JPS5867316A - Air separator - Google Patents

Abstract

PURPOSE:To remarkably improve a recovery yield of fivished power by making a circulating air inducing vane, fixed to the inside of an internal cylinder, rotatable by a proper rotary shaft, and providing said vane with a function to throw out the fine powder. CONSTITUTION:Powdered bodies led to the inside of an internal cylinder 4 from a powdered body supplying port 1 are thrown out in the direction of centrifugal force by a distributing plate rotated by a rotary shaft 2, and coarse particles separated by the gravity separation are discharged from a coarse-particle chute 5. Fine particles generated in finishing except the coarre particles are sucked upward and into an external cylinder 7 by the suction foue of a rotating main vane 6. Hereupon a centrifugal force field is generated in the inside of a machine by the rotation of an circulating air inducing vane 9 rotated by a rotary shaft 2, and the fine particles falling down through the cylinder 7 are recovered through a chute 8. That is, when the number of rotation of said vane 9 is in creased and an open hole-area is enlarged by adjusting fins 14 of the vane 9, a recovery yield of the powdered bodies generated in finishing is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air separator, and more particularly to an air separator that can improve the recovery efficiency of finished powder.

In a conventional so-called air separator, as shown in FIG. 1, powder supplied from a powder supply port 1 collides with the inner wall surface of an inner cylinder 4 due to the centrifugal force of a distribution plate 3 rotated by a rotating shaft 2. The coarse powder is discharged to the outside from the coarse powder chute 5 at the bottom of the inner cylinder 4, and the other fine finished powder is
It is sucked up together with the air inside 4 by the suction force generated by the 60 rotations of the main blade and blown into the outer cylinder 7, and then descends inside the outer cylinder 7. During this time, the finished powder is separated from the air and collected in the lower fine powder chute 8, and the air from which the finished powder has been separated and removed is further blown into the inner cylinder 4 from the circulation air vane 9, and then again by the main blade 6. By being sucked up, a circulating wind 10 is formed in the direction of the arrow in the figure.

On the other hand, new air is introduced into the circulating air introduction vane 9 for cooling, etc.
The outside air is blown into the inner cylinder 4 from the outside air introduction pipe 11 connected below and mixed with the circulating air 10. In the conventional air separator, the main blade 6
The finished powder that is sucked up and blown into the outer cylinder 7 is not completely separated from the air while descending inside the outer cylinder 7, and for this reason, the recovery efficiency of the finished powder is poor, and the finished powder that is not separated is In the process of circulating in the separator together with the circulating air 10, the coarse powder is captured by the coarse powder (return powder) and returns from the coarse powder 7 to the crusher (not shown), resulting in deterioration of the efficiency of the entire closed circuit crushing system. It is the cause.

The present invention solves the above-mentioned drawbacks of conventional air separators.
It provides an air separator with high separation efficiency, and its feature is that the circulating air introduction vane, which was fixed inside the cylinder, can be rotated by an appropriate rotation axis. The purpose of this invention is to provide the circulating air introducing vane with a function of brushing off fine powder, thereby significantly improving the efficiency of collecting finished powder.

Embodiments of the present invention will be described below with reference to the drawings.

2 and 3 show a first embodiment of the present invention, in which 1
is a powder supply port, 2 is a rotating shaft, 3 is a distribution plate, 4 is an inner cylinder, 5
is a coarse powder chute, 6 is a main blade, 7 is an outer cylinder, 8 is a fine powder chute, 9 is a circulating air introduction vane, 11 is an outside air introduction pipe, ]2
is an exhaust pipe and is 1. ] () indicates the circulating wind circulating in the direction of the arrow.

Therefore, in this embodiment, the circulating air introducing vane 9
is integrally connected to the distribution plate 3 by a plurality of connecting rods 13, 13..., and the distribution &
3 and the main blade 6.

Further, as shown in FIG. 3, the circulating air introduction vane 9 has a plurality of fins 14 disposed above and below each other in a connected shape 5 and 10 so as to be rotatable and fixed. After rotating the fins 14, the opening area of the introduction vane 9 can be adjusted by fixing them by appropriate means.

In addition, in FIG. 2, 17 is an open-hole throttle valve, and 18 is the main blade 6.
This is a classification blade that rotates with the

Next, the operation of this embodiment will be explained. The powder introduced into the inner cylinder 4 from the powder supply port 1 is blown away in the direction of centrifugal force by the distribution plate 3 rotated by the rotating shaft 2, and the coarse powder is discharged from the coarse powder chute 5 by gravity separation, as shown in the figure. The moth is returned to the crusher.

1. The fine finished powder other than the separated coarse powder is sucked up by the suction force of the rotating main blade 6 and blown into the outer cylinder 7.

Since the circulating air introducing vane 9 is rotated by the rotating shaft 2, a field of centrifugal force is created inside the machine by the rotation of the circulating air introducing vane 79, and the powder particles descending inside the outer cylinder 7 are The blow-off is reduced in the centrifugal direction, but on the other hand, since the circulation K1ff formed inside the machine is sucked into the inner cylinder 4 by the suction action of the main blade 6, fluid resistance is acting on the powder particles.

Therefore, the size of the particles when the centrifugal force and fluid resistance match approximately 9 at the position of the circulating air intake bay 79 is the separated particle size, and if the centrifugal force is greater than the fluid resistance, the particles are separated from the circulating air phase and finished. The powder falls as powder inside the outer cylinder 7 and is collected through the fine powder chute 8.

Here, d: Separated particle diameter (cm) Uθ: Circumferential speed of circulating air introduction vane (cm7 rotation) Ur:
The radial linear velocity (cr
rv-), it is known that the separation particle diameter at the position of the circulating air introduction vane 9 is as follows.

That is, as the rotational speed of the circulating air introduction vane 9 increases, the circumferential speed Uθ increases, so the separated particle diameter d decreases.
In addition, as the opening area of the introduction vane 9 becomes larger or as the air volume of the circulating air 10 becomes smaller, the inflow velocity '[Jr] becomes smaller and the separated particle size becomes smaller, thus improving the recovery efficiency of the finished powder. .

Therefore, in this embodiment, if the rotational speed of the circulating air introduction vane 9 is set at a constant speed and the fins 14 of the introduction vane 9 are adjusted to increase the aperture area, the finished powder recovery efficiency will be improved compared to the conventional method.

Next, FIG. 4 shows a second embodiment of the present invention. In this embodiment, the circulating air introduction vane 9 is connected to a rotating shaft 19 different from the rotating shaft 2, and a motor λ) is driven by any appropriate means. The fins 14 can be rotated by means of i.
Like the first embodiment, it is rotatable so that the aperture area of the introduction vane 9 can be adjusted.

In this embodiment, only the rotational speed of the circulating air introduction vane 9 is set at a high speed, the rotational speed of the main blade 6 and the distribution plate 30 is made small, and the opening area of the introduction vane 9 is made large, so that the above-mentioned time can be achieved. The particle size can be made smaller than in the first embodiment, and the recovery efficiency of finished powder can be further improved.

FIG. 5 shows a third embodiment of the present invention, in which a rotary shaft 2a and a rotary shaft 2b that can be rotated separately are arranged concentrically, and the rotary shaft 2a is connected to the distribution plate 3. and main blade 6
By connecting the rotary shaft 2b with the circulating air introducing vane 9, the rotation speed of only the circulating air introducing vane 9 can be increased as in the second embodiment. By making the fins 14 rotatable as in the first and second embodiments, the same effects as in the second embodiment can be achieved.

In the embodiment described above, the fins 14 of the circulating air introduction vane 9 are rotatable, but they may be fixed at an optimal opening position. Also, the position 1 of the outside air introduction pipe 11
μ may be the second part of the circulating air introduction vane 9.

For reference, in industries such as the cement industry that process a large amount of powder, relatively easy classification [15
A cyclone separator (a type in which the finished powder classified in the inner cylinder is guided to 6 to 8 cyclones connected to the outside of the cylinder and collected) is said to have a good collection efficiency of finished powder. Separator) finished powder recovery efficiency is 5
The recovery efficiency of the conventional product is only about 40% in the case of the separator of the present invention, which consists of an inner cylinder and an outer cylinder, such as a starch band separator, and the Blaine ratio of returned powder is around 3%. The surface area of the former is 720 cd4, while that of the latter is 9Boc.
It reached as much as t17g, indicating that in the latter separator, many fine powders were returned to the mill along with the returned powder.

However, if a mechanism for brushing off fine powder is provided by rotating the circulating air introducing vane as in the present invention, the efficiency of collecting finished powder can be significantly improved compared to the present invention.

According to the present invention configured as described above, since the circulating air introducing vane is rotatable by the drive shaft, it is possible to provide a function of blowing away fine powder that is not available in the prior art, and is relatively simple. This simple improvement of the mechanism has the remarkable effect of greatly improving the recovery efficiency of L-finished powder.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional example, and FIG. 2 is a first example of the present invention.
FIG. 3 is a perspective view of essential parts of the circulating air introduction vane of FIG. 2, and FIGS. 4 and 5 show a second embodiment and a third embodiment of the present invention, respectively. FIG. 2...Rotating shaft, 3...Distribution plate,
4...Inner cylinder, 6...Main blade,
7...Outer cylinder, 9...Circulating air introduction vane, 14...Fin, 19-...Rotating shaft. Figure 1 Figure 5 86-

Claims (3)

[Claims] (1) An outer cylinder and an inner cylinder are formed, and a distribution plate that is rotated by the rotating shaft and separates the powder introduced into the inner cylinder into coarse powder and fine powder; a main blade that sucks up the finished powder together with air from the inner cylinder and blows it into the outer cylinder, and a circulating air introduction vane that introduces the air inside the outer cylinder into the inner cylinder by the suction force of the main blade. An air separator in which the circulating air introducing vane is rotatable by a rotating shaft. (2) The air separator according to claim nuΣ, paragraph (1), wherein the circulating air introducing vane has a plurality of rotatably arranged fins. (3) The air separator according to claim 11 or (2), wherein the rotating shaft of the circulating air introducing vane is provided separately from the rotating shafts of the distribution plate and the main blade.