JP3562640B2 - Agitation heat transfer type drying equipment with blower blades - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stirring heat transfer type drying apparatus including a drying chamber having a heat transfer surface on the inner periphery, and a stirring blade for winding up and drying the raw material along the heat transfer surface around the drying chamber.
[0002]
[Prior art]
Conventional stirring heat transfer type drying equipment has a cylindrical drying chamber into which the raw material is charged, a heat transfer surface on the cylindrical inner wall of the drying chamber that transfers heat to the raw material, and a heat transfer surface that transfers heat to the heat transfer surface. And a stirring blade disposed in the center of the bottom of the drying chamber to wind up the raw material and contact the heat transfer surface. Such a drying apparatus is known, for example, from Japanese Patent Publication No. 2958869.
[0003]
The conventional agitated heat transfer type drying apparatus has a problem that since the bottom surface of the drying chamber is flat, it takes time to collect raw materials from the drying chamber and discharge dried products, and it is not easy to clean the drying chamber. . Further, since the bottom surface of the drying chamber is not a heat transfer surface, there is a problem that the drying capacity is small compared to the volume of the drying chamber.
[0004]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-mentioned problems, and its object is to recover the raw materials from the drying chamber, discharge the dried product, and wash the drying chamber, and to reduce the volume of the drying chamber. The present invention is to provide a stirring heat transfer type drying device having high drying ability and high drying efficiency.
[0005]
[Means for Solving the Problems]
Means adopted by the present invention to achieve the above object is to form the upper part of the drying chamber into a cylindrical shape and the lower part into a conical shape, and to transfer heat to the upper and lower cylindrical and conical inner wall surfaces of the drying chamber. The drying chamber is provided with a raw material input port at the bottom of the drying chamber, a dry product outlet at the cylindrical surface at the center of the drying chamber, and a residual product outlet at the bottom of the conical surface. A stirring blade for raising the raw material along the heat transfer surface while stirring the raw material and a blowing blade for generating a downward vortex are provided coaxially at the center. The heat transfer surface is formed by a jacket surrounding the drying chamber, as is well known.
[0006]
It is preferable that a common rotation axis of the stirring blade and the blower blade is supported above and below the drying chamber, and a motor for driving the rotation axis be disposed on a ceiling.
[0007]
The lower stirring blade is composed of a plurality of blades symmetrical with respect to the axis, for example, four blades, and each blade has a spiral shape opposite to the rotation direction along the conical inner surface heat transfer surface from the lower end of the rotation shaft. It is a stirring blade that extends and then spirals along the inner heat transfer surface of the cylinder in the same direction as the direction of rotation. The outer periphery of the stirring blade is a conical inner heat transfer surface and a lower heat transfer surface at the bottom of the drying chamber. Close enough to not touch the surface.
[0008]
It is preferable that the upper blowing blade is of a double suction upper and lower blowing type, and the exhaust port of the drying chamber is provided at a position higher than the blowing blade.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
A drying apparatus according to the present invention will be described based on an embodiment shown in the drawings. 1 is a longitudinal sectional view of a drying apparatus according to an embodiment of the present invention, FIG. 2 is a front view of the blower blade of FIG. 1, and FIG. 3 is a view taken along line III-III of FIG.
[0010]
As shown in FIG. 1, a drying chamber 1 of a drying device is erected on a gantry 2. The drying chamber 1 includes a cylindrical upper part 3 and a conical lower part 4 tapering downward. The upper part 3 and the lower part 4 are surrounded by a jacket 5. The jacket 5 has an inlet 6 for introducing a heat medium such as steam from a heat source (not shown) and an outlet 7 for discharging. Thus, the upper and lower inner wall surfaces of the drying chamber 1 become the cylindrical inner surface heat transfer surface 8 and the conical inner surface heat transfer surface 9.
[0011]
A raw material inlet 10 is provided at a lower portion of the drying chamber 1, and a dried product outlet 11 is provided at a central portion. A rotating shaft 12 penetrating vertically is provided at the center of the drying chamber 1. The rotating shaft 12 is supported by bearings 13 and 14 provided on the upper part 3 and the lower part 4 of the drying chamber 1, and is rotated by a motor 15 provided on the ceiling of the upper part 3.
[0012]
As shown in FIGS. 1 to 3, a central boss 16 and a lower boss 17 are fixed to the central portion and the lower end portion of the rotating shaft 12, respectively, and four arms 18 protrude radially from the central boss 16 at an equal central angle. Let it. A stirring blade 19 composed of four blades 20 is attached to the lower half of the rotating shaft 12. Each of the blades 20 is disposed at an equal central angle to the rotation shaft 12, and the lower end is fixed to the lower boss 17 and the upper end is fixed to the arm 18. The outer peripheral edge of each blade 20 extends from the lower boss 17 to the cylindrical inner heat transfer surface 8 in a spiral not in contact with the conical inner heat transfer surface 9 of the drying chamber 1 but in a direction opposite to the rotation direction. From there, the outer peripheral edge does not come into contact with the cylindrical inner surface heat transfer surface 8, but extends close to the arm 18 in a spiral shape opposite to the rotation direction. The central angle of the lower end and upper end of each blade 20 as viewed from above is slightly larger than a right angle.
[0013]
A blower blade 21 is fixed to the upper half of the rotating shaft 12. The blower blades 21 are of a double suction upper and lower blowing type. An exhaust port 22 is provided on a wall near the ceiling of the drying chamber 1.
[0014]
Next, the operation of the drying apparatus shown in FIG. 1 will be described.
[0015]
First, as shown by an arrow A, a raw material is charged into the drying chamber 1 from the raw material charging port 10, and the motor 15 is started to rotate the rotating shaft 12 in the direction of the arrow B. At the same time, steam is introduced into the jacket 5 to heat the heat transfer surfaces 8 and 9.
[0016]
The upper blower blade 21 and the lower stirring blade 19 rotate together with the rotating shaft 12, and the blades 20 of the stirring blade 19 heat the raw material from below along the heat transfer surfaces 9, 8 by the heat transfer surfaces 8, 9. While lifting. The raw material lifted up to the upper end of the blade 20 falls on the heat transfer surface 9 having a conical inner surface at the lower portion of the drying chamber 1, and is again lifted by the blade 20 while being heated from below to above by the heat transfer surfaces 9 and 8. . When the raw material falls, it is beaten against the heat transfer surface 9 having a conical inner surface, and receives strong heat transfer from the heat transfer surface 9 to promote drying.
[0017]
The upper half fan of the blowing blade 21 in the upper part of the drying chamber 1 discharges the moisture evaporated from the raw material from the exhaust port 22 as shown by an arrow C, and the lower half fan has a high temperature as shown by an arrow D. The raw material is dried by generating a downward vortex.
[0018]
When the input raw material becomes a dried product, the outlet 11 is opened as shown by an arrow E, and the dried product is collected. Since the inner surface of the lower portion 4 of the drying chamber 1 has a conical shape tapering downward, the remaining product can be easily discharged from the remaining product discharge port 23 without leaving any remaining product.
[0019]
Since the inner wall surface of the upper portion 3 of the drying chamber 1 has a cylindrical shape and the inner wall surface of the lower portion 4 has a conical shape tapering downward, the internal residue can be flushed from above to the residue discharge port 23. Therefore, cleaning of the drying chamber 1 is extremely easy.
[0020]
【The invention's effect】
As described above, the drying apparatus of the present invention is different from the conventional drying chamber in which the bottom surface is flat and does not form a heat transfer surface, and the drying chamber has a cylindrical upper portion and a conical shape tapering downward. Since it consists of the lower part, not only the cylindrical upper inner wall surface, but also the conical lower inner wall surface is formed on the heat transfer surface, and the blowing blade is arranged coaxially with the lower stirring blade at the upper part of the drying chamber, It has the following excellent effects.
1. By using the leftover discharge port provided in the lower part of the conical shape of the drying chamber, it is easy and easy to collect and discharge the raw materials and dried products remaining in the drying chamber, and to wash out the residue with washing water, which was difficult in the past. It can be implemented reliably.
2. Since the inner surface of the conical lower portion of the drying chamber is also a heat transfer surface, the heat transfer surface is enlarged, and the drying capacity is increased.
3. The blowing blades provided at the upper part of the drying chamber generate a high-temperature descending vortex to promote the evaporation of the raw material moisture, so that the drying efficiency is improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a drying apparatus according to an embodiment of the present invention,
FIG. 2 is a front view of the blower of FIG. 1;
FIG. 3 is a view taken along line III-III in FIG. 2;
[Explanation of symbols]
1: Drying room 2: Stand 3: Upper part 4: Lower part 5: Jacket 6: Inlet (heat medium)
7: Exit (heat medium)
8: Heat transfer surface (cylindrical inner surface)
9: Heat transfer surface (conical inner surface)
10: raw material input port 11: discharge port 12: rotating shafts 13, 14: bearing 15: motor 16: central boss 17: lower boss 18: arm 19: stirring blade 20: blade 21: blowing blade 22: exhaust port 23: remaining. Product outlet

Claims (2)

A drying chamber (1) having a cylindrical upper part (3) and a conical lower part (4) tapering downward; and a cylindrical inner surface transmission formed on the inner periphery of the drying chamber upper part (3) and lower part (4). A heating surface (8) and a heat transfer surface (9) having a conical inner surface; a material inlet (10) provided at a lower portion of the drying chamber; an outlet (11) provided at a central portion of the drying chamber; A rotating shaft (12) rotatably supported at the upper and lower portions of the drying chamber by vertically penetrating the center of the shaft, a motor (15) for rotating the rotating shaft, and a lower half of the rotating shaft. A stirring blade (19) that winds the fixedly charged raw material along the conical and cylindrical heat transfer surfaces, and a blowing blade (21) that is fixed to the upper half of the rotating shaft and generates a downward vortex. Wherein the stirring blade has a plurality of blades (20) arranged at equal central angles, and The outer peripheral edge extends from the lower end of the rotating shaft along the conical inner surface heat transfer surface in a spiral shape in the direction opposite to the rotation direction to the cylindrical inner surface heat transfer surface, and from there the same rotation direction. Is a spiral heat transfer drying device provided with a blower blade, wherein the upper end is connected to an arm 18 protruding from the rotation shaft. The blower blade (21) according to claim 1, wherein the blower blade (21) is a double suction upper and lower blowout type, and an exhaust port (22) of a drying chamber (1) is provided at a position higher than the blower blade. Stir heat transfer type drying equipment.

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