JPH0256568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a vaporizing burner in a grain dryer or the like.

[Prior art and its problems] Conventionally known vaporizing burners vary the amount of combustion by changing the amount of fuel supplied. For example, the amount of fuel supplied is adjusted by changing the driving frequency of an electromagnetic pump that supplies fuel. or turn on this electromagnetic pump
Time control methods were used, but with these methods, the driving frequency and ON time limit settings cannot be reduced blindly due to variations in equipment such as solenoid valves and the relationship with the equipment. There are restrictions on the maximum supply amount, and the fuel supply width can only be set within a narrow range, and the fuel supply amount cannot be changed linearly and stably. The width of the blue flame was made small.

Furthermore, as mentioned above, since the amount of fuel supplied is not stable, in order to maintain the appropriate amount of air from the blower, it is necessary to supply combustion air while outputting a rotation control signal for the blower drive motor. It was also difficult to set the air volume according to the amount of fuel supplied.

[Means for Solving the Problems] The present invention takes the following technical means to solve the above-mentioned drawbacks. That is, in the vaporizing burner 25, which is composed of a vaporizing cylinder 21 rotated by a motor 19, a diffuser 22 integrated therewith, and supplies fuel and combustion air for combustion, the fuel supply device is connected to the fuel tank. The structure includes an electromagnetic pump 44, which receives fuel under pressure from the electromagnetic pump 44, and an electromagnetic valve 45 that opens and closes in response to a pulse signal. The pulse signal is connected to a motor 25 that changes the rotation speed by changing the rotation speed, and is configured to generate an air volume approximately proportional to the rotation speed.
5 is opened to supply fuel, and the air volume of the blower 27 is controlled via the motor rotation speed control circuit 47.

[Operations and Effects of the Invention] When fuel is supplied according to the ON time output of the pulse signal, the fuel collides with the rotating diffuser and scatters while being guided by the rotation of the vaporizer cylinder, resulting in the above-mentioned effect.
The combustion air is ignited and burnt while being atomized, accompanied by combustion air from a blower whose rotation is controlled according to the ON time output. After the fuel that is subsequently supplied collides with the diffuser, it is vaporized while moving along the inner periphery of the vaporization cylinder by the high-temperature combustion flame, and transitions to a complete combustion state of blue flame.

Fuel is intermittently supplied from the electromagnetic valve that opens according to the above ON time output, but even if the above intermittent fuel supply continues as the diffusion and atomization are performed by the diffuser and vaporization tube for a while, the mist will not disappear. The supply of vaporized fuel or vaporized fuel becomes continuous, and combustion becomes stable.

In this way, in a burner equipped with a diffuser and a vaporizing tube, blue flame combustion is possible even by opening and closing the solenoid valve with a small ON time output. The state is maintained, and its magnitude is determined by the opening and closing of a solenoid valve.For this reason, the frequency of the pulse signal can be set relatively low (for example, 15 to 25 Hz), and therefore the pulse signal is turned on.
It is possible to set a wide variable range of time, that is, linear and stable combustion is possible with a considerable combustion range even in a wide range.

In addition, the blower is configured so that the motor rotation speed can be changed and controlled proportionally according to the ON time of the pulse signal to supply fuel, and the air volume can be generated almost proportionally in response to changes in the rotation speed. Therefore, there is no need to output a special air volume control signal, and the control is simple.

[Embodiment] An embodiment of the present invention will be described in detail based on the drawings. Reference numeral 1 indicates a main body of a grain dryer. 2 is a grain storage room, 3 is a grain collection room, and 4 is a grain flow path, which is located between the storage room 2 and the grain collection room 3, and has left and right sides made up of ventilation plates 6, 6 such as perforated iron plates or wire mesh. storage chamber 2
It is designed so that the grains inside can flow down. 5 is a hot air chamber into which hot air is sent from a burner 15, which will be described later.

Reference numeral 7 denotes an exhaust chamber, which is designed to be sucked in by an exhaust suction fan 8.

Reference numeral 9 denotes a grain feeding rotor, which is located at the lower side of the grain flow path 4 and flows grains down at a constant speed into the grain collection chamber 3.
It is discharged to 10 is a lower transfer helix provided at the bottom of the grain collection chamber 3, and 11 is an upper transfer helix provided at the ceiling of the storage chamber 2. 12 is a diffusion vane. Reference numeral 13 denotes a grain lifting machine, which is erected to connect the transfer end of the lower transfer helix 10 of the grain collecting room 3 and the transfer start end of the upper helix 11 of the storage chamber 2.

Reference numeral 14 denotes a transmission motor, which operates the transfer helices 10 and 11 of each part, the grain feeding rotor 9, and the grain lifting machine 1.
3, an exhaust suction motor, etc., are transmitted and rotated.

Reference numeral 15 denotes a vaporizing burner, which is constructed as shown in FIGS. 4, 5, and 6, and will be explained in detail as follows.
Reference numeral 16 denotes a burner main body, which has a cylindrical shape with a tapered cylindrical shape so that the diameter gradually decreases on the front end side, and a vent hole is provided on the side surface of the rear end. Reference numeral 17 denotes a combustion arm, which is fixed to the front end surface of the burner main body 16.

Reference numeral 18 denotes a blower tube that protrudes from the center of the combustion arm 17 and is fixed to the burner body 16 together with the combustion arm 17. Reference numeral 19 denotes a motor for rotating the carburetor cylinder, which is installed within the burner main body 16 by a support frame, and is provided such that its rotating shaft 20 passes through the blast cylinder 18 and projects toward the tip side. Reference numeral 21 denotes a vaporizing cylinder, and the rotating shaft 20 and the blowing cylinder 1 are connected to the tip of the rotating shaft 20.
8, and a diffuser 22 for atomization is integrally provided at the shaft attachment part at the center of the inner side. 2
Reference numeral 3 denotes a combustion disk, which is fixed to the inside of the combustion arm 17 and has a slight gap between it and the vaporizing tube 20. This combustion disk is provided with a large number of long holes 24.
The gas is blown out from here.

Reference numeral 25 denotes a blower motor, which is fixed to one side of the fan body 26 and has a rotating shaft inserted into the fan body 26 to obtain an air volume approximately proportional to the rotation of the motor 25. The fan body 26 is integrally fixed to the burner body 16 with the air outlet of the fan body 26 aligned with the vent of the burner body 16.

Reference numeral 28 denotes an intake cylinder, the base of which is fixed to the outer surface of the fan body 26 on the side opposite to the motor, and the tip thereof positioned near the side surface of the combustion arm 17.

Reference numeral 29 denotes a fuel supply pipe, and its discharge port is provided close to the rotating peripheral surface of the atomizing diffuser 22.

30 is an ignition heater, and 31 is a flame detection sensor.

32 is a combustion body, inside which the burner body 1 is placed.
6 is constructed and fixed to the outer wall surface of the entrance side of the hot air chamber 5 of the grain dryer 1, and a net 33 is stretched over the rear end surface. Note that the symbol 50 in the figure indicates a fuel tank.

Next, to explain the various abnormality detection sensors, there are 3
Reference numeral 4 denotes a high temperature sensor which detects that the inside of the hot air chamber 6 has become abnormally high temperature. Reference numeral 35 denotes a grain clogging sensor, which in the embodiment is located in the communication path between the lower transfer helix 10 and the grain lifting machine 13, and is a sensor that detects when this portion is clogged with grain and cannot be transferred. In addition, a flame detection sensor, an air volume detection sensor, an abnormal load sensor, etc. are provided.

Next, the electric control device will be explained based on FIG. 7. 36 is a central processing unit (usually CPU),
Contains control, memory, and input/output interfaces. 37 is an input circuit, 38, 39, 40
is an output voltage amplification circuit. 41 is an analog-to-digital conversion circuit, 42 is an oscillation circuit, and 43 is a display device.

The input circuit 37 is provided with an input terminal connected to each of the following switches and an input terminal connected to the abnormality detection sensor. That is, a is the set temperature call switch, and this switch
When turned on, the drying temperature setting during drying is displayed on the display 43.
It is set up so that it is expressed in b is the loading switch, c is the drying switch, d is the ejection switch, e
is a rotary type setting switch for setting the amount of filling, and can be set in 12 steps depending on the amount. f is a grain type setting switch, which is also rotary type so that it can be set in several stages. A target moisture setting switch g is used to set the moisture content to which the drying process should be carried out. This switch is also of a rotary type and is provided in several stages.

h is a terminal connected to the high temperature sensor 34, and i is a terminal connected to the grain clogging sensor 35.

In addition, the analog/digital circuit 41 includes the following three
input terminals are provided. That is, j is the hot air temperature sensor voltage, k is the outside air temperature sensor voltage, and l is the moisture voltage.

From the amplifier circuit 38, the output signal terminal m of the transmission motor 14 and the input of the grain feeding rotor 9 are turned on and off.
An operating terminal n for the fuel pump 44, an operating terminal o for the fuel pump 44, an output signal terminal p for the carburetor rotation motor 19, and an output terminal q for the ignition heater 30 are provided.

Further, another amplifier circuit 39 receives the output for fuel control of the vaporizing burner 15 and the output of the blower motor 25 from the central processing unit 36, and this output is
The ON time is a pulse signal that is automatically calculated and set to long or short depending on conditions such as the setting of the filling amount, target moisture content, and grain type, and the voltage input to the analog/digital circuit 41. When this ON time is long, the electromagnetic fuel valve 45 provided in the discharge side circuit of the fuel pump 44 remains open for a long time, and a large amount of fuel is output from the nozzle at the tip of the fuel supply pipe 29. supply is becoming available. Also, at the same time, this ON
The time output passes through an integration circuit 46 and a motor rotation speed control circuit 47 and is used as the rotation output of the blower motor 25.

Furthermore, the strength of the current generated by the color of the flame detected by the flame detection sensor 31 is input to the motor rotation speed control circuit 47 via the amplification adjustment circuit 48, so that the burner flame is always maintained. The rotation of the motor is corrected and controlled so that the color becomes blue.

The terminal r outputted from the amplifier circuit 38 is a terminal outputted when the high temperature sensor 34 becomes abnormally high temperature, and this terminal r is inputted to the motor rotation speed control circuit 47. When this output is output, the output to other terminals of the amplifier circuit 38 and the output to the amplifier circuit 39 are not output. That is, in other words, the transmission motor 1
4, fuel pump 44 and carburetor rotation motor 19
When the blower motor 25 is stopped, only the blower motor 25 is provided to rotate. Of course, this output timer circuit (not shown) may be used to prevent the output from being output after a certain period of time.

Next, to explain the effect of the above example, first,
When the loading switch b is turned on, the transmission motor 14 of the dryer rotates, and each rotating part is driven from this.

Therefore, the grain to be dried is put into the hopper of the grain lifting machine 13 and pushed into the storage chamber 2. Next, set the filling amount setting switch e according to the amount of grain added, switch f according to the type of grain, and set the switch g according to the target moisture content for further drying, and then turn on the drying switch c. . Then, the central processing unit 36 calculates these setting conditions, the outside temperature, the temperature inside the hot air chamber 5, and the output from the moisture meter 49, and sends appropriate outputs to each amplifier circuit 38, 39, 40, 9, the fuel pump 44, and the carburetor rotation motor 19, and turn on the amplifier circuit 39 according to each condition.
The fuel valve 45 is controlled by the timed pulse signal output, and the blower motor 2
Rotate 5. When the fuel is ejected from the nozzle, it is atomized by the action of the atomization diffuser 22 into the vaporization tube 21 which is rotated by the vaporization tube rotation motor 19, and the atomized fuel is Vaporizer cylinder 2
The combustion arm body 17 passes through the combustion plate 23 from the outer end of the combustion arm body 17.
When it blows inward, it is ignited by the action of the ignition heater 30.

When ignited in this way, the carburetor 21 rapidly
As the fuel is heated, the atomized fuel in the vaporization tube 21 is gasified and blown out from the hole 24 of the combustion disk 23 by the blower 27 rotated by the blower motor 25 to be completely combusted. That will happen.

At this time, the amount of fuel supplied to the vaporizing burner 15 and the amount of combustion air are always maintained at a constant relationship ratio based on the ON time control output, so when the minimum amount of fuel supplied is 1, the amount of fuel supplied is 5 to 5. Even if it fluctuates six times, it will still be completely burned.

In this way, the hot air is blown into the hot air chamber 5 to dry the grains flowing down through the grain flow path 4. The dried grains are discharged into the grain collecting chamber 3 by the feeding rotor 9, and sent back into the storage chamber 2 by the grain lifting machine 13.

On the other hand, the hot air that has passed between the grains in the grain flow path 4 is discharged to the outside of the machine by the suction fan 8. As described above, the grains are gradually dried while being circulated.

During such drying, when it is detected that the temperature in the hot air chamber 6 has become abnormally high (for example, the flame from the burner spreads to the grain in the grain flow path, or the grain delivery rotor unexpectedly 9 stops.) The central processing unit 36 sends an immediate stop signal to the transmission motor 14, the carburetor rotation motor 19, and the fuel pump 44. The signal is turned off and closed.

At this time, the blower motor 25, which is transmitted and rotated by receiving the same signal as the fuel valve 45, should also be stopped, but the abnormal signal causes the central processing unit 36 to output a special output to the terminal r. , whereby the blower motor 25 is rotated, and the blower 2
Only No. 7 blows a specified amount of air to the burner without stopping. Therefore, the gas within the vaporization tube 21 is reliably sent outward through the combustion disk 23 and reliably combusted outside the vaporization tube 21. Further, the remaining fuel that comes out in a small amount from the nozzle is also gasified and ejected from the combustion disk 23, where it is also burned.

It goes without saying that when the drying switch b is turned off when drying is stopped, only the blower motor 25 may be rotated for a long period of time and then stopped, as in the case of stopping when an abnormality is detected.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a partially cutaway front view, Fig. 2 is a sectional view thereof, Fig. 3 is a partially cutaway side view, and Fig. 4 is a vaporizing burner section. 5 is a rear view, FIG. 6 is a front view of the main parts, and FIG. 7 is an electric circuit diagram. Symbols in the figure: 1 is the dryer body, 2 is the storage chamber, 3 is the grain collection room, 4 is the grain flow path, 5 is the hot air chamber, 6 is the ventilation plate, 7 is the exhaust chamber, 8 is the exhaust suction fan, 13 is a grain lifting machine, 15 is a burner, 19 is a motor for rotating the carburetor, 21 is a vaporizer, 22 is a diffuser, 25 is a blower motor, 27 is a blower, 44 is an electromagnetic pump, 4
5 indicates a solenoid valve.

Claims (1)

[Claims] 1. In the vaporizing burner 25, which is composed of a vaporizing cylinder 21 rotated by a motor 19, a diffuser 22 integrated therewith, and supplies fuel and combustion air for combustion, the fuel supply device is connected to the fuel tank. The configuration includes an electromagnetic pump 44 and an electromagnetic valve 45 that opens and closes in response to a pulse signal in response to the pressurized fuel from the electromagnetic pump 44. The pulse signal is configured to operate in conjunction with a motor 25 that changes the rotation speed to generate an air volume approximately proportional to the rotation speed, and the pulse signal opens the electromagnetic valve 45 to supply fuel according to its ON time output, and A vaporizing burner for a grain dryer or the like configured to control the air volume of the blower 27 via the motor rotation speed control circuit 47.