JPH0435719Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a nozzle for a smoking lighter, in particular, generates a high-speed gas flow to suck in air, thoroughly mix fuel gas and air, and achieve complete combustion. Regarding nozzles for smoking lighters.

(Problems to be solved by conventional technology and ideas) Conventional smoking lighters generally have a structure in which fuel gas discharged from a gas tank or gas cylinder is directly combusted, resulting in incomplete combustion of the combustion flame, resulting in poor efficiency. However, it had the disadvantage of consuming a large amount of fuel gas. In addition, the ignition method uses springs, knurling, etc. to create a sub-gas (dilute gas) and ignites it, but the drawback is that mis-ignition occurs due to large variations in air mixture, resulting in a poor ignition rate. There is.

In view of the above points, it is an object of the present invention to provide a nozzle for a smoking lighter that is easy to ignite and completely burns the combustion flame, thereby significantly improving efficiency.

(Means for Solving the Problem) In order to achieve the above object, the present invention forms a nozzle throat portion with a diameter of 40μ to 500μ in the through gas flow path inside the cylindrical member, and forms a nozzle throat portion on the upstream side of the nozzle throat portion. The inner portion of the cylindrical member is used as a fuel gas reservoir, a mixing chamber is provided inside the cylindrical member at a downstream position adjacent to the nozzle throat portion, an air intake hole with a diameter of 1 mm to 3 mm is formed in the side wall of the mixing chamber, and the The inner side of the cylindrical member on the downstream side of the mixing chamber is formed into a mixture blowing passage having a diameter smaller than that of the mixing chamber, and an opening having a larger diameter than the mixture blowing passage is formed at the downstream end of the mixture blowing passage. However, another air intake hole or groove is formed in the large diameter opening.

(Function) The smoking lighter nozzle of the present invention injects a high-speed fuel gas flow into the mixing chamber from the nozzle throat.
Using this gas flow to create a reduced pressure state, air is taken in from the air intake hole to generate a mixture of fuel gas and air that is sufficiently mixed in the mixing chamber, which has a small diameter on the downstream side. The air-fuel mixture is blown out from a large-diameter air-fuel mixture diffusion opening through the air-fuel mixture blowing passage. At that time, since another air intake hole or groove is formed in the opening, air is further mixed in here,
The mixture ratio of combustion gas and air is optimized. As a result, the ignitability is extremely good,
And ideal complete combustion can be achieved.

(Example) Hereinafter, an example of the nozzle for a smoking lighter according to the present invention will be described with reference to the drawings.

FIG. 1 shows a reference example that is the basis of the present invention. In this figure, the smoking lighter nozzle is composed of a first cylindrical member 1, a second cylindrical member 2, and a third cylindrical member 3. A supply port 5 of a gas cylinder (or gas tank) 4 is connected to the third cylindrical member 3 . The gas cylinder 4 is a general type that spouts fuel gas from a supply port 5 by operating an operating section 6 thereof. The upper end of the third cylindrical member 3 is a male screw, and the male screw is screwed into a female screw formed inside the lower end of the second cylindrical member 2. The middle portion of the second cylindrical member 2 is a gas reservoir 7 with a slightly larger inner diameter, and a nozzle throat portion 8 for ejecting fuel gas at high speed is formed at the upper end of the gas reservoir 7. The outer peripheral surface of the upper end of the second cylindrical member 2 has a male thread, and is screwed into the female thread of the inner peripheral surface of the lower end of the first cylindrical member 1. At the lower part of the first cylindrical member 1, that is, at the downstream position adjacent to the nozzle throat portion 8, there is a mixing chamber 9 with an increased inner diameter.
is formed, and an air intake hole 10 is formed in the side wall portion of this mixing chamber. A mixture blowing passage 11 having a slightly smaller diameter than the mixing chamber 9 is formed in the center of the first cylindrical member 1 . Furthermore, an opening recess 12 is formed at the opening at the upper end of the air-fuel mixture blowing passage 11 .

Note that the outer diameter A of the first, second, and third cylindrical members is 4.
mm to 10 mm, the inner diameter B of the opening recess 12 is about 4 to 9 mm, which is about 1 mm smaller than that, and the inner diameter C of the air-fuel mixture blowing passage 11 is about 2 to 3 mm. Hole diameter D is 40μ to 500μ
The length E of the nozzle throat portion 8 is
The hole diameter F of the air intake hole 10 is approximately 200μ.
is about 1 mm to 3 mm.

If the hole diameter D of the nozzle throat portion 8 is smaller than 40μ, the amount of fuel gas ejected will be insufficient and machining will also become troublesome. If the hole diameter D is larger than 500 μm, it is not preferable because the jetting speed of the fuel gas decreases and the air mixing ratio decreases. If the hole diameter F of the air intake hole is smaller than 1 mm, the amount of air intake will be insufficient, and the hole diameter F3
Even if it is made larger than mm, the air intake amount will not increase and the function of the mixing chamber 9 will be impaired.

Further, the first cylindrical member 1, the second cylindrical member 2, and the third cylindrical member 3 may be connected and integrated by means such as press fitting or caulking instead of screws.

In the above configuration, the fuel gas discharged from the gas cylinder (or gas tank) 4 accumulates in the gas reservoir 7 under sufficient pressure, and is ejected as a high-speed gas flow from the extremely narrow nozzle throat portion 8, with the downstream side having a somewhat smaller diameter. The inside of the narrowed mixing chamber 9 is brought into a reduced pressure state by the high-speed gas flow, and air is taken into the mixing chamber through the air intake hole 10, where a sufficiently mixed air-fuel mixture is generated. Then, the air-fuel mixture passes through a somewhat small-diameter air-fuel mixture blowing passage 11 at a predetermined flow velocity and reaches a large-diameter opening recess 12 for air-fuel mixture diffusion.
This large-diameter opening recess 12 serves to diffuse the air-fuel mixture over an appropriate range to form a flame with an appropriate spread, and to reduce the blowing speed of the air-fuel mixture to a level that facilitates ignition. At this time, it is preferable from the viewpoint of ease of ignition that air is mixed with the fuel gas 1 at a volume ratio of about 100.
The air-fuel mixture containing a large amount of air can be ignited in the opening recess 12 by, for example, causing a spark discharge between the electrode and the first cylindrical member 1 using a piezoelectric ignition unit.

Now, in the case of the above reference example, it is possible to considerably increase the mixing ratio of air to fuel gas, but since the air mixing step is only one step in the mixing chamber 9, there is a limit to the increase in the air mixing ratio. Ta.

In the present invention, as described in the following examples, the air mixing process is made into two steps, and the mixing ratio of air to fuel gas is further increased to obtain an ideal complete combustion flame.

2A and 2B show a first embodiment of the present invention. In this figure, in the first cylindrical member 1B, a large-diameter cylindrical portion 22 is integrated with the distal end side of a small-diameter tubular portion 21 whose inner side forms a mixture blowing passage 11 having a diameter smaller than that of the mixing chamber 9. This large-diameter cylindrical portion 22 forms an opening for air-fuel mixture diffusion that has a larger diameter than the air-fuel mixture blowing passage 11 . Further, an air intake hole 23 is formed at the bottom of the large diameter cylindrical portion 22. Note that 10 is an air intake hole, and the configurations of the second and third cylindrical members are the same as in the reference example.

According to this first embodiment, since the air intake hole 23 is further formed downstream of the air intake hole 10,
The air mixing process is two steps, and a sufficient amount of air close to the ideal can be mixed with the fuel gas. Therefore, by causing a spark discharge between the electrode and the first cylindrical member 1B using, for example, a piezoelectric ignition unit in the large diameter cylindrical member 22,
Can be ignited extremely easily. In this case, no special parts are required for ignition, the structure can be simplified, and the voltage of the piezoelectric ignition unit may be relatively low in order to ignite a complete mixture. For example, it can be ignited well at about 6kV to 7kV.

3A and 3B show a second embodiment of the present invention. In this figure, the first cylindrical member 1C has a large diameter that forms a large-diameter opening for air-fuel mixture diffusion on the tip side of a small-diameter tubular portion 21 whose inner side forms an air-fuel mixture blowing passage 11 with a diameter smaller than that of the mixing chamber 9. The cylindrical portion 24 is integrated, and a slit-shaped air intake groove 2 is formed on the outer wall of the cylindrical portion 24.
5 is formed. Note that 10 is an air intake hole, and the configurations of the second and third cylindrical members are the same as in the reference example.

According to this second embodiment, since the air intake groove 25 is further formed downstream of the air intake hole 10,
The air mixing process is two steps, and a sufficient amount of air close to the ideal can be mixed with the fuel gas.

(Effects of the invention) As explained above, according to the smoking lighter nozzle of the invention, there is a mixing chamber at the downstream position adjacent to the nozzle throat portion and a large diameter opening located at the downstream end of the air-fuel mixture blowing passage. The air mixing operation can be performed at two locations, and the mixing ratio of air to fuel gas can be made ideal. Therefore, the ignitability is extremely good and it is possible to make the combustion flame an ideal complete combustion flame. For this reason, fuel gas consumption is low, and fuel consumption can be reduced to about 1/5 or more compared to conventional systems that use incompletely combusted flames.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a reference example that is the basis of the present invention, FIG. 2 A is a partial cross-sectional view showing a first embodiment of the nozzle for a smoking lighter according to the present invention, and FIG. FIG. 3A is a partial sectional view showing a second embodiment of the present invention, and FIG. 3B is a plan view thereof. 1, 1B, 1C...first cylindrical member, 2...second
Cylindrical member, 3... Third cylindrical member, 4... Gas cylinder, 7... Gas reservoir, 8... Nozzle throat section, 9... Mixing chamber, 10, 23... Air intake hole,
11... Air-fuel mixture blowing passage, 12... Opening recess, 2
5...Air intake groove.

Claims (1)

[Scope of utility model registration request] The gas flow path inside the cylindrical member has a diameter of 40 μm or more.
A nozzle throat portion of 500 μm is formed, an inner portion of the cylindrical member on the upstream side of the nozzle throat portion is used as a fuel gas reservoir, and a mixing chamber 9 is provided inside the cylindrical member at a downstream position adjacent to the nozzle throat portion. An air intake hole 10 with a diameter of 1 mm to 3 mm is formed in the side wall of the mixing chamber, and the inside of the cylindrical member on the downstream side of the mixing chamber 9 is made into a mixture blowing passage 11 having a diameter smaller than that of the mixing chamber. A smoking lighter characterized in that an opening having a larger diameter than the flow path 11 is formed at the downstream end of the air-fuel mixture blowing flow path 11, and another air intake hole or groove is formed in the large diameter opening. Nozzle for.