JPH0327809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid fuel combustion device with a small petroleum water heating function.

Conventional structure and its problems Conventionally, as a liquid fuel combustion device such as a small oil water heater, liquid combustion is sprayed into the combustion chamber by a nozzle for a gun-type burner, and combustion air is swirled from a combustion tube installed in the center. The swirling force premixes air and fuel, and a portion of the combustion waste gas is recirculated to the lower part of the combustion chamber to vaporize the fuel, which is then stored in the upper part of the combustion tube. This type of flame combustion has the advantage that it does not require auxiliary heating means such as a heater, so the combustion start-up time is short and easy to control. It takes around 5 minutes for the oil pool to completely vaporize and disappear, during which time the air-fuel ratio may be disturbed and the combustion characteristics may deteriorate, or fire extinguishing operations may be required before the oil pool is cleared. When this was done, unburned gas was generated for several minutes, creating a pungent odor.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate oil pools at the initial stage of ignition in a short time, eliminate the drawbacks of the conventional burners described above, and provide a burner with good ignition start-up characteristics.

Structure of the Invention In order to achieve this object, the present invention provides an oil receiving tray that is in close contact with the lower part of the combustion tube and above the lower opening of the auxiliary combustion tube. With this configuration, the unvaporized oil at the initial stage of ignition is received in the oil pan, and since the oil pan is provided above the lower opening of the auxiliary combustion tube, the temperature rises quickly and the oil accumulated in the oil pan is drained quickly. It has the effect of evaporating over time.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In Figures 2 and 3, 1 is a water can wall, 2 is a combustion chamber, 3 is a combustion tube installed in the center of the combustion chamber, and on its outer periphery there is a cut-out 4 with an opening for blowing out air in the tangential direction. There are many. 5
A fuel supply device supplies fuel into the combustion chamber 2 by spraying fuel fed under pressure by a pump (not shown) through a nozzle 6. Reference numeral 7 denotes an auxiliary combustion tube, which is provided around the combustion tube 3 concentrically with the combustion tube 3, and has an opening 8 in the part facing the fuel supply device 5, and an exhaust gas recirculation port 9 in the lower part. . 10 is an air supply device that supplies air to the combustion tube 3; 11 is an oil tray that is in close contact with the lower part of the combustion tube 3 and is provided above the exhaust gas recirculation port 9; 12 is a bottom plate of the combustion chamber; and 13 is an ignition device. It is.

The operation of the above configuration will be explained below.
When the water can wall 1 is filled with water, air is supplied to the combustion tube 3 by the air supply device 10, fuel is sprayed into the combustion chamber 2 by the fuel supply device 5, and ignited by the ignition device 13. At the initial stage of ignition, diffusion combustion occurs in front of the nozzle 6, and after a few seconds, the temperature of the combustion chamber 2 rises, the injected fuel B is vaporized in the auxiliary combustion tube 7, and the swirling airflow A blows out from the lower part of the combustion tube 3. The mixture is flame-stabilized by a large number of cut-and-raised parts 4 on the upper part of the combustion tube 3, and ignition combustion occurs. At this time, a part of the combustion exhaust gas passes through the recirculation port 9 of the auxiliary combustion tube 7 to raise the temperature inside the auxiliary combustion tube, and an oil receiving tray 11 provided in close contact with the lower part of the auxiliary combustion tube 3
to raise the temperature in a short time. Therefore, the oil that collides with the combustion tube 3 at the initial stage of ignition and flows to the bottom without being vaporized is caught by the oil receiving tray 11, and as described above,
Since the temperature of the oil pan 11 rises to 200° C. or more in a short time, the oil accumulated in the oil pan 11 evaporates quickly.

Effects of the invention (1) Since the pool of unvaporized oil at the initial stage of ignition is cleared in a short time, there is little disruption of the air-twist ratio balance at the start of ignition, and it is possible to reduce CO at the time of ignition and reduce odor at the time of ignition.

(2) Since there is no oil pool even if the fire is extinguished within 2 to 3 minutes after ignition, there is no residual unburnt gas generated after the fire is extinguished, and the odor from extinguishing can be reduced.

(3) Even if the fuel supply amount of the fuel supply device is reduced, the oil stagnation time is short, and a variable heat generation function can be easily incorporated.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a conventional example, FIG. 2 is a front sectional view showing an embodiment of the present invention, and FIG. 3 is a top sectional view of the same. 2...Combustion chamber, 3...Combustion tube, 4...Cut up, 5...Fuel supply device, 7...Auxiliary combustion tube, 8...
Opening portion, 9...exhaust gas recirculation port, 10...air supply device, 11...oil receiving tray.

Claims (1)

[Claims] 1. A combustion chamber, a combustion tube erected in the center of the combustion chamber, a number of cut-outs provided on the outer periphery of the combustion tube and having openings in the tangential direction of the outer periphery of the combustion tube, and a side wall of the combustion chamber. a fuel supply device for supplying atomized fuel toward the combustion tube; an air supply device for supplying air to the combustion tube; an exhaust gas recirculation port at a lower portion and an opening at a position relative to the fuel supply device; A liquid fuel combustion device comprising an auxiliary combustion tube provided concentrically around a combustion tube, and an oil tray closely attached to a lower part of the combustion tube and provided above the exhaust gas recirculation port of the auxiliary combustion tube.