glass. Then, after forming this material into a pipe shape according to the final purpose of use,
Heat treatment is performed at about 750° C. to change the structure of the glass and generate a phenomenon in which the raw materials CaO and B2O3 are liberated, that is, layer separation occurs. Since this layer is easily soluble in acid, if the heat-treated product is treated with acid, this layer will be eluted and a porous glass having countless fine pores can be produced. The porous silica glass produced in this manner is very suitable as a material for forming the partition wall of the present invention because its pore diameter etc. can be easily controlled during processing.

FIG. 3 shows a second embodiment of the mixing device according to the invention. Here, the same members as in the first embodiment described above are given the same reference numerals, and their explanations will be omitted. In this embodiment, a transport member 60 and a stirring blade 62 are attached to the shaft 42 in place of the diaphragm 38 in FIG. Therefore, inside the circulation chamber 34, these transport members 6
0, the stirring blade 62 will vibrate up and down. and,
These vertical vibrations impart vertical vibrations to the fluid within the circulation chamber 34 .

Here, the transport member 60 has a conical shape, and its cross-sectional area increases upwardly. When the transport member 60 having such a shape is vibrated vertically, the resistance when moving downward is different from the resistance when moving upward, and the resistance when moving downward is small. Distribution room 3
It is possible to impart an upward transport force to the fluid within 4.

Therefore, according to this embodiment, even if the first fluid is not pressurized into the inflow pipe 22, the pump can be omitted due to the transport action of the transport member 60.

Further, the stirring blade 62 has a plurality of half-moon-shaped segments 6.
2a is attached at an angle with respect to the shaft 42, and a pair of segments 62a are attached with their inclination directions opposite to each other.

A plurality of pairs of segments 62a are attached at predetermined intervals in the vertical direction with different phases. Therefore, by vibrating the stirring blade 62, the second fluid dispersed in the first fluid can be crushed on the surface of the stirring blade 62, and the second fluid can be further finely divided.

Furthermore, in this second embodiment, an electromagnetic drive type vibration device 40 is employed. That is, the vibration device 40 includes an outer fixed coil 70 and a movable coil 72 attached to the shaft 42. Then, the movable coil 72 vibrates up and down in accordance with the magnetic field generated in the fixed coil 70 by electric power of a predetermined frequency supplied from the inverter 54 .

Furthermore, FIG. 4 shows another embodiment of the transport member 60, in which a disk 80 is provided with a number of conical holes 82 that widen downward. Such a transport member 60
When it is vibrated up and down, there is a difference in the resistance when moving downward and when moving upward, and it is possible to impart an upward transport force to the fluid. In addition, the transportation member 6 in FIG.
0 can also be adopted in place of the transport member 60 in FIG. 3, but it can be used in place of the diaphragm 38 shown in FIG.
A moving force may be applied to the fluid.

In addition, in the above example, a pipe was used as a partition wall, but if it is possible to partition the circulation room and the closed room,
Its shape does not matter. Further, it is preferable that the material thereof is appropriately selected depending on the types of the first and second fluids.

Furthermore, FIG. 6 shows a spiral stirring blade 70 that can be used in place of the stirring blade 62 in the second embodiment shown in FIG. Even if this stirring blade 70 is employed, the same effects as in the above case can be obtained. Note that the open lowers 0a are formed on the stirring blades 70 at predetermined intervals to promote turbulent flow.

FIG. 3 is a front sectional view showing the configuration of the second embodiment, FIG. 4 is a sectional view showing the main part configuration of another embodiment of the transport member 60, and FIG. 5 explains the configuration of a conventional mixing system. FIG. 6 is a schematic diagram showing another embodiment of the stirring blade.

[Effects of the Invention] As explained above, according to the mixing device according to the present invention,
The vibrating member applies a reciprocating force to the first fluid near the partition wall, and promotes separation of the second fluid that has seeped out from the partition wall, so that the second fluid that has passed through the partition wall and has seeped out is separated from the partition wall. Second
It is possible to disperse and mix fluids with fine particle size.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the configuration of a mixing device according to a first embodiment of the present invention, Fig. 2 is an explanatory diagram for explaining the mixing state in the same embodiment, Container pipe (partition wall) Closed chamber circulation Room vibration device diaphragm (vibration member)

Claims (1)

[Claims] (1) A container into which first and second fluids are introduced and in which they are mixed; a circulation chamber provided within this container through which the first fluid flows; and a porous material inside the container. A sealed room is separated from the circulation room by a partition wall, and a second
a means for introducing a fluid under pressure; and a vibrating member disposed in a circulation chamber in the container and vibrated by a vibrating device, the vibrating member reciprocating the first fluid near the partition wall. A mixing device, characterized in that the first and second fluids are mixed while promoting separation of the second fluid that has oozed out from the partition wall through the partition wall.