JPH0531402Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a Busen burner type that sucks air from the outside, mixes it, and ignites it using the negative pressure generated by the rapid flow of fuel gas. This burner nozzle for a gas lighter is designed to promote mixing of gas and air.

(Prior art) Conventionally, fuel gas from a fuel tank is ejected through a narrow nozzle hole to create a fast gas flow, and air is sucked in from the outside and mixed by the negative pressure generated around this gas flow. A Busen burner type gas lighter nozzle is known, in which the flow of the air-fuel mixture is disturbed to promote a mixed state, and then ignition is performed in the combustion chamber.
It is disclosed in the specification of No. 3844707, Japanese Utility Model Application Publication No. 61-69660, Japanese Patent Application Laid-Open No. 63-91431, etc.

Such a known Buzen burner nozzle type gas lighter nozzle is provided with a mixing chamber having a required length to promote mixing of air and gas sucked in under negative pressure, and the fuel flows through the mixing chamber. It is designed to mix gas and air. In order to achieve better mixing, attempts have also been made to provide a wall perpendicular to the flow direction at the outlet of the mixing chamber, and to make the air-fuel mixture turbulent by collision with the wall. However, even with these methods, it has not yet been possible to obtain a sufficient air-fuel mixture, and there is a risk that the ignition flame may fly or an unstable fuel state may occur.

In particular, when reducing the size of the burner nozzle in order to make the lighter smaller and increase the fuel tank capacity, the length of the mixing tube to form the mixture inevitably becomes insufficient, and sufficient mixing time is required. As a result, flames may fly and unstable combustion may occur.

(Problems to be solved by the invention) This invention can extend the mixing distance while reducing the size of the burner nozzle, and thus the mixing cylinder inside the burner nozzle, in the flow direction. The purpose is to provide a burner nozzle that enables the generation of

(Means for Solving the Problems) In order to solve the above problems, the means adopted by this invention is to eject fuel gas from a narrow nozzle hole at a faster flow rate, and to use the negative pressure generated around the gas flow to expel the fuel gas from outside. A mixture body with a plurality of spiral grooves formed on its circumferential surface is inserted and fixed into the upper part of the mixing chamber that sucks air from the air and mixes it, forming a spiral mixing passage, and the combustion tube is and a mixing chamber are connected to each other.

(Embodiments) Preferred embodiments of this invention will be described in detail below with reference to the drawings. FIG. 1 shows a burner nozzle for a Busen burner type gas lighter to which this invention is applied, and has a mixing cylinder 1 and a combustion cylinder 2 connected to the upper part of the mixing cylinder 1.

A gas introduction passage 3 connected to a combustion tank (not shown) is formed at the lower end of the mixing cylinder 1, and a filter 4 made of porous sintered metal is disposed at the upper end of the gas introduction passage 3. Contained foreign matter is removed. A nozzle plate 6 having narrow nozzle holes 5 is arranged above the filter 4, and the fuel gas flowing out from the fuel tank is spouted into the mixing chamber 7 at a high flow rate through the nozzle holes 5. . A primary air hole 8 is bored in the lower side wall of the mixing chamber 7,
Due to the negative pressure generated by the high-velocity gas flow ejected from the nozzle hole 5, primary air is sucked from the primary air hole 8 and mixed with the gas.

After the mixed fluid of fuel gas and primary air passes through a throttle hole 9 formed in the middle of the mixing cylinder 1, it flows into the wide mixing chamber 7. A secondary air hole 10 is bored in the lower part of the mixing chamber 7, and secondary air flows in from the outside and mixes with the air-fuel mixture flowing from below.

A plurality of spiral mixing passages 11 are defined in the upper portion of the mixing chamber 7, through which the primary and secondary particles that have risen in the mixing chamber 7 are mixed.
While the fuel gas mixed with the secondary air flows through this spiral mixing passage 11, sufficient mixing is achieved.

The mixing passage 11 is formed by a mixing body 12 that is inserted and fixed to the upper end of the mixing cylinder 1 . Mixture 12
As shown in FIGS. 4 to 6, it is a cylindrical body having an outer diameter that is approximately the same as the inner diameter of the upper part of the mixing cylinder 1, and a plurality of spiral grooves 13, four in the illustrated embodiment, are formed on the outer peripheral surface. , the lower surface is formed into a conical shape. A hole 14 for inserting a diffusion plate 15, which will be described later, is bored in the center of the top surface. When the mixture 12 is inserted into the upper part of the mixing cylinder 1, the spiral groove 13 is closed by the inner wall of the mixing cylinder 1, and a spiral mixing passage 11 is defined.

The diffusion plate 15 is a circular plate with a conical lower surface, and has a leg 16 erected at the center of the lower surface. They are connected and extend into the combustion tube 2.

A combustion cylinder 2 is connected to the upper part of the mixing cylinder 1 .
The diffusion plate 15 is located at the bottom of the combustion tube 2, and a discharge electrode 17 extends from the side of the approximately center, and a coil is provided at the upper end for making the combustion flame red-hot and improving combustion efficiency. A shaped catalyst 18 is disposed.

(Function) The fuel gas whose flow velocity has been increased by being throttled by the narrow nozzle hole 5 flows into the mixing chamber 7 while sucking air due to the negative pressure formed around it. The inflowing air-fuel mixture is sufficiently mixed while passing through a spiral mixing passage 11 formed in the upper part of the mixing chamber 7, and then flows out into the combustion cylinder 2. Then, in the combustion tube 2, diffusion occurs due to collision with the diffusion plate 15 and retention in the combustion tube 2, and the spark generated from the discharge electrode 17 is ignited. The ignited combustion flame burns out while being made red hot by the catalyst 18.

(Effects of the invention) According to this invention, since the mixture of fuel gas and air is mixed through the spiral mixing passage, a sufficiently long mixing distance can be obtained.
A good mixture can be formed. Therefore, the ignited combustion flame performs extremely stable combustion, and there is no risk of flying sparks or becoming unstable as in the conventional case. Moreover, even if the flame length is increased, a beautiful conical flame can be formed, and the commercial value can be improved.

In addition, since the spiral mixing path allows for a longer mixing distance, there is no risk of incomplete mixing even if the overall size of the burner is reduced, and the lighter can be made smaller while still maintaining sufficient tank space. It becomes possible to secure the following.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of the entire burner nozzle, Figure 2
The figure is an exploded perspective view, Figure 3 is a diagram showing the flow of air-fuel mixture, Figure 4 is a plan view of the mixture, Figure 5 is a side view of the same, Figure 6 is a bottom view of the same, and Figure 7 is a mixing tube. 8 is the same side view, FIG. 9 is the same side view, and FIG. 9 is the same side view.
FIG. 3 is a sectional view taken along line A'. 1...Mixing tube, 2...Combustion tube, 3...Gas introduction passage, 4...Filter, 5...Nozzle hole, 6...
...Nozzle plate, 7...Mixing chamber, 8...Primary air hole,
9... Throttle hole, 10... Secondary air hole, 11... Mixing passage, 12... Mixing body, 13... Spiral groove, 14
... Central hole, 15 ... Diffusion plate, 16 ... Legs, 17
...Discharge electrode, 18...Catalyst.

Claims (1)

[Scope of utility model registration request] Fuel gas is ejected from a narrow nozzle hole at an accelerated flow rate, and air is sucked in from the outside using the negative pressure generated around the gas flow. Multiple spiral grooves are formed on the circumferential surface of the upper part of the mixing chamber. A burner nozzle for a gas lighter, characterized in that a mixture is inserted and fixed to form a spiral mixing passage, and a combustion tube and a mixing chamber are communicated through the mixing passage.