JPS5914710Y2 - Grain ventilation drying equipment - Google Patents

Description

[Detailed description of the invention] The present invention consists of a grain tank that is formed to allow drying air to pass through all or part of the loaded grains, and that stores the grains to be dried; The present invention relates to an improvement in a grain ventilation drying device which is combined with a burner device for generating hot air to be used as drying air to be sent to grains placed in a tank.

Drying of grain using the above-mentioned grain ventilation dryer is usually done by adjusting and controlling the operating state of the burner device that generates the hot air that is sent to the grains placed in the grain vat. This method generates hot air at a nearly constant temperature, and continues to supply the hot air for a certain period of time. If the grain is not only plentiful but also wet, not only will it take longer to finish drying, but the temperature of the hot air may be kept too low at the beginning of the drying process when the grain temperature hardly rises. A problem has arisen.

This can be done by adjusting the operating state of the burner device to a state where it can burn a large amount of fuel during the initial drying process, but normal burner devices are not equipped with this. The range in which proper combustion is achieved is set to a certain width depending on the amount of combustion air produced by the burner blower and the amount of fuel sent from the fuel pump, so increasing the amount of fuel supplied will result in decreased performance and failure. This will lead to complete combustion.

Furthermore, even if a burner device that can adjust the combustion state over a wide range is used, it is difficult to switch from burning a large amount of fuel at the beginning of the drying process to burning a normal amount of fuel as the grain temperature rises. There is a problem that it is difficult to perform this automatically.

Therefore, in the present invention, an electromagnetic electromagnetic device that supplies fuel to a burner device that is combined with a grain tank that supplies the grains that are to be dried, and which supplies hot air to the grains that are loaded in the grain tank. A burner device is used in which the pump is driven by a frequency proportional to the rotation speed of a blower motor that supplies combustion air, and the circuit of the blower motor of the burner device has a desired upper limit of the rotation speed of the motor. A control circuit equipped with a manual variable resistance that can be set is connected, a temperature sensor circuit whose electrical resistance value decreases as the temperature rises is connected in parallel to the control circuit, and the temperature sensor is stretched in the grain tank. The present invention proposes a means for configuring a grain ventilation dryer by arranging it at an appropriate position in the aforementioned grain tank so as to detect the temperature of the loaded grain.

Next, an example of implementation will be explained in detail according to the drawings.
In the figure, 1 is the body of the grain ventilation dryer A, 2 is the grain tank installed in the inner cavity of the grain tank 1, and 3 is the drying air ( 4 is a burner device that generates the hot air; 5 is a burner device that generates the hot air; A burner blower 6 sends the hot air generated by the burner device 4 to the air guide path 3 and also feeds combustion air to the burner device 4; The heated air is passed through the grain tank by a suction fan, as shown by the arrow in Fig.
A suction port communicates with a cavity 7 formed below the bottom plate 2a.

The burner device 4 is equipped with a pump P for supplying fuel and the aforementioned blower 5 operated by a motor M to supply combustion air, but the pump P for supplying fuel is An electromagnetic pump is used in which an intermittent current is applied to an electromagnet or a solenoid to operate a plunger and perform a pumping action.
As shown in the block diagram of the figure, the blower 5
The output from the pilot generator, which generates a sinusoidal output wave output proportional to the rotation speed of the motor M, is sent to the switch circuit F via the Schmitt trigger circuit E, and the switch circuit F is turned on according to the frequency.・By turning it off,
The pump operates according to the frequency mentioned above, and as a result,
A blower 5 driven by a motor M is a burner device 4
The amount of fuel supplied to the burner device 4 is controlled to be increased or decreased in accordance with the increase or decrease in the amount of combustion air supplied to the burner device 4.

The above-mentioned motor M has a rotational speed of the grain tank 2.
It is controlled by a temperature sensor S provided to detect the temperature of the grains stuffed inside.

Further, specifically according to the circuit diagram shown in FIG. The output signal is Schmitt trigger circuit E
It is shaped into a square wave by the circuit E, and the gate 2
0 to the thyrisk switch 21 provided in the switch circuit F that operates the electromagnetic pump P,
It turns on and off at the same frequency as the square wave sent out from the pilot generator mentioned above, so that the amount of fuel supplied to the burner device 4 increases or decreases in accordance with the height of the frequency proportional to the rotation speed of the blower motor M. As a result, the amount of fuel supplied to the burner device 4 is proportionally increased or decreased in accordance with the increase or decrease in the amount of combustion air supplied by the blower 5.

The motor M of the blower 5 described above is controlled by a manual variable resistor R provided in a control circuit G connected to a circuit m of the motor M so that the upper limit of the rotation speed is set to a desired value.

Further, the control circuit G is connected in parallel with a sensor circuit S including the above-mentioned temperature sensor S, such as an IC sensor or a thermistor, which is configured so that the electrical resistance decreases as the temperature rises. M is this sensor circuit S
While the temperature detected by the temperature sensor S is low and the voltage on the control circuit G side is lower than that on the sensor circuit S side, the manual variable resistor R provided in the control circuit G sets the temperature as desired. The rotation speed is controlled so that the temperature difference between the sensor circuit S side and the control circuit G side becomes the same due to a decrease in resistance due to the temperature rise of the temperature sensor S, so that the rotation speed is decreased.

As shown in FIG. 1, the temperature sensor S of the sensor circuit S mentioned above is arranged at an appropriate part of the machine body 1 so as to detect the temperature of the grain stuffed into the grain tank 2. has been done.

In the above circuit diagram (Fig. 4), 22 is a normal AC power supply, 23 is a rectifier, and 24 is a thyrisk switch 2.
1 is a capacitor that is connected so that when a signal is sent from the Riga circuit E, a current flows through the electromagnetic pump P by the amount that is being charged, and 8 is an elevator, 9
1 is an equalizer, 10 is a drum shutter, and 11 is a discharge conveyor.

For example, when drying raw rice having a moisture content of about 25 to 26%, the grain ventilation dryer A configured in this manner controls the operation of the motor M of the blower 5 using the manual variable resistance R. The temperature of the hot air generated by the burner device 4 and sent out by the combustion air supplied by the burner device 5 and the fuel supplied by the electromagnetic pump P is a temperature that is safe from fire, etc. 80
Temperature sensor S
By detecting that the grain temperature has reached 40°C, if drying is performed with the voltage of the sensor circuit S set to be the same as the voltage of the control circuit G, the temperature sensor S will reach 40°C.
℃ (sometimes set to about 30℃), the operation of the motor M of the blower 5 is controlled by a manual variable resistor R provided in the control circuit G, and the operation of the electromagnetic pump P is controlled. Since the burner device 4 is controlled by the rotational speed of the motor M of the blower 5, the temperature of the hot air generated by the burner device 4 reaches an upper limit of 80° C., which is the upper limit temperature set by the manual variable resistor R. The operation will continue in this state, and when the grain temperature gradually rises and reaches the grain temperature set in the temperature sensor S, the blower 5
The rotation of the motor M decreases, and as a result, the amount of fuel supplied decreases, the amount of combustion by the burner device 4 decreases, and the temperature of the hot air sent out decreases. The blower 5 rotates faster and the operating state of the burner device 4 becomes more active, and as the grain temperature increases, the rotation of the blower 75 decreases and the operating state of the burner device 4 becomes lower. This makes it possible to supply hot air with the amount of heat required for drying while suppressing the grain temperature from rising above a set temperature.

Therefore, according to the present invention, at the beginning of the drying process, until the temperature of the grains loaded in the grain tank reaches the upper limit temperature within the range that does not cause deterioration, the burner device blows hot air. It operates at the maximum capacity set to keep the temperature at a safe temperature, and when the grain temperature reaches the set temperature, the operation of the burner device is reduced and from then on, hot air with the amount of heat necessary for drying is sent out. This makes the drying work more efficient, and also makes management and control of the grain ventilation dryer easier during the drying process.

In addition, in the embodiment, the grain ventilation dryer according to the present invention is a grain ventilation dryer that circulates and dries the grains, but it is also possible to dry the grains while they remain in the grain tank. The dryer may be any type of dryer, and its model does not matter.Also, the burner device used is a pot-type burner device in the illustrated embodiment, but a gun-type burner may be used. Of course.

[Brief explanation of drawings]

FIG. 1 is a vertical side view of a grain ventilation dryer embodying the present invention, FIG. 2 is a vertical front view of the same, FIG. 3 is a block diagram of the same, and FIG. 4 is an electric circuit diagram of the same. Explanation of drawing symbols A... Grain ventilation dryer, 1.
... Aircraft, 2 ... Grain tank, 3 ...
Air guide path, 4... Burner device, 5...
Blower, M...Blower motor, P...
...Electromagnetic pump, D... Generator, E...
・Schmitt trigger circuit, F... switch circuit, G... control circuit, R... variable resistor,
S...Temperature sensor, S...Sensor circuit.

Claims (1)

[Scope of utility model registration request] An electromagnetic pump that supplies fuel to a burner device that supplies hot air to a grain tank that is filled with grains that are to be dried, sends combustion air to the grain tank. A burner device that is driven by a frequency proportional to the rotation speed of the blower motor to be supplied is used, and the circuit of the blower motor of the burner device has a manual variable speed that can set the upper limit of the rotation speed of the motor as desired. A control circuit equipped with a resistor is connected to the control circuit, and a temperature sensor circuit whose electrical resistance value decreases as the temperature rises is connected in parallel to the control circuit. A grain ventilation drying device characterized in that the grain ventilation drying device is arranged at an appropriate position in the grain tank described above so as to detect temperature.