JP2003322311A - Gun type burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gun type burner for preventing the turn-around of flames at their outside and producing no soot. <P>SOLUTION: The gun type burner comprises a burner outer cylinder 1, a burner inner cylinder 4 provided inside thereof via a secondary air passage 5 formed between itself and the burner outer cylinder 1, a plurality of primary air holes 9 provided in the burner inner cylinder 4, a nozzle body 8 and a stabilizer 10 provided inward from the burner inner cylinder 4 for injecting fuel and for turning primary air, respectively, and a blower 2 provided rearward from the burner outer cylinder 1 for supplying combustion air. The secondary air passage 5 is tapered to be gradually narrower as tending to the front end. A flame retaining air blow port 15 is provided at the final end of the secondary air passage 5 in a gap between the burner outer cylinder 1 and the burner inner cylinder 4. Furthermore, the front end of the burner inner cylinder 4 is protruded frontward from the burner outer cylinder 1 and inclined to the outside of a sheath to form a guide member 16 for guiding flame retaining air. Thus, the turn-around of the flames formed at their outside is prevented and no soot is produced, resulting in good combustion. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gun type burner which is used as a burner for a household water heater or the like. 2. Description of the Related Art Conventionally, in this kind, as disclosed in Japanese Patent No. 2828865, for example,
A burner inner cylinder is formed by forming a secondary air passage between the burner outer cylinder and the burner outer cylinder, and a plurality of primary air holes are further provided at the bottom of the burner inner cylinder, and a fuel A nozzle body for injection and a stabilizer for swirling the primary air are provided. Further, a blower for supplying combustion air is provided behind the outer cylinder of the burner. An air hole was provided to achieve good combustion while reducing noise during combustion. [0003] In this conventional device, the tip of the burner inner cylinder protrudes forward.
It is inclined inward, and a tertiary air hole is formed immediately outside, but since it does not guide this tertiary air, the flame with a long fire foot formed in the front is outward. The flame spreads outside and wraps around the burner side, causing soot. Also, the tertiary air supplied to this flame has a low jet output, and the supply position is not the outer periphery of the flame but the middle, and the flame wraps around. As a result, there is a problem that a large amount of soot is deposited on the outer periphery of the burner outer cylinder. In order to solve the above-mentioned drawbacks, the present invention focuses on this point. In particular, the present invention has a structure in which a secondary air passage is provided between a burner outer cylinder and the burner outer cylinder. The burner inner cylinder is further provided with a plurality of primary air holes, and a fuel injection nozzle body and a stabilizer for swirling the primary air are provided inward of the burner inner cylinder. In a device provided with a blower for supplying combustion air at the rear of the outer cylinder, the secondary air passage is formed so as to be tapered so as to gradually narrow toward the front end, and at the final end of the secondary air passage. Defines a flame-holding air outlet from the gap between the burner outer cylinder and the burner inner cylinder, and further projects the distal end of the burner inner cylinder forward from the burner outer cylinder and slightly outwardly. It is a guide piece that guides the flame holding air by being inclined. According to this, tertiary air with a high flow rate from the flame-holding air jet is guided to the guide plate outside the flame formed in front of the gun type burner, and the blast is reliably blown outside the flame. In this way, it is possible to prevent sneaking to the burner side and eliminate the generation of soot to always obtain good combustion. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a gun-type burner mounted downward according to the present invention. Reference numeral 1 denotes a burner outer cylinder having a bottomed cylindrical shape narrowed in three stages toward the tip.
An inlet 3 through which the combustion air from the air flows is formed. Reference numeral 4 denotes a burner inner cylinder provided with a tapered secondary air passage 5 formed between the burner outer cylinder 1 and the burner outer cylinder 1. A nozzle body 8 is connected and sprays fuel oil pressure-fed from an electromagnetic pump 7 into the rectifying cylinder 6, and a part of air supplied from the inflow port 3 flows into the upper surface of the rectifying cylinder 6 as primary air. A plurality of primary air holes 9 are provided. Reference numeral 10 denotes a burner inner cylinder 4 in front of the nozzle body 8.
The stabilizer provided in the inside, the injection hole 11 in the center
A plurality of swirling blades 12 for swirling and supplying primary air are provided on the outer periphery of the injection hole 11, and a plurality of flow holes 13 are provided on the outer periphery of the swirling blade 12. Reference numeral 14 denotes a secondary air hole formed in the peripheral wall of the burner inner cylinder 4 in front of the stabilizer 10 and has a plurality of large and small holes.
The secondary air passage 5 on the outside is narrowed by one step. Reference numeral 15 denotes a flame-holding air outlet formed by a gap between the burner outer cylinder 1 and the burner inner cylinder 4 for supplying tertiary air to the flame formed at the final end of the secondary air passage 5. The tip end of the burner inner cylinder 4 projects forward from the burner outer cylinder 1 and is inclined slightly outward to form a guide piece 16 for guiding the flame holding air. Reference numeral 17 denotes a nozzle 1 having a front end facing the front of the nozzle body 8.
A pair of ignition electrodes. Reference numeral 18 denotes a can wall of a water heater or the like having a gun type burner attached downward. Next, the operation of the embodiment of the present invention will be described. If the blower 2 and the electromagnetic pump 7 are driven now, primary air is supplied into the burner inner cylinder 4 through the primary air hole 9, and fuel oil is sprayed from the nozzle body 8,
The sprayed fuel is mixed with the swirling primary air by the stabilizer 10 and ignited by the discharge of the electrode 17 to perform primary combustion. The flame after the primary combustion is subjected to the secondary combustion by the secondary air supplied from the secondary air hole 14 at the tip of the burner inner cylinder 4 through the secondary air passage 5, and a large flame is directed outward. Is formed. The flame is supplied with flame-holding air from the flame-holding air outlet 15. However, the secondary air passage 5 is blown out because the secondary air passage 5 is sufficiently narrowed to reach the flame-holding air outlet 15. Since the flow rate of the tertiary air is extremely high, and furthermore, it is reliably guided to the outside of the flame by the guide piece 16, the wrap around the burner outside the flame is prevented. Therefore, it is possible to reliably prevent soot accumulation due to the wraparound of the outside of the flame, which is likely to occur particularly when the gun-type burner is used with the gun-type burner attached downward, and good combustion is always performed for a long period of time. It can be used with confidence. As described above, according to the present invention, tertiary air having a high flow rate from the flame holding air jet is guided to the guide plate outside the flame formed in front of the gun type burner. Then, the air is surely blown to the outside of the flame and is prevented from wrapping around the burner, so that good combustion is always obtained by eliminating the generation of soot.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a gun type burner to which one embodiment of the present invention is applied. [Description of Signs] 1 Burner outer cylinder 2 Blower 4 Burner inner cylinder 5 Secondary air passage 8 Nozzle body 9 Primary air hole 10 Stabilizer 15 Flame holding air outlet 16 Guide piece

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Claims (1)

Claims: 1. A burner inner cylinder is formed inside a burner outer cylinder by forming a secondary air passage between the burner outer cylinder and the burner inner cylinder. In addition to providing a hole, a nozzle body for fuel injection and a stabilizer for swirling primary air are provided inside, and a blower for supplying combustion air is provided behind the burner outer cylinder. The secondary air passage is formed in a tapered shape so as to gradually narrow toward the front end, and a flame holding air jet is formed at a final end of the secondary air passage from a gap between the burner outer cylinder and the burner inner cylinder. A gun-type bar having an outlet, and a guide piece for guiding the flame holding air by projecting the tip of the burner inner cylinder forward from the burner outer cylinder and inclining slightly outward. Na.