JP2003074807A - Liquid fuel combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent malfunctioning of a safety device, which is caused by deformation of a burner port mesh. SOLUTION: In a liquid fuel combustion device which is provided with a tank 1 for storing liquid fuel, a pump 2 for sucking fuel from the tank 1, an evaporator 3 for evaporating fuel fed by the pump 2, a nozzle 4 which is provided to the evaporator 3, for ejecting the evaporation gas, a mixing tube 5 which is disposed at the position facing the nozzle 4, for performing mixing by the ejector effect of the evaporation gas, while sucking primary air, and a burner 6 for burning the mixed gas ejected from a burner port 7 provided above the mixing tube 5, a burner port mesh 10 which forms the burner port 7 is provided with a recessed bead 12 along the longitudinal direction of the burner port mesh 10.

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 such as a petroleum fan heater that vaporizes and jets liquid fuel to burn it.

[0002]

2. Description of the Related Art Conventionally, in this type of liquid fuel combustion apparatus,
As shown in FIG. 5, the cartridge tank 15 is attached to the tank 1.
Liquid fuel is supplied from the tank 1, and the liquid fuel in the tank 1 is supplied to the carburetor 3 by the pump 2 and vaporized by the heating of the heater 16, and the nozzle 4 causes the mixing pipe 5 of the burner 6 to flow.
Erupted into.

The liquid fuel ejected from the nozzle 4 in the mixing pipe 5 is mixed in the mixing pipe 5 while sucking the primary air by the ejector effect, and the mixed gas is constituted by the burner top 17 and the partition plate 18. It enters a pressure regulation chamber (not shown), is jetted from the flame hole network 10 through the rectifying network 19, and is ignited and burned by an ignition device (not shown). Then, the flame lot 20 confirms the presence / absence of combustion, and if there is a combustion flame, it is continuously burned.
The combustion gas generated at this time is guided upward in the combustion chamber 11 provided so as to cover the periphery of the burner 6, mixed with the air from the blower 13 at the outlet of the combustion chamber 11, and discharged from the louver 22 as warm air. It is used for heating. And
In this liquid fuel combustion device, when the fuel supply amount is adjusted by changing the drive frequency of the pump 2 or the applied voltage, the primary air amount also increases / decreases accordingly, and the combustion amount is maintained while the ratio of liquid fuel and air is kept constant. It can be changed. The vaporizer 3 has a heat receiving fin 8, a heater 16 for heating and vaporizing the fuel, a thermistor (not shown) for detecting the temperature of the vaporizer 3, and a nozzle 4.

The heat receiving fins 8 reduce the power consumption of the heater 16, and one end thereof is fixed to or integrated with the carburetor 3. The other end of the burner 6 faces the flame hole 7 provided in the burner 6 and is disposed so as to be exposed to the combustion flame formed in the flame hole 7.

A metal flame hole network 10 is used for the flame holes 7, and the burner 6 has a partition plate 18 which is sandwiched between the burner top 17 and the mixing tube 5 combined with the burner top 17. The burner top 17 has a flame hole net 10 with excellent heat resistance and high temperature resistance.
And a rectifying network 19 for adjusting the pressure of the mixed gas.

The heat recovered by the heat receiving fins 8 heats the vaporizer 3 together with the heater 16. Before the start of combustion, that is, before the combustion flame is formed, the fuel is preheated to a predetermined temperature by the heater 16 and becomes combustion gas. The carburetor 3, the burner 6, the ignition device, the flame lot 20 and the like are fixed to the burner base 9, and the combustion chamber 11 is fixed to the burner base 9.

Further, as described in Japanese Patent No. 2975479, the shape of the flame hole network 10 is flat or has a gentle mountain shape.

[0008]

However, in the above-mentioned conventional one, the flame hole network 10 expands due to the heat of the flame during combustion and rises into a mountain shape, and returns to its original shape when the operation is stopped. , While stopping many times,
The flame net 10 is plastically deformed, does not return to its original shape even when the operation is stopped, and maintains a state in which it is bulged more than necessary. Therefore, as the frequency of use of the liquid fuel combustion apparatus increases, the degree of swelling due to plastic deformation of the flame hole net 10 increases, and the flame hole net 10 has a size of several mm.
There is a problem that the frame lot 20 provided above may come into contact with the raised portion, and the safety device may malfunction and become inoperable.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a tank for storing a liquid fuel, a pump for sucking the fuel from the tank, and a fuel supplied by the pump. A vaporizer for vaporizing the gas, a nozzle for ejecting the vaporized gas provided in the vaporizer, and a primary air sucking mixture due to the ejector effect of the vaporized gas ejected at the position facing the nozzle. In a liquid fuel combustion apparatus equipped with a mixing pipe and a burner for injecting and burning a mixed gas from a flame hole provided above the flame, a flame hole network forming the flame hole is formed along a longitudinal direction of the flame hole network. It has a concave bead.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3.

FIG. 1 is a side sectional view of a liquid fuel combustion apparatus according to one embodiment of the present invention, and FIG. 2 is an external view of a burner in which a concave bead is provided on a flame hole network according to one embodiment of the present invention. is there. FIG. 3 is a side sectional view of a liquid fuel combustion apparatus according to an embodiment of the present invention.

The same reference numerals as those already used in the description of FIG. 5 denote the same parts.

In these figures, a tank 1 for storing liquid fuel is provided on the lower side of a liquid fuel combustion apparatus, and a cartridge tank 15 is detachably installed on the tank 1. Two
Is a pump arranged on the upper surface of the tank 1, and an oil feeding pipe (not shown) is connected to the carburetor 3 from the upper end thereof. The vaporizer 3 includes a temperature detecting means (not shown) such as a thermistor for detecting the temperature of the vaporizer 3, a heater 16 for keeping the vaporizer 3 at a predetermined temperature based on the output from the temperature detecting means, A vaporization element 21 for efficiently vaporizing the supplied fuel, a nozzle 4 for ejecting vaporized gas, and a needle valve (not shown) for opening and closing the nozzle 4 are provided. The burner 6 has a partition plate 18 sandwiched between the burner top 17 and the mixing tube 5. Burner top 17
A flame net 10 having excellent heat resistance and high-temperature oxidation resistance and a rectifying net 19 for adjusting the pressure of the mixed gas are attached to this.

The heat recovered from the burner 6 by the heat receiving fins 8 heats the vaporizing chamber of the vaporizer 3 together with the heater 16. Before combustion is started, that is, before combustion flame is formed, the fuel is preheated to a predetermined temperature by the heater 16 and becomes combustion gas.

Reference numeral 11 denotes a combustion chamber which covers the burner 6 and guides the combustion gas upward, and a blower 13 for taking in and discharging indoor air is provided at the back of the combustion chamber.

The carburetor 3, burner 6 and combustion chamber 11 are fixed to the burner base 9.

Reference numeral 14 denotes a predetermined sequence for the pump 2, the blower 13, etc., based on a signal from an operating section for controlling the energization of the heater 16 based on the output from the carburetor temperature detecting means and an operating condition. It is a control unit controlled by.

Here, a combustion chamber 11 is formed above the burner base 9, and a secondary air introduction hole 23 is provided below the side surface of the combustion chamber 11, and this secondary air hole 23 is formed. A lower opening 25 and an upper opening 26 are provided in a lower portion and an upper portion of the air guide 24 so as to cover the inner surface, and the secondary air is blown.

The flame hole network 10 forming the flame holes 7 is provided with a gentle mountain-shaped bulge in consideration of the flame to be formed, and is elongated and concave along the longitudinal direction of the flame hole network 10. Beads 12 are provided.

Further, the frame lot 20 is positioned a few mm above the flame hole network 10 and a part thereof is exposed to the flame, and when there is the flame, the flame current from the flame lot 20 is generated. Since the flame is detected, combustion operation is continued, but when there is no flame, that is, when the flame disappears, flame is not detected because flame current does not occur. Therefore, the safety device that stops the pump 2 and stops the combustion operation. Is working.

In the liquid fuel combustion apparatus constructed as described above, the liquid fuel is supplied from the cartridge tank 15 to the tank 1 so as to maintain a constant oil level, and the pump 2
Is sucked up from the tank 1 and sent to the vaporizer 3. The sent liquid fuel is heated to a predetermined temperature by the heater 16, is vaporized by the vaporization element 21 in the vaporizer 3 to become high-pressure vapor, and is ejected from the nozzle 4. At that time, the primary air is sucked by the ejector effect and the downstream is obtained. Burner 6 installed on the side
Is supplied to and burned. The combustion gas generated at this time flows upward in the combustion chamber 11, and the soto duct 27
Inside, it is mixed with the indoor air flow from the blower 13 to generate warm air and is discharged indoors.

Further, the control unit 14 controls the heater 16, the pump 2, the blower 13 and the like in a predetermined sequence based on the operating conditions set by the user to start, stop or burn the operation. Performs variable operation control.

Explaining the combustion in the burner 6, the vaporized gas ejected from the nozzle 4 is mixed in the mixing pipe 5 provided on the downstream side of the vaporizer 3 while sucking the primary air by the ejector effect, and the burner is burned. A large number of flame holes 7 provided above 6 uniformly eject and burn. Further, the heat receiving fins 8 are heated by the combustion flame formed by the burner 6, and the temperature of the carburetor 3 is kept constant by the action of heat recovery from the combustion flame, so that part of the energization of the heater 16 or All are reduced. At this time, the flame in the combustion chamber 11 is the flame hole 7
Although it is formed on the upper side and extends toward the outlet side of the combustion chamber 11, secondary air is blown to the upper and lower portions from the air guide 24 provided on the rear surface of the combustion chamber 11, so the flame at the time of maximum combustion is guided by the air guide. Combustion can be accelerated by 24 secondary air. Further, at the time of minimum combustion, the secondary air in the upper opening 26 of the air guide 24 flows out to the upper portion as it is, but the secondary air from the lower opening 25 of the air guide 24 can blow only the amount of air required for the minimum flame. Therefore, complete combustion can be efficiently performed.

Further, the secondary air flowing into the combustion chamber 11 through the lower opening 25 is warmed by hitting the burner base 9 having a high temperature once and is rectified, so that a stable secondary air is supplied to the flame. It is possible.

At the same time, the air from the lower space of the combustion chamber 11 is rectified by the air from the lower opening 25 of the air guide 24, and the influence of the air from the lower space of the combustion chamber 11 can be reduced.

Further, even if the flame hole network 10 expands due to the heat of the flame during combustion, the flame hole network 10 is provided with a slender concave bead 12 along the longitudinal direction of the flame hole network 10, Flame net 1
At 0, the mountain-shaped so-called bulge portion excluding the bead 12 tends to extend upward, but the concave-shaped so-called dent portion of the bead 12 tends to extend downward, so that the bulge on the flame hole network 10 Since the portion and the recessed portion buffer each other, the flame hole network 10 does not undergo plastic deformation.

In this embodiment, the number of the beads 12 formed in the flame net 10 is one, but the number of beads 12 may be plural as shown in FIG. Dispersing the cushioning between the bulging portion and the recessed portion on the flame hole network 10 further promotes the plastic deformation preventing action.

[0028]

As described above, according to the present invention,
By providing elongated beads along the longitudinal direction of the flame net in the flame net, even if the net expands due to the heat of the flame, the bulge excluding the bead and the depression of the bead on the flame net. Since the portions and the portions cushion each other so as to extend upward and downward, plastic deformation of the flame hole network can be prevented, and safety can be improved.

Further, by making the number of beads formed in the flame hole network a plurality, the cushioning between the bulging portion and the recessed portion on the flame hole network can be performed more efficiently, so that the reliability of preventing plastic deformation is improved. It was possible to further improve the sex.

[Brief description of drawings]

FIG. 1 is a side sectional view of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is an external view of a burner in which a concave bead is provided on a flame hole network according to an embodiment of the present invention.

FIG. 3 is a side sectional view of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 4 is an external view of a burner in which a plurality of concave beads are provided on a flame net according to another embodiment of the present invention.

FIG. 5 is a side sectional view of a conventional liquid fuel combustion device.

[Explanation of symbols]

1 tank 2 pumps 3 vaporizer 4 nozzles 5 mixing tubes 6 burners 7 flame holes 10 Flame network 12 beads

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshihiko Hisada             Chiba Prefecture Kashiwa City Shinjuyo 3-3 1 Sun Co., Ltd.             Standing Home Tech F term (reference) 3K052 AA10 DA01 DB01

Claims (2)

[Claims] 1. A tank (1) for storing liquid fuel, a pump (2) for sucking fuel from the tank (1), and a vaporizer (3) for vaporizing the fuel supplied by the pump (2). And a nozzle (4) provided in the vaporizer (3) for ejecting vaporized gas, and primary air is generated by an ejector effect of the vaporized gas ejected at a position facing the nozzle (4). In a liquid fuel combustion apparatus including a mixing pipe (5) for mixing while sucking, and a burner (6) for injecting and burning a mixed gas from a flame hole (7) provided above the flame, a flame hole (7) ) Forming a hole network (1
A liquid fuel combustion apparatus characterized in that a bead (12) having a concave shape is provided in (0) along the longitudinal direction of the flame net (10). 2. The concave bead (12) is attached to the flame net (1).
2. The liquid fuel combustion apparatus according to claim 1, wherein a plurality of them are provided in 0).