JP2000111014A - Burner device having fuel preheating means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner device capable of shortening temperature raising time of a heat pipe heated by a burner flame, retaining a high temperature and preventing a jet in a liquid state. SOLUTION: A combustion nozzle device 2 comprises a nozzle holder 21 having an injection nozzle 22 protruding from an opening end of a passage connected to one end of a heat pipe 26, a mixing cylinder 24 fitted to an outer circumference of one tip end of the nozzle holder so as to make an air opening in a side part face the injection nozzle and a flame port nozzle 25 mounted on a tip end of the mixing cylinder, and is secured within a cover member 3 so as to be located with a specified distance from a tip end of the burner main body 1. The heat pipe disposed between the combustion nozzle device and the cover member is extended to a burner main body side on an axis same as that of the nozzle holder, and designed to be connected with a fuel passage via a connection cylinder member 27 formed within the tip end of the burner main body, and a heat insulated space is formed between the nozzle device and the burner main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handy type burner apparatus for promoting the vaporization by preheating fuel by liquefied gas by a burner flame in a flow process.

[0002]

In this type of burner device, a heat pipe is adopted as a fuel preheating means, and the heat pipe is heated by a burner flame to promote the vaporization of a liquefied gas flowing in the pipe, thereby obtaining a liquid. This prevents the danger that would occur if the gas was blown out.

[0003] However, in the conventional burner device, since the heat pipe is directly connected to the fuel passage in the burner main body, the heat of the heat pipe easily escapes to the burner main body side, and the burner flame generated by ignition occurs. It took time until the heat pipe was heated to a predetermined temperature. Also, if the crater nozzle is used downward before reaching the predetermined temperature, the liquefied gas cylinder will be inverted and a large amount of liquefied gas will flow into the fuel passage in a liquid state, and the temperature of the liquefied gas will prevail due to a decrease in pipe temperature due to heat of vaporization, Without complete vaporization by preheating, there is a danger that the liquefied gas would be ejected in a liquid state and burner flame would suddenly become large. Also, due to the installation of the combustion nozzle device by screwing in,
There is a problem that it is difficult to insulate the burner body and the combustion nozzle device.

The present invention has been conceived in order to solve the above-mentioned conventional problems, and has as its object to reduce the heat transfer to the burner main body by disposing the combustion nozzle device in a non-contact state with the burner main body. Accordingly, there is provided a burner device provided with a new fuel preheating means capable of shortening a heating time of a heat pipe heated by a burner flame and maintaining a high temperature, thereby preventing ejection in a liquid state. It is in.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a burner body having an arbitrary shape having therein a fuel passage extending from a front end to a rear end together with a valve device, a combustion nozzle device mounted on the front end of the burner body, and In a burner device comprising an outer peripheral cover member and a heat pipe for fuel preheating provided in the fuel passage with a middle portion bent at the crater nozzle of the combustion nozzle device, the combustion nozzle device is heated. A bottomed cylindrical nozzle holder with an ejection nozzle protruding from the open end of a flow path having a communication hole to which one end of the pipe is connected, and the air outlet on the side is ejected by fitting to the outer periphery of the tip of the nozzle holder. It is composed of a mixing cylinder facing the nozzle and the crater nozzle attached to the tip of the mixing cylinder, so that it is located at a predetermined distance from the tip of the burner body. A heat pipe attached to the inside of the bar member and connected to the combustion nozzle device at one end and disposed between the cover member and the heat pipe is extended on the same axis as the nozzle holder to the burner main body side, By connecting to the fuel passage through a connecting cylinder member airtightly fitted in a recess formed in the tip of the main body, and forming an adiabatic space between the combustion nozzle device and the burner main body It is.

In the above configuration, the heat pipe is heated by the burner flame from the crater nozzle, and 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 prevented that the liquid gas is jetted out of the jet nozzle in the liquid state. In addition, since the escape of heat to the burner main body side is limited by the heat insulating space between the combustion nozzle device and the burner main body,
The mixing cylinder and the nozzle holder are also heated by the heat pipe and accumulate heat, and as a result, the heating time of the heat pipe is shortened and the high temperature can be maintained.
The efficiency of liquefied gas vaporization is increased, and when the crater nozzle is used facing down, even if the liquefied gas flows into the fuel passage in a liquid state, it is completely vaporized by preheating with a heat pipe, and the temperature of the pipe decreases due to the heat of vaporization. Even if it does, the temperature required for vaporization is maintained, so that it does not squirt in a liquid state, and the danger of an unexpectedly large burner flame is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 denotes a burner main body, 2 denotes a combustion nozzle device, 3 denotes a cover member, and 4 denotes a piezoelectric ignition device. The burner main body 1 has an axial fuel passage 11 extending from the front end to the rear end in the center of the inside thereof. The fuel passage 11 is divided into a front portion 11a and a rear portion 11b with a bent portion of the main body.
The valve body 13 of the valve device 12 attached to the main body bent portion is provided at the boundary. The valve device 12 is provided with a knob 15 screwed to the outer end of a shaft portion 14 integrated with the valve body 13.
Thereby, the valve body 13 is rotated together with the shaft portion 14 to close or open the fuel passage 11 and further to adjust the flow rate of the liquefied gas.

A screw is formed on the outer periphery of the rear end of the burner main body 1, and a connection cap 10 a fitted to the top of the liquefied gas cylinder 10 is rotatably attached to the rear end. A recess 20 having a required depth is formed in the front end portion of the burner main body 1 so that a front portion 11a of the fuel passage 11 is opened. The piezoelectric ignition device 4 is mounted on a side portion of the burner body 1 with the operation member 41 facing backward. It is.

The combustion nozzle device 2 has a bottomed cylindrical nozzle holder 21 and an air port 23 which is fitted to the outer periphery of the tip of the nozzle holder 21 and which is attached to an ejection nozzle 22 attached to the nozzle holder tip opening. A communication hole 21b is formed in a flow path 21a formed of the mixing cylinder 24 and the crater nozzle 25 attached to the tip of the mixing cylinder 24, and formed in the axial direction of the nozzle holder 21. One end 26a of the heat pipe 26 is connected to the communication hole 21b.

The heat pipe 26 extends along the longitudinal direction of the combustion nozzle device, and has a substantially U-shaped planar shape that is bent in an arc at an intermediate portion corresponding to the crater nozzle. One end 26a is connected to the communication hole 21b of the nozzle holder 21 and the other end 26b is disposed on the same axis of the nozzle holder 21 as described above. It extends to one side. In the heat pipe 26,
The part which is bent and formed into a U shape is further bent into an L shape,
It is also possible to form so as to be located on the front side of the crater nozzle 25.

The other end 2 of the heat pipe 26
6b is connected via a connecting cylinder member 27 to a recess 20 provided with a fuel passage having a wide diameter at the tip of the burner body. The connecting cylinder member 27 is inserted through the heat pipe 26 and hermetically fitted in the recess 20 with an O-ring 28 (for example, synthetic resin, synthetic rubber, silicone rubber, etc.) having excellent heat insulation at the rear. The required heat insulation space S is formed at the tip of the burner body.
Accordingly, the other end 26b of the heat pipe 26 communicates with the fuel passage 11a, and the fuel (liquefied gas) supplied from the liquefied gas cylinder 10 reaches the combustion nozzle device 2 via the heat pipe 26.

Further, in order to expand the heat insulating space S, the combustion nozzle device 2 is mounted in the cover member 3 so as to be located at a predetermined distance from the opening of the tip of the burner main body 1. The mounting position is set by a screw hole 3 a formed in the cover member 3, and the mixing cylinder 24 of the combustion nozzle device 2 is provided with a support projecting around its outer periphery to a size substantially matching the inner diameter of the cover member 3. The screwing portion 24 corresponding to the screw hole together with the flange 24a
b is provided, and the screw hole 3a and the screwed portion 24b are fastened by a screw screw 30 at a position where they coincide with each other.

Therefore, the cover member 3 is attached to the burner main body 1 after the combustion nozzle device 2 is fitted thereto, and the connecting tubular member having the heat pipe inserted therein is fitted into the recess of the burner main body. The burner body 1 is fixed to the burner main body 1 from an appropriate place on the outside with a screw or the like.

In addition to the attachment of the cover member, the piezoelectric ignition device 4 is also provided, and the discharge electrode 42 is located on the side of the crater nozzle 25, and the discharge electrode 42 leaks from the hole below the crater nozzle due to discharge. After igniting a mixed gas of liquefied gas and air for use, the mixed gas ejected from the crater nozzle 25 can be burned.

In the burner device having the above-described structure, the liquefied gas flowing from the liquefied gas cylinder 10 into the fuel passage 11 flows into the heat pipe 26 and flows to the front crater nozzle 25 along the length of the combustion nozzle device. After that, it returns to the nozzle holder 21, flows into the flow path 21 a, and is ejected from the ejection nozzle 22 at the tip into the mixing cylinder 24.

The liquefied gas is mixed with air in the mixing cylinder while flowing to the crater nozzle 25 through the above-mentioned air port 23 and reaches the crater nozzle 25 by this ejection, and flows out of the crater nozzle 25 to the outside. Become like When this mixed gas is ignited and burned by discharge, it becomes a burner flame,
The heat pipe 26 is heated by the burner flame, and the temperature of the heat pipe 26 rises. Thereby, the liquefied gas in the pipe is preheated, and the vaporization is promoted. For this reason, even if the liquefied gas flows into the pipe in a liquid state, it is completely vaporized before returning to the nozzle holder 21, thereby preventing liquid jetting.

Further, since the escape of heat to the burner main body 1 is restricted to a small extent by the heat insulating space S, the combustion nozzle device 2 is also heated by the heat pipe 26 and stores heat. The heating time is shortened and the high temperature can be maintained.
Increases the efficiency of promoting liquefied gas vaporization.

Therefore, even when the liquefied gas cylinder is turned upside down and a large amount of liquefied gas flows into the fuel passage 11 in a liquid state when the crater nozzle 25 is used downward, it is completely vaporized by preheating by the heat pipe 26, and Even if the pipe temperature decreases due to the heat of vaporization, the temperature does not decrease until hindering vaporization. The danger that suddenly arises is also prevented.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a burner device provided with a fuel preheating means according to the present invention.

FIG. 2 is a cross-sectional view of a main part of a burner device including a fuel preheating unit according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 burner main body 2 combustion nozzle device 3 cover member 4 piezoelectric ignition device 11 fuel passage 12 valve device 13 valve body 20 recess 21 nozzle holder 21a flow path 21b communication hole 22 ejection nozzle 24 mixing cylinder 24a support flange 24b screw connection portion 25 Nozzle 26 Heat pipe 27 Connecting cylinder member 28 O-ring

Claims (1)

[Claims] 1. A burner body of an arbitrary shape having therein a fuel passage extending from a front end to a rear end together with a valve device, a combustion nozzle device mounted on a front end of the burner body, a cover member on an outer periphery thereof, and the combustion nozzle. A burner device comprising a heat pipe for fuel preheating provided in the fuel passage with the middle part bent at the crater nozzle of the device, the communication nozzle having one end of the heat pipe connected to the combustion nozzle device. A bottomed cylindrical nozzle holder with an ejection nozzle protruding from the opening end of the flow path, a mixing cylinder fitted to the outer periphery of the tip of the nozzle holder and having a side air port facing the ejection nozzle, and a mixing cylinder. With the crater nozzle attached to the tip of the cylinder, and attached to the cover member so as to be located at a predetermined interval from the tip of the burner body,
A heat pipe connected to the combustion nozzle device at one end and disposed between the cover member and the nozzle holder was extended to the burner main body side on the same axis as the nozzle holder, and was formed in the distal end portion of the burner main body. The fuel preheating means is characterized in that the fuel preheating means is connected to the fuel passage through a connection cylinder member which is airtightly fitted in the recess, and an insulating space is formed between the combustion nozzle device and the burner main body. Burner device equipped.