JPS62153622A - Vaporization burner in grain dryer and the like - Google Patents

Abstract

PURPOSE:To stabilize combustion by pulse signal which supplies fuel by opening an electromagnetic valve in response to the ON-time output of the pulse signal and controls the amount of the blast of a blower. CONSTITUTION:Grain is charged into a grain storage room 2, and respectively a switch (e) is set in accordance with the amount of the charged grain, a switch (f) by the kind of grain, and further a switch (g) according to a target moisture in the grain, and a drying switch (c) is turned ON. Outputs from set conditions, outdoor air temperature and the temperature in a hot blast room 5 are calculated in a central processing unit 36 and results are sent out to respective amplification circuits 38, 39, and 40 to rotate grain feeding rotor 9, a fuel pump 44, and a motor 19 for rotating a vaporization cylinder. A fuel valve 45 is controlled and a blower motor 25 rotated by the output of pulse signal the ON-time of which has been determined. When the fuel is jetted out from a nozzle, the fuel is atomized by the action of a diffusion element 22. When the fuel is blown out of the external end of a vaporization cylinder 21 into a combustion arm body 17, it is ignited by an ignition heater 30. The vaporization cylinder 21 is rapidly heated by the fuel ignition, and the atomized fuel is gasified and then blown out of the holes 24 in a combustion board 23 by means of a blower 27 to achieve complete combustion of the fuel.

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 adjust the amount of fuel supplied by changing the degree of opening and closing of a solenoid valve, or by changing the driving frequency of an electromagnetic pump that supplies fuel. However, with these methods, the maximum ON time cannot be set arbitrarily small due to variations in equipment such as solenoid valves and the relationship with the equipment, so there is a limit in particular on the minimum supply amount. Naturally, you are constrained by the magnification of the maximum supply amount, and the fuel supply amount can only be set within a narrow range, and the fuel supply amount cannot be changed linearly and stably. It was considered 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, the carburetor 21 rotated by the motor 19
In the vaporizing burner 25, which is made up of a diffuser 22, etc., and which supplies fuel and combustion air for combustion, the fuel supply device is connected to the fuel tank 50 via an electromagnetic valve 45, etc., which is opened and closed by a pulse signal. It has a connected configuration,
The blower 27 for supplying the combustion air is configured to operate in conjunction with the motor 25 that changes the rotation speed according to the rotation output of the motor rotation speed control circuit 47 to generate an air volume approximately proportional to the rotation speed, and The structure of a vaporizing burner such as a grain dryer is such that the signal opens the electromagnetic valve 45 to supply fuel according to the ON time output, and controls the air volume of the blower 27 via the motor rotation speed control circuit 47. shall be.

[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 vaporizing tube, and the fuel is supplied according to the ON time output. The combustion air is ignited and combusted while being atomized, accompanied by combustion air from a blower whose rotation is controlled.

After the subsequently supplied fuel collides with the diffuser, it is vaporized while moving along the inner periphery of the sintered cylinder by the above-mentioned high-temperature combustion flame, and transitions to a complete combustion state of blue flame.

Fuel is intermittently supplied from the '6 magnetic valve that opens according to the ON time output, but even if the above intermittent fuel supply continues due to diffusion and atomization by the diffuser and vaporizer cylinder, The supply of atomized fuel or vaporized fuel is continuous, and combustion is stabilized.

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 electromagnetic valve with a small ON time output.

Therefore, the frequency of the pulse signal can be set relatively low (
For example, 15 to 25 Hz), therefore the O of the pulse signal
The variable N time can be set to a large value, that is, it is possible to achieve linear and stable combustion with a considerable combustion range even in a wide range.

In addition, the motor rotation speed can be proportionally changed and controlled according to the ON time of the pulse signal to be supplied with fuel.

Since the blower is configured to be able to generate air volume approximately proportionally in response to changes in the number of revolutions, there is no need to output a special air volume control signal, and the control is simple.

[Embodiment 1] An embodiment of the present invention will be described in detail based on the drawings. 1 is 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 constituted by ventilation plates 6, 6 such as perforated iron plates or wire mesh. It is provided so that the grains in the storage chamber 2 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, into which air is taken in by an exhaust suction fan 8.

Reference numeral 9 denotes a grain delivery rotor, which is located at the lower side of the grain flow path 4 and serves to cause the grain to flow down at a constant speed and discharge it into the grain collecting room 3. 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 moves each part of the conveying helix 1.
0,11. The grain feeding rotor 9, grain lifting machine 13, exhaust suction motor, etc. are transmitted and rotated.

Reference numeral 15 denotes a vaporization type burner, which is constructed as shown in Figs. 4, 5, and 6. To explain this in detail, 16 is a burner main body, and the front end of the cylindrical body is tapered so that the diameter gradually becomes smaller. It has a vent hole on the side 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. 1
Reference numeral 9 denotes a motor for rotating the carburetor cylinder, which is installed within the burner main body 16 by a support frame, and whose rotating shaft 2o is connected to the blower cylinder 1.
8 and protrudes toward the distal end side. Reference numeral 21 denotes a vaporizer cylinder, which is fixed to the tip of the rotary shaft 20 so as to wrap around the rotary shaft 20 and the blower cylinder 18, and a diffuser 22 for atomization is integrally provided at the shaft attachment part at the center of the inside. . Reference numeral 23 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 cylinder 20. This combustion disk is provided with a large number of long holes 24, from which holes 24 are formed. It is provided so that gas can be blown out.

Reference numeral 25 denotes a blower motor, which is fixed to one side of the fan body 26 and whose rotating shaft is inserted into the fan body 26 to drive the motor 2.
A sirocco-type blower 27 that can obtain an air volume approximately proportional to the rotation of the burner body 16 is provided to rotate. The entire body 26 is fixed in one piece.

Reference numeral 28 denotes an intake cylinder whose base is fixed to the outer surface of the fan body 26 on the side opposite to the motor, and whose tip is 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.

Reference numeral 32 denotes a combustion body, which has the burner main body 16 installed therein, is fixed to the outer wall surface on the inlet side of the hot air chamber 5 of the grain dryer 1, and has a net 33 stretched over its rear end surface. Note that the symbol 50 in the figure indicates a fuel tank.

Next, various abnormality detection sensors will be explained. Reference numeral 34 is a high temperature sensor that detects that the inside of the hot air chamber 6 has become abnormally high temperature. Reference numeral 35 denotes a grain packing sensor, which is located in the communication path between the lower transfer helix 10 and the grain lifting machine 13 in the embodiment, and 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. Reference numeral 36 is a central processing unit (usually a CPU), which is equipped with calculation, control, memory, and input/output interfaces. 37 is an input circuit, and 38, 39.40 are output voltage amplification circuits. 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 a set temperature call switch, which is provided so that when this switch is turned on, the drying set temperature during drying is displayed on the display 43.
b is the tensioning switch, C is the drying switch, d is the discharge switch, and e is the tensioning amount setting switch, which is of rotary type so that it can be set in 12 steps according to the amount. f is a grain type setting switch, which is also rotary type so that it can be set in several stages. g is the target moisture setting switch, which sets the moisture content to which the product should be dried.
This switch is also a rotary type and is provided so that it can be set in several stages.

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

Further, the analog/digital circuit 41 is provided with the following three input terminals. That is, j is the hot air temperature sensor voltage, k is the outside air temperature sensor voltage, and 1 is the moisture voltage.

From the amplifier circuit 38, an output signal terminal m of the transmission motor 14,
An operating terminal n for turning on and off the input of the grain feeding rotor 9, an operating terminal 0 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. It is provided.

In addition, 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 bag RR1. It is output based on a pulse signal that is automatically calculated and set to long or short depending on conditions such as the water amount and grain type settings and the voltage input to the analog/digital circuit 41. When the time is long, the electromagnetic fuel valve 45 provided in the discharge side circuit of the fuel pump 44 is opened for a long time, so that a large amount of fuel is supplied from the nozzle at the tip of the fuel supply pipe 29. At the same time, this ON time output is used as the rotational output of the blower motor 25 via the integration circuit 46 and the motor rotational speed control circuit 47.

Further, the strength of the current generated depending on the color of the flame detected by the flame detection sensor 31 is inputted to the motor rotation speed control circuit 47 via the amplification adjustment circuit 48, so that the burner flame always becomes blue. Thus, the rotation of the motor is corrected and controlled.

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 outputted from the motor rotation speed control circuit 4.
7, and when this output is output, the output to other terminals of this amplifier circuit 38 and the output to the amplifier circuit 39 are not output. That is, in other words, the transmission motor 14, the fuel pump 44, and the 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 output after a certain period of time.

Next, I would like to explain the effect on the upper side.

When tensioning 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, the drying switch C is turned on after setting the charging amount setting switch e according to the amount of grain added, and the switch f depending on the type of grain, and setting the switch g according to the target moisture content for further drying. 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, and the output from the grain feeding rotor. 9, the fuel pump 44, and the carburetor rotation motor 19, respectively.

The fuel valve 45 is controlled and the blower motor 25 is rotated by a pulse signal output from the amplification circuit v139 whose ON time is determined according to each condition. and,
When fuel is ejected from the nozzle, it is used to rotate the carburetor cylinder.
The fuel is atomized by the action of the atomizing diffuser 220 in the vaporization tube 21 rotated by the motor 19, and this atomized fuel passes from the outer end of the vaporization tube 21 through the combustion disk 23 and into the combustion arm 17. When it blows out, it is ignited by the action of the ignition heater 30.

When ignited in this way, the vaporized rrJ21 is rapidly heated, so that the atomized fuel in the vaporization tube 21 is gasified, and the blower 27 rotated by the blower motor 25 blows the combustion disk 23. It is blown out from the hole 24 and is completely combusted.

At this time, the ON time control output causes the vaporization burner 1 to
Since the amount of fuel supplied and the amount of combustion air in 5 are always in a constant relationship ratio, when the minimum amount of fuel supplied is 1,
Even if the amount fluctuates by 5 to 6 times this value, complete combustion will occur.

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 collection chamber 3 by the feeding rotor 9, and then transferred to the grain lifting machine 1.
3, it is sent upside down again into the storage chamber 2.

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 9 unexpectedly (This may occur if the engine stops.) From the central processing unit 36 to the transmission motor 14 and the carburetor rotation motor 19
Then, an immediate stop signal for the fuel pump 44 is sent, and the fuel pump 44 is stopped, and the signal to the fuel valve 45 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. The blower motor 25 is rotated by the blower motor 25, and the blower 27 alone blows a predetermined amount of air to the burner without stopping.

Therefore, the gas in the vaporization tube 21 is reliably sent outward through the combustion disk 23 and is 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 bti-OFF 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. In the figure, symbol 1 is the main body of the dryer, 2 is the storage chamber, 3 is the grain collecting 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 1 is a grain frying machine, 15 is a burner, 19 is a motor for rotating the carburetor, 21 is a carburetor, 22 is a diffuser, 25
is a blower motor, 27 is a blower, 44 is an electromagnetic pump,
45 indicates an electromagnetic valve. Figure 3 Figure 1 Figure 2/θ Figure 5 Figure 6

Claims (1)

[Claims] In the vaporizing burner 25, which is composed of a vaporizing cylinder 21 rotated by a motor 19, a diffuser 22 integrated therewith, and the like, and which supplies fuel and combustion air for combustion, the fuel supply device includes an electromagnetic valve 45 that opens and closes in response to a pulse signal. The blower 27 that supplies the combustion air is linked to the motor 25 that changes the rotational speed according to the rotational output of the motor rotational speed control circuit 47, and the blower 27 is connected to the fuel tank 50 via a motor. The pulse signal is configured to generate an air volume proportional to each other, and the pulse signal is applied to the electromagnetic valve 4 according to its ON time output.
5 is opened to supply fuel, and the air volume of the blower 27 is controlled via the motor rotation speed control circuit 47.