JPS62106280A - Cereal drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a grain drying apparatus for drying grain under reduced pressure at a constant constant temperature.

BACKGROUND ART Conventionally, hot air conduction drying using hot air, radiation heat transfer drying using infrared rays, far infrared rays, etc., and high frequency heat transfer drying using high frequency waves are well known as methods for forcibly drying objects to be dried. All of these methods are heat-dependent drying methods that use heat to promote the vaporization of moisture in the material to be dried. On the other hand, vacuum drying
Drying methods, such as box drying, are also known in which water is removed by reducing the vapor pressure of water by creating a vacuum atmosphere.

Furthermore, there is also a method of drying by heating and reducing pressure using a fan that exhausts air while emitting heat, as described in, for example, Japanese Unexamined Patent Publication No. 57-19582.
An apparatus for drying grains, etc. by the above-mentioned method of drying by heating and reducing pressure may include a hollow chamber and a granule storage chamber having a mechanism for generating frictional heat under reduced pressure as described in JP-A No. 59-18344. It has been proposed that the structure is formed to allow ventilation.

Problems to be Solved by the Invention The conventional heat-dependent drying method removes moisture by heat of evaporation, so the drying method uses 539.8 ca per gram of water at 100°C.
1 of vaporization heat, a large heat source is required, and the running cost is high. Further, heat-dependent drying methods have problems not only in drying efficiency but also in drying finish.

That is, it is difficult to uniformly dry the inside and surface of the article to be dried, and the surface may become over-dried or undergo structural changes due to heating, and the surface may become hardened.

Further, although vacuum drying and freeze drying methods have relatively high drying efficiency, they require expensive equipment and are expensive, so they are currently only used for drying special products. In addition, conventional equipment that heats and depressurizes and dries using a fan that exhausts heat while emitting all of it heats up to over 40°C if the vacuum is maintained during drying in the summer, and if you try to lower the temperature, the degree of depressurization will increase. It is impossible to control the temperature and the degree of vacuum at the same time, and it cannot be satisfactorily applied to drying grains that require drying at relatively low temperatures. In conventional drying apparatuses in which the articles to be dried are dried in a stationary state in a drying chamber, sufficient ventilation is not provided between the particles, and the articles cannot be dried satisfactorily.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a grain drying device that has good drying efficiency and drying finish, is inexpensive in running cost, and is easy to operate. The purpose is to

Means for Solving the Problems Technical means for solving the above problems will be explained based on drawings corresponding to embodiments.

The present invention employs a method of providing two systems for the heat source and exhaust in the drying chamber 1, which is constructed of heat insulating material and pressure-resistant material. That is, the heat source is the cooling/heating device 9, the exhaust is performed by the exhaust system e3, and a certain amount of outside air is introduced from the inlet in order to maintain a certain amount of air pressure. Furthermore, a rotatable grain container 12 made of ventilation material such as a mesh material and a blower 11 are installed in the drying chamber 1 to keep the interior of the drying chamber in a constant constant temperature state and a constant depressurized state. Make sure to dry it under reduced pressure while moving it around.

Operation When the grain to be dried is placed in the container 12 and set in the drying chamber, the power is turned on and the drying chamber is operated, the pressure inside the drying chamber is reduced by the exhaust device 3, but when the pressure reaches a certain degree, the air from the outside air inlet is removed. It becomes a state of conflict and is maintained in that state. Further, the interior of the room is maintained at a constant temperature by a cooling/heating device 9.

As the grains in the grain container 12 move within the container, moisture is moved to the surface by reduced pressure, and the water film on the surface is scattered by the blower 11 into the indoor atmosphere. The exhaust device dehumidifies the room and always works to reduce the total humidity in the room, so that drying is carried out continuously, efficiently and uniformly.

Example Embodiments of the present invention will be described below with reference to all the drawings.

FIG. 1 is a schematic side sectional view showing an embodiment of a grain drying apparatus according to the present invention, and FIG. 2 is a side view of a grain container thereof.

In the figure, reference numeral 1 denotes a drying chamber, which is composed of an FC housing 2 made of a pressure-resistant material that can withstand reduced pressure and filled with a heat insulating material inside. Reference numeral 3 denotes an exhaust fan which is an exhaust device provided outside the housing 2 facing the internal exhaust port 4 formed in the housing 2, and the exhaust from the exhaust fan passes through the heat exchanger 8. Then, it is discharged to the outside air from the external exhaust port 5. Incidentally, the exhaust device may entirely employ a vacuum pump. On the other hand, 7 is an external intake port, and the outside air taken in from the external intake port passes through the inside of the heat exchanger 8 as shown in the figure, and then enters the internal intake port. 6. Air is taken into the drying chamber 1. Therefore, the air taken in and exhausted from the drying chamber is heat exchanged with each other in the heat exchanger according to the temperature difference, so that there is little loss of energy and the outside air is drawn into the drying chamber at a temperature close to the temperature inside the drying chamber.

9 is a heating and cooling device to maintain a constant temperature throughout the drying room.
Any device that can radiate and absorb heat may be used, such as a heat pump type cooling/heating device or a combination of a heater and a refrigeration device. 10 indicates a heat radiation or heat absorption port of the heating device. Reference numeral 11 denotes a blower installed in the drying chamber, which completely diffuses the air in the room and applies a constant amount of water to the grain container, which will be described later, to completely scatter the water film, which is a fluid film, that has moved to the surface of the object to be dried.

12 is a grain drying container, and the grain drying container has mounting legs 14.
It is installed in the drying chamber so that it can be rotated intermittently through the As shown in FIG. 2, the grain drying container is constructed by arranging a plurality of container conductors in which a hopper 16&, a hopper 16b, and a moving path 17 connecting and communicating the two hoppers are integrally formed. The hopper opening of the grain drying container is covered by a lid 18, 19 that can be opened and closed to allow grain to be taken in and out of the container.

Further, the hopper and passage section of the container are made of a net-like material or a breathable porous material, so that the air from the blower 12 directly hits the grains in the container. In addition, 19 is a ventilation space provided between the moving paths 17, 13 is a rotating shaft of the grain drying container, 15 is a motor for rotation thereof,
It rotates intermittently by a control device (not shown).

With the above structure, when grains are put into one hopper 16a of the grain drying container 12, the grains naturally fall through the movement path 17 and move to the lower hoppers 1&b. When the movement is completed, an appropriate control device operates to operate the rotational drive motor 15, completely inverting the grain drying container 12, and thereafter repeating the above-described operation 9. On the other hand, drying room 1
The inside of the grain is under a certain reduced pressure due to the operation of the exhaust fan 3, and is maintained at a constant temperature by the cooling/heating device, so the water inside the grain moves to the surface of the grain due to the reduced pressure. The moisture that has moved to the surface of the grain is dispersed through the mesh material by the air from the blower 11 passing through the ventilation space 19' during the movement, thereby uniformly drying the entire grain.

Using the entire device in the example above, the exhaust fan k for pressure reduction was operated at an output of 1.51 cw, and the output was 800 vx.
Reduce Aq by 8E and keep it in a drying room? 50 kg of rice was dried in 10 hours at a constant temperature of 20° C. As a result, high quality rice with excellent aroma, color, and taste could be obtained.

In the apparatus of the above embodiment, the cooling/heating device 9 is installed at the top of the housing 2 to directly radiate or absorb heat into the drying chamber, but the cooling/heating device is installed at the external intake lower of the heat exchanger 8. Also good. Furthermore, it goes without saying that this apparatus is suitable not only for drying grains but also for drying granular articles.

Effects Since the present invention is configured as described above, it has the following remarkable effects.

(G) Since it is vacuum drying, it does not require a large heat source, and the temperature inside the drying chamber can be set at will to suit the drying of the material to be dried, so drying efficiency is outstanding, and running costs are significantly reduced. It can produce dried grains of unparalleled quality.

(b) Grain is placed in a rotatable grain container made of ventilation material, and the grain is dried while moving within each container, so that the grain can be dried uniformly and efficiently.

fW Since the film of water that has moved to the sterilized proboscis surface is efficiently scattered by the blower and continuously dehumidified by the exhaust device, uniform drying is performed continuously.

) The device is simple and easy to operate, and
It is safe because it does not require a large heat source.

(e) By providing a heat exchanger, heat is exchanged between exhaust air and intake air, resulting in less energy loss, and the energy saving effect can be instantly enhanced.

[Brief explanation of drawings]

FIG. π1 is a side sectional view of one embodiment of the grain drying container according to the present invention, and FIG. 2 is a side view of the grain container. 1: Drying room 2: Residue 3: Exhaust device 4: Internal, exhaust port 5: External exhaust port 6: Internal intake port
7: External intake port 8: Heat exchanger 1 inner unit 9: Cooling/heating device] 1
:Blower]2:Grain drying container 16a, 16b:Hopper 17=Movers patent applicant

Claims (1)

[Claims] 1) A drying chamber configured with heat insulating materials and pressure-resistant materials, and the amount of air exhausted and intake within the time period from when the air in the drying chamber is exhausted until the air reaches a constant pressure. an exhaust device that controls the degree of decompression based on the difference in volume; a rotatable grain container installed in the drying chamber and made of a ventilation material such as a mesh material; and a constant air volume for the material to be dried in the grain container. A grain drying apparatus comprising a blower installed in the drying chamber and a cooling/heating device that maintains the inside of the drying chamber at a constant temperature, and drying grain under reduced pressure at a constant constant temperature. 2) The grain drying apparatus according to claim 1, wherein the grain container is constituted by a connected body of two hoppers. 3) The grain drying apparatus according to claim 1 or 2, wherein the air intake and exhaust into the drying chamber is performed through a heat exchange device installed outside the drying chamber. 4) The grain drying apparatus according to claim 1, 2 or 3, wherein the exhaust device is a blower fan. 5) The grain drying apparatus according to claim 1, 2 or 3, wherein the exhaust device is a vacuum pump.