JPS60138288A - Vaporizing type oil burner - Google Patents

Abstract

PURPOSE:To decrease a value of change in the delivery amount of a solenoid operated pump so as to realize stable combustion, by correcting a driving pulse of the solenoid operated pump, which supplies fuel, in accordance with a change of power supply voltage. CONSTITUTION:A driving circuit 1 for a solenoid operated pump P is constituted by providing a phototransistor Tr1 which controls a switching element S of the solenoid operated pump P. The phototransistor Tr1 in this driving circuit 1 inputs power supply voltage through a power supply voltage reader to a main unit combustion control circuit which outputs an optical pulse controlling the driving circuit 1. Then the circuit is constituted so as to automatically adjust a width of the optical pulse corresponding to a change of this power supply voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a vaporizing combustor for liquid fuel (eg petroleum).

<Prior art> Conventional electromagnetic pumps for vaporizing combustors have had the disadvantage that stable combustion cannot be achieved due to fluctuations in the discharge amount of the electromagnetic pumps because no measures have been taken to deal with fluctuations in the power supply voltage of the drive circuit. Ta.

[Object 1] So, the present invention provides a vaporization type combustor that can achieve stable combustion by reducing fluctuations in the discharge amount of an electromagnetic pump even if the power supply voltage of the electromagnetic pump drive circuit fluctuates by one bit. ]”
It has been the target.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1.3, I (is a heater for heating the vaporizer;
S V N is the solenoid valve needle, FM is the moon flow blower, ■ (state is the igniter, RYI, RY2, RY
3 is a relay. P is an electromagnetic pump that pumps the liquid fuel to the vaporizer, and 1 is a pump drive circuit that turns on and off the electromagnetic filter for operating the plunger, which directly turns on and off the electromagnetic coil. A switching element S is provided, and the switching element S is configured to be directly controlled by a control signal from the microcomputer ICI of the combustion control circuit 2 of the main body. And 22
& A diode D1 that directly half-wave rectifies the power supply, a fundenzer C1, and resistors RI and R2 are provided. The switching element S is composed of a seven-dimensional trannostar Tri, and a transistor Tr2 whose collector and emitter are connected in series with the electromagnetic coil of the electromagnetic pump P, and whose base is connected to the emitter of the Tr1, 1 The phototransistor Trl has its base set to (])N.OF L, its 0N by the action of the light from the light emitting element which is turned (-)N.OF by the microcomputer ICI.
-Concentrically with the OFF state, the electromagnetic coil is configured to turn ON and 01 by turning 1r2 ON and OFF. Furthermore, a safety device F is connected in series to the coil of the electromagnetic pump P.

The electromagnetic pump F' is started and stopped by sending a pulse signal in the microcomputer C1 to the transistor Tr when the vaporizer thermistor detects that the temperature is above a certain level.
By controlling the transmission to the base of i, the switching element S starts (-)N・01"F, and when the temperature difference between the room temperature thermistor and the room temperature setting device is large, the ON・QF of the switching element S is started. For example, the frequency of F is 2
In addition to S 1+7, the switching element S (-
)N・(moon?) The frequency of F is reduced to, for example, 611z and the electromagnetic pump is controlled weakly.

Note that the drive circuit 1 of the present invention is not limited to the one shown in FIG.
For example, it may be configured as shown in FIG. In other words, the commercial power supply is not used as is for the power supply voltage for the drive circuit 1;
A low power supply voltage is obtained by the transformer T, and this is applied to the drive circuit 1.
It is also possible to configure the drive circuit 1 to operate by inputting control pulses from the microcomputer TCI of the Honjojiyaki control circuit 2 to the base of the transistor 'c3 as the switching element S. good.

In this example, a low-voltage type can be used for Runsister 'F'r3, and it is possible to lower the drive circuit voltage and electromagnetic pump drive voltage, so as shown in Figure 1. It is possible to configure the circuit without using the 7-way transistor Trl.

As mentioned above, the present invention provides a vaporizer/liquid fuel
A drive bar drive circuit 1 that drives an electromagnetic pump P for pumping the fuel, and a microcomputer 01 of a main body combustion control circuit 2 that outputs pulses that control the drive circuit 1, wherein the drive circuit The value of the power supply voltage for 1 is input to the analog input port of the main combustion control circuit 2 through the power supply voltage reader: It is configured to automatically adjust the pulse width.

Next, the operation will be explained with reference to FIGS. 1 and 3 and flowchart 1 in FIG.

Plug the power outlet into an AC power source. Then, a voltage is applied to the terminals X and Y of the power transformer of the electronic circuit of the main body combustion control circuit 2, and the power source for the electronic circuit becomes usable.

When the operation switch is turned on, the microcomputer IC of the combustion control circuit 2 of the main body is activated, and at the same time, the operation lamp is lit. Then, start counting the time. When the heater circuit is activated at the same time, PR is 'ONL, TR
Since an output force is applied to the gate of 4-, TR becomes conductive and energization of heater I starts. At the same time, R)'1 is turned on, L and RY2 are turned on.'
ζ, since the solenoid valve needle SVN is energized, its nozzle (not shown) is closed.

The thermistor installed in the vaporizer keeps the temperature above a certain level.
If it is detected, the ignition operation count is started, and then the power supply voltage (2) is checked and the control pulse IITS for the electromagnetic pump P is selected. For example, power supply voltage \"=\;
A (VA=104.9V or more), the control pulse (
The width Ts of frequency 2f'1l-1z) is Ts=A(A=6
．． 6m5), also V-\'B (\7B=94.9~]
(') 4.9V), then Ts=B (B-7ms), and if \"2\7C (V C = 94., ri V or less), then Ts = C (C = 7.4m5) Then, this control pulse is selected as
from I to the light emitting element forming a photocoupler with the transistor Trl, and the transistors Tr1,
Tr2 is also turned on and off to drive the electromagnetic pump P.

At the same time or after a certain period of time, RY3 is turned ON and the energization to the solenoid valve needle S V N is stopped, and at the same time, the igniter 1 (marked 11, -) is energized and the gas ejected from the vaporizer 7 nozzle 1-1 is removed. The gas is supplied to the burner and discharged from the burner flame hole.This gas flows into the igniter 1.
9. When combustion starts, the flame resistance Ri' is compared with the ignition level R1o, and R+≦I
-<t, o, and if it is determined that there is a flame, RY 2 is OI' F” I,, igniter] (:N is stop 1-
Convection blower 1-Pape 4 starts.

During combustion, the output of the heater circuit changes by the carburetor thermistor, and the heater 1-] is controlled by turning ON the output to PR (> F F ).The electromagnetic pump P is controlled by the output from the microcomputer ICJ. Therefore, the transistors Tr],']'r2 continue to drive with the same size (-) OF Check.

When the operation switch is turned OFF, the heater 1il control output and pump control output from the microcomputer ICI are stopped, so the electromagnetic pump P is stopped.
The power supply to heater H-\ is also stopped. At the same time R)' 2
(11) N L,, R)' 3 is OFF L, convection blower 1-゛M is stopped, solenoid valve needle S V
Since N is energized, the carburetor 7 is closed, and at the same time, the internal pressure of the carburetor is released to the outside of the carburetor through the solenoid valve needle SvN, so the gas jetting from the carburetor is stopped and combustion is also performed at the same time. Stop. After 120 seconds, relays RYi and RY2 are turned to (-)F, and energization to solenoid valve needle SVN is also stopped.

In addition, taking advantage of fluctuations in the power supply voltage for the electromagnetic pump drive circuit,
If the width of the control pulse is not adjusted, as shown in Figure 5, the voltage fluctuation at a certain constant pressure PC will be May 1-1] 1)
When it is ±10% like \・", the discharge amount of the electromagnetic pump P fluctuates by about 15%. However, this is due to the control pulse frequency 2 r) l-1z and the pulse width 7 ms.
It's time. In addition to this voltage fluctuation, there are variations in the individual power supply voltages of about 5% to 1()%, so in the worst case, the
% to 25% of the discharge amount, and in reality -1- is difficult to design due to large air volume, burner flame hole load, and other conditions.

However, in the present invention, as described above, the value of the power supply voltage for the drive circuit is transmitted to the combustion control circuit 2 through the power supply voltage read-through type 3.
The sixth combustion control circuit 2 is configured to adjust the pulse width of the control pulse output in response to fluctuations in the power supply voltage.
As shown in the figure, even if the voltage fluctuation of the power supply voltage fluctuates by ±10%,
Fluctuations in the discharge amount of the electromagnetic pump at a certain constant pressure Pc are within about ±5%.

The other adjustment conditions are the power supply voltage ＼゛-＼“l＼(＼
"A = ] f-, 14, 9V or more"-), the width Ts of the control pulse (frequency 2 (i Hz) is Ts = A
(A=6.6m5), and ＼゛=＼“B(VB=94.
5) ~ I (1, 4, 9■), then Ts=B (B=7
+ns), also \“two\” C(\' C= 94,
9 v or less), select Go5=C (C=7.4m5). Since it is programmed in the microcomputer IC1 in this way, the change in the discharge amount due to the voltage fluctuation of the electromagnetic pump P becomes small, and the design of the vaporization type combustor becomes easy.

In addition, Figures 7 (A), (B), and (C) represent the control pulse output voltage for the electromagnetic pump drive circuit from the microcomputer ICI of the smoke control circuit 2. FIG. 7(A) shows the output status during normal times, and FIGS. 7(B) and (0) show the output status during abnormal times. In the case of FIG. 7(A), the transistors Tri and Tr2 in FIG. 1 are ON/O.
F P and the electromagnetic pump P is driven normally.

However, in the case of Figure 7 (B), the microcomputer I
When the CI is abnormal, the output voltage is low and there is no output, so the transistors Tr1 and Tr2 are not turned on, and the electromagnetic pump P is not driven and is naturally extinguished, causing no problem.

In addition, in the case of Figure 7 (C), the microcomputer IC
Since the output of I continues to be output, the electromagnetic pump P continues to be energized. Therefore, the planter (shown in the figure) inside the electromagnetic pump P is only attracted in one direction, the electromagnetic pump P is not driven, and the combustion naturally extinguishes, but the electromagnetic pump P continues to be energized. It is thought that the electromagnetic pump P or the transistor may have been burned out as a secondary cause. In the case of Fig. 2, the transformer may have been burnt out. In order to protect against the destruction of such secondary parts, if safety devices such as current fuses, temperature fuses, and POSISTORs are installed as shown in Figures 1 and 2, secondary parts will be destroyed in the event of an abnormality in the microcomputer. Destruction can be prevented II-.

<Effects> As is clear from the explanation in 1- below, the present invention includes a drive circuit that drives an electromagnetic pump for pumping liquid fuel to a vaporizer, and a control circuit that outputs pulses that control the drive circuit. The value of the power supply voltage for the drive circuit is input to the control circuit, and the control circuit is configured to automatically adjust the pulse width of the control pulse output in response to fluctuations in the power supply voltage. .

Therefore, according to the present invention, even if there is a fluctuation in the source voltage of the drive circuit of the electromagnetic pump, there is an excellent effect of reducing the fluctuation value of the discharge amount of the electromagnetic pump and realizing stable combustion.

4. Brief description of the drawings Figure 1 is an electric circuit diagram showing an embodiment of the present invention, Figure 2 is a block diagram showing a modification of the electromagnetic pump drive circuit,
Figure 1 is a flowchart, Figure 6 is a diagram showing the discharge characteristics of the electromagnetic pump when the present invention is not used, and Figure 6 is a diagram showing the discharge characteristics of the electromagnetic pump when the present invention is not used.
7(A) is a diagram showing the discharge characteristics of the electromagnetic pump when the present invention is used. FIG. 7. Figures (B) and (0) are also diagrams showing abnormal conditions.

1: Drive circuit, 2: Main body combustion control circuit, 3: Power supply voltage reading knowledge, DJ, D2: Diode, TCI: Microcomputer, P: Electromagnetic pump, S switching element,
Trl+Tr2. Tr3:) Lang Star.

Applicant: Sharp Corporation Agent medium + 4 permanent Figure 4 S TA RT start to luck Bigu Ein f:tl T=+0 Me VA V = Va V = Road 10,000 = A Ts = B Ts = C Figure 1 Figure 2

Claims (1)

[Claims] The drive circuit includes a drive circuit that drives an electromagnetic pump for pumping liquid fuel to a vaporizer, and a control circuit that outputs pulses that control the drive circuit, and a power supply voltage value for the drive circuit is input to the control circuit. A vaporizing combustor, wherein the control circuit is configured to automatically adjust the pulse width of the control pulse output in response to fluctuations in the power supply voltage.