JPS5914711Y2 - 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 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.

More specifically, in the grain ventilation drying device,
The burner device includes a burner device in which an electromagnetic pump that supplies fuel is driven at a frequency proportional to the rotational speed of a motor of a blower that feeds combustion air, and the operation of the motor is controlled by The upper limit is regulated by a control circuit comprising a manually variable resistor connected to the circuit of
The grains are controlled to continue operating at the upper limit until the temperature of the grains in the grain tank reaches a predetermined temperature by a temperature sensor of a sensor circuit provided in parallel with the control circuit. This paper relates to improvements to ventilation dryers.

The purpose of the present invention is to reduce the temperature of the burner when the temperature of the hot air generated by the burner device changes due to a change in temperature, for example, during the drying operation in which grains are dried using the grain ventilation dryer. When adjusting the manual variable resistance in order to reset the upper limit of the operating state of the device, this eliminates burner device malfunctions caused by sudden changes in the rotation of the blower motor and the operation of the electromagnetic pump. There is a particular thing.

In order to achieve this purpose, the grain ventilation dryer according to the present invention operates a control circuit provided with a manual variable resistor that is connected to the circuit of the blower motor, as described above. A capacitor is connected to store a part of the current flowing through the manual variable resistor to the transistor when a potential difference is created between the control circuit and the temperature sensor circuit. This is characterized in that the aforementioned potential difference is slowed down only until the capacitor is charged, thereby preventing the rotation of the blower motor from changing suddenly.

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 for generating the hot air; 5 is a burner device for generating the hot air; 4 is a burner device for generating 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 sends combustion air to the burner device 4; A vacuum chamber 7 formed below the bottom plate 2a of the grain tank 2 made of an air-permeable partition wall is used to blow the hot air through the grain layer as shown by the arrow in FIG. The suction port is connected to the

The burner device 4 includes a pump P for feeding fuel.
The above-mentioned blower 5 is operated by a motor M to supply combustion air, and the pump P that supplies the fuel supplies an intermittent current to an electromagnet or a solenoid to operate a plunger and start the pump. An electromagnetic pump is used to perform the operation, and the electromagnetic pump P is a pilot motor that generates a sine wave output proportional to the rotational speed of the motor M that drives the aforementioned blower 5, as shown in the electrical circuit diagram of FIG. The output signal from the generator TG enters the Schmitt trigger circuit E, is shaped into a square wave by the circuit E, and is passed through the switch circuit F which operates the electromagnetic pump P from the gate 20.
The signal is sent to the sirisk switch 21 provided in the burner device 4, which turns it on and off at the same frequency as the square wave sent out from the pilot generator TG mentioned above.
The amount of fuel supplied to the burner device 4 is controlled to increase or decrease depending on the frequency proportional to the number of rotations of the blower motor M. It is configured so that it relatively increases or decreases in accordance with the increase or decrease in the feeding amount.

G prevents the rotational speed of the motor M of the aforementioned blower 5 from increasing beyond the desired rotational speed, so that the temperature of the hot air generated by the burner device 4 rises above the desired setting temperature. In order to prevent this from happening, the control circuit is equipped with a manual variable resistor R as shown in FIG. It is connected to the circuit m of the motor M so that the current flowing through the transistor 22 provided in the circuit m of the motor M controls the current flowing to the circuit m of the motor M according to the strength of the current.

Further, a sensor circuit S is connected in parallel to the control circuit G, and the sensor circuit S includes a temperature sensor S, such as an IC sensor or a thermistor, which is configured so that the electric resistance decreases as the temperature increases, and the motor M While the temperature detected by the temperature sensor S of this sensor circuit S is low, and therefore the voltage on the control circuit G side is lower than that on the sensor circuit S side, a manual variable resistor R provided in the control circuit G is used. The circuit rotates at a desired rotation speed, and as the resistance decreases due to the temperature rise of the temperature sensor S, the potential difference between the sensor circuit S side and the control circuit G side becomes the same, so that the rotation speed decreases. controlled.

As shown in FIG. 1 above, the temperature sensor S of this sensor circuit S is arranged at an appropriate location on the machine body 1 so as to detect the temperature of the grain stuffed into the grain tank 2. ing.

h is a manual variable resistor when the upper limit of the operating state of the burner device 4, which is set by the manual variable resistor R provided in the control circuit G, is changed and adjusted by operating the manual variable resistor R. In order to slow down the sudden fluctuation in the potential difference that occurs between the control circuit G and the sensor circuit S due to the operation of R, the circuit of FIG. As shown in the figure, a resistor r is provided between the manual variable resistor R of the control circuit G and the transistor 23, and is connected to the control circuit G between the resistor r and the transistor 23. By appropriately selecting the combination of resistor r and capacitor H, the charging time of capacitor H can be set appropriately.
The change in the potential difference that occurs when the variable resistor R is operated is made to be slow until a part of the current flowing to the transistor 23 via the variable resistor R flows to the capacitor H and is completely charged.

In the above circuit diagram (Fig. 3), 24 is a normal AC power supply, 25 is a rectifier, and 26 is a thyrisk switch 2.
1))) This 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 according to the amount of charge.

In addition, the grain ventilation dryer according to the present invention is a grain ventilation dryer that circulates and dries the grains in the above embodiment, but it dries the grains while they are still in the grain tank. The dryer may be a type of dryer, and the type thereof is not limited, and the burner device used is a pot-type burner device in the illustrated embodiment.
Of course, a gun-type burner may also be used.

As explained above, in the grain ventilation dryer according to the present invention, when the manual variable resistor R is operated during the drying operation to lower the upper limit of the operating state of the burner device 4, As described above, the sudden potential difference that occurs between the control circuit G and the sensor circuit S changes slowly due to the capacitor H connected to the control circuit G, so that the operating state of the burner device 4 changes. will smoothly transition to a low combustion state.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a grain ventilation dryer in which the present invention can be implemented, FIG. 2 is a longitudinal sectional front view of the same, and FIG. 3 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, TG... Generator, E...
...Schmitz)) Riga circuit, F...Switch circuit, G...Control circuit, R...Variable resistor, S...Temperature sensor, S... ...Sensor circuit, H...Capacitor.

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 at 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 control 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. In the grain ventilation drying device, which is arranged at an appropriate position in the grain tank to detect the temperature, the manual variable resistor is actuated in a control circuit that regulates the upper limit of the rotation speed of the motor of the blower. 1. A grain ventilation drying device characterized in that a capacitor is connected to slow down a change in potential difference between the control circuit and the temperature sensor circuit that occurs when the temperature sensor is heated.