JPH0116903Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a liquid fuel combustion device equipped with a vaporization type burner, and particularly relates to the configuration of this vaporization type burner.

<Prior art> Conventionally, in a vaporization type burner, atomized liquid fuel is supplied into the burner, and a heater installed in the burner vaporizes the supplied fuel, and a blower or other blower is used to vaporize the supplied fuel. Primary combustion air was supplied to the burner, and the vaporized fuel and air were mixed and combusted. By the way, in conventional burners, the heating control of the heater is used to generate a mixed gas of a constant concentration and perform constant combustion, but as the combustion time elapses, the burner, especially the burner equipped with flame holes, There is a risk that the head will be heated to a considerably high temperature and the combustion speed will gradually increase, causing a flashback phenomenon, and it is extremely difficult to control the heating of the heater, making stable combustion control impossible. Furthermore, since the burner head is heated to a considerably high temperature, problems arise in the lifespan of the burner head, making it impossible to perform stable combustion over a long period of time.

<Purpose> The present invention was developed in view of the above points, and by lifting a portion of the flame formed by the burner, it is possible to prolong the life of the burner and achieve stable combustion. The purpose is to provide a combustor.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

The figure is a sectional view of a main part of an embodiment of the present invention. In this figure, 1 is a burner unit and 2 is a blower unit. This burner unit includes a combustion chamber 3 equipped with a heat exchanger etc., a burner 4, and this burner 4.
The blower unit 2 is an integrated unit with a burner cover 5 that surrounds the blower duct 6, a blower fan 7 installed inside the blower duct 6, and a motor 8 that drives the blower fan 7. The tip of the air duct is connected to the burner cover 5 via a gasket 9. The burner 4 is disposed within a burner cover 5 with a burner head 11 having a plurality of flame holes 10 around it facing the combustion chamber 3, and a heater 12.
are buried together. A primary air supply pipe 13, which is an L-shaped pipe, is connected to the side of the burner 4, and the interior space of the burner cover 5 and the interior space of the burner 4 are communicated through this supply pipe 13. 14 is a re-supply pipe erected from the bottom 4a of the burner 4 toward the burner head 11,
The tip is formed to extend to the burner head 11 side, and the inside of the cover 5 and the inside of the burner 4 are communicated through this re-supply pipe 14. Reference numeral 15 denotes a flow regulating member provided at the center of the inner surface of the burner head 11 facing the resupply pipe 14, and is shaped like a container with a U-shaped cross section. Reference numeral 16 denotes a tubular burner cap with a V-shaped cross section, which homogenizes the mixed gas supplied to the flame hole 10. Numeral 17 is a fuel supply nozzle through which fuel such as liquid or atomized kerosene is supplied into the burner 4. 18 is a spark plug, and 19 is a secondary air supply hole that communicates the interior space of the cover 5 with the combustion chamber 3. Secondary air for combustion is supplied into the combustion chamber 3 through this supply hole 19.

Next, the operation of the combustor having the above configuration will be explained. First, the burner 4 is heated by energizing the heater 12 of the burner 4, and the motor 8 drives the fan 7 to close the burner cover 4.
Air is supplied into the burner 4, while liquid or atomized fuel is supplied from the fuel supply nozzle 17 into the burner 4. Here, the fuel supplied into the burner 4 is heated by the heater 12 and vaporized, mixed with air flowing in from the primary air supply pipe 13 and supplied to the flame hole 10. Here, when the burner 4 reaches a certain temperature or the mixed gas inside the burner 4 reaches a predetermined concentration, the spark plug is ignited and combustion is started. Here, fuel and air are sequentially supplied to perform combustion, and air is also supplied into the burner 4 from the resupply pipe 14. The air supplied into the burner 4 from this re-supply pipe 14 once hits the rectifying member, reverses its direction by 180 degrees, joins the mixed gas here, and is supplied to the center side a of the flame hole 10. It turns out.

Therefore, the concentration of the mixed gas supplied to the central side a of the flame hole 10 is diluted by the air flowing in from the resupply pipe 14, and the mixed gas supplied to the outer circumferential side b is supplied at a normal concentration. As a result, the flame formed in the flame hole 10 has a slow burning speed on the center side a, and is formed at a distance from the flame hole 10, which is a so-called lifted state, and the flame lingers on the outer peripheral side b. It is formed in such a way that it is in the same state.

Therefore, since part of the flame is stuck and part is in a lifted state, the burner head 11 is prevented from becoming hot due to the lift without being extinguished by the lift. In other words, since part of the flame is stuck at the outer periphery b, it does not go out, and because the center side a is in a lifted state and the air flowing in from the resupply pipe 14 has a cooling effect, the burner head 11 The central part of the core will not be heated to extremely high temperatures and will be kept at a relatively low temperature. Therefore, since the burner head 11 is at a relatively low temperature, stable combustion can be performed without increasing the combustion speed due to overheating, and the life of the burner can be extended. Further, even if the combustion speed of the vaporized gas changes to some extent by controlling the heating of the heater 12 of the burner 4, it is neutralized to some extent by the air flowing in from the re-supply pipe 14, so that the combustion width can be increased.

In addition, in the embodiment of the present invention, a re-supply pipe is provided at the center of the burner so that the flame on the center side formed in the flame hole is in a lifted state, but the present invention is not limited to this, and the flame on the outer periphery side is in a lifted state. In other words, it is sufficient if a part of the flame is in a lifted state.

<Effects> According to the present invention, fresh air is supplied to a part of the mixed gas near the flame holes of the burner head to reduce the concentration of a part of the mixed gas, and the flame formed in each flame hole is reduced. By keeping a portion of the burner head in a lifted state, the area near each flame hole of the burner head can be maintained at a relatively low temperature, thereby extending the life of the burner and stabilizing the combustion rate of the mixed gas. It is possible to obtain stable combustion conditions and to increase the combustion width. Moreover, since only a portion of the flame formed in each flame hole is lifted and the rest remains, there is no danger of the flame extinguishing, which is a very excellent idea in practical terms.

[Brief explanation of the drawing]

The drawing is a sectional view of a main part of an embodiment of the present invention. 4: burner, 10: flame hole, 14: resupply pipe.

Claims (1)

[Claim for Utility Model Registration] Fuel and combustion air are supplied to the burner, and both are vaporized and mixed within the burner to produce a mixed gas, which is then supplied to multiple flame holes formed in the burner head. A re-supply pipe having an open end is provided within the burner and near the burner head, and new air is introduced through the re-supply pipe near the flame hole of the burner head. The air is supplied to a part of the mixed gas, and the supply of air lowers the concentration of a part of the mixed gas to bring a part of the flame formed in each of the flame holes into a lifted state. liquid fuel combustion equipment.