JPH04235331A - Powder dispersing apparatus - Google Patents

Abstract

PURPOSE:To provide a powder dispersing apparatus which can obtain the excellent dispersing state of the powder. CONSTITUTION:The powder supplied from a hopper 2 is conveyed at a high speed to a first compressing and dispersing member 11 with the air stream jetted from a first nozzle 8 and guided to a second power dispersing means 4. At the second powder dispersing means 4, the air stream containing the supplied powder is supplied into a second compressing and dispersing member 16 at a high speed with the air stream jetted through a second nozzle 13. The powder is made to be the completely separated state by passing the second compressing and dispersing member 16. The power dispersing apparatus 1 of the present invention is constituted in this way.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a powder dispersion device.
More specifically, the present invention relates to a powder dispersion device that can be used in, for example, a powder analysis device that analyzes the particle size of powder, and is suitable for dispersing powder so that the particles are independent of each other.

0002

[Prior Art and Problems to be Solved by the Invention] In this type of powder analysis equipment, a large amount of powder is not coagulated or agglomerated, but the powder particles are dispersed independently from each other, and the target area is the powder. It is necessary to supply the powder to the particle size measuring section of the body, but in most conventional systems, the powder contained in a hopper is received by a single-stage powder dispersion device, subjected to dispersion processing, and then supplied to the target location.

However, in the case of the above-mentioned conventional powder dispersion device, since it has a one-stage configuration, the dispersion force for the powder is not sufficient, and as a result, part of the powder solidifies and the dispersion state becomes poor. There was a problem in that it had an adverse effect on the measurement of the particle size of powder, etc.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a powder dispersion device which improves the structure of the device and can obtain a good dispersion state of powder.

[0005]

Means for Solving the Problems The present invention for solving the above problems includes a first fluid ejection nozzle that ejects a fluid, a first fluid ejection nozzle disposed in front of the first fluid ejection nozzle, and a first fluid ejection nozzle disposed in front of the first fluid ejection nozzle. a first flow path having a flow cross section that gradually contracts and then expands from the jet nozzle side, the powder is blown into the first flow path by the first fluid jet nozzle, and the powder is discharged from the first flow path. a first powder dispersion means for ejecting powder, a second fluid ejecting nozzle for ejecting fluid in a direction crossing the ejecting direction of the fluid ejected from the first fluid ejecting nozzle, and this second fluid ejecting nozzle. and a second flow path having a flow cross section that gradually shrinks and then expands from the second fluid ejection nozzle side, the powder ejected from the first flow path to the second flow path. This is a powder dispersing device characterized by comprising: a second powder dispersing means for blowing powder into a second flow path with a jet nozzle, and ejecting the powder from the second flow path.

[0006] In the present invention, the second powder dispersing means is configured to control the first powder dispersing means in a direction in which the fluid is ejected from the first fluid ejecting nozzle and in a direction in which the fluid is ejected from the first fluid ejecting nozzle. Preferably, the nozzle is arranged so that the direction in which the fluid is ejected from the nozzle is perpendicular to the direction of the fluid ejected from the nozzle.

[0007]

[Operation] In the powder dispersion device described above, powder from the powder supply source is first supplied to the first dispersion means. The supplied powder is conveyed to the first flow path in a restricted manner by the fluid ejected from the first fluid ejection nozzle. Together with the fluid, the powder is transported to a decreasing section of the flow cross section in the first flow path. As a result, in this reduced portion, the fluid conveying the powder becomes compressed. Since the cross-section of the first flow path has expanded, the powder-containing fluid that has passed through the reduced cross-section portion of the first flow path becomes dispersed and reaches the second powder dispersion means. Inflow. At this time, since the fluid enters a divergent state, individual particles become independent from each other.

The flow direction of the powder-containing fluid flowing into the second powder dispersing means at high speed is rapidly changed by the fluid jetted from the second fluid jetting nozzle. At this time, also by the first powder dispersion means, the partially aggregated powder is forced into a separated state.

The powder-containing fluid that has flowed into the second powder dispersion means at high speed is blown away at high speed toward the second flow path by the second fluid jetting nozzle.

[0010] In the second powder dispersion means, the powder is carried along with the fluid to a portion of the second flow path where the flow cross section is reduced. As a result, in this reduced portion, the fluid conveying the powder becomes compressed. Since the cross section of the second flow path is enlarged, the powder-containing fluid that has passed through the reduced cross-section portion of the second flow path is ejected in a divergent state. At this time, since the fluid enters a divergent state, individual particles become independent from each other.

[0011] In this way, since the powder is dispersed by two powder dispersing means, the dispersion state of the powder, which was incomplete with one powder dispersing means, is now completely dispersed, that is, the powder particles are completely dispersed. are in a state that is independent of each other and is not under coagulation or coagulation.

0012

EXAMPLES Examples of the present invention will be described in detail below.

The powder dispersion device 1 shown in FIG. 1 stores a required amount of powder and also receives powder from a hopper 2 as a powder supply source which discharges the powder downward from a discharge tube 2a provided at the lower end. A first dispersion means 3 that receives the powder, compresses the fluid, and then disperses it; and a first dispersion means 3 that receives the powder-containing fluid that has been dispersed by the first dispersion means 3 and redistributes the powder-containing fluid. A second dispersion means 4 for dispersing the condensed material after condensation.
are provided in a rectangular parallelepiped-shaped casing 5.

The casing 5 is provided with a horizontal hole 6 extending from the left end to near the right end in FIG. 1, and a vertical hole 7 penetrating from the upper right end to the lower right end in FIG.

The first dispersion means 3 includes a first nozzle 8 as a first fluid ejection nozzle, which is installed in the horizontal hole 6 at the left end side of the casing 5 in FIG.
a first connector 9 for connecting a first air pipe 10 to the first nozzle 8; and a nozzle end 8a of the first nozzle 8.
The first compression dispersion member 11 is disposed from the vicinity of the vertical hole 7 to the vertical hole 7.

The first compression and dispersion member 11 is a venturi tube whose diameter gradually decreases from the nozzle opening end 8a side to an approximately intermediate position, and whose diameter gradually increases from approximately the intermediate position to the end thereof on the vertical hole 7 side. It has a first through hole 12 that utilizes the principle. This first through hole 12 serves as a first flow path in the present invention.

Further, the discharge cylinder 2a of the hopper 2 faces above the nozzle opening end 8a of the first nozzle 8.

The second dispersion means 4 includes a second nozzle 13 as a second fluid ejection nozzle, which is installed in the vertical hole 7 at the upper right end of the casing 5 in FIG. A second connector 14 for connecting a second air pipe 15 to the second air pipe 13 is attached to the vertical hole 7 so as to extend from the lower side of the nozzle end 13a of the second nozzle 13 to the lower end of the casing 5. Second compression dispersion member 16
It is equipped with.

This second compression and dispersion member 16 utilizes the principle of a venturi tube, in which the diameter gradually decreases from the nozzle end 13a side to an approximately intermediate position, and the diameter increases sequentially from approximately the intermediate position to the lower end of the casing 5. A second through hole 17 is provided. This second through hole 17 serves as a second flow path in the present invention.

[0020] Below the vertical hole 7 of the casing 5, there is a
A discharge auxiliary cylinder 18 is provided with a hole 18a having an inner diameter equal to the diameter of the lower end of the second through hole 17, and the powder is sent to a target location, for example, a particle size measuring section in a powder particle size measuring device (not shown). A third connector 19 for connecting the supply pipe 20 to the auxiliary discharge cylinder 18 is arranged.

Air at a predetermined pressure is supplied from an air compressor (not shown) to the first air pipe 10 of the first dispersion means 3 described above, and similarly, the second air pipe 10 of the second dispersion means 4 is supplied with air at a predetermined pressure. 15, air at a predetermined pressure is supplied from an air compressor (not shown). That is, the directions of action of the air in the first and second dispersion means 3 and 4 are perpendicular to each other. Note that the direction of action of this air is not limited to perpendicular directions;
The first and second dispersion means 3 and 4 may be arranged at an arbitrary angle such as 80 degrees, 75 degrees, 60 degrees, etc.

Note that in FIG. 1, 21 is packing.

Next, the operation of the powder dispersing device 1 having the above-described structure will be explained with reference to FIG. 2.

When a required amount of powder is put into the hopper 2 and air at a predetermined pressure is supplied to the first air pipe 10 and the second air pipe 15 from an air compressor (not shown), the hopper 2 is heated. The powder falling downward from the discharge tube 2a first reaches the first through hole 12 of the first compression dispersion member 11 by the air jetted from the nozzle opening end 8a of the first nozzle 8, where it is connected to the Venturi tube. Based on this principle, the ejected air is once compressed while containing powder. In this compressed state, individual particles collide with each other, collide, and repel each other. Thereafter, it disperses and reaches the vicinity of the nozzle end 13a of the second nozzle 13.

[0025] Then, the nozzle end 13 of the second nozzle 13
It bends at right angles under the shearing force caused by the air ejected from a and reaches the second through hole 17 of the second compression and dispersion member 16 . Here, the powder is compressed again according to the Venturi tube principle, and after the individual separated particles stick together, it is dispersed again and passes through the hole 18a of the auxiliary discharge cylinder 18 and the supply pipe 20, and the particle size of the powder (not shown) is measured. The particles are then supplied to the particle size measuring section in the device.

As described above, according to the device 1 of this embodiment, by performing the compression dispersion process twice, it is possible to avoid agglomeration of the powder and discharge the powder toward the target location in a good dispersed state. becomes possible.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention.

[0028]

Effects of the Invention According to the present invention described in detail above, with the above-described configuration, the powder is subjected to compression and dispersion twice, thereby avoiding agglomeration of the powder and maintaining a good dispersion state. A powder dispersion device capable of discharging powder toward a target location can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an example device of the present invention.

FIG. 2 is an explanatory diagram of the operation of the embodiment device of the present invention.

[Explanation of symbols] 1 Powder dispersion device 2 Hopper 3. First distribution means 4 Second dispersion means 5 Casing 8 First nozzle 11 First compression dispersion member 13 Second nozzle 16 Second compression dispersion member

Claims (2)

[Claims] 1. A first fluid ejecting nozzle that ejects fluid, and a first fluid ejecting nozzle that is disposed in front of the first fluid ejecting nozzle and has a flow cross section that gradually contracts and then expands from the first fluid ejecting nozzle side. a first flow path;
a first powder dispersion means for blowing powder into the first flow path using a fluid ejection nozzle, and ejecting the powder from the first flow path; and ejection of fluid ejected from the first fluid ejection nozzle. A second fluid ejecting nozzle that ejects fluid in a direction intersecting the direction, and a flow cross section that is disposed in front of the second fluid ejecting nozzle and gradually shrinks and then expands from the second fluid ejecting nozzle side. a second flow path, which blows the powder jetted from the first flow path into the second flow path with the second jet nozzle, and jets the powder from the second flow path. A powder dispersion device comprising: a powder dispersion means. 2. The second powder dispersing means is configured to
The powder dispersing means is arranged such that the fluid jetting direction from the first fluid jetting nozzle and the fluid jetting direction from the second fluid jetting nozzle are perpendicular to each other. Item 1. Powder dispersion means according to item 1.