JPH0615193A - Jet mill - Google Patents

Abstract

PURPOSE:To improve pulverizing performance and energy efficiency by providing a cylinder and annular flow passages within a body constituting a hollow circular truncated cone shape and pulverizing the raw materials supplied into the respective flow passages by collision against wall surfaces, etc., then bringing the raw materials into vigorous collision against each other in the confluent part of the two flow passages. CONSTITUTION:The body 1 constituting the hollow circular truncated cone shape, a discharge pipe 7 inserted inward from the central part atop the body 1 and an inside cylindrical part 6 of the hollow circular truncated cone shape provided to enclose the discharge pipe 7 within the upper space of the body 1 are provided. The outer annular flow passage R1 and the inner annular flow passage R2 are formed in the body 1. Further, a first air feed pipe 12 for feeding air from approximately the tangential direction of the inside of the flow passage R1 into the flow passage, a second air feed pipe 13 which feeds the air into the flow passage 2 from its approximately tangential direction, raw material supply ports 8, 9 formed in the body 1 and an air feeder 10 for feeding the air into the air feed pipes 12, 13 are provided. The air is fed from the air feed pipes 12, 13 into the flow passages R1, R2 by the air feeder 10 and is swirled in opposite directions within the respective routes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizing apparatus for subdividing a solid raw material or the like to obtain finer powder, and in particular, a high-speed air flow is generated in a hollow main body, and the air flow causes the high speed air flow in the main body. The present invention relates to a jet mill that grinds fed raw materials.

[0002]

2. Description of the Related Art Crushing is one of the unit operations that have been frequently performed since ancient times in various fields such as milling, pigment production, ore processing, and food processing. It is increasing. In particular, crushing is an indispensable step in today's food processing technology, which requires various tastes, shapes, colors, etc., and the efficiency of the crushing step has a great influence on the quality of productivity. For this reason, various crushing devices are installed in current food processing factories, etc., and the crushing process is automated and efficient.

[0003] As this crushing device, a crushing device for crushing raw materials by mechanically moving parts is mainly known at present, but when a crushing device of this kind is used, in order to obtain dried powder particles, Drying process of raw material or crushed raw material is required in the process or the post process,
There was a limit to the efficiency improvement of the whole manufacturing process. For example, in the case of producing konjac potato, first, dried konjac potato, to produce a dried powder particles by applying the dried konjac potato to a pulverizer, then add water and additives to the jet. It is manufactured by kneading and cooling.
Since it takes a very long time to dry the konjac potato in this manufacturing process, it was not possible to expect many effects only from the crushing device in order to improve the efficiency of the entire manufacturing process.

On the other hand, a so-called jet jet mill has been developed, which does not have the above-mentioned mechanically movable parts and crushes raw materials by the action of an air flow.
This jet mill blows high-speed air into a frustoconical body to generate a swirling airflow that swirls in a certain direction, and agitates the raw materials supplied into the body by the swirling airflow.
The raw materials are crushed by collision between the raw materials and collision between the inner surface of the main body and the raw materials. In this device, since the raw material is dried at the same time as the pulverization by the frictional heat generated by the swirling air flow, the pulverization step and the drying step can be performed in one step, and the manufacturing process can be simplified. Has been evaluated.

[0005]

However, in the jet mills developed so far, since the raw material is crushed by the swirling airflow in a certain direction, it is necessary to obtain a sufficient crushed state. It requires a considerably large amount of power energy, and it cannot be said that it is sufficient in terms of crushing capacity, etc., and further improvement was required for its practical application.

The present invention has been made in view of the above problems, and an object thereof is to achieve excellent energy efficiency and crushing ability in a jet mill which crushes raw materials by an air flow.

[0007]

According to the present invention, there is provided a main body having a hollow truncated cone shape whose diameter is reduced as it goes downward and a crushed material discharge port is formed at a lower end portion, and an inner portion from a central portion of an upper surface of the main body. Between the outer surface of the inner cylinder and the inner surface of the main body by providing an exhaust pipe inserted in one direction and a hollow frustoconical inner cylinder provided so as to surround the exhaust gas in the upper space of the main body. A first air supply pipe that forms an outer ring flow path, forms an inner ring flow path between the inner cylinder and exhaust gas, and further supplies air into the outer ring flow path from a substantially close direction thereof, A second air supply pipe for supplying air into the inner return passage from a substantially close direction, a raw material supply port formed in the main body, and an air supply device for supplying air to the first and second air supply pipes. Is provided, and air is supplied from each of the air supply pipes to each annular flow by the air supply device. By feeding within, it is obtained so as to generate a high-speed swirling airflow swirling to the respective opposite directions to each annular flow path.

[0008]

In the present invention, after the raw materials supplied into the respective flow paths are crushed by the collision with the wall surface and the collision of the raw materials with each other, the raw materials which flow in different directions at the confluent portion of both the flow paths are violently violent. Collide and crush.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a main body held by a leg L. The main body 1 has a frustoconical shape whose diameter decreases as it goes downward, and has a structure in which an upper portion 2, an intermediate portion 3, and a lower end portion 4 are connected.

Reference numeral 5 is a lid for closing the upper opening of the upper portion 2, and an inner cylinder 6 is fixed to the central portion of the lid 5. The inner cylinder 5 has a truncated cone shape whose diameter decreases as it goes downward, and is inserted into the upper portion 2. As a result, an annular air passage (hereinafter, this passage is referred to as an outer passage) R1 is formed between the inner surface of the upper portion 2 and the inner cylinder 5 as shown in FIGS. 2 and 3. It 7
Is an exhaust pipe inserted and fixed in the center of the inner cylinder 6, the upper end of which projects above the inner cylinder 6 and the lower end of which is located slightly below the inner cylinder 6. 2 and 3 are provided between the outer peripheral surface of the exhaust pipe 7 and the inner peripheral surface of the inner cylinder 3.
As shown in FIG. 3, an annular air flow path (hereinafter, this flow path is referred to as an inner annular flow path) R2 is formed. Reference numeral 8 is a first supply cylinder for feeding the raw material into the outer annular flow path R1 and communicates with a supply port 5b formed in the lid body 5. Reference numeral 9 denotes a second supply cylinder for supplying the raw material into the inner annular flow path R2, which communicates with a supply port 5a formed in the inner cylinder 6.

On the other hand, in FIG. 3, 11 is a main air supply pipe connected to the compressor 10 as an air supply device,
A first air supply pipe 12 and a second air supply pipe 13 are connected to the tip of the main air supply pipe 11 in a V-shape. Of these, the first air supply pipe 12 is connected to the first air supply port 2a formed in the upper peripheral wall of the upper portion 2, and the second air supply pipe 13 is the second air supply pipe 13 formed in the upper peripheral wall of the inner cylinder 3. It is connected to the air supply port 3a. Further, the first and second air supply pipes 12 and 13 supply air to the respective annular flow paths in a close-to-close direction, and the supplied air is directed to different directions in the respective annular flow paths R1 and R2. It is connected to rotate (see FIG. 3). In addition, V1, V
Reference numerals 2 and V3 are valves for limiting the air flow rate in each of the air supply pipes 12 and 13.

Next, the operation will be described based on the above configuration.
The compressed air sent from the compressor 10 to the main air supply pipe 11 is divided into the first air supply pipe 12 and the second air supply pipe 13, and then the respective air supply pipes 12 and 13 make the respective annular flow paths R1.
Ejected into R2. The air jetted into each of the annular flow passages R1 and R2 is jetted toward the close battle direction of each of the annular flow passages R1 and R2, so that about 100 m / sec along the wall surface of each of the flow passages R1 and R2. A swirling air flow that swirls at high speed. The swirling directions of the respective air flows are different from each other.

Here, the raw material to be crushed, for example, raw konjac potato M is directly supplied from each supply cylinder 8 and 9 to each reflux path R.
1 and R2, when they are put into the respective return paths R1 and R
It swirls at a high speed according to the airflow generated in the inside of the 2, and moves to the lower side of each return passage while being crushed by the collision with the wall surface of each return passage and the collision of raw materials. Further, below each of the reflux paths R1 and R2, the violent collisions of the raw materials with each other are repeated according to the air currents that swirl in opposite directions, and the collision with the inner wall of the intermediate portion 3 is also added to pulverize the particles into extremely fine particles. And finally discharged from the exhaust port.

Further, in the above pulverization process, heat is generated in the main body 1 due to the friction of the air flowing at high speed, especially the friction between the air streams having different swirling directions in the intermediate portion 3.
Therefore, the raw material is pulverized while being overheated and dried by the frictional heat, and the powder particles finally discharged from the discharge port can be almost completely dried. In addition,
The air sent to the intermediate portion 3 from each of the recirculation paths R1 and R2 has a high temperature, and thus rises in the exhaust cylinder and is discharged to the outside.

As described above, in this embodiment, first, the raw materials are crushed in the inner and outer annular flow passages R1 and R2, and then the raw materials that have passed through the respective annular flow passages R1 and R2 are made to collide with each other. Therefore, compared with the conventional one that generates an air flow that swirls in one direction,
Grinding capacity and energy efficiency are greatly improved.

In the above embodiment, the raw materials are supplied into the annular flow paths R1 and R2 separately from the supply cylinders 8 and 9, but instead of the supply cylinders 8 and 9, As shown in FIG. 4, a bifurcated supply cylinder 15 may be provided, and according to this, the raw material is supplied into each of the annular flow paths R1 and R2 by charging the raw material from a single raw material input port 15a. Therefore, the work of charging the raw materials can be simplified.

The crushing device according to the present invention is not limited to soft ones such as konjac potato, but can also be applied to crushing concrete pieces having high rigidity.

[0018]

As described above, in the jet mill according to the present invention, by providing the inner cylinder in the hollow frustoconical body, two inner and outer annular flow passages are formed in the body and By sending air into the flow passage from the close direction, high-speed swirling air currents that swirl in opposite directions along each flow passage are generated. The crushing capacity and energy efficiency are significantly improved, and the running cost can be significantly reduced, as compared with the one generating the air flow.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main body according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of what is shown in FIG.

FIG. 3 is a plan view of the above embodiment.

FIG. 4 is a side view showing a modification of the supply pipe in the above embodiment.

[Explanation of symbols]

 1 Main Body 2 Upper Part 4a Crushed Material Discharge Port 6 Inner Cylinder 7 Exhaust Cylinder 10 Compressor (Air Supply Device) 12 First Air Supply Pipe 13 Second Air Supply Pipe R1 First Annular Flow Path R2 Second Annular Flow Path

Claims (1)

[Claims] 1. A main body having a hollow truncated cone shape whose diameter decreases as it goes downward and having a crushed material discharge port formed at a lower end thereof, and an exhaust pipe inserted inward from a central portion of an upper surface of the main body. A hollow circular truncated cone-shaped inner cylinder provided so as to surround the exhaust gas and the like in the upper space of the main body, thereby providing an outer return path between the outer surface of the inner cylinder and the inner surface of the main body. An inner ring flow path between the inner ring flow path and the exhaust gas, and a raw material supply port for supplying the raw material to be crushed to each of the ring flow paths, and an air flow in the outer ring flow path from a substantially close direction. A first air supply pipe for supplying air, a second air supply pipe for supplying air into the inner annular flow path from a substantially close direction, and an air supply device for supplying air to the first and second air supply pipes Is provided, and air is supplied from each of the air supply pipes by the air supply device. The high-speed air currents of the spiral shape that swirl in opposite directions are generated in each annular flow path by feeding into the annular flow path, and the raw material supplied into the main body is crushed by each high-speed air flow. A crushing device characterized by the above.