JP2009293812A - Grain dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grain dryer allowing both quick drying and drying of high efficiency. <P>SOLUTION: An exhaust gas circulation type grain dryer includes a drying part (3) provided with a hot air chamber (11) for receiving hot air from a hot air supply part (6), and a grain collecting part (4) for circulating a grain, and for drying the grain by the hot air, and a suction discharge part (7) for discharging splittingly discharge air to be miscible with the hot air in the hot air chamber (11), the grain collecting part (4) includes a hot air passage (4a) by an far-infrared ray radiator for radiating an far-infrared ray while guiding the hot air from the hot air supply part (6), a hot air duct (8) is provided communicatedly with a terminal end, to guide the hot air to the hot air chamber (11), and the hot air duct (8) is communicated with a divergent side of the suction discharge part (7). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a grain dryer for drying a grain by circulating the grain in a hot air permeable drying unit.

  An exhaust air circulation type grain dryer described in Patent Document 1 is known. This grain dryer is configured to include a drying unit that receives hot air from a burner to dry the circulating kernels in hot air, and a suction discharge unit that discharges the exhausted air so that it can be mixed with the hot air. The high-temperature and high-humidity mixed hot air, which is a mixture of hot and humid exhaust air, enables high-speed drying without drying obstacles such as shell cracks.

Further, a far-red wave irradiation type grain dryer described in Patent Document 2 is known. This grain dryer is constructed by installing a far-infrared radiator in the grain collecting part for collecting and circulating the grain discharged from the drying part that is hot-air dried, and combined with irradiation of far-infrared waves. Enables efficient grain drying.
JP 2007-10247 A JP 2007-218583 A

  The problem to be solved is to provide a grain dryer that enables both high speed drying and high efficiency drying.

  The invention according to claim 1 includes a hot air chamber that receives hot air from the hot air supply unit and a cereal collecting unit for circulating the grains, and a drying unit that dries the circulating grains with hot air, and the exhaust air can be mixed with the hot air. In the exhaust air circulation type grain dryer provided with a suction discharge part for diverting and discharging into the hot air, a hot air passage by a far-infrared radiator that emits far-infrared waves while guiding the hot air from the hot air supply part is provided in the grain collecting part. A hot air duct is provided in communication with the end of the hot air duct to guide the hot air to the hot air chamber. The hot air duct is connected to the flow dividing side of the suction / discharge section.

  The hot-air passage by the far-infrared radiators receives a high-temperature hot air from the hot-air supply unit in the cereal collection unit to act a far-infrared wave on the discharged grains of the cereal collection unit, and the drying unit communicates with the hot-air chamber The hot air duct receives the mixed hot air from the hot air from the hot air passage by the far-infrared radiator and the high-humidity exhaust air diverted from the suction discharge unit to dry the circulating kernel.

According to a second aspect of the present invention, in the configuration of the first aspect, the hot air supply unit is disposed on the front surface of the drying unit, and the suction / discharge unit and the hot air duct are disposed on the rear surface of the drying unit.
The diverted exhaust air from the suction / discharge section arranged at the rear surface is combined and mixed with the hot air from the hot air supply section through the shortest path from the suction / discharge section by the hot air duct arranged at the rear surface.

  In the invention of claim 1, since the shunting side of the suction discharge unit is connected to the hot air duct communicating with the far-infrared radiator of the cereal collecting unit, the drying process by the far-infrared wave in the cereal collecting unit and the shunt exhaust wind are combined. The mixed hot air is supplied to the drying section from the hot air duct that performs the drying process using the high-humidity hot air. Therefore, the exhaust-air circulation type grain dryer having the above-described configuration performs high-quality drying without drying obstacles such as torso cracking at high speed and efficiency by the mixed hot air from the hot air chamber and the far-infrared wave in the cereal collection unit. be able to.

  In the invention of claim 2, in addition to the effect of the invention of claim 1, the hot air supply part is arranged on the front surface, and the suction exhaust part and the hot air duct are arranged on the rear surface. Therefore, the mixed hot air can be efficiently supplied to the drying section for drying treatment.

  As shown in FIG. 1, the grain dryer includes a main part longitudinal side view (a) and a main part rear view (b) showing its internal configuration, and a storage part 2 that receives the stretched grain, and the storage part. The drying unit 3 for drying hot air while flowing down the grain from 2 is placed one above the other, and the lower part of the drying unit 3 is a grain collecting unit 4 for returning the discharged grain to the storage unit 2, and this grain collecting unit The far-infrared radiator 4a which irradiates a 4 grain with a far-infrared wave is arrange | positioned.

  At the front position of the drying section 3, the elevator section 5 from the cereal collection section 4 to the upper part of the storage section 2, the hot air supply section 6 by the burner 6 a, and at the rear position by the exhaust fan 7 a and the diversion valve 7 b A suction discharge unit 7 that discharges in a divertable manner, a hot air duct 8 that mixes and mixes the hot air and the diverted exhaust air and guides the mixed hot air to the drying unit 3, and the like are configured to be able to dry while circulating the grains.

  More specifically, the drying unit 3 includes a hot air chamber 11 that receives the mixed hot air from the hot air duct 8 at the rear surface, an exhaust air chamber 12 that is connected to the suction exhaust unit 7, and the hot air chamber 11 and the exhaust air chamber 12. It is composed of four lanes of dry net passages 13 formed by opposed perforated plates that guide the grains received from the storage unit 2 while being defined so as to be permeable and receiving hot air.

  The two adjacent lanes of the dry net passages 13 and 13 are merged at the lower end, and the flow rate of the grain flowing down through the dry net passages 13 and 13 is determined by providing a flow rate adjusting metering valve 14 at the merge position. Adjust. The drying net passages 13, 13 are configured to extend over the entire length between the front and rear end faces of the drying unit 3, and the air passage 12 is formed between the two lanes of the drying net passages 13, 13 that join together. The outside of 13 and 13 is made into the hot air chamber 11, and this is arranged in the right and left, so that the hot air chamber 11 and the left and right two exhaust air chambers 12 and 12 of the three hot air block configurations of the center 11a and the left and right 11b and 11b of the drying unit 3 are arranged. Configure.

  The cereal collection unit 4 includes left and right inclined plates 17 and 17 for collecting the discharged kernels below the fixed delivery valve 14 and a transfer spiral 18 for transferring the aggregated grains to the elevator unit 5. A hot air passage 4a communicating with the hot air duct 8 from the burner 6a is formed by a far-infrared radiator in the central hot air block 11a above the transfer spiral 18. The hot air passage 4a by this far-infrared radiator irradiates and heats all the grains of the cereal collecting unit 4 by radiating far-red waves over the entire length while guiding the hot air from the burner 6a.

  The hot air duct 8 is interposed between the end of the hot air passage 4a of the far-infrared radiator and the hot air chamber 11 so as to distribute the hot air of the burner 6a to the hot air blocks 11a and 11b on the center and the left and right sides. While providing in the back part of the drying part 3, it connects with the diverting duct 7c of the said suction discharge part 7 in the right-and-left center part of the hot air duct 8, and it is set as the structure mixed and mixed with a hot air by receiving a shunt exhaust wind. In addition, if necessary, an outside air inlet for mixing outside air is provided.

(Exhaust air circulation operation)
Next, the exhaust air circulation operation by the grain dryer will be described.
As shown in FIG. 2, an operation explanatory diagram of the drying operation of the grain dryer is generated by the burner 6 a in the hot air supply unit 6 arranged in the front, and this hot air is provided in the cereal collection unit 4. The hot air passage 4a by the infrared radiator emits far red waves over the entire length thereof and is guided to the hot air duct 8 arranged at the rear surface. The hot air duct 8 is supplied with high-humidity exhaust air diverted to the diversion duct 7c at a desired ratio by the diversion valve 7b of the suction / discharge section 7 arranged at the rear surface, and the hot air and the exhaust air are mixed and mixed. The mixed hot air reaches the blocks 11a and 11b of the hot air chamber 11, passes through the drying net passage 13, and is sucked and discharged from the exhaust air chamber 12 by the suction and discharge section 7 while drying the passing grain.

  By such exhaust air circulation operation, the hot air passage 4a by the far-infrared radiator acts a far-red wave on the whole grains of the grain collection unit 4 by receiving high temperature hot air from the hot air supply unit 6 in the grain collection unit 4. . Further, the drying unit 3 receives the mixed hot air by the hot air duct 8 communicating with the hot air chamber 11 and the high-temperature hot air from the hot air passage 4 a and the high-humidity exhaust air diverted from the suction discharge unit 7 to dry the circulating grains. To do.

  For example, while suppressing the air volume of the burner 6a and sending hot hot air to the hot air passage 4a, the far-infrared radiator is held at a high temperature (about 400 ° C.), and the grains of the grain collection unit 4 are irradiated with far-red waves. , By supplying the mixed hot air with the temperature and humidity adjusted by mixing the diverted exhaust air and the introduced outside air to the drying unit 3 and drying the circulating grains, thereby achieving high quality drying without drying obstacles such as shell cracks. It can be performed quickly and efficiently.

  Further, by arranging the hot air supply unit 6 on the front surface of the drying unit 3 and the suction / discharge unit 7 and the hot air duct 8 on the rear surface of the drying unit 3, the diverted exhaust air from the suction / exhaust unit 7 has the shortest path. Is sent to the hot air duct 8 and is mixed and mixed with the hot air from the hot air supply unit 6 in the hot air duct 8, so that a long recirculation duct for sending the exhaust air to the hot air supply unit 6 on the front surface of the machine body becomes unnecessary. As a result, the airframe configuration is simplified and the exhaust heat loss is suppressed, so that the mixed hot air can be efficiently supplied to the drying unit 3.

  In this case, the hot air duct 8 is arranged over the center and the left and right three hot air blocks 11a and 11b constituting the hot air chamber 11, and a part of the diverted exhaust air extracted from the exhaust air fan 7a by the diverting duct 7c and the central position. The high-temperature air from the hot air passage 4a is merged and mixed, and then sent to the central and left and right three hot air blocks 11a and 11b in a balanced manner. The combined flow rate of the diverted exhaust air is adjusted by the diverter valve 7b according to the drying conditions. In addition, by introducing outside air from the rear of the aircraft through the outside air inlet, it is possible to cope with fluctuations in the combined flow rate of the shunted exhaust air and to adjust the hot air from the hot air passage 4a by the far-infrared radiator to the normal hot air temperature. Can do.

  Further, in order to evenly distribute heat to the three hot air blocks 11a and 11b, a distribution passage for individually connecting the radiator 4a and the left and right hot air blocks 11b and 11b is provided inside the hot air duct 8 as necessary. 8a and 8a are disposed. As shown in FIG. 4, a plan view of the main part of the internal structure of the radiator 4a is formed with a hole 4b for releasing heat by a central hot air block 11a in order to apply suction. The radiator 4a is configured so that dust is not collected by opening the lower part, thereby preventing a fire due to accumulation of dust recirculated together with the diverted exhaust air.

  In addition, as shown in FIG. 3, the suction and discharge portion 7 includes a diverting duct 21 for taking out the diverted exhaust air upward from the exhaust fan 7a, as shown in FIG. Provided and communicates with the left and right hot air blocks 11b, 11b of the hot air chamber 11 via the left and right branch ducts 22, 23. With such a configuration, by mixing the diverted exhaust air with the left and right hot air blocks 11b and 11b, the exhaust air does not hit the radiator 4a, and thus safety can be ensured. Therefore, it is possible to perform an efficient drying process while ensuring the safety of the radiator 4a in the configuration in which exhaust air, high temperature air, and outside air are mixed at the rear surface of the dryer.

Main part longitudinal side view (a) and main part rear view (b) showing the internal configuration of the grain dryer Action explanatory diagram by dry air circulation of grain dryer Main part longitudinal side view (a) and main part rear view (b) of a suction / discharge part of another configuration The principal part top view showing the internal structure of the grain dryer of FIG.

Explanation of symbols

2 Reserving part 3 Drying part 4 Grain collecting part 4a Hot air passage (far-infrared radiator)
6 Hot Air Supply Unit 6a Burner 7 Suction / Discharge Unit 7a Exhaust Fan 7b Diverging Valve 7c Diverging Duct 8 Hot Air Duct 11 Hot Air Chamber 11a Central Block 11b Outer Block 13 Drying Net Passage 14 Fixed Feed Valve

Claims (2)

A hot air chamber (11) that receives hot air from the hot air supply unit (6) and a cereal collecting unit (4) for circulating the grains, and a drying unit (3) for drying the circulating kernels with hot air; In the exhaust air circulation type grain dryer provided with the suction exhaust part (7) which shunts the hot air (11) so as to be mixed,
The cereal collecting part (4) is provided with a hot air passage (4a) by a far-infrared radiator that radiates far-red waves while guiding the hot air from the hot air supply part (6), and communicates with the end of the hot air passage (4a). An exhaust air circulation type grain dryer characterized in that a hot air duct (8) for guiding to the chamber (11) is provided, and the hot air duct (8) communicates with the branch side of the suction discharge section (7).   The said hot air supply part (6) is arrange | positioned at the front part of the said drying part (3), and the said suction discharge part (7) and a hot air duct (8) are arrange | positioned at the said rear surface part. Grain dryer.

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