JPH10227457A - Combustion device for liquid fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly eliminate a difference between internal and external pressures of a fuel tank by providing an air path at a portion except for a fuel path through a wick to make a communication between the inside of the fuel tank and the outside air at least during the combustion period. SOLUTION: When combustion is started with an ignition caused at the tip of a combustion wick 6 by an ignition member 10, a liquid fuel is supplied to a combustion section 61 from a suction part 62 by a fuel path through a combustion wick 6 corresponding to a fuel consumption at the combustion section 61 associated with the combustion. Then, the liquid fuel in a fuel tank 2 is gradually sucked up and the reduced capacity of the liquid fuel within the fuel tank 2 causes an internal pressure to lower, which tends to block the suction of the fuel. But an air path 20 is opened to let air outside flows in through the air path 20 according to a pressure difference. The elimination of the pressure difference allows quick supply of the fuel to the combustion section 21 without being blocked. This stabilizes the length of a combustion flame being balanced early from the initial start of the combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a liquid fuel combustion device such as a lighter having a wick for sucking and burning liquid fuel using alcohol fuel or the like.

In particular, the present invention relates to a lighter for smoking equipment, an igniter such as a torch and a lantern, and a burning apparatus such as a lighting apparatus, which uses a liquid fuel such as alcohols, benzene-based hydrocarbons and petroleum-based hydrocarbons. The present invention relates to a configuration around the core for obtaining a desired combustion state.

[0003]

2. Description of the Related Art In general, as fuels for burning appliances such as lighters for smoking articles, igniters, torches, lighting equipment, etc., alcohol fuels such as ethyl alcohol, petroleum benzene-based benzene fuels, and liquefied gases such as butane gas and propane gas are used. Fuel is being used.

[0004] The performance, ease of use, and design structure of each burner differ depending on the type of fuel used, and each burner has its own characteristics. For example, in the case of liquefied gas fuel, the gas pressure is high in the operating temperature range of the combustion equipment, and the container for storing the fuel needs to have a pressure-resistant structure. Further, the flame length changes in accordance with the fluctuation of the gas pressure. In particular, there is a characteristic that the gas pressure greatly varies logarithmically with the temperature, and there is a problem that the flame length greatly changes with the temperature. In order to reduce the change in the flame length, special design measures for correcting the temperature of the fuel supply mechanism of the combustion appliance are required, which makes the structure complicated and disadvantageous in cost.

On the other hand, liquid fuels such as alcohol fuels are liquid at room temperature, have relatively low vapor pressure, do not require a pressure-resistant container for a fuel storage unit, and have advantages in terms of simplification of the structure of combustion equipment and cost. Become. Also, in this liquid fuel combustion device,
As a means for supplying the liquid fuel from the fuel storage unit to the combustion unit, generally, using the surface tension of the liquid fuel,
A wick is used that draws up continuous pores or slits formed by bundling fine fibers by capillary action and burns at the tip.

[0006] Specifically, the above-mentioned wick is made of a cord-like twisted fiber, a bundle of glass fibers, and the like for sucking up fuel.
Or wrap glass fiber with cotton yarn using both,
Utilizing, for example, a metal wire woven so that it cannot be unraveled, the lower end wicking portion functions as fuel wicking and the upper end combustion portion burns.

[0007]

However, in a combustion apparatus using a wick as described above, the liquid fuel leaks through the wick due to the difference between the internal pressure and the external pressure of the fuel tank containing the liquid fuel. Or there is a problem that an external air suction phenomenon occurs.

Specifically, when a liquid fuel such as alcohol is sucked from a fuel tank by a combustion wick and burned,
When the liquid fuel is ignited and burned by the combustion wick, the liquid fuel is consumed in the leading end combustion portion of the combustion wick, and the liquid fuel is sucked up from the fuel tank and supplied to the combustion portion for maintaining the combustion. The flame length of the combustion flame changes until the consumption amount of the liquid fuel in the combustion portion and the suction supply amount from the fuel tank are balanced.

In the case where the burning appliance is an igniter such as a lighter, it is preferable that the flame length be stabilized as quickly as possible after ignition. In this case, it is preferable that the wicking portion of the combustion wick has the highest wicking ability of the liquid fuel as much as possible. At the same time, the inside of the fuel tank is decompressed with the outflow of the liquid fuel, and the wicking portion of the combustion wick passes through the wicking portion. It is necessary to consider that there is no pressure difference between the fuel tank and the outside air so that the pressure increase is not hindered by the pressure reduction.

On the other hand, in order to prevent the stored liquid fuel from leaking to the outside through the fuel passage formed by the combustion wick due to an increase in the pressure in the fuel tank, particularly in a portable igniter or the like, It is also necessary to take care not to cause leakage of the liquid fuel.

As described above, in the combustion apparatus for liquid fuel, the internal pressure and the external pressure of the fuel tank are reduced due to a decrease in fuel accompanying the use as described above or a change in ambient temperature or ambient pressure. When the internal pressure of the fuel tank is high, the liquid fuel leaks through the combustion wick, or when the internal pressure of the fuel tank is low, the outside air is sucked through the combustion wick and ignition failure occurs. This may cause a problem in use.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid fuel combustion apparatus which can quickly eliminate a difference between an internal pressure and an external pressure of a fuel tank.

[0013]

According to the present invention, there is provided a liquid fuel combustor having a wick for sucking and burning liquid fuel contained in a fuel tank by capillary action, and a portion other than the fuel passage formed by the wick. In addition, a ventilation path for communicating the inside of the fuel tank with the outside air at least at the time of combustion is provided.

Further, another burning apparatus for liquid fuel of the present invention includes a wick for sucking and burning the liquid fuel contained in the fuel tank by capillary action, dividing the wick, and at least one of the divided portions with respect to the other. A fuel passage provided by the wick so that the fuel supply is supplied from one side to the other at the time of contact, and the fuel supply is cut off with the separation to limit the combustion time. At least the other portion is provided with a ventilation path for communicating the inside of the fuel tank with the outside air at least during combustion.

On the other hand, in the apparatus having a volatilization-preventing closing cap for opening and closing the burning part of the wick so as to be openable and closable, the opening of the air passage to the outside air is provided in the closed space of the closing cap in a closed state. Preferably, it is formed to be in communication or to be closed at the closed end of the closure cap in the closed state.

[0016] Further, a ventilation passage closing portion attached to or interlocked with the closing cap is provided so as to open and close the opening of the ventilation passage to the outside air at the same time as opening and closing the burning portion of the wick by operation of the closing cap. It is also possible.

The air passage can be constituted by a gap between the core holder and the groove formed on the inner periphery of the core, and a pore formed along the core. It can be constituted by a pipe, and furthermore, can be constituted by a groove formed in a core.

Next, the disposable liquid fuel combustion device of the present invention has a fuel tank of a closed structure containing a fibrous material and impregnating and storing liquid fuel so that it cannot be re-injected. The wick inserted into contact with the fibrous material and sucks up the liquid fuel by capillary action, the other end of the wick protruding above the fuel tank held by the wick holder, and at least the flaming portion of the wick via a seal member An opening / closing closure cap, an ignition member disposed adjacent to the combustion portion of the wick and igniting the combustion portion, and allowing the inside and outside of the fuel tank to ventilate through portions other than the fuel passage by the wick. It is composed of a communicating air passage.

As the liquid fuel, an alcohol fuel, for example, a lower monohydric alcohol such as methyl alcohol, ethyl alcohol or propyl alcohol as a main component, to which a saturated hydrocarbon such as hexane or heptane for coloring a flame is mixed. Benzene, petroleum hydrocarbon and the like are used.

The core is formed of a different material for the combustion portion and the suction portion as in an embodiment described later, and the combustion portion and the suction portion are integrally formed of the same material. Things can also be used.

[0021]

According to the combustion device for liquid fuel of the present invention,
By providing an air passage for communicating the inside of the fuel tank with the outside air in a portion other than the fuel passage by the wick, a decrease in the pressure inside the fuel tank due to a decrease in the liquid fuel in the fuel tank causes the outside air to flow through the air passage. Thus, the pressure difference from the external pressure can be eliminated, so that, after the combustion portion of the wick is ignited, the liquid fuel contained in the wick is consumed by the combustion to remove the liquid fuel in the fuel tank. It is possible to quickly supply fuel from the suction portion that is not in a depressurized state through the fuel passage in the core, thereby improving the responsiveness of fuel supply and obtaining a stable combustion state early after ignition.

Also, in the case where the wick is divided and provided so as to limit the combustion time, similarly, by providing a ventilation passage for communicating the inside of the fuel tank with the outside air in a portion other than the fuel passage by the wick, The pressure difference between the fuel tank internal pressure and the external pressure can be quickly eliminated, and the function of limiting the combustion time can be reliably and stably obtained.

On the other hand, in the apparatus having a closing cap for preventing volatilization from the burning portion of the wick except during use, the opening of the ventilation path to the outside air is closed in the closed space of the closing cap in the closed state. Is formed to communicate with
It is formed so as to be closed at the closed end of the closed cap in the closed state, and is further provided with an air passage closed portion attached to or interlocked with the closed cap. When the closing cap is closed, the ventilation path is closed to prevent the liquid fuel from volatilizing, and when used with the closing cap open, the ventilation path is also opened to open and close the opening. An equilibrium effect between the tank internal pressure and the external pressure can be obtained.

Further, the air passage is formed in the fuel passage by the wick by a gap between the wick and the wick holder or a groove on the inner periphery of the wick holder, a pore pipe disposed along the wick, and a groove formed in the wick. With the juxtaposed arrangement, the pressure difference between the inside and outside of the fuel tank can be quickly eliminated by the above-mentioned ventilation path near the core in response to a change in the ambient temperature of the combustion appliance or a change in the ambient pressure. The leakage of liquid fuel and the inhalation of outside air can be reliably prevented, and the occurrence of malfunctions during use is eliminated.

Next, a disposable liquid fuel combustor has a hermetically sealed fuel tank containing a fibrous material and impregnating and storing the liquid fuel so that it cannot be re-injected, and one end inserted into the fuel tank to store the liquid fuel. A wick that sucks up and is burned at the other end that is held by the wick holder and protrudes above the fuel tank, a closing cap that opens and closes the burning portion of the wick via a seal member, and an ignition that ignites the burning portion of the wick By using a member and a ventilation path that connects the inside and the outside of the fuel tank, the use of liquid fuel basically simplifies the structure without the need for a pressure-resistant structure and a valve mechanism, and the temperature change It is possible to mass-produce disposable combustion appliances having stable combustion characteristics with little change in flame length at low cost.

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a combustion apparatus for liquid fuel according to an embodiment of the present invention.

<First Embodiment> FIG. 1 shows a schematic sectional structure of a disposable smoking lighter as an example of a combustion device for liquid fuel.

The lighter 1 has a bottomed cylindrical fuel tank 2, a fiber material 3 (filling) is inserted into the fuel tank 2, and an upper lid 4 is fixed to an upper part of the fuel tank 2. , The liquid fuel is stored in a sealed structure so as not to be re-injectable.

For example, the fuel tank 2 is a molded article made of polypropylene and has an inner volume of 5 cm ³ .
The fibrous material 3 is formed by pushing a polypropylene fiber having a thickness of 1 to 2 denier into the fuel tank 2 at a density of 0.1 g / cm ³ , and the fibrous material 3 contains 95 wt% of ethyl alcohol,
4 g of a liquid fuel mixed with 5 wt% of n-hexane is injected, impregnated and stored.

Further, a wick 6 (combustion wick) vertically penetrating the upper lid 4 into the fuel tank 2 and fixed by a wick holder 7.
Are arranged. The combustion wick 6 includes an upper combustion portion 61.
And a lower suction portion 62, which are formed of different materials, and in a state where the lower end portion of the combustion portion 61 and the upper end portion of the suction portion 62 are in contact with each other, they are joined by a metal cylindrical core holder 7. ing.

A joining screw 7 is provided on the outer periphery of the core holder 7.
a is provided in the screw hole 4 a of the upper lid 4 of the fuel tank 2,
It is screwed and fixed to the bottom via a seal ring 8.
Note that a top plate 9 is provided on the upper surface of the upper lid 4.

The lower end of the suction portion 62 of the combustion wick 6 comes into contact with the fiber material 3 in the fuel tank 2 and sucks up the liquid fuel impregnated in the fiber material 3 by capillary action. The combustion portion 61 of the wick 6 is ignited and generates a flame to burn.

The combustion section 61 is composed of a glass fiber bundle. For example, this glass fiber has a thickness of 6 μm, a fiber density (basis weight) of 150 mg / cm ³ , an outer diameter of 3 mm, and a length of 1 mm.
The lead having a length of 0 mm is inserted into the lead holder 7 so as to protrude from the tip of the lead holder 7 by a length of 3 mm.

The suction part 62 is formed by molding and sintering polyethylene powder into a rod shape having a large diameter head, and this head is inserted into the lower part of the core holder 7. The lower end of the wick holder 7 is caulked in this state while being in contact with the lower end of the
The combustion wick 6 is formed by combining and integrating the two.

For example, the suction part 62 is prepared by placing polyethylene powder having a mean particle size of 140 mesh and a mixture of particles of 70 to 200 mesh in a molding die.
Sintered at 0 ° C. for 10 minutes, and the outer diameter of the head 62a is 4.
2mm long 3mm, lower leg 4mm outside diameter, length 37
mm.

The fuel consumption, the shape of the flame, and the length of the flame of the combustion wick 6 are set according to the thickness, the number, and the length of the glass fibers of the combustion portion 61. On the other hand, in the suction portion 62, the manner of forming the internal voids varies depending on the thickness, the particle size of the sintered polyethylene powder, the sintering density, and the like, and the fuel suction and supply characteristics are set. In addition, the head of the suction portion 62 is formed to have a large diameter and a large volume,
It constitutes a fuel reservoir for holding liquid fuel, and the fuel reservoir can stabilize combustion.

An ignition member 10 is disposed on the upper lid 4 so as to face the tip of the combustion portion 61 of the combustion core 6.
Numeral 0 denotes a pyrotechnic stone 12 which is vertically movably inserted into a bracket 11 fixed to the upper lid 4, and a rotating file 13 is provided at an upper end of the bracket 11. The tip is provided in a structure pressed by the urging force of the stone pressing spring 14, and the rotating file 13 is provided.
Is provided so that the sparks fly toward the combustion wick 6 by the rotation operation of.

The combustion portion 61 of the combustion wick 6 is connected to the wick holder 7
A cover cap 16 for volatilization prevention is provided together with the protrusion of the fuel tank 2. The closure cap 16 is rotatably supported by a pin 17 at one end of the upper surface of the upper lid 4 in the fuel tank 2. . A closed space S having a concave shape is formed inside the closing cap 16, and a sealing member 18 is provided at a closed end portion to be pressed against the space.

In the structure of the lighter 1 as described above, an air passage 20 is formed through the upper cover 4 and the front plate 9 to make the inside of the fuel tank 2 communicate with the outside air. The opening on the outside air side of the ventilation path 20 is provided with the sealing member 1 of the closing cap 16 in a closed state.
8 and is provided so as to communicate with the enclosed space S inside. For example, the diameter of the ventilation path 20 is formed to be 0.5 mm to 2.0 mm.

When the closing cap 16 is opened by the opening of the ventilation path 20 as described above, the internal space of the fuel tank 2 communicates with the outside air. When the tip of the combustion wick 6 is ignited by the ignition member 10 to start combustion, the combustion wick 6 responds to the fuel consumption in the combustion section 61 accompanying the combustion.
The liquid fuel is supplied from the suction part 62 to the combustion part 61 by the fuel passage by the above, and the liquid fuel in the fuel tank 2 is sequentially sucked up. Along with this, the internal pressure decreases due to the reduction in the volume of the liquid fuel in the fuel tank 2, which hinders the suction of fuel. External air flows in through the ventilation path 20, and the pressure difference disappears, so that the combustion portion 61
The supply of fuel to the combustion flame is quickly performed without being hindered, and the flame lengths of the combustion flames are equilibrated and stabilized early from the beginning of the combustion start.

Even when the internal pressure of the fuel tank 2 becomes higher than the external pressure due to a rise in the temperature of the lighter 1 or a decrease in the outside air pressure, the internal air is released through the ventilation passage 20 and the combustion wick 6 The liquid fuel impregnated in the fuel does not leak from the combustion part 61. Conversely, even when the internal pressure of the fuel tank 2 becomes lower than the external pressure due to a decrease in the temperature of the lighter 1 or an increase in the outside air pressure, the outside air flows in through the ventilation path 20 and impregnates the combustion wick 6. The liquid fuel is pushed back by the inflow of the outside air, and the fuel shortage in the combustion section 61 does not occur.

When the closing cap 16 is closed, the outside opening of the ventilation passage 20 communicates with the closed space S, so that the volatilization of the liquid fuel through the ventilation passage 20 is prevented. Is suppressed.

Further, the lighter 1 according to the first embodiment
The result of an experiment in which the effect of forming the air passage 20 was confirmed by using the following will be described later.

<Second Embodiment> Lighter 1 of this example
As shown in FIG. 2, the combustion wick 6 has the same form as the previous example, and the relationship between the ventilation path 20 and the closing cap 16 is different.

The closing cap 16 of this embodiment has a wide sealing surface provided by a sealing member 19 at the closed end, and an outer opening of the ventilation path 20 formed by a perforation is formed opposite the sealing member 19. That is, the ventilation path 20 that communicates the inside of the fuel tank 2 with the outside air is provided so as to be opened and closed directly with the opening and closing operation of the closing cap 16.
Other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals and description thereof will be omitted.

In the case of this example, as compared with the first embodiment, the prevention of volatilization and leakage of the liquid fuel through the air passage 20 when the closing cap 16 is closed is more reliable, and the combustion stability characteristic is improved. Is similar to the previous example.

<Third Embodiment> FIG. 3 shows a main structure of a writer of this example. An air passage 21 that communicates the inside of the fuel tank 2 with the outside air is formed so as to penetrate the wick holder 7 attached to the outer periphery of the wick 6 in parallel with the wick 6.

An O-ring 31 for sealing is mounted on the outer periphery of the leading end of the core holder 7.
The inner peripheral surface of the closed end 16a is pressed against the O-ring 31 to seal the opening of the combustion portion 61 of the combustion wick 6 and the opening of the ventilation passage 21. In addition, the closing cap 1
The closed end 16a of 6 is formed on a slope to facilitate the fitting into the O-ring 31.

<Fourth Embodiment> FIG. 4 shows a main structure of a lighter of this example, and FIG. Ventilation passage 22 that connects the inside and outside of fuel tank 2
Is formed by cutting out the combustion wick 6 to form a groove-shaped space between the combustion wick 6 and the wick holder 7.

The combustion portion 63 of the combustion wick 6 in this example is
It is formed into a round bar shape by using a porous glass sintered body or a porous ceramic sintered body instead of glass fiber, contains open cells (capillary passages) inside, and has an upper end portion of a predetermined amount (for example, from the upper end portion of the core holder 7). 3 mm) It is mounted so as to protrude, and the size of the combustion flame is determined by setting the protruding amount, the diameter, and the like. For example, the combustion part 63 has an outer diameter of 3.0 mm and a length of 1 mm.
It is provided at 0 mm.

On the other hand, the suction part 62 whose tip part is in contact with the lower end part of the combustion part 63 is formed in a round bar shape from a porous material made of a sintered body of polyethylene powder in the same manner as described above. Then, the side edge of the suction portion 62 at a position below the core holder 7 from the tip end of the combustion part 63 is removed in a cross-sectionally oval shape, and an air passage is formed between the upper surface and the inner peripheral surface of the cylindrical core holder 7. 22 are formed, and their characteristics are the same as those of the above-described embodiment.

<Fifth Embodiment> FIG. 6 shows a main structure of a writer of this example, and FIG. 7 shows a BB section thereof. Ventilation passage 23 that connects the inside and outside of fuel tank 2
Is formed by the space between the combustion wick 6 and the wick holder 7.

Specifically, the upper part of the combustion part 61 and the upper part of the suction part 62 of the combustion wick 6 are provided in a circular cross section, whereas the inner hole 7b of the wick holder 7 is formed in a rectangular cross section.
A substantially triangular space is formed at the four corners between the two so as to penetrate in the up-down direction, and this space forms a ventilation path 23 for communicating the fuel tank 2 with the outside. Others are the same as the third embodiment.

<Sixth Embodiment> FIG. 8 shows a main structure of a lighter of this example, and FIG. Ventilation path 24 that connects the inside and outside of fuel tank 2
Is formed by a groove provided in the inner hole 71a of the core holder 71.

Specifically, a vertical groove extending in the axial direction and vertically penetrating the wick holder 71 is formed in a part of the inner peripheral portion of the inner hole 71a of the wick holder 71 for holding the wick 6. When the combustion wick 6 is inserted into the hole 71a, the ventilation path 24 is formed in parallel along the outer peripheral portion of the combustion wick 6. In addition,
The wick holder 71 has an eccentric inner hole 71a for holding the wick 6, and the ventilation path 24 is provided in a thick portion. Others are the same as the third embodiment.

<Seventh Embodiment> FIG. 10 shows a main structure of a writer of this example, and FIG. 11 shows a DD section thereof. Ventilation passage 2 that connects the inside and outside of fuel tank 2
5 is formed by a groove provided between the core holder 7 and the upper lid 4 of the fuel tank 2.

More specifically, a screw hole 4a is screwed into a joint screw 7a formed at the lower part of the outer periphery of a wick holder 7 holding a combustion wick 6 therein. A vertical groove is formed in a part of the inner periphery of the screw hole 4a so as to penetrate vertically, and the vertical groove forms an air passage 25 that communicates the fuel tank 2 with the outside. Others are the same as in the first embodiment.

<Eighth Embodiment> FIG. 12 shows the main structure of a writer of this example. The air passage 26 that connects the inside and the outside of the fuel tank 2 is formed by a vertical groove provided on the outer peripheral portion of the core holder 7.

Specifically, a vertical groove is formed in a part of the joining screw 7 a formed at the lower part of the outer periphery of the core holder 7, and the vertical groove is formed to have a length equal to or longer than the thickness of the upper lid 4 of the fuel tank 2. The air passage 26 communicates the inside and outside of the upper lid 4. Others are the same as the seventh embodiment.

<Ninth Embodiment> FIG. 13 shows the main structure of a writer of this example, and FIG. 14 shows its EE section. Ventilation passage 2 that connects the inside and outside of fuel tank 2
Reference numeral 7 is formed by a pore pipe installed in parallel with the combustion core 6.

More specifically, a pore pipe 32 extending in the axial direction parallel to the inner hole 71a of the wick holder 71 holding the combustion wick 6 is fitted. A path 27 is configured. The wick holder 71 has an eccentric inner hole 71a for holding the wick 6, and a ventilation path 27 is provided in a thick portion.
Others are the same as the third embodiment.

<Tenth Embodiment> FIG. 15 shows the essential structure of a lighter according to this embodiment, in which a combustion wick 6 is divided so as to perform quantitative combustion.

The combustion wick 6 has a part of the suction part 62 divided, and the upper suction part 62a is provided slidably in the vertical direction together with the combustion part 61 made of glass fiber.
Is moved toward and away from the upper end of the lower suction part 62b. That is, the combustion part 61 and the upper suction part 62a are held by the cylindrical core holder 72, and the core holder 72
Is vertically slidably supported in a sliding hole 4b of the upper lid 4 of the fuel tank 2, while the lower suction part 62b has an upper end fixed to the upper lid 4 and a lower part inserted into the fuel tank 2. . The upper suction part 62a is a fuel reservoir having a volume that holds a fuel amount necessary for obtaining combustion for a predetermined time in the combustion part 61.

The ventilation path 28 for communicating the inside of the fuel tank 2 with the outside air has a first ventilation path 28 a vertically penetrating the core holder 72 and a first ventilation path at the bottom of the sliding hole 4 b of the upper lid 4. It is formed by a second ventilation path 28b penetratingly formed in communication with the path 28a.

The lead holder 72 is inserted into the slide hole 4b via the seal ring 33, and is urged in the separating direction (upward) by the coil spring 34. The coil spring 34 is contracted between the upper surface of the upper lid 4 and the upper end of the core holder 72.
4 and the upper suction part 62a
Is moved upward, the lower end thereof is a lower suction portion 62.
It is provided so as to be separated from the upper end of b and to form a gap between them.

The sealing member 18 at the closed end of the closing cap 16 for opening and closing the combustion portion 61 of the combustion wick 6.
Abuts on the upper end of the wick holder 72 outside the opening of the first ventilation path 28a and pushes it down. When the closing cap 16 is closed, the cap abuts against the lead holder 72 and is pressed down against the spring 34 so that the lower end of the upper suction part 62a contacts the upper end of the lower suction part 62b, and the combustion is performed. Part 61 and ventilation path 2
8 so as to cover and hermetically prevent the liquid fuel from volatilizing.

In the state where the closing cap 16 is closed as described above, since the upper suction part 62a and the lower suction part 62b of the combustion wick 6 are in contact with each other, the liquid fuel is supplied to the combustion part 6.
1 to hold a predetermined amount of fuel. Subsequently, when the closing cap 16 is opened, the core holder 72 is opened.
The pressing force is released and the spring 34 moves upward to separate the contact with the lower suction part 62b, thereby cutting off the fuel supply.

When the combustion portion 61 is ignited and burned, the fuel held in the combustion portion 61 and the upper suction portion 62a is consumed by the combustion, and the combustion flame is automatically extinguished in a burned-out state. A quantitative combustion mechanism (automatic fire extinguishing mechanism) is provided. The characteristics associated with the formation of the air passage 28 are the same as those in the first embodiment.

In the above example, the upper suction part 62
a and the lower suction part 62b are in contact with each other by an inclined surface, so that the contact area is increased to increase the supply amount of the liquid fuel per unit time.

<Eleventh Embodiment> The main structure of the lighter of this example is shown in FIG.
This is an example in which fixed quantity combustion is performed in the same manner as in the embodiment of FIG.
Is formed by cutting out the combustion wick 6 to form a groove-shaped space between the wick holders 72.

The structure of the combustion part 63, the suction part 62, and the ventilation passage 29 of the combustion wick 6 is the same as that of the fourth embodiment.

The combustion core 6 has a combustion portion 63 made of a porous ceramic sintered body and an upper absorption portion 62a and a lower absorption portion 62b made of a sintered body of polyethylene powder formed into a round bar shape. The upper suction part 62a and the lower suction part 62b are formed such that the side edges are removed in a cross-sectionally omitted state (see FIG. 5), and the ventilation path 29 is formed between the upper suction part 62a and the inner peripheral surface of the cylindrical core holder 72. The characteristics are the same as those of the above-described embodiment.

<Twelfth Embodiment> FIG. 17 shows the essential structure of a lighter according to this embodiment.
This embodiment is the same as the second embodiment.

In the closing cap 16 of this embodiment, a sealing member 18 is provided at a closed end which forms a closed space S which can open and close the combustion portion 61 of the combustion wick 6 together with the protrusion of the wick holder 7 in the first embodiment. It is formed similarly to the form.

The closing cap 16 is provided with an air passage closing portion 35 facing the opening of the air passage 20 separately.
Is provided, and the outer opening of the ventilation path 20 is opened and closed directly with the opening and closing operation of the closing cap 16. Others are first
This is the same as the embodiment.

<Thirteenth Embodiment> The essential structure of the lighter of this embodiment is shown in FIG. 18, which shows another example of the interlocking opening / closing structure of the air passage 20 accompanying the opening / closing operation of the closing cap 16.

A ventilation passage closing portion 37 with a valve for opening and closing the ventilation passage 20 is formed at the outside opening of the ventilation passage 20 formed through the upper lid 4.
The ventilation path closing portion 37 is urged in the closing direction by a spring 38.

On the other hand, the closing cap 16 is provided with a pressing projection 36 capable of pressing the ventilation path closing section 37, and is provided so as to interlock and close the ventilation path closing section 37 when the closing cap 16 is closed.

<Experimental Example> Here, a lighter as the present invention in the form of the first embodiment and a lighter having the same configuration except that no air passage was formed for comparison were used for ventilation. An experimental example confirming the effect of forming a road is shown.

(1) Flame length change measurement test during continuous combustion After igniting the burner wick of a lighter having variously formed air passages, the flame length change during continuous burning for 120 seconds was measured.
The result is shown in FIG. FIG. 19A shows that the air passage diameter is 0.
mm, that is, a comparative example writer without a ventilation path, FIG. 19B shows a ventilation path diameter of 0.5 mm, and FIG.
Has an air passage diameter of 1.0 mm, and FIG.
It is the measurement result by the present invention lighter of 0 mm.

In the measurement of FIG. 19, FIG. 20 shows the value of the flame length immediately after ignition in relation to the diameter of the ventilation path. According to this, the flame length immediately after ignition was 15 mm in the comparative example lighter having no air passage, whereas it was 20 mm in the lighter of the present invention having the air passage.

Similarly, FIG. 21 shows the time required for the flame length to reach 25 mm in relation to the diameter of the ventilation path. According to this, the time required for the flame length to reach 25 mm takes 20 seconds for the writer of the comparative example, while it takes 5 seconds for the writer of the present invention.

FIG. 22 similarly shows the value of the flame length when the flame is stabilized in relation to the ventilation path. According to this, the flame length is equilibrated when burned for about 20 to 30 seconds after ignition, and the flame length at this time is 25 mm in the comparative example lighter having no ventilation path. Gave a flame length of 40 mm.

To explain the above results, in FIG. 19, the change in flame length in continuous combustion up to 120 seconds is measured, but as a lighter, immediately after ignition or about 10 to 20 seconds after ignition. The flame length within the time period is important for practical use. From this point, it can be seen from FIGS. 20 and 21 that the flame length immediately after ignition is short if there is no ventilation path, and the flame length is reduced by providing the ventilation path. Longer, and
Even when the diameter of the air passage was changed to 0.5 to 2.0 mm, similar results were obtained. In addition, the flame length elongates with the passage of time after ignition, and reaches an equilibrium state at a certain flame length. Regarding the degree of elongation of the flame length, the flame length is quickly increased by providing a ventilation path, which is suitable for use. State.

Further, according to FIG. 22, the flame length in the equilibrium state after a certain amount of combustion time has elapsed is significantly longer than that without the air passage. In other words, even if the amount of protrusion of the combustion part of the combustion wick is the same, the maximum flame length can be increased by forming the ventilation path.
The protrusion amount of the combustion wick can be reduced. The fact that the amount of protrusion can be reduced allows the size of the sealed portion of the closing cap for preventing the wick of the combustion wick from evaporating to be reduced, and the size can be reduced.

(2) Liquid Fuel Leakage Test In this test, the presence or absence of leakage of liquid fuel from the combustion wick when the outside air temperature was changed was observed. The results are shown in Table 1. Similarly, the external pressure is set to ±
It is an observation of the presence or absence of leakage of the liquid fuel from the combustion wick when changing by 20%. The results are shown in Table 2.

As a result, when the outside air temperature rises,
And when the outside air pressure decreases, in the comparative example lighter without a ventilation path, the internal pressure of the fuel tank becomes relatively higher than the external pressure, and the phenomenon that the liquid fuel leaks out of the combustion wick has occurred. In the lighter of the present invention, such a phenomenon did not occur due to the elimination of the pressure difference.

[0088]

[Table 1]

[0089]

[Table 2]

According to the above-described embodiments of the present invention, in a combustion device using a liquid fuel, particularly in an igniter such as a lighter for the purpose of igniting, the flame length is made as long as possible after ignition and the ignition is ignited. In order to increase the extension speed of the subsequent flame length, by providing a ventilation path communicating the inside of the fuel tank with the outside air along the fuel path by the combustion wick, better results can be obtained compared to those without a ventilation path Was completed. Also, the length of the combustion wick for obtaining the same flame length can be shortened, and the length of the closing cap for sealing to prevent the fuel from volatilizing when not in use can be shortened. In addition, the equipment design is simplified, and at the same time, by providing an air passage in this sealed portion, the liquid fuel is prevented from volatilizing from the air passage, and the liquid fuel is prevented from being blown out when the ambient temperature or the ambient pressure changes. I was able to.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a lighter as an example of a liquid fuel combustion device according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a lighter according to a second embodiment.

FIG. 3 is a sectional view of a main part of a lighter according to a third embodiment.

FIG. 4 is a sectional view of a main part of a lighter according to a fourth embodiment.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view of a main part of a lighter according to a fifth embodiment.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a sectional view of a main part of a lighter according to a sixth embodiment.

9 is a sectional view taken along the line CC in FIG.

FIG. 10 is a sectional view of a main part of a lighter according to a seventh embodiment.

11 is a sectional view taken along line DD of FIG.

FIG. 12 is a sectional view of a main part of a lighter according to an eighth embodiment.

FIG. 13 is a sectional view of a main part of a writer according to a ninth embodiment;

14 is a sectional view taken along line EE of FIG.

FIG. 15 is a sectional view of a main part of a lighter according to a tenth embodiment.

FIG. 16 is a sectional view of a main part of a lighter according to an eleventh embodiment.

FIG. 17 is a sectional view of a main part of a lighter according to a twelfth embodiment.

FIG. 18 is a sectional view of a main part of a writer according to a thirteenth embodiment.

FIG. 19 is a graph showing the relationship between the burning time after ignition and the flame length for each diameter of the ventilation path.

FIG. 20 is a graph showing the relationship between the flame length immediately after ignition and the diameter of the ventilation path.

FIG. 21 is a graph showing the relationship between the time when the flame length reaches 25 mm and the diameter of the ventilation path.

FIG. 22 is a graph showing the relationship between the flame length and the air passage diameter when the flame length is stable.

[Description of Signs] 1 Lighter (combustion device for liquid combustion) 2 Fuel tank 4 Upper lid 4a Screw hole 6 Burning core 61,63 Burning part 62 Suction part 7,71,72 Core holder 7a Joining screw 8 Seal ring 10 Ignition member 16 Blocking cap S Sealed space 18 Sealing member 19 Sealing member 20-29 Vent 31 O-ring 32 Porous pipe 33 Seal ring 34 Spring 35,37 Vent closing part 36 Pressing protrusion

Claims (9)

[Claims] 1. A liquid fuel combustor having a wick for sucking up and burning liquid fuel contained in a fuel tank by capillary action, wherein at least parts of the fuel tank and the outside air at the time of combustion are provided in portions other than the fuel passage by the wick. A combustion device for a liquid fuel, wherein a communicating passage is provided. 2. A wick for sucking and burning liquid fuel contained in a fuel tank by a capillary phenomenon, wherein the wick is divided, and at least one of the divided parts is provided so as to be capable of moving toward and away from the other, and At the time of contact, the fuel is supplied from one side to the other, and the fuel supply for liquid fuel is provided so as to limit the combustion time by cutting off the fuel supply with separation. A combustion device for a liquid fuel, comprising a ventilation passage communicating between the inside of a fuel tank and outside air. 3. A closed cap for volatilization prevention which seals a burning portion of the wick so as to be openable and closable so that an opening of the air passage to the outside air communicates with a closed space of the closed cap in a closed state. The combustion device for a liquid fuel according to claim 1, wherein the combustion device is formed in a shape. 4. A closing cap for volatilization prevention, which seals a burning portion of the wick so as to be openable and closable, wherein an opening of the ventilation path to the outside air is closed by a closed end of the closing cap in a closed state. 3. The device according to claim 1, wherein
3. The combustion device for liquid fuel according to claim 1. 5. A ventilating block which is attached to or interlocks with a volatilization-preventing closing cap for opening and closing the burning portion of the wick so that the burning portion of the wick can be opened and closed. 3. The combustion device for liquid fuel according to claim 1, wherein an opening of the ventilation path to the outside air is opened and closed. 6. The air passage according to claim 1, wherein the air passage is formed by a gap formed between the core holder and an outer periphery of the core or a groove formed in an inner periphery of the core holder. Combustion equipment for liquid fuel. 7. The combustion apparatus for liquid fuel according to claim 1, wherein the ventilation path is constituted by a pore pipe arranged along a core. 8. The liquid fuel combustion device according to claim 1, wherein the ventilation path is formed by a groove formed in a core. 9. A sealed fuel tank containing a fibrous material and impregnating and storing the liquid fuel so that it cannot be re-injected, and a suction part inserted at one end into the fuel tank to come in contact with the fibrous material and capillary the liquid fuel. A wick protruding above the fuel tank with the other end burning part held by the wick holder and sucked by the phenomenon; a closing cap for opening and closing at least the burning part of the wick via a seal member; and a burning part of the wick A igniting member disposed adjacent to the fuel cell and igniting the combustion portion; and a ventilation path that allows the inside and outside of the fuel tank to ventilate through a portion other than the fuel passage by the wick. Combustion equipment for liquid fuel.