JPH0442713Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to an air conditioning device for drying grains that fills a drying bin with grains and automatically generates and blows drying air suitable for the drying conditions of the grains to dry the grains. PRIOR ART This type of equipment is usually referred to as a flatbed dryer and is used as a storage bin, dry store, or container dryer. Generally, flat bed drying equipment is operated by controlling the temperature of air at room temperature or 5 to 10° C. warmer than room temperature. The drying temperature has a little to do with flat bed drying, but the relative humidity of the drying air has a lot more to do with it than the temperature. In other words, it is important for flat bed drying to have a good understanding of the grain's equilibrium moisture content and the corresponding relative humidity, and to adjust the drying air to the relative humidity as much as possible. In Japan, the regulation for the moisture content of rice grains is in the range of 14.5 to 15.5%, although it varies depending on the region. Table 1 shows the relative humidity corresponding to the equilibrium moisture content of paddy dried on a flat bed, as seen from previous experiments.

[Table] This (Table-1) shows that, for example, in order for grain to be dried to a final equilibrium moisture content of 14.5%, the relative humidity must be
By blowing about 60% dry air, the lower layer of grain will
This means that the moisture content does not drop below 14.5%, and the moisture content is uniform throughout the entire layer. In reality, during the grain harvesting period, the temperature difference between day and night and morning is about 7 degrees Celsius, and the humidity difference is 50% during the day.
It is about 85% from night to morning, so it goes up to about 35%. To operate a flat-bed dryer under such outside air conditions, the operator reads the dry-bulb temperature and wet-bulb temperature using a psychrometric thermometer, and then calculates the air temperature from an psychrometric chart, etc. based on those values. After determining the temperature, the temperature is set on the temperature setting device on the operation panel and the system is operated. However, it is very troublesome for workers to change the setting value of the temperature setting device according to the temperature of the outside air and temperature changes, so in reality, the temperature is kept at room temperature during the day and 5 to 10 degrees Celsius below the outside temperature at night. Rough operation is performed by heating the outside air. Therefore, in reality, the humidity of the blown dry air is currently far different from the relative humidity corresponding to the equilibrium moisture content adapted to the grain. (Problem to be solved by the invention) If the relative humidity of the drying air is high in response to the above-mentioned relative humidity changes, the drying of the grain will hardly proceed, resulting in deterioration of the grain, or damage to the lower layer. This causes the grain to absorb moisture and cause cracking.
Furthermore, if the humidity of the drying air is low, the grains in the lower layer will dry out and become overdried below the specified equilibrium moisture content (14.5 to 15.5%). On the other hand, the current situation is that the upper layer of the grain is not dried by the amount of energy used to dry the lower layer, which increases the uneven drying of the upper and lower layers of the grain, leading to a decline in quality. Further, in conventional flat bed drying equipment, there are cases where it is necessary to blow low-humidity air. The air that passes through the blower (when the hot air generator is not in operation) due to the heat energy generated by the blower's motor is heated by approximately 1.8 degrees Celsius and the humidity is reduced by approximately 5% compared to before passing through. For example, the outside temperature is 20℃ and the humidity is 50℃.
% air when it is blown as dry air has a temperature of 21.8℃ and a humidity of 45%, which deviates from the specified equilibrium moisture content, causing problems such as overdrying and uneven drying, and reducing energy consumption. It's also inefficient. Therefore, the present invention makes it possible to humidify the dry air sent to the air chamber at the bottom of the drying bin, and also detects the humidity at a point before the air is blown into the drying bin, so that the drying air can be kept dry under any outside air conditions. It is an object of the present invention to provide an air conditioning device for drying grains that can perform drying corresponding to the equilibrium moisture content and achieve high quality drying. (Means for Solving the Problem) In order to achieve this objective, the present invention includes a plurality of drying bins 1 for storing grains in a dry manner, and a ventilation duct 3 connected to an air chamber 10 at the bottom of the drying bins 1. a blower device 4 having a humidity sensor 16 disposed in the middle of the blower duct 3; a hot air fan 5 and a humidifier arranged close to and facing the suction port of the blower device 4; 6, and a control means 7 for controlling the hot air blower 5 and the humidifier 6 to adjust the air humidity based on the signal from the humidity sensor 16 in the blower duct 3. (Function) With this configuration, the humidity of the dry air is detected by the humidity sensor before being blown into the air chamber at the bottom of the drying bin, and the hot air fan and humidifier are controlled. Therefore, under any outside air conditions, the dried material can be dried with dry air to a relative humidity corresponding to its equilibrium moisture content. (Example) Hereinafter, the present invention will be described in detail based on drawings showing examples thereof. First, in FIGS. 1 and 2, the present device includes a plurality of integrated drying bins 1, each drying bin 1 is connected to an air duct 3 via an air duct 2, and the air duct 3 is connected to the air duct 3. It consists of an air blower 4, a hot air fan 5 and a humidifier 6 that are arranged adjacent to the air blower 4, and a control panel 7 that controls the hot air fan 5 and the humidifier 6. Each drying bottle 1 is
It consists of a grain storage section 8 and an air chamber 10 formed by an aeration floor 9. An air duct 2 passes through a plurality of adjacent air chambers 10 from the start end to the end end, and is sealed at the end end. Air shutters 11 are provided on both left and right sides of the air duct 2 in the longitudinal direction, and for each air chamber 10. This air shutter 11 can be opened and closed by remote control from the outside so that the blowing of drying air can be controlled depending on whether the grain 12 is to be dried or not. Storage compartment 8 and air chamber 10
The ventilation floor 9 located between the air chamber 10
In order to evenly send the dry air sent to the storage section 8, it has a mesh shape. This may be a small hole. A base end of the air duct 2 is connected to a blower duct 3. Further, the blower duct 3 is connected to a blower device 4. The blower device 4 includes a fan 13, a motor 14 that rotates the fan 13, and a suction duct 15 that sucks dry air. Close to the suction duct 15 and
A hot air fan 5 and a humidifier 6 are arranged in parallel approximately at the center of the front surface of the room. The hot air fan 5 is configured to use a fan to blow air from a heat source such as an electric heater or oil fuel heater, and the humidifier 6 is configured to generate water vapor and blow the air using a fan. The hot air blower 5 and the humidifier 6 may be an integrated device. In order to control these hot air fan 5 and humidifier 6, a humidity sensor 16 is provided as a detection device to be inserted into the air duct 3, and this humidity sensor 16 is electrically connected to a humidity converter 17. has been done. This humidity converter 17 and computing unit 18
, the humidity setting device 19 and the controller 20 make up the control panel 7.
The controller 20 is electrically connected to the hot air blower 5 and the humidifier 6 to enable control. However, the control panel 7 and its peripheral equipment shown in FIG. 1 are only schematically shown. In this embodiment, a hot air fan 5 and a humidifier 6 were used as sources of drying air, but instead of these,
A heater generator consisting of an evaporator, a condenser, an expansion valve for circulating refrigerant, and a compressor may be connected to the suction duct 15 and controlled by the control panel 7. Next, its effect will be explained. First, the motor 14 is driven, the fan 13 is rotated, and a predetermined humidity value is set in the humidity setting device 19 in order to blow predetermined dry air. When the fan 13 rotates, a humidity signal detected by the humidity sensor 16 is converted into a current by the humidity converter 17. This electrical signal is sent to the humidity setting device 19.
A predetermined humidity signal set to
Comparisons and calculations are made by This calculated signal is analyzed by the controller 20, and the hot air fan 5 and humidifier 6
will be driven. In this way, when dry air is blown, if the humidity in the air duct 3 is higher than the set value set in the humidity setting device 19, the humidifier 6 is stopped and the humidity signal from the humidity sensor 16 is output. and the set value of the humidity setting device 19 are compared and calculated by the calculator 18, and the signal is analyzed by the controller 20 to operate the hot air blower 5 to lower the humidity of the dry air. During this time, the humidity is regulated by controlling the output of the electric heater, which is the heat source used in the hot air blower 5, or by controlling the amount of oil such as petroleum fuel, or by starting and stopping the hot air blower 5. Ru. Furthermore, if the humidity of the dry air being blown is lower than the setting value set in the humidity setting device 19, the hot air blower 5 is stopped and the humidity signal from the humidity sensor 16 and the setting value of the humidity setting device 19 are The calculation unit 18 compares and calculates the signals, and the controller 20 analyzes the signals and operates the humidifier 6 to increase the humidity of the dry air. During this time, the humidity is adjusted by controlling the operation of a motor or an oscillator or the like, or by starting and stopping the humidifier 6 so that the amount of water vapor generated by the humidifier 6 changes. Depending on the gas phase of the outside air, both the hot air blower 5 and the humidifier 6 may be stopped and only the fan 13 may be operated. By detecting the humidity using the humidity sensor 16 and controlling the hot air blower 5 and the humidifier 6, the grain to be dried can be dried at a humidity corresponding to its equilibrium moisture content under any outside air condition. Dry with dry air. (Effects of the invention) Based on the above, a hot air fan and a humidifier are installed to generate dry air, and this humidity-controlled dry air is sent through the air chamber at the bottom of the drying bin to dry the dry matter in the drying bin. Because it is something that
Since drying can be carried out in accordance with the equilibrium moisture content of the grain to be dried under any outside air conditions, high-quality drying without excessive drying, uneven drying, cracking of grain shells, etc. can be achieved regardless of the annual weather conditions.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of the present device, and FIG. 2 is a longitudinal sectional view taken along line A-A in FIG. 1... Drying bin, 3... Air duct, 4... Air blower, 5... Hot air generator, 6... Humidifier, 7... Control means (control panel), 12... Grain, 15... Suction duct , 16...humidity sensor.

Claims (1)

[Claims for Utility Model Registration] (a) A plurality of drying pins 1 for drying and storing grain; (b) A blower duct 3 connected to an air chamber 10 at the bottom of the dryer pins, the blower duct 3 (c) a hot air fan 5 and a humidifier 6 disposed close to and facing the suction port of the blower device 4;
and (d) a control means 7 that controls the hot air fan 5 and the humidifier 6 to adjust the air humidity based on the signal from the humidity sensor 16 in the air duct 3. Air conditioning equipment for grain drying.