JPS5947228B2 - Suction type paddy drying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows a part of the dry hot air forced into the take-out tank to be sucked and distributed directly to the ventilation drying section by the suction action of the suction exhaust machine, and at the same time, the other dry hot air is forced to flow through the suction action. After being ejected to the upper part of the storage tank through the elevator and the carry-in gutter by suction action, the inside of the storage tank is circulated by suction to the ventilation drying cylinder, thereby preventing the dew point phenomenon that tends to occur inside the storage tank. This invention relates to a suction type paddy drying method.

Dryers that perform drying by blowing dry hot air onto the paddy flowing vertically down the line use a suction drying method to prevent dust from flying around during drying and to enable concentrated dust removal.

By the way, in the suction drying method up to now, a storage tank, a ventilation drying cylinder, and a take-out tank are stacked one on top of the other in a three-dimensional manner, and a hot air generator is installed in front of the ventilation drying cylinder, and a suction exhaust fan is installed in the take-out tank. At the same time, the take-out tank and the storage tank were connected through an elevator and a carry-in gutter, and the paddy flowing vertically inside the ventilation drying barrel was dried by being exposed to dry hot air flowing from a hot air generator to a suction exhaust fan. .

However, according to the above-mentioned drying method, since the dry hot air generated by the hot air generator is forced into the ventilation drying drum, when it passes through the paddy flow path, it is affected by the resistance of the paddy and the dry hot air is When the grain enters the storage tank and is cooled by the outside temperature, a dew point phenomenon occurs on the side wall of the storage tank, which causes rice particles to adhere to the water droplets, causing uneven circulation and ensuring uniform drying. There was a drawback that it was not possible to do so.

Therefore, as a means to eliminate the dew point phenomenon even with the above-mentioned drying method, a technique was devised to increase the suction air volume of a suction/exhaust fan to draw and circulate cold outside air directly from the upper part of the storage tank into the storage tank.

By adopting this method, the amount of dew point phenomenon that occurs is somewhat reduced compared to the previous suction drying method, but as a result of sucking in cold outside air from the top, the rice that has been warmed up is heated by the contact effect with the outside air. The relative humidity of the air around the paddy is close to saturation, which causes the dew point phenomenon.Technically speaking, it is not much different from the conventional drying method, but the drying efficiency decreases by rapidly cooling the heated paddy. It was discovered that there are drawbacks that lead to

In view of the foregoing, the present invention has a storage tank, a ventilation drying cylinder, and a take-out tank stacked one on top of the other in three dimensions, a suction exhaust fan is disposed in front of the ventilation drying cylinder, and a pressure-feed hot air generator is provided. The take-out tank and the storage tank are connected through an elevator and a carry-in gutter, and a part of the dry hot air forced into the take-out tank by the forced hot air generator is transferred from the take-out tank to the ventilation drying cylinder by the suction action of the suction exhaust machine. The other direction is sucked and distributed, and the other dry hot air is blown out to the upper part of the storage tank through the elevator and the carry-in gutter by the pressure-feeding action of a forced-feed hot air generator, and then the inside of the storage tank is ventilated and dried by the suction action of the suction-exhaust fan. This is an attempt to provide a suction-type paddy drying method that allows suction to flow through the barrel so that no dew point phenomenon occurs and good dried paddy can be obtained. A preferred embodiment shown in the accompanying drawings will be described below.

1 is a storage tank 2 in which the paddy exposed to hot air is allowed to stand for a period of time in the upper stage and has sufficient capacity for the paddy itself to perform a conditioning action; and in the middle stage is a ventilation tank in which the paddy that has fallen by gravity from the storage tank 2 is exposed to hot air. The main body of the dryer consists of a drying cylinder 3 and a take-out tank 4 in the lower stage for collecting paddy which has been exposed to hot air and dried, which are successively stacked three-dimensionally, and the whole is formed into a rectangular cylindrical shape or any other cross-sectional shape. .

The peripheral wall of the ventilation drying cylinder 3 is shielded by a blind plate, and inside, one side is installed in front of the dryer main body 1, and a suction and exhaust blade wheel 8 is installed.
The hot air exhaust frame 5 is in communication with the suction/exhaust fan 7 which is configured by rotatably storing and discharging the air, and the hot air blowing frame 6 whose lower side is in communication with the extraction tank 4 is connected to the frames 5, 6. They are arranged vertically alternately so that a paddy flow path 9 of the same width is formed between them.

A feed-out roll 10 is rotatably mounted on a shaft below the paddy channel 9, and a burner 12 is installed on one side of the take-out tank 4 on the intake side, and a blower impeller 13 for pressure feeding is installed on the discharge side. A pressure-feeding type hot air generator 11 configured as a rotatably stored shaft is installed, and the generated dry hot air is force-fed and supplied into the extraction tank 4.

A transfer screw 14 is installed horizontally at the bottom of the take-out tank 4.
The other end of this communicates with an elevator 15 that controls paddy loading and circulation, and the upper part of the elevator 15 is connected to a carry-in gutter 16 installed horizontally at the top of the dryer main body 1.

A carry-in screw 17 is installed horizontally in the carry-in gutter 16 to convey the paddy into the storage tank 2 in a level state.

The communication portion 18 between the take-out tank 4 and the elevator 15 described above is formed to have a relatively larger diameter than the outer diameter of the transfer screw 14, and the paddy is transferred into the elevator 15 via the communication portion 18, and at the same time it is a pressure-feed type. A part of the dry hot air forced into the take-out tank 4 by the hot air generator 11 is also blown out from the communication part 18 to the upper part of the storage tank 2 through the elevator 15 and the carry-in gutter 16 by the force-feeding action of the forced-feed type hot air generator 11. After that, the paddy filled in the storage tank 2 is slowly circulated between the paddy layers filled in the storage tank 2 by the suction action of the hot air exhaust fan 7 to the ventilation drying section 3, and finally enters the hot air exhaust frame 5 and enters the atmosphere from the suction fan 7. A distribution effect is carried out that dissipates into the air.

Also, most of the dry hot air forced into the take-out tank 4 is caused to flow vertically from the take-out tank 4 through the hot air blower frame 6 and the paddy flow path 9 to the hot air exhaust frame 5 by the suction action of the suction exhaust fan 7. Let the paddy dry through ventilation.

A part of the dry hot air is forced to flow from the take-out tank 4 through the elevator 15, the carry-in gutter 16, and the inside of the storage tank 2, thereby warming the wall surface of the storage tank 2, and causing heat to be generated on the wall surface due to the temperature difference with the outside air. Perhaps this is an attempt to eliminate the usual dew point phenomenon, but rather to promote drying by providing a slight drying effect without lowering the temperature of the paddy that is returned to the storage tank 2.

Next, its effect will be explained.

Gold powder is filled into the dryer main body 1 via the elevator 15 and the carry-in gutter 16, and when a predetermined amount of paddy has accumulated in the paddy channel 9 and the storage tank 2, the supply is stopped and the pressure-feed hot air generator 11
and the suction/exhaust fan 7 are started together.

Most of the dry hot air generated by the forced hot air generator 11 is first fed and supplied into the take-out tank 4, and then
The hot air is introduced into the hot air blower frame 6 by the suction action of the suction exhaust fan 7,
Next, the rice passes through the paddy flow path 9 and exits to the hot air exhaust frame 5, and finally is concentratedly removed into the atmosphere by the suction exhaust fan 7.

When the dry hot air flows across the paddy flow path 9, it is uniformly applied to the paddy, drying the paddy flowing vertically, and when the paddy is dropped into the take-out tank 4 by the feed roll 10, the hot air is applied again to the paddy. At the same time, the dust mixed in the paddy layer is dried to a state where it is easy to separate it from the paddy.

Therefore, the above-mentioned paddy, after being subjected to the drying action described above, is returned to the storage tank 2 through the transfer screw 14, the elevator 15 and the carry-in gutter 16 in a heat-extinguishing state, and is then stored for a period of time. Since it is subjected to a drying action, the paddy is dried to a predetermined moisture content through multiple circulation actions.

During such a drying process, a part of the dry hot air forced into the take-out tank 4 by the force-feeding action of the forced-feed hot air generator 11 is forced from the take-out tank 4 through the communication part 18 into the elevator 15,
After that, the paddy is ejected from the elevator 15 to the upper part of the storage tank 2 through the carry-in gutter 16, and then slowly passed through the ventilation drying cylinder 3 between the layers of paddy stored in the storage tank 2 in a state of heat dissipation due to the suction action of the suction/exhaust fan 7. While being distributed, the hot air exhaust frame 5
Finally, the dust is concentrated into the atmosphere together with the dry dust exhaust air after being dried by the suction/exhaust fan 7.

Therefore, a part of the drying hot air is sucked and distributed from the upper part of the storage tank 2 to the ventilation drying cylinder 3 during the drying operation.
It quickly suctions and removes the rising moisture that adheres to walls and tends to occur due to temperature differences, completely eliminates the occurrence of dew point phenomenon, and allows the paddy to flow down evenly and dry evenly without causing uneven circulation. Even if the paddy is in storage, the drying action can be performed to promote drying.

In short, since the present invention is equipped with the above-mentioned method, dry hot air generated by the pressure-feeding hot air generator 11 is forced into the take-out tank 4 at the lowest stage, and then a part of this dry hot air is sucked and discharged The suction action of No. 7 causes the drying air to flow evenly through the ventilation drying drum 3 and is applied to the vertically falling paddy to dry it uniformly.Other dry hot air is taken out directly from the take-out tank 4 by the force-feeding action and is stored via the elevator 15 and the carry-in gutter 16. After spouting to the upper part of the tank 2, the inside of the storage tank 2 is slowly sucked and circulated toward the ventilation drying cylinder 3 by suction, and the rising moisture that tends to adhere to the walls of the storage tank 2 is actively suctioned and removed. At least storage tank 2
It is possible to completely eliminate the dew point phenomenon that tends to occur on the wall surface due to temperature differences, allowing the paddy to flow down at a uniform flow rate without causing uneven circulation, and more uniform drying work can be performed.

Moreover, since high-temperature dry hot air flows in the needle storage tank 2, the stored paddy in a heat-dissipating state is maintained in a heat-retaining state without being cooled, and the next drying process is carried out effectively. In 2, not only can the drying action be carried out to promote drying, but also the elevator 15 can be used as a distribution duct for dry hot air to prevent the dew point phenomenon and promote drying, so an equivalent separate device is not required, and the method described above can be carried out. It exhibits useful features that can be achieved with a simple configuration.

[Brief explanation of drawings]

The drawings show one embodiment of an apparatus using the method of the present invention, in which FIG. 1 is a longitudinal sectional front view, and FIG. 2 is a longitudinal sectional side view with main parts cut away. 2... Storage tank, 3... Ventilation drying cylinder, 4
...Take-out tank, 7...Suction exhaust fan, 1
1... Pressurized hot air generator, 15... Elevator, 16... Carry-in gutter.

Claims (1)

[Claims] 1. A storage tank, a ventilation drying cylinder, and a take-out tank are sequentially stacked three-dimensionally, a suction exhaust fan is arranged in front of the ventilation drying cylinder, and a take-out tank and a storage tank equipped with a pressure-feed hot air generator are installed. are connected via an elevator and a carry-in gutter, and a part of the dry hot air forced into the take-out tank by the forced hot air generator is sucked and distributed from the take-out tank to the ventilation drying drum by the suction action of the suction exhaust fan. The other dry hot air is blown out to the upper part of the storage tank through the lift and the carry-in gutter by the pressure-feeding action of the forced-feeding hot-air generator, and then sucked and distributed inside the storage tank towards the ventilation drying drum by the suction action of the suction exhaust fan. A suction type paddy drying method characterized by the following.