JP3049970B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a liquid fuel as a fuel,
The present invention relates to a combustion device used for a water heater or a heater.

[0002]

2. Description of the Related Art Conventionally, this type of combustion apparatus has a configuration as shown in FIG. As shown in the figure, the vaporizer 4 embedded in the heater 6 has an oil supply pump 7 connected to one of the vaporizers 4 and a jet nozzle portion 5 formed to the other. Burner 1
At its lower end, a suction port 2 is provided, the jet nozzle section 5 is exposed, and at its upper end, there is a flame port section 3 to form a flame 9. 8 is a fuel tank.

The operation of the above configuration will be described. When the heater 6 is energized and the carburetor 4 reaches a predetermined temperature, the refueling pump 7 operates to supply the fuel in the fuel tank 8 into the carburetor 4. The supplied fuel comes into contact with the heated inner wall of the vaporizer 4, is vaporized, and is supplied as a vaporized gas from the ejection nozzle portion 5 to the inside of the burner through the ejection inlet 2. At this time, air is simultaneously discharged from the suction port 2 together with the vaporized gas due to the ejector effect of the vaporized gas ejected from the ejection nozzle portion 5.
Supplied within. The vaporized gas is mixed with air in the burner 1, is ejected from the flame port 3, is ignited by an igniter (not shown), and burns.

[0004]

However, in the above-mentioned conventional structure, the fuel is vaporized by touching the inner wall of the heated carburetor 4, so that if the fuel is used for a long time or a deteriorated fuel or the like is used, the vaporization surface will be reduced. However, there is a problem that tar is generated and poor vaporization occurs. Further, since the vaporizer 4 and the burner 1 are thermally insulated from each other by the space, all the heat for vaporizing the fuel needs to be supplied by the heater 6 even during the combustion, and the power consumption during operation of the combustion device is large. There was a problem.

An object of the present invention is to solve the above-mentioned conventional problems and to prevent poor vaporization due to the generation of tar on the vaporized surface and to reduce the power consumption of a heater for vaporizing fuel.

[0006]

According to the present invention, there is provided a vaporizing chamber for vaporizing fuel, a burner communicating with the vaporizing chamber, and a fuel nozzle having a front end facing the vaporizing chamber. A fuel pump for supplying fuel to the fuel nozzle,
An air heating chamber for heating air flowing into the vaporization chamber with an electric heater, a heat exchanger communicating with the vaporization chamber while heating the air with the combustion heat of the burner, and a blower for supplying air to the heat exchanger and the air heating chamber; And a bypass passage for hot air is provided between the inlet and the outlet of the vaporization chamber, so that the amount of hot air bypassed varies depending on the amount of combustion.

[0007]

In the above configuration, at the start of combustion, the air supplied from the blower is heated by the electric heater in the air heating chamber, and is supplied as hot air to the vaporizing chamber. On the other hand, the fuel is supplied to the fuel nozzle by the fuel pump and sprays into the vaporization chamber in a mist form from the tip of the fuel nozzle facing the vaporization chamber, diffuses into the warm air, and is vaporized by the heat. The vaporized gas mixes with the warm air and starts burning at the burner port of the burner. During combustion, the air supplied from the blower is heated by the combustion heat when passing through a heat exchanger provided above the burner, is supplied as warm air to the vaporization chamber, and vaporizes the fuel. Therefore, during combustion, electric power can be reduced because a heat source for heating the air to generate hot air is almost entirely supplied by combustion heat. Further, the fuel is diffused into the warm air and vaporized in the process of vaporizing the fuel in the vaporization chamber, so that tar is not generated on the inner wall surface of the vaporization chamber.

When the amount of combustion is large due to the bypass passage and the regulating valve provided between the inlet and the outlet of the vaporizing chamber, the amount of hot air to be bypassed is increased, and the amount of warm air supplied to the vaporizing chamber is reduced to achieve stable vaporization. State can be realized.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, reference numeral 11 denotes a cylindrical vaporizing chamber, and an air chamber 12 is provided so as to surround the outer periphery. The vaporizing chamber 11 and the air chamber 12 are communicated with each other through an air port 13. The air port 13 forms a cut-and-raised piece 13 a so that the supplied warm air turns inside the vaporization chamber 11. Reference numeral 14 denotes an air heating chamber for heating the air, in which an electric heater 15 is incorporated, and which is communicated with the air chamber 12 by an air conduit 16. 1
Reference numeral 7 denotes a heat exchanger having fins on its outer surface and arranged above the burner 23. The heat exchanger 7 communicates with the blower 18 on the upstream side and communicates with the air heating chamber 14 via the air conduit 16 on the downstream side. . Reference numeral 18 denotes a blower for supplying combustion air. Reference numeral 19 denotes a hot air bypass passage 2 provided between the air chamber 12 serving as a hot air inlet of the vaporizing chamber 11 and the supply pipe 24 serving as an outlet of the mixed gas.
Numeral 0 denotes an adjusting valve provided in the bypass passage 19, which adjusts the amount of hot air to be bypassed to be large when the amount of combustion is large and to be decreased when the amount of combustion is small. 2
Reference numeral 1 denotes a fuel nozzle having an injection port facing the vaporization chamber 11, 22 denotes a fuel pump for supplying fuel from the fuel nozzle 21,
Numeral 3 denotes fuel tanks which are connected to each other by a fuel supply pipe. Reference numeral 25 denotes a burner, which communicates with the vaporization chamber 11 through a supply pipe 24, and has a flame port 26 formed of a number of small holes on the upper surface. Numeral 28 denotes a temperature detector, which comprises an air chamber 12 and an air heating chamber 14.
Are provided in an air conduit 16 for connecting.

The operation of the above configuration will be described. That is, when the blower 8 is operated and the electric heater 15 is energized, the air passing through the heat exchanger 17 and the air heating chamber 14 is heated to become hot air, and the air is supplied to the vaporizing chamber 11 through the air chamber 12.
And a part of the burner directly through the bypass passage 19.
Supplied to When the hot air temperature reaches a predetermined temperature, the temperature is detected by a temperature detector 28 provided in the air conduit 16 and the fuel pump 22 operates. The fuel in the fuel tank 23 is sprayed into the vaporization chamber 11 from the ejection port of the fuel nozzle 21 by the fuel pump 22 in the form of a mist. On the other hand, the warm air is supplied from the air chamber 12 into the vaporization chamber 11, and the air port 13 serving as a passage has the cut-and-raised pieces 13 a.
Produces a swirling flow along the inner wall of The atomized fuel ejected from the fuel nozzle 21 is heated by the swirling flow of the hot air, becomes a vaporized gas, mixes with the hot air, and mixes with the hot air supplied through the bypass passage 19 in the supply pipe 24. Burner 25
And is ignited by a spout igniter (not shown) from a flame port provided above the burner 25 to start combustion. When the combustion is started, the air supplied from the blower 18 is heated by the heat of combustion in the heat exchanger 17 provided above the bate 25 to become hot air and supplied to the vaporization chamber 11 via the air heating chamber 14. You. At this time, when the temperature of the hot air supplied to the vaporizing chamber 11 becomes equal to or higher than a certain temperature, the power supplied to the heater 15 detected by the temperature detector 28 is reduced and the temperature of the hot air is controlled to be constant. You. If the amount of the hot air is excessive when the fuel sprayed in the vaporization chamber 11 is vaporized by the hot air, the speed of the hot air increases, and the amount of heat exchange with the fuel becomes insufficient. 25, it becomes difficult to perform normal combustion. If the amount of hot air is insufficient, incomplete combustion occurs due to insufficient air during combustion. In the present invention, the amount of hot air bypassed from the inlet to the outlet of the vaporizing chamber 11 through the bypass passage 19 is controlled by the regulating valve 2.
In order to adjust the gas flow to be large when the combustion amount is large and to be small when the combustion amount is small, the vaporization chamber 1 is set to 0.
It is possible to supply a necessary amount of air at the time of combustion without sending excessive warm air to the fuel cell 1, and stable vaporization and combustion can be realized. Further, by providing an orifice or the like in the same part instead of the regulating valve 20, the bypass passage 19 is provided.
If the amount of warm air flowing through the bypass passage 19 is set to the optimum amount at the time of the maximum combustion amount, the ratio of the amount of warm air flowing through the bypass passage 19 to the amount of warm air supplied to the carburetor 11 in other combustion amount regions does not change. Effects can be obtained.

The atomized fuel ejected from the fuel nozzle 21 in the vaporization chamber 11 diffuses into a swirling flow of warm air flowing along the inner surface of the vaporization chamber 11 and is vaporized by the heat until reaching the inner wall surface. Complete. Therefore, there is no generation of tar on the surface of the solid as in the conventional case where vaporization is performed on the surface of the solid.

The warm air supplied in the process of starting the blower 18 and the electric heater 15 and igniting is discharged from the flame hole 26 of the burner 25 through the vaporization chamber 11. Heat. Therefore, when the hot air reaches the predetermined temperature and ejects fuel from the fuel nozzle 21 and the mixed gas of the vaporized gas and the hot air is supplied into the burner 25, the mixed gas is not cooled and reliquefied. . Further, since the burner 25 is heated, the ignition is promoted when igniting at the flame hole portion 26, and the generation of unburned gas due to the ignition delay is small, and the odor can be reduced.

[0013]

As described above, according to the combustion apparatus of the present invention, the following effects can be obtained. (1) By providing a heat exchanger heated by the combustion heat of the burner and using combustion heat as a heat source of hot air for vaporizing fuel, power consumption during combustion can be reduced. (2) Since the fuel is diffused in the hot air and vaporized, tar generation on the vaporized surface can be prevented. (3) By heating the burner with warm air at the start of combustion, ignition is promoted and ignition odor can be reduced. (4) By providing a hot air bypass passage between the inlet and the outlet of the vaporization chamber, stable vaporization and combustion can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a detailed cross-sectional view of a vaporization chamber of the combustion device.

FIG. 3 is a detailed vertical sectional view of the vaporization chamber.

FIG. 4 is a sectional view of a main part of a conventional combustion device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 vaporization chamber 12 air chamber 13 air hole 14 air heating chamber 15 electric heater 16 air conduit 17 heat exchanger 18 blower 19 bypass passage 20 regulating valve 21 fuel nozzle 22 fuel pump 25 burner

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23D 11/02 F23D 11/10 F23D 11/40 F23D 11/44

Claims (3)

(57) [Claims] 1. A vaporizing chamber for vaporizing fuel, a burner communicating with the vaporizing chamber, a fuel nozzle having a front end facing the vaporizing chamber, a fuel pump for supplying fuel to the fuel nozzle,
An air heating chamber for heating air flowing into the vaporization chamber by an electric heater, a heat exchanger for heating air by the combustion heat of the burner and communicating with the vaporization chamber, and supplying air to the heat exchanger and the air heating chamber A liquid fuel combustion device, comprising: a blower that performs heating; and a bypass passage for warm air provided between an inlet and an outlet of the vaporization chamber. 2. An air chamber provided so as to surround a cylindrical vaporizing chamber, and a plurality of cut-and-raised pieces so that hot air supplied between the air chamber and the vaporizing chamber turns in the vaporizing chamber. The liquid fuel combustion device according to claim 1, further comprising an air hole having: 3. A control valve according to claim 1, wherein an adjusting valve is provided in the bypass passage.
The liquid fuel combustion device according to claim 1.