JPH077744U - Pulverizer - Google Patents

Abstract

(57) [Summary] [Purpose] A fine crusher capable of preventing the adhesion of raw materials (powder or granules) generated around the raw material supply nozzle, stably supplying the raw material, and continuously producing a certain fine powder. I will provide a. [Structure] A nozzle 4 for ejecting a high-speed air stream, a suction port 5a for guiding a powder or granular material from the outside, and a nozzle 1 for ejecting from the nozzle
In an injector type fine pulverizer provided with a solid gas mixing chamber 3 for mixing the secondary gas, the secondary gas introduced from the suction port 5a, and the granular material, and an accelerating unit 6 connected to the solid gas mixing chamber 3, At least one secondary gas inlet 8 is provided in the solid-gas mixing chamber 3 at a position separated from the suction port 5a.

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 clogging due to adhesion of powder and granules in a solid-gas mixing part of a raw material supply part of powder and granules Regarding a fine crusher.

[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. This pulverizer employs a method called an injector method in which the raw material is supplied near the tip of a nozzle that ejects a high-speed air stream, and the surrounding air is drawn in by the negative pressure generated by the ejection of the high-speed air stream and the raw material is taken into the high-speed air stream. ing. FIG. 5 is a diagram showing the details of the injector part 1 in the conventional fine pulverizer. A solid-gas mixing chamber 3 is formed in the injector body 2, and a nozzle 4 is provided in the solid-gas mixing chamber 3. Is facing. Further, the lower end of the raw material supply hopper 5 fixed to the injector main body 2 is opened to the solid-gas mixing chamber 3, and this opening portion constitutes the suction port 5a. Further, the solid-gas mixing chamber 3 is communicated with the powder-particle accelerating unit 6.

[0003]

[Problems to be solved by the device]

 According to the conventional fine pulverizer shown in FIG. 5, in the injector part, the main flow part from the suction port 5a to the high-speed air flow has a high moving speed among the powdery particles drawn into the high-speed air flow near the tip of the nozzle. However, in the vicinity of the wall surface of the solid-gas mixing chamber, there are some parts where the movement speed is extremely slow and some parts are facing in the opposite direction due to the resistance of the wall surface, etc. When the raw material is fine powder, adhesion to the wall surface occurs. Cheap. Then, the fine powder adhered to the wall surface gradually grows as shown in FIG. Due to the growth of such deposits, the passage of fine powder is narrowed, the amount of raw material supply decreases with the passage of time, and eventually there is a problem that supply becomes impossible.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the adherence of raw materials (powder or granules) generated around the raw material supply nozzle and to stably supply the raw material, An object of the present invention is to provide a fine crusher capable of continuously producing a certain amount of fine powder.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the fine pulverizer of the present invention has a nozzle for ejecting a high-speed air stream, a suction port for guiding powder particles from the outside, and a primary gas and a suction port for ejecting from the nozzle. In an injector type fine pulverizer equipped with a solid-gas mixing chamber for mixing the secondary gas and the granular material, and an accelerating section connected to the solid-gas mixing chamber, the solid-air mixing chamber is separated from the suction port. It is characterized in that at least one secondary gas inlet is provided at the position.

[0006]

[Action]

 According to the present invention having the above-described configuration, the main stream of the secondary air flows in from the raw material supply port and carries the raw material near the tip of the supply nozzle, but the secondary air flows through the secondary gas inlet port on the wall surface around the nozzle. Since there is a flow of air introduced from the outside, the adhesion of fine powder is unlikely to occur. Further, even if the raw material adheres to a part of the wall surface, if the adhered material gradually grows, it will be affected by the air flow introduced from the secondary gas inlet, and will contact with this air flow. Part of the deposit peels off and falls off, preventing growth above a certain level. In this way, the required size of the raw material supply passage is always secured, and a stable supply of raw material is possible.

[0007] Although the small holes provided around the nozzle are normally open to the atmosphere and the negative pressure of the injector can be used for the natural inflow system, high pressure gas is introduced into the small holes, and the pressure of this gas It is also possible to use a method in which the adhered matter is positively blown off by the air flow.

[0008]

【Example】

 Hereinafter, an embodiment of a fine pulverizer according to the present invention will be described with reference to FIGS. 1 to 3, elements having the same functions and actions as those in FIG. 5 will be described with the same reference numerals.

FIG. 1 is a vertical cross-sectional view showing the overall structure of a fine pulverizer. The fine pulverizer pulverizes by giving a swirling motion to an injector section 1 for drawing and mixing raw materials into a high-speed air stream. The rotary crushing unit 10 and the discharging unit 15 for discharging the crushed fine powder are included.

As shown in FIG. 2, the injector part 1 includes an injector body 2, and a solid-gas mixing chamber 3 is formed in the injector body 2. A nozzle 4 communicating with a compressed air source faces the inside of the solid-gas mixing chamber 3. Further, the lower end of the raw material supply hopper 5 fixed to the injector main body 2 is opened to the solid-air mixing chamber 3, and this opening constitutes the suction port 5a. Further, the solid-gas mixing chamber 3 communicates with the granular material accelerating unit 6.

Further, the injector main body 2 is formed with a plurality of secondary gas inlets 8 communicating with the solid-gas mixing chamber 3 at positions separated from the suction port 5a. Each secondary gas inlet 8 is directed toward the central portion O of the injector body 2 as shown in FIG. A supply pipe 9 for supplying compressed air is connected to the nozzle 4.

A downstream end of the injector part 1 is connected to a swirling and crushing part 10, and the swirling and crushing part 10 includes a swirling and crushing chamber 11. A plurality of swirling and grinding nozzles 12 are arranged at equal intervals on the outer periphery of the swirling and grinding chamber 11. The swirling crushing nozzle 12 is communicated with a high-pressure header 13 on the outer peripheral side thereof, and the high-pressure compressed air supplied to the high-pressure header 13 is ejected from the swirling crushing nozzle 12 as a high-speed air stream. ing . Further, a discharge unit 15 for discharging the fine powder crushed from the central portion of the swirling crushing chamber 11 is extended upward.

Next, the operation of the fine crusher configured as described above will be described. When compressed air is ejected from the compressed air source (not shown) through the supply pipe 9 and the high-pressure header 13 from the nozzle 4 and the swirl pulverizing nozzle 12, the fine particles for pulverization (raw material) are fed to the raw material supply hopper 5. It is supplied to the solid-gas mixing chamber 3 through the suction port 5a. At this time, the secondary gas is drawn from the suction port 5a by the primary gas composed of the high-speed airflow ejected from the nozzle 4. At this time, the secondary gas is also introduced from the secondary gas inlet 8 due to the negative pressure in the solid-gas mixing chamber 3. This secondary gas flow prevents the adhesion of fine particles on the wall surface around the nozzle.

The raw material is mixed with the above-mentioned primary gas and secondary gas in the solid-gas mixing chamber 3 to form a solid-gas mixed air stream, which is introduced into the accelerating section 6, which is further accelerated by the accelerating section 6 and then pulverized by turning. Jump into chamber 11. In the swirling and crushing chamber 11, swirling and crushing nozzles 12 are arranged at equal intervals on the outer peripheral wall, and since high-speed jet air is jetted from these nozzles, the granular material is swirled at high speed by the high-speed jet air, and during this time, Particles collide with each other and rub against each other to be pulverized (area pulverization). That is, in the swirling and pulverizing chamber 11, a centrifugal force acts on the powder due to high-speed swirling, and large particles are swirled on the outer wall side, and further pulverized by the swirling and pulverizing nozzle 12 to be further miniaturized.

The finely-divided fine powder moves to the center of the swirling and crushing chamber 11 while being swirled by the cyclone effect, rises in the discharge unit 15, and is discharged from the discharge port 15a.

FIG. 4 is a diagram showing an example in which the secondary gas inlet 8 is inclined with respect to the center O of the solid-gas mixing chamber 3. That is, since the secondary gas inlet 8 is inclined at an angle θ with respect to the center O of the solid-gas mixing chamber 3, the secondary gas flowing from the gas inlet 8 flows along the wall surface, around the nozzle, and the solid gas. The adhesion of fine powder to the wall surface of the mixing chamber 3 is further prevented.

[0017]

[Effect of device]

 As described above, according to the present invention, since the solid gas mixing chamber is provided with the secondary gas inflow port different from the suction port for powder particles, the powder particles adhere to the wall surface of the peripheral portion of the raw material supply nozzle. Can be prevented, stable supply of raw materials is possible, and the product has a constant particle size.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing details of an injector portion of the fine pulverizer shown in FIG.

FIG. 3 is a vertical cross-sectional view of FIG.

FIG. 4 is a vertical cross-sectional view showing another embodiment of the injector unit in the fine pulverizer according to the present invention.

FIG. 5 is a cross-sectional view of an injector portion in a conventional fine pulverizer.

FIG. 6 is an explanatory view showing a state of adhesion of powder particles in the injector portion shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 injector part 2 injector main body 3 solid-gas mixing chamber 4 nozzle 5 raw material supply hopper 5a suction port 6 powder particle accelerating part 8 secondary gas inlet 10 swirling crushing part 11 swirling crushing chamber 12 swirling crushing nozzle 15 discharge part

Claims (1)

[Scope of utility model registration request] 1. A nozzle for ejecting a high-speed air stream, a suction port for guiding the powder and granules from the outside, a primary gas spouted from the nozzle, a secondary gas introduced from the suction port, and a solid mixture for mixing the powder and granules. In an injector type fine pulverizer including a gas mixing chamber and an accelerating section connected to the solid gas mixing chamber, at least one 2 is provided in the solid gas mixing chamber at a position separated from the suction port.
A fine pulverizer having a secondary gas inlet.