JP3440526B2 - Classifier - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a classifier for classifying solid particles, and more particularly to a measure for improving classifying efficiency.

[0002]

2. Description of the Related Art Conventionally, there is a classifying device of this type disclosed in Japanese Patent Application Laid-Open No. 5-115848. As shown in FIG. 10, a supersonic flow generating means is provided in a classifying chamber (a1). (B1) is connected in series, and the particle collecting means (c1) is housed in the classification chamber (a1).

The supersonic flow generating means (b1) jets a solid gas mixture gas G of fine solid particles and carrier gas from the outlet (b2) to the classification chamber (a1) while supersonic flow is generated. The particle collecting means (c1) is a partition wall (c2, which is a pair of parallel flat plates).
c2), and between the partition walls (c2, c2) is formed in the coarse particle recovery passageway (a2), and both outer sides of the partition walls (c2, c2) are formed in the fine particle recovery passageways (a3, a3).

From the supersonic flow generating means (b1), the solid gas mixture gas G flows into the classification chamber (a1) in a supersonic flow toward the coarse particle recovery passageway (a2). At that time, since one end of the coarse particle recovery passage (a2) (not shown, the lower end of FIG. 10) is closed, the solid-gas mixture gas G flowing toward the inlet (a4) at the other end is closed. The coarse particle recovery passageway (a2) becomes an obstacle. As a result, the standing shock wave S is generated in the supersonic flow field of the solid-gas mixture gas G in the vicinity of the inflow port (a4) of the coarse particle recovery passageway (a2).

Before and after the wavefront of the standing shock wave S, the flow velocity and the flow direction of the solid-gas mixture gas G suddenly change (see FIG. 10F1). The fine particles Pf among the solid particles in the solid gas mixture gas G are the solid gas mixture gas G.
Flow into the fine particle recovery passageway (a3) (see FIG. 10F2), the coarse particles Pr continue to go straight (see FIG. 10F3), and flow into the coarse particle recovery passageway (a2) where the solid particles become coarse. The particles will be classified into particles Pr and fine particles Pf.

[0006]

In the above-mentioned classification device, conventionally, the inlet end, which is the upper end of the partition wall (c2, c2), is simply constituted by the cut surface of the partition wall (c2, c2), The area that impedes the flow of the sonic-flow solid-gas mixture gas G is
The thickness was 2, c2) only.

As a result, the flow of the solid-gas mixture gas G is
As shown in FIG. 10F4, the coarse particle recovery passageway (a2) is curved at the inlet (a4) and a backflow occurs, and the fine particles Pf and the like hit the vicinity of the inlet ends of the partition walls (c2, c2) and adhere. (Refer to Fig. 10F5), coarse particles Pr and fine particles due to the accumulation of particles (c3)
There was a problem that Pf was not collected and the classification efficiency was low.

Further, the area that obstructs the flow of the solid gas mixture gas G of the supersonic flow is small only by the thickness of the partition walls (c2, c2), the standing shock wave S becomes an arc shape, and the flow direction changes. Is insufficient, the coarse particles Pr flow along with the carrier gas,
There was a problem that the collection efficiency of, that is, the classification efficiency was low.

Further, since the supersonic flow generating means (b1) jets the solid-gas mixture gas G into the classification chamber (a1), the fine particles Pf flowing in the center of the flow are either left or right. However, there was a problem that the particles did not change and flowed to the coarse particle recovery passageway (a2) (see Fig. 10F6), and the particles were not classified.

The present invention has been made in view of the above point, and prevents the particles from adhering to the inlet end of the partition wall, and improves the classification efficiency by causing the carrier gas to change its direction sufficiently. On the other hand, another object of the present invention is to improve the classification efficiency by preventing particles from flowing through the central portion of the flow of the solid-gas mixture gas.

[0011]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the means taken by the invention of 1 increases the obstacle area which obstructs the flow of the solid-gas mixture gas in the partition wall, while the invention of another invention is devised. The means is to reduce the particle density in the central portion of the solid-gas mixture gas flow.

Specifically, as shown in FIG. 1, in the means taken by the invention according to claim 1, first, a solid-gas mixture gas G in which solid particles are mixed in a carrier gas is discharged at a supersonic flow rate. (35)
A supersonic flow generating means (3) for further ejecting is provided. And the outlet (35) of the supersonic flow generating means (3)
Is provided with a classification chamber (2) into which the solid-gas mixture gas G flows in supersonic flow. Further, a coarse particle recovery passageway (21) and a fine particle recovery passageway (22) are defined in the inside of the classification chamber (2), and the inflow port (23) of the coarse particle recovery passageway (21) is a supersonic flow. The partition walls (41, 41) are provided so as to face the outlet (35) of the generating means (3) at a predetermined interval, and the coarse particle recovery passage inside the classification chamber (2) is provided.
The solid particles in the solid-gas mixture gas G are separated into coarse particles Pr so as to generate a standing shock wave S in the supersonic flow field of the solid-gas mixture gas G in the vicinity of the inlet (23) of the passage (21). Particle recovery means (4) for classifying into particles Pf is provided.

In addition, at the inlet end of the partition wall (41, 41) of the particle collecting means (4), the supersonic flow generating means (3) is projected toward the center of the coarse particle collecting passageway (21). The surface facing the outflow port (35) is formed with a flange (42) having a flat surface (43).

Further, the means taken by the invention according to claim 2 is that in the invention according to claim 1, the inner surface (44) of the collar part (42) extends from the tip of the collar part (42) to the partition wall (41, The inner surface of 41) is formed so as to continue smoothly.

Further, the means taken by the invention according to claim 3 is that in the invention according to claim 1 or 2, the inlet (23) between the tips of the collar part (42) has a supersonic flow generating means (3). ) Is larger than the outlet (35).

Further, the means taken by the invention according to claim 4 is that in the invention according to any one of claims 1 to 3, the supersonic flow generating means (3) is concentric with the outlet (35). The auxiliary gas is arranged so as to have an auxiliary introduction path (3a) for introducing the auxiliary gas into the solid-gas mixture gas G toward the center of the outflow port (35).

Further, the means of implementing the invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the partition walls (41, 41) are composed of a pair of flat plates arranged in parallel. Has been done.

[0018]

With the above-mentioned structure, in the inventions according to claims 1 and 5, first, the supersonic flow generating means (3) produces a solid-gas mixture gas G in which solid particles such as ultrafine particles are mixed in a carrier gas such as air. While supplying to the classification chamber (2), the inside of the classification chamber (2) is set to a low pressure, so that the carrier gas of the solid gas mixture gas G is accelerated to supersonic velocity and jetted into the classification chamber (2). Then, the solid particles also become supersonic with the carrier gas and are jetted into the classification chamber (2).

Thereafter, the above-mentioned supersonic flow solid gas mixture gas G
Will flow from the outlet (35) of the supersonic flow generator (3) to the inlet (23) of the coarse particle recovery passageway (21) in the classification chamber (2). At that time, the coarse particle recovery passageway (21) and the flat surface (43) of the collar portion (42) become an obstacle to the flow of the solid-gas mixture gas G, and a standing shock wave S is generated in the vicinity of the inlet (23). Will be done.

A solid gas mixture gas G is generated by the standing shock wave S.
The flow of the carrier gas rapidly swirls and the fine particles Pf
Has a small inertial force, its flow direction changes following the carrier gas and flows into the fine particle recovery passageway (22) outside the partition walls (41, 41). On the other hand, among the solid particles, the coarse particles Pr have a large inertial force, and therefore, the coarse particles Pr go straight regardless of the change in the direction of the carrier gas, and enter the inlet ( 23) Inflow from coarse particles Pr and fine particles Pf
And will be classified.

In the invention according to claim 3, since the inlet (23) of the coarse particle recovery passageway (21) is set larger than the outlet (35) of the supersonic flow generating means (3),
The coarse particles Pr flow into the coarse particle recovery passageway (21) without colliding with the tip of the collar portion (42) or the like.

Further, in the invention according to claim 2, since the inner surface (44) of the collar portion (42) is smoothly continuous to the partition walls (41, 41), the velocity of the coarse particles Pr is decelerated to cause a flow. It becomes smooth, and the coarse particles Pr do not adhere to the partition walls (41, 41).

In the invention according to claim 4, the auxiliary gas is supplied from the auxiliary introduction passage (3a) to the center of the outlet (35) of the supersonic flow generating means (3), and the solid gas mixture gas G That is, the density of solid particles in the upper center portion of the inflow port (23) decreases. As a result, the fine particles Pf flowing through the central portion of the inflow port (23) are reduced, and the fine particles Pf flow into the fine particle recovery passageway (22) without being recovered in the coarse particle recovery passageway (21). Become.

[0024]

Therefore, according to the invention of claim 1,
Since the flange portion (42) is formed at the inlet end of the partition walls (41, 41) to provide the flat surface (43), the area that obstructs the flow of the carrier gas is large and the standing shock wave S Can be almost flat. With this flat standing shock wave S,
Since the carrier gas can be swirled at a substantially right angle, it is possible to reliably prevent the solid-gas mixture gas G from flowing backward at the inlet (23) of the coarse particle recovery passageway (21).

As a result, the fine particles Pf are smoothly redirected at a substantially right angle and collected in the fine particle collecting passage (22), so that they are prevented from adhering to the partition walls (41, 41). .

Further, since the carrier gas surely makes a sharp turn, the coarse particles Pr do not follow the carrier gas and reliably flow into the coarse particle recovery passageway (21).
The Pr collection efficiency, that is, the classification efficiency is improved.

Further, according to the second aspect of the invention, since the coarse particle recovery passageway (21) is set to be larger than the inflow port (23) by the flange portion (42), the inflow port (21) 23) Although the flow velocity of the solid-gas mixture gas G flowing in is small, the flow velocity of the solid-gas mixture gas G is reduced and the flow of the solid-gas mixture gas G in the coarse particle collecting passage (21), that is, the coarse particles Pr. The flow becomes smooth, the adhesion to the partition walls (41, 41) is prevented, and the classification efficiency can be improved.

Further, according to the invention of claim 3, the inlet (23) of the coarse particle recovery passageway (21) is set to be larger than the outlet (35) of the supersonic flow generating means (3). Moreover, since it is possible to reliably prevent the coarse particles Pr from colliding with the tip of the collar portion (42), it is possible to improve the classification efficiency.

Further, according to the invention of claim 4, auxiliary introduction for introducing auxiliary gas into the solid-gas mixture gas G is located concentrically with the outlet (35) of the supersonic flow generating means (3). Since the passage (3a) is provided, the supply of the auxiliary gas reduces the fine particles Pf flowing through the center of the inflow port (23) in the coarse particle recovery passageway (21). It is possible to prevent the coarse particles from being recovered in the coarse particle recovery passageway (21) and improve the classification efficiency.

Further, according to the invention of claim 5, the partition wall (41, 41) is composed of two parallel flat plates, so that the collar portion (42) is larger than the cylindrical wall. The area of the flat surface (43) is increased, and the flat portion of the standing shock wave S can be efficiently formed.

[0031]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIG. 1, (1) is a classifying device, which is used for forming a thin film of fine particles, measuring the particle size, etc., and is connected to a fine particle manufacturing device (not shown). .

In the classification device (1), a supersonic flow generating means (3) is connected to the classification chamber (2) and the classification chamber (2) is also connected.
The particle collecting means (4) is housed in the inside.

The supersonic flow generating means (3) is connected to a fine particle production apparatus (not shown), and is 1 μm or less of metal, ceramic or the like produced by the fine particle production apparatus by a vapor phase method, a liquid phase method, a pulverization method or the like. Solid particles that are ultra-fine particles of air, He,
A solid gas mixture gas G mixed with an inert gas carrier gas such as Ar is jetted into the classification chamber (2) in a supersonic flow.

The supersonic flow generating means (3) is provided with a Laval tube (31), and the Laval tube (31) has an introducing portion (32) which is tapered downward and the introducing portion. The throat part (33) is continuously formed at the lower end of the (32), and the lead-out part (34) is continuously formed at the lower end of the throat part (33) and spreads downward. The lower end surface of the lead-out portion (34) serves as an outlet (35) for the solid gas mixture gas G.

As shown in FIG. 2, the classification chamber (2) is
The Laval tube (31) is formed in a rectangular box.
2 extends in the vertical direction in FIG. 2 and the outlet (35)
Is formed in a rectangular shape extending in the vertical direction at the center of the upper surface of the classification chamber (2).

The particle collecting means (4) is provided with two partition walls (41, 41), and the partition walls (41, 41) are arranged in parallel at a predetermined interval. In, the upper and lower surfaces of the classification chamber (2) are provided.

Between the two partition walls (41, 41),
Coarse particle recovery passageway (21) located in the center of the classification chamber (2)
The outer sides of the partition walls (41, 41) are formed in the fine particle recovery passageway (22) at both sides of the classification chamber (2). The lower end of the coarse particle recovery passageway (21) is connected to a thin film forming device or the like to be closed, while the lower end of the fine particle recovery passageway (22) is connected to a vacuum pump (not shown), The inside of the classification chamber (2) is evacuated by the vacuum pump.

Further, the space between the upper ends of the partition walls (41, 41) is formed at the inlet (23) of the coarse particle recovery passageway (21).
The partition walls (41, 41) are arranged so that the inflow port (23) faces the outflow port (35) of the supersonic flow generating means (3) at a predetermined interval. In addition, the partition wall (41,
41) and the coarse particle recovery passageway (21) are arranged so as to obstruct the supersonic solid-gas mixture gas G flowing into the classification chamber (2) from the Laval tube (31), and the inlet (23) ), The standing shock wave S is generated in the supersonic flow field near the upper part. Due to the standing shock wave S, the carrier gas of the solid-gas mixture gas G changes its flow direction to classify the solid particles in the solid-gas mixture gas G into coarse particles Pr and fine particles Pf.

As a feature of the present invention, a collar portion (42) is formed on each of the partition walls (41, 41) at an upper end which is an inlet end. The collar portion (42) projects inward, which is the center side of the coarse particle recovery passageway (21). A flat surface (43) is formed on the upper surface of the collar portion (42) and faces the outlet (35) of the Laval tube (31). That is, the flat surface (43) of the collar portion (42) is formed so as to have an area sufficient to obstruct the flow of the solid gas mixture gas G of the supersonic flow.

The inner surface (44) of the collar portion (42) is formed so as to smoothly continue from the tip of the collar portion (42) to the inner surface of the partition walls (41, 41). ) Of the partition wall (41, 41) from the tip to the inside of the partition wall (41, 41).

Therefore, specific dimensions of the coarse particle recovery passageway (21) and the like will be described with reference to FIG.

First, the outlet (35) of the Laval pipe (31).
The width Dn of the rough particle recovery passage (21) is determined by the amount of treatment to be classified.
If the width Dc of this inlet (23) is smaller than the width Dn of the outlet (35), the coarse particles Pr will be larger than the width Dn of (5) (Dc ≧ Dn). Will collide with.

The width Di of the coarse particle recovery passageway (21) is
Is set larger than the width Dc of the inlet (23) (Di
> Dc), since the coarse particle recovery passageway (21) is larger than the inflow port (23), the flow velocity of the solid-gas mixture gas G that has flowed in through the inflow port (23) is smaller, that is, further reduced. I try to make the flow smooth.

Further, the outer width Do on the outside of both the partition walls (41, 41) is preferably twice or more the width Dc of the inlet (23) (Do ≧ 2Dc), and the classification chamber (2). The width Dr is set to, for example, three times or more the external width Do of the partition walls (41, 41) so that the end of the standing shock wave S does not interfere (Dr ≧ 3D
o) Further, the interval L between the outlet (35) and the inlet (23) is set to, for example, 0.5 Dn or more and 5 Dn or less with respect to the width Dn of the outlet (35) ( 0.5Dn ≦ L ≦ 5D
n).

Next, the classification operation in the classification device (1) will be described.

First, the Laval tube (31) of the supersonic flow generating means (3) is supplied with the solid-gas mixture gas G prepared by mixing the solid particles of ultrafine particles produced in the fine particle production apparatus with the carrier gas such as air.
While supplying to the coarse particle recovery passageway (21) of the classification chamber (2)
The inside of the classification chamber (2) is evacuated by a vacuum pump via the. Due to this evacuation, a predetermined pressure difference is generated between the inlet side and the outlet side of the supersonic flow generating means (3), that is, between the fine particle manufacturing apparatus side and the inside of the classification chamber (2), and the solid-gas mixture gas G is generated. Flows through the Laval tube (31) and is throttled by the throat section (33) of the Laval tube (31), so that it becomes a supersonic flow in the derivation section (34) and from the outlet (35) to the classification chamber (2). It will gush out. That is, since the carrier gas of the solid gas mixture gas G is accelerated to supersonic velocity, the solid particles are also supersonic velocity accompanying the carrier gas and are jetted into the classification chamber (2).

After that, the above-mentioned supersonic flow solid-gas mixture gas G
Will flow from the outlet (35) toward the inlet (23) of the coarse particle recovery passageway (21) in the classification chamber (2). At this time, since the lower end of the coarse particle recovery passageway (21) is closed, the coarse particle recovery passageway (21) and the collar portion (42) are closed.
The flat surface (43) becomes an obstacle to the flow of the solid-gas mixture gas G, and a standing shock wave S is generated near the upper part of the inlet (23). The standing shock wave S is shown in FIGS. 1 and 4. As described above, since the flat surface (43) is formed on the collar portion (42), it is almost flat.

A solid gas mixture gas G is generated by the standing shock wave S.
As shown in FIG. 4, the carrier gas flow Fg of the carrier gas suddenly swirls and the flow direction changes to a substantially right angle, and the fine particles Pf of the solid particles in the solid-gas mixture gas G have an inertial force. Since it is small, the flow direction Ff surely changes following the change in the direction of the carrier gas, and flows into the fine particle recovery passageway (22) outside the partition walls (41, 41) to be recovered.

On the other hand, among the solid particles in the solid-gas mixture gas G, the coarse particles Pr have a large inertial force, so that they become a straight flow Fr regardless of the change in the direction of the carrier gas, and the partition wall (4
Inlet (23) to the coarse particle recovery passageway (21) inside (1, 41)
Since the cross-sectional area of the coarse particle recovery passageway (21) is further increased, the coarse particles Pr are decelerated and smoothly flow to be recovered.

As a result, the solid particles of the solid-gas mixture gas G are classified into fine particles Pf and coarse particles Pr.

Therefore, according to this embodiment, since the flange portion (42) at the inlet end of the partition wall (41, 41) is formed to provide the flat surface (43), the carrier gas Has a large area that obstructs the flow of the stationary shock wave S, and the standing shock wave S can be made substantially flat. The flat standing shock wave S allows the carrier gas to swirl at a substantially right angle, so that the solid-gas mixture gas G can be reliably back-flowed at the inlet (23) of the coarse particle recovery passageway (21). Can be prevented.

As a result, the fine particles Pf are smoothly turned around at a right angle and collected in the fine particle collecting passageway (22), so that they are prevented from adhering to the partition walls (41, 41). .

Further, since the carrier gas surely swirls suddenly, the coarse particles Pr do not follow the carrier gas and reliably flow into the coarse particle recovery passageway (21).
The Pr collection efficiency, that is, the classification efficiency is improved.

Further, the collar portion (42) allows the inlet (2
The width Di of the coarse particle recovery passageway (21) is set to be larger than the width Dc of 3), and the flow velocity of the solid gas mixture gas G flowing from the inlet port (23) is small. Mixed gas G
Of the solid-gas mixture gas G in the coarse particle recovery passageway (21), that is, the flow of the coarse particles Pr is smoothed, adhesion to the partition walls (41, 41) is prevented, and classification is performed. It is possible to improve efficiency.

Further, since the inlet (23) of the coarse particle recovery passageway (21) is set to be larger than the outlet (35) of the supersonic flow generating means (3), the coarse particles Pr are Since it is possible to reliably prevent the collision with the tip of the collar portion (42), it is possible to improve the classification efficiency.

Since the partition walls (41, 41) are composed of two parallel flat plates, the area of the flat surface (43) of the collar portion (42) is larger than that of the cylindrical wall. Therefore, the flat portion of the standing shock wave S can be efficiently formed.

Therefore, FIG. 5 shows the classification efficiency of the present example and the conventional example, where X1 is originally used for the preset classification diameter for classifying coarse particles Pr and fine particles Pf. As shown, all coarse particles larger than the classified diameter should be recovered in the coarse particle recovery passageway (21), but conventionally, as shown in X2, fine particles Pf are recovered in the coarse particle recovery passageway (21). In addition, the coarse particles Pr adhered to the partition walls (41, 41), and the recovery of the coarse particles Pr larger than the classified diameter was low.

In FIG. 5, the classification efficiency is
Coarse particles recovered in the coarse particle recovery passageway (21) for the coarse particles R1 in the solid-gas mixture gas G supplied to the classification chamber (2)
It is the ratio of R2 [(R2 / R1) 100%].

On the other hand, in the present embodiment, as indicated by X3, the fine particles Pf follow the carrier gas, so that the amount of recovery in the coarse particle recovery passageway (21) is reduced, while the coarse particles are recovered.
Since Pr does not adhere to the partition walls (41, 41), the amount recovered in the coarse particle recovery passageway (21) increases.

6 to 8 show another embodiment of the collar portion (42). The collar portion (42) of FIG. 6 has a chamfered portion (45) formed by cutting off the outer corner portion. Has been formed. Also, FIG.
The outer corner portion of the collar portion (42) is cut into an arc shape to form a rounded portion (46). In addition, the collar (4
In 2), the inner surface (47) extends from the tip of the collar (42) to the partition wall (4
It is formed as an arc surface that is continuous with a concave arc over the inner surface of (1, 41).

FIG. 9 shows an embodiment of the invention according to claim 4, wherein the supersonic flow generating means (3) has an outlet (35).
Auxiliary introduction passage (3a) which is located concentrically with the solid gas mixture gas G and introduces only the auxiliary gas into the solid gas mixture gas G is provided.

The auxiliary introducing passage (3a) is provided inside the introducing portion (32) of the Laval tube (31), and has an upper end (not shown) of only carrier gas in which solid particles are not mixed. While the gas supply means for supplying the auxiliary gas is connected, the lower end is located near the upper end of the throat part (33) and opens, and the auxiliary introduction path (3a) mixes only the carrier gas with solid gas. The gas G is supplied to the central part.

Depending on the supply of this auxiliary gas, in the solid-gas mixture gas G flowing in the central upper part of the inlet (23) in the coarse particle recovery passageway (21), the solid in the central upper part of the inlet (23) is The density of the particles will be reduced.

As a result, the fine particles Pf flowing in the central upper portion of the inflow port (23) are reduced, and the fine particles Pf are not recovered in the coarse particle recovery passageway (21), and the fine particle recovery passageway (22) is
Will flow to. That is, the flow of the fine particles Pf shown in FIG. 4Fs is prevented.

Therefore, as shown by X4 in FIG. 5, the fine particles Pf recovered in the coarse particle recovery passageway (21) are reduced, and the classification efficiency is improved.

In this embodiment, the classification chamber (2) has a rectangular cross section and the partition walls (41, 41) are formed by a pair of parallel flat plates. In the invention, the partition walls (41, 41) may be cylindrical, and the classification chamber (2) and the Laval tube (31) may be cylindrical.

In the embodiment shown in FIG. 9, the auxiliary gas is the carrier gas, but the invention according to claim 4 is not limited to the carrier gas, and a clean gas different from the carrier gas may be used. .

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a classification device of the present invention.

FIG. 2 is a plan sectional view of FIG. 1A-A.

FIG. 3 is a schematic vertical sectional view of a classification device showing dimensions of an inlet and the like.

FIG. 4 is a vertical cross-sectional view of a classification device showing a flow of a solid gas mixture gas.

FIG. 5 is a characteristic diagram of classification efficiency.

FIG. 6 is a cross-sectional view showing another collar portion.

FIG. 7 is a cross-sectional view showing another collar portion.

FIG. 8 is a cross-sectional view showing another collar portion.

FIG. 9 is a vertical cross-sectional view of a classification device including an auxiliary introduction path.

FIG. 10 is a vertical cross-sectional view showing a conventional classification device.

[Explanation of symbols]

1 classifier 2 classification room 21 Coarse particle recovery passage 22 Fine particle recovery passage 23 Inlet 3 Supersonic flow generation means 3a Auxiliary introduction route 35 outlet 4 Particle recovery means 41 division wall 42 Tsuba 43 flat surface 44,47 inside G Solid gas mixture Pr coarse particles Pf fine particles S standing shock wave

Claims (5)

(57) [Claims] 1. A supersonic flow generating means (3) for ejecting a solid gas mixture gas G in which solid particles are mixed in a carrier gas from a flow outlet (35) in a supersonic flow, and the supersonic flow generating means ( A classification chamber (2) into which the solid-gas mixture gas G continuously flows into the outlet (35) of 3) in a supersonic flow, and a coarse particle recovery passageway (21) and fine particles are provided inside the classification chamber (2). The recovery passageway (22) is partitioned and the inlet (23) of the coarse particle recovery passageway (21) faces the outlet (35) of the supersonic flow generating means (3) at a predetermined interval. The partition walls (41, 41) are provided so that the classification chamber (2)
Near the inlet (23) of the coarse particle recovery passageway (21) inside
Particle recovery means for classifying the solid particles in the solid-gas mixture gas G into coarse particles Pr and fine particles Pf by generating a standing shock wave S in the supersonic flow field of the solid-gas mixture gas G nearby. ) And the supersonic flow which projects toward the center of the coarse particle recovery passageway (21) at the inlet end of the partition wall (41, 41) of the particle recovery means (4). A classifying device characterized in that a flange (42) is formed in which a surface of the generating means (3) facing the outlet (35) is a flat surface (43). 2. The classifying apparatus according to claim 1, wherein the inner surface (44) of the collar portion (42) is smoothly continuous from the tip of the collar portion (42) to the inner surface of the partition wall (41, 41). A classification device characterized by being formed. 3. The classifying apparatus according to claim 1, wherein the inlet (23) between the tips of the collar (42) is formed larger than the outlet (35) of the supersonic flow generating means (3). Classifying device characterized by being. 4. The classifying device according to claim 1, wherein the supersonic flow generating means (3) is located concentrically with the outlet (35) and the auxiliary gas is delivered through the outlet (35). A classification device, characterized in that it is provided with an auxiliary introduction path (3a) for introducing the solid-gas mixture gas G toward the center of the. 5. The classification device according to claim 1, wherein the partition walls (41, 41) are composed of a pair of flat plates arranged in parallel.