JPS6046339B2 - Combustion control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device that automatically switches to gas-oil combustion using gas fuel such as city gas or propane gas and petroleum fuel.

Recently, combustors that gasify and burn oil have been commercialized, but because they use electric heaters to gasify oil, it takes a long time of 10-b minutes to reach the temperature where it can be gasified. Therefore, when this combustor is used as a heater, it takes too much time to actually provide heating.

The present invention was made in view of this point, and involves starting combustion using gas fuel until the temperature reaches a point at which petroleum can be vaporized.
After that, it was possible to switch to cheap petroleum fuel, and it was also made possible to burn only with gas fuel when the petroleum ran out, and it was also made so that when the propane gas ran out, there was no need to heat immediately. In some cases, the present invention relates to a control device that enables oil combustion from the beginning.

The following explanation will be given based on the circuit diagram in the drawings. S is a rotary type combustion selection switch having multiple contact mechanisms, and the first contacts 1, 1, 2, and 2 are for gas combustion to switch to oil combustion after gas combustion. - It is for oil combustion, the second contact 2A, mouth, C, 2 is for gas combustion, and the third contact 3A, mouth,
C. The second one is for oil combustion.

1 is a burner motor that removes residual exhaust gas in the combustion chamber (pre-purge) prior to combustion and sucks combustion air.

The first and second contacts 12 and 22 of the selection switch S are connected in series to the parallel circuit of the normally open combustion thermostat 2. 3
is an igniter, 4 is an electromagnetic gas valve, 5 is an electromagnetic oil valve,
Reference numeral 6 denotes an oil pump, each of which is controlled by a wind pressure switch 7 that detects the drive of the burner motor 1.

A control circuit 8 controls the igniter 3, and controls an ignition switch 9 and an ignition changeover switch 10.

Reference numeral 11 denotes a control relay that switches and operates a valve switching contact 12 that switches between the gas valve 4 and the oil valve 5, and the first and third contacts 1a and 3a of the selection switch S cause the temperature of the vaporization chamber to reach the vaporization temperature by combustion heat. It is connected in series with a normally open switching thermostat 13 that responds when the switch is turned on.

Three third contacts of a selection switch S are connected in parallel to this switching thermostat 13. Reference numeral 14 denotes an electric heater that heats the vaporization chamber to the vaporization temperature when burning petroleum fuel, and is connected in series to the third contact 3C of the selection switch S and the heater thermometer 15.

Reference numeral 16 denotes a hot air fan motor, which is driven by a delay thermostat 17 that heats the combustion chamber to a predetermined temperature.

18 is a power switch, and 19 is a power source.

Next, the operation will be explained.

A: When switching from gas combustion to oil combustion.

First, the combustion selection switch S is switched to the first contact 1, 1, 2, 2.

Next, when the power switch 18 is turned on, the burner motor 1 is driven through the first contact 12 of the selection switch S, and the residual exhaust gas in the combustion chamber is removed and pre-purged, and at the same time, the air pressure switch 7 is closed by blowing air. When the pre-purge is completed, the control circuit 8 closes the ignition switch 9. Then, the igniter 3 is activated and the electromagnetic gas valve 4 is opened to supply gas to the burner, which is ignited by the igniter 3 to start gas combustion. When the flame is ignited, the flame rod in the control circuit 8 detects the flame, thereby opening the ignition switch 9 and switching the ignition selector switch 10, so that the gas valve 4 is maintained in operation and gas combustion continues. When the vaporization chamber of the burner section reaches the vaporization temperature of oil due to the gas combustion heat, the switching thermostat 13 is closed and the control relay 11 is energized via the first contact 1a of the selection switch S and the switching thermostat 13. The valve switching contact 12 is switched from one contact to the other to stop the gas supply, operate the pump 6, and open the petroleum valve 5, so petroleum fuel is supplied to the vaporization chamber and gasified to the bar. It continues to be burned as petroleum vaporized gas.

When the combustion chamber reaches a predetermined temperature, the delay thermostat 17 is closed and the warm air fan motor 16 is driven to supply warm air to the room.

Therefore, when the combustion selection switch S is turned to the first contact side, it is possible to automatically switch from gas fuel to petroleum fuel, and heating can be started immediately after combustion starts, and then it is possible to switch to cheaper petroleum fuel. can. When burning only with B gas fuel.

Switch the combustion selection switch S to the second contact 2A, 2, 2, and turn on the power switch 18.

Then, combustion using the gas fuel starts in the same manner as in the operation A described above. The relay 11 that controls the switching contact 12 of the valve is not supplied with power even when the switching thermostat 13 is closed, and gas combustion continues until the end. Such gas combustion is effective when oil runs out. C When burning only with petroleum fuel.

Switch the combustion selection switch S to the third contacts 3A, 3, C, 2 and turn on the power switch 18.

Then, the heater 14 for heating the vaporization chamber is energized to heat the vaporization chamber, and the control relay 11 is energized via the third contacts 3A and 3 of the selection switch S, and the valve switching contact 12 is energized.
Switch to the oil valve 5 side. When the vaporization temperature is reached in this state, the combustion thermostat 2 is closed and the burner motor 1 is driven to perform pre-purging. After that, in the same way as in the operation A, the oil pumped up by the pump 6 passes through the valve 5, reaches the vaporization chamber, is supplied to the burner, and is ignited by the igniter 3.
Thereafter, the control circuit 8 continues to supply oil to carry out oil vaporization and combustion. Such oil combustion is advantageous as an inexpensive combustor when gas is out of stock, when gas is difficult to obtain, or when heating is not required immediately after combustion. The present invention is as described above, and at the time of ignition, gas fuel is used to ignite and burn in a very short time, and then when the temperature of the vaporization chamber reaches the vaporization temperature of oil, the combustion is automatically switched to oil combustion. Therefore, during the initial operation at the time of ignition, heating can be quickly performed by gas combustion.

Additionally, by automatically switching to cheaper oil combustion and continuing combustion, the fuel consumption cost is lower than that of gas fuel. That is, the present invention takes advantage of the short ignition time, which is an advantage of gas fuel, and the low cost, which is an advantage of petroleum fuel. We can provide cheap combustion equipment.

[Brief explanation of the drawing]

The figure is an electrical circuit diagram of the combustion control device of the present invention. 1...Burner motor, 3...Igniter, 4
・・・・・・Gas fuel supply element (gas valve), 5, 6
・・・・・・Oil fuel supply element (oil valve), 8 ・
...Control circuit, 9 ...Ignition switch,
10...Ignition selector switch, 11...
Control relay, 13...Switching thermostat.

Claims (1)

[Claims] 1. A burner motor that supplies combustion air to the vaporization chamber, a switching thermometer that detects the temperature of the vaporization chamber, a control relay that is energized when the switching thermometer is closed, and a control relay that ignites after a predetermined time has elapsed from the start of driving the burner motor. A control circuit that closes a switch, an igniter that is activated by closing the ignition switch, an ignition switch whose contacts are switched by the control circuit after a predetermined period of time has elapsed from the time the ignition switch is closed, and the control circuit. When the relay is de-energized, it is connected to the gas fuel supply element that supplies gas fuel to the vaporization chamber through one contact of the changeover switch, and when the relay is activated, it is connected to the gas fuel supply element that supplies gas fuel to the vaporization chamber through the other contact of the changeover switch. A combustion control device comprising a valve switching contact switchably connected to a petroleum fuel supply element for supplying petroleum fuel to a vaporization chamber.