JPH04235747A - Dehumidifying dryer - Google Patents

Abstract

PURPOSE:To certainly prevent the generation of dust to the outside, to minimize the penetration of the open air into a drying part through the gap of a casing and to enhance drying efficiently by making the air discharge amount of an exhaust means larger than the air feed amount of a blower means by a specified amount. CONSTITUTION:The data of the charging amount of grain to a drying part is set and inputted to a second control part 5B and also transmitted to a first control part 5A. A plurality of cut-off valves 15 are subjected to opening and closing operation on the basis of said charging amount and an air feed amount and an air discharge amount are set so as to become much as the charging amount of grain increases. An exhaust fan 3, a first blow fan 17 and a second blow fan 19 are operated on the basis of the detection data of first and second air amount sensors S1, S2 so that the air feed amount and the air discharge amount become set values. By this method, a part where the pressure in the drying part is higher than atmospheric pressure is eliminated.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention comprises a drying section for storing grains to be dried, a blowing means for blowing dehumidified air into the drying section, and an exhaust means for discharging the air from the drying section. The present invention relates to a dehumidifying dryer equipped with a dehumidifying dryer.

0002

2. Description of the Related Art Conventionally, no consideration has been given to whether the relationship between the amount of air blown by the air blowing means and the amount of air discharged by the air exhaust means is appropriate.

0003

[Problems to be Solved by the Invention] When the amount of air blown is larger than the amount of discharged air, the air pressure in the drying section becomes high, so that the air in the drying section leaks from the gap in the casing. As a result, there is a risk that a large amount of dust will be released outside the drying section, and it is desirable to reliably avoid such dust release. On the other hand, if the amount of air blown is much smaller than the amount of discharged air, the air pressure inside the drying section will be low, and a large amount of external air will enter the drying section through the gap in the casing. As a result, there was a possibility that the humidity in the drying section would increase and the drying efficiency would decrease. An object of the present invention is to provide a dehumidifying dryer that reliably avoids the release of dust and has high drying efficiency.

0004

[Means for Solving the Problems] In order to achieve this object, the first characteristic configuration of the dehumidifying dryer according to the present invention is that the amount of air discharged by the air exhaust means is larger than the amount of air blown by the air blowing means by a predetermined amount. It is structured as follows. A second characteristic configuration includes: an exhaust air amount detection means for detecting the amount of air discharged from the air exhaust means; an air amount detection means for detecting the amount of air blown from the air blowing means;
Air volume control means automatically adjusts the air exhaust means or the air blowing means so that the exhaust air volume is greater than the air volume by a predetermined amount based on information detected by the air exhaust volume detection means and the air volume detection means. That's what I prepared for. A third characteristic configuration includes a blocking means for blocking the flow of dehumidified air to a part of the drying section, an input amount detection means for detecting the amount of grain input into the drying section, and an input amount detection means for detecting the amount of grain input into the drying section. and a cutoff control means for operating the cutoff means based on information, and the air volume control means is configured to adjust the exhaust air volume and the air blowing volume to become larger as the input amount increases. be.

[0005]

[Operation] Since the flow of air within the drying section is not uniform, the pressure distribution within the drying section is also not uniform. Therefore, even if the amount of air discharged by the air exhaust means and the amount of air blown by the air blowing means are made the same, the disadvantage of dust emission cannot be reliably avoided. Therefore, the first
In the characteristic configuration, in order to eliminate a portion where the pressure inside the drying section is higher than the outside pressure, the amount of air discharged by the air exhaust means is set to be larger than the amount of air blown by the air blowing means by a predetermined amount, thereby reliably avoiding the release of dust. Of course, the predetermined amount is sufficient as long as it eliminates a portion where the pressure inside the drying section is higher than the outside pressure, and thereby, it is possible to prevent a large amount of outside air from entering the drying section as much as possible. With the second feature, it is possible to suppress errors in the predetermined amount even when the input amount of grain changes and the ventilation resistance changes. In the third characteristic configuration, it is possible to suppress the flow of dehumidified air from concentrating in a space where there is no grain, and to adjust the amount of flow of dehumidified air to an appropriate amount according to the amount of grain input.

[0006]

[Effects of the Invention] The first characteristic configuration accurately prevents the generation of dust, and minimizes the entry of outside air into the drying section through the gaps in the casing, resulting in dehumidifying drying with high drying efficiency. You can get a chance. In the second feature configuration,
Even when the amount of grain input changes and the ventilation resistance changes, dust generation and a decrease in drying efficiency can be suppressed. In the third feature, the flow rate of dehumidified air can be adjusted to an appropriate amount depending on the input amount of grain, so that appropriate drying can be performed.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. As shown in FIG. 1, the grain dryer includes a drying section 1 that stores grains to be dried, a dehumidifier 2 that serves as a blowing means for blowing dehumidified air into the drying section 1, and a dehumidifying device 2 that blows dehumidified air into the drying section 1. It is equipped with an exhaust fan 3 as an exhaust means for sucking and discharging air, a circulation device 4 for circulating and moving the grains in the drying section 1, and a control section 5 for controlling each section. The drying section 1 and the dehumidifying device 2 are connected via a ventilation duct 6,
The duct 6 has a drag-type first
An airflow sensor S1, a blowing thermometer 37 that measures the temperature of the air flowing through the duct 6, and a heater 38 that heats the flowing air as necessary are provided. Also, drying section 1
and the exhaust fan 3 are connected through an air exhaust duct 8, and the duct 8 is provided with a drag-type second air volume sensor S2 as an exhaust air volume detection means.

A storage space K for storing grains for drying is formed inside the drying section 1.
A plurality of ventilation passages 7 communicating with the ventilation duct 6 and the ventilation duct 8 are formed. Note that each ventilation passage 7 is configured by arranging a frame having a chevron-shaped cross-sectional shape with an open bottom. The storage space K is provided with an equalizer 10 that evenly distributes and supplies the grains from above, and a rotary valve 12 that discharges the grains little by little from the gap between the inclined plates 11. In other words, 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, dehumidified air from the dehumidifier 2 is supplied to the ventilation passage 7 via the air supply frame 13 and exhausted from the ventilation passage 7 to the outside via the exhaust frame 14. The air supply frame 13 is provided with a plurality of cutoff valves 15 as cutoff means for selectively blocking the flow of dehumidified air to a part of the drying section 1 . When the amount of grain input into the drying section 1 is large and the ventilation passage 7 is full of grains, all the plurality of shutoff valves 15 are opened, and when the amount of grain input into the drying section 1 is small, the ventilation passage 7 is opened. When there is almost no grain in the drying section 1, all the shutoff valves 15 are closed, and when the amount of grain input into the drying section 1 is between the above two cases, the upper shutoff valves 15 are closed according to the amount of grain input. Close the object and open the lower object. In the figure, 30 is a dust removal device, 31 is a fullness meter that detects whether the storage space K is full of grains, 32 is a grain thermometer that detects the temperature of grains, and 33 is a grain thermometer that detects grain temperature.
is a single grain moisture meter for measuring the moisture content of grains in the drying section 1.

The inside of the dehumidifying device 2 is divided into upper and lower parts, and the upper part 2A has a condenser 16 and a first blower fan 17.
In addition, an evaporator 18, a second blower fan 19, and a compressor 20 are provided in the lower part 2B, respectively, to form a heat pump circuit. The capacitor 16 functions to heat the outside air, and the evaporator 18 functions to dehumidify the outside air. A damper 20A, 21 is provided at each of the vent 20 that communicates the upper part 2A and the lower part 2B and the exhaust port 21 of the lower part 2B to adjust the amount of dehumidified air flowing from the lower part 2B to the upper part 2A through the vent 20.
A is provided. Furthermore, these dampers 20A and 21A
are configured to be opened and closed in a contradictory manner. That is, when one damper 21A is fully closed, the other damper 20
A is fully opened, and all the dehumidified air cooled and dehumidified by the evaporator 18 is added to the upper part 2A via the vent 20. Furthermore, when the damper 21A is fully open, the damper 20A is fully closed, so that all the air cooled and dehumidified by the evaporator 18 is released to the outside, and only the air heated by the condenser 16 is sent into the duct 6. Become. In the figure, 34 is a temperature sensor that detects the dry bulb temperature of the outside air, and 35 is a humidity sensor that detects the humidity of the outside air. Although not described in detail, these sensors 34 and 35
The opening degrees of the dampers 20A and 21A are determined based on this information.

The circulation device 4 includes a lower screw conveyor 25 that conveys the grains discharged from the storage space K at appropriate time intervals by the intermittent driving of the rotary valve 12, and a lower screw conveyor 25 that transports the grains conveyed by the lower screw conveyor 25. It includes an elevator 26 and an upper screw conveyor 27 that conveys the grain lifted by the elevator 26 to the equalizer 10.

The control section 5 includes a first control section 5A located below the drying section 1 and a second control section 5B located above the dehumidifying device 2. As shown in FIG. 1, information on each sensor, etc. is input to the first control section 5A and the second control section 5B. And the first
The control unit 5A is configured to control the exhaust fan 3, rotary valve 12, and the like. Further, the second control unit 5B
Shutoff valve 15, first blower fan 17, second blower fan 19
and dampers 20A, 21A, etc. Incidentally, information on the amount of grain input into the drying section 1 (such as the weight of grain input into the drying section 1) is also set and input into the second control section 5B. This input amount information is also transmitted to the first control unit 5A via the signal line. To explain the adjustment of the amount of air blown and the amount of exhausted air, the plurality of shutoff valves 15 are opened and closed based on the input amount information, and the amount of air blown and the amount of exhausted air are set to increase as the amount of input increases. Also, at this time, the exhaust air volume is a predetermined amount (here,
5% of the air flow rate). And the first
The exhaust fan 3, the first ventilation fan 17, and the second ventilation fan 19 are operated so that the airflow and exhaustion amount become the set airflow and exhaustion amount based on the detection information of the airflow sensor S1 and the second airflow sensor S2. Let it happen. In other words, the control unit 5
The air volume control means 100 and the input amount detection means 101
and a cutoff control means 102, respectively.

[Another Embodiment] As a means for obtaining information on the amount of grain input into the drying section 1, as in the above embodiment, the control section 5
In addition to using the information set and input in , there are also the following methods. For example, the drying section 1 may be provided with means for detecting the amount of grain stored in the drying section 1 (for example, a number of sensors installed at appropriate intervals in the vertical direction of the storage space K), and the detected information can be used to directly It is also conceivable that the information regarding the grain storage amount obtained in the above-mentioned process is obtained as the input amount information. Further, the specific configuration of each part can be changed in various ways, such as by configuring the blocking means 15 with a shielding member that slides up and down. Furthermore, the present invention is applicable even if the structure of the drying section 1 is not of the grain circulation type as described above but of the grain storage type. Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

[Figure 1] Longitudinal side view of grain dryer

[Explanation of symbols]

1 Drying section 2. Air blowing means 3. Ventilation means 15　　　　　Shutoff means 100 Air volume control means 101 Input amount detection means 102 Cutoff control means S1 Air flow detection means S2 Exhaust air volume detection means

Claims (3)

[Claims] 1. A drying section (1) for storing grains to be dried, a blowing means (2) for blowing dehumidified air into the drying section (1), and a means for discharging the air from the drying section (1). The dehumidifying dryer is equipped with an air exhaust means (3), and is configured such that the amount of air discharged by the air exhaust means (3) is larger than the amount of air blown by the air blowing means (2) by a predetermined amount. Dehumidifying dryer. 2. Exhaust air amount detection means (S2) for detecting the amount of air discharged from the air exhaust means (3); air amount detection means (S1) for detecting the amount of air blown from the air blowing means (2); The air exhausting means (3) or the air blowing means (
2) The dehumidifying dryer according to claim 1, further comprising an air volume control means (100) for automatically adjusting the air flow rate. 3. A blocking means (15) for blocking the flow of dehumidified air to a part of the drying section (1);
input amount detection means (101) for detecting the amount of grain input into )
), and a cutoff control means (102) that operates the cutoff means (15) based on information from the input amount detection means (101).
), and the air volume control means (100) is configured to adjust the exhaust air volume and the air flow volume to increase as the input volume increases.