JPS61184378A - Cereal grain 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] Industrial applications This invention relates to a grain dryer.

Conventional technology Conventionally, as in Japanese Patent Laid-Open No. 57-144876, an outside air humidity detection sensor that detects outside air humidity and an exhaust air humidity detection sensor that detects exhaust air humidity are used. The device compared the detected humidity and, if the exhaust air humidity was lower, returned a certain amount of the exhaust air from the exhaust fan to the burner section.

Problems to be Solved by the Invention The grains flowing down in the drying chamber from the upper storage chamber are removed from the drying chamber by sucking the hot air generated by the front burner with the exhaust fan at the rear. During the drying process, if the temperature of the hot air generated from the burner is maintained at the same temperature from the beginning of the drying process to the finishing stage, the outside air temperature will be lower at the beginning of the drying process. The temperature of the hot air and the exhaust air temperature are almost equal, and the drying efficiency is good, but during the drying process, the temperature of the exhaust air becomes higher than the outside air temperature and the drying efficiency is poor. When the specified drying speed cannot be obtained, or during drying work where the outside air temperature is low, the burner is cooled by this low outside air wind, resulting in poor vaporization of the combustion fuel and incomplete combustion, resulting in carbon generation. This may result in poor combustion conditions in the burner.

Means for solving the problem This invention has a storage chamber (1) in the upper part and a drying chamber (2) in the lower part.
The drying chamber (2) has a burner (3) at the front and an exhaust air m (4) at the rear to direct the hot air generated by the burner (3) from the hot air chamber (5) to the drying chamber ( 2) is provided to cross-ventilate and suck and exhaust the air to the exhaust fan (4) through the exhaust chamber (6), and the exhaust fan (4) and the burner (3) are communicated so that one part of the exhaust air is An exhaust air return path chamber (7) that returns the air, an outside air temperature detection sensor (8) that detects the outside air temperature, and the exhaust fan! (4
) is provided to detect the temperature of the exhaust air sucked and discharged, and the difference between the exhaust air temperature detected by the detection sensor (9) and the outside air temperature detected by the detection sensor (8) is provided. The burner (3) passes through the exhaust air return path chamber (7) in connection with the
) A grain dryer is provided with a control device for controlling the amount of exhaust air to be returned to the grain dryer.

Function and effect of the invention The grains stored in the dryer are transferred from the storage chamber (1) to the drying chamber (
2) The hot air generated by the burner (3) is sucked by the exhaust fan (4) while flowing down inside the drying chamber (2), and the hot air is passed from the hot air chamber (5) across the drying chamber (2). ), the air is exhausted by the exhaust fan (4), and is exposed to this hot air to dry it. During this drying process, the outside air temperature detection sensor (8)
) detects the outside air temperature, the exhaust air temperature detection sensor (9) detects the exhaust air temperature, and the exhaust fan (4) sucks and exhausts air based on the difference between the detected exhaust air temperature and the outside air temperature. A part of the exhaust air is returned from the exhaust fan (4) to the burner (3) through the exhaust air return path chamber (7), and the amount of the returned exhaust air varies depending on the detected temperature difference.

The hot air generated by the burner (3) is simultaneously drawn into the hot air chamber (5) to dry the grains.For example, if the detected outside air temperature is low and the detected exhaust air temperature is high. When this temperature difference is large, the amount of reducing exhaust air returned to the burner (3) section is increased, and when the temperature difference is small, the amount of reducing exhaust air is controlled to be decreased.

Conventionally, a certain amount of exhaust air was returned to the burner (3) section, but according to the present invention, the outside air temperature detected by the outside air temperature detection sensor (8) and the exhaust air temperature detection sensor (9) are detected. Since the amount of returned exhaust air is automatically adjusted depending on the difference between the exhaust air temperature and the Contrary to the drying rate, the drying rate gradually increases as the moisture content of the grain decreases, and as the drying rate decreases, the exhaust air gradually increases in the early, middle, and finishing stages of the drying process. During the middle and finishing stages when the drying loss rate decreases, this reduced exhaust air effectively prevents the drying loss rate from decreasing, making it possible to obtain a predetermined drying rate throughout the entire drying process. Furthermore, the lower the outside air temperature is, the more exhaust air can be returned to the burner (3), so the burner (3) is less likely to be cooled by the low outside air, resulting in better combustion conditions.

Embodiment In the illustrated example, the shelf wall of the dryer (10) has a rectangular shape in a plan view that is long in the front and back direction, and consists of one front and rear wall plate (11), (11) and left and right wall plates (12), (12). The upper part of this m-wall has ceiling plates (13), (13), and the front wall plate (!l
) is configured such that an operation box (14) is detachably attached thereto.

The operation box (14) is box-shaped, and has a start switch (15), a stop switch (TE), various notches (17), etc. on the surface, and an outside temperature sensor for detecting outside air temperature on the bottom. It has a detection sensor (8) and an electric circuit inside.

A lower helical transfer gutter (18), which is located in the center of the shelf wall and has a U-shape when viewed from the front and extends in the front-rear direction, is provided, and a grain collection room (which is V-shaped when viewed from the front) is provided above the lower helical transfer gutter (18). 19) are provided and communicated with each other, and above this grain collection room (13), four drying chambers (2) are arranged vertically between the left and right ventilation net plates and communicated with each other,
A delivery valve (20) is provided at the bottom of this drying chamber (2). An inclined plate is provided above each of the ventilation mesh plates, a partition plate is provided below, and the outer drying chamber (2) and the inner drying chamber (2) are separated.
A box-shaped hot air duct chamber (21) is provided in the front wall plate (11), and a hot air duct chamber (21) is provided in the front part of the hot air duct chamber (21). is provided with a burner case (22), a burner (3) is provided built-in in this burner case (22), and this burner (3) and the hot air chamber (5), (5) are installed.
The hot air passage chamber (21) communicates with the hot air passage chamber (21). The outer drying chamber (2), (2) and the left and right wall plates (12), (1
2) and the inner drying chambers (2), (2) are formed with ventilation chambers (6), (6), (6), and the rear wall plate (
An exhaust duct room (23) is provided in the section 11), and this exhaust duct room (
23) An exhaust fan (4) is provided at the rear, and this exhaust fan (4)
and the ventilation chambers (6), (6), (6) refer to the ventilation duct chamber (2).
3). A cylindrical exhaust return path chamber (7) is provided which communicates between the upper part of the exhaust fan (4) and the upper part of the burner case (22) and passes through the upper part of the exhaust chamber (6) in the center. An exhaust air temperature detection sensor (9) for detecting the temperature of the exhaust air discharged by the exhaust air m (4) is provided to protrude inward from the upper part of the exhaust fan (4). A rotatable shaft (24) is provided in the exhaust air return path chamber (7) on the burner case (22), and a valve (25) is fixed to this shaft (20). A motor (26) is provided on the outside of the chamber (7), and the motor (26) and the shaft (24) are connected to each other to detect the outside air temperature detected by the outside air temperature detection sensor (8) and the exhaust air temperature. The motor (26) rotates in response to an electrical signal from the operation box (14) in conjunction with the difference in exhaust air temperature detected by the sensor (9), and the valve (25) is rotated by the motor (26). ) rotates to open the exhaust air return path chamber (7).
) is open.

A part of the exhaust air discharged by the exhaust fan (4) is returned to the burner (3) section through the exhaust air return path chamber (7), and each detection sensor (8), ( The opening state of the valve (25) changes depending on the temperature difference detected by 9), and the amount of exhaust air to be reduced changes.For example, when the outside air temperature is low, the exhaust air temperature is high, and this temperature difference is large, the reduction is performed. The configuration is such that the amount of exhaust air increases, and when the difference is small, the amount of exhaust air to be returned decreases. There is a storage chamber (1) above the drying chamber (2).
and the ceiling plate (13) above the storage chamber (1).
, (13) is provided with an upper helical transfer gutter (27);
A supply port for supplying the transferred grains into the storage chamber (1) is opened in the center of the upper helical transfer gutter (27), and a diffusion plate (28) is provided at the bottom of the supply port. 28)
The structure is such that the grains are evenly diffused and returned into the storage chamber (1).

The grain raising machine (28) is removably attached to the front part of the front wall board (11), and a packet conveyor (30) belt is stretched between the upper and lower boars inside, and the upper end and the upper helical conveyor are connected to each other. A discharge tube (31) is provided between the starting end of the gutter (27) for communication, and a supply gutter (32) is provided for communication between the lower end and the terminal end of the lower helical transfer gutter (18). I'm letting you do it.

The hot air generated from the burner (3) installed at the front of the hot air duct chamber (21) on the front wall plate (11) is transferred to the exhaust fan ( 4), the drying chamber (2) is cross-ventilated from the hot-air chamber (5), and the grains accommodated in the dryer (10) are transported to the drying chamber (2).
), it is exposed to this hot air and dried, and is delivered to the lower part by the delivery valve (20), and is sent to the lower helical transfer gutter (
18) into the feed gutter (32), and the grain raising machine (2
9), is transported to the upper part by the upper helical transfer gutter (27), and is transferred and supplied onto the diffusion plate (28), where it is evenly diffused and returned into the storage chamber (1), and is circulated and dried. When the grains reach the specified moisture content, the drying process (1G) is automatically stopped under automatic control using the operation box (14), but an outside air temperature detection sensor (8) detects the outside air temperature during this drying operation. detects the outside air temperature, the exhaust air temperature detection sensor (9) detects the exhaust air temperature which is sucked and exhausted by the exhaust air II (4), and compares the detected outside air temperature and the exhaust air temperature. The operation box (14) electrically compares the temperature, and in conjunction with this temperature difference, the electric signal from the operation box (14) rotates the motor (2B), and the shaft that drives the frontispiece at the same time as this motor (26). (24) rotates, and the exhaust return path chamber (7)
The valve (25) inside is opened, and a part of the exhaust air sucked and exhausted by the exhaust fan (4) is returned to the burner (3) through the exhaust air return path chamber (7), This reduced exhaust air and the hot air generated from the burner (3) are simultaneously drawn into the hot air chamber (5), and are passed through the drying chamber (2) to dry the grains. Also, the lower the detected outside air temperature is, the higher the exhaust air temperature is, and the greater the difference in temperature, the greater the opening state of the valve (25) and the greater the amount of exhaust air to be reduced.On the contrary, if the temperature difference is small, the amount of exhaust air to be reduced is The valve ('25) is automatically adjusted to a state where the amount of air is reduced, the amount of returned exhaust air is adjusted, and the grains are dried.

The amount of reducing exhaust air is automatically adjusted and reduced depending on the difference between the outside air temperature and the exhaust air temperature, and when the outside air temperature is low, more exhaust air is returned, so the drying rate is always stable regardless of the outside air temperature. It also saves energy because the exhaust air is used as drying heat.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway side view, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig.
The figure is a front view of a part of it. In the figure, code (1) is the storage chamber, (2) is the drying chamber, (3) is the burner, (4) is the exhaust fan, (5) is the hot air chamber, (6) is the exhaust chamber, and (7) is the In the exhaust air return path room, (8) indicates an outside air temperature detection sensor, and (9) indicates an exhaust air temperature detection sensor.

Claims (1)

[Claims] It has a storage chamber (1) at the top and a drying chamber (2) at the bottom, with a burner (3) at the front of this drying chamber (2) and an exhaust fan (4) at the rear.
The hot air generated by the burner (3) is transferred to the hot air chamber (5).
The drying chamber (2) is ventilated across the drying chamber (2), and the air is suctioned and discharged through the exhaust chamber (6) to the exhaust fan (4), and the exhaust fan (4) and the burner (3) are communicated with each other. an exhaust air return path chamber (7) that returns a part of the exhaust air, an outside air temperature detection sensor (8) that detects the outside air temperature, and an exhaust air return path chamber (7) that detects the temperature of the exhaust air sucked and exhausted by the exhaust fan (4). A wind temperature detection sensor (9) is provided, and the exhaust air return path chamber (7) is determined in relation to the difference between the exhaust air temperature detected by the detection sensor (9) and the outside air temperature detected by the detection sensor (8). A grain dryer comprising a control device for controlling the amount of exhaust air to be returned to the burner (3) section through the air.