JPH077745U - Pulverizer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fine pulverizer capable of removing the adhering factor generated in the part of the raw material supply nozzle, stably supplying the raw material, and continuously producing a certain fine powder. [Structure] A raw material supplied from a raw material supply port 2 is mixed with a high-speed air stream ejected from a raw material supply nozzle 4 in a solid-gas mixing chamber 3 and then collided with a collision body 8 to pulverize particles in the air stream. A plurality of raw material supply nozzles 4 were provided around the raw material supply port 2 in a fine pulverizer that further swirls and pulverizes by a high-speed air flow by a swirling and pulverizing nozzle 10 provided on the circumference of the collision body 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fine pulverizer for finely pulverizing powder and granules using high-pressure gas, and in particular it is possible to prevent the powder and granules from adhering in the solid-gas mixing part of the raw material supply part of the powder and granules. The present invention relates to a fine pulverizer capable of improving the dispersibility of powder in a stream.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there is known a fine pulverizer using a high-pressure gas as a raw material to obtain finely pulverized powder from a finely divided powder or granular material as a raw material. For example, in a fine pulverizer disclosed in Japanese Patent Publication No. 63-17501, a nozzle for ejecting a high-speed air flow is provided in the center of a solid-gas mixing chamber, and a raw material is supplied from a raw material supply port around the nozzle. The surrounding gas and solid (raw material) are sucked into the jet flow generated at the tip of the nozzle and mixed into the jet, and then introduced into the accelerating tube. It collides and primary crushing is performed.

[0003]

[Problems to be solved by the device]

 However, in the fine pulverizer described in Japanese Patent Publication No. 63-17501, the air flow in the solid-gas mixing chamber is due to the surrounding gas flow drawn into the high-speed flow at the nozzle tip and gravity acting on the solid. Due to the flow, the wall surface of the solid-gas mixing chamber and the outer surface of the nozzle had many parts that were not easily affected by the air flow. For this reason, the fine powder contained in the raw material gradually adheres to this wall surface and tends to narrow the passage of the raw material and the secondary air flow, which causes the passage of the raw material with the passage of operating time. There was a problem that the supply amount became small and the stability of the supply amount was hindered.

Further, in the case of a substance having extremely strong adhesiveness, a phenomenon occurs in which the solid-gas mixing chamber is clogged and the supply of raw materials is stopped. Such a phenomenon causes a change in the grain size of the product, and there is a problem that the product cannot be produced.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate the adhering factor generated in the part of the raw material supply nozzle, stably supply the raw material, and continuously produce a certain fine powder. It is to provide a fine crusher capable of doing.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the fine pulverizer of the present invention mixes the raw material supplied from the raw material supply port with the high-speed airflow ejected from the raw material supply nozzle in the solid-gas mixing chamber and then collides it with the impactor. In a fine pulverizer which pulverizes particles in an air stream by a high-speed air stream by a rotary pulverizing nozzle provided on the circumference of the collision body, the raw material supply nozzle is placed around the raw material supply port. It is characterized in that a plurality of them are provided.

[0007]

[Action]

 According to the present invention having the above-described configuration, since the raw material supply nozzle that ejects the high-speed airflow is provided around the raw material supply port, the solid-gas mixing chamber wall surface and the outer surface of the raw material supply port are high-speed jetted from the raw material supply nozzle. Will come into contact with the flow. That is, since the raw material is supplied to the central space, the raw material is drawn into the high-speed flow and accelerated without approaching the wall surface where the flow speed is slow. Therefore, it is possible to prevent the adhesion of the raw material to the wall surface, which has been a problem in the conventional technique.

Further, even if the raw material adheres to a part of the wall surface, when the adhered material grows and grows in a range affected by the high-speed flow, the adhered material partially contacts with the high-speed airflow. Peel off. As a result, the growth of the deposit does not reach until the quantitativeness of the supply amount is impaired.

[0009]

【Example】

 Hereinafter, an embodiment of a fine pulverizer according to the present invention will be described with reference to FIGS. FIG. 1 is a vertical cross-sectional view showing the entire structure of the fine pulverizer, and in FIG. 1, reference numeral 1 is a raw material supply hopper. A raw material supply port 2 extends from the lower end of the raw material supply hopper 1, and the raw material supply port 2 is opened at the center of a solid-gas mixing chamber 3. Around the raw material supply port 2, a plurality of (three in this embodiment as shown in FIG. 2) raw material supply nozzles 4 are arranged. The raw material supply nozzle 4 is communicated with a high-pressure header 5 located above the raw material supply nozzle 4, and the high-pressure compressed air supplied to the high-pressure header 5 is ejected from the raw material supply nozzle 4 as a high-speed air stream. There is.

An expansion pipe 6 extends from the lower end of the solid-gas mixing chamber 3, and the expansion pipe 6 accelerates the solid-gas mixing airflow generated in the solid-gas mixing chamber 3. The expansion tube 6 is opened in the rotary crushing chamber 7, and its discharge tip 6a faces a collision plate 8 constituting the bottom plate of the swirling crushing chamber 7 at a predetermined interval.

A plurality of swirling and crushing nozzles 10 are equidistantly arranged at an angle θ with respect to the center O of the chamber as shown in FIG. The swirling and pulverizing nozzle 10 is communicated with a high-pressure header 11 located on the outer peripheral side thereof, and the high-pressure compressed air supplied to the high-pressure header 11 is ejected from the swirling and pulverizing nozzle 10 as a high-speed air stream. ing.

A discharge casing 12 that connects the high-pressure header 5 and the swirl crushing chamber 7 is provided on the outer peripheral side of the expansion tube 6, and a discharge port 12 a is opened in the discharge casing 12. There is.

Next, the operation of the fine crusher configured as described above will be described. When compressed air is ejected from a compressed air source (not shown) through the high-pressure header 5 and the high-pressure header 11 from the raw material supply nozzle 4 and the swirling pulverization nozzle 10, the fine particles for pulverization (raw material) are fed to the raw material supply hopper 1. It is supplied to the solid-gas mixing chamber 3 from the raw material supply port 2 via. The raw material is mixed with the air jetted from the raw material supply nozzle 4 in the solid-gas mixing chamber 3 to form a solid-gas mixed air stream, which is introduced into the expansion pipe 6, and further accelerated by the expansion pipe 6, and then collides with the collision plate 8. To do. As a result, the fine particles are further crushed (volume crushed) or cracked, scattered in a radial direction parallel to the collision plate 8 and jump into the swirling crush chamber 7. In the swirling and crushing chamber 7, swirling and crushing nozzles 10 are arranged at equal intervals on the outer peripheral wall, and high-speed jet air is jetted from these nozzles. It is swirled at high speed by jet air, and during this period, the crushed powder collides with and rubs against it to further crush (area crush). That is, in the swirling and crushing chamber 7, centrifugal force acts on the powder due to high-speed swirling, and large particles are swirled on the outer wall side, and further crushed by the swirling and crushing nozzle 10 to become finer.

The finely divided fine powder moves while swirling to the center of the swirling and crushing chamber 7 by the cyclone effect, rises around the expansion tube 6, and is discharged from the discharge casing 12 on the outer peripheral side through the discharge outlet 12a. To be done.

In the embodiment, the number of the raw material supply nozzles 4 is three, but it may be two or more. In this case, if the number of supply nozzles is extremely increased, it approaches the annular nozzle. Further, in the present embodiment, the fine pulverizer has been described as a vertical type (or vertical type) in which ejection is performed in the vertical direction, but the ejection direction may be a horizontal type in which the ejection direction is horizontal.

[0016]

[Effect of device]

 As described above, according to the present invention, the following effects can be obtained. (1) Since the raw material supply nozzle that ejects the high-speed air flow is provided around the raw material supply port, adhesion does not grow in the solid-gas mixing chamber, so the raw material can be supplied stably and the product has a uniform particle size. . (2) When a plurality of nozzles are provided around the raw material supply port, the contact area between the solid and the high-speed airflow is wider and the dispersion is larger than when one raw material supply nozzle is installed in the center as in the conventional case. The property is improved. (3) In the raw material supply section, the air currents jetted from the plural raw material supply nozzles collide with the raw material, so that the dispersion and pulverization of the particles are promoted also in this portion.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a fine pulverizer according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 1 Raw Material Supply Hopper 2 Raw Material Supply Port 3 Solid Gas Mixing Chamber 4 Raw Material Supply Nozzle 5, 11 High Pressure Header 6 Expansion Tube 7 Swirling Grinding Chamber 8 Collision Plate 10 Swirling Grinding Nozzle 12 Discharge Casing

Claims (1)

[Scope of utility model registration request] 1. A raw material supplied from a raw material supply port is mixed with a high-speed air stream ejected from a raw material supply nozzle in a solid-gas mixing chamber and then collided with a collision body to pulverize particles in the air stream. A fine pulverizer further swirling and pulverizing by a high-speed airflow by a swirling pulverizing nozzle provided on the circumference of the periphery of the above, wherein a plurality of the raw material supply nozzles are provided around the raw material supply port.