JPH11290783A - Pneumatic classifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air classifier for classifying particles even in sizes of powder material such as a toner at low cost and with high accuracy. SOLUTION: In this air classifier, adjacent to an opening to a dispersing chamber 5 of a dispersing chamber inflow pipe 6, a reduction and enlargement part 8 is formed in which after the flow passage area of the dispersing inflow pipe 6 is reduced at a prescribed reduction ratio, it is enlarged at a prescribed expansion ratio. A powdery material containing primary air current introduced into the dispersing chamber 5 through the dispersing chamber inflow pipe 6 has its flow velocity raised when its flow passage area is suddenly narrowed at a contraction area 9a by the reduction and enlargement part 8, and also particle density of the powder material is increased to raise collision probability of the particles with each other and to dissociate (disperse) aggregated particles firmly aggregated. The powdery material containing primary air current has its flow velocity suddenly reduced at an enlargement area 9b of the reduction and enlargement part 8, and also in the flow direction of the dispersing chamber inflow pipe 6, secondary collision of the particles with each other by a change in velocity due to a difference in particle size of the powdery material is encountered to promote the dispersion and to dissociate the aggregated particles, and the primary air current flows into the dispersing chamber with the aggregated particles being hardly present.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airflow classifier, and more particularly to an airflow classifier for appropriately classifying powder materials such as toner into particles having a uniform particle size.

[0002]

2. Description of the Related Art In an image forming method such as an electrophotographic method or an electrostatic photographing method, toner is used to develop an electrostatic latent image formed on an image carrier such as a photoreceptor. In order to obtain image quality, it is required that the toner particle size is uniform and fine.

[0003] As described above, a toner which is required to have a fine final product is prepared by melting and kneading predetermined materials such as a binder resin and an adhesive (a dye, a pigment, a magnetic substance, etc.) as raw materials, After solidification, it is produced by classification.

In order to classify such a powder material such as toner, an airflow classifier utilizing swirling airflow is generally used. As such an airflow classifier, for example, a dispersion separator (Dispersion Separat)
or: manufactured by Nippon Pneumatic Co., Ltd., hereinafter referred to as DS. ).

The DS includes a dispersion chamber, a main body casing, a classifying chamber, a lower casing, a hopper, and the like. A dispersion chamber for supplying a primary air flow and a powder material is provided at an upper outer peripheral portion of the cylindrical dispersion chamber. The inflow port is disposed in a state of extending in a tangential direction of the cylindrical shape. A conical center core with a high center is attached to the lower part of the dispersion chamber, and an annular supply groove is formed on the outer periphery of the center core.
At the bottom of the dispersion chamber, a conical severator core having a cylindrical flow path to the fine powder exhaust port is disposed at the center, and an annular coarse powder exhaust port is formed on the outer periphery of this separator core. ing. A blade-shaped secondary air inlet (also referred to as a louver) is provided on a lower outer peripheral portion of the classifying chamber as a flow path for the secondary air flow to flow in,
It is configured to disperse the powder material and accelerate the turning speed.

[0006] The classification principle of DS is that when a secondary air flow flowing in a classification chamber causes a powder material to semi-automatically flow in a swirling shape, coarse particles having a relatively large particle size and a relatively This is to take advantage of the fact that the centrifugal force acting on fine particles having a small particle size is different. Therefore, at least in the dispersion chamber before entering the classification chamber, the aggregated particles in the powder material,
The centrifugal force generated by the swirling airflow generated inside dissociates more than the force between the agglomerated particles, that is, is dispersed, or is dispersed by the impact of collision with the wall of the dispersion chamber, and the dispersed coarse particles and fine particles are dispersed. It is desirable that the particles are immediately sent to the classification chamber with the distance between the particles kept apart so as not to reaggregate.

However, in the powder material supplied from the inlet of the dispersion chamber to the dispersion chamber, coarse particles and fine particles are firmly agglomerated in advance, and may be caused by a swirling airflow inside the dispersion chamber or collision with the wall surface of the dispersion chamber. There are agglomerated particles that are not dispersed.

In this case, the agglomerated particles are sent from the dispersion chamber to the classifying chamber as they are, and the agglomerated particles, to which the fine particles are attached, are classified as coarse particles. In the step after this classification step, in the event that the aggregated particles are dissociated and separated into coarse particles and fine particles, the particle size distribution changes, the classification accuracy is reduced, and in the electrophotographic image forming method, Means that the image quality is significantly reduced.

Therefore, the present applicant first introduced a mixed fluid of a powder material and a primary air flow into a dispersion chamber, and then introduced a classification chamber configured to allow a secondary air flow to flow in from a peripheral portion. In a gas stream classifier that separates the powder material into coarse particles and fine particles by a gas stream, a supply port and a dispersed gas stream port for pressure-feeding the powder material are provided as means for forming the mixed gas. (Japanese Patent Application Laid-Open No. 7-1995)
008916).

Conventionally, a cylindrical dispersion chamber is provided, and powder is pressure-fed by a pressure pipe so as to form a vortex along the peripheral surface inside the dispersion chamber. A classifier that classifies the powder by centrifugal force at a first compressed air supply pipe that supplies compressed air to the inside of the pressure pipe so as to accelerate the powder that is pressure-fed in the space between the pressures. The powder fed into the dispersion chamber by the pressure feed pipe collides and is guided to the outer peripheral side, and an appropriate interval is provided between the powder and the peripheral surface of the dispersion chamber so that the guided powder passes therethrough. A crushing plate disposed in the dispersion chamber, and a compressed air supplied into the dispersion chamber so as to accelerate powder flowing along the peripheral surface of the dispersion chamber. A powder classifier having a second compressed air supply pipe has been proposed. See Japanese Unexamined Patent Publication No. 39687).

In each of the above-mentioned conventional proposals, compressed air is mixed into an inlet of a dispersion chamber for supplying a pulverized material to a dispersion chamber, thereby increasing the flow rate of the powder material supplied to the dispersion chamber, and increasing the flow rate in the dispersion chamber. To promote the dissociation of the agglomerated particles to improve the classification performance.

[0012]

However, in such a conventional air-flow classifier, compressed air is mixed into the inlet of the dispersion chamber for supplying the pulverized material to the dispersion chamber. Energy-efficient classifiers themselves have poor energy efficiency, and are required to be more efficient.
It is necessary to introduce compressed air into the inflow port of the dispersion chamber, so that the classifier itself is further increased in size and further efficiency is required.

Therefore, the invention according to claim 1 is based on a dispersion chamber inflow pipe which extends in the tangential direction of the cylindrical shape and communicates with the dispersion chamber on the upper outer peripheral surface of the cylindrical dispersion chamber. The primary air flow containing the powder material is introduced into the dispersion chamber, and the powder material dispersed in the dispersion chamber is mixed with the outer peripheral edge of the conical center core disposed below the dispersion chamber and the inner peripheral wall of the dispersion chamber. The secondary air is introduced into the classifying chamber through the annular gap between the secondary air and the secondary air flowing from the secondary air inlet in the circumferential direction of the conical separator core disposed at the lower part of the classifying chamber. The powder material is swirled by air to classify into coarse particles and fine particles, and the classified fine particles are discharged from a fine particle discharge port formed in the center of the separator core. To discharge the classified coarse particles from the annular coarse particle discharge port , Near the opening to the dispersion chamber of the dispersion chamber inlet tube, after narrowing the predetermined flow path area at a predetermined reduction ratio the flow path of the dispersion chamber inlet tube towards the flow direction of the primary air,
By providing a flow channel reduction / expansion portion that expands the flow channel area at a predetermined expansion rate, the flow rate of primary air is increased in the flow channel reduction / expansion portion, and the density of the powder material in the flow channel is increased. The body material is made to collide at a high speed, the flow rate of the primary air flow is rapidly reduced, and the secondary material is collided by the speed change of particles having different particle diameters of the powder material. The agglomerated particles are introduced into the dispersion chamber in a sufficiently dispersed state, and the dispersion and classification of the powder material in the subsequent dispersion chamber and the classification chamber are improved, so that the classification performance can be improved at a small size and at low cost. An object of the present invention is to provide an airflow classifier.

According to a second aspect of the present invention, the channel reducing / enlarging portion is formed in a chevron shape on a wall surface inside the dispersion chamber inflow pipe so as to protrude toward the center of the flow path of the dispersion chamber inflow pipe over a predetermined range. By forming the curved surface of the chevron-shaped skirt portion into a curved surface having the same radius of curvature as the radius of the cylindrical dispersion chamber, the flow rate of the primary air is changed in the flow channel reducing / enlarging portion to cause the powder material to collide. In addition, the primary air flow is merged with the swirling flow of the dispersion chamber along a curved surface having the same radius of curvature as the radius of the dispersion chamber, and the powder material with a simple configuration, particularly,
Smoothly introduce the agglomerated particles into the dispersion chamber, and improve the dispersion and classification of the powder material in the subsequent dispersion chamber and classification chamber to further improve the classification performance at a small size and at low cost. It is an object of the present invention to provide an airflow classifier that can be operated.

According to a third aspect of the present invention, in the dispersion chamber inflow pipe, the flow path in the dispersion chamber inflow pipe is divided into a plurality of flow paths, and the flow path area of each of the divided flow paths is set in the flow direction of the primary air. After narrowing to a predetermined flow area at a predetermined reduction rate, the flow area is expanded at a predetermined expansion rate, and the flow path is reduced in a state where the flow area is gathered again in one flow path in or near the dispersion chamber. By arranging the enlarged portion, the powder material collides with the change in the flow rate of the primary air in each of the plurality of flow passages, and the powder material again collides at the merging portion of the flow passages. Then, the powder material is introduced into the dispersion chamber in a state in which the powder material, particularly the agglomerated particles, is more sufficiently dispersed with a simple structure, and the powder material is dispersed and classified in the subsequent dispersion chamber and classification chamber. To improve the classification performance even more compactly and inexpensively. And its object is to provide a air classifier that can.

According to a fourth aspect of the present invention, the angle of the flow passage reducing / enlarging portion with respect to the flow direction of the primary air flow in the dispersion chamber inflow pipe can be adjusted by the angle adjusting mechanism. It is an object of the present invention to provide a small and inexpensive airflow classifier capable of appropriately changing according to the particle size of particles to be classified and performing high-precision classification corresponding to various particle sizes.

According to a fifth aspect of the present invention, the vibration mechanism
By allowing the passage contraction / enlargement section to be subjected to a predetermined period of vibration in a predetermined direction, the direction, size, and further the period can be adjusted according to the state of the aggregated particles of the powder material, the particle size of the particles to be classified, and the like. It is an object of the present invention to provide a small and inexpensive airflow classifier capable of changing and vibrating a channel expansion / contraction section to perform more accurate classification corresponding to various particle diameters.

[0018]

According to a first aspect of the present invention, there is provided an airflow classifying apparatus, comprising: a cylindrical dispersion chamber; and a cylindrical tangential direction extending at a predetermined position on an upper outer peripheral surface of the dispersion chamber. A dispersion chamber inflow pipe for introducing a primary air flow including a powder material, which is disposed in communication with the dispersion chamber and includes a powder material, to the dispersion chamber;
A classifying chamber disposed in communication with the dispersion chamber through an annular gap between the outer peripheral edge of the conical center core disposed at the lower part of the dispersion chamber and the inner peripheral wall of the dispersion chamber, A conical separator core disposed at the lower portion of the classifying chamber and having a fine particle discharge port formed in the center thereof and having an annular coarse particle discharge port formed between the outer peripheral edge thereof and the inner peripheral wall of the classifying chamber. And a secondary air inlet disposed at a portion facing the outer peripheral edge of the separator core and inflow of secondary air in the circumferential direction of the separator core, and the powder material from the dispersion chamber inflow pipe. The containing primary air is introduced into the dispersion chamber, and after the powder material is dispersed by swirling in the dispersion chamber, the powder material is introduced into the classification chamber from the annular gap of the center core, The separator from the secondary air inlet In the air-flow type classification device, the powder material is swirled by the secondary air flow flowing in the circumferential direction to classify into coarse particles and fine particles, and discharged from the coarse particle discharge port and the fine particle discharge port. The dispersion chamber inflow pipe, near the opening to the dispersion chamber, after narrowing the flow path of the dispersion chamber inflow pipe toward the flow direction of the primary air at a predetermined reduction rate to a predetermined flow area, The above-described object is achieved by providing a flow passage reducing / enlarging portion for expanding the flow passage area at an enlargement ratio of.

According to the above configuration, the powder material is supplied from the dispersion chamber inflow pipe which is provided on the upper outer peripheral surface of the cylindrical dispersion chamber so as to extend in the tangential direction of the cylindrical shape and communicate with the dispersion chamber. The containing primary air flow is introduced into the dispersing chamber, and the powder material dispersed in the dispersing chamber is moved between the outer peripheral edge of the conical center core disposed at the lower part of the dispersing chamber and the inner peripheral wall of the dispersing chamber. The secondary air is introduced into the classifying chamber through the annular gap, and the secondary air flows from the secondary air inlet in the circumferential direction of the conical separator core disposed at the lower part of the classifying chamber, and the secondary air causes powder The material is swirled to classify into coarse particles and fine particles, and the classified fine particles are discharged from a fine particle discharge port formed at the center of the separator core, and an annular ring is formed between the outer peripheral edge of the separator core and the inner peripheral wall of the classification chamber. When discharging the classified coarse particles from the coarse particle discharge port, In the vicinity of the opening of the pipe to the dispersion chamber, after narrowing the flow path of the dispersion chamber inflow pipe toward the flow direction of the primary air at a predetermined reduction rate to a predetermined flow area, the flow path at a predetermined expansion rate A flow path reduction / expansion section that increases the area is provided, so the primary air velocity is increased in the flow path reduction / expansion section to increase the density of the powder material in the flow path and collide the powder material at high speed. Along with the primary air flow
Secondary collisions can be made by changing the speed of particles having different particle diameters of the powder material, and the powder material, especially the aggregated particles, can be introduced into the dispersion chamber in a sufficiently dispersed state with a simple structure, and the subsequent dispersion The dispersion and classification of the powder material in the chamber and the classification chamber can be improved, and the classification performance can be improved at a small size and at low cost.

In this case, for example, as described in claim 2, the flow channel reducing / enlarging portion projects over a predetermined range on a wall surface inside the dispersion chamber inflow pipe toward the center of the flow path of the distribution chamber inflow pipe. And the curved surface of the base portion of the chevron may be formed as a curved surface having the same radius of curvature as the radius of the cylindrical dispersion chamber.

According to the above construction, the channel reducing / enlarging portion is formed in the shape of a mountain on the wall surface inside the dispersion chamber inflow pipe so as to protrude toward the center of the flow path of the dispersion chamber inflow pipe over a predetermined range. Since the curved surface of the base of the shape is formed as a curved surface having the same radius of curvature as the radius of the cylindrical dispersion chamber, the flow rate of the primary air is changed at the flow path reducing and expanding section to collide the powder material, The primary air stream joins the swirling flow of the dispersion chamber along the curved surface with the same radius of curvature as the radius of the dispersion chamber, and the powder material, especially the agglomerated particles, is dispersed smoothly with a simple structure with sufficient dispersion. It can be introduced into the chamber, and the dispersion and classification of the powder material in the subsequent dispersion chamber and classification chamber can be improved, and the classification performance can be further improved at a small size and at low cost.

For example, as described in claim 3, the flow passage reducing / enlarging portion divides the flow passage in the dispersion chamber inflow pipe into a plurality of flow passages, and the flow passage of each of the divided flow passages After reducing the area to a predetermined flow path area at a predetermined reduction rate in the primary air flow direction, the flow path area is expanded at a predetermined expansion rate, and 1 is again set in the dispersion chamber or in the vicinity of the dispersion chamber. It may be arranged so as to extend over a predetermined length in the dispersion chamber inflow pipe in a state of being gathered in one flow path.

According to the above construction, the flow path in the dispersion chamber inflow pipe is divided into a plurality of flow paths in the dispersion chamber inflow pipe, and the flow path area of each of the divided flow paths is set in the direction of the primary air flow. After narrowing to a predetermined flow area at a predetermined reduction rate, the flow path area is enlarged at a predetermined expansion rate, and the flow path reduction / expansion unit is assembled again in one flow path in or near the dispersion chamber. Since the powder material collides with the change in the flow rate of the primary air in each of the plurality of flow paths divided into a plurality of flow paths, the powder material collides again at the merging portion of the flow paths. The powder material can be introduced into the dispersion chamber in a state where the aggregated particles are more sufficiently dispersed with a simple configuration, and the powder material can be dispersed in the subsequent dispersion chamber and the classification chamber. And improve classification, and further improve classification performance in a small size and at low cost Door can be.

[0024] Further, for example, as set forth in claim 4, the air flow type classifier includes an angle adjusting mechanism for adjusting an angle of the flow passage reducing / enlarging portion with respect to a flow direction of a primary air flow in the dispersion chamber inflow pipe. May be further provided.

According to the above arrangement, the angle adjusting mechanism allows
Since the angle of the flow passage reduction / enlargement portion with respect to the flow direction of the primary air flow in the dispersion chamber inflow pipe is adjustable, the angle of the flow passage reduction / enlargement portion can be appropriately changed according to the particle size of the particles to be classified. In addition, high-precision classification corresponding to various particle sizes can be performed at a small size and at low cost.

Further, for example, as described in claim 5, the airflow type classification device may further include a vibrating mechanism for imparting a predetermined period of vibration to the flow path reducing / enlarging portion in a predetermined direction. Good.

According to the above configuration, the vibrating mechanism makes it possible to apply a predetermined period of vibration to the channel reducing / enlarging portion in a predetermined direction. In accordance with the above, the direction and size of the channel and the period can be changed to vibrate the channel reducing / enlarging portion, and more accurate classification corresponding to various particle sizes can be performed at a small size and at low cost. .

[0028]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

FIGS. 1 and 2 show a first embodiment of an airflow classifier according to the present invention.
According to claim 1, a reduction / enlargement portion for reducing / expanding an inflow passage is provided at an inlet portion of a dispersion chamber for introducing a powder material and a primary air flow into the dispersion chamber.

FIG. 1 is a front sectional view of an airflow classifier 1 to which the first embodiment of the airflow classifier of the present invention is applied.
FIG. 2 is a sectional view taken along the line AA of FIG.

In FIG. 1, an air flow type classification device 1 has a lower casing 3, a main casing 4 and a dispersion chamber 5 arranged in this order on a hopper 2, and a dispersion chamber 5 An inflow pipe 6 is attached.

The dispersion chamber 5 is formed in a cylindrical shape.
A dispersion chamber exhaust port 7 is provided at the center. As shown in FIG. 2, which is a cross-sectional view taken along the line AA in FIG. 1, the dispersion chamber inflow pipe 6 is disposed so as to extend in a tangential direction of a cylindrical shape, and is a powder material to be classified. And the primary air carrying the powder material flows in the direction indicated by the arrow in FIG.

In the dispersion chamber inflow pipe 6, near the opening to the dispersion chamber 5, the flow area of the dispersion chamber inflow pipe 6 is reduced at a predetermined reduction rate, and then enlarged at a predetermined expansion rate. A reduction / expansion section (flow path reduction / expansion section) 8 is formed, and the reduction / expansion section 8 flows along the flow direction of the dispersion chamber inflow pipe 6 from the portion where the flow area of the dispersion chamber inflow pipe 6 is reduced most. It is formed in a mountain shape having a base portion for smoothly reducing the road area and smoothly expanding the road area.

Therefore, the powder material and the primary air flow flowing in the dispersion chamber inflow pipe 6 in the direction of the arrow in FIG. A contraction region 9a indicated by a broken line in FIG. 2 is formed, and the passage area is enlarged from a position where the passage portion passes through the narrowest portion of the reduction / enlargement portion 8 to be enlarged. 9b is formed.

Referring again to FIG. 1, the powder material and the primary air flow introduced into the dispersion chamber 5 from the dispersion chamber inflow pipe 6 circulate in the dispersion chamber 5 as indicated by the arrow in FIG. The material descends from the dispersion chamber 5 to the main casing 4, and the primary air flow is discharged from the dispersion chamber exhaust port 7 provided in the center of the dispersion chamber 5.

In the lower part of the dispersion chamber 5, a conical center core 10 whose center is higher at the center is disposed, and a classification chamber 11 is formed below the center core 10. A predetermined annular gap is formed between the outer peripheral edge of the center core 10 and the inner wall surface of the dispersion chamber 5 to form a supply groove 12 for supplying a powder material to the classification chamber 11.

The center core 1 at the bottom of the classifying chamber 11
Below 0, a conical separator core 13 is provided, and at the center of the separator core 13, a fine powder outlet (fine particle outlet) 14 is opened. A predetermined annular space is formed between the outer peripheral edge of the separator core 13 and the inner wall surface of the main body casing 4 which is the inner wall surface of the classifying chamber 11, and a coarse powder exhaust port (coarse particle discharge port) 15 is formed. Are formed, and the coarse particles that have passed through the coarse powder exhaust port 15 are stored in the hopper 2 below the separator core 13.

The separator core 1 of the main body casing 4
A secondary air inlet 16 having a blade shape is formed circumferentially at a portion opposing the secondary air inlet 3.
The jetting of the swirling secondary airflow onto the upper surface portion of the separator core 13 disperses the powder material and accelerates the swirling speed of the swirling airflow in the classification chamber 11.

Next, the operation of the present embodiment will be described. The airflow type classification device 1 flows a primary airflow containing a powder material to be classified into the dispersion chamber 5 from the dispersion chamber inflow pipe 6 and the dispersion chamber 5.
The primary air flow containing the powder material is swirled to separate and separate the coarse particles and the relatively small particles in the powder material by centrifugal force. The material is swirled in the dispersion chamber 5 by the swirling flow, and the agglomerated particles in the powder material are dissociated (dispersed) by the centrifugal force of the swirling flow or the collision between the powder material and the wall of the dispersion chamber 5, and the dispersion is performed. The separated coarse particles and the fine particles are separated from the supply groove 12 while keeping the distance between the particles away from each other, while preventing reaggregation.
Supply quickly into 1.

The powder material supplied to the classification chamber 11 is further divided in the classification chamber 11 by the conical shape of the center core 10, the conical shape of the separator core 13, and the secondary air flow flowing from the secondary air inlet 16. Turned, and from the difference in weight,
Fine particles gather at the center of the separator core 13 and are discharged from the fine powder exhaust port 14, and coarse particles are stored in the hopper 2 from the coarse powder exhaust port 15.

In this case, as described above, the dispersion chamber inflow pipe 6
In the powder material supplied to the dispersion chamber 5 from the above, coarse particles and fine particles are strongly agglomerated, and are not dispersed even by the swirling airflow inside the dispersion chamber 5 or the collision with the inner wall surface of the dispersion chamber 5. Exists, and the aggregated particles include those obtained by attaching fine particles to coarse particles. When the aggregated particles are sent from the dispersion chamber 5 to the classifying chamber 11 as they are, the fine particles are not dissociated in the classifying chamber 11 but enter the hopper 2 from the coarse powder exhaust port 15 as coarse particles as they are. When the coarse particles are used as a toner, when the aggregated particles are later dissociated and separated into coarse particles and fine particles, the particle size distribution changes, the classification accuracy is reduced, and in the electrophotographic image forming method, , The image quality is significantly reduced.

However, the airflow classification device 1 of the present embodiment
Is formed in the dispersion chamber inflow pipe 6 with a reduction / enlargement portion 8,
When the primary air flow containing the powder material passing through the dispersion chamber inflow pipe 6 reaches the contraction region 9a shown in FIG. 2 by the contraction / enlargement unit 8, the flow passage area is sharply reduced in the contraction region 9a, The flow velocity increases. In the contraction region 9a, the particle density of the powder material in the primary air flow increases, and the collision probability between the particles increases. In particular, for the aggregated particles having a large apparent particle size, the collision probability is further increased. And the number of collisions between particles of the powder material increases. Agglomerated particles that are strongly agglomerated by the collision of the particles of the powder material are dissociated (dispersed).

When the primary air flow containing the powder material passes through the top of the reduction / enlargement section 8, it reaches the expansion area 9b shown in FIG. 2, where the flow velocity sharply decreases. In addition, the flow velocity of the powder particles suddenly decreases, and the difference in the particle size between the fine particles and the coarse particles of the powder particles, particularly the difference in the particle size from the aggregated particles, in the flow direction of the dispersion chamber inflow pipe 6. The secondary particles collide with each other due to the change in velocity, and dissociation (dispersion) is promoted. The aggregated particles are dissociated and flow into the dispersion chamber 5 with almost no aggregated particles.

As described above, the powder material flowing into the dispersion chamber 5 is further dissociated (dispersed) by collision of particles in the dispersion chamber 5 due to swirling airflow and collision with the wall surface of the dispersion chamber 5. , Is immediately sent to the classification room 11,
Then, the particles are swirled by the secondary air from the secondary air inlet 16, and coarse particles are transferred from the coarse particle exhaust port 15 into the hopper 2 due to the difference in the turning radius due to the difference in centrifugal force depending on the particle size. The powder is quickly and accurately classified and discharged from the fine powder exhaust port 14 at the center of the separator core 13.

As described above, the airflow classifier 1 of this embodiment is arranged on the upper outer peripheral surface of the cylindrical dispersion chamber 5 so as to extend in the tangential direction of the cylindrical shape and communicate with the dispersion chamber 5. A primary air flow containing the powder material is introduced into the dispersion chamber 5 from the provided dispersion chamber inflow pipe 6, and the powder material dispersed in the dispersion chamber 5 is conically shaped in the lower part of the dispersion chamber 5. Is introduced into the classifying chamber 11 through the supply groove 12 which is an annular gap between the outer peripheral edge of the center core 10 and the inner peripheral wall of the dispersion chamber 5, and a conical separator disposed below the classifying chamber 11. Core 13
Secondary air flows in from the secondary air inlet 16 in the circumferential direction of
When the powder material is swirled by the secondary air to classify the particles into coarse particles and fine particles, and the fine particles are discharged from the fine particle exhaust port 14 and the coarse particles are discharged from the coarse particle exhaust port 15, Near the opening to the dispersion chamber 5, the dispersion chamber inflow pipe 6
After reducing the width of the flow path to a predetermined flow path area at a predetermined reduction rate in the primary air flow direction, a reduction / enlargement unit 8 is provided for expanding the flow path area at a predetermined expansion rate.

Accordingly, the flow rate of the primary air is increased in the reduction / enlargement section 8 to increase the density of the powder material in the flow path, thereby causing the powder material to collide at a high speed and to rapidly reduce the flow rate of the primary air flow. By slowing down, secondary collisions can be made by changing the speed of particles having different particle diameters of the powder material, and the powder material, especially the aggregated particles, can be introduced into the dispersion chamber in a sufficiently dispersed state with a simple structure. Thus, the dispersion and classification of the powder material in the subsequent dispersion chamber 5 and the classification chamber 11 can be improved, and the classification performance can be improved at a small size and at low cost.

FIG. 3 is a view showing a second embodiment of the airflow type classification device according to the present invention. In this embodiment, the skirt portion of the reduction / enlargement section provided in the dispersion chamber inflow pipe is provided in the dispersion chamber. It is formed on a curved surface having the same curvature as the radius, and corresponds to claim 2.

This embodiment is applied to an airflow classifier similar to the airflow classifier of the first embodiment. In the description of the present embodiment, the first embodiment will be described. The same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 3 is a plan cross-sectional view of the dispersion chamber 5 and the dispersion chamber inflow pipe 21 of the airflow classifier 20 to which the second embodiment of the airflow classifier of the present invention is applied.

In FIG. 3, the dispersion chamber 5 has a predetermined radius R
Is formed in a cylindrical shape having an airflow classifier 20
The dispersion chamber inflow pipe 21 is attached to the cylindrical dispersion chamber 5 so as to extend in the tangential direction.

In the dispersion chamber inflow pipe 21, near the opening to the dispersion chamber 5, the flow area of the dispersion chamber inflow pipe 21 is reduced at a predetermined reduction rate, and then enlarged at a predetermined enlargement rate. A reduction / expansion portion (flow channel reduction / expansion portion) 22 is formed, and the reduction / expansion portion 22 flows along the flow direction of the dispersion chamber inflow pipe 21 from the portion where the flow area of the dispersion chamber inflow pipe 21 is reduced most. The road area is formed in a chevron shape having a base portion for reducing the road area at a predetermined reduction rate and expanding at a predetermined expansion rate.

The reduction / enlargement portion 22 has a skirt portion, particularly a skirt portion on the dispersion chamber 5 side, formed into a smooth curved surface having a radius of curvature P of the same size as the radius R of the dispersion chamber 5.

In the airflow classifier 20 of this embodiment,
As shown by arrows in FIG. 3, the primary air flow including the powder material flowing in the dispersion chamber inflow pipe 21 in the direction of the dispersion chamber 5 is a skirt portion on the front side in the flow direction of the primary air flow of the reduction / enlargement section 22. By narrowing the flow path, the flow velocity sharply increases, the probability of collision between the powder materials increases, and by colliding at high speed,
Aggregated particles are dissociated (dispersed). When the primary air flow containing the powder material passes through the top portion of the reduction / expansion section 22, it flows down the skirt portion on the dispersion chamber 5 side, the flow path is rapidly expanded, and the flow velocity drops rapidly. Then, the fine particles having different particle diameters, the coarse particles, and the remaining aggregated particles collide with each other due to a speed difference caused by the weight difference, and flow into the dispersion chamber 5 in a dissociated (dispersed) state.

At this time, the flow of the reduction / expansion unit 22 is disturbed because at least the skirt portion on the dispersion chamber 5 side is formed on a smooth curved surface having the same radius of curvature P as the radius R of the dispersion chamber 5 without irregularities. Without dispersing, the powder particles flow into the dispersion chamber 5 while being kept in a dispersed state, and supply the powder particles dispersed in the swirling airflow inside the dispersion chamber 5.

The powder particles supplied to the dispersion chamber 5 are further dispersed in the dispersion chamber 5 and immediately supplied to the classification chamber 11 as in the first embodiment. And coarse particles are classified into the hopper 2 and the fine powder exhaust port 1
It is discharged to 4.

Therefore, the powder material is caused to collide with the flow rate of the primary air in the reduction / expansion section 22 and the primary air flow is caused to flow along the curved surface having the same curvature radius P as the radius R of the dispersion chamber 5. By merging with the swirling flow, the powder material, particularly the agglomerated particles, can be smoothly introduced into the dispersion chamber 5 with a simple structure in a state of being sufficiently dispersed. By improving the dispersion and classification of the powder material, the classification performance can be further improved at a small size and at low cost.

FIG. 4 is a view showing a third embodiment of an airflow classifier according to the present invention. In this embodiment, the flow path is divided into two while reducing and expanding the flow path in the inflow pipe of the dispersion chamber. And a reduction / enlargement section for merging.
It corresponds to.

This embodiment is applied to an airflow classifier similar to the airflow classifier of the first embodiment. In the description of this embodiment, the first embodiment will be described. The same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 is a plan sectional view of the dispersion chamber 5 and the dispersion chamber inflow pipe 31 of the airflow type classification device 30 to which the third embodiment of the airflow type classification device of the present invention is applied.

In FIG. 4, the dispersion chamber 5 is formed in a cylindrical shape, and the air-flow classifier 30 is provided with a cylindrical dispersion chamber 5.
A dispersion chamber inflow pipe 31 is attached so as to extend in the tangential direction.

In the dispersion chamber inflow pipe 31, near the opening to the dispersion chamber 5, the flow path of the dispersion chamber inflow pipe 31 is divided into two, and the flow passage area of each divided flow path is set to a predetermined value. A reduction / enlargement portion 32 is formed to reduce the flow rate at a predetermined reduction rate and then expand at a predetermined expansion rate. The reduction / enlargement portion 32 reduces the flow path area of the divided flow path of the dispersion chamber inflow pipe 31 by the primary air flow. The cross-section having a skirt portion for smoothly reducing the flow path area divided from the most reduced portion along with the flow direction is formed substantially in a disk shape.
The reduction / enlargement portion 32 is formed in a state where the skirt portion on the dispersion chamber 5 side joins near the opening to the dispersion chamber 5 and disappears.

In the airflow classifier 30 of the present embodiment,
As indicated by arrows in FIG. 4, the primary air flow containing the powder material flowing in the dispersion chamber inflow pipe 31 in the direction of the dispersion chamber 5 is directed toward the flow side of the primary air flow of the reduction / enlargement section 32 in FIG. In the base part where bulges occur in the middle and vertical directions, the flow path is divided into two, and the flow path is narrowed, the flow velocity rises sharply, the probability of collision between powder materials rises, , The aggregated particles are dissociated (dispersed).

When the primary air flow containing the powder material passes through the top portion of the reduction / enlargement section 32, it flows down the skirt portion on the dispersion chamber 5 side, the flow path is rapidly expanded, and the flow velocity is reduced. While rapidly decreasing, they merge at the end of the base of the reduction / enlargement section 32 (the confluence area indicated by the circle 33 in FIG. 4), and the fine particles, the coarse particles, and the remaining agglomerated particles having different particle diameters have a speed difference due to the weight difference. Collide with each other, and are further dissociated (dispersed).
In particular, the remaining agglomerated particles flow into the dispersion chamber 5 in a state of being further dissociated (dispersed) by collision.

The powder particles supplied to the dispersion chamber 5 are further dispersed in the dispersion chamber 5 and then immediately supplied to the classification chamber 11 as in the first embodiment. And coarse particles are classified into the hopper 2 and the fine powder exhaust port 1
It is discharged to 4.

As described above, according to the airflow type classification device 30 of the present embodiment, the flow path in the dispersion chamber inflow pipe 31 is divided into two flow paths in the dispersion chamber inflow pipe 31 and divided. After narrowing the flow channel area of each flow channel toward the primary air flow direction at a predetermined reduction ratio to a predetermined flow channel area, the flow channel area is expanded at a predetermined expansion ratio, and again in the vicinity of the dispersion chamber 5. Since the reduction / enlargement portion 32 is disposed in a state of being gathered in one flow path, the powder material collides with the change in the flow rate of the primary air in each of the two flow paths divided into two flow paths. The powder material is collided again at the merging portion 33 of the path, and the powder material can be introduced into the dispersion chamber 5 with a simple configuration in which the powder material, in particular, the aggregated particles are more sufficiently dispersed. By improving the dispersion and classification of the powder material in the subsequent dispersion chamber 5 and classification chamber 11, Inexpensively classification performance can be further improved.

In the present embodiment, the inside of the dispersion chamber inflow pipe 31 is divided into two flow paths by the reduction / enlargement section 32, but the number of divided flow paths is not limited to two. Alternatively, the reduction / enlargement portion may be formed so as to be appropriately divided into two or more numbers.

FIG. 5 is a view showing a fourth embodiment of the airflow classifier according to the present invention. In this embodiment, the flow path is divided into two while reducing and expanding the flow path in the dispersion chamber inflow pipe. In addition, a reduction / enlargement portion having a streamline shape to be joined is formed, and corresponds to claim 3.

This embodiment is applied to an airflow classifier similar to the airflow classifier of the first embodiment. In the description of this embodiment, the first embodiment will be described. The same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 5 is a plan sectional view of a dispersion chamber 5 and a dispersion chamber inflow pipe 41 of an airflow classifier 40 to which the fourth embodiment of the airflow classifier of the present invention is applied.

In FIG. 5, the dispersion chamber 5 is formed in a predetermined cylindrical shape, and the air-flow classifier 40 is arranged so that the dispersion chamber inflow pipe 4 extends in the cylindrical dispersion chamber 5 in a tangential direction.
1 is attached.

In the dispersion chamber inflow pipe 41, near the opening to the dispersion chamber 5, the flow path of the dispersion chamber inflow pipe 41 is divided into two, and the area of each of the divided flow paths is set to a predetermined value. After reducing at a reduction rate of, a reduction / enlargement section 42 for enlarging at a predetermined expansion rate is formed substantially at the center of the flow path of the dispersion chamber inflow pipe 41, and the reduction / enlargement section 42 After being divided into two and the flow passage area of each divided flow passage is rapidly reduced, the flow passage area of the divided flow passage is smoothly reduced along the flow direction of the primary air flow, The cross section for smoothly expanding the road area is formed substantially streamlined. The end of the reduction / enlargement section 42 on the dispersion chamber 5 side is
It is formed in such a state that it disappears integrally near the opening to the dispersion chamber 5.

In the airflow classifier 40 of the present embodiment,
As indicated by arrows in FIG. 5, the primary air flow containing the powder material flowing in the dispersion chamber inflow pipe 41 in the direction of the dispersion chamber 5 is directed toward the flow side of the primary air flow of the reduction / enlargement section 42 in FIG. At the part where a predetermined bulge occurs suddenly in the middle and vertical directions, the flow path is divided into two, and the flow path is smoothly narrowed, the flow velocity rises rapidly, and the flow is disturbed. As the probability of collision between the powder materials increases due to the rise of the particles, and the particles collide at high speed, the aggregated particles are dissociated (dispersed) and the flow thereof is disturbed.
Furthermore, collision between powder materials occurs, and powder materials, particularly,
Aggregated particles are dissociated (dispersed).

After the primary air flow containing the powder material is accelerated by the streamline shape of the reduction / enlargement section 42 and passes through the top portion, it flows down the skirt portion on the dispersion chamber 5 side, and the flow path is reduced. While being enlarged smoothly, the flow velocity is reduced,
At the end of the base 2 (the converging area indicated by circle 43 in FIG. 5), the fine particles, the coarse particles, and the remaining agglomerated particles having different particle diameters collide with each other due to the speed difference caused by the weight difference, The particles are further dissociated (dispersed) and merged, so that the particles, particularly the remaining aggregated particles, collide with each other and flow into the dispersion chamber 5 in a more dissociated (dispersed) state.

The powder particles supplied to the dispersing chamber 5 are further dispersed in the dispersing chamber 5 and immediately supplied to the classifying chamber 11 as in the first embodiment. And coarse particles are classified into the hopper 2 and the fine powder exhaust port 1
It is discharged to 4.

FIG. 6 is a view showing a fifth embodiment of the airflow classifier according to the present invention. In this embodiment, the flow path is divided into two parts while reducing and expanding the flow path in the dispersion chamber inlet pipe. In addition, the streamlined converging / reducing portion is arranged to be inclined at a predetermined angle with respect to the flow of the primary air flow, and the angle can be adjusted.

This embodiment is applied to an airflow classifier similar to the airflow classifier of the first embodiment. In the description of the present embodiment, the first embodiment will be described. The same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 6 is a plan sectional view of a dispersion chamber 5 and a dispersion chamber inflow pipe 51 of an airflow classifier 50 to which the fifth embodiment of the airflow classifier of the present invention is applied.

In FIG. 6, the dispersion chamber 5 is formed in a predetermined cylindrical shape, and the air-flow classifier 50 is provided in the cylindrical dispersion chamber 5 so as to extend in the tangential direction of the dispersion chamber inflow pipe 5.
1 is attached.

In the dispersion chamber inflow pipe 51, near the opening to the dispersion chamber 5, the flow path of the dispersion chamber inflow pipe 51 is divided into two, and the flow path area of each divided flow path is set to a predetermined value. A reduction / enlargement section 52 for reducing the image at the predetermined reduction rate and then enlarging the image at a predetermined expansion rate is formed. The reduction / enlargement section 52 divides the dispersion chamber inflow pipe 51 into two, After abruptly reducing the flow path area of the divided flow path, the flow path area is smoothly reduced along the flow direction of the primary air flow, and the cross section for smoothly expanding the flow path area is substantially streamlined. Is formed. The reduction / enlargement portion 52 is formed such that the end on the dispersion chamber 5 side disappears integrally near the opening to the dispersion chamber 5, and the dispersion chamber inflow pipe 51.
A predetermined angle θa with respect to the center (represented by line X0 in FIG. 6).
Only in the tangential direction of the dispersion chamber 5 (in the upward direction in FIG. 6), that is, the tangential direction of the dispersion chamber 5 by a predetermined angle θa with respect to the flow direction of the primary air flow (the direction of the line X0 in FIG. 6). It is disposed in an inclined state.

In the airflow classifier 50 of the present embodiment,
As shown by the arrows in FIG. 6, the primary air flow containing the powder material flowing in the dispersion chamber inflow pipe 51 in the direction of the dispersion chamber 5 is the same as that shown in FIG. At the part where a predetermined bulge occurs suddenly in the middle and vertical directions, the flow path is divided into two, and the flow path is smoothly narrowed, the flow velocity rises rapidly, and the flow is disturbed. As the probability of collision between the powder materials increases due to the rise of the particles, and the particles collide at high speed, the aggregated particles are dissociated (dispersed) and the flow thereof is disturbed.
Furthermore, collision between powder materials occurs, and powder materials, particularly,
Aggregated particles are dissociated (dispersed). Further, the reduction / enlargement unit 5
2 is arranged at a predetermined angle θa with respect to the flow direction X0 of the primary air flow, so that the distance between the dispersion chamber inflow pipe 51 and the reduction / enlargement portion 52 depends on the inclination direction of the reduction / enlargement portion 51. The flow rate of the primary air flow of each of the two flow paths divided into two flow paths changes according to the difference in the distance between the dispersion chamber inflow pipe 51 and the reduction / enlargement portion 52, and the change in the flow velocity , The dissociation (dispersion) of the aggregation quantum is promoted.

The primary air flow containing the powder material is accelerated by the streamline shape of the reduction / enlargement section 52 and, after passing through the top, flows down the skirt of the dispersion chamber 5. While the flow path is smoothly expanded and the flow velocity decreases, they merge at the end of the base of the contraction / expansion section 52 (the converging area indicated by the circle 53 in FIG. 6), and the fine particles and the coarse particles and the remaining aggregated particles having different particle diameters. Are mutually dissociated (dispersed) due to the speed difference caused by the weight difference, and are merged, so that the particles, particularly the remaining aggregated particles, collide and are further dissociated (dispersed). Then, it flows into the dispersion chamber 5. Further, the flow rates of the primary air flows flowing through the two divided flow paths are different due to the inclination of the reduction / enlargement portion 52, and the two asymmetric primary air flows having different flow velocities merge in the merge area 53. I do. As a result, the collision between the powder materials, particularly the aggregated particles, occurs more frequently, and the powder material flows into the dispersion chamber 5 in a more dissociated (dispersed) state.

The powder particles supplied to the dispersion chamber 5 are further dispersed in the dispersion chamber 5 and immediately supplied to the classification chamber 11 as in the first embodiment. And coarse particles are classified into the hopper 2 and the fine powder exhaust port 1
It is discharged to 4.

Therefore, since the reduction / enlargement portion 52 is disposed at a predetermined angle θa with respect to the flow direction X0 of the primary air flow in the dispersion chamber inflow pipe 51, the aggregated particles are further dispersed and dispersed. It can be introduced into the chamber 5, and the classification performance can be further improved.

In the above description, the reduction / enlargement unit 5
2 is fixedly arranged in a state of being inclined by a predetermined angle θa with respect to the flow of the primary air flow.
It may be arranged so that the angle can be adjusted by a predetermined angle adjusting mechanism. In this way, the powder material is most efficiently dissociated (dispersed) in accordance with the powder material to be classified, the flow rate and the flow rate of the primary air flow, and in particular, the particle size of the powder particles to be classified. The angle of the reduction / enlargement unit 52 can be appropriately adjusted by the angle adjusting mechanism, and the classification performance of the airflow type classification device 50 can be further improved.

FIG. 7 is a view showing a sixth embodiment of the airflow classifier according to the present invention. In this embodiment, the flow path is divided into two while reducing and expanding the flow path in the dispersion chamber inflow pipe. At the same time, a streamlined reduction / enlargement part to be merged is arranged, and
At the distal end portion on the dispersion chamber side, a merging front end inclined at a predetermined angle with respect to the flow of the primary air flow is disposed, and the merging front end can be adjusted in angle. Things.

This embodiment is applied to an airflow classifier similar to the airflow classifier of the first embodiment. In the description of the present embodiment, the first embodiment will be described. The same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 7 is a plan sectional view of a dispersion chamber 5 and a dispersion chamber inflow pipe 61 of an airflow type classification device 60 to which a sixth embodiment of the airflow type classification device of the present invention is applied.

In FIG. 7, the dispersion chamber 5 is formed in a predetermined cylindrical shape, and the air-flow type classification device 60 is provided in the cylindrical dispersion chamber 5 so as to extend in the tangential direction of the dispersion chamber inflow pipe 6.
1 is attached.

In the dispersion chamber inflow pipe 61, near the opening to the dispersion chamber 5, the flow path of the dispersion chamber inflow pipe 61 is divided into two, and the flow passage area of each divided flow path is set to a predetermined value. A reduction / enlargement portion 62 is formed to reduce the size at a predetermined reduction ratio and then expand at a predetermined magnification ratio. The reduction / enlargement portion 62 divides the dispersion chamber inflow pipe 61 into two, After abruptly reducing the flow path area of the divided flow path, the flow path area is smoothly reduced along the flow direction of the primary air flow, and the cross section for smoothly expanding the flow path area is substantially streamlined. Is formed. Dispersion room 5 of reduction / expansion unit 62
A substantially triangular tip member 63 extends along the curved surface of the reduction / enlargement portion 62 and also near the opening to the dispersion chamber 5 at the side end.
The distal end member 63 has a distal end portion on the dispersion chamber 5 side with respect to the center of the dispersion chamber inflow pipe 51 (indicated by a line X0 in FIG. 7) at a predetermined angle θb. A state inclined in the center direction (downward in FIG. 7), that is,
With respect to the flow direction of the primary air flow (the direction of line X0 in FIG. 7),
It is arranged in a state of being inclined toward the center of the dispersion chamber 5 by a predetermined angle θb.

In the airflow classifier 60 of this embodiment,
As indicated by the arrow in FIG. 7, the primary air flow including the powder material flowing in the dispersion chamber inflow pipe 61 in the direction of the dispersion chamber 5 is directed to the front side in FIG. The flow path is divided into two parts at the portion where a predetermined bulge suddenly occurs in the up and down direction, and the flow path is smoothly narrowed, the flow velocity rises sharply, and the flow is disturbed. As the probability of collision between the powder materials increases due to the rise of the particles, and the particles collide at high speed, the aggregated particles are dissociated (dispersed) and the flow thereof is disturbed.
Furthermore, collision between powder materials occurs, and powder materials, particularly,
Aggregated particles are dissociated (dispersed).

Then, the primary air flow containing the powder material is accelerated by the streamline shape of the reduction / enlargement portion 62, passes through the top portion, flows along the curved surface of the reduction / enlargement portion 62, Flowing along the curved surface of 63, the flow path is smoothly expanded, and the flow velocity is reduced, while merging at the front end of the front end member 63 (the confluence area indicated by a circle 64 in FIG. 7), and fine particles and coarse particles having different particle diameters. And the remaining agglomerated particles collide with each other due to the speed difference caused by the weight difference, and are further dissociated (dispersed).
In particular, the remaining agglomerated particles flow into the dispersion chamber 5 in a state of being further dissociated (dispersed) by collision.

Further, a tip member 63 disposed in a state of being continuous with the end of the reduction / expansion section 62 on the dispersion chamber 5 side is disposed in a state of being inclined by a predetermined angle θb with respect to the flow direction of the primary air flow. Therefore, the flow velocity of the primary air flow divided into the two flow paths changes, and two asymmetric primary air flows having different flow velocities merge in the junction area 64. Therefore, the collision between the powder materials, particularly the aggregated particles, occurs more frequently, and the powder material flows into the dispersion chamber 5 in a more dissociated (dispersed) state.

The powder particles supplied to the dispersion chamber 5 are further dispersed in the dispersion chamber 5 and immediately supplied to the classification chamber 11 as in the first embodiment. And coarse particles are classified into the hopper 2 and the fine powder exhaust port 1
It is discharged to 4.

In the above description, the tip member 63
Is fixedly arranged at a predetermined angle with respect to the flow of the primary air flow, but the tip member 63 may be arranged so that the angle can be adjusted by a predetermined angle adjustment mechanism. In this way, the angle at which the powder material is most efficiently dissociated (dispersed) in accordance with the powder material to be classified, the flow rate and the flow rate of the primary air flow, and particularly, the particle size of the powder particles. The angle of the tip member 63 can be appropriately adjusted by the angle adjusting mechanism,
The classification performance of the airflow classifier 60 can be further improved.

FIG. 8 is a view showing a seventh embodiment of the airflow classifier according to the present invention. In this embodiment, the flow path is divided into two while reducing and expanding the flow path in the dispersion chamber inflow pipe. At the same time, a streamline-shaped reduction / enlargement portion to be merged is formed, and this reduction / enlargement portion is vibrated.

This embodiment is applied to an airflow classifier similar to the airflow classifier of the first embodiment. In the description of this embodiment, the first embodiment will be described. The same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 8 is a plan sectional view of a dispersion chamber 5 and a dispersion chamber inflow pipe 71 of an airflow classifier 70 to which the seventh embodiment of the airflow classifier of the present invention is applied.

In FIG. 8, the dispersion chamber 5 is formed in a predetermined cylindrical shape, and the air-flow classifier 70 is installed in the cylindrical dispersion chamber 5 so as to extend in the tangential direction of the dispersion chamber inlet pipe 7.
1 is attached.

In the dispersion chamber inflow pipe 71, near the opening to the dispersion chamber 5, the flow path of the dispersion chamber inflow pipe 71 is divided into two, and the flow area of each divided flow path is set to a predetermined value. A reduction / enlargement portion 72 is formed to reduce the image at a predetermined reduction ratio and then expand the image at a predetermined enlargement ratio. The reduction / enlargement portion 72 divides the dispersion chamber inflow pipe 71 into two, After abruptly reducing the flow path area of the divided flow path, the flow path area is smoothly reduced along the flow direction of the primary air flow, and the cross section for smoothly expanding the flow path area is substantially streamlined. Is formed. The reduction / enlargement portion 72 is formed such that its end on the dispersion chamber 5 side disappears integrally near the opening to the dispersion chamber 5.

The reduction / expansion unit 72 is connected to a vibration mechanism (not shown). The vibration mechanism moves the reduction / expansion unit 72 in the primary air flow direction as shown by the closed arrow in FIG. , A vibration of a predetermined magnitude is applied in a vertical direction at a predetermined frequency.

In the airflow classifier 70 of this embodiment,
As shown by the arrows in FIG. 8, the primary air flow including the powder material flowing in the dispersion chamber inflow pipe 71 in the direction of the dispersion chamber 5 is directed to the front side in FIG. At the portion where a predetermined bulge occurs suddenly in the vertical direction, the flow path is divided into two, and the flow path is smoothly narrowed, the flow velocity rises rapidly, and the flow is disturbed. As the probability of collision between the powder materials increases due to the rise of the particles, and the particles collide at high speed, the aggregated particles are dissociated (dispersed) and the flow is disturbed.
Furthermore, collision between powder materials occurs, and powder materials, particularly,
Aggregated particles are dissociated (dispersed).

At this time, the contracting / enlarging portion 72 is vibrated in a direction perpendicular to the flow direction of the primary air flow by a vibration mechanism (not shown). As a result, a turbulence occurs in the primary airflow flowing along the reduction / enlargement portion 72. The turbulence of the primary air flow further increases the probability of collision between the powder materials, collides at high speed, and dissociates (disperses) the aggregated particles.

Then, the primary air flow containing the powder material is accelerated by the streamline shape of the reduction / enlargement section 72 and, after passing through the top portion, flows down the skirt portion on the dispersion chamber 5 side. While the flow path is smoothly expanded and the flow velocity decreases, they merge at the end of the base of the reduction / expansion section 72 (the converging area indicated by the circle 73 in FIG. 8), and the fine particles and the coarse particles and the remaining aggregated particles having different particle diameters. Are mutually dissociated (dispersed) due to the speed difference caused by the weight difference, and are merged, so that the particles, particularly the remaining aggregated particles, collide and are further dissociated (dispersed). Then, it flows into the dispersion chamber 5. In particular, the reduction / enlargement portion 72 is vibrated by the vibration mechanism, and the two divided primary air flows become an asymmetrical flow and merge in the merging region 73, so that the number of collisions of the remaining aggregated particles is further increased. Thus, the powder material flows into the dispersion chamber 5 in a more dissociated (dispersed) state.

The powder particles supplied to the dispersion chamber 5 are further dispersed in the dispersion chamber 5 and immediately supplied to the classification chamber 11 as in the first embodiment. And coarse particles are classified into the hopper 2 and the fine powder exhaust port 1
It is discharged to 4.

As described above, since the vibrating mechanism applies vibrations of the contraction / enlargement unit 72 in a predetermined direction in a predetermined cycle,
Depending on the state of the agglomerated particles of the powder material, the particle size of the particles to be classified, and the like, the direction and size, and even the period, can be changed to vibrate the reduction / enlargement section 72, and various small and inexpensive particles Classification can be performed with higher accuracy corresponding to the diameter.

In the above description, the case where the reduction / expansion unit 72 having the same shape as the reduction / expansion unit 42 of the airflow classifier of the fourth embodiment shown in FIG. As described above, the reduction / expansion unit to be vibrated is not limited to the same shape as the reduction / expansion unit of the fourth embodiment. The reduction / expansion unit of the airflow classifier of the first embodiment is described. Accordingly, the present invention can be similarly applied to any shape of the reduction / enlargement portion of the airflow type classification device of the fifth embodiment.

FIG. 9 is a view showing an eighth embodiment of the airflow classifier according to the present invention. In this embodiment, the flow path is divided into two while reducing and expanding the flow path in the inflow pipe of the dispersion chamber. At the same time, a streamlined reduction / enlargement part to be merged is arranged, and
At the tip of the dispersion chamber, a merging tip inclined at a predetermined angle with respect to the flow of the primary air flow is provided, and the merging tip is vibrated. Is what you do.

This embodiment is applied to an airflow classifier similar to the airflow classifier of the first embodiment. In the description of this embodiment, the first embodiment will be described. The same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 9 is a plan sectional view of a dispersion chamber 5 and a dispersion chamber inflow pipe 81 of an airflow classifier 80 to which the eighth embodiment of the airflow classifier of the present invention is applied.

In FIG. 9, the dispersion chamber 5 is formed in a predetermined cylindrical shape, and the air-flow classifier 80 is installed in the cylindrical dispersion chamber 5 so as to extend in the tangential direction of the dispersion chamber inflow pipe 8.
1 is attached.

In the dispersion chamber inflow pipe 81, near the opening to the dispersion chamber 5, the flow path of the dispersion chamber inflow pipe 81 is divided into two, and the flow passage area of each divided flow path is set to a predetermined value. A reduction / enlargement portion 82 is formed for reducing the image at a predetermined reduction ratio and then enlarging the image at a predetermined expansion ratio. The reduction / enlargement portion 82 divides the dispersion chamber inflow pipe 81 into two, After abruptly reducing the flow path area of the divided flow path, the cross-sectional area for smoothly reducing the flow path area along the flow direction of the primary air flow and expanding the flow path area is substantially streamlined. Is formed. Dispersion room 5 of reduction / enlargement unit 82
A substantially triangular tip member 83 extends along the curved surface of the reduction / enlargement portion 82 and near the opening to the dispersion chamber 5 at the side end.
The tip member 83 has a tip portion on the dispersion chamber 5 side inclined with respect to the center of the dispersion chamber inflow pipe 81 by a predetermined angle toward the center of the dispersion chamber 5, that is,
With respect to the flow direction of the primary air flow, the dispersion chamber 5 is at a predetermined angle.
Are arranged in a state of being inclined toward the center of the vehicle.

The tip member 83 is connected to a vibration mechanism (not shown). The vibration mechanism moves the tip member 83 in the direction of the primary air flow as shown by the closed arrow in FIG. To give a vibration of a predetermined magnitude at a predetermined frequency in the vertical direction.

In the airflow classifier 80 of the present embodiment,
As shown by the arrows in FIG. 9, the primary air flow including the powder material flowing in the dispersion chamber inflow pipe 81 in the direction of the dispersion chamber 5 is directed to the front side in FIG. The flow path is divided into two parts at the portion where a predetermined bulge suddenly occurs in the up and down direction, and the flow path is smoothly narrowed, the flow velocity rises sharply, and the flow is disturbed. As the probability of collision between the powder materials increases due to the rise of the particles, and the particles collide at high speed, the aggregated particles are dissociated (dispersed) and the flow thereof is disturbed.
Furthermore, collision between powder materials occurs, and powder materials, particularly,
Aggregated particles are dissociated (dispersed).

The primary air flow containing the powder material is accelerated by the streamline shape of the reduction / enlargement section 82, passes through the top portion, flows along the curved surface of the reduction / enlargement section 82, and then flows through the tip member. Flowing along the curved surface of 83, the flow path is smoothly expanded and the flow velocity is reduced, while merging at the tip of the tip member 83 (the confluence area indicated by the circle 84 in FIG. 9), the fine particles and the coarse particles having different particle diameters And the remaining agglomerated particles collide with each other due to the speed difference caused by the weight difference, and are further dissociated (dispersed).
In particular, the remaining agglomerated particles flow into the dispersion chamber 5 in a state of being further dissociated (dispersed) by collision.

Further, a distal end member 83, which is provided continuously to the end of the reduction / enlargement section 82 on the dispersion chamber 5 side, is provided in a state of being inclined by a predetermined angle with respect to the flow direction of the primary air flow. Therefore, the flow velocity of the primary air flow divided into the two flow paths changes, and the two asymmetric primary air flows having different flow velocities merge in the merge area 84. Therefore, the collision between the powder materials, particularly the aggregated particles, occurs more frequently, and the powder material flows into the dispersion chamber 5 in a more dissociated (dispersed) state.

Further, the tip member 83 is vibrated by the vibrating mechanism, and the divided primary air flow is divided into two.
As a result of the vibration, the flow becomes an asymmetric flow and merges in the merge area 73, and the number of collisions of the remaining aggregated particles further increases,
The powder material flows into the dispersion chamber 5 in a more dissociated (dispersed) state.

The powder particles supplied to the dispersing chamber 5 are further dispersed in the dispersing chamber 5 and then immediately supplied to the classifying chamber 11 as in the first embodiment. And coarse particles are classified into the hopper 2 and the fine powder exhaust port 1
It is discharged to 4.

As described above, since the vibrating mechanism applies the vibration of the tip member 83 of the reduction / enlargement portion 82 in a predetermined direction at a predetermined period, the state of the agglomerated particles of the powder material and the particle size of the particles to be classified are determined. The direction and size of the tip member 83 can be changed in accordance with the direction, the size, and the period, so that the tip member 83 can be vibrated.

Further, the tip member 83 is fixedly arranged and vibrated while being inclined at a predetermined angle with respect to the flow of the primary air flow, but the tip member 83 can be adjusted in angle by a predetermined angle adjusting mechanism. May be arranged. This way,
According to the powder material to be classified, the flow velocity and flow rate of the primary air flow, etc., and in particular, the particle size of the powder particles, the angle at which the powder material is most efficiently dissociated (dispersed) is adjusted by the angle adjusting mechanism. The angle of the tip member 83 can be adjusted appropriately, and the classification performance of the airflow type classification device 80 can be further improved.

Although the invention made by the inventor has been specifically described based on the preferred embodiments, the invention is not limited to the above-described embodiment, and various modifications may be made without departing from the gist of the invention. It goes without saying that it is possible.

[0121]

According to the air-flow type classification device of the first aspect of the present invention, the air-flow classifier is disposed on the upper outer peripheral surface of the cylindrical dispersion chamber so as to extend in the tangential direction of the cylinder and communicate with the dispersion chamber. The primary air flow containing the powder material is introduced into the dispersion chamber from the dispersion chamber inflow pipe, and the powder material dispersed in the dispersion chamber is supplied to the outside of the conical center core disposed at the lower part of the dispersion chamber. Secondary air is introduced into the classifying chamber through an annular gap between the peripheral edge and the inner peripheral wall of the dispersion chamber, and from the secondary air inlet in the circumferential direction of the conical separator core disposed at the lower part of the classifying chamber. And the powdered material is swirled by the secondary air to classify into coarse particles and fine particles, and the classified fine particles are discharged from a fine particle discharge port formed in the central portion of the separator core. Coarse particles classified from an annular coarse particle outlet between the inner peripheral wall of the classification chamber When discharging the dispersion chamber, near the opening of the dispersion chamber inflow pipe to the dispersion chamber, the flow path of the dispersion chamber inflow pipe was narrowed to a predetermined flow area at a predetermined reduction ratio toward the flow direction of the primary air. After that, a flow path reduction / expansion section that expands the flow path area at a predetermined expansion rate is provided, so that the flow rate of the primary air is increased at the flow path reduction / expansion section to increase the density of the powder material in the flow path. In addition to causing the powder material to collide at a high speed, the flow velocity of the primary air flow is sharply reduced, and the secondary collision is caused by a change in the speed of particles having different particle diameters of the powder material. In particular, the agglomerated particles can be introduced into the dispersion chamber in a sufficiently dispersed state, and the dispersion and classification of the powder material in the subsequent dispersion chamber and the classification chamber can be improved, and the classification performance can be reduced in size and at low cost. Can be improved.

According to the second aspect of the present invention, the flow path reducing / expanding portion extends over the wall surface inside the dispersion chamber inflow pipe over a predetermined range toward the center of the flow path of the dispersion chamber inflow pipe. Since it is formed in the shape of a chevron, the curved surface of the base of the chevron is formed as a curved surface having the same radius of curvature as the radius of the cylindrical dispersion chamber. The primary air flow joins the swirling flow of the dispersion chamber along a curved surface having the same radius of curvature as the radius of the dispersion chamber, and the powder material, in particular, the agglomerated particles can be sufficiently mixed with a simple structure. Can be smoothly introduced into the dispersion chamber in a dispersed state, and the dispersion and classification of the powder material in the subsequent dispersion chamber and the classification chamber are improved, thereby further improving the classification performance at a small size and at low cost. be able to.

According to the third aspect of the present invention, the flow path in the dispersion chamber inflow pipe is divided into a plurality of flow paths in the dispersion chamber inflow pipe, and the flow area of each of the divided flow paths is determined. Is reduced in the predetermined flow area at a predetermined reduction rate in the flow direction of the primary air, and then the flow path area is expanded at a predetermined expansion rate. Since the channel reduction / enlargement part is arranged in the state of being assembled,
The powder material collides with the change in the flow rate of the primary air in each of the flow paths divided into a plurality of flow paths, and the powder material collides again at the merging portion of the flow paths, so that the powder material has a simple configuration. In particular, the powder material can be introduced into the dispersion chamber in a state where the aggregated particles are more sufficiently dispersed, and the dispersion and classification of the powder material in the subsequent dispersion chamber and the classification chamber are improved.
Classification performance can be further improved at a small size and at low cost.

According to the air flow classifier of the fourth aspect of the present invention, the angle of the flow passage reducing / enlarging portion with respect to the flow direction of the primary air flow in the inflow pipe of the dispersion chamber can be adjusted by the angle adjusting mechanism. The angle of the road reduction / enlargement portion can be changed as appropriate in accordance with the particle size of the particles to be classified, and small-sized and inexpensive high-precision classification corresponding to various particle sizes can be performed.

According to the air flow classification device of the fifth aspect of the present invention, the vibrating mechanism can apply the vibration of the flow path contracting / enlarging portion in the predetermined direction at the predetermined period, so that the agglomerated particles of the powder material are removed. Depending on the state, the particle size of the particles to be classified, and the like, the direction and size, and even the period, can be changed to vibrate the channel reduction / enlargement portion, and the size and cost are reduced to accommodate various particle sizes. High-precision classification can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic front sectional view of an airflow classifier to which a first embodiment of an airflow classifier according to the present invention is applied.

FIG. 2 is a sectional view of the dispersion chamber and the dispersion chamber inflow pipe of FIG.

FIG. 3 is a plan sectional view of a dispersion chamber and a dispersion chamber inflow pipe of an airflow classifier to which a second embodiment of the airflow classifier of the present invention is applied.

FIG. 4 is a plan sectional view of a dispersion chamber and a dispersion chamber inflow pipe of an airflow classifier to which a third embodiment of the airflow classifier of the present invention is applied.

FIG. 5 is a plan sectional view of a dispersion chamber and a dispersion chamber inflow pipe of an airflow classifier to which a fourth embodiment of the airflow classifier of the present invention is applied.

FIG. 6 is a plan sectional view of a dispersion chamber and a dispersion chamber inflow pipe of an airflow classifier to which a fifth embodiment of the airflow classifier of the present invention is applied.

FIG. 7 is a plan sectional view of a dispersion chamber and a dispersion chamber inflow pipe of an airflow classifier to which a sixth embodiment of the airflow classifier of the present invention is applied.

FIG. 8 is a plan sectional view of a dispersion chamber and a dispersion chamber inflow pipe of an airflow classifier to which a seventh embodiment of the airflow classifier of the present invention is applied.

FIG. 9 is a plan cross-sectional view of a dispersion chamber and a dispersion chamber inflow pipe of an airflow classifier to which an eighth embodiment of the airflow classifier of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air flow type classification apparatus 2 Hopper 3 Lower casing 4 Main casing 5 Dispersion chamber 6 Dispersion chamber inflow pipe 7 Dispersion chamber exhaust port 8 Reduction / expansion part 9a Shrinkage area 9b Expansion area 10 Center core 11 Classification chamber 12 Supply groove 13 Separator core 14 Fine powder Exhaust port 15 Coarse powder exhaust port 16 Secondary air inlet 20 Air flow classifier 21 Dispersion chamber inflow pipe 22 Reduction / enlargement section 30 Airflow type classification apparatus 31 Dispersion chamber inflow pipe 32 Reduction / expansion section 33 Merging area 40 Airflow type classification apparatus 41 Dispersion chamber inflow pipe 42 Reduction / expansion section 43 Merging area 50 Air flow classifier 51 Dispersion chamber inflow pipe 52 Reduction / expansion section 53 Merging area 60 Airflow classification apparatus 61 Dispersion chamber inflow pipe 62 Reduction / expansion section 63 Tip member 64 Merging area 70 Airflow Type classifier 71 Dispersion chamber inlet pipe 72 Shrinking / expanding part 73 Merging area 80 Air flow type classifier 8 Dispersion chamber inlet pipe 82 scaled part 83 tip 84 joining region

Claims (5)

[Claims] 1. A dispersion chamber having a cylindrical shape, and a powder material disposed at a predetermined position on an upper outer peripheral surface of the dispersion chamber so as to extend in a tangential direction of the cylinder and communicate with the dispersion chamber. Through a dispersion chamber inflow pipe for introducing the primary air flow into the dispersion chamber, and an annular gap between an outer peripheral edge of a conical center core disposed below the dispersion chamber and an inner peripheral wall of the dispersion chamber. A classifying chamber arranged in communication with the dispersion chamber, and a fine particle discharge port formed at the center of the classifying chamber at the lower portion of the classifying chamber and having an outer peripheral edge and an inner peripheral wall of the classifying chamber. A conical separator core having an annular coarse particle discharge port formed therebetween, and a secondary air flow that is disposed at a portion facing the outer peripheral edge of the separator core and flows secondary air in the circumferential direction of the separator core And an inlet, wherein the powder material is supplied from the dispersion chamber inlet pipe. The primary air is introduced into the dispersion chamber, and after the powder material is dispersed by swirling in the dispersion chamber, the powder material is introduced into the classification chamber from the annular gap of the center core, The powder material is swirled by the secondary air flow flowing in the circumferential direction of the separator core from the secondary air inlet to classify the particles into coarse particles and fine particles,
In the airflow classifier that discharges from the coarse particle discharge port and the fine particle discharge port, the dispersion chamber inflow pipe has a flow path of the primary air flowing through the flow path of the dispersion chamber inflow pipe near an opening to the dispersion chamber. An airflow classification device, comprising: a flow path reduction / enlargement unit that narrows a flow path area at a predetermined reduction rate in a direction to a predetermined flow area and then expands the flow path area at a predetermined expansion rate. 2. The flow path reducing / enlarging portion is formed in a chevron shape on a wall surface inside the dispersion chamber inflow pipe so as to protrude toward a center of the flow path of the dispersion chamber inflow pipe over a predetermined range. The airflow classification device according to claim 1, wherein the curved surface of the base portion of the shape is formed as a curved surface having the same radius of curvature as the radius of the cylindrical dispersion chamber. 3. The flow path reducing / enlarging section divides a flow path in the dispersion chamber inflow pipe into a plurality of flow paths and increases a flow path area of each of the divided flow paths in a direction of the primary air flow. After narrowing to a predetermined flow area at a predetermined reduction rate, the flow area is expanded at a predetermined enlargement rate, and the dispersion chamber is gathered again in one flow path in or near the dispersion chamber. The airflow classification device according to claim 1, wherein the airflow classification device is provided so as to extend over a predetermined length in the inflow pipe. 4. The air-flow classification device further comprises an angle adjusting mechanism for adjusting an angle of the flow passage reducing / expanding portion with respect to a flow direction of the primary air flow in the dispersion chamber inflow pipe. Item 3. An airflow classifier according to Item 3. 5. The airflow classifier includes a vibrating mechanism for imparting a predetermined period of vibration to the flow path reducing / enlarging section in a predetermined direction.
The airflow classifier according to any one of claims 1 to 4, further comprising: