JPS5947202B2 - How to ignite a gun type burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gun-type burner in which liquid fuel is pressurized by an electromagnetic pump, sprayed from a nozzle, and ignited by spark discharge.

Conventionally, in gun-type burners that perform combustion using such a method, a method has been used in which, upon ignition, a power supply voltage is suddenly applied to an electromagnetic pump, the oil pressure is increased, and fuel is sprayed.

However, with this method, ignition noise may occur when igniting, or
It had drawbacks such as producing smoke and causing backfires.

The present invention has been made with the aim of eliminating such drawbacks.

That is, the oil pressure is gradually raised by an electromagnetic pump at the time of ignition, and combustion is started during this rise, thereby preventing the above-mentioned drawbacks.

The present invention will be explained below with reference to an embodiment shown in FIG.

1 is an AC power supply, 2 and 3 are diodes, 4 is an electromagnetic pump coil, 5 is a resistor, 6 and 7 are transistors, 8, 9, 1
0.11 is a resistor, 12 is a diode, 13 is a capacitor, 14, 15, 16°17 is a resistor, and 18 is a capacitor.

19 is a switch, which is synchronized with an ignition device (not shown).

Explain the operation of the circuit.

When the switch 19 is turned on, the alternating current supplied from the alternating current power supply 1 is half-wave rectified by the diode 2, passes through the diode 3゜12, stores charge in the capacitor 13, and at the same time flows a pace current into the transistor 7 through the resistor 11. , transistor 7 is ONL, transistor 6 is also O
NL, the terminal voltage of the coil 4 of the electromagnetic pump rises to the power supply voltage as shown in FIG.

Next, after a certain time constant determined by the capacitor 13, the transistor 6.7 is turned off, and the terminal voltage of the coil 4 drops to the voltage divided by the resistor 5.

Further, the half-wave rectified voltage passes through the resistor 17 and is stored in the capacitor 18, so that the base voltage of the transistor 7 increases, the collector voltage of the transistor 6 gradually decreases, and conversely, the terminal voltage of the coil 4 gradually decreases. At the same time, the oil pressure also gradually increases.

It ignites at a certain point, and then gradually continues to rise.

When the transistor 6 is saturated, the power supply voltage is completely applied to the coil 4, resulting in steady combustion.

In this way, the ignition is made at a lower value than the oil pressure (oil amount) during steady state, and the voltage applied to the electromagnetic pump is gradually increased, so that the oil pressure (oil amount) is also gradually increased as much as possible. Therefore, even if the fuel does not ignite at the predetermined value for some reason, it will ignite during the rise, that is, it will always ignite at a lower value than during steady state.

Therefore, it is possible to obtain a gun-type burner that does not generate ignition noise, emit smoke, and does not cause backfire when ignited.

To give an example, when the steady state oil pressure is 7 kg/crtt, and the oil flow is 4.21/h, the oil pressure at ignition is 3 kg/cr7t.
By setting the oil amount to 3 l/h, ignition noise etc. could be prevented.

Further, the time from turning on the switch 19 to steady state is 6 seconds.

This time can be shortened. Note that if the minimum value of the voltage applied to the coil of the electromagnetic pump is too high, the above-mentioned ignition effect will not be achieved when the power supply voltage becomes high.

Also, if it is too low, it will take a long time to ignite, which may cause the ignition to not ignite within the safety switch timing of the combustion control device, or cause the electromagnetic pump to stick, so be careful when setting the above minimum value. Need to decide.

In addition, in this embodiment, as mentioned earlier, the power supply voltage is once applied to the coil of the electromagnetic pump and the electromagnetic pump is driven in the same way as in normal operation. It is effective.

In one example, the power supply voltage is applied for three pulses.

7.1'Although ignition may occur when this power supply voltage is applied, it is not a problem as it is a small flame.

Further, the voltage applied during steady state may be lower than the power supply voltage, and it goes without saying that the voltage applied initially may be lower than the voltage during steady state as long as the above-mentioned problems can be prevented.

As described above, the present invention applies the first voltage to the coil of the electromagnetic pump for the first time in response to the combustion command, and then applies the first voltage to the coil of the electromagnetic pump.
The second voltage is lower than the voltage of It can prevent biting and stickiness.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the relationship between time and electromagnetic pump coil terminal voltage according to the embodiment of FIG. 4... Coil of electromagnetic pump.

Claims (1)

[Claims] 1 In response to a combustion command, a first voltage is applied to the coil of the electromagnetic pump for a first time, and then a second voltage lower than the first voltage is applied, and then gradually increased, and after a certain time, the motor starts running. A method of igniting a gun type burner characterized by increasing the voltage to a constant voltage.