JP3916108B2 - Burner device with fuel preheating means - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a handy-type burner device that promotes vaporization by preheating fuel by liquefied gas with a burner flame in a flow process.
[0002]
[Problems to be solved by the invention]
In this type of burner device, a heater pipe is used as a fuel preheating means, the heater pipe is heated by a burner flame to promote vaporization of the liquefied gas flowing in the pipe, and there is a risk that occurs when it is ejected in liquid form. It is preventing.
[0003]
However, since the conventional burner device performs the heater pipe directly in the fuel passage in the burner body, the heat of the heater pipe easily escapes to the burner body side, and the heater pipe is caused by the burner flame generated by ignition. It took time until was heated to a predetermined temperature. If the crater nozzle is turned downward before reaching the predetermined temperature, the liquefied gas cylinder is inverted and a large amount of liquefied gas flows into the fuel passage in a liquid state. There was a danger that the vaporization of the liquefied gas would occur in a liquid state and the burner flame would be unexpectedly large without being completely vaporized by preheating.
Further, since the combustion nozzle device is attached by screwing, it is difficult to insulate the burner body from the combustion nozzle device, and there is a problem that assembly is troublesome.
[0004]
The present invention has been conceived in order to solve the above-described conventional problems. The object of the present invention is to reduce the heat transfer to the burner body by using fitting means for mounting the combustion nozzle device and to assemble the device. In addition, it is possible to shorten the heating time of the heat pipe heated by the burner flame and maintain the high temperature by attaching the heat pipe to the combustion nozzle device side, thereby preventing the liquid jet. An object of the present invention is to provide a burner device equipped with new fuel preheating means that can be prevented.
[0005]
[Means for Solving the Problems]
According to the above object, the present invention provides an arbitrarily shaped burner body having a fuel passage extending from the front end to the rear end together with the valve device, a combustion nozzle device mounted in a recess in the front end portion of the burner body, its cover member, and a combustion nozzle It consists of a heat pipe for fuel preheating provided in the fuel passage, with the middle portion of the crater nozzle of the device bent,
In the combustion nozzle device, an axial flow path that is cylindrical and bored in the center of the inside is partitioned into front and rear portions by a partitioning section, and the ejection nozzle is attached to the opening end of the front flow path so that the ejection nozzle is at the tip. A nozzle holder connected to the heat pipe across the front flow path and the rear flow path, and a mixing cylinder fitted on the outer periphery of the tip of the nozzle holder so that the side air port faces the ejection nozzle In the burner device composed of the crater nozzle attached to the tip of the mixing cylinder,
An annular groove is provided around the rear outer periphery of the nozzle holder, and the outer diameter of the nozzle holder excluding the end where the O-ring outside the annular groove is fitted is formed smaller than the inner diameter of the recess, and the nozzle holder The rear part is hermetically fitted to the recess together with the O-ring , the rear passage is connected to the fuel passage , the heat insulating space is formed around the rear part extending from the annular groove to the recess opening, and the combustion nozzle device And the cover member are attached to the burner body by screw screws screwed into the recesses from the outside of the cover member , and the inner peripheral surface of the crater nozzle is formed on an uneven surface such as a screw groove or an annular groove. It has been said.
[0008]
In the said structure, the bending part of a heat pipe is heated by the burner flame from a crater nozzle, the liquefied gas in a pipe is preheated, and vaporization is accelerated | stimulated. For this reason, even if the liquefied gas flows into the pipe in a liquid state, it is prevented from being ejected in a liquid state from the ejection nozzle. Further, in the nozzle holder, the escape of heat to the burner body is limited to a small extent by the O-ring and the heat insulating gap, so the nozzle holder is also heated by the heat pipe to store heat. As a result, the heat pipe rises. The heat time is shortened and the high temperature can be maintained, the efficiency of vaporization promotion of liquefied gas is increased, and even if the liquefied gas flows into the fuel passage in the liquid state when used with the crater nozzle facing downward, the heat pipe Even if the pipe temperature is lowered due to the preheating by the heat, and the pipe temperature is lowered by the heat of vaporization, the temperature necessary for vaporization is maintained, so there is no liquid jetting and the burner flame is unexpectedly large. Dangers that occur are also prevented.
[0009]
Also, the burner flame is stabilized by the turbulent flow generated by the uneven inner surface of the crater nozzle, and even if the crater nozzle is formed short, it does not blow off from the crater and disappears. Even if the apparatus is located on the liquefied gas cylinder, it can be made difficult to fall over when placed together with the liquefied gas cylinder.
[0010]
Furthermore, since the combustion nozzle device is attached to the burner body by fitting the nozzle holder, the structure is simplified compared to the case of screwing, and finally the combustion nozzle device and the cover member with one screw screw. Can be fastened to the burner body, making assembly easier and reducing manufacturing costs.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the figure, 1 is a burner body, 2 is a combustion nozzle device, 3 is a cover member, and 4 is a piezoelectric ignition device.
The burner body 1 has a shape in which the main portion 12 can be obliquely mounted on the liquefied gas cylinder 13 by bending the rear end portion 11, and an axial fuel passage 14 extending from the front end to the rear end in the center of the inside. Have The fuel passage 14 is divided into a front portion 14a and a rear portion 14b with a main body bent portion as a boundary, and a valve body 16 of a valve device 15 attached to the main body bent portion is provided at the boundary. The valve device 15 rotates the valve body 16 together with the shaft portion 17 by a knob 18 screwed to the outer end of the shaft portion 17 integrated with the valve body 16 to close or open the fuel passage 14, and further liquefies. It consists of a structure that adjusts the gas flow rate.
[0012]
A screw is applied to the outer periphery of the rear end portion 11 of the burner body 1, and a connecting cap 19 that fits the top portion of the liquefied gas cylinder 13 is rotatably attached to the rear end portion 11. Further, a recess 20 having a required depth in which the front portion 14a of the fuel passage 14 is opened is provided in the front end portion of the burner body 1, and the piezoelectric ignition device 4 faces the operation member 41 upward on the lower side portion. It is installed.
[0013]
The combustion nozzle device 2 includes a cylindrical nozzle holder 21, a mixing cylinder 24 fitted on the outer periphery of the tip of the nozzle holder 21, and an air outlet 23 facing the jet nozzle 22 at the tip of the nozzle holder, and the mixing thereof The crater nozzle 25 is attached to the tip of the cylinder 24, and the inner peripheral surface of the crater nozzle 25 is formed as an uneven surface such as a screw groove or an annular groove.
[0014]
In the center of the inside of the nozzle holder 21, a flow path 26 partitioned into a front part 26a and a rear part 26b by a partition part 21a is formed in the axial direction, and the front flow path 26a located on the same axis line. And the heat pipe 27 is connected over the rear channel 26b. The heat pipe 27 has a U-shaped planar shape that is bent in the middle in an arc shape and further bent in an L shape on one side, and the bent portion 27a is positioned in front of the nozzle 25 so that the cover It is disposed between the member 3 and the mixing cylinder 24.
[0015]
An annular groove 28 is provided around the outer periphery of the rear portion of the nozzle holder 21, and an O-ring 28 (for example, synthetic resin, synthetic rubber, silicone rubber, etc.) having excellent heat insulation is provided around the outer periphery of the end portion outside the annular groove 28. ) Is fitted. Except for the outer diameter of the rear end portion 21 b fitted with the O-ring 28, the outer diameter of the nozzle holder 21 is larger than the inner diameter of the recess 20 so that a necessary heat insulation gap is formed between the nozzle holder 21 and the recess 20. Is also slightly smaller in diameter.
[0016]
In the combustion nozzle device 2 having such a nozzle holder 21, the rear end portion 21 b of the nozzle holder 21 is fitted in an airtight manner through an O-ring 28 in a recess 20 formed in the front end portion of the burner body 1. Is attached to the burner body 1, and the rear passage 26 b is connected to the fuel passage 4 by this attachment. Further, the discharge electrode 42 of the piezoelectric ignition device 4 mounted in advance by the mounting is located at the side of the crater nozzle 25, and a mixed gas of pilot liquefied gas and air leaking from the hole below the crater nozzle by discharge is supplied. After ignition, the mixed gas ejected from the crater nozzle 25 can be combusted.
[0017]
The cover member 3 is attached to the burner body 1 after the combustion nozzle device 2 is fitted or together with the combustion nozzle device 2. This simultaneous attachment can be easily performed by connecting both of them with the joint plate 31. After the mounting, the screw screw 32 is screwed into the annular groove 28 of the nozzle holder 21 from the outside of the cover member 3 through the burner main body 1, and both are fixed to the burner main body 1 by the screw screw 32. This prevents the cover member 3 and the combustion nozzle device 2 from falling off.
[0018]
In the burner device configured as described above, the liquefied gas that has flowed into the fuel passage 14 from the liquefied gas cylinder 13 flows into the heat pipe 27 from the rear passage 26b of the nozzle holder 21 and flows to the front of the crater nozzle 25, and then again. It returns to the nozzle holder 21 and flows into the front channel 26b, and is ejected into the mixing cylinder 24 from the ejection nozzle 22 at the tip.
[0019]
While the air is taken in from the air port 23 by this ejection and reaches the crater nozzle 25, the liquefied gas is mixed with air in the mixing cylinder and flows out from the crater nozzle 25 as a mixed gas. . When this mixed gas is ignited and burned by discharge, a burner flame is formed, and the bent portion 27a of the heat pipe 27 is heated by the burner flame, and the temperature of the heat pipe 27 rises. As a result, the liquefied gas in the pipe is preheated to promote vaporization. For this reason, even if the liquefied gas flows into the pipe in a liquid state, it is completely vaporized until it returns to the nozzle holder 21, thereby preventing a liquid jet.
[0020]
Further, in the nozzle holder 21 fitted into the recess 20 via the O-ring 28, the escape of heat to the burner body 1 is limited to a small extent by the O-ring 28 and further by the heat insulating gap. As a result, the heat pipe 27 is heated to store heat, and as a result, the temperature rise time of the heat pipe 27 is shortened and the high temperature can be maintained, and the efficiency of vaporization of liquefied gas by the heat pipe 27 is increased. .
[0021]
Therefore, when the crater nozzle 25 is used with the crater nozzle 25 facing downward, even if the liquefied gas cylinder is inverted and a large amount of liquefied gas flows into the fuel passage 14 in a liquid state, it is completely vaporized by the preheating by the heat pipe 27, and also by the heat of vaporization. Even if the pipe temperature may drop, the temperature will not drop until it interferes with vaporization. Dangers that occur are also prevented. The burner flame is stabilized by the turbulent flow generated by the uneven inner surface of the crater nozzle 25, and even if the crater nozzle 25 is formed short, it does not blow off from the crater and disappear. For this reason, in consideration of the balance when attached to the liquefied gas cylinder 13, the length of the combustion portion is formed to be short overall, so that the liquefied gas cylinder 13 cannot be easily overturned.
[0022]
In addition, when the combustion nozzle device 2 is attached to the burner body 1 by fitting the nozzle holder 21 instead of screwing, all the attachment is performed by inserting, so that the structure is simplified and assembled. In the end, the combustion nozzle device 2 can be attached together with the cover member 3 with a single screw screw 32, which also reduces the manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a burner device provided with fuel preheating means according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is a top view of the combustion nozzle device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Burner main body 2 Combustion nozzle apparatus 3 Cover member 4 Piezoelectric ignition apparatus 11 Rear end part 12 Main part 14 Fuel passage 15 Valve apparatus 16 Valve body 20 Recess 21 Nozzle holder 21a Partition part 22 Injection nozzle 24 Mixing cylinder 25 Tinder nozzle 26 Flow Path 26a front channel 26b rear channel 27 heat pipe 28 O-ring 29 annular groove 32 screw screw 42 discharge electrode

Claims (2)

A burner body having an arbitrary shape having a fuel passage extending from the front end to the rear end together with the valve device, a combustion nozzle device mounted in a recess in the front end portion of the burner main body and its cover member, and a middle portion of the crater nozzle of the combustion nozzle device And a heat pipe for fuel preheating provided in the fuel passage,
In the combustion nozzle device, an axial flow path that is cylindrical and bored in the center of the inside is partitioned into front and rear portions by a partitioning section, and the ejection nozzle is attached to the opening end of the front flow path so that the ejection nozzle is at the tip. A nozzle holder connected to the heat pipe across the front flow path and the rear flow path, and a mixing cylinder fitted on the outer periphery of the tip of the nozzle holder so that the side air port faces the ejection nozzle In the burner device composed of the crater nozzle attached to the tip of the mixing cylinder,
An annular groove is provided around the rear outer periphery of the nozzle holder, and the outer diameter of the nozzle holder excluding the end where the O-ring outside the annular groove is fitted is formed smaller than the inner diameter of the recess, and the nozzle holder The rear part is hermetically fitted to the recess together with the O-ring , the rear passage is connected to the fuel passage , the heat insulating space is formed around the rear part extending from the annular groove to the recess opening, and the combustion nozzle device A burner device comprising fuel preheating means, wherein the cover member and the cover member are attached to the burner body by screw screws screwed into the recess from the outside of the cover member .   2. The burner apparatus with fuel preheating means according to claim 1, wherein the inner peripheral surface of the crater nozzle is formed as an uneven surface such as a screw groove or an annular groove.

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