JPH03199884A - Control of drying in grain dryer - Google Patents

Abstract

PURPOSE:To improve dehumidifying efficiency and prevent grains from being exposed to dehumidifying air more than it is necessary by a method wherein the number of rotation of a compressor for a dehumidifying device is controlled by the amount of grains to be dried and three divisions of atmospheric temperature, including a set temperature range as well as the upper and lower limits of the temperature out of said temperature range, to control the amount of dehumidifying air. CONSTITUTION:When an atmospheric temperature, detected by an atmospheric temperature sensor 39, is within the range of set and stored temperature of 13-33 deg.C, for example, during dehumidifying and drying operation, the number of rotation of a compressor 4 for a dehumidifying device 2 is controlled by a drying control device 45 within the set and stored range of number of rotation based on the amount of charging of grains, which is detected by a charging amount sensor 14. When an atmospheric temperature sensor 39 has detected an atmospheric temperature, higher than the high temperature of 33 deg.C which exceeding the set temperature range, or when the atmospheric temperature is lower than the low temperature of 13 deg.C under the number of rotation of the compressor at a predetermined low speed rotation exceeding a set range of number of rotation, the compressor 4 is controlled by the drying control device 45 so as to keep a predetermined high-speed rotation whereby the amount of dehumidifying air, generated by the dehumidifying device 2, is controlled and the grains are dried.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a drying control method for a grain dryer.

Conventional technology Conventionally, grains in a grain drying chamber are dried by passing dehumidifying air from a dehumidifier into the drying chamber and sucking and exhausting the grains with an exhaust fan. The rotational speed of the compressor was selected and controlled within a set rotational speed range, and this drying control method was used in which the dehumidifying air was controlled and the grains were dried.

Problem to be Solved by the Invention The number of revolutions of the compressor of the dehumidifier is selected within a set number of revolutions depending on the amount of grains to be dried for the grains stored in the grain drying chamber. Dehumidified air with a predetermined temperature and humidity is generated from the dehumidifier by controlling the rotation speed, and this dehumidified air passes through the drying chamber and is sucked and exhausted outside the machine by the exhaust fan. The grains in the drying chamber are exposed to this dehumidified air and dried.

During this dehumidifying and drying work, the dehumidifying air generated from the dehumidifying device is controlled depending on whether the detected outside air temperature is within or outside the set temperature range and the amount of grain to be dried, etc. This is an attempt to improve the taste of the grains.

Means for Solving the Problems This invention provides a method for drying grains in a grain drying chamber 1 by blowing dehumidifying air from a dehumidifying device 2 into the grain drying chamber 1 and sucking and exhausting the grains with an exhaust fan 3. In the grain dryer, when the outside air temperature to be detected is within the set temperature range, the rotation speed of the compressor 4 of the dehumidifier 2 is controlled within the set rotation speed range based on the amount of grains to be dried, and the outside air temperature to be detected is further controlled. When the temperature of the compressor 4 is high and exceeds the set temperature range, the rotation speed of the compressor 4 is controlled to a low speed that exceeds the set rotation speed range, and when the detected outside air temperature is low and exceeds the set temperature range, the rotation speed of the compressor 4 is controlled to a low speed that exceeds the set temperature range. The drying control method is characterized in that the rotational speed of the compressor 4 is controlled to a high rotational speed exceeding the set rotational speed range, and the dehumidifying air is controlled for drying.

Effect of the Invention The grains stored in the grain drying chamber 1 of the grain dryer are processed by controlling the rotation speed of the compressor 4 of the dehumidifying device 2.
The dehumidified air generated from the drying chamber 1 passes through the drying chamber 1 and is sucked and exhausted to the outside by the exhaust fan 3, so that the grains in the drying chamber 1 are exposed to this dehumidified air and dried.

During this dehumidifying and drying work, the dehumidifying air is controlled as described below depending on the amount of grains to be dried and the detected outside air temperature.

When the detected outside air temperature is within the set temperature range, the rotation speed of the compressor 4 of the dehumidifier 2 is controlled within the set rotation speed range depending on the amount of grains to be dried, and the dehumidification generated from the dehumidifier 2 is controlled. The grains are dried by controlling the wind, and when the detected outside air temperature exceeds the set temperature range, the rotation speed of the compressor 4 is set to a predetermined low speed rotation that exceeds the set rotation speed range. The dehumidifying air generated from the dehumidifying device 2 is controlled to dry the grains, and when the outside air temperature is detected to be low, exceeding the set temperature range, the compressor 4 is The rotation speed is controlled to a predetermined high speed rotation exceeding the set rotation speed range, and the dehumidifying air generated from the dehumidifying device 2 is controlled to dry the grains.

Effects of the Invention According to the present invention, dehumidifying air is controlled by controlling the rotation speed of the compressor 4 of the dehumidifier 2, but the amount of grains to be dried and the detected outside air temperature are within the set temperature range and the temperature outside the range. By controlling the dehumidifying air according to the three categories of upper and lower limits,
Even when the outside air temperature is particularly low or high, by controlling the dehumidifying air according to the outside air temperature, the dehumidifying capacity of the dehumidifying device 2 is properly controlled, improving efficiency, and reducing the amount of air that exceeds the required level. An embodiment in which the grains are not exposed to dehumidified air with low humidity and high temperature, and thus the taste is improved do.

This dryer 5 has a rectangular shape that is long in the front and back direction, and has a transfer gutter 7 and a ceiling plate 8 equipped with a rotatable transfer spiral at the upper end of the machine wall 6, and the lower side of the ceiling plate 8 is used to store grains. A storage chamber 9 for storing grains is formed, and grain drying chambers 1 are provided below the storage chamber 9 between ventilation chambers 10 on the left and right outer sides and a ventilation chamber 11 in the center. At the bottom of each drying chamber 1, there is a feed valve 1 that feeds out the grains and allows them to flow down.
2 is rotatably supported on a shaft, and a grain collecting trough 13 rotatably equipped with a transfer spiral is provided below each drying chamber 1 to communicate with the grain collecting trough 13. Forward machine wall 6
The inner wall is provided with a plurality of pressure switch-type loading amount sensors 14 for detecting the amount of grain loaded into the storage chamber 9 at appropriate intervals in the vertical direction.

The front machine wall 6 is provided with an operating device 15 for starting and stopping the dehumidifying device 2 and the dehumidifying device 2 and the dryer 5 for each operation of loading, drying, and discharging.
and the ventilation chamber 11 are configured to communicate with each other, and an exhaust passage chamber 16 is formed on the rear side of the rear machine wall 6.
An exhaust fan 3 and a variable speed exhaust fan motor 17 for rotating the exhaust fan 3 at variable speeds are provided on the rear side, and the exhaust fan 3 and each of the exhaust chambers 10 communicate with each other via the exhaust path chamber 16. A valve motor 19 for rotationally driving the delivery valve 12 via a deceleration mechanism 18 is provided at the lower part of the rear machine wall 6.

At the center of the bottom of the transfer gutter 7 is the storage chamber 9 for transferring grains.
A supply port for supplying the grains into the storage chamber 9 is provided, and a diffusion plate 20 is provided below the supply port to uniformly diffuse and return the grains into the storage chamber 9.

The grain raising machine 21 is provided in the front part of the front machine wall 6, and a packet conveyor 22 belt is stretched inside, and a discharging cylinder 23 is provided between the upper end and the starting end of the transfer gutter 7 for communication. let me,
A supply gutter 24 is provided between the lower end and the terminal end of the grain collection gutter 13 for communication.

A grain hoist motor 25 provided on the upper part of the grain hoist 21 rotates the belt of the packet conveyor 22, the transfer spiral in the transfer gutter 7, the spreading plate 20, etc. The transport spiral is configured to be rotationally driven via the packet conveyor 22 belt, and a moisture sensor 26 for detecting grain moisture is provided at approximately the center in the vertical direction.
This moisture sensor 26 detects grain moisture by transmitting an electrical measurement signal from the operating device 15, and a moisture motor 27 built into this moisture sensor 26 rotates, and each part of this moisture sensor 26 is rotationally driven. It is the composition.

The dehumidifier 2 has a box shape, and the front wall plate of the box body is provided with an inlet 28 for sucking outside air, and the rear wall plate is provided with an inlet 28 for sucking outside air into the dehumidifier 2. The configuration includes an air outlet 29 for blowing the converted dehumidified air into the air blowing chamber 11, and in order to convert the outside air sucked into the dehumidifying device 2 into dehumidified air, a low-temperature, low-pressure refrigerant is used. The gas is adiabatically compressed into high-temperature, high-pressure gas in the compressor 4, and when it passes through the condenser 30, it loses heat and changes into a high-temperature, high-pressure liquid.Then, the pressure is reduced to a low-temperature, low-pressure liquid in the expansion valve 31, and then When passing through the evaporator 32, the refrigerant absorbs heat and changes into low-temperature, low-pressure gas, and as the refrigerant sequentially repeats this cycle,
The structure is such that the outside air passing through the dehumidifier 2 is exchanged with dehumidified air.

Note that the condition of the outside air sucked into the dehumidifier 2 is as follows:
As it passes through the 32 parts of the evaporator, it is cooled and moisture in the air condenses, resulting in low-temperature, low-humidity air with reduced absolute humidity.Then, as it passes through the 30 parts of the condenser, it absorbs heat and has a temperature slightly higher than room temperature. The compressor 4 is configured to obtain dehumidified air with a low temperature, and the compressor 4 is configured to be rotationally driven at variable speeds by a variable speed compressor motor 33 that rotates at variable speeds. By being controlled, the dehumidifying capacity of the compressor 4 is controlled, and the dehumidifying air generated from the dehumidifying device 2 is controlled, and a heater 46 is provided to auxiliary heat the dehumidifying air. Further, a flow control device 47 may be provided to control the flow speed of the refrigerant to control the dehumidifying air by controlling the flow speed of the refrigerant.

The operating device 15 has a box shape, and the surface plate of the box has a
A start switch 34 for starting the dryer 5 and the dehumidifying device 2 for each operation of loading, drying, and discharging; a stop switch 35 for stopping the dryer 5 and the dehumidifier 2; and a moisture setting switch for setting the finishing target moisture content of grains depending on the operation position. A display window 38 and a monitor display are provided on the outside of the bottom plate to alternately display the detected grain moisture, detected drying temperature, remaining drying time, etc. is a configuration in which an outside air temperature sensor 39 and an outside air temperature sensor 48 are provided to detect outside air temperature and outside air humidity. Input circuits 4 and 42 into which the converted values and various manual values are input, CP and U 43 which perform arithmetic and logical operations, comparison operations, etc. on these input values;
The structure includes a drying control device 45 including an output circuit 44 and the like that receives various commands from 3 and outputs them.
The setting controls 36 and 37 are of a rotary switch type, and are configured to set predetermined values and types depending on the operating position.

Drying control of grains by the drying control device 45 is performed as follows. When the moisture setting switch 36 is operated, this operation is input to the CPU 43, and the finishing target moisture of the grains is set by this input. and the moisture sensor 26
The grain moisture detected by the CPU 43 is inputted to the CPU 43, and the input detected grain moisture and the set finishing target moisture are compared, and if the detected grain moisture is found to be the same as the finishing target moisture, this The drying device 45 automatically controls the dryer 5 to automatically stop the drying of the grains.

The loaded amount sensor 14 detects the loaded amount of grains loaded into the storage chamber 9, and this detected loaded amount is sent to the CPU 43.
When the outside air temperature detected by the outside air temperature sensor 39 is within the range of 13°C to 33°C, the CPU 43
As shown in FIG. 3, the rotation speed of the compressor 4 of the dehumidifier 2 is selected within the range set and stored in the CPU 43 based on the detected filling amount and the detected outside air temperature. The rotation speed of the compressor motor 33 that rotates the compressor 4 is controlled so that the selected rotation speed is achieved.For example, when the detected outside air temperature is 13° C. within the set temperature range, When it is detected that the temperature is 25°C between 33°C and 800 kg, which is the minimum installed amount, the pressure f! The rotation speed of the compressor 4 is selected as the standard rotation speed (α) x 0°8 of this compressor 4, and when the detected filling amount is 4000 kg, which is the maximum biting amount, the rotation speed of the compressor 4 is is selected as the standard rotation speed (α) The rotation speed of the compressor motor 33 is controlled to increase or decrease by the drying control device 45 so that the rotation speed of the compressor 4 becomes 0.8 (α), 1.2 (α), and 1,0 (α). If the outside temperature is within the set temperature range, the rotation speed of the compressor 4 will vary from 0.8 (α) to 1.2 depending on the amount of grain loaded.
This is a configuration that is controlled within the range of (α).

When the outside air temperature sensor 39 detects a low temperature of 13° C. or lower exceeding the set temperature range of 13° C. to 33° C. and inputs the detected temperature to the CPU 43, the filling amount sensor 14 detects this. Regardless of the amount of packed grain, the rotation speed of the compressor 4 is selected as the standard rotation speed (α)Xi, 3 of the compressor 4, as shown in FIG.
．． The number of rotations of the compressor motor 33 is controlled to be increased by the drying control device 45 so that the number of rotations of the compressor 4 becomes 3(α), and the outside air temperature sensors 31 2 9 are The outside temperature to be detected is within the set temperature range of 13℃ to 33℃
When a high temperature of 33° C. or more is detected and input to the CPU 43, the compressor 4 is activated as shown in FIG. The rotation speed of this compressor 4 is selected as the standard rotation speed (α)Xo, 7,
The rotation speed of the compressor motor 33 is controlled to be reduced by the drying control device 45 so that the rotation speed of the compressor 40 becomes 0.7 (α) of the selected rotation speed.

The loaded amount sensor 14 detects the loaded amount of grains loaded into the storage chamber 9, and this detected loaded amount is sent to the CPU 43.
and when the outside air temperature detected by the outside air temperature sensor 39 is within the range of 13°C to 33°C, the CPU 4
3, as shown in FIG. 4, the humidity of the dehumidified air generated from the dehumidifying device 2 is selected within the range set and stored in this CPU 43 based on the detected filling amount and the detected outside air temperature. The flow of the refrigerant is controlled by the flow control device 47 so that the selected humidity is achieved, for example, when the detected outside temperature is within the set temperature range of 13°C to
When it is detected that the temperature is 25℃ between 3℃ and the detected infill amount is 800 kg, which is the minimum infill amount, the humidity of the dehumidifying air is selected as 45%, and the detected infill amount is the maximum infill amount. 4 which is the amount
000 kg, the humidity of the dehumidified air is selected to be 30%, and the flow control device 47 is controlled by the drying control device 45 so that the humidity is the same as the selected humidity. If the temperature is within the set temperature range, the humidity of the dehumidified air is controlled within the range of 30% to 45% depending on the amount of grain packed.

When the outside air temperature sensor 39 detects a low temperature of 13° C. or lower exceeding the set temperature range of 13° C. to 33° C. and inputs the detected temperature to the CPU 43, the filling amount sensor 14 detects this. Regardless of the amount of grain packed, the rotation speed of the compressor 4 is selected as the standard rotation speed (α)Xl, 3 of the compressor 4, as shown in FIG.
．． The rotation speed of the compressor motor 33 is increased and controlled by the drying control device 45 so that the rotation speed of the compressor 4 becomes 3 [α), and the outside air temperature sensor 39 detects When the outside air temperature exceeds the set temperature range of 13°C to 33°C and a high temperature of 33°C or higher is detected and input to the CPU 4.3, the grain tension detected by the tensioning amount sensor 14 is detected. Regardless of the amount of rotation, as shown in FIG. 5, the rotation speed of the compressor 4 is selected as the standard rotation speed (α) ) The rotation speed of the compressor motor 33 is controlled to be decelerated by the drying control device 45 so that the rotation speed of the compressor 40 becomes .).

The loaded amount sensor 14 detects the loaded amount of grains loaded into the storage chamber 9, and this detected loaded amount is sent to the CPU 43.
As shown in FIG. 6, the CPU 43 selects the suction air volume to be sucked and discharged by the exhaust fan 3, which has been set and stored, and the exhaust air is adjusted so that the selected suction air volume is achieved. The rotation speed of the exhaust fan motor 17 that rotationally drives the grains 3 is controlled by the drying control device 45.
When this is detected and input, the suction air volume to be sucked and exhausted by the exhaust fan 3 is selected to be 1.2 rrr/sec, and the CPU 43 is sent to the CPU 43 so that the suction air volume is the selected suction air volume of 1.2 trl'/sec. In order to control the set and memorized rotational speed of the exhaust fan 3 to 2000 r, p, m rotations, the drying control device 45 controls the rotational speed of the exhaust fan motor 17 to 250 or, p, +n rotations. It is configured to control rotation.

Based on the selected suction air volume and the outside air temperature detected by the outside air temperature sensor 39, the CPU 4
The compressor 4 of the dehumidifier 2 is set to 3 and stored.
The rotation speed of the compressor motor 33 that rotationally drives the compressor 4 is controlled so as to be the same as the selected rotation speed. For example, if the suction air volume is 1. .2rn”/sec, and the detected outside temperature is 2rn”/sec.
When 22°C in the range of 0°C to 25°C is detected, the rotation speed of the compressor 4 becomes the standard rotation speed (α)Xl, 1 of the compressor 4.
is selected, and the rotation speed of the compressor motor 33 is controlled by the drying control device 45 so that the rotation speed of the compressor 4 becomes 1.1 (α) of the selected rotation speed. can be,
Further, the rotation speed of the compressor 4 is corrected by the outside air humidity detected by the outside air humidity sensor 48, and the outside air humidity detected by the outside air temperature sensor 48 is, for example, 70%. Then, based on this detected outside air humidity, the correction value set and stored in the CPU 43 is selected as 1.1, as shown in FIG. , the selected correction value 1.1 is used to correct the rotation speed to 1.21 (α), which is 1.1 (α) x 1. l=1.21
(α) The rotation speed of the compressor motor 33 is controlled by the drying control device 45 so that the rotation speed of the compressor 4 becomes the corrected rotation speed of 1, 21 (α). .

During the grain dehumidification and drying operation, any one of the above-mentioned controls is performed.

Hereinafter, the operation of the above embodiment will be explained.

By operating each setting switch 36, 37 of the operating device 15 to a predetermined position and operating the start switch 34 that starts dehumidifying and drying work, each part of the grain dryer 5, the dehumidifying device 2, the moisture sensor 26, etc. When the dehumidifying device 2 starts, dehumidified air is generated, and this dehumidified air passes through the air outlet 29, the air chamber 11, the grain drying chamber 1, the air exhaust chamber 10, the air exhaust path room 16, and then the air exhaust fan. 3, the grains stored in the storage chamber 9 are exposed to the dehumidified air while flowing down from the storage chamber 9 into the drying chamber l, and are dried. The grains are fed out and flowed down from inside the collection gutter 13 to the supply gutter 2.
4, the grain is transferred and supplied into the hoisting machine 21 by the lower transfer spiral, and is conveyed to the upper part by the packet conveyor 22 to the discharging tube 23.
from the transfer gutter 7 onto the diffusion plate 20 via the upper transfer spiral,
When the moisture sensor 26 detects the same grain moisture as the finishing target moisture set by operating the moisture setting knob 36, the operating device Drying of the grains is stopped by automatically controlling the drying control device 45 of 15 to automatically stop the dryer 5.

During this dehumidifying and drying work, if the outside air temperature detected by the outside air temperature sensor 39 is within the range of 13°C to 33°C that has been stored, the grain The dehumidifying device 2
The rotation speed of the compressor 4 is controlled by the drying control device 45 within the set and memorized rotation speed range, and the dehumidifying air generated from the dehumidifying device 2 is controlled to dry the grains. When the outside air temperature detected by the outside air temperature sensor 39 is higher than 33°C, which is higher than the set temperature range, the compressor 4
The drying control device 45 controls the rotation speed to a predetermined low rotation speed exceeding the set rotation speed range, and the dehumidifying air generated from the dehumidifying device 2 is controlled to dry the grains. In addition, when the outside air temperature detected by the outside air temperature sensor 39 is a low temperature of 13° C. or lower, which exceeds the set temperature range, the rotation speed of the compressor 4 is set to a predetermined high speed rotation that exceeds the set rotation speed range. The drying control device 45 controls the dehumidifying air generated from the dehumidifying device 2 to dry the grains.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is a flowchart, and Fig. 3 is a relation between the amount of grain loaded, outside air temperature, and compressor rotation speed. , Figure 4 is a diagram of the relationship between grain loading amount, outside temperature and set humidity, and Figure 5
The figure shows the relationship between the amount of grain loaded, outside air temperature and compressor rotation speed, Figure 6 shows the relationship between the amount of grain loaded and suction air volume, and Figure 7 shows the relationship between suction air volume, outside air temperature and compression Relationship diagram with machine rotation speed,
Fig. 8 is a relationship diagram between outside air humidity and correction value, Fig. 9 is an overall side view of the grain dryer, Fig. 10 is a sectional view taken along line AA in Fig. 9,
FIG. 11 is a rear view of a portion of the grain dryer, and FIG. 12 is a partially cutaway enlarged front view of a portion of the grain dryer. Explanation of symbols 1 Grain drying room 3 Exhaust fan 2 Dehumidifier 4 Compressor

Claims (1)

[Claims] In a grain dryer that dries grains in a grain drying chamber 1 by passing dehumidifying air from a dehumidifying device 2 into the grain drying chamber 1 and sucking and exhausting the grains with an exhaust fan 3, the outside air temperature to be detected is set. When the temperature is within the temperature range, the rotation speed of the compressor 4 of the dehumidifier 2 is controlled within the set rotation speed range based on the amount of grains to be dried, and further when the detected outside air temperature is high beyond the set temperature range. The rotation speed of the compressor 4 is controlled to a low rotation speed exceeding the set rotation speed range, and when the detected outside air temperature is a low temperature exceeding the set temperature range, the rotation speed of the compressor 4 is controlled to the set rotation speed. A drying control method characterized by controlling the dehumidifying air to a high speed rotation exceeding a range for drying.