JP2548457B2 - Dehumidifying dryer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a drying unit for containing grains to be dried, a blowing unit for blowing dehumidified air to the drying unit, and an exhaust unit for discharging the air of the drying unit. A dehumidifying dryer provided.

[0002]

2. Description of the Related Art Conventionally, it has not been taken into consideration whether or not the relationship between the amount of air blown by the air blower and the amount of air blown by the air blower is appropriate.

[0003]

When the blown air volume is larger than the exhausted air volume, the air pressure in the drying section becomes high, so that the air in the drying section leaks from the gap of the casing. As a result, a large amount of dust may be emitted to the outside of the drying section, and it is desirable to reliably avoid such dust emission. On the other hand, when the amount of blown air is considerably smaller than the amount of exhausted air, the atmospheric pressure in the drying unit becomes low, and a large amount of outside air enters the drying unit through the gap between the casings. As a result, the humidity in the drying section becomes high, which may reduce the drying efficiency. An object of the present invention is to obtain a dehumidifying dryer that reliably avoids dust emission and has high drying efficiency.

[0004]

In order to achieve this object, in the first characteristic construction of the dehumidifying / drying machine according to the present invention, the amount of air discharged from the air exhaust means becomes a predetermined amount larger than the amount of air sent from the air blow means. It is configured as follows. A second characteristic configuration is an exhaust air amount detecting means for detecting the exhaust air amount of the exhaust air means, an air blowing amount detecting means for detecting the air blowing amount of the air blowing means, the exhaust air amount detecting means and the air blowing amount detecting means. And an air volume control means for automatically adjusting the air exhaust means or the air blower so that the exhaust air flow rate is larger than the air flow rate by a predetermined amount based on the detection information. A third characteristic configuration includes: a shutoff unit that shuts off the flow of dehumidified air to a part of the drying unit, an input amount detection unit that detects an input amount of grain to the drying unit, and an input amount detection unit. A shutoff control means for operating the shutoff means based on information, and the airflow control means is configured to adjust the exhausted air volume and the blown air volume as the input amount increases. is there.

[0005]

Since the air flow in the drying section is not uniform, the pressure distribution in the drying section is not uniform. Therefore, even if the amount of air discharged by the air exhaust unit and the amount of air sent by the air blowing unit are simply made the same, the disadvantage of dust emission cannot be avoided without fail. Therefore, in the first characteristic configuration, in order to eliminate a portion where the pressure in the drying section is higher than the outside air pressure, the amount of air discharged by the air exhaust unit is set to be a predetermined amount larger than the amount of air sent by the air blowing unit to ensure the discharge of dust. Avoid it. Of course, the predetermined amount may be such that the pressure inside the drying section is higher than the atmospheric pressure, so that
It is possible to avoid entering a large amount of outside air into the drying section as much as possible. With the second characteristic configuration, it is possible to suppress the occurrence of an error in the predetermined amount even when the ventilation resistance changes due to a change in the grain input amount. In the third characteristic configuration, it is possible to suppress the flow of the dehumidified air from concentrating in the space where there is no grain, and to adjust the amount of the flow of the dehumidified air to an appropriate amount according to the input amount of grain.

[0006]

According to the first characteristic structure, the dehumidifying and drying with high drying efficiency can be achieved by appropriately preventing the generation of dust and suppressing the outside air from entering the drying section through the gap of the casing. You can get the opportunity. In the second characteristic configuration,
It is possible to suppress the generation of dust and the reduction in drying efficiency even when the ventilation resistance changes due to a change in the amount of grain input. In the third characteristic configuration, the amount of the flow of dehumidified air can be adjusted to an appropriate amount according to the input amount of grain, so that appropriate drying can be performed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the grain dryer includes a drying unit 1 that stores grains to be dried, a dehumidifying device 2 as a blowing unit that blows dehumidified air to the drying unit 1, and air in the drying unit 1. An exhaust fan 3 as an exhausting means for sucking and discharging, a circulation device 4 for circulatingly moving the grain in the drying section 1, and a control section 5 for controlling each section are provided. The drying unit 1 and the dehumidifying device 2 are connected via a duct 6 for blowing air,
The first drag type as the air flow detection means for the duct 6
An air flow sensor S1, a blower thermometer 37 that measures the temperature of the air flowing through the duct 6, and a heater 38 that heats the air flowing therethrough as needed. Also, the drying section 1
The exhaust fan 3 and the exhaust fan 3 are connected to each other via a duct 8 for exhaust air, and the duct 8 is provided with a drag-type second air flow sensor S2 as exhaust air flow rate detection means.

A storage space K for storing grains for drying is formed inside the drying section 1. The storage space K is
In addition, a plurality of ventilation passages 7 that communicate with the duct 6 for blowing air and the duct 8 for exhausting air are formed. Each ventilation passage 7 is configured by arranging a frame having a mountain shape with an open bottom in a cross-sectional shape. The storage space K is provided with a leveling device 10 that uniformly distributes grains from above, and a rotary valve 12 that discharges grains little by little from the gap between the inclined plates 11. That is, the amount of grain supplied from the equalizer 10 and the amount of grain discharged by driving the rotary valve 12 are balanced. By the way, the dehumidified air from the dehumidifying device 2 is supplied to the ventilation passage 7 via the air supply frame 13 and exhausted to the outside from the ventilation passage 7 via the exhaust frame 14. The air supply frame 13 has a plurality of shutoff valves 1 as shutoff means for selectively shutting off the flow of dehumidified air to a part of the drying section 1.
5 are provided. Then, when the amount of grain input into the drying unit 1 is large and the air passage 7 is full of grains, all of the plurality of shutoff valves 15 are opened, and the amount of grain input into the drying unit 1 is small and the air passage 7 is reduced. When there is almost no grain, the plurality of shutoff valves 15 are all closed, and when the amount of grain input into the drying unit 1 is in the middle of both cases described above, the upper portions of the plurality of shutoff valves 15 corresponding to the amount of grain input are selected. Close one and open the one below. In the figure, 30 is a dust remover, 31 is a full scale for detecting whether or not the grains are fully stored in the storage space K, 32 is a grain thermometer for detecting the temperature of grains,
Reference numeral 33 is a single-grain moisture meter for measuring the moisture of the grain in the drying unit 1.

The inside of the dehumidifying device 2 is divided into upper and lower parts, and a condenser 16 and a first blower fan 17 are provided on the upper part 2A.
In addition, an evaporator 18, a second blower fan 19, and a compressor 20 are provided in the lower portion 2B, respectively, to form a heat pump circuit. The condenser 16 has a function of heating the outside air, and the evaporator 18 has a function of dehumidifying the outside air. Each of the ventilation port 20 that communicates the upper portion 2A and the lower portion 2B and the discharge port 21 of the lower portion 2B has dampers 20A, 21 for adjusting the amount of dehumidified air flowing from the lower portion 2B to the upper portion 2A through the ventilation port 20.
A is provided. Incidentally, these dampers 20A, 21A
Are configured to be opened and closed in a contradictory manner. That is, when one damper 21A is fully closed, the other damper 2
0A is in a fully opened state, and all dehumidified air cooled and dehumidified by the evaporator 18 is added to the upper portion 2A via the ventilation port 20. Further, when the damper 21A is fully open, the damper 20A is fully closed, and all the air that has been cooled and dehumidified by the evaporator 18 is discharged to the outside, and the duct 6
Only the air heated by the condenser 16 is fed into the. In the figure, 34 is a temperature sensor for detecting the dry-bulb temperature of the outside air, and 35 is a humidity sensor for detecting the humidity of the outside air. Although not described in detail, these sensors 34, 3
The opening degrees of the dampers 20A and 21A are determined based on the information of No. 5.

The circulation device 4 pumps the lower screw conveyor 25 that conveys the grain discharged from the storage space K at appropriate intervals by the intermittent drive of the rotary valve 12, and the grain that is conveyed by the lower screw conveyor 25. The elevator 26 and an upper screw conveyor 27 that conveys the grain lifted by the elevator 26 to the leveling device 10 are provided.

The control section 5 comprises a first control section 5A below the drying section 1 and a second control section 5B above the dehumidifying apparatus 2. As shown in FIG. 1, information about each sensor is input to the first control unit 5A and the second control unit 5B. And the first
The control unit 5A controls the exhaust fan 3, the rotary valve 12, and the like. In addition, the second control unit 5B,
Shutoff valve 15, first blower fan 17, second blower fan 19
The dampers 20A, 21A, etc. are controlled. By the way, information on the amount of grain input to the drying unit 1 (eg, grain input weight to the drying unit 1) is also set and input to the second control unit 5B. This input amount information is also transmitted to the first controller 5A via the signal line. To explain the adjustment of the blown air amount and the exhausted air amount, the plurality of shutoff valves 15 are opened and closed based on the input amount information, and the blown air amount and the exhausted air amount are set to increase as the input amount increases.
At this time, the amount of exhaust air is a predetermined amount (here,
Set so that it will increase by 5%). And the first
The exhaust fan 3, the first blower fan 17, and the second blower fan 19 are operated so that the air flow rate and the air flow rate are set based on the detection information of the air flow rate sensor S1 and the second air flow rate sensor S2. Let them do it. That is, the control unit 5
Using the air flow rate control means 100, the input amount detection means 101
Also, each of the cutoff control means 102 is configured.

[Other Embodiment] As a means for obtaining the input amount information of the grain to the drying section 1, as in the above-mentioned embodiment, the control section 5 is used.
In addition to using the information set and input in, there are also the following means. For example, a means for detecting the amount of grains stored in the drying section 1 (for example, a large number of sensors installed at appropriate intervals in the vertical direction of the storage space K) is provided in the drying section 1 and directly detected by the detection information. It is also conceivable to obtain the information regarding the grain storage amount obtained in (1) as the input amount information. Further, the specific configuration of each part can be variously changed, such as the blocking means 15 being constituted by a vertically sliding type blocking member. The present invention can be applied even if the structure of the drying unit 1 is not of the grain circulation type as described above but of the grain storage type. In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

[Figure 1] Vertical side view of grain dryer

[Explanation of symbols]

 1 Drying Section 2 Blower Means 3 Exhaust Means 15 Shutoff Means 100 Air Volume Control Means 101 Input Amount Detection Means 102 Shutoff Control Means S1 Air Amount Detection Means S2 Exhaust Air Volume Detection Means

Claims (3)

(57) [Claims] 1. A drying unit (1) for containing grains to be dried, a blowing unit (2) for blowing dehumidified air to the drying unit (1), and an exhaust air for the drying unit (1). A dehumidifying / drying machine provided with an air exhausting means (3) for controlling the exhaust air amount of the air exhausting means (3) to be a predetermined amount larger than that of the air blowing means (2). Dehumidifying dryer. 2. An exhaust air amount detecting means (S2) for detecting an exhaust air amount of the air exhausting means (3), an air blowing amount detecting means (S1) for detecting an air blowing amount of the air blowing means (2), and the exhaust air. Based on the detection information of the air flow rate detection means (S2) and the air flow rate detection means (S1), the air exhaust rate (3) or the air flow means (2) is set so that the exhaust air volume is higher than the air flow volume by a predetermined amount. 2. The dehumidifying dryer according to claim 1, further comprising an air volume control means (100) for automatically adjusting 3. A blocking means (15) for blocking the flow of dehumidified air to a part of the drying section (1), and the drying section (1).
Input amount detecting means (101) for detecting the input amount of grain to
And a shutoff control means (102) for operating the shutoff means (15) based on the information of the input amount detection means (101).
3. The dehumidifying dryer according to claim 2, further comprising: an air amount control means (100) configured to adjust the exhaust air amount and the air blowing amount to increase as the input amount increases.