JP3013761B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for vaporizing and burning liquid fuel.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, when a carburetor 21 is heated to a predetermined temperature by a heater 22, a solenoid (33) is actuated and an associated needle (not shown) is used as shown in FIG. At the same time as opening the hole 30, the pump 41 operates to supply the liquid fuel from the fuel tank 40 to the vaporization chamber 24. The supplied liquid fuel is vaporized in the heated vaporization chamber 24 to become vaporized gas, and the vaporized gas passage 32
And jets out into the mixing pipe 33 above the hole of the nozzle 30. The ejected vaporized gas flows into the mixing pipe 33 while inviting the primary air for combustion from the outside by the ejector effect, and is mixed with the air to form an air-fuel mixture to form the air-fuel mixture 2 of the burner head 25.
The fuel is ignited by the jet igniter 28 from 6 and 27 to start combustion.

[0003] When the combustion is started, the fan 36 is activated to supply air into the main body 35, mix with the high-temperature combustion exhaust gas completely burned in the combustion tube 38, and generate hot air from the outlet 37. It is discharged and provided for heating. Also the main body 35
A part of the air supplied to the inside is guided to the inlet of the mixing pipe 23 and flows into the mixing pipe 23 as a part of the primary air for combustion.

At the time of extinguishing the fire, the pump 35 is stopped and the solenoid 33 is actuated so that the interlocking needle closes the hole of the nozzle 30 and immediately stops the supply of vaporized gas to the burner head 25 to extinguish the fire. Room 24
The vaporized gas remaining in the vaporized gas passage 32 is returned to the fuel tank 40 via the return pipe 43.

[0005]

However, in the above-mentioned conventional structure, the flame port 2 of the burner head 25 is ignited at the time of ignition.
It is difficult to ignite immediately because the mixture is diffused and becomes lean at the time of reaching the igniter at the tip of the igniter 28 in order to jet the air-fuel mixture from 6, 27 to the open space in the combustion chamber 34, After a short period of time, the vicinity of the ignition section is ignited after the concentration of the mixture is sufficiently present. Therefore, the air-fuel mixture ejected from the start of the air-fuel mixture ejection to the ignition is diffused, causing odor.

[0006] Further, since the air-fuel mixture is ejected and diffused from each of the flame ports from the time when the flame port near the ignition portion is ignited to the time when all the flame ports provided on the entire periphery of the burner head 26 are ignited, the odor is also increased. This causes a problem of causing discomfort to the user.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to suppress the generation of odor at the time of ignition by accelerating ignition and suppressing the diffusion of unburned air-fuel mixture.

[0008]

According to the present invention, there is provided a vaporizer for vaporizing a liquid fuel, a heater for heating the vaporizer, and a bar having a plurality of flame holes. A burner portion, an igniter for igniting fuel gas ejected from a flame hole of the burner portion, a burner receiving seat on which the burner portion is mounted and integrally formed with a vaporizing portion, And a heat receiving wall on the outer periphery of a corner receiving seat, wherein a height of the heat receiving wall in the vicinity of the igniter is higher than a heat receiving wall of another portion.

The height of the heat receiving wall in the vicinity of the igniter is made higher than that of the other portion, and higher than the position of the flame hole provided in the burner portion.

[0010] Furthermore, a bottomed cylindrical combustion ring is provided on the outer peripheral side of the burner receiving seat, and the upper end of the combustion ring is bent inward.

Further, the position of the bent portion provided with the end of the combustion ring is made higher than the position of the uppermost flame hole formed in the burner portion.

[0012]

According to the present invention, according to the above-described structure, a discharge is caused between the igniter and the heat receiving wall at the time of ignition to ignite the air-fuel mixture ejected from the flame hole of the burner portion, but the height of the heat receiving wall of the ignition portion is reduced. Because of the high air-fuel mixture, the air-fuel mixture ejected from the flame hole of the ignition part collides with the heat receiving wall, causing the air-fuel mixture to stagnate there. Therefore, the diffusion of the air-fuel mixture in the ignition section is suppressed, and the mixture is maintained within the flammable range, so that the ignition can be performed smoothly and quickly. When the air-fuel mixture is ignited, the combustion gas in the igniter rapidly expands in volume, but the combustion gas diffuses upward due to the presence of the heat receiving wall, and also diffuses in the circumferential direction of the burner, and the flame hole adjacent to the igniter Promotes further ignition. Therefore, it is possible to reduce the amount of unburned air-fuel mixture generated during the period, since the time required to ignite after the air-fuel mixture is blown out from the flame hole and the ignition time for each flame hole can be reduced. it can.

Next, by bending the upper end of the combustion ring inward, the unburned air-fuel mixture generated during the period from the time when the air-fuel mixture is ejected through the flame hole to the time of ignition is increased by the resistance of the bent portion of the combustion ring. By suppressing the diffusion into the fuel, the flame after igniting the igniting portion is spouted from each flame hole to promote the ignition of the air-fuel mixture whose diffusion is suppressed by the combustion ring. Therefore, the amount of the air-fuel mixture flowing out without being burned is greatly reduced, so that the odor can be significantly reduced.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a vaporizer, 2 denotes a heater for heating the vaporizer 1, and 3 denotes a vaporizing element incorporated in the vaporizer 1 for promoting vaporization of fuel, which is formed of a wire mesh, porous ceramic, or the like. Is done. Reference numeral 4 denotes a nozzle for ejecting the vaporized gas vaporized by the vaporizing element 3, which has an ejection hole at the tip. 5 is a vaporizer 1
And a circular burner receiving seat 6 on which the burner portion 14 is mounted on the upper surface. Reference numeral 6 denotes a heat receiving wall provided on the burner receiving seat 5 for recovering combustion heat.

Reference numeral 7 denotes a fuel tank, 8 denotes a fuel pump for supplying fuel to the carburetor 1 through an oil feed pipe 9, and 10 denotes a needle 1
A solenoid for driving 1, a needle 11 for opening and closing the hole of the nozzle 4, and a return pipe 12. Numeral 13 denotes a mixing tube which is provided upright in a burner section 14. 14 is a large number of flame holes 15
a, a burner portion provided with 15b, 16 is a burner portion 14
A combustion ring provided so as to cover the outer periphery of the heat receiving wall 6 of the vaporizer 1; an igniter 17 for igniting an air-fuel mixture ejected from the flame hole 15; and 18 a temperature detector for detecting the temperature of the vaporizer 1. It is a temperature detector.

In the above configuration, the heater 2 is energized at the time of ignition to heat the vaporizer 1. When the temperature detector 18 provided in the vaporizer 1 reaches a predetermined temperature, the igniter 17 is energized and starts discharging between the igniter 17 and the heat receiving wall 6a. After a certain period of time, the fuel pump 8 starts to drive, and supplies the fuel stored in the fuel tank 7 to the vaporizing element 3 incorporated in the vaporizer 1 via the oil feed pipe 9. The fuel is heated and vaporized in the heated vaporization element 3 to become a vaporized gas. Further, the solenoid 10 is operated, the needle 11 descends, the ejection hole provided at the tip of the nozzle 4 is opened, and the vaporized gas is ejected. The vaporized gas ejected from the ejection hole of the nozzle 4 is supplied to the mixing pipe 1
At the lower part of 3, primary air is drawn from an open port (not shown) of the vaporizer 1 by an ejector effect, and mixed with the vaporized gas and the drawn air inside to form a mixture. The air-fuel mixture blows out from the flame holes 15a and 15b provided in the burner section 14. The air-fuel mixture ejected from the flame hole 15b near the tip of the igniter 17 is
Is ignited by the energy of the discharge generated at the tip of the nozzle, and the ignited flame sequentially ignites the air-fuel mixture ejected from other flame holes and starts burning. When the combustion starts, the heat receiving wall 6 becomes the flame hole 15.
Heated by the combustion flame formed in a and 15b, heating by the heater 2 for heating the vaporizer 1 by the heat becomes unnecessary, and thereafter, the fuel is vaporized by its own combustion heat to continue the combustion.

At the time of ignition, the solenoid 10 is operated, the ejection hole of the nozzle 4 is opened, and the air-fuel mixture starts to be ejected from the flame holes 15a and 15b. However, if the vicinity of the flame hole 15b of the ignition part is open space. Since the jetted air-fuel mixture diffuses into the open space and becomes lean, ignition becomes difficult. Then, the air-fuel mixture from the time when the air-fuel mixture is jetted to the time when the air-fuel mixture is ignited by the igniter 17 rises without being burned, thereby causing odor. Similarly, the air-fuel mixture is discharged without being burned from the time when the flame 15b of the ignition part is ignited to the time when other flames are ignited. Therefore, it is necessary to reduce the odor from the time when the air-fuel mixture is ejected to the time when the flame is ignited, and the time between the time when the flame of the ignition part is ignited and the time when the other flame is ignited.

According to the structure of the present invention, the height of the heat receiving wall 6a near the igniter 17 is higher than the heat receiving wall 6 of the other portion, so that the mixed gas ejected from the flame hole 15b of the ignition portion is It collides with the heat receiving wall 6a, decelerates, and stagnates. Therefore, the diffusion is suppressed and the mixture is not diluted, so that the combustible mixture ratio is maintained and the ignition can be easily performed. Immediately after ignition, the flame may rise from the flame hole 15b and misfire due to the low temperature near the flame hole 15b. However, in the configuration of the present invention, the flame is held by the heat receiving wall 6a and thus is stable immediately after ignition. Flame can be formed. At the time of ignition, the temperature rises rapidly in the vicinity of the ignition portion, and the combustion gas expands in volume. However, the expansion in the outward direction is suppressed by the heat receiving wall 6a, and the flame expands upward and in the circumferential direction of the burner portion 14. It diffuses from the flame hole 15b of the ignition part to the nearby flame holes 15a and 15b and promotes ignition of the air-fuel mixture ejected from those flame holes.
Increasing the height of the heat receiving wall 6 over the entire circumference can be more effective in promoting ignition and ignition of an adjacent flame hole, but the influence on the combustion performance due to the cooling of the flame during normal combustion and vaporization In order to maintain the heat resistance of the material of the vessel, it is preferable that the height of the heat receiving wall 6a is higher only in the vicinity of the igniter 17 than in other parts.

When the height of the heat receiving wall 6a is higher than that of the flame hole 15b immediately below the flame hole provided in the burner portion 14, the effect of increasing the degree of stagnation is greater and the ignitability is improved.

When the height of the heat receiving wall 6a is increased, the temperature of the tip becomes higher. Therefore, the vicinity of the tip is made of a separate component from the carburetor 1, and if it is made of a material having higher heat resistance than the carburetor 1, reliability is improved. Can be enhanced.

Next, as shown in FIG. 2, by providing a bent portion 16a inside the upper end of the combustion ring 16, the unburned air-fuel mixture rising along the inner wall of the combustion ring 16 by the rising air flow at the time of ignition is bent. With the resistance of 16a, the rise can be suppressed and the current can be deflected inward to promote ignition. That is, the flame holes 15a, 15b
The air-fuel mixture ejected from the ascending air flow rises along the inner surface of the combustion ring 16 due to the ejection speed and the ascending airflow generated by the heat of the heated carburetor 1. When the flame 15b near the igniter 17 is ignited, the temperature rises rapidly in the same part and the expanded combustion exhaust gas (flame) is restrained from expanding upward by the bent portion 16a, and expands in the combustion ring 16 in the circumferential direction. The flame propagates sequentially to adjacent flame holes. On the other hand, the air-fuel mixture ejected from the flame hole at a position distant from the igniter rises in an unburned state until the flame propagates and ignites. It is possible to ignite with a smaller amount of leakage upward due to the flame that is propagated more sequentially. Therefore, the amount of unburned mixed gas discharged to the outside of the combustion device is small, so that the odor can be significantly reduced. The height of the bent portion is the flame hole 1 provided in the burner portion 14.
The arrangement above the uppermost flame holes of 5a and 15b has a greater effect of suppressing the rise of the air-fuel mixture ejected from all flame holes.

[0022]

As described above, the combustion apparatus according to the present invention has a structure in which the height of the heat receiving wall of the ignition portion is higher than that of the other portions, and a structure in which a bent portion is provided inward at the upper end of the combustion ring. As a result, ignition of the mixed gas can be promoted, and flame propagation to other flame holes can be promoted to suppress outflow of the unburned air-fuel mixture, thereby greatly reducing odor at the time of ignition.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a main part of a combustion apparatus according to another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporizer 2 Heater 3 Vaporization element 4 Nozzle 5 Burner receiving seat 6, 6a Heat receiving wall 14 Burner part 15a, 15b Flame hole 16 Burning ring 16a Bent part 17 Ignition device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-109214 (JP, A) JP-A-4-278107 (JP, A) JP-A-4-353303 (JP, A) JP-A-5-205 1803 (JP, A) JP-A-4-313605 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 11/02 F23D 11/40 F23D 11/44

Claims (5)

(57) [Claims] 1. A vaporizing section for vaporizing a liquid fuel, a heater for heating the vaporizing section, a burner section provided with a plurality of flame holes, and jetted from the flame holes of the burner section. An igniter for igniting a fuel gas, a burner receiving seat on which the burner portion is mounted and integrally formed with a vaporizing portion, and a heat receiving wall on an outer periphery of the burner receiving seat; A combustion device in which the height of the heat receiving wall near the igniter is higher than the heat receiving wall of the other part. 2. The combustion apparatus according to claim 1, wherein the height of the heat receiving wall near the igniter is higher than the position of the lowermost flame hole formed in the burner. 3. The combustion device according to claim 1, wherein the heat receiving wall in the vicinity of the igniter is formed as a separate component from the vaporizer. 4. A vaporizer for vaporizing a liquid fuel, a heater for heating the vaporizer, a burner having a plurality of flame holes, and a fuel gas ejected from the burner. An igniter for igniting, a burner receiving seat on which the burner portion is mounted and integrally formed with a vaporizing portion, a heat receiving wall on an outer periphery of the burner receiving seat, and the burner receiving seat; A combustion device comprising: a bottomed cylindrical combustion ring provided on the outer peripheral side of the combustion ring; 5. The combustion apparatus according to claim 4, wherein the position of the bent portion at the upper end of the combustion ring is higher than the position of the uppermost flame hole formed in the burner portion.