JPS58133509A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To accurately carry out ignition of the titled device and hold stable combustion for a long period of time by drawing the ignition electrode close to the upstream side of a spiral air current from the injection nozzle, and providing a flame holding part at the downstream side of the spiral air current of an opening of an auxiliary burning cylinder. CONSTITUTION:The positional relationship between an injection nozzle 14 and an ignition electrode 18 lies in that the ignition electrode 18 is disposed so that it is disposed at the air upstream side from turning air currents (A) and (B) injected through air holes 8 and 8' of a combustion cylinder 5 and also slightly spaced apart from a combustion fine grain group 12. A part of a combustion flame ignited forms a small flame (D) at one side of an opening 13 of an auxiliary combustion cylinder 10 that is, a flame piloting part 13' provided at the air downstream side of turning air currents (A) and (B). By this procedure, ignition can be surely performed, and since misfiring and pulsating combustion are not generated during a period from the initial period of combustion to stable combustion. Furthermore soots and the like do not adhere to the peripheral wall of the combustion cylinder, so stable combustion during a long period of time can be positively performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device using a spray nozzle.

Conventionally, in a liquid fuel combustion device that uses a combustion tube that injects a swirling air flow and has multiple air holes in the peripheral wall, the air flow exiting from the air holes of the combustion tube is swirling, so the combustion device If it is cold, or if the re-ignition or bad fire conditions overlap, even if the fuel particles ejected from the spray nozzle are ignited, the combustion tube will continue to rise and fall until it reaches a flame-holding temperature. Until the combustion chamber reaches a stable combustion atmosphere, pulsating combustion occurs, producing a large amount of harmful gas and soot, and creating pulsating combustion noise.

The present invention solves these conventional problems, and improves the ignitability of a liquid fuel combustion device using a spray nozzle during the transition period, and prevents the generation of large amounts of soot.

In order to achieve this object, the present invention has a combustion tube that injects a swirling air flow erected in the center of the combustion chamber, and an auxiliary combustion tube that has an opening and a flame-holding section outside of the combustion chamber. Then, from the spray nozzle toward the opening of the auxiliary combustion tube, a group of fuel particles is injected to form a group of fuel particles with a constant injection angle and spray distribution, and an ignition electrode is placed on the windward side of the airflow that hits the group of fuel particles. , a group of fuel particles is ignited by the spark of the ignition electrode, a part of the combustion flame is held in the -1 end and the flame holding part, and then the combustion flame is transmitted to the air hole part of the combustion tube.

Therefore, ignition can be performed smoothly no matter how bad the ignition conditions are.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. First, in FIG. 1, numeral 1 denotes a cylindrical water heater can, which together with a cylindrical inner wall 2 constitutes a double-cylindrical ice chamber. Inside the inner wall 2 is a combustion ring 3 having an opening 3' at the top.
, a bottom plate 4 is arranged at the lower part, and a cylindrical combustion cylinder 6 is arranged upright in the center part, and an upper combustion chamber 6. An upper combustion chamber 7 is formed. The combustion tube 5 has a cylindrical shape with a ceiling, and has a plurality of combustion holes 8 and 8' bored in the peripheral wall for ejecting swirling air flows A and B, and also corresponds to the ventilation holes 9 in the lower opening bottom plate 4. are doing. Note that the air holes 8 and 8' of the combustion tube 6 are similar to the air holes 8 in the upper part.
01o is a cylindrical auxiliary combustion tube located outside the combustion tube 5, in which the air holes 81 at the bottom are roughly bored. A plurality of circulation holes 11 are bored. Further, one side of the auxiliary combustion tube 1o has an opening 13 through which the fuel particulate group 12 passes, and on the side of the opening 13, which is on the leeward side of the air flows A and B, there is a flame stabilizing part 13 whose side part is bent inward. ' is a provision. A spray nozzle 14 communicates with a fuel tank (not shown) via a fuel supply pipe 15 and a fuel pump 16. Reference numeral 17 denotes an ignition electrode insulator, and the ignition electrode 18 is connected to a high voltage transformer (not shown) via an electric wire 19. 2o is a holder for the spray nozzle 14 and the ignition electrode insulator 1, which has an air hole 21 for cooling the spray nozzle 14 through which part of the air from the ventilation fan 23 enters, and is a holder for the water heater can 1 and the ventilation case 22. It is fixed so as to pass through the side and face the inside of the lower combustion chamber 7. 23 is a blower fan,
24 is its motor, and 25 is a wind duct.

The positional relationship between the spray nozzle 14 and the ignition electrode 187 is such that the ignition electrode 18 is on the upwind side of the swirling air flows A and B ejected from the air holes 8 and 8' of the combustion tube 5, with respect to the spray nozzle 14. Further, it is arranged to be slightly separated from the fuel particulate group 12.

In the above configuration, the blower fan 23 is driven and a high voltage is applied to the ignition electrode 18. Next, the fuel pump 16
drive. As a result, the combustion air is first injected into the upper and lower combustion chambers 6, 7 through the air holes 8, 8' of the carburetor 5 as a swirling air flow A1°B, and a high voltage is applied between the ignition electrodes 18. Sparks are generated, and the sparks receive the swirling airflow (particularly B), ride the swirling flow, and flow toward the center of the tip of the spray nozzle 14. At this time, when the fuel pressurized by the fuel pump 16 is injected as a fuel particulate group 12 from the spray nozzle 14 which is set to have a constant injection angle and spray distribution, the sparks are ejected in the central axis direction of the fuel particulate group 12. , the fuel particles 12 are instantly ignited,
Forms a combustion flame. At this time, a part of the combustion flame forms a small flame at one end of the flame holding part 13 when passing through the opening 13 of the auxiliary combustion tube 1o. Next, it is sucked into the circular air flows A and B of the plurality of air holes 8 and 8' of the combustion tube 5, and is drawn into the upper and lower combustion chambers 6.7 with the combustion tube 5 as an axis.
It forms a clean blue flame between the two and burns completely. On the other hand, when extinguishing a fire, the power to the fuel pump 16 is cut off and the fire is extinguished instantly. Here, especially regarding ignition which corresponds to the start of combustion, since the ignition electrode 18 is disposed on the windward side of the swirling air flows A and H from the spray nozzle 14, the ignition electrode 18
The spark C generated between the swirling airflows A and B (especially B
) and rush toward the center axis of the fuel particulate group 12, which greatly improves ignition performance, and at the same time, a part of the combustion flame ignited here, at one end, reaches one side of the opening 13 of the auxiliary combustion tube 10. part, that is, the flame stabilizing part 1 provided on the leeward side of the swirling air flows A and B.
A small flame is formed at 3'.

Therefore, the problems of conventional liquid fuel combustion devices are solved.

That is, when the combustion device is in a cold state, the combustion tube 6 is also cold, so a strong swirling air flow A occurs.

The main combustion flame E was instantaneously formed at the 8th part of the air hole where B was ejected, causing unstable pulsating combustion and a lift phenomenon.

During the so-called transition period (approximately 60 seconds) until the temperature inside the combustion tube 6, the auxiliary combustion tube 1o, and the upper and lower combustion chambers 6.7 reaches a high temperature, a large amount of the harmful gas and soot are generated, and the pulsating combustion However, a pulsating combustion sound was occurring due to the
In this example, by forming a small flame at the flame holding part of 1°3', the above phenomenon was almost completely eliminated. In addition to this, the combustion flame when ignited once reliably forms a small flame p in the flame-holding part 13' and ignites in the combustion tube 6. , ignition at 0'C, voltage drop, internal pressure change in the combustion chamber due to chimney conditions, and re-ignition conditions where adverse conditions overlap, etc.), ensuring reliable ignition and control, with no ignition errors or misfires. As a result, there was no explosion or abnormal combustion, and a safe combustion device could be provided. Furthermore, since a small flame is formed in the flame holding part 13' during the transition period during ignition, less soot adheres to the air holes 8, 8' of the combustion tube 6, and the air holes 8, 8' are prevented from being clogged with soot. As this eliminates the oxidation, stable combustion characteristics can be maintained for a long period of time. In addition, cleaning is not required, making it easy to use.

As described above, according to the present invention, the ignition electrode is moved upwind of the swirling airflow from the injection nozzle, and the ignition electrode is placed above the opening of the auxiliary combustion tube.
Since the flame stabilization section is provided on the leeward side of the swirling air flow, the fuel particles injected from the spray nozzle can be reliably ignited by the sparks generated from the ignition electrode, and a part of the combustion flame caused by this ignition can be reliably ignited. In order to form a small flame in the flame-holding part and let it flow smoothly to the air hole side of the combustion tube,
Even under all adverse conditions, there is no ignition error, there is no misfire or pulsating combustion from the initial stage of combustion to stable combustion, and there is no soot attached to the peripheral wall of the combustion cylinder, so it can last for a long time. It can maintain stable combustibility for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a liquid fuel combustion apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA' in FIG. 5... Combustion tube, 6, 7... Upper, lower twisting chamber, a, a'1... Air hole, 10... Supporting combustion tube, 12 ...Fuel particulate group, 13...
・Opening, 13'... ■l Flame holding part, 14... Spray nozzle, 18... Ignition electrode, A, B...
...Swirling airflow 0 Name of agent: Satoshi Nakao, patent attorney
Male and 1 other person A1 Figure 12 Shio D

Claims (1)

[Scope of Claims] A combustion tube is provided in the combustion chamber, the peripheral wall of which has a plurality of air holes for injecting a swirling air flow, and an auxiliary combustion tube is provided on the outer periphery of the combustion tube, and an opening of the auxiliary combustion tube is provided. A spray nozzle and an ignition electrode are provided between the combustion tube and the auxiliary combustion part, and the ignition electrode is provided on the windward side of the swirling air flow from the spray nozzle, and the swirling air is connected to the opening of the auxiliary combustion tube. A liquid fuel combustion device that has a flame holding section on the leeward side of the flow.