JPS62206376A - Method of controlling quantity of blast in cereal drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the amount of air blown in a grain dryer, and particularly to a method for controlling the amount of air blown in a hot air dryer that dries grain with hot air.

[Conventional technology]

Conventionally, hot air generated by a hot air generator is passed from a hot air chamber whose walls are made of wire mesh to an exhaust chamber whose walls are made of wire mesh, and the grain is retained between the hot air chamber and the exhaust chamber. A hot air dryer is known that dries hot air and discharges hot air to the outside using a blower.

According to this hot air dryer, a predetermined amount of grain loaded in the hot air dryer is retained between a hot air chamber and an exhaust chamber, and hot air is passed through this retained grain layer to dry the grain. By circulating the grains, the whole grain is dried. Here, the temperature of the hot air of the hot air dryer is determined according to the LDI of the grain, the outside temperature, and the amount of grain loaded, and generally, the amount of fuel supplied increases as the amount of grain loaded increases. It is imagined that it will become higher. Furthermore, the amount of air blown by the blower is set at a constant value, including the maximum amount of grain to be loaded, in order to prevent the grain temperature from rising more than necessary.

[Problem that the invention seeks to solve]

However, in conventional hot air dryers, even if the amount of grain loaded is small, the amount of air blown is controlled to be the same as the maximum amount loaded, increasing the ratio of the amount of air blown to the amount loaded, but the drying speed is Since the drying speed does not increase in proportion to the air volume, there is a problem in that the drying speed does not increase even though the proportion of the air flow is large, resulting in a large amount of energy loss. In addition, since more air is blown than necessary, there is a problem in that the drying speed of only the surface portion of the grain increases, and the frequency of drying on the shell side of the grain increases.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for controlling the amount of air blown in a grain dryer, which does not cause grain to sag and can save energy.

[Means for solving problems]

In order to achieve the above object, the present invention allows the hot air generated by the hot air generator to pass from the hot air chamber to the exhaust chamber, and then is blown by the blower and discharged to the outside, thereby creating a connection between the hot air chamber and the exhaust chamber. In controlling the amount of air blown by the grain dryer that dries the grains retained in the dryer, the amount of air blown is reduced as the amount of grain loaded decreases.

[Function] According to the present invention, the amount of air blown is controlled to be reduced as the amount of grain charged is reduced. The amount of air blown can be controlled by controlling the opening degree of a damper provided in the air duct or by controlling the rotation speed of the electric motor of the air blower. As a result, air is blown in accordance with the amount of filling, and the occurrence of sideward curling of the grain, etc. is prevented. Furthermore, when controlling the amount of air blown by controlling the number of revolutions of the electric motor, the number of revolutions is reduced as the amount of filling is reduced, so energy can be saved. Further, when the air flow rate is reduced, the air flow rate of the hot air generation device must be reduced accordingly, so that energy on the hot air generation device side can be saved.

〔Effect of the invention〕

As explained above, according to the present invention, the amount of air blown is reduced as the amount of turf is reduced, so that optimal air blown is performed according to the amount of tassel, and the generation of grain on the shell side can be prevented. This has the effect that it is possible to achieve energy savings as well as to achieve energy savings.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a schematic cross-sectional view of a hot air dryer equipped with a blower and splitter device to which the present invention is applicable.

Inside the hot air dryer main body 10, a hot air chamber 14 configured with a ventilation wall surface 12 such as a wire mesh is arranged.

On both sides of the hot air chamber 14, a ventilation chamber 18 having a ventilation wall 16 facing the ventilation wall 12 is arranged.The chamber 11 between the ventilation wall 12 and the ventilation wall 14 temporarily stores grains. It dries the grain by staying there and acts as a drying section.

At one end of the hot air dryer main body 10, a hot air generating device 20 consisting of a burner etc. is arranged so as to introduce hot air into the hot air chamber 14, and at the other end of the hot air dryer main body 10, an exhaust A blower 22 configured with an axial fan is arranged to discharge the hot air that has passed through the air chamber 18 to the outside. Blower 2
2 includes an electric motor 22A, an impeller 22B fixed to the output shaft of the electric motor 22A, and a guide vane 1122C,
A damper 24 is arranged on the suction side of the blower 22 to change the opening area of the suction port. This damper 24 is configured so that its opening area can be changed by being rotated by a step motor 26.

The step motor 2G is connected to an output port 30 that constitutes a control circuit. The control circuit is output port 3
0, central processing unit (CPU) 32, random access memory (RAM) 34, read-only memory (RO)
M) 3G, a human-powered boat 38, and buses such as a data bus and a control bus that connect these. A filling amount setting device 40 for setting the filling amount is connected to the input port 38. The output port 30 is
Furthermore, it is connected to a fuel pump 42. fuel pump 42
is connected to the fuel tank 44 via piping, and is also connected to the hot air generator 20 via a fuel transport pipe.

The above-mentioned ROM 36 stores in advance a control routine program to be described below, a map of the amount of air blown against the amount of injection shown in FIG. 3, and a map of the amount of fuel against the delivered mff1 shown in FIG. 4. The amount of air blown is determined to decrease as the amount of blown air decreases, and the amount of fuel is determined to decrease as the amount of air blown decreases, but to be precise, it is determined through experiments depending on the type of grain, etc. Note that although these maps are determined to change continuously, they may also be determined to change stepwise.

Next, the operation of this embodiment will be explained while explaining the control routine shown in FIG. When the grain is loaded into the hot air dryer main body 10, the loading amount is set by the driver using the loading amount setting device 40.

In step 100, the filling amount set by the filling amount setting device 40 is read, and in step 102, the air blowing amount and fuel amount corresponding to the setting filling amount are determined from the maps shown in FIGS. 3 and 4. In step 104, which is the zero-order calculation, the step motor is controlled and the damper opening degree is controlled so that the airflow rate of the blower 22 is equal to the airflow rate calculated in step 102, and in step 106, The fuel pump 42 is configured so that the amount of fuel calculated in step 102 is supplied to the hot air generator)'i20.
is controlled, whereby the fuel is combusted in the hot air generator to generate hot air. Here, normal air-fuel ratio control is performed to improve the combustion efficiency of the hot air generator, and the residual oxygen concentration in the hot air is detected by an O2 sensor (not shown), and the air-fuel ratio is adjusted by controlling the amount of air supply. Controlled to maintain the stoichiometric air-fuel ratio. Therefore, the amount of hot air generated by the hot air generator decreases as the amount of fuel supplied decreases, as shown in FIG.

The hot air generated by the hot air generating device is discharged from the hot air chamber to the outside through the drying section and the exhaust chamber by the blower, and when the hot air passes through the drying section, the grains are dried.

In addition, although the example in which the air volume is controlled by controlling the damper opening using an axial fan is described above, the air volume may be controlled by controlling the rotation speed using a sirocco fan. .

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a hot air dryer equipped with an air blow rate control device to which the present invention can be applied, Fig. 2 is a flowchart of a control routine according to an embodiment of the present invention, and Fig. 3 is a diagram showing air blow rate and FIG. 4 is a diagram showing the relationship between the amount of hot air and the amount of fuel supplied. FIG. 5 is a diagram showing the relationship between the amount of hot air and the amount of fuel supplied. 14...Hot air chamber, 18...Exhaust air chamber, 20...Hot air generator, 22...Blower.

Claims (1)

[Claims] (1) The hot air generated by the hot air generator is passed from the hot air chamber to the exhaust chamber, and then blown by the blower and discharged to the outside to dry the grains accumulated between the hot air chamber and the exhaust chamber. 1. A method for controlling the amount of air blown in a grain dryer, characterized in that the amount of air blown is reduced as the amount of grain loaded decreases.