JPH1151563A - Exhauster for grain drying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain stable dying work by building an exhauster of a grain drying machine on a centrifugal fan to secure the straightening of an exhaust air flow shortening the overall length thereof. SOLUTION: In an exhauster of a grain drying machine which comprises a centrifugal fan 30 mounted on the wall of a machine to rotate at a high speed, a fan shell 31 containing the fan 30, an exhaust duct 32 and the like, a bell mouth-shaped guide part 34 is provided at an inlet part of the fan shell 31 facing an exhaust chamber. The centrifugal fan 30 is arranged in parallel with the guide part 34 and a plurality of blades 36, 36... are arranged at specified angles centered on a rotating 35 to be built as a one-side suction centrifugal fan 30. The fan shell 31 is so built that air is generated in the centrifugal fan 30 with the rotation thereof to release air upward from an circular opening 32. An exhaust duct 32 is connected to the fan shell 31 and a guide part inside the exhaust duct 32 is so formed as to be slightly changed in a direction toward the non-existing side of the bell mouth-shaped part 34 from the existing side thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust device for a grain dryer.

[0002]

2. Description of the Related Art When connecting an air exhaust device leading to an exhaust air chamber, an axial fan has conventionally been used, so that the longitudinal length has tended to be increased.

[0003]

SUMMARY OF THE INVENTION The present invention employs a centrifugal fan to shorten the front-rear length of a dryer, and also attempts to secure rectification. The centrifugal fan is mounted on the machine wall 1 and rotates at a high speed. In an exhaust device of a grain dryer including a fan 30, a fan body 31 incorporating the fan, and an exhaust duct 32, a fan body 31 looking into the exhaust chamber 8 is provided.
A bell mouth-shaped guide portion 34 is provided at the entrance, and a centrifugal fan 30 is arranged in parallel with the guide portion 34, and a plurality of blades 36, 36. The fan body 30 is configured so that the centrifugal fan 30 generates wind with rotation and discharges air from the circular opening 32 upward, and an exhaust duct 32 is connected to the fan body 31. The guide portion inside the wind duct 32 is formed so as to slightly change the direction from the existing side of the bell mouth-shaped guide portion 34 to the non-existent side.

[0004]

Now, the air flow will be described. The swirling flow of the centrifugal fan 30 is directed upward, but the guide body of the intermediate duct 32a is positioned from the existing side of the bellmouth-shaped guide section 34 to the non-existent side. Therefore, the swirling flow swirling around the outer periphery of the guide portion 34 is gradually changed in the direction, and can be combined with the entire swirling flow, and in addition, the cross-sectional area is gradually enlarged. Therefore, rectification can be obtained as a whole in the intermediate duct 32a.

The intermediate duct 32a is connected to the guide 3
4 is formed so as to slightly change the direction from the existence side to the non-existence side with a rectangular cross section, so that it is possible to bypass the projecting portion of the machine wall, for example, the joining flange portion of the tank portion, which is advantageous in assembling. .

[0006]

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a machine frame of a grain dryer, in which a storage tank 2, a drying room 3, and a grain collecting room 4 are vertically installed from above, and the drying room 3 is a burner having a burner 5. Grain downflow passages 9, 9 are formed in a V-shape between a hot air chamber 6 communicating with the body and an exhaust air chamber 8 communicating with an exhaust device 7, and a feeding drum provided below each of the downflow passages 9, 9 The structure is such that hot and cold air is blown on the grains flowing down at predetermined intervals by the forward and reverse rotations of 10 to dry the grains.

A grain raising machine 11 is provided outside the machine casing 1 for lifting and returning the grains collected on one side of the grain collecting chamber 4 to a storage tank 2. The grain raising machine 11 has a pair of internal and
A belt 14 with a bucket 13 is wound between the pulley and the driven pulley, and the dried grains transferred to one side by a lower transfer spiral 15 provided horizontally below the grain collecting chamber 4 can be scooped and transferred to the upper part. It has a configuration. Grains scooped up by the grain raising machine 11 and thrown at the upper portion are guided to the start end side of a transfer gutter 18 provided with an upper transfer spiral 17 through a throw opening 16. The grains horizontally transferred by the transfer spiral 17 are guided to a rotary diffusion plate 19 arranged at the upper center of the storage tank 2,
It is configured to be diffused and dropped into the storage tank 2.

The grain raising machine 11, upper and lower transfer spirals 1
The grain circulating system consisting of 5 and 17 has a drive motor in the lower corner of the machine frame.
The rotation is interlocked with the table 20. The drive shaft of the motor 20 is linked with the rotation of the shaft 22 of the lower transfer spiral 15 via a counter pulley 21.
And the upper transfer spiral 16 can be interlocked.

The feeding drum 10 is a drum motor 2
3 is a configuration for interlocking forward and reverse rotation. The grain raising machine 1
1, a supply port 25 is provided on the side wall 24 at an appropriate height position so as to correspond to a position within the left-right space between the forward stroke A and the return stroke B of the bucket belt 14, and the supply port 25 has a moisture meter. 26 is provided detachably. The moisture meter 26 is configured, for example, to crush one sample grain between a pair of electrode rolls and electrically process the resistance value to convert it into a grain moisture value.

An exhaust device 7 is provided on the back side of the machine frame 1.
The exhaust device 7 includes a centrifugal fan 30 that rotates at a high speed, a fan body 31 containing the fan, an exhaust duct 32, and the like. A circular opening 33 is formed in the back of the machine frame 1 to be viewed in the exhaust chamber 8, and a bell mouth-shaped guide portion 34 is provided at the entrance of the fan body 31. A centrifugal fan 30 is provided in parallel with the guide portion 34, and a plurality of blades 3
Are arranged at a predetermined angle to constitute a one-sided suction centrifugal fan 30. Further, the fan body 31 is configured so as to generate wind with the rotation of the centrifugal fan 30 and discharge air from the circular opening 32 upward. The fan duct 31 has an intermediate duct 3
An exhaust duct 32 composed of 2a and a final duct 32b is connected. The lower part of the intermediate duct 32a is the fan body 31.
In the connection part with the above, the opening part is a rectangular opening part, while the upper part is a circular upward opening part. The guide portion inside the fan body 31 is formed so as to slightly change its direction with a rectangular cross section from the existing side to the non-existent side of the bell mouth-shaped guide portion 34, and gradually has a sectional area from the joint portion with the intermediate duct 32a. While expanding to reach the upper circular opening.

The final duct 32b has a circular cross section and is formed in an elbow shape so as to convert the air flow from an upward direction to a lateral direction. The intermediate duct 32a is loosely fitted and is configured to swing freely around the center of the vertical axis based on the intermediate duct 32a. A pulley 37 is provided at the outer end of the rotating shaft 35, and a belt 38 is looped between a second counter pulley 21 a provided integrally with the counter pulley 21 and the pulley 37, and is linked to the drive motor 20. I have.

The bell-mouth-shaped guide portion 34 can be obtained by burring the wall of the dryer. In this case, the fan body 3 is
1 is mounted on the wall of the dryer, so that the cost can be reduced without any special guide member. FIG. 5 is a control block diagram. The control unit 41 of the controller 40 includes:
Mode switches 43, 44, 45, and 46 for setting, drying, discharging, and stopping provided on the operation panel 42, and setting switches 4 for setting drying, setting moisture, and setting amount for selecting a grain type.
7, 48, 49, input signals of the increase / decrease switches 50, 51 for setting the drying time, etc., as well as the moisture meter 26, the frame rod 52, the hot air temperature sensor 53, the outside air temperature sensor 54, the air volume sensor 55, etc. Input various detection signals. On the other hand, as the output signal, there are a circulating system drive motor drive signal of the drive motor 20, the drum motor 23 and the like, a burner 5 drive signal and the like.

The drum motor 23 is controlled and output so as to intermittently drive forward and reverse. That is, the feeding drum 10 having a cylindrical drum-shaped notch having a predetermined width and having an opening is rotated forward to reach a position where the opening is directed downward, and is immediately reversed 360 degrees to turn the opening downward again. The movement is controlled and output to the drum motor 23 in order to execute this movement at predetermined time intervals.

The control unit 41 has the following functions.
That is, when it is determined by the detection signal processing from the moisture meter 26 that the control unit 41 has reached the finish moisture, a stop signal is output. Upon receiving this stop signal, the circulation motor 20, the drum motor 23, or the burner 5 stops its operation. The operation of the above example will be described.

A predetermined amount of grains is set in the storage tank 2 from the setting hopper using the grain raising machine 11. Next, the grain type,
The drying operation is started after setting the finish moisture and the like. When the drying switch 44 is turned on, the burner 5, the motors 20 and 23 are turned on.
The driving signal is output to When the motor 20 is driven, the lower transfer spiral, the elevator, the upper transfer spiral, the diffuser, and the centrifugal fan 30 are rotated and interlocked. Therefore, the hot air from the burner 5 flows through the inside of the machine frame 1 due to the wind generated by the rotation of the centrifugal fan 30. The drive drum 23 rotates the feeding drum 10 in a forward / reverse direction, so that the grains accumulated in the drum 10 are discharged to the lower transfer spiral, and the grains in the downflow passage are caused to flow down. Therefore, the grains in the storage tank 2 are subjected to hot air while flowing down the drying chamber 3 and reach the grain collecting chamber 4. The grains that have received the hot air are transported to one side by the lower transport spiral,
At 1, the grain is fried, taken over by the upper transfer spiral 16, again reaches the storage tank 2, and undergoes the refining action for a while. When such a process is repeated and the finish moisture value reaches a preset value, the drying is completed.

By the way, as the centrifugal fan 30 rotates,
Exhaust air is sucked from the circular opening 32 of the machine frame 1 and discharged upward. And the intermediate duct 31a and the final duct 31
After that, it is discharged outside the machine. Here, the air flow will be described. The swirling flow of the centrifugal fan 30 is directed upward, but the guide trunk of the intermediate duct 32a changes its direction slightly from the existing side of the bellmouth-shaped guide section 34 to the non-existent side. Therefore, the swirling flow swirling around the outer periphery of the guide portion 34 is gradually converted in the direction,
Since it can be combined with the entire swirling flow and the cross-sectional area is gradually enlarged, rectification can be obtained as a whole in the intermediate duct 32a.

The intermediate duct 32a is connected to the guide 3
4 is formed so as to slightly change the direction from the existence side to the non-existence side with a rectangular cross section, so that it is possible to bypass the projecting portion of the machine wall, for example, the joining flange portion of the tank portion, which is advantageous in assembling. . The moisture meter 26 includes a single grain feeding section 61, a pair of electrode rolls 62, a drive motor 63, a gear interlocking section 64, a control circuit board 65, and the like inside. Various control circuits, such as a moisture value calculation control unit and a data signal output unit, are formed on the circuit board 65.
, A weak electric circuit up to several volts is collectively constituted. On the other hand, the high-power section represented by the motor transformer 66 is configured to be supported at a position away from the board 65, for example, on a bottom plate 67 between the motor 63 and the control board 65. Reference numeral 68 denotes a controller 40 including the control unit 41.
And a harness for connecting a control circuit on the control board 65 of the moisture meter 26 and the motor transformer 66, wherein openings 69 and 70 are formed at substantially the same height before and after the elevator 5, and the elevator 5 A tunnel-shaped through-bore 71 having a rectangular cross section is provided in front of and behind the elevator 5 so as to correspond to the openings 69 and 70. By passing the harness 68 through the tunnel-shaped penetrating cylinder 71 in this manner, one end of the harness 68 is connected to a nearby controller and the other end is viewed inside the moisture meter, and is removably connected to the control circuit board 65 and the like. Becomes According to the above configuration, the moisture meter 2 of the elevator 5
6 Harnesses cannot be seen on the existence side, so that appearance is not impaired and rat harm can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part in which a part is sectioned.

FIG. 2 is a front view of a dryer main body.

FIG. 3 is a front sectional view of a dryer main body.

FIG. 4 is a rear view of a main part.

FIG. 5 is a control block diagram.

FIG. 6 is a front view of the operation panel surface.

FIG. 7 is a front sectional view of the moisture meter.

FIG. 8 is a side sectional view of the moisture meter.

[Explanation of symbols]

1 ... machine frame, 2 ... storage tank, 3 ... drying room, 4 ... grain collection room,
5 burner, 6 hot air chamber, 7 suction fan, 8 exhaust air chamber, 9, 9 grain flow passage, 10 feeding drum, 11
Grain raising machine, 13 ... bucket, 14 ... bucket belt, 15
... lower transfer spiral, 16 ... throw opening opening, 17 ... upper transfer spiral, 18 ... transfer gutter, 19 ... rotating diffuser, 20 ... drive motor, 21 ... counter pulley, 22 ... lower transfer spiral shaft,
23: drum motor, 24: side wall, 25: supply port, 26
... moisture meter, 27 ... outlet, 30 ... centrifugal fan, 31 ... fan body, 32 ... exhaust duct, 33 ... circular opening, 34 ... guide part, 35 ... rotating shaft, 36, 36 ... blade, 37 ... pulley, Reference numeral 38: belt, 40: controller, 41: control unit, 42: operation panel, 43: insertion switch, 44: drying switch, 45: discharge switch, 46: stop switch, 4
7 ... Grain type setting switch, 48 ... Finish moisture setting switch, 49 ... Spread amount setting switch, 50, 51 ... Increase / decrease switch, 52 ... Frame rod, 53 ... Hot air temperature sensor, 54 ... Outside air temperature sensor, 55 … Airflow sensor, 61…
Single grain feeding section, 62: electrode roll, 63: motor 63, 6
4 gear interlocking section, 65 control circuit board, 66 motor transformer, 67 bottom plate, 68 harness, 69, 70 opening, 71 tunnel through cylinder

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Takashi Uehara 1st Hachikura, Toze-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. (72) Inventor Masashi Yumitate 1st, Hachikura, Tobe-cho, Toyo-cho, Iyo-gun, Ehime Prefecture Technology In-house (72) Inventor Katsunori Kono 1-Engine, Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] 1. An exhaust device for a grain dryer, comprising a centrifugal fan 30 mounted on the machine wall 1 and rotating at a high speed, a fan body 31 incorporating the fan, an exhaust duct 32, and the like. A bell mouth-shaped guide portion 34 is provided at the entrance of the fan body 31 to be viewed, and the centrifugal fan 30 is arranged in parallel with the guide portion 34 and a plurality of blades 36, 36. The centrifugal fan 30 is configured as a one-sided suction fan, and the fan body 31 is configured to generate air as the centrifugal fan 30 rotates as it rotates and discharge air from the circular opening 32 upward. The fan body 31 is connected to an exhaust duct 32. The guide portion inside the exhaust duct 32 is formed so as to slightly change the direction from the existing side of the bell mouth-shaped guide portion 34 to the non-existent side thereof, and the exhaust air in the grain dryer is characterized in that apparatus.