JPH0344981Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a combustion device such as a domestic water heater or a hot air fan.

Conventional structure and its problems Conventionally, this type of combustion equipment is shown in Figures 1, 4, and 5.
It is constructed as shown in FIG. That is, the fuel sprayed from the nozzle 21 mixes with the air flow from the air jet hole 5 of the vaporization tube 4, and
However, since the burner ignition device 22 faces the combustion chamber, the electrodes 22a of the burner ignition device 22,
During long-term use, soot and gas from ignition and combustion may adhere to the electrode mounting body 22c between the electrode mounting bodies 22b and 22b.
The insulation resistance value between the electrodes 22a and 22b decreases, and when igniting, the spark is not properly positioned at the tip of the electrode, causing ignition failure in the area where soot or gas has adhered between the electrodes 22a and 22b. It was something that would happen.

Purpose of the invention The present invention aims to eliminate these conventional problems, and to obtain good ignition without causing leakage of spark from the electrode.

Structure of the invention In order to achieve this object, the present invention provides a plurality of electrodes facing each other on the front end surface of an insulating electrode mounting body, and also makes the electrode mounting body portion located between the electrodes concave. A part of the combustion air is blown from all circumferential directions of the recessed part.

Due to this structure, even if the flame during combustion is directed toward the ignition electrode, the mounting body between the electrodes is concave, so soot and gas are less likely to adhere to the grooves, especially on the side surfaces. Furthermore, since a portion of the air sent from the fan casing enters the recess, soot and gases are blown away by the wind and become even more difficult to adhere to, making it difficult to maintain insulation between the electrodes even during long-term use. This eliminates any drop in resistance and allows normal ignition.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 7.

In the figure, 1 is a nozzle serving as a liquid fuel atomizing means, and the liquid fuel sent from an oil tank by an electromagnetic pump is sprayed from the tip of the nozzle 1. Reference numeral 2 denotes a can body, 3 a burner insertion tube attached to the can body 2, and 4 a vaporizing cylinder erected in the central part of the combustion chamber of the can body. A large number of air injection holes 5 are provided on the peripheral wall of the vaporization tube 4, and the air from the air injection holes 5 and the fuel from the nozzle 1 mix, and the combustion flame is directed from the vaporization tube 4 toward the inner wall of the combustion chamber. It is formed by Reference numeral 6 denotes an outer broach tube attached to the burner insertion tube 3, and a combustion detector 7 is attached to this outer broach tube 6. A flange 8 is attached to the burner insertion pipe 3. 9 is a motor, 10 is a fan attached to the motor 9, 1
1 is a fan casing, which is attached to the flange 8. 12 is the outer brooch 6
This is a smaller inner broach tube attached to the fan casing 11. Further, the fan casing 11 is provided with an air supply hole 13 for supplying air to the inner broach tube 12. Reference numeral 14 designates a plurality of ventilation holes provided in the circumferential side wall of the inner broach tube 12. 15 is a burner ignition device that generates a spark at the start of combustion, and a plurality of electrodes 15b and 15c are provided on the front end surface of an insulating electrode mounting body 15a, and the shape of the electrode mounting body 15a between the electrodes is concave. This concave portion is prevented from entering inside the front end surface of the inner broach tube 12, and further,
It is provided so as to be located at the outlet of the air passage A formed by the inner broach tube 12 and the outer broach tube 6. Reference numeral 16 denotes an air blowing passage serving as a combustion air passage to the carburetor cylinder.

Next, the operation will be explained.

The air sent from the fan 10 is divided into the vaporization cylinder 4 through the air passage 16 and the inner broach tube 12 through the air supply hole 13. On the other hand, the liquid fuel sprayed from the nozzle 1 is mixed with the air from the air jet hole 5 of the vaporizer cylinder 4, and is ignited by the burner ignition device 15 provided in the inner broach tube 12, thereby performing steady combustion. It is. At this time, the air sent to the inner broach tube 12 passes through the vent hole 14 and travels through the air passage A between the inner broach tube 12 and the outer broach tube 6, and then passes through the burner ignition device 15 on the side facing the combustion chamber. is discharged into the combustion chamber through the concave portion of the electrode mounting body 15a. Therefore, even if a flame is formed on the combustion chamber wall from the vaporization tube 4, the soot and unused gas in the recessed portion are blown away by the air passing through the vent hole 14, thereby preventing the soot and unused gas from adhering. Furthermore, since the sides of the concave portion are not perpendicular to the flame, it is difficult for soot to adhere to them. Therefore, even during long-term use, there is no possibility that soot or gas may adhere between the electrodes 15b and 15c, resulting in a decrease in insulation resistance. Note that FIG. 7b shows the bottom of the concave portion further expanded in the lateral direction.

Effects of the invention In this invention, the electrode mounting body between the electrodes is made concave, and a part of the combustion air is blown from the entire circumferential direction of the concave part, so a large amount of soot and gas can enter between the electrodes. This prevents adhesion and ensures good ignition with a normal spark even during long-term use.

Furthermore, since the present invention does not require a separate device dedicated to air blowing, the structure is simple and compact.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the boiler, Figs. 2 and 3 are a plan sectional view and a side sectional view of the main part of an embodiment of the present invention, and Figs. 4 and 5 are main parts of the conventional boiler. FIG. 6 is a perspective view of a conventional burner ignition device, and FIGS. 7a and 7b are perspective views of a burner ignition device according to an embodiment of the present invention. 1...Nozzle, 6...Outer broach tube, 11
...Fan casing, 12...Inner broach tube, 13...Air supply port, 14...Vent hole, 15...
Burner ignition device, 15a... Electrode mounting body, 15
b, 15c...electrode, A...ventilation path.

Claims (1)

[Scope of utility model registration request] A burner, a burner ignition device having a plurality of opposing electrodes and a concave electrode mounting body located between the electrodes, a can body with a combustion chamber inside, and a fan for feeding combustion air inside. a burner insertion tube having a flange on the side of the fan casing, passing through the can body and facing the combustion chamber, and fixed to the can body; and a burner insertion tube arranged between the burner insertion tube and the burner. , comprising an inner broach tube and an outer broach tube having a plurality of ventilation holes in a circumferential side wall, the inner broach tube,
The outer broach tube and the burner insertion tube are sequentially arranged approximately concentrically around the burner, and are connected to an air passage formed between the inner broach tube and the outer broach tube through which air sent from the fan to the inner broach tube is guided. A combustion device in which an outlet portion is formed by curving an inner broach tube and an outer broach tube inward, and a concave portion of the electrode attachment body is located at the outlet portion.