JPH0875120A - Liquid fuel combustion apparatus - Google Patents

Abstract

PURPOSE: To keep a good combustion state even when a bad quality fuel is used over a long time. CONSTITUTION: There are provided a vaporizer 20 for heating and vaporizing a liquid fuel jetted from a nozzle 19, a fan 22 for supplying combustion air, a fan air passage 23 provided parallely with the fan, a mixing chamber 27 provided parallely with the downstream side of the vaporizer 20, a plurality of burner heads 31 disposed alternately longitudinally and formed on the downstream side of the mixing chamber 27, and a combustion chamber formed upwardly of the burner heads 31. Further, there are provided a heat reception part 33 where part of the vaporizer 20 is protruded into the combustion chamber, a guide plate 35 located on the lower surface of each burner head 31 for guiding the mixed gas to the side of the heat reception part 33, and deflection means 36 located downstream the vaporizer 20 for leading the mixed gas to the center of the burner heads.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus used as a heat source for hot water supply / heating equipment.

[0002]

2. Description of the Related Art A conventional combustion device has a structure shown in FIG. That is, in FIG. 4, reference numeral 1 is a burner head in which a plurality of flame openings 2 are arranged in parallel in the longitudinal direction, and a burner head case 3 having a U-shape and a heater 4 having an opening surface having a U-shape. It is closed by the vaporizer 5 that it has. Reference numeral 6 denotes a combustion chamber which is formed above the burner head 1 and internally provided with a heat receiving portion 7 in which a part of the vaporizer 5 is projected in order to obtain heat received by a combustion flame. Reference numeral 8 denotes blast air for supplying combustion air, and a blast passage 9 is continuously provided. Reference numeral 10 denotes a vaporizer lid which is attached to the vaporizer 5 and seals vaporized gas. The vaporizer lid 10 has an opening above the vaporizer lid 10.
A nozzle 11 for ejecting fuel to the vaporizer 5 is provided so as to face the vaporizer 5. Reference numeral 12 denotes an electromagnetic pump for supplying fuel, which supplies fuel to the nozzle 11 through the oil supply pipe 13 and injects it onto the surface of the carburetor 5 to vaporize it. Reference numeral 14 is a mixing chamber which serves as a passage for mixing the fuel vaporized by the vaporizer 5 and the combustion air fed from the blower 8 and supplying the mixture to the burner head 1. Reference numeral 15 is a uniform plate attached to the lower surface of the burner head 1 for uniformizing the flow of the air-fuel mixture sent to the mixing chamber 14. Reference numeral 16 is a burner case provided so as to cover the outside of the burner head case 3 and the mixing chamber 14.

In this conventional liquid fuel combustion apparatus, the fuel is injected from the nozzle 11 supplied with the fuel from the electromagnetic pump 12 to the vaporizing surface of the vaporizer 5 to generate vaporized gas, which is then blown from the blower 8 into the vaporizer 5. The sent air was mixed in the mixing chamber 14 to form a mixture, which was made uniform by the uniform plate 15 and burned by the burner head 1.

[0004]

However, in the above-mentioned conventional configuration, the carburetor 4 is used when used with general clean fuel.
Evaporation is efficiently carried out on the surface, and uniform combustion can be realized, but if deteriorated fuel (for example, one exposed to sunlight or air for a long time) or fuel mixed with a high boiling point component is used for a long time, it causes combustion failure Sometimes occurred. That is, when the fuel as described above is used, the tar-like substance is likely to be deposited on the vaporization surface, the vaporization state deteriorates, and the vaporization is delayed, so that the vaporized gas in the central portion of the vaporizer decreases and both ends are Will increase. Therefore, the flame formed on the burner head 1 also
A plurality of flame ports 2 arranged in parallel tend to be small in the central portion in the vicinity of the carburetor 5 and large in both ends. In more extreme cases, the flame near the center becomes even smaller, and the heat receiving part 7
There is a risk that the amount of heat received near the center of the vaporizer will decrease and the temperature of the vaporizing surface cannot be maintained, vaporization near the center of the vaporizer 5 will not be possible, and the unvaporizable fuel will drip into the mixing chamber 14. was there.

The present invention solves the above problems and provides a liquid fuel combustion apparatus capable of maintaining normal combustion even when the deteriorated vaporization state is deteriorated by using a deteriorated fuel or a fuel mixed with a high boiling point component for a long time. This is the purpose.

Another object of the present invention is to provide a liquid fuel combustion apparatus which is cheaper and can be manufactured by simple processing.

[0007]

In order to achieve the above object, the present invention provides a liquid fuel combustion apparatus with fuel supply means for supplying liquid fuel, and a nozzle for ejecting the supplied liquid fuel.
A vaporizer that heats and vaporizes the liquid fuel ejected from the nozzle, a blower that supplies combustion air, a blower passage that is connected to the blower, and a blower that is in the blower and extends to the inlet of the vaporizer. A primary air passage, a secondary air passage formed outside the primary air passage, a mixing chamber continuously provided on the downstream side of the carburetor, and a plurality of alternately formed longitudinally formed mixing chamber downstream sides. A burner head having primary flame outlets and secondary flame orifices arranged in an array, a combustion chamber formed above the burner head, a heat receiving portion in which a part of the vaporizer is projected into the combustion chamber, and the burner. A guide plate located on the lower surface of the head for introducing a mixture of fuel and combustion air vaporized by the vaporizer to the heat receiving part side, and a flow of the mixture located downstream of the vaporizer to the center of the burner head. It has a deflecting means for guiding.

Further, the deflecting means is formed by straightening vanes extending to the mixing chamber side at both ends of the lower surface of the burner head near the vaporizer.

Further, the current plate is formed integrally with the guide plate by projecting both ends of the guide plate near the carburetor toward the mixing chamber side.

Further, fuel supply means for supplying liquid fuel, a nozzle for ejecting the supplied liquid fuel, a vaporizer for heating and vaporizing the liquid fuel ejected from the nozzle, and a blower for supplying combustion air. A blower passage connected to the blower, a primary air passage in the blower passage extending to an inlet of the carburetor, a secondary air passage formed outside the primary air passage, and a carburetor of the carburetor. A mixing chamber continuously provided on the downstream side, a burner head formed on the downstream side of the mixing chamber and having a plurality of primary flame openings and secondary flame openings alternately arranged in the longitudinal direction, and formed above the burner head. Combustion chamber, a heat receiving part in which a part of the vaporizer is projected into the combustion chamber, and a mixture of fuel vaporized in the vaporizer and combustion air on the lower surface of the burner head, the heat receiving part. Side guide plate and primary sky The flow of the gas mixture In the downstream of the evaporator flow and has a deflecting means for directing toward the center of the burner head.

[0011]

The liquid fuel combustion apparatus of the present invention has the above-mentioned structure.
By deflecting the mixed gas of fuel and air vaporized by the vaporizer to the central portion of the burner head, the flame near the central portion of the burner head near the vaporizer can be strengthened.
Therefore, the amount of heat received can always be secured even near the center of the heat receiving portion, and the vaporization surface temperature near the center of the vaporizer is maintained at a predetermined temperature. Therefore, a good combustion state can be maintained even when a poor quality fuel is used for a long time.

Further, since the deflecting means is formed integrally with the guide plate by projecting both ends of the guide plate in the vicinity of the vaporizer to the mixing chamber side, a separate member is not processed.

Further, since the deflecting means is constructed by shielding both ends of the vaporizer outlet, no special processing is added in the manufacturing process or the like.

[0014]

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

In FIG. 1, kerosene which is a liquid fuel is pumped from a fuel tank (not shown) to a pump 17 which is a fuel supply means.
It is sucked up by and is supplied to the nozzle 19 by the oil feed pipe 18. A vaporizer 20 is set in front of the nozzle 19 and has a heater 21 embedded therein. Reference numeral 22 denotes a blower that supplies combustion air, and a blower path 23 is connected to the blower.

A primary air passage 24 extends to the entrance of the carburetor 20 and is separated from the secondary air passage 25. 26
Is a carburetor lid provided on the front surface of the carburetor 20 and is provided with an opening so that the tip of the primary air passage 24 faces. Reference numeral 27 denotes a mixing chamber, and 28 denotes a plurality of primary flame ports arranged downstream of the mixing chamber 27 in parallel with the longitudinal direction, and a large number of small holes are provided on the upper surface. Reference numeral 29 denotes a burner case that covers the entire combustion section, and the space inside is a secondary air passage 25. Reference numeral 30 denotes a secondary flame outlet having a large number of small holes on the upper surface, and the primary flame outlet 28
A plurality of primary flame outlets 28 are alternately arranged in the longitudinal direction so as to supply air to the vicinity. A burner head 31 is composed of the primary flame opening 28 and the secondary flame opening 30, and the combustion chamber 3 is formed above the burner head 31.
Form 2 Reference numeral 33 is a heat receiving portion formed on the rear surface of the vaporizer 20 so as to project to the combustion chamber 32. 34 is a heat exchanger. Reference numeral 35 is a guide plate provided on the lower surface of the burner head 31 near the vaporizer 20. Reference numeral 36 denotes a rectifying plate which is a deflecting means, and is configured to extend toward the mixing chamber 27 side at both ends of the lower surface of the burner head 31 near the vaporizer 20. This rectifying plate 3
As shown in FIG. 2, 6 may be formed integrally with the guide plate 35 so as to project toward the mixing chamber 27 side at both ends of the guide plate 35 in the vicinity of the vaporizer 20.

In the above structure, when a power source (not shown) is turned on, the heater 21 is energized to heat the vaporizer 20. When the vaporizer 20 reaches a predetermined temperature, the blower 22 operates and the combustion air is supplied. The air supplied to the air passage 23 is divided into primary air supplied into the primary air passage 24 and secondary air supplied into the secondary air passage 25. At the same time, the pump 17 is activated and fuel is supplied to the nozzle 1.
It is sprayed from 9 to the vaporizer 20. Fuel is a high temperature vaporizer 2
Mixing chamber 2 while being vaporized on the 0 wall and being mixed with primary air
It is conveyed to 7, and becomes a combustible mixture and is ejected from the primary flame port 28. At this time, the combustible mixture is ignited by the discharge of an igniter (not shown) to start combustion. Further, since the secondary air passes through the secondary air passage 25 inside the burner case 29 and is supplied to the secondary flame port 30 arranged near the primary flame port 28, it burns in a blue flame in the combustion chamber 32. The high temperature combustion gas generated by the combustion is heat-exchanged by the heat exchanger 37 and discharged. A part of the mixed gas of fuel and air vaporized in the vaporizer 20 is introduced to the vaporizer 20 side by the guide plate 38, and a strong flame is formed on the vaporizer 20 side of the burner head 31, and the heat receiving portion 33 Secure the amount of heat received. Further, the mixed gas flowing near both ends of the vaporizer 20 is deflected toward the center by the flow straightening plates 36 formed at both ends of the guide plate 35, and a strong flame is formed at the center. Therefore, since the amount of heat received in the vicinity of the center of the heat receiving portion 33 is increased, the temperature in the vicinity of the center of the vaporization surface can be sufficiently maintained, and even if the deteriorated fuel or the fuel mixed with the high boiling point component is burned for a long time, it is vaporized. The temperature of the vessel 20 can be maintained to maintain a good combustion state.

FIG. 3 shows another embodiment of the liquid fuel combustion apparatus of the present invention, in which the deflecting means are formed at both ends of the outlet of the carburetor 20 by the shield portions 37 integrally with the carburetor 20. With this configuration, the air-fuel mixture supplied from both ends of the vaporizer 20 is deflected toward the center by the shield portion 37, and the air-fuel mixture near the center is increased. Further, since the carburetor 20 itself can obtain the deflection effect, no special member or processing is required, and the same effect as described above can be obtained at low cost.

[0019]

As described above, since the liquid fuel combustion apparatus of the present invention has the deflecting means downstream of the vaporizer and directs the flow of the air-fuel mixture toward the center of the burner head, it is vaporized by the vaporizer. By deflecting the generated mixed gas of fuel and air toward the central portion of the burner head, the flame near the central portion of the burner head near the vaporizer can be strengthened. Therefore, the amount of heat received can always be secured even near the center of the heat receiving part, so the vaporization surface temperature near the center of the carburetor is maintained at a predetermined temperature, so that a good combustion state should be maintained even when using poor quality fuel. You can

Further, since the rectifying plate as the deflecting means is formed integrally with the guide plate by projecting both ends of the guide plate in the vicinity of the carburetor to the mixing chamber side, there is no need to add a separate member. A combustion device can be realized at low cost by simple processing. Further, since the deflecting means is formed by blocking both ends of the vaporizer outlet, only the vaporizer mold processing is required, and there is no need for processing in the manufacturing process, so that the same effect can be realized at a lower cost. You can

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a liquid fuel combustion device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a deflecting unit of the liquid fuel combustion apparatus.

FIG. 3 is a perspective view of a main part of a liquid fuel combustion apparatus according to another embodiment of the present invention.

FIG. 4 is a sectional view of a conventional liquid fuel combustion device.

[Explanation of symbols]

 17 Fuel Supply Means 19 Nozzle 20 Vaporizer 22 Blower 23 Air Blower 24 Primary Air Passage 25 Secondary Air Passage 27 Mixing Chamber 28 Primary Flame Mouth 30 Secondary Flame Mouth 31 Burner Head 32 Combustion Chamber 33 Heat Receiver 35 Guide Plates 36, 37 Deflection means

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Seiichi Shinoda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A fuel supply means for supplying liquid fuel, a nozzle for ejecting the supplied liquid fuel, a vaporizer for heating and vaporizing the liquid fuel ejected from the nozzle, and a blower for supplying combustion air. A blower passage connected to the blower, a primary air passage in the blower passage extending to an inlet of the carburetor, a secondary air passage formed outside the primary air passage, and a carburetor of the carburetor. A mixing chamber continuously provided on the downstream side, a burner head formed on the downstream side of the mixing chamber and having a plurality of primary flame openings and secondary flame openings alternately arranged in the longitudinal direction, and formed above the burner head. A combustion chamber to be formed, and a heat receiving portion in which a part of the vaporizer is projected into the combustion chamber,
A guide plate on the lower surface of the burner head for introducing a mixture of fuel and combustion air vaporized by the vaporizer to the heat receiving portion side, and a flow of the mixture that is downstream of the vaporizer of the primary air flow. Liquid fuel combustion apparatus having a deflecting means for guiding the exhaust gas toward the center of the burner head. 2. The liquid fuel combustion apparatus according to claim 1, wherein the deflecting means is formed by straightening vanes extending toward the mixing chamber at both ends of the lower surface of the burner head near the vaporizer. 3. The liquid fuel combustion apparatus according to claim 2, wherein the current plate is formed integrally with the guide plate by projecting both ends of the guide plate near the carburetor toward the mixing chamber. 4. A fuel supply means for supplying liquid fuel, a nozzle for ejecting the supplied liquid fuel, a vaporizer for heating and vaporizing the liquid fuel ejected from the nozzle, and a blower for supplying combustion air. A blower passage connected to the blower, a primary air passage in the blower passage extending to an inlet of the carburetor, a secondary air passage formed outside the primary air passage, and a carburetor of the carburetor. A mixing chamber continuously provided on the downstream side, a burner head formed on the downstream side of the mixing chamber and having a plurality of primary flame openings and secondary flame openings alternately arranged in the longitudinal direction, and formed above the burner head. A combustion chamber to be formed, and a heat receiving portion in which a part of the vaporizer is projected into the combustion chamber,
A guide plate on the lower surface of the burner head for introducing a mixture of fuel and combustion air vaporized by the vaporizer to the heat receiving portion side; and a deflection means formed by shielding both ends of the vaporizer outlet. The liquid fuel combustion apparatus according to claim 1, comprising.