JP2598292Y2 - Stock solution distributor for centrifugal spray - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stock liquid distributor for centrifugal spraying, and more particularly to a method for supplying a stock solution of a slurry of ceramic slurry to a centrifugal spray dryer at a uniform flow rate and flow rate.

[0002]

2. Description of the Related Art A ceramic molded body is formed by drying a stock solution of a slurry of ceramic slurry by a drying device to obtain a granular material, and pressing and firing the granular material. In the conventional centrifugal spray-drying apparatus shown in FIG. 4, a rotating shaft 103 is inserted into a stock solution supply pipe 102 arranged at the center of the upper portion of a drying chamber 101, and the lower end of the rotation shaft 103 is connected to the stock solution supply pipe 102 at the lower end. Spray board 104 is fixed with a gap interposed.

A hot air inflow portion 105 to the drying chamber 101 is formed outside the stock solution supply tube 102, and a hot air tube 106 is connected to the hot air inflow portion 105. The lower part of the drying chamber 101 is formed in a tapered shape having a large diameter at the upper part and a small diameter at the lower part. The opening 109 of the exhaust pipe 108 is positioned above the product outlet 107, and is opened to the atmosphere by the exhaust pipe 111 with the cyclone 110 interposed.

Here, when the stock solution G of the slurry slurry in the form of a slurry is supplied to the spray board 104 rotated by the rotating shaft 103 via the stock solution supply pipe 102, the spray board 104 is rotated. The undiluted solution G is sprayed outside the spray board 104.
When hot air is supplied to the drying chamber 101 through the hot air pipe 106 and the hot air inflow section 105, the sprayed undiluted solution G supplied to the drying chamber 101 is dried to become powder and granules, and the product outlet 10
Fall from 7.

The exhaust is exhaust pipe 108, cyclone 110, exhaust pipe
Released to the atmosphere via 111. Note that the particles contained in the exhaust gas are separated by the cyclone 110. By the way, there are the following stock solution distributors (distributors) for supplying the stock solution G of the slurry slurry in the form of a slurry to the centrifugal spray drying apparatus. Some of the stock solution outlets shown in FIGS. 5A and 5B have a plurality of round holes. In this stock solution distributor 201, one stock solution tube 203 is connected to a dish-shaped distributor 202, and a plurality of round holes 204 are formed in the bottom of the distributor 202. This is a basic type of stock solution distributor in which a stock solution G reservoir 205 is provided above the distributor 202 and one stock solution tube 203 is connected.

Further, there is a stock solution outlet having a slot as shown in FIGS. 6 (a) and 6 (b). This stock solution distributor 301
Has two undiluted tubes 303 connected to a container-like distributor 302, and an annular slot (groove shape) 3 at the bottom of the distributor 302.
04 is engraved. This is also the stock solution G at the top of the distributor 301
And a stock solution pipe 303 is connected to two places.

Next, there is a stock solution outlet having a spiral hole as a stock solution outlet shown in FIGS. 7 (a) and 7 (b). This stock solution distributor 401
In the figure, one stock solution pipe 403 is connected to a cylindrical container-like distributor 402, and a plurality of spiral holes 404 are cut in the lower part of the distributor 402, and the upper part thereof is a pool of the stock solution G. A portion 405 is formed.

[0008]

The above-mentioned conventional stock solution distributors 201, 301, and 401 each have a stock solution G reservoir 206, 306, or 406 in each of the distributors 202, 302, and 402. Once the undiluted solution G is stored, the round hole 204, the slot 304, the spiral hole 40
The stock solution G is distributed from 4 and the stock solution G is quantitatively supplied to a centrifugal spray dryer.

However, when the stock solution G of the slurry slurry to be handled has a viscosity of 10 to 1000 cps, a high sedimentation property and a high drying property, the distributors 202, 302, and 302.
In 402, the powder in the stock solution G may settle and harden.
For such a stock solution G, the capacity of a centrifugal spray drying apparatus,
As long as the specification of the shape (size, distribution) of the granulated particles is allowed, the supply amount of the stock solution G is increased and the distributors 202, 302,
Methods have been taken to prevent sedimentation and drying in 402.

However, in order to produce fine particles,
In some cases, the supply amount of the stock solution G cannot be increased, and the distributor 202
The stock solution G settles and sticks in 302 and 402, making it impossible to uniformly supply the stock solution G to the centrifugal dryer. In some cases, the round holes 204, the slots 302, and the spiral holes 404 are clogged. Was. In the distributor 202 having the round hole 204 shown in FIG. 5, the stock solution G stays in the reservoir 205, and the stock solution G sinks and is easily fixed.

In the distributor 302 having the slot 304 shown in FIG.
Is supplied, and a slight flow of the stock solution G occurs in the reservoir 305, but is not enough to prevent sedimentation and sticking. Further, the distributor 402 having the spiral holes 404 shown in FIG. 7 also has a reservoir 405 as in the case of the distributor 202 shown in FIG. 5, so that the undiluted solution G is settled and fixed.

That is, in the reservoirs 205, 305, 405 of the respective distributors 202, 302, 402, when the supply amount of the stock solution G is reduced, a stagnant portion of the stock solution G is formed, and the centrifugal spray-drying apparatus operates during the drying operation. Then, the undiluted solution G adheres in the distributors 202, 302, and 402, and the fixed amount of the undiluted solution G cannot be supplied to the centrifugal spray dryer.

[0013]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a centrifugal spray-drying apparatus which can supply a stock solution to a centrifugal spray-drying apparatus in any state. A centrifugal spray stock solution distributor for supplying a stock solution such as a ceramic slurry, wherein the stock solution is received from the upper portion, and the stock solution is supplied from the lower portion to the centrifugal spray-drying device, the stock solution tube having a bent end or The centrifugal spray-drying device is a stock solution distributor for centrifugal spraying provided with a stirring mechanism that generates a swirling flow of the stock solution by providing a stirring blade protruding from a rotating shaft of the centrifugal spray-drying device.

[0014]

There is a mechanism for generating a swirling flow of the stock solution, which prevents sedimentation and sticking of the powder in the stock solution, and enables the stock solution to be quantitatively supplied to the centrifugal spray dryer in any state.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on specific embodiments shown in the accompanying drawings. In the present invention, when the stock solution G of the slurry slurry is supplied to the distributor, the stock solution G flowing into the distributor generates a swirling flow in the same rotation direction as the spray plate of the centrifugal spray-drying device, and is always distributed by itself. The inside of the vessel is kept in a stirring state to prevent the settling of the stock solution G from occurring.

As a mechanism for generating this swirling flow, as shown in FIG. 1, the supply tip 3a of the stock solution pipe 3 to the distributor 2 is bent by approximately 90 ° and bent to enter the stock solution G into the distributor 2. The swirling flow indicated by the arrow may be generated by utilizing the force flowing into the swirling flow. A rotary shaft 6 for a spray disk of a centrifugal spray drying apparatus is inserted through the center of the distributor 2.
Is connected to a stock solution pipe 3 for supplying
Is bent in the same direction as the rotating shaft 6, and the flow of the stock solution G is formed in the same direction as the rotating shaft 6. At the bottom of the distributor 2, a slot 4 for supplying the stock solution G to the centrifugal spray-drying device is provided. In addition, the bending angle of the distal end portion 3a of the stock tube 3 is
The angle is not limited to 90 °, but may be any angle that generates a swirling flow.

As a method of generating a swirling flow, as shown in FIG. 2, a stirring blade 17 is provided on a rotating shaft 16 for rotating a spray plate of a centrifugal spray-drying device and housed in a distributor 12. There is a method of mechanically stirring the stock solution G. That is, one stock solution pipe 13 for supplying stock solution G is connected to the upper part of the distributor 12, and the rotating shaft 16 of the spraying board is located in the distributor 12,
The rotation is immediately used for stirring the stock solution G. At the bottom of the distributor 12, a slot 14 for supplying the undiluted solution G to the centrifugal spray dryer is cut. Further, the number of the stirring blades of the rotary shaft 16 is not limited to two, and a number suitable for stirring can be provided.

Further, as shown in FIG. 3, when the stock solution pipe 23 is attached to the distributor 22, each stock solution pipe 23 is bent horizontally at the upper part of the distributor 22 so that the stock solution G generates a swirling flow. The same effect can be obtained by providing such that the inflow direction is the rotation direction. Note that reference numeral 26 denotes a rotation shaft of the centrifugal spray-drying device. Here, a test for distributing and supplying ceramic slurry was performed using the stock solution distributor of the present invention shown in FIG. 1 and the stock solution distributor of FIG. 5 which is a comparative example. As a stock solution of the ceramic slurry, those having an apparent viscosity of about 50 cps containing PVA and PEG and those having an apparent viscosity of about 2000 cps containing high-molecular-weight acrylic were used.
After each use for 5 hours, the presence or absence of clogging of the stock solution supply hole was examined.

As shown in Table 1, the results are as follows.
There was no difference in the case of about cps, but the apparent viscosity was 2000 cps
In the case of the degree, most of the supply holes were clogged in the comparative example, whereas no clogging occurred in the example of the present invention, and excellent results were shown.

[0020]

[Table 1]

[0021]

As described above, the present invention is a centrifugal spray stock solution distributor for supplying a stock solution such as a ceramic slurry to a centrifugal spray drying device, which receives the stock solution from the upper part and centrifugal spray from the lower part. In the distributor for supplying the undiluted solution to the drying device, a stirring mechanism for generating a swirling flow of the undiluted solution is provided by providing a undiluted solution tube having a bent end or a stirring blade protruding from the rotating shaft of the centrifugal spray drying device. Since the centrifugal spray stock solution distributor is composed of a stock solution having a high sedimentation property, the stock solution can be stably supplied without being fixed even in the distributor.

Further, according to the present invention, since the undiluted solution is uniformly supplied to the spraying board of the centrifugal spray drying apparatus, it is possible to consistently supply a uniform dry powder during operation. further,
In the present invention, since the coarse liquid spray is not supplied from the distributor, the coarse liquid spray is prevented from adhering to the inner wall of the drying chamber of the centrifugal spray-drying apparatus, and the yield is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view and a transverse sectional view of two specific embodiments of the present invention.

FIG. 2 is a vertical sectional view and a plan view of another embodiment of the present invention.
FIG.

FIG. 3 is a perspective view of still another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional centrifugal spray drying apparatus.

FIG. 5 is a vertical sectional view and a bottom view of the conventional centrifugal spray stock solution distributor.

FIG. 6 is a vertical sectional view and a bottom view of another conventional centrifugal spray stock solution distributor.

FIG. 7 is a vertical cross-sectional view and a bottom view of another conventional stock solution distributor for centrifugal spraying.

[Explanation of symbols]

 G: undiluted solution 2, 12, 22: distributor

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01D 1/20 B05B 3/10 F26B 3/12

Claims (1)

(57) [Scope of request for utility model registration] 1. A centrifugal spray stock solution distributor for supplying a stock solution such as a ceramic slurry to a centrifugal spray drying device, wherein the stock solution is received from an upper portion and the stock solution is supplied from a lower portion to the centrifugal spray drying device. A stock solution distributor for centrifugal spraying, comprising a stock solution tube having a bent bent end or a stirring blade protruding from the rotating shaft of the centrifugal spray drying device to generate a swirling flow of stock solution.