JPH0512583Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a nozzle for a small burner device used for welding, fusing, or processing various metals.

[Prior Art] The burner device disclosed in Japanese Patent Application Laid-Open No. 54-26539 has a fluid regulating device inserted into the tip of the nozzle pipe, and the fluid regulating device divides the flow path in the nozzle pipe into a main channel and a secondary channel. It has a simple structure divided into a flow path and a flow path. Further, the discharge electrode is provided from the outside of the nozzle tube toward the crater.

[Problems to be solved by the invention] In such conventional burner devices, the tip of the nozzle tube forming the crater is easily heated by the combustion flame, and even for a short combustion time, the heating is The entire pipe was in danger.

Furthermore, if the nozzle tube is heated up to the burner body due to long-term use, the vaporization of the liquefied gas within the burner body may be affected, and the combustion flame may become unstable.

Furthermore, since the discharge electrode is installed on the outside of the nozzle tube, it often hits other objects and becomes misaligned.
There are also problems such as poor ignition due to loss of proper discharge gap.

This invention was devised to solve the above-mentioned conventional problems, and its purpose is to provide a burner device nozzle with a new configuration that can solve the problems related to nozzle tube heating and electrodes by simple means. It's about doing.

[Means for Solving the Problems] The feature of this invention for the above purpose is that an insulating tube made of ceramic is fitted to the tip of the nozzle tube provided in the front part of the burner body to surround the tip of the nozzle tube,
The insulating tube is covered with a crater cover, thereby solving the conventional problems.

[Function] In the above configuration, the heat transfer to the nozzle pipe during combustion is reduced by the ceramic insulating tube,
The nozzle tube does not get hot even when used for a long time. Furthermore, since the discharge electrode is provided within the nozzle cover with an insulating tube, the appropriate discharge gap is not impaired by other objects, and good ignition is always maintained.

[Embodiment] Reference numeral 1 in the figure is a burner main body, a nozzle pipe 2 is screwed to the front part, and a valve device 3 capable of adjusting the flow rate is screwed to the rear part. Further, a cylindrical connecting part 4 is integrally formed at the lower part.

The connecting portion 4 is threaded on the inside and outside, and a connecting member 5 is rotatably screwed onto the inside and a cap-shaped tightening member 6 around the outer periphery.

The nozzle pipe 2 includes a nozzle base pipe 21 whose rear end is screwed to the burner body 1, and a nozzle base pipe 21 whose rear end is screwed to the burner body 1.
It consists of a tubular nozzle tip 22 screwed onto the tip of the nozzle tip.

A filter 23 is provided in the rear end of the nozzle base pipe 21.
Additionally, an injection nozzle 24 is provided, and an air port 25 is bored in the wall on the side of the injection port.

A cylindrical nozzle head 26 is attached to the tip of the nozzle tip 22 with its rear end fitted into the opening at the tip of the nozzle tip, thereby forming a crater. A large number of vertical grooves 27 are provided around the outer periphery of the nozzle head 26, and a part of the flow path 28 in the nozzle pipe is branched by the vertical grooves 27.
A main flow path 28a and a sub flow path 28b are provided inside and outside the nozzle head.
is occurring.

Further, ring members 29 and 30 are fitted around the opening end of the nozzle head 27 and around the side outer periphery. The ring member 29 is fixed and also serves as an electrode, while the other ring member 30 is movable and acts as a gas flow resistor.

An insulating tube 31 made of ceramic is fitted around the outer periphery of the tip of the nozzle tip 22. This insulating tube 31 serves both as a protective material surrounding the tip of the nozzle tube 2 and as an electrode stand, and a portion thereof surrounds the tip of the nozzle head 26 to form an outflow space of the sub-flow path 28b. Further, the outside of the insulating tube 31 is covered with a crater cover 33 made of a conductive metal.

This crater cover 33 has a discharge electrode 32 that also serves as a locking member on the inside, and this discharge electrode 32 is fitted to the tip edge of the insulating tube 31, and a nut 34 is attached to the rear side of the stepped portion on the outside of the insulating tube. It is fixed to the insulating cylinder 31 by screwing it.

Further, a lead wire 37 of a piezoelectric igniter 36 provided on the side of the burner body 1 is connected to the rear inner side of the nozzle cover 33 as shown in FIG.

The lead wire 37 is connected to the gap formed between the insulating cylinder 31 and the crater cover 33.
Insert the tip of the wire and attach the tip of the wire to the crater cover 33.
I'm going to make contact with it.

The piezoelectric igniter 36 has a fixed member 38 containing a piezoelectric element and an impact spring, similar to those used in gas lighters, and is fitted into the fixed member, and is constantly activated by the impact spring. It consists of a movable member 39 that is pressed outward and is housed inside a casing 40 that is integrally formed on the side of the burner body 1.

Further, an operator 41 that slides inside the casing is attached to the movable member 39.
A housing groove 42 for the lead wire 37 is formed inside the housing.

The valve device 3 covers a cylinder 45 screwed into the rear of the burner body 1, a needle valve 46 inserted into the cylinder, and a stopper member 47 integrated with the needle valve and screwed onto the rear end of the cylinder 45. It is composed of a valve operator 48.

Inside the tip of the cylinder 45 is a main body side flow path 49.
The tip 46a of the needle valve 46 is inserted into a cylinder formed in a valve seat 50 communicating with the valve seat 50 and rotatably screwed into the valve seat 50.

In the above structure, liquefied gas is ejected from the injection nozzle 24 into the flow path 28 of the nozzle pipe 2. This liquefied gas becomes a mixed gas with air and flows out to the tip of the nozzle pipe. At the nozzle head 26, it is divided into a main stream and a side stream.

In such a state, when the piezoelectric ignition device 36 is operated to generate discharge sparks between the discharge electrode 32 and the ring member 29, the mixed gas flowing out from the sub-flow path 28b is first combusted, and by this combustion, ,
The mixed gas from the main flow path 28a is then combusted.

This combustion heats the insulating tube side, but since the insulating tube 31 made of ceramic has low thermal conductivity, the combustion heat is not transferred to the nozzle tube 2, and heating of the nozzle tube 2 is prevented.

[Effects of the invention] As described above, this invention consists of fitting an insulating tube 31 made of ceramic to the tip of the nozzle tube 2 to surround the tip of the nozzle tube, and covering the insulating tube 31 with a crater cover 33. Therefore, even if the combustion flame is made large, the insulating tube reduces the amount of heat transferred to the nozzle tube, thereby preventing the risk of overheating the nozzle tube.

In addition, since there are no large fluctuations in the temperature inside the nozzle tube, the liquefied gas is vaporized stably, and even if combustion continues for a long time, the mixing ratio with air will not be impaired, so it will always be stable. A combustion flame with a high temperature is obtained.

Furthermore, since the ceramic insulating tube is covered with a crater cover, the insulating tube will not be chipped even if the tip of the nozzle tube hits something else, and a discharge electrode can be installed inside the insulating tube as an electrode stand.
It has the characteristics that a proper discharge gap can always be maintained and that ignition does not deteriorate even when used for a long period of time.

[Brief explanation of the drawing]

The drawings show a burner device equipped with a crater according to this invention, with FIG. 1 being a longitudinal sectional side view and FIG. 2 being a partially sectional plan view. 1... Burner body, 2... Nozzle pipe, 3...
Valve device, 21... Nozzle base pipe, 22... Nozzle tip, 26... Nozzle head, 27... Vertical groove, 28... Channel, 28a... Main channel, 28b...
... Sub-channel, 31 ... Insulation tube, 32 ... Discharge electrode,
33... Crater cover.

Claims (1)

[Claims for Utility Model Registration] A burner body having a valve device in the rear part,
It consists of a nozzle pipe installed in the front part of the burner body and a piezoelectric igniter attached to the burner body side. A cylindrical nozzle head is fitted into the tip of the nozzle pipe to form a crater, and In a burner device in which a flow path in a nozzle pipe is divided into a main flow path and a sub flow path, an insulating tube made of ceramic is fitted to the tip of the nozzle tube to surround the tip of the nozzle tube, and the insulating tube is used as a crater cover. A crater for a burner device characterized by being coated with.