JPH0364183B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluidized bed constituting the bed surface of a swirling fluidized bed apparatus such as a swirling fluidized bed dryer or a swirling fluidized bed granulator, and particularly relates to a fluidized bed or a doughnut-shaped bed excluding the central circular part. The range is formed by arranging a large number of fan-shaped fins at equal radial intervals while overlapping their edges, and creating a slight gap in the overlapping area to serve as a fumarole, and directing the air from this nozzle to the flow chamber. The fluidized bed is formed in such a way as to blow out hot air, and this fluidized bed is formed by a disk consisting only of upper fins and a disk consisting only of lower fins in the overlapping part. This is characterized by the fact that both disks are formed as a single piece, so that both disks can be disassembled.

A swirling fluidized bed device such as a swirling fluidized bed dryer or a swirling fluidized bed granulator has a large number of ventilation holes at the bottom of the fluidization chamber that open in a certain swirling direction, and hot air is blown up from these holes to create a fluidized bed. This method generates a swirling flow inside the room to perform drying and granulation, and the stirring and mixing of powder and granules is done more completely and uniformly than with a method that simply blows hot air upwards. It has the advantage of being able to process a large amount of powder and granular material at once.

By the way, the applicant previously formed a large number of fan-shaped fins on the bottom surface of the fluidized chamber, that is, on the fluidized bed, in a donut-shaped area excluding the center of the fluidized bed, by arranging them at equal radial intervals with their edges overlapping. Therefore, a device was developed in which a slight gap was created in the overlapping part and used as a blowhole, and an application has already been filed (Japanese Patent Application No. 70152/1983).

Compared to conventional fluidized beds, which have a large number of ventilation holes formed at intervals, this fluidized bed does not produce uneven hot air near the fluidized bed, so the degree of drying of the powder and granules becomes more uniform, especially compared to It has the advantage of being able to reliably blow hot air onto particles that are so heavy that they do not flow immediately after being added, thereby drying them. On the other hand, however, this fluidized bed has a part where the fins overlap, making it difficult to clean after use, and a part of the powder remains in this part, so that the remaining particles are recycled in the next operation. The materials that can be treated are limited because they become a cause of contamination by getting mixed into powder and granules.

The present invention has been made in view of the above points, and focuses on the fact that the fins of the fluidized bed described above are made up of a mountain fold part and a valley fold part, and each fin is divided into a mountain fold part and a valley fold part. A separate lattice-like disk is formed using each fin, and a single fluidized bed is constructed by overlapping the two. It is designed so that it can be divided.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

The figure shows a rotating fluidized bed dryer as an example, and the structure of this dryer is the same as a normal dryer of this type except for the fluidized bed. The main body of the flow chamber,
2 is a fluidized bed, and below the fluidized bed 2 is a blower 3.
are connected to each other so that the hot air sent from the blower 3 is blown into the fluidized chamber 1 through the fluidized bed 2. An exhaust duct 4 is attached to the upper end of the flow chamber 1, and a dust collector 5 is connected to the exhaust duct 4. The exhaust gas enters the dust collector 5 through the exhaust duct 4, and the fine particles contained in the exhaust gas are removed. After separating the ducts, it is released into the atmosphere. Reference numeral 6 denotes an input conveyor for inputting powder and granular materials, which are dryer materials, into the machine.Although not shown, the input amount is adjusted by detecting the internal temperature of the machine or the moisture content of the dried material discharged outside the machine. It's getting old. Also, code 7
is an outlet for taking out dried material outside the machine.

The present invention is applied to a fluidized bed dryer configured as described above, in which the fluidized bed 2 has a large number of slit-shaped nozzles 9 in a donut-shaped area around the center except for the central part. They are formed at equal radial intervals. Needless to say, the fumarole ports 9 are opened in the same swirling direction, and the hot air is ejected along the fluidized bed, so that it swirls.
To explain this part in more detail, this part is composed of the same number of fins 12 as the blowholes 9. As shown in FIG. 2, each fin 12 consists of a fan-shaped mountain-fold fin 13 passing through the center point of the fluidized bed 2 and a fan-shaped valley-fold fin 14. The downwardly inclined surface on one side and the upwardly inclined surface on the other side of the valley-folded fins 14 are overlapped with each other with an appropriate interval, and this becomes the blowhole 9.

By the way, the fluidized bed 2 is composed of a pair of upper and lower lattice plates 10 and 11, and the lattice plate 10 has mountain-folded fins 13 arranged at predetermined intervals between an inner frame 15 and an outer frame 16. On the other hand, the lattice plate 11 is formed by installing valley-folded fins 14 at the same intervals on the top between the inner frame 17 and the outer frame 18 in a lattice shape. By overlapping the two, a fluidized bed 2 is constructed, and a fumarole 9 is formed.

Incidentally, since the joint ends A of the pair of fins 13 and 14 must be in close contact with each other, an engaging pin 19 or the like is bored in the outer frame 18 to prevent the positional relationship between the two from shifting. , a means for positioning the grid plate 11 with respect to the grid plate 10 is taken. However, this positioning is not necessarily fixed. As an example, FIG.
0 can be rotated slightly, so that the positional relationship between the mountain-fold fins 13 and the valley-fold fins 14 can be slightly changed. That is, a horizontal portion 19 is formed on the valley-folded fin 14, and the joining edge of this is brought into contact with the mountain-folded fin 13. Then, since the mountain-fold fins 13 can be shifted from the valley-fold fins 14 by an amount corresponding to the width of the horizontal portion 19, for example, if the positions are shifted to the states shown in FIG. 3A to B,
Correspondingly, the width of the nozzle 9 is narrowed and the amount of hot air ejected is reduced, making it possible to form a swirling fluidized bed suitable for the material and amount of the material to be dried.

As described above, the present invention focuses on the fact that each fin of a fluidized bed constructed by stacking a large number of fan-shaped fins consists of a mountain-fold part and a valley-fold part. The fins of the mountain fold part and the valley fold part are formed separately, and the lattice plate 10 is formed using the fins of the mountain fold part, and the lattice plate 11 is formed using the fins of the valley fold part, and both are overlapped. By combining them, a fluidized bed is created. Therefore, the fluidized bed 2 can be divided into two lattice plates, and each divided lattice plate has no overlapping fins.
Since the powder and granules that have adhered to it in the previous operation can be easily removed, it is possible to process pharmaceuticals and other materials that are sensitive to contamination.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a partially cutaway perspective view, FIG. 3 is a partially cutaway exploded perspective view, and FIG. 4 is a longitudinal sectional view showing the main parts. 2; Fluidized bed, 9; Fumarole, 10; Grid plate, 1
1; Lattice plate, 12; Fins, 13; Mountain-fold fins, 14; Valley-fold fins, 15; Middle frame, 16;
Outer frame, 17; Middle frame, 18; Outer frame, 19; Horizontal portion.

Claims (1)

[Claims] 1 A large number of fan-shaped mountain-fold fins are installed between the inner frame 15 and the outer frame 16 at equal radial intervals to form the lattice plate 1.
0 is formed, and the same number of valley-folded fins as the above-mentioned mountain-folded fins are attached at equal radial intervals between the inner frame 17 and the outer frame 18 to form the lattice plate 11, and both the lattice plates are overlapped. The contact edges of the mountain-folded fins are brought into contact with the contact edges of the valley-folded fins, and the downwardly inclined surface of the mountain-folded fins and the upwardly inclined surface of the valley-folded fins are overlapped to form a gap between them. A fluidized bed characterized by forming.