JPH0256157B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a rotor with classification blades arranged side by side on its periphery, which is provided in a case so as to be rotatable around a vertical axis, and which communicates with the gaps between the classification blades. A fine powder passage is formed in the rotor, and a raw material supply port, a coarse powder discharge port, and a sorting air supply port are connected to an annular classification chamber formed on the outer periphery of the classification blade, and a fine powder passage is connected to the fine powder passage. A discharge port is formed in the case, and in the classification chamber, the raw material is rotated by the action of a rotor and a classification blade, and the fine particles with a small centrifugal force are sent from the fine particle passage to the fine particle discharge port with a sorting wind, and the centrifugal force is The present invention relates to a classifier for powder and granular materials configured to send large coarse particles to a coarse powder discharge port in a direction opposite to a sorting wind.

[Conventional technology]

Conventionally, as shown in FIG. 3, the annular classification chamber 7 is formed into a simple one-room configuration, and the raw material from the raw material supply port 10 is sent to the classification chamber 7 through the passage 11, and the raw material is sent from the sorting air supply port 17 to the classification chamber 7. The wind is passed through the classification room 7 through the passage 18.
The classification blade 4 provided on the periphery of the rotor 2
The structure is such that the fine particles that have passed through are sent from the fine particle passage 5 to the fine particle outlet 14, and the coarse particles that have moved to the outer circumferential side of the classification chamber 7 are sent to the coarse particle outlet 21 (for example, 57-11269).

[Problem that the invention attempts to solve]

However, if the dispersion of the raw material supplied from the passage 11 to the classification chamber 7 becomes insufficient, a portion of the fine particles tends to flow into the coarse particle outlet 21, resulting in a disadvantage that the classification efficiency tends to decrease.

An object of the present invention is to make it possible to sufficiently and reliably improve classification efficiency even with simple modification.

[Means for solving problems]

The characteristic configuration of the present invention is that an annular classification chamber is formed on the circumference of the rotor, a main classification chamber is provided on the classification blade side at the entrance of a fine powder passage on the circumference of the rotor, a coarse powder discharge port is provided, and a sorting air supply is provided. A cylindrical partition wall that divides the re-classification chamber into a re-classification chamber with an opening communicating with the rotor is placed almost concentrically with the rotor, and an opening for sending sorting air and fine particles from the re-classification chamber to the main classification chamber is placed in the cylindrical partition wall over its entire length. A passage is formed between the lower end of the cylindrical partition wall and the rotor to send coarse particles from the main classification chamber to the re-classification chamber, and the coarse particles from the passage are recycled. A dispersion vane is installed on the rotor to distribute the supply into the classification chamber, and a sorting air outlet is connected to the sorting air supply port and faces the re-classifying chamber.
The reason is that it is arranged on the outer circumferential wall of the re-classification chamber facing the rotor side, and its effects are as follows.

[Effect]

In other words, in the main classification chamber, the coarse powder particles are moved toward the cylindrical partition by centrifugal force, descend by gravity, are sent by centrifugal force to the re-classification chamber from the passage on the lower end of the cylindrical partition, and are redispersed by the dispersion vanes. Then, it is supplied to the re-classification room, where it is classified again by the cooperation of centrifugal force and sorting air.

Therefore, even if fine particles are mixed into coarse particles during classification in the main classification chamber, the coarse particles and fine particles are separated in the re-classification chamber, and the fine particles are separated from the cylindrical partition by the sorting air. It is possible to sufficiently prevent fine particles from being returned to the main classification chamber through the opening and sent to the coarse particle outlet.

Moreover, since the sorting air is blown out from the outer peripheral wall toward the rotor in the re-classifying chamber, the fine particles mixed into the coarse particles swirling near the outer wall are also reliably delivered to the main classification chamber by the sorting air. This allows for even more accurate classification.

〔Effect of the invention〕

As a result, it has become possible to sufficiently and reliably prevent the mixing of fine particles into coarse particles, and to provide an excellent classifier with extremely high classification efficiency.

Moreover, the modification was simple, simply adding a cylindrical partition wall and dispersion vanes, and improving the arrangement of the sorting air jets, making it possible to improve the classification performance advantageously in terms of manufacturing and cost.

〔Example〕

Next, an example will be shown with reference to FIGS. 1 and 2.

A rotor 2 is attached to a rotating shaft 1 that is linked to a prime mover, and the rotor 2 is provided in a case 3 so as to be freely rotatable around the vertical axis, and a large number of classification blades 4 are attached to the rotor 2.
A fine particle passage 5 is formed in the rotor 2 and is arranged in parallel around the circumference of the rotor 2 and communicates with the gap between the classification blades 4, and a discharge blade 6 is provided in the passage 5.

Annular classification chambers 7a and 7b are formed on the outer periphery of the classification blade 4, and a cylindrical partition wall 8 that partitions the classification chambers 7a and 7b is provided approximately concentrically with the rotor 2, so that the main classification on the classification blade 4 side Both the chamber 7a and the reclassification chamber 7b outside thereof are formed into an annular shape.

A raw material supply port 10 is formed in the case 3 to supply the pneumatically transported raw material toward a guide cone 9 formed at the center of the upper part of the rotor 2.
Dispersion vanes 1 are distributed around the entire circumference of the rotor 2 on the terminal end side of a passage 11 that communicates with the main classification chamber 7a.
2 are arranged so that the raw material is swirled to the upper part of the main classification chamber 7a and is evenly supplied in a distributed manner.

An annular passage 13 communicating with the fine powder passage 5 and a fine powder discharge port 14 are formed in the case 3, and coarse powder is transferred from the main classification chamber 7a to the reclassification chamber 7b between the lower end of the cylindrical partition wall 8 and the rotor 2. Dispersion vanes 16 are attached to the rotor 2 to form a feeding passage 15 and to disperse and supply the coarse particles from the passage 15 to the re-classification chamber 7b, distributed over the entire circumference of the rotor 2. And reclassification room 7b
The sorting air supply port 17 that supplies sorting air to the ring passage 1
8 is formed in the case 3, and blower vanes 19 for forcefully feeding the sorted air to the re-classifying chamber 7b are attached to the rotor 2 in a distributed manner over the entire circumference, and the sorted air from the blower vanes 19 is sent to the re-classifying chamber 7b. Supply sorting air outlet 2
2 and 23 are arranged facing upward between the rotor 2 and an annular partition wall 24 located on the outer periphery thereof, and are also arranged on the outer peripheral wall 25 of the reclassification chamber 7b toward the rotor 2 side. Furthermore, the openings 20 that communicate the re-classification chamber 7b and the main classification chamber 7a are distributed over the entire circumference of the cylindrical partition wall 8, and the sorting air is directed in the rotational direction of the rotor 2 within the main classification chamber 7a. A coarse powder discharge port 21 is formed in the case 3 so as to be oriented so as to rotate, and communicated with the reclassification chamber 7b.

That is, in the main classification chamber 7a, fine particles and coarse particles are separated by the cooperation of the centrifugal force caused by the rotation of the raw material and the sorting wind that acts in the opposite direction. It is configured to send to. Then, the coarse powder particles in the main classification chamber 7a are transferred from the passage 15 below the cylindrical partition wall 8 to the re-classification chamber 7b.
In the re-classification chamber 7b, the mixed fine particles are separated from the coarse particles by the cooperation of centrifugal force and sorting wind, and the coarse particles are separated from the coarse particles. The discharge port 21 is configured to send fine powder particles through the opening 20 to the main classification chamber 7a using a sorting air.

Furthermore, even if fine powder particles are mixed into the coarse powder particles swirling along the outer peripheral wall 25 in the re-classification chamber 7b, the fine powder particles are directed to the sorting air outlet 23 toward the rotor 2 side.
The structure is such that the sorting air from the main classification chamber 7a reliably sends the particles to the main classification chamber 7a.

[Another example]

Next, another embodiment will be described.

The shape and mounting configuration of the cylindrical partition 8, the shape of the opening 20, and other specific structures of the classifier can be changed as appropriate. For example, at the bottom of the rotor 2,
A seal fin is provided at the position indicated by A in Fig. 1 to push out the coarse particles in the direction of the rotation radius, so that it is possible to more reliably prevent the coarse particles from flowing into the fine particle collection area. It is possible.

The direction of the sorting air outlet 23 facing the rotor 2 side may be, for example, facing the rotation center of the rotor 2, or
Direct it to the opposite side of the rotation direction of rotor 2,
In addition, the direction can be freely selected when viewed in the direction of the rotor's second rotation center.

A plurality of inlets to the coarse powder outlet 21 may be distributed in a circumferential direction of the rotor 2.

The type of target powder and the purpose of the classifier do not matter.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an embodiment of the present invention,
FIG. 3 is a vertical sectional view of the main part of the conventional example. 2...rotor, 3...case, 4...classifying blade,
5... Fine powder passageway, 7a, 7b... Classification chamber, 7a... Main classification chamber, 7b... Re-classification chamber, 8... Cylindrical partition wall, 10...
Raw material supply port, 14... Fine powder discharge port, 15... Passage,
16...Distribution vane, 17...Selecting air supply port, 20...
Opening, 21... Coarse powder outlet, 23... Sorting air outlet, 25... Outer peripheral wall.

Claims (1)

[Claims] 1. A rotor 2 with classification blades 4 arranged side by side on its circumference is provided in a case 3 so as to be freely driven and rotatable around a vertical axis,
A fine particle passage 5 communicating with the gap between the classification blades 4 is formed in the rotor 2, and annular classification chambers 7a and 7b are formed on the outer periphery of the classification blades 4.
A classifier for powder and granular materials, in which a raw material supply port 10, a coarse powder discharge port 21, and a sorting air supply port 17 communicating with the case 3, and a fine powder discharge port 14 communicating with the fine powder passage 5 are formed in the case 3. At that time, the classification rooms 7a, 7
A cylindrical partition wall 8 that partitions b into a main classification chamber 7a on the classification blade 4 side and a re-classification chamber 7b which communicates with the coarse powder discharge port 21 and the screening air supply port 17 is approximately coaxial with the rotor 2. The reclassification chamber 7
An opening 20 for sending a sorting air and fine particles from b to the main classification chamber 7a is formed in the cylindrical partition wall 8 over its entire circumference, and the lower end of the cylindrical partition wall 8 and the rotor 2 are connected to each other. In between, a passage 15 for sending coarse particles from the main classification chamber 7a to the re-classification chamber 7b is formed, and the coarse particles from the passage 15 are sent to the re-classification chamber 7.
A dispersion vane 16 is provided on the rotor 2, and a sorting air outlet 23 communicating with the sorting air supply port 17 and facing the re-classifying chamber 7b is provided on the outer peripheral wall 25 of the re-classifying chamber 7b. A classifier for powder and granular material arranged facing the rotor 2 side.