JP4476871B2 - Drying equipment - Google Patents

Description

  The present invention relates to a drying apparatus that dries, for example, a food residue or a processed product containing an organic substance generated from a water treatment apparatus.

  In general, a processed product containing as a component a food residue or an organic substance generated from a water treatment apparatus is evaporated or reduced in weight and reused. Here, a direct drying method in which hot air is blown directly on the processed material to evaporate, or a contact member such as a container is heated by a heating medium such as hot air to bring the heated contact member into contact with the processed material. Therefore, there is an indirect drying method in which the processed product is dried without directly applying a heat medium.

As a drying apparatus employing such an indirect drying method, a drying apparatus having a fixed body having a cylindrical body with side walls provided at both ends and a rotating shaft that is rotatably inserted into the fixed body is proposed. (For example, refer to Patent Document 1). Here, a plurality of stirring blades are connected to the rotating shaft, and each stirring blade is heated by a heat medium. And the to-be-dried material supplied to the inside of a cylindrical body is conveyed, stirring and drying with a some stirring blade. At this time, by providing a plurality of stirring blades, the contact area with the material to be dried increases, and the material to be dried can be efficiently dried.
The material to be dried may be in a state of having high viscosity depending on the amount of water in the material to be dried while being dried. The object to be dried in a high viscosity state adheres to the stirring blade and solidifies, thereby making it difficult to stir and transfer the object to be dried by the stirring blade, and may deteriorate the drying efficiency of the object to be dried.
Therefore, a drying apparatus has been proposed in which a fixing plate is provided so as to protrude from the inner peripheral surface of the cylindrical body toward a plurality of stirring blades. By providing the fixing plate, the object to be dried attached to the stirring blade is scraped off, and the object to be dried adheres to the stirring blade and solidifies, and the drying efficiency of the object to be dried can be maintained.
JP 2002-250590 A

  However, the following problems remain in the conventional drying apparatus. That is, in the above conventional drying apparatus, the material to be dried may adhere to and solidify on the surface on one side wall side that is arranged close to one side wall among the plurality of stirring blades. And there is a problem that the drying object newly grows and becomes a lump when the drying object newly adheres and solidifies with respect to the drying object adhered and solidified on the stirring blade, and the drying efficiency of the drying object by the drying device is lowered .

  The present invention has been made in view of the above-described problems, and provides a drying apparatus that prevents the supplied material to be dried from clumping and adhering to the stirring blade, and improving the drying efficiency of the material to be dried. The purpose is to do.

The present invention employs the following configuration in order to solve the above problems. That is, the drying apparatus of the present invention has a fixed body having a cylindrical body with side walls provided at both ends, and a plurality of stirring blades connected in the axial direction of the cylindrical body, and rotates to the fixed body. In a drying apparatus that includes a rotating shaft that is freely inserted, and that stirs and dries the material to be dried supplied in the cylindrical body in the axial direction of the rotating body. A fixing plate protruding from the inner peripheral surface of the cylindrical body is provided between the first stirring blade disposed near the one side wall of the stirring blades and the one side wall , The rotating shaft includes a side wall scraping member that scrapes off the object to be dried attached to the one side wall during rotation .

According to this invention, since the fixing plate protrudes and is provided between the side wall and the first stirring blade that is the stirring blade disposed in the vicinity of the side wall, one side wall side of the first stirring blade is provided. The object to be dried adhering to the surface can be peeled off by the fixing plate. Thereby, to-be-dried material adheres to the surface on the one side wall side of the first stirring blade and solidifies, and the to-be-dried material adheres to the solidified to-be-dried material and the to-be-dried material grows. Can be prevented. Therefore, when the material to be dried is supplied between the first stirring blade and the one side wall, the material to be dried is less likely to stay between the first stirring blade and the one side wall, toward the other side wall. It becomes easy to move the material to be dried while stirring and drying. And drying efficiency can be improved.
In addition, since the rotating shaft includes a side wall scraping member that scrapes off the object to be dried attached to the one side wall during rotation, the object to be dried is scraped by scraping the object to be dried attached to the one side wall. A thing becomes difficult to stay between a 1st stirring blade and one side wall, and can improve drying efficiency.

In the drying apparatus of the present invention, the rotating shaft includes an inclined member between the one side wall and the first stirring blade, and the outer shape of the inclined member is gradually reduced toward the first stirring blade. It is preferable that it is formed to have a diameter.
According to this invention, the to-be-dried material located between one side wall and the 1st stirring blade is sent toward the 1st stirring blade. Thereby, it can suppress that a to-be-dried object stagnates between one side wall and the 1st stirring blade, and can improve drying efficiency.

Moreover, it is preferable that the drying apparatus of this invention is provided with the internal peripheral surface scraping member which the said rotating shaft scrapes off the said to-be-dried object adhering to the internal peripheral surface of the said cylindrical body at the time of rotation.
According to the present invention, the material to be dried attached to the inner peripheral surface of the cylindrical body is scraped off so that the material to be dried is less likely to stay between the first stirring blade and the one side wall, thereby improving the drying efficiency. be able to.

Further, in the drying apparatus of the present invention, the side wall scraping member is a plate-like member whose end side is disposed with a gap between the one side wall and the side wall scraping member on the one side wall side. It is preferable that one end is provided so as to be positioned in front of the other side wall side in the rotation direction of the rotation shaft.
According to the present invention, since the front surface in the rotational direction of the side wall scraping member is formed so as to face the other side wall with respect to the rotational direction, the material to be dried attached to one side wall is separated by the side wall scraping member. And scraped off so as to be sent out toward the other side wall. Therefore, it can suppress that a to-be-dried object stagnates more between one side wall and the 1st stirring blade, and can improve drying efficiency.

  According to the drying apparatus of the present invention, the material to be dried attached to the one side wall surface of the first stirring blade is peeled off by the fixing plate, and the material to be dried is prevented from adhering, solidifying and growing. can do. Therefore, the object to be dried is less likely to stagnate between the first stirring blade and one side wall, and it becomes easy to move the object to be dried while stirring and drying toward the other side wall, and the drying efficiency is improved. Can be improved.

Hereinafter, an embodiment of a drying apparatus according to the present invention will be described with reference to the drawings.
The drying device 1 in the present embodiment is a drying device that employs an indirect drying method, and as shown in FIG. 1, a hollow fixed body 2 and a rotary shaft 3 that is rotatably inserted into the fixed body 2. And is composed of.

The fixed body 2 is provided so as to cover a cylindrical body 13 which is horizontally placed and provided with a side wall (one side wall) 11 and a side wall (the other side wall) 12 at both ends, and an outer peripheral surface of the cylindrical body 13. And a jacket (not shown).
The cylindrical body 13 has a cylindrical cross-section, and is provided with an object to be dried inlet 13A for supplying an object to be dried on the upper surface on the side wall 11 side, and is transferred through the cylindrical body 13 to the lower surface on the side wall 12 side. A to-be-dried object discharge port 13B for discharging the to-be-dried object is provided. The to-be-dried material introduction port 13A is provided slightly on the side wall 12 side from the side wall 11, and the to-be-dried material discharge port 13B is provided on the side wall 11 side slightly from the side wall 12.
Here, in the drying apparatus of the present specification, one end of the cylindrical body 13 on the side provided with the to-be-dried material introduction port 13A is an upstream end, and one end on the side on which the to-be-dried material discharge port 13B is provided Called. Further, the tubular body 13 adjusts the pressure inside the tubular body 13 by introducing air into the moisture exhaust port 13C for exhausting water vapor generated by heating the object to be dried and the tubular body 13. An air inlet 13D is provided.
The cylindrical body 13 is provided with a plurality of fixing plates 14 from the upper inner peripheral surface toward the axis of the rotary shaft 3.
The plurality of fixed plates 14 include a stirring blade 22 (hereinafter referred to as a stirring blade (first stirring blade) 22A) disposed between the plurality of stirring blades 22 described later and the side wall 11 of the plurality of stirring blades 22. And between the side walls 11 so as to protrude from each other.

The rotating shaft 3 includes a rotating shaft main body 21 and a plurality of stirring blades 22 connected in the axial direction of the rotating shaft 3, and is driven by a power source (not shown) provided outside the fixed body 2. 1 is rotatable in the direction of arrow A shown in FIG.
The rotating shaft main body 21 has a cylindrical shape, and a steam introduction port 21 </ b> A for introducing steam as a heat medium into the rotating shaft main body 21 is provided outside the fixed body 2.
The plurality of stirring blades 22 are provided to increase the contact area with the material to be dried, and are arranged at equal intervals. Further, the stirring blade 22 has a hollow disk shape, and is provided so that the hollow portion is continuous so that the steam flowing through the rotating shaft body 21 can also flow through the stirring blade 22. .
Further, the rotary shaft main body 21 is provided with an inclined member 23 and a scraping blade 24 connected to the upstream end of the inclined member 23 between the stirring blade 22A and the side wall 11. Further, the rotary shaft body 21 includes a scraping blade 25 between the stirring blade (hereinafter referred to as stirring blade 22 </ b> B) disposed among the plurality of stirring blades 22 in the vicinity of the side wall 12 and the side wall 12. Is provided.

The inclined member 23 includes an inclined member main body 31 provided around the rotary shaft main body 21 and a disc portion 32 connected to the upstream end of the inclined member main body 31.
The inclined member main body 31 has a truncated cone shape, the inner diameter of one end on the downstream side is substantially equal to the outer diameter of the rotary shaft main body 21, and the outer diameter gradually decreases from the side wall 11 toward the side wall 12. It is formed as follows. One end of the inclined member body 31 on the downstream side is connected to the upstream surface of the stirring blade 22A. Further, the disc portion 32 is provided so as to connect the upstream end of the inclined member main body 31 and the rotary shaft main body 21.

As shown in FIG. 2, the scraping blades 24 are provided radially at one end on the upstream side of the inclined member 23 at three circumferentially spaced intervals with respect to the rotating shaft 3. The scraping blade 24 includes a protruding plate portion 35 connected to the inclined member 23 and a scraping plate portion (inner peripheral surface cleaning member, sidewall cleaning member) 36 connected to the protruding plate portion 35. Has been. In FIG. 1, the scraping blade 24 is shown only at one place, and the rest is omitted.
The protruding plate portion 35 is a plate-like member provided to protrude radially outward from one end on the upstream side of the inclined member 23, and the tip that is one end radially outward of the rotating shaft 3 is the tubular body 13. It is formed so that it may be arrange | positioned through the internal peripheral surface of this and a clearance gap. Here, the gap between the tip and the inner peripheral surface of the cylindrical body 13 is, for example, 15 mm.
The scraping plate portion 36 is a plate-like member provided so as to protrude from the protruding plate portion 35 toward the side wall 11, and one side on the downstream side is a protruding plate portion on one side in the rotation direction of the protruding plate portion 35. 35 to be bent. The scraping plate portion 36 is formed so that one side on the upstream side is disposed with a gap between the side wall 11, the one side on the upstream side is located forward of the one side on the downstream side in the rotation direction, and rotates. It is arranged so that the surface on the front side in the direction faces slightly downstream with respect to the rotational direction. Here, the gap between the side on the upstream side and the side wall 11 is, for example, 25 mm. Thereby, the to-be-dried material pushed out by the scraping plate portion 36 by rotating the rotating shaft 3 is pushed downstream.

As shown in FIG. 3, the scraping blades 25 are provided radially with respect to the rotary shaft 3 at six locations equidistantly in the circumferential direction with respect to the peripheral surface of the rotary shaft main body 21. The scraping blade 25 is connected to the protruding plate portion 41 connected to the rotary shaft body 21, the protruding plate piece portion 42 connected to the stirring blade 22B, and the protruding plate portion 41 and the protruding plate piece portion 42. Part 43. In FIG. 1, the scraping blade 25 is illustrated only in one place, and the rest is omitted.
The protruding plate portion 41 is a plate-like member provided so as to protrude from the peripheral surface of the rotating shaft main body 21 toward the radially outer side of the rotating shaft 3, and the end side in the radially outer side is a connecting portion. 43.
The protruding plate piece portion 42 is a plate-like member provided so as to protrude radially outward from the stirring blade 22B, and is formed to be parallel to the protruding plate portion 41, and its radial direction. The outer end side is connected to the connection portion 43.
The connecting portion 43 is a linear rod-shaped member, one end of which is connected to the protruding plate piece portion 42, and the other end protrudes downstream from the protruding plate portion 41 and is disposed through the side wall 12 and a gap. It is formed to be. And the connection part 43 is provided so that one end of a downstream side may be located ahead of a rotation direction rather than the one end of an upstream side. Here, the gap between the other end of the connecting portion 43 and the side wall 12 is, for example, 15 mm.

Although six scraping blades 25 are formed at equal intervals in the circumferential direction with respect to the rotary shaft main body 21, a pair of scraping blades 25 provided in opposite directions with respect to the rotary shaft main body 21 are In addition, a scraping plate portion 44 provided to connect the connection portion 43 and the peripheral surface of the rotary shaft main body 21 is provided at a portion of the connection portion 43 that protrudes downstream from the protrusion plate portion 41.
The scraping plate portion 44 is provided from the connection portion 43 toward the axis of the rotary shaft main body 21, and is provided so that one end on the downstream side of the connection portion 43 is positioned forward in the rotation direction with respect to one end on the upstream side. Therefore, the surface on the front side in the rotation direction is inclined so as to face the side wall 11. Thereby, the to-be-dried material pushed out by the scraping plate portion 44 by rotating the rotary shaft 3 is pushed away upstream.

Next, a method for drying an object to be dried using the drying apparatus 1 having such a configuration will be described. First, steam as a heat medium is introduced into the rotary shaft body 21 from the steam inlet 21 </ b> A. Thereby, the plurality of stirring blades 22, 22A, 22B are heated by the steam flowing through the inside. Moreover, the cylindrical body 13 is heated by introducing steam into the jacket as a heat medium. At this time, the rotating shaft 3 is rotated.
Then, the material to be dried is supplied from the material to be dried inlet 13A. The supplied to-be-dried material is placed on the lower inner peripheral surface of the cylindrical body 13, and is sent out from the upstream side toward the downstream side as the rotating shaft 3 rotates. At this time, the material to be dried comes into contact with the inner surface of the rotating shaft body 21 and the stirring blades 22, 22 </ b> A, 22 </ b> B and the cylindrical body 13 heated by the steam, so that the moisture in the material to be dried is reduced. Evaporate to dry. Further, water vapor generated from the object to be dried by drying the object to be dried is exhausted to the outside of the fixed body 2.

Here, depending on the moisture content of the material to be dried, the material to be dried may be in a highly viscous state. And the to-be-dried material of this state may adhere to the side wall 11 or the stirring blades 22 and 22A. The material to be dried attached to the stirring blades 22 is scraped off by the fixing plate 14 provided so as to protrude from the inner peripheral surface of the cylindrical body 13 toward the stirring blades 22. The material to be dried scraped off by the fixing plate 14 is transported toward the material to be dried discharge port 13B while being stirred and dried by the stirring blade 22.
In addition, the material to be dried attached to the surface on the side wall 11 side of the stirring blade 22 </ b> A is scraped off by the fixing plate 14 provided between the stirring blade 22 </ b> A and the side wall 11. The to-be-dried material scraped off by the fixing plate 14 is transferred toward the to-be-dried material discharge port 13B while being stirred and dried by the stirring blade 22 as described above.

Further, the material to be dried adhered to the side wall 11 is scraped off by the scraping plate portion 36 of the scraping blade 24. The material to be dried scraped by the scraping plate portion 36 is sent out in the direction of the stirring blade 22 </ b> A by the inclined member 23. Then, similarly to the other objects to be dried that have not adhered to the side wall 11, the material is transferred toward the object to be dried outlet 13B while being stirred and dried by the stirring blades 22, 22A, 22B. Here, since the downstream side of the scraping plate portion 36 is positioned forward in the rotational direction with respect to the upstream side, the surface in the rotational direction forward is directed downstream with respect to the rotational direction. The material to be dried scraped off by the scraping plate portion 36 is sent out toward the downstream side.
In addition, some of the objects to be dried that are transferred while being stirred and dried by the stirring blades 22, 22 </ b> A, and 22 </ b> B may be transferred to the side wall 12 without being discharged at the objects to be dried discharge port 13 </ b> B. The material to be dried transferred to the side wall 12 is scraped off by the scraping plate portion 44 of the scraping blade 25. The to-be-dried material scraped off by the scraping plate portion 44 is sent out toward the upstream side and discharged from the to-be-dried object discharge port 13 </ b> B located slightly upstream from the side wall 12.

According to the drying apparatus 1 configured in this way, even if an object to be dried adheres to the upstream surface of the first stirring blade 22A, the object to be dried can be peeled off by the fixing plate 14. It can be prevented from growing by adhering and solidifying to the stirring blade 22A. Therefore, the material to be dried existing between the first stirring blade 22A and the side wall 11 can be more easily transferred to the side wall 12, and the drying efficiency of the material to be dried can be improved.
Further, even if an object to be dried adheres to the inner peripheral surface on the lower side of the side wall 11 or the cylindrical body 13, it can be peeled off by the scraping blade 24. And since the to-be-dried material which peeled from the upstream surface of the 1st stirring blade 22A, the side wall 11, and the inner peripheral surface of the cylindrical body 13 is sent out toward the 1st stirring blade 22A by the inclined member 23, the 1st It becomes easy to transfer the to-be-dried object existing between the stirring blade 22A and the side wall 11 toward the to-be-dried object discharge port 13B. Here, since the surface in the rotational direction of the scraping plate portion 36 is formed so as to be inclined toward the side wall 12, it is easy to transfer the material to be dried toward the material discharge port 13 </ b> B. .

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above embodiment, steam is used as the heat medium, but other heat medium such as hot water may be used.
Further, the rotary shaft 3 is configured to include the inclined member 23 and the scraping blade 24 between the stirring blade 22A and the side wall 11, but the inclined member 23 and the scraping blade 24 are not provided. It may be a structure provided only with either one. Even in this configuration, the fixing plate 14 provided so as to protrude between the stirring blade 22A and the side wall 11 adheres and solidifies the material to be dried on the upstream surface of the stirring blade 22A. Can be prevented.
Moreover, although the scraping blade | wing 24 is provided in three places around the inclination member 23, one place, two places, and four or more places may be sufficient. Further, the surface of the scraping plate portion 36 in the rotational direction is formed so as to be inclined toward the side wall 12, but is formed so that the surface in the rotational direction is directed in the rotational direction without being inclined toward the side wall 12. May be.
In addition, the scraping plate portion 36 includes an inner peripheral surface scraping member that scrapes off an object to be dried that adheres to the inner peripheral surface of the cylindrical body 13, and a side wall scraping member that scrapes off an object to be dried that adheres to the side wall 11. Although it has a function, you may provide an internal peripheral surface scraping member and a side wall scraping member as a separate member, respectively.

  According to the present invention, with respect to a drying apparatus employing an indirect drying method, the supplied material to be dried can be prevented from becoming a lump and adhering to the stirring blade, and the drying efficiency of the material to be dried can be improved. Industrial applicability is recognized.

It is a top view which shows the drying apparatus in one Embodiment of this invention. The scraping blade | wing provided in the upstream of FIG. 1 is shown, (a) is a perspective view, (b) is a front view. The scraping blade | wing provided in the downstream of FIG. 1 is shown, (a) is a perspective view, (b) is a front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drying device 2 Fixed body 3 Rotating shaft 11 Side wall (one side wall)
12 side wall (the other side wall)
13 Cylindrical body 14 Fixed plate 22, 22B Stirring blade 22A Stirring blade (first stirring blade)
23 inclined member 24 scraping blade 36 scraping plate part (inner peripheral surface scraping member, side wall scraping member)

Claims (4)

A fixed body having a cylindrical body with side walls provided at both ends, and a rotating shaft rotatably inserted into the fixed body having a plurality of stirring blades connected in the axial direction of the cylindrical body. Prepared,
In the drying apparatus that stirs and dries the material to be dried supplied into the cylindrical body while being transferred in the axial direction of the rotating body,
The fixed body protrudes from the inner peripheral surface of the cylindrical body between a first stirring blade disposed in the vicinity of the one side wall of the plurality of stirring blades and the one side wall. A board is provided ,
The drying apparatus , wherein the rotating shaft includes a side wall scraping member that scrapes off the object to be dried attached to the one side wall during rotation . The rotating shaft includes an inclined member between the one side wall and the first stirring blade,
The drying apparatus according to claim 1, wherein an outer shape of the inclined member is formed so as to gradually decrease in diameter toward the first stirring blade.   3. The drying apparatus according to claim 1, wherein the rotating shaft includes an inner peripheral surface scraping member that scrapes off the object to be dried attached to the inner peripheral surface of the cylindrical body during rotation. The side wall scraping member is a plate-like member whose end is disposed with a gap between the one side wall,
One end of the one side wall of said side wall scraping member, claim 1, characterized in that are provided so as to be positioned forward in the rotational direction of the rotary axis than the one end of the other side wall 3 The drying apparatus according to any one of the above.

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