JPH03204585A - Control of hot air temperature in sample grain drying device - Google Patents

Abstract

PURPOSE:To control hot air temperature uniformly and highly accurately in all spaces in the title device by a method wherein the temperature of suction air, induced into a hot air generating chamber, is measured and the calorific value of a heat source is controlled by a difference between a preset drying hot air temperature and the suction air temperature to generate dried hot air having predetermined temperature. CONSTITUTION:A suction fan 6, sucking hot air from a hot air generating chamber 3 and ventilating the hot air into a sample container 1, is provided in a hot air chamber 2 and when the suction fan 6 is driven, air is sucked from an air suction port 5 and hot air, heated by an electric heater 4 in the hot air generating chamber 3, is ventilated from the hot air chamber 2 into the sample container 1. A temperature sensor 9 measures the temperature of air sucked into the hot air generating chamber 3. The number of energized electric heaters 4 is controlled so as to be increased or decreased so that the hot air temperature becomes a predetermined temperature based on a difference between the suction air temperature, measured by the temperature sensor 9, and the preset hot air temperature. The change of temperature can be controlled smoothly and properly while the temperature of dried hot air, ventilated into respective sample containers 1, can be controlled simply with a high accuracy.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a sample grain drying apparatus used in grain communal drying facilities, etc., in which multiple sections or types of sample grains are individually ventilated and dried. This is a method for controlling temperature.

[Prior art] Conventionally, in a communal grain drying facility, a portion of grain brought in by individuals or consignees is extracted as a sample and dried under the same conditions to obtain multiple categories or types of sample grain. For example, a sample grain drying device for
Various methods are already known, as described in Japanese Patent No. 467 and the like.

[Problems to be Solved by the Invention] By the way, the conventional sample grain drying apparatus of this type blows dry hot air through the grains housed in a large number of sample containers to dry each grain. Since it is necessary to maintain the hot air flowing through the grains stored in the sample containers under the same conditions, a temperature sensor is placed in each hot air supply chamber of each sample container to measure the hot air temperature, and each temperature is controlled separately. Therefore, there are problems in that the control means is complicated and large-scale, and its maintenance, inspection, etc. are extremely complicated.

In view of the above-mentioned problems with the conventional methods, the present invention has been developed to control the temperature of hot air blowing through a large number of sample containers evenly and with high precision by simply measuring the temperature of the air sucked into the hot air generation chamber. The purpose of the present invention is to provide a method for controlling the temperature of hot air in a sample grain drying apparatus.

[Means for Solving the Problem] The present invention proposes the following method as a technical means for achieving the object.

That is, it is a sample grain drying device that air-dries multiple sections or types of sample grains separately, and a heat source such as an electric heater is installed in a hot air generation chamber that blows dry hot air through a large number of sample containers. In this method, the temperature of the intake air drawn into the hot air generation chamber is measured, and the calorific value of the heat source is controlled based on the difference between the preset dry hot air temperature and the above intake air temperature to generate dry hot air at a predetermined temperature. This is a hot air temperature control method in a sample grain drying apparatus characterized by the following.

[Function] According to the hot air temperature control method in the sample grain drying apparatus according to the present invention, the calorific value of the heat source is controlled by the difference between the temperature of the air sucked into the hot air generation chamber and the preset hot air temperature. By measuring the temperature of the intake air at only one location, it is possible to precisely control the increase or decrease in the calorific value of the heat source, and the temperature of the dry hot air ventilated into each sample container can be easily and highly accurately controlled.

In particular, when the heat source is an electric heater, temperature control based on the difference between the intake air temperature and the set hot air temperature can be performed more simply and with extremely fast response.

[Example ] An embodiment of the present invention will be described with reference to the drawings.

The drawing shows an example of an apparatus for carrying out the control method according to the present invention, in which 1 is a sample container, 2 is a hot air chamber, and 3 is a hot air generation chamber. This is a breathable surface made of The hot air generation chamber 3 is communicated with the hot air chamber 2, and a plurality of electric heaters 4 are installed inside the hot air generation chamber 3.
is provided. 5 is an air intake port. In the hot air chamber 2, hot air is sucked from the hot air generation chamber 3 and a sample container l is placed inside the hot air chamber 2.
A suction fan 6 is provided for blowing hot air through the chamber. When the suction fan 6 is driven, air is sucked through the air intake port 5, and the hot air heated by the electric heater 4 in the hot air chamber 3 is transferred from the hot air chamber 2 to the sample. The container 1 is designed to be ventilated. The solid arrows in the figure indicate the air flow. The hot air generation chamber 3 is provided with an air discharge lower, and an exhaust fan 8 is provided there. Broken arrows in the figure indicate air flow in the case of air discharge.

9 is a temperature sensor, and this temperature sensor 9 measures the temperature of the intake air into the hot air generation chamber 3;
The device is equipped with a control means for increasing or decreasing the number of energized electric heaters 4 so that the hot air temperature reaches a predetermined temperature based on the difference between the intake air temperature measured by the temperature sensor 9 and a preset hot air temperature. (not shown), the amount of heat generated by the electric heater 4 may be controlled by means of continuously increasing or decreasing the amount of power supplied by an inverter or other power control means.

The apparatus may be configured such that a large number of sample containers 1 are stacked, each of which is sequentially moved onto the hot air generation chamber 2, and each grain contained therein is sequentially ventilated and dried.

In the apparatus configured as described above, the hot air generation chamber 3
The amount of heat generated by the electric heater 4 is controlled to increase or decrease depending on the difference between the temperature of the air taken in and the preset hot air temperature.
The temperature sensor 9 that measures the temperature of the intake air only needs to be installed at one location, and by measuring the temperature at that one location, the amount of heat generated by the electric heater 4 can be increased or decreased without intermittent (ON, 0FF) control, and the temperature can be controlled. Changes can be controlled smoothly and precisely. Therefore, the temperature of the dry hot air blown to each sample container can be easily and highly accurately controlled.

[Effects of the Invention] The hot air temperature control method in a sample grain drying device according to the present invention is a sample grain drying device that air-dries multiple sections or types of sample grains separately, and in which drying hot air is applied to a large number of sample containers. In a device in which a heat source such as an electric heater is provided in a hot air generation chamber for hot air, the temperature of the intake air drawn into the hot air generation chamber is measured, and the difference between the preset dry hot air temperature and the above intake air temperature is determined. Since it generates dry hot air at a predetermined temperature by controlling the calorific value of the heat source, it is possible to measure the temperature of the hot air flowing through a large number of sample containers by simply measuring the temperature of the air sucked into the hot air generation chamber. The effect of uniform and highly accurate control can be obtained.

[Brief explanation of drawings]

The drawings show an example of an apparatus for carrying out the hot air temperature control method in a sample grain drying apparatus according to the present invention, with FIG. 1 being a perspective view and FIG. 2 being a vertical front view. l...Sample container, 2...Hot air chamber, 3...Hot air generation chamber, 4...Plural electric heaters, 5...Air intake port,
6... Suction fan, 7... Air discharge port, 8 Exhaust fan, 9... Temperature sensor

Claims (1)

[Claims] A sample grain drying device that air-dries multiple sections or types of sample grains separately, and is equipped with a heat source such as an electric heater in a hot air generation chamber that blows dry hot air through a large number of sample containers. The temperature of the intake air taken into the generation chamber is measured, and the calorific value of the heat source is controlled based on the difference between a preset dry hot air temperature and the above intake air temperature to generate dry hot air at a predetermined temperature. Method for controlling hot air temperature in sample grain drying equipment.