JPS6022264B2 - Vacuum drying equipment - Google Patents

Description

Detailed Description of the Invention The present invention maintains a constant reduced pressure state by forcibly reducing the pressure in a closed chamber, and continuously generates frictional heat during the reduced pressure.
Furthermore, the ventilation plate is used to uniformly diffuse the airflow which has been rectified and adjusted, thereby promoting the separation and dissipation of the moisture contained in the stored items such as shiitake mushrooms, thereby rapidly drying them.

Now, one embodiment of the present invention will be described with reference to the drawings. The front side of a drying chamber 1 whose upper and lower four circumferential walls are heat-retainingly sealed with heat insulating material is a double door body 2, 2, and a suction port is provided in the center of the ceiling of the sealed chamber. A forced suction heat generating device 4 is provided in the drying chamber 1, and an air intake passage 6 with an intake port 5 at the front is installed in the inner bottom of the drying chamber 1, and a bearing tube 7 is provided in the center of the air intake passage 6. Impeller tube 8 with
An intake adjustment cock 11 with a handle 10 protruding toward the front of the room is provided in the conduit 9, and a bypass pipe 12 is provided in parallel with the conduit 9.

Furthermore, baffle plates 13, 13 are provided inside the intake air introduction passage 6, respectively.
The impeller cylinder 10' is equipped with several (four in the figure) oblique diffusion vanes, each of which has a nozzle groove 17 at its top. 16,16,1
The impeller 18 at the bottom of the diffusion tube 19, in which the lotus tanks 6 and 16 are arranged in a radial manner, is supported by the impeller 18, and the net shelves 2 are installed in several stages indoors.
0, 20... A large number of movable dominant diagonal pieces 21 are arranged within the frame on the lower side.
Ventilation plates 22, 2 which movably support 21, .
2... is featured. 23 is a peephole, and 24 is a control board.

Artificial drying of shiitake mushrooms, leaf tobacco, etc. conventionally required a considerable amount of fuel as a heat source in the drying chamber, took a long time, and had the disadvantages of uneven drying. For example, only a small amount of fuel is needed as an auxiliary aid, and drying can be carried out uniformly and efficiently in an extremely short period of time under conditions close to natural. That is, the items to be dried, such as shiitake mushrooms, are stored and reloaded on the ventilation plate 22 of the indoor mesh shelf, and the corpses 2, 2 are closed.

Then, by operating the handle 10 at the bottom to close the adjustment cock 11 and operating the forced suction heat generating device 4 using a ceiling suction fan, etc., the air in the sealed room will be sucked out from the ceiling suction port and noticeably While the pressure is reduced, the device 4 maintains equilibrium in a constant reduced pressure state, and generates frictional heat to gradually increase the temperature inside the chamber 1. Therefore, the free moisture on the surface of the object to be dried as well as the contained moisture are separated and released, and at the same time, the air is heated by the heating element 16 in the intake air intake 6 from the bypass pipe 12 parallel to the conduit 9 closed by the intake air adjustment cock 11. The intake air is sucked into the impeller tube 8 as a small amount of ventilation, and the suction ventilation force rotates the impeller 18 around the central shaft 19 supported by the bearing tube 7, and at the same time, the ventilation is caused by radial oblique diffusion. It enters the blade 16 and is ejected obliquely upward from the nozzle groove 15 at the upper edge of the valley. Therefore, the oblique diffusion vane 16 itself also applies a rotational force due to the reaction force, causing convection of the indoor air while uniformly diffusing the floor air indoors. The drying process is accelerated. Then, due to the ventilation introduced into the room, the movable inclined piece 23 of the ventilation plate 22 automatically changes its slope depending on the amount of ventilation, so that the ventilation passes uniformly from the entire surface of the ventilation plate, and the material to be dried on it is uniformly heated. Dry at a warm temperature. Ventilation plate 22
The direction of inclination of the movable inclined pieces 23 is set so that the ventilation plates are mounted in the opposite direction to those adjacent to each other and those above and below, and this synergizes with the diffusion blades to make ventilation even more effective. The baffle plates 13, 13, . . . in the intake air introduction path 6 are heating elements 14, 1.
4...Increases the retention of upper airflow and helps efficient heating. Depending on the type of material to be dried, the intake air weight can be adjusted by operating the lower handle 12 to adjust the opening of the intake adjustment cock 11 and introducing the intake air from the conduit 9 into the impeller cylinder 8, and the ventilation plate 22 can be moved. Due to the size of the opening of the diagonal piece 23 and the size of the gap, the heated air which has been rectified and whose air volume has been adjusted is uniformly convectively diffused. Therefore, the decompression action increases the release of the moisture contained in the stored items, promoting separation and evaporation, and the uniform aeration action promotes the separation and evaporation of the highly liberated moisture, allowing air drying in conditions close to natural. and significantly shorten drying time. The intake air adjustment cock 11 is fully opened when ventilation is the main purpose, and works to scoop up the intake air by the rotation of the diagonal diffuser vanes 16, 16, etc., and is fully opened for moisture-free sushi and materials to be dried. Increase vacuum. The heating elements 14, 14, . . . are energized so as to move with the room temperature thermostat and, if necessary, heat and dry to increase the release of the contained moisture. As described above, the present invention promotes the separation and dissipation of free moisture and contained moisture by the depressurizing effect of the closed chamber, the frictional heat effect, and the ventilation effect of uniformly diffused air, and hardly uses a heat source, and even if a heat source is used, it is different from the conventional one. This has the effect of significantly shortening drying time, increasing drying efficiency, and saving energy at a fuel cost of one-tenth.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of the whole with a part cut away, FIG. 2 is a perspective view of an inclined diffusion vane, and FIG. 3 is a perspective view of an intake air introduction path. It is. 1... Drying room, 2, 2... Door body, 3... Suction port, 4... Forced suction heat generating device, 5... Intake □, 6... Intake Introductory passage, 7...Bearing tube, 8...
・Impeller node, 9... Conduit, 10... Handle, 11... Intake air adjustment cock, 12...
...Bypass pipe, 13,13...Baffle plate, 14
, 14... Heating element, 15... Nozzle groove, 1
6, 16... Oblique diffusion vane, 17... Central cylinder, 18... Impeller, 19... Central shaft, 20... Net shelf , 21, 21... Movable inclined piece, 22... Ventilation plate, 23... Peephole, 24... Control board. Figure 2 Figure 3

Claims (1)

[Claims] 1 A heat-retaining sealed drying room and a forced suction heating device installed in the center of the ceiling of the room that can forcefully draw indoor air to the outside and generate frictional heat to raise the indoor temperature. An intake introduction passage containing a built-in heater having an intake port on the front side is disposed at the bottom, and the intake introduction passage and the impeller tube are connected through a conduit, and an intake adjustment knob is attached to the conduit. Further, the intake air introduction passage and the impeller tube are connected through a bypass pipe parallel to the conduit, and the impeller tube includes:
The impeller of the diffusion cylinder, in which the upper edge of the diffusion vane is a nozzle groove, is installed in communication with the cylinder, is loosely supported, and the lower side of the net shelf installed in the room is supported in a frame with a number of movable inclined pieces. A reduced pressure drying device characterized by a structure equipped with a ventilation plate.