JPH0350170B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improved structure of a mechanism for enabling ignition combustion of fuel gas ejected from a fuel tank and mixed with air in a gas lighter.

[Summary of the Invention] A gas lighter that jets fuel gas from a fuel tank and ignites it with a spark between high-voltage discharge electrodes. A diffuser that sucks the gas and promotes its mixing with air to increase combustion efficiency, then decelerates and diffuses the flow velocity of the gas, and further decelerates and diffuses the mixed gas with the air flowing out from this diffuser to ignite it. The gas lighter is provided with a combustion tube for making combustion possible, and the gas in the combustion tube is ignited by the discharge spark, thereby enhancing the ignition and combustion effects of the gas lighter.

[Prior Art] An example of a conventional high-pressure discharge ignition type gas lighter is shown in FIG. In the figure, a nozzle 35 is disposed inside the windshield wall 31, and this nozzle 35 communicates with the fuel tank 32 via a jet pipe 33. By pushing down the knob 43, a lever 44 is opened.
is rotated, and the gas whose ejection amount has been adjusted in advance to create a flame is ejected from the nozzle 35, and a discharge spark 40 from the discharge electrode 39 ignites the gas mixed with air. There is. However, gas lighters are made to a size that is not inconvenient to carry, so the ignition mechanism is also small, and the thermal energy of the high-voltage discharge spark that is generated is limited, making ignition unreliable. As a conventional example improved in this respect, the basic principle is shown in FIG. As shown by the dotted line arrow in the figure, by discharging the gas from the diversion hole 47 of the inner nozzle 45, the gas spouted around the spout of the outer nozzle 35 has a weakened flow velocity, so it can easily diffuse and interact with the air. Since it is easy to mix, the ignition efficiency is improved.The discharge spark 40 from the electrode 39 first ignites this gas flow part to create the armature 38. The flow velocity shown is fast, and the inner nozzle 45
The main flame 3 is ignited by igniting the main jet gas 42, which is difficult to ignite due to insufficient mixing with air around the nozzle hole.
I try to make 7.

On the other hand, there is a conventional gas burner as shown in FIG. 7 that has stable combustion efficiency and can produce a flame that is resistant to wind. In this type of gas burner, a long mixing pipe 51 suitable for sufficient mixing with air is connected to the tip of a nozzle 50, and this mixing pipe has an intake hole 52 opened on the side.
Air is sucked in by a strong jet of fuel gas from the nozzle 50, and is mixed with the fuel gas as it travels through the mixing tube 51 at a strong flow velocity.The air is focused while promoting mixing with the air. The main flame 53 is connected to the tip of the mixing tube 51.
Diversion fitting 5 for forming a sleeve 54 at the base of
5 is provided at the enlarged opening inside the upper end of the mixing tube 51, and includes a center hole 56 through which the above-mentioned mixed gas is jetted out at a high flow rate, and a center hole 54 for forming a flare 54 around the center hole 56. Side fire supply port 57
The flare 54 is regulated on the inner periphery of the flame tube 58 by the diverter metal fitting 55 and the flare supply port 57, and is created around the spout of the center hole 56, and has a flow velocity that is easy to ignite. controlled and decelerated. In addition, the gas ejected from the center hole 56, which becomes the main flame 53, has an extremely strong ejection flow velocity when used alone, so it is difficult to directly ignite the base of the gas, and it is also difficult to continuously burn the gas, so it is difficult to ignite the main flame 53. 54 is ignited and burned, thereby heating the main flame 53 and causing continuous combustion.

[Problems to be Solved by the Invention] Each of the above-mentioned conventional examples has the following problems.

First, in the conventional example shown in FIG. 5, in order to ignite and burn the mixed gas inside the windshield wall 31, the air necessary for this is taken in from the air around the air intake window 34 and the flame port 36. The window 34 needs to be large enough to mix air and fuel gas sufficiently according to the amount of gas ejected, and since the flame 37 formed by ignition combustion is created across the inside and outside of the flame port 36, Even the slightest breeze will quickly dissipate it.

As mentioned above, this type of gas lighter has a weak effect of forming a flame inside the windshield wall 31, and has the drawback that it is difficult to ignite if it is exposed to even a slight breeze, and the flame goes out during use. Furthermore, if the flame port 36 and the window 34 are too small, a flame cannot be created inside the windshield wall 31 and a flame is created only outside the flame port 36, making the flame even weaker against wind. . Moreover, as explained in the conventional example shown in FIG. 6, ignition cannot be achieved unless the side flame 38 is created under appropriate ignition conditions, and if the outside air temperature during use is too low, ignition becomes unstable. There is.

As described above, since conventional gas lighters create a combustion flame by mixing the gas ejected to the outside of the nozzle 35 with the surrounding air, it is necessary to ensure ignition and maintain the flame condition stably. It is difficult to set the flame to light, and the firepower is weak, and the flame protrudes to the outside of the windshield wall, making it easily affected by the wind, making ignition unstable, and being weak in the wind and easily extinguished.
It was difficult to use it outdoors.

On the other hand, the conventional gas burner shown in Figure 7 is relatively resistant to wind and can produce a stable and strong flame, but its original purpose is for melting metals and glass, welding metals, etc. It is used for use, and is advantageous in producing a large amount of heat at high temperatures, but the flame jet force is strong and the flame can only be made for a long time, so it protrudes far outside the flame nozzle and generates too much heat. It is dangerous and unsuitable for use in gas lighters for smoking, which produce sufficient heat with a small amount of heat. In addition, it is possible to continue the combustion of the main flame by creating side-lighting gas around the ejected gas that becomes the main flame and igniting it, but it consumes a lot of fuel, is uneconomical, and requires a large tank. Since it requires a long mixing tube, it is bulky and inconvenient to carry.

Therefore, the purpose of the present invention is to maintain most of the flame within the combustion tube without causing the flame to protrude outward, to be strong against wind, easy to ignite, to obtain appropriate thermal power with a small amount of fuel gas, and to be safe. To provide a gas lighter that is small and convenient to carry.

[Means for Solving the Problems] The gas lighter of the present invention has been made to achieve the above object, and its characteristic configuration is to increase the flow velocity of the fuel gas ejected from the fuel tank and increase the flow rate of the fuel gas into the mixing tube. A diffuser connected to the mixing pipe is connected to the mixing tube to promote mixing with air taken in from the intake hole, and to diffuse and decelerate the mixed gas flowing out from the diffuser. The combustion cylinder is equipped with a combustion tube for making ignition combustion possible.

[Function] The gas lighter of the present invention ejects fuel gas from a small-diameter nozzle at high speed and thinly in order to increase the ejection flow velocity.The flow velocity creates a negative pressure state in the atmosphere, and the air is discharged through the intake hole of the mixing pipe. Sufficient amount of gas is drawn in to create a gas mixture suitable for ignition. Then, the fuel gas and air are rapidly mixed in the mixing tube, introduced into the diffusion chamber, diffused by the diffuser, and guided into the combustion cylinder while controlling the flow rate. Furthermore, by colliding with the inner wall of the combustion cylinder and controlling the diffusion and flow velocity, a gas whose flow velocity has been weakened to a state where ignition and combustion are possible is created in the combustion cylinder, and ignition and combustion by discharge sparks occur inside the combustion cylinder. In addition, there is no need for the flame to protrude significantly outside the combustion tube, and there is no need to provide air intake holes for combustion from the outer wall of the combustion tube, and most of the flame is generated inside the combustion tube. Because it is extremely resistant to wind, it can be ignited even with the thermal energy of a small discharge spark.

[Embodiments of the Invention] Hereinafter, an embodiment of the gas lighter according to the present invention will be described in detail with reference to FIGS. 1 to 4. As shown in the figure, the gas lighter of this embodiment has a case 1, and a combustion tank 2 is provided in the lower part of the case 1. A gas ejection passage opening/closing valve 3 is erected upward from the bottom side of the combustion tube tank 2. In this gas ejection passage opening/closing valve 3, a valve body 6 opens and closes a valve hole 5 formed in a valve seat 4, and the amount of gas ejected from the valve hole 5 is adjusted in advance to an appropriate amount to create a combustion flame. The fuel gas passing through the valve hole 5 supports the valve body 6 and moves up and down so that it is ejected from the ejection pipe 7. There is a tube 8 at the tip of the fuel gas jet pipe 7.
A mixing tube 9 is connected via the. A filter 10 is provided at the inlet of the mixing tube 9, and a nozzle plate 11 is provided at the tip thereof. This nozzle plate 1
A fine nozzle hole 12 is opened in the nozzle hole 1 to further increase the flow velocity of the ejected gas.
2, the fuel gas is ejected with a small diameter and at a high flow rate. A mixing passage 13 is formed inside the mixing tube 9, which is a passage for gas ejected from the nozzle hole 12, and this mixing passage 13 has an intake hole 1.
4 is provided in the middle, and as the flow rate of the fuel gas increases, air is sufficiently sucked in from the intake hole 14 to create a mixed gas suitable for combustion.

A diffuser 15 is attached to the tip of the mixing tube 9, and a diffusion chamber 29 communicating with the mixing path 13 of the mixing tube 9 is provided inside thereof. Diffuser 15 of this embodiment
A conical body 17 is provided at the tip of the cylindrical body 16 to protrude downward, and a diffusion hole 18 of an appropriate size is bored in a cross shape across the conical body 17 on the distal end side of the cylindrical body 16. It has a similar structure.

The tip 30 of the mixing tube 9 surrounds the diffuser 15;
The base of the combustion tube 19 is fitted.

A distal end of a discharge electrode 20 protrudes at a substantially intermediate position inside the combustion tube 19 . The discharge electrode 20 is arranged so that a high voltage is supplied from a high voltage power generation mechanism 21 . The high voltage power generation mechanism 21 is operated by the operator 2
Power generation can be performed by pressing 2. When the operator 22 is pressed down, the operating lever 23 is operated to lift the nozzle 7 of the channel opening/closing valve 3 and start spouting fuel gas.

A cap 24 is placed on the upper end of the case 1,
The cap 24 can be opened and closed by rotating around a pivot shaft 25.

The tube 8, the mixing tube 9, and the combustion cylinder 19 are surrounded by a heat insulating gap 27, and the gap 27 has a large number of air holes 26 opened in the case 1.
Allows outside air to be introduced.

In such a gas lighter, when the cap 24 is opened and the operator 22 is pressed down, the operating lever 23 is pushed, and the rotation of the operating lever 23 about the fulcrum 23A opens the fuel gas ejection pipe of the flow path opening/closing valve 3. 7 is lifted, the valve body 6 is raised and separated from the valve seat 4, and fuel gas is ejected from the fuel gas ejection pipe 7. This fuel gas passes through the tube 8, passes through the filter 10, and is ejected as a rapid stream from the nozzle hole 12 of the nozzle plate 11 into the mixing pipe 9 and the mixing passage 13 of the same 30. This rapid flow of fuel gas creates a negative pressure around the ejected gas, and air is sucked in from the intake hole 14. Intake hole 14
The air is rapidly mixed with the fuel gas from the nozzle hole 12 in the mixing pipe 9, and is injected into the diffusion chamber 29 from the mixing path 13 while being mixed and diffused radially, and the tapered surface of the conical body 17 of the diffuser 15. The fuel collides with the inner wall of the combustion tube 19 and is further decelerated and diffused, reducing the flow velocity and allowing ignition and combustion. It becomes a mixed gas.

At this point, the operator 22 is pressed down to generate high voltage from the high voltage generation mechanism 21, and between the inner wall of the combustion tube 19 which also serves as the power receiving electrode from the discharge electrode 20 or the tip of the diffuser 15. A discharge spark is created and the mixed gas in the combustion tube 19 is ignited. In this case, the fuel gas injected into the combustion tube 19 has already been mixed with sufficient air for combustion, so that complete combustion takes place within the combustion tube 19 with a bluish-white flame.

In the above embodiment, since the gas combusted in the combustion tube 19 is a blue-white flame of complete combustion, it may be difficult to confirm the presence or absence of combustion when used outdoors in broad daylight. In order to
8 is provided. Since this net 28 is heated by the flame in the combustion tube 19 and becomes red-hot, combustion of the gas can be easily confirmed even outdoors. The net 28 may be made of any heat-resistant thin wire, such as ceramic, in addition to nichrome wire. Furthermore, it is clear that the means for confirming combustion is not limited to the shaped mesh 28 of the embodiment.

Furthermore, the ignition means is not limited to the high-voltage power generation mechanism, but may be of any type as long as it can generate an appropriate ignition spark, and the fuel tank, its gas injection valve mechanism, gas injection mechanism, etc. Although not shown in the example, any structure may be used as long as it is compatible with the diffuser and combustion tube that are the subject matter of the present invention.

[Effects of the Invention] As explained above, in the present invention, a small-diameter nozzle is provided to increase the jetting flow velocity of fuel gas, and air is sucked into the passage of the gas jetted from the nozzle at that flow rate and under negative pressure, and the mixing tube is The mixed gas is rapidly mixed with air in the diffusion chamber until it is sufficient for ignition and combustion, and then the mixed gas is decelerated and diffused in the diffuser and combustion cylinder, allowing for ignition and combustion inside the combustion cylinder. Since most of the flame produced by the gas ejected from a conventional gas lighter does not need to protrude into the atmosphere, it can be burned and ignited without being affected by wind, so it can be used outdoors. Reliable ignition and combustion can be performed, and complete combustion can be achieved within the combustion tube with a short flame, resulting in low fuel consumption and high safety, and there is no need to create a side flame to ignite as in the conventional method. Moreover, it does not require a long mixing tube for mixing with air and slowing it down, and it is compact, so it has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a gas lighter according to the present invention, and FIGS. 2 to 4 show the state of connection with the mixing tube, diffuser, and combustion tube used in the above embodiment, respectively. A plan view, a vertical cross-sectional view, and a side view; FIG. 5 is a partial cross-sectional view of an example of a conventional gas lighter;
Figure 6 shows nozzle 3 in the gas lighter shown in Figure 5.
5 and discharge electrode 39 and discharge electrode 39 and discharge spark 4
FIG. 7 is a partially enlarged cross-sectional view showing the relationship of zero, and FIG. 7 is a partial cross-sectional view of a conventional gas burner using a long mixing tube. DESCRIPTION OF SYMBOLS 1... Case, 2... Fuel tank, 3... Gas ejection path opening/closing valve, 7... Fuel gas ejection pipe, 8... Tube, 9... Mixing pipe, 11... Nozzle plate, 12
... Nozzle hole, 13 ... Mixing path, 14 ... Intake hole, 15 ... Diffuser, 16 ... Cylindrical body, 17 ... Cone, 18 ... Diffusion hole, 19 ... Combustion cylinder, 20 ...
...discharge terminal, 28...net, 29...diffusion chamber.

Claims (1)

[Claims] 1. A fuel tank filled with fuel gas, an on-off valve that spouts an appropriate amount of gas to create a combustion flame from the tank in response to an ignition operation, and a fuel tank filled with fuel gas. A nozzle plate is provided with a nozzle hole for creating negative pressure by ejecting fuel gas at a higher flow rate, and an intake hole is formed for sucking air by this negative pressure. A mixing tube having an inner diameter larger than the nozzle hole to promote mixing of fuel gas and air, a diffuser connected to the mixing tube to slow down and diffuse the flow rate of the mixed gas, and the diffuser. is a cylindrical body with an inner diameter larger than the mixing tube, a conical body provided downward at the tip of the cylindrical body, and a diffusion hole having a cross-shaped window across the conical body on the tip side of the cylindrical body. and a combustion tube connected to the diffuser for further decelerating and diffusing the gas mixed with air by the diffuser to create a gas mixture with air at a flow velocity sufficient for ignition and combustion. , and ignition means for igniting the combustible gas in the combustion cylinder. 2. The gas lighter according to claim 1, wherein at least a spark generating portion of the ignition means is provided within the combustion cylinder. 3. Means for confirming combustion is provided by providing a member that becomes red-hot due to the heat of combustion of the gas in the combustion cylinder at the opening of the combustion cylinder, and the spark generating part is provided below the member. A gas lighter according to claim 2.