JPH074464Y2 - Blower reversing device for dry hot air in sample grain dryer - Google Patents

Description

[Detailed Description of the Invention] “Industrial application field” The present invention is a sample grain dryer, in which the direction of air flow of the dry hot air blown to the sample container is freely reversed so that the sample grain has a predetermined moisture value. The present invention relates to a blower reversing device for dry hot air in a sample grain dryer that can finish and dry accurately and quickly.

“Conventional technology” Conventionally, in a joint drying facility, a portion of each grain brought in by an individual or by a shipper was dried to a certain moisture value under the same drying conditions and dried, and the grain brought in was carried. A sample grain dryer is used to distribute the selling price of producers according to the minutes, and as a typical example thereof, the one described in Japanese Patent Laid-Open No. 56-124883 prior to the present application is known. ing. In the known sample grain dryer, the heat generator is housed inside one side of the dryer frame, and the inside of the other side is connected to the heat generator with the laid drying shelf as a boundary and one side. It is divided into a lower air passage equipped with a suction / exhaust fan, and a storage container that is inserted and inserted freely through an opening window that opens in the front of the dryer frame is placed in parallel on the drying shelf and placed inside the storage container. One or more dry boxes containing sample grains are placed so that they can be freely taken out, and the hot air generated in the hot air generator is passed through the inside of the dry box from the upper air passage to the lower air passage by the negative pressure of the suction air exhauster. The grain stored in the dry box is dried quickly after being distributed to the market.

"Problems to be solved by the device" By the way, in the conventional sample grain dryer, the hot air obtained by one heat generator is stored in a large number of storage containers during the drying operation of the sample grain. On the other hand, because it was designed to allow one-sided ventilation at the same time, it becomes impossible to evenly heat the uniform temperature and uniform hot air of the hot air to the sample grains stored in the respective storage containers, resulting in uneven temperature,
The unevenness of the air volume is likely to occur, and a large difference occurs in the drying rate in each storage container, and the drying rate cannot be made constant.

Therefore, in order to solve this problem, dry hot air generated by a dedicated hot air generator is blown to each of the sample grains stored in each sample box so that the drying speed is kept constant. Was developed before the present application (for example, JP-A-61-252476).

However, even in the above sample grain dryer, the heat source for generating the dry hot air is not operated before the start of the drying operation, so the hot air temperature is quickly raised to the desired temperature at the same time when the drying is started. Perhaps it cannot be warmed, or because the dry hot air is one-sided, even if the flow of the dry hot air is cut off when the sample grain finishes to the specified moisture value, However, there is a problem in that the drying is progressed and the water is dried to a predetermined moisture value or more.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to keep the heat source body in a heat-generating state at all times and to keep the temperature of dry hot air at the same time as the start of drying. When the sample grain is dried, the pressure-feeding fan is operated to heat the sample grain to dry it when the sample grain is dried, and when the sample grain is dried to the specified moisture value, At the same time when the operation is stopped, the suction fan is operated to suck the dry hot air, not to mention the dry hot air staying in the upper blower chamber and the sample container, so that it does not come into contact with the sample grains, and reverse the flow direction. In addition, it is an object of the present invention to provide a blown air reversal device for dry hot air in a sample grain dryer in which the finished moisture value of the sample grain is accurate.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the blower reversing device for the dried hot air in the sample grain dryer of the present invention communicates with each other in the ventilation casing whose tip side communicates with the bottom ventilation surface of the sample container. It is divided into an upper air-blowing chamber and a lower heat-generating chamber.In the upper air-blowing chamber, there is a pressure-feeding fan that operates only during the drying operation and blows air toward the bottom ventilation surface of the sample container. The maintained heat source and the operation of the pressure-feeding fan are stopped at the same time as the drying is completed, and at the same time, they are operated to suck in the dry hot air staying in the upper blowing chamber and the sample container and suck it out from the lower heating chamber Each has a fan.

"Operation" Now, extract a part of multiple kinds of grains brought in by individual or shipper, and accurately dry sample grains under the same drying conditions so as to have a constant finishing moisture value. In order to obtain a sample grain for accurate distribution of the producer's selling price according to the share of grain, first of all, different types of grain brought in by individual or consignor. Is extracted to form a sample grain, which is placed in one of the sample containers. Next, after the sample container is placed on the ventilation casing, the dry hot air generated by the heating action of the heat source body, which is always kept in a heat generation state when the pressure-feeding fan is operated, causes the dry hot air to be generated at the bottom of the ventilation casing by the pressure-feeding action of the pressure-feeding fan. The sample grain is dried by being blown into the sample container through the ventilation surface.
Then, the sample grain has a predetermined moisture value (for example, 14.5%).
When it is dried, the pumping fan is stopped immediately and the suction fan is operated at the same time. By the way, not only the heat generated from the heat source due to the suction action of the suction fan but also the dry hot air staying in the upper blower chamber and the sample container is immediately sucked by the suction fan and the flowing direction of the dry hot air is reversed. . As a result, even if the heat source is constantly maintained in a heat-generating state, the sample grain cannot be exposed to dry hot air after the sample grain has been dried to the predetermined moisture value.
The drying does not proceed any further, and the sample grain dried to a predetermined moisture value can be quickly obtained.

[Example] An example will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a ventilation casing having a rectangular casing shape, and a horizontal upper surface 2 of the ventilation casing 1 has an open opening 4
Then, the sample container 12 can be freely placed on the horizontal upper surface 2.

In addition, the inside of the ventilation casing 1 is partitioned by the partition wall 3 into the upper blower chamber 5 and the lower heat generating chamber 6, and the upper blower chamber 5 and the lower heat generating chamber 6 are communicated with each other through the communication passage 7. In the upper blower chamber 5 near the communication passage 7, a sirocco-type pressure-feeding fan 8 is provided, which is operated only during a drying operation and blows dry hot air toward the bottom ventilation surface 13 of the sample container 12. A heat source body 9 composed of a heater or the like which is constantly maintained in a heat generating state is housed in the lower heat generating chamber 6, and the operation of the pressure feeding fan 8 is stopped at the base end side of the lower heat generating body 6 at the time of completion of drying. A suction fan 10 that is operated at the same time to suck the dry hot air staying in the upper blower chamber 5 and the sample container 12 and suck it out from the lower heat generating chamber 6 to the outside is housed. Reference numeral 11 is an intake and discharge port of the suction fan 10 of the white skirt type. Therefore, the pressure-feeding fan 8 is arranged in front of the heat source body 9 and the suction fan 10 is arranged in the rear thereof. The above-mentioned sample container 12 is formed in a box shape as a whole, the upper surface is open, and the bottom is provided as the ventilation surface 13 so that an appropriate amount (for example, 600 g) of sample grain can be stored. .

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

Permitting the temperature of the dry hot air to rise quickly so that the sample grain can be exposed to the dry hot air of the specified temperature from the beginning of drying to facilitate quick drying work, or the dry hot air of the specified temperature is fed under pressure during the drying operation. In this operation, the sample grain can be smoothly circulated to the sample container to finish it to a predetermined moisture value and dried, and after the sample grain has been dried to the predetermined moisture value, the operation of the pressure feeding fan is stopped. ,
Even when only the suction fan is operated and the heat source body is always in a heat generating state, the dried hot air generated by reversing the flow direction of the dried hot air is accumulated in the ventilation casing and the sample container as well as the generated hot air. The dried hot air is exhausted to the outside of the ventilation casing by the suction fan to prevent the sample grain from further drying and to always dry it to a predetermined moisture value.

[Brief description of drawings]

FIG. 1 is an overall perspective view, and FIG. 2 is a vertical sectional front view of FIG. DESCRIPTION OF SYMBOLS 1 ... Ventilation case, 3 ... Partition wall, 5 ... Upper ventilation chamber, 6 ... Lower heating chamber, 7 ... Communication path, 8 ... Pressure feeding fan, 9 ... Heat source body, 10 ...
Suction fan, 12 ... Sample container, 13 ... Bottom ventilation surface

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A ventilation container, the tip side of which communicates with the bottom ventilation surface of the sample container, is divided into an upper ventilation chamber and a lower heat generation chamber which communicate with each other, and the upper ventilation chamber is operated only during a drying operation. The blower fan that blows air toward the bottom ventilation surface, the heat source that is always kept in the lower heat generating chamber, and the operation of the blower fan when drying is stopped are operated at the same time, and the upper blower chamber and the sample A blower reversing device for the dry hot air in the sample grain dryer, which is provided with suction fans for sucking the dry hot air staying in the container and sucking it out from the lower heating chamber