JPS59132926A - Separation mechanism of stirring medium - Google Patents

Abstract

PURPOSE:To prevent the lowering of maintenance and the quality lowering of a treated liquid, by attaching a ring to a mixing tank, mounting an inverted cone disc to a rotary shaft, and further providing a partition plate to which a guide pipe is fixed in a suspended state on said disc. CONSTITUTION:A ring 20 is attached to the inner wall of a mixing tank 6 and an inverted cone disc 21 to a rotary shaft 12 while a partition wall which is opened in the vicinity of the rotary shaft 12 and has a guide tube 27 fixed to the under surface thereof in close vicinity to the perihery of the opening part around said shaft 12 in a suspended state and reaching the opening provided to the upper end of the inverted cone disc 21 is attached so as to be positioned above said inverted cone disc 21. Because the lowering of maintenance in mixing and the quality lowering of a treated liquid are prevented by this mechanism, the capacity and efficiency enhancement of a mixing apparatus can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separation mechanism for separating a stirring medium and a mixed liquid in an apparatus for mixing a liquid and a solid or a liquid and a liquid by applying rotational power to small particles of the stirring medium.

Mixing devices are widely used in the industrial field for producing paints, dyes, inks, cosmetics, various coating materials, and the like. Recently, there has been a trend towards finer particles being mixed in order to improve quality and expand applications. In general, fine particles have strong adhesion and agglomeration properties, making it difficult to uniformly mix them on a microscopic level.

For mixing of fine particles, it is preferable to use a device that mixes liquids and solids by introducing small particles of stirring medium into a mixing tank and forcibly stirring them using the rotational power of stirring blades, as this increases the mixing speed. be. An example of this type of device is a sand grinder (US Pat. No. 2,581,414) shown in FIG. This mixing device is composed of a cylindrical mixing tank 6, a stirring medium 7 such as glass beads or alumina balls of 1 to 2 diameters filled in the mixing tank 6, and a disc 8 attached to a rotating shaft 12. Ru.

The rough mixed liquid 2 roughly mixed by the rough mixer 1 is pulp 3
After passing through the check valve 5 by the pump 4 through the mixing tank 6
supplied to The liquid supplied to the mixing tank 6 is forcibly stirred together with the stirring medium 7 by the centrifugal force of the disk 8, and at this time, the liquid and solids are mixed due to the shear stress caused by the difference in flow speed between the stirring medium 7 and the liquid. . The mixed liquid is gradually transferred to the mixing tank 6.
After the stirring medium 7 is separated by the screen 11, it is taken out of the system as a processing liquid 13.

The screen 11 that separates the stirring medium 7 and the mixed liquid in the above device is provided around the upper circumference of the mixing tank 6, and is exposed to the outside air so that the state of separation between the stirring medium 7 and the mixed liquid can be constantly monitored. ing. Therefore, the solvent in the processing liquid 13 evaporates due to the heat of stirring, and the screen 11 is clogged with solid particles in the mixed liquid or the agitated medium 7 which has become smaller due to wear. This not only makes continuous operation impossible unless the screen 11 is frequently cleaned, but also causes the mixed liquid to overflow outside the system, reducing the maintainability of the mixing operation. Furthermore, since air is drawn in from the outside during high-speed stirring, the mixed liquid tends to foam, which slows down the uniform mixing time. Further, the mixed liquid is splashed onto the inner wall of the mixing tank 6 by the centrifugal force of the disk 8. Therefore, the mixed liquid is pressed against the inner wall of the mixing tank 6, and a part of the mixed liquid rises up the inner wall of the mixing tank 6 and flows out into the processing liquid 13.
There are disadvantages such as a decrease in the quality of the mixed liquid. On the other hand, the worn stirring medium 7 not only clogs the screen 11, but also the more worn stirring medium 7 flows out of the system through the screen 11, causing a decrease in the quality of the processing liquid 13.

The present invention has been made in order to improve the drawbacks of the prior art as described above, and its purpose is to improve the stirring medium separation mechanism, thereby reducing the maintainability of mixing operations, and further improving the processing The purpose is to prevent the quality of the liquid from deteriorating.

As a result of studying the stirring medium separation mechanism to achieve the above objectives, we found that in order to maintain the maintainability of the mixing operation and prevent the quality of the treated liquid from deteriorating, an inverted truncated conical ring with open upper and lower ends was installed on the inner wall of the upper part of the mixing tank. having a plurality of apertures in the side wall having a similar shape to the ring and positioned within the ring, and
An inverted truncated conical disk with only the upper end open is attached to the rotating shaft or the mixing tank, the gap between the ring and the inverted truncated conical disk is made narrower than the particle size of the small particles of the stirring medium, and further, only the vicinity of the rotating shaft is opened, A partition plate having a guide pipe hanging down and fixed to the lower surface of the peripheral band of the opening into the opening of the upper end of the inverted truncated conical plate is attached to the mixing tank so as to be located above the inverted truncated conical plate, and the small particles of the stirring medium are mixed with the partition plate. It was experimentally discovered that it is sufficient to separate the mixed liquid.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 is a schematic flow diagram of the main parts of a mixing device equipped with an agitating medium separation mechanism according to the present invention, and components similar to or identical to those in FIG. 1 are indicated using the same reference numerals. FIG. 3 shows a detailed diagram of the stirring medium separation mechanism in FIG. 2.

First, as shown in FIG. 3, the stirring medium separation mechanism is composed of a ring 20 in the shape of an inverted truncated cone, a truncated cone disk 21 similar to the ring 20, and a partition plate 22 made of an M-shaped disk. The ring 20 has its upper and lower ends open, and is sandwiched between flanges 30 and 32 provided at the top of the mixing tank 6, and is fixed to the mixing tank 6 by tightening the seven flanges 30 and 32 with bolts 43. 0 ring 31 has 7 lunges 30 and 32
This prevents the mixed liquid from flowing out of the system.

The truncated conical disk 21 has an opening 25 only at the upper end and a plurality of holes 40 in the side wall, and is connected to a cylinder 41 so as to be located inside the ring 20, and the cylinder 41 is attached to the rotating shaft 12. It is fixed. The partition plate 22 made of an M-shaped disk has an opening 35 near the axis, and a cylindrical guide tube 27 parallel to the axis is connected to the truncated conical plate 21 on the lower surface near the opening 35.
It is inserted into the opening 25 at the upper end, is sandwiched between seven flanges 30 and 32 in the same way as the ring 20, and is fixed to the mixing tank 6 so as to be positioned above the truncated conical disk 21. . On the other hand, a slight gap 24 is maintained between the ring 20 and the truncated cone disk 21, and the gap 24 is between the truncated cone disk 21 and the ring 20.
is adjusted by moving up and down in the axial direction, and the particle diameter of the stirring medium 7 is adjusted to 1
It is maintained at about /10.

Further, the gap 26 between the truncated conical disk 21 and the partition plate 22 made of an M-shaped disk is maintained at a size that allows the agitation medium 7 to sufficiently pass through, and the cylindrical guide tube 27 is connected to the space 3 of the truncated conical disk 21.
It is set so that it is located within 3. In addition, truncated conical disk 2
A gap 36 between the opening 25 of 1 and the cylindrical guide tube 27 of the partition plate 22, and a gap 34 between the cylindrical guide tube 27 and the cylinder 41.
is maintained such that the stirring medium 7 can sufficiently pass through.

Further, the gap 28 between the opening 35 of the partition plate 22 made of an M-shaped disk and the cylinder 41 is kept small at about 1/20 of the particle diameter of the stirring medium 7, The diameter of the gap 28 is also the same as that of the gap 28. The mixed liquid flows out from the mixing tank 6 to the outside of the yarn in the order of gaps 24, 26, 36.
34 and 28, and the mixed liquid outlet 23 is located at 1/1 of the distance from the inner wall of the mixing tank 6 to the rotating shaft 12.
2 is located closer to the axis. The operation will be explained below.

In Fig. 2, the mixed liquid supplied to the mixing tank 6 is uniformly mixed by the shear stress generated between the stirring medium 7 and the mixed liquid due to the centrifugal force of the disk 8, and moves up the mixing tank 6, separating the stirring medium. reach the department. After the stirring medium 7 is separated in the stirring medium separating section, the mixed liquid is taken out of the system as a processing liquid 13 from an outlet 23 near the center of the shaft through gaps 24, 26, 36, 34 and 28.

In this embodiment, the stirring medium separation part is immersed in the mixed liquid and provided in the mixing tank 6, so as to be cut off from the outside air. Therefore, evaporation of the solvent in the processing liquid 13 in the stirring medium separation section is reduced, and clogging due to solid particles in the mixed liquid can be prevented. In addition, there is no air entrainment into the system, which reduces foaming of the mixed liquid and shortens the time required for uniform mixing.

Furthermore, this is taken into consideration because the free surface of the mixed liquid is high on the inner wall of the mixing tank 6 and low near the axis when the stirring medium separation mechanism rotates 80 times. That is, the ring 20 is formed into an inverted truncated cone shape so as to correspond to the free surface of the mixed liquid, and an inverted truncated conical disk 21 having a similar shape to this ring is formed into the ring 20.
In addition, the liquid outlet is located closer to the shaft than 1/2 of the distance from the inner wall of the 23-ft mixing tank to the rotating shaft. Therefore, the mixed liquid in the stirring medium separating section, especially in the inner wall of the mixing tank 6, flows diagonally downward toward the center of the shaft.
The flow returns to the mixed liquid phase. Therefore, unlike the conventional method, the mixed liquid is pressed against the inner wall of the mixing tank 6 by the centrifugal force of the disk 8, and a part of the mixed liquid that reaches the stirring medium separation part through the inner wall of the mixing tank 6 is processed. No phenomenon of leakage into the liquid was observed. On the other hand, the truncated conical disk 21 and the partition plate 22 made of an M-shaped disk can prevent the stirring medium 29, which has worn out over time during mixing, from flowing into the processing liquid 13. In other words, the agitation medium 29 that has worn down to the size of the gap 24 or less,
After passing through the gaps 24 and 26 together with the mixed liquid, the truncated conical disk 2 is guided through the cylindrical guide tube 27 through the gap 36.
1 into the space 33.

Here, most of the mixed liquid flows out of the system through the gaps 34 and 28. However, a part of the mixed liquid in the space 33 is injected into the gap 24 from the opening 40 of the truncated conical disk 21, and while this process is repeated, it flows out into the processing liquid 13 through the gaps 34 and 28. In addition, the abrasion agitation medium 29I'i that has entered the space 33, the aperture 40 and the gap 28 are
Since the particle size is smaller than 0, the particles are retained in the space 33 without flowing out into the processing liquid 13.

The retained abrasion stirring medium 29 is recovered by removing the truncated conical disk 21 from the rotating shaft 12 after the mixed liquid in the space 33 is discharged from the opening 40 by the rotational power at the end of the operation. Therefore, there is no phenomenon in which the stirring medium 7 is worn out and flows out of the screen portion, which deteriorates the quality of the processing liquid 13, as in the conventional case.

Next, the present invention will be explained in detail using specific examples. Using the same mixing device of the conventional method and the present invention with an internal volume of 2j,
A mixing experiment was conducted under the conditions shown in Table 1.

Table 1 Mixing Experiment Conditions Here, the mixing degree of the treatment liquid was determined when the sample was treated for 217 hours. Here, the treatment liquid with a mixing degree/I'i of 20 og was filtered for 1'S' using a filter equipped with a 3 μm filter cloth.
The amount of filtration when filtered for 1 minute under / cm G pressure was determined and expressed as the weight ratio of this amount of filtrate to the charged amount of 20'Og. The experimental results are shown in Figure 4. As is clear from FIG. 4, in the method of the present invention (graph A), the mixing time is 4
At 0 minutes, the degree of mixing is constant at 95% by weight. This value shows that the amount of the filtered liquid was 1909 out of the 2009 treated liquid prepared as described above. This means that almost the entire amount of the charged liquid was filtered, excluding the loss due to adhesion to the filter, etc., and that uniform mixing was achieved in a mixing time of 40 minutes. On the other hand, in the conventional method (graph B), even after 40 minutes of mixing time, the mixing degree of the liquid did not reach 95%, indicating that uniform mixing was not achieved.

Other embodiments of the stirring medium separation mechanism are shown in FIGS. 5 and 6. The above object can be achieved by replacing the partition plate 22 made of an M-shaped disk shown in FIGS. 2 and 3 with a cylindrical partition plate 50 shown in FIG. 5 and a truncated conical partition plate 60 shown in FIG. The same effect as the stirring medium separation mechanism obtained can be obtained.

In all of the above embodiments, in the stirring medium separation mechanism, the inverted truncated conical disk 21 is connected to the cylinder 41 and attached to the rotating shaft 12. However, as shown in FIG. 7, even if a disk 45 is directly connected to the inverted truncated conical disk 21 and the disk 45 is attached to the mixing tank, the same effect as the stirring medium separation mechanism described above can be obtained.

According to the present invention, the maintainability in mixing is reduced, and furthermore,
Since deterioration in the quality of the processing liquid can be prevented, the performance and efficiency of the mixing device can be greatly improved.

[Brief explanation of drawings]

Fig. 1 is a flow diagram of the entire mixing process using a conventional mixing device, Fig. 2 is a schematic flow diagram of the main parts of the mixing device attached to the stirring medium separation mechanism of the present invention, and Fig. 3 is the middle part of Fig. 2. FIG. 4 is an enlarged sectional view showing details of the stirring medium separation mechanism according to the present invention, and FIG. 4 is a relationship diagram between mixing time and mixing degree in the mixing tank.
FIG. 5, FIG. 6, and FIG. 7 are enlarged sectional views showing other embodiments of the stirring medium separation mechanism according to the present invention. 6... Mixing tank, 7... Stirring medium, 8... Disc, 1
2... Rotating shaft, 20... Ring, 21... Inverted truncated conical plate, 22.50.60... Partition plate, 24... Gap, 25... Opening, 27... Guide Pipe, 35... Opening, 40... Opening, 45... Disc Patent Applicant: Hitachi Maxell Co., Ltd.
40 50 60 Mixing time (min) Figure 5 Figure 6

Claims (1)

[Claims] 1. Attach a rotating shaft to the center of the cylindrical mixing tank, attach a stirring blade to the rotating shaft, and place small particles of stirring medium such as glass beads or alumina balls on the stirring blade to mix liquid and solid or liquid. In the mixing device for mixing, an inverted truncated conical ring with open upper and lower ends is attached to the inner wall of the upper part of the mixing tank, and a plurality of openings are formed in the side wall in a similar shape to the ring so as to be located within the ring, and An inverted truncated conical disk with only the upper end open is attached to the rotating shaft or the mixing tank, the gap between the ring and the inverted truncated conical disk is made narrower than the particle size of the small particles of the stirring medium, and further, only the vicinity of the rotating shaft is opened, A stirring device characterized in that a partition plate having a guide pipe hanging down and fixed to the lower surface of the peripheral band of the opening and extending into the opening of the upper end of the inverted truncated conical plate is attached to the mixing tank so as to be located above the inverted truncated conical plate. Media separation mechanism