JPH0960815A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the lowering of odor at ignition by promoting the ignition of a mixed gas and the propagation of a flame to all flame holes to restrain the outflow of the mixed gas yet to be burned. SOLUTION: A burner receiving seat 5 and a heat receiving wall 6 are formed integral at a carburetion part 1 and the height of a neighboring heat receiving wall 6a corresponding to an igniter 17 is made higher than other parts while a bottomed cylindrical combustion ring 16 is provided having a bent part 16a inward at the tip thereof on the side of the outer circumference of the burner receiving seat 5. This promotes the ignition of a mixed gas and the propagation of a flame to all flame holes to restrain the outflow of the unburned mixed air thereby enabling reduction in odor at the ignition.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, in a combustion apparatus of this type, when a carburetor 21 is heated to a predetermined temperature by a heater 22, a solenoid 33 operates to interlock a needle (not shown) with a nozzle. The hole of 30 is opened, and 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 is jetted into the mixing pipe 33 above the hole of the nozzle 30. The ejected vaporized gas flows into the mixing pipe 33 while attracting the primary air for combustion from the outside by the ejector effect, and is mixed with the air to become an air-fuel mixture, which is the flame port 2 of the burner head 25.
6 and 27 are ignited by a jet igniter 28 to start combustion.

When combustion is started, the fan 36 is activated to supply air into the main body 35 and mix with the high temperature combustion exhaust gas completely burned in the combustion cylinder 38 to form warm air from the blowout port 37. It is discharged and used for heating. Also the main body 35
A part of the air supplied therein 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.

When the fire is extinguished, the pump 35 is stopped, the solenoid 33 is operated, and the interlocking needle closes the hole of the nozzle 30, promptly shuts off the supply of vaporized gas to the burner head 25 and extinguishes 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 outlet 2 of the burner head 25 is ignited at the time of ignition.
Since the air-fuel mixture from 6 and 27 jets into the open space in the combustion chamber 34 and reaches the ignition portion at the tip of the igniter 28, it has already diffused and becomes a lean state, so it is difficult to ignite immediately. Ignition occurs after a certain amount of time has passed and the vicinity of the ignition part is in a state where the concentration of the air-fuel mixture is sufficient. For this reason, the air-fuel mixture ejected from the time when the air-fuel mixture was ejected until the time of ignition was diffused, causing odor generation.

Further, since the air-fuel mixture is jetted and diffused from each flame opening from the time when the flame opening near the ignition part is ignited until all the flame openings provided around the entire circumference of the burner head 26 are ignited, this also causes odor. However, there is a problem that it causes the user to feel uncomfortable.

The present invention is intended to solve the above problems, and it is an object of the present invention to suppress odor generation during ignition by promoting ignition and suppressing diffusion of unburned air-fuel mixture.

[0008]

In order to achieve the above object, the present invention has a vaporizing section for vaporizing liquid fuel, a heater for heating the vaporizing section, and a bar having a large number of flame holes. A burner portion, an igniter for igniting the fuel gas ejected from the flame holes of the burner portion, a burner receiving seat on which the burner portion is mounted and formed integrally with a vaporization portion, and the burner. And a heat receiving wall on the outer periphery of the heat receiving wall, and the height of the heat receiving wall in the vicinity of the igniter is made higher than that of the heat receiving walls of other parts.

Further, the height of the heat receiving wall in the vicinity of the igniter is made higher than the other portions, and is made higher than the positions of the flame holes provided in the burner portion.

Furthermore, a cylindrical combustion ring with a bottom 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 at the tip 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, with the above-described structure, the ignition is performed between the igniter and the heat receiving wall to ignite the mixture gas ejected from the burner flame holes. Due to the high temperature, the air-fuel mixture ejected from the flame holes of the ignition portion collides with the heat receiving wall and causes stagnation of the air-fuel mixture in the same portion. Therefore, the diffusion of the air-fuel mixture in the ignition part is suppressed and the mixture is maintained within the combustible range, so that the ignition can be smoothly and quickly performed. Also, when the air-fuel mixture is ignited, the combustion gas in the ignition part rapidly expands in volume, but due to the presence of the heat receiving wall, the combustion gas diffuses upward and also in the circumferential direction of the burner part, and the flame holes adjacent to the ignition part Further promotes ignition. Therefore, the time from the ejection of the air-fuel mixture from the flame holes to the ignition can be shortened and the ignition time to each flame hole can be shortened, so that the amount of unburned air-fuel mixture generated during that time can be reduced and the odor can be reduced. it can.

Next, by bending the upper end of the combustion ring inward, the unburned air-fuel mixture generated from the ejection of the air-fuel mixture from the flame hole to the ignition is moved upward by the resistance of the bent portion of the combustion ring. Suppressing diffusion into the ignition portion promotes ignition of the air-fuel mixture that has been ignited at the ignition portion and is ejected from each flame hole and diffusion is suppressed by the combustion ring. Therefore, the amount of the air-fuel mixture that flows 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, 1 is a vaporizer, 2 is a heater for heating the vaporizer 1, 3 is a vaporization element incorporated in the vaporizer 1 for promoting vaporization of fuel, and is formed of a wire mesh, a porous ceramic or the like. To be done. Reference numeral 4 denotes a nozzle for ejecting the vaporized gas vaporized by the vaporization element 3, which has an ejection hole at its tip. 5 is a vaporizer 1
A circular burner receiving seat, which is connected to the burner receiving seat 14 and has the burner portion 14 mounted on the upper surface thereof, is a heat receiving wall provided on the burner receiving seat 5 for recovering combustion heat.

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

In the above structure, the heater 2 is energized to heat the carburetor 1 at the time of ignition. When the temperature detector 18 provided in the carburetor 1 reaches a predetermined temperature, the igniter 17 is energized to start discharging between the igniter 17 and the heat receiving wall 6a. After a certain period of time has passed, the fuel pump 8 starts to drive and the fuel stored in the fuel tank 7 is supplied to the vaporization element 3 incorporated in the vaporizer 1 via the oil feed pipe 9. The fuel is heated in the heated vaporization element 3 to be vaporized into vaporized gas. Further, the solenoid 10 is actuated, the needle 11 is lowered, 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 holes of the nozzle 4 is mixed with the mixing pipe 1
In the lower part of 3, the primary air is attracted from the opening (not shown) of the vaporizer 1 by the ejector effect, and the vaporized gas and the attracted air are mixed inside to form a mixture. The air-fuel mixture is ejected from the flame holes 15a and 15b provided in the burner portion 14. The air-fuel mixture ejected from the flame hole 15b near the tip of the igniter 17 is
It is ignited by the energy of the discharge generated at the tip of, and the ignited flame sequentially ignites the air-fuel mixture ejected from other flame holes and starts combustion. When the combustion is started, the heat receiving wall 6 causes the flame holes 15
It is heated by the combustion flames formed on a and 15b, and the heat does not require heating by the heater 2 for heating the carburetor 1, and thereafter, the fuel heats itself to vaporize the fuel and continue the combustion.

At the time of ignition, the solenoid 10 is actuated to open the ejection hole of the nozzle 4 and to start ejection of the air-fuel mixture from the flame holes 15a and 15b. However, when the vicinity of the flame hole 15b of the ignition portion is an open space. Ignition becomes difficult because the jetted mixture diffuses into the open space and becomes lean. Then, the air-fuel mixture from the jet of the air-fuel mixture to the time when the air-fuel mixture is ignited by the igniter 17 rises unburned, which causes an odor. Similarly, the air-fuel mixture is discharged in an unburned state even after the flame hole 15b of the ignition portion is ignited until the other flame holes are ignited. Therefore, it is necessary to shorten the time from the jet of the air-fuel mixture to the ignition and the time from the ignition of the flame hole of the ignition part to the ignition of the other flame hole in order to reduce the odor.

According to the structure of the present invention, since the heat receiving wall 6a near the igniter 17 is higher than the heat receiving wall 6 in the other portions, 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, diffusion is suppressed and the liquid is not diluted, so that the combustible mixture ratio is maintained and ignition can be easily performed. Immediately after ignition, since the temperature near the flame hole 15b is low, the flame may float up from the flame hole 15b and cause misfire. However, in the configuration of the present invention, the flame is held by the heat receiving wall 6a, and thus stable even immediately after ignition. A flame can be formed. Further, at the time of ignition, the temperature near the ignition part rises rapidly and the combustion gas expands in volume, but the heat-receiving wall 6a suppresses expansion in the outward direction and expands upward and in the circumferential direction of the burner part 14, resulting in a flame. It promotes the ignition of the air-fuel mixture diffused from the flame holes 15b of the ignition portion to the neighboring flame holes 15a and 15b and ejected from these flame holes.
Increasing the height of the heat receiving wall 6 over the entire circumference is more effective for igniting and accelerating the ignition of the adjacent flame holes, but the influence of cooling of the flame during normal combustion on the combustion performance and vaporization In order to maintain the heat resistance and the like of the material of the container, it is preferable to make the height of the heat receiving wall 6a higher than other parts only in the vicinity of the igniter 17.

Further, if the height of the heat receiving wall 6a is made higher than that of the flame hole 15b in the lower portion of the flame hole provided in the burner portion 14, the effect of strengthening the stagnation degree is large and the ignitability is also improved.

Further, if the height of the heat receiving wall 6a is increased, the temperature of the tip portion is increased. Therefore, if the vicinity of the tip portion is made of a part different from the vaporizer 1 and made of a material having higher heat resistance than the vaporizer 1, reliability is improved. Can be increased.

Next, as shown in FIG. 2, a bent portion 16a is provided at the upper end of the combustion ring 16 so that the unburned air-fuel mixture rising along the inner wall of the combustion ring 16 by the ascending air current at the time of ignition is bent. The resistance of 16a suppresses the rise and allows the current to be biased inward to promote ignition. That is, at the time of ignition, the flame holes 15a, 15b
The air-fuel mixture ejected from the ascends along the inner surface of the combustion ring 16 by the ascending airflow generated by the ejection speed and the heat of the heated vaporizer 1. When the flame hole 15b in the vicinity of the igniter 17 is ignited, the combustion exhaust gas (flame) that rapidly expands in temperature at the same portion is prevented from expanding upward by the bent portion 16a and is expanded in the circumferential direction in the combustion ring 16. Then, the flame is propagated to the adjacent flame holes in sequence. 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 is ignited. It is possible to ignite a small amount of upward leakage due to a 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 same as that of the flame hole 1 provided in the burner portion 14.
Providing above the uppermost flame holes of 5a and 15b is more effective in suppressing the rise of the air-fuel mixture ejected from all the flame holes.

[0022]

As described above, in the combustion apparatus of the present invention, the height of the heat receiving wall of the ignition part is higher than that of the other part, and the upper end of the combustion ring is provided with a bent part inward. As a result, the ignition of the mixed gas can be promoted, the flame propagation to other flame holes can be promoted, the outflow of the unburned mixture can be suppressed, and the odor at the time of ignition can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a combustion device 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]

 1 vaporizer 2 heater 3 vaporization element 4 nozzle 5 burner receiving seat 6, 6a heat receiving wall 14 burner portion 15a, 15b flame hole 16 combustion ring 16a bent portion 17 igniter

Claims (5)

[Claims] 1. A vaporization section for vaporizing liquid fuel, a heater for heating the vaporization section, a burner section having a large number of flame holes formed therein, and a flame hole for the burner section. An igniter for igniting fuel gas, a burner receiving seat on which the burner portion is placed and formed integrally with a vaporizing portion, and a heat receiving wall on the outer periphery of the burner receiving seat are provided, and A combustion device in which the height of the heat receiving wall near the igniter is higher than the height of the heat receiving wall of other portions. 2. The combustion device according to claim 1, wherein the height of the heat receiving wall near the igniter is set higher than the position of the lowermost flame hole formed in the burner portion. 3. The combustion apparatus according to claim 1, wherein the heat receiving wall near the igniter is formed as a separate part from the carburetor. 4. A vaporizer for vaporizing liquid fuel, a heater for heating the vaporizer, a burner portion having a large number of flame holes, and a fuel gas ejected from the burner portion. An igniter for igniting, a burner receiving seat on which the burner portion is mounted and formed integrally with a vaporizing portion, a heat receiving wall on the outer periphery of the burner receiving seat, and the burner receiving seat A combustion device in which a bottomed cylindrical combustion ring is provided on the outer peripheral side, and an inwardly bent portion is provided at the upper end 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.