JP5697488B2 - Air dryer - Google Patents

Description

  The present invention relates to an airflow drying device that swirls and drys an object to be dried with hot air.

  Conventionally, as this type of airflow drying apparatus, as shown in Patent Document 1 below, an apparatus is known in which a large number of balls are thrown together with a heated object at the bottom of a drying chamber into which the dried object is charged. According to the apparatus described in Patent Document 1, drying is promoted by pulverizing an object to be dried with a ball.

  Moreover, as shown in the following Patent Document 2, there is known an apparatus in which a rotary blade is provided at the bottom of a drying chamber into which an object to be dried is charged. According to such an apparatus described in Patent Document 2, the rotating blades assist the swirling with hot air to promote drying of an object to be dried.

JP 2001-133150 A JP 2006-266552 A

  However, the devices described in Patent Documents 1 and 2 are intended to completely dry a material to be dried and move it to a separate chamber to collect the dried material. There is an inconvenience that it cannot be separated and taken out.

  Here, it is conceivable to take out the dried product from the drying chamber with the apparatuses described in Patent Documents 1 and 2, but there are balls and rotor blades in the lower portion of the drying chamber, and it is difficult to take out the dried product with a large specific gravity. On the other hand, in order to take out a dried product having a large specific gravity, a ball or a rotary blade cannot be disposed in the lower part of the drying chamber, and it becomes difficult to completely dry the product to be dried by pulverization or the like.

  Then, an object of this invention is to provide the airflow drying apparatus which can separate and take out the dried material from which specific gravity is dried by drying a to-be-dried material in view of the above situation.

The airflow drying apparatus of the first invention is
A cylindrical first drying chamber arranged vertically, an inverted conical second drying chamber communicating with the first drying chamber on the upper side, and an object to be dried in the first drying chamber at a predetermined ratio A hot air generator for generating hot air to be supplied into the first drying chamber; and temperature detecting means for detecting the temperature in the first drying chamber; The to-be-dried material thrown in by the charging device is swirled by the hot air supplied to the charging device, and among the dried to-be-dried materials, the first dried material having a large specific gravity is placed in the first drying chamber. An airflow drying device that collects from the drying chamber and moves the second dried material having a small specific gravity to the second drying chamber and collects it from the second drying chamber,
The first drying chamber has a straight cylindrical shape, and includes a bottom surface composed of a reversible butterfly damper, a plurality of hot air supply ports arranged so as to be blown onto the bottom surface, and the bottom surface into the first drying chamber. A cone-shaped cone projecting toward the
At the timing when the detected temperature reaches a first temperature to begin the drying of the material to be dried in the temperature detecting means by the pre-Symbol hot air generator, starting the supply to the first drying chamber of the material to be dried by the feeding device while, at the timing when the detected temperature by the introduced becomes the second temperature is a threshold temperature decreases of該被dried product, to stop the supply to the first drying chamber of the material to be dried by-projecting inserting apparatus the material to be dried already turned dried, characterized Rukoto by inverting the bottom surface at a timing when the drying is finished.

  According to the airflow drying apparatus of the first invention, the input of the material to be dried to the first drying chamber is controlled as follows based on the temperature in the first drying chamber.

  That is, when the temperature of the first drying chamber becomes the first temperature that is the start temperature of the material to be dried by the hot air supplied from the hot air generator, the material to be dried is fed into the first drying chamber at a predetermined rate by the charging device. Start throwing. Thereby, a lump of the material to be dried is formed in the first drying chamber, and the lump is not crushed and it is possible to avoid remaining at the bottom of the first drying chamber without being sufficiently dried.

  Furthermore, the temperature of the first drying chamber gradually decreases due to the heat absorbed by the material to be dried and the heat of vaporization at the time of drying when the material to be dried is put into the first drying chamber, but the temperature in the first drying chamber is the threshold temperature. By stopping charging of the object to be dried into the first drying chamber at a certain second temperature, the first drying chamber can be maintained at a temperature suitable for drying the object to be dried. Therefore, the object to be dried can be reliably dried in the first drying chamber without a ball, a rotor blade, or the like in the lower part of the drying chamber, and the dried material having a large specific gravity staying in the first drying chamber, It is possible to separate and separate the dried product having a small specific gravity that moves to the drying chamber.

  Thus, according to the airflow drying apparatus of 1st invention, a to-be-dried material can be dried and the dried material from which specific gravity differs can be isolate | separated and taken out.

The airflow drying apparatus of the second invention is the first invention,
After stopping the input of the object to be dried by the input device, the drying of the object to be dried is finished at a timing when the rate of increase in the temperature detected by the temperature detecting means exceeds a predetermined threshold.

  According to the airflow drying apparatus of the second aspect of the invention, the temperature in the first drying chamber rises due to the hot air introduced into the first drying chamber by stopping the charging of the material to be dried into the first drying chamber. The rate of temperature increase is increased by the end of drying of the object to be dried and the elimination of heat absorption and heat of vaporization by the object to be dried. Therefore, by drying the material to be dried at a timing when the rate of temperature increase in the first drying chamber exceeds a predetermined threshold, the material to be dried is reliably and efficiently dried to separate the dried materials having different specific gravities. Can be taken out.

  In addition, in order to complete | finish drying of to-be-dried material, in addition to complete | finishing drying of to-be-dried material by interrupting | blocking the hot air introduce | transduced into a 1st drying chamber from a hot air generator, for example, 1st drying chamber And taking out a dried product having a large specific gravity from the first drying chamber, and taking out a dried product having a low specific gravity from the second drying chamber.

The airflow drying device of the third invention is the first invention,
After stopping the charging of the material to be dried by the charging device, the temperature detected by the temperature detecting means is a third temperature that is greater than the second temperature and equal to or less than the first temperature at which the material to be dried is in a dry state. The drying of the object to be dried is finished at the timing.

  According to the airflow drying apparatus of the third aspect of the invention, the temperature in the first drying chamber rises due to the hot air introduced into the first drying chamber by stopping the charging of the material to be dried into the first drying chamber. And drying of a to-be-dried material is complete | finished at the timing when the temperature in a 1st drying chamber became 3rd temperature which is completion | finish of drying. Thereby, it can be determined easily whether the to-be-dried object dries, and the to-be-dried object can be dried reliably and without waste, and the dried objects with different specific gravity can be separated and taken out.

The system block diagram which shows the whole structure of the airflow drying apparatus of this invention. II-II sectional view taken on the line in FIG. Explanatory drawing which shows the structure of a bottom part. The time chart which shows the drying process of to-be-dried material.

  As shown in FIG. 1, the airflow drying apparatus of the present embodiment uses, for example, any one of bonito, tea leaves, okara, egg shells, and the like to be dried, and the drying objects are swirled and dried by hot air. An apparatus for collecting an object, which includes a first drying chamber 10, a second drying chamber 20, a material to be dried 30, a hot air generator 40, and a controller 50.

  The first drying chamber 10 is a cylindrical drying chamber arranged in a vertical direction, and a transfer port 11 is provided on the upper side surface of the first drying chamber 10 for moving the dried product to the second drying chamber 20. . A hot air inlet 12 into which hot air supplied from the hot air generator 40 is introduced is provided on the lower side surface of the first drying chamber 10. Further, a supply port 13 for an object to be dried for supplying the first drying chamber 10 from the charging device 30 into the first drying chamber 10 is provided on the side surface of the first drying chamber 10.

  A box-shaped first recovery unit 15 is provided at the lower portion of the first drying chamber 10 to store a dried product with a large specific gravity recovered from the bottom 14 side of the first drying chamber 10. A handle (not shown) is attached to the first recovery unit 15 so that only the first recovery unit 15 is pulled out from the casing.

  The second drying chamber 20 is an inverted conical drying chamber, and a connection receiving port 21 connected to the transfer port 11 of the first drying chamber 10 is provided on the upper side surface thereof. Further, a discharge cylinder 22 projects from the ceiling of the second drying chamber 20 toward the inside thereof.

  Below the second drying chamber 20, a box-shaped second recovery unit 25 is provided for storing dry matter having a small specific gravity recovered from the bottom 24 side of the second drying chamber 20. A handle (not shown) is attached to the second recovery unit 25 so that only the second recovery unit 25 is pulled out from the casing.

  The charging device 30 is squeezed with a taper shape on the lower side of a box-shaped main body 31 in which an object to be dried is stored, and a screw conveyor 32 is provided at the lower part. On the other hand, the upper side of the main body 31 is an opening, and an upper cover (not shown) is provided in the opening.

  One end of the screw conveyor 32 is provided with a motor 33 via a speed reducer, and the other end is disposed so as to face the supply port 13 of the object to be dried in the first drying chamber 10. Then, when the driving force of the motor 33 is transmitted to the screw conveyor 32 via the speed reducer, the material to be dried stored in the main body 31 falls to the screw conveyor 32 side by its own weight and is stirred by the screw conveyor 32. However, it is supplied into the first drying chamber 10.

  At this time, by changing the rotation speed of the motor 33, the object to be dried can be controlled to a desired speed, that is, a desired supply amount per unit time.

  The hot air generating device 40 is a device that heats the air supplied from the circulation fan 60 and supplies the air into the first drying chamber. The hot air generator 40 includes a plurality of electric heaters inside the cylinder and is supplied from the circulation fan 60 on the upper side. The air introduction port 41 for introducing the heated air and the heated air supply port 42 for supplying the heated air heated by the electric heater are provided.

  The control device 50 is provided in the first drying chamber 10 to detect the temperature in the first drying chamber 10 (corresponding to the temperature detecting means of the present invention), and the hot air generator 40 is heated. The temperature detected by the hot air temperature sensor 72 provided at the air supply port 42 and detecting the temperature of the heated air is input.

  Furthermore, the control device 50 controls the start and end of drying of the object to be dried in the first drying chamber 10 based on the detected temperature. More specifically, the control device 50 controls the input device 30 mainly based on the temperature detected by the first temperature sensor 71 to input an object to be dried into the first drying chamber 10 and the hot air generator 40. And the output of the circulation fan 60 is controlled. Further, the control device 50 determines that the drying of the object to be dried is completed, and performs a predetermined process.

  Note that the control device 50 is provided with a liquid crystal display panel or a lamp indicating an operating state, as necessary.

  Here, the first drying chamber 10 and the second drying chamber 20 are connected by a transfer duct 81 between the transfer port 11 of the first drying chamber 10 and the connection receiving port 21 of the second drying chamber 20. The drying chamber 20 and the circulation fan 60 are connected by an exhaust duct 82 between the discharge cylinder 22 of the second drying chamber 20 and the intake port (not shown) of the circulation fan 60.

  Further, the circulation fan 60 and the hot air generator 40 are connected to the supply port 61 of the circulation fan 60 and the air inlet 41 of the hot air generator 40 by an air supply duct 83, so that the hot air generator 40 and the first drying chamber 10 are connected. The hot air supply port 42 of the hot air generator 40 and the hot air introduction port 12 of the first drying chamber 10 are connected by a hot air supply duct 84.

  Next, a configuration for supplying hot air to the first drying chamber 10 will be described with reference to FIG.

  Hot air, which is heated air supplied from the hot air generator 40, is distributed in a plurality of hot air supply ports 16, 16,... So as to blow from the hot air inlet 12 into the first drying chamber 10 in the tangential direction. Is supplied into the first drying chamber 10.

  In this way, a plurality of hot air supply ports 16 are arranged in a distributed manner so that hot air supplied from the hot air generator is blown from the tangential direction of the lower peripheral wall of the first drying chamber 10. A swirling flow can be generated.

  Next, the configuration of the bottom 14 of the first drying chamber 10 will be described with reference to FIG.

  As shown in FIG. 3A, the bottom portion 14 has a bottom damper 14 a that is a butterfly damper, and a cone-shaped cone portion 14 b is provided from the bottom surface 14 a toward the inside of the first drying chamber 10. . Further, the bottom surface 14a is provided with a damper drive motor 14c on a rotating shaft that pivotally supports the bottom surface 14a in the radial direction (due to the structure of the butterfly damper). As shown in FIG. The bottom surface 14a can be rotated halfway.

  Moreover, also about the 2nd drying chamber 20, the bottom face 24a of the bottom part 24 is a butterfly damper, and can be half-rotated by the damper drive motor 24c.

  The damper drive motor 14c at the bottom 14 and the damper drive motor 24c at the bottom 24 are both connected to the control device 50, and the damper is opened and closed by a control signal from the control device 50.

  A method for drying an object to be dried by the airflow drying apparatus configured as described above will be described with reference to FIGS. 1 and 4.

  First, when drying an object to be dried, the top cover of the input device 30 is removed and the object to be dried is put into the main body 31. The material to be dried is, for example, any one of bonito, tea leaves, okara, egg shell, and the like, and when this is put into the main body 31, the material to be dried moves to the screw conveyor 32 side by its own weight, and the motor 33 By driving, it becomes possible to put the material to be dried into the first drying chamber 10 by the screw conveyor 32 at any time.

Next, the control device 50 operates the hot air generator 40 and the circulation fan 60 to start supplying hot air to the first drying chamber 10. Specifically, hot air at a constant flow rate per unit time is supplied to the first drying chamber 10 from time t _{0 in} FIG.

  When the temperature in the first drying chamber 10 rises and the temperature detected by the first temperature sensor 71 reaches the first temperature that is the drying start temperature of the object to be dried, the control device 50 causes the charging device 30 to The motor 33 is driven and a predetermined amount of material to be dried per unit time is put into the first drying chamber 10 by the screw conveyor 32. Specifically, when the temperature in the first drying chamber reaches a first temperature (for example, 200 ° C.) at which drying starts at time t1 in FIG. 4, the material to be dried is placed in the first drying chamber by the input device 30 at that timing. 10 in.

  Here, the first temperature is a temperature determined according to the object to be dried, and is lower than the temperature at which the object to be burnt is burned, and is higher than the second temperature that is the lower limit temperature threshold when drying the object to be dried. It is arbitrarily set within the range.

  The dry matter thrown into the first drying chamber 10 is supplied from the hot air generator 40, and the bottom portion 14 of the first drying chamber 10 is caused by the swirling flow of hot air blown from the hot air supply ports 16, 16,. The powder is crushed while being rolled and dried from the surface, soars into the first drying chamber 10 and floats.

  For this reason, if the feeding speed of the material to be dried into the first drying chamber 10 is increased too much, the material to be dried can accumulate at the bottom 14 of the first drying chamber 10. Therefore, the material to be dried is put into the first drying chamber 10 at an appropriate charging speed based on the viscosity of the material to be dried, the amount of moisture, and the like.

Next, when the temperature in the first drying chamber 10 decreases due to the input of the material to be dried into the first drying chamber 10, the control device 50 determines that the temperature detected by the first temperature sensor 71 is the lower limit threshold temperature. At the timing when the temperature is reached, the driving of the motor 33 is stopped, and the charging of the material to be dried into the first drying chamber 10 is stopped. Specifically, at time t _2, the temperature detected by the first temperature sensor 71 at the timing when a second temperature (e.g., 0.99 ° C.), to stop the supply to the first drying chamber 10 of the material to be dried.

  When charging of the material to be dried into the first drying chamber 10 is stopped, the temperature in the first drying chamber 10 starts to rise again. And if the temperature of the 1st drying chamber 10 rises to 3rd temperature, the control apparatus 50 will drive the damper drive motor 14c, and will half-rotate the bottom face 14a.

  Here, the third temperature is the temperature in the first drying chamber 10 when all the objects to be dried put into the first drying chamber 10 are dried, and the objects to be dried depend on the objects to be dried. The temperature is set higher than the second temperature and lower than the first temperature so as not to burn.

Specifically, at time _{t 3,} at the timing when the temperature detected by the first temperature sensor 71 becomes a third temperature (e.g., 195 ° C.), the control unit 50, the bottom surface 14a by driving the damper drive motor 14c and 24c And 24a are rotated 90 degrees halfway.

  In the first drying chamber 10, when the bottom surface 14a is half-turned by the damper driving motor 14c, the cone portion 14b is turned sideways, and the hot air supplied from the hot air supply port comes into contact with the half-turned bottom surface. The swirling flow in the chamber 10 is lost. Therefore, the dry matter having a relatively large specific gravity, which has been swirling in the first drying chamber 10, falls to the lower side of the first drying chamber 10, passes through the bottom surface 14 a in a state of rising halfway. And stored in the first recovery unit 15.

  Similarly, in the second drying chamber 20, when the bottom surface 24a is half-turned by the damper drive motor 24c, the dry matter having a relatively low specific gravity that has accumulated on the bottom surface 24a or floated in the second drying chamber 20 is 2 Drops to the lower side of the drying chamber 20, passes through the bottom surface 24 a in a state of rising halfway, and is accommodated in the second recovery unit 25.

Then, the control unit 50, the time t ₄ after the predetermined period of time that drying of the first drying chamber 10 and the second drying chamber 20 is accommodated to fall into the first collecting unit 15 and the second recovery unit 25 Then, the damper drive motors 14c and 24c are driven to turn the bottom surfaces 14a and 24a by 90 degrees in the reverse direction, thereby closing the bottom surfaces 14a and 24a.

  Next, after the bottom surfaces 14a and 24a are closed, the control device 50 again puts an object to be dried into the first drying chamber 10 via the charging device 30 at the timing when the temperature of the first drying chamber 10 becomes the first temperature again. The next material to be dried is dried. Hereinafter, the material to be dried can be continuously dried in the same cycle, and the dried material having a large specific gravity and the dried material having a small specific gravity can be separated and recovered.

  As described above in detail, according to the airflow drying apparatus of the present embodiment, it is possible to dry an object to be dried and to separate and take out dried substances having different specific gravities.

  In the present embodiment, after the charging of the material to be dried to the first drying chamber 10 is stopped, the first and second temperatures are increased at the timing when the temperature in the first drying chamber 10 rises again to the third temperature. Although the dry matter in the 2nd drying chambers 10 and 20 is carried out to the 1st and 2nd collection parts 15 and 25, it is not limited to this.

  For example, after the input device 30 stops the input of the object to be dried, the object to be dried input to the first drying chamber 10 is dried based on the change in temperature rise (change rate) in the first drying chamber 10. You may detect what happened. Specifically, as the drying of the material to be dried proceeds, the rate of temperature increase (per unit time) in the first drying chamber 10 increases, so the rate of temperature increase in the first drying chamber exceeds a predetermined threshold. When the drying of the object to be dried is completed at the same timing, the object to be dried can be reliably and efficiently dried to separate and take out the dried objects having different specific gravities.

  Further, in the present embodiment, the bottom surfaces 14a and 24a are half-rotated by the electric butterfly damper, but the present invention is not limited to this. For example, the bottom portions 14 and 24 are configured by a lever-type butterfly damper or the like. Then, it may be half-turned by the user. In this case, the control device 50 is provided with a liquid crystal display panel or lamp display means (not shown) that indicates the operating state, and is configured to allow the user to recognize that the drying of the object to be dried has been completed by the display means. Is done.

DESCRIPTION OF SYMBOLS 10 ... 1st drying chamber, 14 ... Bottom part, 20 ... 2nd drying chamber, 30 ... Input device, 40 ... Hot-air generator, 50 ... Control apparatus, 71 ... 1st temperature sensor (temperature detection means).

Claims (3)

A cylindrical first drying chamber arranged vertically, an inverted conical second drying chamber communicating with the first drying chamber on the upper side, and an object to be dried in the first drying chamber at a predetermined ratio A hot air generator for generating hot air to be supplied into the first drying chamber; and temperature detecting means for detecting the temperature in the first drying chamber; The to-be-dried material thrown in by the charging device is swirled by the hot air supplied to the charging device, and among the dried to-be-dried materials, the first dried material having a large specific gravity is placed in the first drying chamber. An airflow drying device that collects from the drying chamber and moves the second dried material having a small specific gravity to the second drying chamber and collects it from the second drying chamber,
The first drying chamber has a straight cylindrical shape, and includes a bottom surface composed of a reversible butterfly damper, a plurality of hot air supply ports arranged so as to be blown onto the bottom surface, and the bottom surface into the first drying chamber. A cone-shaped cone projecting toward the
At the timing when the detected temperature reaches a first temperature to begin the drying of the material to be dried in the temperature detecting means by the pre-Symbol hot air generator, starting the supply to the first drying chamber of the material to be dried by the feeding device while, at a timing when the detected temperature by the introduced becomes the second temperature is a threshold temperature decreases of該被dried product, to stop the supply to the first drying chamber of the material to be dried by-projecting inserting apparatus the material to be dried already turned dried, flash drying apparatus according to claim Rukoto by inverting the bottom surface at a timing when the drying is finished. The airflow drying device according to claim 1,
Wherein after said stop introduction of material to be dried by the dosing device, said temperature sensing means sensing the temperature rise rate is airflow drying device, which comprises terminating the drying object to be dried at the timing exceeds a predetermined threshold . The airflow drying device according to claim 1,
After stopping the charging of the material to be dried by the charging device, the drying of the material to be dried is completed at a timing when the temperature detected by the temperature detecting means becomes a third temperature that is higher than the second temperature and lower than the first temperature. An airflow drying apparatus characterized by:

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