JPS6017592B2 - centrifuge separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a far-D separator with improved accuracy and throughput for separating classified raw materials into fine particles and dregs.

(Prior Art) A conventional separator of this kind, as disclosed in DT-OSI607631, separates a mixture of particles of different sizes and/or shapes and/or different specific gravity into coarse particles ( (more than a certain limit diameter) and Tsumugi small grains (
This is for sorting out objects (within a certain size limit).

(Problems to be Solved by the Invention) In recent years, there has been a need for centrifugal separators that can separate finer particles and have excellent processing capabilities in terms of classification accuracy and performance.

However, the production capacity of conventional separators of this type with only one granule/selected air outlet is relatively small. Production capacity especially depends on the size of the separator,
Among other things, it depends on the length and diameter of the sorting rotor and thus on the area on which the sorting takes place. However, the diameter is controlled due to the increase in centrifugal force and is dependent on the diameter and rotational speed, and thus also on the far zero force, critical particle size. Similarly, the length of the sorting rotor is also limited by the inability to maintain a uniform sorting air flow. The purpose of this separator is to obtain particles as fine as possible with a narrow particle size distribution, aiming at a critical particle size of 2 to 4 mm.

These very fine particles are finally being used as plastics,
It is needed as a filler in automobile tires, pigments and paints, or as a coating on paper. The coarse grains are used for other purposes or are further crushed to make pongee grains.
For this purpose, it is necessary to produce each in relatively large quantities at the lowest possible cost.

However, when the bag size is increased in order to increase throughput, it becomes difficult to control the air flow and determine the classification point of the particle size to be sorted.

For this reason, many small separators are used to separate fine particles. Therefore, there were problems in that work efficiency was poor and equipment costs increased. The present invention is a separator of this type,
It is an object of the present invention to provide an apparatus which has a higher production capacity and which can select finer particles, for example, those having a limit particle size of loAm to 2 mm.

(Means for Solving the Problems) In order to achieve the above object, the centrifugal separator of the present invention includes a sorting rotor in the center of a container equipped with a sorted air intake, and A segment flange with densely spaced grooves in green and a guide plate flange radially spaced apart from the sorting rotor and integrated with the container are provided, and a sorting chamber defined by the guide plate flange and the sorting rotor is provided. , the inlet for the sorted grains and the outlet for the coarse grains are separated, and the fine grain and sorting air outlets are provided at both ends of the sorting rotor in the container, and the ratio of the diameter to the length of the sorting rotor is 1:1.
．． It is characterized by a ratio of 5 to 1:4.

(Function) The present invention has the above-described structure, so that the particles to be sorted are introduced from above into the sorting chamber (the annular chamber between the guide plate flange and the sorting rotor), and at the same time from the outside through the guide plate flange. Sorting air enters the sorting chamber, and the sorting air performs a spiral motion to guide the particles into their respective paths of motion.

This sorted air is rectified by a guide plate flange, and the particles in the sorting chamber are subjected to the action of a resistance force and a centrifugal force that oppose each other in the radial direction. Then, for a given radial and axial air velocity, there is one critical particle size such that both forces are the same. Coarse particles larger than the critical size then reach the coarse particle outlet at the lower end of the sorting chamber sooner or later. On the other hand, the fine particles are guided by the sorting air, which flows inward through the grooves of the sorting vanes in the segment flanges and connects the inner chamber of the sorting vanes to both axial ends of the sorting rotor. Small particles are sucked into the sorted air outlet. The fine particles are then separated from the sorted air, and the sorted air again reaches the sorted air inlet and can be circulated again.
(Example) To explain in more detail, one example will be shown below with reference to the drawings.

This separator has one cylindrical container 1 with one tangential sorted air intake 2, in which the sorted air is 20, evenly over the entire axial height.

Inside the container, there is a guide plate flange 9 that rectifies the sorted air using a plurality of guide plates extending in the axial direction of the container.
radially spaced from the container envelope. Further, a segment flange 11 is provided at a distance from this flange 9 in the radial direction and has a large number of segments extending in the rut direction on the outer ring periphery of the sorting rotor 10, and in which the grooves are closely spaced. There is. Particles to be sorted are fed into the sorting chamber 23 between the flanges 9 and 1 from above. Further, the upper wall of the container is provided with two annular grooves 22 for feeding the granules, and a connecting pipe 7 opens into these grooves. At the opposite end, ie, the lower end, a funnel-shaped coarse particle outlet 8 is provided. At both ends of the sorting rotor, bent pipe-shaped narrow 4, grain, sorting air outlets 3, 4 are provided, the diameter of which approximately matches the inner diameter of the rotor. Exit 3, 4
are respectively surrounded by cooling air chambers 17 and 18, into which cooling air is introduced through a connection 19. This prevents fine particles from adhering to the outlets. In the cooling air chambers 17, 18, the rotor shaft 10a passing through the curved outlets 3, 4 is also pivoted at both ends to bearings 5, 6. Therefore, this bearing is also cooled as well. Since the pressure inside the cooling air chambers 17 and 18 is high, fine particles cannot enter therein (see the arrow in the shaft hole). Drive is V-belt pulley
12. The sorting rotor 10 has both ends 1
3, 14 are closed so as to be closely connected to the outlets 3, 4. Between the sorting rotor and the containers there are packings 15 and 16, respectively, which are made in the form of a flat plate or a labyrinth. Cooling air is introduced from the cooling air chambers 17 and 18 through the cooling air groove 27 and is blocked between the sorting chamber 23 and the outlets 3 and 4 (Fig. 3,
Arrow 19). A support disk 24 having a through hole in the axial direction is heat-fitted to the mari 10a of the sorting rotor.

Turbulence prevention rings 25 and 26 are provided on the outer periphery of the rotor end, respectively. Next, the operation of this embodiment having the above configuration will be explained.

In this device, particles to be sorted as indicated by an arrow 21 pass through a connecting pipe 7, pass through an annular groove 22, and are dropped into a sorting chamber 23. Straightened sorting air is constantly fed into the sorting chamber 23 through the gap formed by the guide plate flange 9. The force and the inward air resistance force interact.
When these two forces are balanced, the inward air resistance force of the inward air resistance force is greater than the outward centrifugal force of the pongee small particles, which are smaller than the particle size, and are moved into the sorting rotor 10 by the sorted air.

Larger particles are pushed outward by outward centrifugal force.
Due to the weight of the ejected particles, they fall and are sorted out through the coarse particle outlet 8.

Since the centrifugal force is determined by the diameter and rotational force of the sorting rotor, the mass of the particle size to be sorted, etc., the diameter and rotation speed of the sorting rotor 10 are limited by the critical size of the particles to be sorted.

In consideration of such limitations, the bag straightener of the invention increases the throughput of sorted particles by setting the diameter/length ratio of the sorting rotor 10 to 1:1.5 to 1:4.

If the length of the sorting rotor 10 is increased in this way, it is difficult to make the flow velocity of the sorted air uniform. Therefore, in this sea bream, the guide plate flange 9 and the segment flange 11 that define the sorting chamber 23 have been devised. That is, both flanges 9
, 11, the direction of the sorted air is regulated by a guide plate and a separator plate extending in all directions of the axis of the sorting rower 10.
Sorting particles are controlled by differences in radial flow velocity along the sorting rotor. Such radial flow velocity depends on the suction pressure, ie, negative pressure, at the outlet. This suction pressure is maximum at the outlet and decreases towards the opposite end. Therefore, the centrifugal force exerted by the sorting rotor 10 is optimal near the outer wall of the segment flange 11 of the sorting rotor 10.
The suction force of the incoming air for sorting air is at its minimum in the sorting chamber, and in the passage between the separator plates where the interval between segment flanges is narrowed, the suction force suddenly increases, reducing the centrifugal force and improving the separation effect.

Furthermore, turbulence prevention IJ rings 2 provided at both ends of the sorting rotor 10
5 and 26 act to eliminate turbulence in the air flow near the fine particle separation air outlet.

In this way, it becomes possible to make the length of the sorting rotor 10 larger than its diameter. Furthermore, since the fine particle/separated air outlets are present at both ends, the outlet cross-sectional area is approximately doubled, and therefore, despite the increased production capacity, the flow rate is low.

On the other hand, in the case of a secondary tank, when the flow velocity is high, the pongee small particles are thrown strongly against the wall surface, so the particles adhere to the wall surface. especially,
This is the case for the first fine-grained layer. As a result, flow conditions deteriorate, resulting in a reduction in production capacity. This kind of deposits that accumulate in layers (so-called "Shobi no Kara") sometimes
It ruptures and mixes with the pongee granules, resulting in the granules being spoiled and causing great difficulty.

To prevent such deposits, limit the flow rate,
This will also limit production capacity. According to the present invention, such adhesion of fine and small particles can be prevented through one pongee small particle/sorting air outlet.

- This can be prevented by enclosing each in the vicinity of a cooling chamber in one cooling chamber. Cooled particles are less likely to adhere to cooled surfaces. In this case, it is advantageous to install the bearings of the two sorting rotor shafts in respective cooling chambers. This also cools the ball support at the same time, contributing to operational safety and extending the life of the machine. This is especially important when increasing production capacity. Furthermore, each of the front ends of the sorting rotor is provided with a labyrinth packing, which is connected through a groove to a respective cooling air chamber.

The cooling air is simultaneously circulated through the labyrinth packing from the outside to the inside, so that this packing is also cooled, but no special air source is required for this purpose. Air-cooled labyrinth packing in separator is DE-AS17
It is known by 57 spots 2. Furthermore, a support disk with through holes in the bag direction for holding the segments of the sorting rotor is heat-fitted onto the ball bar.

In this case, the rotor segments are not only fixed at their ends, but also between the ends by support discs. Finally, at the end of the container opposite the coarse outlet, an annular groove is provided for feeding the particles to be sorted into the sorting chamber.

In this way, more products can be produced evenly. (Effects) Since the present invention is configured as described above, the pongee small particles separated into the same size can be taken out from two pongee small particle/sorting air outlets, and the segment flanges allow the pongee small particles to be taken out in the radial direction of the sorting rotor. By controlling the negative pressure of the flow rate by making the groove spacing of the segment flange close, it is possible to achieve a finer separation effect.

Furthermore, by increasing the length of the sorting rotor relative to its diameter, production capacity can be increased.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a separator according to the invention. In FIG. 2, the left side is a cross-sectional view of this separator, and the right side is a plan view. Figure 3 shows part B of Figure 1, that is,
A labyrinth designed to introduce cooling air from the cooling room.
An enlarged sectional view of the packing is shown. 1... Container,
2...Selected air intake, 3, 4...Pongee small grain/sorted air outlet, 8...Coarse grain outlet, 9...
... Guide plate flange, 10 ... Sorting rotor, 11 ... Segment flange, 17, 18.
...Cooling air chamber, 25,26...Turbulence prevention ring. 】Country P2 Deviation 3 1-car F”

Claims (1)

[Scope of Claims] 1. A centrifugal separator having a substantially cylindrical upright container having a substantially tangential screening air intake, comprising: a sorting rotor coaxially and centrally located within the container; The outer ring of the sorting rotor is provided with a segment flange with closely spaced grooves that serves as a passage for fine particles and sorted air, and a guide plate flange that is radially spaced apart from the sorting rotor and integrated with the container to rectify the sorted air. a sorting chamber defined by the guide plate flange and the sorting rotor has an intake port for sorted particles opened above and a coarse outlet opened below;
Fine particles and sorting air outlets having a diameter substantially the same as the diameter of the sorting rotor are provided at both ends of the sorting rotor in the container, and the ratio of the diameter to the length of the sorting rotor is 1:1.5.
A centrifugal separator characterized by a ratio of 1:4. 2. The centrifugal separator according to claim 1, wherein both peripheral edges of the sorting rotor in the container are surrounded by cylindrical turbulence prevention rings. 3. The centrifugal separation according to claim 1 or 2, wherein a support disk having a through hole in the axial direction of the sorting rotor is shrink-fitted onto the rotor shaft. vessel. 4. The centrifugal separator according to any one of claims 1 to 3, wherein an annular groove serving as an inlet for sorted particles is provided at the end of the container opposite to the coarse particle outlet.