JP2840639B2 - Drying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying apparatus for drying a material to be dried while pressing it against a heat transfer surface.

[0002]

2. Description of the Related Art As is well known, there are various drying apparatuses for drying an object to be dried such as liquid, fluid or semi-fluid, powder, and granules.

[0003] As an example, the applicant of the present application has previously disclosed
A drying apparatus disclosed in Japanese Patent Publication No. -19501 was proposed. That is, the inside of the drying tank into which the object to be dried is charged, a heat transfer surface on the inner wall surface of the drying tank that transfers heat from the heat transfer means to the object to be dried, and the transfer tank located around the drying tank. A heat transfer means for transmitting heat to a hot surface, and rotatably disposed in the drying tank,
This is a drying device comprising a single vertical spiral rotary blade having a flat upper surface so that the object to be dried can be placed and raised.

[0004] That is, in the drying device, a rotating shaft arranged in the drying tank along the direction of gravity, one vertical spiral rotating blade positioned around the rotating shaft, and one end rotating. On the shaft, the other end is fixed to the vertical spiral rotating blade, and a fixing arm portion which passes through a drying object falling space described later is provided. A drying object falling space in which the drying object that has reached the upper part of the vertical spiral rotating blade falls between the inner peripheral end of the vertical spiral rotating blade and the rotating shaft, and the vertical spiral rotating A clearance is provided between the outer peripheral end of the blade and the heat transfer surface so that the object to be dried can contact the heat transfer surface.

When attention is paid to the operation of the object to be dried when the drying apparatus having the above-mentioned vertical spiral rotary blade is used, the above-mentioned object to be dried is placed on one vertical spiral rotary blade and spiraled sequentially from bottom to top. Ascends, falls down when it reaches the top, repeats a cycle of returning to its original state and rising spirally.
Then, it is pressed against the heat transfer surface by the centrifugal force during the ascent process and dried.

[0006]

According to the above prior art, there are several points to be solved in the following points. That is, the object to be dried rises while being pressed against the heat transfer surface by being placed on the vertical spiral rotating blades that are continuous from top to bottom in one piece. However, if the object to be dried is a highly viscous object to be dried or the like, and if the object to be dried once adheres to a portion of a single vertical spiral rotating blade or a heat transfer surface, then one Since there is no transport path other than the vertical spiral rotating blades, there is a possibility that congestion will occur at the above-mentioned attachment portion and the space will expand in a dumpling form and block between the upper and lower blades. For this reason, the rise of the object to be dried is stopped, and the circulation is not performed. As a result, there is a high risk that the drying does not proceed satisfactorily.

Further, since the vertical spiral rotary blades are connected in a single piece from the top to the bottom to form a spiral and extend, the clearance between the vertical spiral rotary blades and the heat transfer surface is from top to the bottom. Once a foreign substance mixed with the object to be dried enters the clearance, the vertical spiral rotary blade may not rotate well because there is no place for the foreign substance to escape.

[0008] Further, in order to raise the dried material,
It is raised by only one vertical spiral rotating blade. For this reason, the amount of the object to be dried rising is smaller than the total amount of the object to be dried located at the bottom in the drying tank, and it is difficult to bring the object to be dried into contact with the heat transfer surface at an early stage. It is difficult to improve the drying efficiency because the state in which the objects to be dried are accumulated easily.

The vertical spiral rotary blade has an interval between the upper and lower blades in accordance with the pitch of the spiral. However, when the object to be dried is pressed against the heat transfer surface by centrifugal force, Of the heat transfer surfaces between the upper and lower blades, unused heat transfer surfaces tended to occur. For this reason, the heat transfer surface is not used compared with the entire area, that is, the area where the object to be dried does not contact is relatively large, and the entire heat transfer surface is not effectively utilized.

[0010] Further, the object to be dried is spirally lifted from bottom to top, reaches the uppermost part, is dropped, and then rises again. During this time, heat is applied to the object to be dried from the heat transfer surface to dry the object. Therefore, in order to dry the object to be dried efficiently, the vertical spiral rotary blade has the best rotation speed suitable for various objects to be dried. Here, if the vertical spiral rotary blades are rotated at a speed higher than the rotation speed at which the drying efficiency of the object to be dried is the best, the object to be dried does not rise well along the spiral, and as a result, the drying efficiency also deteriorates. In other words, when trying to dry the various objects to be dried most efficiently, adjustment of the rotation speed of the vertical spiral rotary blade is indispensable, and conversely, such adjustment is troublesome.

Therefore, an object of the present invention is to provide a danger that even when a highly viscous material to be dried is dried, the material to be dried adheres to the blades and the heat transfer surface, causing the stagnation of the material to be dried. Even if foreign matter mixed in the material to be dried enters the clearance between the blades and the heat transfer surface, it is easy to escape and compared to the total amount of the material to be dried located at the bottom of the drying tank. Increases the amount of material to be dried, thereby improving the drying efficiency.Moreover, the entire heat transfer surface between the upper and lower blades is effectively used, and there is no need to adjust the rotating speed of the rotating blades. It is an object of the present invention to provide a technology for drying an object efficiently.

[0012]

In order to solve the above-mentioned object,
The present invention has the following technical means. That is, this will be described with reference to the reference numerals in the accompanying drawings corresponding to the embodiments.
And a heat transfer surface 2 on a cylindrical inner wall surface of a drying tank 4 for transferring heat from the heat transfer means to the object 3 to be dried, and a heat transfer surface located around the drying tank 4 and transferring heat to the heat transfer surface 2. The heat transfer means is rotatably disposed by being connected to a rotating shaft disposed along the direction of gravity in the drying tank 4, and each is rotatably disposed, and each has a circumferential range of 360 degrees when viewed from a plane. In a drying apparatus comprising a plurality of base blades 5a defined to have an inner length, each of the base blades 5a has a flat surface 8 formed in an elongated shape along the heat transfer surface 2; In order to form a clearance U between the outer peripheral end 10a of the elongated flat surface 8 and the heat transfer surface 2 along the heat transfer surface 2, a clearance U for allowing rotation of each base blade 5a is formed. Slender flat surface 8 along hot surface 2
Is formed in an arc shape along the cylindrical shape of the heat transfer surface 2, and the flat surface 8 extends from one end 18 to the other end 19 in a direction opposite to the rotation direction R. During the rotation of each base blade 5a, the material to be dried is moved from one end 18 side to the other end 19 by the flat surface 8 of each base blade 5a. The drying device is characterized in that each base blade 5a is wound upward and pressed against the heat transfer surface 2 to be dried by a function of moving the heat transfer member and a function of pressing the heat transfer surface 2 side by centrifugal force.

Another feature is that the plurality of base blades 5a are arranged in multiple stages at intervals along the direction of gravity of the rotating shaft.

[0014]

According to the above construction, by rotating the plurality of base blades 5a, the material 3 to be dried is wound up by the elongated flat surface 8 along the heat transfer surface 2 of the base blade 5a together with the base blade 5a. Since it is pressed against the heat surface 2 and dried, even if the material 3 to be dried has a strong viscosity, it does not easily adhere to the base blade 5a or the heat transfer surface 2, and even if it adheres, the plurality of materials 3 The base blades 5a raise the entirety of the heat transfer surface 2 so that the material to be dried 3 does not stagnate.

Further, since each of the plurality of base blades 5a has a length within a circumferential range of 360 degrees when viewed from a plane and is independent, the outer peripheral end 10a of the flat surface 8 of each base blade 5a is provided. The clearance U between the heat transfer surface 2 and the plurality of base blades 5a
If the foreign matter enters the clearance U, it escapes immediately, and the penetration does not continue even if the foreign matter enters the clearance U because it is not connected because it is not connected and connected.

Further, the plurality of base blades 5a provide
The object 3 to be dried located at the bottom of the drying tank 4 can be wound up and raised for each of the plurality of base blades 5a. The amount of the dried object 3 that rises is large, and the object 3 to be dried is easily brought into contact with the heat transfer surface 2 at an early stage.

Further, while the material 3 to be dried is rolled up by the base blades 5a and pressed against the heat transfer surface 2, the material 3 to be dried which has been wound up earlier is pushed upward by the material 3 to be rolled up later. By continuously raising the object to be dried 3, the object to be dried 3 rises over the entire surface of the heat transfer surface 2, and the object to be dried 3 can be dried using the entire surface of the heat transfer surface 2. .

Also, by rotating the base blade 5a, the object 3 to be dried is rolled up and pressed against the heat transfer surface 2 to be dried, thereby increasing the rotation speed of the base blade 5a to thereby remove the object 2 to be dried. It is possible to press the heat transfer surface 2 more strongly. As a result, the object to be dried 3 is further wound up along the heat transfer surface, spreads in a thin film over the entire surface of the heat transfer surface 2, and heat is easily transmitted to the object to be dried 3.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 5 show a first embodiment, 4 is a cylindrical drying tank, and a cylindrical inner wall is formed as a heat transfer surface 2 for transferring heat from the heat transfer means to the object 3 to be dried. I have. The heat transfer means includes a jacket 6 formed around the drying tank 4.
And a boiler (not shown) connected to the jacket 6 and for feeding steam 7 into the jacket 6. The jacket 6 is provided with a steam inlet 11 for guiding the steam 7 into the jacket 6 and a steam outlet 12 for discharging the steam 7 out of the jacket 6.

A drying object supply pipe 13 is connected to a wall surface of the bottom 4a of the drying tank 4 to feed the drying object 3 from a drying object charging tank (not shown) to the supply screw 1.
By 4, it is supplied to the bottom 4 a in the drying tank 4. In addition, a dry matter lead-out pipe 15 is continuously provided on the wall surface of the upper part 4b,
The material 3 to be dried, which has been raised while being dried in the drying tank 4, is led out to a dry matter accumulation tank (not shown) outside the drying tank 4 by a lead screw 16.

Next, a plurality of base blades 5a are provided at the bottom 4a of the drying tank 4. The plurality of base blades 5a
Is shown as a rotary winding blade 5 here,
The motor 1 attached to the outside of the drying tank 4 bottom 4a
7, and the motor 17 rotates the rotating shaft 5b.
Can be rotated about the center.

Next, attention is paid to the plurality of base blades 5a.
The plurality of base blades 5a are formed of three base blades 5a in this example. Each base blade 5a has the same shape,
Each of the base blades 5a is defined to have a length within a 360 ° circumferential range when viewed from a plane. Each of the plurality of base blades 5a has one end 18 and the other end 19 for moving the object to be dried from one side to the other side. And this one end 1
8 is formed between the other end portion 19 and the heat transfer surface 2 and has an elongated flat surface 8. In addition, the heat transfer surface 2
The heat transfer surface 2 is formed so that a clearance U for allowing rotation of each base blade 5a is formed between the outer peripheral end 10a of the elongated flat surface 8 and the heat transfer surface 2 along the line. The outer peripheral end 10 a of the flat surface 8 having an elongated shape is formed in an arc shape along the cylindrical shape of the heat transfer surface 2. Further, the flat surface 8 is formed so as to extend obliquely upward from one end 18 to the other end 19 in a direction opposite to the rotation direction R, and the material to be dried is rotated during rotation of each base blade 5a. Is wound up above each base blade 5a for each base blade 5a by the action of being moved from one end 18 side to the other end 19 side of each base blade 5a and the action of centrifugal force on the heat transfer surface 2 side. It is configured to be pressed against the heat transfer surface 2.

Further, the base blade 5a is 36
Having a length within the circumferential range of 0 degrees means that the angle about the rotation center point from one end 18 to the other end 19 is 360 degrees or less, but one end of the base blade 5a. 18 is continuous with the scraping section 20 fixed to the rotating shaft 5b.

As another example of the heat transfer means comprising the jacket 6 and the boiler, a heat transfer means comprising the jacket 6, a heat medium contained in the jacket 6, and an electric heater disposed on the outer periphery of the jacket 6. Can be considered. That is,
The heat from the electric heater is transmitted to the heat transfer surface 2 via the heat medium. Further, as another example, a heat transfer means including an electric heater disposed on the outer periphery of the drying tank 4 can be considered.
The heat of the electric heater is transmitted to the heat transfer surface 2.

Next, the operation of the drying device 1 will be described. First, the supply screw 14 in the drying material supply pipe 13 is driven to load the drying object 3 into the drying tank 4 from the drying object charging tank. Then, the motor 17 is driven,
Each base blade 5a of the rotary winding blade 5 is rotated. At the same time, the boiler is driven to guide the steam 7 into the jacket 6 and heat the heat transfer surface 2.

Then, the base blade 5a of the rotary winding blade 5
Due to the rotation, the object to be dried 3 is placed on the flat surface 8 of the base blade 5a from one end 18 thereof and moves toward the other end 19 along the base blade 5a for each base blade 5a. At this time,
The object 3 to be dried has an elongated shape along the heat transfer surface 2 of each of the base blades 5a, and the flat surface 8 that extends obliquely upward from one end 18 to the other end 19 acts upward. As a result, the material to be dried 3 is wound up and pressed against the heat transfer surface 2 by the centrifugal force P while being wound up. This will be described in more detail. The flat surface 8 of each of the base blades 5a that applies a hoisting action to the object 3 to be dried and presses the heat transfer surface 2 by centrifugal force has an elongated shape along the heat transfer surface 2. And the outer peripheral end 10a of the flat surface 8
Is formed in an arc shape along the heat transfer surface 2 so that the object to be dried 3 is not simply given an impact.
This effectively performs a winding operation on the heat transfer surface and a pressing operation on the heat transfer surface 2. And the thing to be dried is not moved in the drying device by one connected blade,
The object to be dried is wound up by each of the plurality of base blades 5 a and pressed against the heat transfer surface 2. For this reason, even if the dried material 3 or the like has a high viscosity, it does not adhere to the heat transfer surface 2, and the dried object does not stay at a specific location on the heat transfer surface 2. Further, since each of the plurality of base blades 5a has only a length within a circumferential range of 360 degrees when viewed from a plane and is independent, the outer peripheral end 10 of the flat surface 8 of each of the base blades 5a described above.
Since the clearance U between the a and the heat transfer surface 2 is not connected to all the blades, even if foreign matter in the material to be dried 3 enters the clearance, the clearance U immediately escapes and does not continue. Moreover, since the to-be-dried material 3 located in the inner bottom of the drying tank 4 can be hoisted and raised for each of the plurality of base blades 5a by the plurality of base blades 5a, the inner bottom of the drying tank 4 The amount of the object to be dried 3 that is elevated relative to the total amount of the object to be dried 3 is large, and the object to be dried 3 is easily brought into contact with the heat transfer surface 2 at an early stage. In addition, by each of the base blades 5a,
Pressing the dried object 3 against the heat transfer surface 2 while rolling up the object 3,
The object to be dried 3 is pushed up by the object to be dried 3 to be rolled up later, and the object to be dried 3 is raised continuously by raising the object to be dried 3 continuously. Then, the object to be dried 3 can be dried using the entire surface of the heat transfer surface 2. In addition, by rotating the base blade 5a, the object 3 to be dried is rolled up, pressed against the heat transfer surface 2 and dried, and the rotation speed of the base blade 5a is increased to transfer the object 3 more strongly. It can be pressed against the hot surface 2. As a result, the object to be dried 3 is further wound up along the heat transfer surface, spreads in a thin film over the entire surface of the heat transfer surface 2, and heat is easily transmitted to the object to be dried 3.

The object 3 to be dried pressed against the heat transfer surface 2
Has a surface that contacts the heat transfer surface 2 on one side,
On the other side, there is an evaporation surface F that comes into contact with the air in the space A in the drying tank 4. The object 3 to be dried 3 contacting the heat transfer surface 2
In this case, a certain amount of moisture evaporation occurs on the spot due to heat from the heat transfer surface 2. The dried object 3 having a low water content due to the evaporation of water at the time of contact with the heat transfer surface 2 is the dried object 3 having a high moisture content.
And moves to the evaporation surface F. The material 3 to be dried that has moved to the evaporation surface F is further exposed to the air in the space A, so that the evaporation of water proceeds further.

The object to be dried 3 moves from the heat transfer surface 2 side to the evaporation surface F, and at the same time, the object to be dried 3 which is wound up later by the above-mentioned winding up by the respective base blades 5a is the material 3 to be dried up earlier. Is pressed intermittently, and the object 3 to be dried rises along the heat transfer surface 2. That is, the above-mentioned dried material 3
Rises and rises along the heat transfer surface 2 while moving from the heat transfer surface 2 to the evaporation surface F.

Next, the flow of the material 3 to be dried near each of the base blades 5a will be described when viewed from the side. When the base blade 5a rotates, the object 3 to be dried is wound up by the respective base blades 5a, and as a result, the object 3 to be dried is wound up. At this time, attention is paid to the movement of the object 3 to be dried in the vicinity of two base blades 5a among the plurality of base blades 5a.

That is, of the two base blades 5a, the material to be dried 3 located above the base blade 5a located upstream in the rotation direction R is projected obliquely upward from the upstream base blade 5a. Try to go down by its weight. On the other hand, the material to be dried 3 located above the base blade 5a located on the downstream side is about to jump obliquely upward from the base blade 5a on the downstream side. In other words, a portion where the flows of the two objects to be dried 3 overlap is generated, and a turbulent flow occurs at the overlapping portion.

In the turbulent flow region, the flow of the material to be dried 3 is strong, and at the same time, the contact speed with the heat transfer surface 2 is increased. The number of occurrences of the turbulent flow region increases as the rotation speed and the rotation speed of the base blade 5a of the rotary winding blade 5 increase. In addition, by increasing the number of the base blades 5a, the number of generated locations is increased, and the contact speed of the dried object 3 with the heat transfer surface 2 is increased.

That is, by forming the turbulent flow region, the object to be dried 3 transmits not only a contact having a certain contact speed due to rotation at the time of winding up but also a contact having a certain contact speed due to turbulent flow. This is performed on the heating surface 2, and the object 3 to be dried 3 is more likely to come into contact with the heat transfer surface 2 due to the synergistic effect of the two contacts, and heat is more easily transmitted from the heat transfer surface 2 to the object 3 to be dried.

Then, the dried material 3 which rises along the heat transfer surface 2 and is dried is guided into the dried material outlet pipe 15 by driving the lead screw 16, and the dried material accumulating tank outside the drying tank 4. Carry on.

In the operation of supplying the object to be dried 3 into the drying tank 4 and drying it in the drying tank 4, the dried substance is obtained by:
The supply of the object to be dried 4 may be divided so as to obtain a dried object intermittently. Alternatively, the object to be dried 3 may be continuously supplied, and the dried object may be continuously collected to obtain a dried object. Alternatively, a dried product may be obtained.

Next, a second embodiment will be described with reference to FIGS. 6 and 7. This embodiment shows an example in which the number of the base blades 5a is changed from three to four.

Next, a third embodiment will be described with reference to FIG. In this example, the number of the base blades 5a is two. The plurality of base blades 5a are mounted in multiple stages on a central rotating shaft 21 vertically arranged along the direction of gravity in the drying tank 4.

The operation of the drying apparatus 1 in which the base blades 5a are arranged in multiple stages along the rotation axis along the direction of gravity will be described.
By rotating the multi-stage base blades 5a, the material 3 to be dried located at the bottom 4a of the drying tank 4 is wound up by the lowermost base blades 5a. Then, the object 3 to be dried, which has risen while being dried along the heat transfer surface 2, is wound up again by the base blades 5a in the upper stage. In this manner, the dried object 3 pressed against the heat transfer surface 2 and dried while being sequentially wound up by the base blades 5a of each stage is wound up by the highest-grade base blade 5a, and then a dried product is obtained. That is, the object 3 to be dried is
And rises continuously while being dried from the bottom 4a to the top 4b.

Next, a fourth embodiment will be described with reference to FIG. In this example, the circumference of one disk is cut out, and the cut-out portion is raised to form the plurality of base blades 5a. Then, one of the plurality of base blades 5a
The two rotary winding blades 5 are fixed to the central rotation shaft 21.

Next, a fifth embodiment will be described with reference to FIG. In this example, the plurality of base blades 5a are fixed to the central rotating shaft 21 so as to be two steps above and below. Of these, the lower plurality of base blades 5a are formed by cutting out the circumferential portion of the disk shown in the fourth embodiment. On the other hand, the upper stage base blade 5a is formed by cutting out the circumferential portion of the hollow disk and raising the cutout portion. The upper base blade 5 a is fixed to the center rotation shaft 21 by a mounting arm 22. When the center rotating shaft 21 is rotated, the object 3 to be dried 3 continuously rises from the base blade 5a of the lower rotary hoisting blade 5 to the base blade 5a of the upper rotary hoisting blade 5.

Next, a sixth embodiment will be described with reference to FIG. In this example, a plurality of base blades 5a in which the circumferential portion of the above-mentioned hollow disk is cut away are further fixed to the central rotation shaft 21 in multiple stages. When the plurality of base blades 5a are rotated, the object 3 to be dried rises from the lowermost base blade 5a to the uppermost base blade 5a.

[0041]

As described in detail above, the invention according to the first aspect is characterized in that the object to be dried is rolled up by each of the plurality of base blades, pressed against the heat transfer surface and moved from the heat transfer surface to the evaporation surface, Can be continuously raised along, whereby the dried matter has a lower moisture content as it rises,
Dry matter can be obtained at the top of the drying tank,
In particular, since the material to be dried is rolled up for each base blade and pressed against the heat transfer surface and dried, it is difficult for the viscous material to be dried to adhere to the blade or heat transfer surface even if it is strong. Also, since the object to be dried is entirely raised over the entire heat transfer surface, the object to be dried does not stagnate. The flat surface of each of the base blades that applies a winding action to the object to be dried 3 and presses the heat transfer surface by centrifugal force has an elongated shape along the heat transfer surface, and has one end to the other end. Because it extends obliquely upward toward the object, it does not merely apply an impact to the object to be dried, but effectively performs a winding action on the object to be dried and a pressing action on the heat transfer surface.

Further, since each of the plurality of base blades has a length within a circumferential range of 360 degrees when viewed from the plane and is independent, the outer peripheral end of the flat surface of each of the base blades and the heat transfer surface Is not continuous over all the blades, so that the foreign matter in the material to be dried does not get into the clearance.

Further, the plurality of base blades can raise the object to be dried located at the bottom of the drying tank with the plurality of base blades, and the total amount of the object to be dried located at the bottom of the drying tank can be increased. Therefore, the amount of the material to be dried is increased as compared with the above, and the material to be dried is easily brought into contact with the heat transfer surface at an early stage, so that the drying efficiency is easily improved.

Further, while the material to be dried is wound up by a plurality of base blades, the material to be dried is pressed against the heat transfer surface, and the material to be dried which has been wound up later is pushed upward by the material to be wound up later, so that the material to be dried is continuously heated. By raising the object, the object to be dried rises over the entire surface of the heat transfer surface, and the object to be dried can be dried using the entire surface of the heat transfer surface. It can be used for

In addition, by rotating the plurality of base blades, the object to be dried is rolled up and pressed against the heat transfer surface to be dried. Therefore, the rotation speed of the base blade is increased to transfer the object to be dried more strongly. Can be pressed against hot surfaces. As a result, the object to be dried further rises along the heat transfer surface, spreads in a thin film over the entire surface of the heat transfer surface, heat is easily transmitted to the object to be dried, and drying efficiency is improved.

According to the second aspect of the present invention, by forming a plurality of base blades at a plurality of intervals at intervals, the above-described various effects can be better exhibited over the entire area of the plurality of stages.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal side view of a drying apparatus shown in a first embodiment of the present invention.

FIG. 2 is a plan view of a base blade of the drying device shown in the first embodiment of the present invention.

FIG. 3 is a side view of a base blade of the drying device shown in the first embodiment of the present invention.

FIG. 4 is a diagram showing a use state of the drying device shown in the first embodiment of the present invention.

FIG. 5 is an enlarged view showing a state of an object to be dried when the drying apparatus shown in the first embodiment of the present invention is used.

FIG. 6 is a plan view of a base blade of the drying device shown in the second embodiment of the present invention.

FIG. 7 is a side view of a base blade of the drying device shown in the second embodiment of the present invention.

FIG. 8 is a diagram showing a use state of the drying device shown in the third embodiment of the present invention.

FIG. 9 is a partial sectional perspective view of a drying apparatus shown in a fourth embodiment of the present invention.

FIG. 10 is a partial sectional perspective view of a drying apparatus shown in a fifth embodiment of the present invention.

FIG. 11 is a partial sectional perspective view of a drying apparatus shown in a sixth embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drying device 2 heat transfer surface 3 object to be dried 4 drying tank 5 a base blade 8 flat surface U clearance R rotation direction of base blade A space F evaporation surface

Claims (2)

(57) [Claims] 1. A drying tank 4 into which an object to be dried 3 is charged, and a heat transfer surface 2 on a cylindrical inner wall surface of the drying tank 4 for transferring heat from a heat transfer means to the object to be dried 3. , The drying tank 4
And a heat transfer means for transferring heat to the heat transfer surface 2 and a rotating shaft arranged along the direction of gravity in the drying tank 4 so as to be rotatable. In a drying apparatus comprising a plurality of base blades 5a each having a length within a circumferential range of 360 degrees as viewed from a plane, each of the base blades 5a extends along the heat transfer surface 2. A flat surface 8 formed in an elongated shape, and along the heat transfer surface 2, between the outer peripheral end 10 a of the elongated flat surface 8 and the heat transfer surface 2.
The outer peripheral end 10a of the elongated flat surface 8 extends along the cylindrical shape of the heat transfer surface 2 along the heat transfer surface 2 so that a clearance U for allowing the rotation of each base blade 5a is formed. The flat surface 8 is formed in an arc shape, and the flat surface 8 extends from one end 18 to the other end 1 in a direction opposite to the rotation direction R.
During the rotation of each base blade 5a, the material to be dried is covered from the one end 18 side by the flat surface 8 of each base blade 5a to the other end 19 side. A drying device characterized in that the dried material is pressed against the heat transfer surface 2 while being rolled up for each of the base blades 5a and dried by the action of moving the dried material and the action of pressing the heat transfer surface 2 by centrifugal force. 2. The drying apparatus according to claim 1, wherein the plurality of base blades are arranged in multiple stages at intervals along the direction of gravity of the rotating shaft.