JPH0362964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device that performs premix combustion.

2. Description of the Related Art A premix combustion device used in a conventional oil fan heater or the like is constructed as shown in FIG. That is, in FIG. 5, 1 is a burner head, and 1a is a throat provided at the bottom of the burner head 1, which serves as an inlet for the mixed gas into the burner head 1. 2 is a vaporizer cylinder that vaporizes kerosene and performs premixing. 3 is an ignition device that ignites the mixed gas that has passed through the burner head 1.

The operation of the combustion apparatus configured as described above will be explained below.

First, a mixed gas premixed in the vaporizer cylinder 2 flows into the burner head 1 through the throat portion 1a. Here, the cylindrical burner head 1 has flame openings 1 distributed evenly around the entire circumference.
b is provided, the mixed gas is distributed almost equally over the entire circumference, and after passing through the burner head 1b,
Go outside. At this time, the ignition device 3 performs an ignition operation to ignite the air-fuel mixture.

Problems to be Solved by the Invention However, in the above conventional configuration, the ignition operation is performed only in the part where the ignition device 3 is present, and the mixed gas flowing in the other circumferential direction is ignited near the ignition device 3 on the outer periphery of the burner head 1. This means that the flame ignited at 1 is not ignited until it propagates to adjacent unburnt gas in sequence. As a result, when the ignition conditions are poor, a flame propagation delay occurs, and the unburned mixed gas corresponding to the delay is discharged into the air as white smoke.

The present invention solves the above conventional problems,
The purpose is to eliminate the generation of unburned gas during ignition.

Means for Solving the Problems In order to achieve this object, the combustion apparatus of the present invention is provided with a flow suppressing metal fitting between the mixed gas inlet and the flame hole on the opposite side of the burner head from the igniter. .

Effects According to the above, the present invention suppresses the flow toward the flame port side opposite to the igniter at the time of ignition, and there is a time lag in the mixed gas flowing out from the flame port between the igniter side and the opposite side. will occur. Therefore, no unburned mixed gas is ejected until the flame formed in the igniter unit propagates to the opposite side, and ignition white smoke can be prevented.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 4, 4 is a cylindrical mixing/vaporizing cylinder with an open top (hereinafter referred to as a vaporizing cylinder), 5 is a sheathed heater embedded in this vaporizing cylinder 4, and 6 is the vaporizing cylinder 4. This is an air passageway that supplies combustion air to the air blower 7 and communicates with the blower 7. 8
is a fuel pipe that supplies fuel to the carburetor cylinder 4, and communicates with a fuel tank 10 via a pump 9.
11 is a burner case surrounding the outer periphery of the vaporization cylinder 4;
A burner head 2 covers the upper opening of the vaporization cylinder 4, and is formed into a bottomed cylindrical shape with a small-diameter mixed gas inlet 12a, and an inner wire mesh 13 and an outer wire mesh 14 are attached to the peripheral wall 12b. A plurality of flame holes 12c are formed. Reference numeral 15 denotes an ignition electrode, the tip of which is located at the center of the outlet of the flame hole 12c. Reference numeral 16 denotes a semicircular flow suppressing metal fitting provided at a position opposite to the ignition electrode 15, and has a semicylindrical bent portion 16a larger than the inner diameter of the mixed gas inlet. In the figure, 17 is a frame rod, and 18 is a ground ring fitted to the outer periphery of the opening of the vaporizing tube 4.

The operation of the combustion apparatus configured as described above will be described above.

First, the sheathed heater 5 is energized, and the vaporizer cylinder 4
When the temperature rises to a certain set value, the pump 9 supplies fuel from the fuel pipe 8 into the vaporization cylinder 4, and at the same time, the blower 7 sends combustion air through the air passage 6. The fuel is vaporized in the vaporization cylinder 4, mixed with combustion air, and passes through the mixed gas inlet 12a. Here, since a semi-cylindrical flow suppressing fitting 16 is provided on the outer periphery of the mixed gas inlet at a position opposite to the ignition electrode 15, the flow in this portion is suppressed. That is, the time it takes for the flame to reach the flame hole 12a is delayed compared to the ignition electrode side. As a result, a flame is formed in the flame hole on the ignition electrode 15 side and spreads to the adjacent flame hole, and when the flame spreads to the flame hole in the opposite direction to the ignition electrode 15, the mixed gas arrives at this flame hole portion. become. Therefore, the generation of mixed gases that would otherwise occur due to the time delay that occurs when the flame propagates around the burner head 12 is eliminated. This can prevent the white smoke phenomenon when ignited.

In the above embodiment, the flow restraint fitting 16 is a metal fitting having a semi-cylindrical rise, but the flow restraint fitting 16
may have a cylindrical shape with only the ignition electrode 15 open.

Effects of the Invention As described above, the present invention can prevent the generation of white smoke due to the spout of unburned mixed gas during ignition without changing the shape of the burner head, flame hole, etc. Furthermore, by flowing the mixed gas at the time of ignition to the ignition electrode side, ignitability is also improved, and it is possible to provide a combustion device with excellent ignitability especially when the mixture is lean or at low temperatures.

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of the essential parts of a combustion device according to an embodiment of the present invention, Fig. 2 is a sectional view showing the entire combustion device, Fig. 3 is a plan view of the burner head, and Fig. 4 is a plan view of the burner head. FIG. 5 is a cross-sectional view of the combustion device in a conventional configuration. 4... Carburizer cylinder, 12... Burner head, 12a
...Mixed gas inlet part, 12c... Flame hole, 15...
...Ignition device, 16...Suppression fitting.

Claims (1)

[Claims] 1. A vaporizing cylinder having an opening, a burner head attached to cover the opening of the vaporizing cylinder,
The burner head is equipped with flame holes provided approximately evenly around the entire circumference of the peripheral wall, and an ignition device for igniting the mixed gas ejected from the flame holes, and a mixed gas inlet in the burner head on the opposite side from the ignition device. A combustion device in which a flow suppressing metal fitting is installed between the flame hole and the flame hole so that the mixed gas jetted out from the flame hole on the opposite side of the igniter is jetted out slightly later than the mixed gas jetted out from the flame hole on the side of the ignition device.